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Moved to relay/
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Ted Lemon
parent
034aa896ce
commit
6e5382c00d
123
dhcrelay.8
123
dhcrelay.8
@ -1,123 +0,0 @@
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.\" dhcrelay.8
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.\"
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.\" Copyright (c) 1997 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.isc.org/isc''. To learn more about Vixie
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.\" Enterprises, see ``http://www.vix.com''.
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.TH dhcrelay 8
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.SH NAME
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dhcpd - Dynamic Host Configuration Protocol Relay Agent
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.SH SYNOPSIS
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.B dhcrelay
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[
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.B -p
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.I port
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]
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[
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.B -d
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]
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[
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.B -i
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.I if0
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[
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.B ...
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.B -i
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.I ifN
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]
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]
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.I server0
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[
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.I ...serverN
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]
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.SH DESCRIPTION
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The Internet Software Consortium DHCP Relay Agent, dhcrelay, provides a
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means for relaying DHCP and BOOTP requests from a subnet to which
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no DHCP server is directly to one or more DHCP servers on other
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subnets.
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.SH OPERATION
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.PP
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The DHCP Relay Agent listens for DHCP requests on all interfaces
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attached to a host, or only on those interfaces specified on the
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command line with the
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.I -i
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flag. When a query is received, it forwards it to the list of DHCP
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servers specified on the command line. When a reply is received, it
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is broadcast or unicast on the network from whence the original
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request came.
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.PP
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It is possible to specify a set of interfaces on which dhcrelay will
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listen, so that if dhcrelay is connected through one interface to a
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network on which there is no DHCP server, but is connected on another
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interface to a network on which there is a DHCP server, it will not
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relay DHCP and BOOTP requests from the network on which the server
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exists to that server. This is an imperfect solution.
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.SH COMMAND LINE
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.PP
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The names of the network interfaces that dhcrelay should attempt to
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configure may be specified on the command line using the
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.I -i
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option. If no interface names
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are specified on the command line dhcrelay will identify all network
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interfaces, elimininating non-broadcast interfaces if possible, and
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attempt to configure each interface.
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.PP
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If dhcrelay should listen and transmit on a port other than the
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standard (port 67), the
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.B -p
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flag may used. It should be followed by the udp port number that
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dhcrelay should use. This is mostly useful for debugging purposes.
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.PP
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Dhclient will normally run in the foreground until it has configured
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an interface, and then will revert to running in the background.
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To run force dhcrelay to always run as a foreground process, the
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.B -d
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flag should be specified. This is useful when running dhcrelay under
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a debugger, or when running it out of inittab on System V systems.
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.PP
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The name of at least one DHCP server to which DHCP and BOOTP requests
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should be relayed must be specified on the command line.
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.PP
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.SH SEE ALSO
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dhclient(8), dhcpd(8), dhcrelay.conf(5), dhcrelay.leases(5)
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.SH AUTHOR
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.B dhcrelay(8)
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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
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.B http://www.vix.com/isc.
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To learn more about Vixie
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Enterprises, see
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.B http://www.vix.com.
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.PP
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300
dhcrelay.c
300
dhcrelay.c
@ -1,300 +0,0 @@
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/* dhcrelay.c
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DHCP/BOOTP Relay Agent. */
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/*
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* Copyright (c) 1997 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 copyright[] =
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"$Id: dhcrelay.c,v 1.2 1997/02/22 12:28:26 mellon Exp $ Copyright (c) 1997 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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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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#ifdef USE_FALLBACK
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struct interface_info fallback_interface;
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#endif
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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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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;
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int no_daemon;
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#ifdef SYSLOG_4_2
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openlog ("dhcrelay", LOG_NDELAY);
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log_priority = LOG_DAEMON;
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#else
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openlog ("dhcrelay", LOG_NDELAY, LOG_DAEMON);
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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 ();
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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], "-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 ();
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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 (argv [i][0] == '-') {
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usage ();
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} else {
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struct hostent *he;
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he = gethostbyname (argv [i]);
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if (!he) {
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herror (argv [i]);
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} else {
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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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he -> h_addr_list [0], he -> h_length);
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}
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}
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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 ();
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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 = remote_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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/* Start dispatching packets and timeouts... */
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dispatch (0);
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/*NOTREACHED*/
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return 0;
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}
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void relay (ip, packet, length)
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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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{
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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 it's a bootreply, forward it to the client. */
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if (packet -> op == BOOTREPLY) {
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#ifndef USE_FALLBACK
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if (!packet -> flags & htons (BOOTP_BROADCAST)) {
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to.sin_addr = packet -> raw -> ciaddr;
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to.sin_port = remote_port;
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} else
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#endif
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{
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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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memcpy (hto.haddr, packet -> chaddr,
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(packet -> hlen > sizeof hto.haddr
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? sizeof hto.haddr
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: packet -> 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 ("sendpkt: %m");
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else
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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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|
|
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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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|
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packet -> giaddr = ip -> primary_address;
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|
|
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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 (
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|
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#ifdef USE_FALLBACK
|
|
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send_fallback (&fallback_interface,
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|
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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)
|
|
||||||
#else
|
|
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send_packet (interfaces,
|
|
||||||
(struct packet *)0,
|
|
||||||
packet, length, ip -> primary_address,
|
|
||||||
&sp -> to, (struct hardware *)0)
|
|
||||||
#endif
|
|
||||||
< 0) {
|
|
||||||
debug ("send_packet: %m");
|
|
||||||
} else {
|
|
||||||
debug ("forwarded BOOTREQUEST for %s to %s",
|
|
||||||
print_hw_addr (packet -> htype, packet -> hlen,
|
|
||||||
packet -> chaddr),
|
|
||||||
inet_ntoa (sp -> to.sin_addr));
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
}
|
|
||||||
|
|
||||||
static void usage ()
|
|
||||||
{
|
|
||||||
error ("Usage: dhcrelay [-c] [-p <port>] [server1 [... serverN]]");
|
|
||||||
}
|
|
||||||
|
|
||||||
void cleanup ()
|
|
||||||
{
|
|
||||||
}
|
|
||||||
|
|
||||||
int write_lease (lease)
|
|
||||||
struct lease *lease;
|
|
||||||
{
|
|
||||||
return 1;
|
|
||||||
}
|
|
||||||
|
|
||||||
int commit_leases ()
|
|
||||||
{
|
|
||||||
return 1;
|
|
||||||
}
|
|
||||||
|
|
||||||
void bootp (packet)
|
|
||||||
struct packet *packet;
|
|
||||||
{
|
|
||||||
}
|
|
||||||
|
|
||||||
void dhcp (packet)
|
|
||||||
struct packet *packet;
|
|
||||||
{
|
|
||||||
}
|
|
||||||
Loading…
x
Reference in New Issue
Block a user