citadel/sysdep.c

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