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