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/* dhcpd.c
DHCP Server Daemon. */
/*
* Copyright (c) 1995, 1996 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 The Internet Software Consortium.";
static char arr [] = "All rights reserved.";
static char message [] = "Internet Software Consortium DHCPD $Name: $";
#include "dhcpd.h"
static void usage PROTO ((void));
TIME cur_time;
TIME default_lease_time = 43200; /* 12 hours... */
TIME max_lease_time = 86400; /* 24 hours... */
struct tree_cache *global_options [256];
struct iaddr server_identifier;
int server_identifier_matched;
#ifdef USE_FALLBACK
struct interface_info fallback_interface;
#endif
u_int16_t server_port;
int log_priority;
int main (argc, argv, envp)
int argc;
char **argv, **envp;
{
int i;
struct sockaddr_in name;
struct servent *ent;
#ifndef DEBUG
int pid;
#endif
#ifdef SYSLOG_4_2
openlog ("dhcpd", LOG_NDELAY);
log_priority = LOG_DAEMON;
#else
openlog ("dhcpd", LOG_NDELAY, LOG_DAEMON);
#endif
#ifndef NO_PUTENV
/* ensure mktime() calls are processed in UTC */
putenv("TZ=GMT0");
#endif /* !NO_PUTENV */
#ifndef DEBUG
#ifndef SYSLOG_4_2
setlogmask (LOG_UPTO (LOG_INFO));
#endif
/* 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
note (message);
note (copyright);
note (arr);
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",
ntohs (server_port));
} 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 ();
/* Start up the database... */
db_startup ();
/* Discover all the network interfaces and initialize them. */
discover_interfaces ();
/* Write a pid file. */
unlink (_PATH_DHCPD_PID);
if ((i = open (_PATH_DHCPD_PID, O_WRONLY | O_CREAT, 0640)) >= 0) {
char obuf [20];
sprintf (obuf, "%d\n", (int)getpid ());
write (i, obuf, strlen (obuf));
close (i);
}
/* Receive packets and dispatch them... */
dispatch ();
/* Not reached */
return 0;
}
/* Print usage message. */
static void usage ()
{
error ("Usage: dhcpd [-p <port>] [-a <ip-addr>]");
}
void cleanup ()
{
}
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