/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright (C) 2014 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 <stdlib.h> #include <errno.h> #include <unistd.h> #include <linux/veth.h> #include <net/if.h> #include "sd-event.h" #include "sd-netlink.h" #include "sd-ipv4ll.h" #include "util.h" #include "event-util.h" #include "netlink-util.h" #include "in-addr-util.h" static void ll_handler(sd_ipv4ll *ll, int event, void *userdata) { _cleanup_free_ char *address = NULL; struct in_addr addr = {}; assert_se(ll); if (sd_ipv4ll_get_address(ll, &addr) >= 0) assert_se(in_addr_to_string(AF_INET, (const union in_addr_union*) &addr, &address) >= 0); switch (event) { case SD_IPV4LL_EVENT_BIND: log_info("bound %s", strna(address)); break; case SD_IPV4LL_EVENT_CONFLICT: log_info("conflict on %s", strna(address)); break; case SD_IPV4LL_EVENT_STOP: log_error("the client was stopped with address %s", strna(address)); break; default: assert_not_reached("invalid LL event"); } } static int client_run(int ifindex, const char *seed_str, const struct ether_addr *ha, sd_event *e) { sd_ipv4ll *ll; assert_se(sd_ipv4ll_new(&ll) >= 0); assert_se(sd_ipv4ll_attach_event(ll, e, 0) >= 0); assert_se(sd_ipv4ll_set_index(ll, ifindex) >= 0); assert_se(sd_ipv4ll_set_mac(ll, ha) >= 0); assert_se(sd_ipv4ll_set_callback(ll, ll_handler, NULL) >= 0); if (seed_str) { unsigned seed; assert_se(safe_atou(seed_str, &seed) >= 0); assert_se(sd_ipv4ll_set_address_seed(ll, seed) >= 0); } log_info("starting IPv4LL client"); assert_se(sd_ipv4ll_start(ll) >= 0); assert_se(sd_event_loop(e) >= 0); assert_se(!sd_ipv4ll_unref(ll)); return EXIT_SUCCESS; } static int test_ll(const char *ifname, const char *seed) { _cleanup_event_unref_ sd_event *e = NULL; _cleanup_netlink_unref_ sd_netlink *rtnl = NULL; _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL, *reply = NULL; struct ether_addr ha; int ifindex; assert_se(sd_event_new(&e) >= 0); assert_se(sd_netlink_open(&rtnl) >= 0); assert_se(sd_netlink_attach_event(rtnl, e, 0) >= 0); assert_se(sd_rtnl_message_new_link(rtnl, &m, RTM_GETLINK, 0) >= 0); assert_se(sd_netlink_message_append_string(m, IFLA_IFNAME, ifname) >= 0); assert_se(sd_netlink_call(rtnl, m, 0, &reply) >= 0); assert_se(sd_rtnl_message_link_get_ifindex(reply, &ifindex) >= 0); assert_se(sd_netlink_message_read_ether_addr(reply, IFLA_ADDRESS, &ha) >= 0); client_run(ifindex, seed, &ha, e); return EXIT_SUCCESS; } int main(int argc, char *argv[]) { log_set_max_level(LOG_DEBUG); log_parse_environment(); log_open(); if (argc == 2) return test_ll(argv[1], NULL); else if (argc == 3) return test_ll(argv[1], argv[2]); else { log_error("This program takes one or two arguments.\n" "\t %s <ifname> [<seed>]", program_invocation_short_name); return EXIT_FAILURE; } }