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/* Copyright (C) 1998, 1999, 2000, 2002, 2003, 2004
Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@uni-paderborn.de>, 1998.
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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <errno.h>
#include <grp.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <sys/un.h>
#include "nscd-client.h"
#include "nscd_proto.h"
int __nss_not_use_nscd_group;
static int nscd_getgr_r (const char *key, size_t keylen, request_type type,
struct group *resultbuf, char *buffer,
size_t buflen, struct group **result)
internal_function;
int
__nscd_getgrnam_r (const char *name, struct group *resultbuf, char *buffer,
size_t buflen, struct group **result)
{
return nscd_getgr_r (name, strlen (name) + 1, GETGRBYNAME, resultbuf,
buffer, buflen, result);
}
int
__nscd_getgrgid_r (gid_t gid, struct group *resultbuf, char *buffer,
size_t buflen, struct group **result)
{
char buf[12];
size_t n;
n = __snprintf (buf, sizeof (buf), "%d", gid) + 1;
return nscd_getgr_r (buf, n, GETGRBYGID, resultbuf, buffer, buflen, result);
}
static int
internal_function
nscd_getgr_r (const char *key, size_t keylen, request_type type,
struct group *resultbuf, char *buffer, size_t buflen,
struct group **result)
{
int sock = __nscd_open_socket ();
request_header req;
gr_response_header gr_resp;
ssize_t nbytes;
struct iovec vec[2];
int retval = -1;
if (sock == -1)
{
__nss_not_use_nscd_group = 1;
return -1;
}
/* No value found so far. */
*result = NULL;
req.version = NSCD_VERSION;
req.type = type;
req.key_len = keylen;
vec[0].iov_base = &req;
vec[0].iov_len = sizeof (request_header);
vec[1].iov_base = (void *) key;
vec[1].iov_len = keylen;
nbytes = TEMP_FAILURE_RETRY (__writev (sock, vec, 2));
if (nbytes != (ssize_t) (sizeof (request_header) + keylen))
goto out;
nbytes = TEMP_FAILURE_RETRY (__read (sock, &gr_resp,
sizeof (gr_response_header)));
if (nbytes != (ssize_t) sizeof (gr_response_header))
goto out;
if (gr_resp.found == -1)
{
/* The daemon does not cache this database. */
__nss_not_use_nscd_group = 1;
goto out;
}
if (gr_resp.found == 1)
{
uint32_t *len;
char *p = buffer;
size_t total_len;
uintptr_t align;
nscd_ssize_t cnt;
/* Now allocate the buffer the array for the group members. We must
align the pointer. */
align = ((__alignof__ (char *) - (p - ((char *) 0)))
& (__alignof__ (char *) - 1));
total_len = align + (1 + gr_resp.gr_mem_cnt) * sizeof (char *)
+ gr_resp.gr_name_len + gr_resp.gr_passwd_len;
if (__builtin_expect (buflen < total_len, 0))
{
no_room:
__set_errno (ERANGE);
retval = ERANGE;
goto out;
}
buflen -= total_len;
p += align;
resultbuf->gr_mem = (char **) p;
p += (1 + gr_resp.gr_mem_cnt) * sizeof (char *);
/* Set pointers for strings. */
resultbuf->gr_name = p;
p += gr_resp.gr_name_len;
resultbuf->gr_passwd = p;
p += gr_resp.gr_passwd_len;
/* Fill in what we know now. */
resultbuf->gr_gid = gr_resp.gr_gid;
/* Allocate array to store lengths. */
len = (uint32_t *) alloca (gr_resp.gr_mem_cnt * sizeof (uint32_t));
total_len = gr_resp.gr_mem_cnt * sizeof (uint32_t);
vec[0].iov_base = len;
vec[0].iov_len = total_len;
vec[1].iov_base = resultbuf->gr_name;
vec[1].iov_len = gr_resp.gr_name_len + gr_resp.gr_passwd_len;
total_len += gr_resp.gr_name_len + gr_resp.gr_passwd_len;
/* Get this data. */
size_t n = TEMP_FAILURE_RETRY (__readv (sock, vec, 2));
if (__builtin_expect (n != total_len, 0))
goto out;
/* Clear the terminating entry. */
resultbuf->gr_mem[gr_resp.gr_mem_cnt] = NULL;
/* Prepare reading the group members. */
total_len = 0;
for (cnt = 0; cnt < gr_resp.gr_mem_cnt; ++cnt)
{
resultbuf->gr_mem[cnt] = p;
total_len += len[cnt];
p += len[cnt];
}
if (__builtin_expect (total_len > buflen, 0))
goto no_room;
retval = 0;
n = TEMP_FAILURE_RETRY (__read (sock, resultbuf->gr_mem[0],
total_len));
if (__builtin_expect (n != total_len, 0))
{
/* The `errno' to some value != ERANGE. */
__set_errno (ENOENT);
retval = ENOENT;
}
else
*result = resultbuf;
}
else
{
/* The `errno' to some value != ERANGE. */
__set_errno (ENOENT);
/* Even though we have not found anything, the result is zero. */
retval = 0;
}
out:
__close (sock);
return retval;
}
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