--- /dev/null
+.\" Copyright (c) 2014 Roy Marples
+.\" All rights reserved
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd September 2, 2014
+.Dt DHCPCD-ONLINE
+.Os
+.Sh NAME
+.Nm dhcpcd-online
+.Nd a utility to work out if
+.Xr dhcpcd 8
+is in the connected state
+.Sh SYNOPSIS
+.Nm
+.Op Fl q
+.Op Fl t Ar timeout
+.Op Fl x
+.Sh DESCRIPTION
+.Nm
+connects to
+.Xr dhcpcd 8
+and waits for a maximum of
+.Ar timeout
+seconds until the status changes to
+.Va connected .
+This tool is intended for use in the startup of the host system
+where
+.Xr dhcpcd 8
+is started in parallel with other services who depend on a network connection
+being available.
+.Pp
+Options:
+.Bl -tag --width flag
+.It Fl q
+Suppresses the reporting of non error messages.
+.It Fl t Ar timeout
+Sets the number of seconds
+.Nm
+waits for
+.Xr dhcpcd 8
+to reach the connected state.
+If not specified, a default value of 30 is used.
+.It Fl x
+Exits immediately if
+.Xr dhcpcd 8
+is not running.
+.El
+.Sh AUTHORS
+.An Roy Marples Aq roy@marples.name
+.Sh BUGS
+Please report them to http://roy.marples.name/projects/dhcpcd-ui
--- /dev/null
+/*
+ * dhcpcd-online
+ * Copyright 2014 Roy Marples <roy@marples.name>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <errno.h>
+#include <limits.h>
+#include <poll.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "dhcpcd.h"
+
+#if __GNUC__ > 2 || defined(__INTEL_COMPILER)
+# ifndef __dead
+# define __dead __attribute__((__noreturn__))
+# endif
+# ifndef __unused
+# define __unused __attribute__((__unused__))
+# endif
+#else
+# ifndef __dead
+# define __dead
+# endif
+# ifndef __unused
+# define __unused
+# endif
+#endif
+
+static void __dead
+do_exit(DHCPCD_CONNECTION *con, int code)
+{
+
+ dhcpcd_close(con);
+ dhcpcd_free(con);
+ exit(code);
+}
+
+static void
+do_status_cb(DHCPCD_CONNECTION *con, const char *status, void __unused *arg)
+{
+
+ syslog(LOG_INFO, "%s", status);
+ if (strcmp(status, "connected") == 0)
+ do_exit(con, EXIT_SUCCESS);
+}
+
+int
+main(int argc, char **argv)
+{
+ DHCPCD_CONNECTION *con;
+ bool xflag;
+ struct timespec now, end, t;
+ struct pollfd pfd;
+ int timeout, n, lerrno;
+ long lnum;
+ char *lend;
+
+ /* Defaults */
+ timeout = 30;
+
+ xflag = false;
+
+ openlog("dhcpcd-online", LOG_PERROR, 0);
+ setlogmask(LOG_UPTO(LOG_INFO));
+
+ while ((n = getopt(argc, argv, "qt:x")) != -1) {
+ switch (n) {
+ case 'q':
+ closelog();
+ openlog("dhcpcd-online", 0, 0);
+ break;
+ case 't':
+ lnum = strtol(optarg, &lend, 0);
+ if (lend == NULL || *lend != '\0' ||
+ lnum < 0 || lnum > INT_MAX)
+ {
+ syslog(LOG_ERR, "-t %s: invalid timeout",
+ optarg);
+ exit(EXIT_FAILURE);
+ }
+ timeout = (int)lnum;
+ break;
+ case 'x':
+ xflag = true;
+ break;
+ case '?':
+ fprintf(stderr, "usage: dhcpcd-online "
+ "[-q] [-t timeout]\n");
+ exit(EXIT_FAILURE);
+ }
+ }
+
+ if ((con = dhcpcd_new()) == NULL) {
+ syslog(LOG_ERR, "dhcpcd_new: %m");
+ return EXIT_FAILURE;
+ }
+
+ dhcpcd_set_status_callback(con, do_status_cb, NULL);
+
+ if ((pfd.fd = dhcpcd_open(con)) == -1) {
+ lerrno = errno;
+ syslog(LOG_WARNING, "dhcpcd_open: %m");
+ if (xflag)
+ do_exit(con, EXIT_FAILURE);
+ } else
+ lerrno = 0;
+ pfd.events = POLLIN;
+ pfd.revents = 0;
+
+ /* Work out our timeout time */
+ if (clock_gettime(CLOCK_MONOTONIC, &end) == -1) {
+ syslog(LOG_ERR, "clock_gettime: %m");
+ do_exit(con, EXIT_FAILURE);
+ }
+ end.tv_sec += timeout;
+
+ for (;;) {
+ if (clock_gettime(CLOCK_MONOTONIC, &now) == -1) {
+ syslog(LOG_ERR, "clock_gettime: %m");
+ do_exit(con, EXIT_FAILURE);
+ }
+ if (timespeccmp(&now, &end, >)) {
+ syslog(LOG_ERR, "timed out");
+ do_exit(con, EXIT_FAILURE);
+ }
+ if (pfd.fd == -1) {
+ n = poll(NULL, 0, DHCPCD_RETRYOPEN);
+ } else {
+ /* poll(2) should really take a timespec */
+ timespecsub(&end, &now, &t);
+ if (t.tv_sec > INT_MAX / 1000 ||
+ (t.tv_sec == INT_MAX / 1000 &&
+ (t.tv_nsec + 999999) / 1000000 > INT_MAX % 1000000))
+ timeout = INT_MAX;
+ else
+ timeout = (int)t.tv_sec * 1000 +
+ (t.tv_nsec + 999999) / 1000000;
+ n = poll(&pfd, 1, timeout);
+ }
+ if (n == -1) {
+ syslog(LOG_ERR, "poll: %m");
+ do_exit(con, EXIT_FAILURE);
+ }
+ if (pfd.fd == -1) {
+ if ((pfd.fd = dhcpcd_open(con)) == -1) {
+ if (lerrno != errno) {
+ lerrno = errno;
+ syslog(LOG_WARNING, "dhcpcd_open: %m");
+ }
+ }
+ } else {
+ if (n > 0 && pfd.revents)
+ dhcpcd_dispatch(con);
+ }
+ }
+
+ /* Impossible to reach here */
+ do_exit(con, EXIT_FAILURE);
+}
Roy's Projects / dhcpcd-ui / commitdiff