/*
Unix SMB/CIFS implementation.
a WINS nsswitch module
Copyright (C) Andrew Tridgell 1999
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "nsswitch/winbind_client.h"
#include "nsswitch/libwbclient/wbclient.h"
#include "lib/util/string_wrappers.h"
#ifdef HAVE_NS_API_H
#include <ns_daemon.h>
#endif
#ifdef HAVE_PTHREAD_H
#include <pthread.h>
#endif
#ifdef HAVE_PTHREAD
static pthread_mutex_t wins_nss_mutex = PTHREAD_MUTEX_INITIALIZER;
#endif
#ifndef INADDRSZ
#define INADDRSZ 4
#endif
#ifndef NETDB_INTERNAL
#define NETDB_INTERNAL -1
#endif
#ifndef NETDB_SUCCESS
#define NETDB_SUCCESS 0
#endif
_PUBLIC_ON_LINUX_
NSS_STATUS _nss_wins_gethostbyname_r(const char *hostname,
struct hostent *he,
char *buffer,
size_t buflen,
int *errnop,
int *h_errnop);
NSS_STATUS _nss_wins_gethostbyname2_r(const char *name,
int af,
struct hostent *he,
char *buffer,
size_t buflen,
int *errnop,
int *h_errnop);
static char *lookup_byname_backend(const char *name)
{
const char *p;
char *ip, *ipp;
size_t nbt_len;
wbcErr result;
nbt_len = strlen(name);
if (nbt_len > MAX_NETBIOSNAME_LEN - 1) {
return NULL;
}
p = strchr(name, '.');
if (p != NULL) {
return NULL;
}
wbcSetClientProcessName("nss_wins");
result = wbcResolveWinsByName(name, &ip);
if (result != WBC_ERR_SUCCESS) {
return NULL;
}
ipp = strchr(ip, '\t');
if (ipp != NULL) {
*ipp = '\0';
}
return ip;
}
#ifdef HAVE_NS_API_H
static char *lookup_byaddr_backend(const char *ip)
{
wbcErr result;
char *name = NULL;
wbcSetClientProcessName("nss_wins");
result = wbcResolveWinsByIP(ip, &name);
if (result != WBC_ERR_SUCCESS) {
return NULL;
}
return name;
}
/* IRIX version */
int init(void)
{
bool ok;
nsd_logprintf(NSD_LOG_MIN, "entering init (wins)\n");
ok = nss_wins_init();
if (!ok) {
return NSD_ERROR;
}
return NSD_OK;
}
int lookup(nsd_file_t *rq)
{
char *map;
char *key;
char *addr;
int i, count, len, size;
char response[1024];
bool found = False;
nsd_logprintf(NSD_LOG_MIN, "entering lookup (wins)\n");
if (! rq)
return NSD_ERROR;
map = nsd_attr_fetch_string(rq->f_attrs, "table", (char*)0);
if (! map) {
rq->f_status = NS_FATAL;
return NSD_ERROR;
}
key = nsd_attr_fetch_string(rq->f_attrs, "key", (char*)0);
if (! key || ! *key) {
rq->f_status = NS_FATAL;
return NSD_ERROR;
}
response[0] = '\0';
len = sizeof(response) - 2;
/*
* response needs to be a string of the following format
* ip_address[ ip_address]*\tname[ alias]*
*/
if (strcasecmp_m(map,"hosts.byaddr") == 0) {
char *name;
name = lookup_byaddr_backend(key);
if (name != NULL) {
size = strlen(key) + 1;
if (size > len) {
return NSD_ERROR;
}
len -= size;
strncat(response,key,size);
strncat(response,"\t",1);
size = strlen(name) + 1;
if (size > len) {
return NSD_ERROR;
}
len -= size;
strncat(response, name, size);
strncat(response, " ", 1);
found = True;
}
response[strlen(response)-1] = '\n';
} else if (strcasecmp_m(map,"hosts.byname") == 0) {
char *ip;
ip = lookup_byname_backend(key);
if (ip != NULL) {
size = strlen(ip) + 1;
if (size > len) {
wbcFreeMemory(ip);
return NSD_ERROR;
}
len -= size;
strncat(response,ip,size);
strncat(response,"\t",1);
size = strlen(key) + 1;
wbcFreeMemory(ip);
if (size > len) {
return NSD_ERROR;
}
strncat(response,key,size);
strncat(response,"\n",1);
found = True;
}
}
if (found) {
nsd_logprintf(NSD_LOG_LOW, "lookup (wins %s) %s\n",map,response);
nsd_set_result(rq,NS_SUCCESS,response,strlen(response),VOLATILE);
return NSD_OK;
}
nsd_logprintf(NSD_LOG_LOW, "lookup (wins) not found\n");
rq->f_status = NS_NOTFOUND;
return NSD_NEXT;
}
#else
/* Allocate some space from the nss static buffer. The buffer and buflen
are the pointers passed in by the C library to the _nss_*_*
functions. */
static char *get_static(char **buffer, size_t *buflen, size_t len)
{
char *result;
/* Error check. We return false if things aren't set up right, or
there isn't enough buffer space left. */
if ((buffer == NULL) || (buflen == NULL) || (*buflen < len)) {
return NULL;
}
/* Return an index into the static buffer */
result = *buffer;
*buffer += len;
*buflen -= len;
return result;
}
/****************************************************************************
gethostbyname() - we ignore any domain portion of the name and only
handle names that are at most 15 characters long
**************************************************************************/
_PUBLIC_ON_LINUX_
NSS_STATUS
_nss_wins_gethostbyname_r(const char *hostname,
struct hostent *he,
char *buffer,
size_t buflen,
int *errnop,
int *h_errnop)
{
NSS_STATUS nss_status = NSS_STATUS_SUCCESS;
char *ip;
struct in_addr in;
int i;
fstring name;
size_t namelen;
int rc;
#ifdef HAVE_PTHREAD
pthread_mutex_lock(&wins_nss_mutex);
#endif
memset(he, '\0', sizeof(*he));
fstrcpy(name, hostname);
/* Do lookup */
ip = lookup_byname_backend(name);
if (ip == NULL) {
*h_errnop = HOST_NOT_FOUND;
nss_status = NSS_STATUS_NOTFOUND;
goto out;
}
rc = inet_pton(AF_INET, ip, &in);
wbcFreeMemory(ip);
if (rc == 0) {
*errnop = errno;
*h_errnop = NETDB_INTERNAL;
nss_status = NSS_STATUS_TRYAGAIN;
goto out;
}
/* Copy h_name */
namelen = strlen(name) + 1;
if ((he->h_name = get_static(&buffer, &buflen, namelen)) == NULL) {
*errnop = EAGAIN;
*h_errnop = NETDB_INTERNAL;
nss_status = NSS_STATUS_TRYAGAIN;
goto out;
}
memcpy(he->h_name, name, namelen);
/* Copy h_addr_list, align to pointer boundary first */
if ((i = (unsigned long)(buffer) % sizeof(char*)) != 0)
i = sizeof(char*) - i;
if (get_static(&buffer, &buflen, i) == NULL) {
*errnop = EAGAIN;
*h_errnop = NETDB_INTERNAL;
nss_status = NSS_STATUS_TRYAGAIN;
goto out;
}
if ((he->h_addr_list = (char **)get_static(
&buffer, &buflen, 2 * sizeof(char *))) == NULL) {
*errnop = EAGAIN;
*h_errnop = NETDB_INTERNAL;
nss_status = NSS_STATUS_TRYAGAIN;
goto out;
}
if ((he->h_addr_list[0] = get_static(&buffer, &buflen,
INADDRSZ)) == NULL) {
*errnop = EAGAIN;
*h_errnop = NETDB_INTERNAL;
nss_status = NSS_STATUS_TRYAGAIN;
goto out;
}
memcpy(he->h_addr_list[0], &in, INADDRSZ);
he->h_addr_list[1] = NULL;
/* Set h_addr_type and h_length */
he->h_addrtype = AF_INET;
he->h_length = INADDRSZ;
/* Set h_aliases */
if ((i = (unsigned long)(buffer) % sizeof(char*)) != 0)
i = sizeof(char*) - i;
if (get_static(&buffer, &buflen, i) == NULL) {
*errnop = EAGAIN;
*h_errnop = NETDB_INTERNAL;
nss_status = NSS_STATUS_TRYAGAIN;
goto out;
}
if ((he->h_aliases = (char **)get_static(
&buffer, &buflen, sizeof(char *))) == NULL) {
*errnop = EAGAIN;
*h_errnop = NETDB_INTERNAL;
nss_status = NSS_STATUS_TRYAGAIN;
goto out;
}
he->h_aliases[0] = NULL;
*h_errnop = NETDB_SUCCESS;
nss_status = NSS_STATUS_SUCCESS;
out:
#ifdef HAVE_PTHREAD
pthread_mutex_unlock(&wins_nss_mutex);
#endif
return nss_status;
}
_PUBLIC_ON_LINUX_
NSS_STATUS
_nss_wins_gethostbyname2_r(const char *name,
int af,
struct hostent *he,
char *buffer,
size_t buflen,
int *errnop,
int *h_errnop)
{
NSS_STATUS nss_status;
if(af!=AF_INET) {
*errnop = EAFNOSUPPORT;
*h_errnop = NO_DATA;
nss_status = NSS_STATUS_UNAVAIL;
} else {
nss_status = _nss_wins_gethostbyname_r(name,
he,
buffer,
buflen,
errnop,
h_errnop);
}
return nss_status;
}
#endif