Annotation of embedaddon/dhcp/common/raw.c, revision 1.1
1.1 ! misho 1: /* raw.c
! 2:
! 3: BSD raw socket interface code... */
! 4:
! 5: /* XXX
! 6:
! 7: It's not clear how this should work, and that lack of clarity is
! 8: terribly detrimental to the NetBSD 1.1 kernel - it crashes and
! 9: burns.
! 10:
! 11: Using raw sockets ought to be a big win over using BPF or something
! 12: like it, because you don't need to deal with the complexities of
! 13: the physical layer, but it appears not to be possible with existing
! 14: raw socket implementations. This may be worth revisiting in the
! 15: future. For now, this code can probably be considered a curiosity.
! 16: Sigh. */
! 17:
! 18: /*
! 19: * Copyright (c) 2004,2007,2009 by Internet Systems Consortium, Inc. ("ISC")
! 20: * Copyright (c) 1995-2003 by Internet Software Consortium
! 21: *
! 22: * Permission to use, copy, modify, and distribute this software for any
! 23: * purpose with or without fee is hereby granted, provided that the above
! 24: * copyright notice and this permission notice appear in all copies.
! 25: *
! 26: * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
! 27: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
! 28: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
! 29: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
! 30: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
! 31: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
! 32: * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
! 33: *
! 34: * Internet Systems Consortium, Inc.
! 35: * 950 Charter Street
! 36: * Redwood City, CA 94063
! 37: * <info@isc.org>
! 38: * https://www.isc.org/
! 39: *
! 40: * This software has been written for Internet Systems Consortium
! 41: * by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
! 42: * To learn more about Internet Systems Consortium, see
! 43: * ``https://www.isc.org/''. To learn more about Vixie Enterprises,
! 44: * see ``http://www.vix.com''. To learn more about Nominum, Inc., see
! 45: * ``http://www.nominum.com''.
! 46: */
! 47:
! 48: #include "dhcpd.h"
! 49:
! 50: #if defined (USE_RAW_SEND)
! 51: #include <sys/uio.h>
! 52:
! 53: /* Generic interface registration routine... */
! 54: void if_register_send (info)
! 55: struct interface_info *info;
! 56: {
! 57: struct sockaddr_in name;
! 58: int sock;
! 59: struct socklist *tmp;
! 60: int flag;
! 61:
! 62: /* Set up the address we're going to connect to. */
! 63: name.sin_family = AF_INET;
! 64: name.sin_port = local_port;
! 65: name.sin_addr.s_addr = htonl (INADDR_BROADCAST);
! 66: memset (name.sin_zero, 0, sizeof (name.sin_zero));
! 67:
! 68: /* List addresses on which we're listening. */
! 69: if (!quiet_interface_discovery)
! 70: log_info ("Sending on %s, port %d",
! 71: piaddr (info -> address), htons (local_port));
! 72: if ((sock = socket (AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0)
! 73: log_fatal ("Can't create dhcp socket: %m");
! 74:
! 75: /* Set the BROADCAST option so that we can broadcast DHCP responses. */
! 76: flag = 1;
! 77: if (setsockopt (sock, SOL_SOCKET, SO_BROADCAST,
! 78: &flag, sizeof flag) < 0)
! 79: log_fatal ("Can't set SO_BROADCAST option on dhcp socket: %m");
! 80:
! 81: /* Set the IP_HDRINCL flag so that we can supply our own IP
! 82: headers... */
! 83: if (setsockopt (sock, IPPROTO_IP, IP_HDRINCL, &flag, sizeof flag) < 0)
! 84: log_fatal ("Can't set IP_HDRINCL flag: %m");
! 85:
! 86: info -> wfdesc = sock;
! 87: if (!quiet_interface_discovery)
! 88: log_info ("Sending on Raw/%s%s%s",
! 89: info -> name,
! 90: (info -> shared_network ? "/" : ""),
! 91: (info -> shared_network ?
! 92: info -> shared_network -> name : ""));
! 93: }
! 94:
! 95: void if_deregister_send (info)
! 96: struct interface_info *info;
! 97: {
! 98: close (info -> wfdesc);
! 99: info -> wfdesc = -1;
! 100:
! 101: if (!quiet_interface_discovery)
! 102: log_info ("Disabling output on Raw/%s%s%s",
! 103: info -> name,
! 104: (info -> shared_network ? "/" : ""),
! 105: (info -> shared_network ?
! 106: info -> shared_network -> name : ""));
! 107: }
! 108:
! 109: size_t send_packet (interface, packet, raw, len, from, to, hto)
! 110: struct interface_info *interface;
! 111: struct packet *packet;
! 112: struct dhcp_packet *raw;
! 113: size_t len;
! 114: struct in_addr from;
! 115: struct sockaddr_in *to;
! 116: struct hardware *hto;
! 117: {
! 118: unsigned char buf [256];
! 119: int bufp = 0;
! 120: struct iovec iov [2];
! 121: int result;
! 122:
! 123: /* Assemble the headers... */
! 124: assemble_udp_ip_header (interface, buf, &bufp, from.s_addr,
! 125: to -> sin_addr.s_addr, to -> sin_port,
! 126: (unsigned char *)raw, len);
! 127:
! 128: /* Fire it off */
! 129: iov [0].iov_base = (char *)buf;
! 130: iov [0].iov_len = bufp;
! 131: iov [1].iov_base = (char *)raw;
! 132: iov [1].iov_len = len;
! 133:
! 134: result = writev(interface -> wfdesc, iov, 2);
! 135: if (result < 0)
! 136: log_error ("send_packet: %m");
! 137: return result;
! 138: }
! 139: #endif /* USE_SOCKET_SEND */
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