glibc/nis/nss_nis/nis-hosts.c

447 lines
10 KiB
C

/* Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@suse.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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <nss.h>
#include <ctype.h>
#include <netdb.h>
#include <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <resolv.h>
#include <bits/libc-lock.h>
#include <rpcsvc/yp.h>
#include <rpcsvc/ypclnt.h>
#include "nss-nis.h"
/* Get implementation for some internal functions. */
#include <resolv/mapv4v6addr.h>
#define ENTNAME hostent
#define DATABASE "hosts"
#define NEED_H_ERRNO
#define EXTRA_ARGS , af, flags
#define EXTRA_ARGS_DECL , int af, int flags
#define ENTDATA hostent_data
struct hostent_data
{
unsigned char host_addr[16]; /* IPv4 or IPv6 address. */
char *h_addr_ptrs[2]; /* Points to that and null terminator. */
};
#define TRAILING_LIST_MEMBER h_aliases
#define TRAILING_LIST_SEPARATOR_P isspace
#include <nss/nss_files/files-parse.c>
LINE_PARSER
("#",
{
char *addr;
STRING_FIELD (addr, isspace, 1);
/* Parse address. */
if (af == AF_INET && inet_pton (AF_INET, addr, entdata->host_addr) > 0)
{
if (flags & AI_V4MAPPED)
{
map_v4v6_address ((char *) entdata->host_addr,
(char *) entdata->host_addr);
result->h_addrtype = AF_INET6;
result->h_length = IN6ADDRSZ;
}
else
{
result->h_addrtype = AF_INET;
result->h_length = INADDRSZ;
}
}
else if (af == AF_INET6
&& inet_pton (AF_INET6, addr, entdata->host_addr) > 0)
{
result->h_addrtype = AF_INET6;
result->h_length = IN6ADDRSZ;
}
else
/* Illegal address: ignore line. */
return 0;
/* Store a pointer to the address in the expected form. */
entdata->h_addr_ptrs[0] = entdata->host_addr;
entdata->h_addr_ptrs[1] = NULL;
result->h_addr_list = entdata->h_addr_ptrs;
STRING_FIELD (result->h_name, isspace, 1);
})
__libc_lock_define_initialized (static, lock)
static bool_t new_start = 1;
static char *oldkey = NULL;
static int oldkeylen = 0;
enum nss_status
_nss_nis_sethostent (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;
}
enum nss_status
_nss_nis_endhostent (void)
{
__libc_lock_lock (lock);
new_start = 1;
if (oldkey != NULL)
{
free (oldkey);
oldkey = NULL;
oldkeylen = 0;
}
__libc_lock_unlock (lock);
return NSS_STATUS_SUCCESS;
}
/* The calling function always need to get a lock first. */
static enum nss_status
internal_nis_gethostent_r (struct hostent *host, char *buffer,
size_t buflen, int *errnop, int *h_errnop,
int af, int flags)
{
char *domain;
char *result;
int len, parse_res;
char *outkey;
int keylen;
struct parser_data *data = (void *) buffer;
size_t linebuflen = buffer + buflen - data->linebuffer;
if (yp_get_default_domain (&domain))
return NSS_STATUS_UNAVAIL;
if (buflen < sizeof *data + 1)
{
*errnop = ERANGE;
*h_errnop = NETDB_INTERNAL;
return NSS_STATUS_TRYAGAIN;
}
/* Get the next entry until we found a correct one. */
do
{
enum nss_status retval;
char *p;
if (new_start)
retval = yperr2nss (yp_first (domain, "hosts.byname",
&outkey, &keylen, &result, &len));
else
retval = yperr2nss ( yp_next (domain, "hosts.byname",
oldkey, oldkeylen,
&outkey, &keylen, &result, &len));
if (retval != NSS_STATUS_SUCCESS)
{
switch (retval)
{
case NSS_STATUS_TRYAGAIN:
*errnop = errno;
*h_errnop = TRY_AGAIN;
break;
case NSS_STATUS_NOTFOUND:
*errnop = ENOENT;
*h_errnop = HOST_NOT_FOUND;
break;
default:
*h_errnop = NO_RECOVERY;
break;
}
return retval;
}
if ((size_t) (len + 1) > linebuflen)
{
free (result);
*h_errnop = NETDB_INTERNAL;
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
p = strncpy (data->linebuffer, result, len);
data->linebuffer[len] = '\0';
while (isspace (*p))
++p;
free (result);
parse_res = parse_line (p, host, data, buflen, errnop, af, flags);
if (parse_res == -1)
{
free (outkey);
*h_errnop = NETDB_INTERNAL;
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
free (oldkey);
oldkey = outkey;
oldkeylen = keylen;
new_start = 0;
}
while (!parse_res);
*h_errnop = NETDB_SUCCESS;
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_nis_gethostent_r (struct hostent *host, char *buffer, size_t buflen,
int *errnop, int *h_errnop)
{
enum nss_status status;
__libc_lock_lock (lock);
status = internal_nis_gethostent_r (host, buffer, buflen, errnop, h_errnop,
((_res.options & RES_USE_INET6) ? AF_INET6 : AF_INET),
((_res.options & RES_USE_INET6) ? AI_V4MAPPED : 0 ));
__libc_lock_unlock (lock);
return status;
}
static enum nss_status
internal_gethostbyname2_r (const char *name, int af, struct hostent *host,
char *buffer, size_t buflen, int *errnop,
int *h_errnop, int flags)
{
enum nss_status retval;
char *domain, *result, *p;
int len, parse_res;
struct parser_data *data = (void *) buffer;
size_t linebuflen = buffer + buflen - data->linebuffer;
if (name == NULL)
{
*errnop = EINVAL;
return NSS_STATUS_UNAVAIL;
}
if (yp_get_default_domain (&domain))
return NSS_STATUS_UNAVAIL;
if (buflen < sizeof *data + 1)
{
*h_errnop = NETDB_INTERNAL;
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
else
{
/* Convert name to lowercase. */
size_t namlen = strlen (name);
char name2[namlen + 1];
int i;
for (i = 0; i < namlen; ++i)
name2[i] = tolower (name[i]);
name2[i] = '\0';
retval = yperr2nss (yp_match (domain, "hosts.byname", name2,
namlen, &result, &len));
}
if (retval != NSS_STATUS_SUCCESS)
{
if (retval == NSS_STATUS_TRYAGAIN)
{
*h_errnop = TRY_AGAIN;
*errnop = errno;
}
if (retval == NSS_STATUS_NOTFOUND)
*h_errnop = HOST_NOT_FOUND;
return retval;
}
if ((size_t) (len + 1) > linebuflen)
{
free (result);
*h_errnop = NETDB_INTERNAL;
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
p = strncpy (data->linebuffer, result, len);
data->linebuffer[len] = '\0';
while (isspace (*p))
++p;
free (result);
parse_res = parse_line (p, host, data, buflen, errnop, af, flags);
if (parse_res < 1 || host->h_addrtype != af)
{
if (parse_res == -1)
{
*h_errnop = NETDB_INTERNAL;
return NSS_STATUS_TRYAGAIN;
}
else
{
*h_errnop = HOST_NOT_FOUND;
*errnop = ENOENT;
return NSS_STATUS_NOTFOUND;
}
}
*h_errnop = NETDB_SUCCESS;
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_nis_gethostbyname2_r (const char *name, int af, struct hostent *host,
char *buffer, size_t buflen, int *errnop,
int *h_errnop)
{
return internal_gethostbyname2_r (name, af, host, buffer, buflen, errnop,
h_errnop,
((_res.options & RES_USE_INET6) ? AI_V4MAPPED : 0));
}
enum nss_status
_nss_nis_gethostbyname_r (const char *name, struct hostent *host, char *buffer,
size_t buflen, int *errnop, int *h_errnop)
{
if (_res.options & RES_USE_INET6)
{
enum nss_status status;
status = internal_gethostbyname2_r (name, AF_INET6, host, buffer, buflen,
errnop, h_errnop, AI_V4MAPPED);
if (status == NSS_STATUS_SUCCESS)
return status;
}
return internal_gethostbyname2_r (name, AF_INET, host, buffer, buflen,
errnop, h_errnop, 0);
}
enum nss_status
_nss_nis_gethostbyaddr_r (const void *addr, socklen_t addrlen, int af,
struct hostent *host, char *buffer, size_t buflen,
int *errnop, int *h_errnop)
{
enum nss_status retval;
char *domain, *result, *p;
int len, parse_res;
char *buf;
struct parser_data *data = (void *) buffer;
size_t linebuflen = buffer + buflen - data->linebuffer;
if (yp_get_default_domain (&domain))
return NSS_STATUS_UNAVAIL;
if (buflen < sizeof *data + 1)
{
*errnop = ERANGE;
*h_errnop = NETDB_INTERNAL;
return NSS_STATUS_TRYAGAIN;
}
buf = inet_ntoa (*(const struct in_addr *) addr);
retval = yperr2nss (yp_match (domain, "hosts.byaddr", buf,
strlen (buf), &result, &len));
if (retval != NSS_STATUS_SUCCESS)
{
if (retval == NSS_STATUS_TRYAGAIN)
{
*h_errnop = TRY_AGAIN;
*errnop = errno;
}
if (retval == NSS_STATUS_NOTFOUND)
{
*h_errnop = HOST_NOT_FOUND;
*errnop = ENOENT;
}
return retval;
}
if ((size_t) (len + 1) > linebuflen)
{
free (result);
*errnop = ERANGE;
*h_errnop = NETDB_INTERNAL;
return NSS_STATUS_TRYAGAIN;
}
p = strncpy (data->linebuffer, result, len);
data->linebuffer[len] = '\0';
while (isspace (*p))
++p;
free (result);
parse_res = parse_line (p, host, data, buflen, errnop, af,
((_res.options & RES_USE_INET6) ? AI_V4MAPPED : 0));
if (parse_res < 1)
{
if (parse_res == -1)
{
*h_errnop = NETDB_INTERNAL;
return NSS_STATUS_TRYAGAIN;
}
else
{
*h_errnop = HOST_NOT_FOUND;
return NSS_STATUS_NOTFOUND;
}
}
*h_errnop = NETDB_SUCCESS;
return NSS_STATUS_SUCCESS;
}
#if 0
enum nss_status
_nss_nis_getipnodebyname_r (const char *name, int af, int flags,
struct hostent *result, char *buffer,
size_t buflen, int *errnop, int *herrnop)
{
return internal_gethostbyname2_r (name, af, result, buffer, buflen,
errnop, herrnop, flags);
}
#endif