Don't depend on libsystemd-daemon for systemd integration, always use systemd integration on Linux

3 files changed, 42 insertions, 12 deletions

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 6ea65e8..e7fb940 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,8 +1,8 @@
 set_directory_properties(PROPERTIES COMPILE_DEFINITIONS _GNU_SOURCE)
-set(FASTD_CFLAGS "-pthread -std=c99 ${UECC_CFLAGS_OTHER} ${NACL_CFLAGS_OTHER} ${OPENSSL_CRYPTO_CFLAGS_OTHER} ${SYSTEMD_DAEMON_CFLAGS_OTHER} -Wall")
+set(FASTD_CFLAGS "-pthread -std=c99 ${UECC_CFLAGS_OTHER} ${NACL_CFLAGS_OTHER} ${OPENSSL_CRYPTO_CFLAGS_OTHER} -Wall")
 
 include_directories(${FASTD_SOURCE_DIR} ${FASTD_BINARY_DIR}/src)
-link_directories(${UECC_LIBRARY_DIRS} ${NACL_LIBRARY_DIRS} ${OPENSSL_CRYPTO_LIBRARY_DIRS} ${SYSTEMD_DAEMON_LIBRARY_DIRS})
+link_directories(${UECC_LIBRARY_DIRS} ${NACL_LIBRARY_DIRS} ${OPENSSL_CRYPTO_LIBRARY_DIRS})
 
 
 include(generate_version)
@@ -38,9 +38,9 @@ add_executable(fastd
   ${BISON_fastd_config_parse_OUTPUTS}
 )
 set_property(TARGET fastd PROPERTY COMPILE_FLAGS "${FASTD_CFLAGS}")
-set_property(TARGET fastd PROPERTY LINK_FLAGS "-pthread ${UECC_LDFLAGS_OTHER} ${NACL_LDFLAGS_OTHER} ${OPENSSL_CRYPTO_LDFLAGS_OTHER} ${SYSTEMD_DAEMON_LDFLAGS_OTHER}")
-set_property(TARGET fastd APPEND PROPERTY INCLUDE_DIRECTORIES ${CAP_INCLUDE_DIR} ${NACL_INCLUDE_DIRS} ${SYSTEMD_DAEMON_INCLUDE_DIRS})
-target_link_libraries(fastd protocols methods ciphers macs ${RT_LIBRARY} ${CAP_LIBRARY} ${UECC_LIBRARIES} ${NACL_LIBRARIES} ${OPENSSL_CRYPTO_LIBRARIES} ${SYSTEMD_DAEMON_LIBRARIES})
+set_property(TARGET fastd PROPERTY LINK_FLAGS "-pthread ${UECC_LDFLAGS_OTHER} ${NACL_LDFLAGS_OTHER} ${OPENSSL_CRYPTO_LDFLAGS_OTHER}")
+set_property(TARGET fastd APPEND PROPERTY INCLUDE_DIRECTORIES ${CAP_INCLUDE_DIR} ${NACL_INCLUDE_DIRS})
+target_link_libraries(fastd protocols methods ciphers macs ${RT_LIBRARY} ${CAP_LIBRARY} ${UECC_LIBRARIES} ${NACL_LIBRARIES} ${OPENSSL_CRYPTO_LIBRARIES})
 
 add_dependencies(fastd version)
 
diff --git a/src/fastd.c b/src/fastd.c
index a6b8310..bbc5c61 100644
--- a/src/fastd.c
+++ b/src/fastd.c
@@ -51,8 +51,8 @@
 #include <openssl/err.h>
 #endif
 
-#ifdef ENABLE_SYSTEMD
-#include <systemd/sd-daemon.h>
+#ifdef USE_SYSTEMD
+#include <sys/un.h>
 #endif
 
 
@@ -873,11 +873,42 @@ static int daemonize(fastd_context_t *ctx) {
 	return -1;
 }
 
+#ifdef USE_SYSTEMD
+static void notify_systemd(fastd_context_t *ctx, const char *notify_socket) {
+	int fd;
+	struct sockaddr_un sa = {};
+
+	if ((notify_socket[0] != '@' && notify_socket[0] != '/') || notify_socket[1] == 0)
+		return;
+
+	fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
+	if (fd < 0)
+		return;
+
+	sa.sun_family = AF_UNIX;
+
+	strncpy(sa.sun_path, notify_socket, sizeof(sa.sun_path));
+	if (sa.sun_path[0] == '@')
+		sa.sun_path[0] = 0;
+
+	if (connect(fd, (struct sockaddr*)&sa, offsetof(struct sockaddr_un, sun_path) + strnlen(notify_socket, sizeof(sa.sun_path))) < 0) {
+		pr_debug_errno(ctx, "unable to connect to notify socket: connect");
+		close(fd);
+		return;
+	}
+
+	dprintf(fd, "READY=1\nMAINPID=%lu", (unsigned long) getpid());
+	pr_debug(ctx, "sent startup notification to systemd");
+
+	close(fd);
+}
+#endif
+
 int main(int argc, char *argv[]) {
 	fastd_context_t ctx = {};
 	int status_fd = -1;
 
-#ifdef ENABLE_SYSTEMD
+#ifdef USE_SYSTEMD
 	char *notify_socket = getenv("NOTIFY_SOCKET");
 
 	if (notify_socket) {
@@ -959,10 +990,9 @@ int main(int argc, char *argv[]) {
 
 	write_pid(&ctx, getpid());
 
-#ifdef ENABLE_SYSTEMD
+#ifdef USE_SYSTEMD
 	if (notify_socket) {
-		setenv("NOTIFY_SOCKET", notify_socket, 1);
-		sd_notifyf(1, "READY=1\nMAINPID=%lu", (unsigned long) getpid());
+		notify_systemd(&ctx, notify_socket);
 		free(notify_socket);
 	}
 #endif
diff --git a/src/fastd_config.h.in b/src/fastd_config.h.in
index 6851c25..4402139 100644
--- a/src/fastd_config.h.in
+++ b/src/fastd_config.h.in
@@ -37,6 +37,7 @@
 #cmakedefine USE_PKTINFO
 #cmakedefine USE_PACKET_MARK
 #cmakedefine USE_MULTIAF_BIND
+#cmakedefine USE_SYSTEMD
 
 
 #cmakedefine WITH_CAPABILITIES
@@ -48,7 +49,6 @@
 
 #cmakedefine HAVE_LIBSODIUM
 #cmakedefine ENABLE_OPENSSL
-#cmakedefine ENABLE_SYSTEMD
 
 #define MAX_CONFIG_DEPTH @MAX_CONFIG_DEPTH_NUM@