| /* |
| * 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; |
| |
| xtables_option_parse(cb); |
| switch (cb->entry->id) { |
| case O_LED_TRIGGER_ID: |
| snprintf(led->id, sizeof(led->id), "netfilter-%s", cb->arg); |
| break; |
| case O_LED_DELAY: |
| if (strncasecmp(cb->arg, "inf", 3) == 0) |
| led->delay = -1; |
| else if (!xtables_strtoui(cb->arg, NULL, &led->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); |
| } |