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glibc/nscd/nscd_gethst_r.c
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/* Copyright (C) 1998, 1999 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Library General Public License as | |
published by the Free Software Foundation; either version 2 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 | |
Library General Public License for more details. | |
You should have received a copy of the GNU Library General Public | |
License along with the GNU C Library; see the file COPYING.LIB. If not, | |
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
Boston, MA 02111-1307, USA. */ | |
#include <errno.h> | |
#include <netdb.h> | |
#include <resolv.h> | |
#include <stdint.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <unistd.h> | |
#include <arpa/nameser.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_hosts; | |
static int nscd_gethst_r (const char *key, size_t keylen, request_type type, | |
struct hostent *resultbuf, char *buffer, | |
size_t buflen, int *h_errnop) internal_function; | |
int | |
__nscd_gethostbyname_r (const char *name, struct hostent *resultbuf, | |
char *buffer, size_t buflen, int *h_errnop) | |
{ | |
request_type reqtype; | |
reqtype = (_res.options & RES_USE_INET6) ? GETHOSTBYNAMEv6 : GETHOSTBYNAME; | |
return nscd_gethst_r (name, strlen (name) + 1, reqtype, resultbuf, | |
buffer, buflen, h_errnop); | |
} | |
int | |
__nscd_gethostbyname2_r (const char *name, int af, struct hostent *resultbuf, | |
char *buffer, size_t buflen, int *h_errnop) | |
{ | |
request_type reqtype; | |
reqtype = af == AF_INET6 ? GETHOSTBYNAMEv6 : GETHOSTBYNAME; | |
return nscd_gethst_r (name, strlen (name) + 1, reqtype, resultbuf, | |
buffer, buflen, h_errnop); | |
} | |
int | |
__nscd_gethostbyaddr_r (const char *addr, int len, int type, | |
struct hostent *resultbuf, char *buffer, size_t buflen, | |
int *h_errnop) | |
{ | |
request_type reqtype; | |
if (!((len == INADDRSZ && type == AF_INET) | |
|| (len == IN6ADDRSZ && type == AF_INET6))) | |
/* LEN and TYPE do not match. */ | |
return -1; | |
reqtype = type == AF_INET6 ? GETHOSTBYADDRv6 : GETHOSTBYADDR; | |
return nscd_gethst_r (addr, len, reqtype, resultbuf, buffer, buflen, | |
h_errnop); | |
} | |
/* 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_gethst_r (const char *key, size_t keylen, request_type type, | |
struct hostent *resultbuf, char *buffer, size_t buflen, | |
int *h_errnop) | |
{ | |
int sock = open_socket (); | |
hst_response_header hst_resp; | |
request_header req; | |
ssize_t nbytes; | |
if (sock == -1) | |
{ | |
__nss_not_use_nscd_group = 1; | |
return -1; | |
} | |
req.version = NSCD_VERSION; | |
req.type = type; | |
req.key_len = keylen; | |
nbytes = __write (sock, &req, sizeof (request_header)); | |
if (nbytes != sizeof (request_header)) | |
{ | |
__close (sock); | |
return -1; | |
} | |
nbytes = __write (sock, key, req.key_len); | |
if (nbytes != req.key_len) | |
{ | |
__close (sock); | |
return -1; | |
} | |
nbytes = __read (sock, &hst_resp, sizeof (hst_response_header)); | |
if (nbytes != sizeof (hst_response_header)) | |
{ | |
__close (sock); | |
return -1; | |
} | |
if (hst_resp.found == -1) | |
{ | |
/* The daemon does not cache this database. */ | |
__close (sock); | |
__nss_not_use_nscd_hosts = 1; | |
return -1; | |
} | |
if (hst_resp.found == 1) | |
{ | |
struct iovec vec[4]; | |
size_t *aliases_len; | |
char *cp = buffer; | |
uintptr_t align1; | |
uintptr_t align2; | |
size_t total_len; | |
ssize_t cnt; | |
char *ignore; | |
int n; | |
/* A first check whether the buffer is sufficently large is possible. */ | |
/* Now allocate the buffer the array for the group members. We must | |
align the pointer and the base of the h_addr_list pointers. */ | |
align1 = ((__alignof__ (char *) - (cp - ((char *) 0))) | |
& (__alignof__ (char *) - 1)); | |
align2 = ((__alignof__ (char *) - ((cp + align1 + hst_resp.h_name_len) | |
- ((char *) 0))) | |
& (__alignof__ (char *) - 1)); | |
if (buflen < (align1 + hst_resp.h_name_len + align2 + | |
+ ((hst_resp.h_aliases_cnt + hst_resp.h_addr_list_cnt + 2) | |
* sizeof (char *)) | |
+ hst_resp.h_addr_list_cnt * (type == AF_INET | |
? INADDRSZ : IN6ADDRSZ))) | |
{ | |
no_room: | |
__set_errno (ERANGE); | |
__close (sock); | |
return ERANGE; | |
} | |
cp += align1; | |
/* Prepare the result as far as we can. */ | |
resultbuf->h_aliases = (char **) cp; | |
cp += (hst_resp.h_aliases_cnt + 1) * sizeof (char *); | |
resultbuf->h_addr_list = (char **) cp; | |
cp += (hst_resp.h_addr_list_cnt + 1) * sizeof (char *); | |
resultbuf->h_name = cp; | |
cp += hst_resp.h_name_len + align2; | |
vec[0].iov_base = resultbuf->h_name; | |
vec[0].iov_len = hst_resp.h_name_len; | |
aliases_len = alloca (hst_resp.h_aliases_cnt * sizeof (size_t)); | |
vec[1].iov_base = aliases_len; | |
vec[1].iov_len = hst_resp.h_aliases_cnt * sizeof (size_t); | |
total_len = (hst_resp.h_name_len | |
+ hst_resp.h_aliases_cnt * sizeof (size_t)); | |
n = 2; | |
/* These things must be aligned or ntohl will cause havoc. */ | |
align = ((__alignof__ (char *) - (cp - ((char *) 0))) | |
& (__alignof__ (char *) - 1)); | |
cp += align; | |
if (type == GETHOSTBYADDR || type == GETHOSTBYNAME) | |
{ | |
vec[2].iov_base = cp; | |
vec[2].iov_len = hst_resp.h_addr_list_cnt * INADDRSZ; | |
ignore = alloca (hst_resp.h_addr_list_cnt * IN6ADDRSZ); | |
vec[3].iov_base = ignore; | |
vec[3].iov_len = hst_resp.h_addr_list_cnt * IN6ADDRSZ; | |
for (cnt = 0; cnt < hst_resp.h_addr_list_cnt; ++cnt) | |
{ | |
resultbuf->h_addr_list[cnt] = cp; | |
cp += INADDRSZ; | |
} | |
resultbuf->h_addrtype = AF_INET; | |
resultbuf->h_length = INADDRSZ; | |
total_len += hst_resp.h_addr_list_cnt * (INADDRSZ + IN6ADDRSZ); | |
n = 4; | |
} | |
else | |
{ | |
if (hst_resp.h_length == INADDRSZ) | |
{ | |
ignore = alloca (hst_resp.h_addr_list_cnt * INADDRSZ); | |
vec[2].iov_base = ignore; | |
vec[2].iov_len = hst_resp.h_addr_list_cnt * INADDRSZ; | |
total_len += hst_resp.h_addr_list_cnt * INADDRSZ; | |
n = 3; | |
} | |
vec[n].iov_base = cp; | |
vec[n].iov_len = hst_resp.h_addr_list_cnt * IN6ADDRSZ; | |
for (cnt = 0; cnt < hst_resp.h_addr_list_cnt; ++cnt) | |
{ | |
resultbuf->h_addr_list[cnt] = cp; | |
cp += IN6ADDRSZ; | |
} | |
resultbuf->h_addrtype = AF_INET6; | |
resultbuf->h_length = IN6ADDRSZ; | |
total_len += hst_resp.h_addr_list_cnt * IN6ADDRSZ; | |
++n; | |
} | |
resultbuf->h_addr_list[cnt] = NULL; | |
if (__readv (sock, vec, n) != total_len) | |
{ | |
__close (sock); | |
return -1; | |
} | |
/* Now we also can read the aliases. */ | |
total_len = 0; | |
for (cnt = 0; cnt < hst_resp.h_aliases_cnt; ++cnt) | |
{ | |
resultbuf->h_aliases[cnt] = cp; | |
cp += aliases_len[cnt]; | |
total_len += aliases_len[cnt]; | |
} | |
resultbuf->h_aliases[cnt] = NULL; | |
/* See whether this would exceed the buffer capacity. */ | |
if (cp > buffer + buflen) | |
goto no_room; | |
/* And finally read the aliases. */ | |
if (__read (sock, resultbuf->h_aliases[0], total_len) != total_len) | |
{ | |
__close (sock); | |
return -1; | |
} | |
__close (sock); | |
return 0; | |
} | |
else | |
{ | |
/* Store the error number. */ | |
*h_errnop = hst_resp.error; | |
__close (sock); | |
/* The `errno' to some value != ERANGE. */ | |
__set_errno (ENOENT); | |
return ENOENT; | |
} | |
} |