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wireshark/gtk/capture_dlg.c

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/* capture_dlg.c
* Routines for packet capture windows
*
* $Id: capture_dlg.c,v 1.1 1999/09/09 03:32:00 gram Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
* Copyright 1998 Gerald Combs
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <gtk/gtk.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <time.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#ifdef HAVE_NET_IF_H
#include <net/if.h>
#endif
#include <signal.h>
#include <errno.h>
#include <wiretap/wtap.h>
#include "capture.h"
#include "globals.h"
#include "main.h"
#include "capture_dlg.h"
#include "prefs_dlg.h"
#include "util.h"
/* Capture callback data keys */
#define E_CAP_IFACE_KEY "cap_iface"
#define E_CAP_FILT_KEY "cap_filter"
#define E_CAP_COUNT_KEY "cap_count"
#define E_CAP_OPEN_KEY "cap_open"
#define E_CAP_SNAP_KEY "cap_snap"
/* Capture filter key */
#define E_CAP_FILT_TE_KEY "cap_filt_te"
static GList*
get_interface_list();
static void
capture_prep_ok_cb(GtkWidget *ok_bt, gpointer parent_w);
static void
capture_prep_close_cb(GtkWidget *close_bt, gpointer parent_w);
static void
search_for_if_cb(gpointer data, gpointer user_data);
static void
free_if_cb(gpointer data, gpointer user_data);
void
capture_prep_cb(GtkWidget *w, gpointer d) {
GtkWidget *cap_open_w, *if_cb, *if_lb,
*count_lb, *count_cb, *main_vb, *if_hb, *count_hb,
*filter_hb, *filter_bt, *filter_te, *caplen_hb,
*bbox, *ok_bt, *cancel_bt, *snap_lb,
*snap_sb;
GtkAdjustment *adj;
GList *if_list, *count_list = NULL;
gchar *count_item1 = "0 (Infinite)", count_item2[16];
if_list = get_interface_list();
if (if_list == NULL)
return;
cap_open_w = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(cap_open_w), "Ethereal: Capture Preferences");
/* Container for each row of widgets */
main_vb = gtk_vbox_new(FALSE, 3);
gtk_container_border_width(GTK_CONTAINER(main_vb), 5);
gtk_container_add(GTK_CONTAINER(cap_open_w), main_vb);
gtk_widget_show(main_vb);
/* Interface row */
if_hb = gtk_hbox_new(FALSE, 3);
gtk_container_add(GTK_CONTAINER(main_vb), if_hb);
gtk_widget_show(if_hb);
if_lb = gtk_label_new("Interface:");
gtk_box_pack_start(GTK_BOX(if_hb), if_lb, FALSE, FALSE, 0);
gtk_widget_show(if_lb);
if_cb = gtk_combo_new();
gtk_combo_set_popdown_strings(GTK_COMBO(if_cb), if_list);
if (cf.iface)
gtk_entry_set_text(GTK_ENTRY(GTK_COMBO(if_cb)->entry), cf.iface);
else if (if_list)
gtk_entry_set_text(GTK_ENTRY(GTK_COMBO(if_cb)->entry), if_list->data);
gtk_box_pack_start(GTK_BOX(if_hb), if_cb, FALSE, FALSE, 0);
gtk_widget_show(if_cb);
while (if_list) {
g_free(if_list->data);
if_list = g_list_remove_link(if_list, if_list);
}
/* Count row */
count_hb = gtk_hbox_new(FALSE, 3);
gtk_container_add(GTK_CONTAINER(main_vb), count_hb);
gtk_widget_show(count_hb);
count_lb = gtk_label_new("Count:");
gtk_box_pack_start(GTK_BOX(count_hb), count_lb, FALSE, FALSE, 0);
gtk_widget_show(count_lb);
count_list = g_list_append(count_list, count_item1);
if (cf.count) {
snprintf(count_item2, 15, "%d", cf.count);
count_list = g_list_append(count_list, count_item2);
}
count_cb = gtk_combo_new();
gtk_combo_set_popdown_strings(GTK_COMBO(count_cb), count_list);
gtk_box_pack_start(GTK_BOX(count_hb), count_cb, FALSE, FALSE, 0);
gtk_widget_show(count_cb);
while (count_list)
count_list = g_list_remove_link(count_list, count_list);
/* Filter row */
filter_hb = gtk_hbox_new(FALSE, 3);
gtk_container_add(GTK_CONTAINER(main_vb), filter_hb);
gtk_widget_show(filter_hb);
filter_bt = gtk_button_new_with_label("Filter:");
gtk_signal_connect(GTK_OBJECT(filter_bt), "clicked",
GTK_SIGNAL_FUNC(prefs_cb), (gpointer) E_PR_PG_FILTER);
gtk_box_pack_start(GTK_BOX(filter_hb), filter_bt, FALSE, TRUE, 0);
gtk_widget_show(filter_bt);
filter_te = gtk_entry_new();
if (cf.cfilter) gtk_entry_set_text(GTK_ENTRY(filter_te), cf.cfilter);
gtk_object_set_data(GTK_OBJECT(filter_bt), E_FILT_TE_PTR_KEY, filter_te);
gtk_box_pack_start(GTK_BOX(filter_hb), filter_te, TRUE, TRUE, 0);
gtk_widget_show(filter_te);
/* Misc row: Capture file checkbox and snap spinbutton */
caplen_hb = gtk_hbox_new(FALSE, 3);
gtk_container_add(GTK_CONTAINER(main_vb), caplen_hb);
gtk_widget_show(caplen_hb);
snap_lb = gtk_label_new("Capture length");
gtk_misc_set_alignment(GTK_MISC(snap_lb), 0, 0.5);
gtk_box_pack_start(GTK_BOX(caplen_hb), snap_lb, FALSE, FALSE, 6);
gtk_widget_show(snap_lb);
adj = (GtkAdjustment *) gtk_adjustment_new((float) cf.snap,
MIN_PACKET_SIZE, WTAP_MAX_PACKET_SIZE, 1.0, 10.0, 0.0);
snap_sb = gtk_spin_button_new (adj, 0, 0);
gtk_spin_button_set_wrap (GTK_SPIN_BUTTON (snap_sb), TRUE);
gtk_widget_set_usize (snap_sb, 80, 0);
gtk_box_pack_start (GTK_BOX(caplen_hb), snap_sb, FALSE, FALSE, 3);
gtk_widget_show(snap_sb);
/* Button row: OK and cancel buttons */
bbox = gtk_hbutton_box_new();
gtk_button_box_set_layout (GTK_BUTTON_BOX (bbox), GTK_BUTTONBOX_END);
gtk_button_box_set_spacing(GTK_BUTTON_BOX(bbox), 5);
gtk_container_add(GTK_CONTAINER(main_vb), bbox);
gtk_widget_show(bbox);
ok_bt = gtk_button_new_with_label ("OK");
gtk_signal_connect(GTK_OBJECT(ok_bt), "clicked",
GTK_SIGNAL_FUNC(capture_prep_ok_cb), GTK_OBJECT(cap_open_w));
GTK_WIDGET_SET_FLAGS(ok_bt, GTK_CAN_DEFAULT);
gtk_box_pack_start (GTK_BOX (bbox), ok_bt, TRUE, TRUE, 0);
gtk_widget_grab_default(ok_bt);
gtk_widget_show(ok_bt);
cancel_bt = gtk_button_new_with_label ("Cancel");
gtk_signal_connect(GTK_OBJECT(cancel_bt), "clicked",
GTK_SIGNAL_FUNC(capture_prep_close_cb), GTK_OBJECT(cap_open_w));
GTK_WIDGET_SET_FLAGS(cancel_bt, GTK_CAN_DEFAULT);
gtk_box_pack_start (GTK_BOX (bbox), cancel_bt, TRUE, TRUE, 0);
gtk_widget_show(cancel_bt);
/* Attach pointers to needed widgets to the capture prefs window/object */
gtk_object_set_data(GTK_OBJECT(cap_open_w), E_CAP_IFACE_KEY, if_cb);
gtk_object_set_data(GTK_OBJECT(cap_open_w), E_CAP_FILT_KEY, filter_te);
gtk_object_set_data(GTK_OBJECT(cap_open_w), E_CAP_COUNT_KEY, count_cb);
gtk_object_set_data(GTK_OBJECT(cap_open_w), E_CAP_SNAP_KEY, snap_sb);
gtk_widget_show(cap_open_w);
}
static void
capture_prep_ok_cb(GtkWidget *ok_bt, gpointer parent_w) {
GtkWidget *if_cb, *filter_te, *count_cb, *snap_sb;
gchar *filter_text;
char tmpname[128+1];
if_cb = (GtkWidget *) gtk_object_get_data(GTK_OBJECT(parent_w), E_CAP_IFACE_KEY);
filter_te = (GtkWidget *) gtk_object_get_data(GTK_OBJECT(parent_w), E_CAP_FILT_KEY);
count_cb = (GtkWidget *) gtk_object_get_data(GTK_OBJECT(parent_w), E_CAP_COUNT_KEY);
snap_sb = (GtkWidget *) gtk_object_get_data(GTK_OBJECT(parent_w), E_CAP_SNAP_KEY);
if (cf.iface) g_free(cf.iface);
cf.iface =
g_strdup(gtk_entry_get_text(GTK_ENTRY(GTK_COMBO(if_cb)->entry)));
filter_text = gtk_entry_get_text(GTK_ENTRY(filter_te));
if (cf.cfilter) g_free(cf.cfilter);
cf.cfilter = NULL; /* ead 06/16/99 */
if (filter_text && filter_text[0]) {
cf.cfilter = g_strdup(gtk_entry_get_text(GTK_ENTRY(filter_te)));
}
cf.count = atoi(gtk_entry_get_text(GTK_ENTRY(GTK_COMBO(count_cb)->entry)));
cf.snap = gtk_spin_button_get_value_as_int(GTK_SPIN_BUTTON(snap_sb));
if (cf.snap < 1)
cf.snap = WTAP_MAX_PACKET_SIZE;
else if (cf.snap < MIN_PACKET_SIZE)
cf.snap = MIN_PACKET_SIZE;
gtk_widget_destroy(GTK_WIDGET(parent_w));
/* Choose a random name for the capture buffer */
if (cf.save_file && !cf.user_saved) {
unlink(cf.save_file); /* silently ignore error */
g_free(cf.save_file);
}
cf.save_file_fd = create_tempfile(tmpname, sizeof tmpname, "ether");
cf.save_file = g_strdup(tmpname);
cf.user_saved = 0;
if( fork_mode ){ /* use fork() for capture */
int fork_child;
char ssnap[24];
char scount[24]; /* need a constant for len of numbers */
char save_file_fd[24];
int err;
sprintf(ssnap,"%d",cf.snap); /* in lieu of itoa */
sprintf(scount,"%d",cf.count);
sprintf(save_file_fd,"%d",cf.save_file_fd);
signal(SIGCHLD, SIG_IGN);
if (sync_mode) pipe(sync_pipe);
if((fork_child = fork()) == 0){
/* args: -k -- capture
* -i interface specification
* -w file to write
* -W file descriptor to write
* -c count to capture
* -Q quit after capture (forces -k)
* -s snaplen
* -S sync mode
* -m / -b fonts
* -f "filter expression"
*/
if (sync_mode) {
close(1);
dup(sync_pipe[1]);
close(sync_pipe[0]);
execlp(ethereal_path, "ethereal", "-k", "-Q", "-i", cf.iface,
"-w", cf.save_file, "-W", save_file_fd,
"-c", scount, "-s", ssnap, "-S",
"-m", medium_font, "-b", bold_font,
(cf.cfilter == NULL)? 0 : "-f",
(cf.cfilter == NULL)? 0 : cf.cfilter,
(const char *)NULL);
}
else {
execlp(ethereal_path, "ethereal", "-k", "-Q", "-i", cf.iface,
"-w", cf.save_file, "-W", save_file_fd,
"-c", scount, "-s", ssnap,
"-m", medium_font, "-b", bold_font,
(cf.cfilter == NULL)? 0 : "-f",
(cf.cfilter == NULL)? 0 : cf.cfilter,
(const char *)NULL);
}
}
else {
cf.filename = cf.save_file;
if (sync_mode) {
close(sync_pipe[1]);
while (!sigusr2_received) {
struct timeval timeout = {1,0};
select(0, NULL, NULL, NULL, &timeout);
if (kill(fork_child, 0) == -1 && errno == ESRCH)
break;
}
if (sigusr2_received) {
err = tail_cap_file(cf.save_file, &cf);
if (err != 0) {
simple_dialog(ESD_TYPE_WARN, NULL,
file_open_error_message(err, FALSE), cf.save_file);
}
}
sigusr2_received = FALSE;
}
}
}
else
capture();
}
static void
capture_prep_close_cb(GtkWidget *close_bt, gpointer parent_w)
{
gtk_grab_remove(GTK_WIDGET(parent_w));
gtk_widget_destroy(GTK_WIDGET(parent_w));
}
struct search_user_data {
char *name;
int found;
};
static GList *
get_interface_list() {
GList *il = NULL;
gint nonloopback_pos = 0;
struct ifreq *ifr, *last;
struct ifconf ifc;
struct ifreq ifrflags;
int sock = socket(AF_INET, SOCK_DGRAM, 0);
struct search_user_data user_data;
pcap_t *pch;
gchar err_str[PCAP_ERRBUF_SIZE];
if (sock < 0)
{
simple_dialog(ESD_TYPE_WARN, NULL,
"Can't list interfaces: error opening socket.");
return NULL;
}
/* Since we have to grab the interface list all at once, we'll make
plenty of room */
ifc.ifc_len = 1024 * sizeof(struct ifreq);
ifc.ifc_buf = malloc(ifc.ifc_len);
if (ioctl(sock, SIOCGIFCONF, &ifc) < 0 ||
ifc.ifc_len < sizeof(struct ifreq))
{
simple_dialog(ESD_TYPE_WARN, NULL,
"Can't list interfaces: SIOCGIFCONF error: %s", strerror(errno));
goto fail;
}
ifr = (struct ifreq *) ifc.ifc_req;
last = (struct ifreq *) ((char *) ifr + ifc.ifc_len);
while (ifr < last)
{
/*
* Skip addresses that begin with "dummy", or that include a ":"
* (the latter are Solaris virtuals).
*/
if (strncmp(ifr->ifr_name, "dummy", 5) == 0 ||
strchr(ifr->ifr_name, ':') != NULL)
goto next;
/*
* If we already have this interface name on the list, don't add
* it (SIOCGIFCONF returns, at least on BSD-flavored systems, one
* entry per interface *address*; if an interface has multiple
* addresses, we get multiple entries for it).
*/
user_data.name = ifr->ifr_name;
user_data.found = FALSE;
g_list_foreach(il, search_for_if_cb, &user_data);
if (user_data.found)
goto next;
/*
* Get the interface flags.
*/
memset(&ifrflags, 0, sizeof ifrflags);
strncpy(ifrflags.ifr_name, ifr->ifr_name, sizeof ifrflags.ifr_name);
if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifrflags) < 0) {
if (errno == ENXIO)
goto next;
simple_dialog(ESD_TYPE_WARN, NULL,
"Can't list interfaces: SIOCGIFFLAGS error on %s: %s",
ifr->ifr_name, strerror(errno));
goto fail;
}
/*
* Skip interfaces that aren't up.
*/
if (!(ifrflags.ifr_flags & IFF_UP))
goto next;
/*
* Skip interfaces that we can't open with "libpcap".
*/
pch = pcap_open_live(ifr->ifr_name, WTAP_MAX_PACKET_SIZE, 0, 0, err_str);
if (pch == NULL)
goto next;
pcap_close(pch);
/*
* If it's a loopback interface, add it at the end of the list,
* otherwise add it after the last non-loopback interface,
* so all loopback interfaces go at the end - we don't want a
* loopback interface to be the default capture device unless there
* are no non-loopback devices.
*/
if ((ifrflags.ifr_flags & IFF_LOOPBACK) ||
strncmp(ifr->ifr_name, "lo", 2) == 0)
il = g_list_insert(il, g_strdup(ifr->ifr_name), -1);
else {
il = g_list_insert(il, g_strdup(ifr->ifr_name), nonloopback_pos);
/* Insert the next non-loopback interface after this one. */
nonloopback_pos++;
}
next:
#ifdef HAVE_SA_LEN
ifr = (struct ifreq *) ((char *) ifr + ifr->ifr_addr.sa_len + IFNAMSIZ);
#else
ifr = (struct ifreq *) ((char *) ifr + sizeof(struct ifreq));
#endif
}
free(ifc.ifc_buf);
close(sock);
if (il == NULL) {
simple_dialog(ESD_TYPE_WARN, NULL,
"There are no network interfaces that can be opened.\n"
"Please check to make sure you have sufficient permission\n"
"to capture packets.");
return NULL;
}
return il;
fail:
if (il != NULL) {
g_list_foreach(il, free_if_cb, NULL);
g_list_free(il);
}
free(ifc.ifc_buf);
close(sock);
return NULL;
}
static void
search_for_if_cb(gpointer data, gpointer user_data)
{
struct search_user_data *search_user_data = user_data;
if (strcmp((char *)data, search_user_data->name) == 0)
search_user_data->found = TRUE;
}
static void
free_if_cb(gpointer data, gpointer user_data)
{
g_free(data);
}
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