colin/passt
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

tap: Add informational messages for UNIX domain socket connections

Browse Source 
...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>
This commit is contained in:
Stefano Brivio
2022-06-16 15:06:05 +02:00
parent fca5e11773
commit 7af0bae4ce
1 changed files with 10 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
tap.c
View File

@@ -856,12 +856,19 @@ static void tap_sock_unix_new(struct ctx *c)
{
struct epoll_event ev = { 0 };
int v = INT_MAX / 2;
struct ucred ucred;
socklen_t len;
len = sizeof(ucred);
/* Another client is already connected: accept and close right away. */
if (c->fd_tap != -1) {
int discard = accept4(c->fd_tap_listen, NULL, NULL,
SOCK_NONBLOCK);
if (!getsockopt(discard, SOL_SOCKET, SO_PEERCRED, &ucred, &len))
info("discarding connection from PID %i", ucred.pid);
if (discard != -1)
close(discard);
@@ -870,6 +877,9 @@ static void tap_sock_unix_new(struct ctx *c)
c->fd_tap = accept4(c->fd_tap_listen, NULL, NULL, 0);
if (!getsockopt(c->fd_tap, SOL_SOCKET, SO_PEERCRED, &ucred, &len))
info("accepted connection from PID %i", ucred.pid);
if (!c->low_rmem &&
setsockopt(c->fd_tap, SOL_SOCKET, SO_RCVBUF, &v, sizeof(v)))
trace("tap: failed to set SO_RCVBUF to %i", v);