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/*
* Usurpation – server daemon settings handling
*
* Copyright (C) 2019 Gediminas Jakutis
* Copyright (C) 2019 Ramūnas Mažeikis
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; version 2.1
* of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include "settings.h"
#include "settings_private.h"
/* TODO: should be, in this order: looking at options provided via command
* line arguments, looking at at /etc/conf.d/usurpation.conf or
* using default. Right now just uses defaults.
*/
void settings_init(void)
{
unset_flag(flag_daemonize);
settings.port = 6996;
settings.verboselevel = USURP_VERBOSITY;
setting_readconf("./usurpation.conf");
}
int setting_detach(void)
{
return test_flag(flag_daemonize);
}
int setting_verbose(void)
{
return settings.verboselevel;
}
unsigned short int setting_port(void)
{
return settings.port;
}
/* could be a one-liner, but let's make the logic more obvious */
int test_flag(unsigned int flag)
{
int ret;
ret = settings.flags & flag;
ret = !!ret;
return ret;
}
void set_flag(unsigned int flag)
{
settings.flags |= flag;
}
void unset_flag(unsigned int flag)
{
settings.flags &= ~flag;
}
/* TODO: semi-stub! */
static int setting_readconf(const char * const path)
{
struct stat filestat;
char *buf;
char *line;
char *entry;
char *value;
char *line_state;
char *token_state;
int fd;
if ((fd = open(path, O_RDONLY | O_NOATIME)) == -1) {
if (USURP_VERBOSITY >= 2) {
perror("error while opening the configuration file");
return 1;
}
}
fstat(fd, &filestat);
buf = malloc(filestat.st_size);
if (read(fd, buf, filestat.st_size) != filestat.st_size) {
if (USURP_VERBOSITY >= 2) {
perror("partial read of configuration file detected");
free(buf);
return 1;
}
}
line = strtok_r(buf, "\n", &line_state);
while (line) {
if (line[0] != '#') {
entry = strtok_r(line, "=", &token_state);
value = strtok_r(NULL, "=", &token_state);
setting_handle_config_entry(entry, value);
}
line = strtok_r(NULL, "\n", &line_state);
}
free(buf);
return 0;
}
static int setting_handle_config_entry(const char * const entry, const char * const value)
{
size_t i;
for (i = 0; i < sizeof(ent_table)/sizeof(*ent_table); ++i) {
if (!(strcmp(entry, ent_table[i].name))) {
ent_table[i].set(value);
return 0;
}
}
return 1;
}
static void set_daemonize(const void * const arg)
{
const char * const a = arg;
atoi(a) ? set_flag(flag_daemonize) : unset_flag(flag_daemonize);
}
static void set_port(const void * const arg)
{
const char * const a = arg;
settings.port = strtoul(a, NULL, 0);
}
static void set_verbosity(const void * const arg)
{
const char * const a = arg;
settings.verboselevel = strtol(a, NULL, 0);
}
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