279 lines
8.1 KiB
C
279 lines
8.1 KiB
C
/* Copyright (C) 1996 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <libc-lock.h>
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#include "nsswitch.h"
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/*******************************************************************\
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|* Here we assume several symbols to be defined: *|
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|* *|
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|* LOOKUP_TYPE - the return type of the function *|
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|* *|
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|* SETFUNC_NAME - name of the non-reentrant setXXXent function *|
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|* *|
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|* GETFUNC_NAME - name of the non-reentrant getXXXent function *|
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|* *|
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|* ENDFUNC_NAME - name of the non-reentrant endXXXent function *|
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|* *|
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|* DATABASE_NAME - name of the database the function accesses *|
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|* (e.g., host, services, ...) *|
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|* *|
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|* Optionally the following vars can be defined: *|
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|* *|
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|* STAYOPEN - variable declaration for setXXXent function *|
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|* *|
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|* STAYOPEN_VAR - variable name for setXXXent function *|
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|* *|
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|* NEED_H_ERRNO - an extra parameter will be passed to point to *|
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|* the global `h_errno' variable. *|
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|* *|
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\*******************************************************************/
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/* To make the real sources a bit prettier. */
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#define REENTRANT_GETNAME APPEND_R (GETFUNC_NAME)
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#define APPEND_R(Name) CONCAT2_2 (Name, _r)
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#define INTERNAL(Name) CONCAT2_2 (__, Name)
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#define CONCAT2_1(Pre, Post) CONCAT2_2 (Pre, Post)
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#define CONCAT2_2(Pre, Post) Pre##Post
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#define SETFUNC_NAME_STRING STRINGIZE (SETFUNC_NAME)
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#define GETFUNC_NAME_STRING STRINGIZE (REENTRANT_GETNAME)
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#define ENDFUNC_NAME_STRING STRINGIZE (ENDFUNC_NAME)
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#define DATABASE_NAME_STRING STRINGIZE (DATABASE_NAME)
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#define STRINGIZE(Name) STRINGIZE1 (Name)
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#define STRINGIZE1(Name) #Name
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#define DB_LOOKUP_FCT CONCAT3_1 (__nss_, DATABASE_NAME, _lookup)
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#define CONCAT3_1(Pre, Name, Post) CONCAT3_2 (Pre, Name, Post)
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#define CONCAT3_2(Pre, Name, Post) Pre##Name##Post
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/* Sometimes we need to store error codes in the `h_errno' variable. */
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#ifdef NEED_H_ERRNO
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# define H_ERRNO_PARM , int *h_errnop
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# define H_ERRNO_VAR , &h_errno
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#else
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# define H_ERRNO_PARM
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# define H_ERRNO_VAR
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#endif
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/* Some databases take the `stayopen' flag. */
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#ifdef STAYOPEN
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# define STAYOPEN_TMP CONCAT2_1 (STAYOPEN, _tmp)
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# define STAYOPEN_TMPVAR CONCAT2_1 (STAYOPEN_VAR, _tmp)
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#else
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# define STAYOPEN void
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# define STAYOPEN_VAR
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# define STAYOPEN_TMPVAR
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#endif
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/* Prototype for the setXXXent functions we use here. */
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typedef int (*set_function) (STAYOPEN);
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/* Prototype for the endXXXent functions we use here. */
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typedef int (*end_function) (void);
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/* Prototype for the setXXXent functions we use here. */
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typedef int (*get_function) (LOOKUP_TYPE *, char *, size_t H_ERRNO_PARM);
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/* This handle for the NSS data base is shared between all
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set/get/endXXXent functions. */
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static service_user *nip;
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/* Remember the last service used since the last call to `endXXent'. */
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static service_user *last_nip;
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/* Remember the first service_entry, it's always the same. */
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static service_user *startp;
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#ifdef STAYOPEN_TMP
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/* We need to remember the last `stayopen' flag given by the user
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since the `setent' function is only called for the first available
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service. */
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static STAYOPEN_TMP;
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#endif
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/* Protect above variable against multiple uses at the same time. */
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__libc_lock_define_initialized (static, lock)
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/* The lookup function for the first entry of this service. */
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extern int DB_LOOKUP_FCT (service_user **nip, const char *name, void **fctp);
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/* Set up NIP to run through the services. If ALL is zero, use NIP's
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current location if it's not nil. Return nonzero if there are no
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services (left). */
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static enum nss_status
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setup (void **fctp, const char *func_name, int all)
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{
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int no_more;
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if (startp == NULL)
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{
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no_more = DB_LOOKUP_FCT (&nip, func_name, fctp);
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startp = no_more ? (service_user *) -1l : nip;
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}
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else if (startp == (service_user *) -1l)
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/* No services at all. */
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return 1;
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else
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{
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if (all || !nip)
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/* Reset to the beginning of the service list. */
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nip = startp;
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/* Look up the first function. */
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no_more = __nss_lookup (&nip, func_name, fctp);
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}
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return no_more;
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}
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void
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SETFUNC_NAME (STAYOPEN)
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{
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set_function fct;
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int no_more;
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#ifdef NEED__RES
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if ((_res.options & RES_INIT) == 0 && res_init () == -1)
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{
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__set_h_errno (NETDB_INTERNAL);
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return;
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}
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#endif /* need _res */
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__libc_lock_lock (lock);
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/* Cycle through the services and run their `setXXent' functions until
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we find an available service. */
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no_more = setup ((void **) &fct, SETFUNC_NAME_STRING, 1);
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while (! no_more)
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{
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int is_last_nip = nip == last_nip;
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enum nss_status status = (*fct) (STAYOPEN_VAR);
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no_more = __nss_next (&nip, SETFUNC_NAME_STRING, (void **) &fct,
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status, 0);
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if (is_last_nip)
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last_nip = nip;
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}
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#ifdef STAYOPEN_TMP
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STAYOPEN_TMPVAR = STAYOPEN_VAR;
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#endif
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__libc_lock_unlock (lock);
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}
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void
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ENDFUNC_NAME (void)
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{
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end_function fct;
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int no_more;
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#ifdef NEED__RES
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if ((_res.options & RES_INIT) == 0 && res_init () == -1)
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{
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__set_h_errno (NETDB_INTERNAL);
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return;
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}
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#endif /* need _res */
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__libc_lock_lock (lock);
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/* Cycle through all the services and run their endXXent functions. */
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no_more = setup ((void **) &fct, ENDFUNC_NAME_STRING, 1);
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while (! no_more)
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{
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/* Ignore status, we force check in __NSS_NEXT. */
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(void) (*fct) ();
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if (nip == last_nip)
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/* We have processed all services which were used. */
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break;
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no_more = __nss_next (&nip, ENDFUNC_NAME_STRING, (void **) &fct, 0, 1);
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}
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last_nip = nip = NULL;
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__libc_lock_unlock (lock);
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}
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int
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INTERNAL (REENTRANT_GETNAME) (LOOKUP_TYPE *resbuf, char *buffer, size_t buflen,
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LOOKUP_TYPE **result H_ERRNO_PARM)
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{
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get_function fct;
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int no_more;
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enum nss_status status;
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#ifdef NEED__RES
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if ((_res.options & RES_INIT) == 0 && res_init () == -1)
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{
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__set_h_errno (NETDB_INTERNAL);
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*result = NULL;
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return -1;
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}
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#endif /* need _res */
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/* Initialize status to return if no more functions are found. */
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status = NSS_STATUS_NOTFOUND;
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__libc_lock_lock (lock);
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/* Run through available functions, starting with the same function last
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run. We will repeat each function as long as it succeeds, and then go
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on to the next service action. */
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no_more = setup ((void **) &fct, GETFUNC_NAME_STRING, 0);
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while (! no_more)
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{
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int is_last_nip = nip == last_nip;
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service_user *current_nip = nip;
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status = (*fct) (resbuf, buffer, buflen H_ERRNO_VAR);
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no_more = __nss_next (&nip, GETFUNC_NAME_STRING, (void **) &fct,
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status, 0);
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if (is_last_nip)
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last_nip = nip;
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if (! no_more && current_nip != nip)
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/* Call the `setXXent' function. This wasn't done before. */
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do
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{
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set_function sfct;
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no_more = __nss_lookup (&nip, SETFUNC_NAME_STRING,
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(void **) &sfct);
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if (! no_more)
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status = (*sfct) (STAYOPEN_TMPVAR);
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else
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status = NSS_STATUS_NOTFOUND;
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}
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while (! no_more && status != NSS_STATUS_SUCCESS);
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}
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__libc_lock_unlock (lock);
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*result = status == NSS_STATUS_SUCCESS ? resbuf : NULL;
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return status == NSS_STATUS_SUCCESS ? 0 : -1;
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}
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#define do_weak_alias(n1, n2) weak_alias (n1, n2)
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do_weak_alias (INTERNAL (REENTRANT_GETNAME), REENTRANT_GETNAME)
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