*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+//config:config IFPLUGD
+//config: bool "ifplugd"
+//config: default y
+//config: select PLATFORM_LINUX
+//config: help
+//config: Network interface plug detection daemon.
+
+//applet:IF_IFPLUGD(APPLET(ifplugd, BB_DIR_USR_SBIN, BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_IFPLUGD) += ifplugd.o
+
+//usage:#define ifplugd_trivial_usage
+//usage: "[OPTIONS]"
+//usage:#define ifplugd_full_usage "\n\n"
+//usage: "Network interface plug detection daemon\n"
+//usage: "\n -n Don't daemonize"
+//usage: "\n -s Don't log to syslog"
+//usage: "\n -i IFACE Interface"
+//usage: "\n -f/-F Treat link detection error as link down/link up"
+//usage: "\n (otherwise exit on error)"
+//usage: "\n -a Don't up interface at each link probe"
+//usage: "\n -M Monitor creation/destruction of interface"
+//usage: "\n (otherwise it must exist)"
+//usage: "\n -r PROG Script to run"
+//usage: "\n -x ARG Extra argument for script"
+//usage: "\n -I Don't exit on nonzero exit code from script"
+//usage: "\n -p Don't run \"up\" script on startup"
+//usage: "\n -q Don't run \"down\" script on exit"
+//usage: "\n -l Always run script on startup"
+//usage: "\n -t SECS Poll time in seconds"
+//usage: "\n -u SECS Delay before running script after link up"
+//usage: "\n -d SECS Delay after link down"
+//usage: "\n -m MODE API mode (mii, priv, ethtool, wlan, iff, auto)"
+//usage: "\n -k Kill running daemon"
+
#include "libbb.h"
#include "fix_u32.h"
#include <linux/if.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
-#include <net/ethernet.h>
+#ifdef HAVE_NET_ETHERNET_H
+/* musl breakage:
+ * In file included from /usr/include/net/ethernet.h:10,
+ * from networking/ifplugd.c:41:
+ * /usr/include/netinet/if_ether.h:96: error: redefinition of 'struct ethhdr'
+ *
+ * Build succeeds without it on musl. Commented it out.
+ * If on your system you need it, consider removing <linux/ethtool.h>
+ * and copy-pasting its definitions here (<linux/ethtool.h> is what pulls in
+ * conflicting definition of struct ethhdr on musl).
+ */
+/* # include <net/ethernet.h> */
+#endif
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/sockios.h>
#define __user
#include <linux/wireless.h>
+#ifndef ETH_ALEN
+# define ETH_ALEN 6
+#endif
+
/*
From initial port to busybox, removed most of the redundancy by
converting implementation of a polymorphic interface to the strict
#endif
};
#if ENABLE_FEATURE_PIDFILE
-# define OPTION_STR "+ansfFi:r:It:u:d:m:pqlx:Mk"
+# define OPTION_STR "+ansfFi:r:It:+u:+d:+m:pqlx:Mk"
#else
-# define OPTION_STR "+ansfFi:r:It:u:d:m:pqlx:M"
+# define OPTION_STR "+ansfFi:r:It:+u:+d:+m:pqlx:M"
#endif
enum { // interface status
{
/* char buffer instead of bona-fide struct avoids aliasing warning */
char buf[sizeof(struct ifreq)];
- struct ifreq *ifreq = (void *)buf;
+ struct ifreq *const ifreq = (void *)buf;
+
struct mii_ioctl_data *mii = (void *)&ifreq->ifr_data;
set_ifreq_to_ifname(ifreq);
{
/* char buffer instead of bona-fide struct avoids aliasing warning */
char buf[sizeof(struct ifreq)];
- struct ifreq *ifreq = (void *)buf;
+ struct ifreq *const ifreq = (void *)buf;
+
struct mii_ioctl_data *mii = (void *)&ifreq->ifr_data;
set_ifreq_to_ifname(ifreq);
{ "IFF_RUNNING" , &detect_link_iff },
};
-
-
static const char *strstatus(int status)
{
if (status == IFSTATUS_ERR)
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 (network_ioctl(SIOCSIFFLAGS, &ifrequest, "setting interface flags") < 0) {
+ if (errno != ENODEV)
+ xfunc_die();
+ G.iface_exists = 0;
+ return;
+ }
}
#if 0 /* why do we mess with IP addr? It's not our business */
static NOINLINE int check_existence_through_netlink(void)
{
int iface_len;
- char replybuf[1024];
+ /* 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);
iface_len = strlen(G.iface);
while (1) {
struct nlmsghdr *mhdr;
ssize_t bytes;
- bytes = recv(netlink_fd, &replybuf, sizeof(replybuf), MSG_DONTWAIT);
+ bytes = recv(netlink_fd, replybuf, BUF_SIZE, MSG_DONTWAIT);
if (bytes < 0) {
if (errno == EAGAIN)
- return G.iface_exists;
+ goto ret;
if (errno == EINTR)
continue;
-
bb_perror_msg("netlink: recv");
return -1;
}
}
}
+ ret:
+ free(replybuf);
return G.iface_exists;
}
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);
applet_name = xasprintf("ifplugd(%s)", G.iface);
#if ENABLE_FEATURE_PIDFILE
- pidfile_name = xasprintf(_PATH_VARRUN"ifplugd.%s.pid", G.iface);
+ pidfile_name = xasprintf(CONFIG_PID_FILE_PATH "/ifplugd.%s.pid", G.iface);
pid_from_pidfile = read_pid(pidfile_name);
if (opts & FLAG_KILL) {
if (pid_from_pidfile > 0)
- kill(pid_from_pidfile, SIGQUIT);
+ /* Upstream tool use SIGINT for -k */
+ kill(pid_from_pidfile, SIGINT);
return EXIT_SUCCESS;
}
delay_time = 0;
while (1) {
int iface_status_old;
- int iface_exists_old;
switch (bb_got_signal) {
case SIGINT:
goto exiting;
}
- iface_status_old = iface_status;
- iface_exists_old = G.iface_exists;
-
if ((opts & FLAG_MONITOR)
&& (netlink_pollfd[0].revents & POLLIN)
) {
+ int iface_exists_old;
+
+ iface_exists_old = G.iface_exists;
G.iface_exists = check_existence_through_netlink();
if (G.iface_exists < 0) /* error */
goto exiting;
}
/* note: if !G.iface_exists, returns DOWN */
+ iface_status_old = iface_status;
iface_status = detect_link();
if (iface_status == IFSTATUS_ERR) {
if (!(opts & FLAG_MONITOR))
if (delay_time) {
/* link restored its old status before
- * we run script. don't run the script: */
+ * we ran script. don't run the script: */
delay_time = 0;
} else {
delay_time = monotonic_sec();
delay_time += G.delay_up;
if (iface_status == IFSTATUS_DOWN)
delay_time += G.delay_down;
- if (delay_time == 0)
- delay_time++;
+#if 0 /* if you are back in 1970... */
+ if (delay_time == 0) {
+ sleep(1);
+ delay_time = 1;
+ }
+#endif
}
}
if (delay_time && (int)(monotonic_sec() - delay_time) >= 0) {
- delay_time = 0;
if (run_script(iface_status_str) != 0)
goto exiting;
+ delay_time = 0;
}
} /* while (1) */
projects / oweals / busybox.git / blobdiff