citadel/citserver.c

   1 /*
   2  * $Id$
   3  *
   4  * Main source module for the Citadel server
   5  *
   6  */
   7
   8 #include "sysdep.h"
   9 #include <stdlib.h>
  10 #include <unistd.h>
  11 #include <stdio.h>
  12 #include <fcntl.h>
  13 #include <signal.h>
  14 #include <sys/types.h>
  15 #include <sys/stat.h>
  16
  17
  18 #if TIME_WITH_SYS_TIME
  19 # include <sys/time.h>
  20 # include <time.h>
  21 #else
  22 # if HAVE_SYS_TIME_H
  23 #  include <sys/time.h>
  24 # else
  25 #  include <time.h>
  26 # endif
  27 #endif
  28
  29 #if HAVE_BACKTRACE
  30 #include <execinfo.h>
  31 #endif
  32
  33 #include <ctype.h>
  34 #include <string.h>
  35 #include <dirent.h>
  36 #include <errno.h>
  37 #include <limits.h>
  38 #include <netdb.h>
  39 #include <sys/types.h>
  40 #include <sys/socket.h>
  41 #include <netinet/in.h>
  42 #include <arpa/inet.h>
  43 #include <libcitadel.h>
  44 #include "citadel.h"
  45 #include "server.h"
  46 #include "sysdep_decls.h"
  47 #include "threads.h"
  48 #include "citserver.h"
  49 #include "config.h"
  50 #include "database.h"
  51 #include "housekeeping.h"
  52 #include "user_ops.h"
  53 #include "msgbase.h"
  54 #include "support.h"
  55 #include "locate_host.h"
  56 #include "room_ops.h"
  57 #include "file_ops.h"
  58 #include "policy.h"
  59 #include "control.h"
  60 #include "euidindex.h"
  61
  62 #ifndef HAVE_SNPRINTF
  63 #include "snprintf.h"
  64 #endif
  65
  66 #include "ctdl_module.h"
  67
  68
  69 struct CitContext *ContextList = NULL;
  70 struct CitContext* next_session = NULL;
  71 char *unique_session_numbers;
  72 int ScheduledShutdown = 0;
  73 int do_defrag = 0;
  74 time_t server_startup_time;
  75 int panic_fd;
  76
  77 /**
  78  * \brief print the actual stack frame.
  79  */
  80 void cit_backtrace(void)
  81 {
  82 #ifdef HAVE_BACKTRACE
  83         void *stack_frames[50];
  84         size_t size, i;
  85         char **strings;
  86
  87
  88         size = backtrace(stack_frames, sizeof(stack_frames) / sizeof(void*));
  89         strings = backtrace_symbols(stack_frames, size);
  90         for (i = 0; i < size; i++) {
  91                 if (strings != NULL)
  92                         lprintf(1, "%s\n", strings[i]);
  93                 else
  94                         lprintf(1, "%p\n", stack_frames[i]);
  95         }
  96         free(strings);
  97 #endif
  98 }
  99
 100 /**
 101  * \brief print the actual stack frame.
 102  */
 103 void cit_panic_backtrace(int SigNum)
 104 {
 105 #ifdef HAVE_BACKTRACE
 106         void *stack_frames[10];
 107         size_t size, i;
 108         char **strings;
 109
 110         printf("caught signal 11\n");
 111         size = backtrace(stack_frames, sizeof(stack_frames) / sizeof(void*));
 112         strings = backtrace_symbols(stack_frames, size);
 113         for (i = 0; i < size; i++) {
 114                 if (strings != NULL)
 115                         lprintf(1, "%s\n", strings[i]);
 116                 else
 117                         lprintf(1, "%p\n", stack_frames[i]);
 118         }
 119         free(strings);
 120 #endif
 121         exit(-1);
 122 }
 123
 124 /*
 125  * Various things that need to be initialized at startup
 126  */
 127 void master_startup(void) {
 128         struct timeval tv;
 129         unsigned int seed;
 130         FILE *urandom;
 131         struct ctdlroom qrbuf;
 132
 133         lprintf(CTDL_DEBUG, "master_startup() started\n");
 134         time(&server_startup_time);
 135
 136         lprintf(CTDL_INFO, "Opening databases\n");
 137         open_databases();
 138
 139         ctdl_thread_internal_init_tsd();
 140
 141         CtdlThreadAllocTSD();
 142
 143         if (do_defrag) {
 144                 defrag_databases();
 145         }
 146
 147         check_ref_counts();
 148
 149         lprintf(CTDL_INFO, "Creating base rooms (if necessary)\n");
 150         create_room(config.c_baseroom,  0, "", 0, 1, 0, VIEW_BBS);
 151         create_room(AIDEROOM,           3, "", 0, 1, 0, VIEW_BBS);
 152         create_room(SYSCONFIGROOM,      3, "", 0, 1, 0, VIEW_BBS);
 153         create_room(config.c_twitroom,  0, "", 0, 1, 0, VIEW_BBS);
 154
 155         /* The "Local System Configuration" room doesn't need to be visible */
 156         if (lgetroom(&qrbuf, SYSCONFIGROOM) == 0) {
 157                 qrbuf.QRflags2 |= QR2_SYSTEM;
 158                 lputroom(&qrbuf);
 159         }
 160
 161         lprintf(CTDL_INFO, "Seeding the pseudo-random number generator...\n");
 162         urandom = fopen("/dev/urandom", "r");
 163         if (urandom != NULL) {
 164                 fread(&seed, sizeof seed, 1, urandom);
 165                 fclose(urandom);
 166         }
 167         else {
 168                 gettimeofday(&tv, NULL);
 169                 seed = tv.tv_usec;
 170         }
 171         srandom(seed);
 172
 173         lprintf(CTDL_INFO, "Initializing ipgm secret\n");
 174         get_config();
 175         config.c_ipgm_secret = rand();
 176         put_config();
 177
 178         lprintf(CTDL_DEBUG, "master_startup() finished\n");
 179 }
 180
 181
 182 /*
 183  * Cleanup routine to be called when the server is shutting down.
 184  */
 185 void master_cleanup(int exitcode) {
 186         struct CleanupFunctionHook *fcn;
 187         static int already_cleaning_up = 0;
 188
 189         if (already_cleaning_up) while(1) sleep(1);
 190         already_cleaning_up = 1;
 191
 192         /* Run any cleanup routines registered by loadable modules */
 193         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
 194                 (*fcn->h_function_pointer)();
 195         }
 196
 197         /* Close the AdjRefCount queue file */
 198         AdjRefCount(-1, 0);
 199
 200         /* Do system-dependent stuff */
 201         sysdep_master_cleanup();
 202
 203         /* Close databases */
 204         lprintf(CTDL_INFO, "Closing databases\n");
 205         close_databases();
 206
 207 #ifdef DEBUG_MEMORY_LEAKS
 208         dump_heap();
 209 #endif
 210
 211         /* If the operator requested a halt but not an exit, halt here. */
 212         if (shutdown_and_halt) {
 213                 lprintf(CTDL_NOTICE, "citserver: Halting server without exiting.\n");
 214                 fflush(stdout); fflush(stderr);
 215                 while(1) {
 216                         sleep(32767);
 217                 }
 218         }
 219
 220         release_control();
 221
 222         /* Now go away. */
 223         lprintf(CTDL_NOTICE, "citserver: Exiting with status %d\n", exitcode);
 224         fflush(stdout); fflush(stderr);
 225
 226         if (restart_server != 0)
 227                 exit(1);
 228         exit(exitcode);
 229 }
 230
 231
 232
 233 /*
 234  * Terminate a session.
 235  */
 236 void RemoveContext (struct CitContext *con)
 237 {
 238         if (con==NULL) {
 239                 lprintf(CTDL_ERR,
 240                         "WARNING: RemoveContext() called with NULL!\n");
 241                 return;
 242         }
 243         lprintf(CTDL_DEBUG, "RemoveContext() session %d\n", con->cs_pid);
 244
 245         /* Run any cleanup routines registered by loadable modules.
 246          * Note: We have to "become_session()" because the cleanup functions
 247          *       might make references to "CC" assuming it's the right one.
 248          */
 249         become_session(con);
 250         PerformSessionHooks(EVT_STOP);
 251         become_session(NULL);
 252
 253         /* Now handle all of the administrivia. */
 254         lprintf(CTDL_DEBUG, "Calling logout(%d)\n", con->cs_pid);
 255         logout(con);
 256
 257         lprintf(CTDL_NOTICE, "[%3d] Session ended.\n", con->cs_pid);
 258
 259         /* If the client is still connected, blow 'em away. */
 260         lprintf(CTDL_DEBUG, "Closing socket %d\n", con->client_socket);
 261         close(con->client_socket);
 262
 263         lprintf(CTDL_DEBUG, "Done with RemoveContext()\n");
 264 }
 265
 266
 267
 268
 269
 270 /*
 271  * cmd_info()  -  tell the client about this server
 272  */
 273 void cmd_info(void) {
 274         cprintf("%d Server info:\n", LISTING_FOLLOWS);
 275         cprintf("%d\n", CC->cs_pid);
 276         cprintf("%s\n", config.c_nodename);
 277         cprintf("%s\n", config.c_humannode);
 278         cprintf("%s\n", config.c_fqdn);
 279         cprintf("%s\n", CITADEL);
 280         cprintf("%d\n", REV_LEVEL);
 281         cprintf("%s\n", config.c_site_location);
 282         cprintf("%s\n", config.c_sysadm);
 283         cprintf("%d\n", SERVER_TYPE);
 284         cprintf("%s\n", config.c_moreprompt);
 285         cprintf("1\n"); /* 1 = yes, this system supports floors */
 286         cprintf("1\n"); /* 1 = we support the extended paging options */
 287         cprintf("%s\n", CC->cs_nonce);
 288         cprintf("1\n"); /* 1 = yes, this system supports the QNOP command */
 289
 290 #ifdef HAVE_LDAP
 291         cprintf("1\n"); /* 1 = yes, this server is LDAP-enabled */
 292 #else
 293         cprintf("0\n"); /* 1 = no, this server is not LDAP-enabled */
 294 #endif
 295
 296         if (config.c_auth_mode == AUTHMODE_NATIVE) {
 297                 cprintf("%d\n", config.c_disable_newu);
 298         }
 299         else {
 300                 cprintf("1\n"); /* "create new user" does not work with non-native auth modes */
 301         }
 302
 303         cprintf("%s\n", config.c_default_cal_zone);
 304
 305         /* Output load averages */
 306         cprintf("%f\n", CtdlThreadLoadAvg);
 307         cprintf("%f\n", CtdlThreadWorkerAvg);
 308         cprintf("%d\n", CtdlThreadGetCount());
 309
 310         /* Does this server support Sieve mail filtering? */
 311 #ifdef HAVE_LIBSIEVE
 312         cprintf("1\n");         /* yes */
 313 #else
 314         cprintf("0\n");         /* no */
 315 #endif
 316
 317         cprintf("000\n");
 318 }
 319
 320
 321 /*
 322  * returns an asterisk if there are any instant messages waiting,
 323  * space otherwise.
 324  */
 325 char CtdlCheckExpress(void) {
 326         if (CC->FirstExpressMessage == NULL) {
 327                 return(' ');
 328         }
 329         else {
 330                 return('*');
 331         }
 332 }
 333
 334 void cmd_time(void)
 335 {
 336    time_t tv;
 337    struct tm tmp;
 338
 339    tv = time(NULL);
 340    localtime_r(&tv, &tmp);
 341
 342    /* timezone and daylight global variables are not portable. */
 343 #ifdef HAVE_STRUCT_TM_TM_GMTOFF
 344    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, tmp.tm_gmtoff, tmp.tm_isdst);
 345 #else
 346    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, timezone, tmp.tm_isdst);
 347 #endif
 348 }
 349
 350
 351 /*
 352  * Check originating host against the public_clients file.  This determines
 353  * whether the client is allowed to change the hostname for this session
 354  * (for example, to show the location of the user rather than the location
 355  * of the client).
 356  */
 357 int is_public_client(void)
 358 {
 359         char buf[1024];
 360         char addrbuf[1024];
 361         FILE *fp;
 362         int i;
 363         struct stat statbuf;
 364         static time_t pc_timestamp = 0;
 365         static char public_clients[SIZ];
 366         static char public_clients_file[SIZ];
 367
 368         snprintf(public_clients_file,
 369                          sizeof public_clients_file,
 370                          "%s/public_clients",
 371                          ctdl_etc_dir);
 372
 373         /*
 374          * Check the time stamp on the public_clients file.  If it's been
 375          * updated since the last time we were here (or if this is the first
 376          * time we've been through the loop), read its contents and learn
 377          * the IP addresses of the listed hosts.
 378          */
 379         if (stat(public_clients_file, &statbuf) != 0) {
 380                 /* No public_clients file exists, so bail out */
 381                 lprintf(CTDL_WARNING, "Warning: '%s' does not exist\n",
 382                                 public_clients_file);
 383                 return(0);
 384         }
 385
 386         if (statbuf.st_mtime > pc_timestamp) {
 387                 begin_critical_section(S_PUBLIC_CLIENTS);
 388                 lprintf(CTDL_INFO, "Loading %s\n", public_clients_file);
 389
 390                 safestrncpy(public_clients, "127.0.0.1", sizeof public_clients);
 391                 if (hostname_to_dotted_quad(addrbuf, config.c_fqdn) == 0) {
 392                         strcat(public_clients, "|");
 393                         strcat(public_clients, addrbuf);
 394                 }
 395
 396                 fp = fopen(public_clients_file, "r");
 397                 if (fp != NULL) while (fgets(buf, sizeof buf, fp)!=NULL) {
 398                         char *ptr;
 399                         ptr = buf;
 400                         while (!IsEmptyStr(ptr)) {
 401                                 if (*ptr == '#') {
 402                                         *ptr = 0;
 403                                         break;
 404                                 }
 405                                 else ptr++;
 406                         }
 407                         ptr--;
 408                         while (ptr>buf && isspace(*ptr)) {
 409                                 *(ptr--) = 0;
 410                         }
 411                         if (hostname_to_dotted_quad(addrbuf, buf) == 0) {
 412                                 if ((strlen(public_clients) +
 413                                    strlen(addrbuf) + 2)
 414                                    < sizeof(public_clients)) {
 415                                         strcat(public_clients, "|");
 416                                         strcat(public_clients, addrbuf);
 417                                 }
 418                         }
 419                 }
 420                 fclose(fp);
 421                 pc_timestamp = time(NULL);
 422                 end_critical_section(S_PUBLIC_CLIENTS);
 423         }
 424
 425         lprintf(CTDL_DEBUG, "Checking whether %s is a local or public client\n",
 426                 CC->cs_addr);
 427         for (i=0; i<num_parms(public_clients); ++i) {
 428                 extract_token(addrbuf, public_clients, i, '|', sizeof addrbuf);
 429                 if (!strcasecmp(CC->cs_addr, addrbuf)) {
 430                         lprintf(CTDL_DEBUG, "... yes it is.\n");
 431                         return(1);
 432                 }
 433         }
 434
 435         /* No hits.  This is not a public client. */
 436         lprintf(CTDL_DEBUG, "... no it isn't.\n");
 437         return(0);
 438 }
 439
 440
 441 /*
 442  * the client is identifying itself to the server
 443  */
 444 void cmd_iden(char *argbuf)
 445 {
 446         int dev_code;
 447         int cli_code;
 448         int rev_level;
 449         char desc[128];
 450         char from_host[128];
 451         struct in_addr addr;
 452         int do_lookup = 0;
 453
 454         if (num_parms(argbuf)<4) {
 455                 cprintf("%d usage error\n", ERROR + ILLEGAL_VALUE);
 456                 return;
 457         }
 458
 459         dev_code = extract_int(argbuf,0);
 460         cli_code = extract_int(argbuf,1);
 461         rev_level = extract_int(argbuf,2);
 462         extract_token(desc, argbuf, 3, '|', sizeof desc);
 463
 464         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 465         from_host[sizeof from_host - 1] = 0;
 466         if (num_parms(argbuf)>=5) extract_token(from_host, argbuf, 4, '|', sizeof from_host);
 467
 468         CC->cs_clientdev = dev_code;
 469         CC->cs_clienttyp = cli_code;
 470         CC->cs_clientver = rev_level;
 471         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 472         CC->cs_clientname[31] = 0;
 473
 474         if (!IsEmptyStr(from_host)) {
 475                 if (CC->is_local_socket) do_lookup = 1;
 476                 else if (is_public_client()) do_lookup = 1;
 477         }
 478
 479         if (do_lookup) {
 480                 lprintf(CTDL_DEBUG, "Looking up hostname '%s'\n", from_host);
 481                 if ((addr.s_addr = inet_addr(from_host)) != -1) {
 482                         locate_host(CC->cs_host, sizeof CC->cs_host,
 483                                 CC->cs_addr, sizeof CC->cs_addr,
 484                                 &addr);
 485                 }
 486                 else {
 487                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 488                         CC->cs_host[sizeof CC->cs_host - 1] = 0;
 489                 }
 490         }
 491
 492         lprintf(CTDL_NOTICE, "Client %d/%d/%01d.%02d (%s) from %s\n",
 493                 dev_code,
 494                 cli_code,
 495                 (rev_level / 100),
 496                 (rev_level % 100),
 497                 desc,
 498                 CC->cs_host);
 499         cprintf("%d Ok\n",CIT_OK);
 500 }
 501
 502
 503 /*
 504  * display system messages or help
 505  */
 506 void cmd_mesg(char *mname)
 507 {
 508         FILE *mfp;
 509         char targ[256];
 510         char buf[256];
 511         char buf2[256];
 512         char *dirs[2];
 513         DIR *dp;
 514         struct dirent *d;
 515
 516         extract_token(buf, mname, 0, '|', sizeof buf);
 517
 518         dirs[0] = strdup(ctdl_message_dir);
 519         dirs[1] = strdup(ctdl_hlp_dir);
 520
 521         snprintf(buf2, sizeof buf2, "%s.%d.%d",
 522                 buf, CC->cs_clientdev, CC->cs_clienttyp);
 523
 524         /* If the client requested "?" then produce a listing */
 525         if (!strcmp(buf, "?")) {
 526                 cprintf("%d %s\n", LISTING_FOLLOWS, buf);
 527                 dp = opendir(dirs[1]);
 528                 if (dp != NULL) {
 529                         while (d = readdir(dp), d != NULL) {
 530                                 if (d->d_name[0] != '.') {
 531                                         cprintf(" %s\n", d->d_name);
 532                                 }
 533                         }
 534                         closedir(dp);
 535                 }
 536                 cprintf("000\n");
 537                 free(dirs[0]);
 538                 free(dirs[1]);
 539                 return;
 540         }
 541
 542         /* Otherwise, look for the requested file by name. */
 543         else {
 544                 mesg_locate(targ, sizeof targ, buf2, 2, (const char **)dirs);
 545                 if (IsEmptyStr(targ)) {
 546                         snprintf(buf2, sizeof buf2, "%s.%d",
 547                                                         buf, CC->cs_clientdev);
 548                         mesg_locate(targ, sizeof targ, buf2, 2,
 549                                                         (const char **)dirs);
 550                         if (IsEmptyStr(targ)) {
 551                                 mesg_locate(targ, sizeof targ, buf, 2,
 552                                                         (const char **)dirs);
 553                         }
 554                 }
 555         }
 556
 557         free(dirs[0]);
 558         free(dirs[1]);
 559
 560         if (IsEmptyStr(targ)) {
 561                 cprintf("%d '%s' not found.  (Searching in %s and %s)\n",
 562                         ERROR + FILE_NOT_FOUND,
 563                         mname,
 564                         ctdl_message_dir,
 565                         ctdl_hlp_dir
 566                 );
 567                 return;
 568         }
 569
 570         mfp = fopen(targ, "r");
 571         if (mfp==NULL) {
 572                 cprintf("%d Cannot open '%s': %s\n",
 573                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
 574                 return;
 575         }
 576         cprintf("%d %s\n", LISTING_FOLLOWS,buf);
 577
 578         while (fgets(buf, (sizeof buf - 1), mfp) != NULL) {
 579                 buf[strlen(buf)-1] = 0;
 580                 do_help_subst(buf);
 581                 cprintf("%s\n",buf);
 582         }
 583
 584         fclose(mfp);
 585         cprintf("000\n");
 586 }
 587
 588
 589 /*
 590  * enter system messages or help
 591  */
 592 void cmd_emsg(char *mname)
 593 {
 594         FILE *mfp;
 595         char targ[256];
 596         char buf[256];
 597         char *dirs[2];
 598         int a;
 599
 600         unbuffer_output();
 601
 602         if (CtdlAccessCheck(ac_aide)) return;
 603
 604         extract_token(buf, mname, 0, '|', sizeof buf);
 605         for (a=0; !IsEmptyStr(&buf[a]); ++a) {          /* security measure */
 606                 if (buf[a] == '/') buf[a] = '.';
 607         }
 608
 609         dirs[0] = strdup(ctdl_message_dir);
 610         dirs[1] = strdup(ctdl_hlp_dir);
 611
 612         mesg_locate(targ, sizeof targ, buf, 2, (const char**)dirs);
 613         free(dirs[0]);
 614         free(dirs[1]);
 615
 616         if (IsEmptyStr(targ)) {
 617                 snprintf(targ, sizeof targ,
 618                                  "%s/%s",
 619                                  ctdl_hlp_dir, buf);
 620         }
 621
 622         mfp = fopen(targ,"w");
 623         if (mfp==NULL) {
 624                 cprintf("%d Cannot open '%s': %s\n",
 625                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
 626                 return;
 627         }
 628         cprintf("%d %s\n", SEND_LISTING, targ);
 629
 630         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 631                 fprintf(mfp, "%s\n", buf);
 632         }
 633
 634         fclose(mfp);
 635 }
 636
 637
 638 /* Don't show the names of private rooms unless the viewing
 639  * user also knows the rooms.
 640  */
 641 void GenerateRoomDisplay(char *real_room,
 642                         struct CitContext *viewed,
 643                         struct CitContext *viewer) {
 644
 645         int ra;
 646
 647         strcpy(real_room, viewed->room.QRname);
 648         if (viewed->room.QRflags & QR_MAILBOX) {
 649                 strcpy(real_room, &real_room[11]);
 650         }
 651         if (viewed->room.QRflags & QR_PRIVATE) {
 652                 CtdlRoomAccess(&viewed->room, &viewer->user, &ra, NULL);
 653                 if ( (ra & UA_KNOWN) == 0) {
 654                         strcpy(real_room, "<private room>");
 655                 }
 656         }
 657
 658         if (viewed->cs_flags & CS_CHAT) {
 659                 while (strlen(real_room) < 14)
 660                         strcat(real_room, " ");
 661
 662                 strcpy(&real_room[14], "<chat>");
 663         }
 664
 665 }
 666
 667 /*
 668  * Convenience function.
 669  */
 670 int CtdlAccessCheck(int required_level) {
 671
 672         if (CC->internal_pgm) return(0);
 673         if (required_level >= ac_internal) {
 674                 cprintf("%d This is not a user-level command.\n",
 675                         ERROR + HIGHER_ACCESS_REQUIRED);
 676                 return(-1);
 677         }
 678
 679         if ((required_level >= ac_logged_in) && (CC->logged_in == 0)) {
 680                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 681                 return(-1);
 682         }
 683
 684         if (CC->user.axlevel >= 6) return(0);
 685         if (required_level >= ac_aide) {
 686                 cprintf("%d This command requires Aide access.\n",
 687                         ERROR + HIGHER_ACCESS_REQUIRED);
 688                 return(-1);
 689         }
 690
 691         if (is_room_aide()) return(0);
 692         if (required_level >= ac_room_aide) {
 693                 cprintf("%d This command requires Aide or Room Aide access.\n",
 694                         ERROR + HIGHER_ACCESS_REQUIRED);
 695                 return(-1);
 696         }
 697
 698         /* shhh ... succeed quietly */
 699         return(0);
 700 }
 701
 702
 703
 704 /*
 705  * Terminate another running session
 706  */
 707 void cmd_term(char *cmdbuf)
 708 {
 709         int session_num;
 710         struct CitContext *ccptr;
 711         int found_it = 0;
 712         int allowed = 0;
 713
 714         session_num = extract_int(cmdbuf, 0);
 715         if (session_num == CC->cs_pid) {
 716                 cprintf("%d You can't kill your own session.\n", ERROR + ILLEGAL_VALUE);
 717                 return;
 718         }
 719
 720         lprintf(CTDL_DEBUG, "Locating session to kill\n");
 721         begin_critical_section(S_SESSION_TABLE);
 722         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 723                 if (session_num == ccptr->cs_pid) {
 724                         found_it = 1;
 725                         if ((ccptr->user.usernum == CC->user.usernum)
 726                            || (CC->user.axlevel >= 6)) {
 727                                 allowed = 1;
 728                                 ccptr->kill_me = 1;
 729                         }
 730                         else {
 731                                 allowed = 0;
 732                         }
 733                 }
 734         }
 735         end_critical_section(S_SESSION_TABLE);
 736
 737         if (found_it) {
 738                 if (allowed) {
 739                         cprintf("%d Session terminated.\n", CIT_OK);
 740                 }
 741                 else {
 742                         cprintf("%d You are not allowed to do that.\n",
 743                                 ERROR + HIGHER_ACCESS_REQUIRED);
 744                 }
 745         }
 746         else {
 747                 cprintf("%d No such session.\n", ERROR + ILLEGAL_VALUE);
 748         }
 749 }
 750
 751
 752
 753
 754
 755 /*
 756  * get the paginator prompt
 757  */
 758 void cmd_more(void) {
 759         cprintf("%d %s\n", CIT_OK, config.c_moreprompt);
 760 }
 761
 762 /*
 763  * echo
 764  */
 765 void cmd_echo(char *etext)
 766 {
 767         cprintf("%d %s\n", CIT_OK, etext);
 768 }
 769
 770
 771
 772 /*
 773  * identify as internal program
 774  */
 775 void cmd_ipgm(char *argbuf)
 776 {
 777         int secret;
 778
 779         secret = extract_int(argbuf, 0);
 780
 781         /* For security reasons, we do NOT allow this command to run
 782          * over the network.  Local sockets only.
 783          */
 784         if (!CC->is_local_socket) {
 785                 sleep(5);
 786                 cprintf("%d Authentication failed.\n",
 787                         ERROR + PASSWORD_REQUIRED);
 788         }
 789         else if (secret == config.c_ipgm_secret) {
 790                 CC->internal_pgm = 1;
 791                 strcpy(CC->curr_user, "<internal program>");
 792                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 793                 cprintf("%d Authenticated as an internal program.\n", CIT_OK);
 794         }
 795         else {
 796                 sleep(5);
 797                 cprintf("%d Authentication failed.\n",
 798                         ERROR + PASSWORD_REQUIRED);
 799                 lprintf(CTDL_ERR, "Warning: ipgm authentication failed.\n");
 800                 CC->kill_me = 1;
 801         }
 802
 803         /* Now change the ipgm secret for the next round.
 804          * (Disabled because it breaks concurrent scripts.  The fact that
 805          * we no longer accept IPGM over the network should be sufficient
 806          * to prevent brute-force attacks.  If you don't agree, uncomment
 807          * this block.)
 808         get_config();
 809         config.c_ipgm_secret = rand();
 810         put_config();
 811         */
 812 }
 813
 814
 815 /*
 816  * Shut down the server
 817  */
 818 void cmd_down(char *argbuf) {
 819         char *Reply ="%d Shutting down server.  Goodbye.\n";
 820
 821         if (CtdlAccessCheck(ac_aide)) return;
 822
 823         if (!IsEmptyStr(argbuf))
 824         {
 825                 int state = CIT_OK;
 826                 restart_server = extract_int(argbuf, 0);
 827
 828                 if (restart_server > 0)
 829                         Reply = "%d Restarting server.  See you soon.\n";
 830                 if ((restart_server > 0) && !running_as_daemon)
 831                 {
 832                         lprintf(CTDL_ERR, "The user requested restart, but not running as deamon! Geronimooooooo!\n");
 833                         Reply = "%d Warning, not running in deamon mode. maybe we will come up again, but don't lean on it.\n";
 834                         state = ERROR;
 835                 }
 836                 cprintf(Reply, state);
 837         }
 838         else
 839         {
 840                 cprintf(Reply, CIT_OK + SERVER_SHUTTING_DOWN);
 841         }
 842         CtdlThreadStopAll();
 843 }
 844
 845 /*
 846  * Halt the server without exiting the server process.
 847  */
 848 void cmd_halt(void) {
 849
 850         if (CtdlAccessCheck(ac_aide)) return;
 851
 852         cprintf("%d Halting server.  Goodbye.\n", CIT_OK);
 853         CtdlThreadStopAll();
 854         shutdown_and_halt = 1;
 855 }
 856
 857 /*
 858  * Schedule or cancel a server shutdown
 859  */
 860 void cmd_scdn(char *argbuf)
 861 {
 862         int new_state;
 863         int state = CIT_OK;
 864         char *Reply = "%d %d\n";
 865
 866         if (CtdlAccessCheck(ac_aide)) return;
 867
 868         new_state = extract_int(argbuf, 0);
 869         if ((new_state == 2) || (new_state == 3))
 870         {
 871                 restart_server = 1;
 872                 if (!running_as_daemon)
 873                 {
 874                         lprintf(CTDL_ERR, "The user requested restart, but not running as deamon! Geronimooooooo!\n");
 875                         Reply = "%d %d Warning, not running in deamon mode. maybe we will come up again, but don't lean on it.\n";
 876                         state = ERROR;
 877                 }
 878
 879                 restart_server = extract_int(argbuf, 0);
 880                 new_state -= 2;
 881         }
 882         if ((new_state == 0) || (new_state == 1)) {
 883                 ScheduledShutdown = new_state;
 884         }
 885         cprintf(Reply, state, ScheduledShutdown);
 886 }
 887
 888
 889 /*
 890  * Set or unset asynchronous protocol mode
 891  */
 892 void cmd_asyn(char *argbuf)
 893 {
 894         int new_state;
 895
 896         new_state = extract_int(argbuf, 0);
 897         if ((new_state == 0) || (new_state == 1)) {
 898                 CC->is_async = new_state;
 899         }
 900         cprintf("%d %d\n", CIT_OK, CC->is_async);
 901 }
 902
 903
 904 /*
 905  * Generate a "nonce" for APOP-style authentication.
 906  *
 907  * RFC 1725 et al specify a PID to be placed in front of the nonce.
 908  * Quoth BTX: That would be stupid.
 909  */
 910 void generate_nonce(struct CitContext *con) {
 911         struct timeval tv;
 912
 913         memset(con->cs_nonce, NONCE_SIZE, 0);
 914         gettimeofday(&tv, NULL);
 915         memset(con->cs_nonce, NONCE_SIZE, 0);
 916         snprintf(con->cs_nonce, NONCE_SIZE, "<%d%ld@%s>",
 917                 rand(), (long)tv.tv_usec, config.c_fqdn);
 918 }
 919
 920
 921
 922
 923 /*
 924  * Back-end function for starting a session
 925  */
 926 void begin_session(struct CitContext *con)
 927 {
 928         socklen_t len;
 929         struct sockaddr_in sin;
 930
 931         /*
 932          * Initialize some variables specific to our context.
 933          */
 934         con->logged_in = 0;
 935         con->internal_pgm = 0;
 936         con->download_fp = NULL;
 937         con->upload_fp = NULL;
 938         con->FirstExpressMessage = NULL;
 939         time(&con->lastcmd);
 940         time(&con->lastidle);
 941         strcpy(con->lastcmdname, "    ");
 942         strcpy(con->cs_clientname, "(unknown)");
 943         strcpy(con->curr_user, NLI);
 944         *con->net_node = '\0';
 945         *con->fake_username = '\0';
 946         *con->fake_hostname = '\0';
 947         *con->fake_roomname = '\0';
 948         generate_nonce(con);
 949         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 950         safestrncpy(con->cs_addr, "", sizeof con->cs_addr);
 951         con->cs_host[sizeof con->cs_host - 1] = 0;
 952         len = sizeof sin;
 953         if (!CC->is_local_socket) {
 954                 if (!getpeername(con->client_socket, (struct sockaddr *) &sin, &len)) {
 955                         locate_host(con->cs_host, sizeof con->cs_host,
 956                                 con->cs_addr, sizeof con->cs_addr,
 957                                 &sin.sin_addr
 958                         );
 959                 }
 960         }
 961         else {
 962                 strcpy(con->cs_host, "");
 963         }
 964         con->cs_flags = 0;
 965         con->upload_type = UPL_FILE;
 966         con->dl_is_net = 0;
 967
 968         con->nologin = 0;
 969         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions)) {
 970                 con->nologin = 1;
 971         }
 972
 973         lprintf(CTDL_NOTICE, "Session started.\n");
 974
 975         /* Run any session startup routines registered by loadable modules */
 976         PerformSessionHooks(EVT_START);
 977 }
 978
 979
 980 void citproto_begin_session() {
 981         if (CC->nologin==1) {
 982                 cprintf("%d %s: Too many users are already online (maximum is %d)\n",
 983                         ERROR + MAX_SESSIONS_EXCEEDED,
 984                         config.c_nodename, config.c_maxsessions
 985                 );
 986                 CC->kill_me = 1;
 987         }
 988         else {
 989                 cprintf("%d %s Citadel server ready.\n",
 990                         CIT_OK, config.c_nodename);
 991         }
 992 }
 993
 994
 995
 996
 997 /*
 998  * This loop recognizes all server commands.
 999  */
1000 void do_command_loop(void) {
1001         char cmdbuf[SIZ];
1002         const char *old_name = NULL;
1003
1004         old_name = CtdlThreadName("do_command_loop");
1005
1006         time(&CC->lastcmd);
1007         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
1008         if (client_getln(cmdbuf, sizeof cmdbuf) < 1) {
1009                 lprintf(CTDL_ERR, "Client disconnected: ending session.\n");
1010                 CC->kill_me = 1;
1011                 CtdlThreadName(old_name);
1012                 return;
1013         }
1014
1015         /* Log the server command, but don't show passwords... */
1016         if ( (strncasecmp(cmdbuf, "PASS", 4))
1017            && (strncasecmp(cmdbuf, "SETP", 4)) ) {
1018                 lprintf(CTDL_INFO, "%s\n", cmdbuf);
1019         }
1020         else {
1021                 lprintf(CTDL_INFO, "<password command sent>\n");
1022         }
1023
1024         buffer_output();
1025
1026         /*
1027          * Let other clients see the last command we executed, and
1028          * update the idle time, but not NOOP, QNOP, PEXP, GEXP, RWHO, or TIME.
1029          */
1030         if ( (strncasecmp(cmdbuf, "NOOP", 4))
1031            && (strncasecmp(cmdbuf, "QNOP", 4))
1032            && (strncasecmp(cmdbuf, "PEXP", 4))
1033            && (strncasecmp(cmdbuf, "GEXP", 4))
1034            && (strncasecmp(cmdbuf, "RWHO", 4))
1035            && (strncasecmp(cmdbuf, "TIME", 4)) ) {
1036                 strcpy(CC->lastcmdname, "    ");
1037                 safestrncpy(CC->lastcmdname, cmdbuf, sizeof(CC->lastcmdname));
1038                 time(&CC->lastidle);
1039         }
1040
1041         CtdlThreadName(cmdbuf);
1042
1043         if ((strncasecmp(cmdbuf, "ENT0", 4))
1044            && (strncasecmp(cmdbuf, "MESG", 4))
1045            && (strncasecmp(cmdbuf, "MSGS", 4)))
1046         {
1047            CC->cs_flags &= ~CS_POSTING;
1048         }
1049
1050         if (!strncasecmp(cmdbuf, "NOOP", 4)) {
1051                 cprintf("%d%cok\n", CIT_OK, CtdlCheckExpress() );
1052         }
1053
1054         else if (!strncasecmp(cmdbuf, "QNOP", 4)) {
1055                 /* do nothing, this command returns no response */
1056         }
1057
1058         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
1059                 cprintf("%d Goodbye.\n", CIT_OK);
1060                 CC->kill_me = 1;
1061         }
1062
1063         else if (!strncasecmp(cmdbuf,"ASYN",4)) {
1064                 cmd_asyn(&cmdbuf[5]);
1065         }
1066
1067         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
1068                 if (CC->logged_in) logout(CC);
1069                 cprintf("%d logged out.\n", CIT_OK);
1070         }
1071
1072         else if (!strncasecmp(cmdbuf,"USER",4)) {
1073                 cmd_user(&cmdbuf[5]);
1074         }
1075
1076         else if (!strncasecmp(cmdbuf,"PASS",4)) {
1077                 cmd_pass(&cmdbuf[5]);
1078         }
1079
1080         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
1081                 cmd_newu(&cmdbuf[5]);
1082         }
1083
1084         else if (!strncasecmp(cmdbuf,"CREU",4)) {
1085                 cmd_creu(&cmdbuf[5]);
1086         }
1087
1088         else if (!strncasecmp(cmdbuf,"SETP",4)) {
1089                 cmd_setp(&cmdbuf[5]);
1090         }
1091
1092         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
1093                 cmd_lrms(&cmdbuf[5]);
1094         }
1095
1096         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
1097                 cmd_lkra(&cmdbuf[5]);
1098         }
1099
1100         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
1101                 cmd_lkrn(&cmdbuf[5]);
1102         }
1103
1104         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
1105                 cmd_lkro(&cmdbuf[5]);
1106         }
1107
1108         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
1109                 cmd_lzrm(&cmdbuf[5]);
1110         }
1111
1112         else if (!strncasecmp(cmdbuf,"LPRM",4)) {
1113                 cmd_lprm(&cmdbuf[5]);
1114         }
1115
1116         else if (!strncasecmp(cmdbuf,"GETU",4)) {
1117                 cmd_getu();
1118         }
1119
1120         else if (!strncasecmp(cmdbuf,"SETU",4)) {
1121                 cmd_setu(&cmdbuf[5]);
1122         }
1123
1124         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
1125                 cmd_goto(&cmdbuf[5]);
1126         }
1127
1128         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
1129                 cmd_msgs(&cmdbuf[5]);
1130         }
1131
1132         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
1133                 cmd_whok();
1134         }
1135
1136         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
1137                 cmd_rdir();
1138         }
1139
1140         else if (!strncasecmp(cmdbuf,"EUID",4)) {
1141                 cmd_euid(&cmdbuf[5]);
1142         }
1143
1144         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
1145                 cmd_msg0(&cmdbuf[5]);
1146         }
1147
1148         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
1149                 cmd_msg2(&cmdbuf[5]);
1150         }
1151
1152         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
1153                 cmd_msg3(&cmdbuf[5]);
1154         }
1155
1156         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
1157                 cmd_msg4(&cmdbuf[5]);
1158         }
1159
1160         else if (!strncasecmp(cmdbuf,"MSGP",4)) {
1161                 cmd_msgp(&cmdbuf[5]);
1162         }
1163
1164         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
1165                 cmd_opna(&cmdbuf[5]);
1166         }
1167
1168         else if (!strncasecmp(cmdbuf,"DLAT",4)) {
1169                 cmd_dlat(&cmdbuf[5]);
1170         }
1171
1172         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1173                 cmd_info();
1174         }
1175
1176         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1177                 cmd_slrp(&cmdbuf[5]);
1178         }
1179
1180         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1181                 cmd_invt_kick(&cmdbuf[5],1);
1182         }
1183
1184         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1185                 cmd_invt_kick(&cmdbuf[5],0);
1186         }
1187
1188         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1189                 cmd_getr();
1190         }
1191
1192         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1193                 cmd_setr(&cmdbuf[5]);
1194         }
1195
1196         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1197                 cmd_geta();
1198         }
1199
1200         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1201                 cmd_seta(&cmdbuf[5]);
1202         }
1203
1204         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1205                 cmd_ent0(&cmdbuf[5]);
1206         }
1207
1208         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1209                 cmd_rinf();
1210         }
1211
1212         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1213                 cmd_dele(&cmdbuf[5]);
1214         }
1215
1216         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1217                 cmd_kill(&cmdbuf[5]);
1218         }
1219
1220         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1221                 cmd_cre8(&cmdbuf[5]);
1222         }
1223
1224         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1225                 cmd_move(&cmdbuf[5]);
1226         }
1227
1228         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1229                 cmd_forg();
1230         }
1231
1232         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1233                 cmd_mesg(&cmdbuf[5]);
1234         }
1235
1236         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1237                 cmd_emsg(&cmdbuf[5]);
1238         }
1239
1240         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1241                 cmd_gnur();
1242         }
1243
1244         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1245                 cmd_vali(&cmdbuf[5]);
1246         }
1247
1248         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1249                 cmd_einf(&cmdbuf[5]);
1250         }
1251
1252         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1253                 cmd_list(&cmdbuf[5]);
1254         }
1255
1256         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1257                 cmd_chek();
1258         }
1259
1260         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1261                 cmd_delf(&cmdbuf[5]);
1262         }
1263
1264         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1265                 cmd_movf(&cmdbuf[5]);
1266         }
1267
1268         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1269                 cmd_netf(&cmdbuf[5]);
1270         }
1271
1272         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1273                 cmd_open(&cmdbuf[5]);
1274         }
1275
1276         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1277                 cmd_clos();
1278         }
1279
1280         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1281                 cmd_uopn(&cmdbuf[5]);
1282         }
1283
1284         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1285                 cmd_ucls(&cmdbuf[5]);
1286         }
1287
1288         else if (!strncasecmp(cmdbuf,"READ",4)) {
1289                 cmd_read(&cmdbuf[5]);
1290         }
1291
1292         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1293                 cmd_writ(&cmdbuf[5]);
1294         }
1295
1296         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1297                 cmd_qusr(&cmdbuf[5]);
1298         }
1299
1300         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1301                 cmd_echo(&cmdbuf[5]);
1302         }
1303
1304         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1305                 cmd_oimg(&cmdbuf[5]);
1306         }
1307
1308         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1309                 cmd_more();
1310         }
1311
1312         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1313                 cmd_ndop(&cmdbuf[5]);
1314         }
1315
1316         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1317                 cmd_nuop(&cmdbuf[5]);
1318         }
1319
1320         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1321                 cmd_lflr();
1322         }
1323
1324         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1325                 cmd_cflr(&cmdbuf[5]);
1326         }
1327
1328         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1329                 cmd_kflr(&cmdbuf[5]);
1330         }
1331
1332         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1333                 cmd_eflr(&cmdbuf[5]);
1334         }
1335
1336         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1337                 cmd_iden(&cmdbuf[5]);
1338         }
1339
1340         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1341                 cmd_ipgm(&cmdbuf[5]);
1342         }
1343
1344         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1345                 cmd_term(&cmdbuf[5]);
1346         }
1347
1348         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1349                 cmd_down(&cmdbuf[5]);
1350         }
1351
1352         else if (!strncasecmp(cmdbuf,"HALT",4)) {
1353                 cmd_halt();
1354         }
1355
1356         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1357                 cmd_scdn(&cmdbuf[5]);
1358         }
1359
1360         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1361                 cmd_uimg(&cmdbuf[5]);
1362         }
1363
1364         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1365                 cmd_time();
1366         }
1367
1368         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1369                 cmd_agup(&cmdbuf[5]);
1370         }
1371
1372         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1373                 cmd_asup(&cmdbuf[5]);
1374         }
1375
1376         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1377                 cmd_gpex(&cmdbuf[5]);
1378         }
1379
1380         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1381                 cmd_spex(&cmdbuf[5]);
1382         }
1383
1384         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1385                 cmd_conf(&cmdbuf[5]);
1386         }
1387
1388         else if (!strncasecmp(cmdbuf, "SEEN", 4)) {
1389                 cmd_seen(&cmdbuf[5]);
1390         }
1391
1392         else if (!strncasecmp(cmdbuf, "GTSN", 4)) {
1393                 cmd_gtsn(&cmdbuf[5]);
1394         }
1395
1396         else if (!strncasecmp(cmdbuf, "VIEW", 4)) {
1397                 cmd_view(&cmdbuf[5]);
1398         }
1399
1400         else if (!strncasecmp(cmdbuf, "ISME", 4)) {
1401                 cmd_isme(&cmdbuf[5]);
1402         }
1403
1404         else if (!DLoader_Exec_Cmd(cmdbuf)) {
1405                 cprintf("%d Unrecognized or unsupported command.\n",
1406                         ERROR + CMD_NOT_SUPPORTED);
1407                }
1408
1409         unbuffer_output();
1410
1411         /* Run any after-each-command routines registered by modules */
1412         PerformSessionHooks(EVT_CMD);
1413         CtdlThreadName(old_name);
1414 }
1415
1416
1417 /*
1418  * This loop performs all asynchronous functions.
1419  */
1420 void do_async_loop(void) {
1421         PerformSessionHooks(EVT_ASYNC);
1422 }