f3e524d932a292a7d697d0170266cd75869154ec
[samba.git] / source3 / nmbd / nmbd_synclists.c
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 /* this file handles asynchronous browse synchronisation requests. The
23    requests are done by forking and putting the result in a file in the
24    locks directory. We do it this way because we don't want nmbd to be
25    blocked waiting for some server to respond on a TCP connection. This
26    also allows us to have more than 1 sync going at once (tridge) */
27
28 #include "includes.h"
29 #include "system/filesys.h"
30 #include "../librpc/gen_ndr/svcctl.h"
31 #include "nmbd/nmbd.h"
32 #include "libsmb/libsmb.h"
33 #include "libsmb/clirap.h"
34 #include "../libcli/smb/smbXcli_base.h"
35
36 struct sync_record {
37         struct sync_record *next, *prev;
38         unstring workgroup;
39         unstring server;
40         char *fname;
41         struct in_addr ip;
42         pid_t pid;
43 };
44
45 /* a linked list of current sync connections */
46 static struct sync_record *syncs;
47
48 static XFILE *fp;
49
50 /*******************************************************************
51   This is the NetServerEnum callback.
52   Note sname and comment are in UNIX codepage format.
53   ******************************************************************/
54
55 static void callback(const char *sname, uint32_t stype,
56                      const char *comment, void *state)
57 {
58         x_fprintf(fp,"\"%s\" %08X \"%s\"\n", sname, stype, comment);
59 }
60
61 /*******************************************************************
62   Synchronise browse lists with another browse server.
63   Log in on the remote server's SMB port to their IPC$ service,
64   do a NetServerEnum and record the results in fname
65 ******************************************************************/
66
67 static void sync_child(char *name, int nm_type, 
68                        char *workgroup,
69                        struct in_addr ip, bool local, bool servers,
70                        char *fname)
71 {
72         fstring unix_workgroup;
73         struct cli_state *cli;
74         uint32_t local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0;
75         struct sockaddr_storage ss;
76         NTSTATUS status;
77
78         /* W2K DMB's return empty browse lists on port 445. Use 139.
79          * Patch from Andy Levine andyl@epicrealm.com.
80          */
81
82         in_addr_to_sockaddr_storage(&ss, ip);
83
84         status = cli_connect_nb(name, &ss, NBT_SMB_PORT, nm_type,
85                                 get_local_machine_name(), SMB_SIGNING_DEFAULT,
86                                 0, &cli);
87         if (!NT_STATUS_IS_OK(status)) {
88                 return;
89         }
90
91         status = smbXcli_negprot(cli->conn, cli->timeout, PROTOCOL_CORE,
92                                  PROTOCOL_NT1);
93         if (!NT_STATUS_IS_OK(status)) {
94                 cli_shutdown(cli);
95                 return;
96         }
97
98         status = cli_session_setup_anon(cli);
99         if (!NT_STATUS_IS_OK(status)) {
100                 cli_shutdown(cli);
101                 return;
102         }
103
104         if (!NT_STATUS_IS_OK(cli_tree_connect(cli, "IPC$", "IPC", "", 1))) {
105                 cli_shutdown(cli);
106                 return;
107         }
108
109         /* All the cli_XX functions take UNIX character set. */
110         fstrcpy(unix_workgroup, cli->server_domain ? cli->server_domain : workgroup);
111
112         /* Fetch a workgroup list. */
113         cli_NetServerEnum(cli, unix_workgroup,
114                           local_type|SV_TYPE_DOMAIN_ENUM, 
115                           callback, NULL);
116
117         /* Now fetch a server list. */
118         if (servers) {
119                 fstrcpy(unix_workgroup, workgroup);
120                 cli_NetServerEnum(cli, unix_workgroup, 
121                                   local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL,
122                                   callback, NULL);
123         }
124
125         cli_shutdown(cli);
126 }
127
128 /*******************************************************************
129   initialise a browse sync with another browse server.  Log in on the
130   remote server's SMB port to their IPC$ service, do a NetServerEnum
131   and record the results
132 ******************************************************************/
133
134 void sync_browse_lists(struct work_record *work,
135                        char *name, int nm_type, 
136                        struct in_addr ip, bool local, bool servers)
137 {
138         struct sync_record *s;
139         static int counter;
140
141         /* Check we're not trying to sync with ourselves. This can
142            happen if we are a domain *and* a local master browser. */
143         if (ismyip_v4(ip)) {
144 done:
145                 return;
146         }
147
148         s = SMB_MALLOC_P(struct sync_record);
149         if (!s) goto done;
150
151         ZERO_STRUCTP(s);
152
153         unstrcpy(s->workgroup, work->work_group);
154         unstrcpy(s->server, name);
155         s->ip = ip;
156
157         if (asprintf(&s->fname, "%s/sync.%d", lp_lock_directory(), counter++) < 0) {
158                 SAFE_FREE(s);
159                 goto done;
160         }
161         /* Safe to use as 0 means no size change. */
162         all_string_sub(s->fname,"//", "/", 0);
163
164         DLIST_ADD(syncs, s);
165
166         /* the parent forks and returns, leaving the child to do the
167            actual sync */
168         CatchChild();
169         if ((s->pid = fork())) return;
170
171         BlockSignals( False, SIGTERM );
172
173         DEBUG(2,("Initiating browse sync for %s to %s(%s)\n",
174                  work->work_group, name, inet_ntoa(ip)));
175
176         fp = x_fopen(s->fname,O_WRONLY|O_CREAT|O_TRUNC, 0644);
177         if (!fp) {
178                 _exit(1);
179         }
180
181         sync_child(name, nm_type, work->work_group, ip, local, servers,
182                    s->fname);
183
184         x_fclose(fp);
185         _exit(0);
186 }
187
188 /**********************************************************************
189  Handle one line from a completed sync file.
190  **********************************************************************/
191
192 static void complete_one(struct sync_record *s,
193                          char *sname, uint32_t stype, char *comment)
194 {
195         struct work_record *work;
196         struct server_record *servrec;
197
198         stype &= ~SV_TYPE_LOCAL_LIST_ONLY;
199
200         if (stype & SV_TYPE_DOMAIN_ENUM) {
201                 /* See if we can find the workgroup on this subnet. */
202                 if((work=find_workgroup_on_subnet(unicast_subnet, sname))) {
203                         /* We already know about this workgroup -
204                            update the ttl. */
205                         update_workgroup_ttl(work,lp_max_ttl());
206                 } else {
207                         /* Create the workgroup on the subnet. */
208                         work = create_workgroup_on_subnet(unicast_subnet, 
209                                                           sname, lp_max_ttl());
210                         if (work) {
211                                 /* remember who the master is */
212                                 unstrcpy(work->local_master_browser_name, comment);
213                         }
214                 }
215                 return;
216         } 
217
218         work = find_workgroup_on_subnet(unicast_subnet, s->workgroup);
219         if (!work) {
220                 DEBUG(3,("workgroup %s doesn't exist on unicast subnet?\n",
221                          s->workgroup));
222                 return;
223         }
224
225         if ((servrec = find_server_in_workgroup( work, sname))) {
226                 /* Check that this is not a locally known
227                    server - if so ignore the entry. */
228                 if(!(servrec->serv.type & SV_TYPE_LOCAL_LIST_ONLY)) {
229                         /* We already know about this server - update
230                            the ttl. */
231                         update_server_ttl(servrec, lp_max_ttl());
232                         /* Update the type. */
233                         servrec->serv.type = stype;
234                 }
235                 return;
236         } 
237
238         /* Create the server in the workgroup. */ 
239         create_server_on_workgroup(work, sname,stype, lp_max_ttl(), comment);
240 }
241
242 /**********************************************************************
243  Read the completed sync info.
244 **********************************************************************/
245
246 static void complete_sync(struct sync_record *s)
247 {
248         XFILE *f;
249         char *server;
250         char *type_str;
251         unsigned type;
252         char *comment;
253         char line[1024];
254         const char *ptr;
255         int count=0;
256
257         f = x_fopen(s->fname,O_RDONLY, 0);
258
259         if (!f)
260                 return;
261
262         while (!x_feof(f)) {
263                 TALLOC_CTX *frame = NULL;
264
265                 if (!fgets_slash(line,sizeof(line),f))
266                         continue;
267
268                 ptr = line;
269
270                 frame = talloc_stackframe();
271                 if (!next_token_talloc(frame,&ptr,&server,NULL) ||
272                     !next_token_talloc(frame,&ptr,&type_str,NULL) ||
273                     !next_token_talloc(frame,&ptr,&comment,NULL)) {
274                         TALLOC_FREE(frame);
275                         continue;
276                 }
277
278                 sscanf(type_str, "%X", &type);
279
280                 complete_one(s, server, type, comment);
281
282                 count++;
283                 TALLOC_FREE(frame);
284         }
285         x_fclose(f);
286
287         unlink(s->fname);
288
289         DEBUG(2,("sync with %s(%s) for workgroup %s completed (%d records)\n",
290                  s->server, inet_ntoa(s->ip), s->workgroup, count));
291 }
292
293 /**********************************************************************
294  Check for completion of any of the child processes.
295 **********************************************************************/
296
297 void sync_check_completion(void)
298 {
299         struct sync_record *s, *next;
300
301         for (s=syncs;s;s=next) {
302                 next = s->next;
303                 if (!process_exists_by_pid(s->pid)) {
304                         /* it has completed - grab the info */
305                         complete_sync(s);
306                         DLIST_REMOVE(syncs, s);
307                         SAFE_FREE(s->fname);
308                         SAFE_FREE(s);
309                 }
310         }
311 }