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/* socket.c
BSD socket interface code... */
/*
* Copyright (c) 1995, 1996, 1997, 1998, 1999
* 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''.
*/
#include "dhcpd.h"
/* Generic interface registration routine... */
int if_register_socket (info)
struct interface_info *info;
{
struct sockaddr_in name;
int sock;
int flag;
/* Set up the address we're going to bind to. */
name.sin_family = AF_INET;
name.sin_port = local_port;
name.sin_addr.s_addr = INADDR_ANY;
memset (name.sin_zero, 0, sizeof (name.sin_zero));
/* Make a socket... */
if ((sock = socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
error ("Can't create dhcp socket: %m");
/* Set the REUSEADDR option so that we don't fail to start if
we're being restarted. */
flag = 1;
if (setsockopt (sock, SOL_SOCKET, SO_REUSEADDR,
(char *)&flag, sizeof flag) < 0)
error ("Can't set SO_REUSEADDR option on dhcp socket: %m");
flag = 1;
if (setsockopt (sock, SOL_SOCKET, SO_REUSEPORT,
(char *)&flag, sizeof flag) < 0)
error ("Can't set SO_REUSEPORT option on dhcp socket: %m");
/* Set the BROADCAST option so that we can broadcast DHCP responses. */
if (setsockopt (sock, SOL_SOCKET, SO_BROADCAST,
(char *)&flag, sizeof flag) < 0)
error ("Can't set SO_BROADCAST option on dhcp socket: %m");
/* Bind the socket to this interface's IP address. */
if (bind (sock, (struct sockaddr *)&name, sizeof name) < 0)
error ("Can't bind to dhcp address: %m");
flag = IPSEC_LEVEL_BYPASS;
if (setsockopt (sock, IPPROTO_IP, IP_AUTH_LEVEL,
(char *)&flag, sizeof flag) == -1)
if (errno != EOPNOTSUPP)
error ("Can't bypass auth IPsec on dhcp socket: %m");
if (setsockopt (sock, IPPROTO_IP, IP_ESP_TRANS_LEVEL,
(char *)&flag, sizeof flag) == -1)
if (errno != EOPNOTSUPP)
error ("Can't bypass ESP transport on dhcp socket: %m");
if (setsockopt (sock, IPPROTO_IP, IP_ESP_NETWORK_LEVEL,
(char *)&flag, sizeof flag) == -1)
if (errno != EOPNOTSUPP)
error ("Can't bypass ESP network on dhcp socket: %m");
return sock;
}
void if_register_fallback (info)
struct interface_info *info;
{
info -> wfdesc = if_register_socket (info);
if (!quiet_interface_discovery)
note ("Sending on Socket/%s%s%s",
info -> name,
(info -> shared_network ? "/" : ""),
(info -> shared_network ?
info -> shared_network -> name : ""));
}
ssize_t send_fallback (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;
{
int result;
result = sendto (interface -> wfdesc, (char *)raw, len, 0,
(struct sockaddr *)to, sizeof *to);
if (result == -1) {
warn ("send_fallback: %m");
if (errno == ENETUNREACH)
warn ("send_fallback: please consult README file %s",
"regarding broadcast address.");
}
return result;
}
/* This just reads in a packet and silently discards it. */
void fallback_discard (protocol)
struct protocol *protocol;
{
char buf [1540];
struct sockaddr_in from;
int flen = sizeof from;
int status;
struct interface_info *interface = protocol -> local;
status = recvfrom (interface -> wfdesc, buf, sizeof buf, 0,
(struct sockaddr *)&from, &flen);
if (status == 0)
warn ("fallback_discard: %m");
}
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