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
  61         if (do_defrag) {
  62                 defrag_databases();
  63         }
  64
  65         check_ref_counts();
  66
  67         lprintf(7, "Creating base rooms (if necessary)\n");
  68         create_room(BASEROOM,           0, "", 0);
  69         create_room(AIDEROOM,           3, "", 0);
  70         create_room(SYSCONFIGROOM,      3, "", 0);
  71         create_room(config.c_twitroom,  0, "", 0);
  72
  73         lprintf(7, "Seeding the pseudo-random number generator...\n");
  74         gettimeofday(&tv, NULL);
  75         srand(tv.tv_usec);
  76         lprintf(9, "master_startup() finished\n");
  77 }
  78
  79
  80
  81 /*
  82  * Cleanup routine to be called when the server is shutting down.
  83  */
  84 void master_cleanup(void) {
  85         struct CleanupFunctionHook *fcn;
  86
  87         /* Cancel all running sessions */
  88         lprintf(7, "Cancelling running sessions...\n");
  89
  90 /* FIXME do something here
  91         while (ContextList != NULL) {
  92                 }
  93  */
  94
  95         /* Run any cleanup routines registered by loadable modules */
  96         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
  97                 (*fcn->h_function_pointer)();
  98         }
  99
 100         /* Close databases */
 101         lprintf(7, "Closing databases\n");
 102         close_databases();
 103
 104         /* Do system-dependent stuff */
 105         sysdep_master_cleanup();
 106
 107         /* Now go away. */
 108         lprintf(3, "citserver: exiting.\n");
 109         fflush(stdout); fflush(stderr);
 110         exit(0);
 111 }
 112
 113
 114 /*
 115  * Free any per-session data allocated by modules or whatever
 116  */
 117 void deallocate_user_data(struct CitContext *con)
 118 {
 119         struct CtdlSessData *ptr;
 120
 121         begin_critical_section(S_SESSION_TABLE);
 122         while (con->FirstSessData != NULL) {
 123                 lprintf(9, "Deallocating user data symbol %ld\n",
 124                         con->FirstSessData->sym_id);
 125                 if (con->FirstSessData->sym_data != NULL)
 126                         phree(con->FirstSessData->sym_data);
 127                 ptr = con->FirstSessData->next;
 128                 phree(con->FirstSessData);
 129                 con->FirstSessData = ptr;
 130         }
 131         end_critical_section(S_SESSION_TABLE);
 132 }
 133
 134
 135
 136
 137 /*
 138  * Terminate a session and remove its context data structure.
 139  */
 140 void RemoveContext (struct CitContext *con)
 141 {
 142         struct CitContext *ptr = NULL;
 143         struct CitContext *ToFree = NULL;
 144
 145         lprintf(9, "RemoveContext() called\n");
 146         if (con==NULL) {
 147                 lprintf(5, "WARNING: RemoveContext() called with NULL!\n");
 148                 return;
 149                 }
 150
 151         /* Remove the context from the global context list.  This needs
 152          * to get done FIRST to avoid concurrency problems.  It is *vitally*
 153          * important to keep num_sessions accurate!!
 154          */
 155         lprintf(7, "Removing context for session %d\n", con->cs_pid);
 156         begin_critical_section(S_SESSION_TABLE);
 157         if (ContextList == con) {
 158                 ToFree = ContextList;
 159                 ContextList = ContextList->next;
 160                 --num_sessions;
 161                 }
 162         else {
 163                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
 164                         if (ptr->next == con) {
 165                                 ToFree = ptr->next;
 166                                 ptr->next = ptr->next->next;
 167                                 --num_sessions;
 168                                 }
 169                         }
 170                 }
 171         end_critical_section(S_SESSION_TABLE);
 172
 173         if (ToFree == NULL) {
 174                 lprintf(9, "RemoveContext() found nothing to remove\n");
 175                 return;
 176         }
 177
 178         /* Run any cleanup routines registered by loadable modules.
 179          * Note 1: This must occur *before* deallocate_user_data() because the
 180          *         cleanup functions might touch dynamic session data.
 181          * Note 2: We have to "become_session()" because the cleanup functions
 182          *         might make references to "CC" assuming it's the right one.
 183          */
 184         become_session(con);
 185         PerformSessionHooks(EVT_STOP);
 186         become_session(NULL);
 187
 188         /* Now handle all of the administrivia. */
 189         lprintf(7, "Calling logout(%d)\n", con->cs_pid);
 190         logout(con);
 191
 192         rec_log(CL_TERMINATE, con->curr_user);
 193         unlink(con->temp);
 194         lprintf(3, "citserver[%3d]: ended.\n", con->cs_pid);
 195
 196
 197         syslog(LOG_NOTICE,"session %d: ended", con->cs_pid);
 198
 199         /* Deallocate any user-data attached to this session */
 200         deallocate_user_data(con);
 201
 202         /* If the client is still connected, blow 'em away. */
 203         lprintf(7, "Closing socket %d\n", con->client_socket);
 204         close(con->client_socket);
 205
 206         /* This is where we used to check for scheduled shutdowns. */
 207
 208         /* Free up the memory used by this context */
 209         phree(con);
 210
 211         lprintf(7, "Done with RemoveContext()\n");
 212 }
 213
 214
 215
 216 /*
 217  * Get a dynamic symbol number for per-session user data.
 218  * This API call should be made only ONCE per symbol per citserver run.
 219  */
 220 int CtdlGetDynamicSymbol()
 221 {
 222         static unsigned int next_symbol = SYM_MAX;
 223         return ++next_symbol;
 224 }
 225
 226
 227
 228 /*
 229  * Return a pointer to some generic per-session user data.
 230  * (This function returns NULL if the requested symbol is not allocated.)
 231  *
 232  * NOTE: we use critical sections for allocating and de-allocating these,
 233  *       but not for locating one.
 234  */
 235 void *CtdlGetUserData(unsigned long requested_sym)
 236 {
 237         struct CtdlSessData *ptr;
 238
 239         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)
 240                 if (ptr->sym_id == requested_sym)
 241                         return(ptr->sym_data);
 242
 243         lprintf(2, "ERROR! CtdlGetUserData(%ld) symbol not allocated\n",
 244                 requested_sym);
 245         return NULL;
 246 }
 247
 248
 249 /*
 250  * Allocate some generic per-session user data.
 251  */
 252 void CtdlAllocUserData(unsigned long requested_sym, size_t num_bytes)
 253 {
 254         struct CtdlSessData *ptr;
 255
 256         lprintf(9, "CtdlAllocUserData(%ld) called\n", requested_sym);
 257
 258         /* Fail silently if the symbol is already registered. */
 259         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 260                 if (ptr->sym_id == requested_sym) {
 261                         return;
 262                 }
 263         }
 264
 265         /* Grab us some memory!  Dem's good eatin' !!  */
 266         ptr = mallok(sizeof(struct CtdlSessData));
 267         ptr->sym_id = requested_sym;
 268         ptr->sym_data = mallok(num_bytes);
 269         memset(ptr->sym_data, 0, num_bytes);
 270
 271         begin_critical_section(S_SESSION_TABLE);
 272         ptr->next = CC->FirstSessData;
 273         CC->FirstSessData = ptr;
 274         end_critical_section(S_SESSION_TABLE);
 275
 276         lprintf(9, "CtdlAllocUserData(%ld) finished\n", requested_sym);
 277 }
 278
 279
 280 /*
 281  * Change the size of a buffer allocated with CtdlAllocUserData()
 282  */
 283 void CtdlReallocUserData(unsigned long requested_sym, size_t num_bytes)
 284 {
 285         struct CtdlSessData *ptr;
 286
 287         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 288                 if (ptr->sym_id == requested_sym) {
 289                         ptr->sym_data = reallok(ptr->sym_data, num_bytes);
 290                         return;
 291                 }
 292         }
 293
 294         lprintf(2, "CtdlReallocUserData() ERROR: symbol %ld not found!\n",
 295                 requested_sym);
 296 }
 297
 298
 299
 300
 301
 302
 303 /*
 304  * cmd_info()  -  tell the client about this server
 305  */
 306 void cmd_info(void) {
 307         cprintf("%d Server info:\n", LISTING_FOLLOWS);
 308         cprintf("%d\n", CC->cs_pid);
 309         cprintf("%s\n", config.c_nodename);
 310         cprintf("%s\n", config.c_humannode);
 311         cprintf("%s\n", config.c_fqdn);
 312         cprintf("%s\n", CITADEL);
 313         cprintf("%d\n", REV_LEVEL);
 314         cprintf("%s\n", config.c_bbs_city);
 315         cprintf("%s\n", config.c_sysadm);
 316         cprintf("%d\n", SERVER_TYPE);
 317         cprintf("%s\n", config.c_moreprompt);
 318         cprintf("1\n"); /* 1 = yes, this system supports floors */
 319         cprintf("1\n"); /* 1 = we support the extended paging options */
 320         cprintf("%s\n", CC->cs_nonce);
 321         cprintf("000\n");
 322 }
 323
 324
 325 /*
 326  * returns an asterisk if there are any express messages waiting,
 327  * space otherwise.
 328  */
 329 char CtdlCheckExpress(void) {
 330         if (CC->FirstExpressMessage == NULL) {
 331                 return(' ');
 332                 }
 333         else {
 334                 return('*');
 335                 }
 336         }
 337
 338 void cmd_time(void)
 339 {
 340    time_t tv;
 341
 342    tv = time(NULL);
 343
 344    cprintf("%d %ld\n", OK, tv);
 345 }
 346
 347 /*
 348  * Check whether two hostnames match.
 349  * "Realname" should be an actual name of a client that is trying to connect;
 350  * "testname" should be the value we are comparing it with. The idea is that we
 351  * want to compare with both the abbreviated and fully-qualified versions of
 352  * "testname;" some people define "localhost" as "localhost.foo.com," etc.
 353  */
 354 static int hostnames_match(const char *realname, const char *testname) {
 355         struct hostent *he;
 356         int retval = 0;
 357
 358         if (!strcasecmp(realname, testname))
 359                 return 1;
 360
 361 #ifdef HAVE_NONREENTRANT_NETDB
 362         begin_critical_section(S_NETDB);
 363 #endif
 364
 365         if ((he = gethostbyname(testname)) != NULL)
 366                 if (!strcasecmp(realname, he->h_name))
 367                         retval = 1;
 368
 369 #ifdef HAVE_NONREENTRANT_NETDB
 370         end_critical_section(S_NETDB);
 371 #endif
 372
 373         return retval;
 374         }
 375
 376 /*
 377  * check a hostname against the public_clients file
 378  */
 379 int is_public_client(char *where)
 380 {
 381         char buf[SIZ];
 382         FILE *fp;
 383
 384         lprintf(9, "Checking whether %s is a public client\n", where);
 385
 386         if (hostnames_match(where, "localhost")) return(1);
 387         if (hostnames_match(where, config.c_fqdn)) return(1);
 388
 389         fp = fopen("public_clients","r");
 390         if (fp == NULL) return(0);
 391
 392         while (fgets(buf, sizeof buf, fp)!=NULL) {
 393                 while (isspace((buf[strlen(buf)-1])))
 394                         buf[strlen(buf)-1] = 0;
 395                 if (hostnames_match(where,buf)) {
 396                         fclose(fp);
 397                         return(1);
 398                         }
 399                 }
 400
 401         fclose(fp);
 402         return(0);
 403         }
 404
 405
 406 /*
 407  * the client is identifying itself to the server
 408  */
 409 void cmd_iden(char *argbuf)
 410 {
 411         int dev_code;
 412         int cli_code;
 413         int rev_level;
 414         char desc[SIZ];
 415         char from_host[SIZ];
 416         struct in_addr addr;
 417         int do_lookup = 0;
 418
 419         if (num_parms(argbuf)<4) {
 420                 cprintf("%d usage error\n",ERROR);
 421                 return;
 422         }
 423
 424         dev_code = extract_int(argbuf,0);
 425         cli_code = extract_int(argbuf,1);
 426         rev_level = extract_int(argbuf,2);
 427         extract(desc,argbuf,3);
 428
 429         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 430         from_host[sizeof from_host - 1] = 0;
 431         if (num_parms(argbuf)>=5) extract(from_host,argbuf,4);
 432
 433         CC->cs_clientdev = dev_code;
 434         CC->cs_clienttyp = cli_code;
 435         CC->cs_clientver = rev_level;
 436         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 437         CC->cs_clientname[31] = 0;
 438
 439         if (strlen(from_host) > 0) {
 440                 if (CC->is_local_socket) do_lookup = 1;
 441                 else if (is_public_client(CC->cs_host)) do_lookup = 1;
 442         }
 443
 444         if (do_lookup) {
 445                 lprintf(9, "Looking up hostname '%s'\n", from_host);
 446                 if ((addr.s_addr = inet_addr(from_host)) != -1) {
 447                         locate_host(CC->cs_host, &addr);
 448                 }
 449                 else {
 450                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 451                         CC->cs_host[24] = 0;
 452                 }
 453         }
 454
 455         lprintf(7, "client %d/%d/%01d.%02d (%s)\n",
 456                 dev_code,
 457                 cli_code,
 458                 (rev_level / 100),
 459                 (rev_level % 100),
 460                 desc);
 461
 462         syslog(LOG_NOTICE,"session %d: client %d/%d/%01d.%02d (%s) from %s\n",
 463                 CC->cs_pid,
 464                 dev_code,
 465                 cli_code,
 466                 (rev_level / 100),
 467                 (rev_level % 100),
 468                 desc,
 469                 CC->cs_host);
 470         cprintf("%d Ok\n",OK);
 471 }
 472
 473
 474 /*
 475  * display system messages or help
 476  */
 477 void cmd_mesg(char *mname)
 478 {
 479         FILE *mfp;
 480         char targ[SIZ];
 481         char buf[SIZ];
 482         char *dirs[2];
 483
 484         extract(buf,mname,0);
 485
 486
 487         dirs[0]=mallok(64);
 488         dirs[1]=mallok(64);
 489         strcpy(dirs[0],"messages");
 490         strcpy(dirs[1],"help");
 491         mesg_locate(targ,buf,2,dirs);
 492         phree(dirs[0]);
 493         phree(dirs[1]);
 494
 495
 496         if (strlen(targ)==0) {
 497                 cprintf("%d '%s' not found.\n",ERROR,mname);
 498                 return;
 499                 }
 500
 501         mfp = fopen(targ,"r");
 502         if (mfp==NULL) {
 503                 cprintf("%d Cannot open '%s': %s\n",
 504                         ERROR,targ,strerror(errno));
 505                 return;
 506                 }
 507         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
 508
 509         while (fgets(buf, (SIZ-1), mfp)!=NULL) {
 510                 buf[strlen(buf)-1] = 0;
 511                 do_help_subst(buf);
 512                 cprintf("%s\n",buf);
 513                 }
 514
 515         fclose(mfp);
 516         cprintf("000\n");
 517         }
 518
 519
 520 /*
 521  * enter system messages or help
 522  */
 523 void cmd_emsg(char *mname)
 524 {
 525         FILE *mfp;
 526         char targ[SIZ];
 527         char buf[SIZ];
 528         char *dirs[2];
 529         int a;
 530
 531         if (CtdlAccessCheck(ac_aide)) return;
 532
 533         extract(buf,mname,0);
 534         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 535                 if (buf[a] == '/') buf[a] = '.';
 536                 }
 537
 538         dirs[0]=mallok(64);
 539         dirs[1]=mallok(64);
 540         strcpy(dirs[0],"messages");
 541         strcpy(dirs[1],"help");
 542         mesg_locate(targ,buf,2,dirs);
 543         phree(dirs[0]);
 544         phree(dirs[1]);
 545
 546         if (strlen(targ)==0) {
 547                 snprintf(targ, sizeof targ, "./help/%s", buf);
 548                 }
 549
 550         mfp = fopen(targ,"w");
 551         if (mfp==NULL) {
 552                 cprintf("%d Cannot open '%s': %s\n",
 553                         ERROR,targ,strerror(errno));
 554                 return;
 555                 }
 556         cprintf("%d %s\n", SEND_LISTING, targ);
 557
 558         while (client_gets(buf), strcmp(buf, "000")) {
 559                 fprintf(mfp, "%s\n", buf);
 560                 }
 561
 562         fclose(mfp);
 563         }
 564
 565
 566 /* Don't show the names of private rooms unless the viewing
 567  * user also knows the rooms.
 568  */
 569 void GenerateRoomDisplay(char *real_room,
 570                         struct CitContext *viewed,
 571                         struct CitContext *viewer) {
 572
 573         strcpy(real_room, viewed->quickroom.QRname);
 574         if (viewed->quickroom.QRflags & QR_MAILBOX) {
 575                 strcpy(real_room, &real_room[11]);
 576         }
 577         if (viewed->quickroom.QRflags & QR_PRIVATE) {
 578                 if ( (CtdlRoomAccess(&viewed->quickroom, &viewer->usersupp)
 579                    & UA_KNOWN) == 0) {
 580                         strcpy(real_room, "<private room>");
 581                 }
 582         }
 583
 584         if (viewed->cs_flags & CS_CHAT) {
 585                 while (strlen(real_room) < 14)
 586                         strcat(real_room, " ");
 587
 588                 strcpy(&real_room[14], "<chat>");
 589         }
 590
 591 }
 592
 593 /*
 594  * Convenience function.
 595  */
 596 int CtdlAccessCheck(int required_level) {
 597
 598         if (CC->internal_pgm) return(0);
 599         if (required_level >= ac_internal) {
 600                 cprintf("%d This is not a user-level command.\n",
 601                         ERROR+HIGHER_ACCESS_REQUIRED);
 602                 return(-1);
 603         }
 604
 605         if (CC->usersupp.axlevel >= 6) return(0);
 606         if (required_level >= ac_aide) {
 607                 cprintf("%d This command requires Aide access.\n",
 608                         ERROR+HIGHER_ACCESS_REQUIRED);
 609                 return(-1);
 610         }
 611
 612         if (is_room_aide()) return(0);
 613         if (required_level >= ac_room_aide) {
 614                 cprintf("%d This command requires Aide or Room Aide access.\n",
 615                         ERROR + HIGHER_ACCESS_REQUIRED);
 616                 return(-1);
 617         }
 618
 619         if (CC->logged_in) return(0);
 620         if (required_level >= ac_logged_in) {
 621                 cprintf("%d Not logged in.\n", ERROR+NOT_LOGGED_IN);
 622                 return(-1);
 623         }
 624
 625         /* shhh ... succeed quietly */
 626         return(0);
 627 }
 628
 629
 630
 631 /*
 632  * Terminate another running session
 633  */
 634 void cmd_term(char *cmdbuf)
 635 {
 636         int session_num;
 637         struct CitContext *ccptr;
 638         int found_it = 0;
 639
 640         if (CtdlAccessCheck(ac_aide)) return;
 641
 642         session_num = extract_int(cmdbuf, 0);
 643         if (session_num == CC->cs_pid) {
 644                 cprintf("%d You can't kill your own session.\n", ERROR);
 645                 return;
 646                 }
 647
 648         lprintf(9, "Locating session to kill\n");
 649         begin_critical_section(S_SESSION_TABLE);
 650         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 651                 if (session_num == ccptr->cs_pid) {
 652                         ccptr->kill_me = 1;
 653                         found_it = 1;
 654                         }
 655                 }
 656         end_critical_section(S_SESSION_TABLE);
 657
 658         if (found_it) {
 659                 cprintf("%d Session terminated.\n", OK);
 660                 }
 661         else {
 662                 cprintf("%d No such session.\n", ERROR);
 663                 }
 664         }
 665
 666
 667
 668
 669
 670 /*
 671  * get the paginator prompt
 672  */
 673 void cmd_more(void) {
 674         cprintf("%d %s\n",OK,config.c_moreprompt);
 675         }
 676
 677 /*
 678  * echo
 679  */
 680 void cmd_echo(char *etext)
 681 {
 682         cprintf("%d %s\n",OK,etext);
 683         }
 684
 685
 686
 687 /*
 688  * identify as internal program
 689  */
 690 void cmd_ipgm(char *argbuf)
 691 {
 692         int secret;
 693
 694         secret = extract_int(argbuf, 0);
 695         if (secret == config.c_ipgm_secret) {
 696                 CC->internal_pgm = 1;
 697                 strcpy(CC->curr_user, "<internal program>");
 698                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 699                 cprintf("%d Authenticated as an internal program.\n",OK);
 700                 }
 701         else {
 702                 cprintf("%d Authentication failed.\n",ERROR);
 703                 lprintf(3, "Warning: ipgm authentication failed.\n");
 704                 }
 705         }
 706
 707
 708 /*
 709  * Shut down the server
 710  */
 711 void cmd_down(void) {
 712
 713         if (CtdlAccessCheck(ac_aide)) return;
 714
 715         cprintf("%d Shutting down server.  Goodbye.\n", OK);
 716         master_cleanup();
 717         }
 718
 719 /*
 720  * Schedule or cancel a server shutdown
 721  */
 722 void cmd_scdn(char *argbuf)
 723 {
 724         int new_state;
 725
 726         if (CtdlAccessCheck(ac_aide)) return;
 727
 728         new_state = extract_int(argbuf, 0);
 729         if ((new_state == 0) || (new_state == 1)) {
 730                 ScheduledShutdown = new_state;
 731                 }
 732         cprintf("%d %d\n", OK, ScheduledShutdown);
 733 }
 734
 735
 736 /*
 737  * Set or unset asynchronous protocol mode
 738  */
 739 void cmd_asyn(char *argbuf)
 740 {
 741         int new_state;
 742
 743         new_state = extract_int(argbuf, 0);
 744         if ((new_state == 0) || (new_state == 1)) {
 745                 CC->is_async = new_state;
 746         }
 747         cprintf("%d %d\n", OK, CC->is_async);
 748 }
 749
 750
 751 /*
 752  * Generate a "nonce" for APOP-style authentication.
 753  *
 754  * RFC 1725 et al specify a PID to be placed in front of the nonce.
 755  * Quoth BTX: That would be stupid.
 756  */
 757 void generate_nonce(struct CitContext *con) {
 758         struct timeval tv;
 759
 760         memset(con->cs_nonce, NONCE_SIZE, 0);
 761         gettimeofday(&tv, NULL);
 762         memset(con->cs_nonce, NONCE_SIZE, 0);
 763         snprintf(con->cs_nonce, NONCE_SIZE, "<%d%ld@%s>",
 764                 rand(), tv.tv_usec, config.c_fqdn);
 765 }
 766
 767
 768
 769
 770 /*
 771  * Back-end function for starting a session
 772  */
 773 void begin_session(struct CitContext *con)
 774 {
 775         int len;
 776         struct sockaddr_in sin;
 777
 778         /*
 779          * Initialize some variables specific to our context.
 780          */
 781         con->logged_in = 0;
 782         con->internal_pgm = 0;
 783         con->download_fp = NULL;
 784         con->upload_fp = NULL;
 785         con->FirstExpressMessage = NULL;
 786         time(&con->lastcmd);
 787         time(&con->lastidle);
 788         strcpy(con->lastcmdname, "    ");
 789         strcpy(con->cs_clientname, "(unknown)");
 790         strcpy(con->curr_user, NLI);
 791         strcpy(con->net_node,"");
 792         strcpy(con->fake_username, "");
 793         strcpy(con->fake_postname, "");
 794         strcpy(con->fake_hostname, "");
 795         strcpy(con->fake_roomname, "");
 796         generate_nonce(con);
 797         snprintf(con->temp, sizeof con->temp, tmpnam(NULL));
 798         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 799         con->cs_host[sizeof con->cs_host - 1] = 0;
 800         len = sizeof sin;
 801         if (!CC->is_local_socket) {
 802                 if (!getpeername(con->client_socket,
 803                    (struct sockaddr *) &sin, &len))
 804                         locate_host(con->cs_host, &sin.sin_addr);
 805         }
 806         else {
 807                 strcpy(con->cs_host, "");
 808         }
 809         con->cs_flags = 0;
 810         con->upload_type = UPL_FILE;
 811         con->dl_is_net = 0;
 812         con->FirstSessData = NULL;
 813
 814         con->nologin = 0;
 815         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 816                 con->nologin = 1;
 817
 818         lprintf(3, "citserver[%3d]: started.\n", con->cs_pid);
 819
 820         /* Run any session startup routines registered by loadable modules */
 821         PerformSessionHooks(EVT_START);
 822
 823         rec_log(CL_CONNECT, "");
 824 }
 825
 826
 827 void citproto_begin_session() {
 828         if (CC->nologin==1) {
 829                 cprintf("%d %s: Too many users are already online "
 830                         "(maximum is %d)\n",
 831                         ERROR+MAX_SESSIONS_EXCEEDED,
 832                         config.c_nodename, config.c_maxsessions);
 833                 }
 834         else {
 835                 cprintf("%d %s Citadel/UX server ready.\n",
 836                         OK, config.c_nodename);
 837                 }
 838 }
 839
 840
 841
 842
 843 /*
 844  * This loop recognizes all server commands.
 845  */
 846 void do_command_loop(void) {
 847         char cmdbuf[SIZ];
 848
 849         time(&CC->lastcmd);
 850         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 851         if (client_gets(cmdbuf) < 1) {
 852                 lprintf(3, "Client socket is broken.  Ending session.\n");
 853                 CC->kill_me = 1;
 854                 return;
 855         }
 856         lprintf(5, "citserver[%3d]: %s\n", CC->cs_pid, cmdbuf);
 857
 858         /*
 859          * Let other clients see the last command we executed, and
 860          * update the idle time, but not NOOP, PEXP, or GEXP.
 861          */
 862         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 863            && (strncasecmp(cmdbuf, "PEXP", 4))
 864            && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
 865                 strcpy(CC->lastcmdname, "    ");
 866                 safestrncpy(CC->lastcmdname, cmdbuf,
 867                         sizeof(CC->lastcmdname) );
 868                 time(&CC->lastidle);
 869                 }
 870
 871         if ((strncasecmp(cmdbuf, "ENT0", 4))
 872            && (strncasecmp(cmdbuf, "MESG", 4))
 873            && (strncasecmp(cmdbuf, "MSGS", 4)))
 874         {
 875            CC->cs_flags &= ~CS_POSTING;
 876         }
 877
 878         if (!strncasecmp(cmdbuf,"NOOP",4)) {
 879                 cprintf("%d%cok\n",OK,CtdlCheckExpress());
 880                 }
 881
 882         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 883                 cprintf("%d Goodbye.\n",OK);
 884                 CC->kill_me = 1;
 885                 }
 886
 887         else if (!strncasecmp(cmdbuf,"ASYN",4)) {
 888                 cmd_asyn(&cmdbuf[5]);
 889                 }
 890
 891         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 892                 if (CC->logged_in) logout(CC);
 893                 cprintf("%d logged out.\n",OK);
 894                 }
 895
 896         else if (!strncasecmp(cmdbuf,"USER",4)) {
 897                 cmd_user(&cmdbuf[5]);
 898                 }
 899
 900         else if (!strncasecmp(cmdbuf,"PASS",4)) {
 901                 cmd_pass(&cmdbuf[5]);
 902                 }
 903
 904         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 905                 cmd_newu(&cmdbuf[5]);
 906                 }
 907
 908         else if (!strncasecmp(cmdbuf,"SETP",4)) {
 909                 cmd_setp(&cmdbuf[5]);
 910                 }
 911
 912         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 913                 cmd_lrms(&cmdbuf[5]);
 914                 }
 915
 916         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
 917                 cmd_lkra(&cmdbuf[5]);
 918                 }
 919
 920         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
 921                 cmd_lkrn(&cmdbuf[5]);
 922                 }
 923
 924         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
 925                 cmd_lkro(&cmdbuf[5]);
 926                 }
 927
 928         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
 929                 cmd_lzrm(&cmdbuf[5]);
 930                 }
 931
 932         else if (!strncasecmp(cmdbuf,"GETU",4)) {
 933                 cmd_getu();
 934                 }
 935
 936         else if (!strncasecmp(cmdbuf,"SETU",4)) {
 937                 cmd_setu(&cmdbuf[5]);
 938                 }
 939
 940         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
 941                 cmd_goto(&cmdbuf[5]);
 942                 }
 943
 944         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
 945                 cmd_msgs(&cmdbuf[5]);
 946                 }
 947
 948         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
 949                 cmd_whok();
 950                 }
 951
 952         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
 953                 cmd_rdir();
 954                 }
 955
 956         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
 957                 cmd_msg0(&cmdbuf[5]);
 958                 }
 959
 960         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
 961                 cmd_msg2(&cmdbuf[5]);
 962                 }
 963
 964         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
 965                 cmd_msg3(&cmdbuf[5]);
 966                 }
 967
 968         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
 969                 cmd_msg4(&cmdbuf[5]);
 970                 }
 971
 972         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
 973                 cmd_opna(&cmdbuf[5]);
 974                 }
 975
 976         else if (!strncasecmp(cmdbuf,"INFO",4)) {
 977                 cmd_info();
 978                 }
 979
 980         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
 981                 cmd_slrp(&cmdbuf[5]);
 982                 }
 983
 984         else if (!strncasecmp(cmdbuf,"INVT",4)) {
 985                 cmd_invt_kick(&cmdbuf[5],1);
 986                 }
 987
 988         else if (!strncasecmp(cmdbuf,"KICK",4)) {
 989                 cmd_invt_kick(&cmdbuf[5],0);
 990                 }
 991
 992         else if (!strncasecmp(cmdbuf,"GETR",4)) {
 993                 cmd_getr();
 994                 }
 995
 996         else if (!strncasecmp(cmdbuf,"SETR",4)) {
 997                 cmd_setr(&cmdbuf[5]);
 998                 }
 999
1000         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1001                 cmd_geta();
1002                 }
1003
1004         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1005                 cmd_seta(&cmdbuf[5]);
1006                 }
1007
1008         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1009                 cmd_ent0(&cmdbuf[5]);
1010                 }
1011
1012         else if (!strncasecmp(cmdbuf,"ENT3",4)) {
1013                 cmd_ent3(&cmdbuf[5]);
1014                 }
1015
1016         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1017                 cmd_rinf();
1018                 }
1019
1020         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1021                 cmd_dele(&cmdbuf[5]);
1022                 }
1023
1024         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1025                 cmd_kill(&cmdbuf[5]);
1026                 }
1027
1028         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1029                 cmd_cre8(&cmdbuf[5]);
1030                 }
1031
1032         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1033                 cmd_move(&cmdbuf[5]);
1034                 }
1035
1036         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1037                 cmd_forg();
1038                 }
1039
1040         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1041                 cmd_mesg(&cmdbuf[5]);
1042                 }
1043
1044         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1045                 cmd_emsg(&cmdbuf[5]);
1046                 }
1047
1048         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1049                 cmd_gnur();
1050                 }
1051
1052         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1053                 cmd_vali(&cmdbuf[5]);
1054                 }
1055
1056         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1057                 cmd_einf(&cmdbuf[5]);
1058                 }
1059
1060         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1061                 cmd_list();
1062                 }
1063
1064         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1065                 cmd_chek();
1066                 }
1067
1068         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1069                 cmd_delf(&cmdbuf[5]);
1070                 }
1071
1072         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1073                 cmd_movf(&cmdbuf[5]);
1074                 }
1075
1076         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1077                 cmd_netf(&cmdbuf[5]);
1078                 }
1079
1080         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1081                 cmd_open(&cmdbuf[5]);
1082                 }
1083
1084         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1085                 cmd_clos();
1086                 }
1087
1088         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1089                 cmd_uopn(&cmdbuf[5]);
1090                 }
1091
1092         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1093                 cmd_ucls(&cmdbuf[5]);
1094                 }
1095
1096         else if (!strncasecmp(cmdbuf,"READ",4)) {
1097                 cmd_read(&cmdbuf[5]);
1098                 }
1099
1100         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1101                 cmd_writ(&cmdbuf[5]);
1102                 }
1103
1104         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1105                 cmd_qusr(&cmdbuf[5]);
1106                 }
1107
1108         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1109                 cmd_echo(&cmdbuf[5]);
1110                 }
1111
1112         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1113                 cmd_oimg(&cmdbuf[5]);
1114                 }
1115
1116         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1117                 cmd_more();
1118                 }
1119
1120         else if (!strncasecmp(cmdbuf,"NETP",4)) {
1121                 cmd_netp(&cmdbuf[5]);
1122                 }
1123
1124         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1125                 cmd_ndop(&cmdbuf[5]);
1126                 }
1127
1128         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1129                 cmd_nuop(&cmdbuf[5]);
1130                 }
1131
1132         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1133                 cmd_lflr();
1134                 }
1135
1136         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1137                 cmd_cflr(&cmdbuf[5]);
1138                 }
1139
1140         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1141                 cmd_kflr(&cmdbuf[5]);
1142                 }
1143
1144         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1145                 cmd_eflr(&cmdbuf[5]);
1146                 }
1147
1148         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1149                 cmd_iden(&cmdbuf[5]);
1150                 }
1151
1152         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1153                 cmd_ipgm(&cmdbuf[5]);
1154                 }
1155
1156         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1157                 cmd_term(&cmdbuf[5]);
1158                 }
1159
1160         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1161                 cmd_down();
1162                 }
1163
1164         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1165                 cmd_scdn(&cmdbuf[5]);
1166                 }
1167
1168         else if (!strncasecmp(cmdbuf, "NSET", 4)) {
1169                 cmd_nset(&cmdbuf[5]);
1170                 }
1171
1172         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1173                 cmd_uimg(&cmdbuf[5]);
1174                 }
1175
1176         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1177                 cmd_time();
1178                 }
1179
1180         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1181                 cmd_agup(&cmdbuf[5]);
1182                 }
1183
1184         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1185                 cmd_asup(&cmdbuf[5]);
1186                 }
1187
1188         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1189                 cmd_gpex(&cmdbuf[5]);
1190                 }
1191
1192         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1193                 cmd_spex(&cmdbuf[5]);
1194                 }
1195
1196         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1197                 cmd_conf(&cmdbuf[5]);
1198                 }
1199
1200 #ifdef DEBUG_MEMORY_LEAKS
1201         else if (!strncasecmp(cmdbuf, "LEAK", 4)) {
1202                 dump_tracked();
1203                 }
1204 #endif
1205
1206         else if (!DLoader_Exec_Cmd(cmdbuf))
1207                 {
1208                    cprintf("%d Unrecognized or unsupported command.\n",
1209                             ERROR);
1210                 }
1211
1212         /* Run any after-each-command outines registered by modules */
1213         PerformSessionHooks(EVT_CMD);
1214 }