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 /* These are commented out.  Why do we need them?  They're defined in time.h
  70  * anyway, and declaring them again here makes FreeBSD barf on it.
  71 extern long int timezone;
  72 extern int daylight;
  73  */
  74
  75 /*
  76  * Various things that need to be initialized at startup
  77  */
  78 void master_startup(void) {
  79         struct timeval tv;
  80
  81         lprintf(9, "master_startup() started\n");
  82         lprintf(7, "Opening databases\n");
  83         open_databases();
  84
  85         if (do_defrag) {
  86                 defrag_databases();
  87         }
  88
  89         check_ref_counts();
  90
  91         lprintf(7, "Creating base rooms (if necessary)\n");
  92         create_room(BASEROOM,           0, "", 0, 1);
  93         create_room(AIDEROOM,           3, "", 0, 1);
  94         create_room(SYSCONFIGROOM,      3, "", 0, 1);
  95         create_room(config.c_twitroom,  0, "", 0, 1);
  96
  97         lprintf(7, "Seeding the pseudo-random number generator...\n");
  98         gettimeofday(&tv, NULL);
  99         srand(tv.tv_usec);
 100         lprintf(9, "master_startup() finished\n");
 101 }
 102
 103
 104
 105 /*
 106  * Cleanup routine to be called when the server is shutting down.
 107  * WARNING: It's no longer safe to call this function to force a shutdown.
 108  * Instead, set time_to_die = 1.
 109  */
 110 void master_cleanup(void) {
 111         struct CleanupFunctionHook *fcn;
 112
 113         /* Run any cleanup routines registered by loadable modules */
 114         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
 115                 (*fcn->h_function_pointer)();
 116         }
 117
 118         /* Close databases */
 119         lprintf(7, "Closing databases\n");
 120         close_databases();
 121
 122         /* Do system-dependent stuff */
 123         sysdep_master_cleanup();
 124
 125         /* Now go away. */
 126         lprintf(3, "citserver: exiting.\n");
 127         fflush(stdout); fflush(stderr);
 128         exit(0);
 129 }
 130
 131
 132 /*
 133  * Free any per-session data allocated by modules or whatever
 134  */
 135 void deallocate_user_data(struct CitContext *con)
 136 {
 137         struct CtdlSessData *ptr;
 138
 139         begin_critical_section(S_SESSION_TABLE);
 140         while (con->FirstSessData != NULL) {
 141                 lprintf(9, "Deallocating user data symbol %ld\n",
 142                         con->FirstSessData->sym_id);
 143                 if (con->FirstSessData->sym_data != NULL)
 144                         phree(con->FirstSessData->sym_data);
 145                 ptr = con->FirstSessData->next;
 146                 phree(con->FirstSessData);
 147                 con->FirstSessData = ptr;
 148         }
 149         end_critical_section(S_SESSION_TABLE);
 150 }
 151
 152
 153
 154
 155 /*
 156  * Terminate a session and remove its context data structure.
 157  */
 158 void RemoveContext (struct CitContext *con)
 159 {
 160         struct CitContext *ptr = NULL;
 161         struct CitContext *ToFree = NULL;
 162
 163         lprintf(9, "RemoveContext() called\n");
 164         if (con==NULL) {
 165                 lprintf(5, "WARNING: RemoveContext() called with NULL!\n");
 166                 return;
 167                 }
 168
 169         /* Remove the context from the global context list.  This needs
 170          * to get done FIRST to avoid concurrency problems.  It is *vitally*
 171          * important to keep num_sessions accurate!!
 172          */
 173         lprintf(7, "Removing context for session %d\n", con->cs_pid);
 174         begin_critical_section(S_SESSION_TABLE);
 175         if (ContextList == con) {
 176                 ToFree = ContextList;
 177                 ContextList = ContextList->next;
 178                 --num_sessions;
 179                 }
 180         else {
 181                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
 182                         if (ptr->next == con) {
 183                                 ToFree = ptr->next;
 184                                 ptr->next = ptr->next->next;
 185                                 --num_sessions;
 186                                 }
 187                         }
 188                 }
 189         end_critical_section(S_SESSION_TABLE);
 190
 191         if (ToFree == NULL) {
 192                 lprintf(9, "RemoveContext() found nothing to remove\n");
 193                 return;
 194         }
 195
 196         /* Run any cleanup routines registered by loadable modules.
 197          * Note 1: This must occur *before* deallocate_user_data() because the
 198          *         cleanup functions might touch dynamic session data.
 199          * Note 2: We have to "become_session()" because the cleanup functions
 200          *         might make references to "CC" assuming it's the right one.
 201          */
 202         become_session(con);
 203         PerformSessionHooks(EVT_STOP);
 204         become_session(NULL);
 205
 206         /* Now handle all of the administrivia. */
 207         lprintf(7, "Calling logout(%d)\n", con->cs_pid);
 208         logout(con);
 209
 210         rec_log(CL_TERMINATE, con->curr_user);
 211         unlink(con->temp);
 212         lprintf(3, "[%3d] Session ended.\n", con->cs_pid);
 213
 214
 215         syslog(LOG_NOTICE,"session %d: ended", con->cs_pid);
 216
 217         /* Deallocate any user-data attached to this session */
 218         deallocate_user_data(con);
 219
 220         /* If the client is still connected, blow 'em away. */
 221         lprintf(7, "Closing socket %d\n", con->client_socket);
 222         close(con->client_socket);
 223
 224         /* This is where we used to check for scheduled shutdowns. */
 225
 226         /* Free up the memory used by this context */
 227         phree(con);
 228
 229         lprintf(7, "Done with RemoveContext()\n");
 230 }
 231
 232
 233
 234 /*
 235  * Get a dynamic symbol number for per-session user data.
 236  * This API call should be made only ONCE per symbol per citserver run.
 237  */
 238 int CtdlGetDynamicSymbol()
 239 {
 240         static unsigned int next_symbol = SYM_MAX;
 241         return ++next_symbol;
 242 }
 243
 244
 245
 246 /*
 247  * Return a pointer to some generic per-session user data.
 248  * (This function returns NULL if the requested symbol is not allocated.)
 249  *
 250  * NOTE: we use critical sections for allocating and de-allocating these,
 251  *       but not for locating one.
 252  */
 253 void *CtdlGetUserData(unsigned long requested_sym)
 254 {
 255         struct CtdlSessData *ptr;
 256
 257         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)
 258                 if (ptr->sym_id == requested_sym)
 259                         return(ptr->sym_data);
 260
 261         lprintf(2, "ERROR! CtdlGetUserData(%ld) symbol not allocated\n",
 262                 requested_sym);
 263         return NULL;
 264 }
 265
 266
 267 /*
 268  * Allocate some generic per-session user data.
 269  */
 270 void CtdlAllocUserData(unsigned long requested_sym, size_t num_bytes)
 271 {
 272         struct CtdlSessData *ptr;
 273
 274         lprintf(9, "CtdlAllocUserData(%ld) called\n", requested_sym);
 275
 276         /* Fail silently if the symbol is already registered. */
 277         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 278                 if (ptr->sym_id == requested_sym) {
 279                         return;
 280                 }
 281         }
 282
 283         /* Grab us some memory!  Dem's good eatin' !!  */
 284         ptr = mallok(sizeof(struct CtdlSessData));
 285         ptr->sym_id = requested_sym;
 286         ptr->sym_data = mallok(num_bytes);
 287         memset(ptr->sym_data, 0, num_bytes);
 288
 289         begin_critical_section(S_SESSION_TABLE);
 290         ptr->next = CC->FirstSessData;
 291         CC->FirstSessData = ptr;
 292         end_critical_section(S_SESSION_TABLE);
 293
 294         lprintf(9, "CtdlAllocUserData(%ld) finished\n", requested_sym);
 295 }
 296
 297
 298 /*
 299  * Change the size of a buffer allocated with CtdlAllocUserData()
 300  */
 301 void CtdlReallocUserData(unsigned long requested_sym, size_t num_bytes)
 302 {
 303         struct CtdlSessData *ptr;
 304
 305         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 306                 if (ptr->sym_id == requested_sym) {
 307                         ptr->sym_data = reallok(ptr->sym_data, num_bytes);
 308                         return;
 309                 }
 310         }
 311
 312         lprintf(2, "CtdlReallocUserData() ERROR: symbol %ld not found!\n",
 313                 requested_sym);
 314 }
 315
 316
 317
 318
 319
 320
 321 /*
 322  * cmd_info()  -  tell the client about this server
 323  */
 324 void cmd_info(void) {
 325         cprintf("%d Server info:\n", LISTING_FOLLOWS);
 326         cprintf("%d\n", CC->cs_pid);
 327         cprintf("%s\n", config.c_nodename);
 328         cprintf("%s\n", config.c_humannode);
 329         cprintf("%s\n", config.c_fqdn);
 330         cprintf("%s\n", CITADEL);
 331         cprintf("%d\n", REV_LEVEL);
 332         cprintf("%s\n", config.c_bbs_city);
 333         cprintf("%s\n", config.c_sysadm);
 334         cprintf("%d\n", SERVER_TYPE);
 335         cprintf("%s\n", config.c_moreprompt);
 336         cprintf("1\n"); /* 1 = yes, this system supports floors */
 337         cprintf("1\n"); /* 1 = we support the extended paging options */
 338         cprintf("%s\n", CC->cs_nonce);
 339         cprintf("000\n");
 340 }
 341
 342
 343 /*
 344  * returns an asterisk if there are any express messages waiting,
 345  * space otherwise.
 346  */
 347 char CtdlCheckExpress(void) {
 348         if (CC->FirstExpressMessage == NULL) {
 349                 return(' ');
 350                 }
 351         else {
 352                 return('*');
 353                 }
 354         }
 355
 356 void cmd_time(void)
 357 {
 358    time_t tv;
 359
 360    tv = time(NULL);
 361    localtime(&tv);
 362
 363    cprintf("%d %ld|%ld|%d\n", OK, (long)tv, timezone, daylight);
 364 }
 365
 366 /*
 367  * Check whether two hostnames match.
 368  * "Realname" should be an actual name of a client that is trying to connect;
 369  * "testname" should be the value we are comparing it with. The idea is that we
 370  * want to compare with both the abbreviated and fully-qualified versions of
 371  * "testname;" some people define "localhost" as "localhost.foo.com," etc.
 372  */
 373 static int hostnames_match(const char *realname, const char *testname) {
 374         struct hostent *he;
 375         int retval = 0;
 376
 377         if (!strcasecmp(realname, testname))
 378                 return 1;
 379
 380 #ifdef HAVE_NONREENTRANT_NETDB
 381         begin_critical_section(S_NETDB);
 382 #endif
 383
 384         if ((he = gethostbyname(testname)) != NULL)
 385                 if (!strcasecmp(realname, he->h_name))
 386                         retval = 1;
 387
 388 #ifdef HAVE_NONREENTRANT_NETDB
 389         end_critical_section(S_NETDB);
 390 #endif
 391
 392         return retval;
 393         }
 394
 395 /*
 396  * check a hostname against the public_clients file
 397  */
 398 int is_public_client(char *where)
 399 {
 400         char buf[SIZ];
 401         FILE *fp;
 402
 403         lprintf(9, "Checking whether %s is a public client\n", where);
 404
 405         if (hostnames_match(where, "localhost")) return(1);
 406         if (hostnames_match(where, config.c_fqdn)) return(1);
 407
 408         fp = fopen("public_clients","r");
 409         if (fp == NULL) return(0);
 410
 411         while (fgets(buf, sizeof buf, fp)!=NULL) {
 412                 while (isspace((buf[strlen(buf)-1])))
 413                         buf[strlen(buf)-1] = 0;
 414                 if (hostnames_match(where,buf)) {
 415                         fclose(fp);
 416                         return(1);
 417                         }
 418                 }
 419
 420         fclose(fp);
 421         return(0);
 422         }
 423
 424
 425 /*
 426  * the client is identifying itself to the server
 427  */
 428 void cmd_iden(char *argbuf)
 429 {
 430         int dev_code;
 431         int cli_code;
 432         int rev_level;
 433         char desc[SIZ];
 434         char from_host[SIZ];
 435         struct in_addr addr;
 436         int do_lookup = 0;
 437
 438         if (num_parms(argbuf)<4) {
 439                 cprintf("%d usage error\n",ERROR);
 440                 return;
 441         }
 442
 443         dev_code = extract_int(argbuf,0);
 444         cli_code = extract_int(argbuf,1);
 445         rev_level = extract_int(argbuf,2);
 446         extract(desc,argbuf,3);
 447
 448         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 449         from_host[sizeof from_host - 1] = 0;
 450         if (num_parms(argbuf)>=5) extract(from_host,argbuf,4);
 451
 452         CC->cs_clientdev = dev_code;
 453         CC->cs_clienttyp = cli_code;
 454         CC->cs_clientver = rev_level;
 455         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 456         CC->cs_clientname[31] = 0;
 457
 458         if (strlen(from_host) > 0) {
 459                 if (CC->is_local_socket) do_lookup = 1;
 460                 else if (is_public_client(CC->cs_host)) do_lookup = 1;
 461         }
 462
 463         if (do_lookup) {
 464                 lprintf(9, "Looking up hostname '%s'\n", from_host);
 465                 if ((addr.s_addr = inet_addr(from_host)) != -1) {
 466                         locate_host(CC->cs_host, sizeof CC->cs_host, &addr);
 467                 }
 468                 else {
 469                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 470                         CC->cs_host[sizeof CC->cs_host - 1] = 0;
 471                 }
 472         }
 473
 474         lprintf(7, "client %d/%d/%01d.%02d (%s)\n",
 475                 dev_code,
 476                 cli_code,
 477                 (rev_level / 100),
 478                 (rev_level % 100),
 479                 desc);
 480
 481         syslog(LOG_NOTICE,"session %d: client %d/%d/%01d.%02d (%s) from %s\n",
 482                 CC->cs_pid,
 483                 dev_code,
 484                 cli_code,
 485                 (rev_level / 100),
 486                 (rev_level % 100),
 487                 desc,
 488                 CC->cs_host);
 489         cprintf("%d Ok\n",OK);
 490 }
 491
 492
 493 /*
 494  * display system messages or help
 495  */
 496 void cmd_mesg(char *mname)
 497 {
 498         FILE *mfp;
 499         char targ[SIZ];
 500         char buf[SIZ];
 501         char *dirs[2];
 502
 503         extract(buf,mname,0);
 504
 505
 506         dirs[0]=mallok(64);
 507         dirs[1]=mallok(64);
 508         strcpy(dirs[0],"messages");
 509         strcpy(dirs[1],"help");
 510         mesg_locate(targ,sizeof targ,buf,2,(const char **)dirs);
 511         phree(dirs[0]);
 512         phree(dirs[1]);
 513
 514
 515         if (strlen(targ)==0) {
 516                 cprintf("%d '%s' not found.\n",ERROR,mname);
 517                 return;
 518                 }
 519
 520         mfp = fopen(targ,"r");
 521         if (mfp==NULL) {
 522                 cprintf("%d Cannot open '%s': %s\n",
 523                         ERROR,targ,strerror(errno));
 524                 return;
 525                 }
 526         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
 527
 528         while (fgets(buf, (SIZ-1), mfp)!=NULL) {
 529                 buf[strlen(buf)-1] = 0;
 530                 do_help_subst(buf);
 531                 cprintf("%s\n",buf);
 532                 }
 533
 534         fclose(mfp);
 535         cprintf("000\n");
 536         }
 537
 538
 539 /*
 540  * enter system messages or help
 541  */
 542 void cmd_emsg(char *mname)
 543 {
 544         FILE *mfp;
 545         char targ[SIZ];
 546         char buf[SIZ];
 547         char *dirs[2];
 548         int a;
 549
 550         if (CtdlAccessCheck(ac_aide)) return;
 551
 552         extract(buf,mname,0);
 553         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 554                 if (buf[a] == '/') buf[a] = '.';
 555                 }
 556
 557         dirs[0]=mallok(64);
 558         dirs[1]=mallok(64);
 559         strcpy(dirs[0],"messages");
 560         strcpy(dirs[1],"help");
 561         mesg_locate(targ,sizeof targ,buf,2,(const char**)dirs);
 562         phree(dirs[0]);
 563         phree(dirs[1]);
 564
 565         if (strlen(targ)==0) {
 566                 snprintf(targ, sizeof targ, "./help/%s", buf);
 567                 }
 568
 569         mfp = fopen(targ,"w");
 570         if (mfp==NULL) {
 571                 cprintf("%d Cannot open '%s': %s\n",
 572                         ERROR,targ,strerror(errno));
 573                 return;
 574                 }
 575         cprintf("%d %s\n", SEND_LISTING, targ);
 576
 577         while (client_gets(buf), strcmp(buf, "000")) {
 578                 fprintf(mfp, "%s\n", buf);
 579                 }
 580
 581         fclose(mfp);
 582         }
 583
 584
 585 /* Don't show the names of private rooms unless the viewing
 586  * user also knows the rooms.
 587  */
 588 void GenerateRoomDisplay(char *real_room,
 589                         struct CitContext *viewed,
 590                         struct CitContext *viewer) {
 591
 592         strcpy(real_room, viewed->quickroom.QRname);
 593         if (viewed->quickroom.QRflags & QR_MAILBOX) {
 594                 strcpy(real_room, &real_room[11]);
 595         }
 596         if (viewed->quickroom.QRflags & QR_PRIVATE) {
 597                 if ( (CtdlRoomAccess(&viewed->quickroom, &viewer->usersupp)
 598                    & UA_KNOWN) == 0) {
 599                         strcpy(real_room, "<private room>");
 600                 }
 601         }
 602
 603         if (viewed->cs_flags & CS_CHAT) {
 604                 while (strlen(real_room) < 14)
 605                         strcat(real_room, " ");
 606
 607                 strcpy(&real_room[14], "<chat>");
 608         }
 609
 610 }
 611
 612 /*
 613  * Convenience function.
 614  */
 615 int CtdlAccessCheck(int required_level) {
 616
 617         if (CC->internal_pgm) return(0);
 618         if (required_level >= ac_internal) {
 619                 cprintf("%d This is not a user-level command.\n",
 620                         ERROR+HIGHER_ACCESS_REQUIRED);
 621                 return(-1);
 622         }
 623
 624         if (CC->usersupp.axlevel >= 6) return(0);
 625         if (required_level >= ac_aide) {
 626                 cprintf("%d This command requires Aide access.\n",
 627                         ERROR+HIGHER_ACCESS_REQUIRED);
 628                 return(-1);
 629         }
 630
 631         if (is_room_aide()) return(0);
 632         if (required_level >= ac_room_aide) {
 633                 cprintf("%d This command requires Aide or Room Aide access.\n",
 634                         ERROR + HIGHER_ACCESS_REQUIRED);
 635                 return(-1);
 636         }
 637
 638         if (CC->logged_in) return(0);
 639         if (required_level >= ac_logged_in) {
 640                 cprintf("%d Not logged in.\n", ERROR+NOT_LOGGED_IN);
 641                 return(-1);
 642         }
 643
 644         /* shhh ... succeed quietly */
 645         return(0);
 646 }
 647
 648
 649
 650 /*
 651  * Terminate another running session
 652  */
 653 void cmd_term(char *cmdbuf)
 654 {
 655         int session_num;
 656         struct CitContext *ccptr;
 657         int found_it = 0;
 658         int allowed = 0;
 659
 660         session_num = extract_int(cmdbuf, 0);
 661         if (session_num == CC->cs_pid) {
 662                 cprintf("%d You can't kill your own session.\n", ERROR);
 663                 return;
 664         }
 665
 666         lprintf(9, "Locating session to kill\n");
 667         begin_critical_section(S_SESSION_TABLE);
 668         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 669                 if (session_num == ccptr->cs_pid) {
 670                         found_it = 1;
 671                         if ((ccptr->usersupp.usernum == CC->usersupp.usernum)
 672                            || (CC->usersupp.axlevel >= 6)) {
 673                                 allowed = 1;
 674                                 ccptr->kill_me = 1;
 675                         }
 676                         else {
 677                                 allowed = 0;
 678                         }
 679                 }
 680         }
 681         end_critical_section(S_SESSION_TABLE);
 682
 683         if (found_it) {
 684                 if (allowed) {
 685                         cprintf("%d Session terminated.\n", OK);
 686                 }
 687                 else {
 688                         cprintf("%d You are not allowed to do that.\n",
 689                                 ERROR + HIGHER_ACCESS_REQUIRED);
 690                 }
 691         }
 692         else {
 693                 cprintf("%d No such session.\n", ERROR);
 694         }
 695 }
 696
 697
 698
 699
 700
 701 /*
 702  * get the paginator prompt
 703  */
 704 void cmd_more(void) {
 705         cprintf("%d %s\n",OK,config.c_moreprompt);
 706         }
 707
 708 /*
 709  * echo
 710  */
 711 void cmd_echo(char *etext)
 712 {
 713         cprintf("%d %s\n",OK,etext);
 714         }
 715
 716
 717
 718 /*
 719  * identify as internal program
 720  */
 721 void cmd_ipgm(char *argbuf)
 722 {
 723         int secret;
 724
 725         secret = extract_int(argbuf, 0);
 726         if (secret == config.c_ipgm_secret) {
 727                 CC->internal_pgm = 1;
 728                 strcpy(CC->curr_user, "<internal program>");
 729                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 730                 cprintf("%d Authenticated as an internal program.\n",OK);
 731                 }
 732         else {
 733                 cprintf("%d Authentication failed.\n",ERROR);
 734                 lprintf(3, "Warning: ipgm authentication failed.\n");
 735                 }
 736         }
 737
 738
 739 /*
 740  * Shut down the server
 741  */
 742 void cmd_down(void) {
 743
 744         if (CtdlAccessCheck(ac_aide)) return;
 745
 746         cprintf("%d Shutting down server.  Goodbye.\n", OK);
 747         time_to_die = 1;
 748         }
 749
 750 /*
 751  * Schedule or cancel a server shutdown
 752  */
 753 void cmd_scdn(char *argbuf)
 754 {
 755         int new_state;
 756
 757         if (CtdlAccessCheck(ac_aide)) return;
 758
 759         new_state = extract_int(argbuf, 0);
 760         if ((new_state == 0) || (new_state == 1)) {
 761                 ScheduledShutdown = new_state;
 762                 }
 763         cprintf("%d %d\n", OK, ScheduledShutdown);
 764 }
 765
 766
 767 /*
 768  * Set or unset asynchronous protocol mode
 769  */
 770 void cmd_asyn(char *argbuf)
 771 {
 772         int new_state;
 773
 774         new_state = extract_int(argbuf, 0);
 775         if ((new_state == 0) || (new_state == 1)) {
 776                 CC->is_async = new_state;
 777         }
 778         cprintf("%d %d\n", OK, CC->is_async);
 779 }
 780
 781
 782 /*
 783  * Generate a "nonce" for APOP-style authentication.
 784  *
 785  * RFC 1725 et al specify a PID to be placed in front of the nonce.
 786  * Quoth BTX: That would be stupid.
 787  */
 788 void generate_nonce(struct CitContext *con) {
 789         struct timeval tv;
 790
 791         memset(con->cs_nonce, NONCE_SIZE, 0);
 792         gettimeofday(&tv, NULL);
 793         memset(con->cs_nonce, NONCE_SIZE, 0);
 794         snprintf(con->cs_nonce, NONCE_SIZE, "<%d%ld@%s>",
 795                 rand(), (long)tv.tv_usec, config.c_fqdn);
 796 }
 797
 798
 799
 800
 801 /*
 802  * Back-end function for starting a session
 803  */
 804 void begin_session(struct CitContext *con)
 805 {
 806         int len;
 807         struct sockaddr_in sin;
 808
 809         /*
 810          * Initialize some variables specific to our context.
 811          */
 812         con->logged_in = 0;
 813         con->internal_pgm = 0;
 814         con->download_fp = NULL;
 815         con->upload_fp = NULL;
 816         con->FirstExpressMessage = NULL;
 817         time(&con->lastcmd);
 818         time(&con->lastidle);
 819         strcpy(con->lastcmdname, "    ");
 820         strcpy(con->cs_clientname, "(unknown)");
 821         strcpy(con->curr_user, NLI);
 822         strcpy(con->net_node,"");
 823         strcpy(con->fake_username, "");
 824         strcpy(con->fake_postname, "");
 825         strcpy(con->fake_hostname, "");
 826         strcpy(con->fake_roomname, "");
 827         generate_nonce(con);
 828         snprintf(con->temp, sizeof con->temp, tmpnam(NULL));
 829         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 830         con->cs_host[sizeof con->cs_host - 1] = 0;
 831         len = sizeof sin;
 832         if (!CC->is_local_socket) {
 833                 if (!getpeername(con->client_socket,
 834                    (struct sockaddr *) &sin, &len))
 835                         locate_host(con->cs_host, sizeof con->cs_host, &sin.sin_addr);
 836         }
 837         else {
 838                 strcpy(con->cs_host, "");
 839         }
 840         con->cs_flags = 0;
 841         con->upload_type = UPL_FILE;
 842         con->dl_is_net = 0;
 843         con->FirstSessData = NULL;
 844
 845         con->nologin = 0;
 846         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 847                 con->nologin = 1;
 848
 849         lprintf(3, "Session started.\n");
 850
 851         /* Run any session startup routines registered by loadable modules */
 852         PerformSessionHooks(EVT_START);
 853
 854         rec_log(CL_CONNECT, "");
 855 }
 856
 857
 858 void citproto_begin_session() {
 859         if (CC->nologin==1) {
 860                 cprintf("%d %s: Too many users are already online "
 861                         "(maximum is %d)\n",
 862                         ERROR+MAX_SESSIONS_EXCEEDED,
 863                         config.c_nodename, config.c_maxsessions);
 864                 }
 865         else {
 866                 cprintf("%d %s Citadel/UX server ready.\n",
 867                         OK, config.c_nodename);
 868                 }
 869 }
 870
 871
 872
 873
 874 /*
 875  * This loop recognizes all server commands.
 876  */
 877 void do_command_loop(void) {
 878         char cmdbuf[SIZ];
 879
 880         time(&CC->lastcmd);
 881         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 882         if (client_gets(cmdbuf) < 1) {
 883                 lprintf(3, "Client socket is broken.  Ending session.\n");
 884                 CC->kill_me = 1;
 885                 return;
 886         }
 887         lprintf(5, "Citadel: %s\n", cmdbuf);
 888
 889         /*
 890          * Let other clients see the last command we executed, and
 891          * update the idle time, but not NOOP, PEXP, or GEXP.
 892          */
 893         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 894            && (strncasecmp(cmdbuf, "PEXP", 4))
 895            && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
 896                 strcpy(CC->lastcmdname, "    ");
 897                 safestrncpy(CC->lastcmdname, cmdbuf,
 898                         sizeof(CC->lastcmdname) );
 899                 time(&CC->lastidle);
 900                 }
 901
 902         if ((strncasecmp(cmdbuf, "ENT0", 4))
 903            && (strncasecmp(cmdbuf, "MESG", 4))
 904            && (strncasecmp(cmdbuf, "MSGS", 4)))
 905         {
 906            CC->cs_flags &= ~CS_POSTING;
 907         }
 908
 909         if (!strncasecmp(cmdbuf,"NOOP",4)) {
 910                 cprintf("%d%cok\n",OK,CtdlCheckExpress());
 911                 }
 912
 913         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 914                 cprintf("%d Goodbye.\n",OK);
 915                 CC->kill_me = 1;
 916                 }
 917
 918         else if (!strncasecmp(cmdbuf,"ASYN",4)) {
 919                 cmd_asyn(&cmdbuf[5]);
 920                 }
 921
 922         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 923                 if (CC->logged_in) logout(CC);
 924                 cprintf("%d logged out.\n",OK);
 925                 }
 926
 927         else if (!strncasecmp(cmdbuf,"USER",4)) {
 928                 cmd_user(&cmdbuf[5]);
 929                 }
 930
 931         else if (!strncasecmp(cmdbuf,"PASS",4)) {
 932                 cmd_pass(&cmdbuf[5]);
 933                 }
 934
 935         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 936                 cmd_newu(&cmdbuf[5]);
 937                 }
 938
 939         else if (!strncasecmp(cmdbuf,"CREU",4)) {
 940                 cmd_creu(&cmdbuf[5]);
 941                 }
 942
 943         else if (!strncasecmp(cmdbuf,"SETP",4)) {
 944                 cmd_setp(&cmdbuf[5]);
 945                 }
 946
 947         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 948                 cmd_lrms(&cmdbuf[5]);
 949                 }
 950
 951         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
 952                 cmd_lkra(&cmdbuf[5]);
 953                 }
 954
 955         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
 956                 cmd_lkrn(&cmdbuf[5]);
 957                 }
 958
 959         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
 960                 cmd_lkro(&cmdbuf[5]);
 961                 }
 962
 963         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
 964                 cmd_lzrm(&cmdbuf[5]);
 965                 }
 966
 967         else if (!strncasecmp(cmdbuf,"GETU",4)) {
 968                 cmd_getu();
 969                 }
 970
 971         else if (!strncasecmp(cmdbuf,"SETU",4)) {
 972                 cmd_setu(&cmdbuf[5]);
 973                 }
 974
 975         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
 976                 cmd_goto(&cmdbuf[5]);
 977                 }
 978
 979         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
 980                 cmd_msgs(&cmdbuf[5]);
 981                 }
 982
 983         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
 984                 cmd_whok();
 985                 }
 986
 987         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
 988                 cmd_rdir();
 989                 }
 990
 991         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
 992                 cmd_msg0(&cmdbuf[5]);
 993                 }
 994
 995         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
 996                 cmd_msg2(&cmdbuf[5]);
 997                 }
 998
 999         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
1000                 cmd_msg3(&cmdbuf[5]);
1001                 }
1002
1003         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
1004                 cmd_msg4(&cmdbuf[5]);
1005                 }
1006
1007         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
1008                 cmd_opna(&cmdbuf[5]);
1009                 }
1010
1011         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1012                 cmd_info();
1013                 }
1014
1015         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1016                 cmd_slrp(&cmdbuf[5]);
1017                 }
1018
1019         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1020                 cmd_invt_kick(&cmdbuf[5],1);
1021                 }
1022
1023         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1024                 cmd_invt_kick(&cmdbuf[5],0);
1025                 }
1026
1027         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1028                 cmd_getr();
1029                 }
1030
1031         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1032                 cmd_setr(&cmdbuf[5]);
1033                 }
1034
1035         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1036                 cmd_geta();
1037                 }
1038
1039         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1040                 cmd_seta(&cmdbuf[5]);
1041                 }
1042
1043         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1044                 cmd_ent0(&cmdbuf[5]);
1045                 }
1046
1047         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1048                 cmd_rinf();
1049                 }
1050
1051         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1052                 cmd_dele(&cmdbuf[5]);
1053                 }
1054
1055         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1056                 cmd_kill(&cmdbuf[5]);
1057                 }
1058
1059         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1060                 cmd_cre8(&cmdbuf[5]);
1061                 }
1062
1063         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1064                 cmd_move(&cmdbuf[5]);
1065                 }
1066
1067         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1068                 cmd_forg();
1069                 }
1070
1071         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1072                 cmd_mesg(&cmdbuf[5]);
1073                 }
1074
1075         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1076                 cmd_emsg(&cmdbuf[5]);
1077                 }
1078
1079         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1080                 cmd_gnur();
1081                 }
1082
1083         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1084                 cmd_vali(&cmdbuf[5]);
1085                 }
1086
1087         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1088                 cmd_einf(&cmdbuf[5]);
1089                 }
1090
1091         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1092                 cmd_list();
1093                 }
1094
1095         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1096                 cmd_chek();
1097                 }
1098
1099         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1100                 cmd_delf(&cmdbuf[5]);
1101                 }
1102
1103         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1104                 cmd_movf(&cmdbuf[5]);
1105                 }
1106
1107         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1108                 cmd_netf(&cmdbuf[5]);
1109                 }
1110
1111         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1112                 cmd_open(&cmdbuf[5]);
1113                 }
1114
1115         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1116                 cmd_clos();
1117                 }
1118
1119         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1120                 cmd_uopn(&cmdbuf[5]);
1121                 }
1122
1123         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1124                 cmd_ucls(&cmdbuf[5]);
1125                 }
1126
1127         else if (!strncasecmp(cmdbuf,"READ",4)) {
1128                 cmd_read(&cmdbuf[5]);
1129                 }
1130
1131         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1132                 cmd_writ(&cmdbuf[5]);
1133                 }
1134
1135         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1136                 cmd_qusr(&cmdbuf[5]);
1137                 }
1138
1139         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1140                 cmd_echo(&cmdbuf[5]);
1141                 }
1142
1143         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1144                 cmd_oimg(&cmdbuf[5]);
1145                 }
1146
1147         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1148                 cmd_more();
1149                 }
1150
1151         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1152                 cmd_ndop(&cmdbuf[5]);
1153                 }
1154
1155         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1156                 cmd_nuop(&cmdbuf[5]);
1157                 }
1158
1159         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1160                 cmd_lflr();
1161                 }
1162
1163         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1164                 cmd_cflr(&cmdbuf[5]);
1165                 }
1166
1167         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1168                 cmd_kflr(&cmdbuf[5]);
1169                 }
1170
1171         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1172                 cmd_eflr(&cmdbuf[5]);
1173                 }
1174
1175         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1176                 cmd_iden(&cmdbuf[5]);
1177                 }
1178
1179         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1180                 cmd_ipgm(&cmdbuf[5]);
1181                 }
1182
1183         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1184                 cmd_term(&cmdbuf[5]);
1185                 }
1186
1187         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1188                 cmd_down();
1189                 }
1190
1191         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1192                 cmd_scdn(&cmdbuf[5]);
1193                 }
1194
1195         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1196                 cmd_uimg(&cmdbuf[5]);
1197                 }
1198
1199         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1200                 cmd_time();
1201                 }
1202
1203         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1204                 cmd_agup(&cmdbuf[5]);
1205                 }
1206
1207         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1208                 cmd_asup(&cmdbuf[5]);
1209                 }
1210
1211         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1212                 cmd_gpex(&cmdbuf[5]);
1213                 }
1214
1215         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1216                 cmd_spex(&cmdbuf[5]);
1217                 }
1218
1219         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1220                 cmd_conf(&cmdbuf[5]);
1221                 }
1222
1223         else if (!strncasecmp(cmdbuf, "SEEN", 4)) {
1224                 cmd_seen(&cmdbuf[5]);
1225                 }
1226
1227 #ifdef DEBUG_MEMORY_LEAKS
1228         else if (!strncasecmp(cmdbuf, "LEAK", 4)) {
1229                 dump_tracked();
1230                 }
1231 #endif
1232
1233         else if (!DLoader_Exec_Cmd(cmdbuf))
1234                 {
1235                    cprintf("%d Unrecognized or unsupported command.\n",
1236                             ERROR);
1237                 }
1238
1239         /* Run any after-each-command outines registered by modules */
1240         PerformSessionHooks(EVT_CMD);
1241 }