glibc/hesiod/nss_hesiod/hesiod-grp.c
2012-02-09 23:18:22 +00:00

294 lines
6.6 KiB
C

/* Copyright (C) 1997, 1999, 2000, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997.
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 <hesiod.h>
#include <nss.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include "nss_hesiod.h"
/* Get the declaration of the parser function. */
#define ENTNAME grent
#define STRUCTURE group
#define EXTERN_PARSER
#include <nss/nss_files/files-parse.c>
enum nss_status
_nss_hesiod_setgrent (int stayopen)
{
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_hesiod_endgrent (void)
{
return NSS_STATUS_SUCCESS;
}
static enum nss_status
lookup (const char *name, const char *type, struct group *grp,
char *buffer, size_t buflen, int *errnop)
{
struct parser_data *data = (void *) buffer;
size_t linebuflen;
void *context;
char **list;
int parse_res;
size_t len;
int olderr = errno;
context = _nss_hesiod_init ();
if (context == NULL)
return NSS_STATUS_UNAVAIL;
list = hesiod_resolve (context, name, type);
if (list == NULL)
{
int err = errno;
hesiod_end (context);
__set_errno (olderr);
return err == ENOENT ? NSS_STATUS_NOTFOUND : NSS_STATUS_UNAVAIL;
}
linebuflen = buffer + buflen - data->linebuffer;
len = strlen (*list) + 1;
if (linebuflen < len)
{
hesiod_free_list (context, list);
hesiod_end (context);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
memcpy (data->linebuffer, *list, len);
hesiod_free_list (context, list);
hesiod_end (context);
parse_res = _nss_files_parse_grent (buffer, grp, data, buflen, errnop);
if (parse_res < 1)
{
__set_errno (olderr);
return parse_res == -1 ? NSS_STATUS_TRYAGAIN : NSS_STATUS_NOTFOUND;
}
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_hesiod_getgrnam_r (const char *name, struct group *grp,
char *buffer, size_t buflen, int *errnop)
{
return lookup (name, "group", grp, buffer, buflen, errnop);
}
enum nss_status
_nss_hesiod_getgrgid_r (gid_t gid, struct group *grp,
char *buffer, size_t buflen, int *errnop)
{
char gidstr[21]; /* We will probably never have a gid_t with more
than 64 bits. */
snprintf (gidstr, sizeof gidstr, "%d", gid);
return lookup (gidstr, "gid", grp, buffer, buflen, errnop);
}
static int
internal_gid_in_list (const gid_t *list, const gid_t g, long int len)
{
while (len > 0)
{
if (*list == g)
return 1;
--len;
++list;
}
return 0;
}
static enum nss_status
internal_gid_from_group (void *context, const char *groupname, gid_t *group)
{
char **grp_res;
enum nss_status status = NSS_STATUS_NOTFOUND;
grp_res = hesiod_resolve (context, groupname, "group");
if (grp_res != NULL && *grp_res != NULL)
{
char *p = *grp_res;
/* Skip to third field. */
while (*p != '\0' && *p != ':')
++p;
if (*p != '\0')
++p;
while (*p != '\0' && *p != ':')
++p;
if (*p != '\0')
{
char *endp;
char *q = ++p;
long int val;
while (*q != '\0' && *q != ':')
++q;
val = strtol (p, &endp, 10);
if (sizeof (gid_t) == sizeof (long int) || (gid_t) val == val)
{
*group = val;
if (endp == q && endp != p)
status = NSS_STATUS_SUCCESS;
}
}
hesiod_free_list (context, grp_res);
}
return status;
}
enum nss_status
_nss_hesiod_initgroups_dyn (const char *user, gid_t group, long int *start,
long int *size, gid_t **groupsp, long int limit,
int *errnop)
{
enum nss_status status = NSS_STATUS_SUCCESS;
char **list = NULL;
char *p;
void *context;
gid_t *groups = *groupsp;
int save_errno;
context = _nss_hesiod_init ();
if (context == NULL)
return NSS_STATUS_UNAVAIL;
list = hesiod_resolve (context, user, "grplist");
if (list == NULL)
{
hesiod_end (context);
return errno == ENOENT ? NSS_STATUS_NOTFOUND : NSS_STATUS_UNAVAIL;
}
if (!internal_gid_in_list (groups, group, *start))
{
if (__builtin_expect (*start == *size, 0))
{
/* Need a bigger buffer. */
gid_t *newgroups;
long int newsize;
if (limit > 0 && *size == limit)
/* We reached the maximum. */
goto done;
if (limit <= 0)
newsize = 2 * *size;
else
newsize = MIN (limit, 2 * *size);
newgroups = realloc (groups, newsize * sizeof (*groups));
if (newgroups == NULL)
goto done;
*groupsp = groups = newgroups;
*size = newsize;
}
groups[(*start)++] = group;
}
save_errno = errno;
p = *list;
while (*p != '\0')
{
char *endp;
char *q;
long int val;
status = NSS_STATUS_NOTFOUND;
q = p;
while (*q != '\0' && *q != ':' && *q != ',')
++q;
if (*q != '\0')
*q++ = '\0';
__set_errno (0);
val = strtol (p, &endp, 10);
/* Test whether the number is representable in a variable of
type `gid_t'. If not ignore the number. */
if ((sizeof (gid_t) == sizeof (long int) || (gid_t) val == val)
&& errno == 0)
{
if (*endp == '\0' && endp != p)
{
group = val;
status = NSS_STATUS_SUCCESS;
}
else
status = internal_gid_from_group (context, p, &group);
if (status == NSS_STATUS_SUCCESS
&& !internal_gid_in_list (groups, group, *start))
{
if (__builtin_expect (*start == *size, 0))
{
/* Need a bigger buffer. */
gid_t *newgroups;
long int newsize;
if (limit > 0 && *size == limit)
/* We reached the maximum. */
goto done;
if (limit <= 0)
newsize = 2 * *size;
else
newsize = MIN (limit, 2 * *size);
newgroups = realloc (groups, newsize * sizeof (*groups));
if (newgroups == NULL)
goto done;
*groupsp = groups = newgroups;
*size = newsize;
}
groups[(*start)++] = group;
}
}
p = q;
}
__set_errno (save_errno);
done:
hesiod_free_list (context, list);
hesiod_end (context);
return NSS_STATUS_SUCCESS;
}