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 "libcli/finddcs.h"
31 #include "param/param.h"
33 struct finddcs_state {
34 struct composite_context *ctx;
35 struct messaging_context *msg_ctx;
37 const char *domain_name;
38 struct dom_sid *domain_sid;
40 struct nbtd_getdcname r;
41 struct nbt_name_status node_status;
44 struct nbt_dc_name *dcs;
47 static void finddcs_name_resolved(struct composite_context *ctx);
48 static void finddcs_getdc_replied(struct irpc_request *ireq);
49 static void fallback_node_status(struct finddcs_state *state);
50 static void fallback_node_status_replied(struct nbt_name_request *name_req);
53 * Setup and send off the a normal name resolution for the target name.
55 * The domain_sid parameter is optional, and is used in the subsequent getdc request.
57 * This will try a GetDC request, but this may not work. It will try
58 * a node status as a fallback, then return no name (but still include
62 struct composite_context *finddcs_send(TALLOC_CTX *mem_ctx,
63 const char *domain_name,
65 struct dom_sid *domain_sid,
67 struct event_context *event_ctx,
68 struct messaging_context *msg_ctx)
70 struct composite_context *c, *creq;
71 struct finddcs_state *state;
74 c = composite_create(mem_ctx, event_ctx);
75 if (c == NULL) return NULL;
77 state = talloc(c, struct finddcs_state);
78 if (composite_nomem(state, c)) return c;
79 c->private_data = state;
83 state->domain_name = talloc_strdup(state, domain_name);
84 if (composite_nomem(state->domain_name, c)) return c;
87 state->domain_sid = talloc_reference(state, domain_sid);
88 if (composite_nomem(state->domain_sid, c)) return c;
90 state->domain_sid = NULL;
93 state->msg_ctx = msg_ctx;
95 make_nbt_name(&name, state->domain_name, name_type);
96 creq = resolve_name_send(&name, event_ctx,
98 composite_continue(c, creq, finddcs_name_resolved, state);
102 /* Having got an name query answer, fire off a GetDC request, so we
103 * can find the target's all-important name. (Kerberos and some
104 * netlogon operations are quite picky about names)
106 * The name is a courtesy, if we don't find it, don't completely fail.
108 * However, if the nbt server is down, fall back to a node status
111 static void finddcs_name_resolved(struct composite_context *ctx)
113 struct finddcs_state *state =
114 talloc_get_type(ctx->async.private_data, struct finddcs_state);
115 struct irpc_request *ireq;
116 struct server_id *nbt_servers;
119 state->ctx->status = resolve_name_recv(ctx, state, &address);
120 if (!composite_is_ok(state->ctx)) return;
122 /* TODO: This should try and find all the DCs, and give the
123 * caller them in the order they responded */
126 state->dcs = talloc_array(state, struct nbt_dc_name, state->num_dcs);
127 if (composite_nomem(state->dcs, state->ctx)) return;
129 state->dcs[0].address = talloc_steal(state->dcs, address);
131 /* Try and find the nbt server. Fallback to a node status
132 * request if we can't make this happen The nbt server just
133 * might not be running, or we may not have a messaging
134 * context (not root etc) */
135 if (!state->msg_ctx) {
136 fallback_node_status(state);
140 nbt_servers = irpc_servers_byname(state->msg_ctx, state, "nbt_server");
141 if ((nbt_servers == NULL) || (nbt_servers[0].id == 0)) {
142 fallback_node_status(state);
146 state->r.in.domainname = state->domain_name;
147 state->r.in.ip_address = state->dcs[0].address;
148 state->r.in.my_computername = lp_netbios_name(global_loadparm);
149 state->r.in.my_accountname = talloc_asprintf(state, "%s$",
150 lp_netbios_name(global_loadparm));
151 if (composite_nomem(state->r.in.my_accountname, state->ctx)) return;
152 state->r.in.account_control = ACB_WSTRUST;
153 state->r.in.domain_sid = state->domain_sid;
155 ireq = irpc_call_send(state->msg_ctx, nbt_servers[0],
156 &ndr_table_irpc, NDR_NBTD_GETDCNAME,
159 fallback_node_status(state);
163 composite_continue_irpc(state->ctx, ireq, finddcs_getdc_replied, state);
166 /* Called when the GetDC request returns */
167 static void finddcs_getdc_replied(struct irpc_request *ireq)
169 struct finddcs_state *state =
170 talloc_get_type(ireq->async.private, struct finddcs_state);
172 state->ctx->status = irpc_call_recv(ireq);
173 if (!composite_is_ok(state->ctx)) return;
175 state->dcs[0].name = talloc_steal(state->dcs, state->r.out.dcname);
176 composite_done(state->ctx);
179 /* The GetDC request might not be availible (such as occours when the
180 * NBT server is down). Fallback to a node status. It is the best
182 static void fallback_node_status(struct finddcs_state *state)
184 struct nbt_name_socket *nbtsock;
185 struct nbt_name_request *name_req;
187 state->node_status.in.name.name = "*";
188 state->node_status.in.name.type = NBT_NAME_CLIENT;
189 state->node_status.in.name.scope = NULL;
190 state->node_status.in.dest_addr = state->dcs[0].address;
191 state->node_status.in.timeout = 1;
192 state->node_status.in.retries = 2;
194 nbtsock = nbt_name_socket_init(state, state->ctx->event_ctx);
195 if (composite_nomem(nbtsock, state->ctx)) return;
197 name_req = nbt_name_status_send(nbtsock, &state->node_status);
198 if (composite_nomem(name_req, state->ctx)) return;
200 composite_continue_nbt(state->ctx,
202 fallback_node_status_replied,
206 /* We have a node status reply (or perhaps a timeout) */
207 static void fallback_node_status_replied(struct nbt_name_request *name_req)
210 struct finddcs_state *state = talloc_get_type(name_req->async.private, struct finddcs_state);
211 state->ctx->status = nbt_name_status_recv(name_req, state, &state->node_status);
212 if (!composite_is_ok(state->ctx)) return;
214 for (i=0; i < state->node_status.out.status.num_names; i++) {
216 if (state->node_status.out.status.names[i].type == NBT_NAME_SERVER) {
217 char *name = talloc_strndup(state->dcs, state->node_status.out.status.names[0].name, 15);
218 /* Strip space padding */
220 j = MIN(strlen(name), 15);
221 for (; j > 0 && name[j - 1] == ' '; j--) {
225 state->dcs[0].name = name;
226 composite_done(state->ctx);
230 composite_error(state->ctx, NT_STATUS_NO_LOGON_SERVERS);
233 NTSTATUS finddcs_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
234 int *num_dcs, struct nbt_dc_name **dcs)
236 NTSTATUS status = composite_wait(c);
237 if (NT_STATUS_IS_OK(status)) {
238 struct finddcs_state *state =
239 talloc_get_type(c->private_data, struct finddcs_state);
240 *num_dcs = state->num_dcs;
241 *dcs = talloc_steal(mem_ctx, state->dcs);
247 NTSTATUS finddcs(TALLOC_CTX *mem_ctx,
248 const char *domain_name, int name_type,
249 struct dom_sid *domain_sid,
250 const char **methods,
251 struct event_context *event_ctx,
252 struct messaging_context *msg_ctx,
253 int *num_dcs, struct nbt_dc_name **dcs)
255 struct composite_context *c = finddcs_send(mem_ctx,
256 domain_name, name_type,
259 return finddcs_recv(c, mem_ctx, num_dcs, dcs);