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[] =
  26     "@(#) $Header: /tcpdump/master/tcpdump/print-tftp.c,v 1.32 2002-08-01 08:53:32 risso 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
  46 /* op code to string mapping */
  47 static struct tok op2str[] = {
  48         { RRQ,          "RRQ" },        /* read request */
  49         { WRQ,          "WRQ" },        /* write request */
  50         { DATA,         "DATA" },       /* data packet */
  51         { ACK,          "ACK" },        /* acknowledgement */
  52         { ERROR,        "ERROR" },      /* error code */
  53         { 0,            NULL }
  54 };
  55
  56 /* error code to string mapping */
  57 static struct tok err2str[] = {
  58         { EUNDEF,       "EUNDEF" },     /* not defined */
  59         { ENOTFOUND,    "ENOTFOUND" },  /* file not found */
  60         { EACCESS,      "EACCESS" },    /* access violation */
  61         { ENOSPACE,     "ENOSPACE" },   /* disk full or allocation exceeded */
  62         { EBADOP,       "EBADOP" },     /* illegal TFTP operation */
  63         { EBADID,       "EBADID" },     /* unknown transfer ID */
  64         { EEXISTS,      "EEXISTS" },    /* file already exists */
  65         { ENOUSER,      "ENOUSER" },    /* no such user */
  66         { 0,            NULL }
  67 };
  68
  69 /*
  70  * Print trivial file transfer program requests
  71  */
  72 void
  73 tftp_print(register const u_char *bp, u_int length)
  74 {
  75         register const struct tftphdr *tp;
  76         register const char *cp;
  77         register const u_char *p;
  78         register int opcode, i;
  79         static char tstr[] = " [|tftp]";
  80
  81         tp = (const struct tftphdr *)bp;
  82
  83         /* Print length */
  84         printf(" %d", length);
  85
  86         /* Print tftp request type */
  87         TCHECK(tp->th_opcode);
  88         opcode = ntohs(tp->th_opcode);
  89         cp = tok2str(op2str, "tftp-#%d", opcode);
  90         printf(" %s", cp);
  91         /* Bail if bogus opcode */
  92         if (*cp == 't')
  93                 return;
  94
  95         switch (opcode) {
  96
  97         case RRQ:
  98         case WRQ:
  99                 /*
 100                  * XXX Not all arpa/tftp.h's specify th_stuff as any
 101                  * array; use address of th_block instead
 102                  */
 103 #ifdef notdef
 104                 p = (u_char *)tp->th_stuff;
 105 #else
 106                 p = (u_char *)&tp->th_block;
 107 #endif
 108                 fputs(" \"", stdout);
 109                 i = fn_print(p, snapend);
 110                 putchar('"');
 111                 if (i)
 112                         goto trunc;
 113                 break;
 114
 115         case ACK:
 116         case DATA:
 117                 TCHECK(tp->th_block);
 118                 printf(" block %d", ntohs(tp->th_block));
 119                 break;
 120
 121         case ERROR:
 122                 /* Print error code string */
 123                 TCHECK(tp->th_code);
 124                 printf(" %s ", tok2str(err2str, "tftp-err-#%d \"",
 125                                        ntohs(tp->th_code)));
 126                 /* Print error message string */
 127                 i = fn_print((const u_char *)tp->th_data, snapend);
 128                 putchar('"');
 129                 if (i)
 130                         goto trunc;
 131                 break;
 132
 133         default:
 134                 /* We shouldn't get here */
 135                 printf("(unknown #%d)", opcode);
 136                 break;
 137         }
 138         return;
 139 trunc:
 140         fputs(tstr, stdout);
 141         return;
 142 }