550 lines
13 KiB
C
550 lines
13 KiB
C
/* Copyright (C) 1997-2002, 2003, 2005, 2006 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@suse.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 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 <atomic.h>
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#include <ctype.h>
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#include <errno.h>
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#include <netdb.h>
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#include <nss.h>
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#include <string.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <rpcsvc/nis.h>
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#include <bits/libc-lock.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;
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static nis_name tablename_val;
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static u_long tablename_len;
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#define NISENTRYVAL(idx, col, res) \
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(NIS_RES_OBJECT (res)[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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(NIS_RES_OBJECT (res)[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, int *errnop,
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int flags)
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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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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 (NIS_RES_OBJECT (result)) != NIS_ENTRY_OBJ ||
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strcmp(NIS_RES_OBJECT (result)[0].EN_data.en_type, "hosts_tbl") != 0 ||
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NIS_RES_OBJECT (result)[0].EN_data.en_cols.en_cols_len < 4)
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return 0;
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char *data = first_unused;
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if (room_left < (af == AF_INET6 || (flags & AI_V4MAPPED) != 0
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? IN6ADDRSZ : INADDRSZ))
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{
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no_more_room:
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*errnop = ERANGE;
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return -1;
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}
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/* Parse address. */
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if (af == AF_INET && inet_pton (af, NISENTRYVAL (0, 2, result), data) > 0)
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{
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if (flags & AI_V4MAPPED)
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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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else if (af == AF_INET6
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&& inet_pton (AF_INET6, NISENTRYVAL (0, 2, result), data) > 0)
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{
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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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/* Illegal address: ignore line. */
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return 0;
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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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host->h_name = first_unused;
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first_unused = __stpncpy (first_unused, NISENTRYVAL (0, 0, result),
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NISENTRYLEN (0, 0, result));
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*first_unused++ = '\0';
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room_left -= NISENTRYLEN (0, 0, result) + 1;
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/* XXX Rewrite at some point to allocate the array first and then
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copy the strings. It wasteful to first concatenate the strings
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to just split them again later. */
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char *line = first_unused;
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for (i = 0; i < NIS_RES_NUMOBJ (result); ++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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*first_unused++ = ' ';
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first_unused = __stpncpy (first_unused, NISENTRYVAL (i, 1, result),
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NISENTRYLEN (i, 1, result));
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*first_unused = '\0';
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room_left -= NISENTRYLEN (i, 1, result) + 1;
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}
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}
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*first_unused++ = '\0';
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/* Adjust the pointer so it is aligned for
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storing pointers. */
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size_t adjust = ((__alignof__ (char *)
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- (first_unused - (char *) 0) % __alignof__ (char *))
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% __alignof__ (char *));
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if (room_left < adjust + 3 * sizeof (char *))
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goto no_more_room;
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first_unused += adjust;
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room_left -= adjust;
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host->h_addr_list = (char **) first_unused;
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room_left -= 3 * 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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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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*line++ = '\0';
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}
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host->h_aliases[i] = NULL;
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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 (int *errnop)
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{
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if (tablename_val == NULL)
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{
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const char *local_dir = nis_local_directory ();
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size_t local_dir_len = strlen (local_dir);
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static const char prefix[] = "hosts.org_dir.";
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char *p = malloc (sizeof (prefix) + local_dir_len);
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if (p == NULL)
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{
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*errnop = errno;
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return NSS_STATUS_TRYAGAIN;
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}
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memcpy (__stpcpy (p, prefix), local_dir, local_dir_len + 1);
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tablename_len = sizeof (prefix) - 1 + local_dir_len;
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atomic_write_barrier ();
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tablename_val = p;
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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 (int stayopen)
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{
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enum nss_status status = NSS_STATUS_SUCCESS;
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int err;
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__libc_lock_lock (lock);
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if (result != NULL)
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{
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nis_freeresult (result);
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result = NULL;
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}
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if (tablename_val == NULL)
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status = _nss_create_tablename (&err);
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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 != NULL)
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{
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nis_freeresult (result);
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result = 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 *errnop, 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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{
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enum nss_status status = _nss_create_tablename (errnop);
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if (status != NSS_STATUS_SUCCESS)
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return status;
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}
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result = nis_first_entry (tablename_val);
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if (result == NULL)
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{
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*errnop = errno;
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return NSS_STATUS_TRYAGAIN;
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}
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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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*errnop = errno;
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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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saved_res = result;
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result = nis_next_entry (tablename_val, &result->cookie);
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if (result == NULL)
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{
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*errnop = errno;
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return NSS_STATUS_TRYAGAIN;
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}
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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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*errnop = errno;
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}
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return retval;
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}
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}
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if (_res.options & RES_USE_INET6)
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parse_res = _nss_nisplus_parse_hostent (result, AF_INET6, host, buffer,
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buflen, errnop, AI_V4MAPPED);
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else
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parse_res = _nss_nisplus_parse_hostent (result, AF_INET, host, buffer,
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buflen, errnop, 0);
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if (parse_res == -1)
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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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*errnop = ERANGE;
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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 *errnop, 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, errnop,
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herrnop);
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__libc_lock_unlock (lock);
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return status;
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}
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static enum nss_status
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internal_gethostbyname2_r (const char *name, int af, struct hostent *host,
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char *buffer, size_t buflen, int *errnop,
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int *herrnop, int flags)
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{
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int parse_res, retval;
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if (tablename_val == NULL)
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{
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__libc_lock_lock (lock);
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enum nss_status status = _nss_create_tablename (errnop);
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__libc_lock_unlock (lock);
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if (status != 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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}
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if (name == NULL)
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{
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*errnop = EINVAL;
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*herrnop = NETDB_INTERNAL;
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return NSS_STATUS_NOTFOUND;
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}
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nis_result *result;
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char buf[strlen (name) + 10 + tablename_len];
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int olderr = errno;
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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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snprintf (buf, sizeof (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 (result != NULL)
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{
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char *bufptr = buf;
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/* If we did 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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|| __type_of (result->objects.objects_val) != NIS_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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snprintf (buf, sizeof (buf), "[cname=%s],%s", name, tablename_val);
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else
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{
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/* We need to allocate a new buffer since there is no
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guarantee the returned name has a length limit. */
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const char *entryval = NISENTRYVAL(0, 0, result);
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size_t buflen = strlen (entryval) + 10 + tablename_len;
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bufptr = alloca (buflen);
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snprintf (bufptr, buflen, "[cname=%s],%s",
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entryval, tablename_val);
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}
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nis_freeresult (result);
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result = nis_list (bufptr, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
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}
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if (result == NULL)
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{
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*errnop = ENOMEM;
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return NSS_STATUS_TRYAGAIN;
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}
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retval = niserr2nss (result->status);
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if (__builtin_expect (retval != NSS_STATUS_SUCCESS, 0))
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{
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if (retval == NSS_STATUS_TRYAGAIN)
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{
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*errnop = errno;
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*herrnop = NETDB_INTERNAL;
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}
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else
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__set_errno (olderr);
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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, af, host, buffer,
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buflen, errnop, flags);
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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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{
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*errnop = ERANGE;
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return NSS_STATUS_TRYAGAIN;
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}
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__set_errno (olderr);
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return NSS_STATUS_NOTFOUND;
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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 *errnop,
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int *herrnop)
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{
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return internal_gethostbyname2_r (name, af, host, buffer, buflen, errnop,
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herrnop,
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((_res.options & RES_USE_INET6) ? AI_V4MAPPED : 0));
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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 *errnop,
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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 = internal_gethostbyname2_r (name, AF_INET6, host, buffer,
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buflen, errnop, h_errnop,
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AI_V4MAPPED);
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if (status == NSS_STATUS_SUCCESS)
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return status;
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}
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return internal_gethostbyname2_r (name, AF_INET, host, buffer,
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buflen, errnop, h_errnop, 0);
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}
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enum nss_status
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_nss_nisplus_gethostbyaddr_r (const void *addr, socklen_t addrlen, int af,
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struct hostent *host, char *buffer,
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size_t buflen, int *errnop, int *herrnop)
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{
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if (tablename_val == NULL)
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{
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__libc_lock_lock (lock);
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enum nss_status status = _nss_create_tablename (errnop);
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__libc_lock_unlock (lock);
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if (status != NSS_STATUS_SUCCESS)
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return status;
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}
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if (addr == NULL)
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return NSS_STATUS_NOTFOUND;
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char buf[24 + tablename_len];
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int retval, parse_res;
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int olderr = errno;
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snprintf (buf, sizeof (buf), "[addr=%s],%s",
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inet_ntoa (*(const struct in_addr *) addr), tablename_val);
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nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
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if (result == NULL)
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{
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__set_errno (ENOMEM);
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return NSS_STATUS_TRYAGAIN;
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}
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retval = niserr2nss (result->status);
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if (__builtin_expect (retval != NSS_STATUS_SUCCESS, 0))
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{
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if (retval == NSS_STATUS_TRYAGAIN)
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{
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*errnop = errno;
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*herrnop = NETDB_INTERNAL;
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}
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else
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__set_errno (olderr);
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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, af, host,
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buffer, buflen, errnop,
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((_res.options & RES_USE_INET6)
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? AI_V4MAPPED : 0));
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nis_freeresult (result);
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|
|
if (parse_res > 0)
|
|
return NSS_STATUS_SUCCESS;
|
|
|
|
*herrnop = NETDB_INTERNAL;
|
|
if (parse_res == -1)
|
|
{
|
|
*errnop = ERANGE;
|
|
return NSS_STATUS_TRYAGAIN;
|
|
}
|
|
|
|
__set_errno (olderr);
|
|
return NSS_STATUS_NOTFOUND;
|
|
}
|