5b1484f7b3
to the networking stack will have an exception frame header. Note, however, that on the BSD's ARCNET might be a bit of a mess. svn path=/trunk/; revision=6986
2268 lines
68 KiB
C
2268 lines
68 KiB
C
/* capture.c
|
|
* Routines for packet capture windows
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*
|
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* $Id: capture.c,v 1.205 2003/01/23 09:04:54 guy Exp $
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*
|
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* Ethereal - Network traffic analyzer
|
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* By Gerald Combs <gerald@ethereal.com>
|
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
|
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* modify it under the terms of the GNU General Public License
|
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* as published by the Free Software Foundation; either version 2
|
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* of the License, or (at your option) any later version.
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*
|
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* This program is distributed in the hope that it will be useful,
|
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
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* GNU General Public License for more details.
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*
|
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* You should have received a copy of the GNU General Public License
|
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* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_LIBPCAP
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#ifdef HAVE_SYS_STAT_H
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# include <sys/stat.h>
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#endif
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#ifdef HAVE_SYS_WAIT_H
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# include <sys/wait.h>
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#endif
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#ifndef _WIN32
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/*
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* Define various POSIX macros (and, in the case of WCOREDUMP, non-POSIX
|
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* macros) on UNIX systems that don't have them.
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*/
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#ifndef WIFEXITED
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# define WIFEXITED(status) (((status) & 0177) == 0)
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#endif
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#ifndef WIFSTOPPED
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# define WIFSTOPPED(status) (((status) & 0177) == 0177)
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#endif
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#ifndef WIFSIGNALED
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# define WIFSIGNALED(status) (!WIFSTOPPED(status) && !WIFEXITED(status))
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#endif
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#ifndef WEXITSTATUS
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# define WEXITSTATUS(status) ((status) >> 8)
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#endif
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#ifndef WTERMSIG
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# define WTERMSIG(status) ((status) & 0177)
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#endif
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#ifndef WCOREDUMP
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# define WCOREDUMP(status) ((status) & 0200)
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#endif
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#ifndef WSTOPSIG
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# define WSTOPSIG(status) ((status) >> 8)
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#endif
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#endif /* _WIN32 */
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#ifdef HAVE_IO_H
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# include <io.h>
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#endif
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#include <gtk/gtk.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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|
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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|
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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|
#endif
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#include <time.h>
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#ifdef HAVE_SYS_IOCTL_H
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#include <sys/ioctl.h>
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#endif
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#include <signal.h>
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#include <errno.h>
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#include <pcap.h>
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#ifdef NEED_SNPRINTF_H
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# include "snprintf.h"
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#endif
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#ifdef _WIN32
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#include <process.h> /* For spawning child process */
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#endif
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/*
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* XXX - the various BSDs appear to define BSD in <sys/param.h>; we don't
|
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* want to include it if it's not present on this platform, however.
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*/
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#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__bsdi__) || defined(__APPLE__)
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#ifndef BSD
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#define BSD
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#endif /* BSD */
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#endif /* defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__bsdi__) || defined(__APPLE__) */
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/*
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* We don't want to do a "select()" on the pcap_t's file descriptor on
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* BSD (because "select()" doesn't work correctly on BPF devices on at
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* least some releases of some flavors of BSD), and we don't want to do
|
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* it on Windows (because "select()" is something for sockets, not for
|
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* arbitrary handles).
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*
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* We *do* want to do it on other platforms, as, on other platforms (with
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* the possible exception of Ultrix and Digital UNIX), the read timeout
|
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* doesn't expire if no packets have arrived, so a "pcap_dispatch()" call
|
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* will block until packets arrive, causing the UI to hang.
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*/
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#if !defined(BSD) && !defined(_WIN32)
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# define MUST_DO_SELECT
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#endif
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#include <epan/packet.h>
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#include "file.h"
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#include "capture.h"
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#include "util.h"
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#include "pcap-util.h"
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#include "simple_dialog.h"
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#include "prefs.h"
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#include "globals.h"
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#include "conditions.h"
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#include "capture_stop_conditions.h"
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#include "ringbuffer.h"
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#include "wiretap/libpcap.h"
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#include "wiretap/wtap.h"
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#include "wiretap/wtap-capture.h"
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#include "packet-atalk.h"
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#include "packet-atm.h"
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#include "packet-clip.h"
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#include "packet-eth.h"
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#include "packet-fddi.h"
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#include "packet-null.h"
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#include "packet-ppp.h"
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#include "packet-raw.h"
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#include "packet-sll.h"
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#include "packet-tr.h"
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#include "packet-ieee80211.h"
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#include "packet-chdlc.h"
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#include "packet-prism.h"
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#include "packet-ipfc.h"
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#include "packet-arcnet.h"
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#ifdef _WIN32
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#include "capture-wpcap.h"
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#endif
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/*
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* Capture options.
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*/
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capture_options capture_opts;
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static int sync_pipe[2]; /* used to sync father */
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enum PIPES { READ, WRITE }; /* Constants 0 and 1 for READ and WRITE */
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int quit_after_cap; /* Makes a "capture only mode". Implies -k */
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gboolean capture_child; /* if this is the child for "-S" */
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static int fork_child = -1; /* If not -1, in parent, process ID of child */
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static guint cap_input_id;
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/*
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* Indications sent out on the sync pipe.
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*/
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#define SP_CAPSTART ';' /* capture start message */
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#define SP_PACKET_COUNT '*' /* followed by count of packets captured since last message */
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#define SP_ERROR_MSG '!' /* followed by length of error message that follows */
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#define SP_DROPS '#' /* followed by count of packets dropped in capture */
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#ifdef _WIN32
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static guint cap_timer_id;
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static int cap_timer_cb(gpointer); /* Win32 kludge to check for pipe input */
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#endif
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static void cap_file_input_cb(gpointer, gint, GdkInputCondition);
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static void wait_for_child(gboolean);
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#ifndef _WIN32
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static char *signame(int);
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#endif
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static void capture_delete_cb(GtkWidget *, GdkEvent *, gpointer);
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static void capture_stop_cb(GtkWidget *, gpointer);
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static void capture_pcap_cb(guchar *, const struct pcap_pkthdr *,
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const guchar *);
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static void get_capture_file_io_error(char *, int, const char *, int, gboolean);
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static void popup_errmsg(const char *);
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static void send_errmsg_to_parent(const char *);
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static float pct(gint, gint);
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static void stop_capture(int signo);
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typedef struct _loop_data {
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gboolean go; /* TRUE as long as we're supposed to keep capturing */
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gint max; /* Number of packets we're supposed to capture - 0 means infinite */
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int err; /* if non-zero, error seen while capturing */
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gint linktype;
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gint sync_packets;
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gboolean pcap_err; /* TRUE if error from pcap */
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gboolean from_pipe; /* TRUE if we are capturing data from a pipe */
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packet_counts counts;
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wtap_dumper *pdh;
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#ifndef _WIN32
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gboolean modified; /* TRUE if data in the pipe uses modified pcap headers */
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gboolean byte_swapped; /* TRUE if data in the pipe is byte swapped */
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unsigned int bytes_to_read, bytes_read; /* Used by pipe_dispatch */
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enum {
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STATE_EXPECT_REC_HDR, STATE_READ_REC_HDR,
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STATE_EXPECT_DATA, STATE_READ_DATA
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} pipe_state;
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enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } pipe_err;
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#endif
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} loop_data;
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#ifndef _WIN32
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static void adjust_header(loop_data *, struct pcap_hdr *, struct pcaprec_hdr *);
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static int pipe_open_live(char *, struct pcap_hdr *, loop_data *, char *, int);
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static int pipe_dispatch(int, loop_data *, struct pcap_hdr *, \
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struct pcaprec_modified_hdr *, guchar *, char *, int);
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#endif
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/* Win32 needs the O_BINARY flag for open() */
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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|
|
#ifdef _WIN32
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|
/* Win32 needs a handle to the child capture process */
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|
int child_process;
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#endif
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|
/* Add a string pointer to a NULL-terminated array of string pointers. */
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static char **
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add_arg(char **args, int *argc, char *arg)
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{
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/* Grow the array; "*argc" currently contains the number of string
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pointers, *not* counting the NULL pointer at the end, so we have
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to add 2 in order to get the new size of the array, including the
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new pointer and the terminating NULL pointer. */
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args = g_realloc(args, (*argc + 2) * sizeof (char *));
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/* Stuff the pointer into the penultimate element of the array, which
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is the one at the index specified by "*argc". */
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args[*argc] = arg;
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/* Now bump the count. */
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(*argc)++;
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|
/* We overwrite the NULL pointer; put it back right after the
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element we added. */
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|
args[*argc] = NULL;
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return args;
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}
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|
#ifdef _WIN32
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|
/* Given a string, return a pointer to a quote-encapsulated version of
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the string, so we can pass it as an argument with "spawnvp" even
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if it contains blanks. */
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char *
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quote_encapsulate(const char *string)
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{
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char *encapsulated_string;
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encapsulated_string = g_new(char, strlen(string) + 3);
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sprintf(encapsulated_string, "\"%s\"", string);
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return encapsulated_string;
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}
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#endif
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|
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/* Open a specified file, or create a temporary file, and start a capture
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to the file in question. */
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void
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do_capture(const char *save_file)
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{
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char tmpname[128+1];
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gboolean is_tempfile;
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guchar c;
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int i;
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guint byte_count;
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char *msg;
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int err;
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int capture_succeeded;
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gboolean stats_known;
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struct pcap_stat stats;
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gchar *capfile_name;
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|
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if (save_file != NULL) {
|
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/* If the Sync option is set, we return to the caller while the capture
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* is in progress. Therefore we need to take a copy of save_file in
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* case the caller destroys it after we return.
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*/
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capfile_name = g_strdup(save_file);
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if (capture_opts.ringbuffer_on) {
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/* ringbuffer is enabled */
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cfile.save_file_fd = ringbuf_init(capfile_name,
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capture_opts.ringbuffer_num_files);
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} else {
|
|
/* Try to open/create the specified file for use as a capture buffer. */
|
|
cfile.save_file_fd = open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT,
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0600);
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|
}
|
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is_tempfile = FALSE;
|
|
} else {
|
|
/* Choose a random name for the capture buffer */
|
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cfile.save_file_fd = create_tempfile(tmpname, sizeof tmpname, "ether");
|
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capfile_name = g_strdup(tmpname);
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is_tempfile = TRUE;
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}
|
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if (cfile.save_file_fd == -1) {
|
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if (is_tempfile) {
|
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simple_dialog(ESD_TYPE_CRIT, NULL,
|
|
"The temporary file to which the capture would be saved (\"%s\")"
|
|
"could not be opened: %s.", capfile_name, strerror(errno));
|
|
} else {
|
|
if (capture_opts.ringbuffer_on) {
|
|
ringbuf_error_cleanup();
|
|
}
|
|
simple_dialog(ESD_TYPE_CRIT, NULL,
|
|
file_open_error_message(errno, TRUE, WTAP_FILE_PCAP), capfile_name);
|
|
}
|
|
g_free(capfile_name);
|
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return;
|
|
}
|
|
close_cap_file(&cfile);
|
|
g_assert(cfile.save_file == NULL);
|
|
cfile.save_file = capfile_name;
|
|
/* cfile.save_file is "g_free"ed below, which is equivalent to
|
|
"g_free(capfile_name)". */
|
|
|
|
if (capture_opts.sync_mode) { /* do the capture in a child process */
|
|
char ssnap[24];
|
|
char scount[24]; /* need a constant for len of numbers */
|
|
char sautostop_filesize[24]; /* need a constant for len of numbers */
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|
char sautostop_duration[24]; /* need a constant for len of numbers */
|
|
char save_file_fd[24];
|
|
char errmsg[1024+1];
|
|
int error;
|
|
int argc;
|
|
char **argv;
|
|
#ifdef _WIN32
|
|
char sync_pipe_fd[24];
|
|
char *fontstring;
|
|
char *filterstring;
|
|
#endif
|
|
|
|
/* Allocate the string pointer array with enough space for the
|
|
terminating NULL pointer. */
|
|
argc = 0;
|
|
argv = g_malloc(sizeof (char *));
|
|
*argv = NULL;
|
|
|
|
/* Now add those arguments used on all platforms. */
|
|
argv = add_arg(argv, &argc, CHILD_NAME);
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|
|
|
argv = add_arg(argv, &argc, "-i");
|
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argv = add_arg(argv, &argc, cfile.iface);
|
|
|
|
argv = add_arg(argv, &argc, "-w");
|
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argv = add_arg(argv, &argc, cfile.save_file);
|
|
|
|
argv = add_arg(argv, &argc, "-W");
|
|
sprintf(save_file_fd,"%d",cfile.save_file_fd); /* in lieu of itoa */
|
|
argv = add_arg(argv, &argc, save_file_fd);
|
|
|
|
if (capture_opts.has_autostop_count) {
|
|
argv = add_arg(argv, &argc, "-c");
|
|
sprintf(scount,"%d",capture_opts.autostop_count);
|
|
argv = add_arg(argv, &argc, scount);
|
|
}
|
|
|
|
if (capture_opts.has_snaplen) {
|
|
argv = add_arg(argv, &argc, "-s");
|
|
sprintf(ssnap,"%d",capture_opts.snaplen);
|
|
argv = add_arg(argv, &argc, ssnap);
|
|
}
|
|
|
|
if (capture_opts.has_autostop_filesize) {
|
|
argv = add_arg(argv, &argc, "-a");
|
|
sprintf(sautostop_filesize,"filesize:%d",capture_opts.autostop_filesize);
|
|
argv = add_arg(argv, &argc, sautostop_filesize);
|
|
}
|
|
|
|
if (capture_opts.has_autostop_duration) {
|
|
argv = add_arg(argv, &argc, "-a");
|
|
sprintf(sautostop_duration,"duration:%d",capture_opts.autostop_duration);
|
|
argv = add_arg(argv, &argc, sautostop_duration);
|
|
}
|
|
|
|
if (!capture_opts.promisc_mode)
|
|
argv = add_arg(argv, &argc, "-p");
|
|
|
|
#ifdef _WIN32
|
|
/* Create a pipe for the child process */
|
|
|
|
if(_pipe(sync_pipe, 512, O_BINARY) < 0) {
|
|
/* Couldn't create the pipe between parent and child. */
|
|
error = errno;
|
|
unlink(cfile.save_file);
|
|
g_free(cfile.save_file);
|
|
cfile.save_file = NULL;
|
|
simple_dialog(ESD_TYPE_CRIT, NULL, "Couldn't create sync pipe: %s",
|
|
strerror(error));
|
|
return;
|
|
}
|
|
|
|
/* Convert font name to a quote-encapsulated string and pass to child */
|
|
argv = add_arg(argv, &argc, "-m");
|
|
fontstring = quote_encapsulate(prefs.gui_font_name);
|
|
argv = add_arg(argv, &argc, fontstring);
|
|
|
|
/* Convert pipe write handle to a string and pass to child */
|
|
argv = add_arg(argv, &argc, "-Z");
|
|
itoa(sync_pipe[WRITE], sync_pipe_fd, 10);
|
|
argv = add_arg(argv, &argc, sync_pipe_fd);
|
|
|
|
/* Convert filter string to a quote delimited string and pass to child */
|
|
filterstring = NULL;
|
|
if (cfile.cfilter != NULL && strlen(cfile.cfilter) != 0) {
|
|
argv = add_arg(argv, &argc, "-f");
|
|
filterstring = quote_encapsulate(cfile.cfilter);
|
|
argv = add_arg(argv, &argc, filterstring);
|
|
}
|
|
|
|
/* Spawn process */
|
|
fork_child = spawnvp(_P_NOWAIT, ethereal_path, argv);
|
|
g_free(fontstring);
|
|
if (filterstring) {
|
|
g_free(filterstring);
|
|
}
|
|
/* Keep a copy for later evaluation by _cwait() */
|
|
child_process = fork_child;
|
|
#else
|
|
signal(SIGCHLD, SIG_IGN);
|
|
if (pipe(sync_pipe) < 0) {
|
|
/* Couldn't create the pipe between parent and child. */
|
|
error = errno;
|
|
unlink(cfile.save_file);
|
|
g_free(cfile.save_file);
|
|
cfile.save_file = NULL;
|
|
simple_dialog(ESD_TYPE_CRIT, NULL, "Couldn't create sync pipe: %s",
|
|
strerror(error));
|
|
return;
|
|
}
|
|
|
|
argv = add_arg(argv, &argc, "-m");
|
|
argv = add_arg(argv, &argc, prefs.gui_font_name);
|
|
|
|
if (cfile.cfilter != NULL && strlen(cfile.cfilter) != 0) {
|
|
argv = add_arg(argv, &argc, "-f");
|
|
argv = add_arg(argv, &argc, cfile.cfilter);
|
|
}
|
|
|
|
if ((fork_child = fork()) == 0) {
|
|
/*
|
|
* Child process - run Ethereal with the right arguments to make
|
|
* it just pop up the live capture dialog box and capture with
|
|
* the specified capture parameters, writing to the specified file.
|
|
*
|
|
* args: -i interface specification
|
|
* -w file to write
|
|
* -W file descriptor to write
|
|
* -c count to capture
|
|
* -s snaplen
|
|
* -m / -b fonts
|
|
* -f "filter expression"
|
|
*/
|
|
close(1);
|
|
dup(sync_pipe[WRITE]);
|
|
close(sync_pipe[READ]);
|
|
execvp(ethereal_path, argv);
|
|
snprintf(errmsg, sizeof errmsg, "Couldn't run %s in child process: %s",
|
|
ethereal_path, strerror(errno));
|
|
send_errmsg_to_parent(errmsg);
|
|
|
|
/* Exit with "_exit()", so that we don't close the connection
|
|
to the X server (and cause stuff buffered up by our parent but
|
|
not yet sent to be sent, as that stuff should only be sent by
|
|
our parent). */
|
|
_exit(2);
|
|
}
|
|
#endif
|
|
|
|
/* Parent process - read messages from the child process over the
|
|
sync pipe. */
|
|
g_free(argv); /* free up arg array */
|
|
|
|
/* Close the write side of the pipe, so that only the child has it
|
|
open, and thus it completely closes, and thus returns to us
|
|
an EOF indication, if the child closes it (either deliberately
|
|
or by exiting abnormally). */
|
|
close(sync_pipe[WRITE]);
|
|
|
|
/* Close the save file FD, as we won't be using it - we'll be opening
|
|
it and reading the save file through Wiretap. */
|
|
close(cfile.save_file_fd);
|
|
|
|
if (fork_child == -1) {
|
|
/* We couldn't even create the child process. */
|
|
error = errno;
|
|
close(sync_pipe[READ]);
|
|
unlink(cfile.save_file);
|
|
g_free(cfile.save_file);
|
|
cfile.save_file = NULL;
|
|
simple_dialog(ESD_TYPE_CRIT, NULL, "Couldn't create child process: %s",
|
|
strerror(error));
|
|
return;
|
|
}
|
|
|
|
/* Read a byte count from "sync_pipe[READ]", terminated with a
|
|
colon; if the count is 0, the child process created the
|
|
capture file and we should start reading from it, otherwise
|
|
the capture couldn't start and the count is a count of bytes
|
|
of error message, and we should display the message. */
|
|
byte_count = 0;
|
|
for (;;) {
|
|
i = read(sync_pipe[READ], &c, 1);
|
|
if (i == 0) {
|
|
/* EOF - the child process died.
|
|
Close the read side of the sync pipe, remove the capture file,
|
|
and report the failure. */
|
|
close(sync_pipe[READ]);
|
|
unlink(cfile.save_file);
|
|
g_free(cfile.save_file);
|
|
cfile.save_file = NULL;
|
|
wait_for_child(TRUE);
|
|
return;
|
|
}
|
|
if (c == SP_CAPSTART || c == SP_ERROR_MSG)
|
|
break;
|
|
if (!isdigit(c)) {
|
|
/* Child process handed us crap.
|
|
Close the read side of the sync pipe, remove the capture file,
|
|
and report the failure. */
|
|
close(sync_pipe[READ]);
|
|
unlink(cfile.save_file);
|
|
g_free(cfile.save_file);
|
|
cfile.save_file = NULL;
|
|
simple_dialog(ESD_TYPE_WARN, NULL,
|
|
"Capture child process sent us a bad message");
|
|
return;
|
|
}
|
|
byte_count = byte_count*10 + c - '0';
|
|
}
|
|
if (c == SP_CAPSTART) {
|
|
/* Success. Open the capture file, and set up to read it. */
|
|
err = start_tail_cap_file(cfile.save_file, is_tempfile, &cfile);
|
|
if (err == 0) {
|
|
/* We were able to open and set up to read the capture file;
|
|
arrange that our callback be called whenever it's possible
|
|
to read from the sync pipe, so that it's called when
|
|
the child process wants to tell us something. */
|
|
#ifdef _WIN32
|
|
/* Tricky to use pipes in win9x, as no concept of wait. NT can
|
|
do this but that doesn't cover all win32 platforms. GTK can do
|
|
this but doesn't seem to work over processes. Attempt to do
|
|
something similar here, start a timer and check for data on every
|
|
timeout. */
|
|
cap_timer_id = gtk_timeout_add(1000, cap_timer_cb, NULL);
|
|
#else
|
|
cap_input_id = gtk_input_add_full(sync_pipe[READ],
|
|
GDK_INPUT_READ|GDK_INPUT_EXCEPTION,
|
|
cap_file_input_cb,
|
|
NULL,
|
|
(gpointer) &cfile,
|
|
NULL);
|
|
#endif
|
|
} else {
|
|
/* We weren't able to open the capture file; user has been
|
|
alerted. Close the sync pipe. */
|
|
|
|
close(sync_pipe[READ]);
|
|
|
|
/* Don't unlink the save file - leave it around, for debugging
|
|
purposes. */
|
|
g_free(cfile.save_file);
|
|
cfile.save_file = NULL;
|
|
}
|
|
} else {
|
|
/* Failure - the child process sent us a message indicating
|
|
what the problem was. */
|
|
if (byte_count == 0) {
|
|
/* Zero-length message? */
|
|
simple_dialog(ESD_TYPE_WARN, NULL,
|
|
"Capture child process failed, but its error message was empty.");
|
|
} else {
|
|
msg = g_malloc(byte_count + 1);
|
|
if (msg == NULL) {
|
|
simple_dialog(ESD_TYPE_WARN, NULL,
|
|
"Capture child process failed, but its error message was too big.");
|
|
} else {
|
|
i = read(sync_pipe[READ], msg, byte_count);
|
|
msg[byte_count] = '\0';
|
|
if (i < 0) {
|
|
simple_dialog(ESD_TYPE_WARN, NULL,
|
|
"Capture child process failed: Error %s reading its error message.",
|
|
strerror(errno));
|
|
} else if (i == 0) {
|
|
simple_dialog(ESD_TYPE_WARN, NULL,
|
|
"Capture child process failed: EOF reading its error message.");
|
|
wait_for_child(FALSE);
|
|
} else
|
|
simple_dialog(ESD_TYPE_CRIT, NULL, msg);
|
|
g_free(msg);
|
|
}
|
|
|
|
/* Close the sync pipe. */
|
|
close(sync_pipe[READ]);
|
|
|
|
/* Get rid of the save file - the capture never started. */
|
|
unlink(cfile.save_file);
|
|
g_free(cfile.save_file);
|
|
cfile.save_file = NULL;
|
|
}
|
|
}
|
|
} else {
|
|
/* Not sync mode. */
|
|
capture_succeeded = capture(&stats_known, &stats);
|
|
if (quit_after_cap) {
|
|
/* DON'T unlink the save file. Presumably someone wants it. */
|
|
gtk_exit(0);
|
|
}
|
|
if (capture_succeeded) {
|
|
/* Capture succeeded; read in the capture file. */
|
|
if ((err = open_cap_file(cfile.save_file, is_tempfile, &cfile)) == 0) {
|
|
/* Set the read filter to NULL. */
|
|
cfile.rfcode = NULL;
|
|
|
|
/* Get the packet-drop statistics.
|
|
|
|
XXX - there are currently no packet-drop statistics stored
|
|
in libpcap captures, and that's what we're reading.
|
|
|
|
At some point, we will add support in Wiretap to return
|
|
packet-drop statistics for capture file formats that store it,
|
|
and will make "read_cap_file()" get those statistics from
|
|
Wiretap. We clear the statistics (marking them as "not known")
|
|
in "open_cap_file()", and "read_cap_file()" will only fetch
|
|
them and mark them as known if Wiretap supplies them, so if
|
|
we get the statistics now, after calling "open_cap_file()" but
|
|
before calling "read_cap_file()", the values we store will
|
|
be used by "read_cap_file()".
|
|
|
|
If a future libpcap capture file format stores the statistics,
|
|
we'll put them into the capture file that we write, and will
|
|
thus not have to set them here - "read_cap_file()" will get
|
|
them from the file and use them. */
|
|
if (stats_known) {
|
|
cfile.drops_known = TRUE;
|
|
|
|
/* XXX - on some systems, libpcap doesn't bother filling in
|
|
"ps_ifdrop" - it doesn't even set it to zero - so we don't
|
|
bother looking at it.
|
|
|
|
Ideally, libpcap would have an interface that gave us
|
|
several statistics - perhaps including various interface
|
|
error statistics - and would tell us which of them it
|
|
supplies, allowing us to display only the ones it does. */
|
|
cfile.drops = stats.ps_drop;
|
|
}
|
|
switch (read_cap_file(&cfile, &err)) {
|
|
|
|
case READ_SUCCESS:
|
|
case READ_ERROR:
|
|
/* Just because we got an error, that doesn't mean we were unable
|
|
to read any of the file; we handle what we could get from the
|
|
file. */
|
|
break;
|
|
|
|
case READ_ABORTED:
|
|
/* Exit by leaving the main loop, so that any quit functions
|
|
we registered get called. */
|
|
if (gtk_main_level() > 0)
|
|
gtk_main_quit();
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
/* We're not doing a capture any more, so we don't have a save
|
|
file. */
|
|
if (capture_opts.ringbuffer_on) {
|
|
ringbuf_free();
|
|
} else {
|
|
g_free(cfile.save_file);
|
|
}
|
|
cfile.save_file = NULL;
|
|
}
|
|
}
|
|
|
|
#ifdef _WIN32
|
|
/* The timer has expired, see if there's stuff to read from the pipe,
|
|
if so call the cap_file_input_cb */
|
|
static gint
|
|
cap_timer_cb(gpointer data)
|
|
{
|
|
HANDLE handle;
|
|
DWORD avail = 0;
|
|
gboolean result, result1;
|
|
DWORD childstatus;
|
|
|
|
/* Oddly enough although Named pipes don't work on win9x,
|
|
PeekNamedPipe does !!! */
|
|
handle = (HANDLE) _get_osfhandle (sync_pipe[READ]);
|
|
result = PeekNamedPipe(handle, NULL, 0, NULL, &avail, NULL);
|
|
|
|
/* Get the child process exit status */
|
|
result1 = GetExitCodeProcess((HANDLE)child_process, &childstatus);
|
|
|
|
/* If the Peek returned an error, or there are bytes to be read
|
|
or the childwatcher thread has terminated then call the normal
|
|
callback */
|
|
if (!result || avail > 0 || childstatus != STILL_ACTIVE) {
|
|
|
|
/* avoid reentrancy problems and stack overflow */
|
|
gtk_timeout_remove(cap_timer_id);
|
|
|
|
/* And call the real handler */
|
|
cap_file_input_cb((gpointer) &cfile, 0, 0);
|
|
|
|
/* Return false so that the timer is not run again */
|
|
return FALSE;
|
|
}
|
|
else {
|
|
/* No data so let timer run again */
|
|
return TRUE;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* There's stuff to read from the sync pipe, meaning the child has sent
|
|
us a message, or the sync pipe has closed, meaning the child has
|
|
closed it (perhaps because it exited). */
|
|
static void
|
|
cap_file_input_cb(gpointer data, gint source _U_,
|
|
GdkInputCondition condition _U_)
|
|
{
|
|
capture_file *cf = (capture_file *)data;
|
|
#define BUFSIZE 4096
|
|
char buffer[BUFSIZE+1], *p = buffer, *q = buffer, *msg, *r;
|
|
int nread, msglen, chars_to_copy;
|
|
int to_read = 0;
|
|
int err;
|
|
|
|
#ifndef _WIN32
|
|
/* avoid reentrancy problems and stack overflow */
|
|
gtk_input_remove(cap_input_id);
|
|
#endif
|
|
|
|
if ((nread = read(sync_pipe[READ], buffer, BUFSIZE)) <= 0) {
|
|
/* The child has closed the sync pipe, meaning it's not going to be
|
|
capturing any more packets. Pick up its exit status, and
|
|
complain if it did anything other than exit with status 0. */
|
|
wait_for_child(FALSE);
|
|
|
|
/* Read what remains of the capture file, and finish the capture.
|
|
XXX - do something if this fails? */
|
|
switch (finish_tail_cap_file(cf, &err)) {
|
|
|
|
case READ_SUCCESS:
|
|
case READ_ERROR:
|
|
/* Just because we got an error, that doesn't mean we were unable
|
|
to read any of the file; we handle what we could get from the
|
|
file. */
|
|
break;
|
|
|
|
case READ_ABORTED:
|
|
/* Exit by leaving the main loop, so that any quit functions
|
|
we registered get called. */
|
|
gtk_main_quit();
|
|
return;
|
|
}
|
|
|
|
/* We're not doing a capture any more, so we don't have a save
|
|
file. */
|
|
g_free(cf->save_file);
|
|
cf->save_file = NULL;
|
|
|
|
return;
|
|
}
|
|
|
|
buffer[nread] = '\0';
|
|
|
|
while (nread != 0) {
|
|
/* look for (possibly multiple) indications */
|
|
switch (*q) {
|
|
case SP_PACKET_COUNT :
|
|
to_read += atoi(p);
|
|
p = q + 1;
|
|
q++;
|
|
nread--;
|
|
break;
|
|
case SP_DROPS :
|
|
cf->drops_known = TRUE;
|
|
cf->drops = atoi(p);
|
|
p = q + 1;
|
|
q++;
|
|
nread--;
|
|
break;
|
|
case SP_ERROR_MSG :
|
|
msglen = atoi(p);
|
|
p = q + 1;
|
|
q++;
|
|
nread--;
|
|
|
|
/* Read the entire message.
|
|
XXX - if the child hasn't sent it all yet, this could cause us
|
|
to hang until they do. */
|
|
msg = g_malloc(msglen + 1);
|
|
r = msg;
|
|
while (msglen != 0) {
|
|
if (nread == 0) {
|
|
/* Read more. */
|
|
if ((nread = read(sync_pipe[READ], buffer, BUFSIZE)) <= 0)
|
|
break;
|
|
p = buffer;
|
|
q = buffer;
|
|
}
|
|
chars_to_copy = MIN(msglen, nread);
|
|
memcpy(r, q, chars_to_copy);
|
|
r += chars_to_copy;
|
|
q += chars_to_copy;
|
|
nread -= chars_to_copy;
|
|
msglen -= chars_to_copy;
|
|
}
|
|
*r = '\0';
|
|
simple_dialog(ESD_TYPE_CRIT, NULL, msg);
|
|
g_free(msg);
|
|
break;
|
|
default :
|
|
q++;
|
|
nread--;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Read from the capture file the number of records the child told us
|
|
it added.
|
|
XXX - do something if this fails? */
|
|
switch (continue_tail_cap_file(cf, to_read, &err)) {
|
|
|
|
case READ_SUCCESS:
|
|
case READ_ERROR:
|
|
/* Just because we got an error, that doesn't mean we were unable
|
|
to read any of the file; we handle what we could get from the
|
|
file.
|
|
|
|
XXX - abort on a read error? */
|
|
break;
|
|
|
|
case READ_ABORTED:
|
|
/* Kill the child capture process; the user wants to exit, and we
|
|
shouldn't just leave it running. */
|
|
#ifdef _WIN32
|
|
/* XXX - kill it. */
|
|
#else
|
|
kill(fork_child, SIGTERM); /* SIGTERM so it can clean up if necessary */
|
|
#endif
|
|
break;
|
|
}
|
|
|
|
/* restore pipe handler */
|
|
#ifdef _WIN32
|
|
cap_timer_id = gtk_timeout_add(1000, cap_timer_cb, NULL);
|
|
#else
|
|
cap_input_id = gtk_input_add_full (sync_pipe[READ],
|
|
GDK_INPUT_READ|GDK_INPUT_EXCEPTION,
|
|
cap_file_input_cb,
|
|
NULL,
|
|
(gpointer) cf,
|
|
NULL);
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
wait_for_child(gboolean always_report)
|
|
{
|
|
int wstatus;
|
|
|
|
#ifdef _WIN32
|
|
/* XXX - analyze the wait stuatus and display more information
|
|
in the dialog box? */
|
|
if (_cwait(&wstatus, child_process, _WAIT_CHILD) == -1) {
|
|
simple_dialog(ESD_TYPE_WARN, NULL, "Child capture process stopped unexpectedly");
|
|
}
|
|
#else
|
|
if (wait(&wstatus) != -1) {
|
|
if (WIFEXITED(wstatus)) {
|
|
/* The child exited; display its exit status, if it's not zero,
|
|
and even if it's zero if "always_report" is true. */
|
|
if (always_report || WEXITSTATUS(wstatus) != 0) {
|
|
simple_dialog(ESD_TYPE_WARN, NULL,
|
|
"Child capture process exited: exit status %d",
|
|
WEXITSTATUS(wstatus));
|
|
}
|
|
} else if (WIFSTOPPED(wstatus)) {
|
|
/* It stopped, rather than exiting. "Should not happen." */
|
|
simple_dialog(ESD_TYPE_WARN, NULL,
|
|
"Child capture process stopped: %s",
|
|
signame(WSTOPSIG(wstatus)));
|
|
} else if (WIFSIGNALED(wstatus)) {
|
|
/* It died with a signal. */
|
|
simple_dialog(ESD_TYPE_WARN, NULL,
|
|
"Child capture process died: %s%s",
|
|
signame(WTERMSIG(wstatus)),
|
|
WCOREDUMP(wstatus) ? " - core dumped" : "");
|
|
} else {
|
|
/* What? It had to either have exited, or stopped, or died with
|
|
a signal; what happened here? */
|
|
simple_dialog(ESD_TYPE_WARN, NULL,
|
|
"Child capture process died: wait status %#o", wstatus);
|
|
}
|
|
}
|
|
|
|
/* No more child process. */
|
|
fork_child = -1;
|
|
#endif
|
|
}
|
|
|
|
#ifndef _WIN32
|
|
static char *
|
|
signame(int sig)
|
|
{
|
|
char *sigmsg;
|
|
static char sigmsg_buf[6+1+3+1];
|
|
|
|
switch (sig) {
|
|
|
|
case SIGHUP:
|
|
sigmsg = "Hangup";
|
|
break;
|
|
|
|
case SIGINT:
|
|
sigmsg = "Interrupted";
|
|
break;
|
|
|
|
case SIGQUIT:
|
|
sigmsg = "Quit";
|
|
break;
|
|
|
|
case SIGILL:
|
|
sigmsg = "Illegal instruction";
|
|
break;
|
|
|
|
case SIGTRAP:
|
|
sigmsg = "Trace trap";
|
|
break;
|
|
|
|
case SIGABRT:
|
|
sigmsg = "Abort";
|
|
break;
|
|
|
|
case SIGFPE:
|
|
sigmsg = "Arithmetic exception";
|
|
break;
|
|
|
|
case SIGKILL:
|
|
sigmsg = "Killed";
|
|
break;
|
|
|
|
case SIGBUS:
|
|
sigmsg = "Bus error";
|
|
break;
|
|
|
|
case SIGSEGV:
|
|
sigmsg = "Segmentation violation";
|
|
break;
|
|
|
|
/* http://metalab.unc.edu/pub/Linux/docs/HOWTO/GCC-HOWTO
|
|
Linux is POSIX compliant. These are not POSIX-defined signals ---
|
|
ISO/IEC 9945-1:1990 (IEEE Std 1003.1-1990), paragraph B.3.3.1.1 sez:
|
|
|
|
``The signals SIGBUS, SIGEMT, SIGIOT, SIGTRAP, and SIGSYS
|
|
were omitted from POSIX.1 because their behavior is
|
|
implementation dependent and could not be adequately catego-
|
|
rized. Conforming implementations may deliver these sig-
|
|
nals, but must document the circumstances under which they
|
|
are delivered and note any restrictions concerning their
|
|
delivery.''
|
|
|
|
So we only check for SIGSYS on those systems that happen to
|
|
implement them (a system can be POSIX-compliant and implement
|
|
them, it's just that POSIX doesn't *require* a POSIX-compliant
|
|
system to implement them).
|
|
*/
|
|
|
|
#ifdef SIGSYS
|
|
case SIGSYS:
|
|
sigmsg = "Bad system call";
|
|
break;
|
|
#endif
|
|
|
|
case SIGPIPE:
|
|
sigmsg = "Broken pipe";
|
|
break;
|
|
|
|
case SIGALRM:
|
|
sigmsg = "Alarm clock";
|
|
break;
|
|
|
|
case SIGTERM:
|
|
sigmsg = "Terminated";
|
|
break;
|
|
|
|
default:
|
|
sprintf(sigmsg_buf, "Signal %d", sig);
|
|
sigmsg = sigmsg_buf;
|
|
break;
|
|
}
|
|
return sigmsg;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Timeout, in milliseconds, for reads from the stream of captured packets.
|
|
*/
|
|
#define CAP_READ_TIMEOUT 250
|
|
|
|
#ifndef _WIN32
|
|
/* Take care of byte order in the libpcap headers read from pipes.
|
|
* (function taken from wiretap/libpcap.c) */
|
|
static void
|
|
adjust_header(loop_data *ld, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
|
|
{
|
|
if (ld->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;
|
|
}
|
|
}
|
|
|
|
/* 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
|
|
pipe_open_live(char *pipename, struct pcap_hdr *hdr, loop_data *ld,
|
|
char *errmsg, int errmsgl)
|
|
{
|
|
struct stat pipe_stat;
|
|
int fd;
|
|
guint32 magic;
|
|
int b, sel_ret;
|
|
unsigned int bytes_read;
|
|
fd_set rfds;
|
|
struct timeval timeout;
|
|
|
|
/*
|
|
* XXX Ethereal blocks until we return
|
|
*/
|
|
if (strcmp(pipename, "-") == 0)
|
|
fd = 0; /* read from stdin */
|
|
else {
|
|
if (stat(pipename, &pipe_stat) < 0) {
|
|
if (errno == ENOENT || errno == ENOTDIR)
|
|
ld->pipe_err = PIPNEXIST;
|
|
else {
|
|
snprintf(errmsg, errmsgl,
|
|
"The capture session could not be initiated "
|
|
"due to error on pipe: %s", strerror(errno));
|
|
ld->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->pipe_err = PIPNEXIST;
|
|
} else {
|
|
snprintf(errmsg, errmsgl,
|
|
"The capture session could not be initiated because\n"
|
|
"\"%s\" is neither an interface nor a pipe", pipename);
|
|
ld->pipe_err = PIPERR;
|
|
}
|
|
return -1;
|
|
}
|
|
fd = open(pipename, O_RDONLY | O_NONBLOCK);
|
|
if (fd == -1) {
|
|
snprintf(errmsg, errmsgl,
|
|
"The capture session could not be initiated "
|
|
"due to error on pipe open: %s", strerror(errno));
|
|
ld->pipe_err = PIPERR;
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
ld->from_pipe = TRUE;
|
|
|
|
/* read the pcap header */
|
|
FD_ZERO(&rfds);
|
|
bytes_read = 0;
|
|
while (bytes_read < sizeof magic) {
|
|
FD_SET(fd, &rfds);
|
|
timeout.tv_sec = 0;
|
|
timeout.tv_usec = CAP_READ_TIMEOUT*1000;
|
|
sel_ret = select(fd+1, &rfds, NULL, NULL, &timeout);
|
|
if (sel_ret < 0) {
|
|
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)
|
|
snprintf(errmsg, errmsgl, "End of file on pipe during open");
|
|
else
|
|
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->byte_swapped = FALSE;
|
|
ld->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->byte_swapped = FALSE;
|
|
ld->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->byte_swapped = TRUE;
|
|
ld->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->byte_swapped = TRUE;
|
|
ld->modified = TRUE;
|
|
break;
|
|
default:
|
|
/* Not a "libpcap" type we know about. */
|
|
snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
|
|
goto error;
|
|
}
|
|
|
|
/* Read the rest of the header */
|
|
bytes_read = 0;
|
|
while (bytes_read < sizeof(struct pcap_hdr)) {
|
|
FD_SET(fd, &rfds);
|
|
timeout.tv_sec = 0;
|
|
timeout.tv_usec = CAP_READ_TIMEOUT*1000;
|
|
sel_ret = select(fd+1, &rfds, NULL, NULL, &timeout);
|
|
if (sel_ret < 0) {
|
|
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)
|
|
snprintf(errmsg, errmsgl, "End of file on pipe during open");
|
|
else
|
|
snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
|
|
strerror(errno));
|
|
goto error;
|
|
}
|
|
bytes_read += b;
|
|
}
|
|
}
|
|
|
|
if (ld->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);
|
|
}
|
|
|
|
if (hdr->version_major < 2) {
|
|
snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
|
|
goto error;
|
|
}
|
|
|
|
ld->pipe_state = STATE_EXPECT_REC_HDR;
|
|
ld->pipe_err = PIPOK;
|
|
return fd;
|
|
|
|
error:
|
|
ld->pipe_err = PIPERR;
|
|
close(fd);
|
|
return -1;
|
|
|
|
}
|
|
|
|
/* We read one record from the pipe, take care of byte order in the record
|
|
* header, write the record in the capture file, and update capture statistics. */
|
|
|
|
static int
|
|
pipe_dispatch(int fd, loop_data *ld, struct pcap_hdr *hdr,
|
|
struct pcaprec_modified_hdr *rechdr, 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;
|
|
|
|
switch (ld->pipe_state) {
|
|
|
|
case STATE_EXPECT_REC_HDR:
|
|
ld->bytes_to_read = ld->modified ?
|
|
sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
|
|
ld->bytes_read = 0;
|
|
ld->pipe_state = STATE_READ_REC_HDR;
|
|
/* Fall through */
|
|
|
|
case STATE_READ_REC_HDR:
|
|
b = read(fd, ((char *)rechdr)+ld->bytes_read,
|
|
ld->bytes_to_read - ld->bytes_read);
|
|
if (b <= 0) {
|
|
if (b == 0)
|
|
result = PD_PIPE_EOF;
|
|
else
|
|
result = PD_PIPE_ERR;
|
|
break;
|
|
}
|
|
if ((ld->bytes_read += b) < ld->bytes_to_read)
|
|
return 0;
|
|
result = PD_REC_HDR_READ;
|
|
break;
|
|
|
|
case STATE_EXPECT_DATA:
|
|
ld->bytes_read = 0;
|
|
ld->pipe_state = STATE_READ_DATA;
|
|
/* Fall through */
|
|
|
|
case STATE_READ_DATA:
|
|
b = read(fd, data+ld->bytes_read, rechdr->hdr.incl_len - ld->bytes_read);
|
|
if (b <= 0) {
|
|
if (b == 0)
|
|
result = PD_PIPE_EOF;
|
|
else
|
|
result = PD_PIPE_ERR;
|
|
break;
|
|
}
|
|
if ((ld->bytes_read += b) < rechdr->hdr.incl_len)
|
|
return 0;
|
|
result = PD_DATA_READ;
|
|
break;
|
|
|
|
default:
|
|
snprintf(errmsg, errmsgl, "pipe_dispatch: invalid state");
|
|
result = PD_ERR;
|
|
|
|
} /* switch (ld->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. */
|
|
adjust_header(ld, hdr, &rechdr->hdr);
|
|
if (rechdr->hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
|
|
snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
|
|
ld->counts.total+1, rechdr->hdr.incl_len);
|
|
break;
|
|
}
|
|
ld->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 = rechdr->hdr.ts_sec;
|
|
phdr.ts.tv_usec = rechdr->hdr.ts_usec;
|
|
phdr.caplen = rechdr->hdr.incl_len;
|
|
phdr.len = rechdr->hdr.orig_len;
|
|
|
|
capture_pcap_cb((guchar *)ld, &phdr, data);
|
|
|
|
ld->pipe_state = STATE_EXPECT_REC_HDR;
|
|
return 1;
|
|
|
|
case PD_PIPE_EOF:
|
|
ld->pipe_err = PIPEOF;
|
|
return -1;
|
|
|
|
case PD_PIPE_ERR:
|
|
snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
|
|
strerror(errno));
|
|
/* Fall through */
|
|
case PD_ERR:
|
|
break;
|
|
}
|
|
|
|
ld->pipe_err = PIPERR;
|
|
/* Return here rather than inside the switch to prevent GCC warning */
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* This needs to be static, so that the SIGUSR1 handler can clear the "go"
|
|
* flag.
|
|
*/
|
|
static loop_data ld;
|
|
|
|
/* Do the low-level work of a capture.
|
|
Returns TRUE if it succeeds, FALSE otherwise. */
|
|
int
|
|
capture(gboolean *stats_known, struct pcap_stat *stats)
|
|
{
|
|
GtkWidget *cap_w, *main_vb, *stop_bt, *counts_tb;
|
|
GtkWidget *counts_fr, *running_tb, *running_label, *running_time;
|
|
pcap_t *pch;
|
|
int pcap_encap;
|
|
int file_snaplen;
|
|
gchar open_err_str[PCAP_ERRBUF_SIZE];
|
|
gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
|
|
gchar label_str[64];
|
|
bpf_u_int32 netnum, netmask;
|
|
struct bpf_program fcode;
|
|
time_t upd_time, cur_time;
|
|
time_t start_time;
|
|
int err, inpkts;
|
|
condition *cnd_stop_capturesize = NULL;
|
|
condition *cnd_stop_timeout = NULL;
|
|
unsigned int i;
|
|
static const char capstart_msg = SP_CAPSTART;
|
|
char errmsg[4096+1];
|
|
gboolean write_ok;
|
|
gboolean close_ok;
|
|
fd_set set1;
|
|
struct timeval timeout;
|
|
struct {
|
|
const gchar *title;
|
|
gint *value_ptr;
|
|
GtkWidget *label, *value, *percent;
|
|
} counts[] = {
|
|
{ "Total", &ld.counts.total, NULL, NULL, NULL },
|
|
{ "SCTP", &ld.counts.sctp, NULL, NULL, NULL },
|
|
{ "TCP", &ld.counts.tcp, NULL, NULL, NULL },
|
|
{ "UDP", &ld.counts.udp, NULL, NULL, NULL },
|
|
{ "ICMP", &ld.counts.icmp, NULL, NULL, NULL },
|
|
{ "ARP", &ld.counts.arp, NULL, NULL, NULL },
|
|
{ "OSPF", &ld.counts.ospf, NULL, NULL, NULL },
|
|
{ "GRE", &ld.counts.gre, NULL, NULL, NULL },
|
|
{ "NetBIOS", &ld.counts.netbios, NULL, NULL, NULL },
|
|
{ "IPX", &ld.counts.ipx, NULL, NULL, NULL },
|
|
{ "VINES", &ld.counts.vines, NULL, NULL, NULL },
|
|
{ "Other", &ld.counts.other, NULL, NULL, NULL }
|
|
};
|
|
|
|
#define N_COUNTS (sizeof counts / sizeof counts[0])
|
|
|
|
#ifdef _WIN32
|
|
WORD wVersionRequested;
|
|
WSADATA wsaData;
|
|
#else
|
|
static const char ppamsg[] = "can't find PPA for ";
|
|
char *libpcap_warn;
|
|
int sel_ret;
|
|
int pipe_fd = -1;
|
|
struct pcap_hdr hdr;
|
|
struct pcaprec_modified_hdr rechdr;
|
|
guchar pcap_data[WTAP_MAX_PACKET_SIZE];
|
|
#endif
|
|
#ifdef MUST_DO_SELECT
|
|
int pcap_fd = 0;
|
|
#endif
|
|
|
|
/* Size of buffer to hold decimal representation of
|
|
signed/unsigned 64-bit int */
|
|
#define DECISIZE 20
|
|
|
|
/* Initialize Windows Socket if we are in a WIN32 OS
|
|
This needs to be done before querying the interface for network/netmask */
|
|
#ifdef _WIN32
|
|
wVersionRequested = MAKEWORD( 1, 1 );
|
|
err = WSAStartup( wVersionRequested, &wsaData );
|
|
if (err!=0) {
|
|
snprintf(errmsg, sizeof errmsg,
|
|
"Couldn't initialize Windows Sockets.");
|
|
pch=NULL;
|
|
goto error;
|
|
}
|
|
#endif
|
|
|
|
ld.go = TRUE;
|
|
ld.counts.total = 0;
|
|
if (capture_opts.has_autostop_count)
|
|
ld.max = capture_opts.autostop_count;
|
|
else
|
|
ld.max = 0; /* no limit */
|
|
ld.err = 0; /* no error seen yet */
|
|
ld.linktype = WTAP_ENCAP_UNKNOWN;
|
|
ld.pcap_err = FALSE;
|
|
ld.from_pipe = FALSE;
|
|
ld.sync_packets = 0;
|
|
ld.counts.sctp = 0;
|
|
ld.counts.tcp = 0;
|
|
ld.counts.udp = 0;
|
|
ld.counts.icmp = 0;
|
|
ld.counts.ospf = 0;
|
|
ld.counts.gre = 0;
|
|
ld.counts.ipx = 0;
|
|
ld.counts.netbios = 0;
|
|
ld.counts.vines = 0;
|
|
ld.counts.other = 0;
|
|
ld.counts.arp = 0;
|
|
ld.pdh = NULL;
|
|
|
|
/* We haven't yet gotten the capture statistics. */
|
|
*stats_known = FALSE;
|
|
|
|
/* 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';
|
|
pch = pcap_open_live(cfile.iface,
|
|
capture_opts.has_snaplen ? capture_opts.snaplen :
|
|
WTAP_MAX_PACKET_SIZE,
|
|
capture_opts.promisc_mode, CAP_READ_TIMEOUT,
|
|
open_err_str);
|
|
|
|
if (pch == NULL) {
|
|
/* We couldn't open "cfile.iface" as a network device. */
|
|
#ifdef _WIN32
|
|
/* On Windows, we don't support capturing on pipes, so we give up.
|
|
If this is a child process that does the capturing in sync
|
|
mode or fork mode, it shouldn't do any UI stuff until we pop up the
|
|
capture-progress window, and, since we couldn't start the
|
|
capture, we haven't popped it up. */
|
|
if (!capture_child) {
|
|
while (gtk_events_pending()) gtk_main_iteration();
|
|
}
|
|
|
|
/* On Win32 OSes, the capture devices are probably available to all
|
|
users; don't warn about permissions problems.
|
|
|
|
Do, however, warn that WAN devices aren't supported. */
|
|
snprintf(errmsg, sizeof errmsg,
|
|
"The capture session could not be initiated (%s).\n"
|
|
"Please check that you have the proper interface specified.\n"
|
|
"\n"
|
|
"Note that the driver Ethereal uses for packet capture on Windows doesn't\n"
|
|
"support capturing on PPP/WAN interfaces in Windows NT/2000/XP/.NET Server.\n",
|
|
open_err_str);
|
|
goto error;
|
|
#else
|
|
/* try to open cfile.iface as a pipe */
|
|
pipe_fd = pipe_open_live(cfile.iface, &hdr, &ld, errmsg, sizeof errmsg);
|
|
|
|
if (pipe_fd == -1) {
|
|
|
|
/* If this is a child process that does the capturing in sync
|
|
* mode or fork mode, it shouldn't do any UI stuff until we pop up the
|
|
* capture-progress window, and, since we couldn't start the
|
|
* capture, we haven't popped it up.
|
|
*/
|
|
if (!capture_child) {
|
|
while (gtk_events_pending()) gtk_main_iteration();
|
|
}
|
|
|
|
if (ld.pipe_err == PIPNEXIST) {
|
|
/* Pipe doesn't exist, so output message for interface */
|
|
|
|
/* If we got a "can't find PPA for XXX" message, warn the user (who
|
|
is running Ethereal 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 XXX" rather than "can't find PPA for XXX"). */
|
|
if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
|
|
libpcap_warn =
|
|
"\n\n"
|
|
"You are running Ethereal with a version of the libpcap library\n"
|
|
"that doesn't handle HP-UX network devices well; this means that\n"
|
|
"Ethereal 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 = "";
|
|
snprintf(errmsg, sizeof errmsg,
|
|
"The capture session could not be initiated (%s).\n"
|
|
"Please check to make sure you have sufficient permissions, and that\n"
|
|
"you have the proper interface or pipe specified.%s", open_err_str,
|
|
libpcap_warn);
|
|
}
|
|
/*
|
|
* Else pipe (or file) does exist and pipe_open_live() has
|
|
* filled in errmsg
|
|
*/
|
|
goto error;
|
|
} else
|
|
/* pipe_open_live() succeeded; don't want
|
|
error message from pcap_open_live() */
|
|
open_err_str[0] = '\0';
|
|
#endif
|
|
}
|
|
|
|
/* capture filters only work on real interfaces */
|
|
if (cfile.cfilter && !ld.from_pipe) {
|
|
/* A capture filter was specified; set it up. */
|
|
if (pcap_lookupnet(cfile.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).
|
|
*/
|
|
netmask = 0;
|
|
}
|
|
if (pcap_compile(pch, &fcode, cfile.cfilter, 1, netmask) < 0) {
|
|
snprintf(errmsg, sizeof errmsg, "Unable to parse filter string (%s).",
|
|
pcap_geterr(pch));
|
|
goto error;
|
|
}
|
|
if (pcap_setfilter(pch, &fcode) < 0) {
|
|
snprintf(errmsg, sizeof errmsg, "Can't install filter (%s).",
|
|
pcap_geterr(pch));
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
/* Set up to write to the capture file. */
|
|
#ifndef _WIN32
|
|
if (ld.from_pipe) {
|
|
pcap_encap = hdr.network;
|
|
file_snaplen = hdr.snaplen;
|
|
} else
|
|
#endif
|
|
{
|
|
pcap_encap = get_pcap_linktype(pch, cfile.iface);
|
|
file_snaplen = pcap_snapshot(pch);
|
|
}
|
|
ld.linktype = wtap_pcap_encap_to_wtap_encap(pcap_encap);
|
|
if (ld.linktype == WTAP_ENCAP_UNKNOWN) {
|
|
snprintf(errmsg, sizeof errmsg,
|
|
"The network you're capturing from is of a type"
|
|
" that Ethereal doesn't support (data link type %d).", pcap_encap);
|
|
goto error;
|
|
}
|
|
if (capture_opts.ringbuffer_on) {
|
|
ld.pdh = ringbuf_init_wtap_dump_fdopen(WTAP_FILE_PCAP, ld.linktype,
|
|
file_snaplen, &err);
|
|
} else {
|
|
ld.pdh = wtap_dump_fdopen(cfile.save_file_fd, WTAP_FILE_PCAP,
|
|
ld.linktype, file_snaplen, &err);
|
|
}
|
|
|
|
if (ld.pdh == NULL) {
|
|
/* We couldn't set up to write to the capture file. */
|
|
switch (err) {
|
|
|
|
case WTAP_ERR_CANT_OPEN:
|
|
strcpy(errmsg, "The file to which the capture would be saved"
|
|
" couldn't be created for some unknown reason.");
|
|
break;
|
|
|
|
case WTAP_ERR_SHORT_WRITE:
|
|
strcpy(errmsg, "A full header couldn't be written to the file"
|
|
" to which the capture would be saved.");
|
|
break;
|
|
|
|
default:
|
|
if (err < 0) {
|
|
snprintf(errmsg, sizeof(errmsg),
|
|
"The file to which the capture would be"
|
|
" saved (\"%s\") could not be opened: Error %d.",
|
|
cfile.save_file, err);
|
|
} else {
|
|
snprintf(errmsg, sizeof(errmsg),
|
|
"The file to which the capture would be"
|
|
" saved (\"%s\") could not be opened: %s.",
|
|
cfile.save_file, strerror(err));
|
|
}
|
|
break;
|
|
}
|
|
goto error;
|
|
}
|
|
|
|
/* 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')
|
|
g_warning("%s.", open_err_str);
|
|
|
|
/* 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. */
|
|
|
|
if (capture_child) {
|
|
/* Well, we should be able to start capturing.
|
|
|
|
This is the child process for a sync mode capture, so 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. */
|
|
fflush(wtap_dump_file(ld.pdh));
|
|
write(1, &capstart_msg, 1);
|
|
}
|
|
|
|
cap_w = gtk_window_new(GTK_WINDOW_TOPLEVEL);
|
|
gtk_window_set_title(GTK_WINDOW(cap_w), "Ethereal: Capture");
|
|
gtk_window_set_modal(GTK_WINDOW(cap_w), TRUE);
|
|
|
|
/* Container for capture display widgets */
|
|
main_vb = gtk_vbox_new(FALSE, 1);
|
|
gtk_container_border_width(GTK_CONTAINER(main_vb), 5);
|
|
gtk_container_add(GTK_CONTAINER(cap_w), main_vb);
|
|
gtk_widget_show(main_vb);
|
|
|
|
counts_fr = gtk_frame_new("Captured Frames");
|
|
gtk_box_pack_start(GTK_BOX(main_vb), counts_fr, FALSE, FALSE, 3);
|
|
gtk_widget_show(counts_fr);
|
|
|
|
/* Individual statistic elements */
|
|
counts_tb = gtk_table_new(N_COUNTS, 3, TRUE);
|
|
gtk_container_add(GTK_CONTAINER(counts_fr), counts_tb);
|
|
gtk_container_border_width(GTK_CONTAINER(counts_tb), 5);
|
|
gtk_widget_show(counts_tb);
|
|
|
|
for (i = 0; i < N_COUNTS; i++) {
|
|
counts[i].label = gtk_label_new(counts[i].title);
|
|
gtk_misc_set_alignment(GTK_MISC(counts[i].label), 0.0f, 0.0f);
|
|
|
|
counts[i].value = gtk_label_new("0");
|
|
gtk_misc_set_alignment(GTK_MISC(counts[i].value), 0.0f, 0.0f);
|
|
|
|
counts[i].percent = gtk_label_new("0.0%");
|
|
gtk_misc_set_alignment(GTK_MISC(counts[i].percent), 0.0f, 0.0f);
|
|
|
|
gtk_table_attach_defaults(GTK_TABLE(counts_tb),
|
|
counts[i].label, 0, 1, i, i + 1);
|
|
|
|
gtk_table_attach(GTK_TABLE(counts_tb),
|
|
counts[i].value,
|
|
1, 2, i, i + 1, 0, 0, 5, 0);
|
|
|
|
gtk_table_attach_defaults(GTK_TABLE(counts_tb),
|
|
counts[i].percent, 2, 3, i, i + 1);
|
|
|
|
gtk_widget_show(counts[i].label);
|
|
gtk_widget_show(counts[i].value);
|
|
gtk_widget_show(counts[i].percent);
|
|
}
|
|
|
|
/* Running time */
|
|
running_tb = gtk_table_new(1, 3, TRUE);
|
|
gtk_box_pack_start(GTK_BOX(main_vb), running_tb, FALSE, FALSE, 3);
|
|
gtk_widget_show(running_tb);
|
|
|
|
running_label = gtk_label_new("Running");
|
|
gtk_misc_set_alignment(GTK_MISC(running_label), 0.0f, 0.0f);
|
|
gtk_widget_show(running_label);
|
|
gtk_table_attach_defaults(GTK_TABLE(running_tb),
|
|
running_label, 0, 1, 0, 1);
|
|
|
|
running_time = gtk_label_new("00:00:00");
|
|
gtk_misc_set_alignment(GTK_MISC(running_time), 0.0f, 0.0f);
|
|
gtk_widget_show(running_time);
|
|
gtk_table_attach(GTK_TABLE(running_tb),
|
|
running_time,
|
|
1, 2, 0, 1, 0, 0, 5, 0);
|
|
|
|
/* allow user to either click a stop button, or the close button on
|
|
the window to stop a capture in progress. */
|
|
stop_bt = gtk_button_new_with_label ("Stop");
|
|
gtk_signal_connect(GTK_OBJECT(stop_bt), "clicked",
|
|
GTK_SIGNAL_FUNC(capture_stop_cb), (gpointer) &ld);
|
|
gtk_signal_connect(GTK_OBJECT(cap_w), "delete_event",
|
|
GTK_SIGNAL_FUNC(capture_delete_cb), (gpointer) &ld);
|
|
gtk_box_pack_start(GTK_BOX(main_vb), stop_bt, FALSE, FALSE, 3);
|
|
GTK_WIDGET_SET_FLAGS(stop_bt, GTK_CAN_DEFAULT);
|
|
gtk_widget_grab_default(stop_bt);
|
|
GTK_WIDGET_SET_FLAGS(stop_bt, GTK_CAN_DEFAULT);
|
|
gtk_widget_grab_default(stop_bt);
|
|
gtk_widget_show(stop_bt);
|
|
|
|
gtk_widget_show(cap_w);
|
|
|
|
start_time = time(NULL);
|
|
upd_time = time(NULL);
|
|
#ifdef MUST_DO_SELECT
|
|
if (!ld.from_pipe) pcap_fd = pcap_fileno(pch);
|
|
#endif
|
|
|
|
#ifndef _WIN32
|
|
/*
|
|
* Catch SIGUSR1, so that we exit cleanly if the parent process
|
|
* kills us with it due to the user selecting "Capture->Stop".
|
|
*/
|
|
if (capture_child)
|
|
signal(SIGUSR1, stop_capture);
|
|
#endif
|
|
/* initialize capture stop conditions */
|
|
init_capture_stop_conditions();
|
|
/* create stop conditions */
|
|
if (capture_opts.has_autostop_filesize)
|
|
cnd_stop_capturesize =
|
|
cnd_new(CND_CLASS_CAPTURESIZE,(long)capture_opts.autostop_filesize * 1000);
|
|
if (capture_opts.has_autostop_duration)
|
|
cnd_stop_timeout =
|
|
cnd_new(CND_CLASS_TIMEOUT,(gint32)capture_opts.autostop_duration);
|
|
|
|
while (ld.go) {
|
|
while (gtk_events_pending()) gtk_main_iteration();
|
|
|
|
#ifndef _WIN32
|
|
if (ld.from_pipe) {
|
|
FD_ZERO(&set1);
|
|
FD_SET(pipe_fd, &set1);
|
|
timeout.tv_sec = 0;
|
|
timeout.tv_usec = CAP_READ_TIMEOUT*1000;
|
|
sel_ret = select(pipe_fd+1, &set1, NULL, NULL, &timeout);
|
|
if (sel_ret <= 0) {
|
|
inpkts = 0;
|
|
if (sel_ret < 0 && errno != EINTR) {
|
|
snprintf(errmsg, sizeof(errmsg),
|
|
"Unexpected error from select: %s", strerror(errno));
|
|
popup_errmsg(errmsg);
|
|
ld.go = FALSE;
|
|
}
|
|
} else {
|
|
/*
|
|
* "select()" says we can read from the pipe without blocking
|
|
*/
|
|
inpkts = pipe_dispatch(pipe_fd, &ld, &hdr, &rechdr, pcap_data,
|
|
errmsg, sizeof errmsg);
|
|
if (inpkts < 0) {
|
|
ld.go = FALSE;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
#ifdef MUST_DO_SELECT
|
|
/*
|
|
* Sigh. The semantics of the read timeout argument to
|
|
* "pcap_open_live()" aren't particularly well specified by
|
|
* the "pcap" man page - at least with the BSD BPF code, the
|
|
* intent appears to be, at least in part, a way of cutting
|
|
* down the number of reads done on a capture, by blocking
|
|
* until the buffer fills or a timer expires - and the Linux
|
|
* libpcap doesn't actually support it, so we can't use it
|
|
* to break out of the "pcap_dispatch()" every 1/4 of a second
|
|
* or so. Linux's libpcap is not the only libpcap that doesn't
|
|
* support the read timeout.
|
|
*
|
|
* Furthermore, at least on Solaris, the bufmod STREAMS module's
|
|
* read timeout won't go off if no data has arrived, i.e. it cannot
|
|
* be used to guarantee that a read from a DLPI stream will return
|
|
* within a specified amount of time regardless of whether any
|
|
* data arrives or not.
|
|
*
|
|
* Thus, on all platforms other than BSD, we do a "select()" on the
|
|
* file descriptor for the capture, with a timeout of CAP_READ_TIMEOUT
|
|
* milliseconds, or CAP_READ_TIMEOUT*1000 microseconds.
|
|
*
|
|
* "select()", on BPF devices, doesn't work as you might expect;
|
|
* at least on some versions of some flavors of BSD, the timer
|
|
* doesn't start until a read is done, so it won't expire if
|
|
* only a "select()" or "poll()" is posted.
|
|
*/
|
|
FD_ZERO(&set1);
|
|
FD_SET(pcap_fd, &set1);
|
|
timeout.tv_sec = 0;
|
|
timeout.tv_usec = CAP_READ_TIMEOUT*1000;
|
|
sel_ret = select(pcap_fd+1, &set1, NULL, NULL, &timeout);
|
|
if (sel_ret > 0) {
|
|
/*
|
|
* "select()" says we can read from it without blocking; go for
|
|
* it.
|
|
*/
|
|
inpkts = pcap_dispatch(pch, 1, capture_pcap_cb, (guchar *) &ld);
|
|
if (inpkts < 0) {
|
|
ld.pcap_err = TRUE;
|
|
ld.go = FALSE;
|
|
}
|
|
} else {
|
|
inpkts = 0;
|
|
if (sel_ret < 0 && errno != EINTR) {
|
|
snprintf(errmsg, sizeof(errmsg),
|
|
"Unexpected error from select: %s", strerror(errno));
|
|
popup_errmsg(errmsg);
|
|
ld.go = FALSE;
|
|
}
|
|
}
|
|
#else
|
|
inpkts = pcap_dispatch(pch, 1, capture_pcap_cb, (guchar *) &ld);
|
|
if (inpkts < 0) {
|
|
ld.pcap_err = TRUE;
|
|
ld.go = FALSE;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
if (inpkts > 0) {
|
|
ld.sync_packets += inpkts;
|
|
/* check capture stop conditons */
|
|
if (cnd_stop_capturesize != NULL && cnd_eval(cnd_stop_capturesize,
|
|
(guint32)wtap_get_bytes_dumped(ld.pdh))){
|
|
/* Capture file reached its maximum size. */
|
|
if (capture_opts.ringbuffer_on) {
|
|
/* Switch to the next ringbuffer file */
|
|
if (ringbuf_switch_file(&cfile, &ld.pdh, &ld.err)) {
|
|
/* File switch succeeded: reset the condition */
|
|
cnd_reset(cnd_stop_capturesize);
|
|
} else {
|
|
/* File switch failed: stop here */
|
|
ld.go = FALSE;
|
|
continue;
|
|
}
|
|
} else {
|
|
/* no ringbuffer - just stop */
|
|
ld.go = FALSE;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Only update once a second so as not to overload slow displays */
|
|
cur_time = time(NULL);
|
|
if (cur_time > upd_time) {
|
|
upd_time = cur_time;
|
|
|
|
/* calculate and display running time */
|
|
cur_time -= start_time;
|
|
snprintf(label_str, sizeof(label_str), "%02ld:%02ld:%02ld",
|
|
(long)(cur_time/3600), (long)((cur_time%3600)/60),
|
|
(long)(cur_time%60));
|
|
gtk_label_set(GTK_LABEL(running_time), label_str);
|
|
|
|
if (ld.sync_packets) {
|
|
|
|
for (i = 0; i < N_COUNTS; i++) {
|
|
snprintf(label_str, sizeof(label_str), "%d",
|
|
*counts[i].value_ptr);
|
|
|
|
gtk_label_set(GTK_LABEL(counts[i].value), label_str);
|
|
|
|
snprintf(label_str, sizeof(label_str), "(%.1f%%)",
|
|
pct(*counts[i].value_ptr, ld.counts.total));
|
|
|
|
gtk_label_set(GTK_LABEL(counts[i].percent), label_str);
|
|
}
|
|
|
|
/* do sync here, too */
|
|
fflush(wtap_dump_file(ld.pdh));
|
|
|
|
if (capture_child) {
|
|
/* This is the child process for a sync mode capture, so send
|
|
our parent a message saying we've written out "ld.sync_packets"
|
|
packets to the capture file. */
|
|
char tmp[DECISIZE+1+1];
|
|
sprintf(tmp, "%d%c", ld.sync_packets, SP_PACKET_COUNT);
|
|
write(1, tmp, strlen(tmp));
|
|
}
|
|
|
|
ld.sync_packets = 0;
|
|
|
|
}
|
|
|
|
if (cnd_stop_timeout != NULL && cnd_eval(cnd_stop_timeout)) {
|
|
/* The specified capture time has elapsed; stop the capture. */
|
|
ld.go = FALSE;
|
|
}
|
|
}
|
|
} /* while (ld.go) */
|
|
|
|
/* delete stop conditions */
|
|
if (cnd_stop_capturesize != NULL)
|
|
cnd_delete(cnd_stop_capturesize);
|
|
if (cnd_stop_timeout != NULL)
|
|
cnd_delete(cnd_stop_timeout);
|
|
|
|
if (ld.pcap_err) {
|
|
snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
|
|
pcap_geterr(pch));
|
|
popup_errmsg(errmsg);
|
|
#ifdef _WIN32
|
|
}
|
|
#else
|
|
} else if (ld.from_pipe && ld.pipe_err == PIPERR)
|
|
popup_errmsg(errmsg);
|
|
#endif
|
|
|
|
if (ld.err == 0)
|
|
write_ok = TRUE;
|
|
else {
|
|
get_capture_file_io_error(errmsg, sizeof(errmsg), cfile.save_file, ld.err,
|
|
FALSE);
|
|
popup_errmsg(errmsg);
|
|
write_ok = FALSE;
|
|
}
|
|
|
|
if (capture_opts.ringbuffer_on) {
|
|
close_ok = ringbuf_wtap_dump_close(&cfile, &err);
|
|
} else {
|
|
close_ok = wtap_dump_close(ld.pdh, &err);
|
|
}
|
|
/* 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) {
|
|
get_capture_file_io_error(errmsg, sizeof(errmsg), cfile.save_file, err,
|
|
TRUE);
|
|
popup_errmsg(errmsg);
|
|
}
|
|
/* Set write_ok to mean the write and the close were successful. */
|
|
write_ok = (write_ok && close_ok);
|
|
|
|
#ifndef _WIN32
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/*
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* XXX We exhibit different behaviour between normal mode and sync mode
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* when the pipe is stdin and not already at EOF. If we're a child, the
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* parent's stdin isn't closed, so if the user starts another capture,
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* pipe_open_live() will very likely not see the expected magic bytes and
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* will say "Unrecognized libpcap format". On the other hand, in normal
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* mode, pipe_open_live() will say "End of file on pipe during open".
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*/
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if (ld.from_pipe && pipe_fd >= 0)
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close(pipe_fd);
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else
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#endif
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{
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/* Get the capture statistics, so we know how many packets were
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dropped. */
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if (pcap_stats(pch, stats) >= 0) {
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*stats_known = TRUE;
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if (capture_child) {
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/* Let the parent process know. */
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char tmp[DECISIZE+1+1];
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sprintf(tmp, "%d%c", stats->ps_drop, SP_DROPS);
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write(1, tmp, strlen(tmp));
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}
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} else {
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snprintf(errmsg, sizeof(errmsg),
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"Can't get packet-drop statistics: %s",
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pcap_geterr(pch));
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popup_errmsg(errmsg);
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}
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pcap_close(pch);
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}
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#ifdef _WIN32
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/* Shut down windows sockets */
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WSACleanup();
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#endif
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gtk_grab_remove(GTK_WIDGET(cap_w));
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gtk_widget_destroy(GTK_WIDGET(cap_w));
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return write_ok;
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error:
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if (capture_opts.ringbuffer_on) {
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/* cleanup ringbuffer */
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ringbuf_error_cleanup();
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} else {
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/* We can't use the save file, and we have no wtap_dump stream
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to close in order to close it, so close the FD directly. */
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close(cfile.save_file_fd);
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/* We couldn't even start the capture, so get rid of the capture
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file. */
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unlink(cfile.save_file); /* silently ignore error */
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g_free(cfile.save_file);
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}
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cfile.save_file = NULL;
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popup_errmsg(errmsg);
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#ifndef _WIN32
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if (ld.from_pipe) {
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if (pipe_fd >= 0)
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close(pipe_fd);
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} else
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#endif
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{
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if (pch != NULL)
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pcap_close(pch);
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}
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return FALSE;
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}
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static void
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get_capture_file_io_error(char *errmsg, int errmsglen, const char *fname,
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int err, gboolean is_close)
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{
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switch (err) {
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case ENOSPC:
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snprintf(errmsg, errmsglen,
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"Not all the packets could be written to the file"
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" to which the capture was being saved\n"
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"(\"%s\") because there is no space left on the file system\n"
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"on which that file resides.",
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fname);
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break;
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#ifdef EDQUOT
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case EDQUOT:
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snprintf(errmsg, errmsglen,
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"Not all the packets could be written to the file"
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" to which the capture was being saved\n"
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"(\"%s\") because you are too close to, or over,"
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" your disk quota\n"
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"on the file system on which that file resides.",
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fname);
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break;
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#endif
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case WTAP_ERR_CANT_CLOSE:
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snprintf(errmsg, errmsglen,
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"The file to which the capture was being saved"
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" couldn't be closed for some unknown reason.");
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break;
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case WTAP_ERR_SHORT_WRITE:
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snprintf(errmsg, errmsglen,
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"Not all the packets could be written to the file"
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" to which the capture was being saved\n"
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"(\"%s\").",
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fname);
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break;
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default:
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if (is_close) {
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snprintf(errmsg, errmsglen,
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"The file to which the capture was being saved\n"
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"(\"%s\") could not be closed: %s.",
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fname, wtap_strerror(err));
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} else {
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snprintf(errmsg, errmsglen,
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"An error occurred while writing to the file"
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" to which the capture was being saved\n"
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"(\"%s\"): %s.",
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fname, wtap_strerror(err));
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}
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break;
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}
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}
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static void
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popup_errmsg(const char *errmsg)
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{
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if (capture_child) {
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/* This is the child process for a sync mode capture.
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Send the error message to our parent, so they can display a
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dialog box containing it. */
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send_errmsg_to_parent(errmsg);
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} else {
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/* Display the dialog box ourselves; there's no parent. */
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simple_dialog(ESD_TYPE_CRIT, NULL, "%s", errmsg);
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}
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}
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static void
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send_errmsg_to_parent(const char *errmsg)
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{
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int msglen = strlen(errmsg);
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char lenbuf[DECISIZE+1+1];
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sprintf(lenbuf, "%u%c", msglen, SP_ERROR_MSG);
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write(1, lenbuf, strlen(lenbuf));
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write(1, errmsg, msglen);
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}
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static float
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pct(gint num, gint denom) {
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if (denom) {
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return (float) num * 100.0 / (float) denom;
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} else {
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return 0.0;
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}
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}
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static void
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stop_capture(int signo _U_)
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{
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ld.go = FALSE;
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}
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static void
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capture_delete_cb(GtkWidget *w _U_, GdkEvent *event _U_, gpointer data) {
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capture_stop_cb(NULL, data);
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}
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static void
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capture_stop_cb(GtkWidget *w _U_, gpointer data) {
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loop_data *ld = (loop_data *) data;
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ld->go = FALSE;
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}
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void
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capture_stop(void)
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{
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/*
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* XXX - find some way of signaling the child in Win32.
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*/
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#ifndef _WIN32
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if (fork_child != -1)
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kill(fork_child, SIGUSR1);
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#endif
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}
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void
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kill_capture_child(void)
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{
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/*
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* XXX - find some way of signaling the child in Win32.
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*/
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#ifndef _WIN32
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if (fork_child != -1)
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kill(fork_child, SIGTERM); /* SIGTERM so it can clean up if necessary */
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#endif
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}
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static void
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capture_pcap_cb(guchar *user, const struct pcap_pkthdr *phdr,
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const guchar *pd)
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{
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struct wtap_pkthdr whdr;
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union wtap_pseudo_header pseudo_header;
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loop_data *ld = (loop_data *) user;
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int err;
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if ((++ld->counts.total >= ld->max) && (ld->max > 0))
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{
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ld->go = FALSE;
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}
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/* Convert from libpcap to Wiretap format.
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If that fails, set "ld->go" to FALSE, to stop the capture, and set
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"ld->err" to the error. */
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pd = wtap_process_pcap_packet(ld->linktype, phdr, pd, &pseudo_header,
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&whdr, &err);
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if (pd == NULL) {
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ld->go = FALSE;
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ld->err = err;
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return;
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}
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if (ld->pdh) {
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/* We're supposed to write the packet to a file; do so.
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If this fails, set "ld->go" to FALSE, to stop the capture, and set
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"ld->err" to the error. */
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if (!wtap_dump(ld->pdh, &whdr, &pseudo_header, pd, &err)) {
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ld->go = FALSE;
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ld->err = err;
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}
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}
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switch (ld->linktype) {
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case WTAP_ENCAP_ETHERNET:
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capture_eth(pd, 0, whdr.caplen, &ld->counts);
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break;
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case WTAP_ENCAP_FDDI:
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case WTAP_ENCAP_FDDI_BITSWAPPED:
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capture_fddi(pd, whdr.caplen, &ld->counts);
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break;
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case WTAP_ENCAP_PRISM_HEADER:
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capture_prism(pd, 0, whdr.caplen, &ld->counts);
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break;
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case WTAP_ENCAP_TOKEN_RING:
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capture_tr(pd, 0, whdr.caplen, &ld->counts);
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break;
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case WTAP_ENCAP_NULL:
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capture_null(pd, whdr.caplen, &ld->counts);
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break;
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case WTAP_ENCAP_PPP:
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capture_ppp_hdlc(pd, 0, whdr.caplen, &ld->counts);
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break;
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case WTAP_ENCAP_RAW_IP:
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capture_raw(pd, whdr.caplen, &ld->counts);
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break;
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case WTAP_ENCAP_SLL:
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capture_sll(pd, whdr.caplen, &ld->counts);
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break;
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case WTAP_ENCAP_LINUX_ATM_CLIP:
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capture_clip(pd, whdr.caplen, &ld->counts);
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break;
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case WTAP_ENCAP_IEEE_802_11:
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case WTAP_ENCAP_IEEE_802_11_WITH_RADIO:
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capture_ieee80211(pd, 0, whdr.caplen, &ld->counts);
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break;
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case WTAP_ENCAP_CHDLC:
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capture_chdlc(pd, 0, whdr.caplen, &ld->counts);
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break;
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case WTAP_ENCAP_LOCALTALK:
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capture_llap(&ld->counts);
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break;
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case WTAP_ENCAP_ATM_PDUS:
|
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capture_atm(&pseudo_header, pd, whdr.caplen, &ld->counts);
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break;
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case WTAP_ENCAP_IP_OVER_FC:
|
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capture_ipfc(pd, whdr.caplen, &ld->counts);
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break;
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case WTAP_ENCAP_ARCNET:
|
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capture_arcnet(pd, whdr.caplen, &ld->counts, FALSE, TRUE);
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break;
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case WTAP_ENCAP_ARCNET_LINUX:
|
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capture_arcnet(pd, whdr.caplen, &ld->counts, TRUE, FALSE);
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break;
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/* XXX - some ATM drivers on FreeBSD might prepend a 4-byte ATM
|
|
pseudo-header to DLT_ATM_RFC1483, with LLC header following;
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|
we might have to implement that at some point. */
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}
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|
}
|
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|
#endif /* HAVE_LIBPCAP */
|