293 lines
8.2 KiB
C
293 lines
8.2 KiB
C
/* Copyright (C) 1996-2002, 2003, 2004 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <assert.h>
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#include <errno.h>
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#include <stdbool.h>
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#include "nsswitch.h"
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#ifdef USE_NSCD
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# include <nscd/nscd_proto.h>
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#endif
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#ifdef NEED__RES_HCONF
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# include <resolv/res_hconf.h>
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#endif
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#ifdef NEED__RES
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# include <resolv.h>
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#endif
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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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|* FUNCTION_NAME - name of the non-reentrant 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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|* ADD_PARAMS - additional parameter, can vary in number *|
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|* *|
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|* ADD_VARIABLES - names of additional parameter *|
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|* *|
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|* Optionally the following vars can be defined: *|
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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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|* NEED__RES - the global _res variable might be used so we *|
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|* will have to initialize it if necessary *|
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|* *|
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|* PREPROCESS - code run before anything else *|
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|* *|
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|* POSTPROCESS - code run after the lookup *|
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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_NAME APPEND_R (FUNCTION_NAME)
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#define APPEND_R(name) APPEND_R1 (name)
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#define APPEND_R1(name) name##_r
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#define INTERNAL(name) INTERNAL1 (name)
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#define INTERNAL1(name) __##name
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#define NEW(name) NEW1 (name)
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#define NEW1(name) __new_##name
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#ifdef USE_NSCD
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# define NSCD_NAME ADD_NSCD (REENTRANT_NAME)
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# define ADD_NSCD(name) ADD_NSCD1 (name)
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# define ADD_NSCD1(name) __nscd_##name
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# define NOT_USENSCD_NAME ADD_NOT_NSCDUSE (DATABASE_NAME)
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# define ADD_NOT_NSCDUSE(name) ADD_NOT_NSCDUSE1 (name)
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# define ADD_NOT_NSCDUSE1(name) __nss_not_use_nscd_##name
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#endif
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#define FUNCTION_NAME_STRING STRINGIZE (FUNCTION_NAME)
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#define REENTRANT_NAME_STRING STRINGIZE (REENTRANT_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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#ifndef DB_LOOKUP_FCT
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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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#endif
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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_errnop
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# define H_ERRNO_VAR_P h_errnop
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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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# define H_ERRNO_VAR_P NULL
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#endif
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#ifdef HAVE_AF
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# define AF_VAL af
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#else
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# define AF_VAL AF_INET
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#endif
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/* Type of the lookup function we need here. */
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typedef enum nss_status (*lookup_function) (ADD_PARAMS, LOOKUP_TYPE *, char *,
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size_t, int * H_ERRNO_PARM);
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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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internal_function;
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libc_hidden_proto (DB_LOOKUP_FCT)
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int
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INTERNAL (REENTRANT_NAME) (ADD_PARAMS, LOOKUP_TYPE *resbuf, char *buffer,
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size_t buflen, LOOKUP_TYPE **result H_ERRNO_PARM)
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{
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static service_user *startp;
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static lookup_function start_fct;
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service_user *nip;
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union
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{
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lookup_function l;
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void *ptr;
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} fct;
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int no_more;
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enum nss_status status = NSS_STATUS_UNAVAIL;
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#ifdef USE_NSCD
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int nscd_status;
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#endif
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#ifdef NEED_H_ERRNO
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bool any_service = false;
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#endif
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#ifdef PREPROCESS
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PREPROCESS;
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#endif
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#ifdef HANDLE_DIGITS_DOTS
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switch (__nss_hostname_digits_dots (name, resbuf, &buffer, NULL,
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buflen, result, &status, AF_VAL,
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H_ERRNO_VAR_P))
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{
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case -1:
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return errno;
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case 1:
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goto done;
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}
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#endif
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#ifdef USE_NSCD
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if (NOT_USENSCD_NAME > 0 && ++NOT_USENSCD_NAME > NSS_NSCD_RETRY)
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NOT_USENSCD_NAME = 0;
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if (!NOT_USENSCD_NAME)
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{
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nscd_status = NSCD_NAME (ADD_VARIABLES, resbuf, buffer, buflen, result
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H_ERRNO_VAR);
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if (nscd_status >= 0)
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return nscd_status;
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}
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#endif
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if (startp == NULL)
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{
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no_more = DB_LOOKUP_FCT (&nip, REENTRANT_NAME_STRING, &fct.ptr);
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if (no_more)
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startp = (service_user *) -1l;
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else
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{
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startp = nip;
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start_fct = fct.l;
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#ifdef NEED__RES
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/* The resolver code will really be used so we have to
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initialize it. */
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if (__res_maybe_init (&_res, 0) == -1)
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{
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*h_errnop = NETDB_INTERNAL;
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*result = NULL;
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return errno;
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}
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#endif /* need _res */
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#ifdef NEED__RES_HCONF
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if (!_res_hconf.initialized)
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_res_hconf_init ();
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#endif /* need _res_hconf */
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}
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}
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else
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{
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fct.l = start_fct;
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no_more = (nip = startp) == (service_user *) -1l;
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}
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while (no_more == 0)
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{
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#ifdef NEED_H_ERRNO
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any_service = true;
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#endif
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status = DL_CALL_FCT (fct.l, (ADD_VARIABLES, resbuf, buffer, buflen,
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&errno H_ERRNO_VAR));
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/* The status is NSS_STATUS_TRYAGAIN and errno is ERANGE the
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provided buffer is too small. In this case we should give
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the user the possibility to enlarge the buffer and we should
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not simply go on with the next service (even if the TRYAGAIN
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action tells us so). */
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if (status == NSS_STATUS_TRYAGAIN
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#ifdef NEED_H_ERRNO
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&& *h_errnop == NETDB_INTERNAL
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#endif
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&& errno == ERANGE)
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break;
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no_more = __nss_next (&nip, REENTRANT_NAME_STRING,
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&fct.ptr, status, 0);
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}
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#ifdef HANDLE_DIGITS_DOTS
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done:
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#endif
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*result = status == NSS_STATUS_SUCCESS ? resbuf : NULL;
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#ifdef NEED_H_ERRNO
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if (status != NSS_STATUS_SUCCESS && ! any_service)
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/* We were not able to use any service. */
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*h_errnop = NO_RECOVERY;
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#endif
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#ifdef POSTPROCESS
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POSTPROCESS;
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#endif
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int res;
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if (status == NSS_STATUS_SUCCESS || status == NSS_STATUS_NOTFOUND)
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res = 0;
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/* Don't pass back ERANGE if this is not for a too-small buffer. */
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else if (errno == ERANGE && status != NSS_STATUS_TRYAGAIN)
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res = EINVAL;
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#ifdef NEED_H_ERRNO
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/* These functions only set errno if h_errno is NETDB_INTERNAL. */
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else if (status == NSS_STATUS_TRYAGAIN && *h_errnop != NETDB_INTERNAL)
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res = EAGAIN;
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#endif
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else
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return errno;
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__set_errno (res);
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return res;
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}
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#include <shlib-compat.h>
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#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1_2)
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#define OLD(name) OLD1 (name)
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#define OLD1(name) __old_##name
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int
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attribute_compat_text_section
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OLD (REENTRANT_NAME) (ADD_PARAMS, LOOKUP_TYPE *resbuf, char *buffer,
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size_t buflen, LOOKUP_TYPE **result H_ERRNO_PARM)
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{
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int ret = INTERNAL (REENTRANT_NAME) (ADD_VARIABLES, resbuf, buffer,
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buflen, result H_ERRNO_VAR);
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if (ret != 0 || result == NULL)
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ret = -1;
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return ret;
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}
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#define do_symbol_version(real, name, version) \
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compat_symbol (libc, real, name, version)
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do_symbol_version (OLD (REENTRANT_NAME), REENTRANT_NAME, GLIBC_2_0);
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#endif
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/* As INTERNAL (REENTRANT_NAME) may be hidden, we need an alias
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in between so that the REENTRANT_NAME@@GLIBC_2.1.2 is not
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hidden too. */
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strong_alias (INTERNAL (REENTRANT_NAME), NEW (REENTRANT_NAME));
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#define do_default_symbol_version(real, name, version) \
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versioned_symbol (libc, real, name, version)
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do_default_symbol_version (NEW (REENTRANT_NAME),
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REENTRANT_NAME, GLIBC_2_1_2);
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static_link_warning (REENTRANT_NAME)
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