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/*
* Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* Format and print trivial file transfer protocol packets.
*/
#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/tcpdump/print-tftp.c,v 1.39 2008-04-11 16:47:38 gianluca Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#ifdef SEGSIZE
#undef SEGSIZE /* SINIX sucks */
#endif
#include <stdio.h>
#include <string.h>
#include "interface.h"
#include "addrtoname.h"
#include "extract.h"
#include "tftp.h"
/* op code to string mapping */
static struct tok op2str[] = {
{ RRQ, "RRQ" }, /* read request */
{ WRQ, "WRQ" }, /* write request */
{ DATA, "DATA" }, /* data packet */
{ ACK, "ACK" }, /* acknowledgement */
{ TFTP_ERROR, "ERROR" }, /* error code */
{ OACK, "OACK" }, /* option acknowledgement */
{ 0, NULL }
};
/* error code to string mapping */
static struct tok err2str[] = {
{ EUNDEF, "EUNDEF" }, /* not defined */
{ ENOTFOUND, "ENOTFOUND" }, /* file not found */
{ EACCESS, "EACCESS" }, /* access violation */
{ ENOSPACE, "ENOSPACE" }, /* disk full or allocation exceeded */
{ EBADOP, "EBADOP" }, /* illegal TFTP operation */
{ EBADID, "EBADID" }, /* unknown transfer ID */
{ EEXISTS, "EEXISTS" }, /* file already exists */
{ ENOUSER, "ENOUSER" }, /* no such user */
{ 0, NULL }
};
/*
* Print trivial file transfer program requests
*/
void
tftp_print(register const u_char *bp, u_int length)
{
register const struct tftphdr *tp;
register const char *cp;
register const u_char *p;
register int opcode, i;
static char tstr[] = " [|tftp]";
tp = (const struct tftphdr *)bp;
/* Print length */
printf(" %d", length);
/* Print tftp request type */
TCHECK(tp->th_opcode);
opcode = EXTRACT_16BITS(&tp->th_opcode);
cp = tok2str(op2str, "tftp-#%d", opcode);
printf(" %s", cp);
/* Bail if bogus opcode */
if (*cp == 't')
return;
switch (opcode) {
case RRQ:
case WRQ:
case OACK:
p = (u_char *)tp->th_stuff;
putchar(' ');
/* Print filename or first option */
if (opcode != OACK)
putchar('"');
i = fn_print(p, snapend);
if (opcode != OACK)
putchar('"');
/* Print the mode (RRQ and WRQ only) and any options */
while ((p = (const u_char *)strchr((const char *)p, '\0')) != NULL) {
if (length <= (u_int)(p - (const u_char *)&tp->th_block))
break;
p++;
if (*p != '\0') {
putchar(' ');
fn_print(p, snapend);
}
}
if (i)
goto trunc;
break;
case ACK:
case DATA:
TCHECK(tp->th_block);
printf(" block %d", EXTRACT_16BITS(&tp->th_block));
break;
case TFTP_ERROR:
/* Print error code string */
TCHECK(tp->th_code);
printf(" %s \"", tok2str(err2str, "tftp-err-#%d \"",
EXTRACT_16BITS(&tp->th_code)));
/* Print error message string */
i = fn_print((const u_char *)tp->th_data, snapend);
putchar('"');
if (i)
goto trunc;
break;
default:
/* We shouldn't get here */
printf("(unknown #%d)", opcode);
break;
}
return;
trunc:
fputs(tstr, stdout);
return;
}