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/*
NSS module which calls glibc's user and group lookup functions again
DO NOT USE THIS IN /etc/nsswitch.conf, it will cause an infinite loop.
The main use case is to run proxy provider tests with cwrap's nss-wrapper.
The proxy provider loads the NSS modules directly with dlopen() and is not
using glibc's NSS mechanism. Since nss-wrapper just wraps the standard
glibc calls and does not provide an NSS module on its own we have to use
this workaround to make proxy provider work with nss-wrapper.
Authors:
Sumit Bose <sbose@redhat.com>
Copyright (c) 2023 Red Hat, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define _DEFAULT_SOURCE
#define _GNU_SOURCE
#include <stdlib.h>
#include <nss.h>
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
#define NSSRET(r) return (((r) == 0) ? NSS_STATUS_SUCCESS : NSS_STATUS_NOTFOUND )
enum nss_status _nss_call_getpwnam_r(const char *name, struct passwd *result,
char *buffer, size_t buflen, int *errnop)
{
struct passwd *res;
int ret = getpwnam_r(name, result, buffer, buflen, &res);
NSSRET(ret);
}
enum nss_status _nss_call_getpwuid_r(uid_t uid, struct passwd *result,
char *buffer, size_t buflen, int *errnop)
{
struct passwd *res;
int ret = getpwuid_r(uid, result, buffer, buflen, &res);
NSSRET(ret);
}
enum nss_status _nss_call_setpwent(void)
{
setpwent();
return NSS_STATUS_SUCCESS;
}
enum nss_status _nss_call_getpwent_r(struct passwd *result,
char *buffer, size_t buflen,
int *errnop)
{
struct passwd *res;
int ret = getpwent_r(result, buffer, buflen, &res);
NSSRET(ret);
}
enum nss_status _nss_call_endpwent(void)
{
endpwent();
return NSS_STATUS_SUCCESS;
}
enum nss_status _nss_call_getgrnam_r(const char *name, struct group *result,
char *buffer, size_t buflen, int *errnop)
{
struct group *res;
int ret = getgrnam_r(name, result, buffer, buflen, &res);
NSSRET(ret);
}
enum nss_status _nss_call_getgrgid_r(gid_t gid, struct group *result,
char *buffer, size_t buflen, int *errnop)
{
struct group *res;
int ret = getgrgid_r(gid, result, buffer, buflen, &res);
NSSRET(ret);
}
enum nss_status _nss_call_setgrent(void)
{
setgrent();
return NSS_STATUS_SUCCESS;
}
enum nss_status _nss_call_getgrent_r(struct group *result,
char *buffer, size_t buflen, int *errnop)
{
struct group *res;
int ret = getgrent_r(result, buffer, buflen, &res);
NSSRET(ret);
}
enum nss_status _nss_call_endgrent(void)
{
endgrent();
return NSS_STATUS_SUCCESS;
}
enum nss_status _nss_call_initgroups_dyn(const char *user, gid_t group,
long int *start, long int *size,
gid_t **groups, long int limit,
int *errnop)
{
int ngroups = 0;
gid_t *grps = NULL;
long int max_ret;
long int i;
int ret;
ret = getgrouplist(user, group, grps, &ngroups);
if (ret != -1) {
return NSS_STATUS_UNAVAIL;
}
grps = malloc(ngroups * sizeof(gid_t));
if (grps == NULL) {
return NSS_STATUS_UNAVAIL;
}
max_ret = ngroups;
/* check we have enough space in the buffer */
if ((*size - *start) < ngroups) {
long int newsize;
gid_t *newgroups;
newsize = *size + ngroups;
if ((limit > 0) && (newsize > limit)) {
newsize = limit;
max_ret = newsize - *start;
}
newgroups = (gid_t *)realloc((*groups), newsize * sizeof(**groups));
if (!newgroups) {
free(grps);
return NSS_STATUS_UNAVAIL;
}
*groups = newgroups;
*size = newsize;
}
for (i = 0; i < max_ret; i++) {
(*groups)[*start] = grps[i];
*start += 1;
}
free(grps);
return NSS_STATUS_SUCCESS;
}
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