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
  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 || running_as_daemon) 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                 StrBuf *lBuf;
 124                 CitContext *CCC = CC;
 125                 ThreadTSD *cTSD = CTP;
 126                 CtdlThreadNode *node = NULL;
 127                 long lwpid = 0;
 128
 129                 if (cTSD != NULL)
 130                         node = cTSD->self;
 131                 if ((node != NULL) && (node->reltid != 0))
 132                 {
 133                         lwpid = node->reltid;
 134                 }
 135
 136                 gettimeofday(&tv, NULL);
 137                 /* Promote to time_t; types differ on some OSes (like darwin) */
 138                 unixtime = tv.tv_sec;
 139                 localtime_r(&unixtime, &tim);
 140
 141                 if ((CCC != NULL) && (CCC != &masterCC))
 142                         lBuf = CCC->lBuf;
 143                 else
 144                         lBuf = NewStrBuf();
 145                 if (lBuf == NULL) {
 146                         char buf[SIZ], buf2[SIZ];
 147
 148                         if ((CCC != NULL) && (CCC->cs_pid != 0)) {
 149                                 sprintf(buf,
 150                                         "%04d/%02d/%02d %2d:%02d:%02d.%06ld xx [%3d] ",
 151                                         tim.tm_year + 1900, tim.tm_mon + 1,
 152                                         tim.tm_mday, tim.tm_hour, tim.tm_min,
 153                                         tim.tm_sec, (long)tv.tv_usec,
 154                                         CCC->cs_pid);
 155                         } else {
 156                                 sprintf(buf,
 157                                         "%04d/%02d/%02d %2d:%02d:%02d.%06ld xx ",
 158                                         tim.tm_year + 1900, tim.tm_mon + 1,
 159                                         tim.tm_mday, tim.tm_hour, tim.tm_min,
 160                                         tim.tm_sec, (long)tv.tv_usec);
 161                         }
 162                         vsnprintf(buf2, SIZ, format, arg_ptr);
 163
 164                         fprintf(stderr, ":%s%s", buf, buf2);
 165                 }
 166                 else {
 167                         StrBufPrintf(lBuf,
 168                                      "%04d/%02d/%02d %2d:%02d:%02d.%06ld ",
 169                                      tim.tm_year + 1900, tim.tm_mon + 1,
 170                                      tim.tm_mday, tim.tm_hour, tim.tm_min,
 171                                      tim.tm_sec, (long)tv.tv_usec);
 172
 173
 174                         if (lwpid != 0)
 175                                 StrBufAppendPrintf(lBuf,
 176                                                    "[LWP:%d] ",
 177                                                    lwpid);
 178
 179                         if (CCC != NULL) {
 180                                 if (CCC->cs_pid != 0)
 181                                         StrBufAppendPrintf(lBuf,
 182                                                            "[%3d] ",
 183                                                            CCC->cs_pid);
 184                                 else if (CCC->user.usernum != 0)
 185                                         StrBufAppendPrintf(lBuf,
 186                                                            "[:%d] ",
 187                                                            CCC->user.usernum);
 188                         }
 189                         StrBufVAppendPrintf(lBuf, format, arg_ptr);
 190                         fwrite(ChrPtr(lBuf), 1, StrLength(lBuf), stderr);
 191                 }
 192                 fflush(stderr);
 193                 if (CCC == NULL) FreeStrBuf(&lBuf);
 194
 195         }
 196 }
 197
 198
 199
 200 /*
 201  * Signal handler to shut down the server.
 202  */
 203
 204 volatile int exit_signal = 0;
 205 volatile int shutdown_and_halt = 0;
 206 volatile int restart_server = 0;
 207 volatile int running_as_daemon = 0;
 208
 209 static RETSIGTYPE signal_cleanup(int signum) {
 210
 211         if (CT)
 212                 CT->signal = signum;
 213         else
 214         {
 215                 CtdlLogPrintf(CTDL_DEBUG, "Caught signal %d; shutting down.\n", signum);
 216                 exit_signal = signum;
 217         }
 218 }
 219
 220 static RETSIGTYPE signal_exit(int signum) {
 221         exit(1);
 222 }
 223
 224
 225
 226 /*
 227  * Some initialization stuff...
 228  */
 229 void init_sysdep(void) {
 230         sigset_t set;
 231
 232         /* Avoid vulnerabilities related to FD_SETSIZE if we can. */
 233 #ifdef FD_SETSIZE
 234 #ifdef RLIMIT_NOFILE
 235         struct rlimit rl;
 236         getrlimit(RLIMIT_NOFILE, &rl);
 237         rl.rlim_cur = FD_SETSIZE;
 238         rl.rlim_max = FD_SETSIZE;
 239         setrlimit(RLIMIT_NOFILE, &rl);
 240 #endif
 241 #endif
 242
 243         /* If we've got OpenSSL, we're going to use it. */
 244 #ifdef HAVE_OPENSSL
 245         init_ssl();
 246 #endif
 247
 248         /*
 249          * Set up a place to put thread-specific data.
 250          * We only need a single pointer per thread - it points to the
 251          * CitContext structure (in the ContextList linked list) of the
 252          * session to which the calling thread is currently bound.
 253          */
 254         if (citthread_key_create(&MyConKey, NULL) != 0) {
 255                 CtdlLogPrintf(CTDL_CRIT, "Can't create TSD key: %s\n",
 256                         strerror(errno));
 257         }
 258
 259         /*
 260          * The action for unexpected signals and exceptions should be to
 261          * call signal_cleanup() to gracefully shut down the server.
 262          */
 263         sigemptyset(&set);
 264         sigaddset(&set, SIGINT);                // intr = shutdown
 265         // sigaddset(&set, SIGQUIT);            // quit = force quit
 266         sigaddset(&set, SIGHUP);
 267         sigaddset(&set, SIGTERM);
 268         // sigaddset(&set, SIGSEGV);            // we want core dumps
 269         // sigaddset(&set, SIGILL);             // we want core dumps
 270         // sigaddset(&set, SIGBUS);
 271         sigprocmask(SIG_UNBLOCK, &set, NULL);
 272
 273         signal(SIGINT, signal_cleanup);         // intr = shutdown
 274         // signal(SIGQUIT, signal_cleanup);     // quit = force quit
 275         signal(SIGHUP, signal_cleanup);
 276         signal(SIGTERM, signal_cleanup);
 277         signal(SIGUSR2, signal_exit);
 278         // signal(SIGSEGV, signal_cleanup);     // we want coredumps
 279         // signal(SIGILL, signal_cleanup);      // we want core dumps
 280         // signal(SIGBUS, signal_cleanup);
 281
 282         /*
 283          * Do not shut down the server on broken pipe signals, otherwise the
 284          * whole Citadel service would come down whenever a single client
 285          * socket breaks.
 286          */
 287         signal(SIGPIPE, SIG_IGN);
 288 }
 289
 290
 291
 292
 293 /*
 294  * This is a generic function to set up a master socket for listening on
 295  * a TCP port.  The server shuts down if the bind fails.
 296  *
 297  */
 298 int ig_tcp_server(char *ip_addr, int port_number, int queue_len, char **errormessage)
 299 {
 300         struct sockaddr_in sin;
 301         int s, i;
 302         int actual_queue_len;
 303
 304         actual_queue_len = queue_len;
 305         if (actual_queue_len < 5) actual_queue_len = 5;
 306
 307         memset(&sin, 0, sizeof(sin));
 308         sin.sin_family = AF_INET;
 309         sin.sin_port = htons((u_short)port_number);
 310         if (ip_addr == NULL) {
 311                 sin.sin_addr.s_addr = INADDR_ANY;
 312         }
 313         else {
 314                 sin.sin_addr.s_addr = inet_addr(ip_addr);
 315         }
 316
 317         if (sin.sin_addr.s_addr == !INADDR_ANY) {
 318                 sin.sin_addr.s_addr = INADDR_ANY;
 319         }
 320
 321         s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 322
 323         if (s < 0) {
 324                 *errormessage = (char*) malloc(SIZ + 1);
 325                 snprintf(*errormessage, SIZ,
 326                                  "citserver: Can't create a socket: %s",
 327                                  strerror(errno));
 328                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 329                 return(-1);
 330         }
 331
 332         i = 1;
 333         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 334
 335         if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
 336                 *errormessage = (char*) malloc(SIZ + 1);
 337                 snprintf(*errormessage, SIZ,
 338                                  "citserver: Can't bind: %s",
 339                                  strerror(errno));
 340                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 341                 close(s);
 342                 return(-1);
 343         }
 344
 345         /* set to nonblock - we need this for some obscure situations */
 346         if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
 347                 *errormessage = (char*) malloc(SIZ + 1);
 348                 snprintf(*errormessage, SIZ,
 349                                  "citserver: Can't set socket to non-blocking: %s",
 350                                  strerror(errno));
 351                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 352                 close(s);
 353                 return(-1);
 354         }
 355
 356         if (listen(s, actual_queue_len) < 0) {
 357                 *errormessage = (char*) malloc(SIZ + 1);
 358                 snprintf(*errormessage, SIZ,
 359                                  "citserver: Can't listen: %s",
 360                                  strerror(errno));
 361                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 362                 close(s);
 363                 return(-1);
 364         }
 365
 366         return(s);
 367 }
 368
 369
 370
 371 /*
 372  * Create a Unix domain socket and listen on it
 373  */
 374 int ig_uds_server(char *sockpath, int queue_len, char **errormessage)
 375 {
 376         struct sockaddr_un addr;
 377         int s;
 378         int i;
 379         int actual_queue_len;
 380 #ifdef HAVE_STRUCT_UCRED
 381         int passcred = 1;
 382 #endif
 383
 384         actual_queue_len = queue_len;
 385         if (actual_queue_len < 5) actual_queue_len = 5;
 386
 387         i = unlink(sockpath);
 388         if ((i != 0) && (errno != ENOENT)) {
 389                 *errormessage = (char*) malloc(SIZ + 1);
 390                 snprintf(*errormessage, SIZ, "citserver: can't unlink %s: %s",
 391                         sockpath, strerror(errno));
 392                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 393                 return(-1);
 394         }
 395
 396         memset(&addr, 0, sizeof(addr));
 397         addr.sun_family = AF_UNIX;
 398         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 399
 400         s = socket(AF_UNIX, SOCK_STREAM, 0);
 401         if (s < 0) {
 402                 *errormessage = (char*) malloc(SIZ + 1);
 403                 snprintf(*errormessage, SIZ,
 404                          "citserver: Can't create a socket: %s",
 405                          strerror(errno));
 406                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 407                 return(-1);
 408         }
 409
 410         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 411                 *errormessage = (char*) malloc(SIZ + 1);
 412                 snprintf(*errormessage, SIZ,
 413                          "citserver: Can't bind: %s",
 414                          strerror(errno));
 415                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 416                 return(-1);
 417         }
 418
 419         /* set to nonblock - we need this for some obscure situations */
 420         if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
 421                 *errormessage = (char*) malloc(SIZ + 1);
 422                 snprintf(*errormessage, SIZ,
 423                          "citserver: Can't set socket to non-blocking: %s",
 424                          strerror(errno));
 425                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 426                 close(s);
 427                 return(-1);
 428         }
 429
 430         if (listen(s, actual_queue_len) < 0) {
 431                 *errormessage = (char*) malloc(SIZ + 1);
 432                 snprintf(*errormessage, SIZ,
 433                          "citserver: Can't listen: %s",
 434                          strerror(errno));
 435                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 436                 return(-1);
 437         }
 438
 439 #ifdef HAVE_STRUCT_UCRED
 440         setsockopt(s, SOL_SOCKET, SO_PASSCRED, &passcred, sizeof(passcred));
 441 #endif
 442
 443         chmod(sockpath, S_ISGID|S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
 444         return(s);
 445 }
 446
 447
 448
 449 /*
 450  * The following functions implement output buffering on operating systems which
 451  * support it (such as Linux and various BSD flavors).
 452  */
 453 #ifndef HAVE_DARWIN
 454 #ifdef TCP_CORK
 455 #       define HAVE_TCP_BUFFERING
 456 #else
 457 #       ifdef TCP_NOPUSH
 458 #               define HAVE_TCP_BUFFERING
 459 #               define TCP_CORK TCP_NOPUSH
 460 #       endif
 461 #endif /* TCP_CORK */
 462 #endif /* HAVE_DARWIN */
 463
 464 static unsigned on = 1, off = 0;
 465
 466 void buffer_output(void) {
 467 #ifdef HAVE_TCP_BUFFERING
 468 #ifdef HAVE_OPENSSL
 469         if (!CC->redirect_ssl)
 470 #endif
 471                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 472 #endif
 473 }
 474
 475 void unbuffer_output(void) {
 476 #ifdef HAVE_TCP_BUFFERING
 477 #ifdef HAVE_OPENSSL
 478         if (!CC->redirect_ssl)
 479 #endif
 480                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 481 #endif
 482 }
 483
 484 void flush_output(void) {
 485 #ifdef HAVE_TCP_BUFFERING
 486         struct CitContext *CCC = CC;
 487         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 488         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 489 #endif
 490 }
 491
 492 /*
 493 static void flush_client_inbuf(void)
 494 {
 495         CitContext *CCC=CC;
 496
 497         FlushStrBuf(CCC->ReadBuf);
 498         CCC->Pos = NULL;
 499
 500 }
 501 */
 502
 503 /*
 504  * client_write()   ...    Send binary data to the client.
 505  */
 506 int client_write(const char *buf, int nbytes)
 507 {
 508         int bytes_written = 0;
 509         int retval;
 510 #ifndef HAVE_TCP_BUFFERING
 511         int old_buffer_len = 0;
 512 #endif
 513         fd_set wset;
 514         CitContext *Ctx;
 515         int fdflags;
 516
 517         if (nbytes < 1) return(0);
 518
 519 //      flush_client_inbuf();
 520         Ctx = CC;
 521         if (Ctx->redirect_buffer != NULL) {
 522                 StrBufAppendBufPlain(Ctx->redirect_buffer,
 523                                      buf, nbytes, 0);
 524                 return 0;
 525         }
 526
 527 #ifdef HAVE_OPENSSL
 528         if (Ctx->redirect_ssl) {
 529                 client_write_ssl(buf, nbytes);
 530                 return 0;
 531         }
 532 #endif
 533         if (Ctx->client_socket == -1) return -1;
 534
 535         fdflags = fcntl(Ctx->client_socket, F_GETFL);
 536
 537         while ((bytes_written < nbytes) && (Ctx->client_socket != -1)){
 538                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 539                         FD_ZERO(&wset);
 540                         FD_SET(Ctx->client_socket, &wset);
 541                         if (select(1, NULL, &wset, NULL, NULL) == -1) {
 542                                 if (errno == EINTR)
 543                                 {
 544                                         CtdlLogPrintf(CTDL_DEBUG, "client_write(%d bytes) select() interrupted.\n", nbytes-bytes_written);
 545                                         if (CtdlThreadCheckStop()) {
 546                                                 CC->kill_me = 1;
 547                                                 return (-1);
 548                                         } else {
 549                                                 /* can't trust fd's and stuff so we need to re-create them */
 550                                                 continue;
 551                                         }
 552                                 } else {
 553                                         CtdlLogPrintf(CTDL_ERR,
 554                                                 "client_write(%d bytes) select failed: %s (%d)\n",
 555                                                 nbytes - bytes_written,
 556                                                 strerror(errno), errno);
 557                                         cit_backtrace();
 558                                         Ctx->kill_me = 1;
 559                                         return -1;
 560                                 }
 561                         }
 562                 }
 563
 564                 retval = write(Ctx->client_socket, &buf[bytes_written],
 565                         nbytes - bytes_written);
 566                 if (retval < 1) {
 567                         CtdlLogPrintf(CTDL_ERR,
 568                                 "client_write(%d bytes) failed: %s (%d)\n",
 569                                 nbytes - bytes_written,
 570                                 strerror(errno), errno);
 571                         cit_backtrace();
 572                         // CtdlLogPrintf(CTDL_DEBUG, "Tried to send: %s",  &buf[bytes_written]);
 573                         Ctx->kill_me = 1;
 574                         return -1;
 575                 }
 576                 bytes_written = bytes_written + retval;
 577         }
 578         return 0;
 579 }
 580
 581 void cputbuf(const StrBuf *Buf) {
 582         client_write(ChrPtr(Buf), StrLength(Buf));
 583 }
 584
 585
 586 /*
 587  * cprintf()    Send formatted printable data to the client.
 588  *              Implemented in terms of client_write() so it's technically not sysdep...
 589  */
 590 void cprintf(const char *format, ...) {
 591         va_list arg_ptr;
 592         char buf[1024];
 593
 594         va_start(arg_ptr, format);
 595         if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
 596                 buf[sizeof buf - 2] = '\n';
 597         client_write(buf, strlen(buf));
 598         va_end(arg_ptr);
 599 }
 600
 601
 602 /*
 603  * Read data from the client socket.
 604  *
 605  * sock         socket fd to read from
 606  * buf          buffer to read into
 607  * bytes        number of bytes to read
 608  * timeout      Number of seconds to wait before timing out
 609  *
 610  * Possible return values:
 611  *      1       Requested number of bytes has been read.
 612  *      0       Request timed out.
 613  *      -1      Connection is broken, or other error.
 614  */
 615 int client_read_blob(StrBuf *Target, int bytes, int timeout)
 616 {
 617         CitContext *CCC=CC;
 618         const char *Error;
 619         int retval = 0;
 620
 621 #ifdef HAVE_OPENSSL
 622         if (CCC->redirect_ssl) {
 623                 retval = client_read_sslblob(Target, bytes, timeout);
 624                 if (retval < 0) {
 625                         CtdlLogPrintf(CTDL_CRIT,
 626                                       "%s failed\n",
 627                                       __FUNCTION__);
 628                 }
 629         }
 630         else
 631 #endif
 632         {
 633                 retval = StrBufReadBLOBBuffered(Target,
 634                                                 CCC->ReadBuf,
 635                                                 &CCC->Pos,
 636                                                 &CCC->client_socket,
 637                                                 1,
 638                                                 bytes,
 639                                                 O_TERM,
 640                                                 &Error);
 641                 if (retval < 0) {
 642                         CtdlLogPrintf(CTDL_CRIT,
 643                                       "%s failed: %s\n",
 644                                       __FUNCTION__,
 645                                       Error);
 646                         return retval;
 647                 }
 648                 else
 649                 {
 650 #ifdef BIGBAD_IODBG
 651                         int rv = 0;
 652                         char fn [SIZ];
 653                         FILE *fd;
 654
 655                         snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 656
 657                         fd = fopen(fn, "a+");
 658                         fprintf(fd, "Read: BufSize: %d BufContent: [",
 659                                 StrLength(Target));
 660                         rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 661                         fprintf(fd, "]\n");
 662
 663
 664                         fclose(fd);
 665 #endif
 666
 667                 }
 668         }
 669         return retval;
 670 }
 671
 672
 673 /*
 674  * to make client_read_random_blob() more efficient, increase buffer size.
 675  * just use in greeting function, else your buffer may be flushed
 676  */
 677 void client_set_inbound_buf(long N)
 678 {
 679         FlushStrBuf(CC->ReadBuf);
 680         ReAdjustEmptyBuf(CC->ReadBuf, N * SIZ, N * SIZ);
 681 }
 682
 683 int client_read_random_blob(StrBuf *Target, int timeout)
 684 {
 685         CitContext *CCC=CC;
 686         int rc;
 687
 688         rc =  client_read_blob(Target, 1, timeout);
 689         if (rc > 0)
 690         {
 691                 long len;
 692                 const char *pch;
 693
 694                 len = StrLength(CCC->ReadBuf);
 695                 pch = ChrPtr(CCC->ReadBuf);
 696
 697                 if (len > 0)
 698                 {
 699                         if (CCC->Pos != NULL) {
 700                                 len -= CCC->Pos - pch;
 701                                 pch = CCC->Pos;
 702                         }
 703                         StrBufAppendBufPlain(Target, pch, len, 0);
 704                         FlushStrBuf(CCC->ReadBuf);
 705                         CCC->Pos = NULL;
 706 #ifdef BIGBAD_IODBG
 707                         {
 708                                 int rv = 0;
 709                                 char fn [SIZ];
 710                                 FILE *fd;
 711
 712                                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 713
 714                                 fd = fopen(fn, "a+");
 715                                 fprintf(fd, "Read: BufSize: %d BufContent: [",
 716                                         StrLength(Target));
 717                                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 718                                 fprintf(fd, "]\n");
 719
 720
 721                                 fclose(fd);
 722                         }
 723 #endif
 724
 725                         return StrLength(Target);
 726                 }
 727                 return rc;
 728         }
 729         else
 730                 return rc;
 731 }
 732
 733 int client_read_to(char *buf, int bytes, int timeout)
 734 {
 735         CitContext *CCC=CC;
 736         int rc;
 737
 738         rc = client_read_blob(CCC->MigrateBuf, bytes, timeout);
 739         if (rc < 0)
 740         {
 741                 *buf = '\0';
 742                 return rc;
 743         }
 744         else
 745         {
 746                 memcpy(buf,
 747                        ChrPtr(CCC->MigrateBuf),
 748                        StrLength(CCC->MigrateBuf) + 1);
 749                 FlushStrBuf(CCC->MigrateBuf);
 750                 return rc;
 751         }
 752 }
 753
 754
 755 int HaveMoreLinesWaiting(CitContext *CCC)
 756 {
 757         if ((CCC->kill_me == 1) || (
 758             (CCC->Pos == NULL) &&
 759             (StrLength(CCC->ReadBuf) == 0) &&
 760             (CCC->client_socket != -1)) )
 761                 return 0;
 762         else
 763                 return 1;
 764 }
 765
 766
 767 /*
 768  * Read data from the client socket with default timeout.
 769  * (This is implemented in terms of client_read_to() and could be
 770  * justifiably moved out of sysdep.c)
 771  */
 772 INLINE int client_read(char *buf, int bytes)
 773 {
 774         return(client_read_to(buf, bytes, config.c_sleeping));
 775 }
 776
 777 int CtdlClientGetLine(StrBuf *Target)
 778 {
 779         CitContext *CCC=CC;
 780         const char *Error;
 781         int rc;
 782
 783         FlushStrBuf(Target);
 784 #ifdef HAVE_OPENSSL
 785         if (CCC->redirect_ssl) {
 786 #ifdef BIGBAD_IODBG
 787                 char fn [SIZ];
 788                 FILE *fd;
 789                 int len = 0;
 790                 int rlen = 0;
 791                 int  nlen = 0;
 792                 int nrlen = 0;
 793                 const char *pch;
 794
 795                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 796
 797                 fd = fopen(fn, "a+");
 798                 pch = ChrPtr(CCC->ReadBuf);
 799                 len = StrLength(CCC->ReadBuf);
 800                 if (CCC->Pos != NULL)
 801                         rlen = CC->Pos - pch;
 802                 else
 803                         rlen = 0;
 804
 805 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 806                         len, rlen, pch);
 807 */
 808                 fprintf(fd, "\n\n\nSSL1: BufSize: %d BufPos: %d \n_____________________\n",
 809                         len, rlen);
 810 #endif
 811                 rc = client_readline_sslbuffer(Target,
 812                                                CCC->ReadBuf,
 813                                                &CCC->Pos,
 814                                                1);
 815 #ifdef BIGBAD_IODBG
 816                 pch = ChrPtr(CCC->ReadBuf);
 817                 nlen = StrLength(CCC->ReadBuf);
 818                 if (CCC->Pos != NULL)
 819                         nrlen = CC->Pos - pch;
 820                 else
 821                         nrlen = 0;
 822 /*
 823                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 824                         len, nlen, rlen, nrlen, pch);
 825 */
 826                 fprintf(fd, "\n\n\nSSL2: BufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 827                         len, nlen, rlen, nrlen);
 828
 829                 fprintf(fd, "SSL3: Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 830                         StrLength(Target), ChrPtr(Target));
 831                 fclose(fd);
 832
 833                 if (rc < 0)
 834                         CtdlLogPrintf(CTDL_CRIT,
 835                                       "%s failed\n",
 836                                       __FUNCTION__);
 837 #endif
 838                 return rc;
 839         }
 840         else
 841 #endif
 842         {
 843 #ifdef BIGBAD_IODBG
 844                 char fn [SIZ];
 845                 FILE *fd;
 846                 int len, rlen, nlen, nrlen;
 847                 const char *pch;
 848
 849                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 850
 851                 fd = fopen(fn, "a+");
 852                 pch = ChrPtr(CCC->ReadBuf);
 853                 len = StrLength(CCC->ReadBuf);
 854                 if (CCC->Pos != NULL)
 855                         rlen = CC->Pos - pch;
 856                 else
 857                         rlen = 0;
 858
 859 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 860                         len, rlen, pch);
 861 */
 862                 fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \n_____________________\n",
 863                         len, rlen);
 864 #endif
 865                 rc = StrBufTCP_read_buffered_line_fast(Target,
 866                                                        CCC->ReadBuf,
 867                                                        &CCC->Pos,
 868                                                        &CCC->client_socket,
 869                                                        5,
 870                                                        1,
 871                                                        &Error);
 872
 873 #ifdef BIGBAD_IODBG
 874                 pch = ChrPtr(CCC->ReadBuf);
 875                 nlen = StrLength(CCC->ReadBuf);
 876                 if (CCC->Pos != NULL)
 877                         nrlen = CC->Pos - pch;
 878                 else
 879                         nrlen = 0;
 880 /*
 881                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 882                         len, nlen, rlen, nrlen, pch);
 883 */
 884                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 885                         len, nlen, rlen, nrlen);
 886
 887                 fprintf(fd, "Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 888                         StrLength(Target), ChrPtr(Target));
 889                 fclose(fd);
 890
 891                 if ((rc < 0) && (Error != NULL))
 892                         CtdlLogPrintf(CTDL_CRIT,
 893                                       "%s failed: %s\n",
 894                                       __FUNCTION__,
 895                                       Error);
 896 #endif
 897                 return rc;
 898         }
 899 }
 900
 901
 902 /*
 903  * client_getln()   ...   Get a LF-terminated line of text from the client.
 904  * (This is implemented in terms of client_read() and could be
 905  * justifiably moved out of sysdep.c)
 906  */
 907 int client_getln(char *buf, int bufsize)
 908 {
 909         int i, retval;
 910         CitContext *CCC=CC;
 911         const char *pCh;
 912
 913         retval = CtdlClientGetLine(CCC->MigrateBuf);
 914         if (retval < 0)
 915           return(retval >= 0);
 916
 917
 918         i = StrLength(CCC->MigrateBuf);
 919         pCh = ChrPtr(CCC->MigrateBuf);
 920         /* Strip the trailing LF, and the trailing CR if present.
 921          */
 922         if (bufsize <= i)
 923                 i = bufsize - 1;
 924         while ( (i > 0)
 925                 && ( (pCh[i - 1]==13)
 926                      || ( pCh[i - 1]==10)) ) {
 927                 i--;
 928         }
 929         memcpy(buf, pCh, i);
 930         buf[i] = 0;
 931
 932         FlushStrBuf(CCC->MigrateBuf);
 933         if (retval < 0) {
 934                 safestrncpy(&buf[i], "000", bufsize - i);
 935         }
 936         return(retval >= 0);
 937 }
 938
 939
 940 /*
 941  * Cleanup any contexts that are left lying around
 942  */
 943
 944
 945 void close_masters (void)
 946 {
 947         struct ServiceFunctionHook *serviceptr;
 948
 949         /*
 950          * close all protocol master sockets
 951          */
 952         for (serviceptr = ServiceHookTable; serviceptr != NULL;
 953             serviceptr = serviceptr->next ) {
 954
 955                 if (serviceptr->tcp_port > 0)
 956                 {
 957                         CtdlLogPrintf(CTDL_INFO, "Closing listener on port %d\n",
 958                                 serviceptr->tcp_port);
 959                         serviceptr->tcp_port = 0;
 960                 }
 961
 962                 if (serviceptr->sockpath != NULL)
 963                         CtdlLogPrintf(CTDL_INFO, "Closing listener on '%s'\n",
 964                                 serviceptr->sockpath);
 965
 966                 close(serviceptr->msock);
 967                 /* If it's a Unix domain socket, remove the file. */
 968                 if (serviceptr->sockpath != NULL) {
 969                         unlink(serviceptr->sockpath);
 970                         serviceptr->sockpath = NULL;
 971                 }
 972         }
 973 }
 974
 975
 976 /*
 977  * The system-dependent part of master_cleanup() - close the master socket.
 978  */
 979 void sysdep_master_cleanup(void) {
 980
 981         close_masters();
 982
 983         context_cleanup();
 984
 985 #ifdef HAVE_OPENSSL
 986         destruct_ssl();
 987 #endif
 988         CtdlDestroyProtoHooks();
 989         CtdlDestroyDeleteHooks();
 990         CtdlDestroyXmsgHooks();
 991         CtdlDestroyNetprocHooks();
 992         CtdlDestroyUserHooks();
 993         CtdlDestroyMessageHook();
 994         CtdlDestroyCleanupHooks();
 995         CtdlDestroyFixedOutputHooks();
 996         CtdlDestroySessionHooks();
 997         CtdlDestroyServiceHook();
 998         CtdlDestroyRoomHooks();
 999         #ifdef HAVE_BACKTRACE
1000 ///     eCrash_Uninit();
1001         #endif
1002 }
1003
1004
1005
1006 pid_t current_child;
1007 void graceful_shutdown(int signum) {
1008         kill(current_child, signum);
1009         unlink(file_pid_file);
1010         exit(0);
1011 }
1012
1013 int nFireUps = 0;
1014 int nFireUpsNonRestart = 0;
1015 pid_t ForkedPid = 1;
1016
1017 /*
1018  * Start running as a daemon.
1019  */
1020 void start_daemon(int unused) {
1021         int status = 0;
1022         pid_t child = 0;
1023         FILE *fp;
1024         int do_restart = 0;
1025
1026         current_child = 0;
1027
1028         /* Close stdin/stdout/stderr and replace them with /dev/null.
1029          * We don't just call close() because we don't want these fd's
1030          * to be reused for other files.
1031          */
1032         if (chdir(ctdl_run_dir) != 0)
1033                 CtdlLogPrintf(CTDL_EMERG,
1034                               "unable to change into directory [%s]: %s",
1035                               ctdl_run_dir, strerror(errno));
1036
1037         child = fork();
1038         if (child != 0) {
1039                 exit(0);
1040         }
1041
1042         signal(SIGHUP, SIG_IGN);
1043         signal(SIGINT, SIG_IGN);
1044         signal(SIGQUIT, SIG_IGN);
1045
1046         setsid();
1047         umask(0);
1048         if ((freopen("/dev/null", "r", stdin) != stdin) ||
1049             (freopen("/dev/null", "w", stdout) != stdout) ||
1050             (freopen("/dev/null", "w", stderr) != stderr))
1051                 CtdlLogPrintf(CTDL_EMERG,
1052                               "unable to reopen stdin/out/err %s",
1053                               strerror(errno));
1054
1055
1056         do {
1057                 current_child = fork();
1058
1059                 signal(SIGTERM, graceful_shutdown);
1060
1061                 if (current_child < 0) {
1062                         perror("fork");
1063                         exit(errno);
1064                 }
1065
1066                 else if (current_child == 0) {
1067                         return; /* continue starting citadel. */
1068                 }
1069
1070                 else {
1071                         fp = fopen(file_pid_file, "w");
1072                         if (fp != NULL) {
1073                                 fprintf(fp, ""F_PID_T"\n", getpid());
1074                                 fclose(fp);
1075                         }
1076                         waitpid(current_child, &status, 0);
1077                 }
1078                 do_restart = 0;
1079                 nFireUpsNonRestart = nFireUps;
1080
1081                 /* Exit code 0 means the watcher should exit */
1082                 if (WIFEXITED(status) && (WEXITSTATUS(status) == CTDLEXIT_SHUTDOWN)) {
1083                         do_restart = 0;
1084                 }
1085
1086                 /* Exit code 101-109 means the watcher should exit */
1087                 else if (WIFEXITED(status) && (WEXITSTATUS(status) >= 101) && (WEXITSTATUS(status) <= 109)) {
1088                         do_restart = 0;
1089                 }
1090
1091                 /* Any other exit code, or no exit code, means we should restart. */
1092                 else {
1093                         do_restart = 1;
1094                         nFireUps++;
1095                         ForkedPid = current_child;
1096                 }
1097
1098         } while (do_restart);
1099
1100         unlink(file_pid_file);
1101         exit(WEXITSTATUS(status));
1102 }
1103
1104
1105
1106 void checkcrash(void)
1107 {
1108         if (nFireUpsNonRestart != nFireUps)
1109         {
1110                 StrBuf *CrashMail;
1111
1112                 CrashMail = NewStrBuf();
1113                 CtdlLogPrintf(CTDL_ALERT, "Posting crash message\n");
1114                 StrBufPrintf(CrashMail,
1115                         " \n"
1116                         " The Citadel server process (citserver) terminated unexpectedly."
1117                         "\n \n"
1118                         " This could be the result of a bug in the server program, or some external "
1119                         "factor.\n \n"
1120                         " You can obtain more information about this by enabling core dumps.\n \n"
1121                         " For more information, please see:\n \n"
1122                         " http://citadel.org/doku.php/faq:mastering_your_os:gdb#how.do.i.make.my.system.produce.core-files"
1123                         "\n \n"
1124
1125                         " If you have already done this, the core dump is likely to be found at %score.%d\n"
1126                         ,
1127                         ctdl_run_dir, ForkedPid);
1128                 CtdlAideMessage(ChrPtr(CrashMail), "Citadel server process terminated unexpectedly");
1129                 FreeStrBuf(&CrashMail);
1130         }
1131 }
1132
1133
1134 /*
1135  * Generic routine to convert a login name to a full name (gecos)
1136  * Returns nonzero if a conversion took place
1137  */
1138 int convert_login(char NameToConvert[]) {
1139         struct passwd *pw;
1140         int a;
1141
1142         pw = getpwnam(NameToConvert);
1143         if (pw == NULL) {
1144                 return(0);
1145         }
1146         else {
1147                 strcpy(NameToConvert, pw->pw_gecos);
1148                 for (a=0; a<strlen(NameToConvert); ++a) {
1149                         if (NameToConvert[a] == ',') NameToConvert[a] = 0;
1150                 }
1151                 return(1);
1152         }
1153 }
1154
1155
1156
1157 /*
1158  * This loop just keeps going and going and going...
1159  */
1160 /*
1161  * FIXME:
1162  * This current implimentation of worker_thread creates a bottle neck in several situations
1163  * The first thing to remember is that a single thread can handle more than one connection at a time.
1164  * More threads mean less memory for the system to run in.
1165  * So for efficiency we want every thread to be doing something useful or waiting in the main loop for
1166  * something to happen anywhere.
1167  * This current implimentation requires worker threads to wait in other locations, after it has
1168  * been committed to a single connection which is very wasteful.
1169  * As an extreme case consider this:
1170  * A slow client connects and this slow client sends only one character each second.
1171  * With this current implimentation a single worker thread is dispatched to handle that connection
1172  * until such times as the client timeout expires, an error occurs on the socket or the client
1173  * completes its transmission.
1174  * THIS IS VERY BAD since that thread could have handled a read from many more clients in each one
1175  * second interval between chars.
1176  *
1177  * It is my intention to re-write this code and the associated client_getln, client_read functions
1178  * to allow any thread to read data on behalf of any connection (context).
1179  * To do this I intend to have this main loop read chars into a buffer stored in the context.
1180  * Once the correct criteria for a full buffer is met then we will dispatch a thread to
1181  * process it.
1182  * This worker thread loop also needs to be able to handle binary data.
1183  */
1184
1185 void *worker_thread(void *arg) {
1186         int highest;
1187         CitContext *ptr;
1188         CitContext *bind_me = NULL;
1189         fd_set readfds;
1190         int retval = 0;
1191         struct timeval tv;
1192         int force_purge = 0;
1193
1194
1195         while (!CtdlThreadCheckStop()) {
1196
1197                 /* make doubly sure we're not holding any stale db handles
1198                  * which might cause a deadlock.
1199                  */
1200                 cdb_check_handles();
1201 do_select:      force_purge = 0;
1202                 bind_me = NULL;         /* Which session shall we handle? */
1203
1204                 /* Initialize the fdset. */
1205                 FD_ZERO(&readfds);
1206                 highest = 0;
1207
1208                 begin_critical_section(S_SESSION_TABLE);
1209                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1210                         int client_socket;
1211                         client_socket = ptr->client_socket;
1212                         /* Dont select on dead sessions only truly idle ones */
1213                         if ((ptr->state == CON_IDLE) &&
1214                             (CC->kill_me == 0) &&
1215                             (client_socket != -1))
1216                         {
1217                                 FD_SET(client_socket, &readfds);
1218                                 if (client_socket > highest)
1219                                         highest = client_socket;
1220                         }
1221                         if ((bind_me == NULL) && (ptr->state == CON_READY)) {
1222                                 bind_me = ptr;
1223                                 ptr->state = CON_EXECUTING;
1224                                 break;
1225                         }
1226                         if ((bind_me == NULL) && (ptr->state == CON_GREETING)) {
1227                                 bind_me = ptr;
1228                                 ptr->state = CON_STARTING;
1229                                 break;
1230                         }
1231                 }
1232                 end_critical_section(S_SESSION_TABLE);
1233
1234                 if (bind_me) {
1235                         goto SKIP_SELECT;
1236                 }
1237
1238                 /* If we got this far, it means that there are no sessions
1239                  * which a previous thread marked for attention, so we go
1240                  * ahead and get ready to select().
1241                  */
1242
1243                 if (!CtdlThreadCheckStop()) {
1244                         tv.tv_sec = 1;          /* wake up every second if no input */
1245                         tv.tv_usec = 0;
1246                         retval = CtdlThreadSelect(highest + 1, &readfds, NULL, NULL, &tv);
1247                 }
1248                 else
1249                         return NULL;
1250
1251                 /* Now figure out who made this select() unblock.
1252                  * First, check for an error or exit condition.
1253                  */
1254                 if (retval < 0) {
1255                         if (errno == EBADF) {
1256                                 CtdlLogPrintf(CTDL_NOTICE, "select() failed: (%s)\n",
1257                                         strerror(errno));
1258                                 goto do_select;
1259                         }
1260                         if (errno != EINTR) {
1261                                 CtdlLogPrintf(CTDL_EMERG, "Exiting (%s)\n", strerror(errno));
1262                                 CtdlThreadStopAll();
1263                                 continue;
1264                         } else {
1265                                 CtdlLogPrintf(CTDL_DEBUG, "Interrupted CtdlThreadSelect.\n");
1266                                 if (CtdlThreadCheckStop()) return(NULL);
1267                                 goto do_select;
1268                         }
1269                 }
1270                 else if(retval == 0) {
1271                         if (CtdlThreadCheckStop()) return(NULL);
1272                 }
1273
1274                 /* It must be a client socket.  Find a context that has data
1275                  * waiting on its socket *and* is in the CON_IDLE state.  Any
1276                  * active sockets other than our chosen one are marked as
1277                  * CON_READY so the next thread that comes around can just bind
1278                  * to one without having to select() again.
1279                  */
1280                 begin_critical_section(S_SESSION_TABLE);
1281                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1282                         int checkfd = ptr->client_socket;
1283                         if ((checkfd != -1) && (ptr->state == CON_IDLE) ){
1284                                 if (FD_ISSET(checkfd, &readfds)) {
1285                                         ptr->input_waiting = 1;
1286                                         if (!bind_me) {
1287                                                 bind_me = ptr;  /* I choose you! */
1288                                                 bind_me->state = CON_EXECUTING;
1289                                         }
1290                                         else {
1291                                                 ptr->state = CON_READY;
1292                                         }
1293                                 } else if ((ptr->is_async) && (ptr->async_waiting) && (ptr->h_async_function)) {
1294                                         if (!bind_me) {
1295                                                 bind_me = ptr;  /* I choose you! */
1296                                                 bind_me->state = CON_EXECUTING;
1297                                         }
1298                                         else {
1299                                                 ptr->state = CON_READY;
1300                                         }
1301                                 }
1302                         }
1303                 }
1304                 end_critical_section(S_SESSION_TABLE);
1305
1306 SKIP_SELECT:
1307                 /* We're bound to a session */
1308                 if (bind_me != NULL) {
1309                         become_session(bind_me);
1310
1311                         if (bind_me->state == CON_STARTING) {
1312                                 bind_me->state = CON_EXECUTING;
1313                                 begin_session(bind_me);
1314                                 bind_me->h_greeting_function();
1315                         }
1316                         /* If the client has sent a command, execute it. */
1317                         if (CC->input_waiting) {
1318                                 CC->h_command_function();
1319
1320                                 while (HaveMoreLinesWaiting(CC))
1321                                        CC->h_command_function();
1322
1323                                 CC->input_waiting = 0;
1324                         }
1325
1326                         /* If there are asynchronous messages waiting and the
1327                          * client supports it, do those now */
1328                         if ((CC->is_async) && (CC->async_waiting)
1329                            && (CC->h_async_function != NULL)) {
1330                                 CC->h_async_function();
1331                                 CC->async_waiting = 0;
1332                         }
1333
1334                         force_purge = CC->kill_me;
1335                         become_session(NULL);
1336                         bind_me->state = CON_IDLE;
1337                 }
1338
1339                 dead_session_purge(force_purge);
1340                 do_housekeeping();
1341         }
1342         /* If control reaches this point, the server is shutting down */
1343         return(NULL);
1344 }
1345
1346
1347
1348
1349 /*
1350  * A function to handle selecting on master sockets.
1351  * In other words it handles new connections.
1352  * It is a thread.
1353  */
1354 void *select_on_master (void *arg)
1355 {
1356         struct ServiceFunctionHook *serviceptr;
1357         fd_set master_fds;
1358         int highest;
1359         struct timeval tv;
1360         int ssock;                      /* Descriptor for client socket */
1361         CitContext *con= NULL;  /* Temporary context pointer */
1362         int m;
1363         int i;
1364         int retval;
1365         struct CitContext select_on_master_CC;
1366
1367         CtdlFillSystemContext(&select_on_master_CC, "select_on_master");
1368         citthread_setspecific(MyConKey, (void *)&select_on_master_CC);
1369
1370         while (!CtdlThreadCheckStop()) {
1371                 /* Initialize the fdset. */
1372                 FD_ZERO(&master_fds);
1373                 highest = 0;
1374
1375                 /* First, add the various master sockets to the fdset. */
1376                 for (serviceptr = ServiceHookTable; serviceptr != NULL;
1377                 serviceptr = serviceptr->next ) {
1378                         m = serviceptr->msock;
1379                         FD_SET(m, &master_fds);
1380                         if (m > highest) {
1381                                 highest = m;
1382                         }
1383                 }
1384
1385                 if (!CtdlThreadCheckStop()) {
1386                         tv.tv_sec = 60;         /* wake up every second if no input */
1387                         tv.tv_usec = 0;
1388                         retval = CtdlThreadSelect(highest + 1, &master_fds, NULL, NULL, &tv);
1389                 }
1390                 else
1391                         return NULL;
1392
1393                 /* Now figure out who made this select() unblock.
1394                  * First, check for an error or exit condition.
1395                  */
1396                 if (retval < 0) {
1397                         if (errno == EBADF) {
1398                                 CtdlLogPrintf(CTDL_NOTICE, "select() failed: (%s)\n",
1399                                         strerror(errno));
1400                                 continue;
1401                         }
1402                         if (errno != EINTR) {
1403                                 CtdlLogPrintf(CTDL_EMERG, "Exiting (%s)\n", strerror(errno));
1404                                 CtdlThreadStopAll();
1405                         } else {
1406                                 CtdlLogPrintf(CTDL_DEBUG, "Interrupted CtdlThreadSelect.\n");
1407                                 if (CtdlThreadCheckStop()) return(NULL);
1408                                 continue;
1409                         }
1410                 }
1411                 else if(retval == 0) {
1412                         if (CtdlThreadCheckStop()) return(NULL);
1413                         continue;
1414                 }
1415                 /* Next, check to see if it's a new client connecting
1416                  * on a master socket.
1417                  */
1418                 else for (serviceptr = ServiceHookTable; serviceptr != NULL;
1419                      serviceptr = serviceptr->next ) {
1420
1421                         if (FD_ISSET(serviceptr->msock, &master_fds)) {
1422                                 ssock = accept(serviceptr->msock, NULL, 0);
1423                                 if (ssock >= 0) {
1424                                         CtdlLogPrintf(CTDL_DEBUG,
1425                                                 "New client socket %d\n",
1426                                                 ssock);
1427
1428                                         /* The master socket is non-blocking but the client
1429                                          * sockets need to be blocking, otherwise certain
1430                                          * operations barf on FreeBSD.  Not a fatal error.
1431                                          */
1432                                         if (fcntl(ssock, F_SETFL, 0) < 0) {
1433                                                 CtdlLogPrintf(CTDL_EMERG,
1434                                                         "citserver: Can't set socket to blocking: %s\n",
1435                                                         strerror(errno));
1436                                         }
1437
1438                                         /* New context will be created already
1439                                          * set up in the CON_EXECUTING state.
1440                                          */
1441                                         con = CreateNewContext();
1442
1443                                         /* Assign our new socket number to it. */
1444                                         con->client_socket = ssock;
1445                                         con->h_command_function =
1446                                                 serviceptr->h_command_function;
1447                                         con->h_async_function =
1448                                                 serviceptr->h_async_function;
1449                                         con->h_greeting_function = serviceptr->h_greeting_function;
1450                                         con->ServiceName =
1451                                                 serviceptr->ServiceName;
1452
1453                                         /* Determine whether it's a local socket */
1454                                         if (serviceptr->sockpath != NULL)
1455                                                 con->is_local_socket = 1;
1456
1457                                         /* Set the SO_REUSEADDR socket option */
1458                                         i = 1;
1459                                         setsockopt(ssock, SOL_SOCKET,
1460                                                 SO_REUSEADDR,
1461                                                 &i, sizeof(i));
1462
1463                                         con->state = CON_GREETING;
1464
1465                                         retval--;
1466                                         if (retval == 0)
1467                                                 break;
1468                                 }
1469                         }
1470                 }
1471         }
1472         CtdlClearSystemContext();
1473
1474         return NULL;
1475 }
1476
1477
1478
1479 /*
1480  * SyslogFacility()
1481  * Translate text facility name to syslog.h defined value.
1482  */
1483 int SyslogFacility(char *name)
1484 {
1485         int i;
1486         struct
1487         {
1488                 int facility;
1489                 char *name;
1490         }   facTbl[] =
1491         {
1492                 {   LOG_KERN,   "kern"          },
1493                 {   LOG_USER,   "user"          },
1494                 {   LOG_MAIL,   "mail"          },
1495                 {   LOG_DAEMON, "daemon"        },
1496                 {   LOG_AUTH,   "auth"          },
1497                 {   LOG_SYSLOG, "syslog"        },
1498                 {   LOG_LPR,    "lpr"           },
1499                 {   LOG_NEWS,   "news"          },
1500                 {   LOG_UUCP,   "uucp"          },
1501                 {   LOG_LOCAL0, "local0"        },
1502                 {   LOG_LOCAL1, "local1"        },
1503                 {   LOG_LOCAL2, "local2"        },
1504                 {   LOG_LOCAL3, "local3"        },
1505                 {   LOG_LOCAL4, "local4"        },
1506                 {   LOG_LOCAL5, "local5"        },
1507                 {   LOG_LOCAL6, "local6"        },
1508                 {   LOG_LOCAL7, "local7"        },
1509                 {   0,            NULL          }
1510         };
1511         for(i = 0; facTbl[i].name != NULL; i++) {
1512                 if(!strcasecmp(name, facTbl[i].name))
1513                         return facTbl[i].facility;
1514         }
1515         enable_syslog = 0;
1516         return LOG_DAEMON;
1517 }
1518
1519
1520 /********** MEM CHEQQER ***********/
1521
1522 #ifdef DEBUG_MEMORY_LEAKS
1523
1524 #undef malloc
1525 #undef realloc
1526 #undef strdup
1527 #undef free
1528
1529 void *tracked_malloc(size_t size, char *file, int line) {
1530         struct igheap *thisheap;
1531         void *block;
1532
1533         block = malloc(size);
1534         if (block == NULL) return(block);
1535
1536         thisheap = malloc(sizeof(struct igheap));
1537         if (thisheap == NULL) {
1538                 free(block);
1539                 return(NULL);
1540         }
1541
1542         thisheap->block = block;
1543         strcpy(thisheap->file, file);
1544         thisheap->line = line;
1545
1546         begin_critical_section(S_DEBUGMEMLEAKS);
1547         thisheap->next = igheap;
1548         igheap = thisheap;
1549         end_critical_section(S_DEBUGMEMLEAKS);
1550
1551         return(block);
1552 }
1553
1554
1555 void *tracked_realloc(void *ptr, size_t size, char *file, int line) {
1556         struct igheap *thisheap;
1557         void *block;
1558
1559         block = realloc(ptr, size);
1560         if (block == NULL) return(block);
1561
1562         thisheap = malloc(sizeof(struct igheap));
1563         if (thisheap == NULL) {
1564                 free(block);
1565                 return(NULL);
1566         }
1567
1568         thisheap->block = block;
1569         strcpy(thisheap->file, file);
1570         thisheap->line = line;
1571
1572         begin_critical_section(S_DEBUGMEMLEAKS);
1573         thisheap->next = igheap;
1574         igheap = thisheap;
1575         end_critical_section(S_DEBUGMEMLEAKS);
1576
1577         return(block);
1578 }
1579
1580
1581
1582 void tracked_free(void *ptr) {
1583         struct igheap *thisheap;
1584         struct igheap *trash;
1585
1586         free(ptr);
1587
1588         if (igheap == NULL) return;
1589         begin_critical_section(S_DEBUGMEMLEAKS);
1590         for (thisheap = igheap; thisheap != NULL; thisheap = thisheap->next) {
1591                 if (thisheap->next != NULL) {
1592                         if (thisheap->next->block == ptr) {
1593                                 trash = thisheap->next;
1594                                 thisheap->next = thisheap->next->next;
1595                                 free(trash);
1596                         }
1597                 }
1598         }
1599         if (igheap->block == ptr) {
1600                 trash = igheap;
1601                 igheap = igheap->next;
1602                 free(trash);
1603         }
1604         end_critical_section(S_DEBUGMEMLEAKS);
1605 }
1606
1607 char *tracked_strdup(const char *s, char *file, int line) {
1608         char *ptr;
1609
1610         if (s == NULL) return(NULL);
1611         ptr = tracked_malloc(strlen(s) + 1, file, line);
1612         if (ptr == NULL) return(NULL);
1613         strncpy(ptr, s, strlen(s));
1614         return(ptr);
1615 }
1616
1617 void dump_heap(void) {
1618         struct igheap *thisheap;
1619
1620         for (thisheap = igheap; thisheap != NULL; thisheap = thisheap->next) {
1621                 CtdlLogPrintf(CTDL_CRIT, "UNFREED: %30s : %d\n",
1622                         thisheap->file, thisheap->line);
1623         }
1624 }
1625
1626 #endif /*  DEBUG_MEMORY_LEAKS */