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winbind_nss_linux.c
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/*
Unix SMB/CIFS implementation.
Windows NT Domain nsswitch module
Copyright (C) Tim Potter 2000
This 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 3 of the License, or (at your option) any later version.
This 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 Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "winbind_client.h"
#if HAVE_PTHREAD_H
#include <pthread.h>
#endif
#if HAVE_PTHREAD
static pthread_mutex_t winbind_nss_mutex = PTHREAD_MUTEX_INITIALIZER;
#endif
/* Maximum number of users to pass back over the unix domain socket
per call. This is not a static limit on the total number of users
or groups returned in total. */
#define MAX_GETPWENT_USERS 250
#define MAX_GETGRENT_USERS 250
NSS_STATUS _nss_winbind_setpwent(void);
NSS_STATUS _nss_winbind_endpwent(void);
NSS_STATUS _nss_winbind_getpwent_r(struct passwd *result, char *buffer,
size_t buflen, int *errnop);
NSS_STATUS _nss_winbind_getpwuid_r(uid_t uid, struct passwd *result,
char *buffer, size_t buflen, int *errnop);
NSS_STATUS _nss_winbind_getpwnam_r(const char *name, struct passwd *result,
char *buffer, size_t buflen, int *errnop);
NSS_STATUS _nss_winbind_setgrent(void);
NSS_STATUS _nss_winbind_endgrent(void);
NSS_STATUS _nss_winbind_getgrent_r(struct group *result, char *buffer,
size_t buflen, int *errnop);
NSS_STATUS _nss_winbind_getgrlst_r(struct group *result, char *buffer,
size_t buflen, int *errnop);
NSS_STATUS _nss_winbind_getgrnam_r(const char *name, struct group *result,
char *buffer, size_t buflen, int *errnop);
NSS_STATUS _nss_winbind_getgrgid_r(gid_t gid, struct group *result, char *buffer,
size_t buflen, int *errnop);
NSS_STATUS _nss_winbind_initgroups_dyn(char *user, gid_t group, long int *start,
long int *size, gid_t **groups,
long int limit, int *errnop);
/*************************************************************************
************************************************************************/
#ifdef DEBUG_NSS
static const char *nss_err_str(NSS_STATUS ret)
{
switch (ret) {
case NSS_STATUS_TRYAGAIN:
return "NSS_STATUS_TRYAGAIN";
case NSS_STATUS_SUCCESS:
return "NSS_STATUS_SUCCESS";
case NSS_STATUS_NOTFOUND:
return "NSS_STATUS_NOTFOUND";
case NSS_STATUS_UNAVAIL:
return "NSS_STATUS_UNAVAIL";
#ifdef NSS_STATUS_RETURN
case NSS_STATUS_RETURN:
return "NSS_STATUS_RETURN";
#endif
default:
return "UNKNOWN RETURN CODE!!!!!!!";
}
}
#endif
/* Prototypes from wb_common.c */
/* Allocate some space from the nss static buffer. The buffer and buflen
are the pointers passed in by the C library to the _nss_ntdom_*
functions. */
static char *get_static(char **buffer, size_t *buflen, size_t len)
{
char *result;
/* Error check. We return false if things aren't set up right, or
there isn't enough buffer space left. */
if ((buffer == NULL) || (buflen == NULL) || (*buflen < len)) {
return NULL;
}
/* Return an index into the static buffer */
result = *buffer;
*buffer += len;
*buflen -= len;
return result;
}
/* I've copied the strtok() replacement function next_token_Xalloc() from
lib/util_str.c as I really don't want to have to link in any other
objects if I can possibly avoid it. */
static bool next_token_alloc(const char **ptr,
char **pp_buff,
const char *sep)
{
const char *s;
const char *saved_s;
char *pbuf;
bool quoted;
size_t len=1;
*pp_buff = NULL;
if (!ptr) {
return(false);
}
s = *ptr;
/* default to simple separators */
if (!sep) {
sep = " \t\n\r";
}
/* find the first non sep char */
while (*s && strchr(sep,*s)) {
s++;
}
/* nothing left? */
if (!*s) {
return false;
}
/* When restarting we need to go from here. */
saved_s = s;
/* Work out the length needed. */
for (quoted = false; *s &&
(quoted || !strchr(sep,*s)); s++) {
if (*s == '\"') {
quoted = !quoted;
} else {
len++;
}
}
/* We started with len = 1 so we have space for the nul. */
*pp_buff = (char *)malloc(len);
if (!*pp_buff) {
return false;
}
/* copy over the token */
pbuf = *pp_buff;
s = saved_s;
for (quoted = false; *s &&
(quoted || !strchr(sep,*s)); s++) {
if ( *s == '\"' ) {
quoted = !quoted;
} else {
*pbuf++ = *s;
}
}
*ptr = (*s) ? s+1 : s;
*pbuf = 0;
return true;
}
/* Fill a pwent structure from a winbindd_response structure. We use
the static data passed to us by libc to put strings and stuff in.
Return NSS_STATUS_TRYAGAIN if we run out of memory. */
static NSS_STATUS fill_pwent(struct passwd *result,
struct winbindd_pw *pw,
char **buffer, size_t *buflen)
{
/* User name */
if ((result->pw_name =
get_static(buffer, buflen, strlen(pw->pw_name) + 1)) == NULL) {
/* Out of memory */
return NSS_STATUS_TRYAGAIN;
}
strcpy(result->pw_name, pw->pw_name);
/* Password */
if ((result->pw_passwd =
get_static(buffer, buflen, strlen(pw->pw_passwd) + 1)) == NULL) {
/* Out of memory */
return NSS_STATUS_TRYAGAIN;
}
strcpy(result->pw_passwd, pw->pw_passwd);
/* [ug]id */
result->pw_uid = pw->pw_uid;
result->pw_gid = pw->pw_gid;
/* GECOS */
if ((result->pw_gecos =
get_static(buffer, buflen, strlen(pw->pw_gecos) + 1)) == NULL) {
/* Out of memory */
return NSS_STATUS_TRYAGAIN;
}
strcpy(result->pw_gecos, pw->pw_gecos);
/* Home directory */
if ((result->pw_dir =
get_static(buffer, buflen, strlen(pw->pw_dir) + 1)) == NULL) {
/* Out of memory */
return NSS_STATUS_TRYAGAIN;
}
strcpy(result->pw_dir, pw->pw_dir);
/* Logon shell */
if ((result->pw_shell =
get_static(buffer, buflen, strlen(pw->pw_shell) + 1)) == NULL) {
/* Out of memory */
return NSS_STATUS_TRYAGAIN;
}
strcpy(result->pw_shell, pw->pw_shell);
/* The struct passwd for Solaris has some extra fields which must
be initialised or nscd crashes. */
#if HAVE_PASSWD_PW_COMMENT
result->pw_comment = "";
#endif
#if HAVE_PASSWD_PW_AGE
result->pw_age = "";
#endif
return NSS_STATUS_SUCCESS;
}
/* Fill a grent structure from a winbindd_response structure. We use
the static data passed to us by libc to put strings and stuff in.
Return NSS_STATUS_TRYAGAIN if we run out of memory. */
static NSS_STATUS fill_grent(struct group *result, struct winbindd_gr *gr,
const char *gr_mem, char **buffer, size_t *buflen)
{
char *name;
int i;
char *tst;
/* Group name */
if ((result->gr_name =
get_static(buffer, buflen, strlen(gr->gr_name) + 1)) == NULL) {
/* Out of memory */
return NSS_STATUS_TRYAGAIN;
}
strcpy(result->gr_name, gr->gr_name);
/* Password */
if ((result->gr_passwd =
get_static(buffer, buflen, strlen(gr->gr_passwd) + 1)) == NULL) {
/* Out of memory */
return NSS_STATUS_TRYAGAIN;
}
strcpy(result->gr_passwd, gr->gr_passwd);
/* gid */
result->gr_gid = gr->gr_gid;
/* Group membership */
if (!gr_mem) {
gr->num_gr_mem = 0;
}
/* this next value is a pointer to a pointer so let's align it */
/* Calculate number of extra bytes needed to align on pointer size boundry */
if ((i = (unsigned long)(*buffer) % sizeof(char*)) != 0)
i = sizeof(char*) - i;
if ((tst = get_static(buffer, buflen, ((gr->num_gr_mem + 1) *
sizeof(char *)+i))) == NULL) {
/* Out of memory */
return NSS_STATUS_TRYAGAIN;
}
result->gr_mem = (char **)(tst + i);
if (gr->num_gr_mem == 0) {
/* Group is empty */
*(result->gr_mem) = NULL;
return NSS_STATUS_SUCCESS;
}
/* Start looking at extra data */
i = 0;
while(next_token_alloc((const char **)&gr_mem, &name, ",")) {
/* Allocate space for member */
if (((result->gr_mem)[i] =
get_static(buffer, buflen, strlen(name) + 1)) == NULL) {
free(name);
/* Out of memory */
return NSS_STATUS_TRYAGAIN;
}
strcpy((result->gr_mem)[i], name);
free(name);
i++;
}
/* Terminate list */
(result->gr_mem)[i] = NULL;
return NSS_STATUS_SUCCESS;
}
/*
* NSS user functions
*/
static struct winbindd_response getpwent_response;
static int ndx_pw_cache; /* Current index into pwd cache */
static int num_pw_cache; /* Current size of pwd cache */
/* Rewind "file pointer" to start of ntdom password database */
NSS_STATUS
_nss_winbind_setpwent(void)
{
NSS_STATUS ret;
#ifdef DEBUG_NSS
fprintf(stderr, "[%5d]: setpwent\n", getpid());
#endif
#if HAVE_PTHREAD
pthread_mutex_lock(&winbind_nss_mutex);
#endif
if (num_pw_cache > 0) {
ndx_pw_cache = num_pw_cache = 0;
winbindd_free_response(&getpwent_response);
}
ret = winbindd_request_response(NULL, WINBINDD_SETPWENT, NULL, NULL);
#ifdef DEBUG_NSS
fprintf(stderr, "[%5d]: setpwent returns %s (%d)\n", getpid(),
nss_err_str(ret), ret);
#endif
#if HAVE_PTHREAD
pthread_mutex_unlock(&winbind_nss_mutex);
#endif
return ret;
}
/* Close ntdom password database "file pointer" */
NSS_STATUS
_nss_winbind_endpwent(void)
{
NSS_STATUS ret;
#ifdef DEBUG_NSS
fprintf(stderr, "[%5d]: endpwent\n", getpid());
#endif
#if HAVE_PTHREAD
pthread_mutex_lock(&winbind_nss_mutex);
#endif
if (num_pw_cache > 0) {
ndx_pw_cache = num_pw_cache = 0;
winbindd_free_response(&getpwent_response);
}
ret = winbindd_request_response(NULL, WINBINDD_ENDPWENT, NULL, NULL);
#ifdef DEBUG_NSS
fprintf(stderr, "[%5d]: endpwent returns %s (%d)\n", getpid(),
nss_err_str(ret), ret);
#endif
#if HAVE_PTHREAD
pthread_mutex_unlock(&winbind_nss_mutex);
#endif
return ret;
}
/* Fetch the next password entry from ntdom password database */
NSS_STATUS
_nss_winbind_getpwent_r(struct passwd *result, char *buffer,
size_t buflen, int *errnop)
{
NSS_STATUS ret;
struct winbindd_request request;
static int called_again;
#ifdef DEBUG_NSS
fprintf(stderr, "[%5d]: getpwent\n", getpid());
#endif
#if HAVE_PTHREAD
pthread_mutex_lock(&winbind_nss_mutex);
#endif
/* Return an entry from the cache if we have one, or if we are
called again because we exceeded our static buffer. */
if ((ndx_pw_cache < num_pw_cache) || called_again) {
goto return_result;
}
/* Else call winbindd to get a bunch of entries */
if (num_pw_cache > 0) {
winbindd_free_response(&getpwent_response);
}
ZERO_STRUCT(request);
ZERO_STRUCT(getpwent_response);
request.data.num_entries = MAX_GETPWENT_USERS;
ret = winbindd_request_response(NULL, WINBINDD_GETPWENT, &request,
&getpwent_response);
if (ret == NSS_STATUS_SUCCESS) {
struct winbindd_pw *pw_cache;
/* Fill cache */
ndx_pw_cache = 0;
num_pw_cache = getpwent_response.data.num_entries;
/* Return a result */
return_result:
pw_cache = (struct winbindd_pw *)
getpwent_response.extra_data.data;
/* Check data is valid */
if (pw_cache == NULL) {
ret = NSS_STATUS_NOTFOUND;
goto done;
}
ret = fill_pwent(result, &pw_cache[ndx_pw_cache],
&buffer, &buflen);
/* Out of memory - try again */
if (ret == NSS_STATUS_TRYAGAIN) {
called_again = true;
*errnop = errno = ERANGE;
goto done;
}
*errnop = errno = 0;
called_again = false;
ndx_pw_cache++;
/* If we've finished with this lot of results free cache */
if (ndx_pw_cache == num_pw_cache) {
ndx_pw_cache = num_pw_cache = 0;
winbindd_free_response(&getpwent_response);
}
}
done:
#ifdef DEBUG_NSS
fprintf(stderr, "[%5d]: getpwent returns %s (%d)\n", getpid(),
nss_err_str(ret), ret);
#endif
#if HAVE_PTHREAD
pthread_mutex_unlock(&winbind_nss_mutex);
#endif
return ret;
}
/* Return passwd struct from uid */
NSS_STATUS
_nss_winbind_getpwuid_r(uid_t uid, struct passwd *result, char *buffer,
size_t buflen, int *errnop)
{
NSS_STATUS ret;
static struct winbindd_response response;
struct winbindd_request request;
static int keep_response;
#ifdef DEBUG_NSS
fprintf(stderr, "[%5d]: getpwuid_r %d\n", getpid(), (unsigned int)uid);
#endif
#if HAVE_PTHREAD
pthread_mutex_lock(&winbind_nss_mutex);
#endif
/* If our static buffer needs to be expanded we are called again */
if (!keep_response || uid != response.data.pw.pw_uid) {
/* Call for the first time */
ZERO_STRUCT(response);
ZERO_STRUCT(request);
request.data.uid = uid;
ret = winbindd_request_response(NULL, WINBINDD_GETPWUID, &request, &response);
if (ret == NSS_STATUS_SUCCESS) {
ret = fill_pwent(result, &response.data.pw,
&buffer, &buflen);
if (ret == NSS_STATUS_TRYAGAIN) {
keep_response = true;
*errnop = errno = ERANGE;
goto done;
}
}
} else {
/* We've been called again */
ret = fill_pwent(result, &response.data.pw, &buffer, &buflen);
if (ret == NSS_STATUS_TRYAGAIN) {
*errnop = errno = ERANGE;
goto done;
}
keep_response = false;
*errnop = errno = 0;
}
winbindd_free_response(&response);
done:
#ifdef DEBUG_NSS
fprintf(stderr, "[%5d]: getpwuid %d returns %s (%d)\n", getpid(),
(unsigned int)uid, nss_err_str(ret), ret);
#endif
#if HAVE_PTHREAD
pthread_mutex_unlock(&winbind_nss_mutex);
#endif
return ret;
}
/* Return passwd struct from username */
NSS_STATUS
_nss_winbind_getpwnam_r(const char *name, struct passwd *result, char *buffer,
size_t buflen, int *errnop)
{
NSS_STATUS ret;
static struct winbindd_response response;
struct winbindd_request request;
static int keep_response;
#ifdef DEBUG_NSS
fprintf(stderr, "[%5d]: getpwnam_r %s\n", getpid(), name);
#endif
#if HAVE_PTHREAD
pthread_mutex_lock(&winbind_nss_mutex);
#endif
/* If our static buffer needs to be expanded we are called again */
if (!keep_response || strcmp(name,response.data.pw.pw_name) != 0) {
/* Call for the first time */
ZERO_STRUCT(response);
ZERO_STRUCT(request);
strncpy(request.data.username, name,
sizeof(request.data.username) - 1);
request.data.username
[sizeof(request.data.username) - 1] = '\0';
ret = winbindd_request_response(NULL, WINBINDD_GETPWNAM, &request, &response);
if (ret == NSS_STATUS_SUCCESS) {
ret = fill_pwent(result, &response.data.pw, &buffer,
&buflen);
if (ret == NSS_STATUS_TRYAGAIN) {
keep_response = true;
*errnop = errno = ERANGE;
goto done;
}
}
} else {
/* We've been called again */
ret = fill_pwent(result, &response.data.pw, &buffer, &buflen);
if (ret == NSS_STATUS_TRYAGAIN) {
keep_response = true;
*errnop = errno = ERANGE;
goto done;
}
keep_response = false;
*errnop = errno = 0;
}
winbindd_free_response(&response);
done:
#ifdef DEBUG_NSS
fprintf(stderr, "[%5d]: getpwnam %s returns %s (%d)\n", getpid(),
name, nss_err_str(ret), ret);
#endif
#if HAVE_PTHREAD
pthread_mutex_unlock(&winbind_nss_mutex);
#endif
return ret;
}
/*
* NSS group functions
*/
static struct winbindd_response getgrent_response;
static int ndx_gr_cache; /* Current index into grp cache */
static int num_gr_cache; /* Current size of grp cache */
/* Rewind "file pointer" to start of ntdom group database */
NSS_STATUS
_nss_winbind_setgrent(void)
{
NSS_STATUS ret;
#ifdef DEBUG_NSS
fprintf(stderr, "[%5d]: setgrent\n", getpid());
#endif
#if HAVE_PTHREAD
pthread_mutex_lock(&winbind_nss_mutex);
#endif
if (num_gr_cache > 0) {
ndx_gr_cache = num_gr_cache = 0;
winbindd_free_response(&getgrent_response);
}
ret = winbindd_request_response(NULL, WINBINDD_SETGRENT, NULL, NULL);
#ifdef DEBUG_NSS
fprintf(stderr, "[%5d]: setgrent returns %s (%d)\n", getpid(),
nss_err_str(ret), ret);
#endif
#if HAVE_PTHREAD
pthread_mutex_unlock(&winbind_nss_mutex);
#endif
return ret;
}
/* Close "file pointer" for ntdom group database */
NSS_STATUS
_nss_winbind_endgrent(void)
{
NSS_STATUS ret;
#ifdef DEBUG_NSS
fprintf(stderr, "[%5d]: endgrent\n", getpid());
#endif
#if HAVE_PTHREAD
pthread_mutex_lock(&winbind_nss_mutex);
#endif
if (num_gr_cache > 0) {
ndx_gr_cache = num_gr_cache = 0;
winbindd_free_response(&getgrent_response);
}
ret = winbindd_request_response(NULL, WINBINDD_ENDGRENT, NULL, NULL);
#ifdef DEBUG_NSS
fprintf(stderr, "[%5d]: endgrent returns %s (%d)\n", getpid(),
nss_err_str(ret), ret);
#endif
#if HAVE_PTHREAD
pthread_mutex_unlock(&winbind_nss_mutex);
#endif
return ret;
}
/* Get next entry from ntdom group database */
static NSS_STATUS
winbind_getgrent(enum winbindd_cmd cmd,
struct group *result,
char *buffer, size_t buflen, int *errnop)
{
NSS_STATUS ret;
static struct winbindd_request request;
static int called_again;
#ifdef DEBUG_NSS
fprintf(stderr, "[%5d]: getgrent\n", getpid());
#endif
#if HAVE_PTHREAD
pthread_mutex_lock(&winbind_nss_mutex);
#endif
/* Return an entry from the cache if we have one, or if we are
called again because we exceeded our static buffer. */
if ((ndx_gr_cache < num_gr_cache) || called_again) {
goto return_result;
}
/* Else call winbindd to get a bunch of entries */
if (num_gr_cache > 0) {
winbindd_free_response(&getgrent_response);
}
ZERO_STRUCT(request);
ZERO_STRUCT(getgrent_response);
request.data.num_entries = MAX_GETGRENT_USERS;
ret = winbindd_request_response(NULL, cmd, &request,
&getgrent_response);
if (ret == NSS_STATUS_SUCCESS) {
struct winbindd_gr *gr_cache;
int mem_ofs;
/* Fill cache */
ndx_gr_cache = 0;
num_gr_cache = getgrent_response.data.num_entries;
/* Return a result */
return_result:
gr_cache = (struct winbindd_gr *)
getgrent_response.extra_data.data;
/* Check data is valid */
if (gr_cache == NULL) {
ret = NSS_STATUS_NOTFOUND;
goto done;
}
/* Fill group membership. The offset into the extra data
for the group membership is the reported offset plus the
size of all the winbindd_gr records returned. */
mem_ofs = gr_cache[ndx_gr_cache].gr_mem_ofs +
num_gr_cache * sizeof(struct winbindd_gr);
ret = fill_grent(result, &gr_cache[ndx_gr_cache],
((char *)getgrent_response.extra_data.data)+mem_ofs,
&buffer, &buflen);
/* Out of memory - try again */
if (ret == NSS_STATUS_TRYAGAIN) {
called_again = true;
*errnop = errno = ERANGE;
goto done;
}
*errnop = 0;
called_again = false;
ndx_gr_cache++;
/* If we've finished with this lot of results free cache */
if (ndx_gr_cache == num_gr_cache) {
ndx_gr_cache = num_gr_cache = 0;
winbindd_free_response(&getgrent_response);
}
}
done:
#ifdef DEBUG_NSS
fprintf(stderr, "[%5d]: getgrent returns %s (%d)\n", getpid(),
nss_err_str(ret), ret);
#endif
#if HAVE_PTHREAD
pthread_mutex_unlock(&winbind_nss_mutex);
#endif
return ret;
}
NSS_STATUS
_nss_winbind_getgrent_r(struct group *result,
char *buffer, size_t buflen, int *errnop)
{
return winbind_getgrent(WINBINDD_GETGRENT, result, buffer, buflen, errnop);
}
NSS_STATUS
_nss_winbind_getgrlst_r(struct group *result,
char *buffer, size_t buflen, int *errnop)
{
return winbind_getgrent(WINBINDD_GETGRLST, result, buffer, buflen, errnop);
}
/* Return group struct from group name */
NSS_STATUS
_nss_winbind_getgrnam_r(const char *name,
struct group *result, char *buffer,
size_t buflen, int *errnop)
{
NSS_STATUS ret;
static struct winbindd_response response;
struct winbindd_request request;
static int keep_response;
#ifdef DEBUG_NSS
fprintf(stderr, "[%5d]: getgrnam %s\n", getpid(), name);
#endif
#if HAVE_PTHREAD
pthread_mutex_lock(&winbind_nss_mutex);
#endif
/* If our static buffer needs to be expanded we are called again */
/* Or if the stored response group name differs from the request. */
if (!keep_response || strcmp(name,response.data.gr.gr_name) != 0) {
/* Call for the first time */
ZERO_STRUCT(request);
ZERO_STRUCT(response);
strncpy(request.data.groupname, name,
sizeof(request.data.groupname));
request.data.groupname
[sizeof(request.data.groupname) - 1] = '\0';
ret = winbindd_request_response(NULL, WINBINDD_GETGRNAM,
&request, &response);
if (ret == NSS_STATUS_SUCCESS) {
ret = fill_grent(result, &response.data.gr,
(char *)response.extra_data.data,
&buffer, &buflen);
if (ret == NSS_STATUS_TRYAGAIN) {
keep_response = true;
*errnop = errno = ERANGE;
goto done;
}
}
} else {
/* We've been called again */
ret = fill_grent(result, &response.data.gr,
(char *)response.extra_data.data, &buffer,
&buflen);
if (ret == NSS_STATUS_TRYAGAIN) {
keep_response = true;
*errnop = errno = ERANGE;
goto done;
}
keep_response = false;
*errnop = 0;
}
winbindd_free_response(&response);
done:
#ifdef DEBUG_NSS
fprintf(stderr, "[%5d]: getgrnam %s returns %s (%d)\n", getpid(),
name, nss_err_str(ret), ret);
#endif
#if HAVE_PTHREAD
pthread_mutex_unlock(&winbind_nss_mutex);
#endif
return ret;
}
/* Return group struct from gid */
NSS_STATUS
_nss_winbind_getgrgid_r(gid_t gid,
struct group *result, char *buffer,
size_t buflen, int *errnop)
{
NSS_STATUS ret;
static struct winbindd_response response;
struct winbindd_request request;
static int keep_response;
#ifdef DEBUG_NSS
fprintf(stderr, "[%5d]: getgrgid %d\n", getpid(), gid);
#endif
#if HAVE_PTHREAD
pthread_mutex_lock(&winbind_nss_mutex);
#endif
/* If our static buffer needs to be expanded we are called again */
/* Or if the stored response group name differs from the request. */
if (!keep_response || gid != response.data.gr.gr_gid) {
/* Call for the first time */
ZERO_STRUCT(request);
ZERO_STRUCT(response);
request.data.gid = gid;
ret = winbindd_request_response(NULL, WINBINDD_GETGRGID,
&request, &response);
if (ret == NSS_STATUS_SUCCESS) {
ret = fill_grent(result, &response.data.gr,
(char *)response.extra_data.data,
&buffer, &buflen);
if (ret == NSS_STATUS_TRYAGAIN) {
keep_response = true;
*errnop = errno = ERANGE;
goto done;
}