sftp server: Implementation of sftp_server_free() as counterpart to sftp_server_new()

Fixes T143

Signed-off-by: David Wedderwille <davidwe@posteo.de>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>

include/libssh/sftp.h

@@ -853,6 +853,13 @@ LIBSSH_API sftp_session sftp_server_new(ssh_session session, ssh_channel chan);
  * @return             0 on success, < 0 on error.
  */
 LIBSSH_API int sftp_server_init(sftp_session sftp);
+
+/**
+ * @brief Close and deallocate a sftp server session.
+ *
+ * @param sftp          The sftp session handle to free.
+ */
+LIBSSH_API void sftp_server_free(sftp_session sftp);
 #endif  /* WITH_SERVER */
 
 /* this is not a public interface */

src/sftp.c

@@ -298,6 +298,32 @@ int sftp_server_init(sftp_session sftp){
 
   return 0;
 }
+
+void sftp_server_free(sftp_session sftp)
+{
+    sftp_request_queue ptr;
+
+    if (sftp == NULL) {
+        return;
+    }
+
+    ptr = sftp->queue;
+    while(ptr) {
+        sftp_request_queue old;
+        sftp_message_free(ptr->message);
+        old = ptr->next;
+        SAFE_FREE(ptr);
+        ptr = old;
+    }
+
+    SAFE_FREE(sftp->handles);
+    SSH_BUFFER_FREE(sftp->read_packet->payload);
+    SAFE_FREE(sftp->read_packet);
+
+    sftp_ext_free(sftp->ext);
+
+    SAFE_FREE(sftp);
+}
 #endif /* WITH_SERVER */
 
 void sftp_free(sftp_session sftp)