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 1.31 1999-11-21 09:37:03 fenner Exp $ (LBL)";
  27 #endif
  28
  29 #ifdef HAVE_CONFIG_H
  30 #include "config.h"
  31 #endif
  32
  33 #include <sys/param.h>
  34 #include <sys/time.h>
  35
  36 #include <netinet/in.h>
  37
  38 #ifdef SEGSIZE
  39 #undef SEGSIZE                                  /* SINIX sucks */
  40 #endif
  41 #include <arpa/tftp.h>
  42
  43 #include <ctype.h>
  44 #include <stdio.h>
  45 #include <string.h>
  46
  47 #include "interface.h"
  48 #include "addrtoname.h"
  49
  50 /* op code to string mapping */
  51 static struct tok op2str[] = {
  52         { RRQ,          "RRQ" },        /* read request */
  53         { WRQ,          "WRQ" },        /* write request */
  54         { DATA,         "DATA" },       /* data packet */
  55         { ACK,          "ACK" },        /* acknowledgement */
  56         { ERROR,        "ERROR" },      /* error code */
  57         { 0,            NULL }
  58 };
  59
  60 /* error code to string mapping */
  61 static 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         static char tstr[] = " [|tftp]";
  84
  85         tp = (const struct tftphdr *)bp;
  86
  87         /* Print length */
  88         printf(" %d", length);
  89
  90         /* Print tftp request type */
  91         TCHECK(tp->th_opcode);
  92         opcode = ntohs(tp->th_opcode);
  93         cp = tok2str(op2str, "tftp-#%d", opcode);
  94         printf(" %s", cp);
  95         /* Bail if bogus opcode */
  96         if (*cp == 't')
  97                 return;
  98
  99         switch (opcode) {
 100
 101         case RRQ:
 102         case WRQ:
 103                 /*
 104                  * XXX Not all arpa/tftp.h's specify th_stuff as any
 105                  * array; use address of th_block instead
 106                  */
 107 #ifdef notdef
 108                 p = (u_char *)tp->th_stuff;
 109 #else
 110                 p = (u_char *)&tp->th_block;
 111 #endif
 112                 fputs(" \"", stdout);
 113                 i = fn_print(p, snapend);
 114                 putchar('"');
 115                 if (i)
 116                         goto trunc;
 117                 break;
 118
 119         case ACK:
 120         case DATA:
 121                 TCHECK(tp->th_block);
 122                 printf(" block %d", ntohs(tp->th_block));
 123                 break;
 124
 125         case ERROR:
 126                 /* Print error code string */
 127                 TCHECK(tp->th_code);
 128                 printf(" %s ", tok2str(err2str, "tftp-err-#%d \"",
 129                                        ntohs(tp->th_code)));
 130                 /* Print error message string */
 131                 i = fn_print((const u_char *)tp->th_data, snapend);
 132                 putchar('"');
 133                 if (i)
 134                         goto trunc;
 135                 break;
 136
 137         default:
 138                 /* We shouldn't get here */
 139                 printf("(unknown #%d)", opcode);
 140                 break;
 141         }
 142         return;
 143 trunc:
 144         fputs(tstr, stdout);
 145         return;
 146 }