Line data    Source code

       1             : /* 
       2             :    Unix SMB/CIFS implementation.
       3             : 
       4             :    NBT server task
       5             : 
       6             :    Copyright (C) Andrew Tridgell        2005
       7             :    
       8             :    This program is free software; you can redistribute it and/or modify
       9             :    it under the terms of the GNU General Public License as published by
      10             :    the Free Software Foundation; either version 3 of the License, or
      11             :    (at your option) any later version.
      12             :    
      13             :    This program is distributed in the hope that it will be useful,
      14             :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      15             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      16             :    GNU General Public License for more details.
      17             :    
      18             :    You should have received a copy of the GNU General Public License
      19             :    along with this program.  If not, see <http://www.gnu.org/licenses/>.
      20             : */
      21             : 
      22             : #include "includes.h"
      23             : #include "samba/service_task.h"
      24             : #include "samba/service.h"
      25             : #include "nbt_server/nbt_server.h"
      26             : #include "nbt_server/wins/winsserver.h"
      27             : #include "system/network.h"
      28             : #include "lib/socket/netif.h"
      29             : #include "auth/auth.h"
      30             : #include "dsdb/samdb/samdb.h"
      31             : #include "param/param.h"
      32             : #include "dynconfig/dynconfig.h"
      33             : #include "lib/util/pidfile.h"
      34             : #include "lib/util/util_net.h"
      35             : #include "lib/socket/socket.h"
      36             : #include "../source3/include/fstring.h"
      37             : #include "../source3/libsmb/nmblib.h"
      38             : #include "../source3/libsmb/unexpected.h"
      39             : #include "../source3/lib/util_procid.h"
      40             : 
      41             : NTSTATUS server_service_nbtd_init(TALLOC_CTX *);
      42             : 
      43          15 : static void nbtd_server_msg_send_packet(struct imessaging_context *msg,
      44             :                                         void *private_data,
      45             :                                         uint32_t msg_type,
      46             :                                         struct server_id src,
      47             :                                         size_t num_fds,
      48             :                                         int *fds,
      49             :                                         DATA_BLOB *data)
      50             : {
      51          15 :         TALLOC_CTX *frame = talloc_stackframe();
      52           0 :         struct nbtd_server *nbtsrv =
      53          15 :                 talloc_get_type_abort(private_data,
      54             :                 struct nbtd_server);
      55          15 :         struct packet_struct *p = (struct packet_struct *)data->data;
      56           0 :         struct sockaddr_storage ss;
      57          15 :         struct socket_address *dst = NULL;
      58          15 :         struct nbtd_interface *iface = NULL;
      59          15 :         char buf[1024] = { 0, };
      60          15 :         DATA_BLOB blob = { .length = 0, };
      61             : 
      62          15 :         DBG_DEBUG("Received send_packet from %u\n", (unsigned int)procid_to_pid(&src));
      63             : 
      64          15 :         if (data->length != sizeof(struct packet_struct)) {
      65           0 :                 DBG_WARNING("Discarding invalid packet length from %u\n",
      66             :                           (unsigned int)procid_to_pid(&src));
      67           0 :                 TALLOC_FREE(frame);
      68           0 :                 return;
      69             :         }
      70             : 
      71          15 :         if ((p->packet_type != NMB_PACKET) &&
      72          15 :             (p->packet_type != DGRAM_PACKET)) {
      73           0 :                 DBG_WARNING("Discarding invalid packet type from %u: %d\n",
      74             :                           (unsigned int)procid_to_pid(&src), p->packet_type);
      75           0 :                 TALLOC_FREE(frame);
      76           0 :                 return;
      77             :         }
      78             : 
      79          15 :         if (p->packet_type == DGRAM_PACKET) {
      80          15 :                 p->port = 138;
      81             :         }
      82             : 
      83          15 :         in_addr_to_sockaddr_storage(&ss, p->ip);
      84          15 :         dst = socket_address_from_sockaddr_storage(frame, &ss, p->port);
      85          15 :         if (dst == NULL) {
      86           0 :                 TALLOC_FREE(frame);
      87           0 :                 return;
      88             :         }
      89          15 :         if (p->port == 0) {
      90           0 :                 DBG_WARNING("Discarding packet with missing port for addr[%s] "
      91             :                             "from %u\n",
      92             :                             dst->addr, (unsigned int)procid_to_pid(&src));
      93           0 :                 TALLOC_FREE(frame);
      94           0 :                 return;
      95             :         }
      96             : 
      97          15 :         iface = nbtd_find_request_iface(nbtsrv, dst->addr, true);
      98          15 :         if (iface == NULL) {
      99           0 :                 DBG_WARNING("Could not find iface for packet to addr[%s] "
     100             :                             "from %u\n",
     101             :                             dst->addr, (unsigned int)procid_to_pid(&src));
     102           0 :                 TALLOC_FREE(frame);
     103           0 :                 return;
     104             :         }
     105             : 
     106          15 :         p->recv_fd = -1;
     107          15 :         p->send_fd = -1;
     108             : 
     109          15 :         if (p->packet_type == DGRAM_PACKET) {
     110          15 :                 p->packet.dgram.header.source_ip.s_addr = interpret_addr(iface->ip_address);
     111          15 :                 p->packet.dgram.header.source_port = 138;
     112             :         }
     113             : 
     114          15 :         blob.length = build_packet(buf, sizeof(buf), p);
     115          15 :         if (blob.length == 0) {
     116           0 :                 TALLOC_FREE(frame);
     117           0 :                 return;
     118             :         }
     119          15 :         blob.data = (uint8_t *)buf;
     120             : 
     121          15 :         if (p->packet_type == DGRAM_PACKET) {
     122          15 :                 nbt_dgram_send_raw(iface->dgmsock, dst, blob);
     123             :         } else {
     124           0 :                 nbt_name_send_raw(iface->nbtsock, dst, blob);
     125             :         }
     126             : 
     127          15 :         TALLOC_FREE(frame);
     128             : }
     129             : 
     130          65 : static int nbtd_server_destructor(struct nbtd_server *nbtsrv)
     131             : {
     132          65 :         struct task_server *task = nbtsrv->task;
     133             : 
     134          65 :         pidfile_unlink(lpcfg_pid_directory(task->lp_ctx), "nmbd");
     135             : 
     136          65 :         return 0;
     137             : }
     138             : 
     139             : /*
     140             :   startup the nbtd task
     141             : */
     142          65 : static NTSTATUS nbtd_task_init(struct task_server *task)
     143             : {
     144           2 :         struct nbtd_server *nbtsrv;
     145           2 :         NTSTATUS status;
     146           2 :         struct interface *ifaces;
     147          65 :         const char *nmbd_socket_dir = NULL;
     148           2 :         int unexpected_clients;
     149             : 
     150          65 :         load_interface_list(task, task->lp_ctx, &ifaces);
     151             : 
     152          65 :         if (iface_list_count(ifaces) == 0) {
     153           0 :                 task_server_terminate(task, "nbtd: no network interfaces configured", false);
     154           0 :                 return NT_STATUS_UNSUCCESSFUL;
     155             :         }
     156             : 
     157          65 :         if (lpcfg_disable_netbios(task->lp_ctx)) {
     158           0 :                 task_server_terminate(task, "nbtd: 'disable netbios = yes' set in smb.conf, shutting down nbt server", false);
     159           0 :                 return NT_STATUS_UNSUCCESSFUL;
     160             :         }
     161             : 
     162          65 :         task_server_set_title(task, "task[nbtd]");
     163             : 
     164          65 :         nbtsrv = talloc(task, struct nbtd_server);
     165          65 :         if (nbtsrv == NULL) {
     166           0 :                 task_server_terminate(task, "nbtd: out of memory", true);
     167           0 :                 return NT_STATUS_NO_MEMORY;
     168             :         }
     169             : 
     170          65 :         nbtsrv->task            = task;
     171          65 :         nbtsrv->interfaces      = NULL;
     172          65 :         nbtsrv->bcast_interface = NULL;
     173          65 :         nbtsrv->wins_interface  = NULL;
     174             : 
     175          65 :         talloc_set_destructor(nbtsrv, nbtd_server_destructor);
     176             : 
     177             :         /* start listening on the configured network interfaces */
     178          65 :         status = nbtd_startup_interfaces(nbtsrv, task->lp_ctx, ifaces);
     179          65 :         if (!NT_STATUS_IS_OK(status)) {
     180           0 :                 task_server_terminate(task, "nbtd failed to setup interfaces", true);
     181           0 :                 return status;
     182             :         }
     183             : 
     184          65 :         nmbd_socket_dir = lpcfg_parm_string(task->lp_ctx,
     185             :                                             NULL,
     186             :                                             "nmbd",
     187             :                                             "socket dir");
     188          65 :         if (nmbd_socket_dir == NULL) {
     189           0 :                 nmbd_socket_dir = get_dyn_NMBDSOCKETDIR();
     190             :         }
     191             : 
     192          65 :         unexpected_clients = lpcfg_parm_int(task->lp_ctx,
     193             :                                             NULL,
     194             :                                             "nmbd",
     195             :                                             "unexpected_clients",
     196             :                                             200);
     197             : 
     198          67 :         status = nb_packet_server_create(nbtsrv,
     199          65 :                                          nbtsrv->task->event_ctx,
     200             :                                          nmbd_socket_dir,
     201             :                                          unexpected_clients,
     202             :                                          &nbtsrv->unexpected_server);
     203          65 :         if (!NT_STATUS_IS_OK(status)) {
     204           0 :                 task_server_terminate(task, "nbtd failed to start unexpected_server", true);
     205           0 :                 return status;
     206             :         }
     207             : 
     208          65 :         nbtsrv->sam_ctx = samdb_connect(nbtsrv,
     209             :                                         task->event_ctx,
     210             :                                         task->lp_ctx,
     211             :                                         system_session(task->lp_ctx),
     212             :                                         NULL,
     213             :                                         0);
     214          65 :         if (nbtsrv->sam_ctx == NULL) {
     215           0 :                 task_server_terminate(task, "nbtd failed to open samdb", true);
     216           0 :                 return NT_STATUS_UNSUCCESSFUL;
     217             :         }
     218             : 
     219             :         /* start the WINS server, if appropriate */
     220          65 :         status = nbtd_winsserver_init(nbtsrv);
     221          65 :         if (!NT_STATUS_IS_OK(status)) {
     222           0 :                 task_server_terminate(task, "nbtd failed to start WINS server", true);
     223           0 :                 return status;
     224             :         }
     225             : 
     226          65 :         nbtd_register_irpc(nbtsrv);
     227             : 
     228          65 :         status = imessaging_register(task->msg_ctx,
     229             :                                      nbtsrv,
     230             :                                      MSG_SEND_PACKET,
     231             :                                      nbtd_server_msg_send_packet);
     232          65 :         if (!NT_STATUS_IS_OK(status)) {
     233           0 :                 task_server_terminate(task, "nbtd failed imessaging_register(MSG_SEND_PACKET)", true);
     234           0 :                 return status;
     235             :         }
     236             : 
     237             :         /* start the process of registering our names on all interfaces */
     238          65 :         nbtd_register_names(nbtsrv);
     239             : 
     240          65 :         irpc_add_name(task->msg_ctx, "nbt_server");
     241             : 
     242          65 :         pidfile_create(lpcfg_pid_directory(task->lp_ctx), "nmbd");
     243             : 
     244          65 :         return NT_STATUS_OK;
     245             : }
     246             : 
     247             : 
     248             : /*
     249             :   register ourselves as a available server
     250             : */
     251          66 : NTSTATUS server_service_nbtd_init(TALLOC_CTX *ctx)
     252             : {
     253           3 :         static const struct service_details details = {
     254             :                 .inhibit_fork_on_accept = true,
     255             :                 .inhibit_pre_fork = true,
     256             :                 .task_init = nbtd_task_init,
     257             :                 .post_fork = NULL
     258             :         };
     259          66 :         return register_server_service(ctx, "nbt", &details);
     260             : }