282 lines
6.4 KiB
C
282 lines
6.4 KiB
C
/* Copyright (C) 1996-2013 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>, 1996.
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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 <nss.h>
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#include <ctype.h>
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#include <errno.h>
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#include <string.h>
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#include <aliases.h>
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#include <bits/libc-lock.h>
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#include <rpcsvc/yp.h>
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#include <rpcsvc/ypclnt.h>
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#include "nss-nis.h"
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__libc_lock_define_initialized (static, lock)
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static bool_t new_start = 1;
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static char *oldkey;
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static int oldkeylen;
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static int
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_nss_nis_parse_aliasent (const char *key, char *alias, struct aliasent *result,
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char *buffer, size_t buflen, int *errnop)
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{
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char *first_unused = buffer + strlen (alias) + 1;
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size_t room_left =
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buflen - (buflen % __alignof__ (char *)) - strlen (alias) - 2;
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char *line;
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char *cp;
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result->alias_members_len = 0;
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*first_unused = '\0';
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first_unused++;
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strcpy (first_unused, key);
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if (first_unused[room_left - 1] != '\0')
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{
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/* The line is too long for our buffer. */
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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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result->alias_name = first_unused;
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/* Terminate the line for any case. */
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cp = strpbrk (alias, "#\n");
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if (cp != NULL)
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*cp = '\0';
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first_unused += strlen (result->alias_name) + 1;
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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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result->alias_members = (char **) first_unused;
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line = alias;
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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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result->alias_members[result->alias_members_len] = line;
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while (*line != '\0' && *line != ',')
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line++;
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if (line != result->alias_members[result->alias_members_len])
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{
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*line = '\0';
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line++;
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result->alias_members_len++;
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}
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}
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return result->alias_members_len == 0 ? 0 : 1;
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}
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enum nss_status
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_nss_nis_setaliasent (void)
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{
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__libc_lock_lock (lock);
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new_start = 1;
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if (oldkey != NULL)
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{
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free (oldkey);
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oldkey = NULL;
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oldkeylen = 0;
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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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/* The 'endaliasent' function is identical. */
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strong_alias (_nss_nis_setaliasent, _nss_nis_endaliasent)
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static enum nss_status
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internal_nis_getaliasent_r (struct aliasent *alias, char *buffer,
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size_t buflen, int *errnop)
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{
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char *domain;
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if (__builtin_expect (yp_get_default_domain (&domain), 0))
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return NSS_STATUS_UNAVAIL;
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alias->alias_local = 0;
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/* Get the next entry until we found a correct one. */
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int parse_res;
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do
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{
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char *result;
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int len;
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char *outkey;
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int keylen;
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int yperr;
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if (new_start)
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yperr = yp_first (domain, "mail.aliases", &outkey, &keylen, &result,
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&len);
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else
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yperr = yp_next (domain, "mail.aliases", oldkey, oldkeylen, &outkey,
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&keylen, &result, &len);
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if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
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{
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enum nss_status retval = yperr2nss (yperr);
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if (retval == NSS_STATUS_TRYAGAIN)
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*errnop = errno;
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return retval;
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}
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if (__builtin_expect ((size_t) (len + 1) > buflen, 0))
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{
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free (result);
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*errnop = ERANGE;
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return NSS_STATUS_TRYAGAIN;
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}
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char *p = strncpy (buffer, result, len);
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buffer[len] = '\0';
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while (isspace (*p))
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++p;
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free (result);
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parse_res = _nss_nis_parse_aliasent (outkey, p, alias, buffer,
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buflen, errnop);
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if (__builtin_expect (parse_res == -1, 0))
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{
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free (outkey);
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*errnop = ERANGE;
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return NSS_STATUS_TRYAGAIN;
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}
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free (oldkey);
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oldkey = outkey;
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oldkeylen = keylen;
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new_start = 0;
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}
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while (!parse_res);
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return NSS_STATUS_SUCCESS;
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}
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enum nss_status
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_nss_nis_getaliasent_r (struct aliasent *alias, char *buffer, size_t buflen,
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int *errnop)
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{
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enum nss_status status;
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__libc_lock_lock (lock);
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status = internal_nis_getaliasent_r (alias, 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_nis_getaliasbyname_r (const char *name, struct aliasent *alias,
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char *buffer, size_t buflen, int *errnop)
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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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char *domain;
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if (__builtin_expect (yp_get_default_domain (&domain), 0))
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return NSS_STATUS_UNAVAIL;
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size_t namlen = strlen (name);
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char *name2;
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int use_alloca = __libc_use_alloca (namlen + 1);
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if (use_alloca)
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name2 = __alloca (namlen + 1);
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else
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{
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name2 = malloc (namlen + 1);
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if (name2 == 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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}
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/* Convert name to lowercase. */
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size_t i;
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for (i = 0; i < namlen; ++i)
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name2[i] = _tolower (name[i]);
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name2[i] = '\0';
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char *result;
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int len;
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int yperr = yp_match (domain, "mail.aliases", name2, namlen, &result, &len);
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if (!use_alloca)
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free (name2);
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if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
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{
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enum nss_status retval = yperr2nss (yperr);
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if (retval == NSS_STATUS_TRYAGAIN)
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*errnop = errno;
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return retval;
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}
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if (__builtin_expect ((size_t) (len + 1) > buflen, 0))
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{
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free (result);
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*errnop = ERANGE;
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return NSS_STATUS_TRYAGAIN;
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}
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char *p = strncpy (buffer, result, len);
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buffer[len] = '\0';
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while (isspace (*p))
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++p;
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free (result);
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alias->alias_local = 0;
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int parse_res = _nss_nis_parse_aliasent (name, p, alias, buffer, buflen,
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errnop);
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if (__builtin_expect (parse_res < 1, 0))
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{
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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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return NSS_STATUS_SUCCESS;
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}
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