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etherfun.h revision 1.2 
      1 /*	$NetBSD: etherfun.h,v 1.2 1998/01/05 07:03:06 perry 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 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 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