glibc/nis/nss_nis/nis-grp.c

360 lines
7.8 KiB
C

/* Copyright (C) 1996-2013 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@suse.de>, 1996.
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 <ctype.h>
#include <errno.h>
#include <grp.h>
#include <nss.h>
#include <string.h>
#include <bits/libc-lock.h>
#include <rpcsvc/yp.h>
#include <rpcsvc/ypclnt.h>
#include "nss-nis.h"
#include <libnsl.h>
/* Get the declaration of the parser function. */
#define ENTNAME grent
#define STRUCTURE group
#define EXTERN_PARSER
#include <nss/nss_files/files-parse.c>
/* Protect global state against multiple changers */
__libc_lock_define_initialized (static, lock)
static bool_t new_start = 1;
static char *oldkey;
static int oldkeylen;
static intern_t intern;
static void
internal_nis_endgrent (void)
{
new_start = 1;
if (oldkey != NULL)
{
free (oldkey);
oldkey = NULL;
oldkeylen = 0;
}
struct response_t *curr = intern.start;
while (curr != NULL)
{
struct response_t *last = curr;
curr = curr->next;
free (last);
}
intern.next = intern.start = NULL;
}
enum nss_status
_nss_nis_endgrent (void)
{
__libc_lock_lock (lock);
internal_nis_endgrent ();
__libc_lock_unlock (lock);
return NSS_STATUS_SUCCESS;
}
enum nss_status
internal_nis_setgrent (void)
{
/* We have to read all the data now. */
char *domain;
if (__builtin_expect (yp_get_default_domain (&domain), 0))
return NSS_STATUS_UNAVAIL;
struct ypall_callback ypcb;
ypcb.foreach = _nis_saveit;
ypcb.data = (char *) &intern;
enum nss_status status = yperr2nss (yp_all (domain, "group.byname", &ypcb));
/* Mark the last buffer as full. */
if (intern.next != NULL)
intern.next->size = intern.offset;
intern.next = intern.start;
intern.offset = 0;
return status;
}
enum nss_status
_nss_nis_setgrent (int stayopen)
{
enum nss_status result = NSS_STATUS_SUCCESS;
__libc_lock_lock (lock);
internal_nis_endgrent ();
if (_nsl_default_nss () & NSS_FLAG_SETENT_BATCH_READ)
result = internal_nis_setgrent ();
__libc_lock_unlock (lock);
return result;
}
static enum nss_status
internal_nis_getgrent_r (struct group *grp, char *buffer, size_t buflen,
int *errnop)
{
/* If we read the entire database at setpwent time we just iterate
over the data we have in memory. */
bool batch_read = intern.start != NULL;
char *domain = NULL;
if (!batch_read && __builtin_expect (yp_get_default_domain (&domain), 0))
return NSS_STATUS_UNAVAIL;
/* Get the next entry until we found a correct one. */
int parse_res;
do
{
char *result;
char *outkey;
int len;
int keylen;
if (batch_read)
{
struct response_t *bucket;
handle_batch_read:
bucket = intern.next;
if (__builtin_expect (intern.offset >= bucket->size, 0))
{
if (bucket->next == NULL)
return NSS_STATUS_NOTFOUND;
/* We look at all the content in the current bucket. Go on
to the next. */
bucket = intern.next = bucket->next;
intern.offset = 0;
}
for (result = &bucket->mem[intern.offset]; isspace (*result);
++result)
++intern.offset;
len = strlen (result);
}
else
{
int yperr;
if (new_start)
{
/* Maybe we should read the database in one piece. */
if ((_nsl_default_nss () & NSS_FLAG_SETENT_BATCH_READ)
&& internal_nis_setgrent () == NSS_STATUS_SUCCESS
&& intern.start != NULL)
{
batch_read = true;
goto handle_batch_read;
}
yperr = yp_first (domain, "group.byname", &outkey, &keylen,
&result, &len);
}
else
yperr = yp_next (domain, "group.byname", oldkey, oldkeylen,
&outkey, &keylen, &result, &len);
if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
{
enum nss_status retval = yperr2nss (yperr);
if (retval == NSS_STATUS_TRYAGAIN)
*errnop = errno;
return retval;
}
}
if (__builtin_expect ((size_t) (len + 1) > buflen, 0))
{
if (!batch_read)
free (result);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
char *p = strncpy (buffer, result, len);
buffer[len] = '\0';
while (isspace (*p))
++p;
if (!batch_read)
free (result);
parse_res = _nss_files_parse_grent (p, grp, (void *) buffer, buflen,
errnop);
if (__builtin_expect (parse_res == -1, 0))
{
if (!batch_read)
free (outkey);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
if (batch_read)
intern.offset += len + 1;
else
{
free (oldkey);
oldkey = outkey;
oldkeylen = keylen;
new_start = 0;
}
}
while (parse_res < 1);
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_nis_getgrent_r (struct group *result, char *buffer, size_t buflen,
int *errnop)
{
int status;
__libc_lock_lock (lock);
status = internal_nis_getgrent_r (result, buffer, buflen, errnop);
__libc_lock_unlock (lock);
return status;
}
enum nss_status
_nss_nis_getgrnam_r (const char *name, struct group *grp,
char *buffer, size_t buflen, int *errnop)
{
if (name == NULL)
{
*errnop = EINVAL;
return NSS_STATUS_UNAVAIL;
}
char *domain;
if (__builtin_expect (yp_get_default_domain (&domain), 0))
return NSS_STATUS_UNAVAIL;
char *result;
int len;
int yperr = yp_match (domain, "group.byname", name, strlen (name), &result,
&len);
if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
{
enum nss_status retval = yperr2nss (yperr);
if (retval == NSS_STATUS_TRYAGAIN)
*errnop = errno;
return retval;
}
if (__builtin_expect ((size_t) (len + 1) > buflen, 0))
{
free (result);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
char *p = strncpy (buffer, result, len);
buffer[len] = '\0';
while (isspace (*p))
++p;
free (result);
int parse_res = _nss_files_parse_grent (p, grp, (void *) buffer, buflen,
errnop);
if (__builtin_expect (parse_res < 1, 0))
{
if (parse_res == -1)
return NSS_STATUS_TRYAGAIN;
else
return NSS_STATUS_NOTFOUND;
}
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_nis_getgrgid_r (gid_t gid, struct group *grp,
char *buffer, size_t buflen, int *errnop)
{
char *domain;
if (__builtin_expect (yp_get_default_domain (&domain), 0))
return NSS_STATUS_UNAVAIL;
char buf[32];
int nlen = sprintf (buf, "%lu", (unsigned long int) gid);
char *result;
int len;
int yperr = yp_match (domain, "group.bygid", buf, nlen, &result, &len);
if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
{
enum nss_status retval = yperr2nss (yperr);
if (retval == NSS_STATUS_TRYAGAIN)
*errnop = errno;
return retval;
}
if (__builtin_expect ((size_t) (len + 1) > buflen, 0))
{
free (result);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
char *p = strncpy (buffer, result, len);
buffer[len] = '\0';
while (isspace (*p))
++p;
free (result);
int parse_res = _nss_files_parse_grent (p, grp, (void *) buffer, buflen,
errnop);
if (__builtin_expect (parse_res < 1, 0))
{
if (parse_res == -1)
return NSS_STATUS_TRYAGAIN;
else
return NSS_STATUS_NOTFOUND;
}
return NSS_STATUS_SUCCESS;
}