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