citadel/sysdep.c

   1 /*
   2  * $Id$
   3  *
   4  * Citadel "system dependent" stuff.
   5  * See COPYING for copyright information.
   6  *
   7  * Here's where we (hopefully) have most parts of the Citadel server that
   8  * would need to be altered to run the server in a non-POSIX environment.
   9  *
  10  * If we ever port to a different platform and either have multiple
  11  * variants of this file or simply load it up with #ifdefs.
  12  *
  13  */
  14
  15 #include "sysdep.h"
  16 #include <stdlib.h>
  17 #include <unistd.h>
  18 #include <stdio.h>
  19 #include <fcntl.h>
  20 #include <ctype.h>
  21 #include <signal.h>
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <sys/wait.h>
  25 #include <sys/socket.h>
  26 #include <syslog.h>
  27 #include <sys/syslog.h>
  28
  29 #if TIME_WITH_SYS_TIME
  30 # include <sys/time.h>
  31 # include <time.h>
  32 #else
  33 # if HAVE_SYS_TIME_H
  34 #  include <sys/time.h>
  35 # else
  36 #  include <time.h>
  37 # endif
  38 #endif
  39
  40 #include <limits.h>
  41 #include <sys/resource.h>
  42 #include <netinet/in.h>
  43 #include <netinet/tcp.h>
  44 #include <arpa/inet.h>
  45 #include <netdb.h>
  46 #include <sys/un.h>
  47 #include <string.h>
  48 #include <pwd.h>
  49 #include <errno.h>
  50 #include <stdarg.h>
  51 #include <grp.h>
  52 #include <libcitadel.h>
  53 #include "citadel.h"
  54 #include "server.h"
  55 #include "sysdep_decls.h"
  56 #include "citserver.h"
  57 #include "support.h"
  58 #include "config.h"
  59 #include "database.h"
  60 #include "housekeeping.h"
  61 #include "modules/crypto/serv_crypto.h" /* Needed for init_ssl, client_write_ssl, client_read_ssl, destruct_ssl */
  62 #include "ecrash.h"
  63
  64 #ifdef HAVE_SYS_SELECT_H
  65 #include <sys/select.h>
  66 #endif
  67
  68 #ifndef HAVE_SNPRINTF
  69 #include "snprintf.h"
  70 #endif
  71
  72 #include "ctdl_module.h"
  73 #include "threads.h"
  74 #include "user_ops.h"
  75 #include "control.h"
  76
  77
  78 #ifdef DEBUG_MEMORY_LEAKS
  79 struct igheap {
  80         struct igheap *next;
  81         char file[32];
  82         int line;
  83         void *block;
  84 };
  85
  86 struct igheap *igheap = NULL;
  87 #endif
  88
  89
  90 citthread_key_t MyConKey;                               /* TSD key for MyContext() */
  91
  92 int verbosity = DEFAULT_VERBOSITY;              /* Logging level */
  93
  94 struct CitContext masterCC;
  95 time_t last_purge = 0;                          /* Last dead session purge */
  96 int num_sessions = 0;                           /* Current number of sessions */
  97
  98 int syslog_facility = LOG_DAEMON;
  99 int enable_syslog = 0;
 100
 101
 102 /* Flag for single user mode */
 103 static int want_single_user = 0;
 104
 105 /* Try to go single user */
 106
 107 int CtdlTrySingleUser(void)
 108 {
 109         int can_do = 0;
 110
 111         begin_critical_section(S_SINGLE_USER);
 112         if (want_single_user)
 113                 can_do = 0;
 114         else
 115         {
 116                 can_do = 1;
 117                 want_single_user = 1;
 118         }
 119         end_critical_section(S_SINGLE_USER);
 120         return can_do;
 121 }
 122
 123 void CtdlEndSingleUser(void)
 124 {
 125         begin_critical_section(S_SINGLE_USER);
 126         want_single_user = 0;
 127         end_critical_section(S_SINGLE_USER);
 128 }
 129
 130
 131 int CtdlWantSingleUser(void)
 132 {
 133         return want_single_user;
 134 }
 135
 136 int CtdlIsSingleUser(void)
 137 {
 138         if (want_single_user)
 139         {
 140                 /* check for only one context here */
 141                 if (num_sessions == 1)
 142                         return TRUE;
 143         }
 144         return FALSE;
 145 }
 146
 147
 148 /*
 149  * CtdlLogPrintf()  ...   Write logging information
 150  */
 151 void CtdlLogPrintf(enum LogLevel loglevel, const char *format, ...) {
 152         va_list arg_ptr;
 153         va_start(arg_ptr, format);
 154         vCtdlLogPrintf(loglevel, format, arg_ptr);
 155         va_end(arg_ptr);
 156 }
 157
 158 void vCtdlLogPrintf(enum LogLevel loglevel, const char *format, va_list arg_ptr)
 159 {
 160         char buf[SIZ], buf2[SIZ];
 161
 162         if (enable_syslog) {
 163                 vsyslog((syslog_facility | loglevel), format, arg_ptr);
 164         }
 165
 166         /* stderr output code */
 167         if (enable_syslog || running_as_daemon) return;
 168
 169         /* if we run in forground and syslog is disabled, log to terminal */
 170         if (loglevel <= verbosity) {
 171                 struct timeval tv;
 172                 struct tm tim;
 173                 time_t unixtime;
 174
 175                 gettimeofday(&tv, NULL);
 176                 /* Promote to time_t; types differ on some OSes (like darwin) */
 177                 unixtime = tv.tv_sec;
 178                 localtime_r(&unixtime, &tim);
 179                 if (CC->cs_pid != 0) {
 180                         sprintf(buf,
 181                                 "%04d/%02d/%02d %2d:%02d:%02d.%06ld [%3d] ",
 182                                 tim.tm_year + 1900, tim.tm_mon + 1,
 183                                 tim.tm_mday, tim.tm_hour, tim.tm_min,
 184                                 tim.tm_sec, (long)tv.tv_usec,
 185                                 CC->cs_pid);
 186                 } else {
 187                         sprintf(buf,
 188                                 "%04d/%02d/%02d %2d:%02d:%02d.%06ld ",
 189                                 tim.tm_year + 1900, tim.tm_mon + 1,
 190                                 tim.tm_mday, tim.tm_hour, tim.tm_min,
 191                                 tim.tm_sec, (long)tv.tv_usec);
 192                 }
 193                 vsnprintf(buf2, SIZ, format, arg_ptr);
 194
 195                 fprintf(stderr, "%s%s", buf, buf2);
 196                 fflush(stderr);
 197         }
 198 }
 199
 200
 201
 202 /*
 203  * Signal handler to shut down the server.
 204  */
 205
 206 volatile int exit_signal = 0;
 207 volatile int shutdown_and_halt = 0;
 208 volatile int restart_server = 0;
 209 volatile int running_as_daemon = 0;
 210
 211 static RETSIGTYPE signal_cleanup(int signum) {
 212 #ifdef THREADS_USESIGNALS
 213         if (CT)
 214                 CT->signal = signum;
 215         else
 216 #endif
 217         {
 218                 CtdlLogPrintf(CTDL_DEBUG, "Caught signal %d; shutting down.\n", signum);
 219                 exit_signal = signum;
 220         }
 221 }
 222
 223
 224
 225 /*
 226  * Some initialization stuff...
 227  */
 228 void init_sysdep(void) {
 229         sigset_t set;
 230
 231         /* Avoid vulnerabilities related to FD_SETSIZE if we can. */
 232 #ifdef FD_SETSIZE
 233 #ifdef RLIMIT_NOFILE
 234         struct rlimit rl;
 235         getrlimit(RLIMIT_NOFILE, &rl);
 236         rl.rlim_cur = FD_SETSIZE;
 237         rl.rlim_max = FD_SETSIZE;
 238         setrlimit(RLIMIT_NOFILE, &rl);
 239 #endif
 240 #endif
 241
 242         /* If we've got OpenSSL, we're going to use it. */
 243 #ifdef HAVE_OPENSSL
 244         init_ssl();
 245 #endif
 246
 247         /*
 248          * Set up a place to put thread-specific data.
 249          * We only need a single pointer per thread - it points to the
 250          * CitContext structure (in the ContextList linked list) of the
 251          * session to which the calling thread is currently bound.
 252          */
 253         if (citthread_key_create(&MyConKey, NULL) != 0) {
 254                 CtdlLogPrintf(CTDL_CRIT, "Can't create TSD key: %s\n",
 255                         strerror(errno));
 256         }
 257
 258         /*
 259          * The action for unexpected signals and exceptions should be to
 260          * call signal_cleanup() to gracefully shut down the server.
 261          */
 262         sigemptyset(&set);
 263         sigaddset(&set, SIGINT);
 264         sigaddset(&set, SIGQUIT);
 265         sigaddset(&set, SIGHUP);
 266         sigaddset(&set, SIGTERM);
 267         // sigaddset(&set, SIGSEGV);    commented out because
 268         // sigaddset(&set, SIGILL);     we want core dumps
 269         // sigaddset(&set, SIGBUS);
 270         sigprocmask(SIG_UNBLOCK, &set, NULL);
 271
 272         signal(SIGINT, signal_cleanup);
 273         signal(SIGQUIT, signal_cleanup);
 274         signal(SIGHUP, signal_cleanup);
 275         signal(SIGTERM, signal_cleanup);
 276         // signal(SIGSEGV, signal_cleanup);     commented out because
 277         // signal(SIGILL, signal_cleanup);      we want core dumps
 278         // signal(SIGBUS, signal_cleanup);
 279
 280         /*
 281          * Do not shut down the server on broken pipe signals, otherwise the
 282          * whole Citadel service would come down whenever a single client
 283          * socket breaks.
 284          */
 285         signal(SIGPIPE, SIG_IGN);
 286 }
 287
 288
 289
 290
 291 /*
 292  * This is a generic function to set up a master socket for listening on
 293  * a TCP port.  The server shuts down if the bind fails.
 294  *
 295  */
 296 int ig_tcp_server(char *ip_addr, int port_number, int queue_len, char **errormessage)
 297 {
 298         struct sockaddr_in sin;
 299         int s, i;
 300         int actual_queue_len;
 301
 302         actual_queue_len = queue_len;
 303         if (actual_queue_len < 5) actual_queue_len = 5;
 304
 305         memset(&sin, 0, sizeof(sin));
 306         sin.sin_family = AF_INET;
 307         sin.sin_port = htons((u_short)port_number);
 308         if (ip_addr == NULL) {
 309                 sin.sin_addr.s_addr = INADDR_ANY;
 310         }
 311         else {
 312                 sin.sin_addr.s_addr = inet_addr(ip_addr);
 313         }
 314
 315         if (sin.sin_addr.s_addr == !INADDR_ANY) {
 316                 sin.sin_addr.s_addr = INADDR_ANY;
 317         }
 318
 319         s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 320
 321         if (s < 0) {
 322                 *errormessage = (char*) malloc(SIZ + 1);
 323                 snprintf(*errormessage, SIZ,
 324                                  "citserver: Can't create a socket: %s",
 325                                  strerror(errno));
 326                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 327                 return(-1);
 328         }
 329
 330         i = 1;
 331         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 332
 333         if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
 334                 *errormessage = (char*) malloc(SIZ + 1);
 335                 snprintf(*errormessage, SIZ,
 336                                  "citserver: Can't bind: %s",
 337                                  strerror(errno));
 338                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 339                 close(s);
 340                 return(-1);
 341         }
 342
 343         /* set to nonblock - we need this for some obscure situations */
 344         if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
 345                 *errormessage = (char*) malloc(SIZ + 1);
 346                 snprintf(*errormessage, SIZ,
 347                                  "citserver: Can't set socket to non-blocking: %s",
 348                                  strerror(errno));
 349                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 350                 close(s);
 351                 return(-1);
 352         }
 353
 354         if (listen(s, actual_queue_len) < 0) {
 355                 *errormessage = (char*) malloc(SIZ + 1);
 356                 snprintf(*errormessage, SIZ,
 357                                  "citserver: Can't listen: %s",
 358                                  strerror(errno));
 359                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 360                 close(s);
 361                 return(-1);
 362         }
 363
 364         return(s);
 365 }
 366
 367
 368
 369 /*
 370  * Create a Unix domain socket and listen on it
 371  */
 372 int ig_uds_server(char *sockpath, int queue_len, char **errormessage)
 373 {
 374         struct sockaddr_un addr;
 375         int s;
 376         int i;
 377         int actual_queue_len;
 378
 379         actual_queue_len = queue_len;
 380         if (actual_queue_len < 5) actual_queue_len = 5;
 381
 382         i = unlink(sockpath);
 383         if ((i != 0) && (errno != ENOENT)) {
 384                 *errormessage = (char*) malloc(SIZ + 1);
 385                 snprintf(*errormessage, SIZ, "citserver: can't unlink %s: %s",
 386                         sockpath, strerror(errno));
 387                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 388                 return(-1);
 389         }
 390
 391         memset(&addr, 0, sizeof(addr));
 392         addr.sun_family = AF_UNIX;
 393         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 394
 395         s = socket(AF_UNIX, SOCK_STREAM, 0);
 396         if (s < 0) {
 397                 *errormessage = (char*) malloc(SIZ + 1);
 398                 snprintf(*errormessage, SIZ,
 399                          "citserver: Can't create a socket: %s",
 400                          strerror(errno));
 401                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 402                 return(-1);
 403         }
 404
 405         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 406                 *errormessage = (char*) malloc(SIZ + 1);
 407                 snprintf(*errormessage, SIZ,
 408                          "citserver: Can't bind: %s",
 409                          strerror(errno));
 410                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 411                 return(-1);
 412         }
 413
 414         /* set to nonblock - we need this for some obscure situations */
 415         if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
 416                 *errormessage = (char*) malloc(SIZ + 1);
 417                 snprintf(*errormessage, SIZ,
 418                          "citserver: Can't set socket to non-blocking: %s",
 419                          strerror(errno));
 420                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 421                 close(s);
 422                 return(-1);
 423         }
 424
 425         if (listen(s, actual_queue_len) < 0) {
 426                 *errormessage = (char*) malloc(SIZ + 1);
 427                 snprintf(*errormessage, SIZ,
 428                          "citserver: Can't listen: %s",
 429                          strerror(errno));
 430                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 431                 return(-1);
 432         }
 433
 434         chmod(sockpath, S_ISGID|S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
 435         return(s);
 436 }
 437
 438
 439
 440 /*
 441  * Return a pointer to the CitContext structure bound to the thread which
 442  * called this function.  If there's no such binding (for example, if it's
 443  * called by the housekeeper thread) then a generic 'master' CC is returned.
 444  *
 445  * This function is used *VERY* frequently and must be kept small.
 446  */
 447 struct CitContext *MyContext(void) {
 448
 449         register struct CitContext *c;
 450
 451         return ((c = (struct CitContext *) citthread_getspecific(MyConKey),
 452                 c == NULL) ? &masterCC : c
 453         );
 454 }
 455
 456
 457 /*
 458  * Initialize a new context and place it in the list.  The session number
 459  * used to be the PID (which is why it's called cs_pid), but that was when we
 460  * had one process per session.  Now we just assign them sequentially, starting
 461  * at 1 (don't change it to 0 because masterCC uses 0).
 462  */
 463 struct CitContext *CreateNewContext(void) {
 464         struct CitContext *me;
 465         static int next_pid = 0;
 466
 467         me = (struct CitContext *) malloc(sizeof(struct CitContext));
 468         if (me == NULL) {
 469                 CtdlLogPrintf(CTDL_ALERT, "citserver: can't allocate memory!!\n");
 470                 return NULL;
 471         }
 472
 473         memset(me, 0, sizeof(struct CitContext));
 474
 475         /* Give the contaxt a name. Hopefully makes it easier to track */
 476         strcpy (me->user.fullname, "SYS_notauth");
 477
 478         /* The new context will be created already in the CON_EXECUTING state
 479          * in order to prevent another thread from grabbing it while it's
 480          * being set up.
 481          */
 482         me->state = CON_EXECUTING;
 483         /*
 484          * Generate a unique session number and insert this context into
 485          * the list.
 486          */
 487         begin_critical_section(S_SESSION_TABLE);
 488         me->cs_pid = ++next_pid;
 489         me->prev = NULL;
 490         me->next = ContextList;
 491         ContextList = me;
 492         if (me->next != NULL) {
 493                 me->next->prev = me;
 494         }
 495         ++num_sessions;
 496         end_critical_section(S_SESSION_TABLE);
 497         return (me);
 498 }
 499
 500
 501 struct CitContext *CtdlGetContextArray(int *count)
 502 {
 503         int nContexts, i;
 504         struct CitContext *nptr, *cptr;
 505
 506         nContexts = num_sessions;
 507         nptr = malloc(sizeof(struct CitContext) * nContexts);
 508         if (!nptr)
 509                 return NULL;
 510         begin_critical_section(S_SESSION_TABLE);
 511         for (cptr = ContextList, i=0; cptr != NULL && i < nContexts; cptr = cptr->next, i++)
 512                 memcpy(&nptr[i], cptr, sizeof (struct CitContext));
 513         end_critical_section (S_SESSION_TABLE);
 514
 515         *count = i;
 516         return nptr;
 517 }
 518
 519
 520
 521 /**
 522  * This function fills in a context and its user field correctly
 523  * Then creates/loads that user
 524  */
 525 void CtdlFillSystemContext(struct CitContext *context, char *name)
 526 {
 527         char sysname[USERNAME_SIZE];
 528
 529         memset(context, 0, sizeof(struct CitContext));
 530         context->internal_pgm = 1;
 531         context->cs_pid = 0;
 532         strcpy (sysname, "SYS_");
 533         strcat (sysname, name);
 534         /* internal_create_user has the side effect of loading the user regardless of wether they
 535          * already existed or needed to be created
 536          */
 537         internal_create_user (sysname, &(context->user), -1) ;
 538
 539         /* Check to see if the system user needs upgrading */
 540         if (context->user.usernum == 0)
 541         {       /* old system user with number 0, upgrade it */
 542                 context->user.usernum = get_new_user_number();
 543                 CtdlLogPrintf(CTDL_DEBUG, "Upgrading system user \"%s\" from user number 0 to user number %d\n", context->user.fullname, context->user.usernum);
 544                 /* add user to the database */
 545                 putuser(&(context->user));
 546                 cdb_store(CDB_USERSBYNUMBER, &(context->user.usernum), sizeof(long), context->user.fullname, strlen(context->user.fullname)+1);
 547         }
 548 }
 549
 550 /*
 551  * The following functions implement output buffering on operating systems which
 552  * support it (such as Linux and various BSD flavors).
 553  */
 554 #ifndef HAVE_DARWIN
 555 #ifdef TCP_CORK
 556 #       define HAVE_TCP_BUFFERING
 557 #else
 558 #       ifdef TCP_NOPUSH
 559 #               define HAVE_TCP_BUFFERING
 560 #               define TCP_CORK TCP_NOPUSH
 561 #       endif
 562 #endif /* TCP_CORK */
 563 #endif /* HAVE_DARWIN */
 564
 565 static unsigned on = 1, off = 0;
 566
 567 void buffer_output(void) {
 568 #ifdef HAVE_TCP_BUFFERING
 569         setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 570 #endif
 571 }
 572
 573 void unbuffer_output(void) {
 574 #ifdef HAVE_TCP_BUFFERING
 575         setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 576 #endif
 577 }
 578
 579 void flush_output(void) {
 580 #ifdef HAVE_TCP_BUFFERING
 581         struct CitContext *CCC = CC;
 582         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 583         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 584 #endif
 585 }
 586
 587
 588
 589 /*
 590  * client_write()   ...    Send binary data to the client.
 591  */
 592 int client_write(char *buf, int nbytes)
 593 {
 594         int bytes_written = 0;
 595         int retval;
 596 #ifndef HAVE_TCP_BUFFERING
 597         int old_buffer_len = 0;
 598 #endif
 599         fd_set wset;
 600         t_context *Ctx;
 601         int fdflags;
 602
 603         Ctx = CC;
 604         if (Ctx->redirect_buffer != NULL) {
 605                 if ((Ctx->redirect_len + nbytes + 2) >= Ctx->redirect_alloc) {
 606                         Ctx->redirect_alloc = (Ctx->redirect_alloc * 2) + nbytes;
 607                         Ctx->redirect_buffer = realloc(Ctx->redirect_buffer,
 608                                                 Ctx->redirect_alloc);
 609                 }
 610                 memcpy(&Ctx->redirect_buffer[Ctx->redirect_len], buf, nbytes);
 611                 Ctx->redirect_len += nbytes;
 612                 Ctx->redirect_buffer[Ctx->redirect_len] = 0;
 613                 return 0;
 614         }
 615
 616 #ifdef HAVE_OPENSSL
 617         if (Ctx->redirect_ssl) {
 618                 client_write_ssl(buf, nbytes);
 619                 return 0;
 620         }
 621 #endif
 622
 623         fdflags = fcntl(Ctx->client_socket, F_GETFL);
 624
 625         while (bytes_written < nbytes) {
 626                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 627                         FD_ZERO(&wset);
 628                         FD_SET(Ctx->client_socket, &wset);
 629                         if (select(1, NULL, &wset, NULL, NULL) == -1) {
 630                                 CtdlLogPrintf(CTDL_ERR,
 631                                         "client_write(%d bytes) select failed: %s (%d)\n",
 632                                         nbytes - bytes_written,
 633                                         strerror(errno), errno);
 634                                 cit_backtrace();
 635                                 Ctx->kill_me = 1;
 636                                 return -1;
 637                         }
 638                 }
 639
 640                 retval = write(Ctx->client_socket, &buf[bytes_written],
 641                         nbytes - bytes_written);
 642                 if (retval < 1) {
 643                         CtdlLogPrintf(CTDL_ERR,
 644                                 "client_write(%d bytes) failed: %s (%d)\n",
 645                                 nbytes - bytes_written,
 646                                 strerror(errno), errno);
 647                         cit_backtrace();
 648                         // CtdlLogPrintf(CTDL_DEBUG, "Tried to send: %s",  &buf[bytes_written]);
 649                         Ctx->kill_me = 1;
 650                         return -1;
 651                 }
 652                 bytes_written = bytes_written + retval;
 653         }
 654         return 0;
 655 }
 656
 657
 658 /*
 659  * cprintf()    Send formatted printable data to the client.
 660  *              Implemented in terms of client_write() so it's technically not sysdep...
 661  */
 662 void cprintf(const char *format, ...) {
 663         va_list arg_ptr;
 664         char buf[1024];
 665
 666         va_start(arg_ptr, format);
 667         if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
 668                 buf[sizeof buf - 2] = '\n';
 669         client_write(buf, strlen(buf));
 670         va_end(arg_ptr);
 671 }
 672
 673
 674 /*
 675  * Read data from the client socket.
 676  * Return values are:
 677  *      1       Requested number of bytes has been read.
 678  *      0       Request timed out.
 679  *      -1      The socket is broken.
 680  * If the socket breaks, the session will be terminated.
 681  */
 682 int client_read_to(char *buf, int bytes, int timeout)
 683 {
 684         int len,rlen;
 685         fd_set rfds;
 686         int fd;
 687         struct timeval tv;
 688         int retval;
 689
 690 #ifdef HAVE_OPENSSL
 691         if (CC->redirect_ssl) {
 692                 return (client_read_ssl(buf, bytes, timeout));
 693         }
 694 #endif
 695         len = 0;
 696         fd = CC->client_socket;
 697         while(len<bytes) {
 698                 FD_ZERO(&rfds);
 699                 FD_SET(fd, &rfds);
 700                 tv.tv_sec = timeout;
 701                 tv.tv_usec = 0;
 702
 703                 retval = select( (fd)+1,
 704                                  &rfds, NULL, NULL, &tv);
 705                 if (retval < 0)
 706                 {
 707                         if (errno == EINTR)
 708                         {
 709                                 CtdlLogPrintf(CTDL_DEBUG, "Interrupted select().\n");
 710                                 CC->kill_me = 1;
 711                                 return (-1);
 712                         }
 713                 }
 714
 715                 if (FD_ISSET(fd, &rfds) == 0) {
 716                         return(0);
 717                 }
 718
 719                 rlen = read(fd, &buf[len], bytes-len);
 720                 if (rlen<1) {
 721                         /* The socket has been disconnected! */
 722                         CC->kill_me = 1;
 723                         return(-1);
 724                 }
 725                 len = len + rlen;
 726         }
 727         return(1);
 728 }
 729
 730 /*
 731  * Read data from the client socket with default timeout.
 732  * (This is implemented in terms of client_read_to() and could be
 733  * justifiably moved out of sysdep.c)
 734  */
 735 INLINE int client_read(char *buf, int bytes)
 736 {
 737         return(client_read_to(buf, bytes, config.c_sleeping));
 738 }
 739
 740
 741 /*
 742  * client_getln()   ...   Get a LF-terminated line of text from the client.
 743  * (This is implemented in terms of client_read() and could be
 744  * justifiably moved out of sysdep.c)
 745  */
 746 int client_getln(char *buf, int bufsize)
 747 {
 748         int i, retval;
 749
 750         /* Read one character at a time.
 751          */
 752         for (i = 0;;i++) {
 753                 retval = client_read(&buf[i], 1);
 754                 if (retval != 1 || buf[i] == '\n' || i == (bufsize-1))
 755                         break;
 756         }
 757
 758         /* If we got a long line, discard characters until the newline.
 759          */
 760         if (i == (bufsize-1))
 761                 while (buf[i] != '\n' && retval == 1)
 762                         retval = client_read(&buf[i], 1);
 763
 764         /* Strip the trailing LF, and the trailing CR if present.
 765          */
 766         buf[i] = 0;
 767         while ( (i > 0)
 768                 && ( (buf[i - 1]==13)
 769                      || ( buf[i - 1]==10)) ) {
 770                 i--;
 771                 buf[i] = 0;
 772         }
 773         if (retval < 0) safestrncpy(&buf[i], "000", bufsize - i);
 774         return(retval);
 775 }
 776
 777
 778 /*
 779  * Cleanup any contexts that are left lying around
 780  */
 781 void context_cleanup(void)
 782 {
 783         struct CitContext *ptr = NULL;
 784         struct CitContext *rem = NULL;
 785
 786         /*
 787          * Clean up the contexts.
 788          * There are no threads so no critical_section stuff is needed.
 789          */
 790         ptr = ContextList;
 791
 792         /* We need to update the ContextList because some modules may want to itterate it
 793          * Question is should we NULL it before iterating here or should we just keep updating it
 794          * as we remove items?
 795          *
 796          * Answer is to NULL it first to prevent modules from doing any actions on the list at all
 797          */
 798         ContextList=NULL;
 799         while (ptr != NULL){
 800                 /* Remove the session from the active list */
 801                 rem = ptr->next;
 802                 --num_sessions;
 803
 804                 CtdlLogPrintf(CTDL_DEBUG, "Purging session %d\n", ptr->cs_pid);
 805                 RemoveContext(ptr);
 806                 free (ptr);
 807                 ptr = rem;
 808         }
 809 }
 810
 811
 812
 813 void close_masters (void)
 814 {
 815         struct ServiceFunctionHook *serviceptr;
 816
 817         /*
 818          * close all protocol master sockets
 819          */
 820         for (serviceptr = ServiceHookTable; serviceptr != NULL;
 821             serviceptr = serviceptr->next ) {
 822
 823                 if (serviceptr->tcp_port > 0)
 824                 {
 825                         CtdlLogPrintf(CTDL_INFO, "Closing listener on port %d\n",
 826                                 serviceptr->tcp_port);
 827                         serviceptr->tcp_port = 0;
 828                 }
 829
 830                 if (serviceptr->sockpath != NULL)
 831                         CtdlLogPrintf(CTDL_INFO, "Closing listener on '%s'\n",
 832                                 serviceptr->sockpath);
 833
 834                 close(serviceptr->msock);
 835                 /* If it's a Unix domain socket, remove the file. */
 836                 if (serviceptr->sockpath != NULL) {
 837                         unlink(serviceptr->sockpath);
 838                         serviceptr->sockpath = NULL;
 839                 }
 840         }
 841 }
 842
 843
 844 /*
 845  * The system-dependent part of master_cleanup() - close the master socket.
 846  */
 847 void sysdep_master_cleanup(void) {
 848
 849         close_masters();
 850
 851         context_cleanup();
 852
 853 #ifdef HAVE_OPENSSL
 854         destruct_ssl();
 855 #endif
 856         CtdlDestroyProtoHooks();
 857         CtdlDestroyDeleteHooks();
 858         CtdlDestroyXmsgHooks();
 859         CtdlDestroyNetprocHooks();
 860         CtdlDestroyUserHooks();
 861         CtdlDestroyMessageHook();
 862         CtdlDestroyCleanupHooks();
 863         CtdlDestroyFixedOutputHooks();
 864         CtdlDestroySessionHooks();
 865         CtdlDestroyServiceHook();
 866         CtdlDestroyRoomHooks();
 867         CtdlDestroyDirectoryServiceFuncs();
 868         #ifdef HAVE_BACKTRACE
 869         eCrash_Uninit();
 870         #endif
 871 }
 872
 873
 874
 875 /*
 876  * Terminate another session.
 877  * (This could justifiably be moved out of sysdep.c because it
 878  * no longer does anything that is system-dependent.)
 879  */
 880 void kill_session(int session_to_kill) {
 881         struct CitContext *ptr;
 882
 883         begin_critical_section(S_SESSION_TABLE);
 884         for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
 885                 if (ptr->cs_pid == session_to_kill) {
 886                         ptr->kill_me = 1;
 887                 }
 888         }
 889         end_critical_section(S_SESSION_TABLE);
 890 }
 891
 892 pid_t current_child;
 893 void graceful_shutdown(int signum) {
 894         kill(current_child, signum);
 895         unlink(file_pid_file);
 896         exit(0);
 897 }
 898
 899 int nFireUps = 0;
 900 int nFireUpsNonRestart = 0;
 901 pid_t ForkedPid = 1;
 902
 903 /*
 904  * Start running as a daemon.
 905  */
 906 void start_daemon(int unused) {
 907         int status = 0;
 908         pid_t child = 0;
 909         FILE *fp;
 910         int do_restart = 0;
 911
 912         current_child = 0;
 913
 914         /* Close stdin/stdout/stderr and replace them with /dev/null.
 915          * We don't just call close() because we don't want these fd's
 916          * to be reused for other files.
 917          */
 918         chdir(ctdl_run_dir);
 919
 920         child = fork();
 921         if (child != 0) {
 922                 exit(0);
 923         }
 924
 925         signal(SIGHUP, SIG_IGN);
 926         signal(SIGINT, SIG_IGN);
 927         signal(SIGQUIT, SIG_IGN);
 928
 929         setsid();
 930         umask(0);
 931         freopen("/dev/null", "r", stdin);
 932         freopen("/dev/null", "w", stdout);
 933         freopen("/dev/null", "w", stderr);
 934
 935         do {
 936                 current_child = fork();
 937
 938                 signal(SIGTERM, graceful_shutdown);
 939
 940                 if (current_child < 0) {
 941                         perror("fork");
 942                         exit(errno);
 943                 }
 944
 945                 else if (current_child == 0) {
 946                         return; /* continue starting citadel. */
 947                 }
 948
 949                 else {
 950                         fp = fopen(file_pid_file, "w");
 951                         if (fp != NULL) {
 952                                 fprintf(fp, ""F_PID_T"\n", getpid());
 953                                 fclose(fp);
 954                         }
 955                         waitpid(current_child, &status, 0);
 956                 }
 957                 do_restart = 0;
 958                 nFireUpsNonRestart = nFireUps;
 959                 /* Did the main process exit with an actual exit code? */
 960                 if (WIFEXITED(status)) {
 961
 962                         /* Exit code 0 means the watcher should exit */
 963                         if (WEXITSTATUS(status) == 0) {
 964                                 do_restart = 0;
 965                         }
 966
 967                         /* Exit code 101-109 means the watcher should exit */
 968                         else if ( (WEXITSTATUS(status) >= 101) && (WEXITSTATUS(status) <= 109) ) {
 969                                 do_restart = 0;
 970                         }
 971
 972                         /* Any other exit code means we should restart. */
 973                         else {
 974                                 do_restart = 1;
 975                                 nFireUps++;
 976                                 ForkedPid = current_child;
 977                         }
 978                 }
 979
 980                 /* Any other type of termination (signals, etc.) should also restart. */
 981                 else {
 982                         do_restart = 1;
 983                         nFireUps++;
 984                         ForkedPid = current_child;
 985                 }
 986
 987         } while (do_restart);
 988
 989         unlink(file_pid_file);
 990         exit(WEXITSTATUS(status));
 991 }
 992
 993
 994
 995 void checkcrash(void)
 996 {
 997         if (nFireUpsNonRestart != nFireUps)
 998         {
 999                 StrBuf *CrashMail;
1000
1001                 CrashMail = NewStrBuf();
1002                 CtdlLogPrintf (CTDL_ALERT, "----------------sending crash mail\n");
1003                 StrBufPrintf(CrashMail,
1004                              "Your CitServer is just recovering from an unexpected termination.\n"
1005                              " this maybe the result of an error in citserver or an external influence.\n"
1006                              " You can get more information on this by enabling coredumping; for more information see\n"
1007                              " http://citadel.org/doku.php/faq:mastering_your_os:gdb#how.do.i.make.my.system.produce.core-files\n"
1008                              " If you already did, the file you're looking for most probably is %score.%d\n"
1009                              " Yours faithfully...",
1010                              ctdl_run_dir, ForkedPid);
1011                 aide_message(ChrPtr(CrashMail), "Citadel server crashed.");
1012                 FreeStrBuf(&CrashMail);
1013         }
1014 }
1015
1016
1017 /*
1018  * Generic routine to convert a login name to a full name (gecos)
1019  * Returns nonzero if a conversion took place
1020  */
1021 int convert_login(char NameToConvert[]) {
1022         struct passwd *pw;
1023         int a;
1024
1025         pw = getpwnam(NameToConvert);
1026         if (pw == NULL) {
1027                 return(0);
1028         }
1029         else {
1030                 strcpy(NameToConvert, pw->pw_gecos);
1031                 for (a=0; a<strlen(NameToConvert); ++a) {
1032                         if (NameToConvert[a] == ',') NameToConvert[a] = 0;
1033                 }
1034                 return(1);
1035         }
1036 }
1037
1038 /*
1039  * Purge all sessions which have the 'kill_me' flag set.
1040  * This function has code to prevent it from running more than once every
1041  * few seconds, because running it after every single unbind would waste a lot
1042  * of CPU time and keep the context list locked too much.  To force it to run
1043  * anyway, set "force" to nonzero.
1044  */
1045 void dead_session_purge(int force) {
1046         struct CitContext *ptr, *ptr2;          /* general-purpose utility pointer */
1047         struct CitContext *rem = NULL;  /* list of sessions to be destroyed */
1048
1049         if (force == 0) {
1050                 if ( (time(NULL) - last_purge) < 5 ) {
1051                         return; /* Too soon, go away */
1052                 }
1053         }
1054         time(&last_purge);
1055
1056         if (try_critical_section(S_SESSION_TABLE))
1057                 return;
1058
1059         ptr = ContextList;
1060         while (ptr) {
1061                 ptr2 = ptr;
1062                 ptr = ptr->next;
1063
1064                 if ( (ptr2->state == CON_IDLE) && (ptr2->kill_me) ) {
1065                         /* Remove the session from the active list */
1066                         if (ptr2->prev) {
1067                                 ptr2->prev->next = ptr2->next;
1068                         }
1069                         else {
1070                                 ContextList = ptr2->next;
1071                         }
1072                         if (ptr2->next) {
1073                                 ptr2->next->prev = ptr2->prev;
1074                         }
1075
1076                         --num_sessions;
1077                         /* And put it on our to-be-destroyed list */
1078                         ptr2->next = rem;
1079                         rem = ptr2;
1080                 }
1081         }
1082         end_critical_section(S_SESSION_TABLE);
1083
1084         /* Now that we no longer have the session list locked, we can take
1085          * our time and destroy any sessions on the to-be-killed list, which
1086          * is allocated privately on this thread's stack.
1087          */
1088         while (rem != NULL) {
1089                 CtdlLogPrintf(CTDL_DEBUG, "Purging session %d\n", rem->cs_pid);
1090                 RemoveContext(rem);
1091                 ptr = rem;
1092                 rem = rem->next;
1093                 free(ptr);
1094         }
1095 }
1096
1097
1098
1099
1100
1101 /*
1102  * masterCC is the context we use when not attached to a session.  This
1103  * function initializes it.
1104  */
1105 void InitializeMasterCC(void) {
1106         memset(&masterCC, 0, sizeof(struct CitContext));
1107         masterCC.internal_pgm = 1;
1108         masterCC.cs_pid = 0;
1109 }
1110
1111
1112
1113
1114 /*
1115  * Bind a thread to a context.  (It's inline merely to speed things up.)
1116  */
1117 INLINE void become_session(struct CitContext *which_con) {
1118         citthread_setspecific(MyConKey, (void *)which_con );
1119 }
1120
1121
1122
1123 /*
1124  * This loop just keeps going and going and going...
1125  */
1126 /*
1127  * FIXME:
1128  * This current implimentation of worker_thread creates a bottle neck in several situations
1129  * The first thing to remember is that a single thread can handle more than one connection at a time.
1130  * More threads mean less memory for the system to run in.
1131  * So for efficiency we want every thread to be doing something useful or waiting in the main loop for
1132  * something to happen anywhere.
1133  * This current implimentation requires worker threads to wait in other locations, after it has
1134  * been committed to a single connection which is very wasteful.
1135  * As an extreme case consider this:
1136  * A slow client connects and this slow client sends only one character each second.
1137  * With this current implimentation a single worker thread is dispatched to handle that connection
1138  * until such times as the client timeout expires, an error occurs on the socket or the client
1139  * completes its transmission.
1140  * THIS IS VERY BAD since that thread could have handled a read from many more clients in each one
1141  * second interval between chars.
1142  *
1143  * It is my intention to re-write this code and the associated client_getln, client_read functions
1144  * to allow any thread to read data on behalf of any connection (context).
1145  * To do this I intend to have this main loop read chars into a buffer stored in the context.
1146  * Once the correct criteria for a full buffer is met then we will dispatch a thread to
1147  * process it.
1148  * This worker thread loop also needs to be able to handle binary data.
1149  */
1150
1151 void *worker_thread(void *arg) {
1152         int i;
1153         int highest;
1154         struct CitContext *ptr;
1155         struct CitContext *bind_me = NULL;
1156         fd_set readfds;
1157         int retval = 0;
1158         struct CitContext *con= NULL;   /* Temporary context pointer */
1159         struct ServiceFunctionHook *serviceptr;
1160         int ssock;                      /* Descriptor for client socket */
1161         struct timeval tv;
1162         int force_purge = 0;
1163         int m;
1164
1165
1166         while (!CtdlThreadCheckStop()) {
1167
1168                 /* make doubly sure we're not holding any stale db handles
1169                  * which might cause a deadlock.
1170                  */
1171                 cdb_check_handles();
1172 do_select:      force_purge = 0;
1173                 bind_me = NULL;         /* Which session shall we handle? */
1174
1175                 /* Initialize the fdset. */
1176                 FD_ZERO(&readfds);
1177                 highest = 0;
1178
1179                 begin_critical_section(S_SESSION_TABLE);
1180                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1181                         if (ptr->state == CON_IDLE) {
1182                                 FD_SET(ptr->client_socket, &readfds);
1183                                 if (ptr->client_socket > highest)
1184                                         highest = ptr->client_socket;
1185                         }
1186                         if ((bind_me == NULL) && (ptr->state == CON_READY)) {
1187                                 bind_me = ptr;
1188                                 ptr->state = CON_EXECUTING;
1189                         }
1190                 }
1191                 end_critical_section(S_SESSION_TABLE);
1192
1193                 if (bind_me) {
1194                         goto SKIP_SELECT;
1195                 }
1196
1197                 /* If we got this far, it means that there are no sessions
1198                  * which a previous thread marked for attention, so we go
1199                  * ahead and get ready to select().
1200                  */
1201
1202                 /* First, add the various master sockets to the fdset. */
1203                 for (serviceptr = ServiceHookTable; serviceptr != NULL;
1204                 serviceptr = serviceptr->next ) {
1205                         m = serviceptr->msock;
1206                         FD_SET(m, &readfds);
1207                         if (m > highest) {
1208                                 highest = m;
1209                         }
1210                 }
1211
1212                 if (!CtdlThreadCheckStop()) {
1213                         tv.tv_sec = 1;          /* wake up every second if no input */
1214                         tv.tv_usec = 0;
1215                         retval = CtdlThreadSelect(highest + 1, &readfds, NULL, NULL, &tv);
1216                 }
1217                 else
1218                         return NULL;
1219
1220                 /* Now figure out who made this select() unblock.
1221                  * First, check for an error or exit condition.
1222                  */
1223                 if (retval < 0) {
1224                         if (errno == EBADF) {
1225                                 CtdlLogPrintf(CTDL_NOTICE, "select() failed: (%s)\n",
1226                                         strerror(errno));
1227                                 goto do_select;
1228                         }
1229                         if (errno != EINTR) {
1230                                 CtdlLogPrintf(CTDL_EMERG, "Exiting (%s)\n", strerror(errno));
1231                                 CtdlThreadStopAll();
1232                         } else {
1233                                 CtdlLogPrintf(CTDL_DEBUG, "Interrupted CtdlThreadSelect.\n");
1234                                 if (CtdlThreadCheckStop()) return(NULL);
1235                                 goto do_select;
1236                         }
1237                 }
1238                 else if(retval == 0) {
1239                         if (CtdlThreadCheckStop()) return(NULL);
1240                         goto SKIP_SELECT;
1241                 }
1242                 /* Next, check to see if it's a new client connecting
1243                  * on a master socket.
1244                  */
1245                 else for (serviceptr = ServiceHookTable; serviceptr != NULL;
1246                      serviceptr = serviceptr->next ) {
1247
1248                         if (FD_ISSET(serviceptr->msock, &readfds)) {
1249                                 ssock = accept(serviceptr->msock, NULL, 0);
1250                                 if (ssock >= 0) {
1251                                         CtdlLogPrintf(CTDL_DEBUG,
1252                                                 "New client socket %d\n",
1253                                                 ssock);
1254
1255                                         /* The master socket is non-blocking but the client
1256                                          * sockets need to be blocking, otherwise certain
1257                                          * operations barf on FreeBSD.  Not a fatal error.
1258                                          */
1259                                         if (fcntl(ssock, F_SETFL, 0) < 0) {
1260                                                 CtdlLogPrintf(CTDL_EMERG,
1261                                                         "citserver: Can't set socket to blocking: %s\n",
1262                                                         strerror(errno));
1263                                         }
1264
1265                                         /* New context will be created already
1266                                          * set up in the CON_EXECUTING state.
1267                                          */
1268                                         con = CreateNewContext();
1269
1270                                         /* Assign our new socket number to it. */
1271                                         con->client_socket = ssock;
1272                                         con->h_command_function =
1273                                                 serviceptr->h_command_function;
1274                                         con->h_async_function =
1275                                                 serviceptr->h_async_function;
1276                                         con->ServiceName =
1277                                                 serviceptr->ServiceName;
1278
1279                                         /* Determine whether it's a local socket */
1280                                         if (serviceptr->sockpath != NULL)
1281                                                 con->is_local_socket = 1;
1282
1283                                         /* Set the SO_REUSEADDR socket option */
1284                                         i = 1;
1285                                         setsockopt(ssock, SOL_SOCKET,
1286                                                 SO_REUSEADDR,
1287                                                 &i, sizeof(i));
1288
1289                                         become_session(con);
1290                                         begin_session(con);
1291                                         serviceptr->h_greeting_function();
1292                                         become_session(NULL);
1293                                         con->state = CON_IDLE;
1294                                         goto do_select;
1295                                 }
1296                         }
1297                 }
1298
1299                 /* It must be a client socket.  Find a context that has data
1300                  * waiting on its socket *and* is in the CON_IDLE state.  Any
1301                  * active sockets other than our chosen one are marked as
1302                  * CON_READY so the next thread that comes around can just bind
1303                  * to one without having to select() again.
1304                  */
1305                 begin_critical_section(S_SESSION_TABLE);
1306                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1307                         if ( (FD_ISSET(ptr->client_socket, &readfds))
1308                            && (ptr->state != CON_EXECUTING) ) {
1309                                 ptr->input_waiting = 1;
1310                                 if (!bind_me) {
1311                                         bind_me = ptr;  /* I choose you! */
1312                                         bind_me->state = CON_EXECUTING;
1313                                 }
1314                                 else {
1315                                         ptr->state = CON_READY;
1316                                 }
1317                         }
1318                 }
1319                 end_critical_section(S_SESSION_TABLE);
1320
1321 SKIP_SELECT:
1322                 /* We're bound to a session */
1323                 if (bind_me != NULL) {
1324                         become_session(bind_me);
1325
1326                         /* If the client has sent a command, execute it. */
1327                         if (CC->input_waiting) {
1328                                 CC->h_command_function();
1329                                 CC->input_waiting = 0;
1330                         }
1331
1332                         /* If there are asynchronous messages waiting and the
1333                          * client supports it, do those now */
1334                         if ((CC->is_async) && (CC->async_waiting)
1335                            && (CC->h_async_function != NULL)) {
1336                                 CC->h_async_function();
1337                                 CC->async_waiting = 0;
1338                         }
1339
1340                         force_purge = CC->kill_me;
1341                         become_session(NULL);
1342                         bind_me->state = CON_IDLE;
1343                 }
1344
1345                 dead_session_purge(force_purge);
1346                 do_housekeeping();
1347         }
1348         /* If control reaches this point, the server is shutting down */
1349         return(NULL);
1350 }
1351
1352
1353
1354
1355 /*
1356  * SyslogFacility()
1357  * Translate text facility name to syslog.h defined value.
1358  */
1359 int SyslogFacility(char *name)
1360 {
1361         int i;
1362         struct
1363         {
1364                 int facility;
1365                 char *name;
1366         }   facTbl[] =
1367         {
1368                 {   LOG_KERN,   "kern"          },
1369                 {   LOG_USER,   "user"          },
1370                 {   LOG_MAIL,   "mail"          },
1371                 {   LOG_DAEMON, "daemon"        },
1372                 {   LOG_AUTH,   "auth"          },
1373                 {   LOG_SYSLOG, "syslog"        },
1374                 {   LOG_LPR,    "lpr"           },
1375                 {   LOG_NEWS,   "news"          },
1376                 {   LOG_UUCP,   "uucp"          },
1377                 {   LOG_LOCAL0, "local0"        },
1378                 {   LOG_LOCAL1, "local1"        },
1379                 {   LOG_LOCAL2, "local2"        },
1380                 {   LOG_LOCAL3, "local3"        },
1381                 {   LOG_LOCAL4, "local4"        },
1382                 {   LOG_LOCAL5, "local5"        },
1383                 {   LOG_LOCAL6, "local6"        },
1384                 {   LOG_LOCAL7, "local7"        },
1385                 {   0,            NULL          }
1386         };
1387         for(i = 0; facTbl[i].name != NULL; i++) {
1388                 if(!strcasecmp(name, facTbl[i].name))
1389                         return facTbl[i].facility;
1390         }
1391         enable_syslog = 0;
1392         return LOG_DAEMON;
1393 }
1394
1395
1396 /********** MEM CHEQQER ***********/
1397
1398 #ifdef DEBUG_MEMORY_LEAKS
1399
1400 #undef malloc
1401 #undef realloc
1402 #undef strdup
1403 #undef free
1404
1405 void *tracked_malloc(size_t size, char *file, int line) {
1406         struct igheap *thisheap;
1407         void *block;
1408
1409         block = malloc(size);
1410         if (block == NULL) return(block);
1411
1412         thisheap = malloc(sizeof(struct igheap));
1413         if (thisheap == NULL) {
1414                 free(block);
1415                 return(NULL);
1416         }
1417
1418         thisheap->block = block;
1419         strcpy(thisheap->file, file);
1420         thisheap->line = line;
1421
1422         begin_critical_section(S_DEBUGMEMLEAKS);
1423         thisheap->next = igheap;
1424         igheap = thisheap;
1425         end_critical_section(S_DEBUGMEMLEAKS);
1426
1427         return(block);
1428 }
1429
1430
1431 void *tracked_realloc(void *ptr, size_t size, char *file, int line) {
1432         struct igheap *thisheap;
1433         void *block;
1434
1435         block = realloc(ptr, size);
1436         if (block == NULL) return(block);
1437
1438         thisheap = malloc(sizeof(struct igheap));
1439         if (thisheap == NULL) {
1440                 free(block);
1441                 return(NULL);
1442         }
1443
1444         thisheap->block = block;
1445         strcpy(thisheap->file, file);
1446         thisheap->line = line;
1447
1448         begin_critical_section(S_DEBUGMEMLEAKS);
1449         thisheap->next = igheap;
1450         igheap = thisheap;
1451         end_critical_section(S_DEBUGMEMLEAKS);
1452
1453         return(block);
1454 }
1455
1456
1457
1458 void tracked_free(void *ptr) {
1459         struct igheap *thisheap;
1460         struct igheap *trash;
1461
1462         free(ptr);
1463
1464         if (igheap == NULL) return;
1465         begin_critical_section(S_DEBUGMEMLEAKS);
1466         for (thisheap = igheap; thisheap != NULL; thisheap = thisheap->next) {
1467                 if (thisheap->next != NULL) {
1468                         if (thisheap->next->block == ptr) {
1469                                 trash = thisheap->next;
1470                                 thisheap->next = thisheap->next->next;
1471                                 free(trash);
1472                         }
1473                 }
1474         }
1475         if (igheap->block == ptr) {
1476                 trash = igheap;
1477                 igheap = igheap->next;
1478                 free(trash);
1479         }
1480         end_critical_section(S_DEBUGMEMLEAKS);
1481 }
1482
1483 char *tracked_strdup(const char *s, char *file, int line) {
1484         char *ptr;
1485
1486         if (s == NULL) return(NULL);
1487         ptr = tracked_malloc(strlen(s) + 1, file, line);
1488         if (ptr == NULL) return(NULL);
1489         strncpy(ptr, s, strlen(s));
1490         return(ptr);
1491 }
1492
1493 void dump_heap(void) {
1494         struct igheap *thisheap;
1495
1496         for (thisheap = igheap; thisheap != NULL; thisheap = thisheap->next) {
1497                 CtdlLogPrintf(CTDL_CRIT, "UNFREED: %30s : %d\n",
1498                         thisheap->file, thisheap->line);
1499         }
1500 }
1501
1502 #endif /*  DEBUG_MEMORY_LEAKS */