diff options
Diffstat (limited to 'common/raw.c')
| -rw-r--r-- | common/raw.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/common/raw.c b/common/raw.c new file mode 100644 index 0000000..4730e8e --- /dev/null +++ b/common/raw.c @@ -0,0 +1,139 @@ +/* raw.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) 2004,2007,2009 by Internet Systems Consortium, Inc. ("ISC") + * Copyright (c) 1995-2003 by Internet Software Consortium + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT + * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + * Internet Systems Consortium, Inc. + * 950 Charter Street + * Redwood City, CA 94063 + * <info@isc.org> + * https://www.isc.org/ + * + * This software has been written for Internet Systems Consortium + * by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc. + * To learn more about Internet Systems Consortium, see + * ``https://www.isc.org/''. To learn more about Vixie Enterprises, + * see ``http://www.vix.com''. To learn more about Nominum, Inc., see + * ``http://www.nominum.com''. + */ + +#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) + log_info ("Sending on %s, port %d", + piaddr (info -> address), htons (local_port)); + if ((sock = socket (AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0) + log_fatal ("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) + log_fatal ("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) + log_fatal ("Can't set IP_HDRINCL flag: %m"); + + info -> wfdesc = sock; + if (!quiet_interface_discovery) + log_info ("Sending on Raw/%s%s%s", + info -> name, + (info -> shared_network ? "/" : ""), + (info -> shared_network ? + info -> shared_network -> name : "")); +} + +void if_deregister_send (info) + struct interface_info *info; +{ + close (info -> wfdesc); + info -> wfdesc = -1; + + if (!quiet_interface_discovery) + log_info ("Disabling output on Raw/%s%s%s", + info -> name, + (info -> shared_network ? "/" : ""), + (info -> shared_network ? + info -> shared_network -> name : "")); +} + +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]; + int result; + + /* 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; + + result = writev(interface -> wfdesc, iov, 2); + if (result < 0) + log_error ("send_packet: %m"); + return result; +} +#endif /* USE_SOCKET_SEND */ |