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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 objcopyright[] =
"$Id: dhcpd.c,v 1.26 1996/08/27 09:44:54 mellon Exp $ Copyright 1995, 1996 The Internet Software Consortium.";
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;
struct group root_group;
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, status;
struct sockaddr_in name;
struct servent *ent;
int pidfilewritten = 0;
#ifndef DEBUG
int pid;
char pbuf [20];
int daemon = 1;
int log_perror = 0;
#endif
/* Initially, log errors to stderr as well as to syslogd. */
#ifdef SYSLOG_4_2
openlog ("dhcpd", LOG_NDELAY | LOG_PERROR);
log_priority = DHCPD_LOG_FACILITY;
#else
openlog ("dhcpd", LOG_NDELAY | LOG_PERROR, DHCPD_LOG_FACILITY);
#endif
#ifndef DEBUG
#ifndef SYSLOG_4_2
setlogmask (LOG_UPTO (LOG_INFO));
#endif
#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 if (!strcmp (argv [i], "-f")) {
#ifndef DEBUG
daemon = 0;
#endif
} else if (!strcmp (argv [i], "-d")) {
#ifndef DEBUG
daemon = 0;
log_perror = 1;
#endif
} else if (argv [i][0] == '-') {
usage ();
} 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);
strcpy (tmp -> name, argv [i]);
tmp -> next = interfaces;
tmp -> flags = INTERFACE_REQUESTED;
interfaces = tmp;
}
}
/* If the user didn't ask for debug mode, close the log and
reopen it without the LOG_STDERR flag. */
#ifndef DEBUG
if (!log_perror) {
closelog ();
#ifdef SYSLOG_4_2
openlog ("dhcpd", LOG_NDELAY);
log_priority = DHCPD_LOG_FACILITY;
#else
openlog ("dhcpd", LOG_NDELAY, DHCPD_LOG_FACILITY);
#endif
#ifndef SYSLOG_4_2
setlogmask (LOG_UPTO (LOG_INFO));
#endif
}
if (daemon) {
/* 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 ();
}
/* Read previous pid file. */
if ((i = open (_PATH_DHCPD_PID, O_RDONLY)) >= 0) {
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 && kill (pid, 0) < 0) {
unlink (_PATH_DHCPD_PID);
if ((i = open (_PATH_DHCPD_PID,
O_WRONLY | O_CREAT, 0640)) >= 0) {
sprintf (pbuf, "%d\n", (int)getpid ());
write (i, pbuf, strlen (pbuf));
close (i);
pidfilewritten = 1;
}
}
}
#endif /* !DEBUG */
/* 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 ();
#ifndef DEBUG
/* 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)) >= 0) {
sprintf (pbuf, "%d\n", (int)getpid ());
write (i, pbuf, strlen (pbuf));
close (i);
pidfilewritten = 1;
}
}
#endif /* !DEBUG */
/* Receive packets and dispatch them... */
dispatch ();
/* Not reached */
return 0;
}
/* Print usage message. */
static void usage ()
{
error ("Usage: dhcpd [-p <port>] [-f] [if0 [...ifN]]");
}
void cleanup ()
{
}
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