1d3762f5b95b568efb9154c3b0d81e1ae7901c3c
[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_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
439         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
440           "LIST_TRUSTDOM" },
441
442         /* Lookup related functions */
443
444         { WINBINDD_ALLOCATE_UID, winbindd_allocate_uid, "ALLOCATE_UID" },
445         { WINBINDD_ALLOCATE_GID, winbindd_allocate_gid, "ALLOCATE_GID" },
446         { WINBINDD_SET_MAPPING, winbindd_set_mapping, "SET_MAPPING" },
447         { WINBINDD_REMOVE_MAPPING, winbindd_remove_mapping, "REMOVE_MAPPING" },
448         { WINBINDD_SET_HWM, winbindd_set_hwm, "SET_HWMS" },
449
450         /* Miscellaneous */
451
452         { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
453         { WINBINDD_INFO, winbindd_info, "INFO" },
454         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
455           "INTERFACE_VERSION" },
456         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
457         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
458         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
459         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
460           "WINBINDD_PRIV_PIPE_DIR" },
461
462         /* Credential cache access */
463         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
464
465         /* WINS functions */
466
467         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
468         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
469
470         /* End of list */
471
472         { WINBINDD_NUM_CMDS, NULL, "NONE" }
473 };
474
475 struct winbindd_async_dispatch_table {
476         enum winbindd_cmd cmd;
477         const char *cmd_name;
478         struct tevent_req *(*send_req)(TALLOC_CTX *mem_ctx,
479                                        struct tevent_context *ev,
480                                        struct winbindd_cli_state *cli,
481                                        struct winbindd_request *request);
482         NTSTATUS (*recv_req)(struct tevent_req *req,
483                              struct winbindd_response *presp);
484 };
485
486 static struct winbindd_async_dispatch_table async_nonpriv_table[] = {
487         { WINBINDD_PING, "PING",
488           wb_ping_send, wb_ping_recv },
489         { WINBINDD_LOOKUPSID, "LOOKUPSID",
490           winbindd_lookupsid_send, winbindd_lookupsid_recv },
491         { WINBINDD_LOOKUPNAME, "LOOKUPNAME",
492           winbindd_lookupname_send, winbindd_lookupname_recv },
493         { WINBINDD_SID_TO_UID, "SID_TO_UID",
494           winbindd_sid_to_uid_send, winbindd_sid_to_uid_recv },
495         { WINBINDD_SID_TO_GID, "SID_TO_GID",
496           winbindd_sid_to_gid_send, winbindd_sid_to_gid_recv },
497         { WINBINDD_UID_TO_SID, "UID_TO_SID",
498           winbindd_uid_to_sid_send, winbindd_uid_to_sid_recv },
499         { WINBINDD_GID_TO_SID, "GID_TO_SID",
500           winbindd_gid_to_sid_send, winbindd_gid_to_sid_recv },
501         { WINBINDD_GETPWSID, "GETPWSID",
502           winbindd_getpwsid_send, winbindd_getpwsid_recv },
503         { WINBINDD_GETPWNAM, "GETPWNAM",
504           winbindd_getpwnam_send, winbindd_getpwnam_recv },
505         { WINBINDD_GETPWUID, "GETPWUID",
506           winbindd_getpwuid_send, winbindd_getpwuid_recv },
507         { WINBINDD_GETSIDALIASES, "GETSIDALIASES",
508           winbindd_getsidaliases_send, winbindd_getsidaliases_recv },
509         { WINBINDD_GETUSERDOMGROUPS, "GETUSERDOMGROUPS",
510           winbindd_getuserdomgroups_send, winbindd_getuserdomgroups_recv },
511         { WINBINDD_GETGROUPS, "GETGROUPS",
512           winbindd_getgroups_send, winbindd_getgroups_recv },
513         { WINBINDD_SHOW_SEQUENCE, "SHOW_SEQUENCE",
514           winbindd_show_sequence_send, winbindd_show_sequence_recv },
515         { WINBINDD_GETGRGID, "GETGRGID",
516           winbindd_getgrgid_send, winbindd_getgrgid_recv },
517         { WINBINDD_GETGRNAM, "GETGRNAM",
518           winbindd_getgrnam_send, winbindd_getgrnam_recv },
519         { WINBINDD_GETUSERSIDS, "GETUSERSIDS",
520           winbindd_getusersids_send, winbindd_getusersids_recv },
521         { WINBINDD_LOOKUPRIDS, "LOOKUPRIDS",
522           winbindd_lookuprids_send, winbindd_lookuprids_recv },
523         { WINBINDD_SETPWENT, "SETPWENT",
524           winbindd_setpwent_send, winbindd_setpwent_recv },
525         { WINBINDD_GETPWENT, "GETPWENT",
526           winbindd_getpwent_send, winbindd_getpwent_recv },
527         { WINBINDD_ENDPWENT, "ENDPWENT",
528           winbindd_endpwent_send, winbindd_endpwent_recv },
529         { WINBINDD_DSGETDCNAME, "DSGETDCNAME",
530           winbindd_dsgetdcname_send, winbindd_dsgetdcname_recv },
531         { WINBINDD_GETDCNAME, "GETDCNAME",
532           winbindd_getdcname_send, winbindd_getdcname_recv },
533         { WINBINDD_SETGRENT, "SETGRENT",
534           winbindd_setgrent_send, winbindd_setgrent_recv },
535         { WINBINDD_GETGRENT, "GETGRENT",
536           winbindd_getgrent_send, winbindd_getgrent_recv },
537         { WINBINDD_ENDGRENT, "ENDGRENT",
538           winbindd_endgrent_send, winbindd_endgrent_recv },
539         { WINBINDD_LIST_USERS, "LIST_USERS",
540           winbindd_list_users_send, winbindd_list_users_recv },
541
542         { 0, NULL, NULL, NULL }
543 };
544
545 static void wb_request_done(struct tevent_req *req);
546
547 static void process_request(struct winbindd_cli_state *state)
548 {
549         struct winbindd_dispatch_table *table = dispatch_table;
550         struct winbindd_async_dispatch_table *atable;
551
552         state->mem_ctx = talloc_init("winbind request");
553         if (state->mem_ctx == NULL)
554                 return;
555
556         /* Remember who asked us. */
557         state->pid = state->request->pid;
558
559         /* Process command */
560
561         for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
562                 if (state->request->cmd == atable->cmd) {
563                         break;
564                 }
565         }
566
567         if (atable->send_req != NULL) {
568                 struct tevent_req *req;
569
570                 DEBUG(10, ("process_request: Handling async request %s\n",
571                            atable->cmd_name));
572
573                 req = atable->send_req(state->mem_ctx, winbind_event_context(),
574                                        state, state->request);
575                 if (req == NULL) {
576                         DEBUG(0, ("process_request: atable->send failed for "
577                                   "%s\n", atable->cmd_name));
578                         request_error(state);
579                         return;
580                 }
581                 tevent_req_set_callback(req, wb_request_done, state);
582                 state->recv_fn = atable->recv_req;
583                 return;
584         }
585
586         state->response = talloc_zero(state->mem_ctx,
587                                       struct winbindd_response);
588         if (state->response == NULL) {
589                 DEBUG(10, ("talloc failed\n"));
590                 remove_client(state);
591                 return;
592         }
593         state->response->result = WINBINDD_PENDING;
594         state->response->length = sizeof(struct winbindd_response);
595
596         for (table = dispatch_table; table->fn; table++) {
597                 if (state->request->cmd == table->cmd) {
598                         DEBUG(10,("process_request: request fn %s\n",
599                                   table->winbindd_cmd_name ));
600                         table->fn(state);
601                         break;
602                 }
603         }
604
605         if (!table->fn) {
606                 DEBUG(10,("process_request: unknown request fn number %d\n",
607                           (int)state->request->cmd ));
608                 request_error(state);
609         }
610 }
611
612 static void wb_request_done(struct tevent_req *req)
613 {
614         struct winbindd_cli_state *state = tevent_req_callback_data(
615                 req, struct winbindd_cli_state);
616         NTSTATUS status;
617
618         state->response = talloc_zero(state, struct winbindd_response);
619         if (state->response == NULL) {
620                 remove_client(state);
621                 return;
622         }
623         state->response->result = WINBINDD_PENDING;
624         state->response->length = sizeof(struct winbindd_response);
625
626         status = state->recv_fn(req, state->response);
627         TALLOC_FREE(req);
628         if (!NT_STATUS_IS_OK(status)) {
629                 DEBUG(10, ("returning %s\n", nt_errstr(status)));
630                 request_error(state);
631                 return;
632         }
633         request_ok(state);
634 }
635
636 /*
637  * This is the main event loop of winbind requests. It goes through a
638  * state-machine of 3 read/write requests, 4 if you have extra data to send.
639  *
640  * An idle winbind client has a read request of 4 bytes outstanding,
641  * finalizing function is request_len_recv, checking the length. request_recv
642  * then processes the packet. The processing function then at some point has
643  * to call request_finished which schedules sending the response.
644  */
645
646 static void request_finished(struct winbindd_cli_state *state);
647
648 static void winbind_client_request_read(struct tevent_req *req);
649 static void winbind_client_response_written(struct tevent_req *req);
650
651 static void request_finished(struct winbindd_cli_state *state)
652 {
653         struct tevent_req *req;
654
655         TALLOC_FREE(state->request);
656
657         req = wb_resp_write_send(state, winbind_event_context(),
658                                  state->out_queue, state->sock,
659                                  state->response);
660         if (req == NULL) {
661                 remove_client(state);
662                 return;
663         }
664         tevent_req_set_callback(req, winbind_client_response_written, state);
665 }
666
667 static void winbind_client_response_written(struct tevent_req *req)
668 {
669         struct winbindd_cli_state *state = tevent_req_callback_data(
670                 req, struct winbindd_cli_state);
671         ssize_t ret;
672         int err;
673
674         ret = wb_resp_write_recv(req, &err);
675         TALLOC_FREE(req);
676         if (ret == -1) {
677                 DEBUG(2, ("Could not write response to client: %s\n",
678                           strerror(err)));
679                 remove_client(state);
680                 return;
681         }
682
683         TALLOC_FREE(state->mem_ctx);
684         state->response = NULL;
685
686         req = wb_req_read_send(state, winbind_event_context(), state->sock,
687                                WINBINDD_MAX_EXTRA_DATA);
688         if (req == NULL) {
689                 remove_client(state);
690                 return;
691         }
692         tevent_req_set_callback(req, winbind_client_request_read, state);
693 }
694
695 void request_error(struct winbindd_cli_state *state)
696 {
697         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
698         state->response->result = WINBINDD_ERROR;
699         request_finished(state);
700 }
701
702 void request_ok(struct winbindd_cli_state *state)
703 {
704         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
705         state->response->result = WINBINDD_OK;
706         request_finished(state);
707 }
708
709 /* Process a new connection by adding it to the client connection list */
710
711 static void new_connection(int listen_sock, bool privileged)
712 {
713         struct sockaddr_un sunaddr;
714         struct winbindd_cli_state *state;
715         struct tevent_req *req;
716         socklen_t len;
717         int sock;
718
719         /* Accept connection */
720
721         len = sizeof(sunaddr);
722
723         do {
724                 sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr,
725                               &len);
726         } while (sock == -1 && errno == EINTR);
727
728         if (sock == -1)
729                 return;
730
731         DEBUG(6,("accepted socket %d\n", sock));
732
733         /* Create new connection structure */
734
735         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
736                 close(sock);
737                 return;
738         }
739
740         state->sock = sock;
741
742         state->out_queue = tevent_queue_create(state, "winbind client reply");
743         if (state->out_queue == NULL) {
744                 close(sock);
745                 TALLOC_FREE(state);
746                 return;
747         }
748
749         state->last_access = time(NULL);        
750
751         state->privileged = privileged;
752
753         req = wb_req_read_send(state, winbind_event_context(), state->sock,
754                                WINBINDD_MAX_EXTRA_DATA);
755         if (req == NULL) {
756                 TALLOC_FREE(state);
757                 close(sock);
758                 return;
759         }
760         tevent_req_set_callback(req, winbind_client_request_read, state);
761
762         /* Add to connection list */
763
764         winbindd_add_client(state);
765 }
766
767 static void winbind_client_request_read(struct tevent_req *req)
768 {
769         struct winbindd_cli_state *state = tevent_req_callback_data(
770                 req, struct winbindd_cli_state);
771         ssize_t ret;
772         int err;
773
774         ret = wb_req_read_recv(req, state, &state->request, &err);
775         TALLOC_FREE(req);
776         if (ret == -1) {
777                 DEBUG(2, ("Could not read client request: %s\n",
778                           strerror(err)));
779                 remove_client(state);
780                 return;
781         }
782         process_request(state);
783 }
784
785 /* Remove a client connection from client connection list */
786
787 static void remove_client(struct winbindd_cli_state *state)
788 {
789         char c = 0;
790         int nwritten;
791
792         /* It's a dead client - hold a funeral */
793
794         if (state == NULL) {
795                 return;
796         }
797
798         /* tell client, we are closing ... */
799         nwritten = write(state->sock, &c, sizeof(c));
800         if (nwritten == -1) {
801                 /* 
802                  * ignore EPIPE error here, because the other end might
803                  * have already closed the socket.
804                  */
805                 if (errno != EPIPE) {
806                         DEBUG(2, ("final write to client failed: %s\n",
807                                 strerror(errno)));
808                 }
809         }
810
811         /* Close socket */
812
813         close(state->sock);
814
815         /* Free any getent state */
816
817         free_getent_state(state->getgrent_state);
818
819         TALLOC_FREE(state->mem_ctx);
820
821         /* Remove from list and free */
822
823         winbindd_remove_client(state);
824         TALLOC_FREE(state);
825 }
826
827 /* Shutdown client connection which has been idle for the longest time */
828
829 static bool remove_idle_client(void)
830 {
831         struct winbindd_cli_state *state, *remove_state = NULL;
832         time_t last_access = 0;
833         int nidle = 0;
834
835         for (state = winbindd_client_list(); state; state = state->next) {
836                 if (state->response == NULL &&
837                     !state->pwent_state && !state->getgrent_state) {
838                         nidle++;
839                         if (!last_access || state->last_access < last_access) {
840                                 last_access = state->last_access;
841                                 remove_state = state;
842                         }
843                 }
844         }
845
846         if (remove_state) {
847                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
848                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
849                 remove_client(remove_state);
850                 return True;
851         }
852
853         return False;
854 }
855
856 struct winbindd_listen_state {
857         bool privileged;
858         int fd;
859 };
860
861 static void winbindd_listen_fde_handler(struct tevent_context *ev,
862                                         struct tevent_fd *fde,
863                                         uint16_t flags,
864                                         void *private_data)
865 {
866         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
867                                           struct winbindd_listen_state);
868
869         while (winbindd_num_clients() >
870                WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
871                 DEBUG(5,("winbindd: Exceeding %d client "
872                          "connections, removing idle "
873                          "connection.\n",
874                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
875                 if (!remove_idle_client()) {
876                         DEBUG(0,("winbindd: Exceeding %d "
877                                  "client connections, no idle "
878                                  "connection found\n",
879                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
880                         break;
881                 }
882         }
883         new_connection(s->fd, s->privileged);
884 }
885
886 static bool winbindd_setup_listeners(void)
887 {
888         struct winbindd_listen_state *pub_state = NULL;
889         struct winbindd_listen_state *priv_state = NULL;
890         struct tevent_fd *fde;
891
892         pub_state = talloc(winbind_event_context(),
893                            struct winbindd_listen_state);
894         if (!pub_state) {
895                 goto failed;
896         }
897
898         pub_state->privileged = false;
899         pub_state->fd = open_winbindd_socket();
900         if (pub_state->fd == -1) {
901                 goto failed;
902         }
903
904         fde = tevent_add_fd(winbind_event_context(), pub_state, pub_state->fd,
905                             TEVENT_FD_READ, winbindd_listen_fde_handler,
906                             pub_state);
907         if (fde == NULL) {
908                 close(pub_state->fd);
909                 goto failed;
910         }
911         tevent_fd_set_auto_close(fde);
912
913         priv_state = talloc(winbind_event_context(),
914                             struct winbindd_listen_state);
915         if (!priv_state) {
916                 goto failed;
917         }
918
919         priv_state->privileged = true;
920         priv_state->fd = open_winbindd_priv_socket();
921         if (priv_state->fd == -1) {
922                 goto failed;
923         }
924
925         fde = tevent_add_fd(winbind_event_context(), priv_state,
926                             priv_state->fd, TEVENT_FD_READ,
927                             winbindd_listen_fde_handler, priv_state);
928         if (fde == NULL) {
929                 close(priv_state->fd);
930                 goto failed;
931         }
932         tevent_fd_set_auto_close(fde);
933
934         return true;
935 failed:
936         TALLOC_FREE(pub_state);
937         TALLOC_FREE(priv_state);
938         return false;
939 }
940
941 bool winbindd_use_idmap_cache(void)
942 {
943         return !opt_nocache;
944 }
945
946 bool winbindd_use_cache(void)
947 {
948         return !opt_nocache;
949 }
950
951 /* Main function */
952
953 int main(int argc, char **argv, char **envp)
954 {
955         static bool is_daemon = False;
956         static bool Fork = True;
957         static bool log_stdout = False;
958         static bool no_process_group = False;
959         enum {
960                 OPT_DAEMON = 1000,
961                 OPT_FORK,
962                 OPT_NO_PROCESS_GROUP,
963                 OPT_LOG_STDOUT
964         };
965         struct poptOption long_options[] = {
966                 POPT_AUTOHELP
967                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
968                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
969                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
970                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
971                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
972                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
973                 POPT_COMMON_SAMBA
974                 POPT_TABLEEND
975         };
976         poptContext pc;
977         int opt;
978         TALLOC_CTX *frame = talloc_stackframe();
979         struct tevent_timer *te;
980
981         /* glibc (?) likes to print "User defined signal 1" and exit if a
982            SIGUSR[12] is received before a handler is installed */
983
984         CatchSignal(SIGUSR1, SIG_IGN);
985         CatchSignal(SIGUSR2, SIG_IGN);
986
987         fault_setup((void (*)(void *))fault_quit );
988         dump_core_setup("winbindd");
989
990         load_case_tables();
991
992         /* Initialise for running in non-root mode */
993
994         sec_init();
995
996         set_remote_machine_name("winbindd", False);
997
998         /* Set environment variable so we don't recursively call ourselves.
999            This may also be useful interactively. */
1000
1001         if ( !winbind_off() ) {
1002                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1003                 exit(1);
1004         }
1005
1006         /* Initialise samba/rpc client stuff */
1007
1008         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1009
1010         while ((opt = poptGetNextOpt(pc)) != -1) {
1011                 switch (opt) {
1012                         /* Don't become a daemon */
1013                 case OPT_DAEMON:
1014                         is_daemon = True;
1015                         break;
1016                 case 'i':
1017                         interactive = True;
1018                         log_stdout = True;
1019                         Fork = False;
1020                         break;
1021                 case OPT_FORK:
1022                         Fork = false;
1023                         break;
1024                 case OPT_NO_PROCESS_GROUP:
1025                         no_process_group = true;
1026                         break;
1027                 case OPT_LOG_STDOUT:
1028                         log_stdout = true;
1029                         break;
1030                 case 'n':
1031                         opt_nocache = true;
1032                         break;
1033                 default:
1034                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1035                                   poptBadOption(pc, 0), poptStrerror(opt));
1036                         poptPrintUsage(pc, stderr, 0);
1037                         exit(1);
1038                 }
1039         }
1040
1041         if (is_daemon && interactive) {
1042                 d_fprintf(stderr,"\nERROR: "
1043                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1044                 poptPrintUsage(pc, stderr, 0);
1045                 exit(1);
1046         }
1047
1048         if (log_stdout && Fork) {
1049                 d_fprintf(stderr, "\nERROR: "
1050                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1051                 poptPrintUsage(pc, stderr, 0);
1052                 exit(1);
1053         }
1054
1055         poptFreeContext(pc);
1056
1057         if (!override_logfile) {
1058                 char *lfile = NULL;
1059                 if (asprintf(&lfile,"%s/log.winbindd",
1060                                 get_dyn_LOGFILEBASE()) > 0) {
1061                         lp_set_logfile(lfile);
1062                         SAFE_FREE(lfile);
1063                 }
1064         }
1065         setup_logging("winbindd", log_stdout);
1066         reopen_logs();
1067
1068         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1069         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1070
1071         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1072                 DEBUG(0, ("error opening config file\n"));
1073                 exit(1);
1074         }
1075
1076         /* Initialise messaging system */
1077
1078         if (winbind_messaging_context() == NULL) {
1079                 exit(1);
1080         }
1081
1082         if (!reload_services_file(NULL)) {
1083                 DEBUG(0, ("error opening config file\n"));
1084                 exit(1);
1085         }
1086
1087         if (!directory_exist(lp_lockdir())) {
1088                 mkdir(lp_lockdir(), 0755);
1089         }
1090
1091         /* Setup names. */
1092
1093         if (!init_names())
1094                 exit(1);
1095
1096         load_interfaces();
1097
1098         if (!secrets_init()) {
1099
1100                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1101                 return False;
1102         }
1103
1104         /* Enable netbios namecache */
1105
1106         namecache_enable();
1107
1108         /* Unblock all signals we are interested in as they may have been
1109            blocked by the parent process. */
1110
1111         BlockSignals(False, SIGINT);
1112         BlockSignals(False, SIGQUIT);
1113         BlockSignals(False, SIGTERM);
1114         BlockSignals(False, SIGUSR1);
1115         BlockSignals(False, SIGUSR2);
1116         BlockSignals(False, SIGHUP);
1117         BlockSignals(False, SIGCHLD);
1118
1119         if (!interactive)
1120                 become_daemon(Fork, no_process_group);
1121
1122         pidfile_create("winbindd");
1123
1124 #if HAVE_SETPGID
1125         /*
1126          * If we're interactive we want to set our own process group for
1127          * signal management.
1128          */
1129         if (interactive && !no_process_group)
1130                 setpgid( (pid_t)0, (pid_t)0);
1131 #endif
1132
1133         TimeInit();
1134
1135         /* Don't use winbindd_reinit_after_fork here as
1136          * we're just starting up and haven't created any
1137          * winbindd-specific resources we must free yet. JRA.
1138          */
1139
1140         if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(),
1141                                                winbind_event_context(),
1142                                                false))) {
1143                 DEBUG(0,("reinit_after_fork() failed\n"));
1144                 exit(1);
1145         }
1146
1147         /* Setup signal handlers */
1148
1149         if (!winbindd_setup_sig_term_handler(true))
1150                 exit(1);
1151         if (!winbindd_setup_sig_hup_handler(NULL))
1152                 exit(1);
1153         if (!winbindd_setup_sig_chld_handler())
1154                 exit(1);
1155         if (!winbindd_setup_sig_usr2_handler())
1156                 exit(1);
1157
1158         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1159
1160         /*
1161          * Ensure all cache and idmap caches are consistent
1162          * and initialized before we startup.
1163          */
1164         if (!winbindd_cache_validate_and_initialize()) {
1165                 exit(1);
1166         }
1167
1168         /* get broadcast messages */
1169         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
1170
1171         /* React on 'smbcontrol winbindd reload-config' in the same way
1172            as to SIGHUP signal */
1173         messaging_register(winbind_messaging_context(), NULL,
1174                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1175         messaging_register(winbind_messaging_context(), NULL,
1176                            MSG_SHUTDOWN, msg_shutdown);
1177
1178         /* Handle online/offline messages. */
1179         messaging_register(winbind_messaging_context(), NULL,
1180                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1181         messaging_register(winbind_messaging_context(), NULL,
1182                            MSG_WINBIND_ONLINE, winbind_msg_online);
1183         messaging_register(winbind_messaging_context(), NULL,
1184                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1185
1186         messaging_register(winbind_messaging_context(), NULL,
1187                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1188
1189         messaging_register(winbind_messaging_context(), NULL,
1190                            MSG_WINBIND_VALIDATE_CACHE,
1191                            winbind_msg_validate_cache);
1192
1193         messaging_register(winbind_messaging_context(), NULL,
1194                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1195                            winbind_msg_dump_domain_list);
1196
1197         /* Register handler for MSG_DEBUG. */
1198         messaging_register(winbind_messaging_context(), NULL,
1199                            MSG_DEBUG,
1200                            winbind_msg_debug);
1201
1202         netsamlogon_cache_init(); /* Non-critical */
1203
1204         /* clear the cached list of trusted domains */
1205
1206         wcache_tdc_clear();     
1207
1208         if (!init_domain_list()) {
1209                 DEBUG(0,("unable to initialize domain list\n"));
1210                 exit(1);
1211         }
1212
1213         init_idmap_child();
1214         init_locator_child();
1215
1216         smb_nscd_flush_user_cache();
1217         smb_nscd_flush_group_cache();
1218
1219         /* setup listen sockets */
1220
1221         if (!winbindd_setup_listeners()) {
1222                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1223                 exit(1);
1224         }
1225
1226         te = tevent_add_timer(winbind_event_context(), NULL, timeval_zero(),
1227                               rescan_trusted_domains, NULL);
1228         if (te == NULL) {
1229                 DEBUG(0, ("Could not trigger rescan_trusted_domains()\n"));
1230                 exit(1);
1231         }
1232
1233         TALLOC_FREE(frame);
1234         /* Loop waiting for requests */
1235         while (1) {
1236                 frame = talloc_stackframe();
1237
1238                 if (tevent_loop_once(winbind_event_context()) == -1) {
1239                         DEBUG(1, ("tevent_loop_once() failed: %s\n",
1240                                   strerror(errno)));
1241                         return 1;
1242                 }
1243
1244                 TALLOC_FREE(frame);
1245         }
1246
1247         return 0;
1248 }