fix segv in unhide_value

diff --git a/Changes b/Changes
index 9c790f7..a1f3126 100644 (file)
--- a/Changes
+++ b/Changes
@@ -8,6 +8,7 @@
 - Clarify usage of shutdown signals in documentation.
 - Always initialise PRNG.
 - Sanity check length of random_vector.
+- Fix segv in unhide_value.
 
 * Sun Jun 5 2005 Brendan O'Dea <bod@optusnet.com.au> 2.1.0
 - Add IPv6 support from Jonathan McDowell.

diff --git a/l2tpns.c b/l2tpns.c
index bd255a3..7ce6e6b 100644 (file)
--- a/l2tpns.c
+++ b/l2tpns.c
@@ -4,7 +4,7 @@
 // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
 // vim: sw=8 ts=8
 
-char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.110 2005/06/14 03:36:23 bodea Exp $";
+char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.111 2005/06/14 04:47:24 bodea Exp $";
 
 #include <arpa/inet.h>
 #include <assert.h>
@@ -2024,8 +2024,6 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
                                                continue;
                                        }
 
-                                       LOG(4, s, t, "Hidden AVP\n");
-
                                        // Unhide the AVP
                                        unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
 
@@ -2046,7 +2044,9 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
                                        n = orig_len;
                                }
 
-                               LOG(4, s, t, "   AVP %d (%s) len %d\n", mtype, avp_name(mtype), n);
+                               LOG(4, s, t, "   AVP %d (%s) len %d%s%s\n", mtype, avp_name(mtype), n,
+                                       flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
+
                                switch (mtype)
                                {
                                case 0:     // message type
@@ -5011,11 +5011,11 @@ static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vec
        uint8_t digest[16];
        uint8_t *last;
        size_t d = 0;
+       uint16_t m = htons(type);
 
        // Compute initial pad
        MD5Init(&ctx);
-       MD5Update(&ctx, (uint8_t) (type >> 8) & 0xff, 1);
-       MD5Update(&ctx, (uint8_t)  type       & 0xff, 1);
+       MD5Update(&ctx, (unsigned char *) &m, 2);
        MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
        MD5Update(&ctx, vector, vec_len);
        MD5Final(digest, &ctx);