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Test host_regexp against all PTR records instead of only one

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Arthur Passos 2022-06-02 22:54:14 -03:00
parent 225c47a457
commit d66154e697
45 changed files with 9309 additions and 26 deletions
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6
.gitmodules vendored
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@ -274,3 +274,9 @@
[submodule "contrib/base-x"]
path = contrib/base-x
url = https://github.com/ClickHouse/base-x.git
[submodule "contrib/cpp-dns"]
path = contrib/cpp-dns
url = git@github.com:YukiWorkshop/cpp-dns.git
[submodule "contrib/udns"]
path = contrib/udns
url = https://github.com/arthurpassos/udns.git

2
contrib/CMakeLists.txt vendored
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@ -156,6 +156,8 @@ endif()
add_contrib (sqlite-cmake sqlite-amalgamation)
add_contrib (s2geometry-cmake s2geometry)
add_contrib (base-x-cmake base-x)
add_contrib (udns-cmake udns)
add_contrib (cpp-dns-cmake cpp-dns)
# Put all targets defined here and in subdirectories under "contrib/<immediate-subdir>" folders in GUI-based IDEs.
# Some of third-party projects may override CMAKE_FOLDER or FOLDER property of their targets, so they would not appear

1
contrib/cpp-dns vendored Submodule

@ -0,0 +1 @@
Subproject commit 0ce2dbd40dce456bde1732c4d8f70008f0079db0

31
contrib/cpp-dns-cmake/CMakeLists.txt Normal file
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set(LIBRARY_DIR "${ClickHouse_SOURCE_DIR}/contrib/cpp-dns")
# If not, ASIO standalone mode.
#find_path(LIBUDNS_INCLUDE_DIR
# NAME udns.h
# HINTS /opt/local/include)
#
#find_library(lib_udns udns
# PATHS /opt/local/lib)
#if (lib_udns)
# message("Found libudns!")
#else()
# message(FATAL_ERROR "udns not found")
#endif()
#find_package(Boost 1.78 COMPONENTS system REQUIRED)#[[]]
set(SRCS "${LIBRARY_DIR}/DNSResolver.cpp")
set(HDRS "${LIBRARY_DIR}/DNSResolver.hpp")
add_library(_cpp-dns ${SRCS} ${HDRS})
#message("Libraries: lb: ${LIBRARY_DIR} bid: ${Boost_INCLUDE_DIRS} bl: ${Boost_LIBRARIES} libudns: ${lib_udns}")
target_link_libraries(_cpp-dns boost::system boost::headers_only ch_contrib::udns)
target_include_directories(_cpp-dns SYSTEM BEFORE PUBLIC ${LIBRARY_DIR})
add_library(ch_contrib::cpp-dns ALIAS _cpp-dns)

54
contrib/udns-cmake/CMakeLists.txt Normal file
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set(LIBRARY_DIR "${ClickHouse_SOURCE_DIR}/contrib/udns")
#add_library(udns
# udns_dn.c
# udns_dntosp.c
# udns_parse.c
# udns_resolver.c
# udns_init.c
# udns_misc.c
# udns_XtoX.c
# udns_rr_a.c
# udns_rr_ptr.c
# udns_rr_mx.c
# udns_rr_txt.c
# udns_bl.c
# udns_rr_srv.c
# udns_rr_naptr.c
# udns_codes.c
# udns_jran.c
# )
#add_library(_udns
# "${LIBRARY_DIR}/udns_dn.c"
# "${LIBRARY_DIR}/dnsget.c" "${LIBRARY_DIR}/ex-rdns.c" "${LIBRARY_DIR}/getopt.c" "${LIBRARY_DIR}/inet_XtoX.c"
# "${LIBRARY_DIR}/rblcheck.c" "${LIBRARY_DIR}/udns_bl.c" "${LIBRARY_DIR}/udns_dntosp.c"
# "${LIBRARY_DIR}/udns_init.c" "${LIBRARY_DIR}/udns_jran.c" "${LIBRARY_DIR}/udns_misc.c" "${LIBRARY_DIR}/udns_parse.c"
# "${LIBRARY_DIR}/udns_resolver.c" "${LIBRARY_DIR}/udns_rr_a.c" "${LIBRARY_DIR}/udns_rr_mx.c"
# "${LIBRARY_DIR}/udns_rr_naptr.c" "${LIBRARY_DIR}/udns_rr_ptr.c" "${LIBRARY_DIR}/udns_rr_srv.c" "${LIBRARY_DIR}/udns_rr_txt.c"
# "${LIBRARY_DIR}/udns_XtoX.c" )
add_library(_udns
"${LIBRARY_DIR}/udns_dn.c"
"${LIBRARY_DIR}/udns_dntosp.c"
"${LIBRARY_DIR}/udns_parse.c"
"${LIBRARY_DIR}/udns_resolver.c"
"${LIBRARY_DIR}/udns_init.c"
"${LIBRARY_DIR}/udns_misc.c"
"${LIBRARY_DIR}/udns_XtoX.c"
"${LIBRARY_DIR}/udns_rr_a.c"
"${LIBRARY_DIR}/udns_rr_ptr.c"
"${LIBRARY_DIR}/udns_rr_mx.c"
"${LIBRARY_DIR}/udns_rr_txt.c"
"${LIBRARY_DIR}/udns_bl.c"
"${LIBRARY_DIR}/udns_rr_srv.c"
"${LIBRARY_DIR}/udns_rr_naptr.c"
"${LIBRARY_DIR}/udns_codes.c"
"${LIBRARY_DIR}/udns_jran.c"
)
target_compile_definitions(_udns PRIVATE -DHAVE_CONFIG_H)
target_include_directories(_udns SYSTEM BEFORE PUBLIC ${LIBRARY_DIR})
add_library(ch_contrib::udns ALIAS _udns)

502
contrib/udns/COPYING.LGPL Normal file
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@ -0,0 +1,502 @@
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197
contrib/udns/Makefile.in Normal file
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#! /usr/bin/make -rf
# Makefile.in
# libudns Makefile
#
# Copyright (C) 2005 Michael Tokarev <mjt@corpit.ru>
# This file is part of UDNS library, an async DNS stub resolver.
#
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#
# You should have received a copy of the GNU Lesser General Public
# License along with this library, in file named COPYING.LGPL; if not,
# write to the Free Software Foundation, Inc., 59 Temple Place,
# Suite 330, Boston, MA 02111-1307 USA
NAME = udns
VERS = 0.4
SOVER = 0
SRCS = udns_dn.c udns_dntosp.c udns_parse.c udns_resolver.c udns_init.c \
udns_misc.c udns_XtoX.c \
udns_rr_a.c udns_rr_ptr.c udns_rr_mx.c udns_rr_txt.c udns_bl.c \
udns_rr_srv.c udns_rr_naptr.c udns_codes.c udns_jran.c
USRCS = dnsget.c rblcheck.c ex-rdns.c
DIST = COPYING.LGPL udns.h udns.3 dnsget.1 rblcheck.1 $(SRCS) $(USRCS) \
NEWS TODO NOTES Makefile.in configure configure.lib \
inet_XtoX.c getopt.c
OBJS = $(SRCS:.c=.o) $(GEN:.c=.o)
LIB = lib$(NAME).a
LIBFL = -L. -l$(NAME)
SOBJS = $(OBJS:.o=.lo)
SOLIB = lib$(NAME)_s.so
SOLIBV = lib$(NAME).so.$(SOVER)
SOLIBFL= -L. -l$(NAME)_s
UTILS = $(USRCS:.c=)
UOBJS = $(USRCS:.c=.o)
SOUTILS = $(USRCS:.c=_s)
NAMEPFX = $(NAME)-$(VERS)
CC = @CC@
CFLAGS = @CFLAGS@
CDEFS = @CDEFS@
LD = @LD@
LDFLAGS = @LDFLAGS@
LIBS = @LIBS@
LDSHARED = $(LD) -shared
PICFLAGS = -fPIC
AWK = awk
TAR = tar
all: static
.SUFFIXES: .c .o .lo
static: $(LIB) $(UTILS)
staticlib: $(LIB)
$(LIB): $(OBJS)
-rm -f $@
$(AR) rv $@ $(OBJS)
.c.o:
$(CC) $(CFLAGS) $(CDEFS) -c $<
shared: $(SOLIBV) $(SOUTILS)
sharedlib: $(SOLIBV)
$(SOLIBV): $(SOBJS)
$(LDSHARED) -Wl,--soname,$(SOLIBV) -o $@ $(SOBJS) $(LDFLAGS) $(LIBS)
$(SOLIB): $(SOLIBV)
rm -f $@
ln -s $(SOLIBV) $@
.c.lo:
$(CC) $(CFLAGS) $(PICFLAGS) $(CDEFS) -o $@ -c $<
# udns_codes.c is generated from udns.h
udns_codes.c: udns.h
@echo Generating $@
@set -e; exec >$@.tmp; \
set T type C class R rcode; \
echo "/* Automatically generated. */"; \
echo "#include \"udns.h\""; \
while [ "$$1" ]; do \
echo; \
echo "const struct dns_nameval dns_$${2}tab[] = {"; \
$(AWK) "/^ DNS_$${1}_[A-Z0-9_]+[ ]*=/ \
{ printf \" {%s,\\\"%s\\\"},\\n\", \$$1, substr(\$$1,7) }" \
udns.h ; \
echo " {0,0}};"; \
echo "const char *dns_$${2}name(enum dns_$${2} code) {"; \
echo " static char nm[20];"; \
echo " switch(code) {"; \
$(AWK) "BEGIN{i=0} \
/^ DNS_$${1}_[A-Z0-9_]+[ ]*=/ \
{printf \" case %s: return dns_$${2}tab[%d].name;\\n\",\$$1,i++}\
" udns.h ; \
echo " }"; \
echo " return _dns_format_code(nm,\"$$2\",code);"; \
echo "}"; \
shift 2; \
done
@mv $@.tmp $@
udns.3.html: udns.3
groff -man -Thtml udns.3 > $@.tmp
mv $@.tmp $@
dist: $(NAMEPFX).tar.gz
$(NAMEPFX).tar.gz: $(DIST)
$(TAR) -cv -f $@ -z --transform 's|^|$(NAMEPFX)/|' $(DIST)
subdist:
cp -p $(DIST) $(TARGET)/
clean:
rm -f $(OBJS)
rm -f $(SOBJS)
rm -f $(UOBJS)
rm -f config.log
distclean: clean
rm -f $(LIB) $(SOLIB) $(SOLIBV) udns.3.html
rm -f $(UTILS) $(SOUTILS)
rm -f config.status config.h Makefile
Makefile: configure configure.lib Makefile.in
./configure
@echo
@echo Please rerun make >&2
@exit 1
.PHONY: all static staticlib shared sharedlib dist clean distclean subdist \
depend dep deps
depend dep deps: $(SRCS) $(USRC)
@echo Generating deps for:
@echo \ $(SRCS)
@echo \ $(USRCS)
@sed '/^# depend/q' Makefile.in > Makefile.tmp
@set -e; \
for f in $(SRCS) $(USRCS); do \
echo $${f%.c}.o $${f%.c}.lo: $$f \
`sed -n 's/^#[ ]*include[ ]*"\(.*\)".*/\1/p' $$f`; \
done >> Makefile.tmp; \
for f in $(USRCS:.c=.o); do \
echo "$${f%.?}: $$f \$$(LIB)"; \
echo " \$$(LD) \$$(LDLAGS) -o \$$@ $$f \$$(LIBFL) \$$(LIBS)"; \
echo "$${f%.?}_s: $$f \$$(SOLIB)"; \
echo " \$$(LD) \$$(LDFLAGS) -o \$$@ $$f \$$(SOLIBFL)"; \
done >> Makefile.tmp ; \
if cmp Makefile.tmp Makefile.in >/dev/null 2>&1 ; then \
echo Makefile.in unchanged; rm -f Makefile.tmp; \
else \
echo Updating Makfile.in; mv -f Makefile.tmp Makefile.in ; \
fi
# depend
udns_dn.o udns_dn.lo: udns_dn.c udns.h
udns_dntosp.o udns_dntosp.lo: udns_dntosp.c udns.h
udns_parse.o udns_parse.lo: udns_parse.c udns.h
udns_resolver.o udns_resolver.lo: udns_resolver.c config.h udns.h
udns_init.o udns_init.lo: udns_init.c config.h udns.h
udns_misc.o udns_misc.lo: udns_misc.c udns.h
udns_XtoX.o udns_XtoX.lo: udns_XtoX.c config.h udns.h inet_XtoX.c
udns_rr_a.o udns_rr_a.lo: udns_rr_a.c udns.h
udns_rr_ptr.o udns_rr_ptr.lo: udns_rr_ptr.c udns.h
udns_rr_mx.o udns_rr_mx.lo: udns_rr_mx.c udns.h
udns_rr_txt.o udns_rr_txt.lo: udns_rr_txt.c udns.h
udns_bl.o udns_bl.lo: udns_bl.c udns.h
udns_rr_srv.o udns_rr_srv.lo: udns_rr_srv.c udns.h
udns_rr_naptr.o udns_rr_naptr.lo: udns_rr_naptr.c udns.h
udns_codes.o udns_codes.lo: udns_codes.c udns.h
udns_jran.o udns_jran.lo: udns_jran.c udns.h
dnsget.o dnsget.lo: dnsget.c config.h udns.h getopt.c
rblcheck.o rblcheck.lo: rblcheck.c config.h udns.h getopt.c
ex-rdns.o ex-rdns.lo: ex-rdns.c udns.h
dnsget: dnsget.o $(LIB)
$(LD) $(LDLAGS) -o $@ dnsget.o $(LIBFL) $(LIBS)
dnsget_s: dnsget.o $(SOLIB)
$(LD) $(LDFLAGS) -o $@ dnsget.o $(SOLIBFL)
rblcheck: rblcheck.o $(LIB)
$(LD) $(LDLAGS) -o $@ rblcheck.o $(LIBFL) $(LIBS)
rblcheck_s: rblcheck.o $(SOLIB)
$(LD) $(LDFLAGS) -o $@ rblcheck.o $(SOLIBFL)
ex-rdns: ex-rdns.o $(LIB)
$(LD) $(LDLAGS) -o $@ ex-rdns.o $(LIBFL) $(LIBS)
ex-rdns_s: ex-rdns.o $(SOLIB)
$(LD) $(LDFLAGS) -o $@ ex-rdns.o $(SOLIBFL)

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NEWS
User-visible changes in udns library. Recent changes on top.
0.4 (Jan 2014)
- bugfix: fix a bug in new list code introduced in 0.3
- portability: use $(LD)/$(LDFLAGS)/$(LIBS)
0.3 (Jan 2014)
- bugfix: refactor double-linked list implementation in udns_resolver.c
(internal to the library) to be more strict-aliasing-friendly, because
old code were miscompiled by gcc.
- bugfix: forgotten strdup() in rblcheck
0.2 (Dec 2011)
- bugfix: SRV RR handling: fix domain name parsing and crash in case
if no port is specified on input for SRV record query
- (trivial api) dns_set_opts() now returns number of unrecognized
options instead of always returning 0
- dnsget: combine -f and -o options in dnsget (and stop documenting -f),
and report unknown/invalid -o options (and error out)
- dnsget: pretty-print SSHFP RRs
0.1 (Dec 2010)
- bugfix: udns_new(old) - when actually cloning another context -
makes the new context referencing memory from old, which leads
to crashes when old is modified later
- use random queue IDs (the 16bit qID) in queries instead of sequentional
ones, based on simple pseudo-random RNG by Bob Jenkins (udns_jran.[ch]).
Some people believe that this improves security (CVE-2008-1447). I'm
still not convinced (see comments in udns_resolver.c), but it isn't
difficult to add after all.
- deprecate dns_random16() function which was declared in udns.h
(not anymore) but never documented. In order to keep ABI compatible
it is still exported.
- library has a way now to set query flags (DNS_SET_DO; DNS_SET_CD).
- dnsget now prints non-printable chars in all strings in DNS RRs using
decimal escape sequences (\%03u) instead of hexadecimal (\%02x) when
before - other DNS software does it like this.
- recognize a few more record types in dnsget, notable some DNSSEC RRs;
add -f option for dnsget to set query flags.
- udns is not a Debian native package anymore (was a wrong idea)
0.0.9 (16 Jan 2007)
- incompat: minor API changes in dns_init() &friends. dns_init()
now requires extra `struct dns_ctx *' argument. Not bumped
soversion yet - I only expect one "release" with this change.
- many small bugfixes, here and there
- more robust FORMERR replies handling - not only such replies are now
recognized, but udns retries queries without EDNS0 extensions if tried
with, but server reported FORMERR
- portability changes, udns now includes getopt() implementation fo
the systems lacking it (mostly windows), and dns_ntop()&dns_pton(),
which are either just wrappers for system functions or reimplementations.
- build is now based on autoconf-like configuration
- NAPTR (RFC3403) RR decoding support
- new file NOTES which complements TODO somewhat, and includes some
important shortcomings
- many internal cleanups, including some preparations for better error
recovery, security and robustness (and thus API changes)
- removed some #defines which are now unused (like DNS_MAXSRCH)
- changed WIN32 to WINDOWS everywhere in preprocessor tests,
to be able to build it on win64 as well
0.0.8 (12 Sep 2005)
- added SRV records (rfc2782) parsing,
thanks to Thadeu Lima de Souza Cascardo for implementation.
- bugfixes:
o use uninitialized value when no reply, library died with assertion:
assert((status < 0 && result == 0) || (status >= 0 && result != 0)).
o on some OSes, struct sockaddr_in has additional fields, so
memcmp'ing two sockaddresses does not work.
- rblcheck(.1)
0.0.7 (20 Apr 2005)
- dnsget.1 manpage and several enhancements to dnsget.
- allow nameserver names for -n option of dnsget.
- API change: all dns_submit*() routines now does not expect
last `now' argument, since requests aren't sent immediately
anymore.
- API change: different application timer callback mechanism.
Udns now uses single per-context timer instead of per-query.
- don't assume DNS replies only contain backward DN pointers,
allow forward pointers too. Change parsing API.
- debianize
0.0.6 (08 Apr 2005)
- use double sorted list for requests (sorted by deadline).
This should significantly speed up timeout processing for
large number of requests.
- changed debugging interface, so it is finally useable
(still not documented).
- dnsget routine is now Officially Useable, and sometimes
even more useable than `host' from BIND distribution
(and sometimes not - dnsget does not have -C option
and TCP mode)
- Debian packaging in debian/ -- udns is now maintained as a
native Debian package.
- alot (and I really mean alot) of code cleanups all over.

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Assorted notes about udns (library).
UDP-only mode
~~~~~~~~~~~~~
First of all, since udns is (currently) UDP-only, there are some
shortcomings.
It assumes that a reply will fit into a UDP buffer. With adoption of EDNS0,
and general robustness of IP stacks, in most cases it's not an issue. But
in some cases there may be problems:
- if an RRset is "very large" so it does not fit even in buffer of size
requested by the library (current default is 4096; some servers limits
it further), we will not see the reply, or will only see "damaged"
reply (depending on the server).
- many DNS servers ignores EDNS0 option requests. In this case, no matter
which buffer size udns library will request, such servers reply is limited
to 512 bytes (standard pre-EDNS0 DNS packet size). (Udns falls back to
non-EDNO0 query if EDNS0-enabled one received FORMERR or NOTIMPL error).
The problem is that with this, udns currently will not consider replies with
TC (truncation) bit set, and will treat such replies the same way as it
treats SERVFAIL replies, thus trying next server, or temp-failing the query
if no more servers to try. In other words, if the reply is really large, or
if the servers you're using don't support EDNS0, your application will be
unable to resolve a given name.
Yet it's not common situation - in practice, it's very rare.
Implementing TCP mode isn't difficult, but it complicates API significantly.
Currently udns uses only single UDP socket (or - maybe in the future - two,
see below), but in case of TCP, it will need to open and close sockets for
TCP connections left and right, and that have to be integrated into an
application's event loop in an easy and efficient way. Plus all the
timeouts - different for connect(), write, and several stages of read.
IPv6 vs IPv4 usage
~~~~~~~~~~~~~~~~~~
This is only relevant for nameservers reachable over IPv6, NOT for IPv6
queries. I.e., if you've IPv6 addresses in 'nameservers' line in your
/etc/resolv.conf file. Even more: if you have BOTH IPv6 AND IPv4 addresses
there. Or pass them to udns initialization routines.
Since udns uses a single UDP socket to communicate with all nameservers,
it should support both v4 and v6 communications. Most current platforms
supports this mode - using PF_INET6 socket and V4MAPPED addresses, i.e,
"tunnelling" IPv4 inside IPv6. But not all systems supports this. And
more, it has been said that such mode is deprecated.
So, list only IPv4 or only IPv6 addresses, but don't mix them, in your
/etc/resolv.conf.
An alternative is to use two sockets instead of 1 - one for IPv6 and one
for IPv4. For now I'm not sure if it's worth the complexity - again, of
the API, not the library itself (but this will not simplify library either).
Single socket for all queries
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Using single UDP socket for sending queries to all nameservers has obvious
advantages. First it's, again, trivial, simple to use API. And simple
library too. Also, after sending queries to all nameservers (in case first
didn't reply in time), we will be able to receive late reply from first
nameserver and accept it.
But this mode has disadvantages too. Most important is that it's much easier
to send fake reply to us, as the UDP port where we expects the reply to come
to is constant during the whole lifetime of an application. More secure
implementations uses random port for every single query. While port number
(16 bits integer) can not hold much randomness, it's still of some help.
Ok, udns is a stub resolver, so it expects sorta friendly environment, but
on LAN it's usually much easier to fire an attack, due to the speed of local
network, where a bad guy can generate alot of packets in a short time.
Spoofing of replies (Kaminsky attack, CVE-2008-1447)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
While udns uses random numbers for query IDs, it uses single UDP port for
all queries (see previous item). And even if it used random UDP port for
each query, the attack described in CVE-2008-1447 is still quite trivial.
This is not specific to udns library unfortunately - it is inherent property
of the protocol. Udns is designed to work in a LAN, it needs full recursive
resolver nearby, and modern LAN usually uses high-bandwidth equipment which
makes the Kaminsky attack trivial. The problem is that even with qID (16
bits) and random UDP port (about 20 bits available to a regular process)
combined still can not hold enough randomness, so on a fast network it is
still easy to flood the target with fake replies and hit the "right" reply
before real reply comes. So random qIDs don't add much protection anyway,
even if this feature is implemented in udns, and using all available
techniques wont solve it either.
See also long comment in udns_resolver.c, udns_newid().
Assumptions about RRs returned
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Currently udns processes records in the reply it received sequentially.
This means that order of the records is significant. For example, if
we asked for foo.bar A, but the server returned that foo.bar is a CNAME
(alias) for bar.baz, and bar.baz, in turn, has address 1.2.3.4, when
the CNAME should come first in reply, followed by A. While DNS specs
does not say anything about order of records - it's an rrSET - unordered, -
I think an implementation which returns the records in "wrong" order is
somewhat insane...
CNAME recursion
~~~~~~~~~~~~~~~
Another interesting point is the handling of CNAMEs returned as replies
to non-CNAME queries. If we asked for foo.bar A, but it's a CNAME, udns
expects BOTH the CNAME itself and the target DN to be present in the reply.
In other words, udns DOES NOT RECURSE CNAMES. If we asked for foo.bar A,
but only record in reply was that foo.bar is a CNAME for bar.baz, udns will
return no records to an application (NXDOMAIN). Strictly speaking, udns
should repeat the query asking for bar.baz A, and recurse. But since it's
stub resolver, recursive resolver should recurse for us instead.
It's not very difficult to implement, however. Probably with some (global?)
flag to en/dis-able the feature. Provided there's some demand for it.
To clarify: udns handles CNAME recursion in a single reply packet just fine.
Note also that standard gethostbyname() routine does not recurse in this
situation, too.
Error reporting
~~~~~~~~~~~~~~~
Too many places in the code (various failure paths) sets generic "TEMPFAIL"
error condition. For example, if no nameserver replied to our query, an
application will get generic TEMPFAIL, instead of something like TIMEDOUT.
This probably should be fixed, but most applications don't care about the
exact reasons of failure - 4 common cases are already too much:
- query returned some valid data
- NXDOMAIN
- valid domain but no data of requested type - =NXDOMAIN in most cases
- temporary error - this one sometimes (incorrectly!) treated as NXDOMAIN
by (naive) applications.
DNS isn't yes/no, it's at least 3 variants, temp err being the 3rd important
case! And adding more variations for the temp error case is complicating things
even more - again, from an application writer standpoint. For diagnostics,
such more specific error cases are of good help.
Planned API changes
~~~~~~~~~~~~~~~~~~~
At least one thing I want to change for some future version is a way how
queries are submitted and how replies are handled.
I want to made dns_query object to be owned by an application. So that instead
of udns library allocating it for the lifetime of query, it will be pre-
allocated by an application. This simplifies and enhances query submitting
interface, and complicates it a bit too, in simplest cases.
Currently, we have:
dns_submit_dn(dn, cls, typ, flags, parse, cbck, data)
dns_submit_p(name, cls, typ, flags, parse, cbck, data)
dns_submit_a4(ctx, name, flags, cbck, data)
and so on -- with many parameters missed for type-specific cases, but generic
cases being too complex for most common usage.
Instead, with dns_query being owned by an app, we will be able to separately
set up various parts of the query - domain name (various forms), type&class,
parser, flags, callback... and even change them at runtime. And we will also
be able to reuse query structures, instead of allocating/freeing them every
time. So the whole thing will look something like:
q = dns_alloc_query();
dns_submit(dns_q_flags(dns_q_a4(q, name, cbck), DNS_F_NOSRCH), data);
The idea is to have a set of functions accepting struct dns_query* and
returning it (so the calls can be "nested" like the above), to set up
relevant parts of the query - specific type of callback, conversion from
(type-specific) query parameters into a domain name (this is for type-
specific query initializers), and setting various flags and options and
type&class things.
One example where this is almost essential - if we want to support
per-query set of nameservers (which isn't at all useless: imagine a
high-volume mail server, were we want to direct DNSBL queries to a separate
set of nameservers, and rDNS queries to their own set and so on). Adding
another argument (set of nameservers to use) to EVERY query submitting
routine is.. insane. Especially since in 99% cases it will be set to
default NULL. But with such "nesting" of query initializers, it becomes
trivial.
This change (the way how queries gets submitted) will NOT break API/ABI
compatibility with old versions, since the new submitting API works in
parallel with current (and current will use the new one as building
blocks, instead of doing all work at once).
Another way to do the same is to manipulate query object right after a
query has been submitted, but before any events processing (during this
time, query object is allocated and initialized, but no actual network
packets were sent - it will happen on the next event processing). But
this way it become impossible to perform syncronous resolver calls, since
those calls hide query objects they use internally.
Speaking of replies handling - the planned change is to stop using dynamic
memory (malloc) inside the library. That is, instead of allocating a buffer
for a reply dynamically in a parsing routine (or memdup'ing the raw reply
packet if no parsing routine is specified), I want udns to return the packet
buffer it uses internally, and change parsing routines to expect a buffer
for result. When parsing, a routine will return true amount of memory it
will need to place the result, regardless of whenever it has enough room
or not, so that an application can (re)allocate properly sized buffer and
call a parsing routine again.
This, in theory, also can be done without breaking current API/ABI, but in
that case we'll again need a parallel set of routines (parsing included),
which makes the library more complicated with too many ways of doing the
same thing. Still, code reuse is at good level.
Another modification I plan to include is to have an ability to work in
terms of domain names (DNs) as used with on-wire DNS packets, not only
with asciiz representations of them. For this to work, the above two
changes (query submission and result passing) have to be completed first
(esp. the query submission part), so that it will be possible to specify
some additional query flags (for example) to request domain names instead
of the text strings, and to allow easy query submissions with either DNs
or text strings.

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# udns

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TODO
The following is mostly an internal, not user-visible stuff.
* rearrange an API to make dns_query object owned by application,
so that it'll look like this:
struct dns_query *q;
q = dns_query_alloc(ctx);
dns_query_set(q, options, domain_name, flags, ...);
dns_query_submit(ctx, q);
For more information see NOTES file, section "Planned API changes".
* allow NULL callbacks? Or provide separate resolver
context list of queries which are done but wich did not
have callback, and dns_pick() routine to retrieve results
from this query, i.e. allow non-callback usage? The
non-callback usage may be handy sometimes (any *good*
example?), but it will be difficult to provide type-safe
non-callback interface due to various RR-specific types
in use.
* DNS_OPT_FLAGS should be DNS_OPT_ADDFLAGS and DNS_OPT_SETFLAGS.
Currently one can't add a single flag bit but preserve
existing bits... at least not without retrieving all current
flags before, which isn't that bad anyway.
* dns_set_opts() may process flags too (such as aaonly etc)
* a way to disable $NSCACHEIP et al processing?
(with now separate dns_init() and dns_reset(), it has finer
control, but still no way to init from system files but ignore
environment variables and the like)
* initialize/open the context automatically, and be more
liberal about initialization in general?
* dns_init(ctx, do_open) - make the parameter opposite, aka
dns_init(ctx, skip_open) ?
* allow TCP queue?
* more accurate error reporting. Currently, udns always returns TEMPFAIL,
but don't specify why it happened (ENOMEM, timeout, etc).
* check the error value returned by recvfrom() and
sendto() and determine which errors to ignore.
* maybe merge dns_timeouts() and dns_ioevent(), to have
only one entry point for everything? For traditional
select-loop-based eventloop it may be easier, but for
callback-driven event loops the two should be separate.
Provide an option, or a single dns_events() entry point
for select-loop approach, or just call dns_ioevent()
from within dns_timeouts() (probably after renaming
it to be dns_events()) ?
* implement /etc/hosts lookup too, ala [c-]ares??
* sortlist support?

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#pragma once
/* automatically generated by configure. */
#define HAVE_GETOPT 1
#define HAVE_INET_PTON_NTOP 1
#define HAVE_IPv6 1
#define HAVE_POLL 1

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#! /bin/sh
# autoconf-style configuration script
#
set -e
name=udns
if [ -f udns.h -a -f udns_resolver.c ] ; then :
else
echo "configure: error: sources not found at `pwd`" >&2
exit 1
fi
options="ipv6"
for opt in $options; do
eval enable_$opt=
done
if [ -f config.status ]; then
. ./config.status
fi
enable() {
opt=`echo "$1" | sed 's/^--[^-]*-//'`
case "$opt" in
ipv6) ;;
*) echo "configure: unrecognized option \`$1'" >&2; exit 1;;
esac
eval enable_$opt=$2
}
while [ $# -gt 0 ]; do
case "$1" in
--disable-*|--without-*|--no-*) enable "$1" n;;
--enable-*|--with-*) enable "$1" y;;
--help | --hel | --he | --h | -help | -hel | -he | -h )
cat <<EOF
configure: configure $name package.
Usage: ./configure [options]
where options are:
--enable-option, --with-option --
enable the named option/feature
--disable-option, --without-option, --no-option --
disable the named option/feature
--help - print this help and exit
Optional features (all enabled by default if system supports a feature):
ipv6 - enable/disable IP version 6 (IPv6) support
EOF
exit 0
;;
*) echo "configure: unknown option \`$1'" >&2; exit 1 ;;
esac
shift
done
. ./configure.lib
ac_msg "configure"
ac_result "$name package"
ac_prog_c_compiler_v
ac_prog_ranlib_v
ac_ign ac_yesno "for getopt()" ac_have GETOPT ac_link <<EOF
#include <stdio.h>
extern int optind;
extern char *optarg;
extern int getopt(int, char **, char *);
int main(int argc, char **argv) {
getopt(argc, argv, "abc");
return optarg ? optind : 0;
}
EOF
if ac_library_find_v 'socket and connect' "" "-lsocket -lnsl" <<EOF
#include <sys/socket.h>
int main() { int socket_fd = socket(); connect(socket_fd); return 0; }
EOF
then :
else
ac_fatal "cannot find libraries needed for sockets"
fi
ac_ign \
ac_yesno "for inet_pton() && inet_ntop()" \
ac_have INET_PTON_NTOP \
ac_link <<EOF
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
int main() {
char buf[64];
long x = 0;
inet_pton(AF_INET, &x, buf);
return inet_ntop(AF_INET, &x, buf, sizeof(buf));
}
EOF
if ac_yesno "for socklen_t" ac_compile <<EOF
#include <sys/types.h>
#include <sys/socket.h>
int foo() { socklen_t len; len = 0; return len; }
EOF
then :
else
ac_define socklen_t int
fi
if [ n != "$enable_ipv6" ]; then
if ac_yesno "for IPv6" ac_have IPv6 ac_compile <<EOF
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
int main() {
struct sockaddr_in6 sa;
sa.sin6_family = AF_INET6;
return 0;
}
EOF
then :
elif [ "$enable_ipv6" ]; then
ac_fatal "IPv6 is requested but not available"
fi
fi # !disable_ipv6?
if ac_yesno "for poll()" ac_have POLL ac_link <<EOF
#include <sys/types.h>
#include <sys/poll.h>
int main() {
struct pollfd pfd[2];
return poll(pfd, 2, 10);
}
EOF
then :
else
ac_ign ac_yesno "for sys/select.h" ac_have SYS_SELECT_H ac_cpp <<EOF
#include <sys/types.h>
#include <sys/select.h>
EOF
fi
ac_config_h
ac_output Makefile
ac_msg "creating config.status"
rm -f config.status
{
echo "# automatically generated by configure to hold command-line options"
echo
found=
for opt in $options; do
eval val=\$enable_$opt
if [ -n "$val" ]; then
echo enable_$opt=$val
found=y
fi
done
if [ ! "$found" ]; then
echo "# (no options encountered)"
fi
} > config.status
ac_result ok
ac_result "all done."
exit 0

268
contrib/udns/configure.lib Normal file
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@ -0,0 +1,268 @@
# configure.lib
# a library of shell routines for simple autoconf system
#
set -e
ac_substitutes=
rm -f conftest* config.log
exec 5>config.log
cat <<EOF >&5
This file contains any messages produced by compilers etc while
running configure, to aid debugging if configure script makes a mistake.
EOF
case `echo "a\c"` in
*c*) ac_en=-n ac_ec= ;;
*) ac_en= ac_ec='\c' ;;
esac
##### Messages
ac_msg() {
echo $ac_en "$*... $ac_ec"
echo ">>> $*" >&5
}
ac_checking() {
echo $ac_en "checking $*... $ac_ec"
echo ">>> checking $*" >&5
}
ac_result() {
echo "$1"
echo "=== $1" >&5
}
ac_fatal() {
echo "configure: fatal: $*" >&2
echo "=== FATAL: $*" >&5
exit 1
}
ac_warning() {
echo "configure: warning: $*" >&2
echo "=== WARNING: $*" >&5
}
ac_ign() {
"$@" || :
}
# ac_run command...
# captures output in conftest.out
ac_run() {
# apparently UnixWare (for one) /bin/sh optimizes the following "if"
# "away", by checking if there's such a command BEFORE redirecting
# output. So error message (like "gcc: command not found") goes
# to stderr instead of to conftest.out, and `cat conftest.out' below
# fails.
if "$@" >conftest.out 2>&1; then
return 0
else
echo "==== Command invocation failed. Command line was:" >&5
echo "$*" >&5
echo "==== compiler input was:" >&5
cat conftest.c >&5
echo "==== output was:" >&5
cat conftest.out >&5
echo "====" >&5
return 1
fi
}
# common case for ac_verbose: yes/no result
ac_yesno() {
ac_checking "$1"
shift
if "$@"; then
ac_result yes
return 0
else
ac_result no
return 1
fi
}
ac_subst() {
ac_substitutes="$ac_substitutes $*"
}
ac_define() {
CDEFS="$CDEFS -D$1=${2:-1}"
}
ac_have() {
ac_what=$1; shift
if "$@"; then
ac_define HAVE_$ac_what
eval ac_have_$ac_what=yes
return 0
else
eval ac_have_$ac_what=no
return 1
fi
}
##### Compiling, linking
# run a compiler
ac_run_compiler() {
rm -f conftest*; cat >conftest.c
ac_run $CC $CFLAGS $CDEFS "$@" conftest.c
}
ac_compile() {
ac_run_compiler -c
}
ac_link() {
ac_run_compiler -o conftest $LIBS "$@"
}
ac_cpp() {
ac_run_compiler -E "$@"
}
### check for C compiler. Set $CC, $CFLAGS etc
ac_prog_c_compiler_v() {
ac_checking "for C compiler"
rm -f conftest*
echo 'int main(int argc, char **argv) { return 0; }' >conftest.c
if [ -n "$CC" ]; then
if ac_run $CC -o conftest conftest.c && ac_run ./conftest; then
ac_result "\$CC ($CC)"
else
ac_result no
ac_fatal "\$CC ($CC) is not a working compiler"
fi
else
for cc in gcc cc ; do
if ac_run $cc -o conftest conftest.c && ac_run ./conftest; then
ac_result "$cc"
CC=$cc
break
fi
done
if [ -z "$CC" ]; then
ac_result no
ac_fatal "no working C compiler found in \$PATH. please set \$CC variable"
fi
fi
if [ -z "$CFLAGS" ]; then
if ac_yesno "whenever C compiler ($CC) is GNU CC" \
ac_grep_cpp yEs_mAsTeR <<EOF
#ifdef __GNUC__
yEs_mAsTeR;
#endif
EOF
then
CFLAGS="-Wall -W -O2 -pipe"
else
CFLAGS=-O
fi
fi
cc="$CC $CFLAGS"
ccld="$cc"
if [ -n "$LDFLAGS" ]; then ccld="$ccld $LDFLAGS"; fi
if [ -n "$LIBS" ]; then ccld="$ccld $LIBS"; fi
if ac_yesno "whenever the C compiler ($ccld)
can produce executables" \
ac_compile_run <<EOF
int main() { return 0; }
EOF
then :
else
ac_fatal "no working C compiler found"
fi
LD='$(CC)'
[ -n "$AR" ] || AR=ar
[ -n "$ARFLAGS" ] || ARFLAGS=rv
[ -n "$AWK" ] || AWK=awk
ac_substitutes="$ac_substitutes CC CFLAGS CDEFS LD LDFLAGS LIBS AR ARFLAGS AWK"
}
ac_prog_ranlib_v() {
ac_checking "for ranlib"
if [ -n "$RANLIB" ]; then
ac_result "\$RANLIB ($RANLIB)"
else
ifs="$IFS"
IFS=:
for dir in $PATH; do
[ -n "$dir" ] || dir=.
if [ -f $dir/ranlib ]; then
RANLIB=ranlib
break
fi
done
IFS="$ifs"
if [ -z "$RANLIB" ]; then ac_result no; RANLIB=:
else ac_result "$RANLIB"
fi
fi
ac_substitutes="$ac_substitutes RANLIB"
}
ac_library_find_v() {
ac_checking "for libraries needed for $1"
shift
fond=
rm -f conftest*; cat >conftest.c
for lib in "$@"; do
if ac_run $CC $CFLAGS $LDFLAGS conftest.c -o conftest $LIBS $lib; then
found=y
break
fi
done
if [ ! "$found" ]; then
ac_result "not found"
return 1
fi
if [ -z "$lib" ]; then
ac_result "ok (none needed)"
else
ac_result "ok ($lib)"
LIBS="$LIBS $lib"
fi
}
ac_compile_run() {
ac_link "$@" && ac_run ./conftest
}
ac_grep_cpp() {
pattern="$1"; shift
ac_cpp "$@" && grep "$pattern" conftest.out >/dev/null
}
ac_output() {
for var in $ac_substitutes; do
eval echo "\"s|@$var@|\$$var|\""
done >conftest.sed
for file in "$@"; do
ac_msg "creating $file"
if [ -f $file.in ]; then
sed -f conftest.sed $file.in > $file.tmp
mv -f $file.tmp $file
ac_result ok
else
ac_result failed
ac_fatal "$file.in not found"
fi
done
rm -f conftest*
}
ac_config_h() {
h=${1:-config.h}
ac_msg "creating $h"
rm -f $1.tmp
echo "/* automatically generated by configure. */" > $h.tmp
echo "$CDEFS" | tr ' ' '
' | sed -e 's/^-D/#define /' -e 's/=/ /' >> $h.tmp
if [ -f $h ] && cmp -s $h.tmp $h ; then
rm -f $h.tmp
ac_result unchanged
else
mv -f $h.tmp $h
ac_result ok
fi
CDEFS=-DHAVE_CONFIG_H
}

3
contrib/udns/conftest.c Normal file
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@ -0,0 +1,3 @@
#include <sys/socket.h>
int main() { socket(); connect(); return 0; }

7
contrib/udns/conftest.out Normal file
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@ -0,0 +1,7 @@
conftest.c:1:14: error: implicit declaration of function 'socket' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
int main() { socket(); connect(); return 0; }
^
conftest.c:1:24: error: implicit declaration of function 'connect' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
int main() { socket(); connect(); return 0; }
^
2 errors generated.

195
contrib/udns/dnsget.1 Normal file
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@ -0,0 +1,195 @@
.\" dnsget.1: dnsget manpage
.\"
.\" Copyright (C) 2005-2014 Michael Tokarev <mjt+udns@tls.msk.ru>
.\" This file is part of UDNS library, an async DNS stub resolver.
.\"
.\" This library is free software; you can redistribute it and/or
.\" modify it under the terms of the GNU Lesser General Public
.\" License as published by the Free Software Foundation; either
.\" version 2.1 of the License, or (at your option) any later version.
.\"
.\" This library is distributed in the hope that it will be useful,
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
.\" Lesser General Public License for more details.
.\"
.\" You should have received a copy of the GNU Lesser General Public
.\" License along with this library, in file named COPYING.LGPL; if not,
.\" write to the Free Software Foundation, Inc., 59 Temple Place,
.\" Suite 330, Boston, MA 02111-1307 USA
.TH dnsget 1 "Jan 2014" "User Utilities"
.SH NAME
dnsget \- DNS lookup utility
.SH SYNOPSYS
.B dnsget
.RB [\| \-v \||\| \-q \|]
.RB [\| \-c
.IR class \|]
.RB [\| \-t
.IR type \|]
.RB [\| \-o
.IR opt , opt ,...]
.IR name \|.\|.\|.
.SH DESCRIPTION
.B dnsget
is a simple command-line to perform DNS lookups, similar to
.BR host (1)
and
.BR dig (1).
It is useable for both interactive/debugging scenarious and
in scripts.
The program is implemented using
.BR udns (3)
library.
.PP
By default,
.B dnsget
produces a human-readable output, similar to
.RS
.nf
alias.example.com. CNAME www.example.com.
www.example.com. A 192.168.1.1
www.example.com. MX 10 mx.example.com.
.fi
.RE
which is just sufficient to see how a given name resolves.
Output format is controllable with
.B \-v
and
.B \-q
options -- the former increases verbosity level up to printing
the whole DNS contents of all packets sent and received, which
is suitable for debugging DNS problems, while the latter reduces
the level, making output more quiet, up to bare result with no
error messages, which is good for scripts.
.SH OPTIONS
The following options are recognized by
.BR dnsget :
.TP
.B \-v
produce more detailed output. More
.BR \-v 's
means more details will be produced. With single
.BR \-v , dnsget
will print contents of all received DNS packets (in a readable format),
while with
.BR \-vv ,
it will output all outgoing DNS packets too.
.TP
.B \-q
the opposite for \fB\-v\fR -- produce less detailed output.
With single
.BR \-q , dnsget
will only show (decoded) data from final DNS resource records (RR),
while
.B \-qq
also suppresses error messages.
.TP
\fB\-t \fItype\fR
request record(s) of the given type \fItype\fR. By default,
.B dnsget
will ask for IPv4 address (A) record, or for PTR record if the
argument in question is an IPv4 or IPv6 address. Recognized
types include A, AAAA, MX, TXT, CNAME, PTR, NS, SOA, ANY and
others.
.TP
\fB\-c \fIclass\fR
request DNS record(s) of the given class \fIclass\fR. By
default
.B dnsget
uses IN class. Valid classes include IN, CH, HS, ANY.
.TP
.B \-a
(compatibility option). Equivalent to setting query type to
.B ANY
and increasing verbosity level
.RB ( \-v ).
.TP
.B \-C
(planned)
.TP
.B \-x
(planned)
.TP
\fB\-o \fIopt\fR,\fIopt\fR,...
(may be specified several times).
Set resolver options (in a form \fIoption\fR:\fIvalue\fR) as if they
were set in
.RB $ RES_OPTIONS
environment variable, or set query flags:
.RS
.TP
\fBtimeout\fR:\fIsec\fR
Set initial query timeout to \fIsec\fR.
.TP
\fBattempts\fR:\fInum\fR
(re)try every query \fInum\fR times before failing.
.TP
\fBudpbuf\fR:\fIbytes\fR
set DNS UDP buffer size to \fIbytes\fR bytes. Valid values
are from 512 to 65535. If \fIbytes\fR is greather than 512,
EDNS0 (RFC 2671) extensions will be used.
.TP
\fBport\fR:\fInum\fR
Use given UDP port number \fInum\fR instead of the default port 53 (domain).
.TP
\fBaa\fR
set AA (auth only) query bit.
.TP
\fBnord\fR
do not set RD (recursion desired) query bit (set by default).
.TP
\fBdnssec\fR or \fBdo\fR
set DNSSEC OK (DO) query flag (\fBdnsget\fR does not verify DNSSEC signatures,
only displays them; this is set in EDNS RR).
.TP
\fBcd\fR
set CD (checking disabled) query bit.
.RE
.TP
\fB\-n \fInameserver\fR
Use the given nameserver(s) (may be specified more than once)
instead of the default. Using this option has the same same effect as
.RB $ NSCACHEIP
or
.RB $ NAMESERVERS
environment variables, with the only difference that only IPv4 addresses
are recognized for now, and it is possible to specify names (which will
be resolved using default settings) instead of IP addresses.
.TP
.B \-h
print short help and exit.
.SH "RETURN VALUE"
When all names where resovled successefully,
.B dnsget
exits with zero exit status. If at least one name was not found,
.B dnsget
will exit with return code 100. If some other error occured during
name resolution, it will exit with code 99. In case of usage or
initialization error,
.B dnsget
will return 1.
.SH "SEE ALSO"
.BR host (1)
.BR dig (1)
.BR resolv.conf (5)
.BR udns (3).

759
contrib/udns/dnsget.c Normal file
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@ -0,0 +1,759 @@
/* dnsget.c
simple host/dig-like application using UDNS library
Copyright (C) 2005 Michael Tokarev <mjt@corpit.ru>
This file is part of UDNS library, an async DNS stub resolver.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library, in file named COPYING.LGPL; if not,
write to the Free Software Foundation, Inc., 59 Temple Place,
Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef WINDOWS
#include <windows.h>
#include <winsock2.h>
#else
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/time.h>
#include <unistd.h>
#endif
#include <time.h>
#include <stdarg.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "udns.h"
#ifndef HAVE_GETOPT
# include "getopt.c"
#endif
#ifndef AF_INET6
# define AF_INET6 10
#endif
static char *progname;
static int verbose = 1;
static int errors;
static int notfound;
/* verbosity level:
* <0 - bare result
* 0 - bare result and error messages
* 1 - readable result
* 2 - received packet contents and `trying ...' stuff
* 3 - sent and received packet contents
*/
static void die(int errnum, const char *fmt, ...) {
va_list ap;
fprintf(stderr, "%s: ", progname);
va_start(ap, fmt); vfprintf(stderr, fmt, ap); va_end(ap);
if (errnum) fprintf(stderr, ": %s\n", strerror(errnum));
else putc('\n', stderr);
fflush(stderr);
exit(1);
}
static const char *dns_xntop(int af, const void *src) {
static char buf[6*5+4*4];
return dns_ntop(af, src, buf, sizeof(buf));
}
struct query {
const char *name; /* original query string */
unsigned char *dn; /* the DN being looked up */
enum dns_type qtyp; /* type of the query */
};
static void query_free(struct query *q) {
free(q->dn);
free(q);
}
static struct query *
query_new(const char *name, const unsigned char *dn, enum dns_type qtyp) {
struct query *q = malloc(sizeof(*q));
unsigned l = dns_dnlen(dn);
unsigned char *cdn = malloc(l);
if (!q || !cdn) die(0, "out of memory");
memcpy(cdn, dn, l);
q->name = name;
q->dn = cdn;
q->qtyp = qtyp;
return q;
}
static enum dns_class qcls = DNS_C_IN;
static void
dnserror(struct query *q, int errnum) {
if (verbose >= 0)
fprintf(stderr, "%s: unable to lookup %s record for %s: %s\n", progname,
dns_typename(q->qtyp), dns_dntosp(q->dn), dns_strerror(errnum));
if (errnum == DNS_E_NXDOMAIN || errnum == DNS_E_NODATA)
++notfound;
else
++errors;
query_free(q);
}
static const unsigned char *
printtxt(const unsigned char *c) {
unsigned n = *c++;
const unsigned char *e = c + n;
if (verbose > 0) while(c < e) {
if (*c < ' ' || *c >= 127) printf("\\%03u", *c);
else if (*c == '\\' || *c == '"') printf("\\%c", *c);
else putchar(*c);
++c;
}
else
fwrite(c, n, 1, stdout);
return e;
}
static void
printhex(const unsigned char *c, const unsigned char *e) {
while(c < e)
printf("%02x", *c++);
}
static unsigned char to_b64[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static void
printb64(const unsigned char *c, const unsigned char *e) {
while(c < e) {
putchar(to_b64[c[0] >> 2]);
if (c+1 < e) {
putchar(to_b64[(c[0] & 0x3) << 4 | c[1] >> 4]);
if (c+2 < e) {
putchar(to_b64[(c[1] & 0xf) << 2 | c[2] >> 6]);
putchar(to_b64[c[2] & 0x3f]);
}
else {
putchar(to_b64[(c[1] & 0xf) << 2]);
putchar('=');
break;
}
}
else {
putchar(to_b64[(c[0] & 0x3) << 4]);
putchar('=');
putchar('=');
break;
}
c += 3;
}
}
static void
printdate(time_t time) {
struct tm *tm = gmtime(&time);
printf("%04d%02d%02d%02d%02d%02d",
tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
}
static void
printrr(const struct dns_parse *p, struct dns_rr *rr) {
const unsigned char *pkt = p->dnsp_pkt;
const unsigned char *end = p->dnsp_end;
const unsigned char *dptr = rr->dnsrr_dptr;
const unsigned char *dend = rr->dnsrr_dend;
unsigned char *dn = rr->dnsrr_dn;
const unsigned char *c;
unsigned n;
if (verbose > 0) {
if (verbose > 1) {
if (!p->dnsp_rrl && !rr->dnsrr_dn[0] && rr->dnsrr_typ == DNS_T_OPT) {
printf(";EDNS%d OPT record (UDPsize: %d, ERcode: %d, Flags: 0x%02x): %d bytes\n",
(rr->dnsrr_ttl>>16) & 0xff, /* version */
rr->dnsrr_cls, /* udp size */
(rr->dnsrr_ttl>>24) & 0xff, /* extended rcode */
rr->dnsrr_ttl & 0xffff, /* flags */
rr->dnsrr_dsz);
return;
}
n = printf("%s.", dns_dntosp(rr->dnsrr_dn));
printf("%s%u\t%s\t%s\t",
n > 15 ? "\t" : n > 7 ? "\t\t" : "\t\t\t",
rr->dnsrr_ttl,
dns_classname(rr->dnsrr_cls),
dns_typename(rr->dnsrr_typ));
}
else
printf("%s. %s ", dns_dntosp(rr->dnsrr_dn), dns_typename(rr->dnsrr_typ));
}
switch(rr->dnsrr_typ) {
case DNS_T_CNAME:
case DNS_T_PTR:
case DNS_T_NS:
case DNS_T_MB:
case DNS_T_MD:
case DNS_T_MF:
case DNS_T_MG:
case DNS_T_MR:
if (dns_getdn(pkt, &dptr, end, dn, DNS_MAXDN) <= 0) goto xperr;
printf("%s.", dns_dntosp(dn));
break;
case DNS_T_A:
if (rr->dnsrr_dsz != 4) goto xperr;
printf("%d.%d.%d.%d", dptr[0], dptr[1], dptr[2], dptr[3]);
break;
case DNS_T_AAAA:
if (rr->dnsrr_dsz != 16) goto xperr;
printf("%s", dns_xntop(AF_INET6, dptr));
break;
case DNS_T_MX:
c = dptr + 2;
if (dns_getdn(pkt, &c, end, dn, DNS_MAXDN) <= 0 || c != dend) goto xperr;
printf("%d %s.", dns_get16(dptr), dns_dntosp(dn));
break;
case DNS_T_TXT:
/* first verify it */
for(c = dptr; c < dend; c += n) {
n = *c++;
if (c + n > dend) goto xperr;
}
c = dptr; n = 0;
while (c < dend) {
if (verbose > 0) printf(n++ ? "\" \"":"\"");
c = printtxt(c);
}
if (verbose > 0) putchar('"');
break;
case DNS_T_HINFO: /* CPU, OS */
c = dptr;
n = *c++; if ((c += n) >= dend) goto xperr;
n = *c++; if ((c += n) != dend) goto xperr;
c = dptr;
if (verbose > 0) putchar('"');
c = printtxt(c);
if (verbose > 0) printf("\" \""); else putchar(' ');
printtxt(c);
if (verbose > 0) putchar('"');
break;
case DNS_T_WKS:
c = dptr;
if (dptr + 4 + 2 >= end) goto xperr;
printf("%s %d", dns_xntop(AF_INET, dptr), dptr[4]);
c = dptr + 5;
for (n = 0; c < dend; ++c, n += 8) {
if (*c) {
unsigned b;
for (b = 0; b < 8; ++b)
if (*c & (1 << (7-b))) printf(" %d", n + b);
}
}
break;
case DNS_T_SRV: /* prio weight port targetDN */
c = dptr;
c += 2 + 2 + 2;
if (dns_getdn(pkt, &c, end, dn, DNS_MAXDN) <= 0 || c != dend) goto xperr;
c = dptr;
printf("%d %d %d %s.",
dns_get16(c+0), dns_get16(c+2), dns_get16(c+4),
dns_dntosp(dn));
break;
case DNS_T_NAPTR: /* order pref flags serv regexp repl */
c = dptr;
c += 4; /* order, pref */
for (n = 0; n < 3; ++n)
if (c >= dend) goto xperr;
else c += *c + 1;
if (dns_getdn(pkt, &c, end, dn, DNS_MAXDN) <= 0 || c != dend) goto xperr;
c = dptr;
printf("%u %u", dns_get16(c+0), dns_get16(c+2));
c += 4;
for(n = 0; n < 3; ++n) {
putchar(' ');
if (verbose > 0) putchar('"');
c = printtxt(c);
if (verbose > 0) putchar('"');
}
printf(" %s.", dns_dntosp(dn));
break;
case DNS_T_KEY:
case DNS_T_DNSKEY:
/* flags(2) proto(1) algo(1) pubkey */
case DNS_T_DS:
case DNS_T_DLV:
/* ktag(2) proto(1) algo(1) pubkey */
c = dptr;
if (c + 2 + 1 + 1 > dend) goto xperr;
printf("%d %d %d", dns_get16(c), c[2], c[3]);
c += 2 + 1 + 1;
if (c < dend) {
putchar(' ');
printb64(c, dend);
}
break;
case DNS_T_SIG:
case DNS_T_RRSIG:
/* type(2) algo(1) labels(1) ottl(4) sexp(4) sinc(4) tag(2) sdn sig */
c = dptr;
c += 2 + 1 + 1 + 4 + 4 + 4 + 2;
if (dns_getdn(pkt, &c, end, dn, DNS_MAXDN) <= 0) goto xperr;
printf("%s %u %u %u ",
dns_typename(dns_get16(dptr)), dptr[2], dptr[3], dns_get32(dptr+4));
printdate(dns_get32(dptr+8));
putchar(' ');
printdate(dns_get32(dptr+12));
printf(" %d %s. ", dns_get16(dptr+10), dns_dntosp(dn));
printb64(c, dend);
break;
case DNS_T_SSHFP: /* algo(1), fp type(1), fp... */
if (dend < dptr + 3) goto xperr;
printf("%u %u ", dptr[0], dptr[1]); /* algo, fp type */
printhex(dptr + 2, dend);
break;
#if 0 /* unused RR types? */
case DNS_T_NSEC: /* nextDN bitmaps */
c = dptr;
if (dns_getdn(pkt, &c, end, dn, DNS_MAXDN) <= 0) goto xperr;
printf("%s.", dns_dntosp(dn));
unfinished.
break;
#endif
case DNS_T_SOA:
c = dptr;
if (dns_getdn(pkt, &c, end, dn, DNS_MAXDN) <= 0 ||
dns_getdn(pkt, &c, end, dn, DNS_MAXDN) <= 0 ||
c + 4*5 != dend)
goto xperr;
dns_getdn(pkt, &dptr, end, dn, DNS_MAXDN);
printf("%s. ", dns_dntosp(dn));
dns_getdn(pkt, &dptr, end, dn, DNS_MAXDN);
printf("%s. ", dns_dntosp(dn));
printf("%u %u %u %u %u",
dns_get32(dptr), dns_get32(dptr+4), dns_get32(dptr+8),
dns_get32(dptr+12), dns_get32(dptr+16));
break;
case DNS_T_MINFO:
c = dptr;
if (dns_getdn(pkt, &c, end, dn, DNS_MAXDN) <= 0 ||
dns_getdn(pkt, &c, end, dn, DNS_MAXDN) <= 0 ||
c != dend)
goto xperr;
dns_getdn(pkt, &dptr, end, dn, DNS_MAXDN);
printf("%s. ", dns_dntosp(dn));
dns_getdn(pkt, &dptr, end, dn, DNS_MAXDN);
printf("%s.", dns_dntosp(dn));
break;
case DNS_T_NULL:
default:
printhex(dptr, dend);
break;
}
putchar('\n');
return;
xperr:
printf("<parse error>\n");
++errors;
}
static int
printsection(struct dns_parse *p, int nrr, const char *sname) {
struct dns_rr rr;
int r;
if (!nrr) return 0;
if (verbose > 1) printf("\n;; %s section (%d):\n", sname, nrr);
p->dnsp_rrl = nrr;
while((r = dns_nextrr(p, &rr)) > 0)
printrr(p, &rr);
if (r < 0) printf("<<ERROR>>\n");
return r;
}
/* dbgcb will only be called if verbose > 1 */
static void
dbgcb(int code, const struct sockaddr *sa, unsigned slen,
const unsigned char *pkt, int r,
const struct dns_query *unused_q, void *unused_data) {
struct dns_parse p;
const unsigned char *cur, *end;
int numqd;
if (code > 0) {
printf(";; trying %s.\n", dns_dntosp(dns_payload(pkt)));
printf(";; sending %d bytes query to ", r);
}
else
printf(";; received %d bytes response from ", r);
if (sa->sa_family == AF_INET && slen >= sizeof(struct sockaddr_in))
printf("%s port %d\n",
dns_xntop(AF_INET, &((struct sockaddr_in*)sa)->sin_addr),
htons(((struct sockaddr_in*)sa)->sin_port));
#ifdef HAVE_IPv6
else if (sa->sa_family == AF_INET6 && slen >= sizeof(struct sockaddr_in6))
printf("%s port %d\n",
dns_xntop(AF_INET6, &((struct sockaddr_in6*)sa)->sin6_addr),
htons(((struct sockaddr_in6*)sa)->sin6_port));
#endif
else
printf("<<unknown socket type %d>>\n", sa->sa_family);
if (code > 0 && verbose < 3) {
putchar('\n');
return;
}
if (code == -2) printf(";; reply from unexpected source\n");
if (code == -5) printf(";; reply to a query we didn't sent (or old)\n");
if (r < DNS_HSIZE) {
printf(";; short packet (%d bytes)\n", r);
return;
}
if (dns_opcode(pkt) != 0)
printf(";; unexpected opcode %d\n", dns_opcode(pkt));
if (dns_tc(pkt) != 0)
printf(";; warning: TC bit set, probably incomplete reply\n");
printf(";; ->>HEADER<<- opcode: ");
switch(dns_opcode(pkt)) {
case 0: printf("QUERY"); break;
case 1: printf("IQUERY"); break;
case 2: printf("STATUS"); break;
default: printf("UNKNOWN(%u)", dns_opcode(pkt)); break;
}
printf(", status: %s, id: %d, size: %d\n;; flags:",
dns_rcodename(dns_rcode(pkt)), dns_qid(pkt), r);
if (dns_qr(pkt)) printf(" qr");
if (dns_aa(pkt)) printf(" aa");
if (dns_tc(pkt)) printf(" tc");
if (dns_rd(pkt)) printf(" rd");
if (dns_ra(pkt)) printf(" ra");
/* if (dns_z(pkt)) printf(" z"); only one reserved bit left */
if (dns_ad(pkt)) printf(" ad");
if (dns_cd(pkt)) printf(" cd");
numqd = dns_numqd(pkt);
printf("; QUERY: %d, ANSWER: %d, AUTHORITY: %d, ADDITIONAL: %d\n",
numqd, dns_numan(pkt), dns_numns(pkt), dns_numar(pkt));
if (numqd != 1)
printf(";; unexpected number of entries in QUERY section: %d\n",
numqd);
printf("\n;; QUERY SECTION (%d):\n", numqd);
cur = dns_payload(pkt);
end = pkt + r;
while(numqd--) {
if (dns_getdn(pkt, &cur, end, p.dnsp_dnbuf, DNS_MAXDN) <= 0 ||
cur + 4 > end) {
printf("; invalid query section\n");
return;
}
r = printf(";%s.", dns_dntosp(p.dnsp_dnbuf));
printf("%s%s\t%s\n",
r > 23 ? "\t" : r > 15 ? "\t\t" : r > 7 ? "\t\t\t" : "\t\t\t\t",
dns_classname(dns_get16(cur+2)), dns_typename(dns_get16(cur)));
cur += 4;
}
p.dnsp_pkt = pkt;
p.dnsp_cur = p.dnsp_ans = cur;
p.dnsp_end = end;
p.dnsp_qdn = NULL;
p.dnsp_qcls = p.dnsp_qtyp = 0;
p.dnsp_ttl = 0xffffffffu;
p.dnsp_nrr = 0;
r = printsection(&p, dns_numan(pkt), "ANSWER");
if (r == 0)
r = printsection(&p, dns_numns(pkt), "AUTHORITY");
if (r == 0)
r = printsection(&p, dns_numar(pkt), "ADDITIONAL");
putchar('\n');
}
static void dnscb(struct dns_ctx *ctx, void *result, void *data) {
int r = dns_status(ctx);
struct query *q = data;
struct dns_parse p;
struct dns_rr rr;
unsigned nrr;
unsigned char dn[DNS_MAXDN];
const unsigned char *pkt, *cur, *end;
if (!result) {
dnserror(q, r);
return;
}
pkt = result; end = pkt + r; cur = dns_payload(pkt);
dns_getdn(pkt, &cur, end, dn, sizeof(dn));
dns_initparse(&p, NULL, pkt, cur, end);
p.dnsp_qcls = p.dnsp_qtyp = 0;
nrr = 0;
while((r = dns_nextrr(&p, &rr)) > 0) {
if (!dns_dnequal(dn, rr.dnsrr_dn)) continue;
if ((qcls == DNS_C_ANY || qcls == rr.dnsrr_cls) &&
(q->qtyp == DNS_T_ANY || q->qtyp == rr.dnsrr_typ))
++nrr;
else if (rr.dnsrr_typ == DNS_T_CNAME && !nrr) {
if (dns_getdn(pkt, &rr.dnsrr_dptr, end,
p.dnsp_dnbuf, sizeof(p.dnsp_dnbuf)) <= 0 ||
rr.dnsrr_dptr != rr.dnsrr_dend) {
r = DNS_E_PROTOCOL;
break;
}
else {
if (verbose == 1) {
printf("%s.", dns_dntosp(dn));
printf(" CNAME %s.\n", dns_dntosp(p.dnsp_dnbuf));
}
dns_dntodn(p.dnsp_dnbuf, dn, sizeof(dn));
}
}
}
if (!r && !nrr)
r = DNS_E_NODATA;
if (r < 0) {
dnserror(q, r);
free(result);
return;
}
if (verbose < 2) { /* else it is already printed by dbgfn */
dns_rewind(&p, NULL);
p.dnsp_qtyp = q->qtyp == DNS_T_ANY ? 0 : q->qtyp;
p.dnsp_qcls = qcls == DNS_C_ANY ? 0 : qcls;
while(dns_nextrr(&p, &rr))
printrr(&p, &rr);
}
free(result);
query_free(q);
}
int main(int argc, char **argv) {
int i;
int fd;
fd_set fds;
struct timeval tv;
time_t now;
char *ns[DNS_MAXSERV];
int nns = 0;
struct query *q;
enum dns_type qtyp = 0;
struct dns_ctx *nctx = NULL;
int flags = 0;
if (!(progname = strrchr(argv[0], '/'))) progname = argv[0];
else argv[0] = ++progname;
if (argc <= 1)
die(0, "try `%s -h' for help", progname);
if (dns_init(NULL, 0) < 0 || !(nctx = dns_new(NULL)))
die(errno, "unable to initialize dns library");
/* we keep two dns contexts: one may be needed to resolve
* nameservers if given as names, using default options.
*/
while((i = getopt(argc, argv, "vqt:c:an:o:f:h")) != EOF) switch(i) {
case 'v': ++verbose; break;
case 'q': --verbose; break;
case 't':
if (optarg[0] == '*' && !optarg[1])
i = DNS_T_ANY;
else if ((i = dns_findtypename(optarg)) <= 0)
die(0, "unrecognized query type `%s'", optarg);
qtyp = i;
break;
case 'c':
if (optarg[0] == '*' && !optarg[1])
i = DNS_C_ANY;
else if ((i = dns_findclassname(optarg)) < 0)
die(0, "unrecognized query class `%s'", optarg);
qcls = i;
break;
case 'a':
qtyp = DNS_T_ANY;
++verbose;
break;
case 'n':
if (nns >= DNS_MAXSERV)
die(0, "too many nameservers, %d max", DNS_MAXSERV);
ns[nns++] = optarg;
break;
case 'o':
case 'f': {
char *opt;
const char *const delim = " \t,;";
for(opt = strtok(optarg, delim); opt != NULL; opt = strtok(NULL, delim)) {
if (dns_set_opts(NULL, optarg) == 0)
;
else if (strcmp(opt, "aa") == 0) flags |= DNS_AAONLY;
else if (strcmp(optarg, "nord") == 0) flags |= DNS_NORD;
else if (strcmp(optarg, "dnssec") == 0) flags |= DNS_SET_DO;
else if (strcmp(optarg, "do") == 0) flags |= DNS_SET_DO;
else if (strcmp(optarg, "cd") == 0) flags |= DNS_SET_CD;
else
die(0, "invalid option: `%s'", opt);
}
break;
}
case 'h':
printf(
"%s: simple DNS query tool (using udns version %s)\n"
"Usage: %s [options] domain-name...\n"
"where options are:\n"
" -h - print this help and exit\n"
" -v - be more verbose\n"
" -q - be less verbose\n"
" -t type - set query type (A, AAA, PTR etc)\n"
" -c class - set query class (IN (default), CH, HS, *)\n"
" -a - equivalent to -t ANY -v\n"
" -n ns - use given nameserver(s) instead of default\n"
" (may be specified multiple times)\n"
" -o opt,opt,... (comma- or space-separated list,\n"
" may be specified more than once):\n"
" set resovler options (the same as setting $RES_OPTIONS):\n"
" timeout:sec - initial query timeout\n"
" attempts:num - number of attempt to resovle a query\n"
" ndots:num - if name has more than num dots, lookup it before search\n"
" port:num - port number for queries instead of default 53\n"
" udpbuf:num - size of UDP buffer (use EDNS0 if >512)\n"
" or query flags:\n"
" aa,nord,dnssec,do,cd - set query flag (auth-only, no recursion,\n"
" enable DNSSEC (DNSSEC Ok), check disabled)\n"
, progname, dns_version(), progname);
return 0;
default:
die(0, "try `%s -h' for help", progname);
}
argc -= optind; argv += optind;
if (!argc)
die(0, "no name(s) to query specified");
if (nns) {
/* if nameservers given as names, resolve them.
* We only allow IPv4 nameservers as names for now.
* Ok, it is easy enouth to try both AAAA and A,
* but the question is what to do by default.
*/
struct sockaddr_in sin;
int j, r = 0, opened = 0;
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_port = htons(dns_set_opt(NULL, DNS_OPT_PORT, -1));
dns_add_serv(NULL, NULL);
for(i = 0; i < nns; ++i) {
if (dns_pton(AF_INET, ns[i], &sin.sin_addr) <= 0) {
struct dns_rr_a4 *rr;
if (!opened) {
if (dns_open(nctx) < 0)
die(errno, "unable to initialize dns context");
opened = 1;
}
rr = dns_resolve_a4(nctx, ns[i], 0);
if (!rr)
die(0, "unable to resolve nameserver %s: %s",
ns[i], dns_strerror(dns_status(nctx)));
for(j = 0; j < rr->dnsa4_nrr; ++j) {
sin.sin_addr = rr->dnsa4_addr[j];
if ((r = dns_add_serv_s(NULL, (struct sockaddr *)&sin)) < 0)
break;
}
free(rr);
}
else
r = dns_add_serv_s(NULL, (struct sockaddr *)&sin);
if (r < 0)
die(errno, "unable to add nameserver %s",
dns_xntop(AF_INET, &sin.sin_addr));
}
}
dns_free(nctx);
fd = dns_open(NULL);
if (fd < 0)
die(errno, "unable to initialize dns context");
if (verbose > 1)
dns_set_dbgfn(NULL, dbgcb);
if (flags)
dns_set_opt(NULL, DNS_OPT_FLAGS, flags);
for (i = 0; i < argc; ++i) {
char *name = argv[i];
union {
struct in_addr addr;
struct in6_addr addr6;
} a;
unsigned char dn[DNS_MAXDN];
enum dns_type l_qtyp = 0;
int abs;
if (dns_pton(AF_INET, name, &a.addr) > 0) {
dns_a4todn(&a.addr, 0, dn, sizeof(dn));
l_qtyp = DNS_T_PTR;
abs = 1;
}
#ifdef HAVE_IPv6
else if (dns_pton(AF_INET6, name, &a.addr6) > 0) {
dns_a6todn(&a.addr6, 0, dn, sizeof(dn));
l_qtyp = DNS_T_PTR;
abs = 1;
}
#endif
else if (!dns_ptodn(name, strlen(name), dn, sizeof(dn), &abs))
die(0, "invalid name `%s'\n", name);
else
l_qtyp = DNS_T_A;
if (qtyp) l_qtyp = qtyp;
q = query_new(name, dn, l_qtyp);
if (abs) abs = DNS_NOSRCH;
if (!dns_submit_dn(NULL, dn, qcls, l_qtyp, abs, 0, dnscb, q))
dnserror(q, dns_status(NULL));
}
FD_ZERO(&fds);
now = 0;
while((i = dns_timeouts(NULL, -1, now)) > 0) {
FD_SET(fd, &fds);
tv.tv_sec = i;
tv.tv_usec = 0;
i = select(fd+1, &fds, 0, 0, &tv);
now = time(NULL);
if (i > 0) dns_ioevent(NULL, now);
}
return errors ? 1 : notfound ? 100 : 0;
}

114
contrib/udns/ex-rdns.c Normal file
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/* ex-rdns.c
parallel rDNS resolver example - read IP addresses from stdin,
write domain names to stdout
Copyright (C) 2005 Michael Tokarev <mjt@corpit.ru>
This file is part of UDNS library, an async DNS stub resolver.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library, in file named COPYING.LGPL; if not,
write to the Free Software Foundation, Inc., 59 Temple Place,
Suite 330, Boston, MA 02111-1307 USA
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/poll.h>
#include <unistd.h>
#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#include <string.h>
#include "udns.h"
static int curq;
static const char *n2ip(const unsigned char *c) {
static char b[sizeof("255.255.255.255")];
sprintf(b, "%u.%u.%u.%u", c[0], c[1], c[2], c[3]);
return b;
}
static void dnscb(struct dns_ctx *ctx, struct dns_rr_ptr *rr, void *data) {
const char *ip = n2ip((unsigned char *)&data);
int i;
--curq;
if (rr) {
printf("%s", ip);
for(i = 0; i < rr->dnsptr_nrr; ++i)
printf(" %s", rr->dnsptr_ptr[i]);
putchar('\n');
free(rr);
}
else
fprintf(stderr, "%s: %s\n", ip, dns_strerror(dns_status(ctx)));
}
int main(int argc, char **argv) {
int c;
time_t now;
int maxq = 10;
struct pollfd pfd;
char linebuf[1024];
char *eol;
int eof;
if (dns_init(NULL, 1) < 0) {
fprintf(stderr, "unable to initialize dns library\n");
return 1;
}
while((c = getopt(argc, argv, "m:r")) != EOF) switch(c) {
case 'm': maxq = atoi(optarg); break;
case 'r':
dns_set_opt(0, DNS_OPT_FLAGS,
dns_set_opt(0, DNS_OPT_FLAGS, -1) | DNS_NORD);
break;
default: return 1;
}
if (argc != optind) return 1;
pfd.fd = dns_sock(0);
pfd.events = POLLIN;
now = time(NULL);
c = optind;
eof = 0;
while(curq || !eof) {
if (!eof && curq < maxq) {
union { struct in_addr a; void *p; } pa;
if (!fgets(linebuf, sizeof(linebuf), stdin)) {
eof = 1;
continue;
}
eol = strchr(linebuf, '\n');
if (eol) *eol = '\0';
if (!linebuf[0]) continue;
if (dns_pton(AF_INET, linebuf, &pa.a) <= 0)
fprintf(stderr, "%s: invalid address\n", linebuf);
else if (dns_submit_a4ptr(0, &pa.a, dnscb, pa.p) == 0)
fprintf(stderr, "%s: unable to submit query: %s\n",
linebuf, dns_strerror(dns_status(0)));
else
++curq;
continue;
}
if (curq) {
c = dns_timeouts(0, -1, now);
c = poll(&pfd, 1, c < 0 ? -1 : c * 1000);
now = time(NULL);
if (c)
dns_ioevent(0, now);
}
}
return 0;
}

165
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/* getopt.c
* Simple getopt() implementation.
*
* Standard interface:
* extern int getopt(int argc, char *const *argv, const char *opts);
* extern int optind; current index in argv[]
* extern char *optarg; argument for the current option
* extern int optopt; the current option
* extern int opterr; to control error printing
*
* Some minor extensions:
* ignores leading `+' sign in opts[] (unemplemented GNU extension)
* handles optional arguments, in form "x::" in opts[]
* if opts[] starts with `:', will return `:' in case of missing required
* argument, instead of '?'.
*
* Compile with -DGETOPT_NO_OPTERR to never print errors internally.
* Compile with -DGETOPT_NO_STDIO to use write() calls instead of fprintf() for
* error reporting (ignored with -DGETOPT_NO_OPTERR).
* Compile with -DGETOPT_CLASS=static to get static linkage.
* Compile with -DGETOPT_MY to redefine all visible symbols to be prefixed
* with "my_", like my_getopt instead of getopt.
* Compile with -DTEST to get a test executable.
*
* Written by Michael Tokarev. Public domain.
*/
#include <string.h>
#ifndef GETOPT_CLASS
# define GETOPT_CLASS
#endif
#ifdef GETOPT_MY
# define optarg my_optarg
# define optind my_optind
# define opterr my_opterr
# define optopt my_optopt
# define getopt my_getopt
#endif
GETOPT_CLASS char *optarg /* = NULL */;
GETOPT_CLASS int optind = 1;
GETOPT_CLASS int opterr = 1;
GETOPT_CLASS int optopt;
static char *nextc /* = NULL */;
#if defined(GETOPT_NO_OPTERR)
#define printerr(argv, msg)
#elif defined(GETOPT_NO_STDIO)
extern int write(int, void *, int);
static void printerr(char *const *argv, const char *msg) {
if (opterr) {
char buf[64];
unsigned pl = strlen(argv[0]);
unsigned ml = strlen(msg);
char *p;
if (pl + /*": "*/2 + ml + /*" -- c\n"*/6 > sizeof(buf)) {
write(2, argv[0], pl);
p = buf;
}
else {
memcpy(buf, argv[0], ml);
p = buf + pl;
}
*p++ = ':'; *p++ = ' ';
memcpy(p, msg, ml); p += ml;
*p++ = ' '; *p++ = '-'; *p++ = '-'; *p++ = ' ';
*p++ = optopt;
*p++ = '\n';
write(2, buf, p - buf);
}
}
#else
#include <stdio.h>
static void printerr(char *const *argv, const char *msg) {
if (opterr)
fprintf(stderr, "%s: %s -- %c\n", argv[0], msg, optopt);
}
#endif
GETOPT_CLASS int getopt(int argc, char *const *argv, const char *opts) {
char *p;
optarg = 0;
if (*opts == '+') /* GNU extension (permutation) - isn't supported */
++opts;
if (!optind) { /* a way to reset things */
nextc = 0;
optind = 1;
}
if (!nextc || !*nextc) { /* advance to the next argv element */
/* done scanning? */
if (optind >= argc)
return -1;
/* not an optional argument */
if (argv[optind][0] != '-')
return -1;
/* bare `-' */
if (argv[optind][1] == '\0')
return -1;
/* special case `--' argument */
if (argv[optind][1] == '-' && argv[optind][2] == '\0') {
++optind;
return -1;
}
nextc = argv[optind] + 1;
}
optopt = *nextc++;
if (!*nextc)
++optind;
p = strchr(opts, optopt);
if (!p || optopt == ':') {
printerr(argv, "illegal option");
return '?';
}
if (p[1] == ':') {
if (*nextc) {
optarg = nextc;
nextc = NULL;
++optind;
}
else if (p[2] != ':') { /* required argument */
if (optind >= argc) {
printerr(argv, "option requires an argument");
return *opts == ':' ? ':' : '?';
}
else
optarg = argv[optind++];
}
}
return optopt;
}
#ifdef TEST
#include <stdio.h>
int main(int argc, char **argv) {
int c;
while((c = getopt(argc, argv, "ab:c::")) != -1) switch(c) {
case 'a':
case 'b':
case 'c':
printf("option %c %s\n", c, optarg ? optarg : "(none)");
break;
default:
return -1;
}
for(c = optind; c < argc; ++c)
printf("non-opt: %s\n", argv[c]);
return 0;
}
#endif

327
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/* inet_XtoX.c
* Simple implementation of the following functions:
* inet_ntop(), inet_ntoa(), inet_pton(), inet_aton().
*
* Differences from traditional implementaitons:
* o modifies destination buffers even on error return.
* o no fancy (hex, or 1.2) input support in inet_aton()
* o inet_aton() does not accept junk after an IP address.
* o inet_ntop(AF_INET) requires at least 16 bytes in dest,
* and inet_ntop(AF_INET6) at least 40 bytes
* (traditional inet_ntop() will try to fit anyway)
*
* Compile with -Dinet_XtoX_prefix=pfx_ to have pfx_*() instead of inet_*()
* Compile with -Dinet_XtoX_no_ntop or -Dinet_XtoX_no_pton
* to disable net2str or str2net conversions.
*
* #define inet_XtoX_prototypes and #include "this_file.c"
* to get function prototypes only (but not for inet_ntoa()).
* #define inet_XtoX_decl to be `static' for static visibility,
* or use __declspec(dllexport) or somesuch...
*
* Compile with -DTEST to test against stock implementation.
*
* Written by Michael Tokarev. Public domain.
*/
#ifdef inet_XtoX_prototypes
struct in_addr;
#else
#include <errno.h>
#ifdef TEST
# include <netinet/in.h>
# include <sys/socket.h>
# include <arpa/inet.h>
# include <stdio.h>
# include <stdlib.h>
# include <unistd.h>
# include <string.h>
# undef inet_XtoX_prefix
# define inet_XtoX_prefix mjt_inet_
# undef inet_XtoX_no_ntop
# undef inet_XtoX_no_pton
#else /* !TEST */
struct in_addr { /* declare it here to avoid messing with headers */
unsigned char x[4];
};
#endif /* TEST */
#endif /* inet_XtoX_prototypes */
#ifndef inet_XtoX_prefix
# define inet_XtoX_prefix inet_
#endif
#ifndef inet_XtoX_decl
# define inet_XtoX_decl /*empty*/
#endif
#define cc2_(x,y) cc2__(x,y)
#define cc2__(x,y) x##y
#define fn(x) cc2_(inet_XtoX_prefix,x)
#ifndef inet_XtoX_no_ntop
inet_XtoX_decl const char *
fn(ntop)(int af, const void *src, char *dst, unsigned size);
#ifndef inet_XtoX_prototypes
static int mjt_ntop4(const void *_src, char *dst, int size) {
unsigned i, x, r;
char *p;
const unsigned char *s = _src;
if (size < 4*4) /* for simplicity, disallow non-max-size buffer */
return 0;
for (i = 0, p = dst; i < 4; ++i) {
if (i) *p++ = '.';
x = r = s[i];
if (x > 99) { *p++ = (char)(r / 100 + '0'); r %= 100; }
if (x > 9) { *p++ = (char)(r / 10 + '0'); r %= 10; }
*p++ = (char)(r + '0');
}
*p = '\0';
return 1;
}
static char *hexc(char *p, unsigned x) {
static char hex[16] = "0123456789abcdef";
if (x > 0x0fff) *p++ = hex[(x >>12) & 15];
if (x > 0x00ff) *p++ = hex[(x >> 8) & 15];
if (x > 0x000f) *p++ = hex[(x >> 4) & 15];
*p++ = hex[x & 15];
return p;
}
static int mjt_ntop6(const void *_src, char *dst, int size) {
unsigned i;
unsigned short w[8];
unsigned bs = 0, cs = 0;
unsigned bl = 0, cl = 0;
char *p;
const unsigned char *s = _src;
if (size < 40) /* for simplicity, disallow non-max-size buffer */
return 0;
for(i = 0; i < 8; ++i, s += 2) {
w[i] = (((unsigned short)(s[0])) << 8) | s[1];
if (!w[i]) {
if (!cl++) cs = i;
}
else {
if (cl > bl) bl = cl, bs = cs;
}
}
if (cl > bl) bl = cl, bs = cs;
p = dst;
if (bl == 1)
bl = 0;
if (bl) {
for(i = 0; i < bs; ++i) {
if (i) *p++ = ':';
p = hexc(p, w[i]);
}
*p++ = ':';
i += bl;
if (i == 8)
*p++ = ':';
}
else
i = 0;
for(; i < 8; ++i) {
if (i) *p++ = ':';
if (i == 6 && !bs && (bl == 6 || (bl == 5 && w[5] == 0xffff)))
return mjt_ntop4(s - 4, p, size - (p - dst));
p = hexc(p, w[i]);
}
*p = '\0';
return 1;
}
inet_XtoX_decl const char *
fn(ntop)(int af, const void *src, char *dst, unsigned size) {
switch(af) {
/* don't use AF_*: don't mess with headers */
case 2: /* AF_INET */ if (mjt_ntop4(src, dst, size)) return dst; break;
case 10: /* AF_INET6 */ if (mjt_ntop6(src, dst, size)) return dst; break;
default: errno = EAFNOSUPPORT; return (char*)0;
}
errno = ENOSPC;
return (char*)0;
}
inet_XtoX_decl const char *
fn(ntoa)(struct in_addr addr) {
static char buf[4*4];
mjt_ntop4(&addr, buf, sizeof(buf));
return buf;
}
#endif /* inet_XtoX_prototypes */
#endif /* inet_XtoX_no_ntop */
#ifndef inet_XtoX_no_pton
inet_XtoX_decl int fn(pton)(int af, const char *src, void *dst);
inet_XtoX_decl int fn(aton)(const char *src, struct in_addr *addr);
#ifndef inet_XtoX_prototypes
static int mjt_pton4(const char *c, void *dst) {
unsigned char *a = dst;
unsigned n, o;
for (n = 0; n < 4; ++n) {
if (*c < '0' || *c > '9')
return 0;
o = *c++ - '0';
while(*c >= '0' && *c <= '9')
if ((o = o * 10 + (*c++ - '0')) > 255)
return 0;
if (*c++ != (n == 3 ? '\0' : '.'))
return 0;
*a++ = (unsigned char)o;
}
return 1;
}
static int mjt_pton6(const char *c, void *dst) {
unsigned short w[8], *a = w, *z, *i;
unsigned v, o;
const char *sc;
unsigned char *d = dst;
if (*c != ':') z = (unsigned short*)0;
else if (*++c != ':') return 0;
else ++c, z = a;
i = 0;
for(;;) {
v = 0;
sc = c;
for(;;) {
if (*c >= '0' && *c <= '9') o = *c - '0';
else if (*c >= 'a' && *c <= 'f') o = *c - 'a' + 10;
else if (*c >= 'A' && *c <= 'F') o = *c - 'A' + 10;
else break;
v = (v << 4) | o;
if (v > 0xffff) return 0;
++c;
}
if (sc == c) {
if (z == a && !*c)
break;
else
return 0;
}
if (*c == ':') {
if (a >= w + 8)
return 0;
*a++ = v;
if (*++c == ':') {
if (z)
return 0;
z = a;
if (!*++c)
break;
}
}
else if (!*c) {
if (a >= w + 8)
return 0;
*a++ = v;
break;
}
else if (*c == '.') {
if (a > w + 6)
return 0;
if (!mjt_pton4(sc, d))
return 0;
*a++ = ((unsigned)(d[0]) << 8) | d[1];
*a++ = ((unsigned)(d[2]) << 8) | d[3];
break;
}
else
return 0;
}
v = w + 8 - a;
if ((v && !z) || (!v && z))
return 0;
for(i = w; ; ++i) {
if (i == z)
while(v--) { *d++ = '\0'; *d++ = '\0'; }
if (i >= a)
break;
*d++ = (unsigned char)((*i >> 8) & 255);
*d++ = (unsigned char)(*i & 255);
}
return 1;
}
inet_XtoX_decl int fn(pton)(int af, const char *src, void *dst) {
switch(af) {
/* don't use AF_*: don't mess with headers */
case 2 /* AF_INET */: return mjt_pton4(src, dst);
case 10 /* AF_INET6 */: return mjt_pton6(src, dst);
default: errno = EAFNOSUPPORT; return -1;
}
}
inet_XtoX_decl int fn(aton)(const char *src, struct in_addr *addr) {
return mjt_pton4(src, addr);
}
#endif /* inet_XtoX_prototypes */
#endif /* inet_XtoX_no_pton */
#ifdef TEST
int main(int argc, char **argv) {
int i;
char n0[16], n1[16];
char p0[64], p1[64];
int af = AF_INET;
int pl = sizeof(p0);
int r0, r1;
const char *s0, *s1;
while((i = getopt(argc, argv, "46a:p:")) != EOF) switch(i) {
case '4': af = AF_INET; break;
case '6': af = AF_INET6; break;
case 'a': case 'p': pl = atoi(optarg); break;
default: return 1;
}
for(i = optind; i < argc; ++i) {
char *a = argv[i];
printf("%s:\n", a);
r0 = inet_pton(af, a, n0);
printf(" p2n stock: %s\n",
(r0 < 0 ? "(notsupp)" : !r0 ? "(inval)" : fn(ntop)(af,n0,p0,sizeof(p0))));
r1 = fn(pton)(af, a, n1);
printf(" p2n this : %s\n",
(r1 < 0 ? "(notsupp)" : !r1 ? "(inval)" : fn(ntop)(af,n1,p1,sizeof(p1))));
if ((r0 > 0) != (r1 > 0) ||
(r0 > 0 && r1 > 0 && memcmp(n0, n1, af == AF_INET ? 4 : 16) != 0))
printf(" DIFFER!\n");
s0 = inet_ntop(af, n1, p0, pl);
printf(" n2p stock: %s\n", s0 ? s0 : "(inval)");
s1 = fn(ntop)(af, n1, p1, pl);
printf(" n2p this : %s\n", s1 ? s1 : "(inval)");
if ((s0 != 0) != (s1 != 0) ||
(s0 && s1 && strcmp(s0, s1) != 0))
printf(" DIFFER!\n");
}
return 0;
}
#endif /* TEST */

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.\" rblcheck.1
.\" rblckeck manpage
.\"
.\" Copyright (C) 2005 Michael Tokarev <mjt@corpit.ru>
.\" This file is part of UDNS library, an async DNS stub resolver.
.\"
.\" This library is free software; you can redistribute it and/or
.\" modify it under the terms of the GNU Lesser General Public
.\" License as published by the Free Software Foundation; either
.\" version 2.1 of the License, or (at your option) any later version.
.\"
.\" This library is distributed in the hope that it will be useful,
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
.\" Lesser General Public License for more details.
.\"
.\" You should have received a copy of the GNU Lesser General Public
.\" License along with this library, in file named COPYING.LGPL; if not,
.\" write to the Free Software Foundation, Inc., 59 Temple Place,
.\" Suite 330, Boston, MA 02111-1307 USA
.TH rblckeck 1 "Apr 2005" "User Utilities"
.SH NAME
rblckeck \- DNSBL lookup utility
.SH SYNOPSYS
.B rblcheck
.RB [\| \-s
.IR zone \|]
.RB [\| \-S
.IR zone\-file \|]
.RB [\| \-c \|]
.RB [\| \-tmvq \|]
.RB [\| \-n
.IR nsaddr \|]
.IR address \|.\|.\|.
.SH DESCRIPTION
.B rblcheck
is a simple command-line to perform DNSBL (DNS-based blocklists) lookups.
For every IP address (or a name, in which case it will be resolved to an
address first), the utility verifies whenever it is listed in a (list of)
DNS blocklists specified with
.B \-s
or
.B \-S
options, optionally obtains text assotiated with the listing (usually it
is either some description about the reason of the listing or an URL
referring to such a description), and displays results on standard output.
.PP
The program is implemented on top of
.BR udns (3)
library.
.SH OPTIONS
The following options are recognized by
.BR rblcheck :
.TP
.B \-s \fIzone\fR
add the given \fIzone\fR DNSBL name to the list of active zones.
.TP
.B \-S \fIzone-file\fR
add list of zones from the named \fIzone-file\fR to the list of
active zones (the file specifies one zone as the first word on a
line, empty lines and lines starting with `#' character are ignored).
.TP
.B \-c
reset active zone list.
.TP
.B \-v
be more verbose, produce more detailed output.
.TP
.B \-q
the opposite for \fB\-v\fR -- produce less detailed output.
.TP
.B \-t
obtain text for listed addresses.
.TP
.B \-n \fInsaddr\fR
Use the given nameserver (given as IPv4 or IPv6 address) instead of the
default. The same effect may be achieved by setting $NSCACHEIP environment
variable.
.TP
.B \-m
stop after first hit, ie after the first address which is found to be
listed.
.TP
.B \-h
print short help and exit.
.PP
If no
.BR \-s ,
.BR \-S
and
.B \-c
options are given,
.B rblcheck
will try to obtain list of zones using $RBLCHECK_ZONES environment variable,
or ~/.rblcheckrc, or /etc/rblckechrc files, in that order. If no zones are
found, it will exit unsuccessefully.
.SH "RETURN VALUE"
When no addresses given are listed and no errors occured,
.B rblcheck
exits with code 0. If at least one address is listed,
.B rblcheck
returns 100. In case of DNS errors,
.B rblcheck
returns 2.
.SH ENVIRONMENT
.TP
.B $RBLCHECK_ZONES
if no
.BR \-s ,
.B \-S
or
.B \-c
option is given,
.B rblcheck
tries this variable to obtain list of DNSBL zones to check against.
.SH FILES
.TP
$HOME/.rblcheckrc and /etc/rblcheckrc
if no
.BR \-s ,
.B \-S
or
.B \-c
option is given, and no $RBLCHECK_ZONES environment variable is set,
.B rblcheck
will try the two files (the first one that exists) to obtain list of
DNSBL zones to check against.
Each line specifies one zone (only first word in each line is used).
Empty lines and lines starting with `#' character are ignored.
.SH "SEE ALSO"
.BR dnsget (1)
.BR resolv.conf (5)
.BR udns (3).
.SH AUTHOR
This program and manual pages are written by Michael Tokarev.

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/* rblcheck.c
dnsbl (rbl) checker application
Copyright (C) 2005 Michael Tokarev <mjt@corpit.ru>
This file is part of UDNS library, an async DNS stub resolver.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library, in file named COPYING.LGPL; if not,
write to the Free Software Foundation, Inc., 59 Temple Place,
Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef WINDOWS
# include <winsock2.h>
#else
# include <unistd.h>
# include <sys/types.h>
# include <sys/socket.h>
# include <netinet/in.h>
#endif
#include <time.h>
#include <errno.h>
#include <stdarg.h>
#include "udns.h"
#ifndef HAVE_GETOPT
# include "getopt.c"
#endif
static const char *version = "udns-rblcheck 0.4";
static char *progname;
static void error(int die, const char *fmt, ...) {
va_list ap;
fprintf(stderr, "%s: ", progname);
va_start(ap, fmt); vfprintf(stderr, fmt, ap); va_end(ap);
putc('\n', stderr);
fflush(stderr);
if (die)
exit(1);
}
struct rblookup {
struct ipcheck *parent;
struct in_addr key;
const char *zone;
struct dns_rr_a4 *addr;
struct dns_rr_txt *txt;
};
struct ipcheck {
const char *name;
int naddr;
int listed;
struct rblookup *lookup;
};
#define notlisted ((void*)1)
static int nzones, nzalloc;
static const char **zones;
static int do_txt;
static int stopfirst;
static int verbose = 1;
/* verbosity level:
* <0 - only bare As/TXTs
* 0 - what RBL result
* 1(default) - what is listed by RBL: result
* 2 - what is[not ]listed by RBL: result, name lookups
*/
static int listed;
static int failures;
static void *ecalloc(int size, int cnt) {
void *t = calloc(size, cnt);
if (!t)
error(1, "out of memory");
return t;
}
static void addzone(const char *zone) {
if (nzones >= nzalloc) {
const char **zs = (const char**)ecalloc(sizeof(char*), (nzalloc += 16));
if (zones) {
memcpy(zs, zones, nzones * sizeof(char*));
free(zones);
}
zones = zs;
}
zones[nzones++] = zone;
}
static int addzonefile(const char *fname) {
FILE *f = fopen(fname, "r");
char linebuf[2048];
if (!f)
return 0;
while(fgets(linebuf, sizeof(linebuf), f)) {
char *p = linebuf, *e;
while(*p == ' ' || *p == '\t') ++p;
if (*p == '#' || *p == '\n') continue;
e = p;
while(*e && *e != ' ' && *e != '\t' && *e != '\n')
++e;
*e++ = '\0';
p = memcpy(ecalloc(e - p, 1), p, e - p); // strdup
addzone(p);
}
fclose(f);
return 1;
}
static void dnserror(struct rblookup *ipl, const char *what) {
char buf[4*4];
error(0, "unable to %s for %s (%s): %s",
what, dns_ntop(AF_INET, &ipl->key, buf, sizeof(buf)),
ipl->zone, dns_strerror(dns_status(0)));
++failures;
}
static void display_result(struct ipcheck *ipc) {
int j;
struct rblookup *l, *le;
char buf[4*4];
if (!ipc->naddr) return;
for (l = ipc->lookup, le = l + nzones * ipc->naddr; l < le; ++l) {
if (!l->addr) continue;
if (verbose < 2 && l->addr == notlisted) continue;
if (verbose >= 0) {
dns_ntop(AF_INET, &l->key, buf, sizeof(buf));
if (ipc->name) printf("%s[%s]", ipc->name, buf);
else printf("%s", buf);
}
if (l->addr == notlisted) {
printf(" is NOT listed by %s\n", l->zone);
continue;
}
else if (verbose >= 1)
printf(" is listed by %s: ", l->zone);
else if (verbose >= 0)
printf(" %s ", l->zone);
if (verbose >= 1 || !do_txt)
for (j = 0; j < l->addr->dnsa4_nrr; ++j)
printf("%s%s", j ? " " : "",
dns_ntop(AF_INET, &l->addr->dnsa4_addr[j], buf, sizeof(buf)));
if (!do_txt) ;
else if (l->txt) {
for(j = 0; j < l->txt->dnstxt_nrr; ++j) {
unsigned char *t = l->txt->dnstxt_txt[j].txt;
unsigned char *e = t + l->txt->dnstxt_txt[j].len;
printf("%s\"", verbose > 0 ? "\n\t" : j ? " " : "");
while(t < e) {
if (*t < ' ' || *t >= 127) printf("\\x%02x", *t);
else if (*t == '\\' || *t == '"') printf("\\%c", *t);
else putchar(*t);
++t;
}
putchar('"');
}
free(l->txt);
}
else
printf("%s<no text available>", verbose > 0 ? "\n\t" : "");
free(l->addr);
putchar('\n');
}
free(ipc->lookup);
}
static void txtcb(struct dns_ctx *ctx, struct dns_rr_txt *r, void *data) {
struct rblookup *ipl = data;
if (r) {
ipl->txt = r;
++ipl->parent->listed;
}
else if (dns_status(ctx) != DNS_E_NXDOMAIN)
dnserror(ipl, "lookup DNSBL TXT record");
}
static void a4cb(struct dns_ctx *ctx, struct dns_rr_a4 *r, void *data) {
struct rblookup *ipl = data;
if (r) {
ipl->addr = r;
++listed;
if (do_txt) {
if (dns_submit_a4dnsbl_txt(0, &ipl->key, ipl->zone, txtcb, ipl))
return;
dnserror(ipl, "submit DNSBL TXT record");
}
++ipl->parent->listed;
}
else if (dns_status(ctx) != DNS_E_NXDOMAIN)
dnserror(ipl, "lookup DNSBL A record");
else
ipl->addr = notlisted;
}
static int
submit_a_queries(struct ipcheck *ipc,
int naddr, const struct in_addr *addr) {
int z, a;
struct rblookup *rl = ecalloc(sizeof(*rl), nzones * naddr);
ipc->lookup = rl;
ipc->naddr = naddr;
for(a = 0; a < naddr; ++a) {
for(z = 0; z < nzones; ++z) {
rl->key = addr[a];
rl->zone = zones[z];
rl->parent = ipc;
if (!dns_submit_a4dnsbl(0, &rl->key, rl->zone, a4cb, rl))
dnserror(rl, "submit DNSBL A query");
++rl;
}
}
return 0;
}
static void namecb(struct dns_ctx *ctx, struct dns_rr_a4 *rr, void *data) {
struct ipcheck *ipc = data;
if (rr) {
submit_a_queries(ipc, rr->dnsa4_nrr, rr->dnsa4_addr);
free(rr);
}
else {
error(0, "unable to lookup `%s': %s",
ipc->name, dns_strerror(dns_status(ctx)));
++failures;
}
}
static int submit(struct ipcheck *ipc) {
struct in_addr addr;
if (dns_pton(AF_INET, ipc->name, &addr) > 0) {
submit_a_queries(ipc, 1, &addr);
ipc->name = NULL;
}
else if (!dns_submit_a4(0, ipc->name, 0, namecb, ipc)) {
error(0, "unable to submit name query for %s: %s\n",
ipc->name, dns_strerror(dns_status(0)));
++failures;
}
return 0;
}
static void waitdns(struct ipcheck *ipc) {
struct timeval tv;
fd_set fds;
int c;
int fd = dns_sock(NULL);
time_t now = 0;
FD_ZERO(&fds);
while((c = dns_timeouts(NULL, -1, now)) > 0) {
FD_SET(fd, &fds);
tv.tv_sec = c;
tv.tv_usec = 0;
c = select(fd+1, &fds, NULL, NULL, &tv);
now = time(NULL);
if (c > 0)
dns_ioevent(NULL, now);
if (stopfirst && ipc->listed)
break;
}
}
int main(int argc, char **argv) {
int c;
struct ipcheck ipc;
char *nameserver = NULL;
int zgiven = 0;
if (!(progname = strrchr(argv[0], '/'))) progname = argv[0];
else argv[0] = ++progname;
while((c = getopt(argc, argv, "hqtvms:S:cn:")) != EOF) switch(c) {
case 's': ++zgiven; addzone(optarg); break;
case 'S':
++zgiven;
if (addzonefile(optarg)) break;
error(1, "unable to read zonefile `%s'", optarg);
case 'c': ++zgiven; nzones = 0; break;
case 'q': --verbose; break;
case 'v': ++verbose; break;
case 't': do_txt = 1; break;
case 'n': nameserver = optarg; break;
case 'm': ++stopfirst; break;
case 'h':
printf("%s: %s (udns library version %s).\n",
progname, version, dns_version());
printf("Usage is: %s [options] address..\n", progname);
printf(
"Where options are:\n"
" -h - print this help and exit\n"
" -s service - add the service (DNSBL zone) to the serice list\n"
" -S service-file - add the DNSBL zone(s) read from the given file\n"
" -c - clear service list\n"
" -v - increase verbosity level (more -vs => more verbose)\n"
" -q - decrease verbosity level (opposite of -v)\n"
" -t - obtain and print TXT records if any\n"
" -m - stop checking after first address match in any list\n"
" -n ipaddr - use the given nameserver instead of the default\n"
"(if no -s or -S option is given, use $RBLCHECK_ZONES, ~/.rblcheckrc\n"
"or /etc/rblcheckrc in that order)\n"
);
return 0;
default:
error(1, "use `%s -h' for help", progname);
}
if (!zgiven) {
char *s = getenv("RBLCHECK_ZONES");
if (s) {
char *k;
s = strdup(s);
for(k = strtok(s, " \t"); k; k = strtok(NULL, " \t"))
addzone(k);
free(s);
}
else { /* probably worthless on windows? */
char *path;
char *home = getenv("HOME");
if (!home) home = ".";
path = malloc(strlen(home) + 1 + sizeof(".rblcheckrc"));
sprintf(path, "%s/.rblcheckrc", home);
if (!addzonefile(path))
addzonefile("/etc/rblcheckrc");
free(path);
}
}
if (!nzones)
error(1, "no service (zone) list specified (-s or -S option)");
argv += optind;
argc -= optind;
if (!argc)
return 0;
if (dns_init(NULL, 0) < 0)
error(1, "unable to initialize DNS library: %s", strerror(errno));
if (nameserver) {
dns_add_serv(NULL, NULL);
if (dns_add_serv(NULL, nameserver) < 0)
error(1, "wrong IP address for a nameserver: `%s'", nameserver);
}
if (dns_open(NULL) < 0)
error(1, "unable to initialize DNS library: %s", strerror(errno));
for (c = 0; c < argc; ++c) {
if (c && (verbose > 1 || (verbose == 1 && do_txt))) putchar('\n');
memset(&ipc, 0, sizeof(ipc));
ipc.name = argv[c];
submit(&ipc);
waitdns(&ipc);
display_result(&ipc);
if (stopfirst > 1 && listed) break;
}
return listed ? 100 : failures ? 2 : 0;
}

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/* udns.h
header file for the UDNS library.
Copyright (C) 2005 Michael Tokarev <mjt@corpit.ru>
This file is part of UDNS library, an async DNS stub resolver.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library, in file named COPYING.LGPL; if not,
write to the Free Software Foundation, Inc., 59 Temple Place,
Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef UDNS_VERSION /* include guard */
#define UDNS_VERSION "0.4"
#ifdef WINDOWS
# ifdef UDNS_DYNAMIC_LIBRARY
# ifdef DNS_LIBRARY_BUILD
# define UDNS_API __declspec(dllexport)
# define UDNS_DATA_API __declspec(dllexport)
# else
# define UDNS_API __declspec(dllimport)
# define UDNS_DATA_API __declspec(dllimport)
# endif
# endif
#endif
#ifndef UDNS_API
# define UDNS_API
#endif
#ifndef UDNS_DATA_API
# define UDNS_DATA_API
#endif
#include <sys/types.h> /* for time_t */
#ifdef __cplusplus
extern "C" {
#endif
/* forward declarations if sockets stuff isn't #include'd */
struct in_addr;
struct in6_addr;
struct sockaddr;
/**************************************************************************/
/**************** Common definitions **************************************/
UDNS_API const char *
dns_version(void);
struct dns_ctx;
struct dns_query;
/* shorthand for [const] unsigned char */
typedef unsigned char dnsc_t;
typedef const unsigned char dnscc_t;
#define DNS_MAXDN 255 /* max DN length */
#define DNS_DNPAD 1 /* padding for DN buffers */
#define DNS_MAXLABEL 63 /* max DN label length */
#define DNS_MAXNAME 1024 /* max asciiz domain name length */
#define DNS_HSIZE 12 /* DNS packet header size */
#define DNS_PORT 53 /* default domain port */
#define DNS_MAXSERV 6 /* max servers to consult */
#define DNS_MAXPACKET 512 /* max traditional-DNS UDP packet size */
#define DNS_EDNS0PACKET 4096 /* EDNS0 packet size to use */
enum dns_class { /* DNS RR Classes */
DNS_C_INVALID = 0, /* invalid class */
DNS_C_IN = 1, /* Internet */
DNS_C_CH = 3, /* CHAOS */
DNS_C_HS = 4, /* HESIOD */
DNS_C_ANY = 255 /* wildcard */
};
enum dns_type { /* DNS RR Types */
DNS_T_INVALID = 0, /* Cookie. */
DNS_T_A = 1, /* Host address. */
DNS_T_NS = 2, /* Authoritative server. */
DNS_T_MD = 3, /* Mail destination. */
DNS_T_MF = 4, /* Mail forwarder. */
DNS_T_CNAME = 5, /* Canonical name. */
DNS_T_SOA = 6, /* Start of authority zone. */
DNS_T_MB = 7, /* Mailbox domain name. */
DNS_T_MG = 8, /* Mail group member. */
DNS_T_MR = 9, /* Mail rename name. */
DNS_T_NULL = 10, /* Null resource record. */
DNS_T_WKS = 11, /* Well known service. */
DNS_T_PTR = 12, /* Domain name pointer. */
DNS_T_HINFO = 13, /* Host information. */
DNS_T_MINFO = 14, /* Mailbox information. */
DNS_T_MX = 15, /* Mail routing information. */
DNS_T_TXT = 16, /* Text strings. */
DNS_T_RP = 17, /* Responsible person. */
DNS_T_AFSDB = 18, /* AFS cell database. */
DNS_T_X25 = 19, /* X_25 calling address. */
DNS_T_ISDN = 20, /* ISDN calling address. */
DNS_T_RT = 21, /* Router. */
DNS_T_NSAP = 22, /* NSAP address. */
DNS_T_NSAP_PTR = 23, /* Reverse NSAP lookup (deprecated). */
DNS_T_SIG = 24, /* Security signature. */
DNS_T_KEY = 25, /* Security key. */
DNS_T_PX = 26, /* X.400 mail mapping. */
DNS_T_GPOS = 27, /* Geographical position (withdrawn). */
DNS_T_AAAA = 28, /* Ip6 Address. */
DNS_T_LOC = 29, /* Location Information. */
DNS_T_NXT = 30, /* Next domain (security). */
DNS_T_EID = 31, /* Endpoint identifier. */
DNS_T_NIMLOC = 32, /* Nimrod Locator. */
DNS_T_SRV = 33, /* Server Selection. */
DNS_T_ATMA = 34, /* ATM Address */
DNS_T_NAPTR = 35, /* Naming Authority PoinTeR */
DNS_T_KX = 36, /* Key Exchange */
DNS_T_CERT = 37, /* Certification record */
DNS_T_A6 = 38, /* IPv6 address (deprecates AAAA) */
DNS_T_DNAME = 39, /* Non-terminal DNAME (for IPv6) */
DNS_T_SINK = 40, /* Kitchen sink (experimentatl) */
DNS_T_OPT = 41, /* EDNS0 option (meta-RR) */
DNS_T_DS = 43, /* DNSSEC */
DNS_T_SSHFP = 44,
DNS_T_IPSECKEY = 45,
DNS_T_RRSIG = 46, /* DNSSEC */
DNS_T_NSEC = 47, /* DNSSEC */
DNS_T_DNSKEY = 48,
DNS_T_DHCID = 49,
DNS_T_NSEC3 = 50,
DNS_T_NSEC3PARAMS = 51,
DNS_T_TALINK = 58, /* draft-ietf-dnsop-trust-history */
DNS_T_SPF = 99,
DNS_T_UINFO = 100,
DNS_T_UID = 101,
DNS_T_GID = 102,
DNS_T_UNSPEC = 103,
DNS_T_TSIG = 250, /* Transaction signature. */
DNS_T_IXFR = 251, /* Incremental zone transfer. */
DNS_T_AXFR = 252, /* Transfer zone of authority. */
DNS_T_MAILB = 253, /* Transfer mailbox records. */
DNS_T_MAILA = 254, /* Transfer mail agent records. */
DNS_T_ANY = 255, /* Wildcard match. */
DNS_T_ZXFR = 256, /* BIND-specific, nonstandard. */
DNS_T_DLV = 32769, /* RFC 4431, 5074, DNSSEC Lookaside Validation */
DNS_T_MAX = 65536
};
/**************************************************************************/
/**************** Domain Names (DNs) **************************************/
/* return length of the DN */
UDNS_API unsigned
dns_dnlen(dnscc_t *dn);
/* return #of labels in a DN */
UDNS_API unsigned
dns_dnlabels(dnscc_t *dn);
/* lower- and uppercase single DN char */
#define DNS_DNLC(c) ((c) >= 'A' && (c) <= 'Z' ? (c) - 'A' + 'a' : (c))
#define DNS_DNUC(c) ((c) >= 'a' && (c) <= 'z' ? (c) - 'a' + 'A' : (c))
/* compare the DNs, return dnlen of equal or 0 if not */
UDNS_API unsigned
dns_dnequal(dnscc_t *dn1, dnscc_t *dn2);
/* copy one DN to another, size checking */
UDNS_API unsigned
dns_dntodn(dnscc_t *sdn, dnsc_t *ddn, unsigned ddnsiz);
/* convert asciiz string of length namelen (0 to use strlen) to DN */
UDNS_API int
dns_ptodn(const char *name, unsigned namelen,
dnsc_t *dn, unsigned dnsiz, int *isabs);
/* simpler form of dns_ptodn() */
#define dns_sptodn(name,dn,dnsiz) dns_ptodn((name),0,(dn),(dnsiz),0)
UDNS_DATA_API extern dnscc_t dns_inaddr_arpa_dn[14];
#define DNS_A4RSIZE 30
UDNS_API int
dns_a4todn(const struct in_addr *addr, dnscc_t *tdn,
dnsc_t *dn, unsigned dnsiz);
UDNS_API int
dns_a4ptodn(const struct in_addr *addr, const char *tname,
dnsc_t *dn, unsigned dnsiz);
UDNS_API dnsc_t *
dns_a4todn_(const struct in_addr *addr, dnsc_t *dn, dnsc_t *dne);
UDNS_DATA_API extern dnscc_t dns_ip6_arpa_dn[10];
#define DNS_A6RSIZE 74
UDNS_API int
dns_a6todn(const struct in6_addr *addr, dnscc_t *tdn,
dnsc_t *dn, unsigned dnsiz);
UDNS_API int
dns_a6ptodn(const struct in6_addr *addr, const char *tname,
dnsc_t *dn, unsigned dnsiz);
UDNS_API dnsc_t *
dns_a6todn_(const struct in6_addr *addr, dnsc_t *dn, dnsc_t *dne);
/* convert DN into asciiz string */
UDNS_API int
dns_dntop(dnscc_t *dn, char *name, unsigned namesiz);
/* convert DN into asciiz string, using static buffer (NOT thread-safe!) */
UDNS_API const char *
dns_dntosp(dnscc_t *dn);
/* return buffer size (incl. null byte) required for asciiz form of a DN */
UDNS_API unsigned
dns_dntop_size(dnscc_t *dn);
/* either wrappers or reimplementations for inet_ntop() and inet_pton() */
UDNS_API const char *dns_ntop(int af, const void *src, char *dst, int size);
UDNS_API int dns_pton(int af, const char *src, void *dst);
/**************************************************************************/
/**************** DNS raw packet layout ***********************************/
enum dns_rcode { /* reply codes */
DNS_R_NOERROR = 0, /* ok, no error */
DNS_R_FORMERR = 1, /* format error */
DNS_R_SERVFAIL = 2, /* server failed */
DNS_R_NXDOMAIN = 3, /* domain does not exists */
DNS_R_NOTIMPL = 4, /* not implemented */
DNS_R_REFUSED = 5, /* query refused */
/* these are for BIND_UPDATE */
DNS_R_YXDOMAIN = 6, /* Name exists */
DNS_R_YXRRSET = 7, /* RRset exists */
DNS_R_NXRRSET = 8, /* RRset does not exist */
DNS_R_NOTAUTH = 9, /* Not authoritative for zone */
DNS_R_NOTZONE = 10, /* Zone of record different from zone section */
/*ns_r_max = 11,*/
/* The following are TSIG extended errors */
DNS_R_BADSIG = 16,
DNS_R_BADKEY = 17,
DNS_R_BADTIME = 18
};
static __inline unsigned dns_get16(dnscc_t *s) {
return ((unsigned)s[0]<<8) | s[1];
}
static __inline unsigned dns_get32(dnscc_t *s) {
return ((unsigned)s[0]<<24) | ((unsigned)s[1]<<16)
| ((unsigned)s[2]<<8) | s[3];
}
static __inline dnsc_t *dns_put16(dnsc_t *d, unsigned n) {
*d++ = (dnsc_t)((n >> 8) & 255); *d++ = (dnsc_t)(n & 255); return d;
}
static __inline dnsc_t *dns_put32(dnsc_t *d, unsigned n) {
*d++ = (dnsc_t)((n >> 24) & 255); *d++ = (dnsc_t)((n >> 16) & 255);
*d++ = (dnsc_t)((n >> 8) & 255); *d++ = (dnsc_t)(n & 255);
return d;
}
/* DNS Header layout */
enum {
/* bytes 0:1 - query ID */
DNS_H_QID1 = 0,
DNS_H_QID2 = 1,
DNS_H_QID = DNS_H_QID1,
#define dns_qid(pkt) dns_get16((pkt)+DNS_H_QID)
/* byte 2: flags1 */
DNS_H_F1 = 2,
DNS_HF1_QR = 0x80, /* query response flag */
#define dns_qr(pkt) ((pkt)[DNS_H_F1]&DNS_HF1_QR)
DNS_HF1_OPCODE = 0x78, /* opcode, 0 = query */
#define dns_opcode(pkt) (((pkt)[DNS_H_F1]&DNS_HF1_OPCODE)>>3)
DNS_HF1_AA = 0x04, /* auth answer */
#define dns_aa(pkt) ((pkt)[DNS_H_F1]&DNS_HF1_AA)
DNS_HF1_TC = 0x02, /* truncation flag */
#define dns_tc(pkt) ((pkt)[DNS_H_F1]&DNS_HF1_TC)
DNS_HF1_RD = 0x01, /* recursion desired (may be set in query) */
#define dns_rd(pkt) ((pkt)[DNS_H_F1]&DNS_HF1_RD)
/* byte 3: flags2 */
DNS_H_F2 = 3,
DNS_HF2_RA = 0x80, /* recursion available */
#define dns_ra(pkt) ((pkt)[DNS_H_F2]&DNS_HF2_RA)
DNS_HF2_Z = 0x40, /* reserved */
DNS_HF2_AD = 0x20, /* DNSSEC: authentic data */
#define dns_ad(pkt) ((pkt)[DNS_H_F2]&DNS_HF2_AD)
DNS_HF2_CD = 0x10, /* DNSSEC: checking disabled */
#define dns_cd(pkt) ((pkt)[DNS_H_F2]&DNS_HF2_CD)
DNS_HF2_RCODE = 0x0f, /* response code, DNS_R_XXX above */
#define dns_rcode(pkt) ((pkt)[DNS_H_F2]&DNS_HF2_RCODE)
/* bytes 4:5: qdcount, numqueries */
DNS_H_QDCNT1 = 4,
DNS_H_QDCNT2 = 5,
DNS_H_QDCNT = DNS_H_QDCNT1,
#define dns_numqd(pkt) dns_get16((pkt)+4)
/* bytes 6:7: ancount, numanswers */
DNS_H_ANCNT1 = 6,
DNS_H_ANCNT2 = 7,
DNS_H_ANCNT = DNS_H_ANCNT1,
#define dns_numan(pkt) dns_get16((pkt)+6)
/* bytes 8:9: nscount, numauthority */
DNS_H_NSCNT1 = 8,
DNS_H_NSCNT2 = 9,
DNS_H_NSCNT = DNS_H_NSCNT1,
#define dns_numns(pkt) dns_get16((pkt)+8)
/* bytes 10:11: arcount, numadditional */
DNS_H_ARCNT1 = 10,
DNS_H_ARCNT2 = 11,
DNS_H_ARCNT = DNS_H_ARCNT1,
#define dns_numar(pkt) dns_get16((pkt)+10)
#define dns_payload(pkt) ((pkt)+DNS_HSIZE)
/* EDNS0 (OPT RR) flags (Ext. Flags) */
DNS_EF1_DO = 0x80, /* DNSSEC OK */
};
/* packet buffer: start at pkt, end before pkte, current pos *curp.
* extract a DN and set *curp to the next byte after DN in packet.
* return -1 on error, 0 if dnsiz is too small, or dnlen on ok.
*/
UDNS_API int
dns_getdn(dnscc_t *pkt, dnscc_t **curp, dnscc_t *end,
dnsc_t *dn, unsigned dnsiz);
/* skip the DN at position cur in packet ending before pkte,
* return pointer to the next byte after the DN or NULL on error */
UDNS_API dnscc_t *
dns_skipdn(dnscc_t *end, dnscc_t *cur);
struct dns_rr { /* DNS Resource Record */
dnsc_t dnsrr_dn[DNS_MAXDN]; /* the DN of the RR */
enum dns_class dnsrr_cls; /* Class */
enum dns_type dnsrr_typ; /* Type */
unsigned dnsrr_ttl; /* Time-To-Live (TTL) */
unsigned dnsrr_dsz; /* data size */
dnscc_t *dnsrr_dptr; /* pointer to start of data */
dnscc_t *dnsrr_dend; /* past end of data */
};
struct dns_parse { /* RR/packet parsing state */
dnscc_t *dnsp_pkt; /* start of the packet */
dnscc_t *dnsp_end; /* end of the packet */
dnscc_t *dnsp_cur; /* current packet position */
dnscc_t *dnsp_ans; /* start of answer section */
int dnsp_rrl; /* number of RRs left to go */
int dnsp_nrr; /* RR count so far */
unsigned dnsp_ttl; /* TTL value so far */
dnscc_t *dnsp_qdn; /* the RR DN we're looking for */
enum dns_class dnsp_qcls; /* RR class we're looking for or 0 */
enum dns_type dnsp_qtyp; /* RR type we're looking for or 0 */
dnsc_t dnsp_dnbuf[DNS_MAXDN]; /* domain buffer */
};
/* initialize the parse structure */
UDNS_API void
dns_initparse(struct dns_parse *p, dnscc_t *qdn,
dnscc_t *pkt, dnscc_t *cur, dnscc_t *end);
/* search next RR, <0=error, 0=no more RRs, >0 = found. */
UDNS_API int
dns_nextrr(struct dns_parse *p, struct dns_rr *rr);
UDNS_API void
dns_rewind(struct dns_parse *p, dnscc_t *qdn);
/**************************************************************************/
/**************** Resolver Context ****************************************/
/* default resolver context */
UDNS_DATA_API extern struct dns_ctx dns_defctx;
/* reset resolver context to default state, close it if open, drop queries */
UDNS_API void
dns_reset(struct dns_ctx *ctx);
/* reset resolver context and read in system configuration */
UDNS_API int
dns_init(struct dns_ctx *ctx, int do_open);
/* return new resolver context with the same settings as copy */
UDNS_API struct dns_ctx *
dns_new(const struct dns_ctx *copy);
/* free resolver context returned by dns_new(); all queries are dropped */
UDNS_API void
dns_free(struct dns_ctx *ctx);
/* add nameserver for a resolver context (or reset nslist if serv==NULL) */
UDNS_API int
dns_add_serv(struct dns_ctx *ctx, const char *serv);
/* add nameserver using struct sockaddr structure (with ports) */
UDNS_API int
dns_add_serv_s(struct dns_ctx *ctx, const struct sockaddr *sa);
/* add search list element for a resolver context (or reset it if srch==NULL) */
UDNS_API int
dns_add_srch(struct dns_ctx *ctx, const char *srch);
/* set options for a resolver context */
UDNS_API int
dns_set_opts(struct dns_ctx *ctx, const char *opts);
enum dns_opt { /* options */
DNS_OPT_FLAGS, /* flags, DNS_F_XXX */
DNS_OPT_TIMEOUT, /* timeout in secounds */
DNS_OPT_NTRIES, /* number of retries */
DNS_OPT_NDOTS, /* ndots */
DNS_OPT_UDPSIZE, /* EDNS0 UDP size */
DNS_OPT_PORT, /* port to use */
};
/* set or get (if val<0) an option */
UDNS_API int
dns_set_opt(struct dns_ctx *ctx, enum dns_opt opt, int val);
enum dns_flags {
DNS_NOSRCH = 0x00010000, /* do not perform search */
DNS_NORD = 0x00020000, /* request no recursion */
DNS_AAONLY = 0x00040000, /* set AA flag in queries */
DNS_SET_DO = 0x00080000, /* set EDNS0 "DO" bit (DNSSEC OK) */
DNS_SET_CD = 0x00100000, /* set CD bit (DNSSEC: checking disabled) */
};
/* set the debug function pointer */
typedef void
(dns_dbgfn)(int code, const struct sockaddr *sa, unsigned salen,
dnscc_t *pkt, int plen,
const struct dns_query *q, void *data);
UDNS_API void
dns_set_dbgfn(struct dns_ctx *ctx, dns_dbgfn *dbgfn);
/* open and return UDP socket */
UDNS_API int
dns_open(struct dns_ctx *ctx);
/* return UDP socket or -1 if not open */
UDNS_API int
dns_sock(const struct dns_ctx *ctx);
/* close the UDP socket */
UDNS_API void
dns_close(struct dns_ctx *ctx);
/* return number of requests queued */
UDNS_API int
dns_active(const struct dns_ctx *ctx);
/* return status of the last operation */
UDNS_API int
dns_status(const struct dns_ctx *ctx);
UDNS_API void
dns_setstatus(struct dns_ctx *ctx, int status);
/* handle I/O event on UDP socket */
UDNS_API void
dns_ioevent(struct dns_ctx *ctx, time_t now);
/* process any timeouts, return time in secounds to the
* next timeout (or -1 if none) but not greather than maxwait */
UDNS_API int
dns_timeouts(struct dns_ctx *ctx, int maxwait, time_t now);
/* define timer requesting routine to use */
typedef void dns_utm_fn(struct dns_ctx *ctx, int timeout, void *data);
UDNS_API void
dns_set_tmcbck(struct dns_ctx *ctx, dns_utm_fn *fn, void *data);
/**************************************************************************/
/**************** Making Queries ******************************************/
/* query callback routine */
typedef void dns_query_fn(struct dns_ctx *ctx, void *result, void *data);
/* query parse routine: raw DNS => application structure */
typedef int
dns_parse_fn(dnscc_t *qdn, dnscc_t *pkt, dnscc_t *cur, dnscc_t *end,
void **res);
enum dns_status {
DNS_E_NOERROR = 0, /* ok, not an error */
DNS_E_TEMPFAIL = -1, /* timeout, SERVFAIL or similar */
DNS_E_PROTOCOL = -2, /* got garbled reply */
DNS_E_NXDOMAIN = -3, /* domain does not exists */
DNS_E_NODATA = -4, /* domain exists but no data of reqd type */
DNS_E_NOMEM = -5, /* out of memory while processing */
DNS_E_BADQUERY = -6 /* the query is malformed */
};
/* submit generic DN query */
UDNS_API struct dns_query *
dns_submit_dn(struct dns_ctx *ctx,
dnscc_t *dn, int qcls, int qtyp, int flags,
dns_parse_fn *parse, dns_query_fn *cbck, void *data);
/* submit generic name query */
UDNS_API struct dns_query *
dns_submit_p(struct dns_ctx *ctx,
const char *name, int qcls, int qtyp, int flags,
dns_parse_fn *parse, dns_query_fn *cbck, void *data);
/* cancel the given async query in progress */
UDNS_API int
dns_cancel(struct dns_ctx *ctx, struct dns_query *q);
/* resolve a generic query, return the answer */
UDNS_API void *
dns_resolve_dn(struct dns_ctx *ctx,
dnscc_t *qdn, int qcls, int qtyp, int flags,
dns_parse_fn *parse);
UDNS_API void *
dns_resolve_p(struct dns_ctx *ctx,
const char *qname, int qcls, int qtyp, int flags,
dns_parse_fn *parse);
UDNS_API void *
dns_resolve(struct dns_ctx *ctx, struct dns_query *q);
/* Specific RR handlers */
#define dns_rr_common(prefix) \
char *prefix##_cname; /* canonical name */ \
char *prefix##_qname; /* original query name */ \
unsigned prefix##_ttl; /* TTL value */ \
int prefix##_nrr /* number of records */
struct dns_rr_null { /* NULL RRset, aka RRset template */
dns_rr_common(dnsn);
};
UDNS_API int
dns_stdrr_size(const struct dns_parse *p);
UDNS_API void *
dns_stdrr_finish(struct dns_rr_null *ret, char *cp, const struct dns_parse *p);
struct dns_rr_a4 { /* the A RRset */
dns_rr_common(dnsa4);
struct in_addr *dnsa4_addr; /* array of addresses, naddr elements */
};
UDNS_API dns_parse_fn dns_parse_a4; /* A RR parsing routine */
typedef void /* A query callback routine */
dns_query_a4_fn(struct dns_ctx *ctx, struct dns_rr_a4 *result, void *data);
/* submit A IN query */
UDNS_API struct dns_query *
dns_submit_a4(struct dns_ctx *ctx, const char *name, int flags,
dns_query_a4_fn *cbck, void *data);
/* resolve A IN query */
UDNS_API struct dns_rr_a4 *
dns_resolve_a4(struct dns_ctx *ctx, const char *name, int flags);
struct dns_rr_a6 { /* the AAAA RRset */
dns_rr_common(dnsa6);
struct in6_addr *dnsa6_addr; /* array of addresses, naddr elements */
};
UDNS_API dns_parse_fn dns_parse_a6; /* A RR parsing routine */
typedef void /* A query callback routine */
dns_query_a6_fn(struct dns_ctx *ctx, struct dns_rr_a6 *result, void *data);
/* submit AAAA IN query */
UDNS_API struct dns_query *
dns_submit_a6(struct dns_ctx *ctx, const char *name, int flags,
dns_query_a6_fn *cbck, void *data);
/* resolve AAAA IN query */
UDNS_API struct dns_rr_a6 *
dns_resolve_a6(struct dns_ctx *ctx, const char *name, int flags);
struct dns_rr_ptr { /* the PTR RRset */
dns_rr_common(dnsptr);
char **dnsptr_ptr; /* array of PTRs */
};
UDNS_API dns_parse_fn dns_parse_ptr; /* PTR RR parsing routine */
typedef void /* PTR query callback */
dns_query_ptr_fn(struct dns_ctx *ctx, struct dns_rr_ptr *result, void *data);
/* submit PTR IN in-addr.arpa query */
UDNS_API struct dns_query *
dns_submit_a4ptr(struct dns_ctx *ctx, const struct in_addr *addr,
dns_query_ptr_fn *cbck, void *data);
/* resolve PTR IN in-addr.arpa query */
UDNS_API struct dns_rr_ptr *
dns_resolve_a4ptr(struct dns_ctx *ctx, const struct in_addr *addr);
/* the same as above, but for ip6.arpa */
UDNS_API struct dns_query *
dns_submit_a6ptr(struct dns_ctx *ctx, const struct in6_addr *addr,
dns_query_ptr_fn *cbck, void *data);
UDNS_API struct dns_rr_ptr *
dns_resolve_a6ptr(struct dns_ctx *ctx, const struct in6_addr *addr);
struct dns_mx { /* single MX RR */
int priority; /* MX priority */
char *name; /* MX name */
};
struct dns_rr_mx { /* the MX RRset */
dns_rr_common(dnsmx);
struct dns_mx *dnsmx_mx; /* array of MXes */
};
UDNS_API dns_parse_fn dns_parse_mx; /* MX RR parsing routine */
typedef void /* MX RR callback */
dns_query_mx_fn(struct dns_ctx *ctx, struct dns_rr_mx *result, void *data);
/* submit MX IN query */
UDNS_API struct dns_query *
dns_submit_mx(struct dns_ctx *ctx, const char *name, int flags,
dns_query_mx_fn *cbck, void *data);
/* resolve MX IN query */
UDNS_API struct dns_rr_mx *
dns_resolve_mx(struct dns_ctx *ctx, const char *name, int flags);
struct dns_txt { /* single TXT record */
int len; /* length of the text */
dnsc_t *txt; /* pointer to text buffer. May contain nulls. */
};
struct dns_rr_txt { /* the TXT RRset */
dns_rr_common(dnstxt);
struct dns_txt *dnstxt_txt; /* array of TXT records */
};
UDNS_API dns_parse_fn dns_parse_txt; /* TXT RR parsing routine */
typedef void /* TXT RR callback */
dns_query_txt_fn(struct dns_ctx *ctx, struct dns_rr_txt *result, void *data);
/* submit TXT query */
UDNS_API struct dns_query *
dns_submit_txt(struct dns_ctx *ctx, const char *name, int qcls, int flags,
dns_query_txt_fn *cbck, void *data);
/* resolve TXT query */
UDNS_API struct dns_rr_txt *
dns_resolve_txt(struct dns_ctx *ctx, const char *name, int qcls, int flags);
struct dns_srv { /* single SRV RR */
int priority; /* SRV priority */
int weight; /* SRV weight */
int port; /* SRV port */
char *name; /* SRV name */
};
struct dns_rr_srv { /* the SRV RRset */
dns_rr_common(dnssrv);
struct dns_srv *dnssrv_srv; /* array of SRVes */
};
UDNS_API dns_parse_fn dns_parse_srv; /* SRV RR parsing routine */
typedef void /* SRV RR callback */
dns_query_srv_fn(struct dns_ctx *ctx, struct dns_rr_srv *result, void *data);
/* submit SRV IN query */
UDNS_API struct dns_query *
dns_submit_srv(struct dns_ctx *ctx,
const char *name, const char *srv, const char *proto,
int flags, dns_query_srv_fn *cbck, void *data);
/* resolve SRV IN query */
UDNS_API struct dns_rr_srv *
dns_resolve_srv(struct dns_ctx *ctx,
const char *name, const char *srv, const char *proto,
int flags);
/* NAPTR (RFC3403) RR type */
struct dns_naptr { /* single NAPTR RR */
int order; /* NAPTR order */
int preference; /* NAPTR preference */
char *flags; /* NAPTR flags */
char *service; /* NAPTR service */
char *regexp; /* NAPTR regexp */
char *replacement; /* NAPTR replacement */
};
struct dns_rr_naptr { /* the NAPTR RRset */
dns_rr_common(dnsnaptr);
struct dns_naptr *dnsnaptr_naptr; /* array of NAPTRes */
};
UDNS_API dns_parse_fn dns_parse_naptr; /* NAPTR RR parsing routine */
typedef void /* NAPTR RR callback */
dns_query_naptr_fn(struct dns_ctx *ctx,
struct dns_rr_naptr *result, void *data);
/* submit NAPTR IN query */
UDNS_API struct dns_query *
dns_submit_naptr(struct dns_ctx *ctx, const char *name, int flags,
dns_query_naptr_fn *cbck, void *data);
/* resolve NAPTR IN query */
UDNS_API struct dns_rr_naptr *
dns_resolve_naptr(struct dns_ctx *ctx, const char *name, int flags);
UDNS_API struct dns_query *
dns_submit_a4dnsbl(struct dns_ctx *ctx,
const struct in_addr *addr, const char *dnsbl,
dns_query_a4_fn *cbck, void *data);
UDNS_API struct dns_query *
dns_submit_a4dnsbl_txt(struct dns_ctx *ctx,
const struct in_addr *addr, const char *dnsbl,
dns_query_txt_fn *cbck, void *data);
UDNS_API struct dns_rr_a4 *
dns_resolve_a4dnsbl(struct dns_ctx *ctx,
const struct in_addr *addr, const char *dnsbl);
UDNS_API struct dns_rr_txt *
dns_resolve_a4dnsbl_txt(struct dns_ctx *ctx,
const struct in_addr *addr, const char *dnsbl);
UDNS_API struct dns_query *
dns_submit_a6dnsbl(struct dns_ctx *ctx,
const struct in6_addr *addr, const char *dnsbl,
dns_query_a4_fn *cbck, void *data);
UDNS_API struct dns_query *
dns_submit_a6dnsbl_txt(struct dns_ctx *ctx,
const struct in6_addr *addr, const char *dnsbl,
dns_query_txt_fn *cbck, void *data);
UDNS_API struct dns_rr_a4 *
dns_resolve_a6dnsbl(struct dns_ctx *ctx,
const struct in6_addr *addr, const char *dnsbl);
UDNS_API struct dns_rr_txt *
dns_resolve_a6dnsbl_txt(struct dns_ctx *ctx,
const struct in6_addr *addr, const char *dnsbl);
UDNS_API struct dns_query *
dns_submit_rhsbl(struct dns_ctx *ctx,
const char *name, const char *rhsbl,
dns_query_a4_fn *cbck, void *data);
UDNS_API struct dns_query *
dns_submit_rhsbl_txt(struct dns_ctx *ctx,
const char *name, const char *rhsbl,
dns_query_txt_fn *cbck, void *data);
UDNS_API struct dns_rr_a4 *
dns_resolve_rhsbl(struct dns_ctx *ctx, const char *name, const char *rhsbl);
UDNS_API struct dns_rr_txt *
dns_resolve_rhsbl_txt(struct dns_ctx *ctx, const char *name, const char *rhsbl);
/**************************************************************************/
/**************** Names, Names ********************************************/
struct dns_nameval {
int val;
const char *name;
};
UDNS_DATA_API extern const struct dns_nameval dns_classtab[];
UDNS_DATA_API extern const struct dns_nameval dns_typetab[];
UDNS_DATA_API extern const struct dns_nameval dns_rcodetab[];
UDNS_API int
dns_findname(const struct dns_nameval *nv, const char *name);
#define dns_findclassname(cls) dns_findname(dns_classtab, (cls))
#define dns_findtypename(type) dns_findname(dns_typetab, (type))
#define dns_findrcodename(rcode) dns_findname(dns_rcodetab, (rcode))
UDNS_API const char *dns_classname(enum dns_class cls);
UDNS_API const char *dns_typename(enum dns_type type);
UDNS_API const char *dns_rcodename(enum dns_rcode rcode);
const char *_dns_format_code(char *buf, const char *prefix, int code);
UDNS_API const char *dns_strerror(int errnum);
/* simple pseudo-random number generator, code by Bob Jenkins */
struct udns_jranctx { /* the context */
unsigned a, b, c, d;
};
/* initialize the RNG with a given seed */
UDNS_API void
udns_jraninit(struct udns_jranctx *x, unsigned seed);
/* return next random number. 32bits on most platforms so far. */
UDNS_API unsigned
udns_jranval(struct udns_jranctx *x);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* include guard */

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/* udns_XtoX.c
udns_ntop() and udns_pton() routines, which are either
- wrappers for inet_ntop() and inet_pton() or
- reimplementations of those routines.
Copyright (C) 2005 Michael Tokarev <mjt@corpit.ru>
This file is part of UDNS library, an async DNS stub resolver.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library, in file named COPYING.LGPL; if not,
write to the Free Software Foundation, Inc., 59 Temple Place,
Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "udns.h"
#ifdef HAVE_INET_PTON_NTOP
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
const char *dns_ntop(int af, const void *src, char *dst, int size) {
return inet_ntop(af, src, dst, size);
}
int dns_pton(int af, const char *src, void *dst) {
return inet_pton(af, src, dst);
}
#else
#define inet_XtoX_prefix udns_
#include "inet_XtoX.c"
#endif

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/* udns_bl.c
DNSBL stuff
Copyright (C) 2005 Michael Tokarev <mjt@corpit.ru>
This file is part of UDNS library, an async DNS stub resolver.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library, in file named COPYING.LGPL; if not,
write to the Free Software Foundation, Inc., 59 Temple Place,
Suite 330, Boston, MA 02111-1307 USA
*/
#include "udns.h"
#ifndef NULL
# define NULL 0
#endif
struct dns_query *
dns_submit_a4dnsbl(struct dns_ctx *ctx,
const struct in_addr *addr, const char *dnsbl,
dns_query_a4_fn *cbck, void *data) {
dnsc_t dn[DNS_MAXDN];
if (dns_a4ptodn(addr, dnsbl, dn, sizeof(dn)) <= 0) {
dns_setstatus(ctx, DNS_E_BADQUERY);
return NULL;
}
return
dns_submit_dn(ctx, dn, DNS_C_IN, DNS_T_A, DNS_NOSRCH,
dns_parse_a4, (dns_query_fn*)cbck, data);
}
struct dns_query *
dns_submit_a4dnsbl_txt(struct dns_ctx *ctx,
const struct in_addr *addr, const char *dnsbl,
dns_query_txt_fn *cbck, void *data) {
dnsc_t dn[DNS_MAXDN];
if (dns_a4ptodn(addr, dnsbl, dn, sizeof(dn)) <= 0) {
dns_setstatus(ctx, DNS_E_BADQUERY);
return NULL;
}
return
dns_submit_dn(ctx, dn, DNS_C_IN, DNS_T_TXT, DNS_NOSRCH,
dns_parse_txt, (dns_query_fn*)cbck, data);
}
struct dns_rr_a4 *
dns_resolve_a4dnsbl(struct dns_ctx *ctx,
const struct in_addr *addr, const char *dnsbl) {
return (struct dns_rr_a4 *)
dns_resolve(ctx, dns_submit_a4dnsbl(ctx, addr, dnsbl, 0, 0));
}
struct dns_rr_txt *
dns_resolve_a4dnsbl_txt(struct dns_ctx *ctx,
const struct in_addr *addr, const char *dnsbl) {
return (struct dns_rr_txt *)
dns_resolve(ctx, dns_submit_a4dnsbl_txt(ctx, addr, dnsbl, 0, 0));
}
struct dns_query *
dns_submit_a6dnsbl(struct dns_ctx *ctx,
const struct in6_addr *addr, const char *dnsbl,
dns_query_a4_fn *cbck, void *data) {
dnsc_t dn[DNS_MAXDN];
if (dns_a6ptodn(addr, dnsbl, dn, sizeof(dn)) <= 0) {
dns_setstatus(ctx, DNS_E_BADQUERY);
return NULL;
}
return
dns_submit_dn(ctx, dn, DNS_C_IN, DNS_T_A, DNS_NOSRCH,
dns_parse_a4, (dns_query_fn*)cbck, data);
}
struct dns_query *
dns_submit_a6dnsbl_txt(struct dns_ctx *ctx,
const struct in6_addr *addr, const char *dnsbl,
dns_query_txt_fn *cbck, void *data) {
dnsc_t dn[DNS_MAXDN];
if (dns_a6ptodn(addr, dnsbl, dn, sizeof(dn)) <= 0) {
dns_setstatus(ctx, DNS_E_BADQUERY);
return NULL;
}
return
dns_submit_dn(ctx, dn, DNS_C_IN, DNS_T_TXT, DNS_NOSRCH,
dns_parse_txt, (dns_query_fn*)cbck, data);
}
struct dns_rr_a4 *
dns_resolve_a6dnsbl(struct dns_ctx *ctx,
const struct in6_addr *addr, const char *dnsbl) {
return (struct dns_rr_a4 *)
dns_resolve(ctx, dns_submit_a6dnsbl(ctx, addr, dnsbl, 0, 0));
}
struct dns_rr_txt *
dns_resolve_a6dnsbl_txt(struct dns_ctx *ctx,
const struct in6_addr *addr, const char *dnsbl) {
return (struct dns_rr_txt *)
dns_resolve(ctx, dns_submit_a6dnsbl_txt(ctx, addr, dnsbl, 0, 0));
}
static int
dns_rhsbltodn(const char *name, const char *rhsbl, dnsc_t dn[DNS_MAXDN])
{
int l = dns_sptodn(name, dn, DNS_MAXDN);
if (l <= 0) return 0;
l = dns_sptodn(rhsbl, dn+l-1, DNS_MAXDN-l+1);
if (l <= 0) return 0;
return 1;
}
struct dns_query *
dns_submit_rhsbl(struct dns_ctx *ctx, const char *name, const char *rhsbl,
dns_query_a4_fn *cbck, void *data) {
dnsc_t dn[DNS_MAXDN];
if (!dns_rhsbltodn(name, rhsbl, dn)) {
dns_setstatus(ctx, DNS_E_BADQUERY);
return NULL;
}
return
dns_submit_dn(ctx, dn, DNS_C_IN, DNS_T_A, DNS_NOSRCH,
dns_parse_a4, (dns_query_fn*)cbck, data);
}
struct dns_query *
dns_submit_rhsbl_txt(struct dns_ctx *ctx, const char *name, const char *rhsbl,
dns_query_txt_fn *cbck, void *data) {
dnsc_t dn[DNS_MAXDN];
if (!dns_rhsbltodn(name, rhsbl, dn)) {
dns_setstatus(ctx, DNS_E_BADQUERY);
return NULL;
}
return
dns_submit_dn(ctx, dn, DNS_C_IN, DNS_T_TXT, DNS_NOSRCH,
dns_parse_txt, (dns_query_fn*)cbck, data);
}
struct dns_rr_a4 *
dns_resolve_rhsbl(struct dns_ctx *ctx, const char *name, const char *rhsbl) {
return (struct dns_rr_a4*)
dns_resolve(ctx, dns_submit_rhsbl(ctx, name, rhsbl, 0, 0));
}
struct dns_rr_txt *
dns_resolve_rhsbl_txt(struct dns_ctx *ctx, const char *name, const char *rhsbl)
{
return (struct dns_rr_txt*)
dns_resolve(ctx, dns_submit_rhsbl_txt(ctx, name, rhsbl, 0, 0));
}

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/* Automatically generated. */
#include "udns.h"
const struct dns_nameval dns_typetab[] = {
{DNS_T_INVALID,"INVALID"},
{DNS_T_A,"A"},
{DNS_T_NS,"NS"},
{DNS_T_MD,"MD"},
{DNS_T_MF,"MF"},
{DNS_T_CNAME,"CNAME"},
{DNS_T_SOA,"SOA"},
{DNS_T_MB,"MB"},
{DNS_T_MG,"MG"},
{DNS_T_MR,"MR"},
{DNS_T_NULL,"NULL"},
{DNS_T_WKS,"WKS"},
{DNS_T_PTR,"PTR"},
{DNS_T_HINFO,"HINFO"},
{DNS_T_MINFO,"MINFO"},
{DNS_T_MX,"MX"},
{DNS_T_TXT,"TXT"},
{DNS_T_RP,"RP"},
{DNS_T_AFSDB,"AFSDB"},
{DNS_T_X25,"X25"},
{DNS_T_ISDN,"ISDN"},
{DNS_T_RT,"RT"},
{DNS_T_NSAP,"NSAP"},
{DNS_T_NSAP_PTR,"NSAP_PTR"},
{DNS_T_SIG,"SIG"},
{DNS_T_KEY,"KEY"},
{DNS_T_PX,"PX"},
{DNS_T_GPOS,"GPOS"},
{DNS_T_AAAA,"AAAA"},
{DNS_T_LOC,"LOC"},
{DNS_T_NXT,"NXT"},
{DNS_T_EID,"EID"},
{DNS_T_NIMLOC,"NIMLOC"},
{DNS_T_SRV,"SRV"},
{DNS_T_ATMA,"ATMA"},
{DNS_T_NAPTR,"NAPTR"},
{DNS_T_KX,"KX"},
{DNS_T_CERT,"CERT"},
{DNS_T_A6,"A6"},
{DNS_T_DNAME,"DNAME"},
{DNS_T_SINK,"SINK"},
{DNS_T_OPT,"OPT"},
{DNS_T_DS,"DS"},
{DNS_T_SSHFP,"SSHFP"},
{DNS_T_IPSECKEY,"IPSECKEY"},
{DNS_T_RRSIG,"RRSIG"},
{DNS_T_NSEC,"NSEC"},
{DNS_T_DNSKEY,"DNSKEY"},
{DNS_T_DHCID,"DHCID"},
{DNS_T_NSEC3,"NSEC3"},
{DNS_T_NSEC3PARAMS,"NSEC3PARAMS"},
{DNS_T_TALINK,"TALINK"},
{DNS_T_SPF,"SPF"},
{DNS_T_UINFO,"UINFO"},
{DNS_T_UID,"UID"},
{DNS_T_GID,"GID"},
{DNS_T_UNSPEC,"UNSPEC"},
{DNS_T_TSIG,"TSIG"},
{DNS_T_IXFR,"IXFR"},
{DNS_T_AXFR,"AXFR"},
{DNS_T_MAILB,"MAILB"},
{DNS_T_MAILA,"MAILA"},
{DNS_T_ANY,"ANY"},
{DNS_T_ZXFR,"ZXFR"},
{DNS_T_DLV,"DLV"},
{DNS_T_MAX,"MAX"},
{0,0}};
const char *dns_typename(enum dns_type code) {
static char nm[20];
switch(code) {
case DNS_T_INVALID: return dns_typetab[0].name;
case DNS_T_A: return dns_typetab[1].name;
case DNS_T_NS: return dns_typetab[2].name;
case DNS_T_MD: return dns_typetab[3].name;
case DNS_T_MF: return dns_typetab[4].name;
case DNS_T_CNAME: return dns_typetab[5].name;
case DNS_T_SOA: return dns_typetab[6].name;
case DNS_T_MB: return dns_typetab[7].name;
case DNS_T_MG: return dns_typetab[8].name;
case DNS_T_MR: return dns_typetab[9].name;
case DNS_T_NULL: return dns_typetab[10].name;
case DNS_T_WKS: return dns_typetab[11].name;
case DNS_T_PTR: return dns_typetab[12].name;
case DNS_T_HINFO: return dns_typetab[13].name;
case DNS_T_MINFO: return dns_typetab[14].name;
case DNS_T_MX: return dns_typetab[15].name;
case DNS_T_TXT: return dns_typetab[16].name;
case DNS_T_RP: return dns_typetab[17].name;
case DNS_T_AFSDB: return dns_typetab[18].name;
case DNS_T_X25: return dns_typetab[19].name;
case DNS_T_ISDN: return dns_typetab[20].name;
case DNS_T_RT: return dns_typetab[21].name;
case DNS_T_NSAP: return dns_typetab[22].name;
case DNS_T_NSAP_PTR: return dns_typetab[23].name;
case DNS_T_SIG: return dns_typetab[24].name;
case DNS_T_KEY: return dns_typetab[25].name;
case DNS_T_PX: return dns_typetab[26].name;
case DNS_T_GPOS: return dns_typetab[27].name;
case DNS_T_AAAA: return dns_typetab[28].name;
case DNS_T_LOC: return dns_typetab[29].name;
case DNS_T_NXT: return dns_typetab[30].name;
case DNS_T_EID: return dns_typetab[31].name;
case DNS_T_NIMLOC: return dns_typetab[32].name;
case DNS_T_SRV: return dns_typetab[33].name;
case DNS_T_ATMA: return dns_typetab[34].name;
case DNS_T_NAPTR: return dns_typetab[35].name;
case DNS_T_KX: return dns_typetab[36].name;
case DNS_T_CERT: return dns_typetab[37].name;
case DNS_T_A6: return dns_typetab[38].name;
case DNS_T_DNAME: return dns_typetab[39].name;
case DNS_T_SINK: return dns_typetab[40].name;
case DNS_T_OPT: return dns_typetab[41].name;
case DNS_T_DS: return dns_typetab[42].name;
case DNS_T_SSHFP: return dns_typetab[43].name;
case DNS_T_IPSECKEY: return dns_typetab[44].name;
case DNS_T_RRSIG: return dns_typetab[45].name;
case DNS_T_NSEC: return dns_typetab[46].name;
case DNS_T_DNSKEY: return dns_typetab[47].name;
case DNS_T_DHCID: return dns_typetab[48].name;
case DNS_T_NSEC3: return dns_typetab[49].name;
case DNS_T_NSEC3PARAMS: return dns_typetab[50].name;
case DNS_T_TALINK: return dns_typetab[51].name;
case DNS_T_SPF: return dns_typetab[52].name;
case DNS_T_UINFO: return dns_typetab[53].name;
case DNS_T_UID: return dns_typetab[54].name;
case DNS_T_GID: return dns_typetab[55].name;
case DNS_T_UNSPEC: return dns_typetab[56].name;
case DNS_T_TSIG: return dns_typetab[57].name;
case DNS_T_IXFR: return dns_typetab[58].name;
case DNS_T_AXFR: return dns_typetab[59].name;
case DNS_T_MAILB: return dns_typetab[60].name;
case DNS_T_MAILA: return dns_typetab[61].name;
case DNS_T_ANY: return dns_typetab[62].name;
case DNS_T_ZXFR: return dns_typetab[63].name;
case DNS_T_DLV: return dns_typetab[64].name;
case DNS_T_MAX: return dns_typetab[65].name;
}
return _dns_format_code(nm,"type",code);
}
const struct dns_nameval dns_classtab[] = {
{DNS_C_INVALID,"INVALID"},
{DNS_C_IN,"IN"},
{DNS_C_CH,"CH"},
{DNS_C_HS,"HS"},
{DNS_C_ANY,"ANY"},
{0,0}};
const char *dns_classname(enum dns_class code) {
static char nm[20];
switch(code) {
case DNS_C_INVALID: return dns_classtab[0].name;
case DNS_C_IN: return dns_classtab[1].name;
case DNS_C_CH: return dns_classtab[2].name;
case DNS_C_HS: return dns_classtab[3].name;
case DNS_C_ANY: return dns_classtab[4].name;
}
return _dns_format_code(nm,"class",code);
}
const struct dns_nameval dns_rcodetab[] = {
{DNS_R_NOERROR,"NOERROR"},
{DNS_R_FORMERR,"FORMERR"},
{DNS_R_SERVFAIL,"SERVFAIL"},
{DNS_R_NXDOMAIN,"NXDOMAIN"},
{DNS_R_NOTIMPL,"NOTIMPL"},
{DNS_R_REFUSED,"REFUSED"},
{DNS_R_YXDOMAIN,"YXDOMAIN"},
{DNS_R_YXRRSET,"YXRRSET"},
{DNS_R_NXRRSET,"NXRRSET"},
{DNS_R_NOTAUTH,"NOTAUTH"},
{DNS_R_NOTZONE,"NOTZONE"},
{DNS_R_BADSIG,"BADSIG"},
{DNS_R_BADKEY,"BADKEY"},
{DNS_R_BADTIME,"BADTIME"},
{0,0}};
const char *dns_rcodename(enum dns_rcode code) {
static char nm[20];
switch(code) {
case DNS_R_NOERROR: return dns_rcodetab[0].name;
case DNS_R_FORMERR: return dns_rcodetab[1].name;
case DNS_R_SERVFAIL: return dns_rcodetab[2].name;
case DNS_R_NXDOMAIN: return dns_rcodetab[3].name;
case DNS_R_NOTIMPL: return dns_rcodetab[4].name;
case DNS_R_REFUSED: return dns_rcodetab[5].name;
case DNS_R_YXDOMAIN: return dns_rcodetab[6].name;
case DNS_R_YXRRSET: return dns_rcodetab[7].name;
case DNS_R_NXRRSET: return dns_rcodetab[8].name;
case DNS_R_NOTAUTH: return dns_rcodetab[9].name;
case DNS_R_NOTZONE: return dns_rcodetab[10].name;
case DNS_R_BADSIG: return dns_rcodetab[11].name;
case DNS_R_BADKEY: return dns_rcodetab[12].name;
case DNS_R_BADTIME: return dns_rcodetab[13].name;
}
return _dns_format_code(nm,"rcode",code);
}

379
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/* udns_dn.c
domain names manipulation routines
Copyright (C) 2005 Michael Tokarev <mjt@corpit.ru>
This file is part of UDNS library, an async DNS stub resolver.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library, in file named COPYING.LGPL; if not,
write to the Free Software Foundation, Inc., 59 Temple Place,
Suite 330, Boston, MA 02111-1307 USA
*/
#include <string.h>
#include "udns.h"
unsigned dns_dnlen(dnscc_t *dn) {
register dnscc_t *d = dn;
while(*d)
d += 1 + *d;
return (unsigned)(d - dn) + 1;
}
unsigned dns_dnlabels(register dnscc_t *dn) {
register unsigned l = 0;
while(*dn)
++l, dn += 1 + *dn;
return l;
}
unsigned dns_dnequal(register dnscc_t *dn1, register dnscc_t *dn2) {
register unsigned c;
dnscc_t *dn = dn1;
for(;;) {
if ((c = *dn1++) != *dn2++)
return 0;
if (!c)
return (unsigned)(dn1 - dn);
while(c--) {
if (DNS_DNLC(*dn1) != DNS_DNLC(*dn2))
return 0;
++dn1; ++dn2;
}
}
}
unsigned
dns_dntodn(dnscc_t *sdn, dnsc_t *ddn, unsigned ddnsiz) {
unsigned sdnlen = dns_dnlen(sdn);
if (ddnsiz < sdnlen)
return 0;
memcpy(ddn, sdn, sdnlen);
return sdnlen;
}
int
dns_ptodn(const char *name, unsigned namelen,
dnsc_t *dn, unsigned dnsiz, int *isabs)
{
dnsc_t *dp; /* current position in dn (len byte first) */
dnsc_t *const de /* end of dn: last byte that can be filled up */
= dn + (dnsiz >= DNS_MAXDN ? DNS_MAXDN : dnsiz) - 1;
dnscc_t *np = (dnscc_t *)name;
dnscc_t *ne = np + (namelen ? namelen : strlen((char*)np));
dnsc_t *llab; /* start of last label (llab[-1] will be length) */
unsigned c; /* next input character, or length of last label */
if (!dnsiz)
return 0;
dp = llab = dn + 1;
while(np < ne) {
if (*np == '.') { /* label delimiter */
c = dp - llab; /* length of the label */
if (!c) { /* empty label */
if (np == (dnscc_t *)name && np + 1 == ne) {
/* special case for root dn, aka `.' */
++np;
break;
}
return -1; /* zero label */
}
if (c > DNS_MAXLABEL)
return -1; /* label too long */
llab[-1] = (dnsc_t)c; /* update len of last label */
llab = ++dp; /* start new label, llab[-1] will be len of it */
++np;
continue;
}
/* check whenever we may put out one more byte */
if (dp >= de) /* too long? */
return dnsiz >= DNS_MAXDN ? -1 : 0;
if (*np != '\\') { /* non-escape, simple case */
*dp++ = *np++;
continue;
}
/* handle \-style escape */
/* note that traditionally, domain names (gethostbyname etc)
* used decimal \dd notation, not octal \ooo (RFC1035), so
* we're following this tradition here.
*/
if (++np == ne)
return -1; /* bad escape */
else if (*np >= '0' && *np <= '9') { /* decimal number */
/* we allow not only exactly 3 digits as per RFC1035,
* but also 2 or 1, for better usability. */
c = *np++ - '0';
if (np < ne && *np >= '0' && *np <= '9') { /* 2digits */
c = c * 10 + *np++ - '0';
if (np < ne && *np >= '0' && *np <= '9') {
c = c * 10 + *np++ - '0';
if (c > 255)
return -1; /* bad escape */
}
}
}
else
c = *np++;
*dp++ = (dnsc_t)c; /* place next out byte */
}
if ((c = dp - llab) > DNS_MAXLABEL)
return -1; /* label too long */
if ((llab[-1] = (dnsc_t)c) != 0) {
*dp++ = 0;
if (isabs)
*isabs = 0;
}
else if (isabs)
*isabs = 1;
return dp - dn;
}
dnscc_t dns_inaddr_arpa_dn[14] = "\07in-addr\04arpa";
dnsc_t *
dns_a4todn_(const struct in_addr *addr, dnsc_t *dn, dnsc_t *dne) {
const unsigned char *s = ((const unsigned char *)addr) + 4;
while(s > (const unsigned char *)addr) {
unsigned n = *--s;
dnsc_t *p = dn + 1;
if (n > 99) {
if (p + 2 > dne) return 0;
*p++ = n / 100 + '0';
*p++ = (n % 100 / 10) + '0';
*p = n % 10 + '0';
}
else if (n > 9) {
if (p + 1 > dne) return 0;
*p++ = n / 10 + '0';
*p = n % 10 + '0';
}
else {
if (p > dne) return 0;
*p = n + '0';
}
*dn = p - dn;
dn = p + 1;
}
return dn;
}
int dns_a4todn(const struct in_addr *addr, dnscc_t *tdn,
dnsc_t *dn, unsigned dnsiz) {
dnsc_t *dne = dn + (dnsiz > DNS_MAXDN ? DNS_MAXDN : dnsiz);
dnsc_t *p;
unsigned l;
p = dns_a4todn_(addr, dn, dne);
if (!p) return 0;
if (!tdn)
tdn = dns_inaddr_arpa_dn;
l = dns_dnlen(tdn);
if (p + l > dne) return dnsiz >= DNS_MAXDN ? -1 : 0;
memcpy(p, tdn, l);
return (p + l) - dn;
}
int dns_a4ptodn(const struct in_addr *addr, const char *tname,
dnsc_t *dn, unsigned dnsiz) {
dnsc_t *p;
int r;
if (!tname)
return dns_a4todn(addr, NULL, dn, dnsiz);
p = dns_a4todn_(addr, dn, dn + dnsiz);
if (!p) return 0;
r = dns_sptodn(tname, p, dnsiz - (p - dn));
return r != 0 ? r : dnsiz >= DNS_MAXDN ? -1 : 0;
}
dnscc_t dns_ip6_arpa_dn[10] = "\03ip6\04arpa";
dnsc_t *
dns_a6todn_(const struct in6_addr *addr, dnsc_t *dn, dnsc_t *dne) {
const unsigned char *s = ((const unsigned char *)addr) + 16;
if (dn + 64 > dne) return 0;
while(s > (const unsigned char *)addr) {
unsigned n = *--s & 0x0f;
*dn++ = 1;
*dn++ = n > 9 ? n + 'a' - 10 : n + '0';
*dn++ = 1;
n = *s >> 4;
*dn++ = n > 9 ? n + 'a' - 10 : n + '0';
}
return dn;
}
int dns_a6todn(const struct in6_addr *addr, dnscc_t *tdn,
dnsc_t *dn, unsigned dnsiz) {
dnsc_t *dne = dn + (dnsiz > DNS_MAXDN ? DNS_MAXDN : dnsiz);
dnsc_t *p;
unsigned l;
p = dns_a6todn_(addr, dn, dne);
if (!p) return 0;
if (!tdn)
tdn = dns_ip6_arpa_dn;
l = dns_dnlen(tdn);
if (p + l > dne) return dnsiz >= DNS_MAXDN ? -1 : 0;
memcpy(p, tdn, l);
return (p + l) - dn;
}
int dns_a6ptodn(const struct in6_addr *addr, const char *tname,
dnsc_t *dn, unsigned dnsiz) {
dnsc_t *p;
int r;
if (!tname)
return dns_a6todn(addr, NULL, dn, dnsiz);
p = dns_a6todn_(addr, dn, dn + dnsiz);
if (!p) return 0;
r = dns_sptodn(tname, p, dnsiz - (p - dn));
return r != 0 ? r : dnsiz >= DNS_MAXDN ? -1 : 0;
}
/* return size of buffer required to convert the dn into asciiz string.
* Keep in sync with dns_dntop() below.
*/
unsigned dns_dntop_size(dnscc_t *dn) {
unsigned size = 0; /* the size reqd */
dnscc_t *le; /* label end */
while(*dn) {
/* *dn is the length of the next label, non-zero */
if (size)
++size; /* for the dot */
le = dn + *dn + 1;
++dn;
do {
switch(*dn) {
case '.':
case '\\':
/* Special modifiers in zone files. */
case '"':
case ';':
case '@':
case '$':
size += 2;
break;
default:
if (*dn <= 0x20 || *dn >= 0x7f)
/* \ddd decimal notation */
size += 4;
else
size += 1;
}
} while(++dn < le);
}
size += 1; /* zero byte at the end - string terminator */
return size > DNS_MAXNAME ? 0 : size;
}
/* Convert the dn into asciiz string.
* Keep in sync with dns_dntop_size() above.
*/
int dns_dntop(dnscc_t *dn, char *name, unsigned namesiz) {
char *np = name; /* current name ptr */
char *const ne = name + namesiz; /* end of name */
dnscc_t *le; /* label end */
while(*dn) {
/* *dn is the length of the next label, non-zero */
if (np != name) {
if (np >= ne) goto toolong;
*np++ = '.';
}
le = dn + *dn + 1;
++dn;
do {
switch(*dn) {
case '.':
case '\\':
/* Special modifiers in zone files. */
case '"':
case ';':
case '@':
case '$':
if (np + 2 > ne) goto toolong;
*np++ = '\\';
*np++ = *dn;
break;
default:
if (*dn <= 0x20 || *dn >= 0x7f) {
/* \ddd decimal notation */
if (np + 4 >= ne) goto toolong;
*np++ = '\\';
*np++ = '0' + (*dn / 100);
*np++ = '0' + ((*dn % 100) / 10);
*np++ = '0' + (*dn % 10);
}
else {
if (np >= ne) goto toolong;
*np++ = *dn;
}
}
} while(++dn < le);
}
if (np >= ne) goto toolong;
*np++ = '\0';
return np - name;
toolong:
return namesiz >= DNS_MAXNAME ? -1 : 0;
}
#ifdef TEST
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char **argv) {
int i;
int sz;
dnsc_t dn[DNS_MAXDN+10];
dnsc_t *dl, *dp;
int isabs;
sz = (argc > 1) ? atoi(argv[1]) : 0;
for(i = 2; i < argc; ++i) {
int r = dns_ptodn(argv[i], 0, dn, sz, &isabs);
printf("%s: ", argv[i]);
if (r < 0) printf("error\n");
else if (!r) printf("buffer too small\n");
else {
printf("len=%d dnlen=%d size=%d name:",
r, dns_dnlen(dn), dns_dntop_size(dn));
dl = dn;
while(*dl) {
printf(" %d=", *dl);
dp = dl + 1;
dl = dp + *dl;
while(dp < dl) {
if (*dp <= ' ' || *dp >= 0x7f)
printf("\\%03d", *dp);
else if (*dp == '.' || *dp == '\\')
printf("\\%c", *dp);
else
putchar(*dp);
++dp;
}
}
if (isabs) putchar('.');
putchar('\n');
}
}
return 0;
}
#endif /* TEST */

30
contrib/udns/udns_dntosp.c Normal file
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/* udns_dntosp.c
dns_dntosp() = convert DN to asciiz string using static buffer
Copyright (C) 2005 Michael Tokarev <mjt@corpit.ru>
This file is part of UDNS library, an async DNS stub resolver.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library, in file named COPYING.LGPL; if not,
write to the Free Software Foundation, Inc., 59 Temple Place,
Suite 330, Boston, MA 02111-1307 USA
*/
#include "udns.h"
static char name[DNS_MAXNAME];
const char *dns_dntosp(dnscc_t *dn) {
return dns_dntop(dn, name, sizeof(name)) > 0 ? name : 0;
}

231
contrib/udns/udns_init.c Normal file
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/* udns_init.c
resolver initialisation stuff
Copyright (C) 2006 Michael Tokarev <mjt@corpit.ru>
This file is part of UDNS library, an async DNS stub resolver.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library, in file named COPYING.LGPL; if not,
write to the Free Software Foundation, Inc., 59 Temple Place,
Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef WINDOWS
# include <winsock2.h> /* includes <windows.h> */
# include <iphlpapi.h> /* for dns server addresses etc */
#else
# include <sys/types.h>
# include <unistd.h>
# include <fcntl.h>
#endif /* !WINDOWS */
#include <stdlib.h>
#include <string.h>
#include "udns.h"
#define ISSPACE(x) (x == ' ' || x == '\t' || x == '\r' || x == '\n')
static const char space[] = " \t\r\n";
static void dns_set_serv_internal(struct dns_ctx *ctx, char *serv) {
dns_add_serv(ctx, NULL);
for(serv = strtok(serv, space); serv; serv = strtok(NULL, space))
dns_add_serv(ctx, serv);
}
static void dns_set_srch_internal(struct dns_ctx *ctx, char *srch) {
dns_add_srch(ctx, NULL);
for(srch = strtok(srch, space); srch; srch = strtok(NULL, space))
dns_add_srch(ctx, srch);
}
#ifdef WINDOWS
#ifndef NO_IPHLPAPI
/* Apparently, some systems does not have proper headers for IPHLPAIP to work.
* The best is to upgrade headers, but here's another, ugly workaround for
* this: compile with -DNO_IPHLPAPI.
*/
typedef DWORD (WINAPI *GetAdaptersAddressesFunc)(
ULONG Family, DWORD Flags, PVOID Reserved,
PIP_ADAPTER_ADDRESSES pAdapterAddresses,
PULONG pOutBufLen);
static int dns_initns_iphlpapi(struct dns_ctx *ctx) {
HANDLE h_iphlpapi;
GetAdaptersAddressesFunc pfnGetAdAddrs;
PIP_ADAPTER_ADDRESSES pAddr, pAddrBuf;
PIP_ADAPTER_DNS_SERVER_ADDRESS pDnsAddr;
ULONG ulOutBufLen;
DWORD dwRetVal;
int ret = -1;
h_iphlpapi = LoadLibrary("iphlpapi.dll");
if (!h_iphlpapi)
return -1;
pfnGetAdAddrs = (GetAdaptersAddressesFunc)
GetProcAddress(h_iphlpapi, "GetAdaptersAddresses");
if (!pfnGetAdAddrs) goto freelib;
ulOutBufLen = 0;
dwRetVal = pfnGetAdAddrs(AF_UNSPEC, 0, NULL, NULL, &ulOutBufLen);
if (dwRetVal != ERROR_BUFFER_OVERFLOW) goto freelib;
pAddrBuf = malloc(ulOutBufLen);
if (!pAddrBuf) goto freelib;
dwRetVal = pfnGetAdAddrs(AF_UNSPEC, 0, NULL, pAddrBuf, &ulOutBufLen);
if (dwRetVal != ERROR_SUCCESS) goto freemem;
for (pAddr = pAddrBuf; pAddr; pAddr = pAddr->Next)
for (pDnsAddr = pAddr->FirstDnsServerAddress;
pDnsAddr;
pDnsAddr = pDnsAddr->Next)
dns_add_serv_s(ctx, pDnsAddr->Address.lpSockaddr);
ret = 0;
freemem:
free(pAddrBuf);
freelib:
FreeLibrary(h_iphlpapi);
return ret;
}
#else /* NO_IPHLPAPI */
#define dns_initns_iphlpapi(ctx) (-1)
#endif /* NO_IPHLPAPI */
static int dns_initns_registry(struct dns_ctx *ctx) {
LONG res;
HKEY hk;
DWORD type = REG_EXPAND_SZ | REG_SZ;
DWORD len;
char valBuf[1024];
#define REGKEY_WINNT "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters"
#define REGKEY_WIN9x "SYSTEM\\CurrentControlSet\\Services\\VxD\\MSTCP"
res = RegOpenKeyEx(HKEY_LOCAL_MACHINE, REGKEY_WINNT, 0, KEY_QUERY_VALUE, &hk);
if (res != ERROR_SUCCESS)
res = RegOpenKeyEx(HKEY_LOCAL_MACHINE, REGKEY_WIN9x,
0, KEY_QUERY_VALUE, &hk);
if (res != ERROR_SUCCESS)
return -1;
len = sizeof(valBuf) - 1;
res = RegQueryValueEx(hk, "NameServer", NULL, &type, (BYTE*)valBuf, &len);
if (res != ERROR_SUCCESS || !len || !valBuf[0]) {
len = sizeof(valBuf) - 1;
res = RegQueryValueEx(hk, "DhcpNameServer", NULL, &type,
(BYTE*)valBuf, &len);
}
RegCloseKey(hk);
if (res != ERROR_SUCCESS || !len || !valBuf[0])
return -1;
valBuf[len] = '\0';
/* nameservers are stored as a whitespace-seperate list:
* "192.168.1.1 123.21.32.12" */
dns_set_serv_internal(ctx, valBuf);
return 0;
}
#else /* !WINDOWS */
static int dns_init_resolvconf(struct dns_ctx *ctx) {
char *v;
char buf[2049]; /* this buffer is used to hold /etc/resolv.conf */
int has_srch = 0;
/* read resolv.conf... */
{ int fd = open("/etc/resolv.conf", O_RDONLY);
if (fd >= 0) {
int l = read(fd, buf, sizeof(buf) - 1);
close(fd);
buf[l < 0 ? 0 : l] = '\0';
}
else
buf[0] = '\0';
}
if (buf[0]) { /* ...and parse it */
char *line, *nextline;
line = buf;
do {
nextline = strchr(line, '\n');
if (nextline) *nextline++ = '\0';
v = line;
while(*v && !ISSPACE(*v)) ++v;
if (!*v) continue;
*v++ = '\0';
while(ISSPACE(*v)) ++v;
if (!*v) continue;
if (strcmp(line, "domain") == 0) {
dns_set_srch_internal(ctx, strtok(v, space));
has_srch = 1;
}
else if (strcmp(line, "search") == 0) {
dns_set_srch_internal(ctx, v);
has_srch = 1;
}
else if (strcmp(line, "nameserver") == 0)
dns_add_serv(ctx, strtok(v, space));
else if (strcmp(line, "options") == 0)
dns_set_opts(ctx, v);
} while((line = nextline) != NULL);
}
buf[sizeof(buf)-1] = '\0';
/* get list of nameservers from env. vars. */
if ((v = getenv("NSCACHEIP")) != NULL ||
(v = getenv("NAMESERVERS")) != NULL) {
strncpy(buf, v, sizeof(buf) - 1);
dns_set_serv_internal(ctx, buf);
}
/* if $LOCALDOMAIN is set, use it for search list */
if ((v = getenv("LOCALDOMAIN")) != NULL) {
strncpy(buf, v, sizeof(buf) - 1);
dns_set_srch_internal(ctx, buf);
has_srch = 1;
}
if ((v = getenv("RES_OPTIONS")) != NULL)
dns_set_opts(ctx, v);
/* if still no search list, use local domain name */
if (has_srch &&
gethostname(buf, sizeof(buf) - 1) == 0 &&
(v = strchr(buf, '.')) != NULL &&
*++v != '\0')
dns_add_srch(ctx, v);
return 0;
}
#endif /* !WINDOWS */
int dns_init(struct dns_ctx *ctx, int do_open) {
if (!ctx)
ctx = &dns_defctx;
dns_reset(ctx);
#ifdef WINDOWS
if (dns_initns_iphlpapi(ctx) != 0)
dns_initns_registry(ctx);
/*XXX WINDOWS: probably good to get default domain and search list too...
* And options. Something is in registry. */
/*XXX WINDOWS: maybe environment variables are also useful? */
#else
dns_init_resolvconf(ctx);
#endif
return do_open ? dns_open(ctx) : 0;
}

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/* udns_jran.c: small non-cryptographic random number generator
* taken from http://burtleburtle.net/bob/rand/smallprng.html
* by Bob Jenkins, Public domain.
*/
#include "udns.h"
#define rot32(x,k) (((x) << (k)) | ((x) >> (32-(k))))
#define rot64(x,k) (((x) << (k)) | ((x) >> (64-(k))))
#define tr32(x) ((x)&0xffffffffu)
unsigned udns_jranval(struct udns_jranctx *x) {
/* This routine can be made to work with either 32 or 64bit words -
* if JRAN_32_64 is defined when compiling the file.
* We use if() instead of #if since there's no good
* portable way to check sizeof() in preprocessor without
* introducing some ugly configure-time checks.
* Most compilers will optimize the wrong branches away anyway.
* By default it assumes 32bit integers
*/
#ifdef JRAN_32_64
if (sizeof(unsigned) == 4) {
#endif
unsigned e = tr32(x->a - rot32(x->b, 27));
x->a = tr32(x->b ^ rot32(x->c, 17));
x->b = tr32(x->c + x->d);
x->c = tr32(x->d + e);
x->d = tr32(e + x->a);
#ifdef JRAN_32_64
}
else if (sizeof(unsigned) == 8) { /* assuming it's 64bits */
unsigned e = x->a - rot64(x->b, 7);
x->a = x->b ^ rot64(x->c, 13);
x->b = x->c + rot64(x->d, 37);
x->c = x->d + e;
x->d = e + x->a;
}
else {
unsigned e = 0;
x->d = 1/e; /* bail */
}
#endif
return x->d;
}
void udns_jraninit(struct udns_jranctx *x, unsigned seed) {
unsigned i;
x->a = 0xf1ea5eed;
x->b = x->c = x->d = seed;
for (i = 0; i < 20; ++i)
(void)udns_jranval(x);
}

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/* udns_misc.c
miscellaneous routines
Copyright (C) 2005 Michael Tokarev <mjt@corpit.ru>
This file is part of UDNS library, an async DNS stub resolver.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library, in file named COPYING.LGPL; if not,
write to the Free Software Foundation, Inc., 59 Temple Place,
Suite 330, Boston, MA 02111-1307 USA
*/
#include "udns.h"
int dns_findname(const struct dns_nameval *nv, const char *name) {
register const char *a, *b;
for(; nv->name; ++nv)
for(a = name, b = nv->name; ; ++a, ++b)
if (DNS_DNUC(*a) != *b) break;
else if (!*a) return nv->val;
return -1;
}
const char *_dns_format_code(char *buf, const char *prefix, int code) {
char *bp = buf;
unsigned c, n;
do *bp++ = DNS_DNUC(*prefix);
while(*++prefix);
*bp++ = '#';
if (code < 0) code = -code, *bp++ = '-';
n = 0; c = code;
do ++n;
while((c /= 10));
c = code;
bp[n--] = '\0';
do bp[n--] = c % 10 + '0';
while((c /= 10));
return buf;
}
const char *dns_strerror(int err) {
if (err >= 0) return "successeful completion";
switch(err) {
case DNS_E_TEMPFAIL: return "temporary failure in name resolution";
case DNS_E_PROTOCOL: return "protocol error";
case DNS_E_NXDOMAIN: return "domain name does not exist";
case DNS_E_NODATA: return "valid domain but no data of requested type";
case DNS_E_NOMEM: return "out of memory";
case DNS_E_BADQUERY: return "malformed query";
default: return "unknown error";
}
}
const char *dns_version(void) {
return UDNS_VERSION;
}

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/* udns_parse.c
raw DNS packet parsing routines
Copyright (C) 2005 Michael Tokarev <mjt@corpit.ru>
This file is part of UDNS library, an async DNS stub resolver.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library, in file named COPYING.LGPL; if not,
write to the Free Software Foundation, Inc., 59 Temple Place,
Suite 330, Boston, MA 02111-1307 USA
*/
#include <string.h>
#include <assert.h>
#include "udns.h"
dnscc_t *dns_skipdn(dnscc_t *cur, dnscc_t *end) {
unsigned c;
for(;;) {
if (cur >= end)
return NULL;
c = *cur++;
if (!c)
return cur;
if (c & 192) /* jump */
return cur + 1 >= end ? NULL : cur + 1;
cur += c;
}
}
int
dns_getdn(dnscc_t *pkt, dnscc_t **cur, dnscc_t *end,
register dnsc_t *dn, unsigned dnsiz) {
unsigned c;
dnscc_t *pp = *cur; /* current packet pointer */
dnsc_t *dp = dn; /* current dn pointer */
dnsc_t *const de /* end of the DN dest */
= dn + (dnsiz < DNS_MAXDN ? dnsiz : DNS_MAXDN);
dnscc_t *jump = NULL; /* ptr after first jump if any */
unsigned loop = 100; /* jump loop counter */
for(;;) { /* loop by labels */
if (pp >= end) /* reached end of packet? */
return -1;
c = *pp++; /* length of the label */
if (!c) { /* empty label: terminate */
if (dn >= de) /* can't fit terminator */
goto noroom;
*dp++ = 0;
/* return next pos: either after the first jump or current */
*cur = jump ? jump : pp;
return dp - dn;
}
if (c & 192) { /* jump */
if (pp >= end) /* eop instead of jump pos */
return -1;
if (!jump) jump = pp + 1; /* remember first jump */
else if (!--loop) return -1; /* too many jumps */
c = ((c & ~192) << 8) | *pp; /* new pos */
if (c < DNS_HSIZE) /* don't allow jump into the header */
return -1;
pp = pkt + c;
continue;
}
if (c > DNS_MAXLABEL) /* too long label? */
return -1;
if (pp + c > end) /* label does not fit in packet? */
return -1;
if (dp + c + 1 > de) /* if enouth room for the label */
goto noroom;
*dp++ = c; /* label length */
memcpy(dp, pp, c); /* and the label itself */
dp += c;
pp += c; /* advance to the next label */
}
noroom:
return dnsiz < DNS_MAXDN ? 0 : -1;
}
void dns_rewind(struct dns_parse *p, dnscc_t *qdn) {
p->dnsp_qdn = qdn;
p->dnsp_cur = p->dnsp_ans;
p->dnsp_rrl = dns_numan(p->dnsp_pkt);
p->dnsp_ttl = 0xffffffffu;
p->dnsp_nrr = 0;
}
void
dns_initparse(struct dns_parse *p, dnscc_t *qdn,
dnscc_t *pkt, dnscc_t *cur, dnscc_t *end) {
p->dnsp_pkt = pkt;
p->dnsp_end = end;
p->dnsp_rrl = dns_numan(pkt);
p->dnsp_qdn = qdn;
assert(cur + 4 <= end);
if ((p->dnsp_qtyp = dns_get16(cur+0)) == DNS_T_ANY) p->dnsp_qtyp = 0;
if ((p->dnsp_qcls = dns_get16(cur+2)) == DNS_C_ANY) p->dnsp_qcls = 0;
p->dnsp_cur = p->dnsp_ans = cur + 4;
p->dnsp_ttl = 0xffffffffu;
p->dnsp_nrr = 0;
}
int dns_nextrr(struct dns_parse *p, struct dns_rr *rr) {
dnscc_t *cur = p->dnsp_cur;
while(p->dnsp_rrl > 0) {
--p->dnsp_rrl;
if (dns_getdn(p->dnsp_pkt, &cur, p->dnsp_end,
rr->dnsrr_dn, sizeof(rr->dnsrr_dn)) <= 0)
return -1;
if (cur + 10 > p->dnsp_end)
return -1;
rr->dnsrr_typ = dns_get16(cur);
rr->dnsrr_cls = dns_get16(cur+2);
rr->dnsrr_ttl = dns_get32(cur+4);
rr->dnsrr_dsz = dns_get16(cur+8);
rr->dnsrr_dptr = cur = cur + 10;
rr->dnsrr_dend = cur = cur + rr->dnsrr_dsz;
if (cur > p->dnsp_end)
return -1;
if (p->dnsp_qdn && !dns_dnequal(p->dnsp_qdn, rr->dnsrr_dn))
continue;
if ((!p->dnsp_qcls || p->dnsp_qcls == rr->dnsrr_cls) &&
(!p->dnsp_qtyp || p->dnsp_qtyp == rr->dnsrr_typ)) {
p->dnsp_cur = cur;
++p->dnsp_nrr;
if (p->dnsp_ttl > rr->dnsrr_ttl) p->dnsp_ttl = rr->dnsrr_ttl;
return 1;
}
if (p->dnsp_qdn && rr->dnsrr_typ == DNS_T_CNAME && !p->dnsp_nrr) {
if (dns_getdn(p->dnsp_pkt, &rr->dnsrr_dptr, p->dnsp_end,
p->dnsp_dnbuf, sizeof(p->dnsp_dnbuf)) <= 0 ||
rr->dnsrr_dptr != rr->dnsrr_dend)
return -1;
p->dnsp_qdn = p->dnsp_dnbuf;
if (p->dnsp_ttl > rr->dnsrr_ttl) p->dnsp_ttl = rr->dnsrr_ttl;
}
}
p->dnsp_cur = cur;
return 0;
}
int dns_stdrr_size(const struct dns_parse *p) {
return
dns_dntop_size(p->dnsp_qdn) +
(p->dnsp_qdn == dns_payload(p->dnsp_pkt) ? 0 :
dns_dntop_size(dns_payload(p->dnsp_pkt)));
}
void *dns_stdrr_finish(struct dns_rr_null *ret, char *cp,
const struct dns_parse *p) {
cp += dns_dntop(p->dnsp_qdn, (ret->dnsn_cname = cp), DNS_MAXNAME);
if (p->dnsp_qdn == dns_payload(p->dnsp_pkt))
ret->dnsn_qname = ret->dnsn_cname;
else
dns_dntop(dns_payload(p->dnsp_pkt), (ret->dnsn_qname = cp), DNS_MAXNAME);
ret->dnsn_ttl = p->dnsp_ttl;
return ret;
}

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/* udns_rr_a.c
parse/query A/AAAA IN records
Copyright (C) 2005 Michael Tokarev <mjt@corpit.ru>
This file is part of UDNS library, an async DNS stub resolver.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library, in file named COPYING.LGPL; if not,
write to the Free Software Foundation, Inc., 59 Temple Place,
Suite 330, Boston, MA 02111-1307 USA
*/
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#ifndef WINDOWS
# include <sys/types.h>
# include <netinet/in.h>
#endif
#include "udns.h"
/* here, we use common routine to parse both IPv4 and IPv6 addresses.
*/
/* this structure should match dns_rr_a[46] */
struct dns_rr_a {
dns_rr_common(dnsa);
unsigned char *dnsa_addr;
};
static int
dns_parse_a(dnscc_t *qdn, dnscc_t *pkt, dnscc_t *cur, dnscc_t *end,
void **result, unsigned dsize) {
struct dns_rr_a *ret;
struct dns_parse p;
struct dns_rr rr;
int r;
/* first, validate and count number of addresses */
dns_initparse(&p, qdn, pkt, cur, end);
while((r = dns_nextrr(&p, &rr)) > 0)
if (rr.dnsrr_dsz != dsize)
return DNS_E_PROTOCOL;
if (r < 0)
return DNS_E_PROTOCOL;
else if (!p.dnsp_nrr)
return DNS_E_NODATA;
ret = malloc(sizeof(*ret) + dsize * p.dnsp_nrr + dns_stdrr_size(&p));
if (!ret)
return DNS_E_NOMEM;
ret->dnsa_nrr = p.dnsp_nrr;
ret->dnsa_addr = (unsigned char*)(ret+1);
/* copy the RRs */
for (dns_rewind(&p, qdn), r = 0; dns_nextrr(&p, &rr); ++r)
memcpy(ret->dnsa_addr + dsize * r, rr.dnsrr_dptr, dsize);
dns_stdrr_finish((struct dns_rr_null *)ret,
(char *)(ret->dnsa_addr + dsize * p.dnsp_nrr), &p);
*result = ret;
return 0;
}
int
dns_parse_a4(dnscc_t *qdn, dnscc_t *pkt, dnscc_t *cur, dnscc_t *end,
void **result) {
#ifdef AF_INET
assert(sizeof(struct in_addr) == 4);
#endif
assert(dns_get16(cur+2) == DNS_C_IN && dns_get16(cur+0) == DNS_T_A);
return dns_parse_a(qdn, pkt, cur, end, result, 4);
}
struct dns_query *
dns_submit_a4(struct dns_ctx *ctx, const char *name, int flags,
dns_query_a4_fn *cbck, void *data) {
return
dns_submit_p(ctx, name, DNS_C_IN, DNS_T_A, flags,
dns_parse_a4, (dns_query_fn*)cbck, data);
}
struct dns_rr_a4 *
dns_resolve_a4(struct dns_ctx *ctx, const char *name, int flags) {
return (struct dns_rr_a4 *)
dns_resolve_p(ctx, name, DNS_C_IN, DNS_T_A, flags, dns_parse_a4);
}
int
dns_parse_a6(dnscc_t *qdn, dnscc_t *pkt, dnscc_t *cur, dnscc_t *end,
void **result) {
#ifdef AF_INET6
assert(sizeof(struct in6_addr) == 16);
#endif
assert(dns_get16(cur+2) == DNS_C_IN && dns_get16(cur+0) == DNS_T_AAAA);
return dns_parse_a(qdn, pkt, cur, end, result, 16);
}
struct dns_query *
dns_submit_a6(struct dns_ctx *ctx, const char *name, int flags,
dns_query_a6_fn *cbck, void *data) {
return
dns_submit_p(ctx, name, DNS_C_IN, DNS_T_AAAA, flags,
dns_parse_a6, (dns_query_fn*)cbck, data);
}
struct dns_rr_a6 *
dns_resolve_a6(struct dns_ctx *ctx, const char *name, int flags) {
return (struct dns_rr_a6 *)
dns_resolve_p(ctx, name, DNS_C_IN, DNS_T_AAAA, flags, dns_parse_a6);
}

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/* udns_rr_mx.c
parse/query MX IN records
Copyright (C) 2005 Michael Tokarev <mjt@corpit.ru>
This file is part of UDNS library, an async DNS stub resolver.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library, in file named COPYING.LGPL; if not,
write to the Free Software Foundation, Inc., 59 Temple Place,
Suite 330, Boston, MA 02111-1307 USA
*/
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include "udns.h"
int
dns_parse_mx(dnscc_t *qdn, dnscc_t *pkt, dnscc_t *cur, dnscc_t *end,
void **result) {
struct dns_rr_mx *ret;
struct dns_parse p;
struct dns_rr rr;
int r, l;
char *sp;
dnsc_t mx[DNS_MAXDN];
assert(dns_get16(cur+2) == DNS_C_IN && dns_get16(cur+0) == DNS_T_MX);
/* first, validate the answer and count size of the result */
l = 0;
dns_initparse(&p, qdn, pkt, cur, end);
while((r = dns_nextrr(&p, &rr)) > 0) {
cur = rr.dnsrr_dptr + 2;
r = dns_getdn(pkt, &cur, end, mx, sizeof(mx));
if (r <= 0 || cur != rr.dnsrr_dend)
return DNS_E_PROTOCOL;
l += dns_dntop_size(mx);
}
if (r < 0)
return DNS_E_PROTOCOL;
if (!p.dnsp_nrr)
return DNS_E_NODATA;
/* next, allocate and set up result */
l += dns_stdrr_size(&p);
ret = malloc(sizeof(*ret) + sizeof(struct dns_mx) * p.dnsp_nrr + l);
if (!ret)
return DNS_E_NOMEM;
ret->dnsmx_nrr = p.dnsp_nrr;
ret->dnsmx_mx = (struct dns_mx *)(ret+1);
/* and 3rd, fill in result, finally */
sp = (char*)(ret->dnsmx_mx + p.dnsp_nrr);
for (dns_rewind(&p, qdn), r = 0; dns_nextrr(&p, &rr); ++r) {
ret->dnsmx_mx[r].name = sp;
cur = rr.dnsrr_dptr;
ret->dnsmx_mx[r].priority = dns_get16(cur);
cur += 2;
dns_getdn(pkt, &cur, end, mx, sizeof(mx));
sp += dns_dntop(mx, sp, DNS_MAXNAME);
}
dns_stdrr_finish((struct dns_rr_null *)ret, sp, &p);
*result = ret;
return 0;
}
struct dns_query *
dns_submit_mx(struct dns_ctx *ctx, const char *name, int flags,
dns_query_mx_fn *cbck, void *data) {
return
dns_submit_p(ctx, name, DNS_C_IN, DNS_T_MX, flags,
dns_parse_mx, (dns_query_fn *)cbck, data);
}
struct dns_rr_mx *
dns_resolve_mx(struct dns_ctx *ctx, const char *name, int flags) {
return (struct dns_rr_mx *)
dns_resolve_p(ctx, name, DNS_C_IN, DNS_T_MX, flags, dns_parse_mx);
}

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/* udns_rr_naptr.c
parse/query NAPTR IN records
Copyright (C) 2005 Michael Tokarev <mjt@corpit.ru>
Copyright (C) 2006 Mikael Magnusson <mikma@users.sourceforge.net>
This file is part of UDNS library, an async DNS stub resolver.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library, in file named COPYING.LGPL; if not,
write to the Free Software Foundation, Inc., 59 Temple Place,
Suite 330, Boston, MA 02111-1307 USA
*/
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include "udns.h"
/* Get a single string for NAPTR record, pretty much like a DN label.
* String length is in first byte in *cur, so it can't be >255.
*/
static int dns_getstr(dnscc_t **cur, dnscc_t *ep, char *buf)
{
unsigned l;
dnscc_t *cp = *cur;
l = *cp++;
if (cp + l > ep)
return DNS_E_PROTOCOL;
if (buf) {
memcpy(buf, cp, l);
buf[l] = '\0';
}
cp += l;
*cur = cp;
return l + 1;
}
int
dns_parse_naptr(dnscc_t *qdn, dnscc_t *pkt, dnscc_t *cur, dnscc_t *end,
void **result) {
struct dns_rr_naptr *ret;
struct dns_parse p;
struct dns_rr rr;
int r, l;
char *sp;
dnsc_t dn[DNS_MAXDN];
assert(dns_get16(cur+2) == DNS_C_IN && dns_get16(cur+0) == DNS_T_NAPTR);
/* first, validate the answer and count size of the result */
l = 0;
dns_initparse(&p, qdn, pkt, cur, end);
while((r = dns_nextrr(&p, &rr)) > 0) {
int i;
dnscc_t *ep = rr.dnsrr_dend;
/* first 4 bytes: order & preference */
cur = rr.dnsrr_dptr + 4;
/* flags, services and regexp */
for (i = 0; i < 3; i++) {
r = dns_getstr(&cur, ep, NULL);
if (r < 0)
return r;
l += r;
}
/* replacement */
r = dns_getdn(pkt, &cur, end, dn, sizeof(dn));
if (r <= 0 || cur != rr.dnsrr_dend)
return DNS_E_PROTOCOL;
l += dns_dntop_size(dn);
}
if (r < 0)
return DNS_E_PROTOCOL;
if (!p.dnsp_nrr)
return DNS_E_NODATA;
/* next, allocate and set up result */
l += dns_stdrr_size(&p);
ret = malloc(sizeof(*ret) + sizeof(struct dns_naptr) * p.dnsp_nrr + l);
if (!ret)
return DNS_E_NOMEM;
ret->dnsnaptr_nrr = p.dnsp_nrr;
ret->dnsnaptr_naptr = (struct dns_naptr *)(ret+1);
/* and 3rd, fill in result, finally */
sp = (char*)(&ret->dnsnaptr_naptr[p.dnsp_nrr]);
for (dns_rewind(&p, qdn), r = 0; dns_nextrr(&p, &rr); ++r) {
cur = rr.dnsrr_dptr;
ret->dnsnaptr_naptr[r].order = dns_get16(cur); cur += 2;
ret->dnsnaptr_naptr[r].preference = dns_get16(cur); cur += 2;
sp += dns_getstr(&cur, end, (ret->dnsnaptr_naptr[r].flags = sp));
sp += dns_getstr(&cur, end, (ret->dnsnaptr_naptr[r].service = sp));
sp += dns_getstr(&cur, end, (ret->dnsnaptr_naptr[r].regexp = sp));
dns_getdn(pkt, &cur, end, dn, sizeof(dn));
sp += dns_dntop(dn, (ret->dnsnaptr_naptr[r].replacement = sp), DNS_MAXNAME);
}
dns_stdrr_finish((struct dns_rr_null *)ret, sp, &p);
*result = ret;
return 0;
}
struct dns_query *
dns_submit_naptr(struct dns_ctx *ctx, const char *name, int flags,
dns_query_naptr_fn *cbck, void *data) {
return
dns_submit_p(ctx, name, DNS_C_IN, DNS_T_NAPTR, flags,
dns_parse_naptr, (dns_query_fn *)cbck, data);
}
struct dns_rr_naptr *
dns_resolve_naptr(struct dns_ctx *ctx, const char *name, int flags) {
return (struct dns_rr_naptr *)
dns_resolve_p(ctx, name, DNS_C_IN, DNS_T_NAPTR, flags, dns_parse_naptr);
}

109
contrib/udns/udns_rr_ptr.c Normal file
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@ -0,0 +1,109 @@
/* udns_rr_ptr.c
parse/query PTR records
Copyright (C) 2005 Michael Tokarev <mjt@corpit.ru>
This file is part of UDNS library, an async DNS stub resolver.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library, in file named COPYING.LGPL; if not,
write to the Free Software Foundation, Inc., 59 Temple Place,
Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdlib.h>
#include <assert.h>
#include "udns.h"
int
dns_parse_ptr(dnscc_t *qdn, dnscc_t *pkt, dnscc_t *cur, dnscc_t *end,
void **result) {
struct dns_rr_ptr *ret;
struct dns_parse p;
struct dns_rr rr;
int r, l, c;
char *sp;
dnsc_t ptr[DNS_MAXDN];
assert(dns_get16(cur+2) == DNS_C_IN && dns_get16(cur+0) == DNS_T_PTR);
/* first, validate the answer and count size of the result */
l = c = 0;
dns_initparse(&p, qdn, pkt, cur, end);
while((r = dns_nextrr(&p, &rr)) > 0) {
cur = rr.dnsrr_dptr;
r = dns_getdn(pkt, &cur, end, ptr, sizeof(ptr));
if (r <= 0 || cur != rr.dnsrr_dend)
return DNS_E_PROTOCOL;
l += dns_dntop_size(ptr);
++c;
}
if (r < 0)
return DNS_E_PROTOCOL;
if (!c)
return DNS_E_NODATA;
/* next, allocate and set up result */
ret = malloc(sizeof(*ret) + sizeof(char **) * c + l + dns_stdrr_size(&p));
if (!ret)
return DNS_E_NOMEM;
ret->dnsptr_nrr = c;
ret->dnsptr_ptr = (char **)(ret+1);
/* and 3rd, fill in result, finally */
sp = (char*)(ret->dnsptr_ptr + c);
c = 0;
dns_rewind(&p, qdn);
while((r = dns_nextrr(&p, &rr)) > 0) {
ret->dnsptr_ptr[c] = sp;
cur = rr.dnsrr_dptr;
dns_getdn(pkt, &cur, end, ptr, sizeof(ptr));
sp += dns_dntop(ptr, sp, DNS_MAXNAME);
++c;
}
dns_stdrr_finish((struct dns_rr_null *)ret, sp, &p);
*result = ret;
return 0;
}
struct dns_query *
dns_submit_a4ptr(struct dns_ctx *ctx, const struct in_addr *addr,
dns_query_ptr_fn *cbck, void *data) {
dnsc_t dn[DNS_A4RSIZE];
dns_a4todn(addr, 0, dn, sizeof(dn));
return
dns_submit_dn(ctx, dn, DNS_C_IN, DNS_T_PTR, DNS_NOSRCH,
dns_parse_ptr, (dns_query_fn *)cbck, data);
}
struct dns_rr_ptr *
dns_resolve_a4ptr(struct dns_ctx *ctx, const struct in_addr *addr) {
return (struct dns_rr_ptr *)
dns_resolve(ctx, dns_submit_a4ptr(ctx, addr, NULL, NULL));
}
struct dns_query *
dns_submit_a6ptr(struct dns_ctx *ctx, const struct in6_addr *addr,
dns_query_ptr_fn *cbck, void *data) {
dnsc_t dn[DNS_A6RSIZE];
dns_a6todn(addr, 0, dn, sizeof(dn));
return
dns_submit_dn(ctx, dn, DNS_C_IN, DNS_T_PTR, DNS_NOSRCH,
dns_parse_ptr, (dns_query_fn *)cbck, data);
}
struct dns_rr_ptr *
dns_resolve_a6ptr(struct dns_ctx *ctx, const struct in6_addr *addr) {
return (struct dns_rr_ptr *)
dns_resolve(ctx, dns_submit_a6ptr(ctx, addr, NULL, NULL));
}

155
contrib/udns/udns_rr_srv.c Normal file
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@ -0,0 +1,155 @@
/* udns_rr_srv.c
parse/query SRV IN (rfc2782) records
Copyright (C) 2005 Michael Tokarev <mjt@corpit.ru>
This file is part of UDNS library, an async DNS stub resolver.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library, in file named COPYING.LGPL; if not,
write to the Free Software Foundation, Inc., 59 Temple Place,
Suite 330, Boston, MA 02111-1307 USA
Copyright 2005 Thadeu Lima de Souza Cascardo <cascardo@minaslivre.org>
2005-09-11:
Changed MX parser file into a SRV parser file
*/
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include "udns.h"
int
dns_parse_srv(dnscc_t *qdn, dnscc_t *pkt, dnscc_t *cur, dnscc_t *end,
void **result) {
struct dns_rr_srv *ret;
struct dns_parse p;
struct dns_rr rr;
int r, l;
char *sp;
dnsc_t srv[DNS_MAXDN];
assert(dns_get16(cur+2) == DNS_C_IN && dns_get16(cur+0) == DNS_T_SRV);
/* first, validate the answer and count size of the result */
l = 0;
dns_initparse(&p, qdn, pkt, cur, end);
while((r = dns_nextrr(&p, &rr)) > 0) {
cur = rr.dnsrr_dptr + 6;
r = dns_getdn(pkt, &cur, end, srv, sizeof(srv));
if (r <= 0 || cur != rr.dnsrr_dend)
return DNS_E_PROTOCOL;
l += dns_dntop_size(srv);
}
if (r < 0)
return DNS_E_PROTOCOL;
if (!p.dnsp_nrr)
return DNS_E_NODATA;
/* next, allocate and set up result */
l += dns_stdrr_size(&p);
ret = malloc(sizeof(*ret) + sizeof(struct dns_srv) * p.dnsp_nrr + l);
if (!ret)
return DNS_E_NOMEM;
ret->dnssrv_nrr = p.dnsp_nrr;
ret->dnssrv_srv = (struct dns_srv *)(ret+1);
/* and 3rd, fill in result, finally */
sp = (char*)(ret->dnssrv_srv + p.dnsp_nrr);
for (dns_rewind(&p, qdn), r = 0; dns_nextrr(&p, &rr); ++r) {
ret->dnssrv_srv[r].name = sp;
cur = rr.dnsrr_dptr;
ret->dnssrv_srv[r].priority = dns_get16(cur);
ret->dnssrv_srv[r].weight = dns_get16(cur+2);
ret->dnssrv_srv[r].port = dns_get16(cur+4);
cur += 6;
dns_getdn(pkt, &cur, end, srv, sizeof(srv));
sp += dns_dntop(srv, sp, DNS_MAXNAME);
}
dns_stdrr_finish((struct dns_rr_null *)ret, sp, &p);
*result = ret;
return 0;
}
/* Add a single service or proto name prepending an undescore (_),
* according to rfc2782 rules.
* Return 0 or the label length.
* Routing assumes dn holds enouth space for a single DN label. */
static int add_sname(dnsc_t *dn, const char *sn) {
int l = dns_ptodn(sn, 0, dn + 1, DNS_MAXLABEL-1, NULL);
if (l <= 1 || l - 2 != dn[1])
/* Should we really check if sn is exactly one label? Do we care? */
return 0;
dn[0] = l - 1;
dn[1] = '_';
return l;
}
/* Construct a domain name for SRV query from the given name, service and proto.
* The code allows any combinations of srv and proto (both are non-NULL,
* both NULL, or either one is non-NULL). Whenever it makes any sense or not
* is left as an exercise to programmer.
* Return negative value on error (malformed query) or addition query flag(s).
*/
static int
build_srv_dn(dnsc_t *dn, const char *name, const char *srv, const char *proto)
{
int p = 0, l, isabs;
if (srv) {
l = add_sname(dn + p, srv);
if (!l)
return -1;
p += l;
}
if (proto) {
l = add_sname(dn + p, proto);
if (!l)
return -1;
p += l;
}
l = dns_ptodn(name, 0, dn + p, DNS_MAXDN - p, &isabs);
if (l < 0)
return -1;
return isabs ? DNS_NOSRCH : 0;
}
struct dns_query *
dns_submit_srv(struct dns_ctx *ctx,
const char *name, const char *srv, const char *proto,
int flags, dns_query_srv_fn *cbck, void *data) {
dnsc_t dn[DNS_MAXDN];
int r = build_srv_dn(dn, name, srv, proto);
if (r < 0) {
dns_setstatus (ctx, DNS_E_BADQUERY);
return NULL;
}
return
dns_submit_dn(ctx, dn, DNS_C_IN, DNS_T_SRV, flags | r,
dns_parse_srv, (dns_query_fn *)cbck, data);
}
struct dns_rr_srv *
dns_resolve_srv(struct dns_ctx *ctx,
const char *name, const char *srv, const char *proto, int flags)
{
dnsc_t dn[DNS_MAXDN];
int r = build_srv_dn(dn, name, srv, proto);
if (r < 0) {
dns_setstatus(ctx, DNS_E_BADQUERY);
return NULL;
}
return (struct dns_rr_srv *)
dns_resolve_dn(ctx, dn, DNS_C_IN, DNS_T_SRV, flags | r, dns_parse_srv);
}

98
contrib/udns/udns_rr_txt.c Normal file
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@ -0,0 +1,98 @@
/* udns_rr_txt.c
parse/query TXT records
Copyright (C) 2005 Michael Tokarev <mjt@corpit.ru>
This file is part of UDNS library, an async DNS stub resolver.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library, in file named COPYING.LGPL; if not,
write to the Free Software Foundation, Inc., 59 Temple Place,
Suite 330, Boston, MA 02111-1307 USA
*/
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include "udns.h"
int
dns_parse_txt(dnscc_t *qdn, dnscc_t *pkt, dnscc_t *cur, dnscc_t *end,
void **result) {
struct dns_rr_txt *ret;
struct dns_parse p;
struct dns_rr rr;
int r, l;
dnsc_t *sp;
dnscc_t *cp, *ep;
assert(dns_get16(cur+0) == DNS_T_TXT);
/* first, validate the answer and count size of the result */
l = 0;
dns_initparse(&p, qdn, pkt, cur, end);
while((r = dns_nextrr(&p, &rr)) > 0) {
cp = rr.dnsrr_dptr; ep = rr.dnsrr_dend;
while(cp < ep) {
r = *cp++;
if (cp + r > ep)
return DNS_E_PROTOCOL;
l += r;
cp += r;
}
}
if (r < 0)
return DNS_E_PROTOCOL;
if (!p.dnsp_nrr)
return DNS_E_NODATA;
/* next, allocate and set up result */
l += (sizeof(struct dns_txt) + 1) * p.dnsp_nrr + dns_stdrr_size(&p);
ret = malloc(sizeof(*ret) + l);
if (!ret)
return DNS_E_NOMEM;
ret->dnstxt_nrr = p.dnsp_nrr;
ret->dnstxt_txt = (struct dns_txt *)(ret+1);
/* and 3rd, fill in result, finally */
sp = (dnsc_t*)(ret->dnstxt_txt + p.dnsp_nrr);
for(dns_rewind(&p, qdn), r = 0; dns_nextrr(&p, &rr) > 0; ++r) {
ret->dnstxt_txt[r].txt = sp;
cp = rr.dnsrr_dptr; ep = rr.dnsrr_dend;
while(cp < ep) {
l = *cp++;
memcpy(sp, cp, l);
sp += l;
cp += l;
}
ret->dnstxt_txt[r].len = sp - ret->dnstxt_txt[r].txt;
*sp++ = '\0';
}
dns_stdrr_finish((struct dns_rr_null *)ret, (char*)sp, &p);
*result = ret;
return 0;
}
struct dns_query *
dns_submit_txt(struct dns_ctx *ctx, const char *name, int qcls, int flags,
dns_query_txt_fn *cbck, void *data) {
return
dns_submit_p(ctx, name, qcls, DNS_T_TXT, flags,
dns_parse_txt, (dns_query_fn *)cbck, data);
}
struct dns_rr_txt *
dns_resolve_txt(struct dns_ctx *ctx, const char *name, int qcls, int flags) {
return (struct dns_rr_txt *)
dns_resolve_p(ctx, name, qcls, DNS_T_TXT, flags, dns_parse_txt);
}

41
src/Access/Common/AllowedClientHosts.cpp
View File

@ -110,18 +110,23 @@ namespace
}
/// Returns the host name by its address.
String getHostByAddress(const IPAddress & address)
std::vector<String> getHostsByAddress(const IPAddress & address)
{
String host = DNSResolver::instance().reverseResolve(address);
std::vector<String> hosts = DNSResolver::instance().reverseResolve(address);
/// Check that PTR record is resolved back to client address
if (!isAddressOfHost(address, host))
throw Exception("Host " + String(host) + " isn't resolved back to " + address.toString(), ErrorCodes::DNS_ERROR);
if (hosts.empty())
throw Exception(address.toString() + " could not be resolved", ErrorCodes::DNS_ERROR);
return host;
for (auto & host : hosts) {
/// Check that PTR record is resolved back to client address
if (!isAddressOfHost(address, host))
throw Exception("Host " + String(host) + " isn't resolved back to " + address.toString(), ErrorCodes::DNS_ERROR);
}
return hosts;
}
void parseLikePatternIfIPSubnet(const String & pattern, IPSubnet & subnet, IPAddress::Family address_family)
{
size_t slash = pattern.find('/');
@ -520,20 +525,26 @@ bool AllowedClientHosts::contains(const IPAddress & client_address) const
return true;
/// Check `name_regexps`.
std::optional<String> resolved_host;
std::optional<std::vector<String>> resolved_hosts;
auto check_name_regexp = [&](const String & name_regexp_)
{
try
{
if (boost::iequals(name_regexp_, "localhost"))
return is_client_local();
if (!resolved_host)
resolved_host = getHostByAddress(client_v6);
if (resolved_host->empty())
return false;
Poco::RegularExpression re(name_regexp_);
Poco::RegularExpression::Match match;
return re.match(*resolved_host, match) != 0;
if (!resolved_hosts) {
resolved_hosts = getHostsByAddress(client_address);
}
for (const auto & host : resolved_hosts.value()) {
Poco::RegularExpression re(name_regexp_);
Poco::RegularExpression::Match match;
if (re.match(host, match) != 0) {
return true;
}
}
return false;
}
catch (const Exception & e)
{

10
src/CMakeLists.txt
View File

@ -355,6 +355,8 @@ target_link_libraries(clickhouse_common_io
ch_contrib::zlib
pcg_random
Poco::Foundation
ch_contrib::udns
ch_contrib::cpp-dns
)
if (TARGET ch_contrib::cpuid)
@ -439,6 +441,14 @@ if (TARGET ch_contrib::avrocpp)
dbms_target_link_libraries(PRIVATE ch_contrib::avrocpp)
endif ()
if (TARGET ch_contrib::udns)
dbms_target_link_libraries(PRIVATE ch_contrib::udns)
endif ()
if (TARGET ch_contrib::cpp-dns)
dbms_target_link_libraries(PRIVATE ch_contrib::cpp-dns)
endif ()
if (TARGET OpenSSL::Crypto)
dbms_target_link_libraries (PRIVATE OpenSSL::Crypto)
target_link_libraries (clickhouse_common_io PRIVATE OpenSSL::Crypto)

31
src/Common/DNSResolver.cpp
View File

@ -12,6 +12,8 @@
#include <atomic>
#include <optional>
#include <string_view>
#include <boost/asio.hpp>
#include <DNSResolver.hpp>
namespace ProfileEvents
{
@ -138,16 +140,27 @@ static DNSResolver::IPAddresses resolveIPAddressImpl(const std::string & host)
return addresses;
}
static String reverseResolveImpl(const Poco::Net::IPAddress & address)
static std::vector<String> reverseResolveImpl(const Poco::Net::IPAddress & address)
{
Poco::Net::SocketAddress sock_addr(address, 0);
boost::asio::io_service ioService;
YukiWorkshop::DNSResolver resolver(ioService);
/// Resolve by hand, because Poco::Net::DNS::hostByAddress(...) does getaddrinfo(...) after getnameinfo(...)
char host[1024];
int err = getnameinfo(sock_addr.addr(), sock_addr.length(), host, sizeof(host), nullptr, 0, NI_NAMEREQD);
if (err)
throw Exception("Cannot getnameinfo(" + address.toString() + "): " + gai_strerror(err), ErrorCodes::DNS_ERROR);
return host;
std::vector<std::string> ptrRecords;
resolver.resolve_a4ptr(boost::asio::ip::address_v4::from_string(address.toString()), [&](int err, auto& hosts, auto&, auto&, uint) {
if (err) {
throw Exception("Cannot resolve: " + address.toString() + gai_strerror(err), ErrorCodes::DNS_ERROR);
}
for (auto &it : hosts) {
ptrRecords.emplace_back(it);
}
});
ioService.run();
return ptrRecords;
}
struct DNSResolver::Impl
@ -235,7 +248,7 @@ std::vector<Poco::Net::SocketAddress> DNSResolver::resolveAddressList(const std:
return addresses;
}
String DNSResolver::reverseResolve(const Poco::Net::IPAddress & address)
std::vector<String> DNSResolver::reverseResolve(const Poco::Net::IPAddress & address)
{
if (impl->disable_cache)
return reverseResolveImpl(address);

4
src/Common/DNSResolver.h
View File

@ -36,8 +36,8 @@ public:
std::vector<Poco::Net::SocketAddress> resolveAddressList(const std::string & host, UInt16 port);
/// Accepts host IP and resolves its host name
String reverseResolve(const Poco::Net::IPAddress & address);
/// Accepts host IP and resolves its host names
std::vector<String> reverseResolve(const Poco::Net::IPAddress & address);
/// Get this server host name
String getHostName();