Give panic access to the sessions transport protocol via the

session number.

bin/varnishd/cache/cache_acceptor.c

@@ -638,7 +638,7 @@ XPORT_Init(void)
 const struct transport *
 XPORT_Find(const char *name)
 {
-	struct transport *xp;
+	const struct transport *xp;
 
 	ASSERT_MGT();
 
@@ -647,3 +647,14 @@ XPORT_Find(const char *name)
 			return (xp);
 	return (NULL);
 }
+
+const struct transport *
+XPORT_ByNumber(uint16_t no)
+{
+	const struct transport *xp;
+
+	VTAILQ_FOREACH(xp, &transports, list)
+		if (xp->number == no)
+			return (xp);
+	return (NULL);
+}

bin/varnishd/cache/cache_panic.c

@@ -445,13 +445,16 @@ pan_sess(struct vsb *vsb, const struct sess *sp)
 	const char *stp;
 	const char *ci;
 	const char *cp;
+	const struct transport *xp;
 
 	VSB_printf(vsb, "sp = %p {\n", sp);
 	if (pan_already(vsb, sp))
 		return;
 	VSB_indent(vsb, 2);
-	VSB_printf(vsb, "fd = %d, vxid = %u\n",
-	    sp->fd, VXID(sp->vxid));
+	xp = XPORT_ByNumber(sp->sattr[SA_TRANSPORT]);
+	VSB_printf(vsb, "fd = %d, vxid = %u, transport = %s\n",
+	    sp->fd, VXID(sp->vxid),
+	    xp == NULL ? "<none>" : xp->name);
 	ci = SES_Get_String_Attr(sp, SA_CLIENT_IP);
 	cp = SES_Get_String_Attr(sp, SA_CLIENT_PORT);
 	VSB_printf(vsb, "client = %s %s,\n", ci, cp);

bin/varnishd/cache/cache_transport.h

@@ -59,3 +59,5 @@ struct transport {
 extern struct transport PROXY_transport;
 extern struct transport HTTP1_transport;
 
+const struct transport *XPORT_ByNumber(uint16_t no);
+