506 lines
9.1 KiB
C
506 lines
9.1 KiB
C
/*
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* uhub - A tiny ADC p2p connection hub
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* Copyright (C) 2007-2014, Jan Vidar Krey
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*
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* This program 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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* This program 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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*/
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#include "uhub.h"
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#ifdef SYSTEMD
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#include <systemd/sd-daemon.h>
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#endif
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static int arg_verbose = 5;
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static int arg_fork = 0;
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static int arg_check_config = 0;
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static int arg_dump_config = 0;
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static int arg_have_config = 0;
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static const char* arg_uid = 0;
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static const char* arg_gid = 0;
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static const char* arg_config = 0;
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static const char* arg_log = 0;
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static const char* arg_pid = 0;
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static int arg_log_syslog = 0;
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#if !defined(WIN32)
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extern struct hub_info* g_hub;
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void hub_handle_signal(int sig)
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{
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struct hub_info* hub = g_hub;
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switch (sig)
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{
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case SIGINT:
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LOG_INFO("Interrupted. Shutting down...");
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hub->status = hub_status_shutdown;
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break;
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case SIGTERM:
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LOG_INFO("Terminated. Shutting down...");
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hub->status = hub_status_shutdown;
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break;
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case SIGPIPE:
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break;
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case SIGHUP:
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hub->status = hub_status_restart;
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break;
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default:
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LOG_TRACE("hub_handle_signal(): caught unknown signal: %d", signal);
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hub->status = hub_status_shutdown;
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break;
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}
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}
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static int signals[] =
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{
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SIGINT, /* Interrupt the application */
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SIGTERM, /* Terminate the application */
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SIGPIPE, /* prevent sigpipe from kills the application */
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SIGHUP, /* reload configuration */
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0
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};
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void setup_signal_handlers(struct hub_info* hub)
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{
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sigset_t sig_set;
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struct sigaction act;
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int i;
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sigemptyset(&sig_set);
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act.sa_mask = sig_set;
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act.sa_flags = SA_ONSTACK | SA_RESTART;
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act.sa_handler = hub_handle_signal;
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for (i = 0; signals[i]; i++)
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{
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if (sigaction(signals[i], &act, 0) != 0)
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{
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LOG_ERROR("Error setting signal handler %d", signals[i]);
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}
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}
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}
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void shutdown_signal_handlers(struct hub_info* hub)
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{
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}
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#endif /* !WIN32 */
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int main_loop()
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{
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struct hub_config configuration;
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struct acl_handle acl;
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struct hub_info* hub = 0;
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if (net_initialize() == -1)
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return -1;
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do
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{
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if (hub)
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{
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LOG_INFO("Reloading configuration files...");
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LOG_DEBUG("Hub status: %d", (int) hub->status);
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/* Reinitialize logs */
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hub_log_shutdown();
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hub_log_initialize(arg_log, arg_log_syslog);
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hub_set_log_verbosity(arg_verbose);
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}
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if (read_config(arg_config, &configuration, !arg_have_config) == -1)
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return -1;
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if (acl_initialize(&configuration, &acl) == -1)
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return -1;
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/*
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* Don't restart networking when re-reading configuration.
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* This might not be possible either, since we might have
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* dropped our privileges to do so.
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*/
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if (!hub)
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{
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hub = hub_start_service(&configuration);
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if (!hub)
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{
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acl_shutdown(&acl);
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free_config(&configuration);
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net_destroy();
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hub_log_shutdown();
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return -1;
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}
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#if !defined(WIN32)
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setup_signal_handlers(hub);
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#ifdef SYSTEMD
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/* Notify the service manager that this daemon has
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* been successfully initialized and shall enter the
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* main loop.
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*/
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sd_notifyf(0, "READY=1\n"
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"MAINPID=%lu", (unsigned long) getpid());
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#endif /* SYSTEMD */
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#endif /* ! WIN32 */
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}
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hub_set_variables(hub, &acl);
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hub_event_loop(hub);
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hub_free_variables(hub);
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acl_shutdown(&acl);
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free_config(&configuration);
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} while (hub->status == hub_status_restart);
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#if !defined(WIN32)
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shutdown_signal_handlers(hub);
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#endif
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if (hub)
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{
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hub_shutdown_service(hub);
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}
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net_destroy();
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hub_log_shutdown();
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return 0;
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}
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int check_configuration(int dump)
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{
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struct hub_config configuration;
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int ret = read_config(arg_config, &configuration, 0);
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if (dump)
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{
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if (ret != -1)
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{
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dump_config(&configuration, dump > 1);
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}
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return 0;
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}
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if (ret == -1)
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{
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fprintf(stderr, "ERROR\n");
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return 1;
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}
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fprintf(stdout, "OK\n");
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return 0;
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}
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void print_version()
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{
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fprintf(stdout, PRODUCT_STRING "\n");
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fprintf(stdout, COPYRIGHT "\n"
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"This is free software with ABSOLUTELY NO WARRANTY.\n\n");
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exit(0);
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}
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void print_usage(char* program)
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{
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fprintf(stderr, "Usage: %s [options]\n\n", program);
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fprintf(stderr,
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"Options:\n"
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" -v Verbose mode. Add more -v's for higher verbosity.\n"
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" -q Quiet mode - no output\n"
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" -f Fork to background\n"
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" -l <file> Log messages to given file (default: stderr)\n"
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" -c <file> Specify configuration file (default: " SERVER_CONFIG ")\n"
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" -C Check configuration and return\n"
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" -s Show configuration parameters\n"
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" -S Show configuration parameters, but ignore defaults\n"
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" -h This message\n"
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#ifndef WIN32
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#ifdef SYSTEMD
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" -L Log messages to journal\n"
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#else
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" -L Log messages to syslog\n"
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#endif
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" -u <user> Run as given user\n"
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" -g <group> Run with given group permissions\n"
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" -p <file> Store pid in file (process id)\n"
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#endif
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" -V Show version number.\n"
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);
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exit(0);
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}
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void parse_command_line(int argc, char** argv)
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{
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int opt;
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while ((opt = getopt(argc, argv, "vqfc:l:hu:g:VCsSLp:")) != -1)
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{
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switch (opt)
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{
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case 'V':
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print_version();
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break;
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case 'v':
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arg_verbose++;
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break;
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case 'q':
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arg_verbose -= 99;
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break;
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case 'f':
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arg_fork = 1;
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break;
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case 'c':
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arg_config = optarg;
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arg_have_config = 1;
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break;
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case 'C':
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arg_check_config = 1;
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arg_have_config = 1;
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break;
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case 's':
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arg_dump_config = 1;
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arg_check_config = 1;
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break;
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case 'S':
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arg_dump_config = 2;
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arg_check_config = 1;
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break;
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case 'l':
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arg_log = optarg;
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break;
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case 'L':
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arg_log_syslog = 1;
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break;
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case 'h':
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print_usage(argv[0]);
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break;
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case 'u':
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arg_uid = optarg;
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break;
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case 'g':
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arg_gid = optarg;
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break;
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case 'p':
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arg_pid = optarg;
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break;
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default:
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print_usage(argv[0]);
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break;
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}
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}
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if (arg_config == NULL)
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{
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arg_config = SERVER_CONFIG;
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}
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hub_log_initialize(arg_log, arg_log_syslog);
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hub_set_log_verbosity(arg_verbose);
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}
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#ifndef WIN32
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int drop_privileges()
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{
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struct group* perm_group = 0;
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struct passwd* perm_user = 0;
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gid_t perm_gid = 0;
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uid_t perm_uid = 0;
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int gid_ok = 0;
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int ret = 0;
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if (arg_gid)
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{
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ret = 0;
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while ((perm_group = getgrent()) != NULL)
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{
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if (strcmp(perm_group->gr_name, arg_gid) == 0)
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{
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perm_gid = perm_group->gr_gid;
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ret = 1;
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break;
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}
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}
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endgrent();
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if (!ret)
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{
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LOG_FATAL("Unable to determine group id, check group name.");
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return -1;
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}
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LOG_TRACE("Setting group id %d (%s)", (int) perm_gid, arg_gid);
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ret = setgid(perm_gid);
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if (ret == -1)
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{
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LOG_FATAL("Unable to change group id, permission denied.");
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return -1;
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}
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gid_ok = 1;
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}
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if (arg_uid)
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{
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ret = 0;
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while ((perm_user = getpwent()) != NULL)
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{
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if (strcmp(perm_user->pw_name, arg_uid) == 0)
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{
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perm_uid = perm_user->pw_uid;
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if (!gid_ok)
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perm_gid = perm_user->pw_gid;
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ret = 1;
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break;
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}
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}
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endpwent();
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if (!ret)
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{
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LOG_FATAL("Unable to determine user id, check user name.");
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return -1;
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}
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if (!gid_ok) {
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LOG_TRACE("Setting group id %d (%s)", (int) perm_gid, arg_gid);
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ret = setgid(perm_gid);
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if (ret == -1)
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{
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LOG_FATAL("Unable to change group id, permission denied.");
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return -1;
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}
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}
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LOG_TRACE("Setting user id %d (%s)", (int) perm_uid, arg_uid);
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ret = setuid(perm_uid);
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if (ret == -1)
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{
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LOG_FATAL("Unable to change user id, permission denied.");
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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 pidfile_create()
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{
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if (arg_pid)
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{
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FILE* pidfile = fopen(arg_pid, "w");
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if (!pidfile)
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{
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LOG_FATAL("Unable to write pid file: %s\n", arg_pid);
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return -1;
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}
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fprintf(pidfile, "%d", (int) getpid());
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fclose(pidfile);
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}
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return 0;
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}
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int pidfile_destroy()
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{
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if (arg_pid)
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{
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return unlink(arg_pid);
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}
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return 0;
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}
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#endif /* WIN32 */
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int main(int argc, char** argv)
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{
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int ret = 0;
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parse_command_line(argc, argv);
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if (arg_check_config)
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{
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return check_configuration(arg_dump_config);
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}
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#ifndef WIN32
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if (arg_fork)
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{
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ret = fork();
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if (ret == -1)
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{
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LOG_FATAL("Unable to fork to background!");
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return -1;
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}
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else if (ret == 0)
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{
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/* child process - detach from TTY */
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fclose(stdin);
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fclose(stdout);
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fclose(stderr);
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close(0);
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close(1);
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close(2);
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}
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else
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{
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/* parent process */
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LOG_DEBUG("Forked to background\n");
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return 0;
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}
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}
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if (pidfile_create() == -1)
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return -1;
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if (drop_privileges() == -1)
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return -1;
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#endif /* WIN32 */
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ret = main_loop();
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#ifndef WIN32
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pidfile_destroy();
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#endif
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return ret;
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}
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