524 lines
14 KiB
C
524 lines
14 KiB
C
/**
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* @file daemon.c
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*
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* @brief Implementation of daemon_t and main of IKEv2-Daemon.
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*
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*/
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/*
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* Copyright (C) 2006 Tobias Brunner, Daniel Roethlisberger
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* Copyright (C) 2005-2006 Martin Willi
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* Copyright (C) 2005 Jan Hutter
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include <stdio.h>
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#include <signal.h>
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#include <pthread.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <time.h>
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#include <string.h>
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#include <getopt.h>
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#include <errno.h>
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#ifdef HAVE_BACKTRACE
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# include <execinfo.h>
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#endif /* HAVE_BACKTRACE */
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#include "daemon.h"
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#include <library.h>
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#include <crypto/ca.h>
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#include <utils/fetcher.h>
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#include <config/credentials/local_credential_store.h>
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#include <config/backends/local_backend.h>
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#include <sa/authenticators/eap/eap_method.h>
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typedef struct private_daemon_t private_daemon_t;
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/**
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* Private additions to daemon_t, contains threads and internal functions.
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*/
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struct private_daemon_t {
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/**
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* Public members of daemon_t.
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*/
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daemon_t public;
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/**
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* Signal set used for signal handling.
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*/
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sigset_t signal_set;
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/**
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* The thread_id of main-thread.
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*/
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pthread_t main_thread_id;
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};
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/**
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* One and only instance of the daemon.
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*/
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daemon_t *charon;
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/**
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* hook in library for debugging messages
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*/
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extern void (*dbg) (int level, char *fmt, ...);
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/**
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* Logging hook for library logs, spreads debug message over bus
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*/
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static void dbg_bus(int level, char *fmt, ...)
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{
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va_list args;
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va_start(args, fmt);
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charon->bus->vsignal(charon->bus, DBG_LIB, level, fmt, args);
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va_end(args);
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}
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/**
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* Logging hook for library logs, using stderr output
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*/
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static void dbg_stderr(int level, char *fmt, ...)
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{
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va_list args;
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va_start(args, fmt);
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fprintf(stderr, "00[LIB] ");
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vfprintf(stderr, fmt, args);
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fprintf(stderr, "\n");
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va_end(args);
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}
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/**
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* Run the daemon and handle unix signals
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*/
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static void run(private_daemon_t *this)
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{
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/* reselect signals for this thread */
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sigemptyset(&(this->signal_set));
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sigaddset(&(this->signal_set), SIGINT);
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sigaddset(&(this->signal_set), SIGHUP);
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sigaddset(&(this->signal_set), SIGTERM);
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pthread_sigmask(SIG_BLOCK, &(this->signal_set), 0);
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while(TRUE)
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{
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int signal_number;
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int error;
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error = sigwait(&(this->signal_set), &signal_number);
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if(error)
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{
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DBG1(DBG_DMN, "error %d while waiting for a signal", error);
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return;
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}
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switch (signal_number)
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{
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case SIGHUP:
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{
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DBG1(DBG_DMN, "signal of type SIGHUP received. Ignored");
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break;
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}
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case SIGINT:
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{
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DBG1(DBG_DMN, "signal of type SIGINT received. Shutting down");
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return;
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}
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case SIGTERM:
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DBG1(DBG_DMN, "signal of type SIGTERM received. Shutting down");
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return;
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default:
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{
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DBG1(DBG_DMN, "unknown signal %d received. Ignored", signal_number);
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break;
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}
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}
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}
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}
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/**
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* Clean up all daemon resources
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*/
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static void destroy(private_daemon_t *this)
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{
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/* destruction is a non trivial task, we need to follow
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* a strict order to prevent threading issues!
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* Kill active threads first, except the sender, as
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* the killed IKE_SA want to send delete messages.
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*/
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/* we don't want to receive anything anymore... */
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DESTROY_IF(this->public.receiver);
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/* ignore all incoming user requests */
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DESTROY_IF(this->public.interfaces);
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/* stop scheduing jobs */
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DESTROY_IF(this->public.scheduler);
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/* stop processing jobs */
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DESTROY_IF(this->public.thread_pool);
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/* shut down manager with all IKE SAs */
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DESTROY_IF(this->public.ike_sa_manager);
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/* all child SAs should be down now, so kill kernel interface */
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DESTROY_IF(this->public.kernel_interface);
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/* destroy other infrastructure */
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DESTROY_IF(this->public.job_queue);
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DESTROY_IF(this->public.event_queue);
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DESTROY_IF(this->public.credentials);
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DESTROY_IF(this->public.backends);
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sched_yield();
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/* we hope the sender could send the outstanding deletes, but
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* we shut down here at any cost */
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DESTROY_IF(this->public.sender);
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DESTROY_IF(this->public.socket);
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/* before destroying bus with its listeners, rehook library logs */
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dbg = dbg_stderr;
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DESTROY_IF(this->public.bus);
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DESTROY_IF(this->public.outlog);
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DESTROY_IF(this->public.syslog);
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DESTROY_IF(this->public.authlog);
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free(this);
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}
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/**
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* Enforce daemon shutdown, with a given reason to do so.
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*/
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static void kill_daemon(private_daemon_t *this, char *reason)
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{
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/* we send SIGTERM, so the daemon can cleanly shut down */
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DBG1(DBG_DMN, "killing daemon: %s", reason);
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if (this->main_thread_id == pthread_self())
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{
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/* initialization failed, terminate daemon */
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destroy(this);
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unlink(PID_FILE);
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exit(-1);
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}
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else
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{
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DBG1(DBG_DMN, "sending SIGTERM to ourself");
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raise(SIGTERM);
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/* thread must die, since he produced a ciritcal failure and can't continue */
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pthread_exit(NULL);
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}
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}
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/**
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* Initialize the daemon, optional with a strict crl policy
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*/
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static void initialize(private_daemon_t *this, bool syslog, level_t levels[])
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{
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credential_store_t* credentials;
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signal_t signal;
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/* for uncritical pseudo random numbers */
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srandom(time(NULL) + getpid());
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/* setup bus and it's listeners first to enable log output */
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this->public.bus = bus_create();
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this->public.outlog = file_logger_create(stdout);
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this->public.syslog = sys_logger_create(LOG_DAEMON);
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this->public.authlog = sys_logger_create(LOG_AUTHPRIV);
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this->public.bus->add_listener(this->public.bus, &this->public.syslog->listener);
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this->public.bus->add_listener(this->public.bus, &this->public.outlog->listener);
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this->public.bus->add_listener(this->public.bus, &this->public.authlog->listener);
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this->public.authlog->set_level(this->public.authlog, SIG_ANY, LEVEL_AUDIT);
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/* set up hook to log dbg message in library via charons message bus */
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dbg = dbg_bus;
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/* apply loglevels */
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for (signal = 0; signal < DBG_MAX; signal++)
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{
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if (syslog)
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{
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this->public.syslog->set_level(this->public.syslog,
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signal, levels[signal]);
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}
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else
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{
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this->public.outlog->set_level(this->public.outlog,
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signal, levels[signal]);
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}
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}
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DBG1(DBG_DMN, "starting charon (strongSwan Version %s)", VERSION);
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this->public.socket = socket_create(IKEV2_UDP_PORT, IKEV2_NATT_PORT);
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this->public.ike_sa_manager = ike_sa_manager_create();
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this->public.job_queue = job_queue_create();
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this->public.event_queue = event_queue_create();
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this->public.credentials = (credential_store_t*)local_credential_store_create();
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this->public.backends = backend_manager_create();
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/* initialize fetcher_t class */
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fetcher_initialize();
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/* load secrets, ca certificates and crls */
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credentials = this->public.credentials;
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credentials->load_ca_certificates(credentials);
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credentials->load_aa_certificates(credentials);
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credentials->load_attr_certificates(credentials);
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credentials->load_ocsp_certificates(credentials);
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credentials->load_crls(credentials);
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credentials->load_secrets(credentials);
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/* start building threads, we are multi-threaded NOW */
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this->public.interfaces = interface_manager_create();
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this->public.sender = sender_create();
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this->public.receiver = receiver_create();
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this->public.scheduler = scheduler_create();
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this->public.kernel_interface = kernel_interface_create();
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this->public.thread_pool = thread_pool_create(NUMBER_OF_WORKING_THREADS);
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}
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/**
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* Handle SIGSEGV/SIGILL signals raised by threads
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*/
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void signal_handler(int signal)
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{
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#ifdef HAVE_BACKTRACE
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void *array[20];
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size_t size;
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char **strings;
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size_t i;
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size = backtrace(array, 20);
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strings = backtrace_symbols(array, size);
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DBG1(DBG_DMN, "thread %u received %s. Dumping %d frames from stack:",
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pthread_self(), signal == SIGSEGV ? "SIGSEGV" : "SIGILL", size);
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for (i = 0; i < size; i++)
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{
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DBG1(DBG_DMN, " %s", strings[i]);
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}
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free (strings);
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#else /* !HAVE_BACKTRACE */
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DBG1(DBG_DMN, "thread %u received %s",
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pthread_self(), signal == SIGSEGV ? "SIGSEGV" : "SIGILL");
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#endif /* HAVE_BACKTRACE */
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DBG1(DBG_DMN, "killing ourself hard after SIGSEGV");
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raise(SIGKILL);
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}
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/**
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* Create the daemon.
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*/
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private_daemon_t *daemon_create(void)
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{
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private_daemon_t *this = malloc_thing(private_daemon_t);
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struct sigaction action;
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/* assign methods */
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this->public.kill = (void (*) (daemon_t*,char*))kill_daemon;
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/* NULL members for clean destruction */
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this->public.socket = NULL;
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this->public.ike_sa_manager = NULL;
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this->public.job_queue = NULL;
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this->public.event_queue = NULL;
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this->public.credentials = NULL;
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this->public.backends = NULL;
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this->public.sender= NULL;
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this->public.receiver = NULL;
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this->public.scheduler = NULL;
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this->public.kernel_interface = NULL;
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this->public.thread_pool = NULL;
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this->public.interfaces = NULL;
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this->public.bus = NULL;
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this->public.outlog = NULL;
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this->public.syslog = NULL;
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this->public.authlog = NULL;
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this->main_thread_id = pthread_self();
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/* setup signal handling for all threads */
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sigemptyset(&(this->signal_set));
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sigaddset(&(this->signal_set), SIGSEGV);
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sigaddset(&(this->signal_set), SIGINT);
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sigaddset(&(this->signal_set), SIGHUP);
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sigaddset(&(this->signal_set), SIGTERM);
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pthread_sigmask(SIG_BLOCK, &(this->signal_set), 0);
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/* setup SIGSEGV handler for all threads */
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action.sa_handler = signal_handler;
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action.sa_mask = this->signal_set;
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action.sa_flags = 0;
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sigaction(SIGSEGV, &action, NULL);
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sigaction(SIGILL, &action, NULL);
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return this;
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}
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/**
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* print command line usage and exit
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*/
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static void usage(const char *msg)
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{
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if (msg != NULL && *msg != '\0')
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{
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fprintf(stderr, "%s\n", msg);
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}
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fprintf(stderr, "Usage: charon\n"
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" [--help]\n"
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" [--version]\n"
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" [--strictcrlpolicy]\n"
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" [--cachecrls]\n"
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" [--crlcheckinterval <interval>]\n"
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" [--eapdir <dir>]\n"
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" [--use-syslog]\n"
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" [--debug-<type> <level>]\n"
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" <type>: log context type (dmn|mgr|ike|chd|job|cfg|knl|net|enc|lib)\n"
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" <level>: log verbosity (-1 = silent, 0 = audit, 1 = control,\n"
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" 2 = controlmore, 3 = raw, 4 = private)\n"
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"\n"
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);
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exit(msg == NULL? 0 : 1);
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}
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/**
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* Main function, manages the daemon.
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*/
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int main(int argc, char *argv[])
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{
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u_int crl_check_interval = 0;
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strict_t strict_crl_policy = STRICT_NO;
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bool cache_crls = FALSE;
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bool use_syslog = FALSE;
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char *eapdir = IPSEC_EAPDIR;
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private_daemon_t *private_charon;
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FILE *pid_file;
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struct stat stb;
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linked_list_t *list;
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host_t *host;
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level_t levels[DBG_MAX];
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int signal;
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/* use CTRL loglevel for default */
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for (signal = 0; signal < DBG_MAX; signal++)
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{
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levels[signal] = LEVEL_CTRL;
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}
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/* handle arguments */
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for (;;)
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{
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struct option long_opts[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, 'v' },
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{ "use-syslog", no_argument, NULL, 'l' },
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{ "strictcrlpolicy", required_argument, NULL, 'r' },
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{ "cachecrls", no_argument, NULL, 'C' },
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{ "crlcheckinterval", required_argument, NULL, 'x' },
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{ "eapdir", required_argument, NULL, 'e' },
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/* TODO: handle "debug-all" */
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{ "debug-dmn", required_argument, &signal, DBG_DMN },
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{ "debug-mgr", required_argument, &signal, DBG_MGR },
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{ "debug-ike", required_argument, &signal, DBG_IKE },
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{ "debug-chd", required_argument, &signal, DBG_CHD },
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{ "debug-job", required_argument, &signal, DBG_JOB },
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{ "debug-cfg", required_argument, &signal, DBG_CFG },
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{ "debug-knl", required_argument, &signal, DBG_KNL },
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{ "debug-net", required_argument, &signal, DBG_NET },
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{ "debug-enc", required_argument, &signal, DBG_ENC },
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{ "debug-lib", required_argument, &signal, DBG_LIB },
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{ 0,0,0,0 }
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};
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int c = getopt_long(argc, argv, "", long_opts, NULL);
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switch (c)
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{
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case EOF:
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break;
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case 'h':
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usage(NULL);
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break;
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case 'v':
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printf("Linux strongSwan %s\n", VERSION);
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exit(0);
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case 'l':
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use_syslog = TRUE;
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continue;
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case 'r':
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strict_crl_policy = atoi(optarg);
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continue;
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case 'C':
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cache_crls = TRUE;
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continue;
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case 'x':
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crl_check_interval = atoi(optarg);
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continue;
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case 'e':
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eapdir = optarg;
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continue;
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case 0:
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/* option is in signal */
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levels[signal] = atoi(optarg);
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continue;
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default:
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usage("");
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break;
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}
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break;
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}
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private_charon = daemon_create();
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charon = (daemon_t*)private_charon;
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/* initialize daemon */
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initialize(private_charon, use_syslog, levels);
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/* load pluggable EAP modules */
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eap_method_load(eapdir);
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/* set strict_crl_policy, cache_crls and crl_check_interval options */
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ca_info_set_options(strict_crl_policy, cache_crls, crl_check_interval);
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/* check/setup PID file */
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if (stat(PID_FILE, &stb) == 0)
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{
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DBG1(DBG_DMN, "charon already running (\""PID_FILE"\" exists)");
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destroy(private_charon);
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exit(-1);
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}
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pid_file = fopen(PID_FILE, "w");
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if (pid_file)
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{
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fprintf(pid_file, "%d\n", getpid());
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fclose(pid_file);
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}
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/* log socket info */
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list = charon->kernel_interface->create_address_list(charon->kernel_interface);
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DBG1(DBG_NET, "listening on %d addresses:", list->get_count(list));
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while (list->remove_first(list, (void**)&host) == SUCCESS)
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{
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DBG1(DBG_NET, " %H", host);
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host->destroy(host);
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}
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list->destroy(list);
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/* run daemon */
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run(private_charon);
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eap_method_unload();
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fetcher_finalize();
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/* normal termination, cleanup and exit */
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destroy(private_charon);
|
|
unlink(PID_FILE);
|
|
|
|
return 0;
|
|
}
|