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("%d\n", config.c_enable_fulltext);
 319
 320         cprintf("000\n");
 321 }
 322
 323
 324 /*
 325  * returns an asterisk if there are any instant messages waiting,
 326  * space otherwise.
 327  */
 328 char CtdlCheckExpress(void) {
 329         if (CC->FirstExpressMessage == NULL) {
 330                 return(' ');
 331         }
 332         else {
 333                 return('*');
 334         }
 335 }
 336
 337 void cmd_time(void)
 338 {
 339    time_t tv;
 340    struct tm tmp;
 341
 342    tv = time(NULL);
 343    localtime_r(&tv, &tmp);
 344
 345    /* timezone and daylight global variables are not portable. */
 346 #ifdef HAVE_STRUCT_TM_TM_GMTOFF
 347    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, tmp.tm_gmtoff, tmp.tm_isdst);
 348 #else
 349    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, timezone, tmp.tm_isdst);
 350 #endif
 351 }
 352
 353
 354 /*
 355  * Check originating host against the public_clients file.  This determines
 356  * whether the client is allowed to change the hostname for this session
 357  * (for example, to show the location of the user rather than the location
 358  * of the client).
 359  */
 360 int is_public_client(void)
 361 {
 362         char buf[1024];
 363         char addrbuf[1024];
 364         FILE *fp;
 365         int i;
 366         char *public_clientspos;
 367         char *public_clientsend;
 368         char *paddr = NULL;
 369         struct stat statbuf;
 370         static time_t pc_timestamp = 0;
 371         static char public_clients[SIZ];
 372         static char public_clients_file[SIZ];
 373
 374 #define LOCALHOSTSTR "127.0.0.1"
 375
 376         snprintf(public_clients_file,
 377                          sizeof public_clients_file,
 378                          "%s/public_clients",
 379                          ctdl_etc_dir);
 380
 381         /*
 382          * Check the time stamp on the public_clients file.  If it's been
 383          * updated since the last time we were here (or if this is the first
 384          * time we've been through the loop), read its contents and learn
 385          * the IP addresses of the listed hosts.
 386          */
 387         if (stat(public_clients_file, &statbuf) != 0) {
 388                 /* No public_clients file exists, so bail out */
 389                 lprintf(CTDL_WARNING, "Warning: '%s' does not exist\n",
 390                                 public_clients_file);
 391                 return(0);
 392         }
 393
 394         if (statbuf.st_mtime > pc_timestamp) {
 395                 begin_critical_section(S_PUBLIC_CLIENTS);
 396                 lprintf(CTDL_INFO, "Loading %s\n", public_clients_file);
 397
 398                 public_clientspos = &public_clients[0];
 399                 public_clientsend = public_clientspos + SIZ;
 400                 safestrncpy(public_clientspos, LOCALHOSTSTR, sizeof public_clients);
 401                 public_clientspos += sizeof(LOCALHOSTSTR) - 1;
 402
 403                 if (hostname_to_dotted_quad(addrbuf, config.c_fqdn) == 0) {
 404                         *(public_clientspos++) = '|';
 405                         paddr = &addrbuf[0];
 406                         while (!IsEmptyStr (paddr) &&
 407                                (public_clientspos < public_clientsend))
 408                                 *(public_clientspos++) = *(paddr++);
 409                 }
 410
 411                 fp = fopen(public_clients_file, "r");
 412                 if (fp != NULL)
 413                         while ((fgets(buf, sizeof buf, fp)!=NULL) &&
 414                                (public_clientspos < public_clientsend)){
 415                                 char *ptr;
 416                                 ptr = buf;
 417                                 while (!IsEmptyStr(ptr)) {
 418                                         if (*ptr == '#') {
 419                                                 *ptr = 0;
 420                                                 break;
 421                                         }
 422                                 else ptr++;
 423                                 }
 424                                 ptr--;
 425                                 while (ptr>buf && isspace(*ptr)) {
 426                                         *(ptr--) = 0;
 427                                 }
 428                                 if (hostname_to_dotted_quad(addrbuf, buf) == 0) {
 429                                         *(public_clientspos++) = '|';
 430                                         paddr = addrbuf;
 431                                         while (!IsEmptyStr(paddr) &&
 432                                                (public_clientspos < public_clientsend)){
 433                                                 *(public_clientspos++) = *(paddr++);
 434                                         }
 435                                 }
 436                         }
 437                 fclose(fp);
 438                 pc_timestamp = time(NULL);
 439                 end_critical_section(S_PUBLIC_CLIENTS);
 440         }
 441
 442         lprintf(CTDL_DEBUG, "Checking whether %s is a local or public client\n",
 443                 CC->cs_addr);
 444         for (i=0; i<num_parms(public_clients); ++i) {
 445                 extract_token(addrbuf, public_clients, i, '|', sizeof addrbuf);
 446                 if (!strcasecmp(CC->cs_addr, addrbuf)) {
 447                         lprintf(CTDL_DEBUG, "... yes it is.\n");
 448                         return(1);
 449                 }
 450         }
 451
 452         /* No hits.  This is not a public client. */
 453         lprintf(CTDL_DEBUG, "... no it isn't.\n");
 454         return(0);
 455 }
 456
 457
 458 /*
 459  * the client is identifying itself to the server
 460  */
 461 void cmd_iden(char *argbuf)
 462 {
 463         int dev_code;
 464         int cli_code;
 465         int rev_level;
 466         char desc[128];
 467         char from_host[128];
 468         struct in_addr addr;
 469         int do_lookup = 0;
 470
 471         if (num_parms(argbuf)<4) {
 472                 cprintf("%d usage error\n", ERROR + ILLEGAL_VALUE);
 473                 return;
 474         }
 475
 476         dev_code = extract_int(argbuf,0);
 477         cli_code = extract_int(argbuf,1);
 478         rev_level = extract_int(argbuf,2);
 479         extract_token(desc, argbuf, 3, '|', sizeof desc);
 480
 481         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 482         from_host[sizeof from_host - 1] = 0;
 483         if (num_parms(argbuf)>=5) extract_token(from_host, argbuf, 4, '|', sizeof from_host);
 484
 485         CC->cs_clientdev = dev_code;
 486         CC->cs_clienttyp = cli_code;
 487         CC->cs_clientver = rev_level;
 488         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 489         CC->cs_clientname[31] = 0;
 490
 491         if (!IsEmptyStr(from_host)) {
 492                 if (CC->is_local_socket) do_lookup = 1;
 493                 else if (is_public_client()) do_lookup = 1;
 494         }
 495
 496         if (do_lookup) {
 497                 lprintf(CTDL_DEBUG, "Looking up hostname '%s'\n", from_host);
 498                 if ((addr.s_addr = inet_addr(from_host)) != -1) {
 499                         locate_host(CC->cs_host, sizeof CC->cs_host,
 500                                 CC->cs_addr, sizeof CC->cs_addr,
 501                                 &addr);
 502                 }
 503                 else {
 504                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 505                         CC->cs_host[sizeof CC->cs_host - 1] = 0;
 506                 }
 507         }
 508
 509         lprintf(CTDL_NOTICE, "Client %d/%d/%01d.%02d (%s) from %s\n",
 510                 dev_code,
 511                 cli_code,
 512                 (rev_level / 100),
 513                 (rev_level % 100),
 514                 desc,
 515                 CC->cs_host);
 516         cprintf("%d Ok\n",CIT_OK);
 517 }
 518
 519
 520 /*
 521  * display system messages or help
 522  */
 523 void cmd_mesg(char *mname)
 524 {
 525         FILE *mfp;
 526         char targ[256];
 527         char buf[256];
 528         char buf2[256];
 529         char *dirs[2];
 530         DIR *dp;
 531         struct dirent *d;
 532
 533         extract_token(buf, mname, 0, '|', sizeof buf);
 534
 535         dirs[0] = strdup(ctdl_message_dir);
 536         dirs[1] = strdup(ctdl_hlp_dir);
 537
 538         snprintf(buf2, sizeof buf2, "%s.%d.%d",
 539                 buf, CC->cs_clientdev, CC->cs_clienttyp);
 540
 541         /* If the client requested "?" then produce a listing */
 542         if (!strcmp(buf, "?")) {
 543                 cprintf("%d %s\n", LISTING_FOLLOWS, buf);
 544                 dp = opendir(dirs[1]);
 545                 if (dp != NULL) {
 546                         while (d = readdir(dp), d != NULL) {
 547                                 if (d->d_name[0] != '.') {
 548                                         cprintf(" %s\n", d->d_name);
 549                                 }
 550                         }
 551                         closedir(dp);
 552                 }
 553                 cprintf("000\n");
 554                 free(dirs[0]);
 555                 free(dirs[1]);
 556                 return;
 557         }
 558
 559         /* Otherwise, look for the requested file by name. */
 560         else {
 561                 mesg_locate(targ, sizeof targ, buf2, 2, (const char **)dirs);
 562                 if (IsEmptyStr(targ)) {
 563                         snprintf(buf2, sizeof buf2, "%s.%d",
 564                                                         buf, CC->cs_clientdev);
 565                         mesg_locate(targ, sizeof targ, buf2, 2,
 566                                                         (const char **)dirs);
 567                         if (IsEmptyStr(targ)) {
 568                                 mesg_locate(targ, sizeof targ, buf, 2,
 569                                                         (const char **)dirs);
 570                         }
 571                 }
 572         }
 573
 574         free(dirs[0]);
 575         free(dirs[1]);
 576
 577         if (IsEmptyStr(targ)) {
 578                 cprintf("%d '%s' not found.  (Searching in %s and %s)\n",
 579                         ERROR + FILE_NOT_FOUND,
 580                         mname,
 581                         ctdl_message_dir,
 582                         ctdl_hlp_dir
 583                 );
 584                 return;
 585         }
 586
 587         mfp = fopen(targ, "r");
 588         if (mfp==NULL) {
 589                 cprintf("%d Cannot open '%s': %s\n",
 590                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
 591                 return;
 592         }
 593         cprintf("%d %s\n", LISTING_FOLLOWS,buf);
 594
 595         while (fgets(buf, (sizeof buf - 1), mfp) != NULL) {
 596                 buf[strlen(buf)-1] = 0;
 597                 do_help_subst(buf);
 598                 cprintf("%s\n",buf);
 599         }
 600
 601         fclose(mfp);
 602         cprintf("000\n");
 603 }
 604
 605
 606 /*
 607  * enter system messages or help
 608  */
 609 void cmd_emsg(char *mname)
 610 {
 611         FILE *mfp;
 612         char targ[256];
 613         char buf[256];
 614         char *dirs[2];
 615         int a;
 616
 617         unbuffer_output();
 618
 619         if (CtdlAccessCheck(ac_aide)) return;
 620
 621         extract_token(buf, mname, 0, '|', sizeof buf);
 622         for (a=0; !IsEmptyStr(&buf[a]); ++a) {          /* security measure */
 623                 if (buf[a] == '/') buf[a] = '.';
 624         }
 625
 626         dirs[0] = strdup(ctdl_message_dir);
 627         dirs[1] = strdup(ctdl_hlp_dir);
 628
 629         mesg_locate(targ, sizeof targ, buf, 2, (const char**)dirs);
 630         free(dirs[0]);
 631         free(dirs[1]);
 632
 633         if (IsEmptyStr(targ)) {
 634                 snprintf(targ, sizeof targ,
 635                                  "%s/%s",
 636                                  ctdl_hlp_dir, buf);
 637         }
 638
 639         mfp = fopen(targ,"w");
 640         if (mfp==NULL) {
 641                 cprintf("%d Cannot open '%s': %s\n",
 642                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
 643                 return;
 644         }
 645         cprintf("%d %s\n", SEND_LISTING, targ);
 646
 647         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 648                 fprintf(mfp, "%s\n", buf);
 649         }
 650
 651         fclose(mfp);
 652 }
 653
 654
 655 /* Don't show the names of private rooms unless the viewing
 656  * user also knows the rooms.
 657  */
 658 void GenerateRoomDisplay(char *real_room,
 659                         struct CitContext *viewed,
 660                         struct CitContext *viewer) {
 661
 662         int ra;
 663
 664         strcpy(real_room, viewed->room.QRname);
 665         if (viewed->room.QRflags & QR_MAILBOX) {
 666                 strcpy(real_room, &real_room[11]);
 667         }
 668         if (viewed->room.QRflags & QR_PRIVATE) {
 669                 CtdlRoomAccess(&viewed->room, &viewer->user, &ra, NULL);
 670                 if ( (ra & UA_KNOWN) == 0) {
 671                         strcpy(real_room, "<private room>");
 672                 }
 673         }
 674
 675         if (viewed->cs_flags & CS_CHAT) {
 676                 while (strlen(real_room) < 14) {
 677                         strcat(real_room, " ");
 678                 }
 679                 strcpy(&real_room[14], "<chat>");
 680         }
 681
 682 }
 683
 684 /*
 685  * Convenience function.
 686  */
 687 int CtdlAccessCheck(int required_level) {
 688
 689         if (CC->internal_pgm) return(0);
 690         if (required_level >= ac_internal) {
 691                 cprintf("%d This is not a user-level command.\n",
 692                         ERROR + HIGHER_ACCESS_REQUIRED);
 693                 return(-1);
 694         }
 695
 696         if ((required_level >= ac_logged_in) && (CC->logged_in == 0)) {
 697                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 698                 return(-1);
 699         }
 700
 701         if (CC->user.axlevel >= 6) return(0);
 702         if (required_level >= ac_aide) {
 703                 cprintf("%d This command requires Aide access.\n",
 704                         ERROR + HIGHER_ACCESS_REQUIRED);
 705                 return(-1);
 706         }
 707
 708         if (is_room_aide()) return(0);
 709         if (required_level >= ac_room_aide) {
 710                 cprintf("%d This command requires Aide or Room Aide access.\n",
 711                         ERROR + HIGHER_ACCESS_REQUIRED);
 712                 return(-1);
 713         }
 714
 715         /* shhh ... succeed quietly */
 716         return(0);
 717 }
 718
 719
 720
 721 /*
 722  * Terminate another running session
 723  */
 724 void cmd_term(char *cmdbuf)
 725 {
 726         int session_num;
 727         struct CitContext *ccptr;
 728         int found_it = 0;
 729         int allowed = 0;
 730
 731         session_num = extract_int(cmdbuf, 0);
 732         if (session_num == CC->cs_pid) {
 733                 cprintf("%d You can't kill your own session.\n", ERROR + ILLEGAL_VALUE);
 734                 return;
 735         }
 736
 737         lprintf(CTDL_DEBUG, "Locating session to kill\n");
 738         begin_critical_section(S_SESSION_TABLE);
 739         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 740                 if (session_num == ccptr->cs_pid) {
 741                         found_it = 1;
 742                         if ((ccptr->user.usernum == CC->user.usernum)
 743                            || (CC->user.axlevel >= 6)) {
 744                                 allowed = 1;
 745                                 ccptr->kill_me = 1;
 746                         }
 747                         else {
 748                                 allowed = 0;
 749                         }
 750                 }
 751         }
 752         end_critical_section(S_SESSION_TABLE);
 753
 754         if (found_it) {
 755                 if (allowed) {
 756                         cprintf("%d Session terminated.\n", CIT_OK);
 757                 }
 758                 else {
 759                         cprintf("%d You are not allowed to do that.\n",
 760                                 ERROR + HIGHER_ACCESS_REQUIRED);
 761                 }
 762         }
 763         else {
 764                 cprintf("%d No such session.\n", ERROR + ILLEGAL_VALUE);
 765         }
 766 }
 767
 768
 769
 770
 771
 772 /*
 773  * get the paginator prompt
 774  */
 775 void cmd_more(void) {
 776         cprintf("%d %s\n", CIT_OK, config.c_moreprompt);
 777 }
 778
 779 /*
 780  * echo
 781  */
 782 void cmd_echo(char *etext)
 783 {
 784         cprintf("%d %s\n", CIT_OK, etext);
 785 }
 786
 787
 788
 789 /*
 790  * identify as internal program
 791  */
 792 void cmd_ipgm(char *argbuf)
 793 {
 794         int secret;
 795
 796         secret = extract_int(argbuf, 0);
 797
 798         /* For security reasons, we do NOT allow this command to run
 799          * over the network.  Local sockets only.
 800          */
 801         if (!CC->is_local_socket) {
 802                 sleep(5);
 803                 cprintf("%d Authentication failed.\n",
 804                         ERROR + PASSWORD_REQUIRED);
 805         }
 806         else if (secret == config.c_ipgm_secret) {
 807                 CC->internal_pgm = 1;
 808                 strcpy(CC->curr_user, "<internal program>");
 809                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 810                 cprintf("%d Authenticated as an internal program.\n", CIT_OK);
 811         }
 812         else {
 813                 sleep(5);
 814                 cprintf("%d Authentication failed.\n",
 815                         ERROR + PASSWORD_REQUIRED);
 816                 lprintf(CTDL_ERR, "Warning: ipgm authentication failed.\n");
 817                 CC->kill_me = 1;
 818         }
 819
 820         /* Now change the ipgm secret for the next round.
 821          * (Disabled because it breaks concurrent scripts.  The fact that
 822          * we no longer accept IPGM over the network should be sufficient
 823          * to prevent brute-force attacks.  If you don't agree, uncomment
 824          * this block.)
 825         get_config();
 826         config.c_ipgm_secret = rand();
 827         put_config();
 828         */
 829 }
 830
 831
 832 /*
 833  * Shut down the server
 834  */
 835 void cmd_down(char *argbuf) {
 836         char *Reply ="%d Shutting down server.  Goodbye.\n";
 837
 838         if (CtdlAccessCheck(ac_aide)) return;
 839
 840         if (!IsEmptyStr(argbuf))
 841         {
 842                 int state = CIT_OK;
 843                 restart_server = extract_int(argbuf, 0);
 844
 845                 if (restart_server > 0)
 846                         Reply = "%d Restarting server.  See you soon.\n";
 847                 if ((restart_server > 0) && !running_as_daemon)
 848                 {
 849                         lprintf(CTDL_ERR, "The user requested restart, but not running as deamon! Geronimooooooo!\n");
 850                         Reply = "%d Warning, not running in deamon mode. maybe we will come up again, but don't lean on it.\n";
 851                         state = ERROR;
 852                 }
 853                 cprintf(Reply, state);
 854         }
 855         else
 856         {
 857                 cprintf(Reply, CIT_OK + SERVER_SHUTTING_DOWN);
 858         }
 859         CtdlThreadStopAll();
 860 }
 861
 862 /*
 863  * Halt the server without exiting the server process.
 864  */
 865 void cmd_halt(void) {
 866
 867         if (CtdlAccessCheck(ac_aide)) return;
 868
 869         cprintf("%d Halting server.  Goodbye.\n", CIT_OK);
 870         CtdlThreadStopAll();
 871         shutdown_and_halt = 1;
 872 }
 873
 874 /*
 875  * Schedule or cancel a server shutdown
 876  */
 877 void cmd_scdn(char *argbuf)
 878 {
 879         int new_state;
 880         int state = CIT_OK;
 881         char *Reply = "%d %d\n";
 882
 883         if (CtdlAccessCheck(ac_aide)) return;
 884
 885         new_state = extract_int(argbuf, 0);
 886         if ((new_state == 2) || (new_state == 3))
 887         {
 888                 restart_server = 1;
 889                 if (!running_as_daemon)
 890                 {
 891                         lprintf(CTDL_ERR, "The user requested restart, but not running as deamon! Geronimooooooo!\n");
 892                         Reply = "%d %d Warning, not running in deamon mode. maybe we will come up again, but don't lean on it.\n";
 893                         state = ERROR;
 894                 }
 895
 896                 restart_server = extract_int(argbuf, 0);
 897                 new_state -= 2;
 898         }
 899         if ((new_state == 0) || (new_state == 1)) {
 900                 ScheduledShutdown = new_state;
 901         }
 902         cprintf(Reply, state, ScheduledShutdown);
 903 }
 904
 905
 906 /*
 907  * Set or unset asynchronous protocol mode
 908  */
 909 void cmd_asyn(char *argbuf)
 910 {
 911         int new_state;
 912
 913         new_state = extract_int(argbuf, 0);
 914         if ((new_state == 0) || (new_state == 1)) {
 915                 CC->is_async = new_state;
 916         }
 917         cprintf("%d %d\n", CIT_OK, CC->is_async);
 918 }
 919
 920
 921 /*
 922  * Generate a "nonce" for APOP-style authentication.
 923  *
 924  * RFC 1725 et al specify a PID to be placed in front of the nonce.
 925  * Quoth BTX: That would be stupid.
 926  */
 927 void generate_nonce(struct CitContext *con) {
 928         struct timeval tv;
 929
 930         memset(con->cs_nonce, NONCE_SIZE, 0);
 931         gettimeofday(&tv, NULL);
 932         memset(con->cs_nonce, NONCE_SIZE, 0);
 933         snprintf(con->cs_nonce, NONCE_SIZE, "<%d%ld@%s>",
 934                 rand(), (long)tv.tv_usec, config.c_fqdn);
 935 }
 936
 937
 938
 939
 940 /*
 941  * Back-end function for starting a session
 942  */
 943 void begin_session(struct CitContext *con)
 944 {
 945         socklen_t len;
 946         struct sockaddr_in sin;
 947
 948         /*
 949          * Initialize some variables specific to our context.
 950          */
 951         con->logged_in = 0;
 952         con->internal_pgm = 0;
 953         con->download_fp = NULL;
 954         con->upload_fp = NULL;
 955         con->FirstExpressMessage = NULL;
 956         time(&con->lastcmd);
 957         time(&con->lastidle);
 958         strcpy(con->lastcmdname, "    ");
 959         strcpy(con->cs_clientname, "(unknown)");
 960         strcpy(con->curr_user, NLI);
 961         *con->net_node = '\0';
 962         *con->fake_username = '\0';
 963         *con->fake_hostname = '\0';
 964         *con->fake_roomname = '\0';
 965         generate_nonce(con);
 966         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 967         safestrncpy(con->cs_addr, "", sizeof con->cs_addr);
 968         con->cs_host[sizeof con->cs_host - 1] = 0;
 969         len = sizeof sin;
 970         if (!CC->is_local_socket) {
 971                 if (!getpeername(con->client_socket, (struct sockaddr *) &sin, &len)) {
 972                         locate_host(con->cs_host, sizeof con->cs_host,
 973                                 con->cs_addr, sizeof con->cs_addr,
 974                                 &sin.sin_addr
 975                         );
 976                 }
 977         }
 978         else {
 979                 strcpy(con->cs_host, "");
 980         }
 981         con->cs_flags = 0;
 982         con->upload_type = UPL_FILE;
 983         con->dl_is_net = 0;
 984
 985         con->nologin = 0;
 986         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions)) {
 987                 con->nologin = 1;
 988         }
 989
 990         if (!CC->is_local_socket) {
 991                 lprintf(CTDL_NOTICE, "Session started from %s [%s].\n", con->cs_host, con->cs_addr);
 992         }
 993         else {
 994                 lprintf(CTDL_NOTICE, "Session started via local socket.\n");
 995         }
 996
 997         /* Run any session startup routines registered by loadable modules */
 998         PerformSessionHooks(EVT_START);
 999 }
1000
1001
1002 void citproto_begin_session() {
1003         if (CC->nologin==1) {
1004                 cprintf("%d %s: Too many users are already online (maximum is %d)\n",
1005                         ERROR + MAX_SESSIONS_EXCEEDED,
1006                         config.c_nodename, config.c_maxsessions
1007                 );
1008                 CC->kill_me = 1;
1009         }
1010         else {
1011                 cprintf("%d %s Citadel server ready.\n",
1012                         CIT_OK, config.c_nodename);
1013         }
1014 }
1015
1016
1017
1018
1019 /*
1020  * This loop recognizes all server commands.
1021  */
1022 void do_command_loop(void) {
1023         char cmdbuf[SIZ];
1024         const char *old_name = NULL;
1025
1026         old_name = CtdlThreadName("do_command_loop");
1027
1028         time(&CC->lastcmd);
1029         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
1030         if (client_getln(cmdbuf, sizeof cmdbuf) < 1) {
1031                 lprintf(CTDL_ERR, "Client disconnected: ending session.\n");
1032                 CC->kill_me = 1;
1033                 CtdlThreadName(old_name);
1034                 return;
1035         }
1036
1037         /* Log the server command, but don't show passwords... */
1038         if ( (strncasecmp(cmdbuf, "PASS", 4))
1039            && (strncasecmp(cmdbuf, "SETP", 4)) ) {
1040                 lprintf(CTDL_INFO, "%s\n", cmdbuf);
1041         }
1042         else {
1043                 lprintf(CTDL_INFO, "<password command sent>\n");
1044         }
1045
1046         buffer_output();
1047
1048         /*
1049          * Let other clients see the last command we executed, and
1050          * update the idle time, but not NOOP, QNOP, PEXP, GEXP, RWHO, or TIME.
1051          */
1052         if ( (strncasecmp(cmdbuf, "NOOP", 4))
1053            && (strncasecmp(cmdbuf, "QNOP", 4))
1054            && (strncasecmp(cmdbuf, "PEXP", 4))
1055            && (strncasecmp(cmdbuf, "GEXP", 4))
1056            && (strncasecmp(cmdbuf, "RWHO", 4))
1057            && (strncasecmp(cmdbuf, "TIME", 4)) ) {
1058                 strcpy(CC->lastcmdname, "    ");
1059                 safestrncpy(CC->lastcmdname, cmdbuf, sizeof(CC->lastcmdname));
1060                 time(&CC->lastidle);
1061         }
1062
1063         CtdlThreadName(cmdbuf);
1064
1065         if ((strncasecmp(cmdbuf, "ENT0", 4))
1066            && (strncasecmp(cmdbuf, "MESG", 4))
1067            && (strncasecmp(cmdbuf, "MSGS", 4)))
1068         {
1069            CC->cs_flags &= ~CS_POSTING;
1070         }
1071
1072         if (!strncasecmp(cmdbuf, "NOOP", 4)) {
1073                 cprintf("%d%cok\n", CIT_OK, CtdlCheckExpress() );
1074         }
1075
1076         else if (!strncasecmp(cmdbuf, "XYZZY", 5)) {
1077                 cprintf("%d Nothing happens.\n", CIT_OK);
1078         }
1079
1080         else if (!strncasecmp(cmdbuf, "QNOP", 4)) {
1081                 /* do nothing, this command returns no response */
1082         }
1083
1084         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
1085                 cprintf("%d Goodbye.\n", CIT_OK);
1086                 CC->kill_me = 1;
1087         }
1088
1089         else if (!strncasecmp(cmdbuf,"ASYN",4)) {
1090                 cmd_asyn(&cmdbuf[5]);
1091         }
1092
1093         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
1094                 if (CC->logged_in) logout(CC);
1095                 cprintf("%d logged out.\n", CIT_OK);
1096         }
1097
1098         else if (!strncasecmp(cmdbuf,"USER",4)) {
1099                 cmd_user(&cmdbuf[5]);
1100         }
1101
1102         else if (!strncasecmp(cmdbuf,"PASS",4)) {
1103                 cmd_pass(&cmdbuf[5]);
1104         }
1105
1106         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
1107                 cmd_newu(&cmdbuf[5]);
1108         }
1109
1110         else if (!strncasecmp(cmdbuf,"CREU",4)) {
1111                 cmd_creu(&cmdbuf[5]);
1112         }
1113
1114         else if (!strncasecmp(cmdbuf,"SETP",4)) {
1115                 cmd_setp(&cmdbuf[5]);
1116         }
1117
1118         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
1119                 cmd_lrms(&cmdbuf[5]);
1120         }
1121
1122         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
1123                 cmd_lkra(&cmdbuf[5]);
1124         }
1125
1126         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
1127                 cmd_lkrn(&cmdbuf[5]);
1128         }
1129
1130         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
1131                 cmd_lkro(&cmdbuf[5]);
1132         }
1133
1134         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
1135                 cmd_lzrm(&cmdbuf[5]);
1136         }
1137
1138         else if (!strncasecmp(cmdbuf,"LPRM",4)) {
1139                 cmd_lprm(&cmdbuf[5]);
1140         }
1141
1142         else if (!strncasecmp(cmdbuf,"GETU",4)) {
1143                 cmd_getu();
1144         }
1145
1146         else if (!strncasecmp(cmdbuf,"SETU",4)) {
1147                 cmd_setu(&cmdbuf[5]);
1148         }
1149
1150         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
1151                 cmd_goto(&cmdbuf[5]);
1152         }
1153
1154         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
1155                 cmd_msgs(&cmdbuf[5]);
1156         }
1157
1158         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
1159                 cmd_whok();
1160         }
1161
1162         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
1163                 cmd_rdir();
1164         }
1165
1166         else if (!strncasecmp(cmdbuf,"EUID",4)) {
1167                 cmd_euid(&cmdbuf[5]);
1168         }
1169
1170         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
1171                 cmd_msg0(&cmdbuf[5]);
1172         }
1173
1174         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
1175                 cmd_msg2(&cmdbuf[5]);
1176         }
1177
1178         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
1179                 cmd_msg3(&cmdbuf[5]);
1180         }
1181
1182         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
1183                 cmd_msg4(&cmdbuf[5]);
1184         }
1185
1186         else if (!strncasecmp(cmdbuf,"MSGP",4)) {
1187                 cmd_msgp(&cmdbuf[5]);
1188         }
1189
1190         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
1191                 cmd_opna(&cmdbuf[5]);
1192         }
1193
1194         else if (!strncasecmp(cmdbuf,"DLAT",4)) {
1195                 cmd_dlat(&cmdbuf[5]);
1196         }
1197
1198         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1199                 cmd_info();
1200         }
1201
1202         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1203                 cmd_slrp(&cmdbuf[5]);
1204         }
1205
1206         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1207                 cmd_invt_kick(&cmdbuf[5],1);
1208         }
1209
1210         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1211                 cmd_invt_kick(&cmdbuf[5],0);
1212         }
1213
1214         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1215                 cmd_getr();
1216         }
1217
1218         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1219                 cmd_setr(&cmdbuf[5]);
1220         }
1221
1222         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1223                 cmd_geta();
1224         }
1225
1226         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1227                 cmd_seta(&cmdbuf[5]);
1228         }
1229
1230         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1231                 cmd_ent0(&cmdbuf[5]);
1232         }
1233
1234         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1235                 cmd_rinf();
1236         }
1237
1238         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1239                 cmd_dele(&cmdbuf[5]);
1240         }
1241
1242         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1243                 cmd_kill(&cmdbuf[5]);
1244         }
1245
1246         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1247                 cmd_cre8(&cmdbuf[5]);
1248         }
1249
1250         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1251                 cmd_move(&cmdbuf[5]);
1252         }
1253
1254         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1255                 cmd_forg();
1256         }
1257
1258         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1259                 cmd_mesg(&cmdbuf[5]);
1260         }
1261
1262         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1263                 cmd_emsg(&cmdbuf[5]);
1264         }
1265
1266         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1267                 cmd_gnur();
1268         }
1269
1270         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1271                 cmd_vali(&cmdbuf[5]);
1272         }
1273
1274         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1275                 cmd_einf(&cmdbuf[5]);
1276         }
1277
1278         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1279                 cmd_list(&cmdbuf[5]);
1280         }
1281
1282         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1283                 cmd_chek();
1284         }
1285
1286         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1287                 cmd_delf(&cmdbuf[5]);
1288         }
1289
1290         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1291                 cmd_movf(&cmdbuf[5]);
1292         }
1293
1294         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1295                 cmd_netf(&cmdbuf[5]);
1296         }
1297
1298         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1299                 cmd_open(&cmdbuf[5]);
1300         }
1301
1302         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1303                 cmd_clos();
1304         }
1305
1306         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1307                 cmd_uopn(&cmdbuf[5]);
1308         }
1309
1310         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1311                 cmd_ucls(&cmdbuf[5]);
1312         }
1313
1314         else if (!strncasecmp(cmdbuf,"READ",4)) {
1315                 cmd_read(&cmdbuf[5]);
1316         }
1317
1318         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1319                 cmd_writ(&cmdbuf[5]);
1320         }
1321
1322         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1323                 cmd_qusr(&cmdbuf[5]);
1324         }
1325
1326         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1327                 cmd_echo(&cmdbuf[5]);
1328         }
1329
1330         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1331                 cmd_oimg(&cmdbuf[5]);
1332         }
1333
1334         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1335                 cmd_more();
1336         }
1337
1338         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1339                 cmd_ndop(&cmdbuf[5]);
1340         }
1341
1342         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1343                 cmd_nuop(&cmdbuf[5]);
1344         }
1345
1346         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1347                 cmd_lflr();
1348         }
1349
1350         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1351                 cmd_cflr(&cmdbuf[5]);
1352         }
1353
1354         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1355                 cmd_kflr(&cmdbuf[5]);
1356         }
1357
1358         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1359                 cmd_eflr(&cmdbuf[5]);
1360         }
1361
1362         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1363                 cmd_iden(&cmdbuf[5]);
1364         }
1365
1366         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1367                 cmd_ipgm(&cmdbuf[5]);
1368         }
1369
1370         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1371                 cmd_term(&cmdbuf[5]);
1372         }
1373
1374         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1375                 cmd_down(&cmdbuf[5]);
1376         }
1377
1378         else if (!strncasecmp(cmdbuf,"HALT",4)) {
1379                 cmd_halt();
1380         }
1381
1382         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1383                 cmd_scdn(&cmdbuf[5]);
1384         }
1385
1386         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1387                 cmd_uimg(&cmdbuf[5]);
1388         }
1389
1390         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1391                 cmd_time();
1392         }
1393
1394         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1395                 cmd_agup(&cmdbuf[5]);
1396         }
1397
1398         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1399                 cmd_asup(&cmdbuf[5]);
1400         }
1401
1402         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1403                 cmd_gpex(&cmdbuf[5]);
1404         }
1405
1406         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1407                 cmd_spex(&cmdbuf[5]);
1408         }
1409
1410         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1411                 cmd_conf(&cmdbuf[5]);
1412         }
1413
1414         else if (!strncasecmp(cmdbuf, "SEEN", 4)) {
1415                 cmd_seen(&cmdbuf[5]);
1416         }
1417
1418         else if (!strncasecmp(cmdbuf, "GTSN", 4)) {
1419                 cmd_gtsn(&cmdbuf[5]);
1420         }
1421
1422         else if (!strncasecmp(cmdbuf, "VIEW", 4)) {
1423                 cmd_view(&cmdbuf[5]);
1424         }
1425
1426         else if (!strncasecmp(cmdbuf, "ISME", 4)) {
1427                 cmd_isme(&cmdbuf[5]);
1428         }
1429
1430         else if (!strncasecmp(cmdbuf, "RENU", 4)) {
1431                 cmd_renu(&cmdbuf[5]);
1432         }
1433
1434         else if (!DLoader_Exec_Cmd(cmdbuf)) {
1435                 cprintf("%d Unrecognized or unsupported command.\n", ERROR + CMD_NOT_SUPPORTED);
1436         }
1437
1438         unbuffer_output();
1439
1440         /* Run any after-each-command routines registered by modules */
1441         PerformSessionHooks(EVT_CMD);
1442         CtdlThreadName(old_name);
1443 }
1444
1445
1446 /*
1447  * This loop performs all asynchronous functions.
1448  */
1449 void do_async_loop(void) {
1450         PerformSessionHooks(EVT_ASYNC);
1451 }