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-rw-r--r--networking/ntpd.c27
1 files changed, 20 insertions, 7 deletions
diff --git a/networking/ntpd.c b/networking/ntpd.c
index 59607ed23..cfe695631 100644
--- a/networking/ntpd.c
+++ b/networking/ntpd.c
@@ -29,7 +29,7 @@
*/
//usage:#define ntpd_trivial_usage
-//usage: "[-dnqNw"IF_FEATURE_NTPD_SERVER("l")"] [-S PROG] [-p PEER]..."
+//usage: "[-dnqNw"IF_FEATURE_NTPD_SERVER("l -I IFACE")"] [-S PROG] [-p PEER]..."
//usage:#define ntpd_full_usage "\n\n"
//usage: "NTP client/server\n"
//usage: "\n -d Verbose"
@@ -39,6 +39,7 @@
//usage: "\n -w Do not set time (only query peers), implies -n"
//usage: IF_FEATURE_NTPD_SERVER(
//usage: "\n -l Run as server on port 123"
+//usage: "\n -I IFACE Bind server to IFACE, implies -l"
//usage: )
//usage: "\n -S PROG Run PROG after stepping time, stratum change, and every 11 mins"
//usage: "\n -p PEER Obtain time from PEER (may be repeated)"
@@ -283,6 +284,7 @@ enum {
OPT_p = (1 << 5),
OPT_S = (1 << 6),
OPT_l = (1 << 7) * ENABLE_FEATURE_NTPD_SERVER,
+ OPT_I = (1 << 8) * ENABLE_FEATURE_NTPD_SERVER,
/* We hijack some bits for other purposes */
OPT_qq = (1 << 31),
};
@@ -301,6 +303,7 @@ struct globals {
llist_t *ntp_peers;
#if ENABLE_FEATURE_NTPD_SERVER
int listen_fd;
+ char *if_name;
# define G_listen_fd (G.listen_fd)
#else
# define G_listen_fd (-1)
@@ -2092,13 +2095,19 @@ static NOINLINE void ntp_init(char **argv)
/* Parse options */
peers = NULL;
- opt_complementary = "dd:p::wn"; /* d: counter; p: list; -w implies -n */
+ opt_complementary = "dd:p::wn" /* -d: counter; -p: list; -w implies -n */
+ IF_FEATURE_NTPD_SERVER(":Il"); /* -I implies -l */
opts = getopt32(argv,
"nqNx" /* compat */
"wp:S:"IF_FEATURE_NTPD_SERVER("l") /* NOT compat */
+ IF_FEATURE_NTPD_SERVER("I:") /* compat */
"d" /* compat */
"46aAbgL", /* compat, ignored */
- &peers, &G.script_name, &G.verbose);
+ &peers,&G.script_name,
+#if ENABLE_FEATURE_NTPD_SERVER
+ &G.if_name,
+#endif
+ &G.verbose);
// if (opts & OPT_x) /* disable stepping, only slew is allowed */
// G.time_was_stepped = 1;
@@ -2130,18 +2139,22 @@ static NOINLINE void ntp_init(char **argv)
/* -l but no peers: "stratum 1 server" mode */
G.stratum = 1;
}
- if (!(opts & OPT_n)) {
- bb_daemonize_or_rexec(DAEMON_DEVNULL_STDIO, argv);
- logmode = LOGMODE_NONE;
- }
#if ENABLE_FEATURE_NTPD_SERVER
G_listen_fd = -1;
if (opts & OPT_l) {
G_listen_fd = create_and_bind_dgram_or_die(NULL, 123);
+ if (opts & OPT_I) {
+ if (setsockopt_bindtodevice(G_listen_fd, G.if_name))
+ xfunc_die();
+ }
socket_want_pktinfo(G_listen_fd);
setsockopt(G_listen_fd, IPPROTO_IP, IP_TOS, &const_IPTOS_LOWDELAY, sizeof(const_IPTOS_LOWDELAY));
}
#endif
+ if (!(opts & OPT_n)) {
+ bb_daemonize_or_rexec(DAEMON_DEVNULL_STDIO, argv);
+ logmode = LOGMODE_NONE;
+ }
/* I hesitate to set -20 prio. -15 should be high enough for timekeeping */
if (opts & OPT_N)
setpriority(PRIO_PROCESS, 0, -15);