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Diffstat (limited to 'common/nit.c')
| -rw-r--r-- | common/nit.c | 326 |
1 files changed, 0 insertions, 326 deletions
diff --git a/common/nit.c b/common/nit.c deleted file mode 100644 index 5344c74c..00000000 --- a/common/nit.c +++ /dev/null @@ -1,326 +0,0 @@ -/* nit.c - - Network Interface Tap (NIT) network interface code, by Ted Lemon - with one crucial tidbit of help from Stu Grossmen. */ - -/* - * Copyright (c) 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: nit.c,v 1.7 1996/08/27 09:52:09 mellon Exp $ Copyright (c) 1996 The Internet Software Consortium. All rights reserved.\n"; -#endif /* not lint */ - -#include "dhcpd.h" -#if defined (USE_NIT_SEND) || defined (USE_NIT_RECEIVE) -#include <sys/ioctl.h> -#include <sys/uio.h> - -#include <sys/time.h> -#include <net/nit.h> -#include <net/nit_if.h> -#include <net/nit_pf.h> -#include <net/nit_buf.h> -#include <sys/stropts.h> -#include <net/packetfilt.h> - -#include <netinet/in_systm.h> -#include "includes/netinet/ip.h" -#include "includes/netinet/udp.h" -#include "includes/netinet/if_ether.h" - -/* Called by get_interface_list for each interface that's discovered. - Opens a packet filter for each interface and adds it to the select - mask. */ - -int if_register_nit (info, ifp) - struct interface_info *info; - struct ifreq *ifp; -{ - int sock; - char filename[50]; - struct ifreq ifr; - struct strioctl sio; - - /* Open a NIT device */ - sock = open ("/dev/nit", O_RDWR); - if (sock < 0) - error ("Can't open NIT device: %m"); - - /* Set the NIT device to point at this interface. */ - sio.ic_cmd = NIOCBIND; - sio.ic_len = sizeof *ifp; - sio.ic_dp = (char *)ifp; - sio.ic_timout = INFTIM; - if (ioctl (sock, I_STR, &sio) < 0) - error ("Can't attach interface to nit device: %m"); - - /* Get the low-level address... */ - sio.ic_cmd = SIOCGIFADDR; - sio.ic_len = sizeof ifr; - sio.ic_dp = (char *)𝔦 - sio.ic_timout = INFTIM; - if (ioctl (sock, I_STR, &sio) < 0) - error ("Can't get physical layer address: %m"); - - /* XXX code below assumes ethernet interface! */ - info -> hw_address.hlen = 6; - info -> hw_address.htype = ARPHRD_ETHER; - memcpy (info -> hw_address.haddr, ifr.ifr_ifru.ifru_addr.sa_data, 6); - - if (ioctl (sock, I_PUSH, "pf") < 0) - error ("Can't push packet filter onto NIT: %m"); - - return sock; -} -#endif /* USE_NIT_SEND || USE_NIT_RECEIVE */ - -#ifdef USE_NIT_SEND -void if_register_send (info, interface) - struct interface_info *info; - struct ifreq *interface; -{ - /* If we're using the nit API for sending and receiving, - we don't need to register this interface twice. */ -#ifndef USE_NIT_RECEIVE - struct packetfilt pf; - struct strioctl sio; - - info -> wfdesc = if_register_nit (info, interface); - - pf.Pf_Priority = 0; - pf.Pf_FilterLen = 1; - pf.Pf_Filter [0] = ENF_PUSHZERO; - - /* Set up an NIT filter that rejects everything... */ - sio.ic_cmd = NIOCSETF; - sio.ic_len = sizeof pf; - sio.ic_dp = (char *)&pf; - if (ioctl (info -> wfdesc, I_STR, &sio) < 0) - error ("Can't set NIT filter: %m"); -#else - info -> wfdesc = info -> rfdesc; -#endif - note ("Sending on NIT/%s/%s", - print_hw_addr (info -> hw_address.htype, - info -> hw_address.hlen, - info -> hw_address.haddr), - (info -> shared_network ? - info -> shared_network -> name : "unattached")); -} -#endif /* USE_NIT_SEND */ - -#ifdef USE_NIT_RECEIVE -/* Packet filter program... - XXX Changes to the filter program may require changes to the constant - offsets used in if_register_send to patch the NIT program! XXX */ - -void if_register_receive (info, interface) - struct interface_info *info; - struct ifreq *interface; -{ - int flag = 1; - u_int32_t x; - struct packetfilt pf; - struct strioctl sio; - u_int16_t addr [2]; - struct timeval t; - - /* Open a NIT device and hang it on this interface... */ - info -> rfdesc = if_register_nit (info, interface); - - /* Set the snap length to 0, which means always take the whole - packet. */ - x = 0; - if (ioctl (info -> rfdesc, NIOCSSNAP, &x) < 0) - error ("Can't set NIT snap length: %m"); - - /* Set the stream to byte stream mode */ - if (ioctl (info -> rfdesc, I_SRDOPT, RMSGN) != 0) - note ("I_SRDOPT failed: %m"); - -#if 0 - /* Push on the chunker... */ - if (ioctl (info -> rfdesc, I_PUSH, "nbuf") < 0) - error ("Can't push chunker onto NIT STREAM: %m"); - - /* Set the timeout to zero. */ - t.tv_sec = 0; - t.tv_usec = 0; - if (ioctl (info -> rfdesc, NIOCSTIME, &t) < 0) - error ("Can't set chunk timeout: %m"); -#endif - - /* Ask for no header... */ - x = 0; - if (ioctl (info -> rfdesc, NIOCSFLAGS, &x) < 0) - error ("Can't set NIT flags: %m"); - - /* Set up the NIT filter program. */ - /* XXX Unlike the BPF filter program, this one won't work if the - XXX IP packet is fragmented or if there are options on the IP - XXX header. */ - pf.Pf_Priority = 0; - pf.Pf_FilterLen = 0; - - pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHWORD + 6; - pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHLIT + ENF_CAND; - pf.Pf_Filter [pf.Pf_FilterLen++] = htons (ETHERTYPE_IP); - pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHLIT; - pf.Pf_Filter [pf.Pf_FilterLen++] = htons (IPPROTO_UDP); - pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHWORD + 11; - pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHLIT + ENF_AND; - pf.Pf_Filter [pf.Pf_FilterLen++] = htons (0xFF); - pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_CAND; - pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHWORD + 18; - pf.Pf_Filter [pf.Pf_FilterLen++] = ENF_PUSHLIT + ENF_CAND; - pf.Pf_Filter [pf.Pf_FilterLen++] = server_port; - - /* Install the filter... */ - sio.ic_cmd = NIOCSETF; - sio.ic_len = sizeof pf; - sio.ic_dp = (char *)&pf; - if (ioctl (info -> rfdesc, I_STR, &sio) < 0) - error ("Can't set NIT filter: %m"); - - note ("Listening on NIT/%s/%s", - print_hw_addr (info -> hw_address.htype, - info -> hw_address.hlen, - info -> hw_address.haddr), - (info -> shared_network ? - info -> shared_network -> name : "unattached")); -} -#endif /* USE_NIT_RECEIVE */ - -#ifdef USE_NIT_SEND -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; -{ - int bufp; - unsigned char buf [1536 + sizeof (struct sockaddr)]; - struct sockaddr *junk; - struct strbuf ctl, data; - int hw_end; - struct sockaddr_in foo; - - /* Start with the sockaddr struct... */ - junk = (struct sockaddr *)&buf [0]; - bufp = ((unsigned char *)&junk -> sa_data [0]) - &buf [0]; - - /* Assemble the headers... */ - assemble_hw_header (interface, buf, &bufp, hto); - hw_end = bufp; - assemble_udp_ip_header (interface, buf, &bufp, from.s_addr, - to -> sin_addr.s_addr, to -> sin_port, - raw, len); - - /* Copy the data into the buffer (yuk). */ - memcpy (buf + bufp, raw, len); - - /* Set up the sockaddr structure... */ -#if USE_SIN_LEN - junk -> sa_len = hw_end - 2; /* XXX */ -#endif - junk -> sa_family = AF_UNSPEC; - -#if 0 /* Already done. */ - memcpy (junk.sa_data, buf, hw_len); -#endif - - /* Set up the msg_buf structure... */ - ctl.buf = (char *)&buf [0]; - ctl.maxlen = ctl.len = hw_end; - data.buf = (char *)&buf [hw_end]; - data.maxlen = data.len = bufp + len - hw_end; - - return putmsg (interface -> wfdesc, &ctl, &data, 0); -} -#endif /* USE_NIT_SEND */ - -#ifdef USE_NIT_RECEIVE -size_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 nread; - int length = 0; - int offset = 0; - unsigned char ibuf [1536]; - int bufix = 0; - - length = read (interface -> rfdesc, ibuf, sizeof ibuf); - if (length <= 0) - return length; - - /* Decode the physical header... */ - offset = decode_hw_header (interface, ibuf, bufix, hfrom); - - /* If a physical layer checksum failed (dunno of any - physical layer that supports this, but WTH), skip this - packet. */ - if (offset < 0) { - return 0; - } - - bufix += offset; - length -= offset; - - /* Decode the IP and UDP headers... */ - offset = decode_udp_ip_header (interface, ibuf, bufix, - from, (unsigned char *)0, length); - - /* If the IP or UDP checksum was bad, skip the packet... */ - if (offset < 0) - return 0; - - bufix += offset; - length -= offset; - - /* Copy out the data in the packet... */ - memcpy (buf, &ibuf [bufix], length); - return length; -} -#endif |