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Diffstat (limited to 'contrib/isc-dhcp/common/socket.c')
| -rw-r--r-- | contrib/isc-dhcp/common/socket.c | 280 |
1 files changed, 0 insertions, 280 deletions
diff --git a/contrib/isc-dhcp/common/socket.c b/contrib/isc-dhcp/common/socket.c deleted file mode 100644 index b2ae5b4cae97..000000000000 --- a/contrib/isc-dhcp/common/socket.c +++ /dev/null @@ -1,280 +0,0 @@ -/* 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''. - */ - -/* SO_BINDTODEVICE support added by Elliot Poger (poger@leland.stanford.edu). - * This sockopt allows a socket to be bound to a particular interface, - * thus enabling the use of DHCPD on a multihomed host. - * If SO_BINDTODEVICE is defined in your system header files, the use of - * this sockopt will be automatically enabled. - * I have implemented it under Linux; other systems should be doable also. - */ - -#ifndef lint -static char copyright[] = -"$Id: socket.c,v 1.26.2.6 1999/02/03 19:46:04 mellon Exp $ Copyright (c) 1995, 1996, 1997, 1998, 1999 The Internet Software Consortium. All rights reserved.\n"; -#endif /* not lint */ - -#include "dhcpd.h" - -#ifdef USE_SOCKET_FALLBACK -# define USE_SOCKET_SEND -# define if_register_send if_register_fallback -# define send_packet send_fallback -# define if_reinitialize_send if_reinitialize_fallback -#endif - -static int once = 0; - -/* Reinitializes the specified interface after an address change. This - is not required for packet-filter APIs. */ - -#ifdef USE_SOCKET_SEND -void if_reinitialize_send (info) - struct interface_info *info; -{ -#if 0 -#ifndef USE_SOCKET_RECEIVE - once = 0; - close (info -> wfdesc); -#endif - if_register_send (info); -#endif -} -#endif - -#ifdef USE_SOCKET_RECEIVE -void if_reinitialize_receive (info) - struct interface_info *info; -{ -#if 0 - once = 0; - close (info -> rfdesc); - if_register_receive (info); -#endif -} -#endif - -#if defined (USE_SOCKET_SEND) || defined (USE_SOCKET_RECEIVE) -/* Generic interface registration routine... */ -int if_register_socket (info) - struct interface_info *info; -{ - struct sockaddr_in name; - int sock; - int flag; - -#if !defined (SO_BINDTODEVICE) && !defined (USE_FALLBACK) - /* Make sure only one interface is registered. */ - if (once) - error ("The standard socket API can only support %s", - "hosts with a single network interface."); - once = 1; -#endif - - /* 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"); - - /* 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"); - -#if defined (SO_BINDTODEVICE) - /* Bind this socket to this interface. */ - if (info -> ifp && - setsockopt (sock, SOL_SOCKET, SO_BINDTODEVICE, - (char *)(info -> ifp), sizeof *(info -> ifp)) < 0) { - error("setting SO_BINDTODEVICE"); - } -#endif - - return sock; -} -#endif /* USE_SOCKET_SEND || USE_SOCKET_RECEIVE */ - -#ifdef USE_SOCKET_SEND -void if_register_send (info) - struct interface_info *info; -{ -#ifndef USE_SOCKET_RECEIVE - info -> wfdesc = if_register_socket (info); -#else - info -> wfdesc = info -> rfdesc; -#endif - if (!quiet_interface_discovery) - note ("Sending on Socket/%s/%s", - info -> name, - (info -> shared_network ? - info -> shared_network -> name : "unattached")); - -} -#endif /* USE_SOCKET_SEND */ - -#ifdef USE_SOCKET_RECEIVE -void if_register_receive (info) - struct interface_info *info; -{ - /* If we're using the socket API for sending and receiving, - we don't need to register this interface twice. */ - info -> rfdesc = if_register_socket (info); - if (!quiet_interface_discovery) - note ("Listening on Socket/%s/%s", - info -> name, - (info -> shared_network ? - info -> shared_network -> name : "unattached")); -} -#endif /* USE_SOCKET_RECEIVE */ - -#ifdef USE_SOCKET_SEND -ssize_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; -{ - int result; -#ifdef IGNORE_HOSTUNREACH - int retry = 0; - do { -#endif - result = sendto (interface -> wfdesc, (char *)raw, len, 0, - (struct sockaddr *)to, sizeof *to); -#ifdef IGNORE_HOSTUNREACH - } while (to -> sin_addr.s_addr == htonl (INADDR_BROADCAST) && - result < 0 && - (errno == EHOSTUNREACH || - errno == ECONNREFUSED) && - retry++ < 10); -#endif - return result; -} -#endif /* USE_SOCKET_SEND */ - -#ifdef USE_SOCKET_RECEIVE -ssize_t receive_packet (interface, buf, len, from, hfrom) - struct interface_info *interface; - unsigned char *buf; - size_t len; - struct sockaddr_in *from; - struct hardware *hfrom; -{ - int flen = sizeof *from; - int result; - -#ifdef IGNORE_HOSTUNREACH - int retry = 0; - do { -#endif - result = recvfrom (interface -> rfdesc, (char *)buf, len, 0, - (struct sockaddr *)from, &flen); -#ifdef IGNORE_HOSTUNREACH - } while (result < 0 && - (errno == EHOSTUNREACH || - errno == ECONNREFUSED) && - retry++ < 10); -#endif - return result; -} -#endif /* USE_SOCKET_RECEIVE */ - -#ifdef USE_SOCKET_SEND -/* 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"); -} -#endif /* USE_SOCKET_SEND */ - -#if defined (USE_SOCKET_SEND) && !defined (USE_SOCKET_FALLBACK) -int can_unicast_without_arp () -{ - return 0; -} - -/* If we have SO_BINDTODEVICE, set up a fallback interface; otherwise, - do not. */ - -void maybe_setup_fallback () -{ -#if defined (SO_BINDTODEVICE) - struct interface_info *fbi; - fbi = setup_fallback (); - if (fbi) { - fbi -> wfdesc = if_register_socket (fbi); - add_protocol ("fallback", - fbi -> wfdesc, fallback_discard, fbi); - } -#endif -} -#endif /* USE_SOCKET_SEND && !USE_SOCKET_FALLBACK */ |