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