citadel/sysdep.c

   1 /*
   2  * Citadel "system dependent" stuff.
   3  *
   4  * Here's where we (hopefully) have most parts of the Citadel server that
   5  * might need tweaking when run on different operating system variants.
   6  *
   7  * Copyright (c) 1987-2017 by the citadel.org team
   8  *
   9  * This program is open source software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License, version 3.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include "sysdep.h"
  19 #include <stdlib.h>
  20 #include <unistd.h>
  21 #include <sys/stat.h>
  22 #include <errno.h>
  23 #include <signal.h>
  24 #include <stdio.h>
  25 #include <syslog.h>
  26 #include <sys/syslog.h>
  27 #include <netdb.h>
  28 #include <sys/un.h>
  29 #include <sys/types.h>
  30 #include <sys/socket.h>
  31 #include <netinet/in.h>
  32 #include <arpa/inet.h>
  33 #include <netinet/tcp.h>
  34 #include <arpa/inet.h>
  35 #define SHOW_ME_VAPPEND_PRINTF
  36 #include <libcitadel.h>
  37 #include "citserver.h"
  38 #include "config.h"
  39 #include "ctdl_module.h"
  40 #include "sysdep_decls.h"
  41 #include "modules/crypto/serv_crypto.h" /* Needed for init_ssl, client_write_ssl, client_read_ssl, destruct_ssl */
  42 #include "housekeeping.h"
  43 #include "context.h"
  44 /*
  45  * Signal handler to shut down the server.
  46  */
  47
  48 volatile int exit_signal = 0;
  49 volatile int shutdown_and_halt = 0;
  50 volatile int restart_server = 0;
  51 volatile int running_as_daemon = 0;
  52
  53 static RETSIGTYPE signal_cleanup(int signum) {
  54         syslog(LOG_DEBUG, "sysdep: caught signal %d; shutting down.", signum);
  55         exit_signal = signum;
  56         server_shutting_down = 1;
  57 }
  58
  59 static RETSIGTYPE signal_exit(int signum) {
  60         exit(1);
  61 }
  62
  63
  64
  65 /*
  66  * Some initialization stuff...
  67  */
  68 void init_sysdep(void) {
  69         sigset_t set;
  70
  71         /* Avoid vulnerabilities related to FD_SETSIZE if we can. */
  72 #ifdef FD_SETSIZE
  73 #ifdef RLIMIT_NOFILE
  74         struct rlimit rl;
  75         getrlimit(RLIMIT_NOFILE, &rl);
  76         rl.rlim_cur = FD_SETSIZE;
  77         rl.rlim_max = FD_SETSIZE;
  78         setrlimit(RLIMIT_NOFILE, &rl);
  79 #endif
  80 #endif
  81
  82         /* If we've got OpenSSL, we're going to use it. */
  83 #ifdef HAVE_OPENSSL
  84         init_ssl();
  85 #endif
  86
  87         /*
  88          * Set up a place to put thread-specific data.
  89          * We only need a single pointer per thread - it points to the
  90          * CitContext structure (in the ContextList linked list) of the
  91          * session to which the calling thread is currently bound.
  92          */
  93         if (pthread_key_create(&MyConKey, NULL) != 0) {
  94                 syslog(LOG_CRIT, "sysdep: can't create TSD key: %s", strerror(errno));
  95         }
  96
  97         /*
  98          * Interript, hangup, and terminate signals should cause the server
  99          * to gracefully clean up and shut down.
 100          */
 101         sigemptyset(&set);
 102         sigaddset(&set, SIGINT);
 103         sigaddset(&set, SIGHUP);
 104         sigaddset(&set, SIGTERM);
 105         sigprocmask(SIG_UNBLOCK, &set, NULL);
 106
 107         signal(SIGINT, signal_cleanup);
 108         signal(SIGHUP, signal_cleanup);
 109         signal(SIGTERM, signal_cleanup);
 110         signal(SIGUSR2, signal_exit);
 111
 112         /*
 113          * Do not shut down the server on broken pipe signals, otherwise the
 114          * whole Citadel service would come down whenever a single client
 115          * socket breaks.
 116          */
 117         signal(SIGPIPE, SIG_IGN);
 118 }
 119
 120
 121 /*
 122  * This is a generic function to set up a master socket for listening on
 123  * a TCP port.  The server shuts down if the bind fails.  (IPv4/IPv6 version)
 124  *
 125  * ip_addr      IP address to bind
 126  * port_number  port number to bind
 127  * queue_len    number of incoming connections to allow in the queue
 128  */
 129 int ctdl_tcp_server(char *ip_addr, int port_number, int queue_len, char *errormessage)
 130 {
 131         struct protoent *p;
 132         struct sockaddr_in6 sin6;
 133         struct sockaddr_in sin4;
 134         int s, i, b;
 135         int ip_version = 6;
 136
 137         memset(&sin6, 0, sizeof(sin6));
 138         memset(&sin4, 0, sizeof(sin4));
 139         sin6.sin6_family = AF_INET6;
 140         sin4.sin_family = AF_INET;
 141
 142         if (    (ip_addr == NULL)                                                       /* any IPv6 */
 143                 || (IsEmptyStr(ip_addr))
 144                 || (!strcmp(ip_addr, "*"))
 145         ) {
 146                 ip_version = 6;
 147                 sin6.sin6_addr = in6addr_any;
 148         }
 149         else if (!strcmp(ip_addr, "0.0.0.0"))                                           /* any IPv4 */
 150         {
 151                 ip_version = 4;
 152                 sin4.sin_addr.s_addr = INADDR_ANY;
 153         }
 154         else if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':')))                     /* specific IPv4 */
 155         {
 156                 ip_version = 4;
 157                 if (inet_pton(AF_INET, ip_addr, &sin4.sin_addr) <= 0) {
 158                         snprintf(errormessage, SIZ, "Error binding to [%s] : %s", ip_addr, strerror(errno));
 159                         syslog(LOG_ALERT, "tcpserver: %s", errormessage);
 160                         return (-1);
 161                 }
 162         }
 163         else                                                                            /* specific IPv6 */
 164         {
 165                 ip_version = 6;
 166                 if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
 167                         snprintf(errormessage, SIZ,
 168                                  "Error binding to [%s] : %s", ip_addr, strerror(errno)
 169                         );
 170                         syslog(LOG_ALERT, "tcpserver: %s", errormessage);
 171                         return (-1);
 172                 }
 173         }
 174
 175         if (port_number == 0) {
 176                 snprintf(errormessage, SIZ, "Can't start: no port number specified.");
 177                 syslog(LOG_ALERT, "tcpserver: %s", errormessage);
 178                 return (-1);
 179         }
 180         sin6.sin6_port = htons((u_short) port_number);
 181         sin4.sin_port = htons((u_short) port_number);
 182
 183         p = getprotobyname("tcp");
 184
 185         s = socket( ((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
 186         if (s < 0) {
 187                 snprintf(errormessage, SIZ, "Can't create a listening socket: %s", strerror(errno));
 188                 syslog(LOG_ALERT, "tcpserver: %s", errormessage);
 189                 return (-1);
 190         }
 191         /* Set some socket options that make sense. */
 192         i = 1;
 193         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 194
 195         if (ip_version == 6) {
 196                 b = bind(s, (struct sockaddr *) &sin6, sizeof(sin6));
 197         }
 198         else {
 199                 b = bind(s, (struct sockaddr *) &sin4, sizeof(sin4));
 200         }
 201
 202         if (b < 0) {
 203                 snprintf(errormessage, SIZ, "Can't bind: %s", strerror(errno));
 204                 syslog(LOG_ALERT, "tcpserver: %s", errormessage);
 205                 return (-1);
 206         }
 207
 208         fcntl(s, F_SETFL, O_NONBLOCK);
 209
 210         if (listen(s, ((queue_len >= 5) ? queue_len : 5) ) < 0) {
 211                 snprintf(errormessage, SIZ, "Can't listen: %s", strerror(errno));
 212                 syslog(LOG_ALERT, "tcpserver: %s", errormessage);
 213                 return (-1);
 214         }
 215         return (s);
 216 }
 217
 218
 219 /*
 220  * Create a Unix domain socket and listen on it
 221  */
 222 int ctdl_uds_server(char *sockpath, int queue_len, char *errormessage)
 223 {
 224         struct sockaddr_un addr;
 225         int s;
 226         int i;
 227         int actual_queue_len;
 228 #ifdef HAVE_STRUCT_UCRED
 229         int passcred = 1;
 230 #endif
 231
 232         actual_queue_len = queue_len;
 233         if (actual_queue_len < 5) actual_queue_len = 5;
 234
 235         i = unlink(sockpath);
 236         if ((i != 0) && (errno != ENOENT)) {
 237                 snprintf(errormessage, SIZ, "can't unlink %s: %s", sockpath, strerror(errno));
 238                 syslog(LOG_EMERG, "udsserver: %s", errormessage);
 239                 return(-1);
 240         }
 241
 242         memset(&addr, 0, sizeof(addr));
 243         addr.sun_family = AF_UNIX;
 244         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 245
 246         s = socket(AF_UNIX, SOCK_STREAM, 0);
 247         if (s < 0) {
 248                 snprintf(errormessage, SIZ, "can't create a socket: %s", strerror(errno));
 249                 syslog(LOG_EMERG, "udsserver: %s", errormessage);
 250                 return(-1);
 251         }
 252
 253         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 254                 snprintf(errormessage, SIZ, "can't bind: %s", strerror(errno));
 255                 syslog(LOG_EMERG, "udsserver: %s", errormessage);
 256                 return(-1);
 257         }
 258
 259         /* set to nonblock - we need this for some obscure situations */
 260         if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
 261                 snprintf(errormessage, SIZ, "can't set socket to non-blocking: %s", strerror(errno));
 262                 syslog(LOG_EMERG, "udsserver: %s", errormessage);
 263                 close(s);
 264                 return(-1);
 265         }
 266
 267         if (listen(s, actual_queue_len) < 0) {
 268                 snprintf(errormessage, SIZ, "can't listen: %s", strerror(errno));
 269                 syslog(LOG_EMERG, "udsserver: %s", errormessage);
 270                 return(-1);
 271         }
 272
 273 #ifdef HAVE_STRUCT_UCRED
 274         setsockopt(s, SOL_SOCKET, SO_PASSCRED, &passcred, sizeof(passcred));
 275 #endif
 276
 277         chmod(sockpath, S_ISGID|S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
 278         return(s);
 279 }
 280
 281
 282 /*
 283  * The following functions implement output buffering on operating systems which
 284  * support it (such as Linux and various BSD flavors).
 285  */
 286 #ifndef HAVE_DARWIN
 287 #ifdef TCP_CORK
 288 #       define HAVE_TCP_BUFFERING
 289 #else
 290 #       ifdef TCP_NOPUSH
 291 #               define HAVE_TCP_BUFFERING
 292 #               define TCP_CORK TCP_NOPUSH
 293 #       endif
 294 #endif /* TCP_CORK */
 295 #endif /* HAVE_DARWIN */
 296
 297 static unsigned on = 1, off = 0;
 298
 299 void buffer_output(void) {
 300 #ifdef HAVE_TCP_BUFFERING
 301 #ifdef HAVE_OPENSSL
 302         if (!CC->redirect_ssl)
 303 #endif
 304                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 305 #endif
 306 }
 307
 308 void unbuffer_output(void) {
 309 #ifdef HAVE_TCP_BUFFERING
 310 #ifdef HAVE_OPENSSL
 311         if (!CC->redirect_ssl)
 312 #endif
 313                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 314 #endif
 315 }
 316
 317 void flush_output(void) {
 318 #ifdef HAVE_TCP_BUFFERING
 319         struct CitContext *CCC = CC;
 320         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 321         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 322 #endif
 323 }
 324
 325 /*
 326 static void flush_client_inbuf(void)
 327 {
 328         CitContext *CCC=CC;
 329
 330         FlushStrBuf(CCC->ReadBuf);
 331         CCC->RecvBuf->ReadWritePointer = NULL;
 332
 333 }
 334 */
 335
 336
 337 /*
 338  * client_close()       ...     close the client socket
 339  */
 340 void client_close(void) {
 341         CitContext *CCC = CC;
 342
 343         if (!CCC) return;
 344         if (CCC->client_socket <= 0) return;
 345         syslog(LOG_DEBUG, "sysdep: closing socket %d", CCC->client_socket);
 346         close(CCC->client_socket);
 347         CCC->client_socket = -1 ;
 348 }
 349
 350
 351 /*
 352  * client_write()   ...    Send binary data to the client.
 353  */
 354 int client_write(const char *buf, int nbytes)
 355 {
 356         int bytes_written = 0;
 357         int retval;
 358 #ifndef HAVE_TCP_BUFFERING
 359         int old_buffer_len = 0;
 360 #endif
 361         fd_set wset;
 362         CitContext *Ctx;
 363         int fdflags;
 364
 365         if (nbytes < 1) return(0);
 366
 367         Ctx = CC;
 368
 369 #ifdef BIGBAD_IODBG
 370         {
 371                 int rv = 0;
 372                 char fn [SIZ];
 373                 FILE *fd;
 374
 375                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", Ctx->ServiceName, Ctx->cs_pid);
 376
 377                 fd = fopen(fn, "a+");
 378                 if (fd == NULL) {
 379                         syslog(LOG_ERR, "%s: %s", fn, strerror(errno));
 380                         cit_backtrace();
 381                         exit(1);
 382                 }
 383                 fprintf(fd, "Sending: BufSize: %d BufContent: [", nbytes);
 384                 rv = fwrite(buf, nbytes, 1, fd);
 385                 fprintf(fd, "]\n");
 386                 fclose(fd);
 387         }
 388 #endif
 389 //      flush_client_inbuf();
 390         if (Ctx->redirect_buffer != NULL) {
 391                 StrBufAppendBufPlain(Ctx->redirect_buffer,
 392                                      buf, nbytes, 0);
 393                 return 0;
 394         }
 395
 396 #ifdef HAVE_OPENSSL
 397         if (Ctx->redirect_ssl) {
 398                 client_write_ssl(buf, nbytes);
 399                 return 0;
 400         }
 401 #endif
 402         if (Ctx->client_socket == -1) return -1;
 403
 404         fdflags = fcntl(Ctx->client_socket, F_GETFL);
 405
 406         while ((bytes_written < nbytes) && (Ctx->client_socket != -1)){
 407                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 408                         FD_ZERO(&wset);
 409                         FD_SET(Ctx->client_socket, &wset);
 410                         if (select(1, NULL, &wset, NULL, NULL) == -1) {
 411                                 if (errno == EINTR)
 412                                 {
 413                                         syslog(LOG_DEBUG, "sysdep: client_write(%d bytes) select() interrupted.", nbytes-bytes_written);
 414                                         if (server_shutting_down) {
 415                                                 CC->kill_me = KILLME_SELECT_INTERRUPTED;
 416                                                 return (-1);
 417                                         } else {
 418                                                 /* can't trust fd's and stuff so we need to re-create them */
 419                                                 continue;
 420                                         }
 421                                 } else {
 422                                         syslog(LOG_ERR,
 423                                                 "sysdep: client_write(%d bytes) select failed: %s (%d)",
 424                                                 nbytes - bytes_written,
 425                                                 strerror(errno), errno
 426                                         );
 427                                         cit_backtrace();
 428                                         client_close();
 429                                         Ctx->kill_me = KILLME_SELECT_FAILED;
 430                                         return -1;
 431                                 }
 432                         }
 433                 }
 434
 435                 retval = write(Ctx->client_socket, &buf[bytes_written], nbytes - bytes_written);
 436                 if (retval < 1) {
 437                         syslog(LOG_ERR,
 438                                 "sysdep: client_write(%d bytes) failed: %s (%d)",
 439                                 nbytes - bytes_written,
 440                                 strerror(errno), errno
 441                         );
 442                         cit_backtrace();
 443                         client_close();
 444                         Ctx->kill_me = KILLME_WRITE_FAILED;
 445                         return -1;
 446                 }
 447                 bytes_written = bytes_written + retval;
 448         }
 449         return 0;
 450 }
 451
 452 void cputbuf(const StrBuf *Buf) {
 453         client_write(ChrPtr(Buf), StrLength(Buf));
 454 }
 455
 456
 457 /*
 458  * cprintf()    Send formatted printable data to the client.
 459  *              Implemented in terms of client_write() so it's technically not sysdep...
 460  */
 461 void cprintf(const char *format, ...) {
 462         va_list arg_ptr;
 463         char buf[1024];
 464
 465         va_start(arg_ptr, format);
 466         if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
 467                 buf[sizeof buf - 2] = '\n';
 468         client_write(buf, strlen(buf));
 469         va_end(arg_ptr);
 470 }
 471
 472
 473 /*
 474  * Read data from the client socket.
 475  *
 476  * sock         socket fd to read from
 477  * buf          buffer to read into
 478  * bytes        number of bytes to read
 479  * timeout      Number of seconds to wait before timing out
 480  *
 481  * Possible return values:
 482  *      1       Requested number of bytes has been read.
 483  *      0       Request timed out.
 484  *      -1      Connection is broken, or other error.
 485  */
 486 int client_read_blob(StrBuf *Target, int bytes, int timeout)
 487 {
 488         CitContext *CCC=CC;
 489         const char *Error;
 490         int retval = 0;
 491
 492 #ifdef HAVE_OPENSSL
 493         if (CCC->redirect_ssl) {
 494 #ifdef BIGBAD_IODBG
 495                 int rv = 0;
 496                 char fn [SIZ];
 497                 FILE *fd;
 498
 499                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 500
 501                 fd = fopen(fn, "a+");
 502                 if (fd == NULL) {
 503                         syslog(LOG_ERR, "%s: %s", fn, strerror(errno));
 504                         cit_backtrace();
 505                         exit(1);
 506                 }
 507                 fprintf(fd, "Reading BLOB: BufSize: %d ", bytes);
 508                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 509                 fprintf(fd, "]\n");
 510
 511
 512                 fclose(fd);
 513 #endif
 514                 retval = client_read_sslblob(Target, bytes, timeout);
 515                 if (retval < 0) {
 516                         syslog(LOG_ERR, "sysdep: client_read_blob() failed");
 517                 }
 518 #ifdef BIGBAD_IODBG
 519                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 520
 521                 fd = fopen(fn, "a+");
 522                 if (fd == NULL) {
 523                         syslog(LOG_ERR, "%s: %s", fn, strerror(errno));
 524                         cit_backtrace();
 525                         exit(1);
 526                 }
 527                 fprintf(fd, "Read: %d BufContent: [", StrLength(Target));
 528                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 529                 fprintf(fd, "]\n");
 530                 fclose(fd);
 531 #endif
 532         }
 533         else
 534 #endif
 535         {
 536 #ifdef BIGBAD_IODBG
 537                 int rv = 0;
 538                 char fn [SIZ];
 539                 FILE *fd;
 540
 541                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 542
 543                 fd = fopen(fn, "a+");
 544                 if (fd == NULL) {
 545                         syslog(LOG_ERR, "%s: %s", fn, strerror(errno));
 546                         cit_backtrace();
 547                         exit(1);
 548                 }
 549                 fprintf(fd, "Reading BLOB: BufSize: %d ",
 550                         bytes);
 551                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 552                 fprintf(fd, "]\n");
 553                 fclose(fd);
 554 #endif
 555                 retval = StrBufReadBLOBBuffered(Target,
 556                                                 CCC->RecvBuf.Buf,
 557                                                 &CCC->RecvBuf.ReadWritePointer,
 558                                                 &CCC->client_socket,
 559                                                 1,
 560                                                 bytes,
 561                                                 O_TERM,
 562                                                 &Error
 563                 );
 564                 if (retval < 0) {
 565                         syslog(LOG_ERR, "sysdep: client_read_blob() failed: %s", Error);
 566                         client_close();
 567                         return retval;
 568                 }
 569 #ifdef BIGBAD_IODBG
 570                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 571
 572                 fd = fopen(fn, "a+");
 573                 if (fd == NULL) {
 574                         syslog(LOG_ERR, "%s: %s", fn, strerror(errno));
 575                         cit_backtrace();
 576                         exit(1);
 577                 }
 578                 fprintf(fd, "Read: %d BufContent: [",
 579                         StrLength(Target));
 580                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 581                 fprintf(fd, "]\n");
 582                 fclose(fd);
 583 #endif
 584         }
 585         return retval;
 586 }
 587
 588
 589 /*
 590  * to make client_read_random_blob() more efficient, increase buffer size.
 591  * just use in greeting function, else your buffer may be flushed
 592  */
 593 void client_set_inbound_buf(long N)
 594 {
 595         CitContext *CCC=CC;
 596         FlushStrBuf(CCC->RecvBuf.Buf);
 597         ReAdjustEmptyBuf(CCC->RecvBuf.Buf, N * SIZ, N * SIZ);
 598 }
 599
 600 int client_read_random_blob(StrBuf *Target, int timeout)
 601 {
 602         CitContext *CCC=CC;
 603         int rc;
 604
 605         rc =  client_read_blob(Target, 1, timeout);
 606         if (rc > 0)
 607         {
 608                 long len;
 609                 const char *pch;
 610
 611                 len = StrLength(CCC->RecvBuf.Buf);
 612                 pch = ChrPtr(CCC->RecvBuf.Buf);
 613
 614                 if (len > 0)
 615                 {
 616                         if (CCC->RecvBuf.ReadWritePointer != NULL) {
 617                                 len -= CCC->RecvBuf.ReadWritePointer - pch;
 618                                 pch = CCC->RecvBuf.ReadWritePointer;
 619                         }
 620                         StrBufAppendBufPlain(Target, pch, len, 0);
 621                         FlushStrBuf(CCC->RecvBuf.Buf);
 622                         CCC->RecvBuf.ReadWritePointer = NULL;
 623 #ifdef BIGBAD_IODBG
 624                         {
 625                                 int rv = 0;
 626                                 char fn [SIZ];
 627                                 FILE *fd;
 628
 629                                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 630
 631                                 fd = fopen(fn, "a+");
 632                                 if (fd == NULL) {
 633                                         syslog(LOG_ERR, "%s: %s", fn, strerror(errno));
 634                                         cit_backtrace();
 635                                         exit(1);
 636                                 }
 637                                 fprintf(fd, "Read: BufSize: %d BufContent: [",
 638                                         StrLength(Target));
 639                                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 640                                 fprintf(fd, "]\n");
 641                                 fclose(fd);
 642                         }
 643 #endif
 644                         return StrLength(Target);
 645                 }
 646                 return rc;
 647         }
 648         else
 649                 return rc;
 650 }
 651
 652 int client_read_to(char *buf, int bytes, int timeout)
 653 {
 654         CitContext *CCC=CC;
 655         int rc;
 656
 657         rc = client_read_blob(CCC->MigrateBuf, bytes, timeout);
 658         if (rc < 0)
 659         {
 660                 *buf = '\0';
 661                 return rc;
 662         }
 663         else
 664         {
 665                 memcpy(buf,
 666                        ChrPtr(CCC->MigrateBuf),
 667                        StrLength(CCC->MigrateBuf) + 1);
 668                 FlushStrBuf(CCC->MigrateBuf);
 669                 return rc;
 670         }
 671 }
 672
 673
 674 int HaveMoreLinesWaiting(CitContext *CCC)
 675 {
 676         if ((CCC->kill_me != 0) ||
 677             ( (CCC->RecvBuf.ReadWritePointer == NULL) &&
 678               (StrLength(CCC->RecvBuf.Buf) == 0) &&
 679               (CCC->client_socket != -1)) )
 680                 return 0;
 681         else
 682                 return 1;
 683 }
 684
 685
 686 /*
 687  * Read data from the client socket with default timeout.
 688  * (This is implemented in terms of client_read_to() and could be
 689  * justifiably moved out of sysdep.c)
 690  */
 691 INLINE int client_read(char *buf, int bytes)
 692 {
 693         return(client_read_to(buf, bytes, CtdlGetConfigInt("c_sleeping")));
 694 }
 695
 696 int CtdlClientGetLine(StrBuf *Target)
 697 {
 698         CitContext *CCC=CC;
 699         const char *Error;
 700         int rc;
 701
 702         FlushStrBuf(Target);
 703 #ifdef HAVE_OPENSSL
 704         if (CCC->redirect_ssl) {
 705 #ifdef BIGBAD_IODBG
 706                 char fn [SIZ];
 707                 FILE *fd;
 708                 int len = 0;
 709                 int rlen = 0;
 710                 int  nlen = 0;
 711                 int nrlen = 0;
 712                 const char *pch;
 713
 714                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 715
 716                 fd = fopen(fn, "a+");
 717                 if (fd == NULL) {
 718                         syslog(LOG_ERR, "%s: %s", fn, strerror(errno));
 719                         cit_backtrace();
 720                         exit(1);
 721                 }
 722                 pch = ChrPtr(CCC->RecvBuf.Buf);
 723                 len = StrLength(CCC->RecvBuf.Buf);
 724                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 725                         rlen = CCC->RecvBuf.ReadWritePointer - pch;
 726                 else
 727                         rlen = 0;
 728
 729 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 730                         len, rlen, pch);
 731 */
 732                 fprintf(fd, "\n\n\nSSL1: BufSize: %d BufPos: %d \n_____________________\n",
 733                         len, rlen);
 734 #endif
 735                 rc = client_readline_sslbuffer(Target,
 736                                                CCC->RecvBuf.Buf,
 737                                                &CCC->RecvBuf.ReadWritePointer,
 738                                                1);
 739 #ifdef BIGBAD_IODBG
 740                 pch = ChrPtr(CCC->RecvBuf.Buf);
 741                 nlen = StrLength(CCC->RecvBuf.Buf);
 742                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 743                         nrlen = CCC->RecvBuf.ReadWritePointer - pch;
 744                 else
 745                         nrlen = 0;
 746 /*
 747                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 748                         len, nlen, rlen, nrlen, pch);
 749 */
 750                 fprintf(fd, "\n\n\nSSL2: BufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 751                         len, nlen, rlen, nrlen);
 752
 753                 fprintf(fd, "SSL3: Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 754                         StrLength(Target), ChrPtr(Target));
 755                 fclose(fd);
 756
 757                 if (rc < 0) {
 758                         syslog(LOG_ERR, "sysdep: CtdlClientGetLine() failed");
 759                 }
 760 #endif
 761                 return rc;
 762         }
 763         else
 764 #endif
 765         {
 766 #ifdef BIGBAD_IODBG
 767                 char fn [SIZ];
 768                 FILE *fd;
 769                 int len, rlen, nlen, nrlen;
 770                 const char *pch;
 771
 772                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 773
 774                 fd = fopen(fn, "a+");
 775                 if (fd == NULL) {
 776                         syslog(LOG_ERR, "%s: %s", fn, strerror(errno));
 777                         cit_backtrace();
 778                         exit(1);
 779                 }
 780                 pch = ChrPtr(CCC->RecvBuf.Buf);
 781                 len = StrLength(CCC->RecvBuf.Buf);
 782                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 783                         rlen = CCC->RecvBuf.ReadWritePointer - pch;
 784                 else
 785                         rlen = 0;
 786
 787 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 788                         len, rlen, pch);
 789 */
 790                 fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \n_____________________\n",
 791                         len, rlen);
 792 #endif
 793                 rc = StrBufTCP_read_buffered_line_fast(Target,
 794                                                        CCC->RecvBuf.Buf,
 795                                                        &CCC->RecvBuf.ReadWritePointer,
 796                                                        &CCC->client_socket,
 797                                                        5,
 798                                                        1,
 799                                                        &Error
 800                 );
 801
 802 #ifdef BIGBAD_IODBG
 803                 pch = ChrPtr(CCC->RecvBuf.Buf);
 804                 nlen = StrLength(CCC->RecvBuf.Buf);
 805                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 806                         nrlen = CCC->RecvBuf.ReadWritePointer - pch;
 807                 else
 808                         nrlen = 0;
 809 /*
 810                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 811                         len, nlen, rlen, nrlen, pch);
 812 */
 813                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 814                         len, nlen, rlen, nrlen);
 815
 816                 fprintf(fd, "Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 817                         StrLength(Target), ChrPtr(Target));
 818                 fclose(fd);
 819
 820                 if ((rc < 0) && (Error != NULL)) {
 821                         syslog(LOG_ERR, "sysdep: CtdlClientGetLine() failed: %s", Error);
 822                 }
 823 #endif
 824                 return rc;
 825         }
 826 }
 827
 828
 829 /*
 830  * client_getln()   ...   Get a LF-terminated line of text from the client.
 831  * (This is implemented in terms of client_read() and could be
 832  * justifiably moved out of sysdep.c)
 833  */
 834 int client_getln(char *buf, int bufsize)
 835 {
 836         int i, retval;
 837         CitContext *CCC=CC;
 838         const char *pCh;
 839
 840         retval = CtdlClientGetLine(CCC->MigrateBuf);
 841         if (retval < 0)
 842           return(retval >= 0);
 843
 844
 845         i = StrLength(CCC->MigrateBuf);
 846         pCh = ChrPtr(CCC->MigrateBuf);
 847         /* Strip the trailing LF, and the trailing CR if present.
 848          */
 849         if (bufsize <= i)
 850                 i = bufsize - 1;
 851         while ( (i > 0)
 852                 && ( (pCh[i - 1]==13)
 853                      || ( pCh[i - 1]==10)) ) {
 854                 i--;
 855         }
 856         memcpy(buf, pCh, i);
 857         buf[i] = 0;
 858
 859         FlushStrBuf(CCC->MigrateBuf);
 860         if (retval < 0) {
 861                 safestrncpy(&buf[i], "000", bufsize - i);
 862         }
 863         return(retval >= 0);
 864 }
 865
 866
 867 /*
 868  * Cleanup any contexts that are left lying around
 869  */
 870
 871
 872 void close_masters (void)
 873 {
 874         struct ServiceFunctionHook *serviceptr;
 875         const char *Text;
 876
 877         /*
 878          * close all protocol master sockets
 879          */
 880         for (serviceptr = ServiceHookTable; serviceptr != NULL;
 881             serviceptr = serviceptr->next ) {
 882
 883                 if (serviceptr->tcp_port > 0)
 884                 {
 885                         if (serviceptr->msock == -1) {
 886                                 Text = "not closing again";
 887                         }
 888                         else {
 889                                 Text = "Closing";
 890                         }
 891                         syslog(LOG_INFO, "sysdep: %s %d listener on port %d",
 892                                Text,
 893                                serviceptr->msock,
 894                                serviceptr->tcp_port
 895                         );
 896                         serviceptr->tcp_port = 0;
 897                 }
 898
 899                 if (serviceptr->sockpath != NULL)
 900                 {
 901                         if (serviceptr->msock == -1) {
 902                                 Text = "not closing again";
 903                         }
 904                         else {
 905                                 Text = "Closing";
 906                         }
 907                         syslog(LOG_INFO, "sysdep: %s %d listener on '%s'",
 908                                Text,
 909                                serviceptr->msock,
 910                                serviceptr->sockpath
 911                         );
 912                 }
 913
 914                 if (serviceptr->msock != -1)
 915                 {
 916                         close(serviceptr->msock);
 917                         serviceptr->msock = -1;
 918                 }
 919
 920                 /* If it's a Unix domain socket, remove the file. */
 921                 if (serviceptr->sockpath != NULL) {
 922                         unlink(serviceptr->sockpath);
 923                         serviceptr->sockpath = NULL;
 924                 }
 925         }
 926 }
 927
 928
 929 /*
 930  * The system-dependent part of master_cleanup() - close the master socket.
 931  */
 932 void sysdep_master_cleanup(void) {
 933
 934         close_masters();
 935
 936         context_cleanup();
 937
 938 #ifdef HAVE_OPENSSL
 939         destruct_ssl();
 940 #endif
 941         CtdlDestroyProtoHooks();
 942         CtdlDestroyDeleteHooks();
 943         CtdlDestroyXmsgHooks();
 944         CtdlDestroyNetprocHooks();
 945         CtdlDestroyUserHooks();
 946         CtdlDestroyMessageHook();
 947         CtdlDestroyCleanupHooks();
 948         CtdlDestroyFixedOutputHooks();
 949         CtdlDestroySessionHooks();
 950         CtdlDestroyServiceHook();
 951         CtdlDestroyRoomHooks();
 952         CtdlDestroySearchHooks();
 953         CtdlDestroyDebugTable();
 954         #ifdef HAVE_BACKTRACE
 955 ///     eCrash_Uninit();
 956         #endif
 957 }
 958
 959
 960
 961 pid_t current_child;
 962 void graceful_shutdown(int signum) {
 963         kill(current_child, signum);
 964         unlink(file_pid_file);
 965         exit(0);
 966 }
 967
 968 int nFireUps = 0;
 969 int nFireUpsNonRestart = 0;
 970 pid_t ForkedPid = 1;
 971
 972 /*
 973  * Start running as a daemon.
 974  */
 975 void start_daemon(int unused) {
 976         int status = 0;
 977         pid_t child = 0;
 978         FILE *fp;
 979         int do_restart = 0;
 980
 981         current_child = 0;
 982
 983         /* Close stdin/stdout/stderr and replace them with /dev/null.
 984          * We don't just call close() because we don't want these fd's
 985          * to be reused for other files.
 986          */
 987         if (chdir(ctdl_run_dir) != 0) {
 988                 syslog(LOG_ERR, "%s: %s", ctdl_run_dir, strerror(errno));
 989         }
 990
 991         child = fork();
 992         if (child != 0) {
 993                 exit(0);
 994         }
 995
 996         signal(SIGHUP, SIG_IGN);
 997         signal(SIGINT, SIG_IGN);
 998         signal(SIGQUIT, SIG_IGN);
 999
1000         setsid();
1001         umask(0);
1002         if (    (freopen("/dev/null", "r", stdin) != stdin) ||
1003                 (freopen("/dev/null", "w", stdout) != stdout) ||
1004                 (freopen("/dev/null", "w", stderr) != stderr)
1005         ) {
1006                 syslog(LOG_ERR, "sysdep: unable to reopen stdio: %s", strerror(errno));
1007         }
1008
1009         do {
1010                 current_child = fork();
1011                 signal(SIGTERM, graceful_shutdown);
1012                 if (current_child < 0) {
1013                         perror("fork");
1014                         exit(errno);
1015                 }
1016                 else if (current_child == 0) {
1017                         return; /* continue starting citadel. */
1018                 }
1019                 else {
1020                         fp = fopen(file_pid_file, "w");
1021                         if (fp != NULL) {
1022                                 fprintf(fp, ""F_PID_T"\n", getpid());
1023                                 fclose(fp);
1024                         }
1025                         waitpid(current_child, &status, 0);
1026                 }
1027                 nFireUpsNonRestart = nFireUps;
1028
1029                 /* Exit code 0 means the watcher should exit */
1030                 if (WIFEXITED(status) && (WEXITSTATUS(status) == CTDLEXIT_SHUTDOWN)) {
1031                         do_restart = 0;
1032                 }
1033
1034                 /* Exit code 101-109 means the watcher should exit */
1035                 else if (WIFEXITED(status) && (WEXITSTATUS(status) >= 101) && (WEXITSTATUS(status) <= 109)) {
1036                         do_restart = 0;
1037                 }
1038
1039                 /* Any other exit code, or no exit code, means we should restart. */
1040                 else {
1041                         do_restart = 1;
1042                         nFireUps++;
1043                         ForkedPid = current_child;
1044                 }
1045
1046         } while (do_restart);
1047
1048         unlink(file_pid_file);
1049         exit(WEXITSTATUS(status));
1050 }
1051
1052
1053
1054 void checkcrash(void)
1055 {
1056         if (nFireUpsNonRestart != nFireUps)
1057         {
1058                 StrBuf *CrashMail;
1059                 CrashMail = NewStrBuf();
1060                 syslog(LOG_ALERT, "sysdep: posting crash message");
1061                 StrBufPrintf(CrashMail,
1062                         " \n"
1063                         " The Citadel server process (citserver) terminated unexpectedly."
1064                         "\n \n"
1065                         " This could be the result of a bug in the server program, or some external "
1066                         "factor.\n \n"
1067                         " You can obtain more information about this by enabling core dumps.\n \n"
1068                         " For more information, please see:\n \n"
1069                         " http://citadel.org/doku.php?id=faq:mastering_your_os:gdb#how.do.i.make.my.system.produce.core-files"
1070                         "\n \n"
1071
1072                         " If you have already done this, the core dump is likely to be found at %score.%d\n"
1073                         ,
1074                         ctdl_run_dir, ForkedPid);
1075                 CtdlAideMessage(ChrPtr(CrashMail), "Citadel server process terminated unexpectedly");
1076                 FreeStrBuf(&CrashMail);
1077         }
1078 }
1079
1080
1081 /*
1082  * Generic routine to convert a login name to a full name (gecos)
1083  * Returns nonzero if a conversion took place
1084  */
1085 int convert_login(char NameToConvert[]) {
1086         struct passwd *pw;
1087         unsigned int a;
1088
1089         pw = getpwnam(NameToConvert);
1090         if (pw == NULL) {
1091                 return(0);
1092         }
1093         else {
1094                 strcpy(NameToConvert, pw->pw_gecos);
1095                 for (a=0; a<strlen(NameToConvert); ++a) {
1096                         if (NameToConvert[a] == ',') NameToConvert[a] = 0;
1097                 }
1098                 return(1);
1099         }
1100 }
1101
1102
1103
1104 void HuntBadSession(void)
1105 {
1106         int highest;
1107         CitContext *ptr;
1108         fd_set readfds;
1109         struct timeval tv;
1110         struct ServiceFunctionHook *serviceptr;
1111
1112
1113
1114         /* Next, add all of the client sockets. */
1115         begin_critical_section(S_SESSION_TABLE);
1116         for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1117                 if ((ptr->state == CON_SYS) && (ptr->client_socket == 0))
1118                         continue;
1119                 /* Initialize the fdset. */
1120                 FD_ZERO(&readfds);
1121                 highest = 0;
1122                 tv.tv_sec = 0;          /* wake up every second if no input */
1123                 tv.tv_usec = 0;
1124
1125                 /* Don't select on dead sessions, only truly idle ones */
1126                 if (    (ptr->state == CON_IDLE)
1127                         && (ptr->kill_me == 0)
1128                         && (ptr->client_socket > 0)
1129                         ) {
1130                         FD_SET(ptr->client_socket, &readfds);
1131                         if (ptr->client_socket > highest)
1132                                 highest = ptr->client_socket;
1133
1134                         if ((select(highest + 1, &readfds, NULL, NULL, &tv) < 0) &&
1135                             (errno == EBADF))
1136                         {
1137                                 /* Gotcha! */
1138                                 syslog(LOG_ERR,
1139                                        "sysdep: killing session CC[%d] bad FD: [%d:%d] User[%s] Host[%s:%s]",
1140                                        ptr->cs_pid,
1141                                        ptr->client_socket,
1142                                        ptr->is_local_socket,
1143                                        ptr->curr_user,
1144                                        ptr->cs_host,ptr->cs_addr);
1145
1146                                 ptr->kill_me = 1;
1147                                 ptr->client_socket = -1;
1148                                 break;
1149                         }
1150                 }
1151
1152         }
1153         end_critical_section(S_SESSION_TABLE);
1154
1155
1156         /* First, add the various master sockets to the fdset. */
1157         for (serviceptr = ServiceHookTable; serviceptr != NULL; serviceptr = serviceptr->next ) {
1158
1159                 /* Initialize the fdset. */
1160                 highest = 0;
1161                 tv.tv_sec = 0;          /* wake up every second if no input */
1162                 tv.tv_usec = 0;
1163
1164                 FD_SET(serviceptr->msock, &readfds);
1165                 if (serviceptr->msock > highest) {
1166                         highest = serviceptr->msock;
1167                 }
1168                 if ((select(highest + 1, &readfds, NULL, NULL, &tv) < 0) &&
1169                     (errno == EBADF))
1170                 {
1171                         /* Gotcha! server socket dead? commit suicide! */
1172                         syslog(LOG_ERR, "sysdep: found bad FD: %d and its a server socket! Shutting Down!", serviceptr->msock);
1173                         server_shutting_down = 1;
1174                         break;
1175                 }
1176         }
1177
1178
1179 }
1180
1181 const char *WorkerLogStr = "W";
1182 /*
1183  * This loop just keeps going and going and going...
1184  */
1185 void *worker_thread(void *blah) {
1186         int highest;
1187         CitContext *ptr;
1188         CitContext *bind_me = NULL;
1189         fd_set readfds;
1190         int retval = 0;
1191         struct timeval tv;
1192         int force_purge = 0;
1193         struct ServiceFunctionHook *serviceptr;
1194         int ssock;                      /* Descriptor for client socket */
1195         CitContext *con = NULL;         /* Temporary context pointer */
1196         int i;
1197
1198         pthread_mutex_lock(&ThreadCountMutex);
1199         ++num_workers;
1200         pthread_mutex_unlock(&ThreadCountMutex);
1201
1202         while (!server_shutting_down) {
1203
1204                 /* make doubly sure we're not holding any stale db handles
1205                  * which might cause a deadlock.
1206                  */
1207                 cdb_check_handles();
1208 do_select:      force_purge = 0;
1209                 bind_me = NULL;         /* Which session shall we handle? */
1210
1211                 /* Initialize the fdset. */
1212                 FD_ZERO(&readfds);
1213                 highest = 0;
1214
1215                 /* First, add the various master sockets to the fdset. */
1216                 for (serviceptr = ServiceHookTable; serviceptr != NULL; serviceptr = serviceptr->next ) {
1217                         FD_SET(serviceptr->msock, &readfds);
1218                         if (serviceptr->msock > highest) {
1219                                 highest = serviceptr->msock;
1220                         }
1221                 }
1222
1223                 /* Next, add all of the client sockets. */
1224                 begin_critical_section(S_SESSION_TABLE);
1225                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1226                         if ((ptr->state == CON_SYS) && (ptr->client_socket == 0))
1227                             continue;
1228
1229                         /* Don't select on dead sessions, only truly idle ones */
1230                         if (    (ptr->state == CON_IDLE)
1231                                 && (ptr->kill_me == 0)
1232                                 && (ptr->client_socket > 0)
1233                         ) {
1234                                 FD_SET(ptr->client_socket, &readfds);
1235                                 if (ptr->client_socket > highest)
1236                                         highest = ptr->client_socket;
1237                         }
1238                         if ((bind_me == NULL) && (ptr->state == CON_READY)) {
1239                                 bind_me = ptr;
1240                                 ptr->state = CON_EXECUTING;
1241                                 break;
1242                         }
1243                         if ((bind_me == NULL) && (ptr->state == CON_GREETING)) {
1244                                 bind_me = ptr;
1245                                 ptr->state = CON_STARTING;
1246                                 break;
1247                         }
1248                 }
1249                 end_critical_section(S_SESSION_TABLE);
1250
1251                 if (bind_me) {
1252                         goto SKIP_SELECT;
1253                 }
1254
1255                 /* If we got this far, it means that there are no sessions
1256                  * which a previous thread marked for attention, so we go
1257                  * ahead and get ready to select().
1258                  */
1259
1260                 if (!server_shutting_down) {
1261                         tv.tv_sec = 1;          /* wake up every second if no input */
1262                         tv.tv_usec = 0;
1263                         retval = select(highest + 1, &readfds, NULL, NULL, &tv);
1264                 }
1265                 else {
1266                         --num_workers;
1267                         return NULL;
1268                 }
1269
1270                 /* Now figure out who made this select() unblock.
1271                  * First, check for an error or exit condition.
1272                  */
1273                 if (retval < 0) {
1274                         if (errno == EBADF) {
1275                                 syslog(LOG_ERR, "sysdep: select() failed: (%s)", strerror(errno));
1276                                 HuntBadSession();
1277                                 goto do_select;
1278                         }
1279                         if (errno != EINTR) {
1280                                 syslog(LOG_ERR, "sysdep: exiting (%s)", strerror(errno));
1281                                 server_shutting_down = 1;
1282                                 continue;
1283                         } else {
1284                                 if (server_shutting_down) {
1285                                         --num_workers;
1286                                         return(NULL);
1287                                 }
1288                                 goto do_select;
1289                         }
1290                 }
1291                 else if (retval == 0) {
1292                         if (server_shutting_down) {
1293                                 --num_workers;
1294                                 return(NULL);
1295                         }
1296                 }
1297
1298                 /* Next, check to see if it's a new client connecting * on a master socket. */
1299
1300                 else if ((retval > 0) && (!server_shutting_down)) for (serviceptr = ServiceHookTable; serviceptr != NULL; serviceptr = serviceptr->next) {
1301
1302                         if (FD_ISSET(serviceptr->msock, &readfds)) {
1303                                 ssock = accept(serviceptr->msock, NULL, 0);
1304                                 if (ssock >= 0) {
1305                                         syslog(LOG_DEBUG, "sysdep: new client socket %d", ssock);
1306
1307                                         /* The master socket is non-blocking but the client
1308                                          * sockets need to be blocking, otherwise certain
1309                                          * operations barf on FreeBSD.  Not a fatal error.
1310                                          */
1311                                         if (fcntl(ssock, F_SETFL, 0) < 0) {
1312                                                 syslog(LOG_ERR, "sysdep: Can't set socket to blocking: %s", strerror(errno));
1313                                         }
1314
1315                                         /* New context will be created already
1316                                          * set up in the CON_EXECUTING state.
1317                                          */
1318                                         con = CreateNewContext();
1319
1320                                         /* Assign our new socket number to it. */
1321                                         con->tcp_port = serviceptr->tcp_port;
1322                                         con->client_socket = ssock;
1323                                         con->h_command_function = serviceptr->h_command_function;
1324                                         con->h_async_function = serviceptr->h_async_function;
1325                                         con->h_greeting_function = serviceptr->h_greeting_function;
1326                                         con->ServiceName = serviceptr->ServiceName;
1327
1328                                         /* Determine whether it's a local socket */
1329                                         if (serviceptr->sockpath != NULL) {
1330                                                 con->is_local_socket = 1;
1331                                         }
1332
1333                                         /* Set the SO_REUSEADDR socket option */
1334                                         i = 1;
1335                                         setsockopt(ssock, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
1336                                         con->state = CON_GREETING;
1337                                         retval--;
1338                                         if (retval == 0)
1339                                                 break;
1340                                 }
1341                         }
1342                 }
1343
1344                 /* It must be a client socket.  Find a context that has data
1345                  * waiting on its socket *and* is in the CON_IDLE state.  Any
1346                  * active sockets other than our chosen one are marked as
1347                  * CON_READY so the next thread that comes around can just bind
1348                  * to one without having to select() again.
1349                  */
1350                 begin_critical_section(S_SESSION_TABLE);
1351                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1352                         int checkfd = ptr->client_socket;
1353                         if ((checkfd != -1) && (ptr->state == CON_IDLE) ){
1354                                 if (FD_ISSET(checkfd, &readfds)) {
1355                                         ptr->input_waiting = 1;
1356                                         if (!bind_me) {
1357                                                 bind_me = ptr;  /* I choose you! */
1358                                                 bind_me->state = CON_EXECUTING;
1359                                         }
1360                                         else {
1361                                                 ptr->state = CON_READY;
1362                                         }
1363                                 } else if ((ptr->is_async) && (ptr->async_waiting) && (ptr->h_async_function)) {
1364                                         if (!bind_me) {
1365                                                 bind_me = ptr;  /* I choose you! */
1366                                                 bind_me->state = CON_EXECUTING;
1367                                         }
1368                                         else {
1369                                                 ptr->state = CON_READY;
1370                                         }
1371                                 }
1372                         }
1373                 }
1374                 end_critical_section(S_SESSION_TABLE);
1375
1376 SKIP_SELECT:
1377                 /* We're bound to a session */
1378                 pthread_mutex_lock(&ThreadCountMutex);
1379                 ++active_workers;
1380                 pthread_mutex_unlock(&ThreadCountMutex);
1381
1382                 if (bind_me != NULL) {
1383                         become_session(bind_me);
1384
1385                         if (bind_me->state == CON_STARTING) {
1386                                 bind_me->state = CON_EXECUTING;
1387                                 begin_session(bind_me);
1388                                 bind_me->h_greeting_function();
1389                         }
1390                         /* If the client has sent a command, execute it. */
1391                         if (CC->input_waiting) {
1392                                 CC->h_command_function();
1393
1394                                 while (HaveMoreLinesWaiting(CC))
1395                                        CC->h_command_function();
1396
1397                                 CC->input_waiting = 0;
1398                         }
1399
1400                         /* If there are asynchronous messages waiting and the
1401                          * client supports it, do those now */
1402                         if ((CC->is_async) && (CC->async_waiting)
1403                            && (CC->h_async_function != NULL)) {
1404                                 CC->h_async_function();
1405                                 CC->async_waiting = 0;
1406                         }
1407
1408                         force_purge = CC->kill_me;
1409                         become_session(NULL);
1410                         bind_me->state = CON_IDLE;
1411                 }
1412
1413                 dead_session_purge(force_purge);
1414                 do_housekeeping();
1415
1416                 pthread_mutex_lock(&ThreadCountMutex);
1417                 --active_workers;
1418                 if ((active_workers + CtdlGetConfigInt("c_min_workers") < num_workers) &&
1419                     (num_workers > CtdlGetConfigInt("c_min_workers")))
1420                 {
1421                         num_workers--;
1422                         pthread_mutex_unlock(&ThreadCountMutex);
1423                         return (NULL);
1424                 }
1425                 pthread_mutex_unlock(&ThreadCountMutex);
1426         }
1427
1428         /* If control reaches this point, the server is shutting down */
1429         pthread_mutex_lock(&ThreadCountMutex);
1430         --num_workers;
1431         pthread_mutex_unlock(&ThreadCountMutex);
1432         return(NULL);
1433 }
1434
1435
1436
1437 /*
1438  * SyslogFacility()
1439  * Translate text facility name to syslog.h defined value.
1440  */
1441 int SyslogFacility(char *name)
1442 {
1443         int i;
1444         struct
1445         {
1446                 int facility;
1447                 char *name;
1448         }   facTbl[] =
1449         {
1450                 {   LOG_KERN,   "kern"          },
1451                 {   LOG_USER,   "user"          },
1452                 {   LOG_MAIL,   "mail"          },
1453                 {   LOG_DAEMON, "daemon"        },
1454                 {   LOG_AUTH,   "auth"          },
1455                 {   LOG_SYSLOG, "syslog"        },
1456                 {   LOG_LPR,    "lpr"           },
1457                 {   LOG_NEWS,   "news"          },
1458                 {   LOG_UUCP,   "uucp"          },
1459                 {   LOG_LOCAL0, "local0"        },
1460                 {   LOG_LOCAL1, "local1"        },
1461                 {   LOG_LOCAL2, "local2"        },
1462                 {   LOG_LOCAL3, "local3"        },
1463                 {   LOG_LOCAL4, "local4"        },
1464                 {   LOG_LOCAL5, "local5"        },
1465                 {   LOG_LOCAL6, "local6"        },
1466                 {   LOG_LOCAL7, "local7"        },
1467                 {   0,            NULL          }
1468         };
1469         for(i = 0; facTbl[i].name != NULL; i++) {
1470                 if(!strcasecmp(name, facTbl[i].name))
1471                         return facTbl[i].facility;
1472         }
1473         return LOG_DAEMON;
1474 }