Pull capture_loop.c into dumpcap.c, as dumpcap is the only program that

does capturing any more.  (We will be inserting a call to give up
privileges after the pcap_open_live(), which should fix 2273; we're
currently only giving up privileges on platforms with libcap.)

svn path=/trunk/; revision=24345

1 files changed, 0 insertions, 1826 deletions

diff --git a/capture_loop.c b/capture_loop.c
deleted file mode 100644
index 38f7e34674..0000000000
--- a/capture_loop.c
+++ /dev/null
@@ -1,1826 +0,0 @@
-/* capture_loop.c
- * The actual capturing loop, getting packets and storing it
- *
- * $Id$
- *
- * Wireshark - Network traffic analyzer
- * By Gerald Combs <gerald@wireshark.org>
- * Copyright 1998 Gerald Combs
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
- */
-
-
-/** @file
- *
- * Capture loop (internal interface).
- *
- * It will open the input and output files, capture the packets,
- * change ringbuffer output files while capturing and close all files again.
- *
- * The input file can be a network interface or capture pipe (unix only).
- * The output file can be a single or a ringbuffer file handled by wiretap.
- *
- */
-
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
-
-#ifdef HAVE_LIBPCAP
-
-#include <string.h>
-
-#ifdef HAVE_FCNTL_H
-#include <fcntl.h>
-#endif
-
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-
-#ifdef HAVE_SYS_TYPES_H
-# include <sys/types.h>
-#endif
-
-#ifdef HAVE_SYS_STAT_H
-# include <sys/stat.h>
-#endif
-
-#include <signal.h>
-#include <errno.h>
-#include <setjmp.h>
-
-
-#include <glib.h>
-
-#include <pcap.h>
-
-#include "pcapio.h"
-
-#include "capture-pcap-util.h"
-
-#include "capture.h"
-#include "capture_sync.h"
-
-#include "conditions.h"
-#include "capture_stop_conditions.h"
-#include "ringbuffer.h"
-
-#include "simple_dialog.h"
-#include "tempfile.h"
-#include "log.h"
-#include "file_util.h"
-
-#include "epan/unicode-utils.h"
-
-#include "capture_loop.h"
-
-#ifdef NEED_G_ASCII_STRCASECMP_H
-#include "epan/g_ascii_strcasecmp.h"
-#endif
-
-/* E: capture_loop.c only (Wireshark/dumpcap) T: tshark only */
-typedef struct _loop_data {
-  /* common */
-  gboolean       go;                    /* TRUE as long as we're supposed to keep capturing */
-  int            err;                   /* E: if non-zero, error seen while capturing */
-  gint           packet_count;          /* Number of packets we have already captured */
-  gint           packet_max;            /* E: Number of packets we're supposed to capture - 0 means infinite */
-
-  capture_packet_cb_fct  packet_cb;     /* callback for a single captured packet */
-
-  /* pcap "input file" */
-  pcap_t        *pcap_h;                /* pcap handle */
-  gboolean       pcap_err;              /* E: TRUE if error from pcap */
-#ifdef MUST_DO_SELECT
-  int            pcap_fd;               /* pcap file descriptor */
-#endif
-
-  /* capture pipe (unix only "input file") */
-  gboolean       from_cap_pipe;         /* TRUE if we are capturing data from a capture pipe */
-  struct pcap_hdr cap_pipe_hdr;         /* Pcap header when capturing from a pipe */
-  struct pcaprec_modified_hdr cap_pipe_rechdr;  /* Pcap record header when capturing from a pipe */
-  int            cap_pipe_fd;           /* the file descriptor of the capture pipe */
-  gboolean       cap_pipe_modified;     /* TRUE if data in the pipe uses modified pcap headers */
-  gboolean       cap_pipe_byte_swapped; /* TRUE if data in the pipe is byte swapped */
-  unsigned int   cap_pipe_bytes_to_read;/* Used by cap_pipe_dispatch */
-  unsigned int   cap_pipe_bytes_read;   /* Used by cap_pipe_dispatch */
-  enum {
-         STATE_EXPECT_REC_HDR,
-         STATE_READ_REC_HDR,
-         STATE_EXPECT_DATA,
-         STATE_READ_DATA
-       } cap_pipe_state;
-  enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } cap_pipe_err;
-
-  /* output file */
-  FILE          *pdh;
-  int            linktype;
-  gint           wtap_linktype;
-  long           bytes_written;
-
-} loop_data;
-
-/*
- * Standard secondary message for unexpected errors.
- */
-static const char please_report[] =
-    "Please report this to the Wireshark developers.\n"
-    "(This is not a crash; please do not report it as such.)";
-
-/*
- * This needs to be static, so that the SIGUSR1 handler can clear the "go"
- * flag.
- */
-static loop_data   ld;
-
-
-/*
- * Timeout, in milliseconds, for reads from the stream of captured packets.
- */
-#define	CAP_READ_TIMEOUT	250
-static char *cap_pipe_err_str;
-
-static void capture_loop_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
-  const u_char *pd);
-static void capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
-			  int err, gboolean is_close);
-
-
-
-/* Take care of byte order in the libpcap headers read from pipes.
- * (function taken from wiretap/libpcap.c) */
-static void
-cap_pipe_adjust_header(gboolean byte_swapped, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
-{
-  if (byte_swapped) {
-    /* Byte-swap the record header fields. */
-    rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
-    rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
-    rechdr->incl_len = BSWAP32(rechdr->incl_len);
-    rechdr->orig_len = BSWAP32(rechdr->orig_len);
-  }
-
-  /* In file format version 2.3, the "incl_len" and "orig_len" fields were
-     swapped, in order to match the BPF header layout.
-
-     Unfortunately, some files were, according to a comment in the "libpcap"
-     source, written with version 2.3 in their headers but without the
-     interchanged fields, so if "incl_len" is greater than "orig_len" - which
-     would make no sense - we assume that we need to swap them.  */
-  if (hdr->version_major == 2 &&
-      (hdr->version_minor < 3 ||
-       (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
-    guint32 temp;
-
-    temp = rechdr->orig_len;
-    rechdr->orig_len = rechdr->incl_len;
-    rechdr->incl_len = temp;
-  }
-}
-
-/* Provide select() functionality for a single file descriptor
- * on both UNIX/POSIX and Windows.
- *
- * The Windows version calls WaitForSingleObject instead of
- * select().
- *
- * Returns the same values as select.  If an error is returned,
- * the string cap_pipe_err_str should be used instead of errno.
- */
-static int
-cap_pipe_select(int pipe_fd) {
-#ifndef _WIN32
-  fd_set      rfds;
-  struct timeval timeout, *pto;
-  int sel_ret;
-
-  cap_pipe_err_str = "Unknown error";
-
-  FD_ZERO(&rfds);
-  FD_SET(pipe_fd, &rfds);
-
-  timeout.tv_sec = 0;
-  timeout.tv_usec = CAP_READ_TIMEOUT * 1000;
-  pto = &timeout;
-
-  sel_ret = select(pipe_fd+1, &rfds, NULL, NULL, pto);
-  if (sel_ret < 0)
-    cap_pipe_err_str = strerror(errno);
-  return sel_ret;
-}
-#else
-  /* XXX - Should we just use file handles exclusively under Windows?
-   * Otherwise we have to convert between file handles and file descriptors
-   * here and when we open a named pipe.
-   */
-  HANDLE hPipe = (HANDLE) _get_osfhandle(pipe_fd);
-  wchar_t *err_str;
-  DWORD wait_ret;
-
-  if (hPipe == INVALID_HANDLE_VALUE) {
-    cap_pipe_err_str = "Could not open standard input";
-    return -1;
-  }
-
-  cap_pipe_err_str = "Unknown error";
-
-  wait_ret = WaitForSingleObject(hPipe, CAP_READ_TIMEOUT);
-  switch (wait_ret) {
-    /* XXX - This probably isn't correct */
-    case WAIT_ABANDONED:
-      errno = EINTR;
-      return -1;
-    case WAIT_OBJECT_0:
-      return 1;
-    case WAIT_TIMEOUT:
-      return 0;
-    case WAIT_FAILED:
-      FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
-        NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
-      cap_pipe_err_str = utf_16to8(err_str);
-      LocalFree(err_str);
-      return -1;
-    default:
-      g_assert_not_reached();
-      return -1;
-  }
-}
-#endif
-
-
-/* Mimic pcap_open_live() for pipe captures
- * We check if "pipename" is "-" (stdin) or a FIFO, open it, and read the
- * header.
- * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
- * because we can't seek on pipes (see wiretap/libpcap.c for details) */
-static int
-cap_pipe_open_live(char *pipename, struct pcap_hdr *hdr, loop_data *ld,
-                 char *errmsg, int errmsgl)
-{
-#ifndef _WIN32
-  struct stat pipe_stat;
-#else
-#if 1
-  char *pncopy, *pos;
-  wchar_t *err_str;
-#endif
-  HANDLE hPipe = NULL;
-#endif
-  int          sel_ret;
-  int          fd;
-  int          b;
-  guint32       magic;
-  unsigned int bytes_read;
-
-  g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: %s", pipename);
-
-  /*
-   * XXX (T)Wireshark blocks until we return
-   */
-  if (strcmp(pipename, "-") == 0) {
-    fd = 0; /* read from stdin */
-#ifdef _WIN32
-    /*
-     * This is needed to set the stdin pipe into binary mode, otherwise
-     * CR/LF are mangled...
-     */
-    _setmode(0, _O_BINARY);
-#endif  /* _WIN32 */
-  } else {
-#ifndef _WIN32
-    if (eth_stat(pipename, &pipe_stat) < 0) {
-      if (errno == ENOENT || errno == ENOTDIR)
-        ld->cap_pipe_err = PIPNEXIST;
-      else {
-        g_snprintf(errmsg, errmsgl,
-          "The capture session could not be initiated "
-          "due to error on pipe: %s", strerror(errno));
-        ld->cap_pipe_err = PIPERR;
-      }
-      return -1;
-    }
-    if (! S_ISFIFO(pipe_stat.st_mode)) {
-      if (S_ISCHR(pipe_stat.st_mode)) {
-        /*
-         * Assume the user specified an interface on a system where
-         * interfaces are in /dev.  Pretend we haven't seen it.
-         */
-         ld->cap_pipe_err = PIPNEXIST;
-      } else
-      {
-        g_snprintf(errmsg, errmsgl,
-            "The capture session could not be initiated because\n"
-            "\"%s\" is neither an interface nor a pipe", pipename);
-        ld->cap_pipe_err = PIPERR;
-      }
-      return -1;
-    }
-    fd = eth_open(pipename, O_RDONLY | O_NONBLOCK, 0000 /* no creation so don't matter */);
-    if (fd == -1) {
-      g_snprintf(errmsg, errmsgl,
-          "The capture session could not be initiated "
-          "due to error on pipe open: %s", strerror(errno));
-      ld->cap_pipe_err = PIPERR;
-      return -1;
-    }
-#else /* _WIN32 */
-#define PIPE_STR "\\pipe\\"
-    /* Under Windows, named pipes _must_ have the form
-     * "\\<server>\pipe\<pipename>".  <server> may be "." for localhost.
-     */
-    pncopy = g_strdup(pipename);
-    if ( (pos=strstr(pncopy, "\\\\")) == pncopy) {
-      pos = strchr(pncopy + 3, '\\');
-      if (pos && g_ascii_strncasecmp(pos, PIPE_STR, strlen(PIPE_STR)) != 0)
-        pos = NULL;
-    }
-
-    g_free(pncopy);
-
-    if (!pos) {
-      g_snprintf(errmsg, errmsgl,
-          "The capture session could not be initiated because\n"
-          "\"%s\" is neither an interface nor a pipe", pipename);
-      ld->cap_pipe_err = PIPNEXIST;
-      return -1;
-    }
-
-    /* Wait for the pipe to appear */
-    while (1) {
-      hPipe = CreateFile(utf_8to16(pipename), GENERIC_READ, 0, NULL,
-          OPEN_EXISTING, 0, NULL);
-
-      if (hPipe != INVALID_HANDLE_VALUE)
-        break;
-
-      if (GetLastError() != ERROR_PIPE_BUSY) {
-        FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
-          NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
-        g_snprintf(errmsg, errmsgl,
-            "The capture session on \"%s\" could not be initiated "
-            "due to error on pipe open: pipe busy: %s (error %d)",
-	    pipename, utf_16to8(err_str), GetLastError());
-        LocalFree(err_str);
-        ld->cap_pipe_err = PIPERR;
-        return -1;
-      }
-
-      if (!WaitNamedPipe(utf_8to16(pipename), 30 * 1000)) {
-        FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
-          NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
-        g_snprintf(errmsg, errmsgl,
-            "The capture session could not be initiated "
-            "due to error on named pipe open: %s (error %d)",
-	    utf_16to8(err_str), GetLastError());
-        LocalFree(err_str);
-        ld->cap_pipe_err = PIPERR;
-        return -1;
-      }
-    }
-
-    fd = _open_osfhandle((long) hPipe, _O_RDONLY);
-    if (fd == -1) {
-      g_snprintf(errmsg, errmsgl,
-          "The capture session could not be initiated "
-          "due to error on pipe open: %s", strerror(errno));
-      ld->cap_pipe_err = PIPERR;
-      return -1;
-    }
-#endif /* _WIN32 */
-  }
-
-  ld->from_cap_pipe = TRUE;
-
-  /* read the pcap header */
-  bytes_read = 0;
-  while (bytes_read < sizeof magic) {
-    sel_ret = cap_pipe_select(fd);
-    if (sel_ret < 0) {
-      g_snprintf(errmsg, errmsgl,
-        "Unexpected error from select: %s", strerror(errno));
-      goto error;
-    } else if (sel_ret > 0) {
-      b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
-      if (b <= 0) {
-        if (b == 0)
-          g_snprintf(errmsg, errmsgl, "End of file on pipe during open");
-        else
-          g_snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
-            strerror(errno));
-        goto error;
-      }
-      bytes_read += b;
-    }
-  }
-
-  switch (magic) {
-  case PCAP_MAGIC:
-    /* Host that wrote it has our byte order, and was running
-       a program using either standard or ss990417 libpcap. */
-    ld->cap_pipe_byte_swapped = FALSE;
-    ld->cap_pipe_modified = FALSE;
-    break;
-  case PCAP_MODIFIED_MAGIC:
-    /* Host that wrote it has our byte order, but was running
-       a program using either ss990915 or ss991029 libpcap. */
-    ld->cap_pipe_byte_swapped = FALSE;
-    ld->cap_pipe_modified = TRUE;
-    break;
-  case PCAP_SWAPPED_MAGIC:
-    /* Host that wrote it has a byte order opposite to ours,
-       and was running a program using either standard or
-       ss990417 libpcap. */
-    ld->cap_pipe_byte_swapped = TRUE;
-    ld->cap_pipe_modified = FALSE;
-    break;
-  case PCAP_SWAPPED_MODIFIED_MAGIC:
-    /* Host that wrote it out has a byte order opposite to
-       ours, and was running a program using either ss990915
-       or ss991029 libpcap. */
-    ld->cap_pipe_byte_swapped = TRUE;
-    ld->cap_pipe_modified = TRUE;
-    break;
-  default:
-    /* Not a "libpcap" type we know about. */
-    g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
-    goto error;
-  }
-
-  /* Read the rest of the header */
-  bytes_read = 0;
-  while (bytes_read < sizeof(struct pcap_hdr)) {
-    sel_ret = cap_pipe_select(fd);
-    if (sel_ret < 0) {
-      g_snprintf(errmsg, errmsgl,
-        "Unexpected error from select: %s", strerror(errno));
-      goto error;
-    } else if (sel_ret > 0) {
-      b = read(fd, ((char *)hdr)+bytes_read,
-            sizeof(struct pcap_hdr) - bytes_read);
-      if (b <= 0) {
-        if (b == 0)
-          g_snprintf(errmsg, errmsgl, "End of file on pipe during open");
-        else
-          g_snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
-            strerror(errno));
-        goto error;
-      }
-      bytes_read += b;
-    }
-  }
-
-  if (ld->cap_pipe_byte_swapped) {
-    /* Byte-swap the header fields about which we care. */
-    hdr->version_major = BSWAP16(hdr->version_major);
-    hdr->version_minor = BSWAP16(hdr->version_minor);
-    hdr->snaplen = BSWAP32(hdr->snaplen);
-    hdr->network = BSWAP32(hdr->network);
-  }
-  ld->linktype = hdr->network;
-
-  if (hdr->version_major < 2) {
-    g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
-    goto error;
-  }
-
-  ld->cap_pipe_state = STATE_EXPECT_REC_HDR;
-  ld->cap_pipe_err = PIPOK;
-  return fd;
-
-error:
-  g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: error %s", errmsg);
-  ld->cap_pipe_err = PIPERR;
-  eth_close(fd);
-  return -1;
-
-}
-
-
-/* We read one record from the pipe, take care of byte order in the record
- * header, write the record to the capture file, and update capture statistics. */
-static int
-cap_pipe_dispatch(loop_data *ld, guchar *data, char *errmsg, int errmsgl)
-{
-  struct pcap_pkthdr phdr;
-  int b;
-  enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
-          PD_ERR } result;
-
-
-#ifdef LOG_CAPTURE_VERBOSE
-  g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_dispatch");
-#endif
-
-  switch (ld->cap_pipe_state) {
-
-  case STATE_EXPECT_REC_HDR:
-    ld->cap_pipe_bytes_to_read = ld->cap_pipe_modified ?
-      sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
-    ld->cap_pipe_bytes_read = 0;
-    ld->cap_pipe_state = STATE_READ_REC_HDR;
-    /* Fall through */
-
-  case STATE_READ_REC_HDR:
-    b = read(ld->cap_pipe_fd, ((char *)&ld->cap_pipe_rechdr)+ld->cap_pipe_bytes_read,
-             ld->cap_pipe_bytes_to_read - ld->cap_pipe_bytes_read);
-    if (b <= 0) {
-      if (b == 0)
-        result = PD_PIPE_EOF;
-      else
-        result = PD_PIPE_ERR;
-      break;
-    }
-    if ((ld->cap_pipe_bytes_read += b) < ld->cap_pipe_bytes_to_read)
-        return 0;
-    result = PD_REC_HDR_READ;
-    break;
-
-  case STATE_EXPECT_DATA:
-    ld->cap_pipe_bytes_read = 0;
-    ld->cap_pipe_state = STATE_READ_DATA;
-    /* Fall through */
-
-  case STATE_READ_DATA:
-    b = read(ld->cap_pipe_fd, data+ld->cap_pipe_bytes_read,
-             ld->cap_pipe_rechdr.hdr.incl_len - ld->cap_pipe_bytes_read);
-    if (b <= 0) {
-      if (b == 0)
-        result = PD_PIPE_EOF;
-      else
-        result = PD_PIPE_ERR;
-      break;
-    }
-    if ((ld->cap_pipe_bytes_read += b) < ld->cap_pipe_rechdr.hdr.incl_len)
-      return 0;
-    result = PD_DATA_READ;
-    break;
-
-  default:
-    g_snprintf(errmsg, errmsgl, "cap_pipe_dispatch: invalid state");
-    result = PD_ERR;
-
-  } /* switch (ld->cap_pipe_state) */
-
-  /*
-   * We've now read as much data as we were expecting, so process it.
-   */
-  switch (result) {
-
-  case PD_REC_HDR_READ:
-    /* We've read the header. Take care of byte order. */
-    cap_pipe_adjust_header(ld->cap_pipe_byte_swapped, &ld->cap_pipe_hdr,
-                           &ld->cap_pipe_rechdr.hdr);
-    if (ld->cap_pipe_rechdr.hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
-      g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
-        ld->packet_count+1, ld->cap_pipe_rechdr.hdr.incl_len);
-      break;
-    }
-    ld->cap_pipe_state = STATE_EXPECT_DATA;
-    return 0;
-
-  case PD_DATA_READ:
-    /* Fill in a "struct pcap_pkthdr", and process the packet. */
-    phdr.ts.tv_sec = ld->cap_pipe_rechdr.hdr.ts_sec;
-    phdr.ts.tv_usec = ld->cap_pipe_rechdr.hdr.ts_usec;
-    phdr.caplen = ld->cap_pipe_rechdr.hdr.incl_len;
-    phdr.len = ld->cap_pipe_rechdr.hdr.orig_len;
-
-    ld->packet_cb((u_char *)ld, &phdr, data);
-
-    ld->cap_pipe_state = STATE_EXPECT_REC_HDR;
-    return 1;
-
-  case PD_PIPE_EOF:
-    ld->cap_pipe_err = PIPEOF;
-    return -1;
-
-  case PD_PIPE_ERR:
-    g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
-      strerror(errno));
-    /* Fall through */
-  case PD_ERR:
-    break;
-  }
-
-  ld->cap_pipe_err = PIPERR;
-  /* Return here rather than inside the switch to prevent GCC warning */
-  return -1;
-}
-
-
-/* open the capture input file (pcap or capture pipe) */
-static gboolean
-capture_loop_open_input(capture_options *capture_opts, loop_data *ld,
-                        char *errmsg, size_t errmsg_len,
-                        char *secondary_errmsg, size_t secondary_errmsg_len)
-{
-  gchar       open_err_str[PCAP_ERRBUF_SIZE];
-  gchar      *sync_msg_str;
-  static const char ppamsg[] = "can't find PPA for ";
-  const char *set_linktype_err_str;
-  const char  *libpcap_warn;
-#ifdef _WIN32
-  gchar      *sync_secondary_msg_str;
-  int         err;
-  WORD        wVersionRequested;
-  WSADATA     wsaData;
-#endif
-#ifdef HAVE_PCAP_REMOTE
-  struct pcap_rmtauth auth;
-#endif
-
-
-  g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_input : %s", capture_opts->iface);
-
-
-/* XXX - opening Winsock on tshark? */
-
-  /* Initialize Windows Socket if we are in a WIN32 OS
-     This needs to be done before querying the interface for network/netmask */
-#ifdef _WIN32
-  /* XXX - do we really require 1.1 or earlier?
-     Are there any versions that support only 2.0 or higher? */
-  wVersionRequested = MAKEWORD(1, 1);
-  err = WSAStartup(wVersionRequested, &wsaData);
-  if (err != 0) {
-    switch (err) {
-
-    case WSASYSNOTREADY:
-      g_snprintf(errmsg, errmsg_len,
-        "Couldn't initialize Windows Sockets: Network system not ready for network communication");
-      break;
-
-    case WSAVERNOTSUPPORTED:
-      g_snprintf(errmsg, errmsg_len,
-        "Couldn't initialize Windows Sockets: Windows Sockets version %u.%u not supported",
-        LOBYTE(wVersionRequested), HIBYTE(wVersionRequested));
-      break;
-
-    case WSAEINPROGRESS:
-      g_snprintf(errmsg, errmsg_len,
-        "Couldn't initialize Windows Sockets: Blocking operation is in progress");
-      break;
-
-    case WSAEPROCLIM:
-      g_snprintf(errmsg, errmsg_len,
-        "Couldn't initialize Windows Sockets: Limit on the number of tasks supported by this WinSock implementation has been reached");
-      break;
-
-    case WSAEFAULT:
-      g_snprintf(errmsg, errmsg_len,
-        "Couldn't initialize Windows Sockets: Bad pointer passed to WSAStartup");
-      break;
-
-    default:
-      g_snprintf(errmsg, errmsg_len,
-        "Couldn't initialize Windows Sockets: error %d", err);
-      break;
-    }
-    g_snprintf(secondary_errmsg, secondary_errmsg_len, please_report);
-    return FALSE;
-  }
-#endif
-
-  /* Open the network interface to capture from it.
-     Some versions of libpcap may put warnings into the error buffer
-     if they succeed; to tell if that's happened, we have to clear
-     the error buffer, and check if it's still a null string.  */
-  open_err_str[0] = '\0';
-#ifdef HAVE_PCAP_OPEN
-  auth.type = capture_opts->auth_type == CAPTURE_AUTH_PWD ?
-                    RPCAP_RMTAUTH_PWD : RPCAP_RMTAUTH_NULL;
-  auth.username = capture_opts->auth_username;
-  auth.password = capture_opts->auth_password;
-
-  ld->pcap_h = pcap_open(capture_opts->iface,
-               capture_opts->has_snaplen ? capture_opts->snaplen :
-                          WTAP_MAX_PACKET_SIZE,
-               /* flags */
-               (capture_opts->promisc_mode ? PCAP_OPENFLAG_PROMISCUOUS : 0) |
-               (capture_opts->datatx_udp ? PCAP_OPENFLAG_DATATX_UDP : 0) |
-               (capture_opts->nocap_rpcap ? PCAP_OPENFLAG_NOCAPTURE_RPCAP : 0),
-               CAP_READ_TIMEOUT, &auth, open_err_str);
-#else
-  ld->pcap_h = pcap_open_live(capture_opts->iface,
-		       capture_opts->has_snaplen ? capture_opts->snaplen :
-						  WTAP_MAX_PACKET_SIZE,
-		       capture_opts->promisc_mode, CAP_READ_TIMEOUT,
-		       open_err_str);
-#endif
-
-  if (ld->pcap_h != NULL) {
-    /* we've opened "iface" as a network device */
-#ifdef _WIN32
-    /* try to set the capture buffer size */
-    if (pcap_setbuff(ld->pcap_h, capture_opts->buffer_size * 1024 * 1024) != 0) {
-        sync_secondary_msg_str = g_strdup_printf(
-          "The capture buffer size of %luMB seems to be too high for your machine,\n"
-          "the default of 1MB will be used.\n"
-          "\n"
-          "Nonetheless, the capture is started.\n",
-          capture_opts->buffer_size);
-        report_capture_error("Couldn't set the capture buffer size!",
-                                   sync_secondary_msg_str);
-        g_free(sync_secondary_msg_str);
-    }
-#endif
-
-#if defined(HAVE_PCAP_REMOTE) && defined(HAVE_PCAP_SETSAMPLING)
-    if (capture_opts->sampling_method != CAPTURE_SAMP_NONE)
-    {
-        struct pcap_samp *samp;
-
-        if ((samp = pcap_setsampling(ld->pcap_h)) != NULL)
-        {
-            switch (capture_opts->sampling_method)
-            {
-                case CAPTURE_SAMP_BY_COUNT:
-                    samp->method = PCAP_SAMP_1_EVERY_N;
-                    break;
-
-                case CAPTURE_SAMP_BY_TIMER:
-                    samp->method = PCAP_SAMP_FIRST_AFTER_N_MS;
-                    break;
-
-                default:
-                    sync_msg_str = g_strdup_printf(
-                            "Unknown sampling method %d specified,\n"
-                            "continue without packet sampling",
-                            capture_opts->sampling_method);
-                    report_capture_error("Couldn't set the capture "
-                            "sampling", sync_msg_str);
-                    g_free(sync_msg_str);
-            }
-            samp->value = capture_opts->sampling_param;
-        }
-        else
-        {
-            report_capture_error("Couldn't set the capture sampling",
-                    "Cannot get packet sampling data structure");
-        }
-
-    }
-#endif
-
-    /* setting the data link type only works on real interfaces */
-    if (capture_opts->linktype != -1) {
-      set_linktype_err_str = set_pcap_linktype(ld->pcap_h, capture_opts->iface,
-	capture_opts->linktype);
-      if (set_linktype_err_str != NULL) {
-	g_snprintf(errmsg, errmsg_len, "Unable to set data link type (%s).",
-	           set_linktype_err_str);
-        g_snprintf(secondary_errmsg, secondary_errmsg_len, please_report);
-	return FALSE;
-      }
-    }
-    ld->linktype = get_pcap_linktype(ld->pcap_h, capture_opts->iface);
-  } else {
-    /* We couldn't open "iface" as a network device. */
-    /* Try to open it as a pipe */
-    ld->cap_pipe_fd = cap_pipe_open_live(capture_opts->iface, &ld->cap_pipe_hdr, ld, errmsg, errmsg_len);
-
-    if (ld->cap_pipe_fd == -1) {
-
-      if (ld->cap_pipe_err == PIPNEXIST) {
-	/* Pipe doesn't exist, so output message for interface */
-
-	/* If we got a "can't find PPA for X" message, warn the user (who
-	   is running (T)Wireshark on HP-UX) that they don't have a version
-	   of libpcap that properly handles HP-UX (libpcap 0.6.x and later
-	   versions, which properly handle HP-UX, say "can't find /dev/dlpi
-	   PPA for X" rather than "can't find PPA for X"). */
-	if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
-	  libpcap_warn =
-	    "\n\n"
-	    "You are running (T)Wireshark with a version of the libpcap library\n"
-	    "that doesn't handle HP-UX network devices well; this means that\n"
-	    "(T)Wireshark may not be able to capture packets.\n"
-	    "\n"
-	    "To fix this, you should install libpcap 0.6.2, or a later version\n"
-	    "of libpcap, rather than libpcap 0.4 or 0.5.x.  It is available in\n"
-	    "packaged binary form from the Software Porting And Archive Centre\n"
-	    "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
-	    "at the URL lists a number of mirror sites.";
-	else
-	  libpcap_warn = "";
-	g_snprintf(errmsg, errmsg_len,
-	  "The capture session could not be initiated (%s).", open_err_str);
-#ifndef _WIN32
-	g_snprintf(secondary_errmsg, secondary_errmsg_len,
-"Please check to make sure you have sufficient permissions, and that you have "
-"the proper interface or pipe specified.%s", libpcap_warn);
-#else
-    g_snprintf(secondary_errmsg, secondary_errmsg_len,
-"\n"
-"Please check that \"%s\" is the proper interface.\n"
-"\n"
-"\n"
-"Help can be found at:\n"
-"\n"
-"       http://wiki.wireshark.org/CaptureSetup\n"
-"\n"
-"64-bit Windows:\n"
-"WinPcap does not support 64-bit Windows; you will have to use some other\n"
-"tool to capture traffic, such as netcap.\n"
-"For netcap details see: http://support.microsoft.com/?id=310875\n"
-"\n"
-"Modem (PPP/WAN):\n"
-"Note that version 3.0 of WinPcap, and earlier versions of WinPcap, don't\n"
-"support capturing on PPP/WAN interfaces on Windows NT 4.0 / 2000 / XP /\n"
-"Server 2003.\n"
-"WinPcap 3.1 has support for it on Windows 2000 / XP / Server 2003, but has no\n"
-"support for it on Windows NT 4.0 or Windows Vista (Beta 1).",
-    capture_opts->iface);
-#endif /* _WIN32 */
-      }
-      /*
-       * Else pipe (or file) does exist and cap_pipe_open_live() has
-       * filled in errmsg
-       */
-      return FALSE;
-    } else
-      /* cap_pipe_open_live() succeeded; don't want
-         error message from pcap_open_live() */
-      open_err_str[0] = '\0';
-  }
-
-/* XXX - will this work for tshark? */
-#ifdef MUST_DO_SELECT
-  if (!ld->from_cap_pipe) {
-#ifdef HAVE_PCAP_GET_SELECTABLE_FD
-    ld->pcap_fd = pcap_get_selectable_fd(ld->pcap_h);
-#else
-    ld->pcap_fd = pcap_fileno(ld->pcap_h);
-#endif
-  }
-#endif
-
-  /* Does "open_err_str" contain a non-empty string?  If so, "pcap_open_live()"
-     returned a warning; print it, but keep capturing. */
-  if (open_err_str[0] != '\0') {
-    sync_msg_str = g_strdup_printf("%s.", open_err_str);
-    report_capture_error(sync_msg_str, "");
-    g_free(sync_msg_str);
-  }
-
-  return TRUE;
-}
-
-
-/* close the capture input file (pcap or capture pipe) */
-static void capture_loop_close_input(loop_data *ld) {
-
-  g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input");
-
-  /* if open, close the capture pipe "input file" */
-  if (ld->cap_pipe_fd >= 0) {
-    g_assert(ld->from_cap_pipe);
-    eth_close(ld->cap_pipe_fd);
-    ld->cap_pipe_fd = 0;
-  }
-
-  /* if open, close the pcap "input file" */
-  if(ld->pcap_h != NULL) {
-    g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input: closing %p", ld->pcap_h);
-    g_assert(!ld->from_cap_pipe);
-    pcap_close(ld->pcap_h);
-    ld->pcap_h = NULL;
-  }
-
-  ld->go = FALSE;
-
-#ifdef _WIN32
-  /* Shut down windows sockets */
-  WSACleanup();
-#endif
-}
-
-
-/* init the capture filter */
-static initfilter_status_t
-capture_loop_init_filter(pcap_t *pcap_h, gboolean from_cap_pipe, gchar * iface, gchar * cfilter) {
-  bpf_u_int32 netnum, netmask;
-  gchar       lookup_net_err_str[PCAP_ERRBUF_SIZE];
-  struct bpf_program fcode;
-
-
-  g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_filter: %s", cfilter);
-
-  /* capture filters only work on real interfaces */
-  if (cfilter && !from_cap_pipe) {
-    /* A capture filter was specified; set it up. */
-    if (pcap_lookupnet(iface, &netnum, &netmask, lookup_net_err_str) < 0) {
-      /*
-       * Well, we can't get the netmask for this interface; it's used
-       * only for filters that check for broadcast IP addresses, so
-       * we just punt and use 0.  It might be nice to warn the user,
-       * but that's a pain in a GUI application, as it'd involve popping
-       * up a message box, and it's not clear how often this would make
-       * a difference (only filters that check for IP broadcast addresses
-       * use the netmask).
-       */
-      /*cmdarg_err(
-        "Warning:  Couldn't obtain netmask info (%s).", lookup_net_err_str);*/
-      netmask = 0;
-    }
-    if (pcap_compile(pcap_h, &fcode, cfilter, 1, netmask) < 0) {
-      /* Treat this specially - our caller might try to compile this
-         as a display filter and, if that succeeds, warn the user that
-         the display and capture filter syntaxes are different. */
-      return INITFILTER_BAD_FILTER;
-    }
-    if (pcap_setfilter(pcap_h, &fcode) < 0) {
-#ifdef HAVE_PCAP_FREECODE
-      pcap_freecode(&fcode);
-#endif
-      return INITFILTER_OTHER_ERROR;
-    }
-#ifdef HAVE_PCAP_FREECODE
-    pcap_freecode(&fcode);
-#endif
-  }
-
-  return INITFILTER_NO_ERROR;
-}
-
-
-/* set up to write to the already-opened capture output file/files */
-static gboolean
-capture_loop_init_output(capture_options *capture_opts, int save_file_fd, loop_data *ld, char *errmsg, int errmsg_len) {
-  int         file_snaplen;
-  int         err;
-
-
-  g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_output");
-
-  /* get snaplen */
-  if (ld->from_cap_pipe) {
-    file_snaplen = ld->cap_pipe_hdr.snaplen;
-  } else
-  {
-    file_snaplen = pcap_snapshot(ld->pcap_h);
-  }
-
-  /* Set up to write to the capture file. */
-  if (capture_opts->multi_files_on) {
-    ld->pdh = ringbuf_init_libpcap_fdopen(ld->linktype, file_snaplen,
-                                          &ld->bytes_written, &err);
-  } else {
-    ld->pdh = libpcap_fdopen(save_file_fd, ld->linktype, file_snaplen,
-                             &ld->bytes_written, &err);
-  }
-
-  if (ld->pdh == NULL) {
-    /* We couldn't set up to write to the capture file. */
-    /* XXX - use cf_open_error_message from tshark instead? */
-    switch (err) {
-
-    case WTAP_ERR_CANT_OPEN:
-      g_snprintf(errmsg, errmsg_len, "The file to which the capture would be saved"
-               " couldn't be created for some unknown reason.");
-      break;
-
-    case WTAP_ERR_SHORT_WRITE:
-      g_snprintf(errmsg, errmsg_len, "A full header couldn't be written to the file"
-               " to which the capture would be saved.");
-      break;
-
-    default:
-      if (err < 0) {
-        g_snprintf(errmsg, errmsg_len,
-		     "The file to which the capture would be"
-                     " saved (\"%s\") could not be opened: Error %d.",
- 			capture_opts->save_file, err);
-      } else {
-        g_snprintf(errmsg, errmsg_len,
-		     "The file to which the capture would be"
-                     " saved (\"%s\") could not be opened: %s.",
- 			capture_opts->save_file, strerror(err));
-      }
-      break;
-    }
-
-    return FALSE;
-  }
-
-  return TRUE;
-}
-
-static gboolean
-capture_loop_close_output(capture_options *capture_opts, loop_data *ld, int *err_close) {
-
-  g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_output");
-
-  if (capture_opts->multi_files_on) {
-    return ringbuf_libpcap_dump_close(&capture_opts->save_file, err_close);
-  } else {
-    return libpcap_dump_close(ld->pdh, err_close);
-  }
-}
-
-/* dispatch incoming packets (pcap or capture pipe)
- *
- * Waits for incoming packets to be available, and calls pcap_dispatch()
- * to cause them to be processed.
- *
- * Returns the number of packets which were processed.
- *
- * Times out (returning zero) after CAP_READ_TIMEOUT ms; this ensures that the
- * packet-batching behaviour does not cause packets to get held back
- * indefinitely.
- */
-static int
-capture_loop_dispatch(capture_options *capture_opts _U_, loop_data *ld,
-		      char *errmsg, int errmsg_len)
-{
-  int       inpkts;
-  int       sel_ret;
-  gint      packet_count_before;
-  guchar    pcap_data[WTAP_MAX_PACKET_SIZE];
-
-  packet_count_before = ld->packet_count;
-  if (ld->from_cap_pipe) {
-    /* dispatch from capture pipe */
-#ifdef LOG_CAPTURE_VERBOSE
-    g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from capture pipe");
-#endif
-    sel_ret = cap_pipe_select(ld->cap_pipe_fd);
-    if (sel_ret <= 0) {
-      inpkts = 0;
-      if (sel_ret < 0 && errno != EINTR) {
-        g_snprintf(errmsg, errmsg_len,
-          "Unexpected error from select: %s", strerror(errno));
-        report_capture_error(errmsg, please_report);
-        ld->go = FALSE;
-      }
-    } else {
-      /*
-       * "select()" says we can read from the pipe without blocking
-       */
-      inpkts = cap_pipe_dispatch(ld, pcap_data, errmsg, errmsg_len);
-      if (inpkts < 0) {
-        ld->go = FALSE;
-      }
-    }
-  }
-  else
-  {
-    /* dispatch from pcap */
-#ifdef MUST_DO_SELECT
-    /*
-     * If we have "pcap_get_selectable_fd()", we use it to get the
-     * descriptor on which to select; if that's -1, it means there
-     * is no descriptor on which you can do a "select()" (perhaps
-     * because you're capturing on a special device, and that device's
-     * driver unfortunately doesn't support "select()", in which case
-     * we don't do the select - which means it might not be possible
-     * to stop a capture until a packet arrives.  If that's unacceptable,
-     * plead with whoever supplies the software for that device to add
-     * "select()" support, or upgrade to libpcap 0.8.1 or later, and
-     * rebuild Wireshark or get a version built with libpcap 0.8.1 or
-     * later, so it can use pcap_breakloop().
-     */
-#ifdef LOG_CAPTURE_VERBOSE
-    g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch with select");
-#endif
-    if (ld->pcap_fd != -1) {
-      sel_ret = cap_pipe_select(ld->pcap_fd);
-      if (sel_ret > 0) {
-        /*
-         * "select()" says we can read from it without blocking; go for
-         * it.
-         *
-         * We don't have pcap_breakloop(), so we only process one packet
-         * per pcap_dispatch() call, to allow a signal to stop the
-         * processing immediately, rather than processing all packets
-         * in a batch before quitting.
-         */
-        inpkts = pcap_dispatch(ld->pcap_h, 1, ld->packet_cb, (u_char *)ld);
-        if (inpkts < 0) {
-          ld->pcap_err = TRUE;
-          ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
-        }
-      } else {
-        if (sel_ret < 0 && errno != EINTR) {
-          g_snprintf(errmsg, errmsg_len,
-            "Unexpected error from select: %s", strerror(errno));
-          report_capture_error(errmsg, please_report);
-          ld->go = FALSE;
-        }
-      }
-    }
-    else
-#endif /* MUST_DO_SELECT */
-    {
-      /* dispatch from pcap without select */
-#if 1
-#ifdef LOG_CAPTURE_VERBOSE
-      g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch");
-#endif
-#ifdef _WIN32
-      /*
-       * On Windows, we don't support asynchronously telling a process to
-       * stop capturing; instead, we check for an indication on a pipe
-       * after processing packets.  We therefore process only one packet
-       * at a time, so that we can check the pipe after every packet.
-       */
-      inpkts = pcap_dispatch(ld->pcap_h, 1, ld->packet_cb, (u_char *) ld);
-#else
-      inpkts = pcap_dispatch(ld->pcap_h, -1, ld->packet_cb, (u_char *) ld);
-#endif
-      if (inpkts < 0) {
-        if (inpkts == -1) {
-          /* Error, rather than pcap_breakloop(). */
-          ld->pcap_err = TRUE;
-        }
-        ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
-      }
-#else /* pcap_next_ex */
-#ifdef LOG_CAPTURE_VERBOSE
-      g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_next_ex");
-#endif
-      /* XXX - this is currently unused, as there is some confusion with pcap_next_ex() vs. pcap_dispatch() */
-
-      /*
-       * WinPcap's remote capturing feature doesn't work with pcap_dispatch(),
-       * see http://wiki.wireshark.org/CaptureSetup_2fWinPcapRemote
-       * This should be fixed in the WinPcap 4.0 alpha release.
-       *
-       * For reference, an example remote interface:
-       * rpcap://[1.2.3.4]/\Device\NPF_{39993D68-7C9B-4439-A329-F2D888DA7C5C}
-       */
-
-      /* emulate dispatch from pcap */
-      {
-        int in;
-        struct pcap_pkthdr *pkt_header;
-        u_char *pkt_data;
-
-        in = 0;
-        while(ld->go &&
-              (in = pcap_next_ex(ld->pcap_h, &pkt_header, &pkt_data)) == 1)
-          ld->packet_cb( (u_char *) ld, pkt_header, pkt_data);
-
-        if(in < 0) {
-          ld->pcap_err = TRUE;
-          ld->go = FALSE;
-        }
-      }
-#endif /* pcap_next_ex */
-    }
-  }
-
-#ifdef LOG_CAPTURE_VERBOSE
-  g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: %d new packet%s", inpkts, plurality(inpkts, "", "s"));
-#endif
-
-  return ld->packet_count - packet_count_before;
-}
-
-
-/* open the output file (temporary/specified name/ringbuffer/named pipe/stdout) */
-/* Returns TRUE if the file opened successfully, FALSE otherwise. */
-static gboolean
-capture_loop_open_output(capture_options *capture_opts, int *save_file_fd,
-		      char *errmsg, int errmsg_len) {
-
-  char tmpname[128+1];
-  gchar *capfile_name;
-  gboolean is_tempfile;
-
-
-  g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_output: %s",
-      (capture_opts->save_file) ? capture_opts->save_file : "");
-
-  if (capture_opts->save_file != NULL) {
-    /* We return to the caller while the capture is in progress.
-     * Therefore we need to take a copy of save_file in
-     * case the caller destroys it after we return.
-     */
-    capfile_name = g_strdup(capture_opts->save_file);
-
-    if (capture_opts->output_to_pipe == TRUE) { /* either "-" or named pipe */
-      if (capture_opts->multi_files_on) {
-        /* ringbuffer is enabled; that doesn't work with standard output or a named pipe */
-        g_snprintf(errmsg, errmsg_len,
-	    "Ring buffer requested, but capture is being written to standard output or to a named pipe.");
-        g_free(capfile_name);
-        return FALSE;
-      }
-      if (strcmp(capfile_name, "-") == 0) {
-        /* write to stdout */
-        *save_file_fd = 1;
-#ifdef _WIN32
-        /* set output pipe to binary mode to avoid Windows text-mode processing (eg: for CR/LF)  */
-        _setmode(1, O_BINARY);
-#endif
-      }
-    } /* if (...output_to_pipe ... */
-
-    else {
-      if (capture_opts->multi_files_on) {
-        /* ringbuffer is enabled */
-        *save_file_fd = ringbuf_init(capfile_name,
-            (capture_opts->has_ring_num_files) ? capture_opts->ring_num_files : 0);
-
-        /* we need the ringbuf name */
-        if(*save_file_fd != -1) {
-            g_free(capfile_name);
-            capfile_name = g_strdup(ringbuf_current_filename());
-        }
-      } else {
-        /* Try to open/create the specified file for use as a capture buffer. */
-        *save_file_fd = eth_open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT,
-                             0600);
-      }
-    }
-    is_tempfile = FALSE;
-  } else {
-    /* Choose a random name for the temporary capture buffer */
-    *save_file_fd = create_tempfile(tmpname, sizeof tmpname, "ether");
-    capfile_name = g_strdup(tmpname);
-    is_tempfile = TRUE;
-  }
-
-  /* did we fail to open the output file? */
-  if (*save_file_fd == -1) {
-    if (is_tempfile) {
-      g_snprintf(errmsg, errmsg_len,
-	"The temporary file to which the capture would be saved (\"%s\") "
-	"could not be opened: %s.", capfile_name, strerror(errno));
-    } else {
-      if (capture_opts->multi_files_on) {
-        ringbuf_error_cleanup();
-      }
-
-      g_snprintf(errmsg, errmsg_len,
-	    "The file to which the capture would be saved (\"%s\") "
-        "could not be opened: %s.", capfile_name,
-        strerror(errno));
-    }
-    g_free(capfile_name);
-    return FALSE;
-  }
-
-  if(capture_opts->save_file != NULL) {
-    g_free(capture_opts->save_file);
-  }
-  capture_opts->save_file = capfile_name;
-  /* capture_opts.save_file is "g_free"ed later, which is equivalent to
-     "g_free(capfile_name)". */
-#ifndef _WIN32
-  fchown(*save_file_fd, capture_opts->owner, capture_opts->group);
-#endif
-
-  return TRUE;
-}
-
-
-static void
-capture_loop_stop_signal_handler(int signo _U_)
-{
-  g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Signal: Stop capture");
-  capture_loop_stop();
-}
-
-#ifdef _WIN32
-#define TIME_GET() GetTickCount()
-#else
-#define TIME_GET() time(NULL)
-#endif
-
-/* Do the low-level work of a capture.
-   Returns TRUE if it succeeds, FALSE otherwise. */
-int
-capture_loop_start(capture_options *capture_opts, gboolean *stats_known, struct pcap_stat *stats)
-{
-#ifndef _WIN32
-  struct sigaction act;
-#endif
-  time_t      upd_time, cur_time;
-  time_t      start_time;
-  int         err_close;
-  int         inpkts;
-  gint        inpkts_to_sync_pipe = 0;     /* packets not already send out to the sync_pipe */
-  condition  *cnd_file_duration = NULL;
-  condition  *cnd_autostop_files = NULL;
-  condition  *cnd_autostop_size = NULL;
-  condition  *cnd_autostop_duration = NULL;
-  guint32     autostop_files = 0;
-  gboolean    write_ok;
-  gboolean    close_ok;
-  gboolean    cfilter_error = FALSE;
-#define MSG_MAX_LENGTH 4096
-  char        errmsg[MSG_MAX_LENGTH+1];
-  char        secondary_errmsg[MSG_MAX_LENGTH+1];
-  int         save_file_fd = -1;
-
-  *errmsg           = '\0';
-  *secondary_errmsg = '\0';
-
-  /* init the loop data */
-  ld.go                 = TRUE;
-  ld.packet_count       = 0;
-  if (capture_opts->has_autostop_packets)
-    ld.packet_max       = capture_opts->autostop_packets;
-  else
-    ld.packet_max       = 0;	/* no limit */
-  ld.err                = 0;	/* no error seen yet */
-  ld.wtap_linktype      = WTAP_ENCAP_UNKNOWN;
-  ld.pcap_err           = FALSE;
-  ld.from_cap_pipe      = FALSE;
-  ld.pdh                = NULL;
-  ld.cap_pipe_fd        = -1;
-#ifdef MUST_DO_SELECT
-  ld.pcap_fd            = 0;
-#endif
-  ld.packet_cb          = capture_loop_packet_cb;
-
-
-  /* We haven't yet gotten the capture statistics. */
-  *stats_known      = FALSE;
-
-#ifndef _WIN32
-  /*
-   * Catch SIGUSR1, so that we exit cleanly if the parent process
-   * kills us with it due to the user selecting "Capture->Stop".
-   */
-  act.sa_handler = capture_loop_stop_signal_handler;
-  /*
-   * Arrange that system calls not get restarted, because when
-   * our signal handler returns we don't want to restart
-   * a call that was waiting for packets to arrive.
-   */
-  act.sa_flags = 0;
-  sigemptyset(&act.sa_mask);
-  sigaction(SIGUSR1, &act, NULL);
-#endif /* _WIN32 */
-
-  g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop starting ...");
-  capture_opts_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, capture_opts);
-
-  /* open the "input file" from network interface or capture pipe */
-  if (!capture_loop_open_input(capture_opts, &ld, errmsg, sizeof(errmsg),
-                               secondary_errmsg, sizeof(secondary_errmsg))) {
-    goto error;
-  }
-
-  /* init the input filter from the network interface (capture pipe will do nothing) */
-  switch (capture_loop_init_filter(ld.pcap_h, ld.from_cap_pipe, capture_opts->iface, capture_opts->cfilter)) {
-
-  case INITFILTER_NO_ERROR:
-    break;
-
-  case INITFILTER_BAD_FILTER:
-    cfilter_error = TRUE;
-    g_snprintf(errmsg, sizeof(errmsg), "%s", pcap_geterr(ld.pcap_h));
-    goto error;
-
-  case INITFILTER_OTHER_ERROR:
-    g_snprintf(errmsg, sizeof(errmsg), "Can't install filter (%s).",
-               pcap_geterr(ld.pcap_h));
-    g_snprintf(secondary_errmsg, sizeof(secondary_errmsg), "%s", please_report);
-    goto error;
-  }
-
-  /* If we're supposed to write to a capture file, open it for output
-     (temporary/specified name/ringbuffer) */
-  if (capture_opts->saving_to_file) {
-    if (!capture_loop_open_output(capture_opts, &save_file_fd, errmsg, sizeof(errmsg))) {
-      goto error;
-    }
-
-    /* set up to write to the already-opened capture output file/files */
-    if (!capture_loop_init_output(capture_opts, save_file_fd, &ld, errmsg, sizeof(errmsg))) {
-      goto error;
-    }
-
-  /* XXX - capture SIGTERM and close the capture, in case we're on a
-     Linux 2.0[.x] system and you have to explicitly close the capture
-     stream in order to turn promiscuous mode off?  We need to do that
-     in other places as well - and I don't think that works all the
-     time in any case, due to libpcap bugs. */
-
-    /* Well, we should be able to start capturing.
-
-       Sync out the capture file, so the header makes it to the file system,
-       and send a "capture started successfully and capture file created"
-       message to our parent so that they'll open the capture file and
-       update its windows to indicate that we have a live capture in
-       progress. */
-    libpcap_dump_flush(ld.pdh, NULL);
-    report_new_capture_file(capture_opts->save_file);
-  }
-
-  /* initialize capture stop (and alike) conditions */
-  init_capture_stop_conditions();
-  /* create stop conditions */
-  if (capture_opts->has_autostop_filesize)
-    cnd_autostop_size =
-        cnd_new(CND_CLASS_CAPTURESIZE,(long)capture_opts->autostop_filesize * 1024);
-  if (capture_opts->has_autostop_duration)
-    cnd_autostop_duration =
-        cnd_new(CND_CLASS_TIMEOUT,(gint32)capture_opts->autostop_duration);
-
-  if (capture_opts->multi_files_on) {
-      if (capture_opts->has_file_duration)
-        cnd_file_duration =
-	    cnd_new(CND_CLASS_TIMEOUT, capture_opts->file_duration);
-
-      if (capture_opts->has_autostop_files)
-        cnd_autostop_files =
-	    cnd_new(CND_CLASS_CAPTURESIZE, capture_opts->autostop_files);
-  }
-
-  /* init the time values */
-  start_time = TIME_GET();
-  upd_time = TIME_GET();
-
-  g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop running!");
-
-  /* WOW, everything is prepared! */
-  /* please fasten your seat belts, we will enter now the actual capture loop */
-  while (ld.go) {
-    /* dispatch incoming packets */
-    inpkts = capture_loop_dispatch(capture_opts, &ld, errmsg, sizeof(errmsg));
-
-#ifdef _WIN32
-    /* any news from our parent (signal pipe)? -> just stop the capture */
-    if (!signal_pipe_check_running()) {
-      ld.go = FALSE;
-    }
-#endif
-
-    if (inpkts > 0) {
-      inpkts_to_sync_pipe += inpkts;
-
-      /* check capture size condition */
-      if (cnd_autostop_size != NULL &&
-          cnd_eval(cnd_autostop_size, (guint32)ld.bytes_written)){
-        /* Capture size limit reached, do we have another file? */
-        if (capture_opts->multi_files_on) {
-          if (cnd_autostop_files != NULL &&
-              cnd_eval(cnd_autostop_files, ++autostop_files)) {
-             /* no files left: stop here */
-            ld.go = FALSE;
-            continue;
-          }
-
-          /* Switch to the next ringbuffer file */
-          if (ringbuf_switch_file(&ld.pdh, &capture_opts->save_file,
-              &save_file_fd, &ld.bytes_written, &ld.err)) {
-            /* File switch succeeded: reset the conditions */
-            cnd_reset(cnd_autostop_size);
-            if (cnd_file_duration) {
-              cnd_reset(cnd_file_duration);
-            }
-            libpcap_dump_flush(ld.pdh, NULL);
-            report_packet_count(inpkts_to_sync_pipe);
-            inpkts_to_sync_pipe = 0;
-            report_new_capture_file(capture_opts->save_file);
-          } else {
-            /* File switch failed: stop here */
-            ld.go = FALSE;
-            continue;
-          }
-        } else {
-          /* single file, stop now */
-          ld.go = FALSE;
-          continue;
-        }
-      } /* cnd_autostop_size */
-      if (capture_opts->output_to_pipe) {
-        libpcap_dump_flush(ld.pdh, NULL);
-      }
-    } /* inpkts */
-
-    /* Only update once a second (Win32: 500ms) so as not to overload slow
-     * displays. This also prevents too much context-switching between the
-     * dumpcap and wireshark processes */
-    cur_time = TIME_GET();
-#ifdef _WIN32
-    if ( (cur_time - upd_time) > 500) {
-#else
-    if (cur_time - upd_time > 0) {
-#endif
-        upd_time = cur_time;
-
-      /*if (pcap_stats(pch, stats) >= 0) {
-        *stats_known = TRUE;
-      }*/
-
-      /* Let the parent process know. */
-      if (inpkts_to_sync_pipe) {
-        /* do sync here */
-        libpcap_dump_flush(ld.pdh, NULL);
-
-        /* Send our parent a message saying we've written out "inpkts_to_sync_pipe"
-           packets to the capture file. */
-        report_packet_count(inpkts_to_sync_pipe);
-
-        inpkts_to_sync_pipe = 0;
-      }
-
-      /* check capture duration condition */
-      if (cnd_autostop_duration != NULL && cnd_eval(cnd_autostop_duration)) {
-        /* The maximum capture time has elapsed; stop the capture. */
-        ld.go = FALSE;
-        continue;
-      }
-
-      /* check capture file duration condition */
-      if (cnd_file_duration != NULL && cnd_eval(cnd_file_duration)) {
-        /* duration limit reached, do we have another file? */
-        if (capture_opts->multi_files_on) {
-          if (cnd_autostop_files != NULL &&
-              cnd_eval(cnd_autostop_files, ++autostop_files)) {
-            /* no files left: stop here */
-            ld.go = FALSE;
-            continue;
-          }
-
-          /* Switch to the next ringbuffer file */
-          if (ringbuf_switch_file(&ld.pdh, &capture_opts->save_file,
-                                  &save_file_fd, &ld.bytes_written, &ld.err)) {
-            /* file switch succeeded: reset the conditions */
-            cnd_reset(cnd_file_duration);
-            if(cnd_autostop_size)
-              cnd_reset(cnd_autostop_size);
-            libpcap_dump_flush(ld.pdh, NULL);
-            report_packet_count(inpkts_to_sync_pipe);
-            inpkts_to_sync_pipe = 0;
-            report_new_capture_file(capture_opts->save_file);
-          } else {
-            /* File switch failed: stop here */
-            ld.go = FALSE;
-            continue;
-          }
-        } else {
-          /* single file, stop now */
-          ld.go = FALSE;
-          continue;
-        }
-      } /* cnd_file_duration */
-    }
-
-  } /* while (ld.go) */
-
-  g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopping ...");
-
-  /* delete stop conditions */
-  if (cnd_file_duration != NULL)
-    cnd_delete(cnd_file_duration);
-  if (cnd_autostop_files != NULL)
-    cnd_delete(cnd_autostop_files);
-  if (cnd_autostop_size != NULL)
-    cnd_delete(cnd_autostop_size);
-  if (cnd_autostop_duration != NULL)
-    cnd_delete(cnd_autostop_duration);
-
-  /* did we had a pcap (input) error? */
-  if (ld.pcap_err) {
-    /* On Linux, if an interface goes down while you're capturing on it,
-       you'll get a "recvfrom: Network is down" error (ENETDOWN).
-       (At least you will if strerror() doesn't show a local translation
-       of the error.)
-
-       On FreeBSD and OS X, if a network adapter disappears while
-       you're capturing on it, you'll get a "read: Device not configured"
-       error (ENXIO).  (See previous parenthetical note.)
-
-       On OpenBSD, you get "read: I/O error" (EIO) in the same case.
-
-       These should *not* be reported to the Wireshark developers. */
-    char *cap_err_str;
-
-    cap_err_str = pcap_geterr(ld.pcap_h);
-    if (strcmp(cap_err_str, "recvfrom: Network is down") == 0 ||
-        strcmp(cap_err_str, "read: Device not configured") == 0 ||
-        strcmp(cap_err_str, "read: I/O error") == 0) {
-      report_capture_error("The network adapter on which the capture was being done "
-                           "is no longer running; the capture has stopped.",
-                           "");
-    } else {
-      g_snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
-        cap_err_str);
-      report_capture_error(errmsg, please_report);
-    }
-  }
-  else if (ld.from_cap_pipe && ld.cap_pipe_err == PIPERR)
-    report_capture_error(errmsg, "");
-
-  /* did we had an error while capturing? */
-  if (ld.err == 0) {
-    write_ok = TRUE;
-  } else {
-    capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, ld.err,
-			      FALSE);
-    report_capture_error(errmsg, please_report);
-    write_ok = FALSE;
-  }
-
-  if (capture_opts->saving_to_file) {
-    /* close the wiretap (output) file */
-    close_ok = capture_loop_close_output(capture_opts, &ld, &err_close);
-  } else
-    close_ok = TRUE;
-
-  /* there might be packets not yet notified to the parent */
-  /* (do this after closing the file, so all packets are already flushed) */
-  if(inpkts_to_sync_pipe) {
-    report_packet_count(inpkts_to_sync_pipe);
-    inpkts_to_sync_pipe = 0;
-  }
-
-  /* If we've displayed a message about a write error, there's no point
-     in displaying another message about an error on close. */
-  if (!close_ok && write_ok) {
-    capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, err_close,
-		TRUE);
-    report_capture_error(errmsg, "");
-  }
-
-  /*
-   * XXX We exhibit different behaviour between normal mode and sync mode
-   * when the pipe is stdin and not already at EOF.  If we're a child, the
-   * parent's stdin isn't closed, so if the user starts another capture,
-   * cap_pipe_open_live() will very likely not see the expected magic bytes and
-   * will say "Unrecognized libpcap format".  On the other hand, in normal
-   * mode, cap_pipe_open_live() will say "End of file on pipe during open".
-   */
-
-  /* get packet drop statistics from pcap */
-  if(ld.pcap_h != NULL) {
-    g_assert(!ld.from_cap_pipe);
-    /* Get the capture statistics, so we know how many packets were
-       dropped. */
-    if (pcap_stats(ld.pcap_h, stats) >= 0) {
-      *stats_known = TRUE;
-      /* Let the parent process know. */
-      report_packet_drops(stats->ps_drop);
-    } else {
-      g_snprintf(errmsg, sizeof(errmsg),
-		"Can't get packet-drop statistics: %s",
-		pcap_geterr(ld.pcap_h));
-      report_capture_error(errmsg, please_report);
-    }
-  }
-
-  /* close the input file (pcap or capture pipe) */
-  capture_loop_close_input(&ld);
-
-  g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped!");
-
-  /* ok, if the write and the close were successful. */
-  return write_ok && close_ok;
-
-error:
-  if (capture_opts->multi_files_on) {
-    /* cleanup ringbuffer */
-    ringbuf_error_cleanup();
-  } else {
-    /* We can't use the save file, and we have no FILE * for the stream
-       to close in order to close it, so close the FD directly. */
-    if(save_file_fd != -1) {
-      eth_close(save_file_fd);
-    }
-
-    /* We couldn't even start the capture, so get rid of the capture
-       file. */
-    if(capture_opts->save_file != NULL) {
-      eth_unlink(capture_opts->save_file);
-      g_free(capture_opts->save_file);
-    }
-  }
-  capture_opts->save_file = NULL;
-  if (cfilter_error)
-    report_cfilter_error(capture_opts->cfilter, errmsg);
-  else
-    report_capture_error(errmsg, secondary_errmsg);
-
-  /* close the input file (pcap or cap_pipe) */
-  capture_loop_close_input(&ld);
-
-  g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped with error");
-
-  return FALSE;
-}
-
-
-void capture_loop_stop(void)
-{
-#ifdef HAVE_PCAP_BREAKLOOP
-  if(ld.pcap_h != NULL)
-    pcap_breakloop(ld.pcap_h);
-#endif
-  ld.go = FALSE;
-}
-
-
-static void
-capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
-			  int err, gboolean is_close)
-{
-  switch (err) {
-
-  case ENOSPC:
-    g_snprintf(errmsg, errmsglen,
-		"Not all the packets could be written to the file"
-		" to which the capture was being saved\n"
-		"(\"%s\") because there is no space left on the file system\n"
-		"on which that file resides.",
-		fname);
-    break;
-
-#ifdef EDQUOT
-  case EDQUOT:
-    g_snprintf(errmsg, errmsglen,
-		"Not all the packets could be written to the file"
-		" to which the capture was being saved\n"
-		"(\"%s\") because you are too close to, or over,"
-		" your disk quota\n"
-		"on the file system on which that file resides.",
-		fname);
-  break;
-#endif
-
-  case WTAP_ERR_CANT_CLOSE:
-    g_snprintf(errmsg, errmsglen,
-		"The file to which the capture was being saved"
-		" couldn't be closed for some unknown reason.");
-    break;
-
-  case WTAP_ERR_SHORT_WRITE:
-    g_snprintf(errmsg, errmsglen,
-		"Not all the packets could be written to the file"
-		" to which the capture was being saved\n"
-		"(\"%s\").",
-		fname);
-    break;
-
-  default:
-    if (is_close) {
-      g_snprintf(errmsg, errmsglen,
-		"The file to which the capture was being saved\n"
-		"(\"%s\") could not be closed: %s.",
-		fname, wtap_strerror(err));
-    } else {
-      g_snprintf(errmsg, errmsglen,
-		"An error occurred while writing to the file"
-		" to which the capture was being saved\n"
-		"(\"%s\"): %s.",
-		fname, wtap_strerror(err));
-    }
-    break;
-  }
-}
-
-
-/* one packet was captured, process it */
-static void
-capture_loop_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
-  const u_char *pd)
-{
-  loop_data *ld = (void *) user;
-  int err;
-
-  /* if the user told us to stop after x packets, do we already have enough? */
-  if ((ld->packet_max > 0) && (ld->packet_count >= ld->packet_max))
-  {
-     ld->go = FALSE;
-     return;
-  }
-
-  /* We may be called multiple times from pcap_dispatch(); if we've set
-     the "stop capturing" flag, ignore this packet, as we're not
-     supposed to be saving any more packets. */
-  if (!ld->go)
-    return;
-
-  if (ld->pdh) {
-    /* We're supposed to write the packet to a file; do so.
-       If this fails, set "ld->go" to FALSE, to stop the capture, and set
-       "ld->err" to the error. */
-    if (!libpcap_write_packet(ld->pdh, phdr, pd, &ld->bytes_written, &err)) {
-      ld->go = FALSE;
-      ld->err = err;
-    } else
-      ld->packet_count++;
-  }
-}
-
-#endif /* HAVE_LIBPCAP */