passt: Introduce packet capture implementation

With -DDEBUG, passt now saves guest-side traffic captures in
pcap format at /tmp/passt_<ISO8601 timestamp>.pcap. The timestamp
refers to time and date of start-up.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/tap.c b/tap.c
index 5d2201a..70e4774 100644
--- a/tap.c
+++ b/tap.c
@@ -25,6 +25,7 @@
 
 #include "passt.h"
 #include "util.h"
+#include "pcap.h"
 
 /**
  * tap_send() - Send frame and qemu socket header with indication of length
@@ -39,6 +40,8 @@ int tap_send(int fd, void *data, size_t len, int flags)
 	uint32_t vnet_len = htonl(len);
 	send(fd, &vnet_len, 4, MSG_DONTWAIT | MSG_NOSIGNAL);
 
+	pcap(data, len);
+
 	return send(fd, data, len, flags | MSG_DONTWAIT | MSG_NOSIGNAL);
 }