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 time_t server_startup_time;
  69
  70 /*
  71  * Various things that need to be initialized at startup
  72  */
  73 void master_startup(void) {
  74         struct timeval tv;
  75
  76         time(&server_startup_time);
  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, 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         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("1\n"); /* 1 = yes, this system supports the QNOP command */
 337         cprintf("000\n");
 338 }
 339
 340
 341 /*
 342  * returns an asterisk if there are any express messages waiting,
 343  * space otherwise.
 344  */
 345 char CtdlCheckExpress(void) {
 346         if (CC->FirstExpressMessage == NULL) {
 347                 return(' ');
 348         }
 349         else {
 350                 return('*');
 351         }
 352 }
 353
 354 void cmd_time(void)
 355 {
 356    time_t tv;
 357    struct tm *tmp;
 358
 359    tv = time(NULL);
 360    tmp = localtime(&tv);
 361
 362    /* timezone and daylight global variables are not portable. */
 363 #ifdef HAVE_STRUCT_TM_TM_GMTOFF
 364    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, tmp->tm_gmtoff, tmp->tm_isdst);
 365 #else
 366    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, timezone, tmp->tm_isdst);
 367 #endif
 368 }
 369
 370 /*
 371  * Check whether two hostnames match.
 372  * "Realname" should be an actual name of a client that is trying to connect;
 373  * "testname" should be the value we are comparing it with. The idea is that we
 374  * want to compare with both the abbreviated and fully-qualified versions of
 375  * "testname;" some people define "localhost" as "localhost.foo.com," etc.
 376  */
 377 static int hostnames_match(const char *realname, const char *testname) {
 378         struct hostent *he;
 379         int retval = 0;
 380
 381         if (!strcasecmp(realname, testname)) {
 382                 return(1);
 383         }
 384
 385 #ifdef HAVE_NONREENTRANT_NETDB
 386         begin_critical_section(S_NETDB);
 387 #endif
 388
 389         if ((he = gethostbyname(testname)) != NULL) {
 390                 if (!strcasecmp(realname, he->h_name)) {
 391                         retval = 1;
 392                 }
 393         }
 394
 395 #ifdef HAVE_NONREENTRANT_NETDB
 396         end_critical_section(S_NETDB);
 397 #endif
 398
 399         return retval;
 400 }
 401
 402 /*
 403  * check a hostname against the public_clients file
 404  */
 405 int is_public_client(char *where)
 406 {
 407         char buf[SIZ];
 408         FILE *fp;
 409
 410         lprintf(9, "Checking whether %s is a public client\n", where);
 411
 412         if (hostnames_match(where, "localhost")) return(1);
 413         if (hostnames_match(where, config.c_fqdn)) return(1);
 414
 415         fp = fopen("public_clients","r");
 416         if (fp == NULL) return(0);
 417
 418         while (fgets(buf, sizeof buf, fp)!=NULL) {
 419                 while (isspace((buf[strlen(buf)-1])))
 420                         buf[strlen(buf)-1] = 0;
 421                 if (hostnames_match(where,buf)) {
 422                         fclose(fp);
 423                         return(1);
 424                 }
 425         }
 426
 427         fclose(fp);
 428         return(0);
 429 }
 430
 431
 432 /*
 433  * the client is identifying itself to the server
 434  */
 435 void cmd_iden(char *argbuf)
 436 {
 437         int dev_code;
 438         int cli_code;
 439         int rev_level;
 440         char desc[SIZ];
 441         char from_host[SIZ];
 442         struct in_addr addr;
 443         int do_lookup = 0;
 444
 445         if (num_parms(argbuf)<4) {
 446                 cprintf("%d usage error\n",ERROR);
 447                 return;
 448         }
 449
 450         dev_code = extract_int(argbuf,0);
 451         cli_code = extract_int(argbuf,1);
 452         rev_level = extract_int(argbuf,2);
 453         extract(desc,argbuf,3);
 454
 455         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 456         from_host[sizeof from_host - 1] = 0;
 457         if (num_parms(argbuf)>=5) extract(from_host,argbuf,4);
 458
 459         CC->cs_clientdev = dev_code;
 460         CC->cs_clienttyp = cli_code;
 461         CC->cs_clientver = rev_level;
 462         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 463         CC->cs_clientname[31] = 0;
 464
 465         if (strlen(from_host) > 0) {
 466                 if (CC->is_local_socket) do_lookup = 1;
 467                 else if (is_public_client(CC->cs_host)) do_lookup = 1;
 468         }
 469
 470         if (do_lookup) {
 471                 lprintf(9, "Looking up hostname '%s'\n", from_host);
 472                 if ((addr.s_addr = inet_addr(from_host)) != -1) {
 473                         locate_host(CC->cs_host, sizeof CC->cs_host, &addr);
 474                 }
 475                 else {
 476                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 477                         CC->cs_host[sizeof CC->cs_host - 1] = 0;
 478                 }
 479         }
 480
 481         lprintf(7, "client %d/%d/%01d.%02d (%s)\n",
 482                 dev_code,
 483                 cli_code,
 484                 (rev_level / 100),
 485                 (rev_level % 100),
 486                 desc);
 487
 488         syslog(LOG_NOTICE,"session %d: client %d/%d/%01d.%02d (%s) from %s\n",
 489                 CC->cs_pid,
 490                 dev_code,
 491                 cli_code,
 492                 (rev_level / 100),
 493                 (rev_level % 100),
 494                 desc,
 495                 CC->cs_host);
 496         cprintf("%d Ok\n",CIT_OK);
 497 }
 498
 499
 500 /*
 501  * display system messages or help
 502  */
 503 void cmd_mesg(char *mname)
 504 {
 505         FILE *mfp;
 506         char targ[SIZ];
 507         char buf[SIZ];
 508         char *dirs[2];
 509
 510         extract(buf,mname,0);
 511
 512
 513         dirs[0]=mallok(64);
 514         dirs[1]=mallok(64);
 515         strcpy(dirs[0],"messages");
 516         strcpy(dirs[1],"help");
 517         mesg_locate(targ,sizeof targ,buf,2,(const char **)dirs);
 518         phree(dirs[0]);
 519         phree(dirs[1]);
 520
 521
 522         if (strlen(targ)==0) {
 523                 cprintf("%d '%s' not found.\n",ERROR,mname);
 524                 return;
 525         }
 526
 527         mfp = fopen(targ,"r");
 528         if (mfp==NULL) {
 529                 cprintf("%d Cannot open '%s': %s\n",
 530                         ERROR,targ,strerror(errno));
 531                 return;
 532         }
 533         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
 534
 535         while (fgets(buf, (SIZ-1), mfp)!=NULL) {
 536                 buf[strlen(buf)-1] = 0;
 537                 do_help_subst(buf);
 538                 cprintf("%s\n",buf);
 539         }
 540
 541         fclose(mfp);
 542         cprintf("000\n");
 543 }
 544
 545
 546 /*
 547  * enter system messages or help
 548  */
 549 void cmd_emsg(char *mname)
 550 {
 551         FILE *mfp;
 552         char targ[SIZ];
 553         char buf[SIZ];
 554         char *dirs[2];
 555         int a;
 556
 557         if (CtdlAccessCheck(ac_aide)) return;
 558
 559         extract(buf,mname,0);
 560         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 561                 if (buf[a] == '/') buf[a] = '.';
 562         }
 563
 564         dirs[0]=mallok(64);
 565         dirs[1]=mallok(64);
 566         strcpy(dirs[0],"messages");
 567         strcpy(dirs[1],"help");
 568         mesg_locate(targ,sizeof targ,buf,2,(const char**)dirs);
 569         phree(dirs[0]);
 570         phree(dirs[1]);
 571
 572         if (strlen(targ)==0) {
 573                 snprintf(targ, sizeof targ, "./help/%s", buf);
 574         }
 575
 576         mfp = fopen(targ,"w");
 577         if (mfp==NULL) {
 578                 cprintf("%d Cannot open '%s': %s\n",
 579                         ERROR,targ,strerror(errno));
 580                 return;
 581         }
 582         cprintf("%d %s\n", SEND_LISTING, targ);
 583
 584         while (client_gets(buf), strcmp(buf, "000")) {
 585                 fprintf(mfp, "%s\n", buf);
 586         }
 587
 588         fclose(mfp);
 589 }
 590
 591
 592 /* Don't show the names of private rooms unless the viewing
 593  * user also knows the rooms.
 594  */
 595 void GenerateRoomDisplay(char *real_room,
 596                         struct CitContext *viewed,
 597                         struct CitContext *viewer) {
 598
 599         strcpy(real_room, viewed->quickroom.QRname);
 600         if (viewed->quickroom.QRflags & QR_MAILBOX) {
 601                 strcpy(real_room, &real_room[11]);
 602         }
 603         if (viewed->quickroom.QRflags & QR_PRIVATE) {
 604                 if ( (CtdlRoomAccess(&viewed->quickroom, &viewer->usersupp)
 605                    & UA_KNOWN) == 0) {
 606                         strcpy(real_room, "<private room>");
 607                 }
 608         }
 609
 610         if (viewed->cs_flags & CS_CHAT) {
 611                 while (strlen(real_room) < 14)
 612                         strcat(real_room, " ");
 613
 614                 strcpy(&real_room[14], "<chat>");
 615         }
 616
 617 }
 618
 619 /*
 620  * Convenience function.
 621  */
 622 int CtdlAccessCheck(int required_level) {
 623
 624         if (CC->internal_pgm) return(0);
 625         if (required_level >= ac_internal) {
 626                 cprintf("%d This is not a user-level command.\n",
 627                         ERROR+HIGHER_ACCESS_REQUIRED);
 628                 return(-1);
 629         }
 630
 631         if (CC->usersupp.axlevel >= 6) return(0);
 632         if (required_level >= ac_aide) {
 633                 cprintf("%d This command requires Aide access.\n",
 634                         ERROR+HIGHER_ACCESS_REQUIRED);
 635                 return(-1);
 636         }
 637
 638         if (is_room_aide()) return(0);
 639         if (required_level >= ac_room_aide) {
 640                 cprintf("%d This command requires Aide or Room Aide access.\n",
 641                         ERROR + HIGHER_ACCESS_REQUIRED);
 642                 return(-1);
 643         }
 644
 645         if (CC->logged_in) return(0);
 646         if (required_level >= ac_logged_in) {
 647                 cprintf("%d Not logged in.\n", ERROR+NOT_LOGGED_IN);
 648                 return(-1);
 649         }
 650
 651         /* shhh ... succeed quietly */
 652         return(0);
 653 }
 654
 655
 656
 657 /*
 658  * Terminate another running session
 659  */
 660 void cmd_term(char *cmdbuf)
 661 {
 662         int session_num;
 663         struct CitContext *ccptr;
 664         int found_it = 0;
 665         int allowed = 0;
 666
 667         session_num = extract_int(cmdbuf, 0);
 668         if (session_num == CC->cs_pid) {
 669                 cprintf("%d You can't kill your own session.\n", ERROR);
 670                 return;
 671         }
 672
 673         lprintf(9, "Locating session to kill\n");
 674         begin_critical_section(S_SESSION_TABLE);
 675         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 676                 if (session_num == ccptr->cs_pid) {
 677                         found_it = 1;
 678                         if ((ccptr->usersupp.usernum == CC->usersupp.usernum)
 679                            || (CC->usersupp.axlevel >= 6)) {
 680                                 allowed = 1;
 681                                 ccptr->kill_me = 1;
 682                         }
 683                         else {
 684                                 allowed = 0;
 685                         }
 686                 }
 687         }
 688         end_critical_section(S_SESSION_TABLE);
 689
 690         if (found_it) {
 691                 if (allowed) {
 692                         cprintf("%d Session terminated.\n", CIT_OK);
 693                 }
 694                 else {
 695                         cprintf("%d You are not allowed to do that.\n",
 696                                 ERROR + HIGHER_ACCESS_REQUIRED);
 697                 }
 698         }
 699         else {
 700                 cprintf("%d No such session.\n", ERROR);
 701         }
 702 }
 703
 704
 705
 706
 707
 708 /*
 709  * get the paginator prompt
 710  */
 711 void cmd_more(void) {
 712         cprintf("%d %s\n", CIT_OK, config.c_moreprompt);
 713 }
 714
 715 /*
 716  * echo
 717  */
 718 void cmd_echo(char *etext)
 719 {
 720         cprintf("%d %s\n", CIT_OK, etext);
 721 }
 722
 723
 724
 725 /*
 726  * identify as internal program
 727  */
 728 void cmd_ipgm(char *argbuf)
 729 {
 730         int secret;
 731
 732         secret = extract_int(argbuf, 0);
 733         if (secret == config.c_ipgm_secret) {
 734                 CC->internal_pgm = 1;
 735                 strcpy(CC->curr_user, "<internal program>");
 736                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 737                 cprintf("%d Authenticated as an internal program.\n",CIT_OK);
 738         }
 739         else {
 740                 cprintf("%d Authentication failed.\n",ERROR);
 741                 lprintf(3, "Warning: ipgm authentication failed.\n");
 742         }
 743 }
 744
 745
 746 /*
 747  * Shut down the server
 748  */
 749 void cmd_down(void) {
 750
 751         if (CtdlAccessCheck(ac_aide)) return;
 752
 753         cprintf("%d Shutting down server.  Goodbye.\n", CIT_OK);
 754         time_to_die = 1;
 755 }
 756
 757 /*
 758  * Schedule or cancel a server shutdown
 759  */
 760 void cmd_scdn(char *argbuf)
 761 {
 762         int new_state;
 763
 764         if (CtdlAccessCheck(ac_aide)) return;
 765
 766         new_state = extract_int(argbuf, 0);
 767         if ((new_state == 0) || (new_state == 1)) {
 768                 ScheduledShutdown = new_state;
 769         }
 770         cprintf("%d %d\n", CIT_OK, ScheduledShutdown);
 771 }
 772
 773
 774 /*
 775  * Set or unset asynchronous protocol mode
 776  */
 777 void cmd_asyn(char *argbuf)
 778 {
 779         int new_state;
 780
 781         new_state = extract_int(argbuf, 0);
 782         if ((new_state == 0) || (new_state == 1)) {
 783                 CC->is_async = new_state;
 784         }
 785         cprintf("%d %d\n", CIT_OK, CC->is_async);
 786 }
 787
 788
 789 /*
 790  * Generate a "nonce" for APOP-style authentication.
 791  *
 792  * RFC 1725 et al specify a PID to be placed in front of the nonce.
 793  * Quoth BTX: That would be stupid.
 794  */
 795 void generate_nonce(struct CitContext *con) {
 796         struct timeval tv;
 797
 798         memset(con->cs_nonce, NONCE_SIZE, 0);
 799         gettimeofday(&tv, NULL);
 800         memset(con->cs_nonce, NONCE_SIZE, 0);
 801         snprintf(con->cs_nonce, NONCE_SIZE, "<%d%ld@%s>",
 802                 rand(), (long)tv.tv_usec, config.c_fqdn);
 803 }
 804
 805
 806
 807
 808 /*
 809  * Back-end function for starting a session
 810  */
 811 void begin_session(struct CitContext *con)
 812 {
 813         int len;
 814         struct sockaddr_in sin;
 815
 816         /*
 817          * Initialize some variables specific to our context.
 818          */
 819         con->logged_in = 0;
 820         con->internal_pgm = 0;
 821         con->download_fp = NULL;
 822         con->upload_fp = NULL;
 823         con->FirstExpressMessage = NULL;
 824         time(&con->lastcmd);
 825         time(&con->lastidle);
 826         strcpy(con->lastcmdname, "    ");
 827         strcpy(con->cs_clientname, "(unknown)");
 828         strcpy(con->curr_user, NLI);
 829         strcpy(con->net_node,"");
 830         strcpy(con->fake_username, "");
 831         strcpy(con->fake_postname, "");
 832         strcpy(con->fake_hostname, "");
 833         strcpy(con->fake_roomname, "");
 834         generate_nonce(con);
 835         snprintf(con->temp, sizeof con->temp, tmpnam(NULL));
 836         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 837         con->cs_host[sizeof con->cs_host - 1] = 0;
 838         len = sizeof sin;
 839         if (!CC->is_local_socket) {
 840                 if (!getpeername(con->client_socket,
 841                    (struct sockaddr *) &sin, &len))
 842                         locate_host(con->cs_host, sizeof con->cs_host, &sin.sin_addr);
 843         }
 844         else {
 845                 strcpy(con->cs_host, "");
 846         }
 847         con->cs_flags = 0;
 848         con->upload_type = UPL_FILE;
 849         con->dl_is_net = 0;
 850         con->FirstSessData = NULL;
 851
 852         con->nologin = 0;
 853         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 854                 con->nologin = 1;
 855
 856         lprintf(3, "Session started.\n");
 857
 858         /* Run any session startup routines registered by loadable modules */
 859         PerformSessionHooks(EVT_START);
 860
 861         rec_log(CL_CONNECT, "");
 862 }
 863
 864
 865 void citproto_begin_session() {
 866         if (CC->nologin==1) {
 867                 cprintf("%d %s: Too many users are already online "
 868                         "(maximum is %d)\n",
 869                         ERROR+MAX_SESSIONS_EXCEEDED,
 870                         config.c_nodename, config.c_maxsessions);
 871         }
 872         else {
 873                 cprintf("%d %s Citadel/UX server ready.\n",
 874                         CIT_OK, config.c_nodename);
 875         }
 876 }
 877
 878
 879
 880
 881 /*
 882  * This loop recognizes all server commands.
 883  */
 884 void do_command_loop(void) {
 885         char cmdbuf[SIZ];
 886
 887         time(&CC->lastcmd);
 888         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 889         if (client_gets(cmdbuf) < 1) {
 890                 lprintf(3, "Client socket is broken.  Ending session.\n");
 891                 CC->kill_me = 1;
 892                 return;
 893         }
 894         lprintf(5, "Citadel: %s\n", cmdbuf);
 895
 896         /*
 897          * Let other clients see the last command we executed, and
 898          * update the idle time, but not NOOP, QNOP, PEXP, or GEXP.
 899          */
 900         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 901            && (strncasecmp(cmdbuf, "QNOP", 4))
 902            && (strncasecmp(cmdbuf, "PEXP", 4))
 903            && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
 904                 strcpy(CC->lastcmdname, "    ");
 905                 safestrncpy(CC->lastcmdname, cmdbuf,
 906                         sizeof(CC->lastcmdname) );
 907                 time(&CC->lastidle);
 908         }
 909
 910         if ((strncasecmp(cmdbuf, "ENT0", 4))
 911            && (strncasecmp(cmdbuf, "MESG", 4))
 912            && (strncasecmp(cmdbuf, "MSGS", 4)))
 913         {
 914            CC->cs_flags &= ~CS_POSTING;
 915         }
 916
 917         if (!strncasecmp(cmdbuf,"NOOP",4)) {
 918                 cprintf("%d%cok\n",CIT_OK,CtdlCheckExpress());
 919         }
 920
 921         else if (!strncasecmp(cmdbuf,"QNOP",4)) {
 922                 /* do nothing, this command returns no response */
 923         }
 924
 925         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 926                 cprintf("%d Goodbye.\n",CIT_OK);
 927                 CC->kill_me = 1;
 928         }
 929
 930         else if (!strncasecmp(cmdbuf,"ASYN",4)) {
 931                 cmd_asyn(&cmdbuf[5]);
 932         }
 933
 934         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 935                 if (CC->logged_in) logout(CC);
 936                 cprintf("%d logged out.\n",CIT_OK);
 937         }
 938
 939         else if (!strncasecmp(cmdbuf,"USER",4)) {
 940                 cmd_user(&cmdbuf[5]);
 941         }
 942
 943         else if (!strncasecmp(cmdbuf,"PASS",4)) {
 944                 cmd_pass(&cmdbuf[5]);
 945         }
 946
 947         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 948                 cmd_newu(&cmdbuf[5]);
 949         }
 950
 951         else if (!strncasecmp(cmdbuf,"CREU",4)) {
 952                 cmd_creu(&cmdbuf[5]);
 953         }
 954
 955         else if (!strncasecmp(cmdbuf,"SETP",4)) {
 956                 cmd_setp(&cmdbuf[5]);
 957         }
 958
 959         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 960                 cmd_lrms(&cmdbuf[5]);
 961         }
 962
 963         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
 964                 cmd_lkra(&cmdbuf[5]);
 965         }
 966
 967         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
 968                 cmd_lkrn(&cmdbuf[5]);
 969         }
 970
 971         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
 972                 cmd_lkro(&cmdbuf[5]);
 973         }
 974
 975         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
 976                 cmd_lzrm(&cmdbuf[5]);
 977         }
 978
 979         else if (!strncasecmp(cmdbuf,"GETU",4)) {
 980                 cmd_getu();
 981         }
 982
 983         else if (!strncasecmp(cmdbuf,"SETU",4)) {
 984                 cmd_setu(&cmdbuf[5]);
 985         }
 986
 987         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
 988                 cmd_goto(&cmdbuf[5]);
 989         }
 990
 991         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
 992                 cmd_msgs(&cmdbuf[5]);
 993         }
 994
 995         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
 996                 cmd_whok();
 997         }
 998
 999         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
1000                 cmd_rdir();
1001         }
1002
1003         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
1004                 cmd_msg0(&cmdbuf[5]);
1005         }
1006
1007         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
1008                 cmd_msg2(&cmdbuf[5]);
1009         }
1010
1011         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
1012                 cmd_msg3(&cmdbuf[5]);
1013         }
1014
1015         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
1016                 cmd_msg4(&cmdbuf[5]);
1017         }
1018
1019         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
1020                 cmd_opna(&cmdbuf[5]);
1021         }
1022
1023         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1024                 cmd_info();
1025         }
1026
1027         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1028                 cmd_slrp(&cmdbuf[5]);
1029         }
1030
1031         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1032                 cmd_invt_kick(&cmdbuf[5],1);
1033         }
1034
1035         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1036                 cmd_invt_kick(&cmdbuf[5],0);
1037         }
1038
1039         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1040                 cmd_getr();
1041         }
1042
1043         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1044                 cmd_setr(&cmdbuf[5]);
1045         }
1046
1047         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1048                 cmd_geta();
1049         }
1050
1051         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1052                 cmd_seta(&cmdbuf[5]);
1053         }
1054
1055         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1056                 cmd_ent0(&cmdbuf[5]);
1057         }
1058
1059         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1060                 cmd_rinf();
1061         }
1062
1063         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1064                 cmd_dele(&cmdbuf[5]);
1065         }
1066
1067         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1068                 cmd_kill(&cmdbuf[5]);
1069         }
1070
1071         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1072                 cmd_cre8(&cmdbuf[5]);
1073         }
1074
1075         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1076                 cmd_move(&cmdbuf[5]);
1077         }
1078
1079         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1080                 cmd_forg();
1081         }
1082
1083         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1084                 cmd_mesg(&cmdbuf[5]);
1085         }
1086
1087         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1088                 cmd_emsg(&cmdbuf[5]);
1089         }
1090
1091         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1092                 cmd_gnur();
1093         }
1094
1095         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1096                 cmd_vali(&cmdbuf[5]);
1097         }
1098
1099         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1100                 cmd_einf(&cmdbuf[5]);
1101         }
1102
1103         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1104                 cmd_list();
1105         }
1106
1107         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1108                 cmd_chek();
1109         }
1110
1111         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1112                 cmd_delf(&cmdbuf[5]);
1113         }
1114
1115         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1116                 cmd_movf(&cmdbuf[5]);
1117         }
1118
1119         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1120                 cmd_netf(&cmdbuf[5]);
1121         }
1122
1123         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1124                 cmd_open(&cmdbuf[5]);
1125         }
1126
1127         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1128                 cmd_clos();
1129         }
1130
1131         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1132                 cmd_uopn(&cmdbuf[5]);
1133         }
1134
1135         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1136                 cmd_ucls(&cmdbuf[5]);
1137         }
1138
1139         else if (!strncasecmp(cmdbuf,"READ",4)) {
1140                 cmd_read(&cmdbuf[5]);
1141         }
1142
1143         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1144                 cmd_writ(&cmdbuf[5]);
1145         }
1146
1147         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1148                 cmd_qusr(&cmdbuf[5]);
1149         }
1150
1151         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1152                 cmd_echo(&cmdbuf[5]);
1153         }
1154
1155         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1156                 cmd_oimg(&cmdbuf[5]);
1157         }
1158
1159         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1160                 cmd_more();
1161         }
1162
1163         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1164                 cmd_ndop(&cmdbuf[5]);
1165         }
1166
1167         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1168                 cmd_nuop(&cmdbuf[5]);
1169         }
1170
1171         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1172                 cmd_lflr();
1173         }
1174
1175         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1176                 cmd_cflr(&cmdbuf[5]);
1177         }
1178
1179         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1180                 cmd_kflr(&cmdbuf[5]);
1181         }
1182
1183         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1184                 cmd_eflr(&cmdbuf[5]);
1185         }
1186
1187         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1188                 cmd_iden(&cmdbuf[5]);
1189         }
1190
1191         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1192                 cmd_ipgm(&cmdbuf[5]);
1193         }
1194
1195         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1196                 cmd_term(&cmdbuf[5]);
1197         }
1198
1199         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1200                 cmd_down();
1201         }
1202
1203         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1204                 cmd_scdn(&cmdbuf[5]);
1205         }
1206
1207         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1208                 cmd_uimg(&cmdbuf[5]);
1209         }
1210
1211         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1212                 cmd_time();
1213         }
1214
1215         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1216                 cmd_agup(&cmdbuf[5]);
1217         }
1218
1219         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1220                 cmd_asup(&cmdbuf[5]);
1221         }
1222
1223         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1224                 cmd_gpex(&cmdbuf[5]);
1225         }
1226
1227         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1228                 cmd_spex(&cmdbuf[5]);
1229         }
1230
1231         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1232                 cmd_conf(&cmdbuf[5]);
1233         }
1234
1235         else if (!strncasecmp(cmdbuf, "SEEN", 4)) {
1236                 cmd_seen(&cmdbuf[5]);
1237         }
1238
1239         else if (!strncasecmp(cmdbuf, "GTSN", 4)) {
1240                 cmd_gtsn(&cmdbuf[5]);
1241         }
1242
1243         else if (!strncasecmp(cmdbuf, "VIEW", 4)) {
1244                 cmd_view(&cmdbuf[5]);
1245         }
1246
1247 #ifdef DEBUG_MEMORY_LEAKS
1248         else if (!strncasecmp(cmdbuf, "LEAK", 4)) {
1249                 dump_tracked();
1250         }
1251 #endif
1252
1253         else if (!DLoader_Exec_Cmd(cmdbuf)) {
1254                 cprintf("%d Unrecognized or unsupported command.\n", ERROR);
1255                }
1256
1257         /* Run any after-each-command outines registered by modules */
1258         PerformSessionHooks(EVT_CMD);
1259 }