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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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6
net.c
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@@ -185,7 +185,7 @@ int drop_privileges(char *user, char *chrootdir) {
return 0;
}
int start_listener (char *inip, char *inpt, char *srcip, char *dstip,
int start_listener (char *inip, char *inpt, char *srcip, char *srcpt, char *dstip,
char *dstpt, char *pidfile, char *chrootdir, char *user) {
host_t *listen_h, *dst_h, *bind_h;
@@ -208,7 +208,7 @@ int start_listener (char *inip, char *inpt, char *srcip, char *dstip,
bind_h = NULL;
if(srcip != NULL) {
bind_h = get_host(srcip, 0, NULL, NULL);
bind_h = get_host(srcip, atoi(srcpt), NULL, NULL);
}
else {
if(dst_h->is_v6)
@@ -298,6 +298,8 @@ void handle_inside(int inside, host_t *listen_h, host_t *bind_h, host_t *dst_h)
src_h->ip, src_h->port, len, dst_h->ip, dst_h->port);
verb_prbind(bind_h);
if (bind_h->port)
client_clean(1);
output = bindsocket(bind_h);
if (output >= 0) {
/* send req out */