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