diff options
| -rw-r--r-- | nfs/nfs.c | 41 |
1 files changed, 31 insertions, 10 deletions
@@ -1,4 +1,4 @@ -/* +/* XDR frobbing and lower level routines for NFS client Copyright (C) 1995, 1996 Free Software Foundation, Inc. Written by Michael I. Bushnell, p/BSG. @@ -24,7 +24,7 @@ #include <netinet/in.h> #include <stdio.h> -/* Convert an NFS mode to a Hurd mode */ +/* Convert an NFS mode (TYPE and MODE) to a Hurd mode and return it. */ mode_t nfs_mode_to_hurd_mode (int type, int mode) { @@ -77,10 +77,12 @@ hurd_mode_to_nfs_mode (mode_t mode) return mode & 07777; } -/* Each of these functions copies its second arg to *P, converting it - to XDR representation along the way. They then return the address after - the copied value. */ + +/* Each of the functions on this page copies its second arg to *P, + converting it to XDR representation along the way. They then + return the address after the copied value. */ +/* Encode an NFS file handle. */ int * xdr_encode_fhandle (int *p, void *fhandle) { @@ -88,6 +90,7 @@ xdr_encode_fhandle (int *p, void *fhandle) return p + INTSIZE (NFS_FHSIZE); } +/* Encode uninterpreted bytes. */ int * xdr_encode_data (int *p, char *data, size_t len) { @@ -99,14 +102,14 @@ xdr_encode_data (int *p, char *data, size_t len) return p + nints; } +/* Encode a C string. */ int * xdr_encode_string (int *p, char *string) { return xdr_encode_data (p, string, strlen (string)); } -/* The SATTR calls are different; they each only fill in one - or two attributes; the rest get -1. */ +/* Encode a MODE into an otherwise empty sattr. */ int * xdr_encode_sattr_mode (int *p, mode_t mode) { @@ -121,6 +124,7 @@ xdr_encode_sattr_mode (int *p, mode_t mode) return p; } +/* Encode UID and GID into an otherwise empty sattr. */ int * xdr_encode_sattr_ids (int *p, u_int uid, u_int gid) { @@ -135,6 +139,7 @@ xdr_encode_sattr_ids (int *p, u_int uid, u_int gid) return p; } +/* Encode a file size into an otherwise empty sattr. */ int * xdr_encode_sattr_size (int *p, off_t size) { @@ -149,6 +154,7 @@ xdr_encode_sattr_size (int *p, off_t size) return p; } +/* Encode ATIME and MTIME into an otherwise empty sattr. */ int * xdr_encode_sattr_times (int *p, struct timespec *atime, struct timespec *mtime) { @@ -163,6 +169,7 @@ xdr_encode_sattr_times (int *p, struct timespec *atime, struct timespec *mtime) return p; } +/* Encode MODE and a size of 0 into an otherwise empty sattr. */ int * xdr_encode_create_state (int *p, mode_t mode) @@ -178,6 +185,7 @@ xdr_encode_create_state (int *p, return p; } +/* Encode ST into an sattr. */ int * xdr_encode_sattr_stat (int *p, struct stat *st) @@ -192,9 +200,10 @@ xdr_encode_sattr_stat (int *p, *p++ = htonl (st->st_mtime_usec); return p; } + /* Decode *P into a stat structure; return the address of the - following data. */ + following data. */ int * xdr_decode_fattr (int *p, struct stat *st) { @@ -210,7 +219,7 @@ xdr_decode_fattr (int *p, struct stat *st) st->st_blksize = ntohl (*p++); st->st_rdev = ntohl (*p++); st->st_blocks = ntohl (*p++); - st->st_fsid = ntohl (*p++); /* surely wrong */ + st->st_fsid = ntohl (*p++); st->st_ino = ntohl (*p++); st->st_atime = ntohl (*p++); st->st_atime_usec = ntohl (*p++); @@ -236,7 +245,15 @@ xdr_decode_string (int *p, char *buf) return p + INTSIZE (len); } - + +/* Set up an RPC for procedure RPC_PROC for talking to the NFS server. + Allocate storage with malloc and point *BUFP at it; caller must + free this when done. Initialize RPC credential information with + information from CRED (identifying the user making this call; -1 + means superuser), NP (identifying the node we are operating on), and + SECOND_GID (specifying another GID the server might be interested + in). Allocate at least LEN bytes of space for bulk data in + addition to the normal amount for an RPC. */ int * nfs_initialize_rpc (int rpc_proc, struct netcred *cred, size_t len, void **bufp, struct node *np, @@ -246,6 +263,9 @@ nfs_initialize_rpc (int rpc_proc, struct netcred *cred, uid_t gid; error_t err; + /* Use heuristics to figure out what ids to present to the server. + Don't lie, but adjust ids as necessary to secure the desired result. */ + if (cred == (struct netcred *) -1) { uid = gid = 0; @@ -323,6 +343,7 @@ nfs_initialize_rpc (int rpc_proc, struct netcred *cred, uid, gid, second_gid); } +/* ERROR is an NFS error code; return the correspending Hurd error. */ error_t nfs_error_trans (int error) { |