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https://github.com/samba-team/samba.git
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d892ce2750
Signed-off-by: Michael Adam <obnox@samba.org> Reviewed-by: Ira Cooper <ira@samba.org>
417 lines
9.2 KiB
C
417 lines
9.2 KiB
C
/*
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Unix SMB/CIFS implementation.
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a WINS nsswitch module
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Copyright (C) Andrew Tridgell 1999
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "nsswitch/winbind_nss.h"
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#ifdef HAVE_NS_API_H
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#include <ns_daemon.h>
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#endif
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#if HAVE_PTHREAD_H
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#include <pthread.h>
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#endif
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#if HAVE_PTHREAD
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static pthread_mutex_t wins_nss_mutex = PTHREAD_MUTEX_INITIALIZER;
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#endif
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#ifndef INADDRSZ
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#define INADDRSZ 4
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#endif
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static int initialised;
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NSS_STATUS _nss_wins_gethostbyname_r(const char *hostname, struct hostent *he,
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char *buffer, size_t buflen, int *h_errnop);
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NSS_STATUS _nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he,
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char *buffer, size_t buflen, int *h_errnop);
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static void nss_wins_init(void)
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{
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initialised = 1;
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lp_set_cmdline("log level", "0");
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TimeInit();
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setup_logging("nss_wins",False);
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lp_load_global(get_dyn_CONFIGFILE());
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load_interfaces();
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}
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static struct in_addr *lookup_byname_backend(const char *name, int *count)
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{
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TALLOC_CTX *frame;
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struct sockaddr_storage *address = NULL;
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struct in_addr *ret = NULL;
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NTSTATUS status;
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const char *p;
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size_t nbt_len;
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int j;
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if (!initialised) {
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nss_wins_init();
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}
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*count = 0;
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nbt_len = strlen(name);
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if (nbt_len > MAX_NETBIOSNAME_LEN - 1) {
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return NULL;
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}
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p = strchr(name, '.');
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if (p != NULL) {
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return NULL;
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}
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frame = talloc_stackframe();
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/* always try with wins first */
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status = resolve_wins(name, 0x00, talloc_tos(),
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&address, count);
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if (NT_STATUS_IS_OK(status)) {
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if ( (ret = SMB_MALLOC_P(struct in_addr)) == NULL ) {
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TALLOC_FREE(frame);
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return NULL;
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}
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if (address[0].ss_family != AF_INET) {
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free(ret);
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TALLOC_FREE(frame);
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return NULL;
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}
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*ret = ((struct sockaddr_in *)(void *)address)
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->sin_addr;
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TALLOC_FREE(frame);
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return ret;
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}
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/* uggh, we have to broadcast to each interface in turn */
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for (j=iface_count() - 1;j >= 0;j--) {
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const struct in_addr *bcast = iface_n_bcast_v4(j);
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struct sockaddr_storage ss;
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struct sockaddr_storage *pss;
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if (!bcast) {
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continue;
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}
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in_addr_to_sockaddr_storage(&ss, *bcast);
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status = name_query(name, 0x00, True, True, &ss,
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talloc_tos(), &pss, count, NULL);
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if (NT_STATUS_IS_OK(status) && (*count > 0)) {
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if ((ret = SMB_MALLOC_P(struct in_addr)) == NULL) {
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TALLOC_FREE(frame);
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return NULL;
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}
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*ret = ((struct sockaddr_in *)pss)->sin_addr;
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break;
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}
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}
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TALLOC_FREE(frame);
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return ret;
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}
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#ifdef HAVE_NS_API_H
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static struct node_status *lookup_byaddr_backend(char *addr, int *count)
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{
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struct sockaddr_storage ss;
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struct nmb_name nname;
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struct node_status *result;
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NTSTATUS status;
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if (!initialised) {
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nss_wins_init();
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}
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make_nmb_name(&nname, "*", 0);
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if (!interpret_string_addr(&ss, addr, AI_NUMERICHOST)) {
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return NULL;
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}
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status = node_status_query(NULL, &nname, &ss, &result, count, NULL);
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if (!NT_STATUS_IS_OK(status)) {
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return NULL;
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}
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return result;
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}
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/* IRIX version */
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int init(void)
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{
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nsd_logprintf(NSD_LOG_MIN, "entering init (wins)\n");
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nss_wins_init();
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return NSD_OK;
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}
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int lookup(nsd_file_t *rq)
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{
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char *map;
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char *key;
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char *addr;
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struct in_addr *ip_list;
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struct node_status *status;
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int i, count, len, size;
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char response[1024];
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bool found = False;
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nsd_logprintf(NSD_LOG_MIN, "entering lookup (wins)\n");
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if (! rq)
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return NSD_ERROR;
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map = nsd_attr_fetch_string(rq->f_attrs, "table", (char*)0);
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if (! map) {
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rq->f_status = NS_FATAL;
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return NSD_ERROR;
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}
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key = nsd_attr_fetch_string(rq->f_attrs, "key", (char*)0);
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if (! key || ! *key) {
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rq->f_status = NS_FATAL;
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return NSD_ERROR;
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}
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response[0] = '\0';
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len = sizeof(response) - 2;
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/*
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* response needs to be a string of the following format
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* ip_address[ ip_address]*\tname[ alias]*
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*/
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if (strcasecmp_m(map,"hosts.byaddr") == 0) {
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if ( status = lookup_byaddr_backend(key, &count)) {
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size = strlen(key) + 1;
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if (size > len) {
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talloc_free(status);
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return NSD_ERROR;
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}
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len -= size;
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strncat(response,key,size);
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strncat(response,"\t",1);
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for (i = 0; i < count; i++) {
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/* ignore group names */
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if (status[i].flags & 0x80) continue;
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if (status[i].type == 0x20) {
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size = sizeof(status[i].name) + 1;
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if (size > len) {
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talloc_free(status);
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return NSD_ERROR;
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}
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len -= size;
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strncat(response, status[i].name, size);
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strncat(response, " ", 1);
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found = True;
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}
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}
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response[strlen(response)-1] = '\n';
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talloc_free(status);
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}
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} else if (strcasecmp_m(map,"hosts.byname") == 0) {
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if (ip_list = lookup_byname_backend(key, &count)) {
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for (i = count; i ; i--) {
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addr = inet_ntoa(ip_list[i-1]);
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size = strlen(addr) + 1;
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if (size > len) {
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free(ip_list);
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return NSD_ERROR;
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}
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len -= size;
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if (i != 0)
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response[strlen(response)-1] = ' ';
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strncat(response,addr,size);
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strncat(response,"\t",1);
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}
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size = strlen(key) + 1;
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if (size > len) {
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free(ip_list);
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return NSD_ERROR;
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}
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strncat(response,key,size);
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strncat(response,"\n",1);
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found = True;
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free(ip_list);
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}
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}
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if (found) {
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nsd_logprintf(NSD_LOG_LOW, "lookup (wins %s) %s\n",map,response);
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nsd_set_result(rq,NS_SUCCESS,response,strlen(response),VOLATILE);
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return NSD_OK;
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}
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nsd_logprintf(NSD_LOG_LOW, "lookup (wins) not found\n");
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rq->f_status = NS_NOTFOUND;
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return NSD_NEXT;
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}
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#else
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/* Allocate some space from the nss static buffer. The buffer and buflen
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are the pointers passed in by the C library to the _nss_*_*
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functions. */
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static char *get_static(char **buffer, size_t *buflen, int len)
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{
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char *result;
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/* Error check. We return false if things aren't set up right, or
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there isn't enough buffer space left. */
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if ((buffer == NULL) || (buflen == NULL) || (*buflen < len)) {
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return NULL;
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}
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/* Return an index into the static buffer */
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result = *buffer;
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*buffer += len;
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*buflen -= len;
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return result;
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}
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/****************************************************************************
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gethostbyname() - we ignore any domain portion of the name and only
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handle names that are at most 15 characters long
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**************************************************************************/
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NSS_STATUS
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_nss_wins_gethostbyname_r(const char *hostname, struct hostent *he,
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char *buffer, size_t buflen, int *h_errnop)
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{
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NSS_STATUS nss_status = NSS_STATUS_SUCCESS;
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struct in_addr *ip_list;
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int i, count;
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fstring name;
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size_t namelen;
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TALLOC_CTX *frame;
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#if HAVE_PTHREAD
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pthread_mutex_lock(&wins_nss_mutex);
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#endif
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frame = talloc_stackframe();
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memset(he, '\0', sizeof(*he));
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fstrcpy(name, hostname);
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/* Do lookup */
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ip_list = lookup_byname_backend(name, &count);
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if (!ip_list) {
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nss_status = NSS_STATUS_NOTFOUND;
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goto out;
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}
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/* Copy h_name */
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namelen = strlen(name) + 1;
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if ((he->h_name = get_static(&buffer, &buflen, namelen)) == NULL) {
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free(ip_list);
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nss_status = NSS_STATUS_TRYAGAIN;
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goto out;
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}
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memcpy(he->h_name, name, namelen);
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/* Copy h_addr_list, align to pointer boundary first */
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if ((i = (unsigned long)(buffer) % sizeof(char*)) != 0)
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i = sizeof(char*) - i;
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if (get_static(&buffer, &buflen, i) == NULL) {
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free(ip_list);
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nss_status = NSS_STATUS_TRYAGAIN;
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goto out;
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}
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if ((he->h_addr_list = (char **)get_static(
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&buffer, &buflen, (count + 1) * sizeof(char *))) == NULL) {
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free(ip_list);
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nss_status = NSS_STATUS_TRYAGAIN;
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goto out;
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}
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for (i = 0; i < count; i++) {
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if ((he->h_addr_list[i] = get_static(&buffer, &buflen,
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INADDRSZ)) == NULL) {
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free(ip_list);
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nss_status = NSS_STATUS_TRYAGAIN;
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goto out;
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}
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memcpy(he->h_addr_list[i], &ip_list[i], INADDRSZ);
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}
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he->h_addr_list[count] = NULL;
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free(ip_list);
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/* Set h_addr_type and h_length */
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he->h_addrtype = AF_INET;
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he->h_length = INADDRSZ;
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/* Set h_aliases */
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if ((i = (unsigned long)(buffer) % sizeof(char*)) != 0)
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i = sizeof(char*) - i;
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if (get_static(&buffer, &buflen, i) == NULL) {
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nss_status = NSS_STATUS_TRYAGAIN;
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goto out;
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}
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if ((he->h_aliases = (char **)get_static(
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&buffer, &buflen, sizeof(char *))) == NULL) {
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nss_status = NSS_STATUS_TRYAGAIN;
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goto out;
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}
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he->h_aliases[0] = NULL;
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nss_status = NSS_STATUS_SUCCESS;
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out:
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TALLOC_FREE(frame);
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#if HAVE_PTHREAD
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pthread_mutex_unlock(&wins_nss_mutex);
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#endif
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return nss_status;
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}
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NSS_STATUS
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_nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he,
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char *buffer, size_t buflen, int *h_errnop)
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{
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NSS_STATUS nss_status;
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if(af!=AF_INET) {
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*h_errnop = NO_DATA;
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nss_status = NSS_STATUS_UNAVAIL;
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} else {
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nss_status = _nss_wins_gethostbyname_r(
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name, he, buffer, buflen, h_errnop);
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}
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return nss_status;
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}
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#endif
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