int main(int argc, char *argv[]) {
if (argc == 1)
parse_config("dns_proxy.conf");
else if (argc == 2) {
if (!strcmp(argv[1], "-h")) {
printf("Usage: %s [options]\n", argv[0]);
printf(" * With no parameters, the configuration file is read from 'dns_proxy.conf'.\n\n");
printf(" -n -- No configuration file (socks: 127.0.0.1:9999, listener: 0.0.0.0:53).\n");
printf(" -h -- Print this message and exit.\n");
printf(" config_file -- Read from specified configuration file.\n\n");
printf(" * The configuration file should contain any of the following options (and ignores lines that begin with '#'):\n");
printf(" * socks_addr -- socks listener address\n");
printf(" * socks_port -- socks listener port\n");
printf(" * listen_addr -- address for the dns proxy to listen on\n");
printf(" * listen_port -- port for the dns proxy to listen on (most cases 53)\n");
printf(" * resolv_conf -- location of resolv.conf to read from\n");
printf(" * log_file -- location to log server IPs to. (only necessary for debugging)\n\n");
printf(" * Configuration directives should be of the format:\n");
printf(" option = value\n\n");
printf(" * Any non-specified options will be set to their defaults:\n");
printf(" * socks_addr = 127.0.0.1\n");
printf(" * socks_port = 9050\n");
printf(" * listen_addr = 0.0.0.0\n");
printf(" * listen_port = 53\n");
printf(" * resolv_conf = resolv.conf\n");
printf(" * log_file = /dev/null\n");
exit(0);
}
else {
parse_config(argv[1]);
}
}
// if (getuid() != 0) {
// printf("Error: this program must be run as root! Quitting\n");
// exit(1);
// }
printf("[*] Listening on: %s:%d\n", LISTEN_ADDR, LISTEN_PORT);
printf("[*] Using SOCKS proxy: %s:%d\n", SOCKS_ADDR, SOCKS_PORT);
parse_resolv_conf();
printf("[*] Loaded %d DNS servers from %s.\n\n", NUM_DNS, RESOLVCONF);
// start the dns proxy
udp_listener();
exit(EXIT_SUCCESS);
}
int nepim_udp_listener(const char *ssm_source,
const char *hostname,
const char *portname,
int mcast_join,
const char *join_iface)
{
struct addrinfo hints;
struct addrinfo *ai_res;
struct addrinfo *ai;
int result;
int udp_listeners = 0;
if (!ssm_source)
return udp_listener(0 /* ssm_source */,
0 /* ssm_source_addr */,
-1 /* ssm_source_addrlen */,
hostname,
portname,
mcast_join,
join_iface);
memset(&hints, 0, sizeof(hints));
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;
hints.ai_flags = AI_PASSIVE | AI_CANONNAME;
hints.ai_family = PF_UNSPEC;
hints.ai_addrlen = 0;
hints.ai_addr = 0;
hints.ai_canonname = 0;
result = getaddrinfo(ssm_source, 0, &hints, &ai_res);
if (result) {
fprintf(stderr, "%s: getaddrinfo(%s): %s\n",
__PRETTY_FUNCTION__,
ssm_source, gai_strerror(result));
return 0;
}
/* Scan ssm_source addresses */
for (ai = ai_res; ai; ai = ai->ai_next) {
if (nepim_global.no_inet6 && (ai->ai_family == PF_INET6))
continue;
if (nepim_global.no_inet4 && (ai->ai_family == PF_INET))
continue;
udp_listeners += udp_listener(ssm_source,
ai->ai_addr,
ai->ai_addrlen,
hostname,
portname,
mcast_join,
join_iface);
}
freeaddrinfo(ai_res);
return udp_listeners;
}