*
* 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.
*/
+//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 { // api mode
- API_AUTO = 'a',
- API_ETHTOOL = 'e',
- API_MII = 'm',
- API_PRIVATE = 'p',
- API_WLAN = 'w',
- API_IFF = 'i',
-};
-static const char api_modes[] ALIGN1 = "aempwi";
-
enum { // interface status
IFSTATUS_ERR = -1,
IFSTATUS_DOWN = 0,
const char *api_mode;
const char *script_name;
const char *extra_arg;
-
- smallint (*detect_link_func)(void);
};
#define G (*ptr_to_globals)
#define INIT_G() do { \
} while (0)
-static const char *strstatus(int status)
-{
- if (status == IFSTATUS_ERR)
- return "error";
- return "down\0up" + (status * 5);
-}
+/* Utility routines */
-static int run_script(const char *action)
+static void set_ifreq_to_ifname(struct ifreq *ifreq)
{
- 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;
+ memset(ifreq, 0, sizeof(struct ifreq));
+ strncpy_IFNAMSIZ(ifreq->ifr_name, G.iface);
}
static int network_ioctl(int request, void* data, const char *errmsg)
return r;
}
-static void set_ifreq_to_ifname(struct ifreq *ifreq)
-{
- memset(ifreq, 0, sizeof(struct ifreq));
- strncpy_IFNAMSIZ(ifreq->ifr_name, G.iface);
-}
-
-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_method_num == 0)
- G.detect_link_func = NULL;
-}
+/* Link detection routines and table */
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;
- if (network_ioctl(SIOCDEVPRIVATE, &ifreq, "SIOCDEVPRIVATE") < 0) {
+ set_ifreq_to_ifname(ifreq);
+
+ 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;
}
return IFSTATUS_UP;
}
+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) {
+ if (errno != ENODEV)
+ xfunc_die();
+ G.iface_exists = 0;
+ return;
+ }
+ }
+
+#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;
+}
+
static smallint detect_link(void)
{
- static const struct {
- const char *name;
- smallint (*func)(void);
- } method[] = {
- { "SIOCETHTOOL" , &detect_link_ethtool },
- { "SIOCGMIIPHY" , &detect_link_mii },
- { "SIOCDEVPRIVATE" , &detect_link_priv },
- { "wireless extension", &detect_link_wlan },
- { "IFF_RUNNING" , &detect_link_iff },
- };
smallint status;
if (!G.iface_exists)
if (!(option_mask32 & FLAG_NO_AUTO))
up_iface();
- if (!G.detect_link_func) {
- if (G.api_method_num == 0) {
- int i;
- smallint sv_logmode;
-
- sv_logmode = logmode;
- for (i = 0; i < ARRAY_SIZE(method); i++) {
- logmode = LOGMODE_NONE;
- status = method[i].func();
- logmode = sv_logmode;
- if (status != IFSTATUS_ERR) {
- G.detect_link_func = method[i].func;
- bb_error_msg("using %s detection mode", method[i].name);
- goto _2;
- }
+ 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;
}
- goto _1;
}
- G.detect_link_func = method[G.api_method_num - 1].func;
+ } else {
+ status = method_table[G.api_method_num].func();
}
- status = G.detect_link_func();
- _1:
if (status == IFSTATUS_ERR) {
if (option_mask32 & FLAG_IGNORE_FAIL)
status = IFSTATUS_DOWN;
else if (option_mask32 & FLAG_IGNORE_FAIL_POSITIVE)
status = IFSTATUS_UP;
- else if (G.api_method_num == 0)
+ else if (G.api_mode[0] == 'a')
bb_error_msg("can't detect link status");
}
- _2:
+
if (status != G.iface_last_status) {
G.iface_prev_status = G.iface_last_status;
G.iface_last_status = status;
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;
}
-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;
-}
-
#if ENABLE_FEATURE_PIDFILE
static NOINLINE pid_t read_pid(const char *filename)
{
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;
}
if (pid_from_pidfile > 0 && kill(pid_from_pidfile, 0) == 0)
bb_error_msg_and_die("daemon already running");
#endif
+
api_mode_found = strchr(api_modes, G.api_mode[0]);
if (!api_mode_found)
bb_error_msg_and_die("unknown API mode '%s'", G.api_mode);
xmove_fd(xsocket(AF_INET, SOCK_DGRAM, 0), ioctl_fd);
if (opts & FLAG_MONITOR) {
- xmove_fd(netlink_open(), netlink_fd);
+ 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);
}
write_pidfile(pidfile_name);
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