3 * Copyright 2014 Roy Marples <roy@marples.name>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 #if __GNUC__ > 2 || defined(__INTEL_COMPILER)
42 # define __dead __attribute__((__noreturn__))
45 # define __unused __attribute__((__unused__))
57 #define timespeccmp(tsp, usp, cmp) \
58 (((tsp)->tv_sec == (usp)->tv_sec) ? \
59 ((tsp)->tv_nsec cmp (usp)->tv_nsec) : \
60 ((tsp)->tv_sec cmp (usp)->tv_sec))
63 #define timespecsub(tsp, usp, vsp) \
65 (vsp)->tv_sec = (tsp)->tv_sec - (usp)->tv_sec; \
66 (vsp)->tv_nsec = (tsp)->tv_nsec - (usp)->tv_nsec; \
67 if ((vsp)->tv_nsec < 0) { \
69 (vsp)->tv_nsec += 1000000000L; \
71 } while (/* CONSTCOND */ 0)
75 do_exit(DHCPCD_CONNECTION *con, int code)
78 /* Unregister the status callback so that close doesn't spam. */
79 dhcpcd_set_status_callback(con, NULL, NULL);
87 do_status_cb(DHCPCD_CONNECTION *con, const char *status, void *arg)
91 syslog(LOG_INFO, "%s", status);
92 if (strcmp(status, "connected") == 0)
93 do_exit(con, EXIT_SUCCESS);
94 if (strcmp(status, "down") == 0) {
101 main(int argc, char **argv)
103 DHCPCD_CONNECTION *con;
105 struct timespec now, end, t;
107 int timeout, n, lerrno;
116 openlog("dhcpcd-online", LOG_PERROR, 0);
117 setlogmask(LOG_UPTO(LOG_INFO));
119 while ((n = getopt(argc, argv, "qt:x")) != -1) {
123 openlog("dhcpcd-online", 0, 0);
126 lnum = strtol(optarg, &lend, 0);
127 if (lend == NULL || *lend != '\0' ||
128 lnum < 0 || lnum > INT_MAX)
130 syslog(LOG_ERR, "-t %s: invalid timeout",
140 fprintf(stderr, "usage: dhcpcd-online "
141 "[-q] [-t timeout]\n");
146 if ((con = dhcpcd_new()) == NULL) {
147 syslog(LOG_ERR, "dhcpcd_new: %m");
151 dhcpcd_set_status_callback(con, do_status_cb, &pfd);
153 if ((pfd.fd = dhcpcd_open(con)) == -1) {
155 syslog(LOG_WARNING, "dhcpcd_open: %m");
157 do_exit(con, EXIT_FAILURE);
163 /* Work out our timeout time */
164 if (clock_gettime(CLOCK_MONOTONIC, &end) == -1) {
165 syslog(LOG_ERR, "clock_gettime: %m");
166 do_exit(con, EXIT_FAILURE);
168 end.tv_sec += timeout;
171 if (clock_gettime(CLOCK_MONOTONIC, &now) == -1) {
172 syslog(LOG_ERR, "clock_gettime: %m");
173 do_exit(con, EXIT_FAILURE);
175 if (timespeccmp(&now, &end, >)) {
176 syslog(LOG_ERR, "timed out");
177 do_exit(con, EXIT_FAILURE);
180 n = poll(NULL, 0, DHCPCD_RETRYOPEN);
182 /* poll(2) should really take a timespec */
183 timespecsub(&end, &now, &t);
184 if (t.tv_sec > INT_MAX / 1000 ||
185 (t.tv_sec == INT_MAX / 1000 &&
186 (t.tv_nsec + 999999) / 1000000 > INT_MAX % 1000000))
189 timeout = (int)(t.tv_sec * 1000 +
190 (t.tv_nsec + 999999) / 1000000);
191 n = poll(&pfd, 1, timeout);
194 syslog(LOG_ERR, "poll: %m");
195 do_exit(con, EXIT_FAILURE);
198 if ((pfd.fd = dhcpcd_open(con)) == -1) {
199 if (lerrno != errno) {
201 syslog(LOG_WARNING, "dhcpcd_open: %m");
205 if (n > 0 && pfd.revents)
206 dhcpcd_dispatch(con);
210 /* Impossible to reach here */
211 do_exit(con, EXIT_FAILURE);