citadel/citserver.c

   1 /* $Id$ */
   2 #include "sysdep.h"
   3 #include <stdlib.h>
   4 #include <unistd.h>
   5 #include <stdio.h>
   6 #include <fcntl.h>
   7 #include <signal.h>
   8 #include <time.h>
   9 #include <ctype.h>
  10 #include <string.h>
  11 #include <errno.h>
  12 #include <limits.h>
  13 #include <syslog.h>
  14 #include <dlfcn.h>
  15 #include <netdb.h>
  16 #include <sys/types.h>
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <arpa/inet.h>
  20 #include "citadel.h"
  21 #include "server.h"
  22 #include "sysdep_decls.h"
  23 #include "citserver.h"
  24 #include "config.h"
  25 #include "database.h"
  26 #include "housekeeping.h"
  27 #include "user_ops.h"
  28 #include "logging.h"
  29 #include "msgbase.h"
  30 #include "support.h"
  31 #include "locate_host.h"
  32 #include "room_ops.h"
  33 #include "file_ops.h"
  34 #include "dynloader.h"
  35 #include "policy.h"
  36 #include "control.h"
  37 #include "tools.h"
  38
  39 struct CitContext *ContextList = NULL;
  40 char *unique_session_numbers;
  41 int ScheduledShutdown = 0;
  42 int do_defrag = 0;
  43
  44 /*
  45  * Various things that need to be initialized at startup
  46  */
  47 void master_startup(void) {
  48         lprintf(7, "Opening databases\n");
  49         open_databases();
  50
  51         if (do_defrag)
  52                 defrag_databases();
  53
  54         lprintf(7, "Checking floor reference counts\n");
  55         check_ref_counts();
  56
  57         lprintf(7, "Creating base rooms (if necessary)\n");
  58         create_room(BASEROOM,           0, "", 0);
  59         create_room(AIDEROOM,           3, "", 0);
  60         create_room(SYSCONFIGROOM,      3, "", 0);
  61         create_room(config.c_twitroom,  0, "", 0);
  62         }
  63
  64 /*
  65  * Cleanup routine to be called when the server is shutting down.
  66  */
  67 void master_cleanup(void) {
  68         struct CleanupFunctionHook *fcn;
  69
  70         /* Cancel all running sessions */
  71         lprintf(7, "Cancelling running sessions...\n");
  72
  73 /* FIX do something here
  74         while (ContextList != NULL) {
  75                 }
  76  */
  77
  78         /* Run any cleanup routines registered by loadable modules */
  79         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
  80                 (*fcn->h_function_pointer)();
  81                 }
  82
  83         /* Close databases */
  84         lprintf(7, "Closing databases\n");
  85         close_databases();
  86
  87         /* Do system-dependent stuff */
  88         sysdep_master_cleanup();
  89
  90         /* Now go away. */
  91         lprintf(3, "citserver: exiting.\n");
  92         fflush(stdout); fflush(stderr);
  93         exit(0);
  94         }
  95
  96
  97 /*
  98  * Free any per-session data allocated by modules or whatever
  99  */
 100 void deallocate_user_data(struct CitContext *con)
 101 {
 102         struct CtdlSessData *ptr;
 103
 104         begin_critical_section(S_SESSION_TABLE);
 105         while (con->FirstSessData != NULL) {
 106                 lprintf(9, "Deallocating user data symbol %ld\n",
 107                         con->FirstSessData->sym_id);
 108                 if (con->FirstSessData->sym_data != NULL)
 109                         phree(con->FirstSessData->sym_data);
 110                 ptr = con->FirstSessData->next;
 111                 phree(con->FirstSessData);
 112                 con->FirstSessData = ptr;
 113         }
 114         end_critical_section(S_SESSION_TABLE);
 115 }
 116
 117
 118
 119
 120 /*
 121  * Terminate a session and remove its context data structure.
 122  */
 123 void RemoveContext (struct CitContext *con)
 124 {
 125         struct CitContext *ptr = NULL;
 126         struct CitContext *ToFree = NULL;
 127
 128         lprintf(9, "RemoveContext() called\n");
 129         if (con==NULL) {
 130                 lprintf(5, "WARNING: RemoveContext() called with NULL!\n");
 131                 return;
 132                 }
 133
 134         /* Remove the context from the global context list.  This needs
 135          * to get done FIRST to avoid concurrency problems.  It is *vitally*
 136          * important to keep num_sessions accurate!!
 137          */
 138         lprintf(7, "Removing context for session %d\n", con->cs_pid);
 139         begin_critical_section(S_SESSION_TABLE);
 140         if (ContextList == con) {
 141                 ToFree = ContextList;
 142                 ContextList = ContextList->next;
 143                 --num_sessions;
 144                 }
 145         else {
 146                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
 147                         if (ptr->next == con) {
 148                                 ToFree = ptr->next;
 149                                 ptr->next = ptr->next->next;
 150                                 --num_sessions;
 151                                 }
 152                         }
 153                 }
 154         end_critical_section(S_SESSION_TABLE);
 155
 156         if (ToFree == NULL) {
 157                 lprintf(9, "RemoveContext() found nothing to remove\n");
 158                 return;
 159         }
 160
 161         /* Now handle all of the administrivia. */
 162         lprintf(7, "Calling logout(%d)\n", con->cs_pid);
 163         logout(con);
 164
 165         rec_log(CL_TERMINATE, con->curr_user);
 166         unlink(con->temp);
 167         lprintf(3, "citserver[%3d]: ended.\n", con->cs_pid);
 168
 169         /* Run any cleanup routines registered by loadable modules.
 170          * (Must occur *before* deallocate_user_data() because the cleanup
 171          * functions might touch dynamic session data)
 172          */
 173         PerformSessionHooks(EVT_STOP);
 174
 175         syslog(LOG_NOTICE,"session %d ended", con->cs_pid);
 176
 177         /* Deallocate any user-data attached to this session */
 178         deallocate_user_data(con);
 179
 180         /* If the client is still connected, blow 'em away. */
 181         lprintf(7, "Closing socket %d\n", con->client_socket);
 182         close(con->client_socket);
 183
 184         /* Tell the housekeeping thread to check to see if this is the time
 185          * to initiate a scheduled shutdown event.
 186          */
 187         enter_housekeeping_cmd("SCHED_SHUTDOWN");
 188
 189         /* Free up the memory used by this context */
 190         phree(con);
 191
 192         lprintf(7, "Done with RemoveContext()\n");
 193 }
 194
 195
 196
 197 /*
 198  * Get a dynamic symbol number for per-session user data.
 199  * This API call should be made only ONCE per symbol per citserver run.
 200  */
 201 int CtdlGetDynamicSymbol()
 202 {
 203         static unsigned int next_symbol = SYM_MAX;
 204         return ++next_symbol;
 205 }
 206
 207
 208
 209 /*
 210  * Return a pointer to some generic per-session user data.
 211  * (This function returns NULL if the requested symbol is not allocated.)
 212  *
 213  * NOTE: we use critical sections for allocating and de-allocating these,
 214  *       but not for locating one.
 215  */
 216 void *CtdlGetUserData(unsigned long requested_sym)
 217 {
 218         struct CtdlSessData *ptr;
 219
 220         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)
 221                 if (ptr->sym_id == requested_sym)
 222                         return(ptr->sym_data);
 223
 224         lprintf(2, "ERROR! CtdlGetUserData(%ld) symbol not allocated\n",
 225                 requested_sym);
 226         return NULL;
 227 }
 228
 229
 230 /*
 231  * Allocate some generic per-session user data.
 232  */
 233 void CtdlAllocUserData(unsigned long requested_sym, size_t num_bytes)
 234 {
 235         struct CtdlSessData *ptr;
 236
 237         lprintf(9, "CtdlAllocUserData(%ld) called\n", requested_sym);
 238
 239         /* Fail silently if the symbol is already registered. */
 240         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 241                 if (ptr->sym_id == requested_sym) {
 242                         return;
 243                 }
 244         }
 245
 246         /* Grab us some memory!  Dem's good eatin' !!  */
 247         ptr = mallok(sizeof(struct CtdlSessData));
 248         ptr->sym_id = requested_sym;
 249         ptr->sym_data = mallok(num_bytes);
 250         memset(ptr->sym_data, 0, num_bytes);
 251
 252         begin_critical_section(S_SESSION_TABLE);
 253         ptr->next = CC->FirstSessData;
 254         CC->FirstSessData = ptr;
 255         end_critical_section(S_SESSION_TABLE);
 256
 257         lprintf(9, "CtdlAllocUserData(%ld) finished\n", requested_sym);
 258 }
 259
 260
 261 /*
 262  * Change the size of a buffer allocated with CtdlAllocUserData()
 263  */
 264 void CtdlReallocUserData(unsigned long requested_sym, size_t num_bytes)
 265 {
 266         struct CtdlSessData *ptr;
 267
 268         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 269                 if (ptr->sym_id == requested_sym) {
 270                         ptr->sym_data = reallok(ptr->sym_data, num_bytes);
 271                         return;
 272                 }
 273         }
 274
 275         lprintf(2, "CtdlReallocUserData() ERROR: symbol %ld not found!\n",
 276                 requested_sym);
 277 }
 278
 279
 280
 281
 282
 283
 284 /*
 285  * cmd_info()  -  tell the client about this server
 286  */
 287 void cmd_info(void) {
 288         cprintf("%d Server info:\n",LISTING_FOLLOWS);
 289         cprintf("%d\n",CC->cs_pid);
 290         cprintf("%s\n",config.c_nodename);
 291         cprintf("%s\n",config.c_humannode);
 292         cprintf("%s\n",config.c_fqdn);
 293         cprintf("%s\n",CITADEL);
 294         cprintf("%d\n",REV_LEVEL);
 295         cprintf("%s\n",config.c_bbs_city);
 296         cprintf("%s\n",config.c_sysadm);
 297         cprintf("%d\n",SERVER_TYPE);
 298         cprintf("%s\n",config.c_moreprompt);
 299         cprintf("1\n"); /* 1 = yes, this system supports floors */
 300         cprintf("1\n"); /* 1 = we support the extended paging options */
 301         cprintf("000\n");
 302         }
 303
 304 void cmd_rchg(char *argbuf)
 305 {
 306         char newroomname[256];
 307
 308         extract(newroomname, argbuf, 0);
 309         newroomname[ROOMNAMELEN-1] = 0;
 310         if (strlen(newroomname) > 0) {
 311                 safestrncpy(CC->fake_roomname, newroomname,
 312                         sizeof(CC->fake_roomname) );
 313                 }
 314         else {
 315                 strcpy(CC->fake_roomname, "");
 316                 }
 317         cprintf("%d OK\n", OK);
 318 }
 319
 320 void cmd_hchg(char *argbuf)
 321 {
 322         char newhostname[256];
 323
 324         extract(newhostname, argbuf, 0);
 325         if (strlen(newhostname) > 0) {
 326                 safestrncpy(CC->fake_hostname, newhostname,
 327                         sizeof(CC->fake_hostname) );
 328                 }
 329         else {
 330                 strcpy(CC->fake_hostname, "");
 331                 }
 332         cprintf("%d OK\n", OK);
 333 }
 334
 335 void cmd_uchg(char *argbuf)
 336 {
 337
 338         char newusername[256];
 339
 340         extract(newusername, argbuf, 0);
 341
 342         if (CC->usersupp.axlevel < 6) {
 343                 cprintf("%d You must be an Aide to masquerade your name.\n",
 344                         ERROR+HIGHER_ACCESS_REQUIRED);
 345                 return;
 346         }
 347
 348         if (strlen(newusername) > 0) {
 349                 CC->cs_flags &= ~CS_STEALTH;
 350                 memset(CC->fake_username, 0, 32);
 351                 if (strncasecmp(newusername, CC->curr_user,
 352                                 strlen(CC->curr_user)))
 353                         safestrncpy(CC->fake_username, newusername,
 354                                 sizeof(CC->fake_username));
 355         }
 356         else {
 357                 CC->fake_username[0] = '\0';
 358                 CC->cs_flags |= CS_STEALTH;
 359         }
 360         cprintf("%d\n",OK);
 361 }
 362
 363
 364
 365 /*
 366  * returns an asterisk if there are any express messages waiting,
 367  * space otherwise.
 368  */
 369 char check_express(void) {
 370         if (CC->FirstExpressMessage == NULL) {
 371                 return(' ');
 372                 }
 373         else {
 374                 return('*');
 375                 }
 376         }
 377
 378 void cmd_time(void)
 379 {
 380    time_t tv;
 381
 382    tv = time(NULL);
 383
 384    cprintf("%d %ld\n", OK, tv);
 385 }
 386
 387 /*
 388  * Check whether two hostnames match.
 389  * "Realname" should be an actual name of a client that is trying to connect;
 390  * "testname" should be the value we are comparing it with. The idea is that we
 391  * want to compare with both the abbreviated and fully-qualified versions of
 392  * "testname;" some people define "localhost" as "localhost.foo.com," etc.
 393  */
 394 static int hostnames_match(const char *realname, const char *testname) {
 395         struct hostent *he;
 396         int retval = 0;
 397
 398         if (!strcasecmp(realname, testname))
 399                 return 1;
 400
 401 #ifdef HAVE_NONREENTRANT_NETDB
 402         begin_critical_section(S_NETDB);
 403 #endif
 404
 405         if ((he = gethostbyname(testname)) != NULL)
 406                 if (!strcasecmp(realname, he->h_name))
 407                         retval = 1;
 408
 409 #ifdef HAVE_NONREENTRANT_NETDB
 410         end_critical_section(S_NETDB);
 411 #endif
 412
 413         return retval;
 414         }
 415
 416 /*
 417  * check a hostname against the public_clients file
 418  */
 419 int is_public_client(char *where)
 420 {
 421         char buf[256];
 422         FILE *fp;
 423
 424         if (hostnames_match(where,"localhost")) return(1);
 425         if (hostnames_match(where,config.c_fqdn)) return(1);
 426
 427         fp = fopen("public_clients","r");
 428         if (fp == NULL) return(0);
 429
 430         while (fgets(buf,256,fp)!=NULL) {
 431                 while (isspace((buf[strlen(buf)-1])))
 432                         buf[strlen(buf)-1] = 0;
 433                 if (hostnames_match(where,buf)) {
 434                         fclose(fp);
 435                         return(1);
 436                         }
 437                 }
 438
 439         fclose(fp);
 440         return(0);
 441         }
 442
 443
 444 /*
 445  * the client is identifying itself to the server
 446  */
 447 void cmd_iden(char *argbuf)
 448 {
 449         int dev_code;
 450         int cli_code;
 451         int rev_level;
 452         char desc[256];
 453         char from_host[256];
 454         struct in_addr addr;
 455
 456         if (num_parms(argbuf)<4) {
 457                 cprintf("%d usage error\n",ERROR);
 458                 return;
 459                 }
 460
 461         dev_code = extract_int(argbuf,0);
 462         cli_code = extract_int(argbuf,1);
 463         rev_level = extract_int(argbuf,2);
 464         extract(desc,argbuf,3);
 465
 466         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 467         from_host[sizeof from_host - 1] = 0;
 468         if (num_parms(argbuf)>=5) extract(from_host,argbuf,4);
 469
 470         CC->cs_clientdev = dev_code;
 471         CC->cs_clienttyp = cli_code;
 472         CC->cs_clientver = rev_level;
 473         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 474         CC->cs_clientname[31] = 0;
 475
 476         lprintf(9, "Looking up hostname '%s'\n", from_host);
 477         if ((strlen(from_host)>0) &&
 478            (is_public_client(CC->cs_host))) {
 479                 if ((addr.s_addr = inet_addr(from_host)) != INADDR_NONE)
 480                         locate_host(CC->cs_host, &addr);
 481                 else {
 482                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 483                         CC->cs_host[24] = 0;
 484                         }
 485                 }
 486
 487         syslog(LOG_NOTICE,"client %d/%d/%01d.%02d (%s)\n",
 488                 dev_code,
 489                 cli_code,
 490                 (rev_level / 100),
 491                 (rev_level % 100),
 492                 desc);
 493                 cprintf("%d Ok\n",OK);
 494         }
 495
 496
 497 /*
 498  * enter or exit "stealth mode"
 499  */
 500 void cmd_stel(char *cmdbuf)
 501 {
 502         int requested_mode;
 503
 504         requested_mode = extract_int(cmdbuf,0);
 505         if (requested_mode !=0) requested_mode = 1;
 506
 507         if (!CC->logged_in) {
 508                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 509                 return;
 510                 }
 511
 512         if (CC->usersupp.axlevel < 6) {
 513                 cprintf("%d You must be an Aide to use stealth mode.\n",
 514                         ERROR+HIGHER_ACCESS_REQUIRED);
 515                 return;
 516                 }
 517
 518         if (CC->cs_flags & CS_STEALTH) {
 519                 if (requested_mode == 0)
 520                         CC->cs_flags = CC->cs_flags-CS_STEALTH;
 521                 }
 522         else {
 523                 if (requested_mode == 1)
 524                         CC->cs_flags = CC->cs_flags|CS_STEALTH;
 525                 }
 526
 527         cprintf("%d Ok\n",OK);
 528         }
 529
 530
 531
 532
 533 /*
 534  * display system messages or help
 535  */
 536 void cmd_mesg(char *mname)
 537 {
 538         FILE *mfp;
 539         char targ[256];
 540         char buf[256];
 541         char *dirs[2];
 542
 543         extract(buf,mname,0);
 544
 545
 546         dirs[0]=mallok(64);
 547         dirs[1]=mallok(64);
 548         strcpy(dirs[0],"messages");
 549         strcpy(dirs[1],"help");
 550         mesg_locate(targ,buf,2,dirs);
 551         phree(dirs[0]);
 552         phree(dirs[1]);
 553
 554
 555         if (strlen(targ)==0) {
 556                 cprintf("%d '%s' not found.\n",ERROR,mname);
 557                 return;
 558                 }
 559
 560         mfp = fopen(targ,"r");
 561         if (mfp==NULL) {
 562                 cprintf("%d Cannot open '%s': %s\n",
 563                         ERROR,targ,strerror(errno));
 564                 return;
 565                 }
 566         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
 567
 568         while (fgets(buf,255,mfp)!=NULL) {
 569                 buf[strlen(buf)-1] = 0;
 570                 do_help_subst(buf);
 571                 cprintf("%s\n",buf);
 572                 }
 573
 574         fclose(mfp);
 575         cprintf("000\n");
 576         }
 577
 578
 579 /*
 580  * enter system messages or help
 581  */
 582 void cmd_emsg(char *mname)
 583 {
 584         FILE *mfp;
 585         char targ[256];
 586         char buf[256];
 587         char *dirs[2];
 588         int a;
 589
 590         if (CC->usersupp.axlevel < 6) {
 591                 cprintf("%d You must be an Aide to edit system messages.\n",
 592                         ERROR+HIGHER_ACCESS_REQUIRED);
 593                 return;
 594                 }
 595
 596         extract(buf,mname,0);
 597         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 598                 if (buf[a] == '/') buf[a] = '.';
 599                 }
 600
 601         dirs[0]=mallok(64);
 602         dirs[1]=mallok(64);
 603         strcpy(dirs[0],"messages");
 604         strcpy(dirs[1],"help");
 605         mesg_locate(targ,buf,2,dirs);
 606         phree(dirs[0]);
 607         phree(dirs[1]);
 608
 609         if (strlen(targ)==0) {
 610                 snprintf(targ, sizeof targ, "./help/%s", buf);
 611                 }
 612
 613         mfp = fopen(targ,"w");
 614         if (mfp==NULL) {
 615                 cprintf("%d Cannot open '%s': %s\n",
 616                         ERROR,targ,strerror(errno));
 617                 return;
 618                 }
 619         cprintf("%d %s\n", SEND_LISTING, targ);
 620
 621         while (client_gets(buf), strcmp(buf, "000")) {
 622                 fprintf(mfp, "%s\n", buf);
 623                 }
 624
 625         fclose(mfp);
 626         }
 627
 628
 629 /* Don't show the names of private rooms unless the viewing
 630  * user also knows the rooms.
 631  */
 632 void GenerateRoomDisplay(char *real_room,
 633                         struct CitContext *viewed,
 634                         struct CitContext *viewer) {
 635
 636         strcpy(real_room, viewed->quickroom.QRname);
 637         if (viewed->quickroom.QRflags & QR_MAILBOX) {
 638                 strcpy(real_room, &real_room[11]);
 639         }
 640         if (viewed->quickroom.QRflags & QR_PRIVATE) {
 641                 if ( (CtdlRoomAccess(&viewed->quickroom, &viewer->usersupp)
 642                    & UA_KNOWN) == 0) {
 643                         strcpy(real_room, "<private room>");
 644                 }
 645         }
 646
 647         if (viewed->cs_flags & CS_CHAT) {
 648                 while (strlen(real_room) < 14)
 649                         strcat(real_room, " ");
 650
 651                 strcpy(&real_room[14], "<chat>");
 652         }
 653
 654 }
 655
 656
 657 /*
 658  * who's online
 659  */
 660 void cmd_rwho(void) {
 661         struct CitContext *cptr;
 662         int spoofed = 0;
 663         int aide;
 664         char un[40];
 665         char real_room[ROOMNAMELEN], room[ROOMNAMELEN];
 666         char host[40], flags[5];
 667
 668         aide = CC->usersupp.axlevel >= 6;
 669         cprintf("%d%c \n", LISTING_FOLLOWS, check_express() );
 670
 671         for (cptr = ContextList; cptr != NULL; cptr = cptr->next)
 672         {
 673                 flags[0] = '\0';
 674                 spoofed = 0;
 675
 676                 if (cptr->cs_flags & CS_POSTING)
 677                    strcat(flags, "*");
 678                 else
 679                    strcat(flags, ".");
 680
 681                 if (cptr->fake_username[0])
 682                 {
 683                    strcpy(un, cptr->fake_username);
 684                    spoofed = 1;
 685                 }
 686                 else
 687                    strcpy(un, cptr->curr_user);
 688
 689                 if (cptr->fake_hostname[0])
 690                 {
 691                    strcpy(host, cptr->fake_hostname);
 692                    spoofed = 1;
 693                 }
 694                 else
 695                    strcpy(host, cptr->cs_host);
 696
 697                 GenerateRoomDisplay(real_room, cptr, CC);
 698
 699                 if (cptr->fake_roomname[0]) {
 700                         strcpy(room, cptr->fake_roomname);
 701                         spoofed = 1;
 702                 }
 703                 else {
 704                         strcpy(room, real_room);
 705                 }
 706
 707                 if ((aide) && (spoofed))
 708                    strcat(flags, "+");
 709
 710                 if ((cptr->cs_flags & CS_STEALTH) && (aide))
 711                    strcat(flags, "-");
 712
 713                 if (((cptr->cs_flags&CS_STEALTH)==0) || (aide))
 714                 {
 715                         cprintf("%d|%s|%s|%s|%s|%ld|%s|%s\n",
 716                                 cptr->cs_pid, un, room,
 717                                 host, cptr->cs_clientname,
 718                                 (long)(cptr->lastidle),
 719                                 cptr->lastcmdname, flags);
 720                 }
 721                 if ((spoofed) && (aide))
 722                 {
 723                         cprintf("%d|%s|%s|%s|%s|%ld|%s|%s\n",
 724                                 cptr->cs_pid, cptr->curr_user,
 725                                 real_room,
 726                                 cptr->cs_host, cptr->cs_clientname,
 727                                 (long)(cptr->lastidle),
 728                                 cptr->lastcmdname, flags);
 729
 730                 }
 731         }
 732
 733         /* Now it's magic time.  Before we finish, call any EVT_RWHO hooks
 734          * so that external paging modules such as serv_icq can add more
 735          * content to the Wholist.
 736          */
 737         PerformSessionHooks(EVT_RWHO);
 738         cprintf("000\n");
 739         }
 740
 741
 742 /*
 743  * Terminate another running session
 744  */
 745 void cmd_term(char *cmdbuf)
 746 {
 747         int session_num;
 748         struct CitContext *ccptr;
 749         int found_it = 0;
 750
 751         if (!CC->logged_in) {
 752                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 753                 return;
 754                 }
 755
 756         if (CC->usersupp.axlevel < 6) {
 757                 cprintf("%d You must be an Aide to terminate sessions.\n",
 758                         ERROR+HIGHER_ACCESS_REQUIRED);
 759                 return;
 760                 }
 761
 762         session_num = extract_int(cmdbuf, 0);
 763         if (session_num == CC->cs_pid) {
 764                 cprintf("%d You can't kill your own session.\n", ERROR);
 765                 return;
 766                 }
 767
 768         lprintf(9, "Locating session to kill\n");
 769         begin_critical_section(S_SESSION_TABLE);
 770         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 771                 if (session_num == ccptr->cs_pid) {
 772                         ccptr->kill_me = 1;
 773                         found_it = 1;
 774                         }
 775                 }
 776         end_critical_section(S_SESSION_TABLE);
 777
 778         if (found_it) {
 779                 cprintf("%d Session terminated.\n", OK);
 780                 }
 781         else {
 782                 cprintf("%d No such session.\n", ERROR);
 783                 }
 784         }
 785
 786
 787
 788
 789
 790 /*
 791  * get the paginator prompt
 792  */
 793 void cmd_more(void) {
 794         cprintf("%d %s\n",OK,config.c_moreprompt);
 795         }
 796
 797 /*
 798  * echo
 799  */
 800 void cmd_echo(char *etext)
 801 {
 802         cprintf("%d %s\n",OK,etext);
 803         }
 804
 805
 806
 807 /*
 808  * identify as internal program
 809  */
 810 void cmd_ipgm(char *argbuf)
 811 {
 812         int secret;
 813
 814         secret = extract_int(argbuf, 0);
 815         if (secret == config.c_ipgm_secret) {
 816                 CC->internal_pgm = 1;
 817                 strcpy(CC->curr_user, "<internal program>");
 818                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 819                 cprintf("%d Authenticated as an internal program.\n",OK);
 820                 }
 821         else {
 822                 cprintf("%d Authentication failed.\n",ERROR);
 823                 lprintf(3, "Warning: ipgm authentication failed.\n");
 824                 }
 825         }
 826
 827
 828 /*
 829  * Shut down the server
 830  */
 831 void cmd_down(void) {
 832         if (!CC->logged_in) {
 833                 cprintf("%d Not logged in.\n", ERROR+NOT_LOGGED_IN);
 834                 return;
 835                 }
 836
 837         if (CC->usersupp.axlevel < 6) {
 838                 cprintf("%d You must be an Aide to shut down the server.\n",
 839                         ERROR+HIGHER_ACCESS_REQUIRED);
 840                 return;
 841                 }
 842
 843         cprintf("%d Shutting down server.  Goodbye.\n", OK);
 844         master_cleanup();
 845         }
 846
 847 /*
 848  * Schedule or cancel a server shutdown
 849  */
 850 void cmd_scdn(char *argbuf)
 851 {
 852         int new_state;
 853
 854         if (!CC->logged_in) {
 855                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 856                 return;
 857                 }
 858
 859         if (CC->usersupp.axlevel < 6) {
 860                 cprintf("%d You must be an Aide to schedule a shutdown.\n",
 861                         ERROR+HIGHER_ACCESS_REQUIRED);
 862                 return;
 863                 }
 864
 865         new_state = extract_int(argbuf, 0);
 866         if ((new_state == 0) || (new_state == 1)) {
 867                 ScheduledShutdown = new_state;
 868                 }
 869         cprintf("%d %d\n", OK, ScheduledShutdown);
 870         }
 871
 872
 873 /*
 874  * Back-end function for starting a session
 875  */
 876 void begin_session(struct CitContext *con)
 877 {
 878         int len;
 879         struct sockaddr_in sin;
 880
 881         /*
 882          * Initialize some variables specific to our context.
 883          */
 884         con->logged_in = 0;
 885         con->internal_pgm = 0;
 886         con->download_fp = NULL;
 887         con->upload_fp = NULL;
 888         con->FirstExpressMessage = NULL;
 889         time(&con->lastcmd);
 890         time(&con->lastidle);
 891         strcpy(con->lastcmdname, "    ");
 892         strcpy(con->cs_clientname, "(unknown)");
 893         strcpy(con->curr_user, NLI);
 894         strcpy(con->net_node,"");
 895         snprintf(con->temp, sizeof con->temp, tmpnam(NULL));
 896         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 897         con->cs_host[sizeof con->cs_host - 1] = 0;
 898         len = sizeof sin;
 899         if (!getpeername(con->client_socket, (struct sockaddr *) &sin, &len))
 900                 locate_host(con->cs_host, &sin.sin_addr);
 901         con->cs_flags = 0;
 902         con->upload_type = UPL_FILE;
 903         con->dl_is_net = 0;
 904         con->FirstSessData = NULL;
 905
 906         con->nologin = 0;
 907         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 908                 con->nologin = 1;
 909
 910         lprintf(3, "citserver[%3d]: started.\n", con->cs_pid);
 911
 912         /* Run any session startup routines registered by loadable modules */
 913         PerformSessionHooks(EVT_START);
 914
 915         rec_log(CL_CONNECT, "");
 916 }
 917
 918
 919 void citproto_begin_session() {
 920         if (CC->nologin==1) {
 921                 cprintf("%d %s: Too many users are already online "
 922                         "(maximum is %d)\n",
 923                         ERROR+MAX_SESSIONS_EXCEEDED,
 924                         config.c_nodename, config.c_maxsessions);
 925                 }
 926         else {
 927                 cprintf("%d %s Citadel/UX server ready.\n",
 928                         OK, config.c_nodename);
 929                 }
 930 }
 931
 932
 933
 934
 935 /*
 936  * This loop recognizes all server commands.
 937  */
 938 void do_command_loop(void) {
 939         char cmdbuf[256];
 940
 941         time(&CC->lastcmd);
 942         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 943         if (client_gets(cmdbuf) < 1) {
 944                 lprintf(3, "Client socket is broken.  Ending session.\n");
 945                 CC->kill_me = 1;
 946                 return;
 947         }
 948         lprintf(5, "citserver[%3d]: %s\n", CC->cs_pid, cmdbuf);
 949
 950         /*
 951          * Let other clients see the last command we executed, and
 952          * update the idle time, but not NOOP, PEXP, or GEXP.
 953          */
 954         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 955            && (strncasecmp(cmdbuf, "PEXP", 4))
 956            && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
 957                 strcpy(CC->lastcmdname, "    ");
 958                 safestrncpy(CC->lastcmdname, cmdbuf,
 959                         sizeof(CC->lastcmdname) );
 960                 time(&CC->lastidle);
 961                 }
 962
 963         if ((strncasecmp(cmdbuf, "ENT0", 4))
 964            && (strncasecmp(cmdbuf, "MESG", 4))
 965            && (strncasecmp(cmdbuf, "MSGS", 4)))
 966         {
 967            CC->cs_flags &= ~CS_POSTING;
 968         }
 969
 970         if (!strncasecmp(cmdbuf,"NOOP",4)) {
 971                 cprintf("%d%cok\n",OK,check_express());
 972                 }
 973
 974         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 975                 cprintf("%d Goodbye.\n",OK);
 976                 CC->kill_me = 1;
 977                 }
 978
 979         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 980                 if (CC->logged_in) logout(CC);
 981                 cprintf("%d logged out.\n",OK);
 982                 }
 983
 984         else if (!strncasecmp(cmdbuf,"USER",4)) {
 985                 cmd_user(&cmdbuf[5]);
 986                 }
 987
 988         else if (!strncasecmp(cmdbuf,"PASS",4)) {
 989                 cmd_pass(&cmdbuf[5]);
 990                 }
 991
 992         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 993                 cmd_newu(&cmdbuf[5]);
 994                 }
 995
 996         else if (!strncasecmp(cmdbuf,"SETP",4)) {
 997                 cmd_setp(&cmdbuf[5]);
 998                 }
 999
1000         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
1001                 cmd_lrms(&cmdbuf[5]);
1002                 }
1003
1004         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
1005                 cmd_lkra(&cmdbuf[5]);
1006                 }
1007
1008         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
1009                 cmd_lkrn(&cmdbuf[5]);
1010                 }
1011
1012         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
1013                 cmd_lkro(&cmdbuf[5]);
1014                 }
1015
1016         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
1017                 cmd_lzrm(&cmdbuf[5]);
1018                 }
1019
1020         else if (!strncasecmp(cmdbuf,"GETU",4)) {
1021                 cmd_getu();
1022                 }
1023
1024         else if (!strncasecmp(cmdbuf,"SETU",4)) {
1025                 cmd_setu(&cmdbuf[5]);
1026                 }
1027
1028         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
1029                 cmd_goto(&cmdbuf[5]);
1030                 }
1031
1032         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
1033                 cmd_msgs(&cmdbuf[5]);
1034                 }
1035
1036         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
1037                 cmd_whok();
1038                 }
1039
1040         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
1041                 cmd_rdir();
1042                 }
1043
1044         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
1045                 cmd_msg0(&cmdbuf[5]);
1046                 }
1047
1048         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
1049                 cmd_msg2(&cmdbuf[5]);
1050                 }
1051
1052         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
1053                 cmd_msg3(&cmdbuf[5]);
1054                 }
1055
1056         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
1057                 cmd_msg4(&cmdbuf[5]);
1058                 }
1059
1060         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
1061                 cmd_opna(&cmdbuf[5]);
1062                 }
1063
1064         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1065                 cmd_info();
1066                 }
1067
1068         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1069                 cmd_slrp(&cmdbuf[5]);
1070                 }
1071
1072         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1073                 cmd_invt_kick(&cmdbuf[5],1);
1074                 }
1075
1076         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1077                 cmd_invt_kick(&cmdbuf[5],0);
1078                 }
1079
1080         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1081                 cmd_getr();
1082                 }
1083
1084         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1085                 cmd_setr(&cmdbuf[5]);
1086                 }
1087
1088         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1089                 cmd_geta();
1090                 }
1091
1092         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1093                 cmd_seta(&cmdbuf[5]);
1094                 }
1095
1096         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1097                 cmd_ent0(&cmdbuf[5]);
1098                 }
1099
1100         else if (!strncasecmp(cmdbuf,"ENT3",4)) {
1101                 cmd_ent3(&cmdbuf[5]);
1102                 }
1103
1104         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1105                 cmd_rinf();
1106                 }
1107
1108         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1109                 cmd_dele(&cmdbuf[5]);
1110                 }
1111
1112         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1113                 cmd_kill(&cmdbuf[5]);
1114                 }
1115
1116         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1117                 cmd_cre8(&cmdbuf[5]);
1118                 }
1119
1120         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1121                 cmd_move(&cmdbuf[5]);
1122                 }
1123
1124         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1125                 cmd_forg();
1126                 }
1127
1128         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1129                 cmd_mesg(&cmdbuf[5]);
1130                 }
1131
1132         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1133                 cmd_emsg(&cmdbuf[5]);
1134                 }
1135
1136         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1137                 cmd_gnur();
1138                 }
1139
1140         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1141                 cmd_vali(&cmdbuf[5]);
1142                 }
1143
1144         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1145                 cmd_einf(&cmdbuf[5]);
1146                 }
1147
1148         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1149                 cmd_list();
1150                 }
1151
1152         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1153                 cmd_chek();
1154                 }
1155
1156         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1157                 cmd_delf(&cmdbuf[5]);
1158                 }
1159
1160         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1161                 cmd_movf(&cmdbuf[5]);
1162                 }
1163
1164         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1165                 cmd_netf(&cmdbuf[5]);
1166                 }
1167
1168         else if (!strncasecmp(cmdbuf,"RWHO",4)) {
1169                 cmd_rwho();
1170                 }
1171
1172         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1173                 cmd_open(&cmdbuf[5]);
1174                 }
1175
1176         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1177                 cmd_clos();
1178                 }
1179
1180         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1181                 cmd_uopn(&cmdbuf[5]);
1182                 }
1183
1184         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1185                 cmd_ucls(&cmdbuf[5]);
1186                 }
1187
1188         else if (!strncasecmp(cmdbuf,"READ",4)) {
1189                 cmd_read(&cmdbuf[5]);
1190                 }
1191
1192         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1193                 cmd_writ(&cmdbuf[5]);
1194                 }
1195
1196         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1197                 cmd_qusr(&cmdbuf[5]);
1198                 }
1199
1200         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1201                 cmd_echo(&cmdbuf[5]);
1202                 }
1203
1204         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1205                 cmd_oimg(&cmdbuf[5]);
1206                 }
1207
1208         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1209                 cmd_more();
1210                 }
1211
1212         else if (!strncasecmp(cmdbuf,"NETP",4)) {
1213                 cmd_netp(&cmdbuf[5]);
1214                 }
1215
1216         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1217                 cmd_ndop(&cmdbuf[5]);
1218                 }
1219
1220         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1221                 cmd_nuop(&cmdbuf[5]);
1222                 }
1223
1224         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1225                 cmd_lflr();
1226                 }
1227
1228         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1229                 cmd_cflr(&cmdbuf[5]);
1230                 }
1231
1232         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1233                 cmd_kflr(&cmdbuf[5]);
1234                 }
1235
1236         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1237                 cmd_eflr(&cmdbuf[5]);
1238                 }
1239
1240         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1241                 cmd_iden(&cmdbuf[5]);
1242                 }
1243
1244         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1245                 cmd_ipgm(&cmdbuf[5]);
1246                 }
1247
1248         else if (!strncasecmp(cmdbuf,"EBIO",4)) {
1249                 cmd_ebio();
1250                 }
1251
1252         else if (!strncasecmp(cmdbuf,"RBIO",4)) {
1253                 cmd_rbio(&cmdbuf[5]);
1254                 }
1255
1256         else if (!strncasecmp(cmdbuf,"LBIO",4)) {
1257                 cmd_lbio();
1258                 }
1259
1260         else if (!strncasecmp(cmdbuf,"STEL",4)) {
1261                 cmd_stel(&cmdbuf[5]);
1262                 }
1263
1264         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1265                 cmd_term(&cmdbuf[5]);
1266                 }
1267
1268         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1269                 cmd_down();
1270                 }
1271
1272         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1273                 cmd_scdn(&cmdbuf[5]);
1274                 }
1275
1276         else if (!strncasecmp(cmdbuf, "NSET", 4)) {
1277                 cmd_nset(&cmdbuf[5]);
1278                 }
1279
1280         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1281                 cmd_uimg(&cmdbuf[5]);
1282                 }
1283
1284         else if (!strncasecmp(cmdbuf, "UCHG", 4)) {
1285                 cmd_uchg(&cmdbuf[5]);
1286                 }
1287
1288         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1289                 cmd_time();
1290                 }
1291
1292         else if (!strncasecmp(cmdbuf, "HCHG", 4)) {
1293                 cmd_hchg(&cmdbuf[5]);
1294                 }
1295
1296         else if (!strncasecmp(cmdbuf, "RCHG", 4)) {
1297                 cmd_rchg(&cmdbuf[5]);
1298                 }
1299
1300         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1301                 cmd_agup(&cmdbuf[5]);
1302                 }
1303
1304         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1305                 cmd_asup(&cmdbuf[5]);
1306                 }
1307
1308         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1309                 cmd_gpex(&cmdbuf[5]);
1310                 }
1311
1312         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1313                 cmd_spex(&cmdbuf[5]);
1314                 }
1315
1316         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1317                 cmd_conf(&cmdbuf[5]);
1318                 }
1319
1320 #ifdef DEBUG_MEMORY_LEAKS
1321         else if (!strncasecmp(cmdbuf, "LEAK", 4)) {
1322                 dump_tracked();
1323                 }
1324 #endif
1325
1326         else if (!DLoader_Exec_Cmd(cmdbuf))
1327                 {
1328                    cprintf("%d Unrecognized or unsupported command.\n",
1329                             ERROR);
1330                 }
1331
1332         /* Run any after-each-command outines registered by modules */
1333         PerformSessionHooks(EVT_CMD);
1334 }