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/*
* libxt_LED.c - shared library add-on to iptables to add customized LED
* trigger support.
*
* (C) 2008 Adam Nielsen <a.nielsen@shikadi.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <stddef.h>
#include <xtables.h>
#include <linux/netfilter/xt_LED.h>
static const struct option LED_opts[] = {
{.name = "led-trigger-id", .has_arg = true, .val = 'i'},
{.name = "led-delay", .has_arg = true, .val = 'd'},
{.name = "led-always-blink", .has_arg = false, .val = 'a'},
{.name = NULL},
};
static void LED_help(void)
{
printf(
"LED target options:\n"
"--led-trigger-id name suffix for led trigger name\n"
"--led-delay ms leave the LED on for this number of\n"
" milliseconds after triggering.\n"
"--led-always-blink blink on arriving packets, even if\n"
" the LED is already on.\n"
);
}
static int LED_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct xt_led_info *led = (void *)(*target)->data;
switch (c) {
case 'i':
xtables_param_act(XTF_NO_INVERT, "LED",
"--led-trigger-id", invert);
if (strlen("netfilter-") + strlen(optarg) > sizeof(led->id))
xtables_error(PARAMETER_PROBLEM,
"--led-trigger-id must be 16 chars or less");
if (optarg[0] == '\0')
xtables_error(PARAMETER_PROBLEM,
"--led-trigger-id cannot be blank");
/* "netfilter-" + 16 char id == 26 == sizeof(led->id) */
strcpy(led->id, "netfilter-");
strcat(led->id, optarg);
*flags = 1;
return true;
case 'd':
xtables_param_act(XTF_NO_INVERT, "LED", "--led-delay", invert);
if (strncasecmp(optarg, "inf", 3) == 0)
led->delay = -1;
else
led->delay = strtoul(optarg, NULL, 0);
return true;
case 'a':
if (!invert)
led->always_blink = 1;
return true;
}
return false;
}
static void LED_final_check(unsigned int flags)
{
if (flags == 0)
xtables_error(PARAMETER_PROBLEM,
"--led-trigger-id must be specified");
}
static void LED_print(const void *ip, const struct xt_entry_target *target,
int numeric)
{
const struct xt_led_info *led = (void *)target->data;
const char *id = led->id + strlen("netfilter-"); /* trim off prefix */
printf("led-trigger-id:\"");
/* Escape double quotes and backslashes in the ID */
while (*id != '\0') {
if (*id == '"' || *id == '\\')
printf("\\");
printf("%c", *id++);
}
printf("\" ");
if (led->delay == -1)
printf("led-delay:inf ");
else
printf("led-delay:%dms ", led->delay);
if (led->always_blink)
printf("led-always-blink ");
}
static void LED_save(const void *ip, const struct xt_entry_target *target)
{
const struct xt_led_info *led = (void *)target->data;
const char *id = led->id + strlen("netfilter-"); /* trim off prefix */
printf("--led-trigger-id \"");
/* Escape double quotes and backslashes in the ID */
while (*id != '\0') {
if (*id == '"' || *id == '\\')
printf("\\");
printf("%c", *id++);
}
printf("\" ");
/* Only print the delay if it's not zero (the default) */
if (led->delay > 0)
printf("--led-delay %d ", led->delay);
else if (led->delay == -1)
printf("--led-delay inf ");
/* Only print always_blink if it's not set to the default */
if (led->always_blink)
printf("--led-always-blink ");
}
static struct xtables_target led_tg_reg = {
.version = XTABLES_VERSION,
.name = "LED",
.family = PF_UNSPEC,
.revision = 0,
.size = XT_ALIGN(sizeof(struct xt_led_info)),
.userspacesize = offsetof(struct xt_led_info, internal_data),
.help = LED_help,
.parse = LED_parse,
.final_check = LED_final_check,
.extra_opts = LED_opts,
.print = LED_print,
.save = LED_save,
};
void _init(void)
{
xtables_register_target(&led_tg_reg);
}
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