2 Unix SMB/CIFS implementation.
6 Copyright (C) Andrew Tridgell 2005
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 2 of the License, or
11 (at your option) any later version.
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.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include "lib/events/events.h"
25 #include "dlinklist.h"
26 #include "nbt_server/nbt_server.h"
27 #include "smbd/service_task.h"
28 #include "libcli/raw/libcliraw.h"
29 #include "libcli/composite/composite.h"
32 static void nbtd_start_refresh_timer(struct nbt_iface_name *iname);
35 a name refresh request has completed
37 static void refresh_completion_handler(struct nbt_name_request *req)
39 struct nbt_iface_name *iname = talloc_get_type(req->async.private, struct nbt_iface_name);
41 struct nbt_name_refresh io;
42 TALLOC_CTX *tmp_ctx = talloc_new(iname);
44 status = nbt_name_refresh_recv(req, tmp_ctx, &io);
45 if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
46 DEBUG(4,("Refreshed name %s<%02x> on %s\n",
47 iname->name.name, iname->name.type, iname->iface->ip_address));
48 iname->registration_time = timeval_current();
49 nbtd_start_refresh_timer(iname);
54 iname->nb_flags |= NBT_NM_CONFLICT;
55 iname->nb_flags &= ~NBT_NM_ACTIVE;
57 if (NT_STATUS_IS_OK(status)) {
58 DEBUG(1,("Name conflict from %s refreshing name %s<%02x> on %s - rcode %d\n",
59 io.out.reply_addr, iname->name.name, iname->name.type,
60 iname->iface->ip_address, io.out.rcode));
62 DEBUG(1,("Error refreshing name %s<%02x> on %s - %s\n",
63 iname->name.name, iname->name.type, iname->iface->ip_address,
72 handle name refresh timer events
74 static void name_refresh_handler(struct event_context *ev, struct timed_event *te,
75 struct timeval t, void *private)
77 struct nbt_iface_name *iname = talloc_get_type(private, struct nbt_iface_name);
78 struct nbt_interface *iface = iname->iface;
79 struct nbt_name_refresh io;
80 struct nbt_name_request *req;
82 /* setup a name refresh request */
83 io.in.name = iname->name;
84 io.in.dest_addr = iface->bcast_address;
85 io.in.address = iface->ip_address;
86 io.in.nb_flags = iname->nb_flags;
87 io.in.ttl = iname->ttl;
88 io.in.broadcast = True;
91 req = nbt_name_refresh_send(iface->nbtsock, &io);
92 if (req == NULL) return;
94 req->async.fn = refresh_completion_handler;
95 req->async.private = iname;
100 start a timer to refresh this name
102 static void nbtd_start_refresh_timer(struct nbt_iface_name *iname)
104 uint32_t refresh_time;
105 uint32_t max_refresh_time = lp_parm_int(-1, "nbtd", "max_refresh_time", 7200);
107 refresh_time = MIN(max_refresh_time, iname->ttl/2);
109 event_add_timed(iname->iface->nbtsrv->task->event_ctx,
111 timeval_current_ofs(refresh_time, 0),
112 name_refresh_handler, iname);
117 a name registration has completed
119 static void nbtd_register_handler(struct composite_context *req)
121 struct nbt_iface_name *iname = talloc_get_type(req->async.private,
122 struct nbt_iface_name);
125 status = nbt_name_register_bcast_recv(req);
126 if (NT_STATUS_IS_OK(status)) {
127 /* good - nobody complained about our registration */
128 iname->nb_flags |= NBT_NM_ACTIVE;
129 DEBUG(3,("Registered %s<%02x> on interface %s\n",
130 iname->name.name, iname->name.type, iname->iface->bcast_address));
131 iname->registration_time = timeval_current();
132 nbtd_start_refresh_timer(iname);
136 /* someone must have replied with an objection! */
137 iname->nb_flags |= NBT_NM_CONFLICT;
139 DEBUG(1,("Error registering %s<%02x> on interface %s - %s\n",
140 iname->name.name, iname->name.type, iname->iface->bcast_address,
146 register a name on a network interface
148 static void nbtd_register_name_iface(struct nbt_interface *iface,
149 const char *name, enum nbt_name_type type,
152 struct nbt_iface_name *iname;
153 const char *scope = lp_netbios_scope();
154 struct nbt_name_register_bcast io;
155 struct composite_context *req;
157 iname = talloc(iface, struct nbt_iface_name);
160 iname->iface = iface;
161 iname->name.name = talloc_strdup(iname, name);
162 iname->name.type = type;
163 if (scope && *scope) {
164 iname->name.scope = talloc_strdup(iname, scope);
166 iname->name.scope = NULL;
168 iname->nb_flags = nb_flags;
169 iname->ttl = lp_parm_int(-1, "nbtd", "bcast_ttl", 300000);
170 iname->registration_time = timeval_zero();
172 DLIST_ADD_END(iface->names, iname, struct nbt_iface_name *);
174 if (nb_flags & NBT_NM_PERMANENT) {
175 /* permanent names are not announced and are immediately active */
176 iname->nb_flags |= NBT_NM_ACTIVE;
181 /* setup a broadcast name registration request */
182 io.in.name = iname->name;
183 io.in.dest_addr = iface->bcast_address;
184 io.in.address = iface->ip_address;
185 io.in.nb_flags = nb_flags;
186 io.in.ttl = iname->ttl;
188 req = nbt_name_register_bcast_send(iface->nbtsock, &io);
189 if (req == NULL) return;
191 req->async.fn = nbtd_register_handler;
192 req->async.private = iname;
197 register one name on all our interfaces
199 static void nbtd_register_name(struct nbt_server *nbtsrv,
200 const char *name, enum nbt_name_type type,
203 struct nbt_interface *iface;
205 /* register with all the local interfaces */
206 for (iface=nbtsrv->interfaces;iface;iface=iface->next) {
207 nbtd_register_name_iface(iface, name, type, nb_flags);
210 /* register on our general broadcast interface as a permanent name */
211 if (nbtsrv->bcast_interface) {
212 nbtd_register_name_iface(nbtsrv->bcast_interface, name, type,
213 nb_flags | NBT_NM_PERMANENT);
216 /* TODO: register with our WINS servers */
221 register our names on all interfaces
223 void nbtd_register_names(struct nbt_server *nbtsrv)
225 uint16_t nb_flags = NBT_NODE_M;
227 /* note that we don't initially mark the names "ACTIVE". They are
228 marked active once registration is successful */
229 nbtd_register_name(nbtsrv, lp_netbios_name(), NBT_NAME_CLIENT, nb_flags);
230 nbtd_register_name(nbtsrv, lp_netbios_name(), NBT_NAME_USER, nb_flags);
231 nbtd_register_name(nbtsrv, lp_netbios_name(), NBT_NAME_SERVER, nb_flags);
233 nb_flags |= NBT_NM_GROUP;
234 nbtd_register_name(nbtsrv, lp_workgroup(), NBT_NAME_CLIENT, nb_flags);
236 nb_flags |= NBT_NM_PERMANENT;
237 nbtd_register_name(nbtsrv, "__SAMBA__", NBT_NAME_CLIENT, nb_flags);
238 nbtd_register_name(nbtsrv, "__SAMBA__", NBT_NAME_SERVER, nb_flags);
239 nbtd_register_name(nbtsrv, "*", NBT_NAME_CLIENT, nb_flags);