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