2004-10-30 11:44:06 +00:00
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/* capture_sync.c
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* Synchronisation between Ethereal capture parent and child instances
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*
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* $Id$
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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
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* 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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2004-10-30 23:26:47 +00:00
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#include <pcap.h>
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2004-10-30 11:44:06 +00:00
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#include <glib.h>
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#include <stdio.h>
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2004-10-30 23:26:47 +00:00
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#include <ctype.h>
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2004-10-30 11:44:06 +00:00
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#include <string.h>
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2004-10-30 23:26:47 +00:00
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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 <signal.h>
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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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2004-10-30 11:44:06 +00:00
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include "globals.h"
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2005-02-04 08:52:38 +00:00
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#include "file.h"
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2004-10-30 11:44:06 +00:00
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#include "capture.h"
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#include "capture_sync.h"
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#include "simple_dialog.h"
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#ifdef _WIN32
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#include "capture-wpcap.h"
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#endif
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#include "ui_util.h"
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#ifdef HAVE_IO_H
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# include <io.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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/* 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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#ifndef _WIN32
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static char *sync_pipe_signame(int);
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#endif
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static gboolean sync_pipe_input_cb(gint source, gpointer user_data);
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2005-02-23 22:04:31 +00:00
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static void sync_pipe_wait_for_child(capture_options *capture_opts, gboolean always_report);
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2004-10-30 11:44:06 +00:00
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/* Size of buffer to hold decimal representation of
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signed/unsigned 64-bit int */
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#define SP_DECISIZE 20
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/*
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* Indications sent out on the sync pipe.
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*/
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2005-04-12 21:44:55 +00:00
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#define SP_FILE 'F' /* the name of the recently opened file */
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2005-04-12 00:54:52 +00:00
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#define SP_ERROR_MSG 'E' /* error message */
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2005-04-12 21:44:55 +00:00
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#define SP_PACKET_COUNT 'P' /* count of packets captured since last message */
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2005-04-12 00:54:52 +00:00
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#define SP_DROPS 'D' /* count of packets dropped in capture */
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2005-04-12 21:44:55 +00:00
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#define SP_QUIT 'Q' /* capture quit message (from parent to child) */
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2004-10-30 11:44:06 +00:00
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2005-04-12 00:54:52 +00:00
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/* write a message to the recipient pipe in the standard format
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(3 digit message length (excluding length and indicator field),
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1 byte message indicator and the rest is the message) */
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static void
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pipe_write_block(int pipe, char indicator, int len, const char *msg)
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{
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2005-04-12 21:44:55 +00:00
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char lenbuf[3+1+1]; /* 3 digit len + indicator + zero terminator */
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2005-04-12 00:54:52 +00:00
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int ret;
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/*g_warning("write %d enter", pipe);*/
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g_assert(len < 1000);
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g_assert(indicator < '0' || indicator > '9');
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2005-04-12 21:44:55 +00:00
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/* write header (3 digit len + indicator) */
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2005-04-12 00:54:52 +00:00
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g_snprintf(lenbuf, 5, "%03u%c", len, indicator);
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ret = write(pipe, lenbuf, strlen(lenbuf));
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2005-04-12 21:44:55 +00:00
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if(ret == -1) {
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return;
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}
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2005-04-12 00:54:52 +00:00
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/* write value (if we have one) */
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if(len) {
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/*g_warning("write %d indicator: %c value len: %u msg: %s", pipe, indicator, len, msg);*/
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ret = write(pipe, msg, len);
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2005-04-12 21:44:55 +00:00
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if(ret == -1) {
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return;
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}
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2005-04-12 00:54:52 +00:00
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} else {
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/*g_warning("write %d indicator: %c no value", pipe, indicator);*/
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}
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/*g_warning("write %d leave", pipe);*/
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}
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/* read a message from the sending pipe in the standard format
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(3 digit message length (excluding length and indicator field),
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1 byte message indicator and the rest is the message) */
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int
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pipe_read_block(int pipe, char *indicator, int len, char *msg) {
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int required;
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int newly;
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char header[4];
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int offset;
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/* read header (3 digit len and indicator) */
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required = 4;
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offset = 0;
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while(required) {
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newly = read(pipe, &header[offset], required);
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if (newly == 0) {
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/* EOF */
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/*g_warning("read %d header empty (capture closed)", pipe);*/
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return newly;
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}
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if (newly < 0) {
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/* error */
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/*g_warning("read %d header error: %s", pipe, strerror(errno));*/
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return newly;
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}
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required -= newly;
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offset += newly;
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}
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/* convert header values */
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*indicator = header[3];
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required = atoi(header);
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/* only indicator with no value? */
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if(required == 0) {
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/*g_warning("read %d indicator: %c empty value", pipe, *indicator);*/
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return 4;
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}
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g_assert(required <= len);
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len = required;
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/* read value */
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offset = 0;
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while(required) {
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newly = read(pipe, &msg[offset], required);
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if (newly == -1) {
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/* error */
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/*g_warning("read %d value error, indicator: %u", pipe, *indicator);*/
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return newly;
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}
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required -= newly;
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offset += newly;
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}
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/*g_warning("read %d ok indicator: %c len: %u msg: %s", pipe, *indicator, len, msg);*/
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return len + 4;
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}
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2004-10-30 11:44:06 +00:00
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2004-12-29 09:09:35 +00:00
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void
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sync_pipe_packet_count_to_parent(int packet_count)
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{
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char tmp[SP_DECISIZE+1+1];
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2005-04-12 00:54:52 +00:00
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2005-04-12 21:44:55 +00:00
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g_snprintf(tmp, sizeof(tmp), "%d", packet_count);
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2005-04-12 00:54:52 +00:00
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pipe_write_block(1, SP_PACKET_COUNT, strlen(tmp)+1, tmp);
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2004-12-29 09:09:35 +00:00
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}
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2005-02-23 22:04:31 +00:00
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void
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sync_pipe_filename_to_parent(const char *filename)
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{
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2005-04-12 00:54:52 +00:00
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pipe_write_block(1, SP_FILE, strlen(filename)+1, filename);
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2005-02-23 22:04:31 +00:00
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}
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2004-12-29 09:09:35 +00:00
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void
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sync_pipe_errmsg_to_parent(const char *errmsg)
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{
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2005-04-12 00:54:52 +00:00
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pipe_write_block(1, SP_ERROR_MSG, strlen(errmsg)+1, errmsg);
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2004-12-29 09:09:35 +00:00
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}
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void
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sync_pipe_drops_to_parent(int drops)
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{
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char tmp[SP_DECISIZE+1+1];
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2005-04-12 00:54:52 +00:00
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2005-04-12 21:44:55 +00:00
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g_snprintf(tmp, sizeof(tmp), "%d", drops);
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2005-04-12 00:54:52 +00:00
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pipe_write_block(1, SP_DROPS, strlen(tmp)+1, tmp);
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2004-12-29 09:09:35 +00:00
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}
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2005-04-10 16:43:22 +00:00
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#ifdef _WIN32
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static void
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2005-04-12 21:44:55 +00:00
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signal_pipe_capquit_to_child(capture_options *capture_opts)
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2005-04-10 16:43:22 +00:00
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{
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2005-04-12 00:54:52 +00:00
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2005-04-12 21:44:55 +00:00
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pipe_write_block(capture_opts->signal_pipe_fd, SP_QUIT, 0, NULL);
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2005-04-10 16:43:22 +00:00
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}
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#endif
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2004-10-30 11:44:06 +00:00
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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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sync_pipe_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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sync_pipe_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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2005-04-10 14:29:12 +00:00
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#define ARGV_NUMBER_LEN 24
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2004-10-30 11:44:06 +00:00
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gboolean
|
2005-04-30 15:39:40 +00:00
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sync_pipe_start(capture_options *capture_opts) {
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2005-04-10 14:29:12 +00:00
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char ssnap[ARGV_NUMBER_LEN];
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char scount[ARGV_NUMBER_LEN];
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char sfilesize[ARGV_NUMBER_LEN];
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char sfile_duration[ARGV_NUMBER_LEN];
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char sring_num_files[ARGV_NUMBER_LEN];
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char sautostop_files[ARGV_NUMBER_LEN];
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char sautostop_filesize[ARGV_NUMBER_LEN];
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char sautostop_duration[ARGV_NUMBER_LEN];
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2004-10-30 11:44:06 +00:00
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#ifdef _WIN32
|
2005-04-10 14:29:12 +00:00
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char sync_pipe_fd[ARGV_NUMBER_LEN];
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2005-04-10 16:43:22 +00:00
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char signal_pipe_fd[ARGV_NUMBER_LEN];
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2004-10-30 11:44:06 +00:00
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char *fontstring;
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char *filterstring;
|
2005-04-10 16:43:22 +00:00
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int signal_pipe[2]; /* pipe used to send messages from parent to child (currently only stop) */
|
2005-04-10 14:29:12 +00:00
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#else
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char errmsg[1024+1];
|
2004-10-30 11:44:06 +00:00
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#endif
|
2005-04-10 14:29:12 +00:00
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|
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int argc;
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char **argv;
|
2004-10-30 11:44:06 +00:00
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enum PIPES { PIPE_READ, PIPE_WRITE }; /* Constants 0 and 1 for PIPE_READ and PIPE_WRITE */
|
2005-04-10 16:43:22 +00:00
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int sync_pipe[2]; /* pipe used to send messages from child to parent */
|
2004-10-30 11:44:06 +00:00
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|
2005-03-28 00:19:02 +00:00
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2005-04-11 18:57:19 +00:00
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/*g_warning("sync_pipe_start");
|
2005-03-28 00:19:02 +00:00
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capture_opts_info(capture_opts);*/
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|
2005-02-04 01:29:29 +00:00
|
|
|
capture_opts->fork_child = -1;
|
2004-10-30 11:44:06 +00:00
|
|
|
|
|
|
|
/* 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 = sync_pipe_add_arg(argv, &argc, CHILD_NAME);
|
|
|
|
|
|
|
|
argv = sync_pipe_add_arg(argv, &argc, "-i");
|
2005-02-06 21:20:35 +00:00
|
|
|
argv = sync_pipe_add_arg(argv, &argc, capture_opts->iface);
|
2004-10-30 11:44:06 +00:00
|
|
|
|
2005-03-28 14:39:31 +00:00
|
|
|
if(capture_opts->save_file) {
|
|
|
|
argv = sync_pipe_add_arg(argv, &argc, "-w");
|
|
|
|
argv = sync_pipe_add_arg(argv, &argc, capture_opts->save_file);
|
|
|
|
}
|
2004-10-30 11:44:06 +00:00
|
|
|
|
2004-12-29 09:09:35 +00:00
|
|
|
if (capture_opts->has_snaplen) {
|
2004-10-30 11:44:06 +00:00
|
|
|
argv = sync_pipe_add_arg(argv, &argc, "-s");
|
2004-12-29 09:09:35 +00:00
|
|
|
sprintf(ssnap,"%d",capture_opts->snaplen);
|
2004-10-30 11:44:06 +00:00
|
|
|
argv = sync_pipe_add_arg(argv, &argc, ssnap);
|
|
|
|
}
|
|
|
|
|
2004-12-29 09:09:35 +00:00
|
|
|
if (capture_opts->linktype != -1) {
|
2004-10-30 11:44:06 +00:00
|
|
|
argv = sync_pipe_add_arg(argv, &argc, "-y");
|
|
|
|
#ifdef HAVE_PCAP_DATALINK_VAL_TO_NAME
|
2004-12-29 09:09:35 +00:00
|
|
|
sprintf(ssnap,"%s",pcap_datalink_val_to_name(capture_opts->linktype));
|
2004-10-30 11:44:06 +00:00
|
|
|
#else
|
|
|
|
/* XXX - just treat it as a number */
|
2004-12-29 21:20:42 +00:00
|
|
|
sprintf(ssnap,"%d",capture_opts->linktype);
|
2004-10-30 11:44:06 +00:00
|
|
|
#endif
|
|
|
|
argv = sync_pipe_add_arg(argv, &argc, ssnap);
|
|
|
|
}
|
|
|
|
|
2005-03-28 00:19:02 +00:00
|
|
|
if(capture_opts->multi_files_on) {
|
|
|
|
if (capture_opts->has_autostop_filesize) {
|
|
|
|
argv = sync_pipe_add_arg(argv, &argc, "-b");
|
|
|
|
sprintf(sfilesize,"filesize:%d",capture_opts->autostop_filesize);
|
|
|
|
argv = sync_pipe_add_arg(argv, &argc, sfilesize);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (capture_opts->has_file_duration) {
|
|
|
|
argv = sync_pipe_add_arg(argv, &argc, "-b");
|
|
|
|
sprintf(sfile_duration,"duration:%d",capture_opts->file_duration);
|
|
|
|
argv = sync_pipe_add_arg(argv, &argc, sfile_duration);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (capture_opts->has_ring_num_files) {
|
|
|
|
argv = sync_pipe_add_arg(argv, &argc, "-b");
|
|
|
|
sprintf(sring_num_files,"files:%d",capture_opts->ring_num_files);
|
|
|
|
argv = sync_pipe_add_arg(argv, &argc, sring_num_files);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (capture_opts->has_autostop_files) {
|
|
|
|
argv = sync_pipe_add_arg(argv, &argc, "-a");
|
|
|
|
sprintf(sautostop_files,"files:%d",capture_opts->autostop_files);
|
|
|
|
argv = sync_pipe_add_arg(argv, &argc, sautostop_files);
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
if (capture_opts->has_autostop_filesize) {
|
|
|
|
argv = sync_pipe_add_arg(argv, &argc, "-a");
|
|
|
|
sprintf(sautostop_filesize,"filesize:%d",capture_opts->autostop_filesize);
|
|
|
|
argv = sync_pipe_add_arg(argv, &argc, sautostop_filesize);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (capture_opts->has_autostop_packets) {
|
|
|
|
argv = sync_pipe_add_arg(argv, &argc, "-c");
|
|
|
|
sprintf(scount,"%d",capture_opts->autostop_packets);
|
|
|
|
argv = sync_pipe_add_arg(argv, &argc, scount);
|
2004-10-30 11:44:06 +00:00
|
|
|
}
|
|
|
|
|
2004-12-29 09:09:35 +00:00
|
|
|
if (capture_opts->has_autostop_duration) {
|
2004-10-30 11:44:06 +00:00
|
|
|
argv = sync_pipe_add_arg(argv, &argc, "-a");
|
2004-12-29 09:09:35 +00:00
|
|
|
sprintf(sautostop_duration,"duration:%d",capture_opts->autostop_duration);
|
2004-10-30 11:44:06 +00:00
|
|
|
argv = sync_pipe_add_arg(argv, &argc, sautostop_duration);
|
|
|
|
}
|
|
|
|
|
2005-03-28 21:35:21 +00:00
|
|
|
if (!capture_opts->show_info) {
|
2004-10-30 11:44:06 +00:00
|
|
|
argv = sync_pipe_add_arg(argv, &argc, "-H");
|
|
|
|
}
|
|
|
|
|
2004-12-29 09:09:35 +00:00
|
|
|
if (!capture_opts->promisc_mode)
|
2004-10-30 11:44:06 +00:00
|
|
|
argv = sync_pipe_add_arg(argv, &argc, "-p");
|
|
|
|
|
|
|
|
#ifdef _WIN32
|
|
|
|
/* Create a pipe for the child process */
|
2005-04-12 00:54:52 +00:00
|
|
|
/* (inrease this value if you have trouble while fast capture file switches) */
|
|
|
|
if(_pipe(sync_pipe, 5120, O_BINARY) < 0) {
|
2004-10-30 11:44:06 +00:00
|
|
|
/* Couldn't create the pipe between parent and child. */
|
|
|
|
simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, "Couldn't create sync pipe: %s",
|
2005-03-28 14:39:31 +00:00
|
|
|
strerror(errno));
|
2005-04-10 16:43:22 +00:00
|
|
|
g_free(argv);
|
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Create a pipe for the parent process */
|
|
|
|
if(_pipe(signal_pipe, 512, O_BINARY) < 0) {
|
|
|
|
/* Couldn't create the signal pipe between parent and child. */
|
|
|
|
simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, "Couldn't create signal pipe: %s",
|
|
|
|
strerror(errno));
|
|
|
|
close(sync_pipe[PIPE_READ]);
|
|
|
|
close(sync_pipe[PIPE_WRITE]);
|
|
|
|
g_free(argv);
|
2004-10-30 11:44:06 +00:00
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
|
2005-04-10 16:43:22 +00:00
|
|
|
capture_opts->signal_pipe_fd = signal_pipe[PIPE_WRITE];
|
|
|
|
|
2004-10-30 11:44:06 +00:00
|
|
|
/* Convert font name to a quote-encapsulated string and pass to child */
|
|
|
|
argv = sync_pipe_add_arg(argv, &argc, "-m");
|
|
|
|
fontstring = sync_pipe_quote_encapsulate(prefs.PREFS_GUI_FONT_NAME);
|
|
|
|
argv = sync_pipe_add_arg(argv, &argc, fontstring);
|
|
|
|
|
2005-04-10 16:43:22 +00:00
|
|
|
/* Convert sync pipe write handle to a string and pass to child */
|
2004-10-30 11:44:06 +00:00
|
|
|
argv = sync_pipe_add_arg(argv, &argc, "-Z");
|
2005-04-10 16:43:22 +00:00
|
|
|
sprintf(sync_pipe_fd,"sync:%d",sync_pipe[PIPE_WRITE]);
|
2004-10-30 11:44:06 +00:00
|
|
|
argv = sync_pipe_add_arg(argv, &argc, sync_pipe_fd);
|
|
|
|
|
2005-04-10 16:43:22 +00:00
|
|
|
/* Convert signal pipe read handle to a string and pass to child */
|
|
|
|
argv = sync_pipe_add_arg(argv, &argc, "-Z");
|
|
|
|
sprintf(signal_pipe_fd,"signal:%d",signal_pipe[PIPE_READ]);
|
|
|
|
argv = sync_pipe_add_arg(argv, &argc, signal_pipe_fd);
|
|
|
|
|
2004-10-30 11:44:06 +00:00
|
|
|
/* Convert filter string to a quote delimited string and pass to child */
|
|
|
|
filterstring = NULL;
|
2005-02-06 21:20:35 +00:00
|
|
|
if (capture_opts->cfilter != NULL && strlen(capture_opts->cfilter) != 0) {
|
2004-10-30 11:44:06 +00:00
|
|
|
argv = sync_pipe_add_arg(argv, &argc, "-f");
|
2005-02-06 21:20:35 +00:00
|
|
|
filterstring = sync_pipe_quote_encapsulate(capture_opts->cfilter);
|
2004-10-30 11:44:06 +00:00
|
|
|
argv = sync_pipe_add_arg(argv, &argc, filterstring);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Spawn process */
|
2005-02-04 01:29:29 +00:00
|
|
|
capture_opts->fork_child = spawnvp(_P_NOWAIT, ethereal_path, argv);
|
2004-10-30 11:44:06 +00:00
|
|
|
g_free(fontstring);
|
|
|
|
if (filterstring) {
|
|
|
|
g_free(filterstring);
|
|
|
|
}
|
2005-04-10 16:43:22 +00:00
|
|
|
|
|
|
|
/* child own's the read side now, close our handle */
|
|
|
|
close(signal_pipe[PIPE_READ]);
|
2004-10-30 11:44:06 +00:00
|
|
|
#else
|
|
|
|
if (pipe(sync_pipe) < 0) {
|
|
|
|
/* Couldn't create the pipe between parent and child. */
|
|
|
|
simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, "Couldn't create sync pipe: %s",
|
2005-03-28 14:39:31 +00:00
|
|
|
strerror(errno));
|
2005-04-10 16:43:22 +00:00
|
|
|
g_free(argv);
|
2004-10-30 11:44:06 +00:00
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
|
|
|
|
argv = sync_pipe_add_arg(argv, &argc, "-m");
|
|
|
|
argv = sync_pipe_add_arg(argv, &argc, prefs.PREFS_GUI_FONT_NAME);
|
|
|
|
|
2005-02-06 22:19:53 +00:00
|
|
|
if (capture_opts->cfilter != NULL && capture_opts->cfilter != 0) {
|
2004-10-30 11:44:06 +00:00
|
|
|
argv = sync_pipe_add_arg(argv, &argc, "-f");
|
2005-02-06 22:19:53 +00:00
|
|
|
argv = sync_pipe_add_arg(argv, &argc, capture_opts->cfilter);
|
2004-10-30 11:44:06 +00:00
|
|
|
}
|
|
|
|
|
2005-02-04 04:31:59 +00:00
|
|
|
if ((capture_opts->fork_child = fork()) == 0) {
|
2004-10-30 11:44:06 +00:00
|
|
|
/*
|
|
|
|
* 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[PIPE_WRITE]);
|
|
|
|
close(sync_pipe[PIPE_READ]);
|
|
|
|
execvp(ethereal_path, argv);
|
|
|
|
snprintf(errmsg, sizeof errmsg, "Couldn't run %s in child process: %s",
|
|
|
|
ethereal_path, strerror(errno));
|
|
|
|
sync_pipe_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[PIPE_WRITE]);
|
|
|
|
|
2005-02-04 01:29:29 +00:00
|
|
|
if (capture_opts->fork_child == -1) {
|
2004-10-30 11:44:06 +00:00
|
|
|
/* We couldn't even create the child process. */
|
|
|
|
simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
|
2005-03-28 14:39:31 +00:00
|
|
|
"Couldn't create child process: %s", strerror(errno));
|
|
|
|
close(sync_pipe[PIPE_READ]);
|
2005-04-10 16:43:22 +00:00
|
|
|
#ifdef _WIN32
|
|
|
|
close(signal_pipe[PIPE_WRITE]);
|
|
|
|
#endif
|
2004-10-30 11:44:06 +00:00
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
|
2005-04-10 16:43:22 +00:00
|
|
|
/* we might wait for a moment till child is ready, so update screen now */
|
|
|
|
main_window_update();
|
|
|
|
|
2005-03-28 14:39:31 +00:00
|
|
|
/* We were able to 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. */
|
2004-10-30 11:44:06 +00:00
|
|
|
|
2005-03-28 14:39:31 +00:00
|
|
|
/* we have a running capture, now wait for the real capture filename */
|
|
|
|
pipe_input_set_handler(sync_pipe[PIPE_READ], (gpointer) capture_opts,
|
|
|
|
&capture_opts->fork_child, sync_pipe_input_cb);
|
2005-02-28 22:46:49 +00:00
|
|
|
|
2005-03-28 14:39:31 +00:00
|
|
|
return TRUE;
|
2004-10-30 11:44:06 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* 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 gboolean
|
|
|
|
sync_pipe_input_cb(gint source, gpointer user_data)
|
|
|
|
{
|
2005-02-04 01:29:29 +00:00
|
|
|
capture_options *capture_opts = (capture_options *)user_data;
|
2004-10-30 11:44:06 +00:00
|
|
|
#define BUFSIZE 4096
|
2005-04-12 00:54:52 +00:00
|
|
|
char buffer[BUFSIZE+1];
|
|
|
|
int nread;
|
|
|
|
char indicator;
|
2004-10-30 11:44:06 +00:00
|
|
|
|
|
|
|
|
2005-04-12 00:54:52 +00:00
|
|
|
nread = pipe_read_block(source, &indicator, BUFSIZE, buffer);
|
|
|
|
if(nread <= 0) {
|
2004-10-30 11:44:06 +00:00
|
|
|
/* 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. */
|
2005-03-28 14:39:31 +00:00
|
|
|
sync_pipe_wait_for_child(capture_opts, FALSE);
|
2005-04-10 16:43:22 +00:00
|
|
|
#ifdef _WIN32
|
|
|
|
close(capture_opts->signal_pipe_fd);
|
|
|
|
#endif
|
2005-03-28 14:39:31 +00:00
|
|
|
capture_input_closed(capture_opts);
|
2004-10-30 11:44:06 +00:00
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
|
2005-04-12 00:54:52 +00:00
|
|
|
switch(indicator) {
|
2005-04-12 21:44:55 +00:00
|
|
|
case SP_FILE:
|
|
|
|
if(!capture_input_new_file(capture_opts, buffer)) {
|
|
|
|
/* We weren't able to open the new capture file; user has been
|
|
|
|
alerted. Close the sync pipe. */
|
|
|
|
/* XXX - is it safe to close the pipe inside this callback? */
|
|
|
|
close(source);
|
|
|
|
|
|
|
|
/* the child has send us a filename which we couldn't open.
|
|
|
|
this probably means, the child is creating files faster than we can handle it.
|
|
|
|
this should only be the case for very fast file switches
|
|
|
|
we can't do much more than telling the child to stop
|
|
|
|
(this is the emergency brake if user e.g. wants to switch files every second) */
|
|
|
|
sync_pipe_stop(capture_opts);
|
|
|
|
}
|
|
|
|
break;
|
2005-04-12 00:54:52 +00:00
|
|
|
case SP_PACKET_COUNT:
|
|
|
|
nread = atoi(buffer);
|
|
|
|
capture_input_new_packets(capture_opts, nread);
|
|
|
|
break;
|
2005-04-12 21:44:55 +00:00
|
|
|
case SP_ERROR_MSG:
|
|
|
|
simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, buffer);
|
|
|
|
break;
|
2005-04-12 00:54:52 +00:00
|
|
|
case SP_DROPS:
|
|
|
|
cf_set_drops_known(capture_opts->cf, TRUE);
|
|
|
|
cf_set_drops(capture_opts->cf, atoi(buffer));
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
g_assert_not_reached();
|
2004-10-30 11:44:06 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
return TRUE;
|
|
|
|
}
|
|
|
|
|
2004-12-29 09:09:35 +00:00
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2005-04-12 00:54:52 +00:00
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2004-12-29 09:09:35 +00:00
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/* the child process is going down, wait until it's completely terminated */
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2004-10-30 11:44:06 +00:00
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static void
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2005-02-23 22:04:31 +00:00
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sync_pipe_wait_for_child(capture_options *capture_opts, gboolean always_report)
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2004-10-30 11:44:06 +00:00
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{
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int wstatus;
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2005-02-23 22:04:31 +00:00
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g_assert(capture_opts->fork_child != -1);
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2004-10-30 11:44:06 +00:00
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#ifdef _WIN32
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/* XXX - analyze the wait status and display more information
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in the dialog box?
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XXX - set "fork_child" to -1 if we find it exited? */
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2005-02-23 22:04:31 +00:00
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if (_cwait(&wstatus, capture_opts->fork_child, _WAIT_CHILD) == -1) {
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2004-10-30 11:44:06 +00:00
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simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
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"Child capture process stopped unexpectedly");
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}
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#else
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if (wait(&wstatus) != -1) {
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if (WIFEXITED(wstatus)) {
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/* The child exited; display its exit status, if it's not zero,
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and even if it's zero if "always_report" is true. */
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if (always_report || WEXITSTATUS(wstatus) != 0) {
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simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
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"Child capture process exited: exit status %d",
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WEXITSTATUS(wstatus));
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}
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} else if (WIFSTOPPED(wstatus)) {
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/* It stopped, rather than exiting. "Should not happen." */
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simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
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"Child capture process stopped: %s",
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sync_pipe_signame(WSTOPSIG(wstatus)));
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} else if (WIFSIGNALED(wstatus)) {
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/* It died with a signal. */
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simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
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"Child capture process died: %s%s",
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sync_pipe_signame(WTERMSIG(wstatus)),
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WCOREDUMP(wstatus) ? " - core dumped" : "");
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} else {
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/* What? It had to either have exited, or stopped, or died with
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a signal; what happened here? */
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simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
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"Child capture process died: wait status %#o", wstatus);
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}
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}
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/* No more child process. */
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2005-02-23 22:04:31 +00:00
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capture_opts->fork_child = -1;
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2004-10-30 11:44:06 +00:00
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#endif
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}
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#ifndef _WIN32
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2005-04-11 18:57:19 +00:00
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/* convert signal to corresponding name */
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2004-10-30 11:44:06 +00:00
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static char *
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sync_pipe_signame(int sig)
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{
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char *sigmsg;
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static char sigmsg_buf[6+1+3+1];
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switch (sig) {
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case SIGHUP:
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sigmsg = "Hangup";
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break;
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case SIGINT:
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sigmsg = "Interrupted";
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break;
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case SIGQUIT:
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sigmsg = "Quit";
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break;
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case SIGILL:
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sigmsg = "Illegal instruction";
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break;
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case SIGTRAP:
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sigmsg = "Trace trap";
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break;
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case SIGABRT:
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sigmsg = "Abort";
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break;
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case SIGFPE:
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sigmsg = "Arithmetic exception";
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break;
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case SIGKILL:
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sigmsg = "Killed";
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break;
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case SIGBUS:
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sigmsg = "Bus error";
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break;
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case SIGSEGV:
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sigmsg = "Segmentation violation";
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break;
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/* http://metalab.unc.edu/pub/Linux/docs/HOWTO/GCC-HOWTO
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Linux is POSIX compliant. These are not POSIX-defined signals ---
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ISO/IEC 9945-1:1990 (IEEE Std 1003.1-1990), paragraph B.3.3.1.1 sez:
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``The signals SIGBUS, SIGEMT, SIGIOT, SIGTRAP, and SIGSYS
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were omitted from POSIX.1 because their behavior is
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implementation dependent and could not be adequately catego-
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rized. Conforming implementations may deliver these sig-
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nals, but must document the circumstances under which they
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are delivered and note any restrictions concerning their
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delivery.''
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So we only check for SIGSYS on those systems that happen to
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implement them (a system can be POSIX-compliant and implement
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them, it's just that POSIX doesn't *require* a POSIX-compliant
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system to implement them).
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*/
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#ifdef SIGSYS
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case SIGSYS:
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sigmsg = "Bad system call";
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break;
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#endif
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case SIGPIPE:
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sigmsg = "Broken pipe";
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break;
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case SIGALRM:
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sigmsg = "Alarm clock";
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break;
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case SIGTERM:
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sigmsg = "Terminated";
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break;
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default:
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sprintf(sigmsg_buf, "Signal %d", sig);
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sigmsg = sigmsg_buf;
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break;
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}
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return sigmsg;
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}
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#endif
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2005-04-11 18:57:19 +00:00
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/* user wants to stop the capture run */
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2004-10-30 11:44:06 +00:00
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void
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2005-02-04 01:29:29 +00:00
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sync_pipe_stop(capture_options *capture_opts)
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2004-10-30 11:44:06 +00:00
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{
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2005-02-23 22:04:31 +00:00
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/* XXX - in which cases this will be 0? */
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2005-02-07 03:13:51 +00:00
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if (capture_opts->fork_child != -1 && capture_opts->fork_child != 0) {
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2004-10-30 11:44:06 +00:00
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#ifndef _WIN32
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2005-04-11 18:57:19 +00:00
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/* send the SIGUSR1 signal to close the capture child gracefully. */
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2005-04-10 16:43:22 +00:00
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kill(capture_opts->fork_child, SIGUSR1);
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2004-10-30 11:44:06 +00:00
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#else
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2005-04-11 18:57:19 +00:00
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/* Win32 doesn't have the kill() system call, use the special signal pipe
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instead to close the capture child gracefully. */
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2005-04-12 21:44:55 +00:00
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signal_pipe_capquit_to_child(capture_opts);
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2004-10-30 11:44:06 +00:00
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#endif
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}
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}
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2005-04-11 18:57:19 +00:00
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/* Ethereal has to exit, force the capture child to close */
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2004-10-30 11:44:06 +00:00
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void
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2005-02-04 01:29:29 +00:00
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sync_pipe_kill(capture_options *capture_opts)
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2004-10-30 11:44:06 +00:00
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{
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2005-02-23 22:04:31 +00:00
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/* XXX - in which cases this will be 0? */
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2005-02-07 03:13:51 +00:00
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if (capture_opts->fork_child != -1 && capture_opts->fork_child != 0) {
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2004-10-30 11:44:06 +00:00
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#ifndef _WIN32
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2005-02-04 01:29:29 +00:00
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kill(capture_opts->fork_child, SIGTERM); /* SIGTERM so it can clean up if necessary */
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2004-10-30 11:44:06 +00:00
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#else
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/* XXX: this is not the preferred method of closing a process!
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* the clean way would be getting the process id of the child process,
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* then getting window handle hWnd of that process (using EnumChildWindows),
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* and then do a SendMessage(hWnd, WM_CLOSE, 0, 0)
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*
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2005-02-07 03:13:51 +00:00
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* Unfortunately, I don't know how to get the process id from the
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* handle. OpenProcess will get an handle (not a window handle)
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* from the process ID; it will not get a window handle from the
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* process ID. (How could it? A process can have more than one
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* window.)
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2004-10-30 11:44:06 +00:00
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*
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2005-02-07 03:13:51 +00:00
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* Hint: GenerateConsoleCtrlEvent() will only work if both processes are
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* running in the same console; that's not necessarily the case for
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* us, as we might not be running in a console.
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* And this also will require to have the process id.
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2004-10-30 11:44:06 +00:00
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*/
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2005-02-04 01:29:29 +00:00
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TerminateProcess((HANDLE) (capture_opts->fork_child), 0);
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2004-10-30 11:44:06 +00:00
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#endif
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2005-02-07 03:13:51 +00:00
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}
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2004-10-30 11:44:06 +00:00
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}
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#endif /* HAVE_LIBPCAP */
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