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 time_t server_startup_time;
  74 int panic_fd;
  75
  76 /**
  77  * \brief print the actual stack frame.
  78  */
  79 void cit_backtrace(void)
  80 {
  81 #ifdef HAVE_BACKTRACE
  82         void *stack_frames[50];
  83         size_t size, i;
  84         char **strings;
  85
  86
  87         size = backtrace(stack_frames, sizeof(stack_frames) / sizeof(void*));
  88         strings = backtrace_symbols(stack_frames, size);
  89         for (i = 0; i < size; i++) {
  90                 if (strings != NULL)
  91                         lprintf(1, "%s\n", strings[i]);
  92                 else
  93                         lprintf(1, "%p\n", stack_frames[i]);
  94         }
  95         free(strings);
  96 #endif
  97 }
  98
  99 /**
 100  * \brief print the actual stack frame.
 101  */
 102 void cit_panic_backtrace(int SigNum)
 103 {
 104 #ifdef HAVE_BACKTRACE
 105         void *stack_frames[10];
 106         size_t size, i;
 107         char **strings;
 108
 109         printf("caught signal 11\n");
 110         size = backtrace(stack_frames, sizeof(stack_frames) / sizeof(void*));
 111         strings = backtrace_symbols(stack_frames, size);
 112         for (i = 0; i < size; i++) {
 113                 if (strings != NULL)
 114                         lprintf(1, "%s\n", strings[i]);
 115                 else
 116                         lprintf(1, "%p\n", stack_frames[i]);
 117         }
 118         free(strings);
 119 #endif
 120         exit(-1);
 121 }
 122
 123 /*
 124  * Various things that need to be initialized at startup
 125  */
 126 void master_startup(void) {
 127         struct timeval tv;
 128         unsigned int seed;
 129         FILE *urandom;
 130         struct ctdlroom qrbuf;
 131
 132         lprintf(CTDL_DEBUG, "master_startup() started\n");
 133         time(&server_startup_time);
 134
 135         lprintf(CTDL_INFO, "Opening databases\n");
 136         open_databases();
 137
 138         ctdl_thread_internal_init_tsd();
 139
 140         CtdlThreadAllocTSD();
 141
 142         check_ref_counts();
 143
 144         lprintf(CTDL_INFO, "Creating base rooms (if necessary)\n");
 145         create_room(config.c_baseroom,  0, "", 0, 1, 0, VIEW_BBS);
 146         create_room(AIDEROOM,           3, "", 0, 1, 0, VIEW_BBS);
 147         create_room(SYSCONFIGROOM,      3, "", 0, 1, 0, VIEW_BBS);
 148         create_room(config.c_twitroom,  0, "", 0, 1, 0, VIEW_BBS);
 149
 150         /* The "Local System Configuration" room doesn't need to be visible */
 151         if (lgetroom(&qrbuf, SYSCONFIGROOM) == 0) {
 152                 qrbuf.QRflags2 |= QR2_SYSTEM;
 153                 lputroom(&qrbuf);
 154         }
 155
 156         /* Aide needs to be public postable, else we're not RFC conformant. */
 157         if (lgetroom(&qrbuf, AIDEROOM) == 0) {
 158                 qrbuf.QRflags2 |= QR2_SMTP_PUBLIC;
 159                 lputroom(&qrbuf);
 160         }
 161
 162         lprintf(CTDL_INFO, "Seeding the pseudo-random number generator...\n");
 163         urandom = fopen("/dev/urandom", "r");
 164         if (urandom != NULL) {
 165                 fread(&seed, sizeof seed, 1, urandom);
 166                 fclose(urandom);
 167         }
 168         else {
 169                 gettimeofday(&tv, NULL);
 170                 seed = tv.tv_usec;
 171         }
 172         srandom(seed);
 173
 174         lprintf(CTDL_INFO, "Initializing ipgm secret\n");
 175         get_config();
 176         config.c_ipgm_secret = rand();
 177         put_config();
 178
 179         lprintf(CTDL_DEBUG, "master_startup() finished\n");
 180 }
 181
 182
 183 /*
 184  * Cleanup routine to be called when the server is shutting down.
 185  */
 186 void master_cleanup(int exitcode) {
 187         struct CleanupFunctionHook *fcn;
 188         static int already_cleaning_up = 0;
 189
 190         if (already_cleaning_up) while(1) sleep(1);
 191         already_cleaning_up = 1;
 192
 193         /* Run any cleanup routines registered by loadable modules */
 194         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
 195                 (*fcn->h_function_pointer)();
 196         }
 197
 198         /* Close the AdjRefCount queue file */
 199         AdjRefCount(-1, 0);
 200
 201         /* Do system-dependent stuff */
 202         sysdep_master_cleanup();
 203
 204         /* Close databases */
 205         lprintf(CTDL_INFO, "Closing databases\n");
 206         close_databases();
 207
 208 #ifdef DEBUG_MEMORY_LEAKS
 209         dump_heap();
 210 #endif
 211
 212         /* If the operator requested a halt but not an exit, halt here. */
 213         if (shutdown_and_halt) {
 214                 lprintf(CTDL_NOTICE, "citserver: Halting server without exiting.\n");
 215                 fflush(stdout); fflush(stderr);
 216                 while(1) {
 217                         sleep(32767);
 218                 }
 219         }
 220
 221         release_control();
 222
 223         /* Now go away. */
 224         lprintf(CTDL_NOTICE, "citserver: Exiting with status %d\n", exitcode);
 225         fflush(stdout); fflush(stderr);
 226
 227         if (restart_server != 0)
 228                 exit(1);
 229         exit(exitcode);
 230 }
 231
 232
 233
 234 /*
 235  * Terminate a session.
 236  */
 237 void RemoveContext (struct CitContext *con)
 238 {
 239         if (con==NULL) {
 240                 lprintf(CTDL_ERR,
 241                         "WARNING: RemoveContext() called with NULL!\n");
 242                 return;
 243         }
 244         lprintf(CTDL_DEBUG, "RemoveContext() session %d\n", con->cs_pid);
 245
 246         /* Run any cleanup routines registered by loadable modules.
 247          * Note: We have to "become_session()" because the cleanup functions
 248          *       might make references to "CC" assuming it's the right one.
 249          */
 250         become_session(con);
 251         PerformSessionHooks(EVT_STOP);
 252         become_session(NULL);
 253
 254         /* Now handle all of the administrivia. */
 255         lprintf(CTDL_DEBUG, "Calling logout(%d)\n", con->cs_pid);
 256         logout(con);
 257
 258         lprintf(CTDL_NOTICE, "[%3d] Session ended.\n", con->cs_pid);
 259
 260         /* If the client is still connected, blow 'em away. */
 261         lprintf(CTDL_DEBUG, "Closing socket %d\n", con->client_socket);
 262         close(con->client_socket);
 263
 264         lprintf(CTDL_DEBUG, "Done with RemoveContext()\n");
 265 }
 266
 267
 268
 269
 270
 271 /*
 272  * cmd_info()  -  tell the client about this server
 273  */
 274 void cmd_info(void) {
 275         cprintf("%d Server info:\n", LISTING_FOLLOWS);
 276         cprintf("%d\n", CC->cs_pid);
 277         cprintf("%s\n", config.c_nodename);
 278         cprintf("%s\n", config.c_humannode);
 279         cprintf("%s\n", config.c_fqdn);
 280         cprintf("%s\n", CITADEL);
 281         cprintf("%d\n", REV_LEVEL);
 282         cprintf("%s\n", config.c_site_location);
 283         cprintf("%s\n", config.c_sysadm);
 284         cprintf("%d\n", SERVER_TYPE);
 285         cprintf("%s\n", config.c_moreprompt);
 286         cprintf("1\n"); /* 1 = yes, this system supports floors */
 287         cprintf("1\n"); /* 1 = we support the extended paging options */
 288         cprintf("%s\n", CC->cs_nonce);
 289         cprintf("1\n"); /* 1 = yes, this system supports the QNOP command */
 290
 291 #ifdef HAVE_LDAP
 292         cprintf("1\n"); /* 1 = yes, this server is LDAP-enabled */
 293 #else
 294         cprintf("0\n"); /* 1 = no, this server is not LDAP-enabled */
 295 #endif
 296
 297         if (config.c_auth_mode == AUTHMODE_NATIVE) {
 298                 cprintf("%d\n", config.c_disable_newu);
 299         }
 300         else {
 301                 cprintf("1\n"); /* "create new user" does not work with non-native auth modes */
 302         }
 303
 304         cprintf("%s\n", config.c_default_cal_zone);
 305
 306         /* Output load averages */
 307         cprintf("%f\n", CtdlThreadLoadAvg);
 308         cprintf("%f\n", CtdlThreadWorkerAvg);
 309         cprintf("%d\n", CtdlThreadGetCount());
 310
 311         /* Does this server support Sieve mail filtering? */
 312 #ifdef HAVE_LIBSIEVE
 313         cprintf("1\n");         /* yes */
 314 #else
 315         cprintf("0\n");         /* no */
 316 #endif
 317
 318         cprintf("000\n");
 319 }
 320
 321
 322 /*
 323  * returns an asterisk if there are any instant messages waiting,
 324  * space otherwise.
 325  */
 326 char CtdlCheckExpress(void) {
 327         if (CC->FirstExpressMessage == NULL) {
 328                 return(' ');
 329         }
 330         else {
 331                 return('*');
 332         }
 333 }
 334
 335 void cmd_time(void)
 336 {
 337    time_t tv;
 338    struct tm tmp;
 339
 340    tv = time(NULL);
 341    localtime_r(&tv, &tmp);
 342
 343    /* timezone and daylight global variables are not portable. */
 344 #ifdef HAVE_STRUCT_TM_TM_GMTOFF
 345    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, tmp.tm_gmtoff, tmp.tm_isdst);
 346 #else
 347    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, timezone, tmp.tm_isdst);
 348 #endif
 349 }
 350
 351
 352 /*
 353  * Check originating host against the public_clients file.  This determines
 354  * whether the client is allowed to change the hostname for this session
 355  * (for example, to show the location of the user rather than the location
 356  * of the client).
 357  */
 358 int is_public_client(void)
 359 {
 360         char buf[1024];
 361         char addrbuf[1024];
 362         FILE *fp;
 363         int i;
 364         char *public_clientspos;
 365         char *public_clientsend;
 366         char *paddr = NULL;
 367         struct stat statbuf;
 368         static time_t pc_timestamp = 0;
 369         static char public_clients[SIZ];
 370         static char public_clients_file[SIZ];
 371
 372 #define LOCALHOSTSTR "127.0.0.1"
 373
 374         snprintf(public_clients_file,
 375                          sizeof public_clients_file,
 376                          "%s/public_clients",
 377                          ctdl_etc_dir);
 378
 379         /*
 380          * Check the time stamp on the public_clients file.  If it's been
 381          * updated since the last time we were here (or if this is the first
 382          * time we've been through the loop), read its contents and learn
 383          * the IP addresses of the listed hosts.
 384          */
 385         if (stat(public_clients_file, &statbuf) != 0) {
 386                 /* No public_clients file exists, so bail out */
 387                 lprintf(CTDL_WARNING, "Warning: '%s' does not exist\n",
 388                                 public_clients_file);
 389                 return(0);
 390         }
 391
 392         if (statbuf.st_mtime > pc_timestamp) {
 393                 begin_critical_section(S_PUBLIC_CLIENTS);
 394                 lprintf(CTDL_INFO, "Loading %s\n", public_clients_file);
 395
 396                 public_clientspos = &public_clients[0];
 397                 public_clientsend = public_clientspos + SIZ;
 398                 safestrncpy(public_clientspos, LOCALHOSTSTR, sizeof public_clients);
 399                 public_clientspos += sizeof(LOCALHOSTSTR) - 1;
 400
 401                 if (hostname_to_dotted_quad(addrbuf, config.c_fqdn) == 0) {
 402                         *(public_clientspos++) = '|';
 403                         paddr = &addrbuf[0];
 404                         while (!IsEmptyStr (paddr) &&
 405                                (public_clientspos < public_clientsend))
 406                                 *(public_clientspos++) = *(paddr++);
 407                 }
 408
 409                 fp = fopen(public_clients_file, "r");
 410                 if (fp != NULL)
 411                         while ((fgets(buf, sizeof buf, fp)!=NULL) &&
 412                                (public_clientspos < public_clientsend)){
 413                                 char *ptr;
 414                                 ptr = buf;
 415                                 while (!IsEmptyStr(ptr)) {
 416                                         if (*ptr == '#') {
 417                                                 *ptr = 0;
 418                                                 break;
 419                                         }
 420                                 else ptr++;
 421                                 }
 422                                 ptr--;
 423                                 while (ptr>buf && isspace(*ptr)) {
 424                                         *(ptr--) = 0;
 425                                 }
 426                                 if (hostname_to_dotted_quad(addrbuf, buf) == 0) {
 427                                         *(public_clientspos++) = '|';
 428                                         paddr = addrbuf;
 429                                         while (!IsEmptyStr(paddr) &&
 430                                                (public_clientspos < public_clientsend)){
 431                                                 *(public_clientspos++) = *(paddr++);
 432                                         }
 433                                 }
 434                         }
 435                 fclose(fp);
 436                 pc_timestamp = time(NULL);
 437                 end_critical_section(S_PUBLIC_CLIENTS);
 438         }
 439
 440         lprintf(CTDL_DEBUG, "Checking whether %s is a local or public client\n",
 441                 CC->cs_addr);
 442         for (i=0; i<num_parms(public_clients); ++i) {
 443                 extract_token(addrbuf, public_clients, i, '|', sizeof addrbuf);
 444                 if (!strcasecmp(CC->cs_addr, addrbuf)) {
 445                         lprintf(CTDL_DEBUG, "... yes it is.\n");
 446                         return(1);
 447                 }
 448         }
 449
 450         /* No hits.  This is not a public client. */
 451         lprintf(CTDL_DEBUG, "... no it isn't.\n");
 452         return(0);
 453 }
 454
 455
 456 /*
 457  * the client is identifying itself to the server
 458  */
 459 void cmd_iden(char *argbuf)
 460 {
 461         int dev_code;
 462         int cli_code;
 463         int rev_level;
 464         char desc[128];
 465         char from_host[128];
 466         struct in_addr addr;
 467         int do_lookup = 0;
 468
 469         if (num_parms(argbuf)<4) {
 470                 cprintf("%d usage error\n", ERROR + ILLEGAL_VALUE);
 471                 return;
 472         }
 473
 474         dev_code = extract_int(argbuf,0);
 475         cli_code = extract_int(argbuf,1);
 476         rev_level = extract_int(argbuf,2);
 477         extract_token(desc, argbuf, 3, '|', sizeof desc);
 478
 479         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 480         from_host[sizeof from_host - 1] = 0;
 481         if (num_parms(argbuf)>=5) extract_token(from_host, argbuf, 4, '|', sizeof from_host);
 482
 483         CC->cs_clientdev = dev_code;
 484         CC->cs_clienttyp = cli_code;
 485         CC->cs_clientver = rev_level;
 486         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 487         CC->cs_clientname[31] = 0;
 488
 489         if (!IsEmptyStr(from_host)) {
 490                 if (CC->is_local_socket) do_lookup = 1;
 491                 else if (is_public_client()) do_lookup = 1;
 492         }
 493
 494         if (do_lookup) {
 495                 lprintf(CTDL_DEBUG, "Looking up hostname '%s'\n", from_host);
 496                 if ((addr.s_addr = inet_addr(from_host)) != -1) {
 497                         locate_host(CC->cs_host, sizeof CC->cs_host,
 498                                 CC->cs_addr, sizeof CC->cs_addr,
 499                                 &addr);
 500                 }
 501                 else {
 502                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 503                         CC->cs_host[sizeof CC->cs_host - 1] = 0;
 504                 }
 505         }
 506
 507         lprintf(CTDL_NOTICE, "Client %d/%d/%01d.%02d (%s) from %s\n",
 508                 dev_code,
 509                 cli_code,
 510                 (rev_level / 100),
 511                 (rev_level % 100),
 512                 desc,
 513                 CC->cs_host);
 514         cprintf("%d Ok\n",CIT_OK);
 515 }
 516
 517
 518 /*
 519  * display system messages or help
 520  */
 521 void cmd_mesg(char *mname)
 522 {
 523         FILE *mfp;
 524         char targ[256];
 525         char buf[256];
 526         char buf2[256];
 527         char *dirs[2];
 528         DIR *dp;
 529         struct dirent *d;
 530
 531         extract_token(buf, mname, 0, '|', sizeof buf);
 532
 533         dirs[0] = strdup(ctdl_message_dir);
 534         dirs[1] = strdup(ctdl_hlp_dir);
 535
 536         snprintf(buf2, sizeof buf2, "%s.%d.%d",
 537                 buf, CC->cs_clientdev, CC->cs_clienttyp);
 538
 539         /* If the client requested "?" then produce a listing */
 540         if (!strcmp(buf, "?")) {
 541                 cprintf("%d %s\n", LISTING_FOLLOWS, buf);
 542                 dp = opendir(dirs[1]);
 543                 if (dp != NULL) {
 544                         while (d = readdir(dp), d != NULL) {
 545                                 if (d->d_name[0] != '.') {
 546                                         cprintf(" %s\n", d->d_name);
 547                                 }
 548                         }
 549                         closedir(dp);
 550                 }
 551                 cprintf("000\n");
 552                 free(dirs[0]);
 553                 free(dirs[1]);
 554                 return;
 555         }
 556
 557         /* Otherwise, look for the requested file by name. */
 558         else {
 559                 mesg_locate(targ, sizeof targ, buf2, 2, (const char **)dirs);
 560                 if (IsEmptyStr(targ)) {
 561                         snprintf(buf2, sizeof buf2, "%s.%d",
 562                                                         buf, CC->cs_clientdev);
 563                         mesg_locate(targ, sizeof targ, buf2, 2,
 564                                                         (const char **)dirs);
 565                         if (IsEmptyStr(targ)) {
 566                                 mesg_locate(targ, sizeof targ, buf, 2,
 567                                                         (const char **)dirs);
 568                         }
 569                 }
 570         }
 571
 572         free(dirs[0]);
 573         free(dirs[1]);
 574
 575         if (IsEmptyStr(targ)) {
 576                 cprintf("%d '%s' not found.  (Searching in %s and %s)\n",
 577                         ERROR + FILE_NOT_FOUND,
 578                         mname,
 579                         ctdl_message_dir,
 580                         ctdl_hlp_dir
 581                 );
 582                 return;
 583         }
 584
 585         mfp = fopen(targ, "r");
 586         if (mfp==NULL) {
 587                 cprintf("%d Cannot open '%s': %s\n",
 588                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
 589                 return;
 590         }
 591         cprintf("%d %s\n", LISTING_FOLLOWS,buf);
 592
 593         while (fgets(buf, (sizeof buf - 1), mfp) != NULL) {
 594                 buf[strlen(buf)-1] = 0;
 595                 do_help_subst(buf);
 596                 cprintf("%s\n",buf);
 597         }
 598
 599         fclose(mfp);
 600         cprintf("000\n");
 601 }
 602
 603
 604 /*
 605  * enter system messages or help
 606  */
 607 void cmd_emsg(char *mname)
 608 {
 609         FILE *mfp;
 610         char targ[256];
 611         char buf[256];
 612         char *dirs[2];
 613         int a;
 614
 615         unbuffer_output();
 616
 617         if (CtdlAccessCheck(ac_aide)) return;
 618
 619         extract_token(buf, mname, 0, '|', sizeof buf);
 620         for (a=0; !IsEmptyStr(&buf[a]); ++a) {          /* security measure */
 621                 if (buf[a] == '/') buf[a] = '.';
 622         }
 623
 624         dirs[0] = strdup(ctdl_message_dir);
 625         dirs[1] = strdup(ctdl_hlp_dir);
 626
 627         mesg_locate(targ, sizeof targ, buf, 2, (const char**)dirs);
 628         free(dirs[0]);
 629         free(dirs[1]);
 630
 631         if (IsEmptyStr(targ)) {
 632                 snprintf(targ, sizeof targ,
 633                                  "%s/%s",
 634                                  ctdl_hlp_dir, buf);
 635         }
 636
 637         mfp = fopen(targ,"w");
 638         if (mfp==NULL) {
 639                 cprintf("%d Cannot open '%s': %s\n",
 640                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
 641                 return;
 642         }
 643         cprintf("%d %s\n", SEND_LISTING, targ);
 644
 645         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 646                 fprintf(mfp, "%s\n", buf);
 647         }
 648
 649         fclose(mfp);
 650 }
 651
 652
 653 /* Don't show the names of private rooms unless the viewing
 654  * user also knows the rooms.
 655  */
 656 void GenerateRoomDisplay(char *real_room,
 657                         struct CitContext *viewed,
 658                         struct CitContext *viewer) {
 659
 660         int ra;
 661
 662         strcpy(real_room, viewed->room.QRname);
 663         if (viewed->room.QRflags & QR_MAILBOX) {
 664                 strcpy(real_room, &real_room[11]);
 665         }
 666         if (viewed->room.QRflags & QR_PRIVATE) {
 667                 CtdlRoomAccess(&viewed->room, &viewer->user, &ra, NULL);
 668                 if ( (ra & UA_KNOWN) == 0) {
 669                         strcpy(real_room, "<private room>");
 670                 }
 671         }
 672
 673         if (viewed->cs_flags & CS_CHAT) {
 674                 while (strlen(real_room) < 14) {
 675                         strcat(real_room, " ");
 676                 }
 677                 strcpy(&real_room[14], "<chat>");
 678         }
 679
 680 }
 681
 682 /*
 683  * Convenience function.
 684  */
 685 int CtdlAccessCheck(int required_level) {
 686
 687         if (CC->internal_pgm) return(0);
 688         if (required_level >= ac_internal) {
 689                 cprintf("%d This is not a user-level command.\n",
 690                         ERROR + HIGHER_ACCESS_REQUIRED);
 691                 return(-1);
 692         }
 693
 694         if ((required_level >= ac_logged_in) && (CC->logged_in == 0)) {
 695                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 696                 return(-1);
 697         }
 698
 699         if (CC->user.axlevel >= 6) return(0);
 700         if (required_level >= ac_aide) {
 701                 cprintf("%d This command requires Aide access.\n",
 702                         ERROR + HIGHER_ACCESS_REQUIRED);
 703                 return(-1);
 704         }
 705
 706         if (is_room_aide()) return(0);
 707         if (required_level >= ac_room_aide) {
 708                 cprintf("%d This command requires Aide or Room Aide access.\n",
 709                         ERROR + HIGHER_ACCESS_REQUIRED);
 710                 return(-1);
 711         }
 712
 713         /* shhh ... succeed quietly */
 714         return(0);
 715 }
 716
 717
 718
 719 /*
 720  * Terminate another running session
 721  */
 722 void cmd_term(char *cmdbuf)
 723 {
 724         int session_num;
 725         struct CitContext *ccptr;
 726         int found_it = 0;
 727         int allowed = 0;
 728
 729         session_num = extract_int(cmdbuf, 0);
 730         if (session_num == CC->cs_pid) {
 731                 cprintf("%d You can't kill your own session.\n", ERROR + ILLEGAL_VALUE);
 732                 return;
 733         }
 734
 735         lprintf(CTDL_DEBUG, "Locating session to kill\n");
 736         begin_critical_section(S_SESSION_TABLE);
 737         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 738                 if (session_num == ccptr->cs_pid) {
 739                         found_it = 1;
 740                         if ((ccptr->user.usernum == CC->user.usernum)
 741                            || (CC->user.axlevel >= 6)) {
 742                                 allowed = 1;
 743                                 ccptr->kill_me = 1;
 744                         }
 745                         else {
 746                                 allowed = 0;
 747                         }
 748                 }
 749         }
 750         end_critical_section(S_SESSION_TABLE);
 751
 752         if (found_it) {
 753                 if (allowed) {
 754                         cprintf("%d Session terminated.\n", CIT_OK);
 755                 }
 756                 else {
 757                         cprintf("%d You are not allowed to do that.\n",
 758                                 ERROR + HIGHER_ACCESS_REQUIRED);
 759                 }
 760         }
 761         else {
 762                 cprintf("%d No such session.\n", ERROR + ILLEGAL_VALUE);
 763         }
 764 }
 765
 766
 767
 768
 769
 770 /*
 771  * get the paginator prompt
 772  */
 773 void cmd_more(void) {
 774         cprintf("%d %s\n", CIT_OK, config.c_moreprompt);
 775 }
 776
 777 /*
 778  * echo
 779  */
 780 void cmd_echo(char *etext)
 781 {
 782         cprintf("%d %s\n", CIT_OK, etext);
 783 }
 784
 785
 786
 787 /*
 788  * identify as internal program
 789  */
 790 void cmd_ipgm(char *argbuf)
 791 {
 792         int secret;
 793
 794         secret = extract_int(argbuf, 0);
 795
 796         /* For security reasons, we do NOT allow this command to run
 797          * over the network.  Local sockets only.
 798          */
 799         if (!CC->is_local_socket) {
 800                 sleep(5);
 801                 cprintf("%d Authentication failed.\n",
 802                         ERROR + PASSWORD_REQUIRED);
 803         }
 804         else if (secret == config.c_ipgm_secret) {
 805                 CC->internal_pgm = 1;
 806                 strcpy(CC->curr_user, "<internal program>");
 807                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 808                 cprintf("%d Authenticated as an internal program.\n", CIT_OK);
 809         }
 810         else {
 811                 sleep(5);
 812                 cprintf("%d Authentication failed.\n",
 813                         ERROR + PASSWORD_REQUIRED);
 814                 lprintf(CTDL_ERR, "Warning: ipgm authentication failed.\n");
 815                 CC->kill_me = 1;
 816         }
 817
 818         /* Now change the ipgm secret for the next round.
 819          * (Disabled because it breaks concurrent scripts.  The fact that
 820          * we no longer accept IPGM over the network should be sufficient
 821          * to prevent brute-force attacks.  If you don't agree, uncomment
 822          * this block.)
 823         get_config();
 824         config.c_ipgm_secret = rand();
 825         put_config();
 826         */
 827 }
 828
 829
 830 /*
 831  * Shut down the server
 832  */
 833 void cmd_down(char *argbuf) {
 834         char *Reply ="%d Shutting down server.  Goodbye.\n";
 835
 836         if (CtdlAccessCheck(ac_aide)) return;
 837
 838         if (!IsEmptyStr(argbuf))
 839         {
 840                 int state = CIT_OK;
 841                 restart_server = extract_int(argbuf, 0);
 842
 843                 if (restart_server > 0)
 844                         Reply = "%d Restarting server.  See you soon.\n";
 845                 if ((restart_server > 0) && !running_as_daemon)
 846                 {
 847                         lprintf(CTDL_ERR, "The user requested restart, but not running as deamon! Geronimooooooo!\n");
 848                         Reply = "%d Warning, not running in deamon mode. maybe we will come up again, but don't lean on it.\n";
 849                         state = ERROR;
 850                 }
 851                 cprintf(Reply, state);
 852         }
 853         else
 854         {
 855                 cprintf(Reply, CIT_OK + SERVER_SHUTTING_DOWN);
 856         }
 857         CtdlThreadStopAll();
 858 }
 859
 860 /*
 861  * Halt the server without exiting the server process.
 862  */
 863 void cmd_halt(void) {
 864
 865         if (CtdlAccessCheck(ac_aide)) return;
 866
 867         cprintf("%d Halting server.  Goodbye.\n", CIT_OK);
 868         CtdlThreadStopAll();
 869         shutdown_and_halt = 1;
 870 }
 871
 872 /*
 873  * Schedule or cancel a server shutdown
 874  */
 875 void cmd_scdn(char *argbuf)
 876 {
 877         int new_state;
 878         int state = CIT_OK;
 879         char *Reply = "%d %d\n";
 880
 881         if (CtdlAccessCheck(ac_aide)) return;
 882
 883         new_state = extract_int(argbuf, 0);
 884         if ((new_state == 2) || (new_state == 3))
 885         {
 886                 restart_server = 1;
 887                 if (!running_as_daemon)
 888                 {
 889                         lprintf(CTDL_ERR, "The user requested restart, but not running as deamon! Geronimooooooo!\n");
 890                         Reply = "%d %d Warning, not running in deamon mode. maybe we will come up again, but don't lean on it.\n";
 891                         state = ERROR;
 892                 }
 893
 894                 restart_server = extract_int(argbuf, 0);
 895                 new_state -= 2;
 896         }
 897         if ((new_state == 0) || (new_state == 1)) {
 898                 ScheduledShutdown = new_state;
 899         }
 900         cprintf(Reply, state, ScheduledShutdown);
 901 }
 902
 903
 904 /*
 905  * Set or unset asynchronous protocol mode
 906  */
 907 void cmd_asyn(char *argbuf)
 908 {
 909         int new_state;
 910
 911         new_state = extract_int(argbuf, 0);
 912         if ((new_state == 0) || (new_state == 1)) {
 913                 CC->is_async = new_state;
 914         }
 915         cprintf("%d %d\n", CIT_OK, CC->is_async);
 916 }
 917
 918
 919 /*
 920  * Generate a "nonce" for APOP-style authentication.
 921  *
 922  * RFC 1725 et al specify a PID to be placed in front of the nonce.
 923  * Quoth BTX: That would be stupid.
 924  */
 925 void generate_nonce(struct CitContext *con) {
 926         struct timeval tv;
 927
 928         memset(con->cs_nonce, NONCE_SIZE, 0);
 929         gettimeofday(&tv, NULL);
 930         memset(con->cs_nonce, NONCE_SIZE, 0);
 931         snprintf(con->cs_nonce, NONCE_SIZE, "<%d%ld@%s>",
 932                 rand(), (long)tv.tv_usec, config.c_fqdn);
 933 }
 934
 935
 936
 937
 938 /*
 939  * Back-end function for starting a session
 940  */
 941 void begin_session(struct CitContext *con)
 942 {
 943         socklen_t len;
 944         struct sockaddr_in sin;
 945
 946         /*
 947          * Initialize some variables specific to our context.
 948          */
 949         con->logged_in = 0;
 950         con->internal_pgm = 0;
 951         con->download_fp = NULL;
 952         con->upload_fp = NULL;
 953         con->FirstExpressMessage = NULL;
 954         time(&con->lastcmd);
 955         time(&con->lastidle);
 956         strcpy(con->lastcmdname, "    ");
 957         strcpy(con->cs_clientname, "(unknown)");
 958         strcpy(con->curr_user, NLI);
 959         *con->net_node = '\0';
 960         *con->fake_username = '\0';
 961         *con->fake_hostname = '\0';
 962         *con->fake_roomname = '\0';
 963         generate_nonce(con);
 964         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 965         safestrncpy(con->cs_addr, "", sizeof con->cs_addr);
 966         con->cs_host[sizeof con->cs_host - 1] = 0;
 967         len = sizeof sin;
 968         if (!CC->is_local_socket) {
 969                 if (!getpeername(con->client_socket, (struct sockaddr *) &sin, &len)) {
 970                         locate_host(con->cs_host, sizeof con->cs_host,
 971                                 con->cs_addr, sizeof con->cs_addr,
 972                                 &sin.sin_addr
 973                         );
 974                 }
 975         }
 976         else {
 977                 strcpy(con->cs_host, "");
 978         }
 979         con->cs_flags = 0;
 980         con->upload_type = UPL_FILE;
 981         con->dl_is_net = 0;
 982
 983         con->nologin = 0;
 984         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions)) {
 985                 con->nologin = 1;
 986         }
 987
 988         if (!CC->is_local_socket) {
 989                 lprintf(CTDL_NOTICE, "Session started from %s [%s].\n", con->cs_host, con->cs_addr);
 990         }
 991         else {
 992                 lprintf(CTDL_NOTICE, "Session started via local socket.\n");
 993         }
 994
 995         /* Run any session startup routines registered by loadable modules */
 996         PerformSessionHooks(EVT_START);
 997 }
 998
 999
1000 void citproto_begin_session() {
1001         if (CC->nologin==1) {
1002                 cprintf("%d %s: Too many users are already online (maximum is %d)\n",
1003                         ERROR + MAX_SESSIONS_EXCEEDED,
1004                         config.c_nodename, config.c_maxsessions
1005                 );
1006                 CC->kill_me = 1;
1007         }
1008         else {
1009                 cprintf("%d %s Citadel server ready.\n",
1010                         CIT_OK, config.c_nodename);
1011         }
1012 }
1013
1014
1015
1016
1017 /*
1018  * This loop recognizes all server commands.
1019  */
1020 void do_command_loop(void) {
1021         char cmdbuf[SIZ];
1022         const char *old_name = NULL;
1023
1024         old_name = CtdlThreadName("do_command_loop");
1025
1026         time(&CC->lastcmd);
1027         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
1028         if (client_getln(cmdbuf, sizeof cmdbuf) < 1) {
1029                 lprintf(CTDL_ERR, "Client disconnected: ending session.\n");
1030                 CC->kill_me = 1;
1031                 CtdlThreadName(old_name);
1032                 return;
1033         }
1034
1035         /* Log the server command, but don't show passwords... */
1036         if ( (strncasecmp(cmdbuf, "PASS", 4))
1037            && (strncasecmp(cmdbuf, "SETP", 4)) ) {
1038                 lprintf(CTDL_INFO, "%s\n", cmdbuf);
1039         }
1040         else {
1041                 lprintf(CTDL_INFO, "<password command sent>\n");
1042         }
1043
1044         buffer_output();
1045
1046         /*
1047          * Let other clients see the last command we executed, and
1048          * update the idle time, but not NOOP, QNOP, PEXP, GEXP, RWHO, or TIME.
1049          */
1050         if ( (strncasecmp(cmdbuf, "NOOP", 4))
1051            && (strncasecmp(cmdbuf, "QNOP", 4))
1052            && (strncasecmp(cmdbuf, "PEXP", 4))
1053            && (strncasecmp(cmdbuf, "GEXP", 4))
1054            && (strncasecmp(cmdbuf, "RWHO", 4))
1055            && (strncasecmp(cmdbuf, "TIME", 4)) ) {
1056                 strcpy(CC->lastcmdname, "    ");
1057                 safestrncpy(CC->lastcmdname, cmdbuf, sizeof(CC->lastcmdname));
1058                 time(&CC->lastidle);
1059         }
1060
1061         CtdlThreadName(cmdbuf);
1062
1063         if ((strncasecmp(cmdbuf, "ENT0", 4))
1064            && (strncasecmp(cmdbuf, "MESG", 4))
1065            && (strncasecmp(cmdbuf, "MSGS", 4)))
1066         {
1067            CC->cs_flags &= ~CS_POSTING;
1068         }
1069
1070         if (!strncasecmp(cmdbuf, "NOOP", 4)) {
1071                 cprintf("%d%cok\n", CIT_OK, CtdlCheckExpress() );
1072         }
1073
1074         else if (!strncasecmp(cmdbuf, "XYZZY", 5)) {
1075                 cprintf("%d Nothing happens.\n", CIT_OK);
1076         }
1077
1078         else if (!strncasecmp(cmdbuf, "QNOP", 4)) {
1079                 /* do nothing, this command returns no response */
1080         }
1081
1082         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
1083                 cprintf("%d Goodbye.\n", CIT_OK);
1084                 CC->kill_me = 1;
1085         }
1086
1087         else if (!strncasecmp(cmdbuf,"ASYN",4)) {
1088                 cmd_asyn(&cmdbuf[5]);
1089         }
1090
1091         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
1092                 if (CC->logged_in) logout(CC);
1093                 cprintf("%d logged out.\n", CIT_OK);
1094         }
1095
1096         else if (!strncasecmp(cmdbuf,"USER",4)) {
1097                 cmd_user(&cmdbuf[5]);
1098         }
1099
1100         else if (!strncasecmp(cmdbuf,"PASS",4)) {
1101                 cmd_pass(&cmdbuf[5]);
1102         }
1103
1104         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
1105                 cmd_newu(&cmdbuf[5]);
1106         }
1107
1108         else if (!strncasecmp(cmdbuf,"CREU",4)) {
1109                 cmd_creu(&cmdbuf[5]);
1110         }
1111
1112         else if (!strncasecmp(cmdbuf,"SETP",4)) {
1113                 cmd_setp(&cmdbuf[5]);
1114         }
1115
1116         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
1117                 cmd_lrms(&cmdbuf[5]);
1118         }
1119
1120         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
1121                 cmd_lkra(&cmdbuf[5]);
1122         }
1123
1124         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
1125                 cmd_lkrn(&cmdbuf[5]);
1126         }
1127
1128         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
1129                 cmd_lkro(&cmdbuf[5]);
1130         }
1131
1132         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
1133                 cmd_lzrm(&cmdbuf[5]);
1134         }
1135
1136         else if (!strncasecmp(cmdbuf,"LPRM",4)) {
1137                 cmd_lprm(&cmdbuf[5]);
1138         }
1139
1140         else if (!strncasecmp(cmdbuf,"GETU",4)) {
1141                 cmd_getu();
1142         }
1143
1144         else if (!strncasecmp(cmdbuf,"SETU",4)) {
1145                 cmd_setu(&cmdbuf[5]);
1146         }
1147
1148         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
1149                 cmd_goto(&cmdbuf[5]);
1150         }
1151
1152         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
1153                 cmd_msgs(&cmdbuf[5]);
1154         }
1155
1156         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
1157                 cmd_whok();
1158         }
1159
1160         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
1161                 cmd_rdir();
1162         }
1163
1164         else if (!strncasecmp(cmdbuf,"EUID",4)) {
1165                 cmd_euid(&cmdbuf[5]);
1166         }
1167
1168         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
1169                 cmd_msg0(&cmdbuf[5]);
1170         }
1171
1172         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
1173                 cmd_msg2(&cmdbuf[5]);
1174         }
1175
1176         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
1177                 cmd_msg3(&cmdbuf[5]);
1178         }
1179
1180         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
1181                 cmd_msg4(&cmdbuf[5]);
1182         }
1183
1184         else if (!strncasecmp(cmdbuf,"MSGP",4)) {
1185                 cmd_msgp(&cmdbuf[5]);
1186         }
1187
1188         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
1189                 cmd_opna(&cmdbuf[5]);
1190         }
1191
1192         else if (!strncasecmp(cmdbuf,"DLAT",4)) {
1193                 cmd_dlat(&cmdbuf[5]);
1194         }
1195
1196         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1197                 cmd_info();
1198         }
1199
1200         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1201                 cmd_slrp(&cmdbuf[5]);
1202         }
1203
1204         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1205                 cmd_invt_kick(&cmdbuf[5],1);
1206         }
1207
1208         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1209                 cmd_invt_kick(&cmdbuf[5],0);
1210         }
1211
1212         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1213                 cmd_getr();
1214         }
1215
1216         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1217                 cmd_setr(&cmdbuf[5]);
1218         }
1219
1220         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1221                 cmd_geta();
1222         }
1223
1224         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1225                 cmd_seta(&cmdbuf[5]);
1226         }
1227
1228         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1229                 cmd_ent0(&cmdbuf[5]);
1230         }
1231
1232         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1233                 cmd_rinf();
1234         }
1235
1236         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1237                 cmd_dele(&cmdbuf[5]);
1238         }
1239
1240         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1241                 cmd_kill(&cmdbuf[5]);
1242         }
1243
1244         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1245                 cmd_cre8(&cmdbuf[5]);
1246         }
1247
1248         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1249                 cmd_move(&cmdbuf[5]);
1250         }
1251
1252         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1253                 cmd_forg();
1254         }
1255
1256         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1257                 cmd_mesg(&cmdbuf[5]);
1258         }
1259
1260         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1261                 cmd_emsg(&cmdbuf[5]);
1262         }
1263
1264         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1265                 cmd_gnur();
1266         }
1267
1268         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1269                 cmd_vali(&cmdbuf[5]);
1270         }
1271
1272         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1273                 cmd_einf(&cmdbuf[5]);
1274         }
1275
1276         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1277                 cmd_list(&cmdbuf[5]);
1278         }
1279
1280         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1281                 cmd_chek();
1282         }
1283
1284         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1285                 cmd_delf(&cmdbuf[5]);
1286         }
1287
1288         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1289                 cmd_movf(&cmdbuf[5]);
1290         }
1291
1292         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1293                 cmd_netf(&cmdbuf[5]);
1294         }
1295
1296         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1297                 cmd_open(&cmdbuf[5]);
1298         }
1299
1300         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1301                 cmd_clos();
1302         }
1303
1304         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1305                 cmd_uopn(&cmdbuf[5]);
1306         }
1307
1308         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1309                 cmd_ucls(&cmdbuf[5]);
1310         }
1311
1312         else if (!strncasecmp(cmdbuf,"READ",4)) {
1313                 cmd_read(&cmdbuf[5]);
1314         }
1315
1316         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1317                 cmd_writ(&cmdbuf[5]);
1318         }
1319
1320         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1321                 cmd_qusr(&cmdbuf[5]);
1322         }
1323
1324         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1325                 cmd_echo(&cmdbuf[5]);
1326         }
1327
1328         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1329                 cmd_oimg(&cmdbuf[5]);
1330         }
1331
1332         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1333                 cmd_more();
1334         }
1335
1336         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1337                 cmd_ndop(&cmdbuf[5]);
1338         }
1339
1340         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1341                 cmd_nuop(&cmdbuf[5]);
1342         }
1343
1344         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1345                 cmd_lflr();
1346         }
1347
1348         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1349                 cmd_cflr(&cmdbuf[5]);
1350         }
1351
1352         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1353                 cmd_kflr(&cmdbuf[5]);
1354         }
1355
1356         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1357                 cmd_eflr(&cmdbuf[5]);
1358         }
1359
1360         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1361                 cmd_iden(&cmdbuf[5]);
1362         }
1363
1364         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1365                 cmd_ipgm(&cmdbuf[5]);
1366         }
1367
1368         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1369                 cmd_term(&cmdbuf[5]);
1370         }
1371
1372         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1373                 cmd_down(&cmdbuf[5]);
1374         }
1375
1376         else if (!strncasecmp(cmdbuf,"HALT",4)) {
1377                 cmd_halt();
1378         }
1379
1380         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1381                 cmd_scdn(&cmdbuf[5]);
1382         }
1383
1384         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1385                 cmd_uimg(&cmdbuf[5]);
1386         }
1387
1388         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1389                 cmd_time();
1390         }
1391
1392         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1393                 cmd_agup(&cmdbuf[5]);
1394         }
1395
1396         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1397                 cmd_asup(&cmdbuf[5]);
1398         }
1399
1400         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1401                 cmd_gpex(&cmdbuf[5]);
1402         }
1403
1404         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1405                 cmd_spex(&cmdbuf[5]);
1406         }
1407
1408         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1409                 cmd_conf(&cmdbuf[5]);
1410         }
1411
1412         else if (!strncasecmp(cmdbuf, "SEEN", 4)) {
1413                 cmd_seen(&cmdbuf[5]);
1414         }
1415
1416         else if (!strncasecmp(cmdbuf, "GTSN", 4)) {
1417                 cmd_gtsn(&cmdbuf[5]);
1418         }
1419
1420         else if (!strncasecmp(cmdbuf, "VIEW", 4)) {
1421                 cmd_view(&cmdbuf[5]);
1422         }
1423
1424         else if (!strncasecmp(cmdbuf, "ISME", 4)) {
1425                 cmd_isme(&cmdbuf[5]);
1426         }
1427
1428         else if (!DLoader_Exec_Cmd(cmdbuf)) {
1429                 cprintf("%d Unrecognized or unsupported command.\n", ERROR + CMD_NOT_SUPPORTED);
1430         }
1431
1432         unbuffer_output();
1433
1434         /* Run any after-each-command routines registered by modules */
1435         PerformSessionHooks(EVT_CMD);
1436         CtdlThreadName(old_name);
1437 }
1438
1439
1440 /*
1441  * This loop performs all asynchronous functions.
1442  */
1443 void do_async_loop(void) {
1444         PerformSessionHooks(EVT_ASYNC);
1445 }