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