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