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, 5 insertions, 0 deletions

diff --git a/passt.c b/passt.c
index d0dcb26..6b6a317 100644
--- a/passt.c
+++ b/passt.c
@@ -53,6 +53,7 @@
 #include "icmp.h"
 #include "tcp.h"
 #include "udp.h"
+#include "pcap.h"
 
 #define EPOLL_EVENTS		10
 
@@ -601,6 +602,8 @@ static int tap_handler(struct ctx *c, struct timespec *now)
 					return 0;
 			}
 
+			pcap(p, len);
+
 			msg[msg_count].start = p;
 			msg[msg_count++].len = len;
 
@@ -792,6 +795,8 @@ int main(int argc, char **argv)
 
 	memset(&c.mac_guest, 0xff, sizeof(c.mac_guest));
 
+	pcap_init();
+
 	if (c.v4) {
 		info("ARP:");
 		info("    address: %02x:%02x:%02x:%02x:%02x:%02x from %s",