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ntpd: if peer does not reply anymore, try re-resolving its hostname

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

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2016-03-04 07:26:08 +01:00
parent f37f28199f
commit c8641962e4
1 changed files with 19 additions and 0 deletions
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19
networking/ntpd.c
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@ -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);
}
}