Improve ssh_message_auth* functions.

git-svn-id: svn+ssh://svn.berlios.de/svnroot/repos/libssh/trunk@442 7dcaeef0-15fb-0310-b436-a5af3365683c

include/libssh/server.h

@@ -80,7 +80,7 @@ void ssh_message_free(SSH_MESSAGE *msg);
 char *ssh_message_auth_user(SSH_MESSAGE *msg);
 char *ssh_message_auth_password(SSH_MESSAGE *msg);
 int ssh_message_auth_reply_success(SSH_MESSAGE *msg,int partial);
-void ssh_message_auth_set_methods(SSH_MESSAGE *msg, int methods);
+int ssh_message_auth_set_methods(SSH_MESSAGE *msg, int methods);
 
 CHANNEL *ssh_message_channel_request_open_reply_accept(SSH_MESSAGE *msg);
 

libssh/messages.c

@@ -212,15 +212,29 @@ error:
 }
 
 char *ssh_message_auth_user(SSH_MESSAGE *msg) {
+  if (msg == NULL || msg->auth_request == NULL) {
+    return NULL;
+  }
+
   return msg->auth_request.username;
 }
 
 char *ssh_message_auth_password(SSH_MESSAGE *msg){
+  if (msg == NULL || msg->auth_request == NULL) {
+    return NULL;
+  }
+
   return msg->auth_request.password;
 }
 
-void ssh_message_auth_set_methods(SSH_MESSAGE *msg,int methods){
+int ssh_message_auth_set_methods(SSH_MESSAGE *msg, int methods) {
+  if (msg == NULL || msg->session == NULL) {
+    return -1;
+  }
+
   msg->session->auth_methods = methods;
+
+  return 0;
 }
 
 static int ssh_message_auth_reply_default(SSH_MESSAGE *msg,int partial){