The Tcpdump Group git mirrors - tcpdump/blob - print-tftp.c

   1 /*
   2  * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  *
  21  * Format and print trivial file transfer protocol packets.
  22  */
  23
  24 #ifndef lint
  25 static const char rcsid[] _U_ =
  26     "@(#) $Header: /tcpdump/master/tcpdump/print-tftp.c,v 1.35.2.2 2003-11-16 08:51:50 guy Exp $ (LBL)";
  27 #endif
  28
  29 #ifdef HAVE_CONFIG_H
  30 #include "config.h"
  31 #endif
  32
  33 #include <tcpdump-stdinc.h>
  34
  35 #ifdef SEGSIZE
  36 #undef SEGSIZE                                  /* SINIX sucks */
  37 #endif
  38 #include <arpa/tftp.h>
  39
  40 #include <stdio.h>
  41 #include <string.h>
  42
  43 #include "interface.h"
  44 #include "addrtoname.h"
  45 #include "extract.h"
  46
  47 /* op code to string mapping */
  48 static struct tok op2str[] = {
  49         { RRQ,          "RRQ" },        /* read request */
  50         { WRQ,          "WRQ" },        /* write request */
  51         { DATA,         "DATA" },       /* data packet */
  52         { ACK,          "ACK" },        /* acknowledgement */
  53         { ERROR,        "ERROR" },      /* error code */
  54         { 0,            NULL }
  55 };
  56
  57 /* error code to string mapping */
  58 static struct tok err2str[] = {
  59         { EUNDEF,       "EUNDEF" },     /* not defined */
  60         { ENOTFOUND,    "ENOTFOUND" },  /* file not found */
  61         { EACCESS,      "EACCESS" },    /* access violation */
  62         { ENOSPACE,     "ENOSPACE" },   /* disk full or allocation exceeded */
  63         { EBADOP,       "EBADOP" },     /* illegal TFTP operation */
  64         { EBADID,       "EBADID" },     /* unknown transfer ID */
  65         { EEXISTS,      "EEXISTS" },    /* file already exists */
  66         { ENOUSER,      "ENOUSER" },    /* no such user */
  67         { 0,            NULL }
  68 };
  69
  70 /*
  71  * Print trivial file transfer program requests
  72  */
  73 void
  74 tftp_print(register const u_char *bp, u_int length)
  75 {
  76         register const struct tftphdr *tp;
  77         register const char *cp;
  78         register const u_char *p;
  79         register int opcode, i;
  80         static char tstr[] = " [|tftp]";
  81
  82         tp = (const struct tftphdr *)bp;
  83
  84         /* Print length */
  85         printf(" %d", length);
  86
  87         /* Print tftp request type */
  88         TCHECK(tp->th_opcode);
  89         opcode = EXTRACT_16BITS(&tp->th_opcode);
  90         cp = tok2str(op2str, "tftp-#%d", opcode);
  91         printf(" %s", cp);
  92         /* Bail if bogus opcode */
  93         if (*cp == 't')
  94                 return;
  95
  96         switch (opcode) {
  97
  98         case RRQ:
  99         case WRQ:
 100                 /*
 101                  * XXX Not all arpa/tftp.h's specify th_stuff as any
 102                  * array; use address of th_block instead
 103                  */
 104 #ifdef notdef
 105                 p = (u_char *)tp->th_stuff;
 106 #else
 107                 p = (u_char *)&tp->th_block;
 108 #endif
 109                 fputs(" \"", stdout);
 110                 i = fn_print(p, snapend);
 111                 putchar('"');
 112
 113                 /* Print the mode and any options */
 114                 while ((p = (const u_char *)strchr((const char *)p, '\0')) != NULL) {
 115                         if (length <= (u_int)(p - (const u_char *)&tp->th_block))
 116                                 break;
 117                         p++;
 118                         if (*p != '\0') {
 119                                 putchar(' ');
 120                                 fn_print(p, snapend);
 121                         }
 122                 }
 123
 124                 if (i)
 125                         goto trunc;
 126                 break;
 127
 128         case ACK:
 129         case DATA:
 130                 TCHECK(tp->th_block);
 131                 printf(" block %d", EXTRACT_16BITS(&tp->th_block));
 132                 break;
 133
 134         case ERROR:
 135                 /* Print error code string */
 136                 TCHECK(tp->th_code);
 137                 printf(" %s ", tok2str(err2str, "tftp-err-#%d \"",
 138                                        EXTRACT_16BITS(&tp->th_code)));
 139                 /* Print error message string */
 140                 i = fn_print((const u_char *)tp->th_data, snapend);
 141                 putchar('"');
 142                 if (i)
 143                         goto trunc;
 144                 break;
 145
 146         default:
 147                 /* We shouldn't get here */
 148                 printf("(unknown #%d)", opcode);
 149                 break;
 150         }
 151         return;
 152 trunc:
 153         fputs(tstr, stdout);
 154         return;
 155 }