diff options
Diffstat (limited to 'nis/nis_cache.c')
| -rw-r--r-- | nis/nis_cache.c | 307 |
1 files changed, 0 insertions, 307 deletions
diff --git a/nis/nis_cache.c b/nis/nis_cache.c deleted file mode 100644 index e10b8c07fd..0000000000 --- a/nis/nis_cache.c +++ /dev/null @@ -1,307 +0,0 @@ -/* Copyright (C) 1997 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Library General Public License as - published by the Free Software Foundation; either version 2 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Library General Public License for more details. - - You should have received a copy of the GNU Library General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#include <fcntl.h> -#include <unistd.h> -#include <syslog.h> -#include <string.h> -#include <sys/stat.h> -#include <sys/mman.h> -#include <rpcsvc/nis.h> -#include <rpcsvc/nis_cache.h> -#include <bits/libc-lock.h> - -#include "nis_intern.h" - -static struct timeval TIMEOUT = {10, 0}; - -#define HEADER_MAGIC 0x07021971 -#define SPACER_MAGIC 0x07654321 - -#define CACHE_VERSION 0x00000001 - -struct cache_header -{ - u_long magic; /* Magic number */ - u_long vers; /* Cache file format version */ - u_short tcp_port; /* tcp port of nis_cachemgr */ - u_short udp_port; /* udp port of nis_cachemgr */ - u_long entries; /* Number of cached objs. */ - off_t used; /* How many space are used ? */ -}; -typedef struct cache_header cache_header; - -struct cache_spacer -{ - u_long magic; /* Magic number */ - u_long hashval; - time_t ctime; /* time we have created this object */ - time_t ttl; /* time to life of this object */ - off_t next_offset; -}; -typedef struct cache_spacer cache_spacer; - -static int cache_fd = -1; -static int clnt_sock; -static caddr_t maddr = NULL; -static size_t msize; -static CLIENT *cache_clnt = NULL; - -/* If there is no cachemgr, we shouldn't use NIS_SHARED_DIRCACHE, if - there is no NIS_SHARED_DIRCACHE, we couldn't use nis_cachemgr. - So, if the clnt_call to nis_cachemgr fails, we also close the cache file. - But another thread could read the cache => lock the cache_fd and cache_clnt - variables with the same lock */ -__libc_lock_define_initialized (static, mgrlock) - -/* close file handles and nis_cachemgr connection */ -static void -__cache_close (void) -{ - if (cache_fd != -1) - { - close (cache_fd); - cache_fd = -1; - } - if (cache_clnt != NULL) - { - clnt_destroy (cache_clnt); - close (clnt_sock); - cache_clnt = NULL; - } -} - -/* open the cache file and connect to nis_cachemgr */ -static bool_t -__cache_open (void) -{ - struct sockaddr_in sin; - cache_header hptr; - - if ((cache_fd = open (CACHEFILE, O_RDONLY)) == -1) - return FALSE; - - if (read (cache_fd, &hptr, sizeof (cache_header)) == -1 - || lseek (cache_fd, 0, SEEK_SET) < 0) - { - close (cache_fd); - cache_fd = -1; - return FALSE; - } - if (hptr.magic != HEADER_MAGIC) - { - close (cache_fd); - cache_fd = -1; - syslog (LOG_ERR, _("NIS+: cache file is corrupt!")); - return FALSE; - } - - memset (&sin, '\0', sizeof (sin)); - sin.sin_family = AF_INET; - clnt_sock = RPC_ANYSOCK; - sin.sin_addr.s_addr = htonl (INADDR_LOOPBACK); - sin.sin_port = htons (hptr.tcp_port); - cache_clnt = clnttcp_create (&sin, CACHEPROG, CACHE_VER_1, &clnt_sock, 0, 0); - if (cache_clnt == NULL) - { - close (cache_fd); - cache_fd = -1; - return FALSE; - } - /* If the program exists, close the socket */ - if (fcntl (clnt_sock, F_SETFD, FD_CLOEXEC) == -1) - perror (_("fcntl: F_SETFD")); - return TRUE; -} - -/* Ask the cache manager to update directory 'name' - for us (because the ttl has expired). */ -static nis_error -__cache_refresh (nis_name name) -{ - char clnt_res = 0; - nis_error result = NIS_SUCCESS; - - __libc_lock_lock (mgrlock); - - if (cache_clnt == NULL) - result = NIS_FAIL; - else if (clnt_call (cache_clnt, NIS_CACHE_REFRESH_ENTRY, - (xdrproc_t) xdr_wrapstring, (caddr_t) &name, - (xdrproc_t) xdr_void, &clnt_res, TIMEOUT) - != RPC_SUCCESS) - { - __cache_close (); - result = NIS_FAIL; - } - - __libc_lock_unlock (mgrlock); - - return result; -} - -static nis_error -__cache_find (const_nis_name name, directory_obj **obj) -{ - unsigned long hash; - struct cache_header *hptr; - struct cache_spacer *cs; - struct directory_obj *dir; - XDR xdrs; - caddr_t addr, ptr; - time_t now = time (NULL); - - if (maddr == NULL) - return NIS_FAIL; - - hash = __nis_hash (name, strlen(name)); - hptr = (cache_header *)maddr; - if ((hptr->magic != HEADER_MAGIC) || (hptr->vers != CACHE_VERSION)) - { - syslog (LOG_ERR, _("NIS+: cache file is corrupt!")); - return NIS_SYSTEMERROR; - } - cs = (cache_spacer *)(maddr + sizeof (cache_header)); - while (cs->next_offset) - { - if (cs->magic != SPACER_MAGIC) - { - syslog (LOG_ERR, _("NIS+: cache file is corrupt!")); - return NIS_SYSTEMERROR; - } - if (cs->hashval == hash) - { - if ((now - cs->ctime) > cs->ttl) - return NIS_CACHEEXPIRED; - dir = calloc (1, sizeof (directory_obj)); - addr = (caddr_t)cs + sizeof (cache_spacer); - xdrmem_create (&xdrs, addr, cs->next_offset, XDR_DECODE); - xdr_directory_obj (&xdrs, dir); - xdr_destroy (&xdrs); - *obj = dir; - return NIS_SUCCESS; - } - ptr = (caddr_t)cs; - ptr += cs->next_offset + sizeof (struct cache_spacer); - cs = (struct cache_spacer *)ptr; - } - return NIS_NOTFOUND; -} - -static directory_obj * -internal_cache_search (const_nis_name name) -{ - directory_obj *dir; - nis_error res; - int second_refresh = 0; - struct stat s; - - if (cache_fd == -1) - if (__cache_open () == FALSE) - return NULL; - - again: - /* This lock is for nis_cachemgr, so it couldn't write a new cache - file if we reading it */ - if (__nis_lock_cache () == -1) - return NULL; - - if (maddr != NULL) - munmap (maddr, msize); - if (fstat (cache_fd, &s) < 0) - maddr = MAP_FAILED; - else - { - msize = s.st_size; - maddr = mmap (0, msize, PROT_READ, MAP_SHARED, cache_fd, 0); - } - if (maddr == MAP_FAILED) - { - __nis_unlock_cache (); - return NULL; - } - - res = __cache_find (name, &dir); - - munmap (maddr, msize); - maddr = NULL; - /* Allow nis_cachemgr to write a new cachefile */ - __nis_unlock_cache (); - - switch(res) - { - case NIS_CACHEEXPIRED: - if (second_refresh) - { - __cache_close (); - syslog (LOG_WARNING, - _("NIS+: nis_cachemgr failed to refresh object for us")); - return NULL; - } - ++second_refresh; - if (__cache_refresh ((char *) name) != NIS_SUCCESS) - return NULL; - goto again; - break; - case NIS_SUCCESS: - return dir; - default: - return NULL; - } -} - -directory_obj * -__cache_search (const_nis_name name) -{ - directory_obj *dir; - - __libc_lock_lock (mgrlock); - - dir = internal_cache_search (name); - - __libc_lock_unlock (mgrlock); - - return dir; -} - -nis_error -__cache_add (fd_result *fd) -{ - char clnt_res = 0; - nis_error result = NIS_SUCCESS; - - __libc_lock_lock (mgrlock); - - if (cache_clnt == NULL) - if (__cache_open () == FALSE) - result = NIS_FAIL; - - if (cache_clnt != NULL && - (clnt_call (cache_clnt, NIS_CACHE_ADD_ENTRY, (xdrproc_t) xdr_fd_result, - (caddr_t)fd, (xdrproc_t) xdr_void, &clnt_res, TIMEOUT) - != RPC_SUCCESS)) - { - __cache_close (); - result = NIS_RPCERROR; - } - - __libc_lock_unlock (mgrlock); - - return result; -} |