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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 <xtables.h>
#include <linux/netfilter/xt_LED.h>
enum {
O_LED_TRIGGER_ID = 0,
O_LED_DELAY,
O_LED_ALWAYS_BLINK,
};
#define s struct xt_led_info
static const struct xt_option_entry LED_opts[] = {
{.name = "led-trigger-id", .id = O_LED_TRIGGER_ID,
.flags = XTOPT_MAND, .type = XTTYPE_STRING, .min = 0,
.max = sizeof(((struct xt_led_info *)NULL)->id) -
sizeof("netfilter-")},
{.name = "led-delay", .id = O_LED_DELAY, .type = XTTYPE_STRING},
{.name = "led-always-blink", .id = O_LED_ALWAYS_BLINK,
.type = XTTYPE_NONE},
XTOPT_TABLEEND,
};
#undef s
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 void LED_parse(struct xt_option_call *cb)
{
struct xt_led_info *led = cb->data;
unsigned int delay;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_LED_TRIGGER_ID:
strcpy(led->id, "netfilter-");
strcat(led->id, cb->arg);
break;
case O_LED_DELAY:
if (strncasecmp(cb->arg, "inf", 3) == 0)
led->delay = -1;
else if (!xtables_strtoui(cb->arg, NULL, &delay, 0, UINT32_MAX))
xtables_error(PARAMETER_PROBLEM,
"Delay value must be within range 0..%u",
UINT32_MAX);
break;
case O_LED_ALWAYS_BLINK:
led->always_blink = 1;
break;
}
}
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,
.print = LED_print,
.save = LED_save,
.x6_parse = LED_parse,
.x6_options = LED_opts,
};
void _init(void)
{
xtables_register_target(&led_tg_reg);
}
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