On Thu, Jun 16, 2022 at 03:10:47PM +0200, Stefano Brivio wrote:
...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(a)redhat.com>
---
tap.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/tap.c b/tap.c
index 04ceade..23414db 100644
--- a/tap.c
+++ b/tap.c
@@ -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("discardingq connection from PID %i", ucred.pid);
+
"discardingq"
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);
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson