1 /* $NetBSD: etherfun.h,v 1.4 2008/01/12 09:54:33 tsutsui Exp $ */ 2 3 /* 4 * 5 * Copyright (c) 1995 Charles D. Cranor and Seth Widoff 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Charles D. Cranor 19 * and Seth Widoff. 20 * 4. The name of the author may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 /* etherfun.h */ 35 36 /* constants */ 37 /* ether header */ 38 #define ETYPE_RARP 0x8035 /* ethertype is RARP */ 39 #define ETYPE_IP 0x800 /* ethertype is IP */ 40 41 /* rev arp */ 42 #define PTYPE_IP 0x800 /* Protocol type is IP */ 43 #define OPCODE_RARP 3 /* Optype is REVARP request */ 44 #define OPCODE_REPLY 4 /* Optype is REVARP reply */ 45 46 /* ip header */ 47 #define IPP_UDP 17 /* IP Protocol is UDP */ 48 #define IP_VERSION 4 /* IP version number */ 49 #define IP_HLEN 5 /* IP header length is a fixed 50 bytes */ 50 #define N 1536 51 52 /* tftp header */ 53 #define FTPOP_ACKN 4 /* Opcode is acknowledge */ 54 #define FTPOP_ERR 5 /* Opcode is Error */ 55 #define FTP_PORT 69 /* Standard TFTP port number */ 56 #define MSG "\0\1xxxxxxxx.147\0octet\0" /* implicit NULL */ 57 58 /* data structures */ 59 60 struct ether_header { 61 u_char ether_dhost[6]; 62 u_char ether_shost[6]; 63 u_short ether_type; 64 }; 65 66 struct ether_arp { 67 u_short ar_hrd; /* format of hardware address */ 68 u_short ar_pro; /* format of protocol address */ 69 u_char ar_hln; /* length of hardware address */ 70 u_char ar_pln; /* length of protocol address */ 71 u_short ar_op; 72 u_char arp_sha[6]; /* sender hardware address */ 73 u_char arp_spa[4]; /* sender protocol address */ 74 u_char arp_tha[6]; /* target hardware address */ 75 u_char arp_tpa[4]; /* target protocol address */ 76 }; 77 78 struct ip { 79 u_char ip_v:4, /* version */ 80 ip_hl:4; /* header length */ 81 u_char ip_tos; /* type of service */ 82 short ip_len; /* total length */ 83 u_short ip_id; /* identification */ 84 short ip_off; /* fragment offset field */ 85 #define IP_DF 0x4000 /* dont fragment flag */ 86 #define IP_MF 0x2000 /* more fragments flag */ 87 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 88 u_char ip_ttl; /* time to live */ 89 u_char ip_p; /* protocol */ 90 u_short ip_sum; /* checksum */ 91 u_char ip_src[4]; 92 u_char ip_dst[4]; /* source and dest address */ 93 }; 94 95 struct udp { 96 u_short uh_sport; 97 u_short uh_dport; 98 short uh_ulen; 99 u_short uh_sum; 100 }; 101 102 struct tftph { 103 u_short op_code; 104 u_short block; 105 }; 106 107 struct tftphr { 108 struct tftph info; 109 char data[1]; 110 }; 111 112 /* globals */ 113 int last_ack; 114 u_char buf[N]; 115 struct ether_header *eh = (struct ether_header *)buf; 116 struct ether_arp *rarp = 117 (struct ether_arp *)(buf + sizeof(struct ether_header)); 118 struct ip *iph = (struct ip *)(buf + sizeof(struct ether_header)); 119 struct udp *udph = (struct udp *)(buf + sizeof(struct ether_header) + 120 sizeof(struct ip)); 121 u_char *tftp_r = buf + sizeof(struct ether_header) + sizeof(struct ip) + 122 sizeof(struct udp); 123 struct tftph *tftp_a = (struct tftph *)(buf + sizeof(struct ether_header) + 124 sizeof(struct ip) + sizeof(struct udp)); 125 struct tftphr *tftp = (struct tftphr *)(buf + sizeof(struct ether_header) + 126 sizeof(struct ip) + sizeof(struct udp)); 127