* There is now a dedicated thread for doing database checkpoints.
[citadel.git] / citadel / citserver.c
1 /* 
2  * $Id$
3  *
4  * Main source module for the Citadel server
5  *
6  */
7
8 #ifdef DLL_EXPORT
9 #define IN_LIBCIT
10 #endif
11
12 #include "sysdep.h"
13 #include <stdlib.h>
14 #include <unistd.h>
15 #include <stdio.h>
16 #include <fcntl.h>
17 #include <signal.h>
18 #include <sys/types.h>
19 #include <sys/stat.h>
20
21
22 #if TIME_WITH_SYS_TIME
23 # include <sys/time.h>
24 # include <time.h>
25 #else
26 # if HAVE_SYS_TIME_H
27 #  include <sys/time.h>
28 # else
29 #  include <time.h>
30 # endif
31 #endif
32
33 #include <ctype.h>
34 #include <string.h>
35 #include <errno.h>
36 #include <limits.h>
37 /* #include <dlfcn.h> */
38 #include <netdb.h>
39 #include <sys/types.h>
40 #include <sys/socket.h>
41 #include <netinet/in.h>
42 #include <arpa/inet.h>
43 #include "citadel.h"
44 #include "server.h"
45 #include "serv_extensions.h"
46 #include "sysdep_decls.h"
47 #include "citserver.h"
48 #include "config.h"
49 #include "database.h"
50 #include "housekeeping.h"
51 #include "user_ops.h"
52 #include "msgbase.h"
53 #include "support.h"
54 #include "locate_host.h"
55 #include "room_ops.h"
56 #include "file_ops.h"
57 #include "policy.h"
58 #include "control.h"
59 #include "tools.h"
60
61 #ifndef HAVE_SNPRINTF
62 #include "snprintf.h"
63 #endif
64
65 struct CitContext *ContextList = NULL;
66 struct CitContext* next_session = NULL;
67 char *unique_session_numbers;
68 int ScheduledShutdown = 0;
69 int do_defrag = 0;
70 time_t server_startup_time;
71 char pid_file_name[PATH_MAX];
72
73 /*
74  * Various things that need to be initialized at startup
75  */
76 void master_startup(void) {
77         struct timeval tv;
78         unsigned int seed;
79         FILE *urandom;
80         struct ctdlroom qrbuf;
81         FILE *pidfile_fp;
82         
83         lprintf(CTDL_DEBUG, "master_startup() started\n");
84         time(&server_startup_time);
85
86         /* pid file.  If we go FSSTND this should end up in 'localstatedir' */
87         snprintf(pid_file_name, sizeof pid_file_name, "./citadel.pid");
88         pidfile_fp = fopen(pid_file_name, "w");
89         if (pidfile_fp != NULL) {
90                 fprintf(pidfile_fp, "%d\n", (int)getpid());
91                 fclose(pidfile_fp);
92         }
93
94         lprintf(CTDL_INFO, "Opening databases\n");
95         open_databases();
96
97         if (do_defrag) {
98                 defrag_databases();
99         }
100
101         check_ref_counts();
102
103         lprintf(CTDL_INFO, "Creating base rooms (if necessary)\n");
104         create_room(config.c_baseroom,  0, "", 0, 1, 0, VIEW_BBS);
105         create_room(AIDEROOM,           3, "", 0, 1, 0, VIEW_BBS);
106         create_room(SYSCONFIGROOM,      3, "", 0, 1, 0, VIEW_BBS);
107         create_room(config.c_twitroom,  0, "", 0, 1, 0, VIEW_BBS);
108
109         /* The "Local System Configuration" room doesn't need to be visible */
110         if (lgetroom(&qrbuf, SYSCONFIGROOM) == 0) {
111                 qrbuf.QRflags2 |= QR2_SYSTEM;
112                 lputroom(&qrbuf);
113         }
114
115         lprintf(CTDL_INFO, "Seeding the pseudo-random number generator...\n");
116         urandom = fopen("/dev/urandom", "r");
117         if (urandom != NULL) {
118                 fread(&seed, sizeof seed, 1, urandom);
119                 fclose(urandom);
120         }
121         else {
122                 gettimeofday(&tv, NULL);
123                 seed = tv.tv_usec;
124         }
125         srandom(seed);
126
127         lprintf(CTDL_INFO, "Initializing ipgm secret\n");
128         get_config();
129         config.c_ipgm_secret = rand();
130         put_config();
131
132         lprintf(CTDL_DEBUG, "master_startup() finished\n");
133 }
134
135
136 /*
137  * Cleanup routine to be called when the server is shutting down.
138  */
139 void master_cleanup(int exitcode) {
140         struct CleanupFunctionHook *fcn;
141         static int already_cleaning_up = 0;
142
143         if (already_cleaning_up) while(1) sleep(1);
144         already_cleaning_up = 1;
145
146         /* Run any cleanup routines registered by loadable modules */
147         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
148                 (*fcn->h_function_pointer)();
149         }
150
151         /* Shut down the indexer thread */
152         lprintf(CTDL_INFO, "Waiting for the indexer thread to shut down\n");
153         pthread_join(indexer_thread_tid, NULL);
154
155         /* Shut down the checkpoint thread */
156         lprintf(CTDL_INFO, "Waiting for the checkpoint thread to shut down\n");
157         pthread_join(checkpoint_thread_tid, NULL);
158
159         /* Close databases */
160         lprintf(CTDL_INFO, "Closing databases\n");
161         close_databases();
162
163         /* Do system-dependent stuff */
164         sysdep_master_cleanup();
165
166 #ifdef DEBUG_MEMORY_LEAKS
167         dump_heap();
168 #endif
169
170         /* Now go away. */
171         lprintf(CTDL_NOTICE, "citserver: Exiting with status %d\n", exitcode);
172         fflush(stdout); fflush(stderr);
173
174         unlink(pid_file_name);
175         exit(exitcode);
176 }
177
178
179
180 /*
181  * Terminate a session.
182  */
183 void RemoveContext (struct CitContext *con)
184 {
185         if (con==NULL) {
186                 lprintf(CTDL_ERR,
187                         "WARNING: RemoveContext() called with NULL!\n");
188                 return;
189         }
190         lprintf(CTDL_DEBUG, "RemoveContext() session %d\n", con->cs_pid);
191
192         /* Run any cleanup routines registered by loadable modules.
193          * Note: We have to "become_session()" because the cleanup functions
194          *       might make references to "CC" assuming it's the right one.
195          */
196         become_session(con);
197         PerformSessionHooks(EVT_STOP);
198         become_session(NULL);
199
200         /* Now handle all of the administrivia. */
201         lprintf(CTDL_DEBUG, "Calling logout(%d)\n", con->cs_pid);
202         logout(con);
203
204         lprintf(CTDL_NOTICE, "[%3d] Session ended.\n", con->cs_pid);
205
206         /* If the client is still connected, blow 'em away. */
207         lprintf(CTDL_DEBUG, "Closing socket %d\n", con->client_socket);
208         close(con->client_socket);
209
210         lprintf(CTDL_DEBUG, "Done with RemoveContext()\n");
211 }
212
213
214
215
216
217 /*
218  * cmd_info()  -  tell the client about this server
219  */
220 void cmd_info(void) {
221         cprintf("%d Server info:\n", LISTING_FOLLOWS);
222         cprintf("%d\n", CC->cs_pid);
223         cprintf("%s\n", config.c_nodename);
224         cprintf("%s\n", config.c_humannode);
225         cprintf("%s\n", config.c_fqdn);
226         cprintf("%s\n", CITADEL);
227         cprintf("%d\n", REV_LEVEL);
228         cprintf("%s\n", config.c_site_location);
229         cprintf("%s\n", config.c_sysadm);
230         cprintf("%d\n", SERVER_TYPE);
231         cprintf("%s\n", config.c_moreprompt);
232         cprintf("1\n"); /* 1 = yes, this system supports floors */
233         cprintf("1\n"); /* 1 = we support the extended paging options */
234         cprintf("%s\n", CC->cs_nonce);
235         cprintf("1\n"); /* 1 = yes, this system supports the QNOP command */
236 #ifdef HAVE_LDAP
237         cprintf("1\n"); /* 1 = yes, this server is LDAP-enabled */
238 #else
239         cprintf("0\n"); /* 1 = no, this server is not LDAP-enabled */
240 #endif
241         cprintf("000\n");
242 }
243
244
245 /*
246  * returns an asterisk if there are any instant messages waiting,
247  * space otherwise.
248  */
249 char CtdlCheckExpress(void) {
250         if (CC->FirstExpressMessage == NULL) {
251                 return(' ');
252         }
253         else {
254                 return('*');
255         }
256 }
257
258 void cmd_time(void)
259 {
260    time_t tv;
261    struct tm tmp;
262    
263    tv = time(NULL);
264    localtime_r(&tv, &tmp);
265    
266    /* timezone and daylight global variables are not portable. */
267 #ifdef HAVE_STRUCT_TM_TM_GMTOFF
268    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, tmp.tm_gmtoff, tmp.tm_isdst);
269 #else
270    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, timezone, tmp.tm_isdst);
271 #endif
272 }
273
274
275 /*
276  * Check originating host against the public_clients file.  This determines
277  * whether the client is allowed to change the hostname for this session
278  * (for example, to show the location of the user rather than the location
279  * of the client).
280  */
281 int is_public_client(void)
282 {
283         char buf[1024];
284         char addrbuf[1024];
285         FILE *fp;
286         int i;
287         struct stat statbuf;
288         static time_t pc_timestamp = 0;
289         static char public_clients[SIZ];
290
291 #define PUBLIC_CLIENTS "./public_clients"
292
293         /*
294          * Check the time stamp on the public_clients file.  If it's been
295          * updated since the last time we were here (or if this is the first
296          * time we've been through the loop), read its contents and learn
297          * the IP addresses of the listed hosts.
298          */
299         if (stat(PUBLIC_CLIENTS, &statbuf) != 0) {
300                 /* No public_clients file exists, so bail out */
301                 lprintf(CTDL_WARNING, "Warning: '%s' does not exist\n", PUBLIC_CLIENTS);
302                 return(0);
303         }
304
305         if (statbuf.st_mtime > pc_timestamp) {
306                 begin_critical_section(S_PUBLIC_CLIENTS);
307                 lprintf(CTDL_INFO, "Loading %s\n", PUBLIC_CLIENTS);
308
309                 safestrncpy(public_clients, "127.0.0.1", sizeof public_clients);
310                 if (hostname_to_dotted_quad(addrbuf, config.c_fqdn) == 0) {
311                         strcat(public_clients, "|");
312                         strcat(public_clients, addrbuf);
313                 }
314
315                 fp = fopen("public_clients", "r");
316                 if (fp != NULL) while (fgets(buf, sizeof buf, fp)!=NULL) {
317                         for (i=0; i<strlen(buf); ++i) {
318                                 if (buf[i] == '#') buf[i] = 0;
319                         }
320                         while (isspace((buf[strlen(buf)-1]))) {
321                                 buf[strlen(buf)-1] = 0;
322                         }
323                         if (hostname_to_dotted_quad(addrbuf, buf) == 0) {
324                                 if ((strlen(public_clients) +
325                                    strlen(addrbuf) + 2)
326                                    < sizeof(public_clients)) {
327                                         strcat(public_clients, addrbuf);
328                                 }
329                         }
330                 }
331                 fclose(fp);
332                 pc_timestamp = time(NULL);
333                 end_critical_section(S_PUBLIC_CLIENTS);
334         }
335
336         lprintf(CTDL_DEBUG, "Checking whether %s is a local or public client\n",
337                 CC->cs_addr);
338         for (i=0; i<num_parms(public_clients); ++i) {
339                 extract_token(addrbuf, public_clients, i, '|', sizeof addrbuf);
340                 if (!strcasecmp(CC->cs_addr, addrbuf)) {
341                         lprintf(CTDL_DEBUG, "... yes it is.\n");
342                         return(1);
343                 }
344         }
345
346         /* No hits.  This is not a public client. */
347         lprintf(CTDL_DEBUG, "... no it isn't.\n");
348         return(0);
349 }
350
351
352 /*
353  * the client is identifying itself to the server
354  */
355 void cmd_iden(char *argbuf)
356 {
357         int dev_code;
358         int cli_code;
359         int rev_level;
360         char desc[128];
361         char from_host[128];
362         struct in_addr addr;
363         int do_lookup = 0;
364
365         if (num_parms(argbuf)<4) {
366                 cprintf("%d usage error\n", ERROR + ILLEGAL_VALUE);
367                 return;
368         }
369
370         dev_code = extract_int(argbuf,0);
371         cli_code = extract_int(argbuf,1);
372         rev_level = extract_int(argbuf,2);
373         extract_token(desc, argbuf, 3, '|', sizeof desc);
374
375         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
376         from_host[sizeof from_host - 1] = 0;
377         if (num_parms(argbuf)>=5) extract_token(from_host, argbuf, 4, '|', sizeof from_host);
378
379         CC->cs_clientdev = dev_code;
380         CC->cs_clienttyp = cli_code;
381         CC->cs_clientver = rev_level;
382         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
383         CC->cs_clientname[31] = 0;
384
385         if (strlen(from_host) > 0) {
386                 if (CC->is_local_socket) do_lookup = 1;
387                 else if (is_public_client()) do_lookup = 1;
388         }
389
390         if (do_lookup) {
391                 lprintf(CTDL_DEBUG, "Looking up hostname '%s'\n", from_host);
392                 if ((addr.s_addr = inet_addr(from_host)) != -1) {
393                         locate_host(CC->cs_host, sizeof CC->cs_host,
394                                 NULL, 0,
395                                 &addr);
396                 }
397                 else {
398                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
399                         CC->cs_host[sizeof CC->cs_host - 1] = 0;
400                 }
401         }
402
403         lprintf(CTDL_NOTICE, "Client %d/%d/%01d.%02d (%s) from %s\n",
404                 dev_code,
405                 cli_code,
406                 (rev_level / 100),
407                 (rev_level % 100),
408                 desc,
409                 CC->cs_host);
410         cprintf("%d Ok\n",CIT_OK);
411 }
412
413
414 /*
415  * display system messages or help
416  */
417 void cmd_mesg(char *mname)
418 {
419         FILE *mfp;
420         char targ[256];
421         char buf[256];
422         char buf2[256];
423         char *dirs[2];
424
425         extract_token(buf, mname, 0, '|', sizeof buf);
426
427         dirs[0] = strdup("messages");
428         dirs[1] = strdup("help");
429         snprintf(buf2, sizeof buf2, "%s.%d.%d", buf, CC->cs_clientdev, CC->cs_clienttyp);
430         mesg_locate(targ, sizeof targ, buf2, 2, (const char **)dirs);
431         if (strlen(targ) == 0) {
432                 snprintf(buf2, sizeof buf2, "%s.%d", buf, CC->cs_clientdev);
433                 mesg_locate(targ, sizeof targ, buf2, 2, (const char **)dirs);
434                 if (strlen(targ) == 0) {
435                         mesg_locate(targ, sizeof targ, buf, 2, (const char **)dirs);
436                 }       
437         }
438         free(dirs[0]);
439         free(dirs[1]);
440
441         if (strlen(targ)==0) {
442                 cprintf("%d '%s' not found.\n",ERROR + FILE_NOT_FOUND, mname);
443                 return;
444         }
445
446         mfp = fopen(targ,"r");
447         if (mfp==NULL) {
448                 cprintf("%d Cannot open '%s': %s\n",
449                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
450                 return;
451         }
452         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
453
454         while (fgets(buf, (sizeof buf - 1), mfp) != NULL) {
455                 buf[strlen(buf)-1] = 0;
456                 do_help_subst(buf);
457                 cprintf("%s\n",buf);
458         }
459
460         fclose(mfp);
461         cprintf("000\n");
462 }
463
464
465 /*
466  * enter system messages or help
467  */
468 void cmd_emsg(char *mname)
469 {
470         FILE *mfp;
471         char targ[256];
472         char buf[256];
473         char *dirs[2];
474         int a;
475
476         unbuffer_output();
477
478         if (CtdlAccessCheck(ac_aide)) return;
479
480         extract_token(buf, mname, 0, '|', sizeof buf);
481         for (a=0; a<strlen(buf); ++a) {         /* security measure */
482                 if (buf[a] == '/') buf[a] = '.';
483         }
484
485         dirs[0] = strdup("messages");
486         dirs[1] = strdup("help");
487         mesg_locate(targ, sizeof targ, buf, 2, (const char**)dirs);
488         free(dirs[0]);
489         free(dirs[1]);
490
491         if (strlen(targ)==0) {
492                 snprintf(targ, sizeof targ, "./help/%s", buf);
493         }
494
495         mfp = fopen(targ,"w");
496         if (mfp==NULL) {
497                 cprintf("%d Cannot open '%s': %s\n",
498                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
499                 return;
500         }
501         cprintf("%d %s\n", SEND_LISTING, targ);
502
503         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
504                 fprintf(mfp, "%s\n", buf);
505         }
506
507         fclose(mfp);
508 }
509
510
511 /* Don't show the names of private rooms unless the viewing
512  * user also knows the rooms.
513  */
514 void GenerateRoomDisplay(char *real_room,
515                         struct CitContext *viewed,
516                         struct CitContext *viewer) {
517
518         int ra;
519
520         strcpy(real_room, viewed->room.QRname);
521         if (viewed->room.QRflags & QR_MAILBOX) {
522                 strcpy(real_room, &real_room[11]);
523         }
524         if (viewed->room.QRflags & QR_PRIVATE) {
525                 CtdlRoomAccess(&viewed->room, &viewer->user, &ra, NULL);
526                 if ( (ra & UA_KNOWN) == 0) {
527                         strcpy(real_room, "<private room>");
528                 }
529         }
530
531         if (viewed->cs_flags & CS_CHAT) {
532                 while (strlen(real_room) < 14)
533                         strcat(real_room, " ");
534
535                 strcpy(&real_room[14], "<chat>");
536         }
537
538 }
539
540 /*
541  * Convenience function.
542  */
543 int CtdlAccessCheck(int required_level) {
544
545         if (CC->internal_pgm) return(0);
546         if (required_level >= ac_internal) {
547                 cprintf("%d This is not a user-level command.\n",
548                         ERROR + HIGHER_ACCESS_REQUIRED);
549                 return(-1);
550         }
551
552         if ((required_level >= ac_logged_in) && (CC->logged_in == 0)) {
553                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
554                 return(-1);
555         }
556
557         if (CC->user.axlevel >= 6) return(0);
558         if (required_level >= ac_aide) {
559                 cprintf("%d This command requires Aide access.\n",
560                         ERROR + HIGHER_ACCESS_REQUIRED);
561                 return(-1);
562         }
563
564         if (is_room_aide()) return(0);
565         if (required_level >= ac_room_aide) {
566                 cprintf("%d This command requires Aide or Room Aide access.\n",
567                         ERROR + HIGHER_ACCESS_REQUIRED);
568                 return(-1);
569         }
570
571         /* shhh ... succeed quietly */
572         return(0);
573 }
574
575
576
577 /*
578  * Terminate another running session
579  */
580 void cmd_term(char *cmdbuf)
581 {
582         int session_num;
583         struct CitContext *ccptr;
584         int found_it = 0;
585         int allowed = 0;
586
587         session_num = extract_int(cmdbuf, 0);
588         if (session_num == CC->cs_pid) {
589                 cprintf("%d You can't kill your own session.\n", ERROR + ILLEGAL_VALUE);
590                 return;
591         }
592
593         lprintf(CTDL_DEBUG, "Locating session to kill\n");
594         begin_critical_section(S_SESSION_TABLE);
595         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
596                 if (session_num == ccptr->cs_pid) {
597                         found_it = 1;
598                         if ((ccptr->user.usernum == CC->user.usernum)
599                            || (CC->user.axlevel >= 6)) {
600                                 allowed = 1;
601                                 ccptr->kill_me = 1;
602                         }
603                         else {
604                                 allowed = 0;
605                         }
606                 }
607         }
608         end_critical_section(S_SESSION_TABLE);
609
610         if (found_it) {
611                 if (allowed) {
612                         cprintf("%d Session terminated.\n", CIT_OK);
613                 }
614                 else {
615                         cprintf("%d You are not allowed to do that.\n",
616                                 ERROR + HIGHER_ACCESS_REQUIRED);
617                 }
618         }
619         else {
620                 cprintf("%d No such session.\n", ERROR + ILLEGAL_VALUE);
621         }
622 }
623
624
625
626
627
628 /* 
629  * get the paginator prompt
630  */
631 void cmd_more(void) {
632         cprintf("%d %s\n", CIT_OK, config.c_moreprompt);
633 }
634
635 /*
636  * echo 
637  */
638 void cmd_echo(char *etext)
639 {
640         cprintf("%d %s\n", CIT_OK, etext);
641 }
642
643
644
645 /* 
646  * identify as internal program
647  */
648 void cmd_ipgm(char *argbuf)
649 {
650         int secret;
651
652         secret = extract_int(argbuf, 0);
653
654         /* For security reasons, we do NOT allow this command to run
655          * over the network.  Local sockets only.
656          */
657         if (!CC->is_local_socket) {
658                 sleep(5);
659                 cprintf("%d Authentication failed.\n",
660                         ERROR + PASSWORD_REQUIRED);
661         }
662         else if (secret == config.c_ipgm_secret) {
663                 CC->internal_pgm = 1;
664                 strcpy(CC->curr_user, "<internal program>");
665                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
666                 cprintf("%d Authenticated as an internal program.\n", CIT_OK);
667         }
668         else {
669                 sleep(5);
670                 cprintf("%d Authentication failed.\n",
671                         ERROR + PASSWORD_REQUIRED);
672                 lprintf(CTDL_ERR, "Warning: ipgm authentication failed.\n");
673                 CC->kill_me = 1;
674         }
675
676         /* Now change the ipgm secret for the next round.
677          * (Disabled because it breaks concurrent scripts.  The fact that
678          * we no longer accept IPGM over the network should be sufficient
679          * to prevent brute-force attacks.  If you don't agree, uncomment
680          * this block.)
681         get_config();
682         config.c_ipgm_secret = rand();
683         put_config();
684         */
685 }
686
687
688 /*
689  * Shut down the server
690  */
691 void cmd_down(void) {
692
693         if (CtdlAccessCheck(ac_aide)) return;
694
695         cprintf("%d Shutting down server.  Goodbye.\n", CIT_OK);
696         time_to_die = 1;
697 }
698
699 /*
700  * Schedule or cancel a server shutdown
701  */
702 void cmd_scdn(char *argbuf)
703 {
704         int new_state;
705
706         if (CtdlAccessCheck(ac_aide)) return;
707
708         new_state = extract_int(argbuf, 0);
709         if ((new_state == 0) || (new_state == 1)) {
710                 ScheduledShutdown = new_state;
711         }
712         cprintf("%d %d\n", CIT_OK, ScheduledShutdown);
713 }
714
715
716 /*
717  * Set or unset asynchronous protocol mode
718  */
719 void cmd_asyn(char *argbuf)
720 {
721         int new_state;
722
723         new_state = extract_int(argbuf, 0);
724         if ((new_state == 0) || (new_state == 1)) {
725                 CC->is_async = new_state;
726         }
727         cprintf("%d %d\n", CIT_OK, CC->is_async);
728 }
729
730
731 /*
732  * Generate a "nonce" for APOP-style authentication.
733  *
734  * RFC 1725 et al specify a PID to be placed in front of the nonce.
735  * Quoth BTX: That would be stupid.
736  */
737 void generate_nonce(struct CitContext *con) {
738         struct timeval tv;
739
740         memset(con->cs_nonce, NONCE_SIZE, 0);
741         gettimeofday(&tv, NULL);
742         memset(con->cs_nonce, NONCE_SIZE, 0);
743         snprintf(con->cs_nonce, NONCE_SIZE, "<%d%ld@%s>",
744                 rand(), (long)tv.tv_usec, config.c_fqdn);
745 }
746
747
748
749
750 /*
751  * Back-end function for starting a session
752  */
753 void begin_session(struct CitContext *con)
754 {
755         int len;
756         struct sockaddr_in sin;
757
758         /* 
759          * Initialize some variables specific to our context.
760          */
761         con->logged_in = 0;
762         con->internal_pgm = 0;
763         con->download_fp = NULL;
764         con->upload_fp = NULL;
765         con->FirstExpressMessage = NULL;
766         time(&con->lastcmd);
767         time(&con->lastidle);
768         strcpy(con->lastcmdname, "    ");
769         strcpy(con->cs_clientname, "(unknown)");
770         strcpy(con->curr_user, NLI);
771         strcpy(con->net_node, "");
772         strcpy(con->fake_username, "");
773         strcpy(con->fake_postname, "");
774         strcpy(con->fake_hostname, "");
775         strcpy(con->fake_roomname, "");
776         generate_nonce(con);
777         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
778         safestrncpy(con->cs_addr, "", sizeof con->cs_addr);
779         con->cs_host[sizeof con->cs_host - 1] = 0;
780         len = sizeof sin;
781         if (!CC->is_local_socket) {
782                 if (!getpeername(con->client_socket,
783                    (struct sockaddr *) &sin, &len))     /* should be socklen_t but doesn't work on Macintosh */
784                         locate_host(con->cs_host, sizeof con->cs_host,
785                                 con->cs_addr, sizeof con->cs_addr,
786                                 &sin.sin_addr);
787         }
788         else {
789                 strcpy(con->cs_host, "");
790         }
791         con->cs_flags = 0;
792         con->upload_type = UPL_FILE;
793         con->dl_is_net = 0;
794
795         con->nologin = 0;
796         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
797                 con->nologin = 1;
798
799         lprintf(CTDL_NOTICE, "Session started.\n");
800
801         /* Run any session startup routines registered by loadable modules */
802         PerformSessionHooks(EVT_START);
803 }
804
805
806 void citproto_begin_session() {
807         if (CC->nologin==1) {
808                 cprintf("%d %s: Too many users are already online "
809                         "(maximum is %d)\n",
810                         ERROR + MAX_SESSIONS_EXCEEDED,
811                         config.c_nodename, config.c_maxsessions);
812         }
813         else {
814                 cprintf("%d %s Citadel server ready.\n",
815                         CIT_OK, config.c_nodename);
816         }
817 }
818
819
820
821
822 /*
823  * This loop recognizes all server commands.
824  */
825 void do_command_loop(void) {
826         char cmdbuf[1024];
827
828         time(&CC->lastcmd);
829         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
830         if (client_getln(cmdbuf, sizeof cmdbuf) < 1) {
831                 lprintf(CTDL_ERR, "Client socket is broken; ending session\n");
832                 CC->kill_me = 1;
833                 return;
834         }
835
836         /* Log the server command, but don't show passwords... */
837         if ( (strncasecmp(cmdbuf, "PASS", 4))
838            && (strncasecmp(cmdbuf, "SETP", 4)) ) {
839                 lprintf(CTDL_INFO, "%s\n", cmdbuf);
840         }
841         else {
842                 lprintf(CTDL_INFO, "<password command sent>\n");
843         }
844
845         buffer_output();
846
847         /*
848          * Let other clients see the last command we executed, and
849          * update the idle time, but not NOOP, QNOP, PEXP, or GEXP.
850          */
851         if ( (strncasecmp(cmdbuf, "NOOP", 4))
852            && (strncasecmp(cmdbuf, "QNOP", 4))
853            && (strncasecmp(cmdbuf, "PEXP", 4))
854            && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
855                 strcpy(CC->lastcmdname, "    ");
856                 safestrncpy(CC->lastcmdname, cmdbuf, sizeof(CC->lastcmdname));
857                 time(&CC->lastidle);
858         }
859                 
860         if ((strncasecmp(cmdbuf, "ENT0", 4))
861            && (strncasecmp(cmdbuf, "MESG", 4))
862            && (strncasecmp(cmdbuf, "MSGS", 4)))
863         {
864            CC->cs_flags &= ~CS_POSTING;
865         }
866                    
867         if (!strncasecmp(cmdbuf, "NOOP", 4)) {
868                 cprintf("%d%cok\n", CIT_OK, CtdlCheckExpress() );
869         }
870         
871         else if (!strncasecmp(cmdbuf, "QNOP", 4)) {
872                 /* do nothing, this command returns no response */
873         }
874
875         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
876                 cprintf("%d Goodbye.\n", CIT_OK);
877                 CC->kill_me = 1;
878         }
879
880         else if (!strncasecmp(cmdbuf,"ASYN",4)) {
881                 cmd_asyn(&cmdbuf[5]);
882         }
883
884         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
885                 if (CC->logged_in) logout(CC);
886                 cprintf("%d logged out.\n", CIT_OK);
887         }
888
889         else if (!strncasecmp(cmdbuf,"USER",4)) {
890                 cmd_user(&cmdbuf[5]);
891         }
892
893         else if (!strncasecmp(cmdbuf,"PASS",4)) {
894                 cmd_pass(&cmdbuf[5]);
895         }
896
897         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
898                 cmd_newu(&cmdbuf[5]);
899         }
900
901         else if (!strncasecmp(cmdbuf,"CREU",4)) {
902                 cmd_creu(&cmdbuf[5]);
903         }
904
905         else if (!strncasecmp(cmdbuf,"SETP",4)) {
906                 cmd_setp(&cmdbuf[5]);
907         }
908
909         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
910                 cmd_lrms(&cmdbuf[5]);
911         }
912
913         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
914                 cmd_lkra(&cmdbuf[5]);
915         }
916
917         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
918                 cmd_lkrn(&cmdbuf[5]);
919         }
920
921         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
922                 cmd_lkro(&cmdbuf[5]);
923         }
924
925         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
926                 cmd_lzrm(&cmdbuf[5]);
927         }
928
929         else if (!strncasecmp(cmdbuf,"LPRM",4)) {
930                 cmd_lprm(&cmdbuf[5]);
931         }
932
933         else if (!strncasecmp(cmdbuf,"GETU",4)) {
934                 cmd_getu();
935         }
936
937         else if (!strncasecmp(cmdbuf,"SETU",4)) {
938                 cmd_setu(&cmdbuf[5]);
939         }
940
941         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
942                 cmd_goto(&cmdbuf[5]);
943         }
944
945         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
946                 cmd_msgs(&cmdbuf[5]);
947         }
948
949         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
950                 cmd_whok();
951         }
952
953         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
954                 cmd_rdir();
955         }
956
957         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
958                 cmd_msg0(&cmdbuf[5]);
959         }
960
961         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
962                 cmd_msg2(&cmdbuf[5]);
963         }
964
965         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
966                 cmd_msg3(&cmdbuf[5]);
967         }
968
969         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
970                 cmd_msg4(&cmdbuf[5]);
971         }
972
973         else if (!strncasecmp(cmdbuf,"MSGP",4)) {
974                 cmd_msgp(&cmdbuf[5]);
975         }
976
977         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
978                 cmd_opna(&cmdbuf[5]);
979         }
980
981         else if (!strncasecmp(cmdbuf,"INFO",4)) {
982                 cmd_info();
983         }
984
985         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
986                 cmd_slrp(&cmdbuf[5]);
987         }
988
989         else if (!strncasecmp(cmdbuf,"INVT",4)) {
990                 cmd_invt_kick(&cmdbuf[5],1);
991         }
992
993         else if (!strncasecmp(cmdbuf,"KICK",4)) {
994                 cmd_invt_kick(&cmdbuf[5],0);
995         }
996
997         else if (!strncasecmp(cmdbuf,"GETR",4)) {
998                 cmd_getr();
999         }
1000
1001         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1002                 cmd_setr(&cmdbuf[5]);
1003         }
1004
1005         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1006                 cmd_geta();
1007         }
1008
1009         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1010                 cmd_seta(&cmdbuf[5]);
1011         }
1012
1013         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1014                 cmd_ent0(&cmdbuf[5]);
1015         }
1016
1017         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1018                 cmd_rinf();
1019         }
1020
1021         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1022                 cmd_dele(&cmdbuf[5]);
1023         }
1024
1025         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1026                 cmd_kill(&cmdbuf[5]);
1027         }
1028
1029         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1030                 cmd_cre8(&cmdbuf[5]);
1031         }
1032
1033         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1034                 cmd_move(&cmdbuf[5]);
1035         }
1036
1037         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1038                 cmd_forg();
1039         }
1040
1041         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1042                 cmd_mesg(&cmdbuf[5]);
1043         }
1044
1045         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1046                 cmd_emsg(&cmdbuf[5]);
1047         }
1048
1049         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1050                 cmd_gnur();
1051         }
1052
1053         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1054                 cmd_vali(&cmdbuf[5]);
1055         }
1056
1057         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1058                 cmd_einf(&cmdbuf[5]);
1059         }
1060
1061         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1062                 cmd_list();
1063         }
1064
1065         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1066                 cmd_chek();
1067         }
1068
1069         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1070                 cmd_delf(&cmdbuf[5]);
1071         }
1072
1073         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1074                 cmd_movf(&cmdbuf[5]);
1075         }
1076
1077         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1078                 cmd_netf(&cmdbuf[5]);
1079         }
1080
1081         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1082                 cmd_open(&cmdbuf[5]);
1083         }
1084
1085         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1086                 cmd_clos();
1087         }
1088
1089         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1090                 cmd_uopn(&cmdbuf[5]);
1091         }
1092
1093         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1094                 cmd_ucls(&cmdbuf[5]);
1095         }
1096
1097         else if (!strncasecmp(cmdbuf,"READ",4)) {
1098                 cmd_read(&cmdbuf[5]);
1099         }
1100
1101         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1102                 cmd_writ(&cmdbuf[5]);
1103         }
1104
1105         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1106                 cmd_qusr(&cmdbuf[5]);
1107         }
1108
1109         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1110                 cmd_echo(&cmdbuf[5]);
1111         }
1112
1113         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1114                 cmd_oimg(&cmdbuf[5]);
1115         }
1116
1117         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1118                 cmd_more();
1119         }
1120
1121         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1122                 cmd_ndop(&cmdbuf[5]);
1123         }
1124
1125         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1126                 cmd_nuop(&cmdbuf[5]);
1127         }
1128
1129         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1130                 cmd_lflr();
1131         }
1132
1133         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1134                 cmd_cflr(&cmdbuf[5]);
1135         }
1136
1137         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1138                 cmd_kflr(&cmdbuf[5]);
1139         }
1140
1141         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1142                 cmd_eflr(&cmdbuf[5]);
1143         }
1144
1145         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1146                 cmd_iden(&cmdbuf[5]);
1147         }
1148
1149         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1150                 cmd_ipgm(&cmdbuf[5]);
1151         }
1152
1153         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1154                 cmd_term(&cmdbuf[5]);
1155         }
1156
1157         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1158                 cmd_down();
1159         }
1160
1161         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1162                 cmd_scdn(&cmdbuf[5]);
1163         }
1164
1165         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1166                 cmd_uimg(&cmdbuf[5]);
1167         }
1168
1169         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1170                 cmd_time();
1171         }
1172
1173         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1174                 cmd_agup(&cmdbuf[5]);
1175         }
1176
1177         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1178                 cmd_asup(&cmdbuf[5]);
1179         }
1180
1181         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1182                 cmd_gpex(&cmdbuf[5]);
1183         }
1184
1185         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1186                 cmd_spex(&cmdbuf[5]);
1187         }
1188
1189         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1190                 cmd_conf(&cmdbuf[5]);
1191         }
1192
1193         else if (!strncasecmp(cmdbuf, "SEEN", 4)) {
1194                 cmd_seen(&cmdbuf[5]);
1195         }
1196
1197         else if (!strncasecmp(cmdbuf, "GTSN", 4)) {
1198                 cmd_gtsn(&cmdbuf[5]);
1199         }
1200
1201         else if (!strncasecmp(cmdbuf, "VIEW", 4)) {
1202                 cmd_view(&cmdbuf[5]);
1203         }
1204
1205         else if (!strncasecmp(cmdbuf, "ISME", 4)) {
1206                 cmd_isme(&cmdbuf[5]);
1207         }
1208
1209         else if (!DLoader_Exec_Cmd(cmdbuf)) {
1210                 cprintf("%d Unrecognized or unsupported command.\n",
1211                         ERROR + CMD_NOT_SUPPORTED);
1212                }
1213
1214         unbuffer_output();
1215
1216         /* Run any after-each-command routines registered by modules */
1217         PerformSessionHooks(EVT_CMD);
1218 }
1219
1220
1221 /*
1222  * This loop performs all asynchronous functions.
1223  */
1224 void do_async_loop(void) {
1225         PerformSessionHooks(EVT_ASYNC);
1226 }