154 lines
5.0 KiB
C
154 lines
5.0 KiB
C
/* socket.c
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BSD raw socket interface code... */
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/* XXX
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It's not clear how this should work, and that lack of clarity is
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terribly detrimental to the NetBSD 1.1 kernel - it crashes and
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burns.
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Using raw sockets ought to be a big win over using BPF or something
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like it, because you don't need to deal with the complexities of
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the physical layer, but it appears not to be possible with existing
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raw socket implementations. This may be worth revisiting in the
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future. For now, this code can probably be considered a curiosity.
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Sigh. */
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/*
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* Copyright (c) 1995, 1996, 1997, 1999 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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#ifndef lint
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static char copyright[] =
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"$Id: raw.c,v 1.1.1.4 1999/04/09 17:52:06 mellon Exp $ Copyright (c) 1995, 1996, 1997, 1999 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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#if defined (USE_RAW_SEND)
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#include <sys/uio.h>
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/* Generic interface registration routine... */
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void if_register_send (info)
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struct interface_info *info;
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{
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struct sockaddr_in name;
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int sock;
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struct socklist *tmp;
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int flag;
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/* Set up the address we're going to connect to. */
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name.sin_family = AF_INET;
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name.sin_port = local_port;
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name.sin_addr.s_addr = htonl (INADDR_BROADCAST);
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memset (name.sin_zero, 0, sizeof (name.sin_zero));
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/* List addresses on which we're listening. */
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if (!quiet_interface_discovery)
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note ("Sending on %s, port %d",
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piaddr (info -> address), htons (local_port));
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if ((sock = socket (AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0)
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error ("Can't create dhcp socket: %m");
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/* Set the BROADCAST option so that we can broadcast DHCP responses. */
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flag = 1;
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if (setsockopt (sock, SOL_SOCKET, SO_BROADCAST,
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&flag, sizeof flag) < 0)
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error ("Can't set SO_BROADCAST option on dhcp socket: %m");
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/* Set the IP_HDRINCL flag so that we can supply our own IP
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headers... */
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if (setsockopt (sock, IPPROTO_IP, IP_HDRINCL, &flag, sizeof flag) < 0)
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error ("Can't set IP_HDRINCL flag: %m");
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info -> wfdesc = sock;
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if (!quiet_interface_discovery)
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note ("Sending on Raw/%s%s%s",
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info -> name,
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(info -> shared_network ? "/" : ""),
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(info -> shared_network ?
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info -> shared_network -> name : ""));
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}
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ssize_t send_packet (interface, packet, raw, len, from, to, hto)
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struct interface_info *interface;
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struct packet *packet;
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struct dhcp_packet *raw;
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size_t len;
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struct in_addr from;
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struct sockaddr_in *to;
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struct hardware *hto;
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{
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unsigned char buf [1500];
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int bufp = 0;
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struct iovec iov [2];
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int result;
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/* Assemble the headers... */
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assemble_udp_ip_header (interface, buf, &bufp, from.s_addr,
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to -> sin_addr.s_addr, to -> sin_port,
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(unsigned char *)raw, len);
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if (len + bufp > sizeof buf) {
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warn ("send_packet: packet too large (%s)", len + bufp);
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return;
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}
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memcpy (buf + bufp, raw, len);
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bufp += len;
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result = sendto (interface -> wfdesc, (char *)buf, bufp, 0,
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(struct sockaddr *)to, sizeof *to);
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if (result < 0)
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warn ("send_packet: %m");
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return result;
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}
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int can_unicast_without_arp ()
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{
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return 1;
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}
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void maybe_setup_fallback ()
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{
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}
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void if_reinitialize_send (info)
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struct interface_info *info;
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{
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}
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#endif /* USE_RAW_SEND */
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