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
 797         if (CtdlAccessCheck(ac_aide)) return;
 798
 799         new_state = extract_int(argbuf, 0);
 800         if ((new_state == 0) || (new_state == 1)) {
 801                 ScheduledShutdown = new_state;
 802         }
 803         cprintf("%d %d\n", CIT_OK, ScheduledShutdown);
 804 }
 805
 806
 807 /*
 808  * Set or unset asynchronous protocol mode
 809  */
 810 void cmd_asyn(char *argbuf)
 811 {
 812         int new_state;
 813
 814         new_state = extract_int(argbuf, 0);
 815         if ((new_state == 0) || (new_state == 1)) {
 816                 CC->is_async = new_state;
 817         }
 818         cprintf("%d %d\n", CIT_OK, CC->is_async);
 819 }
 820
 821
 822 /*
 823  * Generate a "nonce" for APOP-style authentication.
 824  *
 825  * RFC 1725 et al specify a PID to be placed in front of the nonce.
 826  * Quoth BTX: That would be stupid.
 827  */
 828 void generate_nonce(struct CitContext *con) {
 829         struct timeval tv;
 830
 831         memset(con->cs_nonce, NONCE_SIZE, 0);
 832         gettimeofday(&tv, NULL);
 833         memset(con->cs_nonce, NONCE_SIZE, 0);
 834         snprintf(con->cs_nonce, NONCE_SIZE, "<%d%ld@%s>",
 835                 rand(), (long)tv.tv_usec, config.c_fqdn);
 836 }
 837
 838
 839
 840
 841 /*
 842  * Back-end function for starting a session
 843  */
 844 void begin_session(struct CitContext *con)
 845 {
 846         socklen_t len;
 847         struct sockaddr_in sin;
 848
 849         /*
 850          * Initialize some variables specific to our context.
 851          */
 852         con->logged_in = 0;
 853         con->internal_pgm = 0;
 854         con->download_fp = NULL;
 855         con->upload_fp = NULL;
 856         con->FirstExpressMessage = NULL;
 857         time(&con->lastcmd);
 858         time(&con->lastidle);
 859         strcpy(con->lastcmdname, "    ");
 860         strcpy(con->cs_clientname, "(unknown)");
 861         strcpy(con->curr_user, NLI);
 862         strcpy(con->net_node, "");
 863         strcpy(con->fake_username, "");
 864         strcpy(con->fake_hostname, "");
 865         strcpy(con->fake_roomname, "");
 866         generate_nonce(con);
 867         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 868         safestrncpy(con->cs_addr, "", sizeof con->cs_addr);
 869         con->cs_host[sizeof con->cs_host - 1] = 0;
 870         len = sizeof sin;
 871         if (!CC->is_local_socket) {
 872                 if (!getpeername(con->client_socket, (struct sockaddr *) &sin, &len)) {
 873                         locate_host(con->cs_host, sizeof con->cs_host,
 874                                 con->cs_addr, sizeof con->cs_addr,
 875                                 &sin.sin_addr
 876                         );
 877                 }
 878         }
 879         else {
 880                 strcpy(con->cs_host, "");
 881         }
 882         con->cs_flags = 0;
 883         con->upload_type = UPL_FILE;
 884         con->dl_is_net = 0;
 885
 886         con->nologin = 0;
 887         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions)) {
 888                 con->nologin = 1;
 889         }
 890
 891         lprintf(CTDL_NOTICE, "Session started.\n");
 892
 893         /* Run any session startup routines registered by loadable modules */
 894         PerformSessionHooks(EVT_START);
 895 }
 896
 897
 898 void citproto_begin_session() {
 899         if (CC->nologin==1) {
 900                 cprintf("%d %s: Too many users are already online (maximum is %d)\n",
 901                         ERROR + MAX_SESSIONS_EXCEEDED,
 902                         config.c_nodename, config.c_maxsessions
 903                 );
 904                 CC->kill_me = 1;
 905         }
 906         else {
 907                 cprintf("%d %s Citadel server ready.\n",
 908                         CIT_OK, config.c_nodename);
 909         }
 910 }
 911
 912
 913
 914
 915 /*
 916  * This loop recognizes all server commands.
 917  */
 918 void do_command_loop(void) {
 919         char cmdbuf[SIZ];
 920
 921         time(&CC->lastcmd);
 922         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 923         if (client_getln(cmdbuf, sizeof cmdbuf) < 1) {
 924                 lprintf(CTDL_ERR, "Client disconnected: ending session.\n");
 925                 CC->kill_me = 1;
 926                 return;
 927         }
 928
 929         /* Log the server command, but don't show passwords... */
 930         if ( (strncasecmp(cmdbuf, "PASS", 4))
 931            && (strncasecmp(cmdbuf, "SETP", 4)) ) {
 932                 lprintf(CTDL_INFO, "%s\n", cmdbuf);
 933         }
 934         else {
 935                 lprintf(CTDL_INFO, "<password command sent>\n");
 936         }
 937
 938         buffer_output();
 939
 940         /*
 941          * Let other clients see the last command we executed, and
 942          * update the idle time, but not NOOP, QNOP, PEXP, GEXP, RWHO, or TIME.
 943          */
 944         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 945            && (strncasecmp(cmdbuf, "QNOP", 4))
 946            && (strncasecmp(cmdbuf, "PEXP", 4))
 947            && (strncasecmp(cmdbuf, "GEXP", 4))
 948            && (strncasecmp(cmdbuf, "RWHO", 4))
 949            && (strncasecmp(cmdbuf, "TIME", 4)) ) {
 950                 strcpy(CC->lastcmdname, "    ");
 951                 safestrncpy(CC->lastcmdname, cmdbuf, sizeof(CC->lastcmdname));
 952                 time(&CC->lastidle);
 953         }
 954
 955         if ((strncasecmp(cmdbuf, "ENT0", 4))
 956            && (strncasecmp(cmdbuf, "MESG", 4))
 957            && (strncasecmp(cmdbuf, "MSGS", 4)))
 958         {
 959            CC->cs_flags &= ~CS_POSTING;
 960         }
 961
 962         if (!strncasecmp(cmdbuf, "NOOP", 4)) {
 963                 cprintf("%d%cok\n", CIT_OK, CtdlCheckExpress() );
 964         }
 965
 966         else if (!strncasecmp(cmdbuf, "QNOP", 4)) {
 967                 /* do nothing, this command returns no response */
 968         }
 969
 970         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 971                 cprintf("%d Goodbye.\n", CIT_OK);
 972                 CC->kill_me = 1;
 973         }
 974
 975         else if (!strncasecmp(cmdbuf,"ASYN",4)) {
 976                 cmd_asyn(&cmdbuf[5]);
 977         }
 978
 979         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 980                 if (CC->logged_in) logout(CC);
 981                 cprintf("%d logged out.\n", CIT_OK);
 982         }
 983
 984         else if (!strncasecmp(cmdbuf,"USER",4)) {
 985                 cmd_user(&cmdbuf[5]);
 986         }
 987
 988         else if (!strncasecmp(cmdbuf,"PASS",4)) {
 989                 cmd_pass(&cmdbuf[5]);
 990         }
 991
 992         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 993                 cmd_newu(&cmdbuf[5]);
 994         }
 995
 996         else if (!strncasecmp(cmdbuf,"CREU",4)) {
 997                 cmd_creu(&cmdbuf[5]);
 998         }
 999
1000         else if (!strncasecmp(cmdbuf,"SETP",4)) {
1001                 cmd_setp(&cmdbuf[5]);
1002         }
1003
1004         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
1005                 cmd_lrms(&cmdbuf[5]);
1006         }
1007
1008         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
1009                 cmd_lkra(&cmdbuf[5]);
1010         }
1011
1012         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
1013                 cmd_lkrn(&cmdbuf[5]);
1014         }
1015
1016         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
1017                 cmd_lkro(&cmdbuf[5]);
1018         }
1019
1020         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
1021                 cmd_lzrm(&cmdbuf[5]);
1022         }
1023
1024         else if (!strncasecmp(cmdbuf,"LPRM",4)) {
1025                 cmd_lprm(&cmdbuf[5]);
1026         }
1027
1028         else if (!strncasecmp(cmdbuf,"GETU",4)) {
1029                 cmd_getu();
1030         }
1031
1032         else if (!strncasecmp(cmdbuf,"SETU",4)) {
1033                 cmd_setu(&cmdbuf[5]);
1034         }
1035
1036         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
1037                 cmd_goto(&cmdbuf[5]);
1038         }
1039
1040         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
1041                 cmd_msgs(&cmdbuf[5]);
1042         }
1043
1044         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
1045                 cmd_whok();
1046         }
1047
1048         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
1049                 cmd_rdir();
1050         }
1051
1052         else if (!strncasecmp(cmdbuf,"EUID",4)) {
1053                 cmd_euid(&cmdbuf[5]);
1054         }
1055
1056         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
1057                 cmd_msg0(&cmdbuf[5]);
1058         }
1059
1060         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
1061                 cmd_msg2(&cmdbuf[5]);
1062         }
1063
1064         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
1065                 cmd_msg3(&cmdbuf[5]);
1066         }
1067
1068         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
1069                 cmd_msg4(&cmdbuf[5]);
1070         }
1071
1072         else if (!strncasecmp(cmdbuf,"MSGP",4)) {
1073                 cmd_msgp(&cmdbuf[5]);
1074         }
1075
1076         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
1077                 cmd_opna(&cmdbuf[5]);
1078         }
1079
1080         else if (!strncasecmp(cmdbuf,"DLAT",4)) {
1081                 cmd_dlat(&cmdbuf[5]);
1082         }
1083
1084         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1085                 cmd_info();
1086         }
1087
1088         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1089                 cmd_slrp(&cmdbuf[5]);
1090         }
1091
1092         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1093                 cmd_invt_kick(&cmdbuf[5],1);
1094         }
1095
1096         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1097                 cmd_invt_kick(&cmdbuf[5],0);
1098         }
1099
1100         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1101                 cmd_getr();
1102         }
1103
1104         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1105                 cmd_setr(&cmdbuf[5]);
1106         }
1107
1108         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1109                 cmd_geta();
1110         }
1111
1112         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1113                 cmd_seta(&cmdbuf[5]);
1114         }
1115
1116         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1117                 cmd_ent0(&cmdbuf[5]);
1118         }
1119
1120         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1121                 cmd_rinf();
1122         }
1123
1124         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1125                 cmd_dele(&cmdbuf[5]);
1126         }
1127
1128         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1129                 cmd_kill(&cmdbuf[5]);
1130         }
1131
1132         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1133                 cmd_cre8(&cmdbuf[5]);
1134         }
1135
1136         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1137                 cmd_move(&cmdbuf[5]);
1138         }
1139
1140         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1141                 cmd_forg();
1142         }
1143
1144         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1145                 cmd_mesg(&cmdbuf[5]);
1146         }
1147
1148         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1149                 cmd_emsg(&cmdbuf[5]);
1150         }
1151
1152         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1153                 cmd_gnur();
1154         }
1155
1156         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1157                 cmd_vali(&cmdbuf[5]);
1158         }
1159
1160         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1161                 cmd_einf(&cmdbuf[5]);
1162         }
1163
1164         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1165                 cmd_list(&cmdbuf[5]);
1166         }
1167
1168         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1169                 cmd_chek();
1170         }
1171
1172         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1173                 cmd_delf(&cmdbuf[5]);
1174         }
1175
1176         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1177                 cmd_movf(&cmdbuf[5]);
1178         }
1179
1180         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1181                 cmd_netf(&cmdbuf[5]);
1182         }
1183
1184         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1185                 cmd_open(&cmdbuf[5]);
1186         }
1187
1188         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1189                 cmd_clos();
1190         }
1191
1192         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1193                 cmd_uopn(&cmdbuf[5]);
1194         }
1195
1196         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1197                 cmd_ucls(&cmdbuf[5]);
1198         }
1199
1200         else if (!strncasecmp(cmdbuf,"READ",4)) {
1201                 cmd_read(&cmdbuf[5]);
1202         }
1203
1204         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1205                 cmd_writ(&cmdbuf[5]);
1206         }
1207
1208         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1209                 cmd_qusr(&cmdbuf[5]);
1210         }
1211
1212         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1213                 cmd_echo(&cmdbuf[5]);
1214         }
1215
1216         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1217                 cmd_oimg(&cmdbuf[5]);
1218         }
1219
1220         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1221                 cmd_more();
1222         }
1223
1224         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1225                 cmd_ndop(&cmdbuf[5]);
1226         }
1227
1228         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1229                 cmd_nuop(&cmdbuf[5]);
1230         }
1231
1232         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1233                 cmd_lflr();
1234         }
1235
1236         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1237                 cmd_cflr(&cmdbuf[5]);
1238         }
1239
1240         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1241                 cmd_kflr(&cmdbuf[5]);
1242         }
1243
1244         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1245                 cmd_eflr(&cmdbuf[5]);
1246         }
1247
1248         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1249                 cmd_iden(&cmdbuf[5]);
1250         }
1251
1252         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1253                 cmd_ipgm(&cmdbuf[5]);
1254         }
1255
1256         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1257                 cmd_term(&cmdbuf[5]);
1258         }
1259
1260         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1261                 cmd_down(&cmdbuf[5]);
1262         }
1263
1264         else if (!strncasecmp(cmdbuf,"HALT",4)) {
1265                 cmd_halt();
1266         }
1267
1268         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1269                 cmd_scdn(&cmdbuf[5]);
1270         }
1271
1272         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1273                 cmd_uimg(&cmdbuf[5]);
1274         }
1275
1276         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1277                 cmd_time();
1278         }
1279
1280         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1281                 cmd_agup(&cmdbuf[5]);
1282         }
1283
1284         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1285                 cmd_asup(&cmdbuf[5]);
1286         }
1287
1288         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1289                 cmd_gpex(&cmdbuf[5]);
1290         }
1291
1292         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1293                 cmd_spex(&cmdbuf[5]);
1294         }
1295
1296         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1297                 cmd_conf(&cmdbuf[5]);
1298         }
1299
1300         else if (!strncasecmp(cmdbuf, "SEEN", 4)) {
1301                 cmd_seen(&cmdbuf[5]);
1302         }
1303
1304         else if (!strncasecmp(cmdbuf, "GTSN", 4)) {
1305                 cmd_gtsn(&cmdbuf[5]);
1306         }
1307
1308         else if (!strncasecmp(cmdbuf, "VIEW", 4)) {
1309                 cmd_view(&cmdbuf[5]);
1310         }
1311
1312         else if (!strncasecmp(cmdbuf, "ISME", 4)) {
1313                 cmd_isme(&cmdbuf[5]);
1314         }
1315
1316         else if (!DLoader_Exec_Cmd(cmdbuf)) {
1317                 cprintf("%d Unrecognized or unsupported command.\n",
1318                         ERROR + CMD_NOT_SUPPORTED);
1319                }
1320
1321         unbuffer_output();
1322
1323         /* Run any after-each-command routines registered by modules */
1324         PerformSessionHooks(EVT_CMD);
1325 }
1326
1327
1328 /*
1329  * This loop performs all asynchronous functions.
1330  */
1331 void do_async_loop(void) {
1332         PerformSessionHooks(EVT_ASYNC);
1333 }