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  * might need tweaking when run on different operating system variants.
   6  *
   7  * Copyright (c) 1987-2017 by the citadel.org team
   8  *
   9  * This program is open source software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License, version 3.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include "sysdep.h"
  19 #include <stdlib.h>
  20 #include <unistd.h>
  21 #include <sys/stat.h>
  22 #include <errno.h>
  23 #include <signal.h>
  24 #include <stdio.h>
  25 #include <syslog.h>
  26 #include <sys/syslog.h>
  27 #include <netdb.h>
  28 #include <sys/un.h>
  29 #include <sys/types.h>
  30 #include <sys/socket.h>
  31 #include <netinet/in.h>
  32 #include <arpa/inet.h>
  33 #include <netinet/tcp.h>
  34 #include <arpa/inet.h>
  35 #define SHOW_ME_VAPPEND_PRINTF
  36 #include <libcitadel.h>
  37 #include "citserver.h"
  38 #include "config.h"
  39 #include "ctdl_module.h"
  40 #include "sysdep_decls.h"
  41 #include "modules/crypto/serv_crypto.h" /* Needed for init_ssl, client_write_ssl, client_read_ssl, destruct_ssl */
  42 #include "housekeeping.h"
  43 #include "context.h"
  44
  45 /*
  46  * Signal handler to shut down the server.
  47  */
  48
  49 volatile int exit_signal = 0;
  50 volatile int shutdown_and_halt = 0;
  51 volatile int restart_server = 0;
  52 volatile int running_as_daemon = 0;
  53
  54
  55 static RETSIGTYPE signal_cleanup(int signum) {
  56         syslog(LOG_DEBUG, "sysdep: caught signal %d; shutting down.", signum);
  57         exit_signal = signum;
  58         server_shutting_down = 1;
  59 }
  60
  61
  62 static RETSIGTYPE signal_exit(int signum) {
  63         exit(1);
  64 }
  65
  66
  67 /*
  68  * Some initialization stuff...
  69  */
  70 void init_sysdep(void) {
  71         sigset_t set;
  72
  73         /* Avoid vulnerabilities related to FD_SETSIZE if we can. */
  74 #ifdef FD_SETSIZE
  75 #ifdef RLIMIT_NOFILE
  76         struct rlimit rl;
  77         getrlimit(RLIMIT_NOFILE, &rl);
  78         rl.rlim_cur = FD_SETSIZE;
  79         rl.rlim_max = FD_SETSIZE;
  80         setrlimit(RLIMIT_NOFILE, &rl);
  81 #endif
  82 #endif
  83
  84         /* If we've got OpenSSL, we're going to use it. */
  85 #ifdef HAVE_OPENSSL
  86         init_ssl();
  87 #endif
  88
  89         /*
  90          * Set up a place to put thread-specific data.
  91          * We only need a single pointer per thread - it points to the
  92          * CitContext structure (in the ContextList linked list) of the
  93          * session to which the calling thread is currently bound.
  94          */
  95         if (pthread_key_create(&MyConKey, NULL) != 0) {
  96                 syslog(LOG_CRIT, "sysdep: can't create TSD key: %m");
  97         }
  98
  99         /*
 100          * Interript, hangup, and terminate signals should cause the server
 101          * to gracefully clean up and shut down.
 102          */
 103         sigemptyset(&set);
 104         sigaddset(&set, SIGINT);
 105         sigaddset(&set, SIGHUP);
 106         sigaddset(&set, SIGTERM);
 107         sigprocmask(SIG_UNBLOCK, &set, NULL);
 108
 109         signal(SIGINT, signal_cleanup);
 110         signal(SIGHUP, signal_cleanup);
 111         signal(SIGTERM, signal_cleanup);
 112         signal(SIGUSR2, signal_exit);
 113
 114         /*
 115          * Do not shut down the server on broken pipe signals, otherwise the
 116          * whole Citadel service would come down whenever a single client
 117          * socket breaks.
 118          */
 119         signal(SIGPIPE, SIG_IGN);
 120 }
 121
 122
 123 /*
 124  * This is a generic function to set up a master socket for listening on
 125  * a TCP port.  The server shuts down if the bind fails.  (IPv4/IPv6 version)
 126  *
 127  * ip_addr      IP address to bind
 128  * port_number  port number to bind
 129  * queue_len    number of incoming connections to allow in the queue
 130  */
 131 int ctdl_tcp_server(char *ip_addr, int port_number, int queue_len, char *errormessage)
 132 {
 133         struct protoent *p;
 134         struct sockaddr_in6 sin6;
 135         struct sockaddr_in sin4;
 136         int s, i, b;
 137         int ip_version = 6;
 138
 139         memset(&sin6, 0, sizeof(sin6));
 140         memset(&sin4, 0, sizeof(sin4));
 141         sin6.sin6_family = AF_INET6;
 142         sin4.sin_family = AF_INET;
 143
 144         if (    (ip_addr == NULL)                                                       /* any IPv6 */
 145                 || (IsEmptyStr(ip_addr))
 146                 || (!strcmp(ip_addr, "*"))
 147         ) {
 148                 ip_version = 6;
 149                 sin6.sin6_addr = in6addr_any;
 150         }
 151         else if (!strcmp(ip_addr, "0.0.0.0"))                                           /* any IPv4 */
 152         {
 153                 ip_version = 4;
 154                 sin4.sin_addr.s_addr = INADDR_ANY;
 155         }
 156         else if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':')))                     /* specific IPv4 */
 157         {
 158                 ip_version = 4;
 159                 if (inet_pton(AF_INET, ip_addr, &sin4.sin_addr) <= 0) {
 160                         snprintf(errormessage, SIZ, "Error binding to [%s] : %s", ip_addr, strerror(errno));
 161                         syslog(LOG_ALERT, "tcpserver: %s", errormessage);
 162                         return (-1);
 163                 }
 164         }
 165         else                                                                            /* specific IPv6 */
 166         {
 167                 ip_version = 6;
 168                 if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
 169                         snprintf(errormessage, SIZ, "Error binding to [%s] : %s", ip_addr, strerror(errno));
 170                         syslog(LOG_ALERT, "tcpserver: %s", errormessage);
 171                         return (-1);
 172                 }
 173         }
 174
 175         if (port_number == 0) {
 176                 snprintf(errormessage, SIZ, "Can't start: no port number specified.");
 177                 syslog(LOG_ALERT, "tcpserver: %s", errormessage);
 178                 return (-1);
 179         }
 180         sin6.sin6_port = htons((u_short) port_number);
 181         sin4.sin_port = htons((u_short) port_number);
 182
 183         p = getprotobyname("tcp");
 184
 185         s = socket( ((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
 186         if (s < 0) {
 187                 snprintf(errormessage, SIZ, "Can't create a listening socket: %s", strerror(errno));
 188                 syslog(LOG_ALERT, "tcpserver: %s", errormessage);
 189                 return (-1);
 190         }
 191         /* Set some socket options that make sense. */
 192         i = 1;
 193         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 194
 195         if (ip_version == 6) {
 196                 b = bind(s, (struct sockaddr *) &sin6, sizeof(sin6));
 197         }
 198         else {
 199                 b = bind(s, (struct sockaddr *) &sin4, sizeof(sin4));
 200         }
 201
 202         if (b < 0) {
 203                 snprintf(errormessage, SIZ, "Can't bind: %s", strerror(errno));
 204                 syslog(LOG_ALERT, "tcpserver: %s", errormessage);
 205                 return (-1);
 206         }
 207
 208         fcntl(s, F_SETFL, O_NONBLOCK);
 209
 210         if (listen(s, ((queue_len >= 5) ? queue_len : 5) ) < 0) {
 211                 snprintf(errormessage, SIZ, "Can't listen: %s", strerror(errno));
 212                 syslog(LOG_ALERT, "tcpserver: %s", errormessage);
 213                 return (-1);
 214         }
 215         return (s);
 216 }
 217
 218
 219 /*
 220  * Create a Unix domain socket and listen on it
 221  */
 222 int ctdl_uds_server(char *sockpath, int queue_len, char *errormessage)
 223 {
 224         struct sockaddr_un addr;
 225         int s;
 226         int i;
 227         int actual_queue_len;
 228 #ifdef HAVE_STRUCT_UCRED
 229         int passcred = 1;
 230 #endif
 231
 232         actual_queue_len = queue_len;
 233         if (actual_queue_len < 5) actual_queue_len = 5;
 234
 235         i = unlink(sockpath);
 236         if ((i != 0) && (errno != ENOENT)) {
 237                 snprintf(errormessage, SIZ, "can't unlink %s: %s", sockpath, strerror(errno));
 238                 syslog(LOG_ERR, "udsserver: %s", errormessage);
 239                 return(-1);
 240         }
 241
 242         memset(&addr, 0, sizeof(addr));
 243         addr.sun_family = AF_UNIX;
 244         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 245
 246         s = socket(AF_UNIX, SOCK_STREAM, 0);
 247         if (s < 0) {
 248                 snprintf(errormessage, SIZ, "can't create a socket: %s", strerror(errno));
 249                 syslog(LOG_ERR, "udsserver: %s", errormessage);
 250                 return(-1);
 251         }
 252
 253         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 254                 snprintf(errormessage, SIZ, "can't bind: %s", strerror(errno));
 255                 syslog(LOG_ERR, "udsserver: %s", errormessage);
 256                 return(-1);
 257         }
 258
 259         /* set to nonblock - we need this for some obscure situations */
 260         if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
 261                 snprintf(errormessage, SIZ, "can't set socket to non-blocking: %s", strerror(errno));
 262                 syslog(LOG_ERR, "udsserver: %s", errormessage);
 263                 close(s);
 264                 return(-1);
 265         }
 266
 267         if (listen(s, actual_queue_len) < 0) {
 268                 snprintf(errormessage, SIZ, "can't listen: %s", strerror(errno));
 269                 syslog(LOG_ERR, "udsserver: %s", errormessage);
 270                 return(-1);
 271         }
 272
 273 #ifdef HAVE_STRUCT_UCRED
 274         setsockopt(s, SOL_SOCKET, SO_PASSCRED, &passcred, sizeof(passcred));
 275 #endif
 276
 277         chmod(sockpath, S_ISGID|S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
 278         return(s);
 279 }
 280
 281
 282 /*
 283  * The following functions implement output buffering on operating systems which
 284  * support it (such as Linux and various BSD flavors).
 285  */
 286 #ifndef HAVE_DARWIN
 287 #ifdef TCP_CORK
 288 #       define HAVE_TCP_BUFFERING
 289 #else
 290 #       ifdef TCP_NOPUSH
 291 #               define HAVE_TCP_BUFFERING
 292 #               define TCP_CORK TCP_NOPUSH
 293 #       endif
 294 #endif /* TCP_CORK */
 295 #endif /* HAVE_DARWIN */
 296
 297 static unsigned on = 1, off = 0;
 298
 299 void buffer_output(void) {
 300 #ifdef HAVE_TCP_BUFFERING
 301 #ifdef HAVE_OPENSSL
 302         if (!CC->redirect_ssl)
 303 #endif
 304                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 305 #endif
 306 }
 307
 308 void unbuffer_output(void) {
 309 #ifdef HAVE_TCP_BUFFERING
 310 #ifdef HAVE_OPENSSL
 311         if (!CC->redirect_ssl)
 312 #endif
 313                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 314 #endif
 315 }
 316
 317 void flush_output(void) {
 318 #ifdef HAVE_TCP_BUFFERING
 319         struct CitContext *CCC = CC;
 320         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 321         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 322 #endif
 323 }
 324
 325 /*
 326 static void flush_client_inbuf(void)
 327 {
 328         CitContext *CCC=CC;
 329
 330         FlushStrBuf(CCC->ReadBuf);
 331         CCC->RecvBuf->ReadWritePointer = NULL;
 332 }
 333 */
 334
 335
 336 /*
 337  * client_close()       ...     close the client socket
 338  */
 339 void client_close(void) {
 340         CitContext *CCC = CC;
 341
 342         if (!CCC) return;
 343         if (CCC->client_socket <= 0) return;
 344         syslog(LOG_DEBUG, "sysdep: closing socket %d", CCC->client_socket);
 345         close(CCC->client_socket);
 346         CCC->client_socket = -1 ;
 347 }
 348
 349
 350 /*
 351  * client_write()   ...    Send binary data to the client.
 352  */
 353 int client_write(const char *buf, int nbytes)
 354 {
 355         int bytes_written = 0;
 356         int retval;
 357 #ifndef HAVE_TCP_BUFFERING
 358         int old_buffer_len = 0;
 359 #endif
 360         fd_set wset;
 361         CitContext *Ctx;
 362         int fdflags;
 363
 364         if (nbytes < 1) return(0);
 365
 366         Ctx = CC;
 367
 368 #ifdef BIGBAD_IODBG
 369         {
 370                 int rv = 0;
 371                 char fn [SIZ];
 372                 FILE *fd;
 373
 374                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", Ctx->ServiceName, Ctx->cs_pid);
 375
 376                 fd = fopen(fn, "a+");
 377                 if (fd == NULL) {
 378                         syslog(LOG_ERR, "%s: %m", fn);
 379                         cit_backtrace();
 380                         exit(1);
 381                 }
 382                 fprintf(fd, "Sending: BufSize: %d BufContent: [", nbytes);
 383                 rv = fwrite(buf, nbytes, 1, fd);
 384                 fprintf(fd, "]\n");
 385                 fclose(fd);
 386         }
 387 #endif
 388 //      flush_client_inbuf();
 389         if (Ctx->redirect_buffer != NULL) {
 390                 StrBufAppendBufPlain(Ctx->redirect_buffer,
 391                                      buf, nbytes, 0);
 392                 return 0;
 393         }
 394
 395 #ifdef HAVE_OPENSSL
 396         if (Ctx->redirect_ssl) {
 397                 client_write_ssl(buf, nbytes);
 398                 return 0;
 399         }
 400 #endif
 401         if (Ctx->client_socket == -1) return -1;
 402
 403         fdflags = fcntl(Ctx->client_socket, F_GETFL);
 404
 405         while ((bytes_written < nbytes) && (Ctx->client_socket != -1)){
 406                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 407                         FD_ZERO(&wset);
 408                         FD_SET(Ctx->client_socket, &wset);
 409                         if (select(1, NULL, &wset, NULL, NULL) == -1) {
 410                                 if (errno == EINTR)
 411                                 {
 412                                         syslog(LOG_DEBUG, "sysdep: client_write(%d bytes) select() interrupted.", nbytes-bytes_written);
 413                                         if (server_shutting_down) {
 414                                                 CC->kill_me = KILLME_SELECT_INTERRUPTED;
 415                                                 return (-1);
 416                                         } else {
 417                                                 /* can't trust fd's and stuff so we need to re-create them */
 418                                                 continue;
 419                                         }
 420                                 } else {
 421                                         syslog(LOG_ERR, "sysdep: client_write(%d bytes) select failed: %m", nbytes - bytes_written);
 422                                         cit_backtrace();
 423                                         client_close();
 424                                         Ctx->kill_me = KILLME_SELECT_FAILED;
 425                                         return -1;
 426                                 }
 427                         }
 428                 }
 429
 430                 retval = write(Ctx->client_socket, &buf[bytes_written], nbytes - bytes_written);
 431                 if (retval < 1) {
 432                         syslog(LOG_ERR, "sysdep: client_write(%d bytes) failed: %m", nbytes - bytes_written);
 433                         cit_backtrace();
 434                         client_close();
 435                         Ctx->kill_me = KILLME_WRITE_FAILED;
 436                         return -1;
 437                 }
 438                 bytes_written = bytes_written + retval;
 439         }
 440         return 0;
 441 }
 442
 443 void cputbuf(const StrBuf *Buf) {
 444         client_write(ChrPtr(Buf), StrLength(Buf));
 445 }
 446
 447
 448 /*
 449  * cprintf()    Send formatted printable data to the client.
 450  *              Implemented in terms of client_write() so it's technically not sysdep...
 451  */
 452 void cprintf(const char *format, ...) {
 453         va_list arg_ptr;
 454         char buf[1024];
 455
 456         va_start(arg_ptr, format);
 457         if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
 458                 buf[sizeof buf - 2] = '\n';
 459         client_write(buf, strlen(buf));
 460         va_end(arg_ptr);
 461 }
 462
 463
 464 /*
 465  * Read data from the client socket.
 466  *
 467  * sock         socket fd to read from
 468  * buf          buffer to read into
 469  * bytes        number of bytes to read
 470  * timeout      Number of seconds to wait before timing out
 471  *
 472  * Possible return values:
 473  *      1       Requested number of bytes has been read.
 474  *      0       Request timed out.
 475  *      -1      Connection is broken, or other error.
 476  */
 477 int client_read_blob(StrBuf *Target, int bytes, int timeout)
 478 {
 479         CitContext *CCC=CC;
 480         const char *Error;
 481         int retval = 0;
 482
 483 #ifdef HAVE_OPENSSL
 484         if (CCC->redirect_ssl) {
 485 #ifdef BIGBAD_IODBG
 486                 int rv = 0;
 487                 char fn [SIZ];
 488                 FILE *fd;
 489
 490                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 491
 492                 fd = fopen(fn, "a+");
 493                 if (fd == NULL) {
 494                         syslog(LOG_ERR, "%s: %m", fn);
 495                         cit_backtrace();
 496                         exit(1);
 497                 }
 498                 fprintf(fd, "Reading BLOB: BufSize: %d ", bytes);
 499                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 500                 fprintf(fd, "]\n");
 501
 502
 503                 fclose(fd);
 504 #endif
 505                 retval = client_read_sslblob(Target, bytes, timeout);
 506                 if (retval < 0) {
 507                         syslog(LOG_ERR, "sysdep: client_read_blob() failed");
 508                 }
 509 #ifdef BIGBAD_IODBG
 510                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 511
 512                 fd = fopen(fn, "a+");
 513                 if (fd == NULL) {
 514                         syslog(LOG_ERR, "%s: %m", fn);
 515                         cit_backtrace();
 516                         exit(1);
 517                 }
 518                 fprintf(fd, "Read: %d BufContent: [", StrLength(Target));
 519                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 520                 fprintf(fd, "]\n");
 521                 fclose(fd);
 522 #endif
 523         }
 524         else
 525 #endif
 526         {
 527 #ifdef BIGBAD_IODBG
 528                 int rv = 0;
 529                 char fn [SIZ];
 530                 FILE *fd;
 531
 532                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 533
 534                 fd = fopen(fn, "a+");
 535                 if (fd == NULL) {
 536                         syslog(LOG_ERR, "%s: %m", fn);
 537                         cit_backtrace();
 538                         exit(1);
 539                 }
 540                 fprintf(fd, "Reading BLOB: BufSize: %d ",
 541                         bytes);
 542                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 543                 fprintf(fd, "]\n");
 544                 fclose(fd);
 545 #endif
 546                 retval = StrBufReadBLOBBuffered(Target,
 547                                                 CCC->RecvBuf.Buf,
 548                                                 &CCC->RecvBuf.ReadWritePointer,
 549                                                 &CCC->client_socket,
 550                                                 1,
 551                                                 bytes,
 552                                                 O_TERM,
 553                                                 &Error
 554                 );
 555                 if (retval < 0) {
 556                         syslog(LOG_ERR, "sysdep: client_read_blob() failed: %s", Error);
 557                         client_close();
 558                         return retval;
 559                 }
 560 #ifdef BIGBAD_IODBG
 561                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 562
 563                 fd = fopen(fn, "a+");
 564                 if (fd == NULL) {
 565                         syslog(LOG_ERR, "%s: %m", fn);
 566                         cit_backtrace();
 567                         exit(1);
 568                 }
 569                 fprintf(fd, "Read: %d BufContent: [",
 570                         StrLength(Target));
 571                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 572                 fprintf(fd, "]\n");
 573                 fclose(fd);
 574 #endif
 575         }
 576         return retval;
 577 }
 578
 579
 580 /*
 581  * to make client_read_random_blob() more efficient, increase buffer size.
 582  * just use in greeting function, else your buffer may be flushed
 583  */
 584 void client_set_inbound_buf(long N)
 585 {
 586         CitContext *CCC=CC;
 587         FlushStrBuf(CCC->RecvBuf.Buf);
 588         ReAdjustEmptyBuf(CCC->RecvBuf.Buf, N * SIZ, N * SIZ);
 589 }
 590
 591 int client_read_random_blob(StrBuf *Target, int timeout)
 592 {
 593         CitContext *CCC=CC;
 594         int rc;
 595
 596         rc =  client_read_blob(Target, 1, timeout);
 597         if (rc > 0)
 598         {
 599                 long len;
 600                 const char *pch;
 601
 602                 len = StrLength(CCC->RecvBuf.Buf);
 603                 pch = ChrPtr(CCC->RecvBuf.Buf);
 604
 605                 if (len > 0)
 606                 {
 607                         if (CCC->RecvBuf.ReadWritePointer != NULL) {
 608                                 len -= CCC->RecvBuf.ReadWritePointer - pch;
 609                                 pch = CCC->RecvBuf.ReadWritePointer;
 610                         }
 611                         StrBufAppendBufPlain(Target, pch, len, 0);
 612                         FlushStrBuf(CCC->RecvBuf.Buf);
 613                         CCC->RecvBuf.ReadWritePointer = NULL;
 614 #ifdef BIGBAD_IODBG
 615                         {
 616                                 int rv = 0;
 617                                 char fn [SIZ];
 618                                 FILE *fd;
 619
 620                                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 621
 622                                 fd = fopen(fn, "a+");
 623                                 if (fd == NULL) {
 624                                         syslog(LOG_ERR, "%s: %m", fn);
 625                                         cit_backtrace();
 626                                         exit(1);
 627                                 }
 628                                 fprintf(fd, "Read: BufSize: %d BufContent: [",
 629                                         StrLength(Target));
 630                                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 631                                 fprintf(fd, "]\n");
 632                                 fclose(fd);
 633                         }
 634 #endif
 635                         return StrLength(Target);
 636                 }
 637                 return rc;
 638         }
 639         else
 640                 return rc;
 641 }
 642
 643 int client_read_to(char *buf, int bytes, int timeout)
 644 {
 645         CitContext *CCC=CC;
 646         int rc;
 647
 648         rc = client_read_blob(CCC->MigrateBuf, bytes, timeout);
 649         if (rc < 0)
 650         {
 651                 *buf = '\0';
 652                 return rc;
 653         }
 654         else
 655         {
 656                 memcpy(buf,
 657                        ChrPtr(CCC->MigrateBuf),
 658                        StrLength(CCC->MigrateBuf) + 1);
 659                 FlushStrBuf(CCC->MigrateBuf);
 660                 return rc;
 661         }
 662 }
 663
 664
 665 int HaveMoreLinesWaiting(CitContext *CCC)
 666 {
 667         if ((CCC->kill_me != 0) ||
 668             ( (CCC->RecvBuf.ReadWritePointer == NULL) &&
 669               (StrLength(CCC->RecvBuf.Buf) == 0) &&
 670               (CCC->client_socket != -1)) )
 671                 return 0;
 672         else
 673                 return 1;
 674 }
 675
 676
 677 /*
 678  * Read data from the client socket with default timeout.
 679  * (This is implemented in terms of client_read_to() and could be
 680  * justifiably moved out of sysdep.c)
 681  */
 682 INLINE int client_read(char *buf, int bytes)
 683 {
 684         return(client_read_to(buf, bytes, CtdlGetConfigInt("c_sleeping")));
 685 }
 686
 687 int CtdlClientGetLine(StrBuf *Target)
 688 {
 689         CitContext *CCC=CC;
 690         const char *Error;
 691         int rc;
 692
 693         FlushStrBuf(Target);
 694 #ifdef HAVE_OPENSSL
 695         if (CCC->redirect_ssl) {
 696 #ifdef BIGBAD_IODBG
 697                 char fn [SIZ];
 698                 FILE *fd;
 699                 int len = 0;
 700                 int rlen = 0;
 701                 int  nlen = 0;
 702                 int nrlen = 0;
 703                 const char *pch;
 704
 705                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 706
 707                 fd = fopen(fn, "a+");
 708                 if (fd == NULL) {
 709                         syslog(LOG_ERR, "%s: %m", fn);
 710                         cit_backtrace();
 711                         exit(1);
 712                 }
 713                 pch = ChrPtr(CCC->RecvBuf.Buf);
 714                 len = StrLength(CCC->RecvBuf.Buf);
 715                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 716                         rlen = CCC->RecvBuf.ReadWritePointer - pch;
 717                 else
 718                         rlen = 0;
 719
 720 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 721                         len, rlen, pch);
 722 */
 723                 fprintf(fd, "\n\n\nSSL1: BufSize: %d BufPos: %d \n_____________________\n",
 724                         len, rlen);
 725 #endif
 726                 rc = client_readline_sslbuffer(Target,
 727                                                CCC->RecvBuf.Buf,
 728                                                &CCC->RecvBuf.ReadWritePointer,
 729                                                1);
 730 #ifdef BIGBAD_IODBG
 731                 pch = ChrPtr(CCC->RecvBuf.Buf);
 732                 nlen = StrLength(CCC->RecvBuf.Buf);
 733                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 734                         nrlen = CCC->RecvBuf.ReadWritePointer - pch;
 735                 else
 736                         nrlen = 0;
 737 /*
 738                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 739                         len, nlen, rlen, nrlen, pch);
 740 */
 741                 fprintf(fd, "\n\n\nSSL2: BufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 742                         len, nlen, rlen, nrlen);
 743
 744                 fprintf(fd, "SSL3: Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 745                         StrLength(Target), ChrPtr(Target));
 746                 fclose(fd);
 747
 748                 if (rc < 0) {
 749                         syslog(LOG_ERR, "sysdep: CtdlClientGetLine() failed");
 750                 }
 751 #endif
 752                 return rc;
 753         }
 754         else
 755 #endif
 756         {
 757 #ifdef BIGBAD_IODBG
 758                 char fn [SIZ];
 759                 FILE *fd;
 760                 int len, rlen, nlen, nrlen;
 761                 const char *pch;
 762
 763                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 764
 765                 fd = fopen(fn, "a+");
 766                 if (fd == NULL) {
 767                         syslog(LOG_ERR, "%s: %m", fn);
 768                         cit_backtrace();
 769                         exit(1);
 770                 }
 771                 pch = ChrPtr(CCC->RecvBuf.Buf);
 772                 len = StrLength(CCC->RecvBuf.Buf);
 773                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 774                         rlen = CCC->RecvBuf.ReadWritePointer - pch;
 775                 else
 776                         rlen = 0;
 777
 778 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 779                         len, rlen, pch);
 780 */
 781                 fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \n_____________________\n",
 782                         len, rlen);
 783 #endif
 784                 rc = StrBufTCP_read_buffered_line_fast(Target,
 785                                                        CCC->RecvBuf.Buf,
 786                                                        &CCC->RecvBuf.ReadWritePointer,
 787                                                        &CCC->client_socket,
 788                                                        5,
 789                                                        1,
 790                                                        &Error
 791                 );
 792
 793 #ifdef BIGBAD_IODBG
 794                 pch = ChrPtr(CCC->RecvBuf.Buf);
 795                 nlen = StrLength(CCC->RecvBuf.Buf);
 796                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 797                         nrlen = CCC->RecvBuf.ReadWritePointer - pch;
 798                 else
 799                         nrlen = 0;
 800 /*
 801                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 802                         len, nlen, rlen, nrlen, pch);
 803 */
 804                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 805                         len, nlen, rlen, nrlen);
 806
 807                 fprintf(fd, "Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 808                         StrLength(Target), ChrPtr(Target));
 809                 fclose(fd);
 810
 811                 if ((rc < 0) && (Error != NULL)) {
 812                         syslog(LOG_ERR, "sysdep: CtdlClientGetLine() failed: %s", Error);
 813                 }
 814 #endif
 815                 return rc;
 816         }
 817 }
 818
 819
 820 /*
 821  * client_getln()   ...   Get a LF-terminated line of text from the client.
 822  * (This is implemented in terms of client_read() and could be
 823  * justifiably moved out of sysdep.c)
 824  */
 825 int client_getln(char *buf, int bufsize)
 826 {
 827         int i, retval;
 828         CitContext *CCC=CC;
 829         const char *pCh;
 830
 831         retval = CtdlClientGetLine(CCC->MigrateBuf);
 832         if (retval < 0)
 833           return(retval >= 0);
 834
 835
 836         i = StrLength(CCC->MigrateBuf);
 837         pCh = ChrPtr(CCC->MigrateBuf);
 838         /* Strip the trailing LF, and the trailing CR if present.
 839          */
 840         if (bufsize <= i)
 841                 i = bufsize - 1;
 842         while ( (i > 0)
 843                 && ( (pCh[i - 1]==13)
 844                      || ( pCh[i - 1]==10)) ) {
 845                 i--;
 846         }
 847         memcpy(buf, pCh, i);
 848         buf[i] = 0;
 849
 850         FlushStrBuf(CCC->MigrateBuf);
 851         if (retval < 0) {
 852                 safestrncpy(&buf[i], "000", bufsize - i);
 853         }
 854         return(retval >= 0);
 855 }
 856
 857
 858 /*
 859  * Cleanup any contexts that are left lying around
 860  */
 861
 862
 863 void close_masters (void)
 864 {
 865         struct ServiceFunctionHook *serviceptr;
 866         const char *Text;
 867
 868         /*
 869          * close all protocol master sockets
 870          */
 871         for (serviceptr = ServiceHookTable; serviceptr != NULL;
 872             serviceptr = serviceptr->next ) {
 873
 874                 if (serviceptr->tcp_port > 0)
 875                 {
 876                         if (serviceptr->msock == -1) {
 877                                 Text = "not closing again";
 878                         }
 879                         else {
 880                                 Text = "Closing";
 881                         }
 882                         syslog(LOG_INFO, "sysdep: %s %d listener on port %d",
 883                                Text,
 884                                serviceptr->msock,
 885                                serviceptr->tcp_port
 886                         );
 887                         serviceptr->tcp_port = 0;
 888                 }
 889
 890                 if (serviceptr->sockpath != NULL)
 891                 {
 892                         if (serviceptr->msock == -1) {
 893                                 Text = "not closing again";
 894                         }
 895                         else {
 896                                 Text = "Closing";
 897                         }
 898                         syslog(LOG_INFO, "sysdep: %s %d listener on '%s'",
 899                                Text,
 900                                serviceptr->msock,
 901                                serviceptr->sockpath
 902                         );
 903                 }
 904
 905                 if (serviceptr->msock != -1)
 906                 {
 907                         close(serviceptr->msock);
 908                         serviceptr->msock = -1;
 909                 }
 910
 911                 /* If it's a Unix domain socket, remove the file. */
 912                 if (serviceptr->sockpath != NULL) {
 913                         unlink(serviceptr->sockpath);
 914                         serviceptr->sockpath = NULL;
 915                 }
 916         }
 917 }
 918
 919
 920 /*
 921  * The system-dependent part of master_cleanup() - close the master socket.
 922  */
 923 void sysdep_master_cleanup(void) {
 924
 925         close_masters();
 926
 927         context_cleanup();
 928
 929 #ifdef HAVE_OPENSSL
 930         destruct_ssl();
 931 #endif
 932         CtdlDestroyProtoHooks();
 933         CtdlDestroyDeleteHooks();
 934         CtdlDestroyXmsgHooks();
 935         CtdlDestroyNetprocHooks();
 936         CtdlDestroyUserHooks();
 937         CtdlDestroyMessageHook();
 938         CtdlDestroyCleanupHooks();
 939         CtdlDestroyFixedOutputHooks();
 940         CtdlDestroySessionHooks();
 941         CtdlDestroyServiceHook();
 942         CtdlDestroyRoomHooks();
 943         CtdlDestroySearchHooks();
 944         #ifdef HAVE_BACKTRACE
 945 ///     eCrash_Uninit();
 946         #endif
 947 }
 948
 949
 950
 951 pid_t current_child;
 952 void graceful_shutdown(int signum) {
 953         kill(current_child, signum);
 954         unlink(file_pid_file);
 955         exit(0);
 956 }
 957
 958 int nFireUps = 0;
 959 int nFireUpsNonRestart = 0;
 960 pid_t ForkedPid = 1;
 961
 962 /*
 963  * Start running as a daemon.
 964  */
 965 void start_daemon(int unused) {
 966         int status = 0;
 967         pid_t child = 0;
 968         FILE *fp;
 969         int do_restart = 0;
 970
 971         current_child = 0;
 972
 973         /* Close stdin/stdout/stderr and replace them with /dev/null.
 974          * We don't just call close() because we don't want these fd's
 975          * to be reused for other files.
 976          */
 977         if (chdir(ctdl_run_dir) != 0) {
 978                 syslog(LOG_ERR, "%s: %m", ctdl_run_dir);
 979         }
 980
 981         child = fork();
 982         if (child != 0) {
 983                 exit(0);
 984         }
 985
 986         signal(SIGHUP, SIG_IGN);
 987         signal(SIGINT, SIG_IGN);
 988         signal(SIGQUIT, SIG_IGN);
 989
 990         setsid();
 991         umask(0);
 992         if (    (freopen("/dev/null", "r", stdin) != stdin) ||
 993                 (freopen("/dev/null", "w", stdout) != stdout) ||
 994                 (freopen("/dev/null", "w", stderr) != stderr)
 995         ) {
 996                 syslog(LOG_ERR, "sysdep: unable to reopen stdio: %m");
 997         }
 998
 999         do {
1000                 current_child = fork();
1001                 signal(SIGTERM, graceful_shutdown);
1002                 if (current_child < 0) {
1003                         perror("fork");
1004                         exit(errno);
1005                 }
1006                 else if (current_child == 0) {
1007                         return; /* continue starting citadel. */
1008                 }
1009                 else {
1010                         fp = fopen(file_pid_file, "w");
1011                         if (fp != NULL) {
1012                                 fprintf(fp, ""F_PID_T"\n", getpid());
1013                                 fclose(fp);
1014                         }
1015                         waitpid(current_child, &status, 0);
1016                 }
1017                 nFireUpsNonRestart = nFireUps;
1018
1019                 /* Exit code 0 means the watcher should exit */
1020                 if (WIFEXITED(status) && (WEXITSTATUS(status) == CTDLEXIT_SHUTDOWN)) {
1021                         do_restart = 0;
1022                 }
1023
1024                 /* Exit code 101-109 means the watcher should exit */
1025                 else if (WIFEXITED(status) && (WEXITSTATUS(status) >= 101) && (WEXITSTATUS(status) <= 109)) {
1026                         do_restart = 0;
1027                 }
1028
1029                 /* Any other exit code, or no exit code, means we should restart. */
1030                 else {
1031                         do_restart = 1;
1032                         nFireUps++;
1033                         ForkedPid = current_child;
1034                 }
1035
1036         } while (do_restart);
1037
1038         unlink(file_pid_file);
1039         exit(WEXITSTATUS(status));
1040 }
1041
1042
1043
1044 void checkcrash(void)
1045 {
1046         if (nFireUpsNonRestart != nFireUps)
1047         {
1048                 StrBuf *CrashMail;
1049                 CrashMail = NewStrBuf();
1050                 syslog(LOG_ALERT, "sysdep: posting crash message");
1051                 StrBufPrintf(CrashMail,
1052                         " \n"
1053                         " The Citadel server process (citserver) terminated unexpectedly."
1054                         "\n \n"
1055                         " This could be the result of a bug in the server program, or some external "
1056                         "factor.\n \n"
1057                         " You can obtain more information about this by enabling core dumps.\n \n"
1058                         " For more information, please see:\n \n"
1059                         " http://citadel.org/doku.php?id=faq:mastering_your_os:gdb#how.do.i.make.my.system.produce.core-files"
1060                         "\n \n"
1061
1062                         " If you have already done this, the core dump is likely to be found at %score.%d\n"
1063                         ,
1064                         ctdl_run_dir, ForkedPid);
1065                 CtdlAideMessage(ChrPtr(CrashMail), "Citadel server process terminated unexpectedly");
1066                 FreeStrBuf(&CrashMail);
1067         }
1068 }
1069
1070
1071 /*
1072  * Generic routine to convert a login name to a full name (gecos)
1073  * Returns nonzero if a conversion took place
1074  */
1075 int convert_login(char NameToConvert[]) {
1076         struct passwd *pw;
1077         unsigned int a;
1078
1079         pw = getpwnam(NameToConvert);
1080         if (pw == NULL) {
1081                 return(0);
1082         }
1083         else {
1084                 strcpy(NameToConvert, pw->pw_gecos);
1085                 for (a=0; a<strlen(NameToConvert); ++a) {
1086                         if (NameToConvert[a] == ',') NameToConvert[a] = 0;
1087                 }
1088                 return(1);
1089         }
1090 }
1091
1092
1093
1094 void HuntBadSession(void)
1095 {
1096         int highest;
1097         CitContext *ptr;
1098         fd_set readfds;
1099         struct timeval tv;
1100         struct ServiceFunctionHook *serviceptr;
1101
1102         /* Next, add all of the client sockets. */
1103         begin_critical_section(S_SESSION_TABLE);
1104         for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1105                 if ((ptr->state == CON_SYS) && (ptr->client_socket == 0))
1106                         continue;
1107                 /* Initialize the fdset. */
1108                 FD_ZERO(&readfds);
1109                 highest = 0;
1110                 tv.tv_sec = 0;          /* wake up every second if no input */
1111                 tv.tv_usec = 0;
1112
1113                 /* Don't select on dead sessions, only truly idle ones */
1114                 if (    (ptr->state == CON_IDLE)
1115                         && (ptr->kill_me == 0)
1116                         && (ptr->client_socket > 0)
1117                 ) {
1118                         FD_SET(ptr->client_socket, &readfds);
1119                         if (ptr->client_socket > highest)
1120                                 highest = ptr->client_socket;
1121
1122                         if ((select(highest + 1, &readfds, NULL, NULL, &tv) < 0) && (errno == EBADF))
1123                         {
1124                                 /* Gotcha! */
1125                                 syslog(LOG_ERR,
1126                                        "sysdep: killing session CC[%d] bad FD: [%d:%d] User[%s] Host[%s:%s]",
1127                                        ptr->cs_pid,
1128                                        ptr->client_socket,
1129                                        ptr->is_local_socket,
1130                                        ptr->curr_user,
1131                                        ptr->cs_host,ptr->cs_addr
1132                                 );
1133                                 ptr->kill_me = 1;
1134                                 ptr->client_socket = -1;
1135                                 break;
1136                         }
1137                 }
1138         }
1139         end_critical_section(S_SESSION_TABLE);
1140
1141         /* First, add the various master sockets to the fdset. */
1142         for (serviceptr = ServiceHookTable; serviceptr != NULL; serviceptr = serviceptr->next ) {
1143
1144                 /* Initialize the fdset. */
1145                 highest = 0;
1146                 tv.tv_sec = 0;          /* wake up every second if no input */
1147                 tv.tv_usec = 0;
1148
1149                 FD_SET(serviceptr->msock, &readfds);
1150                 if (serviceptr->msock > highest) {
1151                         highest = serviceptr->msock;
1152                 }
1153                 if ((select(highest + 1, &readfds, NULL, NULL, &tv) < 0) &&
1154                     (errno == EBADF))
1155                 {
1156                         /* Gotcha! server socket dead? commit suicide! */
1157                         syslog(LOG_ERR, "sysdep: found bad FD: %d and its a server socket! Shutting Down!", serviceptr->msock);
1158                         server_shutting_down = 1;
1159                         break;
1160                 }
1161         }
1162 }
1163
1164
1165 /*
1166  * This loop just keeps going and going and going...
1167  */
1168 void *worker_thread(void *blah) {
1169         int highest;
1170         CitContext *ptr;
1171         CitContext *bind_me = NULL;
1172         fd_set readfds;
1173         int retval = 0;
1174         struct timeval tv;
1175         int force_purge = 0;
1176         struct ServiceFunctionHook *serviceptr;
1177         int ssock;                      /* Descriptor for client socket */
1178         CitContext *con = NULL;         /* Temporary context pointer */
1179         int i;
1180
1181         pthread_mutex_lock(&ThreadCountMutex);
1182         ++num_workers;
1183         pthread_mutex_unlock(&ThreadCountMutex);
1184
1185         while (!server_shutting_down) {
1186
1187                 /* make doubly sure we're not holding any stale db handles * which might cause a deadlock */
1188                 cdb_check_handles();
1189 do_select:      force_purge = 0;
1190                 bind_me = NULL;         /* Which session shall we handle? */
1191
1192                 /* Initialize the fdset. */
1193                 FD_ZERO(&readfds);
1194                 highest = 0;
1195
1196                 /* First, add the various master sockets to the fdset. */
1197                 for (serviceptr = ServiceHookTable; serviceptr != NULL; serviceptr = serviceptr->next ) {
1198                         FD_SET(serviceptr->msock, &readfds);
1199                         if (serviceptr->msock > highest) {
1200                                 highest = serviceptr->msock;
1201                         }
1202                 }
1203
1204                 /* Next, add all of the client sockets. */
1205                 begin_critical_section(S_SESSION_TABLE);
1206                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1207                         if ((ptr->state == CON_SYS) && (ptr->client_socket == 0))
1208                             continue;
1209
1210                         /* Don't select on dead sessions, only truly idle ones */
1211                         if (    (ptr->state == CON_IDLE)
1212                                 && (ptr->kill_me == 0)
1213                                 && (ptr->client_socket > 0)
1214                         ) {
1215                                 FD_SET(ptr->client_socket, &readfds);
1216                                 if (ptr->client_socket > highest)
1217                                         highest = ptr->client_socket;
1218                         }
1219                         if ((bind_me == NULL) && (ptr->state == CON_READY)) {
1220                                 bind_me = ptr;
1221                                 ptr->state = CON_EXECUTING;
1222                                 break;
1223                         }
1224                         if ((bind_me == NULL) && (ptr->state == CON_GREETING)) {
1225                                 bind_me = ptr;
1226                                 ptr->state = CON_STARTING;
1227                                 break;
1228                         }
1229                 }
1230                 end_critical_section(S_SESSION_TABLE);
1231
1232                 if (bind_me) {
1233                         goto SKIP_SELECT;
1234                 }
1235
1236                 /* If we got this far, it means that there are no sessions
1237                  * which a previous thread marked for attention, so we go
1238                  * ahead and get ready to select().
1239                  */
1240
1241                 if (!server_shutting_down) {
1242                         tv.tv_sec = 1;          /* wake up every second if no input */
1243                         tv.tv_usec = 0;
1244                         retval = select(highest + 1, &readfds, NULL, NULL, &tv);
1245                 }
1246                 else {
1247                         --num_workers;
1248                         return NULL;
1249                 }
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                                 syslog(LOG_ERR, "sysdep: select() failed: %m");
1257                                 HuntBadSession();
1258                                 goto do_select;
1259                         }
1260                         if (errno != EINTR) {
1261                                 syslog(LOG_ERR, "sysdep: exiting: %m");
1262                                 server_shutting_down = 1;
1263                                 continue;
1264                         } else {
1265                                 if (server_shutting_down) {
1266                                         --num_workers;
1267                                         return(NULL);
1268                                 }
1269                                 goto do_select;
1270                         }
1271                 }
1272                 else if (retval == 0) {
1273                         if (server_shutting_down) {
1274                                 --num_workers;
1275                                 return(NULL);
1276                         }
1277                 }
1278
1279                 /* Next, check to see if it's a new client connecting on a master socket. */
1280
1281                 else if ((retval > 0) && (!server_shutting_down)) for (serviceptr = ServiceHookTable; serviceptr != NULL; serviceptr = serviceptr->next) {
1282
1283                         if (FD_ISSET(serviceptr->msock, &readfds)) {
1284                                 ssock = accept(serviceptr->msock, NULL, 0);
1285                                 if (ssock >= 0) {
1286                                         syslog(LOG_DEBUG, "sysdep: new client socket %d", ssock);
1287
1288                                         /* The master socket is non-blocking but the client
1289                                          * sockets need to be blocking, otherwise certain
1290                                          * operations barf on FreeBSD.  Not a fatal error.
1291                                          */
1292                                         if (fcntl(ssock, F_SETFL, 0) < 0) {
1293                                                 syslog(LOG_ERR, "sysdep: Can't set socket to blocking: %m");
1294                                         }
1295
1296                                         /* New context will be created already
1297                                          * set up in the CON_EXECUTING state.
1298                                          */
1299                                         con = CreateNewContext();
1300
1301                                         /* Assign our new socket number to it. */
1302                                         con->tcp_port = serviceptr->tcp_port;
1303                                         con->client_socket = ssock;
1304                                         con->h_command_function = serviceptr->h_command_function;
1305                                         con->h_async_function = serviceptr->h_async_function;
1306                                         con->h_greeting_function = serviceptr->h_greeting_function;
1307                                         con->ServiceName = serviceptr->ServiceName;
1308
1309                                         /* Determine whether it's a local socket */
1310                                         if (serviceptr->sockpath != NULL) {
1311                                                 con->is_local_socket = 1;
1312                                         }
1313
1314                                         /* Set the SO_REUSEADDR socket option */
1315                                         i = 1;
1316                                         setsockopt(ssock, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
1317                                         con->state = CON_GREETING;
1318                                         retval--;
1319                                         if (retval == 0)
1320                                                 break;
1321                                 }
1322                         }
1323                 }
1324
1325                 /* It must be a client socket.  Find a context that has data
1326                  * waiting on its socket *and* is in the CON_IDLE state.  Any
1327                  * active sockets other than our chosen one are marked as
1328                  * CON_READY so the next thread that comes around can just bind
1329                  * to one without having to select() again.
1330                  */
1331                 begin_critical_section(S_SESSION_TABLE);
1332                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1333                         int checkfd = ptr->client_socket;
1334                         if ((checkfd != -1) && (ptr->state == CON_IDLE) ){
1335                                 if (FD_ISSET(checkfd, &readfds)) {
1336                                         ptr->input_waiting = 1;
1337                                         if (!bind_me) {
1338                                                 bind_me = ptr;  /* I choose you! */
1339                                                 bind_me->state = CON_EXECUTING;
1340                                         }
1341                                         else {
1342                                                 ptr->state = CON_READY;
1343                                         }
1344                                 } else if ((ptr->is_async) && (ptr->async_waiting) && (ptr->h_async_function)) {
1345                                         if (!bind_me) {
1346                                                 bind_me = ptr;  /* I choose you! */
1347                                                 bind_me->state = CON_EXECUTING;
1348                                         }
1349                                         else {
1350                                                 ptr->state = CON_READY;
1351                                         }
1352                                 }
1353                         }
1354                 }
1355                 end_critical_section(S_SESSION_TABLE);
1356
1357 SKIP_SELECT:
1358                 /* We're bound to a session */
1359                 pthread_mutex_lock(&ThreadCountMutex);
1360                 ++active_workers;
1361                 pthread_mutex_unlock(&ThreadCountMutex);
1362
1363                 if (bind_me != NULL) {
1364                         become_session(bind_me);
1365
1366                         if (bind_me->state == CON_STARTING) {
1367                                 bind_me->state = CON_EXECUTING;
1368                                 begin_session(bind_me);
1369                                 bind_me->h_greeting_function();
1370                         }
1371                         /* If the client has sent a command, execute it. */
1372                         if (CC->input_waiting) {
1373                                 CC->h_command_function();
1374
1375                                 while (HaveMoreLinesWaiting(CC))
1376                                        CC->h_command_function();
1377
1378                                 CC->input_waiting = 0;
1379                         }
1380
1381                         /* If there are asynchronous messages waiting and the client supports it, do those now */
1382                         if ((CC->is_async) && (CC->async_waiting) && (CC->h_async_function != NULL)) {
1383                                 CC->h_async_function();
1384                                 CC->async_waiting = 0;
1385                         }
1386
1387                         force_purge = CC->kill_me;
1388                         become_session(NULL);
1389                         bind_me->state = CON_IDLE;
1390                 }
1391
1392                 dead_session_purge(force_purge);
1393                 do_housekeeping();
1394
1395                 pthread_mutex_lock(&ThreadCountMutex);
1396                 --active_workers;
1397                 if ((active_workers + CtdlGetConfigInt("c_min_workers") < num_workers) &&
1398                     (num_workers > CtdlGetConfigInt("c_min_workers")))
1399                 {
1400                         num_workers--;
1401                         pthread_mutex_unlock(&ThreadCountMutex);
1402                         return (NULL);
1403                 }
1404                 pthread_mutex_unlock(&ThreadCountMutex);
1405         }
1406
1407         /* If control reaches this point, the server is shutting down */
1408         pthread_mutex_lock(&ThreadCountMutex);
1409         --num_workers;
1410         pthread_mutex_unlock(&ThreadCountMutex);
1411         return(NULL);
1412 }
1413
1414
1415 /*
1416  * SyslogFacility()
1417  * Translate text facility name to syslog.h defined value.
1418  */
1419 int SyslogFacility(char *name)
1420 {
1421         int i;
1422         struct
1423         {
1424                 int facility;
1425                 char *name;
1426         }   facTbl[] =
1427         {
1428                 {   LOG_KERN,   "kern"          },
1429                 {   LOG_USER,   "user"          },
1430                 {   LOG_MAIL,   "mail"          },
1431                 {   LOG_DAEMON, "daemon"        },
1432                 {   LOG_AUTH,   "auth"          },
1433                 {   LOG_SYSLOG, "syslog"        },
1434                 {   LOG_LPR,    "lpr"           },
1435                 {   LOG_NEWS,   "news"          },
1436                 {   LOG_UUCP,   "uucp"          },
1437                 {   LOG_LOCAL0, "local0"        },
1438                 {   LOG_LOCAL1, "local1"        },
1439                 {   LOG_LOCAL2, "local2"        },
1440                 {   LOG_LOCAL3, "local3"        },
1441                 {   LOG_LOCAL4, "local4"        },
1442                 {   LOG_LOCAL5, "local5"        },
1443                 {   LOG_LOCAL6, "local6"        },
1444                 {   LOG_LOCAL7, "local7"        },
1445                 {   0,            NULL          }
1446         };
1447         for(i = 0; facTbl[i].name != NULL; i++) {
1448                 if(!strcasecmp(name, facTbl[i].name))
1449                         return facTbl[i].facility;
1450         }
1451         return LOG_DAEMON;
1452 }