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259 lines
7.1 KiB
C
259 lines
7.1 KiB
C
/* Copyright (C) 2000-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <netdb.h>
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#include "nsswitch.h"
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#include <resolv/resolv_context.h>
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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 int
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setup (const char *func_name, db_lookup_function lookup_fct,
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void **fctp, nss_action_list *nip, nss_action_list *startp, int all)
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{
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int no_more;
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if (*startp == NULL || all)
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{
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no_more = lookup_fct (nip, func_name, NULL, fctp);
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*startp = no_more ? (nss_action_list) -1l : *nip;
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}
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else if (*startp == (nss_action_list) -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 (!*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, NULL, 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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__nss_setent (const char *func_name, db_lookup_function lookup_fct,
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nss_action_list *nip, nss_action_list *startp,
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nss_action_list *last_nip, int stayopen, int *stayopen_tmp,
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int res)
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{
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union
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{
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setent_function f;
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void *ptr;
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} fct;
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int no_more;
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struct resolv_context *res_ctx = NULL;
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if (res)
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{
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res_ctx = __resolv_context_get ();
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if (res_ctx == NULL)
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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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}
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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 (func_name, lookup_fct, &fct.ptr, nip,
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startp, 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;
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if (stayopen_tmp)
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status = DL_CALL_FCT (fct.f, (*stayopen_tmp));
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else
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status = DL_CALL_FCT (fct.f, (0));
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/* This is a special-case. When [SUCCESS=merge] is in play,
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_nss_next2() will skip to the next database. Due to the
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implementation of that function, we can't know whether we're
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in an enumeration or an individual lookup, which behaves
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differently with regards to merging. We'll treat SUCCESS as
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an indication to start the enumeration at this database. */
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if (nss_next_action (*nip, status) == NSS_ACTION_MERGE)
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no_more = 1;
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else
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no_more = __nss_next2 (nip, func_name, NULL, &fct.ptr, 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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__resolv_context_put (res_ctx);
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if (stayopen_tmp)
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*stayopen_tmp = stayopen;
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}
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void
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__nss_endent (const char *func_name, db_lookup_function lookup_fct,
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nss_action_list *nip, nss_action_list *startp,
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nss_action_list *last_nip, int res)
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{
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union
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{
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endent_function f;
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void *ptr;
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} fct;
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int no_more;
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struct resolv_context *res_ctx = NULL;
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if (res)
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{
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res_ctx = __resolv_context_get ();
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if (res_ctx == NULL)
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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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}
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/* Cycle through all the services and run their endXXent functions. */
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no_more = setup (func_name, lookup_fct, &fct.ptr, nip, startp, 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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DL_CALL_FCT (fct.f, ());
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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_next2 (nip, func_name, NULL, &fct.ptr, 0, 1);
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}
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*last_nip = *nip = NULL;
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__resolv_context_put (res_ctx);
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}
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int
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__nss_getent_r (const char *getent_func_name,
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const char *setent_func_name,
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db_lookup_function lookup_fct,
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nss_action_list *nip, nss_action_list *startp,
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nss_action_list *last_nip, int *stayopen_tmp, int res,
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void *resbuf, char *buffer, size_t buflen,
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void **result, int *h_errnop)
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{
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union
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{
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getent_function f;
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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;
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struct resolv_context *res_ctx = NULL;
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if (res)
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{
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res_ctx = __resolv_context_get ();
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if (res_ctx == NULL)
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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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}
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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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/* 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 (getent_func_name, lookup_fct, &fct.ptr, nip,
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startp, 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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status = DL_CALL_FCT (fct.f,
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(resbuf, buffer, buflen, &errno, &h_errno));
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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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&& (h_errnop == NULL || *h_errnop == NETDB_INTERNAL)
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&& errno == ERANGE)
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break;
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do
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{
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/* This is a special-case. When [SUCCESS=merge] is in play,
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_nss_next2() will skip to the next database. Due to the
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implementation of that function, we can't know whether we're
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in an enumeration or an individual lookup, which behaves
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differently with regards to merging. We'll treat SUCCESS as
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an indication to return the results here. */
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if (status == NSS_STATUS_SUCCESS
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&& nss_next_action (*nip, status) == NSS_ACTION_MERGE)
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no_more = 1;
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else
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no_more = __nss_next2 (nip, getent_func_name, NULL, &fct.ptr,
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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)
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{
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/* Call the `setXXent' function. This wasn't done before. */
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union
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{
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setent_function f;
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void *ptr;
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} sfct;
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no_more = __nss_lookup (nip, setent_func_name, NULL, &sfct.ptr);
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if (! no_more)
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{
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if (stayopen_tmp)
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status = DL_CALL_FCT (sfct.f, (*stayopen_tmp));
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else
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status = DL_CALL_FCT (sfct.f, (0));
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}
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else
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status = NSS_STATUS_NOTFOUND;
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}
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}
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while (! no_more && status != NSS_STATUS_SUCCESS);
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}
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__resolv_context_put (res_ctx);
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*result = status == NSS_STATUS_SUCCESS ? resbuf : NULL;
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return (status == NSS_STATUS_SUCCESS ? 0
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: status != NSS_STATUS_TRYAGAIN ? ENOENT
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/* h_errno functions only set errno if h_errno is NETDB_INTERNAL. */
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: (h_errnop == NULL || *h_errnop == NETDB_INTERNAL) ? errno
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: EAGAIN);
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}
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