citadel/citserver.c

   1 /*
   2  * $Id$
   3  *
   4  * Main source module for the Citadel server
   5  *
   6  */
   7
   8 #include "sysdep.h"
   9 #include <stdlib.h>
  10 #include <unistd.h>
  11 #include <stdio.h>
  12 #include <fcntl.h>
  13 #include <signal.h>
  14 #include <time.h>
  15 #include <ctype.h>
  16 #include <string.h>
  17 #include <errno.h>
  18 #include <limits.h>
  19 #include <syslog.h>
  20 /* #include <dlfcn.h> */
  21 #include <netdb.h>
  22 #include <sys/types.h>
  23 #include <sys/socket.h>
  24 #include <sys/time.h>
  25 #include <netinet/in.h>
  26 #include <arpa/inet.h>
  27 #include "citadel.h"
  28 #include "server.h"
  29 #include "sysdep_decls.h"
  30 #include "citserver.h"
  31 #include "config.h"
  32 #include "database.h"
  33 #include "housekeeping.h"
  34 #include "user_ops.h"
  35 #include "logging.h"
  36 #include "msgbase.h"
  37 #include "support.h"
  38 #include "locate_host.h"
  39 #include "room_ops.h"
  40 #include "file_ops.h"
  41 #include "dynloader.h"
  42 #include "policy.h"
  43 #include "control.h"
  44 #include "tools.h"
  45
  46 struct CitContext *ContextList = NULL;
  47 char *unique_session_numbers;
  48 int ScheduledShutdown = 0;
  49 int do_defrag = 0;
  50
  51 /*
  52  * Various things that need to be initialized at startup
  53  */
  54 void master_startup(void) {
  55         struct timeval tv;
  56
  57         lprintf(9, "master_startup() started\n");
  58         lprintf(7, "Opening databases\n");
  59         open_databases();
  60         cdb_begin_transaction();
  61
  62         if (do_defrag) {
  63                 defrag_databases();
  64         }
  65
  66         check_ref_counts();
  67
  68         lprintf(7, "Creating base rooms (if necessary)\n");
  69         create_room(BASEROOM,           0, "", 0);
  70         create_room(AIDEROOM,           3, "", 0);
  71         create_room(SYSCONFIGROOM,      3, "", 0);
  72         create_room(config.c_twitroom,  0, "", 0);
  73
  74         lprintf(7, "Seeding the pseudo-random number generator...\n");
  75         gettimeofday(&tv, NULL);
  76         srand(tv.tv_usec);
  77         lprintf(9, "master_startup() finished\n");
  78 }
  79
  80
  81
  82 /*
  83  * Cleanup routine to be called when the server is shutting down.
  84  */
  85 void master_cleanup(void) {
  86         struct CleanupFunctionHook *fcn;
  87
  88         /* Cancel all running sessions */
  89         lprintf(7, "Cancelling running sessions...\n");
  90
  91 /* FIXME do something here
  92         while (ContextList != NULL) {
  93                 }
  94  */
  95
  96         /* Run any cleanup routines registered by loadable modules */
  97         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
  98                 (*fcn->h_function_pointer)();
  99         }
 100
 101         /* Close databases */
 102         lprintf(7, "Closing databases\n");
 103         cdb_end_transaction();
 104         close_databases();
 105
 106         /* Do system-dependent stuff */
 107         sysdep_master_cleanup();
 108
 109         /* Now go away. */
 110         lprintf(3, "citserver: exiting.\n");
 111         fflush(stdout); fflush(stderr);
 112         exit(0);
 113 }
 114
 115
 116 /*
 117  * Free any per-session data allocated by modules or whatever
 118  */
 119 void deallocate_user_data(struct CitContext *con)
 120 {
 121         struct CtdlSessData *ptr;
 122
 123         begin_critical_section(S_SESSION_TABLE);
 124         while (con->FirstSessData != NULL) {
 125                 lprintf(9, "Deallocating user data symbol %ld\n",
 126                         con->FirstSessData->sym_id);
 127                 if (con->FirstSessData->sym_data != NULL)
 128                         phree(con->FirstSessData->sym_data);
 129                 ptr = con->FirstSessData->next;
 130                 phree(con->FirstSessData);
 131                 con->FirstSessData = ptr;
 132         }
 133         end_critical_section(S_SESSION_TABLE);
 134 }
 135
 136
 137
 138
 139 /*
 140  * Terminate a session and remove its context data structure.
 141  */
 142 void RemoveContext (struct CitContext *con)
 143 {
 144         struct CitContext *ptr = NULL;
 145         struct CitContext *ToFree = NULL;
 146
 147         lprintf(9, "RemoveContext() called\n");
 148         if (con==NULL) {
 149                 lprintf(5, "WARNING: RemoveContext() called with NULL!\n");
 150                 return;
 151                 }
 152
 153         /* Remove the context from the global context list.  This needs
 154          * to get done FIRST to avoid concurrency problems.  It is *vitally*
 155          * important to keep num_sessions accurate!!
 156          */
 157         lprintf(7, "Removing context for session %d\n", con->cs_pid);
 158         begin_critical_section(S_SESSION_TABLE);
 159         if (ContextList == con) {
 160                 ToFree = ContextList;
 161                 ContextList = ContextList->next;
 162                 --num_sessions;
 163                 }
 164         else {
 165                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
 166                         if (ptr->next == con) {
 167                                 ToFree = ptr->next;
 168                                 ptr->next = ptr->next->next;
 169                                 --num_sessions;
 170                                 }
 171                         }
 172                 }
 173         end_critical_section(S_SESSION_TABLE);
 174
 175         if (ToFree == NULL) {
 176                 lprintf(9, "RemoveContext() found nothing to remove\n");
 177                 return;
 178         }
 179
 180         /* Run any cleanup routines registered by loadable modules.
 181          * Note 1: This must occur *before* deallocate_user_data() because the
 182          *         cleanup functions might touch dynamic session data.
 183          * Note 2: We have to "become_session()" because the cleanup functions
 184          *         might make references to "CC" assuming it's the right one.
 185          */
 186         become_session(con);
 187         PerformSessionHooks(EVT_STOP);
 188         become_session(NULL);
 189
 190         /* Now handle all of the administrivia. */
 191         lprintf(7, "Calling logout(%d)\n", con->cs_pid);
 192         logout(con);
 193
 194         rec_log(CL_TERMINATE, con->curr_user);
 195         unlink(con->temp);
 196         lprintf(3, "citserver[%3d]: ended.\n", con->cs_pid);
 197
 198
 199         syslog(LOG_NOTICE,"session %d: ended", con->cs_pid);
 200
 201         /* Deallocate any user-data attached to this session */
 202         deallocate_user_data(con);
 203
 204         /* If the client is still connected, blow 'em away. */
 205         lprintf(7, "Closing socket %d\n", con->client_socket);
 206         close(con->client_socket);
 207
 208         /* This is where we used to check for scheduled shutdowns. */
 209
 210         /* Free up the memory used by this context */
 211         phree(con);
 212
 213         lprintf(7, "Done with RemoveContext()\n");
 214 }
 215
 216
 217
 218 /*
 219  * Get a dynamic symbol number for per-session user data.
 220  * This API call should be made only ONCE per symbol per citserver run.
 221  */
 222 int CtdlGetDynamicSymbol()
 223 {
 224         static unsigned int next_symbol = SYM_MAX;
 225         return ++next_symbol;
 226 }
 227
 228
 229
 230 /*
 231  * Return a pointer to some generic per-session user data.
 232  * (This function returns NULL if the requested symbol is not allocated.)
 233  *
 234  * NOTE: we use critical sections for allocating and de-allocating these,
 235  *       but not for locating one.
 236  */
 237 void *CtdlGetUserData(unsigned long requested_sym)
 238 {
 239         struct CtdlSessData *ptr;
 240
 241         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)
 242                 if (ptr->sym_id == requested_sym)
 243                         return(ptr->sym_data);
 244
 245         lprintf(2, "ERROR! CtdlGetUserData(%ld) symbol not allocated\n",
 246                 requested_sym);
 247         return NULL;
 248 }
 249
 250
 251 /*
 252  * Allocate some generic per-session user data.
 253  */
 254 void CtdlAllocUserData(unsigned long requested_sym, size_t num_bytes)
 255 {
 256         struct CtdlSessData *ptr;
 257
 258         lprintf(9, "CtdlAllocUserData(%ld) called\n", requested_sym);
 259
 260         /* Fail silently if the symbol is already registered. */
 261         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 262                 if (ptr->sym_id == requested_sym) {
 263                         return;
 264                 }
 265         }
 266
 267         /* Grab us some memory!  Dem's good eatin' !!  */
 268         ptr = mallok(sizeof(struct CtdlSessData));
 269         ptr->sym_id = requested_sym;
 270         ptr->sym_data = mallok(num_bytes);
 271         memset(ptr->sym_data, 0, num_bytes);
 272
 273         begin_critical_section(S_SESSION_TABLE);
 274         ptr->next = CC->FirstSessData;
 275         CC->FirstSessData = ptr;
 276         end_critical_section(S_SESSION_TABLE);
 277
 278         lprintf(9, "CtdlAllocUserData(%ld) finished\n", requested_sym);
 279 }
 280
 281
 282 /*
 283  * Change the size of a buffer allocated with CtdlAllocUserData()
 284  */
 285 void CtdlReallocUserData(unsigned long requested_sym, size_t num_bytes)
 286 {
 287         struct CtdlSessData *ptr;
 288
 289         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 290                 if (ptr->sym_id == requested_sym) {
 291                         ptr->sym_data = reallok(ptr->sym_data, num_bytes);
 292                         return;
 293                 }
 294         }
 295
 296         lprintf(2, "CtdlReallocUserData() ERROR: symbol %ld not found!\n",
 297                 requested_sym);
 298 }
 299
 300
 301
 302
 303
 304
 305 /*
 306  * cmd_info()  -  tell the client about this server
 307  */
 308 void cmd_info(void) {
 309         cprintf("%d Server info:\n", LISTING_FOLLOWS);
 310         cprintf("%d\n", CC->cs_pid);
 311         cprintf("%s\n", config.c_nodename);
 312         cprintf("%s\n", config.c_humannode);
 313         cprintf("%s\n", config.c_fqdn);
 314         cprintf("%s\n", CITADEL);
 315         cprintf("%d\n", REV_LEVEL);
 316         cprintf("%s\n", config.c_bbs_city);
 317         cprintf("%s\n", config.c_sysadm);
 318         cprintf("%d\n", SERVER_TYPE);
 319         cprintf("%s\n", config.c_moreprompt);
 320         cprintf("1\n"); /* 1 = yes, this system supports floors */
 321         cprintf("1\n"); /* 1 = we support the extended paging options */
 322         cprintf("%s\n", CC->cs_nonce);
 323         cprintf("000\n");
 324 }
 325
 326
 327 /*
 328  * returns an asterisk if there are any express messages waiting,
 329  * space otherwise.
 330  */
 331 char CtdlCheckExpress(void) {
 332         if (CC->FirstExpressMessage == NULL) {
 333                 return(' ');
 334                 }
 335         else {
 336                 return('*');
 337                 }
 338         }
 339
 340 void cmd_time(void)
 341 {
 342    time_t tv;
 343
 344    tv = time(NULL);
 345
 346    cprintf("%d %ld\n", OK, tv);
 347 }
 348
 349 /*
 350  * Check whether two hostnames match.
 351  * "Realname" should be an actual name of a client that is trying to connect;
 352  * "testname" should be the value we are comparing it with. The idea is that we
 353  * want to compare with both the abbreviated and fully-qualified versions of
 354  * "testname;" some people define "localhost" as "localhost.foo.com," etc.
 355  */
 356 static int hostnames_match(const char *realname, const char *testname) {
 357         struct hostent *he;
 358         int retval = 0;
 359
 360         if (!strcasecmp(realname, testname))
 361                 return 1;
 362
 363 #ifdef HAVE_NONREENTRANT_NETDB
 364         begin_critical_section(S_NETDB);
 365 #endif
 366
 367         if ((he = gethostbyname(testname)) != NULL)
 368                 if (!strcasecmp(realname, he->h_name))
 369                         retval = 1;
 370
 371 #ifdef HAVE_NONREENTRANT_NETDB
 372         end_critical_section(S_NETDB);
 373 #endif
 374
 375         return retval;
 376         }
 377
 378 /*
 379  * check a hostname against the public_clients file
 380  */
 381 int is_public_client(char *where)
 382 {
 383         char buf[256];
 384         FILE *fp;
 385
 386         lprintf(9, "Checking whether %s is a public client\n", where);
 387
 388         if (hostnames_match(where, "localhost")) return(1);
 389         if (hostnames_match(where, config.c_fqdn)) return(1);
 390
 391         fp = fopen("public_clients","r");
 392         if (fp == NULL) return(0);
 393
 394         while (fgets(buf,256,fp)!=NULL) {
 395                 while (isspace((buf[strlen(buf)-1])))
 396                         buf[strlen(buf)-1] = 0;
 397                 if (hostnames_match(where,buf)) {
 398                         fclose(fp);
 399                         return(1);
 400                         }
 401                 }
 402
 403         fclose(fp);
 404         return(0);
 405         }
 406
 407
 408 /*
 409  * the client is identifying itself to the server
 410  */
 411 void cmd_iden(char *argbuf)
 412 {
 413         int dev_code;
 414         int cli_code;
 415         int rev_level;
 416         char desc[256];
 417         char from_host[256];
 418         struct in_addr addr;
 419         int do_lookup = 0;
 420
 421         if (num_parms(argbuf)<4) {
 422                 cprintf("%d usage error\n",ERROR);
 423                 return;
 424         }
 425
 426         dev_code = extract_int(argbuf,0);
 427         cli_code = extract_int(argbuf,1);
 428         rev_level = extract_int(argbuf,2);
 429         extract(desc,argbuf,3);
 430
 431         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 432         from_host[sizeof from_host - 1] = 0;
 433         if (num_parms(argbuf)>=5) extract(from_host,argbuf,4);
 434
 435         CC->cs_clientdev = dev_code;
 436         CC->cs_clienttyp = cli_code;
 437         CC->cs_clientver = rev_level;
 438         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 439         CC->cs_clientname[31] = 0;
 440
 441         if (strlen(from_host) > 0) {
 442                 if (CC->is_local_socket) do_lookup = 1;
 443                 else if (is_public_client(CC->cs_host)) do_lookup = 1;
 444         }
 445
 446         if (do_lookup) {
 447                 lprintf(9, "Looking up hostname '%s'\n", from_host);
 448                 if ((addr.s_addr = inet_addr(from_host)) != -1) {
 449                         locate_host(CC->cs_host, &addr);
 450                 }
 451                 else {
 452                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 453                         CC->cs_host[24] = 0;
 454                 }
 455         }
 456
 457         lprintf(7, "client %d/%d/%01d.%02d (%s)\n",
 458                 dev_code,
 459                 cli_code,
 460                 (rev_level / 100),
 461                 (rev_level % 100),
 462                 desc);
 463
 464         syslog(LOG_NOTICE,"session %d: client %d/%d/%01d.%02d (%s) from %s\n",
 465                 CC->cs_pid,
 466                 dev_code,
 467                 cli_code,
 468                 (rev_level / 100),
 469                 (rev_level % 100),
 470                 desc,
 471                 CC->cs_host);
 472         cprintf("%d Ok\n",OK);
 473 }
 474
 475
 476 /*
 477  * display system messages or help
 478  */
 479 void cmd_mesg(char *mname)
 480 {
 481         FILE *mfp;
 482         char targ[256];
 483         char buf[256];
 484         char *dirs[2];
 485
 486         extract(buf,mname,0);
 487
 488
 489         dirs[0]=mallok(64);
 490         dirs[1]=mallok(64);
 491         strcpy(dirs[0],"messages");
 492         strcpy(dirs[1],"help");
 493         mesg_locate(targ,buf,2,dirs);
 494         phree(dirs[0]);
 495         phree(dirs[1]);
 496
 497
 498         if (strlen(targ)==0) {
 499                 cprintf("%d '%s' not found.\n",ERROR,mname);
 500                 return;
 501                 }
 502
 503         mfp = fopen(targ,"r");
 504         if (mfp==NULL) {
 505                 cprintf("%d Cannot open '%s': %s\n",
 506                         ERROR,targ,strerror(errno));
 507                 return;
 508                 }
 509         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
 510
 511         while (fgets(buf,255,mfp)!=NULL) {
 512                 buf[strlen(buf)-1] = 0;
 513                 do_help_subst(buf);
 514                 cprintf("%s\n",buf);
 515                 }
 516
 517         fclose(mfp);
 518         cprintf("000\n");
 519         }
 520
 521
 522 /*
 523  * enter system messages or help
 524  */
 525 void cmd_emsg(char *mname)
 526 {
 527         FILE *mfp;
 528         char targ[256];
 529         char buf[256];
 530         char *dirs[2];
 531         int a;
 532
 533         if (CtdlAccessCheck(ac_aide)) return;
 534
 535         extract(buf,mname,0);
 536         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 537                 if (buf[a] == '/') buf[a] = '.';
 538                 }
 539
 540         dirs[0]=mallok(64);
 541         dirs[1]=mallok(64);
 542         strcpy(dirs[0],"messages");
 543         strcpy(dirs[1],"help");
 544         mesg_locate(targ,buf,2,dirs);
 545         phree(dirs[0]);
 546         phree(dirs[1]);
 547
 548         if (strlen(targ)==0) {
 549                 snprintf(targ, sizeof targ, "./help/%s", buf);
 550                 }
 551
 552         mfp = fopen(targ,"w");
 553         if (mfp==NULL) {
 554                 cprintf("%d Cannot open '%s': %s\n",
 555                         ERROR,targ,strerror(errno));
 556                 return;
 557                 }
 558         cprintf("%d %s\n", SEND_LISTING, targ);
 559
 560         while (client_gets(buf), strcmp(buf, "000")) {
 561                 fprintf(mfp, "%s\n", buf);
 562                 }
 563
 564         fclose(mfp);
 565         }
 566
 567
 568 /* Don't show the names of private rooms unless the viewing
 569  * user also knows the rooms.
 570  */
 571 void GenerateRoomDisplay(char *real_room,
 572                         struct CitContext *viewed,
 573                         struct CitContext *viewer) {
 574
 575         strcpy(real_room, viewed->quickroom.QRname);
 576         if (viewed->quickroom.QRflags & QR_MAILBOX) {
 577                 strcpy(real_room, &real_room[11]);
 578         }
 579         if (viewed->quickroom.QRflags & QR_PRIVATE) {
 580                 if ( (CtdlRoomAccess(&viewed->quickroom, &viewer->usersupp)
 581                    & UA_KNOWN) == 0) {
 582                         strcpy(real_room, "<private room>");
 583                 }
 584         }
 585
 586         if (viewed->cs_flags & CS_CHAT) {
 587                 while (strlen(real_room) < 14)
 588                         strcat(real_room, " ");
 589
 590                 strcpy(&real_room[14], "<chat>");
 591         }
 592
 593 }
 594
 595 /*
 596  * Convenience function.
 597  */
 598 int CtdlAccessCheck(int required_level) {
 599
 600         if (CC->internal_pgm) return(0);
 601         if (required_level >= ac_internal) {
 602                 cprintf("%d This is not a user-level command.\n",
 603                         ERROR+HIGHER_ACCESS_REQUIRED);
 604                 return(-1);
 605         }
 606
 607         if (CC->usersupp.axlevel >= 6) return(0);
 608         if (required_level >= ac_aide) {
 609                 cprintf("%d This command requires Aide access.\n",
 610                         ERROR+HIGHER_ACCESS_REQUIRED);
 611                 return(-1);
 612         }
 613
 614         if (is_room_aide()) return(0);
 615         if (required_level >= ac_room_aide) {
 616                 cprintf("%d This command requires Aide or Room Aide access.\n",
 617                         ERROR + HIGHER_ACCESS_REQUIRED);
 618                 return(-1);
 619         }
 620
 621         if (CC->logged_in) return(0);
 622         if (required_level >= ac_logged_in) {
 623                 cprintf("%d Not logged in.\n", ERROR+NOT_LOGGED_IN);
 624                 return(-1);
 625         }
 626
 627         /* shhh ... succeed quietly */
 628         return(0);
 629 }
 630
 631
 632
 633 /*
 634  * Terminate another running session
 635  */
 636 void cmd_term(char *cmdbuf)
 637 {
 638         int session_num;
 639         struct CitContext *ccptr;
 640         int found_it = 0;
 641
 642         if (CtdlAccessCheck(ac_aide)) return;
 643
 644         session_num = extract_int(cmdbuf, 0);
 645         if (session_num == CC->cs_pid) {
 646                 cprintf("%d You can't kill your own session.\n", ERROR);
 647                 return;
 648                 }
 649
 650         lprintf(9, "Locating session to kill\n");
 651         begin_critical_section(S_SESSION_TABLE);
 652         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 653                 if (session_num == ccptr->cs_pid) {
 654                         ccptr->kill_me = 1;
 655                         found_it = 1;
 656                         }
 657                 }
 658         end_critical_section(S_SESSION_TABLE);
 659
 660         if (found_it) {
 661                 cprintf("%d Session terminated.\n", OK);
 662                 }
 663         else {
 664                 cprintf("%d No such session.\n", ERROR);
 665                 }
 666         }
 667
 668
 669
 670
 671
 672 /*
 673  * get the paginator prompt
 674  */
 675 void cmd_more(void) {
 676         cprintf("%d %s\n",OK,config.c_moreprompt);
 677         }
 678
 679 /*
 680  * echo
 681  */
 682 void cmd_echo(char *etext)
 683 {
 684         cprintf("%d %s\n",OK,etext);
 685         }
 686
 687
 688
 689 /*
 690  * identify as internal program
 691  */
 692 void cmd_ipgm(char *argbuf)
 693 {
 694         int secret;
 695
 696         secret = extract_int(argbuf, 0);
 697         if (secret == config.c_ipgm_secret) {
 698                 CC->internal_pgm = 1;
 699                 strcpy(CC->curr_user, "<internal program>");
 700                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 701                 cprintf("%d Authenticated as an internal program.\n",OK);
 702                 }
 703         else {
 704                 cprintf("%d Authentication failed.\n",ERROR);
 705                 lprintf(3, "Warning: ipgm authentication failed.\n");
 706                 }
 707         }
 708
 709
 710 /*
 711  * Shut down the server
 712  */
 713 void cmd_down(void) {
 714
 715         if (CtdlAccessCheck(ac_aide)) return;
 716
 717         cprintf("%d Shutting down server.  Goodbye.\n", OK);
 718         master_cleanup();
 719         }
 720
 721 /*
 722  * Schedule or cancel a server shutdown
 723  */
 724 void cmd_scdn(char *argbuf)
 725 {
 726         int new_state;
 727
 728         if (CtdlAccessCheck(ac_aide)) return;
 729
 730         new_state = extract_int(argbuf, 0);
 731         if ((new_state == 0) || (new_state == 1)) {
 732                 ScheduledShutdown = new_state;
 733                 }
 734         cprintf("%d %d\n", OK, ScheduledShutdown);
 735         }
 736
 737
 738 /*
 739  * Generate a "nonce" for APOP-style authentication.
 740  *
 741  * RFC 1725 et al specify a PID to be placed in front of the nonce.
 742  * Quoth BTX: That would be stupid.
 743  */
 744 void generate_nonce(struct CitContext *con) {
 745         struct timeval tv;
 746
 747         memset(con->cs_nonce, NONCE_SIZE, 0);
 748         gettimeofday(&tv, NULL);
 749         memset(con->cs_nonce, NONCE_SIZE, 0);
 750         snprintf(con->cs_nonce, NONCE_SIZE, "<%d%ld@%s>",
 751                 rand(), tv.tv_usec, config.c_fqdn);
 752 }
 753
 754
 755
 756
 757 /*
 758  * Back-end function for starting a session
 759  */
 760 void begin_session(struct CitContext *con)
 761 {
 762         int len;
 763         struct sockaddr_in sin;
 764
 765         /*
 766          * Initialize some variables specific to our context.
 767          */
 768         con->logged_in = 0;
 769         con->internal_pgm = 0;
 770         con->download_fp = NULL;
 771         con->upload_fp = NULL;
 772         con->FirstExpressMessage = NULL;
 773         time(&con->lastcmd);
 774         time(&con->lastidle);
 775         strcpy(con->lastcmdname, "    ");
 776         strcpy(con->cs_clientname, "(unknown)");
 777         strcpy(con->curr_user, NLI);
 778         strcpy(con->net_node,"");
 779         strcpy(con->fake_username, "");
 780         strcpy(con->fake_postname, "");
 781         strcpy(con->fake_hostname, "");
 782         strcpy(con->fake_roomname, "");
 783         generate_nonce(con);
 784         snprintf(con->temp, sizeof con->temp, tmpnam(NULL));
 785         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 786         con->cs_host[sizeof con->cs_host - 1] = 0;
 787         len = sizeof sin;
 788         if (!CC->is_local_socket) {
 789                 if (!getpeername(con->client_socket,
 790                    (struct sockaddr *) &sin, &len))
 791                         locate_host(con->cs_host, &sin.sin_addr);
 792         }
 793         else {
 794                 strcpy(con->cs_host, "");
 795         }
 796         con->cs_flags = 0;
 797         con->upload_type = UPL_FILE;
 798         con->dl_is_net = 0;
 799         con->FirstSessData = NULL;
 800
 801         con->nologin = 0;
 802         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 803                 con->nologin = 1;
 804
 805         lprintf(3, "citserver[%3d]: started.\n", con->cs_pid);
 806
 807         /* Run any session startup routines registered by loadable modules */
 808         PerformSessionHooks(EVT_START);
 809
 810         rec_log(CL_CONNECT, "");
 811 }
 812
 813
 814 void citproto_begin_session() {
 815         if (CC->nologin==1) {
 816                 cprintf("%d %s: Too many users are already online "
 817                         "(maximum is %d)\n",
 818                         ERROR+MAX_SESSIONS_EXCEEDED,
 819                         config.c_nodename, config.c_maxsessions);
 820                 }
 821         else {
 822                 cprintf("%d %s Citadel/UX server ready.\n",
 823                         OK, config.c_nodename);
 824                 }
 825 }
 826
 827
 828
 829
 830 /*
 831  * This loop recognizes all server commands.
 832  */
 833 void do_command_loop(void) {
 834         char cmdbuf[256];
 835
 836         time(&CC->lastcmd);
 837         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 838         if (client_gets(cmdbuf) < 1) {
 839                 lprintf(3, "Client socket is broken.  Ending session.\n");
 840                 CC->kill_me = 1;
 841                 return;
 842         }
 843         lprintf(5, "citserver[%3d]: %s\n", CC->cs_pid, cmdbuf);
 844
 845         /*
 846          * Let other clients see the last command we executed, and
 847          * update the idle time, but not NOOP, PEXP, or GEXP.
 848          */
 849         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 850            && (strncasecmp(cmdbuf, "PEXP", 4))
 851            && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
 852                 strcpy(CC->lastcmdname, "    ");
 853                 safestrncpy(CC->lastcmdname, cmdbuf,
 854                         sizeof(CC->lastcmdname) );
 855                 time(&CC->lastidle);
 856                 }
 857
 858         if ((strncasecmp(cmdbuf, "ENT0", 4))
 859            && (strncasecmp(cmdbuf, "MESG", 4))
 860            && (strncasecmp(cmdbuf, "MSGS", 4)))
 861         {
 862            CC->cs_flags &= ~CS_POSTING;
 863         }
 864
 865         if (!strncasecmp(cmdbuf,"NOOP",4)) {
 866                 cprintf("%d%cok\n",OK,CtdlCheckExpress());
 867                 }
 868
 869         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 870                 cprintf("%d Goodbye.\n",OK);
 871                 CC->kill_me = 1;
 872                 }
 873
 874         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 875                 if (CC->logged_in) logout(CC);
 876                 cprintf("%d logged out.\n",OK);
 877                 }
 878
 879         else if (!strncasecmp(cmdbuf,"USER",4)) {
 880                 cmd_user(&cmdbuf[5]);
 881                 }
 882
 883         else if (!strncasecmp(cmdbuf,"PASS",4)) {
 884                 cmd_pass(&cmdbuf[5]);
 885                 }
 886
 887         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 888                 cmd_newu(&cmdbuf[5]);
 889                 }
 890
 891         else if (!strncasecmp(cmdbuf,"SETP",4)) {
 892                 cmd_setp(&cmdbuf[5]);
 893                 }
 894
 895         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 896                 cmd_lrms(&cmdbuf[5]);
 897                 }
 898
 899         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
 900                 cmd_lkra(&cmdbuf[5]);
 901                 }
 902
 903         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
 904                 cmd_lkrn(&cmdbuf[5]);
 905                 }
 906
 907         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
 908                 cmd_lkro(&cmdbuf[5]);
 909                 }
 910
 911         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
 912                 cmd_lzrm(&cmdbuf[5]);
 913                 }
 914
 915         else if (!strncasecmp(cmdbuf,"GETU",4)) {
 916                 cmd_getu();
 917                 }
 918
 919         else if (!strncasecmp(cmdbuf,"SETU",4)) {
 920                 cmd_setu(&cmdbuf[5]);
 921                 }
 922
 923         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
 924                 cmd_goto(&cmdbuf[5]);
 925                 }
 926
 927         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
 928                 cmd_msgs(&cmdbuf[5]);
 929                 }
 930
 931         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
 932                 cmd_whok();
 933                 }
 934
 935         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
 936                 cmd_rdir();
 937                 }
 938
 939         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
 940                 cmd_msg0(&cmdbuf[5]);
 941                 }
 942
 943         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
 944                 cmd_msg2(&cmdbuf[5]);
 945                 }
 946
 947         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
 948                 cmd_msg3(&cmdbuf[5]);
 949                 }
 950
 951         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
 952                 cmd_msg4(&cmdbuf[5]);
 953                 }
 954
 955         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
 956                 cmd_opna(&cmdbuf[5]);
 957                 }
 958
 959         else if (!strncasecmp(cmdbuf,"INFO",4)) {
 960                 cmd_info();
 961                 }
 962
 963         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
 964                 cmd_slrp(&cmdbuf[5]);
 965                 }
 966
 967         else if (!strncasecmp(cmdbuf,"INVT",4)) {
 968                 cmd_invt_kick(&cmdbuf[5],1);
 969                 }
 970
 971         else if (!strncasecmp(cmdbuf,"KICK",4)) {
 972                 cmd_invt_kick(&cmdbuf[5],0);
 973                 }
 974
 975         else if (!strncasecmp(cmdbuf,"GETR",4)) {
 976                 cmd_getr();
 977                 }
 978
 979         else if (!strncasecmp(cmdbuf,"SETR",4)) {
 980                 cmd_setr(&cmdbuf[5]);
 981                 }
 982
 983         else if (!strncasecmp(cmdbuf,"GETA",4)) {
 984                 cmd_geta();
 985                 }
 986
 987         else if (!strncasecmp(cmdbuf,"SETA",4)) {
 988                 cmd_seta(&cmdbuf[5]);
 989                 }
 990
 991         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
 992                 cmd_ent0(&cmdbuf[5]);
 993                 }
 994
 995         else if (!strncasecmp(cmdbuf,"ENT3",4)) {
 996                 cmd_ent3(&cmdbuf[5]);
 997                 }
 998
 999         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1000                 cmd_rinf();
1001                 }
1002
1003         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1004                 cmd_dele(&cmdbuf[5]);
1005                 }
1006
1007         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1008                 cmd_kill(&cmdbuf[5]);
1009                 }
1010
1011         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1012                 cmd_cre8(&cmdbuf[5]);
1013                 }
1014
1015         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1016                 cmd_move(&cmdbuf[5]);
1017                 }
1018
1019         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1020                 cmd_forg();
1021                 }
1022
1023         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1024                 cmd_mesg(&cmdbuf[5]);
1025                 }
1026
1027         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1028                 cmd_emsg(&cmdbuf[5]);
1029                 }
1030
1031         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1032                 cmd_gnur();
1033                 }
1034
1035         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1036                 cmd_vali(&cmdbuf[5]);
1037                 }
1038
1039         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1040                 cmd_einf(&cmdbuf[5]);
1041                 }
1042
1043         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1044                 cmd_list();
1045                 }
1046
1047         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1048                 cmd_chek();
1049                 }
1050
1051         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1052                 cmd_delf(&cmdbuf[5]);
1053                 }
1054
1055         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1056                 cmd_movf(&cmdbuf[5]);
1057                 }
1058
1059         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1060                 cmd_netf(&cmdbuf[5]);
1061                 }
1062
1063         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1064                 cmd_open(&cmdbuf[5]);
1065                 }
1066
1067         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1068                 cmd_clos();
1069                 }
1070
1071         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1072                 cmd_uopn(&cmdbuf[5]);
1073                 }
1074
1075         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1076                 cmd_ucls(&cmdbuf[5]);
1077                 }
1078
1079         else if (!strncasecmp(cmdbuf,"READ",4)) {
1080                 cmd_read(&cmdbuf[5]);
1081                 }
1082
1083         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1084                 cmd_writ(&cmdbuf[5]);
1085                 }
1086
1087         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1088                 cmd_qusr(&cmdbuf[5]);
1089                 }
1090
1091         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1092                 cmd_echo(&cmdbuf[5]);
1093                 }
1094
1095         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1096                 cmd_oimg(&cmdbuf[5]);
1097                 }
1098
1099         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1100                 cmd_more();
1101                 }
1102
1103         else if (!strncasecmp(cmdbuf,"NETP",4)) {
1104                 cmd_netp(&cmdbuf[5]);
1105                 }
1106
1107         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1108                 cmd_ndop(&cmdbuf[5]);
1109                 }
1110
1111         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1112                 cmd_nuop(&cmdbuf[5]);
1113                 }
1114
1115         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1116                 cmd_lflr();
1117                 }
1118
1119         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1120                 cmd_cflr(&cmdbuf[5]);
1121                 }
1122
1123         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1124                 cmd_kflr(&cmdbuf[5]);
1125                 }
1126
1127         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1128                 cmd_eflr(&cmdbuf[5]);
1129                 }
1130
1131         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1132                 cmd_iden(&cmdbuf[5]);
1133                 }
1134
1135         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1136                 cmd_ipgm(&cmdbuf[5]);
1137                 }
1138
1139         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1140                 cmd_term(&cmdbuf[5]);
1141                 }
1142
1143         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1144                 cmd_down();
1145                 }
1146
1147         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1148                 cmd_scdn(&cmdbuf[5]);
1149                 }
1150
1151         else if (!strncasecmp(cmdbuf, "NSET", 4)) {
1152                 cmd_nset(&cmdbuf[5]);
1153                 }
1154
1155         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1156                 cmd_uimg(&cmdbuf[5]);
1157                 }
1158
1159         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1160                 cmd_time();
1161                 }
1162
1163         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1164                 cmd_agup(&cmdbuf[5]);
1165                 }
1166
1167         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1168                 cmd_asup(&cmdbuf[5]);
1169                 }
1170
1171         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1172                 cmd_gpex(&cmdbuf[5]);
1173                 }
1174
1175         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1176                 cmd_spex(&cmdbuf[5]);
1177                 }
1178
1179         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1180                 cmd_conf(&cmdbuf[5]);
1181                 }
1182
1183 #ifdef DEBUG_MEMORY_LEAKS
1184         else if (!strncasecmp(cmdbuf, "LEAK", 4)) {
1185                 dump_tracked();
1186                 }
1187 #endif
1188
1189         else if (!DLoader_Exec_Cmd(cmdbuf))
1190                 {
1191                    cprintf("%d Unrecognized or unsupported command.\n",
1192                             ERROR);
1193                 }
1194
1195         /* Run any after-each-command outines registered by modules */
1196         PerformSessionHooks(EVT_CMD);
1197 }