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