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