glibc/nis/nss_nis/nis-network.c

316 lines
7.3 KiB
C

/* Copyright (C) 1996-2016 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 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, see
<http://www.gnu.org/licenses/>. */
#include <nss.h>
/* The following is an ugly trick to avoid a prototype declaration for
_nss_nis_endgrent. */
#define _nss_nis_endnetent _nss_nis_endnetent_XXX
#include <netdb.h>
#undef _nss_nis_endnetent
#include <ctype.h>
#include <errno.h>
#include <stdint.h>
#include <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <libc-lock.h>
#include <rpcsvc/yp.h>
#include <rpcsvc/ypclnt.h>
#include "nss-nis.h"
/* Get the declaration of the parser function. */
#define ENTNAME netent
#define EXTERN_PARSER
#include <nss/nss_files/files-parse.c>
__libc_lock_define_initialized (static, lock)
static bool_t new_start = 1;
static char *oldkey;
static int oldkeylen;
enum nss_status
_nss_nis_setnetent (int stayopen)
{
__libc_lock_lock (lock);
new_start = 1;
if (oldkey != NULL)
{
free (oldkey);
oldkey = NULL;
oldkeylen = 0;
}
__libc_lock_unlock (lock);
return NSS_STATUS_SUCCESS;
}
/* Make _nss_nis_endnetent an alias of _nss_nis_setnetent. We do this
even though the prototypes don't match. The argument of setnetent
is not used so this makes no difference. */
strong_alias (_nss_nis_setnetent, _nss_nis_endnetent)
static enum nss_status
internal_nis_getnetent_r (struct netent *net, char *buffer, size_t buflen,
int *errnop, int *herrnop)
{
struct parser_data *data = (void *) buffer;
char *domain;
if (__glibc_unlikely (yp_get_default_domain (&domain)))
return NSS_STATUS_UNAVAIL;
/* Get the next entry until we found a correct one. */
int parse_res;
do
{
char *result;
char *outkey;
int len;
int keylen;
int yperr;
if (new_start)
yperr = yp_first (domain, "networks.byname", &outkey, &keylen, &result,
&len);
else
yperr = yp_next (domain, "networks.byname", oldkey, oldkeylen, &outkey,
&keylen, &result, &len);
if (__glibc_unlikely (yperr != YPERR_SUCCESS))
{
enum nss_status retval = yperr2nss (yperr);
if (retval == NSS_STATUS_TRYAGAIN)
{
*herrnop = NETDB_INTERNAL;
*errnop = errno;
}
return retval;
}
if (__glibc_unlikely ((size_t) (len + 1) > buflen))
{
free (result);
*errnop = ERANGE;
*herrnop = NETDB_INTERNAL;
return NSS_STATUS_TRYAGAIN;
}
char *p = strncpy (buffer, result, len);
buffer[len] = '\0';
while (isspace (*p))
++p;
free (result);
parse_res = _nss_files_parse_netent (p, net, data, buflen, errnop);
if (__glibc_unlikely (parse_res == -1))
{
free (outkey);
*herrnop = NETDB_INTERNAL;
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
free (oldkey);
oldkey = outkey;
oldkeylen = keylen;
new_start = 0;
}
while (!parse_res);
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_nis_getnetent_r (struct netent *net, char *buffer, size_t buflen,
int *errnop, int *herrnop)
{
enum nss_status status;
__libc_lock_lock (lock);
status = internal_nis_getnetent_r (net, buffer, buflen, errnop, herrnop);
__libc_lock_unlock (lock);
return status;
}
enum nss_status
_nss_nis_getnetbyname_r (const char *name, struct netent *net, char *buffer,
size_t buflen, int *errnop, int *herrnop)
{
if (name == NULL)
{
*errnop = EINVAL;
*herrnop = NETDB_INTERNAL;
return NSS_STATUS_UNAVAIL;
}
char *domain;
if (__glibc_unlikely (yp_get_default_domain (&domain)))
return NSS_STATUS_UNAVAIL;
struct parser_data *data = (void *) buffer;
if (buflen < sizeof *data + 1)
{
*herrnop = NETDB_INTERNAL;
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
/* Convert name to lowercase. */
size_t namlen = strlen (name);
/* Limit name length to the maximum size of an RPC packet. */
if (namlen > UDPMSGSIZE)
{
*errnop = ERANGE;
return NSS_STATUS_UNAVAIL;
}
char name2[namlen + 1];
size_t i;
for (i = 0; i < namlen; ++i)
name2[i] = _tolower (name[i]);
name2[i] = '\0';
char *result;
int len;
int yperr = yp_match (domain, "networks.byname", name2, namlen, &result,
&len);
if (__glibc_unlikely (yperr != YPERR_SUCCESS))
{
enum nss_status retval = yperr2nss (yperr);
if (retval == NSS_STATUS_TRYAGAIN)
{
*errnop = errno;
*herrnop = NETDB_INTERNAL;
}
return retval;
}
if (__glibc_unlikely ((size_t) (len + 1) > buflen))
{
free (result);
*errnop = ERANGE;
*herrnop = NETDB_INTERNAL;
return NSS_STATUS_TRYAGAIN;
}
char *p = strncpy (buffer, result, len);
buffer[len] = '\0';
while (isspace (*p))
++p;
free (result);
int parse_res = _nss_files_parse_netent (p, net, data, buflen, errnop);
if (__glibc_unlikely (parse_res < 1))
{
*herrnop = NETDB_INTERNAL;
if (parse_res == -1)
return NSS_STATUS_TRYAGAIN;
else
return NSS_STATUS_NOTFOUND;
}
else
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_nis_getnetbyaddr_r (uint32_t addr, int type, struct netent *net,
char *buffer, size_t buflen, int *errnop,
int *herrnop)
{
char *domain;
if (__glibc_unlikely (yp_get_default_domain (&domain)))
return NSS_STATUS_UNAVAIL;
struct in_addr in = { .s_addr = htonl (addr) };
char *buf = inet_ntoa (in);
size_t blen = strlen (buf);
while (1)
{
char *result;
int len;
int yperr = yp_match (domain, "networks.byaddr", buf, blen, &result,
&len);
if (__glibc_unlikely (yperr != YPERR_SUCCESS))
{
enum nss_status retval = yperr2nss (yperr);
if (retval == NSS_STATUS_NOTFOUND)
{
if (buf[blen - 2] == '.' && buf[blen - 1] == '0')
{
/* Try again, but with trailing dot(s)
removed (one by one) */
buf[blen - 2] = '\0';
blen -= 2;
continue;
}
else
return NSS_STATUS_NOTFOUND;
}
else
{
if (retval == NSS_STATUS_TRYAGAIN)
*errnop = errno;
return retval;
}
}
if (__glibc_unlikely ((size_t) (len + 1) > buflen))
{
free (result);
*errnop = ERANGE;
*herrnop = NETDB_INTERNAL;
return NSS_STATUS_TRYAGAIN;
}
char *p = strncpy (buffer, result, len);
buffer[len] = '\0';
while (isspace (*p))
++p;
free (result);
int parse_res = _nss_files_parse_netent (p, net, (void *) buffer,
buflen, errnop);
if (__glibc_unlikely (parse_res < 1))
{
*herrnop = NETDB_INTERNAL;
if (parse_res == -1)
return NSS_STATUS_TRYAGAIN;
else
return NSS_STATUS_NOTFOUND;
}
else
return NSS_STATUS_SUCCESS;
}
}