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ifplugd: new applet by Maksym Kryzhanovskyy (xmaks AT email.cz)

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+3k code and 0.5k in messages. Most of the bloat due to compat :(
This commit is contained in:
Denis Vlasenko 2009-04-26 01:08:51 +00:00
parent 5bf59c104a
commit 71c165780a
5 changed files with 859 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/applets.h
View File

@ -189,6 +189,7 @@ IF_ID(APPLET(id, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
IF_IFCONFIG(APPLET(ifconfig, _BB_DIR_SBIN, _BB_SUID_NEVER))
IF_IFUPDOWN(APPLET_ODDNAME(ifdown, ifupdown, _BB_DIR_SBIN, _BB_SUID_NEVER, ifdown))
IF_IFENSLAVE(APPLET(ifenslave, _BB_DIR_SBIN, _BB_SUID_NEVER))
IF_IFPLUGD(APPLET(ifplugd, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
IF_IFUPDOWN(APPLET_ODDNAME(ifup, ifupdown, _BB_DIR_SBIN, _BB_SUID_NEVER, ifup))
IF_INETD(APPLET(inetd, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
IF_INIT(APPLET(init, _BB_DIR_SBIN, _BB_SUID_NEVER))

57
include/usage.h
View File

@ -1727,21 +1727,46 @@
/* "\n -r, --receive-slave Create a receive-only slave" */
#define ifenslave_example_usage \
"To create a bond device, simply follow these three steps :\n" \
"- ensure that the required drivers are properly loaded :\n" \
"To create a bond device, simply follow these three steps:\n" \
"- ensure that the required drivers are properly loaded:\n" \
" # modprobe bonding ; modprobe <3c59x|eepro100|pcnet32|tulip|...>\n" \
"- assign an IP address to the bond device :\n" \
"- assign an IP address to the bond device:\n" \
" # ifconfig bond0 <addr> netmask <mask> broadcast <bcast>\n" \
"- attach all the interfaces you need to the bond device :\n" \
"- attach all the interfaces you need to the bond device:\n" \
" # ifenslave bond0 eth0 eth1 eth2\n" \
" If bond0 didn't have a MAC address, it will take eth0's. Then, all\n" \
" interfaces attached AFTER this assignment will get the same MAC addr.\n\n" \
" To detach a dead interface without setting the bond device down :\n" \
" # ifenslave -d bond0 eth1\n\n" \
" To set the bond device down and automatically release all the slaves :\n" \
" # ifconfig bond0 down\n\n" \
" To change active slave :\n" \
" # ifenslave -c bond0 eth0\n" \
" To detach a dead interface without setting the bond device down:\n" \
" # ifenslave -d bond0 eth1\n\n" \
" To set the bond device down and automatically release all the slaves:\n" \
" # ifconfig bond0 down\n\n" \
" To change active slave:\n" \
" # ifenslave -c bond0 eth0\n" \
#define ifplugd_trivial_usage \
"[options]"
#define ifplugd_full_usage "\n\n" \
"Network interface plug detection daemon.\n\n" \
"Options:\n" \
"\n -n Do not daemonize" \
"\n -s Do not log to syslog" \
"\n -i IFACE Interface" \
"\n -f/-F Treat link detection error as link down/link up" \
"\n (otherwise exit on error)" \
"\n -a Do not up interface automatically" \
"\n -M Monitor creation/destruction of interface" \
"\n (otherwise it must exist)" \
"\n -r PROG Script to run" \
"\n -x ARG Extra argument for script" \
"\n -I Don't exit on nonzero exit code from script" \
"\n -p Don't run script on daemon startup" \
"\n -q Don't run script on daemon quit" \
"\n -l Run script on startup even if no cable is detected" \
"\n -t SECS Poll time in seconds" \
"\n -u SECS Delay before running script after link up" \
"\n -d SECS Delay after link down" \
"\n -m MODE API mode (mii, priv, ethtool, wlan, auto)" \
"\n -k Kill running daemon" \
#define ifup_trivial_usage \
"[-ain"IF_FEATURE_IFUPDOWN_MAPPING("m")"vf] ifaces..."
@ -4346,17 +4371,17 @@
"CMD: {add|del|change|replace|show}\n" \
"\n" \
"qdisc [ handle QHANDLE ] [ root |"IF_FEATURE_TC_INGRESS(" ingress |")" parent CLASSID ]\n" \
/* "\t[ estimator INTERVAL TIME_CONSTANT ]\n" */ \
"\t[ [ QDISC_KIND ] [ help | OPTIONS ] ]\n" \
"\tQDISC_KIND := { [p|b]fifo | tbf | prio | cbq | red | etc. }\n" \
/* "[ estimator INTERVAL TIME_CONSTANT ]\n" */ \
" [ [ QDISC_KIND ] [ help | OPTIONS ] ]\n" \
" QDISC_KIND := { [p|b]fifo | tbf | prio | cbq | red | etc. }\n" \
"qdisc show [ dev STRING ]"IF_FEATURE_TC_INGRESS(" [ingress]")"\n" \
"class [ classid CLASSID ] [ root | parent CLASSID ]\n" \
"\t[ [ QDISC_KIND ] [ help | OPTIONS ] ]\n" \
" [ [ QDISC_KIND ] [ help | OPTIONS ] ]\n" \
"class show [ dev STRING ] [ root | parent CLASSID ]\n" \
"filter [ pref PRIO ] [ protocol PROTO ]\n" \
/* "\t[ estimator INTERVAL TIME_CONSTANT ]\n" */ \
"\t[ root | classid CLASSID ] [ handle FILTERID ]\n" \
"\t[ [ FILTER_TYPE ] [ help | OPTIONS ] ]\n" \
" [ root | classid CLASSID ] [ handle FILTERID ]\n" \
" [ [ FILTER_TYPE ] [ help | OPTIONS ] ]\n" \
"filter show [ dev STRING ] [ root | parent CLASSID ]"
#define tcpsvd_trivial_usage \

6
networking/Config.in
View File

@ -303,6 +303,12 @@ config IFENSLAVE
Userspace application to bind several interfaces
to a logical interface (use with kernel bonding driver).
config IFPLUGD
bool "ifplugd"
default n
help
Network interface plug detection daemon.
config IFUPDOWN
bool "ifupdown"
default n

1
networking/Kbuild
View File

@ -18,6 +18,7 @@ lib-$(CONFIG_HOSTNAME) += hostname.o
lib-$(CONFIG_HTTPD) += httpd.o
lib-$(CONFIG_IFCONFIG) += ifconfig.o interface.o
lib-$(CONFIG_IFENSLAVE) += ifenslave.o interface.o
lib-$(CONFIG_IFPLUGD) += ifplugd.o
lib-$(CONFIG_IFUPDOWN) += ifupdown.o
lib-$(CONFIG_INETD) += inetd.o
lib-$(CONFIG_IP) += ip.o

810
networking/ifplugd.c Normal file
View File

@ -0,0 +1,810 @@
/* vi: set sw=4 ts=4: */
/*
* ifplugd for busybox
*
* Copyright (C) 2009
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include "libbb.h"
#include <linux/if.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>
#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
# define OPTION_STR "+ansfFi:r:It:u:d:m:pqlx:Mk"
#else
# define OPTION_STR "+ansfFi:r:It:u:d:m:pqlx:M"
#endif
enum { // api mode
API_AUTO = 'a',
API_ETHTOOL = 'e',
API_MII = 'm',
API_PRIVATE = 'p',
API_WLAN = 'w',
API_IFF = 'i',
};
enum { // interface status
IFSTATUS_ERR = -1,
IFSTATUS_DOWN = 0,
IFSTATUS_UP = 1,
};
enum { // constant fds
ioctl_fd = 3,
netlink_fd = 4,
};
struct globals {
smallint iface_last_status;
smallint iface_exists;
/* Used in getopt32, must have sizeof == sizeof(int) */
unsigned poll_time;
unsigned delay_up;
unsigned delay_down;
const char *iface;
const char *api_mode;
const char *script_name;
const char *extra_arg;
smallint (*detect_link_func)(void);
smallint (*cached_detect_link_func)(void);
};
#define G (*ptr_to_globals)
#define INIT_G() do { \
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
G.iface_last_status = -1; \
G.iface_exists = 1; \
G.poll_time = 1; \
G.delay_down = 5; \
G.iface = "eth0"; \
G.api_mode = "a"; \
G.script_name = "/etc/ifplugd/ifplugd.action"; \
} while (0)
static int run_script(const char *action)
{
pid_t pid;
int r;
bb_error_msg("executing '%s %s %s'", G.script_name, G.iface, action);
#if 1
pid = vfork();
if (pid < 0) {
bb_perror_msg("fork");
return -1;
}
if (pid == 0) {
/* child */
execlp(G.script_name, G.script_name, G.iface, action, G.extra_arg, NULL);
bb_perror_msg_and_die("can't execute '%s'", G.script_name);
}
/* parent */
wait(&r);
r = WEXITSTATUS(r);
bb_error_msg("exit code: %u", r);
return (option_mask32 & FLAG_IGNORE_RETVAL) ? 0 : r;
#else /* insanity */
struct fd_pair pipe_pair;
char buf[256];
int i = 0;
xpiped_pair(pipe_pair);
pid = vfork();
if (pid < 0) {
bb_perror_msg("fork");
return -1;
}
/* child */
if (pid == 0) {
xmove_fd(pipe_pair.wr, 1);
xdup2(1, 2);
if (pipe_pair.rd > 2)
close(pipe_pair.rd);
// umask(0022); // Set up a sane umask
execlp(G.script_name, G.script_name, G.iface, action, G.extra_arg, NULL);
_exit(EXIT_FAILURE);
}
/* parent */
close(pipe_pair.wr);
while (1) {
if (bb_got_signal && bb_got_signal != SIGCHLD) {
bb_error_msg("killing child");
kill(pid, SIGTERM);
bb_got_signal = 0;
break;
}
r = read(pipe_pair.rd, &buf[i], 1);
if (buf[i] == '\n' || i == sizeof(buf)-2 || r != 1) {
if (r == 1 && buf[i] != '\n')
i++;
buf[i] = '\0';
if (i > 0)
bb_error_msg("client: %s", buf);
i = 0;
} else {
i++;
}
if (r != 1)
break;
}
close(pipe_pair.rd);
wait(&r);
if (!WIFEXITED(r) || WEXITSTATUS(r) != 0) {
bb_error_msg("program execution failed, return value is %i",
WEXITSTATUS(r));
return option_mask32 & FLAG_IGNORE_RETVAL ? 0 : WEXITSTATUS(r);
}
bb_error_msg("program executed successfully");
return 0;
#endif
}
static int network_ioctl(int request, void* data)
{
return ioctl(ioctl_fd, request, data);
}
static void set_ifreq_to_ifname(struct ifreq *ifreq)
{
memset(ifreq, 0, sizeof(struct ifreq));
strncpy(ifreq->ifr_name, G.iface, IFNAMSIZ);
}
static const char *strstatus(int status)
{
if (status == IFSTATUS_ERR)
return "error";
return "down\0up" + (status * 5);
}
static void up_iface(void)
{
struct ifreq ifrequest;
if (!G.iface_exists)
return;
set_ifreq_to_ifname(&ifrequest);
if (network_ioctl(SIOCGIFFLAGS, &ifrequest) < 0) {
bb_perror_msg("can't %cet interface flags", 'g');
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) < 0)
bb_perror_msg_and_die("can't %cet interface flags", 's');
}
#if 0 /* why do we mess with IP addr? It's not our business */
if (network_ioctl(SIOCGIFADDR, &ifrequest) < 0) {
bb_error_msg("can't get interface address");
} 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;
if (network_ioctl(SIOCSIFADDR, &ifrequest) < 0)
bb_perror_msg("can't set interface address");
}
if (network_ioctl(SIOCGIFFLAGS, &ifrequest) < 0) {
bb_perror_msg("can't get interface flags");
return;
}
#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) == 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) == 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
G.cached_detect_link_func = NULL;
}
static smallint detect_link_mii(void)
{
struct ifreq ifreq;
set_ifreq_to_ifname(&ifreq);
if (network_ioctl(SIOCGMIIPHY, &ifreq) < 0) {
bb_perror_msg("SIOCGMIIPHY failed");
return IFSTATUS_ERR;
}
((unsigned short*)&ifreq.ifr_data)[1] = 1;
if (network_ioctl(SIOCGMIIREG, &ifreq) < 0) {
bb_perror_msg("SIOCGMIIREG failed");
return IFSTATUS_ERR;
}
return (((unsigned short*)&ifreq.ifr_data)[3] & 0x0004) ?
IFSTATUS_UP : IFSTATUS_DOWN;
}
static smallint detect_link_priv(void)
{
struct ifreq ifreq;
set_ifreq_to_ifname(&ifreq);
if (network_ioctl(SIOCDEVPRIVATE, &ifreq) < 0) {
bb_perror_msg("SIOCDEVPRIVATE failed");
return IFSTATUS_ERR;
}
((unsigned short*) &ifreq.ifr_data)[1] = 1;
if (network_ioctl(SIOCDEVPRIVATE+1, &ifreq) < 0) {
bb_perror_msg("SIOCDEVPRIVATE+1 failed");
return IFSTATUS_ERR;
}
return (((unsigned short*)&ifreq.ifr_data)[3] & 0x0004) ?
IFSTATUS_UP : IFSTATUS_DOWN;
}
static smallint detect_link_ethtool(void)
{
struct ifreq ifreq;
struct ethtool_value edata;
set_ifreq_to_ifname(&ifreq);
edata.cmd = ETHTOOL_GLINK;
ifreq.ifr_data = &edata;
if (network_ioctl(SIOCETHTOOL, &ifreq) < 0) {
bb_perror_msg("ETHTOOL_GLINK failed");
return IFSTATUS_ERR;
}
return edata.data ? IFSTATUS_UP : IFSTATUS_DOWN;
}
static smallint detect_link_iff(void)
{
struct ifreq ifreq;
set_ifreq_to_ifname(&ifreq);
if (network_ioctl(SIOCGIFFLAGS, &ifreq) < 0) {
bb_perror_msg("SIOCGIFFLAGS failed");
return IFSTATUS_ERR;
}
return (ifreq.ifr_flags & IFF_RUNNING) ? IFSTATUS_UP : IFSTATUS_DOWN;
}
static smallint detect_link_wlan(void)
{
struct iwreq iwrequest;
uint8_t mac[ETH_ALEN];
memset(&iwrequest, 0, sizeof(struct iwreq));
strncpy(iwrequest.ifr_ifrn.ifrn_name, G.iface, IFNAMSIZ);
if (network_ioctl(SIOCGIWAP, &iwrequest) < 0) {
bb_perror_msg("SIOCGIWAP failed");
return IFSTATUS_ERR;
}
memcpy(mac, &(iwrequest.u.ap_addr.sa_data), ETH_ALEN);
if (mac[0] == 0xFF || mac[0] == 0x44 || mac[0] == 0x00) {
for (int i = 1; i < ETH_ALEN; ++i) {
if (mac[i] != mac[0])
return IFSTATUS_UP;
}
return IFSTATUS_DOWN;
}
return IFSTATUS_UP;
}
static smallint detect_link_auto(void)
{
const char *method;
smallint iface_status;
smallint sv_logmode;
if (G.cached_detect_link_func) {
iface_status = G.cached_detect_link_func();
if (iface_status != IFSTATUS_ERR)
return iface_status;
}
sv_logmode = logmode;
logmode = LOGMODE_NONE;
iface_status = detect_link_ethtool();
if (iface_status != IFSTATUS_ERR) {
G.cached_detect_link_func = detect_link_ethtool;
method = "SIOCETHTOOL";
found_method:
logmode = sv_logmode;
bb_error_msg("using %s detection mode", method);
return iface_status;
}
iface_status = detect_link_mii();
if (iface_status != IFSTATUS_ERR) {
G.cached_detect_link_func = detect_link_mii;
method = "SIOCGMIIPHY";
goto found_method;
}
iface_status = detect_link_priv();
if (iface_status != IFSTATUS_ERR) {
G.cached_detect_link_func = detect_link_priv;
method = "SIOCDEVPRIVATE";
goto found_method;
}
iface_status = detect_link_wlan();
if (iface_status != IFSTATUS_ERR) {
G.cached_detect_link_func = detect_link_wlan;
method = "wireless extension";
goto found_method;
}
iface_status = detect_link_iff();
if (iface_status != IFSTATUS_ERR) {
G.cached_detect_link_func = detect_link_iff;
method = "IFF_RUNNING";
goto found_method;
}
logmode = sv_logmode;
return iface_status; /* IFSTATUS_ERR */
}
static smallint detect_link(void)
{
smallint status;
if (!G.iface_exists)
return (option_mask32 & FLAG_MONITOR) ? IFSTATUS_DOWN : IFSTATUS_ERR;
#if 0
/* Why? This behavior makes it hard to temporary down the iface.
* It makes a bit more sense to do only in maybe_up_new_iface.
* OTOH, maybe detect_link_wlan needs this. Then it should be done
* _only_ there.
*/
if (!(option_mask32 & FLAG_NO_AUTO))
up_iface();
#endif
status = G.detect_link_func();
if (status == IFSTATUS_ERR) {
if (option_mask32 & FLAG_IGNORE_FAIL)
status = IFSTATUS_DOWN;
if (option_mask32 & FLAG_IGNORE_FAIL_POSITIVE)
status = IFSTATUS_UP;
}
if (status == IFSTATUS_ERR
&& G.detect_link_func == detect_link_auto
) {
bb_error_msg("failed to detect link status");
}
if (status != G.iface_last_status) {
//TODO: is it safe to repeatedly do this?
setenv(IFPLUGD_ENV_PREVIOUS, strstatus(G.iface_last_status), 1);
setenv(IFPLUGD_ENV_CURRENT, strstatus(status), 1);
G.iface_last_status = status;
}
return status;
}
static NOINLINE int check_existence_through_netlink(void)
{
char replybuf[1024];
while (1) {
struct nlmsghdr *mhdr;
ssize_t bytes;
bytes = recv(netlink_fd, &replybuf, sizeof(replybuf), MSG_DONTWAIT);
if (bytes < 0) {
if (errno == EAGAIN)
return G.iface_exists;
if (errno == EINTR)
continue;
bb_perror_msg("netlink: recv");
return -1;
}
mhdr = (struct nlmsghdr*)replybuf;
while (bytes > 0) {
if (!NLMSG_OK(mhdr, bytes)
|| bytes < sizeof(struct nlmsghdr)
|| bytes < mhdr->nlmsg_len
) {
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;
struct ifinfomsg *imsg;
int attr_len;
imsg = NLMSG_DATA(mhdr);
if (mhdr->nlmsg_len < NLMSG_LENGTH(sizeof(struct ifinfomsg))) {
bb_error_msg("netlink packet too small or truncated");
return -1;
}
attr = (struct rtattr*)((char*)imsg + NLMSG_ALIGN(sizeof(struct ifinfomsg)));
attr_len = NLMSG_PAYLOAD(mhdr, sizeof(struct ifinfomsg));
while (RTA_OK(attr, attr_len)) {
if (attr->rta_type == IFLA_IFNAME) {
char ifname[IFNAMSIZ + 1];
int len = RTA_PAYLOAD(attr);
if (len > IFNAMSIZ)
len = IFNAMSIZ;
memcpy(ifname, RTA_DATA(attr), len);
if (strcmp(G.iface, ifname) == 0) {
G.iface_exists = (mhdr->nlmsg_type == RTM_NEWLINK);
}
}
attr = RTA_NEXT(attr, attr_len);
}
}
mhdr = NLMSG_NEXT(mhdr, bytes);
}
}
return G.iface_exists;
}
static NOINLINE int netlink_open(void)
{
int fd;
struct sockaddr_nl addr;
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));
return fd;
}
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;
}
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;
#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);
applet_name = xasprintf("ifplugd(%s)", G.iface);
#if ENABLE_FEATURE_PIDFILE
pidfile_name = xasprintf(_PATH_VARRUN"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);
return EXIT_SUCCESS;
}
if (pid_from_pidfile > 0 && kill(pid_from_pidfile, 0) == 0)
bb_error_msg_and_die("daemon already running");
#endif
switch (G.api_mode[0]) {
case API_AUTO:
G.detect_link_func = detect_link_auto;
break;
case API_ETHTOOL:
G.detect_link_func = detect_link_ethtool;
break;
case API_MII:
G.detect_link_func = detect_link_mii;
break;
case API_PRIVATE:
G.detect_link_func = detect_link_priv;
break;
case API_WLAN:
G.detect_link_func = detect_link_wlan;
break;
case API_IFF:
G.detect_link_func = detect_link_iff;
break;
default:
bb_error_msg_and_die("unknown API mode '%s'", G.api_mode);
}
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) {
xmove_fd(netlink_open(), netlink_fd);
}
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);
G.iface_exists = (network_ioctl(SIOCGIFINDEX, &ifrequest) == 0);
}
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;
int iface_exists_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,
G.poll_time * 1000
) < 0
) {
if (errno == EINTR)
continue;
bb_perror_msg("poll");
goto exiting;
}
iface_status_old = iface_status;
iface_exists_old = G.iface_exists;
if ((opts & FLAG_MONITOR)
&& (netlink_pollfd[0].revents & POLLIN)
) {
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 */
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
* we run script. don't run the script: */
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;
if (delay_time == 0)
delay_time++;
}
}
if (delay_time && (int)(monotonic_sec() - delay_time) >= 0) {
delay_time = 0;
if (run_script(iface_status_str) != 0)
goto exiting;
}
} /* 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");
}