392 lines
9.7 KiB
C
392 lines
9.7 KiB
C
/* dhcrelay.c
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DHCP/BOOTP Relay Agent. */
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/*
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* Copyright (c) 1997, 1998, 1999 The Internet Software Consortium.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of The Internet Software Consortium nor the names
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* of its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
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* CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This software has been written for the Internet Software Consortium
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* by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
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* Enterprises. To learn more about the Internet Software Consortium,
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* see ``http://www.vix.com/isc''. To learn more about Vixie
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* Enterprises, see ``http://www.vix.com''.
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*/
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#ifndef lint
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static char ocopyright [] =
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"$Id: dhcrelay.c,v 1.1.1.14 1999/04/26 15:43:10 mellon Exp $ Copyright (c) 1997, 1998, 1999 The Internet Software Consortium. All rights reserved.\n";
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#endif /* not lint */
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#include "dhcpd.h"
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static void usage PROTO ((char *));
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TIME cur_time;
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TIME default_lease_time = 43200; /* 12 hours... */
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TIME max_lease_time = 86400; /* 24 hours... */
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struct tree_cache *global_options [256];
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int log_perror = 1;
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/* Needed to prevent linking against conflex.c. */
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int lexline;
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int lexchar;
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char *token_line;
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char *tlname;
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char *path_dhcrelay_pid = _PATH_DHCRELAY_PID;
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u_int16_t local_port;
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u_int16_t remote_port;
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int log_priority;
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struct server_list {
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struct server_list *next;
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struct sockaddr_in to;
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} *servers;
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static char copyright [] =
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"Copyright 1997, 1998, 1999 The Internet Software Consortium.";
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static char arr [] = "All rights reserved.";
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static char message [] = "Internet Software Consortium DHCP Relay Agent V2.0b1pl27";
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static char contrib [] = "Please contribute if you find this software useful.";
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static char url [] = "For info, please visit http://www.isc.org/dhcp-contrib.html";
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int main (argc, argv, envp)
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int argc;
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char **argv, **envp;
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{
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int i;
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struct servent *ent;
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struct server_list *sp = (struct server_list *)0;
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int no_daemon = 0;
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int quiet = 0;
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char *s;
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s = strchr (argv [0], '/');
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if (!s)
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s = argv [0];
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else
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s++;
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/* Initially, log errors to stderr as well as to syslogd. */
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#ifdef SYSLOG_4_2
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openlog (s, LOG_NDELAY);
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log_priority = DHCPD_LOG_FACILITY;
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#else
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openlog (s, LOG_NDELAY, DHCPD_LOG_FACILITY);
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#endif
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#if !(defined (DEBUG) || defined (SYSLOG_4_2))
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setlogmask (LOG_UPTO (LOG_INFO));
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#endif
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for (i = 1; i < argc; i++) {
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if (!strcmp (argv [i], "-p")) {
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if (++i == argc)
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usage (s);
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local_port = htons (atoi (argv [i]));
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debug ("binding to user-specified port %d",
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ntohs (local_port));
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} else if (!strcmp (argv [i], "-pf")) {
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if (++i == argc)
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usage (s);
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path_dhcrelay_pid = argv [i];
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} else if (!strcmp (argv [i], "-d")) {
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no_daemon = 1;
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} else if (!strcmp (argv [i], "-i")) {
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struct interface_info *tmp =
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((struct interface_info *)
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dmalloc (sizeof *tmp, "specified_interface"));
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if (!tmp)
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error ("Insufficient memory to %s %s",
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"record interface", argv [i]);
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if (++i == argc) {
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usage (s);
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}
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memset (tmp, 0, sizeof *tmp);
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strcpy (tmp -> name, argv [i]);
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tmp -> next = interfaces;
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tmp -> flags = INTERFACE_REQUESTED;
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interfaces = tmp;
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} else if (!strcmp (argv [i], "-q")) {
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quiet = 1;
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quiet_interface_discovery = 1;
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} else if (argv [i][0] == '-') {
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usage (s);
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} else {
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struct hostent *he;
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struct in_addr ia, *iap = (struct in_addr *)0;
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if (inet_aton (argv [i], &ia)) {
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iap = &ia;
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} else {
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he = gethostbyname (argv [i]);
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if (!he) {
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warn ("%s: host unknown", argv [i]);
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} else {
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iap = ((struct in_addr *)
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he -> h_addr_list [0]);
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}
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}
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if (iap) {
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sp = (struct server_list *)malloc (sizeof *sp);
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if (!sp)
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error ("no memory for server.\n");
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sp -> next = servers;
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servers = sp;
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memcpy (&sp -> to.sin_addr,
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iap, sizeof *iap);
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}
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}
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}
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if (!quiet) {
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note (message);
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note (copyright);
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note (arr);
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note ("");
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note (contrib);
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note (url);
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note ("");
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}
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/* Default to the DHCP/BOOTP port. */
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if (!local_port) {
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ent = getservbyname ("dhcps", "udp");
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if (!ent)
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local_port = htons (67);
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else
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local_port = ent -> s_port;
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endservent ();
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}
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remote_port = htons (ntohs (local_port) + 1);
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/* We need at least one server. */
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if (!sp) {
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usage (s);
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}
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/* Set up the server sockaddrs. */
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for (sp = servers; sp; sp = sp -> next) {
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sp -> to.sin_port = local_port;
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sp -> to.sin_family = AF_INET;
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#ifdef HAVE_SA_LEN
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sp -> to.sin_len = sizeof sp -> to;
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#endif
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}
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/* Get the current time... */
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GET_TIME (&cur_time);
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/* Discover all the network interfaces. */
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discover_interfaces (DISCOVER_RELAY);
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/* Set up the bootp packet handler... */
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bootp_packet_handler = relay;
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/* Become a daemon... */
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if (!no_daemon) {
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int pid;
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FILE *pf;
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int pfdesc;
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log_perror = 0;
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if ((pid = fork()) < 0)
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error ("can't fork daemon: %m");
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else if (pid)
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exit (0);
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pfdesc = open (path_dhcrelay_pid,
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O_CREAT | O_TRUNC | O_WRONLY, 0644);
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if (pfdesc < 0) {
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warn ("Can't create %s: %m", path_dhcrelay_pid);
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} else {
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pf = fdopen (pfdesc, "w");
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if (!pf)
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warn ("Can't fdopen %s: %m",
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path_dhcrelay_pid);
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else {
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fprintf (pf, "%ld\n", (long)getpid ());
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fclose (pf);
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}
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}
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close (0);
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close (1);
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close (2);
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pid = setsid ();
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}
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/* Start dispatching packets and timeouts... */
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dispatch ();
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/*NOTREACHED*/
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return 0;
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}
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void relay (ip, packet, length, from_port, from, hfrom)
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struct interface_info *ip;
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struct dhcp_packet *packet;
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int length;
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unsigned int from_port;
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struct iaddr from;
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struct hardware *hfrom;
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{
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struct server_list *sp;
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struct sockaddr_in to;
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struct interface_info *out;
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struct hardware hto;
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if (packet -> hlen > sizeof packet -> chaddr) {
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note ("Discarding packet with invalid hlen.");
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return;
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}
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/* If it's a bootreply, forward it to the client. */
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if (packet -> op == BOOTREPLY) {
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if (!(packet -> flags & htons (BOOTP_BROADCAST)) &&
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can_unicast_without_arp ()) {
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to.sin_addr = packet -> yiaddr;
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to.sin_port = remote_port;
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} else {
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to.sin_addr.s_addr = htonl (INADDR_BROADCAST);
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to.sin_port = remote_port;
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}
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to.sin_family = AF_INET;
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#ifdef HAVE_SA_LEN
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to.sin_len = sizeof to;
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#endif
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/* Set up the hardware destination address. */
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hto.hlen = packet -> hlen;
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if (hto.hlen > sizeof hto.haddr)
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hto.hlen = sizeof hto.haddr;
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memcpy (hto.haddr, packet -> chaddr, hto.hlen);
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hto.htype = packet -> htype;
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/* Find the interface that corresponds to the giaddr
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in the packet. */
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for (out = interfaces; out; out = out -> next) {
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if (!memcmp (&out -> primary_address,
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&packet -> giaddr,
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sizeof packet -> giaddr))
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break;
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}
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if (!out) {
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warn ("packet to bogus giaddr %s.\n",
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inet_ntoa (packet -> giaddr));
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return;
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}
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if (!send_packet (out,
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(struct packet *)0,
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packet, length, out -> primary_address,
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&to, &hto) < 0)
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debug ("forwarded BOOTREPLY for %s to %s",
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print_hw_addr (packet -> htype, packet -> hlen,
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packet -> chaddr),
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inet_ntoa (to.sin_addr));
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return;
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}
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/* If giaddr is set on a BOOTREQUEST, ignore it - it's already
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been gatewayed. */
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if (packet -> giaddr.s_addr) {
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note ("ignoring BOOTREQUEST with giaddr of %s\n",
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inet_ntoa (packet -> giaddr));
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return;
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}
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/* Set the giaddr so the server can figure out what net it's
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from and so that we can later forward the response to the
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correct net. */
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packet -> giaddr = ip -> primary_address;
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/* Otherwise, it's a BOOTREQUEST, so forward it to all the
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servers. */
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for (sp = servers; sp; sp = sp -> next) {
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if (!send_packet ((fallback_interface
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? fallback_interface : interfaces),
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(struct packet *)0,
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packet, length, ip -> primary_address,
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&sp -> to, (struct hardware *)0) < 0) {
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debug ("forwarded BOOTREQUEST for %s to %s",
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print_hw_addr (packet -> htype, packet -> hlen,
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packet -> chaddr),
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inet_ntoa (sp -> to.sin_addr));
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}
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}
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}
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static void usage (appname)
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char *appname;
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{
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note (message);
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note (copyright);
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note (arr);
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note ("");
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note (contrib);
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note (url);
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note ("");
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warn ("Usage: %s [-i] [-d] [-i if0] [...-i ifN] [-p <port>]", appname);
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error (" [-pf pidfilename] [server1 [... serverN]]");
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}
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void cleanup ()
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{
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}
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int write_lease (lease)
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struct lease *lease;
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{
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return 1;
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}
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int commit_leases ()
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{
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return 1;
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}
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void bootp (packet)
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struct packet *packet;
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{
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}
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void dhcp (packet)
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struct packet *packet;
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{
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}
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