luna - curl/tests/server/sockfilt.c

   1/***************************************************************************
   2 *                                  _   _ ____  _
   3 *  Project                     ___| | | |  _ \| |
   4 *                             / __| | | | |_) | |
   5 *                            | (__| |_| |  _ <| |___
   6 *                             \___|\___/|_| \_\_____|
   7 *
   8 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
   9 *
  10 * This software is licensed as described in the file COPYING, which
  11 * you should have received as part of this distribution. The terms
  12 * are also available at https://curl.se/docs/copyright.html.
  13 *
  14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
  15 * copies of the Software, and permit persons to whom the Software is
  16 * furnished to do so, under the terms of the COPYING file.
  17 *
  18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19 * KIND, either express or implied.
  20 *
  21 * SPDX-License-Identifier: curl
  22 *
  23 ***************************************************************************/
  24#include "first.h"
  25
  26/* Purpose
  27 *
  28 * 1. Accept a TCP connection on a custom port (IPv4 or IPv6), or connect
  29 *    to a given (localhost) port.
  30 *
  31 * 2. Get commands on STDIN. Pass data on to the TCP stream.
  32 *    Get data from TCP stream and pass on to STDOUT.
  33 *
  34 * This program is made to perform all the socket/stream/connection stuff for
  35 * the test suite's (perl) FTP server. Previously the perl code did all of
  36 * this by its own, but I decided to let this program do the socket layer
  37 * because of several things:
  38 *
  39 * o We want the perl code to work with rather old perl installations, thus
  40 *   we cannot use recent perl modules or features.
  41 *
  42 * o We want IPv6 support for systems that provide it, and doing optional IPv6
  43 *   support in perl seems if not impossible so at least awkward.
  44 *
  45 * o We want FTP-SSL support, which means that a connection that starts with
  46 *   plain sockets needs to be able to "go SSL" in the midst. This would also
  47 *   require some nasty perl stuff I would rather avoid.
  48 *
  49 * (Source originally based on sws.c)
  50 */
  51
  52/*
  53 * Signal handling notes for sockfilt
  54 * ----------------------------------
  55 *
  56 * This program is a single-threaded process.
  57 *
  58 * This program is intended to be highly portable and as such it must be kept
  59 * as simple as possible, due to this the only signal handling mechanisms used
  60 * will be those of ANSI C, and used only in the most basic form which is good
  61 * enough for the purpose of this program.
  62 *
  63 * For the above reason and the specific needs of this program signals SIGHUP,
  64 * SIGPIPE and SIGALRM will be ignored on systems where this can be
  65 * done.  If possible, signals SIGINT and SIGTERM will be handled by this
  66 * program as an indication to cleanup and finish execution as soon as
  67 * possible.  This will be achieved with a single signal handler
  68 * 'exit_signal_handler' for both signals.
  69 *
  70 * The 'exit_signal_handler' upon the first SIGINT or SIGTERM received signal
  71 * will just set to one the global var 'got_exit_signal' storing in global var
  72 * 'exit_signal' the signal that triggered this change.
  73 *
  74 * Nothing fancy that could introduce problems is used, the program at certain
  75 * points in its normal flow checks if var 'got_exit_signal' is set and in
  76 * case this is true it just makes its way out of loops and functions in
  77 * structured and well behaved manner to achieve proper program cleanup and
  78 * termination.
  79 *
  80 * Even with the above mechanism implemented it is worthwhile to note that
  81 * other signals might still be received, or that there might be systems on
  82 * which it is not possible to trap and ignore some of the above signals.
  83 * This implies that for increased portability and reliability the program
  84 * must be coded as if no signal was being ignored or handled at all.  Enjoy
  85 * it!
  86 */
  87
  88/* buffer is this excessively large only to be able to support things like
  89   test 1003 which tests exceedingly large server response lines */
  90#define BUFFER_SIZE 17010
  91
  92static bool verbose = FALSE;
  93static bool s_bind_only = FALSE;
  94static unsigned short server_connectport = 0; /* if non-zero,
  95                                                 we activate this mode */
  96
  97enum sockmode {
  98  PASSIVE_LISTEN,    /* as a server waiting for connections */
  99  PASSIVE_CONNECT,   /* as a server, connected to a client */
 100  ACTIVE,            /* as a client, connected to a server */
 101  ACTIVE_DISCONNECT  /* as a client, disconnected from server */
 102};
 103
 104#if defined(_WIN32) && !defined(CURL_WINDOWS_UWP)
 105/*
 106 * read-wrapper to support reading from stdin on Windows.
 107 */
 108static ssize_t read_wincon(int fd, void *buf, size_t count)
 109{
 110  HANDLE handle = NULL;
 111  DWORD mode, rcount = 0;
 112  BOOL success;
 113
 114  if(fd == fileno(stdin)) {
 115    handle = GetStdHandle(STD_INPUT_HANDLE);
 116  }
 117  else {
 118    return read(fd, buf, count);
 119  }
 120
 121  if(GetConsoleMode(handle, &mode)) {
 122    success = ReadConsole(handle, buf, curlx_uztoul(count), &rcount, NULL);
 123  }
 124  else {
 125    success = ReadFile(handle, buf, curlx_uztoul(count), &rcount, NULL);
 126  }
 127  if(success) {
 128    return rcount;
 129  }
 130
 131  errno = (int)GetLastError();
 132  return -1;
 133}
 134
 135/*
 136 * write-wrapper to support writing to stdout and stderr on Windows.
 137 */
 138static ssize_t write_wincon(int fd, const void *buf, size_t count)
 139{
 140  HANDLE handle = NULL;
 141  DWORD mode, wcount = 0;
 142  BOOL success;
 143
 144  if(fd == fileno(stdout)) {
 145    handle = GetStdHandle(STD_OUTPUT_HANDLE);
 146  }
 147  else if(fd == fileno(stderr)) {
 148    handle = GetStdHandle(STD_ERROR_HANDLE);
 149  }
 150  else {
 151    return write(fd, buf, count);
 152  }
 153
 154  if(GetConsoleMode(handle, &mode)) {
 155    success = WriteConsole(handle, buf, curlx_uztoul(count), &wcount, NULL);
 156  }
 157  else {
 158    success = WriteFile(handle, buf, curlx_uztoul(count), &wcount, NULL);
 159  }
 160  if(success) {
 161    return wcount;
 162  }
 163
 164  errno = (int)GetLastError();
 165  return -1;
 166}
 167#define SOCKFILT_read  read_wincon
 168#define SOCKFILT_write write_wincon
 169#else
 170#define SOCKFILT_read  read
 171#define SOCKFILT_write write
 172#endif
 173
 174/* On Windows, we sometimes get this for a broken pipe, seemingly
 175 * when the client just closed stdin? */
 176#define CURL_WIN32_EPIPE 109
 177
 178/*
 179 * fullread is a wrapper around the read() function. This will repeat the call
 180 * to read() until it actually has read the complete number of bytes indicated
 181 * in nbytes or it fails with a condition that cannot be handled with a simple
 182 * retry of the read call.
 183 */
 184
 185static ssize_t fullread(int filedes, void *buffer, size_t nbytes)
 186{
 187  int error;
 188  ssize_t nread = 0;
 189
 190  do {
 191    ssize_t rc = SOCKFILT_read(filedes,
 192                               (unsigned char *)buffer + nread,
 193                               nbytes - nread);
 194
 195    if(got_exit_signal) {
 196      logmsg("signalled to die");
 197      return -1;
 198    }
 199
 200    if(rc < 0) {
 201      char errbuf[STRERROR_LEN];
 202      error = errno;
 203      /* !checksrc! disable ERRNOVAR 1 */
 204      if((error == EINTR) || (error == EAGAIN))
 205        continue;
 206      if(error == CURL_WIN32_EPIPE) {
 207        logmsg("got Windows ERROR_BROKEN_PIPE on fd=%d, treating as close",
 208               filedes);
 209        return 0;
 210      }
 211      logmsg("reading from file descriptor: %d,", filedes);
 212      logmsg("unrecoverable read() failure (%d) %s",
 213             error, curlx_strerror(error, errbuf, sizeof(errbuf)));
 214      return -1;
 215    }
 216
 217    if(rc == 0) {
 218      logmsg("got 0 reading from stdin");
 219      return 0;
 220    }
 221
 222    nread += rc;
 223
 224  } while((size_t)nread < nbytes);
 225
 226  if(verbose)
 227    logmsg("read %zd bytes", nread);
 228
 229  return nread;
 230}
 231
 232/*
 233 * fullwrite is a wrapper around the write() function. This will repeat the
 234 * call to write() until it actually has written the complete number of bytes
 235 * indicated in nbytes or it fails with a condition that cannot be handled
 236 * with a simple retry of the write call.
 237 */
 238
 239static ssize_t fullwrite(int filedes, const void *buffer, size_t nbytes)
 240{
 241  int error;
 242  ssize_t nwrite = 0;
 243
 244  do {
 245    ssize_t wc = SOCKFILT_write(filedes,
 246                                (const unsigned char *)buffer + nwrite,
 247                                nbytes - nwrite);
 248
 249    if(got_exit_signal) {
 250      logmsg("signalled to die");
 251      return -1;
 252    }
 253
 254    if(wc < 0) {
 255      char errbuf[STRERROR_LEN];
 256      error = errno;
 257      /* !checksrc! disable ERRNOVAR 1 */
 258      if((error == EINTR) || (error == EAGAIN))
 259        continue;
 260      logmsg("writing to file descriptor: %d,", filedes);
 261      logmsg("unrecoverable write() failure (%d) %s",
 262             error, curlx_strerror(error, errbuf, sizeof(errbuf)));
 263      return -1;
 264    }
 265
 266    if(wc == 0) {
 267      logmsg("put 0 writing to stdout");
 268      return 0;
 269    }
 270
 271    nwrite += wc;
 272
 273  } while((size_t)nwrite < nbytes);
 274
 275  if(verbose)
 276    logmsg("wrote %zd bytes", nwrite);
 277
 278  return nwrite;
 279}
 280
 281/*
 282 * read_stdin tries to read from stdin nbytes into the given buffer. This is a
 283 * blocking function that will only return TRUE when nbytes have actually been
 284 * read or FALSE when an unrecoverable error has been detected. Failure of this
 285 * function is an indication that the sockfilt process should terminate.
 286 */
 287
 288static bool read_stdin(void *buffer, size_t nbytes)
 289{
 290  ssize_t nread = fullread(fileno(stdin), buffer, nbytes);
 291  if(nread != (ssize_t)nbytes) {
 292    logmsg("exiting...");
 293    return FALSE;
 294  }
 295  return TRUE;
 296}
 297
 298/*
 299 * write_stdout tries to write to stdio nbytes from the given buffer. This is a
 300 * blocking function that will only return TRUE when nbytes have actually been
 301 * written or FALSE when an unrecoverable error has been detected. Failure of
 302 * this function is an indication that the sockfilt process should terminate.
 303 */
 304
 305static bool write_stdout(const void *buffer, size_t nbytes)
 306{
 307  ssize_t nwrite;
 308  nwrite = fullwrite(fileno(stdout), buffer, nbytes);
 309  if(nwrite != (ssize_t)nbytes) {
 310    logmsg("exiting...");
 311    return FALSE;
 312  }
 313  return TRUE;
 314}
 315
 316static void lograw(const unsigned char *buffer, ssize_t len)
 317{
 318  char data[120];
 319  ssize_t i;
 320  const unsigned char *ptr = buffer;
 321  char *optr = data;
 322  ssize_t width = 0;
 323  int left = sizeof(data);
 324
 325  for(i = 0; i < len; i++) {
 326    switch(ptr[i]) {
 327    case '\n':
 328      snprintf(optr, left, "\\n");
 329      width += 2;
 330      optr += 2;
 331      left -= 2;
 332      break;
 333    case '\r':
 334      snprintf(optr, left, "\\r");
 335      width += 2;
 336      optr += 2;
 337      left -= 2;
 338      break;
 339    default:
 340      snprintf(optr, left, "%c", (ISGRAPH(ptr[i]) ||
 341                                  ptr[i] == 0x20) ? ptr[i] : '.');
 342      width++;
 343      optr++;
 344      left--;
 345      break;
 346    }
 347
 348    if(width > 60) {
 349      logmsg("'%s'", data);
 350      width = 0;
 351      optr = data;
 352      left = sizeof(data);
 353    }
 354  }
 355  if(width)
 356    logmsg("'%s'", data);
 357}
 358
 359/*
 360 * handle the DATA command
 361 * maxlen is the available space in buffer (input)
 362 * *buffer_len is the amount of data in the buffer (output)
 363 */
 364static bool read_data_block(unsigned char *buffer, ssize_t maxlen,
 365                            ssize_t *buffer_len)
 366{
 367  curl_off_t value;
 368  const char *endp;
 369
 370  if(!read_stdin(buffer, 5))
 371    return FALSE;
 372
 373  buffer[5] = '\0';
 374
 375  endp = (const char *)buffer;
 376  if(curlx_str_hex(&endp, &value, 0xfffff)) {
 377    logmsg("Failed to decode buffer size");
 378    return FALSE;
 379  }
 380  *buffer_len = (ssize_t)value;
 381  if(*buffer_len > maxlen) {
 382    logmsg("Buffer size (%zd bytes) too small for data size error "
 383           "(%zd bytes)", maxlen, *buffer_len);
 384    return FALSE;
 385  }
 386  logmsg("> %zd bytes data, server => client", *buffer_len);
 387
 388  if(!read_stdin(buffer, *buffer_len))
 389    return FALSE;
 390
 391  lograw(buffer, *buffer_len);
 392
 393  return TRUE;
 394}
 395
 396#if defined(USE_WINSOCK) && !defined(CURL_WINDOWS_UWP)
 397/*
 398 * Winsock select() does not support standard file descriptors,
 399 * it can only check SOCKETs. The following function is an attempt
 400 * to re-create a select() function with support for other handle types.
 401 *
 402 * select() function with support for Winsock2 sockets and all
 403 * other handle types supported by WaitForMultipleObjectsEx() as
 404 * well as disk files, anonymous and names pipes, and character input.
 405 *
 406 * https://learn.microsoft.com/windows/win32/api/synchapi/nf-synchapi-waitformultipleobjectsex
 407 * https://learn.microsoft.com/windows/win32/api/winsock2/nf-winsock2-wsaenumnetworkevents
 408 */
 409struct select_ws_wait_data {
 410  HANDLE handle; /* actual handle to wait for during select */
 411  HANDLE signal; /* internal event to signal handle trigger */
 412  HANDLE abort;  /* internal event to abort waiting threads */
 413};
 414static DWORD WINAPI select_ws_wait_thread(void *lpParameter)
 415{
 416  struct select_ws_wait_data *data;
 417  HANDLE signal, handle, handles[2];
 418  INPUT_RECORD inputrecord;
 419  LARGE_INTEGER size, pos;
 420  DWORD type, length, ret;
 421
 422  /* retrieve handles from internal structure */
 423  data = (struct select_ws_wait_data *)lpParameter;
 424  if(data) {
 425    handle = data->handle;
 426    handles[0] = data->abort;
 427    handles[1] = handle;
 428    signal = data->signal;
 429    free(data);
 430  }
 431  else
 432    return (DWORD)-1;
 433
 434  /* retrieve the type of file to wait on */
 435  type = GetFileType(handle);
 436  switch(type) {
 437  case FILE_TYPE_DISK:
 438    /* The handle represents a file on disk, this means:
 439     * - WaitForMultipleObjectsEx will always be signalled for it.
 440     * - comparison of current position in file and total size of
 441     *   the file can be used to check if we reached the end yet.
 442     *
 443     * Approach: Loop till either the internal event is signalled
 444     *           or if the end of the file has already been reached.
 445     */
 446    while(WaitForMultipleObjectsEx(1, handles, FALSE, 0, FALSE)
 447          == WAIT_TIMEOUT) {
 448      /* get total size of file */
 449      length = 0;
 450      size.QuadPart = 0;
 451      size.LowPart = GetFileSize(handle, &length);
 452      if((size.LowPart != INVALID_FILE_SIZE) ||
 453         (GetLastError() == NO_ERROR)) {
 454        size.HighPart = (LONG)length;
 455        /* get the current position within the file */
 456        pos.QuadPart = 0;
 457        pos.LowPart = SetFilePointer(handle, 0, &pos.HighPart, FILE_CURRENT);
 458        if((pos.LowPart != INVALID_SET_FILE_POINTER) ||
 459           (GetLastError() == NO_ERROR)) {
 460          /* compare position with size, abort if not equal */
 461          if(size.QuadPart == pos.QuadPart) {
 462            /* sleep and continue waiting */
 463            SleepEx(0, FALSE);
 464            continue;
 465          }
 466        }
 467      }
 468      /* there is some data available, stop waiting */
 469      logmsg("[select_ws_wait_thread] data available, DISK: %p", handle);
 470      SetEvent(signal);
 471    }
 472    break;
 473
 474  case FILE_TYPE_CHAR:
 475    /* The handle represents a character input, this means:
 476     * - WaitForMultipleObjectsEx will be signalled on any kind of input,
 477     *   including mouse and window size events we do not care about.
 478     *
 479     * Approach: Loop till either the internal event is signalled
 480     *           or we get signalled for an actual key-event.
 481     */
 482    while(WaitForMultipleObjectsEx(2, handles, FALSE, INFINITE, FALSE)
 483          == WAIT_OBJECT_0 + 1) {
 484      /* check if this is an actual console handle */
 485      if(GetConsoleMode(handle, &ret)) {
 486        /* retrieve an event from the console buffer */
 487        length = 0;
 488        if(PeekConsoleInput(handle, &inputrecord, 1, &length)) {
 489          /* check if the event is not an actual key-event */
 490          if(length == 1 && inputrecord.EventType != KEY_EVENT) {
 491            /* purge the non-key-event and continue waiting */
 492            ReadConsoleInput(handle, &inputrecord, 1, &length);
 493            continue;
 494          }
 495        }
 496      }
 497      /* there is some data available, stop waiting */
 498      logmsg("[select_ws_wait_thread] data available, CHAR: %p", handle);
 499      SetEvent(signal);
 500    }
 501    break;
 502
 503  case FILE_TYPE_PIPE:
 504    /* The handle represents an anonymous or named pipe, this means:
 505     * - WaitForMultipleObjectsEx will always be signalled for it.
 506     * - peek into the pipe and retrieve the amount of data available.
 507     *
 508     * Approach: Loop till either the internal event is signalled
 509     *           or there is data in the pipe available for reading.
 510     */
 511    while(WaitForMultipleObjectsEx(1, handles, FALSE, 0, FALSE)
 512          == WAIT_TIMEOUT) {
 513      /* peek into the pipe and retrieve the amount of data available */
 514      length = 0;
 515      if(PeekNamedPipe(handle, NULL, 0, NULL, &length, NULL)) {
 516        /* if there is no data available, sleep and continue waiting */
 517        if(length == 0) {
 518          SleepEx(0, FALSE);
 519          continue;
 520        }
 521        else {
 522          logmsg("[select_ws_wait_thread] PeekNamedPipe len: %lu", length);
 523        }
 524      }
 525      else {
 526        /* if the pipe has NOT been closed, sleep and continue waiting */
 527        ret = GetLastError();
 528        if(ret != ERROR_BROKEN_PIPE) {
 529          char buffer[WINAPI_ERROR_LEN];
 530          curlx_winapi_strerror(ret, buffer, sizeof(buffer));
 531          logmsg("[select_ws_wait_thread] PeekNamedPipe error: (0x%08lx) - %s",
 532                 ret, buffer);
 533          if(ret == ERROR_NOT_SUPPORTED)  /* avoid potential endless loop */
 534             break;
 535          SleepEx(0, FALSE);
 536          continue;
 537        }
 538        else {
 539          logmsg("[select_ws_wait_thread] pipe closed, PIPE: %p", handle);
 540        }
 541      }
 542      /* there is some data available, stop waiting */
 543      logmsg("[select_ws_wait_thread] data available, PIPE: %p", handle);
 544      SetEvent(signal);
 545    }
 546    break;
 547
 548  default:
 549    /* The handle has an unknown type, try to wait on it */
 550    if(WaitForMultipleObjectsEx(2, handles, FALSE, INFINITE, FALSE)
 551       == WAIT_OBJECT_0 + 1) {
 552      logmsg("[select_ws_wait_thread] data available, HANDLE: %p", handle);
 553      SetEvent(signal);
 554    }
 555    break;
 556  }
 557
 558  return 0;
 559}
 560
 561static HANDLE select_ws_wait(HANDLE handle, HANDLE signal, HANDLE abort)
 562{
 563  struct select_ws_wait_data *data;
 564
 565  /* allocate internal waiting data structure */
 566  data = malloc(sizeof(struct select_ws_wait_data));
 567  if(data) {
 568    HANDLE thread;
 569
 570    data->handle = handle;
 571    data->signal = signal;
 572    data->abort = abort;
 573
 574    /* launch waiting thread */
 575    thread = CreateThread(NULL, 0, &select_ws_wait_thread, data, 0, NULL);
 576
 577    /* free data if thread failed to launch */
 578    if(!thread) {
 579      free(data);
 580    }
 581    return thread;
 582  }
 583  return NULL;
 584}
 585
 586struct select_ws_data {
 587  int fd;                /* provided file descriptor  (indexed by nfd) */
 588  long wsastate;         /* internal preselect state  (indexed by nfd) */
 589  curl_socket_t wsasock; /* internal socket handle    (indexed by nws) */
 590  WSAEVENT wsaevent;     /* internal select event     (indexed by nws) */
 591  HANDLE signal;         /* internal thread signal    (indexed by nth) */
 592  HANDLE thread;         /* internal thread handle    (indexed by nth) */
 593};
 594
 595static int select_ws(int nfds, fd_set *readfds, fd_set *writefds,
 596                     fd_set *exceptfds, struct timeval *tv)
 597{
 598  DWORD timeout_ms, wait, nfd, nth, nws, i;
 599  HANDLE abort, signal, handle, *handles;
 600  struct select_ws_data *data;
 601  WSANETWORKEVENTS wsaevents;
 602  curl_socket_t wsasock;
 603  int ret, fd;
 604
 605  /* check if the input value is valid */
 606  if(nfds < 0) {
 607    SET_SOCKERRNO(SOCKEINVAL);
 608    return -1;
 609  }
 610
 611  /* convert struct timeval to milliseconds */
 612  if(tv) {
 613    timeout_ms = (DWORD)curlx_tvtoms(tv);
 614  }
 615  else {
 616    timeout_ms = INFINITE;
 617  }
 618
 619  /* check if we got descriptors, sleep in case we got none */
 620  if(!nfds) {
 621    SleepEx(timeout_ms, FALSE);
 622    return 0;
 623  }
 624
 625  /* create internal event to abort waiting threads */
 626  abort = CreateEvent(NULL, TRUE, FALSE, NULL);
 627  if(!abort) {
 628    SET_SOCKERRNO(SOCKENOMEM);
 629    return -1;
 630  }
 631
 632  /* allocate internal array for the internal data */
 633  data = calloc(nfds, sizeof(struct select_ws_data));
 634  if(!data) {
 635    CloseHandle(abort);
 636    SET_SOCKERRNO(SOCKENOMEM);
 637    return -1;
 638  }
 639
 640  /* allocate internal array for the internal event handles */
 641  handles = calloc(nfds + 1, sizeof(HANDLE));
 642  if(!handles) {
 643    CloseHandle(abort);
 644    free(data);
 645    SET_SOCKERRNO(SOCKENOMEM);
 646    return -1;
 647  }
 648
 649  /* loop over the handles in the input descriptor sets */
 650  nfd = 0; /* number of handled file descriptors */
 651  nth = 0; /* number of internal waiting threads */
 652  nws = 0; /* number of handled Winsock sockets */
 653  for(fd = 0; fd < nfds; fd++) {
 654    fd_set readsock, writesock, exceptsock;
 655
 656    wsasock = (curl_socket_t)fd;
 657    wsaevents.lNetworkEvents = 0;
 658    handles[nfd] = 0;
 659
 660    FD_ZERO(&readsock);
 661    FD_ZERO(&writesock);
 662    FD_ZERO(&exceptsock);
 663
 664    if(FD_ISSET(wsasock, readfds)) {
 665      FD_SET(wsasock, &readsock);
 666      wsaevents.lNetworkEvents |= FD_READ | FD_ACCEPT | FD_CLOSE;
 667    }
 668
 669    if(FD_ISSET(wsasock, writefds)) {
 670      FD_SET(wsasock, &writesock);
 671      wsaevents.lNetworkEvents |= FD_WRITE | FD_CONNECT | FD_CLOSE;
 672    }
 673
 674    if(FD_ISSET(wsasock, exceptfds)) {
 675      FD_SET(wsasock, &exceptsock);
 676      wsaevents.lNetworkEvents |= FD_OOB;
 677    }
 678
 679    /* only wait for events for which we actually care */
 680    if(wsaevents.lNetworkEvents) {
 681      data[nfd].fd = fd;
 682      if(fd == fileno(stdin)) {
 683        signal = CreateEvent(NULL, TRUE, FALSE, NULL);
 684        if(signal) {
 685          handle = GetStdHandle(STD_INPUT_HANDLE);
 686          handle = select_ws_wait(handle, signal, abort);
 687          if(handle) {
 688            handles[nfd] = signal;
 689            data[nth].signal = signal;
 690            data[nth].thread = handle;
 691            nfd++;
 692            nth++;
 693          }
 694          else {
 695            CloseHandle(signal);
 696          }
 697        }
 698      }
 699      else if(fd == fileno(stdout)) {
 700        handles[nfd] = GetStdHandle(STD_OUTPUT_HANDLE);
 701        nfd++;
 702      }
 703      else if(fd == fileno(stderr)) {
 704        handles[nfd] = GetStdHandle(STD_ERROR_HANDLE);
 705        nfd++;
 706      }
 707      else {
 708        WSAEVENT wsaevent;
 709        wsaevent = WSACreateEvent();
 710        if(wsaevent != WSA_INVALID_EVENT) {
 711          if(wsaevents.lNetworkEvents & FD_WRITE) {
 712            swrite(wsasock, NULL, 0); /* reset FD_WRITE */
 713          }
 714          if(WSAEventSelect(wsasock, wsaevent, wsaevents.lNetworkEvents)
 715             == 0) {
 716            handles[nfd] = (HANDLE)wsaevent;
 717            data[nws].wsasock = wsasock;
 718            data[nws].wsaevent = wsaevent;
 719            data[nfd].wsastate = 0;
 720            if(tv) {
 721              tv->tv_sec = 0;
 722              tv->tv_usec = 0;
 723            }
 724            /* check if the socket is already ready */
 725            if(select(fd + 1, &readsock, &writesock, &exceptsock, tv) == 1) {
 726              logmsg("[select_ws] socket %d is ready", fd);
 727              WSASetEvent(wsaevent);
 728              if(FD_ISSET(wsasock, &readsock))
 729                data[nfd].wsastate |= FD_READ;
 730              if(FD_ISSET(wsasock, &writesock))
 731                data[nfd].wsastate |= FD_WRITE;
 732              if(FD_ISSET(wsasock, &exceptsock))
 733                data[nfd].wsastate |= FD_OOB;
 734            }
 735            nfd++;
 736            nws++;
 737          }
 738          else {
 739            WSACloseEvent(wsaevent);
 740            signal = CreateEvent(NULL, TRUE, FALSE, NULL);
 741            if(signal) {
 742              handle = (HANDLE)wsasock;
 743              handle = select_ws_wait(handle, signal, abort);
 744              if(handle) {
 745                handles[nfd] = signal;
 746                data[nth].signal = signal;
 747                data[nth].thread = handle;
 748                nfd++;
 749                nth++;
 750              }
 751              else {
 752                CloseHandle(signal);
 753              }
 754            }
 755          }
 756        }
 757      }
 758    }
 759  }
 760
 761  /* wait on the number of handles */
 762  wait = nfd;
 763
 764  /* make sure we stop waiting on exit signal event */
 765  if(exit_event) {
 766    /* we allocated handles nfds + 1 for this */
 767    handles[nfd] = exit_event;
 768    wait += 1;
 769  }
 770
 771  /* wait for one of the internal handles to trigger */
 772  wait = WaitForMultipleObjectsEx(wait, handles, FALSE, timeout_ms, FALSE);
 773
 774  /* signal the abort event handle and join the other waiting threads */
 775  SetEvent(abort);
 776  for(i = 0; i < nth; i++) {
 777    WaitForSingleObjectEx(data[i].thread, INFINITE, FALSE);
 778    CloseHandle(data[i].thread);
 779  }
 780
 781  /* loop over the internal handles returned in the descriptors */
 782  ret = 0; /* number of ready file descriptors */
 783  for(i = 0; i < nfd; i++) {
 784    fd = data[i].fd;
 785    handle = handles[i];
 786    wsasock = (curl_socket_t)fd;
 787
 788    /* check if the current internal handle was triggered */
 789    if(wait != WAIT_FAILED && (wait - WAIT_OBJECT_0) <= i &&
 790       WaitForSingleObjectEx(handle, 0, FALSE) == WAIT_OBJECT_0) {
 791      /* first handle stdin, stdout and stderr */
 792      if(fd == fileno(stdin)) {
 793        /* stdin is never ready for write or exceptional */
 794        FD_CLR(wsasock, writefds);
 795        FD_CLR(wsasock, exceptfds);
 796      }
 797      else if(fd == fileno(stdout) || fd == fileno(stderr)) {
 798        /* stdout and stderr are never ready for read or exceptional */
 799        FD_CLR(wsasock, readfds);
 800        FD_CLR(wsasock, exceptfds);
 801      }
 802      else {
 803        /* try to handle the event with the Winsock2 functions */
 804        wsaevents.lNetworkEvents = 0;
 805        if(WSAEnumNetworkEvents(wsasock, handle, &wsaevents) == 0) {
 806          /* merge result from pre-check using select */
 807          wsaevents.lNetworkEvents |= data[i].wsastate;
 808
 809          /* remove from descriptor set if not ready for read/accept/close */
 810          if(!(wsaevents.lNetworkEvents & (FD_READ | FD_ACCEPT | FD_CLOSE)))
 811            FD_CLR(wsasock, readfds);
 812
 813          /* remove from descriptor set if not ready for write/connect */
 814          if(!(wsaevents.lNetworkEvents & (FD_WRITE | FD_CONNECT | FD_CLOSE)))
 815            FD_CLR(wsasock, writefds);
 816
 817          /* remove from descriptor set if not exceptional */
 818          if(!(wsaevents.lNetworkEvents & FD_OOB))
 819            FD_CLR(wsasock, exceptfds);
 820        }
 821      }
 822
 823      /* check if the event has not been filtered using specific tests */
 824      if(FD_ISSET(wsasock, readfds) || FD_ISSET(wsasock, writefds) ||
 825         FD_ISSET(wsasock, exceptfds)) {
 826        ret++;
 827      }
 828    }
 829    else {
 830      /* remove from all descriptor sets since this handle did not trigger */
 831      FD_CLR(wsasock, readfds);
 832      FD_CLR(wsasock, writefds);
 833      FD_CLR(wsasock, exceptfds);
 834    }
 835  }
 836
 837  for(fd = 0; fd < nfds; fd++) {
 838    if(FD_ISSET(fd, readfds))
 839      logmsg("[select_ws] %d is readable", fd);
 840    if(FD_ISSET(fd, writefds))
 841      logmsg("[select_ws] %d is writable", fd);
 842    if(FD_ISSET(fd, exceptfds))
 843      logmsg("[select_ws] %d is exceptional", fd);
 844  }
 845
 846  for(i = 0; i < nws; i++) {
 847    WSAEventSelect(data[i].wsasock, NULL, 0);
 848    WSACloseEvent(data[i].wsaevent);
 849  }
 850
 851  for(i = 0; i < nth; i++) {
 852    CloseHandle(data[i].signal);
 853  }
 854  CloseHandle(abort);
 855
 856  free(handles);
 857  free(data);
 858
 859  return ret;
 860}
 861#define SOCKFILT_select(a, b, c, d, e) select_ws(a, b, c, d, e)
 862#else
 863#define SOCKFILT_select(a, b, c, d, e) select(a, b, c, d, e)
 864#endif /* USE_WINSOCK */
 865
 866/* Perform the disconnect handshake with sockfilt
 867 * This involves waiting for the disconnect acknowledgment after the DISC
 868 * command, while throwing away anything else that might come in before
 869 * that.
 870 */
 871static bool disc_handshake(void)
 872{
 873  if(!write_stdout("DISC\n", 5))
 874    return FALSE;
 875
 876  do {
 877    unsigned char buffer[BUFFER_SIZE];
 878    ssize_t buffer_len;
 879    if(!read_stdin(buffer, 5))
 880      return FALSE;
 881    logmsg("Received %c%c%c%c (on stdin)",
 882           buffer[0], buffer[1], buffer[2], buffer[3]);
 883
 884    if(!memcmp("ACKD", buffer, 4)) {
 885      /* got the ack we were waiting for */
 886      break;
 887    }
 888    else if(!memcmp("DISC", buffer, 4)) {
 889      logmsg("Crikey! Client also wants to disconnect");
 890      if(!write_stdout("ACKD\n", 5))
 891        return FALSE;
 892    }
 893    else if(!memcmp("DATA", buffer, 4)) {
 894      /* We must read more data to stay in sync */
 895      logmsg("Throwing away data bytes");
 896      if(!read_data_block(buffer, sizeof(buffer), &buffer_len))
 897        return FALSE;
 898    }
 899    else if(!memcmp("QUIT", buffer, 4)) {
 900      /* just die */
 901      logmsg("quits");
 902      return FALSE;
 903    }
 904    else {
 905      logmsg("Unexpected message error; aborting");
 906      /*
 907       * The only other messages that could occur here are PING and PORT,
 908       * and both of them occur at the start of a test when nothing should be
 909       * trying to DISC. Therefore, we should not ever get here, but if we
 910       * do, it is probably due to some kind of unclean shutdown situation so
 911       * us shutting down is what we probably ought to be doing, anyway.
 912       */
 913      return FALSE;
 914    }
 915  } while(TRUE);
 916  return TRUE;
 917}
 918
 919/*
 920  sockfdp is a pointer to an established stream or CURL_SOCKET_BAD
 921
 922  if sockfd is CURL_SOCKET_BAD, listendfd is a listening socket we must
 923  accept()
 924*/
 925static bool juggle(curl_socket_t *sockfdp,
 926                   curl_socket_t listenfd,
 927                   enum sockmode *mode)
 928{
 929  struct timeval timeout;
 930  fd_set fds_read;
 931  fd_set fds_write;
 932  fd_set fds_err;
 933  curl_socket_t sockfd = CURL_SOCKET_BAD;
 934  int maxfd = -99;
 935  ssize_t rc;
 936  int error = 0;
 937  char errbuf[STRERROR_LEN];
 938
 939  unsigned char buffer[BUFFER_SIZE];
 940  char data[16];
 941
 942  if(got_exit_signal) {
 943    logmsg("signalled to die, exiting...");
 944    return FALSE;
 945  }
 946
 947#ifdef HAVE_GETPPID
 948  /* As a last resort, quit if sockfilt process becomes orphan. Just in case
 949     parent ftpserver process has died without killing its sockfilt children */
 950  if(getppid() <= 1) {
 951    logmsg("process becomes orphan, exiting");
 952    return FALSE;
 953  }
 954#endif
 955
 956  timeout.tv_sec = 120;
 957  timeout.tv_usec = 0;
 958
 959  FD_ZERO(&fds_read);
 960  FD_ZERO(&fds_write);
 961  FD_ZERO(&fds_err);
 962
 963  FD_SET((curl_socket_t)fileno(stdin), &fds_read);
 964
 965  switch(*mode) {
 966
 967  case PASSIVE_LISTEN:
 968
 969    /* server mode */
 970    sockfd = listenfd;
 971    /* there is always a socket to wait for */
 972    FD_SET(sockfd, &fds_read);
 973    maxfd = (int)sockfd;
 974    break;
 975
 976  case PASSIVE_CONNECT:
 977
 978    sockfd = *sockfdp;
 979    if(sockfd == CURL_SOCKET_BAD) {
 980      /* eeek, we are supposedly connected and then this cannot be -1 ! */
 981      logmsg("socket is -1! on %s:%d", __FILE__, __LINE__);
 982      maxfd = 0; /* stdin */
 983    }
 984    else {
 985      /* there is always a socket to wait for */
 986      FD_SET(sockfd, &fds_read);
 987      maxfd = (int)sockfd;
 988    }
 989    break;
 990
 991  case ACTIVE:
 992
 993    sockfd = *sockfdp;
 994    /* sockfd turns CURL_SOCKET_BAD when our connection has been closed */
 995    if(sockfd != CURL_SOCKET_BAD) {
 996      FD_SET(sockfd, &fds_read);
 997      maxfd = (int)sockfd;
 998    }
 999    else {
1000      logmsg("No socket to read on");
1001      maxfd = 0;
1002    }
1003    break;
1004
1005  case ACTIVE_DISCONNECT:
1006
1007    logmsg("disconnected, no socket to read on");
1008    maxfd = 0;
1009    sockfd = CURL_SOCKET_BAD;
1010    break;
1011
1012  } /* switch(*mode) */
1013
1014  do {
1015    /* select() blocking behavior call on blocking descriptors please */
1016    rc = SOCKFILT_select(maxfd + 1, &fds_read, &fds_write, &fds_err, &timeout);
1017
1018    if(got_exit_signal) {
1019      logmsg("signalled to die, exiting...");
1020      return FALSE;
1021    }
1022  } while((rc == -1) && ((error = SOCKERRNO) == SOCKEINTR));
1023
1024  if(rc < 0) {
1025    logmsg("select() failed with error (%d) %s",
1026           error, curlx_strerror(error, errbuf, sizeof(errbuf)));
1027    return FALSE;
1028  }
1029
1030  if(rc == 0)
1031    /* timeout */
1032    return TRUE;
1033
1034  if(FD_ISSET(fileno(stdin), &fds_read)) {
1035    ssize_t buffer_len;
1036    /* read from stdin, commands/data to be dealt with and possibly passed on
1037       to the socket
1038
1039       protocol:
1040
1041       4 letter command + LF [mandatory]
1042
1043       4-digit hexadecimal data length + LF [if the command takes data]
1044       data                       [the data being as long as set above]
1045
1046       Commands:
1047
1048       DATA - plain pass-through data
1049    */
1050
1051    if(!read_stdin(buffer, 5))
1052      return FALSE;
1053
1054    logmsg("Received %c%c%c%c (on stdin)",
1055           buffer[0], buffer[1], buffer[2], buffer[3]);
1056
1057    if(!memcmp("PING", buffer, 4)) {
1058      /* send reply on stdout, just proving we are alive */
1059      if(!write_stdout("PONG\n", 5))
1060        return FALSE;
1061    }
1062
1063    else if(!memcmp("PORT", buffer, 4)) {
1064      /* Question asking us what PORT number we are listening to.
1065         Replies to PORT with "IPv[num]/[port]" */
1066      snprintf((char *)buffer, sizeof(buffer), "%s/%hu\n",
1067               ipv_inuse, server_port);
1068      buffer_len = (ssize_t)strlen((const char *)buffer);
1069      snprintf(data, sizeof(data), "PORT\n%04x\n", (unsigned int)buffer_len);
1070      if(!write_stdout(data, 10))
1071        return FALSE;
1072      if(!write_stdout(buffer, buffer_len))
1073        return FALSE;
1074    }
1075    else if(!memcmp("QUIT", buffer, 4)) {
1076      /* just die */
1077      logmsg("quits");
1078      return FALSE;
1079    }
1080    else if(!memcmp("DATA", buffer, 4)) {
1081      /* data IN => data OUT */
1082      if(!read_data_block(buffer, sizeof(buffer), &buffer_len))
1083        return FALSE;
1084
1085      if(buffer_len < 0)
1086        return FALSE;
1087
1088      if(*mode == PASSIVE_LISTEN) {
1089        logmsg("*** We are disconnected!");
1090        if(!disc_handshake())
1091          return FALSE;
1092      }
1093      else {
1094        /* send away on the socket */
1095        ssize_t bytes_written = swrite(sockfd, buffer, buffer_len);
1096        if(bytes_written != buffer_len) {
1097          logmsg("Not all data was sent. Bytes to send: %zd sent: %zd",
1098                 buffer_len, bytes_written);
1099        }
1100      }
1101    }
1102    else if(!memcmp("DISC", buffer, 4)) {
1103      /* disconnect! */
1104      if(!write_stdout("ACKD\n", 5))
1105        return FALSE;
1106      if(sockfd != CURL_SOCKET_BAD) {
1107        logmsg("====> Client forcibly disconnected");
1108        sclose(sockfd);
1109        *sockfdp = CURL_SOCKET_BAD;
1110        if(*mode == PASSIVE_CONNECT)
1111          *mode = PASSIVE_LISTEN;
1112        else
1113          *mode = ACTIVE_DISCONNECT;
1114      }
1115      else
1116        logmsg("attempt to close already dead connection");
1117      return TRUE;
1118    }
1119  }
1120
1121  if((sockfd != CURL_SOCKET_BAD) && (FD_ISSET(sockfd, &fds_read))) {
1122    ssize_t nread_socket;
1123    if(*mode == PASSIVE_LISTEN) {
1124      /* there is no stream set up yet, this is an indication that there is a
1125         client connecting. */
1126      curl_socket_t newfd = accept(sockfd, NULL, NULL);
1127      if(newfd == CURL_SOCKET_BAD) {
1128        error = SOCKERRNO;
1129        logmsg("accept() failed with error (%d) %s",
1130               error, curlx_strerror(error, errbuf, sizeof(errbuf)));
1131      }
1132      else {
1133        logmsg("====> Client connect");
1134        if(!write_stdout("CNCT\n", 5))
1135          return FALSE;
1136        *sockfdp = newfd; /* store the new socket */
1137        *mode = PASSIVE_CONNECT; /* we have connected */
1138      }
1139      return TRUE;
1140    }
1141
1142    /* read from socket, pass on data to stdout */
1143    nread_socket = sread(sockfd, buffer, sizeof(buffer));
1144
1145    if(nread_socket > 0) {
1146      snprintf(data, sizeof(data), "DATA\n%04x\n", (unsigned int)nread_socket);
1147      if(!write_stdout(data, 10))
1148        return FALSE;
1149      if(!write_stdout(buffer, nread_socket))
1150        return FALSE;
1151
1152      logmsg("< %zd bytes data, client => server", nread_socket);
1153      lograw(buffer, nread_socket);
1154    }
1155
1156    if(nread_socket <= 0) {
1157      logmsg("====> Client disconnect");
1158      if(!disc_handshake())
1159        return FALSE;
1160      sclose(sockfd);
1161      *sockfdp = CURL_SOCKET_BAD;
1162      if(*mode == PASSIVE_CONNECT)
1163        *mode = PASSIVE_LISTEN;
1164      else
1165        *mode = ACTIVE_DISCONNECT;
1166      return TRUE;
1167    }
1168  }
1169
1170  return TRUE;
1171}
1172
1173static int test_sockfilt(int argc, const char *argv[])
1174{
1175  srvr_sockaddr_union_t me;
1176  curl_socket_t sock = CURL_SOCKET_BAD;
1177  curl_socket_t msgsock = CURL_SOCKET_BAD;
1178  int wrotepidfile = 0;
1179  int wroteportfile = 0;
1180  bool juggle_again;
1181  int rc;
1182  int error;
1183  char errbuf[STRERROR_LEN];
1184  int arg = 1;
1185  enum sockmode mode = PASSIVE_LISTEN; /* default */
1186  const char *addr = NULL;
1187
1188  pidname = ".sockfilt.pid";
1189  serverlogfile = "log/sockfilt.log";
1190  server_port = 8999;
1191
1192  while(argc > arg) {
1193    const char *opt;
1194    curl_off_t num;
1195    if(!strcmp("--version", argv[arg])) {
1196      printf("sockfilt IPv4%s\n",
1197#ifdef USE_IPV6
1198             "/IPv6"
1199#else
1200             ""
1201#endif
1202      );
1203      return 0;
1204    }
1205    else if(!strcmp("--verbose", argv[arg])) {
1206      verbose = TRUE;
1207      arg++;
1208    }
1209    else if(!strcmp("--pidfile", argv[arg])) {
1210      arg++;
1211      if(argc > arg)
1212        pidname = argv[arg++];
1213    }
1214    else if(!strcmp("--portfile", argv[arg])) {
1215      arg++;
1216      if(argc > arg)
1217        portname = argv[arg++];
1218    }
1219    else if(!strcmp("--logfile", argv[arg])) {
1220      arg++;
1221      if(argc > arg)
1222        serverlogfile = argv[arg++];
1223    }
1224    else if(!strcmp("--ipv6", argv[arg])) {
1225#ifdef USE_IPV6
1226      socket_domain = AF_INET6;
1227      ipv_inuse = "IPv6";
1228#endif
1229      arg++;
1230    }
1231    else if(!strcmp("--ipv4", argv[arg])) {
1232      /* for completeness, we support this option as well */
1233#ifdef USE_IPV6
1234      socket_domain = AF_INET;
1235      ipv_inuse = "IPv4";
1236#endif
1237      arg++;
1238    }
1239    else if(!strcmp("--bindonly", argv[arg])) {
1240      s_bind_only = TRUE;
1241      arg++;
1242    }
1243    else if(!strcmp("--port", argv[arg])) {
1244      arg++;
1245      if(argc > arg) {
1246        opt = argv[arg];
1247        if(!curlx_str_number(&opt, &num, 0xffff))
1248          server_port = (unsigned short)num;
1249        arg++;
1250      }
1251    }
1252    else if(!strcmp("--connect", argv[arg])) {
1253      /* Asked to actively connect to the specified local port instead of
1254         doing a passive server-style listening. */
1255      arg++;
1256      if(argc > arg) {
1257        opt = argv[arg];
1258        if(curlx_str_number(&opt, &num, 0xffff)) {
1259          fprintf(stderr, "sockfilt: invalid --connect argument (%s)\n",
1260                  argv[arg]);
1261          return 0;
1262        }
1263        server_connectport = (unsigned short)num;
1264        arg++;
1265      }
1266    }
1267    else if(!strcmp("--addr", argv[arg])) {
1268      /* Set an IP address to use with --connect; otherwise use localhost */
1269      arg++;
1270      if(argc > arg) {
1271        addr = argv[arg];
1272        arg++;
1273      }
1274    }
1275    else {
1276      puts("Usage: sockfilt [option]\n"
1277           " --version\n"
1278           " --verbose\n"
1279           " --logfile [file]\n"
1280           " --pidfile [file]\n"
1281           " --portfile [file]\n"
1282           " --ipv4\n"
1283           " --ipv6\n"
1284           " --bindonly\n"
1285           " --port [port]\n"
1286           " --connect [port]\n"
1287           " --addr [address]");
1288      return 0;
1289    }
1290  }
1291
1292  CURL_BINMODE(stdin);
1293  CURL_BINMODE(stdout);
1294  CURL_BINMODE(stderr);
1295
1296  install_signal_handlers(false);
1297
1298  sock = socket(socket_domain, SOCK_STREAM, 0);
1299
1300  if(sock == CURL_SOCKET_BAD) {
1301    error = SOCKERRNO;
1302    logmsg("Error creating socket (%d) %s",
1303           error, curlx_strerror(error, errbuf, sizeof(errbuf)));
1304    write_stdout("FAIL\n", 5);
1305    goto sockfilt_cleanup;
1306  }
1307
1308  if(server_connectport) {
1309    /* Active mode, we should connect to the given port number */
1310    mode = ACTIVE;
1311    switch(socket_domain) {
1312    case AF_INET:
1313      memset(&me.sa4, 0, sizeof(me.sa4));
1314      me.sa4.sin_family = AF_INET;
1315      me.sa4.sin_port = htons(server_connectport);
1316      me.sa4.sin_addr.s_addr = INADDR_ANY;
1317      if(!addr)
1318        addr = "127.0.0.1";
1319      curlx_inet_pton(AF_INET, addr, &me.sa4.sin_addr);
1320
1321      rc = connect(sock, &me.sa, sizeof(me.sa4));
1322      break;
1323#ifdef USE_IPV6
1324    case AF_INET6:
1325      memset(&me.sa6, 0, sizeof(me.sa6));
1326      me.sa6.sin6_family = AF_INET6;
1327      me.sa6.sin6_port = htons(server_connectport);
1328      if(!addr)
1329        addr = "::1";
1330      curlx_inet_pton(AF_INET6, addr, &me.sa6.sin6_addr);
1331
1332      rc = connect(sock, &me.sa, sizeof(me.sa6));
1333      break;
1334#endif /* USE_IPV6 */
1335    default:
1336      rc = 1;
1337    }
1338    if(rc) {
1339      error = SOCKERRNO;
1340      logmsg("Error connecting to port %hu (%d) %s", server_connectport,
1341             error, curlx_strerror(error, errbuf, sizeof(errbuf)));
1342      write_stdout("FAIL\n", 5);
1343      goto sockfilt_cleanup;
1344    }
1345    logmsg("====> Client connect");
1346    msgsock = sock; /* use this as stream */
1347  }
1348  else {
1349    /* passive daemon style */
1350    sock = sockdaemon(sock, &server_port, NULL, s_bind_only);
1351    if(sock == CURL_SOCKET_BAD) {
1352      write_stdout("FAIL\n", 5);
1353      goto sockfilt_cleanup;
1354    }
1355    msgsock = CURL_SOCKET_BAD; /* no stream socket yet */
1356  }
1357
1358  logmsg("Running %s version", ipv_inuse);
1359
1360  if(server_connectport)
1361    logmsg("Connected to port %hu", server_connectport);
1362  else if(s_bind_only)
1363    logmsg("Bound without listening on port %hu", server_port);
1364  else
1365    logmsg("Listening on port %hu", server_port);
1366
1367  wrotepidfile = write_pidfile(pidname);
1368  if(!wrotepidfile) {
1369    write_stdout("FAIL\n", 5);
1370    goto sockfilt_cleanup;
1371  }
1372  if(portname) {
1373    wroteportfile = write_portfile(portname, server_port);
1374    if(!wroteportfile) {
1375      write_stdout("FAIL\n", 5);
1376      goto sockfilt_cleanup;
1377    }
1378  }
1379
1380  do {
1381    juggle_again = juggle(&msgsock, sock, &mode);
1382  } while(juggle_again);
1383
1384sockfilt_cleanup:
1385
1386  if((msgsock != sock) && (msgsock != CURL_SOCKET_BAD))
1387    sclose(msgsock);
1388
1389  if(sock != CURL_SOCKET_BAD)
1390    sclose(sock);
1391
1392  if(wrotepidfile)
1393    unlink(pidname);
1394  if(wroteportfile)
1395    unlink(portname);
1396
1397  restore_signal_handlers(false);
1398
1399  if(got_exit_signal) {
1400    logmsg("============> sockfilt exits with signal (%d)", exit_signal);
1401    /*
1402     * To properly set the return status of the process we
1403     * must raise the same signal SIGINT or SIGTERM that we
1404     * caught and let the old handler take care of it.
1405     */
1406    raise(exit_signal);
1407  }
1408
1409  logmsg("============> sockfilt quits");
1410  return 0;
1411}