Local changes: - Update some local modifications to fix build - Synch config.h with upstream as much as possible Changelog: https://git.tcpdump.org/tcpdump/blob/55bc126b0216cfe409b8d6bd378f65679d136ddf:/CHANGES Reviewed by: emaste Obtained from: https://www.tcpdump.org/release/tcpdump-4.99.4.tar.gz Sponsored by: The FreeBSD Foundation
199 lines
5.0 KiB
C
199 lines
5.0 KiB
C
/*
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* Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/* \summary: Trivial File Transfer Protocol (TFTP) printer */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "netdissect-stdinc.h"
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#include "netdissect.h"
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#include "extract.h"
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/*
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* Trivial File Transfer Protocol (IEN-133)
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*/
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/*
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* Packet types.
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*/
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#define RRQ 01 /* read request */
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#define WRQ 02 /* write request */
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#define DATA 03 /* data packet */
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#define ACK 04 /* acknowledgement */
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#define TFTP_ERROR 05 /* error code */
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#define OACK 06 /* option acknowledgement */
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/*
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* Error codes.
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*/
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#define EUNDEF 0 /* not defined */
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#define ENOTFOUND 1 /* file not found */
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#define EACCESS 2 /* access violation */
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#define ENOSPACE 3 /* disk full or allocation exceeded */
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#define EBADOP 4 /* illegal TFTP operation */
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#define EBADID 5 /* unknown transfer ID */
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#define EEXISTS 6 /* file already exists */
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#define ENOUSER 7 /* no such user */
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/* op code to string mapping */
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static const struct tok op2str[] = {
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{ RRQ, "RRQ" }, /* read request */
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{ WRQ, "WRQ" }, /* write request */
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{ DATA, "DATA" }, /* data packet */
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{ ACK, "ACK" }, /* acknowledgement */
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{ TFTP_ERROR, "ERROR" }, /* error code */
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{ OACK, "OACK" }, /* option acknowledgement */
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{ 0, NULL }
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};
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/* error code to string mapping */
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static const struct tok err2str[] = {
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{ EUNDEF, "EUNDEF" }, /* not defined */
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{ ENOTFOUND, "ENOTFOUND" }, /* file not found */
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{ EACCESS, "EACCESS" }, /* access violation */
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{ ENOSPACE, "ENOSPACE" }, /* disk full or allocation exceeded */
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{ EBADOP, "EBADOP" }, /* illegal TFTP operation */
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{ EBADID, "EBADID" }, /* unknown transfer ID */
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{ EEXISTS, "EEXISTS" }, /* file already exists */
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{ ENOUSER, "ENOUSER" }, /* no such user */
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{ 0, NULL }
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};
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/*
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* Print trivial file transfer program requests
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*/
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void
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tftp_print(netdissect_options *ndo,
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const u_char *bp, u_int length)
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{
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const char *cp;
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u_int opcode;
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u_int ui;
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ndo->ndo_protocol = "tftp";
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/* Print protocol */
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nd_print_protocol_caps(ndo);
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/* Print length */
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ND_PRINT(", length %u", length);
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/* Print tftp request type */
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if (length < 2)
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goto trunc;
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opcode = GET_BE_U_2(bp);
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cp = tok2str(op2str, "tftp-#%u", opcode);
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ND_PRINT(", %s", cp);
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/* Bail if bogus opcode */
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if (*cp == 't')
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return;
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bp += 2;
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length -= 2;
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switch (opcode) {
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case RRQ:
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case WRQ:
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if (length == 0)
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goto trunc;
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ND_PRINT(" ");
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/* Print filename */
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ND_PRINT("\"");
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ui = nd_printztn(ndo, bp, length, ndo->ndo_snapend);
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ND_PRINT("\"");
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if (ui == 0)
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goto trunc;
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bp += ui;
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length -= ui;
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/* Print the mode - RRQ and WRQ only */
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if (length == 0)
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goto trunc; /* no mode */
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ND_PRINT(" ");
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ui = nd_printztn(ndo, bp, length, ndo->ndo_snapend);
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if (ui == 0)
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goto trunc;
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bp += ui;
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length -= ui;
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/* Print options, if any */
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while (length != 0) {
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if (GET_U_1(bp) != '\0')
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ND_PRINT(" ");
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ui = nd_printztn(ndo, bp, length, ndo->ndo_snapend);
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if (ui == 0)
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goto trunc;
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bp += ui;
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length -= ui;
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}
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break;
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case OACK:
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/* Print options */
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while (length != 0) {
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if (GET_U_1(bp) != '\0')
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ND_PRINT(" ");
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ui = nd_printztn(ndo, bp, length, ndo->ndo_snapend);
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if (ui == 0)
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goto trunc;
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bp += ui;
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length -= ui;
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}
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break;
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case ACK:
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case DATA:
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if (length < 2)
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goto trunc; /* no block number */
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ND_PRINT(" block %u", GET_BE_U_2(bp));
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break;
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case TFTP_ERROR:
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/* Print error code string */
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if (length < 2)
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goto trunc; /* no error code */
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ND_PRINT(" %s", tok2str(err2str, "tftp-err-#%u \"",
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GET_BE_U_2(bp)));
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bp += 2;
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length -= 2;
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/* Print error message string */
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if (length == 0)
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goto trunc; /* no error message */
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ND_PRINT(" \"");
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ui = nd_printztn(ndo, bp, length, ndo->ndo_snapend);
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ND_PRINT("\"");
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if (ui == 0)
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goto trunc;
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break;
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default:
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/* We shouldn't get here */
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ND_PRINT("(unknown #%u)", opcode);
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break;
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}
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return;
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trunc:
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nd_print_trunc(ndo);
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}
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