varlink: add varlink_get_peer_gid() helper

diff --git a/src/shared/varlink.c b/src/shared/varlink.c
index d4072ec398281508392fd0b31905f835a72cff8a..1bfa4c70818b77d55dc70e6caf00127c72c3c7b8 100644 (file)
--- a/src/shared/varlink.c
+++ b/src/shared/varlink.c
@@ -2807,12 +2807,29 @@ int varlink_get_peer_uid(Varlink *v, uid_t *ret) {
                 return varlink_log_errno(v, r, "Failed to acquire credentials: %m");
 
         if (!uid_is_valid(v->ucred.uid))
-                return varlink_log_errno(v, SYNTHETIC_ERRNO(ENODATA), "Peer uid is invalid.");
+                return varlink_log_errno(v, SYNTHETIC_ERRNO(ENODATA), "Peer UID is invalid.");
 
         *ret = v->ucred.uid;
         return 0;
 }
 
+int varlink_get_peer_gid(Varlink *v, gid_t *ret) {
+        int r;
+
+        assert_return(v, -EINVAL);
+        assert_return(ret, -EINVAL);
+
+        r = varlink_acquire_ucred(v);
+        if (r < 0)
+                return varlink_log_errno(v, r, "Failed to acquire credentials: %m");
+
+        if (!gid_is_valid(v->ucred.gid))
+                return varlink_log_errno(v, SYNTHETIC_ERRNO(ENODATA), "Peer GID is invalid.");
+
+        *ret = v->ucred.gid;
+        return 0;
+}
+
 int varlink_get_peer_pid(Varlink *v, pid_t *ret) {
         int r;
 

diff --git a/src/shared/varlink.h b/src/shared/varlink.h
index db7227b215472a03c439855af8fb26da6f4724c5..c8639f4d7f027e4ffa03ff781219588caab01fd1 100644 (file)
--- a/src/shared/varlink.h
+++ b/src/shared/varlink.h
@@ -173,6 +173,7 @@ void* varlink_set_userdata(Varlink *v, void *userdata);
 void* varlink_get_userdata(Varlink *v);
 
 int varlink_get_peer_uid(Varlink *v, uid_t *ret);
+int varlink_get_peer_gid(Varlink *v, gid_t *ret);
 int varlink_get_peer_pid(Varlink *v, pid_t *ret);
 int varlink_get_peer_pidref(Varlink *v, PidRef *ret);