From: Guus Sliepen <guus@tinc-vpn.org>
Date: Sat, 10 Jan 2015 22:33:55 +0000 (+0100)
Subject: Fix size of type 2 probe replies.
X-Git-Tag: release-1.1pre12~222
X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=commitdiff_plain;h=c26bb47af130d48d003afd29af4d7ea6ad0538c5

Fix size of type 2 probe replies.

Type 2 replies should be as small as possible. The minimum payload size
for probe packets is 14 bytes, otherwise they won't be recognized as
such.
---

diff --git a/src/net_packet.c b/src/net_packet.c
index 8bf399f1..f219287a 100644
--- a/src/net_packet.c
+++ b/src/net_packet.c
@@ -110,7 +110,7 @@ static void udp_probe_h(node_t *n, vpn_packet_t *packet, length_t len) {
 			gettimeofday(&now, NULL);
 			uint32_t sec = htonl(now.tv_sec); memcpy(data, &sec, 4); data += 4;
 			uint32_t usec = htonl(now.tv_usec); memcpy(data, &usec, 4); data += 4;
-			packet->len -= 10;
+			packet->len = 14; // Minimum size for any probe packet.
 		} else {
 			/* Legacy protocol: n won't understand type 2 probe replies. */
 			DATA(packet)[0] = 1;