| /* Copyright (C) 1997, 1998 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Thorsten Kukuk <kukuk@uni-paderborn.de>, 1997. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Library General Public License as |
| published by the Free Software Foundation; either version 2 of the |
| License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Library General Public License for more details. |
| |
| You should have received a copy of the GNU Library General Public |
| License along with the GNU C Library; see the file COPYING.LIB. If not, |
| write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include <string.h> |
| #include <rpcsvc/nis.h> |
| #include "nis_xdr.h" |
| #include "nis_intern.h" |
| |
| nis_result * |
| nis_lookup (const_nis_name name, const u_long flags) |
| { |
| nis_result *res = calloc (1, sizeof (nis_result)); |
| struct ns_request req; |
| nis_name *names; |
| nis_error status; |
| int link_first_try = 0; |
| int count_links = 0; /* We will follow only 16 links in the deep */ |
| int done = 0; |
| int name_nr = 0; |
| nis_name namebuf[2] = {NULL, NULL}; |
| |
| if (res == NULL) |
| return NULL; |
| |
| if ((flags & EXPAND_NAME) && (name[strlen (name) - 1] != '.')) |
| { |
| names = nis_getnames (name); |
| if (names == NULL) |
| { |
| NIS_RES_STATUS (res) = NIS_NAMEUNREACHABLE; |
| return res; |
| } |
| } |
| else |
| { |
| names = namebuf; |
| names[0] = (nis_name)name; |
| } |
| |
| req.ns_name = names[0]; |
| while (!done) |
| { |
| dir_binding bptr; |
| directory_obj *dir = NULL; |
| req.ns_object.ns_object_len = 0; |
| req.ns_object.ns_object_val = NULL; |
| |
| status = __nisfind_server (req.ns_name, &dir); |
| if (status != NIS_SUCCESS) |
| { |
| NIS_RES_STATUS (res) = status; |
| return res; |
| } |
| |
| status = __nisbind_create (&bptr, dir->do_servers.do_servers_val, |
| dir->do_servers.do_servers_len, flags); |
| if (status != NIS_SUCCESS) |
| { |
| NIS_RES_STATUS (res) = status; |
| nis_free_directory (dir); |
| return res; |
| } |
| |
| while (__nisbind_connect (&bptr) != NIS_SUCCESS) |
| { |
| if (__nisbind_next (&bptr) != NIS_SUCCESS) |
| { |
| __nisbind_destroy (&bptr); |
| nis_free_directory (dir); |
| NIS_RES_STATUS (res) = NIS_NAMEUNREACHABLE; |
| return res; |
| } |
| } |
| |
| do |
| { |
| static struct timeval RPCTIMEOUT = {10, 0}; |
| enum clnt_stat result; |
| |
| again: |
| result = clnt_call (bptr.clnt, NIS_LOOKUP, |
| (xdrproc_t) _xdr_ns_request, |
| (caddr_t) &req, (xdrproc_t) _xdr_nis_result, |
| (caddr_t) res, RPCTIMEOUT); |
| |
| if (result != RPC_SUCCESS) |
| status = NIS_RPCERROR; |
| else |
| { |
| if (NIS_RES_STATUS (res) == NIS_SUCCESS) |
| { |
| if (__type_of(NIS_RES_OBJECT (res)) == NIS_LINK_OBJ && |
| flags & FOLLOW_LINKS) /* We are following links */ |
| { |
| if (count_links) |
| free (req.ns_name); |
| /* if we hit the link limit, bail */ |
| if (count_links > NIS_MAXLINKS) |
| { |
| NIS_RES_STATUS (res) = NIS_LINKNAMEERROR; |
| break; |
| } |
| ++count_links; |
| req.ns_name = |
| strdup (NIS_RES_OBJECT (res)->LI_data.li_name); |
| nis_freeresult (res); |
| res = calloc (1, sizeof (nis_result)); |
| if (res == NULL) |
| { |
| __nisbind_destroy (&bptr); |
| nis_free_directory (dir); |
| return NULL; |
| } |
| link_first_try = 1; /* Try at first the old binding */ |
| goto again; |
| } |
| } |
| else |
| if ((NIS_RES_STATUS (res) == NIS_SYSTEMERROR) || |
| (NIS_RES_STATUS (res) == NIS_NOSUCHNAME) || |
| (NIS_RES_STATUS (res) == NIS_NOT_ME)) |
| { |
| if (link_first_try) |
| { |
| __nisbind_destroy (&bptr); |
| nis_free_directory (dir); |
| |
| if (__nisfind_server (req.ns_name, &dir) != NIS_SUCCESS) |
| return res; |
| |
| if (__nisbind_create (&bptr, |
| dir->do_servers.do_servers_val, |
| dir->do_servers.do_servers_len, |
| flags) != NIS_SUCCESS) |
| { |
| nis_free_directory (dir); |
| return res; |
| } |
| } |
| else |
| if (__nisbind_next (&bptr) != NIS_SUCCESS) |
| break; /* No more servers to search */ |
| |
| while (__nisbind_connect (&bptr) != NIS_SUCCESS) |
| { |
| if (__nisbind_next (&bptr) != NIS_SUCCESS) |
| { |
| __nisbind_destroy (&bptr); |
| nis_free_directory (dir); |
| return res; |
| } |
| } |
| goto again; |
| } |
| break; |
| } |
| link_first_try = 0; /* Set it back */ |
| status= NIS_SUCCESS; |
| } |
| while ((flags & HARD_LOOKUP) && status == NIS_RPCERROR); |
| |
| __nisbind_destroy (&bptr); |
| nis_free_directory (dir); |
| |
| if (status != NIS_SUCCESS) |
| { |
| NIS_RES_STATUS (res) = status; |
| return res; |
| } |
| |
| switch (NIS_RES_STATUS (res)) |
| { |
| case NIS_PARTIAL: |
| case NIS_SUCCESS: |
| case NIS_S_SUCCESS: |
| case NIS_LINKNAMEERROR: /* We follow to max links */ |
| case NIS_UNAVAIL: /* NIS+ is not installed, or all servers are down */ |
| ++done; |
| break; |
| default: |
| /* Try the next domainname if we don't follow a link */ |
| if (count_links) |
| { |
| free (req.ns_name); |
| NIS_RES_STATUS (res) = NIS_LINKNAMEERROR; |
| ++done; |
| break; |
| } |
| ++name_nr; |
| if (names[name_nr] == NULL) |
| { |
| ++done; |
| break; |
| } |
| req.ns_name = names[name_nr]; |
| break; |
| } |
| } |
| |
| if (names != namebuf) |
| nis_freenames (names); |
| |
| return res; |
| } |