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ntpd: do not use a peer more than once (say, if two peers resolve to the same IP)

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function                                             old     new   delta
add_peers                                             98     166     +68

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2016-03-04 07:06:53 +01:00
parent 4c48a64747
commit f37f28199f
1 changed files with 16 additions and 1 deletions
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17
networking/ntpd.c
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@ -727,7 +727,7 @@ reset_peer_stats(peer_t *p, double offset)
/* Used to set p->filter_datapoint[i].d_dispersion = MAXDISP
* and clear reachable bits, but this proved to be too agressive:
* after step (tested with suspinding laptop for ~30 secs),
* after step (tested with suspending laptop for ~30 secs),
* this caused all previous data to be considered invalid,
* making us needing to collect full ~8 datapoins per peer
* after step in order to start trusting them.
@ -766,11 +766,26 @@ reset_peer_stats(peer_t *p, double offset)
static void
add_peers(const char *s)
{
llist_t *item;
peer_t *p;
p = xzalloc(sizeof(*p));
p->p_lsa = xhost2sockaddr(s, 123);
p->p_dotted = xmalloc_sockaddr2dotted_noport(&p->p_lsa->u.sa);
/* Names like N.<country2chars>.pool.ntp.org are randomly resolved
* to a pool of machines. Sometimes different N's resolve to the same IP.
* It is not useful to have two peers with same IP. We skip duplicates.
*/
for (item = G.ntp_peers; item != NULL; item = item->link) {
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);
return;
}
}
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); */