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