busybox

/* vi: set sw=4 ts=4: */

/*

 * ifplugd for busybox

 *

 * Copyright (C) 2009 Maksym Kryzhanovskyy <xmaks@email.cz>

 *

 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.

 */

#include "libbb.h"

​

#include <linux/if.h>

#include <linux/mii.h>

#include <linux/ethtool.h>

#include <net/ethernet.h>

#include <linux/netlink.h>

#include <linux/rtnetlink.h>

#include <linux/sockios.h>

#include <syslog.h>

​

#define __user

#include <linux/wireless.h>

​

/*

TODO: describe compat status here.

​

One questionable point of the design is netlink usage:

​

We have 1 second timeout by default to poll the link status,

it is short enough so that there are no real benefits in

using netlink to get "instantaneous" interface creation/deletion

notifications. We can check for interface existence by just

doing some fast ioctl using its name.

​

Netlink code then can be just dropped (1k or more?)

*/

​

​

#define IFPLUGD_ENV_PREVIOUS "IFPLUGD_PREVIOUS"

#define IFPLUGD_ENV_CURRENT "IFPLUGD_CURRENT"

​

enum {

    FLAG_NO_AUTO            = 1 <<  0, // -a, Do not enable interface automatically

    FLAG_NO_DAEMON          = 1 <<  1, // -n, Do not daemonize

    FLAG_NO_SYSLOG          = 1 <<  2, // -s, Do not use syslog, use stderr instead

    FLAG_IGNORE_FAIL        = 1 <<  3, // -f, Ignore detection failure, retry instead (failure is treated as DOWN)

    FLAG_IGNORE_FAIL_POSITIVE   = 1 <<  4, // -F, Ignore detection failure, retry instead (failure is treated as UP)

    FLAG_IFACE          = 1 <<  5, // -i, Specify ethernet interface

    FLAG_RUN            = 1 <<  6, // -r, Specify program to execute

    FLAG_IGNORE_RETVAL      = 1 <<  7, // -I, Don't exit on nonzero return value of program executed

    FLAG_POLL_TIME          = 1 <<  8, // -t, Specify poll time in seconds

    FLAG_DELAY_UP           = 1 <<  9, // -u, Specify delay for configuring interface

    FLAG_DELAY_DOWN         = 1 << 10, // -d, Specify delay for deconfiguring interface

    FLAG_API_MODE           = 1 << 11, // -m, Force API mode (mii, priv, ethtool, wlan, auto)

    FLAG_NO_STARTUP         = 1 << 12, // -p, Don't run script on daemon startup

    FLAG_NO_SHUTDOWN        = 1 << 13, // -q, Don't run script on daemon quit

    FLAG_INITIAL_DOWN       = 1 << 14, // -l, Run "down" script on startup if no cable is detected

    FLAG_EXTRA_ARG          = 1 << 15, // -x, Specify an extra argument for action script

    FLAG_MONITOR            = 1 << 16, // -M, Use interface monitoring

#if ENABLE_FEATURE_PIDFILE

    FLAG_KILL           = 1 << 17, // -k, Kill a running daemon

#endif

};

#if ENABLE_FEATURE_PIDFILE