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 #include <ctype.h>
  30 #include <string.h>
  31 #include <dirent.h>
  32 #include <errno.h>
  33 #include <limits.h>
  34 #include <netdb.h>
  35 #include <sys/types.h>
  36 #include <sys/socket.h>
  37 #include <netinet/in.h>
  38 #include <arpa/inet.h>
  39 #include "citadel.h"
  40 #include "server.h"
  41 #include "sysdep_decls.h"
  42 #include "citserver.h"
  43 #include "config.h"
  44 #include "database.h"
  45 #include "housekeeping.h"
  46 #include "user_ops.h"
  47 #include "msgbase.h"
  48 #include "support.h"
  49 #include "locate_host.h"
  50 #include "room_ops.h"
  51 #include "file_ops.h"
  52 #include "policy.h"
  53 #include "control.h"
  54 #include "tools.h"
  55 #include "euidindex.h"
  56 #include "serv_network.h"
  57
  58 #ifndef HAVE_SNPRINTF
  59 #include "snprintf.h"
  60 #endif
  61
  62 struct CitContext *ContextList = NULL;
  63 struct CitContext* next_session = NULL;
  64 char *unique_session_numbers;
  65 int ScheduledShutdown = 0;
  66 int do_defrag = 0;
  67 time_t server_startup_time;
  68
  69 /*
  70  * Various things that need to be initialized at startup
  71  */
  72 void master_startup(void) {
  73         struct timeval tv;
  74         unsigned int seed;
  75         FILE *urandom;
  76         struct ctdlroom qrbuf;
  77
  78         lprintf(CTDL_DEBUG, "master_startup() started\n");
  79         time(&server_startup_time);
  80
  81         lprintf(CTDL_INFO, "Opening databases\n");
  82         open_databases();
  83
  84         if (do_defrag) {
  85                 defrag_databases();
  86         }
  87
  88         check_ref_counts();
  89
  90         lprintf(CTDL_INFO, "Creating base rooms (if necessary)\n");
  91         create_room(config.c_baseroom,  0, "", 0, 1, 0, VIEW_BBS);
  92         create_room(AIDEROOM,           3, "", 0, 1, 0, VIEW_BBS);
  93         create_room(SYSCONFIGROOM,      3, "", 0, 1, 0, VIEW_BBS);
  94         create_room(config.c_twitroom,  0, "", 0, 1, 0, VIEW_BBS);
  95
  96         /* The "Local System Configuration" room doesn't need to be visible */
  97         if (lgetroom(&qrbuf, SYSCONFIGROOM) == 0) {
  98                 qrbuf.QRflags2 |= QR2_SYSTEM;
  99                 lputroom(&qrbuf);
 100         }
 101
 102         lprintf(CTDL_INFO, "Seeding the pseudo-random number generator...\n");
 103         urandom = fopen("/dev/urandom", "r");
 104         if (urandom != NULL) {
 105                 fread(&seed, sizeof seed, 1, urandom);
 106                 fclose(urandom);
 107         }
 108         else {
 109                 gettimeofday(&tv, NULL);
 110                 seed = tv.tv_usec;
 111         }
 112         srandom(seed);
 113
 114         lprintf(CTDL_INFO, "Initializing ipgm secret\n");
 115         get_config();
 116         config.c_ipgm_secret = rand();
 117         put_config();
 118
 119         lprintf(CTDL_DEBUG, "master_startup() finished\n");
 120 }
 121
 122
 123 /*
 124  * Cleanup routine to be called when the server is shutting down.
 125  */
 126 void master_cleanup(int exitcode) {
 127         struct CleanupFunctionHook *fcn;
 128         static int already_cleaning_up = 0;
 129
 130         if (already_cleaning_up) while(1) sleep(1);
 131         already_cleaning_up = 1;
 132
 133         /* Run any cleanup routines registered by loadable modules */
 134         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
 135                 (*fcn->h_function_pointer)();
 136         }
 137
 138         /* Close the AdjRefCount queue file */
 139         AdjRefCount(-1, 0);
 140
 141         /* Shut down the indexer thread */
 142         lprintf(CTDL_INFO, "Waiting for the indexer thread to shut down\n");
 143         pthread_join(indexer_thread_tid, NULL);
 144
 145         /* Shut down the checkpoint thread */
 146         lprintf(CTDL_INFO, "Waiting for the checkpoint thread to shut down\n");
 147         pthread_join(checkpoint_thread_tid, NULL);
 148
 149         /* Close databases */
 150         lprintf(CTDL_INFO, "Closing databases\n");
 151         close_databases();
 152
 153         /* flush the networker stuff */
 154         destroy_network_queue_room();
 155
 156         /* Do system-dependent stuff */
 157         sysdep_master_cleanup();
 158
 159 #ifdef DEBUG_MEMORY_LEAKS
 160         dump_heap();
 161 #endif
 162
 163         /* If the operator requested a halt but not an exit, halt here. */
 164         if (shutdown_and_halt) {
 165                 lprintf(CTDL_NOTICE, "citserver: Halting server without exiting.\n");
 166                 fflush(stdout); fflush(stderr);
 167                 while(1) {
 168                         sleep(32767);
 169                 }
 170         }
 171
 172         release_control();
 173
 174         /* Now go away. */
 175         lprintf(CTDL_NOTICE, "citserver: Exiting with status %d\n", exitcode);
 176         fflush(stdout); fflush(stderr);
 177
 178         if (restart_server != 0)
 179                 exit(1);
 180         exit(exitcode);
 181 }
 182
 183
 184
 185 /*
 186  * Terminate a session.
 187  */
 188 void RemoveContext (struct CitContext *con)
 189 {
 190         if (con==NULL) {
 191                 lprintf(CTDL_ERR,
 192                         "WARNING: RemoveContext() called with NULL!\n");
 193                 return;
 194         }
 195         lprintf(CTDL_DEBUG, "RemoveContext() session %d\n", con->cs_pid);
 196
 197         /* Run any cleanup routines registered by loadable modules.
 198          * Note: We have to "become_session()" because the cleanup functions
 199          *       might make references to "CC" assuming it's the right one.
 200          */
 201         become_session(con);
 202         PerformSessionHooks(EVT_STOP);
 203         become_session(NULL);
 204
 205         /* Now handle all of the administrivia. */
 206         lprintf(CTDL_DEBUG, "Calling logout(%d)\n", con->cs_pid);
 207         logout(con);
 208
 209         lprintf(CTDL_NOTICE, "[%3d] Session ended.\n", con->cs_pid);
 210
 211         /* If the client is still connected, blow 'em away. */
 212         lprintf(CTDL_DEBUG, "Closing socket %d\n", con->client_socket);
 213         close(con->client_socket);
 214
 215         lprintf(CTDL_DEBUG, "Done with RemoveContext()\n");
 216 }
 217
 218
 219
 220
 221
 222 /*
 223  * cmd_info()  -  tell the client about this server
 224  */
 225 void cmd_info(void) {
 226         cprintf("%d Server info:\n", LISTING_FOLLOWS);
 227         cprintf("%d\n", CC->cs_pid);
 228         cprintf("%s\n", config.c_nodename);
 229         cprintf("%s\n", config.c_humannode);
 230         cprintf("%s\n", config.c_fqdn);
 231         cprintf("%s\n", CITADEL);
 232         cprintf("%d\n", REV_LEVEL);
 233         cprintf("%s\n", config.c_site_location);
 234         cprintf("%s\n", config.c_sysadm);
 235         cprintf("%d\n", SERVER_TYPE);
 236         cprintf("%s\n", config.c_moreprompt);
 237         cprintf("1\n"); /* 1 = yes, this system supports floors */
 238         cprintf("1\n"); /* 1 = we support the extended paging options */
 239         cprintf("%s\n", CC->cs_nonce);
 240         cprintf("1\n"); /* 1 = yes, this system supports the QNOP command */
 241
 242 #ifdef HAVE_LDAP
 243         cprintf("1\n"); /* 1 = yes, this server is LDAP-enabled */
 244 #else
 245         cprintf("0\n"); /* 1 = no, this server is not LDAP-enabled */
 246 #endif
 247
 248         if (config.c_auth_mode == 1) {
 249                 cprintf("1\n"); /* "create new user" never works with host auth */
 250         }
 251         else {
 252                 cprintf("%d\n", config.c_disable_newu); /* otherwise, site defined */
 253         }
 254
 255         cprintf("%s\n", config.c_default_cal_zone);
 256
 257         cprintf("000\n");
 258 }
 259
 260
 261 /*
 262  * returns an asterisk if there are any instant messages waiting,
 263  * space otherwise.
 264  */
 265 char CtdlCheckExpress(void) {
 266         if (CC->FirstExpressMessage == NULL) {
 267                 return(' ');
 268         }
 269         else {
 270                 return('*');
 271         }
 272 }
 273
 274 void cmd_time(void)
 275 {
 276    time_t tv;
 277    struct tm tmp;
 278
 279    tv = time(NULL);
 280    localtime_r(&tv, &tmp);
 281
 282    /* timezone and daylight global variables are not portable. */
 283 #ifdef HAVE_STRUCT_TM_TM_GMTOFF
 284    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, tmp.tm_gmtoff, tmp.tm_isdst);
 285 #else
 286    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, timezone, tmp.tm_isdst);
 287 #endif
 288 }
 289
 290
 291 /*
 292  * Check originating host against the public_clients file.  This determines
 293  * whether the client is allowed to change the hostname for this session
 294  * (for example, to show the location of the user rather than the location
 295  * of the client).
 296  */
 297 int is_public_client(void)
 298 {
 299         char buf[1024];
 300         char addrbuf[1024];
 301         FILE *fp;
 302         int i;
 303         struct stat statbuf;
 304         static time_t pc_timestamp = 0;
 305         static char public_clients[SIZ];
 306         static char public_clients_file[SIZ];
 307
 308         snprintf(public_clients_file,
 309                          sizeof public_clients_file,
 310                          "%s/public_clients",
 311                          ctdl_etc_dir);
 312
 313         /*
 314          * Check the time stamp on the public_clients file.  If it's been
 315          * updated since the last time we were here (or if this is the first
 316          * time we've been through the loop), read its contents and learn
 317          * the IP addresses of the listed hosts.
 318          */
 319         if (stat(public_clients_file, &statbuf) != 0) {
 320                 /* No public_clients file exists, so bail out */
 321                 lprintf(CTDL_WARNING, "Warning: '%s' does not exist\n",
 322                                 public_clients_file);
 323                 return(0);
 324         }
 325
 326         if (statbuf.st_mtime > pc_timestamp) {
 327                 begin_critical_section(S_PUBLIC_CLIENTS);
 328                 lprintf(CTDL_INFO, "Loading %s\n", public_clients_file);
 329
 330                 safestrncpy(public_clients, "127.0.0.1", sizeof public_clients);
 331                 if (hostname_to_dotted_quad(addrbuf, config.c_fqdn) == 0) {
 332                         strcat(public_clients, "|");
 333                         strcat(public_clients, addrbuf);
 334                 }
 335
 336                 fp = fopen(public_clients_file, "r");
 337                 if (fp != NULL) while (fgets(buf, sizeof buf, fp)!=NULL) {
 338                         for (i=0; i<strlen(buf); ++i) {
 339                                 if (buf[i] == '#') buf[i] = 0;
 340                         }
 341                         while (isspace((buf[strlen(buf)-1]))) {
 342                                 buf[strlen(buf)-1] = 0;
 343                         }
 344                         if (hostname_to_dotted_quad(addrbuf, buf) == 0) {
 345                                 if ((strlen(public_clients) +
 346                                    strlen(addrbuf) + 2)
 347                                    < sizeof(public_clients)) {
 348                                         strcat(public_clients, "|");
 349                                         strcat(public_clients, addrbuf);
 350                                 }
 351                         }
 352                 }
 353                 fclose(fp);
 354                 pc_timestamp = time(NULL);
 355                 end_critical_section(S_PUBLIC_CLIENTS);
 356         }
 357
 358         lprintf(CTDL_DEBUG, "Checking whether %s is a local or public client\n",
 359                 CC->cs_addr);
 360         for (i=0; i<num_parms(public_clients); ++i) {
 361                 extract_token(addrbuf, public_clients, i, '|', sizeof addrbuf);
 362                 if (!strcasecmp(CC->cs_addr, addrbuf)) {
 363                         lprintf(CTDL_DEBUG, "... yes it is.\n");
 364                         return(1);
 365                 }
 366         }
 367
 368         /* No hits.  This is not a public client. */
 369         lprintf(CTDL_DEBUG, "... no it isn't.\n");
 370         return(0);
 371 }
 372
 373
 374 /*
 375  * the client is identifying itself to the server
 376  */
 377 void cmd_iden(char *argbuf)
 378 {
 379         int dev_code;
 380         int cli_code;
 381         int rev_level;
 382         char desc[128];
 383         char from_host[128];
 384         struct in_addr addr;
 385         int do_lookup = 0;
 386
 387         if (num_parms(argbuf)<4) {
 388                 cprintf("%d usage error\n", ERROR + ILLEGAL_VALUE);
 389                 return;
 390         }
 391
 392         dev_code = extract_int(argbuf,0);
 393         cli_code = extract_int(argbuf,1);
 394         rev_level = extract_int(argbuf,2);
 395         extract_token(desc, argbuf, 3, '|', sizeof desc);
 396
 397         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 398         from_host[sizeof from_host - 1] = 0;
 399         if (num_parms(argbuf)>=5) extract_token(from_host, argbuf, 4, '|', sizeof from_host);
 400
 401         CC->cs_clientdev = dev_code;
 402         CC->cs_clienttyp = cli_code;
 403         CC->cs_clientver = rev_level;
 404         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 405         CC->cs_clientname[31] = 0;
 406
 407         if (strlen(from_host) > 0) {
 408                 if (CC->is_local_socket) do_lookup = 1;
 409                 else if (is_public_client()) do_lookup = 1;
 410         }
 411
 412         if (do_lookup) {
 413                 lprintf(CTDL_DEBUG, "Looking up hostname '%s'\n", from_host);
 414                 if ((addr.s_addr = inet_addr(from_host)) != -1) {
 415                         locate_host(CC->cs_host, sizeof CC->cs_host,
 416                                 CC->cs_addr, sizeof CC->cs_addr,
 417                                 &addr);
 418                 }
 419                 else {
 420                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 421                         CC->cs_host[sizeof CC->cs_host - 1] = 0;
 422                 }
 423         }
 424
 425         lprintf(CTDL_NOTICE, "Client %d/%d/%01d.%02d (%s) from %s\n",
 426                 dev_code,
 427                 cli_code,
 428                 (rev_level / 100),
 429                 (rev_level % 100),
 430                 desc,
 431                 CC->cs_host);
 432         cprintf("%d Ok\n",CIT_OK);
 433 }
 434
 435
 436 /*
 437  * display system messages or help
 438  */
 439 void cmd_mesg(char *mname)
 440 {
 441         FILE *mfp;
 442         char targ[256];
 443         char buf[256];
 444         char buf2[256];
 445         char *dirs[2];
 446         DIR *dp;
 447         struct dirent *d;
 448
 449         extract_token(buf, mname, 0, '|', sizeof buf);
 450
 451         dirs[0] = strdup(ctdl_message_dir);
 452         dirs[1] = strdup(ctdl_hlp_dir);
 453
 454         snprintf(buf2, sizeof buf2, "%s.%d.%d",
 455                 buf, CC->cs_clientdev, CC->cs_clienttyp);
 456
 457         /* If the client requested "?" then produce a listing */
 458         if (!strcmp(buf, "?")) {
 459                 cprintf("%d %s\n", LISTING_FOLLOWS, buf);
 460                 dp = opendir(dirs[1]);
 461                 if (dp != NULL) {
 462                         while (d = readdir(dp), d != NULL) {
 463                                 if (d->d_name[0] != '.') {
 464                                         cprintf(" %s\n", d->d_name);
 465                                 }
 466                         }
 467                         closedir(dp);
 468                 }
 469                 cprintf("000\n");
 470                 free(dirs[0]);
 471                 free(dirs[1]);
 472                 return;
 473         }
 474
 475         /* Otherwise, look for the requested file by name. */
 476         else {
 477                 mesg_locate(targ, sizeof targ, buf2, 2, (const char **)dirs);
 478                 if (strlen(targ) == 0) {
 479                         snprintf(buf2, sizeof buf2, "%s.%d",
 480                                                         buf, CC->cs_clientdev);
 481                         mesg_locate(targ, sizeof targ, buf2, 2,
 482                                                         (const char **)dirs);
 483                         if (strlen(targ) == 0) {
 484                                 mesg_locate(targ, sizeof targ, buf, 2,
 485                                                         (const char **)dirs);
 486                         }
 487                 }
 488         }
 489
 490         free(dirs[0]);
 491         free(dirs[1]);
 492
 493         if (strlen(targ)==0) {
 494                 cprintf("%d '%s' not found.  (Searching in %s and %s)\n",
 495                         ERROR + FILE_NOT_FOUND,
 496                         mname,
 497                         ctdl_message_dir,
 498                         ctdl_hlp_dir
 499                 );
 500                 return;
 501         }
 502
 503         mfp = fopen(targ, "r");
 504         if (mfp==NULL) {
 505                 cprintf("%d Cannot open '%s': %s\n",
 506                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
 507                 return;
 508         }
 509         cprintf("%d %s\n", LISTING_FOLLOWS,buf);
 510
 511         while (fgets(buf, (sizeof buf - 1), mfp) != NULL) {
 512                 buf[strlen(buf)-1] = 0;
 513                 do_help_subst(buf);
 514                 cprintf("%s\n",buf);
 515         }
 516
 517         fclose(mfp);
 518         cprintf("000\n");
 519 }
 520
 521
 522 /*
 523  * enter system messages or help
 524  */
 525 void cmd_emsg(char *mname)
 526 {
 527         FILE *mfp;
 528         char targ[256];
 529         char buf[256];
 530         char *dirs[2];
 531         int a;
 532
 533         unbuffer_output();
 534
 535         if (CtdlAccessCheck(ac_aide)) return;
 536
 537         extract_token(buf, mname, 0, '|', sizeof buf);
 538         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 539                 if (buf[a] == '/') buf[a] = '.';
 540         }
 541
 542         dirs[0] = strdup(ctdl_message_dir);
 543         dirs[1] = strdup(ctdl_hlp_dir);
 544
 545         mesg_locate(targ, sizeof targ, buf, 2, (const char**)dirs);
 546         free(dirs[0]);
 547         free(dirs[1]);
 548
 549         if (strlen(targ)==0) {
 550                 snprintf(targ, sizeof targ,
 551                                  "%s/%s",
 552                                  ctdl_hlp_dir, buf);
 553         }
 554
 555         mfp = fopen(targ,"w");
 556         if (mfp==NULL) {
 557                 cprintf("%d Cannot open '%s': %s\n",
 558                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
 559                 return;
 560         }
 561         cprintf("%d %s\n", SEND_LISTING, targ);
 562
 563         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 564                 fprintf(mfp, "%s\n", buf);
 565         }
 566
 567         fclose(mfp);
 568 }
 569
 570
 571 /* Don't show the names of private rooms unless the viewing
 572  * user also knows the rooms.
 573  */
 574 void GenerateRoomDisplay(char *real_room,
 575                         struct CitContext *viewed,
 576                         struct CitContext *viewer) {
 577
 578         int ra;
 579
 580         strcpy(real_room, viewed->room.QRname);
 581         if (viewed->room.QRflags & QR_MAILBOX) {
 582                 strcpy(real_room, &real_room[11]);
 583         }
 584         if (viewed->room.QRflags & QR_PRIVATE) {
 585                 CtdlRoomAccess(&viewed->room, &viewer->user, &ra, NULL);
 586                 if ( (ra & UA_KNOWN) == 0) {
 587                         strcpy(real_room, "<private room>");
 588                 }
 589         }
 590
 591         if (viewed->cs_flags & CS_CHAT) {
 592                 while (strlen(real_room) < 14)
 593                         strcat(real_room, " ");
 594
 595                 strcpy(&real_room[14], "<chat>");
 596         }
 597
 598 }
 599
 600 /*
 601  * Convenience function.
 602  */
 603 int CtdlAccessCheck(int required_level) {
 604
 605         if (CC->internal_pgm) return(0);
 606         if (required_level >= ac_internal) {
 607                 cprintf("%d This is not a user-level command.\n",
 608                         ERROR + HIGHER_ACCESS_REQUIRED);
 609                 return(-1);
 610         }
 611
 612         if ((required_level >= ac_logged_in) && (CC->logged_in == 0)) {
 613                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 614                 return(-1);
 615         }
 616
 617         if (CC->user.axlevel >= 6) return(0);
 618         if (required_level >= ac_aide) {
 619                 cprintf("%d This command requires Aide access.\n",
 620                         ERROR + HIGHER_ACCESS_REQUIRED);
 621                 return(-1);
 622         }
 623
 624         if (is_room_aide()) return(0);
 625         if (required_level >= ac_room_aide) {
 626                 cprintf("%d This command requires Aide or Room Aide access.\n",
 627                         ERROR + HIGHER_ACCESS_REQUIRED);
 628                 return(-1);
 629         }
 630
 631         /* shhh ... succeed quietly */
 632         return(0);
 633 }
 634
 635
 636
 637 /*
 638  * Terminate another running session
 639  */
 640 void cmd_term(char *cmdbuf)
 641 {
 642         int session_num;
 643         struct CitContext *ccptr;
 644         int found_it = 0;
 645         int allowed = 0;
 646
 647         session_num = extract_int(cmdbuf, 0);
 648         if (session_num == CC->cs_pid) {
 649                 cprintf("%d You can't kill your own session.\n", ERROR + ILLEGAL_VALUE);
 650                 return;
 651         }
 652
 653         lprintf(CTDL_DEBUG, "Locating session to kill\n");
 654         begin_critical_section(S_SESSION_TABLE);
 655         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 656                 if (session_num == ccptr->cs_pid) {
 657                         found_it = 1;
 658                         if ((ccptr->user.usernum == CC->user.usernum)
 659                            || (CC->user.axlevel >= 6)) {
 660                                 allowed = 1;
 661                                 ccptr->kill_me = 1;
 662                         }
 663                         else {
 664                                 allowed = 0;
 665                         }
 666                 }
 667         }
 668         end_critical_section(S_SESSION_TABLE);
 669
 670         if (found_it) {
 671                 if (allowed) {
 672                         cprintf("%d Session terminated.\n", CIT_OK);
 673                 }
 674                 else {
 675                         cprintf("%d You are not allowed to do that.\n",
 676                                 ERROR + HIGHER_ACCESS_REQUIRED);
 677                 }
 678         }
 679         else {
 680                 cprintf("%d No such session.\n", ERROR + ILLEGAL_VALUE);
 681         }
 682 }
 683
 684
 685
 686
 687
 688 /*
 689  * get the paginator prompt
 690  */
 691 void cmd_more(void) {
 692         cprintf("%d %s\n", CIT_OK, config.c_moreprompt);
 693 }
 694
 695 /*
 696  * echo
 697  */
 698 void cmd_echo(char *etext)
 699 {
 700         cprintf("%d %s\n", CIT_OK, etext);
 701 }
 702
 703
 704
 705 /*
 706  * identify as internal program
 707  */
 708 void cmd_ipgm(char *argbuf)
 709 {
 710         int secret;
 711
 712         secret = extract_int(argbuf, 0);
 713
 714         /* For security reasons, we do NOT allow this command to run
 715          * over the network.  Local sockets only.
 716          */
 717         if (!CC->is_local_socket) {
 718                 sleep(5);
 719                 cprintf("%d Authentication failed.\n",
 720                         ERROR + PASSWORD_REQUIRED);
 721         }
 722         else if (secret == config.c_ipgm_secret) {
 723                 CC->internal_pgm = 1;
 724                 strcpy(CC->curr_user, "<internal program>");
 725                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 726                 cprintf("%d Authenticated as an internal program.\n", CIT_OK);
 727         }
 728         else {
 729                 sleep(5);
 730                 cprintf("%d Authentication failed.\n",
 731                         ERROR + PASSWORD_REQUIRED);
 732                 lprintf(CTDL_ERR, "Warning: ipgm authentication failed.\n");
 733                 CC->kill_me = 1;
 734         }
 735
 736         /* Now change the ipgm secret for the next round.
 737          * (Disabled because it breaks concurrent scripts.  The fact that
 738          * we no longer accept IPGM over the network should be sufficient
 739          * to prevent brute-force attacks.  If you don't agree, uncomment
 740          * this block.)
 741         get_config();
 742         config.c_ipgm_secret = rand();
 743         put_config();
 744         */
 745 }
 746
 747
 748 /*
 749  * Shut down the server
 750  */
 751 void cmd_down(char *argbuf) {
 752         char *Reply ="%d Shutting down server.  Goodbye.\n";
 753
 754         if (CtdlAccessCheck(ac_aide)) return;
 755
 756         if (!IsEmptyStr(argbuf))
 757         {
 758                 int state = CIT_OK;
 759                 restart_server = extract_int(argbuf, 0);
 760
 761                 if (restart_server > 0)
 762                         Reply = "%d Restarting server.  See you soon.\n";
 763                 if ((restart_server > 0) && !running_as_daemon)
 764                 {
 765                         lprintf(CTDL_ERR, "The user requested restart, but not running as deamon! Geronimooooooo!\n");
 766                         Reply = "%d Warning, not running in deamon mode. maybe we will come up again, but don't lean on it.\n";
 767                         state = ERROR;
 768                 }
 769                 cprintf(Reply, state);
 770         }
 771         else
 772         {
 773                 cprintf(Reply, CIT_OK);
 774         }
 775         time_to_die = 1;
 776 }
 777
 778 /*
 779  * Halt the server without exiting the server process.
 780  */
 781 void cmd_halt(void) {
 782
 783         if (CtdlAccessCheck(ac_aide)) return;
 784
 785         cprintf("%d Halting server.  Goodbye.\n", CIT_OK);
 786         time_to_die = 1;
 787         shutdown_and_halt = 1;
 788 }
 789
 790 /*
 791  * Schedule or cancel a server shutdown
 792  */
 793 void cmd_scdn(char *argbuf)
 794 {
 795         int new_state;
 796         int state = CIT_OK;
 797         char *Reply = "%d %d\n";
 798
 799         if (CtdlAccessCheck(ac_aide)) return;
 800
 801         new_state = extract_int(argbuf, 0);
 802         if ((new_state == 2) || (new_state == 3))
 803         {
 804                 restart_server = 1;
 805                 if (!running_as_daemon)
 806                 {
 807                         lprintf(CTDL_ERR, "The user requested restart, but not running as deamon! Geronimooooooo!\n");
 808                         Reply = "%d %d Warning, not running in deamon mode. maybe we will come up again, but don't lean on it.\n";
 809                         state = ERROR;
 810                 }
 811
 812                 restart_server = extract_int(argbuf, 0);
 813                 new_state -= 2;
 814         }
 815         if ((new_state == 0) || (new_state == 1)) {
 816                 ScheduledShutdown = new_state;
 817         }
 818         cprintf(Reply, state, ScheduledShutdown);
 819 }
 820
 821
 822 /*
 823  * Set or unset asynchronous protocol mode
 824  */
 825 void cmd_asyn(char *argbuf)
 826 {
 827         int new_state;
 828
 829         new_state = extract_int(argbuf, 0);
 830         if ((new_state == 0) || (new_state == 1)) {
 831                 CC->is_async = new_state;
 832         }
 833         cprintf("%d %d\n", CIT_OK, CC->is_async);
 834 }
 835
 836
 837 /*
 838  * Generate a "nonce" for APOP-style authentication.
 839  *
 840  * RFC 1725 et al specify a PID to be placed in front of the nonce.
 841  * Quoth BTX: That would be stupid.
 842  */
 843 void generate_nonce(struct CitContext *con) {
 844         struct timeval tv;
 845
 846         memset(con->cs_nonce, NONCE_SIZE, 0);
 847         gettimeofday(&tv, NULL);
 848         memset(con->cs_nonce, NONCE_SIZE, 0);
 849         snprintf(con->cs_nonce, NONCE_SIZE, "<%d%ld@%s>",
 850                 rand(), (long)tv.tv_usec, config.c_fqdn);
 851 }
 852
 853
 854
 855
 856 /*
 857  * Back-end function for starting a session
 858  */
 859 void begin_session(struct CitContext *con)
 860 {
 861         socklen_t len;
 862         struct sockaddr_in sin;
 863
 864         /*
 865          * Initialize some variables specific to our context.
 866          */
 867         con->logged_in = 0;
 868         con->internal_pgm = 0;
 869         con->download_fp = NULL;
 870         con->upload_fp = NULL;
 871         con->FirstExpressMessage = NULL;
 872         time(&con->lastcmd);
 873         time(&con->lastidle);
 874         strcpy(con->lastcmdname, "    ");
 875         strcpy(con->cs_clientname, "(unknown)");
 876         strcpy(con->curr_user, NLI);
 877         strcpy(con->net_node, "");
 878         strcpy(con->fake_username, "");
 879         strcpy(con->fake_hostname, "");
 880         strcpy(con->fake_roomname, "");
 881         generate_nonce(con);
 882         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 883         safestrncpy(con->cs_addr, "", sizeof con->cs_addr);
 884         con->cs_host[sizeof con->cs_host - 1] = 0;
 885         len = sizeof sin;
 886         if (!CC->is_local_socket) {
 887                 if (!getpeername(con->client_socket, (struct sockaddr *) &sin, &len)) {
 888                         locate_host(con->cs_host, sizeof con->cs_host,
 889                                 con->cs_addr, sizeof con->cs_addr,
 890                                 &sin.sin_addr
 891                         );
 892                 }
 893         }
 894         else {
 895                 strcpy(con->cs_host, "");
 896         }
 897         con->cs_flags = 0;
 898         con->upload_type = UPL_FILE;
 899         con->dl_is_net = 0;
 900
 901         con->nologin = 0;
 902         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions)) {
 903                 con->nologin = 1;
 904         }
 905
 906         lprintf(CTDL_NOTICE, "Session started.\n");
 907
 908         /* Run any session startup routines registered by loadable modules */
 909         PerformSessionHooks(EVT_START);
 910 }
 911
 912
 913 void citproto_begin_session() {
 914         if (CC->nologin==1) {
 915                 cprintf("%d %s: Too many users are already online (maximum is %d)\n",
 916                         ERROR + MAX_SESSIONS_EXCEEDED,
 917                         config.c_nodename, config.c_maxsessions
 918                 );
 919                 CC->kill_me = 1;
 920         }
 921         else {
 922                 cprintf("%d %s Citadel server ready.\n",
 923                         CIT_OK, config.c_nodename);
 924         }
 925 }
 926
 927
 928
 929
 930 /*
 931  * This loop recognizes all server commands.
 932  */
 933 void do_command_loop(void) {
 934         char cmdbuf[SIZ];
 935
 936         time(&CC->lastcmd);
 937         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 938         if (client_getln(cmdbuf, sizeof cmdbuf) < 1) {
 939                 lprintf(CTDL_ERR, "Client disconnected: ending session.\n");
 940                 CC->kill_me = 1;
 941                 return;
 942         }
 943
 944         /* Log the server command, but don't show passwords... */
 945         if ( (strncasecmp(cmdbuf, "PASS", 4))
 946            && (strncasecmp(cmdbuf, "SETP", 4)) ) {
 947                 lprintf(CTDL_INFO, "%s\n", cmdbuf);
 948         }
 949         else {
 950                 lprintf(CTDL_INFO, "<password command sent>\n");
 951         }
 952
 953         buffer_output();
 954
 955         /*
 956          * Let other clients see the last command we executed, and
 957          * update the idle time, but not NOOP, QNOP, PEXP, GEXP, RWHO, or TIME.
 958          */
 959         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 960            && (strncasecmp(cmdbuf, "QNOP", 4))
 961            && (strncasecmp(cmdbuf, "PEXP", 4))
 962            && (strncasecmp(cmdbuf, "GEXP", 4))
 963            && (strncasecmp(cmdbuf, "RWHO", 4))
 964            && (strncasecmp(cmdbuf, "TIME", 4)) ) {
 965                 strcpy(CC->lastcmdname, "    ");
 966                 safestrncpy(CC->lastcmdname, cmdbuf, sizeof(CC->lastcmdname));
 967                 time(&CC->lastidle);
 968         }
 969
 970         if ((strncasecmp(cmdbuf, "ENT0", 4))
 971            && (strncasecmp(cmdbuf, "MESG", 4))
 972            && (strncasecmp(cmdbuf, "MSGS", 4)))
 973         {
 974            CC->cs_flags &= ~CS_POSTING;
 975         }
 976
 977         if (!strncasecmp(cmdbuf, "NOOP", 4)) {
 978                 cprintf("%d%cok\n", CIT_OK, CtdlCheckExpress() );
 979         }
 980
 981         else if (!strncasecmp(cmdbuf, "QNOP", 4)) {
 982                 /* do nothing, this command returns no response */
 983         }
 984
 985         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 986                 cprintf("%d Goodbye.\n", CIT_OK);
 987                 CC->kill_me = 1;
 988         }
 989
 990         else if (!strncasecmp(cmdbuf,"ASYN",4)) {
 991                 cmd_asyn(&cmdbuf[5]);
 992         }
 993
 994         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 995                 if (CC->logged_in) logout(CC);
 996                 cprintf("%d logged out.\n", CIT_OK);
 997         }
 998
 999         else if (!strncasecmp(cmdbuf,"USER",4)) {
1000                 cmd_user(&cmdbuf[5]);
1001         }
1002
1003         else if (!strncasecmp(cmdbuf,"PASS",4)) {
1004                 cmd_pass(&cmdbuf[5]);
1005         }
1006
1007         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
1008                 cmd_newu(&cmdbuf[5]);
1009         }
1010
1011         else if (!strncasecmp(cmdbuf,"CREU",4)) {
1012                 cmd_creu(&cmdbuf[5]);
1013         }
1014
1015         else if (!strncasecmp(cmdbuf,"SETP",4)) {
1016                 cmd_setp(&cmdbuf[5]);
1017         }
1018
1019         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
1020                 cmd_lrms(&cmdbuf[5]);
1021         }
1022
1023         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
1024                 cmd_lkra(&cmdbuf[5]);
1025         }
1026
1027         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
1028                 cmd_lkrn(&cmdbuf[5]);
1029         }
1030
1031         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
1032                 cmd_lkro(&cmdbuf[5]);
1033         }
1034
1035         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
1036                 cmd_lzrm(&cmdbuf[5]);
1037         }
1038
1039         else if (!strncasecmp(cmdbuf,"LPRM",4)) {
1040                 cmd_lprm(&cmdbuf[5]);
1041         }
1042
1043         else if (!strncasecmp(cmdbuf,"GETU",4)) {
1044                 cmd_getu();
1045         }
1046
1047         else if (!strncasecmp(cmdbuf,"SETU",4)) {
1048                 cmd_setu(&cmdbuf[5]);
1049         }
1050
1051         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
1052                 cmd_goto(&cmdbuf[5]);
1053         }
1054
1055         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
1056                 cmd_msgs(&cmdbuf[5]);
1057         }
1058
1059         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
1060                 cmd_whok();
1061         }
1062
1063         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
1064                 cmd_rdir();
1065         }
1066
1067         else if (!strncasecmp(cmdbuf,"EUID",4)) {
1068                 cmd_euid(&cmdbuf[5]);
1069         }
1070
1071         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
1072                 cmd_msg0(&cmdbuf[5]);
1073         }
1074
1075         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
1076                 cmd_msg2(&cmdbuf[5]);
1077         }
1078
1079         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
1080                 cmd_msg3(&cmdbuf[5]);
1081         }
1082
1083         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
1084                 cmd_msg4(&cmdbuf[5]);
1085         }
1086
1087         else if (!strncasecmp(cmdbuf,"MSGP",4)) {
1088                 cmd_msgp(&cmdbuf[5]);
1089         }
1090
1091         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
1092                 cmd_opna(&cmdbuf[5]);
1093         }
1094
1095         else if (!strncasecmp(cmdbuf,"DLAT",4)) {
1096                 cmd_dlat(&cmdbuf[5]);
1097         }
1098
1099         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1100                 cmd_info();
1101         }
1102
1103         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1104                 cmd_slrp(&cmdbuf[5]);
1105         }
1106
1107         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1108                 cmd_invt_kick(&cmdbuf[5],1);
1109         }
1110
1111         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1112                 cmd_invt_kick(&cmdbuf[5],0);
1113         }
1114
1115         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1116                 cmd_getr();
1117         }
1118
1119         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1120                 cmd_setr(&cmdbuf[5]);
1121         }
1122
1123         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1124                 cmd_geta();
1125         }
1126
1127         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1128                 cmd_seta(&cmdbuf[5]);
1129         }
1130
1131         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1132                 cmd_ent0(&cmdbuf[5]);
1133         }
1134
1135         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1136                 cmd_rinf();
1137         }
1138
1139         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1140                 cmd_dele(&cmdbuf[5]);
1141         }
1142
1143         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1144                 cmd_kill(&cmdbuf[5]);
1145         }
1146
1147         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1148                 cmd_cre8(&cmdbuf[5]);
1149         }
1150
1151         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1152                 cmd_move(&cmdbuf[5]);
1153         }
1154
1155         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1156                 cmd_forg();
1157         }
1158
1159         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1160                 cmd_mesg(&cmdbuf[5]);
1161         }
1162
1163         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1164                 cmd_emsg(&cmdbuf[5]);
1165         }
1166
1167         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1168                 cmd_gnur();
1169         }
1170
1171         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1172                 cmd_vali(&cmdbuf[5]);
1173         }
1174
1175         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1176                 cmd_einf(&cmdbuf[5]);
1177         }
1178
1179         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1180                 cmd_list(&cmdbuf[5]);
1181         }
1182
1183         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1184                 cmd_chek();
1185         }
1186
1187         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1188                 cmd_delf(&cmdbuf[5]);
1189         }
1190
1191         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1192                 cmd_movf(&cmdbuf[5]);
1193         }
1194
1195         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1196                 cmd_netf(&cmdbuf[5]);
1197         }
1198
1199         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1200                 cmd_open(&cmdbuf[5]);
1201         }
1202
1203         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1204                 cmd_clos();
1205         }
1206
1207         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1208                 cmd_uopn(&cmdbuf[5]);
1209         }
1210
1211         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1212                 cmd_ucls(&cmdbuf[5]);
1213         }
1214
1215         else if (!strncasecmp(cmdbuf,"READ",4)) {
1216                 cmd_read(&cmdbuf[5]);
1217         }
1218
1219         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1220                 cmd_writ(&cmdbuf[5]);
1221         }
1222
1223         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1224                 cmd_qusr(&cmdbuf[5]);
1225         }
1226
1227         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1228                 cmd_echo(&cmdbuf[5]);
1229         }
1230
1231         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1232                 cmd_oimg(&cmdbuf[5]);
1233         }
1234
1235         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1236                 cmd_more();
1237         }
1238
1239         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1240                 cmd_ndop(&cmdbuf[5]);
1241         }
1242
1243         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1244                 cmd_nuop(&cmdbuf[5]);
1245         }
1246
1247         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1248                 cmd_lflr();
1249         }
1250
1251         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1252                 cmd_cflr(&cmdbuf[5]);
1253         }
1254
1255         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1256                 cmd_kflr(&cmdbuf[5]);
1257         }
1258
1259         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1260                 cmd_eflr(&cmdbuf[5]);
1261         }
1262
1263         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1264                 cmd_iden(&cmdbuf[5]);
1265         }
1266
1267         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1268                 cmd_ipgm(&cmdbuf[5]);
1269         }
1270
1271         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1272                 cmd_term(&cmdbuf[5]);
1273         }
1274
1275         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1276                 cmd_down(&cmdbuf[5]);
1277         }
1278
1279         else if (!strncasecmp(cmdbuf,"HALT",4)) {
1280                 cmd_halt();
1281         }
1282
1283         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1284                 cmd_scdn(&cmdbuf[5]);
1285         }
1286
1287         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1288                 cmd_uimg(&cmdbuf[5]);
1289         }
1290
1291         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1292                 cmd_time();
1293         }
1294
1295         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1296                 cmd_agup(&cmdbuf[5]);
1297         }
1298
1299         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1300                 cmd_asup(&cmdbuf[5]);
1301         }
1302
1303         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1304                 cmd_gpex(&cmdbuf[5]);
1305         }
1306
1307         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1308                 cmd_spex(&cmdbuf[5]);
1309         }
1310
1311         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1312                 cmd_conf(&cmdbuf[5]);
1313         }
1314
1315         else if (!strncasecmp(cmdbuf, "SEEN", 4)) {
1316                 cmd_seen(&cmdbuf[5]);
1317         }
1318
1319         else if (!strncasecmp(cmdbuf, "GTSN", 4)) {
1320                 cmd_gtsn(&cmdbuf[5]);
1321         }
1322
1323         else if (!strncasecmp(cmdbuf, "VIEW", 4)) {
1324                 cmd_view(&cmdbuf[5]);
1325         }
1326
1327         else if (!strncasecmp(cmdbuf, "ISME", 4)) {
1328                 cmd_isme(&cmdbuf[5]);
1329         }
1330
1331         else if (!DLoader_Exec_Cmd(cmdbuf)) {
1332                 cprintf("%d Unrecognized or unsupported command.\n",
1333                         ERROR + CMD_NOT_SUPPORTED);
1334                }
1335
1336         unbuffer_output();
1337
1338         /* Run any after-each-command routines registered by modules */
1339         PerformSessionHooks(EVT_CMD);
1340 }
1341
1342
1343 /*
1344  * This loop performs all asynchronous functions.
1345  */
1346 void do_async_loop(void) {
1347         PerformSessionHooks(EVT_ASYNC);
1348 }