2009-04-26 06:38:51 +05:30
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/* vi: set sw=4 ts=4: */
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/*
|
2010-03-30 19:19:57 +05:30
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* ifplugd for busybox, based on ifplugd 0.28 (written by Lennart Poettering).
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2009-04-26 06:38:51 +05:30
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*
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2009-04-26 06:47:44 +05:30
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* Copyright (C) 2009 Maksym Kryzhanovskyy <xmaks@email.cz>
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2009-04-26 06:38:51 +05:30
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*
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2010-08-16 23:44:46 +05:30
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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2009-04-26 06:38:51 +05:30
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*/
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2011-04-11 06:59:49 +05:30
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//usage:#define ifplugd_trivial_usage
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//usage: "[OPTIONS]"
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//usage:#define ifplugd_full_usage "\n\n"
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//usage: "Network interface plug detection daemon\n"
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//usage: "\n -n Don't daemonize"
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//usage: "\n -s Don't log to syslog"
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//usage: "\n -i IFACE Interface"
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//usage: "\n -f/-F Treat link detection error as link down/link up"
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//usage: "\n (otherwise exit on error)"
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//usage: "\n -a Don't up interface at each link probe"
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//usage: "\n -M Monitor creation/destruction of interface"
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//usage: "\n (otherwise it must exist)"
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//usage: "\n -r PROG Script to run"
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//usage: "\n -x ARG Extra argument for script"
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//usage: "\n -I Don't exit on nonzero exit code from script"
|
2012-06-03 13:56:16 +05:30
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//usage: "\n -p Don't run \"up\" script on startup"
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//usage: "\n -q Don't run \"down\" script on exit"
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//usage: "\n -l Always run script on startup"
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2011-04-11 06:59:49 +05:30
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//usage: "\n -t SECS Poll time in seconds"
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//usage: "\n -u SECS Delay before running script after link up"
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//usage: "\n -d SECS Delay after link down"
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//usage: "\n -m MODE API mode (mii, priv, ethtool, wlan, iff, auto)"
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//usage: "\n -k Kill running daemon"
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2009-04-26 06:38:51 +05:30
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#include "libbb.h"
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2009-08-08 06:50:12 +05:30
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#include "fix_u32.h"
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2009-04-26 06:38:51 +05:30
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#include <linux/if.h>
|
2009-05-01 12:34:25 +05:30
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#include <linux/mii.h>
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2009-04-26 06:38:51 +05:30
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#include <linux/ethtool.h>
|
2011-06-10 08:47:59 +05:30
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#ifdef HAVE_NET_ETHERNET_H
|
2015-10-05 14:45:43 +05:30
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/* musl breakage:
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* In file included from /usr/include/net/ethernet.h:10,
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* from networking/ifplugd.c:41:
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* /usr/include/netinet/if_ether.h:96: error: redefinition of 'struct ethhdr'
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*
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* Build succeeds without it on musl. Commented it out.
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* If on your system you need it, consider removing <linux/ethtool.h>
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* and copy-pasting its definitions here (<linux/ethtool.h> is what pulls in
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* conflicting definition of struct ethhdr on musl).
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*/
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/* # include <net/ethernet.h> */
|
2011-06-10 08:47:59 +05:30
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#endif
|
2009-04-26 06:38:51 +05:30
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <linux/sockios.h>
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#include <syslog.h>
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#define __user
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#include <linux/wireless.h>
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|
2015-10-07 05:32:56 +05:30
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#ifndef ETH_ALEN
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# define ETH_ALEN 6
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#endif
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|
2009-04-26 06:47:44 +05:30
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|
/*
|
2010-03-30 19:19:57 +05:30
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|
From initial port to busybox, removed most of the redundancy by
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|
converting implementation of a polymorphic interface to the strict
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functional style. The main role is run a script when link state
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changed, other activities like audio signal or detailed reports
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are on the script itself.
|
2009-04-26 06:47:44 +05:30
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One questionable point of the design is netlink usage:
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We have 1 second timeout by default to poll the link status,
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it is short enough so that there are no real benefits in
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|
using netlink to get "instantaneous" interface creation/deletion
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notifications. We can check for interface existence by just
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|
|
doing some fast ioctl using its name.
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Netlink code then can be just dropped (1k or more?)
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|
*/
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|
2009-04-26 06:38:51 +05:30
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#define IFPLUGD_ENV_PREVIOUS "IFPLUGD_PREVIOUS"
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|
#define IFPLUGD_ENV_CURRENT "IFPLUGD_CURRENT"
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enum {
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|
FLAG_NO_AUTO = 1 << 0, // -a, Do not enable interface automatically
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|
FLAG_NO_DAEMON = 1 << 1, // -n, Do not daemonize
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FLAG_NO_SYSLOG = 1 << 2, // -s, Do not use syslog, use stderr instead
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FLAG_IGNORE_FAIL = 1 << 3, // -f, Ignore detection failure, retry instead (failure is treated as DOWN)
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FLAG_IGNORE_FAIL_POSITIVE = 1 << 4, // -F, Ignore detection failure, retry instead (failure is treated as UP)
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|
FLAG_IFACE = 1 << 5, // -i, Specify ethernet interface
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FLAG_RUN = 1 << 6, // -r, Specify program to execute
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FLAG_IGNORE_RETVAL = 1 << 7, // -I, Don't exit on nonzero return value of program executed
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FLAG_POLL_TIME = 1 << 8, // -t, Specify poll time in seconds
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|
FLAG_DELAY_UP = 1 << 9, // -u, Specify delay for configuring interface
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FLAG_DELAY_DOWN = 1 << 10, // -d, Specify delay for deconfiguring interface
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FLAG_API_MODE = 1 << 11, // -m, Force API mode (mii, priv, ethtool, wlan, auto)
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|
FLAG_NO_STARTUP = 1 << 12, // -p, Don't run script on daemon startup
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FLAG_NO_SHUTDOWN = 1 << 13, // -q, Don't run script on daemon quit
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|
FLAG_INITIAL_DOWN = 1 << 14, // -l, Run "down" script on startup if no cable is detected
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|
FLAG_EXTRA_ARG = 1 << 15, // -x, Specify an extra argument for action script
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|
FLAG_MONITOR = 1 << 16, // -M, Use interface monitoring
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|
|
#if ENABLE_FEATURE_PIDFILE
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|
FLAG_KILL = 1 << 17, // -k, Kill a running daemon
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|
#endif
|
|
|
|
};
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|
|
#if ENABLE_FEATURE_PIDFILE
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|
|
# define OPTION_STR "+ansfFi:r:It:u:d:m:pqlx:Mk"
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|
|
#else
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|
|
# define OPTION_STR "+ansfFi:r:It:u:d:m:pqlx:M"
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|
|
|
#endif
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|
|
enum { // interface status
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|
IFSTATUS_ERR = -1,
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|
IFSTATUS_DOWN = 0,
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|
IFSTATUS_UP = 1,
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|
|
};
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enum { // constant fds
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|
ioctl_fd = 3,
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|
netlink_fd = 4,
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|
|
};
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|
struct globals {
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|
smallint iface_last_status;
|
2010-05-09 02:56:16 +05:30
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|
smallint iface_prev_status;
|
2009-04-26 06:38:51 +05:30
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|
smallint iface_exists;
|
2010-07-08 06:17:25 +05:30
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|
smallint api_method_num;
|
2009-04-26 06:38:51 +05:30
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|
/* Used in getopt32, must have sizeof == sizeof(int) */
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unsigned poll_time;
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unsigned delay_up;
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|
unsigned delay_down;
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const char *iface;
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const char *api_mode;
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const char *script_name;
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|
const char *extra_arg;
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};
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|
#define G (*ptr_to_globals)
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|
#define INIT_G() do { \
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|
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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G.iface_last_status = -1; \
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G.iface_exists = 1; \
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|
G.poll_time = 1; \
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G.delay_down = 5; \
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G.iface = "eth0"; \
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G.api_mode = "a"; \
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|
G.script_name = "/etc/ifplugd/ifplugd.action"; \
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} while (0)
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|
2010-07-22 05:48:05 +05:30
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/* Utility routines */
|
2010-05-09 02:56:16 +05:30
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|
2010-07-22 05:48:05 +05:30
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static void set_ifreq_to_ifname(struct ifreq *ifreq)
|
2009-04-26 06:38:51 +05:30
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|
|
{
|
2010-07-22 05:48:05 +05:30
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|
memset(ifreq, 0, sizeof(struct ifreq));
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|
strncpy_IFNAMSIZ(ifreq->ifr_name, G.iface);
|
2009-04-26 06:38:51 +05:30
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|
}
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|
2010-01-08 16:57:57 +05:30
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|
static int network_ioctl(int request, void* data, const char *errmsg)
|
2009-04-26 06:38:51 +05:30
|
|
|
{
|
2010-01-08 16:57:57 +05:30
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|
int r = ioctl(ioctl_fd, request, data);
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|
if (r < 0 && errmsg)
|
2010-03-29 12:39:05 +05:30
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|
bb_perror_msg("%s failed", errmsg);
|
2010-01-08 16:57:57 +05:30
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|
return r;
|
2009-04-26 06:38:51 +05:30
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}
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2010-07-22 05:48:05 +05:30
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/* Link detection routines and table */
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2009-04-26 06:38:51 +05:30
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static smallint detect_link_mii(void)
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{
|
2011-01-20 05:50:36 +05:30
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|
/* char buffer instead of bona-fide struct avoids aliasing warning */
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char buf[sizeof(struct ifreq)];
|
2011-01-20 15:59:00 +05:30
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|
struct ifreq *const ifreq = (void *)buf;
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|
2011-01-20 05:50:36 +05:30
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struct mii_ioctl_data *mii = (void *)&ifreq->ifr_data;
|
2009-04-26 06:38:51 +05:30
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2011-01-20 05:50:36 +05:30
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set_ifreq_to_ifname(ifreq);
|
2009-04-26 06:38:51 +05:30
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2011-01-20 05:50:36 +05:30
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if (network_ioctl(SIOCGMIIPHY, ifreq, "SIOCGMIIPHY") < 0) {
|
2009-04-26 06:38:51 +05:30
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return IFSTATUS_ERR;
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}
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|
2009-05-01 12:34:25 +05:30
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|
mii->reg_num = 1;
|
2009-04-26 06:38:51 +05:30
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|
2011-01-20 05:50:36 +05:30
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if (network_ioctl(SIOCGMIIREG, ifreq, "SIOCGMIIREG") < 0) {
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2009-04-26 06:38:51 +05:30
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return IFSTATUS_ERR;
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|
}
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|
2009-05-01 12:34:25 +05:30
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|
return (mii->val_out & 0x0004) ? IFSTATUS_UP : IFSTATUS_DOWN;
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2009-04-26 06:38:51 +05:30
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}
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static smallint detect_link_priv(void)
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{
|
2011-01-20 05:50:36 +05:30
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/* char buffer instead of bona-fide struct avoids aliasing warning */
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char buf[sizeof(struct ifreq)];
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2011-01-20 15:59:00 +05:30
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struct ifreq *const ifreq = (void *)buf;
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|
2011-01-20 05:50:36 +05:30
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struct mii_ioctl_data *mii = (void *)&ifreq->ifr_data;
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2009-04-26 06:38:51 +05:30
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2011-01-20 05:50:36 +05:30
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set_ifreq_to_ifname(ifreq);
|
2009-04-26 06:38:51 +05:30
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|
2011-01-20 05:50:36 +05:30
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if (network_ioctl(SIOCDEVPRIVATE, ifreq, "SIOCDEVPRIVATE") < 0) {
|
2009-04-26 06:38:51 +05:30
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|
return IFSTATUS_ERR;
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|
}
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|
2009-05-01 12:34:25 +05:30
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mii->reg_num = 1;
|
2009-04-26 06:38:51 +05:30
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|
2011-01-20 05:50:36 +05:30
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if (network_ioctl(SIOCDEVPRIVATE+1, ifreq, "SIOCDEVPRIVATE+1") < 0) {
|
2009-04-26 06:38:51 +05:30
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return IFSTATUS_ERR;
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}
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2009-05-01 12:34:25 +05:30
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|
return (mii->val_out & 0x0004) ? IFSTATUS_UP : IFSTATUS_DOWN;
|
2009-04-26 06:38:51 +05:30
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}
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static smallint detect_link_ethtool(void)
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|
|
{
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struct ifreq ifreq;
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struct ethtool_value edata;
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set_ifreq_to_ifname(&ifreq);
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edata.cmd = ETHTOOL_GLINK;
|
2009-10-23 22:01:02 +05:30
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ifreq.ifr_data = (void*) &edata;
|
2009-04-26 06:38:51 +05:30
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|
2010-03-29 12:39:05 +05:30
|
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|
if (network_ioctl(SIOCETHTOOL, &ifreq, "ETHTOOL_GLINK") < 0) {
|
2009-04-26 06:38:51 +05:30
|
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|
return IFSTATUS_ERR;
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|
|
}
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|
return edata.data ? IFSTATUS_UP : IFSTATUS_DOWN;
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|
|
}
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|
|
static smallint detect_link_iff(void)
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|
|
|
{
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|
|
|
struct ifreq ifreq;
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|
|
set_ifreq_to_ifname(&ifreq);
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|
2010-03-29 12:39:05 +05:30
|
|
|
if (network_ioctl(SIOCGIFFLAGS, &ifreq, "SIOCGIFFLAGS") < 0) {
|
2009-04-26 06:38:51 +05:30
|
|
|
return IFSTATUS_ERR;
|
|
|
|
}
|
|
|
|
|
2010-01-08 16:57:57 +05:30
|
|
|
/* If IFF_UP is not set (interface is down), IFF_RUNNING is never set
|
|
|
|
* regardless of link status. Simply continue to report last status -
|
|
|
|
* no point in reporting spurious link downs if interface is disabled
|
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|
|
* by admin. When/if it will be brought up,
|
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|
|
* we'll report real link status.
|
|
|
|
*/
|
|
|
|
if (!(ifreq.ifr_flags & IFF_UP) && G.iface_last_status != IFSTATUS_ERR)
|
|
|
|
return G.iface_last_status;
|
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|
|
|
2009-04-26 06:38:51 +05:30
|
|
|
return (ifreq.ifr_flags & IFF_RUNNING) ? IFSTATUS_UP : IFSTATUS_DOWN;
|
|
|
|
}
|
|
|
|
|
|
|
|
static smallint detect_link_wlan(void)
|
|
|
|
{
|
2010-03-29 12:39:05 +05:30
|
|
|
int i;
|
2009-04-26 06:38:51 +05:30
|
|
|
struct iwreq iwrequest;
|
|
|
|
uint8_t mac[ETH_ALEN];
|
|
|
|
|
2010-03-29 12:39:05 +05:30
|
|
|
memset(&iwrequest, 0, sizeof(iwrequest));
|
2009-04-26 07:13:36 +05:30
|
|
|
strncpy_IFNAMSIZ(iwrequest.ifr_ifrn.ifrn_name, G.iface);
|
2009-04-26 06:38:51 +05:30
|
|
|
|
2010-03-29 12:39:05 +05:30
|
|
|
if (network_ioctl(SIOCGIWAP, &iwrequest, "SIOCGIWAP") < 0) {
|
2009-04-26 06:38:51 +05:30
|
|
|
return IFSTATUS_ERR;
|
|
|
|
}
|
|
|
|
|
2010-03-29 12:39:05 +05:30
|
|
|
memcpy(mac, &iwrequest.u.ap_addr.sa_data, ETH_ALEN);
|
2009-04-26 06:38:51 +05:30
|
|
|
|
|
|
|
if (mac[0] == 0xFF || mac[0] == 0x44 || mac[0] == 0x00) {
|
2010-03-29 12:39:05 +05:30
|
|
|
for (i = 1; i < ETH_ALEN; ++i) {
|
2009-04-26 06:38:51 +05:30
|
|
|
if (mac[i] != mac[0])
|
|
|
|
return IFSTATUS_UP;
|
|
|
|
}
|
|
|
|
return IFSTATUS_DOWN;
|
|
|
|
}
|
|
|
|
|
|
|
|
return IFSTATUS_UP;
|
|
|
|
}
|
|
|
|
|
2010-07-22 05:48:05 +05:30
|
|
|
enum { // api mode
|
|
|
|
API_ETHTOOL, // 'e'
|
|
|
|
API_MII, // 'm'
|
|
|
|
API_PRIVATE, // 'p'
|
|
|
|
API_WLAN, // 'w'
|
|
|
|
API_IFF, // 'i'
|
|
|
|
API_AUTO, // 'a'
|
|
|
|
};
|
|
|
|
|
|
|
|
static const char api_modes[] ALIGN1 = "empwia";
|
|
|
|
|
|
|
|
static const struct {
|
|
|
|
const char *name;
|
|
|
|
smallint (*func)(void);
|
|
|
|
} method_table[] = {
|
|
|
|
{ "SIOCETHTOOL" , &detect_link_ethtool },
|
|
|
|
{ "SIOCGMIIPHY" , &detect_link_mii },
|
|
|
|
{ "SIOCDEVPRIVATE" , &detect_link_priv },
|
|
|
|
{ "wireless extension", &detect_link_wlan },
|
|
|
|
{ "IFF_RUNNING" , &detect_link_iff },
|
|
|
|
};
|
|
|
|
|
|
|
|
static const char *strstatus(int status)
|
|
|
|
{
|
|
|
|
if (status == IFSTATUS_ERR)
|
|
|
|
return "error";
|
|
|
|
return "down\0up" + (status * 5);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int run_script(const char *action)
|
|
|
|
{
|
|
|
|
char *env_PREVIOUS, *env_CURRENT;
|
|
|
|
char *argv[5];
|
|
|
|
int r;
|
|
|
|
|
|
|
|
bb_error_msg("executing '%s %s %s'", G.script_name, G.iface, action);
|
|
|
|
|
|
|
|
argv[0] = (char*) G.script_name;
|
|
|
|
argv[1] = (char*) G.iface;
|
|
|
|
argv[2] = (char*) action;
|
|
|
|
argv[3] = (char*) G.extra_arg;
|
|
|
|
argv[4] = NULL;
|
|
|
|
|
|
|
|
env_PREVIOUS = xasprintf("%s=%s", IFPLUGD_ENV_PREVIOUS, strstatus(G.iface_prev_status));
|
|
|
|
putenv(env_PREVIOUS);
|
|
|
|
env_CURRENT = xasprintf("%s=%s", IFPLUGD_ENV_CURRENT, strstatus(G.iface_last_status));
|
|
|
|
putenv(env_CURRENT);
|
|
|
|
|
|
|
|
/* r < 0 - can't exec, 0 <= r < 0x180 - exited, >=0x180 - killed by sig (r-0x180) */
|
|
|
|
r = spawn_and_wait(argv);
|
|
|
|
|
|
|
|
unsetenv(IFPLUGD_ENV_PREVIOUS);
|
|
|
|
unsetenv(IFPLUGD_ENV_CURRENT);
|
|
|
|
free(env_PREVIOUS);
|
|
|
|
free(env_CURRENT);
|
|
|
|
|
|
|
|
bb_error_msg("exit code: %d", r & 0xff);
|
|
|
|
return (option_mask32 & FLAG_IGNORE_RETVAL) ? 0 : r;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void up_iface(void)
|
|
|
|
{
|
|
|
|
struct ifreq ifrequest;
|
|
|
|
|
|
|
|
if (!G.iface_exists)
|
|
|
|
return;
|
|
|
|
|
|
|
|
set_ifreq_to_ifname(&ifrequest);
|
|
|
|
if (network_ioctl(SIOCGIFFLAGS, &ifrequest, "getting interface flags") < 0) {
|
|
|
|
G.iface_exists = 0;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!(ifrequest.ifr_flags & IFF_UP)) {
|
|
|
|
ifrequest.ifr_flags |= IFF_UP;
|
|
|
|
/* Let user know we mess up with interface */
|
|
|
|
bb_error_msg("upping interface");
|
|
|
|
if (network_ioctl(SIOCSIFFLAGS, &ifrequest, "setting interface flags") < 0)
|
|
|
|
xfunc_die();
|
|
|
|
}
|
|
|
|
|
|
|
|
#if 0 /* why do we mess with IP addr? It's not our business */
|
|
|
|
if (network_ioctl(SIOCGIFADDR, &ifrequest, "can't get interface address") < 0) {
|
|
|
|
} else if (ifrequest.ifr_addr.sa_family != AF_INET) {
|
|
|
|
bb_perror_msg("the interface is not IP-based");
|
|
|
|
} else {
|
|
|
|
((struct sockaddr_in*)(&ifrequest.ifr_addr))->sin_addr.s_addr = INADDR_ANY;
|
|
|
|
network_ioctl(SIOCSIFADDR, &ifrequest, "can't set interface address");
|
|
|
|
}
|
|
|
|
network_ioctl(SIOCGIFFLAGS, &ifrequest, "can't get interface flags");
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
static void maybe_up_new_iface(void)
|
|
|
|
{
|
|
|
|
if (!(option_mask32 & FLAG_NO_AUTO))
|
|
|
|
up_iface();
|
|
|
|
|
|
|
|
#if 0 /* bloat */
|
|
|
|
struct ifreq ifrequest;
|
|
|
|
struct ethtool_drvinfo driver_info;
|
|
|
|
|
|
|
|
set_ifreq_to_ifname(&ifrequest);
|
|
|
|
driver_info.cmd = ETHTOOL_GDRVINFO;
|
|
|
|
ifrequest.ifr_data = &driver_info;
|
|
|
|
if (network_ioctl(SIOCETHTOOL, &ifrequest, NULL) == 0) {
|
|
|
|
char buf[sizeof("/xx:xx:xx:xx:xx:xx")];
|
|
|
|
|
|
|
|
/* Get MAC */
|
|
|
|
buf[0] = '\0';
|
|
|
|
set_ifreq_to_ifname(&ifrequest);
|
|
|
|
if (network_ioctl(SIOCGIFHWADDR, &ifrequest, NULL) == 0) {
|
|
|
|
sprintf(buf, "/%02X:%02X:%02X:%02X:%02X:%02X",
|
|
|
|
(uint8_t)(ifrequest.ifr_hwaddr.sa_data[0]),
|
|
|
|
(uint8_t)(ifrequest.ifr_hwaddr.sa_data[1]),
|
|
|
|
(uint8_t)(ifrequest.ifr_hwaddr.sa_data[2]),
|
|
|
|
(uint8_t)(ifrequest.ifr_hwaddr.sa_data[3]),
|
|
|
|
(uint8_t)(ifrequest.ifr_hwaddr.sa_data[4]),
|
|
|
|
(uint8_t)(ifrequest.ifr_hwaddr.sa_data[5]));
|
|
|
|
}
|
|
|
|
|
|
|
|
bb_error_msg("using interface %s%s with driver<%s> (version: %s)",
|
|
|
|
G.iface, buf, driver_info.driver, driver_info.version);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
if (G.api_mode[0] == 'a')
|
|
|
|
G.api_method_num = API_AUTO;
|
|
|
|
}
|
|
|
|
|
2010-07-08 06:17:25 +05:30
|
|
|
static smallint detect_link(void)
|
2009-04-26 06:38:51 +05:30
|
|
|
{
|
|
|
|
smallint status;
|
|
|
|
|
|
|
|
if (!G.iface_exists)
|
|
|
|
return (option_mask32 & FLAG_MONITOR) ? IFSTATUS_DOWN : IFSTATUS_ERR;
|
|
|
|
|
2010-01-08 16:57:57 +05:30
|
|
|
/* Some drivers can't detect link status when the interface is down.
|
|
|
|
* I imagine detect_link_iff() is the most vulnerable.
|
|
|
|
* That's why -a "noauto" in an option, not a hardwired behavior.
|
|
|
|
*/
|
2009-04-26 06:38:51 +05:30
|
|
|
if (!(option_mask32 & FLAG_NO_AUTO))
|
|
|
|
up_iface();
|
|
|
|
|
2010-07-22 05:48:05 +05:30
|
|
|
if (G.api_method_num == API_AUTO) {
|
|
|
|
int i;
|
|
|
|
smallint sv_logmode;
|
|
|
|
|
|
|
|
sv_logmode = logmode;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(method_table); i++) {
|
|
|
|
logmode = LOGMODE_NONE;
|
|
|
|
status = method_table[i].func();
|
|
|
|
logmode = sv_logmode;
|
|
|
|
if (status != IFSTATUS_ERR) {
|
|
|
|
G.api_method_num = i;
|
|
|
|
bb_error_msg("using %s detection mode", method_table[i].name);
|
|
|
|
break;
|
2010-07-08 06:17:25 +05:30
|
|
|
}
|
|
|
|
}
|
2010-07-22 05:48:05 +05:30
|
|
|
} else {
|
|
|
|
status = method_table[G.api_method_num].func();
|
2010-07-08 06:17:25 +05:30
|
|
|
}
|
|
|
|
|
2009-04-26 06:38:51 +05:30
|
|
|
if (status == IFSTATUS_ERR) {
|
|
|
|
if (option_mask32 & FLAG_IGNORE_FAIL)
|
|
|
|
status = IFSTATUS_DOWN;
|
2010-07-08 06:17:25 +05:30
|
|
|
else if (option_mask32 & FLAG_IGNORE_FAIL_POSITIVE)
|
2009-04-26 06:38:51 +05:30
|
|
|
status = IFSTATUS_UP;
|
2010-07-22 05:48:05 +05:30
|
|
|
else if (G.api_mode[0] == 'a')
|
2010-07-08 06:17:25 +05:30
|
|
|
bb_error_msg("can't detect link status");
|
2009-04-26 06:38:51 +05:30
|
|
|
}
|
2010-07-22 05:48:05 +05:30
|
|
|
|
2009-04-26 06:38:51 +05:30
|
|
|
if (status != G.iface_last_status) {
|
2010-05-09 02:56:16 +05:30
|
|
|
G.iface_prev_status = G.iface_last_status;
|
2009-04-26 06:38:51 +05:30
|
|
|
G.iface_last_status = status;
|
|
|
|
}
|
|
|
|
|
|
|
|
return status;
|
|
|
|
}
|
|
|
|
|
|
|
|
static NOINLINE int check_existence_through_netlink(void)
|
|
|
|
{
|
2010-04-02 10:34:44 +05:30
|
|
|
int iface_len;
|
2013-08-04 21:38:40 +05:30
|
|
|
/* Buffer was 1K, but on linux-3.9.9 it was reported to be too small.
|
|
|
|
* netlink.h: "limit to 8K to avoid MSG_TRUNC when PAGE_SIZE is very large".
|
|
|
|
* Note: on error returns (-1) we exit, no need to free replybuf.
|
|
|
|
*/
|
|
|
|
enum { BUF_SIZE = 8 * 1024 };
|
|
|
|
char *replybuf = xmalloc(BUF_SIZE);
|
2009-04-26 06:38:51 +05:30
|
|
|
|
2010-04-02 10:34:44 +05:30
|
|
|
iface_len = strlen(G.iface);
|
2009-04-26 06:38:51 +05:30
|
|
|
while (1) {
|
|
|
|
struct nlmsghdr *mhdr;
|
|
|
|
ssize_t bytes;
|
|
|
|
|
2013-08-04 21:38:40 +05:30
|
|
|
bytes = recv(netlink_fd, replybuf, BUF_SIZE, MSG_DONTWAIT);
|
2009-04-26 06:38:51 +05:30
|
|
|
if (bytes < 0) {
|
|
|
|
if (errno == EAGAIN)
|
2013-08-04 21:38:40 +05:30
|
|
|
goto ret;
|
2009-04-26 06:38:51 +05:30
|
|
|
if (errno == EINTR)
|
|
|
|
continue;
|
|
|
|
bb_perror_msg("netlink: recv");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
mhdr = (struct nlmsghdr*)replybuf;
|
|
|
|
while (bytes > 0) {
|
2010-03-30 19:19:57 +05:30
|
|
|
if (!NLMSG_OK(mhdr, bytes)) {
|
2009-04-26 06:38:51 +05:30
|
|
|
bb_error_msg("netlink packet too small or truncated");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (mhdr->nlmsg_type == RTM_NEWLINK || mhdr->nlmsg_type == RTM_DELLINK) {
|
|
|
|
struct rtattr *attr;
|
|
|
|
int attr_len;
|
|
|
|
|
|
|
|
if (mhdr->nlmsg_len < NLMSG_LENGTH(sizeof(struct ifinfomsg))) {
|
|
|
|
bb_error_msg("netlink packet too small or truncated");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2010-03-30 19:19:57 +05:30
|
|
|
attr = IFLA_RTA(NLMSG_DATA(mhdr));
|
|
|
|
attr_len = IFLA_PAYLOAD(mhdr);
|
2009-04-26 06:38:51 +05:30
|
|
|
|
|
|
|
while (RTA_OK(attr, attr_len)) {
|
|
|
|
if (attr->rta_type == IFLA_IFNAME) {
|
|
|
|
int len = RTA_PAYLOAD(attr);
|
|
|
|
if (len > IFNAMSIZ)
|
|
|
|
len = IFNAMSIZ;
|
2010-04-02 10:34:44 +05:30
|
|
|
if (iface_len <= len
|
|
|
|
&& strncmp(G.iface, RTA_DATA(attr), len) == 0
|
|
|
|
) {
|
2009-04-26 06:38:51 +05:30
|
|
|
G.iface_exists = (mhdr->nlmsg_type == RTM_NEWLINK);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
attr = RTA_NEXT(attr, attr_len);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
mhdr = NLMSG_NEXT(mhdr, bytes);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2013-08-04 21:38:40 +05:30
|
|
|
ret:
|
|
|
|
free(replybuf);
|
2009-04-26 06:38:51 +05:30
|
|
|
return G.iface_exists;
|
|
|
|
}
|
|
|
|
|
2009-05-01 12:34:25 +05:30
|
|
|
#if ENABLE_FEATURE_PIDFILE
|
2009-04-26 06:38:51 +05:30
|
|
|
static NOINLINE pid_t read_pid(const char *filename)
|
|
|
|
{
|
|
|
|
int len;
|
|
|
|
char buf[128];
|
|
|
|
|
|
|
|
len = open_read_close(filename, buf, 127);
|
|
|
|
if (len > 0) {
|
|
|
|
buf[len] = '\0';
|
|
|
|
/* returns ULONG_MAX on error => -1 */
|
|
|
|
return bb_strtoul(buf, NULL, 10);
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
2009-05-01 12:34:25 +05:30
|
|
|
#endif
|
2009-04-26 06:38:51 +05:30
|
|
|
|
|
|
|
int ifplugd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
|
|
int ifplugd_main(int argc UNUSED_PARAM, char **argv)
|
|
|
|
{
|
|
|
|
int iface_status;
|
|
|
|
int delay_time;
|
|
|
|
const char *iface_status_str;
|
|
|
|
struct pollfd netlink_pollfd[1];
|
|
|
|
unsigned opts;
|
2010-07-08 06:17:25 +05:30
|
|
|
const char *api_mode_found;
|
2009-04-26 06:38:51 +05:30
|
|
|
#if ENABLE_FEATURE_PIDFILE
|
|
|
|
char *pidfile_name;
|
|
|
|
pid_t pid_from_pidfile;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
INIT_G();
|
|
|
|
|
|
|
|
opt_complementary = "t+:u+:d+";
|
|
|
|
opts = getopt32(argv, OPTION_STR,
|
|
|
|
&G.iface, &G.script_name, &G.poll_time, &G.delay_up,
|
|
|
|
&G.delay_down, &G.api_mode, &G.extra_arg);
|
2009-11-07 22:00:14 +05:30
|
|
|
G.poll_time *= 1000;
|
2009-04-26 06:38:51 +05:30
|
|
|
|
|
|
|
applet_name = xasprintf("ifplugd(%s)", G.iface);
|
|
|
|
|
|
|
|
#if ENABLE_FEATURE_PIDFILE
|
2012-12-11 01:19:39 +05:30
|
|
|
pidfile_name = xasprintf(CONFIG_PID_FILE_PATH "/ifplugd.%s.pid", G.iface);
|
2009-04-26 06:38:51 +05:30
|
|
|
pid_from_pidfile = read_pid(pidfile_name);
|
|
|
|
|
|
|
|
if (opts & FLAG_KILL) {
|
|
|
|
if (pid_from_pidfile > 0)
|
2013-02-28 17:20:09 +05:30
|
|
|
/* Upstream tool use SIGINT for -k */
|
|
|
|
kill(pid_from_pidfile, SIGINT);
|
2009-04-26 06:38:51 +05:30
|
|
|
return EXIT_SUCCESS;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (pid_from_pidfile > 0 && kill(pid_from_pidfile, 0) == 0)
|
|
|
|
bb_error_msg_and_die("daemon already running");
|
|
|
|
#endif
|
2010-07-22 05:48:05 +05:30
|
|
|
|
2010-07-08 06:17:25 +05:30
|
|
|
api_mode_found = strchr(api_modes, G.api_mode[0]);
|
|
|
|
if (!api_mode_found)
|
2009-04-26 06:38:51 +05:30
|
|
|
bb_error_msg_and_die("unknown API mode '%s'", G.api_mode);
|
2010-07-08 06:17:25 +05:30
|
|
|
G.api_method_num = api_mode_found - api_modes;
|
2009-04-26 06:38:51 +05:30
|
|
|
|
|
|
|
if (!(opts & FLAG_NO_DAEMON))
|
|
|
|
bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
|
|
|
|
|
|
|
|
xmove_fd(xsocket(AF_INET, SOCK_DGRAM, 0), ioctl_fd);
|
|
|
|
if (opts & FLAG_MONITOR) {
|
2010-07-22 05:48:05 +05:30
|
|
|
struct sockaddr_nl addr;
|
|
|
|
int fd = xsocket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
|
|
|
|
|
|
|
|
memset(&addr, 0, sizeof(addr));
|
|
|
|
addr.nl_family = AF_NETLINK;
|
|
|
|
addr.nl_groups = RTMGRP_LINK;
|
|
|
|
addr.nl_pid = getpid();
|
|
|
|
|
|
|
|
xbind(fd, (struct sockaddr*)&addr, sizeof(addr));
|
|
|
|
xmove_fd(fd, netlink_fd);
|
2009-04-26 06:38:51 +05:30
|
|
|
}
|
|
|
|
|
|
|
|
write_pidfile(pidfile_name);
|
|
|
|
|
|
|
|
/* this can't be moved before socket creation */
|
|
|
|
if (!(opts & FLAG_NO_SYSLOG)) {
|
|
|
|
openlog(applet_name, 0, LOG_DAEMON);
|
|
|
|
logmode |= LOGMODE_SYSLOG;
|
|
|
|
}
|
|
|
|
|
|
|
|
bb_signals(0
|
|
|
|
| (1 << SIGINT )
|
|
|
|
| (1 << SIGTERM)
|
|
|
|
| (1 << SIGQUIT)
|
|
|
|
| (1 << SIGHUP ) /* why we ignore it? */
|
|
|
|
/* | (1 << SIGCHLD) - run_script does not use it anymore */
|
|
|
|
, record_signo);
|
|
|
|
|
|
|
|
bb_error_msg("started: %s", bb_banner);
|
|
|
|
|
|
|
|
if (opts & FLAG_MONITOR) {
|
|
|
|
struct ifreq ifrequest;
|
|
|
|
set_ifreq_to_ifname(&ifrequest);
|
2010-01-08 16:57:57 +05:30
|
|
|
G.iface_exists = (network_ioctl(SIOCGIFINDEX, &ifrequest, NULL) == 0);
|
2009-04-26 06:38:51 +05:30
|
|
|
}
|
|
|
|
|
|
|
|
if (G.iface_exists)
|
|
|
|
maybe_up_new_iface();
|
|
|
|
|
|
|
|
iface_status = detect_link();
|
|
|
|
if (iface_status == IFSTATUS_ERR)
|
|
|
|
goto exiting;
|
|
|
|
iface_status_str = strstatus(iface_status);
|
|
|
|
|
|
|
|
if (opts & FLAG_MONITOR) {
|
|
|
|
bb_error_msg("interface %s",
|
|
|
|
G.iface_exists ? "exists"
|
|
|
|
: "doesn't exist, waiting");
|
|
|
|
}
|
|
|
|
/* else we assume it always exists, but don't mislead user
|
|
|
|
* by potentially lying that it really exists */
|
|
|
|
|
|
|
|
if (G.iface_exists) {
|
|
|
|
bb_error_msg("link is %s", iface_status_str);
|
|
|
|
}
|
|
|
|
|
|
|
|
if ((!(opts & FLAG_NO_STARTUP)
|
|
|
|
&& iface_status == IFSTATUS_UP
|
|
|
|
)
|
|
|
|
|| (opts & FLAG_INITIAL_DOWN)
|
|
|
|
) {
|
|
|
|
if (run_script(iface_status_str) != 0)
|
|
|
|
goto exiting;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Main loop */
|
|
|
|
netlink_pollfd[0].fd = netlink_fd;
|
|
|
|
netlink_pollfd[0].events = POLLIN;
|
|
|
|
delay_time = 0;
|
|
|
|
while (1) {
|
|
|
|
int iface_status_old;
|
|
|
|
|
|
|
|
switch (bb_got_signal) {
|
|
|
|
case SIGINT:
|
|
|
|
case SIGTERM:
|
|
|
|
bb_got_signal = 0;
|
|
|
|
goto cleanup;
|
|
|
|
case SIGQUIT:
|
|
|
|
bb_got_signal = 0;
|
|
|
|
goto exiting;
|
|
|
|
default:
|
|
|
|
bb_got_signal = 0;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (poll(netlink_pollfd,
|
|
|
|
(opts & FLAG_MONITOR) ? 1 : 0,
|
2009-11-07 22:00:14 +05:30
|
|
|
G.poll_time
|
2009-04-26 06:38:51 +05:30
|
|
|
) < 0
|
|
|
|
) {
|
|
|
|
if (errno == EINTR)
|
|
|
|
continue;
|
|
|
|
bb_perror_msg("poll");
|
|
|
|
goto exiting;
|
|
|
|
}
|
|
|
|
|
|
|
|
if ((opts & FLAG_MONITOR)
|
|
|
|
&& (netlink_pollfd[0].revents & POLLIN)
|
|
|
|
) {
|
2014-02-10 14:14:25 +05:30
|
|
|
int iface_exists_old;
|
|
|
|
|
|
|
|
iface_exists_old = G.iface_exists;
|
2009-04-26 06:38:51 +05:30
|
|
|
G.iface_exists = check_existence_through_netlink();
|
|
|
|
if (G.iface_exists < 0) /* error */
|
|
|
|
goto exiting;
|
|
|
|
if (iface_exists_old != G.iface_exists) {
|
|
|
|
bb_error_msg("interface %sappeared",
|
|
|
|
G.iface_exists ? "" : "dis");
|
|
|
|
if (G.iface_exists)
|
|
|
|
maybe_up_new_iface();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* note: if !G.iface_exists, returns DOWN */
|
2014-02-10 14:14:25 +05:30
|
|
|
iface_status_old = iface_status;
|
2009-04-26 06:38:51 +05:30
|
|
|
iface_status = detect_link();
|
|
|
|
if (iface_status == IFSTATUS_ERR) {
|
|
|
|
if (!(opts & FLAG_MONITOR))
|
|
|
|
goto exiting;
|
|
|
|
iface_status = IFSTATUS_DOWN;
|
|
|
|
}
|
|
|
|
iface_status_str = strstatus(iface_status);
|
|
|
|
|
|
|
|
if (iface_status_old != iface_status) {
|
|
|
|
bb_error_msg("link is %s", iface_status_str);
|
|
|
|
|
|
|
|
if (delay_time) {
|
|
|
|
/* link restored its old status before
|
2014-02-10 14:14:25 +05:30
|
|
|
* we ran script. don't run the script: */
|
2009-04-26 06:38:51 +05:30
|
|
|
delay_time = 0;
|
|
|
|
} else {
|
|
|
|
delay_time = monotonic_sec();
|
|
|
|
if (iface_status == IFSTATUS_UP)
|
|
|
|
delay_time += G.delay_up;
|
|
|
|
if (iface_status == IFSTATUS_DOWN)
|
|
|
|
delay_time += G.delay_down;
|
2014-02-10 14:14:25 +05:30
|
|
|
#if 0 /* if you are back in 1970... */
|
|
|
|
if (delay_time == 0) {
|
|
|
|
sleep(1);
|
|
|
|
delay_time = 1;
|
|
|
|
}
|
|
|
|
#endif
|
2009-04-26 06:38:51 +05:30
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (delay_time && (int)(monotonic_sec() - delay_time) >= 0) {
|
|
|
|
if (run_script(iface_status_str) != 0)
|
|
|
|
goto exiting;
|
2014-02-10 14:14:25 +05:30
|
|
|
delay_time = 0;
|
2009-04-26 06:38:51 +05:30
|
|
|
}
|
|
|
|
} /* while (1) */
|
|
|
|
|
|
|
|
cleanup:
|
|
|
|
if (!(opts & FLAG_NO_SHUTDOWN)
|
|
|
|
&& (iface_status == IFSTATUS_UP
|
|
|
|
|| (iface_status == IFSTATUS_DOWN && delay_time)
|
|
|
|
)
|
|
|
|
) {
|
|
|
|
setenv(IFPLUGD_ENV_PREVIOUS, strstatus(iface_status), 1);
|
|
|
|
setenv(IFPLUGD_ENV_CURRENT, strstatus(-1), 1);
|
|
|
|
run_script("down\0up"); /* reusing string */
|
|
|
|
}
|
|
|
|
|
|
|
|
exiting:
|
|
|
|
remove_pidfile(pidfile_name);
|
|
|
|
bb_error_msg_and_die("exiting");
|
|
|
|
}
|