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glibc/nss/getnssent_r.c
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/* Copyright (C) 2000-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 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 | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <errno.h> | |
#include <netdb.h> | |
#include "nsswitch.h" | |
/* Set up NIP to run through the services. If ALL is zero, use NIP's | |
current location if it's not nil. Return nonzero if there are no | |
services (left). */ | |
static int | |
setup (const char *func_name, db_lookup_function lookup_fct, | |
void **fctp, service_user **nip, service_user **startp, int all) | |
{ | |
int no_more; | |
if (*startp == NULL) | |
{ | |
no_more = lookup_fct (nip, func_name, NULL, fctp); | |
*startp = no_more ? (service_user *) -1l : *nip; | |
} | |
else if (*startp == (service_user *) -1l) | |
/* No services at all. */ | |
return 1; | |
else | |
{ | |
if (all || !*nip) | |
/* Reset to the beginning of the service list. */ | |
*nip = *startp; | |
/* Look up the first function. */ | |
no_more = __nss_lookup (nip, func_name, NULL, fctp); | |
} | |
return no_more; | |
} | |
void | |
__nss_setent (const char *func_name, db_lookup_function lookup_fct, | |
service_user **nip, service_user **startp, | |
service_user **last_nip, int stayopen, int *stayopen_tmp, | |
int res) | |
{ | |
union | |
{ | |
setent_function f; | |
void *ptr; | |
} fct; | |
int no_more; | |
if (res && __res_maybe_init (&_res, 0) == -1) | |
{ | |
__set_h_errno (NETDB_INTERNAL); | |
return; | |
} | |
/* Cycle through the services and run their `setXXent' functions until | |
we find an available service. */ | |
no_more = setup (func_name, lookup_fct, &fct.ptr, nip, | |
startp, 1); | |
while (! no_more) | |
{ | |
int is_last_nip = *nip == *last_nip; | |
enum nss_status status; | |
if (stayopen_tmp) | |
status = DL_CALL_FCT (fct.f, (*stayopen_tmp)); | |
else | |
status = DL_CALL_FCT (fct.f, (0)); | |
no_more = __nss_next2 (nip, func_name, NULL, &fct.ptr, status, 0); | |
if (is_last_nip) | |
*last_nip = *nip; | |
} | |
if (stayopen_tmp) | |
*stayopen_tmp = stayopen; | |
} | |
void | |
__nss_endent (const char *func_name, db_lookup_function lookup_fct, | |
service_user **nip, service_user **startp, | |
service_user **last_nip, int res) | |
{ | |
union | |
{ | |
endent_function f; | |
void *ptr; | |
} fct; | |
int no_more; | |
if (res && __res_maybe_init (&_res, 0) == -1) | |
{ | |
__set_h_errno (NETDB_INTERNAL); | |
return; | |
} | |
/* Cycle through all the services and run their endXXent functions. */ | |
no_more = setup (func_name, lookup_fct, &fct.ptr, nip, startp, 1); | |
while (! no_more) | |
{ | |
/* Ignore status, we force check in __NSS_NEXT. */ | |
DL_CALL_FCT (fct.f, ()); | |
if (*nip == *last_nip) | |
/* We have processed all services which were used. */ | |
break; | |
no_more = __nss_next2 (nip, func_name, NULL, &fct.ptr, 0, 1); | |
} | |
*last_nip = *nip = NULL; | |
} | |
int | |
__nss_getent_r (const char *getent_func_name, | |
const char *setent_func_name, | |
db_lookup_function lookup_fct, | |
service_user **nip, service_user **startp, | |
service_user **last_nip, int *stayopen_tmp, int res, | |
void *resbuf, char *buffer, size_t buflen, | |
void **result, int *h_errnop) | |
{ | |
union | |
{ | |
getent_function f; | |
void *ptr; | |
} fct; | |
int no_more; | |
enum nss_status status; | |
if (res && __res_maybe_init (&_res, 0) == -1) | |
{ | |
*h_errnop = NETDB_INTERNAL; | |
*result = NULL; | |
return errno; | |
} | |
/* Initialize status to return if no more functions are found. */ | |
status = NSS_STATUS_NOTFOUND; | |
/* Run through available functions, starting with the same function last | |
run. We will repeat each function as long as it succeeds, and then go | |
on to the next service action. */ | |
no_more = setup (getent_func_name, lookup_fct, &fct.ptr, nip, | |
startp, 0); | |
while (! no_more) | |
{ | |
int is_last_nip = *nip == *last_nip; | |
status = DL_CALL_FCT (fct.f, | |
(resbuf, buffer, buflen, &errno, &h_errno)); | |
/* The status is NSS_STATUS_TRYAGAIN and errno is ERANGE the | |
provided buffer is too small. In this case we should give | |
the user the possibility to enlarge the buffer and we should | |
not simply go on with the next service (even if the TRYAGAIN | |
action tells us so). */ | |
if (status == NSS_STATUS_TRYAGAIN | |
&& (h_errnop == NULL || *h_errnop == NETDB_INTERNAL) | |
&& errno == ERANGE) | |
break; | |
do | |
{ | |
no_more = __nss_next2 (nip, getent_func_name, NULL, &fct.ptr, | |
status, 0); | |
if (is_last_nip) | |
*last_nip = *nip; | |
if (! no_more) | |
{ | |
/* Call the `setXXent' function. This wasn't done before. */ | |
union | |
{ | |
setent_function f; | |
void *ptr; | |
} sfct; | |
no_more = __nss_lookup (nip, setent_func_name, NULL, &sfct.ptr); | |
if (! no_more) | |
{ | |
if (stayopen_tmp) | |
status = DL_CALL_FCT (sfct.f, (*stayopen_tmp)); | |
else | |
status = DL_CALL_FCT (sfct.f, (0)); | |
} | |
else | |
status = NSS_STATUS_NOTFOUND; | |
} | |
} | |
while (! no_more && status != NSS_STATUS_SUCCESS); | |
} | |
*result = status == NSS_STATUS_SUCCESS ? resbuf : NULL; | |
return (status == NSS_STATUS_SUCCESS ? 0 | |
: status != NSS_STATUS_TRYAGAIN ? ENOENT | |
/* h_errno functions only set errno if h_errno is NETDB_INTERNAL. */ | |
: (h_errnop == NULL || *h_errnop == NETDB_INTERNAL) ? errno | |
: EAGAIN); | |
} |