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