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 "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         struct quickroom qrbuf;
  76
  77         lprintf(9, "master_startup() started\n");
  78         time(&server_startup_time);
  79
  80         lprintf(7, "Opening databases\n");
  81         open_databases();
  82
  83         if (do_defrag) {
  84                 defrag_databases();
  85         }
  86
  87         check_ref_counts();
  88
  89         lprintf(7, "Creating base rooms (if necessary)\n");
  90         create_room(BASEROOM,           0, "", 0, 1, 0);
  91         create_room(AIDEROOM,           3, "", 0, 1, 0);
  92         create_room(SYSCONFIGROOM,      3, "", 0, 1, 0);
  93         create_room(config.c_twitroom,  0, "", 0, 1, 0);
  94
  95         /* The "Local System Configuration" room doesn't need to be visible */
  96         if (lgetroom(&qrbuf, SYSCONFIGROOM) == 0) {
  97                 qrbuf.QRflags2 |= QR2_SYSTEM;
  98                 lputroom(&qrbuf);
  99         }
 100
 101
 102         lprintf(7, "Seeding the pseudo-random number generator...\n");
 103         gettimeofday(&tv, NULL);
 104         srand(tv.tv_usec);
 105         lprintf(9, "master_startup() finished\n");
 106 }
 107
 108
 109
 110 /*
 111  * Cleanup routine to be called when the server is shutting down.
 112  * WARNING: It's no longer safe to call this function to force a shutdown.
 113  * Instead, set time_to_die = 1.
 114  */
 115 void master_cleanup(void) {
 116         struct CleanupFunctionHook *fcn;
 117
 118         /* Run any cleanup routines registered by loadable modules */
 119         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
 120                 (*fcn->h_function_pointer)();
 121         }
 122
 123         /* Close databases */
 124         lprintf(7, "Closing databases\n");
 125         close_databases();
 126
 127         /* Do system-dependent stuff */
 128         sysdep_master_cleanup();
 129
 130         /* Now go away. */
 131         lprintf(3, "citserver: exiting.\n");
 132         fflush(stdout); fflush(stderr);
 133         exit(0);
 134 }
 135
 136
 137 /*
 138  * Free any per-session data allocated by modules or whatever
 139  */
 140 void deallocate_user_data(struct CitContext *con)
 141 {
 142         struct CtdlSessData *ptr;
 143
 144         begin_critical_section(S_SESSION_TABLE);
 145         while (con->FirstSessData != NULL) {
 146                 lprintf(9, "Deallocating user data symbol %ld\n",
 147                         con->FirstSessData->sym_id);
 148                 if (con->FirstSessData->sym_data != NULL)
 149                         phree(con->FirstSessData->sym_data);
 150                 ptr = con->FirstSessData->next;
 151                 phree(con->FirstSessData);
 152                 con->FirstSessData = ptr;
 153         }
 154         end_critical_section(S_SESSION_TABLE);
 155 }
 156
 157
 158
 159
 160 /*
 161  * Terminate a session and remove its context data structure.
 162  */
 163 void RemoveContext (struct CitContext *con)
 164 {
 165         struct CitContext *ptr = NULL;
 166         struct CitContext *ToFree = NULL;
 167
 168         lprintf(9, "RemoveContext() called\n");
 169         if (con==NULL) {
 170                 lprintf(5, "WARNING: RemoveContext() called with NULL!\n");
 171                 return;
 172         }
 173
 174         /* Remove the context from the global context list.  This needs
 175          * to get done FIRST to avoid concurrency problems.  It is *vitally*
 176          * important to keep num_sessions accurate!!
 177          */
 178         lprintf(7, "Removing context for session %d\n", con->cs_pid);
 179         begin_critical_section(S_SESSION_TABLE);
 180         if (ContextList == con) {
 181                 ToFree = ContextList;
 182                 ContextList = ContextList->next;
 183                 --num_sessions;
 184         }
 185         else {
 186                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
 187                         if (ptr->next == con) {
 188                                 ToFree = ptr->next;
 189                                 ptr->next = ptr->next->next;
 190                                 --num_sessions;
 191                         }
 192                 }
 193         }
 194         end_critical_section(S_SESSION_TABLE);
 195
 196         if (ToFree == NULL) {
 197                 lprintf(9, "RemoveContext() found nothing to remove\n");
 198                 return;
 199         }
 200
 201         /* Run any cleanup routines registered by loadable modules.
 202          * Note 1: This must occur *before* deallocate_user_data() because the
 203          *         cleanup functions might touch dynamic session data.
 204          * Note 2: We have to "become_session()" because the cleanup functions
 205          *         might make references to "CC" assuming it's the right one.
 206          */
 207         become_session(con);
 208         PerformSessionHooks(EVT_STOP);
 209         become_session(NULL);
 210
 211         /* Now handle all of the administrivia. */
 212         lprintf(7, "Calling logout(%d)\n", con->cs_pid);
 213         logout(con);
 214
 215         rec_log(CL_TERMINATE, con->curr_user);
 216         unlink(con->temp);
 217         lprintf(3, "[%3d] Session ended.\n", con->cs_pid);
 218
 219         syslog(LOG_NOTICE,"session %d: ended", con->cs_pid);
 220
 221         /* Deallocate any user-data attached to this session */
 222         deallocate_user_data(con);
 223
 224         /* If the client is still connected, blow 'em away. */
 225         lprintf(7, "Closing socket %d\n", con->client_socket);
 226         close(con->client_socket);
 227
 228         /* This is where we used to check for scheduled shutdowns. */
 229
 230         /* Free up the memory used by this context */
 231         phree(con);
 232
 233         lprintf(7, "Done with RemoveContext()\n");
 234 }
 235
 236
 237
 238 /*
 239  * Get a dynamic symbol number for per-session user data.
 240  * This API call should be made only ONCE per symbol per citserver run.
 241  */
 242 int CtdlGetDynamicSymbol()
 243 {
 244         static unsigned int next_symbol = SYM_MAX;
 245         return ++next_symbol;
 246 }
 247
 248
 249
 250 /*
 251  * Return a pointer to some generic per-session user data.
 252  * (This function returns NULL if the requested symbol is not allocated.)
 253  *
 254  * NOTE: we use critical sections for allocating and de-allocating these,
 255  *       but not for locating one.
 256  */
 257 void *CtdlGetUserData(unsigned long requested_sym)
 258 {
 259         struct CtdlSessData *ptr;
 260
 261         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)
 262                 if (ptr->sym_id == requested_sym)
 263                         return(ptr->sym_data);
 264
 265         lprintf(2, "ERROR! CtdlGetUserData(%ld) symbol not allocated\n",
 266                 requested_sym);
 267         return NULL;
 268 }
 269
 270
 271 /*
 272  * Allocate some generic per-session user data.
 273  */
 274 void CtdlAllocUserData(unsigned long requested_sym, size_t num_bytes)
 275 {
 276         struct CtdlSessData *ptr;
 277
 278         lprintf(9, "CtdlAllocUserData(%ld) called\n", requested_sym);
 279
 280         /* Fail silently if the symbol is already registered. */
 281         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 282                 if (ptr->sym_id == requested_sym) {
 283                         return;
 284                 }
 285         }
 286
 287         /* Grab us some memory!  Dem's good eatin' !!  */
 288         ptr = mallok(sizeof(struct CtdlSessData));
 289         ptr->sym_id = requested_sym;
 290         ptr->sym_data = mallok(num_bytes);
 291         memset(ptr->sym_data, 0, num_bytes);
 292
 293         begin_critical_section(S_SESSION_TABLE);
 294         ptr->next = CC->FirstSessData;
 295         CC->FirstSessData = ptr;
 296         end_critical_section(S_SESSION_TABLE);
 297
 298         lprintf(9, "CtdlAllocUserData(%ld) finished\n", requested_sym);
 299 }
 300
 301
 302 /*
 303  * Change the size of a buffer allocated with CtdlAllocUserData()
 304  */
 305 void CtdlReallocUserData(unsigned long requested_sym, size_t num_bytes)
 306 {
 307         struct CtdlSessData *ptr;
 308
 309         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 310                 if (ptr->sym_id == requested_sym) {
 311                         ptr->sym_data = reallok(ptr->sym_data, num_bytes);
 312                         return;
 313                 }
 314         }
 315
 316         lprintf(2, "CtdlReallocUserData() ERROR: symbol %ld not found!\n",
 317                 requested_sym);
 318 }
 319
 320
 321
 322
 323
 324
 325 /*
 326  * cmd_info()  -  tell the client about this server
 327  */
 328 void cmd_info(void) {
 329         cprintf("%d Server info:\n", LISTING_FOLLOWS);
 330         cprintf("%d\n", CC->cs_pid);
 331         cprintf("%s\n", config.c_nodename);
 332         cprintf("%s\n", config.c_humannode);
 333         cprintf("%s\n", config.c_fqdn);
 334         cprintf("%s\n", CITADEL);
 335         cprintf("%d\n", REV_LEVEL);
 336         cprintf("%s\n", config.c_bbs_city);
 337         cprintf("%s\n", config.c_sysadm);
 338         cprintf("%d\n", SERVER_TYPE);
 339         cprintf("%s\n", config.c_moreprompt);
 340         cprintf("1\n"); /* 1 = yes, this system supports floors */
 341         cprintf("1\n"); /* 1 = we support the extended paging options */
 342         cprintf("%s\n", CC->cs_nonce);
 343         cprintf("1\n"); /* 1 = yes, this system supports the QNOP command */
 344         cprintf("000\n");
 345 }
 346
 347
 348 /*
 349  * returns an asterisk if there are any express messages waiting,
 350  * space otherwise.
 351  */
 352 char CtdlCheckExpress(void) {
 353         if (CC->FirstExpressMessage == NULL) {
 354                 return(' ');
 355         }
 356         else {
 357                 return('*');
 358         }
 359 }
 360
 361 void cmd_time(void)
 362 {
 363    time_t tv;
 364    struct tm *tmp;
 365
 366    tv = time(NULL);
 367    tmp = localtime(&tv);
 368
 369    /* timezone and daylight global variables are not portable. */
 370 #ifdef HAVE_STRUCT_TM_TM_GMTOFF
 371    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, tmp->tm_gmtoff, tmp->tm_isdst);
 372 #else
 373    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, timezone, tmp->tm_isdst);
 374 #endif
 375 }
 376
 377 /*
 378  * Check whether two hostnames match.
 379  * "Realname" should be an actual name of a client that is trying to connect;
 380  * "testname" should be the value we are comparing it with. The idea is that we
 381  * want to compare with both the abbreviated and fully-qualified versions of
 382  * "testname;" some people define "localhost" as "localhost.foo.com," etc.
 383  */
 384 static int hostnames_match(const char *realname, const char *testname) {
 385         struct hostent *he;
 386         int retval = 0;
 387
 388         if (!strcasecmp(realname, testname)) {
 389                 return(1);
 390         }
 391
 392 #ifdef HAVE_NONREENTRANT_NETDB
 393         begin_critical_section(S_NETDB);
 394 #endif
 395
 396         if ((he = gethostbyname(testname)) != NULL) {
 397                 if (!strcasecmp(realname, he->h_name)) {
 398                         retval = 1;
 399                 }
 400         }
 401
 402 #ifdef HAVE_NONREENTRANT_NETDB
 403         end_critical_section(S_NETDB);
 404 #endif
 405
 406         return retval;
 407 }
 408
 409 /*
 410  * check a hostname against the public_clients file
 411  */
 412 int is_public_client(char *where)
 413 {
 414         char buf[SIZ];
 415         FILE *fp;
 416
 417         lprintf(9, "Checking whether %s is a public client\n", where);
 418
 419         if (hostnames_match(where, "localhost")) return(1);
 420         if (hostnames_match(where, config.c_fqdn)) return(1);
 421
 422         fp = fopen("public_clients","r");
 423         if (fp == NULL) return(0);
 424
 425         while (fgets(buf, sizeof buf, fp)!=NULL) {
 426                 while (isspace((buf[strlen(buf)-1])))
 427                         buf[strlen(buf)-1] = 0;
 428                 if (hostnames_match(where,buf)) {
 429                         fclose(fp);
 430                         return(1);
 431                 }
 432         }
 433
 434         fclose(fp);
 435         return(0);
 436 }
 437
 438
 439 /*
 440  * the client is identifying itself to the server
 441  */
 442 void cmd_iden(char *argbuf)
 443 {
 444         int dev_code;
 445         int cli_code;
 446         int rev_level;
 447         char desc[SIZ];
 448         char from_host[SIZ];
 449         struct in_addr addr;
 450         int do_lookup = 0;
 451
 452         if (num_parms(argbuf)<4) {
 453                 cprintf("%d usage error\n",ERROR);
 454                 return;
 455         }
 456
 457         dev_code = extract_int(argbuf,0);
 458         cli_code = extract_int(argbuf,1);
 459         rev_level = extract_int(argbuf,2);
 460         extract(desc,argbuf,3);
 461
 462         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 463         from_host[sizeof from_host - 1] = 0;
 464         if (num_parms(argbuf)>=5) extract(from_host,argbuf,4);
 465
 466         CC->cs_clientdev = dev_code;
 467         CC->cs_clienttyp = cli_code;
 468         CC->cs_clientver = rev_level;
 469         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 470         CC->cs_clientname[31] = 0;
 471
 472         if (strlen(from_host) > 0) {
 473                 if (CC->is_local_socket) do_lookup = 1;
 474                 else if (is_public_client(CC->cs_host)) do_lookup = 1;
 475         }
 476
 477         if (do_lookup) {
 478                 lprintf(9, "Looking up hostname '%s'\n", from_host);
 479                 if ((addr.s_addr = inet_addr(from_host)) != -1) {
 480                         locate_host(CC->cs_host, sizeof CC->cs_host, &addr);
 481                 }
 482                 else {
 483                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 484                         CC->cs_host[sizeof CC->cs_host - 1] = 0;
 485                 }
 486         }
 487
 488         lprintf(7, "client %d/%d/%01d.%02d (%s)\n",
 489                 dev_code,
 490                 cli_code,
 491                 (rev_level / 100),
 492                 (rev_level % 100),
 493                 desc);
 494
 495         syslog(LOG_NOTICE,"session %d: client %d/%d/%01d.%02d (%s) from %s\n",
 496                 CC->cs_pid,
 497                 dev_code,
 498                 cli_code,
 499                 (rev_level / 100),
 500                 (rev_level % 100),
 501                 desc,
 502                 CC->cs_host);
 503         cprintf("%d Ok\n",CIT_OK);
 504 }
 505
 506
 507 /*
 508  * display system messages or help
 509  */
 510 void cmd_mesg(char *mname)
 511 {
 512         FILE *mfp;
 513         char targ[SIZ];
 514         char buf[SIZ];
 515         char buf2[SIZ];
 516         char *dirs[2];
 517
 518         extract(buf,mname,0);
 519
 520         dirs[0]=mallok(64);
 521         dirs[1]=mallok(64);
 522         strcpy(dirs[0],"messages");
 523         strcpy(dirs[1],"help");
 524         snprintf(buf2, sizeof buf2, "%s.%d.%d", buf, CC->cs_clientdev, CC->cs_clienttyp);
 525         mesg_locate(targ,sizeof targ,buf2,2,(const char **)dirs);
 526         if (strlen(targ) == 0) {
 527                 snprintf(buf2, sizeof buf2, "%s.%d", buf, CC->cs_clientdev);
 528                 mesg_locate(targ,sizeof targ,buf2,2,(const char **)dirs);
 529                 if (strlen(targ) == 0) {
 530                         mesg_locate(targ,sizeof targ,buf,2,(const char **)dirs);
 531                 }
 532         }
 533         phree(dirs[0]);
 534         phree(dirs[1]);
 535
 536         if (strlen(targ)==0) {
 537                 cprintf("%d '%s' not found.\n",ERROR,mname);
 538                 return;
 539         }
 540
 541         mfp = fopen(targ,"r");
 542         if (mfp==NULL) {
 543                 cprintf("%d Cannot open '%s': %s\n",
 544                         ERROR,targ,strerror(errno));
 545                 return;
 546         }
 547         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
 548
 549         while (fgets(buf, (SIZ-1), mfp)!=NULL) {
 550                 buf[strlen(buf)-1] = 0;
 551                 do_help_subst(buf);
 552                 cprintf("%s\n",buf);
 553         }
 554
 555         fclose(mfp);
 556         cprintf("000\n");
 557 }
 558
 559
 560 /*
 561  * enter system messages or help
 562  */
 563 void cmd_emsg(char *mname)
 564 {
 565         FILE *mfp;
 566         char targ[SIZ];
 567         char buf[SIZ];
 568         char *dirs[2];
 569         int a;
 570
 571         if (CtdlAccessCheck(ac_aide)) return;
 572
 573         extract(buf,mname,0);
 574         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 575                 if (buf[a] == '/') buf[a] = '.';
 576         }
 577
 578         dirs[0]=mallok(64);
 579         dirs[1]=mallok(64);
 580         strcpy(dirs[0],"messages");
 581         strcpy(dirs[1],"help");
 582         mesg_locate(targ,sizeof targ,buf,2,(const char**)dirs);
 583         phree(dirs[0]);
 584         phree(dirs[1]);
 585
 586         if (strlen(targ)==0) {
 587                 snprintf(targ, sizeof targ, "./help/%s", buf);
 588         }
 589
 590         mfp = fopen(targ,"w");
 591         if (mfp==NULL) {
 592                 cprintf("%d Cannot open '%s': %s\n",
 593                         ERROR,targ,strerror(errno));
 594                 return;
 595         }
 596         cprintf("%d %s\n", SEND_LISTING, targ);
 597
 598         while (client_gets(buf), strcmp(buf, "000")) {
 599                 fprintf(mfp, "%s\n", buf);
 600         }
 601
 602         fclose(mfp);
 603 }
 604
 605
 606 /* Don't show the names of private rooms unless the viewing
 607  * user also knows the rooms.
 608  */
 609 void GenerateRoomDisplay(char *real_room,
 610                         struct CitContext *viewed,
 611                         struct CitContext *viewer) {
 612
 613         strcpy(real_room, viewed->quickroom.QRname);
 614         if (viewed->quickroom.QRflags & QR_MAILBOX) {
 615                 strcpy(real_room, &real_room[11]);
 616         }
 617         if (viewed->quickroom.QRflags & QR_PRIVATE) {
 618                 if ( (CtdlRoomAccess(&viewed->quickroom, &viewer->usersupp)
 619                    & UA_KNOWN) == 0) {
 620                         strcpy(real_room, "<private room>");
 621                 }
 622         }
 623
 624         if (viewed->cs_flags & CS_CHAT) {
 625                 while (strlen(real_room) < 14)
 626                         strcat(real_room, " ");
 627
 628                 strcpy(&real_room[14], "<chat>");
 629         }
 630
 631 }
 632
 633 /*
 634  * Convenience function.
 635  */
 636 int CtdlAccessCheck(int required_level) {
 637
 638         if (CC->internal_pgm) return(0);
 639         if (required_level >= ac_internal) {
 640                 cprintf("%d This is not a user-level command.\n",
 641                         ERROR+HIGHER_ACCESS_REQUIRED);
 642                 return(-1);
 643         }
 644
 645         if (CC->usersupp.axlevel >= 6) return(0);
 646         if (required_level >= ac_aide) {
 647                 cprintf("%d This command requires Aide access.\n",
 648                         ERROR+HIGHER_ACCESS_REQUIRED);
 649                 return(-1);
 650         }
 651
 652         if (is_room_aide()) return(0);
 653         if (required_level >= ac_room_aide) {
 654                 cprintf("%d This command requires Aide or Room Aide access.\n",
 655                         ERROR + HIGHER_ACCESS_REQUIRED);
 656                 return(-1);
 657         }
 658
 659         if (CC->logged_in) return(0);
 660         if (required_level >= ac_logged_in) {
 661                 cprintf("%d Not logged in.\n", ERROR+NOT_LOGGED_IN);
 662                 return(-1);
 663         }
 664
 665         /* shhh ... succeed quietly */
 666         return(0);
 667 }
 668
 669
 670
 671 /*
 672  * Terminate another running session
 673  */
 674 void cmd_term(char *cmdbuf)
 675 {
 676         int session_num;
 677         struct CitContext *ccptr;
 678         int found_it = 0;
 679         int allowed = 0;
 680
 681         session_num = extract_int(cmdbuf, 0);
 682         if (session_num == CC->cs_pid) {
 683                 cprintf("%d You can't kill your own session.\n", ERROR);
 684                 return;
 685         }
 686
 687         lprintf(9, "Locating session to kill\n");
 688         begin_critical_section(S_SESSION_TABLE);
 689         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 690                 if (session_num == ccptr->cs_pid) {
 691                         found_it = 1;
 692                         if ((ccptr->usersupp.usernum == CC->usersupp.usernum)
 693                            || (CC->usersupp.axlevel >= 6)) {
 694                                 allowed = 1;
 695                                 ccptr->kill_me = 1;
 696                         }
 697                         else {
 698                                 allowed = 0;
 699                         }
 700                 }
 701         }
 702         end_critical_section(S_SESSION_TABLE);
 703
 704         if (found_it) {
 705                 if (allowed) {
 706                         cprintf("%d Session terminated.\n", CIT_OK);
 707                 }
 708                 else {
 709                         cprintf("%d You are not allowed to do that.\n",
 710                                 ERROR + HIGHER_ACCESS_REQUIRED);
 711                 }
 712         }
 713         else {
 714                 cprintf("%d No such session.\n", ERROR);
 715         }
 716 }
 717
 718
 719
 720
 721
 722 /*
 723  * get the paginator prompt
 724  */
 725 void cmd_more(void) {
 726         cprintf("%d %s\n", CIT_OK, config.c_moreprompt);
 727 }
 728
 729 /*
 730  * echo
 731  */
 732 void cmd_echo(char *etext)
 733 {
 734         cprintf("%d %s\n", CIT_OK, etext);
 735 }
 736
 737
 738
 739 /*
 740  * identify as internal program
 741  */
 742 void cmd_ipgm(char *argbuf)
 743 {
 744         int secret;
 745
 746         secret = extract_int(argbuf, 0);
 747         if (secret == config.c_ipgm_secret) {
 748                 CC->internal_pgm = 1;
 749                 strcpy(CC->curr_user, "<internal program>");
 750                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 751                 cprintf("%d Authenticated as an internal program.\n",CIT_OK);
 752         }
 753         else {
 754                 cprintf("%d Authentication failed.\n",ERROR);
 755                 lprintf(3, "Warning: ipgm authentication failed.\n");
 756         }
 757 }
 758
 759
 760 /*
 761  * Shut down the server
 762  */
 763 void cmd_down(void) {
 764
 765         if (CtdlAccessCheck(ac_aide)) return;
 766
 767         cprintf("%d Shutting down server.  Goodbye.\n", CIT_OK);
 768         time_to_die = 1;
 769 }
 770
 771 /*
 772  * Schedule or cancel a server shutdown
 773  */
 774 void cmd_scdn(char *argbuf)
 775 {
 776         int new_state;
 777
 778         if (CtdlAccessCheck(ac_aide)) return;
 779
 780         new_state = extract_int(argbuf, 0);
 781         if ((new_state == 0) || (new_state == 1)) {
 782                 ScheduledShutdown = new_state;
 783         }
 784         cprintf("%d %d\n", CIT_OK, ScheduledShutdown);
 785 }
 786
 787
 788 /*
 789  * Set or unset asynchronous protocol mode
 790  */
 791 void cmd_asyn(char *argbuf)
 792 {
 793         int new_state;
 794
 795         new_state = extract_int(argbuf, 0);
 796         if ((new_state == 0) || (new_state == 1)) {
 797                 CC->is_async = new_state;
 798         }
 799         cprintf("%d %d\n", CIT_OK, CC->is_async);
 800 }
 801
 802
 803 /*
 804  * Generate a "nonce" for APOP-style authentication.
 805  *
 806  * RFC 1725 et al specify a PID to be placed in front of the nonce.
 807  * Quoth BTX: That would be stupid.
 808  */
 809 void generate_nonce(struct CitContext *con) {
 810         struct timeval tv;
 811
 812         memset(con->cs_nonce, NONCE_SIZE, 0);
 813         gettimeofday(&tv, NULL);
 814         memset(con->cs_nonce, NONCE_SIZE, 0);
 815         snprintf(con->cs_nonce, NONCE_SIZE, "<%d%ld@%s>",
 816                 rand(), (long)tv.tv_usec, config.c_fqdn);
 817 }
 818
 819
 820
 821
 822 /*
 823  * Back-end function for starting a session
 824  */
 825 void begin_session(struct CitContext *con)
 826 {
 827         int len;
 828         struct sockaddr_in sin;
 829
 830         /*
 831          * Initialize some variables specific to our context.
 832          */
 833         con->logged_in = 0;
 834         con->internal_pgm = 0;
 835         con->download_fp = NULL;
 836         con->upload_fp = NULL;
 837         con->FirstExpressMessage = NULL;
 838         time(&con->lastcmd);
 839         time(&con->lastidle);
 840         strcpy(con->lastcmdname, "    ");
 841         strcpy(con->cs_clientname, "(unknown)");
 842         strcpy(con->curr_user, NLI);
 843         strcpy(con->net_node,"");
 844         strcpy(con->fake_username, "");
 845         strcpy(con->fake_postname, "");
 846         strcpy(con->fake_hostname, "");
 847         strcpy(con->fake_roomname, "");
 848         generate_nonce(con);
 849         snprintf(con->temp, sizeof con->temp, tmpnam(NULL));
 850         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 851         con->cs_host[sizeof con->cs_host - 1] = 0;
 852         len = sizeof sin;
 853         if (!CC->is_local_socket) {
 854                 if (!getpeername(con->client_socket,
 855                    (struct sockaddr *) &sin, &len))
 856                         locate_host(con->cs_host, sizeof con->cs_host, &sin.sin_addr);
 857         }
 858         else {
 859                 strcpy(con->cs_host, "");
 860         }
 861         con->cs_flags = 0;
 862         con->upload_type = UPL_FILE;
 863         con->dl_is_net = 0;
 864         con->FirstSessData = NULL;
 865
 866         con->nologin = 0;
 867         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 868                 con->nologin = 1;
 869
 870         lprintf(3, "Session started.\n");
 871
 872         /* Run any session startup routines registered by loadable modules */
 873         PerformSessionHooks(EVT_START);
 874
 875         rec_log(CL_CONNECT, "");
 876 }
 877
 878
 879 void citproto_begin_session() {
 880         if (CC->nologin==1) {
 881                 cprintf("%d %s: Too many users are already online "
 882                         "(maximum is %d)\n",
 883                         ERROR+MAX_SESSIONS_EXCEEDED,
 884                         config.c_nodename, config.c_maxsessions);
 885         }
 886         else {
 887                 cprintf("%d %s Citadel/UX server ready.\n",
 888                         CIT_OK, config.c_nodename);
 889         }
 890 }
 891
 892
 893
 894
 895 /*
 896  * This loop recognizes all server commands.
 897  */
 898 void do_command_loop(void) {
 899         char cmdbuf[SIZ];
 900
 901         time(&CC->lastcmd);
 902         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 903         if (client_gets(cmdbuf) < 1) {
 904                 lprintf(3, "Client socket is broken.  Ending session.\n");
 905                 CC->kill_me = 1;
 906                 return;
 907         }
 908         lprintf(5, "Citadel: %s\n", cmdbuf);
 909
 910         /*
 911          * Let other clients see the last command we executed, and
 912          * update the idle time, but not NOOP, QNOP, PEXP, or GEXP.
 913          */
 914         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 915            && (strncasecmp(cmdbuf, "QNOP", 4))
 916            && (strncasecmp(cmdbuf, "PEXP", 4))
 917            && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
 918                 strcpy(CC->lastcmdname, "    ");
 919                 safestrncpy(CC->lastcmdname, cmdbuf,
 920                         sizeof(CC->lastcmdname) );
 921                 time(&CC->lastidle);
 922         }
 923
 924         if ((strncasecmp(cmdbuf, "ENT0", 4))
 925            && (strncasecmp(cmdbuf, "MESG", 4))
 926            && (strncasecmp(cmdbuf, "MSGS", 4)))
 927         {
 928            CC->cs_flags &= ~CS_POSTING;
 929         }
 930
 931         if (!strncasecmp(cmdbuf,"NOOP",4)) {
 932                 cprintf("%d%cok\n",CIT_OK,CtdlCheckExpress());
 933         }
 934
 935         else if (!strncasecmp(cmdbuf,"QNOP",4)) {
 936                 /* do nothing, this command returns no response */
 937         }
 938
 939         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 940                 cprintf("%d Goodbye.\n",CIT_OK);
 941                 CC->kill_me = 1;
 942         }
 943
 944         else if (!strncasecmp(cmdbuf,"ASYN",4)) {
 945                 cmd_asyn(&cmdbuf[5]);
 946         }
 947
 948         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 949                 if (CC->logged_in) logout(CC);
 950                 cprintf("%d logged out.\n",CIT_OK);
 951         }
 952
 953         else if (!strncasecmp(cmdbuf,"USER",4)) {
 954                 cmd_user(&cmdbuf[5]);
 955         }
 956
 957         else if (!strncasecmp(cmdbuf,"PASS",4)) {
 958                 cmd_pass(&cmdbuf[5]);
 959         }
 960
 961         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 962                 cmd_newu(&cmdbuf[5]);
 963         }
 964
 965         else if (!strncasecmp(cmdbuf,"CREU",4)) {
 966                 cmd_creu(&cmdbuf[5]);
 967         }
 968
 969         else if (!strncasecmp(cmdbuf,"SETP",4)) {
 970                 cmd_setp(&cmdbuf[5]);
 971         }
 972
 973         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 974                 cmd_lrms(&cmdbuf[5]);
 975         }
 976
 977         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
 978                 cmd_lkra(&cmdbuf[5]);
 979         }
 980
 981         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
 982                 cmd_lkrn(&cmdbuf[5]);
 983         }
 984
 985         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
 986                 cmd_lkro(&cmdbuf[5]);
 987         }
 988
 989         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
 990                 cmd_lzrm(&cmdbuf[5]);
 991         }
 992
 993         else if (!strncasecmp(cmdbuf,"LPRM",4)) {
 994                 cmd_lprm(&cmdbuf[5]);
 995         }
 996
 997         else if (!strncasecmp(cmdbuf,"GETU",4)) {
 998                 cmd_getu();
 999         }
1000
1001         else if (!strncasecmp(cmdbuf,"SETU",4)) {
1002                 cmd_setu(&cmdbuf[5]);
1003         }
1004
1005         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
1006                 cmd_goto(&cmdbuf[5]);
1007         }
1008
1009         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
1010                 cmd_msgs(&cmdbuf[5]);
1011         }
1012
1013         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
1014                 cmd_whok();
1015         }
1016
1017         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
1018                 cmd_rdir();
1019         }
1020
1021         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
1022                 cmd_msg0(&cmdbuf[5]);
1023         }
1024
1025         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
1026                 cmd_msg2(&cmdbuf[5]);
1027         }
1028
1029         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
1030                 cmd_msg3(&cmdbuf[5]);
1031         }
1032
1033         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
1034                 cmd_msg4(&cmdbuf[5]);
1035         }
1036
1037         else if (!strncasecmp(cmdbuf,"MSGP",4)) {
1038                 cmd_msgp(&cmdbuf[5]);
1039         }
1040
1041         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
1042                 cmd_opna(&cmdbuf[5]);
1043         }
1044
1045         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1046                 cmd_info();
1047         }
1048
1049         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1050                 cmd_slrp(&cmdbuf[5]);
1051         }
1052
1053         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1054                 cmd_invt_kick(&cmdbuf[5],1);
1055         }
1056
1057         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1058                 cmd_invt_kick(&cmdbuf[5],0);
1059         }
1060
1061         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1062                 cmd_getr();
1063         }
1064
1065         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1066                 cmd_setr(&cmdbuf[5]);
1067         }
1068
1069         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1070                 cmd_geta();
1071         }
1072
1073         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1074                 cmd_seta(&cmdbuf[5]);
1075         }
1076
1077         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1078                 cmd_ent0(&cmdbuf[5]);
1079         }
1080
1081         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1082                 cmd_rinf();
1083         }
1084
1085         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1086                 cmd_dele(&cmdbuf[5]);
1087         }
1088
1089         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1090                 cmd_kill(&cmdbuf[5]);
1091         }
1092
1093         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1094                 cmd_cre8(&cmdbuf[5]);
1095         }
1096
1097         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1098                 cmd_move(&cmdbuf[5]);
1099         }
1100
1101         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1102                 cmd_forg();
1103         }
1104
1105         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1106                 cmd_mesg(&cmdbuf[5]);
1107         }
1108
1109         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1110                 cmd_emsg(&cmdbuf[5]);
1111         }
1112
1113         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1114                 cmd_gnur();
1115         }
1116
1117         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1118                 cmd_vali(&cmdbuf[5]);
1119         }
1120
1121         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1122                 cmd_einf(&cmdbuf[5]);
1123         }
1124
1125         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1126                 cmd_list();
1127         }
1128
1129         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1130                 cmd_chek();
1131         }
1132
1133         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1134                 cmd_delf(&cmdbuf[5]);
1135         }
1136
1137         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1138                 cmd_movf(&cmdbuf[5]);
1139         }
1140
1141         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1142                 cmd_netf(&cmdbuf[5]);
1143         }
1144
1145         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1146                 cmd_open(&cmdbuf[5]);
1147         }
1148
1149         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1150                 cmd_clos();
1151         }
1152
1153         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1154                 cmd_uopn(&cmdbuf[5]);
1155         }
1156
1157         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1158                 cmd_ucls(&cmdbuf[5]);
1159         }
1160
1161         else if (!strncasecmp(cmdbuf,"READ",4)) {
1162                 cmd_read(&cmdbuf[5]);
1163         }
1164
1165         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1166                 cmd_writ(&cmdbuf[5]);
1167         }
1168
1169         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1170                 cmd_qusr(&cmdbuf[5]);
1171         }
1172
1173         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1174                 cmd_echo(&cmdbuf[5]);
1175         }
1176
1177         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1178                 cmd_oimg(&cmdbuf[5]);
1179         }
1180
1181         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1182                 cmd_more();
1183         }
1184
1185         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1186                 cmd_ndop(&cmdbuf[5]);
1187         }
1188
1189         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1190                 cmd_nuop(&cmdbuf[5]);
1191         }
1192
1193         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1194                 cmd_lflr();
1195         }
1196
1197         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1198                 cmd_cflr(&cmdbuf[5]);
1199         }
1200
1201         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1202                 cmd_kflr(&cmdbuf[5]);
1203         }
1204
1205         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1206                 cmd_eflr(&cmdbuf[5]);
1207         }
1208
1209         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1210                 cmd_iden(&cmdbuf[5]);
1211         }
1212
1213         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1214                 cmd_ipgm(&cmdbuf[5]);
1215         }
1216
1217         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1218                 cmd_term(&cmdbuf[5]);
1219         }
1220
1221         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1222                 cmd_down();
1223         }
1224
1225         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1226                 cmd_scdn(&cmdbuf[5]);
1227         }
1228
1229         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1230                 cmd_uimg(&cmdbuf[5]);
1231         }
1232
1233         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1234                 cmd_time();
1235         }
1236
1237         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1238                 cmd_agup(&cmdbuf[5]);
1239         }
1240
1241         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1242                 cmd_asup(&cmdbuf[5]);
1243         }
1244
1245         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1246                 cmd_gpex(&cmdbuf[5]);
1247         }
1248
1249         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1250                 cmd_spex(&cmdbuf[5]);
1251         }
1252
1253         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1254                 cmd_conf(&cmdbuf[5]);
1255         }
1256
1257         else if (!strncasecmp(cmdbuf, "SEEN", 4)) {
1258                 cmd_seen(&cmdbuf[5]);
1259         }
1260
1261         else if (!strncasecmp(cmdbuf, "GTSN", 4)) {
1262                 cmd_gtsn(&cmdbuf[5]);
1263         }
1264
1265         else if (!strncasecmp(cmdbuf, "VIEW", 4)) {
1266                 cmd_view(&cmdbuf[5]);
1267         }
1268
1269         else if (!strncasecmp(cmdbuf, "ISME", 4)) {
1270                 cmd_isme(&cmdbuf[5]);
1271         }
1272
1273 #ifdef DEBUG_MEMORY_LEAKS
1274         else if (!strncasecmp(cmdbuf, "LEAK", 4)) {
1275                 dump_tracked();
1276         }
1277 #endif
1278
1279         else if (!DLoader_Exec_Cmd(cmdbuf)) {
1280                 cprintf("%d Unrecognized or unsupported command.\n", ERROR);
1281                }
1282
1283         /* Run any after-each-command outines registered by modules */
1284         PerformSessionHooks(EVT_CMD);
1285 }