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