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 "serv_extensions.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 "msgbase.h"
  51 #include "support.h"
  52 #include "locate_host.h"
  53 #include "room_ops.h"
  54 #include "file_ops.h"
  55 #include "policy.h"
  56 #include "control.h"
  57 #include "tools.h"
  58
  59 #ifndef HAVE_SNPRINTF
  60 #include "snprintf.h"
  61 #endif
  62
  63 struct CitContext *ContextList = NULL;
  64 char *unique_session_numbers;
  65 int ScheduledShutdown = 0;
  66 int do_defrag = 0;
  67 time_t server_startup_time;
  68
  69 /*
  70  * Various things that need to be initialized at startup
  71  */
  72 void master_startup(void) {
  73         struct timeval tv;
  74         struct quickroom qrbuf;
  75
  76         lprintf(9, "master_startup() started\n");
  77         time(&server_startup_time);
  78
  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, 0);
  90         create_room(AIDEROOM,           3, "", 0, 1, 0);
  91         create_room(SYSCONFIGROOM,      3, "", 0, 1, 0);
  92         create_room(config.c_twitroom,  0, "", 0, 1, 0);
  93
  94         /* The "Local System Configuration" room doesn't need to be visible */
  95         if (lgetroom(&qrbuf, SYSCONFIGROOM) == 0) {
  96                 qrbuf.QRflags2 |= QR2_SYSTEM;
  97                 lputroom(&qrbuf);
  98         }
  99
 100
 101         lprintf(7, "Seeding the pseudo-random number generator...\n");
 102         gettimeofday(&tv, NULL);
 103         srand(tv.tv_usec);
 104         lprintf(9, "master_startup() finished\n");
 105 }
 106
 107
 108
 109 /*
 110  * Cleanup routine to be called when the server is shutting down.
 111  * WARNING: It's no longer safe to call this function to force a shutdown.
 112  * Instead, set time_to_die = 1.
 113  */
 114 void master_cleanup(void) {
 115         struct CleanupFunctionHook *fcn;
 116
 117         /* Run any cleanup routines registered by loadable modules */
 118         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
 119                 (*fcn->h_function_pointer)();
 120         }
 121
 122         /* Close databases */
 123         lprintf(7, "Closing databases\n");
 124         close_databases();
 125
 126         /* Do system-dependent stuff */
 127         sysdep_master_cleanup();
 128
 129         /* Now go away. */
 130         lprintf(3, "citserver: exiting.\n");
 131         fflush(stdout); fflush(stderr);
 132         exit(0);
 133 }
 134
 135
 136 /*
 137  * Free any per-session data allocated by modules or whatever
 138  */
 139 void deallocate_user_data(struct CitContext *con)
 140 {
 141         struct CtdlSessData *ptr;
 142
 143         begin_critical_section(S_SESSION_TABLE);
 144         while (con->FirstSessData != NULL) {
 145                 lprintf(9, "Deallocating user data symbol %ld\n",
 146                         con->FirstSessData->sym_id);
 147                 if (con->FirstSessData->sym_data != NULL)
 148                         phree(con->FirstSessData->sym_data);
 149                 ptr = con->FirstSessData->next;
 150                 phree(con->FirstSessData);
 151                 con->FirstSessData = ptr;
 152         }
 153         end_critical_section(S_SESSION_TABLE);
 154 }
 155
 156
 157
 158
 159 /*
 160  * Terminate a session and remove its context data structure.
 161  */
 162 void RemoveContext (struct CitContext *con)
 163 {
 164         struct CitContext *ptr = NULL;
 165         struct CitContext *ToFree = NULL;
 166
 167         lprintf(9, "RemoveContext() called\n");
 168         if (con==NULL) {
 169                 lprintf(5, "WARNING: RemoveContext() called with NULL!\n");
 170                 return;
 171         }
 172
 173         /* Remove the context from the global context list.  This needs
 174          * to get done FIRST to avoid concurrency problems.  It is *vitally*
 175          * important to keep num_sessions accurate!!
 176          */
 177         lprintf(7, "Removing context for session %d\n", con->cs_pid);
 178         begin_critical_section(S_SESSION_TABLE);
 179         if (ContextList == con) {
 180                 ToFree = ContextList;
 181                 ContextList = ContextList->next;
 182                 --num_sessions;
 183         }
 184         else {
 185                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
 186                         if (ptr->next == con) {
 187                                 ToFree = ptr->next;
 188                                 ptr->next = ptr->next->next;
 189                                 --num_sessions;
 190                         }
 191                 }
 192         }
 193         end_critical_section(S_SESSION_TABLE);
 194
 195         if (ToFree == NULL) {
 196                 lprintf(9, "RemoveContext() found nothing to remove\n");
 197                 return;
 198         }
 199
 200         /* Run any cleanup routines registered by loadable modules.
 201          * Note 1: This must occur *before* deallocate_user_data() because the
 202          *         cleanup functions might touch dynamic session data.
 203          * Note 2: We have to "become_session()" because the cleanup functions
 204          *         might make references to "CC" assuming it's the right one.
 205          */
 206         become_session(con);
 207         PerformSessionHooks(EVT_STOP);
 208         become_session(NULL);
 209
 210         /* Now handle all of the administrivia. */
 211         lprintf(7, "Calling logout(%d)\n", con->cs_pid);
 212         logout(con);
 213
 214         unlink(con->temp);
 215         lprintf(3, "[%3d] Session ended.\n", con->cs_pid);
 216         syslog(LOG_NOTICE,"session %d: ended", con->cs_pid);
 217
 218         /* Deallocate any user-data attached to this session */
 219         deallocate_user_data(con);
 220
 221         /* If the client is still connected, blow 'em away. */
 222         lprintf(7, "Closing socket %d\n", con->client_socket);
 223         close(con->client_socket);
 224
 225         /* This is where we used to check for scheduled shutdowns. */
 226
 227         /* Free up the memory used by this context */
 228         phree(con);
 229
 230         lprintf(7, "Done with RemoveContext()\n");
 231 }
 232
 233
 234
 235 /*
 236  * Get a dynamic symbol number for per-session user data.
 237  * This API call should be made only ONCE per symbol per citserver run.
 238  */
 239 int CtdlGetDynamicSymbol()
 240 {
 241         static unsigned int next_symbol = SYM_MAX;
 242         return ++next_symbol;
 243 }
 244
 245
 246
 247 /*
 248  * Return a pointer to some generic per-session user data.
 249  * (This function returns NULL if the requested symbol is not allocated.)
 250  *
 251  * NOTE: we use critical sections for allocating and de-allocating these,
 252  *       but not for locating one.
 253  */
 254 void *CtdlGetUserData(unsigned long requested_sym)
 255 {
 256         struct CtdlSessData *ptr;
 257
 258         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)
 259                 if (ptr->sym_id == requested_sym)
 260                         return(ptr->sym_data);
 261
 262         lprintf(2, "ERROR! CtdlGetUserData(%ld) symbol not allocated\n",
 263                 requested_sym);
 264         return NULL;
 265 }
 266
 267
 268 /*
 269  * Allocate some generic per-session user data.
 270  */
 271 void CtdlAllocUserData(unsigned long requested_sym, size_t num_bytes)
 272 {
 273         struct CtdlSessData *ptr;
 274
 275         lprintf(9, "CtdlAllocUserData(%ld) called\n", requested_sym);
 276
 277         /* Fail silently if the symbol is already registered. */
 278         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 279                 if (ptr->sym_id == requested_sym) {
 280                         return;
 281                 }
 282         }
 283
 284         /* Grab us some memory!  Dem's good eatin' !!  */
 285         ptr = mallok(sizeof(struct CtdlSessData));
 286         ptr->sym_id = requested_sym;
 287         ptr->sym_data = mallok(num_bytes);
 288         memset(ptr->sym_data, 0, num_bytes);
 289
 290         begin_critical_section(S_SESSION_TABLE);
 291         ptr->next = CC->FirstSessData;
 292         CC->FirstSessData = ptr;
 293         end_critical_section(S_SESSION_TABLE);
 294
 295         lprintf(9, "CtdlAllocUserData(%ld) finished\n", requested_sym);
 296 }
 297
 298
 299 /*
 300  * Change the size of a buffer allocated with CtdlAllocUserData()
 301  */
 302 void CtdlReallocUserData(unsigned long requested_sym, size_t num_bytes)
 303 {
 304         struct CtdlSessData *ptr;
 305
 306         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 307                 if (ptr->sym_id == requested_sym) {
 308                         ptr->sym_data = reallok(ptr->sym_data, num_bytes);
 309                         return;
 310                 }
 311         }
 312
 313         lprintf(2, "CtdlReallocUserData() ERROR: symbol %ld not found!\n",
 314                 requested_sym);
 315 }
 316
 317
 318
 319
 320
 321
 322 /*
 323  * cmd_info()  -  tell the client about this server
 324  */
 325 void cmd_info(void) {
 326         cprintf("%d Server info:\n", LISTING_FOLLOWS);
 327         cprintf("%d\n", CC->cs_pid);
 328         cprintf("%s\n", config.c_nodename);
 329         cprintf("%s\n", config.c_humannode);
 330         cprintf("%s\n", config.c_fqdn);
 331         cprintf("%s\n", CITADEL);
 332         cprintf("%d\n", REV_LEVEL);
 333         cprintf("%s\n", config.c_bbs_city);
 334         cprintf("%s\n", config.c_sysadm);
 335         cprintf("%d\n", SERVER_TYPE);
 336         cprintf("%s\n", config.c_moreprompt);
 337         cprintf("1\n"); /* 1 = yes, this system supports floors */
 338         cprintf("1\n"); /* 1 = we support the extended paging options */
 339         cprintf("%s\n", CC->cs_nonce);
 340         cprintf("1\n"); /* 1 = yes, this system supports the QNOP command */
 341         cprintf("000\n");
 342 }
 343
 344
 345 /*
 346  * returns an asterisk if there are any express messages waiting,
 347  * space otherwise.
 348  */
 349 char CtdlCheckExpress(void) {
 350         if (CC->FirstExpressMessage == NULL) {
 351                 return(' ');
 352         }
 353         else {
 354                 return('*');
 355         }
 356 }
 357
 358 void cmd_time(void)
 359 {
 360    time_t tv;
 361    struct tm *tmp;
 362
 363    tv = time(NULL);
 364    tmp = localtime(&tv);
 365
 366    /* timezone and daylight global variables are not portable. */
 367 #ifdef HAVE_STRUCT_TM_TM_GMTOFF
 368    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, tmp->tm_gmtoff, tmp->tm_isdst);
 369 #else
 370    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, timezone, tmp->tm_isdst);
 371 #endif
 372 }
 373
 374 /*
 375  * Check whether two hostnames match.
 376  * "Realname" should be an actual name of a client that is trying to connect;
 377  * "testname" should be the value we are comparing it with. The idea is that we
 378  * want to compare with both the abbreviated and fully-qualified versions of
 379  * "testname;" some people define "localhost" as "localhost.foo.com," etc.
 380  */
 381 static int hostnames_match(const char *realname, const char *testname) {
 382         struct hostent *he;
 383         int retval = 0;
 384
 385         if (!strcasecmp(realname, testname)) {
 386                 return(1);
 387         }
 388
 389 #ifdef HAVE_NONREENTRANT_NETDB
 390         begin_critical_section(S_NETDB);
 391 #endif
 392
 393         if ((he = gethostbyname(testname)) != NULL) {
 394                 if (!strcasecmp(realname, he->h_name)) {
 395                         retval = 1;
 396                 }
 397         }
 398
 399 #ifdef HAVE_NONREENTRANT_NETDB
 400         end_critical_section(S_NETDB);
 401 #endif
 402
 403         return retval;
 404 }
 405
 406 /*
 407  * check a hostname against the public_clients file
 408  */
 409 int is_public_client(char *where)
 410 {
 411         char buf[SIZ];
 412         FILE *fp;
 413
 414         lprintf(9, "Checking whether %s is a public client\n", where);
 415
 416         if (hostnames_match(where, "localhost")) return(1);
 417         if (hostnames_match(where, config.c_fqdn)) return(1);
 418
 419         fp = fopen("public_clients","r");
 420         if (fp == NULL) return(0);
 421
 422         while (fgets(buf, sizeof buf, fp)!=NULL) {
 423                 while (isspace((buf[strlen(buf)-1])))
 424                         buf[strlen(buf)-1] = 0;
 425                 if (hostnames_match(where,buf)) {
 426                         fclose(fp);
 427                         return(1);
 428                 }
 429         }
 430
 431         fclose(fp);
 432         return(0);
 433 }
 434
 435
 436 /*
 437  * the client is identifying itself to the server
 438  */
 439 void cmd_iden(char *argbuf)
 440 {
 441         int dev_code;
 442         int cli_code;
 443         int rev_level;
 444         char desc[SIZ];
 445         char from_host[SIZ];
 446         struct in_addr addr;
 447         int do_lookup = 0;
 448
 449         if (num_parms(argbuf)<4) {
 450                 cprintf("%d usage error\n",ERROR);
 451                 return;
 452         }
 453
 454         dev_code = extract_int(argbuf,0);
 455         cli_code = extract_int(argbuf,1);
 456         rev_level = extract_int(argbuf,2);
 457         extract(desc,argbuf,3);
 458
 459         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 460         from_host[sizeof from_host - 1] = 0;
 461         if (num_parms(argbuf)>=5) extract(from_host,argbuf,4);
 462
 463         CC->cs_clientdev = dev_code;
 464         CC->cs_clienttyp = cli_code;
 465         CC->cs_clientver = rev_level;
 466         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 467         CC->cs_clientname[31] = 0;
 468
 469         if (strlen(from_host) > 0) {
 470                 if (CC->is_local_socket) do_lookup = 1;
 471                 else if (is_public_client(CC->cs_host)) do_lookup = 1;
 472         }
 473
 474         if (do_lookup) {
 475                 lprintf(9, "Looking up hostname '%s'\n", from_host);
 476                 if ((addr.s_addr = inet_addr(from_host)) != -1) {
 477                         locate_host(CC->cs_host, sizeof CC->cs_host, &addr);
 478                 }
 479                 else {
 480                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 481                         CC->cs_host[sizeof CC->cs_host - 1] = 0;
 482                 }
 483         }
 484
 485         lprintf(7, "client %d/%d/%01d.%02d (%s)\n",
 486                 dev_code,
 487                 cli_code,
 488                 (rev_level / 100),
 489                 (rev_level % 100),
 490                 desc);
 491
 492         syslog(LOG_NOTICE,"session %d: client %d/%d/%01d.%02d (%s) from %s\n",
 493                 CC->cs_pid,
 494                 dev_code,
 495                 cli_code,
 496                 (rev_level / 100),
 497                 (rev_level % 100),
 498                 desc,
 499                 CC->cs_host);
 500         cprintf("%d Ok\n",CIT_OK);
 501 }
 502
 503
 504 /*
 505  * display system messages or help
 506  */
 507 void cmd_mesg(char *mname)
 508 {
 509         FILE *mfp;
 510         char targ[SIZ];
 511         char buf[SIZ];
 512         char buf2[SIZ];
 513         char *dirs[2];
 514
 515         extract(buf,mname,0);
 516
 517         dirs[0]=mallok(64);
 518         dirs[1]=mallok(64);
 519         strcpy(dirs[0],"messages");
 520         strcpy(dirs[1],"help");
 521         snprintf(buf2, sizeof buf2, "%s.%d.%d", buf, CC->cs_clientdev, CC->cs_clienttyp);
 522         mesg_locate(targ,sizeof targ,buf2,2,(const char **)dirs);
 523         if (strlen(targ) == 0) {
 524                 snprintf(buf2, sizeof buf2, "%s.%d", buf, CC->cs_clientdev);
 525                 mesg_locate(targ,sizeof targ,buf2,2,(const char **)dirs);
 526                 if (strlen(targ) == 0) {
 527                         mesg_locate(targ,sizeof targ,buf,2,(const char **)dirs);
 528                 }
 529         }
 530         phree(dirs[0]);
 531         phree(dirs[1]);
 532
 533         if (strlen(targ)==0) {
 534                 cprintf("%d '%s' not found.\n",ERROR,mname);
 535                 return;
 536         }
 537
 538         mfp = fopen(targ,"r");
 539         if (mfp==NULL) {
 540                 cprintf("%d Cannot open '%s': %s\n",
 541                         ERROR,targ,strerror(errno));
 542                 return;
 543         }
 544         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
 545
 546         while (fgets(buf, (SIZ-1), mfp)!=NULL) {
 547                 buf[strlen(buf)-1] = 0;
 548                 do_help_subst(buf);
 549                 cprintf("%s\n",buf);
 550         }
 551
 552         fclose(mfp);
 553         cprintf("000\n");
 554 }
 555
 556
 557 /*
 558  * enter system messages or help
 559  */
 560 void cmd_emsg(char *mname)
 561 {
 562         FILE *mfp;
 563         char targ[SIZ];
 564         char buf[SIZ];
 565         char *dirs[2];
 566         int a;
 567
 568         if (CtdlAccessCheck(ac_aide)) return;
 569
 570         extract(buf,mname,0);
 571         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 572                 if (buf[a] == '/') buf[a] = '.';
 573         }
 574
 575         dirs[0]=mallok(64);
 576         dirs[1]=mallok(64);
 577         strcpy(dirs[0],"messages");
 578         strcpy(dirs[1],"help");
 579         mesg_locate(targ,sizeof targ,buf,2,(const char**)dirs);
 580         phree(dirs[0]);
 581         phree(dirs[1]);
 582
 583         if (strlen(targ)==0) {
 584                 snprintf(targ, sizeof targ, "./help/%s", buf);
 585         }
 586
 587         mfp = fopen(targ,"w");
 588         if (mfp==NULL) {
 589                 cprintf("%d Cannot open '%s': %s\n",
 590                         ERROR,targ,strerror(errno));
 591                 return;
 592         }
 593         cprintf("%d %s\n", SEND_LISTING, targ);
 594
 595         while (client_gets(buf), strcmp(buf, "000")) {
 596                 fprintf(mfp, "%s\n", buf);
 597         }
 598
 599         fclose(mfp);
 600 }
 601
 602
 603 /* Don't show the names of private rooms unless the viewing
 604  * user also knows the rooms.
 605  */
 606 void GenerateRoomDisplay(char *real_room,
 607                         struct CitContext *viewed,
 608                         struct CitContext *viewer) {
 609
 610         strcpy(real_room, viewed->quickroom.QRname);
 611         if (viewed->quickroom.QRflags & QR_MAILBOX) {
 612                 strcpy(real_room, &real_room[11]);
 613         }
 614         if (viewed->quickroom.QRflags & QR_PRIVATE) {
 615                 if ( (CtdlRoomAccess(&viewed->quickroom, &viewer->usersupp)
 616                    & UA_KNOWN) == 0) {
 617                         strcpy(real_room, "<private room>");
 618                 }
 619         }
 620
 621         if (viewed->cs_flags & CS_CHAT) {
 622                 while (strlen(real_room) < 14)
 623                         strcat(real_room, " ");
 624
 625                 strcpy(&real_room[14], "<chat>");
 626         }
 627
 628 }
 629
 630 /*
 631  * Convenience function.
 632  */
 633 int CtdlAccessCheck(int required_level) {
 634
 635         if (CC->internal_pgm) return(0);
 636         if (required_level >= ac_internal) {
 637                 cprintf("%d This is not a user-level command.\n",
 638                         ERROR+HIGHER_ACCESS_REQUIRED);
 639                 return(-1);
 640         }
 641
 642         if (CC->usersupp.axlevel >= 6) return(0);
 643         if (required_level >= ac_aide) {
 644                 cprintf("%d This command requires Aide access.\n",
 645                         ERROR+HIGHER_ACCESS_REQUIRED);
 646                 return(-1);
 647         }
 648
 649         if (is_room_aide()) return(0);
 650         if (required_level >= ac_room_aide) {
 651                 cprintf("%d This command requires Aide or Room Aide access.\n",
 652                         ERROR + HIGHER_ACCESS_REQUIRED);
 653                 return(-1);
 654         }
 655
 656         if (CC->logged_in) return(0);
 657         if (required_level >= ac_logged_in) {
 658                 cprintf("%d Not logged in.\n", ERROR+NOT_LOGGED_IN);
 659                 return(-1);
 660         }
 661
 662         /* shhh ... succeed quietly */
 663         return(0);
 664 }
 665
 666
 667
 668 /*
 669  * Terminate another running session
 670  */
 671 void cmd_term(char *cmdbuf)
 672 {
 673         int session_num;
 674         struct CitContext *ccptr;
 675         int found_it = 0;
 676         int allowed = 0;
 677
 678         session_num = extract_int(cmdbuf, 0);
 679         if (session_num == CC->cs_pid) {
 680                 cprintf("%d You can't kill your own session.\n", ERROR);
 681                 return;
 682         }
 683
 684         lprintf(9, "Locating session to kill\n");
 685         begin_critical_section(S_SESSION_TABLE);
 686         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 687                 if (session_num == ccptr->cs_pid) {
 688                         found_it = 1;
 689                         if ((ccptr->usersupp.usernum == CC->usersupp.usernum)
 690                            || (CC->usersupp.axlevel >= 6)) {
 691                                 allowed = 1;
 692                                 ccptr->kill_me = 1;
 693                         }
 694                         else {
 695                                 allowed = 0;
 696                         }
 697                 }
 698         }
 699         end_critical_section(S_SESSION_TABLE);
 700
 701         if (found_it) {
 702                 if (allowed) {
 703                         cprintf("%d Session terminated.\n", CIT_OK);
 704                 }
 705                 else {
 706                         cprintf("%d You are not allowed to do that.\n",
 707                                 ERROR + HIGHER_ACCESS_REQUIRED);
 708                 }
 709         }
 710         else {
 711                 cprintf("%d No such session.\n", ERROR);
 712         }
 713 }
 714
 715
 716
 717
 718
 719 /*
 720  * get the paginator prompt
 721  */
 722 void cmd_more(void) {
 723         cprintf("%d %s\n", CIT_OK, config.c_moreprompt);
 724 }
 725
 726 /*
 727  * echo
 728  */
 729 void cmd_echo(char *etext)
 730 {
 731         cprintf("%d %s\n", CIT_OK, etext);
 732 }
 733
 734
 735
 736 /*
 737  * identify as internal program
 738  */
 739 void cmd_ipgm(char *argbuf)
 740 {
 741         int secret;
 742
 743         secret = extract_int(argbuf, 0);
 744         if (secret == config.c_ipgm_secret) {
 745                 CC->internal_pgm = 1;
 746                 strcpy(CC->curr_user, "<internal program>");
 747                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 748                 cprintf("%d Authenticated as an internal program.\n",CIT_OK);
 749         }
 750         else {
 751                 cprintf("%d Authentication failed.\n",ERROR);
 752                 lprintf(3, "Warning: ipgm authentication failed.\n");
 753         }
 754 }
 755
 756
 757 /*
 758  * Shut down the server
 759  */
 760 void cmd_down(void) {
 761
 762         if (CtdlAccessCheck(ac_aide)) return;
 763
 764         cprintf("%d Shutting down server.  Goodbye.\n", CIT_OK);
 765         time_to_die = 1;
 766 }
 767
 768 /*
 769  * Schedule or cancel a server shutdown
 770  */
 771 void cmd_scdn(char *argbuf)
 772 {
 773         int new_state;
 774
 775         if (CtdlAccessCheck(ac_aide)) return;
 776
 777         new_state = extract_int(argbuf, 0);
 778         if ((new_state == 0) || (new_state == 1)) {
 779                 ScheduledShutdown = new_state;
 780         }
 781         cprintf("%d %d\n", CIT_OK, ScheduledShutdown);
 782 }
 783
 784
 785 /*
 786  * Set or unset asynchronous protocol mode
 787  */
 788 void cmd_asyn(char *argbuf)
 789 {
 790         int new_state;
 791
 792         new_state = extract_int(argbuf, 0);
 793         if ((new_state == 0) || (new_state == 1)) {
 794                 CC->is_async = new_state;
 795         }
 796         cprintf("%d %d\n", CIT_OK, CC->is_async);
 797 }
 798
 799
 800 /*
 801  * Generate a "nonce" for APOP-style authentication.
 802  *
 803  * RFC 1725 et al specify a PID to be placed in front of the nonce.
 804  * Quoth BTX: That would be stupid.
 805  */
 806 void generate_nonce(struct CitContext *con) {
 807         struct timeval tv;
 808
 809         memset(con->cs_nonce, NONCE_SIZE, 0);
 810         gettimeofday(&tv, NULL);
 811         memset(con->cs_nonce, NONCE_SIZE, 0);
 812         snprintf(con->cs_nonce, NONCE_SIZE, "<%d%ld@%s>",
 813                 rand(), (long)tv.tv_usec, config.c_fqdn);
 814 }
 815
 816
 817
 818
 819 /*
 820  * Back-end function for starting a session
 821  */
 822 void begin_session(struct CitContext *con)
 823 {
 824         int len;        /* should be socklen_t but doesn't work on Macintosh */
 825         struct sockaddr_in sin;
 826
 827         /*
 828          * Initialize some variables specific to our context.
 829          */
 830         con->logged_in = 0;
 831         con->internal_pgm = 0;
 832         con->download_fp = NULL;
 833         con->upload_fp = NULL;
 834         con->FirstExpressMessage = NULL;
 835         time(&con->lastcmd);
 836         time(&con->lastidle);
 837         strcpy(con->lastcmdname, "    ");
 838         strcpy(con->cs_clientname, "(unknown)");
 839         strcpy(con->curr_user, NLI);
 840         strcpy(con->net_node,"");
 841         strcpy(con->fake_username, "");
 842         strcpy(con->fake_postname, "");
 843         strcpy(con->fake_hostname, "");
 844         strcpy(con->fake_roomname, "");
 845         generate_nonce(con);
 846         snprintf(con->temp, sizeof con->temp, tmpnam(NULL));
 847         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 848         con->cs_host[sizeof con->cs_host - 1] = 0;
 849         len = sizeof sin;
 850         if (!CC->is_local_socket) {
 851                 if (!getpeername(con->client_socket,
 852                    (struct sockaddr *) &sin, &len))
 853                         locate_host(con->cs_host, sizeof con->cs_host, &sin.sin_addr);
 854         }
 855         else {
 856                 strcpy(con->cs_host, "");
 857         }
 858         con->cs_flags = 0;
 859         con->upload_type = UPL_FILE;
 860         con->dl_is_net = 0;
 861         con->FirstSessData = NULL;
 862
 863         con->nologin = 0;
 864         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 865                 con->nologin = 1;
 866
 867         lprintf(3, "Session started.\n");
 868         syslog(LOG_NOTICE,"session %d: ended", con->cs_pid);
 869
 870         /* Run any session startup routines registered by loadable modules */
 871         PerformSessionHooks(EVT_START);
 872 }
 873
 874
 875 void citproto_begin_session() {
 876         if (CC->nologin==1) {
 877                 cprintf("%d %s: Too many users are already online "
 878                         "(maximum is %d)\n",
 879                         ERROR+MAX_SESSIONS_EXCEEDED,
 880                         config.c_nodename, config.c_maxsessions);
 881         }
 882         else {
 883                 cprintf("%d %s Citadel/UX server ready.\n",
 884                         CIT_OK, config.c_nodename);
 885         }
 886 }
 887
 888
 889
 890
 891 /*
 892  * This loop recognizes all server commands.
 893  */
 894 void do_command_loop(void) {
 895         char cmdbuf[SIZ];
 896
 897         time(&CC->lastcmd);
 898         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 899         if (client_gets(cmdbuf) < 1) {
 900                 lprintf(3, "Client socket is broken.  Ending session.\n");
 901                 CC->kill_me = 1;
 902                 return;
 903         }
 904         lprintf(5, "Citadel: %s\n", cmdbuf);
 905
 906         /*
 907          * Let other clients see the last command we executed, and
 908          * update the idle time, but not NOOP, QNOP, PEXP, or GEXP.
 909          */
 910         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 911            && (strncasecmp(cmdbuf, "QNOP", 4))
 912            && (strncasecmp(cmdbuf, "PEXP", 4))
 913            && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
 914                 strcpy(CC->lastcmdname, "    ");
 915                 safestrncpy(CC->lastcmdname, cmdbuf,
 916                         sizeof(CC->lastcmdname) );
 917                 time(&CC->lastidle);
 918         }
 919
 920         if ((strncasecmp(cmdbuf, "ENT0", 4))
 921            && (strncasecmp(cmdbuf, "MESG", 4))
 922            && (strncasecmp(cmdbuf, "MSGS", 4)))
 923         {
 924            CC->cs_flags &= ~CS_POSTING;
 925         }
 926
 927         if (!strncasecmp(cmdbuf,"NOOP",4)) {
 928                 cprintf("%d%cok\n",CIT_OK,CtdlCheckExpress());
 929         }
 930
 931         else if (!strncasecmp(cmdbuf,"QNOP",4)) {
 932                 /* do nothing, this command returns no response */
 933         }
 934
 935         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 936                 cprintf("%d Goodbye.\n",CIT_OK);
 937                 CC->kill_me = 1;
 938         }
 939
 940         else if (!strncasecmp(cmdbuf,"ASYN",4)) {
 941                 cmd_asyn(&cmdbuf[5]);
 942         }
 943
 944         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 945                 if (CC->logged_in) logout(CC);
 946                 cprintf("%d logged out.\n",CIT_OK);
 947         }
 948
 949         else if (!strncasecmp(cmdbuf,"USER",4)) {
 950                 cmd_user(&cmdbuf[5]);
 951         }
 952
 953         else if (!strncasecmp(cmdbuf,"PASS",4)) {
 954                 cmd_pass(&cmdbuf[5]);
 955         }
 956
 957         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 958                 cmd_newu(&cmdbuf[5]);
 959         }
 960
 961         else if (!strncasecmp(cmdbuf,"CREU",4)) {
 962                 cmd_creu(&cmdbuf[5]);
 963         }
 964
 965         else if (!strncasecmp(cmdbuf,"SETP",4)) {
 966                 cmd_setp(&cmdbuf[5]);
 967         }
 968
 969         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 970                 cmd_lrms(&cmdbuf[5]);
 971         }
 972
 973         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
 974                 cmd_lkra(&cmdbuf[5]);
 975         }
 976
 977         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
 978                 cmd_lkrn(&cmdbuf[5]);
 979         }
 980
 981         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
 982                 cmd_lkro(&cmdbuf[5]);
 983         }
 984
 985         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
 986                 cmd_lzrm(&cmdbuf[5]);
 987         }
 988
 989         else if (!strncasecmp(cmdbuf,"LPRM",4)) {
 990                 cmd_lprm(&cmdbuf[5]);
 991         }
 992
 993         else if (!strncasecmp(cmdbuf,"GETU",4)) {
 994                 cmd_getu();
 995         }
 996
 997         else if (!strncasecmp(cmdbuf,"SETU",4)) {
 998                 cmd_setu(&cmdbuf[5]);
 999         }
1000
1001         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
1002                 cmd_goto(&cmdbuf[5]);
1003         }
1004
1005         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
1006                 cmd_msgs(&cmdbuf[5]);
1007         }
1008
1009         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
1010                 cmd_whok();
1011         }
1012
1013         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
1014                 cmd_rdir();
1015         }
1016
1017         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
1018                 cmd_msg0(&cmdbuf[5]);
1019         }
1020
1021         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
1022                 cmd_msg2(&cmdbuf[5]);
1023         }
1024
1025         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
1026                 cmd_msg3(&cmdbuf[5]);
1027         }
1028
1029         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
1030                 cmd_msg4(&cmdbuf[5]);
1031         }
1032
1033         else if (!strncasecmp(cmdbuf,"MSGP",4)) {
1034                 cmd_msgp(&cmdbuf[5]);
1035         }
1036
1037         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
1038                 cmd_opna(&cmdbuf[5]);
1039         }
1040
1041         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1042                 cmd_info();
1043         }
1044
1045         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1046                 cmd_slrp(&cmdbuf[5]);
1047         }
1048
1049         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1050                 cmd_invt_kick(&cmdbuf[5],1);
1051         }
1052
1053         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1054                 cmd_invt_kick(&cmdbuf[5],0);
1055         }
1056
1057         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1058                 cmd_getr();
1059         }
1060
1061         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1062                 cmd_setr(&cmdbuf[5]);
1063         }
1064
1065         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1066                 cmd_geta();
1067         }
1068
1069         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1070                 cmd_seta(&cmdbuf[5]);
1071         }
1072
1073         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1074                 cmd_ent0(&cmdbuf[5]);
1075         }
1076
1077         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1078                 cmd_rinf();
1079         }
1080
1081         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1082                 cmd_dele(&cmdbuf[5]);
1083         }
1084
1085         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1086                 cmd_kill(&cmdbuf[5]);
1087         }
1088
1089         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1090                 cmd_cre8(&cmdbuf[5]);
1091         }
1092
1093         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1094                 cmd_move(&cmdbuf[5]);
1095         }
1096
1097         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1098                 cmd_forg();
1099         }
1100
1101         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1102                 cmd_mesg(&cmdbuf[5]);
1103         }
1104
1105         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1106                 cmd_emsg(&cmdbuf[5]);
1107         }
1108
1109         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1110                 cmd_gnur();
1111         }
1112
1113         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1114                 cmd_vali(&cmdbuf[5]);
1115         }
1116
1117         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1118                 cmd_einf(&cmdbuf[5]);
1119         }
1120
1121         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1122                 cmd_list();
1123         }
1124
1125         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1126                 cmd_chek();
1127         }
1128
1129         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1130                 cmd_delf(&cmdbuf[5]);
1131         }
1132
1133         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1134                 cmd_movf(&cmdbuf[5]);
1135         }
1136
1137         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1138                 cmd_netf(&cmdbuf[5]);
1139         }
1140
1141         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1142                 cmd_open(&cmdbuf[5]);
1143         }
1144
1145         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1146                 cmd_clos();
1147         }
1148
1149         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1150                 cmd_uopn(&cmdbuf[5]);
1151         }
1152
1153         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1154                 cmd_ucls(&cmdbuf[5]);
1155         }
1156
1157         else if (!strncasecmp(cmdbuf,"READ",4)) {
1158                 cmd_read(&cmdbuf[5]);
1159         }
1160
1161         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1162                 cmd_writ(&cmdbuf[5]);
1163         }
1164
1165         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1166                 cmd_qusr(&cmdbuf[5]);
1167         }
1168
1169         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1170                 cmd_echo(&cmdbuf[5]);
1171         }
1172
1173         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1174                 cmd_oimg(&cmdbuf[5]);
1175         }
1176
1177         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1178                 cmd_more();
1179         }
1180
1181         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1182                 cmd_ndop(&cmdbuf[5]);
1183         }
1184
1185         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1186                 cmd_nuop(&cmdbuf[5]);
1187         }
1188
1189         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1190                 cmd_lflr();
1191         }
1192
1193         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1194                 cmd_cflr(&cmdbuf[5]);
1195         }
1196
1197         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1198                 cmd_kflr(&cmdbuf[5]);
1199         }
1200
1201         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1202                 cmd_eflr(&cmdbuf[5]);
1203         }
1204
1205         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1206                 cmd_iden(&cmdbuf[5]);
1207         }
1208
1209         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1210                 cmd_ipgm(&cmdbuf[5]);
1211         }
1212
1213         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1214                 cmd_term(&cmdbuf[5]);
1215         }
1216
1217         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1218                 cmd_down();
1219         }
1220
1221         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1222                 cmd_scdn(&cmdbuf[5]);
1223         }
1224
1225         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1226                 cmd_uimg(&cmdbuf[5]);
1227         }
1228
1229         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1230                 cmd_time();
1231         }
1232
1233         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1234                 cmd_agup(&cmdbuf[5]);
1235         }
1236
1237         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1238                 cmd_asup(&cmdbuf[5]);
1239         }
1240
1241         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1242                 cmd_gpex(&cmdbuf[5]);
1243         }
1244
1245         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1246                 cmd_spex(&cmdbuf[5]);
1247         }
1248
1249         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1250                 cmd_conf(&cmdbuf[5]);
1251         }
1252
1253         else if (!strncasecmp(cmdbuf, "SEEN", 4)) {
1254                 cmd_seen(&cmdbuf[5]);
1255         }
1256
1257         else if (!strncasecmp(cmdbuf, "GTSN", 4)) {
1258                 cmd_gtsn(&cmdbuf[5]);
1259         }
1260
1261         else if (!strncasecmp(cmdbuf, "VIEW", 4)) {
1262                 cmd_view(&cmdbuf[5]);
1263         }
1264
1265         else if (!strncasecmp(cmdbuf, "ISME", 4)) {
1266                 cmd_isme(&cmdbuf[5]);
1267         }
1268
1269 #ifdef DEBUG_MEMORY_LEAKS
1270         else if (!strncasecmp(cmdbuf, "LEAK", 4)) {
1271                 dump_tracked();
1272         }
1273 #endif
1274
1275         else if (!DLoader_Exec_Cmd(cmdbuf)) {
1276                 cprintf("%d Unrecognized or unsupported command.\n", ERROR);
1277                }
1278
1279         /* Run any after-each-command outines registered by modules */
1280         PerformSessionHooks(EVT_CMD);
1281 }