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glibc/nis/nss_compat/compat-grp.c

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/* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1996.
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 <errno.h>
#include <fcntl.h>
#include <nss.h>
#include <grp.h>
#include <ctype.h>
#include <bits/libc-lock.h>
#include <string.h>
#include <rpcsvc/yp.h>
#include <rpcsvc/ypclnt.h>
#include <rpcsvc/nis.h>
#include <nsswitch.h>
#include "nss-nisplus.h"
#include "nisplus-parser.h"
static service_user *ni = NULL;
static bool_t use_nisplus = FALSE; /* default: group_compat: nis */
static nis_name grptable = NULL; /* Name of the group table */
static size_t grptablelen = 0;
/* Get the declaration of the parser function. */
#define ENTNAME grent
#define STRUCTURE group
#define EXTERN_PARSER
#include <nss/nss_files/files-parse.c>
/* Structure for remembering -group members ... */
#define BLACKLIST_INITIAL_SIZE 512
#define BLACKLIST_INCREMENT 256
struct blacklist_t
{
char *data;
int current;
int size;
};
struct ent_t
{
bool_t nis;
bool_t nis_first;
char *oldkey;
int oldkeylen;
nis_result *result;
FILE *stream;
struct blacklist_t blacklist;
};
typedef struct ent_t ent_t;
static ent_t ext_ent = {0, 0, NULL, 0, NULL, NULL, {NULL, 0, 0}};
/* Protect global state against multiple changers. */
__libc_lock_define_initialized (static, lock)
/* Prototypes for local functions. */
static void blacklist_store_name (const char *, ent_t *);
static int in_blacklist (const char *, int, ent_t *);
static enum nss_status
_nss_first_init (void)
{
if (ni == NULL)
{
__nss_database_lookup ("group_compat", NULL, "nis", &ni);
use_nisplus = (strcmp (ni->name, "nisplus") == 0);
}
if (grptable == NULL)
{
static const char key[] = "group.org_dir.";
const char *local_dir = nis_local_directory ();
size_t len_local_dir = strlen (local_dir);
grptable = malloc (sizeof (key) + len_local_dir);
if (grptable == NULL)
return NSS_STATUS_TRYAGAIN;
grptablelen = ((char *) mempcpy (mempcpy (grptable,
key, sizeof (key) - 1),
local_dir, len_local_dir + 1)
- grptable) - 1;
}
return NSS_STATUS_SUCCESS;
}
static enum nss_status
internal_setgrent (ent_t *ent)
{
enum nss_status status = NSS_STATUS_SUCCESS;
ent->nis = ent->nis_first = 0;
if (_nss_first_init () != NSS_STATUS_SUCCESS)
return NSS_STATUS_UNAVAIL;
if (ent->oldkey != NULL)
{
free (ent->oldkey);
ent->oldkey = NULL;
ent->oldkeylen = 0;
}
if (ent->result != NULL)
{
nis_freeresult (ent->result);
ent->result = NULL;
}
if (ent->blacklist.data != NULL)
{
ent->blacklist.current = 1;
ent->blacklist.data[0] = '|';
ent->blacklist.data[1] = '\0';
}
else
ent->blacklist.current = 0;
if (ent->stream == NULL)
{
ent->stream = fopen ("/etc/group", "r");
if (ent->stream == NULL)
status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
else
{
/* We have to make sure the file is `closed on exec'. */
int result, flags;
result = flags = fcntl (fileno (ent->stream), F_GETFD, 0);
if (result >= 0)
{
flags |= FD_CLOEXEC;
result = fcntl (fileno (ent->stream), F_SETFD, flags);
}
if (result < 0)
{
/* Something went wrong. Close the stream and return a
failure. */
fclose (ent->stream);
ent->stream = NULL;
status = NSS_STATUS_UNAVAIL;
}
}
}
else
rewind (ent->stream);
return status;
}
enum nss_status
_nss_compat_setgrent (void)
{
enum nss_status result;
__libc_lock_lock (lock);
result = internal_setgrent (&ext_ent);
__libc_lock_unlock (lock);
return result;
}
static enum nss_status
internal_endgrent (ent_t *ent)
{
if (ent->stream != NULL)
{
fclose (ent->stream);
ent->stream = NULL;
}
ent->nis = ent->nis_first = 0;
if (ent->oldkey != NULL)
{
free (ent->oldkey);
ent->oldkey = NULL;
ent->oldkeylen = 0;
}
if (ent->result != NULL)
{
nis_freeresult (ent->result);
ent->result = NULL;
}
if (ent->blacklist.data != NULL)
{
ent->blacklist.current = 1;
ent->blacklist.data[0] = '|';
ent->blacklist.data[1] = '\0';
}
else
ent->blacklist.current = 0;
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_compat_endgrent (void)
{
enum nss_status result;
__libc_lock_lock (lock);
result = internal_endgrent (&ext_ent);
__libc_lock_unlock (lock);
return result;
}
static enum nss_status
getgrent_next_nis (struct group *result, ent_t *ent, char *buffer,
size_t buflen, int *errnop)
{
struct parser_data *data = (void *) buffer;
char *domain;
char *outkey, *outval;
int outkeylen, outvallen, parse_res;
char *p;
if (yp_get_default_domain (&domain) != YPERR_SUCCESS)
{
ent->nis = 0;
return NSS_STATUS_NOTFOUND;
}
do
{
char *save_oldkey;
int save_oldlen;
bool_t save_nis_first;
if (ent->nis_first)
{
if (yp_first (domain, "group.byname", &outkey, &outkeylen,
&outval, &outvallen) != YPERR_SUCCESS)
{
ent->nis = 0;
return NSS_STATUS_UNAVAIL;
}
save_oldkey = ent->oldkey;
save_oldlen = ent->oldkeylen;
save_nis_first = TRUE;
ent->oldkey = outkey;
ent->oldkeylen = outkeylen;
ent->nis_first = FALSE;
}
else
{
if (yp_next (domain, "group.byname", ent->oldkey, ent->oldkeylen,
&outkey, &outkeylen, &outval, &outvallen)
!= YPERR_SUCCESS)
{
ent->nis = 0;
return NSS_STATUS_NOTFOUND;
}
save_oldkey = ent->oldkey;
save_oldlen = ent->oldkeylen;
save_nis_first = FALSE;
ent->oldkey = outkey;
ent->oldkeylen = outkeylen;
}
/* Copy the found data to our buffer */
p = strncpy (buffer, outval, buflen);
/* ...and free the data. */
free (outval);
while (isspace (*p))
++p;
parse_res = _nss_files_parse_grent (p, result, data, buflen, errnop);
if (parse_res == -1)
{
free (ent->oldkey);
ent->oldkey = save_oldkey;
ent->oldkeylen = save_oldlen;
ent->nis_first = save_nis_first;
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
else
{
if (!save_nis_first)
free (save_oldkey);
}
if (parse_res &&
in_blacklist (result->gr_name, strlen (result->gr_name), ent))
parse_res = 0; /* if result->gr_name in blacklist,search next entry */
}
while (!parse_res);
return NSS_STATUS_SUCCESS;
}
static enum nss_status
getgrent_next_nisplus (struct group *result, ent_t *ent, char *buffer,
size_t buflen, int *errnop)
{
int parse_res;
do
{
nis_result *save_oldres;
bool_t save_nis_first;
if (ent->nis_first)
{
save_oldres = ent->result;
save_nis_first = TRUE;
ent->result = nis_first_entry(grptable);
if (niserr2nss (ent->result->status) != NSS_STATUS_SUCCESS)
{
ent->nis = 0;
return niserr2nss (ent->result->status);
}
ent->nis_first = FALSE;
}
else
{
nis_result *res;
save_oldres = ent->result;
save_nis_first = FALSE;
res = nis_next_entry(grptable, &ent->result->cookie);
ent->result = res;
if (niserr2nss (ent->result->status) != NSS_STATUS_SUCCESS)
{
ent->nis = 0;
return niserr2nss (ent->result->status);
}
}
parse_res = _nss_nisplus_parse_grent (ent->result, 0, result,
buffer, buflen, errnop);
if (parse_res == -1)
{
nis_freeresult (ent->result);
ent->result = save_oldres;
ent->nis_first = save_nis_first;
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
else
{
if (!save_nis_first)
nis_freeresult (save_oldres);
}
if (parse_res &&
in_blacklist (result->gr_name, strlen (result->gr_name), ent))
parse_res = 0; /* if result->gr_name in blacklist,search next entry */
}
while (!parse_res);
return NSS_STATUS_SUCCESS;
}
/* This function handle the +group entrys in /etc/group */
static enum nss_status
getgrnam_plusgroup (const char *name, struct group *result, char *buffer,
size_t buflen, int *errnop)
{
struct parser_data *data = (void *) buffer;
int parse_res;
if (use_nisplus) /* Do the NIS+ query here */
{
nis_result *res;
char buf[strlen (name) + 24 + grptablelen];
sprintf(buf, "[name=%s],%s", name, grptable);
res = nis_list(buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
if (niserr2nss (res->status) != NSS_STATUS_SUCCESS)
{
enum nss_status status = niserr2nss (res->status);
nis_freeresult (res);
return status;
}
parse_res = _nss_nisplus_parse_grent (res, 0, result, buffer, buflen,
errnop);
if (parse_res == -1)
{
nis_freeresult (res);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
nis_freeresult (res);
}
else /* Use NIS */
{
char *domain, *outval, *p;
int outvallen;
if (yp_get_default_domain (&domain) != YPERR_SUCCESS)
return NSS_STATUS_NOTFOUND;
if (yp_match (domain, "group.byname", name, strlen (name),
&outval, &outvallen) != YPERR_SUCCESS)
return NSS_STATUS_NOTFOUND;
p = strncpy (buffer, outval,
buflen < (size_t) outvallen ? buflen : (size_t) outvallen);
free (outval);
while (isspace (*p))
++p;
parse_res = _nss_files_parse_grent (p, result, data, buflen, errnop);
if (parse_res == -1)
return NSS_STATUS_TRYAGAIN;
}
if (parse_res)
/* We found the entry. */
return NSS_STATUS_SUCCESS;
else
return NSS_STATUS_RETURN;
}
static enum nss_status
getgrent_next_file (struct group *result, ent_t *ent,
char *buffer, size_t buflen, int *errnop)
{
struct parser_data *data = (void *) buffer;
while (1)
{
fpos_t pos;
int parse_res = 0;
char *p;
do
{
fgetpos (ent->stream, &pos);
p = fgets (buffer, buflen, ent->stream);
if (p == NULL)
{
if (feof (ent->stream))
return NSS_STATUS_NOTFOUND;
else
{
fsetpos (ent->stream, &pos);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
}
/* Terminate the line for any case. */
buffer[buflen - 1] = '\0';
/* Skip leading blanks. */
while (isspace (*p))
++p;
}
while (*p == '\0' || *p == '#' || /* Ignore empty and comment lines. */
/* Parse the line. If it is invalid, loop to
get the next line of the file to parse. */
!(parse_res = _nss_files_parse_grent (p, result, data, buflen,
errnop)));
if (parse_res == -1)
{
/* The parser ran out of space. */
fsetpos (ent->stream, &pos);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
if (result->gr_name[0] != '+' && result->gr_name[0] != '-')
/* This is a real entry. */
break;
/* -group */
if (result->gr_name[0] == '-' && result->gr_name[1] != '\0'
&& result->gr_name[1] != '@')
{
blacklist_store_name (&result->gr_name[1], ent);
continue;
}
/* +group */
if (result->gr_name[0] == '+' && result->gr_name[1] != '\0'
&& result->gr_name[1] != '@')
{
enum nss_status status;
/* Store the group in the blacklist for the "+" at the end of
/etc/group */
blacklist_store_name (&result->gr_name[1], ent);
status = getgrnam_plusgroup (&result->gr_name[1], result, buffer,
buflen, errnop);
if (status == NSS_STATUS_SUCCESS) /* We found the entry. */
break;
else
if (status == NSS_STATUS_RETURN /* We couldn't parse the entry */
|| status == NSS_STATUS_NOTFOUND) /* No group in NIS */
continue;
else
{
if (status == NSS_STATUS_TRYAGAIN)
{
/* The parser ran out of space. */
fsetpos (ent->stream, &pos);
*errnop = ERANGE;
}
return status;
}
}
/* +:... */
if (result->gr_name[0] == '+' && result->gr_name[1] == '\0')
{
ent->nis = TRUE;
ent->nis_first = TRUE;
if (use_nisplus)
return getgrent_next_nisplus (result, ent, buffer, buflen, errnop);
else
return getgrent_next_nis (result, ent, buffer, buflen, errnop);
}
}
return NSS_STATUS_SUCCESS;
}
static enum nss_status
internal_getgrent_r (struct group *gr, ent_t *ent, char *buffer,
size_t buflen, int *errnop)
{
if (ent->nis)
{
if (use_nisplus)
return getgrent_next_nisplus (gr, ent, buffer, buflen, errnop);
else
return getgrent_next_nis (gr, ent, buffer, buflen, errnop);
}
else
return getgrent_next_file (gr, ent, buffer, buflen, errnop);
}
enum nss_status
_nss_compat_getgrent_r (struct group *grp, char *buffer, size_t buflen,
int *errnop)
{
enum nss_status status = NSS_STATUS_SUCCESS;
__libc_lock_lock (lock);
/* Be prepared that the setgrent function was not called before. */
if (ext_ent.stream == NULL)
status = internal_setgrent (&ext_ent);
if (status == NSS_STATUS_SUCCESS)
status = internal_getgrent_r (grp, &ext_ent, buffer, buflen, errnop);
__libc_lock_unlock (lock);
return status;
}
/* Searches in /etc/group and the NIS/NIS+ map for a special group */
static enum nss_status
internal_getgrnam_r (const char *name, struct group *result, ent_t *ent,
char *buffer, size_t buflen, int *errnop)
{
struct parser_data *data = (void *) buffer;
while (1)
{
fpos_t pos;
int parse_res = 0;
char *p;
do
{
fgetpos (ent->stream, &pos);
p = fgets (buffer, buflen, ent->stream);
if (p == NULL)
{
if (feof (ent->stream))
return NSS_STATUS_NOTFOUND;
else
{
fsetpos (ent->stream, &pos);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
}
/* Terminate the line for any case. */
buffer[buflen - 1] = '\0';
/* Skip leading blanks. */
while (isspace (*p))
++p;
}
while (*p == '\0' || *p == '#' || /* Ignore empty and comment lines. */
/* Parse the line. If it is invalid, loop to
get the next line of the file to parse. */
!(parse_res = _nss_files_parse_grent (p, result, data, buflen,
errnop)));
if (parse_res == -1)
{
/* The parser ran out of space. */
fsetpos (ent->stream, &pos);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
/* This is a real entry. */
if (result->gr_name[0] != '+' && result->gr_name[0] != '-')
{
if (strcmp (result->gr_name, name) == 0)
return NSS_STATUS_SUCCESS;
else
continue;
}
/* -group */
if (result->gr_name[0] == '-' && result->gr_name[1] != '\0')
{
if (strcmp (&result->gr_name[1], name) == 0)
return NSS_STATUS_NOTFOUND;
else
continue;
}
/* +group */
if (result->gr_name[0] == '+' && result->gr_name[1] != '\0')
{
if (strcmp (name, &result->gr_name[1]) == 0)
{
enum nss_status status;
status = getgrnam_plusgroup (name, result, buffer, buflen,
errnop);
if (status == NSS_STATUS_RETURN)
/* We couldn't parse the entry */
continue;
else
return status;
}
}
/* +:... */
if (result->gr_name[0] == '+' && result->gr_name[1] == '\0')
{
enum nss_status status;
status = getgrnam_plusgroup (name, result, buffer, buflen, errnop);
if (status == NSS_STATUS_RETURN)
/* We couldn't parse the entry */
continue;
else
return status;
}
}
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_compat_getgrnam_r (const char *name, struct group *grp,
char *buffer, size_t buflen, int *errnop)
{
ent_t ent = {0, 0, NULL, 0, NULL, NULL, {NULL, 0, 0}};
enum nss_status status;
if (name[0] == '-' || name[0] == '+')
return NSS_STATUS_NOTFOUND;
__libc_lock_lock (lock);
status = internal_setgrent (&ent);
__libc_lock_unlock (lock);
if (status != NSS_STATUS_SUCCESS)
return status;
status = internal_getgrnam_r (name, grp, &ent, buffer, buflen, errnop);
internal_endgrent (&ent);
return status;
}
/* This function handle the + entry in /etc/group */
static enum nss_status
getgrgid_plusgroup (gid_t gid, struct group *result, char *buffer,
size_t buflen, int *errnop)
{
struct parser_data *data = (void *) buffer;
int parse_res;
if (use_nisplus) /* Do the NIS+ query here */
{
nis_result *res;
char buf[24 + grptablelen];
sprintf(buf, "[gid=%d],%s", gid, grptable);
res = nis_list(buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
if (niserr2nss (res->status) != NSS_STATUS_SUCCESS)
{
enum nss_status status = niserr2nss (res->status);
nis_freeresult (res);
return status;
}
if ((parse_res = _nss_nisplus_parse_grent (res, 0, result, buffer,
buflen, errnop)) == -1)
{
nis_freeresult (res);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
nis_freeresult (res);
}
else /* Use NIS */
{
char buf[24];
char *domain, *outval, *p;
int outvallen;
if (yp_get_default_domain (&domain) != YPERR_SUCCESS)
{
*errnop = errno;
return NSS_STATUS_TRYAGAIN;
}
snprintf (buf, sizeof (buf), "%d", gid);
if (yp_match (domain, "group.bygid", buf, strlen (buf),
&outval, &outvallen) != YPERR_SUCCESS)
{
*errnop = errno;
return NSS_STATUS_TRYAGAIN;
}
p = strncpy (buffer, outval,
buflen < (size_t) outvallen ? buflen : (size_t) outvallen);
free (outval);
while (isspace (*p))
p++;
parse_res = _nss_files_parse_grent (p, result, data, buflen, errnop);
if (parse_res == -1)
return NSS_STATUS_TRYAGAIN;
}
if (parse_res)
/* We found the entry. */
return NSS_STATUS_SUCCESS;
else
return NSS_STATUS_RETURN;
}
/* Searches in /etc/group and the NIS/NIS+ map for a special group id */
static enum nss_status
internal_getgrgid_r (gid_t gid, struct group *result, ent_t *ent,
char *buffer, size_t buflen, int *errnop)
{
struct parser_data *data = (void *) buffer;
while (1)
{
fpos_t pos;
int parse_res = 0;
char *p;
do
{
fgetpos (ent->stream, &pos);
p = fgets (buffer, buflen, ent->stream);
if (p == NULL)
{
if (feof (ent->stream))
return NSS_STATUS_NOTFOUND;
else
{
fsetpos (ent->stream, &pos);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
}
/* Terminate the line for any case. */
buffer[buflen - 1] = '\0';
/* Skip leading blanks. */
while (isspace (*p))
++p;
}
while (*p == '\0' || *p == '#' || /* Ignore empty and comment lines. */
/* Parse the line. If it is invalid, loop to
get the next line of the file to parse. */
!(parse_res = _nss_files_parse_grent (p, result, data, buflen,
errnop)));
if (parse_res == -1)
{
/* The parser ran out of space. */
fsetpos (ent->stream, &pos);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
/* This is a real entry. */
if (result->gr_name[0] != '+' && result->gr_name[0] != '-')
{
if (result->gr_gid == gid)
return NSS_STATUS_SUCCESS;
else
continue;
}
/* -group */
if (result->gr_name[0] == '-' && result->gr_name[1] != '\0')
{
blacklist_store_name (&result->gr_name[1], ent);
continue;
}
/* +group */
if (result->gr_name[0] == '+' && result->gr_name[1] != '\0')
{
enum nss_status status;
/* Store the group in the blacklist for the "+" at the end of
/etc/group */
blacklist_store_name (&result->gr_name[1], ent);
status = getgrnam_plusgroup (&result->gr_name[1], result, buffer,
buflen, errnop);
if (status == NSS_STATUS_SUCCESS && result->gr_gid == gid)
break;
else
continue;
}
/* +:... */
if (result->gr_name[0] == '+' && result->gr_name[1] == '\0')
{
enum nss_status status;
status = getgrgid_plusgroup (gid, result, buffer, buflen, errnop);
if (status == NSS_STATUS_RETURN) /* We couldn't parse the entry */
return NSS_STATUS_NOTFOUND;
else
return status;
}
}
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_compat_getgrgid_r (gid_t gid, struct group *grp,
char *buffer, size_t buflen, int *errnop)
{
ent_t ent = {0, 0, NULL, 0, NULL, NULL, {NULL, 0, 0}};
enum nss_status status;
__libc_lock_lock (lock);
status = internal_setgrent (&ent);
__libc_lock_unlock (lock);
if (status != NSS_STATUS_SUCCESS)
return status;
status = internal_getgrgid_r (gid, grp, &ent, buffer, buflen, errnop);
internal_endgrent (&ent);
return status;
}
/* Support routines for remembering -@netgroup and -user entries.
The names are stored in a single string with `|' as separator. */
static void
blacklist_store_name (const char *name, ent_t *ent)
{
int namelen = strlen (name);
char *tmp;
/* first call, setup cache */
if (ent->blacklist.size == 0)
{
ent->blacklist.size = MAX (BLACKLIST_INITIAL_SIZE, 2 * namelen);
ent->blacklist.data = malloc (ent->blacklist.size);
if (ent->blacklist.data == NULL)
return;
ent->blacklist.data[0] = '|';
ent->blacklist.data[1] = '\0';
ent->blacklist.current = 1;
}
else
{
if (in_blacklist (name, namelen, ent))
return; /* no duplicates */
if (ent->blacklist.current + namelen + 1 >= ent->blacklist.size)
{
ent->blacklist.size += MAX (BLACKLIST_INCREMENT, 2 * namelen);
tmp = realloc (ent->blacklist.data, ent->blacklist.size);
if (tmp == NULL)
{
free (ent->blacklist.data);
ent->blacklist.size = 0;
return;
}
ent->blacklist.data = tmp;
}
}
tmp = stpcpy (ent->blacklist.data + ent->blacklist.current, name);
*tmp++ = '|';
*tmp = '\0';
ent->blacklist.current += namelen + 1;
return;
}
/* returns TRUE if ent->blacklist contains name, else FALSE */
static bool_t
in_blacklist (const char *name, int namelen, ent_t *ent)
{
char buf[namelen + 3];
char *cp;
if (ent->blacklist.data == NULL)
return FALSE;
buf[0] = '|';
cp = stpcpy (&buf[1], name);
*cp++= '|';
*cp = '\0';
return strstr (ent->blacklist.data, buf) != NULL;
}
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