2 Unix SMB/CIFS implementation.
4 a composite API for finding a DC and its name
6 Copyright (C) Volker Lendecke 2005
7 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2006
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include "include/includes.h"
24 #include "lib/messaging/irpc.h"
25 #include "librpc/gen_ndr/ndr_irpc.h"
26 #include "librpc/gen_ndr/samr.h"
27 #include "libcli/composite/composite.h"
28 #include "libcli/libcli.h"
29 #include "libcli/resolve/resolve.h"
30 #include "param/param.h"
32 struct finddcs_state {
33 struct composite_context *ctx;
34 struct messaging_context *msg_ctx;
36 const char *domain_name;
37 struct dom_sid *domain_sid;
39 struct nbtd_getdcname r;
40 struct nbt_name_status node_status;
43 struct nbt_dc_name *dcs;
46 static void finddcs_name_resolved(struct composite_context *ctx);
47 static void finddcs_getdc_replied(struct irpc_request *ireq);
48 static void fallback_node_status(struct finddcs_state *state);
49 static void fallback_node_status_replied(struct nbt_name_request *name_req);
52 * Setup and send off the a normal name resolution for the target name.
54 * The domain_sid parameter is optional, and is used in the subsequent getdc request.
56 * This will try a GetDC request, but this may not work. It will try
57 * a node status as a fallback, then return no name (but still include
61 struct composite_context *finddcs_send(TALLOC_CTX *mem_ctx,
62 const char *domain_name,
64 struct dom_sid *domain_sid,
66 struct event_context *event_ctx,
67 struct messaging_context *msg_ctx)
69 struct composite_context *c, *creq;
70 struct finddcs_state *state;
73 c = composite_create(mem_ctx, event_ctx);
74 if (c == NULL) return NULL;
76 state = talloc(c, struct finddcs_state);
77 if (composite_nomem(state, c)) return c;
78 c->private_data = state;
82 state->domain_name = talloc_strdup(state, domain_name);
83 if (composite_nomem(state->domain_name, c)) return c;
86 state->domain_sid = talloc_reference(state, domain_sid);
87 if (composite_nomem(state->domain_sid, c)) return c;
89 state->domain_sid = NULL;
92 state->msg_ctx = msg_ctx;
94 make_nbt_name(&name, state->domain_name, name_type);
95 creq = resolve_name_send(&name, event_ctx,
97 composite_continue(c, creq, finddcs_name_resolved, state);
101 /* Having got an name query answer, fire off a GetDC request, so we
102 * can find the target's all-important name. (Kerberos and some
103 * netlogon operations are quite picky about names)
105 * The name is a courtesy, if we don't find it, don't completely fail.
107 * However, if the nbt server is down, fall back to a node status
110 static void finddcs_name_resolved(struct composite_context *ctx)
112 struct finddcs_state *state =
113 talloc_get_type(ctx->async.private_data, struct finddcs_state);
114 struct irpc_request *ireq;
115 struct server_id *nbt_servers;
118 state->ctx->status = resolve_name_recv(ctx, state, &address);
119 if (!composite_is_ok(state->ctx)) return;
121 /* TODO: This should try and find all the DCs, and give the
122 * caller them in the order they responded */
125 state->dcs = talloc_array(state, struct nbt_dc_name, state->num_dcs);
126 if (composite_nomem(state->dcs, state->ctx)) return;
128 state->dcs[0].address = talloc_steal(state->dcs, address);
130 /* Try and find the nbt server. Fallback to a node status
131 * request if we can't make this happen The nbt server just
132 * might not be running, or we may not have a messaging
133 * context (not root etc) */
134 if (!state->msg_ctx) {
135 fallback_node_status(state);
139 nbt_servers = irpc_servers_byname(state->msg_ctx, state, "nbt_server");
140 if ((nbt_servers == NULL) || (nbt_servers[0].id == 0)) {
141 fallback_node_status(state);
145 state->r.in.domainname = state->domain_name;
146 state->r.in.ip_address = state->dcs[0].address;
147 state->r.in.my_computername = lp_netbios_name();
148 state->r.in.my_accountname = talloc_asprintf(state, "%s$",
150 if (composite_nomem(state->r.in.my_accountname, state->ctx)) return;
151 state->r.in.account_control = ACB_WSTRUST;
152 state->r.in.domain_sid = state->domain_sid;
154 ireq = irpc_call_send(state->msg_ctx, nbt_servers[0],
155 &ndr_table_irpc, NDR_NBTD_GETDCNAME,
158 fallback_node_status(state);
162 composite_continue_irpc(state->ctx, ireq, finddcs_getdc_replied, state);
165 /* Called when the GetDC request returns */
166 static void finddcs_getdc_replied(struct irpc_request *ireq)
168 struct finddcs_state *state =
169 talloc_get_type(ireq->async.private, struct finddcs_state);
171 state->ctx->status = irpc_call_recv(ireq);
172 if (!composite_is_ok(state->ctx)) return;
174 state->dcs[0].name = talloc_steal(state->dcs, state->r.out.dcname);
175 composite_done(state->ctx);
178 /* The GetDC request might not be availible (such as occours when the
179 * NBT server is down). Fallback to a node status. It is the best
181 static void fallback_node_status(struct finddcs_state *state)
183 struct nbt_name_socket *nbtsock;
184 struct nbt_name_request *name_req;
186 state->node_status.in.name.name = "*";
187 state->node_status.in.name.type = NBT_NAME_CLIENT;
188 state->node_status.in.name.scope = NULL;
189 state->node_status.in.dest_addr = state->dcs[0].address;
190 state->node_status.in.timeout = 1;
191 state->node_status.in.retries = 2;
193 nbtsock = nbt_name_socket_init(state, state->ctx->event_ctx);
194 if (composite_nomem(nbtsock, state->ctx)) return;
196 name_req = nbt_name_status_send(nbtsock, &state->node_status);
197 if (composite_nomem(name_req, state->ctx)) return;
199 composite_continue_nbt(state->ctx,
201 fallback_node_status_replied,
205 /* We have a node status reply (or perhaps a timeout) */
206 static void fallback_node_status_replied(struct nbt_name_request *name_req)
209 struct finddcs_state *state = talloc_get_type(name_req->async.private, struct finddcs_state);
210 state->ctx->status = nbt_name_status_recv(name_req, state, &state->node_status);
211 if (!composite_is_ok(state->ctx)) return;
213 for (i=0; i < state->node_status.out.status.num_names; i++) {
215 if (state->node_status.out.status.names[i].type == NBT_NAME_SERVER) {
216 char *name = talloc_strndup(state->dcs, state->node_status.out.status.names[0].name, 15);
217 /* Strip space padding */
219 j = MIN(strlen(name), 15);
220 for (; j > 0 && name[j - 1] == ' '; j--) {
224 state->dcs[0].name = name;
225 composite_done(state->ctx);
229 composite_error(state->ctx, NT_STATUS_NO_LOGON_SERVERS);
232 NTSTATUS finddcs_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
233 int *num_dcs, struct nbt_dc_name **dcs)
235 NTSTATUS status = composite_wait(c);
236 if (NT_STATUS_IS_OK(status)) {
237 struct finddcs_state *state =
238 talloc_get_type(c->private_data, struct finddcs_state);
239 *num_dcs = state->num_dcs;
240 *dcs = talloc_steal(mem_ctx, state->dcs);
246 NTSTATUS finddcs(TALLOC_CTX *mem_ctx,
247 const char *domain_name, int name_type,
248 struct dom_sid *domain_sid,
249 const char **methods,
250 struct event_context *event_ctx,
251 struct messaging_context *msg_ctx,
252 int *num_dcs, struct nbt_dc_name **dcs)
254 struct composite_context *c = finddcs_send(mem_ctx,
255 domain_name, name_type,
258 return finddcs_recv(c, mem_ctx, num_dcs, dcs);