127 lines
4.9 KiB
C
127 lines
4.9 KiB
C
/* $NetBSD: etherfun.h,v 1.2 1998/01/05 07:03:06 perry Exp $ */
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/*
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*
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* Copyright (c) 1995 Charles D. Cranor and Seth Widoff
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Charles D. Cranor
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* and Seth Widoff.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* etherfun.h */
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/* constants */
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/* ether header */
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#define ETYPE_RARP 0x8035 /* ethertype is RARP */
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#define ETYPE_IP 0x800 /* ethertype is IP */
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/* rev arp */
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#define PTYPE_IP 0x800 /* Protocol type is IP */
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#define OPCODE_RARP 3 /* Optype is REVARP request */
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#define OPCODE_REPLY 4 /* Optype is REVARP reply */
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/* ip header */
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#define IPP_UDP 17 /* IP Protocol is UDP */
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#define IP_VERSION 4 /* IP version number */
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#define IP_HLEN 5 /* IP header length is a fixed 50 bytes */
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#define N 1536
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/* tftp header */
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#define FTPOP_ACKN 4 /* Opcode is acknowledge */
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#define FTPOP_ERR 5 /* Opcode is Error */
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#define FTP_PORT 69 /* Standard TFTP port number */
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#define MSG "\0\1xxxxxxxx.147\0octet\0" /* implicit NULL */
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/* data structures */
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struct ether_header {
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u_char ether_dhost[6];
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u_char ether_shost[6];
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u_short ether_type;
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};
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struct ether_arp {
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u_short ar_hrd; /* format of hardware address */
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u_short ar_pro; /* format of protocol address */
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u_char ar_hln; /* length of hardware address */
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u_char ar_pln; /* length of protocol address */
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u_short ar_op;
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u_char arp_sha[6]; /* sender hardware address */
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u_char arp_spa[4]; /* sender protocol address */
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u_char arp_tha[6]; /* target hardware address */
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u_char arp_tpa[4]; /* target protocol address */
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};
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struct ip {
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u_char ip_v:4, /* version */
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ip_hl:4; /* header length */
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u_char ip_tos; /* type of service */
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short ip_len; /* total length */
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u_short ip_id; /* identification */
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short ip_off; /* fragment offset field */
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#define IP_DF 0x4000 /* dont fragment flag */
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#define IP_MF 0x2000 /* more fragments flag */
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#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
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u_char ip_ttl; /* time to live */
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u_char ip_p; /* protocol */
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u_short ip_sum; /* checksum */
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u_char ip_src[4];
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u_char ip_dst[4]; /* source and dest address */
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};
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struct udp {
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u_short uh_sport;
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u_short uh_dport;
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short uh_ulen;
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u_short uh_sum;
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};
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struct tftph {
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u_short op_code;
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u_short block;
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};
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struct tftphr {
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struct tftph info;
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char data[1];
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};
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/* globals */
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int last_ack;
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char buf[N];
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struct ether_header *eh = (struct ether_header *)buf;
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struct ether_arp *rarp =
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(struct ether_arp *)(buf + sizeof(struct ether_header));
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struct ip *iph = (struct ip *)(buf + sizeof(struct ether_header));
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struct udp *udph = (struct udp *)(buf + sizeof(struct ether_header) +
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sizeof(struct ip));
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char *tftp_r = buf + sizeof(struct ether_header) + sizeof(struct ip) +
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sizeof(struct udp);
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struct tftph *tftp_a = (struct tftph *)(buf + sizeof(struct ether_header) +
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sizeof(struct ip) + sizeof(struct udp));
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struct tftphr *tftp = (struct tftphr *)(buf + sizeof(struct ether_header) +
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sizeof(struct ip) + sizeof(struct udp));
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