citadel/citserver.c

   1 /*
   2  * $Id$
   3  *
   4  * Main source module for the Citadel server
   5  *
   6  */
   7
   8 #ifdef DLL_EXPORT
   9 #define IN_LIBCIT
  10 #endif
  11
  12 #include "sysdep.h"
  13 #include <stdlib.h>
  14 #include <unistd.h>
  15 #include <stdio.h>
  16 #include <fcntl.h>
  17 #include <signal.h>
  18 #include <sys/types.h>
  19 #include <sys/stat.h>
  20
  21
  22 #if TIME_WITH_SYS_TIME
  23 # include <sys/time.h>
  24 # include <time.h>
  25 #else
  26 # if HAVE_SYS_TIME_H
  27 #  include <sys/time.h>
  28 # else
  29 #  include <time.h>
  30 # endif
  31 #endif
  32
  33 #include <ctype.h>
  34 #include <string.h>
  35 #include <errno.h>
  36 #include <limits.h>
  37 /* #include <dlfcn.h> */
  38 #include <netdb.h>
  39 #include <sys/types.h>
  40 #include <sys/socket.h>
  41 #include <netinet/in.h>
  42 #include <arpa/inet.h>
  43 #include "citadel.h"
  44 #include "server.h"
  45 #include "serv_extensions.h"
  46 #include "sysdep_decls.h"
  47 #include "citserver.h"
  48 #include "config.h"
  49 #include "database.h"
  50 #include "housekeeping.h"
  51 #include "user_ops.h"
  52 #include "msgbase.h"
  53 #include "support.h"
  54 #include "locate_host.h"
  55 #include "room_ops.h"
  56 #include "file_ops.h"
  57 #include "policy.h"
  58 #include "control.h"
  59 #include "tools.h"
  60
  61 #ifndef HAVE_SNPRINTF
  62 #include "snprintf.h"
  63 #endif
  64
  65 struct CitContext *ContextList = NULL;
  66 struct CitContext* next_session = NULL;
  67 char *unique_session_numbers;
  68 int ScheduledShutdown = 0;
  69 int do_defrag = 0;
  70 time_t server_startup_time;
  71 char pid_file_name[PATH_MAX];
  72
  73 /*
  74  * Various things that need to be initialized at startup
  75  */
  76 void master_startup(void) {
  77         struct timeval tv;
  78         unsigned int seed;
  79         FILE *urandom;
  80         struct ctdlroom qrbuf;
  81         FILE *pidfile_fp;
  82
  83         lprintf(CTDL_DEBUG, "master_startup() started\n");
  84         time(&server_startup_time);
  85
  86         /* pid file.  If we go FSSTND this should end up in 'localstatedir' */
  87         snprintf(pid_file_name, sizeof pid_file_name, "./citadel.pid");
  88         pidfile_fp = fopen(pid_file_name, "w");
  89         if (pidfile_fp != NULL) {
  90                 fprintf(pidfile_fp, "%d\n", (int)getpid());
  91                 fclose(pidfile_fp);
  92         }
  93
  94         lprintf(CTDL_INFO, "Opening databases\n");
  95         open_databases();
  96
  97         if (do_defrag) {
  98                 defrag_databases();
  99         }
 100
 101         check_ref_counts();
 102
 103         lprintf(CTDL_INFO, "Creating base rooms (if necessary)\n");
 104         create_room(BASEROOM,           0, "", 0, 1, 0, VIEW_BBS);
 105         create_room(AIDEROOM,           3, "", 0, 1, 0, VIEW_BBS);
 106         create_room(SYSCONFIGROOM,      3, "", 0, 1, 0, VIEW_BBS);
 107         create_room(config.c_twitroom,  0, "", 0, 1, 0, VIEW_BBS);
 108
 109         /* The "Local System Configuration" room doesn't need to be visible */
 110         if (lgetroom(&qrbuf, SYSCONFIGROOM) == 0) {
 111                 qrbuf.QRflags2 |= QR2_SYSTEM;
 112                 lputroom(&qrbuf);
 113         }
 114
 115         lprintf(CTDL_INFO, "Seeding the pseudo-random number generator...\n");
 116         urandom = fopen("/dev/urandom", "r");
 117         if (urandom != NULL) {
 118                 fread(&seed, sizeof seed, 1, urandom);
 119                 fclose(urandom);
 120         }
 121         else {
 122                 gettimeofday(&tv, NULL);
 123                 seed = tv.tv_usec;
 124         }
 125         srandom(seed);
 126
 127         lprintf(CTDL_INFO, "Initializing ipgm secret\n");
 128         get_config();
 129         config.c_ipgm_secret = rand();
 130         put_config();
 131
 132         lprintf(CTDL_DEBUG, "master_startup() finished\n");
 133 }
 134
 135
 136 /*
 137  * Cleanup routine to be called when the server is shutting down.
 138  */
 139 void master_cleanup(int exitcode) {
 140         struct CleanupFunctionHook *fcn;
 141         static int already_cleaning_up = 0;
 142
 143         if (already_cleaning_up) while(1) sleep(1);
 144         already_cleaning_up = 1;
 145
 146         /* Run any cleanup routines registered by loadable modules */
 147         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
 148                 (*fcn->h_function_pointer)();
 149         }
 150
 151         /* Close databases */
 152         lprintf(CTDL_INFO, "Closing databases\n");
 153         close_databases();
 154
 155         /* Do system-dependent stuff */
 156         sysdep_master_cleanup();
 157
 158 #ifdef DEBUG_MEMORY_LEAKS
 159         dump_heap();
 160 #endif
 161
 162         /* Now go away. */
 163         lprintf(CTDL_NOTICE, "citserver: Exiting with status %d\n", exitcode);
 164         fflush(stdout); fflush(stderr);
 165
 166         unlink(pid_file_name);
 167         exit(exitcode);
 168 }
 169
 170
 171
 172 /*
 173  * Terminate a session and remove its context data structure.
 174  */
 175 void RemoveContext (struct CitContext *con)
 176 {
 177         if (con==NULL) {
 178                 lprintf(CTDL_ERR, "WARNING: RemoveContext() called with NULL!\n");
 179                 return;
 180         }
 181         lprintf(CTDL_DEBUG, "RemoveContext() called\n");
 182
 183         /* Remove the context from the global context list.  This needs
 184          * to get done FIRST to avoid concurrency problems.  It is *vitally*
 185          * important to keep num_sessions accurate!!
 186          */
 187         lprintf(CTDL_DEBUG, "Removing context for session %d\n", con->cs_pid);
 188         begin_critical_section(S_SESSION_TABLE);
 189         if (con->prev) {
 190                 con->prev->next = con->next;
 191         }
 192         else {
 193                 ContextList = con->next;
 194         }
 195         if (con->next) {
 196                 con->next->prev = con->prev;
 197         }
 198         --num_sessions;
 199         end_critical_section(S_SESSION_TABLE);
 200
 201         /* Run any cleanup routines registered by loadable modules.
 202          * Note: We have to "become_session()" because the cleanup functions
 203          *       might make references to "CC" assuming it's the right one.
 204          */
 205         become_session(con);
 206         PerformSessionHooks(EVT_STOP);
 207         become_session(NULL);
 208
 209         /* Now handle all of the administrivia. */
 210         lprintf(CTDL_DEBUG, "Calling logout(%d)\n", con->cs_pid);
 211         logout(con);
 212
 213         unlink(con->temp);
 214         lprintf(CTDL_NOTICE, "[%3d] Session ended.\n", con->cs_pid);
 215
 216         /* If the client is still connected, blow 'em away. */
 217         lprintf(CTDL_DEBUG, "Closing socket %d\n", con->client_socket);
 218         close(con->client_socket);
 219
 220         /* This is where we used to check for scheduled shutdowns. */
 221
 222         /* Free up the memory used by this context */
 223         free(con);
 224
 225         lprintf(CTDL_DEBUG, "Done with RemoveContext()\n");
 226 }
 227
 228
 229
 230
 231
 232 /*
 233  * cmd_info()  -  tell the client about this server
 234  */
 235 void cmd_info(void) {
 236         cprintf("%d Server info:\n", LISTING_FOLLOWS);
 237         cprintf("%d\n", CC->cs_pid);
 238         cprintf("%s\n", config.c_nodename);
 239         cprintf("%s\n", config.c_humannode);
 240         cprintf("%s\n", config.c_fqdn);
 241         cprintf("%s\n", CITADEL);
 242         cprintf("%d\n", REV_LEVEL);
 243         cprintf("%s\n", config.c_bbs_city);
 244         cprintf("%s\n", config.c_sysadm);
 245         cprintf("%d\n", SERVER_TYPE);
 246         cprintf("%s\n", config.c_moreprompt);
 247         cprintf("1\n"); /* 1 = yes, this system supports floors */
 248         cprintf("1\n"); /* 1 = we support the extended paging options */
 249         cprintf("%s\n", CC->cs_nonce);
 250         cprintf("1\n"); /* 1 = yes, this system supports the QNOP command */
 251 #ifdef HAVE_LDAP
 252         cprintf("1\n"); /* 1 = yes, this server is LDAP-enabled */
 253 #else
 254         cprintf("0\n"); /* 1 = no, this server is not LDAP-enabled */
 255 #endif
 256         cprintf("000\n");
 257 }
 258
 259
 260 /*
 261  * returns an asterisk if there are any instant messages waiting,
 262  * space otherwise.
 263  */
 264 char CtdlCheckExpress(void) {
 265         if (CC->FirstExpressMessage == NULL) {
 266                 return(' ');
 267         }
 268         else {
 269                 return('*');
 270         }
 271 }
 272
 273 void cmd_time(void)
 274 {
 275    time_t tv;
 276    struct tm tmp;
 277
 278    tv = time(NULL);
 279    localtime_r(&tv, &tmp);
 280
 281    /* timezone and daylight global variables are not portable. */
 282 #ifdef HAVE_STRUCT_TM_TM_GMTOFF
 283    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, tmp.tm_gmtoff, tmp.tm_isdst);
 284 #else
 285    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, timezone, tmp.tm_isdst);
 286 #endif
 287 }
 288
 289
 290 /*
 291  * Check originating host against the public_clients file.  This determines
 292  * whether the client is allowed to change the hostname for this session
 293  * (for example, to show the location of the user rather than the location
 294  * of the client).
 295  */
 296 int is_public_client(void)
 297 {
 298         char buf[SIZ];
 299         char addrbuf[SIZ];
 300         FILE *fp;
 301         int i;
 302         struct stat statbuf;
 303         static time_t pc_timestamp = 0;
 304         static char public_clients[SIZ];
 305
 306 #define PUBLIC_CLIENTS "./public_clients"
 307
 308         /*
 309          * Check the time stamp on the public_clients file.  If it's been
 310          * updated since the last time we were here (or if this is the first
 311          * time we've been through the loop), read its contents and learn
 312          * the IP addresses of the listed hosts.
 313          */
 314         if (stat(PUBLIC_CLIENTS, &statbuf) != 0) {
 315                 /* No public_clients file exists, so bail out */
 316                 lprintf(CTDL_WARNING, "Warning: '%s' does not exist\n", PUBLIC_CLIENTS);
 317                 return(0);
 318         }
 319
 320         if (statbuf.st_mtime > pc_timestamp) {
 321                 begin_critical_section(S_PUBLIC_CLIENTS);
 322                 lprintf(CTDL_INFO, "Loading %s\n", PUBLIC_CLIENTS);
 323
 324                 strcpy(public_clients, "127.0.0.1");
 325                 if (hostname_to_dotted_quad(addrbuf, config.c_fqdn) == 0) {
 326                         strcat(public_clients, "|");
 327                         strcat(public_clients, addrbuf);
 328                 }
 329
 330                 fp = fopen("public_clients", "r");
 331                 if (fp != NULL) while (fgets(buf, sizeof buf, fp)!=NULL) {
 332                         for (i=0; i<strlen(buf); ++i) {
 333                                 if (buf[i] == '#') buf[i] = 0;
 334                         }
 335                         while (isspace((buf[strlen(buf)-1]))) {
 336                                 buf[strlen(buf)-1] = 0;
 337                         }
 338                         if (hostname_to_dotted_quad(addrbuf, buf) == 0) {
 339                                 if ((strlen(public_clients) +
 340                                    strlen(addrbuf) + 2)
 341                                    < sizeof(public_clients)) {
 342                                         strcat(public_clients, addrbuf);
 343                                 }
 344                         }
 345                 }
 346                 fclose(fp);
 347                 pc_timestamp = time(NULL);
 348                 end_critical_section(S_PUBLIC_CLIENTS);
 349         }
 350
 351         lprintf(CTDL_DEBUG, "Checking whether %s is a local or public client\n",
 352                 CC->cs_addr);
 353         for (i=0; i<num_parms(public_clients); ++i) {
 354                 extract(addrbuf, public_clients, i);
 355                 if (!strcasecmp(CC->cs_addr, addrbuf)) {
 356                         lprintf(CTDL_DEBUG, "... yes it is.\n");
 357                         return(1);
 358                 }
 359         }
 360
 361         /* No hits.  This is not a public client. */
 362         lprintf(CTDL_DEBUG, "... no it isn't.\n");
 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[SIZ];
 376         char from_host[SIZ];
 377         struct in_addr addr;
 378         int do_lookup = 0;
 379
 380         if (num_parms(argbuf)<4) {
 381                 cprintf("%d usage error\n", ERROR + ILLEGAL_VALUE);
 382                 return;
 383         }
 384
 385         dev_code = extract_int(argbuf,0);
 386         cli_code = extract_int(argbuf,1);
 387         rev_level = extract_int(argbuf,2);
 388         extract(desc,argbuf,3);
 389
 390         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 391         from_host[sizeof from_host - 1] = 0;
 392         if (num_parms(argbuf)>=5) extract(from_host,argbuf,4);
 393
 394         CC->cs_clientdev = dev_code;
 395         CC->cs_clienttyp = cli_code;
 396         CC->cs_clientver = rev_level;
 397         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 398         CC->cs_clientname[31] = 0;
 399
 400         if (strlen(from_host) > 0) {
 401                 if (CC->is_local_socket) do_lookup = 1;
 402                 else if (is_public_client()) do_lookup = 1;
 403         }
 404
 405         if (do_lookup) {
 406                 lprintf(CTDL_DEBUG, "Looking up hostname '%s'\n", from_host);
 407                 if ((addr.s_addr = inet_addr(from_host)) != -1) {
 408                         locate_host(CC->cs_host, sizeof CC->cs_host,
 409                                 NULL, 0,
 410                                 &addr);
 411                 }
 412                 else {
 413                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 414                         CC->cs_host[sizeof CC->cs_host - 1] = 0;
 415                 }
 416         }
 417
 418         lprintf(CTDL_NOTICE, "Client %d/%d/%01d.%02d (%s) from %s\n",
 419                 dev_code,
 420                 cli_code,
 421                 (rev_level / 100),
 422                 (rev_level % 100),
 423                 desc,
 424                 CC->cs_host);
 425         cprintf("%d Ok\n",CIT_OK);
 426 }
 427
 428
 429 /*
 430  * display system messages or help
 431  */
 432 void cmd_mesg(char *mname)
 433 {
 434         FILE *mfp;
 435         char targ[SIZ];
 436         char buf[SIZ];
 437         char buf2[SIZ];
 438         char *dirs[2];
 439
 440         extract(buf,mname,0);
 441
 442         dirs[0]=malloc(64);
 443         dirs[1]=malloc(64);
 444         strcpy(dirs[0],"messages");
 445         strcpy(dirs[1],"help");
 446         snprintf(buf2, sizeof buf2, "%s.%d.%d", buf, CC->cs_clientdev, CC->cs_clienttyp);
 447         mesg_locate(targ,sizeof targ,buf2,2,(const char **)dirs);
 448         if (strlen(targ) == 0) {
 449                 snprintf(buf2, sizeof buf2, "%s.%d", buf, CC->cs_clientdev);
 450                 mesg_locate(targ,sizeof targ,buf2,2,(const char **)dirs);
 451                 if (strlen(targ) == 0) {
 452                         mesg_locate(targ,sizeof targ,buf,2,(const char **)dirs);
 453                 }
 454         }
 455         free(dirs[0]);
 456         free(dirs[1]);
 457
 458         if (strlen(targ)==0) {
 459                 cprintf("%d '%s' not found.\n",ERROR + FILE_NOT_FOUND, mname);
 460                 return;
 461         }
 462
 463         mfp = fopen(targ,"r");
 464         if (mfp==NULL) {
 465                 cprintf("%d Cannot open '%s': %s\n",
 466                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
 467                 return;
 468         }
 469         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
 470
 471         while (fgets(buf, (SIZ-1), mfp)!=NULL) {
 472                 buf[strlen(buf)-1] = 0;
 473                 do_help_subst(buf);
 474                 cprintf("%s\n",buf);
 475         }
 476
 477         fclose(mfp);
 478         cprintf("000\n");
 479 }
 480
 481
 482 /*
 483  * enter system messages or help
 484  */
 485 void cmd_emsg(char *mname)
 486 {
 487         FILE *mfp;
 488         char targ[SIZ];
 489         char buf[SIZ];
 490         char *dirs[2];
 491         int a;
 492
 493         unbuffer_output();
 494
 495         if (CtdlAccessCheck(ac_aide)) return;
 496
 497         extract(buf,mname,0);
 498         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 499                 if (buf[a] == '/') buf[a] = '.';
 500         }
 501
 502         dirs[0]=malloc(64);
 503         dirs[1]=malloc(64);
 504         strcpy(dirs[0],"messages");
 505         strcpy(dirs[1],"help");
 506         mesg_locate(targ,sizeof targ,buf,2,(const char**)dirs);
 507         free(dirs[0]);
 508         free(dirs[1]);
 509
 510         if (strlen(targ)==0) {
 511                 snprintf(targ, sizeof targ, "./help/%s", buf);
 512         }
 513
 514         mfp = fopen(targ,"w");
 515         if (mfp==NULL) {
 516                 cprintf("%d Cannot open '%s': %s\n",
 517                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
 518                 return;
 519         }
 520         cprintf("%d %s\n", SEND_LISTING, targ);
 521
 522         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 523                 fprintf(mfp, "%s\n", buf);
 524         }
 525
 526         fclose(mfp);
 527 }
 528
 529
 530 /* Don't show the names of private rooms unless the viewing
 531  * user also knows the rooms.
 532  */
 533 void GenerateRoomDisplay(char *real_room,
 534                         struct CitContext *viewed,
 535                         struct CitContext *viewer) {
 536
 537         int ra;
 538
 539         strcpy(real_room, viewed->room.QRname);
 540         if (viewed->room.QRflags & QR_MAILBOX) {
 541                 strcpy(real_room, &real_room[11]);
 542         }
 543         if (viewed->room.QRflags & QR_PRIVATE) {
 544                 CtdlRoomAccess(&viewed->room, &viewer->user, &ra, NULL);
 545                 if ( (ra & UA_KNOWN) == 0) {
 546                         strcpy(real_room, "<private room>");
 547                 }
 548         }
 549
 550         if (viewed->cs_flags & CS_CHAT) {
 551                 while (strlen(real_room) < 14)
 552                         strcat(real_room, " ");
 553
 554                 strcpy(&real_room[14], "<chat>");
 555         }
 556
 557 }
 558
 559 /*
 560  * Convenience function.
 561  */
 562 int CtdlAccessCheck(int required_level) {
 563
 564         if (CC->internal_pgm) return(0);
 565         if (required_level >= ac_internal) {
 566                 cprintf("%d This is not a user-level command.\n",
 567                         ERROR + HIGHER_ACCESS_REQUIRED);
 568                 return(-1);
 569         }
 570
 571         if ((required_level >= ac_logged_in) && (CC->logged_in == 0)) {
 572                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 573                 return(-1);
 574         }
 575
 576         if (CC->user.axlevel >= 6) return(0);
 577         if (required_level >= ac_aide) {
 578                 cprintf("%d This command requires Aide access.\n",
 579                         ERROR + HIGHER_ACCESS_REQUIRED);
 580                 return(-1);
 581         }
 582
 583         if (is_room_aide()) return(0);
 584         if (required_level >= ac_room_aide) {
 585                 cprintf("%d This command requires Aide or Room Aide access.\n",
 586                         ERROR + HIGHER_ACCESS_REQUIRED);
 587                 return(-1);
 588         }
 589
 590         /* shhh ... succeed quietly */
 591         return(0);
 592 }
 593
 594
 595
 596 /*
 597  * Terminate another running session
 598  */
 599 void cmd_term(char *cmdbuf)
 600 {
 601         int session_num;
 602         struct CitContext *ccptr;
 603         int found_it = 0;
 604         int allowed = 0;
 605
 606         session_num = extract_int(cmdbuf, 0);
 607         if (session_num == CC->cs_pid) {
 608                 cprintf("%d You can't kill your own session.\n", ERROR + ILLEGAL_VALUE);
 609                 return;
 610         }
 611
 612         lprintf(CTDL_DEBUG, "Locating session to kill\n");
 613         begin_critical_section(S_SESSION_TABLE);
 614         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 615                 if (session_num == ccptr->cs_pid) {
 616                         found_it = 1;
 617                         if ((ccptr->user.usernum == CC->user.usernum)
 618                            || (CC->user.axlevel >= 6)) {
 619                                 allowed = 1;
 620                                 ccptr->kill_me = 1;
 621                         }
 622                         else {
 623                                 allowed = 0;
 624                         }
 625                 }
 626         }
 627         end_critical_section(S_SESSION_TABLE);
 628
 629         if (found_it) {
 630                 if (allowed) {
 631                         cprintf("%d Session terminated.\n", CIT_OK);
 632                 }
 633                 else {
 634                         cprintf("%d You are not allowed to do that.\n",
 635                                 ERROR + HIGHER_ACCESS_REQUIRED);
 636                 }
 637         }
 638         else {
 639                 cprintf("%d No such session.\n", ERROR + ILLEGAL_VALUE);
 640         }
 641 }
 642
 643
 644
 645
 646
 647 /*
 648  * get the paginator prompt
 649  */
 650 void cmd_more(void) {
 651         cprintf("%d %s\n", CIT_OK, config.c_moreprompt);
 652 }
 653
 654 /*
 655  * echo
 656  */
 657 void cmd_echo(char *etext)
 658 {
 659         cprintf("%d %s\n", CIT_OK, etext);
 660 }
 661
 662
 663
 664 /*
 665  * identify as internal program
 666  */
 667 void cmd_ipgm(char *argbuf)
 668 {
 669         int secret;
 670
 671         secret = extract_int(argbuf, 0);
 672
 673         /* For security reasons, we do NOT allow this command to run
 674          * over the network.  Local sockets only.
 675          */
 676         if (!CC->is_local_socket) {
 677                 sleep(5);
 678                 cprintf("%d Authentication failed.\n",
 679                         ERROR + PASSWORD_REQUIRED);
 680         }
 681         else if (secret == config.c_ipgm_secret) {
 682                 CC->internal_pgm = 1;
 683                 strcpy(CC->curr_user, "<internal program>");
 684                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 685                 cprintf("%d Authenticated as an internal program.\n", CIT_OK);
 686         }
 687         else {
 688                 sleep(5);
 689                 cprintf("%d Authentication failed.\n",
 690                         ERROR + PASSWORD_REQUIRED);
 691                 lprintf(CTDL_ERR, "Warning: ipgm authentication failed.\n");
 692                 CC->kill_me = 1;
 693         }
 694
 695         /* Now change the ipgm secret for the next round.
 696          * (Disabled because it breaks concurrent scripts.  The fact that
 697          * we no longer accept IPGM over the network should be sufficient
 698          * to prevent brute-force attacks.  If you don't agree, uncomment
 699          * this block.)
 700         get_config();
 701         config.c_ipgm_secret = rand();
 702         put_config();
 703         */
 704 }
 705
 706
 707 /*
 708  * Shut down the server
 709  */
 710 void cmd_down(void) {
 711
 712         if (CtdlAccessCheck(ac_aide)) return;
 713
 714         cprintf("%d Shutting down server.  Goodbye.\n", CIT_OK);
 715         time_to_die = 1;
 716 }
 717
 718 /*
 719  * Schedule or cancel a server shutdown
 720  */
 721 void cmd_scdn(char *argbuf)
 722 {
 723         int new_state;
 724
 725         if (CtdlAccessCheck(ac_aide)) return;
 726
 727         new_state = extract_int(argbuf, 0);
 728         if ((new_state == 0) || (new_state == 1)) {
 729                 ScheduledShutdown = new_state;
 730         }
 731         cprintf("%d %d\n", CIT_OK, ScheduledShutdown);
 732 }
 733
 734
 735 /*
 736  * Set or unset asynchronous protocol mode
 737  */
 738 void cmd_asyn(char *argbuf)
 739 {
 740         int new_state;
 741
 742         new_state = extract_int(argbuf, 0);
 743         if ((new_state == 0) || (new_state == 1)) {
 744                 CC->is_async = new_state;
 745         }
 746         cprintf("%d %d\n", CIT_OK, CC->is_async);
 747 }
 748
 749
 750 /*
 751  * Generate a "nonce" for APOP-style authentication.
 752  *
 753  * RFC 1725 et al specify a PID to be placed in front of the nonce.
 754  * Quoth BTX: That would be stupid.
 755  */
 756 void generate_nonce(struct CitContext *con) {
 757         struct timeval tv;
 758
 759         memset(con->cs_nonce, NONCE_SIZE, 0);
 760         gettimeofday(&tv, NULL);
 761         memset(con->cs_nonce, NONCE_SIZE, 0);
 762         snprintf(con->cs_nonce, NONCE_SIZE, "<%d%ld@%s>",
 763                 rand(), (long)tv.tv_usec, config.c_fqdn);
 764 }
 765
 766
 767
 768
 769 /*
 770  * Back-end function for starting a session
 771  */
 772 void begin_session(struct CitContext *con)
 773 {
 774         int len;
 775         struct sockaddr_in sin;
 776
 777         /*
 778          * Initialize some variables specific to our context.
 779          */
 780         con->logged_in = 0;
 781         con->internal_pgm = 0;
 782         con->download_fp = NULL;
 783         con->upload_fp = NULL;
 784         con->FirstExpressMessage = NULL;
 785         time(&con->lastcmd);
 786         time(&con->lastidle);
 787         strcpy(con->lastcmdname, "    ");
 788         strcpy(con->cs_clientname, "(unknown)");
 789         strcpy(con->curr_user, NLI);
 790         strcpy(con->net_node,"");
 791         strcpy(con->fake_username, "");
 792         strcpy(con->fake_postname, "");
 793         strcpy(con->fake_hostname, "");
 794         strcpy(con->fake_roomname, "");
 795         generate_nonce(con);
 796         safestrncpy(con->temp, tmpnam(NULL), sizeof con->temp);
 797         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 798         safestrncpy(con->cs_addr, "", sizeof con->cs_addr);
 799         con->cs_host[sizeof con->cs_host - 1] = 0;
 800         len = sizeof sin;
 801         if (!CC->is_local_socket) {
 802                 if (!getpeername(con->client_socket,
 803                    (struct sockaddr *) &sin, &len))     /* should be socklen_t but doesn't work on Macintosh */
 804                         locate_host(con->cs_host, sizeof con->cs_host,
 805                                 con->cs_addr, sizeof con->cs_addr,
 806                                 &sin.sin_addr);
 807         }
 808         else {
 809                 strcpy(con->cs_host, "");
 810         }
 811         con->cs_flags = 0;
 812         con->upload_type = UPL_FILE;
 813         con->dl_is_net = 0;
 814
 815         con->nologin = 0;
 816         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 817                 con->nologin = 1;
 818
 819         lprintf(CTDL_NOTICE, "Session started.\n");
 820
 821         /* Run any session startup routines registered by loadable modules */
 822         PerformSessionHooks(EVT_START);
 823 }
 824
 825
 826 void citproto_begin_session() {
 827         if (CC->nologin==1) {
 828                 cprintf("%d %s: Too many users are already online "
 829                         "(maximum is %d)\n",
 830                         ERROR + MAX_SESSIONS_EXCEEDED,
 831                         config.c_nodename, config.c_maxsessions);
 832         }
 833         else {
 834                 cprintf("%d %s Citadel server ready.\n",
 835                         CIT_OK, config.c_nodename);
 836         }
 837 }
 838
 839
 840
 841
 842 /*
 843  * This loop recognizes all server commands.
 844  */
 845 void do_command_loop(void) {
 846         char cmdbuf[SIZ];
 847
 848         time(&CC->lastcmd);
 849         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 850         if (client_getln(cmdbuf, sizeof cmdbuf) < 1) {
 851                 lprintf(CTDL_ERR, "Client socket is broken; ending session\n");
 852                 CC->kill_me = 1;
 853                 return;
 854         }
 855
 856         /* Log the server command, but don't show passwords... */
 857         if ( (strncasecmp(cmdbuf, "PASS", 4))
 858            && (strncasecmp(cmdbuf, "SETP", 4)) ) {
 859                 lprintf(CTDL_INFO, "%s\n", cmdbuf);
 860         }
 861         else {
 862                 lprintf(CTDL_INFO, "<password command sent>\n");
 863         }
 864
 865         buffer_output();
 866
 867         /*
 868          * Let other clients see the last command we executed, and
 869          * update the idle time, but not NOOP, QNOP, PEXP, or GEXP.
 870          */
 871         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 872            && (strncasecmp(cmdbuf, "QNOP", 4))
 873            && (strncasecmp(cmdbuf, "PEXP", 4))
 874            && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
 875                 strcpy(CC->lastcmdname, "    ");
 876                 safestrncpy(CC->lastcmdname, cmdbuf,
 877                         sizeof(CC->lastcmdname) );
 878                 time(&CC->lastidle);
 879         }
 880
 881         if ((strncasecmp(cmdbuf, "ENT0", 4))
 882            && (strncasecmp(cmdbuf, "MESG", 4))
 883            && (strncasecmp(cmdbuf, "MSGS", 4)))
 884         {
 885            CC->cs_flags &= ~CS_POSTING;
 886         }
 887
 888         if (!strncasecmp(cmdbuf,"NOOP",4)) {
 889                 cprintf("%d%cok\n", CIT_OK, CtdlCheckExpress() );
 890         }
 891
 892         else if (!strncasecmp(cmdbuf,"QNOP",4)) {
 893                 /* do nothing, this command returns no response */
 894         }
 895
 896         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 897                 cprintf("%d Goodbye.\n", CIT_OK);
 898                 CC->kill_me = 1;
 899         }
 900
 901         else if (!strncasecmp(cmdbuf,"ASYN",4)) {
 902                 cmd_asyn(&cmdbuf[5]);
 903         }
 904
 905         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 906                 if (CC->logged_in) logout(CC);
 907                 cprintf("%d logged out.\n", CIT_OK);
 908         }
 909
 910         else if (!strncasecmp(cmdbuf,"USER",4)) {
 911                 cmd_user(&cmdbuf[5]);
 912         }
 913
 914         else if (!strncasecmp(cmdbuf,"PASS",4)) {
 915                 cmd_pass(&cmdbuf[5]);
 916         }
 917
 918         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 919                 cmd_newu(&cmdbuf[5]);
 920         }
 921
 922         else if (!strncasecmp(cmdbuf,"CREU",4)) {
 923                 cmd_creu(&cmdbuf[5]);
 924         }
 925
 926         else if (!strncasecmp(cmdbuf,"SETP",4)) {
 927                 cmd_setp(&cmdbuf[5]);
 928         }
 929
 930         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 931                 cmd_lrms(&cmdbuf[5]);
 932         }
 933
 934         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
 935                 cmd_lkra(&cmdbuf[5]);
 936         }
 937
 938         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
 939                 cmd_lkrn(&cmdbuf[5]);
 940         }
 941
 942         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
 943                 cmd_lkro(&cmdbuf[5]);
 944         }
 945
 946         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
 947                 cmd_lzrm(&cmdbuf[5]);
 948         }
 949
 950         else if (!strncasecmp(cmdbuf,"LPRM",4)) {
 951                 cmd_lprm(&cmdbuf[5]);
 952         }
 953
 954         else if (!strncasecmp(cmdbuf,"GETU",4)) {
 955                 cmd_getu();
 956         }
 957
 958         else if (!strncasecmp(cmdbuf,"SETU",4)) {
 959                 cmd_setu(&cmdbuf[5]);
 960         }
 961
 962         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
 963                 cmd_goto(&cmdbuf[5]);
 964         }
 965
 966         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
 967                 cmd_msgs(&cmdbuf[5]);
 968         }
 969
 970         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
 971                 cmd_whok();
 972         }
 973
 974         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
 975                 cmd_rdir();
 976         }
 977
 978         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
 979                 cmd_msg0(&cmdbuf[5]);
 980         }
 981
 982         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
 983                 cmd_msg2(&cmdbuf[5]);
 984         }
 985
 986         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
 987                 cmd_msg3(&cmdbuf[5]);
 988         }
 989
 990         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
 991                 cmd_msg4(&cmdbuf[5]);
 992         }
 993
 994         else if (!strncasecmp(cmdbuf,"MSGP",4)) {
 995                 cmd_msgp(&cmdbuf[5]);
 996         }
 997
 998         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
 999                 cmd_opna(&cmdbuf[5]);
1000         }
1001
1002         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1003                 cmd_info();
1004         }
1005
1006         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1007                 cmd_slrp(&cmdbuf[5]);
1008         }
1009
1010         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1011                 cmd_invt_kick(&cmdbuf[5],1);
1012         }
1013
1014         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1015                 cmd_invt_kick(&cmdbuf[5],0);
1016         }
1017
1018         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1019                 cmd_getr();
1020         }
1021
1022         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1023                 cmd_setr(&cmdbuf[5]);
1024         }
1025
1026         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1027                 cmd_geta();
1028         }
1029
1030         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1031                 cmd_seta(&cmdbuf[5]);
1032         }
1033
1034         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1035                 cmd_ent0(&cmdbuf[5]);
1036         }
1037
1038         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1039                 cmd_rinf();
1040         }
1041
1042         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1043                 cmd_dele(&cmdbuf[5]);
1044         }
1045
1046         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1047                 cmd_kill(&cmdbuf[5]);
1048         }
1049
1050         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1051                 cmd_cre8(&cmdbuf[5]);
1052         }
1053
1054         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1055                 cmd_move(&cmdbuf[5]);
1056         }
1057
1058         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1059                 cmd_forg();
1060         }
1061
1062         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1063                 cmd_mesg(&cmdbuf[5]);
1064         }
1065
1066         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1067                 cmd_emsg(&cmdbuf[5]);
1068         }
1069
1070         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1071                 cmd_gnur();
1072         }
1073
1074         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1075                 cmd_vali(&cmdbuf[5]);
1076         }
1077
1078         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1079                 cmd_einf(&cmdbuf[5]);
1080         }
1081
1082         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1083                 cmd_list();
1084         }
1085
1086         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1087                 cmd_chek();
1088         }
1089
1090         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1091                 cmd_delf(&cmdbuf[5]);
1092         }
1093
1094         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1095                 cmd_movf(&cmdbuf[5]);
1096         }
1097
1098         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1099                 cmd_netf(&cmdbuf[5]);
1100         }
1101
1102         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1103                 cmd_open(&cmdbuf[5]);
1104         }
1105
1106         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1107                 cmd_clos();
1108         }
1109
1110         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1111                 cmd_uopn(&cmdbuf[5]);
1112         }
1113
1114         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1115                 cmd_ucls(&cmdbuf[5]);
1116         }
1117
1118         else if (!strncasecmp(cmdbuf,"READ",4)) {
1119                 cmd_read(&cmdbuf[5]);
1120         }
1121
1122         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1123                 cmd_writ(&cmdbuf[5]);
1124         }
1125
1126         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1127                 cmd_qusr(&cmdbuf[5]);
1128         }
1129
1130         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1131                 cmd_echo(&cmdbuf[5]);
1132         }
1133
1134         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1135                 cmd_oimg(&cmdbuf[5]);
1136         }
1137
1138         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1139                 cmd_more();
1140         }
1141
1142         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1143                 cmd_ndop(&cmdbuf[5]);
1144         }
1145
1146         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1147                 cmd_nuop(&cmdbuf[5]);
1148         }
1149
1150         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1151                 cmd_lflr();
1152         }
1153
1154         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1155                 cmd_cflr(&cmdbuf[5]);
1156         }
1157
1158         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1159                 cmd_kflr(&cmdbuf[5]);
1160         }
1161
1162         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1163                 cmd_eflr(&cmdbuf[5]);
1164         }
1165
1166         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1167                 cmd_iden(&cmdbuf[5]);
1168         }
1169
1170         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1171                 cmd_ipgm(&cmdbuf[5]);
1172         }
1173
1174         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1175                 cmd_term(&cmdbuf[5]);
1176         }
1177
1178         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1179                 cmd_down();
1180         }
1181
1182         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1183                 cmd_scdn(&cmdbuf[5]);
1184         }
1185
1186         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1187                 cmd_uimg(&cmdbuf[5]);
1188         }
1189
1190         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1191                 cmd_time();
1192         }
1193
1194         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1195                 cmd_agup(&cmdbuf[5]);
1196         }
1197
1198         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1199                 cmd_asup(&cmdbuf[5]);
1200         }
1201
1202         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1203                 cmd_gpex(&cmdbuf[5]);
1204         }
1205
1206         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1207                 cmd_spex(&cmdbuf[5]);
1208         }
1209
1210         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1211                 cmd_conf(&cmdbuf[5]);
1212         }
1213
1214         else if (!strncasecmp(cmdbuf, "SEEN", 4)) {
1215                 cmd_seen(&cmdbuf[5]);
1216         }
1217
1218         else if (!strncasecmp(cmdbuf, "GTSN", 4)) {
1219                 cmd_gtsn(&cmdbuf[5]);
1220         }
1221
1222         else if (!strncasecmp(cmdbuf, "VIEW", 4)) {
1223                 cmd_view(&cmdbuf[5]);
1224         }
1225
1226         else if (!strncasecmp(cmdbuf, "ISME", 4)) {
1227                 cmd_isme(&cmdbuf[5]);
1228         }
1229
1230         else if (!DLoader_Exec_Cmd(cmdbuf)) {
1231                 cprintf("%d Unrecognized or unsupported command.\n",
1232                         ERROR + CMD_NOT_SUPPORTED);
1233                }
1234
1235         unbuffer_output();
1236
1237         /* Run any after-each-command routines registered by modules */
1238         PerformSessionHooks(EVT_CMD);
1239 }
1240
1241
1242 /*
1243  * This loop performs all asynchronous functions.
1244  */
1245 void do_async_loop(void) {
1246         PerformSessionHooks(EVT_ASYNC);
1247 }