bus: add new sd_bus_creds object to encapsulate process credentials

This way we can unify handling of credentials that are attached to
messages, or can be queried for bus name owners or connection peers.

This also adds the ability to extend incomplete credential information
with data from /proc,

Also, provide a convenience call that will automatically determine the
most appropriate credential object for an incoming message, by using the
the attached information if possible, the sending name information if
available and otherwise the peer's credentials.

1 files changed, 46 insertions, 0 deletions

diff --git a/src/libsystemd-bus/test-bus-creds.c b/src/libsystemd-bus/test-bus-creds.c
new file mode 100644
index 0000000000..0a9b2ca466
--- /dev/null
+++ b/src/libsystemd-bus/test-bus-creds.c
@@ -0,0 +1,46 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2013 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "sd-bus.h"
+#include "bus-dump.h"
+#include "bus-util.h"
+#include "util.h"
+
+int main(int argc, char *argv[]) {
+        _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
+        int r;
+
+        r = sd_bus_creds_new_from_pid(0, _SD_BUS_CREDS_MAX, &creds);
+        assert_se(r >= 0);
+
+        bus_creds_dump(creds, NULL);
+
+        creds = sd_bus_creds_unref(creds);
+
+        r = sd_bus_creds_new_from_pid(1, _SD_BUS_CREDS_MAX, &creds);
+        if (r != -EACCES) {
+                assert_se(r >= 0);
+                putchar('\n');
+                bus_creds_dump(creds, NULL);
+        }
+
+        return 0;
+}