citadel/citserver.c

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