Improve ssh_options_allow_ssh2().

git-svn-id: svn+ssh://svn.berlios.de/svnroot/repos/libssh/trunk@367 7dcaeef0-15fb-0310-b436-a5af3365683c

include/libssh/libssh.h

@@ -322,7 +322,7 @@ int ssh_options_set_status_callback(SSH_OPTIONS *opt, void (*callback)
         (void *arg, float status), void *arg);
 int ssh_options_set_timeout(SSH_OPTIONS *opt, long seconds, long usec);
 int ssh_options_allow_ssh1(SSH_OPTIONS *opt, int allow);
-void ssh_options_allow_ssh2(SSH_OPTIONS *opt, int allow);
+int ssh_options_allow_ssh2(SSH_OPTIONS *opt, int allow);
 void ssh_options_set_dsa_server_key(SSH_OPTIONS *opt, const char *dsakey);
 void ssh_options_set_rsa_server_key(SSH_OPTIONS *opt, const char *rsakey);
 void ssh_options_set_log_function(SSH_OPTIONS *opt,

libssh/options.c

@@ -691,18 +691,31 @@ int ssh_options_allow_ssh1(SSH_OPTIONS *opt, int allow) {
   return 0;
 }
 
-/** Default value is 1 (allow connection to SSH2 servers)
- * \brief allow or deny the connection to SSH2 servers
- * \param opt options structure
- * \param allow nonzero values allow ssh2
+/**
+ * @brief Allow or deny the connection to SSH2 servers.
+ *
+ * Default value is 1 (allow connection to SSH2 servers).
+ *
+ * @param opt           The options structure to use.
+ *
+ * @param allow         Non zero values allow ssh2.
+ *
+ * @return 0 on success, < 0 on error.
  */
-void ssh_options_allow_ssh2(SSH_OPTIONS *opt, int allow){
-    if(allow)
+int ssh_options_allow_ssh2(SSH_OPTIONS *opt, int allow) {
+  if (opt == NULL) {
+    return -1;
+  }
+
+  if (allow) {
     opt->ssh2allowed = 1;
-    else
+  } else {
     opt->ssh2allowed = 0;
   }
 
+  return 0;
+}
+
 /** Default is a write on stderr
  * \brief Change the writer callback for logging
  * \param opt options structure