154 lines
5.2 KiB
C
154 lines
5.2 KiB
C
/* socket.c
|
|
|
|
BSD raw socket interface code... */
|
|
|
|
/* XXX
|
|
|
|
It's not clear how this should work, and that lack of clarity is
|
|
terribly detrimental to the NetBSD 1.1 kernel - it crashes and
|
|
burns.
|
|
|
|
Using raw sockets ought to be a big win over using BPF or something
|
|
like it, because you don't need to deal with the complexities of
|
|
the physical layer, but it appears not to be possible with existing
|
|
raw socket implementations. This may be worth revisiting in the
|
|
future. For now, this code can probably be considered a curiosity.
|
|
Sigh. */
|
|
|
|
/*
|
|
* Copyright (c) 1995-2000 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 in cooperation with Vixie Enterprises and Nominum, Inc.
|
|
* To learn more about the Internet Software Consortium, see
|
|
* ``http://www.isc.org/''. To learn more about Vixie Enterprises,
|
|
* see ``http://www.vix.com''. To learn more about Nominum, Inc., see
|
|
* ``http://www.nominum.com''.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static char copyright[] =
|
|
"$Id: raw.c,v 1.17 2000/03/17 03:59:01 mellon Exp $ Copyright (c) 1995, 1996 The Internet Software Consortium. All rights reserved.\n";
|
|
#endif /* not lint */
|
|
|
|
#include "dhcpd.h"
|
|
|
|
#if defined (USE_RAW_SEND)
|
|
#include <sys/uio.h>
|
|
|
|
/* Generic interface registration routine... */
|
|
void if_register_send (info)
|
|
struct interface_info *info;
|
|
{
|
|
struct sockaddr_in name;
|
|
int sock;
|
|
struct socklist *tmp;
|
|
int flag;
|
|
|
|
/* Set up the address we're going to connect to. */
|
|
name.sin_family = AF_INET;
|
|
name.sin_port = local_port;
|
|
name.sin_addr.s_addr = htonl (INADDR_BROADCAST);
|
|
memset (name.sin_zero, 0, sizeof (name.sin_zero));
|
|
|
|
/* List addresses on which we're listening. */
|
|
if (!quiet_interface_discovery)
|
|
log_info ("Sending on %s, port %d",
|
|
piaddr (info -> address), htons (local_port));
|
|
if ((sock = socket (AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0)
|
|
log_fatal ("Can't create dhcp socket: %m");
|
|
|
|
/* Set the BROADCAST option so that we can broadcast DHCP responses. */
|
|
flag = 1;
|
|
if (setsockopt (sock, SOL_SOCKET, SO_BROADCAST,
|
|
&flag, sizeof flag) < 0)
|
|
log_fatal ("Can't set SO_BROADCAST option on dhcp socket: %m");
|
|
|
|
/* Set the IP_HDRINCL flag so that we can supply our own IP
|
|
headers... */
|
|
if (setsockopt (sock, IPPROTO_IP, IP_HDRINCL, &flag, sizeof flag) < 0)
|
|
log_fatal ("Can't set IP_HDRINCL flag: %m");
|
|
|
|
info -> wfdesc = sock;
|
|
if (!quiet_interface_discovery)
|
|
log_info ("Sending on Raw/%s%s%s",
|
|
info -> name,
|
|
(info -> shared_network ? "/" : ""),
|
|
(info -> shared_network ?
|
|
info -> shared_network -> name : ""));
|
|
}
|
|
|
|
void if_deregister_send (info)
|
|
struct interface_info *info;
|
|
{
|
|
close (info -> wfdesc);
|
|
info -> wfdesc = -1;
|
|
|
|
if (!quiet_interface_discovery)
|
|
log_info ("Disabling output on Raw/%s%s%s",
|
|
info -> name,
|
|
(info -> shared_network ? "/" : ""),
|
|
(info -> shared_network ?
|
|
info -> shared_network -> name : ""));
|
|
}
|
|
|
|
size_t send_packet (interface, packet, raw, len, from, to, hto)
|
|
struct interface_info *interface;
|
|
struct packet *packet;
|
|
struct dhcp_packet *raw;
|
|
size_t len;
|
|
struct in_addr from;
|
|
struct sockaddr_in *to;
|
|
struct hardware *hto;
|
|
{
|
|
unsigned char buf [256];
|
|
int bufp = 0;
|
|
struct iovec iov [2];
|
|
int result;
|
|
|
|
/* Assemble the headers... */
|
|
assemble_udp_ip_header (interface, buf, &bufp, from.s_addr,
|
|
to -> sin_addr.s_addr, to -> sin_port,
|
|
(unsigned char *)raw, len);
|
|
|
|
/* Fire it off */
|
|
iov [0].iov_base = (char *)buf;
|
|
iov [0].iov_len = bufp;
|
|
iov [1].iov_base = (char *)raw;
|
|
iov [1].iov_len = len;
|
|
|
|
result = writev(interface -> wfdesc, iov, 2);
|
|
if (result < 0)
|
|
log_error ("send_packet: %m");
|
|
return result;
|
|
}
|
|
#endif /* USE_SOCKET_SEND */
|