413 lines
11 KiB
C
413 lines
11 KiB
C
/* Copyright (C) 1997 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@vt.uni-paderborn.de>, 1997.
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <nss.h>
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#include <netdb.h>
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#include <errno.h>
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#include <ctype.h>
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#include <string.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <libc-lock.h>
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#include <rpcsvc/nis.h>
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#include <rpcsvc/nislib.h>
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#include "nss-nisplus.h"
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__libc_lock_define_initialized (static, lock)
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static nis_result *result = NULL;
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static nis_name *names = NULL;
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#define NISENTRYVAL(idx,col,res) \
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((res)->objects.objects_val[(idx)].zo_data.objdata_u.en_data.en_cols.en_cols_val[(col)].ec_value.ec_value_val)
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#define NISENTRYLEN(idx,col,res) \
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((res)->objects.objects_val[(idx)].zo_data.objdata_u.en_data.en_cols.en_cols_val[(col)].ec_value.ec_value_len)
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/* Get implementation for some internal functions. */
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#include "../../resolv/mapv4v6addr.h"
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#include "../../resolv/mapv4v6hostent.h"
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#define ENTNAME hostent
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#define DATABASE "hosts"
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#define NEED_H_ERRNO
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#define ENTDATA hostent_data
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struct hostent_data
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{
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unsigned char host_addr[16]; /* IPv4 or IPv6 address. */
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char *h_addr_ptrs[2]; /* Points to that and null terminator. */
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};
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#define TRAILING_LIST_MEMBER h_aliases
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#define TRAILING_LIST_SEPARATOR_P isspace
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#include "../../nss/nss_files/files-parse.c"
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LINE_PARSER
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("#",
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{
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char *addr;
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STRING_FIELD (addr, isspace, 1);
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/* Parse address. */
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if ((_res.options & RES_USE_INET6)
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&& inet_pton (AF_INET6, addr, entdata->host_addr) > 0)
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{
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result->h_addrtype = AF_INET6;
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result->h_length = IN6ADDRSZ;
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}
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else
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if (inet_pton (AF_INET, addr, entdata->host_addr) > 0)
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{
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if (_res.options & RES_USE_INET6)
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{
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map_v4v6_address ((char *) entdata->host_addr,
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(char *) entdata->host_addr);
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result->h_addrtype = AF_INET6;
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result->h_length = IN6ADDRSZ;
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}
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else
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{
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result->h_addrtype = AF_INET;
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result->h_length = INADDRSZ;
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}
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}
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else
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/* Illegal address: ignore line. */
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return 0;
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/* Store a pointer to the address in the expected form. */
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entdata->h_addr_ptrs[0] = entdata->host_addr;
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entdata->h_addr_ptrs[1] = NULL;
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result->h_addr_list = entdata->h_addr_ptrs;
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/* If we need the host entry in IPv6 form change it now. */
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if (_res.options & RES_USE_INET6)
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{
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char *bufptr = data->linebuffer;
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size_t buflen = (char *) data + datalen - bufptr;
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map_v4v6_hostent (result, &bufptr, &buflen);
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}
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STRING_FIELD (result->h_name, isspace, 1);
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}
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)
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static int
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_nss_nisplus_parse_hostent (nis_result *result, struct hostent *host,
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char *buffer, size_t buflen)
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{
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char *p = buffer;
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size_t room_left = buflen;
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int parse_res, i;
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struct parser_data *data = (void *) buffer;
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if (result == NULL)
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return -1;
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if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS) ||
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result->objects.objects_val[0].zo_data.zo_type != ENTRY_OBJ ||
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strcmp(result->objects.objects_val[0].zo_data.objdata_u.en_data.en_type,
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"hosts_tbl") != 0 ||
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result->objects.objects_val[0].zo_data.objdata_u.en_data.en_cols.en_cols_len < 4)
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return -1;
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memset (p, '\0', room_left);
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/* Generate the hosts entry format and use the normal parser */
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if (NISENTRYLEN (0, 2, result) + 1 > room_left)
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{
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__set_errno (ERANGE);
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return -1;
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}
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strncpy (p, NISENTRYVAL (0, 2, result),
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NISENTRYLEN (0, 2, result));
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room_left -= (NISENTRYLEN (0, 2, result) + 1);
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if (NISENTRYLEN (0, 0, result) + 1 > room_left)
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{
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__set_errno (ERANGE);
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return -1;
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}
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strcat (p, "\t");
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strncat (p, NISENTRYVAL (0, 0, result), NISENTRYLEN (0, 0, result));
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room_left -= (NISENTRYLEN (0, 0, result) + 1);
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/* + 1: We overwrite the last \0 */
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for (i = 1; i < result->objects.objects_len; i++)
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{
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if (NISENTRYLEN (i, 1, result) + 1 > room_left)
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{
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__set_errno (ERANGE);
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return -1;
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}
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strcat (p, " ");
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strcat (p, NISENTRYVAL (i, 1, result));
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room_left -= (NISENTRYLEN (i, 1, result) + 1);
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}
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parse_res = parse_line (p, host, data, buflen);
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return parse_res;
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}
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enum nss_status
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_nss_nisplus_sethostent (void)
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{
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__libc_lock_lock (lock);
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if (result)
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nis_freeresult (result);
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result = NULL;
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if (names)
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{
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nis_freenames (names);
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names = NULL;
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}
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__libc_lock_unlock (lock);
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return NSS_STATUS_SUCCESS;
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}
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enum nss_status
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_nss_nisplus_endhostent (void)
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{
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__libc_lock_lock (lock);
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if (result)
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nis_freeresult (result);
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result = NULL;
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if (names)
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{
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nis_freenames (names);
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names = NULL;
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}
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__libc_lock_unlock (lock);
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return NSS_STATUS_SUCCESS;
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}
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static enum nss_status
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internal_nisplus_gethostent_r (struct hostent *host, char *buffer,
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size_t buflen, int *herrnop)
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{
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int parse_res;
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/* Get the next entry until we found a correct one. */
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do
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{
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if (result == NULL)
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{
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names = nis_getnames("hosts.org_dir");
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if (names == NULL || names[0] == NULL)
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return NSS_STATUS_UNAVAIL;
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result = nis_first_entry(names[0]);
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if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
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{
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int retval;
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retval = niserr2nss (result->status);
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if (retval == NSS_STATUS_TRYAGAIN)
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{
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*herrnop = NETDB_INTERNAL;
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__set_errno (EAGAIN);
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}
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return retval;
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}
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}
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else
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{
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nis_result *res2;
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res2 = nis_next_entry(names[0], &result->cookie);
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nis_freeresult (result);
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result = res2;
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if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
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{
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int retval;
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retval = niserr2nss (result->status);
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if (retval == NSS_STATUS_TRYAGAIN)
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{
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*herrnop = NETDB_INTERNAL;
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__set_errno (EAGAIN);
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}
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return retval;
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}
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}
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parse_res = _nss_nisplus_parse_hostent (result, host, buffer, buflen);
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if (!parse_res && errno == ERANGE)
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{
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*herrnop = NETDB_INTERNAL;
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return NSS_STATUS_TRYAGAIN;
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}
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} while (!parse_res);
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return NSS_STATUS_SUCCESS;
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}
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enum nss_status
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_nss_nisplus_gethostent_r (struct hostent *result, char *buffer,
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size_t buflen, int *herrnop)
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{
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int status;
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__libc_lock_lock (lock);
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status = internal_nisplus_gethostent_r (result, buffer, buflen, herrnop);
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__libc_lock_unlock (lock);
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return status;
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}
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enum nss_status
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_nss_nisplus_gethostbyname2_r (const char *name, int af, struct hostent *host,
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char *buffer, size_t buflen, int *herrnop)
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{
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int parse_res, retval;
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if (name == NULL)
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{
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__set_errno (EINVAL);
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*herrnop = NETDB_INTERNAL;
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return NSS_STATUS_NOTFOUND;
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}
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else
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{
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nis_result *result;
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char buf[strlen (name) + 255];
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/* Search at first in the alias list, and use the correct name
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for the next search */
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sprintf(buf, "[name=%s],hosts.org_dir", name);
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result = nis_list(buf, EXPAND_NAME, NULL, NULL);
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/* If we do not find it, try it as original name. But if the
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database is correct, we should find it in the first case, too */
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if ((result->status != NIS_SUCCESS &&
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result->status != NIS_S_SUCCESS) ||
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result->objects.objects_val[0].zo_data.zo_type != ENTRY_OBJ ||
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strcmp(result->objects.objects_val[0].zo_data.objdata_u.en_data.en_type,
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"hosts_tbl") != 0 ||
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result->objects.objects_val[0].zo_data.objdata_u.en_data.en_cols.en_cols_len
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< 3)
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sprintf(buf, "[cname=%s],hosts.org_dir", name);
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else
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sprintf(buf, "[cname=%s],hosts.org_dir", NISENTRYVAL(0, 0, result));
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nis_freeresult (result);
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result = nis_list(buf, EXPAND_NAME, NULL, NULL);
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retval = niserr2nss (result->status);
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if (retval != NSS_STATUS_SUCCESS)
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{
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if (retval == NSS_STATUS_TRYAGAIN)
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{
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__set_errno (EAGAIN);
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*herrnop = NETDB_INTERNAL;
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}
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nis_freeresult (result);
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return retval;
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}
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parse_res = _nss_nisplus_parse_hostent (result, host, buffer, buflen);
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nis_freeresult (result);
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if (parse_res)
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return NSS_STATUS_SUCCESS;
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*herrnop = NETDB_INTERNAL;
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if (!parse_res && errno == ERANGE)
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return NSS_STATUS_TRYAGAIN;
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else
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return NSS_STATUS_NOTFOUND;
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}
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}
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enum nss_status
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_nss_nisplus_gethostbyname_r (const char *name, struct hostent *host,
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char *buffer, size_t buflen, int *h_errnop)
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{
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if (_res.options & RES_USE_INET6)
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{
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enum nss_status status;
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status = _nss_nisplus_gethostbyname2_r (name, AF_INET6, host, buffer,
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buflen, h_errnop);
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if (status == NSS_STATUS_SUCCESS)
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return status;
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}
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return _nss_nisplus_gethostbyname2_r (name, AF_INET, host, buffer,
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buflen, h_errnop);
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}
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enum nss_status
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_nss_nisplus_gethostbyaddr_r (const char *addr, struct hostent *host,
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char *buffer, size_t buflen, int *herrnop)
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{
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if (addr == NULL)
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return NSS_STATUS_NOTFOUND;
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else
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{
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nis_result *result;
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char buf[24 + strlen (addr)];
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int retval, parse_res;
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sprintf(buf, "[addr=%s],hosts.org_dir", addr);
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result = nis_list(buf, EXPAND_NAME, NULL, NULL);
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retval = niserr2nss (result->status);
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if (retval != NSS_STATUS_SUCCESS)
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{
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if (retval == NSS_STATUS_TRYAGAIN)
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{
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__set_errno (EAGAIN);
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*herrnop = NETDB_INTERNAL;
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}
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nis_freeresult (result);
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return retval;
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}
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parse_res = _nss_nisplus_parse_hostent (result, host, buffer, buflen);
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nis_freeresult (result);
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if (parse_res)
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return NSS_STATUS_SUCCESS;
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*herrnop = NETDB_INTERNAL;
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if (!parse_res && errno == ERANGE)
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return NSS_STATUS_TRYAGAIN;
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else
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return NSS_STATUS_NOTFOUND;
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}
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}
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