dist/tcpdump/print-tftp.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that: (1) source code distributions
   9  * retain the above copyright notice and this paragraph in its entirety, (2)
  10  * distributions including binary code include the above copyright notice and
  11  * this paragraph in its entirety in the documentation or other materials
  12  * provided with the distribution, and (3) all advertising materials mentioning
  13  * features or use of this software display the following acknowledgement:
  14  * ``This product includes software developed by the University of California,
  15  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  16  * the University nor the names of its contributors may be used to endorse
  17  * or promote products derived from this software without specific prior
  18  * written permission.
  19  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  20  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  21  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  22  *
  23  * Format and print trivial file transfer protocol packets.
  24  */
  25
  26 #include <sys/cdefs.h>
  27 #ifndef lint
  28 #if 0
  29 static const char rcsid[] _U_ =
  30     "@(#) Header: /tcpdump/master/tcpdump/print-tftp.c,v 1.37 2003/11/16 09:36:40 guy Exp (LBL)";
  31 #else
  32 __RCSID("$NetBSD: tcpdump2rcsid.ex,v 1.1 2001/06/25 20:09:58 itojun Exp $");
  33 #endif
  34 #endif
  35
  36 #ifdef HAVE_CONFIG_H
  37 #include "config.h"
  38 #endif
  39
  40 #include <tcpdump-stdinc.h>
  41
  42 #ifdef SEGSIZE
  43 #undef SEGSIZE                                  /* SINIX sucks */
  44 #endif
  45 #include <arpa/tftp.h>
  46
  47 #include <stdio.h>
  48 #include <string.h>
  49
  50 #include "interface.h"
  51 #include "addrtoname.h"
  52 #include "extract.h"
  53
  54 /* op code to string mapping */
  55 static struct tok op2str[] = {
  56         { RRQ,          "RRQ" },        /* read request */
  57         { WRQ,          "WRQ" },        /* write request */
  58         { DATA,         "DATA" },       /* data packet */
  59         { ACK,          "ACK" },        /* acknowledgement */
  60         { ERROR,        "ERROR" },      /* error code */
  61         { 0,            NULL }
  62 };
  63
  64 /* error code to string mapping */
  65 static struct tok err2str[] = {
  66         { EUNDEF,       "EUNDEF" },     /* not defined */
  67         { ENOTFOUND,    "ENOTFOUND" },  /* file not found */
  68         { EACCESS,      "EACCESS" },    /* access violation */
  69         { ENOSPACE,     "ENOSPACE" },   /* disk full or allocation exceeded */
  70         { EBADOP,       "EBADOP" },     /* illegal TFTP operation */
  71         { EBADID,       "EBADID" },     /* unknown transfer ID */
  72         { EEXISTS,      "EEXISTS" },    /* file already exists */
  73         { ENOUSER,      "ENOUSER" },    /* no such user */
  74         { 0,            NULL }
  75 };
  76
  77 /*
  78  * Print trivial file transfer program requests
  79  */
  80 void
  81 tftp_print(register const u_char *bp, u_int length)
  82 {
  83         register const struct tftphdr *tp;
  84         register const char *cp;
  85         register const u_char *p;
  86         register int opcode, i;
  87         static char tstr[] = " [|tftp]";
  88
  89         tp = (const struct tftphdr *)bp;
  90
  91         /* Print length */
  92         printf(" %d", length);
  93
  94         /* Print tftp request type */
  95         TCHECK(tp->th_opcode);
  96         opcode = EXTRACT_16BITS(&tp->th_opcode);
  97         cp = tok2str(op2str, "tftp-#%d", opcode);
  98         printf(" %s", cp);
  99         /* Bail if bogus opcode */
 100         if (*cp == 't')
 101                 return;
 102
 103         switch (opcode) {
 104
 105         case RRQ:
 106         case WRQ:
 107                 /*
 108                  * XXX Not all arpa/tftp.h's specify th_stuff as any
 109                  * array; use address of th_block instead
 110                  */
 111 #ifdef notdef
 112                 p = (u_char *)tp->th_stuff;
 113 #else
 114                 p = (u_char *)&tp->th_block;
 115 #endif
 116                 fputs(" \"", stdout);
 117                 i = fn_print(p, snapend);
 118                 putchar('"');
 119
 120                 /* Print the mode and any options */
 121                 while ((p = (const u_char *)strchr((const char *)p, '\0')) != NULL) {
 122                         if (length <= (u_int)(p - (const u_char *)&tp->th_block))
 123                                 break;
 124                         p++;
 125                         if (*p != '\0') {
 126                                 putchar(' ');
 127                                 fn_print(p, snapend);
 128                         }
 129                 }
 130
 131                 if (i)
 132                         goto trunc;
 133                 break;
 134
 135         case ACK:
 136         case DATA:
 137                 TCHECK(tp->th_block);
 138                 printf(" block %d", EXTRACT_16BITS(&tp->th_block));
 139                 break;
 140
 141         case ERROR:
 142                 /* Print error code string */
 143                 TCHECK(tp->th_code);
 144                 printf(" %s ", tok2str(err2str, "tftp-err-#%d \"",
 145                                        EXTRACT_16BITS(&tp->th_code)));
 146                 /* Print error message string */
 147                 i = fn_print((const u_char *)tp->th_data, snapend);
 148                 putchar('"');
 149                 if (i)
 150                         goto trunc;
 151                 break;
 152
 153         default:
 154                 /* We shouldn't get here */
 155                 printf("(unknown #%d)", opcode);
 156                 break;
 157         }
 158         return;
 159 trunc:
 160         fputs(tstr, stdout);
 161         return;
 162 }