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 as published by
  14  * the Free Software Foundation; either version 3 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  25  */
  26
  27 #include "sysdep.h"
  28 #include <stdlib.h>
  29 #include <unistd.h>
  30 #include <stdio.h>
  31 #include <fcntl.h>
  32 #include <ctype.h>
  33 #include <signal.h>
  34 #include <sys/types.h>
  35 #include <sys/stat.h>
  36 #include <sys/wait.h>
  37 #include <sys/socket.h>
  38 #include <syslog.h>
  39 #include <sys/syslog.h>
  40
  41 #if TIME_WITH_SYS_TIME
  42 # include <sys/time.h>
  43 # include <time.h>
  44 #else
  45 # if HAVE_SYS_TIME_H
  46 #  include <sys/time.h>
  47 # else
  48 #  include <time.h>
  49 # endif
  50 #endif
  51
  52 #include <limits.h>
  53 #include <sys/resource.h>
  54 #include <netinet/in.h>
  55 #include <netinet/tcp.h>
  56 #include <arpa/inet.h>
  57 #include <netdb.h>
  58 #include <sys/un.h>
  59 #include <string.h>
  60 #include <pwd.h>
  61 #include <errno.h>
  62 #include <stdarg.h>
  63 #include <grp.h>
  64 #define SHOW_ME_VAPPEND_PRINTF
  65 #include <libcitadel.h>
  66 #include "citadel.h"
  67 #include "server.h"
  68 #include "sysdep_decls.h"
  69 #include "citserver.h"
  70 #include "support.h"
  71 #include "config.h"
  72 #include "database.h"
  73 #include "housekeeping.h"
  74 #include "modules/crypto/serv_crypto.h" /* Needed for init_ssl, client_write_ssl, client_read_ssl, destruct_ssl */
  75 #include "ecrash.h"
  76 #include "context.h"
  77
  78 #ifdef HAVE_SYS_SELECT_H
  79 #include <sys/select.h>
  80 #endif
  81
  82 #ifndef HAVE_SNPRINTF
  83 #include "snprintf.h"
  84 #endif
  85
  86 #include "ctdl_module.h"
  87 #include "threads.h"
  88 #include "user_ops.h"
  89 #include "control.h"
  90
  91
  92 /*
  93  * Signal handler to shut down the server.
  94  */
  95
  96 volatile int exit_signal = 0;
  97 volatile int shutdown_and_halt = 0;
  98 volatile int restart_server = 0;
  99 volatile int running_as_daemon = 0;
 100
 101 static RETSIGTYPE signal_cleanup(int signum) {
 102
 103         if (CT)
 104                 CT->signal = signum;
 105         else
 106         {
 107                 syslog(LOG_DEBUG, "Caught signal %d; shutting down.\n", signum);
 108                 exit_signal = signum;
 109         }
 110 }
 111
 112 static RETSIGTYPE signal_exit(int signum) {
 113         exit(1);
 114 }
 115
 116
 117
 118 /*
 119  * Some initialization stuff...
 120  */
 121 void init_sysdep(void) {
 122         sigset_t set;
 123
 124         /* Avoid vulnerabilities related to FD_SETSIZE if we can. */
 125 #ifdef FD_SETSIZE
 126 #ifdef RLIMIT_NOFILE
 127         struct rlimit rl;
 128         getrlimit(RLIMIT_NOFILE, &rl);
 129         rl.rlim_cur = FD_SETSIZE;
 130         rl.rlim_max = FD_SETSIZE;
 131         setrlimit(RLIMIT_NOFILE, &rl);
 132 #endif
 133 #endif
 134
 135         /* If we've got OpenSSL, we're going to use it. */
 136 #ifdef HAVE_OPENSSL
 137         init_ssl();
 138 #endif
 139
 140         /*
 141          * Set up a place to put thread-specific data.
 142          * We only need a single pointer per thread - it points to the
 143          * CitContext structure (in the ContextList linked list) of the
 144          * session to which the calling thread is currently bound.
 145          */
 146         if (citthread_key_create(&MyConKey, NULL) != 0) {
 147                 syslog(LOG_CRIT, "Can't create TSD key: %s\n",
 148                         strerror(errno));
 149         }
 150
 151         /*
 152          * The action for unexpected signals and exceptions should be to
 153          * call signal_cleanup() to gracefully shut down the server.
 154          */
 155         sigemptyset(&set);
 156         sigaddset(&set, SIGINT);                // intr = shutdown
 157         sigaddset(&set, SIGHUP);
 158         sigaddset(&set, SIGTERM);
 159         sigprocmask(SIG_UNBLOCK, &set, NULL);
 160
 161         signal(SIGINT, signal_cleanup);         // intr = shutdown
 162         signal(SIGHUP, signal_cleanup);
 163         signal(SIGTERM, signal_cleanup);
 164         signal(SIGUSR2, signal_exit);
 165
 166         /*
 167          * Do not shut down the server on broken pipe signals, otherwise the
 168          * whole Citadel service would come down whenever a single client
 169          * socket breaks.
 170          */
 171         signal(SIGPIPE, SIG_IGN);
 172 }
 173
 174
 175 /*
 176  * This is a generic function to set up a master socket for listening on
 177  * a TCP port.  The server shuts down if the bind fails.  (IPv4/IPv6 version)
 178  *
 179  * ip_addr      IP address to bind
 180  * port_number  port number to bind
 181  * queue_len    number of incoming connections to allow in the queue
 182  */
 183 int ctdl_tcp_server(char *ip_addr, int port_number, int queue_len, char *errormessage)
 184 {
 185         struct protoent *p;
 186         struct sockaddr_in6 sin6;
 187         struct sockaddr_in sin4;
 188         int s, i, b;
 189         int ip_version = 6;
 190
 191         memset(&sin6, 0, sizeof(sin6));
 192         memset(&sin4, 0, sizeof(sin4));
 193         sin6.sin6_family = AF_INET6;
 194         sin4.sin_family = AF_INET;
 195
 196         if (    (ip_addr == NULL)                                                       /* any IPv6 */
 197                 || (IsEmptyStr(ip_addr))
 198                 || (!strcmp(ip_addr, "*"))
 199         ) {
 200                 ip_version = 6;
 201                 sin6.sin6_addr = in6addr_any;
 202         }
 203         else if (!strcmp(ip_addr, "0.0.0.0"))                                           /* any IPv4 */
 204         {
 205                 ip_version = 4;
 206                 sin4.sin_addr.s_addr = INADDR_ANY;
 207         }
 208         else if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':')))                     /* specific IPv4 */
 209         {
 210                 ip_version = 4;
 211                 if (inet_pton(AF_INET, ip_addr, &sin4.sin_addr) <= 0) {
 212                         snprintf(errormessage, SIZ,
 213                                  "Error binding to [%s] : %s", ip_addr, strerror(errno)
 214                         );
 215                         syslog(LOG_ALERT, "%s\n", errormessage);
 216                         return (-1);
 217                 }
 218         }
 219         else                                                                            /* specific IPv6 */
 220         {
 221                 ip_version = 6;
 222                 if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
 223                         snprintf(errormessage, SIZ,
 224                                  "Error binding to [%s] : %s", ip_addr, strerror(errno)
 225                         );
 226                         syslog(LOG_ALERT, "%s\n", errormessage);
 227                         return (-1);
 228                 }
 229         }
 230
 231         if (port_number == 0) {
 232                 snprintf(errormessage, SIZ,
 233                          "Can't start: no port number specified."
 234                 );
 235                 syslog(LOG_ALERT, "%s\n", errormessage);
 236                 return (-1);
 237         }
 238         sin6.sin6_port = htons((u_short) port_number);
 239         sin4.sin_port = htons((u_short) port_number);
 240
 241         p = getprotobyname("tcp");
 242
 243         s = socket( ((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
 244         if (s < 0) {
 245                 snprintf(errormessage, SIZ,
 246                          "Can't create a listening socket: %s", strerror(errno)
 247                 );
 248                 syslog(LOG_ALERT, "%s\n", errormessage);
 249                 return (-1);
 250         }
 251         /* Set some socket options that make sense. */
 252         i = 1;
 253         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 254
 255         if (ip_version == 6) {
 256                 b = bind(s, (struct sockaddr *) &sin6, sizeof(sin6));
 257         }
 258         else {
 259                 b = bind(s, (struct sockaddr *) &sin4, sizeof(sin4));
 260         }
 261
 262         if (b < 0) {
 263                 snprintf(errormessage, SIZ,
 264                          "Can't bind: %s", strerror(errno)
 265                 );
 266                 syslog(LOG_ALERT, "%s\n", errormessage);
 267                 return (-1);
 268         }
 269
 270         fcntl(s, F_SETFL, O_NONBLOCK);
 271
 272         if (listen(s, ((queue_len >= 5) ? queue_len : 5) ) < 0) {
 273                 snprintf(errormessage, SIZ,
 274                          "Can't listen: %s", strerror(errno)
 275                 );
 276                 syslog(LOG_ALERT, "%s\n", errormessage);
 277                 return (-1);
 278         }
 279         return (s);
 280 }
 281
 282
 283
 284
 285
 286 /*
 287  * Create a Unix domain socket and listen on it
 288  */
 289 int ctdl_uds_server(char *sockpath, int queue_len, char *errormessage)
 290 {
 291         struct sockaddr_un addr;
 292         int s;
 293         int i;
 294         int actual_queue_len;
 295 #ifdef HAVE_STRUCT_UCRED
 296         int passcred = 1;
 297 #endif
 298
 299         actual_queue_len = queue_len;
 300         if (actual_queue_len < 5) actual_queue_len = 5;
 301
 302         i = unlink(sockpath);
 303         if ((i != 0) && (errno != ENOENT)) {
 304                 snprintf(errormessage, SIZ, "citserver: can't unlink %s: %s",
 305                         sockpath, strerror(errno)
 306                 );
 307                 syslog(LOG_EMERG, "%s\n", errormessage);
 308                 return(-1);
 309         }
 310
 311         memset(&addr, 0, sizeof(addr));
 312         addr.sun_family = AF_UNIX;
 313         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 314
 315         s = socket(AF_UNIX, SOCK_STREAM, 0);
 316         if (s < 0) {
 317                 snprintf(errormessage, SIZ,
 318                          "citserver: Can't create a socket: %s",
 319                          strerror(errno));
 320                 syslog(LOG_EMERG, "%s\n", errormessage);
 321                 return(-1);
 322         }
 323
 324         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 325                 snprintf(errormessage, SIZ,
 326                          "citserver: Can't bind: %s",
 327                          strerror(errno));
 328                 syslog(LOG_EMERG, "%s\n", errormessage);
 329                 return(-1);
 330         }
 331
 332         /* set to nonblock - we need this for some obscure situations */
 333         if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
 334                 snprintf(errormessage, SIZ,
 335                          "citserver: Can't set socket to non-blocking: %s",
 336                          strerror(errno));
 337                 syslog(LOG_EMERG, "%s\n", errormessage);
 338                 close(s);
 339                 return(-1);
 340         }
 341
 342         if (listen(s, actual_queue_len) < 0) {
 343                 snprintf(errormessage, SIZ,
 344                          "citserver: Can't listen: %s",
 345                          strerror(errno));
 346                 syslog(LOG_EMERG, "%s\n", errormessage);
 347                 return(-1);
 348         }
 349
 350 #ifdef HAVE_STRUCT_UCRED
 351         setsockopt(s, SOL_SOCKET, SO_PASSCRED, &passcred, sizeof(passcred));
 352 #endif
 353
 354         chmod(sockpath, S_ISGID|S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
 355         return(s);
 356 }
 357
 358
 359
 360 /*
 361  * The following functions implement output buffering on operating systems which
 362  * support it (such as Linux and various BSD flavors).
 363  */
 364 #ifndef HAVE_DARWIN
 365 #ifdef TCP_CORK
 366 #       define HAVE_TCP_BUFFERING
 367 #else
 368 #       ifdef TCP_NOPUSH
 369 #               define HAVE_TCP_BUFFERING
 370 #               define TCP_CORK TCP_NOPUSH
 371 #       endif
 372 #endif /* TCP_CORK */
 373 #endif /* HAVE_DARWIN */
 374
 375 static unsigned on = 1, off = 0;
 376
 377 void buffer_output(void) {
 378 #ifdef HAVE_TCP_BUFFERING
 379 #ifdef HAVE_OPENSSL
 380         if (!CC->redirect_ssl)
 381 #endif
 382                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 383 #endif
 384 }
 385
 386 void unbuffer_output(void) {
 387 #ifdef HAVE_TCP_BUFFERING
 388 #ifdef HAVE_OPENSSL
 389         if (!CC->redirect_ssl)
 390 #endif
 391                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 392 #endif
 393 }
 394
 395 void flush_output(void) {
 396 #ifdef HAVE_TCP_BUFFERING
 397         struct CitContext *CCC = CC;
 398         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 399         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 400 #endif
 401 }
 402
 403 /*
 404 static void flush_client_inbuf(void)
 405 {
 406         CitContext *CCC=CC;
 407
 408         FlushStrBuf(CCC->ReadBuf);
 409         CCC->Pos = NULL;
 410
 411 }
 412 */
 413
 414
 415 /*
 416  * client_close()       ...     close the client socket
 417  */
 418 void client_close(void) {
 419         CitContext *CCC = CC;
 420         int r;
 421
 422         if (!CCC) return;
 423         if (CCC->client_socket < 0) return;
 424         syslog(LOG_DEBUG, "Closing socket %d\n", CCC->client_socket);
 425         r = close(CCC->client_socket);
 426         if (!r) syslog(LOG_INFO, "close() failed: %s\n", strerror(errno));
 427         CCC->client_socket = -1 ;
 428 }
 429
 430
 431
 432
 433 /*
 434  * client_write()   ...    Send binary data to the client.
 435  */
 436 int client_write(const char *buf, int nbytes)
 437 {
 438         int bytes_written = 0;
 439         int retval;
 440 #ifndef HAVE_TCP_BUFFERING
 441         int old_buffer_len = 0;
 442 #endif
 443         fd_set wset;
 444         CitContext *Ctx;
 445         int fdflags;
 446
 447         if (nbytes < 1) return(0);
 448
 449         Ctx = CC;
 450
 451 #ifdef BIGBAD_IODBG
 452         {
 453                 int rv = 0;
 454                 char fn [SIZ];
 455                 FILE *fd;
 456
 457                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", Ctx->ServiceName, Ctx->cs_pid);
 458
 459                 fd = fopen(fn, "a+");
 460                 fprintf(fd, "Sending: BufSize: %d BufContent: [",
 461                         nbytes);
 462                 rv = fwrite(buf, nbytes, 1, fd);
 463                 fprintf(fd, "]\n");
 464
 465
 466                 fclose(fd);
 467         }
 468 #endif
 469 //      flush_client_inbuf();
 470         if (Ctx->redirect_buffer != NULL) {
 471                 StrBufAppendBufPlain(Ctx->redirect_buffer,
 472                                      buf, nbytes, 0);
 473                 return 0;
 474         }
 475
 476 #ifdef HAVE_OPENSSL
 477         if (Ctx->redirect_ssl) {
 478                 client_write_ssl(buf, nbytes);
 479                 return 0;
 480         }
 481 #endif
 482         if (Ctx->client_socket == -1) return -1;
 483
 484         fdflags = fcntl(Ctx->client_socket, F_GETFL);
 485
 486         while ((bytes_written < nbytes) && (Ctx->client_socket != -1)){
 487                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 488                         FD_ZERO(&wset);
 489                         FD_SET(Ctx->client_socket, &wset);
 490                         if (select(1, NULL, &wset, NULL, NULL) == -1) {
 491                                 if (errno == EINTR)
 492                                 {
 493                                         syslog(LOG_DEBUG, "client_write(%d bytes) select() interrupted.\n", nbytes-bytes_written);
 494                                         if (CtdlThreadCheckStop()) {
 495                                                 CC->kill_me = KILLME_SELECT_INTERRUPTED;
 496                                                 return (-1);
 497                                         } else {
 498                                                 /* can't trust fd's and stuff so we need to re-create them */
 499                                                 continue;
 500                                         }
 501                                 } else {
 502                                         syslog(LOG_ERR,
 503                                                 "client_write(%d bytes) select failed: %s (%d)\n",
 504                                                 nbytes - bytes_written,
 505                                                 strerror(errno), errno
 506                                         );
 507                                         cit_backtrace();
 508                                         client_close();
 509                                         Ctx->kill_me = KILLME_SELECT_FAILED;
 510                                         return -1;
 511                                 }
 512                         }
 513                 }
 514
 515                 retval = write(Ctx->client_socket, &buf[bytes_written], nbytes - bytes_written);
 516                 if (retval < 1) {
 517                         syslog(LOG_ERR,
 518                                 "client_write(%d bytes) failed: %s (%d)\n",
 519                                 nbytes - bytes_written,
 520                                 strerror(errno), errno
 521                         );
 522                         cit_backtrace();
 523                         client_close();
 524                         // syslog(LOG_DEBUG, "Tried to send: %s",  &buf[bytes_written]);
 525                         Ctx->kill_me = KILLME_WRITE_FAILED;
 526                         return -1;
 527                 }
 528                 bytes_written = bytes_written + retval;
 529         }
 530         return 0;
 531 }
 532
 533 void cputbuf(const StrBuf *Buf) {
 534         client_write(ChrPtr(Buf), StrLength(Buf));
 535 }
 536
 537
 538 /*
 539  * cprintf()    Send formatted printable data to the client.
 540  *              Implemented in terms of client_write() so it's technically not sysdep...
 541  */
 542 void cprintf(const char *format, ...) {
 543         va_list arg_ptr;
 544         char buf[1024];
 545
 546         va_start(arg_ptr, format);
 547         if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
 548                 buf[sizeof buf - 2] = '\n';
 549         client_write(buf, strlen(buf));
 550         va_end(arg_ptr);
 551 }
 552
 553
 554 /*
 555  * Read data from the client socket.
 556  *
 557  * sock         socket fd to read from
 558  * buf          buffer to read into
 559  * bytes        number of bytes to read
 560  * timeout      Number of seconds to wait before timing out
 561  *
 562  * Possible return values:
 563  *      1       Requested number of bytes has been read.
 564  *      0       Request timed out.
 565  *      -1      Connection is broken, or other error.
 566  */
 567 int client_read_blob(StrBuf *Target, int bytes, int timeout)
 568 {
 569         CitContext *CCC=CC;
 570         const char *Error;
 571         int retval = 0;
 572
 573 #ifdef HAVE_OPENSSL
 574         if (CCC->redirect_ssl) {
 575 #ifdef BIGBAD_IODBG
 576                 int rv = 0;
 577                 char fn [SIZ];
 578                 FILE *fd;
 579
 580                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 581
 582                 fd = fopen(fn, "a+");
 583                 fprintf(fd, "Reading BLOB: BufSize: %d ",
 584                         bytes);
 585                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 586                 fprintf(fd, "]\n");
 587
 588
 589                 fclose(fd);
 590 #endif
 591                 retval = client_read_sslblob(Target, bytes, timeout);
 592                 if (retval < 0) {
 593                         syslog(LOG_CRIT,
 594                                       "%s failed\n",
 595                                       __FUNCTION__);
 596                 }
 597 #ifdef BIGBAD_IODBG
 598                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 599
 600                 fd = fopen(fn, "a+");
 601                 fprintf(fd, "Read: %d BufContent: [",
 602                         StrLength(Target));
 603                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 604                 fprintf(fd, "]\n");
 605
 606
 607                 fclose(fd);
 608 #endif
 609         }
 610         else
 611 #endif
 612         {
 613 #ifdef BIGBAD_IODBG
 614                 int rv = 0;
 615                 char fn [SIZ];
 616                 FILE *fd;
 617
 618                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 619
 620                 fd = fopen(fn, "a+");
 621                 fprintf(fd, "Reading BLOB: BufSize: %d ",
 622                         bytes);
 623                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 624                 fprintf(fd, "]\n");
 625
 626
 627                 fclose(fd);
 628 #endif
 629                 retval = StrBufReadBLOBBuffered(Target,
 630                                                 CCC->ReadBuf,
 631                                                 &CCC->Pos,
 632                                                 &CCC->client_socket,
 633                                                 1,
 634                                                 bytes,
 635                                                 O_TERM,
 636                                                 &Error);
 637                 if (retval < 0) {
 638                         syslog(LOG_CRIT, "%s failed: %s\n", __FUNCTION__, Error);
 639                         client_close();
 640                         return retval;
 641                 }
 642 #ifdef BIGBAD_IODBG
 643                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 644
 645                 fd = fopen(fn, "a+");
 646                 fprintf(fd, "Read: %d BufContent: [",
 647                         StrLength(Target));
 648                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 649                 fprintf(fd, "]\n");
 650                 fclose(fd);
 651 #endif
 652         }
 653         return retval;
 654 }
 655
 656
 657 /*
 658  * to make client_read_random_blob() more efficient, increase buffer size.
 659  * just use in greeting function, else your buffer may be flushed
 660  */
 661 void client_set_inbound_buf(long N)
 662 {
 663         FlushStrBuf(CC->ReadBuf);
 664         ReAdjustEmptyBuf(CC->ReadBuf, N * SIZ, N * SIZ);
 665 }
 666
 667 int client_read_random_blob(StrBuf *Target, int timeout)
 668 {
 669         CitContext *CCC=CC;
 670         int rc;
 671
 672         rc =  client_read_blob(Target, 1, timeout);
 673         if (rc > 0)
 674         {
 675                 long len;
 676                 const char *pch;
 677
 678                 len = StrLength(CCC->ReadBuf);
 679                 pch = ChrPtr(CCC->ReadBuf);
 680
 681                 if (len > 0)
 682                 {
 683                         if (CCC->Pos != NULL) {
 684                                 len -= CCC->Pos - pch;
 685                                 pch = CCC->Pos;
 686                         }
 687                         StrBufAppendBufPlain(Target, pch, len, 0);
 688                         FlushStrBuf(CCC->ReadBuf);
 689                         CCC->Pos = NULL;
 690 #ifdef BIGBAD_IODBG
 691                         {
 692                                 int rv = 0;
 693                                 char fn [SIZ];
 694                                 FILE *fd;
 695
 696                                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 697
 698                                 fd = fopen(fn, "a+");
 699                                 fprintf(fd, "Read: BufSize: %d BufContent: [",
 700                                         StrLength(Target));
 701                                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 702                                 fprintf(fd, "]\n");
 703
 704
 705                                 fclose(fd);
 706                         }
 707 #endif
 708
 709                         return StrLength(Target);
 710                 }
 711                 return rc;
 712         }
 713         else
 714                 return rc;
 715 }
 716
 717 int client_read_to(char *buf, int bytes, int timeout)
 718 {
 719         CitContext *CCC=CC;
 720         int rc;
 721
 722         rc = client_read_blob(CCC->MigrateBuf, bytes, timeout);
 723         if (rc < 0)
 724         {
 725                 *buf = '\0';
 726                 return rc;
 727         }
 728         else
 729         {
 730                 memcpy(buf,
 731                        ChrPtr(CCC->MigrateBuf),
 732                        StrLength(CCC->MigrateBuf) + 1);
 733                 FlushStrBuf(CCC->MigrateBuf);
 734                 return rc;
 735         }
 736 }
 737
 738
 739 int HaveMoreLinesWaiting(CitContext *CCC)
 740 {
 741         if ((CCC->kill_me != 0) || (
 742             (CCC->Pos == NULL) &&
 743             (StrLength(CCC->ReadBuf) == 0) &&
 744             (CCC->client_socket != -1)) )
 745                 return 0;
 746         else
 747                 return 1;
 748 }
 749
 750
 751 /*
 752  * Read data from the client socket with default timeout.
 753  * (This is implemented in terms of client_read_to() and could be
 754  * justifiably moved out of sysdep.c)
 755  */
 756 INLINE int client_read(char *buf, int bytes)
 757 {
 758         return(client_read_to(buf, bytes, config.c_sleeping));
 759 }
 760
 761 int CtdlClientGetLine(StrBuf *Target)
 762 {
 763         CitContext *CCC=CC;
 764         const char *Error;
 765         int rc;
 766
 767         FlushStrBuf(Target);
 768 #ifdef HAVE_OPENSSL
 769         if (CCC->redirect_ssl) {
 770 #ifdef BIGBAD_IODBG
 771                 char fn [SIZ];
 772                 FILE *fd;
 773                 int len = 0;
 774                 int rlen = 0;
 775                 int  nlen = 0;
 776                 int nrlen = 0;
 777                 const char *pch;
 778
 779                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 780
 781                 fd = fopen(fn, "a+");
 782                 pch = ChrPtr(CCC->ReadBuf);
 783                 len = StrLength(CCC->ReadBuf);
 784                 if (CCC->Pos != NULL)
 785                         rlen = CC->Pos - pch;
 786                 else
 787                         rlen = 0;
 788
 789 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 790                         len, rlen, pch);
 791 */
 792                 fprintf(fd, "\n\n\nSSL1: BufSize: %d BufPos: %d \n_____________________\n",
 793                         len, rlen);
 794 #endif
 795                 rc = client_readline_sslbuffer(Target,
 796                                                CCC->ReadBuf,
 797                                                &CCC->Pos,
 798                                                1);
 799 #ifdef BIGBAD_IODBG
 800                 pch = ChrPtr(CCC->ReadBuf);
 801                 nlen = StrLength(CCC->ReadBuf);
 802                 if (CCC->Pos != NULL)
 803                         nrlen = CC->Pos - pch;
 804                 else
 805                         nrlen = 0;
 806 /*
 807                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 808                         len, nlen, rlen, nrlen, pch);
 809 */
 810                 fprintf(fd, "\n\n\nSSL2: BufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 811                         len, nlen, rlen, nrlen);
 812
 813                 fprintf(fd, "SSL3: Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 814                         StrLength(Target), ChrPtr(Target));
 815                 fclose(fd);
 816
 817                 if (rc < 0)
 818                         syslog(LOG_CRIT,
 819                                       "%s failed\n",
 820                                       __FUNCTION__);
 821 #endif
 822                 return rc;
 823         }
 824         else
 825 #endif
 826         {
 827 #ifdef BIGBAD_IODBG
 828                 char fn [SIZ];
 829                 FILE *fd;
 830                 int len, rlen, nlen, nrlen;
 831                 const char *pch;
 832
 833                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 834
 835                 fd = fopen(fn, "a+");
 836                 pch = ChrPtr(CCC->ReadBuf);
 837                 len = StrLength(CCC->ReadBuf);
 838                 if (CCC->Pos != NULL)
 839                         rlen = CC->Pos - pch;
 840                 else
 841                         rlen = 0;
 842
 843 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 844                         len, rlen, pch);
 845 */
 846                 fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \n_____________________\n",
 847                         len, rlen);
 848 #endif
 849                 rc = StrBufTCP_read_buffered_line_fast(Target,
 850                                                        CCC->ReadBuf,
 851                                                        &CCC->Pos,
 852                                                        &CCC->client_socket,
 853                                                        5,
 854                                                        1,
 855                                                        &Error);
 856
 857 #ifdef BIGBAD_IODBG
 858                 pch = ChrPtr(CCC->ReadBuf);
 859                 nlen = StrLength(CCC->ReadBuf);
 860                 if (CCC->Pos != NULL)
 861                         nrlen = CC->Pos - pch;
 862                 else
 863                         nrlen = 0;
 864 /*
 865                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 866                         len, nlen, rlen, nrlen, pch);
 867 */
 868                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 869                         len, nlen, rlen, nrlen);
 870
 871                 fprintf(fd, "Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 872                         StrLength(Target), ChrPtr(Target));
 873                 fclose(fd);
 874
 875                 if ((rc < 0) && (Error != NULL))
 876                         syslog(LOG_CRIT,
 877                                       "%s failed: %s\n",
 878                                       __FUNCTION__,
 879                                       Error);
 880 #endif
 881                 return rc;
 882         }
 883 }
 884
 885
 886 /*
 887  * client_getln()   ...   Get a LF-terminated line of text from the client.
 888  * (This is implemented in terms of client_read() and could be
 889  * justifiably moved out of sysdep.c)
 890  */
 891 int client_getln(char *buf, int bufsize)
 892 {
 893         int i, retval;
 894         CitContext *CCC=CC;
 895         const char *pCh;
 896
 897         retval = CtdlClientGetLine(CCC->MigrateBuf);
 898         if (retval < 0)
 899           return(retval >= 0);
 900
 901
 902         i = StrLength(CCC->MigrateBuf);
 903         pCh = ChrPtr(CCC->MigrateBuf);
 904         /* Strip the trailing LF, and the trailing CR if present.
 905          */
 906         if (bufsize <= i)
 907                 i = bufsize - 1;
 908         while ( (i > 0)
 909                 && ( (pCh[i - 1]==13)
 910                      || ( pCh[i - 1]==10)) ) {
 911                 i--;
 912         }
 913         memcpy(buf, pCh, i);
 914         buf[i] = 0;
 915
 916         FlushStrBuf(CCC->MigrateBuf);
 917         if (retval < 0) {
 918                 safestrncpy(&buf[i], "000", bufsize - i);
 919         }
 920         return(retval >= 0);
 921 }
 922
 923
 924 /*
 925  * Cleanup any contexts that are left lying around
 926  */
 927
 928
 929 void close_masters (void)
 930 {
 931         struct ServiceFunctionHook *serviceptr;
 932
 933         /*
 934          * close all protocol master sockets
 935          */
 936         for (serviceptr = ServiceHookTable; serviceptr != NULL;
 937             serviceptr = serviceptr->next ) {
 938
 939                 if (serviceptr->tcp_port > 0)
 940                 {
 941                         syslog(LOG_INFO, "Closing listener on port %d\n",
 942                                 serviceptr->tcp_port);
 943                         serviceptr->tcp_port = 0;
 944                 }
 945
 946                 if (serviceptr->sockpath != NULL)
 947                         syslog(LOG_INFO, "Closing listener on '%s'\n",
 948                                 serviceptr->sockpath);
 949
 950                 close(serviceptr->msock);
 951                 /* If it's a Unix domain socket, remove the file. */
 952                 if (serviceptr->sockpath != NULL) {
 953                         unlink(serviceptr->sockpath);
 954                         serviceptr->sockpath = NULL;
 955                 }
 956         }
 957 }
 958
 959
 960 /*
 961  * The system-dependent part of master_cleanup() - close the master socket.
 962  */
 963 void sysdep_master_cleanup(void) {
 964
 965         close_masters();
 966
 967         context_cleanup();
 968
 969 #ifdef HAVE_OPENSSL
 970         destruct_ssl();
 971 #endif
 972         CtdlDestroyProtoHooks();
 973         CtdlDestroyDeleteHooks();
 974         CtdlDestroyXmsgHooks();
 975         CtdlDestroyNetprocHooks();
 976         CtdlDestroyUserHooks();
 977         CtdlDestroyMessageHook();
 978         CtdlDestroyCleanupHooks();
 979         CtdlDestroyFixedOutputHooks();
 980         CtdlDestroySessionHooks();
 981         CtdlDestroyServiceHook();
 982         CtdlDestroyRoomHooks();
 983         CtdlDestroySearchHooks();
 984         #ifdef HAVE_BACKTRACE
 985 ///     eCrash_Uninit();
 986         #endif
 987 }
 988
 989
 990
 991 pid_t current_child;
 992 void graceful_shutdown(int signum) {
 993         kill(current_child, signum);
 994         unlink(file_pid_file);
 995         exit(0);
 996 }
 997
 998 int nFireUps = 0;
 999 int nFireUpsNonRestart = 0;
1000 pid_t ForkedPid = 1;
1001
1002 /*
1003  * Start running as a daemon.
1004  */
1005 void start_daemon(int unused) {
1006         int status = 0;
1007         pid_t child = 0;
1008         FILE *fp;
1009         int do_restart = 0;
1010
1011         current_child = 0;
1012
1013         /* Close stdin/stdout/stderr and replace them with /dev/null.
1014          * We don't just call close() because we don't want these fd's
1015          * to be reused for other files.
1016          */
1017         if (chdir(ctdl_run_dir) != 0)
1018                 syslog(LOG_EMERG,
1019                               "unable to change into directory [%s]: %s",
1020                               ctdl_run_dir, strerror(errno));
1021
1022         child = fork();
1023         if (child != 0) {
1024                 exit(0);
1025         }
1026
1027         signal(SIGHUP, SIG_IGN);
1028         signal(SIGINT, SIG_IGN);
1029         signal(SIGQUIT, SIG_IGN);
1030
1031         setsid();
1032         umask(0);
1033         if ((freopen("/dev/null", "r", stdin) != stdin) ||
1034             (freopen("/dev/null", "w", stdout) != stdout) ||
1035             (freopen("/dev/null", "w", stderr) != stderr))
1036                 syslog(LOG_EMERG,
1037                               "unable to reopen stdin/out/err %s",
1038                               strerror(errno));
1039
1040
1041         do {
1042                 current_child = fork();
1043
1044                 signal(SIGTERM, graceful_shutdown);
1045
1046                 if (current_child < 0) {
1047                         perror("fork");
1048                         exit(errno);
1049                 }
1050
1051                 else if (current_child == 0) {
1052                         return; /* continue starting citadel. */
1053                 }
1054
1055                 else {
1056                         fp = fopen(file_pid_file, "w");
1057                         if (fp != NULL) {
1058                                 fprintf(fp, ""F_PID_T"\n", getpid());
1059                                 fclose(fp);
1060                         }
1061                         waitpid(current_child, &status, 0);
1062                 }
1063                 do_restart = 0;
1064                 nFireUpsNonRestart = nFireUps;
1065
1066                 /* Exit code 0 means the watcher should exit */
1067                 if (WIFEXITED(status) && (WEXITSTATUS(status) == CTDLEXIT_SHUTDOWN)) {
1068                         do_restart = 0;
1069                 }
1070
1071                 /* Exit code 101-109 means the watcher should exit */
1072                 else if (WIFEXITED(status) && (WEXITSTATUS(status) >= 101) && (WEXITSTATUS(status) <= 109)) {
1073                         do_restart = 0;
1074                 }
1075
1076                 /* Any other exit code, or no exit code, means we should restart. */
1077                 else {
1078                         do_restart = 1;
1079                         nFireUps++;
1080                         ForkedPid = current_child;
1081                 }
1082
1083         } while (do_restart);
1084
1085         unlink(file_pid_file);
1086         exit(WEXITSTATUS(status));
1087 }
1088
1089
1090
1091 void checkcrash(void)
1092 {
1093         if (nFireUpsNonRestart != nFireUps)
1094         {
1095                 StrBuf *CrashMail;
1096
1097                 CrashMail = NewStrBuf();
1098                 syslog(LOG_ALERT, "Posting crash message\n");
1099                 StrBufPrintf(CrashMail,
1100                         " \n"
1101                         " The Citadel server process (citserver) terminated unexpectedly."
1102                         "\n \n"
1103                         " This could be the result of a bug in the server program, or some external "
1104                         "factor.\n \n"
1105                         " You can obtain more information about this by enabling core dumps.\n \n"
1106                         " For more information, please see:\n \n"
1107                         " http://citadel.org/doku.php/faq:mastering_your_os:gdb#how.do.i.make.my.system.produce.core-files"
1108                         "\n \n"
1109
1110                         " If you have already done this, the core dump is likely to be found at %score.%d\n"
1111                         ,
1112                         ctdl_run_dir, ForkedPid);
1113                 CtdlAideMessage(ChrPtr(CrashMail), "Citadel server process terminated unexpectedly");
1114                 FreeStrBuf(&CrashMail);
1115         }
1116 }
1117
1118
1119 /*
1120  * Generic routine to convert a login name to a full name (gecos)
1121  * Returns nonzero if a conversion took place
1122  */
1123 int convert_login(char NameToConvert[]) {
1124         struct passwd *pw;
1125         int a;
1126
1127         pw = getpwnam(NameToConvert);
1128         if (pw == NULL) {
1129                 return(0);
1130         }
1131         else {
1132                 strcpy(NameToConvert, pw->pw_gecos);
1133                 for (a=0; a<strlen(NameToConvert); ++a) {
1134                         if (NameToConvert[a] == ',') NameToConvert[a] = 0;
1135                 }
1136                 return(1);
1137         }
1138 }
1139
1140
1141
1142 /*
1143  * This loop just keeps going and going and going...
1144  */
1145 void *worker_thread(void *arg) {
1146         int highest;
1147         CitContext *ptr;
1148         CitContext *bind_me = NULL;
1149         fd_set readfds;
1150         int retval = 0;
1151         struct timeval tv;
1152         int force_purge = 0;
1153
1154
1155         while (!CtdlThreadCheckStop()) {
1156
1157                 /* make doubly sure we're not holding any stale db handles
1158                  * which might cause a deadlock.
1159                  */
1160                 cdb_check_handles();
1161 do_select:      force_purge = 0;
1162                 bind_me = NULL;         /* Which session shall we handle? */
1163
1164                 /* Initialize the fdset. */
1165                 FD_ZERO(&readfds);
1166                 highest = 0;
1167
1168                 begin_critical_section(S_SESSION_TABLE);
1169                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1170                         /* Don't select on dead sessions, only truly idle ones */
1171                         if (    (ptr->state == CON_IDLE)
1172                                 && (ptr->kill_me == 0)
1173                                 && (ptr->client_socket != -1)
1174                         ) {
1175                                 FD_SET(ptr->client_socket, &readfds);
1176                                 if (ptr->client_socket > highest)
1177                                         highest = ptr->client_socket;
1178                         }
1179                         if ((bind_me == NULL) && (ptr->state == CON_READY)) {
1180                                 bind_me = ptr;
1181                                 ptr->state = CON_EXECUTING;
1182                                 break;
1183                         }
1184                         if ((bind_me == NULL) && (ptr->state == CON_GREETING)) {
1185                                 bind_me = ptr;
1186                                 ptr->state = CON_STARTING;
1187                                 break;
1188                         }
1189                 }
1190                 end_critical_section(S_SESSION_TABLE);
1191
1192                 if (bind_me) {
1193                         goto SKIP_SELECT;
1194                 }
1195
1196                 /* If we got this far, it means that there are no sessions
1197                  * which a previous thread marked for attention, so we go
1198                  * ahead and get ready to select().
1199                  */
1200
1201                 if (!CtdlThreadCheckStop()) {
1202                         tv.tv_sec = 1;          /* wake up every second if no input */
1203                         tv.tv_usec = 0;
1204                         retval = CtdlThreadSelect(highest + 1, &readfds, NULL, NULL, &tv);
1205                 }
1206                 else
1207                         return NULL;
1208
1209                 /* Now figure out who made this select() unblock.
1210                  * First, check for an error or exit condition.
1211                  */
1212                 if (retval < 0) {
1213                         if (errno == EBADF) {
1214                                 syslog(LOG_NOTICE, "select() failed: (%s)\n",
1215                                         strerror(errno));
1216                                 goto do_select;
1217                         }
1218                         if (errno != EINTR) {
1219                                 syslog(LOG_EMERG, "Exiting (%s)\n", strerror(errno));
1220                                 CtdlThreadStopAll();
1221                                 continue;
1222                         } else {
1223                                 syslog(LOG_DEBUG, "Interrupted CtdlThreadSelect.\n");
1224                                 if (CtdlThreadCheckStop()) return(NULL);
1225                                 goto do_select;
1226                         }
1227                 }
1228                 else if(retval == 0) {
1229                         if (CtdlThreadCheckStop()) return(NULL);
1230                 }
1231
1232                 /* It must be a client socket.  Find a context that has data
1233                  * waiting on its socket *and* is in the CON_IDLE state.  Any
1234                  * active sockets other than our chosen one are marked as
1235                  * CON_READY so the next thread that comes around can just bind
1236                  * to one without having to select() again.
1237                  */
1238                 begin_critical_section(S_SESSION_TABLE);
1239                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1240                         int checkfd = ptr->client_socket;
1241                         if ((checkfd != -1) && (ptr->state == CON_IDLE) ){
1242                                 if (FD_ISSET(checkfd, &readfds)) {
1243                                         ptr->input_waiting = 1;
1244                                         if (!bind_me) {
1245                                                 bind_me = ptr;  /* I choose you! */
1246                                                 bind_me->state = CON_EXECUTING;
1247                                         }
1248                                         else {
1249                                                 ptr->state = CON_READY;
1250                                         }
1251                                 } else if ((ptr->is_async) && (ptr->async_waiting) && (ptr->h_async_function)) {
1252                                         if (!bind_me) {
1253                                                 bind_me = ptr;  /* I choose you! */
1254                                                 bind_me->state = CON_EXECUTING;
1255                                         }
1256                                         else {
1257                                                 ptr->state = CON_READY;
1258                                         }
1259                                 }
1260                         }
1261                 }
1262                 end_critical_section(S_SESSION_TABLE);
1263
1264 SKIP_SELECT:
1265                 /* We're bound to a session */
1266                 if (bind_me != NULL) {
1267                         become_session(bind_me);
1268
1269                         if (bind_me->state == CON_STARTING) {
1270                                 bind_me->state = CON_EXECUTING;
1271                                 begin_session(bind_me);
1272                                 bind_me->h_greeting_function();
1273                         }
1274                         /* If the client has sent a command, execute it. */
1275                         if (CC->input_waiting) {
1276                                 CC->h_command_function();
1277
1278                                 while (HaveMoreLinesWaiting(CC))
1279                                        CC->h_command_function();
1280
1281                                 CC->input_waiting = 0;
1282                         }
1283
1284                         /* If there are asynchronous messages waiting and the
1285                          * client supports it, do those now */
1286                         if ((CC->is_async) && (CC->async_waiting)
1287                            && (CC->h_async_function != NULL)) {
1288                                 CC->h_async_function();
1289                                 CC->async_waiting = 0;
1290                         }
1291
1292                         force_purge = CC->kill_me;
1293                         become_session(NULL);
1294                         bind_me->state = CON_IDLE;
1295                 }
1296
1297                 dead_session_purge(force_purge);
1298                 do_housekeeping();
1299         }
1300         /* If control reaches this point, the server is shutting down */
1301         return(NULL);
1302 }
1303
1304
1305
1306
1307 /*
1308  * A function to handle selecting on master sockets.
1309  * In other words it handles new connections.
1310  * It is a thread.
1311  */
1312 void *select_on_master (void *arg)
1313 {
1314         struct ServiceFunctionHook *serviceptr;
1315         fd_set master_fds;
1316         int highest;
1317         struct timeval tv;
1318         int ssock;                      /* Descriptor for client socket */
1319         CitContext *con= NULL;  /* Temporary context pointer */
1320         int m;
1321         int i;
1322         int retval;
1323         struct CitContext select_on_master_CC;
1324
1325         CtdlFillSystemContext(&select_on_master_CC, "select_on_master");
1326         citthread_setspecific(MyConKey, (void *)&select_on_master_CC);
1327
1328         while (!CtdlThreadCheckStop()) {
1329                 /* Initialize the fdset. */
1330                 FD_ZERO(&master_fds);
1331                 highest = 0;
1332
1333                 /* First, add the various master sockets to the fdset. */
1334                 for (serviceptr = ServiceHookTable; serviceptr != NULL;
1335                 serviceptr = serviceptr->next ) {
1336                         m = serviceptr->msock;
1337                         FD_SET(m, &master_fds);
1338                         if (m > highest) {
1339                                 highest = m;
1340                         }
1341                 }
1342
1343                 if (!CtdlThreadCheckStop()) {
1344                         tv.tv_sec = 60;         /* wake up every second if no input */
1345                         tv.tv_usec = 0;
1346                         retval = CtdlThreadSelect(highest + 1, &master_fds, NULL, NULL, &tv);
1347                 }
1348                 else
1349                         return NULL;
1350
1351                 /* Now figure out who made this select() unblock.
1352                  * First, check for an error or exit condition.
1353                  */
1354                 if (retval < 0) {
1355                         if (errno == EBADF) {
1356                                 syslog(LOG_NOTICE, "select() failed: (%s)\n",
1357                                         strerror(errno));
1358                                 continue;
1359                         }
1360                         if (errno != EINTR) {
1361                                 syslog(LOG_EMERG, "Exiting (%s)\n", strerror(errno));
1362                                 CtdlThreadStopAll();
1363                         } else {
1364                                 syslog(LOG_DEBUG, "Interrupted CtdlThreadSelect.\n");
1365                                 if (CtdlThreadCheckStop()) return(NULL);
1366                                 continue;
1367                         }
1368                 }
1369                 else if(retval == 0) {
1370                         if (CtdlThreadCheckStop()) return(NULL);
1371                         continue;
1372                 }
1373                 /* Next, check to see if it's a new client connecting
1374                  * on a master socket.
1375                  */
1376                 else for (serviceptr = ServiceHookTable; serviceptr != NULL;
1377                      serviceptr = serviceptr->next ) {
1378
1379                         if (FD_ISSET(serviceptr->msock, &master_fds)) {
1380                                 ssock = accept(serviceptr->msock, NULL, 0);
1381                                 if (ssock >= 0) {
1382                                         syslog(LOG_DEBUG, "New client socket %d\n", ssock);
1383
1384                                         /* The master socket is non-blocking but the client
1385                                          * sockets need to be blocking, otherwise certain
1386                                          * operations barf on FreeBSD.  Not a fatal error.
1387                                          */
1388                                         if (fcntl(ssock, F_SETFL, 0) < 0) {
1389                                                 syslog(LOG_EMERG,
1390                                                         "citserver: Can't set socket to blocking: %s\n",
1391                                                         strerror(errno));
1392                                         }
1393
1394                                         /* New context will be created already
1395                                          * set up in the CON_EXECUTING state.
1396                                          */
1397                                         con = CreateNewContext();
1398
1399                                         /* Assign our new socket number to it. */
1400                                         con->client_socket = ssock;
1401                                         con->h_command_function = serviceptr->h_command_function;
1402                                         con->h_async_function = serviceptr->h_async_function;
1403                                         con->h_greeting_function = serviceptr->h_greeting_function;
1404                                         con->ServiceName = serviceptr->ServiceName;
1405
1406                                         /* Determine whether it's a local socket */
1407                                         if (serviceptr->sockpath != NULL) {
1408                                                 con->is_local_socket = 1;
1409                                         }
1410
1411                                         /* Set the SO_REUSEADDR socket option */
1412                                         i = 1;
1413                                         setsockopt(ssock, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
1414                                         con->state = CON_GREETING;
1415                                         retval--;
1416                                         if (retval == 0)
1417                                                 break;
1418                                 }
1419                         }
1420                 }
1421         }
1422         CtdlClearSystemContext();
1423
1424         return NULL;
1425 }
1426
1427
1428
1429 /*
1430  * SyslogFacility()
1431  * Translate text facility name to syslog.h defined value.
1432  */
1433 int SyslogFacility(char *name)
1434 {
1435         int i;
1436         struct
1437         {
1438                 int facility;
1439                 char *name;
1440         }   facTbl[] =
1441         {
1442                 {   LOG_KERN,   "kern"          },
1443                 {   LOG_USER,   "user"          },
1444                 {   LOG_MAIL,   "mail"          },
1445                 {   LOG_DAEMON, "daemon"        },
1446                 {   LOG_AUTH,   "auth"          },
1447                 {   LOG_SYSLOG, "syslog"        },
1448                 {   LOG_LPR,    "lpr"           },
1449                 {   LOG_NEWS,   "news"          },
1450                 {   LOG_UUCP,   "uucp"          },
1451                 {   LOG_LOCAL0, "local0"        },
1452                 {   LOG_LOCAL1, "local1"        },
1453                 {   LOG_LOCAL2, "local2"        },
1454                 {   LOG_LOCAL3, "local3"        },
1455                 {   LOG_LOCAL4, "local4"        },
1456                 {   LOG_LOCAL5, "local5"        },
1457                 {   LOG_LOCAL6, "local6"        },
1458                 {   LOG_LOCAL7, "local7"        },
1459                 {   0,            NULL          }
1460         };
1461         for(i = 0; facTbl[i].name != NULL; i++) {
1462                 if(!strcasecmp(name, facTbl[i].name))
1463                         return facTbl[i].facility;
1464         }
1465         return LOG_DAEMON;
1466 }