glibc/nis/nss_nisplus/nisplus-network.c

467 lines
11 KiB
C

/* Copyright (C) 1997,1998,2000,2001,2002,2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@vt.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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <nss.h>
#include <netdb.h>
#include <errno.h>
#include <ctype.h>
#include <stdint.h>
#include <string.h>
#include <arpa/inet.h>
#include <bits/libc-lock.h>
#include <rpcsvc/nis.h>
#include "nss-nisplus.h"
__libc_lock_define_initialized (static, lock)
static nis_result *result;
static nis_name tablename_val;
static u_long tablename_len;
#define NISENTRYVAL(idx,col,res) \
((res)->objects.objects_val[(idx)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_val)
#define NISENTRYLEN(idx,col,res) \
((res)->objects.objects_val[(idx)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_len)
static int
_nss_nisplus_parse_netent (nis_result *result, struct netent *network,
char *buffer, size_t buflen, int *errnop)
{
char *first_unused = buffer;
size_t room_left = buflen;
unsigned int i;
char *p, *line;
if (result == NULL)
return 0;
if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
|| __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
|| strcmp (result->objects.objects_val[0].EN_data.en_type,
"networks_tbl") != 0
|| result->objects.objects_val[0].EN_data.en_cols.en_cols_len < 3)
return 0;
if (NISENTRYLEN(0, 0, result) >= room_left)
{
/* The line is too long for our buffer. */
no_more_room:
*errnop = ERANGE;
return -1;
}
strncpy (first_unused, NISENTRYVAL(0, 0, result),
NISENTRYLEN (0, 0, result));
first_unused[NISENTRYLEN (0, 0, result)] = '\0';
network->n_name = first_unused;
room_left -= (strlen (first_unused) +1);
first_unused += strlen (first_unused) +1;
network->n_addrtype = 0;
network->n_net = inet_network (NISENTRYVAL (0, 2, result));
p = first_unused;
line = p;
for (i = 0; i < result->objects.objects_len; ++i)
{
if (strcmp (NISENTRYVAL (i, 1, result), network->n_name) != 0)
{
if (NISENTRYLEN (i, 1, result) + 2 > room_left)
goto no_more_room;
*p++ = ' ';
p = __stpncpy (p, NISENTRYVAL (i, 1, result),
NISENTRYLEN (i, 1, result));
*p = '\0';
room_left -= (NISENTRYLEN (i, 1, result) + 1);
}
}
*p++ = '\0';
first_unused = p;
/* Adjust the pointer so it is aligned for
storing pointers. */
first_unused += __alignof__ (char *) - 1;
first_unused -= ((first_unused - (char *) 0) % __alignof__ (char *));
network->n_aliases = (char **) first_unused;
if (room_left < 2 * sizeof (char *))
goto no_more_room;
room_left -= (2 * sizeof (char *));
network->n_aliases[0] = NULL;
i = 0;
while (*line != '\0')
{
/* Skip leading blanks. */
while (isspace (*line))
line++;
if (*line == '\0')
break;
if (room_left < sizeof (char *))
goto no_more_room;
room_left -= sizeof (char *);
network->n_aliases[i] = line;
while (*line != '\0' && *line != ' ')
++line;
if (*line == ' ')
{
*line = '\0';
++line;
++i;
}
else
network->n_aliases[i+1] = NULL;
}
return 1;
}
static enum nss_status
_nss_create_tablename (int *errnop)
{
if (tablename_val == NULL)
{
char buf [40 + strlen (nis_local_directory ())];
char *p;
p = __stpcpy (buf, "networks.org_dir.");
p = __stpcpy (p, nis_local_directory ());
tablename_val = __strdup (buf);
if (tablename_val == NULL)
{
*errnop = errno;
return NSS_STATUS_TRYAGAIN;
}
tablename_len = strlen (tablename_val);
}
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_nisplus_setnetent (int stayopen)
{
enum nss_status status = NSS_STATUS_SUCCESS;
int err;
__libc_lock_lock (lock);
if (result)
nis_freeresult (result);
result = NULL;
if (tablename_val == NULL)
status = _nss_create_tablename (&err);
__libc_lock_unlock (lock);
return status;
}
enum nss_status
_nss_nisplus_endnetent (void)
{
__libc_lock_lock (lock);
if (result)
nis_freeresult (result);
result = NULL;
__libc_lock_unlock (lock);
return NSS_STATUS_SUCCESS;
}
static enum nss_status
internal_nisplus_getnetent_r (struct netent *network, char *buffer,
size_t buflen, int *errnop, int *herrnop)
{
int parse_res;
/* Get the next entry until we found a correct one. */
do
{
nis_result *saved_res;
if (result == NULL)
{
saved_res = NULL;
if (tablename_val == NULL)
{
enum nss_status status = _nss_create_tablename (errnop);
if (status != NSS_STATUS_SUCCESS)
return status;
}
result = nis_first_entry (tablename_val);
if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
{
int retval;
retval = niserr2nss (result->status);
nis_freeresult (result);
result = NULL;
if (retval == NSS_STATUS_TRYAGAIN)
{
*herrnop = NETDB_INTERNAL;
*errnop = errno;
return retval;
}
else
return retval;
}
}
else
{
nis_result *res;
res = nis_next_entry (tablename_val, &result->cookie);
saved_res = result;
result = res;
if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
{
int retval;
retval = niserr2nss (result->status);
nis_freeresult (result);
result = saved_res;
if (retval == NSS_STATUS_TRYAGAIN)
{
*herrnop = NETDB_INTERNAL;
*errnop = errno;
}
return retval;
}
}
parse_res = _nss_nisplus_parse_netent (result, network, buffer,
buflen, errnop);
if (parse_res == -1)
{
*herrnop = NETDB_INTERNAL;
return NSS_STATUS_TRYAGAIN;
}
} while (!parse_res);
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_nisplus_getnetent_r (struct netent *result, char *buffer,
size_t buflen, int *errnop, int *herrnop)
{
int status;
__libc_lock_lock (lock);
status = internal_nisplus_getnetent_r (result, buffer, buflen, errnop,
herrnop);
__libc_lock_unlock (lock);
return status;
}
enum nss_status
_nss_nisplus_getnetbyname_r (const char *name, struct netent *network,
char *buffer, size_t buflen, int *errnop,
int *herrnop)
{
int parse_res, retval;
if (tablename_val == NULL)
{
enum nss_status status = _nss_create_tablename (errnop);
if (status != NSS_STATUS_SUCCESS)
return status;
}
if (name == NULL)
{
*errnop = EINVAL;
*herrnop = NETDB_INTERNAL;
return NSS_STATUS_UNAVAIL;
}
else
{
nis_result *result;
char buf[strlen (name) + 255 + tablename_len];
int olderr = errno;
/* Search at first in the alias list, and use the correct name
for the next search */
sprintf (buf, "[name=%s],%s", name, tablename_val);
result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
if (result != NULL)
{
/* If we do not find it, try it as original name. But if the
database is correct, we should find it in the first case, too */
if ((result->status != NIS_SUCCESS
&& result->status != NIS_S_SUCCESS)
|| __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
|| strcmp (result->objects.objects_val[0].EN_data.en_type,
"networks_tbl") != 0
|| (result->objects.objects_val[0].EN_data.en_cols.en_cols_len
< 3))
sprintf (buf, "[cname=%s],%s", name, tablename_val);
else
sprintf (buf, "[cname=%s],%s", NISENTRYVAL (0, 0, result),
tablename_val);
nis_freeresult (result);
result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
}
if (result == NULL)
{
__set_errno (ENOMEM);
return NSS_STATUS_TRYAGAIN;
}
retval = niserr2nss (result->status);
if (retval != NSS_STATUS_SUCCESS)
{
if (retval == NSS_STATUS_TRYAGAIN)
{
*errnop = errno;
*herrnop = NETDB_INTERNAL;
}
else
__set_errno (olderr);
nis_freeresult (result);
return retval;
}
parse_res = _nss_nisplus_parse_netent (result, network, buffer, buflen,
errnop);
nis_freeresult (result);
if (parse_res > 0)
return NSS_STATUS_SUCCESS;
*herrnop = NETDB_INTERNAL;
if (parse_res == -1)
{
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
else
{
__set_errno (olderr);
return NSS_STATUS_NOTFOUND;
}
}
}
/* XXX type is ignored, SUN's NIS+ table doesn't support it */
enum nss_status
_nss_nisplus_getnetbyaddr_r (uint32_t addr, const int type,
struct netent *network, char *buffer,
size_t buflen, int *errnop, int *herrnop)
{
if (tablename_val == NULL)
{
enum nss_status status = _nss_create_tablename (errnop);
if (status != NSS_STATUS_SUCCESS)
return status;
}
{
int parse_res, retval;
nis_result *result;
char buf[1024 + tablename_len];
struct in_addr in;
char buf2[256];
int b2len;
int olderr = errno;
in = inet_makeaddr (addr, 0);
strcpy (buf2, inet_ntoa (in));
b2len = strlen (buf2);
while (1)
{
sprintf (buf, "[addr=%s],%s", buf2, tablename_val);
result = nis_list (buf, EXPAND_NAME, NULL, NULL);
if (result == NULL)
{
__set_errno (ENOMEM);
return NSS_STATUS_TRYAGAIN;
}
retval = niserr2nss (result->status);
if (retval != NSS_STATUS_SUCCESS)
{
if (buf2[b2len -2] == '.' && buf2[b2len -1] == '0')
{
/* Try again, but with trailing dot(s)
removed (one by one) */
buf2[b2len - 2] = '\0';
b2len -= 2;
continue;
}
else
return NSS_STATUS_NOTFOUND;
if (retval == NSS_STATUS_TRYAGAIN)
{
*errnop = errno;
*herrnop = NETDB_INTERNAL;
}
else
__set_errno (olderr);
nis_freeresult (result);
return retval;
}
parse_res = _nss_nisplus_parse_netent (result, network, buffer,
buflen, errnop);
nis_freeresult (result);
if (parse_res > 0)
return NSS_STATUS_SUCCESS;
*herrnop = NETDB_INTERNAL;
if (parse_res == -1)
{
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
else
{
__set_errno (olderr);
return NSS_STATUS_NOTFOUND;
}
}
}
}