I made working patch on the current master branch:
```diff
--- a/src/core/tcp_main.c
+++ b/src/core/tcp_main.c
@@ -4324,10 +4324,25 @@ static inline int handle_new_connect(struct socket_info
*si)
struct tcp_connection *tcpconn;
socklen_t su_len;
int new_sock;
+ int optval;
/* got a connection on r */
su_len = sizeof(su);
new_sock = accept(si->socket, &(su.s), &su_len);
+
+ if ((optval = TICKS_TO_S(cfg_get(tcp, tcp_cfg, send_timeout)))) {
+ optval *= 1000;
+ if(setsockopt(new_sock, IPPROTO_TCP, TCP_USER_TIMEOUT, &optval,
+ sizeof(optval))
+ < 0) {
+ LM_WARN("failed to set TCP_USER_TIMEOUT: %s\n",
+ strerror(errno));
+ } else {
+ LM_INFO("Set new connection TCP_USER_TIMEOUT=%d ms\n",
optval);
+ }
+ }
+
+
if(unlikely(new_sock == -1)) {
if((errno == EAGAIN) || (errno == EWOULDBLOCK))
return 0;
```
Now the retransmits do what is configured and time out after 3s.
```
Jul 27 18:14:15 p01t-1 kamailio.sbc[1182787]: INFO: <core>
[core/tcp_main.c:4373]: handle_new_connect(): Set new connection
TCP_USER_TIMEOUT=3000 ms
...
Jul 27 18:14:49 p01t-1 kamailio.sbc[1182775]: INFO: sbc:<script>: >>> Sending
Request: INVITE sip:22@192.168.41.157:51151;line=q9yhaejq;ob (10.84.65.131:5082
-> 10.84.65.130:51151: sip:193.84.65.130:51151;transport=tcp)
Jul 27 18:14:52 p01t-1 kamailio.sbc[1182785]: NOTICE: <core>
[core/tcp_read.c:267]: tcp_read_data(): error reading: Connection timed out
(110)
```
Readings:
https://stackoverflow.com/questions/5907527/application-control-of-tcp-retransmission-on-linux
https://man7.org/linux/man-pages/man7/tcp.7.html
Although said "This option, like many others, will be inherited by the socket
returned by [accept(2)](https://man7.org/linux/man-pages/man2/accept.2.html),
if it was set on the listening socket." => NO, it is not inherited (I tried it
after init_sock_keepalive(sock_info->socket); line in tcp_main.c). So it seems
it must be done on the spawned socket in handle_new_connect().
Needs more testing and must be done more pretty.
--
Reply to this email directly or view it on GitHub:
https://github.com/kamailio/kamailio/issues/3443#issuecomment-1653978451
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