tap: Add informational messages for UNIX domain socket connections
...namely, as connections are discarded or accepted. This was quite useful to debug an issue with libvirtd failing to start qemu (because passt refused the new connection) as a previous qemu instance was still active. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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1 changed files with 10 additions and 0 deletions
10
tap.c
10
tap.c
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@ -856,12 +856,19 @@ static void tap_sock_unix_new(struct ctx *c)
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{
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struct epoll_event ev = { 0 };
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int v = INT_MAX / 2;
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struct ucred ucred;
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socklen_t len;
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len = sizeof(ucred);
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/* Another client is already connected: accept and close right away. */
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if (c->fd_tap != -1) {
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int discard = accept4(c->fd_tap_listen, NULL, NULL,
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SOCK_NONBLOCK);
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if (!getsockopt(discard, SOL_SOCKET, SO_PEERCRED, &ucred, &len))
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info("discarding connection from PID %i", ucred.pid);
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if (discard != -1)
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close(discard);
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@ -870,6 +877,9 @@ static void tap_sock_unix_new(struct ctx *c)
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c->fd_tap = accept4(c->fd_tap_listen, NULL, NULL, 0);
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if (!getsockopt(c->fd_tap, SOL_SOCKET, SO_PEERCRED, &ucred, &len))
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info("accepted connection from PID %i", ucred.pid);
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if (!c->low_rmem &&
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setsockopt(c->fd_tap, SOL_SOCKET, SO_RCVBUF, &v, sizeof(v)))
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trace("tap: failed to set SO_RCVBUF to %i", v);
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