citadel/citserver.c

   1 /*
   2  * $Id$
   3  *
   4  * Main source module for the Citadel server
   5  *
   6  */
   7
   8 #include "sysdep.h"
   9 #include <stdlib.h>
  10 #include <unistd.h>
  11 #include <stdio.h>
  12 #include <fcntl.h>
  13 #include <signal.h>
  14 #include <sys/types.h>
  15 #include <sys/stat.h>
  16
  17
  18 #if TIME_WITH_SYS_TIME
  19 # include <sys/time.h>
  20 # include <time.h>
  21 #else
  22 # if HAVE_SYS_TIME_H
  23 #  include <sys/time.h>
  24 # else
  25 #  include <time.h>
  26 # endif
  27 #endif
  28
  29 #if HAVE_BACKTRACE
  30 #include <execinfo.h>
  31 #endif
  32
  33 #include <ctype.h>
  34 #include <string.h>
  35 #include <dirent.h>
  36 #include <errno.h>
  37 #include <limits.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 "sysdep_decls.h"
  46 #include "citserver.h"
  47 #include "config.h"
  48 #include "database.h"
  49 #include "housekeeping.h"
  50 #include "user_ops.h"
  51 #include "msgbase.h"
  52 #include "support.h"
  53 #include "locate_host.h"
  54 #include "room_ops.h"
  55 #include "file_ops.h"
  56 #include "policy.h"
  57 #include "control.h"
  58 #include "tools.h"
  59 #include "euidindex.h"
  60 /*#include "serv_network.h"*/   /* Needed for destroy_network_queue_room called from master_cleanup */
  61
  62 #ifndef HAVE_SNPRINTF
  63 #include "snprintf.h"
  64 #endif
  65
  66 struct CitContext *ContextList = NULL;
  67 struct CitContext* next_session = NULL;
  68 char *unique_session_numbers;
  69 int ScheduledShutdown = 0;
  70 int do_defrag = 0;
  71 time_t server_startup_time;
  72
  73 /**
  74  * \brief print the actual stack frame.
  75  */
  76 void cit_backtrace(void)
  77 {
  78 #ifdef HAVE_BACKTRACE
  79         void *stack_frames[50];
  80         size_t size, i;
  81         char **strings;
  82
  83
  84         size = backtrace(stack_frames, sizeof(stack_frames) / sizeof(void*));
  85         strings = backtrace_symbols(stack_frames, size);
  86         for (i = 0; i < size; i++) {
  87                 if (strings != NULL)
  88                         lprintf(1, "%s\n", strings[i]);
  89                 else
  90                         lprintf(1, "%p\n", stack_frames[i]);
  91         }
  92         free(strings);
  93 #endif
  94 }
  95 /*
  96  * Various things that need to be initialized at startup
  97  */
  98 void master_startup(void) {
  99         struct timeval tv;
 100         unsigned int seed;
 101         FILE *urandom;
 102         struct ctdlroom qrbuf;
 103
 104         lprintf(CTDL_DEBUG, "master_startup() started\n");
 105         time(&server_startup_time);
 106
 107         lprintf(CTDL_INFO, "Opening databases\n");
 108         open_databases();
 109
 110         if (do_defrag) {
 111                 defrag_databases();
 112         }
 113
 114         check_ref_counts();
 115
 116         lprintf(CTDL_INFO, "Creating base rooms (if necessary)\n");
 117         create_room(config.c_baseroom,  0, "", 0, 1, 0, VIEW_BBS);
 118         create_room(AIDEROOM,           3, "", 0, 1, 0, VIEW_BBS);
 119         create_room(SYSCONFIGROOM,      3, "", 0, 1, 0, VIEW_BBS);
 120         create_room(config.c_twitroom,  0, "", 0, 1, 0, VIEW_BBS);
 121
 122         /* The "Local System Configuration" room doesn't need to be visible */
 123         if (lgetroom(&qrbuf, SYSCONFIGROOM) == 0) {
 124                 qrbuf.QRflags2 |= QR2_SYSTEM;
 125                 lputroom(&qrbuf);
 126         }
 127
 128         lprintf(CTDL_INFO, "Seeding the pseudo-random number generator...\n");
 129         urandom = fopen("/dev/urandom", "r");
 130         if (urandom != NULL) {
 131                 fread(&seed, sizeof seed, 1, urandom);
 132                 fclose(urandom);
 133         }
 134         else {
 135                 gettimeofday(&tv, NULL);
 136                 seed = tv.tv_usec;
 137         }
 138         srandom(seed);
 139
 140         lprintf(CTDL_INFO, "Initializing ipgm secret\n");
 141         get_config();
 142         config.c_ipgm_secret = rand();
 143         put_config();
 144
 145         lprintf(CTDL_DEBUG, "master_startup() finished\n");
 146 }
 147
 148
 149 /*
 150  * Cleanup routine to be called when the server is shutting down.
 151  */
 152 void master_cleanup(int exitcode) {
 153         struct CleanupFunctionHook *fcn;
 154         struct MaintenanceThreadHook *m_fcn;
 155         static int already_cleaning_up = 0;
 156
 157         if (already_cleaning_up) while(1) sleep(1);
 158         already_cleaning_up = 1;
 159
 160         /* Run any cleanup routines registered by loadable modules */
 161         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
 162                 (*fcn->h_function_pointer)();
 163         }
 164
 165         /* Close the AdjRefCount queue file */
 166         AdjRefCount(-1, 0);
 167
 168         for (m_fcn = MaintenanceThreadHookTable; m_fcn != NULL; m_fcn = m_fcn->next) {
 169                 lprintf(CTDL_INFO, "Waiting for maintenance thread \"%s\" to shut down\n", m_fcn->name);
 170                 pthread_join(m_fcn->MaintenanceThread_tid, NULL);
 171         }
 172
 173
 174         /* Close databases */
 175         lprintf(CTDL_INFO, "Closing databases\n");
 176         close_databases();
 177
 178         /* Do system-dependent stuff */
 179         sysdep_master_cleanup();
 180
 181 #ifdef DEBUG_MEMORY_LEAKS
 182         dump_heap();
 183 #endif
 184
 185         /* If the operator requested a halt but not an exit, halt here. */
 186         if (shutdown_and_halt) {
 187                 lprintf(CTDL_NOTICE, "citserver: Halting server without exiting.\n");
 188                 fflush(stdout); fflush(stderr);
 189                 while(1) {
 190                         sleep(32767);
 191                 }
 192         }
 193
 194         release_control();
 195
 196         /* Now go away. */
 197         lprintf(CTDL_NOTICE, "citserver: Exiting with status %d\n", exitcode);
 198         fflush(stdout); fflush(stderr);
 199
 200         if (restart_server != 0)
 201                 exit(1);
 202         exit(exitcode);
 203 }
 204
 205
 206
 207 /*
 208  * Terminate a session.
 209  */
 210 void RemoveContext (struct CitContext *con)
 211 {
 212         if (con==NULL) {
 213                 lprintf(CTDL_ERR,
 214                         "WARNING: RemoveContext() called with NULL!\n");
 215                 return;
 216         }
 217         lprintf(CTDL_DEBUG, "RemoveContext() session %d\n", con->cs_pid);
 218
 219         /* Run any cleanup routines registered by loadable modules.
 220          * Note: We have to "become_session()" because the cleanup functions
 221          *       might make references to "CC" assuming it's the right one.
 222          */
 223         become_session(con);
 224         PerformSessionHooks(EVT_STOP);
 225         become_session(NULL);
 226
 227         /* Now handle all of the administrivia. */
 228         lprintf(CTDL_DEBUG, "Calling logout(%d)\n", con->cs_pid);
 229         logout(con);
 230
 231         lprintf(CTDL_NOTICE, "[%3d] Session ended.\n", con->cs_pid);
 232
 233         /* If the client is still connected, blow 'em away. */
 234         lprintf(CTDL_DEBUG, "Closing socket %d\n", con->client_socket);
 235         close(con->client_socket);
 236
 237         lprintf(CTDL_DEBUG, "Done with RemoveContext()\n");
 238 }
 239
 240
 241
 242
 243
 244 /*
 245  * cmd_info()  -  tell the client about this server
 246  */
 247 void cmd_info(void) {
 248         cprintf("%d Server info:\n", LISTING_FOLLOWS);
 249         cprintf("%d\n", CC->cs_pid);
 250         cprintf("%s\n", config.c_nodename);
 251         cprintf("%s\n", config.c_humannode);
 252         cprintf("%s\n", config.c_fqdn);
 253         cprintf("%s\n", CITADEL);
 254         cprintf("%d\n", REV_LEVEL);
 255         cprintf("%s\n", config.c_site_location);
 256         cprintf("%s\n", config.c_sysadm);
 257         cprintf("%d\n", SERVER_TYPE);
 258         cprintf("%s\n", config.c_moreprompt);
 259         cprintf("1\n"); /* 1 = yes, this system supports floors */
 260         cprintf("1\n"); /* 1 = we support the extended paging options */
 261         cprintf("%s\n", CC->cs_nonce);
 262         cprintf("1\n"); /* 1 = yes, this system supports the QNOP command */
 263
 264 #ifdef HAVE_LDAP
 265         cprintf("1\n"); /* 1 = yes, this server is LDAP-enabled */
 266 #else
 267         cprintf("0\n"); /* 1 = no, this server is not LDAP-enabled */
 268 #endif
 269
 270         if (config.c_auth_mode == 1) {
 271                 cprintf("1\n"); /* "create new user" never works with host auth */
 272         }
 273         else {
 274                 cprintf("%d\n", config.c_disable_newu); /* otherwise, site defined */
 275         }
 276
 277         cprintf("%s\n", config.c_default_cal_zone);
 278
 279         cprintf("000\n");
 280 }
 281
 282
 283 /*
 284  * returns an asterisk if there are any instant messages waiting,
 285  * space otherwise.
 286  */
 287 char CtdlCheckExpress(void) {
 288         if (CC->FirstExpressMessage == NULL) {
 289                 return(' ');
 290         }
 291         else {
 292                 return('*');
 293         }
 294 }
 295
 296 void cmd_time(void)
 297 {
 298    time_t tv;
 299    struct tm tmp;
 300
 301    tv = time(NULL);
 302    localtime_r(&tv, &tmp);
 303
 304    /* timezone and daylight global variables are not portable. */
 305 #ifdef HAVE_STRUCT_TM_TM_GMTOFF
 306    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, tmp.tm_gmtoff, tmp.tm_isdst);
 307 #else
 308    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, timezone, tmp.tm_isdst);
 309 #endif
 310 }
 311
 312
 313 /*
 314  * Check originating host against the public_clients file.  This determines
 315  * whether the client is allowed to change the hostname for this session
 316  * (for example, to show the location of the user rather than the location
 317  * of the client).
 318  */
 319 int is_public_client(void)
 320 {
 321         char buf[1024];
 322         char addrbuf[1024];
 323         FILE *fp;
 324         int i;
 325         struct stat statbuf;
 326         static time_t pc_timestamp = 0;
 327         static char public_clients[SIZ];
 328         static char public_clients_file[SIZ];
 329
 330         snprintf(public_clients_file,
 331                          sizeof public_clients_file,
 332                          "%s/public_clients",
 333                          ctdl_etc_dir);
 334
 335         /*
 336          * Check the time stamp on the public_clients file.  If it's been
 337          * updated since the last time we were here (or if this is the first
 338          * time we've been through the loop), read its contents and learn
 339          * the IP addresses of the listed hosts.
 340          */
 341         if (stat(public_clients_file, &statbuf) != 0) {
 342                 /* No public_clients file exists, so bail out */
 343                 lprintf(CTDL_WARNING, "Warning: '%s' does not exist\n",
 344                                 public_clients_file);
 345                 return(0);
 346         }
 347
 348         if (statbuf.st_mtime > pc_timestamp) {
 349                 begin_critical_section(S_PUBLIC_CLIENTS);
 350                 lprintf(CTDL_INFO, "Loading %s\n", public_clients_file);
 351
 352                 safestrncpy(public_clients, "127.0.0.1", sizeof public_clients);
 353                 if (hostname_to_dotted_quad(addrbuf, config.c_fqdn) == 0) {
 354                         strcat(public_clients, "|");
 355                         strcat(public_clients, addrbuf);
 356                 }
 357
 358                 fp = fopen(public_clients_file, "r");
 359                 if (fp != NULL) while (fgets(buf, sizeof buf, fp)!=NULL) {
 360                         char *ptr;
 361                         ptr = buf;
 362                         while (!IsEmptyStr(ptr)) {
 363                                 if (*ptr == '#') {
 364                                         *ptr = 0;
 365                                         break;
 366                                 }
 367                                 else ptr++;
 368                         }
 369                         ptr--;
 370                         while (ptr>buf && isspace(*ptr)) {
 371                                 *(ptr--) = 0;
 372                         }
 373                         if (hostname_to_dotted_quad(addrbuf, buf) == 0) {
 374                                 if ((strlen(public_clients) +
 375                                    strlen(addrbuf) + 2)
 376                                    < sizeof(public_clients)) {
 377                                         strcat(public_clients, "|");
 378                                         strcat(public_clients, addrbuf);
 379                                 }
 380                         }
 381                 }
 382                 fclose(fp);
 383                 pc_timestamp = time(NULL);
 384                 end_critical_section(S_PUBLIC_CLIENTS);
 385         }
 386
 387         lprintf(CTDL_DEBUG, "Checking whether %s is a local or public client\n",
 388                 CC->cs_addr);
 389         for (i=0; i<num_parms(public_clients); ++i) {
 390                 extract_token(addrbuf, public_clients, i, '|', sizeof addrbuf);
 391                 if (!strcasecmp(CC->cs_addr, addrbuf)) {
 392                         lprintf(CTDL_DEBUG, "... yes it is.\n");
 393                         return(1);
 394                 }
 395         }
 396
 397         /* No hits.  This is not a public client. */
 398         lprintf(CTDL_DEBUG, "... no it isn't.\n");
 399         return(0);
 400 }
 401
 402
 403 /*
 404  * the client is identifying itself to the server
 405  */
 406 void cmd_iden(char *argbuf)
 407 {
 408         int dev_code;
 409         int cli_code;
 410         int rev_level;
 411         char desc[128];
 412         char from_host[128];
 413         struct in_addr addr;
 414         int do_lookup = 0;
 415
 416         if (num_parms(argbuf)<4) {
 417                 cprintf("%d usage error\n", ERROR + ILLEGAL_VALUE);
 418                 return;
 419         }
 420
 421         dev_code = extract_int(argbuf,0);
 422         cli_code = extract_int(argbuf,1);
 423         rev_level = extract_int(argbuf,2);
 424         extract_token(desc, argbuf, 3, '|', sizeof desc);
 425
 426         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 427         from_host[sizeof from_host - 1] = 0;
 428         if (num_parms(argbuf)>=5) extract_token(from_host, argbuf, 4, '|', sizeof from_host);
 429
 430         CC->cs_clientdev = dev_code;
 431         CC->cs_clienttyp = cli_code;
 432         CC->cs_clientver = rev_level;
 433         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 434         CC->cs_clientname[31] = 0;
 435
 436         if (!IsEmptyStr(from_host)) {
 437                 if (CC->is_local_socket) do_lookup = 1;
 438                 else if (is_public_client()) do_lookup = 1;
 439         }
 440
 441         if (do_lookup) {
 442                 lprintf(CTDL_DEBUG, "Looking up hostname '%s'\n", from_host);
 443                 if ((addr.s_addr = inet_addr(from_host)) != -1) {
 444                         locate_host(CC->cs_host, sizeof CC->cs_host,
 445                                 CC->cs_addr, sizeof CC->cs_addr,
 446                                 &addr);
 447                 }
 448                 else {
 449                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 450                         CC->cs_host[sizeof CC->cs_host - 1] = 0;
 451                 }
 452         }
 453
 454         lprintf(CTDL_NOTICE, "Client %d/%d/%01d.%02d (%s) from %s\n",
 455                 dev_code,
 456                 cli_code,
 457                 (rev_level / 100),
 458                 (rev_level % 100),
 459                 desc,
 460                 CC->cs_host);
 461         cprintf("%d Ok\n",CIT_OK);
 462 }
 463
 464
 465 /*
 466  * display system messages or help
 467  */
 468 void cmd_mesg(char *mname)
 469 {
 470         FILE *mfp;
 471         char targ[256];
 472         char buf[256];
 473         char buf2[256];
 474         char *dirs[2];
 475         DIR *dp;
 476         struct dirent *d;
 477
 478         extract_token(buf, mname, 0, '|', sizeof buf);
 479
 480         dirs[0] = strdup(ctdl_message_dir);
 481         dirs[1] = strdup(ctdl_hlp_dir);
 482
 483         snprintf(buf2, sizeof buf2, "%s.%d.%d",
 484                 buf, CC->cs_clientdev, CC->cs_clienttyp);
 485
 486         /* If the client requested "?" then produce a listing */
 487         if (!strcmp(buf, "?")) {
 488                 cprintf("%d %s\n", LISTING_FOLLOWS, buf);
 489                 dp = opendir(dirs[1]);
 490                 if (dp != NULL) {
 491                         while (d = readdir(dp), d != NULL) {
 492                                 if (d->d_name[0] != '.') {
 493                                         cprintf(" %s\n", d->d_name);
 494                                 }
 495                         }
 496                         closedir(dp);
 497                 }
 498                 cprintf("000\n");
 499                 free(dirs[0]);
 500                 free(dirs[1]);
 501                 return;
 502         }
 503
 504         /* Otherwise, look for the requested file by name. */
 505         else {
 506                 mesg_locate(targ, sizeof targ, buf2, 2, (const char **)dirs);
 507                 if (IsEmptyStr(targ)) {
 508                         snprintf(buf2, sizeof buf2, "%s.%d",
 509                                                         buf, CC->cs_clientdev);
 510                         mesg_locate(targ, sizeof targ, buf2, 2,
 511                                                         (const char **)dirs);
 512                         if (IsEmptyStr(targ)) {
 513                                 mesg_locate(targ, sizeof targ, buf, 2,
 514                                                         (const char **)dirs);
 515                         }
 516                 }
 517         }
 518
 519         free(dirs[0]);
 520         free(dirs[1]);
 521
 522         if (IsEmptyStr(targ)) {
 523                 cprintf("%d '%s' not found.  (Searching in %s and %s)\n",
 524                         ERROR + FILE_NOT_FOUND,
 525                         mname,
 526                         ctdl_message_dir,
 527                         ctdl_hlp_dir
 528                 );
 529                 return;
 530         }
 531
 532         mfp = fopen(targ, "r");
 533         if (mfp==NULL) {
 534                 cprintf("%d Cannot open '%s': %s\n",
 535                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
 536                 return;
 537         }
 538         cprintf("%d %s\n", LISTING_FOLLOWS,buf);
 539
 540         while (fgets(buf, (sizeof buf - 1), mfp) != NULL) {
 541                 buf[strlen(buf)-1] = 0;
 542                 do_help_subst(buf);
 543                 cprintf("%s\n",buf);
 544         }
 545
 546         fclose(mfp);
 547         cprintf("000\n");
 548 }
 549
 550
 551 /*
 552  * enter system messages or help
 553  */
 554 void cmd_emsg(char *mname)
 555 {
 556         FILE *mfp;
 557         char targ[256];
 558         char buf[256];
 559         char *dirs[2];
 560         int a;
 561
 562         unbuffer_output();
 563
 564         if (CtdlAccessCheck(ac_aide)) return;
 565
 566         extract_token(buf, mname, 0, '|', sizeof buf);
 567         for (a=0; !IsEmptyStr(&buf[a]); ++a) {          /* security measure */
 568                 if (buf[a] == '/') buf[a] = '.';
 569         }
 570
 571         dirs[0] = strdup(ctdl_message_dir);
 572         dirs[1] = strdup(ctdl_hlp_dir);
 573
 574         mesg_locate(targ, sizeof targ, buf, 2, (const char**)dirs);
 575         free(dirs[0]);
 576         free(dirs[1]);
 577
 578         if (IsEmptyStr(targ)) {
 579                 snprintf(targ, sizeof targ,
 580                                  "%s/%s",
 581                                  ctdl_hlp_dir, buf);
 582         }
 583
 584         mfp = fopen(targ,"w");
 585         if (mfp==NULL) {
 586                 cprintf("%d Cannot open '%s': %s\n",
 587                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
 588                 return;
 589         }
 590         cprintf("%d %s\n", SEND_LISTING, targ);
 591
 592         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 593                 fprintf(mfp, "%s\n", buf);
 594         }
 595
 596         fclose(mfp);
 597 }
 598
 599
 600 /* Don't show the names of private rooms unless the viewing
 601  * user also knows the rooms.
 602  */
 603 void GenerateRoomDisplay(char *real_room,
 604                         struct CitContext *viewed,
 605                         struct CitContext *viewer) {
 606
 607         int ra;
 608
 609         strcpy(real_room, viewed->room.QRname);
 610         if (viewed->room.QRflags & QR_MAILBOX) {
 611                 strcpy(real_room, &real_room[11]);
 612         }
 613         if (viewed->room.QRflags & QR_PRIVATE) {
 614                 CtdlRoomAccess(&viewed->room, &viewer->user, &ra, NULL);
 615                 if ( (ra & UA_KNOWN) == 0) {
 616                         strcpy(real_room, "<private room>");
 617                 }
 618         }
 619
 620         if (viewed->cs_flags & CS_CHAT) {
 621                 while (strlen(real_room) < 14)
 622                         strcat(real_room, " ");
 623
 624                 strcpy(&real_room[14], "<chat>");
 625         }
 626
 627 }
 628
 629 /*
 630  * Convenience function.
 631  */
 632 int CtdlAccessCheck(int required_level) {
 633
 634         if (CC->internal_pgm) return(0);
 635         if (required_level >= ac_internal) {
 636                 cprintf("%d This is not a user-level command.\n",
 637                         ERROR + HIGHER_ACCESS_REQUIRED);
 638                 return(-1);
 639         }
 640
 641         if ((required_level >= ac_logged_in) && (CC->logged_in == 0)) {
 642                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 643                 return(-1);
 644         }
 645
 646         if (CC->user.axlevel >= 6) return(0);
 647         if (required_level >= ac_aide) {
 648                 cprintf("%d This command requires Aide access.\n",
 649                         ERROR + HIGHER_ACCESS_REQUIRED);
 650                 return(-1);
 651         }
 652
 653         if (is_room_aide()) return(0);
 654         if (required_level >= ac_room_aide) {
 655                 cprintf("%d This command requires Aide or Room Aide access.\n",
 656                         ERROR + HIGHER_ACCESS_REQUIRED);
 657                 return(-1);
 658         }
 659
 660         /* shhh ... succeed quietly */
 661         return(0);
 662 }
 663
 664
 665
 666 /*
 667  * Terminate another running session
 668  */
 669 void cmd_term(char *cmdbuf)
 670 {
 671         int session_num;
 672         struct CitContext *ccptr;
 673         int found_it = 0;
 674         int allowed = 0;
 675
 676         session_num = extract_int(cmdbuf, 0);
 677         if (session_num == CC->cs_pid) {
 678                 cprintf("%d You can't kill your own session.\n", ERROR + ILLEGAL_VALUE);
 679                 return;
 680         }
 681
 682         lprintf(CTDL_DEBUG, "Locating session to kill\n");
 683         begin_critical_section(S_SESSION_TABLE);
 684         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 685                 if (session_num == ccptr->cs_pid) {
 686                         found_it = 1;
 687                         if ((ccptr->user.usernum == CC->user.usernum)
 688                            || (CC->user.axlevel >= 6)) {
 689                                 allowed = 1;
 690                                 ccptr->kill_me = 1;
 691                         }
 692                         else {
 693                                 allowed = 0;
 694                         }
 695                 }
 696         }
 697         end_critical_section(S_SESSION_TABLE);
 698
 699         if (found_it) {
 700                 if (allowed) {
 701                         cprintf("%d Session terminated.\n", CIT_OK);
 702                 }
 703                 else {
 704                         cprintf("%d You are not allowed to do that.\n",
 705                                 ERROR + HIGHER_ACCESS_REQUIRED);
 706                 }
 707         }
 708         else {
 709                 cprintf("%d No such session.\n", ERROR + ILLEGAL_VALUE);
 710         }
 711 }
 712
 713
 714
 715
 716
 717 /*
 718  * get the paginator prompt
 719  */
 720 void cmd_more(void) {
 721         cprintf("%d %s\n", CIT_OK, config.c_moreprompt);
 722 }
 723
 724 /*
 725  * echo
 726  */
 727 void cmd_echo(char *etext)
 728 {
 729         cprintf("%d %s\n", CIT_OK, etext);
 730 }
 731
 732
 733
 734 /*
 735  * identify as internal program
 736  */
 737 void cmd_ipgm(char *argbuf)
 738 {
 739         int secret;
 740
 741         secret = extract_int(argbuf, 0);
 742
 743         /* For security reasons, we do NOT allow this command to run
 744          * over the network.  Local sockets only.
 745          */
 746         if (!CC->is_local_socket) {
 747                 sleep(5);
 748                 cprintf("%d Authentication failed.\n",
 749                         ERROR + PASSWORD_REQUIRED);
 750         }
 751         else if (secret == config.c_ipgm_secret) {
 752                 CC->internal_pgm = 1;
 753                 strcpy(CC->curr_user, "<internal program>");
 754                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 755                 cprintf("%d Authenticated as an internal program.\n", CIT_OK);
 756         }
 757         else {
 758                 sleep(5);
 759                 cprintf("%d Authentication failed.\n",
 760                         ERROR + PASSWORD_REQUIRED);
 761                 lprintf(CTDL_ERR, "Warning: ipgm authentication failed.\n");
 762                 CC->kill_me = 1;
 763         }
 764
 765         /* Now change the ipgm secret for the next round.
 766          * (Disabled because it breaks concurrent scripts.  The fact that
 767          * we no longer accept IPGM over the network should be sufficient
 768          * to prevent brute-force attacks.  If you don't agree, uncomment
 769          * this block.)
 770         get_config();
 771         config.c_ipgm_secret = rand();
 772         put_config();
 773         */
 774 }
 775
 776
 777 /*
 778  * Shut down the server
 779  */
 780 void cmd_down(char *argbuf) {
 781         char *Reply ="%d Shutting down server.  Goodbye.\n";
 782
 783         if (CtdlAccessCheck(ac_aide)) return;
 784
 785         if (!IsEmptyStr(argbuf))
 786         {
 787                 int state = CIT_OK;
 788                 restart_server = extract_int(argbuf, 0);
 789
 790                 if (restart_server > 0)
 791                         Reply = "%d Restarting server.  See you soon.\n";
 792                 if ((restart_server > 0) && !running_as_daemon)
 793                 {
 794                         lprintf(CTDL_ERR, "The user requested restart, but not running as deamon! Geronimooooooo!\n");
 795                         Reply = "%d Warning, not running in deamon mode. maybe we will come up again, but don't lean on it.\n";
 796                         state = ERROR;
 797                 }
 798                 cprintf(Reply, state);
 799         }
 800         else
 801         {
 802                 cprintf(Reply, CIT_OK);
 803         }
 804         time_to_die = 1;
 805 }
 806
 807 /*
 808  * Halt the server without exiting the server process.
 809  */
 810 void cmd_halt(void) {
 811
 812         if (CtdlAccessCheck(ac_aide)) return;
 813
 814         cprintf("%d Halting server.  Goodbye.\n", CIT_OK);
 815         time_to_die = 1;
 816         shutdown_and_halt = 1;
 817 }
 818
 819 /*
 820  * Schedule or cancel a server shutdown
 821  */
 822 void cmd_scdn(char *argbuf)
 823 {
 824         int new_state;
 825         int state = CIT_OK;
 826         char *Reply = "%d %d\n";
 827
 828         if (CtdlAccessCheck(ac_aide)) return;
 829
 830         new_state = extract_int(argbuf, 0);
 831         if ((new_state == 2) || (new_state == 3))
 832         {
 833                 restart_server = 1;
 834                 if (!running_as_daemon)
 835                 {
 836                         lprintf(CTDL_ERR, "The user requested restart, but not running as deamon! Geronimooooooo!\n");
 837                         Reply = "%d %d Warning, not running in deamon mode. maybe we will come up again, but don't lean on it.\n";
 838                         state = ERROR;
 839                 }
 840
 841                 restart_server = extract_int(argbuf, 0);
 842                 new_state -= 2;
 843         }
 844         if ((new_state == 0) || (new_state == 1)) {
 845                 ScheduledShutdown = new_state;
 846         }
 847         cprintf(Reply, state, ScheduledShutdown);
 848 }
 849
 850
 851 /*
 852  * Set or unset asynchronous protocol mode
 853  */
 854 void cmd_asyn(char *argbuf)
 855 {
 856         int new_state;
 857
 858         new_state = extract_int(argbuf, 0);
 859         if ((new_state == 0) || (new_state == 1)) {
 860                 CC->is_async = new_state;
 861         }
 862         cprintf("%d %d\n", CIT_OK, CC->is_async);
 863 }
 864
 865
 866 /*
 867  * Generate a "nonce" for APOP-style authentication.
 868  *
 869  * RFC 1725 et al specify a PID to be placed in front of the nonce.
 870  * Quoth BTX: That would be stupid.
 871  */
 872 void generate_nonce(struct CitContext *con) {
 873         struct timeval tv;
 874
 875         memset(con->cs_nonce, NONCE_SIZE, 0);
 876         gettimeofday(&tv, NULL);
 877         memset(con->cs_nonce, NONCE_SIZE, 0);
 878         snprintf(con->cs_nonce, NONCE_SIZE, "<%d%ld@%s>",
 879                 rand(), (long)tv.tv_usec, config.c_fqdn);
 880 }
 881
 882
 883
 884
 885 /*
 886  * Back-end function for starting a session
 887  */
 888 void begin_session(struct CitContext *con)
 889 {
 890         socklen_t len;
 891         struct sockaddr_in sin;
 892
 893         /*
 894          * Initialize some variables specific to our context.
 895          */
 896         con->logged_in = 0;
 897         con->internal_pgm = 0;
 898         con->download_fp = NULL;
 899         con->upload_fp = NULL;
 900         con->FirstExpressMessage = NULL;
 901         time(&con->lastcmd);
 902         time(&con->lastidle);
 903         strcpy(con->lastcmdname, "    ");
 904         strcpy(con->cs_clientname, "(unknown)");
 905         strcpy(con->curr_user, NLI);
 906         strcpy(con->net_node, "");
 907         strcpy(con->fake_username, "");
 908         strcpy(con->fake_hostname, "");
 909         strcpy(con->fake_roomname, "");
 910         generate_nonce(con);
 911         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 912         safestrncpy(con->cs_addr, "", sizeof con->cs_addr);
 913         con->cs_host[sizeof con->cs_host - 1] = 0;
 914         len = sizeof sin;
 915         if (!CC->is_local_socket) {
 916                 if (!getpeername(con->client_socket, (struct sockaddr *) &sin, &len)) {
 917                         locate_host(con->cs_host, sizeof con->cs_host,
 918                                 con->cs_addr, sizeof con->cs_addr,
 919                                 &sin.sin_addr
 920                         );
 921                 }
 922         }
 923         else {
 924                 strcpy(con->cs_host, "");
 925         }
 926         con->cs_flags = 0;
 927         con->upload_type = UPL_FILE;
 928         con->dl_is_net = 0;
 929
 930         con->nologin = 0;
 931         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions)) {
 932                 con->nologin = 1;
 933         }
 934
 935         lprintf(CTDL_NOTICE, "Session started.\n");
 936
 937         /* Run any session startup routines registered by loadable modules */
 938         PerformSessionHooks(EVT_START);
 939 }
 940
 941
 942 void citproto_begin_session() {
 943         if (CC->nologin==1) {
 944                 cprintf("%d %s: Too many users are already online (maximum is %d)\n",
 945                         ERROR + MAX_SESSIONS_EXCEEDED,
 946                         config.c_nodename, config.c_maxsessions
 947                 );
 948                 CC->kill_me = 1;
 949         }
 950         else {
 951                 cprintf("%d %s Citadel server ready.\n",
 952                         CIT_OK, config.c_nodename);
 953         }
 954 }
 955
 956
 957
 958
 959 /*
 960  * This loop recognizes all server commands.
 961  */
 962 void do_command_loop(void) {
 963         char cmdbuf[SIZ];
 964
 965         time(&CC->lastcmd);
 966         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 967         if (client_getln(cmdbuf, sizeof cmdbuf) < 1) {
 968                 lprintf(CTDL_ERR, "Client disconnected: ending session.\n");
 969                 CC->kill_me = 1;
 970                 return;
 971         }
 972
 973         /* Log the server command, but don't show passwords... */
 974         if ( (strncasecmp(cmdbuf, "PASS", 4))
 975            && (strncasecmp(cmdbuf, "SETP", 4)) ) {
 976                 lprintf(CTDL_INFO, "%s\n", cmdbuf);
 977         }
 978         else {
 979                 lprintf(CTDL_INFO, "<password command sent>\n");
 980         }
 981
 982         buffer_output();
 983
 984         /*
 985          * Let other clients see the last command we executed, and
 986          * update the idle time, but not NOOP, QNOP, PEXP, GEXP, RWHO, or TIME.
 987          */
 988         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 989            && (strncasecmp(cmdbuf, "QNOP", 4))
 990            && (strncasecmp(cmdbuf, "PEXP", 4))
 991            && (strncasecmp(cmdbuf, "GEXP", 4))
 992            && (strncasecmp(cmdbuf, "RWHO", 4))
 993            && (strncasecmp(cmdbuf, "TIME", 4)) ) {
 994                 strcpy(CC->lastcmdname, "    ");
 995                 safestrncpy(CC->lastcmdname, cmdbuf, sizeof(CC->lastcmdname));
 996                 time(&CC->lastidle);
 997         }
 998
 999         if ((strncasecmp(cmdbuf, "ENT0", 4))
1000            && (strncasecmp(cmdbuf, "MESG", 4))
1001            && (strncasecmp(cmdbuf, "MSGS", 4)))
1002         {
1003            CC->cs_flags &= ~CS_POSTING;
1004         }
1005
1006         if (!strncasecmp(cmdbuf, "NOOP", 4)) {
1007                 cprintf("%d%cok\n", CIT_OK, CtdlCheckExpress() );
1008         }
1009
1010         else if (!strncasecmp(cmdbuf, "QNOP", 4)) {
1011                 /* do nothing, this command returns no response */
1012         }
1013
1014         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
1015                 cprintf("%d Goodbye.\n", CIT_OK);
1016                 CC->kill_me = 1;
1017         }
1018
1019         else if (!strncasecmp(cmdbuf,"ASYN",4)) {
1020                 cmd_asyn(&cmdbuf[5]);
1021         }
1022
1023         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
1024                 if (CC->logged_in) logout(CC);
1025                 cprintf("%d logged out.\n", CIT_OK);
1026         }
1027
1028         else if (!strncasecmp(cmdbuf,"USER",4)) {
1029                 cmd_user(&cmdbuf[5]);
1030         }
1031
1032         else if (!strncasecmp(cmdbuf,"PASS",4)) {
1033                 cmd_pass(&cmdbuf[5]);
1034         }
1035
1036         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
1037                 cmd_newu(&cmdbuf[5]);
1038         }
1039
1040         else if (!strncasecmp(cmdbuf,"CREU",4)) {
1041                 cmd_creu(&cmdbuf[5]);
1042         }
1043
1044         else if (!strncasecmp(cmdbuf,"SETP",4)) {
1045                 cmd_setp(&cmdbuf[5]);
1046         }
1047
1048         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
1049                 cmd_lrms(&cmdbuf[5]);
1050         }
1051
1052         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
1053                 cmd_lkra(&cmdbuf[5]);
1054         }
1055
1056         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
1057                 cmd_lkrn(&cmdbuf[5]);
1058         }
1059
1060         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
1061                 cmd_lkro(&cmdbuf[5]);
1062         }
1063
1064         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
1065                 cmd_lzrm(&cmdbuf[5]);
1066         }
1067
1068         else if (!strncasecmp(cmdbuf,"LPRM",4)) {
1069                 cmd_lprm(&cmdbuf[5]);
1070         }
1071
1072         else if (!strncasecmp(cmdbuf,"GETU",4)) {
1073                 cmd_getu();
1074         }
1075
1076         else if (!strncasecmp(cmdbuf,"SETU",4)) {
1077                 cmd_setu(&cmdbuf[5]);
1078         }
1079
1080         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
1081                 cmd_goto(&cmdbuf[5]);
1082         }
1083
1084         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
1085                 cmd_msgs(&cmdbuf[5]);
1086         }
1087
1088         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
1089                 cmd_whok();
1090         }
1091
1092         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
1093                 cmd_rdir();
1094         }
1095
1096         else if (!strncasecmp(cmdbuf,"EUID",4)) {
1097                 cmd_euid(&cmdbuf[5]);
1098         }
1099
1100         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
1101                 cmd_msg0(&cmdbuf[5]);
1102         }
1103
1104         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
1105                 cmd_msg2(&cmdbuf[5]);
1106         }
1107
1108         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
1109                 cmd_msg3(&cmdbuf[5]);
1110         }
1111
1112         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
1113                 cmd_msg4(&cmdbuf[5]);
1114         }
1115
1116         else if (!strncasecmp(cmdbuf,"MSGP",4)) {
1117                 cmd_msgp(&cmdbuf[5]);
1118         }
1119
1120         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
1121                 cmd_opna(&cmdbuf[5]);
1122         }
1123
1124         else if (!strncasecmp(cmdbuf,"DLAT",4)) {
1125                 cmd_dlat(&cmdbuf[5]);
1126         }
1127
1128         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1129                 cmd_info();
1130         }
1131
1132         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1133                 cmd_slrp(&cmdbuf[5]);
1134         }
1135
1136         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1137                 cmd_invt_kick(&cmdbuf[5],1);
1138         }
1139
1140         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1141                 cmd_invt_kick(&cmdbuf[5],0);
1142         }
1143
1144         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1145                 cmd_getr();
1146         }
1147
1148         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1149                 cmd_setr(&cmdbuf[5]);
1150         }
1151
1152         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1153                 cmd_geta();
1154         }
1155
1156         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1157                 cmd_seta(&cmdbuf[5]);
1158         }
1159
1160         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1161                 cmd_ent0(&cmdbuf[5]);
1162         }
1163
1164         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1165                 cmd_rinf();
1166         }
1167
1168         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1169                 cmd_dele(&cmdbuf[5]);
1170         }
1171
1172         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1173                 cmd_kill(&cmdbuf[5]);
1174         }
1175
1176         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1177                 cmd_cre8(&cmdbuf[5]);
1178         }
1179
1180         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1181                 cmd_move(&cmdbuf[5]);
1182         }
1183
1184         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1185                 cmd_forg();
1186         }
1187
1188         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1189                 cmd_mesg(&cmdbuf[5]);
1190         }
1191
1192         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1193                 cmd_emsg(&cmdbuf[5]);
1194         }
1195
1196         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1197                 cmd_gnur();
1198         }
1199
1200         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1201                 cmd_vali(&cmdbuf[5]);
1202         }
1203
1204         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1205                 cmd_einf(&cmdbuf[5]);
1206         }
1207
1208         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1209                 cmd_list(&cmdbuf[5]);
1210         }
1211
1212         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1213                 cmd_chek();
1214         }
1215
1216         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1217                 cmd_delf(&cmdbuf[5]);
1218         }
1219
1220         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1221                 cmd_movf(&cmdbuf[5]);
1222         }
1223
1224         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1225                 cmd_netf(&cmdbuf[5]);
1226         }
1227
1228         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1229                 cmd_open(&cmdbuf[5]);
1230         }
1231
1232         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1233                 cmd_clos();
1234         }
1235
1236         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1237                 cmd_uopn(&cmdbuf[5]);
1238         }
1239
1240         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1241                 cmd_ucls(&cmdbuf[5]);
1242         }
1243
1244         else if (!strncasecmp(cmdbuf,"READ",4)) {
1245                 cmd_read(&cmdbuf[5]);
1246         }
1247
1248         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1249                 cmd_writ(&cmdbuf[5]);
1250         }
1251
1252         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1253                 cmd_qusr(&cmdbuf[5]);
1254         }
1255
1256         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1257                 cmd_echo(&cmdbuf[5]);
1258         }
1259
1260         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1261                 cmd_oimg(&cmdbuf[5]);
1262         }
1263
1264         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1265                 cmd_more();
1266         }
1267
1268         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1269                 cmd_ndop(&cmdbuf[5]);
1270         }
1271
1272         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1273                 cmd_nuop(&cmdbuf[5]);
1274         }
1275
1276         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1277                 cmd_lflr();
1278         }
1279
1280         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1281                 cmd_cflr(&cmdbuf[5]);
1282         }
1283
1284         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1285                 cmd_kflr(&cmdbuf[5]);
1286         }
1287
1288         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1289                 cmd_eflr(&cmdbuf[5]);
1290         }
1291
1292         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1293                 cmd_iden(&cmdbuf[5]);
1294         }
1295
1296         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1297                 cmd_ipgm(&cmdbuf[5]);
1298         }
1299
1300         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1301                 cmd_term(&cmdbuf[5]);
1302         }
1303
1304         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1305                 cmd_down(&cmdbuf[5]);
1306         }
1307
1308         else if (!strncasecmp(cmdbuf,"HALT",4)) {
1309                 cmd_halt();
1310         }
1311
1312         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1313                 cmd_scdn(&cmdbuf[5]);
1314         }
1315
1316         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1317                 cmd_uimg(&cmdbuf[5]);
1318         }
1319
1320         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1321                 cmd_time();
1322         }
1323
1324         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1325                 cmd_agup(&cmdbuf[5]);
1326         }
1327
1328         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1329                 cmd_asup(&cmdbuf[5]);
1330         }
1331
1332         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1333                 cmd_gpex(&cmdbuf[5]);
1334         }
1335
1336         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1337                 cmd_spex(&cmdbuf[5]);
1338         }
1339
1340         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1341                 cmd_conf(&cmdbuf[5]);
1342         }
1343
1344         else if (!strncasecmp(cmdbuf, "SEEN", 4)) {
1345                 cmd_seen(&cmdbuf[5]);
1346         }
1347
1348         else if (!strncasecmp(cmdbuf, "GTSN", 4)) {
1349                 cmd_gtsn(&cmdbuf[5]);
1350         }
1351
1352         else if (!strncasecmp(cmdbuf, "VIEW", 4)) {
1353                 cmd_view(&cmdbuf[5]);
1354         }
1355
1356         else if (!strncasecmp(cmdbuf, "ISME", 4)) {
1357                 cmd_isme(&cmdbuf[5]);
1358         }
1359
1360         else if (!DLoader_Exec_Cmd(cmdbuf)) {
1361                 cprintf("%d Unrecognized or unsupported command.\n",
1362                         ERROR + CMD_NOT_SUPPORTED);
1363                }
1364
1365         unbuffer_output();
1366
1367         /* Run any after-each-command routines registered by modules */
1368         PerformSessionHooks(EVT_CMD);
1369 }
1370
1371
1372 /*
1373  * This loop performs all asynchronous functions.
1374  */
1375 void do_async_loop(void) {
1376         PerformSessionHooks(EVT_ASYNC);
1377 }