2016-02-29 05:31:50 +00:00
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/*
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* Copyright (C) 2014 Glyptodon LLC
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "guac_recording.h"
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#include <guacamole/client.h>
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#include <guacamole/socket.h>
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2016-03-16 00:06:52 +00:00
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#include <sys/stat.h>
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#include <sys/types.h>
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2016-02-29 05:31:50 +00:00
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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2016-03-16 00:06:52 +00:00
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#include <unistd.h>
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2016-02-29 05:31:50 +00:00
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/**
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* Attempts to open a new recording within the given path and having the given
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* name. If such a file already exists, sequential numeric suffixes (.1, .2,
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* .3, etc.) are appended until a filename is found which does not exist (or
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* until the maximum number of numeric suffixes has been tried). If the file
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* absolutely cannot be opened due to an error, -1 is returned and errno is set
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* appropriately.
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*
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* @param path
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* The full path to the directory in which the data file should be created.
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*
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* @param name
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* The name of the data file which should be crated within the given path.
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*
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* @param basename
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* A buffer in which the path, a path separator, the filename, any
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* necessary suffix, and a NULL terminator will be stored. If insufficient
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* space is available, -1 will be returned, and errno will be set to
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* ENAMETOOLONG.
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*
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* @param basename_size
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* The number of bytes available within the provided basename buffer.
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*
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* @return
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* The file descriptor of the open data file if open succeeded, or -1 on
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* failure.
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*/
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static int guac_common_recording_open(const char* path,
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const char* name, char* basename, int basename_size) {
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int i;
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/* Concatenate path and name (separated by a single slash) */
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int basename_length = snprintf(basename,
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basename_size - GUAC_COMMON_RECORDING_MAX_SUFFIX_LENGTH,
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"%s/%s", path, name);
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/* Abort if maximum length reached */
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if (basename_length ==
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basename_size - GUAC_COMMON_RECORDING_MAX_SUFFIX_LENGTH) {
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errno = ENAMETOOLONG;
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return -1;
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}
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/* Attempt to open recording */
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int fd = open(basename,
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O_CREAT | O_EXCL | O_WRONLY,
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S_IRUSR | S_IWUSR);
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/* Continuously retry with alternate names on failure */
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if (fd == -1) {
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/* Prepare basename for additional suffix */
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basename[basename_length] = '.';
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char* suffix = &(basename[basename_length + 1]);
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/* Continue retrying alternative suffixes if file already exists */
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for (i = 1; fd == -1 && errno == EEXIST
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&& i <= GUAC_COMMON_RECORDING_MAX_SUFFIX; i++) {
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/* Append new suffix */
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sprintf(suffix, "%i", i);
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/* Retry with newly-suffixed filename */
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fd = open(basename,
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O_CREAT | O_EXCL | O_WRONLY,
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S_IRUSR | S_IWUSR);
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}
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} /* end if open succeeded */
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2016-03-16 00:06:52 +00:00
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/* Lock entire output file for writing by the current process */
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struct flock file_lock = {
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.l_type = F_WRLCK,
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.l_whence = SEEK_SET,
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.l_start = 0,
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.l_len = 0,
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.l_pid = getpid()
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};
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/* Abort if file cannot be locked for reading */
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if (fcntl(fd, F_SETLK, &file_lock) == -1) {
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close(fd);
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return -1;
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}
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2016-02-29 05:31:50 +00:00
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return fd;
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}
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int guac_common_recording_create(guac_client* client, const char* path,
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const char* name, int create_path) {
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char filename[GUAC_COMMON_RECORDING_MAX_NAME_LENGTH];
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/* Create path if it does not exist, fail if impossible */
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if (create_path && mkdir(path, S_IRWXU) && errno != EEXIST) {
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guac_client_log(client, GUAC_LOG_ERROR,
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"Creation of recording failed: %s", strerror(errno));
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return 1;
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}
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/* Attempt to open recording file */
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int fd = guac_common_recording_open(path, name, filename, sizeof(filename));
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if (fd == -1) {
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guac_client_log(client, GUAC_LOG_ERROR,
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"Creation of recording failed: %s", strerror(errno));
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return 1;
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}
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/* Replace client socket with wrapped socket */
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client->socket = guac_socket_tee(client->socket, guac_socket_open(fd));
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/* Recording creation succeeded */
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guac_client_log(client, GUAC_LOG_INFO,
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"Recording of session will be saved to \"%s\".",
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filename);
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return 0;
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}
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