The Tcpdump Group git mirrors - tcpdump/blobdiff

* 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.

* 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

+/* \summary: Trivial File Transfer Protocol (TFTP) printer */

#ifdef HAVE_CONFIG_H

-#include "config.h"

+#include <config.h>

#endif

-#include <tcpdump-stdinc.h>

+#include "netdissect-stdinc.h"

-#ifdef SEGSIZE

-#undef SEGSIZE /* SINIX sucks */

-#endif

+#include "netdissect.h"

+#include "extract.h"

-#include <stdio.h>

-#include <string.h>

+/*

+ * Trivial File Transfer Protocol (IEN-133)

+ */

+

+/*

+ * Packet types.

+ */

+#define RRQ 01 /* read request */

+#define WRQ 02 /* write request */

+#define DATA 03 /* data packet */

+#define ACK 04 /* acknowledgement */

+#define TFTP_ERROR 05 /* error code */

+#define OACK 06 /* option acknowledgement */

+

+/*

+ * Error codes.

+ */

+#define EUNDEF 0 /* not defined */

+#define ENOTFOUND 1 /* file not found */

+#define EACCESS 2 /* access violation */

+#define ENOSPACE 3 /* disk full or allocation exceeded */

+#define EBADOP 4 /* illegal TFTP operation */

+#define EBADID 5 /* unknown transfer ID */

+#define EEXISTS 6 /* file already exists */

+#define ENOUSER 7 /* no such user */

-#include "interface.h"

-#include "addrtoname.h"

-#include "extract.h"

-#include "tftp.h"

/* op code to string mapping */

static const struct tok op2str[] = {

/* op code to string mapping */

static const struct tok op2str[] = {

* Print trivial file transfer program requests

*/

void

* Print trivial file transfer program requests

*/

void

-tftp_print(register const u_char *bp, u_int length)

+tftp_print(netdissect_options *ndo,

+ 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]";

+ const char *cp;

+ u_int opcode;

+ u_int ui;

- tp = (const struct tftphdr *)bp;

+ ndo->ndo_protocol = "tftp";

+ /* Print protocol */

+ nd_print_protocol_caps(ndo);

/* Print length */

- printf(" %d", length);

+ ND_PRINT(", length %u", length);

/* Print tftp request type */

- TCHECK(tp->th_opcode);

- opcode = EXTRACT_16BITS(&tp->th_opcode);

- cp = tok2str(op2str, "tftp-#%d", opcode);

- printf(" %s", cp);

+ if (length < 2)

+ goto trunc;

+ opcode = GET_BE_U_2(bp);

+ cp = tok2str(op2str, "tftp-#%u", opcode);

+ ND_PRINT(", %s", cp);

/* Bail if bogus opcode */

if (*cp == 't')

return;

/* Bail if bogus opcode */

if (*cp == 't')

return;

+ bp += 2;

+ length -= 2;

switch (opcode) {

case RRQ:

case WRQ:

switch (opcode) {

case RRQ:

case WRQ:

+ if (length == 0)

+ goto trunc;

+ ND_PRINT(" ");

+ /* Print filename */

+ ND_PRINT("\"");

+ ui = nd_printztn(ndo, bp, length, ndo->ndo_snapend);

+ ND_PRINT("\"");

+ if (ui == 0)

+ goto trunc;

+ bp += ui;

+ length -= ui;

+

+ /* Print the mode - RRQ and WRQ only */

+ if (length == 0)

+ goto trunc; /* no mode */

+ ND_PRINT(" ");

+ ui = nd_printztn(ndo, bp, length, ndo->ndo_snapend);

+ if (ui == 0)

+ goto trunc;

+ bp += ui;

+ length -= ui;

+

+ /* Print options, if any */

+ while (length != 0) {

+ if (GET_U_1(bp) != '\0')

+ ND_PRINT(" ");

+ ui = nd_printztn(ndo, bp, length, ndo->ndo_snapend);

+ if (ui == 0)

+ goto trunc;

+ bp += ui;

+ length -= ui;

+ }

+ break;

+

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);

- }

+ /* Print options */

+ while (length != 0) {

+ if (GET_U_1(bp) != '\0')

+ ND_PRINT(" ");

+ ui = nd_printztn(ndo, bp, length, ndo->ndo_snapend);

+ if (ui == 0)

+ goto trunc;

+ bp += ui;

+ length -= ui;

}

-

- if (i)

- goto trunc;

break;

case ACK:

case DATA:

break;

case ACK:

case DATA:

- TCHECK(tp->th_block);

- printf(" block %d", EXTRACT_16BITS(&tp->th_block));

+ if (length < 2)

+ goto trunc; /* no block number */

+ ND_PRINT(" block %u", GET_BE_U_2(bp));

break;

case TFTP_ERROR:

/* Print error code string */

break;

case TFTP_ERROR:

/* Print error code string */

- TCHECK(tp->th_code);

- printf(" %s \"", tok2str(err2str, "tftp-err-#%d \"",

- EXTRACT_16BITS(&tp->th_code)));

+ if (length < 2)

+ goto trunc; /* no error code */

+ ND_PRINT(" %s", tok2str(err2str, "tftp-err-#%u \"",

+ GET_BE_U_2(bp)));

+ bp += 2;

+ length -= 2;

/* Print error message string */

- i = fn_print((const u_char *)tp->th_data, snapend);

- putchar('"');

- if (i)

+ if (length == 0)

+ goto trunc; /* no error message */

+ ND_PRINT(" \"");

+ ui = nd_printztn(ndo, bp, length, ndo->ndo_snapend);

+ ND_PRINT("\"");

+ if (ui == 0)

goto trunc;

break;

default:

/* We shouldn't get here */

goto trunc;

break;

default:

/* We shouldn't get here */

- printf("(unknown #%d)", opcode);

+ ND_PRINT("(unknown #%u)", opcode);

break;

}

return;

trunc:

break;

}

return;

trunc:

- fputs(tstr, stdout);

- return;

+ nd_print_trunc(ndo);

}