1 /* $NetBSD: etherfun.h,v 1.5 2011/02/02 17:53:41 chuck Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Charles D. Cranor and Seth Widoff 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 /* etherfun.h */ 28 29 /* constants */ 30 /* ether header */ 31 #define ETYPE_RARP 0x8035 /* ethertype is RARP */ 32 #define ETYPE_IP 0x800 /* ethertype is IP */ 33 34 /* rev arp */ 35 #define PTYPE_IP 0x800 /* Protocol type is IP */ 36 #define OPCODE_RARP 3 /* Optype is REVARP request */ 37 #define OPCODE_REPLY 4 /* Optype is REVARP reply */ 38 39 /* ip header */ 40 #define IPP_UDP 17 /* IP Protocol is UDP */ 41 #define IP_VERSION 4 /* IP version number */ 42 #define IP_HLEN 5 /* IP header length is a fixed 50 bytes */ 43 #define N 1536 44 45 /* tftp header */ 46 #define FTPOP_ACKN 4 /* Opcode is acknowledge */ 47 #define FTPOP_ERR 5 /* Opcode is Error */ 48 #define FTP_PORT 69 /* Standard TFTP port number */ 49 #define MSG "\0\1xxxxxxxx.147\0octet\0" /* implicit NULL */ 50 51 /* data structures */ 52 53 struct ether_header { 54 u_char ether_dhost[6]; 55 u_char ether_shost[6]; 56 u_short ether_type; 57 }; 58 59 struct ether_arp { 60 u_short ar_hrd; /* format of hardware address */ 61 u_short ar_pro; /* format of protocol address */ 62 u_char ar_hln; /* length of hardware address */ 63 u_char ar_pln; /* length of protocol address */ 64 u_short ar_op; 65 u_char arp_sha[6]; /* sender hardware address */ 66 u_char arp_spa[4]; /* sender protocol address */ 67 u_char arp_tha[6]; /* target hardware address */ 68 u_char arp_tpa[4]; /* target protocol address */ 69 }; 70 71 struct ip { 72 u_char ip_v:4, /* version */ 73 ip_hl:4; /* header length */ 74 u_char ip_tos; /* type of service */ 75 short ip_len; /* total length */ 76 u_short ip_id; /* identification */ 77 short ip_off; /* fragment offset field */ 78 #define IP_DF 0x4000 /* dont fragment flag */ 79 #define IP_MF 0x2000 /* more fragments flag */ 80 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 81 u_char ip_ttl; /* time to live */ 82 u_char ip_p; /* protocol */ 83 u_short ip_sum; /* checksum */ 84 u_char ip_src[4]; 85 u_char ip_dst[4]; /* source and dest address */ 86 }; 87 88 struct udp { 89 u_short uh_sport; 90 u_short uh_dport; 91 short uh_ulen; 92 u_short uh_sum; 93 }; 94 95 struct tftph { 96 u_short op_code; 97 u_short block; 98 }; 99 100 struct tftphr { 101 struct tftph info; 102 char data[1]; 103 }; 104 105 /* globals */ 106 int last_ack; 107 u_char buf[N]; 108 struct ether_header *eh = (struct ether_header *)buf; 109 struct ether_arp *rarp = 110 (struct ether_arp *)(buf + sizeof(struct ether_header)); 111 struct ip *iph = (struct ip *)(buf + sizeof(struct ether_header)); 112 struct udp *udph = (struct udp *)(buf + sizeof(struct ether_header) + 113 sizeof(struct ip)); 114 u_char *tftp_r = buf + sizeof(struct ether_header) + sizeof(struct ip) + 115 sizeof(struct udp); 116 struct tftph *tftp_a = (struct tftph *)(buf + sizeof(struct ether_header) + 117 sizeof(struct ip) + sizeof(struct udp)); 118 struct tftphr *tftp = (struct tftphr *)(buf + sizeof(struct ether_header) + 119 sizeof(struct ip) + sizeof(struct udp)); 120