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
  19 #if TIME_WITH_SYS_TIME
  20 # include <sys/time.h>
  21 # include <time.h>
  22 #else
  23 # if HAVE_SYS_TIME_H
  24 #  include <sys/time.h>
  25 # else
  26 #  include <time.h>
  27 # endif
  28 #endif
  29
  30 #include <ctype.h>
  31 #include <string.h>
  32 #include <errno.h>
  33 #include <limits.h>
  34 #include <syslog.h>
  35 /* #include <dlfcn.h> */
  36 #include <netdb.h>
  37 #include <sys/types.h>
  38 #include <sys/socket.h>
  39 #include <netinet/in.h>
  40 #include <arpa/inet.h>
  41 #include "citadel.h"
  42 #include "server.h"
  43 #include "dynloader.h"
  44 #include "sysdep_decls.h"
  45 #include "citserver.h"
  46 #include "config.h"
  47 #include "database.h"
  48 #include "housekeeping.h"
  49 #include "user_ops.h"
  50 #include "logging.h"
  51 #include "msgbase.h"
  52 #include "support.h"
  53 #include "locate_host.h"
  54 #include "room_ops.h"
  55 #include "file_ops.h"
  56 #include "policy.h"
  57 #include "control.h"
  58 #include "tools.h"
  59
  60 #ifndef HAVE_SNPRINTF
  61 #include "snprintf.h"
  62 #endif
  63
  64 struct CitContext *ContextList = NULL;
  65 char *unique_session_numbers;
  66 int ScheduledShutdown = 0;
  67 int do_defrag = 0;
  68
  69 /*
  70  * Various things that need to be initialized at startup
  71  */
  72 void master_startup(void) {
  73         struct timeval tv;
  74
  75         lprintf(9, "master_startup() started\n");
  76         lprintf(7, "Opening databases\n");
  77         open_databases();
  78
  79         if (do_defrag) {
  80                 defrag_databases();
  81         }
  82
  83         check_ref_counts();
  84
  85         lprintf(7, "Creating base rooms (if necessary)\n");
  86         create_room(BASEROOM,           0, "", 0, 1);
  87         create_room(AIDEROOM,           3, "", 0, 1);
  88         create_room(SYSCONFIGROOM,      3, "", 0, 1);
  89         create_room(config.c_twitroom,  0, "", 0, 1);
  90
  91         lprintf(7, "Seeding the pseudo-random number generator...\n");
  92         gettimeofday(&tv, NULL);
  93         srand(tv.tv_usec);
  94         lprintf(9, "master_startup() finished\n");
  95 }
  96
  97
  98
  99 /*
 100  * Cleanup routine to be called when the server is shutting down.
 101  * WARNING: It's no longer safe to call this function to force a shutdown.
 102  * Instead, set time_to_die = 1.
 103  */
 104 void master_cleanup(void) {
 105         struct CleanupFunctionHook *fcn;
 106
 107         /* Run any cleanup routines registered by loadable modules */
 108         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
 109                 (*fcn->h_function_pointer)();
 110         }
 111
 112         /* Close databases */
 113         lprintf(7, "Closing databases\n");
 114         close_databases();
 115
 116         /* Do system-dependent stuff */
 117         sysdep_master_cleanup();
 118
 119         /* Now go away. */
 120         lprintf(3, "citserver: exiting.\n");
 121         fflush(stdout); fflush(stderr);
 122         exit(0);
 123 }
 124
 125
 126 /*
 127  * Free any per-session data allocated by modules or whatever
 128  */
 129 void deallocate_user_data(struct CitContext *con)
 130 {
 131         struct CtdlSessData *ptr;
 132
 133         begin_critical_section(S_SESSION_TABLE);
 134         while (con->FirstSessData != NULL) {
 135                 lprintf(9, "Deallocating user data symbol %ld\n",
 136                         con->FirstSessData->sym_id);
 137                 if (con->FirstSessData->sym_data != NULL)
 138                         phree(con->FirstSessData->sym_data);
 139                 ptr = con->FirstSessData->next;
 140                 phree(con->FirstSessData);
 141                 con->FirstSessData = ptr;
 142         }
 143         end_critical_section(S_SESSION_TABLE);
 144 }
 145
 146
 147
 148
 149 /*
 150  * Terminate a session and remove its context data structure.
 151  */
 152 void RemoveContext (struct CitContext *con)
 153 {
 154         struct CitContext *ptr = NULL;
 155         struct CitContext *ToFree = NULL;
 156
 157         lprintf(9, "RemoveContext() called\n");
 158         if (con==NULL) {
 159                 lprintf(5, "WARNING: RemoveContext() called with NULL!\n");
 160                 return;
 161                 }
 162
 163         /* Remove the context from the global context list.  This needs
 164          * to get done FIRST to avoid concurrency problems.  It is *vitally*
 165          * important to keep num_sessions accurate!!
 166          */
 167         lprintf(7, "Removing context for session %d\n", con->cs_pid);
 168         begin_critical_section(S_SESSION_TABLE);
 169         if (ContextList == con) {
 170                 ToFree = ContextList;
 171                 ContextList = ContextList->next;
 172                 --num_sessions;
 173                 }
 174         else {
 175                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
 176                         if (ptr->next == con) {
 177                                 ToFree = ptr->next;
 178                                 ptr->next = ptr->next->next;
 179                                 --num_sessions;
 180                                 }
 181                         }
 182                 }
 183         end_critical_section(S_SESSION_TABLE);
 184
 185         if (ToFree == NULL) {
 186                 lprintf(9, "RemoveContext() found nothing to remove\n");
 187                 return;
 188         }
 189
 190         /* Run any cleanup routines registered by loadable modules.
 191          * Note 1: This must occur *before* deallocate_user_data() because the
 192          *         cleanup functions might touch dynamic session data.
 193          * Note 2: 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(7, "Calling logout(%d)\n", con->cs_pid);
 202         logout(con);
 203
 204         rec_log(CL_TERMINATE, con->curr_user);
 205         unlink(con->temp);
 206         lprintf(3, "citserver[%3d]: ended.\n", con->cs_pid);
 207
 208
 209         syslog(LOG_NOTICE,"session %d: ended", con->cs_pid);
 210
 211         /* Deallocate any user-data attached to this session */
 212         deallocate_user_data(con);
 213
 214         /* If the client is still connected, blow 'em away. */
 215         lprintf(7, "Closing socket %d\n", con->client_socket);
 216         close(con->client_socket);
 217
 218         /* This is where we used to check for scheduled shutdowns. */
 219
 220         /* Free up the memory used by this context */
 221         phree(con);
 222
 223         lprintf(7, "Done with RemoveContext()\n");
 224 }
 225
 226
 227
 228 /*
 229  * Get a dynamic symbol number for per-session user data.
 230  * This API call should be made only ONCE per symbol per citserver run.
 231  */
 232 int CtdlGetDynamicSymbol()
 233 {
 234         static unsigned int next_symbol = SYM_MAX;
 235         return ++next_symbol;
 236 }
 237
 238
 239
 240 /*
 241  * Return a pointer to some generic per-session user data.
 242  * (This function returns NULL if the requested symbol is not allocated.)
 243  *
 244  * NOTE: we use critical sections for allocating and de-allocating these,
 245  *       but not for locating one.
 246  */
 247 void *CtdlGetUserData(unsigned long requested_sym)
 248 {
 249         struct CtdlSessData *ptr;
 250
 251         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)
 252                 if (ptr->sym_id == requested_sym)
 253                         return(ptr->sym_data);
 254
 255         lprintf(2, "ERROR! CtdlGetUserData(%ld) symbol not allocated\n",
 256                 requested_sym);
 257         return NULL;
 258 }
 259
 260
 261 /*
 262  * Allocate some generic per-session user data.
 263  */
 264 void CtdlAllocUserData(unsigned long requested_sym, size_t num_bytes)
 265 {
 266         struct CtdlSessData *ptr;
 267
 268         lprintf(9, "CtdlAllocUserData(%ld) called\n", requested_sym);
 269
 270         /* Fail silently if the symbol is already registered. */
 271         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 272                 if (ptr->sym_id == requested_sym) {
 273                         return;
 274                 }
 275         }
 276
 277         /* Grab us some memory!  Dem's good eatin' !!  */
 278         ptr = mallok(sizeof(struct CtdlSessData));
 279         ptr->sym_id = requested_sym;
 280         ptr->sym_data = mallok(num_bytes);
 281         memset(ptr->sym_data, 0, num_bytes);
 282
 283         begin_critical_section(S_SESSION_TABLE);
 284         ptr->next = CC->FirstSessData;
 285         CC->FirstSessData = ptr;
 286         end_critical_section(S_SESSION_TABLE);
 287
 288         lprintf(9, "CtdlAllocUserData(%ld) finished\n", requested_sym);
 289 }
 290
 291
 292 /*
 293  * Change the size of a buffer allocated with CtdlAllocUserData()
 294  */
 295 void CtdlReallocUserData(unsigned long requested_sym, size_t num_bytes)
 296 {
 297         struct CtdlSessData *ptr;
 298
 299         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 300                 if (ptr->sym_id == requested_sym) {
 301                         ptr->sym_data = reallok(ptr->sym_data, num_bytes);
 302                         return;
 303                 }
 304         }
 305
 306         lprintf(2, "CtdlReallocUserData() ERROR: symbol %ld not found!\n",
 307                 requested_sym);
 308 }
 309
 310
 311
 312
 313
 314
 315 /*
 316  * cmd_info()  -  tell the client about this server
 317  */
 318 void cmd_info(void) {
 319         cprintf("%d Server info:\n", LISTING_FOLLOWS);
 320         cprintf("%d\n", CC->cs_pid);
 321         cprintf("%s\n", config.c_nodename);
 322         cprintf("%s\n", config.c_humannode);
 323         cprintf("%s\n", config.c_fqdn);
 324         cprintf("%s\n", CITADEL);
 325         cprintf("%d\n", REV_LEVEL);
 326         cprintf("%s\n", config.c_bbs_city);
 327         cprintf("%s\n", config.c_sysadm);
 328         cprintf("%d\n", SERVER_TYPE);
 329         cprintf("%s\n", config.c_moreprompt);
 330         cprintf("1\n"); /* 1 = yes, this system supports floors */
 331         cprintf("1\n"); /* 1 = we support the extended paging options */
 332         cprintf("%s\n", CC->cs_nonce);
 333         cprintf("000\n");
 334 }
 335
 336
 337 /*
 338  * returns an asterisk if there are any express messages waiting,
 339  * space otherwise.
 340  */
 341 char CtdlCheckExpress(void) {
 342         if (CC->FirstExpressMessage == NULL) {
 343                 return(' ');
 344                 }
 345         else {
 346                 return('*');
 347                 }
 348         }
 349
 350 void cmd_time(void)
 351 {
 352    time_t tv;
 353
 354    tv = time(NULL);
 355
 356    cprintf("%d %ld\n", OK, tv);
 357 }
 358
 359 /*
 360  * Check whether two hostnames match.
 361  * "Realname" should be an actual name of a client that is trying to connect;
 362  * "testname" should be the value we are comparing it with. The idea is that we
 363  * want to compare with both the abbreviated and fully-qualified versions of
 364  * "testname;" some people define "localhost" as "localhost.foo.com," etc.
 365  */
 366 static int hostnames_match(const char *realname, const char *testname) {
 367         struct hostent *he;
 368         int retval = 0;
 369
 370         if (!strcasecmp(realname, testname))
 371                 return 1;
 372
 373 #ifdef HAVE_NONREENTRANT_NETDB
 374         begin_critical_section(S_NETDB);
 375 #endif
 376
 377         if ((he = gethostbyname(testname)) != NULL)
 378                 if (!strcasecmp(realname, he->h_name))
 379                         retval = 1;
 380
 381 #ifdef HAVE_NONREENTRANT_NETDB
 382         end_critical_section(S_NETDB);
 383 #endif
 384
 385         return retval;
 386         }
 387
 388 /*
 389  * check a hostname against the public_clients file
 390  */
 391 int is_public_client(char *where)
 392 {
 393         char buf[SIZ];
 394         FILE *fp;
 395
 396         lprintf(9, "Checking whether %s is a public client\n", where);
 397
 398         if (hostnames_match(where, "localhost")) return(1);
 399         if (hostnames_match(where, config.c_fqdn)) return(1);
 400
 401         fp = fopen("public_clients","r");
 402         if (fp == NULL) return(0);
 403
 404         while (fgets(buf, sizeof buf, fp)!=NULL) {
 405                 while (isspace((buf[strlen(buf)-1])))
 406                         buf[strlen(buf)-1] = 0;
 407                 if (hostnames_match(where,buf)) {
 408                         fclose(fp);
 409                         return(1);
 410                         }
 411                 }
 412
 413         fclose(fp);
 414         return(0);
 415         }
 416
 417
 418 /*
 419  * the client is identifying itself to the server
 420  */
 421 void cmd_iden(char *argbuf)
 422 {
 423         int dev_code;
 424         int cli_code;
 425         int rev_level;
 426         char desc[SIZ];
 427         char from_host[SIZ];
 428         struct in_addr addr;
 429         int do_lookup = 0;
 430
 431         if (num_parms(argbuf)<4) {
 432                 cprintf("%d usage error\n",ERROR);
 433                 return;
 434         }
 435
 436         dev_code = extract_int(argbuf,0);
 437         cli_code = extract_int(argbuf,1);
 438         rev_level = extract_int(argbuf,2);
 439         extract(desc,argbuf,3);
 440
 441         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 442         from_host[sizeof from_host - 1] = 0;
 443         if (num_parms(argbuf)>=5) extract(from_host,argbuf,4);
 444
 445         CC->cs_clientdev = dev_code;
 446         CC->cs_clienttyp = cli_code;
 447         CC->cs_clientver = rev_level;
 448         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 449         CC->cs_clientname[31] = 0;
 450
 451         if (strlen(from_host) > 0) {
 452                 if (CC->is_local_socket) do_lookup = 1;
 453                 else if (is_public_client(CC->cs_host)) do_lookup = 1;
 454         }
 455
 456         if (do_lookup) {
 457                 lprintf(9, "Looking up hostname '%s'\n", from_host);
 458                 if ((addr.s_addr = inet_addr(from_host)) != -1) {
 459                         locate_host(CC->cs_host, &addr);
 460                 }
 461                 else {
 462                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 463                         CC->cs_host[24] = 0;
 464                 }
 465         }
 466
 467         lprintf(7, "client %d/%d/%01d.%02d (%s)\n",
 468                 dev_code,
 469                 cli_code,
 470                 (rev_level / 100),
 471                 (rev_level % 100),
 472                 desc);
 473
 474         syslog(LOG_NOTICE,"session %d: client %d/%d/%01d.%02d (%s) from %s\n",
 475                 CC->cs_pid,
 476                 dev_code,
 477                 cli_code,
 478                 (rev_level / 100),
 479                 (rev_level % 100),
 480                 desc,
 481                 CC->cs_host);
 482         cprintf("%d Ok\n",OK);
 483 }
 484
 485
 486 /*
 487  * display system messages or help
 488  */
 489 void cmd_mesg(char *mname)
 490 {
 491         FILE *mfp;
 492         char targ[SIZ];
 493         char buf[SIZ];
 494         char *dirs[2];
 495
 496         extract(buf,mname,0);
 497
 498
 499         dirs[0]=mallok(64);
 500         dirs[1]=mallok(64);
 501         strcpy(dirs[0],"messages");
 502         strcpy(dirs[1],"help");
 503         mesg_locate(targ,buf,2,dirs);
 504         phree(dirs[0]);
 505         phree(dirs[1]);
 506
 507
 508         if (strlen(targ)==0) {
 509                 cprintf("%d '%s' not found.\n",ERROR,mname);
 510                 return;
 511                 }
 512
 513         mfp = fopen(targ,"r");
 514         if (mfp==NULL) {
 515                 cprintf("%d Cannot open '%s': %s\n",
 516                         ERROR,targ,strerror(errno));
 517                 return;
 518                 }
 519         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
 520
 521         while (fgets(buf, (SIZ-1), mfp)!=NULL) {
 522                 buf[strlen(buf)-1] = 0;
 523                 do_help_subst(buf);
 524                 cprintf("%s\n",buf);
 525                 }
 526
 527         fclose(mfp);
 528         cprintf("000\n");
 529         }
 530
 531
 532 /*
 533  * enter system messages or help
 534  */
 535 void cmd_emsg(char *mname)
 536 {
 537         FILE *mfp;
 538         char targ[SIZ];
 539         char buf[SIZ];
 540         char *dirs[2];
 541         int a;
 542
 543         if (CtdlAccessCheck(ac_aide)) return;
 544
 545         extract(buf,mname,0);
 546         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 547                 if (buf[a] == '/') buf[a] = '.';
 548                 }
 549
 550         dirs[0]=mallok(64);
 551         dirs[1]=mallok(64);
 552         strcpy(dirs[0],"messages");
 553         strcpy(dirs[1],"help");
 554         mesg_locate(targ,buf,2,dirs);
 555         phree(dirs[0]);
 556         phree(dirs[1]);
 557
 558         if (strlen(targ)==0) {
 559                 snprintf(targ, sizeof targ, "./help/%s", buf);
 560                 }
 561
 562         mfp = fopen(targ,"w");
 563         if (mfp==NULL) {
 564                 cprintf("%d Cannot open '%s': %s\n",
 565                         ERROR,targ,strerror(errno));
 566                 return;
 567                 }
 568         cprintf("%d %s\n", SEND_LISTING, targ);
 569
 570         while (client_gets(buf), strcmp(buf, "000")) {
 571                 fprintf(mfp, "%s\n", buf);
 572                 }
 573
 574         fclose(mfp);
 575         }
 576
 577
 578 /* Don't show the names of private rooms unless the viewing
 579  * user also knows the rooms.
 580  */
 581 void GenerateRoomDisplay(char *real_room,
 582                         struct CitContext *viewed,
 583                         struct CitContext *viewer) {
 584
 585         strcpy(real_room, viewed->quickroom.QRname);
 586         if (viewed->quickroom.QRflags & QR_MAILBOX) {
 587                 strcpy(real_room, &real_room[11]);
 588         }
 589         if (viewed->quickroom.QRflags & QR_PRIVATE) {
 590                 if ( (CtdlRoomAccess(&viewed->quickroom, &viewer->usersupp)
 591                    & UA_KNOWN) == 0) {
 592                         strcpy(real_room, "<private room>");
 593                 }
 594         }
 595
 596         if (viewed->cs_flags & CS_CHAT) {
 597                 while (strlen(real_room) < 14)
 598                         strcat(real_room, " ");
 599
 600                 strcpy(&real_room[14], "<chat>");
 601         }
 602
 603 }
 604
 605 /*
 606  * Convenience function.
 607  */
 608 int CtdlAccessCheck(int required_level) {
 609
 610         if (CC->internal_pgm) return(0);
 611         if (required_level >= ac_internal) {
 612                 cprintf("%d This is not a user-level command.\n",
 613                         ERROR+HIGHER_ACCESS_REQUIRED);
 614                 return(-1);
 615         }
 616
 617         if (CC->usersupp.axlevel >= 6) return(0);
 618         if (required_level >= ac_aide) {
 619                 cprintf("%d This command requires Aide access.\n",
 620                         ERROR+HIGHER_ACCESS_REQUIRED);
 621                 return(-1);
 622         }
 623
 624         if (is_room_aide()) return(0);
 625         if (required_level >= ac_room_aide) {
 626                 cprintf("%d This command requires Aide or Room Aide access.\n",
 627                         ERROR + HIGHER_ACCESS_REQUIRED);
 628                 return(-1);
 629         }
 630
 631         if (CC->logged_in) return(0);
 632         if (required_level >= ac_logged_in) {
 633                 cprintf("%d Not logged in.\n", ERROR+NOT_LOGGED_IN);
 634                 return(-1);
 635         }
 636
 637         /* shhh ... succeed quietly */
 638         return(0);
 639 }
 640
 641
 642
 643 /*
 644  * Terminate another running session
 645  */
 646 void cmd_term(char *cmdbuf)
 647 {
 648         int session_num;
 649         struct CitContext *ccptr;
 650         int found_it = 0;
 651         int allowed = 0;
 652
 653         session_num = extract_int(cmdbuf, 0);
 654         if (session_num == CC->cs_pid) {
 655                 cprintf("%d You can't kill your own session.\n", ERROR);
 656                 return;
 657         }
 658
 659         lprintf(9, "Locating session to kill\n");
 660         begin_critical_section(S_SESSION_TABLE);
 661         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 662                 if (session_num == ccptr->cs_pid) {
 663                         found_it = 1;
 664                         if ((ccptr->usersupp.usernum == CC->usersupp.usernum)
 665                            || (CC->usersupp.axlevel >= 6)) {
 666                                 allowed = 1;
 667                                 ccptr->kill_me = 1;
 668                         }
 669                         else {
 670                                 allowed = 0;
 671                         }
 672                 }
 673         }
 674         end_critical_section(S_SESSION_TABLE);
 675
 676         if (found_it) {
 677                 if (allowed) {
 678                         cprintf("%d Session terminated.\n", OK);
 679                 }
 680                 else {
 681                         cprintf("%d You are not allowed to do that.\n",
 682                                 ERROR + HIGHER_ACCESS_REQUIRED);
 683                 }
 684         }
 685         else {
 686                 cprintf("%d No such session.\n", ERROR);
 687         }
 688 }
 689
 690
 691
 692
 693
 694 /*
 695  * get the paginator prompt
 696  */
 697 void cmd_more(void) {
 698         cprintf("%d %s\n",OK,config.c_moreprompt);
 699         }
 700
 701 /*
 702  * echo
 703  */
 704 void cmd_echo(char *etext)
 705 {
 706         cprintf("%d %s\n",OK,etext);
 707         }
 708
 709
 710
 711 /*
 712  * identify as internal program
 713  */
 714 void cmd_ipgm(char *argbuf)
 715 {
 716         int secret;
 717
 718         secret = extract_int(argbuf, 0);
 719         if (secret == config.c_ipgm_secret) {
 720                 CC->internal_pgm = 1;
 721                 strcpy(CC->curr_user, "<internal program>");
 722                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 723                 cprintf("%d Authenticated as an internal program.\n",OK);
 724                 }
 725         else {
 726                 cprintf("%d Authentication failed.\n",ERROR);
 727                 lprintf(3, "Warning: ipgm authentication failed.\n");
 728                 }
 729         }
 730
 731
 732 /*
 733  * Shut down the server
 734  */
 735 void cmd_down(void) {
 736
 737         if (CtdlAccessCheck(ac_aide)) return;
 738
 739         cprintf("%d Shutting down server.  Goodbye.\n", OK);
 740         time_to_die = 1;
 741         }
 742
 743 /*
 744  * Schedule or cancel a server shutdown
 745  */
 746 void cmd_scdn(char *argbuf)
 747 {
 748         int new_state;
 749
 750         if (CtdlAccessCheck(ac_aide)) return;
 751
 752         new_state = extract_int(argbuf, 0);
 753         if ((new_state == 0) || (new_state == 1)) {
 754                 ScheduledShutdown = new_state;
 755                 }
 756         cprintf("%d %d\n", OK, ScheduledShutdown);
 757 }
 758
 759
 760 /*
 761  * Set or unset asynchronous protocol mode
 762  */
 763 void cmd_asyn(char *argbuf)
 764 {
 765         int new_state;
 766
 767         new_state = extract_int(argbuf, 0);
 768         if ((new_state == 0) || (new_state == 1)) {
 769                 CC->is_async = new_state;
 770         }
 771         cprintf("%d %d\n", OK, CC->is_async);
 772 }
 773
 774
 775 /*
 776  * Generate a "nonce" for APOP-style authentication.
 777  *
 778  * RFC 1725 et al specify a PID to be placed in front of the nonce.
 779  * Quoth BTX: That would be stupid.
 780  */
 781 void generate_nonce(struct CitContext *con) {
 782         struct timeval tv;
 783
 784         memset(con->cs_nonce, NONCE_SIZE, 0);
 785         gettimeofday(&tv, NULL);
 786         memset(con->cs_nonce, NONCE_SIZE, 0);
 787         snprintf(con->cs_nonce, NONCE_SIZE, "<%d%ld@%s>",
 788                 rand(), tv.tv_usec, config.c_fqdn);
 789 }
 790
 791
 792
 793
 794 /*
 795  * Back-end function for starting a session
 796  */
 797 void begin_session(struct CitContext *con)
 798 {
 799         int len;
 800         struct sockaddr_in sin;
 801
 802         /*
 803          * Initialize some variables specific to our context.
 804          */
 805         con->logged_in = 0;
 806         con->internal_pgm = 0;
 807         con->download_fp = NULL;
 808         con->upload_fp = NULL;
 809         con->FirstExpressMessage = NULL;
 810         time(&con->lastcmd);
 811         time(&con->lastidle);
 812         strcpy(con->lastcmdname, "    ");
 813         strcpy(con->cs_clientname, "(unknown)");
 814         strcpy(con->curr_user, NLI);
 815         strcpy(con->net_node,"");
 816         strcpy(con->fake_username, "");
 817         strcpy(con->fake_postname, "");
 818         strcpy(con->fake_hostname, "");
 819         strcpy(con->fake_roomname, "");
 820         generate_nonce(con);
 821         snprintf(con->temp, sizeof con->temp, tmpnam(NULL));
 822         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 823         con->cs_host[sizeof con->cs_host - 1] = 0;
 824         len = sizeof sin;
 825         if (!CC->is_local_socket) {
 826                 if (!getpeername(con->client_socket,
 827                    (struct sockaddr *) &sin, &len))
 828                         locate_host(con->cs_host, &sin.sin_addr);
 829         }
 830         else {
 831                 strcpy(con->cs_host, "");
 832         }
 833         con->cs_flags = 0;
 834         con->upload_type = UPL_FILE;
 835         con->dl_is_net = 0;
 836         con->FirstSessData = NULL;
 837
 838         con->nologin = 0;
 839         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 840                 con->nologin = 1;
 841
 842         lprintf(3, "citserver[%3d]: started.\n", con->cs_pid);
 843
 844         /* Run any session startup routines registered by loadable modules */
 845         PerformSessionHooks(EVT_START);
 846
 847         rec_log(CL_CONNECT, "");
 848 }
 849
 850
 851 void citproto_begin_session() {
 852         if (CC->nologin==1) {
 853                 cprintf("%d %s: Too many users are already online "
 854                         "(maximum is %d)\n",
 855                         ERROR+MAX_SESSIONS_EXCEEDED,
 856                         config.c_nodename, config.c_maxsessions);
 857                 }
 858         else {
 859                 cprintf("%d %s Citadel/UX server ready.\n",
 860                         OK, config.c_nodename);
 861                 }
 862 }
 863
 864
 865
 866
 867 /*
 868  * This loop recognizes all server commands.
 869  */
 870 void do_command_loop(void) {
 871         char cmdbuf[SIZ];
 872
 873         time(&CC->lastcmd);
 874         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 875         if (client_gets(cmdbuf) < 1) {
 876                 lprintf(3, "Client socket is broken.  Ending session.\n");
 877                 CC->kill_me = 1;
 878                 return;
 879         }
 880         lprintf(5, "citserver[%3d]: %s\n", CC->cs_pid, cmdbuf);
 881
 882         /*
 883          * Let other clients see the last command we executed, and
 884          * update the idle time, but not NOOP, PEXP, or GEXP.
 885          */
 886         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 887            && (strncasecmp(cmdbuf, "PEXP", 4))
 888            && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
 889                 strcpy(CC->lastcmdname, "    ");
 890                 safestrncpy(CC->lastcmdname, cmdbuf,
 891                         sizeof(CC->lastcmdname) );
 892                 time(&CC->lastidle);
 893                 }
 894
 895         if ((strncasecmp(cmdbuf, "ENT0", 4))
 896            && (strncasecmp(cmdbuf, "MESG", 4))
 897            && (strncasecmp(cmdbuf, "MSGS", 4)))
 898         {
 899            CC->cs_flags &= ~CS_POSTING;
 900         }
 901
 902         if (!strncasecmp(cmdbuf,"NOOP",4)) {
 903                 cprintf("%d%cok\n",OK,CtdlCheckExpress());
 904                 }
 905
 906         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 907                 cprintf("%d Goodbye.\n",OK);
 908                 CC->kill_me = 1;
 909                 }
 910
 911         else if (!strncasecmp(cmdbuf,"ASYN",4)) {
 912                 cmd_asyn(&cmdbuf[5]);
 913                 }
 914
 915         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 916                 if (CC->logged_in) logout(CC);
 917                 cprintf("%d logged out.\n",OK);
 918                 }
 919
 920         else if (!strncasecmp(cmdbuf,"USER",4)) {
 921                 cmd_user(&cmdbuf[5]);
 922                 }
 923
 924         else if (!strncasecmp(cmdbuf,"PASS",4)) {
 925                 cmd_pass(&cmdbuf[5]);
 926                 }
 927
 928         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 929                 cmd_newu(&cmdbuf[5]);
 930                 }
 931
 932         else if (!strncasecmp(cmdbuf,"SETP",4)) {
 933                 cmd_setp(&cmdbuf[5]);
 934                 }
 935
 936         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 937                 cmd_lrms(&cmdbuf[5]);
 938                 }
 939
 940         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
 941                 cmd_lkra(&cmdbuf[5]);
 942                 }
 943
 944         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
 945                 cmd_lkrn(&cmdbuf[5]);
 946                 }
 947
 948         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
 949                 cmd_lkro(&cmdbuf[5]);
 950                 }
 951
 952         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
 953                 cmd_lzrm(&cmdbuf[5]);
 954                 }
 955
 956         else if (!strncasecmp(cmdbuf,"GETU",4)) {
 957                 cmd_getu();
 958                 }
 959
 960         else if (!strncasecmp(cmdbuf,"SETU",4)) {
 961                 cmd_setu(&cmdbuf[5]);
 962                 }
 963
 964         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
 965                 cmd_goto(&cmdbuf[5]);
 966                 }
 967
 968         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
 969                 cmd_msgs(&cmdbuf[5]);
 970                 }
 971
 972         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
 973                 cmd_whok();
 974                 }
 975
 976         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
 977                 cmd_rdir();
 978                 }
 979
 980         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
 981                 cmd_msg0(&cmdbuf[5]);
 982                 }
 983
 984         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
 985                 cmd_msg2(&cmdbuf[5]);
 986                 }
 987
 988         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
 989                 cmd_msg3(&cmdbuf[5]);
 990                 }
 991
 992         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
 993                 cmd_msg4(&cmdbuf[5]);
 994                 }
 995
 996         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
 997                 cmd_opna(&cmdbuf[5]);
 998                 }
 999
1000         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1001                 cmd_info();
1002                 }
1003
1004         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1005                 cmd_slrp(&cmdbuf[5]);
1006                 }
1007
1008         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1009                 cmd_invt_kick(&cmdbuf[5],1);
1010                 }
1011
1012         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1013                 cmd_invt_kick(&cmdbuf[5],0);
1014                 }
1015
1016         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1017                 cmd_getr();
1018                 }
1019
1020         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1021                 cmd_setr(&cmdbuf[5]);
1022                 }
1023
1024         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1025                 cmd_geta();
1026                 }
1027
1028         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1029                 cmd_seta(&cmdbuf[5]);
1030                 }
1031
1032         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1033                 cmd_ent0(&cmdbuf[5]);
1034                 }
1035
1036         else if (!strncasecmp(cmdbuf,"ENT3",4)) {
1037                 cmd_ent3(&cmdbuf[5]);
1038                 }
1039
1040         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1041                 cmd_rinf();
1042                 }
1043
1044         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1045                 cmd_dele(&cmdbuf[5]);
1046                 }
1047
1048         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1049                 cmd_kill(&cmdbuf[5]);
1050                 }
1051
1052         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1053                 cmd_cre8(&cmdbuf[5]);
1054                 }
1055
1056         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1057                 cmd_move(&cmdbuf[5]);
1058                 }
1059
1060         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1061                 cmd_forg();
1062                 }
1063
1064         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1065                 cmd_mesg(&cmdbuf[5]);
1066                 }
1067
1068         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1069                 cmd_emsg(&cmdbuf[5]);
1070                 }
1071
1072         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1073                 cmd_gnur();
1074                 }
1075
1076         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1077                 cmd_vali(&cmdbuf[5]);
1078                 }
1079
1080         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1081                 cmd_einf(&cmdbuf[5]);
1082                 }
1083
1084         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1085                 cmd_list();
1086                 }
1087
1088         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1089                 cmd_chek();
1090                 }
1091
1092         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1093                 cmd_delf(&cmdbuf[5]);
1094                 }
1095
1096         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1097                 cmd_movf(&cmdbuf[5]);
1098                 }
1099
1100         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1101                 cmd_netf(&cmdbuf[5]);
1102                 }
1103
1104         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1105                 cmd_open(&cmdbuf[5]);
1106                 }
1107
1108         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1109                 cmd_clos();
1110                 }
1111
1112         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1113                 cmd_uopn(&cmdbuf[5]);
1114                 }
1115
1116         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1117                 cmd_ucls(&cmdbuf[5]);
1118                 }
1119
1120         else if (!strncasecmp(cmdbuf,"READ",4)) {
1121                 cmd_read(&cmdbuf[5]);
1122                 }
1123
1124         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1125                 cmd_writ(&cmdbuf[5]);
1126                 }
1127
1128         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1129                 cmd_qusr(&cmdbuf[5]);
1130                 }
1131
1132         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1133                 cmd_echo(&cmdbuf[5]);
1134                 }
1135
1136         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1137                 cmd_oimg(&cmdbuf[5]);
1138                 }
1139
1140         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1141                 cmd_more();
1142                 }
1143
1144         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1145                 cmd_ndop(&cmdbuf[5]);
1146                 }
1147
1148         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1149                 cmd_nuop(&cmdbuf[5]);
1150                 }
1151
1152         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1153                 cmd_lflr();
1154                 }
1155
1156         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1157                 cmd_cflr(&cmdbuf[5]);
1158                 }
1159
1160         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1161                 cmd_kflr(&cmdbuf[5]);
1162                 }
1163
1164         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1165                 cmd_eflr(&cmdbuf[5]);
1166                 }
1167
1168         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1169                 cmd_iden(&cmdbuf[5]);
1170                 }
1171
1172         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1173                 cmd_ipgm(&cmdbuf[5]);
1174                 }
1175
1176         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1177                 cmd_term(&cmdbuf[5]);
1178                 }
1179
1180         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1181                 cmd_down();
1182                 }
1183
1184         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1185                 cmd_scdn(&cmdbuf[5]);
1186                 }
1187
1188         else if (!strncasecmp(cmdbuf, "NSET", 4)) {
1189                 cmd_nset(&cmdbuf[5]);
1190                 }
1191
1192         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1193                 cmd_uimg(&cmdbuf[5]);
1194                 }
1195
1196         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1197                 cmd_time();
1198                 }
1199
1200         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1201                 cmd_agup(&cmdbuf[5]);
1202                 }
1203
1204         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1205                 cmd_asup(&cmdbuf[5]);
1206                 }
1207
1208         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1209                 cmd_gpex(&cmdbuf[5]);
1210                 }
1211
1212         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1213                 cmd_spex(&cmdbuf[5]);
1214                 }
1215
1216         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1217                 cmd_conf(&cmdbuf[5]);
1218                 }
1219
1220         else if (!strncasecmp(cmdbuf, "SEEN", 4)) {
1221                 cmd_seen(&cmdbuf[5]);
1222                 }
1223
1224 #ifdef DEBUG_MEMORY_LEAKS
1225         else if (!strncasecmp(cmdbuf, "LEAK", 4)) {
1226                 dump_tracked();
1227                 }
1228 #endif
1229
1230         else if (!DLoader_Exec_Cmd(cmdbuf))
1231                 {
1232                    cprintf("%d Unrecognized or unsupported command.\n",
1233                             ERROR);
1234                 }
1235
1236         /* Run any after-each-command outines registered by modules */
1237         PerformSessionHooks(EVT_CMD);
1238 }