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inode based singleton

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This commit is contained in:
Yakov Olkhovskiy 2022-08-24 21:05:00 +00:00
parent d11d494587
commit 6afd9c176b
1 changed files with 71 additions and 0 deletions
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71
utils/self-extracting-executable/decompressor.cpp
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@ -13,6 +13,8 @@
#include <cstring>
#include <iostream>
#include <filesystem>
#include <fstream>
#include <sstream>
#if (defined(OS_DARWIN) || defined(OS_FREEBSD)) && defined(__GNUC__)
# include <machine/endian.h>
@ -359,6 +361,27 @@ int decompressFiles(int input_fd, char * path, char * name, bool & have_compress
#endif
uint32_t get_inode(const char * self)
{
std::ifstream maps("/proc/self/maps");
if (maps.fail())
{
perror("open maps");
return 0;
}
for (std::string line; std::getline(maps, line); )
{
std::stringstream ss(line);
std::string addr, mode, offset, id, path;
uint32_t inode = 0;
if (ss >> addr >> mode >> offset >> id >> inode >> path && path == self)
return inode;
}
return 0;
}
int main(int/* argc*/, char* argv[])
{
char self[4096] = {0};
@ -382,6 +405,52 @@ int main(int/* argc*/, char* argv[])
else
name = file_path;
uint32_t inode = get_inode(self);
if (inode == 0)
{
std::cerr << "Unable to obtain inode." << std::endl;
return 1;
}
std::stringstream lock_path;
lock_path << "/tmp/" << name << ".decompression." << inode << ".lock";
int lock = open(lock_path.str().c_str(), O_CREAT | O_RDWR, 0666);
if (lock < 0)
{
perror("lock open");
return 1;
}
if (lockf(lock, F_LOCK, 0))
{
perror("lockf");
return 1;
}
struct stat input_info;
if (0 != stat(self, &input_info))
{
perror("stat");
return 1;
}
/// if decompression was performed by another process
if (input_info.st_ino != inode)
{
struct stat lock_info;
if (0 != fstat(lock, &lock_info))
{
perror("fstat lock");
return 1;
}
if (lock_info.st_size == 1)
execv(self, argv);
printf("No target executable - decompression only was performed.\n");
return 0;
}
int input_fd = open(self, O_RDONLY);
if (input_fd == -1)
{
@ -443,6 +512,8 @@ int main(int/* argc*/, char* argv[])
if (has_exec)
{
write(lock, "1", 1);
execv(self, argv);
/// This part of code will be reached only if error happened