citadel/citserver.c

   1 /* $Id$ */
   2 #include "sysdep.h"
   3 #include <stdlib.h>
   4 #include <unistd.h>
   5 #include <stdio.h>
   6 #include <fcntl.h>
   7 #include <signal.h>
   8 #include <time.h>
   9 #include <ctype.h>
  10 #include <string.h>
  11 #include <errno.h>
  12 #include <limits.h>
  13 #ifdef HAVE_PTHREAD_H
  14 #include <pthread.h>
  15 #endif
  16 #include <syslog.h>
  17 #include <dlfcn.h>
  18 #include <netdb.h>
  19 #include <sys/socket.h>
  20 #include <netinet/in.h>
  21 #include <arpa/inet.h>
  22 #include "citadel.h"
  23 #include "server.h"
  24 #include "sysdep_decls.h"
  25 #include "citserver.h"
  26 #include "config.h"
  27 #include "database.h"
  28 #include "housekeeping.h"
  29 #include "user_ops.h"
  30 #include "logging.h"
  31 #include "support.h"
  32 #include "msgbase.h"
  33 #include "locate_host.h"
  34 #include "room_ops.h"
  35 #include "file_ops.h"
  36 #include "dynloader.h"
  37 #include "policy.h"
  38 #include "control.h"
  39 #include "tools.h"
  40
  41 struct CitContext *ContextList = NULL;
  42 int ScheduledShutdown = 0;
  43
  44 /*
  45  * Various things that need to be initialized at startup
  46  */
  47 void master_startup(void) {
  48         lprintf(7, "Opening databases\n");
  49         open_databases();
  50
  51         lprintf(7, "Checking floor reference counts\n");
  52         check_ref_counts();
  53
  54         lprintf(7, "Creating base rooms (if necessary)\n");
  55         create_room(BASEROOM, 0, "", 0);
  56         create_room(AIDEROOM, 4, "", 0);
  57         create_room(config.c_twitroom, 0, "", 0);
  58         }
  59
  60 /*
  61  * Cleanup routine to be called when the server is shutting down.
  62  */
  63 void master_cleanup(void) {
  64         struct CleanupFunctionHook *fcn;
  65
  66         /* Cancel all running sessions */
  67         lprintf(7, "Cancelling running sessions...\n");
  68         while (ContextList != NULL) {
  69                 kill_session(ContextList->cs_pid);
  70                 }
  71
  72         /* Run any cleanup routines registered by loadable modules */
  73         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
  74                 (*fcn->h_function_pointer)();
  75                 }
  76
  77         /* Close databases */
  78         lprintf(7, "Closing databases\n");
  79         close_databases();
  80
  81         /* Do system-dependent stuff */
  82         sysdep_master_cleanup();
  83
  84         /* Now go away. */
  85         lprintf(3, "citserver: exiting.\n");
  86         fflush(stdout); fflush(stderr);
  87         exit(0);
  88         }
  89
  90
  91 /*
  92  * Free any per-session data allocated by modules or whatever
  93  */
  94 void deallocate_user_data(struct CitContext *con)
  95 {
  96         struct CtdlSessData *ptr;
  97
  98         begin_critical_section(S_SESSION_TABLE);
  99         while (con->FirstSessData != NULL) {
 100                 lprintf(9, "Deallocating user data symbol %ld\n",
 101                         con->FirstSessData->sym_id);
 102                 if (con->FirstSessData->sym_data != NULL)
 103                         phree(con->FirstSessData->sym_data);
 104                 ptr = con->FirstSessData->next;
 105                 phree(con->FirstSessData);
 106                 con->FirstSessData = ptr;
 107         }
 108         end_critical_section(S_SESSION_TABLE);
 109 }
 110
 111
 112
 113
 114 /*
 115  * Gracefully terminate the session and thread.
 116  * (This is called as a cleanup handler by the thread library.)
 117  *
 118  * All NON-system-dependent stuff is done in this function.
 119  * System-dependent session/thread cleanup is in cleanup() in sysdep.c
 120  */
 121 void cleanup_stuff(void *arg)
 122 {
 123
 124         lprintf(9, "cleanup_stuff() called\n");
 125
 126         lprintf(7, "Calling logout(%d)\n", CC->cs_pid);
 127         logout(CC);
 128
 129         rec_log(CL_TERMINATE,CC->curr_user);
 130         unlink(CC->temp);
 131         lprintf(3, "citserver[%3d]: ended.\n",CC->cs_pid);
 132
 133         /* Run any cleanup routines registered by loadable modules */
 134         PerformSessionHooks(EVT_STOP);
 135
 136         syslog(LOG_NOTICE,"session %d ended", CC->cs_pid);
 137
 138         /* Deallocate any message list we might have in memory */
 139         if (CC->msglist != NULL) phree(CC->msglist);
 140
 141         /* Deallocate any user-data attached to this session */
 142         deallocate_user_data(CC);
 143
 144         /* Now get rid of the session and context */
 145         lprintf(7, "cleanup_stuff() calling RemoveContext(%d)\n", CC->cs_pid);
 146         RemoveContext(CC);
 147
 148         /* While we still have an extra thread with no user attached to it,
 149          * take the opportunity to do some housekeeping before exiting.
 150          */
 151         do_housekeeping();
 152         }
 153
 154
 155
 156 /*
 157  * Return a pointer to some generic per-session user data.
 158  * (This function returns NULL if the requested symbol is not allocated.)
 159  *
 160  * NOTE: we use critical sections for allocating and de-allocating these,
 161  *       but not for locating one.
 162  */
 163 void *CtdlGetUserData(unsigned long requested_sym)
 164 {
 165         struct CtdlSessData *ptr;
 166
 167         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)
 168                 if (ptr->sym_id == requested_sym)
 169                         return(ptr->sym_data);
 170
 171         lprintf(2, "ERROR! CtdlGetUserData(%ld) symbol not allocated\n",
 172                 requested_sym);
 173         return NULL;
 174 }
 175
 176
 177 /*
 178  * Allocate some generic per-session user data.
 179  */
 180 void CtdlAllocUserData(unsigned long requested_sym, size_t num_bytes)
 181 {
 182         struct CtdlSessData *ptr;
 183
 184         lprintf(9, "CtdlAllocUserData(%ld) called\n", requested_sym);
 185
 186         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 187                 if (ptr->sym_id == requested_sym) {
 188                         lprintf(2, "ERROR: CtdlAllocUserData() requested for"
 189                                 " symbol id %ld already registered\n",
 190                                 requested_sym);
 191                         return;
 192                 }
 193         }
 194
 195         ptr = mallok(sizeof(struct CtdlSessData));
 196         ptr->sym_id = requested_sym;
 197         ptr->sym_data = mallok(num_bytes);
 198
 199         begin_critical_section(S_SESSION_TABLE);
 200         ptr->next = CC->FirstSessData;
 201         CC->FirstSessData = ptr;
 202         end_critical_section(S_SESSION_TABLE);
 203
 204         lprintf(9, "CtdlAllocUserData(%ld) finished\n", requested_sym);
 205 }
 206
 207
 208
 209
 210
 211 /*
 212  * set_wtmpsupp()  -  alter the session listing
 213  */
 214 void set_wtmpsupp(char *newtext)
 215 {
 216         strncpy(CC->cs_room,newtext,sizeof CC->cs_room);
 217         CC->cs_room[sizeof CC->cs_room - 1] = 0;
 218         time(&CC->cs_lastupdt);
 219
 220         /* Run any routines registered by loadable modules */
 221         PerformSessionHooks(EVT_NEWROOM);
 222         }
 223
 224
 225 /*
 226  * call set_wtmpsupp() with the name of the current room, modified a bit...
 227  */
 228 void set_wtmpsupp_to_current_room() {
 229         if (CC->quickroom.QRflags & QR_PRIVATE) {
 230                 set_wtmpsupp("<private room>");
 231                 }
 232         else if (CC->quickroom.QRflags & QR_MAILBOX) {
 233                 set_wtmpsupp(&CC->quickroom.QRname[11]);
 234                 }
 235         else {
 236                 set_wtmpsupp(CC->quickroom.QRname);
 237                 }
 238         }
 239
 240
 241
 242 /*
 243  * cmd_info()  -  tell the client about this server
 244  */
 245 void cmd_info(void) {
 246         cprintf("%d Server info:\n",LISTING_FOLLOWS);
 247         cprintf("%d\n",CC->cs_pid);
 248         cprintf("%s\n",config.c_nodename);
 249         cprintf("%s\n",config.c_humannode);
 250         cprintf("%s\n",config.c_fqdn);
 251         cprintf("%s\n",CITADEL);
 252         cprintf("%d\n",REV_LEVEL);
 253         cprintf("%s\n",config.c_bbs_city);
 254         cprintf("%s\n",config.c_sysadm);
 255         cprintf("%d\n",SERVER_TYPE);
 256         cprintf("%s\n",config.c_moreprompt);
 257         cprintf("1\n"); /* 1 = yes, this system supports floors */
 258         cprintf("1\n"); /* 1 = we support the extended paging options */
 259         cprintf("000\n");
 260         }
 261
 262 void cmd_rchg(char *argbuf)
 263 {
 264         char newroomname[256]; /* set to 256 to prevent buffer overruns <dme>*/
 265
 266         extract(newroomname, argbuf, 0);
 267         newroomname[ROOMNAMELEN] = 0;
 268         if (strlen(newroomname) > 0) {
 269                 strncpy(CC->fake_roomname, newroomname, ROOMNAMELEN);
 270                 CC->fake_roomname[ROOMNAMELEN - 1] = 0;
 271                 }
 272         else {
 273                 strcpy(CC->fake_roomname, "");
 274                 }
 275         cprintf("%d OK\n", OK);
 276 }
 277
 278 void cmd_hchg(char *newhostname)
 279 {
 280    if ((newhostname) && (newhostname[0]))
 281    {
 282       memset(CC->fake_hostname, 0, 25);
 283       strncpy(CC->fake_hostname, newhostname, 24);
 284    }
 285    else
 286       strcpy(CC->fake_hostname, "");
 287    cprintf("%d OK\n",OK);
 288 }
 289
 290 void cmd_uchg(char *newusername)
 291 {
 292    if (CC->usersupp.axlevel < 6)
 293    {
 294       cprintf("%d You must be an Aide to use UCHG.\n",
 295                 ERROR+HIGHER_ACCESS_REQUIRED);
 296       return;
 297    }
 298    if ((newusername) && (newusername[0]))
 299    {
 300       CC->cs_flags &= ~CS_STEALTH;
 301       memset(CC->fake_username, 0, 32);
 302       if (strncasecmp(newusername, CC->curr_user, strlen(CC->curr_user)))
 303          strncpy(CC->fake_username, newusername, 31);
 304    }
 305    else
 306    {
 307       CC->fake_username[0] = '\0';
 308       CC->cs_flags |= CS_STEALTH;
 309    }
 310    cprintf("%d\n",OK);
 311 }
 312
 313 /*
 314  * returns an asterisk if there are any express messages waiting,
 315  * space otherwise.
 316  */
 317 char check_express(void) {
 318         if (CC->FirstExpressMessage == NULL) {
 319                 return(' ');
 320                 }
 321         else {
 322                 return('*');
 323                 }
 324         }
 325
 326 void cmd_time(void)
 327 {
 328    time_t tv;
 329
 330    tv = time(NULL);
 331
 332    cprintf("%d %ld\n", OK, tv);
 333 }
 334
 335 /*
 336  * Check whether two hostnames match.
 337  * "Realname" should be an actual name of a client that is trying to connect;
 338  * "testname" should be the value we are comparing it with. The idea is that we
 339  * want to compare with both the abbreviated and fully-qualified versions of
 340  * "testname;" some people define "localhost" as "localhost.foo.com," etc.
 341  */
 342 static int hostnames_match(const char *realname, const char *testname) {
 343         struct hostent *he;
 344         int retval = 0;
 345
 346         if (!strcasecmp(realname, testname))
 347                 return 1;
 348
 349 #ifdef HAVE_NONREENTRANT_NETDB
 350         begin_critical_section(S_NETDB);
 351 #endif
 352
 353         if ((he = gethostbyname(testname)) != NULL)
 354                 if (!strcasecmp(realname, he->h_name))
 355                         retval = 1;
 356
 357 #ifdef HAVE_NONREENTRANT_NETDB
 358         end_critical_section(S_NETDB);
 359 #endif
 360
 361         return retval;
 362         }
 363
 364 /*
 365  * check a hostname against the public_clients file
 366  */
 367 int is_public_client(char *where)
 368 {
 369         char buf[256];
 370         FILE *fp;
 371
 372         if (hostnames_match(where,"localhost")) return(1);
 373         if (hostnames_match(where,config.c_fqdn)) return(1);
 374
 375         fp = fopen("public_clients","r");
 376         if (fp == NULL) return(0);
 377
 378         while (fgets(buf,256,fp)!=NULL) {
 379                 while (isspace((buf[strlen(buf)-1])))
 380                         buf[strlen(buf)-1] = 0;
 381                 if (hostnames_match(where,buf)) {
 382                         fclose(fp);
 383                         return(1);
 384                         }
 385                 }
 386
 387         fclose(fp);
 388         return(0);
 389         }
 390
 391
 392 /*
 393  * the client is identifying itself to the server
 394  */
 395 void cmd_iden(char *argbuf)
 396 {
 397         int dev_code;
 398         int cli_code;
 399         int rev_level;
 400         char desc[256];
 401         char from_host[256];
 402         struct in_addr addr;
 403
 404         if (num_parms(argbuf)<4) {
 405                 cprintf("%d usage error\n",ERROR);
 406                 return;
 407                 }
 408
 409         dev_code = extract_int(argbuf,0);
 410         cli_code = extract_int(argbuf,1);
 411         rev_level = extract_int(argbuf,2);
 412         extract(desc,argbuf,3);
 413
 414         strncpy(from_host,config.c_fqdn,sizeof from_host);
 415         from_host[sizeof from_host - 1] = 0;
 416         if (num_parms(argbuf)>=5) extract(from_host,argbuf,4);
 417
 418         CC->cs_clientdev = dev_code;
 419         CC->cs_clienttyp = cli_code;
 420         CC->cs_clientver = rev_level;
 421         strncpy(CC->cs_clientname,desc,31);
 422         CC->cs_clientname[31] = 0;
 423
 424         if ((strlen(from_host)>0) &&
 425            (is_public_client(CC->cs_host))) {
 426                 if (inet_aton(from_host, &addr))
 427                         locate_host(CC->cs_host, &addr);
 428                 else {
 429                         strncpy(CC->cs_host,from_host,24);
 430                         CC->cs_host[24] = 0;
 431                         }
 432                 }
 433         set_wtmpsupp_to_current_room();
 434
 435         syslog(LOG_NOTICE,"client %d/%d/%01d.%02d (%s)\n",
 436                 dev_code,
 437                 cli_code,
 438                 (rev_level / 100),
 439                 (rev_level % 100),
 440                 desc);
 441                 cprintf("%d Ok\n",OK);
 442         }
 443
 444
 445 /*
 446  * enter or exit "stealth mode"
 447  */
 448 void cmd_stel(char *cmdbuf)
 449 {
 450         int requested_mode;
 451
 452         requested_mode = extract_int(cmdbuf,0);
 453         if (requested_mode !=0) requested_mode = 1;
 454
 455         if (!CC->logged_in) {
 456                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 457                 return;
 458                 }
 459
 460         if (CC->usersupp.axlevel < 6) {
 461                 cprintf("%d You must be an Aide to use stealth mode.\n",
 462                         ERROR+HIGHER_ACCESS_REQUIRED);
 463                 return;
 464                 }
 465
 466         if (CC->cs_flags & CS_STEALTH) {
 467                 if (requested_mode == 0)
 468                         CC->cs_flags = CC->cs_flags-CS_STEALTH;
 469                 }
 470         else {
 471                 if (requested_mode == 1)
 472                         CC->cs_flags = CC->cs_flags|CS_STEALTH;
 473                 }
 474
 475         set_wtmpsupp_to_current_room();
 476         cprintf("%d Ok\n",OK);
 477         }
 478
 479
 480
 481
 482 /*
 483  * display system messages or help
 484  */
 485 void cmd_mesg(char *mname)
 486 {
 487         FILE *mfp;
 488         char targ[256];
 489         char buf[256];
 490         char *dirs[2];
 491
 492         extract(buf,mname,0);
 493
 494
 495         dirs[0]=mallok(64);
 496         dirs[1]=mallok(64);
 497         strcpy(dirs[0],"messages");
 498         strcpy(dirs[1],"help");
 499         mesg_locate(targ,buf,2,dirs);
 500         phree(dirs[0]);
 501         phree(dirs[1]);
 502
 503
 504         if (strlen(targ)==0) {
 505                 cprintf("%d '%s' not found.\n",ERROR,mname);
 506                 return;
 507                 }
 508
 509         mfp = fopen(targ,"r");
 510         if (mfp==NULL) {
 511                 cprintf("%d Cannot open '%s': %s\n",
 512                         ERROR,targ,strerror(errno));
 513                 return;
 514                 }
 515         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
 516
 517         while (fgets(buf,255,mfp)!=NULL) {
 518                 buf[strlen(buf)-1] = 0;
 519                 do_help_subst(buf);
 520                 cprintf("%s\n",buf);
 521                 }
 522
 523         fclose(mfp);
 524         cprintf("000\n");
 525         }
 526
 527
 528 /*
 529  * enter system messages or help
 530  */
 531 void cmd_emsg(char *mname)
 532 {
 533         FILE *mfp;
 534         char targ[256];
 535         char buf[256];
 536         char *dirs[2];
 537         int a;
 538
 539         if (CC->usersupp.axlevel < 6) {
 540                 cprintf("%d You must be an Aide to edit system messages.\n",
 541                         ERROR+HIGHER_ACCESS_REQUIRED);
 542                 return;
 543                 }
 544
 545         extract(buf,mname,0);
 546         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 547                 if (buf[a] == '/') buf[a] = '.';
 548                 }
 549
 550         dirs[0]=mallok(64);
 551         dirs[1]=mallok(64);
 552         strcpy(dirs[0],"messages");
 553         strcpy(dirs[1],"help");
 554         mesg_locate(targ,buf,2,dirs);
 555         phree(dirs[0]);
 556         phree(dirs[1]);
 557
 558         if (strlen(targ)==0) {
 559                 snprintf(targ, sizeof targ, "./help/%s", buf);
 560                 }
 561
 562         mfp = fopen(targ,"w");
 563         if (mfp==NULL) {
 564                 cprintf("%d Cannot open '%s': %s\n",
 565                         ERROR,targ,strerror(errno));
 566                 return;
 567                 }
 568         cprintf("%d %s\n", SEND_LISTING, targ);
 569
 570         while (client_gets(buf), strcmp(buf, "000")) {
 571                 fprintf(mfp, "%s\n", buf);
 572                 }
 573
 574         fclose(mfp);
 575         }
 576
 577
 578 /*
 579  * who's online
 580  */
 581 void cmd_rwho(void) {
 582         struct CitContext *cptr;
 583         int spoofed = 0;
 584         int aide;
 585         char un[40], room[40], host[40], flags[5];
 586
 587         aide = CC->usersupp.axlevel >= 6;
 588         cprintf("%d\n",LISTING_FOLLOWS);
 589
 590         for (cptr = ContextList; cptr != NULL; cptr = cptr->next)
 591         {
 592                 flags[0] = '\0';
 593                 spoofed = 0;
 594
 595                 if (cptr->cs_flags & CS_POSTING)
 596                    strcat(flags, "*");
 597                 else
 598                    strcat(flags, ".");
 599
 600                 if (cptr->fake_username[0])
 601                 {
 602                    strcpy(un, cptr->fake_username);
 603                    spoofed = 1;
 604                 }
 605                 else
 606                    strcpy(un, cptr->curr_user);
 607
 608                 if (cptr->fake_hostname[0])
 609                 {
 610                    strcpy(host, cptr->fake_hostname);
 611                    spoofed = 1;
 612                 }
 613                 else
 614                    strcpy(host, cptr->cs_host);
 615
 616                 if (cptr->fake_roomname[0])
 617                 {
 618                    strcpy(room, cptr->fake_roomname);
 619                    spoofed = 1;
 620                 }
 621                 else
 622                    strcpy(room, cptr->cs_room);
 623
 624
 625                 if ((aide) && (spoofed))
 626                    strcat(flags, "+");
 627
 628                 if ((cptr->cs_flags & CS_STEALTH) && (aide))
 629                    strcat(flags, "-");
 630
 631                 if (((cptr->cs_flags&CS_STEALTH)==0) || (aide))
 632                 {
 633                         cprintf("%d|%s|%s|%s|%s|%ld|%s|%s\n",
 634                                 cptr->cs_pid, un, room,
 635                                 host, cptr->cs_clientname,
 636                                 (long)(cptr->lastidle),
 637                                 cptr->lastcmdname, flags);
 638                 }
 639                 if ((spoofed) && (aide))
 640                 {
 641                         cprintf("%d|%s|%s|%s|%s|%ld|%s|%s\n",
 642                                 cptr->cs_pid, cptr->curr_user, cptr->cs_room,
 643                                 cptr->cs_host, cptr->cs_clientname,
 644                                 (long)(cptr->lastidle),
 645                                 cptr->lastcmdname, flags);
 646
 647                 }
 648         }
 649         cprintf("000\n");
 650         }
 651
 652
 653 /*
 654  * Terminate another running session
 655  */
 656 void cmd_term(char *cmdbuf)
 657 {
 658         int session_num;
 659         struct CitContext *ccptr;
 660         int session_to_kill = 0;
 661
 662         if (!CC->logged_in) {
 663                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 664                 return;
 665                 }
 666
 667         if (CC->usersupp.axlevel < 6) {
 668                 cprintf("%d You must be an Aide to terminate sessions.\n",
 669                         ERROR+HIGHER_ACCESS_REQUIRED);
 670                 return;
 671                 }
 672
 673         session_num = extract_int(cmdbuf, 0);
 674         if (session_num == CC->cs_pid) {
 675                 cprintf("%d You can't kill your own session.\n", ERROR);
 676                 return;
 677                 }
 678
 679         lprintf(9, "Locating session to kill\n");
 680         begin_critical_section(S_SESSION_TABLE);
 681         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 682                 if (session_num == ccptr->cs_pid) {
 683                         session_to_kill = ccptr->cs_pid;
 684                         }
 685                 }
 686         end_critical_section(S_SESSION_TABLE);
 687         lprintf(9, "session_to_kill == %d\n", session_to_kill);
 688
 689         if (session_to_kill > 0) {
 690                 lprintf(9, "calling kill_session()\n");
 691                 kill_session(session_to_kill);
 692                 cprintf("%d Session terminated.\n", OK);
 693                 }
 694         else {
 695                 cprintf("%d No such session.\n", ERROR);
 696                 }
 697         }
 698
 699
 700
 701
 702
 703 /*
 704  * get the paginator prompt
 705  */
 706 void cmd_more(void) {
 707         cprintf("%d %s\n",OK,config.c_moreprompt);
 708         }
 709
 710 /*
 711  * echo
 712  */
 713 void cmd_echo(char *etext)
 714 {
 715         cprintf("%d %s\n",OK,etext);
 716         }
 717
 718
 719
 720 /*
 721  * identify as internal program
 722  */
 723 void cmd_ipgm(char *argbuf)
 724 {
 725         int secret;
 726
 727         secret = extract_int(argbuf, 0);
 728         if (secret == config.c_ipgm_secret) {
 729                 CC->internal_pgm = 1;
 730                 strcpy(CC->curr_user, "<internal program>");
 731                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 732                 cprintf("%d Authenticated as an internal program.\n",OK);
 733                 }
 734         else {
 735                 cprintf("%d Authentication failed.\n",ERROR);
 736                 }
 737         }
 738
 739
 740 /*
 741  * Shut down the server
 742  */
 743 void cmd_down(void) {
 744         if (!CC->logged_in) {
 745                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 746                 return;
 747                 }
 748
 749         if (CC->usersupp.axlevel < 6) {
 750                 cprintf("%d You must be an Aide to shut down the server.\n",
 751                         ERROR+HIGHER_ACCESS_REQUIRED);
 752                 return;
 753                 }
 754
 755         cprintf("%d Shutting down server.  Goodbye.\n", OK);
 756         master_cleanup();
 757         }
 758
 759 /*
 760  * Schedule or cancel a server shutdown
 761  */
 762 void cmd_scdn(char *argbuf)
 763 {
 764         int new_state;
 765
 766         if (!CC->logged_in) {
 767                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 768                 return;
 769                 }
 770
 771         if (CC->usersupp.axlevel < 6) {
 772                 cprintf("%d You must be an Aide to schedule a shutdown.\n",
 773                         ERROR+HIGHER_ACCESS_REQUIRED);
 774                 return;
 775                 }
 776
 777         new_state = extract_int(argbuf, 0);
 778         if ((new_state == 0) || (new_state == 1)) {
 779                 ScheduledShutdown = new_state;
 780                 }
 781         cprintf("%d %d\n", OK, ScheduledShutdown);
 782         }
 783
 784
 785 /*
 786  * main context loop
 787  */
 788 void *context_loop(struct CitContext *con)
 789 {
 790         char cmdbuf[256];
 791         int num_sessions, len;
 792         struct sockaddr_in sin;
 793
 794         /*
 795          * Wedge our way into the context table.
 796          */
 797         InitMyContext(con);
 798
 799         /*
 800          * Initialize some variables specific to our context.
 801          */
 802         CC->logged_in = 0;
 803         CC->internal_pgm = 0;
 804         CC->download_fp = NULL;
 805         CC->upload_fp = NULL;
 806         CC->cs_pid = con->client_socket;        /* not necessarily portable */
 807         CC->FirstExpressMessage = NULL;
 808         CC->msglist = NULL;
 809         CC->num_msgs = 0;
 810         time(&CC->lastcmd);
 811         time(&CC->lastidle);
 812         strcpy(CC->lastcmdname, "    ");
 813         strcpy(CC->cs_clientname, "(unknown)");
 814         strcpy(CC->curr_user,"(not logged in)");
 815         strcpy(CC->net_node,"");
 816         snprintf(CC->temp, sizeof CC->temp, "/tmp/CitServer.%d.%d", getpid(), CC->cs_pid);
 817         strcpy(CC->cs_room, "(no room)");
 818         strncpy(CC->cs_host, config.c_fqdn, sizeof CC->cs_host);
 819         CC->cs_host[sizeof CC->cs_host - 1] = 0;
 820         len = sizeof sin;
 821         if (!getpeername(CC->client_socket, (struct sockaddr *) &sin, &len))
 822                 locate_host(CC->cs_host, &sin.sin_addr);
 823         CC->cs_flags = 0;
 824         CC->upload_type = UPL_FILE;
 825         CC->dl_is_net = 0;
 826         CC->FirstSessData = NULL;
 827
 828         num_sessions = session_count();
 829         CC->nologin = 0;
 830         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 831                 CC->nologin = 1;
 832
 833         if (CC->nologin==1) {
 834            cprintf("%d %s: Too many users are already online (maximum is %d)\n",
 835                 ERROR+MAX_SESSIONS_EXCEEDED,
 836                 config.c_nodename,config.c_maxsessions);
 837                 }
 838         else {
 839            cprintf("%d %s Citadel/UX server ready.\n",OK,config.c_nodename);
 840                 }
 841
 842         lprintf(3, "citserver[%3d]: started.\n", CC->cs_pid);
 843
 844         /* Run any session startup routines registered by loadable modules */
 845         PerformSessionHooks(EVT_START);
 846
 847         rec_log(CL_CONNECT, "");
 848
 849         do {
 850                 time(&CC->lastcmd);
 851                 memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 852                 if (client_gets(cmdbuf) < 1) cleanup(EXIT_NULL);
 853                 lprintf(5, "citserver[%3d]: %s\n", CC->cs_pid, cmdbuf);
 854
 855                 /*
 856                  * Let other clients see the last command we executed, but
 857                  * exclude NOOP because that would be boring.
 858                  */
 859                 if (strncasecmp(cmdbuf, "NOOP", 4)) {
 860                         strcpy(CC->lastcmdname, "    ");
 861                         strncpy(CC->lastcmdname, cmdbuf, 4);
 862                         time(&CC->lastidle);
 863                         }
 864
 865                 if ((strncasecmp(cmdbuf, "ENT0", 4)) && (strncasecmp(cmdbuf, "MESG", 4)) && (strncasecmp(cmdbuf, "MSGS", 4)))
 866                 {
 867                    CC->cs_flags &= ~CS_POSTING;
 868                 }
 869
 870 /*
 871  * This loop recognizes all server commands.
 872  */
 873
 874                 if (!strncasecmp(cmdbuf,"NOOP",4)) {
 875                         cprintf("%d%cok\n",OK,check_express());
 876                         }
 877
 878                 else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 879                         cprintf("%d Goodbye.\n",OK);
 880                         }
 881
 882                 else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 883                         if (CC->logged_in) logout(CC);
 884                         cprintf("%d logged out.\n",OK);
 885                         }
 886
 887                 else if (!strncasecmp(cmdbuf,"USER",4)) {
 888                         cmd_user(&cmdbuf[5]);
 889                         }
 890
 891                 else if (!strncasecmp(cmdbuf,"PASS",4)) {
 892                         cmd_pass(&cmdbuf[5]);
 893                         }
 894
 895                 else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 896                         cmd_newu(&cmdbuf[5]);
 897                         }
 898
 899                 else if (!strncasecmp(cmdbuf,"SETP",4)) {
 900                         cmd_setp(&cmdbuf[5]);
 901                         }
 902
 903                 else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 904                         cmd_lrms(&cmdbuf[5]);
 905                         }
 906
 907                 else if (!strncasecmp(cmdbuf,"LKRA",4)) {
 908                         cmd_lkra(&cmdbuf[5]);
 909                         }
 910
 911                 else if (!strncasecmp(cmdbuf,"LKRN",4)) {
 912                         cmd_lkrn(&cmdbuf[5]);
 913                         }
 914
 915                 else if (!strncasecmp(cmdbuf,"LKRO",4)) {
 916                         cmd_lkro(&cmdbuf[5]);
 917                         }
 918
 919                 else if (!strncasecmp(cmdbuf,"LZRM",4)) {
 920                         cmd_lzrm(&cmdbuf[5]);
 921                         }
 922
 923                 else if (!strncasecmp(cmdbuf,"GETU",4)) {
 924                         cmd_getu();
 925                         }
 926
 927                 else if (!strncasecmp(cmdbuf,"SETU",4)) {
 928                         cmd_setu(&cmdbuf[5]);
 929                         }
 930
 931                 else if (!strncasecmp(cmdbuf,"GOTO",4)) {
 932                         cmd_goto(&cmdbuf[5]);
 933                         }
 934
 935                 else if (!strncasecmp(cmdbuf,"MSGS",4)) {
 936                         cmd_msgs(&cmdbuf[5]);
 937                         }
 938
 939                 else if (!strncasecmp(cmdbuf,"WHOK",4)) {
 940                         cmd_whok();
 941                         }
 942
 943                 else if (!strncasecmp(cmdbuf,"RDIR",4)) {
 944                         cmd_rdir();
 945                         }
 946
 947                 else if (!strncasecmp(cmdbuf,"MSG0",4)) {
 948                         cmd_msg0(&cmdbuf[5]);
 949                         }
 950
 951                 else if (!strncasecmp(cmdbuf,"MSG2",4)) {
 952                         cmd_msg2(&cmdbuf[5]);
 953                         }
 954
 955                 else if (!strncasecmp(cmdbuf,"MSG3",4)) {
 956                         cmd_msg3(&cmdbuf[5]);
 957                         }
 958
 959                 else if (!strncasecmp(cmdbuf,"MSG4",4)) {
 960                         cmd_msg4(&cmdbuf[5]);
 961                         }
 962
 963                 else if (!strncasecmp(cmdbuf,"OPNA",4)) {
 964                         cmd_opna(&cmdbuf[5]);
 965                         }
 966
 967                 else if (!strncasecmp(cmdbuf,"INFO",4)) {
 968                         cmd_info();
 969                         }
 970
 971                 else if (!strncasecmp(cmdbuf,"SLRP",4)) {
 972                         cmd_slrp(&cmdbuf[5]);
 973                         }
 974
 975                 else if (!strncasecmp(cmdbuf,"INVT",4)) {
 976                         cmd_invt_kick(&cmdbuf[5],1);
 977                         }
 978
 979                 else if (!strncasecmp(cmdbuf,"KICK",4)) {
 980                         cmd_invt_kick(&cmdbuf[5],0);
 981                         }
 982
 983                 else if (!strncasecmp(cmdbuf,"GETR",4)) {
 984                         cmd_getr();
 985                         }
 986
 987                 else if (!strncasecmp(cmdbuf,"SETR",4)) {
 988                         cmd_setr(&cmdbuf[5]);
 989                         }
 990
 991                 else if (!strncasecmp(cmdbuf,"GETA",4)) {
 992                         cmd_geta();
 993                         }
 994
 995                 else if (!strncasecmp(cmdbuf,"SETA",4)) {
 996                         cmd_seta(&cmdbuf[5]);
 997                         }
 998
 999                 else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1000                         cmd_ent0(&cmdbuf[5]);
1001                         }
1002
1003                 else if (!strncasecmp(cmdbuf,"ENT3",4)) {
1004                         cmd_ent3(&cmdbuf[5]);
1005                         }
1006
1007                 else if (!strncasecmp(cmdbuf,"RINF",4)) {
1008                         cmd_rinf();
1009                         }
1010
1011                 else if (!strncasecmp(cmdbuf,"DELE",4)) {
1012                         cmd_dele(&cmdbuf[5]);
1013                         }
1014
1015                 else if (!strncasecmp(cmdbuf,"KILL",4)) {
1016                         cmd_kill(&cmdbuf[5]);
1017                         }
1018
1019                 else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1020                         cmd_cre8(&cmdbuf[5]);
1021                         }
1022
1023                 else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1024                         cmd_move(&cmdbuf[5]);
1025                         }
1026
1027                 else if (!strncasecmp(cmdbuf,"FORG",4)) {
1028                         cmd_forg();
1029                         }
1030
1031                 else if (!strncasecmp(cmdbuf,"MESG",4)) {
1032                         cmd_mesg(&cmdbuf[5]);
1033                         }
1034
1035                 else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1036                         cmd_emsg(&cmdbuf[5]);
1037                         }
1038
1039                 else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1040                         cmd_gnur();
1041                         }
1042
1043                 else if (!strncasecmp(cmdbuf,"GREG",4)) {
1044                         cmd_greg(&cmdbuf[5]);
1045                         }
1046
1047                 else if (!strncasecmp(cmdbuf,"VALI",4)) {
1048                         cmd_vali(&cmdbuf[5]);
1049                         }
1050
1051                 else if (!strncasecmp(cmdbuf,"EINF",4)) {
1052                         cmd_einf(&cmdbuf[5]);
1053                         }
1054
1055                 else if (!strncasecmp(cmdbuf,"LIST",4)) {
1056                         cmd_list();
1057                         }
1058
1059                 else if (!strncasecmp(cmdbuf,"REGI",4)) {
1060                         cmd_regi();
1061                         }
1062
1063                 else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1064                         cmd_chek();
1065                         }
1066
1067                 else if (!strncasecmp(cmdbuf,"DELF",4)) {
1068                         cmd_delf(&cmdbuf[5]);
1069                         }
1070
1071                 else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1072                         cmd_movf(&cmdbuf[5]);
1073                         }
1074
1075                 else if (!strncasecmp(cmdbuf,"NETF",4)) {
1076                         cmd_netf(&cmdbuf[5]);
1077                         }
1078
1079                 else if (!strncasecmp(cmdbuf,"RWHO",4)) {
1080                         cmd_rwho();
1081                         }
1082
1083                 else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1084                         cmd_open(&cmdbuf[5]);
1085                         }
1086
1087                 else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1088                         cmd_clos();
1089                         }
1090
1091                 else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1092                         cmd_uopn(&cmdbuf[5]);
1093                         }
1094
1095                 else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1096                         cmd_ucls(&cmdbuf[5]);
1097                         }
1098
1099                 else if (!strncasecmp(cmdbuf,"READ",4)) {
1100                         cmd_read(&cmdbuf[5]);
1101                         }
1102
1103                 else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1104                         cmd_writ(&cmdbuf[5]);
1105                         }
1106
1107                 else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1108                         cmd_qusr(&cmdbuf[5]);
1109                         }
1110
1111                 else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1112                         cmd_echo(&cmdbuf[5]);
1113                         }
1114
1115                 else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1116                         cmd_oimg(&cmdbuf[5]);
1117                         }
1118
1119                 else if (!strncasecmp(cmdbuf,"MORE",4)) {
1120                         cmd_more();
1121                         }
1122
1123                 else if (!strncasecmp(cmdbuf,"NETP",4)) {
1124                         cmd_netp(&cmdbuf[5]);
1125                         }
1126
1127                 else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1128                         cmd_ndop(&cmdbuf[5]);
1129                         }
1130
1131                 else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1132                         cmd_nuop(&cmdbuf[5]);
1133                         }
1134
1135                 else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1136                         cmd_lflr();
1137                         }
1138
1139                 else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1140                         cmd_cflr(&cmdbuf[5]);
1141                         }
1142
1143                 else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1144                         cmd_kflr(&cmdbuf[5]);
1145                         }
1146
1147                 else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1148                         cmd_eflr(&cmdbuf[5]);
1149                         }
1150
1151                 else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1152                         cmd_iden(&cmdbuf[5]);
1153                         }
1154
1155                 else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1156                         cmd_ipgm(&cmdbuf[5]);
1157                         }
1158
1159                 else if (!strncasecmp(cmdbuf,"EBIO",4)) {
1160                         cmd_ebio();
1161                         }
1162
1163                 else if (!strncasecmp(cmdbuf,"RBIO",4)) {
1164                         cmd_rbio(&cmdbuf[5]);
1165                         }
1166
1167                 else if (!strncasecmp(cmdbuf,"LBIO",4)) {
1168                         cmd_lbio();
1169                         }
1170
1171                 else if (!strncasecmp(cmdbuf,"STEL",4)) {
1172                         cmd_stel(&cmdbuf[5]);
1173                         }
1174
1175                 else if (!strncasecmp(cmdbuf,"TERM",4)) {
1176                         cmd_term(&cmdbuf[5]);
1177                         }
1178
1179                 else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1180                         cmd_down();
1181                         }
1182
1183                 else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1184                         cmd_scdn(&cmdbuf[5]);
1185                         }
1186
1187                 else if (!strncasecmp(cmdbuf, "NSET", 4)) {
1188                         cmd_nset(&cmdbuf[5]);
1189                         }
1190
1191                 else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1192                         cmd_uimg(&cmdbuf[5]);
1193                         }
1194
1195                 else if (!strncasecmp(cmdbuf, "UCHG", 4)) {
1196                         cmd_uchg(&cmdbuf[5]);
1197                         }
1198
1199                 else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1200                         cmd_time();
1201                         }
1202
1203                 else if (!strncasecmp(cmdbuf, "HCHG", 4)) {
1204                         cmd_hchg(&cmdbuf[5]);
1205                         }
1206
1207                 else if (!strncasecmp(cmdbuf, "RCHG", 4)) {
1208                         cmd_rchg(&cmdbuf[5]);
1209                         }
1210
1211                 else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1212                         cmd_agup(&cmdbuf[5]);
1213                         }
1214
1215                 else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1216                         cmd_asup(&cmdbuf[5]);
1217                         }
1218
1219                 else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1220                         cmd_gpex(&cmdbuf[5]);
1221                         }
1222
1223                 else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1224                         cmd_spex(&cmdbuf[5]);
1225                         }
1226
1227                 else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1228                         cmd_conf(&cmdbuf[5]);
1229                         }
1230
1231 #ifdef DEBUG_MEMORY_LEAKS
1232                 else if (!strncasecmp(cmdbuf, "LEAK", 4)) {
1233                         dump_tracked();
1234                         }
1235 #endif
1236
1237                 else if (!DLoader_Exec_Cmd(cmdbuf))
1238                         {
1239                            cprintf("%d Unrecognized or unsupported command.\n",
1240                                     ERROR);
1241                         }
1242
1243                 } while(strncasecmp(cmdbuf, "QUIT", 4));
1244
1245         cleanup(EXIT_NORMAL);
1246         return(NULL);
1247         }