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Diffstat (limited to 'usr.sbin/dhcp/common/raw.c')
| -rw-r--r-- | usr.sbin/dhcp/common/raw.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/usr.sbin/dhcp/common/raw.c b/usr.sbin/dhcp/common/raw.c new file mode 100644 index 00000000000..38c53121500 --- /dev/null +++ b/usr.sbin/dhcp/common/raw.c @@ -0,0 +1,132 @@ +/* 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, 1996 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''. */ + +#ifndef lint +static char copyright[] = +"$Id: raw.c,v 1.1 1998/08/18 03:43:27 deraadt 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) + note ("Sending on %s, port %d", + piaddr (info -> address), htons (local_port)); + if ((sock = socket (AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0) + error ("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) + error ("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) + error ("Can't set IP_HDRINCL flag: %m"); + + info -> wfdesc = sock; + if (!quiet_interface_discovery) + note ("Sending on Raw/%s/%s", + info -> name, + (info -> shared_network ? + info -> shared_network -> name : "unattached")); +} + +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]; + + /* 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; + + return writev(interface -> wfdesc, iov, 2); +} +#endif /* USE_SOCKET_SEND */ |