citadel/sysdep.c

   1 /*
   2  * $Id$
   3  *
   4  * Citadel "system dependent" stuff.
   5  * See copyright.txt 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 #ifdef HAVE_PTHREAD_H
  53 #include <pthread.h>
  54 #endif
  55 #include <libcitadel.h>
  56 #include "citadel.h"
  57 #include "server.h"
  58 #include "sysdep_decls.h"
  59 #include "citserver.h"
  60 #include "support.h"
  61 #include "config.h"
  62 #include "database.h"
  63 #include "housekeeping.h"
  64 #include "modules/crypto/serv_crypto.h" /* Needed for init_ssl, client_write_ssl, client_read_ssl, destruct_ssl */
  65 #include "ecrash.h"
  66
  67 #ifdef HAVE_SYS_SELECT_H
  68 #include <sys/select.h>
  69 #endif
  70
  71 #ifndef HAVE_SNPRINTF
  72 #include "snprintf.h"
  73 #endif
  74
  75 #include "ctdl_module.h"
  76
  77 #ifdef DEBUG_MEMORY_LEAKS
  78 struct igheap {
  79         struct igheap *next;
  80         char file[32];
  81         int line;
  82         void *block;
  83 };
  84
  85 struct igheap *igheap = NULL;
  86 #endif
  87
  88
  89 pthread_mutex_t Critters[MAX_SEMAPHORES];       /* Things needing locking */
  90 pthread_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 static int num_threads = 0;                     /* Current number of threads */
  97 static int num_workers = 0;                     /* Current number of worker threads */
  98 int num_sessions = 0;                           /* Current number of sessions */
  99
 100 int syslog_facility = LOG_DAEMON;
 101 int enable_syslog = 0;
 102
 103
 104 /*
 105  * Create an interface to lprintf that follows the coding convention.
 106  * This is here until such time as we have replaced all calls to lprintf with CtdlLogPrintf
 107  */
 108
 109 void CtdlLogPrintf(enum LogLevel loglevel, const char *format, ...)
 110 {
 111         va_list arg_ptr;
 112         va_start(arg_ptr, format);
 113         vlprintf(loglevel, format, arg_ptr);
 114         va_end(arg_ptr);
 115 }
 116
 117
 118 /*
 119  * lprintf()  ...   Write logging information
 120  */
 121 void lprintf(enum LogLevel loglevel, const char *format, ...) {
 122         va_list arg_ptr;
 123         va_start(arg_ptr, format);
 124         vlprintf(loglevel, format, arg_ptr);
 125         va_end(arg_ptr);
 126 }
 127
 128 void vlprintf(enum LogLevel loglevel, const char *format, va_list arg_ptr)
 129 {
 130         char buf[SIZ], buf2[SIZ];
 131
 132         if (enable_syslog) {
 133                 vsyslog((syslog_facility | loglevel), format, arg_ptr);
 134         }
 135
 136         /* stderr output code */
 137         if (enable_syslog || running_as_daemon) return;
 138
 139         /* if we run in forground and syslog is disabled, log to terminal */
 140         if (loglevel <= verbosity) {
 141                 struct timeval tv;
 142                 struct tm tim;
 143                 time_t unixtime;
 144
 145                 gettimeofday(&tv, NULL);
 146                 /* Promote to time_t; types differ on some OSes (like darwin) */
 147                 unixtime = tv.tv_sec;
 148                 localtime_r(&unixtime, &tim);
 149                 if (CC->cs_pid != 0) {
 150                         sprintf(buf,
 151                                 "%04d/%02d/%02d %2d:%02d:%02d.%06ld [%3d] ",
 152                                 tim.tm_year + 1900, tim.tm_mon + 1,
 153                                 tim.tm_mday, tim.tm_hour, tim.tm_min,
 154                                 tim.tm_sec, (long)tv.tv_usec,
 155                                 CC->cs_pid);
 156                 } else {
 157                         sprintf(buf,
 158                                 "%04d/%02d/%02d %2d:%02d:%02d.%06ld ",
 159                                 tim.tm_year + 1900, tim.tm_mon + 1,
 160                                 tim.tm_mday, tim.tm_hour, tim.tm_min,
 161                                 tim.tm_sec, (long)tv.tv_usec);
 162                 }
 163                 vsprintf(buf2, format, arg_ptr);
 164
 165                 fprintf(stderr, "%s%s", buf, buf2);
 166                 fflush(stderr);
 167         }
 168 }
 169
 170
 171
 172 /*
 173  * Signal handler to shut down the server.
 174  */
 175
 176 volatile int exit_signal = 0;
 177 volatile int shutdown_and_halt = 0;
 178 volatile int restart_server = 0;
 179 volatile int running_as_daemon = 0;
 180
 181 static RETSIGTYPE signal_cleanup(int signum) {
 182         CtdlLogPrintf(CTDL_DEBUG, "Caught signal %d; shutting down.\n", signum);
 183         CtdlThreadStopAll();
 184         exit_signal = signum;
 185 }
 186
 187
 188
 189
 190 void InitialiseSemaphores(void)
 191 {
 192         int i;
 193
 194         /* Set up a bunch of semaphores to be used for critical sections */
 195         for (i=0; i<MAX_SEMAPHORES; ++i) {
 196                 pthread_mutex_init(&Critters[i], NULL);
 197         }
 198 }
 199
 200
 201
 202 /*
 203  * Some initialization stuff...
 204  */
 205 void init_sysdep(void) {
 206         sigset_t set;
 207
 208         /* Avoid vulnerabilities related to FD_SETSIZE if we can. */
 209 #ifdef FD_SETSIZE
 210 #ifdef RLIMIT_NOFILE
 211         struct rlimit rl;
 212         getrlimit(RLIMIT_NOFILE, &rl);
 213         rl.rlim_cur = FD_SETSIZE;
 214         rl.rlim_max = FD_SETSIZE;
 215         setrlimit(RLIMIT_NOFILE, &rl);
 216 #endif
 217 #endif
 218
 219         /* If we've got OpenSSL, we're going to use it. */
 220 #ifdef HAVE_OPENSSL
 221         init_ssl();
 222 #endif
 223
 224         /*
 225          * Set up a place to put thread-specific data.
 226          * We only need a single pointer per thread - it points to the
 227          * CitContext structure (in the ContextList linked list) of the
 228          * session to which the calling thread is currently bound.
 229          */
 230         if (pthread_key_create(&MyConKey, NULL) != 0) {
 231                 CtdlLogPrintf(CTDL_CRIT, "Can't create TSD key: %s\n",
 232                         strerror(errno));
 233         }
 234
 235         /*
 236          * The action for unexpected signals and exceptions should be to
 237          * call signal_cleanup() to gracefully shut down the server.
 238          */
 239         sigemptyset(&set);
 240         sigaddset(&set, SIGINT);
 241         sigaddset(&set, SIGQUIT);
 242         sigaddset(&set, SIGHUP);
 243         sigaddset(&set, SIGTERM);
 244         // sigaddset(&set, SIGSEGV);    commented out because
 245         // sigaddset(&set, SIGILL);     we want core dumps
 246         // sigaddset(&set, SIGBUS);
 247         sigprocmask(SIG_UNBLOCK, &set, NULL);
 248
 249         signal(SIGINT, signal_cleanup);
 250         signal(SIGQUIT, signal_cleanup);
 251         signal(SIGHUP, signal_cleanup);
 252         signal(SIGTERM, signal_cleanup);
 253         // signal(SIGSEGV, signal_cleanup);     commented out because
 254         // signal(SIGILL, signal_cleanup);      we want core dumps
 255         // signal(SIGBUS, signal_cleanup);
 256
 257         /*
 258          * Do not shut down the server on broken pipe signals, otherwise the
 259          * whole Citadel service would come down whenever a single client
 260          * socket breaks.
 261          */
 262         //signal(SIGPIPE, SIG_IGN);
 263         signal(SIGPIPE, signal_cleanup);
 264 }
 265
 266
 267 /*
 268  * Obtain a semaphore lock to begin a critical section.
 269  */
 270 void begin_critical_section(int which_one)
 271 {
 272         /* CtdlLogPrintf(CTDL_DEBUG, "begin_critical_section(%d)\n", which_one); */
 273
 274         /* For all types of critical sections except those listed here,
 275          * ensure nobody ever tries to do a critical section within a
 276          * transaction; this could lead to deadlock.
 277          */
 278         if (    (which_one != S_FLOORCACHE)
 279 #ifdef DEBUG_MEMORY_LEAKS
 280                 && (which_one != S_DEBUGMEMLEAKS)
 281 #endif
 282                 && (which_one != S_RPLIST)
 283         ) {
 284                 cdb_check_handles();
 285         }
 286         pthread_mutex_lock(&Critters[which_one]);
 287 }
 288
 289 /*
 290  * Release a semaphore lock to end a critical section.
 291  */
 292 void end_critical_section(int which_one)
 293 {
 294         pthread_mutex_unlock(&Critters[which_one]);
 295 }
 296
 297
 298
 299 /*
 300  * This is a generic function to set up a master socket for listening on
 301  * a TCP port.  The server shuts down if the bind fails.
 302  *
 303  */
 304 int ig_tcp_server(char *ip_addr, int port_number, int queue_len, char **errormessage)
 305 {
 306         struct sockaddr_in sin;
 307         int s, i;
 308         int actual_queue_len;
 309
 310         actual_queue_len = queue_len;
 311         if (actual_queue_len < 5) actual_queue_len = 5;
 312
 313         memset(&sin, 0, sizeof(sin));
 314         sin.sin_family = AF_INET;
 315         sin.sin_port = htons((u_short)port_number);
 316         if (ip_addr == NULL) {
 317                 sin.sin_addr.s_addr = INADDR_ANY;
 318         }
 319         else {
 320                 sin.sin_addr.s_addr = inet_addr(ip_addr);
 321         }
 322
 323         if (sin.sin_addr.s_addr == !INADDR_ANY) {
 324                 sin.sin_addr.s_addr = INADDR_ANY;
 325         }
 326
 327         s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 328
 329         if (s < 0) {
 330                 *errormessage = (char*) malloc(SIZ + 1);
 331                 snprintf(*errormessage, SIZ,
 332                                  "citserver: Can't create a socket: %s",
 333                                  strerror(errno));
 334                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 335                 return(-1);
 336         }
 337
 338         i = 1;
 339         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 340
 341         if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
 342                 *errormessage = (char*) malloc(SIZ + 1);
 343                 snprintf(*errormessage, SIZ,
 344                                  "citserver: Can't bind: %s",
 345                                  strerror(errno));
 346                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 347                 close(s);
 348                 return(-1);
 349         }
 350
 351         /* set to nonblock - we need this for some obscure situations */
 352         if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
 353                 *errormessage = (char*) malloc(SIZ + 1);
 354                 snprintf(*errormessage, SIZ,
 355                                  "citserver: Can't set socket to non-blocking: %s",
 356                                  strerror(errno));
 357                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 358                 close(s);
 359                 return(-1);
 360         }
 361
 362         if (listen(s, actual_queue_len) < 0) {
 363                 *errormessage = (char*) malloc(SIZ + 1);
 364                 snprintf(*errormessage, SIZ,
 365                                  "citserver: Can't listen: %s",
 366                                  strerror(errno));
 367                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 368                 close(s);
 369                 return(-1);
 370         }
 371
 372         return(s);
 373 }
 374
 375
 376
 377 /*
 378  * Create a Unix domain socket and listen on it
 379  */
 380 int ig_uds_server(char *sockpath, int queue_len, char **errormessage)
 381 {
 382         struct sockaddr_un addr;
 383         int s;
 384         int i;
 385         int actual_queue_len;
 386
 387         actual_queue_len = queue_len;
 388         if (actual_queue_len < 5) actual_queue_len = 5;
 389
 390         i = unlink(sockpath);
 391         if (i != 0) if (errno != ENOENT) {
 392                 *errormessage = (char*) malloc(SIZ + 1);
 393                 snprintf(*errormessage, SIZ, "citserver: can't unlink %s: %s",
 394                         sockpath, strerror(errno));
 395                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 396                 return(-1);
 397         }
 398
 399         memset(&addr, 0, sizeof(addr));
 400         addr.sun_family = AF_UNIX;
 401         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 402
 403         s = socket(AF_UNIX, SOCK_STREAM, 0);
 404         if (s < 0) {
 405                 *errormessage = (char*) malloc(SIZ + 1);
 406                 snprintf(*errormessage, SIZ,
 407                          "citserver: Can't create a socket: %s",
 408                          strerror(errno));
 409                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 410                 return(-1);
 411         }
 412
 413         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 414                 *errormessage = (char*) malloc(SIZ + 1);
 415                 snprintf(*errormessage, SIZ,
 416                          "citserver: Can't bind: %s",
 417                          strerror(errno));
 418                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 419                 return(-1);
 420         }
 421
 422         /* set to nonblock - we need this for some obscure situations */
 423         if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
 424                 *errormessage = (char*) malloc(SIZ + 1);
 425                 snprintf(*errormessage, SIZ,
 426                          "citserver: Can't set socket to non-blocking: %s",
 427                          strerror(errno));
 428                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 429                 close(s);
 430                 return(-1);
 431         }
 432
 433         if (listen(s, actual_queue_len) < 0) {
 434                 *errormessage = (char*) malloc(SIZ + 1);
 435                 snprintf(*errormessage, SIZ,
 436                          "citserver: Can't listen: %s",
 437                          strerror(errno));
 438                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 439                 return(-1);
 440         }
 441
 442         chmod(sockpath, S_ISGID|S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
 443         return(s);
 444 }
 445
 446
 447
 448 /*
 449  * Return a pointer to the CitContext structure bound to the thread which
 450  * called this function.  If there's no such binding (for example, if it's
 451  * called by the housekeeper thread) then a generic 'master' CC is returned.
 452  *
 453  * This function is used *VERY* frequently and must be kept small.
 454  */
 455 struct CitContext *MyContext(void) {
 456
 457         register struct CitContext *c;
 458
 459         return ((c = (struct CitContext *) pthread_getspecific(MyConKey),
 460                 c == NULL) ? &masterCC : c
 461         );
 462 }
 463
 464
 465 /*
 466  * Initialize a new context and place it in the list.  The session number
 467  * used to be the PID (which is why it's called cs_pid), but that was when we
 468  * had one process per session.  Now we just assign them sequentially, starting
 469  * at 1 (don't change it to 0 because masterCC uses 0).
 470  */
 471 struct CitContext *CreateNewContext(void) {
 472         struct CitContext *me;
 473         static int next_pid = 0;
 474
 475         me = (struct CitContext *) malloc(sizeof(struct CitContext));
 476         if (me == NULL) {
 477                 CtdlLogPrintf(CTDL_ALERT, "citserver: can't allocate memory!!\n");
 478                 return NULL;
 479         }
 480         memset(me, 0, sizeof(struct CitContext));
 481
 482         /* The new context will be created already in the CON_EXECUTING state
 483          * in order to prevent another thread from grabbing it while it's
 484          * being set up.
 485          */
 486         me->state = CON_EXECUTING;
 487
 488         /*
 489          * Generate a unique session number and insert this context into
 490          * the list.
 491          */
 492         begin_critical_section(S_SESSION_TABLE);
 493         me->cs_pid = ++next_pid;
 494         me->prev = NULL;
 495         me->next = ContextList;
 496         ContextList = me;
 497         if (me->next != NULL) {
 498                 me->next->prev = me;
 499         }
 500         ++num_sessions;
 501         end_critical_section(S_SESSION_TABLE);
 502         return(me);
 503 }
 504
 505
 506 /*
 507  * The following functions implement output buffering. If the kernel supplies
 508  * native TCP buffering (Linux & *BSD), use that; otherwise, emulate it with
 509  * user-space buffering.
 510  */
 511 #ifndef HAVE_DARWIN
 512 #ifdef TCP_CORK
 513 #       define HAVE_TCP_BUFFERING
 514 #else
 515 #       ifdef TCP_NOPUSH
 516 #               define HAVE_TCP_BUFFERING
 517 #               define TCP_CORK TCP_NOPUSH
 518 #       endif
 519 #endif /* TCP_CORK */
 520 #endif /* HAVE_DARWIN */
 521
 522 #ifdef HAVE_TCP_BUFFERING
 523 static unsigned on = 1, off = 0;
 524 void buffer_output(void) {
 525         struct CitContext *ctx = MyContext();
 526         setsockopt(ctx->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 527         ctx->buffering = 1;
 528 }
 529
 530 void unbuffer_output(void) {
 531         struct CitContext *ctx = MyContext();
 532         setsockopt(ctx->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 533         ctx->buffering = 0;
 534 }
 535
 536 void flush_output(void) {
 537         struct CitContext *ctx = MyContext();
 538         setsockopt(ctx->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 539         setsockopt(ctx->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 540 }
 541 #else
 542 #ifdef HAVE_DARWIN
 543 /* Stub functions for Darwin/OS X where TCP buffering isn't liked at all */
 544 void buffer_output(void) {
 545         CC->buffering = 0;
 546 }
 547 void unbuffer_output(void) {
 548         CC->buffering = 0;
 549 }
 550 void flush_output(void) {
 551 }
 552 #else
 553 void buffer_output(void) {
 554         if (CC->buffering == 0) {
 555                 CC->buffering = 1;
 556                 CC->buffer_len = 0;
 557                 CC->output_buffer = malloc(SIZ);
 558         }
 559 }
 560
 561 void flush_output(void) {
 562         if (CC->buffering == 1) {
 563                 client_write(CC->output_buffer, CC->buffer_len);
 564                 CC->buffer_len = 0;
 565         }
 566 }
 567
 568 void unbuffer_output(void) {
 569         if (CC->buffering == 1) {
 570                 CC->buffering = 0;
 571                 /* We don't call flush_output because we can't. */
 572                 client_write(CC->output_buffer, CC->buffer_len);
 573                 CC->buffer_len = 0;
 574                 free(CC->output_buffer);
 575                 CC->output_buffer = NULL;
 576         }
 577 }
 578 #endif /* HAVE_DARWIN */
 579 #endif /* HAVE_TCP_BUFFERING */
 580
 581
 582
 583 /*
 584  * client_write()   ...    Send binary data to the client.
 585  */
 586 void client_write(char *buf, int nbytes)
 587 {
 588         int bytes_written = 0;
 589         int retval;
 590 #ifndef HAVE_TCP_BUFFERING
 591         int old_buffer_len = 0;
 592 #endif
 593         t_context *Ctx;
 594
 595         Ctx = CC;
 596         if (Ctx->redirect_buffer != NULL) {
 597                 if ((Ctx->redirect_len + nbytes + 2) >= Ctx->redirect_alloc) {
 598                         Ctx->redirect_alloc = (Ctx->redirect_alloc * 2) + nbytes;
 599                         Ctx->redirect_buffer = realloc(Ctx->redirect_buffer,
 600                                                 Ctx->redirect_alloc);
 601                 }
 602                 memcpy(&Ctx->redirect_buffer[Ctx->redirect_len], buf, nbytes);
 603                 Ctx->redirect_len += nbytes;
 604                 Ctx->redirect_buffer[Ctx->redirect_len] = 0;
 605                 return;
 606         }
 607
 608 #ifndef HAVE_TCP_BUFFERING
 609         /* If we're buffering for later, do that now. */
 610         if (Ctx->buffering) {
 611                 old_buffer_len = Ctx->buffer_len;
 612                 Ctx->buffer_len += nbytes;
 613                 Ctx->output_buffer = realloc(Ctx->output_buffer, Ctx->buffer_len);
 614                 memcpy(&Ctx->output_buffer[old_buffer_len], buf, nbytes);
 615                 return;
 616         }
 617 #endif
 618
 619         /* Ok, at this point we're not buffering.  Go ahead and write. */
 620
 621 #ifdef HAVE_OPENSSL
 622         if (Ctx->redirect_ssl) {
 623                 client_write_ssl(buf, nbytes);
 624                 return;
 625         }
 626 #endif
 627
 628         while (bytes_written < nbytes) {
 629                 retval = write(Ctx->client_socket, &buf[bytes_written],
 630                         nbytes - bytes_written);
 631                 if (retval < 1) {
 632                         CtdlLogPrintf(CTDL_ERR,
 633                                 "client_write(%d bytes) failed: %s (%d)\n",
 634                                 nbytes - bytes_written,
 635                                 strerror(errno), errno);
 636                         cit_backtrace();
 637                         // CtdlLogPrintf(CTDL_DEBUG, "Tried to send: %s",  &buf[bytes_written]);
 638                         Ctx->kill_me = 1;
 639                         return;
 640                 }
 641                 bytes_written = bytes_written + retval;
 642         }
 643 }
 644
 645
 646 /*
 647  * cprintf()  ...   Send formatted printable data to the client.   It is
 648  *                implemented in terms of client_write() but remains in
 649  *                sysdep.c in case we port to somewhere without va_args...
 650  */
 651 void cprintf(const char *format, ...) {
 652         va_list arg_ptr;
 653         char buf[1024];
 654
 655         va_start(arg_ptr, format);
 656         if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
 657                 buf[sizeof buf - 2] = '\n';
 658         client_write(buf, strlen(buf));
 659         va_end(arg_ptr);
 660 }
 661
 662
 663 /*
 664  * Read data from the client socket.
 665  * Return values are:
 666  *      1       Requested number of bytes has been read.
 667  *      0       Request timed out.
 668  *      -1      The socket is broken.
 669  * If the socket breaks, the session will be terminated.
 670  */
 671 int client_read_to(char *buf, int bytes, int timeout)
 672 {
 673         int len,rlen;
 674         fd_set rfds;
 675         int fd;
 676         struct timeval tv;
 677         int retval;
 678
 679 #ifdef HAVE_OPENSSL
 680         if (CC->redirect_ssl) {
 681                 return (client_read_ssl(buf, bytes, timeout));
 682         }
 683 #endif
 684         len = 0;
 685         fd = CC->client_socket;
 686         while(len<bytes) {
 687                 FD_ZERO(&rfds);
 688                 FD_SET(fd, &rfds);
 689                 tv.tv_sec = timeout;
 690                 tv.tv_usec = 0;
 691
 692                 retval = select( (fd)+1,
 693                                  &rfds, NULL, NULL, &tv);
 694
 695                 if (FD_ISSET(fd, &rfds) == 0) {
 696                         return(0);
 697                 }
 698
 699                 rlen = read(fd, &buf[len], bytes-len);
 700                 if (rlen<1) {
 701                         /* The socket has been disconnected! */
 702                         CC->kill_me = 1;
 703                         return(-1);
 704                 }
 705                 len = len + rlen;
 706         }
 707         return(1);
 708 }
 709
 710 /*
 711  * Read data from the client socket with default timeout.
 712  * (This is implemented in terms of client_read_to() and could be
 713  * justifiably moved out of sysdep.c)
 714  */
 715 INLINE int client_read(char *buf, int bytes)
 716 {
 717         return(client_read_to(buf, bytes, config.c_sleeping));
 718 }
 719
 720
 721 /*
 722  * client_getln()   ...   Get a LF-terminated line of text from the client.
 723  * (This is implemented in terms of client_read() and could be
 724  * justifiably moved out of sysdep.c)
 725  */
 726 int client_getln(char *buf, int bufsize)
 727 {
 728         int i, retval;
 729
 730         /* Read one character at a time.
 731          */
 732         for (i = 0;;i++) {
 733                 retval = client_read(&buf[i], 1);
 734                 if (retval != 1 || buf[i] == '\n' || i == (bufsize-1))
 735                         break;
 736         }
 737
 738         /* If we got a long line, discard characters until the newline.
 739          */
 740         if (i == (bufsize-1))
 741                 while (buf[i] != '\n' && retval == 1)
 742                         retval = client_read(&buf[i], 1);
 743
 744         /* Strip the trailing LF, and the trailing CR if present.
 745          */
 746         buf[i] = 0;
 747         while ( (i > 0)
 748                 && ( (buf[i - 1]==13)
 749                      || ( buf[i - 1]==10)) ) {
 750                 i--;
 751                 buf[i] = 0;
 752         }
 753         if (retval < 0) safestrncpy(&buf[i], "000", bufsize - i);
 754         return(retval);
 755 }
 756
 757
 758 /*
 759  * Cleanup any contexts that are left lying around
 760  */
 761 void context_cleanup(void)
 762 {
 763         struct CitContext *ptr = NULL;
 764         struct CitContext *rem = NULL;
 765
 766         /*
 767          * Clean up the contexts.
 768          * There are no threads so no critical_section stuff is needed.
 769          */
 770         ptr = ContextList;
 771         while (ptr != NULL){
 772                 /* Remove the session from the active list */
 773                 rem = ptr->next;
 774                 --num_sessions;
 775
 776                 lprintf(CTDL_DEBUG, "Purging session %d\n", ptr->cs_pid);
 777                 RemoveContext(ptr);
 778                 free (ptr);
 779                 ptr = rem;
 780         }
 781
 782 }
 783
 784
 785 /*
 786  * The system-dependent part of master_cleanup() - close the master socket.
 787  */
 788 void sysdep_master_cleanup(void) {
 789         struct ServiceFunctionHook *serviceptr;
 790
 791         /*
 792          * close all protocol master sockets
 793          */
 794         for (serviceptr = ServiceHookTable; serviceptr != NULL;
 795             serviceptr = serviceptr->next ) {
 796
 797                 if (serviceptr->tcp_port > 0)
 798                         CtdlLogPrintf(CTDL_INFO, "Closing listener on port %d\n",
 799                                 serviceptr->tcp_port);
 800
 801                 if (serviceptr->sockpath != NULL)
 802                         CtdlLogPrintf(CTDL_INFO, "Closing listener on '%s'\n",
 803                                 serviceptr->sockpath);
 804
 805                 close(serviceptr->msock);
 806
 807                 /* If it's a Unix domain socket, remove the file. */
 808                 if (serviceptr->sockpath != NULL) {
 809                         unlink(serviceptr->sockpath);
 810                 }
 811         }
 812
 813         context_cleanup();
 814
 815 #ifdef HAVE_OPENSSL
 816         destruct_ssl();
 817 #endif
 818         CtdlDestroyProtoHooks();
 819         CtdlDestroyDeleteHooks();
 820         CtdlDestroyXmsgHooks();
 821         CtdlDestroyNetprocHooks();
 822         CtdlDestroyUserHooks();
 823         CtdlDestroyMessageHook();
 824         CtdlDestroyCleanupHooks();
 825         CtdlDestroyFixedOutputHooks();
 826         CtdlDestroySessionHooks();
 827         CtdlDestroyServiceHook();
 828         #ifdef HAVE_BACKTRACE
 829         eCrash_Uninit();
 830         #endif
 831 }
 832
 833
 834
 835 /*
 836  * Terminate another session.
 837  * (This could justifiably be moved out of sysdep.c because it
 838  * no longer does anything that is system-dependent.)
 839  */
 840 void kill_session(int session_to_kill) {
 841         struct CitContext *ptr;
 842
 843         begin_critical_section(S_SESSION_TABLE);
 844         for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
 845                 if (ptr->cs_pid == session_to_kill) {
 846                         ptr->kill_me = 1;
 847                 }
 848         }
 849         end_critical_section(S_SESSION_TABLE);
 850 }
 851
 852 pid_t current_child;
 853 void graceful_shutdown(int signum) {
 854         kill(current_child, signum);
 855         unlink(file_pid_file);
 856         exit(0);
 857 }
 858
 859
 860 /*
 861  * Start running as a daemon.
 862  */
 863 void start_daemon(int unused) {
 864         int status = 0;
 865         pid_t child = 0;
 866         FILE *fp;
 867         int do_restart = 0;
 868
 869         current_child = 0;
 870
 871         /* Close stdin/stdout/stderr and replace them with /dev/null.
 872          * We don't just call close() because we don't want these fd's
 873          * to be reused for other files.
 874          */
 875         chdir(ctdl_run_dir);
 876
 877         child = fork();
 878         if (child != 0) {
 879                 exit(0);
 880         }
 881
 882         signal(SIGHUP, SIG_IGN);
 883         signal(SIGINT, SIG_IGN);
 884         signal(SIGQUIT, SIG_IGN);
 885
 886         setsid();
 887         umask(0);
 888         freopen("/dev/null", "r", stdin);
 889         freopen("/dev/null", "w", stdout);
 890         freopen("/dev/null", "w", stderr);
 891
 892         do {
 893                 current_child = fork();
 894
 895                 signal(SIGTERM, graceful_shutdown);
 896
 897                 if (current_child < 0) {
 898                         perror("fork");
 899                         exit(errno);
 900                 }
 901
 902                 else if (current_child == 0) {
 903                         return; /* continue starting citadel. */
 904                 }
 905
 906                 else {
 907                         fp = fopen(file_pid_file, "w");
 908                         if (fp != NULL) {
 909                 /*
 910                  * NB.. The pid file contains the pid of the actual server.
 911                  * This is not the pid of the watcher process
 912                  */
 913                                 fprintf(fp, ""F_PID_T"\n", current_child);
 914                                 fclose(fp);
 915                         }
 916                         waitpid(current_child, &status, 0);
 917                 }
 918
 919                 do_restart = 0;
 920
 921                 /* Did the main process exit with an actual exit code? */
 922                 if (WIFEXITED(status)) {
 923
 924                         /* Exit code 0 means the watcher should exit */
 925                         if (WEXITSTATUS(status) == 0) {
 926                                 do_restart = 0;
 927                         }
 928
 929                         /* Exit code 101-109 means the watcher should exit */
 930                         else if ( (WEXITSTATUS(status) >= 101) && (WEXITSTATUS(status) <= 109) ) {
 931                                 do_restart = 0;
 932                         }
 933
 934                         /* Any other exit code means we should restart. */
 935                         else {
 936                                 do_restart = 1;
 937                         }
 938                 }
 939
 940                 /* Any other type of termination (signals, etc.) should also restart. */
 941                 else {
 942                         do_restart = 1;
 943                 }
 944
 945         } while (do_restart);
 946
 947         unlink(file_pid_file);
 948         exit(WEXITSTATUS(status));
 949 }
 950
 951
 952
 953 /*
 954  * Generic routine to convert a login name to a full name (gecos)
 955  * Returns nonzero if a conversion took place
 956  */
 957 int convert_login(char NameToConvert[]) {
 958         struct passwd *pw;
 959         int a;
 960
 961         pw = getpwnam(NameToConvert);
 962         if (pw == NULL) {
 963                 return(0);
 964         }
 965         else {
 966                 strcpy(NameToConvert, pw->pw_gecos);
 967                 for (a=0; a<strlen(NameToConvert); ++a) {
 968                         if (NameToConvert[a] == ',') NameToConvert[a] = 0;
 969                 }
 970                 return(1);
 971         }
 972 }
 973
 974
 975
 976 /*
 977  * New thread interface.
 978  * To create a thread you must call one of the create thread functions.
 979  * You must pass it the address of (a pointer to a CtdlThreadNode initialised to NULL) like this
 980  * struct CtdlThreadNode *node = NULL;
 981  * pass in &node
 982  * If the thread is created *node will point to the thread control structure for the created thread.
 983  * If the thread creation fails *node remains NULL
 984  * Do not free the memory pointed to by *node, it doesn't belong to you.
 985  * If your thread function returns it will be started again without creating a new thread.
 986  * If your thread function wants to exit it should call CtdlThreadExit(ret_code);
 987  * This new interface duplicates much of the eCrash stuff. We should go for closer integration since that would
 988  * remove the need for the calls to eCrashRegisterThread and friends
 989  */
 990
 991
 992 struct CtdlThreadNode *CtdlThreadList = NULL;
 993
 994 /*
 995  * Condition variable and Mutex for thread garbage collection
 996  */
 997 static pthread_mutex_t thread_gc_mutex = PTHREAD_MUTEX_INITIALIZER;
 998 static pthread_cond_t thread_gc_cond = PTHREAD_COND_INITIALIZER;
 999 static pthread_t GC_thread;
1000 static char *CtdlThreadStates[CTDL_THREAD_LAST_STATE];
1001 /*
1002  * Pinched the following bits regarding signals from Kannel.org
1003  */
1004
1005 /*
1006  * Change this thread's signal mask to block user-visible signals
1007  * (HUP, TERM, QUIT, INT), and store the old signal mask in
1008  * *old_set_storage.
1009  * Return 0 for success, or -1 if an error occurred.
1010  */
1011
1012  /*
1013   * This does not work in Darwin alias MacOS X alias Mach kernel,
1014   * however. So we define a dummy function doing nothing.
1015   */
1016 #if defined(DARWIN_OLD)
1017     static int pthread_sigmask();
1018 #endif
1019
1020 static int ctdl_thread_internal_block_signals(sigset_t *old_set_storage)
1021 {
1022     int ret;
1023     sigset_t block_signals;
1024
1025     ret = sigemptyset(&block_signals);
1026     if (ret != 0) {
1027         CtdlLogPrintf(CTDL_EMERG, "Thread system PANIC. Couldn't initialize signal set\n");
1028             return -1;
1029     }
1030     ret = sigaddset(&block_signals, SIGHUP);
1031     ret |= sigaddset(&block_signals, SIGTERM);
1032     ret |= sigaddset(&block_signals, SIGQUIT);
1033     ret |= sigaddset(&block_signals, SIGINT);
1034     if (ret != 0) {
1035         CtdlLogPrintf(CTDL_EMERG, "Thread system PANIC. Couldn't add signal to signal set.\n");
1036             return -1;
1037     }
1038     ret = pthread_sigmask(SIG_BLOCK, &block_signals, old_set_storage);
1039     if (ret != 0) {
1040         CtdlLogPrintf(CTDL_EMERG, "Thread system PANIC. Couldn't disable signals for thread creation\n");
1041         return -1;
1042     }
1043     return 0;
1044 }
1045
1046 static void ctdl_thread_internal_restore_signals(sigset_t *old_set)
1047 {
1048     int ret;
1049
1050     ret = pthread_sigmask(SIG_SETMASK, old_set, NULL);
1051     if (ret != 0) {
1052         CtdlLogPrintf(CTDL_EMERG, "Thread system PANIC. Couldn't restore signal set.\n");
1053     }
1054 }
1055
1056
1057 void ctdl_thread_internal_init(void)
1058 {
1059         GC_thread = pthread_self();
1060         CtdlThreadStates[CTDL_THREAD_INVALID] = strdup ("Invalid Thread");
1061         CtdlThreadStates[CTDL_THREAD_VALID] = strdup("Valid Thread");
1062         CtdlThreadStates[CTDL_THREAD_CREATE] = strdup("Thread being Created");
1063         CtdlThreadStates[CTDL_THREAD_CANCELLED] = strdup("Thread Cancelled");
1064         CtdlThreadStates[CTDL_THREAD_EXITED] = strdup("Thread Exited");
1065         CtdlThreadStates[CTDL_THREAD_STOPPING] = strdup("Thread Stopping");
1066         CtdlThreadStates[CTDL_THREAD_STOP_REQ] = strdup("Thread Stop Requested");
1067         CtdlThreadStates[CTDL_THREAD_SLEEPING] = strdup("Thread Sleeping");
1068         CtdlThreadStates[CTDL_THREAD_RUNNING] = strdup("Thread Running");
1069 }
1070
1071 /*
1072  * A function to tell all threads to exit
1073  */
1074 void CtdlThreadStopAll(void)
1075 {
1076         struct CtdlThreadNode *this_thread;
1077
1078         begin_critical_section(S_THREAD_LIST);
1079         this_thread = CtdlThreadList;
1080         while(this_thread)
1081         {
1082                 pthread_mutex_lock(&this_thread->ThreadMutex); /* To prevent race condition of a sleeping thread */
1083                 if (this_thread->state > CTDL_THREAD_STOP_REQ)
1084                         this_thread->state = CTDL_THREAD_STOP_REQ;
1085                 pthread_mutex_unlock(&this_thread->ThreadMutex);
1086                 pthread_cond_signal(&this_thread->ThreadCond);
1087                 CtdlLogPrintf(CTDL_DEBUG, "Thread system stopping thread \"%s\" (%ld).\n", this_thread->name, this_thread->tid);
1088                 this_thread = this_thread->next;
1089         }
1090         end_critical_section(S_THREAD_LIST);
1091 }
1092
1093
1094 /*
1095  * A function to signal that we need to do garbage collection on the thread list
1096  */
1097 void CtdlThreadGC(void)
1098 {
1099         pthread_cond_signal(&thread_gc_cond);
1100 }
1101
1102
1103 /*
1104  * A function to return the number of threads running in the system
1105  */
1106 int CtdlThreadGetCount(void)
1107 {
1108         return num_threads;
1109 }
1110
1111 /*
1112  * A function to find the thread structure for this thread
1113  */
1114 struct CtdlThreadNode *CtdlThreadSelf(void)
1115 {
1116         pthread_t self_tid;
1117         struct CtdlThreadNode *this_thread;
1118
1119         self_tid = pthread_self();
1120
1121         begin_critical_section(S_THREAD_LIST);
1122         this_thread = CtdlThreadList;
1123         while(this_thread)
1124         {
1125                 if (pthread_equal(self_tid, this_thread->tid))
1126                 {
1127                         end_critical_section(S_THREAD_LIST);
1128                         return this_thread;
1129                 }
1130                 this_thread = this_thread->next;
1131         }
1132         end_critical_section(S_THREAD_LIST);
1133         return NULL;
1134 }
1135
1136
1137
1138
1139 /*
1140  * A function to rename a thread
1141  * Returns a char * and the caller owns the memory and should free it
1142  */
1143 char *CtdlThreadName(struct CtdlThreadNode *thread, char *name)
1144 {
1145         struct CtdlThreadNode *this_thread;
1146         char *old_name;
1147
1148         if (!thread)
1149                 this_thread = CtdlThreadSelf();
1150         else
1151                 this_thread = thread;
1152         if (!this_thread)
1153         {
1154                 CtdlLogPrintf(CTDL_WARNING, "Thread system WARNING. Attempt to CtdlThreadRename() a non thread.\n");
1155                 return NULL;
1156         }
1157         begin_critical_section(S_THREAD_LIST);
1158         if (name)
1159         {
1160                 old_name = this_thread->name;
1161                 this_thread->name = strdup (name);
1162                 free(old_name);
1163         }
1164         old_name = strdup(this_thread->name);
1165         end_critical_section (S_THREAD_LIST);
1166         return (old_name);
1167 }
1168
1169
1170 /*
1171  * A function to force a thread to exit
1172  */
1173 void CtdlThreadCancel(struct CtdlThreadNode *thread)
1174 {
1175         struct CtdlThreadNode *this_thread;
1176
1177         if (!thread)
1178                 this_thread = CtdlThreadSelf();
1179         else
1180                 this_thread = thread;
1181         if (!this_thread)
1182         {
1183                 CtdlLogPrintf(CTDL_EMERG, "Thread system PANIC. Attempt to CtdlThreadCancel() a non thread.\n");
1184                 CtdlThreadStopAll();
1185                 return;
1186         }
1187         begin_critical_section(S_THREAD_LIST);
1188         this_thread->state = CTDL_THREAD_CANCELLED;
1189         pthread_cancel(this_thread->tid);
1190         end_critical_section (S_THREAD_LIST);
1191 }
1192
1193
1194
1195 /*
1196  * A function for a thread to check if it has been asked to stop
1197  */
1198 int CtdlThreadCheckStop(void)
1199 {
1200         struct CtdlThreadNode *this_thread;
1201
1202         this_thread = CtdlThreadSelf();
1203         if (!this_thread)
1204         {
1205                 CtdlLogPrintf(CTDL_EMERG, "Thread system PANIC, CtdlThreadCheckStop() called by a non thread.\n");
1206                 CtdlThreadStopAll();
1207                 return -1;
1208         }
1209         if(this_thread->state == CTDL_THREAD_STOP_REQ)
1210         {
1211                 this_thread->state = CTDL_THREAD_STOPPING;
1212                 return -1;
1213         }
1214         else if(this_thread->state < CTDL_THREAD_STOP_REQ)
1215                 return -1;
1216
1217         return 0;
1218 }
1219
1220
1221 /*
1222  * A function to ask a thread to exit
1223  * The thread must call CtdlThreadCheckStop() periodically to determine if it should exit
1224  */
1225 void CtdlThreadStop(struct CtdlThreadNode *thread)
1226 {
1227         struct CtdlThreadNode *this_thread;
1228
1229         if (!thread)
1230                 this_thread = CtdlThreadSelf();
1231         else
1232                 this_thread = thread;
1233         if (!this_thread)
1234                 return;
1235
1236         begin_critical_section (S_THREAD_LIST);
1237         pthread_mutex_lock(&this_thread->ThreadMutex); /* To prevent race condition of a sleeping thread */
1238         if (this_thread->state > CTDL_THREAD_STOP_REQ)
1239                 this_thread->state = CTDL_THREAD_STOP_REQ;
1240         pthread_mutex_unlock(&this_thread->ThreadMutex);
1241         pthread_cond_signal(&this_thread->ThreadCond);
1242         end_critical_section(S_THREAD_LIST);
1243 }
1244
1245 /*
1246  * So we now have a sleep command that works with threads but it is in seconds
1247  */
1248 void CtdlThreadSleep(int secs)
1249 {
1250         struct timespec wake_time;
1251         struct timeval time_now;
1252         struct CtdlThreadNode *self;
1253         int state;
1254
1255
1256         self = CtdlThreadSelf();
1257         if (!self)
1258         {
1259                 CtdlLogPrintf(CTDL_WARNING, "CtdlThreadSleep() called by something that is not a thread. Should we die?\n");
1260                 return;
1261         }
1262
1263         begin_critical_section(S_THREAD_LIST);
1264         pthread_mutex_lock(&self->ThreadMutex); /* Prevent something asking us to awaken before we've gone to sleep */
1265         state = self->state;
1266         if (state == CTDL_THREAD_RUNNING)
1267                 self->state = CTDL_THREAD_SLEEPING;
1268         end_critical_section(S_THREAD_LIST);
1269
1270         if(state != CTDL_THREAD_RUNNING)
1271         {
1272                 CtdlLogPrintf(CTDL_DEBUG, "CtdlThreadSleep() called by a thread that is not running.\n");
1273                 pthread_mutex_unlock(&self->ThreadMutex);
1274                 return;
1275         }
1276
1277         memset (&wake_time, 0, sizeof(struct timespec));
1278         gettimeofday(&time_now, NULL);
1279         wake_time.tv_sec = time_now.tv_sec + secs;
1280         wake_time.tv_nsec = time_now.tv_usec * 10;
1281         pthread_cond_timedwait(&self->ThreadCond, &self->ThreadMutex, &wake_time);
1282         begin_critical_section(S_THREAD_LIST);
1283         if (self->state == CTDL_THREAD_SLEEPING) /* Don't change state if something else changed it while we were asleep */
1284                 self->state = state;
1285         pthread_mutex_unlock(&self->ThreadMutex);
1286         end_critical_section(S_THREAD_LIST);
1287 }
1288
1289
1290 /*
1291  * Routine to clean up our thread function on exit
1292  */
1293 static void ctdl_internal_thread_cleanup(void *arg)
1294 {
1295         struct CtdlThreadNode *this_thread;
1296         this_thread = CtdlThreadSelf();
1297         /*
1298          * In here we were called by the current thread because it is exiting
1299          * NB. WE ARE THE CURRENT THREAD
1300          */
1301         CtdlLogPrintf(CTDL_NOTICE, "Thread \"%s\" (%ld) exited.\n", this_thread->name, this_thread->tid);
1302         begin_critical_section(S_THREAD_LIST);
1303         #ifdef HAVE_BACKTRACE
1304         eCrash_UnregisterThread();
1305         #endif
1306         this_thread->state = CTDL_THREAD_EXITED;        // needs to be last thing else house keeping will unlink us too early
1307         end_critical_section(S_THREAD_LIST);
1308 }
1309
1310
1311
1312
1313 /*
1314  * Garbage collection routine.
1315  * Gets called by main() in a loop to clean up the thread list periodically.
1316  */
1317 void ctdl_internal_thread_gc (void)
1318 {
1319         struct CtdlThreadNode *this_thread, *that_thread;
1320         struct timespec wake_time;
1321         struct timeval time_now;
1322         int workers = 0;
1323
1324         /*
1325          * Wait on the condition variable that tells us garbage collection is needed
1326          * We wake up every 10 seconds just in case someone forgot to inform us of a thread exiting
1327          */
1328         pthread_mutex_lock(&thread_gc_mutex);
1329         memset (&wake_time, 0, sizeof(struct timespec));
1330         gettimeofday(&time_now, NULL);
1331         wake_time.tv_sec = time_now.tv_sec + 10;
1332         pthread_cond_timedwait(&thread_gc_cond, &thread_gc_mutex, &wake_time);
1333
1334         CtdlLogPrintf(CTDL_DEBUG, "Thread system running garbage collection.\n");
1335         /*
1336          * Woke up to do garbage collection
1337          */
1338         begin_critical_section(S_THREAD_LIST);
1339         this_thread = CtdlThreadList;
1340         while(this_thread)
1341         {
1342                 that_thread = this_thread;
1343                 this_thread = this_thread->next;
1344
1345                 CtdlLogPrintf(CTDL_DEBUG, "CtdlThread, \"%s\" (%ld) \"%s\".\n", that_thread->name, that_thread->tid, CtdlThreadStates[that_thread->state]);
1346                 /* Do we need to clean up this thread? */
1347                 if (that_thread->state != CTDL_THREAD_EXITED)
1348                 {
1349                         if(that_thread->flags & CTDLTHREAD_WORKER)
1350                                 workers++;      /* Sanity check on number of worker threads */
1351                         continue;
1352                 }
1353
1354                 if (pthread_equal(that_thread->tid, pthread_self()))
1355                 {       /* Sanity check */
1356                         end_critical_section(S_THREAD_LIST);
1357                         CtdlLogPrintf(CTDL_EMERG, "Thread system PANIC, a thread is trying to clean up after itself.\n");
1358                         pthread_mutex_unlock(&thread_gc_mutex);
1359                         CtdlThreadStopAll();
1360                         return;
1361                 }
1362
1363                 if (num_threads <= 0)
1364                 {       /* Sanity check */
1365                         end_critical_section (S_THREAD_LIST);
1366                         CtdlLogPrintf(CTDL_EMERG, "Thread system PANIC, num_threads <= 0 and trying to do Garbage Collection.\n");
1367                         pthread_mutex_unlock(&thread_gc_mutex);
1368                         CtdlThreadStopAll();
1369                         return;
1370                 }
1371
1372                 /* If we are unlinking the list head then the next becomes the list head */
1373                 if (that_thread == CtdlThreadList)
1374                         CtdlThreadList = that_thread->next;
1375                 if(that_thread->prev)
1376                         that_thread->prev->next = that_thread->next;
1377                 if(that_thread->next)
1378                         that_thread->next->prev = that_thread->next;
1379                 num_threads--;
1380                 if(that_thread->flags & CTDLTHREAD_WORKER)
1381                         num_workers--;  /* This is a wroker thread so reduce the count. */
1382
1383                 /*
1384                  * Join on the thread to do clean up and prevent memory leaks
1385                  * Also makes sure the thread has cleaned up after itself before we remove it from the list
1386                  */
1387                 pthread_join (that_thread->tid, NULL);
1388
1389                 /*
1390                  * Now we own that thread entry
1391                  */
1392                 CtdlLogPrintf(CTDL_INFO, "Garbage Collection for thread \"%s\" (%ld).\n", that_thread->name, that_thread->tid);
1393                 if(that_thread->name)
1394                         free(that_thread->name);
1395                 pthread_mutex_destroy(&that_thread->ThreadMutex);
1396                 pthread_cond_destroy(&that_thread->ThreadCond);
1397                 pthread_attr_destroy(&that_thread->attr);
1398                 free(that_thread);
1399         }
1400
1401         /* Sanity check number of worker threads */
1402         if (workers != num_workers)
1403         {
1404                 end_critical_section(S_THREAD_LIST);
1405                 CtdlLogPrintf(CTDL_EMERG, "Thread system PANIC, discrepancy in number of worker threads. Counted %d, should be %d.\n", workers, num_workers);
1406                 pthread_mutex_unlock(&thread_gc_mutex);
1407 //              CtdlThreadStopAll();
1408                 return;
1409         }
1410         pthread_mutex_unlock(&thread_gc_mutex);
1411
1412         end_critical_section(S_THREAD_LIST);
1413 }
1414
1415
1416
1417
1418 /*
1419  * Runtime function for a Citadel Thread.
1420  * This initialises the threads environment and then calls the user supplied thread function
1421  * Note that this is the REAL thread function and wraps the users thread function.
1422  */
1423 static void *ctdl_internal_thread_func (void *arg)
1424 {
1425         struct CtdlThreadNode *this_thread;
1426         void *ret = NULL;
1427
1428         /* lock and unlock the thread list.
1429          * This causes this thread to wait until all its creation stuff has finished before it
1430          * can continue its execution.
1431          */
1432         begin_critical_section(S_THREAD_LIST);
1433         // Get our thread data structure
1434         this_thread = (struct CtdlThreadNode *) arg;
1435         this_thread->state = CTDL_THREAD_RUNNING;
1436         this_thread->pid = getpid();
1437         end_critical_section(S_THREAD_LIST);
1438
1439         // Tell the world we are here
1440         CtdlLogPrintf(CTDL_NOTICE, "Created a new thread \"%s\" (%ld). \n", this_thread->name, this_thread->tid);
1441
1442         // Register the cleanup function to take care of when we exit.
1443         pthread_cleanup_push(ctdl_internal_thread_cleanup, NULL);
1444
1445
1446         /*
1447          * run the thread to do the work
1448          */
1449         ret = (this_thread->thread_func)(this_thread->user_args);
1450
1451         /*
1452          * Our thread is exiting either because it wanted to end or because the server is stopping
1453          * We need to clean up
1454          */
1455         pthread_cleanup_pop(1); // Execute our cleanup routine and remove it
1456
1457         return(ret);
1458 }
1459
1460
1461
1462 /*
1463  * Internal function to create a thread.
1464  * Must be called from within a S_THREAD_LIST critical section
1465  */
1466 struct CtdlThreadNode *ctdl_internal_create_thread(char *name, long flags, void *(*thread_func) (void *arg), void *args)
1467 {
1468         int ret = 0;
1469         struct CtdlThreadNode *this_thread;
1470         int sigtrick = 0;
1471         sigset_t old_signal_set;
1472
1473         if (num_threads >= 32767)
1474         {
1475                 CtdlLogPrintf(CTDL_EMERG, "Thread system. Thread list full.\n");
1476                 return NULL;
1477         }
1478
1479         this_thread = malloc(sizeof(struct CtdlThreadNode));
1480         if (this_thread == NULL) {
1481                 CtdlLogPrintf(CTDL_EMERG, "Thread system, can't allocate CtdlThreadNode, exiting\n");
1482                 return NULL;
1483         }
1484         // Ensuring this is zero'd means we make sure the thread doesn't start doing its thing until we are ready.
1485         memset (this_thread, 0, sizeof(struct CtdlThreadNode));
1486
1487         this_thread->state = CTDL_THREAD_CREATE;
1488
1489         if ((ret = pthread_attr_init(&this_thread->attr))) {
1490                 CtdlLogPrintf(CTDL_EMERG, "Thread system, pthread_attr_init: %s\n", strerror(ret));
1491                 free(this_thread);
1492                 return NULL;
1493         }
1494
1495         /* Our per-thread stacks need to be bigger than the default size,
1496          * otherwise the MIME parser crashes on FreeBSD, and the IMAP service
1497          * crashes on 64-bit Linux.
1498          */
1499         if (flags & CTDLTHREAD_BIGSTACK)
1500         {
1501                 CtdlLogPrintf(CTDL_INFO, "Thread system. Creating BIG STACK thread.\n");
1502                 if ((ret = pthread_attr_setstacksize(&this_thread->attr, THREADSTACKSIZE))) {
1503                         CtdlLogPrintf(CTDL_EMERG, "Thread system, pthread_attr_setstacksize: %s\n",
1504                                 strerror(ret));
1505                         pthread_attr_destroy(&this_thread->attr);
1506                         free(this_thread);
1507                         return NULL;
1508                 }
1509         }
1510
1511         /*
1512          * If we got here we are going to create the thread so we must initilise the structure
1513          * first because most implimentations of threading can't create it in a stopped state
1514          * and it might want to do things with its structure that aren't initialised otherwise.
1515          */
1516         if(name)
1517         {
1518                 this_thread->name = strdup(name);
1519         }
1520         else
1521         {
1522                 this_thread->name = strdup("Un-named Thread");
1523         }
1524
1525         this_thread->flags = flags;
1526         this_thread->thread_func = thread_func;
1527         this_thread->user_args = args;
1528         pthread_mutex_init (&(this_thread->ThreadMutex), NULL);
1529         pthread_cond_init (&(this_thread->ThreadCond), NULL);
1530
1531         /*
1532          * We want to make sure that only the main thread handles signals,
1533          * so that each signal is handled exactly once.  To do this, we
1534          * make sure that each new thread has all the signals that we
1535          * handle blocked.  To avoid race conditions, we block them in
1536          * the spawning thread first, then create the new thread (which
1537          * inherits the settings), and then restore the old settings in
1538          * the spawning thread.  This means that there is a brief period
1539          * when no signals will be processed, but during that time they
1540          * should be queued by the operating system.
1541          */
1542         if (pthread_equal(GC_thread, pthread_self()))
1543             sigtrick = ctdl_thread_internal_block_signals(&old_signal_set) == 0;
1544
1545         /*
1546          * We pass this_thread into the thread as its args so that it can find out information
1547          * about itself and it has a bit of storage space for itself, not to mention that the REAL
1548          * thread function needs to finish off the setup of the structure
1549          */
1550         if ((ret = pthread_create(&this_thread->tid, &this_thread->attr, ctdl_internal_thread_func, this_thread) != 0))
1551         {
1552
1553                 CtdlLogPrintf(CTDL_ALERT, "Thread system, Can't create thread: %s\n",
1554                         strerror(ret));
1555                 if (this_thread->name)
1556                         free (this_thread->name);
1557                 pthread_mutex_destroy(&(this_thread->ThreadMutex));
1558                 pthread_cond_destroy(&(this_thread->ThreadCond));
1559                 pthread_attr_destroy(&this_thread->attr);
1560                 free(this_thread);
1561                 if (sigtrick)
1562                         ctdl_thread_internal_restore_signals(&old_signal_set);
1563                 return NULL;
1564         }
1565
1566         if (sigtrick)
1567                 ctdl_thread_internal_restore_signals(&old_signal_set);
1568
1569         num_threads++;  // Increase the count of threads in the system.
1570         if(this_thread->flags & CTDLTHREAD_WORKER)
1571                 num_workers++;
1572
1573         this_thread->next = CtdlThreadList;
1574         CtdlThreadList = this_thread;
1575         if (this_thread->next)
1576                 this_thread->next->prev = this_thread;
1577         // Register for tracing
1578         #ifdef HAVE_BACKTRACE
1579         eCrash_RegisterThread(this_thread->name, 0);
1580         #endif
1581         return this_thread;
1582 }
1583
1584 /*
1585  * Wrapper function to create a thread
1586  * ensures the critical section and other protections are in place.
1587  * char *name = name to give to thread, if NULL, use generic name
1588  * int flags = flags to determine type of thread and standard facilities
1589  */
1590 struct CtdlThreadNode *CtdlThreadCreate(char *name, long flags, void *(*thread_func) (void *arg), void *args)
1591 {
1592         struct CtdlThreadNode *ret = NULL;
1593
1594         begin_critical_section(S_THREAD_LIST);
1595         ret = ctdl_internal_create_thread(name, flags, thread_func, args);
1596         end_critical_section(S_THREAD_LIST);
1597         return ret;
1598 }
1599
1600
1601
1602
1603 /*
1604  * Purge all sessions which have the 'kill_me' flag set.
1605  * This function has code to prevent it from running more than once every
1606  * few seconds, because running it after every single unbind would waste a lot
1607  * of CPU time and keep the context list locked too much.  To force it to run
1608  * anyway, set "force" to nonzero.
1609  *
1610  *
1611  * After that's done, we raise the size of the worker thread pool
1612  * if such an action is appropriate.
1613  */
1614 void dead_session_purge(int force) {
1615         struct CitContext *ptr, *ptr2;          /* general-purpose utility pointer */
1616         struct CitContext *rem = NULL;  /* list of sessions to be destroyed */
1617
1618         if (force == 0) {
1619                 if ( (time(NULL) - last_purge) < 5 ) {
1620                         return; /* Too soon, go away */
1621                 }
1622         }
1623         time(&last_purge);
1624
1625         begin_critical_section(S_SESSION_TABLE);
1626         ptr = ContextList;
1627         while (ptr) {
1628                 ptr2 = ptr;
1629                 ptr = ptr->next;
1630
1631                 if ( (ptr2->state == CON_IDLE) && (ptr2->kill_me) ) {
1632                         /* Remove the session from the active list */
1633                         if (ptr2->prev) {
1634                                 ptr2->prev->next = ptr2->next;
1635                         }
1636                         else {
1637                                 ContextList = ptr2->next;
1638                         }
1639                         if (ptr2->next) {
1640                                 ptr2->next->prev = ptr2->prev;
1641                         }
1642
1643                         --num_sessions;
1644
1645                         /* And put it on our to-be-destroyed list */
1646                         ptr2->next = rem;
1647                         rem = ptr2;
1648
1649                 }
1650         }
1651         end_critical_section(S_SESSION_TABLE);
1652
1653         /* Now that we no longer have the session list locked, we can take
1654          * our time and destroy any sessions on the to-be-killed list, which
1655          * is allocated privately on this thread's stack.
1656          */
1657         while (rem != NULL) {
1658                 CtdlLogPrintf(CTDL_DEBUG, "Purging session %d\n", rem->cs_pid);
1659                 RemoveContext(rem);
1660                 ptr = rem;
1661                 rem = rem->next;
1662                 free(ptr);
1663         }
1664
1665         /* Raise the size of the worker thread pool if necessary. */
1666         begin_critical_section(S_THREAD_LIST);
1667         if ( (num_sessions > num_workers)
1668            && (num_workers < config.c_max_workers) ) {
1669                 ctdl_internal_create_thread(NULL, CTDLTHREAD_BIGSTACK + CTDLTHREAD_WORKER, worker_thread, NULL);
1670         }
1671         end_critical_section(S_THREAD_LIST);
1672         // FIXME: reduce the number of worker threads too
1673 }
1674
1675
1676
1677
1678
1679 /*
1680  * masterCC is the context we use when not attached to a session.  This
1681  * function initializes it.
1682  */
1683 void InitializeMasterCC(void) {
1684         memset(&masterCC, 0, sizeof(struct CitContext));
1685         masterCC.internal_pgm = 1;
1686         masterCC.cs_pid = 0;
1687 }
1688
1689
1690
1691
1692
1693
1694 /*
1695  * Bind a thread to a context.  (It's inline merely to speed things up.)
1696  */
1697 INLINE void become_session(struct CitContext *which_con) {
1698         pthread_setspecific(MyConKey, (void *)which_con );
1699 }
1700
1701
1702
1703 /*
1704  * This loop just keeps going and going and going...
1705  */
1706 void *worker_thread(void *arg) {
1707         int i;
1708         int highest;
1709         struct CitContext *ptr;
1710         struct CitContext *bind_me = NULL;
1711         fd_set readfds;
1712         int retval = 0;
1713         struct CitContext *con= NULL;   /* Temporary context pointer */
1714         struct ServiceFunctionHook *serviceptr;
1715         int ssock;                      /* Descriptor for client socket */
1716         struct timeval tv;
1717         int force_purge = 0;
1718         int m;
1719
1720         cdb_allocate_tsd();
1721
1722         while (!CtdlThreadCheckStop()) {
1723
1724                 /* make doubly sure we're not holding any stale db handles
1725                  * which might cause a deadlock.
1726                  */
1727                 cdb_check_handles();
1728 do_select:      force_purge = 0;
1729                 bind_me = NULL;         /* Which session shall we handle? */
1730
1731                 /* Initialize the fdset. */
1732                 FD_ZERO(&readfds);
1733                 highest = 0;
1734
1735                 begin_critical_section(S_SESSION_TABLE);
1736                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1737                         if (ptr->state == CON_IDLE) {
1738                                 FD_SET(ptr->client_socket, &readfds);
1739                                 if (ptr->client_socket > highest)
1740                                         highest = ptr->client_socket;
1741                         }
1742                         if ((bind_me == NULL) && (ptr->state == CON_READY)) {
1743                                 bind_me = ptr;
1744                                 ptr->state = CON_EXECUTING;
1745                         }
1746                 }
1747                 end_critical_section(S_SESSION_TABLE);
1748
1749                 if (bind_me) {
1750                         goto SKIP_SELECT;
1751                 }
1752
1753                 /* If we got this far, it means that there are no sessions
1754                  * which a previous thread marked for attention, so we go
1755                  * ahead and get ready to select().
1756                  */
1757
1758                 /* First, add the various master sockets to the fdset. */
1759                 for (serviceptr = ServiceHookTable; serviceptr != NULL;
1760                 serviceptr = serviceptr->next ) {
1761                         m = serviceptr->msock;
1762                         FD_SET(m, &readfds);
1763                         if (m > highest) {
1764                                 highest = m;
1765                         }
1766                 }
1767
1768                 if (!CtdlThreadCheckStop()) {
1769                         tv.tv_sec = 1;          /* wake up every second if no input */
1770                         tv.tv_usec = 0;
1771                         retval = select(highest + 1, &readfds, NULL, NULL, &tv);
1772                 }
1773
1774                 if (CtdlThreadCheckStop()) return(NULL);
1775
1776                 /* Now figure out who made this select() unblock.
1777                  * First, check for an error or exit condition.
1778                  */
1779                 if (retval < 0) {
1780                         if (errno == EBADF) {
1781                                 CtdlLogPrintf(CTDL_NOTICE, "select() failed: (%s)\n",
1782                                         strerror(errno));
1783                                 goto do_select;
1784                         }
1785                         if (errno != EINTR) {
1786                                 CtdlLogPrintf(CTDL_EMERG, "Exiting (%s)\n", strerror(errno));
1787                                 CtdlThreadStopAll();
1788                         } else if (!CtdlThreadCheckStop()) {
1789                                 CtdlLogPrintf(CTDL_DEBUG, "Un handled select failure.\n");
1790                                 goto do_select;
1791                         }
1792                 }
1793                 else if(retval == 0) {
1794                         goto SKIP_SELECT;
1795                 }
1796                 /* Next, check to see if it's a new client connecting
1797                  * on a master socket.
1798                  */
1799                 else for (serviceptr = ServiceHookTable; serviceptr != NULL;
1800                      serviceptr = serviceptr->next ) {
1801
1802                         if (FD_ISSET(serviceptr->msock, &readfds)) {
1803                                 ssock = accept(serviceptr->msock, NULL, 0);
1804                                 if (ssock >= 0) {
1805                                         CtdlLogPrintf(CTDL_DEBUG,
1806                                                 "New client socket %d\n",
1807                                                 ssock);
1808
1809                                         /* The master socket is non-blocking but the client
1810                                          * sockets need to be blocking, otherwise certain
1811                                          * operations barf on FreeBSD.  Not a fatal error.
1812                                          */
1813                                         if (fcntl(ssock, F_SETFL, 0) < 0) {
1814                                                 CtdlLogPrintf(CTDL_EMERG,
1815                                                         "citserver: Can't set socket to blocking: %s\n",
1816                                                         strerror(errno));
1817                                         }
1818
1819                                         /* New context will be created already
1820                                          * set up in the CON_EXECUTING state.
1821                                          */
1822                                         con = CreateNewContext();
1823
1824                                         /* Assign our new socket number to it. */
1825                                         con->client_socket = ssock;
1826                                         con->h_command_function =
1827                                                 serviceptr->h_command_function;
1828                                         con->h_async_function =
1829                                                 serviceptr->h_async_function;
1830                                         con->ServiceName =
1831                                                 serviceptr->ServiceName;
1832
1833                                         /* Determine whether it's a local socket */
1834                                         if (serviceptr->sockpath != NULL)
1835                                                 con->is_local_socket = 1;
1836
1837                                         /* Set the SO_REUSEADDR socket option */
1838                                         i = 1;
1839                                         setsockopt(ssock, SOL_SOCKET,
1840                                                 SO_REUSEADDR,
1841                                                 &i, sizeof(i));
1842
1843                                         become_session(con);
1844                                         begin_session(con);
1845                                         serviceptr->h_greeting_function();
1846                                         become_session(NULL);
1847                                         con->state = CON_IDLE;
1848                                         goto do_select;
1849                                 }
1850                         }
1851                 }
1852
1853                 /* It must be a client socket.  Find a context that has data
1854                  * waiting on its socket *and* is in the CON_IDLE state.  Any
1855                  * active sockets other than our chosen one are marked as
1856                  * CON_READY so the next thread that comes around can just bind
1857                  * to one without having to select() again.
1858                  */
1859                 begin_critical_section(S_SESSION_TABLE);
1860                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1861                         if ( (FD_ISSET(ptr->client_socket, &readfds))
1862                            && (ptr->state != CON_EXECUTING) ) {
1863                                 ptr->input_waiting = 1;
1864                                 if (!bind_me) {
1865                                         bind_me = ptr;  /* I choose you! */
1866                                         bind_me->state = CON_EXECUTING;
1867                                 }
1868                                 else {
1869                                         ptr->state = CON_READY;
1870                                 }
1871                         }
1872                 }
1873                 end_critical_section(S_SESSION_TABLE);
1874
1875 SKIP_SELECT:
1876                 /* We're bound to a session */
1877                 if (bind_me != NULL) {
1878                         become_session(bind_me);
1879
1880                         /* If the client has sent a command, execute it. */
1881                         if (CC->input_waiting) {
1882                                 CC->h_command_function();
1883                                 CC->input_waiting = 0;
1884                         }
1885
1886                         /* If there are asynchronous messages waiting and the
1887                          * client supports it, do those now */
1888                         if ((CC->is_async) && (CC->async_waiting)
1889                            && (CC->h_async_function != NULL)) {
1890                                 CC->h_async_function();
1891                                 CC->async_waiting = 0;
1892                         }
1893
1894                         force_purge = CC->kill_me;
1895                         become_session(NULL);
1896                         bind_me->state = CON_IDLE;
1897                 }
1898
1899                 dead_session_purge(force_purge);
1900                 do_housekeeping();
1901                 check_sched_shutdown();
1902         }
1903         /* If control reaches this point, the server is shutting down */
1904         return(NULL);
1905 }
1906
1907
1908
1909
1910 /*
1911  * SyslogFacility()
1912  * Translate text facility name to syslog.h defined value.
1913  */
1914 int SyslogFacility(char *name)
1915 {
1916         int i;
1917         struct
1918         {
1919                 int facility;
1920                 char *name;
1921         }   facTbl[] =
1922         {
1923                 {   LOG_KERN,   "kern"          },
1924                 {   LOG_USER,   "user"          },
1925                 {   LOG_MAIL,   "mail"          },
1926                 {   LOG_DAEMON, "daemon"        },
1927                 {   LOG_AUTH,   "auth"          },
1928                 {   LOG_SYSLOG, "syslog"        },
1929                 {   LOG_LPR,    "lpr"           },
1930                 {   LOG_NEWS,   "news"          },
1931                 {   LOG_UUCP,   "uucp"          },
1932                 {   LOG_LOCAL0, "local0"        },
1933                 {   LOG_LOCAL1, "local1"        },
1934                 {   LOG_LOCAL2, "local2"        },
1935                 {   LOG_LOCAL3, "local3"        },
1936                 {   LOG_LOCAL4, "local4"        },
1937                 {   LOG_LOCAL5, "local5"        },
1938                 {   LOG_LOCAL6, "local6"        },
1939                 {   LOG_LOCAL7, "local7"        },
1940                 {   0,            NULL          }
1941         };
1942         for(i = 0; facTbl[i].name != NULL; i++) {
1943                 if(!strcasecmp(name, facTbl[i].name))
1944                         return facTbl[i].facility;
1945         }
1946         enable_syslog = 0;
1947         return LOG_DAEMON;
1948 }
1949
1950
1951 /********** MEM CHEQQER ***********/
1952
1953 #ifdef DEBUG_MEMORY_LEAKS
1954
1955 #undef malloc
1956 #undef realloc
1957 #undef strdup
1958 #undef free
1959
1960 void *tracked_malloc(size_t size, char *file, int line) {
1961         struct igheap *thisheap;
1962         void *block;
1963
1964         block = malloc(size);
1965         if (block == NULL) return(block);
1966
1967         thisheap = malloc(sizeof(struct igheap));
1968         if (thisheap == NULL) {
1969                 free(block);
1970                 return(NULL);
1971         }
1972
1973         thisheap->block = block;
1974         strcpy(thisheap->file, file);
1975         thisheap->line = line;
1976
1977         begin_critical_section(S_DEBUGMEMLEAKS);
1978         thisheap->next = igheap;
1979         igheap = thisheap;
1980         end_critical_section(S_DEBUGMEMLEAKS);
1981
1982         return(block);
1983 }
1984
1985
1986 void *tracked_realloc(void *ptr, size_t size, char *file, int line) {
1987         struct igheap *thisheap;
1988         void *block;
1989
1990         block = realloc(ptr, size);
1991         if (block == NULL) return(block);
1992
1993         thisheap = malloc(sizeof(struct igheap));
1994         if (thisheap == NULL) {
1995                 free(block);
1996                 return(NULL);
1997         }
1998
1999         thisheap->block = block;
2000         strcpy(thisheap->file, file);
2001         thisheap->line = line;
2002
2003         begin_critical_section(S_DEBUGMEMLEAKS);
2004         thisheap->next = igheap;
2005         igheap = thisheap;
2006         end_critical_section(S_DEBUGMEMLEAKS);
2007
2008         return(block);
2009 }
2010
2011
2012
2013 void tracked_free(void *ptr) {
2014         struct igheap *thisheap;
2015         struct igheap *trash;
2016
2017         free(ptr);
2018
2019         if (igheap == NULL) return;
2020         begin_critical_section(S_DEBUGMEMLEAKS);
2021         for (thisheap = igheap; thisheap != NULL; thisheap = thisheap->next) {
2022                 if (thisheap->next != NULL) {
2023                         if (thisheap->next->block == ptr) {
2024                                 trash = thisheap->next;
2025                                 thisheap->next = thisheap->next->next;
2026                                 free(trash);
2027                         }
2028                 }
2029         }
2030         if (igheap->block == ptr) {
2031                 trash = igheap;
2032                 igheap = igheap->next;
2033                 free(trash);
2034         }
2035         end_critical_section(S_DEBUGMEMLEAKS);
2036 }
2037
2038 char *tracked_strdup(const char *s, char *file, int line) {
2039         char *ptr;
2040
2041         if (s == NULL) return(NULL);
2042         ptr = tracked_malloc(strlen(s) + 1, file, line);
2043         if (ptr == NULL) return(NULL);
2044         strncpy(ptr, s, strlen(s));
2045         return(ptr);
2046 }
2047
2048 void dump_heap(void) {
2049         struct igheap *thisheap;
2050
2051         for (thisheap = igheap; thisheap != NULL; thisheap = thisheap->next) {
2052                 CtdlLogPrintf(CTDL_CRIT, "UNFREED: %30s : %d\n",
2053                         thisheap->file, thisheap->line);
2054         }
2055 }
2056
2057 #endif /*  DEBUG_MEMORY_LEAKS */