citadel/sysdep.c

   1 /*
   2  * Citadel "system dependent" stuff.
   3  *
   4  * Here's where we (hopefully) have most parts of the Citadel server that
   5  * would need to be altered to run the server in a non-POSIX environment.
   6  *
   7  * If we ever port to a different platform and either have multiple
   8  * variants of this file or simply load it up with #ifdefs.
   9  *
  10  * Copyright (c) 1987-2011 by the citadel.org team
  11  *
  12  * This program is open source software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License, version 3.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  */
  20
  21 #include "sysdep.h"
  22 #include <stdlib.h>
  23 #include <unistd.h>
  24 #include <stdio.h>
  25 #include <fcntl.h>
  26 #include <ctype.h>
  27 #include <signal.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <sys/wait.h>
  31 #include <sys/socket.h>
  32 #include <syslog.h>
  33 #include <sys/syslog.h>
  34
  35 #if TIME_WITH_SYS_TIME
  36 # include <sys/time.h>
  37 # include <time.h>
  38 #else
  39 # if HAVE_SYS_TIME_H
  40 #  include <sys/time.h>
  41 # else
  42 #  include <time.h>
  43 # endif
  44 #endif
  45
  46 #include <limits.h>
  47 #include <sys/resource.h>
  48 #include <netinet/in.h>
  49 #include <netinet/tcp.h>
  50 #include <arpa/inet.h>
  51 #include <netdb.h>
  52 #include <sys/un.h>
  53 #include <string.h>
  54 #include <pwd.h>
  55 #include <errno.h>
  56 #include <stdarg.h>
  57 #include <grp.h>
  58 #define SHOW_ME_VAPPEND_PRINTF
  59 #include <libcitadel.h>
  60 #include "citadel.h"
  61 #include "server.h"
  62 #include "sysdep_decls.h"
  63 #include "citserver.h"
  64 #include "support.h"
  65 #include "config.h"
  66 #include "database.h"
  67 #include "housekeeping.h"
  68 #include "modules/crypto/serv_crypto.h" /* Needed for init_ssl, client_write_ssl, client_read_ssl, destruct_ssl */
  69 #include "ecrash.h"
  70 #include "context.h"
  71
  72 #ifdef HAVE_SYS_SELECT_H
  73 #include <sys/select.h>
  74 #endif
  75
  76 #include "ctdl_module.h"
  77 #include "threads.h"
  78 #include "user_ops.h"
  79 #include "control.h"
  80
  81
  82 /*
  83  * Signal handler to shut down the server.
  84  */
  85
  86 volatile int exit_signal = 0;
  87 volatile int shutdown_and_halt = 0;
  88 volatile int restart_server = 0;
  89 volatile int running_as_daemon = 0;
  90
  91 static RETSIGTYPE signal_cleanup(int signum) {
  92         syslog(LOG_DEBUG, "Caught signal %d; shutting down.", signum);
  93         exit_signal = signum;
  94         server_shutting_down = 1;
  95 }
  96
  97 static RETSIGTYPE signal_exit(int signum) {
  98         exit(1);
  99 }
 100
 101
 102
 103 /*
 104  * Some initialization stuff...
 105  */
 106 void init_sysdep(void) {
 107         sigset_t set;
 108
 109         /* Avoid vulnerabilities related to FD_SETSIZE if we can. */
 110 #ifdef FD_SETSIZE
 111 #ifdef RLIMIT_NOFILE
 112         struct rlimit rl;
 113         getrlimit(RLIMIT_NOFILE, &rl);
 114         rl.rlim_cur = FD_SETSIZE;
 115         rl.rlim_max = FD_SETSIZE;
 116         setrlimit(RLIMIT_NOFILE, &rl);
 117 #endif
 118 #endif
 119
 120         /* If we've got OpenSSL, we're going to use it. */
 121 #ifdef HAVE_OPENSSL
 122         init_ssl();
 123 #endif
 124
 125         /*
 126          * Set up a place to put thread-specific data.
 127          * We only need a single pointer per thread - it points to the
 128          * CitContext structure (in the ContextList linked list) of the
 129          * session to which the calling thread is currently bound.
 130          */
 131         if (pthread_key_create(&MyConKey, NULL) != 0) {
 132                 syslog(LOG_CRIT, "Can't create TSD key: %s", strerror(errno));
 133         }
 134
 135         /*
 136          * Interript, hangup, and terminate signals should cause the server
 137          * to gracefully clean up and shut down.
 138          */
 139         sigemptyset(&set);
 140         sigaddset(&set, SIGINT);
 141         sigaddset(&set, SIGHUP);
 142         sigaddset(&set, SIGTERM);
 143         sigprocmask(SIG_UNBLOCK, &set, NULL);
 144
 145         signal(SIGINT, signal_cleanup);
 146         signal(SIGHUP, signal_cleanup);
 147         signal(SIGTERM, signal_cleanup);
 148         signal(SIGUSR2, signal_exit);
 149
 150         /*
 151          * Do not shut down the server on broken pipe signals, otherwise the
 152          * whole Citadel service would come down whenever a single client
 153          * socket breaks.
 154          */
 155         signal(SIGPIPE, SIG_IGN);
 156 }
 157
 158
 159 /*
 160  * This is a generic function to set up a master socket for listening on
 161  * a TCP port.  The server shuts down if the bind fails.  (IPv4/IPv6 version)
 162  *
 163  * ip_addr      IP address to bind
 164  * port_number  port number to bind
 165  * queue_len    number of incoming connections to allow in the queue
 166  */
 167 int ctdl_tcp_server(char *ip_addr, int port_number, int queue_len, char *errormessage)
 168 {
 169         struct protoent *p;
 170         struct sockaddr_in6 sin6;
 171         struct sockaddr_in sin4;
 172         int s, i, b;
 173         int ip_version = 6;
 174
 175         memset(&sin6, 0, sizeof(sin6));
 176         memset(&sin4, 0, sizeof(sin4));
 177         sin6.sin6_family = AF_INET6;
 178         sin4.sin_family = AF_INET;
 179
 180         if (    (ip_addr == NULL)                                                       /* any IPv6 */
 181                 || (IsEmptyStr(ip_addr))
 182                 || (!strcmp(ip_addr, "*"))
 183         ) {
 184                 ip_version = 6;
 185                 sin6.sin6_addr = in6addr_any;
 186         }
 187         else if (!strcmp(ip_addr, "0.0.0.0"))                                           /* any IPv4 */
 188         {
 189                 ip_version = 4;
 190                 sin4.sin_addr.s_addr = INADDR_ANY;
 191         }
 192         else if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':')))                     /* specific IPv4 */
 193         {
 194                 ip_version = 4;
 195                 if (inet_pton(AF_INET, ip_addr, &sin4.sin_addr) <= 0) {
 196                         snprintf(errormessage, SIZ,
 197                                  "Error binding to [%s] : %s", ip_addr, strerror(errno)
 198                         );
 199                         syslog(LOG_ALERT, "%s", errormessage);
 200                         return (-1);
 201                 }
 202         }
 203         else                                                                            /* specific IPv6 */
 204         {
 205                 ip_version = 6;
 206                 if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
 207                         snprintf(errormessage, SIZ,
 208                                  "Error binding to [%s] : %s", ip_addr, strerror(errno)
 209                         );
 210                         syslog(LOG_ALERT, "%s", errormessage);
 211                         return (-1);
 212                 }
 213         }
 214
 215         if (port_number == 0) {
 216                 snprintf(errormessage, SIZ, "Can't start: no port number specified.");
 217                 syslog(LOG_ALERT, "%s", errormessage);
 218                 return (-1);
 219         }
 220         sin6.sin6_port = htons((u_short) port_number);
 221         sin4.sin_port = htons((u_short) port_number);
 222
 223         p = getprotobyname("tcp");
 224
 225         s = socket( ((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
 226         if (s < 0) {
 227                 snprintf(errormessage, SIZ,
 228                          "Can't create a listening socket: %s", strerror(errno)
 229                 );
 230                 syslog(LOG_ALERT, "%s", errormessage);
 231                 return (-1);
 232         }
 233         /* Set some socket options that make sense. */
 234         i = 1;
 235         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 236
 237         if (ip_version == 6) {
 238                 b = bind(s, (struct sockaddr *) &sin6, sizeof(sin6));
 239         }
 240         else {
 241                 b = bind(s, (struct sockaddr *) &sin4, sizeof(sin4));
 242         }
 243
 244         if (b < 0) {
 245                 snprintf(errormessage, SIZ,
 246                          "Can't bind: %s", strerror(errno)
 247                 );
 248                 syslog(LOG_ALERT, "%s", errormessage);
 249                 return (-1);
 250         }
 251
 252         fcntl(s, F_SETFL, O_NONBLOCK);
 253
 254         if (listen(s, ((queue_len >= 5) ? queue_len : 5) ) < 0) {
 255                 snprintf(errormessage, SIZ,
 256                          "Can't listen: %s", strerror(errno)
 257                 );
 258                 syslog(LOG_ALERT, "%s", errormessage);
 259                 return (-1);
 260         }
 261         return (s);
 262 }
 263
 264
 265
 266
 267
 268 /*
 269  * Create a Unix domain socket and listen on it
 270  */
 271 int ctdl_uds_server(char *sockpath, int queue_len, char *errormessage)
 272 {
 273         struct sockaddr_un addr;
 274         int s;
 275         int i;
 276         int actual_queue_len;
 277 #ifdef HAVE_STRUCT_UCRED
 278         int passcred = 1;
 279 #endif
 280
 281         actual_queue_len = queue_len;
 282         if (actual_queue_len < 5) actual_queue_len = 5;
 283
 284         i = unlink(sockpath);
 285         if ((i != 0) && (errno != ENOENT)) {
 286                 snprintf(errormessage, SIZ, "citserver: can't unlink %s: %s",
 287                         sockpath, strerror(errno)
 288                 );
 289                 syslog(LOG_EMERG, "%s", errormessage);
 290                 return(-1);
 291         }
 292
 293         memset(&addr, 0, sizeof(addr));
 294         addr.sun_family = AF_UNIX;
 295         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 296
 297         s = socket(AF_UNIX, SOCK_STREAM, 0);
 298         if (s < 0) {
 299                 snprintf(errormessage, SIZ,
 300                          "citserver: Can't create a socket: %s",
 301                          strerror(errno));
 302                 syslog(LOG_EMERG, "%s", errormessage);
 303                 return(-1);
 304         }
 305
 306         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 307                 snprintf(errormessage, SIZ,
 308                          "citserver: Can't bind: %s",
 309                          strerror(errno));
 310                 syslog(LOG_EMERG, "%s", errormessage);
 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                 snprintf(errormessage, SIZ,
 317                          "citserver: Can't set socket to non-blocking: %s",
 318                          strerror(errno));
 319                 syslog(LOG_EMERG, "%s", errormessage);
 320                 close(s);
 321                 return(-1);
 322         }
 323
 324         if (listen(s, actual_queue_len) < 0) {
 325                 snprintf(errormessage, SIZ,
 326                          "citserver: Can't listen: %s",
 327                          strerror(errno));
 328                 syslog(LOG_EMERG, "%s", errormessage);
 329                 return(-1);
 330         }
 331
 332 #ifdef HAVE_STRUCT_UCRED
 333         setsockopt(s, SOL_SOCKET, SO_PASSCRED, &passcred, sizeof(passcred));
 334 #endif
 335
 336         chmod(sockpath, S_ISGID|S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
 337         return(s);
 338 }
 339
 340
 341
 342 /*
 343  * The following functions implement output buffering on operating systems which
 344  * support it (such as Linux and various BSD flavors).
 345  */
 346 #ifndef HAVE_DARWIN
 347 #ifdef TCP_CORK
 348 #       define HAVE_TCP_BUFFERING
 349 #else
 350 #       ifdef TCP_NOPUSH
 351 #               define HAVE_TCP_BUFFERING
 352 #               define TCP_CORK TCP_NOPUSH
 353 #       endif
 354 #endif /* TCP_CORK */
 355 #endif /* HAVE_DARWIN */
 356
 357 static unsigned on = 1, off = 0;
 358
 359 void buffer_output(void) {
 360 #ifdef HAVE_TCP_BUFFERING
 361 #ifdef HAVE_OPENSSL
 362         if (!CC->redirect_ssl)
 363 #endif
 364                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 365 #endif
 366 }
 367
 368 void unbuffer_output(void) {
 369 #ifdef HAVE_TCP_BUFFERING
 370 #ifdef HAVE_OPENSSL
 371         if (!CC->redirect_ssl)
 372 #endif
 373                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 374 #endif
 375 }
 376
 377 void flush_output(void) {
 378 #ifdef HAVE_TCP_BUFFERING
 379         struct CitContext *CCC = CC;
 380         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 381         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 382 #endif
 383 }
 384
 385 /*
 386 static void flush_client_inbuf(void)
 387 {
 388         CitContext *CCC=CC;
 389
 390         FlushStrBuf(CCC->ReadBuf);
 391         CCC->RecvBuf->ReadWritePointer = NULL;
 392
 393 }
 394 */
 395
 396
 397 /*
 398  * client_close()       ...     close the client socket
 399  */
 400 void client_close(void) {
 401         CitContext *CCC = CC;
 402
 403         if (!CCC) return;
 404         if (CCC->client_socket <= 0) return;
 405         syslog(LOG_DEBUG, "Closing socket %d", CCC->client_socket);
 406
 407         close(CCC->client_socket);
 408         CCC->client_socket = -1 ;
 409 }
 410
 411
 412
 413
 414 /*
 415  * client_write()   ...    Send binary data to the client.
 416  */
 417 int client_write(const char *buf, int nbytes)
 418 {
 419         int bytes_written = 0;
 420         int retval;
 421 #ifndef HAVE_TCP_BUFFERING
 422         int old_buffer_len = 0;
 423 #endif
 424         fd_set wset;
 425         CitContext *Ctx;
 426         int fdflags;
 427
 428         if (nbytes < 1) return(0);
 429
 430         Ctx = CC;
 431
 432 #ifdef BIGBAD_IODBG
 433         {
 434                 int rv = 0;
 435                 char fn [SIZ];
 436                 FILE *fd;
 437
 438                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", Ctx->ServiceName, Ctx->cs_pid);
 439
 440                 fd = fopen(fn, "a+");
 441                 if (fd)
 442                 {
 443                     fprintf(fd, "Sending: BufSize: %d BufContent: [",
 444                             nbytes);
 445                     rv = fwrite(buf, nbytes, 1, fd);
 446                     fprintf(fd, "]\n");
 447                     fclose(fd);
 448                 }
 449         }
 450 #endif
 451 //      flush_client_inbuf();
 452         if (Ctx->redirect_buffer != NULL) {
 453                 StrBufAppendBufPlain(Ctx->redirect_buffer,
 454                                      buf, nbytes, 0);
 455                 return 0;
 456         }
 457
 458 #ifdef HAVE_OPENSSL
 459         if (Ctx->redirect_ssl) {
 460                 client_write_ssl(buf, nbytes);
 461                 return 0;
 462         }
 463 #endif
 464         if (Ctx->client_socket == -1) return -1;
 465
 466         fdflags = fcntl(Ctx->client_socket, F_GETFL);
 467
 468         while ((bytes_written < nbytes) && (Ctx->client_socket != -1)){
 469                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 470                         FD_ZERO(&wset);
 471                         FD_SET(Ctx->client_socket, &wset);
 472                         if (select(1, NULL, &wset, NULL, NULL) == -1) {
 473                                 if (errno == EINTR)
 474                                 {
 475                                         syslog(LOG_DEBUG, "client_write(%d bytes) select() interrupted.",
 476                                                 nbytes-bytes_written
 477                                         );
 478                                         if (server_shutting_down) {
 479                                                 CC->kill_me = KILLME_SELECT_INTERRUPTED;
 480                                                 return (-1);
 481                                         } else {
 482                                                 /* can't trust fd's and stuff so we need to re-create them */
 483                                                 continue;
 484                                         }
 485                                 } else {
 486                                         syslog(LOG_ERR,
 487                                                 "client_write(%d bytes) select failed: %s (%d)",
 488                                                 nbytes - bytes_written,
 489                                                 strerror(errno), errno
 490                                         );
 491                                         cit_backtrace();
 492                                         client_close();
 493                                         Ctx->kill_me = KILLME_SELECT_FAILED;
 494                                         return -1;
 495                                 }
 496                         }
 497                 }
 498
 499                 retval = write(Ctx->client_socket, &buf[bytes_written], nbytes - bytes_written);
 500                 if (retval < 1) {
 501                         syslog(LOG_ERR,
 502                                 "client_write(%d bytes) failed: %s (%d)",
 503                                 nbytes - bytes_written,
 504                                 strerror(errno), errno
 505                         );
 506                         cit_backtrace();
 507                         client_close();
 508                         Ctx->kill_me = KILLME_WRITE_FAILED;
 509                         return -1;
 510                 }
 511                 bytes_written = bytes_written + retval;
 512         }
 513         return 0;
 514 }
 515
 516 void cputbuf(const StrBuf *Buf) {
 517         client_write(ChrPtr(Buf), StrLength(Buf));
 518 }
 519
 520
 521 /*
 522  * cprintf()    Send formatted printable data to the client.
 523  *              Implemented in terms of client_write() so it's technically not sysdep...
 524  */
 525 void cprintf(const char *format, ...) {
 526         va_list arg_ptr;
 527         char buf[1024];
 528
 529         va_start(arg_ptr, format);
 530         if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
 531                 buf[sizeof buf - 2] = '\n';
 532         client_write(buf, strlen(buf));
 533         va_end(arg_ptr);
 534 }
 535
 536
 537 /*
 538  * Read data from the client socket.
 539  *
 540  * sock         socket fd to read from
 541  * buf          buffer to read into
 542  * bytes        number of bytes to read
 543  * timeout      Number of seconds to wait before timing out
 544  *
 545  * Possible return values:
 546  *      1       Requested number of bytes has been read.
 547  *      0       Request timed out.
 548  *      -1      Connection is broken, or other error.
 549  */
 550 int client_read_blob(StrBuf *Target, int bytes, int timeout)
 551 {
 552         CitContext *CCC=CC;
 553         const char *Error;
 554         int retval = 0;
 555
 556 #ifdef HAVE_OPENSSL
 557         if (CCC->redirect_ssl) {
 558 #ifdef BIGBAD_IODBG
 559                 int rv = 0;
 560                 char fn [SIZ];
 561                 FILE *fd;
 562
 563                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 564
 565                 fd = fopen(fn, "a+");
 566                 fprintf(fd, "Reading BLOB: BufSize: %d ",
 567                         bytes);
 568                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 569                 fprintf(fd, "]\n");
 570
 571
 572                 fclose(fd);
 573 #endif
 574                 retval = client_read_sslblob(Target, bytes, timeout);
 575                 if (retval < 0) {
 576                         syslog(LOG_CRIT, "client_read_blob() failed");
 577                 }
 578 #ifdef BIGBAD_IODBG
 579                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 580
 581                 fd = fopen(fn, "a+");
 582                 fprintf(fd, "Read: %d BufContent: [",
 583                         StrLength(Target));
 584                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 585                 fprintf(fd, "]\n");
 586
 587
 588                 fclose(fd);
 589 #endif
 590         }
 591         else
 592 #endif
 593         {
 594 #ifdef BIGBAD_IODBG
 595                 int rv = 0;
 596                 char fn [SIZ];
 597                 FILE *fd;
 598
 599                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 600
 601                 fd = fopen(fn, "a+");
 602                 fprintf(fd, "Reading BLOB: BufSize: %d ",
 603                         bytes);
 604                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 605                 fprintf(fd, "]\n");
 606
 607
 608                 fclose(fd);
 609 #endif
 610                 retval = StrBufReadBLOBBuffered(Target,
 611                                                 CCC->RecvBuf.Buf,
 612                                                 &CCC->RecvBuf.ReadWritePointer,
 613                                                 &CCC->client_socket,
 614                                                 1,
 615                                                 bytes,
 616                                                 O_TERM,
 617                                                 &Error);
 618                 if (retval < 0) {
 619                         syslog(LOG_CRIT, "client_read_blob() failed: %s", Error);
 620                         client_close();
 621                         return retval;
 622                 }
 623 #ifdef BIGBAD_IODBG
 624                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 625
 626                 fd = fopen(fn, "a+");
 627                 fprintf(fd, "Read: %d BufContent: [",
 628                         StrLength(Target));
 629                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 630                 fprintf(fd, "]\n");
 631                 fclose(fd);
 632 #endif
 633         }
 634         return retval;
 635 }
 636
 637
 638 /*
 639  * to make client_read_random_blob() more efficient, increase buffer size.
 640  * just use in greeting function, else your buffer may be flushed
 641  */
 642 void client_set_inbound_buf(long N)
 643 {
 644         CitContext *CCC=CC;
 645         FlushStrBuf(CCC->RecvBuf.Buf);
 646         ReAdjustEmptyBuf(CCC->RecvBuf.Buf, N * SIZ, N * SIZ);
 647 }
 648
 649 int client_read_random_blob(StrBuf *Target, int timeout)
 650 {
 651         CitContext *CCC=CC;
 652         int rc;
 653
 654         rc =  client_read_blob(Target, 1, timeout);
 655         if (rc > 0)
 656         {
 657                 long len;
 658                 const char *pch;
 659
 660                 len = StrLength(CCC->RecvBuf.Buf);
 661                 pch = ChrPtr(CCC->RecvBuf.Buf);
 662
 663                 if (len > 0)
 664                 {
 665                         if (CCC->RecvBuf.ReadWritePointer != NULL) {
 666                                 len -= CCC->RecvBuf.ReadWritePointer - pch;
 667                                 pch = CCC->RecvBuf.ReadWritePointer;
 668                         }
 669                         StrBufAppendBufPlain(Target, pch, len, 0);
 670                         FlushStrBuf(CCC->RecvBuf.Buf);
 671                         CCC->RecvBuf.ReadWritePointer = NULL;
 672 #ifdef BIGBAD_IODBG
 673                         {
 674                                 int rv = 0;
 675                                 char fn [SIZ];
 676                                 FILE *fd;
 677
 678                                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 679
 680                                 fd = fopen(fn, "a+");
 681                                 fprintf(fd, "Read: BufSize: %d BufContent: [",
 682                                         StrLength(Target));
 683                                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 684                                 fprintf(fd, "]\n");
 685
 686
 687                                 fclose(fd);
 688                         }
 689 #endif
 690
 691                         return StrLength(Target);
 692                 }
 693                 return rc;
 694         }
 695         else
 696                 return rc;
 697 }
 698
 699 int client_read_to(char *buf, int bytes, int timeout)
 700 {
 701         CitContext *CCC=CC;
 702         int rc;
 703
 704         rc = client_read_blob(CCC->MigrateBuf, bytes, timeout);
 705         if (rc < 0)
 706         {
 707                 *buf = '\0';
 708                 return rc;
 709         }
 710         else
 711         {
 712                 memcpy(buf,
 713                        ChrPtr(CCC->MigrateBuf),
 714                        StrLength(CCC->MigrateBuf) + 1);
 715                 FlushStrBuf(CCC->MigrateBuf);
 716                 return rc;
 717         }
 718 }
 719
 720
 721 int HaveMoreLinesWaiting(CitContext *CCC)
 722 {
 723         if ((CCC->kill_me != 0) ||
 724             ( (CCC->RecvBuf.ReadWritePointer == NULL) &&
 725               (StrLength(CCC->RecvBuf.Buf) == 0) &&
 726               (CCC->client_socket != -1)) )
 727                 return 0;
 728         else
 729                 return 1;
 730 }
 731
 732
 733 /*
 734  * Read data from the client socket with default timeout.
 735  * (This is implemented in terms of client_read_to() and could be
 736  * justifiably moved out of sysdep.c)
 737  */
 738 INLINE int client_read(char *buf, int bytes)
 739 {
 740         return(client_read_to(buf, bytes, config.c_sleeping));
 741 }
 742
 743 int CtdlClientGetLine(StrBuf *Target)
 744 {
 745         CitContext *CCC=CC;
 746         const char *Error;
 747         int rc;
 748
 749         FlushStrBuf(Target);
 750 #ifdef HAVE_OPENSSL
 751         if (CCC->redirect_ssl) {
 752 #ifdef BIGBAD_IODBG
 753                 char fn [SIZ];
 754                 FILE *fd;
 755                 int len = 0;
 756                 int rlen = 0;
 757                 int  nlen = 0;
 758                 int nrlen = 0;
 759                 const char *pch;
 760
 761                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 762
 763                 fd = fopen(fn, "a+");
 764                 pch = ChrPtr(CCC->RecvBuf.Buf);
 765                 len = StrLength(CCC->RecvBuf.Buf);
 766                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 767                         rlen = CCC->RecvBuf.ReadWritePointer - pch;
 768                 else
 769                         rlen = 0;
 770
 771 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 772                         len, rlen, pch);
 773 */
 774                 fprintf(fd, "\n\n\nSSL1: BufSize: %d BufPos: %d \n_____________________\n",
 775                         len, rlen);
 776 #endif
 777                 rc = client_readline_sslbuffer(Target,
 778                                                CCC->RecvBuf.Buf,
 779                                                &CCC->RecvBuf.ReadWritePointer,
 780                                                1);
 781 #ifdef BIGBAD_IODBG
 782                 pch = ChrPtr(CCC->RecvBuf.Buf);
 783                 nlen = StrLength(CCC->RecvBuf.Buf);
 784                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 785                         nrlen = CCC->RecvBuf.ReadWritePointer - pch;
 786                 else
 787                         nrlen = 0;
 788 /*
 789                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 790                         len, nlen, rlen, nrlen, pch);
 791 */
 792                 fprintf(fd, "\n\n\nSSL2: BufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 793                         len, nlen, rlen, nrlen);
 794
 795                 fprintf(fd, "SSL3: Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 796                         StrLength(Target), ChrPtr(Target));
 797                 fclose(fd);
 798
 799                 if (rc < 0) {
 800                         syslog(LOG_CRIT, "CtdlClientGetLine() failed");
 801                 }
 802 #endif
 803                 return rc;
 804         }
 805         else
 806 #endif
 807         {
 808 #ifdef BIGBAD_IODBG
 809                 char fn [SIZ];
 810                 FILE *fd;
 811                 int len, rlen, nlen, nrlen;
 812                 const char *pch;
 813
 814                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 815
 816                 fd = fopen(fn, "a+");
 817                 pch = ChrPtr(CCC->RecvBuf.Buf);
 818                 len = StrLength(CCC->RecvBuf.Buf);
 819                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 820                         rlen = CCC->RecvBuf.ReadWritePointer - pch;
 821                 else
 822                         rlen = 0;
 823
 824 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 825                         len, rlen, pch);
 826 */
 827                 fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \n_____________________\n",
 828                         len, rlen);
 829 #endif
 830                 rc = StrBufTCP_read_buffered_line_fast(Target,
 831                                                        CCC->RecvBuf.Buf,
 832                                                        &CCC->RecvBuf.ReadWritePointer,
 833                                                        &CCC->client_socket,
 834                                                        5,
 835                                                        1,
 836                                                        &Error);
 837
 838 #ifdef BIGBAD_IODBG
 839                 pch = ChrPtr(CCC->RecvBuf.Buf);
 840                 nlen = StrLength(CCC->RecvBuf.Buf);
 841                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 842                         nrlen = CCC->RecvBuf.ReadWritePointer - pch;
 843                 else
 844                         nrlen = 0;
 845 /*
 846                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 847                         len, nlen, rlen, nrlen, pch);
 848 */
 849                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 850                         len, nlen, rlen, nrlen);
 851
 852                 fprintf(fd, "Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 853                         StrLength(Target), ChrPtr(Target));
 854                 fclose(fd);
 855
 856                 if ((rc < 0) && (Error != NULL)) {
 857                         syslog(LOG_CRIT, "CtdlClientGetLine() failed: %s", Error);
 858                 }
 859 #endif
 860                 return rc;
 861         }
 862 }
 863
 864
 865 /*
 866  * client_getln()   ...   Get a LF-terminated line of text from the client.
 867  * (This is implemented in terms of client_read() and could be
 868  * justifiably moved out of sysdep.c)
 869  */
 870 int client_getln(char *buf, int bufsize)
 871 {
 872         int i, retval;
 873         CitContext *CCC=CC;
 874         const char *pCh;
 875
 876         retval = CtdlClientGetLine(CCC->MigrateBuf);
 877         if (retval < 0)
 878           return(retval >= 0);
 879
 880
 881         i = StrLength(CCC->MigrateBuf);
 882         pCh = ChrPtr(CCC->MigrateBuf);
 883         /* Strip the trailing LF, and the trailing CR if present.
 884          */
 885         if (bufsize <= i)
 886                 i = bufsize - 1;
 887         while ( (i > 0)
 888                 && ( (pCh[i - 1]==13)
 889                      || ( pCh[i - 1]==10)) ) {
 890                 i--;
 891         }
 892         memcpy(buf, pCh, i);
 893         buf[i] = 0;
 894
 895         FlushStrBuf(CCC->MigrateBuf);
 896         if (retval < 0) {
 897                 safestrncpy(&buf[i], "000", bufsize - i);
 898         }
 899         return(retval >= 0);
 900 }
 901
 902
 903 /*
 904  * Cleanup any contexts that are left lying around
 905  */
 906
 907
 908 void close_masters (void)
 909 {
 910         struct ServiceFunctionHook *serviceptr;
 911         const char *Text;
 912
 913         /*
 914          * close all protocol master sockets
 915          */
 916         for (serviceptr = ServiceHookTable; serviceptr != NULL;
 917             serviceptr = serviceptr->next ) {
 918
 919                 if (serviceptr->tcp_port > 0)
 920                 {
 921                         if (serviceptr->msock == -1)
 922                                 Text = "not closing again";
 923                         else
 924                                 Text = "Closing";
 925
 926                         syslog(LOG_INFO, "%s %d listener on port %d\n",
 927                                Text,
 928                                serviceptr->msock,
 929                                serviceptr->tcp_port);
 930                         serviceptr->tcp_port = 0;
 931                 }
 932
 933                 if (serviceptr->sockpath != NULL)
 934                 {
 935                         if (serviceptr->msock == -1)
 936                                 Text = "not closing again";
 937                         else
 938                                 Text = "Closing";
 939
 940                         syslog(LOG_INFO, "%s %d listener on '%s'\n",
 941                                Text,
 942                                serviceptr->msock,
 943                                serviceptr->sockpath);
 944                 }
 945
 946                 if (serviceptr->msock != -1)
 947                 {
 948                         close(serviceptr->msock);
 949                         serviceptr->msock = -1;
 950                 }
 951
 952                 /* If it's a Unix domain socket, remove the file. */
 953                 if (serviceptr->sockpath != NULL) {
 954                         unlink(serviceptr->sockpath);
 955                         serviceptr->sockpath = NULL;
 956                 }
 957         }
 958 }
 959
 960
 961 /*
 962  * The system-dependent part of master_cleanup() - close the master socket.
 963  */
 964 void sysdep_master_cleanup(void) {
 965
 966         close_masters();
 967
 968         context_cleanup();
 969
 970 #ifdef HAVE_OPENSSL
 971         destruct_ssl();
 972 #endif
 973         CtdlDestroyProtoHooks();
 974         CtdlDestroyDeleteHooks();
 975         CtdlDestroyXmsgHooks();
 976         CtdlDestroyNetprocHooks();
 977         CtdlDestroyUserHooks();
 978         CtdlDestroyMessageHook();
 979         CtdlDestroyCleanupHooks();
 980         CtdlDestroyFixedOutputHooks();
 981         CtdlDestroySessionHooks();
 982         CtdlDestroyTDAPVetoHooks();
 983         CtdlDestroyServiceHook();
 984         CtdlDestroyRoomHooks();
 985         CtdlDestroySearchHooks();
 986         CtdlDestroyDebugTable();
 987         #ifdef HAVE_BACKTRACE
 988 ///     eCrash_Uninit();
 989         #endif
 990 }
 991
 992
 993
 994 pid_t current_child;
 995 void graceful_shutdown(int signum) {
 996         kill(current_child, signum);
 997         unlink(file_pid_file);
 998         exit(0);
 999 }
1000
1001 int nFireUps = 0;
1002 int nFireUpsNonRestart = 0;
1003 pid_t ForkedPid = 1;
1004
1005 /*
1006  * Start running as a daemon.
1007  */
1008 void start_daemon(int unused) {
1009         int status = 0;
1010         pid_t child = 0;
1011         FILE *fp;
1012         int do_restart = 0;
1013
1014         current_child = 0;
1015
1016         /* Close stdin/stdout/stderr and replace them with /dev/null.
1017          * We don't just call close() because we don't want these fd's
1018          * to be reused for other files.
1019          */
1020         if (chdir(ctdl_run_dir) != 0)
1021                 syslog(LOG_EMERG,
1022                               "unable to change into directory [%s]: %s",
1023                               ctdl_run_dir, strerror(errno));
1024
1025         child = fork();
1026         if (child != 0) {
1027                 exit(0);
1028         }
1029
1030         signal(SIGHUP, SIG_IGN);
1031         signal(SIGINT, SIG_IGN);
1032         signal(SIGQUIT, SIG_IGN);
1033
1034         setsid();
1035         umask(0);
1036         if ((freopen("/dev/null", "r", stdin) != stdin) ||
1037             (freopen("/dev/null", "w", stdout) != stdout) ||
1038             (freopen("/dev/null", "w", stderr) != stderr))
1039                 syslog(LOG_EMERG,
1040                               "unable to reopen stdin/out/err %s",
1041                               strerror(errno));
1042
1043
1044         do {
1045                 current_child = fork();
1046
1047                 signal(SIGTERM, graceful_shutdown);
1048
1049                 if (current_child < 0) {
1050                         perror("fork");
1051                         exit(errno);
1052                 }
1053
1054                 else if (current_child == 0) {
1055                         return; /* continue starting citadel. */
1056                 }
1057
1058                 else {
1059                         fp = fopen(file_pid_file, "w");
1060                         if (fp != NULL) {
1061                                 fprintf(fp, ""F_PID_T"\n", getpid());
1062                                 fclose(fp);
1063                         }
1064                         waitpid(current_child, &status, 0);
1065                 }
1066
1067                 nFireUpsNonRestart = nFireUps;
1068
1069                 /* Exit code 0 means the watcher should exit */
1070                 if (WIFEXITED(status) && (WEXITSTATUS(status) == CTDLEXIT_SHUTDOWN)) {
1071                         do_restart = 0;
1072                 }
1073
1074                 /* Exit code 101-109 means the watcher should exit */
1075                 else if (WIFEXITED(status) && (WEXITSTATUS(status) >= 101) && (WEXITSTATUS(status) <= 109)) {
1076                         do_restart = 0;
1077                 }
1078
1079                 /* Any other exit code, or no exit code, means we should restart. */
1080                 else {
1081                         do_restart = 1;
1082                         nFireUps++;
1083                         ForkedPid = current_child;
1084                 }
1085
1086         } while (do_restart);
1087
1088         unlink(file_pid_file);
1089         exit(WEXITSTATUS(status));
1090 }
1091
1092
1093
1094 void checkcrash(void)
1095 {
1096         if (nFireUpsNonRestart != nFireUps)
1097         {
1098                 StrBuf *CrashMail;
1099
1100                 CrashMail = NewStrBuf();
1101                 syslog(LOG_ALERT, "Posting crash message\n");
1102                 StrBufPrintf(CrashMail,
1103                         " \n"
1104                         " The Citadel server process (citserver) terminated unexpectedly."
1105                         "\n \n"
1106                         " This could be the result of a bug in the server program, or some external "
1107                         "factor.\n \n"
1108                         " You can obtain more information about this by enabling core dumps.\n \n"
1109                         " For more information, please see:\n \n"
1110                         " http://citadel.org/doku.php?id=faq:mastering_your_os:gdb#how.do.i.make.my.system.produce.core-files"
1111                         "\n \n"
1112
1113                         " If you have already done this, the core dump is likely to be found at %score.%d\n"
1114                         ,
1115                         ctdl_run_dir, ForkedPid);
1116                 CtdlAideMessage(ChrPtr(CrashMail), "Citadel server process terminated unexpectedly");
1117                 FreeStrBuf(&CrashMail);
1118         }
1119 }
1120
1121
1122 /*
1123  * Generic routine to convert a login name to a full name (gecos)
1124  * Returns nonzero if a conversion took place
1125  */
1126 int convert_login(char NameToConvert[]) {
1127         struct passwd *pw;
1128         int a;
1129
1130         pw = getpwnam(NameToConvert);
1131         if (pw == NULL) {
1132                 return(0);
1133         }
1134         else {
1135                 strcpy(NameToConvert, pw->pw_gecos);
1136                 for (a=0; a<strlen(NameToConvert); ++a) {
1137                         if (NameToConvert[a] == ',') NameToConvert[a] = 0;
1138                 }
1139                 return(1);
1140         }
1141 }
1142
1143
1144
1145 /*
1146  * This loop just keeps going and going and going...
1147  */
1148 void *worker_thread(void *blah) {
1149         int highest;
1150         CitContext *ptr;
1151         CitContext *bind_me = NULL;
1152         fd_set readfds;
1153         int retval = 0;
1154         struct timeval tv;
1155         int force_purge = 0;
1156         struct ServiceFunctionHook *serviceptr;
1157         int ssock;                      /* Descriptor for client socket */
1158         CitContext *con = NULL;         /* Temporary context pointer */
1159         int i;
1160
1161         pthread_mutex_lock(&ThreadCountMutex);
1162         ++num_workers;
1163         pthread_mutex_unlock(&ThreadCountMutex);
1164
1165         while (!server_shutting_down) {
1166
1167                 /* make doubly sure we're not holding any stale db handles
1168                  * which might cause a deadlock.
1169                  */
1170                 cdb_check_handles();
1171 do_select:      force_purge = 0;
1172                 bind_me = NULL;         /* Which session shall we handle? */
1173
1174                 /* Initialize the fdset. */
1175                 FD_ZERO(&readfds);
1176                 highest = 0;
1177
1178                 /* First, add the various master sockets to the fdset. */
1179                 for (serviceptr = ServiceHookTable; serviceptr != NULL; serviceptr = serviceptr->next ) {
1180                         FD_SET(serviceptr->msock, &readfds);
1181                         if (serviceptr->msock > highest) {
1182                                 highest = serviceptr->msock;
1183                         }
1184                 }
1185
1186                 /* Next, add all of the client sockets. */
1187                 begin_critical_section(S_SESSION_TABLE);
1188                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1189                         if ((ptr->state == CON_SYS) && (ptr->client_socket == 0))
1190                             continue;
1191
1192                         /* Don't select on dead sessions, only truly idle ones */
1193                         if (    (ptr->state == CON_IDLE)
1194                                 && (ptr->kill_me == 0)
1195                                 && (ptr->client_socket > 0)
1196                         ) {
1197                                 FD_SET(ptr->client_socket, &readfds);
1198                                 if (ptr->client_socket > highest)
1199                                         highest = ptr->client_socket;
1200                         }
1201                         if ((bind_me == NULL) && (ptr->state == CON_READY)) {
1202                                 bind_me = ptr;
1203                                 ptr->state = CON_EXECUTING;
1204                                 break;
1205                         }
1206                         if ((bind_me == NULL) && (ptr->state == CON_GREETING)) {
1207                                 bind_me = ptr;
1208                                 ptr->state = CON_STARTING;
1209                                 break;
1210                         }
1211                 }
1212                 end_critical_section(S_SESSION_TABLE);
1213
1214                 if (bind_me) {
1215                         goto SKIP_SELECT;
1216                 }
1217
1218                 /* If we got this far, it means that there are no sessions
1219                  * which a previous thread marked for attention, so we go
1220                  * ahead and get ready to select().
1221                  */
1222
1223                 if (!server_shutting_down) {
1224                         tv.tv_sec = 1;          /* wake up every second if no input */
1225                         tv.tv_usec = 0;
1226                         retval = select(highest + 1, &readfds, NULL, NULL, &tv);
1227                 }
1228                 else {
1229                         --num_workers;
1230                         return NULL;
1231                 }
1232
1233                 /* Now figure out who made this select() unblock.
1234                  * First, check for an error or exit condition.
1235                  */
1236                 if (retval < 0) {
1237                         if (errno == EBADF) {
1238                                 syslog(LOG_NOTICE, "select() failed: (%s)\n", strerror(errno));
1239                                 goto do_select;
1240                         }
1241                         if (errno != EINTR) {
1242                                 syslog(LOG_EMERG, "Exiting (%s)\n", strerror(errno));
1243                                 server_shutting_down = 1;
1244                                 continue;
1245                         } else {
1246 #if 0
1247                                 syslog(LOG_DEBUG, "Interrupted select()\n");
1248 #endif
1249                                 if (server_shutting_down) {
1250                                         --num_workers;
1251                                         return(NULL);
1252                                 }
1253                                 goto do_select;
1254                         }
1255                 }
1256                 else if (retval == 0) {
1257                         if (server_shutting_down) {
1258                                 --num_workers;
1259                                 return(NULL);
1260                         }
1261                 }
1262
1263                 /* Next, check to see if it's a new client connecting * on a master socket. */
1264
1265                 else if ((retval > 0) && (!server_shutting_down)) for (serviceptr = ServiceHookTable; serviceptr != NULL; serviceptr = serviceptr->next) {
1266
1267                         if (FD_ISSET(serviceptr->msock, &readfds)) {
1268                                 ssock = accept(serviceptr->msock, NULL, 0);
1269                                 if (ssock >= 0) {
1270                                         syslog(LOG_DEBUG, "New client socket %d", ssock);
1271
1272                                         /* The master socket is non-blocking but the client
1273                                          * sockets need to be blocking, otherwise certain
1274                                          * operations barf on FreeBSD.  Not a fatal error.
1275                                          */
1276                                         if (fcntl(ssock, F_SETFL, 0) < 0) {
1277                                                 syslog(LOG_EMERG,
1278                                                         "citserver: Can't set socket to blocking: %s\n",
1279                                                         strerror(errno));
1280                                         }
1281
1282                                         /* New context will be created already
1283                                          * set up in the CON_EXECUTING state.
1284                                          */
1285                                         con = CreateNewContext();
1286
1287                                         /* Assign our new socket number to it. */
1288                                         con->tcp_port = serviceptr->tcp_port;
1289                                         con->client_socket = ssock;
1290                                         con->h_command_function = serviceptr->h_command_function;
1291                                         con->h_async_function = serviceptr->h_async_function;
1292                                         con->h_greeting_function = serviceptr->h_greeting_function;
1293                                         con->ServiceName = serviceptr->ServiceName;
1294
1295                                         /* Determine whether it's a local socket */
1296                                         if (serviceptr->sockpath != NULL) {
1297                                                 con->is_local_socket = 1;
1298                                         }
1299
1300                                         /* Set the SO_REUSEADDR socket option */
1301                                         i = 1;
1302                                         setsockopt(ssock, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
1303                                         con->state = CON_GREETING;
1304                                         retval--;
1305                                         if (retval == 0)
1306                                                 break;
1307                                 }
1308                         }
1309                 }
1310
1311                 /* It must be a client socket.  Find a context that has data
1312                  * waiting on its socket *and* is in the CON_IDLE state.  Any
1313                  * active sockets other than our chosen one are marked as
1314                  * CON_READY so the next thread that comes around can just bind
1315                  * to one without having to select() again.
1316                  */
1317                 begin_critical_section(S_SESSION_TABLE);
1318                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1319                         int checkfd = ptr->client_socket;
1320                         if ((checkfd != -1) && (ptr->state == CON_IDLE) ){
1321                                 if (FD_ISSET(checkfd, &readfds)) {
1322                                         ptr->input_waiting = 1;
1323                                         if (!bind_me) {
1324                                                 bind_me = ptr;  /* I choose you! */
1325                                                 bind_me->state = CON_EXECUTING;
1326                                         }
1327                                         else {
1328                                                 ptr->state = CON_READY;
1329                                         }
1330                                 } else if ((ptr->is_async) && (ptr->async_waiting) && (ptr->h_async_function)) {
1331                                         if (!bind_me) {
1332                                                 bind_me = ptr;  /* I choose you! */
1333                                                 bind_me->state = CON_EXECUTING;
1334                                         }
1335                                         else {
1336                                                 ptr->state = CON_READY;
1337                                         }
1338                                 }
1339                         }
1340                 }
1341                 end_critical_section(S_SESSION_TABLE);
1342
1343 SKIP_SELECT:
1344                 /* We're bound to a session */
1345                 pthread_mutex_lock(&ThreadCountMutex);
1346                 ++active_workers;
1347                 pthread_mutex_unlock(&ThreadCountMutex);
1348
1349                 if (bind_me != NULL) {
1350                         become_session(bind_me);
1351
1352                         if (bind_me->state == CON_STARTING) {
1353                                 bind_me->state = CON_EXECUTING;
1354                                 begin_session(bind_me);
1355                                 bind_me->h_greeting_function();
1356                         }
1357                         /* If the client has sent a command, execute it. */
1358                         if (CC->input_waiting) {
1359                                 CC->h_command_function();
1360
1361                                 while (HaveMoreLinesWaiting(CC))
1362                                        CC->h_command_function();
1363
1364                                 CC->input_waiting = 0;
1365                         }
1366
1367                         /* If there are asynchronous messages waiting and the
1368                          * client supports it, do those now */
1369                         if ((CC->is_async) && (CC->async_waiting)
1370                            && (CC->h_async_function != NULL)) {
1371                                 CC->h_async_function();
1372                                 CC->async_waiting = 0;
1373                         }
1374
1375                         force_purge = CC->kill_me;
1376                         become_session(NULL);
1377                         bind_me->state = CON_IDLE;
1378                 }
1379
1380                 dead_session_purge(force_purge);
1381                 do_housekeeping();
1382
1383                 pthread_mutex_lock(&ThreadCountMutex);
1384                 --active_workers;
1385                 if ((active_workers + config.c_min_workers < num_workers) &&
1386                     (num_workers > config.c_min_workers))
1387                 {
1388                         num_workers--;
1389                         pthread_mutex_unlock(&ThreadCountMutex);
1390                         return (NULL);
1391                 }
1392                 pthread_mutex_unlock(&ThreadCountMutex);
1393         }
1394
1395         /* If control reaches this point, the server is shutting down */
1396         pthread_mutex_lock(&ThreadCountMutex);
1397         --num_workers;
1398         pthread_mutex_unlock(&ThreadCountMutex);
1399         return(NULL);
1400 }
1401
1402
1403
1404 /*
1405  * SyslogFacility()
1406  * Translate text facility name to syslog.h defined value.
1407  */
1408 int SyslogFacility(char *name)
1409 {
1410         int i;
1411         struct
1412         {
1413                 int facility;
1414                 char *name;
1415         }   facTbl[] =
1416         {
1417                 {   LOG_KERN,   "kern"          },
1418                 {   LOG_USER,   "user"          },
1419                 {   LOG_MAIL,   "mail"          },
1420                 {   LOG_DAEMON, "daemon"        },
1421                 {   LOG_AUTH,   "auth"          },
1422                 {   LOG_SYSLOG, "syslog"        },
1423                 {   LOG_LPR,    "lpr"           },
1424                 {   LOG_NEWS,   "news"          },
1425                 {   LOG_UUCP,   "uucp"          },
1426                 {   LOG_LOCAL0, "local0"        },
1427                 {   LOG_LOCAL1, "local1"        },
1428                 {   LOG_LOCAL2, "local2"        },
1429                 {   LOG_LOCAL3, "local3"        },
1430                 {   LOG_LOCAL4, "local4"        },
1431                 {   LOG_LOCAL5, "local5"        },
1432                 {   LOG_LOCAL6, "local6"        },
1433                 {   LOG_LOCAL7, "local7"        },
1434                 {   0,            NULL          }
1435         };
1436         for(i = 0; facTbl[i].name != NULL; i++) {
1437                 if(!strcasecmp(name, facTbl[i].name))
1438                         return facTbl[i].facility;
1439         }
1440         return LOG_DAEMON;
1441 }