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Add SO_KEEPALIVE support for connection monitoring #43

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Add SO_KEEPALIVE support for connection monitoring #43

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7d68492
Add SO_KEEPALIVE support for connection monitoring
claudiodube Aug 2, 2025
6b7f58d
Simplify keepalive implementation to use system defaults
claudiodube Aug 2, 2025
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14 changes: 14 additions & 0 deletions redir.c
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,7 @@
#include <arpa/inet.h>
#include <netdb.h>
#include <errno.h>
#include <netinet/tcp.h>

#ifdef USE_TCP_WRAPPERS
#include <tcpd.h>
Expand Down Expand Up @@ -977,6 +978,19 @@ static int server_socket(char *addr, int port, int fail)
exit(1);
}

/* Enable TCP keepalive to detect broken connections */
int keepalive = 1;
rc = setsockopt(sd, SOL_SOCKET, SO_KEEPALIVE, &keepalive, sizeof(keepalive));
if (rc != 0) {
if (fail) {
close(sd);
return -1;
}

ERR("Failed setting socket option SO_KEEPALIVE: %s", strerror(errno));
exit(1);
}
DBG("TCP keepalive enabled using system defaults");
/*
* Try to bind the address to the socket.
*/
Expand Down