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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;
}
/**
* 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();
}
/**
* 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;
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;
}
atexit(libcharon_deinit);
if (!libcharon_init())
{
sd_notifyf(0, "STATUS=libcharon initialization failed");
return SS_RC_INITIALIZATION_FAILED;
}
if (!lookup_uid_gid())
{
sd_notifyf(0, "STATUS=unknown uid/gid");
return SS_RC_INITIALIZATION_FAILED;
}
/* 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");
return SS_RC_INITIALIZATION_FAILED;
}
lib->plugins->status(lib->plugins, LEVEL_CTRL);
if (!lib->caps->drop(lib->caps))
{
sd_notifyf(0, "STATUS=dropping capabilities failed");
return SS_RC_INITIALIZATION_FAILED;
}
/* add handler for SEGV and ILL,
* INT, TERM and HUP are handled by sigwaitinfo() in run() */
action.sa_handler = segv_handler;
action.sa_flags = 0;
sigemptyset(&action.sa_mask);
sigaddset(&action.sa_mask, SIGINT);
sigaddset(&action.sa_mask, SIGTERM);
sigaddset(&action.sa_mask, SIGHUP);
sigaction(SIGSEGV, &action, NULL);
sigaction(SIGILL, &action, NULL);
sigaction(SIGBUS, &action, NULL);
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);
return run();
}
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