422 lines
9.6 KiB
C
422 lines
9.6 KiB
C
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/* Copyright (C) 1996 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 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 <errno.h>
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#include <nss.h>
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#include <grp.h>
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#include <ctype.h>
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#include <libc-lock.h>
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#include <string.h>
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#include <rpcsvc/yp.h>
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#include <rpcsvc/ypclnt.h>
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/* Structure for remembering -@netgroup and -user members ... */
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#define BLACKLIST_INITIAL_SIZE 512
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#define BLACKLIST_INCREMENT 256
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struct blacklist_t
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{
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char *data;
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int current;
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int size;
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};
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struct ent_t
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{
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bool_t nis;
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bool_t nis_first;
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char *oldkey;
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int oldkeylen;
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FILE *stream;
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struct blacklist_t blacklist;
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};
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typedef struct ent_t ent_t;
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static ent_t ext_ent = {0, 0, NULL, 0, NULL, {NULL, 0, 0}};
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/* Protect global state against multiple changers. */
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__libc_lock_define_initialized (static, lock)
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/* Prototypes for local functions. */
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static void blacklist_store_name (const char *, ent_t *);
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static int in_blacklist (const char *, int, ent_t *);
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static enum nss_status
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internal_setgrent (ent_t *ent)
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{
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enum nss_status status = NSS_STATUS_SUCCESS;
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ent->nis = ent->nis_first = 0;
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if (ent->oldkey != NULL)
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{
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free (ent->oldkey);
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ent->oldkey = NULL;
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ent->oldkeylen = 0;
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}
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ent->blacklist.current = 0;
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if (ent->blacklist.data != NULL)
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ent->blacklist.data[0] = '\0';
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if (ent->stream == NULL)
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{
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ent->stream = fopen ("/etc/group", "r");
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if (ent->stream == NULL)
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status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
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}
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else
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rewind (ent->stream);
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return status;
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}
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enum nss_status
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_nss_compat_setgrent (void)
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{
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enum nss_status result;
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__libc_lock_lock (lock);
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result = internal_setgrent (&ext_ent);
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__libc_lock_unlock (lock);
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return result;
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}
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static enum nss_status
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internal_endgrent (ent_t *ent)
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{
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if (ent->stream != NULL)
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{
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fclose (ent->stream);
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ent->stream = NULL;
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}
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ent->nis = ent->nis_first = 0;
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if (ent->oldkey != NULL)
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{
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free (ent->oldkey);
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ent->oldkey = NULL;
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ent->oldkeylen = 0;
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}
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ent->blacklist.current = 0;
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if (ent->blacklist.data != NULL)
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ent->blacklist.data[0] = '\0';
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return NSS_STATUS_SUCCESS;
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}
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enum nss_status
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_nss_compat_endgrent (void)
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{
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enum nss_status result;
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__libc_lock_lock (lock);
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result = internal_endgrent (&ext_ent);
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__libc_lock_unlock (lock);
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return result;
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}
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static enum nss_status
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getgrent_next_nis (struct group *result, ent_t *ent, char *buffer,
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size_t buflen)
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{
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char *domain;
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char *outkey, *outval;
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int outkeylen, outvallen;
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char *p;
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if (yp_get_default_domain (&domain) != YPERR_SUCCESS)
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{
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ent->nis = 0;
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return NSS_STATUS_NOTFOUND;
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}
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do
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{
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if (ent->nis_first)
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{
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if (yp_first (domain, "group.byname", &outkey, &outkeylen,
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&outval, &outvallen) != YPERR_SUCCESS)
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{
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ent->nis = 0;
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return NSS_STATUS_UNAVAIL;
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}
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ent->oldkey = outkey;
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ent->oldkeylen = outkeylen;
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ent->nis_first = FALSE;
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}
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else
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{
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if (yp_next (domain, "group.byname", ent->oldkey, ent->oldkeylen,
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&outkey, &outkeylen, &outval, &outvallen)
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!= YPERR_SUCCESS)
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{
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ent->nis = 0;
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return NSS_STATUS_NOTFOUND;
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}
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free (ent->oldkey);
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ent->oldkey = outkey;
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ent->oldkeylen = outkeylen;
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}
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/* Copy the found data to our buffer */
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p = strncpy (buffer, outval, buflen);
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/* ...and free the data. */
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free (outval);
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while (isspace (*p))
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++p;
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}
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while (!_nss_files_parse_grent (p, result, buffer, buflen));
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if (!in_blacklist (result->gr_name, strlen (result->gr_name), ent))
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return NSS_STATUS_SUCCESS;
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else
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return NSS_STATUS_NOTFOUND;
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}
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static enum nss_status
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getgrent_next_file (struct group *result, ent_t *ent,
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char *buffer, size_t buflen)
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{
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while (1)
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{
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char *p;
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do
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{
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p = fgets (buffer, buflen, ent->stream);
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if (p == NULL)
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return NSS_STATUS_NOTFOUND;
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/* Terminate the line for any case. */
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buffer[buflen - 1] = '\0';
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/* Skip leading blanks. */
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while (isspace (*p))
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++p;
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}
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/* Ignore empty and comment lines. */
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while (*p == '\0' || *p == '#' ||
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/* Parse the line. If it is invalid, loop to
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get the next line of the file to parse. */
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!_nss_files_parse_grent (p, result, buffer, buflen));
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if (result->gr_name[0] != '+' && result->gr_name[0] != '-')
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/* This is a real entry. */
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break;
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/* -group */
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if (result->gr_name[0] == '-' && result->gr_name[1] != '\0'
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&& result->gr_name[1] != '@')
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{
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blacklist_store_name (&result->gr_name[1], ent);
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continue;
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}
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/* +group */
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if (result->gr_name[0] == '+' && result->gr_name[1] != '\0'
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&& result->gr_name[1] != '@')
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{
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char *domain;
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char *outval;
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int outvallen;
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if (yp_get_default_domain (&domain) != YPERR_SUCCESS)
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/* XXX Should we regard this as an fatal error? I don't
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think so. Just continue working. --drepper@gnu */
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continue;
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if (yp_match (domain, "group.byname", &result->gr_name[1],
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strlen (result->gr_name) - 1, &outval, &outvallen)
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!= YPERR_SUCCESS)
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continue;
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p = strncpy (buffer, outval, buflen);
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while (isspace (*p))
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p++;
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free (outval);
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if (_nss_files_parse_grent (p, result, buffer, buflen))
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/* We found the entry. */
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break;
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}
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/* +:... */
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if (result->gr_name[0] == '+' && result->gr_name[1] == '\0')
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{
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ent->nis = TRUE;
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ent->nis_first = TRUE;
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return getgrent_next_nis (result, ent, buffer, buflen);
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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 enum nss_status
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internal_getgrent_r (struct group *gr, ent_t *ent, char *buffer,
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size_t buflen)
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{
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if (ent->nis)
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return getgrent_next_nis (gr, ent, buffer, buflen);
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else
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return getgrent_next_file (gr, ent, buffer, buflen);
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}
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enum nss_status
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_nss_compat_getgrent_r (struct group *grp, char *buffer, size_t buflen)
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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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/* Be prepared that the setgrent function was not called before. */
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if (ext_ent.stream == NULL)
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status = internal_setgrent (&ext_ent);
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if (status == NSS_STATUS_SUCCESS)
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status = internal_getgrent_r (grp, &ext_ent, buffer, buflen);
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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_compat_getgrnam_r (const char *name, struct group *grp,
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char *buffer, size_t buflen)
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{
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ent_t ent = {0, 0, NULL, 0, NULL, {NULL, 0, 0}};
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enum nss_status status;
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if (name[0] == '-' || name[0] == '+')
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return NSS_STATUS_NOTFOUND;
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status = internal_setgrent (&ent);
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if (status != NSS_STATUS_SUCCESS)
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return status;
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while ((status = internal_getgrent_r (grp, &ent, buffer, buflen))
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== NSS_STATUS_SUCCESS)
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if (strcmp (grp->gr_name, name) == 0)
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break;
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internal_endgrent (&ent);
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return status;
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}
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enum nss_status
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_nss_compat_getgrgid_r (gid_t gid, struct group *grp,
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char *buffer, size_t buflen)
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{
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ent_t ent = {0, 0, NULL, 0, NULL, {NULL, 0, 0}};
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enum nss_status status;
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status = internal_setgrent (&ent);
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if (status != NSS_STATUS_SUCCESS)
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return status;
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while ((status = internal_getgrent_r (grp, &ent, buffer, buflen))
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== NSS_STATUS_SUCCESS)
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if (grp->gr_gid == gid && grp->gr_name[0] != '+' && grp->gr_name[0] != '-')
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break;
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internal_endgrent (&ent);
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return status;
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}
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/* Support routines for remembering -@netgroup and -user entries.
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The names are stored in a single string with `|' as separator. */
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static void
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blacklist_store_name (const char *name, ent_t *ent)
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{
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int namelen = strlen (name);
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char *tmp;
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/* first call, setup cache */
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if (ent->blacklist.size == 0)
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{
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ent->blacklist.size = MAX (BLACKLIST_INITIAL_SIZE, 2 * namelen);
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ent->blacklist.data = malloc (ent->blacklist.size);
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if (ent->blacklist.data == NULL)
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return;
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ent->blacklist.data[0] = '|';
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ent->blacklist.data[1] = '\0';
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ent->blacklist.current = 1;
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}
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else
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{
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if (in_blacklist (name, namelen, ent))
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return; /* no duplicates */
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if (ent->blacklist.current + namelen + 1 >= ent->blacklist.size)
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{
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ent->blacklist.size += MAX (BLACKLIST_INCREMENT, 2 * namelen);
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tmp = realloc (ent->blacklist.data, ent->blacklist.size);
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if (tmp == NULL)
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{
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free (ent->blacklist.data);
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ent->blacklist.size = 0;
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return;
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}
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ent->blacklist.data = tmp;
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}
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}
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tmp = stpcpy (ent->blacklist.data + ent->blacklist.current, name);
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*tmp++ = '|';
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*tmp = '\0';
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ent->blacklist.current += namelen + 1;
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return;
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}
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/* returns TRUE if ent->blacklist contains name, else FALSE */
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static bool_t
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in_blacklist (const char *name, int namelen, ent_t *ent)
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{
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char buf[namelen + 3];
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if (ent->blacklist.data == NULL)
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return FALSE;
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stpcpy (stpcpy (stpcpy (buf, "|"), name), "|");
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return strstr (ent->blacklist.data, buf) != NULL;
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}
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