ntpd: allow peer-less (standalone stratum 1 server) operation

Based on patch by Jean-Christophe Dubois (jcd@tribudubois.net)

function                                             old     new   delta
ntp_init                                             384     399     +15
recv_and_process_client_pkt                          469     480     +11

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 11 insertions, 2 deletions

diff --git a/networking/ntpd.c b/networking/ntpd.c
index 6707e9bdb..ca4afa045 100644
--- a/networking/ntpd.c
+++ b/networking/ntpd.c
@@ -1765,6 +1765,10 @@ recv_and_process_client_pkt(void /*int fd*/)
         /* this time was obtained between poll() and recv() */
         msg.m_rectime = d_to_lfp(G.cur_time);
         msg.m_xmttime = d_to_lfp(gettime1900d()); /* this instant */
+        if (G.peer_cnt == 0) {
+                /* we have no peers: "stratum 1 server" mode. reftime = our own time */
+                G.reftime = G.cur_time;
+        }
         msg.m_reftime = d_to_lfp(G.reftime);
         msg.m_orgtime = query_xmttime;
         msg.m_rootdelay = d_to_sfp(G.rootdelay);
@@ -1902,8 +1906,13 @@ static NOINLINE void ntp_init(char **argv)
                 bb_show_usage();
 //      if (opts & OPT_x) /* disable stepping, only slew is allowed */
 //              G.time_was_stepped = 1;
-        while (peers)
-                add_peers(llist_pop(&peers));
+        if (peers) {
+                while (peers)
+                        add_peers(llist_pop(&peers));
+        } else {
+                /* -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;