ubusd: log ACL init errors

This makes it easier to notice ubusd (and so often a system) failing to
start properly. Some users reported procd failing to initialize fully
without a clear error in case of faulty /etc/passwd.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: John Crispin <john@phrozen.org>

ubusd_acl.c

@@ -26,6 +26,7 @@
 #include <libubox/vlist.h>
 #include <libubox/blobmsg_json.h>
 #include <libubox/avl-cmp.h>
+#include <libubox/ulog.h>
 
 #include "ubusd.h"
 
@@ -175,19 +176,25 @@ ubusd_acl_init_client(struct ubus_client *cl, int fd)
 #ifdef SO_PEERCRED
 	unsigned int len = sizeof(struct ucred);
 
-	if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cred, &len) == -1)
+	if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cred, &len) == -1) {
+		ULOG_ERR("Failed getsockopt(): %m\n");
 		return -1;
+	}
 #else
 	memset(&cred, 0, sizeof(cred));
 #endif
 
 	pwd = getpwuid(cred.uid);
-	if (!pwd)
+	if (!pwd) {
+		ULOG_ERR("Failed getpwuid(): %m\n");
 		return -1;
+	}
 
 	group = getgrgid(cred.gid);
-	if (!group)
+	if (!group) {
+		ULOG_ERR("Failed getgrgid(): %m\n");
 		return -1;
+	}
 
 	cl->uid = cred.uid;
 	cl->gid = cred.gid;

ubusd_main.c

@@ -233,6 +233,8 @@ static void mkdir_sockdir()
 	free(ubus_sock_dir);
 }
 
+#include <libubox/ulog.h>
+
 int main(int argc, char **argv)
 {
 	const char *ubus_socket = UBUS_UNIX_SOCKET;
@@ -242,6 +244,7 @@ int main(int argc, char **argv)
 	signal(SIGPIPE, SIG_IGN);
 	signal(SIGHUP, sighup_handler);
 
+	ulog_open(ULOG_KMSG | ULOG_SYSLOG, LOG_DAEMON, "ubusd");
 	openlog("ubusd", LOG_PID, LOG_DAEMON);
 	uloop_init();