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/* dhcpd.c
DHCP Server Daemon. */
/*
* Copyright (c) 1995 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''.
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1995 The Internet Software Consortium. All rights reserved.\n";
#endif /* not lint */
#include "dhcpd.h"
static void usage PROTO ((void));
TIME cur_time;
u_int32_t *server_addrlist;
int server_addrcount;
u_int16_t server_port;
int main (argc, argv, envp)
int argc;
char **argv, **envp;
{
struct in_addr addr;
int port = 0;
int i;
struct sockaddr_in name;
u_int32_t *addrlist = (u_int32_t *)0;
int addrcount = 0;
struct tree *addrtree = (struct tree *)0;
struct servent *ent;
int sock;
int pid;
int result;
int flag;
openlog ("dhcpd", LOG_NDELAY, LOG_DAEMON);
#ifndef DEBUG
setlogmask (LOG_UPTO (LOG_INFO));
/* Become a daemon... */
if ((pid = fork ()) < 0)
error ("Can't fork daemon: %m");
else if (pid)
exit (0);
/* Become session leader and get pid... */
pid = setsid ();
#endif
for (i = 1; i < argc; i++) {
if (!strcmp (argv [i], "-p")) {
if (++i == argc)
usage ();
server_port = htons (atoi (argv [i]));
debug ("binding to user-specified port %d\n",
ntohs (server_port));
#if 0
} else if (!strcmp (argv [i], "-a")) {
if (++i == argc)
usage ();
if (inet_aton (argv [i], &addr)) {
addrtree =
tree_concat (addrtree,
tree_const
((unsigned char *)&addr,
sizeof addr));
} else {
addrtree = tree_concat (addrtree,
tree_host_lookup
(argv [i]));
}
#endif
} else
usage ();
}
/* Default to the DHCP/BOOTP port. */
if (!server_port)
{
ent = getservbyname ("dhcp", "udp");
if (!ent)
server_port = htons (67);
else
server_port = ent -> s_port;
endservent ();
}
/* Get the current time... */
GET_TIME (&cur_time);
/* Read the dhcpd.conf file... */
readconf ();
#if 0
/* If addresses were specified on the command line, resolve them;
otherwise, just get a list of the addresses that are configured
on this host and listen on all of them. */
if (addrtree) {
tree_evaluate ((unsigned char **)&addrlist,
&addrcount, addrtree);
addrcount /= 4;
if (!addrcount)
error ("Server addresses resolve to nothing.");
} else {
/* addrlist = get_interface_list (&addrcount); */
#endif
addr.s_addr = 0;
addrlist = (u_int32_t *)&(addr.s_addr);
addrcount = 1;
#if 0
}
#endif
server_addrlist = get_interface_list (&server_addrcount);
/* Listen on the specified (or default) port on each specified
(or default) IP address. */
for (i = 0; i < addrcount; i++) {
listen_on (server_port, addrlist [i]);
}
/* Write a pid file. */
if ((i = open (_PATH_DHCPD_PID, O_WRONLY | O_CREAT)) >= 0) {
char obuf [20];
sprintf (obuf, "%d\n", getpid ());
write (i, obuf, strlen (obuf));
close (i);
}
/* Receive packets and dispatch them... */
dispatch ();
}
/* Print usage message. */
static void usage ()
{
error ("Usage: dhcpd [-p <port>] [-a <ip-addr>]");
}
void cleanup ()
{
}
void do_packet (packbuf, len, from, fromlen, sock)
unsigned char *packbuf;
int len;
struct sockaddr_in *from;
int fromlen;
int sock;
{
struct packet *tp;
struct dhcp_packet *tdp;
if (!(tp = new_packet ("do_packet")))
return;
if (!(tdp = new_dhcp_packet ("do_packet"))) {
free_packet (tp, "do_packet");
return;
}
memcpy (tdp, packbuf, len);
memset (tp, 0, sizeof *tp);
tp -> raw = tdp;
tp -> packet_length = len;
tp -> client = *from;
tp -> client_len = fromlen;
tp -> client_sock = sock;
parse_options (tp);
if (tp -> options_valid &&
tp -> options [DHO_DHCP_MESSAGE_TYPE].data)
dhcp (tp);
else
bootp (tp);
}
dump_packet (tp)
struct packet *tp;
{
struct dhcp_packet *tdp = tp -> raw;
debug ("op = %d htype = %d hlen = %d hops = %d",
tdp -> op, tdp -> htype, tdp -> hlen, tdp -> hops);
debug ("xid = %x secs = %d flags = %x",
tdp -> xid, tdp -> secs, tdp -> flags);
debug ("ciaddr = %s yiaddr = %s",
inet_ntoa (tdp -> ciaddr), inet_ntoa (tdp -> yiaddr));
debug ("siaddr = %s giaddr = %s",
inet_ntoa (tdp -> siaddr), inet_ntoa (tdp -> giaddr));
debug ("chaddr = %02.2x:%02.2x:%02.2x:%02.2x:%02.2x:%02.2x",
((unsigned char *)(tdp -> chaddr)) [0],
((unsigned char *)(tdp -> chaddr)) [1],
((unsigned char *)(tdp -> chaddr)) [2],
((unsigned char *)(tdp -> chaddr)) [3],
((unsigned char *)(tdp -> chaddr)) [4],
((unsigned char *)(tdp -> chaddr)) [5]);
if (tp -> options_valid) {
int i;
for (i = 0; i < 256; i++) {
if (tp -> options [i].data)
printf (" %s = %s\n",
dhcp_options [i].name,
pretty_print_option
(i, tp -> options [i].data,
tp -> options [i].len));
}
}
}
/* Based on the contents of packet, figure out which interface address
to use from server_addrlist. Currently just picks the first
interface. */
u_int32_t pick_interface (packet)
struct packet *packet;
{
if (server_addrlist)
return server_addrlist [0];
return 0;
}
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