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