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) 1987-2021 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         if (pthread_key_create(&ThreadKey, NULL) != 0) {                        // TSD for threads
  90                 syslog(LOG_ERR, "pthread_key_create() : %m");
  91                 abort();
  92         }
  93
  94         if (pthread_key_create(&MyConKey, NULL) != 0) {                         // TSD for sessions
  95                 syslog(LOG_CRIT, "sysdep: can't create TSD key: %m");
  96                 abort();
  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)
 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                         syslog(LOG_ALERT, "tcpserver: inet_pton: %m");
 161                         return (-1);
 162                 }
 163         }
 164         else                                                                            /* specific IPv6 */
 165         {
 166                 ip_version = 6;
 167                 if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
 168                         syslog(LOG_ALERT, "tcpserver: inet_pton: %m");
 169                         return (-1);
 170                 }
 171         }
 172
 173         if (port_number == 0) {
 174                 syslog(LOG_ALERT, "tcpserver: no port number was specified");
 175                 return (-1);
 176         }
 177         sin6.sin6_port = htons((u_short) port_number);
 178         sin4.sin_port = htons((u_short) port_number);
 179
 180         p = getprotobyname("tcp");
 181         if (p == NULL) {
 182                 syslog(LOG_ALERT, "tcpserver: getprotobyname: %m");
 183                 return (-1);
 184         }
 185
 186         s = socket( ((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
 187         if (s < 0) {
 188                 syslog(LOG_ALERT, "tcpserver: socket: %m");
 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                 syslog(LOG_ALERT, "tcpserver: bind: %m");
 204                 return (-1);
 205         }
 206
 207         fcntl(s, F_SETFL, O_NONBLOCK);
 208
 209         if (listen(s, ((queue_len >= 5) ? queue_len : 5) ) < 0) {
 210                 syslog(LOG_ALERT, "tcpserver: listen: %m");
 211                 return (-1);
 212         }
 213         return (s);
 214 }
 215
 216
 217 /*
 218  * Create a Unix domain socket and listen on it
 219  */
 220 int ctdl_uds_server(char *sockpath, int queue_len)
 221 {
 222         struct sockaddr_un addr;
 223         int s;
 224         int i;
 225         int actual_queue_len;
 226 #ifdef HAVE_STRUCT_UCRED
 227         int passcred = 1;
 228 #endif
 229
 230         actual_queue_len = queue_len;
 231         if (actual_queue_len < 5) actual_queue_len = 5;
 232
 233         i = unlink(sockpath);
 234         if ((i != 0) && (errno != ENOENT)) {
 235                 syslog(LOG_ERR, "udsserver: %m");
 236                 return(-1);
 237         }
 238
 239         memset(&addr, 0, sizeof(addr));
 240         addr.sun_family = AF_UNIX;
 241         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 242
 243         s = socket(AF_UNIX, SOCK_STREAM, 0);
 244         if (s < 0) {
 245                 syslog(LOG_ERR, "udsserver: socket: %m");
 246                 return(-1);
 247         }
 248
 249         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 250                 syslog(LOG_ERR, "udsserver: bind: %m");
 251                 return(-1);
 252         }
 253
 254         /* set to nonblock - we need this for some obscure situations */
 255         if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
 256                 syslog(LOG_ERR, "udsserver: fcntl: %m");
 257                 close(s);
 258                 return(-1);
 259         }
 260
 261         if (listen(s, actual_queue_len) < 0) {
 262                 syslog(LOG_ERR, "udsserver: listen: %m");
 263                 return(-1);
 264         }
 265
 266 #ifdef HAVE_STRUCT_UCRED
 267         setsockopt(s, SOL_SOCKET, SO_PASSCRED, &passcred, sizeof(passcred));
 268 #endif
 269
 270         chmod(sockpath, S_ISGID|S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
 271         return(s);
 272 }
 273
 274
 275 /*
 276  * The following functions implement output buffering on operating systems which
 277  * support it (such as Linux and various BSD flavors).
 278  */
 279 #ifndef HAVE_DARWIN
 280 #ifdef TCP_CORK
 281 #       define HAVE_TCP_BUFFERING
 282 #else
 283 #       ifdef TCP_NOPUSH
 284 #               define HAVE_TCP_BUFFERING
 285 #               define TCP_CORK TCP_NOPUSH
 286 #       endif
 287 #endif /* TCP_CORK */
 288 #endif /* HAVE_DARWIN */
 289
 290 static unsigned on = 1, off = 0;
 291
 292 void buffer_output(void) {
 293 #ifdef HAVE_TCP_BUFFERING
 294 #ifdef HAVE_OPENSSL
 295         if (!CC->redirect_ssl)
 296 #endif
 297                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 298 #endif
 299 }
 300
 301 void unbuffer_output(void) {
 302 #ifdef HAVE_TCP_BUFFERING
 303 #ifdef HAVE_OPENSSL
 304         if (!CC->redirect_ssl)
 305 #endif
 306                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 307 #endif
 308 }
 309
 310 void flush_output(void) {
 311 #ifdef HAVE_TCP_BUFFERING
 312         struct CitContext *CCC = CC;
 313         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 314         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 315 #endif
 316 }
 317
 318 /*
 319 static void flush_client_inbuf(void)
 320 {
 321         CitContext *CCC=CC;
 322
 323         FlushStrBuf(CCC->ReadBuf);
 324         CCC->RecvBuf->ReadWritePointer = NULL;
 325 }
 326 */
 327
 328
 329 /*
 330  * client_close()       ...     close the client socket
 331  */
 332 void client_close(void) {
 333         CitContext *CCC = CC;
 334
 335         if (!CCC) return;
 336         if (CCC->client_socket <= 0) return;
 337         syslog(LOG_DEBUG, "sysdep: closing socket %d", CCC->client_socket);
 338         close(CCC->client_socket);
 339         CCC->client_socket = -1 ;
 340 }
 341
 342
 343 /*
 344  * client_write()   ...    Send binary data to the client.
 345  */
 346 int client_write(const char *buf, int nbytes)
 347 {
 348         int bytes_written = 0;
 349         int retval;
 350 #ifndef HAVE_TCP_BUFFERING
 351         int old_buffer_len = 0;
 352 #endif
 353         fd_set wset;
 354         CitContext *Ctx;
 355         int fdflags;
 356
 357         if (nbytes < 1) return(0);
 358
 359         Ctx = CC;
 360
 361 #ifdef BIGBAD_IODBG
 362         {
 363                 int rv = 0;
 364                 char fn [SIZ];
 365                 FILE *fd;
 366
 367                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", Ctx->ServiceName, Ctx->cs_pid);
 368
 369                 fd = fopen(fn, "a+");
 370                 if (fd == NULL) {
 371                         syslog(LOG_ERR, "%s: %m", fn);
 372                         exit(1);
 373                 }
 374                 fprintf(fd, "Sending: BufSize: %d BufContent: [", nbytes);
 375                 rv = fwrite(buf, nbytes, 1, fd);
 376                 fprintf(fd, "]\n");
 377                 fclose(fd);
 378         }
 379 #endif
 380 //      flush_client_inbuf();
 381         if (Ctx->redirect_buffer != NULL) {
 382                 StrBufAppendBufPlain(Ctx->redirect_buffer,
 383                                      buf, nbytes, 0);
 384                 return 0;
 385         }
 386
 387 #ifdef HAVE_OPENSSL
 388         if (Ctx->redirect_ssl) {
 389                 client_write_ssl(buf, nbytes);
 390                 return 0;
 391         }
 392 #endif
 393         if (Ctx->client_socket == -1) return -1;
 394
 395         fdflags = fcntl(Ctx->client_socket, F_GETFL);
 396
 397         while ((bytes_written < nbytes) && (Ctx->client_socket != -1)){
 398                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 399                         FD_ZERO(&wset);
 400                         FD_SET(Ctx->client_socket, &wset);
 401                         if (select(1, NULL, &wset, NULL, NULL) == -1) {
 402                                 if (errno == EINTR)
 403                                 {
 404                                         syslog(LOG_DEBUG, "sysdep: client_write(%d bytes) select() interrupted.", nbytes-bytes_written);
 405                                         if (server_shutting_down) {
 406                                                 CC->kill_me = KILLME_SELECT_INTERRUPTED;
 407                                                 return (-1);
 408                                         } else {
 409                                                 /* can't trust fd's and stuff so we need to re-create them */
 410                                                 continue;
 411                                         }
 412                                 } else {
 413                                         syslog(LOG_ERR, "sysdep: client_write(%d bytes) select failed: %m", nbytes - bytes_written);
 414                                         client_close();
 415                                         Ctx->kill_me = KILLME_SELECT_FAILED;
 416                                         return -1;
 417                                 }
 418                         }
 419                 }
 420
 421                 retval = write(Ctx->client_socket, &buf[bytes_written], nbytes - bytes_written);
 422                 if (retval < 1) {
 423                         syslog(LOG_ERR, "sysdep: client_write(%d bytes) failed: %m", nbytes - bytes_written);
 424                         client_close();
 425                         Ctx->kill_me = KILLME_WRITE_FAILED;
 426                         return -1;
 427                 }
 428                 bytes_written = bytes_written + retval;
 429         }
 430         return 0;
 431 }
 432
 433 void cputbuf(const StrBuf *Buf) {
 434         client_write(ChrPtr(Buf), StrLength(Buf));
 435 }
 436
 437
 438 /*
 439  * cprintf()    Send formatted printable data to the client.
 440  *              Implemented in terms of client_write() so it's technically not sysdep...
 441  */
 442 void cprintf(const char *format, ...) {
 443         va_list arg_ptr;
 444         char buf[1024];
 445
 446         va_start(arg_ptr, format);
 447         if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
 448                 buf[sizeof buf - 2] = '\n';
 449         client_write(buf, strlen(buf));
 450         va_end(arg_ptr);
 451 }
 452
 453
 454 /*
 455  * Read data from the client socket.
 456  *
 457  * sock         socket fd to read from
 458  * buf          buffer to read into
 459  * bytes        number of bytes to read
 460  * timeout      Number of seconds to wait before timing out
 461  *
 462  * Possible return values:
 463  *      1       Requested number of bytes has been read.
 464  *      0       Request timed out.
 465  *      -1      Connection is broken, or other error.
 466  */
 467 int client_read_blob(StrBuf *Target, int bytes, int timeout)
 468 {
 469         CitContext *CCC=CC;
 470         const char *Error;
 471         int retval = 0;
 472
 473 #ifdef HAVE_OPENSSL
 474         if (CCC->redirect_ssl) {
 475 #ifdef BIGBAD_IODBG
 476                 int rv = 0;
 477                 char fn [SIZ];
 478                 FILE *fd;
 479
 480                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 481
 482                 fd = fopen(fn, "a+");
 483                 if (fd == NULL) {
 484                         syslog(LOG_ERR, "%s: %m", fn);
 485                         exit(1);
 486                 }
 487                 fprintf(fd, "Reading BLOB: BufSize: %d ", bytes);
 488                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 489                 fprintf(fd, "]\n");
 490
 491
 492                 fclose(fd);
 493 #endif
 494                 retval = client_read_sslblob(Target, bytes, timeout);
 495                 if (retval < 0) {
 496                         syslog(LOG_ERR, "sysdep: client_read_blob() failed");
 497                 }
 498 #ifdef BIGBAD_IODBG
 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: %m", fn);
 504                         exit(1);
 505                 }
 506                 fprintf(fd, "Read: %d BufContent: [", StrLength(Target));
 507                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 508                 fprintf(fd, "]\n");
 509                 fclose(fd);
 510 #endif
 511         }
 512         else
 513 #endif
 514         {
 515 #ifdef BIGBAD_IODBG
 516                 int rv = 0;
 517                 char fn [SIZ];
 518                 FILE *fd;
 519
 520                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 521
 522                 fd = fopen(fn, "a+");
 523                 if (fd == NULL) {
 524                         syslog(LOG_ERR, "%s: %m", fn);
 525                         exit(1);
 526                 }
 527                 fprintf(fd, "Reading BLOB: BufSize: %d ",
 528                         bytes);
 529                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 530                 fprintf(fd, "]\n");
 531                 fclose(fd);
 532 #endif
 533                 retval = StrBufReadBLOBBuffered(Target,
 534                                                 CCC->RecvBuf.Buf,
 535                                                 &CCC->RecvBuf.ReadWritePointer,
 536                                                 &CCC->client_socket,
 537                                                 1,
 538                                                 bytes,
 539                                                 O_TERM,
 540                                                 &Error
 541                 );
 542                 if (retval < 0) {
 543                         syslog(LOG_ERR, "sysdep: client_read_blob() failed: %s", Error);
 544                         client_close();
 545                         return retval;
 546                 }
 547 #ifdef BIGBAD_IODBG
 548                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 549
 550                 fd = fopen(fn, "a+");
 551                 if (fd == NULL) {
 552                         syslog(LOG_ERR, "%s: %m", fn);
 553                         exit(1);
 554                 }
 555                 fprintf(fd, "Read: %d BufContent: [",
 556                         StrLength(Target));
 557                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 558                 fprintf(fd, "]\n");
 559                 fclose(fd);
 560 #endif
 561         }
 562         return retval;
 563 }
 564
 565
 566 /*
 567  * to make client_read_random_blob() more efficient, increase buffer size.
 568  * just use in greeting function, else your buffer may be flushed
 569  */
 570 void client_set_inbound_buf(long N)
 571 {
 572         CitContext *CCC=CC;
 573         FlushStrBuf(CCC->RecvBuf.Buf);
 574         ReAdjustEmptyBuf(CCC->RecvBuf.Buf, N * SIZ, N * SIZ);
 575 }
 576
 577 int client_read_random_blob(StrBuf *Target, int timeout)
 578 {
 579         CitContext *CCC=CC;
 580         int rc;
 581
 582         rc =  client_read_blob(Target, 1, timeout);
 583         if (rc > 0)
 584         {
 585                 long len;
 586                 const char *pch;
 587
 588                 len = StrLength(CCC->RecvBuf.Buf);
 589                 pch = ChrPtr(CCC->RecvBuf.Buf);
 590
 591                 if (len > 0)
 592                 {
 593                         if (CCC->RecvBuf.ReadWritePointer != NULL) {
 594                                 len -= CCC->RecvBuf.ReadWritePointer - pch;
 595                                 pch = CCC->RecvBuf.ReadWritePointer;
 596                         }
 597                         StrBufAppendBufPlain(Target, pch, len, 0);
 598                         FlushStrBuf(CCC->RecvBuf.Buf);
 599                         CCC->RecvBuf.ReadWritePointer = NULL;
 600 #ifdef BIGBAD_IODBG
 601                         {
 602                                 int rv = 0;
 603                                 char fn [SIZ];
 604                                 FILE *fd;
 605
 606                                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 607
 608                                 fd = fopen(fn, "a+");
 609                                 if (fd == NULL) {
 610                                         syslog(LOG_ERR, "%s: %m", fn);
 611                                         exit(1);
 612                                 }
 613                                 fprintf(fd, "Read: BufSize: %d BufContent: [",
 614                                         StrLength(Target));
 615                                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 616                                 fprintf(fd, "]\n");
 617                                 fclose(fd);
 618                         }
 619 #endif
 620                         return StrLength(Target);
 621                 }
 622                 return rc;
 623         }
 624         else
 625                 return rc;
 626 }
 627
 628 int client_read_to(char *buf, int bytes, int timeout)
 629 {
 630         CitContext *CCC=CC;
 631         int rc;
 632
 633         rc = client_read_blob(CCC->MigrateBuf, bytes, timeout);
 634         if (rc < 0)
 635         {
 636                 *buf = '\0';
 637                 return rc;
 638         }
 639         else
 640         {
 641                 memcpy(buf,
 642                        ChrPtr(CCC->MigrateBuf),
 643                        StrLength(CCC->MigrateBuf) + 1);
 644                 FlushStrBuf(CCC->MigrateBuf);
 645                 return rc;
 646         }
 647 }
 648
 649
 650 int HaveMoreLinesWaiting(CitContext *CCC)
 651 {
 652         if ((CCC->kill_me != 0) ||
 653             ( (CCC->RecvBuf.ReadWritePointer == NULL) &&
 654               (StrLength(CCC->RecvBuf.Buf) == 0) &&
 655               (CCC->client_socket != -1)) )
 656                 return 0;
 657         else
 658                 return 1;
 659 }
 660
 661
 662 /*
 663  * Read data from the client socket with default timeout.
 664  * (This is implemented in terms of client_read_to() and could be
 665  * justifiably moved out of sysdep.c)
 666  */
 667 INLINE int client_read(char *buf, int bytes)
 668 {
 669         return(client_read_to(buf, bytes, CtdlGetConfigInt("c_sleeping")));
 670 }
 671
 672 int CtdlClientGetLine(StrBuf *Target)
 673 {
 674         CitContext *CCC=CC;
 675         const char *Error;
 676         int rc;
 677
 678         FlushStrBuf(Target);
 679 #ifdef HAVE_OPENSSL
 680         if (CCC->redirect_ssl) {
 681 #ifdef BIGBAD_IODBG
 682                 char fn [SIZ];
 683                 FILE *fd;
 684                 int len = 0;
 685                 int rlen = 0;
 686                 int  nlen = 0;
 687                 int nrlen = 0;
 688                 const char *pch;
 689
 690                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 691
 692                 fd = fopen(fn, "a+");
 693                 if (fd == NULL) {
 694                         syslog(LOG_ERR, "%s: %m", fn);
 695                         exit(1);
 696                 }
 697                 pch = ChrPtr(CCC->RecvBuf.Buf);
 698                 len = StrLength(CCC->RecvBuf.Buf);
 699                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 700                         rlen = CCC->RecvBuf.ReadWritePointer - pch;
 701                 else
 702                         rlen = 0;
 703
 704 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 705                         len, rlen, pch);
 706 */
 707                 fprintf(fd, "\n\n\nSSL1: BufSize: %d BufPos: %d \n_____________________\n",
 708                         len, rlen);
 709 #endif
 710                 rc = client_readline_sslbuffer(Target,
 711                                                CCC->RecvBuf.Buf,
 712                                                &CCC->RecvBuf.ReadWritePointer,
 713                                                1);
 714 #ifdef BIGBAD_IODBG
 715                 pch = ChrPtr(CCC->RecvBuf.Buf);
 716                 nlen = StrLength(CCC->RecvBuf.Buf);
 717                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 718                         nrlen = CCC->RecvBuf.ReadWritePointer - pch;
 719                 else
 720                         nrlen = 0;
 721 /*
 722                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 723                         len, nlen, rlen, nrlen, pch);
 724 */
 725                 fprintf(fd, "\n\n\nSSL2: BufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 726                         len, nlen, rlen, nrlen);
 727
 728                 fprintf(fd, "SSL3: Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 729                         StrLength(Target), ChrPtr(Target));
 730                 fclose(fd);
 731
 732                 if (rc < 0) {
 733                         syslog(LOG_ERR, "sysdep: CtdlClientGetLine() failed");
 734                 }
 735 #endif
 736                 return rc;
 737         }
 738         else
 739 #endif
 740         {
 741 #ifdef BIGBAD_IODBG
 742                 char fn [SIZ];
 743                 FILE *fd;
 744                 int len, rlen, nlen, nrlen;
 745                 const char *pch;
 746
 747                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 748
 749                 fd = fopen(fn, "a+");
 750                 if (fd == NULL) {
 751                         syslog(LOG_ERR, "%s: %m", fn);
 752                         exit(1);
 753                 }
 754                 pch = ChrPtr(CCC->RecvBuf.Buf);
 755                 len = StrLength(CCC->RecvBuf.Buf);
 756                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 757                         rlen = CCC->RecvBuf.ReadWritePointer - pch;
 758                 else
 759                         rlen = 0;
 760
 761 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 762                         len, rlen, pch);
 763 */
 764                 fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \n_____________________\n",
 765                         len, rlen);
 766 #endif
 767                 rc = StrBufTCP_read_buffered_line_fast(Target,
 768                                                        CCC->RecvBuf.Buf,
 769                                                        &CCC->RecvBuf.ReadWritePointer,
 770                                                        &CCC->client_socket,
 771                                                        5,
 772                                                        1,
 773                                                        &Error
 774                 );
 775
 776 #ifdef BIGBAD_IODBG
 777                 pch = ChrPtr(CCC->RecvBuf.Buf);
 778                 nlen = StrLength(CCC->RecvBuf.Buf);
 779                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 780                         nrlen = CCC->RecvBuf.ReadWritePointer - pch;
 781                 else
 782                         nrlen = 0;
 783 /*
 784                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 785                         len, nlen, rlen, nrlen, pch);
 786 */
 787                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 788                         len, nlen, rlen, nrlen);
 789
 790                 fprintf(fd, "Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 791                         StrLength(Target), ChrPtr(Target));
 792                 fclose(fd);
 793
 794                 if ((rc < 0) && (Error != NULL)) {
 795                         syslog(LOG_ERR, "sysdep: CtdlClientGetLine() failed: %s", Error);
 796                 }
 797 #endif
 798                 return rc;
 799         }
 800 }
 801
 802
 803 /*
 804  * client_getln()   ...   Get a LF-terminated line of text from the client.
 805  * (This is implemented in terms of client_read() and could be
 806  * justifiably moved out of sysdep.c)
 807  */
 808 int client_getln(char *buf, int bufsize)
 809 {
 810         int i, retval;
 811         CitContext *CCC=CC;
 812         const char *pCh;
 813
 814         retval = CtdlClientGetLine(CCC->MigrateBuf);
 815         if (retval < 0)
 816           return(retval >= 0);
 817
 818
 819         i = StrLength(CCC->MigrateBuf);
 820         pCh = ChrPtr(CCC->MigrateBuf);
 821         /* Strip the trailing LF, and the trailing CR if present.
 822          */
 823         if (bufsize <= i)
 824                 i = bufsize - 1;
 825         while ( (i > 0)
 826                 && ( (pCh[i - 1]==13)
 827                      || ( pCh[i - 1]==10)) ) {
 828                 i--;
 829         }
 830         memcpy(buf, pCh, i);
 831         buf[i] = 0;
 832
 833         FlushStrBuf(CCC->MigrateBuf);
 834         if (retval < 0) {
 835                 safestrncpy(&buf[i], "000", bufsize - i);
 836         }
 837         return(retval >= 0);
 838 }
 839
 840
 841 /*
 842  * Cleanup any contexts that are left lying around
 843  */
 844
 845
 846 void close_masters (void)
 847 {
 848         struct ServiceFunctionHook *serviceptr;
 849         const char *Text;
 850
 851         /*
 852          * close all protocol master sockets
 853          */
 854         for (serviceptr = ServiceHookTable; serviceptr != NULL;
 855             serviceptr = serviceptr->next ) {
 856
 857                 if (serviceptr->tcp_port > 0)
 858                 {
 859                         if (serviceptr->msock == -1) {
 860                                 Text = "not closing again";
 861                         }
 862                         else {
 863                                 Text = "Closing";
 864                         }
 865                         syslog(LOG_INFO, "sysdep: %s %d listener on port %d",
 866                                Text,
 867                                serviceptr->msock,
 868                                serviceptr->tcp_port
 869                         );
 870                         serviceptr->tcp_port = 0;
 871                 }
 872
 873                 if (serviceptr->sockpath != NULL)
 874                 {
 875                         if (serviceptr->msock == -1) {
 876                                 Text = "not closing again";
 877                         }
 878                         else {
 879                                 Text = "Closing";
 880                         }
 881                         syslog(LOG_INFO, "sysdep: %s %d listener on '%s'",
 882                                Text,
 883                                serviceptr->msock,
 884                                serviceptr->sockpath
 885                         );
 886                 }
 887
 888                 if (serviceptr->msock != -1)
 889                 {
 890                         close(serviceptr->msock);
 891                         serviceptr->msock = -1;
 892                 }
 893
 894                 /* If it's a Unix domain socket, remove the file. */
 895                 if (serviceptr->sockpath != NULL) {
 896                         unlink(serviceptr->sockpath);
 897                         serviceptr->sockpath = NULL;
 898                 }
 899         }
 900 }
 901
 902
 903 /*
 904  * The system-dependent part of master_cleanup() - close the master socket.
 905  */
 906 void sysdep_master_cleanup(void) {
 907
 908         close_masters();
 909
 910         context_cleanup();
 911
 912 #ifdef HAVE_OPENSSL
 913         destruct_ssl();
 914 #endif
 915         CtdlDestroyProtoHooks();
 916         CtdlDestroyDeleteHooks();
 917         CtdlDestroyXmsgHooks();
 918         CtdlDestroyUserHooks();
 919         CtdlDestroyMessageHook();
 920         CtdlDestroyCleanupHooks();
 921         CtdlDestroyFixedOutputHooks();
 922         CtdlDestroySessionHooks();
 923         CtdlDestroyServiceHook();
 924         CtdlDestroyRoomHooks();
 925         CtdlDestroySearchHooks();
 926 }
 927
 928
 929
 930 pid_t current_child;
 931 void graceful_shutdown(int signum) {
 932         kill(current_child, signum);
 933         unlink(file_pid_file);
 934         exit(0);
 935 }
 936
 937 int nFireUps = 0;
 938 int nFireUpsNonRestart = 0;
 939 pid_t ForkedPid = 1;
 940
 941 /*
 942  * Start running as a daemon.
 943  */
 944 void start_daemon(int unused) {
 945         int status = 0;
 946         pid_t child = 0;
 947         FILE *fp;
 948         int do_restart = 0;
 949         current_child = 0;
 950
 951         //if (chdir(ctdl_run_dir) != 0) {
 952                 //syslog(LOG_ERR, "%s: %m", ctdl_run_dir);
 953         //}
 954
 955         /* Close stdin/stdout/stderr and replace them with /dev/null.
 956          * We don't just call close() because we don't want these fd's
 957          * to be reused for other files.
 958          */
 959         child = fork();
 960         if (child != 0) {
 961                 exit(0);
 962         }
 963
 964         signal(SIGHUP, SIG_IGN);
 965         signal(SIGINT, SIG_IGN);
 966         signal(SIGQUIT, SIG_IGN);
 967
 968         setsid();
 969         umask(0);
 970         if (    (freopen("/dev/null", "r", stdin) != stdin) ||
 971                 (freopen("/dev/null", "w", stdout) != stdout) ||
 972                 (freopen("/dev/null", "w", stderr) != stderr)
 973         ) {
 974                 syslog(LOG_ERR, "sysdep: unable to reopen stdio: %m");
 975         }
 976
 977         do {
 978                 current_child = fork();
 979                 signal(SIGTERM, graceful_shutdown);
 980                 if (current_child < 0) {
 981                         perror("fork");
 982                         exit(errno);
 983                 }
 984                 else if (current_child == 0) {
 985                         return; /* continue starting citadel. */
 986                 }
 987                 else {
 988                         fp = fopen(file_pid_file, "w");
 989                         if (fp != NULL) {
 990                                 fprintf(fp, ""F_PID_T"\n", getpid());
 991                                 fclose(fp);
 992                         }
 993                         waitpid(current_child, &status, 0);
 994                 }
 995                 nFireUpsNonRestart = nFireUps;
 996
 997                 /* Exit code 0 means the watcher should exit */
 998                 if (WIFEXITED(status) && (WEXITSTATUS(status) == CTDLEXIT_SHUTDOWN)) {
 999                         do_restart = 0;
1000                 }
1001
1002                 /* Exit code 101-109 means the watcher should exit */
1003                 else if (WIFEXITED(status) && (WEXITSTATUS(status) >= 101) && (WEXITSTATUS(status) <= 109)) {
1004                         do_restart = 0;
1005                 }
1006
1007                 /* Any other exit code, or no exit code, means we should restart. */
1008                 else {
1009                         do_restart = 1;
1010                         nFireUps++;
1011                         ForkedPid = current_child;
1012                 }
1013
1014         } while (do_restart);
1015
1016         unlink(file_pid_file);
1017         exit(WEXITSTATUS(status));
1018 }
1019
1020
1021
1022 void checkcrash(void)
1023 {
1024         if (nFireUpsNonRestart != nFireUps)
1025         {
1026                 StrBuf *CrashMail;
1027                 CrashMail = NewStrBuf();
1028                 syslog(LOG_ALERT, "sysdep: posting crash message");
1029                 StrBufPrintf(CrashMail,
1030                         " \n"
1031                         " The Citadel server process (citserver) terminated unexpectedly."
1032                         "\n \n"
1033                         " This could be the result of a bug in the server program, or some external "
1034                         "factor.\n \n"
1035                         " You can obtain more information about this by enabling core dumps.\n \n"
1036                         " For more information, please see:\n \n"
1037                         " http://citadel.org/doku.php?id=faq:mastering_your_os:gdb#how.do.i.make.my.system.produce.core-files"
1038                         "\n \n"
1039
1040                         " If you have already done this, the core dump is likely to be found at %score.%d\n"
1041                         ,
1042                         ctdl_run_dir, ForkedPid);
1043                 CtdlAideMessage(ChrPtr(CrashMail), "Citadel server process terminated unexpectedly");
1044                 FreeStrBuf(&CrashMail);
1045         }
1046 }
1047
1048
1049 /*
1050  * Generic routine to convert a login name to a full name (gecos)
1051  * Returns nonzero if a conversion took place
1052  */
1053 int convert_login(char NameToConvert[]) {
1054         struct passwd *pw;
1055         unsigned int a;
1056
1057         pw = getpwnam(NameToConvert);
1058         if (pw == NULL) {
1059                 return(0);
1060         }
1061         else {
1062                 strcpy(NameToConvert, pw->pw_gecos);
1063                 for (a=0; a<strlen(NameToConvert); ++a) {
1064                         if (NameToConvert[a] == ',') NameToConvert[a] = 0;
1065                 }
1066                 return(1);
1067         }
1068 }
1069
1070
1071
1072 void HuntBadSession(void)
1073 {
1074         int highest;
1075         CitContext *ptr;
1076         fd_set readfds;
1077         struct timeval tv;
1078         struct ServiceFunctionHook *serviceptr;
1079
1080         /* Next, add all of the client sockets. */
1081         begin_critical_section(S_SESSION_TABLE);
1082         for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1083                 if ((ptr->state == CON_SYS) && (ptr->client_socket == 0))
1084                         continue;
1085                 /* Initialize the fdset. */
1086                 FD_ZERO(&readfds);
1087                 highest = 0;
1088                 tv.tv_sec = 0;          /* wake up every second if no input */
1089                 tv.tv_usec = 0;
1090
1091                 /* Don't select on dead sessions, only truly idle ones */
1092                 if (    (ptr->state == CON_IDLE)
1093                         && (ptr->kill_me == 0)
1094                         && (ptr->client_socket > 0)
1095                 ) {
1096                         FD_SET(ptr->client_socket, &readfds);
1097                         if (ptr->client_socket > highest)
1098                                 highest = ptr->client_socket;
1099
1100                         if ((select(highest + 1, &readfds, NULL, NULL, &tv) < 0) && (errno == EBADF))
1101                         {
1102                                 /* Gotcha! */
1103                                 syslog(LOG_ERR,
1104                                        "sysdep: killing session CC[%d] bad FD: [%d] User[%s] Host[%s:%s]",
1105                                         ptr->cs_pid,
1106                                         ptr->client_socket,
1107                                         ptr->curr_user,
1108                                         ptr->cs_host,
1109                                         ptr->cs_addr
1110                                 );
1111                                 ptr->kill_me = 1;
1112                                 ptr->client_socket = -1;
1113                                 break;
1114                         }
1115                 }
1116         }
1117         end_critical_section(S_SESSION_TABLE);
1118
1119         /* First, add the various master sockets to the fdset. */
1120         for (serviceptr = ServiceHookTable; serviceptr != NULL; serviceptr = serviceptr->next ) {
1121
1122                 /* Initialize the fdset. */
1123                 highest = 0;
1124                 tv.tv_sec = 0;          /* wake up every second if no input */
1125                 tv.tv_usec = 0;
1126
1127                 FD_SET(serviceptr->msock, &readfds);
1128                 if (serviceptr->msock > highest) {
1129                         highest = serviceptr->msock;
1130                 }
1131                 if ((select(highest + 1, &readfds, NULL, NULL, &tv) < 0) &&
1132                     (errno == EBADF))
1133                 {
1134                         /* Gotcha! server socket dead? commit suicide! */
1135                         syslog(LOG_ERR, "sysdep: found bad FD: %d and its a server socket! Shutting Down!", serviceptr->msock);
1136                         server_shutting_down = 1;
1137                         break;
1138                 }
1139         }
1140 }
1141
1142
1143 /*
1144  * This loop just keeps going and going and going...
1145  */
1146 void *worker_thread(void *blah) {
1147         int highest;
1148         CitContext *ptr;
1149         CitContext *bind_me = NULL;
1150         fd_set readfds;
1151         int retval = 0;
1152         struct timeval tv;
1153         int force_purge = 0;
1154         struct ServiceFunctionHook *serviceptr;
1155         int ssock;                      /* Descriptor for client socket */
1156         CitContext *con = NULL;         /* Temporary context pointer */
1157         int i;
1158
1159         pthread_mutex_lock(&ThreadCountMutex);
1160         ++num_workers;
1161         pthread_mutex_unlock(&ThreadCountMutex);
1162
1163         while (!server_shutting_down) {
1164
1165                 /* make doubly sure we're not holding any stale db handles * which might cause a deadlock */
1166                 cdb_check_handles();
1167 do_select:      force_purge = 0;
1168                 bind_me = NULL;         /* Which session shall we handle? */
1169
1170                 /* Initialize the fdset. */
1171                 FD_ZERO(&readfds);
1172                 highest = 0;
1173
1174                 /* First, add the various master sockets to the fdset. */
1175                 for (serviceptr = ServiceHookTable; serviceptr != NULL; serviceptr = serviceptr->next ) {
1176                         FD_SET(serviceptr->msock, &readfds);
1177                         if (serviceptr->msock > highest) {
1178                                 highest = serviceptr->msock;
1179                         }
1180                 }
1181
1182                 /* Next, add all of the client sockets. */
1183                 begin_critical_section(S_SESSION_TABLE);
1184                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1185                         if ((ptr->state == CON_SYS) && (ptr->client_socket == 0))
1186                             continue;
1187
1188                         /* Don't select on dead sessions, only truly idle ones */
1189                         if (    (ptr->state == CON_IDLE)
1190                                 && (ptr->kill_me == 0)
1191                                 && (ptr->client_socket > 0)
1192                         ) {
1193                                 FD_SET(ptr->client_socket, &readfds);
1194                                 if (ptr->client_socket > highest)
1195                                         highest = ptr->client_socket;
1196                         }
1197                         if ((bind_me == NULL) && (ptr->state == CON_READY)) {
1198                                 bind_me = ptr;
1199                                 ptr->state = CON_EXECUTING;
1200                                 break;
1201                         }
1202                         if ((bind_me == NULL) && (ptr->state == CON_GREETING)) {
1203                                 bind_me = ptr;
1204                                 ptr->state = CON_STARTING;
1205                                 break;
1206                         }
1207                 }
1208                 end_critical_section(S_SESSION_TABLE);
1209
1210                 if (bind_me) {
1211                         goto SKIP_SELECT;
1212                 }
1213
1214                 /* If we got this far, it means that there are no sessions
1215                  * which a previous thread marked for attention, so we go
1216                  * ahead and get ready to select().
1217                  */
1218
1219                 if (!server_shutting_down) {
1220                         tv.tv_sec = 1;          /* wake up every second if no input */
1221                         tv.tv_usec = 0;
1222                         retval = select(highest + 1, &readfds, NULL, NULL, &tv);
1223                 }
1224                 else {
1225                         --num_workers;
1226                         return NULL;
1227                 }
1228
1229                 /* Now figure out who made this select() unblock.
1230                  * First, check for an error or exit condition.
1231                  */
1232                 if (retval < 0) {
1233                         if (errno == EBADF) {
1234                                 syslog(LOG_ERR, "sysdep: select() failed: %m");
1235                                 HuntBadSession();
1236                                 goto do_select;
1237                         }
1238                         if (errno != EINTR) {
1239                                 syslog(LOG_ERR, "sysdep: exiting: %m");
1240                                 server_shutting_down = 1;
1241                                 continue;
1242                         } else {
1243                                 if (server_shutting_down) {
1244                                         --num_workers;
1245                                         return(NULL);
1246                                 }
1247                                 goto do_select;
1248                         }
1249                 }
1250                 else if (retval == 0) {
1251                         if (server_shutting_down) {
1252                                 --num_workers;
1253                                 return(NULL);
1254                         }
1255                 }
1256
1257                 /* Next, check to see if it's a new client connecting on a master socket. */
1258
1259                 else if ((retval > 0) && (!server_shutting_down)) for (serviceptr = ServiceHookTable; serviceptr != NULL; serviceptr = serviceptr->next) {
1260
1261                         if (FD_ISSET(serviceptr->msock, &readfds)) {
1262                                 ssock = accept(serviceptr->msock, NULL, 0);
1263                                 if (ssock >= 0) {
1264                                         syslog(LOG_DEBUG, "sysdep: new client socket %d", ssock);
1265
1266                                         /* The master socket is non-blocking but the client
1267                                          * sockets need to be blocking, otherwise certain
1268                                          * operations barf on FreeBSD.  Not a fatal error.
1269                                          */
1270                                         if (fcntl(ssock, F_SETFL, 0) < 0) {
1271                                                 syslog(LOG_ERR, "sysdep: Can't set socket to blocking: %m");
1272                                         }
1273
1274                                         /* New context will be created already
1275                                          * set up in the CON_EXECUTING state.
1276                                          */
1277                                         con = CreateNewContext();
1278
1279                                         /* Assign our new socket number to it. */
1280                                         con->tcp_port = serviceptr->tcp_port;
1281                                         con->client_socket = ssock;
1282                                         con->h_command_function = serviceptr->h_command_function;
1283                                         con->h_async_function = serviceptr->h_async_function;
1284                                         con->h_greeting_function = serviceptr->h_greeting_function;
1285                                         con->ServiceName = serviceptr->ServiceName;
1286
1287                                         /* Connections on a local client are always from the same host */
1288                                         if (serviceptr->sockpath != NULL) {
1289                                                 con->is_local_client = 1;
1290                                         }
1291
1292                                         /* Set the SO_REUSEADDR socket option */
1293                                         i = 1;
1294                                         setsockopt(ssock, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
1295                                         con->state = CON_GREETING;
1296                                         retval--;
1297                                         if (retval == 0)
1298                                                 break;
1299                                 }
1300                         }
1301                 }
1302
1303                 /* It must be a client socket.  Find a context that has data
1304                  * waiting on its socket *and* is in the CON_IDLE state.  Any
1305                  * active sockets other than our chosen one are marked as
1306                  * CON_READY so the next thread that comes around can just bind
1307                  * to one without having to select() again.
1308                  */
1309                 begin_critical_section(S_SESSION_TABLE);
1310                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1311                         int checkfd = ptr->client_socket;
1312                         if ((checkfd != -1) && (ptr->state == CON_IDLE) ){
1313                                 if (FD_ISSET(checkfd, &readfds)) {
1314                                         ptr->input_waiting = 1;
1315                                         if (!bind_me) {
1316                                                 bind_me = ptr;  /* I choose you! */
1317                                                 bind_me->state = CON_EXECUTING;
1318                                         }
1319                                         else {
1320                                                 ptr->state = CON_READY;
1321                                         }
1322                                 } else if ((ptr->is_async) && (ptr->async_waiting) && (ptr->h_async_function)) {
1323                                         if (!bind_me) {
1324                                                 bind_me = ptr;  /* I choose you! */
1325                                                 bind_me->state = CON_EXECUTING;
1326                                         }
1327                                         else {
1328                                                 ptr->state = CON_READY;
1329                                         }
1330                                 }
1331                         }
1332                 }
1333                 end_critical_section(S_SESSION_TABLE);
1334
1335 SKIP_SELECT:
1336                 /* We're bound to a session */
1337                 pthread_mutex_lock(&ThreadCountMutex);
1338                 ++active_workers;
1339                 pthread_mutex_unlock(&ThreadCountMutex);
1340
1341                 if (bind_me != NULL) {
1342                         become_session(bind_me);
1343
1344                         if (bind_me->state == CON_STARTING) {
1345                                 bind_me->state = CON_EXECUTING;
1346                                 begin_session(bind_me);
1347                                 bind_me->h_greeting_function();
1348                         }
1349                         /* If the client has sent a command, execute it. */
1350                         if (CC->input_waiting) {
1351                                 CC->h_command_function();
1352
1353                                 while (HaveMoreLinesWaiting(CC))
1354                                        CC->h_command_function();
1355
1356                                 CC->input_waiting = 0;
1357                         }
1358
1359                         /* If there are asynchronous messages waiting and the client supports it, do those now */
1360                         if ((CC->is_async) && (CC->async_waiting) && (CC->h_async_function != NULL)) {
1361                                 CC->h_async_function();
1362                                 CC->async_waiting = 0;
1363                         }
1364
1365                         force_purge = CC->kill_me;
1366                         become_session(NULL);
1367                         bind_me->state = CON_IDLE;
1368                 }
1369
1370                 dead_session_purge(force_purge);
1371                 do_housekeeping();
1372
1373                 pthread_mutex_lock(&ThreadCountMutex);
1374                 --active_workers;
1375                 if ((active_workers + CtdlGetConfigInt("c_min_workers") < num_workers) &&
1376                     (num_workers > CtdlGetConfigInt("c_min_workers")))
1377                 {
1378                         num_workers--;
1379                         pthread_mutex_unlock(&ThreadCountMutex);
1380                         return (NULL);
1381                 }
1382                 pthread_mutex_unlock(&ThreadCountMutex);
1383         }
1384
1385         /* If control reaches this point, the server is shutting down */
1386         pthread_mutex_lock(&ThreadCountMutex);
1387         --num_workers;
1388         pthread_mutex_unlock(&ThreadCountMutex);
1389         return(NULL);
1390 }
1391
1392
1393 /*
1394  * SyslogFacility()
1395  * Translate text facility name to syslog.h defined value.
1396  */
1397 int SyslogFacility(char *name)
1398 {
1399         int i;
1400         struct
1401         {
1402                 int facility;
1403                 char *name;
1404         }   facTbl[] =
1405         {
1406                 {   LOG_KERN,   "kern"          },
1407                 {   LOG_USER,   "user"          },
1408                 {   LOG_MAIL,   "mail"          },
1409                 {   LOG_DAEMON, "daemon"        },
1410                 {   LOG_AUTH,   "auth"          },
1411                 {   LOG_SYSLOG, "syslog"        },
1412                 {   LOG_LPR,    "lpr"           },
1413                 {   LOG_NEWS,   "news"          },
1414                 {   LOG_UUCP,   "uucp"          },
1415                 {   LOG_LOCAL0, "local0"        },
1416                 {   LOG_LOCAL1, "local1"        },
1417                 {   LOG_LOCAL2, "local2"        },
1418                 {   LOG_LOCAL3, "local3"        },
1419                 {   LOG_LOCAL4, "local4"        },
1420                 {   LOG_LOCAL5, "local5"        },
1421                 {   LOG_LOCAL6, "local6"        },
1422                 {   LOG_LOCAL7, "local7"        },
1423                 {   0,            NULL          }
1424         };
1425         for(i = 0; facTbl[i].name != NULL; i++) {
1426                 if(!strcasecmp(name, facTbl[i].name))
1427                         return facTbl[i].facility;
1428         }
1429         return LOG_DAEMON;
1430 }