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 (*ptr == '#') {
 341                                         *ptr = 0;
 342                                         break;
 343                                 }
 344                                 else ptr++;
 345                         }
 346                         while (isspace((buf[strlen(buf)-1]))) {
 347                                 buf[strlen(buf)-1] = 0;
 348                         }
 349                         if (hostname_to_dotted_quad(addrbuf, buf) == 0) {
 350                                 if ((strlen(public_clients) +
 351                                    strlen(addrbuf) + 2)
 352                                    < sizeof(public_clients)) {
 353                                         strcat(public_clients, "|");
 354                                         strcat(public_clients, addrbuf);
 355                                 }
 356                         }
 357                 }
 358                 fclose(fp);
 359                 pc_timestamp = time(NULL);
 360                 end_critical_section(S_PUBLIC_CLIENTS);
 361         }
 362
 363         lprintf(CTDL_DEBUG, "Checking whether %s is a local or public client\n",
 364                 CC->cs_addr);
 365         for (i=0; i<num_parms(public_clients); ++i) {
 366                 extract_token(addrbuf, public_clients, i, '|', sizeof addrbuf);
 367                 if (!strcasecmp(CC->cs_addr, addrbuf)) {
 368                         lprintf(CTDL_DEBUG, "... yes it is.\n");
 369                         return(1);
 370                 }
 371         }
 372
 373         /* No hits.  This is not a public client. */
 374         lprintf(CTDL_DEBUG, "... no it isn't.\n");
 375         return(0);
 376 }
 377
 378
 379 /*
 380  * the client is identifying itself to the server
 381  */
 382 void cmd_iden(char *argbuf)
 383 {
 384         int dev_code;
 385         int cli_code;
 386         int rev_level;
 387         char desc[128];
 388         char from_host[128];
 389         struct in_addr addr;
 390         int do_lookup = 0;
 391
 392         if (num_parms(argbuf)<4) {
 393                 cprintf("%d usage error\n", ERROR + ILLEGAL_VALUE);
 394                 return;
 395         }
 396
 397         dev_code = extract_int(argbuf,0);
 398         cli_code = extract_int(argbuf,1);
 399         rev_level = extract_int(argbuf,2);
 400         extract_token(desc, argbuf, 3, '|', sizeof desc);
 401
 402         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 403         from_host[sizeof from_host - 1] = 0;
 404         if (num_parms(argbuf)>=5) extract_token(from_host, argbuf, 4, '|', sizeof from_host);
 405
 406         CC->cs_clientdev = dev_code;
 407         CC->cs_clienttyp = cli_code;
 408         CC->cs_clientver = rev_level;
 409         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 410         CC->cs_clientname[31] = 0;
 411
 412         if (!IsEmptyStr(from_host)) {
 413                 if (CC->is_local_socket) do_lookup = 1;
 414                 else if (is_public_client()) do_lookup = 1;
 415         }
 416
 417         if (do_lookup) {
 418                 lprintf(CTDL_DEBUG, "Looking up hostname '%s'\n", from_host);
 419                 if ((addr.s_addr = inet_addr(from_host)) != -1) {
 420                         locate_host(CC->cs_host, sizeof CC->cs_host,
 421                                 CC->cs_addr, sizeof CC->cs_addr,
 422                                 &addr);
 423                 }
 424                 else {
 425                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 426                         CC->cs_host[sizeof CC->cs_host - 1] = 0;
 427                 }
 428         }
 429
 430         lprintf(CTDL_NOTICE, "Client %d/%d/%01d.%02d (%s) from %s\n",
 431                 dev_code,
 432                 cli_code,
 433                 (rev_level / 100),
 434                 (rev_level % 100),
 435                 desc,
 436                 CC->cs_host);
 437         cprintf("%d Ok\n",CIT_OK);
 438 }
 439
 440
 441 /*
 442  * display system messages or help
 443  */
 444 void cmd_mesg(char *mname)
 445 {
 446         FILE *mfp;
 447         char targ[256];
 448         char buf[256];
 449         char buf2[256];
 450         char *dirs[2];
 451         DIR *dp;
 452         struct dirent *d;
 453
 454         extract_token(buf, mname, 0, '|', sizeof buf);
 455
 456         dirs[0] = strdup(ctdl_message_dir);
 457         dirs[1] = strdup(ctdl_hlp_dir);
 458
 459         snprintf(buf2, sizeof buf2, "%s.%d.%d",
 460                 buf, CC->cs_clientdev, CC->cs_clienttyp);
 461
 462         /* If the client requested "?" then produce a listing */
 463         if (!strcmp(buf, "?")) {
 464                 cprintf("%d %s\n", LISTING_FOLLOWS, buf);
 465                 dp = opendir(dirs[1]);
 466                 if (dp != NULL) {
 467                         while (d = readdir(dp), d != NULL) {
 468                                 if (d->d_name[0] != '.') {
 469                                         cprintf(" %s\n", d->d_name);
 470                                 }
 471                         }
 472                         closedir(dp);
 473                 }
 474                 cprintf("000\n");
 475                 free(dirs[0]);
 476                 free(dirs[1]);
 477                 return;
 478         }
 479
 480         /* Otherwise, look for the requested file by name. */
 481         else {
 482                 mesg_locate(targ, sizeof targ, buf2, 2, (const char **)dirs);
 483                 if (IsEmptyStr(targ)) {
 484                         snprintf(buf2, sizeof buf2, "%s.%d",
 485                                                         buf, CC->cs_clientdev);
 486                         mesg_locate(targ, sizeof targ, buf2, 2,
 487                                                         (const char **)dirs);
 488                         if (IsEmptyStr(targ)) {
 489                                 mesg_locate(targ, sizeof targ, buf, 2,
 490                                                         (const char **)dirs);
 491                         }
 492                 }
 493         }
 494
 495         free(dirs[0]);
 496         free(dirs[1]);
 497
 498         if (IsEmptyStr(targ)) {
 499                 cprintf("%d '%s' not found.  (Searching in %s and %s)\n",
 500                         ERROR + FILE_NOT_FOUND,
 501                         mname,
 502                         ctdl_message_dir,
 503                         ctdl_hlp_dir
 504                 );
 505                 return;
 506         }
 507
 508         mfp = fopen(targ, "r");
 509         if (mfp==NULL) {
 510                 cprintf("%d Cannot open '%s': %s\n",
 511                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
 512                 return;
 513         }
 514         cprintf("%d %s\n", LISTING_FOLLOWS,buf);
 515
 516         while (fgets(buf, (sizeof buf - 1), mfp) != NULL) {
 517                 buf[strlen(buf)-1] = 0;
 518                 do_help_subst(buf);
 519                 cprintf("%s\n",buf);
 520         }
 521
 522         fclose(mfp);
 523         cprintf("000\n");
 524 }
 525
 526
 527 /*
 528  * enter system messages or help
 529  */
 530 void cmd_emsg(char *mname)
 531 {
 532         FILE *mfp;
 533         char targ[256];
 534         char buf[256];
 535         char *dirs[2];
 536         int a;
 537
 538         unbuffer_output();
 539
 540         if (CtdlAccessCheck(ac_aide)) return;
 541
 542         extract_token(buf, mname, 0, '|', sizeof buf);
 543         for (a=0; !IsEmptyStr(&buf[a]); ++a) {          /* security measure */
 544                 if (buf[a] == '/') buf[a] = '.';
 545         }
 546
 547         dirs[0] = strdup(ctdl_message_dir);
 548         dirs[1] = strdup(ctdl_hlp_dir);
 549
 550         mesg_locate(targ, sizeof targ, buf, 2, (const char**)dirs);
 551         free(dirs[0]);
 552         free(dirs[1]);
 553
 554         if (IsEmptyStr(targ)) {
 555                 snprintf(targ, sizeof targ,
 556                                  "%s/%s",
 557                                  ctdl_hlp_dir, buf);
 558         }
 559
 560         mfp = fopen(targ,"w");
 561         if (mfp==NULL) {
 562                 cprintf("%d Cannot open '%s': %s\n",
 563                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
 564                 return;
 565         }
 566         cprintf("%d %s\n", SEND_LISTING, targ);
 567
 568         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 569                 fprintf(mfp, "%s\n", buf);
 570         }
 571
 572         fclose(mfp);
 573 }
 574
 575
 576 /* Don't show the names of private rooms unless the viewing
 577  * user also knows the rooms.
 578  */
 579 void GenerateRoomDisplay(char *real_room,
 580                         struct CitContext *viewed,
 581                         struct CitContext *viewer) {
 582
 583         int ra;
 584
 585         strcpy(real_room, viewed->room.QRname);
 586         if (viewed->room.QRflags & QR_MAILBOX) {
 587                 strcpy(real_room, &real_room[11]);
 588         }
 589         if (viewed->room.QRflags & QR_PRIVATE) {
 590                 CtdlRoomAccess(&viewed->room, &viewer->user, &ra, NULL);
 591                 if ( (ra & UA_KNOWN) == 0) {
 592                         strcpy(real_room, "<private room>");
 593                 }
 594         }
 595
 596         if (viewed->cs_flags & CS_CHAT) {
 597                 while (strlen(real_room) < 14)
 598                         strcat(real_room, " ");
 599
 600                 strcpy(&real_room[14], "<chat>");
 601         }
 602
 603 }
 604
 605 /*
 606  * Convenience function.
 607  */
 608 int CtdlAccessCheck(int required_level) {
 609
 610         if (CC->internal_pgm) return(0);
 611         if (required_level >= ac_internal) {
 612                 cprintf("%d This is not a user-level command.\n",
 613                         ERROR + HIGHER_ACCESS_REQUIRED);
 614                 return(-1);
 615         }
 616
 617         if ((required_level >= ac_logged_in) && (CC->logged_in == 0)) {
 618                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 619                 return(-1);
 620         }
 621
 622         if (CC->user.axlevel >= 6) return(0);
 623         if (required_level >= ac_aide) {
 624                 cprintf("%d This command requires Aide access.\n",
 625                         ERROR + HIGHER_ACCESS_REQUIRED);
 626                 return(-1);
 627         }
 628
 629         if (is_room_aide()) return(0);
 630         if (required_level >= ac_room_aide) {
 631                 cprintf("%d This command requires Aide or Room Aide access.\n",
 632                         ERROR + HIGHER_ACCESS_REQUIRED);
 633                 return(-1);
 634         }
 635
 636         /* shhh ... succeed quietly */
 637         return(0);
 638 }
 639
 640
 641
 642 /*
 643  * Terminate another running session
 644  */
 645 void cmd_term(char *cmdbuf)
 646 {
 647         int session_num;
 648         struct CitContext *ccptr;
 649         int found_it = 0;
 650         int allowed = 0;
 651
 652         session_num = extract_int(cmdbuf, 0);
 653         if (session_num == CC->cs_pid) {
 654                 cprintf("%d You can't kill your own session.\n", ERROR + ILLEGAL_VALUE);
 655                 return;
 656         }
 657
 658         lprintf(CTDL_DEBUG, "Locating session to kill\n");
 659         begin_critical_section(S_SESSION_TABLE);
 660         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 661                 if (session_num == ccptr->cs_pid) {
 662                         found_it = 1;
 663                         if ((ccptr->user.usernum == CC->user.usernum)
 664                            || (CC->user.axlevel >= 6)) {
 665                                 allowed = 1;
 666                                 ccptr->kill_me = 1;
 667                         }
 668                         else {
 669                                 allowed = 0;
 670                         }
 671                 }
 672         }
 673         end_critical_section(S_SESSION_TABLE);
 674
 675         if (found_it) {
 676                 if (allowed) {
 677                         cprintf("%d Session terminated.\n", CIT_OK);
 678                 }
 679                 else {
 680                         cprintf("%d You are not allowed to do that.\n",
 681                                 ERROR + HIGHER_ACCESS_REQUIRED);
 682                 }
 683         }
 684         else {
 685                 cprintf("%d No such session.\n", ERROR + ILLEGAL_VALUE);
 686         }
 687 }
 688
 689
 690
 691
 692
 693 /*
 694  * get the paginator prompt
 695  */
 696 void cmd_more(void) {
 697         cprintf("%d %s\n", CIT_OK, config.c_moreprompt);
 698 }
 699
 700 /*
 701  * echo
 702  */
 703 void cmd_echo(char *etext)
 704 {
 705         cprintf("%d %s\n", CIT_OK, etext);
 706 }
 707
 708
 709
 710 /*
 711  * identify as internal program
 712  */
 713 void cmd_ipgm(char *argbuf)
 714 {
 715         int secret;
 716
 717         secret = extract_int(argbuf, 0);
 718
 719         /* For security reasons, we do NOT allow this command to run
 720          * over the network.  Local sockets only.
 721          */
 722         if (!CC->is_local_socket) {
 723                 sleep(5);
 724                 cprintf("%d Authentication failed.\n",
 725                         ERROR + PASSWORD_REQUIRED);
 726         }
 727         else if (secret == config.c_ipgm_secret) {
 728                 CC->internal_pgm = 1;
 729                 strcpy(CC->curr_user, "<internal program>");
 730                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 731                 cprintf("%d Authenticated as an internal program.\n", CIT_OK);
 732         }
 733         else {
 734                 sleep(5);
 735                 cprintf("%d Authentication failed.\n",
 736                         ERROR + PASSWORD_REQUIRED);
 737                 lprintf(CTDL_ERR, "Warning: ipgm authentication failed.\n");
 738                 CC->kill_me = 1;
 739         }
 740
 741         /* Now change the ipgm secret for the next round.
 742          * (Disabled because it breaks concurrent scripts.  The fact that
 743          * we no longer accept IPGM over the network should be sufficient
 744          * to prevent brute-force attacks.  If you don't agree, uncomment
 745          * this block.)
 746         get_config();
 747         config.c_ipgm_secret = rand();
 748         put_config();
 749         */
 750 }
 751
 752
 753 /*
 754  * Shut down the server
 755  */
 756 void cmd_down(char *argbuf) {
 757         char *Reply ="%d Shutting down server.  Goodbye.\n";
 758
 759         if (CtdlAccessCheck(ac_aide)) return;
 760
 761         if (!IsEmptyStr(argbuf))
 762         {
 763                 int state = CIT_OK;
 764                 restart_server = extract_int(argbuf, 0);
 765
 766                 if (restart_server > 0)
 767                         Reply = "%d Restarting server.  See you soon.\n";
 768                 if ((restart_server > 0) && !running_as_daemon)
 769                 {
 770                         lprintf(CTDL_ERR, "The user requested restart, but not running as deamon! Geronimooooooo!\n");
 771                         Reply = "%d Warning, not running in deamon mode. maybe we will come up again, but don't lean on it.\n";
 772                         state = ERROR;
 773                 }
 774                 cprintf(Reply, state);
 775         }
 776         else
 777         {
 778                 cprintf(Reply, CIT_OK);
 779         }
 780         time_to_die = 1;
 781 }
 782
 783 /*
 784  * Halt the server without exiting the server process.
 785  */
 786 void cmd_halt(void) {
 787
 788         if (CtdlAccessCheck(ac_aide)) return;
 789
 790         cprintf("%d Halting server.  Goodbye.\n", CIT_OK);
 791         time_to_die = 1;
 792         shutdown_and_halt = 1;
 793 }
 794
 795 /*
 796  * Schedule or cancel a server shutdown
 797  */
 798 void cmd_scdn(char *argbuf)
 799 {
 800         int new_state;
 801         int state = CIT_OK;
 802         char *Reply = "%d %d\n";
 803
 804         if (CtdlAccessCheck(ac_aide)) return;
 805
 806         new_state = extract_int(argbuf, 0);
 807         if ((new_state == 2) || (new_state == 3))
 808         {
 809                 restart_server = 1;
 810                 if (!running_as_daemon)
 811                 {
 812                         lprintf(CTDL_ERR, "The user requested restart, but not running as deamon! Geronimooooooo!\n");
 813                         Reply = "%d %d Warning, not running in deamon mode. maybe we will come up again, but don't lean on it.\n";
 814                         state = ERROR;
 815                 }
 816
 817                 restart_server = extract_int(argbuf, 0);
 818                 new_state -= 2;
 819         }
 820         if ((new_state == 0) || (new_state == 1)) {
 821                 ScheduledShutdown = new_state;
 822         }
 823         cprintf(Reply, state, ScheduledShutdown);
 824 }
 825
 826
 827 /*
 828  * Set or unset asynchronous protocol mode
 829  */
 830 void cmd_asyn(char *argbuf)
 831 {
 832         int new_state;
 833
 834         new_state = extract_int(argbuf, 0);
 835         if ((new_state == 0) || (new_state == 1)) {
 836                 CC->is_async = new_state;
 837         }
 838         cprintf("%d %d\n", CIT_OK, CC->is_async);
 839 }
 840
 841
 842 /*
 843  * Generate a "nonce" for APOP-style authentication.
 844  *
 845  * RFC 1725 et al specify a PID to be placed in front of the nonce.
 846  * Quoth BTX: That would be stupid.
 847  */
 848 void generate_nonce(struct CitContext *con) {
 849         struct timeval tv;
 850
 851         memset(con->cs_nonce, NONCE_SIZE, 0);
 852         gettimeofday(&tv, NULL);
 853         memset(con->cs_nonce, NONCE_SIZE, 0);
 854         snprintf(con->cs_nonce, NONCE_SIZE, "<%d%ld@%s>",
 855                 rand(), (long)tv.tv_usec, config.c_fqdn);
 856 }
 857
 858
 859
 860
 861 /*
 862  * Back-end function for starting a session
 863  */
 864 void begin_session(struct CitContext *con)
 865 {
 866         socklen_t len;
 867         struct sockaddr_in sin;
 868
 869         /*
 870          * Initialize some variables specific to our context.
 871          */
 872         con->logged_in = 0;
 873         con->internal_pgm = 0;
 874         con->download_fp = NULL;
 875         con->upload_fp = NULL;
 876         con->FirstExpressMessage = NULL;
 877         time(&con->lastcmd);
 878         time(&con->lastidle);
 879         strcpy(con->lastcmdname, "    ");
 880         strcpy(con->cs_clientname, "(unknown)");
 881         strcpy(con->curr_user, NLI);
 882         strcpy(con->net_node, "");
 883         strcpy(con->fake_username, "");
 884         strcpy(con->fake_hostname, "");
 885         strcpy(con->fake_roomname, "");
 886         generate_nonce(con);
 887         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 888         safestrncpy(con->cs_addr, "", sizeof con->cs_addr);
 889         con->cs_host[sizeof con->cs_host - 1] = 0;
 890         len = sizeof sin;
 891         if (!CC->is_local_socket) {
 892                 if (!getpeername(con->client_socket, (struct sockaddr *) &sin, &len)) {
 893                         locate_host(con->cs_host, sizeof con->cs_host,
 894                                 con->cs_addr, sizeof con->cs_addr,
 895                                 &sin.sin_addr
 896                         );
 897                 }
 898         }
 899         else {
 900                 strcpy(con->cs_host, "");
 901         }
 902         con->cs_flags = 0;
 903         con->upload_type = UPL_FILE;
 904         con->dl_is_net = 0;
 905
 906         con->nologin = 0;
 907         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions)) {
 908                 con->nologin = 1;
 909         }
 910
 911         lprintf(CTDL_NOTICE, "Session started.\n");
 912
 913         /* Run any session startup routines registered by loadable modules */
 914         PerformSessionHooks(EVT_START);
 915 }
 916
 917
 918 void citproto_begin_session() {
 919         if (CC->nologin==1) {
 920                 cprintf("%d %s: Too many users are already online (maximum is %d)\n",
 921                         ERROR + MAX_SESSIONS_EXCEEDED,
 922                         config.c_nodename, config.c_maxsessions
 923                 );
 924                 CC->kill_me = 1;
 925         }
 926         else {
 927                 cprintf("%d %s Citadel server ready.\n",
 928                         CIT_OK, config.c_nodename);
 929         }
 930 }
 931
 932
 933
 934
 935 /*
 936  * This loop recognizes all server commands.
 937  */
 938 void do_command_loop(void) {
 939         char cmdbuf[SIZ];
 940
 941         time(&CC->lastcmd);
 942         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 943         if (client_getln(cmdbuf, sizeof cmdbuf) < 1) {
 944                 lprintf(CTDL_ERR, "Client disconnected: ending session.\n");
 945                 CC->kill_me = 1;
 946                 return;
 947         }
 948
 949         /* Log the server command, but don't show passwords... */
 950         if ( (strncasecmp(cmdbuf, "PASS", 4))
 951            && (strncasecmp(cmdbuf, "SETP", 4)) ) {
 952                 lprintf(CTDL_INFO, "%s\n", cmdbuf);
 953         }
 954         else {
 955                 lprintf(CTDL_INFO, "<password command sent>\n");
 956         }
 957
 958         buffer_output();
 959
 960         /*
 961          * Let other clients see the last command we executed, and
 962          * update the idle time, but not NOOP, QNOP, PEXP, GEXP, RWHO, or TIME.
 963          */
 964         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 965            && (strncasecmp(cmdbuf, "QNOP", 4))
 966            && (strncasecmp(cmdbuf, "PEXP", 4))
 967            && (strncasecmp(cmdbuf, "GEXP", 4))
 968            && (strncasecmp(cmdbuf, "RWHO", 4))
 969            && (strncasecmp(cmdbuf, "TIME", 4)) ) {
 970                 strcpy(CC->lastcmdname, "    ");
 971                 safestrncpy(CC->lastcmdname, cmdbuf, sizeof(CC->lastcmdname));
 972                 time(&CC->lastidle);
 973         }
 974
 975         if ((strncasecmp(cmdbuf, "ENT0", 4))
 976            && (strncasecmp(cmdbuf, "MESG", 4))
 977            && (strncasecmp(cmdbuf, "MSGS", 4)))
 978         {
 979            CC->cs_flags &= ~CS_POSTING;
 980         }
 981
 982         if (!strncasecmp(cmdbuf, "NOOP", 4)) {
 983                 cprintf("%d%cok\n", CIT_OK, CtdlCheckExpress() );
 984         }
 985
 986         else if (!strncasecmp(cmdbuf, "QNOP", 4)) {
 987                 /* do nothing, this command returns no response */
 988         }
 989
 990         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 991                 cprintf("%d Goodbye.\n", CIT_OK);
 992                 CC->kill_me = 1;
 993         }
 994
 995         else if (!strncasecmp(cmdbuf,"ASYN",4)) {
 996                 cmd_asyn(&cmdbuf[5]);
 997         }
 998
 999         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
1000                 if (CC->logged_in) logout(CC);
1001                 cprintf("%d logged out.\n", CIT_OK);
1002         }
1003
1004         else if (!strncasecmp(cmdbuf,"USER",4)) {
1005                 cmd_user(&cmdbuf[5]);
1006         }
1007
1008         else if (!strncasecmp(cmdbuf,"PASS",4)) {
1009                 cmd_pass(&cmdbuf[5]);
1010         }
1011
1012         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
1013                 cmd_newu(&cmdbuf[5]);
1014         }
1015
1016         else if (!strncasecmp(cmdbuf,"CREU",4)) {
1017                 cmd_creu(&cmdbuf[5]);
1018         }
1019
1020         else if (!strncasecmp(cmdbuf,"SETP",4)) {
1021                 cmd_setp(&cmdbuf[5]);
1022         }
1023
1024         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
1025                 cmd_lrms(&cmdbuf[5]);
1026         }
1027
1028         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
1029                 cmd_lkra(&cmdbuf[5]);
1030         }
1031
1032         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
1033                 cmd_lkrn(&cmdbuf[5]);
1034         }
1035
1036         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
1037                 cmd_lkro(&cmdbuf[5]);
1038         }
1039
1040         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
1041                 cmd_lzrm(&cmdbuf[5]);
1042         }
1043
1044         else if (!strncasecmp(cmdbuf,"LPRM",4)) {
1045                 cmd_lprm(&cmdbuf[5]);
1046         }
1047
1048         else if (!strncasecmp(cmdbuf,"GETU",4)) {
1049                 cmd_getu();
1050         }
1051
1052         else if (!strncasecmp(cmdbuf,"SETU",4)) {
1053                 cmd_setu(&cmdbuf[5]);
1054         }
1055
1056         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
1057                 cmd_goto(&cmdbuf[5]);
1058         }
1059
1060         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
1061                 cmd_msgs(&cmdbuf[5]);
1062         }
1063
1064         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
1065                 cmd_whok();
1066         }
1067
1068         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
1069                 cmd_rdir();
1070         }
1071
1072         else if (!strncasecmp(cmdbuf,"EUID",4)) {
1073                 cmd_euid(&cmdbuf[5]);
1074         }
1075
1076         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
1077                 cmd_msg0(&cmdbuf[5]);
1078         }
1079
1080         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
1081                 cmd_msg2(&cmdbuf[5]);
1082         }
1083
1084         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
1085                 cmd_msg3(&cmdbuf[5]);
1086         }
1087
1088         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
1089                 cmd_msg4(&cmdbuf[5]);
1090         }
1091
1092         else if (!strncasecmp(cmdbuf,"MSGP",4)) {
1093                 cmd_msgp(&cmdbuf[5]);
1094         }
1095
1096         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
1097                 cmd_opna(&cmdbuf[5]);
1098         }
1099
1100         else if (!strncasecmp(cmdbuf,"DLAT",4)) {
1101                 cmd_dlat(&cmdbuf[5]);
1102         }
1103
1104         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1105                 cmd_info();
1106         }
1107
1108         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1109                 cmd_slrp(&cmdbuf[5]);
1110         }
1111
1112         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1113                 cmd_invt_kick(&cmdbuf[5],1);
1114         }
1115
1116         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1117                 cmd_invt_kick(&cmdbuf[5],0);
1118         }
1119
1120         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1121                 cmd_getr();
1122         }
1123
1124         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1125                 cmd_setr(&cmdbuf[5]);
1126         }
1127
1128         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1129                 cmd_geta();
1130         }
1131
1132         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1133                 cmd_seta(&cmdbuf[5]);
1134         }
1135
1136         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1137                 cmd_ent0(&cmdbuf[5]);
1138         }
1139
1140         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1141                 cmd_rinf();
1142         }
1143
1144         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1145                 cmd_dele(&cmdbuf[5]);
1146         }
1147
1148         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1149                 cmd_kill(&cmdbuf[5]);
1150         }
1151
1152         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1153                 cmd_cre8(&cmdbuf[5]);
1154         }
1155
1156         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1157                 cmd_move(&cmdbuf[5]);
1158         }
1159
1160         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1161                 cmd_forg();
1162         }
1163
1164         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1165                 cmd_mesg(&cmdbuf[5]);
1166         }
1167
1168         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1169                 cmd_emsg(&cmdbuf[5]);
1170         }
1171
1172         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1173                 cmd_gnur();
1174         }
1175
1176         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1177                 cmd_vali(&cmdbuf[5]);
1178         }
1179
1180         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1181                 cmd_einf(&cmdbuf[5]);
1182         }
1183
1184         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1185                 cmd_list(&cmdbuf[5]);
1186         }
1187
1188         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1189                 cmd_chek();
1190         }
1191
1192         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1193                 cmd_delf(&cmdbuf[5]);
1194         }
1195
1196         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1197                 cmd_movf(&cmdbuf[5]);
1198         }
1199
1200         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1201                 cmd_netf(&cmdbuf[5]);
1202         }
1203
1204         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1205                 cmd_open(&cmdbuf[5]);
1206         }
1207
1208         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1209                 cmd_clos();
1210         }
1211
1212         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1213                 cmd_uopn(&cmdbuf[5]);
1214         }
1215
1216         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1217                 cmd_ucls(&cmdbuf[5]);
1218         }
1219
1220         else if (!strncasecmp(cmdbuf,"READ",4)) {
1221                 cmd_read(&cmdbuf[5]);
1222         }
1223
1224         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1225                 cmd_writ(&cmdbuf[5]);
1226         }
1227
1228         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1229                 cmd_qusr(&cmdbuf[5]);
1230         }
1231
1232         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1233                 cmd_echo(&cmdbuf[5]);
1234         }
1235
1236         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1237                 cmd_oimg(&cmdbuf[5]);
1238         }
1239
1240         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1241                 cmd_more();
1242         }
1243
1244         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1245                 cmd_ndop(&cmdbuf[5]);
1246         }
1247
1248         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1249                 cmd_nuop(&cmdbuf[5]);
1250         }
1251
1252         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1253                 cmd_lflr();
1254         }
1255
1256         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1257                 cmd_cflr(&cmdbuf[5]);
1258         }
1259
1260         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1261                 cmd_kflr(&cmdbuf[5]);
1262         }
1263
1264         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1265                 cmd_eflr(&cmdbuf[5]);
1266         }
1267
1268         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1269                 cmd_iden(&cmdbuf[5]);
1270         }
1271
1272         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1273                 cmd_ipgm(&cmdbuf[5]);
1274         }
1275
1276         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1277                 cmd_term(&cmdbuf[5]);
1278         }
1279
1280         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1281                 cmd_down(&cmdbuf[5]);
1282         }
1283
1284         else if (!strncasecmp(cmdbuf,"HALT",4)) {
1285                 cmd_halt();
1286         }
1287
1288         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1289                 cmd_scdn(&cmdbuf[5]);
1290         }
1291
1292         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1293                 cmd_uimg(&cmdbuf[5]);
1294         }
1295
1296         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1297                 cmd_time();
1298         }
1299
1300         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1301                 cmd_agup(&cmdbuf[5]);
1302         }
1303
1304         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1305                 cmd_asup(&cmdbuf[5]);
1306         }
1307
1308         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1309                 cmd_gpex(&cmdbuf[5]);
1310         }
1311
1312         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1313                 cmd_spex(&cmdbuf[5]);
1314         }
1315
1316         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1317                 cmd_conf(&cmdbuf[5]);
1318         }
1319
1320         else if (!strncasecmp(cmdbuf, "SEEN", 4)) {
1321                 cmd_seen(&cmdbuf[5]);
1322         }
1323
1324         else if (!strncasecmp(cmdbuf, "GTSN", 4)) {
1325                 cmd_gtsn(&cmdbuf[5]);
1326         }
1327
1328         else if (!strncasecmp(cmdbuf, "VIEW", 4)) {
1329                 cmd_view(&cmdbuf[5]);
1330         }
1331
1332         else if (!strncasecmp(cmdbuf, "ISME", 4)) {
1333                 cmd_isme(&cmdbuf[5]);
1334         }
1335
1336         else if (!DLoader_Exec_Cmd(cmdbuf)) {
1337                 cprintf("%d Unrecognized or unsupported command.\n",
1338                         ERROR + CMD_NOT_SUPPORTED);
1339                }
1340
1341         unbuffer_output();
1342
1343         /* Run any after-each-command routines registered by modules */
1344         PerformSessionHooks(EVT_CMD);
1345 }
1346
1347
1348 /*
1349  * This loop performs all asynchronous functions.
1350  */
1351 void do_async_loop(void) {
1352         PerformSessionHooks(EVT_ASYNC);
1353 }