From bdeccfd9fff5317f86d1023099b9d73880c8684b Mon Sep 17 00:00:00 2001
From: Justin Matlock <antisocialdalek@users.noreply.github.com>
Date: Fri, 6 Mar 2015 02:58:52 -0500
Subject: [PATCH] add longer check for xmpp preamble

original wasn't catching the preamble from Adium or Pidgin XMPP clients, because of a newline after the initial <xml> line. Grew the length of the check string so it'd see the word 'jabber' faster.
---
 probe.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/probe.c b/probe.c
index cf7711f..8cff937 100644
--- a/probe.c
+++ b/probe.c
@@ -169,7 +169,10 @@ static int is_tinc_protocol( const char *p, int len, struct proto *proto)
  * */
 static int is_xmpp_protocol( const char *p, int len, struct proto *proto)
 {
-    if (len < 6)
+    /* sometimes the word 'jabber' shows up late in the initial string,
+       sometimes after a newline. this makes sure we snarf the entire preamble
+       and detect it. (fixed for adium/pidgin) */
+    if (len < 50)
         return PROBE_AGAIN;
 
     return memmem(p, len, "jabber", 6) ? 1 : 0;