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         ThreadTSD *Cc;
 103
 104         Cc = CTP;
 105         if (Cc && Cc->self)
 106                 Cc->self->signal = signum;
 107         else
 108         {
 109                 syslog(LOG_DEBUG, "Caught signal %d; shutting down.\n", signum);
 110                 exit_signal = signum;
 111         }
 112 }
 113
 114 static RETSIGTYPE signal_exit(int signum) {
 115         exit(1);
 116 }
 117
 118
 119
 120 /*
 121  * Some initialization stuff...
 122  */
 123 void init_sysdep(void) {
 124         sigset_t set;
 125
 126         /* Avoid vulnerabilities related to FD_SETSIZE if we can. */
 127 #ifdef FD_SETSIZE
 128 #ifdef RLIMIT_NOFILE
 129         struct rlimit rl;
 130         getrlimit(RLIMIT_NOFILE, &rl);
 131         rl.rlim_cur = FD_SETSIZE;
 132         rl.rlim_max = FD_SETSIZE;
 133         setrlimit(RLIMIT_NOFILE, &rl);
 134 #endif
 135 #endif
 136
 137         /* If we've got OpenSSL, we're going to use it. */
 138 #ifdef HAVE_OPENSSL
 139         init_ssl();
 140 #endif
 141
 142         /*
 143          * Set up a place to put thread-specific data.
 144          * We only need a single pointer per thread - it points to the
 145          * CitContext structure (in the ContextList linked list) of the
 146          * session to which the calling thread is currently bound.
 147          */
 148         if (citthread_key_create(&MyConKey, NULL) != 0) {
 149                 syslog(LOG_CRIT, "Can't create TSD key: %s\n",
 150                         strerror(errno));
 151         }
 152
 153         /*
 154          * The action for unexpected signals and exceptions should be to
 155          * call signal_cleanup() to gracefully shut down the server.
 156          */
 157         sigemptyset(&set);
 158         sigaddset(&set, SIGINT);                // intr = shutdown
 159         sigaddset(&set, SIGHUP);
 160         sigaddset(&set, SIGTERM);
 161         sigprocmask(SIG_UNBLOCK, &set, NULL);
 162
 163         signal(SIGINT, signal_cleanup);         // intr = shutdown
 164         signal(SIGHUP, signal_cleanup);
 165         signal(SIGTERM, signal_cleanup);
 166         signal(SIGUSR2, signal_exit);
 167
 168         /*
 169          * Do not shut down the server on broken pipe signals, otherwise the
 170          * whole Citadel service would come down whenever a single client
 171          * socket breaks.
 172          */
 173         signal(SIGPIPE, SIG_IGN);
 174 }
 175
 176
 177 /*
 178  * This is a generic function to set up a master socket for listening on
 179  * a TCP port.  The server shuts down if the bind fails.  (IPv4/IPv6 version)
 180  *
 181  * ip_addr      IP address to bind
 182  * port_number  port number to bind
 183  * queue_len    number of incoming connections to allow in the queue
 184  */
 185 int ctdl_tcp_server(char *ip_addr, int port_number, int queue_len, char *errormessage)
 186 {
 187         struct protoent *p;
 188         struct sockaddr_in6 sin6;
 189         struct sockaddr_in sin4;
 190         int s, i, b;
 191         int ip_version = 6;
 192
 193         memset(&sin6, 0, sizeof(sin6));
 194         memset(&sin4, 0, sizeof(sin4));
 195         sin6.sin6_family = AF_INET6;
 196         sin4.sin_family = AF_INET;
 197
 198         if (    (ip_addr == NULL)                                                       /* any IPv6 */
 199                 || (IsEmptyStr(ip_addr))
 200                 || (!strcmp(ip_addr, "*"))
 201         ) {
 202                 ip_version = 6;
 203                 sin6.sin6_addr = in6addr_any;
 204         }
 205         else if (!strcmp(ip_addr, "0.0.0.0"))                                           /* any IPv4 */
 206         {
 207                 ip_version = 4;
 208                 sin4.sin_addr.s_addr = INADDR_ANY;
 209         }
 210         else if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':')))                     /* specific IPv4 */
 211         {
 212                 ip_version = 4;
 213                 if (inet_pton(AF_INET, ip_addr, &sin4.sin_addr) <= 0) {
 214                         snprintf(errormessage, SIZ,
 215                                  "Error binding to [%s] : %s", ip_addr, strerror(errno)
 216                         );
 217                         syslog(LOG_ALERT, "%s\n", errormessage);
 218                         return (-1);
 219                 }
 220         }
 221         else                                                                            /* specific IPv6 */
 222         {
 223                 ip_version = 6;
 224                 if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
 225                         snprintf(errormessage, SIZ,
 226                                  "Error binding to [%s] : %s", ip_addr, strerror(errno)
 227                         );
 228                         syslog(LOG_ALERT, "%s\n", errormessage);
 229                         return (-1);
 230                 }
 231         }
 232
 233         if (port_number == 0) {
 234                 snprintf(errormessage, SIZ,
 235                          "Can't start: no port number specified."
 236                 );
 237                 syslog(LOG_ALERT, "%s\n", errormessage);
 238                 return (-1);
 239         }
 240         sin6.sin6_port = htons((u_short) port_number);
 241         sin4.sin_port = htons((u_short) port_number);
 242
 243         p = getprotobyname("tcp");
 244
 245         s = socket( ((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
 246         if (s < 0) {
 247                 snprintf(errormessage, SIZ,
 248                          "Can't create a listening socket: %s", strerror(errno)
 249                 );
 250                 syslog(LOG_ALERT, "%s\n", errormessage);
 251                 return (-1);
 252         }
 253         /* Set some socket options that make sense. */
 254         i = 1;
 255         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 256
 257         if (ip_version == 6) {
 258                 b = bind(s, (struct sockaddr *) &sin6, sizeof(sin6));
 259         }
 260         else {
 261                 b = bind(s, (struct sockaddr *) &sin4, sizeof(sin4));
 262         }
 263
 264         if (b < 0) {
 265                 snprintf(errormessage, SIZ,
 266                          "Can't bind: %s", strerror(errno)
 267                 );
 268                 syslog(LOG_ALERT, "%s\n", errormessage);
 269                 return (-1);
 270         }
 271
 272         fcntl(s, F_SETFL, O_NONBLOCK);
 273
 274         if (listen(s, ((queue_len >= 5) ? queue_len : 5) ) < 0) {
 275                 snprintf(errormessage, SIZ,
 276                          "Can't listen: %s", strerror(errno)
 277                 );
 278                 syslog(LOG_ALERT, "%s\n", errormessage);
 279                 return (-1);
 280         }
 281         return (s);
 282 }
 283
 284
 285
 286
 287
 288 /*
 289  * Create a Unix domain socket and listen on it
 290  */
 291 int ctdl_uds_server(char *sockpath, int queue_len, char *errormessage)
 292 {
 293         struct sockaddr_un addr;
 294         int s;
 295         int i;
 296         int actual_queue_len;
 297 #ifdef HAVE_STRUCT_UCRED
 298         int passcred = 1;
 299 #endif
 300
 301         actual_queue_len = queue_len;
 302         if (actual_queue_len < 5) actual_queue_len = 5;
 303
 304         i = unlink(sockpath);
 305         if ((i != 0) && (errno != ENOENT)) {
 306                 snprintf(errormessage, SIZ, "citserver: can't unlink %s: %s",
 307                         sockpath, strerror(errno)
 308                 );
 309                 syslog(LOG_EMERG, "%s\n", errormessage);
 310                 return(-1);
 311         }
 312
 313         memset(&addr, 0, sizeof(addr));
 314         addr.sun_family = AF_UNIX;
 315         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 316
 317         s = socket(AF_UNIX, SOCK_STREAM, 0);
 318         if (s < 0) {
 319                 snprintf(errormessage, SIZ,
 320                          "citserver: Can't create a socket: %s",
 321                          strerror(errno));
 322                 syslog(LOG_EMERG, "%s\n", errormessage);
 323                 return(-1);
 324         }
 325
 326         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 327                 snprintf(errormessage, SIZ,
 328                          "citserver: Can't bind: %s",
 329                          strerror(errno));
 330                 syslog(LOG_EMERG, "%s\n", errormessage);
 331                 return(-1);
 332         }
 333
 334         /* set to nonblock - we need this for some obscure situations */
 335         if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
 336                 snprintf(errormessage, SIZ,
 337                          "citserver: Can't set socket to non-blocking: %s",
 338                          strerror(errno));
 339                 syslog(LOG_EMERG, "%s\n", errormessage);
 340                 close(s);
 341                 return(-1);
 342         }
 343
 344         if (listen(s, actual_queue_len) < 0) {
 345                 snprintf(errormessage, SIZ,
 346                          "citserver: Can't listen: %s",
 347                          strerror(errno));
 348                 syslog(LOG_EMERG, "%s\n", errormessage);
 349                 return(-1);
 350         }
 351
 352 #ifdef HAVE_STRUCT_UCRED
 353         setsockopt(s, SOL_SOCKET, SO_PASSCRED, &passcred, sizeof(passcred));
 354 #endif
 355
 356         chmod(sockpath, S_ISGID|S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
 357         return(s);
 358 }
 359
 360
 361
 362 /*
 363  * The following functions implement output buffering on operating systems which
 364  * support it (such as Linux and various BSD flavors).
 365  */
 366 #ifndef HAVE_DARWIN
 367 #ifdef TCP_CORK
 368 #       define HAVE_TCP_BUFFERING
 369 #else
 370 #       ifdef TCP_NOPUSH
 371 #               define HAVE_TCP_BUFFERING
 372 #               define TCP_CORK TCP_NOPUSH
 373 #       endif
 374 #endif /* TCP_CORK */
 375 #endif /* HAVE_DARWIN */
 376
 377 static unsigned on = 1, off = 0;
 378
 379 void buffer_output(void) {
 380 #ifdef HAVE_TCP_BUFFERING
 381 #ifdef HAVE_OPENSSL
 382         if (!CC->redirect_ssl)
 383 #endif
 384                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 385 #endif
 386 }
 387
 388 void unbuffer_output(void) {
 389 #ifdef HAVE_TCP_BUFFERING
 390 #ifdef HAVE_OPENSSL
 391         if (!CC->redirect_ssl)
 392 #endif
 393                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 394 #endif
 395 }
 396
 397 void flush_output(void) {
 398 #ifdef HAVE_TCP_BUFFERING
 399         struct CitContext *CCC = CC;
 400         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 401         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 402 #endif
 403 }
 404
 405 /*
 406 static void flush_client_inbuf(void)
 407 {
 408         CitContext *CCC=CC;
 409
 410         FlushStrBuf(CCC->ReadBuf);
 411         CCC->RecvBuf->ReadWritePointer = NULL;
 412
 413 }
 414 */
 415
 416
 417 /*
 418  * client_close()       ...     close the client socket
 419  */
 420 void client_close(void) {
 421         CitContext *CCC = CC;
 422         int r;
 423
 424         if (!CCC) return;
 425         if (CCC->client_socket <= 0) return;
 426         syslog(LOG_DEBUG, "Closing socket %d\n", CCC->client_socket);
 427         r = close(CCC->client_socket);
 428         if (!r) syslog(LOG_INFO, "close() failed: %s\n", strerror(errno));
 429         CCC->client_socket = -1 ;
 430 }
 431
 432
 433
 434
 435 /*
 436  * client_write()   ...    Send binary data to the client.
 437  */
 438 int client_write(const char *buf, int nbytes)
 439 {
 440         int bytes_written = 0;
 441         int retval;
 442 #ifndef HAVE_TCP_BUFFERING
 443         int old_buffer_len = 0;
 444 #endif
 445         fd_set wset;
 446         CitContext *Ctx;
 447         int fdflags;
 448
 449         if (nbytes < 1) return(0);
 450
 451         Ctx = CC;
 452
 453 #ifdef BIGBAD_IODBG
 454         {
 455                 int rv = 0;
 456                 char fn [SIZ];
 457                 FILE *fd;
 458
 459                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", Ctx->ServiceName, Ctx->cs_pid);
 460
 461                 fd = fopen(fn, "a+");
 462                 if (fd)
 463                 {
 464                     fprintf(fd, "Sending: BufSize: %d BufContent: [",
 465                             nbytes);
 466                     rv = fwrite(buf, nbytes, 1, fd);
 467                     fprintf(fd, "]\n");
 468                     fclose(fd);
 469                 }
 470         }
 471 #endif
 472 //      flush_client_inbuf();
 473         if (Ctx->redirect_buffer != NULL) {
 474                 StrBufAppendBufPlain(Ctx->redirect_buffer,
 475                                      buf, nbytes, 0);
 476                 return 0;
 477         }
 478
 479 #ifdef HAVE_OPENSSL
 480         if (Ctx->redirect_ssl) {
 481                 client_write_ssl(buf, nbytes);
 482                 return 0;
 483         }
 484 #endif
 485         if (Ctx->client_socket == -1) return -1;
 486
 487         fdflags = fcntl(Ctx->client_socket, F_GETFL);
 488
 489         while ((bytes_written < nbytes) && (Ctx->client_socket != -1)){
 490                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 491                         FD_ZERO(&wset);
 492                         FD_SET(Ctx->client_socket, &wset);
 493                         if (select(1, NULL, &wset, NULL, NULL) == -1) {
 494                                 if (errno == EINTR)
 495                                 {
 496                                         syslog(LOG_DEBUG, "client_write(%d bytes) select() interrupted.\n", nbytes-bytes_written);
 497                                         if (CtdlThreadCheckStop()) {
 498                                                 CC->kill_me = KILLME_SELECT_INTERRUPTED;
 499                                                 return (-1);
 500                                         } else {
 501                                                 /* can't trust fd's and stuff so we need to re-create them */
 502                                                 continue;
 503                                         }
 504                                 } else {
 505                                         syslog(LOG_ERR,
 506                                                 "client_write(%d bytes) select failed: %s (%d)\n",
 507                                                 nbytes - bytes_written,
 508                                                 strerror(errno), errno
 509                                         );
 510                                         cit_backtrace();
 511                                         client_close();
 512                                         Ctx->kill_me = KILLME_SELECT_FAILED;
 513                                         return -1;
 514                                 }
 515                         }
 516                 }
 517
 518                 retval = write(Ctx->client_socket, &buf[bytes_written], nbytes - bytes_written);
 519                 if (retval < 1) {
 520                         syslog(LOG_ERR,
 521                                 "client_write(%d bytes) failed: %s (%d)\n",
 522                                 nbytes - bytes_written,
 523                                 strerror(errno), errno
 524                         );
 525                         cit_backtrace();
 526                         client_close();
 527                         // syslog(LOG_DEBUG, "Tried to send: %s",  &buf[bytes_written]);
 528                         Ctx->kill_me = KILLME_WRITE_FAILED;
 529                         return -1;
 530                 }
 531                 bytes_written = bytes_written + retval;
 532         }
 533         return 0;
 534 }
 535
 536 void cputbuf(const StrBuf *Buf) {
 537         client_write(ChrPtr(Buf), StrLength(Buf));
 538 }
 539
 540
 541 /*
 542  * cprintf()    Send formatted printable data to the client.
 543  *              Implemented in terms of client_write() so it's technically not sysdep...
 544  */
 545 void cprintf(const char *format, ...) {
 546         va_list arg_ptr;
 547         char buf[1024];
 548
 549         va_start(arg_ptr, format);
 550         if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
 551                 buf[sizeof buf - 2] = '\n';
 552         client_write(buf, strlen(buf));
 553         va_end(arg_ptr);
 554 }
 555
 556
 557 /*
 558  * Read data from the client socket.
 559  *
 560  * sock         socket fd to read from
 561  * buf          buffer to read into
 562  * bytes        number of bytes to read
 563  * timeout      Number of seconds to wait before timing out
 564  *
 565  * Possible return values:
 566  *      1       Requested number of bytes has been read.
 567  *      0       Request timed out.
 568  *      -1      Connection is broken, or other error.
 569  */
 570 int client_read_blob(StrBuf *Target, int bytes, int timeout)
 571 {
 572         CitContext *CCC=CC;
 573         const char *Error;
 574         int retval = 0;
 575
 576 #ifdef HAVE_OPENSSL
 577         if (CCC->redirect_ssl) {
 578 #ifdef BIGBAD_IODBG
 579                 int rv = 0;
 580                 char fn [SIZ];
 581                 FILE *fd;
 582
 583                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 584
 585                 fd = fopen(fn, "a+");
 586                 fprintf(fd, "Reading BLOB: BufSize: %d ",
 587                         bytes);
 588                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 589                 fprintf(fd, "]\n");
 590
 591
 592                 fclose(fd);
 593 #endif
 594                 retval = client_read_sslblob(Target, bytes, timeout);
 595                 if (retval < 0) {
 596                         syslog(LOG_CRIT,
 597                                       "%s failed\n",
 598                                       __FUNCTION__);
 599                 }
 600 #ifdef BIGBAD_IODBG
 601                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 602
 603                 fd = fopen(fn, "a+");
 604                 fprintf(fd, "Read: %d BufContent: [",
 605                         StrLength(Target));
 606                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 607                 fprintf(fd, "]\n");
 608
 609
 610                 fclose(fd);
 611 #endif
 612         }
 613         else
 614 #endif
 615         {
 616 #ifdef BIGBAD_IODBG
 617                 int rv = 0;
 618                 char fn [SIZ];
 619                 FILE *fd;
 620
 621                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 622
 623                 fd = fopen(fn, "a+");
 624                 fprintf(fd, "Reading BLOB: BufSize: %d ",
 625                         bytes);
 626                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 627                 fprintf(fd, "]\n");
 628
 629
 630                 fclose(fd);
 631 #endif
 632                 retval = StrBufReadBLOBBuffered(Target,
 633                                                 CCC->RecvBuf.Buf,
 634                                                 &CCC->RecvBuf.ReadWritePointer,
 635                                                 &CCC->client_socket,
 636                                                 1,
 637                                                 bytes,
 638                                                 O_TERM,
 639                                                 &Error);
 640                 if (retval < 0) {
 641                         syslog(LOG_CRIT, "%s failed: %s\n", __FUNCTION__, Error);
 642                         client_close();
 643                         return retval;
 644                 }
 645 #ifdef BIGBAD_IODBG
 646                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 647
 648                 fd = fopen(fn, "a+");
 649                 fprintf(fd, "Read: %d BufContent: [",
 650                         StrLength(Target));
 651                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 652                 fprintf(fd, "]\n");
 653                 fclose(fd);
 654 #endif
 655         }
 656         return retval;
 657 }
 658
 659
 660 /*
 661  * to make client_read_random_blob() more efficient, increase buffer size.
 662  * just use in greeting function, else your buffer may be flushed
 663  */
 664 void client_set_inbound_buf(long N)
 665 {
 666         CitContext *CCC=CC;
 667         FlushStrBuf(CCC->RecvBuf.Buf);
 668         ReAdjustEmptyBuf(CCC->RecvBuf.Buf, N * SIZ, N * SIZ);
 669 }
 670
 671 int client_read_random_blob(StrBuf *Target, int timeout)
 672 {
 673         CitContext *CCC=CC;
 674         int rc;
 675
 676         rc =  client_read_blob(Target, 1, timeout);
 677         if (rc > 0)
 678         {
 679                 long len;
 680                 const char *pch;
 681
 682                 len = StrLength(CCC->RecvBuf.Buf);
 683                 pch = ChrPtr(CCC->RecvBuf.Buf);
 684
 685                 if (len > 0)
 686                 {
 687                         if (CCC->RecvBuf.ReadWritePointer != NULL) {
 688                                 len -= CCC->RecvBuf.ReadWritePointer - pch;
 689                                 pch = CCC->RecvBuf.ReadWritePointer;
 690                         }
 691                         StrBufAppendBufPlain(Target, pch, len, 0);
 692                         FlushStrBuf(CCC->RecvBuf.Buf);
 693                         CCC->RecvBuf.ReadWritePointer = NULL;
 694 #ifdef BIGBAD_IODBG
 695                         {
 696                                 int rv = 0;
 697                                 char fn [SIZ];
 698                                 FILE *fd;
 699
 700                                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 701
 702                                 fd = fopen(fn, "a+");
 703                                 fprintf(fd, "Read: BufSize: %d BufContent: [",
 704                                         StrLength(Target));
 705                                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 706                                 fprintf(fd, "]\n");
 707
 708
 709                                 fclose(fd);
 710                         }
 711 #endif
 712
 713                         return StrLength(Target);
 714                 }
 715                 return rc;
 716         }
 717         else
 718                 return rc;
 719 }
 720
 721 int client_read_to(char *buf, int bytes, int timeout)
 722 {
 723         CitContext *CCC=CC;
 724         int rc;
 725
 726         rc = client_read_blob(CCC->MigrateBuf, bytes, timeout);
 727         if (rc < 0)
 728         {
 729                 *buf = '\0';
 730                 return rc;
 731         }
 732         else
 733         {
 734                 memcpy(buf,
 735                        ChrPtr(CCC->MigrateBuf),
 736                        StrLength(CCC->MigrateBuf) + 1);
 737                 FlushStrBuf(CCC->MigrateBuf);
 738                 return rc;
 739         }
 740 }
 741
 742
 743 int HaveMoreLinesWaiting(CitContext *CCC)
 744 {
 745         if ((CCC->kill_me != 0) ||
 746             ( (CCC->RecvBuf.ReadWritePointer == NULL) &&
 747               (StrLength(CCC->RecvBuf.Buf) == 0) &&
 748               (CCC->client_socket != -1)) )
 749                 return 0;
 750         else
 751                 return 1;
 752 }
 753
 754
 755 /*
 756  * Read data from the client socket with default timeout.
 757  * (This is implemented in terms of client_read_to() and could be
 758  * justifiably moved out of sysdep.c)
 759  */
 760 INLINE int client_read(char *buf, int bytes)
 761 {
 762         return(client_read_to(buf, bytes, config.c_sleeping));
 763 }
 764
 765 int CtdlClientGetLine(StrBuf *Target)
 766 {
 767         CitContext *CCC=CC;
 768         const char *Error;
 769         int rc;
 770
 771         FlushStrBuf(Target);
 772 #ifdef HAVE_OPENSSL
 773         if (CCC->redirect_ssl) {
 774 #ifdef BIGBAD_IODBG
 775                 char fn [SIZ];
 776                 FILE *fd;
 777                 int len = 0;
 778                 int rlen = 0;
 779                 int  nlen = 0;
 780                 int nrlen = 0;
 781                 const char *pch;
 782
 783                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 784
 785                 fd = fopen(fn, "a+");
 786                 pch = ChrPtr(CCC->RecvBuf.Buf);
 787                 len = StrLength(CCC->RecvBuf.Buf);
 788                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 789                         rlen = CCC->RecvBuf.ReadWritePointer - pch;
 790                 else
 791                         rlen = 0;
 792
 793 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 794                         len, rlen, pch);
 795 */
 796                 fprintf(fd, "\n\n\nSSL1: BufSize: %d BufPos: %d \n_____________________\n",
 797                         len, rlen);
 798 #endif
 799                 rc = client_readline_sslbuffer(Target,
 800                                                CCC->RecvBuf.Buf,
 801                                                &CCC->RecvBuf.ReadWritePointer,
 802                                                1);
 803 #ifdef BIGBAD_IODBG
 804                 pch = ChrPtr(CCC->RecvBuf.Buf);
 805                 nlen = StrLength(CCC->RecvBuf.Buf);
 806                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 807                         nrlen = CCC->RecvBuf.ReadWritePointer - pch;
 808                 else
 809                         nrlen = 0;
 810 /*
 811                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 812                         len, nlen, rlen, nrlen, pch);
 813 */
 814                 fprintf(fd, "\n\n\nSSL2: BufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 815                         len, nlen, rlen, nrlen);
 816
 817                 fprintf(fd, "SSL3: Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 818                         StrLength(Target), ChrPtr(Target));
 819                 fclose(fd);
 820
 821                 if (rc < 0)
 822                         syslog(LOG_CRIT,
 823                                       "%s failed\n",
 824                                       __FUNCTION__);
 825 #endif
 826                 return rc;
 827         }
 828         else
 829 #endif
 830         {
 831 #ifdef BIGBAD_IODBG
 832                 char fn [SIZ];
 833                 FILE *fd;
 834                 int len, rlen, nlen, nrlen;
 835                 const char *pch;
 836
 837                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 838
 839                 fd = fopen(fn, "a+");
 840                 pch = ChrPtr(CCC->RecvBuf.Buf);
 841                 len = StrLength(CCC->RecvBuf.Buf);
 842                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 843                         rlen = CCC->RecvBuf.ReadWritePointer - pch;
 844                 else
 845                         rlen = 0;
 846
 847 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 848                         len, rlen, pch);
 849 */
 850                 fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \n_____________________\n",
 851                         len, rlen);
 852 #endif
 853                 rc = StrBufTCP_read_buffered_line_fast(Target,
 854                                                        CCC->RecvBuf.Buf,
 855                                                        &CCC->RecvBuf.ReadWritePointer,
 856                                                        &CCC->client_socket,
 857                                                        5,
 858                                                        1,
 859                                                        &Error);
 860
 861 #ifdef BIGBAD_IODBG
 862                 pch = ChrPtr(CCC->RecvBuf.Buf);
 863                 nlen = StrLength(CCC->RecvBuf.Buf);
 864                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 865                         nrlen = CCC->RecvBuf.ReadWritePointer - pch;
 866                 else
 867                         nrlen = 0;
 868 /*
 869                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 870                         len, nlen, rlen, nrlen, pch);
 871 */
 872                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 873                         len, nlen, rlen, nrlen);
 874
 875                 fprintf(fd, "Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 876                         StrLength(Target), ChrPtr(Target));
 877                 fclose(fd);
 878
 879                 if ((rc < 0) && (Error != NULL))
 880                         syslog(LOG_CRIT,
 881                                       "%s failed: %s\n",
 882                                       __FUNCTION__,
 883                                       Error);
 884 #endif
 885                 return rc;
 886         }
 887 }
 888
 889
 890 /*
 891  * client_getln()   ...   Get a LF-terminated line of text from the client.
 892  * (This is implemented in terms of client_read() and could be
 893  * justifiably moved out of sysdep.c)
 894  */
 895 int client_getln(char *buf, int bufsize)
 896 {
 897         int i, retval;
 898         CitContext *CCC=CC;
 899         const char *pCh;
 900
 901         retval = CtdlClientGetLine(CCC->MigrateBuf);
 902         if (retval < 0)
 903           return(retval >= 0);
 904
 905
 906         i = StrLength(CCC->MigrateBuf);
 907         pCh = ChrPtr(CCC->MigrateBuf);
 908         /* Strip the trailing LF, and the trailing CR if present.
 909          */
 910         if (bufsize <= i)
 911                 i = bufsize - 1;
 912         while ( (i > 0)
 913                 && ( (pCh[i - 1]==13)
 914                      || ( pCh[i - 1]==10)) ) {
 915                 i--;
 916         }
 917         memcpy(buf, pCh, i);
 918         buf[i] = 0;
 919
 920         FlushStrBuf(CCC->MigrateBuf);
 921         if (retval < 0) {
 922                 safestrncpy(&buf[i], "000", bufsize - i);
 923         }
 924         return(retval >= 0);
 925 }
 926
 927
 928 /*
 929  * Cleanup any contexts that are left lying around
 930  */
 931
 932
 933 void close_masters (void)
 934 {
 935         struct ServiceFunctionHook *serviceptr;
 936
 937         /*
 938          * close all protocol master sockets
 939          */
 940         for (serviceptr = ServiceHookTable; serviceptr != NULL;
 941             serviceptr = serviceptr->next ) {
 942
 943                 if (serviceptr->tcp_port > 0)
 944                 {
 945                         syslog(LOG_INFO, "Closing listener on port %d\n",
 946                                 serviceptr->tcp_port);
 947                         serviceptr->tcp_port = 0;
 948                 }
 949
 950                 if (serviceptr->sockpath != NULL)
 951                         syslog(LOG_INFO, "Closing listener on '%s'\n",
 952                                 serviceptr->sockpath);
 953
 954                 close(serviceptr->msock);
 955                 /* If it's a Unix domain socket, remove the file. */
 956                 if (serviceptr->sockpath != NULL) {
 957                         unlink(serviceptr->sockpath);
 958                         serviceptr->sockpath = NULL;
 959                 }
 960         }
 961 }
 962
 963
 964 /*
 965  * The system-dependent part of master_cleanup() - close the master socket.
 966  */
 967 void sysdep_master_cleanup(void) {
 968
 969         close_masters();
 970
 971         context_cleanup();
 972
 973 #ifdef HAVE_OPENSSL
 974         destruct_ssl();
 975 #endif
 976         CtdlDestroyProtoHooks();
 977         CtdlDestroyDeleteHooks();
 978         CtdlDestroyXmsgHooks();
 979         CtdlDestroyNetprocHooks();
 980         CtdlDestroyUserHooks();
 981         CtdlDestroyMessageHook();
 982         CtdlDestroyCleanupHooks();
 983         CtdlDestroyFixedOutputHooks();
 984         CtdlDestroySessionHooks();
 985         CtdlDestroyServiceHook();
 986         CtdlDestroyRoomHooks();
 987         CtdlDestroySearchHooks();
 988         #ifdef HAVE_BACKTRACE
 989 ///     eCrash_Uninit();
 990         #endif
 991 }
 992
 993
 994
 995 pid_t current_child;
 996 void graceful_shutdown(int signum) {
 997         kill(current_child, signum);
 998         unlink(file_pid_file);
 999         exit(0);
1000 }
1001
1002 int nFireUps = 0;
1003 int nFireUpsNonRestart = 0;
1004 pid_t ForkedPid = 1;
1005
1006 /*
1007  * Start running as a daemon.
1008  */
1009 void start_daemon(int unused) {
1010         int status = 0;
1011         pid_t child = 0;
1012         FILE *fp;
1013         int do_restart = 0;
1014
1015         current_child = 0;
1016
1017         /* Close stdin/stdout/stderr and replace them with /dev/null.
1018          * We don't just call close() because we don't want these fd's
1019          * to be reused for other files.
1020          */
1021         if (chdir(ctdl_run_dir) != 0)
1022                 syslog(LOG_EMERG,
1023                               "unable to change into directory [%s]: %s",
1024                               ctdl_run_dir, strerror(errno));
1025
1026         child = fork();
1027         if (child != 0) {
1028                 exit(0);
1029         }
1030
1031         signal(SIGHUP, SIG_IGN);
1032         signal(SIGINT, SIG_IGN);
1033         signal(SIGQUIT, SIG_IGN);
1034
1035         setsid();
1036         umask(0);
1037         if ((freopen("/dev/null", "r", stdin) != stdin) ||
1038             (freopen("/dev/null", "w", stdout) != stdout) ||
1039             (freopen("/dev/null", "w", stderr) != stderr))
1040                 syslog(LOG_EMERG,
1041                               "unable to reopen stdin/out/err %s",
1042                               strerror(errno));
1043
1044
1045         do {
1046                 current_child = fork();
1047
1048                 signal(SIGTERM, graceful_shutdown);
1049
1050                 if (current_child < 0) {
1051                         perror("fork");
1052                         exit(errno);
1053                 }
1054
1055                 else if (current_child == 0) {
1056                         return; /* continue starting citadel. */
1057                 }
1058
1059                 else {
1060                         fp = fopen(file_pid_file, "w");
1061                         if (fp != NULL) {
1062                                 fprintf(fp, ""F_PID_T"\n", getpid());
1063                                 fclose(fp);
1064                         }
1065                         waitpid(current_child, &status, 0);
1066                 }
1067                 do_restart = 0;
1068                 nFireUpsNonRestart = nFireUps;
1069
1070                 /* Exit code 0 means the watcher should exit */
1071                 if (WIFEXITED(status) && (WEXITSTATUS(status) == CTDLEXIT_SHUTDOWN)) {
1072                         do_restart = 0;
1073                 }
1074
1075                 /* Exit code 101-109 means the watcher should exit */
1076                 else if (WIFEXITED(status) && (WEXITSTATUS(status) >= 101) && (WEXITSTATUS(status) <= 109)) {
1077                         do_restart = 0;
1078                 }
1079
1080                 /* Any other exit code, or no exit code, means we should restart. */
1081                 else {
1082                         do_restart = 1;
1083                         nFireUps++;
1084                         ForkedPid = current_child;
1085                 }
1086
1087         } while (do_restart);
1088
1089         unlink(file_pid_file);
1090         exit(WEXITSTATUS(status));
1091 }
1092
1093
1094
1095 void checkcrash(void)
1096 {
1097         if (nFireUpsNonRestart != nFireUps)
1098         {
1099                 StrBuf *CrashMail;
1100
1101                 CrashMail = NewStrBuf();
1102                 syslog(LOG_ALERT, "Posting crash message\n");
1103                 StrBufPrintf(CrashMail,
1104                         " \n"
1105                         " The Citadel server process (citserver) terminated unexpectedly."
1106                         "\n \n"
1107                         " This could be the result of a bug in the server program, or some external "
1108                         "factor.\n \n"
1109                         " You can obtain more information about this by enabling core dumps.\n \n"
1110                         " For more information, please see:\n \n"
1111                         " http://citadel.org/doku.php/faq:mastering_your_os:gdb#how.do.i.make.my.system.produce.core-files"
1112                         "\n \n"
1113
1114                         " If you have already done this, the core dump is likely to be found at %score.%d\n"
1115                         ,
1116                         ctdl_run_dir, ForkedPid);
1117                 CtdlAideMessage(ChrPtr(CrashMail), "Citadel server process terminated unexpectedly");
1118                 FreeStrBuf(&CrashMail);
1119         }
1120 }
1121
1122
1123 /*
1124  * Generic routine to convert a login name to a full name (gecos)
1125  * Returns nonzero if a conversion took place
1126  */
1127 int convert_login(char NameToConvert[]) {
1128         struct passwd *pw;
1129         int a;
1130
1131         pw = getpwnam(NameToConvert);
1132         if (pw == NULL) {
1133                 return(0);
1134         }
1135         else {
1136                 strcpy(NameToConvert, pw->pw_gecos);
1137                 for (a=0; a<strlen(NameToConvert); ++a) {
1138                         if (NameToConvert[a] == ',') NameToConvert[a] = 0;
1139                 }
1140                 return(1);
1141         }
1142 }
1143
1144
1145
1146 /*
1147  * This loop just keeps going and going and going...
1148  */
1149 void *worker_thread(void *arg) {
1150         int highest;
1151         CitContext *ptr;
1152         CitContext *bind_me = NULL;
1153         fd_set readfds;
1154         int retval = 0;
1155         struct timeval tv;
1156         int force_purge = 0;
1157
1158
1159         while (!CtdlThreadCheckStop()) {
1160
1161                 /* make doubly sure we're not holding any stale db handles
1162                  * which might cause a deadlock.
1163                  */
1164                 cdb_check_handles();
1165 do_select:      force_purge = 0;
1166                 bind_me = NULL;         /* Which session shall we handle? */
1167
1168                 /* Initialize the fdset. */
1169                 FD_ZERO(&readfds);
1170                 highest = 0;
1171
1172                 begin_critical_section(S_SESSION_TABLE);
1173                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1174                         if ((ptr->state == CON_SYS) && (ptr->client_socket == 0))
1175                             continue;
1176
1177                         /* Don't select on dead sessions, only truly idle ones */
1178                         if (    (ptr->state == CON_IDLE)
1179                                 && (ptr->kill_me == 0)
1180                                 && (ptr->client_socket > 0)
1181                         ) {
1182                                 FD_SET(ptr->client_socket, &readfds);
1183                                 if (ptr->client_socket > highest)
1184                                         highest = ptr->client_socket;
1185                         }
1186                         if ((bind_me == NULL) && (ptr->state == CON_READY)) {
1187                                 bind_me = ptr;
1188                                 ptr->state = CON_EXECUTING;
1189                                 break;
1190                         }
1191                         if ((bind_me == NULL) && (ptr->state == CON_GREETING)) {
1192                                 bind_me = ptr;
1193                                 ptr->state = CON_STARTING;
1194                                 break;
1195                         }
1196                 }
1197                 end_critical_section(S_SESSION_TABLE);
1198
1199                 if (bind_me) {
1200                         goto SKIP_SELECT;
1201                 }
1202
1203                 /* If we got this far, it means that there are no sessions
1204                  * which a previous thread marked for attention, so we go
1205                  * ahead and get ready to select().
1206                  */
1207
1208                 if (!CtdlThreadCheckStop()) {
1209                         tv.tv_sec = 1;          /* wake up every second if no input */
1210                         tv.tv_usec = 0;
1211                         retval = CtdlThreadSelect(highest + 1, &readfds, NULL, NULL, &tv);
1212                 }
1213                 else
1214                         return NULL;
1215
1216                 /* Now figure out who made this select() unblock.
1217                  * First, check for an error or exit condition.
1218                  */
1219                 if (retval < 0) {
1220                         if (errno == EBADF) {
1221                                 syslog(LOG_NOTICE, "select() failed: (%s)\n",
1222                                         strerror(errno));
1223                                 goto do_select;
1224                         }
1225                         if (errno != EINTR) {
1226                                 syslog(LOG_EMERG, "Exiting (%s)\n", strerror(errno));
1227                                 CtdlThreadStopAll();
1228                                 continue;
1229                         } else {
1230 #if 0
1231                                 syslog(LOG_DEBUG, "Interrupted CtdlThreadSelect.\n");
1232 #endif
1233                                 if (CtdlThreadCheckStop()) return(NULL);
1234                                 goto do_select;
1235                         }
1236                 }
1237                 else if(retval == 0) {
1238                         if (CtdlThreadCheckStop()) return(NULL);
1239                 }
1240
1241                 /* It must be a client socket.  Find a context that has data
1242                  * waiting on its socket *and* is in the CON_IDLE state.  Any
1243                  * active sockets other than our chosen one are marked as
1244                  * CON_READY so the next thread that comes around can just bind
1245                  * to one without having to select() again.
1246                  */
1247                 begin_critical_section(S_SESSION_TABLE);
1248                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1249                         int checkfd = ptr->client_socket;
1250                         if ((checkfd != -1) && (ptr->state == CON_IDLE) ){
1251                                 if (FD_ISSET(checkfd, &readfds)) {
1252                                         ptr->input_waiting = 1;
1253                                         if (!bind_me) {
1254                                                 bind_me = ptr;  /* I choose you! */
1255                                                 bind_me->state = CON_EXECUTING;
1256                                         }
1257                                         else {
1258                                                 ptr->state = CON_READY;
1259                                         }
1260                                 } else if ((ptr->is_async) && (ptr->async_waiting) && (ptr->h_async_function)) {
1261                                         if (!bind_me) {
1262                                                 bind_me = ptr;  /* I choose you! */
1263                                                 bind_me->state = CON_EXECUTING;
1264                                         }
1265                                         else {
1266                                                 ptr->state = CON_READY;
1267                                         }
1268                                 }
1269                         }
1270                 }
1271                 end_critical_section(S_SESSION_TABLE);
1272
1273 SKIP_SELECT:
1274                 /* We're bound to a session */
1275                 if (bind_me != NULL) {
1276                         become_session(bind_me);
1277
1278                         if (bind_me->state == CON_STARTING) {
1279                                 bind_me->state = CON_EXECUTING;
1280                                 begin_session(bind_me);
1281                                 bind_me->h_greeting_function();
1282                         }
1283                         /* If the client has sent a command, execute it. */
1284                         if (CC->input_waiting) {
1285                                 CC->h_command_function();
1286
1287                                 while (HaveMoreLinesWaiting(CC))
1288                                        CC->h_command_function();
1289
1290                                 CC->input_waiting = 0;
1291                         }
1292
1293                         /* If there are asynchronous messages waiting and the
1294                          * client supports it, do those now */
1295                         if ((CC->is_async) && (CC->async_waiting)
1296                            && (CC->h_async_function != NULL)) {
1297                                 CC->h_async_function();
1298                                 CC->async_waiting = 0;
1299                         }
1300
1301                         force_purge = CC->kill_me;
1302                         become_session(NULL);
1303                         bind_me->state = CON_IDLE;
1304                 }
1305
1306                 dead_session_purge(force_purge);
1307                 do_housekeeping();
1308         }
1309         /* If control reaches this point, the server is shutting down */
1310         return(NULL);
1311 }
1312
1313
1314
1315
1316 /*
1317  * A function to handle selecting on master sockets.
1318  * In other words it handles new connections.
1319  * It is a thread.
1320  */
1321 void *select_on_master (void *arg)
1322 {
1323         struct ServiceFunctionHook *serviceptr;
1324         fd_set master_fds;
1325         int highest;
1326         struct timeval tv;
1327         int ssock;                      /* Descriptor for client socket */
1328         CitContext *con= NULL;  /* Temporary context pointer */
1329         int m;
1330         int i;
1331         int retval;
1332         struct CitContext select_on_master_CC;
1333
1334         CtdlFillSystemContext(&select_on_master_CC, "select_on_master");
1335         citthread_setspecific(MyConKey, (void *)&select_on_master_CC);
1336
1337         while (!CtdlThreadCheckStop()) {
1338                 /* Initialize the fdset. */
1339                 FD_ZERO(&master_fds);
1340                 highest = 0;
1341
1342                 /* First, add the various master sockets to the fdset. */
1343                 for (serviceptr = ServiceHookTable; serviceptr != NULL;
1344                 serviceptr = serviceptr->next ) {
1345                         m = serviceptr->msock;
1346                         FD_SET(m, &master_fds);
1347                         if (m > highest) {
1348                                 highest = m;
1349                         }
1350                 }
1351
1352                 if (!CtdlThreadCheckStop()) {
1353                         tv.tv_sec = 60;         /* wake up every second if no input */
1354                         tv.tv_usec = 0;
1355                         retval = CtdlThreadSelect(highest + 1, &master_fds, NULL, NULL, &tv);
1356                 }
1357                 else
1358                         return NULL;
1359
1360                 /* Now figure out who made this select() unblock.
1361                  * First, check for an error or exit condition.
1362                  */
1363                 if (retval < 0) {
1364                         if (errno == EBADF) {
1365                                 syslog(LOG_NOTICE, "select() failed: (%s)\n",
1366                                         strerror(errno));
1367                                 continue;
1368                         }
1369                         if (errno != EINTR) {
1370                                 syslog(LOG_EMERG, "Exiting (%s)\n", strerror(errno));
1371                                 CtdlThreadStopAll();
1372                         } else {
1373 #if 0
1374                                 syslog(LOG_DEBUG, "Interrupted CtdlThreadSelect.\n");
1375 #endif
1376                                 if (CtdlThreadCheckStop()) return(NULL);
1377                                 continue;
1378                         }
1379                 }
1380                 else if(retval == 0) {
1381                         if (CtdlThreadCheckStop()) return(NULL);
1382                         continue;
1383                 }
1384                 /* Next, check to see if it's a new client connecting
1385                  * on a master socket.
1386                  */
1387                 else for (serviceptr = ServiceHookTable; serviceptr != NULL;
1388                      serviceptr = serviceptr->next ) {
1389
1390                         if (FD_ISSET(serviceptr->msock, &master_fds)) {
1391                                 ssock = accept(serviceptr->msock, NULL, 0);
1392                                 if (ssock >= 0) {
1393                                         syslog(LOG_DEBUG, "New client socket %d\n", ssock);
1394
1395                                         /* The master socket is non-blocking but the client
1396                                          * sockets need to be blocking, otherwise certain
1397                                          * operations barf on FreeBSD.  Not a fatal error.
1398                                          */
1399                                         if (fcntl(ssock, F_SETFL, 0) < 0) {
1400                                                 syslog(LOG_EMERG,
1401                                                         "citserver: Can't set socket to blocking: %s\n",
1402                                                         strerror(errno));
1403                                         }
1404
1405                                         /* New context will be created already
1406                                          * set up in the CON_EXECUTING state.
1407                                          */
1408                                         con = CreateNewContext();
1409
1410                                         /* Assign our new socket number to it. */
1411                                         con->client_socket = ssock;
1412                                         con->h_command_function = serviceptr->h_command_function;
1413                                         con->h_async_function = serviceptr->h_async_function;
1414                                         con->h_greeting_function = serviceptr->h_greeting_function;
1415                                         con->ServiceName = serviceptr->ServiceName;
1416
1417                                         /* Determine whether it's a local socket */
1418                                         if (serviceptr->sockpath != NULL) {
1419                                                 con->is_local_socket = 1;
1420                                         }
1421
1422                                         /* Set the SO_REUSEADDR socket option */
1423                                         i = 1;
1424                                         setsockopt(ssock, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
1425                                         con->state = CON_GREETING;
1426                                         retval--;
1427                                         if (retval == 0)
1428                                                 break;
1429                                 }
1430                         }
1431                 }
1432         }
1433         CtdlClearSystemContext();
1434
1435         return NULL;
1436 }
1437
1438
1439
1440 /*
1441  * SyslogFacility()
1442  * Translate text facility name to syslog.h defined value.
1443  */
1444 int SyslogFacility(char *name)
1445 {
1446         int i;
1447         struct
1448         {
1449                 int facility;
1450                 char *name;
1451         }   facTbl[] =
1452         {
1453                 {   LOG_KERN,   "kern"          },
1454                 {   LOG_USER,   "user"          },
1455                 {   LOG_MAIL,   "mail"          },
1456                 {   LOG_DAEMON, "daemon"        },
1457                 {   LOG_AUTH,   "auth"          },
1458                 {   LOG_SYSLOG, "syslog"        },
1459                 {   LOG_LPR,    "lpr"           },
1460                 {   LOG_NEWS,   "news"          },
1461                 {   LOG_UUCP,   "uucp"          },
1462                 {   LOG_LOCAL0, "local0"        },
1463                 {   LOG_LOCAL1, "local1"        },
1464                 {   LOG_LOCAL2, "local2"        },
1465                 {   LOG_LOCAL3, "local3"        },
1466                 {   LOG_LOCAL4, "local4"        },
1467                 {   LOG_LOCAL5, "local5"        },
1468                 {   LOG_LOCAL6, "local6"        },
1469                 {   LOG_LOCAL7, "local7"        },
1470                 {   0,            NULL          }
1471         };
1472         for(i = 0; facTbl[i].name != NULL; i++) {
1473                 if(!strcasecmp(name, facTbl[i].name))
1474                         return facTbl[i].facility;
1475         }
1476         return LOG_DAEMON;
1477 }