mirror of
https://github.com/ClickHouse/ClickHouse.git
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122 lines
3.2 KiB
C++
122 lines
3.2 KiB
C++
#include "DNSResolver.h"
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#include <Common/SimpleCache.h>
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#include <Common/Exception.h>
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#include <Core/Types.h>
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#include <Poco/Net/DNS.h>
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#include <Poco/Net/NetException.h>
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#include <Poco/NumberParser.h>
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#include <arpa/inet.h>
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#include <atomic>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int BAD_ARGUMENTS;
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}
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/// Slightly altered implementation from https://github.com/pocoproject/poco/blob/poco-1.6.1/Net/src/SocketAddress.cpp#L86
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static void splitHostAndPort(const std::string & host_and_port, std::string & out_host, UInt16 & out_port)
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{
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String port_str;
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out_host.clear();
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auto it = host_and_port.begin();
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auto end = host_and_port.end();
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if (*it == '[') /// Try parse case '[<IPv6 or something else>]:<port>'
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{
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++it;
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while (it != end && *it != ']')
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out_host += *it++;
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if (it == end)
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throw Exception("Malformed IPv6 address", ErrorCodes::BAD_ARGUMENTS);
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++it;
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}
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else /// Case '<IPv4 or domain name or something else>:<port>'
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{
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while (it != end && *it != ':')
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out_host += *it++;
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}
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if (it != end && *it == ':')
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{
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++it;
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while (it != end)
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port_str += *it++;
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}
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else
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throw Exception("Missing port number", ErrorCodes::BAD_ARGUMENTS);
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unsigned port;
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if (Poco::NumberParser::tryParseUnsigned(port_str, port) && port <= 0xFFFF)
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{
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out_port = static_cast<UInt16>(port);
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}
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else
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{
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struct servent * se = getservbyname(port_str.c_str(), nullptr);
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if (se)
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out_port = ntohs(static_cast<UInt16>(se->s_port));
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else
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throw Exception("Service not found", ErrorCodes::BAD_ARGUMENTS);
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}
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}
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static Poco::Net::IPAddress resolveIPAddressImpl(const std::string & host)
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{
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/// NOTE: Poco::Net::DNS::resolveOne(host) doesn't work for IP addresses like 127.0.0.2
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/// Therefore we use SocketAddress constructor with dummy port to resolve IP
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return Poco::Net::SocketAddress(host, 0U).host();
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}
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struct DNSResolver::Impl
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{
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SimpleCache<decltype(resolveIPAddressImpl), &resolveIPAddressImpl> cache_host;
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/// If disabled, will not make cache lookups, will resolve addresses manually on each call
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std::atomic<bool> disable_cache{false};
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};
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DNSResolver::DNSResolver() : impl(std::make_unique<DNSResolver::Impl>()) {}
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Poco::Net::IPAddress DNSResolver::resolveHost(const std::string & host)
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{
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return !impl->disable_cache ? impl->cache_host(host) : resolveIPAddressImpl(host);
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}
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Poco::Net::SocketAddress DNSResolver::resolveAddress(const std::string & host_and_port)
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{
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String host;
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UInt16 port;
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splitHostAndPort(host_and_port, host, port);
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return !impl->disable_cache ? Poco::Net::SocketAddress(impl->cache_host(host), port) : Poco::Net::SocketAddress(host_and_port);
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}
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Poco::Net::SocketAddress DNSResolver::resolveAddress(const std::string & host, UInt16 port)
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{
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return !impl->disable_cache ? Poco::Net::SocketAddress(impl->cache_host(host), port) : Poco::Net::SocketAddress(host, port);
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}
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void DNSResolver::dropCache()
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{
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impl->cache_host.drop();
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}
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void DNSResolver::setDisableCacheFlag(bool is_disabled)
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{
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impl->disable_cache = is_disabled;
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}
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DNSResolver::~DNSResolver() = default;
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}
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