libsystemd-rtnl: add a rtnetlink library

This is intentionally as similar to sd-bus as possible. While it
would be simple to export it, the intentions is to keep this
internal (at least for the forseeable future).

Currently only synchronous communication is implemented

1 files changed, 126 insertions, 0 deletions

diff --git a/src/libsystemd-rtnl/test-rtnl.c b/src/libsystemd-rtnl/test-rtnl.c
new file mode 100644
index 0000000000..bcfd816688
--- /dev/null
+++ b/src/libsystemd-rtnl/test-rtnl.c
@@ -0,0 +1,126 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2013 Tom Gundersen <teg@jklm.no>
+
+  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 <netinet/ether.h>
+
+#include "util.h"
+#include "macro.h"
+#include "sd-rtnl.h"
+#include "socket-util.h"
+
+static void test_link_configure(sd_rtnl *rtnl, int ifindex) {
+        _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *message;
+        __u16 type;
+        const char *mac = "98:fe:94:3f:c6:18", *name = "test";
+        unsigned int mtu = 1450;
+        void *data;
+
+        /* we'd really like to test NEWLINK, but let's not mess with the running kernel */
+        assert(sd_rtnl_message_link_new(RTM_GETLINK, ifindex, 0, 0, &message) >= 0);
+        assert(sd_rtnl_message_append(message, IFLA_IFNAME, name) >= 0);
+        assert(sd_rtnl_message_append(message, IFLA_ADDRESS, ether_aton(mac)) >= 0);
+        assert(sd_rtnl_message_append(message, IFLA_MTU, &mtu) >= 0);
+
+        assert(sd_rtnl_message_read(message, &type, &data) >= 0);
+        assert(type == IFLA_IFNAME);
+        assert(streq(name, (char *) data));
+
+        assert(sd_rtnl_message_read(message, &type, &data) >= 0);
+        assert(type == IFLA_ADDRESS);
+        assert(streq(mac, ether_ntoa(data)));
+
+        assert(sd_rtnl_message_read(message, &type, &data) >= 0);
+        assert(type == IFLA_MTU);
+        assert(mtu == *(unsigned int *) data);
+
+        /* let's assume that this test is always ran when the loopback device is up, so that it will fail */
+        assert(sd_rtnl_send_with_reply_and_block(rtnl, message, 2 * USEC_PER_SEC, NULL) == 0);
+}
+
+int main(void) {
+        sd_rtnl *rtnl;
+        sd_rtnl_message *m;
+        sd_rtnl_message *r;
+        void *data;
+        int if_loopback;
+        __u16 type;
+        unsigned int mtu = 0;
+        unsigned int *mtu_reply;
+
+        assert(sd_rtnl_open(0, &rtnl) >= 0);
+        assert(rtnl);
+
+        if_loopback = (int) if_nametoindex("lo");
+        assert(if_loopback > 0);
+
+        test_link_configure(rtnl, if_loopback);
+
+        assert(sd_rtnl_message_link_new(RTM_GETLINK, if_loopback, 0, 0, &m) >= 0);
+        assert(m);
+
+        assert(sd_rtnl_message_get_type(m, &type) >= 0);
+        assert(type == RTM_GETLINK);
+
+        assert(sd_rtnl_message_read(m, &type, &data) == 0);
+
+        assert(sd_rtnl_send_with_reply_and_block(rtnl, m, 100000000, &r) >= 0);
+        assert(sd_rtnl_message_get_type(r, &type) >= 0);
+        assert(type == RTM_NEWLINK);
+
+        assert(sd_rtnl_message_read(m, &type, data) == 0);
+        assert((r = sd_rtnl_message_unref(r)) == NULL);
+
+        assert(sd_rtnl_send_with_reply_and_block(rtnl, m, -1, &r) == -EPERM);
+        assert((m = sd_rtnl_message_unref(m)) == NULL);
+        assert((r = sd_rtnl_message_unref(r)) == NULL);
+
+        assert(sd_rtnl_message_link_new(RTM_GETLINK, if_loopback, 0, 0, &m) >= 0);
+        assert(m);
+
+        assert(sd_rtnl_message_append(m, IFLA_MTU, &mtu) >= 0);
+        assert(sd_rtnl_message_read(m, &type, (void **) &mtu_reply) == 1);
+
+        assert(type == IFLA_MTU);
+        assert(*mtu_reply == 0);
+
+        assert(sd_rtnl_message_read(m, &type, data) == 0);
+
+        assert(sd_rtnl_send_with_reply_and_block(rtnl, m, -1, &r) >= 0);
+        while (sd_rtnl_message_read(r, &type, &data)) {
+                switch (type) {
+                        case IFLA_MTU:
+                                assert(*(unsigned int *) data == 65536);
+                                break;;
+                        case IFLA_IFNAME:
+                                assert(streq((char *) data, "lo"));
+                                break;;
+                        case IFLA_QDISC:
+                                assert(streq((char *) data, "noqueue"));
+                                break;;
+                }
+        }
+
+        assert((m = sd_rtnl_message_unref(m)) == NULL);
+        assert((r = sd_rtnl_message_unref(r)) == NULL);
+        assert((rtnl = sd_rtnl_unref(rtnl)) == NULL);
+
+        return EXIT_SUCCESS;
+}