415 lines
8.9 KiB
C
415 lines
8.9 KiB
C
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/*
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* Copyright (C) 2006-2010 Tobias Brunner
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* Copyright (C) 2005-2009 Martin Willi
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* Copyright (C) 2006 Daniel Roethlisberger
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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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#ifdef HAVE_PRCTL
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#include <sys/prctl.h>
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#endif
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#define _POSIX_PTHREAD_SEMANTICS /* for two param sigwait on OpenSolaris */
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#include <signal.h>
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#undef _POSIX_PTHREAD_SEMANTICS
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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 <getopt.h>
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#include <pwd.h>
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#include <grp.h>
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#include <daemon.h>
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#include <library.h>
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#include <utils/backtrace.h>
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#include <threading/thread.h>
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/**
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* PID file, in which charon stores its process id
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*/
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#define PID_FILE IPSEC_PIDDIR "/charon.pid"
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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, 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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if (level <= 1)
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{
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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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/**
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* Run the daemon and handle unix signals
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*/
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static void run()
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{
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sigset_t set;
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/* handle SIGINT, SIGHUP ans SIGTERM in this handler */
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sigemptyset(&set);
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sigaddset(&set, SIGINT);
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sigaddset(&set, SIGHUP);
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sigaddset(&set, SIGTERM);
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sigprocmask(SIG_BLOCK, &set, NULL);
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while (TRUE)
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{
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int sig;
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int error;
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error = sigwait(&set, &sig);
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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 (sig)
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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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charon->bus->alert(charon->bus, ALERT_SHUTDOWN_SIGNAL, sig);
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return;
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}
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case SIGTERM:
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{
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DBG1(DBG_DMN, "signal of type SIGTERM received. Shutting down");
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charon->bus->alert(charon->bus, ALERT_SHUTDOWN_SIGNAL, sig);
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return;
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}
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default:
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{
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DBG1(DBG_DMN, "unknown signal %d received. Ignored", sig);
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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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* drop daemon capabilities
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*/
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static bool drop_capabilities()
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{
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#ifdef HAVE_PRCTL
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prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0);
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#endif
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if (setgid(charon->gid) != 0)
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{
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DBG1(DBG_DMN, "change to unprivileged group failed");
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return FALSE;
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}
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if (setuid(charon->uid) != 0)
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{
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DBG1(DBG_DMN, "change to unprivileged user failed");
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return FALSE;
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}
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if (!charon->drop_capabilities(charon))
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{
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DBG1(DBG_DMN, "unable to drop daemon capabilities");
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return FALSE;
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}
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return TRUE;
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}
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/**
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* lookup UID and GID
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*/
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static bool lookup_uid_gid()
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{
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#ifdef IPSEC_USER
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{
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char buf[1024];
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struct passwd passwd, *pwp;
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if (getpwnam_r(IPSEC_USER, &passwd, buf, sizeof(buf), &pwp) != 0 ||
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pwp == NULL)
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{
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DBG1(DBG_DMN, "resolving user '"IPSEC_USER"' failed");
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return FALSE;
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}
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charon->uid = pwp->pw_uid;
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}
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#endif
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#ifdef IPSEC_GROUP
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{
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char buf[1024];
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struct group group, *grp;
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if (getgrnam_r(IPSEC_GROUP, &group, buf, sizeof(buf), &grp) != 0 ||
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grp == NULL)
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{
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DBG1(DBG_DMN, "resolving group '"IPSEC_GROUP"' failed");
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return FALSE;
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}
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charon->gid = grp->gr_gid;
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}
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#endif
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return TRUE;
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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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static void segv_handler(int signal)
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{
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backtrace_t *backtrace;
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DBG1(DBG_DMN, "thread %u received %d", thread_current_id(), signal);
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backtrace = backtrace_create(2);
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backtrace->log(backtrace, stderr);
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backtrace->destroy(backtrace);
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DBG1(DBG_DMN, "killing ourself, received critical signal");
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abort();
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}
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/**
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* Check/create PID file, return TRUE if already running
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*/
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static bool check_pidfile()
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{
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struct stat stb;
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FILE *file;
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if (stat(PID_FILE, &stb) == 0)
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{
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file = fopen(PID_FILE, "r");
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if (file)
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{
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char buf[64];
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pid_t pid = 0;
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memset(buf, 0, sizeof(buf));
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if (fread(buf, 1, sizeof(buf), file))
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{
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pid = atoi(buf);
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}
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fclose(file);
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if (pid && kill(pid, 0) == 0)
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{ /* such a process is running */
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return TRUE;
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}
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}
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DBG1(DBG_DMN, "removing pidfile '"PID_FILE"', process not running");
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unlink(PID_FILE);
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}
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/* create new pidfile */
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file = fopen(PID_FILE, "w");
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if (file)
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{
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fprintf(file, "%d\n", getpid());
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ignore_result(fchown(fileno(file), charon->uid, charon->gid));
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fclose(file);
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}
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return FALSE;
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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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" [--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, starts the daemon.
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*/
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int main(int argc, char *argv[])
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{
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struct sigaction action;
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bool use_syslog = FALSE;
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level_t levels[DBG_MAX];
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int group;
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/* logging for library during initialization, as we have no bus yet */
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dbg = dbg_stderr;
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/* initialize library */
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if (!library_init(NULL))
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{
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library_deinit();
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exit(SS_RC_LIBSTRONGSWAN_INTEGRITY);
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}
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if (lib->integrity &&
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!lib->integrity->check_file(lib->integrity, "charon", argv[0]))
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{
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dbg_stderr(1, "integrity check of charon failed");
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library_deinit();
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exit(SS_RC_DAEMON_INTEGRITY);
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}
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if (!libcharon_init())
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{
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dbg_stderr(1, "initialization failed - aborting charon");
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libcharon_deinit();
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library_deinit();
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exit(SS_RC_INITIALIZATION_FAILED);
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}
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/* use CTRL loglevel for default */
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for (group = 0; group < DBG_MAX; group++)
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{
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levels[group] = 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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/* TODO: handle "debug-all" */
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{ "debug-dmn", required_argument, &group, DBG_DMN },
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{ "debug-mgr", required_argument, &group, DBG_MGR },
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{ "debug-ike", required_argument, &group, DBG_IKE },
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{ "debug-chd", required_argument, &group, DBG_CHD },
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{ "debug-job", required_argument, &group, DBG_JOB },
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{ "debug-cfg", required_argument, &group, DBG_CFG },
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{ "debug-knl", required_argument, &group, DBG_KNL },
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{ "debug-net", required_argument, &group, DBG_NET },
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{ "debug-enc", required_argument, &group, DBG_ENC },
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{ "debug-lib", required_argument, &group, 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 0:
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/* option is in group */
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levels[group] = 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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if (!lookup_uid_gid())
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{
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dbg_stderr(1, "invalid uid/gid - aborting charon");
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libcharon_deinit();
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library_deinit();
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exit(SS_RC_INITIALIZATION_FAILED);
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}
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/* initialize daemon */
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if (!charon->initialize(charon, use_syslog, levels))
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{
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DBG1(DBG_DMN, "initialization failed - aborting charon");
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libcharon_deinit();
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library_deinit();
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exit(SS_RC_INITIALIZATION_FAILED);
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}
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if (check_pidfile())
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{
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DBG1(DBG_DMN, "charon already running (\""PID_FILE"\" exists)");
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libcharon_deinit();
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library_deinit();
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exit(-1);
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}
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if (!drop_capabilities())
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{
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DBG1(DBG_DMN, "capability dropping failed - aborting charon");
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libcharon_deinit();
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library_deinit();
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exit(SS_RC_INITIALIZATION_FAILED);
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}
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/* add handler for SEGV and ILL,
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* INT, TERM and HUP are handled by sigwait() in run() */
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action.sa_handler = segv_handler;
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action.sa_flags = 0;
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sigemptyset(&action.sa_mask);
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sigaddset(&action.sa_mask, SIGINT);
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sigaddset(&action.sa_mask, SIGTERM);
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sigaddset(&action.sa_mask, SIGHUP);
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sigaction(SIGSEGV, &action, NULL);
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sigaction(SIGILL, &action, NULL);
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sigaction(SIGBUS, &action, NULL);
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action.sa_handler = SIG_IGN;
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sigaction(SIGPIPE, &action, NULL);
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pthread_sigmask(SIG_SETMASK, &action.sa_mask, NULL);
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/* start daemon (i.e. the threads in the thread-pool) */
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charon->start(charon);
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/* main thread goes to run loop */
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run();
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/* normal termination, cleanup and exit */
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libcharon_deinit();
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library_deinit();
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unlink(PID_FILE);
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return 0;
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}
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