Permalink
Cannot retrieve contributors at this time
Name already in use
A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
glibc/nscd/nscd_getgr_r.c
Go to fileThis commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
224 lines (185 sloc)
5.46 KB
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* Copyright (C) 1998, 1999, 2000, 2002 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) internal_function; | |
int | |
__nscd_getgrnam_r (const char *name, struct group *resultbuf, char *buffer, | |
size_t buflen) | |
{ | |
return nscd_getgr_r (name, strlen (name) + 1, GETGRBYNAME, resultbuf, | |
buffer, buflen); | |
} | |
int | |
__nscd_getgrgid_r (gid_t gid, struct group *resultbuf, char *buffer, | |
size_t buflen) | |
{ | |
char buf[12]; | |
size_t n; | |
n = __snprintf (buf, sizeof (buf), "%d", gid) + 1; | |
return nscd_getgr_r (buf, n, GETGRBYGID, resultbuf, buffer, buflen); | |
} | |
/* Create a socket connected to a name. */ | |
static int | |
open_socket (void) | |
{ | |
struct sockaddr_un addr; | |
int sock; | |
int saved_errno = errno; | |
sock = __socket (PF_UNIX, SOCK_STREAM, 0); | |
if (sock < 0) | |
{ | |
__set_errno (saved_errno); | |
return -1; | |
} | |
addr.sun_family = AF_UNIX; | |
strcpy (addr.sun_path, _PATH_NSCDSOCKET); | |
if (__connect (sock, (struct sockaddr *) &addr, sizeof (addr)) < 0) | |
{ | |
__close (sock); | |
__set_errno (saved_errno); | |
return -1; | |
} | |
return sock; | |
} | |
static int | |
internal_function | |
nscd_getgr_r (const char *key, size_t keylen, request_type type, | |
struct group *resultbuf, char *buffer, size_t buflen) | |
{ | |
int sock = open_socket (); | |
request_header req; | |
gr_response_header gr_resp; | |
ssize_t nbytes; | |
struct iovec vec[2]; | |
if (sock == -1) | |
{ | |
__nss_not_use_nscd_group = 1; | |
return -1; | |
} | |
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; | |
if ((size_t) __writev (sock, vec, 2) != sizeof (request_header) + keylen) | |
{ | |
__close (sock); | |
return -1; | |
} | |
nbytes = __read (sock, &gr_resp, sizeof (gr_response_header)); | |
if (nbytes != sizeof (gr_response_header)) | |
{ | |
__close (sock); | |
return -1; | |
} | |
if (gr_resp.found == -1) | |
{ | |
/* The daemon does not cache this database. */ | |
__close (sock); | |
__nss_not_use_nscd_group = 1; | |
return -1; | |
} | |
if (gr_resp.found == 1) | |
{ | |
uint32_t *len; | |
char *p = buffer; | |
size_t total_len; | |
uintptr_t align; | |
size_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 (buflen < total_len) | |
{ | |
no_room: | |
__set_errno (ERANGE); | |
__close (sock); | |
return ERANGE; | |
} | |
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. */ | |
if ((size_t) __readv (sock, vec, 2) != total_len) | |
{ | |
__close (sock); | |
return -1; | |
} | |
/* 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 (total_len > buflen) | |
goto no_room; | |
if (__read (sock, resultbuf->gr_mem[0], total_len) != total_len) | |
{ | |
__close (sock); | |
/* The `errno' to some value != ERANGE. */ | |
__set_errno (ENOENT); | |
return ENOENT; | |
} | |
__close (sock); | |
return 0; | |
} | |
else | |
{ | |
__close (sock); | |
/* The `errno' to some value != ERANGE. */ | |
__set_errno (ENOENT); | |
return ENOENT; | |
} | |
} |