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 #define SHOW_ME_VAPPEND_PRINTF
  53 #include <libcitadel.h>
  54 #include "citadel.h"
  55 #include "server.h"
  56 #include "sysdep_decls.h"
  57 #include "citserver.h"
  58 #include "support.h"
  59 #include "config.h"
  60 #include "database.h"
  61 #include "housekeeping.h"
  62 #include "modules/crypto/serv_crypto.h" /* Needed for init_ssl, client_write_ssl, client_read_ssl, destruct_ssl */
  63 #include "ecrash.h"
  64 #include "context.h"
  65
  66 #ifdef HAVE_SYS_SELECT_H
  67 #include <sys/select.h>
  68 #endif
  69
  70 #ifndef HAVE_SNPRINTF
  71 #include "snprintf.h"
  72 #endif
  73
  74 #include "ctdl_module.h"
  75 #include "threads.h"
  76 #include "user_ops.h"
  77 #include "control.h"
  78
  79
  80 #ifdef DEBUG_MEMORY_LEAKS
  81 struct igheap {
  82         struct igheap *next;
  83         char file[32];
  84         int line;
  85         void *block;
  86 };
  87
  88 struct igheap *igheap = NULL;
  89 #endif
  90
  91
  92 int verbosity = DEFAULT_VERBOSITY;              /* Logging level */
  93
  94 int syslog_facility = LOG_DAEMON;
  95 int enable_syslog = 0;
  96 int print_to_logfile = 1;
  97
  98 /*
  99  * CtdlLogPrintf()  ...   Write logging information
 100  */
 101 void CtdlLogPrintf(enum LogLevel loglevel, const char *format, ...) {
 102         va_list arg_ptr;
 103         va_start(arg_ptr, format);
 104         vCtdlLogPrintf(loglevel, format, arg_ptr);
 105         va_end(arg_ptr);
 106 }
 107
 108 void vCtdlLogPrintf(enum LogLevel loglevel, const char *format, va_list arg_ptr)
 109 {
 110
 111         if (enable_syslog) {
 112                 vsyslog((syslog_facility | loglevel), format, arg_ptr);
 113         }
 114
 115         /* stderr output code */
 116         if (enable_syslog || !print_to_logfile) return;
 117
 118         /* if we run in forground and syslog is disabled, log to terminal */
 119         if (loglevel <= verbosity) {
 120                 struct timeval tv;
 121                 struct tm tim;
 122                 time_t unixtime;
 123                 CitContext *CCC = CC;
 124                 ThreadTSD *cTSD = CTP;
 125                 CtdlThreadNode *node = NULL;
 126                 long lwpid = 0;
 127
 128                 if (cTSD != NULL) {
 129                         node = cTSD->self;
 130                 }
 131
 132                 if ((node != NULL) && (node->reltid != 0)) {
 133                         lwpid = node->reltid;
 134                 }
 135
 136                 gettimeofday(&tv, NULL);
 137
 138                 /* Promote to time_t; types differ on some OSes (like darwin) */
 139                 unixtime = tv.tv_sec;
 140                 localtime_r(&unixtime, &tim);
 141
 142                 fprintf(stderr,
 143                         "%04d/%02d/%02d %2d:%02d:%02d.%06ld ",
 144                         tim.tm_year + 1900, tim.tm_mon + 1,
 145                         tim.tm_mday, tim.tm_hour, tim.tm_min,
 146                         tim.tm_sec, (long)tv.tv_usec
 147                 );
 148
 149                 if (lwpid != 0) {
 150                         fprintf(stderr, "[LWP:%ld] ", lwpid);
 151                 }
 152
 153                 if (CCC != NULL) {
 154                         if (CCC->cs_pid != 0) {
 155                                 fprintf(stderr, "[%3d] ", CCC->cs_pid);
 156                         }
 157                         else if (CCC->user.usernum != 0) {
 158                                 fprintf(stderr, "[:%ld] ", CCC->user.usernum);
 159                         }
 160                 }
 161
 162                 vfprintf(stderr, format, arg_ptr);
 163                 fflush(stderr);
 164         }
 165 }
 166
 167
 168
 169 /*
 170  * Signal handler to shut down the server.
 171  */
 172
 173 volatile int exit_signal = 0;
 174 volatile int shutdown_and_halt = 0;
 175 volatile int restart_server = 0;
 176 volatile int running_as_daemon = 0;
 177
 178 static RETSIGTYPE signal_cleanup(int signum) {
 179
 180         if (CT)
 181                 CT->signal = signum;
 182         else
 183         {
 184                 CtdlLogPrintf(CTDL_DEBUG, "Caught signal %d; shutting down.\n", signum);
 185                 exit_signal = signum;
 186         }
 187 }
 188
 189 static RETSIGTYPE signal_exit(int signum) {
 190         exit(1);
 191 }
 192
 193
 194
 195 /*
 196  * Some initialization stuff...
 197  */
 198 void init_sysdep(void) {
 199         sigset_t set;
 200
 201         /* Avoid vulnerabilities related to FD_SETSIZE if we can. */
 202 #ifdef FD_SETSIZE
 203 #ifdef RLIMIT_NOFILE
 204         struct rlimit rl;
 205         getrlimit(RLIMIT_NOFILE, &rl);
 206         rl.rlim_cur = FD_SETSIZE;
 207         rl.rlim_max = FD_SETSIZE;
 208         setrlimit(RLIMIT_NOFILE, &rl);
 209 #endif
 210 #endif
 211
 212         /* If we've got OpenSSL, we're going to use it. */
 213 #ifdef HAVE_OPENSSL
 214         init_ssl();
 215 #endif
 216
 217         /*
 218          * Set up a place to put thread-specific data.
 219          * We only need a single pointer per thread - it points to the
 220          * CitContext structure (in the ContextList linked list) of the
 221          * session to which the calling thread is currently bound.
 222          */
 223         if (citthread_key_create(&MyConKey, NULL) != 0) {
 224                 CtdlLogPrintf(CTDL_CRIT, "Can't create TSD key: %s\n",
 225                         strerror(errno));
 226         }
 227
 228         /*
 229          * The action for unexpected signals and exceptions should be to
 230          * call signal_cleanup() to gracefully shut down the server.
 231          */
 232         sigemptyset(&set);
 233         sigaddset(&set, SIGINT);                // intr = shutdown
 234         // sigaddset(&set, SIGQUIT);            // quit = force quit
 235         sigaddset(&set, SIGHUP);
 236         sigaddset(&set, SIGTERM);
 237         // sigaddset(&set, SIGSEGV);            // we want core dumps
 238         // sigaddset(&set, SIGILL);             // we want core dumps
 239         // sigaddset(&set, SIGBUS);
 240         sigprocmask(SIG_UNBLOCK, &set, NULL);
 241
 242         signal(SIGINT, signal_cleanup);         // intr = shutdown
 243         // signal(SIGQUIT, signal_cleanup);     // quit = force quit
 244         signal(SIGHUP, signal_cleanup);
 245         signal(SIGTERM, signal_cleanup);
 246         signal(SIGUSR2, signal_exit);
 247         // signal(SIGSEGV, signal_cleanup);     // we want coredumps
 248         // signal(SIGILL, signal_cleanup);      // we want core dumps
 249         // signal(SIGBUS, signal_cleanup);
 250
 251         /*
 252          * Do not shut down the server on broken pipe signals, otherwise the
 253          * whole Citadel service would come down whenever a single client
 254          * socket breaks.
 255          */
 256         signal(SIGPIPE, SIG_IGN);
 257 }
 258
 259
 260
 261
 262 /*
 263  * This is a generic function to set up a master socket for listening on
 264  * a TCP port.  The server shuts down if the bind fails.
 265  *
 266  */
 267 int ig_tcp_server(char *ip_addr, int port_number, int queue_len, char **errormessage)
 268 {
 269         struct sockaddr_in sin;
 270         int s, i;
 271         int actual_queue_len;
 272
 273         actual_queue_len = queue_len;
 274         if (actual_queue_len < 5) actual_queue_len = 5;
 275
 276         memset(&sin, 0, sizeof(sin));
 277         sin.sin_family = AF_INET;
 278         sin.sin_port = htons((u_short)port_number);
 279         if (ip_addr == NULL) {
 280                 sin.sin_addr.s_addr = INADDR_ANY;
 281         }
 282         else {
 283                 sin.sin_addr.s_addr = inet_addr(ip_addr);
 284         }
 285
 286         if (sin.sin_addr.s_addr == !INADDR_ANY) {
 287                 sin.sin_addr.s_addr = INADDR_ANY;
 288         }
 289
 290         s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 291
 292         if (s < 0) {
 293                 *errormessage = (char*) malloc(SIZ + 1);
 294                 snprintf(*errormessage, SIZ,
 295                                  "citserver: Can't create a socket: %s",
 296                                  strerror(errno));
 297                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 298                 return(-1);
 299         }
 300
 301         i = 1;
 302         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 303
 304         if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
 305                 *errormessage = (char*) malloc(SIZ + 1);
 306                 snprintf(*errormessage, SIZ,
 307                                  "citserver: Can't bind: %s",
 308                                  strerror(errno));
 309                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 310                 close(s);
 311                 return(-1);
 312         }
 313
 314         /* set to nonblock - we need this for some obscure situations */
 315         if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
 316                 *errormessage = (char*) malloc(SIZ + 1);
 317                 snprintf(*errormessage, SIZ,
 318                                  "citserver: Can't set socket to non-blocking: %s",
 319                                  strerror(errno));
 320                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 321                 close(s);
 322                 return(-1);
 323         }
 324
 325         if (listen(s, actual_queue_len) < 0) {
 326                 *errormessage = (char*) malloc(SIZ + 1);
 327                 snprintf(*errormessage, SIZ,
 328                                  "citserver: Can't listen: %s",
 329                                  strerror(errno));
 330                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 331                 close(s);
 332                 return(-1);
 333         }
 334
 335         return(s);
 336 }
 337
 338
 339
 340 /*
 341  * Create a Unix domain socket and listen on it
 342  */
 343 int ig_uds_server(char *sockpath, int queue_len, char **errormessage)
 344 {
 345         struct sockaddr_un addr;
 346         int s;
 347         int i;
 348         int actual_queue_len;
 349 #ifdef HAVE_STRUCT_UCRED
 350         int passcred = 1;
 351 #endif
 352
 353         actual_queue_len = queue_len;
 354         if (actual_queue_len < 5) actual_queue_len = 5;
 355
 356         i = unlink(sockpath);
 357         if ((i != 0) && (errno != ENOENT)) {
 358                 *errormessage = (char*) malloc(SIZ + 1);
 359                 snprintf(*errormessage, SIZ, "citserver: can't unlink %s: %s",
 360                         sockpath, strerror(errno));
 361                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 362                 return(-1);
 363         }
 364
 365         memset(&addr, 0, sizeof(addr));
 366         addr.sun_family = AF_UNIX;
 367         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 368
 369         s = socket(AF_UNIX, SOCK_STREAM, 0);
 370         if (s < 0) {
 371                 *errormessage = (char*) malloc(SIZ + 1);
 372                 snprintf(*errormessage, SIZ,
 373                          "citserver: Can't create a socket: %s",
 374                          strerror(errno));
 375                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 376                 return(-1);
 377         }
 378
 379         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 380                 *errormessage = (char*) malloc(SIZ + 1);
 381                 snprintf(*errormessage, SIZ,
 382                          "citserver: Can't bind: %s",
 383                          strerror(errno));
 384                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 385                 return(-1);
 386         }
 387
 388         /* set to nonblock - we need this for some obscure situations */
 389         if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
 390                 *errormessage = (char*) malloc(SIZ + 1);
 391                 snprintf(*errormessage, SIZ,
 392                          "citserver: Can't set socket to non-blocking: %s",
 393                          strerror(errno));
 394                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 395                 close(s);
 396                 return(-1);
 397         }
 398
 399         if (listen(s, actual_queue_len) < 0) {
 400                 *errormessage = (char*) malloc(SIZ + 1);
 401                 snprintf(*errormessage, SIZ,
 402                          "citserver: Can't listen: %s",
 403                          strerror(errno));
 404                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 405                 return(-1);
 406         }
 407
 408 #ifdef HAVE_STRUCT_UCRED
 409         setsockopt(s, SOL_SOCKET, SO_PASSCRED, &passcred, sizeof(passcred));
 410 #endif
 411
 412         chmod(sockpath, S_ISGID|S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
 413         return(s);
 414 }
 415
 416
 417
 418 /*
 419  * The following functions implement output buffering on operating systems which
 420  * support it (such as Linux and various BSD flavors).
 421  */
 422 #ifndef HAVE_DARWIN
 423 #ifdef TCP_CORK
 424 #       define HAVE_TCP_BUFFERING
 425 #else
 426 #       ifdef TCP_NOPUSH
 427 #               define HAVE_TCP_BUFFERING
 428 #               define TCP_CORK TCP_NOPUSH
 429 #       endif
 430 #endif /* TCP_CORK */
 431 #endif /* HAVE_DARWIN */
 432
 433 static unsigned on = 1, off = 0;
 434
 435 void buffer_output(void) {
 436 #ifdef HAVE_TCP_BUFFERING
 437 #ifdef HAVE_OPENSSL
 438         if (!CC->redirect_ssl)
 439 #endif
 440                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 441 #endif
 442 }
 443
 444 void unbuffer_output(void) {
 445 #ifdef HAVE_TCP_BUFFERING
 446 #ifdef HAVE_OPENSSL
 447         if (!CC->redirect_ssl)
 448 #endif
 449                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 450 #endif
 451 }
 452
 453 void flush_output(void) {
 454 #ifdef HAVE_TCP_BUFFERING
 455         struct CitContext *CCC = CC;
 456         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 457         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 458 #endif
 459 }
 460
 461 /*
 462 static void flush_client_inbuf(void)
 463 {
 464         CitContext *CCC=CC;
 465
 466         FlushStrBuf(CCC->ReadBuf);
 467         CCC->Pos = NULL;
 468
 469 }
 470 */
 471
 472 /*
 473  * client_write()   ...    Send binary data to the client.
 474  */
 475 int client_write(const char *buf, int nbytes)
 476 {
 477         int bytes_written = 0;
 478         int retval;
 479 #ifndef HAVE_TCP_BUFFERING
 480         int old_buffer_len = 0;
 481 #endif
 482         fd_set wset;
 483         CitContext *Ctx;
 484         int fdflags;
 485
 486         if (nbytes < 1) return(0);
 487
 488 //      flush_client_inbuf();
 489         Ctx = CC;
 490         if (Ctx->redirect_buffer != NULL) {
 491                 StrBufAppendBufPlain(Ctx->redirect_buffer,
 492                                      buf, nbytes, 0);
 493                 return 0;
 494         }
 495
 496 #ifdef HAVE_OPENSSL
 497         if (Ctx->redirect_ssl) {
 498                 client_write_ssl(buf, nbytes);
 499                 return 0;
 500         }
 501 #endif
 502         if (Ctx->client_socket == -1) return -1;
 503
 504         fdflags = fcntl(Ctx->client_socket, F_GETFL);
 505
 506         while ((bytes_written < nbytes) && (Ctx->client_socket != -1)){
 507                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 508                         FD_ZERO(&wset);
 509                         FD_SET(Ctx->client_socket, &wset);
 510                         if (select(1, NULL, &wset, NULL, NULL) == -1) {
 511                                 if (errno == EINTR)
 512                                 {
 513                                         CtdlLogPrintf(CTDL_DEBUG, "client_write(%d bytes) select() interrupted.\n", nbytes-bytes_written);
 514                                         if (CtdlThreadCheckStop()) {
 515                                                 CC->kill_me = 1;
 516                                                 return (-1);
 517                                         } else {
 518                                                 /* can't trust fd's and stuff so we need to re-create them */
 519                                                 continue;
 520                                         }
 521                                 } else {
 522                                         CtdlLogPrintf(CTDL_ERR,
 523                                                 "client_write(%d bytes) select failed: %s (%d)\n",
 524                                                 nbytes - bytes_written,
 525                                                 strerror(errno), errno);
 526                                         cit_backtrace();
 527                                         Ctx->kill_me = 1;
 528                                         return -1;
 529                                 }
 530                         }
 531                 }
 532
 533                 retval = write(Ctx->client_socket, &buf[bytes_written],
 534                         nbytes - bytes_written);
 535                 if (retval < 1) {
 536                         CtdlLogPrintf(CTDL_ERR,
 537                                 "client_write(%d bytes) failed: %s (%d)\n",
 538                                 nbytes - bytes_written,
 539                                 strerror(errno), errno);
 540                         cit_backtrace();
 541                         // CtdlLogPrintf(CTDL_DEBUG, "Tried to send: %s",  &buf[bytes_written]);
 542                         Ctx->kill_me = 1;
 543                         return -1;
 544                 }
 545                 bytes_written = bytes_written + retval;
 546         }
 547         return 0;
 548 }
 549
 550 void cputbuf(const StrBuf *Buf) {
 551         client_write(ChrPtr(Buf), StrLength(Buf));
 552 }
 553
 554
 555 /*
 556  * cprintf()    Send formatted printable data to the client.
 557  *              Implemented in terms of client_write() so it's technically not sysdep...
 558  */
 559 void cprintf(const char *format, ...) {
 560         va_list arg_ptr;
 561         char buf[1024];
 562
 563         va_start(arg_ptr, format);
 564         if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
 565                 buf[sizeof buf - 2] = '\n';
 566         client_write(buf, strlen(buf));
 567         va_end(arg_ptr);
 568 }
 569
 570
 571 /*
 572  * Read data from the client socket.
 573  *
 574  * sock         socket fd to read from
 575  * buf          buffer to read into
 576  * bytes        number of bytes to read
 577  * timeout      Number of seconds to wait before timing out
 578  *
 579  * Possible return values:
 580  *      1       Requested number of bytes has been read.
 581  *      0       Request timed out.
 582  *      -1      Connection is broken, or other error.
 583  */
 584 int client_read_blob(StrBuf *Target, int bytes, int timeout)
 585 {
 586         CitContext *CCC=CC;
 587         const char *Error;
 588         int retval = 0;
 589
 590 #ifdef HAVE_OPENSSL
 591         if (CCC->redirect_ssl) {
 592                 retval = client_read_sslblob(Target, bytes, timeout);
 593                 if (retval < 0) {
 594                         CtdlLogPrintf(CTDL_CRIT,
 595                                       "%s failed\n",
 596                                       __FUNCTION__);
 597                 }
 598         }
 599         else
 600 #endif
 601         {
 602                 retval = StrBufReadBLOBBuffered(Target,
 603                                                 CCC->ReadBuf,
 604                                                 &CCC->Pos,
 605                                                 &CCC->client_socket,
 606                                                 1,
 607                                                 bytes,
 608                                                 O_TERM,
 609                                                 &Error);
 610                 if (retval < 0) {
 611                         CtdlLogPrintf(CTDL_CRIT,
 612                                       "%s failed: %s\n",
 613                                       __FUNCTION__,
 614                                       Error);
 615                         return retval;
 616                 }
 617                 else
 618                 {
 619 #ifdef BIGBAD_IODBG
 620                         int rv = 0;
 621                         char fn [SIZ];
 622                         FILE *fd;
 623
 624                         snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 625
 626                         fd = fopen(fn, "a+");
 627                         fprintf(fd, "Read: BufSize: %d BufContent: [",
 628                                 StrLength(Target));
 629                         rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 630                         fprintf(fd, "]\n");
 631
 632
 633                         fclose(fd);
 634 #endif
 635
 636                 }
 637         }
 638         return retval;
 639 }
 640
 641
 642 /*
 643  * to make client_read_random_blob() more efficient, increase buffer size.
 644  * just use in greeting function, else your buffer may be flushed
 645  */
 646 void client_set_inbound_buf(long N)
 647 {
 648         FlushStrBuf(CC->ReadBuf);
 649         ReAdjustEmptyBuf(CC->ReadBuf, N * SIZ, N * SIZ);
 650 }
 651
 652 int client_read_random_blob(StrBuf *Target, int timeout)
 653 {
 654         CitContext *CCC=CC;
 655         int rc;
 656
 657         rc =  client_read_blob(Target, 1, timeout);
 658         if (rc > 0)
 659         {
 660                 long len;
 661                 const char *pch;
 662
 663                 len = StrLength(CCC->ReadBuf);
 664                 pch = ChrPtr(CCC->ReadBuf);
 665
 666                 if (len > 0)
 667                 {
 668                         if (CCC->Pos != NULL) {
 669                                 len -= CCC->Pos - pch;
 670                                 pch = CCC->Pos;
 671                         }
 672                         StrBufAppendBufPlain(Target, pch, len, 0);
 673                         FlushStrBuf(CCC->ReadBuf);
 674                         CCC->Pos = NULL;
 675 #ifdef BIGBAD_IODBG
 676                         {
 677                                 int rv = 0;
 678                                 char fn [SIZ];
 679                                 FILE *fd;
 680
 681                                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 682
 683                                 fd = fopen(fn, "a+");
 684                                 fprintf(fd, "Read: BufSize: %d BufContent: [",
 685                                         StrLength(Target));
 686                                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 687                                 fprintf(fd, "]\n");
 688
 689
 690                                 fclose(fd);
 691                         }
 692 #endif
 693
 694                         return StrLength(Target);
 695                 }
 696                 return rc;
 697         }
 698         else
 699                 return rc;
 700 }
 701
 702 int client_read_to(char *buf, int bytes, int timeout)
 703 {
 704         CitContext *CCC=CC;
 705         int rc;
 706
 707         rc = client_read_blob(CCC->MigrateBuf, bytes, timeout);
 708         if (rc < 0)
 709         {
 710                 *buf = '\0';
 711                 return rc;
 712         }
 713         else
 714         {
 715                 memcpy(buf,
 716                        ChrPtr(CCC->MigrateBuf),
 717                        StrLength(CCC->MigrateBuf) + 1);
 718                 FlushStrBuf(CCC->MigrateBuf);
 719                 return rc;
 720         }
 721 }
 722
 723
 724 int HaveMoreLinesWaiting(CitContext *CCC)
 725 {
 726         if ((CCC->kill_me == 1) || (
 727             (CCC->Pos == NULL) &&
 728             (StrLength(CCC->ReadBuf) == 0) &&
 729             (CCC->client_socket != -1)) )
 730                 return 0;
 731         else
 732                 return 1;
 733 }
 734
 735
 736 /*
 737  * Read data from the client socket with default timeout.
 738  * (This is implemented in terms of client_read_to() and could be
 739  * justifiably moved out of sysdep.c)
 740  */
 741 INLINE int client_read(char *buf, int bytes)
 742 {
 743         return(client_read_to(buf, bytes, config.c_sleeping));
 744 }
 745
 746 int CtdlClientGetLine(StrBuf *Target)
 747 {
 748         CitContext *CCC=CC;
 749         const char *Error;
 750         int rc;
 751
 752         FlushStrBuf(Target);
 753 #ifdef HAVE_OPENSSL
 754         if (CCC->redirect_ssl) {
 755 #ifdef BIGBAD_IODBG
 756                 char fn [SIZ];
 757                 FILE *fd;
 758                 int len = 0;
 759                 int rlen = 0;
 760                 int  nlen = 0;
 761                 int nrlen = 0;
 762                 const char *pch;
 763
 764                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 765
 766                 fd = fopen(fn, "a+");
 767                 pch = ChrPtr(CCC->ReadBuf);
 768                 len = StrLength(CCC->ReadBuf);
 769                 if (CCC->Pos != NULL)
 770                         rlen = CC->Pos - pch;
 771                 else
 772                         rlen = 0;
 773
 774 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 775                         len, rlen, pch);
 776 */
 777                 fprintf(fd, "\n\n\nSSL1: BufSize: %d BufPos: %d \n_____________________\n",
 778                         len, rlen);
 779 #endif
 780                 rc = client_readline_sslbuffer(Target,
 781                                                CCC->ReadBuf,
 782                                                &CCC->Pos,
 783                                                1);
 784 #ifdef BIGBAD_IODBG
 785                 pch = ChrPtr(CCC->ReadBuf);
 786                 nlen = StrLength(CCC->ReadBuf);
 787                 if (CCC->Pos != NULL)
 788                         nrlen = CC->Pos - pch;
 789                 else
 790                         nrlen = 0;
 791 /*
 792                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 793                         len, nlen, rlen, nrlen, pch);
 794 */
 795                 fprintf(fd, "\n\n\nSSL2: BufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 796                         len, nlen, rlen, nrlen);
 797
 798                 fprintf(fd, "SSL3: Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 799                         StrLength(Target), ChrPtr(Target));
 800                 fclose(fd);
 801
 802                 if (rc < 0)
 803                         CtdlLogPrintf(CTDL_CRIT,
 804                                       "%s failed\n",
 805                                       __FUNCTION__);
 806 #endif
 807                 return rc;
 808         }
 809         else
 810 #endif
 811         {
 812 #ifdef BIGBAD_IODBG
 813                 char fn [SIZ];
 814                 FILE *fd;
 815                 int len, rlen, nlen, nrlen;
 816                 const char *pch;
 817
 818                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 819
 820                 fd = fopen(fn, "a+");
 821                 pch = ChrPtr(CCC->ReadBuf);
 822                 len = StrLength(CCC->ReadBuf);
 823                 if (CCC->Pos != NULL)
 824                         rlen = CC->Pos - pch;
 825                 else
 826                         rlen = 0;
 827
 828 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 829                         len, rlen, pch);
 830 */
 831                 fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \n_____________________\n",
 832                         len, rlen);
 833 #endif
 834                 rc = StrBufTCP_read_buffered_line_fast(Target,
 835                                                        CCC->ReadBuf,
 836                                                        &CCC->Pos,
 837                                                        &CCC->client_socket,
 838                                                        5,
 839                                                        1,
 840                                                        &Error);
 841
 842 #ifdef BIGBAD_IODBG
 843                 pch = ChrPtr(CCC->ReadBuf);
 844                 nlen = StrLength(CCC->ReadBuf);
 845                 if (CCC->Pos != NULL)
 846                         nrlen = CC->Pos - pch;
 847                 else
 848                         nrlen = 0;
 849 /*
 850                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 851                         len, nlen, rlen, nrlen, pch);
 852 */
 853                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 854                         len, nlen, rlen, nrlen);
 855
 856                 fprintf(fd, "Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 857                         StrLength(Target), ChrPtr(Target));
 858                 fclose(fd);
 859
 860                 if ((rc < 0) && (Error != NULL))
 861                         CtdlLogPrintf(CTDL_CRIT,
 862                                       "%s failed: %s\n",
 863                                       __FUNCTION__,
 864                                       Error);
 865 #endif
 866                 return rc;
 867         }
 868 }
 869
 870
 871 /*
 872  * client_getln()   ...   Get a LF-terminated line of text from the client.
 873  * (This is implemented in terms of client_read() and could be
 874  * justifiably moved out of sysdep.c)
 875  */
 876 int client_getln(char *buf, int bufsize)
 877 {
 878         int i, retval;
 879         CitContext *CCC=CC;
 880         const char *pCh;
 881
 882         retval = CtdlClientGetLine(CCC->MigrateBuf);
 883         if (retval < 0)
 884           return(retval >= 0);
 885
 886
 887         i = StrLength(CCC->MigrateBuf);
 888         pCh = ChrPtr(CCC->MigrateBuf);
 889         /* Strip the trailing LF, and the trailing CR if present.
 890          */
 891         if (bufsize <= i)
 892                 i = bufsize - 1;
 893         while ( (i > 0)
 894                 && ( (pCh[i - 1]==13)
 895                      || ( pCh[i - 1]==10)) ) {
 896                 i--;
 897         }
 898         memcpy(buf, pCh, i);
 899         buf[i] = 0;
 900
 901         FlushStrBuf(CCC->MigrateBuf);
 902         if (retval < 0) {
 903                 safestrncpy(&buf[i], "000", bufsize - i);
 904         }
 905         return(retval >= 0);
 906 }
 907
 908
 909 /*
 910  * Cleanup any contexts that are left lying around
 911  */
 912
 913
 914 void close_masters (void)
 915 {
 916         struct ServiceFunctionHook *serviceptr;
 917
 918         /*
 919          * close all protocol master sockets
 920          */
 921         for (serviceptr = ServiceHookTable; serviceptr != NULL;
 922             serviceptr = serviceptr->next ) {
 923
 924                 if (serviceptr->tcp_port > 0)
 925                 {
 926                         CtdlLogPrintf(CTDL_INFO, "Closing listener on port %d\n",
 927                                 serviceptr->tcp_port);
 928                         serviceptr->tcp_port = 0;
 929                 }
 930
 931                 if (serviceptr->sockpath != NULL)
 932                         CtdlLogPrintf(CTDL_INFO, "Closing listener on '%s'\n",
 933                                 serviceptr->sockpath);
 934
 935                 close(serviceptr->msock);
 936                 /* If it's a Unix domain socket, remove the file. */
 937                 if (serviceptr->sockpath != NULL) {
 938                         unlink(serviceptr->sockpath);
 939                         serviceptr->sockpath = NULL;
 940                 }
 941         }
 942 }
 943
 944
 945 /*
 946  * The system-dependent part of master_cleanup() - close the master socket.
 947  */
 948 void sysdep_master_cleanup(void) {
 949
 950         close_masters();
 951
 952         context_cleanup();
 953
 954 #ifdef HAVE_OPENSSL
 955         destruct_ssl();
 956 #endif
 957         CtdlDestroyProtoHooks();
 958         CtdlDestroyDeleteHooks();
 959         CtdlDestroyXmsgHooks();
 960         CtdlDestroyNetprocHooks();
 961         CtdlDestroyUserHooks();
 962         CtdlDestroyMessageHook();
 963         CtdlDestroyCleanupHooks();
 964         CtdlDestroyFixedOutputHooks();
 965         CtdlDestroySessionHooks();
 966         CtdlDestroyServiceHook();
 967         CtdlDestroyRoomHooks();
 968         #ifdef HAVE_BACKTRACE
 969 ///     eCrash_Uninit();
 970         #endif
 971 }
 972
 973
 974
 975 pid_t current_child;
 976 void graceful_shutdown(int signum) {
 977         kill(current_child, signum);
 978         unlink(file_pid_file);
 979         exit(0);
 980 }
 981
 982 int nFireUps = 0;
 983 int nFireUpsNonRestart = 0;
 984 pid_t ForkedPid = 1;
 985
 986 /*
 987  * Start running as a daemon.
 988  */
 989 void start_daemon(int unused) {
 990         int status = 0;
 991         pid_t child = 0;
 992         FILE *fp;
 993         int do_restart = 0;
 994
 995         current_child = 0;
 996
 997         /* Close stdin/stdout/stderr and replace them with /dev/null.
 998          * We don't just call close() because we don't want these fd's
 999          * to be reused for other files.
1000          */
1001         if (chdir(ctdl_run_dir) != 0)
1002                 CtdlLogPrintf(CTDL_EMERG,
1003                               "unable to change into directory [%s]: %s",
1004                               ctdl_run_dir, strerror(errno));
1005
1006         child = fork();
1007         if (child != 0) {
1008                 exit(0);
1009         }
1010
1011         signal(SIGHUP, SIG_IGN);
1012         signal(SIGINT, SIG_IGN);
1013         signal(SIGQUIT, SIG_IGN);
1014
1015         setsid();
1016         umask(0);
1017         if ((freopen("/dev/null", "r", stdin) != stdin) ||
1018             (freopen("/dev/null", "w", stdout) != stdout) ||
1019             (freopen("/dev/null", "w", stderr) != stderr))
1020                 CtdlLogPrintf(CTDL_EMERG,
1021                               "unable to reopen stdin/out/err %s",
1022                               strerror(errno));
1023
1024
1025         do {
1026                 current_child = fork();
1027
1028                 signal(SIGTERM, graceful_shutdown);
1029
1030                 if (current_child < 0) {
1031                         perror("fork");
1032                         exit(errno);
1033                 }
1034
1035                 else if (current_child == 0) {
1036                         return; /* continue starting citadel. */
1037                 }
1038
1039                 else {
1040                         fp = fopen(file_pid_file, "w");
1041                         if (fp != NULL) {
1042                                 fprintf(fp, ""F_PID_T"\n", getpid());
1043                                 fclose(fp);
1044                         }
1045                         waitpid(current_child, &status, 0);
1046                 }
1047                 do_restart = 0;
1048                 nFireUpsNonRestart = nFireUps;
1049
1050                 /* Exit code 0 means the watcher should exit */
1051                 if (WIFEXITED(status) && (WEXITSTATUS(status) == CTDLEXIT_SHUTDOWN)) {
1052                         do_restart = 0;
1053                 }
1054
1055                 /* Exit code 101-109 means the watcher should exit */
1056                 else if (WIFEXITED(status) && (WEXITSTATUS(status) >= 101) && (WEXITSTATUS(status) <= 109)) {
1057                         do_restart = 0;
1058                 }
1059
1060                 /* Any other exit code, or no exit code, means we should restart. */
1061                 else {
1062                         do_restart = 1;
1063                         nFireUps++;
1064                         ForkedPid = current_child;
1065                 }
1066
1067         } while (do_restart);
1068
1069         unlink(file_pid_file);
1070         exit(WEXITSTATUS(status));
1071 }
1072
1073
1074
1075 void checkcrash(void)
1076 {
1077         if (nFireUpsNonRestart != nFireUps)
1078         {
1079                 StrBuf *CrashMail;
1080
1081                 CrashMail = NewStrBuf();
1082                 CtdlLogPrintf(CTDL_ALERT, "Posting crash message\n");
1083                 StrBufPrintf(CrashMail,
1084                         " \n"
1085                         " The Citadel server process (citserver) terminated unexpectedly."
1086                         "\n \n"
1087                         " This could be the result of a bug in the server program, or some external "
1088                         "factor.\n \n"
1089                         " You can obtain more information about this by enabling core dumps.\n \n"
1090                         " For more information, please see:\n \n"
1091                         " http://citadel.org/doku.php/faq:mastering_your_os:gdb#how.do.i.make.my.system.produce.core-files"
1092                         "\n \n"
1093
1094                         " If you have already done this, the core dump is likely to be found at %score.%d\n"
1095                         ,
1096                         ctdl_run_dir, ForkedPid);
1097                 CtdlAideMessage(ChrPtr(CrashMail), "Citadel server process terminated unexpectedly");
1098                 FreeStrBuf(&CrashMail);
1099         }
1100 }
1101
1102
1103 /*
1104  * Generic routine to convert a login name to a full name (gecos)
1105  * Returns nonzero if a conversion took place
1106  */
1107 int convert_login(char NameToConvert[]) {
1108         struct passwd *pw;
1109         int a;
1110
1111         pw = getpwnam(NameToConvert);
1112         if (pw == NULL) {
1113                 return(0);
1114         }
1115         else {
1116                 strcpy(NameToConvert, pw->pw_gecos);
1117                 for (a=0; a<strlen(NameToConvert); ++a) {
1118                         if (NameToConvert[a] == ',') NameToConvert[a] = 0;
1119                 }
1120                 return(1);
1121         }
1122 }
1123
1124
1125
1126 /*
1127  * This loop just keeps going and going and going...
1128  */
1129 /*
1130  * FIXME:
1131  * This current implimentation of worker_thread creates a bottle neck in several situations
1132  * The first thing to remember is that a single thread can handle more than one connection at a time.
1133  * More threads mean less memory for the system to run in.
1134  * So for efficiency we want every thread to be doing something useful or waiting in the main loop for
1135  * something to happen anywhere.
1136  * This current implimentation requires worker threads to wait in other locations, after it has
1137  * been committed to a single connection which is very wasteful.
1138  * As an extreme case consider this:
1139  * A slow client connects and this slow client sends only one character each second.
1140  * With this current implimentation a single worker thread is dispatched to handle that connection
1141  * until such times as the client timeout expires, an error occurs on the socket or the client
1142  * completes its transmission.
1143  * THIS IS VERY BAD since that thread could have handled a read from many more clients in each one
1144  * second interval between chars.
1145  *
1146  * It is my intention to re-write this code and the associated client_getln, client_read functions
1147  * to allow any thread to read data on behalf of any connection (context).
1148  * To do this I intend to have this main loop read chars into a buffer stored in the context.
1149  * Once the correct criteria for a full buffer is met then we will dispatch a thread to
1150  * process it.
1151  * This worker thread loop also needs to be able to handle binary data.
1152  */
1153
1154 void *worker_thread(void *arg) {
1155         int highest;
1156         CitContext *ptr;
1157         CitContext *bind_me = NULL;
1158         fd_set readfds;
1159         int retval = 0;
1160         struct timeval tv;
1161         int force_purge = 0;
1162
1163
1164         while (!CtdlThreadCheckStop()) {
1165
1166                 /* make doubly sure we're not holding any stale db handles
1167                  * which might cause a deadlock.
1168                  */
1169                 cdb_check_handles();
1170 do_select:      force_purge = 0;
1171                 bind_me = NULL;         /* Which session shall we handle? */
1172
1173                 /* Initialize the fdset. */
1174                 FD_ZERO(&readfds);
1175                 highest = 0;
1176
1177                 begin_critical_section(S_SESSION_TABLE);
1178                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1179                         int client_socket;
1180                         client_socket = ptr->client_socket;
1181                         /* Dont select on dead sessions only truly idle ones */
1182                         if ((ptr->state == CON_IDLE) &&
1183                             (CC->kill_me == 0) &&
1184                             (client_socket != -1))
1185                         {
1186                                 FD_SET(client_socket, &readfds);
1187                                 if (client_socket > highest)
1188                                         highest = client_socket;
1189                         }
1190                         if ((bind_me == NULL) && (ptr->state == CON_READY)) {
1191                                 bind_me = ptr;
1192                                 ptr->state = CON_EXECUTING;
1193                                 break;
1194                         }
1195                         if ((bind_me == NULL) && (ptr->state == CON_GREETING)) {
1196                                 bind_me = ptr;
1197                                 ptr->state = CON_STARTING;
1198                                 break;
1199                         }
1200                 }
1201                 end_critical_section(S_SESSION_TABLE);
1202
1203                 if (bind_me) {
1204                         goto SKIP_SELECT;
1205                 }
1206
1207                 /* If we got this far, it means that there are no sessions
1208                  * which a previous thread marked for attention, so we go
1209                  * ahead and get ready to select().
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                                 continue;
1233                         } else {
1234                                 CtdlLogPrintf(CTDL_DEBUG, "Interrupted CtdlThreadSelect.\n");
1235                                 if (CtdlThreadCheckStop()) return(NULL);
1236                                 goto do_select;
1237                         }
1238                 }
1239                 else if(retval == 0) {
1240                         if (CtdlThreadCheckStop()) return(NULL);
1241                 }
1242
1243                 /* It must be a client socket.  Find a context that has data
1244                  * waiting on its socket *and* is in the CON_IDLE state.  Any
1245                  * active sockets other than our chosen one are marked as
1246                  * CON_READY so the next thread that comes around can just bind
1247                  * to one without having to select() again.
1248                  */
1249                 begin_critical_section(S_SESSION_TABLE);
1250                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1251                         int checkfd = ptr->client_socket;
1252                         if ((checkfd != -1) && (ptr->state == CON_IDLE) ){
1253                                 if (FD_ISSET(checkfd, &readfds)) {
1254                                         ptr->input_waiting = 1;
1255                                         if (!bind_me) {
1256                                                 bind_me = ptr;  /* I choose you! */
1257                                                 bind_me->state = CON_EXECUTING;
1258                                         }
1259                                         else {
1260                                                 ptr->state = CON_READY;
1261                                         }
1262                                 } else if ((ptr->is_async) && (ptr->async_waiting) && (ptr->h_async_function)) {
1263                                         if (!bind_me) {
1264                                                 bind_me = ptr;  /* I choose you! */
1265                                                 bind_me->state = CON_EXECUTING;
1266                                         }
1267                                         else {
1268                                                 ptr->state = CON_READY;
1269                                         }
1270                                 }
1271                         }
1272                 }
1273                 end_critical_section(S_SESSION_TABLE);
1274
1275 SKIP_SELECT:
1276                 /* We're bound to a session */
1277                 if (bind_me != NULL) {
1278                         become_session(bind_me);
1279
1280                         if (bind_me->state == CON_STARTING) {
1281                                 bind_me->state = CON_EXECUTING;
1282                                 begin_session(bind_me);
1283                                 bind_me->h_greeting_function();
1284                         }
1285                         /* If the client has sent a command, execute it. */
1286                         if (CC->input_waiting) {
1287                                 CC->h_command_function();
1288
1289                                 while (HaveMoreLinesWaiting(CC))
1290                                        CC->h_command_function();
1291
1292                                 CC->input_waiting = 0;
1293                         }
1294
1295                         /* If there are asynchronous messages waiting and the
1296                          * client supports it, do those now */
1297                         if ((CC->is_async) && (CC->async_waiting)
1298                            && (CC->h_async_function != NULL)) {
1299                                 CC->h_async_function();
1300                                 CC->async_waiting = 0;
1301                         }
1302
1303                         force_purge = CC->kill_me;
1304                         become_session(NULL);
1305                         bind_me->state = CON_IDLE;
1306                 }
1307
1308                 dead_session_purge(force_purge);
1309                 do_housekeeping();
1310         }
1311         /* If control reaches this point, the server is shutting down */
1312         return(NULL);
1313 }
1314
1315
1316
1317
1318 /*
1319  * A function to handle selecting on master sockets.
1320  * In other words it handles new connections.
1321  * It is a thread.
1322  */
1323 void *select_on_master (void *arg)
1324 {
1325         struct ServiceFunctionHook *serviceptr;
1326         fd_set master_fds;
1327         int highest;
1328         struct timeval tv;
1329         int ssock;                      /* Descriptor for client socket */
1330         CitContext *con= NULL;  /* Temporary context pointer */
1331         int m;
1332         int i;
1333         int retval;
1334         struct CitContext select_on_master_CC;
1335
1336         CtdlFillSystemContext(&select_on_master_CC, "select_on_master");
1337         citthread_setspecific(MyConKey, (void *)&select_on_master_CC);
1338
1339         while (!CtdlThreadCheckStop()) {
1340                 /* Initialize the fdset. */
1341                 FD_ZERO(&master_fds);
1342                 highest = 0;
1343
1344                 /* First, add the various master sockets to the fdset. */
1345                 for (serviceptr = ServiceHookTable; serviceptr != NULL;
1346                 serviceptr = serviceptr->next ) {
1347                         m = serviceptr->msock;
1348                         FD_SET(m, &master_fds);
1349                         if (m > highest) {
1350                                 highest = m;
1351                         }
1352                 }
1353
1354                 if (!CtdlThreadCheckStop()) {
1355                         tv.tv_sec = 60;         /* wake up every second if no input */
1356                         tv.tv_usec = 0;
1357                         retval = CtdlThreadSelect(highest + 1, &master_fds, NULL, NULL, &tv);
1358                 }
1359                 else
1360                         return NULL;
1361
1362                 /* Now figure out who made this select() unblock.
1363                  * First, check for an error or exit condition.
1364                  */
1365                 if (retval < 0) {
1366                         if (errno == EBADF) {
1367                                 CtdlLogPrintf(CTDL_NOTICE, "select() failed: (%s)\n",
1368                                         strerror(errno));
1369                                 continue;
1370                         }
1371                         if (errno != EINTR) {
1372                                 CtdlLogPrintf(CTDL_EMERG, "Exiting (%s)\n", strerror(errno));
1373                                 CtdlThreadStopAll();
1374                         } else {
1375                                 CtdlLogPrintf(CTDL_DEBUG, "Interrupted CtdlThreadSelect.\n");
1376                                 if (CtdlThreadCheckStop()) return(NULL);
1377                                 continue;
1378                         }
1379                 }
1380                 else if(retval == 0) {
1381                         if (CtdlThreadCheckStop()) return(NULL);
1382                         continue;
1383                 }
1384                 /* Next, check to see if it's a new client connecting
1385                  * on a master socket.
1386                  */
1387                 else for (serviceptr = ServiceHookTable; serviceptr != NULL;
1388                      serviceptr = serviceptr->next ) {
1389
1390                         if (FD_ISSET(serviceptr->msock, &master_fds)) {
1391                                 ssock = accept(serviceptr->msock, NULL, 0);
1392                                 if (ssock >= 0) {
1393                                         CtdlLogPrintf(CTDL_DEBUG,
1394                                                 "New client socket %d\n",
1395                                                 ssock);
1396
1397                                         /* The master socket is non-blocking but the client
1398                                          * sockets need to be blocking, otherwise certain
1399                                          * operations barf on FreeBSD.  Not a fatal error.
1400                                          */
1401                                         if (fcntl(ssock, F_SETFL, 0) < 0) {
1402                                                 CtdlLogPrintf(CTDL_EMERG,
1403                                                         "citserver: Can't set socket to blocking: %s\n",
1404                                                         strerror(errno));
1405                                         }
1406
1407                                         /* New context will be created already
1408                                          * set up in the CON_EXECUTING state.
1409                                          */
1410                                         con = CreateNewContext();
1411
1412                                         /* Assign our new socket number to it. */
1413                                         con->client_socket = ssock;
1414                                         con->h_command_function =
1415                                                 serviceptr->h_command_function;
1416                                         con->h_async_function =
1417                                                 serviceptr->h_async_function;
1418                                         con->h_greeting_function = serviceptr->h_greeting_function;
1419                                         con->ServiceName =
1420                                                 serviceptr->ServiceName;
1421
1422                                         /* Determine whether it's a local socket */
1423                                         if (serviceptr->sockpath != NULL)
1424                                                 con->is_local_socket = 1;
1425
1426                                         /* Set the SO_REUSEADDR socket option */
1427                                         i = 1;
1428                                         setsockopt(ssock, SOL_SOCKET,
1429                                                 SO_REUSEADDR,
1430                                                 &i, sizeof(i));
1431
1432                                         con->state = CON_GREETING;
1433
1434                                         retval--;
1435                                         if (retval == 0)
1436                                                 break;
1437                                 }
1438                         }
1439                 }
1440         }
1441         CtdlClearSystemContext();
1442
1443         return NULL;
1444 }
1445
1446
1447
1448 /*
1449  * SyslogFacility()
1450  * Translate text facility name to syslog.h defined value.
1451  */
1452 int SyslogFacility(char *name)
1453 {
1454         int i;
1455         struct
1456         {
1457                 int facility;
1458                 char *name;
1459         }   facTbl[] =
1460         {
1461                 {   LOG_KERN,   "kern"          },
1462                 {   LOG_USER,   "user"          },
1463                 {   LOG_MAIL,   "mail"          },
1464                 {   LOG_DAEMON, "daemon"        },
1465                 {   LOG_AUTH,   "auth"          },
1466                 {   LOG_SYSLOG, "syslog"        },
1467                 {   LOG_LPR,    "lpr"           },
1468                 {   LOG_NEWS,   "news"          },
1469                 {   LOG_UUCP,   "uucp"          },
1470                 {   LOG_LOCAL0, "local0"        },
1471                 {   LOG_LOCAL1, "local1"        },
1472                 {   LOG_LOCAL2, "local2"        },
1473                 {   LOG_LOCAL3, "local3"        },
1474                 {   LOG_LOCAL4, "local4"        },
1475                 {   LOG_LOCAL5, "local5"        },
1476                 {   LOG_LOCAL6, "local6"        },
1477                 {   LOG_LOCAL7, "local7"        },
1478                 {   0,            NULL          }
1479         };
1480         for(i = 0; facTbl[i].name != NULL; i++) {
1481                 if(!strcasecmp(name, facTbl[i].name))
1482                         return facTbl[i].facility;
1483         }
1484         enable_syslog = 0;
1485         return LOG_DAEMON;
1486 }
1487
1488
1489 /********** MEM CHEQQER ***********/
1490
1491 #ifdef DEBUG_MEMORY_LEAKS
1492
1493 #undef malloc
1494 #undef realloc
1495 #undef strdup
1496 #undef free
1497
1498 void *tracked_malloc(size_t size, char *file, int line) {
1499         struct igheap *thisheap;
1500         void *block;
1501
1502         block = malloc(size);
1503         if (block == NULL) return(block);
1504
1505         thisheap = malloc(sizeof(struct igheap));
1506         if (thisheap == NULL) {
1507                 free(block);
1508                 return(NULL);
1509         }
1510
1511         thisheap->block = block;
1512         strcpy(thisheap->file, file);
1513         thisheap->line = line;
1514
1515         begin_critical_section(S_DEBUGMEMLEAKS);
1516         thisheap->next = igheap;
1517         igheap = thisheap;
1518         end_critical_section(S_DEBUGMEMLEAKS);
1519
1520         return(block);
1521 }
1522
1523
1524 void *tracked_realloc(void *ptr, size_t size, char *file, int line) {
1525         struct igheap *thisheap;
1526         void *block;
1527
1528         block = realloc(ptr, size);
1529         if (block == NULL) return(block);
1530
1531         thisheap = malloc(sizeof(struct igheap));
1532         if (thisheap == NULL) {
1533                 free(block);
1534                 return(NULL);
1535         }
1536
1537         thisheap->block = block;
1538         strcpy(thisheap->file, file);
1539         thisheap->line = line;
1540
1541         begin_critical_section(S_DEBUGMEMLEAKS);
1542         thisheap->next = igheap;
1543         igheap = thisheap;
1544         end_critical_section(S_DEBUGMEMLEAKS);
1545
1546         return(block);
1547 }
1548
1549
1550
1551 void tracked_free(void *ptr) {
1552         struct igheap *thisheap;
1553         struct igheap *trash;
1554
1555         free(ptr);
1556
1557         if (igheap == NULL) return;
1558         begin_critical_section(S_DEBUGMEMLEAKS);
1559         for (thisheap = igheap; thisheap != NULL; thisheap = thisheap->next) {
1560                 if (thisheap->next != NULL) {
1561                         if (thisheap->next->block == ptr) {
1562                                 trash = thisheap->next;
1563                                 thisheap->next = thisheap->next->next;
1564                                 free(trash);
1565                         }
1566                 }
1567         }
1568         if (igheap->block == ptr) {
1569                 trash = igheap;
1570                 igheap = igheap->next;
1571                 free(trash);
1572         }
1573         end_critical_section(S_DEBUGMEMLEAKS);
1574 }
1575
1576 char *tracked_strdup(const char *s, char *file, int line) {
1577         char *ptr;
1578
1579         if (s == NULL) return(NULL);
1580         ptr = tracked_malloc(strlen(s) + 1, file, line);
1581         if (ptr == NULL) return(NULL);
1582         strncpy(ptr, s, strlen(s));
1583         return(ptr);
1584 }
1585
1586 void dump_heap(void) {
1587         struct igheap *thisheap;
1588
1589         for (thisheap = igheap; thisheap != NULL; thisheap = thisheap->next) {
1590                 CtdlLogPrintf(CTDL_CRIT, "UNFREED: %30s : %d\n",
1591                         thisheap->file, thisheap->line);
1592         }
1593 }
1594
1595 #endif /*  DEBUG_MEMORY_LEAKS */