/*
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 .
*/
#include "includes.h"
#ifdef HAVE_NS_API_H
#undef VOLATILE
#include
#endif
#ifndef INADDRSZ
#define INADDRSZ 4
#endif
static int initialised;
extern BOOL AllowDebugChange;
NSS_STATUS _nss_wins_gethostbyname_r(const char *hostname, struct hostent *he,
char *buffer, size_t buflen, int *h_errnop);
NSS_STATUS _nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he,
char *buffer, size_t buflen, int *h_errnop);
/* Use our own create socket code so we don't recurse.... */
static int wins_lookup_open_socket_in(void)
{
struct sockaddr_in sock;
int val=1;
int res;
memset((char *)&sock,'\0',sizeof(sock));
#ifdef HAVE_SOCK_SIN_LEN
sock.sin_len = sizeof(sock);
#endif
sock.sin_port = 0;
sock.sin_family = AF_INET;
sock.sin_addr.s_addr = interpret_addr("0.0.0.0");
res = socket(AF_INET, SOCK_DGRAM, 0);
if (res == -1)
return -1;
setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val));
#ifdef SO_REUSEPORT
setsockopt(res,SOL_SOCKET,SO_REUSEPORT,(char *)&val,sizeof(val));
#endif /* SO_REUSEPORT */
/* now we've got a socket - we need to bind it */
if (bind(res, (struct sockaddr * ) &sock,sizeof(sock)) < 0) {
close(res);
return(-1);
}
set_socket_options(res,"SO_BROADCAST");
return res;
}
static void nss_wins_init(void)
{
initialised = 1;
DEBUGLEVEL = 0;
AllowDebugChange = False;
TimeInit();
setup_logging("nss_wins",False);
load_case_tables();
lp_load(dyn_CONFIGFILE,True,False,False,True);
load_interfaces();
}
static struct in_addr *lookup_byname_backend(const char *name, int *count)
{
int fd = -1;
struct ip_service *address = NULL;
struct in_addr *ret = NULL;
int j, flags = 0;
if (!initialised) {
nss_wins_init();
}
*count = 0;
/* always try with wins first */
if (NT_STATUS_IS_OK(resolve_wins(name,0x00,&address,count))) {
if ( (ret = SMB_MALLOC_P(struct in_addr)) == NULL ) {
free( address );
return NULL;
}
*ret = address[0].ip;
free( address );
return ret;
}
fd = wins_lookup_open_socket_in();
if (fd == -1) {
return NULL;
}
/* uggh, we have to broadcast to each interface in turn */
for (j=iface_count() - 1;j >= 0;j--) {
struct in_addr *bcast = iface_n_bcast(j);
ret = name_query(fd,name,0x00,True,True,*bcast,count, &flags, NULL);
if (ret) break;
}
close(fd);
return ret;
}
#ifdef HAVE_NS_API_H
static NODE_STATUS_STRUCT *lookup_byaddr_backend(char *addr, int *count)
{
int fd;
struct in_addr ip;
struct nmb_name nname;
NODE_STATUS_STRUCT *status;
if (!initialised) {
nss_wins_init();
}
fd = wins_lookup_open_socket_in();
if (fd == -1)
return NULL;
make_nmb_name(&nname, "*", 0);
ip = *interpret_addr2(addr);
status = node_status_query(fd,&nname,ip, count, NULL);
close(fd);
return status;
}
/* IRIX version */
int init(void)
{
nsd_logprintf(NSD_LOG_MIN, "entering init (wins)\n");
nss_wins_init();
return NSD_OK;
}
int lookup(nsd_file_t *rq)
{
char *map;
char *key;
char *addr;
struct in_addr *ip_list;
NODE_STATUS_STRUCT *status;
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(map,"hosts.byaddr") == 0) {
if ( status = lookup_byaddr_backend(key, &count)) {
size = strlen(key) + 1;
if (size > len) {
free(status);
return NSD_ERROR;
}
len -= size;
strncat(response,key,size);
strncat(response,"\t",1);
for (i = 0; i < count; i++) {
/* ignore group names */
if (status[i].flags & 0x80) continue;
if (status[i].type == 0x20) {
size = sizeof(status[i].name) + 1;
if (size > len) {
free(status);
return NSD_ERROR;
}
len -= size;
strncat(response, status[i].name, size);
strncat(response, " ", 1);
found = True;
}
}
response[strlen(response)-1] = '\n';
free(status);
}
} else if (StrCaseCmp(map,"hosts.byname") == 0) {
if (ip_list = lookup_byname_backend(key, &count)) {
for (i = count; i ; i--) {
addr = inet_ntoa(ip_list[i-1]);
size = strlen(addr) + 1;
if (size > len) {
free(ip_list);
return NSD_ERROR;
}
len -= size;
if (i != 0)
response[strlen(response)-1] = ' ';
strncat(response,addr,size);
strncat(response,"\t",1);
}
size = strlen(key) + 1;
if (size > len) {
free(ip_list);
return NSD_ERROR;
}
strncat(response,key,size);
strncat(response,"\n",1);
found = True;
free(ip_list);
}
}
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, int 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
**************************************************************************/
NSS_STATUS
_nss_wins_gethostbyname_r(const char *hostname, struct hostent *he,
char *buffer, size_t buflen, int *h_errnop)
{
struct in_addr *ip_list;
int i, count;
fstring name;
size_t namelen;
memset(he, '\0', sizeof(*he));
fstrcpy(name, hostname);
/* Do lookup */
ip_list = lookup_byname_backend(name, &count);
if (!ip_list)
return NSS_STATUS_NOTFOUND;
/* Copy h_name */
namelen = strlen(name) + 1;
if ((he->h_name = get_static(&buffer, &buflen, namelen)) == NULL)
return NSS_STATUS_TRYAGAIN;
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)
return NSS_STATUS_TRYAGAIN;
if ((he->h_addr_list = (char **)get_static(
&buffer, &buflen, (count + 1) * sizeof(char *))) == NULL)
return NSS_STATUS_TRYAGAIN;
for (i = 0; i < count; i++) {
if ((he->h_addr_list[i] = get_static(&buffer, &buflen,
INADDRSZ)) == NULL)
return NSS_STATUS_TRYAGAIN;
memcpy(he->h_addr_list[i], &ip_list[i], INADDRSZ);
}
he->h_addr_list[count] = NULL;
if (ip_list)
free(ip_list);
/* 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)
return NSS_STATUS_TRYAGAIN;
if ((he->h_aliases = (char **)get_static(
&buffer, &buflen, sizeof(char *))) == NULL)
return NSS_STATUS_TRYAGAIN;
he->h_aliases[0] = NULL;
return NSS_STATUS_SUCCESS;
}
NSS_STATUS
_nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he,
char *buffer, size_t buflen, int *h_errnop)
{
if(af!=AF_INET) {
*h_errnop = NO_DATA;
return NSS_STATUS_UNAVAIL;
}
return _nss_wins_gethostbyname_r(
name, he, buffer, buflen, h_errnop);
}
#endif