path: root/gtk/firewall_dlg.c

/* firewall_rules_dlg.c
 *
 * $Id$
 *
 * 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.
 */

/*
 * Generate firewall ACL rules based on packet addresses and ports.
 * For directional rules, an outside interface is assumed.
 *
 * There may be better ways to present the information, e.g. all rules
 * in one huge text window, or some sort of tree view.
 */

/*
 * To add a new product, add syntax functions modify the products[] array.
 *
 * To add a new syntax function, add its prototype above the products[]
 * array, and add the function below with all the others.
 */

/* Copied from ssl-dlg.c */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <stdio.h>
#include <string.h>

#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#include <ctype.h>

#include <gtk/gtk.h>

#include <epan/prefs.h>
#include <epan/packet.h>
#include <epan/addr_resolv.h>
#include <epan/charsets.h>
#include <epan/epan_dissect.h>
#include <epan/filesystem.h>
#include <epan/ipproto.h>
#include <epan/dissectors/packet-ipv6.h>

#include <../globals.h>
#include <../alert_box.h>
#include <../simple_dialog.h>
#include <../util.h>
#include <wiretap/file_util.h>

#include <gtk/main.h>
#include <gtk/dlg_utils.h>
#include <gtk/file_dlg.h>
#include <gtk/help_dlg.h>
#include <gtk/keys.h>
#include <gtk/gui_utils.h>
#include <gtk/font_utils.h>
#include "gtk/firewall_dlg.h"

#define MAX_RULE_LEN 200

/* Rule types */
typedef enum {
  RT_NONE,
  RT_MAC_SRC,
  RT_MAC_DST,
  RT_IPv4_SRC,
  RT_IPv4_DST,
  RT_PORT_SRC,
  RT_PORT_DST,
  RT_IPv4_PORT_SRC,
  RT_IPv4_PORT_DST,
  NUM_RULE_TYPES
} rule_type_t;


/* Copied from packet_info struct */
typedef struct _rule_info_t {
  gint product;
  address dl_src;
  address dl_dst;
  address net_src;
  address net_dst;
  port_type ptype;
  guint32 srcport;
  guint32 destport;
  GtkWidget *text;
  GtkWidget *filter_om;
  GtkWidget *deny_cb;
  GtkWidget *inbound_cb;
  GtkWidget *firewall_save_as_w;
  gboolean inbound;
  gboolean deny;
  rule_type_t rule_type;
} rule_info_t;

/* Syntax function prototypes */
typedef void (*syntax_func)(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny);

static void sf_dummy(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny);

static void sf_ipfw_mac(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny);
static void sf_netfilter_mac(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny);

static void sf_ios_std_ipv4(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny);
static void sf_ios_ext_ipv4(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny);
static void sf_ipfilter_ipv4(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny);
static void sf_ipfw_ipv4(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny);
static void sf_netfilter_ipv4(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny);
static void sf_pf_ipv4(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny);
/* XXX - Can you addresses-only filters using WFW/netsh? */

static void sf_ios_ext_port(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny);
static void sf_ipfilter_port(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny);
static void sf_ipfw_port(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny);
static void sf_netfilter_port(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny);
static void sf_pf_port(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny);
static void sf_netsh_port(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny);

static void sf_ios_ext_ipv4_port(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny);
static void sf_ipfilter_ipv4_port(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny);
static void sf_ipfw_ipv4_port(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny);
static void sf_netfilter_ipv4_port(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny);
static void sf_pf_ipv4_port(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny);
static void sf_netsh_ipv4_port(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny);

typedef struct _fw_product_t {
  gchar *name;
  gchar *comment_pfx;
  syntax_func mac_func;
  syntax_func ipv4_func;
  syntax_func port_func;
  syntax_func ipv4_port_func;
  gboolean does_inbound;
} fw_product;

fw_product products[] = {
    { "Cisco IOS (standard)", "!", NULL, sf_ios_std_ipv4, NULL, NULL, FALSE },
    { "Cisco IOS (extended)", "!",
        NULL, sf_ios_ext_ipv4, sf_ios_ext_port, sf_ios_ext_ipv4_port, TRUE },
    { "IP Filter (ipfilter)", "#",
        NULL, sf_ipfilter_ipv4, sf_ipfilter_port, sf_ipfilter_ipv4_port, TRUE },
    { "IPFirewall (ipfw)", "#",
        sf_ipfw_mac, sf_ipfw_ipv4, sf_ipfw_port, sf_ipfw_ipv4_port, TRUE },
    { "Netfilter (iptables)", "#",
        sf_netfilter_mac, sf_netfilter_ipv4, sf_netfilter_port,
        sf_netfilter_ipv4_port, TRUE },
    { "Packet Filter (pf)", "#",
        NULL, sf_pf_ipv4, sf_pf_port, sf_pf_ipv4_port, TRUE },
    { "Windows Firewall (netsh)", "#",
        NULL, NULL, sf_netsh_port, sf_netsh_ipv4_port, FALSE }
};
#define NUM_PRODS (sizeof(products) / sizeof(fw_product))


static void select_product(GtkWidget * win, gpointer data);
static void select_filter(GtkWidget * win, gpointer data);
static void toggle_inbound(GtkToggleButton *t, gpointer data);
static void toggle_deny(GtkToggleButton *t, gpointer data);
static void set_rule_text(rule_info_t *rule_info);
static void firewall_destroy_cb(GtkWidget * win, gpointer data);
static void firewall_copy_cmd_cb(GtkWidget * w, gpointer data);
static void firewall_save_as_cmd_cb(GtkWidget * w, gpointer data);
static void firewall_save_as_ok_cb(GtkWidget * w, gpointer fs);
static void firewall_save_as_destroy_cb(GtkWidget * win, gpointer user_data);

#define WS_RULE_INFO_KEY "rule_info_key"

/* List of "rule_info_t" structures for all rule windows. */
static GList *rule_infos;

/* Remove a "rule_info_t" structure from the list. */
static void
forget_rule_info(rule_info_t *rule_info)
{
  rule_infos = g_list_remove(rule_infos, rule_info);
}

void
firewall_rule_cb(GtkWidget *w _U_, gpointer data _U_)
{
    GtkWidget	*rule_w, *vbox, *txt_scrollw, *text;
    GtkWidget   *label, *product_om, *menu, *menu_item;
    GtkWidget	*hbox, *button_hbox, *button;
    GtkTooltips *tooltips;
    rule_info_t	*rule_info;
    packet_info *pinfo = &cfile.edt->pi;
    guint i;

    rule_info = g_new0(rule_info_t, 1);
    COPY_ADDRESS(&(rule_info->dl_src), &(pinfo->dl_src));
    COPY_ADDRESS(&(rule_info->dl_dst), &(pinfo->dl_dst));
    COPY_ADDRESS(&(rule_info->net_src), &(pinfo->net_src));
    COPY_ADDRESS(&(rule_info->net_dst), &(pinfo->net_dst));
    rule_info->ptype = pinfo->ptype;
    rule_info->srcport = pinfo->srcport;
    rule_info->destport = pinfo->destport;
    rule_info->inbound = TRUE;
    rule_info->deny = TRUE;
    rule_info->product = 0;

    rule_w = dlg_window_new("Firewall ACL Rules");

    gtk_widget_set_name(rule_w, "Firewall ACL rule window");
    gtk_container_border_width(GTK_CONTAINER(rule_w), 6);

    /* setup the container */
    tooltips = gtk_tooltips_new ();

    vbox = gtk_vbox_new(FALSE, 6);
    gtk_container_add(GTK_CONTAINER(rule_w), vbox);

    /* rule type selectors hbox */
    hbox = gtk_hbox_new(FALSE, 1);
    gtk_box_pack_start(GTK_BOX(vbox), hbox, FALSE, FALSE, 0);

    /* product selector */
    label = gtk_label_new("Product");
    gtk_box_pack_start(GTK_BOX(hbox), label, FALSE, FALSE, 0);

    product_om = gtk_option_menu_new();
    menu = gtk_menu_new();
    for (i = 0; i < NUM_PRODS; i++) {
        menu_item = gtk_menu_item_new_with_label(products[i].name);
        g_signal_connect(menu_item, "activate", G_CALLBACK(select_product), GUINT_TO_POINTER(i));
        g_object_set_data(G_OBJECT(menu_item), WS_RULE_INFO_KEY, rule_info);
        gtk_menu_append(GTK_MENU(menu), menu_item);
        /* if (i == 0)
            gtk_menu_item_select(GTK_MENU_ITEM(menu_item)); */
    }
    gtk_option_menu_set_menu(GTK_OPTION_MENU(product_om), menu);
    gtk_box_pack_start(GTK_BOX(hbox), product_om, FALSE, FALSE, 5);

    /* type selector */
    label = gtk_label_new("Filter");
    gtk_box_pack_start(GTK_BOX(hbox), label, FALSE, FALSE, 10);

    rule_info->filter_om = gtk_option_menu_new();
    gtk_box_pack_start(GTK_BOX(hbox), rule_info->filter_om, FALSE, FALSE, 5);

    /* inbound selector */
    rule_info->inbound_cb = gtk_check_button_new_with_label("Inbound");
    gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(rule_info->inbound_cb),
        rule_info->inbound);
    gtk_box_pack_start(GTK_BOX(hbox), rule_info->inbound_cb, FALSE, FALSE, 10);
    g_signal_connect(rule_info->inbound_cb, "toggled", G_CALLBACK(toggle_inbound), rule_info);

    /* deny selector */
    rule_info->deny_cb = gtk_check_button_new_with_label("Deny");
    gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(rule_info->deny_cb),
        rule_info->deny);
    gtk_box_pack_start(GTK_BOX(hbox), rule_info->deny_cb, FALSE, FALSE, 10);
    g_signal_connect(rule_info->deny_cb, "toggled", G_CALLBACK(toggle_deny), rule_info);

    /* create a scrolled window for the text */
    txt_scrollw = scrolled_window_new(NULL, NULL);
    gtk_scrolled_window_set_shadow_type(GTK_SCROLLED_WINDOW(txt_scrollw),
                                        GTK_SHADOW_IN);
    gtk_box_pack_start(GTK_BOX(vbox), txt_scrollw, TRUE, TRUE, 0);

    /* create a text box */
    text = gtk_text_view_new();
    gtk_text_view_set_editable(GTK_TEXT_VIEW(text), FALSE);
    gtk_container_add(GTK_CONTAINER(txt_scrollw), text);
    rule_info->text = text;

    /* Button row */
    if(topic_available(HELP_FIREWALL_DIALOG)) {
        button_hbox = dlg_button_row_new(GTK_STOCK_HELP, GTK_STOCK_COPY, GTK_STOCK_SAVE, GTK_STOCK_CANCEL, NULL);
    } else {
        button_hbox = dlg_button_row_new(GTK_STOCK_COPY, GTK_STOCK_SAVE, GTK_STOCK_CANCEL, NULL);
    }
    gtk_box_pack_start(GTK_BOX(vbox), button_hbox, FALSE, FALSE, 0);

    /* Create Copy Button */
    button = g_object_get_data(G_OBJECT(button_hbox), GTK_STOCK_COPY);
    g_signal_connect(button, "clicked", G_CALLBACK(firewall_copy_cmd_cb), rule_info);
    gtk_tooltips_set_tip (tooltips, button, "Copy rule to clipboard ", NULL);

    /* Create Save Button */
    button = g_object_get_data(G_OBJECT(button_hbox), GTK_STOCK_SAVE);
    g_signal_connect(button, "clicked", G_CALLBACK(firewall_save_as_cmd_cb), rule_info);
    gtk_tooltips_set_tip (tooltips, button, "Save the rule as currently displayed ", NULL);

    button = g_object_get_data(G_OBJECT(button_hbox), GTK_STOCK_CANCEL);
    gtk_tooltips_set_tip (tooltips, button, "Cancel the dialog", NULL);
    window_set_cancel_button(rule_w, button, window_cancel_button_cb);

    if(topic_available(HELP_FIND_DIALOG)) {
        button = g_object_get_data(G_OBJECT(button_hbox), GTK_STOCK_HELP);
        g_signal_connect(button, "clicked", G_CALLBACK(topic_cb), (gpointer)HELP_FIREWALL_DIALOG);
    }

    /* Tuck away the rule_info object into the window */
    g_object_set_data(G_OBJECT(rule_w), WS_RULE_INFO_KEY, rule_info);

    g_signal_connect(rule_w, "delete_event", G_CALLBACK(window_delete_event_cb), NULL);
    g_signal_connect(rule_w, "destroy", G_CALLBACK(firewall_destroy_cb), NULL);

    /* Make sure this widget gets destroyed if we quit the main loop,
       so that if we exit, we clean up any temporary files we have
       for "Follow SSL Stream" windows. */
    gtk_quit_add_destroy(gtk_main_level(), GTK_OBJECT(rule_w));

    gtk_widget_show_all(rule_w);
    window_present(rule_w);
    gtk_option_menu_set_history(GTK_OPTION_MENU(product_om), 0);
    select_product(rule_w, GUINT_TO_POINTER(0));
}

/* Set the current product. */
#define ADD_TO_FILTER_MENU(rt) \
        menu_item = gtk_menu_item_new_with_label(name); \
        g_signal_connect(menu_item, "activate", G_CALLBACK(select_filter), \
            GUINT_TO_POINTER(rt)); \
        g_object_set_data(G_OBJECT(menu_item), WS_RULE_INFO_KEY, rule_info); \
        gtk_menu_append(GTK_MENU(menu), menu_item); \
        if (! rt_set) { \
            rt_set = TRUE; \
            first_mi = menu_item; \
            rule_type = rt; \
        }

#define NAME_TCP_UDP (rule_info->ptype == PT_TCP ? "TCP" : "UDP")
static void
select_product(GtkWidget *w, gpointer data)
{
    guint prod = GPOINTER_TO_UINT(data);
    rule_info_t	*rule_info;
    gchar name[MAX_RULE_LEN], addr_str[MAX_RULE_LEN];
    address *addr;
    GtkWidget *menu, *menu_item, *first_mi = NULL;
    rule_type_t rule_type = RT_NONE;
    gboolean rt_set = FALSE, sensitive = FALSE;

    rule_info = g_object_get_data(G_OBJECT(w), WS_RULE_INFO_KEY);

    if (prod >= NUM_PRODS || !rule_info)
        return;

    rule_info->product = prod;

    /* Clear the menu */
    gtk_option_menu_remove_menu(GTK_OPTION_MENU(rule_info->filter_om));
    menu = gtk_menu_new();
    gtk_option_menu_set_menu(GTK_OPTION_MENU(rule_info->filter_om), menu);

    /* Fill in valid menu items.   */
    if (products[prod].mac_func && rule_info->dl_src.type == AT_ETHER) {
        addr = &(rule_info->dl_src);
        address_to_str_buf(addr, name, MAX_RULE_LEN);
        ADD_TO_FILTER_MENU(RT_MAC_SRC);

        addr = &(rule_info->dl_dst);
        address_to_str_buf(addr, name, MAX_RULE_LEN);
        ADD_TO_FILTER_MENU(RT_MAC_DST);
    }

    if (products[prod].ipv4_func && rule_info->net_src.type == AT_IPv4) {
        addr = &(rule_info->net_src);
        address_to_str_buf(addr, name, MAX_RULE_LEN);
        ADD_TO_FILTER_MENU(RT_IPv4_SRC);

        addr = &(rule_info->net_dst);
        address_to_str_buf(addr, name, MAX_RULE_LEN);
        ADD_TO_FILTER_MENU(RT_IPv4_DST);
    }

    if (products[prod].port_func && (rule_info->ptype == PT_TCP || rule_info->ptype == PT_UDP)) {
        g_snprintf(name, MAX_RULE_LEN, "%s port %u", NAME_TCP_UDP,
            rule_info->srcport);
        ADD_TO_FILTER_MENU(RT_PORT_SRC);
        if (rule_info->srcport != rule_info->destport) {
            g_snprintf(name, MAX_RULE_LEN, "%s port %u", NAME_TCP_UDP,
                rule_info->destport);
            ADD_TO_FILTER_MENU(RT_PORT_DST);
        }
    }

    if (products[prod].ipv4_port_func && rule_info->net_src.type == AT_IPv4 &&
            (rule_info->ptype == PT_TCP || rule_info->ptype == PT_UDP)) {
        addr = &(rule_info->net_src);
        address_to_str_buf(addr, addr_str, MAX_RULE_LEN);
        g_snprintf(name, MAX_RULE_LEN, "%s + %s port %u", addr_str,
            NAME_TCP_UDP, rule_info->srcport);
        ADD_TO_FILTER_MENU(RT_IPv4_PORT_SRC);

        addr = &(rule_info->net_dst);
        address_to_str_buf(addr, addr_str, MAX_RULE_LEN);
        g_snprintf(name, MAX_RULE_LEN, "%s + %s port %u", addr_str,
            NAME_TCP_UDP, rule_info->destport);
        ADD_TO_FILTER_MENU(RT_IPv4_PORT_DST);
        sensitive = TRUE;
    }

    if (rule_type != RT_NONE) {
        gtk_widget_show_all(rule_info->filter_om);
        gtk_option_menu_set_history(GTK_OPTION_MENU(rule_info->filter_om), 0);
        sensitive = TRUE;
    }
    gtk_widget_set_sensitive(rule_info->filter_om, sensitive);
    gtk_widget_set_sensitive(rule_info->inbound_cb,
        products[prod].does_inbound && sensitive);
    gtk_widget_set_sensitive(rule_info->deny_cb, sensitive);

    select_filter(w, GUINT_TO_POINTER(rule_type));
}

/* Set the current product. */
static void
select_filter(GtkWidget *w, gpointer data)
{
    rule_type_t cur_type = GPOINTER_TO_UINT(data);
    rule_info_t	*rule_info;

    rule_info = g_object_get_data(G_OBJECT(w), WS_RULE_INFO_KEY);

    if (cur_type >= NUM_RULE_TYPES || !rule_info)
        return;

    rule_info->rule_type = cur_type;

    set_rule_text(rule_info);
}

/* Set inbound/outbound */
static void
toggle_inbound(GtkToggleButton *t, gpointer data)
{
    rule_info_t	*rule_info = (rule_info_t *) data;

    rule_info->inbound = gtk_toggle_button_get_active(t);

    set_rule_text(rule_info);
}

/* Set deny/allow. */
static void
toggle_deny(GtkToggleButton *t, gpointer data)
{
    rule_info_t	*rule_info = (rule_info_t *) data;

    rule_info->deny = gtk_toggle_button_get_active(t);

    set_rule_text(rule_info);
}

/* Set the rule text */
#define DL_ADDR (rt == RT_MAC_SRC ? &(rule_info->dl_src) : &(rule_info->dl_dst))
#define NET_ADDR (rt == RT_IPv4_SRC ? &(rule_info->net_src) : &(rule_info->net_dst))
#define NET_PORT (rt == RT_PORT_SRC ? rule_info->srcport : rule_info->destport)
static void
set_rule_text(rule_info_t *rule_info) {
    GString *rtxt = g_string_new("");
    gchar addr_str[MAX_RULE_LEN];
    rule_type_t rt = rule_info->rule_type;
    guint prod = rule_info->product;
    address *addr = NULL;
    guint32 port = 0;
    syntax_func rt_func = NULL;

    GtkTextBuffer *buf = gtk_text_view_get_buffer(GTK_TEXT_VIEW(rule_info->text));

    if (prod < NUM_PRODS) {
        g_string_printf(rtxt, "%s %s\n", products[prod].comment_pfx, products[prod].name);
        switch(rt) {
            case RT_NONE:
                g_string_append_printf(rtxt, "%s Not supported", products[prod].comment_pfx);
                rt_func = sf_dummy;
                break;
            case RT_MAC_SRC:
            case RT_MAC_DST:
                addr = DL_ADDR;
                address_to_str_buf(addr, addr_str, MAX_RULE_LEN);
                rt_func = products[prod].mac_func;
                break;
            case RT_IPv4_SRC:
            case RT_IPv4_DST:
                addr = NET_ADDR;
                address_to_str_buf(addr, addr_str, MAX_RULE_LEN);
                rt_func = products[prod].ipv4_func;
                break;
            case RT_PORT_SRC:
            case RT_PORT_DST:
                port = NET_PORT;
                rt_func = products[prod].port_func;
                break;
            case RT_IPv4_PORT_SRC:
            case RT_IPv4_PORT_DST:
                addr = NET_ADDR;
                address_to_str_buf(addr, addr_str, MAX_RULE_LEN);
                port = NET_PORT;
                rt_func = products[prod].ipv4_port_func;
                break;
            default:
                break;
        }
    }

    if (rt_func) {
        rt_func(rtxt, addr_str, port, rule_info->ptype, rule_info->inbound, rule_info->deny);
    } else {
        g_string_append_printf(rtxt, "ERROR: Unable to create rule");
    }

    gtk_text_buffer_set_text(buf, rtxt->str, rtxt->len);

    g_string_free(rtxt, TRUE);
}


/* Rule text functions */
/* Dummy */
static void sf_dummy(GString *rtxt _U_, gchar *addr _U_, guint32 port _U_, port_type ptype _U_, gboolean inbound _U_, gboolean deny _U_) {
}

/* MAC */
#define IPFW_DENY (deny ? "deny" : "allow")
#define IPFW_IN (inbound ? "in" : "out")
static void sf_ipfw_mac(GString *rtxt, gchar *addr, guint32 port _U_, port_type ptype _U_, gboolean inbound, gboolean deny) {
    g_string_append_printf(rtxt, "add %s MAC %s any %s",
        IPFW_DENY, addr, IPFW_IN);
}

#define NF_DROP (deny ? "DROP" : "ACCEPT")
#define NF_INPUT (inbound ? "INPUT" : "OUTPUT")
static void sf_netfilter_mac(GString *rtxt, gchar *addr, guint32 port _U_, port_type ptype _U_, gboolean inbound, gboolean deny) {
    g_string_append_printf(rtxt, "iptables -A %s --mac-source %s -j %s",
        NF_INPUT, addr, NF_DROP);
}

/* IPv4 */
#define IOS_DENY (deny ? "deny" : "permit")
static void sf_ios_std_ipv4(GString *rtxt, gchar *addr, guint32 port _U_, port_type ptype _U_, gboolean inbound _U_, gboolean deny) {
    g_string_append_printf(rtxt, "access-list NUMBER %s host %s", IOS_DENY, addr);
}

static void sf_ios_ext_ipv4(GString *rtxt, gchar *addr, guint32 port _U_, port_type ptype _U_, gboolean inbound, gboolean deny) {
    if (inbound)
        g_string_append_printf(rtxt, "access-list NUMBER %s ip host %s any", IOS_DENY, addr);
    else
        g_string_append_printf(rtxt, "access-list NUMBER %s ip any host %s", IOS_DENY, addr);
}

#define IPFILTER_DENY (deny ? "block" : "pass")
#define IPFILTER_IN (inbound ? "in" : "out")
static void sf_ipfilter_ipv4(GString *rtxt, gchar *addr, guint32 port _U_, port_type ptype _U_, gboolean inbound, gboolean deny) {
    g_string_append_printf(rtxt, "%s %s on le0 from %s to any",
        IPFILTER_DENY, IPFILTER_IN, addr);
}

static void sf_ipfw_ipv4(GString *rtxt, gchar *addr, guint32 port _U_, port_type ptype _U_, gboolean inbound, gboolean deny) {
    g_string_append_printf(rtxt, "add %s ip from %s to any %s",
        IPFW_DENY, addr, IPFW_IN);
}

static void sf_netfilter_ipv4(GString *rtxt, gchar *addr, guint32 port _U_, port_type ptype _U_, gboolean inbound, gboolean deny) {
    g_string_append_printf(rtxt, "iptables -A %s -i eth0 -d %s/32 -j %s",
        NF_INPUT, addr, NF_DROP);
}

#define PF_DENY (deny ? "block" : "pass")
#define PF_IN (inbound ? "in" : "out")
static void sf_pf_ipv4(GString *rtxt, gchar *addr, guint32 port _U_, port_type ptype _U_, gboolean inbound, gboolean deny) {
    g_string_append_printf(rtxt, "%s %s quick on $ext_if from %s to any",
        PF_DENY, PF_IN, addr);
}

/* Port */
#define RT_TCP_UDP (ptype == PT_TCP ? "tcp" : "udp")
static void sf_ios_ext_port(GString *rtxt, gchar *addr _U_, guint32 port, port_type ptype, gboolean inbound _U_, gboolean deny) {
    g_string_append_printf(rtxt, "access-list NUMBER %s %s any any eq %u",
        IOS_DENY, RT_TCP_UDP, port);
}

static void sf_ipfilter_port(GString *rtxt, gchar *addr _U_, guint32 port, port_type ptype _U_, gboolean inbound, gboolean deny) {
    g_string_append_printf(rtxt, "%s %s on le0 proto %s from any to any port = %u",
        IPFILTER_DENY, IPFILTER_IN, RT_TCP_UDP, port);
}

static void sf_ipfw_port(GString *rtxt, gchar *addr _U_, guint32 port, port_type ptype, gboolean inbound, gboolean deny) {
    g_string_append_printf(rtxt, "add %s %s from any to any %u %s",
        IPFW_DENY, RT_TCP_UDP, port, IPFW_IN);
}

static void sf_netfilter_port(GString *rtxt, gchar *addr _U_, guint32 port, port_type ptype, gboolean inbound, gboolean deny) {
    g_string_append_printf(rtxt, "iptables -A %s -p %s --destination-port %u -j %s",
            NF_INPUT, RT_TCP_UDP, port, NF_DROP);
}

static void sf_pf_port(GString *rtxt, gchar *addr _U_, guint32 port, port_type ptype, gboolean inbound, gboolean deny) {
    g_string_append_printf(rtxt, "%s %s quick on $ext_if proto %s from any to any port %u",
        PF_DENY, PF_IN, RT_TCP_UDP, port);
}

#define NETSH_DENY (deny ? "DISABLE" : "ENABLE")
static void sf_netsh_port(GString *rtxt, gchar *addr _U_, guint32 port, port_type ptype, gboolean inbound _U_, gboolean deny) {
    g_string_append_printf(rtxt, "add portopening %s %u Wireshark %s",
        RT_TCP_UDP, port, NETSH_DENY);
}

/* IPv4 + port */
static void sf_ios_ext_ipv4_port(GString *rtxt, gchar *addr, guint32 port _U_, port_type ptype _U_, gboolean inbound, gboolean deny) {
    if (inbound)
        g_string_append_printf(rtxt, "access-list NUMBER %s %s host %s any eq %u", IOS_DENY, RT_TCP_UDP, addr, port);
    else
        g_string_append_printf(rtxt, "access-list NUMBER %s %s any host %s eq %u", IOS_DENY, RT_TCP_UDP, addr, port);
}

static void sf_ipfilter_ipv4_port(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny) {
    if (inbound)
        g_string_append_printf(rtxt, "%s %s on le0 proto %s from %s to any port = %u",
            IPFILTER_DENY, IPFILTER_IN, RT_TCP_UDP, addr, port);
    else
        g_string_append_printf(rtxt, "%s %s on le0 proto %s from any to %s port = %u",
            IPFILTER_DENY, IPFILTER_IN, RT_TCP_UDP, addr, port);
}

static void sf_ipfw_ipv4_port(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny) {
    g_string_append_printf(rtxt, "add %s %s from %s to any %u %s",
        IPFW_DENY, RT_TCP_UDP, addr, port, IPFW_IN);
}

static void sf_pf_ipv4_port(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny) {
    g_string_append_printf(rtxt, "%s %s quick on $ext_if proto %s from %s to any port %u",
        PF_DENY, PF_IN, RT_TCP_UDP, addr, port);
}

static void sf_netfilter_ipv4_port(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound, gboolean deny) {
    g_string_append_printf(rtxt, "iptables -A %s -p %s -d %s/32 --destination-port %u -j %s",
        NF_INPUT, RT_TCP_UDP, addr, port, NF_DROP);
}

static void sf_netsh_ipv4_port(GString *rtxt, gchar *addr, guint32 port, port_type ptype, gboolean inbound _U_, gboolean deny) {
    g_string_append_printf(rtxt, "add portopening %s %u Wireshark %s %s",
        RT_TCP_UDP, port, NETSH_DENY, addr);
}

/* The destroy call back has the responsibility of
 * unlinking the temporary file
 * and freeing the filter_out_filter */
static void
firewall_destroy_cb(GtkWidget *w, gpointer data _U_)
{
    rule_info_t	*rule_info;

    rule_info = g_object_get_data(G_OBJECT(w), WS_RULE_INFO_KEY);
    forget_rule_info(rule_info);

    g_free(rule_info);
}

static void
firewall_copy_cmd_cb(GtkWidget *w _U_, gpointer data)
{
    rule_info_t	*rule_info = data;

    GtkTextIter start, end;
    GtkTextBuffer *buf;

    buf = gtk_text_view_get_buffer(GTK_TEXT_VIEW(rule_info->text));
    gtk_text_buffer_get_start_iter(buf, &start);
    gtk_text_buffer_get_end_iter(buf, &end);
    gtk_text_buffer_move_mark_by_name(buf, "insert", &start);
    gtk_text_buffer_move_mark_by_name(buf, "selection_bound", &end);
    gtk_text_buffer_copy_clipboard(buf, gtk_clipboard_get(GDK_SELECTION_CLIPBOARD));
}

/*
 * Keep a static pointer to the current "Save SSL Follow Stream As" window, if
 * any, so that if somebody tries to do "Save"
 * while there's already a "Save SSL Follow Stream" window up, we just pop
 * up the existing one, rather than creating a new one.
 */
static void
firewall_save_as_cmd_cb(GtkWidget *w _U_, gpointer data)
{
    GtkWidget		*new_win;
    rule_info_t	*rule_info = data;

    if (rule_info->firewall_save_as_w != NULL) {
	/* There's already a dialog box; reactivate it. */
	reactivate_window(rule_info->firewall_save_as_w);
	return;
    }

    new_win = file_selection_new("Wireshark: Save Firewall ACL Rule",
                                 FILE_SELECTION_SAVE);
    rule_info->firewall_save_as_w = new_win;

    /* Tuck away the rule_info object into the window */
    g_object_set_data(G_OBJECT(new_win), WS_RULE_INFO_KEY, rule_info);

    g_signal_connect(new_win, "destroy", G_CALLBACK(firewall_save_as_destroy_cb), rule_info);

    if (gtk_dialog_run(GTK_DIALOG(new_win)) == GTK_RESPONSE_ACCEPT)
    {
        firewall_save_as_ok_cb(new_win, new_win);
    } else {
        window_destroy(new_win);
    }
}


static void
firewall_save_as_ok_cb(GtkWidget * w _U_, gpointer fs)
{
    gchar	*to_name, *rule;
    rule_info_t	*rule_info;
    FILE 	*fh;
    gchar	*dirname;

    GtkTextIter start, end;
    GtkTextBuffer *buf;

    to_name = g_strdup(gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(fs)));

    /* Perhaps the user specified a directory instead of a file.
       Check whether they did. */
    if (test_for_directory(to_name) == EISDIR) {
        /* It's a directory - set the file selection box to display that
           directory, and leave the selection box displayed. */
        set_last_open_dir(to_name);
        g_free(to_name);
        file_selection_set_current_folder(fs, get_last_open_dir());
        return;
    }

    rule_info = g_object_get_data(G_OBJECT(fs), WS_RULE_INFO_KEY);
    fh = eth_fopen(to_name, "w");
    if (fh == NULL) {
        open_failure_alert_box(to_name, errno, TRUE);
        g_free(to_name);
        return;
    }

    buf = gtk_text_view_get_buffer(GTK_TEXT_VIEW(rule_info->text));
    gtk_text_buffer_get_start_iter(buf, &start);
    gtk_text_buffer_get_end_iter(buf, &end);
    rule = gtk_text_buffer_get_text(buf, &start, &end, FALSE);

    fputs(rule, fh);
    fclose(fh);

    gtk_widget_hide(GTK_WIDGET(fs));
    window_destroy(GTK_WIDGET(fs));

    /* Save the directory name for future file dialogs. */
    dirname = get_dirname(to_name);  /* Overwrites to_name */
    set_last_open_dir(dirname);
    g_free(to_name);
}

static void
firewall_save_as_destroy_cb(GtkWidget * win _U_, gpointer data)
{
    rule_info_t	*rule_info = data;

    /* Note that we no longer have a dialog box. */
    rule_info->firewall_save_as_w = NULL;
}