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DHCP Server Daemon
This commit is contained in:
Ted Lemon
256
server/dhcpd.c
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256
server/dhcpd.c
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/* dhcpd.c
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DHCP Server Daemon. */
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/*
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* Copyright (c) 1995 The Internet Software Consortium. 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 copyright[] =
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"@(#) Copyright (c) 1995 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 ((void));
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TIME cur_time;
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u_int32_t *server_addrlist;
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int server_addrcount;
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u_int16_t server_port;
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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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struct in_addr addr;
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int port = 0;
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int i;
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struct sockaddr_in name;
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u_int32_t *addrlist = (u_int32_t *)0;
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int addrcount = 0;
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struct tree *addrtree = (struct tree *)0;
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struct servent *ent;
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int sock;
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int pid;
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int result;
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int flag;
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openlog ("dhcpd", LOG_NDELAY, LOG_DAEMON);
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#ifndef DEBUG
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setlogmask (LOG_UPTO (LOG_INFO));
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/* Become a daemon... */
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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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/* Become session leader and get pid... */
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pid = setsid ();
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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 ();
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server_port = htons (atoi (argv [i]));
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debug ("binding to user-specified port %d\n",
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ntohs (server_port));
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#if 0
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} else if (!strcmp (argv [i], "-a")) {
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if (++i == argc)
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usage ();
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if (inet_aton (argv [i], &addr)) {
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addrtree =
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tree_concat (addrtree,
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tree_const
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((unsigned char *)&addr,
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sizeof addr));
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} else {
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addrtree = tree_concat (addrtree,
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tree_host_lookup
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(argv [i]));
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}
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#endif
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} else
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usage ();
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}
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/* Default to the DHCP/BOOTP port. */
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if (!server_port)
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{
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ent = getservbyname ("dhcp", "udp");
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if (!ent)
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server_port = htons (67);
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else
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server_port = ent -> s_port;
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endservent ();
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}
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/* Get the current time... */
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GET_TIME (&cur_time);
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/* Read the dhcpd.conf file... */
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readconf ();
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#if 0
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/* If addresses were specified on the command line, resolve them;
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otherwise, just get a list of the addresses that are configured
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on this host and listen on all of them. */
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if (addrtree) {
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tree_evaluate ((unsigned char **)&addrlist,
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&addrcount, addrtree);
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addrcount /= 4;
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if (!addrcount)
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error ("Server addresses resolve to nothing.");
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} else {
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/* addrlist = get_interface_list (&addrcount); */
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#endif
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addr.s_addr = 0;
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addrlist = (u_int32_t *)&(addr.s_addr);
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addrcount = 1;
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#if 0
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}
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#endif
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server_addrlist = get_interface_list (&server_addrcount);
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/* Listen on the specified (or default) port on each specified
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(or default) IP address. */
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for (i = 0; i < addrcount; i++) {
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listen_on (server_port, addrlist [i]);
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}
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/* Write a pid file. */
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if ((i = open (_PATH_DHCPD_PID, O_WRONLY | O_CREAT)) >= 0) {
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char obuf [20];
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sprintf (obuf, "%d\n", getpid ());
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write (i, obuf, strlen (obuf));
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close (i);
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}
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/* Receive packets and dispatch them... */
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dispatch ();
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}
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/* Print usage message. */
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static void usage ()
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{
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error ("Usage: dhcpd [-p <port>] [-a <ip-addr>]");
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}
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void cleanup ()
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{
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}
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void do_packet (packbuf, len, from, fromlen, sock)
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unsigned char *packbuf;
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int len;
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struct sockaddr_in *from;
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int fromlen;
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int sock;
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{
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struct packet *tp;
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struct dhcp_packet *tdp;
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if (!(tp = new_packet ("do_packet")))
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return;
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if (!(tdp = new_dhcp_packet ("do_packet"))) {
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free_packet (tp, "do_packet");
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return;
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}
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memcpy (tdp, packbuf, len);
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memset (tp, 0, sizeof *tp);
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tp -> raw = tdp;
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tp -> packet_length = len;
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tp -> client = *from;
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tp -> client_len = fromlen;
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tp -> client_sock = sock;
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parse_options (tp);
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if (tp -> options_valid &&
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tp -> options [DHO_DHCP_MESSAGE_TYPE].data)
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dhcp (tp);
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else
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bootp (tp);
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}
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dump_packet (tp)
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struct packet *tp;
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{
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struct dhcp_packet *tdp = tp -> raw;
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debug ("op = %d htype = %d hlen = %d hops = %d",
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tdp -> op, tdp -> htype, tdp -> hlen, tdp -> hops);
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debug ("xid = %x secs = %d flags = %x",
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tdp -> xid, tdp -> secs, tdp -> flags);
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debug ("ciaddr = %s yiaddr = %s",
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inet_ntoa (tdp -> ciaddr), inet_ntoa (tdp -> yiaddr));
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debug ("siaddr = %s giaddr = %s",
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inet_ntoa (tdp -> siaddr), inet_ntoa (tdp -> giaddr));
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debug ("chaddr = %02.2x:%02.2x:%02.2x:%02.2x:%02.2x:%02.2x",
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((unsigned char *)(tdp -> chaddr)) [0],
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((unsigned char *)(tdp -> chaddr)) [1],
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((unsigned char *)(tdp -> chaddr)) [2],
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((unsigned char *)(tdp -> chaddr)) [3],
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((unsigned char *)(tdp -> chaddr)) [4],
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((unsigned char *)(tdp -> chaddr)) [5]);
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if (tp -> options_valid) {
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int i;
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for (i = 0; i < 256; i++) {
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if (tp -> options [i].data)
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printf (" %s = %s\n",
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dhcp_options [i].name,
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pretty_print_option
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(i, tp -> options [i].data,
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tp -> options [i].len));
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}
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}
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}
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/* Based on the contents of packet, figure out which interface address
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to use from server_addrlist. Currently just picks the first
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interface. */
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u_int32_t pick_interface (packet)
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struct packet *packet;
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{
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if (server_addrlist)
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return server_addrlist [0];
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return 0;
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}
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