129 lines
3.7 KiB
C
129 lines
3.7 KiB
C
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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#include "config.h"
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#include "argv.h"
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#include "ssh.h"
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#include "terminal/terminal.h"
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#include <guacamole/protocol.h>
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#include <guacamole/socket.h>
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#include <guacamole/user.h>
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#include <stdlib.h>
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#include <string.h>
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/**
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* The value or current status of a connection parameter received over an
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* "argv" stream.
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*/
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typedef struct guac_ssh_argv {
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/**
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* Buffer space for containing the received argument value.
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*/
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char buffer[GUAC_SSH_ARGV_MAX_LENGTH];
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/**
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* The number of bytes received so far.
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*/
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int length;
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} guac_ssh_argv;
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/**
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* Handler for "blob" instructions which appends the data from received blobs
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* to the end of the in-progress argument value buffer.
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*
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* @see guac_user_blob_handler
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*/
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static int guac_ssh_argv_blob_handler(guac_user* user,
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guac_stream* stream, void* data, int length) {
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guac_ssh_argv* argv = (guac_ssh_argv*) stream->data;
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/* Calculate buffer size remaining, including space for null terminator,
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* adjusting received length accordingly */
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int remaining = sizeof(argv->buffer) - argv->length - 1;
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if (length > remaining)
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length = remaining;
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/* Append received data to end of buffer */
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memcpy(argv->buffer + argv->length, data, length);
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argv->length += length;
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return 0;
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}
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/**
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* Handler for "end" instructions which applies the changes specified by the
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* argument value buffer associated with the stream.
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*
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* @see guac_user_end_handler
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*/
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static int guac_ssh_argv_end_handler(guac_user* user,
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guac_stream* stream) {
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guac_client* client = user->client;
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guac_ssh_client* telnet_client = (guac_ssh_client*) client->data;
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guac_terminal* terminal = telnet_client->term;
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/* Append null terminator to value */
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guac_ssh_argv* argv = (guac_ssh_argv*) stream->data;
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argv->buffer[argv->length] = '\0';
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/* Update color scheme */
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guac_terminal_apply_color_scheme(terminal, argv->buffer);
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free(argv);
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return 0;
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}
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int guac_ssh_argv_handler(guac_user* user, guac_stream* stream,
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char* mimetype, char* name) {
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/* Allow users to update the color scheme */
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if (strcmp(name, "color-scheme") == 0) {
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guac_ssh_argv* argv = malloc(sizeof(guac_ssh_argv));
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argv->length = 0;
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/* Prepare stream to receive argument value */
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stream->blob_handler = guac_ssh_argv_blob_handler;
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stream->end_handler = guac_ssh_argv_end_handler;
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stream->data = argv;
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/* Signal stream is ready */
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guac_protocol_send_ack(user->socket, stream, "Ready for color "
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"scheme.", GUAC_PROTOCOL_STATUS_SUCCESS);
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guac_socket_flush(user->socket);
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return 0;
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}
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/* No other connection parameters may be updated */
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guac_protocol_send_ack(user->socket, stream, "Not allowed.",
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GUAC_PROTOCOL_STATUS_CLIENT_FORBIDDEN);
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guac_socket_flush(user->socket);
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return 0;
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}
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