guacamole-spice-protocol/src/guacd/conf-file.c

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/*
* Copyright (C) 2014 Glyptodon LLC
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "config.h"
#include "conf-file.h"
#include "conf-parse.h"
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#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
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#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
/**
* Updates the configuration with the given parameter/value pair, flagging
* errors as necessary.
*/
static int guacd_conf_callback(const char* section, const char* param, const char* value, void* data) {
guacd_config* config = (guacd_config*) data;
/* Network server options */
if (strcmp(section, "server") == 0) {
/* Bind host */
if (strcmp(param, "bind_host") == 0) {
free(config->bind_host);
config->bind_host = strdup(value);
return 0;
}
/* Bind port */
else if (strcmp(param, "bind_port") == 0) {
free(config->bind_port);
config->bind_port = strdup(value);
return 0;
}
}
/* Options related to daemon startup */
else if (strcmp(section, "daemon") == 0) {
/* PID file */
if (strcmp(param, "pid_file") == 0) {
free(config->pidfile);
config->pidfile = strdup(value);
return 0;
}
}
/* SSL-specific options */
else if (strcmp(section, "ssl") == 0) {
#ifdef ENABLE_SSL
/* SSL certificate */
if (strcmp(param, "server_certificate") == 0) {
free(config->cert_file);
config->cert_file = strdup(value);
return 0;
}
/* SSL key */
else if (strcmp(param, "server_key") == 0) {
free(config->key_file);
config->key_file = strdup(value);
return 0;
}
#else
guacd_conf_parse_error = "SSL support not compiled in";
return 1;
#endif
}
/* If still unhandled, the parameter/section is invalid */
guacd_conf_parse_error = "Invalid parameter or section name";
return 1;
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}
int guacd_conf_parse_file(guacd_config* conf, int fd) {
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int line = 1;
char* line_start = NULL; /* Pointless initialization, but this is not obvious enough for some compilers */
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int parsed = 0;
char buffer[8192];
int chars_read;
int length = 0;
/* Attempt to fill remaining space in buffer */
while ((chars_read = read(fd, buffer + length, sizeof(buffer) - length)) > 0) {
length += chars_read;
line_start = buffer;
/* Attempt to parse entire buffer */
while ((parsed = guacd_parse_conf(guacd_conf_callback, line_start, length, conf)) > 0) {
line_start += parsed;
length -= parsed;
line++;
}
/* Shift contents to front */
memmove(buffer, line_start, length);
}
/* Handle parse errors */
if (parsed < 0) {
int column = guacd_conf_parse_error_location - line_start + 1;
fprintf(stderr, "Parse error at line %i, column %i: %s.\n",
line, column, guacd_conf_parse_error);
return 1;
}
/* Check for error conditions */
if (chars_read < 0) {
fprintf(stderr, "Error reading configuration: %s\n", strerror(errno));
return 1;
}
/* Read successfully */
return 0;
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}
guacd_config* guacd_conf_load() {
guacd_config* conf = malloc(sizeof(guacd_config));
if (conf == NULL)
return NULL;
/* Load defaults */
conf->bind_host = NULL;
conf->bind_port = strdup("4822");
conf->pidfile = NULL;
conf->foreground = 0;
#ifdef ENABLE_SSL
conf->cert_file = NULL;
conf->key_file = NULL;
#endif
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/* Read configuration from file */
int fd = open(GUACD_CONF_FILE, O_RDONLY);
if (fd > 0) {
int retval = guacd_conf_parse_file(conf, fd);
close(fd);
if (retval != 0) {
fprintf(stderr, "Unable to parse \"" GUACD_CONF_FILE "\".\n");
return NULL;
}
}
/* Notify of errors preventing reading */
else if (errno != ENOENT) {
fprintf(stderr, "Unable to open \"" GUACD_CONF_FILE "\": %s\n", strerror(errno));
return NULL;
}
return conf;
}