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 "serv_extensions.h"
  42 #include "sysdep_decls.h"
  43 #include "citserver.h"
  44 #include "config.h"
  45 #include "database.h"
  46 #include "housekeeping.h"
  47 #include "user_ops.h"
  48 #include "msgbase.h"
  49 #include "support.h"
  50 #include "locate_host.h"
  51 #include "room_ops.h"
  52 #include "file_ops.h"
  53 #include "policy.h"
  54 #include "control.h"
  55 #include "tools.h"
  56 #include "euidindex.h"
  57
  58 #ifndef HAVE_SNPRINTF
  59 #include "snprintf.h"
  60 #endif
  61
  62 struct CitContext *ContextList = NULL;
  63 struct CitContext* next_session = NULL;
  64 char *unique_session_numbers;
  65 int ScheduledShutdown = 0;
  66 int do_defrag = 0;
  67 time_t server_startup_time;
  68
  69 /*
  70  * Various things that need to be initialized at startup
  71  */
  72 void master_startup(void) {
  73         struct timeval tv;
  74         unsigned int seed;
  75         FILE *urandom;
  76         struct ctdlroom qrbuf;
  77
  78         lprintf(CTDL_DEBUG, "master_startup() started\n");
  79         time(&server_startup_time);
  80
  81         lprintf(CTDL_INFO, "Opening databases\n");
  82         open_databases();
  83
  84         if (do_defrag) {
  85                 defrag_databases();
  86         }
  87
  88         check_ref_counts();
  89
  90         lprintf(CTDL_INFO, "Creating base rooms (if necessary)\n");
  91         create_room(config.c_baseroom,  0, "", 0, 1, 0, VIEW_BBS);
  92         create_room(AIDEROOM,           3, "", 0, 1, 0, VIEW_BBS);
  93         create_room(SYSCONFIGROOM,      3, "", 0, 1, 0, VIEW_BBS);
  94         create_room(config.c_twitroom,  0, "", 0, 1, 0, VIEW_BBS);
  95
  96         /* The "Local System Configuration" room doesn't need to be visible */
  97         if (lgetroom(&qrbuf, SYSCONFIGROOM) == 0) {
  98                 qrbuf.QRflags2 |= QR2_SYSTEM;
  99                 lputroom(&qrbuf);
 100         }
 101
 102         lprintf(CTDL_INFO, "Seeding the pseudo-random number generator...\n");
 103         urandom = fopen("/dev/urandom", "r");
 104         if (urandom != NULL) {
 105                 fread(&seed, sizeof seed, 1, urandom);
 106                 fclose(urandom);
 107         }
 108         else {
 109                 gettimeofday(&tv, NULL);
 110                 seed = tv.tv_usec;
 111         }
 112         srandom(seed);
 113
 114         lprintf(CTDL_INFO, "Initializing ipgm secret\n");
 115         get_config();
 116         config.c_ipgm_secret = rand();
 117         put_config();
 118
 119         lprintf(CTDL_DEBUG, "master_startup() finished\n");
 120 }
 121
 122
 123 /*
 124  * Cleanup routine to be called when the server is shutting down.
 125  */
 126 void master_cleanup(int exitcode) {
 127         struct CleanupFunctionHook *fcn;
 128         static int already_cleaning_up = 0;
 129
 130         if (already_cleaning_up) while(1) sleep(1);
 131         already_cleaning_up = 1;
 132
 133         /* Run any cleanup routines registered by loadable modules */
 134         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
 135                 (*fcn->h_function_pointer)();
 136         }
 137
 138         /* Close the AdjRefCount queue file */
 139         AdjRefCount(-1, 0);
 140
 141         /* Shut down the indexer thread */
 142         lprintf(CTDL_INFO, "Waiting for the indexer thread to shut down\n");
 143         pthread_join(indexer_thread_tid, NULL);
 144
 145         /* Shut down the checkpoint thread */
 146         lprintf(CTDL_INFO, "Waiting for the checkpoint thread to shut down\n");
 147         pthread_join(checkpoint_thread_tid, NULL);
 148
 149         /* Close databases */
 150         lprintf(CTDL_INFO, "Closing databases\n");
 151         close_databases();
 152
 153         /* Do system-dependent stuff */
 154         sysdep_master_cleanup();
 155
 156 #ifdef DEBUG_MEMORY_LEAKS
 157         dump_heap();
 158 #endif
 159
 160         /* If the operator requested a halt but not an exit, halt here. */
 161         if (shutdown_and_halt) {
 162                 lprintf(CTDL_NOTICE, "citserver: Halting server without exiting.\n");
 163                 fflush(stdout); fflush(stderr);
 164                 while(1) {
 165                         sleep(32767);
 166                 }
 167         }
 168
 169         /* Now go away. */
 170         lprintf(CTDL_NOTICE, "citserver: Exiting with status %d\n", exitcode);
 171         fflush(stdout); fflush(stderr);
 172
 173         exit(exitcode);
 174 }
 175
 176
 177
 178 /*
 179  * Terminate a session.
 180  */
 181 void RemoveContext (struct CitContext *con)
 182 {
 183         if (con==NULL) {
 184                 lprintf(CTDL_ERR,
 185                         "WARNING: RemoveContext() called with NULL!\n");
 186                 return;
 187         }
 188         lprintf(CTDL_DEBUG, "RemoveContext() session %d\n", con->cs_pid);
 189
 190         /* Run any cleanup routines registered by loadable modules.
 191          * Note: We have to "become_session()" because the cleanup functions
 192          *       might make references to "CC" assuming it's the right one.
 193          */
 194         become_session(con);
 195         PerformSessionHooks(EVT_STOP);
 196         become_session(NULL);
 197
 198         /* Now handle all of the administrivia. */
 199         lprintf(CTDL_DEBUG, "Calling logout(%d)\n", con->cs_pid);
 200         logout(con);
 201
 202         lprintf(CTDL_NOTICE, "[%3d] Session ended.\n", con->cs_pid);
 203
 204         /* If the client is still connected, blow 'em away. */
 205         lprintf(CTDL_DEBUG, "Closing socket %d\n", con->client_socket);
 206         close(con->client_socket);
 207
 208         lprintf(CTDL_DEBUG, "Done with RemoveContext()\n");
 209 }
 210
 211
 212
 213
 214
 215 /*
 216  * cmd_info()  -  tell the client about this server
 217  */
 218 void cmd_info(void) {
 219         cprintf("%d Server info:\n", LISTING_FOLLOWS);
 220         cprintf("%d\n", CC->cs_pid);
 221         cprintf("%s\n", config.c_nodename);
 222         cprintf("%s\n", config.c_humannode);
 223         cprintf("%s\n", config.c_fqdn);
 224         cprintf("%s\n", CITADEL);
 225         cprintf("%d\n", REV_LEVEL);
 226         cprintf("%s\n", config.c_site_location);
 227         cprintf("%s\n", config.c_sysadm);
 228         cprintf("%d\n", SERVER_TYPE);
 229         cprintf("%s\n", config.c_moreprompt);
 230         cprintf("1\n"); /* 1 = yes, this system supports floors */
 231         cprintf("1\n"); /* 1 = we support the extended paging options */
 232         cprintf("%s\n", CC->cs_nonce);
 233         cprintf("1\n"); /* 1 = yes, this system supports the QNOP command */
 234
 235 #ifdef HAVE_LDAP
 236         cprintf("1\n"); /* 1 = yes, this server is LDAP-enabled */
 237 #else
 238         cprintf("0\n"); /* 1 = no, this server is not LDAP-enabled */
 239 #endif
 240
 241         if (config.c_auth_mode == 1) {
 242                 cprintf("1\n"); /* "create new user" never works with host auth */
 243         }
 244         else {
 245                 cprintf("%d\n", config.c_disable_newu); /* otherwise, site defined */
 246         }
 247
 248         cprintf("%s\n", config.c_default_cal_zone);
 249
 250         cprintf("000\n");
 251 }
 252
 253
 254 /*
 255  * returns an asterisk if there are any instant messages waiting,
 256  * space otherwise.
 257  */
 258 char CtdlCheckExpress(void) {
 259         if (CC->FirstExpressMessage == NULL) {
 260                 return(' ');
 261         }
 262         else {
 263                 return('*');
 264         }
 265 }
 266
 267 void cmd_time(void)
 268 {
 269    time_t tv;
 270    struct tm tmp;
 271
 272    tv = time(NULL);
 273    localtime_r(&tv, &tmp);
 274
 275    /* timezone and daylight global variables are not portable. */
 276 #ifdef HAVE_STRUCT_TM_TM_GMTOFF
 277    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, tmp.tm_gmtoff, tmp.tm_isdst);
 278 #else
 279    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, timezone, tmp.tm_isdst);
 280 #endif
 281 }
 282
 283
 284 /*
 285  * Check originating host against the public_clients file.  This determines
 286  * whether the client is allowed to change the hostname for this session
 287  * (for example, to show the location of the user rather than the location
 288  * of the client).
 289  */
 290 int is_public_client(void)
 291 {
 292         char buf[1024];
 293         char addrbuf[1024];
 294         FILE *fp;
 295         int i;
 296         struct stat statbuf;
 297         static time_t pc_timestamp = 0;
 298         static char public_clients[SIZ];
 299         static char public_clients_file[SIZ];
 300
 301         snprintf(public_clients_file,
 302                          sizeof public_clients_file,
 303                          "%s/public_clients",
 304                          ctdl_etc_dir);
 305
 306         /*
 307          * Check the time stamp on the public_clients file.  If it's been
 308          * updated since the last time we were here (or if this is the first
 309          * time we've been through the loop), read its contents and learn
 310          * the IP addresses of the listed hosts.
 311          */
 312         if (stat(public_clients_file, &statbuf) != 0) {
 313                 /* No public_clients file exists, so bail out */
 314                 lprintf(CTDL_WARNING, "Warning: '%s' does not exist\n",
 315                                 public_clients_file);
 316                 return(0);
 317         }
 318
 319         if (statbuf.st_mtime > pc_timestamp) {
 320                 begin_critical_section(S_PUBLIC_CLIENTS);
 321                 lprintf(CTDL_INFO, "Loading %s\n", public_clients_file);
 322
 323                 safestrncpy(public_clients, "127.0.0.1", sizeof public_clients);
 324                 if (hostname_to_dotted_quad(addrbuf, config.c_fqdn) == 0) {
 325                         strcat(public_clients, "|");
 326                         strcat(public_clients, addrbuf);
 327                 }
 328
 329                 fp = fopen(public_clients_file, "r");
 330                 if (fp != NULL) while (fgets(buf, sizeof buf, fp)!=NULL) {
 331                         for (i=0; i<strlen(buf); ++i) {
 332                                 if (buf[i] == '#') buf[i] = 0;
 333                         }
 334                         while (isspace((buf[strlen(buf)-1]))) {
 335                                 buf[strlen(buf)-1] = 0;
 336                         }
 337                         if (hostname_to_dotted_quad(addrbuf, buf) == 0) {
 338                                 if ((strlen(public_clients) +
 339                                    strlen(addrbuf) + 2)
 340                                    < sizeof(public_clients)) {
 341                                         strcat(public_clients, "|");
 342                                         strcat(public_clients, addrbuf);
 343                                 }
 344                         }
 345                 }
 346                 fclose(fp);
 347                 pc_timestamp = time(NULL);
 348                 end_critical_section(S_PUBLIC_CLIENTS);
 349         }
 350
 351         lprintf(CTDL_DEBUG, "Checking whether %s is a local or public client\n",
 352                 CC->cs_addr);
 353         for (i=0; i<num_parms(public_clients); ++i) {
 354                 extract_token(addrbuf, public_clients, i, '|', sizeof addrbuf);
 355                 if (!strcasecmp(CC->cs_addr, addrbuf)) {
 356                         lprintf(CTDL_DEBUG, "... yes it is.\n");
 357                         return(1);
 358                 }
 359         }
 360
 361         /* No hits.  This is not a public client. */
 362         lprintf(CTDL_DEBUG, "... no it isn't.\n");
 363         return(0);
 364 }
 365
 366
 367 /*
 368  * the client is identifying itself to the server
 369  */
 370 void cmd_iden(char *argbuf)
 371 {
 372         int dev_code;
 373         int cli_code;
 374         int rev_level;
 375         char desc[128];
 376         char from_host[128];
 377         struct in_addr addr;
 378         int do_lookup = 0;
 379
 380         if (num_parms(argbuf)<4) {
 381                 cprintf("%d usage error\n", ERROR + ILLEGAL_VALUE);
 382                 return;
 383         }
 384
 385         dev_code = extract_int(argbuf,0);
 386         cli_code = extract_int(argbuf,1);
 387         rev_level = extract_int(argbuf,2);
 388         extract_token(desc, argbuf, 3, '|', sizeof desc);
 389
 390         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 391         from_host[sizeof from_host - 1] = 0;
 392         if (num_parms(argbuf)>=5) extract_token(from_host, argbuf, 4, '|', sizeof from_host);
 393
 394         CC->cs_clientdev = dev_code;
 395         CC->cs_clienttyp = cli_code;
 396         CC->cs_clientver = rev_level;
 397         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 398         CC->cs_clientname[31] = 0;
 399
 400         if (strlen(from_host) > 0) {
 401                 if (CC->is_local_socket) do_lookup = 1;
 402                 else if (is_public_client()) do_lookup = 1;
 403         }
 404
 405         if (do_lookup) {
 406                 lprintf(CTDL_DEBUG, "Looking up hostname '%s'\n", from_host);
 407                 if ((addr.s_addr = inet_addr(from_host)) != -1) {
 408                         locate_host(CC->cs_host, sizeof CC->cs_host,
 409                                 CC->cs_addr, sizeof CC->cs_addr,
 410                                 &addr);
 411                 }
 412                 else {
 413                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 414                         CC->cs_host[sizeof CC->cs_host - 1] = 0;
 415                 }
 416         }
 417
 418         lprintf(CTDL_NOTICE, "Client %d/%d/%01d.%02d (%s) from %s\n",
 419                 dev_code,
 420                 cli_code,
 421                 (rev_level / 100),
 422                 (rev_level % 100),
 423                 desc,
 424                 CC->cs_host);
 425         cprintf("%d Ok\n",CIT_OK);
 426 }
 427
 428
 429 /*
 430  * display system messages or help
 431  */
 432 void cmd_mesg(char *mname)
 433 {
 434         FILE *mfp;
 435         char targ[256];
 436         char buf[256];
 437         char buf2[256];
 438         char *dirs[2];
 439         DIR *dp;
 440         struct dirent *d;
 441
 442         extract_token(buf, mname, 0, '|', sizeof buf);
 443
 444         dirs[0] = strdup(ctdl_message_dir);
 445         dirs[1] = strdup(ctdl_hlp_dir);
 446
 447         snprintf(buf2, sizeof buf2, "%s.%d.%d",
 448                 buf, CC->cs_clientdev, CC->cs_clienttyp);
 449
 450         /* If the client requested "?" then produce a listing */
 451         if (!strcmp(buf, "?")) {
 452                 cprintf("%d %s\n", LISTING_FOLLOWS, buf);
 453                 dp = opendir(dirs[1]);
 454                 if (dp != NULL) {
 455                         while (d = readdir(dp), d != NULL) {
 456                                 if (d->d_name[0] != '.') {
 457                                         cprintf(" %s\n", d->d_name);
 458                                 }
 459                         }
 460                         closedir(dp);
 461                 }
 462                 cprintf("000\n");
 463                 free(dirs[0]);
 464                 free(dirs[1]);
 465                 return;
 466         }
 467
 468         /* Otherwise, look for the requested file by name. */
 469         else {
 470                 mesg_locate(targ, sizeof targ, buf2, 2, (const char **)dirs);
 471                 if (strlen(targ) == 0) {
 472                         snprintf(buf2, sizeof buf2, "%s.%d",
 473                                                         buf, CC->cs_clientdev);
 474                         mesg_locate(targ, sizeof targ, buf2, 2,
 475                                                         (const char **)dirs);
 476                         if (strlen(targ) == 0) {
 477                                 mesg_locate(targ, sizeof targ, buf, 2,
 478                                                         (const char **)dirs);
 479                         }
 480                 }
 481         }
 482
 483         free(dirs[0]);
 484         free(dirs[1]);
 485
 486         if (strlen(targ)==0) {
 487                 cprintf("%d '%s' not found.  (Searching in %s and %s)\n",
 488                         ERROR + FILE_NOT_FOUND,
 489                         mname,
 490                         ctdl_message_dir,
 491                         ctdl_hlp_dir
 492                 );
 493                 return;
 494         }
 495
 496         mfp = fopen(targ, "r");
 497         if (mfp==NULL) {
 498                 cprintf("%d Cannot open '%s': %s\n",
 499                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
 500                 return;
 501         }
 502         cprintf("%d %s\n", LISTING_FOLLOWS,buf);
 503
 504         while (fgets(buf, (sizeof buf - 1), mfp) != NULL) {
 505                 buf[strlen(buf)-1] = 0;
 506                 do_help_subst(buf);
 507                 cprintf("%s\n",buf);
 508         }
 509
 510         fclose(mfp);
 511         cprintf("000\n");
 512 }
 513
 514
 515 /*
 516  * enter system messages or help
 517  */
 518 void cmd_emsg(char *mname)
 519 {
 520         FILE *mfp;
 521         char targ[256];
 522         char buf[256];
 523         char *dirs[2];
 524         int a;
 525
 526         unbuffer_output();
 527
 528         if (CtdlAccessCheck(ac_aide)) return;
 529
 530         extract_token(buf, mname, 0, '|', sizeof buf);
 531         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 532                 if (buf[a] == '/') buf[a] = '.';
 533         }
 534
 535         dirs[0] = strdup(ctdl_message_dir);
 536         dirs[1] = strdup(ctdl_hlp_dir);
 537
 538         mesg_locate(targ, sizeof targ, buf, 2, (const char**)dirs);
 539         free(dirs[0]);
 540         free(dirs[1]);
 541
 542         if (strlen(targ)==0) {
 543                 snprintf(targ, sizeof targ,
 544                                  "%s/%s",
 545                                  ctdl_hlp_dir, 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  * Halt the server without exiting the server process.
 754  */
 755 void cmd_halt(void) {
 756
 757         if (CtdlAccessCheck(ac_aide)) return;
 758
 759         cprintf("%d Halting server.  Goodbye.\n", CIT_OK);
 760         time_to_die = 1;
 761         shutdown_and_halt = 1;
 762 }
 763
 764 /*
 765  * Schedule or cancel a server shutdown
 766  */
 767 void cmd_scdn(char *argbuf)
 768 {
 769         int new_state;
 770
 771         if (CtdlAccessCheck(ac_aide)) return;
 772
 773         new_state = extract_int(argbuf, 0);
 774         if ((new_state == 0) || (new_state == 1)) {
 775                 ScheduledShutdown = new_state;
 776         }
 777         cprintf("%d %d\n", CIT_OK, ScheduledShutdown);
 778 }
 779
 780
 781 /*
 782  * Set or unset asynchronous protocol mode
 783  */
 784 void cmd_asyn(char *argbuf)
 785 {
 786         int new_state;
 787
 788         new_state = extract_int(argbuf, 0);
 789         if ((new_state == 0) || (new_state == 1)) {
 790                 CC->is_async = new_state;
 791         }
 792         cprintf("%d %d\n", CIT_OK, CC->is_async);
 793 }
 794
 795
 796 /*
 797  * Generate a "nonce" for APOP-style authentication.
 798  *
 799  * RFC 1725 et al specify a PID to be placed in front of the nonce.
 800  * Quoth BTX: That would be stupid.
 801  */
 802 void generate_nonce(struct CitContext *con) {
 803         struct timeval tv;
 804
 805         memset(con->cs_nonce, NONCE_SIZE, 0);
 806         gettimeofday(&tv, NULL);
 807         memset(con->cs_nonce, NONCE_SIZE, 0);
 808         snprintf(con->cs_nonce, NONCE_SIZE, "<%d%ld@%s>",
 809                 rand(), (long)tv.tv_usec, config.c_fqdn);
 810 }
 811
 812
 813
 814
 815 /*
 816  * Back-end function for starting a session
 817  */
 818 void begin_session(struct CitContext *con)
 819 {
 820         socklen_t len;
 821         struct sockaddr_in sin;
 822
 823         /*
 824          * Initialize some variables specific to our context.
 825          */
 826         con->logged_in = 0;
 827         con->internal_pgm = 0;
 828         con->download_fp = NULL;
 829         con->upload_fp = NULL;
 830         con->FirstExpressMessage = NULL;
 831         time(&con->lastcmd);
 832         time(&con->lastidle);
 833         strcpy(con->lastcmdname, "    ");
 834         strcpy(con->cs_clientname, "(unknown)");
 835         strcpy(con->curr_user, NLI);
 836         strcpy(con->net_node, "");
 837         strcpy(con->fake_username, "");
 838         strcpy(con->fake_postname, "");
 839         strcpy(con->fake_hostname, "");
 840         strcpy(con->fake_roomname, "");
 841         generate_nonce(con);
 842         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 843         safestrncpy(con->cs_addr, "", sizeof con->cs_addr);
 844         con->cs_host[sizeof con->cs_host - 1] = 0;
 845         len = sizeof sin;
 846         if (!CC->is_local_socket) {
 847                 if (!getpeername(con->client_socket, (struct sockaddr *) &sin, &len)) {
 848                         locate_host(con->cs_host, sizeof con->cs_host,
 849                                 con->cs_addr, sizeof con->cs_addr,
 850                                 &sin.sin_addr
 851                         );
 852                 }
 853         }
 854         else {
 855                 strcpy(con->cs_host, "");
 856         }
 857         con->cs_flags = 0;
 858         con->upload_type = UPL_FILE;
 859         con->dl_is_net = 0;
 860
 861         con->nologin = 0;
 862         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 863                 con->nologin = 1;
 864
 865         lprintf(CTDL_NOTICE, "Session started.\n");
 866
 867         /* Run any session startup routines registered by loadable modules */
 868         PerformSessionHooks(EVT_START);
 869 }
 870
 871
 872 void citproto_begin_session() {
 873         if (CC->nologin==1) {
 874                 cprintf("%d %s: Too many users are already online "
 875                         "(maximum is %d)\n",
 876                         ERROR + MAX_SESSIONS_EXCEEDED,
 877                         config.c_nodename, config.c_maxsessions);
 878         }
 879         else {
 880                 cprintf("%d %s Citadel server ready.\n",
 881                         CIT_OK, config.c_nodename);
 882         }
 883 }
 884
 885
 886
 887
 888 /*
 889  * This loop recognizes all server commands.
 890  */
 891 void do_command_loop(void) {
 892         char cmdbuf[SIZ];
 893
 894         time(&CC->lastcmd);
 895         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 896         if (client_getln(cmdbuf, sizeof cmdbuf) < 1) {
 897                 lprintf(CTDL_ERR, "Client disconnected: ending session.\n");
 898                 CC->kill_me = 1;
 899                 return;
 900         }
 901
 902         /* Log the server command, but don't show passwords... */
 903         if ( (strncasecmp(cmdbuf, "PASS", 4))
 904            && (strncasecmp(cmdbuf, "SETP", 4)) ) {
 905                 lprintf(CTDL_INFO, "%s\n", cmdbuf);
 906         }
 907         else {
 908                 lprintf(CTDL_INFO, "<password command sent>\n");
 909         }
 910
 911         buffer_output();
 912
 913         /*
 914          * Let other clients see the last command we executed, and
 915          * update the idle time, but not NOOP, QNOP, PEXP, GEXP, RWHO, or TIME.
 916          */
 917         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 918            && (strncasecmp(cmdbuf, "QNOP", 4))
 919            && (strncasecmp(cmdbuf, "PEXP", 4))
 920            && (strncasecmp(cmdbuf, "GEXP", 4))
 921            && (strncasecmp(cmdbuf, "RWHO", 4))
 922            && (strncasecmp(cmdbuf, "TIME", 4)) ) {
 923                 strcpy(CC->lastcmdname, "    ");
 924                 safestrncpy(CC->lastcmdname, cmdbuf, sizeof(CC->lastcmdname));
 925                 time(&CC->lastidle);
 926         }
 927
 928         if ((strncasecmp(cmdbuf, "ENT0", 4))
 929            && (strncasecmp(cmdbuf, "MESG", 4))
 930            && (strncasecmp(cmdbuf, "MSGS", 4)))
 931         {
 932            CC->cs_flags &= ~CS_POSTING;
 933         }
 934
 935         if (!strncasecmp(cmdbuf, "NOOP", 4)) {
 936                 cprintf("%d%cok\n", CIT_OK, CtdlCheckExpress() );
 937         }
 938
 939         else if (!strncasecmp(cmdbuf, "QNOP", 4)) {
 940                 /* do nothing, this command returns no response */
 941         }
 942
 943         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 944                 cprintf("%d Goodbye.\n", CIT_OK);
 945                 CC->kill_me = 1;
 946         }
 947
 948         else if (!strncasecmp(cmdbuf,"ASYN",4)) {
 949                 cmd_asyn(&cmdbuf[5]);
 950         }
 951
 952         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 953                 if (CC->logged_in) logout(CC);
 954                 cprintf("%d logged out.\n", CIT_OK);
 955         }
 956
 957         else if (!strncasecmp(cmdbuf,"USER",4)) {
 958                 cmd_user(&cmdbuf[5]);
 959         }
 960
 961         else if (!strncasecmp(cmdbuf,"PASS",4)) {
 962                 cmd_pass(&cmdbuf[5]);
 963         }
 964
 965         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 966                 cmd_newu(&cmdbuf[5]);
 967         }
 968
 969         else if (!strncasecmp(cmdbuf,"CREU",4)) {
 970                 cmd_creu(&cmdbuf[5]);
 971         }
 972
 973         else if (!strncasecmp(cmdbuf,"SETP",4)) {
 974                 cmd_setp(&cmdbuf[5]);
 975         }
 976
 977         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 978                 cmd_lrms(&cmdbuf[5]);
 979         }
 980
 981         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
 982                 cmd_lkra(&cmdbuf[5]);
 983         }
 984
 985         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
 986                 cmd_lkrn(&cmdbuf[5]);
 987         }
 988
 989         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
 990                 cmd_lkro(&cmdbuf[5]);
 991         }
 992
 993         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
 994                 cmd_lzrm(&cmdbuf[5]);
 995         }
 996
 997         else if (!strncasecmp(cmdbuf,"LPRM",4)) {
 998                 cmd_lprm(&cmdbuf[5]);
 999         }
1000
1001         else if (!strncasecmp(cmdbuf,"GETU",4)) {
1002                 cmd_getu();
1003         }
1004
1005         else if (!strncasecmp(cmdbuf,"SETU",4)) {
1006                 cmd_setu(&cmdbuf[5]);
1007         }
1008
1009         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
1010                 cmd_goto(&cmdbuf[5]);
1011         }
1012
1013         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
1014                 cmd_msgs(&cmdbuf[5]);
1015         }
1016
1017         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
1018                 cmd_whok();
1019         }
1020
1021         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
1022                 cmd_rdir();
1023         }
1024
1025         else if (!strncasecmp(cmdbuf,"EUID",4)) {
1026                 cmd_euid(&cmdbuf[5]);
1027         }
1028
1029         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
1030                 cmd_msg0(&cmdbuf[5]);
1031         }
1032
1033         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
1034                 cmd_msg2(&cmdbuf[5]);
1035         }
1036
1037         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
1038                 cmd_msg3(&cmdbuf[5]);
1039         }
1040
1041         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
1042                 cmd_msg4(&cmdbuf[5]);
1043         }
1044
1045         else if (!strncasecmp(cmdbuf,"MSGP",4)) {
1046                 cmd_msgp(&cmdbuf[5]);
1047         }
1048
1049         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
1050                 cmd_opna(&cmdbuf[5]);
1051         }
1052
1053         else if (!strncasecmp(cmdbuf,"DLAT",4)) {
1054                 cmd_dlat(&cmdbuf[5]);
1055         }
1056
1057         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1058                 cmd_info();
1059         }
1060
1061         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1062                 cmd_slrp(&cmdbuf[5]);
1063         }
1064
1065         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1066                 cmd_invt_kick(&cmdbuf[5],1);
1067         }
1068
1069         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1070                 cmd_invt_kick(&cmdbuf[5],0);
1071         }
1072
1073         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1074                 cmd_getr();
1075         }
1076
1077         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1078                 cmd_setr(&cmdbuf[5]);
1079         }
1080
1081         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1082                 cmd_geta();
1083         }
1084
1085         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1086                 cmd_seta(&cmdbuf[5]);
1087         }
1088
1089         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1090                 cmd_ent0(&cmdbuf[5]);
1091         }
1092
1093         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1094                 cmd_rinf();
1095         }
1096
1097         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1098                 cmd_dele(&cmdbuf[5]);
1099         }
1100
1101         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1102                 cmd_kill(&cmdbuf[5]);
1103         }
1104
1105         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1106                 cmd_cre8(&cmdbuf[5]);
1107         }
1108
1109         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1110                 cmd_move(&cmdbuf[5]);
1111         }
1112
1113         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1114                 cmd_forg();
1115         }
1116
1117         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1118                 cmd_mesg(&cmdbuf[5]);
1119         }
1120
1121         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1122                 cmd_emsg(&cmdbuf[5]);
1123         }
1124
1125         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1126                 cmd_gnur();
1127         }
1128
1129         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1130                 cmd_vali(&cmdbuf[5]);
1131         }
1132
1133         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1134                 cmd_einf(&cmdbuf[5]);
1135         }
1136
1137         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1138                 cmd_list(&cmdbuf[5]);
1139         }
1140
1141         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1142                 cmd_chek();
1143         }
1144
1145         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1146                 cmd_delf(&cmdbuf[5]);
1147         }
1148
1149         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1150                 cmd_movf(&cmdbuf[5]);
1151         }
1152
1153         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1154                 cmd_netf(&cmdbuf[5]);
1155         }
1156
1157         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1158                 cmd_open(&cmdbuf[5]);
1159         }
1160
1161         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1162                 cmd_clos();
1163         }
1164
1165         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1166                 cmd_uopn(&cmdbuf[5]);
1167         }
1168
1169         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1170                 cmd_ucls(&cmdbuf[5]);
1171         }
1172
1173         else if (!strncasecmp(cmdbuf,"READ",4)) {
1174                 cmd_read(&cmdbuf[5]);
1175         }
1176
1177         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1178                 cmd_writ(&cmdbuf[5]);
1179         }
1180
1181         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1182                 cmd_qusr(&cmdbuf[5]);
1183         }
1184
1185         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1186                 cmd_echo(&cmdbuf[5]);
1187         }
1188
1189         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1190                 cmd_oimg(&cmdbuf[5]);
1191         }
1192
1193         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1194                 cmd_more();
1195         }
1196
1197         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1198                 cmd_ndop(&cmdbuf[5]);
1199         }
1200
1201         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1202                 cmd_nuop(&cmdbuf[5]);
1203         }
1204
1205         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1206                 cmd_lflr();
1207         }
1208
1209         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1210                 cmd_cflr(&cmdbuf[5]);
1211         }
1212
1213         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1214                 cmd_kflr(&cmdbuf[5]);
1215         }
1216
1217         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1218                 cmd_eflr(&cmdbuf[5]);
1219         }
1220
1221         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1222                 cmd_iden(&cmdbuf[5]);
1223         }
1224
1225         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1226                 cmd_ipgm(&cmdbuf[5]);
1227         }
1228
1229         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1230                 cmd_term(&cmdbuf[5]);
1231         }
1232
1233         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1234                 cmd_down();
1235         }
1236
1237         else if (!strncasecmp(cmdbuf,"HALT",4)) {
1238                 cmd_halt();
1239         }
1240
1241         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1242                 cmd_scdn(&cmdbuf[5]);
1243         }
1244
1245         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1246                 cmd_uimg(&cmdbuf[5]);
1247         }
1248
1249         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1250                 cmd_time();
1251         }
1252
1253         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1254                 cmd_agup(&cmdbuf[5]);
1255         }
1256
1257         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1258                 cmd_asup(&cmdbuf[5]);
1259         }
1260
1261         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1262                 cmd_gpex(&cmdbuf[5]);
1263         }
1264
1265         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1266                 cmd_spex(&cmdbuf[5]);
1267         }
1268
1269         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1270                 cmd_conf(&cmdbuf[5]);
1271         }
1272
1273         else if (!strncasecmp(cmdbuf, "SEEN", 4)) {
1274                 cmd_seen(&cmdbuf[5]);
1275         }
1276
1277         else if (!strncasecmp(cmdbuf, "GTSN", 4)) {
1278                 cmd_gtsn(&cmdbuf[5]);
1279         }
1280
1281         else if (!strncasecmp(cmdbuf, "VIEW", 4)) {
1282                 cmd_view(&cmdbuf[5]);
1283         }
1284
1285         else if (!strncasecmp(cmdbuf, "ISME", 4)) {
1286                 cmd_isme(&cmdbuf[5]);
1287         }
1288
1289         else if (!DLoader_Exec_Cmd(cmdbuf)) {
1290                 cprintf("%d Unrecognized or unsupported command.\n",
1291                         ERROR + CMD_NOT_SUPPORTED);
1292                }
1293
1294         unbuffer_output();
1295
1296         /* Run any after-each-command routines registered by modules */
1297         PerformSessionHooks(EVT_CMD);
1298 }
1299
1300
1301 /*
1302  * This loop performs all asynchronous functions.
1303  */
1304 void do_async_loop(void) {
1305         PerformSessionHooks(EVT_ASYNC);
1306 }