charon-cmd: add a stub for charon-cmd, a simple command line IKE client

1 files changed, 358 insertions, 0 deletions

diff --git a/src/charon-cmd/charon-cmd.c b/src/charon-cmd/charon-cmd.c
new file mode 100644
index 000000000..b2cb6e810
--- /dev/null
+++ b/src/charon-cmd/charon-cmd.c
@@ -0,0 +1,358 @@
+/*
+ * Copyright (C) 2006-2012 Tobias Brunner
+ * Copyright (C) 2005-2013 Martin Willi
+ * Copyright (C) 2006 Daniel Roethlisberger
+ * Copyright (C) 2005 Jan Hutter
+ * Hochschule fuer Technik Rapperswil
+ *
+ * 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 <stdio.h>
+#define _POSIX_PTHREAD_SEMANTICS /* for two param sigwait on OpenSolaris */
+#include <signal.h>
+#undef _POSIX_PTHREAD_SEMANTICS
+#include <pthread.h>
+#include <sys/types.h>
+#include <sys/utsname.h>
+#include <unistd.h>
+#include <getopt.h>
+
+#include <library.h>
+#include <hydra.h>
+#include <daemon.h>
+#include <utils/backtrace.h>
+#include <threading/thread.h>
+
+/**
+ * Loglevel configuration
+ */
+static level_t levels[DBG_MAX];
+
+/**
+ * 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);
+	}
+}
+
+/**
+ * Run the daemon and handle unix signals
+ */
+static void run()
+{
+	sigset_t set;
+
+	/* handle SIGINT, SIGHUP ans SIGTERM in this handler */
+	sigemptyset(&set);
+	sigaddset(&set, SIGINT);
+	sigaddset(&set, SIGHUP);
+	sigaddset(&set, SIGTERM);
+	sigprocmask(SIG_BLOCK, &set, NULL);
+
+	while (TRUE)
+	{
+		int sig;
+		int error;
+
+		error = sigwait(&set, &sig);
+		if (error)
+		{
+			DBG1(DBG_DMN, "error %d while waiting for a signal", error);
+			return;
+		}
+		switch (sig)
+		{
+			case SIGHUP:
+			{
+				DBG1(DBG_DMN, "signal of type SIGHUP received. Reloading "
+					 "configuration");
+				if (lib->settings->load_files(lib->settings, NULL, FALSE))
+				{
+					charon->load_loggers(charon, levels, TRUE);
+					lib->plugins->reload(lib->plugins, NULL);
+				}
+				else
+				{
+					DBG1(DBG_DMN, "reloading config failed, keeping old");
+				}
+				break;
+			}
+			case SIGINT:
+			{
+				DBG1(DBG_DMN, "signal of type SIGINT received. Shutting down");
+				charon->bus->alert(charon->bus, ALERT_SHUTDOWN_SIGNAL, sig);
+				return;
+			}
+			case SIGTERM:
+			{
+				DBG1(DBG_DMN, "signal of type SIGTERM received. Shutting down");
+				charon->bus->alert(charon->bus, ALERT_SHUTDOWN_SIGNAL, sig);
+				return;
+			}
+			default:
+			{
+				DBG1(DBG_DMN, "unknown signal %d received. Ignored", sig);
+				break;
+			}
+		}
+	}
+}
+
+/**
+ * lookup UID and GID
+ */
+static bool lookup_uid_gid()
+{
+#ifdef IPSEC_USER
+	if (!charon->caps->resolve_uid(charon->caps, IPSEC_USER))
+	{
+		return FALSE;
+	}
+#endif
+#ifdef IPSEC_GROUP
+	if (!charon->caps->resolve_gid(charon->caps, IPSEC_GROUP))
+	{
+		return FALSE;
+	}
+#endif
+	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, stderr, TRUE);
+	backtrace->destroy(backtrace);
+
+	DBG1(DBG_DMN, "killing ourself, received critical signal");
+	abort();
+}
+
+/**
+ * Command line arguments, similar to "struct option", but with descriptions
+ */
+static struct {
+	/** long option name */
+	const char *lng;
+	/** short option name */
+	const char shrt;
+	/** takes argument */
+	int has_arg;
+	/** decription of argument */
+	const char *arg;
+	/** description to option */
+	const char *desc;
+} options[] = {
+	{ "help", 'h', no_argument, "",
+	  "print this usage information and exit" },
+	{ "version", 'v', no_argument, "",
+	  "show version information and exit" },
+};
+
+/**
+ * Print command line usage and exit
+ */
+static void usage(FILE *out, char *msg, char *binary)
+{
+	int i, pre, post, padto = 0, spacing = 2;
+
+	for (i = 0; i < countof(options); i++)
+	{
+		padto = max(padto, strlen(options[i].lng) + strlen(options[i].arg));
+	}
+	padto += spacing;
+
+	if (msg)
+	{
+		fprintf(out, "%s\n", msg);
+	}
+	fprintf(out, "Usage: %s\n", binary);
+	for (i = 0; i < countof(options); i++)
+	{
+		switch (options[i].has_arg)
+		{
+			case required_argument:
+				pre = '<';
+				post = '>';
+				break;
+			case optional_argument:
+				pre = '[';
+				post = ']';
+				break;
+			case no_argument:
+			default:
+				pre = post = ' ';
+				break;
+		}
+		fprintf(out, "  --%s (-%-c) %c%s%c %-*s%s\n",
+			options[i].lng, options[i].shrt,
+			pre, options[i].arg, post,
+			padto - strlen(options[i].lng) - strlen(options[i].arg), "",
+			options[i].desc);
+	}
+}
+
+/**
+ * Handle command line options
+ */
+static void handle_arguments(int argc, char *argv[])
+{
+	while (TRUE)
+	{
+		struct option long_opts[countof(options) + 1] = {};
+		char optstring[countof(options) * 3 + 1] = {};
+		int i, pos = 0;
+
+		for (i = 0; i < countof(options); i++)
+		{
+			long_opts[i].name = options[i].lng;
+			long_opts[i].val = options[i].shrt;
+			long_opts[i].has_arg = options[i].has_arg;
+			optstring[pos++] = options[i].shrt;
+			switch (options[i].has_arg)
+			{
+				case optional_argument:
+					optstring[pos++] = ':';
+					/* FALL */
+				case required_argument:
+					optstring[pos++] = ':';
+					/* FALL */
+				case no_argument:
+				default:
+					break;
+			}
+		}
+
+		switch (getopt_long(argc, argv, optstring, long_opts, NULL))
+		{
+			case EOF:
+				break;
+			case 'h':
+				usage(stdout, NULL, argv[0]);
+				exit(0);
+			case 'v':
+				printf("%s, strongSwan %s\n", "charon-cmd", VERSION);
+				exit(0);
+			default:
+				usage(stderr, NULL, argv[0]);
+				exit(1);
+		}
+		break;
+	}
+}
+
+/**
+ * Main function, starts the daemon.
+ */
+int main(int argc, char *argv[])
+{
+	struct sigaction action;
+	struct utsname utsname;
+	int group;
+
+	dbg = dbg_stderr;
+	atexit(library_deinit);
+	if (!library_init(NULL))
+	{
+		exit(SS_RC_LIBSTRONGSWAN_INTEGRITY);
+	}
+	if (lib->integrity)
+	{
+		if (!lib->integrity->check_file(lib->integrity, "charon-cmd", argv[0]))
+		{
+			exit(SS_RC_DAEMON_INTEGRITY);
+		}
+	}
+	atexit(libhydra_deinit);
+	if (!libhydra_init("charon-cmd"))
+	{
+		exit(SS_RC_INITIALIZATION_FAILED);
+	}
+	atexit(libcharon_deinit);
+	if (!libcharon_init("charon-cmd"))
+	{
+		exit(SS_RC_INITIALIZATION_FAILED);
+	}
+	for (group = 0; group < DBG_MAX; group++)
+	{
+		levels[group] = LEVEL_CTRL;
+	}
+
+	handle_arguments(argc, argv);
+
+	if (!lookup_uid_gid())
+	{
+		exit(SS_RC_INITIALIZATION_FAILED);
+	}
+	charon->load_loggers(charon, levels, TRUE);
+
+	if (uname(&utsname) != 0)
+	{
+		memset(&utsname, 0, sizeof(utsname));
+	}
+	DBG1(DBG_DMN, "Starting charon-cmd IKE client (strongSwan %s, %s %s, %s)",
+		 VERSION, utsname.sysname, utsname.release, utsname.machine);
+
+	if (!charon->initialize(charon,
+			lib->settings->get_str(lib->settings, "charon-cmd.load", PLUGINS)))
+	{
+		exit(SS_RC_INITIALIZATION_FAILED);
+	}
+	if (!charon->caps->drop(charon->caps))
+	{
+		exit(SS_RC_INITIALIZATION_FAILED);
+	}
+
+	/* add handler for SEGV and ILL,
+	 * INT, TERM and HUP are handled by sigwait() 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);
+
+	/* start daemon with thread-pool */
+	charon->start(charon);
+	/* wait for signal */
+	run();
+
+	return 0;
+}