Add systemd script
This commit is contained in:
Nick Peng
302
src/smartdns.c
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302
src/smartdns.c
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/*************************************************************************
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*
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* Copyright (C) 2018 Ruilin Peng (Nick) <pymumu@gmail.com>.
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*
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* smartdns is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* smartdns is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "atomic.h"
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#include "conf.h"
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#include "dns_client.h"
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#include "dns_server.h"
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#include "fast_ping.h"
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#include "hashtable.h"
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#include "list.h"
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#include "tlog.h"
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#include "util.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.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 <sys/stat.h>
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#include <sys/types.h>
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#define RESOLVE_FILE "/etc/resolv.conf"
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#define MAX_LINE_LEN 1024
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#define MAX_KEY_LEN 64
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#define SMARTDNS_CONF_FILE "/etc/smartdns/smartdns.conf"
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#define SMARTDNS_LOG_PATH "/var/log"
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#define SMARTDNS_LOG_FILE "smartdns.log"
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#define SMARTDNS_PID_FILE "/var/run/smartdns.pid"
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#define TMP_BUFF_LEN_32 32
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void help(void)
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{
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/* clang-format off */
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char *help = ""
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"Usage: smartdns [OPTION]...\n"
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"Start smartdns server.\n"
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" -f run forground.\n"
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" -c [conf] config file.\n"
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" -h show this help message.\n"
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"\n";
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/* clang-format on */
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printf(help);
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}
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int smartdns_load_from_resolv(void)
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{
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FILE *fp = NULL;
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char line[MAX_LINE_LEN];
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char key[MAX_KEY_LEN];
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char value[MAX_LINE_LEN];
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char ns_ip[DNS_MAX_IPLEN];
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int port = PORT_NOT_DEFINED;
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int ret = -1;
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int filed_num = 0;
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int line_num = 0;
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fp = fopen(RESOLVE_FILE, "r");
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if (fp == NULL) {
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tlog(TLOG_ERROR, "open %s failed, %s", RESOLVE_FILE, strerror(errno));
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return -1;
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}
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while (fgets(line, MAX_LINE_LEN, fp)) {
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line_num++;
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filed_num = sscanf(line, "%63s %1023[^\r\n]s", key, value);
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if (filed_num != 2) {
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continue;
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}
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if (strncmp(key, "nameserver", MAX_KEY_LEN) != 0) {
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continue;
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}
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if (parse_ip(value, ns_ip, &port) != 0) {
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continue;
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}
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if (port == PORT_NOT_DEFINED) {
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port = DEFAULT_DNS_PORT;
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}
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strncpy(dns_conf_servers[dns_conf_server_num].server, ns_ip, DNS_MAX_IPLEN);
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dns_conf_servers[dns_conf_server_num].port = port;
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dns_conf_servers[dns_conf_server_num].type = DNS_SERVER_UDP;
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dns_conf_server_num++;
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ret = 0;
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}
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fclose(fp);
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return ret;
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}
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int smartdns_add_servers(void)
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{
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int i = 0;
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int ret = 0;
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for (i = 0; i < dns_conf_server_num; i++) {
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ret = dns_add_server(dns_conf_servers[i].server, dns_conf_servers[i].port, dns_conf_servers[i].type);
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if (ret != 0) {
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tlog(TLOG_ERROR, "add server failed, %s:%d", dns_conf_servers[i].server, dns_conf_servers[i].port);
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return -1;
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}
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}
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return 0;
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}
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int create_pid_file(const char *pid_file)
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{
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int fd;
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int flags;
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char buff[TMP_BUFF_LEN_32];
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/* create pid file, and lock this file */
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fd = open(pid_file, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
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if (fd == -1) {
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fprintf(stderr, "create pid file failed, %s", strerror(errno));
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return -1;
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}
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flags = fcntl(fd, F_GETFD);
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if (flags < 0) {
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fprintf(stderr, "Could not get flags for PID file %s", pid_file);
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goto errout;
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}
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flags |= FD_CLOEXEC;
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if (fcntl(fd, F_SETFD, flags) == -1) {
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fprintf(stderr, "Could not set flags for PID file %s", pid_file);
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goto errout;
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}
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if (lockf(fd, F_TLOCK, 0) < 0) {
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fprintf(stderr, "Server is already running.\n");
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goto errout;
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}
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snprintf(buff, TMP_BUFF_LEN_32, "%d\n", getpid());
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if (write(fd, buff, strnlen(buff, TMP_BUFF_LEN_32)) < 0) {
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fprintf(stderr, "write pid to file failed, %s.\n", strerror(errno));
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goto errout;
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}
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return 0;
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errout:
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if (fd > 0) {
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close(fd);
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}
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return -1;
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}
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int smartdns_init(void)
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{
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int ret;
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ret = tlog_init(SMARTDNS_LOG_PATH, SMARTDNS_LOG_FILE, 1024 * 1024, 8, 1, 0, 0);
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if (ret != 0) {
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tlog(TLOG_ERROR, "start tlog failed.\n");
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goto errout;
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}
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tlog_setlogscreen(1);
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tlog_setlevel(dns_conf_loglevel);
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if (dns_conf_server_num <= 0) {
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if (smartdns_load_from_resolv() != 0) {
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tlog(TLOG_ERROR, "load dns from resolv failed.");
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goto errout;
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}
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}
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ret = fast_ping_init();
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if (ret != 0) {
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tlog(TLOG_ERROR, "start ping failed.\n");
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goto errout;
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}
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ret = dns_server_init();
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if (ret != 0) {
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tlog(TLOG_ERROR, "start dns server failed.\n");
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goto errout;
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}
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ret = dns_client_init();
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if (ret != 0) {
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tlog(TLOG_ERROR, "start dns client failed.\n");
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goto errout;
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}
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ret = smartdns_add_servers();
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if (ret != 0) {
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tlog(TLOG_ERROR, "add servers failed.");
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goto errout;
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}
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return 0;
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errout:
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return -1;
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}
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int smartdns_run(void)
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{
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return dns_server_run();
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}
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void smartdns_exit(void)
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{
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dns_server_exit();
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dns_client_exit();
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fast_ping_exit();
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tlog_exit();
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}
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void sig_handle(int sig)
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{
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switch (sig) {
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case SIGINT:
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dns_server_stop();
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return;
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break;
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default:
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break;
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}
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tlog(TLOG_ERROR, "process exit.\n");
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_exit(0);
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}
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int main(int argc, char *argv[])
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{
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int ret;
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int is_forground = 0;
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int opt;
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char config_file[MAX_LINE_LEN];
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strncpy(config_file, SMARTDNS_CONF_FILE, MAX_LINE_LEN);
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while ((opt = getopt(argc, argv, "fhc:")) != -1) {
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switch (opt) {
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case 'f':
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is_forground = 1;
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break;
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case 'c':
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snprintf(config_file, sizeof(config_file), optarg);
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break;
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case 'h':
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help();
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return 1;
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}
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}
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if (is_forground == 0) {
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if (daemon(0, 0) < 0) {
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fprintf(stderr, "run daemon process failed, %s\n", strerror(errno));
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return 1;
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}
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}
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signal(SIGABRT, sig_handle);
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if (load_conf(config_file) != 0) {
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}
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if (create_pid_file(SMARTDNS_PID_FILE) != 0) {
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fprintf(stderr, "create pid file failed, %s\n", strerror(errno));
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goto errout;
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}
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ret = smartdns_init();
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if (ret != 0) {
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usleep(100000);
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goto errout;
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}
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signal(SIGINT, sig_handle);
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atexit(smartdns_exit);
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return smartdns_run();
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errout:
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return 1;
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}
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