From 174de2c0d7c678252af2b9522f8e2073ab4d7ac3 Mon Sep 17 00:00:00 2001
From: bodea <bodea>
Date: Sat, 3 Jun 2006 08:16:46 +0000
Subject: [PATCH] kludge around problem with Netgear DM602 authentication

---
 Changes |  1 +
 ppp.c   | 20 ++++++++++++++------
 2 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/Changes b/Changes
index 0029cfd..7927769 100644
--- a/Changes
+++ b/Changes
@@ -4,6 +4,7 @@
 - Add Multilink support from Khaled Al Hamwi.
 - Remove non-working setuid option.
 - Convert manual.html to Docbook.
+- Kludge around problem with Netgear DM602 authentication.
 
 * Tue Apr 18 2006 Brendan O'Dea <bod@optus.net> 2.1.18
 - Don't shutdown on TerminateReq, wait for CDN.
diff --git a/ppp.c b/ppp.c
index afacd90..fd89d91 100644
--- a/ppp.c
+++ b/ppp.c
@@ -1,6 +1,6 @@
 // L2TPNS PPP Stuff
 
-char const *cvs_id_ppp = "$Id: ppp.c,v 1.100 2006/04/27 09:53:50 bodea Exp $";
+char const *cvs_id_ppp = "$Id: ppp.c,v 1.101 2006/06/03 08:16:46 bodea Exp $";
 
 #include <stdio.h>
 #include <string.h>
@@ -179,16 +179,24 @@ void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
 		return;
 	}
 
-	r = sess_local[s].radius;
-	if (!r)
+	if (session[s].ppp.phase != Authenticate)
 	{
-		LOG(3, s, t, "Unexpected CHAP message\n");
+	    	LOG(2, s, t, "CHAP ignored in %s phase\n", ppp_phase(session[s].ppp.phase));
 		return;
 	}
 
-	if (session[s].ppp.phase != Authenticate)
+	r = sess_local[s].radius;
+	if (!r)
 	{
-	    	LOG(2, s, t, "CHAP ignored in %s phase\n", ppp_phase(session[s].ppp.phase));
+		LOG(3, s, t, "Unexpected CHAP message\n");
+
+		// Some modems (Netgear DM602, possibly others) persist in using CHAP even
+		// after ACKing our ConfigReq for PAP.
+		if (sess_local[s].lcp_authtype == AUTHPAP && config->radius_authtypes & AUTHCHAP)
+		{
+			sess_local[s].lcp_authtype = AUTHCHAP;
+			sendchap(s, t);
+		}
 		return;
 	}
 
-- 
2.20.1