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From c8641962e4cbde48108ddfc1c105e3320778190d Mon Sep 17 00:00:00 2001
From: Denys Vlasenko <vda.linux@googlemail.com>
Date: Fri, 4 Mar 2016 07:26:08 +0100
Subject: [PATCH 4006/4007] ntpd: if peer does not reply anymore, try
 re-resolving its hostname

function                                             old     new   delta
ntpd_main                                           1053    1130     +77
add_peers                                            166     195     +29

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
---
 networking/ntpd.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/networking/ntpd.c b/networking/ntpd.c
index 517806e..4103189 100644
--- a/networking/ntpd.c
+++ b/networking/ntpd.c
@@ -267,6 +267,7 @@ typedef struct {
 
 typedef struct {
 	len_and_sockaddr *p_lsa;
+	char             *p_hostname;
 	char             *p_dotted;
 	int              p_fd;
 	int              datapoint_idx;
@@ -781,11 +782,14 @@ add_peers(const char *s)
 		peer_t *pp = (peer_t *) item->data;
 		if (strcmp(p->p_dotted, pp->p_dotted) == 0) {
 			bb_error_msg("duplicate peer %s (%s)", s, p->p_dotted);
+			free(p->p_lsa);
+			free(p->p_dotted);
 			free(p);
 			return;
 		}
 	}
 
+	p->p_hostname = xstrdup(s);
 	p->p_fd = -1;
 	p->p_xmt_msg.m_status = MODE_CLIENT | (NTP_VERSION << 3);
 	p->next_action_time = G.cur_time; /* = set_next(p, 0); */
@@ -2332,6 +2336,21 @@ int ntpd_main(int argc UNUSED_PARAM, char **argv)
 					timeout = poll_interval(NOREPLY_INTERVAL);
 					bb_error_msg("timed out waiting for %s, reach 0x%02x, next query in %us",
 							p->p_dotted, p->reachable_bits, timeout);
+
+					/* What if don't see it because it changed its IP? */
+					if (p->reachable_bits == 0) {
+						len_and_sockaddr *lsa = host2sockaddr(p->p_hostname, 123);
+						if (lsa) {
+							char *dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
+							//if (strcmp(dotted, p->p_dotted) != 0)
+							//	bb_error_msg("peer IP changed");
+							free(p->p_lsa);
+							free(p->p_dotted);
+							p->p_lsa = lsa;
+							p->p_dotted = dotted;
+						}
+					}
+
 					set_next(p, timeout);
 				}
 			}
-- 
2.8.3