The big character set handling changeover!
[samba.git] / source3 / nmbd / nmbd_synclists.c
1 /* 
2    Unix SMB/Netbios implementation.
3    Version 1.9.
4    NBT netbios routines and daemon - version 2
5    Copyright (C) Andrew Tridgell 1994-1998
6    Copyright (C) Luke Kenneth Casson Leighton 1994-1998
7    Copyright (C) Jeremy Allison 1994-1998
8    
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 2 of the License, or
12    (at your option) any later version.
13    
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.
18    
19    You should have received a copy of the GNU General Public License
20    along with this program; if not, write to the Free Software
21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22    
23 */
24
25 /* this file handles asynchronous browse synchronisation requests. The
26    requests are done by forking and putting the result in a file in the
27    locks directory. We do it this way because we don't want nmbd to be
28    blocked waiting for some server to respond on a TCP connection. This
29    also allows us to have more than 1 sync going at once (tridge) */
30
31 #include "includes.h"
32 #include "smb.h"
33
34 extern int DEBUGLEVEL;
35
36 struct sync_record {
37         struct sync_record *next, *prev;
38         fstring workgroup;
39         fstring server;
40         pstring 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 FILE *fp;
49
50 /*******************************************************************
51   This is the NetServerEnum callback.
52   Note sname and comment are in UNIX codepage format.
53   ******************************************************************/
54 static void callback(const char *sname, uint32 stype, 
55                      const char *comment, void *state)
56 {
57         fprintf(fp,"\"%s\" %08X \"%s\"\n", sname, stype, comment);
58 }
59
60 /*******************************************************************
61   Synchronise browse lists with another browse server.
62   Log in on the remote server's SMB port to their IPC$ service,
63   do a NetServerEnum and record the results in fname
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         extern fstring local_machine;
71         fstring unix_workgroup;
72         static struct cli_state cli;
73         uint32 local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0;
74         struct nmb_name called, calling;
75
76         if (!cli_initialise(&cli) || !cli_connect(&cli, name, &ip)) {
77                 return;
78         }
79
80         make_nmb_name(&calling, local_machine, 0x0);
81         make_nmb_name(&called , name         , nm_type);
82
83         if (!cli_session_request(&cli, &calling, &called))
84         {
85                 cli_shutdown(&cli);
86                 return;
87         }
88
89         if (!cli_negprot(&cli)) {
90                 cli_shutdown(&cli);
91                 return;
92         }
93
94         if (!cli_session_setup(&cli, "", "", 1, "", 0, workgroup)) {
95                 cli_shutdown(&cli);
96                 return;
97         }
98
99         if (!cli_send_tconX(&cli, "IPC$", "IPC", "", 1)) {
100                 cli_shutdown(&cli);
101                 return;
102         }
103
104         /* All the cli_XX functions take UNIX character set. */
105         fstrcpy(unix_workgroup, cli.server_domain?cli.server_domain:workgroup);
106
107         /* Fetch a workgroup list. */
108         cli_NetServerEnum(&cli, unix_workgroup,
109                           local_type|SV_TYPE_DOMAIN_ENUM, 
110                           callback, NULL);
111         
112         /* Now fetch a server list. */
113         if (servers) {
114                 fstrcpy(unix_workgroup, workgroup);
115                 cli_NetServerEnum(&cli, unix_workgroup, 
116                                   local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL,
117                                   callback, NULL);
118         }
119         
120         cli_shutdown(&cli);
121 }
122
123
124 /*******************************************************************
125   initialise a browse sync with another browse server.  Log in on the
126   remote server's SMB port to their IPC$ service, do a NetServerEnum
127   and record the results
128 ******************************************************************/
129 void sync_browse_lists(struct work_record *work,
130                        char *name, int nm_type, 
131                        struct in_addr ip, BOOL local, BOOL servers)
132 {
133         struct sync_record *s;
134         static int counter;
135
136         /* Check we're not trying to sync with ourselves. This can
137            happen if we are a domain *and* a local master browser. */
138         if (ismyip(ip)) {
139                 return;
140         }
141
142         s = (struct sync_record *)malloc(sizeof(*s));
143         if (!s) return;
144
145         ZERO_STRUCTP(s);
146         
147         fstrcpy(s->workgroup, work->work_group);
148         fstrcpy(s->server, name);
149         s->ip = ip;
150
151         slprintf(s->fname, sizeof(pstring)-1,
152                  "%s/sync.%d", lp_lockdir(), counter++);
153         all_string_sub(s->fname,"//", "/", 0);
154         
155         DLIST_ADD(syncs, s);
156
157         /* the parent forks and returns, leaving the child to do the
158            actual sync */
159         CatchChild();
160         if ((s->pid = sys_fork())) return;
161
162         BlockSignals( False, SIGTERM );
163
164         DEBUG(2,("Initiating browse sync for %s to %s(%s)\n",
165                  work->work_group, name, inet_ntoa(ip)));
166
167         fp = sys_fopen(s->fname,"w");
168         if (!fp) _exit(1);      
169
170         sync_child(name, nm_type, work->work_group, ip, local, servers,
171                    s->fname);
172
173         fclose(fp);
174         _exit(0);
175 }
176
177 /**********************************************************************
178 handle one line from a completed sync file
179  **********************************************************************/
180 static void complete_one(struct sync_record *s, 
181                          char *sname, uint32 stype, char *comment)
182 {
183         struct work_record *work;
184         struct server_record *servrec;
185
186         stype &= ~SV_TYPE_LOCAL_LIST_ONLY;
187
188         if (stype & SV_TYPE_DOMAIN_ENUM) {
189                 /* See if we can find the workgroup on this subnet. */
190                 if((work=find_workgroup_on_subnet(unicast_subnet, sname))) {
191                         /* We already know about this workgroup -
192                            update the ttl. */
193                         update_workgroup_ttl(work,lp_max_ttl());
194                 } else {
195                         /* Create the workgroup on the subnet. */
196                         work = create_workgroup_on_subnet(unicast_subnet, 
197                                                           sname, lp_max_ttl());
198                         if (work) {
199                                 /* remember who the master is */
200                                 fstrcpy(work->local_master_browser_name, 
201                                         comment);
202                         }
203                 }
204                 return;
205         } 
206
207         work = find_workgroup_on_subnet(unicast_subnet, s->workgroup);
208         if (!work) {
209                 DEBUG(3,("workgroup %s doesn't exist on unicast subnet?\n",
210                          s->workgroup));
211                 return;
212         }
213
214         if ((servrec = find_server_in_workgroup( work, sname))) {
215                 /* Check that this is not a locally known
216                    server - if so ignore the entry. */
217                 if(!(servrec->serv.type & SV_TYPE_LOCAL_LIST_ONLY)) {
218                         /* We already know about this server - update
219                            the ttl. */
220                         update_server_ttl(servrec, lp_max_ttl());
221                         /* Update the type. */
222                         servrec->serv.type = stype;
223                 }
224                 return;
225         } 
226
227         /* Create the server in the workgroup. */ 
228         create_server_on_workgroup(work, sname,stype, lp_max_ttl(), comment);
229 }
230                 
231
232 /**********************************************************************
233 read the completed sync info
234  **********************************************************************/
235 static void complete_sync(struct sync_record *s)
236 {
237         FILE *f;
238         fstring server, type_str;
239         unsigned type;
240         pstring comment;
241         pstring line;
242         char *ptr;
243         int count=0;
244
245         f = sys_fopen(s->fname,"r");
246
247         if (!f) return;
248         
249         while (!feof(f)) {
250                 
251                 if (!fgets_slash(line,sizeof(pstring),f)) continue;
252                 
253                 ptr = line;
254
255                 if (!next_token(&ptr,server,NULL,sizeof(server)) ||
256                     !next_token(&ptr,type_str,NULL, sizeof(type_str)) ||
257                     !next_token(&ptr,comment,NULL, sizeof(comment))) {
258                         continue;
259                 }
260
261                 sscanf(type_str, "%X", &type);
262
263                 complete_one(s, server, type, comment);
264
265                 count++;
266         }
267
268         fclose(f);
269
270         unlink(s->fname);
271
272         DEBUG(2,("sync with %s(%s) for workgroup %s completed (%d records)\n",
273                  s->server, inet_ntoa(s->ip), s->workgroup, count));
274 }
275
276 /**********************************************************************
277 check for completion of any of the child processes
278  **********************************************************************/
279 void sync_check_completion(void)
280 {
281         struct sync_record *s, *next;
282
283         for (s=syncs;s;s=next) {
284                 next = s->next;
285                 if (!process_exists(s->pid)) {
286                         /* it has completed - grab the info */
287                         complete_sync(s);
288                         DLIST_REMOVE(syncs, s);
289                         ZERO_STRUCTP(s);
290                         free(s);
291                 }
292         }
293 }