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 int do_defrag = 0;
  44 int (*CtdlSendExpressMessageFunc) (char *, char *, char *) = NULL;
  45
  46 /*
  47  * Various things that need to be initialized at startup
  48  */
  49 void master_startup(void) {
  50         lprintf(7, "Opening databases\n");
  51         open_databases();
  52
  53         if (do_defrag)
  54                 defrag_databases();
  55
  56         lprintf(7, "Checking floor reference counts\n");
  57         check_ref_counts();
  58
  59         lprintf(7, "Creating base rooms (if necessary)\n");
  60         create_room(BASEROOM, 0, "", 0);
  61         create_room(AIDEROOM, 4, "", 0);
  62         create_room(config.c_twitroom, 0, "", 0);
  63         }
  64
  65 /*
  66  * Cleanup routine to be called when the server is shutting down.
  67  */
  68 void master_cleanup(void) {
  69         struct CleanupFunctionHook *fcn;
  70
  71         /* Cancel all running sessions */
  72         lprintf(7, "Cancelling running sessions...\n");
  73         while (ContextList != NULL) {
  74                 kill_session(ContextList->cs_pid);
  75                 }
  76
  77         /* Run any cleanup routines registered by loadable modules */
  78         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
  79                 (*fcn->h_function_pointer)();
  80                 }
  81
  82         /* Close databases */
  83         lprintf(7, "Closing databases\n");
  84         close_databases();
  85
  86         /* Do system-dependent stuff */
  87         sysdep_master_cleanup();
  88
  89         /* Now go away. */
  90         lprintf(3, "citserver: exiting.\n");
  91         fflush(stdout); fflush(stderr);
  92         exit(0);
  93         }
  94
  95
  96 /*
  97  * Free any per-session data allocated by modules or whatever
  98  */
  99 void deallocate_user_data(struct CitContext *con)
 100 {
 101         struct CtdlSessData *ptr;
 102
 103         begin_critical_section(S_SESSION_TABLE);
 104         while (con->FirstSessData != NULL) {
 105                 lprintf(9, "Deallocating user data symbol %ld\n",
 106                         con->FirstSessData->sym_id);
 107                 if (con->FirstSessData->sym_data != NULL)
 108                         phree(con->FirstSessData->sym_data);
 109                 ptr = con->FirstSessData->next;
 110                 phree(con->FirstSessData);
 111                 con->FirstSessData = ptr;
 112         }
 113         end_critical_section(S_SESSION_TABLE);
 114 }
 115
 116
 117
 118
 119 /*
 120  * Gracefully terminate the session and thread.
 121  * (This is called as a cleanup handler by the thread library.)
 122  *
 123  * All NON-system-dependent stuff is done in this function.
 124  * System-dependent session/thread cleanup is in cleanup() in sysdep.c
 125  */
 126 void cleanup_stuff(void *arg)
 127 {
 128
 129         lprintf(9, "cleanup_stuff() called\n");
 130
 131         lprintf(7, "Calling logout(%d)\n", CC->cs_pid);
 132         logout(CC);
 133
 134         rec_log(CL_TERMINATE,CC->curr_user);
 135         unlink(CC->temp);
 136         lprintf(3, "citserver[%3d]: ended.\n",CC->cs_pid);
 137
 138         /* Run any cleanup routines registered by loadable modules */
 139         PerformSessionHooks(EVT_STOP);
 140
 141         syslog(LOG_NOTICE,"session %d ended", CC->cs_pid);
 142
 143         /* Deallocate any message list we might have in memory */
 144         if (CC->msglist != NULL) phree(CC->msglist);
 145
 146         /* Deallocate any user-data attached to this session */
 147         deallocate_user_data(CC);
 148
 149         /* Now get rid of the session and context */
 150         lprintf(7, "cleanup_stuff() calling RemoveContext(%d)\n", CC->cs_pid);
 151         RemoveContext(CC);
 152
 153         /* While we still have an extra thread with no user attached to it,
 154          * take the opportunity to do some housekeeping before exiting.
 155          */
 156         do_housekeeping();
 157         }
 158
 159
 160 /*
 161  * Get a dynamic symbol number for per-session user data.
 162  * This API call should be made only ONCE per symbol per citserver run.
 163  */
 164 int CtdlGetDynamicSymbol()
 165 {
 166         static unsigned int next_symbol = SYM_MAX;
 167         return ++next_symbol;
 168 }
 169
 170
 171
 172 /*
 173  * Return a pointer to some generic per-session user data.
 174  * (This function returns NULL if the requested symbol is not allocated.)
 175  *
 176  * NOTE: we use critical sections for allocating and de-allocating these,
 177  *       but not for locating one.
 178  */
 179 void *CtdlGetUserData(unsigned long requested_sym)
 180 {
 181         struct CtdlSessData *ptr;
 182
 183         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)
 184                 if (ptr->sym_id == requested_sym)
 185                         return(ptr->sym_data);
 186
 187         lprintf(2, "ERROR! CtdlGetUserData(%ld) symbol not allocated\n",
 188                 requested_sym);
 189         return NULL;
 190 }
 191
 192
 193 /*
 194  * Allocate some generic per-session user data.
 195  */
 196 void CtdlAllocUserData(unsigned long requested_sym, size_t num_bytes)
 197 {
 198         struct CtdlSessData *ptr;
 199
 200         lprintf(9, "CtdlAllocUserData(%ld) called\n", requested_sym);
 201
 202         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 203                 if (ptr->sym_id == requested_sym) {
 204                         lprintf(2, "ERROR: CtdlAllocUserData() requested for"
 205                                 " symbol id %ld already registered\n",
 206                                 requested_sym);
 207                         return;
 208                 }
 209         }
 210
 211         ptr = mallok(sizeof(struct CtdlSessData));
 212         ptr->sym_id = requested_sym;
 213         ptr->sym_data = mallok(num_bytes);
 214
 215         begin_critical_section(S_SESSION_TABLE);
 216         ptr->next = CC->FirstSessData;
 217         CC->FirstSessData = ptr;
 218         end_critical_section(S_SESSION_TABLE);
 219
 220         lprintf(9, "CtdlAllocUserData(%ld) finished\n", requested_sym);
 221 }
 222
 223
 224
 225
 226
 227 /*
 228  * set_wtmpsupp()  -  alter the session listing
 229  */
 230 void set_wtmpsupp(char *newtext)
 231 {
 232         strncpy(CC->cs_room,newtext,sizeof CC->cs_room);
 233         CC->cs_room[sizeof CC->cs_room - 1] = 0;
 234         time(&CC->cs_lastupdt);
 235
 236         /* Run any routines registered by loadable modules */
 237         PerformSessionHooks(EVT_NEWROOM);
 238         }
 239
 240
 241 /*
 242  * call set_wtmpsupp() with the name of the current room, modified a bit...
 243  */
 244 void set_wtmpsupp_to_current_room() {
 245         if (CC->quickroom.QRflags & QR_PRIVATE) {
 246                 set_wtmpsupp("<private room>");
 247                 }
 248         else if (CC->quickroom.QRflags & QR_MAILBOX) {
 249                 set_wtmpsupp(&CC->quickroom.QRname[11]);
 250                 }
 251         else {
 252                 set_wtmpsupp(CC->quickroom.QRname);
 253                 }
 254         }
 255
 256
 257
 258 /*
 259  * cmd_info()  -  tell the client about this server
 260  */
 261 void cmd_info(void) {
 262         cprintf("%d Server info:\n",LISTING_FOLLOWS);
 263         cprintf("%d\n",CC->cs_pid);
 264         cprintf("%s\n",config.c_nodename);
 265         cprintf("%s\n",config.c_humannode);
 266         cprintf("%s\n",config.c_fqdn);
 267         cprintf("%s\n",CITADEL);
 268         cprintf("%d\n",REV_LEVEL);
 269         cprintf("%s\n",config.c_bbs_city);
 270         cprintf("%s\n",config.c_sysadm);
 271         cprintf("%d\n",SERVER_TYPE);
 272         cprintf("%s\n",config.c_moreprompt);
 273         cprintf("1\n"); /* 1 = yes, this system supports floors */
 274         cprintf("1\n"); /* 1 = we support the extended paging options */
 275         cprintf("000\n");
 276         }
 277
 278 void cmd_rchg(char *argbuf)
 279 {
 280         char newroomname[256]; /* set to 256 to prevent buffer overruns <dme>*/
 281
 282         extract(newroomname, argbuf, 0);
 283         newroomname[ROOMNAMELEN] = 0;
 284         if (strlen(newroomname) > 0) {
 285                 strncpy(CC->fake_roomname, newroomname, ROOMNAMELEN);
 286                 CC->fake_roomname[ROOMNAMELEN - 1] = 0;
 287                 }
 288         else {
 289                 strcpy(CC->fake_roomname, "");
 290                 }
 291         cprintf("%d OK\n", OK);
 292 }
 293
 294 void cmd_hchg(char *newhostname)
 295 {
 296    if ((newhostname) && (newhostname[0]))
 297    {
 298       memset(CC->fake_hostname, 0, 25);
 299       strncpy(CC->fake_hostname, newhostname, 24);
 300    }
 301    else
 302       strcpy(CC->fake_hostname, "");
 303    cprintf("%d OK\n",OK);
 304 }
 305
 306 void cmd_uchg(char *newusername)
 307 {
 308    if (CC->usersupp.axlevel < 6)
 309    {
 310       cprintf("%d You must be an Aide to use UCHG.\n",
 311                 ERROR+HIGHER_ACCESS_REQUIRED);
 312       return;
 313    }
 314    if ((newusername) && (newusername[0]))
 315    {
 316       CC->cs_flags &= ~CS_STEALTH;
 317       memset(CC->fake_username, 0, 32);
 318       if (strncasecmp(newusername, CC->curr_user, strlen(CC->curr_user)))
 319          strncpy(CC->fake_username, newusername, 31);
 320    }
 321    else
 322    {
 323       CC->fake_username[0] = '\0';
 324       CC->cs_flags |= CS_STEALTH;
 325    }
 326    cprintf("%d\n",OK);
 327 }
 328
 329 /*
 330  * returns an asterisk if there are any express messages waiting,
 331  * space otherwise.
 332  */
 333 char check_express(void) {
 334         if (CC->FirstExpressMessage == NULL) {
 335                 return(' ');
 336                 }
 337         else {
 338                 return('*');
 339                 }
 340         }
 341
 342 void cmd_time(void)
 343 {
 344    time_t tv;
 345
 346    tv = time(NULL);
 347
 348    cprintf("%d %ld\n", OK, tv);
 349 }
 350
 351 /*
 352  * Check whether two hostnames match.
 353  * "Realname" should be an actual name of a client that is trying to connect;
 354  * "testname" should be the value we are comparing it with. The idea is that we
 355  * want to compare with both the abbreviated and fully-qualified versions of
 356  * "testname;" some people define "localhost" as "localhost.foo.com," etc.
 357  */
 358 static int hostnames_match(const char *realname, const char *testname) {
 359         struct hostent *he;
 360         int retval = 0;
 361
 362         if (!strcasecmp(realname, testname))
 363                 return 1;
 364
 365 #ifdef HAVE_NONREENTRANT_NETDB
 366         begin_critical_section(S_NETDB);
 367 #endif
 368
 369         if ((he = gethostbyname(testname)) != NULL)
 370                 if (!strcasecmp(realname, he->h_name))
 371                         retval = 1;
 372
 373 #ifdef HAVE_NONREENTRANT_NETDB
 374         end_critical_section(S_NETDB);
 375 #endif
 376
 377         return retval;
 378         }
 379
 380 /*
 381  * check a hostname against the public_clients file
 382  */
 383 int is_public_client(char *where)
 384 {
 385         char buf[256];
 386         FILE *fp;
 387
 388         if (hostnames_match(where,"localhost")) return(1);
 389         if (hostnames_match(where,config.c_fqdn)) return(1);
 390
 391         fp = fopen("public_clients","r");
 392         if (fp == NULL) return(0);
 393
 394         while (fgets(buf,256,fp)!=NULL) {
 395                 while (isspace((buf[strlen(buf)-1])))
 396                         buf[strlen(buf)-1] = 0;
 397                 if (hostnames_match(where,buf)) {
 398                         fclose(fp);
 399                         return(1);
 400                         }
 401                 }
 402
 403         fclose(fp);
 404         return(0);
 405         }
 406
 407
 408 /*
 409  * the client is identifying itself to the server
 410  */
 411 void cmd_iden(char *argbuf)
 412 {
 413         int dev_code;
 414         int cli_code;
 415         int rev_level;
 416         char desc[256];
 417         char from_host[256];
 418         struct in_addr addr;
 419
 420         if (num_parms(argbuf)<4) {
 421                 cprintf("%d usage error\n",ERROR);
 422                 return;
 423                 }
 424
 425         dev_code = extract_int(argbuf,0);
 426         cli_code = extract_int(argbuf,1);
 427         rev_level = extract_int(argbuf,2);
 428         extract(desc,argbuf,3);
 429
 430         strncpy(from_host,config.c_fqdn,sizeof from_host);
 431         from_host[sizeof from_host - 1] = 0;
 432         if (num_parms(argbuf)>=5) extract(from_host,argbuf,4);
 433
 434         CC->cs_clientdev = dev_code;
 435         CC->cs_clienttyp = cli_code;
 436         CC->cs_clientver = rev_level;
 437         strncpy(CC->cs_clientname,desc,31);
 438         CC->cs_clientname[31] = 0;
 439
 440         if ((strlen(from_host)>0) &&
 441            (is_public_client(CC->cs_host))) {
 442                 if (inet_aton(from_host, &addr))
 443                         locate_host(CC->cs_host, &addr);
 444                 else {
 445                         strncpy(CC->cs_host,from_host,24);
 446                         CC->cs_host[24] = 0;
 447                         }
 448                 }
 449         set_wtmpsupp_to_current_room();
 450
 451         syslog(LOG_NOTICE,"client %d/%d/%01d.%02d (%s)\n",
 452                 dev_code,
 453                 cli_code,
 454                 (rev_level / 100),
 455                 (rev_level % 100),
 456                 desc);
 457                 cprintf("%d Ok\n",OK);
 458         }
 459
 460
 461 /*
 462  * enter or exit "stealth mode"
 463  */
 464 void cmd_stel(char *cmdbuf)
 465 {
 466         int requested_mode;
 467
 468         requested_mode = extract_int(cmdbuf,0);
 469         if (requested_mode !=0) requested_mode = 1;
 470
 471         if (!CC->logged_in) {
 472                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 473                 return;
 474                 }
 475
 476         if (CC->usersupp.axlevel < 6) {
 477                 cprintf("%d You must be an Aide to use stealth mode.\n",
 478                         ERROR+HIGHER_ACCESS_REQUIRED);
 479                 return;
 480                 }
 481
 482         if (CC->cs_flags & CS_STEALTH) {
 483                 if (requested_mode == 0)
 484                         CC->cs_flags = CC->cs_flags-CS_STEALTH;
 485                 }
 486         else {
 487                 if (requested_mode == 1)
 488                         CC->cs_flags = CC->cs_flags|CS_STEALTH;
 489                 }
 490
 491         set_wtmpsupp_to_current_room();
 492         cprintf("%d Ok\n",OK);
 493         }
 494
 495
 496
 497
 498 /*
 499  * display system messages or help
 500  */
 501 void cmd_mesg(char *mname)
 502 {
 503         FILE *mfp;
 504         char targ[256];
 505         char buf[256];
 506         char *dirs[2];
 507
 508         extract(buf,mname,0);
 509
 510
 511         dirs[0]=mallok(64);
 512         dirs[1]=mallok(64);
 513         strcpy(dirs[0],"messages");
 514         strcpy(dirs[1],"help");
 515         mesg_locate(targ,buf,2,dirs);
 516         phree(dirs[0]);
 517         phree(dirs[1]);
 518
 519
 520         if (strlen(targ)==0) {
 521                 cprintf("%d '%s' not found.\n",ERROR,mname);
 522                 return;
 523                 }
 524
 525         mfp = fopen(targ,"r");
 526         if (mfp==NULL) {
 527                 cprintf("%d Cannot open '%s': %s\n",
 528                         ERROR,targ,strerror(errno));
 529                 return;
 530                 }
 531         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
 532
 533         while (fgets(buf,255,mfp)!=NULL) {
 534                 buf[strlen(buf)-1] = 0;
 535                 do_help_subst(buf);
 536                 cprintf("%s\n",buf);
 537                 }
 538
 539         fclose(mfp);
 540         cprintf("000\n");
 541         }
 542
 543
 544 /*
 545  * enter system messages or help
 546  */
 547 void cmd_emsg(char *mname)
 548 {
 549         FILE *mfp;
 550         char targ[256];
 551         char buf[256];
 552         char *dirs[2];
 553         int a;
 554
 555         if (CC->usersupp.axlevel < 6) {
 556                 cprintf("%d You must be an Aide to edit system messages.\n",
 557                         ERROR+HIGHER_ACCESS_REQUIRED);
 558                 return;
 559                 }
 560
 561         extract(buf,mname,0);
 562         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 563                 if (buf[a] == '/') buf[a] = '.';
 564                 }
 565
 566         dirs[0]=mallok(64);
 567         dirs[1]=mallok(64);
 568         strcpy(dirs[0],"messages");
 569         strcpy(dirs[1],"help");
 570         mesg_locate(targ,buf,2,dirs);
 571         phree(dirs[0]);
 572         phree(dirs[1]);
 573
 574         if (strlen(targ)==0) {
 575                 snprintf(targ, sizeof targ, "./help/%s", buf);
 576                 }
 577
 578         mfp = fopen(targ,"w");
 579         if (mfp==NULL) {
 580                 cprintf("%d Cannot open '%s': %s\n",
 581                         ERROR,targ,strerror(errno));
 582                 return;
 583                 }
 584         cprintf("%d %s\n", SEND_LISTING, targ);
 585
 586         while (client_gets(buf), strcmp(buf, "000")) {
 587                 fprintf(mfp, "%s\n", buf);
 588                 }
 589
 590         fclose(mfp);
 591         }
 592
 593
 594 /*
 595  * who's online
 596  */
 597 void cmd_rwho(void) {
 598         struct CitContext *cptr;
 599         int spoofed = 0;
 600         int aide;
 601         char un[40], room[40], host[40], flags[5];
 602
 603         aide = CC->usersupp.axlevel >= 6;
 604         cprintf("%d\n",LISTING_FOLLOWS);
 605
 606         for (cptr = ContextList; cptr != NULL; cptr = cptr->next)
 607         {
 608                 flags[0] = '\0';
 609                 spoofed = 0;
 610
 611                 if (cptr->cs_flags & CS_POSTING)
 612                    strcat(flags, "*");
 613                 else
 614                    strcat(flags, ".");
 615
 616                 if (cptr->fake_username[0])
 617                 {
 618                    strcpy(un, cptr->fake_username);
 619                    spoofed = 1;
 620                 }
 621                 else
 622                    strcpy(un, cptr->curr_user);
 623
 624                 if (cptr->fake_hostname[0])
 625                 {
 626                    strcpy(host, cptr->fake_hostname);
 627                    spoofed = 1;
 628                 }
 629                 else
 630                    strcpy(host, cptr->cs_host);
 631
 632                 if (cptr->fake_roomname[0])
 633                 {
 634                    strcpy(room, cptr->fake_roomname);
 635                    spoofed = 1;
 636                 }
 637                 else
 638                    strcpy(room, cptr->cs_room);
 639
 640
 641                 if ((aide) && (spoofed))
 642                    strcat(flags, "+");
 643
 644                 if ((cptr->cs_flags & CS_STEALTH) && (aide))
 645                    strcat(flags, "-");
 646
 647                 if (((cptr->cs_flags&CS_STEALTH)==0) || (aide))
 648                 {
 649                         cprintf("%d|%s|%s|%s|%s|%ld|%s|%s\n",
 650                                 cptr->cs_pid, un, room,
 651                                 host, cptr->cs_clientname,
 652                                 (long)(cptr->lastidle),
 653                                 cptr->lastcmdname, flags);
 654                 }
 655                 if ((spoofed) && (aide))
 656                 {
 657                         cprintf("%d|%s|%s|%s|%s|%ld|%s|%s\n",
 658                                 cptr->cs_pid, cptr->curr_user, cptr->cs_room,
 659                                 cptr->cs_host, cptr->cs_clientname,
 660                                 (long)(cptr->lastidle),
 661                                 cptr->lastcmdname, flags);
 662
 663                 }
 664         }
 665         cprintf("000\n");
 666         }
 667
 668
 669 /*
 670  * Terminate another running session
 671  */
 672 void cmd_term(char *cmdbuf)
 673 {
 674         int session_num;
 675         struct CitContext *ccptr;
 676         int session_to_kill = 0;
 677
 678         if (!CC->logged_in) {
 679                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 680                 return;
 681                 }
 682
 683         if (CC->usersupp.axlevel < 6) {
 684                 cprintf("%d You must be an Aide to terminate sessions.\n",
 685                         ERROR+HIGHER_ACCESS_REQUIRED);
 686                 return;
 687                 }
 688
 689         session_num = extract_int(cmdbuf, 0);
 690         if (session_num == CC->cs_pid) {
 691                 cprintf("%d You can't kill your own session.\n", ERROR);
 692                 return;
 693                 }
 694
 695         lprintf(9, "Locating session to kill\n");
 696         begin_critical_section(S_SESSION_TABLE);
 697         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 698                 if (session_num == ccptr->cs_pid) {
 699                         session_to_kill = ccptr->cs_pid;
 700                         }
 701                 }
 702         end_critical_section(S_SESSION_TABLE);
 703         lprintf(9, "session_to_kill == %d\n", session_to_kill);
 704
 705         if (session_to_kill > 0) {
 706                 lprintf(9, "calling kill_session()\n");
 707                 kill_session(session_to_kill);
 708                 cprintf("%d Session terminated.\n", OK);
 709                 }
 710         else {
 711                 cprintf("%d No such session.\n", ERROR);
 712                 }
 713         }
 714
 715
 716
 717
 718
 719 /*
 720  * get the paginator prompt
 721  */
 722 void cmd_more(void) {
 723         cprintf("%d %s\n",OK,config.c_moreprompt);
 724         }
 725
 726 /*
 727  * echo
 728  */
 729 void cmd_echo(char *etext)
 730 {
 731         cprintf("%d %s\n",OK,etext);
 732         }
 733
 734
 735
 736 /*
 737  * identify as internal program
 738  */
 739 void cmd_ipgm(char *argbuf)
 740 {
 741         int secret;
 742
 743         secret = extract_int(argbuf, 0);
 744         if (secret == config.c_ipgm_secret) {
 745                 CC->internal_pgm = 1;
 746                 strcpy(CC->curr_user, "<internal program>");
 747                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 748                 cprintf("%d Authenticated as an internal program.\n",OK);
 749                 }
 750         else {
 751                 cprintf("%d Authentication failed.\n",ERROR);
 752                 }
 753         }
 754
 755
 756 /*
 757  * Shut down the server
 758  */
 759 void cmd_down(void) {
 760         if (!CC->logged_in) {
 761                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 762                 return;
 763                 }
 764
 765         if (CC->usersupp.axlevel < 6) {
 766                 cprintf("%d You must be an Aide to shut down the server.\n",
 767                         ERROR+HIGHER_ACCESS_REQUIRED);
 768                 return;
 769                 }
 770
 771         cprintf("%d Shutting down server.  Goodbye.\n", OK);
 772         master_cleanup();
 773         }
 774
 775 /*
 776  * Schedule or cancel a server shutdown
 777  */
 778 void cmd_scdn(char *argbuf)
 779 {
 780         int new_state;
 781
 782         if (!CC->logged_in) {
 783                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 784                 return;
 785                 }
 786
 787         if (CC->usersupp.axlevel < 6) {
 788                 cprintf("%d You must be an Aide to schedule a shutdown.\n",
 789                         ERROR+HIGHER_ACCESS_REQUIRED);
 790                 return;
 791                 }
 792
 793         new_state = extract_int(argbuf, 0);
 794         if ((new_state == 0) || (new_state == 1)) {
 795                 ScheduledShutdown = new_state;
 796                 }
 797         cprintf("%d %d\n", OK, ScheduledShutdown);
 798         }
 799
 800
 801 /*
 802  * main context loop
 803  */
 804 void *context_loop(struct CitContext *con)
 805 {
 806         char cmdbuf[256];
 807         int num_sessions, len;
 808         struct sockaddr_in sin;
 809
 810         /*
 811          * Wedge our way into the context table.
 812          */
 813         InitMyContext(con);
 814
 815         /*
 816          * Initialize some variables specific to our context.
 817          */
 818         CC->logged_in = 0;
 819         CC->internal_pgm = 0;
 820         CC->download_fp = NULL;
 821         CC->upload_fp = NULL;
 822         CC->cs_pid = con->client_socket;        /* not necessarily portable */
 823         CC->FirstExpressMessage = NULL;
 824         CC->msglist = NULL;
 825         CC->num_msgs = 0;
 826         time(&CC->lastcmd);
 827         time(&CC->lastidle);
 828         strcpy(CC->lastcmdname, "    ");
 829         strcpy(CC->cs_clientname, "(unknown)");
 830         strcpy(CC->curr_user,"(not logged in)");
 831         strcpy(CC->net_node,"");
 832         snprintf(CC->temp, sizeof CC->temp, tmpnam(NULL));
 833         strcpy(CC->cs_room, "(no room)");
 834         strncpy(CC->cs_host, config.c_fqdn, sizeof CC->cs_host);
 835         CC->cs_host[sizeof CC->cs_host - 1] = 0;
 836         len = sizeof sin;
 837         if (!getpeername(CC->client_socket, (struct sockaddr *) &sin, &len))
 838                 locate_host(CC->cs_host, &sin.sin_addr);
 839         CC->cs_flags = 0;
 840         CC->upload_type = UPL_FILE;
 841         CC->dl_is_net = 0;
 842         CC->FirstSessData = NULL;
 843
 844         num_sessions = session_count();
 845         CC->nologin = 0;
 846         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 847                 CC->nologin = 1;
 848
 849         if (CC->nologin==1) {
 850            cprintf("%d %s: Too many users are already online (maximum is %d)\n",
 851                 ERROR+MAX_SESSIONS_EXCEEDED,
 852                 config.c_nodename,config.c_maxsessions);
 853                 }
 854         else {
 855            cprintf("%d %s Citadel/UX server ready.\n",OK,config.c_nodename);
 856                 }
 857
 858         lprintf(3, "citserver[%3d]: started.\n", CC->cs_pid);
 859
 860         /* Run any session startup routines registered by loadable modules */
 861         PerformSessionHooks(EVT_START);
 862
 863         rec_log(CL_CONNECT, "");
 864
 865         do {
 866                 time(&CC->lastcmd);
 867                 memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 868                 if (client_gets(cmdbuf) < 1) cleanup(EXIT_NULL);
 869                 lprintf(5, "citserver[%3d]: %s\n", CC->cs_pid, cmdbuf);
 870
 871                 /*
 872                  * Let other clients see the last command we executed, and
 873                  * update the idle time, but not NOOP, PEXP, or GEXP.
 874                  */
 875                 if ( (strncasecmp(cmdbuf, "NOOP", 4))
 876                    && (strncasecmp(cmdbuf, "PEXP", 4))
 877                    && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
 878                         strcpy(CC->lastcmdname, "    ");
 879                         strncpy(CC->lastcmdname, cmdbuf, 4);
 880                         time(&CC->lastidle);
 881                         }
 882
 883                 if ((strncasecmp(cmdbuf, "ENT0", 4)) && (strncasecmp(cmdbuf, "MESG", 4)) && (strncasecmp(cmdbuf, "MSGS", 4)))
 884                 {
 885                    CC->cs_flags &= ~CS_POSTING;
 886                 }
 887
 888 /*
 889  * This loop recognizes all server commands.
 890  */
 891
 892                 if (!strncasecmp(cmdbuf,"NOOP",4)) {
 893                         cprintf("%d%cok\n",OK,check_express());
 894                         }
 895
 896                 else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 897                         cprintf("%d Goodbye.\n",OK);
 898                         }
 899
 900                 else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 901                         if (CC->logged_in) logout(CC);
 902                         cprintf("%d logged out.\n",OK);
 903                         }
 904
 905                 else if (!strncasecmp(cmdbuf,"USER",4)) {
 906                         cmd_user(&cmdbuf[5]);
 907                         }
 908
 909                 else if (!strncasecmp(cmdbuf,"PASS",4)) {
 910                         cmd_pass(&cmdbuf[5]);
 911                         }
 912
 913                 else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 914                         cmd_newu(&cmdbuf[5]);
 915                         }
 916
 917                 else if (!strncasecmp(cmdbuf,"SETP",4)) {
 918                         cmd_setp(&cmdbuf[5]);
 919                         }
 920
 921                 else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 922                         cmd_lrms(&cmdbuf[5]);
 923                         }
 924
 925                 else if (!strncasecmp(cmdbuf,"LKRA",4)) {
 926                         cmd_lkra(&cmdbuf[5]);
 927                         }
 928
 929                 else if (!strncasecmp(cmdbuf,"LKRN",4)) {
 930                         cmd_lkrn(&cmdbuf[5]);
 931                         }
 932
 933                 else if (!strncasecmp(cmdbuf,"LKRO",4)) {
 934                         cmd_lkro(&cmdbuf[5]);
 935                         }
 936
 937                 else if (!strncasecmp(cmdbuf,"LZRM",4)) {
 938                         cmd_lzrm(&cmdbuf[5]);
 939                         }
 940
 941                 else if (!strncasecmp(cmdbuf,"GETU",4)) {
 942                         cmd_getu();
 943                         }
 944
 945                 else if (!strncasecmp(cmdbuf,"SETU",4)) {
 946                         cmd_setu(&cmdbuf[5]);
 947                         }
 948
 949                 else if (!strncasecmp(cmdbuf,"GOTO",4)) {
 950                         cmd_goto(&cmdbuf[5]);
 951                         }
 952
 953                 else if (!strncasecmp(cmdbuf,"MSGS",4)) {
 954                         cmd_msgs(&cmdbuf[5]);
 955                         }
 956
 957                 else if (!strncasecmp(cmdbuf,"WHOK",4)) {
 958                         cmd_whok();
 959                         }
 960
 961                 else if (!strncasecmp(cmdbuf,"RDIR",4)) {
 962                         cmd_rdir();
 963                         }
 964
 965                 else if (!strncasecmp(cmdbuf,"MSG0",4)) {
 966                         cmd_msg0(&cmdbuf[5]);
 967                         }
 968
 969                 else if (!strncasecmp(cmdbuf,"MSG2",4)) {
 970                         cmd_msg2(&cmdbuf[5]);
 971                         }
 972
 973                 else if (!strncasecmp(cmdbuf,"MSG3",4)) {
 974                         cmd_msg3(&cmdbuf[5]);
 975                         }
 976
 977                 else if (!strncasecmp(cmdbuf,"MSG4",4)) {
 978                         cmd_msg4(&cmdbuf[5]);
 979                         }
 980
 981                 else if (!strncasecmp(cmdbuf,"OPNA",4)) {
 982                         cmd_opna(&cmdbuf[5]);
 983                         }
 984
 985                 else if (!strncasecmp(cmdbuf,"INFO",4)) {
 986                         cmd_info();
 987                         }
 988
 989                 else if (!strncasecmp(cmdbuf,"SLRP",4)) {
 990                         cmd_slrp(&cmdbuf[5]);
 991                         }
 992
 993                 else if (!strncasecmp(cmdbuf,"INVT",4)) {
 994                         cmd_invt_kick(&cmdbuf[5],1);
 995                         }
 996
 997                 else if (!strncasecmp(cmdbuf,"KICK",4)) {
 998                         cmd_invt_kick(&cmdbuf[5],0);
 999                         }
1000
1001                 else if (!strncasecmp(cmdbuf,"GETR",4)) {
1002                         cmd_getr();
1003                         }
1004
1005                 else if (!strncasecmp(cmdbuf,"SETR",4)) {
1006                         cmd_setr(&cmdbuf[5]);
1007                         }
1008
1009                 else if (!strncasecmp(cmdbuf,"GETA",4)) {
1010                         cmd_geta();
1011                         }
1012
1013                 else if (!strncasecmp(cmdbuf,"SETA",4)) {
1014                         cmd_seta(&cmdbuf[5]);
1015                         }
1016
1017                 else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1018                         cmd_ent0(&cmdbuf[5]);
1019                         }
1020
1021                 else if (!strncasecmp(cmdbuf,"ENT3",4)) {
1022                         cmd_ent3(&cmdbuf[5]);
1023                         }
1024
1025                 else if (!strncasecmp(cmdbuf,"RINF",4)) {
1026                         cmd_rinf();
1027                         }
1028
1029                 else if (!strncasecmp(cmdbuf,"DELE",4)) {
1030                         cmd_dele(&cmdbuf[5]);
1031                         }
1032
1033                 else if (!strncasecmp(cmdbuf,"KILL",4)) {
1034                         cmd_kill(&cmdbuf[5]);
1035                         }
1036
1037                 else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1038                         cmd_cre8(&cmdbuf[5]);
1039                         }
1040
1041                 else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1042                         cmd_move(&cmdbuf[5]);
1043                         }
1044
1045                 else if (!strncasecmp(cmdbuf,"FORG",4)) {
1046                         cmd_forg();
1047                         }
1048
1049                 else if (!strncasecmp(cmdbuf,"MESG",4)) {
1050                         cmd_mesg(&cmdbuf[5]);
1051                         }
1052
1053                 else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1054                         cmd_emsg(&cmdbuf[5]);
1055                         }
1056
1057                 else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1058                         cmd_gnur();
1059                         }
1060
1061                 else if (!strncasecmp(cmdbuf,"GREG",4)) {
1062                         cmd_greg(&cmdbuf[5]);
1063                         }
1064
1065                 else if (!strncasecmp(cmdbuf,"VALI",4)) {
1066                         cmd_vali(&cmdbuf[5]);
1067                         }
1068
1069                 else if (!strncasecmp(cmdbuf,"EINF",4)) {
1070                         cmd_einf(&cmdbuf[5]);
1071                         }
1072
1073                 else if (!strncasecmp(cmdbuf,"LIST",4)) {
1074                         cmd_list();
1075                         }
1076
1077                 else if (!strncasecmp(cmdbuf,"REGI",4)) {
1078                         cmd_regi();
1079                         }
1080
1081                 else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1082                         cmd_chek();
1083                         }
1084
1085                 else if (!strncasecmp(cmdbuf,"DELF",4)) {
1086                         cmd_delf(&cmdbuf[5]);
1087                         }
1088
1089                 else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1090                         cmd_movf(&cmdbuf[5]);
1091                         }
1092
1093                 else if (!strncasecmp(cmdbuf,"NETF",4)) {
1094                         cmd_netf(&cmdbuf[5]);
1095                         }
1096
1097                 else if (!strncasecmp(cmdbuf,"RWHO",4)) {
1098                         cmd_rwho();
1099                         }
1100
1101                 else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1102                         cmd_open(&cmdbuf[5]);
1103                         }
1104
1105                 else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1106                         cmd_clos();
1107                         }
1108
1109                 else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1110                         cmd_uopn(&cmdbuf[5]);
1111                         }
1112
1113                 else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1114                         cmd_ucls(&cmdbuf[5]);
1115                         }
1116
1117                 else if (!strncasecmp(cmdbuf,"READ",4)) {
1118                         cmd_read(&cmdbuf[5]);
1119                         }
1120
1121                 else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1122                         cmd_writ(&cmdbuf[5]);
1123                         }
1124
1125                 else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1126                         cmd_qusr(&cmdbuf[5]);
1127                         }
1128
1129                 else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1130                         cmd_echo(&cmdbuf[5]);
1131                         }
1132
1133                 else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1134                         cmd_oimg(&cmdbuf[5]);
1135                         }
1136
1137                 else if (!strncasecmp(cmdbuf,"MORE",4)) {
1138                         cmd_more();
1139                         }
1140
1141                 else if (!strncasecmp(cmdbuf,"NETP",4)) {
1142                         cmd_netp(&cmdbuf[5]);
1143                         }
1144
1145                 else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1146                         cmd_ndop(&cmdbuf[5]);
1147                         }
1148
1149                 else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1150                         cmd_nuop(&cmdbuf[5]);
1151                         }
1152
1153                 else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1154                         cmd_lflr();
1155                         }
1156
1157                 else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1158                         cmd_cflr(&cmdbuf[5]);
1159                         }
1160
1161                 else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1162                         cmd_kflr(&cmdbuf[5]);
1163                         }
1164
1165                 else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1166                         cmd_eflr(&cmdbuf[5]);
1167                         }
1168
1169                 else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1170                         cmd_iden(&cmdbuf[5]);
1171                         }
1172
1173                 else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1174                         cmd_ipgm(&cmdbuf[5]);
1175                         }
1176
1177                 else if (!strncasecmp(cmdbuf,"EBIO",4)) {
1178                         cmd_ebio();
1179                         }
1180
1181                 else if (!strncasecmp(cmdbuf,"RBIO",4)) {
1182                         cmd_rbio(&cmdbuf[5]);
1183                         }
1184
1185                 else if (!strncasecmp(cmdbuf,"LBIO",4)) {
1186                         cmd_lbio();
1187                         }
1188
1189                 else if (!strncasecmp(cmdbuf,"STEL",4)) {
1190                         cmd_stel(&cmdbuf[5]);
1191                         }
1192
1193                 else if (!strncasecmp(cmdbuf,"TERM",4)) {
1194                         cmd_term(&cmdbuf[5]);
1195                         }
1196
1197                 else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1198                         cmd_down();
1199                         }
1200
1201                 else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1202                         cmd_scdn(&cmdbuf[5]);
1203                         }
1204
1205                 else if (!strncasecmp(cmdbuf, "NSET", 4)) {
1206                         cmd_nset(&cmdbuf[5]);
1207                         }
1208
1209                 else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1210                         cmd_uimg(&cmdbuf[5]);
1211                         }
1212
1213                 else if (!strncasecmp(cmdbuf, "UCHG", 4)) {
1214                         cmd_uchg(&cmdbuf[5]);
1215                         }
1216
1217                 else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1218                         cmd_time();
1219                         }
1220
1221                 else if (!strncasecmp(cmdbuf, "HCHG", 4)) {
1222                         cmd_hchg(&cmdbuf[5]);
1223                         }
1224
1225                 else if (!strncasecmp(cmdbuf, "RCHG", 4)) {
1226                         cmd_rchg(&cmdbuf[5]);
1227                         }
1228
1229                 else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1230                         cmd_agup(&cmdbuf[5]);
1231                         }
1232
1233                 else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1234                         cmd_asup(&cmdbuf[5]);
1235                         }
1236
1237                 else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1238                         cmd_gpex(&cmdbuf[5]);
1239                         }
1240
1241                 else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1242                         cmd_spex(&cmdbuf[5]);
1243                         }
1244
1245                 else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1246                         cmd_conf(&cmdbuf[5]);
1247                         }
1248
1249 #ifdef DEBUG_MEMORY_LEAKS
1250                 else if (!strncasecmp(cmdbuf, "LEAK", 4)) {
1251                         dump_tracked();
1252                         }
1253 #endif
1254
1255                 else if (!DLoader_Exec_Cmd(cmdbuf))
1256                         {
1257                            cprintf("%d Unrecognized or unsupported command.\n",
1258                                     ERROR);
1259                         }
1260
1261                 /* Run any after-each-command outines registered by modules */
1262                 PerformSessionHooks(EVT_CMD);
1263
1264                 } while(strncasecmp(cmdbuf, "QUIT", 4));
1265
1266         cleanup(EXIT_NORMAL);
1267         return(NULL);
1268         }