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         /* flush the networker stuff */
 179 /*      destroy_network_queue_room();*/
 180
 181         /* Do system-dependent stuff */
 182         sysdep_master_cleanup();
 183
 184 #ifdef DEBUG_MEMORY_LEAKS
 185         dump_heap();
 186 #endif
 187
 188         /* If the operator requested a halt but not an exit, halt here. */
 189         if (shutdown_and_halt) {
 190                 lprintf(CTDL_NOTICE, "citserver: Halting server without exiting.\n");
 191                 fflush(stdout); fflush(stderr);
 192                 while(1) {
 193                         sleep(32767);
 194                 }
 195         }
 196
 197         release_control();
 198
 199         /* Now go away. */
 200         lprintf(CTDL_NOTICE, "citserver: Exiting with status %d\n", exitcode);
 201         fflush(stdout); fflush(stderr);
 202
 203         if (restart_server != 0)
 204                 exit(1);
 205         exit(exitcode);
 206 }
 207
 208
 209
 210 /*
 211  * Terminate a session.
 212  */
 213 void RemoveContext (struct CitContext *con)
 214 {
 215         if (con==NULL) {
 216                 lprintf(CTDL_ERR,
 217                         "WARNING: RemoveContext() called with NULL!\n");
 218                 return;
 219         }
 220         lprintf(CTDL_DEBUG, "RemoveContext() session %d\n", con->cs_pid);
 221
 222         /* Run any cleanup routines registered by loadable modules.
 223          * Note: We have to "become_session()" because the cleanup functions
 224          *       might make references to "CC" assuming it's the right one.
 225          */
 226         become_session(con);
 227         PerformSessionHooks(EVT_STOP);
 228         become_session(NULL);
 229
 230         /* Now handle all of the administrivia. */
 231         lprintf(CTDL_DEBUG, "Calling logout(%d)\n", con->cs_pid);
 232         logout(con);
 233
 234         lprintf(CTDL_NOTICE, "[%3d] Session ended.\n", con->cs_pid);
 235
 236         /* If the client is still connected, blow 'em away. */
 237         lprintf(CTDL_DEBUG, "Closing socket %d\n", con->client_socket);
 238         close(con->client_socket);
 239
 240         lprintf(CTDL_DEBUG, "Done with RemoveContext()\n");
 241 }
 242
 243
 244
 245
 246
 247 /*
 248  * cmd_info()  -  tell the client about this server
 249  */
 250 void cmd_info(void) {
 251         cprintf("%d Server info:\n", LISTING_FOLLOWS);
 252         cprintf("%d\n", CC->cs_pid);
 253         cprintf("%s\n", config.c_nodename);
 254         cprintf("%s\n", config.c_humannode);
 255         cprintf("%s\n", config.c_fqdn);
 256         cprintf("%s\n", CITADEL);
 257         cprintf("%d\n", REV_LEVEL);
 258         cprintf("%s\n", config.c_site_location);
 259         cprintf("%s\n", config.c_sysadm);
 260         cprintf("%d\n", SERVER_TYPE);
 261         cprintf("%s\n", config.c_moreprompt);
 262         cprintf("1\n"); /* 1 = yes, this system supports floors */
 263         cprintf("1\n"); /* 1 = we support the extended paging options */
 264         cprintf("%s\n", CC->cs_nonce);
 265         cprintf("1\n"); /* 1 = yes, this system supports the QNOP command */
 266
 267 #ifdef HAVE_LDAP
 268         cprintf("1\n"); /* 1 = yes, this server is LDAP-enabled */
 269 #else
 270         cprintf("0\n"); /* 1 = no, this server is not LDAP-enabled */
 271 #endif
 272
 273         if (config.c_auth_mode == 1) {
 274                 cprintf("1\n"); /* "create new user" never works with host auth */
 275         }
 276         else {
 277                 cprintf("%d\n", config.c_disable_newu); /* otherwise, site defined */
 278         }
 279
 280         cprintf("%s\n", config.c_default_cal_zone);
 281
 282         cprintf("000\n");
 283 }
 284
 285
 286 /*
 287  * returns an asterisk if there are any instant messages waiting,
 288  * space otherwise.
 289  */
 290 char CtdlCheckExpress(void) {
 291         if (CC->FirstExpressMessage == NULL) {
 292                 return(' ');
 293         }
 294         else {
 295                 return('*');
 296         }
 297 }
 298
 299 void cmd_time(void)
 300 {
 301    time_t tv;
 302    struct tm tmp;
 303
 304    tv = time(NULL);
 305    localtime_r(&tv, &tmp);
 306
 307    /* timezone and daylight global variables are not portable. */
 308 #ifdef HAVE_STRUCT_TM_TM_GMTOFF
 309    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, tmp.tm_gmtoff, tmp.tm_isdst);
 310 #else
 311    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, timezone, tmp.tm_isdst);
 312 #endif
 313 }
 314
 315
 316 /*
 317  * Check originating host against the public_clients file.  This determines
 318  * whether the client is allowed to change the hostname for this session
 319  * (for example, to show the location of the user rather than the location
 320  * of the client).
 321  */
 322 int is_public_client(void)
 323 {
 324         char buf[1024];
 325         char addrbuf[1024];
 326         FILE *fp;
 327         int i;
 328         struct stat statbuf;
 329         static time_t pc_timestamp = 0;
 330         static char public_clients[SIZ];
 331         static char public_clients_file[SIZ];
 332
 333         snprintf(public_clients_file,
 334                          sizeof public_clients_file,
 335                          "%s/public_clients",
 336                          ctdl_etc_dir);
 337
 338         /*
 339          * Check the time stamp on the public_clients file.  If it's been
 340          * updated since the last time we were here (or if this is the first
 341          * time we've been through the loop), read its contents and learn
 342          * the IP addresses of the listed hosts.
 343          */
 344         if (stat(public_clients_file, &statbuf) != 0) {
 345                 /* No public_clients file exists, so bail out */
 346                 lprintf(CTDL_WARNING, "Warning: '%s' does not exist\n",
 347                                 public_clients_file);
 348                 return(0);
 349         }
 350
 351         if (statbuf.st_mtime > pc_timestamp) {
 352                 begin_critical_section(S_PUBLIC_CLIENTS);
 353                 lprintf(CTDL_INFO, "Loading %s\n", public_clients_file);
 354
 355                 safestrncpy(public_clients, "127.0.0.1", sizeof public_clients);
 356                 if (hostname_to_dotted_quad(addrbuf, config.c_fqdn) == 0) {
 357                         strcat(public_clients, "|");
 358                         strcat(public_clients, addrbuf);
 359                 }
 360
 361                 fp = fopen(public_clients_file, "r");
 362                 if (fp != NULL) while (fgets(buf, sizeof buf, fp)!=NULL) {
 363                         char *ptr;
 364                         ptr = buf;
 365                         while (!IsEmptyStr(ptr)) {
 366                                 if (*ptr == '#') {
 367                                         *ptr = 0;
 368                                         break;
 369                                 }
 370                                 else ptr++;
 371                         }
 372                         while (isspace((buf[strlen(buf)-1]))) {
 373                                 buf[strlen(buf)-1] = 0;
 374                         }
 375                         if (hostname_to_dotted_quad(addrbuf, buf) == 0) {
 376                                 if ((strlen(public_clients) +
 377                                    strlen(addrbuf) + 2)
 378                                    < sizeof(public_clients)) {
 379                                         strcat(public_clients, "|");
 380                                         strcat(public_clients, addrbuf);
 381                                 }
 382                         }
 383                 }
 384                 fclose(fp);
 385                 pc_timestamp = time(NULL);
 386                 end_critical_section(S_PUBLIC_CLIENTS);
 387         }
 388
 389         lprintf(CTDL_DEBUG, "Checking whether %s is a local or public client\n",
 390                 CC->cs_addr);
 391         for (i=0; i<num_parms(public_clients); ++i) {
 392                 extract_token(addrbuf, public_clients, i, '|', sizeof addrbuf);
 393                 if (!strcasecmp(CC->cs_addr, addrbuf)) {
 394                         lprintf(CTDL_DEBUG, "... yes it is.\n");
 395                         return(1);
 396                 }
 397         }
 398
 399         /* No hits.  This is not a public client. */
 400         lprintf(CTDL_DEBUG, "... no it isn't.\n");
 401         return(0);
 402 }
 403
 404
 405 /*
 406  * the client is identifying itself to the server
 407  */
 408 void cmd_iden(char *argbuf)
 409 {
 410         int dev_code;
 411         int cli_code;
 412         int rev_level;
 413         char desc[128];
 414         char from_host[128];
 415         struct in_addr addr;
 416         int do_lookup = 0;
 417
 418         if (num_parms(argbuf)<4) {
 419                 cprintf("%d usage error\n", ERROR + ILLEGAL_VALUE);
 420                 return;
 421         }
 422
 423         dev_code = extract_int(argbuf,0);
 424         cli_code = extract_int(argbuf,1);
 425         rev_level = extract_int(argbuf,2);
 426         extract_token(desc, argbuf, 3, '|', sizeof desc);
 427
 428         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 429         from_host[sizeof from_host - 1] = 0;
 430         if (num_parms(argbuf)>=5) extract_token(from_host, argbuf, 4, '|', sizeof from_host);
 431
 432         CC->cs_clientdev = dev_code;
 433         CC->cs_clienttyp = cli_code;
 434         CC->cs_clientver = rev_level;
 435         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 436         CC->cs_clientname[31] = 0;
 437
 438         if (!IsEmptyStr(from_host)) {
 439                 if (CC->is_local_socket) do_lookup = 1;
 440                 else if (is_public_client()) do_lookup = 1;
 441         }
 442
 443         if (do_lookup) {
 444                 lprintf(CTDL_DEBUG, "Looking up hostname '%s'\n", from_host);
 445                 if ((addr.s_addr = inet_addr(from_host)) != -1) {
 446                         locate_host(CC->cs_host, sizeof CC->cs_host,
 447                                 CC->cs_addr, sizeof CC->cs_addr,
 448                                 &addr);
 449                 }
 450                 else {
 451                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 452                         CC->cs_host[sizeof CC->cs_host - 1] = 0;
 453                 }
 454         }
 455
 456         lprintf(CTDL_NOTICE, "Client %d/%d/%01d.%02d (%s) from %s\n",
 457                 dev_code,
 458                 cli_code,
 459                 (rev_level / 100),
 460                 (rev_level % 100),
 461                 desc,
 462                 CC->cs_host);
 463         cprintf("%d Ok\n",CIT_OK);
 464 }
 465
 466
 467 /*
 468  * display system messages or help
 469  */
 470 void cmd_mesg(char *mname)
 471 {
 472         FILE *mfp;
 473         char targ[256];
 474         char buf[256];
 475         char buf2[256];
 476         char *dirs[2];
 477         DIR *dp;
 478         struct dirent *d;
 479
 480         extract_token(buf, mname, 0, '|', sizeof buf);
 481
 482         dirs[0] = strdup(ctdl_message_dir);
 483         dirs[1] = strdup(ctdl_hlp_dir);
 484
 485         snprintf(buf2, sizeof buf2, "%s.%d.%d",
 486                 buf, CC->cs_clientdev, CC->cs_clienttyp);
 487
 488         /* If the client requested "?" then produce a listing */
 489         if (!strcmp(buf, "?")) {
 490                 cprintf("%d %s\n", LISTING_FOLLOWS, buf);
 491                 dp = opendir(dirs[1]);
 492                 if (dp != NULL) {
 493                         while (d = readdir(dp), d != NULL) {
 494                                 if (d->d_name[0] != '.') {
 495                                         cprintf(" %s\n", d->d_name);
 496                                 }
 497                         }
 498                         closedir(dp);
 499                 }
 500                 cprintf("000\n");
 501                 free(dirs[0]);
 502                 free(dirs[1]);
 503                 return;
 504         }
 505
 506         /* Otherwise, look for the requested file by name. */
 507         else {
 508                 mesg_locate(targ, sizeof targ, buf2, 2, (const char **)dirs);
 509                 if (IsEmptyStr(targ)) {
 510                         snprintf(buf2, sizeof buf2, "%s.%d",
 511                                                         buf, CC->cs_clientdev);
 512                         mesg_locate(targ, sizeof targ, buf2, 2,
 513                                                         (const char **)dirs);
 514                         if (IsEmptyStr(targ)) {
 515                                 mesg_locate(targ, sizeof targ, buf, 2,
 516                                                         (const char **)dirs);
 517                         }
 518                 }
 519         }
 520
 521         free(dirs[0]);
 522         free(dirs[1]);
 523
 524         if (IsEmptyStr(targ)) {
 525                 cprintf("%d '%s' not found.  (Searching in %s and %s)\n",
 526                         ERROR + FILE_NOT_FOUND,
 527                         mname,
 528                         ctdl_message_dir,
 529                         ctdl_hlp_dir
 530                 );
 531                 return;
 532         }
 533
 534         mfp = fopen(targ, "r");
 535         if (mfp==NULL) {
 536                 cprintf("%d Cannot open '%s': %s\n",
 537                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
 538                 return;
 539         }
 540         cprintf("%d %s\n", LISTING_FOLLOWS,buf);
 541
 542         while (fgets(buf, (sizeof buf - 1), mfp) != NULL) {
 543                 buf[strlen(buf)-1] = 0;
 544                 do_help_subst(buf);
 545                 cprintf("%s\n",buf);
 546         }
 547
 548         fclose(mfp);
 549         cprintf("000\n");
 550 }
 551
 552
 553 /*
 554  * enter system messages or help
 555  */
 556 void cmd_emsg(char *mname)
 557 {
 558         FILE *mfp;
 559         char targ[256];
 560         char buf[256];
 561         char *dirs[2];
 562         int a;
 563
 564         unbuffer_output();
 565
 566         if (CtdlAccessCheck(ac_aide)) return;
 567
 568         extract_token(buf, mname, 0, '|', sizeof buf);
 569         for (a=0; !IsEmptyStr(&buf[a]); ++a) {          /* security measure */
 570                 if (buf[a] == '/') buf[a] = '.';
 571         }
 572
 573         dirs[0] = strdup(ctdl_message_dir);
 574         dirs[1] = strdup(ctdl_hlp_dir);
 575
 576         mesg_locate(targ, sizeof targ, buf, 2, (const char**)dirs);
 577         free(dirs[0]);
 578         free(dirs[1]);
 579
 580         if (IsEmptyStr(targ)) {
 581                 snprintf(targ, sizeof targ,
 582                                  "%s/%s",
 583                                  ctdl_hlp_dir, buf);
 584         }
 585
 586         mfp = fopen(targ,"w");
 587         if (mfp==NULL) {
 588                 cprintf("%d Cannot open '%s': %s\n",
 589                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
 590                 return;
 591         }
 592         cprintf("%d %s\n", SEND_LISTING, targ);
 593
 594         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 595                 fprintf(mfp, "%s\n", buf);
 596         }
 597
 598         fclose(mfp);
 599 }
 600
 601
 602 /* Don't show the names of private rooms unless the viewing
 603  * user also knows the rooms.
 604  */
 605 void GenerateRoomDisplay(char *real_room,
 606                         struct CitContext *viewed,
 607                         struct CitContext *viewer) {
 608
 609         int ra;
 610
 611         strcpy(real_room, viewed->room.QRname);
 612         if (viewed->room.QRflags & QR_MAILBOX) {
 613                 strcpy(real_room, &real_room[11]);
 614         }
 615         if (viewed->room.QRflags & QR_PRIVATE) {
 616                 CtdlRoomAccess(&viewed->room, &viewer->user, &ra, NULL);
 617                 if ( (ra & UA_KNOWN) == 0) {
 618                         strcpy(real_room, "<private room>");
 619                 }
 620         }
 621
 622         if (viewed->cs_flags & CS_CHAT) {
 623                 while (strlen(real_room) < 14)
 624                         strcat(real_room, " ");
 625
 626                 strcpy(&real_room[14], "<chat>");
 627         }
 628
 629 }
 630
 631 /*
 632  * Convenience function.
 633  */
 634 int CtdlAccessCheck(int required_level) {
 635
 636         if (CC->internal_pgm) return(0);
 637         if (required_level >= ac_internal) {
 638                 cprintf("%d This is not a user-level command.\n",
 639                         ERROR + HIGHER_ACCESS_REQUIRED);
 640                 return(-1);
 641         }
 642
 643         if ((required_level >= ac_logged_in) && (CC->logged_in == 0)) {
 644                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 645                 return(-1);
 646         }
 647
 648         if (CC->user.axlevel >= 6) return(0);
 649         if (required_level >= ac_aide) {
 650                 cprintf("%d This command requires Aide access.\n",
 651                         ERROR + HIGHER_ACCESS_REQUIRED);
 652                 return(-1);
 653         }
 654
 655         if (is_room_aide()) return(0);
 656         if (required_level >= ac_room_aide) {
 657                 cprintf("%d This command requires Aide or Room Aide access.\n",
 658                         ERROR + HIGHER_ACCESS_REQUIRED);
 659                 return(-1);
 660         }
 661
 662         /* shhh ... succeed quietly */
 663         return(0);
 664 }
 665
 666
 667
 668 /*
 669  * Terminate another running session
 670  */
 671 void cmd_term(char *cmdbuf)
 672 {
 673         int session_num;
 674         struct CitContext *ccptr;
 675         int found_it = 0;
 676         int allowed = 0;
 677
 678         session_num = extract_int(cmdbuf, 0);
 679         if (session_num == CC->cs_pid) {
 680                 cprintf("%d You can't kill your own session.\n", ERROR + ILLEGAL_VALUE);
 681                 return;
 682         }
 683
 684         lprintf(CTDL_DEBUG, "Locating session to kill\n");
 685         begin_critical_section(S_SESSION_TABLE);
 686         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 687                 if (session_num == ccptr->cs_pid) {
 688                         found_it = 1;
 689                         if ((ccptr->user.usernum == CC->user.usernum)
 690                            || (CC->user.axlevel >= 6)) {
 691                                 allowed = 1;
 692                                 ccptr->kill_me = 1;
 693                         }
 694                         else {
 695                                 allowed = 0;
 696                         }
 697                 }
 698         }
 699         end_critical_section(S_SESSION_TABLE);
 700
 701         if (found_it) {
 702                 if (allowed) {
 703                         cprintf("%d Session terminated.\n", CIT_OK);
 704                 }
 705                 else {
 706                         cprintf("%d You are not allowed to do that.\n",
 707                                 ERROR + HIGHER_ACCESS_REQUIRED);
 708                 }
 709         }
 710         else {
 711                 cprintf("%d No such session.\n", ERROR + ILLEGAL_VALUE);
 712         }
 713 }
 714
 715
 716
 717
 718
 719 /*
 720  * get the paginator prompt
 721  */
 722 void cmd_more(void) {
 723         cprintf("%d %s\n", CIT_OK, config.c_moreprompt);
 724 }
 725
 726 /*
 727  * echo
 728  */
 729 void cmd_echo(char *etext)
 730 {
 731         cprintf("%d %s\n", CIT_OK, etext);
 732 }
 733
 734
 735
 736 /*
 737  * identify as internal program
 738  */
 739 void cmd_ipgm(char *argbuf)
 740 {
 741         int secret;
 742
 743         secret = extract_int(argbuf, 0);
 744
 745         /* For security reasons, we do NOT allow this command to run
 746          * over the network.  Local sockets only.
 747          */
 748         if (!CC->is_local_socket) {
 749                 sleep(5);
 750                 cprintf("%d Authentication failed.\n",
 751                         ERROR + PASSWORD_REQUIRED);
 752         }
 753         else if (secret == config.c_ipgm_secret) {
 754                 CC->internal_pgm = 1;
 755                 strcpy(CC->curr_user, "<internal program>");
 756                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 757                 cprintf("%d Authenticated as an internal program.\n", CIT_OK);
 758         }
 759         else {
 760                 sleep(5);
 761                 cprintf("%d Authentication failed.\n",
 762                         ERROR + PASSWORD_REQUIRED);
 763                 lprintf(CTDL_ERR, "Warning: ipgm authentication failed.\n");
 764                 CC->kill_me = 1;
 765         }
 766
 767         /* Now change the ipgm secret for the next round.
 768          * (Disabled because it breaks concurrent scripts.  The fact that
 769          * we no longer accept IPGM over the network should be sufficient
 770          * to prevent brute-force attacks.  If you don't agree, uncomment
 771          * this block.)
 772         get_config();
 773         config.c_ipgm_secret = rand();
 774         put_config();
 775         */
 776 }
 777
 778
 779 /*
 780  * Shut down the server
 781  */
 782 void cmd_down(char *argbuf) {
 783         char *Reply ="%d Shutting down server.  Goodbye.\n";
 784
 785         if (CtdlAccessCheck(ac_aide)) return;
 786
 787         if (!IsEmptyStr(argbuf))
 788         {
 789                 int state = CIT_OK;
 790                 restart_server = extract_int(argbuf, 0);
 791
 792                 if (restart_server > 0)
 793                         Reply = "%d Restarting server.  See you soon.\n";
 794                 if ((restart_server > 0) && !running_as_daemon)
 795                 {
 796                         lprintf(CTDL_ERR, "The user requested restart, but not running as deamon! Geronimooooooo!\n");
 797                         Reply = "%d Warning, not running in deamon mode. maybe we will come up again, but don't lean on it.\n";
 798                         state = ERROR;
 799                 }
 800                 cprintf(Reply, state);
 801         }
 802         else
 803         {
 804                 cprintf(Reply, CIT_OK);
 805         }
 806         time_to_die = 1;
 807 }
 808
 809 /*
 810  * Halt the server without exiting the server process.
 811  */
 812 void cmd_halt(void) {
 813
 814         if (CtdlAccessCheck(ac_aide)) return;
 815
 816         cprintf("%d Halting server.  Goodbye.\n", CIT_OK);
 817         time_to_die = 1;
 818         shutdown_and_halt = 1;
 819 }
 820
 821 /*
 822  * Schedule or cancel a server shutdown
 823  */
 824 void cmd_scdn(char *argbuf)
 825 {
 826         int new_state;
 827         int state = CIT_OK;
 828         char *Reply = "%d %d\n";
 829
 830         if (CtdlAccessCheck(ac_aide)) return;
 831
 832         new_state = extract_int(argbuf, 0);
 833         if ((new_state == 2) || (new_state == 3))
 834         {
 835                 restart_server = 1;
 836                 if (!running_as_daemon)
 837                 {
 838                         lprintf(CTDL_ERR, "The user requested restart, but not running as deamon! Geronimooooooo!\n");
 839                         Reply = "%d %d Warning, not running in deamon mode. maybe we will come up again, but don't lean on it.\n";
 840                         state = ERROR;
 841                 }
 842
 843                 restart_server = extract_int(argbuf, 0);
 844                 new_state -= 2;
 845         }
 846         if ((new_state == 0) || (new_state == 1)) {
 847                 ScheduledShutdown = new_state;
 848         }
 849         cprintf(Reply, state, ScheduledShutdown);
 850 }
 851
 852
 853 /*
 854  * Set or unset asynchronous protocol mode
 855  */
 856 void cmd_asyn(char *argbuf)
 857 {
 858         int new_state;
 859
 860         new_state = extract_int(argbuf, 0);
 861         if ((new_state == 0) || (new_state == 1)) {
 862                 CC->is_async = new_state;
 863         }
 864         cprintf("%d %d\n", CIT_OK, CC->is_async);
 865 }
 866
 867
 868 /*
 869  * Generate a "nonce" for APOP-style authentication.
 870  *
 871  * RFC 1725 et al specify a PID to be placed in front of the nonce.
 872  * Quoth BTX: That would be stupid.
 873  */
 874 void generate_nonce(struct CitContext *con) {
 875         struct timeval tv;
 876
 877         memset(con->cs_nonce, NONCE_SIZE, 0);
 878         gettimeofday(&tv, NULL);
 879         memset(con->cs_nonce, NONCE_SIZE, 0);
 880         snprintf(con->cs_nonce, NONCE_SIZE, "<%d%ld@%s>",
 881                 rand(), (long)tv.tv_usec, config.c_fqdn);
 882 }
 883
 884
 885
 886
 887 /*
 888  * Back-end function for starting a session
 889  */
 890 void begin_session(struct CitContext *con)
 891 {
 892         socklen_t len;
 893         struct sockaddr_in sin;
 894
 895         /*
 896          * Initialize some variables specific to our context.
 897          */
 898         con->logged_in = 0;
 899         con->internal_pgm = 0;
 900         con->download_fp = NULL;
 901         con->upload_fp = NULL;
 902         con->FirstExpressMessage = NULL;
 903         time(&con->lastcmd);
 904         time(&con->lastidle);
 905         strcpy(con->lastcmdname, "    ");
 906         strcpy(con->cs_clientname, "(unknown)");
 907         strcpy(con->curr_user, NLI);
 908         strcpy(con->net_node, "");
 909         strcpy(con->fake_username, "");
 910         strcpy(con->fake_hostname, "");
 911         strcpy(con->fake_roomname, "");
 912         generate_nonce(con);
 913         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 914         safestrncpy(con->cs_addr, "", sizeof con->cs_addr);
 915         con->cs_host[sizeof con->cs_host - 1] = 0;
 916         len = sizeof sin;
 917         if (!CC->is_local_socket) {
 918                 if (!getpeername(con->client_socket, (struct sockaddr *) &sin, &len)) {
 919                         locate_host(con->cs_host, sizeof con->cs_host,
 920                                 con->cs_addr, sizeof con->cs_addr,
 921                                 &sin.sin_addr
 922                         );
 923                 }
 924         }
 925         else {
 926                 strcpy(con->cs_host, "");
 927         }
 928         con->cs_flags = 0;
 929         con->upload_type = UPL_FILE;
 930         con->dl_is_net = 0;
 931
 932         con->nologin = 0;
 933         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions)) {
 934                 con->nologin = 1;
 935         }
 936
 937         lprintf(CTDL_NOTICE, "Session started.\n");
 938
 939         /* Run any session startup routines registered by loadable modules */
 940         PerformSessionHooks(EVT_START);
 941 }
 942
 943
 944 void citproto_begin_session() {
 945         if (CC->nologin==1) {
 946                 cprintf("%d %s: Too many users are already online (maximum is %d)\n",
 947                         ERROR + MAX_SESSIONS_EXCEEDED,
 948                         config.c_nodename, config.c_maxsessions
 949                 );
 950                 CC->kill_me = 1;
 951         }
 952         else {
 953                 cprintf("%d %s Citadel server ready.\n",
 954                         CIT_OK, config.c_nodename);
 955         }
 956 }
 957
 958
 959
 960
 961 /*
 962  * This loop recognizes all server commands.
 963  */
 964 void do_command_loop(void) {
 965         char cmdbuf[SIZ];
 966
 967         time(&CC->lastcmd);
 968         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 969         if (client_getln(cmdbuf, sizeof cmdbuf) < 1) {
 970                 lprintf(CTDL_ERR, "Client disconnected: ending session.\n");
 971                 CC->kill_me = 1;
 972                 return;
 973         }
 974
 975         /* Log the server command, but don't show passwords... */
 976         if ( (strncasecmp(cmdbuf, "PASS", 4))
 977            && (strncasecmp(cmdbuf, "SETP", 4)) ) {
 978                 lprintf(CTDL_INFO, "%s\n", cmdbuf);
 979         }
 980         else {
 981                 lprintf(CTDL_INFO, "<password command sent>\n");
 982         }
 983
 984         buffer_output();
 985
 986         /*
 987          * Let other clients see the last command we executed, and
 988          * update the idle time, but not NOOP, QNOP, PEXP, GEXP, RWHO, or TIME.
 989          */
 990         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 991            && (strncasecmp(cmdbuf, "QNOP", 4))
 992            && (strncasecmp(cmdbuf, "PEXP", 4))
 993            && (strncasecmp(cmdbuf, "GEXP", 4))
 994            && (strncasecmp(cmdbuf, "RWHO", 4))
 995            && (strncasecmp(cmdbuf, "TIME", 4)) ) {
 996                 strcpy(CC->lastcmdname, "    ");
 997                 safestrncpy(CC->lastcmdname, cmdbuf, sizeof(CC->lastcmdname));
 998                 time(&CC->lastidle);
 999         }
1000
1001         if ((strncasecmp(cmdbuf, "ENT0", 4))
1002            && (strncasecmp(cmdbuf, "MESG", 4))
1003            && (strncasecmp(cmdbuf, "MSGS", 4)))
1004         {
1005            CC->cs_flags &= ~CS_POSTING;
1006         }
1007
1008         if (!strncasecmp(cmdbuf, "NOOP", 4)) {
1009                 cprintf("%d%cok\n", CIT_OK, CtdlCheckExpress() );
1010         }
1011
1012         else if (!strncasecmp(cmdbuf, "QNOP", 4)) {
1013                 /* do nothing, this command returns no response */
1014         }
1015
1016         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
1017                 cprintf("%d Goodbye.\n", CIT_OK);
1018                 CC->kill_me = 1;
1019         }
1020
1021         else if (!strncasecmp(cmdbuf,"ASYN",4)) {
1022                 cmd_asyn(&cmdbuf[5]);
1023         }
1024
1025         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
1026                 if (CC->logged_in) logout(CC);
1027                 cprintf("%d logged out.\n", CIT_OK);
1028         }
1029
1030         else if (!strncasecmp(cmdbuf,"USER",4)) {
1031                 cmd_user(&cmdbuf[5]);
1032         }
1033
1034         else if (!strncasecmp(cmdbuf,"PASS",4)) {
1035                 cmd_pass(&cmdbuf[5]);
1036         }
1037
1038         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
1039                 cmd_newu(&cmdbuf[5]);
1040         }
1041
1042         else if (!strncasecmp(cmdbuf,"CREU",4)) {
1043                 cmd_creu(&cmdbuf[5]);
1044         }
1045
1046         else if (!strncasecmp(cmdbuf,"SETP",4)) {
1047                 cmd_setp(&cmdbuf[5]);
1048         }
1049
1050         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
1051                 cmd_lrms(&cmdbuf[5]);
1052         }
1053
1054         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
1055                 cmd_lkra(&cmdbuf[5]);
1056         }
1057
1058         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
1059                 cmd_lkrn(&cmdbuf[5]);
1060         }
1061
1062         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
1063                 cmd_lkro(&cmdbuf[5]);
1064         }
1065
1066         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
1067                 cmd_lzrm(&cmdbuf[5]);
1068         }
1069
1070         else if (!strncasecmp(cmdbuf,"LPRM",4)) {
1071                 cmd_lprm(&cmdbuf[5]);
1072         }
1073
1074         else if (!strncasecmp(cmdbuf,"GETU",4)) {
1075                 cmd_getu();
1076         }
1077
1078         else if (!strncasecmp(cmdbuf,"SETU",4)) {
1079                 cmd_setu(&cmdbuf[5]);
1080         }
1081
1082         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
1083                 cmd_goto(&cmdbuf[5]);
1084         }
1085
1086         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
1087                 cmd_msgs(&cmdbuf[5]);
1088         }
1089
1090         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
1091                 cmd_whok();
1092         }
1093
1094         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
1095                 cmd_rdir();
1096         }
1097
1098         else if (!strncasecmp(cmdbuf,"EUID",4)) {
1099                 cmd_euid(&cmdbuf[5]);
1100         }
1101
1102         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
1103                 cmd_msg0(&cmdbuf[5]);
1104         }
1105
1106         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
1107                 cmd_msg2(&cmdbuf[5]);
1108         }
1109
1110         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
1111                 cmd_msg3(&cmdbuf[5]);
1112         }
1113
1114         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
1115                 cmd_msg4(&cmdbuf[5]);
1116         }
1117
1118         else if (!strncasecmp(cmdbuf,"MSGP",4)) {
1119                 cmd_msgp(&cmdbuf[5]);
1120         }
1121
1122         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
1123                 cmd_opna(&cmdbuf[5]);
1124         }
1125
1126         else if (!strncasecmp(cmdbuf,"DLAT",4)) {
1127                 cmd_dlat(&cmdbuf[5]);
1128         }
1129
1130         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1131                 cmd_info();
1132         }
1133
1134         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1135                 cmd_slrp(&cmdbuf[5]);
1136         }
1137
1138         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1139                 cmd_invt_kick(&cmdbuf[5],1);
1140         }
1141
1142         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1143                 cmd_invt_kick(&cmdbuf[5],0);
1144         }
1145
1146         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1147                 cmd_getr();
1148         }
1149
1150         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1151                 cmd_setr(&cmdbuf[5]);
1152         }
1153
1154         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1155                 cmd_geta();
1156         }
1157
1158         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1159                 cmd_seta(&cmdbuf[5]);
1160         }
1161
1162         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1163                 cmd_ent0(&cmdbuf[5]);
1164         }
1165
1166         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1167                 cmd_rinf();
1168         }
1169
1170         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1171                 cmd_dele(&cmdbuf[5]);
1172         }
1173
1174         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1175                 cmd_kill(&cmdbuf[5]);
1176         }
1177
1178         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1179                 cmd_cre8(&cmdbuf[5]);
1180         }
1181
1182         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1183                 cmd_move(&cmdbuf[5]);
1184         }
1185
1186         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1187                 cmd_forg();
1188         }
1189
1190         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1191                 cmd_mesg(&cmdbuf[5]);
1192         }
1193
1194         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1195                 cmd_emsg(&cmdbuf[5]);
1196         }
1197
1198         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1199                 cmd_gnur();
1200         }
1201
1202         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1203                 cmd_vali(&cmdbuf[5]);
1204         }
1205
1206         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1207                 cmd_einf(&cmdbuf[5]);
1208         }
1209
1210         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1211                 cmd_list(&cmdbuf[5]);
1212         }
1213
1214         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1215                 cmd_chek();
1216         }
1217
1218         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1219                 cmd_delf(&cmdbuf[5]);
1220         }
1221
1222         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1223                 cmd_movf(&cmdbuf[5]);
1224         }
1225
1226         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1227                 cmd_netf(&cmdbuf[5]);
1228         }
1229
1230         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1231                 cmd_open(&cmdbuf[5]);
1232         }
1233
1234         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1235                 cmd_clos();
1236         }
1237
1238         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1239                 cmd_uopn(&cmdbuf[5]);
1240         }
1241
1242         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1243                 cmd_ucls(&cmdbuf[5]);
1244         }
1245
1246         else if (!strncasecmp(cmdbuf,"READ",4)) {
1247                 cmd_read(&cmdbuf[5]);
1248         }
1249
1250         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1251                 cmd_writ(&cmdbuf[5]);
1252         }
1253
1254         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1255                 cmd_qusr(&cmdbuf[5]);
1256         }
1257
1258         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1259                 cmd_echo(&cmdbuf[5]);
1260         }
1261
1262         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1263                 cmd_oimg(&cmdbuf[5]);
1264         }
1265
1266         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1267                 cmd_more();
1268         }
1269
1270         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1271                 cmd_ndop(&cmdbuf[5]);
1272         }
1273
1274         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1275                 cmd_nuop(&cmdbuf[5]);
1276         }
1277
1278         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1279                 cmd_lflr();
1280         }
1281
1282         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1283                 cmd_cflr(&cmdbuf[5]);
1284         }
1285
1286         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1287                 cmd_kflr(&cmdbuf[5]);
1288         }
1289
1290         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1291                 cmd_eflr(&cmdbuf[5]);
1292         }
1293
1294         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1295                 cmd_iden(&cmdbuf[5]);
1296         }
1297
1298         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1299                 cmd_ipgm(&cmdbuf[5]);
1300         }
1301
1302         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1303                 cmd_term(&cmdbuf[5]);
1304         }
1305
1306         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1307                 cmd_down(&cmdbuf[5]);
1308         }
1309
1310         else if (!strncasecmp(cmdbuf,"HALT",4)) {
1311                 cmd_halt();
1312         }
1313
1314         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1315                 cmd_scdn(&cmdbuf[5]);
1316         }
1317
1318         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1319                 cmd_uimg(&cmdbuf[5]);
1320         }
1321
1322         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1323                 cmd_time();
1324         }
1325
1326         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1327                 cmd_agup(&cmdbuf[5]);
1328         }
1329
1330         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1331                 cmd_asup(&cmdbuf[5]);
1332         }
1333
1334         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1335                 cmd_gpex(&cmdbuf[5]);
1336         }
1337
1338         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1339                 cmd_spex(&cmdbuf[5]);
1340         }
1341
1342         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1343                 cmd_conf(&cmdbuf[5]);
1344         }
1345
1346         else if (!strncasecmp(cmdbuf, "SEEN", 4)) {
1347                 cmd_seen(&cmdbuf[5]);
1348         }
1349
1350         else if (!strncasecmp(cmdbuf, "GTSN", 4)) {
1351                 cmd_gtsn(&cmdbuf[5]);
1352         }
1353
1354         else if (!strncasecmp(cmdbuf, "VIEW", 4)) {
1355                 cmd_view(&cmdbuf[5]);
1356         }
1357
1358         else if (!strncasecmp(cmdbuf, "ISME", 4)) {
1359                 cmd_isme(&cmdbuf[5]);
1360         }
1361
1362         else if (!DLoader_Exec_Cmd(cmdbuf)) {
1363                 cprintf("%d Unrecognized or unsupported command.\n",
1364                         ERROR + CMD_NOT_SUPPORTED);
1365                }
1366
1367         unbuffer_output();
1368
1369         /* Run any after-each-command routines registered by modules */
1370         PerformSessionHooks(EVT_CMD);
1371 }
1372
1373
1374 /*
1375  * This loop performs all asynchronous functions.
1376  */
1377 void do_async_loop(void) {
1378         PerformSessionHooks(EVT_ASYNC);
1379 }