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Implement promiscuous (dumb) mode by binding port on outgoing socket

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This mode is useful for services which cannot handle multiple clients.
Also useful for NAT traversal.

All outgoing packets would be transmitted from a single "client" (UDP port).
Moreover, only one (latest) proxy client receives the reply.
This commit is contained in:
ValdikSS
2017-04-13 00:59:14 +03:00
parent 1f8f9b591b
commit b750cefb00
3 changed files with 21 additions and 12 deletions
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25
udpxd.c
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@@ -92,7 +92,8 @@ void usage() {
"Usage: udpxd [-lbdfpvhV]\n\n"
"Options:\n"
"--listen -l <ip:port> listen for incoming requests\n"
"--bind -b <ip> bind ip used for outgoing requests\n"
"--bind -b <ip[:port]> bind ip used for outgoing requests\n"
" specify port for promiscuous mode\n"
"--to -t <ip:port> destination to forward requests to\n"
"--daemon -d daemon mode, fork into background\n"
"--pidfile -p <file> pidfile, default: /var/run/udpxd.pid\n"
@@ -110,7 +111,7 @@ void usage() {
int main ( int argc, char* argv[] ) {
int opt, err;
char *inip, *inpt, *srcip, *dstip, *dstpt;
char *inip, *inpt, *srcip, *srcpt, *dstip, *dstpt;
char pidfile[MAX_BUFFER_SIZE];
char user[128];
char chroot[MAX_BUFFER_SIZE];
@@ -135,7 +136,7 @@ int main ( int argc, char* argv[] ) {
return 1;
}
srcip = dstip = inip = dstpt = inpt = NULL;
srcip = srcpt = dstip = inip = dstpt = inpt = NULL;
/* set defaults */
strncpy(pidfile, "/var/run/udpxd.pid", 19);
@@ -171,19 +172,23 @@ int main ( int argc, char* argv[] ) {
dstip = malloc(INET6_ADDRSTRLEN+1);
dstpt = malloc(6);
if (parse_ip(optarg, dstip, dstpt) != 0) {
fprintf(stderr, "Parameter -d has the format <ip-address:port>!\n");
fprintf(stderr, "Parameter -t has the format <ip-address:port>!\n");
err = 1;
}
break;
case 'b':
srcip = malloc(INET6_ADDRSTRLEN+1);
if(strlen(optarg) > INET6_ADDRSTRLEN) {
srcip = malloc(INET6_ADDRSTRLEN+1+5); // +5 is for port
srcpt = malloc(6);
if(strlen(optarg) > INET6_ADDRSTRLEN+5) {
fprintf(stderr, "Bind ip address is too long!\n");
err = 1;
}
else {
strncpy(srcip, optarg, INET6_ADDRSTRLEN);
srcip[INET6_ADDRSTRLEN-1] = '\0';
if (strchr(optarg, ':') == NULL || parse_ip(optarg, srcip, srcpt) != 0) {
strncpy(srcip, optarg, INET6_ADDRSTRLEN+5);
srcip[INET6_ADDRSTRLEN+5-1] = '\0';
strncpy(srcpt, "0", 2);
}
}
break;
case 'p':
@@ -225,11 +230,13 @@ int main ( int argc, char* argv[] ) {
}
if(! err) {
err = start_listener (inip, inpt, srcip, dstip, dstpt, pidfile, chroot, user);
err = start_listener (inip, inpt, srcip, srcpt, dstip, dstpt, pidfile, chroot, user);
}
if(srcip != NULL)
free(srcip);
if(srcpt != NULL)
free(srcpt);
if(dstip != NULL)
free(dstip);
if(inip != NULL)