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139 lines
3.6 KiB
139 lines
3.6 KiB
/*
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* libxt_LED.c - shared library add-on to iptables to add customized LED
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* trigger support.
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*
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* (C) 2008 Adam Nielsen <a.nielsen@shikadi.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <xtables.h>
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#include <linux/netfilter/xt_LED.h>
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enum {
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O_LED_TRIGGER_ID = 0,
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O_LED_DELAY,
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O_LED_ALWAYS_BLINK,
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};
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#define s struct xt_led_info
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static const struct xt_option_entry LED_opts[] = {
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{.name = "led-trigger-id", .id = O_LED_TRIGGER_ID,
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.flags = XTOPT_MAND, .type = XTTYPE_STRING, .min = 0,
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.max = sizeof(((struct xt_led_info *)NULL)->id) -
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sizeof("netfilter-")},
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{.name = "led-delay", .id = O_LED_DELAY, .type = XTTYPE_STRING},
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{.name = "led-always-blink", .id = O_LED_ALWAYS_BLINK,
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.type = XTTYPE_NONE},
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XTOPT_TABLEEND,
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};
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#undef s
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static void LED_help(void)
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{
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printf(
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"LED target options:\n"
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"--led-trigger-id name suffix for led trigger name\n"
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"--led-delay ms leave the LED on for this number of\n"
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" milliseconds after triggering.\n"
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"--led-always-blink blink on arriving packets, even if\n"
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" the LED is already on.\n"
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);
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}
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static void LED_parse(struct xt_option_call *cb)
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{
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struct xt_led_info *led = cb->data;
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xtables_option_parse(cb);
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switch (cb->entry->id) {
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case O_LED_TRIGGER_ID:
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snprintf(led->id, sizeof(led->id), "netfilter-%s", cb->arg);
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break;
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case O_LED_DELAY:
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if (strncasecmp(cb->arg, "inf", 3) == 0)
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led->delay = -1;
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else if (!xtables_strtoui(cb->arg, NULL, &led->delay, 0, UINT32_MAX))
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xtables_error(PARAMETER_PROBLEM,
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"Delay value must be within range 0..%u",
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UINT32_MAX);
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break;
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case O_LED_ALWAYS_BLINK:
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led->always_blink = 1;
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break;
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}
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}
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static void LED_print(const void *ip, const struct xt_entry_target *target,
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int numeric)
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{
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const struct xt_led_info *led = (void *)target->data;
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const char *id = led->id + strlen("netfilter-"); /* trim off prefix */
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printf(" led-trigger-id:\"");
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/* Escape double quotes and backslashes in the ID */
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while (*id != '\0') {
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if (*id == '"' || *id == '\\')
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printf("\\");
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printf("%c", *id++);
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}
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printf("\"");
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if (led->delay == -1)
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printf(" led-delay:inf");
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else
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printf(" led-delay:%dms", led->delay);
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if (led->always_blink)
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printf(" led-always-blink");
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}
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static void LED_save(const void *ip, const struct xt_entry_target *target)
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{
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const struct xt_led_info *led = (void *)target->data;
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const char *id = led->id + strlen("netfilter-"); /* trim off prefix */
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printf(" --led-trigger-id \"");
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/* Escape double quotes and backslashes in the ID */
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while (*id != '\0') {
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if (*id == '"' || *id == '\\')
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printf("\\");
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printf("%c", *id++);
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}
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printf("\"");
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/* Only print the delay if it's not zero (the default) */
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if (led->delay > 0)
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printf(" --led-delay %d", led->delay);
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else if (led->delay == -1)
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printf(" --led-delay inf");
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/* Only print always_blink if it's not set to the default */
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if (led->always_blink)
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printf(" --led-always-blink");
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}
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static struct xtables_target led_tg_reg = {
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.version = XTABLES_VERSION,
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.name = "LED",
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.family = PF_UNSPEC,
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.revision = 0,
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.size = XT_ALIGN(sizeof(struct xt_led_info)),
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.userspacesize = offsetof(struct xt_led_info, internal_data),
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.help = LED_help,
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.print = LED_print,
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.save = LED_save,
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.x6_parse = LED_parse,
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.x6_options = LED_opts,
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};
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void _init(void)
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{
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xtables_register_target(&led_tg_reg);
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}
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