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 1.39 2008-04-11 16:47:38 gianluca 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
  39 #include <stdio.h>
  40 #include <string.h>
  41
  42 #include "interface.h"
  43 #include "addrtoname.h"
  44 #include "extract.h"
  45 #include "tftp.h"
  46
  47 static const char tstr[] = " [|tftp]";
  48
  49 /* op code to string mapping */
  50 static const struct tok op2str[] = {
  51         { RRQ,          "RRQ" },        /* read request */
  52         { WRQ,          "WRQ" },        /* write request */
  53         { DATA,         "DATA" },       /* data packet */
  54         { ACK,          "ACK" },        /* acknowledgement */
  55         { TFTP_ERROR,   "ERROR" },      /* error code */
  56         { OACK,         "OACK" },       /* option acknowledgement */
  57         { 0,            NULL }
  58 };
  59
  60 /* error code to string mapping */
  61 static const struct tok err2str[] = {
  62         { EUNDEF,       "EUNDEF" },     /* not defined */
  63         { ENOTFOUND,    "ENOTFOUND" },  /* file not found */
  64         { EACCESS,      "EACCESS" },    /* access violation */
  65         { ENOSPACE,     "ENOSPACE" },   /* disk full or allocation exceeded */
  66         { EBADOP,       "EBADOP" },     /* illegal TFTP operation */
  67         { EBADID,       "EBADID" },     /* unknown transfer ID */
  68         { EEXISTS,      "EEXISTS" },    /* file already exists */
  69         { ENOUSER,      "ENOUSER" },    /* no such user */
  70         { 0,            NULL }
  71 };
  72
  73 /*
  74  * Print trivial file transfer program requests
  75  */
  76 void
  77 tftp_print(register const u_char *bp, u_int length)
  78 {
  79         register const struct tftphdr *tp;
  80         register const char *cp;
  81         register const u_char *p;
  82         register int opcode, i;
  83
  84         tp = (const struct tftphdr *)bp;
  85
  86         /* Print length */
  87         printf(" %d", length);
  88
  89         /* Print tftp request type */
  90         TCHECK(tp->th_opcode);
  91         opcode = EXTRACT_16BITS(&tp->th_opcode);
  92         cp = tok2str(op2str, "tftp-#%d", opcode);
  93         printf(" %s", cp);
  94         /* Bail if bogus opcode */
  95         if (*cp == 't')
  96                 return;
  97
  98         switch (opcode) {
  99
 100         case RRQ:
 101         case WRQ:
 102         case OACK:
 103                 p = (u_char *)tp->th_stuff;
 104                 putchar(' ');
 105                 /* Print filename or first option */
 106                 if (opcode != OACK)
 107                         putchar('"');
 108                 i = fn_print(p, snapend);
 109                 if (opcode != OACK)
 110                         putchar('"');
 111
 112                 /* Print the mode (RRQ and WRQ only) and any options */
 113                 while ((p = (const u_char *)strchr((const char *)p, '\0')) != NULL) {
 114                         if (length <= (u_int)(p - (const u_char *)&tp->th_block))
 115                                 break;
 116                         p++;
 117                         if (*p != '\0') {
 118                                 putchar(' ');
 119                                 fn_print(p, snapend);
 120                         }
 121                 }
 122
 123                 if (i)
 124                         goto trunc;
 125                 break;
 126
 127         case ACK:
 128         case DATA:
 129                 TCHECK(tp->th_block);
 130                 printf(" block %d", EXTRACT_16BITS(&tp->th_block));
 131                 break;
 132
 133         case TFTP_ERROR:
 134                 /* Print error code string */
 135                 TCHECK(tp->th_code);
 136                 printf(" %s \"", tok2str(err2str, "tftp-err-#%d \"",
 137                                        EXTRACT_16BITS(&tp->th_code)));
 138                 /* Print error message string */
 139                 i = fn_print((const u_char *)tp->th_data, snapend);
 140                 putchar('"');
 141                 if (i)
 142                         goto trunc;
 143                 break;
 144
 145         default:
 146                 /* We shouldn't get here */
 147                 printf("(unknown #%d)", opcode);
 148                 break;
 149         }
 150         return;
 151 trunc:
 152         fputs(tstr, stdout);
 153         return;
 154 }