1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright (C) 2013 Intel Corporation. All rights reserved.
7 Copyright (C) 2014 Tom Gundersen
9 systemd is free software; you can redistribute it and/or modify it
10 under the terms of the GNU Lesser General Public License as published by
11 the Free Software Foundation; either version 2.1 of the License, or
12 (at your option) any later version.
14 systemd is distributed in the hope that it will be useful, but
15 WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 Lesser General Public License for more details.
19 You should have received a copy of the GNU Lesser General Public License
20 along with systemd; If not, see <http://www.gnu.org/licenses/>.
23 #include <sys/ioctl.h>
25 #include "sd-dhcp-server.h"
26 #include "dhcp-server-internal.h"
27 #include "dhcp-internal.h"
29 sd_dhcp_server *sd_dhcp_server_ref(sd_dhcp_server *server) {
31 assert_se(REFCNT_INC(server->n_ref) >= 2);
36 sd_dhcp_server *sd_dhcp_server_unref(sd_dhcp_server *server) {
37 if (server && REFCNT_DEC(server->n_ref) <= 0) {
38 log_dhcp_server(server, "UNREF");
40 sd_dhcp_server_stop(server);
42 sd_event_unref(server->event);
49 int sd_dhcp_server_new(sd_dhcp_server **ret) {
50 _cleanup_dhcp_server_unref_ sd_dhcp_server *server = NULL;
52 assert_return(ret, -EINVAL);
54 server = new0(sd_dhcp_server, 1);
58 server->n_ref = REFCNT_INIT;
67 int sd_dhcp_server_attach_event(sd_dhcp_server *server, sd_event *event, int priority) {
70 assert_return(server, -EINVAL);
71 assert_return(!server->event, -EBUSY);
74 server->event = sd_event_ref(event);
76 r = sd_event_default(&server->event);
81 server->event_priority = priority;
86 int sd_dhcp_server_detach_event(sd_dhcp_server *server) {
87 assert_return(server, -EINVAL);
89 server->event = sd_event_unref(server->event);
94 sd_event *sd_dhcp_server_get_event(sd_dhcp_server *server) {
95 assert_return(server, NULL);
100 int sd_dhcp_server_stop(sd_dhcp_server *server) {
101 assert_return(server, -EINVAL);
103 server->receive_message =
104 sd_event_source_unref(server->receive_message);
106 server->fd = safe_close(server->fd);
108 log_dhcp_server(server, "STOPPED");
113 static int server_receive_message(sd_event_source *s, int fd,
114 uint32_t revents, void *userdata) {
115 _cleanup_free_ uint8_t *message = NULL;
116 sd_dhcp_server *server = userdata;
117 struct iovec iov = {};
118 struct msghdr msg = {
122 int buflen = 0, len, r;
126 r = ioctl(fd, FIONREAD, &buflen);
132 message = malloc0(buflen);
136 iov.iov_base = message;
137 iov.iov_len = buflen;
139 len = recvmsg(fd, &msg, 0);
143 log_dhcp_server(server, "received message");
148 int sd_dhcp_server_start(sd_dhcp_server *server) {
151 assert_return(server, -EINVAL);
152 assert_return(server->event, -EINVAL);
153 assert_return(!server->receive_message, -EBUSY);
154 assert_return(server->fd == -1, -EBUSY);
156 r = dhcp_network_bind_udp_socket(INADDR_ANY, DHCP_PORT_SERVER);
158 sd_dhcp_server_stop(server);
163 r = sd_event_add_io(server->event, &server->receive_message,
165 server_receive_message, server);
167 sd_dhcp_server_stop(server);
171 r = sd_event_source_set_priority(server->receive_message,
172 server->event_priority);
174 sd_dhcp_server_stop(server);
178 log_dhcp_server(server, "STARTED");