s3:winbind: Convert WINBINDD_LIST_GROUPS to the new API
[sfrench/samba-autobuild/.git] / source3 / winbindd / winbindd.c
1 /* 
2    Unix SMB/CIFS implementation.
3
4    Winbind daemon for ntdom nss module
5
6    Copyright (C) by Tim Potter 2000-2002
7    Copyright (C) Andrew Tridgell 2002
8    Copyright (C) Jelmer Vernooij 2003
9    Copyright (C) Volker Lendecke 2004
10
11    This program is free software; you can redistribute it and/or modify
12    it under the terms of the GNU General Public License as published by
13    the Free Software Foundation; either version 3 of the License, or
14    (at your option) any later version.
15
16    This program is distributed in the hope that it will be useful,
17    but WITHOUT ANY WARRANTY; without even the implied warranty of
18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19    GNU General Public License for more details.
20
21    You should have received a copy of the GNU General Public License
22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
23 */
24
25 #include "includes.h"
26 #include "winbindd.h"
27 #include "../../nsswitch/libwbclient/wbc_async.h"
28
29 #undef DBGC_CLASS
30 #define DBGC_CLASS DBGC_WINBIND
31
32 static void remove_client(struct winbindd_cli_state *state);
33
34 static bool opt_nocache = False;
35 static bool interactive = False;
36
37 extern bool override_logfile;
38
39 struct event_context *winbind_event_context(void)
40 {
41         static struct event_context *ctx;
42
43         if (!ctx && !(ctx = event_context_init(NULL))) {
44                 smb_panic("Could not init winbind event context");
45         }
46         return ctx;
47 }
48
49 struct messaging_context *winbind_messaging_context(void)
50 {
51         static struct messaging_context *ctx;
52
53         if (ctx == NULL) {
54                 ctx = messaging_init(NULL, server_id_self(),
55                                      winbind_event_context());
56         }
57         if (ctx == NULL) {
58                 DEBUG(0, ("Could not init winbind messaging context.\n"));
59         }
60         return ctx;
61 }
62
63 /* Reload configuration */
64
65 static bool reload_services_file(const char *lfile)
66 {
67         bool ret;
68
69         if (lp_loaded()) {
70                 const char *fname = lp_configfile();
71
72                 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
73                         set_dyn_CONFIGFILE(fname);
74                 }
75         }
76
77         /* if this is a child, restore the logfile to the special
78            name - <domain>, idmap, etc. */
79         if (lfile && *lfile) {
80                 lp_set_logfile(lfile);
81         }
82
83         reopen_logs();
84         ret = lp_load(get_dyn_CONFIGFILE(),False,False,True,True);
85
86         reopen_logs();
87         load_interfaces();
88
89         return(ret);
90 }
91
92
93 /**************************************************************************** **
94  Handle a fault..
95  **************************************************************************** */
96
97 static void fault_quit(void)
98 {
99         dump_core();
100 }
101
102 static void winbindd_status(void)
103 {
104         struct winbindd_cli_state *tmp;
105
106         DEBUG(0, ("winbindd status:\n"));
107
108         /* Print client state information */
109
110         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
111
112         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
113                 DEBUG(2, ("\tclient list:\n"));
114                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
115                         DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
116                                   (unsigned long)tmp->pid, tmp->sock));
117                 }
118         }
119 }
120
121 /* Print winbindd status to log file */
122
123 static void print_winbindd_status(void)
124 {
125         winbindd_status();
126 }
127
128 /* Flush client cache */
129
130 static void flush_caches(void)
131 {
132         /* We need to invalidate cached user list entries on a SIGHUP 
133            otherwise cached access denied errors due to restrict anonymous
134            hang around until the sequence number changes. */
135
136         if (!wcache_invalidate_cache()) {
137                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
138                 if (!winbindd_cache_validate_and_initialize()) {
139                         exit(1);
140                 }
141         }
142 }
143
144 /* Handle the signal by unlinking socket and exiting */
145
146 static void terminate(bool is_parent)
147 {
148         if (is_parent) {
149                 /* When parent goes away we should
150                  * remove the socket file. Not so
151                  * when children terminate.
152                  */ 
153                 char *path = NULL;
154
155                 if (asprintf(&path, "%s/%s",
156                         get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
157                         unlink(path);
158                         SAFE_FREE(path);
159                 }
160         }
161
162         idmap_close();
163
164         trustdom_cache_shutdown();
165
166         gencache_stabilize();
167
168 #if 0
169         if (interactive) {
170                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
171                 char *description = talloc_describe_all(mem_ctx);
172
173                 DEBUG(3, ("tallocs left:\n%s\n", description));
174                 talloc_destroy(mem_ctx);
175         }
176 #endif
177
178         if (is_parent) {
179                 pidfile_unlink();
180         }
181
182         exit(0);
183 }
184
185 static void winbindd_sig_term_handler(struct tevent_context *ev,
186                                       struct tevent_signal *se,
187                                       int signum,
188                                       int count,
189                                       void *siginfo,
190                                       void *private_data)
191 {
192         bool *is_parent = talloc_get_type_abort(private_data, bool);
193
194         DEBUG(0,("Got sig[%d] terminate (is_parent=%d)\n",
195                  signum, (int)*is_parent));
196         terminate(*is_parent);
197 }
198
199 bool winbindd_setup_sig_term_handler(bool parent)
200 {
201         struct tevent_signal *se;
202         bool *is_parent;
203
204         is_parent = talloc(winbind_event_context(), bool);
205         if (!is_parent) {
206                 return false;
207         }
208
209         *is_parent = parent;
210
211         se = tevent_add_signal(winbind_event_context(),
212                                is_parent,
213                                SIGTERM, 0,
214                                winbindd_sig_term_handler,
215                                is_parent);
216         if (!se) {
217                 DEBUG(0,("failed to setup SIGTERM handler"));
218                 talloc_free(is_parent);
219                 return false;
220         }
221
222         se = tevent_add_signal(winbind_event_context(),
223                                is_parent,
224                                SIGINT, 0,
225                                winbindd_sig_term_handler,
226                                is_parent);
227         if (!se) {
228                 DEBUG(0,("failed to setup SIGINT handler"));
229                 talloc_free(is_parent);
230                 return false;
231         }
232
233         se = tevent_add_signal(winbind_event_context(),
234                                is_parent,
235                                SIGQUIT, 0,
236                                winbindd_sig_term_handler,
237                                is_parent);
238         if (!se) {
239                 DEBUG(0,("failed to setup SIGINT handler"));
240                 talloc_free(is_parent);
241                 return false;
242         }
243
244         return true;
245 }
246
247 static void winbindd_sig_hup_handler(struct tevent_context *ev,
248                                      struct tevent_signal *se,
249                                      int signum,
250                                      int count,
251                                      void *siginfo,
252                                      void *private_data)
253 {
254         const char *file = (const char *)private_data;
255
256         DEBUG(1,("Reloading services after SIGHUP\n"));
257         flush_caches();
258         reload_services_file(file);
259 }
260
261 bool winbindd_setup_sig_hup_handler(const char *lfile)
262 {
263         struct tevent_signal *se;
264         char *file = NULL;
265
266         if (lfile) {
267                 file = talloc_strdup(winbind_event_context(),
268                                      lfile);
269                 if (!file) {
270                         return false;
271                 }
272         }
273
274         se = tevent_add_signal(winbind_event_context(),
275                                winbind_event_context(),
276                                SIGHUP, 0,
277                                winbindd_sig_hup_handler,
278                                file);
279         if (!se) {
280                 return false;
281         }
282
283         return true;
284 }
285
286 static void winbindd_sig_chld_handler(struct tevent_context *ev,
287                                       struct tevent_signal *se,
288                                       int signum,
289                                       int count,
290                                       void *siginfo,
291                                       void *private_data)
292 {
293         pid_t pid;
294
295         while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
296                 winbind_child_died(pid);
297         }
298 }
299
300 static bool winbindd_setup_sig_chld_handler(void)
301 {
302         struct tevent_signal *se;
303
304         se = tevent_add_signal(winbind_event_context(),
305                                winbind_event_context(),
306                                SIGCHLD, 0,
307                                winbindd_sig_chld_handler,
308                                NULL);
309         if (!se) {
310                 return false;
311         }
312
313         return true;
314 }
315
316 static void winbindd_sig_usr2_handler(struct tevent_context *ev,
317                                       struct tevent_signal *se,
318                                       int signum,
319                                       int count,
320                                       void *siginfo,
321                                       void *private_data)
322 {
323         print_winbindd_status();
324 }
325
326 static bool winbindd_setup_sig_usr2_handler(void)
327 {
328         struct tevent_signal *se;
329
330         se = tevent_add_signal(winbind_event_context(),
331                                winbind_event_context(),
332                                SIGUSR2, 0,
333                                winbindd_sig_usr2_handler,
334                                NULL);
335         if (!se) {
336                 return false;
337         }
338
339         return true;
340 }
341
342 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
343 static void msg_reload_services(struct messaging_context *msg,
344                                 void *private_data,
345                                 uint32_t msg_type,
346                                 struct server_id server_id,
347                                 DATA_BLOB *data)
348 {
349         /* Flush various caches */
350         flush_caches();
351         reload_services_file((const char *) private_data);
352 }
353
354 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
355 static void msg_shutdown(struct messaging_context *msg,
356                          void *private_data,
357                          uint32_t msg_type,
358                          struct server_id server_id,
359                          DATA_BLOB *data)
360 {
361         /* only the parent waits for this message */
362         DEBUG(0,("Got shutdown message\n"));
363         terminate(true);
364 }
365
366
367 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
368                                        void *private_data,
369                                        uint32_t msg_type,
370                                        struct server_id server_id,
371                                        DATA_BLOB *data)
372 {
373         uint8 ret;
374         pid_t child_pid;
375         struct sigaction act;
376         struct sigaction oldact;
377
378         DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
379                    "message.\n"));
380
381         /*
382          * call the validation code from a child:
383          * so we don't block the main winbindd and the validation
384          * code can safely use fork/waitpid...
385          */
386         CatchChild();
387         child_pid = sys_fork();
388
389         if (child_pid == -1) {
390                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
391                           strerror(errno)));
392                 return;
393         }
394
395         if (child_pid != 0) {
396                 /* parent */
397                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
398                           "pid %d.\n", (int)child_pid));
399                 return;
400         }
401
402         /* child */
403
404         /* install default SIGCHLD handler: validation code uses fork/waitpid */
405         ZERO_STRUCT(act);
406         act.sa_handler = SIG_DFL;
407 #ifdef SA_RESTART
408         /* We *want* SIGALRM to interrupt a system call. */
409         act.sa_flags = SA_RESTART;
410 #endif
411         sigemptyset(&act.sa_mask);
412         sigaddset(&act.sa_mask,SIGCHLD);
413         sigaction(SIGCHLD,&act,&oldact);
414
415         ret = (uint8)winbindd_validate_cache_nobackup();
416         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
417         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
418                            (size_t)1);
419         _exit(0);
420 }
421
422 static struct winbindd_dispatch_table {
423         enum winbindd_cmd cmd;
424         void (*fn)(struct winbindd_cli_state *state);
425         const char *winbindd_cmd_name;
426 } dispatch_table[] = {
427
428         /* PAM auth functions */
429
430         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
431         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
432         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
433         { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
434         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
435
436         /* Enumeration functions */
437
438         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
439           "LIST_TRUSTDOM" },
440
441         /* Lookup related functions */
442
443         { WINBINDD_ALLOCATE_UID, winbindd_allocate_uid, "ALLOCATE_UID" },
444         { WINBINDD_ALLOCATE_GID, winbindd_allocate_gid, "ALLOCATE_GID" },
445         { WINBINDD_SET_MAPPING, winbindd_set_mapping, "SET_MAPPING" },
446         { WINBINDD_REMOVE_MAPPING, winbindd_remove_mapping, "REMOVE_MAPPING" },
447         { WINBINDD_SET_HWM, winbindd_set_hwm, "SET_HWMS" },
448
449         /* Miscellaneous */
450
451         { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
452         { WINBINDD_INFO, winbindd_info, "INFO" },
453         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
454           "INTERFACE_VERSION" },
455         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
456         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
457         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
458         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
459           "WINBINDD_PRIV_PIPE_DIR" },
460
461         /* Credential cache access */
462         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
463
464         /* WINS functions */
465
466         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
467         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
468
469         /* End of list */
470
471         { WINBINDD_NUM_CMDS, NULL, "NONE" }
472 };
473
474 struct winbindd_async_dispatch_table {
475         enum winbindd_cmd cmd;
476         const char *cmd_name;
477         struct tevent_req *(*send_req)(TALLOC_CTX *mem_ctx,
478                                        struct tevent_context *ev,
479                                        struct winbindd_cli_state *cli,
480                                        struct winbindd_request *request);
481         NTSTATUS (*recv_req)(struct tevent_req *req,
482                              struct winbindd_response *presp);
483 };
484
485 static struct winbindd_async_dispatch_table async_nonpriv_table[] = {
486         { WINBINDD_PING, "PING",
487           wb_ping_send, wb_ping_recv },
488         { WINBINDD_LOOKUPSID, "LOOKUPSID",
489           winbindd_lookupsid_send, winbindd_lookupsid_recv },
490         { WINBINDD_LOOKUPNAME, "LOOKUPNAME",
491           winbindd_lookupname_send, winbindd_lookupname_recv },
492         { WINBINDD_SID_TO_UID, "SID_TO_UID",
493           winbindd_sid_to_uid_send, winbindd_sid_to_uid_recv },
494         { WINBINDD_SID_TO_GID, "SID_TO_GID",
495           winbindd_sid_to_gid_send, winbindd_sid_to_gid_recv },
496         { WINBINDD_UID_TO_SID, "UID_TO_SID",
497           winbindd_uid_to_sid_send, winbindd_uid_to_sid_recv },
498         { WINBINDD_GID_TO_SID, "GID_TO_SID",
499           winbindd_gid_to_sid_send, winbindd_gid_to_sid_recv },
500         { WINBINDD_GETPWSID, "GETPWSID",
501           winbindd_getpwsid_send, winbindd_getpwsid_recv },
502         { WINBINDD_GETPWNAM, "GETPWNAM",
503           winbindd_getpwnam_send, winbindd_getpwnam_recv },
504         { WINBINDD_GETPWUID, "GETPWUID",
505           winbindd_getpwuid_send, winbindd_getpwuid_recv },
506         { WINBINDD_GETSIDALIASES, "GETSIDALIASES",
507           winbindd_getsidaliases_send, winbindd_getsidaliases_recv },
508         { WINBINDD_GETUSERDOMGROUPS, "GETUSERDOMGROUPS",
509           winbindd_getuserdomgroups_send, winbindd_getuserdomgroups_recv },
510         { WINBINDD_GETGROUPS, "GETGROUPS",
511           winbindd_getgroups_send, winbindd_getgroups_recv },
512         { WINBINDD_SHOW_SEQUENCE, "SHOW_SEQUENCE",
513           winbindd_show_sequence_send, winbindd_show_sequence_recv },
514         { WINBINDD_GETGRGID, "GETGRGID",
515           winbindd_getgrgid_send, winbindd_getgrgid_recv },
516         { WINBINDD_GETGRNAM, "GETGRNAM",
517           winbindd_getgrnam_send, winbindd_getgrnam_recv },
518         { WINBINDD_GETUSERSIDS, "GETUSERSIDS",
519           winbindd_getusersids_send, winbindd_getusersids_recv },
520         { WINBINDD_LOOKUPRIDS, "LOOKUPRIDS",
521           winbindd_lookuprids_send, winbindd_lookuprids_recv },
522         { WINBINDD_SETPWENT, "SETPWENT",
523           winbindd_setpwent_send, winbindd_setpwent_recv },
524         { WINBINDD_GETPWENT, "GETPWENT",
525           winbindd_getpwent_send, winbindd_getpwent_recv },
526         { WINBINDD_ENDPWENT, "ENDPWENT",
527           winbindd_endpwent_send, winbindd_endpwent_recv },
528         { WINBINDD_DSGETDCNAME, "DSGETDCNAME",
529           winbindd_dsgetdcname_send, winbindd_dsgetdcname_recv },
530         { WINBINDD_GETDCNAME, "GETDCNAME",
531           winbindd_getdcname_send, winbindd_getdcname_recv },
532         { WINBINDD_SETGRENT, "SETGRENT",
533           winbindd_setgrent_send, winbindd_setgrent_recv },
534         { WINBINDD_GETGRENT, "GETGRENT",
535           winbindd_getgrent_send, winbindd_getgrent_recv },
536         { WINBINDD_ENDGRENT, "ENDGRENT",
537           winbindd_endgrent_send, winbindd_endgrent_recv },
538         { WINBINDD_LIST_USERS, "LIST_USERS",
539           winbindd_list_users_send, winbindd_list_users_recv },
540         { WINBINDD_LIST_GROUPS, "LIST_GROUPS",
541           winbindd_list_groups_send, winbindd_list_groups_recv },
542
543         { 0, NULL, NULL, NULL }
544 };
545
546 static void wb_request_done(struct tevent_req *req);
547
548 static void process_request(struct winbindd_cli_state *state)
549 {
550         struct winbindd_dispatch_table *table = dispatch_table;
551         struct winbindd_async_dispatch_table *atable;
552
553         state->mem_ctx = talloc_init("winbind request");
554         if (state->mem_ctx == NULL)
555                 return;
556
557         /* Remember who asked us. */
558         state->pid = state->request->pid;
559
560         /* Process command */
561
562         for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
563                 if (state->request->cmd == atable->cmd) {
564                         break;
565                 }
566         }
567
568         if (atable->send_req != NULL) {
569                 struct tevent_req *req;
570
571                 DEBUG(10, ("process_request: Handling async request %s\n",
572                            atable->cmd_name));
573
574                 req = atable->send_req(state->mem_ctx, winbind_event_context(),
575                                        state, state->request);
576                 if (req == NULL) {
577                         DEBUG(0, ("process_request: atable->send failed for "
578                                   "%s\n", atable->cmd_name));
579                         request_error(state);
580                         return;
581                 }
582                 tevent_req_set_callback(req, wb_request_done, state);
583                 state->recv_fn = atable->recv_req;
584                 return;
585         }
586
587         state->response = talloc_zero(state->mem_ctx,
588                                       struct winbindd_response);
589         if (state->response == NULL) {
590                 DEBUG(10, ("talloc failed\n"));
591                 remove_client(state);
592                 return;
593         }
594         state->response->result = WINBINDD_PENDING;
595         state->response->length = sizeof(struct winbindd_response);
596
597         for (table = dispatch_table; table->fn; table++) {
598                 if (state->request->cmd == table->cmd) {
599                         DEBUG(10,("process_request: request fn %s\n",
600                                   table->winbindd_cmd_name ));
601                         table->fn(state);
602                         break;
603                 }
604         }
605
606         if (!table->fn) {
607                 DEBUG(10,("process_request: unknown request fn number %d\n",
608                           (int)state->request->cmd ));
609                 request_error(state);
610         }
611 }
612
613 static void wb_request_done(struct tevent_req *req)
614 {
615         struct winbindd_cli_state *state = tevent_req_callback_data(
616                 req, struct winbindd_cli_state);
617         NTSTATUS status;
618
619         state->response = talloc_zero(state, struct winbindd_response);
620         if (state->response == NULL) {
621                 remove_client(state);
622                 return;
623         }
624         state->response->result = WINBINDD_PENDING;
625         state->response->length = sizeof(struct winbindd_response);
626
627         status = state->recv_fn(req, state->response);
628         TALLOC_FREE(req);
629         if (!NT_STATUS_IS_OK(status)) {
630                 DEBUG(10, ("returning %s\n", nt_errstr(status)));
631                 request_error(state);
632                 return;
633         }
634         request_ok(state);
635 }
636
637 /*
638  * This is the main event loop of winbind requests. It goes through a
639  * state-machine of 3 read/write requests, 4 if you have extra data to send.
640  *
641  * An idle winbind client has a read request of 4 bytes outstanding,
642  * finalizing function is request_len_recv, checking the length. request_recv
643  * then processes the packet. The processing function then at some point has
644  * to call request_finished which schedules sending the response.
645  */
646
647 static void request_finished(struct winbindd_cli_state *state);
648
649 static void winbind_client_request_read(struct tevent_req *req);
650 static void winbind_client_response_written(struct tevent_req *req);
651
652 static void request_finished(struct winbindd_cli_state *state)
653 {
654         struct tevent_req *req;
655
656         TALLOC_FREE(state->request);
657
658         req = wb_resp_write_send(state, winbind_event_context(),
659                                  state->out_queue, state->sock,
660                                  state->response);
661         if (req == NULL) {
662                 remove_client(state);
663                 return;
664         }
665         tevent_req_set_callback(req, winbind_client_response_written, state);
666 }
667
668 static void winbind_client_response_written(struct tevent_req *req)
669 {
670         struct winbindd_cli_state *state = tevent_req_callback_data(
671                 req, struct winbindd_cli_state);
672         ssize_t ret;
673         int err;
674
675         ret = wb_resp_write_recv(req, &err);
676         TALLOC_FREE(req);
677         if (ret == -1) {
678                 DEBUG(2, ("Could not write response to client: %s\n",
679                           strerror(err)));
680                 remove_client(state);
681                 return;
682         }
683
684         TALLOC_FREE(state->mem_ctx);
685         state->response = NULL;
686
687         req = wb_req_read_send(state, winbind_event_context(), state->sock,
688                                WINBINDD_MAX_EXTRA_DATA);
689         if (req == NULL) {
690                 remove_client(state);
691                 return;
692         }
693         tevent_req_set_callback(req, winbind_client_request_read, state);
694 }
695
696 void request_error(struct winbindd_cli_state *state)
697 {
698         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
699         state->response->result = WINBINDD_ERROR;
700         request_finished(state);
701 }
702
703 void request_ok(struct winbindd_cli_state *state)
704 {
705         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
706         state->response->result = WINBINDD_OK;
707         request_finished(state);
708 }
709
710 /* Process a new connection by adding it to the client connection list */
711
712 static void new_connection(int listen_sock, bool privileged)
713 {
714         struct sockaddr_un sunaddr;
715         struct winbindd_cli_state *state;
716         struct tevent_req *req;
717         socklen_t len;
718         int sock;
719
720         /* Accept connection */
721
722         len = sizeof(sunaddr);
723
724         do {
725                 sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr,
726                               &len);
727         } while (sock == -1 && errno == EINTR);
728
729         if (sock == -1)
730                 return;
731
732         DEBUG(6,("accepted socket %d\n", sock));
733
734         /* Create new connection structure */
735
736         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
737                 close(sock);
738                 return;
739         }
740
741         state->sock = sock;
742
743         state->out_queue = tevent_queue_create(state, "winbind client reply");
744         if (state->out_queue == NULL) {
745                 close(sock);
746                 TALLOC_FREE(state);
747                 return;
748         }
749
750         state->last_access = time(NULL);        
751
752         state->privileged = privileged;
753
754         req = wb_req_read_send(state, winbind_event_context(), state->sock,
755                                WINBINDD_MAX_EXTRA_DATA);
756         if (req == NULL) {
757                 TALLOC_FREE(state);
758                 close(sock);
759                 return;
760         }
761         tevent_req_set_callback(req, winbind_client_request_read, state);
762
763         /* Add to connection list */
764
765         winbindd_add_client(state);
766 }
767
768 static void winbind_client_request_read(struct tevent_req *req)
769 {
770         struct winbindd_cli_state *state = tevent_req_callback_data(
771                 req, struct winbindd_cli_state);
772         ssize_t ret;
773         int err;
774
775         ret = wb_req_read_recv(req, state, &state->request, &err);
776         TALLOC_FREE(req);
777         if (ret == -1) {
778                 DEBUG(2, ("Could not read client request: %s\n",
779                           strerror(err)));
780                 remove_client(state);
781                 return;
782         }
783         process_request(state);
784 }
785
786 /* Remove a client connection from client connection list */
787
788 static void remove_client(struct winbindd_cli_state *state)
789 {
790         char c = 0;
791         int nwritten;
792
793         /* It's a dead client - hold a funeral */
794
795         if (state == NULL) {
796                 return;
797         }
798
799         /* tell client, we are closing ... */
800         nwritten = write(state->sock, &c, sizeof(c));
801         if (nwritten == -1) {
802                 /* 
803                  * ignore EPIPE error here, because the other end might
804                  * have already closed the socket.
805                  */
806                 if (errno != EPIPE) {
807                         DEBUG(2, ("final write to client failed: %s\n",
808                                 strerror(errno)));
809                 }
810         }
811
812         /* Close socket */
813
814         close(state->sock);
815
816         /* Free any getent state */
817
818         free_getent_state(state->getgrent_state);
819
820         TALLOC_FREE(state->mem_ctx);
821
822         /* Remove from list and free */
823
824         winbindd_remove_client(state);
825         TALLOC_FREE(state);
826 }
827
828 /* Shutdown client connection which has been idle for the longest time */
829
830 static bool remove_idle_client(void)
831 {
832         struct winbindd_cli_state *state, *remove_state = NULL;
833         time_t last_access = 0;
834         int nidle = 0;
835
836         for (state = winbindd_client_list(); state; state = state->next) {
837                 if (state->response == NULL &&
838                     !state->pwent_state && !state->getgrent_state) {
839                         nidle++;
840                         if (!last_access || state->last_access < last_access) {
841                                 last_access = state->last_access;
842                                 remove_state = state;
843                         }
844                 }
845         }
846
847         if (remove_state) {
848                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
849                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
850                 remove_client(remove_state);
851                 return True;
852         }
853
854         return False;
855 }
856
857 struct winbindd_listen_state {
858         bool privileged;
859         int fd;
860 };
861
862 static void winbindd_listen_fde_handler(struct tevent_context *ev,
863                                         struct tevent_fd *fde,
864                                         uint16_t flags,
865                                         void *private_data)
866 {
867         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
868                                           struct winbindd_listen_state);
869
870         while (winbindd_num_clients() >
871                WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
872                 DEBUG(5,("winbindd: Exceeding %d client "
873                          "connections, removing idle "
874                          "connection.\n",
875                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
876                 if (!remove_idle_client()) {
877                         DEBUG(0,("winbindd: Exceeding %d "
878                                  "client connections, no idle "
879                                  "connection found\n",
880                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
881                         break;
882                 }
883         }
884         new_connection(s->fd, s->privileged);
885 }
886
887 static bool winbindd_setup_listeners(void)
888 {
889         struct winbindd_listen_state *pub_state = NULL;
890         struct winbindd_listen_state *priv_state = NULL;
891         struct tevent_fd *fde;
892
893         pub_state = talloc(winbind_event_context(),
894                            struct winbindd_listen_state);
895         if (!pub_state) {
896                 goto failed;
897         }
898
899         pub_state->privileged = false;
900         pub_state->fd = open_winbindd_socket();
901         if (pub_state->fd == -1) {
902                 goto failed;
903         }
904
905         fde = tevent_add_fd(winbind_event_context(), pub_state, pub_state->fd,
906                             TEVENT_FD_READ, winbindd_listen_fde_handler,
907                             pub_state);
908         if (fde == NULL) {
909                 close(pub_state->fd);
910                 goto failed;
911         }
912         tevent_fd_set_auto_close(fde);
913
914         priv_state = talloc(winbind_event_context(),
915                             struct winbindd_listen_state);
916         if (!priv_state) {
917                 goto failed;
918         }
919
920         priv_state->privileged = true;
921         priv_state->fd = open_winbindd_priv_socket();
922         if (priv_state->fd == -1) {
923                 goto failed;
924         }
925
926         fde = tevent_add_fd(winbind_event_context(), priv_state,
927                             priv_state->fd, TEVENT_FD_READ,
928                             winbindd_listen_fde_handler, priv_state);
929         if (fde == NULL) {
930                 close(priv_state->fd);
931                 goto failed;
932         }
933         tevent_fd_set_auto_close(fde);
934
935         return true;
936 failed:
937         TALLOC_FREE(pub_state);
938         TALLOC_FREE(priv_state);
939         return false;
940 }
941
942 bool winbindd_use_idmap_cache(void)
943 {
944         return !opt_nocache;
945 }
946
947 bool winbindd_use_cache(void)
948 {
949         return !opt_nocache;
950 }
951
952 /* Main function */
953
954 int main(int argc, char **argv, char **envp)
955 {
956         static bool is_daemon = False;
957         static bool Fork = True;
958         static bool log_stdout = False;
959         static bool no_process_group = False;
960         enum {
961                 OPT_DAEMON = 1000,
962                 OPT_FORK,
963                 OPT_NO_PROCESS_GROUP,
964                 OPT_LOG_STDOUT
965         };
966         struct poptOption long_options[] = {
967                 POPT_AUTOHELP
968                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
969                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
970                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
971                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
972                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
973                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
974                 POPT_COMMON_SAMBA
975                 POPT_TABLEEND
976         };
977         poptContext pc;
978         int opt;
979         TALLOC_CTX *frame = talloc_stackframe();
980         struct tevent_timer *te;
981
982         /* glibc (?) likes to print "User defined signal 1" and exit if a
983            SIGUSR[12] is received before a handler is installed */
984
985         CatchSignal(SIGUSR1, SIG_IGN);
986         CatchSignal(SIGUSR2, SIG_IGN);
987
988         fault_setup((void (*)(void *))fault_quit );
989         dump_core_setup("winbindd");
990
991         load_case_tables();
992
993         /* Initialise for running in non-root mode */
994
995         sec_init();
996
997         set_remote_machine_name("winbindd", False);
998
999         /* Set environment variable so we don't recursively call ourselves.
1000            This may also be useful interactively. */
1001
1002         if ( !winbind_off() ) {
1003                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1004                 exit(1);
1005         }
1006
1007         /* Initialise samba/rpc client stuff */
1008
1009         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1010
1011         while ((opt = poptGetNextOpt(pc)) != -1) {
1012                 switch (opt) {
1013                         /* Don't become a daemon */
1014                 case OPT_DAEMON:
1015                         is_daemon = True;
1016                         break;
1017                 case 'i':
1018                         interactive = True;
1019                         log_stdout = True;
1020                         Fork = False;
1021                         break;
1022                 case OPT_FORK:
1023                         Fork = false;
1024                         break;
1025                 case OPT_NO_PROCESS_GROUP:
1026                         no_process_group = true;
1027                         break;
1028                 case OPT_LOG_STDOUT:
1029                         log_stdout = true;
1030                         break;
1031                 case 'n':
1032                         opt_nocache = true;
1033                         break;
1034                 default:
1035                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1036                                   poptBadOption(pc, 0), poptStrerror(opt));
1037                         poptPrintUsage(pc, stderr, 0);
1038                         exit(1);
1039                 }
1040         }
1041
1042         if (is_daemon && interactive) {
1043                 d_fprintf(stderr,"\nERROR: "
1044                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1045                 poptPrintUsage(pc, stderr, 0);
1046                 exit(1);
1047         }
1048
1049         if (log_stdout && Fork) {
1050                 d_fprintf(stderr, "\nERROR: "
1051                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1052                 poptPrintUsage(pc, stderr, 0);
1053                 exit(1);
1054         }
1055
1056         poptFreeContext(pc);
1057
1058         if (!override_logfile) {
1059                 char *lfile = NULL;
1060                 if (asprintf(&lfile,"%s/log.winbindd",
1061                                 get_dyn_LOGFILEBASE()) > 0) {
1062                         lp_set_logfile(lfile);
1063                         SAFE_FREE(lfile);
1064                 }
1065         }
1066         setup_logging("winbindd", log_stdout);
1067         reopen_logs();
1068
1069         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1070         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1071
1072         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1073                 DEBUG(0, ("error opening config file\n"));
1074                 exit(1);
1075         }
1076
1077         /* Initialise messaging system */
1078
1079         if (winbind_messaging_context() == NULL) {
1080                 exit(1);
1081         }
1082
1083         if (!reload_services_file(NULL)) {
1084                 DEBUG(0, ("error opening config file\n"));
1085                 exit(1);
1086         }
1087
1088         if (!directory_exist(lp_lockdir())) {
1089                 mkdir(lp_lockdir(), 0755);
1090         }
1091
1092         /* Setup names. */
1093
1094         if (!init_names())
1095                 exit(1);
1096
1097         load_interfaces();
1098
1099         if (!secrets_init()) {
1100
1101                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1102                 return False;
1103         }
1104
1105         /* Enable netbios namecache */
1106
1107         namecache_enable();
1108
1109         /* Unblock all signals we are interested in as they may have been
1110            blocked by the parent process. */
1111
1112         BlockSignals(False, SIGINT);
1113         BlockSignals(False, SIGQUIT);
1114         BlockSignals(False, SIGTERM);
1115         BlockSignals(False, SIGUSR1);
1116         BlockSignals(False, SIGUSR2);
1117         BlockSignals(False, SIGHUP);
1118         BlockSignals(False, SIGCHLD);
1119
1120         if (!interactive)
1121                 become_daemon(Fork, no_process_group);
1122
1123         pidfile_create("winbindd");
1124
1125 #if HAVE_SETPGID
1126         /*
1127          * If we're interactive we want to set our own process group for
1128          * signal management.
1129          */
1130         if (interactive && !no_process_group)
1131                 setpgid( (pid_t)0, (pid_t)0);
1132 #endif
1133
1134         TimeInit();
1135
1136         /* Don't use winbindd_reinit_after_fork here as
1137          * we're just starting up and haven't created any
1138          * winbindd-specific resources we must free yet. JRA.
1139          */
1140
1141         if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(),
1142                                                winbind_event_context(),
1143                                                false))) {
1144                 DEBUG(0,("reinit_after_fork() failed\n"));
1145                 exit(1);
1146         }
1147
1148         /* Setup signal handlers */
1149
1150         if (!winbindd_setup_sig_term_handler(true))
1151                 exit(1);
1152         if (!winbindd_setup_sig_hup_handler(NULL))
1153                 exit(1);
1154         if (!winbindd_setup_sig_chld_handler())
1155                 exit(1);
1156         if (!winbindd_setup_sig_usr2_handler())
1157                 exit(1);
1158
1159         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1160
1161         /*
1162          * Ensure all cache and idmap caches are consistent
1163          * and initialized before we startup.
1164          */
1165         if (!winbindd_cache_validate_and_initialize()) {
1166                 exit(1);
1167         }
1168
1169         /* get broadcast messages */
1170         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
1171
1172         /* React on 'smbcontrol winbindd reload-config' in the same way
1173            as to SIGHUP signal */
1174         messaging_register(winbind_messaging_context(), NULL,
1175                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1176         messaging_register(winbind_messaging_context(), NULL,
1177                            MSG_SHUTDOWN, msg_shutdown);
1178
1179         /* Handle online/offline messages. */
1180         messaging_register(winbind_messaging_context(), NULL,
1181                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1182         messaging_register(winbind_messaging_context(), NULL,
1183                            MSG_WINBIND_ONLINE, winbind_msg_online);
1184         messaging_register(winbind_messaging_context(), NULL,
1185                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1186
1187         messaging_register(winbind_messaging_context(), NULL,
1188                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1189
1190         messaging_register(winbind_messaging_context(), NULL,
1191                            MSG_WINBIND_VALIDATE_CACHE,
1192                            winbind_msg_validate_cache);
1193
1194         messaging_register(winbind_messaging_context(), NULL,
1195                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1196                            winbind_msg_dump_domain_list);
1197
1198         /* Register handler for MSG_DEBUG. */
1199         messaging_register(winbind_messaging_context(), NULL,
1200                            MSG_DEBUG,
1201                            winbind_msg_debug);
1202
1203         netsamlogon_cache_init(); /* Non-critical */
1204
1205         /* clear the cached list of trusted domains */
1206
1207         wcache_tdc_clear();     
1208
1209         if (!init_domain_list()) {
1210                 DEBUG(0,("unable to initialize domain list\n"));
1211                 exit(1);
1212         }
1213
1214         init_idmap_child();
1215         init_locator_child();
1216
1217         smb_nscd_flush_user_cache();
1218         smb_nscd_flush_group_cache();
1219
1220         /* setup listen sockets */
1221
1222         if (!winbindd_setup_listeners()) {
1223                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1224                 exit(1);
1225         }
1226
1227         te = tevent_add_timer(winbind_event_context(), NULL, timeval_zero(),
1228                               rescan_trusted_domains, NULL);
1229         if (te == NULL) {
1230                 DEBUG(0, ("Could not trigger rescan_trusted_domains()\n"));
1231                 exit(1);
1232         }
1233
1234         TALLOC_FREE(frame);
1235         /* Loop waiting for requests */
1236         while (1) {
1237                 frame = talloc_stackframe();
1238
1239                 if (tevent_loop_once(winbind_event_context()) == -1) {
1240                         DEBUG(1, ("tevent_loop_once() failed: %s\n",
1241                                   strerror(errno)));
1242                         return 1;
1243                 }
1244
1245                 TALLOC_FREE(frame);
1246         }
1247
1248         return 0;
1249 }