citadel/citserver.c

   1 /*
   2  * $Id$
   3  *
   4  * Main source module for the Citadel server
   5  *
   6  */
   7
   8 #ifdef DLL_EXPORT
   9 #define IN_LIBCIT
  10 #endif
  11
  12 #include "sysdep.h"
  13 #include <stdlib.h>
  14 #include <unistd.h>
  15 #include <stdio.h>
  16 #include <fcntl.h>
  17 #include <signal.h>
  18
  19 #if TIME_WITH_SYS_TIME
  20 # include <sys/time.h>
  21 # include <time.h>
  22 #else
  23 # if HAVE_SYS_TIME_H
  24 #  include <sys/time.h>
  25 # else
  26 #  include <time.h>
  27 # endif
  28 #endif
  29
  30 #include <ctype.h>
  31 #include <string.h>
  32 #include <errno.h>
  33 #include <limits.h>
  34 #include <syslog.h>
  35 /* #include <dlfcn.h> */
  36 #include <netdb.h>
  37 #include <sys/types.h>
  38 #include <sys/socket.h>
  39 #include <netinet/in.h>
  40 #include <arpa/inet.h>
  41 #include "citadel.h"
  42 #include "server.h"
  43 #include "dynloader.h"
  44 #include "sysdep_decls.h"
  45 #include "citserver.h"
  46 #include "config.h"
  47 #include "database.h"
  48 #include "housekeeping.h"
  49 #include "user_ops.h"
  50 #include "logging.h"
  51 #include "msgbase.h"
  52 #include "support.h"
  53 #include "locate_host.h"
  54 #include "room_ops.h"
  55 #include "file_ops.h"
  56 #include "policy.h"
  57 #include "control.h"
  58 #include "tools.h"
  59
  60 #ifndef HAVE_SNPRINTF
  61 #include "snprintf.h"
  62 #endif
  63
  64 struct CitContext *ContextList = NULL;
  65 char *unique_session_numbers;
  66 int ScheduledShutdown = 0;
  67 int do_defrag = 0;
  68
  69 extern long int timezone;
  70 extern int daylight;
  71
  72 /*
  73  * Various things that need to be initialized at startup
  74  */
  75 void master_startup(void) {
  76         struct timeval tv;
  77
  78         lprintf(9, "master_startup() started\n");
  79         lprintf(7, "Opening databases\n");
  80         open_databases();
  81
  82         if (do_defrag) {
  83                 defrag_databases();
  84         }
  85
  86         check_ref_counts();
  87
  88         lprintf(7, "Creating base rooms (if necessary)\n");
  89         create_room(BASEROOM,           0, "", 0, 1);
  90         create_room(AIDEROOM,           3, "", 0, 1);
  91         create_room(SYSCONFIGROOM,      3, "", 0, 1);
  92         create_room(config.c_twitroom,  0, "", 0, 1);
  93
  94         lprintf(7, "Seeding the pseudo-random number generator...\n");
  95         gettimeofday(&tv, NULL);
  96         srand(tv.tv_usec);
  97         lprintf(9, "master_startup() finished\n");
  98 }
  99
 100
 101
 102 /*
 103  * Cleanup routine to be called when the server is shutting down.
 104  * WARNING: It's no longer safe to call this function to force a shutdown.
 105  * Instead, set time_to_die = 1.
 106  */
 107 void master_cleanup(void) {
 108         struct CleanupFunctionHook *fcn;
 109
 110         /* Run any cleanup routines registered by loadable modules */
 111         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
 112                 (*fcn->h_function_pointer)();
 113         }
 114
 115         /* Close databases */
 116         lprintf(7, "Closing databases\n");
 117         close_databases();
 118
 119         /* Do system-dependent stuff */
 120         sysdep_master_cleanup();
 121
 122         /* Now go away. */
 123         lprintf(3, "citserver: exiting.\n");
 124         fflush(stdout); fflush(stderr);
 125         exit(0);
 126 }
 127
 128
 129 /*
 130  * Free any per-session data allocated by modules or whatever
 131  */
 132 void deallocate_user_data(struct CitContext *con)
 133 {
 134         struct CtdlSessData *ptr;
 135
 136         begin_critical_section(S_SESSION_TABLE);
 137         while (con->FirstSessData != NULL) {
 138                 lprintf(9, "Deallocating user data symbol %ld\n",
 139                         con->FirstSessData->sym_id);
 140                 if (con->FirstSessData->sym_data != NULL)
 141                         phree(con->FirstSessData->sym_data);
 142                 ptr = con->FirstSessData->next;
 143                 phree(con->FirstSessData);
 144                 con->FirstSessData = ptr;
 145         }
 146         end_critical_section(S_SESSION_TABLE);
 147 }
 148
 149
 150
 151
 152 /*
 153  * Terminate a session and remove its context data structure.
 154  */
 155 void RemoveContext (struct CitContext *con)
 156 {
 157         struct CitContext *ptr = NULL;
 158         struct CitContext *ToFree = NULL;
 159
 160         lprintf(9, "RemoveContext() called\n");
 161         if (con==NULL) {
 162                 lprintf(5, "WARNING: RemoveContext() called with NULL!\n");
 163                 return;
 164                 }
 165
 166         /* Remove the context from the global context list.  This needs
 167          * to get done FIRST to avoid concurrency problems.  It is *vitally*
 168          * important to keep num_sessions accurate!!
 169          */
 170         lprintf(7, "Removing context for session %d\n", con->cs_pid);
 171         begin_critical_section(S_SESSION_TABLE);
 172         if (ContextList == con) {
 173                 ToFree = ContextList;
 174                 ContextList = ContextList->next;
 175                 --num_sessions;
 176                 }
 177         else {
 178                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
 179                         if (ptr->next == con) {
 180                                 ToFree = ptr->next;
 181                                 ptr->next = ptr->next->next;
 182                                 --num_sessions;
 183                                 }
 184                         }
 185                 }
 186         end_critical_section(S_SESSION_TABLE);
 187
 188         if (ToFree == NULL) {
 189                 lprintf(9, "RemoveContext() found nothing to remove\n");
 190                 return;
 191         }
 192
 193         /* Run any cleanup routines registered by loadable modules.
 194          * Note 1: This must occur *before* deallocate_user_data() because the
 195          *         cleanup functions might touch dynamic session data.
 196          * Note 2: We have to "become_session()" because the cleanup functions
 197          *         might make references to "CC" assuming it's the right one.
 198          */
 199         become_session(con);
 200         PerformSessionHooks(EVT_STOP);
 201         become_session(NULL);
 202
 203         /* Now handle all of the administrivia. */
 204         lprintf(7, "Calling logout(%d)\n", con->cs_pid);
 205         logout(con);
 206
 207         rec_log(CL_TERMINATE, con->curr_user);
 208         unlink(con->temp);
 209         lprintf(3, "[%3d] Session ended.\n", con->cs_pid);
 210
 211
 212         syslog(LOG_NOTICE,"session %d: ended", con->cs_pid);
 213
 214         /* Deallocate any user-data attached to this session */
 215         deallocate_user_data(con);
 216
 217         /* If the client is still connected, blow 'em away. */
 218         lprintf(7, "Closing socket %d\n", con->client_socket);
 219         close(con->client_socket);
 220
 221         /* This is where we used to check for scheduled shutdowns. */
 222
 223         /* Free up the memory used by this context */
 224         phree(con);
 225
 226         lprintf(7, "Done with RemoveContext()\n");
 227 }
 228
 229
 230
 231 /*
 232  * Get a dynamic symbol number for per-session user data.
 233  * This API call should be made only ONCE per symbol per citserver run.
 234  */
 235 int CtdlGetDynamicSymbol()
 236 {
 237         static unsigned int next_symbol = SYM_MAX;
 238         return ++next_symbol;
 239 }
 240
 241
 242
 243 /*
 244  * Return a pointer to some generic per-session user data.
 245  * (This function returns NULL if the requested symbol is not allocated.)
 246  *
 247  * NOTE: we use critical sections for allocating and de-allocating these,
 248  *       but not for locating one.
 249  */
 250 void *CtdlGetUserData(unsigned long requested_sym)
 251 {
 252         struct CtdlSessData *ptr;
 253
 254         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)
 255                 if (ptr->sym_id == requested_sym)
 256                         return(ptr->sym_data);
 257
 258         lprintf(2, "ERROR! CtdlGetUserData(%ld) symbol not allocated\n",
 259                 requested_sym);
 260         return NULL;
 261 }
 262
 263
 264 /*
 265  * Allocate some generic per-session user data.
 266  */
 267 void CtdlAllocUserData(unsigned long requested_sym, size_t num_bytes)
 268 {
 269         struct CtdlSessData *ptr;
 270
 271         lprintf(9, "CtdlAllocUserData(%ld) called\n", requested_sym);
 272
 273         /* Fail silently if the symbol is already registered. */
 274         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 275                 if (ptr->sym_id == requested_sym) {
 276                         return;
 277                 }
 278         }
 279
 280         /* Grab us some memory!  Dem's good eatin' !!  */
 281         ptr = mallok(sizeof(struct CtdlSessData));
 282         ptr->sym_id = requested_sym;
 283         ptr->sym_data = mallok(num_bytes);
 284         memset(ptr->sym_data, 0, num_bytes);
 285
 286         begin_critical_section(S_SESSION_TABLE);
 287         ptr->next = CC->FirstSessData;
 288         CC->FirstSessData = ptr;
 289         end_critical_section(S_SESSION_TABLE);
 290
 291         lprintf(9, "CtdlAllocUserData(%ld) finished\n", requested_sym);
 292 }
 293
 294
 295 /*
 296  * Change the size of a buffer allocated with CtdlAllocUserData()
 297  */
 298 void CtdlReallocUserData(unsigned long requested_sym, size_t num_bytes)
 299 {
 300         struct CtdlSessData *ptr;
 301
 302         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 303                 if (ptr->sym_id == requested_sym) {
 304                         ptr->sym_data = reallok(ptr->sym_data, num_bytes);
 305                         return;
 306                 }
 307         }
 308
 309         lprintf(2, "CtdlReallocUserData() ERROR: symbol %ld not found!\n",
 310                 requested_sym);
 311 }
 312
 313
 314
 315
 316
 317
 318 /*
 319  * cmd_info()  -  tell the client about this server
 320  */
 321 void cmd_info(void) {
 322         cprintf("%d Server info:\n", LISTING_FOLLOWS);
 323         cprintf("%d\n", CC->cs_pid);
 324         cprintf("%s\n", config.c_nodename);
 325         cprintf("%s\n", config.c_humannode);
 326         cprintf("%s\n", config.c_fqdn);
 327         cprintf("%s\n", CITADEL);
 328         cprintf("%d\n", REV_LEVEL);
 329         cprintf("%s\n", config.c_bbs_city);
 330         cprintf("%s\n", config.c_sysadm);
 331         cprintf("%d\n", SERVER_TYPE);
 332         cprintf("%s\n", config.c_moreprompt);
 333         cprintf("1\n"); /* 1 = yes, this system supports floors */
 334         cprintf("1\n"); /* 1 = we support the extended paging options */
 335         cprintf("%s\n", CC->cs_nonce);
 336         cprintf("000\n");
 337 }
 338
 339
 340 /*
 341  * returns an asterisk if there are any express messages waiting,
 342  * space otherwise.
 343  */
 344 char CtdlCheckExpress(void) {
 345         if (CC->FirstExpressMessage == NULL) {
 346                 return(' ');
 347                 }
 348         else {
 349                 return('*');
 350                 }
 351         }
 352
 353 void cmd_time(void)
 354 {
 355    time_t tv;
 356
 357    tv = time(NULL);
 358    localtime(&tv);
 359
 360    cprintf("%d %ld|%ld|%d\n", OK, (long)tv, timezone, daylight);
 361 }
 362
 363 /*
 364  * Check whether two hostnames match.
 365  * "Realname" should be an actual name of a client that is trying to connect;
 366  * "testname" should be the value we are comparing it with. The idea is that we
 367  * want to compare with both the abbreviated and fully-qualified versions of
 368  * "testname;" some people define "localhost" as "localhost.foo.com," etc.
 369  */
 370 static int hostnames_match(const char *realname, const char *testname) {
 371         struct hostent *he;
 372         int retval = 0;
 373
 374         if (!strcasecmp(realname, testname))
 375                 return 1;
 376
 377 #ifdef HAVE_NONREENTRANT_NETDB
 378         begin_critical_section(S_NETDB);
 379 #endif
 380
 381         if ((he = gethostbyname(testname)) != NULL)
 382                 if (!strcasecmp(realname, he->h_name))
 383                         retval = 1;
 384
 385 #ifdef HAVE_NONREENTRANT_NETDB
 386         end_critical_section(S_NETDB);
 387 #endif
 388
 389         return retval;
 390         }
 391
 392 /*
 393  * check a hostname against the public_clients file
 394  */
 395 int is_public_client(char *where)
 396 {
 397         char buf[SIZ];
 398         FILE *fp;
 399
 400         lprintf(9, "Checking whether %s is a public client\n", where);
 401
 402         if (hostnames_match(where, "localhost")) return(1);
 403         if (hostnames_match(where, config.c_fqdn)) return(1);
 404
 405         fp = fopen("public_clients","r");
 406         if (fp == NULL) return(0);
 407
 408         while (fgets(buf, sizeof buf, fp)!=NULL) {
 409                 while (isspace((buf[strlen(buf)-1])))
 410                         buf[strlen(buf)-1] = 0;
 411                 if (hostnames_match(where,buf)) {
 412                         fclose(fp);
 413                         return(1);
 414                         }
 415                 }
 416
 417         fclose(fp);
 418         return(0);
 419         }
 420
 421
 422 /*
 423  * the client is identifying itself to the server
 424  */
 425 void cmd_iden(char *argbuf)
 426 {
 427         int dev_code;
 428         int cli_code;
 429         int rev_level;
 430         char desc[SIZ];
 431         char from_host[SIZ];
 432         struct in_addr addr;
 433         int do_lookup = 0;
 434
 435         if (num_parms(argbuf)<4) {
 436                 cprintf("%d usage error\n",ERROR);
 437                 return;
 438         }
 439
 440         dev_code = extract_int(argbuf,0);
 441         cli_code = extract_int(argbuf,1);
 442         rev_level = extract_int(argbuf,2);
 443         extract(desc,argbuf,3);
 444
 445         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 446         from_host[sizeof from_host - 1] = 0;
 447         if (num_parms(argbuf)>=5) extract(from_host,argbuf,4);
 448
 449         CC->cs_clientdev = dev_code;
 450         CC->cs_clienttyp = cli_code;
 451         CC->cs_clientver = rev_level;
 452         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 453         CC->cs_clientname[31] = 0;
 454
 455         if (strlen(from_host) > 0) {
 456                 if (CC->is_local_socket) do_lookup = 1;
 457                 else if (is_public_client(CC->cs_host)) do_lookup = 1;
 458         }
 459
 460         if (do_lookup) {
 461                 lprintf(9, "Looking up hostname '%s'\n", from_host);
 462                 if ((addr.s_addr = inet_addr(from_host)) != -1) {
 463                         locate_host(CC->cs_host, &addr);
 464                 }
 465                 else {
 466                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 467                         CC->cs_host[sizeof CC->cs_host - 1] = 0;
 468                 }
 469         }
 470
 471         lprintf(7, "client %d/%d/%01d.%02d (%s)\n",
 472                 dev_code,
 473                 cli_code,
 474                 (rev_level / 100),
 475                 (rev_level % 100),
 476                 desc);
 477
 478         syslog(LOG_NOTICE,"session %d: client %d/%d/%01d.%02d (%s) from %s\n",
 479                 CC->cs_pid,
 480                 dev_code,
 481                 cli_code,
 482                 (rev_level / 100),
 483                 (rev_level % 100),
 484                 desc,
 485                 CC->cs_host);
 486         cprintf("%d Ok\n",OK);
 487 }
 488
 489
 490 /*
 491  * display system messages or help
 492  */
 493 void cmd_mesg(char *mname)
 494 {
 495         FILE *mfp;
 496         char targ[SIZ];
 497         char buf[SIZ];
 498         char *dirs[2];
 499
 500         extract(buf,mname,0);
 501
 502
 503         dirs[0]=mallok(64);
 504         dirs[1]=mallok(64);
 505         strcpy(dirs[0],"messages");
 506         strcpy(dirs[1],"help");
 507         mesg_locate(targ,buf,2,dirs);
 508         phree(dirs[0]);
 509         phree(dirs[1]);
 510
 511
 512         if (strlen(targ)==0) {
 513                 cprintf("%d '%s' not found.\n",ERROR,mname);
 514                 return;
 515                 }
 516
 517         mfp = fopen(targ,"r");
 518         if (mfp==NULL) {
 519                 cprintf("%d Cannot open '%s': %s\n",
 520                         ERROR,targ,strerror(errno));
 521                 return;
 522                 }
 523         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
 524
 525         while (fgets(buf, (SIZ-1), mfp)!=NULL) {
 526                 buf[strlen(buf)-1] = 0;
 527                 do_help_subst(buf);
 528                 cprintf("%s\n",buf);
 529                 }
 530
 531         fclose(mfp);
 532         cprintf("000\n");
 533         }
 534
 535
 536 /*
 537  * enter system messages or help
 538  */
 539 void cmd_emsg(char *mname)
 540 {
 541         FILE *mfp;
 542         char targ[SIZ];
 543         char buf[SIZ];
 544         char *dirs[2];
 545         int a;
 546
 547         if (CtdlAccessCheck(ac_aide)) return;
 548
 549         extract(buf,mname,0);
 550         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 551                 if (buf[a] == '/') buf[a] = '.';
 552                 }
 553
 554         dirs[0]=mallok(64);
 555         dirs[1]=mallok(64);
 556         strcpy(dirs[0],"messages");
 557         strcpy(dirs[1],"help");
 558         mesg_locate(targ,buf,2,dirs);
 559         phree(dirs[0]);
 560         phree(dirs[1]);
 561
 562         if (strlen(targ)==0) {
 563                 snprintf(targ, sizeof targ, "./help/%s", buf);
 564                 }
 565
 566         mfp = fopen(targ,"w");
 567         if (mfp==NULL) {
 568                 cprintf("%d Cannot open '%s': %s\n",
 569                         ERROR,targ,strerror(errno));
 570                 return;
 571                 }
 572         cprintf("%d %s\n", SEND_LISTING, targ);
 573
 574         while (client_gets(buf), strcmp(buf, "000")) {
 575                 fprintf(mfp, "%s\n", buf);
 576                 }
 577
 578         fclose(mfp);
 579         }
 580
 581
 582 /* Don't show the names of private rooms unless the viewing
 583  * user also knows the rooms.
 584  */
 585 void GenerateRoomDisplay(char *real_room,
 586                         struct CitContext *viewed,
 587                         struct CitContext *viewer) {
 588
 589         strcpy(real_room, viewed->quickroom.QRname);
 590         if (viewed->quickroom.QRflags & QR_MAILBOX) {
 591                 strcpy(real_room, &real_room[11]);
 592         }
 593         if (viewed->quickroom.QRflags & QR_PRIVATE) {
 594                 if ( (CtdlRoomAccess(&viewed->quickroom, &viewer->usersupp)
 595                    & UA_KNOWN) == 0) {
 596                         strcpy(real_room, "<private room>");
 597                 }
 598         }
 599
 600         if (viewed->cs_flags & CS_CHAT) {
 601                 while (strlen(real_room) < 14)
 602                         strcat(real_room, " ");
 603
 604                 strcpy(&real_room[14], "<chat>");
 605         }
 606
 607 }
 608
 609 /*
 610  * Convenience function.
 611  */
 612 int CtdlAccessCheck(int required_level) {
 613
 614         if (CC->internal_pgm) return(0);
 615         if (required_level >= ac_internal) {
 616                 cprintf("%d This is not a user-level command.\n",
 617                         ERROR+HIGHER_ACCESS_REQUIRED);
 618                 return(-1);
 619         }
 620
 621         if (CC->usersupp.axlevel >= 6) return(0);
 622         if (required_level >= ac_aide) {
 623                 cprintf("%d This command requires Aide access.\n",
 624                         ERROR+HIGHER_ACCESS_REQUIRED);
 625                 return(-1);
 626         }
 627
 628         if (is_room_aide()) return(0);
 629         if (required_level >= ac_room_aide) {
 630                 cprintf("%d This command requires Aide or Room Aide access.\n",
 631                         ERROR + HIGHER_ACCESS_REQUIRED);
 632                 return(-1);
 633         }
 634
 635         if (CC->logged_in) return(0);
 636         if (required_level >= ac_logged_in) {
 637                 cprintf("%d Not logged in.\n", ERROR+NOT_LOGGED_IN);
 638                 return(-1);
 639         }
 640
 641         /* shhh ... succeed quietly */
 642         return(0);
 643 }
 644
 645
 646
 647 /*
 648  * Terminate another running session
 649  */
 650 void cmd_term(char *cmdbuf)
 651 {
 652         int session_num;
 653         struct CitContext *ccptr;
 654         int found_it = 0;
 655         int allowed = 0;
 656
 657         session_num = extract_int(cmdbuf, 0);
 658         if (session_num == CC->cs_pid) {
 659                 cprintf("%d You can't kill your own session.\n", ERROR);
 660                 return;
 661         }
 662
 663         lprintf(9, "Locating session to kill\n");
 664         begin_critical_section(S_SESSION_TABLE);
 665         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 666                 if (session_num == ccptr->cs_pid) {
 667                         found_it = 1;
 668                         if ((ccptr->usersupp.usernum == CC->usersupp.usernum)
 669                            || (CC->usersupp.axlevel >= 6)) {
 670                                 allowed = 1;
 671                                 ccptr->kill_me = 1;
 672                         }
 673                         else {
 674                                 allowed = 0;
 675                         }
 676                 }
 677         }
 678         end_critical_section(S_SESSION_TABLE);
 679
 680         if (found_it) {
 681                 if (allowed) {
 682                         cprintf("%d Session terminated.\n", OK);
 683                 }
 684                 else {
 685                         cprintf("%d You are not allowed to do that.\n",
 686                                 ERROR + HIGHER_ACCESS_REQUIRED);
 687                 }
 688         }
 689         else {
 690                 cprintf("%d No such session.\n", ERROR);
 691         }
 692 }
 693
 694
 695
 696
 697
 698 /*
 699  * get the paginator prompt
 700  */
 701 void cmd_more(void) {
 702         cprintf("%d %s\n",OK,config.c_moreprompt);
 703         }
 704
 705 /*
 706  * echo
 707  */
 708 void cmd_echo(char *etext)
 709 {
 710         cprintf("%d %s\n",OK,etext);
 711         }
 712
 713
 714
 715 /*
 716  * identify as internal program
 717  */
 718 void cmd_ipgm(char *argbuf)
 719 {
 720         int secret;
 721
 722         secret = extract_int(argbuf, 0);
 723         if (secret == config.c_ipgm_secret) {
 724                 CC->internal_pgm = 1;
 725                 strcpy(CC->curr_user, "<internal program>");
 726                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 727                 cprintf("%d Authenticated as an internal program.\n",OK);
 728                 }
 729         else {
 730                 cprintf("%d Authentication failed.\n",ERROR);
 731                 lprintf(3, "Warning: ipgm authentication failed.\n");
 732                 }
 733         }
 734
 735
 736 /*
 737  * Shut down the server
 738  */
 739 void cmd_down(void) {
 740
 741         if (CtdlAccessCheck(ac_aide)) return;
 742
 743         cprintf("%d Shutting down server.  Goodbye.\n", OK);
 744         time_to_die = 1;
 745         }
 746
 747 /*
 748  * Schedule or cancel a server shutdown
 749  */
 750 void cmd_scdn(char *argbuf)
 751 {
 752         int new_state;
 753
 754         if (CtdlAccessCheck(ac_aide)) return;
 755
 756         new_state = extract_int(argbuf, 0);
 757         if ((new_state == 0) || (new_state == 1)) {
 758                 ScheduledShutdown = new_state;
 759                 }
 760         cprintf("%d %d\n", OK, ScheduledShutdown);
 761 }
 762
 763
 764 /*
 765  * Set or unset asynchronous protocol mode
 766  */
 767 void cmd_asyn(char *argbuf)
 768 {
 769         int new_state;
 770
 771         new_state = extract_int(argbuf, 0);
 772         if ((new_state == 0) || (new_state == 1)) {
 773                 CC->is_async = new_state;
 774         }
 775         cprintf("%d %d\n", OK, CC->is_async);
 776 }
 777
 778
 779 /*
 780  * Generate a "nonce" for APOP-style authentication.
 781  *
 782  * RFC 1725 et al specify a PID to be placed in front of the nonce.
 783  * Quoth BTX: That would be stupid.
 784  */
 785 void generate_nonce(struct CitContext *con) {
 786         struct timeval tv;
 787
 788         memset(con->cs_nonce, NONCE_SIZE, 0);
 789         gettimeofday(&tv, NULL);
 790         memset(con->cs_nonce, NONCE_SIZE, 0);
 791         snprintf(con->cs_nonce, NONCE_SIZE, "<%d%ld@%s>",
 792                 rand(), (long)tv.tv_usec, config.c_fqdn);
 793 }
 794
 795
 796
 797
 798 /*
 799  * Back-end function for starting a session
 800  */
 801 void begin_session(struct CitContext *con)
 802 {
 803         int len;
 804         struct sockaddr_in sin;
 805
 806         /*
 807          * Initialize some variables specific to our context.
 808          */
 809         con->logged_in = 0;
 810         con->internal_pgm = 0;
 811         con->download_fp = NULL;
 812         con->upload_fp = NULL;
 813         con->FirstExpressMessage = NULL;
 814         time(&con->lastcmd);
 815         time(&con->lastidle);
 816         strcpy(con->lastcmdname, "    ");
 817         strcpy(con->cs_clientname, "(unknown)");
 818         strcpy(con->curr_user, NLI);
 819         strcpy(con->net_node,"");
 820         strcpy(con->fake_username, "");
 821         strcpy(con->fake_postname, "");
 822         strcpy(con->fake_hostname, "");
 823         strcpy(con->fake_roomname, "");
 824         generate_nonce(con);
 825         snprintf(con->temp, sizeof con->temp, tmpnam(NULL));
 826         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 827         con->cs_host[sizeof con->cs_host - 1] = 0;
 828         len = sizeof sin;
 829         if (!CC->is_local_socket) {
 830                 if (!getpeername(con->client_socket,
 831                    (struct sockaddr *) &sin, &len))
 832                         locate_host(con->cs_host, &sin.sin_addr);
 833         }
 834         else {
 835                 strcpy(con->cs_host, "");
 836         }
 837         con->cs_flags = 0;
 838         con->upload_type = UPL_FILE;
 839         con->dl_is_net = 0;
 840         con->FirstSessData = NULL;
 841
 842         con->nologin = 0;
 843         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 844                 con->nologin = 1;
 845
 846         lprintf(3, "Session started.\n");
 847
 848         /* Run any session startup routines registered by loadable modules */
 849         PerformSessionHooks(EVT_START);
 850
 851         rec_log(CL_CONNECT, "");
 852 }
 853
 854
 855 void citproto_begin_session() {
 856         if (CC->nologin==1) {
 857                 cprintf("%d %s: Too many users are already online "
 858                         "(maximum is %d)\n",
 859                         ERROR+MAX_SESSIONS_EXCEEDED,
 860                         config.c_nodename, config.c_maxsessions);
 861                 }
 862         else {
 863                 cprintf("%d %s Citadel/UX server ready.\n",
 864                         OK, config.c_nodename);
 865                 }
 866 }
 867
 868
 869
 870
 871 /*
 872  * This loop recognizes all server commands.
 873  */
 874 void do_command_loop(void) {
 875         char cmdbuf[SIZ];
 876
 877         time(&CC->lastcmd);
 878         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 879         if (client_gets(cmdbuf) < 1) {
 880                 lprintf(3, "Client socket is broken.  Ending session.\n");
 881                 CC->kill_me = 1;
 882                 return;
 883         }
 884         lprintf(5, "Citadel: %s\n", cmdbuf);
 885
 886         /*
 887          * Let other clients see the last command we executed, and
 888          * update the idle time, but not NOOP, PEXP, or GEXP.
 889          */
 890         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 891            && (strncasecmp(cmdbuf, "PEXP", 4))
 892            && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
 893                 strcpy(CC->lastcmdname, "    ");
 894                 safestrncpy(CC->lastcmdname, cmdbuf,
 895                         sizeof(CC->lastcmdname) );
 896                 time(&CC->lastidle);
 897                 }
 898
 899         if ((strncasecmp(cmdbuf, "ENT0", 4))
 900            && (strncasecmp(cmdbuf, "MESG", 4))
 901            && (strncasecmp(cmdbuf, "MSGS", 4)))
 902         {
 903            CC->cs_flags &= ~CS_POSTING;
 904         }
 905
 906         if (!strncasecmp(cmdbuf,"NOOP",4)) {
 907                 cprintf("%d%cok\n",OK,CtdlCheckExpress());
 908                 }
 909
 910         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 911                 cprintf("%d Goodbye.\n",OK);
 912                 CC->kill_me = 1;
 913                 }
 914
 915         else if (!strncasecmp(cmdbuf,"ASYN",4)) {
 916                 cmd_asyn(&cmdbuf[5]);
 917                 }
 918
 919         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 920                 if (CC->logged_in) logout(CC);
 921                 cprintf("%d logged out.\n",OK);
 922                 }
 923
 924         else if (!strncasecmp(cmdbuf,"USER",4)) {
 925                 cmd_user(&cmdbuf[5]);
 926                 }
 927
 928         else if (!strncasecmp(cmdbuf,"PASS",4)) {
 929                 cmd_pass(&cmdbuf[5]);
 930                 }
 931
 932         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 933                 cmd_newu(&cmdbuf[5]);
 934                 }
 935
 936         else if (!strncasecmp(cmdbuf,"CREU",4)) {
 937                 cmd_creu(&cmdbuf[5]);
 938                 }
 939
 940         else if (!strncasecmp(cmdbuf,"SETP",4)) {
 941                 cmd_setp(&cmdbuf[5]);
 942                 }
 943
 944         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 945                 cmd_lrms(&cmdbuf[5]);
 946                 }
 947
 948         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
 949                 cmd_lkra(&cmdbuf[5]);
 950                 }
 951
 952         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
 953                 cmd_lkrn(&cmdbuf[5]);
 954                 }
 955
 956         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
 957                 cmd_lkro(&cmdbuf[5]);
 958                 }
 959
 960         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
 961                 cmd_lzrm(&cmdbuf[5]);
 962                 }
 963
 964         else if (!strncasecmp(cmdbuf,"GETU",4)) {
 965                 cmd_getu();
 966                 }
 967
 968         else if (!strncasecmp(cmdbuf,"SETU",4)) {
 969                 cmd_setu(&cmdbuf[5]);
 970                 }
 971
 972         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
 973                 cmd_goto(&cmdbuf[5]);
 974                 }
 975
 976         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
 977                 cmd_msgs(&cmdbuf[5]);
 978                 }
 979
 980         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
 981                 cmd_whok();
 982                 }
 983
 984         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
 985                 cmd_rdir();
 986                 }
 987
 988         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
 989                 cmd_msg0(&cmdbuf[5]);
 990                 }
 991
 992         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
 993                 cmd_msg2(&cmdbuf[5]);
 994                 }
 995
 996         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
 997                 cmd_msg3(&cmdbuf[5]);
 998                 }
 999
1000         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
1001                 cmd_msg4(&cmdbuf[5]);
1002                 }
1003
1004         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
1005                 cmd_opna(&cmdbuf[5]);
1006                 }
1007
1008         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1009                 cmd_info();
1010                 }
1011
1012         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1013                 cmd_slrp(&cmdbuf[5]);
1014                 }
1015
1016         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1017                 cmd_invt_kick(&cmdbuf[5],1);
1018                 }
1019
1020         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1021                 cmd_invt_kick(&cmdbuf[5],0);
1022                 }
1023
1024         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1025                 cmd_getr();
1026                 }
1027
1028         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1029                 cmd_setr(&cmdbuf[5]);
1030                 }
1031
1032         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1033                 cmd_geta();
1034                 }
1035
1036         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1037                 cmd_seta(&cmdbuf[5]);
1038                 }
1039
1040         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1041                 cmd_ent0(&cmdbuf[5]);
1042                 }
1043
1044         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1045                 cmd_rinf();
1046                 }
1047
1048         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1049                 cmd_dele(&cmdbuf[5]);
1050                 }
1051
1052         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1053                 cmd_kill(&cmdbuf[5]);
1054                 }
1055
1056         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1057                 cmd_cre8(&cmdbuf[5]);
1058                 }
1059
1060         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1061                 cmd_move(&cmdbuf[5]);
1062                 }
1063
1064         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1065                 cmd_forg();
1066                 }
1067
1068         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1069                 cmd_mesg(&cmdbuf[5]);
1070                 }
1071
1072         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1073                 cmd_emsg(&cmdbuf[5]);
1074                 }
1075
1076         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1077                 cmd_gnur();
1078                 }
1079
1080         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1081                 cmd_vali(&cmdbuf[5]);
1082                 }
1083
1084         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1085                 cmd_einf(&cmdbuf[5]);
1086                 }
1087
1088         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1089                 cmd_list();
1090                 }
1091
1092         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1093                 cmd_chek();
1094                 }
1095
1096         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1097                 cmd_delf(&cmdbuf[5]);
1098                 }
1099
1100         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1101                 cmd_movf(&cmdbuf[5]);
1102                 }
1103
1104         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1105                 cmd_netf(&cmdbuf[5]);
1106                 }
1107
1108         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1109                 cmd_open(&cmdbuf[5]);
1110                 }
1111
1112         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1113                 cmd_clos();
1114                 }
1115
1116         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1117                 cmd_uopn(&cmdbuf[5]);
1118                 }
1119
1120         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1121                 cmd_ucls(&cmdbuf[5]);
1122                 }
1123
1124         else if (!strncasecmp(cmdbuf,"READ",4)) {
1125                 cmd_read(&cmdbuf[5]);
1126                 }
1127
1128         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1129                 cmd_writ(&cmdbuf[5]);
1130                 }
1131
1132         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1133                 cmd_qusr(&cmdbuf[5]);
1134                 }
1135
1136         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1137                 cmd_echo(&cmdbuf[5]);
1138                 }
1139
1140         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1141                 cmd_oimg(&cmdbuf[5]);
1142                 }
1143
1144         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1145                 cmd_more();
1146                 }
1147
1148         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1149                 cmd_ndop(&cmdbuf[5]);
1150                 }
1151
1152         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1153                 cmd_nuop(&cmdbuf[5]);
1154                 }
1155
1156         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1157                 cmd_lflr();
1158                 }
1159
1160         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1161                 cmd_cflr(&cmdbuf[5]);
1162                 }
1163
1164         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1165                 cmd_kflr(&cmdbuf[5]);
1166                 }
1167
1168         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1169                 cmd_eflr(&cmdbuf[5]);
1170                 }
1171
1172         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1173                 cmd_iden(&cmdbuf[5]);
1174                 }
1175
1176         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1177                 cmd_ipgm(&cmdbuf[5]);
1178                 }
1179
1180         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1181                 cmd_term(&cmdbuf[5]);
1182                 }
1183
1184         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1185                 cmd_down();
1186                 }
1187
1188         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1189                 cmd_scdn(&cmdbuf[5]);
1190                 }
1191
1192         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1193                 cmd_uimg(&cmdbuf[5]);
1194                 }
1195
1196         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1197                 cmd_time();
1198                 }
1199
1200         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1201                 cmd_agup(&cmdbuf[5]);
1202                 }
1203
1204         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1205                 cmd_asup(&cmdbuf[5]);
1206                 }
1207
1208         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1209                 cmd_gpex(&cmdbuf[5]);
1210                 }
1211
1212         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1213                 cmd_spex(&cmdbuf[5]);
1214                 }
1215
1216         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1217                 cmd_conf(&cmdbuf[5]);
1218                 }
1219
1220         else if (!strncasecmp(cmdbuf, "SEEN", 4)) {
1221                 cmd_seen(&cmdbuf[5]);
1222                 }
1223
1224 #ifdef DEBUG_MEMORY_LEAKS
1225         else if (!strncasecmp(cmdbuf, "LEAK", 4)) {
1226                 dump_tracked();
1227                 }
1228 #endif
1229
1230         else if (!DLoader_Exec_Cmd(cmdbuf))
1231                 {
1232                    cprintf("%d Unrecognized or unsupported command.\n",
1233                             ERROR);
1234                 }
1235
1236         /* Run any after-each-command outines registered by modules */
1237         PerformSessionHooks(EVT_CMD);
1238 }