charon-cmd: add a stub for charon-cmd, a simple command line IKE client
This commit is contained in:
Martin Willi
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/*
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* Copyright (C) 2006-2012 Tobias Brunner
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* Copyright (C) 2005-2013 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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#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/types.h>
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#include <sys/utsname.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <library.h>
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#include <hydra.h>
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#include <daemon.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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* Loglevel configuration
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*/
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static level_t levels[DBG_MAX];
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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) (debug_t group, level_t 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(debug_t group, level_t 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[%N] ", debug_names, group);
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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. Reloading "
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"configuration");
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if (lib->settings->load_files(lib->settings, NULL, FALSE))
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{
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charon->load_loggers(charon, levels, TRUE);
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lib->plugins->reload(lib->plugins, NULL);
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}
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else
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{
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DBG1(DBG_DMN, "reloading config failed, keeping old");
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}
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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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* 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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if (!charon->caps->resolve_uid(charon->caps, IPSEC_USER))
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{
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return FALSE;
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}
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#endif
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#ifdef IPSEC_GROUP
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if (!charon->caps->resolve_gid(charon->caps, IPSEC_GROUP))
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{
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return FALSE;
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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, TRUE);
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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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* Command line arguments, similar to "struct option", but with descriptions
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*/
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static struct {
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/** long option name */
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const char *lng;
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/** short option name */
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const char shrt;
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/** takes argument */
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int has_arg;
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/** decription of argument */
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const char *arg;
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/** description to option */
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const char *desc;
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} options[] = {
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{ "help", 'h', no_argument, "",
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"print this usage information and exit" },
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{ "version", 'v', no_argument, "",
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"show version information and exit" },
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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(FILE *out, char *msg, char *binary)
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{
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int i, pre, post, padto = 0, spacing = 2;
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for (i = 0; i < countof(options); i++)
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{
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padto = max(padto, strlen(options[i].lng) + strlen(options[i].arg));
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}
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padto += spacing;
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if (msg)
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{
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fprintf(out, "%s\n", msg);
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}
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fprintf(out, "Usage: %s\n", binary);
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for (i = 0; i < countof(options); i++)
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{
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switch (options[i].has_arg)
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{
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case required_argument:
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pre = '<';
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post = '>';
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break;
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case optional_argument:
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pre = '[';
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post = ']';
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break;
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case no_argument:
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default:
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pre = post = ' ';
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break;
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}
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fprintf(out, " --%s (-%-c) %c%s%c %-*s%s\n",
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options[i].lng, options[i].shrt,
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pre, options[i].arg, post,
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padto - strlen(options[i].lng) - strlen(options[i].arg), "",
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options[i].desc);
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}
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}
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/**
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* Handle command line options
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*/
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static void handle_arguments(int argc, char *argv[])
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{
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while (TRUE)
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{
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struct option long_opts[countof(options) + 1] = {};
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char optstring[countof(options) * 3 + 1] = {};
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int i, pos = 0;
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for (i = 0; i < countof(options); i++)
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{
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long_opts[i].name = options[i].lng;
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long_opts[i].val = options[i].shrt;
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long_opts[i].has_arg = options[i].has_arg;
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optstring[pos++] = options[i].shrt;
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switch (options[i].has_arg)
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{
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case optional_argument:
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optstring[pos++] = ':';
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/* FALL */
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case required_argument:
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optstring[pos++] = ':';
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/* FALL */
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case no_argument:
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default:
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break;
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}
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}
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switch (getopt_long(argc, argv, optstring, long_opts, NULL))
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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(stdout, NULL, argv[0]);
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exit(0);
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case 'v':
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printf("%s, strongSwan %s\n", "charon-cmd", VERSION);
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exit(0);
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default:
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usage(stderr, NULL, argv[0]);
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exit(1);
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}
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break;
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}
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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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struct utsname utsname;
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int group;
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dbg = dbg_stderr;
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atexit(library_deinit);
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if (!library_init(NULL))
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{
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exit(SS_RC_LIBSTRONGSWAN_INTEGRITY);
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}
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if (lib->integrity)
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{
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if (!lib->integrity->check_file(lib->integrity, "charon-cmd", argv[0]))
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{
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exit(SS_RC_DAEMON_INTEGRITY);
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}
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}
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atexit(libhydra_deinit);
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if (!libhydra_init("charon-cmd"))
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{
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exit(SS_RC_INITIALIZATION_FAILED);
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}
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atexit(libcharon_deinit);
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if (!libcharon_init("charon-cmd"))
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{
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exit(SS_RC_INITIALIZATION_FAILED);
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}
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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(argc, argv);
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if (!lookup_uid_gid())
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{
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exit(SS_RC_INITIALIZATION_FAILED);
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}
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charon->load_loggers(charon, levels, TRUE);
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if (uname(&utsname) != 0)
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{
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memset(&utsname, 0, sizeof(utsname));
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}
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DBG1(DBG_DMN, "Starting charon-cmd IKE client (strongSwan %s, %s %s, %s)",
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VERSION, utsname.sysname, utsname.release, utsname.machine);
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if (!charon->initialize(charon,
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lib->settings->get_str(lib->settings, "charon-cmd.load", PLUGINS)))
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{
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exit(SS_RC_INITIALIZATION_FAILED);
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}
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if (!charon->caps->drop(charon->caps))
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{
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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 with thread-pool */
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charon->start(charon);
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/* wait for signal */
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run();
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return 0;
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}
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