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- /*
- * Copyright (C) 2006-2018 Tobias Brunner
- * Copyright (C) 2005-2014 Martin Willi
- * Copyright (C) 2006 Daniel Roethlisberger
- * Copyright (C) 2005 Jan Hutter
- * HSR Hochschule fuer Technik Rapperswil
- * Copyright (C) 2014 revosec AG
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
- *
- * 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 General Public License
- * for more details.
- */
- #include <signal.h>
- #include <stdio.h>
- #include <pthread.h>
- #include <sys/stat.h>
- #include <sys/types.h>
- #include <sys/utsname.h>
- #include <unistd.h>
- #include <errno.h>
- /* won't make sense from our logging hook */
- #define SD_JOURNAL_SUPPRESS_LOCATION
- #include <systemd/sd-daemon.h>
- #include <systemd/sd-journal.h>
- #include <daemon.h>
- #include <library.h>
- #include <utils/backtrace.h>
- #include <threading/thread.h>
- #include <threading/rwlock.h>
- /**
- * Default user and group
- */
- #ifndef IPSEC_USER
- #define IPSEC_USER NULL
- #endif
- #ifndef IPSEC_GROUP
- #define IPSEC_GROUP NULL
- #endif
- /**
- * hook in library for debugging messages
- */
- extern void (*dbg) (debug_t group, level_t level, char *fmt, ...);
- /**
- * Logging hook for library logs, using stderr output
- */
- static void dbg_stderr(debug_t group, level_t level, char *fmt, ...)
- {
- va_list args;
- if (level <= 1)
- {
- va_start(args, fmt);
- fprintf(stderr, "00[%N] ", debug_names, group);
- vfprintf(stderr, fmt, args);
- fprintf(stderr, "\n");
- va_end(args);
- }
- }
- typedef struct journal_logger_t journal_logger_t;
- /**
- * Logger implementation using systemd-journal
- */
- struct journal_logger_t {
- /**
- * Public interface
- */
- custom_logger_t public;
- /**
- * Configured loglevels
- */
- level_t levels[DBG_MAX];
- /**
- * Lock for levels
- */
- rwlock_t *lock;
- };
- METHOD(logger_t, vlog, void,
- journal_logger_t *this, debug_t group, level_t level, int thread,
- ike_sa_t *ike_sa, const char *fmt, va_list args)
- {
- char buf[4096], *msg = buf;
- ssize_t len;
- va_list copy;
- va_copy(copy, args);
- len = vsnprintf(msg, sizeof(buf), fmt, copy);
- va_end(copy);
- if (len >= sizeof(buf))
- {
- len++;
- msg = malloc(len);
- va_copy(copy, args);
- len = vsnprintf(msg, len, fmt, copy);
- va_end(copy);
- }
- if (len > 0)
- {
- char unique[64] = "", name[256] = "";
- int priority;
- if (ike_sa)
- {
- snprintf(unique, sizeof(unique), "IKE_SA_UNIQUE_ID=%u",
- ike_sa->get_unique_id(ike_sa));
- if (ike_sa->get_peer_cfg(ike_sa))
- {
- snprintf(name, sizeof(name), "IKE_SA_NAME=%s",
- ike_sa->get_name(ike_sa));
- }
- }
- switch (level)
- {
- case LEVEL_AUDIT:
- priority = LOG_NOTICE;
- break;
- case LEVEL_CTRL:
- priority = LOG_INFO;
- break;
- default:
- priority = LOG_DEBUG;
- break;
- }
- sd_journal_send(
- "MESSAGE=%s", msg,
- "MESSAGE_ID=57d2708c-d607-43bd-8c39-66bf%.8x",
- chunk_hash_static(chunk_from_str((char*)fmt)),
- "PRIORITY=%d", priority,
- "GROUP=%N", debug_names, group,
- "LEVEL=%d", level,
- "THREAD=%d", thread,
- unique[0] ? unique : NULL,
- name[0] ? name : NULL,
- NULL);
- }
- if (msg != buf)
- {
- free(msg);
- }
- }
- METHOD(logger_t, get_level, level_t,
- journal_logger_t *this, debug_t group)
- {
- level_t level;
- this->lock->read_lock(this->lock);
- level = this->levels[group];
- this->lock->unlock(this->lock);
- return level;
- }
- METHOD(custom_logger_t, set_level, void,
- journal_logger_t *this, debug_t group, level_t level)
- {
- this->lock->write_lock(this->lock);
- this->levels[group] = level;
- this->lock->unlock(this->lock);
- }
- METHOD(custom_logger_t, logger_destroy, void,
- journal_logger_t *this)
- {
- this->lock->destroy(this->lock);
- free(this);
- }
- static custom_logger_t *journal_logger_create(const char *name)
- {
- journal_logger_t *this;
- INIT(this,
- .public = {
- .logger = {
- .vlog = _vlog,
- .get_level = _get_level,
- },
- .set_level = _set_level,
- .destroy = _logger_destroy,
- },
- .lock = rwlock_create(RWLOCK_TYPE_DEFAULT),
- );
- return &this->public;
- }
- /**
- * Run the daemon and handle unix signals
- */
- static int run()
- {
- sigset_t set;
- sigemptyset(&set);
- sigaddset(&set, SIGHUP);
- sigaddset(&set, SIGTERM);
- sigprocmask(SIG_BLOCK, &set, NULL);
- sd_notify(0, "READY=1\n");
- while (TRUE)
- {
- int sig;
- sig = sigwaitinfo(&set, NULL);
- if (sig == -1)
- {
- if (errno == EINTR)
- { /* ignore signals we didn't wait for */
- continue;
- }
- DBG1(DBG_DMN, "waiting for signal failed: %s", strerror(errno));
- return SS_RC_INITIALIZATION_FAILED;
- }
- switch (sig)
- {
- case SIGHUP:
- {
- DBG1(DBG_DMN, "signal of type SIGHUP received. Reloading "
- "configuration");
- if (lib->settings->load_files(lib->settings, lib->conf, FALSE))
- {
- charon->load_loggers(charon);
- lib->plugins->reload(lib->plugins, NULL);
- }
- else
- {
- DBG1(DBG_DMN, "reloading config failed, keeping old");
- }
- break;
- }
- case SIGTERM:
- {
- DBG1(DBG_DMN, "SIGTERM received, shutting down");
- charon->bus->alert(charon->bus, ALERT_SHUTDOWN_SIGNAL, sig);
- return 0;
- }
- }
- }
- }
- /**
- * lookup UID and GID
- */
- static bool lookup_uid_gid()
- {
- char *name;
- name = lib->settings->get_str(lib->settings, "%s.user", IPSEC_USER,
- lib->ns);
- if (name && !lib->caps->resolve_uid(lib->caps, name))
- {
- return FALSE;
- }
- name = lib->settings->get_str(lib->settings, "%s.group", IPSEC_GROUP,
- lib->ns);
- if (name && !lib->caps->resolve_gid(lib->caps, name))
- {
- return FALSE;
- }
- return TRUE;
- }
- #ifndef DISABLE_SIGNAL_HANDLER
- /**
- * Handle SIGSEGV/SIGILL signals raised by threads
- */
- static void segv_handler(int signal)
- {
- backtrace_t *backtrace;
- DBG1(DBG_DMN, "thread %u received %d", thread_current_id(), signal);
- backtrace = backtrace_create(2);
- backtrace->log(backtrace, NULL, TRUE);
- backtrace->log(backtrace, stderr, TRUE);
- backtrace->destroy(backtrace);
- DBG1(DBG_DMN, "killing ourself, received critical signal");
- abort();
- }
- #endif /* DISABLE_SIGNAL_HANDLER */
- /**
- * Add namespace alias
- */
- static void __attribute__ ((constructor))register_namespace()
- {
- /* inherit settings from charon */
- library_add_namespace("charon");
- }
- /**
- * Register journal logger
- */
- static void __attribute__ ((constructor))register_logger()
- {
- register_custom_logger("journal", journal_logger_create);
- }
- /**
- * Main function, starts the daemon.
- */
- int main(int argc, char *argv[])
- {
- struct sigaction action;
- struct utsname utsname;
- int status = SS_RC_INITIALIZATION_FAILED;
- dbg = dbg_stderr;
- if (uname(&utsname) != 0)
- {
- memset(&utsname, 0, sizeof(utsname));
- }
- sd_notifyf(0, "STATUS=Starting charon-systemd, strongSwan %s, %s %s, %s",
- VERSION, utsname.sysname, utsname.release, utsname.machine);
- atexit(library_deinit);
- if (!library_init(NULL, "charon-systemd"))
- {
- sd_notifyf(0, "STATUS=libstrongswan initialization failed");
- return SS_RC_INITIALIZATION_FAILED;
- }
- if (lib->integrity &&
- !lib->integrity->check_file(lib->integrity, "charon-systemd", argv[0]))
- {
- sd_notifyf(0, "STATUS=integrity check of charon-systemd failed");
- return SS_RC_INITIALIZATION_FAILED;
- }
- if (!libcharon_init())
- {
- sd_notifyf(0, "STATUS=libcharon initialization failed");
- goto error;
- }
- if (!lookup_uid_gid())
- {
- sd_notifyf(0, "STATUS=unknown uid/gid");
- goto error;
- }
- /* we registered the journal logger as custom logger, which gets its
- * settings from <ns>.customlog.journal, let it fallback to <ns>.journal */
- lib->settings->add_fallback(lib->settings, "%s.customlog.journal",
- "%s.journal", lib->ns);
- /* load the journal logger by default */
- lib->settings->set_default_str(lib->settings, "%s.journal.default", "1",
- lib->ns);
- charon->load_loggers(charon);
- if (!charon->initialize(charon,
- lib->settings->get_str(lib->settings, "%s.load", PLUGINS, lib->ns)))
- {
- sd_notifyf(0, "STATUS=charon initialization failed");
- goto error;
- }
- lib->plugins->status(lib->plugins, LEVEL_CTRL);
- if (!lib->caps->drop(lib->caps))
- {
- sd_notifyf(0, "STATUS=dropping capabilities failed");
- goto error;
- }
- /* add handler for fatal signals,
- * INT, TERM and HUP are handled by sigwaitinfo() in run() */
- action.sa_flags = 0;
- sigemptyset(&action.sa_mask);
- sigaddset(&action.sa_mask, SIGINT);
- sigaddset(&action.sa_mask, SIGTERM);
- sigaddset(&action.sa_mask, SIGHUP);
- /* optionally let the external system handle fatal signals */
- #ifndef DISABLE_SIGNAL_HANDLER
- action.sa_handler = segv_handler;
- sigaction(SIGSEGV, &action, NULL);
- sigaction(SIGILL, &action, NULL);
- sigaction(SIGBUS, &action, NULL);
- #endif /* DISABLE_SIGNAL_HANDLER */
- action.sa_handler = SIG_IGN;
- sigaction(SIGPIPE, &action, NULL);
- pthread_sigmask(SIG_SETMASK, &action.sa_mask, NULL);
- charon->start(charon);
- sd_notifyf(0, "STATUS=charon-systemd running, strongSwan %s, %s %s, %s",
- VERSION, utsname.sysname, utsname.release, utsname.machine);
- status = run();
- error:
- libcharon_deinit();
- return status;
- }
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