source/nbt_server/dgram/request.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    NBT datagram server
   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 "nbt_server/nbt_server.h"
  24 #include "smbd/service_task.h"
  25 #include "lib/socket/socket.h"
  26 #include "libcli/resolve/resolve.h"
  27 #include "nbt_server/dgram/proto.h"
  28 #include "librpc/gen_ndr/ndr_nbt.h"
  29
  30 /*
  31   a list of mailslots that we have static handlers for
  32 */
  33 static const struct {
  34         const char *mailslot_name;
  35         dgram_mailslot_handler_t handler;
  36 } mailslot_handlers[] = {
  37         { NBT_MAILSLOT_NETLOGON, nbtd_mailslot_netlogon_handler },
  38         { NBT_MAILSLOT_NTLOGON,  nbtd_mailslot_ntlogon_handler },
  39         { NBT_MAILSLOT_BROWSE,   nbtd_mailslot_browse_handler }
  40 };
  41
  42 /*
  43   receive an incoming dgram request. This is used for general datagram
  44   requests. Mailslot requests for our listening mailslots
  45   are handled in the specific mailslot handlers
  46 */
  47 void dgram_request_handler(struct nbt_dgram_socket *dgmsock,
  48                            struct nbt_dgram_packet *packet,
  49                            struct socket_address *src)
  50 {
  51         DEBUG(0,("General datagram request from %s:%d\n", src->addr, src->port));
  52         NDR_PRINT_DEBUG(nbt_dgram_packet, packet);
  53 }
  54
  55
  56 /*
  57   setup the port 138 datagram listener for a given interface
  58 */
  59 NTSTATUS nbtd_dgram_setup(struct nbtd_interface *iface, const char *bind_address)
  60 {
  61         struct nbt_dgram_socket *bcast_dgmsock = NULL;
  62         struct nbtd_server *nbtsrv = iface->nbtsrv;
  63         struct socket_address *bcast_addr, *bind_addr;
  64         NTSTATUS status;
  65         TALLOC_CTX *tmp_ctx = talloc_new(iface);
  66         /* the list of mailslots that we are interested in */
  67         int i;
  68
  69         if (!tmp_ctx) {
  70                 return NT_STATUS_NO_MEMORY;
  71         }
  72
  73         if (strcmp("0.0.0.0", iface->netmask) != 0) {
  74                 /* listen for broadcasts on port 138 */
  75                 bcast_dgmsock = nbt_dgram_socket_init(iface, nbtsrv->task->event_ctx);
  76                 if (!bcast_dgmsock) {
  77                         talloc_free(tmp_ctx);
  78                         return NT_STATUS_NO_MEMORY;
  79                 }
  80
  81                 bcast_addr = socket_address_from_strings(tmp_ctx, bcast_dgmsock->sock->backend_name,
  82                                                          iface->bcast_address, lp_dgram_port());
  83                 if (!bcast_addr) {
  84                         talloc_free(tmp_ctx);
  85                         return NT_STATUS_NO_MEMORY;
  86                 }
  87
  88                 status = socket_listen(bcast_dgmsock->sock, bcast_addr, 0, 0);
  89                 if (!NT_STATUS_IS_OK(status)) {
  90                         talloc_free(tmp_ctx);
  91                         DEBUG(0,("Failed to bind to %s:%d - %s\n",
  92                                  iface->bcast_address, lp_dgram_port(), nt_errstr(status)));
  93                         return status;
  94                 }
  95
  96                 dgram_set_incoming_handler(bcast_dgmsock, dgram_request_handler, iface);
  97         }
  98
  99         /* listen for unicasts on port 138 */
 100         iface->dgmsock = nbt_dgram_socket_init(iface, nbtsrv->task->event_ctx);
 101         if (!iface->dgmsock) {
 102                 talloc_free(tmp_ctx);
 103                 return NT_STATUS_NO_MEMORY;
 104         }
 105
 106         bind_addr = socket_address_from_strings(tmp_ctx, iface->dgmsock->sock->backend_name,
 107                                                 bind_address, lp_dgram_port());
 108         if (!bind_addr) {
 109                 talloc_free(tmp_ctx);
 110                 return NT_STATUS_NO_MEMORY;
 111         }
 112
 113         status = socket_listen(iface->dgmsock->sock, bind_addr, 0, 0);
 114         if (!NT_STATUS_IS_OK(status)) {
 115                 talloc_free(tmp_ctx);
 116                 DEBUG(0,("Failed to bind to %s:%d - %s\n",
 117                          bind_address, lp_dgram_port(), nt_errstr(status)));
 118                 return status;
 119         }
 120
 121         dgram_set_incoming_handler(iface->dgmsock, dgram_request_handler, iface);
 122
 123         talloc_free(tmp_ctx);
 124
 125         for (i=0;i<ARRAY_SIZE(mailslot_handlers);i++) {
 126                 /* note that we don't need to keep the pointer
 127                    to the dgmslot around - the callback is all
 128                    we need */
 129                 struct dgram_mailslot_handler *dgmslot;
 130
 131                 if (bcast_dgmsock) {
 132                         dgmslot = dgram_mailslot_listen(bcast_dgmsock,
 133                                                 mailslot_handlers[i].mailslot_name,
 134                                                 mailslot_handlers[i].handler, iface);
 135                         NT_STATUS_HAVE_NO_MEMORY(dgmslot);
 136                 }
 137
 138                 dgmslot = dgram_mailslot_listen(iface->dgmsock,
 139                                                 mailslot_handlers[i].mailslot_name,
 140                                                 mailslot_handlers[i].handler, iface);
 141                 NT_STATUS_HAVE_NO_MEMORY(dgmslot);
 142         }
 143
 144         return NT_STATUS_OK;
 145 }