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         syslog(LOG_DEBUG, "Caught signal %d; shutting down.", signum);
 103         exit_signal = signum;
 104         server_shutting_down = 1;
 105 }
 106
 107 static RETSIGTYPE signal_exit(int signum) {
 108         exit(1);
 109 }
 110
 111
 112
 113 /*
 114  * Some initialization stuff...
 115  */
 116 void init_sysdep(void) {
 117         sigset_t set;
 118
 119         /* Avoid vulnerabilities related to FD_SETSIZE if we can. */
 120 #ifdef FD_SETSIZE
 121 #ifdef RLIMIT_NOFILE
 122         struct rlimit rl;
 123         getrlimit(RLIMIT_NOFILE, &rl);
 124         rl.rlim_cur = FD_SETSIZE;
 125         rl.rlim_max = FD_SETSIZE;
 126         setrlimit(RLIMIT_NOFILE, &rl);
 127 #endif
 128 #endif
 129
 130         /* If we've got OpenSSL, we're going to use it. */
 131 #ifdef HAVE_OPENSSL
 132         init_ssl();
 133 #endif
 134
 135         /*
 136          * Set up a place to put thread-specific data.
 137          * We only need a single pointer per thread - it points to the
 138          * CitContext structure (in the ContextList linked list) of the
 139          * session to which the calling thread is currently bound.
 140          */
 141         if (pthread_key_create(&MyConKey, NULL) != 0) {
 142                 syslog(LOG_CRIT, "Can't create TSD key: %s", strerror(errno));
 143         }
 144
 145         /*
 146          * Interript, hangup, and terminate signals should cause the server
 147          * to gracefully clean up and shut down.
 148          */
 149         sigemptyset(&set);
 150         sigaddset(&set, SIGINT);
 151         sigaddset(&set, SIGHUP);
 152         sigaddset(&set, SIGTERM);
 153         sigprocmask(SIG_UNBLOCK, &set, NULL);
 154
 155         signal(SIGINT, signal_cleanup);
 156         signal(SIGHUP, signal_cleanup);
 157         signal(SIGTERM, signal_cleanup);
 158         signal(SIGUSR2, signal_exit);
 159
 160         /*
 161          * Do not shut down the server on broken pipe signals, otherwise the
 162          * whole Citadel service would come down whenever a single client
 163          * socket breaks.
 164          */
 165         signal(SIGPIPE, SIG_IGN);
 166 }
 167
 168
 169 /*
 170  * This is a generic function to set up a master socket for listening on
 171  * a TCP port.  The server shuts down if the bind fails.  (IPv4/IPv6 version)
 172  *
 173  * ip_addr      IP address to bind
 174  * port_number  port number to bind
 175  * queue_len    number of incoming connections to allow in the queue
 176  */
 177 int ctdl_tcp_server(char *ip_addr, int port_number, int queue_len, char *errormessage)
 178 {
 179         struct protoent *p;
 180         struct sockaddr_in6 sin6;
 181         struct sockaddr_in sin4;
 182         int s, i, b;
 183         int ip_version = 6;
 184
 185         memset(&sin6, 0, sizeof(sin6));
 186         memset(&sin4, 0, sizeof(sin4));
 187         sin6.sin6_family = AF_INET6;
 188         sin4.sin_family = AF_INET;
 189
 190         if (    (ip_addr == NULL)                                                       /* any IPv6 */
 191                 || (IsEmptyStr(ip_addr))
 192                 || (!strcmp(ip_addr, "*"))
 193         ) {
 194                 ip_version = 6;
 195                 sin6.sin6_addr = in6addr_any;
 196         }
 197         else if (!strcmp(ip_addr, "0.0.0.0"))                                           /* any IPv4 */
 198         {
 199                 ip_version = 4;
 200                 sin4.sin_addr.s_addr = INADDR_ANY;
 201         }
 202         else if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':')))                     /* specific IPv4 */
 203         {
 204                 ip_version = 4;
 205                 if (inet_pton(AF_INET, ip_addr, &sin4.sin_addr) <= 0) {
 206                         snprintf(errormessage, SIZ,
 207                                  "Error binding to [%s] : %s", ip_addr, strerror(errno)
 208                         );
 209                         syslog(LOG_ALERT, "%s", errormessage);
 210                         return (-1);
 211                 }
 212         }
 213         else                                                                            /* specific IPv6 */
 214         {
 215                 ip_version = 6;
 216                 if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
 217                         snprintf(errormessage, SIZ,
 218                                  "Error binding to [%s] : %s", ip_addr, strerror(errno)
 219                         );
 220                         syslog(LOG_ALERT, "%s", errormessage);
 221                         return (-1);
 222                 }
 223         }
 224
 225         if (port_number == 0) {
 226                 snprintf(errormessage, SIZ, "Can't start: no port number specified.");
 227                 syslog(LOG_ALERT, "%s", errormessage);
 228                 return (-1);
 229         }
 230         sin6.sin6_port = htons((u_short) port_number);
 231         sin4.sin_port = htons((u_short) port_number);
 232
 233         p = getprotobyname("tcp");
 234
 235         s = socket( ((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
 236         if (s < 0) {
 237                 snprintf(errormessage, SIZ,
 238                          "Can't create a listening socket: %s", strerror(errno)
 239                 );
 240                 syslog(LOG_ALERT, "%s", errormessage);
 241                 return (-1);
 242         }
 243         /* Set some socket options that make sense. */
 244         i = 1;
 245         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 246
 247         if (ip_version == 6) {
 248                 b = bind(s, (struct sockaddr *) &sin6, sizeof(sin6));
 249         }
 250         else {
 251                 b = bind(s, (struct sockaddr *) &sin4, sizeof(sin4));
 252         }
 253
 254         if (b < 0) {
 255                 snprintf(errormessage, SIZ,
 256                          "Can't bind: %s", strerror(errno)
 257                 );
 258                 syslog(LOG_ALERT, "%s", errormessage);
 259                 return (-1);
 260         }
 261
 262         fcntl(s, F_SETFL, O_NONBLOCK);
 263
 264         if (listen(s, ((queue_len >= 5) ? queue_len : 5) ) < 0) {
 265                 snprintf(errormessage, SIZ,
 266                          "Can't listen: %s", strerror(errno)
 267                 );
 268                 syslog(LOG_ALERT, "%s", errormessage);
 269                 return (-1);
 270         }
 271         return (s);
 272 }
 273
 274
 275
 276
 277
 278 /*
 279  * Create a Unix domain socket and listen on it
 280  */
 281 int ctdl_uds_server(char *sockpath, int queue_len, char *errormessage)
 282 {
 283         struct sockaddr_un addr;
 284         int s;
 285         int i;
 286         int actual_queue_len;
 287 #ifdef HAVE_STRUCT_UCRED
 288         int passcred = 1;
 289 #endif
 290
 291         actual_queue_len = queue_len;
 292         if (actual_queue_len < 5) actual_queue_len = 5;
 293
 294         i = unlink(sockpath);
 295         if ((i != 0) && (errno != ENOENT)) {
 296                 snprintf(errormessage, SIZ, "citserver: can't unlink %s: %s",
 297                         sockpath, strerror(errno)
 298                 );
 299                 syslog(LOG_EMERG, "%s", errormessage);
 300                 return(-1);
 301         }
 302
 303         memset(&addr, 0, sizeof(addr));
 304         addr.sun_family = AF_UNIX;
 305         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 306
 307         s = socket(AF_UNIX, SOCK_STREAM, 0);
 308         if (s < 0) {
 309                 snprintf(errormessage, SIZ,
 310                          "citserver: Can't create a socket: %s",
 311                          strerror(errno));
 312                 syslog(LOG_EMERG, "%s", errormessage);
 313                 return(-1);
 314         }
 315
 316         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 317                 snprintf(errormessage, SIZ,
 318                          "citserver: Can't bind: %s",
 319                          strerror(errno));
 320                 syslog(LOG_EMERG, "%s", errormessage);
 321                 return(-1);
 322         }
 323
 324         /* set to nonblock - we need this for some obscure situations */
 325         if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
 326                 snprintf(errormessage, SIZ,
 327                          "citserver: Can't set socket to non-blocking: %s",
 328                          strerror(errno));
 329                 syslog(LOG_EMERG, "%s", errormessage);
 330                 close(s);
 331                 return(-1);
 332         }
 333
 334         if (listen(s, actual_queue_len) < 0) {
 335                 snprintf(errormessage, SIZ,
 336                          "citserver: Can't listen: %s",
 337                          strerror(errno));
 338                 syslog(LOG_EMERG, "%s", errormessage);
 339                 return(-1);
 340         }
 341
 342 #ifdef HAVE_STRUCT_UCRED
 343         setsockopt(s, SOL_SOCKET, SO_PASSCRED, &passcred, sizeof(passcred));
 344 #endif
 345
 346         chmod(sockpath, S_ISGID|S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
 347         return(s);
 348 }
 349
 350
 351
 352 /*
 353  * The following functions implement output buffering on operating systems which
 354  * support it (such as Linux and various BSD flavors).
 355  */
 356 #ifndef HAVE_DARWIN
 357 #ifdef TCP_CORK
 358 #       define HAVE_TCP_BUFFERING
 359 #else
 360 #       ifdef TCP_NOPUSH
 361 #               define HAVE_TCP_BUFFERING
 362 #               define TCP_CORK TCP_NOPUSH
 363 #       endif
 364 #endif /* TCP_CORK */
 365 #endif /* HAVE_DARWIN */
 366
 367 static unsigned on = 1, off = 0;
 368
 369 void buffer_output(void) {
 370 #ifdef HAVE_TCP_BUFFERING
 371 #ifdef HAVE_OPENSSL
 372         if (!CC->redirect_ssl)
 373 #endif
 374                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 375 #endif
 376 }
 377
 378 void unbuffer_output(void) {
 379 #ifdef HAVE_TCP_BUFFERING
 380 #ifdef HAVE_OPENSSL
 381         if (!CC->redirect_ssl)
 382 #endif
 383                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 384 #endif
 385 }
 386
 387 void flush_output(void) {
 388 #ifdef HAVE_TCP_BUFFERING
 389         struct CitContext *CCC = CC;
 390         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 391         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 392 #endif
 393 }
 394
 395 /*
 396 static void flush_client_inbuf(void)
 397 {
 398         CitContext *CCC=CC;
 399
 400         FlushStrBuf(CCC->ReadBuf);
 401         CCC->RecvBuf->ReadWritePointer = NULL;
 402
 403 }
 404 */
 405
 406
 407 /*
 408  * client_close()       ...     close the client socket
 409  */
 410 void client_close(void) {
 411         CitContext *CCC = CC;
 412
 413         if (!CCC) return;
 414         if (CCC->client_socket <= 0) return;
 415         syslog(LOG_DEBUG, "Closing socket %d", CCC->client_socket);
 416
 417         close(CCC->client_socket);
 418         CCC->client_socket = -1 ;
 419 }
 420
 421
 422
 423
 424 /*
 425  * client_write()   ...    Send binary data to the client.
 426  */
 427 int client_write(const char *buf, int nbytes)
 428 {
 429         int bytes_written = 0;
 430         int retval;
 431 #ifndef HAVE_TCP_BUFFERING
 432         int old_buffer_len = 0;
 433 #endif
 434         fd_set wset;
 435         CitContext *Ctx;
 436         int fdflags;
 437
 438         if (nbytes < 1) return(0);
 439
 440         Ctx = CC;
 441
 442 #ifdef BIGBAD_IODBG
 443         {
 444                 int rv = 0;
 445                 char fn [SIZ];
 446                 FILE *fd;
 447
 448                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", Ctx->ServiceName, Ctx->cs_pid);
 449
 450                 fd = fopen(fn, "a+");
 451                 if (fd)
 452                 {
 453                     fprintf(fd, "Sending: BufSize: %d BufContent: [",
 454                             nbytes);
 455                     rv = fwrite(buf, nbytes, 1, fd);
 456                     fprintf(fd, "]\n");
 457                     fclose(fd);
 458                 }
 459         }
 460 #endif
 461 //      flush_client_inbuf();
 462         if (Ctx->redirect_buffer != NULL) {
 463                 StrBufAppendBufPlain(Ctx->redirect_buffer,
 464                                      buf, nbytes, 0);
 465                 return 0;
 466         }
 467
 468 #ifdef HAVE_OPENSSL
 469         if (Ctx->redirect_ssl) {
 470                 client_write_ssl(buf, nbytes);
 471                 return 0;
 472         }
 473 #endif
 474         if (Ctx->client_socket == -1) return -1;
 475
 476         fdflags = fcntl(Ctx->client_socket, F_GETFL);
 477
 478         while ((bytes_written < nbytes) && (Ctx->client_socket != -1)){
 479                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 480                         FD_ZERO(&wset);
 481                         FD_SET(Ctx->client_socket, &wset);
 482                         if (select(1, NULL, &wset, NULL, NULL) == -1) {
 483                                 if (errno == EINTR)
 484                                 {
 485                                         syslog(LOG_DEBUG, "client_write(%d bytes) select() interrupted.",
 486                                                 nbytes-bytes_written
 487                                         );
 488                                         if (server_shutting_down) {
 489                                                 CC->kill_me = KILLME_SELECT_INTERRUPTED;
 490                                                 return (-1);
 491                                         } else {
 492                                                 /* can't trust fd's and stuff so we need to re-create them */
 493                                                 continue;
 494                                         }
 495                                 } else {
 496                                         syslog(LOG_ERR,
 497                                                 "client_write(%d bytes) select failed: %s (%d)",
 498                                                 nbytes - bytes_written,
 499                                                 strerror(errno), errno
 500                                         );
 501                                         cit_backtrace();
 502                                         client_close();
 503                                         Ctx->kill_me = KILLME_SELECT_FAILED;
 504                                         return -1;
 505                                 }
 506                         }
 507                 }
 508
 509                 retval = write(Ctx->client_socket, &buf[bytes_written], nbytes - bytes_written);
 510                 if (retval < 1) {
 511                         syslog(LOG_ERR,
 512                                 "client_write(%d bytes) failed: %s (%d)",
 513                                 nbytes - bytes_written,
 514                                 strerror(errno), errno
 515                         );
 516                         cit_backtrace();
 517                         client_close();
 518                         Ctx->kill_me = KILLME_WRITE_FAILED;
 519                         return -1;
 520                 }
 521                 bytes_written = bytes_written + retval;
 522         }
 523         return 0;
 524 }
 525
 526 void cputbuf(const StrBuf *Buf) {
 527         client_write(ChrPtr(Buf), StrLength(Buf));
 528 }
 529
 530
 531 /*
 532  * cprintf()    Send formatted printable data to the client.
 533  *              Implemented in terms of client_write() so it's technically not sysdep...
 534  */
 535 void cprintf(const char *format, ...) {
 536         va_list arg_ptr;
 537         char buf[1024];
 538
 539         va_start(arg_ptr, format);
 540         if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
 541                 buf[sizeof buf - 2] = '\n';
 542         client_write(buf, strlen(buf));
 543         va_end(arg_ptr);
 544 }
 545
 546
 547 /*
 548  * Read data from the client socket.
 549  *
 550  * sock         socket fd to read from
 551  * buf          buffer to read into
 552  * bytes        number of bytes to read
 553  * timeout      Number of seconds to wait before timing out
 554  *
 555  * Possible return values:
 556  *      1       Requested number of bytes has been read.
 557  *      0       Request timed out.
 558  *      -1      Connection is broken, or other error.
 559  */
 560 int client_read_blob(StrBuf *Target, int bytes, int timeout)
 561 {
 562         CitContext *CCC=CC;
 563         const char *Error;
 564         int retval = 0;
 565
 566 #ifdef HAVE_OPENSSL
 567         if (CCC->redirect_ssl) {
 568 #ifdef BIGBAD_IODBG
 569                 int rv = 0;
 570                 char fn [SIZ];
 571                 FILE *fd;
 572
 573                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 574
 575                 fd = fopen(fn, "a+");
 576                 fprintf(fd, "Reading BLOB: BufSize: %d ",
 577                         bytes);
 578                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 579                 fprintf(fd, "]\n");
 580
 581
 582                 fclose(fd);
 583 #endif
 584                 retval = client_read_sslblob(Target, bytes, timeout);
 585                 if (retval < 0) {
 586                         syslog(LOG_CRIT, "%s failed", __FUNCTION__);
 587                 }
 588 #ifdef BIGBAD_IODBG
 589                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 590
 591                 fd = fopen(fn, "a+");
 592                 fprintf(fd, "Read: %d BufContent: [",
 593                         StrLength(Target));
 594                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 595                 fprintf(fd, "]\n");
 596
 597
 598                 fclose(fd);
 599 #endif
 600         }
 601         else
 602 #endif
 603         {
 604 #ifdef BIGBAD_IODBG
 605                 int rv = 0;
 606                 char fn [SIZ];
 607                 FILE *fd;
 608
 609                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 610
 611                 fd = fopen(fn, "a+");
 612                 fprintf(fd, "Reading BLOB: BufSize: %d ",
 613                         bytes);
 614                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 615                 fprintf(fd, "]\n");
 616
 617
 618                 fclose(fd);
 619 #endif
 620                 retval = StrBufReadBLOBBuffered(Target,
 621                                                 CCC->RecvBuf.Buf,
 622                                                 &CCC->RecvBuf.ReadWritePointer,
 623                                                 &CCC->client_socket,
 624                                                 1,
 625                                                 bytes,
 626                                                 O_TERM,
 627                                                 &Error);
 628                 if (retval < 0) {
 629                         syslog(LOG_CRIT, "%s failed: %s\n", __FUNCTION__, Error);
 630                         client_close();
 631                         return retval;
 632                 }
 633 #ifdef BIGBAD_IODBG
 634                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 635
 636                 fd = fopen(fn, "a+");
 637                 fprintf(fd, "Read: %d BufContent: [",
 638                         StrLength(Target));
 639                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 640                 fprintf(fd, "]\n");
 641                 fclose(fd);
 642 #endif
 643         }
 644         return retval;
 645 }
 646
 647
 648 /*
 649  * to make client_read_random_blob() more efficient, increase buffer size.
 650  * just use in greeting function, else your buffer may be flushed
 651  */
 652 void client_set_inbound_buf(long N)
 653 {
 654         CitContext *CCC=CC;
 655         FlushStrBuf(CCC->RecvBuf.Buf);
 656         ReAdjustEmptyBuf(CCC->RecvBuf.Buf, N * SIZ, N * SIZ);
 657 }
 658
 659 int client_read_random_blob(StrBuf *Target, int timeout)
 660 {
 661         CitContext *CCC=CC;
 662         int rc;
 663
 664         rc =  client_read_blob(Target, 1, timeout);
 665         if (rc > 0)
 666         {
 667                 long len;
 668                 const char *pch;
 669
 670                 len = StrLength(CCC->RecvBuf.Buf);
 671                 pch = ChrPtr(CCC->RecvBuf.Buf);
 672
 673                 if (len > 0)
 674                 {
 675                         if (CCC->RecvBuf.ReadWritePointer != NULL) {
 676                                 len -= CCC->RecvBuf.ReadWritePointer - pch;
 677                                 pch = CCC->RecvBuf.ReadWritePointer;
 678                         }
 679                         StrBufAppendBufPlain(Target, pch, len, 0);
 680                         FlushStrBuf(CCC->RecvBuf.Buf);
 681                         CCC->RecvBuf.ReadWritePointer = NULL;
 682 #ifdef BIGBAD_IODBG
 683                         {
 684                                 int rv = 0;
 685                                 char fn [SIZ];
 686                                 FILE *fd;
 687
 688                                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 689
 690                                 fd = fopen(fn, "a+");
 691                                 fprintf(fd, "Read: BufSize: %d BufContent: [",
 692                                         StrLength(Target));
 693                                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 694                                 fprintf(fd, "]\n");
 695
 696
 697                                 fclose(fd);
 698                         }
 699 #endif
 700
 701                         return StrLength(Target);
 702                 }
 703                 return rc;
 704         }
 705         else
 706                 return rc;
 707 }
 708
 709 int client_read_to(char *buf, int bytes, int timeout)
 710 {
 711         CitContext *CCC=CC;
 712         int rc;
 713
 714         rc = client_read_blob(CCC->MigrateBuf, bytes, timeout);
 715         if (rc < 0)
 716         {
 717                 *buf = '\0';
 718                 return rc;
 719         }
 720         else
 721         {
 722                 memcpy(buf,
 723                        ChrPtr(CCC->MigrateBuf),
 724                        StrLength(CCC->MigrateBuf) + 1);
 725                 FlushStrBuf(CCC->MigrateBuf);
 726                 return rc;
 727         }
 728 }
 729
 730
 731 int HaveMoreLinesWaiting(CitContext *CCC)
 732 {
 733         if ((CCC->kill_me != 0) ||
 734             ( (CCC->RecvBuf.ReadWritePointer == NULL) &&
 735               (StrLength(CCC->RecvBuf.Buf) == 0) &&
 736               (CCC->client_socket != -1)) )
 737                 return 0;
 738         else
 739                 return 1;
 740 }
 741
 742
 743 /*
 744  * Read data from the client socket with default timeout.
 745  * (This is implemented in terms of client_read_to() and could be
 746  * justifiably moved out of sysdep.c)
 747  */
 748 INLINE int client_read(char *buf, int bytes)
 749 {
 750         return(client_read_to(buf, bytes, config.c_sleeping));
 751 }
 752
 753 int CtdlClientGetLine(StrBuf *Target)
 754 {
 755         CitContext *CCC=CC;
 756         const char *Error;
 757         int rc;
 758
 759         FlushStrBuf(Target);
 760 #ifdef HAVE_OPENSSL
 761         if (CCC->redirect_ssl) {
 762 #ifdef BIGBAD_IODBG
 763                 char fn [SIZ];
 764                 FILE *fd;
 765                 int len = 0;
 766                 int rlen = 0;
 767                 int  nlen = 0;
 768                 int nrlen = 0;
 769                 const char *pch;
 770
 771                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 772
 773                 fd = fopen(fn, "a+");
 774                 pch = ChrPtr(CCC->RecvBuf.Buf);
 775                 len = StrLength(CCC->RecvBuf.Buf);
 776                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 777                         rlen = CCC->RecvBuf.ReadWritePointer - pch;
 778                 else
 779                         rlen = 0;
 780
 781 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 782                         len, rlen, pch);
 783 */
 784                 fprintf(fd, "\n\n\nSSL1: BufSize: %d BufPos: %d \n_____________________\n",
 785                         len, rlen);
 786 #endif
 787                 rc = client_readline_sslbuffer(Target,
 788                                                CCC->RecvBuf.Buf,
 789                                                &CCC->RecvBuf.ReadWritePointer,
 790                                                1);
 791 #ifdef BIGBAD_IODBG
 792                 pch = ChrPtr(CCC->RecvBuf.Buf);
 793                 nlen = StrLength(CCC->RecvBuf.Buf);
 794                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 795                         nrlen = CCC->RecvBuf.ReadWritePointer - pch;
 796                 else
 797                         nrlen = 0;
 798 /*
 799                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 800                         len, nlen, rlen, nrlen, pch);
 801 */
 802                 fprintf(fd, "\n\n\nSSL2: BufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 803                         len, nlen, rlen, nrlen);
 804
 805                 fprintf(fd, "SSL3: Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 806                         StrLength(Target), ChrPtr(Target));
 807                 fclose(fd);
 808
 809                 if (rc < 0)
 810                         syslog(LOG_CRIT,
 811                                       "%s failed\n",
 812                                       __FUNCTION__);
 813 #endif
 814                 return rc;
 815         }
 816         else
 817 #endif
 818         {
 819 #ifdef BIGBAD_IODBG
 820                 char fn [SIZ];
 821                 FILE *fd;
 822                 int len, rlen, nlen, nrlen;
 823                 const char *pch;
 824
 825                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 826
 827                 fd = fopen(fn, "a+");
 828                 pch = ChrPtr(CCC->RecvBuf.Buf);
 829                 len = StrLength(CCC->RecvBuf.Buf);
 830                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 831                         rlen = CCC->RecvBuf.ReadWritePointer - pch;
 832                 else
 833                         rlen = 0;
 834
 835 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 836                         len, rlen, pch);
 837 */
 838                 fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \n_____________________\n",
 839                         len, rlen);
 840 #endif
 841                 rc = StrBufTCP_read_buffered_line_fast(Target,
 842                                                        CCC->RecvBuf.Buf,
 843                                                        &CCC->RecvBuf.ReadWritePointer,
 844                                                        &CCC->client_socket,
 845                                                        5,
 846                                                        1,
 847                                                        &Error);
 848
 849 #ifdef BIGBAD_IODBG
 850                 pch = ChrPtr(CCC->RecvBuf.Buf);
 851                 nlen = StrLength(CCC->RecvBuf.Buf);
 852                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 853                         nrlen = CCC->RecvBuf.ReadWritePointer - pch;
 854                 else
 855                         nrlen = 0;
 856 /*
 857                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 858                         len, nlen, rlen, nrlen, pch);
 859 */
 860                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 861                         len, nlen, rlen, nrlen);
 862
 863                 fprintf(fd, "Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 864                         StrLength(Target), ChrPtr(Target));
 865                 fclose(fd);
 866
 867                 if ((rc < 0) && (Error != NULL))
 868                         syslog(LOG_CRIT,
 869                                       "%s failed: %s\n",
 870                                       __FUNCTION__,
 871                                       Error);
 872 #endif
 873                 return rc;
 874         }
 875 }
 876
 877
 878 /*
 879  * client_getln()   ...   Get a LF-terminated line of text from the client.
 880  * (This is implemented in terms of client_read() and could be
 881  * justifiably moved out of sysdep.c)
 882  */
 883 int client_getln(char *buf, int bufsize)
 884 {
 885         int i, retval;
 886         CitContext *CCC=CC;
 887         const char *pCh;
 888
 889         retval = CtdlClientGetLine(CCC->MigrateBuf);
 890         if (retval < 0)
 891           return(retval >= 0);
 892
 893
 894         i = StrLength(CCC->MigrateBuf);
 895         pCh = ChrPtr(CCC->MigrateBuf);
 896         /* Strip the trailing LF, and the trailing CR if present.
 897          */
 898         if (bufsize <= i)
 899                 i = bufsize - 1;
 900         while ( (i > 0)
 901                 && ( (pCh[i - 1]==13)
 902                      || ( pCh[i - 1]==10)) ) {
 903                 i--;
 904         }
 905         memcpy(buf, pCh, i);
 906         buf[i] = 0;
 907
 908         FlushStrBuf(CCC->MigrateBuf);
 909         if (retval < 0) {
 910                 safestrncpy(&buf[i], "000", bufsize - i);
 911         }
 912         return(retval >= 0);
 913 }
 914
 915
 916 /*
 917  * Cleanup any contexts that are left lying around
 918  */
 919
 920
 921 void close_masters (void)
 922 {
 923         struct ServiceFunctionHook *serviceptr;
 924
 925         /*
 926          * close all protocol master sockets
 927          */
 928         for (serviceptr = ServiceHookTable; serviceptr != NULL;
 929             serviceptr = serviceptr->next ) {
 930
 931                 if (serviceptr->tcp_port > 0)
 932                 {
 933                         syslog(LOG_INFO, "Closing listener on port %d\n",
 934                                 serviceptr->tcp_port);
 935                         serviceptr->tcp_port = 0;
 936                 }
 937
 938                 if (serviceptr->sockpath != NULL)
 939                         syslog(LOG_INFO, "Closing listener on '%s'\n",
 940                                 serviceptr->sockpath);
 941
 942                 close(serviceptr->msock);
 943                 /* If it's a Unix domain socket, remove the file. */
 944                 if (serviceptr->sockpath != NULL) {
 945                         unlink(serviceptr->sockpath);
 946                         serviceptr->sockpath = NULL;
 947                 }
 948         }
 949 }
 950
 951
 952 /*
 953  * The system-dependent part of master_cleanup() - close the master socket.
 954  */
 955 void sysdep_master_cleanup(void) {
 956
 957         close_masters();
 958
 959         context_cleanup();
 960
 961 #ifdef HAVE_OPENSSL
 962         destruct_ssl();
 963 #endif
 964         CtdlDestroyProtoHooks();
 965         CtdlDestroyDeleteHooks();
 966         CtdlDestroyXmsgHooks();
 967         CtdlDestroyNetprocHooks();
 968         CtdlDestroyUserHooks();
 969         CtdlDestroyMessageHook();
 970         CtdlDestroyCleanupHooks();
 971         CtdlDestroyFixedOutputHooks();
 972         CtdlDestroySessionHooks();
 973         CtdlDestroyServiceHook();
 974         CtdlDestroyRoomHooks();
 975         CtdlDestroySearchHooks();
 976         #ifdef HAVE_BACKTRACE
 977 ///     eCrash_Uninit();
 978         #endif
 979 }
 980
 981
 982
 983 pid_t current_child;
 984 void graceful_shutdown(int signum) {
 985         kill(current_child, signum);
 986         unlink(file_pid_file);
 987         exit(0);
 988 }
 989
 990 int nFireUps = 0;
 991 int nFireUpsNonRestart = 0;
 992 pid_t ForkedPid = 1;
 993
 994 /*
 995  * Start running as a daemon.
 996  */
 997 void start_daemon(int unused) {
 998         int status = 0;
 999         pid_t child = 0;
1000         FILE *fp;
1001         int do_restart = 0;
1002
1003         current_child = 0;
1004
1005         /* Close stdin/stdout/stderr and replace them with /dev/null.
1006          * We don't just call close() because we don't want these fd's
1007          * to be reused for other files.
1008          */
1009         if (chdir(ctdl_run_dir) != 0)
1010                 syslog(LOG_EMERG,
1011                               "unable to change into directory [%s]: %s",
1012                               ctdl_run_dir, strerror(errno));
1013
1014         child = fork();
1015         if (child != 0) {
1016                 exit(0);
1017         }
1018
1019         signal(SIGHUP, SIG_IGN);
1020         signal(SIGINT, SIG_IGN);
1021         signal(SIGQUIT, SIG_IGN);
1022
1023         setsid();
1024         umask(0);
1025         if ((freopen("/dev/null", "r", stdin) != stdin) ||
1026             (freopen("/dev/null", "w", stdout) != stdout) ||
1027             (freopen("/dev/null", "w", stderr) != stderr))
1028                 syslog(LOG_EMERG,
1029                               "unable to reopen stdin/out/err %s",
1030                               strerror(errno));
1031
1032
1033         do {
1034                 current_child = fork();
1035
1036                 signal(SIGTERM, graceful_shutdown);
1037
1038                 if (current_child < 0) {
1039                         perror("fork");
1040                         exit(errno);
1041                 }
1042
1043                 else if (current_child == 0) {
1044                         return; /* continue starting citadel. */
1045                 }
1046
1047                 else {
1048                         fp = fopen(file_pid_file, "w");
1049                         if (fp != NULL) {
1050                                 fprintf(fp, ""F_PID_T"\n", getpid());
1051                                 fclose(fp);
1052                         }
1053                         waitpid(current_child, &status, 0);
1054                 }
1055                 do_restart = 0;
1056                 nFireUpsNonRestart = nFireUps;
1057
1058                 /* Exit code 0 means the watcher should exit */
1059                 if (WIFEXITED(status) && (WEXITSTATUS(status) == CTDLEXIT_SHUTDOWN)) {
1060                         do_restart = 0;
1061                 }
1062
1063                 /* Exit code 101-109 means the watcher should exit */
1064                 else if (WIFEXITED(status) && (WEXITSTATUS(status) >= 101) && (WEXITSTATUS(status) <= 109)) {
1065                         do_restart = 0;
1066                 }
1067
1068                 /* Any other exit code, or no exit code, means we should restart. */
1069                 else {
1070                         do_restart = 1;
1071                         nFireUps++;
1072                         ForkedPid = current_child;
1073                 }
1074
1075         } while (do_restart);
1076
1077         unlink(file_pid_file);
1078         exit(WEXITSTATUS(status));
1079 }
1080
1081
1082
1083 void checkcrash(void)
1084 {
1085         if (nFireUpsNonRestart != nFireUps)
1086         {
1087                 StrBuf *CrashMail;
1088
1089                 CrashMail = NewStrBuf();
1090                 syslog(LOG_ALERT, "Posting crash message\n");
1091                 StrBufPrintf(CrashMail,
1092                         " \n"
1093                         " The Citadel server process (citserver) terminated unexpectedly."
1094                         "\n \n"
1095                         " This could be the result of a bug in the server program, or some external "
1096                         "factor.\n \n"
1097                         " You can obtain more information about this by enabling core dumps.\n \n"
1098                         " For more information, please see:\n \n"
1099                         " http://citadel.org/doku.php/faq:mastering_your_os:gdb#how.do.i.make.my.system.produce.core-files"
1100                         "\n \n"
1101
1102                         " If you have already done this, the core dump is likely to be found at %score.%d\n"
1103                         ,
1104                         ctdl_run_dir, ForkedPid);
1105                 CtdlAideMessage(ChrPtr(CrashMail), "Citadel server process terminated unexpectedly");
1106                 FreeStrBuf(&CrashMail);
1107         }
1108 }
1109
1110
1111 /*
1112  * Generic routine to convert a login name to a full name (gecos)
1113  * Returns nonzero if a conversion took place
1114  */
1115 int convert_login(char NameToConvert[]) {
1116         struct passwd *pw;
1117         int a;
1118
1119         pw = getpwnam(NameToConvert);
1120         if (pw == NULL) {
1121                 return(0);
1122         }
1123         else {
1124                 strcpy(NameToConvert, pw->pw_gecos);
1125                 for (a=0; a<strlen(NameToConvert); ++a) {
1126                         if (NameToConvert[a] == ',') NameToConvert[a] = 0;
1127                 }
1128                 return(1);
1129         }
1130 }
1131
1132
1133
1134 /*
1135  * This loop just keeps going and going and going...
1136  */
1137 void *worker_thread(void *blah) {
1138         int highest;
1139         CitContext *ptr;
1140         CitContext *bind_me = NULL;
1141         fd_set readfds;
1142         int retval = 0;
1143         struct timeval tv;
1144         int force_purge = 0;
1145
1146         ++num_workers;
1147
1148         while (!server_shutting_down) {
1149
1150                 /* make doubly sure we're not holding any stale db handles
1151                  * which might cause a deadlock.
1152                  */
1153                 cdb_check_handles();
1154 do_select:      force_purge = 0;
1155                 bind_me = NULL;         /* Which session shall we handle? */
1156
1157                 /* Initialize the fdset. */
1158                 FD_ZERO(&readfds);
1159                 highest = 0;
1160
1161                 begin_critical_section(S_SESSION_TABLE);
1162                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1163                         if ((ptr->state == CON_SYS) && (ptr->client_socket == 0))
1164                             continue;
1165
1166                         /* Don't select on dead sessions, only truly idle ones */
1167                         if (    (ptr->state == CON_IDLE)
1168                                 && (ptr->kill_me == 0)
1169                                 && (ptr->client_socket > 0)
1170                         ) {
1171                                 FD_SET(ptr->client_socket, &readfds);
1172                                 if (ptr->client_socket > highest)
1173                                         highest = ptr->client_socket;
1174                         }
1175                         if ((bind_me == NULL) && (ptr->state == CON_READY)) {
1176                                 bind_me = ptr;
1177                                 ptr->state = CON_EXECUTING;
1178                                 break;
1179                         }
1180                         if ((bind_me == NULL) && (ptr->state == CON_GREETING)) {
1181                                 bind_me = ptr;
1182                                 ptr->state = CON_STARTING;
1183                                 break;
1184                         }
1185                 }
1186                 end_critical_section(S_SESSION_TABLE);
1187
1188                 if (bind_me) {
1189                         goto SKIP_SELECT;
1190                 }
1191
1192                 /* If we got this far, it means that there are no sessions
1193                  * which a previous thread marked for attention, so we go
1194                  * ahead and get ready to select().
1195                  */
1196
1197                 if (!server_shutting_down) {
1198                         tv.tv_sec = 1;          /* wake up every second if no input */
1199                         tv.tv_usec = 0;
1200                         retval = select(highest + 1, &readfds, NULL, NULL, &tv);
1201                 }
1202                 else {
1203                         return NULL;
1204                 }
1205
1206                 /* Now figure out who made this select() unblock.
1207                  * First, check for an error or exit condition.
1208                  */
1209                 if (retval < 0) {
1210                         if (errno == EBADF) {
1211                                 syslog(LOG_NOTICE, "select() failed: (%s)\n", strerror(errno));
1212                                 goto do_select;
1213                         }
1214                         if (errno != EINTR) {
1215                                 syslog(LOG_EMERG, "Exiting (%s)\n", strerror(errno));
1216                                 server_shutting_down = 1;
1217                                 continue;
1218                         } else {
1219 #if 0
1220                                 syslog(LOG_DEBUG, "Interrupted select()\n");
1221 #endif
1222                                 if (server_shutting_down) return(NULL);
1223                                 goto do_select;
1224                         }
1225                 }
1226                 else if (retval == 0) {
1227                         if (server_shutting_down) return(NULL);
1228                 }
1229
1230                 /* It must be a client socket.  Find a context that has data
1231                  * waiting on its socket *and* is in the CON_IDLE state.  Any
1232                  * active sockets other than our chosen one are marked as
1233                  * CON_READY so the next thread that comes around can just bind
1234                  * to one without having to select() again.
1235                  */
1236                 begin_critical_section(S_SESSION_TABLE);
1237                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1238                         int checkfd = ptr->client_socket;
1239                         if ((checkfd != -1) && (ptr->state == CON_IDLE) ){
1240                                 if (FD_ISSET(checkfd, &readfds)) {
1241                                         ptr->input_waiting = 1;
1242                                         if (!bind_me) {
1243                                                 bind_me = ptr;  /* I choose you! */
1244                                                 bind_me->state = CON_EXECUTING;
1245                                         }
1246                                         else {
1247                                                 ptr->state = CON_READY;
1248                                         }
1249                                 } else if ((ptr->is_async) && (ptr->async_waiting) && (ptr->h_async_function)) {
1250                                         if (!bind_me) {
1251                                                 bind_me = ptr;  /* I choose you! */
1252                                                 bind_me->state = CON_EXECUTING;
1253                                         }
1254                                         else {
1255                                                 ptr->state = CON_READY;
1256                                         }
1257                                 }
1258                         }
1259                 }
1260                 end_critical_section(S_SESSION_TABLE);
1261
1262 SKIP_SELECT:
1263                 /* We're bound to a session */
1264                 ++active_workers;
1265                 if (bind_me != NULL) {
1266                         become_session(bind_me);
1267
1268                         if (bind_me->state == CON_STARTING) {
1269                                 bind_me->state = CON_EXECUTING;
1270                                 begin_session(bind_me);
1271                                 bind_me->h_greeting_function();
1272                         }
1273                         /* If the client has sent a command, execute it. */
1274                         if (CC->input_waiting) {
1275                                 CC->h_command_function();
1276
1277                                 while (HaveMoreLinesWaiting(CC))
1278                                        CC->h_command_function();
1279
1280                                 CC->input_waiting = 0;
1281                         }
1282
1283                         /* If there are asynchronous messages waiting and the
1284                          * client supports it, do those now */
1285                         if ((CC->is_async) && (CC->async_waiting)
1286                            && (CC->h_async_function != NULL)) {
1287                                 CC->h_async_function();
1288                                 CC->async_waiting = 0;
1289                         }
1290
1291                         force_purge = CC->kill_me;
1292                         become_session(NULL);
1293                         bind_me->state = CON_IDLE;
1294                 }
1295
1296                 dead_session_purge(force_purge);
1297                 do_housekeeping();
1298                 --active_workers;
1299         }
1300
1301         /* If control reaches this point, the server is shutting down */
1302         --num_workers;
1303         return(NULL);
1304 }
1305
1306
1307
1308
1309 /*
1310  * A function to handle selecting on master sockets.
1311  * In other words it handles new connections.
1312  * It is a thread.
1313  */
1314 void *select_on_master(void *blah)
1315 {
1316         struct ServiceFunctionHook *serviceptr;
1317         fd_set master_fds;
1318         int highest;
1319         struct timeval tv;
1320         int ssock;                      /* Descriptor for client socket */
1321         CitContext *con = NULL;         /* Temporary context pointer */
1322         int m;
1323         int i;
1324         int retval;
1325         struct CitContext select_on_master_CC;
1326
1327         CtdlFillSystemContext(&select_on_master_CC, "select_on_master");
1328         pthread_setspecific(MyConKey, (void *)&select_on_master_CC);
1329
1330         while (!server_shutting_down) {
1331                 /* Initialize the fdset. */
1332                 FD_ZERO(&master_fds);
1333                 highest = 0;
1334
1335                 /* First, add the various master sockets to the fdset. */
1336                 for (serviceptr = ServiceHookTable; serviceptr != NULL;
1337                 serviceptr = serviceptr->next ) {
1338                         m = serviceptr->msock;
1339                         FD_SET(m, &master_fds);
1340                         if (m > highest) {
1341                                 highest = m;
1342                         }
1343                 }
1344
1345                 if (!server_shutting_down) {
1346                         tv.tv_sec = 60;         /* wake up every second if no input */
1347                         tv.tv_usec = 0;
1348                         retval = select(highest + 1, &master_fds, NULL, NULL, &tv);
1349                 }
1350                 else
1351                         return NULL;
1352
1353                 /* Now figure out who made this select() unblock.
1354                  * First, check for an error or exit condition.
1355                  */
1356                 if (retval < 0) {
1357                         if (errno == EBADF) {
1358                                 syslog(LOG_NOTICE, "select() failed: (%s)\n",
1359                                         strerror(errno));
1360                                 continue;
1361                         }
1362                         if (errno != EINTR) {
1363                                 syslog(LOG_EMERG, "Exiting (%s)\n", strerror(errno));
1364                                 server_shutting_down = 1;
1365                         } else {
1366 #if 0
1367                                 syslog(LOG_DEBUG, "Interrupted CtdlThreadSelect.\n");
1368 #endif
1369                                 if (server_shutting_down) return(NULL);
1370                                 continue;
1371                         }
1372                 }
1373                 else if(retval == 0) {
1374                         if (server_shutting_down) return(NULL);
1375                         continue;
1376                 }
1377                 /* Next, check to see if it's a new client connecting
1378                  * on a master socket.
1379                  */
1380                 else for (serviceptr = ServiceHookTable; serviceptr != NULL;
1381                      serviceptr = serviceptr->next ) {
1382
1383                         if (FD_ISSET(serviceptr->msock, &master_fds)) {
1384                                 ssock = accept(serviceptr->msock, NULL, 0);
1385                                 if (ssock >= 0) {
1386                                         syslog(LOG_DEBUG, "New client socket %d\n", ssock);
1387
1388                                         /* The master socket is non-blocking but the client
1389                                          * sockets need to be blocking, otherwise certain
1390                                          * operations barf on FreeBSD.  Not a fatal error.
1391                                          */
1392                                         if (fcntl(ssock, F_SETFL, 0) < 0) {
1393                                                 syslog(LOG_EMERG,
1394                                                         "citserver: Can't set socket to blocking: %s\n",
1395                                                         strerror(errno));
1396                                         }
1397
1398                                         /* New context will be created already
1399                                          * set up in the CON_EXECUTING state.
1400                                          */
1401                                         con = CreateNewContext();
1402
1403                                         /* Assign our new socket number to it. */
1404                                         con->client_socket = ssock;
1405                                         con->h_command_function = serviceptr->h_command_function;
1406                                         con->h_async_function = serviceptr->h_async_function;
1407                                         con->h_greeting_function = serviceptr->h_greeting_function;
1408                                         con->ServiceName = serviceptr->ServiceName;
1409
1410                                         /* Determine whether it's a local socket */
1411                                         if (serviceptr->sockpath != NULL) {
1412                                                 con->is_local_socket = 1;
1413                                         }
1414
1415                                         /* Set the SO_REUSEADDR socket option */
1416                                         i = 1;
1417                                         setsockopt(ssock, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
1418                                         con->state = CON_GREETING;
1419                                         retval--;
1420                                         if (retval == 0)
1421                                                 break;
1422                                 }
1423                         }
1424                 }
1425         }
1426         CtdlClearSystemContext();
1427
1428         return NULL;
1429 }
1430
1431
1432
1433 /*
1434  * SyslogFacility()
1435  * Translate text facility name to syslog.h defined value.
1436  */
1437 int SyslogFacility(char *name)
1438 {
1439         int i;
1440         struct
1441         {
1442                 int facility;
1443                 char *name;
1444         }   facTbl[] =
1445         {
1446                 {   LOG_KERN,   "kern"          },
1447                 {   LOG_USER,   "user"          },
1448                 {   LOG_MAIL,   "mail"          },
1449                 {   LOG_DAEMON, "daemon"        },
1450                 {   LOG_AUTH,   "auth"          },
1451                 {   LOG_SYSLOG, "syslog"        },
1452                 {   LOG_LPR,    "lpr"           },
1453                 {   LOG_NEWS,   "news"          },
1454                 {   LOG_UUCP,   "uucp"          },
1455                 {   LOG_LOCAL0, "local0"        },
1456                 {   LOG_LOCAL1, "local1"        },
1457                 {   LOG_LOCAL2, "local2"        },
1458                 {   LOG_LOCAL3, "local3"        },
1459                 {   LOG_LOCAL4, "local4"        },
1460                 {   LOG_LOCAL5, "local5"        },
1461                 {   LOG_LOCAL6, "local6"        },
1462                 {   LOG_LOCAL7, "local7"        },
1463                 {   0,            NULL          }
1464         };
1465         for(i = 0; facTbl[i].name != NULL; i++) {
1466                 if(!strcasecmp(name, facTbl[i].name))
1467                         return facTbl[i].facility;
1468         }
1469         return LOG_DAEMON;
1470 }