r16945: Sync trunk -> 3.0 for 3.0.24 code. Still need
[vlendec/samba-autobuild/.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 2 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, write to the Free Software
20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21    
22 */
23
24 /* this file handles asynchronous browse synchronisation requests. The
25    requests are done by forking and putting the result in a file in the
26    locks directory. We do it this way because we don't want nmbd to be
27    blocked waiting for some server to respond on a TCP connection. This
28    also allows us to have more than 1 sync going at once (tridge) */
29
30 #include "includes.h"
31
32 extern fstring local_machine;
33
34 struct sync_record {
35         struct sync_record *next, *prev;
36         unstring workgroup;
37         unstring server;
38         pstring fname;
39         struct in_addr ip;
40         pid_t pid;
41 };
42
43 /* a linked list of current sync connections */
44 static struct sync_record *syncs;
45
46 static XFILE *fp;
47
48 /*******************************************************************
49   This is the NetServerEnum callback.
50   Note sname and comment are in UNIX codepage format.
51   ******************************************************************/
52
53 static void callback(const char *sname, uint32 stype, 
54                      const char *comment, void *state)
55 {
56         x_fprintf(fp,"\"%s\" %08X \"%s\"\n", sname, stype, comment);
57 }
58
59 /*******************************************************************
60   Synchronise browse lists with another browse server.
61   Log in on the remote server's SMB port to their IPC$ service,
62   do a NetServerEnum and record the results in fname
63 ******************************************************************/
64
65 static void sync_child(char *name, int nm_type, 
66                        char *workgroup,
67                        struct in_addr ip, BOOL local, BOOL servers,
68                        char *fname)
69 {
70         fstring unix_workgroup;
71         struct cli_state *cli;
72         uint32 local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0;
73         struct nmb_name called, calling;
74
75         /* W2K DMB's return empty browse lists on port 445. Use 139.
76          * Patch from Andy Levine andyl@epicrealm.com.
77          */
78
79         cli = cli_initialise();
80         if (!cli) {
81                 return;
82         }
83
84         if (!cli_set_port(cli, 139) || !cli_connect(cli, name, &ip)) {
85                 return;
86         }
87
88         make_nmb_name(&calling, local_machine, 0x0);
89         make_nmb_name(&called , name, nm_type);
90
91         if (!cli_session_request(cli, &calling, &called)) {
92                 cli_shutdown(cli);
93                 return;
94         }
95
96         if (!cli_negprot(cli)) {
97                 cli_shutdown(cli);
98                 return;
99         }
100
101         if (!cli_session_setup(cli, "", "", 1, "", 0, workgroup)) {
102                 cli_shutdown(cli);
103                 return;
104         }
105
106         if (!cli_send_tconX(cli, "IPC$", "IPC", "", 1)) {
107                 cli_shutdown(cli);
108                 return;
109         }
110
111         /* All the cli_XX functions take UNIX character set. */
112         fstrcpy(unix_workgroup, cli->server_domain ? cli->server_domain : workgroup);
113
114         /* Fetch a workgroup list. */
115         cli_NetServerEnum(cli, unix_workgroup,
116                           local_type|SV_TYPE_DOMAIN_ENUM, 
117                           callback, NULL);
118         
119         /* Now fetch a server list. */
120         if (servers) {
121                 fstrcpy(unix_workgroup, workgroup);
122                 cli_NetServerEnum(cli, unix_workgroup, 
123                                   local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL,
124                                   callback, NULL);
125         }
126         
127         cli_shutdown(cli);
128 }
129
130 /*******************************************************************
131   initialise a browse sync with another browse server.  Log in on the
132   remote server's SMB port to their IPC$ service, do a NetServerEnum
133   and record the results
134 ******************************************************************/
135
136 void sync_browse_lists(struct work_record *work,
137                        char *name, int nm_type, 
138                        struct in_addr ip, BOOL local, BOOL servers)
139 {
140         struct sync_record *s;
141         static int counter;
142
143         START_PROFILE(sync_browse_lists);
144         /* Check we're not trying to sync with ourselves. This can
145            happen if we are a domain *and* a local master browser. */
146         if (ismyip(ip)) {
147 done:
148                 END_PROFILE(sync_browse_lists);
149                 return;
150         }
151
152         s = SMB_MALLOC_P(struct sync_record);
153         if (!s) goto done;
154
155         ZERO_STRUCTP(s);
156         
157         unstrcpy(s->workgroup, work->work_group);
158         unstrcpy(s->server, name);
159         s->ip = ip;
160
161         slprintf(s->fname, sizeof(pstring)-1,
162                  "%s/sync.%d", lp_lockdir(), counter++);
163         all_string_sub(s->fname,"//", "/", 0);
164         
165         DLIST_ADD(syncs, s);
166
167         /* the parent forks and returns, leaving the child to do the
168            actual sync and call END_PROFILE*/
169         CatchChild();
170         if ((s->pid = sys_fork())) return;
171
172         BlockSignals( False, SIGTERM );
173
174         DEBUG(2,("Initiating browse sync for %s to %s(%s)\n",
175                  work->work_group, name, inet_ntoa(ip)));
176
177         fp = x_fopen(s->fname,O_WRONLY|O_CREAT|O_TRUNC, 0644);
178         if (!fp) {
179                 END_PROFILE(sync_browse_lists);
180                 _exit(1);       
181         }
182
183         sync_child(name, nm_type, work->work_group, ip, local, servers,
184                    s->fname);
185
186         x_fclose(fp);
187         END_PROFILE(sync_browse_lists);
188         _exit(0);
189 }
190
191 /**********************************************************************
192  Handle one line from a completed sync file.
193  **********************************************************************/
194
195 static void complete_one(struct sync_record *s, 
196                          char *sname, uint32 stype, char *comment)
197 {
198         struct work_record *work;
199         struct server_record *servrec;
200
201         stype &= ~SV_TYPE_LOCAL_LIST_ONLY;
202
203         if (stype & SV_TYPE_DOMAIN_ENUM) {
204                 /* See if we can find the workgroup on this subnet. */
205                 if((work=find_workgroup_on_subnet(unicast_subnet, sname))) {
206                         /* We already know about this workgroup -
207                            update the ttl. */
208                         update_workgroup_ttl(work,lp_max_ttl());
209                 } else {
210                         /* Create the workgroup on the subnet. */
211                         work = create_workgroup_on_subnet(unicast_subnet, 
212                                                           sname, lp_max_ttl());
213                         if (work) {
214                                 /* remember who the master is */
215                                 unstrcpy(work->local_master_browser_name, comment);
216                         }
217                 }
218                 return;
219         } 
220
221         work = find_workgroup_on_subnet(unicast_subnet, s->workgroup);
222         if (!work) {
223                 DEBUG(3,("workgroup %s doesn't exist on unicast subnet?\n",
224                          s->workgroup));
225                 return;
226         }
227
228         if ((servrec = find_server_in_workgroup( work, sname))) {
229                 /* Check that this is not a locally known
230                    server - if so ignore the entry. */
231                 if(!(servrec->serv.type & SV_TYPE_LOCAL_LIST_ONLY)) {
232                         /* We already know about this server - update
233                            the ttl. */
234                         update_server_ttl(servrec, lp_max_ttl());
235                         /* Update the type. */
236                         servrec->serv.type = stype;
237                 }
238                 return;
239         } 
240
241         /* Create the server in the workgroup. */ 
242         create_server_on_workgroup(work, sname,stype, lp_max_ttl(), comment);
243 }
244                 
245 /**********************************************************************
246  Read the completed sync info.
247 **********************************************************************/
248
249 static void complete_sync(struct sync_record *s)
250 {
251         XFILE *f;
252         unstring server, type_str;
253         unsigned type;
254         pstring comment;
255         pstring line;
256         const char *ptr;
257         int count=0;
258
259         f = x_fopen(s->fname,O_RDONLY, 0);
260
261         if (!f)
262                 return;
263         
264         while (!x_feof(f)) {
265                 
266                 if (!fgets_slash(line,sizeof(pstring),f))
267                         continue;
268                 
269                 ptr = line;
270
271                 if (!next_token(&ptr,server,NULL,sizeof(server)) ||
272                     !next_token(&ptr,type_str,NULL, sizeof(type_str)) ||
273                     !next_token(&ptr,comment,NULL, sizeof(comment))) {
274                         continue;
275                 }
276
277                 sscanf(type_str, "%X", &type);
278
279                 complete_one(s, server, type, comment);
280
281                 count++;
282         }
283
284         x_fclose(f);
285
286         unlink(s->fname);
287
288         DEBUG(2,("sync with %s(%s) for workgroup %s completed (%d records)\n",
289                  s->server, inet_ntoa(s->ip), s->workgroup, count));
290 }
291
292 /**********************************************************************
293  Check for completion of any of the child processes.
294 **********************************************************************/
295
296 void sync_check_completion(void)
297 {
298         struct sync_record *s, *next;
299
300         for (s=syncs;s;s=next) {
301                 next = s->next;
302                 if (!process_exists_by_pid(s->pid)) {
303                         /* it has completed - grab the info */
304                         complete_sync(s);
305                         DLIST_REMOVE(syncs, s);
306                         ZERO_STRUCTP(s);
307                         SAFE_FREE(s);
308                 }
309         }
310 }