Line data Source code
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 : #include "lib/util/string_wrappers.h"
36 : #include "source3/lib/substitute.h"
37 :
38 : struct sync_record {
39 : struct sync_record *next, *prev;
40 : unstring workgroup;
41 : unstring server;
42 : char *fname;
43 : struct in_addr ip;
44 : pid_t pid;
45 : };
46 :
47 : /* a linked list of current sync connections */
48 : static struct sync_record *syncs;
49 :
50 : static FILE *fp;
51 :
52 : /*******************************************************************
53 : This is the NetServerEnum callback.
54 : Note sname and comment are in UNIX codepage format.
55 : ******************************************************************/
56 :
57 0 : static void callback(const char *sname, uint32_t stype,
58 : const char *comment, void *state)
59 : {
60 0 : fprintf(fp,"\"%s\" %08X \"%s\"\n", sname, stype, comment);
61 0 : }
62 :
63 : /*******************************************************************
64 : Synchronise browse lists with another browse server.
65 : Log in on the remote server's SMB port to their IPC$ service,
66 : do a NetServerEnum and record the results in fname
67 : ******************************************************************/
68 :
69 0 : static void sync_child(char *name, int nm_type,
70 : char *workgroup,
71 : struct in_addr ip, bool local, bool servers,
72 : char *fname)
73 : {
74 : fstring unix_workgroup;
75 : struct cli_state *cli;
76 0 : uint32_t local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0;
77 : struct sockaddr_storage ss;
78 : NTSTATUS status;
79 :
80 : /* W2K DMB's return empty browse lists on port 445. Use 139.
81 : * Patch from Andy Levine andyl@epicrealm.com.
82 : */
83 :
84 0 : in_addr_to_sockaddr_storage(&ss, ip);
85 :
86 0 : status = cli_connect_nb(name, &ss, NBT_SMB_PORT, nm_type,
87 : get_local_machine_name(), SMB_SIGNING_DEFAULT,
88 : 0, &cli);
89 0 : if (!NT_STATUS_IS_OK(status)) {
90 0 : return;
91 : }
92 :
93 0 : status = smbXcli_negprot(cli->conn,
94 0 : cli->timeout,
95 : PROTOCOL_CORE,
96 : PROTOCOL_NT1,
97 : NULL,
98 : NULL,
99 : NULL);
100 0 : if (!NT_STATUS_IS_OK(status)) {
101 0 : cli_shutdown(cli);
102 0 : return;
103 : }
104 :
105 0 : status = cli_session_setup_anon(cli);
106 0 : if (!NT_STATUS_IS_OK(status)) {
107 0 : cli_shutdown(cli);
108 0 : return;
109 : }
110 :
111 0 : if (!NT_STATUS_IS_OK(cli_tree_connect(cli, "IPC$", "IPC", NULL))) {
112 0 : cli_shutdown(cli);
113 0 : return;
114 : }
115 :
116 : /* All the cli_XX functions take UNIX character set. */
117 0 : fstrcpy(unix_workgroup, cli->server_domain ? cli->server_domain : workgroup);
118 :
119 : /* Fetch a workgroup list. */
120 0 : cli_NetServerEnum(cli, unix_workgroup,
121 : local_type|SV_TYPE_DOMAIN_ENUM,
122 : callback, NULL);
123 :
124 : /* Now fetch a server list. */
125 0 : if (servers) {
126 0 : fstrcpy(unix_workgroup, workgroup);
127 0 : cli_NetServerEnum(cli, unix_workgroup,
128 : local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL,
129 : callback, NULL);
130 : }
131 :
132 0 : cli_shutdown(cli);
133 : }
134 :
135 : /*******************************************************************
136 : initialise a browse sync with another browse server. Log in on the
137 : remote server's SMB port to their IPC$ service, do a NetServerEnum
138 : and record the results
139 : ******************************************************************/
140 :
141 0 : void sync_browse_lists(struct work_record *work,
142 : char *name, int nm_type,
143 : struct in_addr ip, bool local, bool servers)
144 : {
145 : struct sync_record *s;
146 : static int counter;
147 : int fd;
148 :
149 : /* Check we're not trying to sync with ourselves. This can
150 : happen if we are a domain *and* a local master browser. */
151 0 : if (ismyip_v4(ip)) {
152 0 : done:
153 0 : return;
154 : }
155 :
156 0 : s = SMB_MALLOC_P(struct sync_record);
157 0 : if (!s) goto done;
158 :
159 0 : ZERO_STRUCTP(s);
160 :
161 0 : unstrcpy(s->workgroup, work->work_group);
162 0 : unstrcpy(s->server, name);
163 0 : s->ip = ip;
164 :
165 0 : if (asprintf(&s->fname, "%s/sync.%d", lp_lock_directory(), counter++) < 0) {
166 0 : SAFE_FREE(s);
167 0 : goto done;
168 : }
169 : /* Safe to use as 0 means no size change. */
170 0 : all_string_sub(s->fname,"//", "/", 0);
171 :
172 0 : DLIST_ADD(syncs, s);
173 :
174 : /* the parent forks and returns, leaving the child to do the
175 : actual sync */
176 0 : CatchChild();
177 0 : if ((s->pid = fork())) return;
178 :
179 0 : BlockSignals( False, SIGTERM );
180 :
181 0 : DEBUG(2,("Initiating browse sync for %s to %s(%s)\n",
182 : work->work_group, name, inet_ntoa(ip)));
183 :
184 0 : fd = open(s->fname, O_WRONLY|O_CREAT|O_TRUNC, 0644);
185 0 : if (fd == -1) {
186 0 : _exit(1);
187 : }
188 :
189 0 : fp = fdopen(fd, "w");
190 0 : if (!fp) {
191 0 : _exit(1);
192 : }
193 0 : fd = -1;
194 :
195 0 : sync_child(name, nm_type, work->work_group, ip, local, servers,
196 : s->fname);
197 :
198 0 : fclose(fp);
199 0 : _exit(0);
200 : }
201 :
202 : /**********************************************************************
203 : Handle one line from a completed sync file.
204 : **********************************************************************/
205 :
206 0 : static void complete_one(struct sync_record *s,
207 : char *sname, uint32_t stype, char *comment)
208 : {
209 : struct work_record *work;
210 : struct server_record *servrec;
211 :
212 0 : stype &= ~SV_TYPE_LOCAL_LIST_ONLY;
213 :
214 0 : if (stype & SV_TYPE_DOMAIN_ENUM) {
215 : /* See if we can find the workgroup on this subnet. */
216 0 : if((work=find_workgroup_on_subnet(unicast_subnet, sname))) {
217 : /* We already know about this workgroup -
218 : update the ttl. */
219 0 : update_workgroup_ttl(work,lp_max_ttl());
220 : } else {
221 : /* Create the workgroup on the subnet. */
222 0 : work = create_workgroup_on_subnet(unicast_subnet,
223 : sname, lp_max_ttl());
224 0 : if (work) {
225 : /* remember who the master is */
226 0 : unstrcpy(work->local_master_browser_name, comment);
227 : }
228 : }
229 0 : return;
230 : }
231 :
232 0 : work = find_workgroup_on_subnet(unicast_subnet, s->workgroup);
233 0 : if (!work) {
234 0 : DEBUG(3,("workgroup %s doesn't exist on unicast subnet?\n",
235 : s->workgroup));
236 0 : return;
237 : }
238 :
239 0 : 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 0 : if(!(servrec->serv.type & SV_TYPE_LOCAL_LIST_ONLY)) {
243 : /* We already know about this server - update
244 : the ttl. */
245 0 : update_server_ttl(servrec, lp_max_ttl());
246 : /* Update the type. */
247 0 : servrec->serv.type = stype;
248 : }
249 0 : return;
250 : }
251 :
252 : /* Create the server in the workgroup. */
253 0 : create_server_on_workgroup(work, sname,stype, lp_max_ttl(), comment);
254 : }
255 :
256 : /**********************************************************************
257 : Read the completed sync info.
258 : **********************************************************************/
259 :
260 0 : static void complete_sync(struct sync_record *s)
261 : {
262 : FILE *f;
263 : char *server;
264 : char *type_str;
265 : unsigned type;
266 : char *comment;
267 : char line[1024];
268 : const char *ptr;
269 0 : int count=0;
270 :
271 0 : f = fopen(s->fname, "r");
272 :
273 0 : if (!f)
274 0 : return;
275 :
276 0 : while (!feof(f)) {
277 0 : TALLOC_CTX *frame = NULL;
278 :
279 0 : if (!fgets_slash(NULL, line, sizeof(line), f))
280 0 : continue;
281 :
282 0 : ptr = line;
283 :
284 0 : frame = talloc_stackframe();
285 0 : if (!next_token_talloc(frame,&ptr,&server,NULL) ||
286 0 : !next_token_talloc(frame,&ptr,&type_str,NULL) ||
287 0 : !next_token_talloc(frame,&ptr,&comment,NULL)) {
288 0 : TALLOC_FREE(frame);
289 0 : continue;
290 : }
291 :
292 0 : sscanf(type_str, "%X", &type);
293 :
294 0 : complete_one(s, server, type, comment);
295 :
296 0 : count++;
297 0 : TALLOC_FREE(frame);
298 : }
299 0 : fclose(f);
300 :
301 0 : unlink(s->fname);
302 :
303 0 : 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 :
311 17196 : void sync_check_completion(void)
312 : {
313 : struct sync_record *s, *next;
314 :
315 17196 : for (s=syncs;s;s=next) {
316 0 : next = s->next;
317 0 : if (!process_exists_by_pid(s->pid)) {
318 : /* it has completed - grab the info */
319 0 : complete_sync(s);
320 0 : DLIST_REMOVE(syncs, s);
321 0 : SAFE_FREE(s->fname);
322 0 : SAFE_FREE(s);
323 : }
324 : }
325 17196 : }
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