From 7cd3c2edb1dba13867b80dd29b02d6c945fcd03f Mon Sep 17 00:00:00 2001 From: Adam Nielsen Date: Sun, 4 Apr 2010 12:59:00 +0200 Subject: extensions: add the LED target For the xt_LED target introduced in Linux 2.6.31. Signed-off-by: Jan Engelhardt --- extensions/libxt_LED.c | 155 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 155 insertions(+) create mode 100644 extensions/libxt_LED.c (limited to 'extensions/libxt_LED.c') diff --git a/extensions/libxt_LED.c b/extensions/libxt_LED.c new file mode 100644 index 00000000..af0e091e --- /dev/null +++ b/extensions/libxt_LED.c @@ -0,0 +1,155 @@ +/* + * libxt_LED.c - shared library add-on to iptables to add customized LED + * trigger support. + * + * (C) 2008 Adam Nielsen + * + * 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 +#include +#include +#include +#include + +#include + +#include + +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); +} -- cgit v1.2.3