mike-jumper commented on a change in pull request #219: GUACAMOLE-422: Add
timezone to client handshake
URL: https://github.com/apache/guacamole-server/pull/219#discussion_r278349694
##########
File path: src/libguac/user-handshake.c
##########
@@ -305,104 +310,20 @@ int guac_user_handle_connection(guac_user* user, int
usec_timeout) {
guac_parser* parser = guac_parser_alloc();
- /* Get optimal screen size */
- if (guac_parser_expect(parser, socket, usec_timeout, "size")) {
-
- /* Log error */
+ /* Perform the handshake with the client. */
+ if (__guac_user_handshake(user, parser, usec_timeout)) {
guac_user_log_handshake_failure(user);
guac_user_log_guac_error(user, GUAC_LOG_DEBUG,
- "Error reading \"size\"");
-
+ "Error while reading opcode instruction.");
guac_parser_free(parser);
- return 1;
- }
-
- /* Validate content of size instruction */
- if (parser->argc < 2) {
- guac_user_log(user, GUAC_LOG_ERROR, "Received \"size\" "
- "instruction lacked required arguments.");
- guac_parser_free(parser);
- return 1;
- }
-
- /* Parse optimal screen dimensions from size instruction */
- user->info.optimal_width = atoi(parser->argv[0]);
- user->info.optimal_height = atoi(parser->argv[1]);
-
- /* If DPI given, set the user resolution */
- if (parser->argc >= 3)
- user->info.optimal_resolution = atoi(parser->argv[2]);
-
- /* Otherwise, use a safe default for rough backwards compatibility */
- else
- user->info.optimal_resolution = 96;
-
- /* Get supported audio formats */
- if (guac_parser_expect(parser, socket, usec_timeout, "audio")) {
-
- /* Log error */
- guac_user_log_handshake_failure(user);
- guac_user_log_guac_error(user, GUAC_LOG_DEBUG,
- "Error reading \"audio\"");
-
- guac_parser_free(parser);
- return 1;
- }
-
- /* Store audio mimetypes */
- char** audio_mimetypes = guac_copy_mimetypes(parser->argv, parser->argc);
- user->info.audio_mimetypes = (const char**) audio_mimetypes;
-
- /* Get supported video formats */
- if (guac_parser_expect(parser, socket, usec_timeout, "video")) {
-
- /* Log error */
- guac_user_log_handshake_failure(user);
- guac_user_log_guac_error(user, GUAC_LOG_DEBUG,
- "Error reading \"video\"");
-
- guac_parser_free(parser);
- return 1;
- }
-
- /* Store video mimetypes */
- char** video_mimetypes = guac_copy_mimetypes(parser->argv, parser->argc);
- user->info.video_mimetypes = (const char**) video_mimetypes;
-
- /* Get supported image formats */
- if (guac_parser_expect(parser, socket, usec_timeout, "image")) {
-
- /* Log error */
- guac_user_log_handshake_failure(user);
- guac_user_log_guac_error(user, GUAC_LOG_DEBUG,
- "Error reading \"image\"");
-
- guac_parser_free(parser);
- return 1;
- }
-
- /* Store image mimetypes */
- char** image_mimetypes = guac_copy_mimetypes(parser->argv, parser->argc);
- user->info.image_mimetypes = (const char**) image_mimetypes;
-
- /* Get args from connect instruction */
- if (guac_parser_expect(parser, socket, usec_timeout, "connect")) {
-
- /* Log error */
- guac_user_log_handshake_failure(user);
- guac_user_log_guac_error(user, GUAC_LOG_DEBUG,
- "Error reading \"connect\"");
-
- guac_parser_free(parser);
- return 1;
}
/* Acknowledge connection availability */
guac_protocol_send_ready(socket, client->connection_id);
guac_socket_flush(socket);
-
- /* Attempt join */
- if (guac_client_add_user(client, user, parser->argc, parser->argv))
+
+ /* Attempt to join user to connection. */
+ if (guac_client_add_user(client, user, (parser->argc - 1), parser->argv +
1))
Review comment:
Is `argc` verified anywhere prior to advancing forward by one? I looked
around and didn't see any check prior to this call, but I might be missing
something.
While it is true that the Guacamole protocol requires the client to send
sufficient argument values to match each argument given with `args`, a broken
client may well not.
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