mirror of
https://github.com/the-tcpdump-group/tcpdump.git
synced 2024-12-13 03:44:53 +08:00
ee68aa3646
The exceptions are currently: Some EXTRACT_ in print-juniper.c, not used on packet buffer pointer. An EXTRACT_BE_U_3 in addrtoname.c, not always used on packet buffer pointer.
461 lines
12 KiB
C
461 lines
12 KiB
C
/*
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* Copyright (c) 1993, 1994 Jeffrey C. Mogul, Digital Equipment Corporation,
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* Western Research Laboratory. All rights reserved.
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* Copyright (c) 2001 Compaq Computer Corporation. All rights reserved.
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*
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* Permission to use, copy, and modify this software and its
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* documentation is hereby granted only under the following terms and
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* conditions. Both the above copyright notice and this permission
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* notice must appear in all copies of the software, derivative works
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* or modified versions, and any portions thereof, and both notices
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* must appear in supporting documentation.
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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 the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND COMPAQ COMPUTER CORPORATION
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* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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* ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
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* EVENT SHALL COMPAQ COMPUTER CORPORATION BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
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* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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/*
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* parsenfsfh.c - portable parser for NFS file handles
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* uses all sorts of heuristics
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*
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* Jeffrey C. Mogul
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* Digital Equipment Corporation
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* Western Research Laboratory
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*/
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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 <stdio.h>
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#include <string.h>
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#include "netdissect.h"
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#include "extract.h"
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#include "nfsfh.h"
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/*
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* This routine attempts to parse a file handle (in network byte order),
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* using heuristics to guess what kind of format it is in. See the
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* file "fhandle_layouts" for a detailed description of the various
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* patterns we know about.
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*
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* The file handle is parsed into our internal representation of a
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* file-system id, and an internal representation of an inode-number.
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*/
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#define FHT_UNKNOWN 0
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#define FHT_AUSPEX 1
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#define FHT_DECOSF 2
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#define FHT_IRIX4 3
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#define FHT_IRIX5 4
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#define FHT_SUNOS3 5
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#define FHT_SUNOS4 6
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#define FHT_ULTRIX 7
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#define FHT_VMSUCX 8
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#define FHT_SUNOS5 9
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#define FHT_AIX32 10
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#define FHT_HPUX9 11
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#define FHT_BSD44 12
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static int is_UCX(netdissect_options *, const unsigned char *, u_int);
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void
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Parse_fh(netdissect_options *ndo, const unsigned char *fh, u_int len,
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my_fsid *fsidp, uint32_t *inop,
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const char **osnamep, /* if non-NULL, return OS name here */
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const char **fsnamep, /* if non-NULL, return server fs name here (for VMS) */
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int ourself) /* true if file handle was generated on this host */
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{
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const unsigned char *fhp = fh;
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uint32_t temp;
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int fhtype = FHT_UNKNOWN;
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u_int i;
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/*
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* Require at least 16 bytes of file handle; it's variable-length
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* in NFSv3. "len" is in units of 32-bit words, not bytes.
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*/
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if (len < 16/4)
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fhtype = FHT_UNKNOWN;
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else {
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if (ourself) {
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/* File handle generated on this host, no need for guessing */
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#if defined(IRIX40)
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fhtype = FHT_IRIX4;
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#endif
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#if defined(IRIX50)
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fhtype = FHT_IRIX5;
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#endif
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#if defined(IRIX51)
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fhtype = FHT_IRIX5;
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#endif
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#if defined(SUNOS4)
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fhtype = FHT_SUNOS4;
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#endif
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#if defined(SUNOS5)
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fhtype = FHT_SUNOS5;
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#endif
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#if defined(ultrix)
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fhtype = FHT_ULTRIX;
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#endif
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#if defined(__osf__)
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fhtype = FHT_DECOSF;
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#endif
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#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) \
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|| defined(__OpenBSD__)
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fhtype = FHT_BSD44;
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#endif
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}
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/*
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* This is basically a big decision tree
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*/
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else if ((GET_U_1(fhp) == 0) && (GET_U_1(fhp + 1) == 0)) {
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/* bytes[0,1] == (0,0); rules out Ultrix, IRIX5, SUNOS5 */
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/* probably rules out HP-UX, AIX unless they allow major=0 */
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if ((GET_U_1(fhp + 2) == 0) && (GET_U_1(fhp + 3) == 0)) {
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/* bytes[2,3] == (0,0); must be Auspex */
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/* XXX or could be Ultrix+MASSBUS "hp" disk? */
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fhtype = FHT_AUSPEX;
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}
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else {
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/*
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* bytes[2,3] != (0,0); rules out Auspex, could be
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* DECOSF, SUNOS4, or IRIX4
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*/
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if ((GET_U_1(fhp + 4) != 0) && (GET_U_1(fhp + 5) == 0) &&
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(GET_U_1(fhp + 8) == 12) && (GET_U_1(fhp + 9) == 0)) {
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/* seems to be DECOSF, with minor == 0 */
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fhtype = FHT_DECOSF;
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}
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else {
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/* could be SUNOS4 or IRIX4 */
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/* XXX the test of fhp[5] == 8 could be wrong */
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if ((GET_U_1(fhp + 4) == 0) && (GET_U_1(fhp + 5) == 8) && (GET_U_1(fhp + 6) == 0) &&
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(GET_U_1(fhp + 7) == 0)) {
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/* looks like a length, not a file system typecode */
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fhtype = FHT_IRIX4;
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}
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else {
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/* by elimination */
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fhtype = FHT_SUNOS4;
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}
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}
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}
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}
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else {
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/*
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* bytes[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4
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* could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5
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* could be AIX, HP-UX
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*/
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if ((GET_U_1(fhp + 2) == 0) && (GET_U_1(fhp + 3) == 0)) {
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/*
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* bytes[2,3] == (0,0); rules out OSF, probably not UCX
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* (unless the exported device name is just one letter!),
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* could be Ultrix, IRIX5, AIX, or SUNOS5
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* might be HP-UX (depends on their values for minor devs)
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*/
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if ((GET_U_1(fhp + 6) == 0) && (GET_U_1(fhp + 7) == 0)) {
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fhtype = FHT_BSD44;
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}
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/*XXX we probably only need to test of these two bytes */
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else if ((len >= 24/4) && (GET_U_1(fhp + 21) == 0) && (GET_U_1(fhp + 23) == 0)) {
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fhtype = FHT_ULTRIX;
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}
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else {
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/* Could be SUNOS5/IRIX5, maybe AIX */
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/* XXX no obvious difference between SUNOS5 and IRIX5 */
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if (GET_U_1(fhp + 9) == 10)
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fhtype = FHT_SUNOS5;
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/* XXX what about AIX? */
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}
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}
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else {
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/*
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* bytes[2,3] != (0,0); rules out Ultrix, could be
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* DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX
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*/
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if ((GET_U_1(fhp + 8) == 12) && (GET_U_1(fhp + 9) == 0)) {
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fhtype = FHT_DECOSF;
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}
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else if ((GET_U_1(fhp + 8) == 0) && (GET_U_1(fhp + 9) == 10)) {
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/* could be SUNOS5/IRIX5, AIX, HP-UX */
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if ((GET_U_1(fhp + 7) == 0) && (GET_U_1(fhp + 6) == 0) &&
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(GET_U_1(fhp + 5) == 0) && (GET_U_1(fhp + 4) == 0)) {
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/* XXX is this always true of HP-UX? */
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fhtype = FHT_HPUX9;
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}
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else if (GET_U_1(fhp + 7) == 2) {
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/* This would be MNT_NFS on AIX, which is impossible */
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fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
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}
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else {
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/*
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* XXX Could be SUNOS5/IRIX5 or AIX. I don't
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* XXX see any way to disambiguate these, so
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* XXX I'm going with the more likely guess.
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* XXX Sorry, Big Blue.
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*/
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fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
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}
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}
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else {
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if (is_UCX(ndo, fhp, len)) {
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fhtype = FHT_VMSUCX;
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}
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else {
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fhtype = FHT_UNKNOWN;
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}
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}
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}
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}
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}
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/* XXX still needs to handle SUNOS3 */
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switch (fhtype) {
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case FHT_AUSPEX:
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fsidp->Fsid_dev.Minor = GET_U_1(fhp + 7);
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fsidp->Fsid_dev.Major = GET_U_1(fhp + 6);
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fsidp->fsid_code = 0;
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*inop = GET_BE_U_4(fhp + 12);
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if (osnamep)
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*osnamep = "Auspex";
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break;
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case FHT_BSD44:
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fsidp->Fsid_dev.Minor = GET_U_1(fhp);
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fsidp->Fsid_dev.Major = GET_U_1(fhp + 1);
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fsidp->fsid_code = 0;
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*inop = GET_LE_U_4(fhp + 12);
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if (osnamep)
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*osnamep = "BSD 4.4";
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break;
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case FHT_DECOSF:
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fsidp->fsid_code = GET_LE_U_4(fhp + 4);
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/* XXX could ignore 3 high-order bytes */
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temp = GET_LE_U_4(fhp);
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fsidp->Fsid_dev.Minor = temp & 0xFFFFF;
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fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF;
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*inop = GET_LE_U_4(fhp + 12);
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if (osnamep)
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*osnamep = "OSF";
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break;
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case FHT_IRIX4:
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fsidp->Fsid_dev.Minor = GET_U_1(fhp + 3);
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fsidp->Fsid_dev.Major = GET_U_1(fhp + 2);
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fsidp->fsid_code = 0;
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*inop = GET_BE_U_4(fhp + 8);
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if (osnamep)
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*osnamep = "IRIX4";
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break;
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case FHT_IRIX5:
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fsidp->Fsid_dev.Minor = GET_BE_U_2(fhp + 2);
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fsidp->Fsid_dev.Major = GET_BE_U_2(fhp);
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fsidp->fsid_code = GET_BE_U_4(fhp + 4);
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*inop = GET_BE_U_4(fhp + 12);
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if (osnamep)
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*osnamep = "IRIX5";
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break;
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#ifdef notdef
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case FHT_SUNOS3:
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/*
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* XXX - none of the heuristics above return this.
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* Are there any SunOS 3.x systems around to care about?
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*/
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if (osnamep)
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*osnamep = "SUNOS3";
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break;
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#endif
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case FHT_SUNOS4:
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fsidp->Fsid_dev.Minor = GET_U_1(fhp + 3);
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fsidp->Fsid_dev.Major = GET_U_1(fhp + 2);
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fsidp->fsid_code = GET_BE_U_4(fhp + 4);
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*inop = GET_BE_U_4(fhp + 12);
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if (osnamep)
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*osnamep = "SUNOS4";
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break;
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case FHT_SUNOS5:
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temp = GET_BE_U_2(fhp);
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fsidp->Fsid_dev.Major = (temp>>2) & 0x3FFF;
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temp = GET_BE_U_3(fhp + 1);
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fsidp->Fsid_dev.Minor = temp & 0x3FFFF;
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fsidp->fsid_code = GET_BE_U_4(fhp + 4);
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*inop = GET_BE_U_4(fhp + 12);
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if (osnamep)
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*osnamep = "SUNOS5";
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break;
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case FHT_ULTRIX:
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fsidp->fsid_code = 0;
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fsidp->Fsid_dev.Minor = GET_U_1(fhp);
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fsidp->Fsid_dev.Major = GET_U_1(fhp + 1);
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temp = GET_LE_U_4(fhp + 4);
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*inop = temp;
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if (osnamep)
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*osnamep = "Ultrix";
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break;
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case FHT_VMSUCX:
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/* No numeric file system ID, so hash on the device-name */
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if (sizeof(*fsidp) >= 14) {
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if (sizeof(*fsidp) > 14)
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memset((char *)fsidp, 0, sizeof(*fsidp));
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/* just use the whole thing */
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memcpy((char *)fsidp, (const char *)fh, 14);
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}
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else {
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uint32_t tempa[4]; /* at least 16 bytes, maybe more */
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memset((char *)tempa, 0, sizeof(tempa));
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memcpy((char *)tempa, (const char *)fh, 14); /* ensure alignment */
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fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1);
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fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1);
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fsidp->fsid_code = 0;
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}
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/* VMS file ID is: (RVN, FidHi, FidLo) */
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*inop = (((uint32_t) GET_U_1(fhp + 26)) << 24) |
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(((uint32_t) GET_U_1(fhp + 27)) << 16) |
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(GET_LE_U_2(fhp + 22) << 0);
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/* Caller must save (and null-terminate?) this value */
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if (fsnamep)
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*fsnamep = (const char *)(fhp + 1);
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if (osnamep)
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*osnamep = "VMS";
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break;
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case FHT_AIX32:
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fsidp->Fsid_dev.Minor = GET_BE_U_2(fhp + 2);
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fsidp->Fsid_dev.Major = GET_BE_U_2(fhp);
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fsidp->fsid_code = GET_BE_U_4(fhp + 4);
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*inop = GET_BE_U_4(fhp + 12);
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if (osnamep)
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*osnamep = "AIX32";
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break;
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case FHT_HPUX9:
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fsidp->Fsid_dev.Major = GET_U_1(fhp);
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temp = GET_BE_U_3(fhp + 1);
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fsidp->Fsid_dev.Minor = temp;
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fsidp->fsid_code = GET_BE_U_4(fhp + 4);
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*inop = GET_BE_U_4(fhp + 12);
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if (osnamep)
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*osnamep = "HPUX9";
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break;
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case FHT_UNKNOWN:
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#ifdef DEBUG
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/* XXX debugging */
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for (i = 0; i < len*4; i++)
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(void)fprintf(stderr, "%x.", GET_U_1(fhp + i));
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(void)fprintf(stderr, "\n");
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#endif
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/* Save the actual handle, so it can be display with -u */
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for (i = 0; i < len*4 && i*2 < sizeof(fsidp->Opaque_Handle) - 1; i++)
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(void)nd_snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X",
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GET_U_1(fhp + i));
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fsidp->Opaque_Handle[i*2] = '\0';
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/* XXX for now, give "bogus" values to aid debugging */
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fsidp->fsid_code = 0;
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fsidp->Fsid_dev.Minor = 257;
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fsidp->Fsid_dev.Major = 257;
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*inop = 1;
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/* display will show this string instead of (257,257) */
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if (fsnamep)
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*fsnamep = "Unknown";
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if (osnamep)
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*osnamep = "Unknown";
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break;
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}
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}
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/*
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* Is this a VMS UCX file handle?
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* Check for:
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* (1) leading code byte [XXX not yet]
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* (2) followed by string of printing chars & spaces
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* (3) followed by string of nulls
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*/
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static int
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is_UCX(netdissect_options *ndo, const unsigned char *fhp, u_int len)
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{
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u_int i;
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int seen_null = 0;
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/*
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* Require at least 28 bytes of file handle; it's variable-length
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* in NFSv3. "len" is in units of 32-bit words, not bytes.
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*/
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if (len < 28/4)
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return(0);
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for (i = 1; i < 14; i++) {
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if (ND_ISPRINT(GET_U_1(fhp + i))) {
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if (seen_null)
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return(0);
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else
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continue;
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}
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else if (GET_U_1(fhp + i) == 0) {
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seen_null = 1;
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continue;
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}
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else
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return(0);
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}
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return(1);
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}
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