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// =====================================
// ERROR HANDING - FROM FCUTILS
// =====================================
#include <stdio.h>
#include <stdarg.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#define FORMAT_MAX_SIZE 1024
extern int errno;
void format_with_errno(char * buf, size_t n, char const * format) {
char const * errstr = strerror(errno);
char fmt_err[256];
size_t i = 0,
j = 0;
while(errstr[j] && i < sizeof(fmt_err) - 1) {
if((fmt_err[i++] = errstr[j++]) != '%')
continue;
if(i < sizeof(fmt_err) - 1) {
fmt_err[i++] = '%';
} else {
i--;
}
}
fmt_err[i] = '\0';
snprintf(buf, n, "%s: %s", format, fmt_err);
}
[[noreturn]] void die_errno(char const * format, ...) {
va_list vargs;
va_start (vargs, format);
char buf[FORMAT_MAX_SIZE];
format_with_errno(buf, sizeof(buf), format);
vfprintf(stderr, buf, vargs);
fprintf(stderr, "\n");
exit(1);
va_end(vargs);
}
[[noreturn]] void die(char const * format, ...) {
va_list vargs;
va_start (vargs, format);
vfprintf(stderr, format, vargs);
fprintf(stderr, "\n");
va_end(vargs);
exit(1);
}
void err(char const * format, ...) {
va_list vargs;
va_start (vargs, format);
vfprintf(stderr, format, vargs);
fprintf(stderr, "\n");
va_end(vargs);
}
// =============================================
// COMMAND LINE UTILITY
// =============================================
#include "wg2sd.hpp"
#include <filesystem>
#include <fstream>
#include <iostream>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <grp.h>
[[noreturn]] void die_usage(char const * prog) {
err("Usage: %s [ -o OUTPUT_PATH ] CONFIG_FILE", prog);
die("Use -h for help");
}
void print_help(char const * prog) {
err("Usage: %s [ -o OUTPUT_PATH ] CONFIG_FILE", prog);
err("Options:");
err("-o OUTPUT_PATH\tSet the output path (default is /etc/systemd/network)");
err("-h\t\tDisplay this help message");
exit(EXIT_SUCCESS);
}
using namespace wg2sd;
void write_systemd_file(SystemdFilespec const & filespec, std::string output_path, bool secure) {
std::string full_path = output_path + "/" + filespec.name;
std::ofstream ofs;
if (secure) {
// Set permissions to 0640 before writing the file
umask(0027);
// Open the file
ofs.open(full_path, std::ios::out | std::ios::trunc);
if (!ofs.is_open()) {
die("Failed to open file %s for writing", full_path.c_str());
}
// Change ownership to root:systemd-network
struct group *grp;
grp = getgrnam("systemd-network");
if (grp == nullptr) {
die_errno("Failed to find the 'systemd-network' group");
}
if (chown(full_path.c_str(), 0, grp->gr_gid) != 0) {
die_errno("Failed to change ownership of file %s", full_path.c_str());
}
// Set permissions
if (chmod(full_path.c_str(), S_IRUSR | S_IWUSR | S_IRGRP) != 0) {
die_errno("Failed to set permissions for file %s", full_path.c_str());
}
} else {
ofs.open(full_path, std::ios::out | std::ios::trunc);
if (!ofs.is_open()) {
die_errno("Failed to open file %s for writing", full_path.c_str());
}
}
// Write the contents to the file
ofs << filespec.contents;
if (ofs.fail()) {
die("Failed to write to file %s", full_path.c_str());
}
}
int main(int argc, char ** argv) {
int opt;
std::filesystem::path output_path = "/etc/systemd/network";
while ((opt = getopt(argc, argv, "o:h")) != -1) {
switch (opt) {
case 'o':
output_path = optarg;
break;
case 'h':
print_help(argv[0]);
break;
default: /* '?' */
die_usage(argv[0]);
}
}
if (optind >= argc) {
die_usage(argv[0]);
}
std::filesystem::path config_path = argv[optind];
std::fstream cfg_stream { config_path };
if(!cfg_stream.is_open()) {
die("Failed to open config file %s", config_path.string().c_str());
}
std::string interface_name = interface_name_from_filename(config_path);
SystemdConfig cfg;
try {
cfg = wg2sd::wg2sd(interface_name, cfg_stream, output_path);
} catch(ConfigurationException const & cex) {
const ParsingException * pex = dynamic_cast<const ParsingException *>(&cex);
if(pex && pex->line_no().has_value()) {
die("parsing error (line %llu): %s", pex->line_no().value(), pex->what());
} else {
die("configuration error: %s", cex.what());
}
}
if(!std::filesystem::path(output_path).is_absolute()) {
output_path = std::filesystem::absolute(output_path);
}
write_systemd_file(cfg.netdev, output_path, false);
write_systemd_file(cfg.network, output_path, false);
write_systemd_file(cfg.private_keyfile, output_path, true);
for(SystemdFilespec const & spec : cfg.symmetric_keyfiles) {
write_systemd_file(spec, output_path, true);
}
return 0;
}
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