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409 lines
9.1 KiB
C
409 lines
9.1 KiB
C
/* Copyright (C) 1997-2016 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 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, see
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<http://www.gnu.org/licenses/>. */
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#include <atomic.h>
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#include <nss.h>
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#include <errno.h>
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#include <pwd.h>
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#include <string.h>
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#include <libc-lock.h>
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#include <rpcsvc/nis.h>
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#include "nss-nisplus.h"
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#include "nisplus-parser.h"
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#include <libnsl.h>
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#include <nis_intern.h>
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#include <nis_xdr.h>
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__libc_lock_define_initialized (static, lock)
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/* Connection information. */
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static ib_request *ibreq;
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static directory_obj *dir;
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static dir_binding bptr;
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static char *tablepath;
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static char *tableptr;
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/* Cursor. */
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static netobj cursor;
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nis_name pwd_tablename_val attribute_hidden;
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size_t pwd_tablename_len attribute_hidden;
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enum nss_status
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_nss_pwd_create_tablename (int *errnop)
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{
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if (pwd_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[] = "passwd.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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pwd_tablename_len = sizeof (prefix) - 1 + local_dir_len;
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atomic_write_barrier ();
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if (atomic_compare_and_exchange_bool_acq (&pwd_tablename_val, p, NULL))
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{
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/* Another thread already installed the value. */
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free (p);
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pwd_tablename_len = strlen (pwd_tablename_val);
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}
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}
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return NSS_STATUS_SUCCESS;
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}
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static void
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internal_nisplus_endpwent (void)
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{
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__nisbind_destroy (&bptr);
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memset (&bptr, '\0', sizeof (bptr));
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nis_free_directory (dir);
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dir = NULL;
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nis_free_request (ibreq);
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ibreq = NULL;
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xdr_free ((xdrproc_t) xdr_netobj, (char *) &cursor);
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memset (&cursor, '\0', sizeof (cursor));
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free (tablepath);
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tableptr = tablepath = NULL;
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}
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static enum nss_status
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internal_nisplus_setpwent (int *errnop)
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{
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enum nss_status status = NSS_STATUS_SUCCESS;
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if (pwd_tablename_val == NULL)
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status = _nss_pwd_create_tablename (errnop);
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if (status == NSS_STATUS_SUCCESS)
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{
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ibreq = __create_ib_request (pwd_tablename_val, 0);
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if (ibreq == 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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nis_error retcode = __prepare_niscall (pwd_tablename_val, &dir,
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&bptr, 0);
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if (retcode != NIS_SUCCESS)
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{
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nis_free_request (ibreq);
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ibreq = NULL;
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status = niserr2nss (retcode);
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}
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}
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return status;
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}
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enum nss_status
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_nss_nisplus_setpwent (int stayopen)
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{
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enum nss_status status;
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__libc_lock_lock (lock);
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internal_nisplus_endpwent ();
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// XXX We need to be able to set errno. Pass in new parameter.
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int err;
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status = internal_nisplus_setpwent (&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_endpwent (void)
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{
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__libc_lock_lock (lock);
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internal_nisplus_endpwent ();
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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_getpwent_r (struct passwd *pw, char *buffer, size_t buflen,
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int *errnop)
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{
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int parse_res = -1;
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enum nss_status retval = NSS_STATUS_SUCCESS;
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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_error status;
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nis_result result;
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memset (&result, '\0', sizeof (result));
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if (cursor.n_bytes == NULL)
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{
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if (ibreq == NULL)
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{
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retval = internal_nisplus_setpwent (errnop);
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if (retval != NSS_STATUS_SUCCESS)
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return retval;
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}
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status = __do_niscall3 (&bptr, NIS_IBFIRST,
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(xdrproc_t) _xdr_ib_request,
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(caddr_t) ibreq,
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(xdrproc_t) _xdr_nis_result,
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(caddr_t) &result,
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0, NULL);
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}
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else
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{
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ibreq->ibr_cookie.n_bytes = cursor.n_bytes;
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ibreq->ibr_cookie.n_len = cursor.n_len;
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status = __do_niscall3 (&bptr, NIS_IBNEXT,
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(xdrproc_t) _xdr_ib_request,
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(caddr_t) ibreq,
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(xdrproc_t) _xdr_nis_result,
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(caddr_t) &result,
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0, NULL);
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ibreq->ibr_cookie.n_bytes = NULL;
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ibreq->ibr_cookie.n_len = 0;
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}
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if (status != NIS_SUCCESS)
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return niserr2nss (status);
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if (NIS_RES_STATUS (&result) == NIS_NOTFOUND)
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{
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/* No more entries on this server. This means we have to go
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to the next server on the path. */
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status = __follow_path (&tablepath, &tableptr, ibreq, &bptr);
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if (status != NIS_SUCCESS)
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return niserr2nss (status);
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directory_obj *newdir = NULL;
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dir_binding newbptr;
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status = __prepare_niscall (ibreq->ibr_name, &newdir, &newbptr, 0);
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if (status != NIS_SUCCESS)
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return niserr2nss (status);
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nis_free_directory (dir);
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dir = newdir;
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__nisbind_destroy (&bptr);
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bptr = newbptr;
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xdr_free ((xdrproc_t) xdr_netobj, (char *) &result.cookie);
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result.cookie.n_bytes = NULL;
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result.cookie.n_len = 0;
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parse_res = 0;
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goto next;
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}
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else if (NIS_RES_STATUS (&result) != NIS_SUCCESS)
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return niserr2nss (NIS_RES_STATUS (&result));
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parse_res = _nss_nisplus_parse_pwent (&result, pw, buffer,
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buflen, errnop);
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if (__glibc_unlikely (parse_res == -1))
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{
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*errnop = ERANGE;
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retval = NSS_STATUS_TRYAGAIN;
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goto freeres;
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}
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next:
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/* Free the old cursor. */
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xdr_free ((xdrproc_t) xdr_netobj, (char *) &cursor);
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/* Remember the new one. */
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cursor.n_bytes = result.cookie.n_bytes;
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cursor.n_len = result.cookie.n_len;
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/* Free the result structure. NB: we do not remove the cookie. */
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result.cookie.n_bytes = NULL;
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result.cookie.n_len = 0;
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freeres:
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xdr_free ((xdrproc_t) _xdr_nis_result, (char *) &result);
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memset (&result, '\0', sizeof (result));
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}
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while (!parse_res);
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return retval;
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}
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enum nss_status
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_nss_nisplus_getpwent_r (struct passwd *result, char *buffer, size_t buflen,
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int *errnop)
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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_getpwent_r (result, buffer, buflen, errnop);
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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_getpwnam_r (const char *name, struct passwd *pw,
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char *buffer, size_t buflen, int *errnop)
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{
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int parse_res;
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if (pwd_tablename_val == NULL)
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{
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enum nss_status status = _nss_pwd_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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if (name == NULL)
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{
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*errnop = EINVAL;
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return NSS_STATUS_UNAVAIL;
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}
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nis_result *result;
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char buf[strlen (name) + 9 + pwd_tablename_len];
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int olderr = errno;
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snprintf (buf, sizeof (buf), "[name=%s],%s", name, pwd_tablename_val);
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result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM, NULL, NULL);
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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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if (__glibc_unlikely (niserr2nss (result->status) != NSS_STATUS_SUCCESS))
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{
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enum nss_status status = niserr2nss (result->status);
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__set_errno (olderr);
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nis_freeresult (result);
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return status;
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}
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parse_res = _nss_nisplus_parse_pwent (result, pw, buffer, buflen, errnop);
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nis_freeresult (result);
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if (__glibc_unlikely (parse_res < 1))
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{
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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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else
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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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}
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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_getpwuid_r (const uid_t uid, struct passwd *pw,
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char *buffer, size_t buflen, int *errnop)
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{
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if (pwd_tablename_val == NULL)
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{
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enum nss_status status = _nss_pwd_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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int parse_res;
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nis_result *result;
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char buf[8 + 3 * sizeof (unsigned long int) + pwd_tablename_len];
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int olderr = errno;
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snprintf (buf, sizeof (buf), "[uid=%lu],%s",
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(unsigned long int) uid, pwd_tablename_val);
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result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM, NULL, NULL);
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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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if (__glibc_unlikely (niserr2nss (result->status) != NSS_STATUS_SUCCESS))
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{
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enum nss_status status = niserr2nss (result->status);
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__set_errno (olderr);
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nis_freeresult (result);
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return status;
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}
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parse_res = _nss_nisplus_parse_pwent (result, pw, buffer, buflen, errnop);
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nis_freeresult (result);
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if (__glibc_unlikely (parse_res < 1))
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{
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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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else
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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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}
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return NSS_STATUS_SUCCESS;
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}
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