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-rw-r--r--src/userdb/userdbd.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/src/userdb/userdbd.c b/src/userdb/userdbd.c
new file mode 100644
index 0000000..0c321bf
--- /dev/null
+++ b/src/userdb/userdbd.c
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "daemon-util.h"
+#include "userdbd-manager.h"
+#include "log.h"
+#include "main-func.h"
+#include "signal-util.h"
+
+/* This service offers two Varlink services, both implementing io.systemd.UserDatabase:
+ *
+ * → io.systemd.NameServiceSwitch: this is a compatibility interface for glibc NSS: it responds to
+ * name lookups by checking the classic NSS interfaces and responding that.
+ *
+ * → io.systemd.Multiplexer: this multiplexes lookup requests to all Varlink services that have a
+ * socket in /run/systemd/userdb/. It's supposed to simplify clients that don't want to implement
+ * the full iterative logic on their own.
+ *
+ * → io.systemd.DropIn: this makes JSON user/group records dropped into /run/userdb/ available as
+ * regular users.
+ */
+
+static int run(int argc, char *argv[]) {
+ _cleanup_(manager_freep) Manager *m = NULL;
+ _unused_ _cleanup_(notify_on_cleanup) const char *notify_stop = NULL;
+ int r;
+
+ log_setup();
+
+ umask(0022);
+
+ if (argc != 1)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "This program takes no arguments.");
+
+ if (setenv("SYSTEMD_BYPASS_USERDB", "io.systemd.NameServiceSwitch:io.systemd.Multiplexer:io.systemd.DropIn", 1) < 0)
+ return log_error_errno(errno, "Failed to set $SYSTEMD_BYPASS_USERDB: %m");
+
+ assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGCHLD, SIGTERM, SIGINT, SIGUSR2, -1) >= 0);
+
+ r = manager_new(&m);
+ if (r < 0)
+ return log_error_errno(r, "Could not create manager: %m");
+
+ r = manager_startup(m);
+ if (r < 0)
+ return log_error_errno(r, "Failed to start up daemon: %m");
+
+ notify_stop = notify_start(NOTIFY_READY, NOTIFY_STOPPING);
+
+ r = sd_event_loop(m->event);
+ if (r < 0)
+ return log_error_errno(r, "Event loop failed: %m");
+
+ return 0;
+}
+
+DEFINE_MAIN_FUNCTION(run);