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Diffstat (limited to 'usr.sbin/dhcpd/dhcpd.c')
-rw-r--r--usr.sbin/dhcpd/dhcpd.c370
1 files changed, 370 insertions, 0 deletions
diff --git a/usr.sbin/dhcpd/dhcpd.c b/usr.sbin/dhcpd/dhcpd.c
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index 00000000000..eff62fd6047
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+++ b/usr.sbin/dhcpd/dhcpd.c
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+/* dhcpd.c
+
+ DHCP Server Daemon. */
+
+/*
+ * Copyright (c) 1995, 1996, 1997, 1998, 1999
+ * The Internet Software Consortium. 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.
+ * 3. Neither the name of The Internet Software Consortium nor the names
+ * of its contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM 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 INTERNET SOFTWARE CONSORTIUM 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.
+ *
+ * This software has been written for the Internet Software Consortium
+ * by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
+ * Enterprises. To learn more about the Internet Software Consortium,
+ * see ``http://www.vix.com/isc''. To learn more about Vixie
+ * Enterprises, see ``http://www.vix.com''.
+ */
+
+
+static char copyright[] =
+"Copyright 1995, 1996, 1997, 1998, 1999 The Internet Software Consortium.";
+static char arr [] = "All rights reserved.";
+static char message [] = "Internet Software Consortium DHCP Server";
+static char contrib [] = "Please contribute if you find this software useful.";
+static char url [] = "For info, please visit http://www.isc.org/dhcp-contrib.html";
+
+#include "dhcpd.h"
+#include "version.h"
+
+static void usage PROTO ((char *));
+
+TIME cur_time;
+struct group root_group;
+
+struct iaddr server_identifier;
+int server_identifier_matched;
+
+u_int16_t local_port;
+u_int16_t remote_port;
+
+int log_priority;
+#ifdef DEBUG
+int log_perror = -1;
+#else
+int log_perror = 1;
+#endif
+
+char *path_dhcpd_conf = _PATH_DHCPD_CONF;
+char *path_dhcpd_db = _PATH_DHCPD_DB;
+char *path_dhcpd_pid = _PATH_DHCPD_PID;
+
+int main (argc, argv)
+ int argc;
+ char **argv;
+{
+ int i, status;
+ struct servent *ent;
+ char *s, *appname;
+ int cftest = 0;
+#ifndef DEBUG
+ int pidfilewritten = 0;
+ int pid;
+ char pbuf [20];
+ int daemon = 1;
+#endif
+ int quiet = 0;
+
+ appname = strrchr (argv [0], '/');
+ if (!appname)
+ appname = argv [0];
+ else
+ appname++;
+
+ /* Initially, log errors to stderr as well as to syslogd. */
+ openlog (appname, LOG_NDELAY, DHCPD_LOG_FACILITY);
+ setlogmask (LOG_UPTO (LOG_INFO));
+
+ for (i = 1; i < argc; i++) {
+ if (!strcmp (argv [i], "-p")) {
+ if (++i == argc)
+ usage (appname);
+ for (s = argv [i]; *s; s++)
+ if (!isdigit (*s))
+ error ("%s: not a valid UDP port",
+ argv [i]);
+ status = atoi (argv [i]);
+ if (status < 1 || status > 65535)
+ error ("%s: not a valid UDP port",
+ argv [i]);
+ local_port = htons (status);
+ debug ("binding to user-specified port %d",
+ ntohs (local_port));
+ } else if (!strcmp (argv [i], "-f")) {
+#ifndef DEBUG
+ daemon = 0;
+#endif
+ } else if (!strcmp (argv [i], "-d")) {
+#ifndef DEBUG
+ daemon = 0;
+#endif
+ log_perror = -1;
+ } else if (!strcmp (argv [i], "-cf")) {
+ if (++i == argc)
+ usage (appname);
+ path_dhcpd_conf = argv [i];
+ } else if (!strcmp (argv [i], "-pf")) {
+ if (++i == argc)
+ usage (appname);
+ path_dhcpd_pid = argv [i];
+ } else if (!strcmp (argv [i], "-lf")) {
+ if (++i == argc)
+ usage (appname);
+ path_dhcpd_db = argv [i];
+ } else if (!strcmp (argv [i], "-t")) {
+ /* test configurations only */
+#ifndef DEBUG
+ daemon = 0;
+#endif
+ cftest = 1;
+ log_perror = -1;
+ } else if (!strcmp (argv [i], "-q")) {
+ quiet = 1;
+ quiet_interface_discovery = 1;
+ } else if (argv [i][0] == '-') {
+ usage (appname);
+ } else {
+ struct interface_info *tmp =
+ ((struct interface_info *)
+ dmalloc (sizeof *tmp, "get_interface_list"));
+ if (!tmp)
+ error ("Insufficient memory to %s %s",
+ "record interface", argv [i]);
+ memset (tmp, 0, sizeof *tmp);
+ strlcpy (tmp->name, argv [i], sizeof(tmp->name));
+ tmp->next = interfaces;
+ tmp->flags = INTERFACE_REQUESTED;
+ interfaces = tmp;
+ }
+ }
+
+ if (!quiet) {
+ note ("%s %s", message, DHCP_VERSION);
+ note ("%s", copyright);
+ note ("%s", arr);
+ note ("%s", "");
+ note ("%s", contrib);
+ note ("%s", url);
+ note ("%s", "");
+ } else
+ log_perror = 0;
+
+ /* Default to the DHCP/BOOTP port. */
+ if (!local_port)
+ {
+ ent = getservbyname ("dhcp", "udp");
+ if (!ent)
+ local_port = htons (67);
+ else
+ local_port = ent -> s_port;
+#ifndef __CYGWIN32__ /* XXX */
+ endservent ();
+#endif
+ }
+
+ remote_port = htons (ntohs (local_port) + 1);
+
+ /* Get the current time... */
+ GET_TIME (&cur_time);
+
+ /* Read the dhcpd.conf file... */
+ if (!readconf ())
+ error ("Configuration file errors encountered -- exiting");
+
+ /* test option should cause an early exit */
+ if (cftest)
+ exit(0);
+
+ /* Start up the database... */
+ db_startup ();
+
+ /* Discover all the network interfaces and initialize them. */
+ discover_interfaces (DISCOVER_SERVER);
+
+ /* Initialize icmp support... */
+ icmp_startup (1, lease_pinged);
+
+#ifndef DEBUG
+ if (daemon) {
+ /* First part of becoming a daemon... */
+ if ((pid = fork ()) == -1)
+ error ("Can't fork daemon: %m");
+ else if (pid)
+ exit (0);
+ }
+
+ /* Read previous pid file. */
+ if ((i = open (path_dhcpd_pid, O_RDONLY)) != -1) {
+ status = read (i, pbuf, (sizeof pbuf) - 1);
+ close (i);
+ pbuf [status] = 0;
+ pid = atoi (pbuf);
+
+ /* If the previous server process is not still running,
+ write a new pid file immediately. */
+ if (pid && (pid == getpid () || kill (pid, 0) == -1)) {
+ unlink (path_dhcpd_pid);
+ if ((i = open (path_dhcpd_pid,
+ O_WRONLY | O_CREAT, 0640)) != -1) {
+ snprintf (pbuf, sizeof(pbuf), "%d\n",
+ (int)getpid ());
+ write (i, pbuf, strlen (pbuf));
+ close (i);
+ pidfilewritten = 1;
+ }
+ } else
+ error ("There's already a DHCP server running.\n");
+ }
+
+ /* If we were requested to log to stdout on the command line,
+ keep doing so; otherwise, stop. */
+ if (log_perror == -1)
+ log_perror = 1;
+ else
+ log_perror = 0;
+
+ if (daemon) {
+ /* Become session leader and get pid... */
+ close (0);
+ close (1);
+ close (2);
+ pid = setsid ();
+ }
+
+ /* If we didn't write the pid file earlier because we found a
+ process running the logged pid, but we made it to here,
+ meaning nothing is listening on the bootp port, then write
+ the pid file out - what's in it now is bogus anyway. */
+ if (!pidfilewritten) {
+ unlink (path_dhcpd_pid);
+ if ((i = open (path_dhcpd_pid,
+ O_WRONLY | O_CREAT, 0640)) != -1) {
+ snprintf (pbuf, sizeof(pbuf), "%d\n",
+ (int)getpid ());
+ write (i, pbuf, strlen (pbuf));
+ close (i);
+ pidfilewritten = 1;
+ }
+ }
+#endif /* !DEBUG */
+
+ /* Set up the bootp packet handler... */
+ bootp_packet_handler = do_packet;
+
+ /* Receive packets and dispatch them... */
+ dispatch ();
+
+ /* Not reached */
+ return 0;
+}
+
+/* Print usage message. */
+
+static void usage (appname)
+ char *appname;
+{
+ note ("%s", message);
+ note ("%s", copyright);
+ note ("%s", arr);
+ note ("%s", "");
+ note ("%s", contrib);
+ note ("%s", url);
+ note ("%s", "");
+
+ warn ("Usage: %s [-p <UDP port #>] [-d] [-f] [-cf config-file]",
+ appname);
+ error(" [-lf lease-file] [-pf pidfile] [if0 [...ifN]]");
+}
+
+void cleanup ()
+{
+}
+
+void lease_pinged (from, packet, length)
+ struct iaddr from;
+ u_int8_t *packet;
+ int length;
+{
+ struct lease *lp;
+
+ /* Don't try to look up a pinged lease if we aren't trying to
+ ping one - otherwise somebody could easily make us churn by
+ just forging repeated ICMP EchoReply packets for us to look
+ up. */
+ if (!outstanding_pings)
+ return;
+
+ lp = find_lease_by_ip_addr (from);
+
+ if (!lp) {
+ note ("unexpected ICMP Echo Reply from %s", piaddr (from));
+ return;
+ }
+
+ if (!lp -> state && ! lp -> releasing) {
+ warn ("ICMP Echo Reply for %s arrived late or is spurious.",
+ piaddr (from));
+ return;
+ }
+
+ /* At this point it looks like we pinged a lease and got a
+ * response, which shouldn't have happened.
+ * if it did it's either one of two two cases:
+ * 1 - we pinged this lease before offering it and
+ * something answered, so we abandon it.
+ * 2 - we pinged this lease before releaseing it
+ * and something answered, so we don't release it.
+ */
+ if (lp -> releasing) {
+ warn ("IP address %s answers a ping after sending a release",
+ piaddr (lp -> ip_addr));
+ warn ("Possible release spoof - Not releasing address %s",
+ piaddr (lp -> ip_addr));
+ lp -> releasing = 0;
+ }
+ else {
+ free_lease_state (lp -> state, "lease_pinged");
+ lp -> state = (struct lease_state *)0;
+ abandon_lease (lp, "pinged before offer");
+ }
+ cancel_timeout (lease_ping_timeout, lp);
+ --outstanding_pings;
+}
+
+void lease_ping_timeout (vlp)
+ void *vlp;
+{
+ struct lease *lp = vlp;
+
+ --outstanding_pings;
+ if (lp->releasing) {
+ lp->releasing = 0;
+ release_lease(lp);
+ }
+ else
+ dhcp_reply (lp);
+}
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