200 lines
5.1 KiB
C
200 lines
5.1 KiB
C
/* Copyright (C) 1998, 1999, 2000, 2002, 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Thorsten Kukuk <kukuk@uni-paderborn.de>, 1998.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <grp.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <sys/uio.h>
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#include <sys/un.h>
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#include "nscd-client.h"
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#include "nscd_proto.h"
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int __nss_not_use_nscd_group;
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static int nscd_getgr_r (const char *key, size_t keylen, request_type type,
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struct group *resultbuf, char *buffer,
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size_t buflen) internal_function;
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int
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__nscd_getgrnam_r (const char *name, struct group *resultbuf, char *buffer,
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size_t buflen)
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{
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return nscd_getgr_r (name, strlen (name) + 1, GETGRBYNAME, resultbuf,
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buffer, buflen);
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}
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int
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__nscd_getgrgid_r (gid_t gid, struct group *resultbuf, char *buffer,
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size_t buflen)
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{
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char buf[12];
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size_t n;
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n = __snprintf (buf, sizeof (buf), "%d", gid) + 1;
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return nscd_getgr_r (buf, n, GETGRBYGID, resultbuf, buffer, buflen);
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}
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static int
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internal_function
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nscd_getgr_r (const char *key, size_t keylen, request_type type,
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struct group *resultbuf, char *buffer, size_t buflen)
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{
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int sock = __nscd_open_socket ();
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request_header req;
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gr_response_header gr_resp;
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ssize_t nbytes;
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struct iovec vec[2];
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if (sock == -1)
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{
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__nss_not_use_nscd_group = 1;
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return -1;
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}
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req.version = NSCD_VERSION;
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req.type = type;
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req.key_len = keylen;
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vec[0].iov_base = &req;
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vec[0].iov_len = sizeof (request_header);
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vec[1].iov_base = (void *) key;
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vec[1].iov_len = keylen;
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nbytes = TEMP_FAILURE_RETRY (__writev (sock, vec, 2));
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if (nbytes != (ssize_t) (sizeof (request_header) + keylen))
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{
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__close (sock);
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return -1;
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}
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nbytes = TEMP_FAILURE_RETRY (__read (sock, &gr_resp,
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sizeof (gr_response_header)));
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if (nbytes != (ssize_t) sizeof (gr_response_header))
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{
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__close (sock);
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return -1;
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}
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if (gr_resp.found == -1)
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{
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/* The daemon does not cache this database. */
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__close (sock);
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__nss_not_use_nscd_group = 1;
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return -1;
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}
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if (gr_resp.found == 1)
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{
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uint32_t *len;
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char *p = buffer;
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size_t total_len;
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uintptr_t align;
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nscd_ssize_t cnt;
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/* Now allocate the buffer the array for the group members. We must
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align the pointer. */
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align = ((__alignof__ (char *) - (p - ((char *) 0)))
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& (__alignof__ (char *) - 1));
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total_len = align + (1 + gr_resp.gr_mem_cnt) * sizeof (char *)
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+ gr_resp.gr_name_len + gr_resp.gr_passwd_len;
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if (buflen < total_len)
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{
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no_room:
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__set_errno (ERANGE);
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__close (sock);
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return ERANGE;
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}
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buflen -= total_len;
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p += align;
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resultbuf->gr_mem = (char **) p;
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p += (1 + gr_resp.gr_mem_cnt) * sizeof (char *);
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/* Set pointers for strings. */
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resultbuf->gr_name = p;
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p += gr_resp.gr_name_len;
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resultbuf->gr_passwd = p;
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p += gr_resp.gr_passwd_len;
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/* Fill in what we know now. */
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resultbuf->gr_gid = gr_resp.gr_gid;
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/* Allocate array to store lengths. */
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len = (uint32_t *) alloca (gr_resp.gr_mem_cnt * sizeof (uint32_t));
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total_len = gr_resp.gr_mem_cnt * sizeof (uint32_t);
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vec[0].iov_base = len;
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vec[0].iov_len = total_len;
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vec[1].iov_base = resultbuf->gr_name;
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vec[1].iov_len = gr_resp.gr_name_len + gr_resp.gr_passwd_len;
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total_len += gr_resp.gr_name_len + gr_resp.gr_passwd_len;
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/* Get this data. */
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if ((size_t) TEMP_FAILURE_RETRY (__readv (sock, vec, 2)) != total_len)
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{
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__close (sock);
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return -1;
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}
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/* Clear the terminating entry. */
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resultbuf->gr_mem[gr_resp.gr_mem_cnt] = NULL;
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/* Prepare reading the group members. */
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total_len = 0;
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for (cnt = 0; cnt < gr_resp.gr_mem_cnt; ++cnt)
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{
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resultbuf->gr_mem[cnt] = p;
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total_len += len[cnt];
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p += len[cnt];
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}
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if (total_len > buflen)
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goto no_room;
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if ((size_t) TEMP_FAILURE_RETRY (__read (sock, resultbuf->gr_mem[0],
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total_len)) != total_len)
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{
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__close (sock);
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/* The `errno' to some value != ERANGE. */
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__set_errno (ENOENT);
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return ENOENT;
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}
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__close (sock);
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return 0;
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}
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else
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{
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__close (sock);
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/* The `errno' to some value != ERANGE. */
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__set_errno (ENOENT);
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return ENOENT;
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}
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}
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