X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/ed85e20e4d6a27d5405f37366dd34b64c10a9211..b51a0dafc7861eb31d21524ec067d7c529a664b8:/parsenfsfh.c diff --git a/parsenfsfh.c b/parsenfsfh.c index 826ca94e..cd943699 100644 --- a/parsenfsfh.c +++ b/parsenfsfh.c @@ -40,17 +40,19 @@ * Western Research Laboratory */ -#define NETDISSECT_REWORKED #ifdef HAVE_CONFIG_H -#include "config.h" +#include #endif -#include +#include "netdissect-stdinc.h" #include #include -#include "interface.h" +#include "netdissect-ctype.h" + +#include "netdissect.h" +#include "extract.h" #include "nfsfh.h" /* @@ -77,233 +79,215 @@ #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) ((uint32_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 *); +static int is_UCX(netdissect_options *, const unsigned char *, u_int); void -Parse_fh(register const unsigned char *fh, int len _U_, my_fsid *fsidp, - uint32_t *inop, +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 */ { - register const unsigned char *fhp = fh; + const unsigned char *fhp = fh; uint32_t temp; int fhtype = FHT_UNKNOWN; - int i; + u_int i; - if (ourself) { - /* File handle generated on this host, no need for guessing */ + /* + * 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; + fhtype = FHT_IRIX4; #endif #if defined(IRIX50) - fhtype = FHT_IRIX5; + fhtype = FHT_IRIX5; #endif #if defined(IRIX51) - fhtype = FHT_IRIX5; + fhtype = FHT_IRIX5; #endif #if defined(SUNOS4) - fhtype = FHT_SUNOS4; + fhtype = FHT_SUNOS4; #endif #if defined(SUNOS5) - fhtype = FHT_SUNOS5; + fhtype = FHT_SUNOS5; #endif #if defined(ultrix) - fhtype = FHT_ULTRIX; + fhtype = FHT_ULTRIX; #endif #if defined(__osf__) - fhtype = FHT_DECOSF; + 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; +#endif } - /*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 + * This is basically a big decision tree */ - 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 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 { /* - * 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. + * bytes[2,3] != (0,0); rules out Auspex, could be + * DECOSF, SUNOS4, or IRIX4 */ - fhtype = FHT_SUNOS5; /* or maybe IRIX5 */ + 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 { - if (is_UCX(fhp)) { - fhtype = FHT_VMSUCX; + /* + * 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 { - fhtype = FHT_UNKNOWN; + /* + * 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 = fhp[7]; - fsidp->Fsid_dev.Major = fhp[6]; + fsidp->Fsid_dev.Minor = GET_U_1(fhp + 7); + fsidp->Fsid_dev.Major = GET_U_1(fhp + 6); fsidp->fsid_code = 0; - *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); + *inop = GET_BE_U_4(fhp + 12); if (osnamep) *osnamep = "Auspex"; break; case FHT_BSD44: - fsidp->Fsid_dev.Minor = fhp[0]; - fsidp->Fsid_dev.Major = fhp[1]; + fsidp->Fsid_dev.Minor = GET_U_1(fhp); + fsidp->Fsid_dev.Major = GET_U_1(fhp + 1); fsidp->fsid_code = 0; - *inop = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]); + *inop = GET_LE_U_4(fhp + 12); if (osnamep) *osnamep = "BSD 4.4"; break; case FHT_DECOSF: - fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]); + fsidp->fsid_code = GET_LE_U_4(fhp + 4); /* XXX could ignore 3 high-order bytes */ - temp = make_uint32(fhp[3], fhp[2], fhp[1], fhp[0]); + temp = GET_LE_U_4(fhp); fsidp->Fsid_dev.Minor = temp & 0xFFFFF; fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF; - *inop = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]); + *inop = GET_LE_U_4(fhp + 12); if (osnamep) *osnamep = "OSF"; break; case FHT_IRIX4: - fsidp->Fsid_dev.Minor = fhp[3]; - fsidp->Fsid_dev.Major = fhp[2]; + fsidp->Fsid_dev.Minor = GET_U_1(fhp + 3); + fsidp->Fsid_dev.Major = GET_U_1(fhp + 2); fsidp->fsid_code = 0; - *inop = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]); + *inop = GET_BE_U_4(fhp + 8); 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]); + 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 = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); + *inop = GET_BE_U_4(fhp + 12); if (osnamep) *osnamep = "IRIX5"; @@ -321,24 +305,24 @@ Parse_fh(register const unsigned char *fh, int len _U_, my_fsid *fsidp, #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]); + 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 = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); + *inop = GET_BE_U_4(fhp + 12); if (osnamep) *osnamep = "SUNOS4"; break; case FHT_SUNOS5: - temp = make_uint16(fhp[0], fhp[1]); + temp = GET_BE_U_2(fhp); fsidp->Fsid_dev.Major = (temp>>2) & 0x3FFF; - temp = make_uint24(fhp[1], fhp[2], fhp[3]); + temp = GET_BE_U_3(fhp + 1); fsidp->Fsid_dev.Minor = temp & 0x3FFFF; - fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]); + fsidp->fsid_code = GET_BE_U_4(fhp + 4); - *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); + *inop = GET_BE_U_4(fhp + 12); if (osnamep) *osnamep = "SUNOS5"; @@ -346,10 +330,10 @@ Parse_fh(register const unsigned char *fh, int len _U_, my_fsid *fsidp, case FHT_ULTRIX: fsidp->fsid_code = 0; - fsidp->Fsid_dev.Minor = fhp[0]; - fsidp->Fsid_dev.Major = fhp[1]; + fsidp->Fsid_dev.Minor = GET_U_1(fhp); + fsidp->Fsid_dev.Major = GET_U_1(fhp + 1); - temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]); + temp = GET_LE_U_4(fhp + 4); *inop = temp; if (osnamep) *osnamep = "Ultrix"; @@ -361,47 +345,49 @@ Parse_fh(register const unsigned char *fh, int len _U_, my_fsid *fsidp, if (sizeof(*fsidp) > 14) memset((char *)fsidp, 0, sizeof(*fsidp)); /* just use the whole thing */ - memcpy((char *)fsidp, (char *)fh, 14); + 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, (char *)fh, 14); /* ensure alignment */ + 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 = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]); + *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 = (char *)&(fhp[1]); + *fsnamep = (const 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]); + 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 = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); + *inop = GET_BE_U_4(fhp + 12); 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.Major = GET_U_1(fhp); + temp = GET_BE_U_3(fhp + 1); fsidp->Fsid_dev.Minor = temp; - fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]); + fsidp->fsid_code = GET_BE_U_4(fhp + 4); - *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); + *inop = GET_BE_U_4(fhp + 12); if (osnamep) *osnamep = "HPUX9"; @@ -410,13 +396,15 @@ Parse_fh(register const unsigned char *fh, int len _U_, my_fsid *fsidp, case FHT_UNKNOWN: #ifdef DEBUG /* XXX debugging */ - for (i = 0; i < 32; i++) - (void)fprintf(stderr, "%x.", fhp[i]); + 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 < 32; i++) - (void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X", fhp[i]); + 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; @@ -443,19 +431,26 @@ Parse_fh(register const unsigned char *fh, int len _U_, my_fsid *fsidp, * (3) followed by string of nulls */ static int -is_UCX(const unsigned char *fhp) +is_UCX(netdissect_options *ndo, const unsigned char *fhp, u_int len) { - register int i; + 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(fhp[i])) { + if (ND_ASCII_ISPRINT(GET_U_1(fhp + i))) { if (seen_null) return(0); else continue; } - else if (fhp[i] == 0) { + else if (GET_U_1(fhp + i) == 0) { seen_null = 1; continue; }