308 lines
7.8 KiB
C
308 lines
7.8 KiB
C
/* Copyright (C) 1998-2002, 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 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 <netdb.h>
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#include <resolv.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 <arpa/nameser.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_hosts;
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static int nscd_gethst_r (const char *key, size_t keylen, request_type type,
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struct hostent *resultbuf, char *buffer,
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size_t buflen, int *h_errnop) internal_function;
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int
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__nscd_gethostbyname_r (const char *name, struct hostent *resultbuf,
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char *buffer, size_t buflen, int *h_errnop)
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{
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request_type reqtype;
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reqtype = (_res.options & RES_USE_INET6) ? GETHOSTBYNAMEv6 : GETHOSTBYNAME;
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return nscd_gethst_r (name, strlen (name) + 1, reqtype, resultbuf,
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buffer, buflen, h_errnop);
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}
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int
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__nscd_gethostbyname2_r (const char *name, int af, struct hostent *resultbuf,
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char *buffer, size_t buflen, int *h_errnop)
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{
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request_type reqtype;
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reqtype = af == AF_INET6 ? GETHOSTBYNAMEv6 : GETHOSTBYNAME;
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return nscd_gethst_r (name, strlen (name) + 1, reqtype, resultbuf,
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buffer, buflen, h_errnop);
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}
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int
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__nscd_gethostbyaddr_r (const void *addr, socklen_t len, int type,
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struct hostent *resultbuf, char *buffer, size_t buflen,
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int *h_errnop)
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{
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request_type reqtype;
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if (!((len == INADDRSZ && type == AF_INET)
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|| (len == IN6ADDRSZ && type == AF_INET6)))
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/* LEN and TYPE do not match. */
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return -1;
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reqtype = type == AF_INET6 ? GETHOSTBYADDRv6 : GETHOSTBYADDR;
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return nscd_gethst_r (addr, len, reqtype, resultbuf, buffer, buflen,
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h_errnop);
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}
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/* Create a socket connected to a name. */
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int
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__nscd_open_socket (void)
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{
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struct sockaddr_un addr;
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int sock;
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int saved_errno = errno;
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sock = __socket (PF_UNIX, SOCK_STREAM, 0);
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if (sock < 0)
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{
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__set_errno (saved_errno);
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return -1;
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}
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addr.sun_family = AF_UNIX;
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strcpy (addr.sun_path, _PATH_NSCDSOCKET);
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if (__connect (sock, (struct sockaddr *) &addr, sizeof (addr)) < 0)
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{
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__close (sock);
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__set_errno (saved_errno);
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return -1;
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}
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return sock;
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}
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static int
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internal_function
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nscd_gethst_r (const char *key, size_t keylen, request_type type,
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struct hostent *resultbuf, char *buffer, size_t buflen,
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int *h_errnop)
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{
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int sock = __nscd_open_socket ();
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hst_response_header hst_resp;
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request_header req;
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ssize_t nbytes;
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struct iovec vec[4];
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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 = req.key_len;
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nbytes = TEMP_FAILURE_RETRY (__writev (sock, vec, 2));
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if ((size_t) nbytes != sizeof (request_header) + req.key_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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nbytes = TEMP_FAILURE_RETRY (__read (sock, &hst_resp,
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sizeof (hst_response_header)));
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if (nbytes != sizeof (hst_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 (hst_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_hosts = 1;
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return -1;
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}
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if (hst_resp.found == 1)
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{
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uint32_t *aliases_len;
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char *cp = buffer;
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uintptr_t align1;
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uintptr_t align2;
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size_t total_len;
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ssize_t cnt;
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char *ignore;
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int n;
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/* A first check whether the buffer is sufficiently large is possible. */
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/* Now allocate the buffer the array for the group members. We must
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align the pointer and the base of the h_addr_list pointers. */
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align1 = ((__alignof__ (char *) - (cp - ((char *) 0)))
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& (__alignof__ (char *) - 1));
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align2 = ((__alignof__ (char *) - ((cp + align1 + hst_resp.h_name_len)
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- ((char *) 0)))
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& (__alignof__ (char *) - 1));
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if (buflen < (align1 + hst_resp.h_name_len + align2
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+ ((hst_resp.h_aliases_cnt + hst_resp.h_addr_list_cnt + 2)
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* sizeof (char *))
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+ hst_resp.h_addr_list_cnt * (type == AF_INET
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? INADDRSZ : IN6ADDRSZ)))
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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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cp += align1;
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/* Prepare the result as far as we can. */
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resultbuf->h_aliases = (char **) cp;
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cp += (hst_resp.h_aliases_cnt + 1) * sizeof (char *);
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resultbuf->h_addr_list = (char **) cp;
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cp += (hst_resp.h_addr_list_cnt + 1) * sizeof (char *);
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resultbuf->h_name = cp;
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cp += hst_resp.h_name_len + align2;
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vec[0].iov_base = resultbuf->h_name;
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vec[0].iov_len = hst_resp.h_name_len;
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aliases_len = alloca (hst_resp.h_aliases_cnt * sizeof (uint32_t));
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vec[1].iov_base = aliases_len;
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vec[1].iov_len = hst_resp.h_aliases_cnt * sizeof (uint32_t);
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total_len = (hst_resp.h_name_len
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+ hst_resp.h_aliases_cnt * sizeof (uint32_t));
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n = 2;
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if (type == GETHOSTBYADDR || type == GETHOSTBYNAME)
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{
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vec[2].iov_base = cp;
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vec[2].iov_len = hst_resp.h_addr_list_cnt * INADDRSZ;
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for (cnt = 0; cnt < hst_resp.h_addr_list_cnt; ++cnt)
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{
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resultbuf->h_addr_list[cnt] = cp;
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cp += INADDRSZ;
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}
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resultbuf->h_addrtype = AF_INET;
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resultbuf->h_length = INADDRSZ;
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total_len += hst_resp.h_addr_list_cnt * INADDRSZ;
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n = 3;
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}
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else
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{
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if (hst_resp.h_length == INADDRSZ)
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{
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ignore = alloca (hst_resp.h_addr_list_cnt * INADDRSZ);
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vec[2].iov_base = ignore;
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vec[2].iov_len = hst_resp.h_addr_list_cnt * INADDRSZ;
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total_len += hst_resp.h_addr_list_cnt * INADDRSZ;
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n = 3;
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}
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vec[n].iov_base = cp;
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vec[n].iov_len = hst_resp.h_addr_list_cnt * IN6ADDRSZ;
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for (cnt = 0; cnt < hst_resp.h_addr_list_cnt; ++cnt)
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{
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resultbuf->h_addr_list[cnt] = cp;
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cp += IN6ADDRSZ;
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}
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resultbuf->h_addrtype = AF_INET6;
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resultbuf->h_length = IN6ADDRSZ;
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total_len += hst_resp.h_addr_list_cnt * IN6ADDRSZ;
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++n;
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}
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resultbuf->h_addr_list[cnt] = NULL;
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if ((size_t) TEMP_FAILURE_RETRY (__readv (sock, vec, n)) != 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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/* Now we also can read the aliases. */
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total_len = 0;
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for (cnt = 0; cnt < hst_resp.h_aliases_cnt; ++cnt)
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{
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resultbuf->h_aliases[cnt] = cp;
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cp += aliases_len[cnt];
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total_len += aliases_len[cnt];
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}
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resultbuf->h_aliases[cnt] = NULL;
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/* See whether this would exceed the buffer capacity. */
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if (cp > buffer + buflen)
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goto no_room;
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/* And finally read the aliases. */
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if ((size_t) TEMP_FAILURE_RETRY (__read (sock, resultbuf->h_aliases[0],
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total_len)) != 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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__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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/* Store the error number. */
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*h_errnop = hst_resp.error;
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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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