366 lines
9.1 KiB
C
366 lines
9.1 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 "guacamole/error.h"
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#include "guacamole/protocol.h"
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#include "guacamole/socket.h"
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#include "guacamole/timestamp.h"
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#include <inttypes.h>
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#include <pthread.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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char __guac_socket_BASE64_CHARACTERS[64] = {
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
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'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',
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'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',
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't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7',
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'8', '9', '+', '/'
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};
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static void* __guac_socket_keep_alive_thread(void* data) {
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/* Calculate sleep interval */
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struct timespec interval;
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interval.tv_sec = GUAC_SOCKET_KEEP_ALIVE_INTERVAL / 1000;
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interval.tv_nsec = (GUAC_SOCKET_KEEP_ALIVE_INTERVAL % 1000) * 1000000L;
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/* Socket keep-alive loop */
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guac_socket* socket = (guac_socket*) data;
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while (socket->state == GUAC_SOCKET_OPEN) {
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/* Send NOP keep-alive if it's been a while since the last output */
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guac_timestamp timestamp = guac_timestamp_current();
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if (timestamp - socket->last_write_timestamp >
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GUAC_SOCKET_KEEP_ALIVE_INTERVAL) {
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/* Send NOP */
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if (guac_protocol_send_nop(socket)
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|| guac_socket_flush(socket))
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break;
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}
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/* Sleep until next keep-alive check */
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nanosleep(&interval, NULL);
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}
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return NULL;
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}
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static ssize_t __guac_socket_write(guac_socket* socket,
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const void* buf, size_t count) {
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/* Update timestamp of last write */
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socket->last_write_timestamp = guac_timestamp_current();
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/* If handler defined, call it. */
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if (socket->write_handler)
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return socket->write_handler(socket, buf, count);
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/* Otherwise, pretend everything was written. */
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return count;
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}
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ssize_t guac_socket_write(guac_socket* socket,
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const void* buf, size_t count) {
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const char* buffer = buf;
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/* Write until completely written */
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while (count > 0) {
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/* Attempt to write, return on error */
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int written = __guac_socket_write(socket, buffer, count);
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if (written == -1)
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return 1;
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/* Advance buffer as data written */
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buffer += written;
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count -= written;
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}
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return 0;
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}
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ssize_t guac_socket_read(guac_socket* socket, void* buf, size_t count) {
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/* If handler defined, call it. */
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if (socket->read_handler)
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return socket->read_handler(socket, buf, count);
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/* Otherwise, pretend nothing was read. */
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return 0;
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}
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int guac_socket_select(guac_socket* socket, int usec_timeout) {
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/* Call select handler if defined */
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if (socket->select_handler)
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return socket->select_handler(socket, usec_timeout);
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/* Otherwise, assume ready. */
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return 1;
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}
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guac_socket* guac_socket_alloc() {
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guac_socket* socket = malloc(sizeof(guac_socket));
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/* If no memory available, return with error */
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if (socket == NULL) {
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guac_error = GUAC_STATUS_NO_MEMORY;
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guac_error_message = "Could not allocate memory for socket";
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return NULL;
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}
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socket->__ready = 0;
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socket->data = NULL;
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socket->state = GUAC_SOCKET_OPEN;
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socket->last_write_timestamp = guac_timestamp_current();
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/* No keep alive ping by default */
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socket->__keep_alive_enabled = 0;
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/* No handlers yet */
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socket->read_handler = NULL;
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socket->write_handler = NULL;
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socket->select_handler = NULL;
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socket->free_handler = NULL;
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socket->flush_handler = NULL;
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socket->lock_handler = NULL;
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socket->unlock_handler = NULL;
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return socket;
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}
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void guac_socket_require_keep_alive(guac_socket* socket) {
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/* Start keep-alive thread */
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socket->__keep_alive_enabled = 1;
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pthread_create(&(socket->__keep_alive_thread), NULL,
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__guac_socket_keep_alive_thread, (void*) socket);
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}
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void guac_socket_instruction_begin(guac_socket* socket) {
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/* Call instruction begin handler if defined */
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if (socket->lock_handler)
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socket->lock_handler(socket);
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}
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void guac_socket_instruction_end(guac_socket* socket) {
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/* Call instruction end handler if defined */
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if (socket->unlock_handler)
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socket->unlock_handler(socket);
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}
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void guac_socket_free(guac_socket* socket) {
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guac_socket_flush(socket);
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/* Call free handler if defined */
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if (socket->free_handler)
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socket->free_handler(socket);
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/* Mark as closed */
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socket->state = GUAC_SOCKET_CLOSED;
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/* Wait for keep-alive, if enabled */
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if (socket->__keep_alive_enabled)
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pthread_join(socket->__keep_alive_thread, NULL);
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free(socket);
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}
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ssize_t guac_socket_write_int(guac_socket* socket, int64_t i) {
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char buffer[128];
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int length;
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/* Write provided integer as a string */
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length = snprintf(buffer, sizeof(buffer), "%"PRIi64, i);
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return guac_socket_write(socket, buffer, length);
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}
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ssize_t guac_socket_write_string(guac_socket* socket, const char* str) {
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/* Write contents of string */
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if (guac_socket_write(socket, str, strlen(str)))
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return 1;
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return 0;
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}
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ssize_t __guac_socket_write_base64_triplet(guac_socket* socket,
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int a, int b, int c) {
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char output[4];
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/* Byte 0:[AAAAAA] AABBBB BBBBCC CCCCCC */
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output[0] = __guac_socket_BASE64_CHARACTERS[(a & 0xFC) >> 2];
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if (b >= 0) {
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/* Byte 1: AAAAAA [AABBBB] BBBBCC CCCCCC */
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output[1] = __guac_socket_BASE64_CHARACTERS[((a & 0x03) << 4) | ((b & 0xF0) >> 4)];
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/*
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* Bytes 2 and 3, zero characters of padding:
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*
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* AAAAAA AABBBB [BBBBCC] CCCCCC
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* AAAAAA AABBBB BBBBCC [CCCCCC]
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*/
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if (c >= 0) {
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output[2] = __guac_socket_BASE64_CHARACTERS[((b & 0x0F) << 2) | ((c & 0xC0) >> 6)];
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output[3] = __guac_socket_BASE64_CHARACTERS[c & 0x3F];
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}
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/*
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* Bytes 2 and 3, one character of padding:
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*
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* AAAAAA AABBBB [BBBB--] ------
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* AAAAAA AABBBB BBBB-- [------]
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*/
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else {
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output[2] = __guac_socket_BASE64_CHARACTERS[((b & 0x0F) << 2)];
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output[3] = '=';
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}
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}
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/*
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* Bytes 1, 2, and 3, two characters of padding:
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*
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* AAAAAA [AA----] ------ ------
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* AAAAAA AA---- [------] ------
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* AAAAAA AA---- ------ [------]
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*/
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else {
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output[1] = __guac_socket_BASE64_CHARACTERS[((a & 0x03) << 4)];
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output[2] = '=';
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output[3] = '=';
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}
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/* At this point, 4 base64 bytes have been written */
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if (guac_socket_write(socket, output, 4))
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return -1;
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/* If no second byte was provided, only one byte was written */
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if (b < 0)
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return 1;
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/* If no third byte was provided, only two bytes were written */
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if (c < 0)
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return 2;
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/* Otherwise, three bytes were written */
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return 3;
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}
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ssize_t __guac_socket_write_base64_byte(guac_socket* socket, int buf) {
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int* __ready_buf = socket->__ready_buf;
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int retval;
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__ready_buf[socket->__ready++] = buf;
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/* Flush triplet */
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if (socket->__ready == 3) {
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retval = __guac_socket_write_base64_triplet(socket, __ready_buf[0], __ready_buf[1], __ready_buf[2]);
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if (retval < 0)
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return retval;
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socket->__ready = 0;
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}
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return 1;
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}
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ssize_t guac_socket_write_base64(guac_socket* socket, const void* buf, size_t count) {
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int retval;
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const unsigned char* char_buf = (const unsigned char*) buf;
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const unsigned char* end = char_buf + count;
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while (char_buf < end) {
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retval = __guac_socket_write_base64_byte(socket, *(char_buf++));
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if (retval < 0)
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return retval;
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}
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return 0;
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}
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ssize_t guac_socket_flush(guac_socket* socket) {
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/* If handler defined, call it. */
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if (socket->flush_handler)
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return socket->flush_handler(socket);
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/* Otherwise, do nothing */
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return 0;
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}
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ssize_t guac_socket_flush_base64(guac_socket* socket) {
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int retval;
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/* Flush triplet to output buffer */
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while (socket->__ready > 0) {
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retval = __guac_socket_write_base64_byte(socket, -1);
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if (retval < 0)
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return retval;
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}
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return 0;
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}
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