systemd: Provide a charon-systemd daemon targeting full systemd integration

4 files changed, 242 insertions, 0 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index 95c68d0c8..603c9d164 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -60,6 +60,10 @@ if USE_CHARON
   SUBDIRS += charon
 endif
 
+if USE_SYSTEMD
+  SUBDIRS += charon-systemd
+endif
+
 if USE_NM
   SUBDIRS += charon-nm
 endif
diff --git a/src/charon-systemd/.gitignore b/src/charon-systemd/.gitignore
new file mode 100644
index 000000000..da7b648a5
--- /dev/null
+++ b/src/charon-systemd/.gitignore
@@ -0,0 +1 @@
+charon-systemd
diff --git a/src/charon-systemd/Makefile.am b/src/charon-systemd/Makefile.am
new file mode 100644
index 000000000..677ea3aff
--- /dev/null
+++ b/src/charon-systemd/Makefile.am
@@ -0,0 +1,18 @@
+sbin_PROGRAMS = charon-systemd
+
+charon_systemd_SOURCES = \
+charon-systemd.c
+
+charon-systemd.o :	$(top_builddir)/config.status
+
+charon_systemd_CPPFLAGS = \
+	-I$(top_srcdir)/src/libstrongswan \
+	-I$(top_srcdir)/src/libhydra \
+	-I$(top_srcdir)/src/libcharon \
+	-DPLUGINS=\""${charon_plugins}\""
+
+charon_systemd_LDADD = \
+	$(top_builddir)/src/libstrongswan/libstrongswan.la \
+	$(top_builddir)/src/libhydra/libhydra.la \
+	$(top_builddir)/src/libcharon/libcharon.la \
+	-lsystemd-daemon -lm $(PTHREADLIB) $(DLLIB)
diff --git a/src/charon-systemd/charon-systemd.c b/src/charon-systemd/charon-systemd.c
new file mode 100644
index 000000000..de9d9b59c
--- /dev/null
+++ b/src/charon-systemd/charon-systemd.c
@@ -0,0 +1,219 @@
+/*
+ * Copyright (C) 2006-2012 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 <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>
+#include <systemd/sd-daemon.h>
+
+#include <hydra.h>
+#include <daemon.h>
+
+#include <library.h>
+#include <utils/backtrace.h>
+#include <threading/thread.h>
+
+/**
+ * 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 int run()
+{
+	sigset_t set;
+
+	sigemptyset(&set);
+	sigaddset(&set, SIGTERM);
+	sigprocmask(SIG_BLOCK, &set, NULL);
+
+	sd_notify(0, "READY=1\n");
+
+	while (TRUE)
+	{
+		int sig, error;
+
+		error = sigwait(&set, &sig);
+		if (error)
+		{
+			DBG1(DBG_DMN, "waiting for signal failed: %s", strerror(error));
+			return SS_RC_INITIALIZATION_FAILED;
+		}
+		switch (sig)
+		{
+			case SIGTERM:
+			{
+				DBG1(DBG_DMN, "SIGTERM received, shutting down");
+				charon->bus->alert(charon->bus, ALERT_SHUTDOWN_SIGNAL, sig);
+				return 0;
+			}
+			default:
+			{
+				DBG1(DBG_DMN, "unknown signal %d received. Ignored", sig);
+				break;
+			}
+		}
+	}
+}
+
+/**
+ * lookup UID and GID
+ */
+static bool lookup_uid_gid()
+{
+#ifdef IPSEC_USER
+	if (!lib->caps->resolve_uid(lib->caps, IPSEC_USER))
+	{
+		return FALSE;
+	}
+#endif /* IPSEC_USER */
+#ifdef IPSEC_GROUP
+	if (!lib->caps->resolve_gid(lib->caps, IPSEC_GROUP))
+	{
+		return FALSE;
+	}
+#endif /* IPSEC_GROUP */
+	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();
+}
+
+/**
+ * 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(libhydra_deinit);
+	if (!libhydra_init())
+	{
+		sd_notifyf(0, "STATUS=libhydra initialization 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=unkown uid/gid");
+		return SS_RC_INITIALIZATION_FAILED;
+	}
+	charon->load_loggers(charon, NULL, FALSE);
+
+	if (!charon->initialize(charon, PLUGINS))
+	{
+		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 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);
+
+	charon->start(charon);
+
+	sd_notifyf(0, "STATUS=charon-systemd running, strongSwan %s, %s %s, %s",
+			   VERSION, utsname.sysname, utsname.release, utsname.machine);
+
+	return run();
+}