s3:winbind: remove the method REMOVE_MAPPING from winbind's API
[amitay/samba.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 "popt_common.h"
27 #include "winbindd.h"
28 #include "../../nsswitch/libwbclient/wbc_async.h"
29 #include "librpc/gen_ndr/messaging.h"
30 #include "../librpc/gen_ndr/srv_lsa.h"
31 #include "../librpc/gen_ndr/srv_samr.h"
32 #include "secrets.h"
33
34 #undef DBGC_CLASS
35 #define DBGC_CLASS DBGC_WINBIND
36
37 static void remove_client(struct winbindd_cli_state *state);
38
39 static bool opt_nocache = False;
40 static bool interactive = False;
41
42 extern bool override_logfile;
43
44 /* Reload configuration */
45
46 static bool reload_services_file(const char *lfile)
47 {
48         bool ret;
49
50         if (lp_loaded()) {
51                 const char *fname = lp_configfile();
52
53                 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
54                         set_dyn_CONFIGFILE(fname);
55                 }
56         }
57
58         /* if this is a child, restore the logfile to the special
59            name - <domain>, idmap, etc. */
60         if (lfile && *lfile) {
61                 lp_set_logfile(lfile);
62         }
63
64         reopen_logs();
65         ret = lp_load(get_dyn_CONFIGFILE(),False,False,True,True);
66
67         reopen_logs();
68         load_interfaces();
69
70         return(ret);
71 }
72
73
74 /**************************************************************************** **
75  Handle a fault..
76  **************************************************************************** */
77
78 static void fault_quit(void)
79 {
80         dump_core();
81 }
82
83 static void winbindd_status(void)
84 {
85         struct winbindd_cli_state *tmp;
86
87         DEBUG(0, ("winbindd status:\n"));
88
89         /* Print client state information */
90
91         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
92
93         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
94                 DEBUG(2, ("\tclient list:\n"));
95                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
96                         DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
97                                   (unsigned long)tmp->pid, tmp->sock));
98                 }
99         }
100 }
101
102 /* Print winbindd status to log file */
103
104 static void print_winbindd_status(void)
105 {
106         winbindd_status();
107 }
108
109 /* Flush client cache */
110
111 static void flush_caches(void)
112 {
113         /* We need to invalidate cached user list entries on a SIGHUP 
114            otherwise cached access denied errors due to restrict anonymous
115            hang around until the sequence number changes. */
116
117         if (!wcache_invalidate_cache()) {
118                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
119                 if (!winbindd_cache_validate_and_initialize()) {
120                         exit(1);
121                 }
122         }
123 }
124
125 static void flush_caches_noinit(void)
126 {
127         /*
128          * We need to invalidate cached user list entries on a SIGHUP
129          * otherwise cached access denied errors due to restrict anonymous
130          * hang around until the sequence number changes.
131          * NB
132          * Skip uninitialized domains when flush cache.
133          * If domain is not initialized, it means it is never
134          * used or never become online. look, wcache_invalidate_cache()
135          * -> get_cache() -> init_dc_connection(). It causes a lot of traffic
136          * for unused domains and large traffic for primay domain's DC if there
137          * are many domains..
138          */
139
140         if (!wcache_invalidate_cache_noinit()) {
141                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
142                 if (!winbindd_cache_validate_and_initialize()) {
143                         exit(1);
144                 }
145         }
146 }
147
148 /* Handle the signal by unlinking socket and exiting */
149
150 static void terminate(bool is_parent)
151 {
152         if (is_parent) {
153                 /* When parent goes away we should
154                  * remove the socket file. Not so
155                  * when children terminate.
156                  */ 
157                 char *path = NULL;
158
159                 if (asprintf(&path, "%s/%s",
160                         get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
161                         unlink(path);
162                         SAFE_FREE(path);
163                 }
164         }
165
166         idmap_close();
167
168         trustdom_cache_shutdown();
169
170         gencache_stabilize();
171
172 #if 0
173         if (interactive) {
174                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
175                 char *description = talloc_describe_all(mem_ctx);
176
177                 DEBUG(3, ("tallocs left:\n%s\n", description));
178                 talloc_destroy(mem_ctx);
179         }
180 #endif
181
182         if (is_parent) {
183                 serverid_deregister(procid_self());
184                 pidfile_unlink();
185         }
186
187         exit(0);
188 }
189
190 static void winbindd_sig_term_handler(struct tevent_context *ev,
191                                       struct tevent_signal *se,
192                                       int signum,
193                                       int count,
194                                       void *siginfo,
195                                       void *private_data)
196 {
197         bool *is_parent = talloc_get_type_abort(private_data, bool);
198
199         DEBUG(0,("Got sig[%d] terminate (is_parent=%d)\n",
200                  signum, (int)*is_parent));
201         terminate(*is_parent);
202 }
203
204 bool winbindd_setup_sig_term_handler(bool parent)
205 {
206         struct tevent_signal *se;
207         bool *is_parent;
208
209         is_parent = talloc(winbind_event_context(), bool);
210         if (!is_parent) {
211                 return false;
212         }
213
214         *is_parent = parent;
215
216         se = tevent_add_signal(winbind_event_context(),
217                                is_parent,
218                                SIGTERM, 0,
219                                winbindd_sig_term_handler,
220                                is_parent);
221         if (!se) {
222                 DEBUG(0,("failed to setup SIGTERM handler"));
223                 talloc_free(is_parent);
224                 return false;
225         }
226
227         se = tevent_add_signal(winbind_event_context(),
228                                is_parent,
229                                SIGINT, 0,
230                                winbindd_sig_term_handler,
231                                is_parent);
232         if (!se) {
233                 DEBUG(0,("failed to setup SIGINT handler"));
234                 talloc_free(is_parent);
235                 return false;
236         }
237
238         se = tevent_add_signal(winbind_event_context(),
239                                is_parent,
240                                SIGQUIT, 0,
241                                winbindd_sig_term_handler,
242                                is_parent);
243         if (!se) {
244                 DEBUG(0,("failed to setup SIGINT handler"));
245                 talloc_free(is_parent);
246                 return false;
247         }
248
249         return true;
250 }
251
252 static void winbindd_sig_hup_handler(struct tevent_context *ev,
253                                      struct tevent_signal *se,
254                                      int signum,
255                                      int count,
256                                      void *siginfo,
257                                      void *private_data)
258 {
259         const char *file = (const char *)private_data;
260
261         DEBUG(1,("Reloading services after SIGHUP\n"));
262         flush_caches_noinit();
263         reload_services_file(file);
264 }
265
266 bool winbindd_setup_sig_hup_handler(const char *lfile)
267 {
268         struct tevent_signal *se;
269         char *file = NULL;
270
271         if (lfile) {
272                 file = talloc_strdup(winbind_event_context(),
273                                      lfile);
274                 if (!file) {
275                         return false;
276                 }
277         }
278
279         se = tevent_add_signal(winbind_event_context(),
280                                winbind_event_context(),
281                                SIGHUP, 0,
282                                winbindd_sig_hup_handler,
283                                file);
284         if (!se) {
285                 return false;
286         }
287
288         return true;
289 }
290
291 static void winbindd_sig_chld_handler(struct tevent_context *ev,
292                                       struct tevent_signal *se,
293                                       int signum,
294                                       int count,
295                                       void *siginfo,
296                                       void *private_data)
297 {
298         pid_t pid;
299
300         while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
301                 winbind_child_died(pid);
302         }
303 }
304
305 static bool winbindd_setup_sig_chld_handler(void)
306 {
307         struct tevent_signal *se;
308
309         se = tevent_add_signal(winbind_event_context(),
310                                winbind_event_context(),
311                                SIGCHLD, 0,
312                                winbindd_sig_chld_handler,
313                                NULL);
314         if (!se) {
315                 return false;
316         }
317
318         return true;
319 }
320
321 static void winbindd_sig_usr2_handler(struct tevent_context *ev,
322                                       struct tevent_signal *se,
323                                       int signum,
324                                       int count,
325                                       void *siginfo,
326                                       void *private_data)
327 {
328         print_winbindd_status();
329 }
330
331 static bool winbindd_setup_sig_usr2_handler(void)
332 {
333         struct tevent_signal *se;
334
335         se = tevent_add_signal(winbind_event_context(),
336                                winbind_event_context(),
337                                SIGUSR2, 0,
338                                winbindd_sig_usr2_handler,
339                                NULL);
340         if (!se) {
341                 return false;
342         }
343
344         return true;
345 }
346
347 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
348 static void msg_reload_services(struct messaging_context *msg,
349                                 void *private_data,
350                                 uint32_t msg_type,
351                                 struct server_id server_id,
352                                 DATA_BLOB *data)
353 {
354         /* Flush various caches */
355         flush_caches();
356         reload_services_file((const char *) private_data);
357 }
358
359 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
360 static void msg_shutdown(struct messaging_context *msg,
361                          void *private_data,
362                          uint32_t msg_type,
363                          struct server_id server_id,
364                          DATA_BLOB *data)
365 {
366         /* only the parent waits for this message */
367         DEBUG(0,("Got shutdown message\n"));
368         terminate(true);
369 }
370
371
372 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
373                                        void *private_data,
374                                        uint32_t msg_type,
375                                        struct server_id server_id,
376                                        DATA_BLOB *data)
377 {
378         uint8 ret;
379         pid_t child_pid;
380
381         DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
382                    "message.\n"));
383
384         /*
385          * call the validation code from a child:
386          * so we don't block the main winbindd and the validation
387          * code can safely use fork/waitpid...
388          */
389         child_pid = sys_fork();
390
391         if (child_pid == -1) {
392                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
393                           strerror(errno)));
394                 return;
395         }
396
397         if (child_pid != 0) {
398                 /* parent */
399                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
400                           "pid %d.\n", (int)child_pid));
401                 return;
402         }
403
404         /* child */
405
406         if (!winbindd_reinit_after_fork(NULL)) {
407                 _exit(0);
408         }
409
410         /* install default SIGCHLD handler: validation code uses fork/waitpid */
411         CatchSignal(SIGCHLD, SIG_DFL);
412
413         ret = (uint8)winbindd_validate_cache_nobackup();
414         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
415         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
416                            (size_t)1);
417         _exit(0);
418 }
419
420 static struct winbindd_dispatch_table {
421         enum winbindd_cmd cmd;
422         void (*fn)(struct winbindd_cli_state *state);
423         const char *winbindd_cmd_name;
424 } dispatch_table[] = {
425
426         /* Enumeration functions */
427
428         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
429           "LIST_TRUSTDOM" },
430
431         /* Miscellaneous */
432
433         { WINBINDD_INFO, winbindd_info, "INFO" },
434         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
435           "INTERFACE_VERSION" },
436         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
437         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
438         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
439         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
440           "WINBINDD_PRIV_PIPE_DIR" },
441
442         /* Credential cache access */
443         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
444         { WINBINDD_CCACHE_SAVE, winbindd_ccache_save, "CCACHE_SAVE" },
445
446         /* WINS functions */
447
448         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
449         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
450
451         /* End of list */
452
453         { WINBINDD_NUM_CMDS, NULL, "NONE" }
454 };
455
456 struct winbindd_async_dispatch_table {
457         enum winbindd_cmd cmd;
458         const char *cmd_name;
459         struct tevent_req *(*send_req)(TALLOC_CTX *mem_ctx,
460                                        struct tevent_context *ev,
461                                        struct winbindd_cli_state *cli,
462                                        struct winbindd_request *request);
463         NTSTATUS (*recv_req)(struct tevent_req *req,
464                              struct winbindd_response *presp);
465 };
466
467 static struct winbindd_async_dispatch_table async_nonpriv_table[] = {
468         { WINBINDD_PING, "PING",
469           wb_ping_send, wb_ping_recv },
470         { WINBINDD_LOOKUPSID, "LOOKUPSID",
471           winbindd_lookupsid_send, winbindd_lookupsid_recv },
472         { WINBINDD_LOOKUPNAME, "LOOKUPNAME",
473           winbindd_lookupname_send, winbindd_lookupname_recv },
474         { WINBINDD_SID_TO_UID, "SID_TO_UID",
475           winbindd_sid_to_uid_send, winbindd_sid_to_uid_recv },
476         { WINBINDD_SID_TO_GID, "SID_TO_GID",
477           winbindd_sid_to_gid_send, winbindd_sid_to_gid_recv },
478         { WINBINDD_UID_TO_SID, "UID_TO_SID",
479           winbindd_uid_to_sid_send, winbindd_uid_to_sid_recv },
480         { WINBINDD_GID_TO_SID, "GID_TO_SID",
481           winbindd_gid_to_sid_send, winbindd_gid_to_sid_recv },
482         { WINBINDD_GETPWSID, "GETPWSID",
483           winbindd_getpwsid_send, winbindd_getpwsid_recv },
484         { WINBINDD_GETPWNAM, "GETPWNAM",
485           winbindd_getpwnam_send, winbindd_getpwnam_recv },
486         { WINBINDD_GETPWUID, "GETPWUID",
487           winbindd_getpwuid_send, winbindd_getpwuid_recv },
488         { WINBINDD_GETSIDALIASES, "GETSIDALIASES",
489           winbindd_getsidaliases_send, winbindd_getsidaliases_recv },
490         { WINBINDD_GETUSERDOMGROUPS, "GETUSERDOMGROUPS",
491           winbindd_getuserdomgroups_send, winbindd_getuserdomgroups_recv },
492         { WINBINDD_GETGROUPS, "GETGROUPS",
493           winbindd_getgroups_send, winbindd_getgroups_recv },
494         { WINBINDD_SHOW_SEQUENCE, "SHOW_SEQUENCE",
495           winbindd_show_sequence_send, winbindd_show_sequence_recv },
496         { WINBINDD_GETGRGID, "GETGRGID",
497           winbindd_getgrgid_send, winbindd_getgrgid_recv },
498         { WINBINDD_GETGRNAM, "GETGRNAM",
499           winbindd_getgrnam_send, winbindd_getgrnam_recv },
500         { WINBINDD_GETUSERSIDS, "GETUSERSIDS",
501           winbindd_getusersids_send, winbindd_getusersids_recv },
502         { WINBINDD_LOOKUPRIDS, "LOOKUPRIDS",
503           winbindd_lookuprids_send, winbindd_lookuprids_recv },
504         { WINBINDD_SETPWENT, "SETPWENT",
505           winbindd_setpwent_send, winbindd_setpwent_recv },
506         { WINBINDD_GETPWENT, "GETPWENT",
507           winbindd_getpwent_send, winbindd_getpwent_recv },
508         { WINBINDD_ENDPWENT, "ENDPWENT",
509           winbindd_endpwent_send, winbindd_endpwent_recv },
510         { WINBINDD_DSGETDCNAME, "DSGETDCNAME",
511           winbindd_dsgetdcname_send, winbindd_dsgetdcname_recv },
512         { WINBINDD_GETDCNAME, "GETDCNAME",
513           winbindd_getdcname_send, winbindd_getdcname_recv },
514         { WINBINDD_SETGRENT, "SETGRENT",
515           winbindd_setgrent_send, winbindd_setgrent_recv },
516         { WINBINDD_GETGRENT, "GETGRENT",
517           winbindd_getgrent_send, winbindd_getgrent_recv },
518         { WINBINDD_ENDGRENT, "ENDGRENT",
519           winbindd_endgrent_send, winbindd_endgrent_recv },
520         { WINBINDD_LIST_USERS, "LIST_USERS",
521           winbindd_list_users_send, winbindd_list_users_recv },
522         { WINBINDD_LIST_GROUPS, "LIST_GROUPS",
523           winbindd_list_groups_send, winbindd_list_groups_recv },
524         { WINBINDD_CHECK_MACHACC, "CHECK_MACHACC",
525           winbindd_check_machine_acct_send, winbindd_check_machine_acct_recv },
526         { WINBINDD_PING_DC, "PING_DC",
527           winbindd_ping_dc_send, winbindd_ping_dc_recv },
528         { WINBINDD_PAM_AUTH, "PAM_AUTH",
529           winbindd_pam_auth_send, winbindd_pam_auth_recv },
530         { WINBINDD_PAM_LOGOFF, "PAM_LOGOFF",
531           winbindd_pam_logoff_send, winbindd_pam_logoff_recv },
532         { WINBINDD_PAM_CHAUTHTOK, "PAM_CHAUTHTOK",
533           winbindd_pam_chauthtok_send, winbindd_pam_chauthtok_recv },
534         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, "PAM_CHNG_PSWD_AUTH_CRAP",
535           winbindd_pam_chng_pswd_auth_crap_send,
536           winbindd_pam_chng_pswd_auth_crap_recv },
537
538         { 0, NULL, NULL, NULL }
539 };
540
541 static struct winbindd_async_dispatch_table async_priv_table[] = {
542         { WINBINDD_ALLOCATE_UID, "ALLOCATE_UID",
543           winbindd_allocate_uid_send, winbindd_allocate_uid_recv },
544         { WINBINDD_ALLOCATE_GID, "ALLOCATE_GID",
545           winbindd_allocate_gid_send, winbindd_allocate_gid_recv },
546         { WINBINDD_CHANGE_MACHACC, "CHANGE_MACHACC",
547           winbindd_change_machine_acct_send, winbindd_change_machine_acct_recv },
548         { WINBINDD_PAM_AUTH_CRAP, "PAM_AUTH_CRAP",
549           winbindd_pam_auth_crap_send, winbindd_pam_auth_crap_recv },
550
551         { 0, NULL, NULL, NULL }
552 };
553
554 static void wb_request_done(struct tevent_req *req);
555
556 static void process_request(struct winbindd_cli_state *state)
557 {
558         struct winbindd_dispatch_table *table = dispatch_table;
559         struct winbindd_async_dispatch_table *atable;
560
561         state->mem_ctx = talloc_named(state, 0, "winbind request");
562         if (state->mem_ctx == NULL)
563                 return;
564
565         /* Remember who asked us. */
566         state->pid = state->request->pid;
567
568         state->cmd_name = "unknown request";
569         state->recv_fn = NULL;
570
571         /* Process command */
572
573         for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
574                 if (state->request->cmd == atable->cmd) {
575                         break;
576                 }
577         }
578
579         if ((atable->send_req == NULL) && state->privileged) {
580                 for (atable = async_priv_table; atable->send_req;
581                      atable += 1) {
582                         if (state->request->cmd == atable->cmd) {
583                                 break;
584                         }
585                 }
586         }
587
588         if (atable->send_req != NULL) {
589                 struct tevent_req *req;
590
591                 state->cmd_name = atable->cmd_name;
592                 state->recv_fn = atable->recv_req;
593
594                 DEBUG(10, ("process_request: Handling async request %d:%s\n",
595                            (int)state->pid, state->cmd_name));
596
597                 req = atable->send_req(state->mem_ctx, winbind_event_context(),
598                                        state, state->request);
599                 if (req == NULL) {
600                         DEBUG(0, ("process_request: atable->send failed for "
601                                   "%s\n", atable->cmd_name));
602                         request_error(state);
603                         return;
604                 }
605                 tevent_req_set_callback(req, wb_request_done, state);
606                 return;
607         }
608
609         state->response = talloc_zero(state->mem_ctx,
610                                       struct winbindd_response);
611         if (state->response == NULL) {
612                 DEBUG(10, ("talloc failed\n"));
613                 remove_client(state);
614                 return;
615         }
616         state->response->result = WINBINDD_PENDING;
617         state->response->length = sizeof(struct winbindd_response);
618
619         for (table = dispatch_table; table->fn; table++) {
620                 if (state->request->cmd == table->cmd) {
621                         DEBUG(10,("process_request: request fn %s\n",
622                                   table->winbindd_cmd_name ));
623                         state->cmd_name = table->winbindd_cmd_name;
624                         table->fn(state);
625                         break;
626                 }
627         }
628
629         if (!table->fn) {
630                 DEBUG(10,("process_request: unknown request fn number %d\n",
631                           (int)state->request->cmd ));
632                 request_error(state);
633         }
634 }
635
636 static void wb_request_done(struct tevent_req *req)
637 {
638         struct winbindd_cli_state *state = tevent_req_callback_data(
639                 req, struct winbindd_cli_state);
640         NTSTATUS status;
641
642         state->response = talloc_zero(state->mem_ctx,
643                                       struct winbindd_response);
644         if (state->response == NULL) {
645                 DEBUG(0, ("wb_request_done[%d:%s]: talloc_zero failed - removing client\n",
646                           (int)state->pid, state->cmd_name));
647                 remove_client(state);
648                 return;
649         }
650         state->response->result = WINBINDD_PENDING;
651         state->response->length = sizeof(struct winbindd_response);
652
653         status = state->recv_fn(req, state->response);
654         TALLOC_FREE(req);
655
656         DEBUG(10,("wb_request_done[%d:%s]: %s\n",
657                   (int)state->pid, state->cmd_name, nt_errstr(status)));
658
659         if (!NT_STATUS_IS_OK(status)) {
660                 request_error(state);
661                 return;
662         }
663         request_ok(state);
664 }
665
666 /*
667  * This is the main event loop of winbind requests. It goes through a
668  * state-machine of 3 read/write requests, 4 if you have extra data to send.
669  *
670  * An idle winbind client has a read request of 4 bytes outstanding,
671  * finalizing function is request_len_recv, checking the length. request_recv
672  * then processes the packet. The processing function then at some point has
673  * to call request_finished which schedules sending the response.
674  */
675
676 static void request_finished(struct winbindd_cli_state *state);
677
678 static void winbind_client_request_read(struct tevent_req *req);
679 static void winbind_client_response_written(struct tevent_req *req);
680
681 static void request_finished(struct winbindd_cli_state *state)
682 {
683         struct tevent_req *req;
684
685         TALLOC_FREE(state->request);
686
687         req = wb_resp_write_send(state, winbind_event_context(),
688                                  state->out_queue, state->sock,
689                                  state->response);
690         if (req == NULL) {
691                 DEBUG(10,("request_finished[%d:%s]: wb_resp_write_send() failed\n",
692                           (int)state->pid, state->cmd_name));
693                 remove_client(state);
694                 return;
695         }
696         tevent_req_set_callback(req, winbind_client_response_written, state);
697 }
698
699 static void winbind_client_response_written(struct tevent_req *req)
700 {
701         struct winbindd_cli_state *state = tevent_req_callback_data(
702                 req, struct winbindd_cli_state);
703         ssize_t ret;
704         int err;
705
706         ret = wb_resp_write_recv(req, &err);
707         TALLOC_FREE(req);
708         if (ret == -1) {
709                 close(state->sock);
710                 state->sock = -1;
711                 DEBUG(2, ("Could not write response[%d:%s] to client: %s\n",
712                           (int)state->pid, state->cmd_name, strerror(err)));
713                 remove_client(state);
714                 return;
715         }
716
717         DEBUG(10,("winbind_client_response_written[%d:%s]: delivered response "
718                   "to client\n", (int)state->pid, state->cmd_name));
719
720         TALLOC_FREE(state->mem_ctx);
721         state->response = NULL;
722         state->cmd_name = "no request";
723         state->recv_fn = NULL;
724
725         req = wb_req_read_send(state, winbind_event_context(), state->sock,
726                                WINBINDD_MAX_EXTRA_DATA);
727         if (req == NULL) {
728                 remove_client(state);
729                 return;
730         }
731         tevent_req_set_callback(req, winbind_client_request_read, state);
732 }
733
734 void request_error(struct winbindd_cli_state *state)
735 {
736         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
737         state->response->result = WINBINDD_ERROR;
738         request_finished(state);
739 }
740
741 void request_ok(struct winbindd_cli_state *state)
742 {
743         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
744         state->response->result = WINBINDD_OK;
745         request_finished(state);
746 }
747
748 /* Process a new connection by adding it to the client connection list */
749
750 static void new_connection(int listen_sock, bool privileged)
751 {
752         struct sockaddr_un sunaddr;
753         struct winbindd_cli_state *state;
754         struct tevent_req *req;
755         socklen_t len;
756         int sock;
757
758         /* Accept connection */
759
760         len = sizeof(sunaddr);
761
762         do {
763                 sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr,
764                               &len);
765         } while (sock == -1 && errno == EINTR);
766
767         if (sock == -1)
768                 return;
769
770         DEBUG(6,("accepted socket %d\n", sock));
771
772         /* Create new connection structure */
773
774         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
775                 close(sock);
776                 return;
777         }
778
779         state->sock = sock;
780
781         state->out_queue = tevent_queue_create(state, "winbind client reply");
782         if (state->out_queue == NULL) {
783                 close(sock);
784                 TALLOC_FREE(state);
785                 return;
786         }
787
788         state->last_access = time(NULL);        
789
790         state->privileged = privileged;
791
792         req = wb_req_read_send(state, winbind_event_context(), state->sock,
793                                WINBINDD_MAX_EXTRA_DATA);
794         if (req == NULL) {
795                 TALLOC_FREE(state);
796                 close(sock);
797                 return;
798         }
799         tevent_req_set_callback(req, winbind_client_request_read, state);
800
801         /* Add to connection list */
802
803         winbindd_add_client(state);
804 }
805
806 static void winbind_client_request_read(struct tevent_req *req)
807 {
808         struct winbindd_cli_state *state = tevent_req_callback_data(
809                 req, struct winbindd_cli_state);
810         ssize_t ret;
811         int err;
812
813         ret = wb_req_read_recv(req, state, &state->request, &err);
814         TALLOC_FREE(req);
815         if (ret == -1) {
816                 if (err == EPIPE) {
817                         DEBUG(6, ("closing socket %d, client exited\n",
818                                   state->sock));
819                 } else {
820                         DEBUG(2, ("Could not read client request from fd %d: "
821                                   "%s\n", state->sock, strerror(err)));
822                 }
823                 close(state->sock);
824                 state->sock = -1;
825                 remove_client(state);
826                 return;
827         }
828         process_request(state);
829 }
830
831 /* Remove a client connection from client connection list */
832
833 static void remove_client(struct winbindd_cli_state *state)
834 {
835         char c = 0;
836         int nwritten;
837
838         /* It's a dead client - hold a funeral */
839
840         if (state == NULL) {
841                 return;
842         }
843
844         if (state->sock != -1) {
845                 /* tell client, we are closing ... */
846                 nwritten = write(state->sock, &c, sizeof(c));
847                 if (nwritten == -1) {
848                         DEBUG(2, ("final write to client failed: %s\n",
849                                 strerror(errno)));
850                 }
851
852                 /* Close socket */
853
854                 close(state->sock);
855                 state->sock = -1;
856         }
857
858         TALLOC_FREE(state->mem_ctx);
859
860         /* Remove from list and free */
861
862         winbindd_remove_client(state);
863         TALLOC_FREE(state);
864 }
865
866 /* Shutdown client connection which has been idle for the longest time */
867
868 static bool remove_idle_client(void)
869 {
870         struct winbindd_cli_state *state, *remove_state = NULL;
871         time_t last_access = 0;
872         int nidle = 0;
873
874         for (state = winbindd_client_list(); state; state = state->next) {
875                 if (state->response == NULL &&
876                     !state->pwent_state && !state->grent_state) {
877                         nidle++;
878                         if (!last_access || state->last_access < last_access) {
879                                 last_access = state->last_access;
880                                 remove_state = state;
881                         }
882                 }
883         }
884
885         if (remove_state) {
886                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
887                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
888                 remove_client(remove_state);
889                 return True;
890         }
891
892         return False;
893 }
894
895 struct winbindd_listen_state {
896         bool privileged;
897         int fd;
898 };
899
900 static void winbindd_listen_fde_handler(struct tevent_context *ev,
901                                         struct tevent_fd *fde,
902                                         uint16_t flags,
903                                         void *private_data)
904 {
905         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
906                                           struct winbindd_listen_state);
907
908         while (winbindd_num_clients() >
909                WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
910                 DEBUG(5,("winbindd: Exceeding %d client "
911                          "connections, removing idle "
912                          "connection.\n",
913                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
914                 if (!remove_idle_client()) {
915                         DEBUG(0,("winbindd: Exceeding %d "
916                                  "client connections, no idle "
917                                  "connection found\n",
918                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
919                         break;
920                 }
921         }
922         new_connection(s->fd, s->privileged);
923 }
924
925 /*
926  * Winbindd socket accessor functions
927  */
928
929 const char *get_winbind_pipe_dir(void)
930 {
931         return lp_parm_const_string(-1, "winbindd", "socket dir", WINBINDD_SOCKET_DIR);
932 }
933
934 char *get_winbind_priv_pipe_dir(void)
935 {
936         return lock_path(WINBINDD_PRIV_SOCKET_SUBDIR);
937 }
938
939 static bool winbindd_setup_listeners(void)
940 {
941         struct winbindd_listen_state *pub_state = NULL;
942         struct winbindd_listen_state *priv_state = NULL;
943         struct tevent_fd *fde;
944
945         pub_state = talloc(winbind_event_context(),
946                            struct winbindd_listen_state);
947         if (!pub_state) {
948                 goto failed;
949         }
950
951         pub_state->privileged = false;
952         pub_state->fd = create_pipe_sock(
953                 get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME, 0755);
954         if (pub_state->fd == -1) {
955                 goto failed;
956         }
957
958         fde = tevent_add_fd(winbind_event_context(), pub_state, pub_state->fd,
959                             TEVENT_FD_READ, winbindd_listen_fde_handler,
960                             pub_state);
961         if (fde == NULL) {
962                 close(pub_state->fd);
963                 goto failed;
964         }
965         tevent_fd_set_auto_close(fde);
966
967         priv_state = talloc(winbind_event_context(),
968                             struct winbindd_listen_state);
969         if (!priv_state) {
970                 goto failed;
971         }
972
973         priv_state->privileged = true;
974         priv_state->fd = create_pipe_sock(
975                 get_winbind_priv_pipe_dir(), WINBINDD_SOCKET_NAME, 0750);
976         if (priv_state->fd == -1) {
977                 goto failed;
978         }
979
980         fde = tevent_add_fd(winbind_event_context(), priv_state,
981                             priv_state->fd, TEVENT_FD_READ,
982                             winbindd_listen_fde_handler, priv_state);
983         if (fde == NULL) {
984                 close(priv_state->fd);
985                 goto failed;
986         }
987         tevent_fd_set_auto_close(fde);
988
989         return true;
990 failed:
991         TALLOC_FREE(pub_state);
992         TALLOC_FREE(priv_state);
993         return false;
994 }
995
996 bool winbindd_use_idmap_cache(void)
997 {
998         return !opt_nocache;
999 }
1000
1001 bool winbindd_use_cache(void)
1002 {
1003         return !opt_nocache;
1004 }
1005
1006 void winbindd_register_handlers(void)
1007 {
1008         struct tevent_timer *te;
1009         /* Setup signal handlers */
1010
1011         if (!winbindd_setup_sig_term_handler(true))
1012                 exit(1);
1013         if (!winbindd_setup_sig_hup_handler(NULL))
1014                 exit(1);
1015         if (!winbindd_setup_sig_chld_handler())
1016                 exit(1);
1017         if (!winbindd_setup_sig_usr2_handler())
1018                 exit(1);
1019
1020         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1021
1022         /*
1023          * Ensure all cache and idmap caches are consistent
1024          * and initialized before we startup.
1025          */
1026         if (!winbindd_cache_validate_and_initialize()) {
1027                 exit(1);
1028         }
1029
1030         /* get broadcast messages */
1031
1032         if (!serverid_register(procid_self(),
1033                                FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP)) {
1034                 DEBUG(1, ("Could not register myself in serverid.tdb\n"));
1035                 exit(1);
1036         }
1037
1038         /* React on 'smbcontrol winbindd reload-config' in the same way
1039            as to SIGHUP signal */
1040         messaging_register(winbind_messaging_context(), NULL,
1041                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1042         messaging_register(winbind_messaging_context(), NULL,
1043                            MSG_SHUTDOWN, msg_shutdown);
1044
1045         /* Handle online/offline messages. */
1046         messaging_register(winbind_messaging_context(), NULL,
1047                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1048         messaging_register(winbind_messaging_context(), NULL,
1049                            MSG_WINBIND_ONLINE, winbind_msg_online);
1050         messaging_register(winbind_messaging_context(), NULL,
1051                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1052
1053         messaging_register(winbind_messaging_context(), NULL,
1054                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1055
1056         messaging_register(winbind_messaging_context(), NULL,
1057                            MSG_WINBIND_VALIDATE_CACHE,
1058                            winbind_msg_validate_cache);
1059
1060         messaging_register(winbind_messaging_context(), NULL,
1061                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1062                            winbind_msg_dump_domain_list);
1063
1064         /* Register handler for MSG_DEBUG. */
1065         messaging_register(winbind_messaging_context(), NULL,
1066                            MSG_DEBUG,
1067                            winbind_msg_debug);
1068
1069         netsamlogon_cache_init(); /* Non-critical */
1070
1071         /* clear the cached list of trusted domains */
1072
1073         wcache_tdc_clear();
1074
1075         if (!init_domain_list()) {
1076                 DEBUG(0,("unable to initialize domain list\n"));
1077                 exit(1);
1078         }
1079
1080         init_idmap_child();
1081         init_locator_child();
1082
1083         smb_nscd_flush_user_cache();
1084         smb_nscd_flush_group_cache();
1085
1086         te = tevent_add_timer(winbind_event_context(), NULL, timeval_zero(),
1087                               rescan_trusted_domains, NULL);
1088         if (te == NULL) {
1089                 DEBUG(0, ("Could not trigger rescan_trusted_domains()\n"));
1090                 exit(1);
1091         }
1092
1093 }
1094
1095 /* Main function */
1096
1097 int main(int argc, char **argv, char **envp)
1098 {
1099         static bool is_daemon = False;
1100         static bool Fork = True;
1101         static bool log_stdout = False;
1102         static bool no_process_group = False;
1103         enum {
1104                 OPT_DAEMON = 1000,
1105                 OPT_FORK,
1106                 OPT_NO_PROCESS_GROUP,
1107                 OPT_LOG_STDOUT
1108         };
1109         struct poptOption long_options[] = {
1110                 POPT_AUTOHELP
1111                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1112                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1113                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1114                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1115                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1116                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1117                 POPT_COMMON_SAMBA
1118                 POPT_TABLEEND
1119         };
1120         poptContext pc;
1121         int opt;
1122         TALLOC_CTX *frame = talloc_stackframe();
1123         NTSTATUS status;
1124
1125         /* glibc (?) likes to print "User defined signal 1" and exit if a
1126            SIGUSR[12] is received before a handler is installed */
1127
1128         CatchSignal(SIGUSR1, SIG_IGN);
1129         CatchSignal(SIGUSR2, SIG_IGN);
1130
1131         fault_setup((void (*)(void *))fault_quit );
1132         dump_core_setup("winbindd");
1133
1134         load_case_tables();
1135
1136         /* Initialise for running in non-root mode */
1137
1138         sec_init();
1139
1140         set_remote_machine_name("winbindd", False);
1141
1142         /* Set environment variable so we don't recursively call ourselves.
1143            This may also be useful interactively. */
1144
1145         if ( !winbind_off() ) {
1146                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1147                 exit(1);
1148         }
1149
1150         /* Initialise samba/rpc client stuff */
1151
1152         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1153
1154         while ((opt = poptGetNextOpt(pc)) != -1) {
1155                 switch (opt) {
1156                         /* Don't become a daemon */
1157                 case OPT_DAEMON:
1158                         is_daemon = True;
1159                         break;
1160                 case 'i':
1161                         interactive = True;
1162                         log_stdout = True;
1163                         Fork = False;
1164                         break;
1165                 case OPT_FORK:
1166                         Fork = false;
1167                         break;
1168                 case OPT_NO_PROCESS_GROUP:
1169                         no_process_group = true;
1170                         break;
1171                 case OPT_LOG_STDOUT:
1172                         log_stdout = true;
1173                         break;
1174                 case 'n':
1175                         opt_nocache = true;
1176                         break;
1177                 default:
1178                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1179                                   poptBadOption(pc, 0), poptStrerror(opt));
1180                         poptPrintUsage(pc, stderr, 0);
1181                         exit(1);
1182                 }
1183         }
1184
1185         if (is_daemon && interactive) {
1186                 d_fprintf(stderr,"\nERROR: "
1187                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1188                 poptPrintUsage(pc, stderr, 0);
1189                 exit(1);
1190         }
1191
1192         if (log_stdout && Fork) {
1193                 d_fprintf(stderr, "\nERROR: "
1194                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1195                 poptPrintUsage(pc, stderr, 0);
1196                 exit(1);
1197         }
1198
1199         poptFreeContext(pc);
1200
1201         if (!override_logfile) {
1202                 char *lfile = NULL;
1203                 if (asprintf(&lfile,"%s/log.winbindd",
1204                                 get_dyn_LOGFILEBASE()) > 0) {
1205                         lp_set_logfile(lfile);
1206                         SAFE_FREE(lfile);
1207                 }
1208         }
1209         setup_logging("winbindd", log_stdout);
1210         reopen_logs();
1211
1212         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1213         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1214
1215         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1216                 DEBUG(0, ("error opening config file\n"));
1217                 exit(1);
1218         }
1219
1220         /* Initialise messaging system */
1221
1222         if (winbind_messaging_context() == NULL) {
1223                 exit(1);
1224         }
1225
1226         if (!reload_services_file(NULL)) {
1227                 DEBUG(0, ("error opening config file\n"));
1228                 exit(1);
1229         }
1230
1231         if (!directory_exist(lp_lockdir())) {
1232                 mkdir(lp_lockdir(), 0755);
1233         }
1234
1235         /* Setup names. */
1236
1237         if (!init_names())
1238                 exit(1);
1239
1240         load_interfaces();
1241
1242         if (!secrets_init()) {
1243
1244                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1245                 return False;
1246         }
1247
1248         /* Unblock all signals we are interested in as they may have been
1249            blocked by the parent process. */
1250
1251         BlockSignals(False, SIGINT);
1252         BlockSignals(False, SIGQUIT);
1253         BlockSignals(False, SIGTERM);
1254         BlockSignals(False, SIGUSR1);
1255         BlockSignals(False, SIGUSR2);
1256         BlockSignals(False, SIGHUP);
1257         BlockSignals(False, SIGCHLD);
1258
1259         if (!interactive)
1260                 become_daemon(Fork, no_process_group, log_stdout);
1261
1262         pidfile_create("winbindd");
1263
1264 #if HAVE_SETPGID
1265         /*
1266          * If we're interactive we want to set our own process group for
1267          * signal management.
1268          */
1269         if (interactive && !no_process_group)
1270                 setpgid( (pid_t)0, (pid_t)0);
1271 #endif
1272
1273         TimeInit();
1274
1275         /* Don't use winbindd_reinit_after_fork here as
1276          * we're just starting up and haven't created any
1277          * winbindd-specific resources we must free yet. JRA.
1278          */
1279
1280         status = reinit_after_fork(winbind_messaging_context(),
1281                                    winbind_event_context(),
1282                                    procid_self(), false);
1283         if (!NT_STATUS_IS_OK(status)) {
1284                 DEBUG(0,("reinit_after_fork() failed\n"));
1285                 exit(1);
1286         }
1287
1288         winbindd_register_handlers();
1289
1290         rpc_lsarpc_init(NULL);
1291         rpc_samr_init(NULL);
1292
1293         if (!init_system_info()) {
1294                 DEBUG(0,("ERROR: failed to setup system user info.\n"));
1295                 exit(1);
1296         }
1297
1298         /* setup listen sockets */
1299
1300         if (!winbindd_setup_listeners()) {
1301                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1302                 exit(1);
1303         }
1304
1305         TALLOC_FREE(frame);
1306         /* Loop waiting for requests */
1307         while (1) {
1308                 frame = talloc_stackframe();
1309
1310                 if (tevent_loop_once(winbind_event_context()) == -1) {
1311                         DEBUG(1, ("tevent_loop_once() failed: %s\n",
1312                                   strerror(errno)));
1313                         return 1;
1314                 }
1315
1316                 TALLOC_FREE(frame);
1317         }
1318
1319         return 0;
1320 }