*
* Copyright (C) 2009 Maksym Kryzhanovskyy <xmaks@email.cz>
*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+
+//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
+# include <net/ethernet.h>
+#endif
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/sockios.h>
static smallint detect_link_mii(void)
{
- struct ifreq ifreq;
- struct mii_ioctl_data *mii = (void *)&ifreq.ifr_data;
+ /* char buffer instead of bona-fide struct avoids aliasing warning */
+ char buf[sizeof(struct ifreq)];
+ struct ifreq *const ifreq = (void *)buf;
- set_ifreq_to_ifname(&ifreq);
+ struct mii_ioctl_data *mii = (void *)&ifreq->ifr_data;
+
+ set_ifreq_to_ifname(ifreq);
- if (network_ioctl(SIOCGMIIPHY, &ifreq, "SIOCGMIIPHY") < 0) {
+ if (network_ioctl(SIOCGMIIPHY, ifreq, "SIOCGMIIPHY") < 0) {
return IFSTATUS_ERR;
}
mii->reg_num = 1;
- if (network_ioctl(SIOCGMIIREG, &ifreq, "SIOCGMIIREG") < 0) {
+ if (network_ioctl(SIOCGMIIREG, ifreq, "SIOCGMIIREG") < 0) {
return IFSTATUS_ERR;
}
static smallint detect_link_priv(void)
{
- struct ifreq ifreq;
- struct mii_ioctl_data *mii = (void *)&ifreq.ifr_data;
+ /* char buffer instead of bona-fide struct avoids aliasing warning */
+ char buf[sizeof(struct ifreq)];
+ struct ifreq *const ifreq = (void *)buf;
- set_ifreq_to_ifname(&ifreq);
+ struct mii_ioctl_data *mii = (void *)&ifreq->ifr_data;
+
+ set_ifreq_to_ifname(ifreq);
- if (network_ioctl(SIOCDEVPRIVATE, &ifreq, "SIOCDEVPRIVATE") < 0) {
+ if (network_ioctl(SIOCDEVPRIVATE, ifreq, "SIOCDEVPRIVATE") < 0) {
return IFSTATUS_ERR;
}
mii->reg_num = 1;
- if (network_ioctl(SIOCDEVPRIVATE+1, &ifreq, "SIOCDEVPRIVATE+1") < 0) {
+ if (network_ioctl(SIOCDEVPRIVATE+1, ifreq, "SIOCDEVPRIVATE+1") < 0) {
return IFSTATUS_ERR;
}
{ "IFF_RUNNING" , &detect_link_iff },
};
-
-
static const char *strstatus(int status)
{
if (status == IFSTATUS_ERR)
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;
}
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