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