Replacing the original charon with a small wrapper around libcharon.

2 files changed, 427 insertions, 0 deletions

diff --git a/src/charon/Makefile.am b/src/charon/Makefile.am
new file mode 100644
index 000000000..b3f395402
--- /dev/null
+++ b/src/charon/Makefile.am
@@ -0,0 +1,13 @@
+ipsec_PROGRAMS = charon
+
+charon_SOURCES = \
+charon.c
+
+INCLUDES = -I$(top_srcdir)/src/libstrongswan -I$(top_srcdir)/src/libcharon
+AM_CFLAGS = \
+	-DIPSEC_DIR=\"${ipsecdir}\" \
+	-DIPSEC_PIDDIR=\"${piddir}\"
+charon_LDADD = $(top_builddir)/src/libcharon/libcharon.la -lm $(PTHREAD) $(DLLIB)
+
+#EXTRA_DIST = Android.mk
+
diff --git a/src/charon/charon.c b/src/charon/charon.c
new file mode 100644
index 000000000..811c5042f
--- /dev/null
+++ b/src/charon/charon.c
@@ -0,0 +1,414 @@
+/*
+ * Copyright (C) 2006-2010 Tobias Brunner
+ * Copyright (C) 2005-2009 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>
+#ifdef HAVE_PRCTL
+#include <sys/prctl.h>
+#endif
+#define _POSIX_PTHREAD_SEMANTICS /* for two param sigwait on OpenSolaris */
+#include <signal.h>
+#undef _POSIX_PTHREAD_SEMANTICS
+#include <pthread.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <pwd.h>
+#include <grp.h>
+
+#include <daemon.h>
+
+#include <library.h>
+#include <utils/backtrace.h>
+#include <threading/thread.h>
+
+/**
+ * PID file, in which charon stores its process id
+ */
+#define PID_FILE IPSEC_PIDDIR "/charon.pid"
+
+/**
+ * hook in library for debugging messages
+ */
+extern void (*dbg) (int level, char *fmt, ...);
+
+/**
+ * Logging hook for library logs, using stderr output
+ */
+static void dbg_stderr(int level, char *fmt, ...)
+{
+	va_list args;
+
+	if (level <= 1)
+	{
+		va_start(args, fmt);
+		fprintf(stderr, "00[LIB] ");
+		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. Ignored");
+				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;
+			}
+		}
+	}
+}
+
+/**
+ * drop daemon capabilities
+ */
+static bool drop_capabilities()
+{
+#ifdef HAVE_PRCTL
+	prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0);
+#endif
+
+	if (setgid(charon->gid) != 0)
+	{
+		DBG1(DBG_DMN, "change to unprivileged group failed");
+		return FALSE;
+	}
+	if (setuid(charon->uid) != 0)
+	{
+		DBG1(DBG_DMN, "change to unprivileged user failed");
+		return FALSE;
+	}
+	if (!charon->drop_capabilities(charon))
+	{
+		DBG1(DBG_DMN, "unable to drop daemon capabilities");
+		return FALSE;
+	}
+	return TRUE;
+}
+
+/**
+ * lookup UID and GID
+ */
+static bool lookup_uid_gid()
+{
+#ifdef IPSEC_USER
+	{
+		char buf[1024];
+		struct passwd passwd, *pwp;
+
+		if (getpwnam_r(IPSEC_USER, &passwd, buf, sizeof(buf), &pwp) != 0 ||
+			pwp == NULL)
+		{
+			DBG1(DBG_DMN, "resolving user '"IPSEC_USER"' failed");
+			return FALSE;
+		}
+		charon->uid = pwp->pw_uid;
+	}
+#endif
+#ifdef IPSEC_GROUP
+	{
+		char buf[1024];
+		struct group group, *grp;
+
+		if (getgrnam_r(IPSEC_GROUP, &group, buf, sizeof(buf), &grp) != 0 ||
+			grp == NULL)
+		{
+			DBG1(DBG_DMN, "resolving group '"IPSEC_GROUP"' failed");
+			return FALSE;
+		}
+		charon->gid = grp->gr_gid;
+	}
+#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);
+	backtrace->destroy(backtrace);
+
+	DBG1(DBG_DMN, "killing ourself, received critical signal");
+	abort();
+}
+
+/**
+ * Check/create PID file, return TRUE if already running
+ */
+static bool check_pidfile()
+{
+	struct stat stb;
+	FILE *file;
+
+	if (stat(PID_FILE, &stb) == 0)
+	{
+		file = fopen(PID_FILE, "r");
+		if (file)
+		{
+			char buf[64];
+			pid_t pid = 0;
+
+			memset(buf, 0, sizeof(buf));
+			if (fread(buf, 1, sizeof(buf), file))
+			{
+				pid = atoi(buf);
+			}
+			fclose(file);
+			if (pid && kill(pid, 0) == 0)
+			{	/* such a process is running */
+				return TRUE;
+			}
+		}
+		DBG1(DBG_DMN, "removing pidfile '"PID_FILE"', process not running");
+		unlink(PID_FILE);
+	}
+
+	/* create new pidfile */
+	file = fopen(PID_FILE, "w");
+	if (file)
+	{
+		fprintf(file, "%d\n", getpid());
+		ignore_result(fchown(fileno(file), charon->uid, charon->gid));
+		fclose(file);
+	}
+	return FALSE;
+}
+
+/**
+ * print command line usage and exit
+ */
+static void usage(const char *msg)
+{
+	if (msg != NULL && *msg != '\0')
+	{
+		fprintf(stderr, "%s\n", msg);
+	}
+	fprintf(stderr, "Usage: charon\n"
+					"         [--help]\n"
+					"         [--version]\n"
+					"         [--use-syslog]\n"
+					"         [--debug-<type> <level>]\n"
+					"           <type>:  log context type (dmn|mgr|ike|chd|job|cfg|knl|net|enc|lib)\n"
+					"           <level>: log verbosity (-1 = silent, 0 = audit, 1 = control,\n"
+					"                                    2 = controlmore, 3 = raw, 4 = private)\n"
+					"\n"
+		   );
+	exit(msg == NULL? 0 : 1);
+}
+
+/**
+ * Main function, starts the daemon.
+ */
+int main(int argc, char *argv[])
+{
+	struct sigaction action;
+	bool use_syslog = FALSE;
+	level_t levels[DBG_MAX];
+	int group;
+
+	/* logging for library during initialization, as we have no bus yet */
+	dbg = dbg_stderr;
+
+	/* initialize library */
+	if (!library_init(NULL))
+	{
+		library_deinit();
+		exit(SS_RC_LIBSTRONGSWAN_INTEGRITY);
+	}
+
+	if (lib->integrity &&
+		!lib->integrity->check_file(lib->integrity, "charon", argv[0]))
+	{
+		dbg_stderr(1, "integrity check of charon failed");
+		library_deinit();
+		exit(SS_RC_DAEMON_INTEGRITY);
+	}
+
+	if (!libcharon_init())
+	{
+		dbg_stderr(1, "initialization failed - aborting charon");
+		libcharon_deinit();
+		library_deinit();
+		exit(SS_RC_INITIALIZATION_FAILED);
+	}
+
+	/* use CTRL loglevel for default */
+	for (group = 0; group < DBG_MAX; group++)
+	{
+		levels[group] = LEVEL_CTRL;
+	}
+
+	/* handle arguments */
+	for (;;)
+	{
+		struct option long_opts[] = {
+			{ "help", no_argument, NULL, 'h' },
+			{ "version", no_argument, NULL, 'v' },
+			{ "use-syslog", no_argument, NULL, 'l' },
+			/* TODO: handle "debug-all" */
+			{ "debug-dmn", required_argument, &group, DBG_DMN },
+			{ "debug-mgr", required_argument, &group, DBG_MGR },
+			{ "debug-ike", required_argument, &group, DBG_IKE },
+			{ "debug-chd", required_argument, &group, DBG_CHD },
+			{ "debug-job", required_argument, &group, DBG_JOB },
+			{ "debug-cfg", required_argument, &group, DBG_CFG },
+			{ "debug-knl", required_argument, &group, DBG_KNL },
+			{ "debug-net", required_argument, &group, DBG_NET },
+			{ "debug-enc", required_argument, &group, DBG_ENC },
+			{ "debug-lib", required_argument, &group, DBG_LIB },
+			{ 0,0,0,0 }
+		};
+
+		int c = getopt_long(argc, argv, "", long_opts, NULL);
+		switch (c)
+		{
+			case EOF:
+				break;
+			case 'h':
+				usage(NULL);
+				break;
+			case 'v':
+				printf("Linux strongSwan %s\n", VERSION);
+				exit(0);
+			case 'l':
+				use_syslog = TRUE;
+				continue;
+			case 0:
+				/* option is in group */
+				levels[group] = atoi(optarg);
+				continue;
+			default:
+				usage("");
+				break;
+		}
+		break;
+	}
+
+	if (!lookup_uid_gid())
+	{
+		dbg_stderr(1, "invalid uid/gid - aborting charon");
+		libcharon_deinit();
+		library_deinit();
+		exit(SS_RC_INITIALIZATION_FAILED);
+	}
+
+	/* initialize daemon */
+	if (!charon->initialize(charon, use_syslog, levels))
+	{
+		DBG1(DBG_DMN, "initialization failed - aborting charon");
+		libcharon_deinit();
+		library_deinit();
+		exit(SS_RC_INITIALIZATION_FAILED);
+	}
+
+	if (check_pidfile())
+	{
+		DBG1(DBG_DMN, "charon already running (\""PID_FILE"\" exists)");
+		libcharon_deinit();
+		library_deinit();
+		exit(-1);
+	}
+
+	if (!drop_capabilities())
+	{
+		DBG1(DBG_DMN, "capability dropping failed - aborting charon");
+		libcharon_deinit();
+		library_deinit();
+		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 (i.e. the threads in the thread-pool) */
+	charon->start(charon);
+
+	/* main thread goes to run loop */
+	run();
+
+	/* normal termination, cleanup and exit */
+	libcharon_deinit();
+	library_deinit();
+
+	unlink(PID_FILE);
+
+	return 0;
+}
+