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