| /* |
| * 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.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)nd_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_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); |
| } |