449 lines
11 KiB
C
449 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 <bits/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 tablename_val = NULL;
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static u_long tablename_len = 0;
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#define NISENTRYVAL(idx,col,res) \
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((res)->objects.objects_val[(idx)].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)].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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static int
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_nss_nisplus_parse_hostent (nis_result *result, int af, struct hostent *host,
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char *buffer, size_t buflen)
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{
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unsigned int i;
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char *first_unused = buffer;
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size_t room_left = buflen;
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char *data, *p, *line;
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if (result == NULL)
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return 0;
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if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS) ||
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__type_of (result->objects.objects_val) != ENTRY_OBJ ||
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strcmp(result->objects.objects_val[0].EN_data.en_type,
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"hosts_tbl") != 0 ||
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result->objects.objects_val[0].EN_data.en_cols.en_cols_len < 4)
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return 0;
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if (room_left < NISENTRYLEN (0, 2, result) + 1)
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{
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no_more_room:
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__set_errno (ERANGE);
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return -1;
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}
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data = first_unused;
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if (inet_pton (af, NISENTRYVAL (0, 2, result), data) < 1)
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/* Illegal address: ignore line. */
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return 0;
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host->h_addrtype = af;
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if (af == AF_INET6)
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host->h_length = IN6ADDRSZ;
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else
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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 (data, data);
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host->h_addrtype = AF_INET6;
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host->h_length = IN6ADDRSZ;
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}
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else
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{
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host->h_addrtype = AF_INET;
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host->h_length = INADDRSZ;
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}
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}
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first_unused+=host->h_length;
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room_left-=host->h_length;
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if (NISENTRYLEN (0, 0, result) + 1 > room_left)
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goto no_more_room;
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p = stpncpy (first_unused, NISENTRYVAL (0, 0, result),
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NISENTRYLEN (0, 0, result));
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*p = '\0';
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room_left -= (NISENTRYLEN (0, 0, result) + 1);
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host->h_name = first_unused;
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first_unused += NISENTRYLEN (0, 0, result) +1;
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p = first_unused;
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line = p;
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for (i = 0; i < result->objects.objects_len; i++)
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{
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if (strcmp (NISENTRYVAL (i, 1, result), host->h_name) != 0)
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{
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if (NISENTRYLEN (i, 1, result) + 2 > room_left)
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goto no_more_room;
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*p++ = ' ';
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p = stpncpy (p, NISENTRYVAL (i, 1, result),
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NISENTRYLEN (i, 1, result));
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*p = '\0';
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room_left -= (NISENTRYLEN (i, 1, result) + 1);
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}
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}
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++p;
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first_unused = p;
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/* Adjust the pointer so it is aligned for
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storing pointers. */
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first_unused += __alignof__ (char *) - 1;
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first_unused -= ((first_unused - (char *) 0) % __alignof__ (char *));
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host->h_addr_list = (char **) first_unused;
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if (room_left < 2 * sizeof (char *))
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goto no_more_room;
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room_left -= (2 * sizeof (char *));
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host->h_addr_list[0] = data;
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host->h_addr_list[1] = NULL;
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host->h_aliases = &host->h_addr_list[2];
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host->h_aliases[0] = NULL;
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i = 0;
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while (*line != '\0')
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{
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/* Skip leading blanks. */
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while (isspace (*line))
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line++;
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if (*line == '\0')
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break;
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if (room_left < sizeof (char *))
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goto no_more_room;
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room_left -= sizeof (char *);
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host->h_aliases[i] = line;
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while (*line != '\0' && *line != ' ')
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++line;
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if (*line == ' ')
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{
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*line = '\0';
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++line;
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++i;
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}
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else
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host->h_aliases[i+1] = NULL;
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}
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return 1;
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}
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static enum nss_status
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_nss_create_tablename (void)
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{
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if (tablename_val == NULL)
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{
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char buf [40 + strlen (nis_local_directory ())];
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char *p;
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p = stpcpy (buf, "hosts.org_dir.");
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p = stpcpy (p, nis_local_directory ());
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tablename_val = strdup (buf);
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if (tablename_val == NULL)
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return NSS_STATUS_TRYAGAIN;
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tablename_len = strlen (tablename_val);
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}
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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_sethostent (void)
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{
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enum nss_status status = NSS_STATUS_SUCCESS;
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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 (tablename_val == NULL)
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if (_nss_create_tablename() != NSS_STATUS_SUCCESS)
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status = NSS_STATUS_UNAVAIL;
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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_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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__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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nis_result *saved_res;
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if (result == NULL)
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{
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saved_res = NULL;
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if (tablename_val == NULL)
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if (_nss_create_tablename() != NSS_STATUS_SUCCESS)
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return NSS_STATUS_UNAVAIL;
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result = nis_first_entry(tablename_val);
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if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
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{
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enum nss_status 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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saved_res = result;
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res2 = nis_next_entry(tablename_val, &result->cookie);
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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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enum nss_status retval= niserr2nss (result->status);
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nis_freeresult (result);
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result = saved_res;
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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, AF_INET6,
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host, buffer, buflen);
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if (parse_res < 1 && errno != ERANGE)
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parse_res = _nss_nisplus_parse_hostent (result, AF_INET, host,
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buffer, buflen);
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if (parse_res < 1 && errno == ERANGE)
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{
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nis_freeresult (result);
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result = saved_res;
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*herrnop = NETDB_INTERNAL;
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return NSS_STATUS_TRYAGAIN;
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}
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if (saved_res != NULL)
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nis_freeresult (saved_res);
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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 (tablename_val == NULL)
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if (_nss_create_tablename() != NSS_STATUS_SUCCESS)
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{
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*herrnop = NETDB_INTERNAL;
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return NSS_STATUS_UNAVAIL;
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}
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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 + tablename_len];
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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],%s", name, tablename_val);
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result = nis_list(buf, FOLLOW_PATH | FOLLOW_LINKS, 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 && result->status != NIS_S_SUCCESS) ||
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__type_of (result->objects.objects_val) != ENTRY_OBJ ||
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strcmp(result->objects.objects_val->EN_data.en_type,
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"hosts_tbl") != 0 ||
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result->objects.objects_val->EN_data.en_cols.en_cols_len < 3)
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sprintf(buf, "[cname=%s],%s", name, tablename_val);
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else
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sprintf(buf, "[cname=%s],%s", NISENTRYVAL(0, 0, result),
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tablename_val);
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nis_freeresult (result);
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result = nis_list(buf, FOLLOW_PATH | FOLLOW_LINKS, 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 =
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_nss_nisplus_parse_hostent (result, af, host, buffer, buflen);
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nis_freeresult (result);
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if (parse_res > 0)
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return NSS_STATUS_SUCCESS;
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*herrnop = NETDB_INTERNAL;
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if (parse_res == -1)
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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, int addrlen, int type,
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struct hostent *host, char *buffer,
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size_t buflen, int *herrnop)
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{
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if (tablename_val == NULL)
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if (_nss_create_tablename() != NSS_STATUS_SUCCESS)
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return NSS_STATUS_UNAVAIL;
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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[255 + tablename_len];
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int retval, parse_res;
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snprintf(buf, sizeof (buf) -1, "[addr=%s],%s",
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inet_ntoa (*(struct in_addr *)addr), tablename_val);
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result = nis_list(buf, FOLLOW_PATH | FOLLOW_LINKS, 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, type, host,
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buffer, buflen);
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nis_freeresult (result);
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if (parse_res > 0)
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return NSS_STATUS_SUCCESS;
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*herrnop = NETDB_INTERNAL;
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if (parse_res == -1)
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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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