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