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 #include "svn_revision.h"
  62
  63 #ifndef HAVE_SNPRINTF
  64 #include "snprintf.h"
  65 #endif
  66
  67 #include "ctdl_module.h"
  68
  69
  70 struct CitContext *ContextList = NULL;
  71 struct CitContext* next_session = NULL;
  72 char *unique_session_numbers;
  73 int ScheduledShutdown = 0;
  74 time_t server_startup_time;
  75 int panic_fd;
  76
  77 /**
  78  * \brief print the actual stack frame.
  79  */
  80 void cit_backtrace(void)
  81 {
  82 #ifdef HAVE_BACKTRACE
  83         void *stack_frames[50];
  84         size_t size, i;
  85         char **strings;
  86
  87
  88         size = backtrace(stack_frames, sizeof(stack_frames) / sizeof(void*));
  89         strings = backtrace_symbols(stack_frames, size);
  90         for (i = 0; i < size; i++) {
  91                 if (strings != NULL)
  92                         CtdlLogPrintf(1, "%s\n", strings[i]);
  93                 else
  94                         CtdlLogPrintf(1, "%p\n", stack_frames[i]);
  95         }
  96         free(strings);
  97 #endif
  98 }
  99
 100 /**
 101  * \brief print the actual stack frame.
 102  */
 103 void cit_panic_backtrace(int SigNum)
 104 {
 105 #ifdef HAVE_BACKTRACE
 106         void *stack_frames[10];
 107         size_t size, i;
 108         char **strings;
 109
 110         printf("caught signal 11\n");
 111         size = backtrace(stack_frames, sizeof(stack_frames) / sizeof(void*));
 112         strings = backtrace_symbols(stack_frames, size);
 113         for (i = 0; i < size; i++) {
 114                 if (strings != NULL)
 115                         CtdlLogPrintf(1, "%s\n", strings[i]);
 116                 else
 117                         CtdlLogPrintf(1, "%p\n", stack_frames[i]);
 118         }
 119         free(strings);
 120 #endif
 121         exit(-1);
 122 }
 123
 124 /*
 125  * Various things that need to be initialized at startup
 126  */
 127 void master_startup(void) {
 128         struct timeval tv;
 129         unsigned int seed;
 130         FILE *urandom;
 131         struct ctdlroom qrbuf;
 132
 133         CtdlLogPrintf(CTDL_DEBUG, "master_startup() started\n");
 134         time(&server_startup_time);
 135
 136         CtdlLogPrintf(CTDL_INFO, "Opening databases\n");
 137         open_databases();
 138
 139         ctdl_thread_internal_init_tsd();
 140
 141         CtdlThreadAllocTSD();
 142
 143         check_ref_counts();
 144
 145         CtdlLogPrintf(CTDL_INFO, "Creating base rooms (if necessary)\n");
 146         create_room(config.c_baseroom,  0, "", 0, 1, 0, VIEW_BBS);
 147         create_room(AIDEROOM,           3, "", 0, 1, 0, VIEW_BBS);
 148         create_room(SYSCONFIGROOM,      3, "", 0, 1, 0, VIEW_BBS);
 149         create_room(config.c_twitroom,  0, "", 0, 1, 0, VIEW_BBS);
 150
 151         /* The "Local System Configuration" room doesn't need to be visible */
 152         if (lgetroom(&qrbuf, SYSCONFIGROOM) == 0) {
 153                 qrbuf.QRflags2 |= QR2_SYSTEM;
 154                 lputroom(&qrbuf);
 155         }
 156
 157         /* Aide needs to be public postable, else we're not RFC conformant. */
 158         if (lgetroom(&qrbuf, AIDEROOM) == 0) {
 159                 qrbuf.QRflags2 |= QR2_SMTP_PUBLIC;
 160                 lputroom(&qrbuf);
 161         }
 162
 163         CtdlLogPrintf(CTDL_INFO, "Seeding the pseudo-random number generator...\n");
 164         urandom = fopen("/dev/urandom", "r");
 165         if (urandom != NULL) {
 166                 fread(&seed, sizeof seed, 1, urandom);
 167                 fclose(urandom);
 168         }
 169         else {
 170                 gettimeofday(&tv, NULL);
 171                 seed = tv.tv_usec;
 172         }
 173         srandom(seed);
 174
 175         CtdlLogPrintf(CTDL_INFO, "Initializing ipgm secret\n");
 176         get_config();
 177         config.c_ipgm_secret = rand();
 178         put_config();
 179
 180         CtdlLogPrintf(CTDL_DEBUG, "master_startup() finished\n");
 181 }
 182
 183
 184 /*
 185  * Cleanup routine to be called when the server is shutting down.
 186  */
 187 void master_cleanup(int exitcode) {
 188         struct CleanupFunctionHook *fcn;
 189         static int already_cleaning_up = 0;
 190
 191         if (already_cleaning_up) while(1) sleep(1);
 192         already_cleaning_up = 1;
 193
 194         /* Run any cleanup routines registered by loadable modules */
 195         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
 196                 (*fcn->h_function_pointer)();
 197         }
 198
 199         /* Close the AdjRefCount queue file */
 200         AdjRefCount(-1, 0);
 201
 202         /* Do system-dependent stuff */
 203         sysdep_master_cleanup();
 204
 205         /* Close databases */
 206         CtdlLogPrintf(CTDL_INFO, "Closing databases\n");
 207         close_databases();
 208
 209 #ifdef DEBUG_MEMORY_LEAKS
 210         dump_heap();
 211 #endif
 212
 213         /* If the operator requested a halt but not an exit, halt here. */
 214         if (shutdown_and_halt) {
 215                 CtdlLogPrintf(CTDL_NOTICE, "citserver: Halting server without exiting.\n");
 216                 fflush(stdout); fflush(stderr);
 217                 while(1) {
 218                         sleep(32767);
 219                 }
 220         }
 221
 222         release_control();
 223
 224         /* Now go away. */
 225         CtdlLogPrintf(CTDL_NOTICE, "citserver: Exiting with status %d\n", exitcode);
 226         fflush(stdout); fflush(stderr);
 227
 228         if (restart_server != 0)
 229                 exit(1);
 230         exit(exitcode);
 231 }
 232
 233
 234
 235 /*
 236  * Terminate a session.
 237  */
 238 void RemoveContext (struct CitContext *con)
 239 {
 240         if (con==NULL) {
 241                 CtdlLogPrintf(CTDL_ERR,
 242                         "WARNING: RemoveContext() called with NULL!\n");
 243                 return;
 244         }
 245         CtdlLogPrintf(CTDL_DEBUG, "RemoveContext() session %d\n", con->cs_pid);
 246
 247         /* Run any cleanup routines registered by loadable modules.
 248          * Note: We have to "become_session()" because the cleanup functions
 249          *       might make references to "CC" assuming it's the right one.
 250          */
 251         become_session(con);
 252         logout();
 253         PerformSessionHooks(EVT_STOP);
 254         become_session(NULL);
 255
 256         CtdlLogPrintf(CTDL_NOTICE, "[%3d] Session ended.\n", con->cs_pid);
 257
 258         /* If the client is still connected, blow 'em away. */
 259         CtdlLogPrintf(CTDL_DEBUG, "Closing socket %d\n", con->client_socket);
 260         close(con->client_socket);
 261
 262         CtdlLogPrintf(CTDL_DEBUG, "Done with RemoveContext()\n");
 263 }
 264
 265
 266
 267
 268
 269 /*
 270  * cmd_info()  -  tell the client about this server
 271  */
 272 void cmd_info(void) {
 273         cprintf("%d Server info:\n", LISTING_FOLLOWS);
 274         cprintf("%d\n", CC->cs_pid);
 275         cprintf("%s\n", config.c_nodename);
 276         cprintf("%s\n", config.c_humannode);
 277         cprintf("%s\n", config.c_fqdn);
 278         cprintf("%s\n", CITADEL);
 279         cprintf("%d\n", REV_LEVEL);
 280         cprintf("%s\n", config.c_site_location);
 281         cprintf("%s\n", config.c_sysadm);
 282         cprintf("%d\n", SERVER_TYPE);
 283         cprintf("%s\n", config.c_moreprompt);
 284         cprintf("1\n"); /* 1 = yes, this system supports floors */
 285         cprintf("1\n"); /* 1 = we support the extended paging options */
 286         cprintf("%s\n", CC->cs_nonce);
 287         cprintf("1\n"); /* 1 = yes, this system supports the QNOP command */
 288
 289 #ifdef HAVE_LDAP
 290         cprintf("1\n"); /* 1 = yes, this server is LDAP-enabled */
 291 #else
 292         cprintf("0\n"); /* 1 = no, this server is not LDAP-enabled */
 293 #endif
 294
 295         if (config.c_auth_mode == AUTHMODE_NATIVE) {
 296                 cprintf("%d\n", config.c_disable_newu);
 297         }
 298         else {
 299                 cprintf("1\n"); /* "create new user" does not work with non-native auth modes */
 300         }
 301
 302         cprintf("%s\n", config.c_default_cal_zone);
 303
 304         /* Output load averages */
 305         cprintf("%f\n", CtdlThreadLoadAvg);
 306         cprintf("%f\n", CtdlThreadWorkerAvg);
 307         cprintf("%d\n", CtdlThreadGetCount());
 308
 309         cprintf("1\n");         /* yes, Sieve mail filtering is supported */
 310         cprintf("%d\n", config.c_enable_fulltext);
 311         cprintf("%s\n", svn_revision());
 312
 313         cprintf("000\n");
 314 }
 315
 316
 317 /*
 318  * returns an asterisk if there are any instant messages waiting,
 319  * space otherwise.
 320  */
 321 char CtdlCheckExpress(void) {
 322         if (CC->FirstExpressMessage == NULL) {
 323                 return(' ');
 324         }
 325         else {
 326                 return('*');
 327         }
 328 }
 329
 330 void cmd_time(void)
 331 {
 332    time_t tv;
 333    struct tm tmp;
 334
 335    tv = time(NULL);
 336    localtime_r(&tv, &tmp);
 337
 338    /* timezone and daylight global variables are not portable. */
 339 #ifdef HAVE_STRUCT_TM_TM_GMTOFF
 340    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, tmp.tm_gmtoff, tmp.tm_isdst);
 341 #else
 342    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, timezone, tmp.tm_isdst);
 343 #endif
 344 }
 345
 346
 347 /*
 348  * Check originating host against the public_clients file.  This determines
 349  * whether the client is allowed to change the hostname for this session
 350  * (for example, to show the location of the user rather than the location
 351  * of the client).
 352  */
 353 int is_public_client(void)
 354 {
 355         char buf[1024];
 356         char addrbuf[1024];
 357         FILE *fp;
 358         int i;
 359         char *public_clientspos;
 360         char *public_clientsend;
 361         char *paddr = NULL;
 362         struct stat statbuf;
 363         static time_t pc_timestamp = 0;
 364         static char public_clients[SIZ];
 365         static char public_clients_file[SIZ];
 366
 367 #define LOCALHOSTSTR "127.0.0.1"
 368
 369         snprintf(public_clients_file,
 370                          sizeof public_clients_file,
 371                          "%s/public_clients",
 372                          ctdl_etc_dir);
 373
 374         /*
 375          * Check the time stamp on the public_clients file.  If it's been
 376          * updated since the last time we were here (or if this is the first
 377          * time we've been through the loop), read its contents and learn
 378          * the IP addresses of the listed hosts.
 379          */
 380         if (stat(public_clients_file, &statbuf) != 0) {
 381                 /* No public_clients file exists, so bail out */
 382                 CtdlLogPrintf(CTDL_WARNING, "Warning: '%s' does not exist\n",
 383                                 public_clients_file);
 384                 return(0);
 385         }
 386
 387         if (statbuf.st_mtime > pc_timestamp) {
 388                 begin_critical_section(S_PUBLIC_CLIENTS);
 389                 CtdlLogPrintf(CTDL_INFO, "Loading %s\n", public_clients_file);
 390
 391                 public_clientspos = &public_clients[0];
 392                 public_clientsend = public_clientspos + SIZ;
 393                 safestrncpy(public_clientspos, LOCALHOSTSTR, sizeof public_clients);
 394                 public_clientspos += sizeof(LOCALHOSTSTR) - 1;
 395
 396                 if (hostname_to_dotted_quad(addrbuf, config.c_fqdn) == 0) {
 397                         *(public_clientspos++) = '|';
 398                         paddr = &addrbuf[0];
 399                         while (!IsEmptyStr (paddr) &&
 400                                (public_clientspos < public_clientsend))
 401                                 *(public_clientspos++) = *(paddr++);
 402                 }
 403
 404                 fp = fopen(public_clients_file, "r");
 405                 if (fp != NULL)
 406                         while ((fgets(buf, sizeof buf, fp)!=NULL) &&
 407                                (public_clientspos < public_clientsend)){
 408                                 char *ptr;
 409                                 ptr = buf;
 410                                 while (!IsEmptyStr(ptr)) {
 411                                         if (*ptr == '#') {
 412                                                 *ptr = 0;
 413                                                 break;
 414                                         }
 415                                 else ptr++;
 416                                 }
 417                                 ptr--;
 418                                 while (ptr>buf && isspace(*ptr)) {
 419                                         *(ptr--) = 0;
 420                                 }
 421                                 if (hostname_to_dotted_quad(addrbuf, buf) == 0) {
 422                                         *(public_clientspos++) = '|';
 423                                         paddr = addrbuf;
 424                                         while (!IsEmptyStr(paddr) &&
 425                                                (public_clientspos < public_clientsend)){
 426                                                 *(public_clientspos++) = *(paddr++);
 427                                         }
 428                                 }
 429                         }
 430                 fclose(fp);
 431                 pc_timestamp = time(NULL);
 432                 end_critical_section(S_PUBLIC_CLIENTS);
 433         }
 434
 435         CtdlLogPrintf(CTDL_DEBUG, "Checking whether %s is a local or public client\n",
 436                 CC->cs_addr);
 437         for (i=0; i<num_parms(public_clients); ++i) {
 438                 extract_token(addrbuf, public_clients, i, '|', sizeof addrbuf);
 439                 if (!strcasecmp(CC->cs_addr, addrbuf)) {
 440                         CtdlLogPrintf(CTDL_DEBUG, "... yes it is.\n");
 441                         return(1);
 442                 }
 443         }
 444
 445         /* No hits.  This is not a public client. */
 446         CtdlLogPrintf(CTDL_DEBUG, "... no it isn't.\n");
 447         return(0);
 448 }
 449
 450
 451 /*
 452  * the client is identifying itself to the server
 453  */
 454 void cmd_iden(char *argbuf)
 455 {
 456         int dev_code;
 457         int cli_code;
 458         int rev_level;
 459         char desc[128];
 460         char from_host[128];
 461         struct in_addr addr;
 462         int do_lookup = 0;
 463
 464         if (num_parms(argbuf)<4) {
 465                 cprintf("%d usage error\n", ERROR + ILLEGAL_VALUE);
 466                 return;
 467         }
 468
 469         dev_code = extract_int(argbuf,0);
 470         cli_code = extract_int(argbuf,1);
 471         rev_level = extract_int(argbuf,2);
 472         extract_token(desc, argbuf, 3, '|', sizeof desc);
 473
 474         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 475         from_host[sizeof from_host - 1] = 0;
 476         if (num_parms(argbuf)>=5) extract_token(from_host, argbuf, 4, '|', sizeof from_host);
 477
 478         CC->cs_clientdev = dev_code;
 479         CC->cs_clienttyp = cli_code;
 480         CC->cs_clientver = rev_level;
 481         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 482         CC->cs_clientname[31] = 0;
 483
 484         if (!IsEmptyStr(from_host)) {
 485                 if (CC->is_local_socket) do_lookup = 1;
 486                 else if (is_public_client()) do_lookup = 1;
 487         }
 488
 489         if (do_lookup) {
 490                 CtdlLogPrintf(CTDL_DEBUG, "Looking up hostname '%s'\n", from_host);
 491                 if ((addr.s_addr = inet_addr(from_host)) != -1) {
 492                         locate_host(CC->cs_host, sizeof CC->cs_host,
 493                                 CC->cs_addr, sizeof CC->cs_addr,
 494                                 &addr);
 495                 }
 496                 else {
 497                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 498                         CC->cs_host[sizeof CC->cs_host - 1] = 0;
 499                 }
 500         }
 501
 502         CtdlLogPrintf(CTDL_NOTICE, "Client %d/%d/%01d.%02d (%s) from %s\n",
 503                 dev_code,
 504                 cli_code,
 505                 (rev_level / 100),
 506                 (rev_level % 100),
 507                 desc,
 508                 CC->cs_host);
 509         cprintf("%d Ok\n",CIT_OK);
 510 }
 511
 512
 513 /*
 514  * display system messages or help
 515  */
 516 void cmd_mesg(char *mname)
 517 {
 518         FILE *mfp;
 519         char targ[256];
 520         char buf[256];
 521         char buf2[256];
 522         char *dirs[2];
 523         DIR *dp;
 524         struct dirent *d;
 525
 526         extract_token(buf, mname, 0, '|', sizeof buf);
 527
 528         dirs[0] = strdup(ctdl_message_dir);
 529         dirs[1] = strdup(ctdl_hlp_dir);
 530
 531         snprintf(buf2, sizeof buf2, "%s.%d.%d",
 532                 buf, CC->cs_clientdev, CC->cs_clienttyp);
 533
 534         /* If the client requested "?" then produce a listing */
 535         if (!strcmp(buf, "?")) {
 536                 cprintf("%d %s\n", LISTING_FOLLOWS, buf);
 537                 dp = opendir(dirs[1]);
 538                 if (dp != NULL) {
 539                         while (d = readdir(dp), d != NULL) {
 540                                 if (d->d_name[0] != '.') {
 541                                         cprintf(" %s\n", d->d_name);
 542                                 }
 543                         }
 544                         closedir(dp);
 545                 }
 546                 cprintf("000\n");
 547                 free(dirs[0]);
 548                 free(dirs[1]);
 549                 return;
 550         }
 551
 552         /* Otherwise, look for the requested file by name. */
 553         else {
 554                 mesg_locate(targ, sizeof targ, buf2, 2, (const char **)dirs);
 555                 if (IsEmptyStr(targ)) {
 556                         snprintf(buf2, sizeof buf2, "%s.%d",
 557                                                         buf, CC->cs_clientdev);
 558                         mesg_locate(targ, sizeof targ, buf2, 2,
 559                                                         (const char **)dirs);
 560                         if (IsEmptyStr(targ)) {
 561                                 mesg_locate(targ, sizeof targ, buf, 2,
 562                                                         (const char **)dirs);
 563                         }
 564                 }
 565         }
 566
 567         free(dirs[0]);
 568         free(dirs[1]);
 569
 570         if (IsEmptyStr(targ)) {
 571                 cprintf("%d '%s' not found.  (Searching in %s and %s)\n",
 572                         ERROR + FILE_NOT_FOUND,
 573                         mname,
 574                         ctdl_message_dir,
 575                         ctdl_hlp_dir
 576                 );
 577                 return;
 578         }
 579
 580         mfp = fopen(targ, "r");
 581         if (mfp==NULL) {
 582                 cprintf("%d Cannot open '%s': %s\n",
 583                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
 584                 return;
 585         }
 586         cprintf("%d %s\n", LISTING_FOLLOWS,buf);
 587
 588         while (fgets(buf, (sizeof buf - 1), mfp) != NULL) {
 589                 buf[strlen(buf)-1] = 0;
 590                 do_help_subst(buf);
 591                 cprintf("%s\n",buf);
 592         }
 593
 594         fclose(mfp);
 595         cprintf("000\n");
 596 }
 597
 598
 599 /*
 600  * enter system messages or help
 601  */
 602 void cmd_emsg(char *mname)
 603 {
 604         FILE *mfp;
 605         char targ[256];
 606         char buf[256];
 607         char *dirs[2];
 608         int a;
 609
 610         unbuffer_output();
 611
 612         if (CtdlAccessCheck(ac_aide)) return;
 613
 614         extract_token(buf, mname, 0, '|', sizeof buf);
 615         for (a=0; !IsEmptyStr(&buf[a]); ++a) {          /* security measure */
 616                 if (buf[a] == '/') buf[a] = '.';
 617         }
 618
 619         dirs[0] = strdup(ctdl_message_dir);
 620         dirs[1] = strdup(ctdl_hlp_dir);
 621
 622         mesg_locate(targ, sizeof targ, buf, 2, (const char**)dirs);
 623         free(dirs[0]);
 624         free(dirs[1]);
 625
 626         if (IsEmptyStr(targ)) {
 627                 snprintf(targ, sizeof targ,
 628                                  "%s/%s",
 629                                  ctdl_hlp_dir, buf);
 630         }
 631
 632         mfp = fopen(targ,"w");
 633         if (mfp==NULL) {
 634                 cprintf("%d Cannot open '%s': %s\n",
 635                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
 636                 return;
 637         }
 638         cprintf("%d %s\n", SEND_LISTING, targ);
 639
 640         while (client_getln(buf, sizeof buf) >=0 && strcmp(buf, "000")) {
 641                 fprintf(mfp, "%s\n", buf);
 642         }
 643
 644         fclose(mfp);
 645 }
 646
 647
 648 /* Don't show the names of private rooms unless the viewing
 649  * user also knows the rooms.
 650  */
 651 void GenerateRoomDisplay(char *real_room,
 652                         struct CitContext *viewed,
 653                         struct CitContext *viewer) {
 654
 655         int ra;
 656
 657         strcpy(real_room, viewed->room.QRname);
 658         if (viewed->room.QRflags & QR_MAILBOX) {
 659                 strcpy(real_room, &real_room[11]);
 660         }
 661         if (viewed->room.QRflags & QR_PRIVATE) {
 662                 CtdlRoomAccess(&viewed->room, &viewer->user, &ra, NULL);
 663                 if ( (ra & UA_KNOWN) == 0) {
 664                         strcpy(real_room, "<private room>");
 665                 }
 666         }
 667
 668         if (viewed->cs_flags & CS_CHAT) {
 669                 while (strlen(real_room) < 14) {
 670                         strcat(real_room, " ");
 671                 }
 672                 strcpy(&real_room[14], "<chat>");
 673         }
 674
 675 }
 676
 677 /*
 678  * Convenience function.
 679  */
 680 int CtdlAccessCheck(int required_level) {
 681
 682         if (CC->internal_pgm) return(0);
 683         if (required_level >= ac_internal) {
 684                 cprintf("%d This is not a user-level command.\n",
 685                         ERROR + HIGHER_ACCESS_REQUIRED);
 686                 return(-1);
 687         }
 688
 689         if ((required_level >= ac_logged_in) && (CC->logged_in == 0)) {
 690                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 691                 return(-1);
 692         }
 693
 694         if (CC->user.axlevel >= 6) return(0);
 695         if (required_level >= ac_aide) {
 696                 cprintf("%d This command requires Aide access.\n",
 697                         ERROR + HIGHER_ACCESS_REQUIRED);
 698                 return(-1);
 699         }
 700
 701         if (is_room_aide()) return(0);
 702         if (required_level >= ac_room_aide) {
 703                 cprintf("%d This command requires Aide or Room Aide access.\n",
 704                         ERROR + HIGHER_ACCESS_REQUIRED);
 705                 return(-1);
 706         }
 707
 708         /* shhh ... succeed quietly */
 709         return(0);
 710 }
 711
 712
 713
 714 /*
 715  * Terminate another running session
 716  */
 717 void cmd_term(char *cmdbuf)
 718 {
 719         int session_num;
 720         struct CitContext *ccptr;
 721         int found_it = 0;
 722         int allowed = 0;
 723
 724         session_num = extract_int(cmdbuf, 0);
 725         if (session_num == CC->cs_pid) {
 726                 cprintf("%d You can't kill your own session.\n", ERROR + ILLEGAL_VALUE);
 727                 return;
 728         }
 729
 730         CtdlLogPrintf(CTDL_DEBUG, "Locating session to kill\n");
 731         begin_critical_section(S_SESSION_TABLE);
 732         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 733                 if (session_num == ccptr->cs_pid) {
 734                         found_it = 1;
 735                         if ((ccptr->user.usernum == CC->user.usernum)
 736                            || (CC->user.axlevel >= 6)) {
 737                                 allowed = 1;
 738                                 ccptr->kill_me = 1;
 739                         }
 740                         else {
 741                                 allowed = 0;
 742                         }
 743                 }
 744         }
 745         end_critical_section(S_SESSION_TABLE);
 746
 747         if (found_it) {
 748                 if (allowed) {
 749                         cprintf("%d Session terminated.\n", CIT_OK);
 750                 }
 751                 else {
 752                         cprintf("%d You are not allowed to do that.\n",
 753                                 ERROR + HIGHER_ACCESS_REQUIRED);
 754                 }
 755         }
 756         else {
 757                 cprintf("%d No such session.\n", ERROR + ILLEGAL_VALUE);
 758         }
 759 }
 760
 761
 762
 763
 764
 765 /*
 766  * get the paginator prompt
 767  */
 768 void cmd_more(void) {
 769         cprintf("%d %s\n", CIT_OK, config.c_moreprompt);
 770 }
 771
 772 /*
 773  * echo
 774  */
 775 void cmd_echo(char *etext)
 776 {
 777         cprintf("%d %s\n", CIT_OK, etext);
 778 }
 779
 780
 781
 782 /*
 783  * identify as internal program
 784  */
 785 void cmd_ipgm(char *argbuf)
 786 {
 787         int secret;
 788
 789         secret = extract_int(argbuf, 0);
 790
 791         /* For security reasons, we do NOT allow this command to run
 792          * over the network.  Local sockets only.
 793          */
 794         if (!CC->is_local_socket) {
 795                 sleep(5);
 796                 cprintf("%d Authentication failed.\n",
 797                         ERROR + PASSWORD_REQUIRED);
 798         }
 799         else if (secret == config.c_ipgm_secret) {
 800                 CC->internal_pgm = 1;
 801                 strcpy(CC->curr_user, "<internal program>");
 802                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 803                 cprintf("%d Authenticated as an internal program.\n", CIT_OK);
 804         }
 805         else {
 806                 sleep(5);
 807                 cprintf("%d Authentication failed.\n",
 808                         ERROR + PASSWORD_REQUIRED);
 809                 CtdlLogPrintf(CTDL_ERR, "Warning: ipgm authentication failed.\n");
 810                 CC->kill_me = 1;
 811         }
 812
 813         /* Now change the ipgm secret for the next round.
 814          * (Disabled because it breaks concurrent scripts.  The fact that
 815          * we no longer accept IPGM over the network should be sufficient
 816          * to prevent brute-force attacks.  If you don't agree, uncomment
 817          * this block.)
 818         get_config();
 819         config.c_ipgm_secret = rand();
 820         put_config();
 821         */
 822 }
 823
 824
 825 /*
 826  * Shut down the server
 827  */
 828 void cmd_down(char *argbuf) {
 829         char *Reply ="%d Shutting down server.  Goodbye.\n";
 830
 831         if (CtdlAccessCheck(ac_aide)) return;
 832
 833         if (!IsEmptyStr(argbuf))
 834         {
 835                 int state = CIT_OK;
 836                 restart_server = extract_int(argbuf, 0);
 837
 838                 if (restart_server > 0)
 839                         Reply = "%d Restarting server.  See you soon.\n";
 840                 if ((restart_server > 0) && !running_as_daemon)
 841                 {
 842                         CtdlLogPrintf(CTDL_ERR, "The user requested restart, but not running as deamon! Geronimooooooo!\n");
 843                         Reply = "%d Warning, not running in deamon mode. maybe we will come up again, but don't lean on it.\n";
 844                         state = ERROR;
 845                 }
 846                 cprintf(Reply, state);
 847         }
 848         else
 849         {
 850                 cprintf(Reply, CIT_OK + SERVER_SHUTTING_DOWN);
 851         }
 852         CtdlThreadStopAll();
 853 }
 854
 855 /*
 856  * Halt the server without exiting the server process.
 857  */
 858 void cmd_halt(void) {
 859
 860         if (CtdlAccessCheck(ac_aide)) return;
 861
 862         cprintf("%d Halting server.  Goodbye.\n", CIT_OK);
 863         CtdlThreadStopAll();
 864         shutdown_and_halt = 1;
 865 }
 866
 867 /*
 868  * Schedule or cancel a server shutdown
 869  */
 870 void cmd_scdn(char *argbuf)
 871 {
 872         int new_state;
 873         int state = CIT_OK;
 874         char *Reply = "%d %d\n";
 875
 876         if (CtdlAccessCheck(ac_aide)) return;
 877
 878         new_state = extract_int(argbuf, 0);
 879         if ((new_state == 2) || (new_state == 3))
 880         {
 881                 restart_server = 1;
 882                 if (!running_as_daemon)
 883                 {
 884                         CtdlLogPrintf(CTDL_ERR, "The user requested restart, but not running as deamon! Geronimooooooo!\n");
 885                         Reply = "%d %d Warning, not running in deamon mode. maybe we will come up again, but don't lean on it.\n";
 886                         state = ERROR;
 887                 }
 888
 889                 restart_server = extract_int(argbuf, 0);
 890                 new_state -= 2;
 891         }
 892         if ((new_state == 0) || (new_state == 1)) {
 893                 ScheduledShutdown = new_state;
 894         }
 895         cprintf(Reply, state, ScheduledShutdown);
 896 }
 897
 898
 899 /*
 900  * Set or unset asynchronous protocol mode
 901  */
 902 void cmd_asyn(char *argbuf)
 903 {
 904         int new_state;
 905
 906         new_state = extract_int(argbuf, 0);
 907         if ((new_state == 0) || (new_state == 1)) {
 908                 CC->is_async = new_state;
 909         }
 910         cprintf("%d %d\n", CIT_OK, CC->is_async);
 911 }
 912
 913
 914 /*
 915  * Generate a "nonce" for APOP-style authentication.
 916  *
 917  * RFC 1725 et al specify a PID to be placed in front of the nonce.
 918  * Quoth BTX: That would be stupid.
 919  */
 920 void generate_nonce(struct CitContext *con) {
 921         struct timeval tv;
 922
 923         memset(con->cs_nonce, NONCE_SIZE, 0);
 924         gettimeofday(&tv, NULL);
 925         memset(con->cs_nonce, NONCE_SIZE, 0);
 926         snprintf(con->cs_nonce, NONCE_SIZE, "<%d%ld@%s>",
 927                 rand(), (long)tv.tv_usec, config.c_fqdn);
 928 }
 929
 930
 931
 932
 933 /*
 934  * Back-end function for starting a session
 935  */
 936 void begin_session(struct CitContext *con)
 937 {
 938         socklen_t len;
 939         struct sockaddr_in sin;
 940
 941         /*
 942          * Initialize some variables specific to our context.
 943          */
 944         con->logged_in = 0;
 945         con->internal_pgm = 0;
 946         con->download_fp = NULL;
 947         con->upload_fp = NULL;
 948         con->FirstExpressMessage = NULL;
 949         time(&con->lastcmd);
 950         time(&con->lastidle);
 951         strcpy(con->lastcmdname, "    ");
 952         strcpy(con->cs_clientname, "(unknown)");
 953         strcpy(con->curr_user, NLI);
 954         *con->net_node = '\0';
 955         *con->fake_username = '\0';
 956         *con->fake_hostname = '\0';
 957         *con->fake_roomname = '\0';
 958         generate_nonce(con);
 959         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 960         safestrncpy(con->cs_addr, "", sizeof con->cs_addr);
 961         con->cs_host[sizeof con->cs_host - 1] = 0;
 962         len = sizeof sin;
 963         if (!CC->is_local_socket) {
 964                 if (!getpeername(con->client_socket, (struct sockaddr *) &sin, &len)) {
 965                         locate_host(con->cs_host, sizeof con->cs_host,
 966                                 con->cs_addr, sizeof con->cs_addr,
 967                                 &sin.sin_addr
 968                         );
 969                 }
 970         }
 971         else {
 972                 strcpy(con->cs_host, "");
 973         }
 974         con->cs_flags = 0;
 975         con->upload_type = UPL_FILE;
 976         con->dl_is_net = 0;
 977
 978         con->nologin = 0;
 979         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions)) {
 980                 con->nologin = 1;
 981         }
 982
 983         if (!CC->is_local_socket) {
 984                 CtdlLogPrintf(CTDL_NOTICE, "Session started from %s [%s].\n", con->cs_host, con->cs_addr);
 985         }
 986         else {
 987                 CtdlLogPrintf(CTDL_NOTICE, "Session started via local socket.\n");
 988         }
 989
 990         /* Run any session startup routines registered by loadable modules */
 991         PerformSessionHooks(EVT_START);
 992 }
 993
 994
 995 void citproto_begin_session() {
 996         if (CC->nologin==1) {
 997                 cprintf("%d %s: Too many users are already online (maximum is %d)\n",
 998                         ERROR + MAX_SESSIONS_EXCEEDED,
 999                         config.c_nodename, config.c_maxsessions
1000                 );
1001                 CC->kill_me = 1;
1002         }
1003         else {
1004                 cprintf("%d %s Citadel server ready.\n",
1005                         CIT_OK, config.c_nodename);
1006         }
1007 }
1008
1009
1010
1011
1012 /*
1013  * This loop recognizes all server commands.
1014  */
1015 void do_command_loop(void) {
1016         char cmdbuf[SIZ];
1017         const char *old_name = NULL;
1018
1019         old_name = CtdlThreadName("do_command_loop");
1020
1021         time(&CC->lastcmd);
1022         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
1023         if (client_getln(cmdbuf, sizeof cmdbuf) < 1) {
1024                 CtdlLogPrintf(CTDL_ERR, "Client disconnected: ending session.\n");
1025                 CC->kill_me = 1;
1026                 CtdlThreadName(old_name);
1027                 return;
1028         }
1029
1030         /* Log the server command, but don't show passwords... */
1031         if ( (strncasecmp(cmdbuf, "PASS", 4))
1032            && (strncasecmp(cmdbuf, "SETP", 4)) ) {
1033                 CtdlLogPrintf(CTDL_INFO, "%s\n", cmdbuf);
1034         }
1035         else {
1036                 CtdlLogPrintf(CTDL_INFO, "<password command sent>\n");
1037         }
1038
1039         buffer_output();
1040
1041         /*
1042          * Let other clients see the last command we executed, and
1043          * update the idle time, but not NOOP, QNOP, PEXP, GEXP, RWHO, or TIME.
1044          */
1045         if ( (strncasecmp(cmdbuf, "NOOP", 4))
1046            && (strncasecmp(cmdbuf, "QNOP", 4))
1047            && (strncasecmp(cmdbuf, "PEXP", 4))
1048            && (strncasecmp(cmdbuf, "GEXP", 4))
1049            && (strncasecmp(cmdbuf, "RWHO", 4))
1050            && (strncasecmp(cmdbuf, "TIME", 4)) ) {
1051                 strcpy(CC->lastcmdname, "    ");
1052                 safestrncpy(CC->lastcmdname, cmdbuf, sizeof(CC->lastcmdname));
1053                 time(&CC->lastidle);
1054         }
1055
1056         CtdlThreadName(cmdbuf);
1057
1058         if ((strncasecmp(cmdbuf, "ENT0", 4))
1059            && (strncasecmp(cmdbuf, "MESG", 4))
1060            && (strncasecmp(cmdbuf, "MSGS", 4)))
1061         {
1062            CC->cs_flags &= ~CS_POSTING;
1063         }
1064
1065         if (!strncasecmp(cmdbuf, "NOOP", 4)) {
1066                 cprintf("%d%cok\n", CIT_OK, CtdlCheckExpress() );
1067         }
1068
1069         else if (!strncasecmp(cmdbuf, "XYZZY", 5)) {
1070                 cprintf("%d Nothing happens.\n", CIT_OK);
1071         }
1072
1073         else if (!strncasecmp(cmdbuf, "QNOP", 4)) {
1074                 /* do nothing, this command returns no response */
1075         }
1076
1077         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
1078                 cprintf("%d Goodbye.\n", CIT_OK);
1079                 CC->kill_me = 1;
1080         }
1081
1082         else if (!strncasecmp(cmdbuf,"ASYN",4)) {
1083                 cmd_asyn(&cmdbuf[5]);
1084         }
1085
1086         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
1087                 if (CC->logged_in) logout();
1088                 cprintf("%d logged out.\n", CIT_OK);
1089         }
1090
1091         else if (!strncasecmp(cmdbuf,"USER",4)) {
1092                 cmd_user(&cmdbuf[5]);
1093         }
1094
1095         else if (!strncasecmp(cmdbuf,"PASS",4)) {
1096                 cmd_pass(&cmdbuf[5]);
1097         }
1098
1099         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
1100                 cmd_newu(&cmdbuf[5]);
1101         }
1102
1103         else if (!strncasecmp(cmdbuf,"CREU",4)) {
1104                 cmd_creu(&cmdbuf[5]);
1105         }
1106
1107         else if (!strncasecmp(cmdbuf,"SETP",4)) {
1108                 cmd_setp(&cmdbuf[5]);
1109         }
1110
1111         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
1112                 cmd_lrms(&cmdbuf[5]);
1113         }
1114
1115         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
1116                 cmd_lkra(&cmdbuf[5]);
1117         }
1118
1119         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
1120                 cmd_lkrn(&cmdbuf[5]);
1121         }
1122
1123         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
1124                 cmd_lkro(&cmdbuf[5]);
1125         }
1126
1127         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
1128                 cmd_lzrm(&cmdbuf[5]);
1129         }
1130
1131         else if (!strncasecmp(cmdbuf,"LPRM",4)) {
1132                 cmd_lprm(&cmdbuf[5]);
1133         }
1134
1135         else if (!strncasecmp(cmdbuf,"GETU",4)) {
1136                 cmd_getu();
1137         }
1138
1139         else if (!strncasecmp(cmdbuf,"SETU",4)) {
1140                 cmd_setu(&cmdbuf[5]);
1141         }
1142
1143         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
1144                 cmd_goto(&cmdbuf[5]);
1145         }
1146
1147         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
1148                 cmd_msgs(&cmdbuf[5]);
1149         }
1150
1151         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
1152                 cmd_whok();
1153         }
1154
1155         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
1156                 cmd_rdir();
1157         }
1158
1159         else if (!strncasecmp(cmdbuf,"EUID",4)) {
1160                 cmd_euid(&cmdbuf[5]);
1161         }
1162
1163         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
1164                 cmd_msg0(&cmdbuf[5]);
1165         }
1166
1167         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
1168                 cmd_msg2(&cmdbuf[5]);
1169         }
1170
1171         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
1172                 cmd_msg3(&cmdbuf[5]);
1173         }
1174
1175         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
1176                 cmd_msg4(&cmdbuf[5]);
1177         }
1178
1179         else if (!strncasecmp(cmdbuf,"MSGP",4)) {
1180                 cmd_msgp(&cmdbuf[5]);
1181         }
1182
1183         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
1184                 cmd_opna(&cmdbuf[5]);
1185         }
1186
1187         else if (!strncasecmp(cmdbuf,"DLAT",4)) {
1188                 cmd_dlat(&cmdbuf[5]);
1189         }
1190
1191         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1192                 cmd_info();
1193         }
1194
1195         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1196                 cmd_slrp(&cmdbuf[5]);
1197         }
1198
1199         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1200                 cmd_invt_kick(&cmdbuf[5],1);
1201         }
1202
1203         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1204                 cmd_invt_kick(&cmdbuf[5],0);
1205         }
1206
1207         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1208                 cmd_getr();
1209         }
1210
1211         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1212                 cmd_setr(&cmdbuf[5]);
1213         }
1214
1215         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1216                 cmd_geta();
1217         }
1218
1219         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1220                 cmd_seta(&cmdbuf[5]);
1221         }
1222
1223         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1224                 cmd_ent0(&cmdbuf[5]);
1225         }
1226
1227         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1228                 cmd_rinf();
1229         }
1230
1231         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1232                 cmd_dele(&cmdbuf[5]);
1233         }
1234
1235         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1236                 cmd_kill(&cmdbuf[5]);
1237         }
1238
1239         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1240                 cmd_cre8(&cmdbuf[5]);
1241         }
1242
1243         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1244                 cmd_move(&cmdbuf[5]);
1245         }
1246
1247         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1248                 cmd_forg();
1249         }
1250
1251         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1252                 cmd_mesg(&cmdbuf[5]);
1253         }
1254
1255         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1256                 cmd_emsg(&cmdbuf[5]);
1257         }
1258
1259         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1260                 cmd_gnur();
1261         }
1262
1263         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1264                 cmd_vali(&cmdbuf[5]);
1265         }
1266
1267         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1268                 cmd_einf(&cmdbuf[5]);
1269         }
1270
1271         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1272                 cmd_list(&cmdbuf[5]);
1273         }
1274
1275         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1276                 cmd_chek();
1277         }
1278
1279         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1280                 cmd_delf(&cmdbuf[5]);
1281         }
1282
1283         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1284                 cmd_movf(&cmdbuf[5]);
1285         }
1286
1287         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1288                 cmd_netf(&cmdbuf[5]);
1289         }
1290
1291         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1292                 cmd_open(&cmdbuf[5]);
1293         }
1294
1295         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1296                 cmd_clos();
1297         }
1298
1299         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1300                 cmd_uopn(&cmdbuf[5]);
1301         }
1302
1303         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1304                 cmd_ucls(&cmdbuf[5]);
1305         }
1306
1307         else if (!strncasecmp(cmdbuf,"READ",4)) {
1308                 cmd_read(&cmdbuf[5]);
1309         }
1310
1311         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1312                 cmd_writ(&cmdbuf[5]);
1313         }
1314
1315         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1316                 cmd_qusr(&cmdbuf[5]);
1317         }
1318
1319         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1320                 cmd_echo(&cmdbuf[5]);
1321         }
1322
1323         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1324                 cmd_oimg(&cmdbuf[5]);
1325         }
1326
1327         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1328                 cmd_more();
1329         }
1330
1331         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1332                 cmd_ndop(&cmdbuf[5]);
1333         }
1334
1335         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1336                 cmd_nuop(&cmdbuf[5]);
1337         }
1338
1339         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1340                 cmd_lflr();
1341         }
1342
1343         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1344                 cmd_cflr(&cmdbuf[5]);
1345         }
1346
1347         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1348                 cmd_kflr(&cmdbuf[5]);
1349         }
1350
1351         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1352                 cmd_eflr(&cmdbuf[5]);
1353         }
1354
1355         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1356                 cmd_iden(&cmdbuf[5]);
1357         }
1358
1359         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1360                 cmd_ipgm(&cmdbuf[5]);
1361         }
1362
1363         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1364                 cmd_term(&cmdbuf[5]);
1365         }
1366
1367         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1368                 cmd_down(&cmdbuf[5]);
1369         }
1370
1371         else if (!strncasecmp(cmdbuf,"HALT",4)) {
1372                 cmd_halt();
1373         }
1374
1375         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1376                 cmd_scdn(&cmdbuf[5]);
1377         }
1378
1379         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1380                 cmd_uimg(&cmdbuf[5]);
1381         }
1382
1383         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1384                 cmd_time();
1385         }
1386
1387         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1388                 cmd_agup(&cmdbuf[5]);
1389         }
1390
1391         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1392                 cmd_asup(&cmdbuf[5]);
1393         }
1394
1395         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1396                 cmd_gpex(&cmdbuf[5]);
1397         }
1398
1399         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1400                 cmd_spex(&cmdbuf[5]);
1401         }
1402
1403         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1404                 cmd_conf(&cmdbuf[5]);
1405         }
1406
1407         else if (!strncasecmp(cmdbuf, "SEEN", 4)) {
1408                 cmd_seen(&cmdbuf[5]);
1409         }
1410
1411         else if (!strncasecmp(cmdbuf, "GTSN", 4)) {
1412                 cmd_gtsn(&cmdbuf[5]);
1413         }
1414
1415         else if (!strncasecmp(cmdbuf, "VIEW", 4)) {
1416                 cmd_view(&cmdbuf[5]);
1417         }
1418
1419         else if (!strncasecmp(cmdbuf, "ISME", 4)) {
1420                 cmd_isme(&cmdbuf[5]);
1421         }
1422
1423         else if (!strncasecmp(cmdbuf, "RENU", 4)) {
1424                 cmd_renu(&cmdbuf[5]);
1425         }
1426
1427         else if (!DLoader_Exec_Cmd(cmdbuf)) {
1428                 cprintf("%d Unrecognized or unsupported command.\n", ERROR + CMD_NOT_SUPPORTED);
1429         }
1430
1431         unbuffer_output();
1432
1433         /* Run any after-each-command routines registered by modules */
1434         PerformSessionHooks(EVT_CMD);
1435         CtdlThreadName(old_name);
1436 }
1437
1438
1439 /*
1440  * This loop performs all asynchronous functions.
1441  */
1442 void do_async_loop(void) {
1443         PerformSessionHooks(EVT_ASYNC);
1444 }