tree-wide: introduce new SOCKADDR_UN_LEN() macro, and use it everywhere

The macro determines the right length of a AF_UNIX "struct sockaddr_un" to pass to
connect() or bind(). It automatically figures out if the socket refers to an
abstract namespace socket, or a socket in the file system, and properly handles
the full length of the path field.

This macro is not only safer, but also simpler to use, than the usual
offsetof() + strlen() logic.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/journal/journald-server.c b/src/journal/journald-server.c
index e14d0ad980..8f82d2a838 100644
--- a/src/journal/journald-server.c
+++ b/src/journal/journald-server.c
@@ -1696,7 +1696,7 @@ static int server_connect_notify(Server *s) {
         if (sa.un.sun_path[0] == '@')
                 sa.un.sun_path[0] = 0;
 
-        r = connect(s->notify_fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(e));
+        r = connect(s->notify_fd, &sa.sa, SOCKADDR_UN_LEN(sa.un));
         if (r < 0)
                 return log_error_errno(errno, "Failed to connect to notify socket: %m");