/* $NetBSD: parsenfsfh.c,v 1.7 2006/03/25 11:43:53 rpaulo Exp $ */ /* * 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 */ #include #ifndef lint #if 0 static const char rcsid[] _U_ = "@(#) Header: /tcpdump/master/tcpdump/parsenfsfh.c,v 1.25.2.2 2003/11/16 08:51:07 guy Exp (LBL)"; #else __RCSID("$NetBSD: parsenfsfh.c,v 1.7 2006/03/25 11:43:53 rpaulo Exp $"); #endif #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include "interface.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 #ifdef ultrix /* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */ #define XFF(x) ((u_int32_t)(x)) #else #define XFF(x) (x) #endif #define make_uint32(msb,b,c,lsb)\ (XFF(lsb) + (XFF(c)<<8) + (XFF(b)<<16) + (XFF(msb)<<24)) #define make_uint24(msb,b, lsb)\ (XFF(lsb) + (XFF(b)<<8) + (XFF(msb)<<16)) #define make_uint16(msb,lsb)\ (XFF(lsb) + (XFF(msb)<<8)) #ifdef __alpha /* or other 64-bit systems */ #define make_uint48(msb,b,c,d,e,lsb)\ ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24) + ((b)<<32) + ((msb)<<40)) #else /* on 32-bit systems ignore high-order bits */ #define make_uint48(msb,b,c,d,e,lsb)\ ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24)) #endif static int is_UCX(const unsigned char *); void Parse_fh(fh, len, fsidp, inop, osnamep, fsnamep, ourself) register const unsigned char *fh; int len; my_fsid *fsidp; ino_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 */ { register const unsigned char *fhp = fh; u_int32_t temp; int fhtype = FHT_UNKNOWN; int i; 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 ((fhp[0] == 0) && (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 ((fhp[2] == 0) && (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 ((fhp[4] != 0) && (fhp[5] == 0) && (fhp[8] == 12) && (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 ((fhp[4] == 0) && (fhp[5] == 8) && (fhp[6] == 0) && (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 ((fhp[2] == 0) && (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 ((fhp[6] == 0) && (fhp[7] == 0)) { fhtype = FHT_BSD44; } /*XXX we probably only need to test of these two bytes */ else if ((fhp[21] == 0) && (fhp[23] == 0)) { fhtype = FHT_ULTRIX; } else { /* Could be SUNOS5/IRIX5, maybe AIX */ /* XXX no obvious difference between SUNOS5 and IRIX5 */ if (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 ((fhp[8] == 12) && (fhp[9] == 0)) { fhtype = FHT_DECOSF; } else if ((fhp[8] == 0) && (fhp[9] == 10)) { /* could be SUNOS5/IRIX5, AIX, HP-UX */ if ((fhp[7] == 0) && (fhp[6] == 0) && (fhp[5] == 0) && (fhp[4] == 0)) { /* XXX is this always true of HP-UX? */ fhtype = FHT_HPUX9; } else if (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(fhp)) { fhtype = FHT_VMSUCX; } else { fhtype = FHT_UNKNOWN; } } } } /* XXX still needs to handle SUNOS3 */ switch (fhtype) { case FHT_AUSPEX: fsidp->Fsid_dev.Minor = fhp[7]; fsidp->Fsid_dev.Major = fhp[6]; fsidp->fsid_code = 0; temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); *inop = temp; if (osnamep) *osnamep = "Auspex"; break; case FHT_BSD44: fsidp->Fsid_dev.Minor = fhp[0]; fsidp->Fsid_dev.Major = fhp[1]; fsidp->fsid_code = 0; temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]); *inop = temp; if (osnamep) *osnamep = "BSD 4.4"; break; case FHT_DECOSF: fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]); /* XXX could ignore 3 high-order bytes */ temp = make_uint32(fhp[3], fhp[2], fhp[1], fhp[0]); fsidp->Fsid_dev.Minor = temp & 0xFFFFF; fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF; temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]); *inop = temp; if (osnamep) *osnamep = "OSF"; break; case FHT_IRIX4: fsidp->Fsid_dev.Minor = fhp[3]; fsidp->Fsid_dev.Major = fhp[2]; fsidp->fsid_code = 0; temp = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]); *inop = temp; if (osnamep) *osnamep = "IRIX4"; break; case FHT_IRIX5: fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]); fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]); fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]); temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); *inop = temp; if (osnamep) *osnamep = "IRIX5"; break; #ifdef notdef case FHT_SUNOS3: if (osnamep) *osnamep = "SUNOS3"; break; #endif case FHT_SUNOS4: fsidp->Fsid_dev.Minor = fhp[3]; fsidp->Fsid_dev.Major = fhp[2]; fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]); temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); *inop = temp; if (osnamep) *osnamep = "SUNOS4"; break; case FHT_SUNOS5: temp = make_uint16(fhp[0], fhp[1]); fsidp->Fsid_dev.Major = (temp>>2) & 0x3FFF; temp = make_uint24(fhp[1], fhp[2], fhp[3]); fsidp->Fsid_dev.Minor = temp & 0x3FFFF; fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]); temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); *inop = temp; if (osnamep) *osnamep = "SUNOS5"; break; case FHT_ULTRIX: fsidp->fsid_code = 0; fsidp->Fsid_dev.Minor = fhp[0]; fsidp->Fsid_dev.Major = fhp[1]; temp = make_uint32(fhp[7], fhp[6], fhp[5], 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, (char *)fh, 14); } else { u_int32_t tempa[4]; /* at least 16 bytes, maybe more */ memset((char *)tempa, 0, sizeof(tempa)); memcpy((char *)tempa, (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 = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]); /* Caller must save (and null-terminate?) this value */ if (fsnamep) *fsnamep = (char *)&(fhp[1]); if (osnamep) *osnamep = "VMS"; break; case FHT_AIX32: fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]); fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]); fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]); temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); *inop = temp; if (osnamep) *osnamep = "AIX32"; break; case FHT_HPUX9: fsidp->Fsid_dev.Major = fhp[0]; temp = make_uint24(fhp[1], fhp[2], fhp[3]); fsidp->Fsid_dev.Minor = temp; fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]); temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); *inop = temp; if (osnamep) *osnamep = "HPUX9"; break; case FHT_UNKNOWN: #ifdef DEBUG /* XXX debugging */ for (i = 0; i < 32; i++) (void)fprintf(stderr, "%x.", fhp[i]); (void)fprintf(stderr, "\n"); #endif /* Save the actual handle, so it can be display with -u */ for (i = 0; i < 32; i++) (void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X", fhp[i]); /* 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(fhp) const unsigned char *fhp; { register int i; int seen_null = 0; for (i = 1; i < 14; i++) { if (isprint(fhp[i])) { if (seen_null) return(0); else continue; } else if (fhp[i] == 0) { seen_null = 1; continue; } else return(0); } return(1); }