Add error checks to setter.

git-svn-id: svn+ssh://svn.berlios.de/svnroot/repos/libssh/trunk@473 7dcaeef0-15fb-0310-b436-a5af3365683c

libssh/session.c

@@ -142,10 +142,15 @@ void ssh_cleanup(SSH_SESSION *session) {
  */
 void ssh_silent_disconnect(SSH_SESSION *session) {
   enter_function();
+
+  if (session == NULL) {
+    return;
+  }
+
   ssh_socket_close(session->socket);
   session->alive = 0;
   ssh_disconnect(session);
-    //leave_function();
+  /* FIXME: leave_function(); ??? */
 }
 
 /** \brief set the options for the current session
@@ -155,6 +160,10 @@ void ssh_silent_disconnect(SSH_SESSION *session){
  * \see ssh_options_new()
  */
 void ssh_set_options(SSH_SESSION *session, SSH_OPTIONS *options) {
+  if (session == NULL || options == NULL) {
+    return;
+  }
+
   session->options = options;
   session->log_verbosity = options->log_verbosity;
 }
@@ -165,6 +174,10 @@ void ssh_set_options(SSH_SESSION *session, SSH_OPTIONS *options){
  * \bug nonblocking code is in development and won't work as expected
  */
 void ssh_set_blocking(SSH_SESSION *session, int blocking) {
+  if (session == NULL) {
+    return;
+  }
+
   session->blocking = blocking ? 1 : 0;
 }
 
@@ -175,8 +188,11 @@ void ssh_set_blocking(SSH_SESSION *session,int blocking){
  * \return file descriptor of the connection, or -1 if it is
  * not connected
  */
-
 socket_t ssh_get_fd(SSH_SESSION *session) {
+  if (session == NULL) {
+    return -1;
+  }
+
   return ssh_socket_get_fd(session->socket);
 }
 
@@ -184,6 +200,10 @@ socket_t ssh_get_fd(SSH_SESSION *session){
  * \param session ssh session
  */
 void ssh_set_fd_toread(SSH_SESSION *session) {
+  if (session == NULL) {
+    return;
+  }
+
   ssh_socket_set_toread(session->socket);
 }
 
@@ -191,14 +211,21 @@ void ssh_set_fd_toread(SSH_SESSION *session){
  * \param session ssh session
  */
 void ssh_set_fd_towrite(SSH_SESSION *session) {
-    ssh_socket_set_towrite(session->socket);
+  if (session == NULL) {
+    return;
+  }
 
+  ssh_socket_set_towrite(session->socket);
 }
 
 /** \brief say the session it has an exception to catch on the file descriptor
  * \param session ssh session
  */
 void ssh_set_fd_except(SSH_SESSION *session) {
+  if (session == NULL) {
+    return;
+  }
+
   ssh_socket_set_except(session->socket);
 }