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 buf2[SIZ];
 509         char *dirs[2];
 510
 511         extract(buf,mname,0);
 512
 513         dirs[0]=mallok(64);
 514         dirs[1]=mallok(64);
 515         strcpy(dirs[0],"messages");
 516         strcpy(dirs[1],"help");
 517         snprintf(buf2, sizeof buf2, "%s.%d.%d", buf, CC->cs_clientdev, CC->cs_clienttyp);
 518         mesg_locate(targ,sizeof targ,buf2,2,(const char **)dirs);
 519         if (strlen(targ) == 0) {
 520                 snprintf(buf2, sizeof buf2, "%s.%d", buf, CC->cs_clientdev);
 521                 mesg_locate(targ,sizeof targ,buf2,2,(const char **)dirs);
 522                 if (strlen(targ) == 0) {
 523                         mesg_locate(targ,sizeof targ,buf,2,(const char **)dirs);
 524                 }
 525         }
 526         phree(dirs[0]);
 527         phree(dirs[1]);
 528
 529         if (strlen(targ)==0) {
 530                 cprintf("%d '%s' not found.\n",ERROR,mname);
 531                 return;
 532         }
 533
 534         mfp = fopen(targ,"r");
 535         if (mfp==NULL) {
 536                 cprintf("%d Cannot open '%s': %s\n",
 537                         ERROR,targ,strerror(errno));
 538                 return;
 539         }
 540         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
 541
 542         while (fgets(buf, (SIZ-1), mfp)!=NULL) {
 543                 buf[strlen(buf)-1] = 0;
 544                 do_help_subst(buf);
 545                 cprintf("%s\n",buf);
 546         }
 547
 548         fclose(mfp);
 549         cprintf("000\n");
 550 }
 551
 552
 553 /*
 554  * enter system messages or help
 555  */
 556 void cmd_emsg(char *mname)
 557 {
 558         FILE *mfp;
 559         char targ[SIZ];
 560         char buf[SIZ];
 561         char *dirs[2];
 562         int a;
 563
 564         if (CtdlAccessCheck(ac_aide)) return;
 565
 566         extract(buf,mname,0);
 567         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 568                 if (buf[a] == '/') buf[a] = '.';
 569         }
 570
 571         dirs[0]=mallok(64);
 572         dirs[1]=mallok(64);
 573         strcpy(dirs[0],"messages");
 574         strcpy(dirs[1],"help");
 575         mesg_locate(targ,sizeof targ,buf,2,(const char**)dirs);
 576         phree(dirs[0]);
 577         phree(dirs[1]);
 578
 579         if (strlen(targ)==0) {
 580                 snprintf(targ, sizeof targ, "./help/%s", buf);
 581         }
 582
 583         mfp = fopen(targ,"w");
 584         if (mfp==NULL) {
 585                 cprintf("%d Cannot open '%s': %s\n",
 586                         ERROR,targ,strerror(errno));
 587                 return;
 588         }
 589         cprintf("%d %s\n", SEND_LISTING, targ);
 590
 591         while (client_gets(buf), strcmp(buf, "000")) {
 592                 fprintf(mfp, "%s\n", buf);
 593         }
 594
 595         fclose(mfp);
 596 }
 597
 598
 599 /* Don't show the names of private rooms unless the viewing
 600  * user also knows the rooms.
 601  */
 602 void GenerateRoomDisplay(char *real_room,
 603                         struct CitContext *viewed,
 604                         struct CitContext *viewer) {
 605
 606         strcpy(real_room, viewed->quickroom.QRname);
 607         if (viewed->quickroom.QRflags & QR_MAILBOX) {
 608                 strcpy(real_room, &real_room[11]);
 609         }
 610         if (viewed->quickroom.QRflags & QR_PRIVATE) {
 611                 if ( (CtdlRoomAccess(&viewed->quickroom, &viewer->usersupp)
 612                    & UA_KNOWN) == 0) {
 613                         strcpy(real_room, "<private room>");
 614                 }
 615         }
 616
 617         if (viewed->cs_flags & CS_CHAT) {
 618                 while (strlen(real_room) < 14)
 619                         strcat(real_room, " ");
 620
 621                 strcpy(&real_room[14], "<chat>");
 622         }
 623
 624 }
 625
 626 /*
 627  * Convenience function.
 628  */
 629 int CtdlAccessCheck(int required_level) {
 630
 631         if (CC->internal_pgm) return(0);
 632         if (required_level >= ac_internal) {
 633                 cprintf("%d This is not a user-level command.\n",
 634                         ERROR+HIGHER_ACCESS_REQUIRED);
 635                 return(-1);
 636         }
 637
 638         if (CC->usersupp.axlevel >= 6) return(0);
 639         if (required_level >= ac_aide) {
 640                 cprintf("%d This command requires Aide access.\n",
 641                         ERROR+HIGHER_ACCESS_REQUIRED);
 642                 return(-1);
 643         }
 644
 645         if (is_room_aide()) return(0);
 646         if (required_level >= ac_room_aide) {
 647                 cprintf("%d This command requires Aide or Room Aide access.\n",
 648                         ERROR + HIGHER_ACCESS_REQUIRED);
 649                 return(-1);
 650         }
 651
 652         if (CC->logged_in) return(0);
 653         if (required_level >= ac_logged_in) {
 654                 cprintf("%d Not logged in.\n", ERROR+NOT_LOGGED_IN);
 655                 return(-1);
 656         }
 657
 658         /* shhh ... succeed quietly */
 659         return(0);
 660 }
 661
 662
 663
 664 /*
 665  * Terminate another running session
 666  */
 667 void cmd_term(char *cmdbuf)
 668 {
 669         int session_num;
 670         struct CitContext *ccptr;
 671         int found_it = 0;
 672         int allowed = 0;
 673
 674         session_num = extract_int(cmdbuf, 0);
 675         if (session_num == CC->cs_pid) {
 676                 cprintf("%d You can't kill your own session.\n", ERROR);
 677                 return;
 678         }
 679
 680         lprintf(9, "Locating session to kill\n");
 681         begin_critical_section(S_SESSION_TABLE);
 682         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 683                 if (session_num == ccptr->cs_pid) {
 684                         found_it = 1;
 685                         if ((ccptr->usersupp.usernum == CC->usersupp.usernum)
 686                            || (CC->usersupp.axlevel >= 6)) {
 687                                 allowed = 1;
 688                                 ccptr->kill_me = 1;
 689                         }
 690                         else {
 691                                 allowed = 0;
 692                         }
 693                 }
 694         }
 695         end_critical_section(S_SESSION_TABLE);
 696
 697         if (found_it) {
 698                 if (allowed) {
 699                         cprintf("%d Session terminated.\n", CIT_OK);
 700                 }
 701                 else {
 702                         cprintf("%d You are not allowed to do that.\n",
 703                                 ERROR + HIGHER_ACCESS_REQUIRED);
 704                 }
 705         }
 706         else {
 707                 cprintf("%d No such session.\n", ERROR);
 708         }
 709 }
 710
 711
 712
 713
 714
 715 /*
 716  * get the paginator prompt
 717  */
 718 void cmd_more(void) {
 719         cprintf("%d %s\n", CIT_OK, config.c_moreprompt);
 720 }
 721
 722 /*
 723  * echo
 724  */
 725 void cmd_echo(char *etext)
 726 {
 727         cprintf("%d %s\n", CIT_OK, etext);
 728 }
 729
 730
 731
 732 /*
 733  * identify as internal program
 734  */
 735 void cmd_ipgm(char *argbuf)
 736 {
 737         int secret;
 738
 739         secret = extract_int(argbuf, 0);
 740         if (secret == config.c_ipgm_secret) {
 741                 CC->internal_pgm = 1;
 742                 strcpy(CC->curr_user, "<internal program>");
 743                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 744                 cprintf("%d Authenticated as an internal program.\n",CIT_OK);
 745         }
 746         else {
 747                 cprintf("%d Authentication failed.\n",ERROR);
 748                 lprintf(3, "Warning: ipgm authentication failed.\n");
 749         }
 750 }
 751
 752
 753 /*
 754  * Shut down the server
 755  */
 756 void cmd_down(void) {
 757
 758         if (CtdlAccessCheck(ac_aide)) return;
 759
 760         cprintf("%d Shutting down server.  Goodbye.\n", CIT_OK);
 761         time_to_die = 1;
 762 }
 763
 764 /*
 765  * Schedule or cancel a server shutdown
 766  */
 767 void cmd_scdn(char *argbuf)
 768 {
 769         int new_state;
 770
 771         if (CtdlAccessCheck(ac_aide)) return;
 772
 773         new_state = extract_int(argbuf, 0);
 774         if ((new_state == 0) || (new_state == 1)) {
 775                 ScheduledShutdown = new_state;
 776         }
 777         cprintf("%d %d\n", CIT_OK, ScheduledShutdown);
 778 }
 779
 780
 781 /*
 782  * Set or unset asynchronous protocol mode
 783  */
 784 void cmd_asyn(char *argbuf)
 785 {
 786         int new_state;
 787
 788         new_state = extract_int(argbuf, 0);
 789         if ((new_state == 0) || (new_state == 1)) {
 790                 CC->is_async = new_state;
 791         }
 792         cprintf("%d %d\n", CIT_OK, CC->is_async);
 793 }
 794
 795
 796 /*
 797  * Generate a "nonce" for APOP-style authentication.
 798  *
 799  * RFC 1725 et al specify a PID to be placed in front of the nonce.
 800  * Quoth BTX: That would be stupid.
 801  */
 802 void generate_nonce(struct CitContext *con) {
 803         struct timeval tv;
 804
 805         memset(con->cs_nonce, NONCE_SIZE, 0);
 806         gettimeofday(&tv, NULL);
 807         memset(con->cs_nonce, NONCE_SIZE, 0);
 808         snprintf(con->cs_nonce, NONCE_SIZE, "<%d%ld@%s>",
 809                 rand(), (long)tv.tv_usec, config.c_fqdn);
 810 }
 811
 812
 813
 814
 815 /*
 816  * Back-end function for starting a session
 817  */
 818 void begin_session(struct CitContext *con)
 819 {
 820         int len;
 821         struct sockaddr_in sin;
 822
 823         /*
 824          * Initialize some variables specific to our context.
 825          */
 826         con->logged_in = 0;
 827         con->internal_pgm = 0;
 828         con->download_fp = NULL;
 829         con->upload_fp = NULL;
 830         con->FirstExpressMessage = NULL;
 831         time(&con->lastcmd);
 832         time(&con->lastidle);
 833         strcpy(con->lastcmdname, "    ");
 834         strcpy(con->cs_clientname, "(unknown)");
 835         strcpy(con->curr_user, NLI);
 836         strcpy(con->net_node,"");
 837         strcpy(con->fake_username, "");
 838         strcpy(con->fake_postname, "");
 839         strcpy(con->fake_hostname, "");
 840         strcpy(con->fake_roomname, "");
 841         generate_nonce(con);
 842         snprintf(con->temp, sizeof con->temp, tmpnam(NULL));
 843         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 844         con->cs_host[sizeof con->cs_host - 1] = 0;
 845         len = sizeof sin;
 846         if (!CC->is_local_socket) {
 847                 if (!getpeername(con->client_socket,
 848                    (struct sockaddr *) &sin, &len))
 849                         locate_host(con->cs_host, sizeof con->cs_host, &sin.sin_addr);
 850         }
 851         else {
 852                 strcpy(con->cs_host, "");
 853         }
 854         con->cs_flags = 0;
 855         con->upload_type = UPL_FILE;
 856         con->dl_is_net = 0;
 857         con->FirstSessData = NULL;
 858
 859         con->nologin = 0;
 860         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 861                 con->nologin = 1;
 862
 863         lprintf(3, "Session started.\n");
 864
 865         /* Run any session startup routines registered by loadable modules */
 866         PerformSessionHooks(EVT_START);
 867
 868         rec_log(CL_CONNECT, "");
 869 }
 870
 871
 872 void citproto_begin_session() {
 873         if (CC->nologin==1) {
 874                 cprintf("%d %s: Too many users are already online "
 875                         "(maximum is %d)\n",
 876                         ERROR+MAX_SESSIONS_EXCEEDED,
 877                         config.c_nodename, config.c_maxsessions);
 878         }
 879         else {
 880                 cprintf("%d %s Citadel/UX server ready.\n",
 881                         CIT_OK, config.c_nodename);
 882         }
 883 }
 884
 885
 886
 887
 888 /*
 889  * This loop recognizes all server commands.
 890  */
 891 void do_command_loop(void) {
 892         char cmdbuf[SIZ];
 893
 894         time(&CC->lastcmd);
 895         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 896         if (client_gets(cmdbuf) < 1) {
 897                 lprintf(3, "Client socket is broken.  Ending session.\n");
 898                 CC->kill_me = 1;
 899                 return;
 900         }
 901         lprintf(5, "Citadel: %s\n", cmdbuf);
 902
 903         /*
 904          * Let other clients see the last command we executed, and
 905          * update the idle time, but not NOOP, QNOP, PEXP, or GEXP.
 906          */
 907         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 908            && (strncasecmp(cmdbuf, "QNOP", 4))
 909            && (strncasecmp(cmdbuf, "PEXP", 4))
 910            && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
 911                 strcpy(CC->lastcmdname, "    ");
 912                 safestrncpy(CC->lastcmdname, cmdbuf,
 913                         sizeof(CC->lastcmdname) );
 914                 time(&CC->lastidle);
 915         }
 916
 917         if ((strncasecmp(cmdbuf, "ENT0", 4))
 918            && (strncasecmp(cmdbuf, "MESG", 4))
 919            && (strncasecmp(cmdbuf, "MSGS", 4)))
 920         {
 921            CC->cs_flags &= ~CS_POSTING;
 922         }
 923
 924         if (!strncasecmp(cmdbuf,"NOOP",4)) {
 925                 cprintf("%d%cok\n",CIT_OK,CtdlCheckExpress());
 926         }
 927
 928         else if (!strncasecmp(cmdbuf,"QNOP",4)) {
 929                 /* do nothing, this command returns no response */
 930         }
 931
 932         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 933                 cprintf("%d Goodbye.\n",CIT_OK);
 934                 CC->kill_me = 1;
 935         }
 936
 937         else if (!strncasecmp(cmdbuf,"ASYN",4)) {
 938                 cmd_asyn(&cmdbuf[5]);
 939         }
 940
 941         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 942                 if (CC->logged_in) logout(CC);
 943                 cprintf("%d logged out.\n",CIT_OK);
 944         }
 945
 946         else if (!strncasecmp(cmdbuf,"USER",4)) {
 947                 cmd_user(&cmdbuf[5]);
 948         }
 949
 950         else if (!strncasecmp(cmdbuf,"PASS",4)) {
 951                 cmd_pass(&cmdbuf[5]);
 952         }
 953
 954         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 955                 cmd_newu(&cmdbuf[5]);
 956         }
 957
 958         else if (!strncasecmp(cmdbuf,"CREU",4)) {
 959                 cmd_creu(&cmdbuf[5]);
 960         }
 961
 962         else if (!strncasecmp(cmdbuf,"SETP",4)) {
 963                 cmd_setp(&cmdbuf[5]);
 964         }
 965
 966         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 967                 cmd_lrms(&cmdbuf[5]);
 968         }
 969
 970         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
 971                 cmd_lkra(&cmdbuf[5]);
 972         }
 973
 974         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
 975                 cmd_lkrn(&cmdbuf[5]);
 976         }
 977
 978         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
 979                 cmd_lkro(&cmdbuf[5]);
 980         }
 981
 982         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
 983                 cmd_lzrm(&cmdbuf[5]);
 984         }
 985
 986         else if (!strncasecmp(cmdbuf,"GETU",4)) {
 987                 cmd_getu();
 988         }
 989
 990         else if (!strncasecmp(cmdbuf,"SETU",4)) {
 991                 cmd_setu(&cmdbuf[5]);
 992         }
 993
 994         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
 995                 cmd_goto(&cmdbuf[5]);
 996         }
 997
 998         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
 999                 cmd_msgs(&cmdbuf[5]);
1000         }
1001
1002         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
1003                 cmd_whok();
1004         }
1005
1006         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
1007                 cmd_rdir();
1008         }
1009
1010         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
1011                 cmd_msg0(&cmdbuf[5]);
1012         }
1013
1014         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
1015                 cmd_msg2(&cmdbuf[5]);
1016         }
1017
1018         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
1019                 cmd_msg3(&cmdbuf[5]);
1020         }
1021
1022         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
1023                 cmd_msg4(&cmdbuf[5]);
1024         }
1025
1026         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
1027                 cmd_opna(&cmdbuf[5]);
1028         }
1029
1030         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1031                 cmd_info();
1032         }
1033
1034         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1035                 cmd_slrp(&cmdbuf[5]);
1036         }
1037
1038         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1039                 cmd_invt_kick(&cmdbuf[5],1);
1040         }
1041
1042         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1043                 cmd_invt_kick(&cmdbuf[5],0);
1044         }
1045
1046         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1047                 cmd_getr();
1048         }
1049
1050         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1051                 cmd_setr(&cmdbuf[5]);
1052         }
1053
1054         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1055                 cmd_geta();
1056         }
1057
1058         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1059                 cmd_seta(&cmdbuf[5]);
1060         }
1061
1062         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1063                 cmd_ent0(&cmdbuf[5]);
1064         }
1065
1066         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1067                 cmd_rinf();
1068         }
1069
1070         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1071                 cmd_dele(&cmdbuf[5]);
1072         }
1073
1074         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1075                 cmd_kill(&cmdbuf[5]);
1076         }
1077
1078         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1079                 cmd_cre8(&cmdbuf[5]);
1080         }
1081
1082         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1083                 cmd_move(&cmdbuf[5]);
1084         }
1085
1086         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1087                 cmd_forg();
1088         }
1089
1090         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1091                 cmd_mesg(&cmdbuf[5]);
1092         }
1093
1094         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1095                 cmd_emsg(&cmdbuf[5]);
1096         }
1097
1098         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1099                 cmd_gnur();
1100         }
1101
1102         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1103                 cmd_vali(&cmdbuf[5]);
1104         }
1105
1106         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1107                 cmd_einf(&cmdbuf[5]);
1108         }
1109
1110         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1111                 cmd_list();
1112         }
1113
1114         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1115                 cmd_chek();
1116         }
1117
1118         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1119                 cmd_delf(&cmdbuf[5]);
1120         }
1121
1122         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1123                 cmd_movf(&cmdbuf[5]);
1124         }
1125
1126         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1127                 cmd_netf(&cmdbuf[5]);
1128         }
1129
1130         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1131                 cmd_open(&cmdbuf[5]);
1132         }
1133
1134         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1135                 cmd_clos();
1136         }
1137
1138         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1139                 cmd_uopn(&cmdbuf[5]);
1140         }
1141
1142         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1143                 cmd_ucls(&cmdbuf[5]);
1144         }
1145
1146         else if (!strncasecmp(cmdbuf,"READ",4)) {
1147                 cmd_read(&cmdbuf[5]);
1148         }
1149
1150         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1151                 cmd_writ(&cmdbuf[5]);
1152         }
1153
1154         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1155                 cmd_qusr(&cmdbuf[5]);
1156         }
1157
1158         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1159                 cmd_echo(&cmdbuf[5]);
1160         }
1161
1162         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1163                 cmd_oimg(&cmdbuf[5]);
1164         }
1165
1166         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1167                 cmd_more();
1168         }
1169
1170         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1171                 cmd_ndop(&cmdbuf[5]);
1172         }
1173
1174         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1175                 cmd_nuop(&cmdbuf[5]);
1176         }
1177
1178         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1179                 cmd_lflr();
1180         }
1181
1182         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1183                 cmd_cflr(&cmdbuf[5]);
1184         }
1185
1186         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1187                 cmd_kflr(&cmdbuf[5]);
1188         }
1189
1190         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1191                 cmd_eflr(&cmdbuf[5]);
1192         }
1193
1194         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1195                 cmd_iden(&cmdbuf[5]);
1196         }
1197
1198         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1199                 cmd_ipgm(&cmdbuf[5]);
1200         }
1201
1202         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1203                 cmd_term(&cmdbuf[5]);
1204         }
1205
1206         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1207                 cmd_down();
1208         }
1209
1210         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1211                 cmd_scdn(&cmdbuf[5]);
1212         }
1213
1214         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1215                 cmd_uimg(&cmdbuf[5]);
1216         }
1217
1218         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1219                 cmd_time();
1220         }
1221
1222         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1223                 cmd_agup(&cmdbuf[5]);
1224         }
1225
1226         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1227                 cmd_asup(&cmdbuf[5]);
1228         }
1229
1230         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1231                 cmd_gpex(&cmdbuf[5]);
1232         }
1233
1234         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1235                 cmd_spex(&cmdbuf[5]);
1236         }
1237
1238         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1239                 cmd_conf(&cmdbuf[5]);
1240         }
1241
1242         else if (!strncasecmp(cmdbuf, "SEEN", 4)) {
1243                 cmd_seen(&cmdbuf[5]);
1244         }
1245
1246         else if (!strncasecmp(cmdbuf, "GTSN", 4)) {
1247                 cmd_gtsn(&cmdbuf[5]);
1248         }
1249
1250         else if (!strncasecmp(cmdbuf, "VIEW", 4)) {
1251                 cmd_view(&cmdbuf[5]);
1252         }
1253
1254 #ifdef DEBUG_MEMORY_LEAKS
1255         else if (!strncasecmp(cmdbuf, "LEAK", 4)) {
1256                 dump_tracked();
1257         }
1258 #endif
1259
1260         else if (!DLoader_Exec_Cmd(cmdbuf)) {
1261                 cprintf("%d Unrecognized or unsupported command.\n", ERROR);
1262                }
1263
1264         /* Run any after-each-command outines registered by modules */
1265         PerformSessionHooks(EVT_CMD);
1266 }