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) 1987-2015 by the citadel.org team
  11  *
  12  * This program is open source software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License, version 3.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  */
  20
  21 #include "sysdep.h"
  22
  23 #include <errno.h>
  24 #include <signal.h>
  25 #include <stdio.h>
  26 #include <syslog.h>
  27 #include <sys/syslog.h>
  28
  29
  30 #include <sys/un.h>
  31 #include <sys/types.h>
  32 #include <sys/socket.h>
  33 #include <netinet/in.h>
  34 #include <arpa/inet.h>
  35 #include <netinet/tcp.h>
  36 #include <arpa/inet.h>
  37
  38 #define SHOW_ME_VAPPEND_PRINTF
  39 #include <libcitadel.h>
  40
  41 #include "citserver.h"
  42 #include "config.h"
  43 #include "ctdl_module.h"
  44
  45 #include "sysdep_decls.h"
  46 #include "modules/crypto/serv_crypto.h" /* Needed for init_ssl, client_write_ssl, client_read_ssl, destruct_ssl */
  47
  48 #include "housekeeping.h"
  49 #include "context.h"
  50 /*
  51  * Signal handler to shut down the server.
  52  */
  53
  54 volatile int exit_signal = 0;
  55 volatile int shutdown_and_halt = 0;
  56 volatile int restart_server = 0;
  57 volatile int running_as_daemon = 0;
  58
  59 static RETSIGTYPE signal_cleanup(int signum) {
  60         syslog(LOG_DEBUG, "Caught signal %d; shutting down.", signum);
  61         exit_signal = signum;
  62         server_shutting_down = 1;
  63 }
  64
  65 static RETSIGTYPE signal_exit(int signum) {
  66         exit(1);
  67 }
  68
  69
  70
  71 /*
  72  * Some initialization stuff...
  73  */
  74 void init_sysdep(void) {
  75         sigset_t set;
  76
  77         /* Avoid vulnerabilities related to FD_SETSIZE if we can. */
  78 #ifdef FD_SETSIZE
  79 #ifdef RLIMIT_NOFILE
  80         struct rlimit rl;
  81         getrlimit(RLIMIT_NOFILE, &rl);
  82         rl.rlim_cur = FD_SETSIZE;
  83         rl.rlim_max = FD_SETSIZE;
  84         setrlimit(RLIMIT_NOFILE, &rl);
  85 #endif
  86 #endif
  87
  88         /* If we've got OpenSSL, we're going to use it. */
  89 #ifdef HAVE_OPENSSL
  90         init_ssl();
  91 #endif
  92
  93         /*
  94          * Set up a place to put thread-specific data.
  95          * We only need a single pointer per thread - it points to the
  96          * CitContext structure (in the ContextList linked list) of the
  97          * session to which the calling thread is currently bound.
  98          */
  99         if (pthread_key_create(&MyConKey, NULL) != 0) {
 100                 syslog(LOG_CRIT, "Can't create TSD key: %s", strerror(errno));
 101         }
 102
 103         /*
 104          * Interript, hangup, and terminate signals should cause the server
 105          * to gracefully clean up and shut down.
 106          */
 107         sigemptyset(&set);
 108         sigaddset(&set, SIGINT);
 109         sigaddset(&set, SIGHUP);
 110         sigaddset(&set, SIGTERM);
 111         sigprocmask(SIG_UNBLOCK, &set, NULL);
 112
 113         signal(SIGINT, signal_cleanup);
 114         signal(SIGHUP, signal_cleanup);
 115         signal(SIGTERM, signal_cleanup);
 116         signal(SIGUSR2, signal_exit);
 117
 118         /*
 119          * Do not shut down the server on broken pipe signals, otherwise the
 120          * whole Citadel service would come down whenever a single client
 121          * socket breaks.
 122          */
 123         signal(SIGPIPE, SIG_IGN);
 124 }
 125
 126
 127 /*
 128  * This is a generic function to set up a master socket for listening on
 129  * a TCP port.  The server shuts down if the bind fails.  (IPv4/IPv6 version)
 130  *
 131  * ip_addr      IP address to bind
 132  * port_number  port number to bind
 133  * queue_len    number of incoming connections to allow in the queue
 134  */
 135 int ctdl_tcp_server(char *ip_addr, int port_number, int queue_len, char *errormessage)
 136 {
 137         struct protoent *p;
 138         struct sockaddr_in6 sin6;
 139         struct sockaddr_in sin4;
 140         int s, i, b;
 141         int ip_version = 6;
 142
 143         memset(&sin6, 0, sizeof(sin6));
 144         memset(&sin4, 0, sizeof(sin4));
 145         sin6.sin6_family = AF_INET6;
 146         sin4.sin_family = AF_INET;
 147
 148         if (    (ip_addr == NULL)                                                       /* any IPv6 */
 149                 || (IsEmptyStr(ip_addr))
 150                 || (!strcmp(ip_addr, "*"))
 151         ) {
 152                 ip_version = 6;
 153                 sin6.sin6_addr = in6addr_any;
 154         }
 155         else if (!strcmp(ip_addr, "0.0.0.0"))                                           /* any IPv4 */
 156         {
 157                 ip_version = 4;
 158                 sin4.sin_addr.s_addr = INADDR_ANY;
 159         }
 160         else if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':')))                     /* specific IPv4 */
 161         {
 162                 ip_version = 4;
 163                 if (inet_pton(AF_INET, ip_addr, &sin4.sin_addr) <= 0) {
 164                         snprintf(errormessage, SIZ,
 165                                  "Error binding to [%s] : %s", ip_addr, strerror(errno)
 166                         );
 167                         syslog(LOG_ALERT, "%s", errormessage);
 168                         return (-1);
 169                 }
 170         }
 171         else                                                                            /* specific IPv6 */
 172         {
 173                 ip_version = 6;
 174                 if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
 175                         snprintf(errormessage, SIZ,
 176                                  "Error binding to [%s] : %s", ip_addr, strerror(errno)
 177                         );
 178                         syslog(LOG_ALERT, "%s", errormessage);
 179                         return (-1);
 180                 }
 181         }
 182
 183         if (port_number == 0) {
 184                 snprintf(errormessage, SIZ, "Can't start: no port number specified.");
 185                 syslog(LOG_ALERT, "%s", errormessage);
 186                 return (-1);
 187         }
 188         sin6.sin6_port = htons((u_short) port_number);
 189         sin4.sin_port = htons((u_short) port_number);
 190
 191         p = getprotobyname("tcp");
 192
 193         s = socket( ((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
 194         if (s < 0) {
 195                 snprintf(errormessage, SIZ,
 196                          "Can't create a listening socket: %s", strerror(errno)
 197                 );
 198                 syslog(LOG_ALERT, "%s", errormessage);
 199                 return (-1);
 200         }
 201         /* Set some socket options that make sense. */
 202         i = 1;
 203         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 204
 205         if (ip_version == 6) {
 206                 b = bind(s, (struct sockaddr *) &sin6, sizeof(sin6));
 207         }
 208         else {
 209                 b = bind(s, (struct sockaddr *) &sin4, sizeof(sin4));
 210         }
 211
 212         if (b < 0) {
 213                 snprintf(errormessage, SIZ,
 214                          "Can't bind: %s", strerror(errno)
 215                 );
 216                 syslog(LOG_ALERT, "%s", errormessage);
 217                 return (-1);
 218         }
 219
 220         fcntl(s, F_SETFL, O_NONBLOCK);
 221
 222         if (listen(s, ((queue_len >= 5) ? queue_len : 5) ) < 0) {
 223                 snprintf(errormessage, SIZ,
 224                          "Can't listen: %s", strerror(errno)
 225                 );
 226                 syslog(LOG_ALERT, "%s", errormessage);
 227                 return (-1);
 228         }
 229         return (s);
 230 }
 231
 232
 233
 234
 235
 236 /*
 237  * Create a Unix domain socket and listen on it
 238  */
 239 int ctdl_uds_server(char *sockpath, int queue_len, char *errormessage)
 240 {
 241         struct sockaddr_un addr;
 242         int s;
 243         int i;
 244         int actual_queue_len;
 245 #ifdef HAVE_STRUCT_UCRED
 246         int passcred = 1;
 247 #endif
 248
 249         actual_queue_len = queue_len;
 250         if (actual_queue_len < 5) actual_queue_len = 5;
 251
 252         i = unlink(sockpath);
 253         if ((i != 0) && (errno != ENOENT)) {
 254                 snprintf(errormessage, SIZ, "citserver: can't unlink %s: %s",
 255                         sockpath, strerror(errno)
 256                 );
 257                 syslog(LOG_EMERG, "%s", errormessage);
 258                 return(-1);
 259         }
 260
 261         memset(&addr, 0, sizeof(addr));
 262         addr.sun_family = AF_UNIX;
 263         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 264
 265         s = socket(AF_UNIX, SOCK_STREAM, 0);
 266         if (s < 0) {
 267                 snprintf(errormessage, SIZ,
 268                          "citserver: Can't create a socket: %s",
 269                          strerror(errno));
 270                 syslog(LOG_EMERG, "%s", errormessage);
 271                 return(-1);
 272         }
 273
 274         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 275                 snprintf(errormessage, SIZ,
 276                          "citserver: Can't bind: %s",
 277                          strerror(errno));
 278                 syslog(LOG_EMERG, "%s", errormessage);
 279                 return(-1);
 280         }
 281
 282         /* set to nonblock - we need this for some obscure situations */
 283         if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
 284                 snprintf(errormessage, SIZ,
 285                          "citserver: Can't set socket to non-blocking: %s",
 286                          strerror(errno));
 287                 syslog(LOG_EMERG, "%s", errormessage);
 288                 close(s);
 289                 return(-1);
 290         }
 291
 292         if (listen(s, actual_queue_len) < 0) {
 293                 snprintf(errormessage, SIZ,
 294                          "citserver: Can't listen: %s",
 295                          strerror(errno));
 296                 syslog(LOG_EMERG, "%s", errormessage);
 297                 return(-1);
 298         }
 299
 300 #ifdef HAVE_STRUCT_UCRED
 301         setsockopt(s, SOL_SOCKET, SO_PASSCRED, &passcred, sizeof(passcred));
 302 #endif
 303
 304         chmod(sockpath, S_ISGID|S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
 305         return(s);
 306 }
 307
 308
 309
 310 /*
 311  * The following functions implement output buffering on operating systems which
 312  * support it (such as Linux and various BSD flavors).
 313  */
 314 #ifndef HAVE_DARWIN
 315 #ifdef TCP_CORK
 316 #       define HAVE_TCP_BUFFERING
 317 #else
 318 #       ifdef TCP_NOPUSH
 319 #               define HAVE_TCP_BUFFERING
 320 #               define TCP_CORK TCP_NOPUSH
 321 #       endif
 322 #endif /* TCP_CORK */
 323 #endif /* HAVE_DARWIN */
 324
 325 static unsigned on = 1, off = 0;
 326
 327 void buffer_output(void) {
 328 #ifdef HAVE_TCP_BUFFERING
 329 #ifdef HAVE_OPENSSL
 330         if (!CC->redirect_ssl)
 331 #endif
 332                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 333 #endif
 334 }
 335
 336 void unbuffer_output(void) {
 337 #ifdef HAVE_TCP_BUFFERING
 338 #ifdef HAVE_OPENSSL
 339         if (!CC->redirect_ssl)
 340 #endif
 341                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 342 #endif
 343 }
 344
 345 void flush_output(void) {
 346 #ifdef HAVE_TCP_BUFFERING
 347         struct CitContext *CCC = CC;
 348         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 349         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 350 #endif
 351 }
 352
 353 /*
 354 static void flush_client_inbuf(void)
 355 {
 356         CitContext *CCC=CC;
 357
 358         FlushStrBuf(CCC->ReadBuf);
 359         CCC->RecvBuf->ReadWritePointer = NULL;
 360
 361 }
 362 */
 363
 364
 365 /*
 366  * client_close()       ...     close the client socket
 367  */
 368 void client_close(void) {
 369         CitContext *CCC = CC;
 370
 371         if (!CCC) return;
 372         if (CCC->client_socket <= 0) return;
 373         syslog(LOG_DEBUG, "Closing socket %d", CCC->client_socket);
 374
 375         close(CCC->client_socket);
 376         CCC->client_socket = -1 ;
 377 }
 378
 379
 380
 381
 382 /*
 383  * client_write()   ...    Send binary data to the client.
 384  */
 385 int client_write(const char *buf, int nbytes)
 386 {
 387         int bytes_written = 0;
 388         int retval;
 389 #ifndef HAVE_TCP_BUFFERING
 390         int old_buffer_len = 0;
 391 #endif
 392         fd_set wset;
 393         CitContext *Ctx;
 394         int fdflags;
 395
 396         if (nbytes < 1) return(0);
 397
 398         Ctx = CC;
 399
 400 #ifdef BIGBAD_IODBG
 401         {
 402                 int rv = 0;
 403                 char fn [SIZ];
 404                 FILE *fd;
 405
 406                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", Ctx->ServiceName, Ctx->cs_pid);
 407
 408                 fd = fopen(fn, "a+");
 409                 if (fd == NULL) {
 410                         syslog(LOG_EMERG, "failed to open file %s: %s", fn, strerror(errno));
 411                         cit_backtrace();
 412                         exit(1);
 413                 }
 414                 fprintf(fd, "Sending: BufSize: %d BufContent: [",
 415                         nbytes);
 416                 rv = fwrite(buf, nbytes, 1, fd);
 417                 fprintf(fd, "]\n");
 418                 fclose(fd);
 419         }
 420 #endif
 421 //      flush_client_inbuf();
 422         if (Ctx->redirect_buffer != NULL) {
 423                 StrBufAppendBufPlain(Ctx->redirect_buffer,
 424                                      buf, nbytes, 0);
 425                 return 0;
 426         }
 427
 428 #ifdef HAVE_OPENSSL
 429         if (Ctx->redirect_ssl) {
 430                 client_write_ssl(buf, nbytes);
 431                 return 0;
 432         }
 433 #endif
 434         if (Ctx->client_socket == -1) return -1;
 435
 436         fdflags = fcntl(Ctx->client_socket, F_GETFL);
 437
 438         while ((bytes_written < nbytes) && (Ctx->client_socket != -1)){
 439                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 440                         FD_ZERO(&wset);
 441                         FD_SET(Ctx->client_socket, &wset);
 442                         if (select(1, NULL, &wset, NULL, NULL) == -1) {
 443                                 if (errno == EINTR)
 444                                 {
 445                                         syslog(LOG_DEBUG, "client_write(%d bytes) select() interrupted.",
 446                                                 nbytes-bytes_written
 447                                         );
 448                                         if (server_shutting_down) {
 449                                                 CC->kill_me = KILLME_SELECT_INTERRUPTED;
 450                                                 return (-1);
 451                                         } else {
 452                                                 /* can't trust fd's and stuff so we need to re-create them */
 453                                                 continue;
 454                                         }
 455                                 } else {
 456                                         syslog(LOG_ERR,
 457                                                 "client_write(%d bytes) select failed: %s (%d)",
 458                                                 nbytes - bytes_written,
 459                                                 strerror(errno), errno
 460                                         );
 461                                         cit_backtrace();
 462                                         client_close();
 463                                         Ctx->kill_me = KILLME_SELECT_FAILED;
 464                                         return -1;
 465                                 }
 466                         }
 467                 }
 468
 469                 retval = write(Ctx->client_socket, &buf[bytes_written], nbytes - bytes_written);
 470                 if (retval < 1) {
 471                         syslog(LOG_ERR,
 472                                 "client_write(%d bytes) failed: %s (%d)",
 473                                 nbytes - bytes_written,
 474                                 strerror(errno), errno
 475                         );
 476                         cit_backtrace();
 477                         client_close();
 478                         Ctx->kill_me = KILLME_WRITE_FAILED;
 479                         return -1;
 480                 }
 481                 bytes_written = bytes_written + retval;
 482         }
 483         return 0;
 484 }
 485
 486 void cputbuf(const StrBuf *Buf) {
 487         client_write(ChrPtr(Buf), StrLength(Buf));
 488 }
 489
 490
 491 /*
 492  * cprintf()    Send formatted printable data to the client.
 493  *              Implemented in terms of client_write() so it's technically not sysdep...
 494  */
 495 void cprintf(const char *format, ...) {
 496         va_list arg_ptr;
 497         char buf[1024];
 498
 499         va_start(arg_ptr, format);
 500         if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
 501                 buf[sizeof buf - 2] = '\n';
 502         client_write(buf, strlen(buf));
 503         va_end(arg_ptr);
 504 }
 505
 506
 507 /*
 508  * Read data from the client socket.
 509  *
 510  * sock         socket fd to read from
 511  * buf          buffer to read into
 512  * bytes        number of bytes to read
 513  * timeout      Number of seconds to wait before timing out
 514  *
 515  * Possible return values:
 516  *      1       Requested number of bytes has been read.
 517  *      0       Request timed out.
 518  *      -1      Connection is broken, or other error.
 519  */
 520 int client_read_blob(StrBuf *Target, int bytes, int timeout)
 521 {
 522         CitContext *CCC=CC;
 523         const char *Error;
 524         int retval = 0;
 525
 526 #ifdef HAVE_OPENSSL
 527         if (CCC->redirect_ssl) {
 528 #ifdef BIGBAD_IODBG
 529                 int rv = 0;
 530                 char fn [SIZ];
 531                 FILE *fd;
 532
 533                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 534
 535                 fd = fopen(fn, "a+");
 536                 if (fd == NULL) {
 537                         syslog(LOG_EMERG, "failed to open file %s: %s", fn, strerror(errno));
 538                         cit_backtrace();
 539                         exit(1);
 540                 }
 541                 fprintf(fd, "Reading BLOB: BufSize: %d ",
 542                         bytes);
 543                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 544                 fprintf(fd, "]\n");
 545
 546
 547                 fclose(fd);
 548 #endif
 549                 retval = client_read_sslblob(Target, bytes, timeout);
 550                 if (retval < 0) {
 551                         syslog(LOG_CRIT, "client_read_blob() failed");
 552                 }
 553 #ifdef BIGBAD_IODBG
 554                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 555
 556                 fd = fopen(fn, "a+");
 557                 if (fd == NULL) {
 558                         syslog(LOG_EMERG, "failed to open file %s: %s", fn, strerror(errno));
 559                         cit_backtrace();
 560                         exit(1);
 561                 }
 562                 fprintf(fd, "Read: %d BufContent: [",
 563                         StrLength(Target));
 564                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 565                 fprintf(fd, "]\n");
 566
 567
 568                 fclose(fd);
 569 #endif
 570         }
 571         else
 572 #endif
 573         {
 574 #ifdef BIGBAD_IODBG
 575                 int rv = 0;
 576                 char fn [SIZ];
 577                 FILE *fd;
 578
 579                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 580
 581                 fd = fopen(fn, "a+");
 582                 if (fd == NULL) {
 583                         syslog(LOG_EMERG, "failed to open file %s: %s", fn, strerror(errno));
 584                         cit_backtrace();
 585                         exit(1);
 586                 }
 587                 fprintf(fd, "Reading BLOB: BufSize: %d ",
 588                         bytes);
 589                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 590                 fprintf(fd, "]\n");
 591
 592
 593                 fclose(fd);
 594 #endif
 595                 retval = StrBufReadBLOBBuffered(Target,
 596                                                 CCC->RecvBuf.Buf,
 597                                                 &CCC->RecvBuf.ReadWritePointer,
 598                                                 &CCC->client_socket,
 599                                                 1,
 600                                                 bytes,
 601                                                 O_TERM,
 602                                                 &Error);
 603                 if (retval < 0) {
 604                         syslog(LOG_CRIT, "client_read_blob() failed: %s", Error);
 605                         client_close();
 606                         return retval;
 607                 }
 608 #ifdef BIGBAD_IODBG
 609                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 610
 611                 fd = fopen(fn, "a+");
 612                 if (fd == NULL) {
 613                         syslog(LOG_EMERG, "failed to open file %s: %s", fn, strerror(errno));
 614                         cit_backtrace();
 615                         exit(1);
 616                 }
 617                 fprintf(fd, "Read: %d BufContent: [",
 618                         StrLength(Target));
 619                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 620                 fprintf(fd, "]\n");
 621                 fclose(fd);
 622 #endif
 623         }
 624         return retval;
 625 }
 626
 627
 628 /*
 629  * to make client_read_random_blob() more efficient, increase buffer size.
 630  * just use in greeting function, else your buffer may be flushed
 631  */
 632 void client_set_inbound_buf(long N)
 633 {
 634         CitContext *CCC=CC;
 635         FlushStrBuf(CCC->RecvBuf.Buf);
 636         ReAdjustEmptyBuf(CCC->RecvBuf.Buf, N * SIZ, N * SIZ);
 637 }
 638
 639 int client_read_random_blob(StrBuf *Target, int timeout)
 640 {
 641         CitContext *CCC=CC;
 642         int rc;
 643
 644         rc =  client_read_blob(Target, 1, timeout);
 645         if (rc > 0)
 646         {
 647                 long len;
 648                 const char *pch;
 649
 650                 len = StrLength(CCC->RecvBuf.Buf);
 651                 pch = ChrPtr(CCC->RecvBuf.Buf);
 652
 653                 if (len > 0)
 654                 {
 655                         if (CCC->RecvBuf.ReadWritePointer != NULL) {
 656                                 len -= CCC->RecvBuf.ReadWritePointer - pch;
 657                                 pch = CCC->RecvBuf.ReadWritePointer;
 658                         }
 659                         StrBufAppendBufPlain(Target, pch, len, 0);
 660                         FlushStrBuf(CCC->RecvBuf.Buf);
 661                         CCC->RecvBuf.ReadWritePointer = NULL;
 662 #ifdef BIGBAD_IODBG
 663                         {
 664                                 int rv = 0;
 665                                 char fn [SIZ];
 666                                 FILE *fd;
 667
 668                                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 669
 670                                 fd = fopen(fn, "a+");
 671                                 if (fd == NULL) {
 672                                         syslog(LOG_EMERG, "failed to open file %s: %s", fn, strerror(errno));
 673                                         cit_backtrace();
 674                                         exit(1);
 675                                 }
 676                                 fprintf(fd, "Read: BufSize: %d BufContent: [",
 677                                         StrLength(Target));
 678                                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 679                                 fprintf(fd, "]\n");
 680
 681
 682                                 fclose(fd);
 683                         }
 684 #endif
 685
 686                         return StrLength(Target);
 687                 }
 688                 return rc;
 689         }
 690         else
 691                 return rc;
 692 }
 693
 694 int client_read_to(char *buf, int bytes, int timeout)
 695 {
 696         CitContext *CCC=CC;
 697         int rc;
 698
 699         rc = client_read_blob(CCC->MigrateBuf, bytes, timeout);
 700         if (rc < 0)
 701         {
 702                 *buf = '\0';
 703                 return rc;
 704         }
 705         else
 706         {
 707                 memcpy(buf,
 708                        ChrPtr(CCC->MigrateBuf),
 709                        StrLength(CCC->MigrateBuf) + 1);
 710                 FlushStrBuf(CCC->MigrateBuf);
 711                 return rc;
 712         }
 713 }
 714
 715
 716 int HaveMoreLinesWaiting(CitContext *CCC)
 717 {
 718         if ((CCC->kill_me != 0) ||
 719             ( (CCC->RecvBuf.ReadWritePointer == NULL) &&
 720               (StrLength(CCC->RecvBuf.Buf) == 0) &&
 721               (CCC->client_socket != -1)) )
 722                 return 0;
 723         else
 724                 return 1;
 725 }
 726
 727
 728 /*
 729  * Read data from the client socket with default timeout.
 730  * (This is implemented in terms of client_read_to() and could be
 731  * justifiably moved out of sysdep.c)
 732  */
 733 INLINE int client_read(char *buf, int bytes)
 734 {
 735         return(client_read_to(buf, bytes, CtdlGetConfigInt("c_sleeping")));
 736 }
 737
 738 int CtdlClientGetLine(StrBuf *Target)
 739 {
 740         CitContext *CCC=CC;
 741         const char *Error;
 742         int rc;
 743
 744         FlushStrBuf(Target);
 745 #ifdef HAVE_OPENSSL
 746         if (CCC->redirect_ssl) {
 747 #ifdef BIGBAD_IODBG
 748                 char fn [SIZ];
 749                 FILE *fd;
 750                 int len = 0;
 751                 int rlen = 0;
 752                 int  nlen = 0;
 753                 int nrlen = 0;
 754                 const char *pch;
 755
 756                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 757
 758                 fd = fopen(fn, "a+");
 759                 if (fd == NULL) {
 760                         syslog(LOG_EMERG, "failed to open file %s: %s", fn, strerror(errno));
 761                         cit_backtrace();
 762                         exit(1);
 763                 }
 764                 pch = ChrPtr(CCC->RecvBuf.Buf);
 765                 len = StrLength(CCC->RecvBuf.Buf);
 766                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 767                         rlen = CCC->RecvBuf.ReadWritePointer - pch;
 768                 else
 769                         rlen = 0;
 770
 771 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 772                         len, rlen, pch);
 773 */
 774                 fprintf(fd, "\n\n\nSSL1: BufSize: %d BufPos: %d \n_____________________\n",
 775                         len, rlen);
 776 #endif
 777                 rc = client_readline_sslbuffer(Target,
 778                                                CCC->RecvBuf.Buf,
 779                                                &CCC->RecvBuf.ReadWritePointer,
 780                                                1);
 781 #ifdef BIGBAD_IODBG
 782                 pch = ChrPtr(CCC->RecvBuf.Buf);
 783                 nlen = StrLength(CCC->RecvBuf.Buf);
 784                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 785                         nrlen = CCC->RecvBuf.ReadWritePointer - pch;
 786                 else
 787                         nrlen = 0;
 788 /*
 789                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 790                         len, nlen, rlen, nrlen, pch);
 791 */
 792                 fprintf(fd, "\n\n\nSSL2: BufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 793                         len, nlen, rlen, nrlen);
 794
 795                 fprintf(fd, "SSL3: Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 796                         StrLength(Target), ChrPtr(Target));
 797                 fclose(fd);
 798
 799                 if (rc < 0) {
 800                         syslog(LOG_CRIT, "CtdlClientGetLine() failed");
 801                 }
 802 #endif
 803                 return rc;
 804         }
 805         else
 806 #endif
 807         {
 808 #ifdef BIGBAD_IODBG
 809                 char fn [SIZ];
 810                 FILE *fd;
 811                 int len, rlen, nlen, nrlen;
 812                 const char *pch;
 813
 814                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 815
 816                 fd = fopen(fn, "a+");
 817                 if (fd == NULL) {
 818                         syslog(LOG_EMERG, "failed to open file %s: %s", fn, strerror(errno));
 819                         cit_backtrace();
 820                         exit(1);
 821                 }
 822                 pch = ChrPtr(CCC->RecvBuf.Buf);
 823                 len = StrLength(CCC->RecvBuf.Buf);
 824                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 825                         rlen = CCC->RecvBuf.ReadWritePointer - pch;
 826                 else
 827                         rlen = 0;
 828
 829 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 830                         len, rlen, pch);
 831 */
 832                 fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \n_____________________\n",
 833                         len, rlen);
 834 #endif
 835                 rc = StrBufTCP_read_buffered_line_fast(Target,
 836                                                        CCC->RecvBuf.Buf,
 837                                                        &CCC->RecvBuf.ReadWritePointer,
 838                                                        &CCC->client_socket,
 839                                                        5,
 840                                                        1,
 841                                                        &Error);
 842
 843 #ifdef BIGBAD_IODBG
 844                 pch = ChrPtr(CCC->RecvBuf.Buf);
 845                 nlen = StrLength(CCC->RecvBuf.Buf);
 846                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 847                         nrlen = CCC->RecvBuf.ReadWritePointer - pch;
 848                 else
 849                         nrlen = 0;
 850 /*
 851                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 852                         len, nlen, rlen, nrlen, pch);
 853 */
 854                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 855                         len, nlen, rlen, nrlen);
 856
 857                 fprintf(fd, "Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 858                         StrLength(Target), ChrPtr(Target));
 859                 fclose(fd);
 860
 861                 if ((rc < 0) && (Error != NULL)) {
 862                         syslog(LOG_CRIT, "CtdlClientGetLine() failed: %s", Error);
 863                 }
 864 #endif
 865                 return rc;
 866         }
 867 }
 868
 869
 870 /*
 871  * client_getln()   ...   Get a LF-terminated line of text from the client.
 872  * (This is implemented in terms of client_read() and could be
 873  * justifiably moved out of sysdep.c)
 874  */
 875 int client_getln(char *buf, int bufsize)
 876 {
 877         int i, retval;
 878         CitContext *CCC=CC;
 879         const char *pCh;
 880
 881         retval = CtdlClientGetLine(CCC->MigrateBuf);
 882         if (retval < 0)
 883           return(retval >= 0);
 884
 885
 886         i = StrLength(CCC->MigrateBuf);
 887         pCh = ChrPtr(CCC->MigrateBuf);
 888         /* Strip the trailing LF, and the trailing CR if present.
 889          */
 890         if (bufsize <= i)
 891                 i = bufsize - 1;
 892         while ( (i > 0)
 893                 && ( (pCh[i - 1]==13)
 894                      || ( pCh[i - 1]==10)) ) {
 895                 i--;
 896         }
 897         memcpy(buf, pCh, i);
 898         buf[i] = 0;
 899
 900         FlushStrBuf(CCC->MigrateBuf);
 901         if (retval < 0) {
 902                 safestrncpy(&buf[i], "000", bufsize - i);
 903         }
 904         return(retval >= 0);
 905 }
 906
 907
 908 /*
 909  * Cleanup any contexts that are left lying around
 910  */
 911
 912
 913 void close_masters (void)
 914 {
 915         struct ServiceFunctionHook *serviceptr;
 916         const char *Text;
 917
 918         /*
 919          * close all protocol master sockets
 920          */
 921         for (serviceptr = ServiceHookTable; serviceptr != NULL;
 922             serviceptr = serviceptr->next ) {
 923
 924                 if (serviceptr->tcp_port > 0)
 925                 {
 926                         if (serviceptr->msock == -1)
 927                                 Text = "not closing again";
 928                         else
 929                                 Text = "Closing";
 930
 931                         syslog(LOG_INFO, "%s %d listener on port %d\n",
 932                                Text,
 933                                serviceptr->msock,
 934                                serviceptr->tcp_port);
 935                         serviceptr->tcp_port = 0;
 936                 }
 937
 938                 if (serviceptr->sockpath != NULL)
 939                 {
 940                         if (serviceptr->msock == -1)
 941                                 Text = "not closing again";
 942                         else
 943                                 Text = "Closing";
 944
 945                         syslog(LOG_INFO, "%s %d listener on '%s'\n",
 946                                Text,
 947                                serviceptr->msock,
 948                                serviceptr->sockpath);
 949                 }
 950
 951                 if (serviceptr->msock != -1)
 952                 {
 953                         close(serviceptr->msock);
 954                         serviceptr->msock = -1;
 955                 }
 956
 957                 /* If it's a Unix domain socket, remove the file. */
 958                 if (serviceptr->sockpath != NULL) {
 959                         unlink(serviceptr->sockpath);
 960                         serviceptr->sockpath = NULL;
 961                 }
 962         }
 963 }
 964
 965
 966 /*
 967  * The system-dependent part of master_cleanup() - close the master socket.
 968  */
 969 void sysdep_master_cleanup(void) {
 970
 971         close_masters();
 972
 973         context_cleanup();
 974
 975 #ifdef HAVE_OPENSSL
 976         destruct_ssl();
 977 #endif
 978         CtdlDestroyProtoHooks();
 979         CtdlDestroyDeleteHooks();
 980         CtdlDestroyXmsgHooks();
 981         CtdlDestroyNetprocHooks();
 982         CtdlDestroyUserHooks();
 983         CtdlDestroyMessageHook();
 984         CtdlDestroyCleanupHooks();
 985         CtdlDestroyFixedOutputHooks();
 986         CtdlDestroySessionHooks();
 987         CtdlDestroyTDAPVetoHooks();
 988         CtdlDestroyServiceHook();
 989         CtdlDestroyRoomHooks();
 990         CtdlDestroySearchHooks();
 991         CtdlDestroyDebugTable();
 992         #ifdef HAVE_BACKTRACE
 993 ///     eCrash_Uninit();
 994         #endif
 995 }
 996
 997
 998
 999 pid_t current_child;
1000 void graceful_shutdown(int signum) {
1001         kill(current_child, signum);
1002         unlink(file_pid_file);
1003         exit(0);
1004 }
1005
1006 int nFireUps = 0;
1007 int nFireUpsNonRestart = 0;
1008 pid_t ForkedPid = 1;
1009
1010 /*
1011  * Start running as a daemon.
1012  */
1013 void start_daemon(int unused) {
1014         int status = 0;
1015         pid_t child = 0;
1016         FILE *fp;
1017         int do_restart = 0;
1018
1019         current_child = 0;
1020
1021         /* Close stdin/stdout/stderr and replace them with /dev/null.
1022          * We don't just call close() because we don't want these fd's
1023          * to be reused for other files.
1024          */
1025         if (chdir(ctdl_run_dir) != 0)
1026                 syslog(LOG_EMERG,
1027                               "unable to change into directory [%s]: %s",
1028                               ctdl_run_dir, strerror(errno));
1029
1030         child = fork();
1031         if (child != 0) {
1032                 exit(0);
1033         }
1034
1035         signal(SIGHUP, SIG_IGN);
1036         signal(SIGINT, SIG_IGN);
1037         signal(SIGQUIT, SIG_IGN);
1038
1039         setsid();
1040         umask(0);
1041         if ((freopen("/dev/null", "r", stdin) != stdin) ||
1042             (freopen("/dev/null", "w", stdout) != stdout) ||
1043             (freopen("/dev/null", "w", stderr) != stderr))
1044                 syslog(LOG_EMERG,
1045                               "unable to reopen stdin/out/err %s",
1046                               strerror(errno));
1047
1048
1049         do {
1050                 current_child = fork();
1051
1052                 signal(SIGTERM, graceful_shutdown);
1053
1054                 if (current_child < 0) {
1055                         perror("fork");
1056                         exit(errno);
1057                 }
1058
1059                 else if (current_child == 0) {
1060                         return; /* continue starting citadel. */
1061                 }
1062
1063                 else {
1064                         fp = fopen(file_pid_file, "w");
1065                         if (fp != NULL) {
1066                                 fprintf(fp, ""F_PID_T"\n", getpid());
1067                                 fclose(fp);
1068                         }
1069                         waitpid(current_child, &status, 0);
1070                 }
1071
1072                 nFireUpsNonRestart = nFireUps;
1073
1074                 /* Exit code 0 means the watcher should exit */
1075                 if (WIFEXITED(status) && (WEXITSTATUS(status) == CTDLEXIT_SHUTDOWN)) {
1076                         do_restart = 0;
1077                 }
1078
1079                 /* Exit code 101-109 means the watcher should exit */
1080                 else if (WIFEXITED(status) && (WEXITSTATUS(status) >= 101) && (WEXITSTATUS(status) <= 109)) {
1081                         do_restart = 0;
1082                 }
1083
1084                 /* Any other exit code, or no exit code, means we should restart. */
1085                 else {
1086                         do_restart = 1;
1087                         nFireUps++;
1088                         ForkedPid = current_child;
1089                 }
1090
1091         } while (do_restart);
1092
1093         unlink(file_pid_file);
1094         exit(WEXITSTATUS(status));
1095 }
1096
1097
1098
1099 void checkcrash(void)
1100 {
1101         if (nFireUpsNonRestart != nFireUps)
1102         {
1103                 StrBuf *CrashMail;
1104                 const char *msgs[1] = {"crash"};
1105                 const long lens[1] = {sizeof("crash") - 1};
1106                 CrashMail = NewStrBuf();
1107                 syslog(LOG_ALERT, "Posting crash message\n");
1108                 StrBufPrintf(CrashMail,
1109                         " \n"
1110                         " The Citadel server process (citserver) terminated unexpectedly."
1111                         "\n \n"
1112                         " This could be the result of a bug in the server program, or some external "
1113                         "factor.\n \n"
1114                         " You can obtain more information about this by enabling core dumps.\n \n"
1115                         " For more information, please see:\n \n"
1116                         " http://citadel.org/doku.php?id=faq:mastering_your_os:gdb#how.do.i.make.my.system.produce.core-files"
1117                         "\n \n"
1118
1119                         " If you have already done this, the core dump is likely to be found at %score.%d\n"
1120                         ,
1121                         ctdl_run_dir, ForkedPid);
1122                 CtdlAideFPMessage(ChrPtr(CrashMail),
1123                                   "Citadel server process terminated unexpectedly",
1124                                   1, msgs, lens,
1125                                   0, 0,
1126                                   time(NULL));
1127                 FreeStrBuf(&CrashMail);
1128         }
1129 }
1130
1131
1132 /*
1133  * Generic routine to convert a login name to a full name (gecos)
1134  * Returns nonzero if a conversion took place
1135  */
1136 int convert_login(char NameToConvert[]) {
1137         struct passwd *pw;
1138         unsigned int a;
1139
1140         pw = getpwnam(NameToConvert);
1141         if (pw == NULL) {
1142                 return(0);
1143         }
1144         else {
1145                 strcpy(NameToConvert, pw->pw_gecos);
1146                 for (a=0; a<strlen(NameToConvert); ++a) {
1147                         if (NameToConvert[a] == ',') NameToConvert[a] = 0;
1148                 }
1149                 return(1);
1150         }
1151 }
1152
1153
1154
1155 void HuntBadSession(void)
1156 {
1157         int highest;
1158         CitContext *ptr;
1159         fd_set readfds;
1160         struct timeval tv;
1161         struct ServiceFunctionHook *serviceptr;
1162
1163
1164
1165         /* Next, add all of the client sockets. */
1166         begin_critical_section(S_SESSION_TABLE);
1167         for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1168                 if ((ptr->state == CON_SYS) && (ptr->client_socket == 0))
1169                         continue;
1170                 /* Initialize the fdset. */
1171                 FD_ZERO(&readfds);
1172                 highest = 0;
1173                 tv.tv_sec = 0;          /* wake up every second if no input */
1174                 tv.tv_usec = 0;
1175
1176                 /* Don't select on dead sessions, only truly idle ones */
1177                 if (    (ptr->state == CON_IDLE)
1178                         && (ptr->kill_me == 0)
1179                         && (ptr->client_socket > 0)
1180                         ) {
1181                         FD_SET(ptr->client_socket, &readfds);
1182                         if (ptr->client_socket > highest)
1183                                 highest = ptr->client_socket;
1184
1185                         if ((select(highest + 1, &readfds, NULL, NULL, &tv) < 0) &&
1186                             (errno == EBADF))
1187                         {
1188                                 /* Gotcha! */
1189                                 syslog(LOG_EMERG,
1190                                        "Killing Session CC[%d] bad FD: [%d:%d] User[%s] Host[%s:%s]\n",
1191                                        ptr->cs_pid,
1192                                        ptr->client_socket,
1193                                        ptr->is_local_socket,
1194                                        ptr->curr_user,
1195                                        ptr->cs_host,ptr->cs_addr);
1196
1197                                 ptr->kill_me = 1;
1198                                 ptr->client_socket = -1;
1199                                 break;
1200                         }
1201                 }
1202
1203         }
1204         end_critical_section(S_SESSION_TABLE);
1205
1206
1207         /* First, add the various master sockets to the fdset. */
1208         for (serviceptr = ServiceHookTable; serviceptr != NULL; serviceptr = serviceptr->next ) {
1209
1210                 /* Initialize the fdset. */
1211                 highest = 0;
1212                 tv.tv_sec = 0;          /* wake up every second if no input */
1213                 tv.tv_usec = 0;
1214
1215                 FD_SET(serviceptr->msock, &readfds);
1216                 if (serviceptr->msock > highest) {
1217                         highest = serviceptr->msock;
1218                 }
1219                 if ((select(highest + 1, &readfds, NULL, NULL, &tv) < 0) &&
1220                     (errno == EBADF))
1221                 {
1222                         /* Gotcha! server socket dead? commit suicide! */
1223                         syslog(LOG_EMERG,
1224                                "Found bad FD: %d and its a server socket! Shutting Down!\n",
1225                                serviceptr->msock);
1226
1227                         server_shutting_down = 1;
1228                         break;
1229                 }
1230         }
1231
1232
1233 }
1234
1235 const char *WorkerLogStr = "W";
1236 /*
1237  * This loop just keeps going and going and going...
1238  */
1239 void *worker_thread(void *blah) {
1240         int highest;
1241         CitContext *ptr;
1242         CitContext *bind_me = NULL;
1243         fd_set readfds;
1244         int retval = 0;
1245         struct timeval tv;
1246         int force_purge = 0;
1247         struct ServiceFunctionHook *serviceptr;
1248         int ssock;                      /* Descriptor for client socket */
1249         CitContext *con = NULL;         /* Temporary context pointer */
1250         int i;
1251
1252         pthread_mutex_lock(&ThreadCountMutex);
1253         ++num_workers;
1254         pthread_mutex_unlock(&ThreadCountMutex);
1255
1256         pthread_setspecific(evConKey, WorkerLogStr);
1257
1258         while (!server_shutting_down) {
1259
1260                 /* make doubly sure we're not holding any stale db handles
1261                  * which might cause a deadlock.
1262                  */
1263                 cdb_check_handles();
1264 do_select:      force_purge = 0;
1265                 bind_me = NULL;         /* Which session shall we handle? */
1266
1267                 /* Initialize the fdset. */
1268                 FD_ZERO(&readfds);
1269                 highest = 0;
1270
1271                 /* First, add the various master sockets to the fdset. */
1272                 for (serviceptr = ServiceHookTable; serviceptr != NULL; serviceptr = serviceptr->next ) {
1273                         FD_SET(serviceptr->msock, &readfds);
1274                         if (serviceptr->msock > highest) {
1275                                 highest = serviceptr->msock;
1276                         }
1277                 }
1278
1279                 /* Next, add all of the client sockets. */
1280                 begin_critical_section(S_SESSION_TABLE);
1281                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1282                         if ((ptr->state == CON_SYS) && (ptr->client_socket == 0))
1283                             continue;
1284
1285                         /* Don't select on dead sessions, only truly idle ones */
1286                         if (    (ptr->state == CON_IDLE)
1287                                 && (ptr->kill_me == 0)
1288                                 && (ptr->client_socket > 0)
1289                         ) {
1290                                 FD_SET(ptr->client_socket, &readfds);
1291                                 if (ptr->client_socket > highest)
1292                                         highest = ptr->client_socket;
1293                         }
1294                         if ((bind_me == NULL) && (ptr->state == CON_READY)) {
1295                                 bind_me = ptr;
1296                                 ptr->state = CON_EXECUTING;
1297                                 break;
1298                         }
1299                         if ((bind_me == NULL) && (ptr->state == CON_GREETING)) {
1300                                 bind_me = ptr;
1301                                 ptr->state = CON_STARTING;
1302                                 break;
1303                         }
1304                 }
1305                 end_critical_section(S_SESSION_TABLE);
1306
1307                 if (bind_me) {
1308                         goto SKIP_SELECT;
1309                 }
1310
1311                 /* If we got this far, it means that there are no sessions
1312                  * which a previous thread marked for attention, so we go
1313                  * ahead and get ready to select().
1314                  */
1315
1316                 if (!server_shutting_down) {
1317                         tv.tv_sec = 1;          /* wake up every second if no input */
1318                         tv.tv_usec = 0;
1319                         retval = select(highest + 1, &readfds, NULL, NULL, &tv);
1320                 }
1321                 else {
1322                         --num_workers;
1323                         return NULL;
1324                 }
1325
1326                 /* Now figure out who made this select() unblock.
1327                  * First, check for an error or exit condition.
1328                  */
1329                 if (retval < 0) {
1330                         if (errno == EBADF) {
1331                                 syslog(LOG_EMERG, "select() failed: (%s)\n", strerror(errno));
1332                                 HuntBadSession ();
1333                                 goto do_select;
1334                         }
1335                         if (errno != EINTR) {
1336                                 syslog(LOG_EMERG, "Exiting (%s)\n", strerror(errno));
1337                                 server_shutting_down = 1;
1338                                 continue;
1339                         } else {
1340 #if 0
1341                                 syslog(LOG_DEBUG, "Interrupted select()\n");
1342 #endif
1343                                 if (server_shutting_down) {
1344                                         --num_workers;
1345                                         return(NULL);
1346                                 }
1347                                 goto do_select;
1348                         }
1349                 }
1350                 else if (retval == 0) {
1351                         if (server_shutting_down) {
1352                                 --num_workers;
1353                                 return(NULL);
1354                         }
1355                 }
1356
1357                 /* Next, check to see if it's a new client connecting * on a master socket. */
1358
1359                 else if ((retval > 0) && (!server_shutting_down)) for (serviceptr = ServiceHookTable; serviceptr != NULL; serviceptr = serviceptr->next) {
1360
1361                         if (FD_ISSET(serviceptr->msock, &readfds)) {
1362                                 ssock = accept(serviceptr->msock, NULL, 0);
1363                                 if (ssock >= 0) {
1364                                         syslog(LOG_DEBUG, "New client socket %d", ssock);
1365
1366                                         /* The master socket is non-blocking but the client
1367                                          * sockets need to be blocking, otherwise certain
1368                                          * operations barf on FreeBSD.  Not a fatal error.
1369                                          */
1370                                         if (fcntl(ssock, F_SETFL, 0) < 0) {
1371                                                 syslog(LOG_EMERG,
1372                                                         "citserver: Can't set socket to blocking: %s\n",
1373                                                         strerror(errno));
1374                                         }
1375
1376                                         /* New context will be created already
1377                                          * set up in the CON_EXECUTING state.
1378                                          */
1379                                         con = CreateNewContext();
1380
1381                                         /* Assign our new socket number to it. */
1382                                         con->tcp_port = serviceptr->tcp_port;
1383                                         con->client_socket = ssock;
1384                                         con->h_command_function = serviceptr->h_command_function;
1385                                         con->h_async_function = serviceptr->h_async_function;
1386                                         con->h_greeting_function = serviceptr->h_greeting_function;
1387                                         con->ServiceName = serviceptr->ServiceName;
1388
1389                                         /* Determine whether it's a local socket */
1390                                         if (serviceptr->sockpath != NULL) {
1391                                                 con->is_local_socket = 1;
1392                                         }
1393
1394                                         /* Set the SO_REUSEADDR socket option */
1395                                         i = 1;
1396                                         setsockopt(ssock, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
1397                                         con->state = CON_GREETING;
1398                                         retval--;
1399                                         if (retval == 0)
1400                                                 break;
1401                                 }
1402                         }
1403                 }
1404
1405                 /* It must be a client socket.  Find a context that has data
1406                  * waiting on its socket *and* is in the CON_IDLE state.  Any
1407                  * active sockets other than our chosen one are marked as
1408                  * CON_READY so the next thread that comes around can just bind
1409                  * to one without having to select() again.
1410                  */
1411                 begin_critical_section(S_SESSION_TABLE);
1412                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1413                         int checkfd = ptr->client_socket;
1414                         if ((checkfd != -1) && (ptr->state == CON_IDLE) ){
1415                                 if (FD_ISSET(checkfd, &readfds)) {
1416                                         ptr->input_waiting = 1;
1417                                         if (!bind_me) {
1418                                                 bind_me = ptr;  /* I choose you! */
1419                                                 bind_me->state = CON_EXECUTING;
1420                                         }
1421                                         else {
1422                                                 ptr->state = CON_READY;
1423                                         }
1424                                 } else if ((ptr->is_async) && (ptr->async_waiting) && (ptr->h_async_function)) {
1425                                         if (!bind_me) {
1426                                                 bind_me = ptr;  /* I choose you! */
1427                                                 bind_me->state = CON_EXECUTING;
1428                                         }
1429                                         else {
1430                                                 ptr->state = CON_READY;
1431                                         }
1432                                 }
1433                         }
1434                 }
1435                 end_critical_section(S_SESSION_TABLE);
1436
1437 SKIP_SELECT:
1438                 /* We're bound to a session */
1439                 pthread_mutex_lock(&ThreadCountMutex);
1440                 ++active_workers;
1441                 pthread_mutex_unlock(&ThreadCountMutex);
1442
1443                 if (bind_me != NULL) {
1444                         become_session(bind_me);
1445
1446                         if (bind_me->state == CON_STARTING) {
1447                                 bind_me->state = CON_EXECUTING;
1448                                 begin_session(bind_me);
1449                                 bind_me->h_greeting_function();
1450                         }
1451                         /* If the client has sent a command, execute it. */
1452                         if (CC->input_waiting) {
1453                                 CC->h_command_function();
1454
1455                                 while (HaveMoreLinesWaiting(CC))
1456                                        CC->h_command_function();
1457
1458                                 CC->input_waiting = 0;
1459                         }
1460
1461                         /* If there are asynchronous messages waiting and the
1462                          * client supports it, do those now */
1463                         if ((CC->is_async) && (CC->async_waiting)
1464                            && (CC->h_async_function != NULL)) {
1465                                 CC->h_async_function();
1466                                 CC->async_waiting = 0;
1467                         }
1468
1469                         force_purge = CC->kill_me;
1470                         become_session(NULL);
1471                         bind_me->state = CON_IDLE;
1472                 }
1473
1474                 dead_session_purge(force_purge);
1475                 do_housekeeping();
1476
1477                 pthread_mutex_lock(&ThreadCountMutex);
1478                 --active_workers;
1479                 if ((active_workers + CtdlGetConfigInt("c_min_workers") < num_workers) &&
1480                     (num_workers > CtdlGetConfigInt("c_min_workers")))
1481                 {
1482                         num_workers--;
1483                         pthread_mutex_unlock(&ThreadCountMutex);
1484                         return (NULL);
1485                 }
1486                 pthread_mutex_unlock(&ThreadCountMutex);
1487         }
1488
1489         /* If control reaches this point, the server is shutting down */
1490         pthread_mutex_lock(&ThreadCountMutex);
1491         --num_workers;
1492         pthread_mutex_unlock(&ThreadCountMutex);
1493         return(NULL);
1494 }
1495
1496
1497
1498 /*
1499  * SyslogFacility()
1500  * Translate text facility name to syslog.h defined value.
1501  */
1502 int SyslogFacility(char *name)
1503 {
1504         int i;
1505         struct
1506         {
1507                 int facility;
1508                 char *name;
1509         }   facTbl[] =
1510         {
1511                 {   LOG_KERN,   "kern"          },
1512                 {   LOG_USER,   "user"          },
1513                 {   LOG_MAIL,   "mail"          },
1514                 {   LOG_DAEMON, "daemon"        },
1515                 {   LOG_AUTH,   "auth"          },
1516                 {   LOG_SYSLOG, "syslog"        },
1517                 {   LOG_LPR,    "lpr"           },
1518                 {   LOG_NEWS,   "news"          },
1519                 {   LOG_UUCP,   "uucp"          },
1520                 {   LOG_LOCAL0, "local0"        },
1521                 {   LOG_LOCAL1, "local1"        },
1522                 {   LOG_LOCAL2, "local2"        },
1523                 {   LOG_LOCAL3, "local3"        },
1524                 {   LOG_LOCAL4, "local4"        },
1525                 {   LOG_LOCAL5, "local5"        },
1526                 {   LOG_LOCAL6, "local6"        },
1527                 {   LOG_LOCAL7, "local7"        },
1528                 {   0,            NULL          }
1529         };
1530         for(i = 0; facTbl[i].name != NULL; i++) {
1531                 if(!strcasecmp(name, facTbl[i].name))
1532                         return facTbl[i].facility;
1533         }
1534         return LOG_DAEMON;
1535 }