source: branches/samba-3.2.x/source/nmbd/nmbd_synclists.c@ 231

Last change on this file since 231 was 133, checked in by Paul Smedley, 18 years ago

Update trunk to 3.2.0pre3
File size: 8.5 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 NBT netbios routines and daemon - version 2
4 Copyright (C) Andrew Tridgell 1994-1998
5 Copyright (C) Luke Kenneth Casson Leighton 1994-1998
6 Copyright (C) Jeremy Allison 1994-1998
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
23/* this file handles asynchronous browse synchronisation requests. The
24 requests are done by forking and putting the result in a file in the
25 locks directory. We do it this way because we don't want nmbd to be
26 blocked waiting for some server to respond on a TCP connection. This
27 also allows us to have more than 1 sync going at once (tridge) */
28
29#include "includes.h"
30
31struct sync_record {
32 struct sync_record *next, *prev;
33 unstring workgroup;
34 unstring server;
35 char *fname;
36 struct in_addr ip;
37 pid_t pid;
38};
39
40/* a linked list of current sync connections */
41static struct sync_record *syncs;
42
43static XFILE *fp;
44
45/*******************************************************************
46 This is the NetServerEnum callback.
47 Note sname and comment are in UNIX codepage format.
48 ******************************************************************/
49
50static void callback(const char *sname, uint32 stype,
51 const char *comment, void *state)
52{
53 x_fprintf(fp,"\"%s\" %08X \"%s\"\n", sname, stype, comment);
54}
55
56/*******************************************************************
57 Synchronise browse lists with another browse server.
58 Log in on the remote server's SMB port to their IPC$ service,
59 do a NetServerEnum and record the results in fname
60******************************************************************/
61
62static void sync_child(char *name, int nm_type,
63 char *workgroup,
64 struct in_addr ip, bool local, bool servers,
65 char *fname)
66{
67 fstring unix_workgroup;
68 struct cli_state *cli;
69 uint32 local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0;
70 struct nmb_name called, calling;
71 struct sockaddr_storage ss;
72 NTSTATUS status;
73
74 /* W2K DMB's return empty browse lists on port 445. Use 139.
75 * Patch from Andy Levine [email protected].
76 */
77
78 cli = cli_initialise();
79 if (!cli) {
80 return;
81 }
82
83 if (!cli_set_port(cli, 139)) {
84 cli_shutdown(cli);
85 return;
86 }
87
88 in_addr_to_sockaddr_storage(&ss, ip);
89 status = cli_connect(cli, name, &ss);
90 if (!NT_STATUS_IS_OK(status)) {
91 cli_shutdown(cli);
92 return;
93 }
94
95 make_nmb_name(&calling, get_local_machine_name(), 0x0);
96 make_nmb_name(&called , name, nm_type);
97
98 if (!cli_session_request(cli, &calling, &called)) {
99 cli_shutdown(cli);
100 return;
101 }
102
103 if (!cli_negprot(cli)) {
104 cli_shutdown(cli);
105 return;
106 }
107
108 if (!NT_STATUS_IS_OK(cli_session_setup(cli, "", "", 1, "", 0,
109 workgroup))) {
110 cli_shutdown(cli);
111 return;
112 }
113
114 if (!cli_send_tconX(cli, "IPC$", "IPC", "", 1)) {
115 cli_shutdown(cli);
116 return;
117 }
118
119 /* All the cli_XX functions take UNIX character set. */
120 fstrcpy(unix_workgroup, cli->server_domain ? cli->server_domain : workgroup);
121
122 /* Fetch a workgroup list. */
123 cli_NetServerEnum(cli, unix_workgroup,
124 local_type|SV_TYPE_DOMAIN_ENUM,
125 callback, NULL);
126
127 /* Now fetch a server list. */
128 if (servers) {
129 fstrcpy(unix_workgroup, workgroup);
130 cli_NetServerEnum(cli, unix_workgroup,
131 local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL,
132 callback, NULL);
133 }
134
135 cli_shutdown(cli);
136}
137
138/*******************************************************************
139 initialise a browse sync with another browse server. Log in on the
140 remote server's SMB port to their IPC$ service, do a NetServerEnum
141 and record the results
142******************************************************************/
143
144void sync_browse_lists(struct work_record *work,
145 char *name, int nm_type,
146 struct in_addr ip, bool local, bool servers)
147{
148 struct sync_record *s;
149 static int counter;
150
151 START_PROFILE(sync_browse_lists);
152 /* Check we're not trying to sync with ourselves. This can
153 happen if we are a domain *and* a local master browser. */
154 if (ismyip_v4(ip)) {
155done:
156 END_PROFILE(sync_browse_lists);
157 return;
158 }
159
160 s = SMB_MALLOC_P(struct sync_record);
161 if (!s) goto done;
162
163 ZERO_STRUCTP(s);
164
165 unstrcpy(s->workgroup, work->work_group);
166 unstrcpy(s->server, name);
167 s->ip = ip;
168
169 if (asprintf(&s->fname, "%s/sync.%d", lp_lockdir(), counter++) < 0) {
170 SAFE_FREE(s);
171 goto done;
172 }
173 /* Safe to use as 0 means no size change. */
174 all_string_sub(s->fname,"//", "/", 0);
175
176 DLIST_ADD(syncs, s);
177
178 /* the parent forks and returns, leaving the child to do the
179 actual sync and call END_PROFILE*/
180 CatchChild();
181 if ((s->pid = sys_fork())) return;
182
183 BlockSignals( False, SIGTERM );
184
185 DEBUG(2,("Initiating browse sync for %s to %s(%s)\n",
186 work->work_group, name, inet_ntoa(ip)));
187
188 fp = x_fopen(s->fname,O_WRONLY|O_CREAT|O_TRUNC, 0644);
189 if (!fp) {
190 END_PROFILE(sync_browse_lists);
191 _exit(1);
192 }
193
194 sync_child(name, nm_type, work->work_group, ip, local, servers,
195 s->fname);
196
197 x_fclose(fp);
198 END_PROFILE(sync_browse_lists);
199 _exit(0);
200}
201
202/**********************************************************************
203 Handle one line from a completed sync file.
204 **********************************************************************/
205
206static void complete_one(struct sync_record *s,
207 char *sname, uint32 stype, char *comment)
208{
209 struct work_record *work;
210 struct server_record *servrec;
211
212 stype &= ~SV_TYPE_LOCAL_LIST_ONLY;
213
214 if (stype & SV_TYPE_DOMAIN_ENUM) {
215 /* See if we can find the workgroup on this subnet. */
216 if((work=find_workgroup_on_subnet(unicast_subnet, sname))) {
217 /* We already know about this workgroup -
218 update the ttl. */
219 update_workgroup_ttl(work,lp_max_ttl());
220 } else {
221 /* Create the workgroup on the subnet. */
222 work = create_workgroup_on_subnet(unicast_subnet,
223 sname, lp_max_ttl());
224 if (work) {
225 /* remember who the master is */
226 unstrcpy(work->local_master_browser_name, comment);
227 }
228 }
229 return;
230 }
231
232 work = find_workgroup_on_subnet(unicast_subnet, s->workgroup);
233 if (!work) {
234 DEBUG(3,("workgroup %s doesn't exist on unicast subnet?\n",
235 s->workgroup));
236 return;
237 }
238
239 if ((servrec = find_server_in_workgroup( work, sname))) {
240 /* Check that this is not a locally known
241 server - if so ignore the entry. */
242 if(!(servrec->serv.type & SV_TYPE_LOCAL_LIST_ONLY)) {
243 /* We already know about this server - update
244 the ttl. */
245 update_server_ttl(servrec, lp_max_ttl());
246 /* Update the type. */
247 servrec->serv.type = stype;
248 }
249 return;
250 }
251
252 /* Create the server in the workgroup. */
253 create_server_on_workgroup(work, sname,stype, lp_max_ttl(), comment);
254}
255
256/**********************************************************************
257 Read the completed sync info.
258**********************************************************************/
259
260static void complete_sync(struct sync_record *s)
261{
262 XFILE *f;
263 char *server;
264 char *type_str;
265 unsigned type;
266 char *comment;
267 char line[1024];
268 const char *ptr;
269 int count=0;
270
271 f = x_fopen(s->fname,O_RDONLY, 0);
272
273 if (!f)
274 return;
275
276 while (!x_feof(f)) {
277 TALLOC_CTX *frame = NULL;
278
279 if (!fgets_slash(line,sizeof(line),f))
280 continue;
281
282 ptr = line;
283
284 frame = talloc_stackframe();
285 if (!next_token_talloc(frame,&ptr,&server,NULL) ||
286 !next_token_talloc(frame,&ptr,&type_str,NULL) ||
287 !next_token_talloc(frame,&ptr,&comment,NULL)) {
288 TALLOC_FREE(frame);
289 continue;
290 }
291
292 sscanf(type_str, "%X", &type);
293
294 complete_one(s, server, type, comment);
295
296 count++;
297 TALLOC_FREE(frame);
298 }
299 x_fclose(f);
300
301 unlink(s->fname);
302
303 DEBUG(2,("sync with %s(%s) for workgroup %s completed (%d records)\n",
304 s->server, inet_ntoa(s->ip), s->workgroup, count));
305}
306
307/**********************************************************************
308 Check for completion of any of the child processes.
309**********************************************************************/
310
311void sync_check_completion(void)
312{
313 struct sync_record *s, *next;
314
315 for (s=syncs;s;s=next) {
316 next = s->next;
317 if (!process_exists_by_pid(s->pid)) {
318 /* it has completed - grab the info */
319 complete_sync(s);
320 DLIST_REMOVE(syncs, s);
321 SAFE_FREE(s->fname);
322 SAFE_FREE(s);
323 }
324 }
325}
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