Implemented version string checking to client and server.

[silc.git] / apps / silcd / protocol.c

diff --git a/apps/silcd/protocol.c b/apps/silcd/protocol.c
index 685b5ab654250a9c5ff10b64d9db5566c23710dd..fbe1f566d0a15b8a24baea01817dfb488cc05e92 100644 (file)
--- a/apps/silcd/protocol.c
+++ b/apps/silcd/protocol.c
@@ -115,12 +115,26 @@ static void silc_server_protocol_ke_set_keys(SilcSKE ske,
   sock->user_data = (void *)conn_data;
 }
 
-/* XXX TODO */
+/* Check remote host version string */
 
 SilcSKEStatus silc_ske_check_version(SilcSKE ske, unsigned char *version,
                                     unsigned int len)
 {
-  return SILC_SKE_STATUS_OK;
+  SilcSKEStatus status = SILC_SKE_STATUS_OK;
+
+  /* Check for initial version string */
+  if (!strstr(version, "SILC-1.0-"))
+    status = SILC_SKE_STATUS_BAD_VERSION;
+
+  /* Check software version */
+
+  if (len < strlen(silc_version_string))
+    status = SILC_SKE_STATUS_BAD_VERSION;
+
+  /* XXX for now there is no other tests due to the abnormal version
+     string that is used */
+
+  return status;
 }
 
 /* Performs key exchange protocol. This is used for both initiator