citadel/citserver.c

   1 /*
   2  * $Id$
   3  *
   4  * Main source module for the Citadel server
   5  *
   6  */
   7
   8 #ifdef DLL_EXPORT
   9 #define IN_LIBCIT
  10 #endif
  11
  12 #include "sysdep.h"
  13 #include <stdlib.h>
  14 #include <unistd.h>
  15 #include <stdio.h>
  16 #include <fcntl.h>
  17 #include <signal.h>
  18 #include <sys/types.h>
  19 #include <sys/stat.h>
  20
  21
  22 #if TIME_WITH_SYS_TIME
  23 # include <sys/time.h>
  24 # include <time.h>
  25 #else
  26 # if HAVE_SYS_TIME_H
  27 #  include <sys/time.h>
  28 # else
  29 #  include <time.h>
  30 # endif
  31 #endif
  32
  33 #include <ctype.h>
  34 #include <string.h>
  35 #include <errno.h>
  36 #include <limits.h>
  37 /* #include <dlfcn.h> */
  38 #include <netdb.h>
  39 #include <sys/types.h>
  40 #include <sys/socket.h>
  41 #include <netinet/in.h>
  42 #include <arpa/inet.h>
  43 #include "citadel.h"
  44 #include "server.h"
  45 #include "serv_extensions.h"
  46 #include "sysdep_decls.h"
  47 #include "citserver.h"
  48 #include "config.h"
  49 #include "database.h"
  50 #include "housekeeping.h"
  51 #include "user_ops.h"
  52 #include "msgbase.h"
  53 #include "support.h"
  54 #include "locate_host.h"
  55 #include "room_ops.h"
  56 #include "file_ops.h"
  57 #include "policy.h"
  58 #include "control.h"
  59 #include "tools.h"
  60
  61 #ifndef HAVE_SNPRINTF
  62 #include "snprintf.h"
  63 #endif
  64
  65 struct CitContext *ContextList = NULL;
  66 struct CitContext* next_session = NULL;
  67 char *unique_session_numbers;
  68 int ScheduledShutdown = 0;
  69 int do_defrag = 0;
  70 time_t server_startup_time;
  71 char pid_file_name[PATH_MAX];
  72
  73 /*
  74  * Various things that need to be initialized at startup
  75  */
  76 void master_startup(void) {
  77         struct timeval tv;
  78         unsigned int seed;
  79         FILE *urandom;
  80         struct ctdlroom qrbuf;
  81         FILE *pidfile_fp;
  82
  83         lprintf(CTDL_DEBUG, "master_startup() started\n");
  84         time(&server_startup_time);
  85
  86         /* pid file.  If we go FSSTND this should end up in 'localstatedir' */
  87         snprintf(pid_file_name, sizeof pid_file_name, "./citadel.pid");
  88         pidfile_fp = fopen(pid_file_name, "w");
  89         if (pidfile_fp != NULL) {
  90                 fprintf(pidfile_fp, "%d\n", (int)getpid());
  91                 fclose(pidfile_fp);
  92         }
  93
  94         lprintf(CTDL_INFO, "Opening databases\n");
  95         open_databases();
  96
  97         if (do_defrag) {
  98                 defrag_databases();
  99         }
 100
 101         check_ref_counts();
 102
 103         lprintf(CTDL_INFO, "Creating base rooms (if necessary)\n");
 104         create_room(config.c_baseroom,  0, "", 0, 1, 0, VIEW_BBS);
 105         create_room(AIDEROOM,           3, "", 0, 1, 0, VIEW_BBS);
 106         create_room(SYSCONFIGROOM,      3, "", 0, 1, 0, VIEW_BBS);
 107         create_room(config.c_twitroom,  0, "", 0, 1, 0, VIEW_BBS);
 108
 109         /* The "Local System Configuration" room doesn't need to be visible */
 110         if (lgetroom(&qrbuf, SYSCONFIGROOM) == 0) {
 111                 qrbuf.QRflags2 |= QR2_SYSTEM;
 112                 lputroom(&qrbuf);
 113         }
 114
 115         /*
 116          * Create a room in which we can deposit "deleted" messages for
 117          * deferred deletion.  This will silently fail if the room already
 118          * exists, and that's perfectly ok, because we want it to exist.
 119          */
 120         create_room(DELETED_MSGS_ROOM, 3, "", 0, 1, 0, VIEW_MAILBOX);
 121
 122         /*
 123          * Make sure it's set to be a "system room" so it doesn't show up
 124          * in the <K>nown rooms list for Aides.  Also set the message expire
 125          * policy to "by count, 1 message" so everything gets deleted all
 126          * the time (we can't set it to 0 because that's invalid, so we keep
 127          * a single message around).
 128          */
 129         if (lgetroom(&qrbuf, DELETED_MSGS_ROOM) == 0) {
 130                 qrbuf.QRflags2 |= QR2_SYSTEM;
 131                 qrbuf.QRep.expire_mode = EXPIRE_NUMMSGS;
 132                 qrbuf.QRep.expire_value = 1;
 133                 lputroom(&qrbuf);
 134         }
 135
 136         lprintf(CTDL_INFO, "Seeding the pseudo-random number generator...\n");
 137         urandom = fopen("/dev/urandom", "r");
 138         if (urandom != NULL) {
 139                 fread(&seed, sizeof seed, 1, urandom);
 140                 fclose(urandom);
 141         }
 142         else {
 143                 gettimeofday(&tv, NULL);
 144                 seed = tv.tv_usec;
 145         }
 146         srandom(seed);
 147
 148         lprintf(CTDL_INFO, "Initializing ipgm secret\n");
 149         get_config();
 150         config.c_ipgm_secret = rand();
 151         put_config();
 152
 153         lprintf(CTDL_DEBUG, "master_startup() finished\n");
 154 }
 155
 156
 157 /*
 158  * Cleanup routine to be called when the server is shutting down.
 159  */
 160 void master_cleanup(int exitcode) {
 161         struct CleanupFunctionHook *fcn;
 162         static int already_cleaning_up = 0;
 163
 164         if (already_cleaning_up) while(1) sleep(1);
 165         already_cleaning_up = 1;
 166
 167         /* Run any cleanup routines registered by loadable modules */
 168         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
 169                 (*fcn->h_function_pointer)();
 170         }
 171
 172         /* Shut down the indexer thread */
 173         lprintf(CTDL_INFO, "Waiting for the indexer thread to shut down\n");
 174         pthread_join(indexer_thread_tid, NULL);
 175
 176         /* Shut down the checkpoint thread */
 177         lprintf(CTDL_INFO, "Waiting for the checkpoint thread to shut down\n");
 178         pthread_join(checkpoint_thread_tid, NULL);
 179
 180         /* Close databases */
 181         lprintf(CTDL_INFO, "Closing databases\n");
 182         close_databases();
 183
 184         /* Do system-dependent stuff */
 185         sysdep_master_cleanup();
 186
 187 #ifdef DEBUG_MEMORY_LEAKS
 188         dump_heap();
 189 #endif
 190
 191         /* Now go away. */
 192         lprintf(CTDL_NOTICE, "citserver: Exiting with status %d\n", exitcode);
 193         fflush(stdout); fflush(stderr);
 194
 195         unlink(pid_file_name);
 196         exit(exitcode);
 197 }
 198
 199
 200
 201 /*
 202  * Terminate a session.
 203  */
 204 void RemoveContext (struct CitContext *con)
 205 {
 206         if (con==NULL) {
 207                 lprintf(CTDL_ERR,
 208                         "WARNING: RemoveContext() called with NULL!\n");
 209                 return;
 210         }
 211         lprintf(CTDL_DEBUG, "RemoveContext() session %d\n", con->cs_pid);
 212
 213         /* Run any cleanup routines registered by loadable modules.
 214          * Note: We have to "become_session()" because the cleanup functions
 215          *       might make references to "CC" assuming it's the right one.
 216          */
 217         become_session(con);
 218         PerformSessionHooks(EVT_STOP);
 219         become_session(NULL);
 220
 221         /* Now handle all of the administrivia. */
 222         lprintf(CTDL_DEBUG, "Calling logout(%d)\n", con->cs_pid);
 223         logout(con);
 224
 225         lprintf(CTDL_NOTICE, "[%3d] Session ended.\n", con->cs_pid);
 226
 227         /* If the client is still connected, blow 'em away. */
 228         lprintf(CTDL_DEBUG, "Closing socket %d\n", con->client_socket);
 229         close(con->client_socket);
 230
 231         lprintf(CTDL_DEBUG, "Done with RemoveContext()\n");
 232 }
 233
 234
 235
 236
 237
 238 /*
 239  * cmd_info()  -  tell the client about this server
 240  */
 241 void cmd_info(void) {
 242         cprintf("%d Server info:\n", LISTING_FOLLOWS);
 243         cprintf("%d\n", CC->cs_pid);
 244         cprintf("%s\n", config.c_nodename);
 245         cprintf("%s\n", config.c_humannode);
 246         cprintf("%s\n", config.c_fqdn);
 247         cprintf("%s\n", CITADEL);
 248         cprintf("%d\n", REV_LEVEL);
 249         cprintf("%s\n", config.c_site_location);
 250         cprintf("%s\n", config.c_sysadm);
 251         cprintf("%d\n", SERVER_TYPE);
 252         cprintf("%s\n", config.c_moreprompt);
 253         cprintf("1\n"); /* 1 = yes, this system supports floors */
 254         cprintf("1\n"); /* 1 = we support the extended paging options */
 255         cprintf("%s\n", CC->cs_nonce);
 256         cprintf("1\n"); /* 1 = yes, this system supports the QNOP command */
 257 #ifdef HAVE_LDAP
 258         cprintf("1\n"); /* 1 = yes, this server is LDAP-enabled */
 259 #else
 260         cprintf("0\n"); /* 1 = no, this server is not LDAP-enabled */
 261 #endif
 262         cprintf("000\n");
 263 }
 264
 265
 266 /*
 267  * returns an asterisk if there are any instant messages waiting,
 268  * space otherwise.
 269  */
 270 char CtdlCheckExpress(void) {
 271         if (CC->FirstExpressMessage == NULL) {
 272                 return(' ');
 273         }
 274         else {
 275                 return('*');
 276         }
 277 }
 278
 279 void cmd_time(void)
 280 {
 281    time_t tv;
 282    struct tm tmp;
 283
 284    tv = time(NULL);
 285    localtime_r(&tv, &tmp);
 286
 287    /* timezone and daylight global variables are not portable. */
 288 #ifdef HAVE_STRUCT_TM_TM_GMTOFF
 289    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, tmp.tm_gmtoff, tmp.tm_isdst);
 290 #else
 291    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, timezone, tmp.tm_isdst);
 292 #endif
 293 }
 294
 295
 296 /*
 297  * Check originating host against the public_clients file.  This determines
 298  * whether the client is allowed to change the hostname for this session
 299  * (for example, to show the location of the user rather than the location
 300  * of the client).
 301  */
 302 int is_public_client(void)
 303 {
 304         char buf[1024];
 305         char addrbuf[1024];
 306         FILE *fp;
 307         int i;
 308         struct stat statbuf;
 309         static time_t pc_timestamp = 0;
 310         static char public_clients[SIZ];
 311
 312 #ifndef HAVE_ETC
 313 #define PUBLIC_CLIENTS "./public_clients"
 314 #else
 315 #define PUBLIC_CLIENTS ETC_DIR"/public_clients"
 316 #endif
 317
 318         /*
 319          * Check the time stamp on the public_clients file.  If it's been
 320          * updated since the last time we were here (or if this is the first
 321          * time we've been through the loop), read its contents and learn
 322          * the IP addresses of the listed hosts.
 323          */
 324         if (stat(PUBLIC_CLIENTS, &statbuf) != 0) {
 325                 /* No public_clients file exists, so bail out */
 326                 lprintf(CTDL_WARNING, "Warning: '%s' does not exist\n", PUBLIC_CLIENTS);
 327                 return(0);
 328         }
 329
 330         if (statbuf.st_mtime > pc_timestamp) {
 331                 begin_critical_section(S_PUBLIC_CLIENTS);
 332                 lprintf(CTDL_INFO, "Loading %s\n", PUBLIC_CLIENTS);
 333
 334                 safestrncpy(public_clients, "127.0.0.1", sizeof public_clients);
 335                 if (hostname_to_dotted_quad(addrbuf, config.c_fqdn) == 0) {
 336                         strcat(public_clients, "|");
 337                         strcat(public_clients, addrbuf);
 338                 }
 339
 340                 fp = fopen(
 341 #ifndef HAVE_ETC
 342                                    "."
 343 #else
 344                                    ETC_DIR
 345 #endif
 346                                    "/public_clients", "r");
 347                 if (fp != NULL) while (fgets(buf, sizeof buf, fp)!=NULL) {
 348                         for (i=0; i<strlen(buf); ++i) {
 349                                 if (buf[i] == '#') buf[i] = 0;
 350                         }
 351                         while (isspace((buf[strlen(buf)-1]))) {
 352                                 buf[strlen(buf)-1] = 0;
 353                         }
 354                         if (hostname_to_dotted_quad(addrbuf, buf) == 0) {
 355                                 if ((strlen(public_clients) +
 356                                    strlen(addrbuf) + 2)
 357                                    < sizeof(public_clients)) {
 358                                         strcat(public_clients, addrbuf);
 359                                 }
 360                         }
 361                 }
 362                 fclose(fp);
 363                 pc_timestamp = time(NULL);
 364                 end_critical_section(S_PUBLIC_CLIENTS);
 365         }
 366
 367         lprintf(CTDL_DEBUG, "Checking whether %s is a local or public client\n",
 368                 CC->cs_addr);
 369         for (i=0; i<num_parms(public_clients); ++i) {
 370                 extract_token(addrbuf, public_clients, i, '|', sizeof addrbuf);
 371                 if (!strcasecmp(CC->cs_addr, addrbuf)) {
 372                         lprintf(CTDL_DEBUG, "... yes it is.\n");
 373                         return(1);
 374                 }
 375         }
 376
 377         /* No hits.  This is not a public client. */
 378         lprintf(CTDL_DEBUG, "... no it isn't.\n");
 379         return(0);
 380 }
 381
 382
 383 /*
 384  * the client is identifying itself to the server
 385  */
 386 void cmd_iden(char *argbuf)
 387 {
 388         int dev_code;
 389         int cli_code;
 390         int rev_level;
 391         char desc[128];
 392         char from_host[128];
 393         struct in_addr addr;
 394         int do_lookup = 0;
 395
 396         if (num_parms(argbuf)<4) {
 397                 cprintf("%d usage error\n", ERROR + ILLEGAL_VALUE);
 398                 return;
 399         }
 400
 401         dev_code = extract_int(argbuf,0);
 402         cli_code = extract_int(argbuf,1);
 403         rev_level = extract_int(argbuf,2);
 404         extract_token(desc, argbuf, 3, '|', sizeof desc);
 405
 406         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 407         from_host[sizeof from_host - 1] = 0;
 408         if (num_parms(argbuf)>=5) extract_token(from_host, argbuf, 4, '|', sizeof from_host);
 409
 410         CC->cs_clientdev = dev_code;
 411         CC->cs_clienttyp = cli_code;
 412         CC->cs_clientver = rev_level;
 413         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 414         CC->cs_clientname[31] = 0;
 415
 416         if (strlen(from_host) > 0) {
 417                 if (CC->is_local_socket) do_lookup = 1;
 418                 else if (is_public_client()) do_lookup = 1;
 419         }
 420
 421         if (do_lookup) {
 422                 lprintf(CTDL_DEBUG, "Looking up hostname '%s'\n", from_host);
 423                 if ((addr.s_addr = inet_addr(from_host)) != -1) {
 424                         locate_host(CC->cs_host, sizeof CC->cs_host,
 425                                 NULL, 0,
 426                                 &addr);
 427                 }
 428                 else {
 429                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 430                         CC->cs_host[sizeof CC->cs_host - 1] = 0;
 431                 }
 432         }
 433
 434         lprintf(CTDL_NOTICE, "Client %d/%d/%01d.%02d (%s) from %s\n",
 435                 dev_code,
 436                 cli_code,
 437                 (rev_level / 100),
 438                 (rev_level % 100),
 439                 desc,
 440                 CC->cs_host);
 441         cprintf("%d Ok\n",CIT_OK);
 442 }
 443
 444
 445 /*
 446  * display system messages or help
 447  */
 448 void cmd_mesg(char *mname)
 449 {
 450         FILE *mfp;
 451         char targ[256];
 452         char buf[256];
 453         char buf2[256];
 454         char *dirs[2];
 455
 456         extract_token(buf, mname, 0, '|', sizeof buf);
 457
 458         dirs[0] = strdup(
 459 #ifdef HAVE_DATA_DIR
 460                                          DATA_DIR"/"
 461 #endif
 462                                          "messages");
 463         dirs[1] = strdup(
 464 #ifdef HAVE_DATA_DIR
 465                                          DATA_DIR"/"
 466 #endif
 467                                          "help");
 468         snprintf(buf2, sizeof buf2, "%s.%d.%d", buf, CC->cs_clientdev, CC->cs_clienttyp);
 469         mesg_locate(targ, sizeof targ, buf2, 2, (const char **)dirs);
 470         if (strlen(targ) == 0) {
 471                 snprintf(buf2, sizeof buf2, "%s.%d", buf, CC->cs_clientdev);
 472                 mesg_locate(targ, sizeof targ, buf2, 2, (const char **)dirs);
 473                 if (strlen(targ) == 0) {
 474                         mesg_locate(targ, sizeof targ, buf, 2, (const char **)dirs);
 475                 }
 476         }
 477         free(dirs[0]);
 478         free(dirs[1]);
 479
 480         if (strlen(targ)==0) {
 481                 cprintf("%d '%s' not found.\n",ERROR + FILE_NOT_FOUND, mname);
 482                 return;
 483         }
 484
 485         mfp = fopen(targ,"r");
 486         if (mfp==NULL) {
 487                 cprintf("%d Cannot open '%s': %s\n",
 488                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
 489                 return;
 490         }
 491         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
 492
 493         while (fgets(buf, (sizeof buf - 1), mfp) != NULL) {
 494                 buf[strlen(buf)-1] = 0;
 495                 do_help_subst(buf);
 496                 cprintf("%s\n",buf);
 497         }
 498
 499         fclose(mfp);
 500         cprintf("000\n");
 501 }
 502
 503
 504 /*
 505  * enter system messages or help
 506  */
 507 void cmd_emsg(char *mname)
 508 {
 509         FILE *mfp;
 510         char targ[256];
 511         char buf[256];
 512         char *dirs[2];
 513         int a;
 514
 515         unbuffer_output();
 516
 517         if (CtdlAccessCheck(ac_aide)) return;
 518
 519         extract_token(buf, mname, 0, '|', sizeof buf);
 520         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 521                 if (buf[a] == '/') buf[a] = '.';
 522         }
 523
 524         dirs[0] = strdup(
 525 #ifdef HAVE_DATA_DIR
 526                                          DATA_DIR"/"
 527 #endif
 528                                          "messages");
 529         dirs[1] = strdup(
 530 #ifdef HAVE_DATA_DIR
 531                                          DATA_DIR"/"
 532 #endif
 533                                          "help");
 534         mesg_locate(targ, sizeof targ, buf, 2, (const char**)dirs);
 535         free(dirs[0]);
 536         free(dirs[1]);
 537
 538         if (strlen(targ)==0) {
 539                 snprintf(targ, sizeof targ,
 540 #ifndef HAVE_DATA_DIR
 541                          "."
 542 #else
 543                          DATA_DIR
 544 #endif
 545                                  "/help/%s", buf);
 546         }
 547
 548         mfp = fopen(targ,"w");
 549         if (mfp==NULL) {
 550                 cprintf("%d Cannot open '%s': %s\n",
 551                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
 552                 return;
 553         }
 554         cprintf("%d %s\n", SEND_LISTING, targ);
 555
 556         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 557                 fprintf(mfp, "%s\n", buf);
 558         }
 559
 560         fclose(mfp);
 561 }
 562
 563
 564 /* Don't show the names of private rooms unless the viewing
 565  * user also knows the rooms.
 566  */
 567 void GenerateRoomDisplay(char *real_room,
 568                         struct CitContext *viewed,
 569                         struct CitContext *viewer) {
 570
 571         int ra;
 572
 573         strcpy(real_room, viewed->room.QRname);
 574         if (viewed->room.QRflags & QR_MAILBOX) {
 575                 strcpy(real_room, &real_room[11]);
 576         }
 577         if (viewed->room.QRflags & QR_PRIVATE) {
 578                 CtdlRoomAccess(&viewed->room, &viewer->user, &ra, NULL);
 579                 if ( (ra & UA_KNOWN) == 0) {
 580                         strcpy(real_room, "<private room>");
 581                 }
 582         }
 583
 584         if (viewed->cs_flags & CS_CHAT) {
 585                 while (strlen(real_room) < 14)
 586                         strcat(real_room, " ");
 587
 588                 strcpy(&real_room[14], "<chat>");
 589         }
 590
 591 }
 592
 593 /*
 594  * Convenience function.
 595  */
 596 int CtdlAccessCheck(int required_level) {
 597
 598         if (CC->internal_pgm) return(0);
 599         if (required_level >= ac_internal) {
 600                 cprintf("%d This is not a user-level command.\n",
 601                         ERROR + HIGHER_ACCESS_REQUIRED);
 602                 return(-1);
 603         }
 604
 605         if ((required_level >= ac_logged_in) && (CC->logged_in == 0)) {
 606                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 607                 return(-1);
 608         }
 609
 610         if (CC->user.axlevel >= 6) return(0);
 611         if (required_level >= ac_aide) {
 612                 cprintf("%d This command requires Aide access.\n",
 613                         ERROR + HIGHER_ACCESS_REQUIRED);
 614                 return(-1);
 615         }
 616
 617         if (is_room_aide()) return(0);
 618         if (required_level >= ac_room_aide) {
 619                 cprintf("%d This command requires Aide or Room Aide access.\n",
 620                         ERROR + HIGHER_ACCESS_REQUIRED);
 621                 return(-1);
 622         }
 623
 624         /* shhh ... succeed quietly */
 625         return(0);
 626 }
 627
 628
 629
 630 /*
 631  * Terminate another running session
 632  */
 633 void cmd_term(char *cmdbuf)
 634 {
 635         int session_num;
 636         struct CitContext *ccptr;
 637         int found_it = 0;
 638         int allowed = 0;
 639
 640         session_num = extract_int(cmdbuf, 0);
 641         if (session_num == CC->cs_pid) {
 642                 cprintf("%d You can't kill your own session.\n", ERROR + ILLEGAL_VALUE);
 643                 return;
 644         }
 645
 646         lprintf(CTDL_DEBUG, "Locating session to kill\n");
 647         begin_critical_section(S_SESSION_TABLE);
 648         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 649                 if (session_num == ccptr->cs_pid) {
 650                         found_it = 1;
 651                         if ((ccptr->user.usernum == CC->user.usernum)
 652                            || (CC->user.axlevel >= 6)) {
 653                                 allowed = 1;
 654                                 ccptr->kill_me = 1;
 655                         }
 656                         else {
 657                                 allowed = 0;
 658                         }
 659                 }
 660         }
 661         end_critical_section(S_SESSION_TABLE);
 662
 663         if (found_it) {
 664                 if (allowed) {
 665                         cprintf("%d Session terminated.\n", CIT_OK);
 666                 }
 667                 else {
 668                         cprintf("%d You are not allowed to do that.\n",
 669                                 ERROR + HIGHER_ACCESS_REQUIRED);
 670                 }
 671         }
 672         else {
 673                 cprintf("%d No such session.\n", ERROR + ILLEGAL_VALUE);
 674         }
 675 }
 676
 677
 678
 679
 680
 681 /*
 682  * get the paginator prompt
 683  */
 684 void cmd_more(void) {
 685         cprintf("%d %s\n", CIT_OK, config.c_moreprompt);
 686 }
 687
 688 /*
 689  * echo
 690  */
 691 void cmd_echo(char *etext)
 692 {
 693         cprintf("%d %s\n", CIT_OK, etext);
 694 }
 695
 696
 697
 698 /*
 699  * identify as internal program
 700  */
 701 void cmd_ipgm(char *argbuf)
 702 {
 703         int secret;
 704
 705         secret = extract_int(argbuf, 0);
 706
 707         /* For security reasons, we do NOT allow this command to run
 708          * over the network.  Local sockets only.
 709          */
 710         if (!CC->is_local_socket) {
 711                 sleep(5);
 712                 cprintf("%d Authentication failed.\n",
 713                         ERROR + PASSWORD_REQUIRED);
 714         }
 715         else if (secret == config.c_ipgm_secret) {
 716                 CC->internal_pgm = 1;
 717                 strcpy(CC->curr_user, "<internal program>");
 718                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 719                 cprintf("%d Authenticated as an internal program.\n", CIT_OK);
 720         }
 721         else {
 722                 sleep(5);
 723                 cprintf("%d Authentication failed.\n",
 724                         ERROR + PASSWORD_REQUIRED);
 725                 lprintf(CTDL_ERR, "Warning: ipgm authentication failed.\n");
 726                 CC->kill_me = 1;
 727         }
 728
 729         /* Now change the ipgm secret for the next round.
 730          * (Disabled because it breaks concurrent scripts.  The fact that
 731          * we no longer accept IPGM over the network should be sufficient
 732          * to prevent brute-force attacks.  If you don't agree, uncomment
 733          * this block.)
 734         get_config();
 735         config.c_ipgm_secret = rand();
 736         put_config();
 737         */
 738 }
 739
 740
 741 /*
 742  * Shut down the server
 743  */
 744 void cmd_down(void) {
 745
 746         if (CtdlAccessCheck(ac_aide)) return;
 747
 748         cprintf("%d Shutting down server.  Goodbye.\n", CIT_OK);
 749         time_to_die = 1;
 750 }
 751
 752 /*
 753  * Schedule or cancel a server shutdown
 754  */
 755 void cmd_scdn(char *argbuf)
 756 {
 757         int new_state;
 758
 759         if (CtdlAccessCheck(ac_aide)) return;
 760
 761         new_state = extract_int(argbuf, 0);
 762         if ((new_state == 0) || (new_state == 1)) {
 763                 ScheduledShutdown = new_state;
 764         }
 765         cprintf("%d %d\n", CIT_OK, ScheduledShutdown);
 766 }
 767
 768
 769 /*
 770  * Set or unset asynchronous protocol mode
 771  */
 772 void cmd_asyn(char *argbuf)
 773 {
 774         int new_state;
 775
 776         new_state = extract_int(argbuf, 0);
 777         if ((new_state == 0) || (new_state == 1)) {
 778                 CC->is_async = new_state;
 779         }
 780         cprintf("%d %d\n", CIT_OK, CC->is_async);
 781 }
 782
 783
 784 /*
 785  * Generate a "nonce" for APOP-style authentication.
 786  *
 787  * RFC 1725 et al specify a PID to be placed in front of the nonce.
 788  * Quoth BTX: That would be stupid.
 789  */
 790 void generate_nonce(struct CitContext *con) {
 791         struct timeval tv;
 792
 793         memset(con->cs_nonce, NONCE_SIZE, 0);
 794         gettimeofday(&tv, NULL);
 795         memset(con->cs_nonce, NONCE_SIZE, 0);
 796         snprintf(con->cs_nonce, NONCE_SIZE, "<%d%ld@%s>",
 797                 rand(), (long)tv.tv_usec, config.c_fqdn);
 798 }
 799
 800
 801
 802
 803 /*
 804  * Back-end function for starting a session
 805  */
 806 void begin_session(struct CitContext *con)
 807 {
 808         int len;
 809         struct sockaddr_in sin;
 810
 811         /*
 812          * Initialize some variables specific to our context.
 813          */
 814         con->logged_in = 0;
 815         con->internal_pgm = 0;
 816         con->download_fp = NULL;
 817         con->upload_fp = NULL;
 818         con->FirstExpressMessage = NULL;
 819         time(&con->lastcmd);
 820         time(&con->lastidle);
 821         strcpy(con->lastcmdname, "    ");
 822         strcpy(con->cs_clientname, "(unknown)");
 823         strcpy(con->curr_user, NLI);
 824         strcpy(con->net_node, "");
 825         strcpy(con->fake_username, "");
 826         strcpy(con->fake_postname, "");
 827         strcpy(con->fake_hostname, "");
 828         strcpy(con->fake_roomname, "");
 829         generate_nonce(con);
 830         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 831         safestrncpy(con->cs_addr, "", sizeof con->cs_addr);
 832         con->cs_host[sizeof con->cs_host - 1] = 0;
 833         len = sizeof sin;
 834         if (!CC->is_local_socket) {
 835                 if (!getpeername(con->client_socket,
 836                    (struct sockaddr *) &sin, &len))     /* should be socklen_t but doesn't work on Macintosh */
 837                         locate_host(con->cs_host, sizeof con->cs_host,
 838                                 con->cs_addr, sizeof con->cs_addr,
 839                                 &sin.sin_addr);
 840         }
 841         else {
 842                 strcpy(con->cs_host, "");
 843         }
 844         con->cs_flags = 0;
 845         con->upload_type = UPL_FILE;
 846         con->dl_is_net = 0;
 847
 848         con->nologin = 0;
 849         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 850                 con->nologin = 1;
 851
 852         lprintf(CTDL_NOTICE, "Session started.\n");
 853
 854         /* Run any session startup routines registered by loadable modules */
 855         PerformSessionHooks(EVT_START);
 856 }
 857
 858
 859 void citproto_begin_session() {
 860         if (CC->nologin==1) {
 861                 cprintf("%d %s: Too many users are already online "
 862                         "(maximum is %d)\n",
 863                         ERROR + MAX_SESSIONS_EXCEEDED,
 864                         config.c_nodename, config.c_maxsessions);
 865         }
 866         else {
 867                 cprintf("%d %s Citadel server ready.\n",
 868                         CIT_OK, config.c_nodename);
 869         }
 870 }
 871
 872
 873
 874
 875 /*
 876  * This loop recognizes all server commands.
 877  */
 878 void do_command_loop(void) {
 879         char cmdbuf[1024];
 880
 881         time(&CC->lastcmd);
 882         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 883         if (client_getln(cmdbuf, sizeof cmdbuf) < 1) {
 884                 lprintf(CTDL_ERR, "Client socket is broken; ending session\n");
 885                 CC->kill_me = 1;
 886                 return;
 887         }
 888
 889         /* Log the server command, but don't show passwords... */
 890         if ( (strncasecmp(cmdbuf, "PASS", 4))
 891            && (strncasecmp(cmdbuf, "SETP", 4)) ) {
 892                 lprintf(CTDL_INFO, "%s\n", cmdbuf);
 893         }
 894         else {
 895                 lprintf(CTDL_INFO, "<password command sent>\n");
 896         }
 897
 898         buffer_output();
 899
 900         /*
 901          * Let other clients see the last command we executed, and
 902          * update the idle time, but not NOOP, QNOP, PEXP, or GEXP.
 903          */
 904         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 905            && (strncasecmp(cmdbuf, "QNOP", 4))
 906            && (strncasecmp(cmdbuf, "PEXP", 4))
 907            && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
 908                 strcpy(CC->lastcmdname, "    ");
 909                 safestrncpy(CC->lastcmdname, cmdbuf, sizeof(CC->lastcmdname));
 910                 time(&CC->lastidle);
 911         }
 912
 913         if ((strncasecmp(cmdbuf, "ENT0", 4))
 914            && (strncasecmp(cmdbuf, "MESG", 4))
 915            && (strncasecmp(cmdbuf, "MSGS", 4)))
 916         {
 917            CC->cs_flags &= ~CS_POSTING;
 918         }
 919
 920         if (!strncasecmp(cmdbuf, "NOOP", 4)) {
 921                 cprintf("%d%cok\n", CIT_OK, CtdlCheckExpress() );
 922         }
 923
 924         else if (!strncasecmp(cmdbuf, "QNOP", 4)) {
 925                 /* do nothing, this command returns no response */
 926         }
 927
 928         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 929                 cprintf("%d Goodbye.\n", CIT_OK);
 930                 CC->kill_me = 1;
 931         }
 932
 933         else if (!strncasecmp(cmdbuf,"ASYN",4)) {
 934                 cmd_asyn(&cmdbuf[5]);
 935         }
 936
 937         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 938                 if (CC->logged_in) logout(CC);
 939                 cprintf("%d logged out.\n", CIT_OK);
 940         }
 941
 942         else if (!strncasecmp(cmdbuf,"USER",4)) {
 943                 cmd_user(&cmdbuf[5]);
 944         }
 945
 946         else if (!strncasecmp(cmdbuf,"PASS",4)) {
 947                 cmd_pass(&cmdbuf[5]);
 948         }
 949
 950         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 951                 cmd_newu(&cmdbuf[5]);
 952         }
 953
 954         else if (!strncasecmp(cmdbuf,"CREU",4)) {
 955                 cmd_creu(&cmdbuf[5]);
 956         }
 957
 958         else if (!strncasecmp(cmdbuf,"SETP",4)) {
 959                 cmd_setp(&cmdbuf[5]);
 960         }
 961
 962         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 963                 cmd_lrms(&cmdbuf[5]);
 964         }
 965
 966         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
 967                 cmd_lkra(&cmdbuf[5]);
 968         }
 969
 970         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
 971                 cmd_lkrn(&cmdbuf[5]);
 972         }
 973
 974         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
 975                 cmd_lkro(&cmdbuf[5]);
 976         }
 977
 978         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
 979                 cmd_lzrm(&cmdbuf[5]);
 980         }
 981
 982         else if (!strncasecmp(cmdbuf,"LPRM",4)) {
 983                 cmd_lprm(&cmdbuf[5]);
 984         }
 985
 986         else if (!strncasecmp(cmdbuf,"GETU",4)) {
 987                 cmd_getu();
 988         }
 989
 990         else if (!strncasecmp(cmdbuf,"SETU",4)) {
 991                 cmd_setu(&cmdbuf[5]);
 992         }
 993
 994         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
 995                 cmd_goto(&cmdbuf[5]);
 996         }
 997
 998         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
 999                 cmd_msgs(&cmdbuf[5]);
1000         }
1001
1002         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
1003                 cmd_whok();
1004         }
1005
1006         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
1007                 cmd_rdir();
1008         }
1009
1010         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
1011                 cmd_msg0(&cmdbuf[5]);
1012         }
1013
1014         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
1015                 cmd_msg2(&cmdbuf[5]);
1016         }
1017
1018         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
1019                 cmd_msg3(&cmdbuf[5]);
1020         }
1021
1022         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
1023                 cmd_msg4(&cmdbuf[5]);
1024         }
1025
1026         else if (!strncasecmp(cmdbuf,"MSGP",4)) {
1027                 cmd_msgp(&cmdbuf[5]);
1028         }
1029
1030         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
1031                 cmd_opna(&cmdbuf[5]);
1032         }
1033
1034         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1035                 cmd_info();
1036         }
1037
1038         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1039                 cmd_slrp(&cmdbuf[5]);
1040         }
1041
1042         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1043                 cmd_invt_kick(&cmdbuf[5],1);
1044         }
1045
1046         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1047                 cmd_invt_kick(&cmdbuf[5],0);
1048         }
1049
1050         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1051                 cmd_getr();
1052         }
1053
1054         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1055                 cmd_setr(&cmdbuf[5]);
1056         }
1057
1058         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1059                 cmd_geta();
1060         }
1061
1062         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1063                 cmd_seta(&cmdbuf[5]);
1064         }
1065
1066         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1067                 cmd_ent0(&cmdbuf[5]);
1068         }
1069
1070         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1071                 cmd_rinf();
1072         }
1073
1074         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1075                 cmd_dele(&cmdbuf[5]);
1076         }
1077
1078         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1079                 cmd_kill(&cmdbuf[5]);
1080         }
1081
1082         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1083                 cmd_cre8(&cmdbuf[5]);
1084         }
1085
1086         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1087                 cmd_move(&cmdbuf[5]);
1088         }
1089
1090         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1091                 cmd_forg();
1092         }
1093
1094         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1095                 cmd_mesg(&cmdbuf[5]);
1096         }
1097
1098         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1099                 cmd_emsg(&cmdbuf[5]);
1100         }
1101
1102         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1103                 cmd_gnur();
1104         }
1105
1106         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1107                 cmd_vali(&cmdbuf[5]);
1108         }
1109
1110         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1111                 cmd_einf(&cmdbuf[5]);
1112         }
1113
1114         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1115                 cmd_list(&cmdbuf[5]);
1116         }
1117
1118         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1119                 cmd_chek();
1120         }
1121
1122         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1123                 cmd_delf(&cmdbuf[5]);
1124         }
1125
1126         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1127                 cmd_movf(&cmdbuf[5]);
1128         }
1129
1130         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1131                 cmd_netf(&cmdbuf[5]);
1132         }
1133
1134         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1135                 cmd_open(&cmdbuf[5]);
1136         }
1137
1138         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1139                 cmd_clos();
1140         }
1141
1142         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1143                 cmd_uopn(&cmdbuf[5]);
1144         }
1145
1146         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1147                 cmd_ucls(&cmdbuf[5]);
1148         }
1149
1150         else if (!strncasecmp(cmdbuf,"READ",4)) {
1151                 cmd_read(&cmdbuf[5]);
1152         }
1153
1154         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1155                 cmd_writ(&cmdbuf[5]);
1156         }
1157
1158         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1159                 cmd_qusr(&cmdbuf[5]);
1160         }
1161
1162         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1163                 cmd_echo(&cmdbuf[5]);
1164         }
1165
1166         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1167                 cmd_oimg(&cmdbuf[5]);
1168         }
1169
1170         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1171                 cmd_more();
1172         }
1173
1174         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1175                 cmd_ndop(&cmdbuf[5]);
1176         }
1177
1178         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1179                 cmd_nuop(&cmdbuf[5]);
1180         }
1181
1182         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1183                 cmd_lflr();
1184         }
1185
1186         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1187                 cmd_cflr(&cmdbuf[5]);
1188         }
1189
1190         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1191                 cmd_kflr(&cmdbuf[5]);
1192         }
1193
1194         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1195                 cmd_eflr(&cmdbuf[5]);
1196         }
1197
1198         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1199                 cmd_iden(&cmdbuf[5]);
1200         }
1201
1202         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1203                 cmd_ipgm(&cmdbuf[5]);
1204         }
1205
1206         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1207                 cmd_term(&cmdbuf[5]);
1208         }
1209
1210         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1211                 cmd_down();
1212         }
1213
1214         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1215                 cmd_scdn(&cmdbuf[5]);
1216         }
1217
1218         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1219                 cmd_uimg(&cmdbuf[5]);
1220         }
1221
1222         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1223                 cmd_time();
1224         }
1225
1226         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1227                 cmd_agup(&cmdbuf[5]);
1228         }
1229
1230         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1231                 cmd_asup(&cmdbuf[5]);
1232         }
1233
1234         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1235                 cmd_gpex(&cmdbuf[5]);
1236         }
1237
1238         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1239                 cmd_spex(&cmdbuf[5]);
1240         }
1241
1242         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1243                 cmd_conf(&cmdbuf[5]);
1244         }
1245
1246         else if (!strncasecmp(cmdbuf, "SEEN", 4)) {
1247                 cmd_seen(&cmdbuf[5]);
1248         }
1249
1250         else if (!strncasecmp(cmdbuf, "GTSN", 4)) {
1251                 cmd_gtsn(&cmdbuf[5]);
1252         }
1253
1254         else if (!strncasecmp(cmdbuf, "VIEW", 4)) {
1255                 cmd_view(&cmdbuf[5]);
1256         }
1257
1258         else if (!strncasecmp(cmdbuf, "ISME", 4)) {
1259                 cmd_isme(&cmdbuf[5]);
1260         }
1261
1262         else if (!DLoader_Exec_Cmd(cmdbuf)) {
1263                 cprintf("%d Unrecognized or unsupported command.\n",
1264                         ERROR + CMD_NOT_SUPPORTED);
1265                }
1266
1267         unbuffer_output();
1268
1269         /* Run any after-each-command routines registered by modules */
1270         PerformSessionHooks(EVT_CMD);
1271 }
1272
1273
1274 /*
1275  * This loop performs all asynchronous functions.
1276  */
1277 void do_async_loop(void) {
1278         PerformSessionHooks(EVT_ASYNC);
1279 }