ntpd: improve postponed hostname resolution
Run the namelookup from the main loop so a misspelled first ntp server
name does not block everything forever.
This fixes the following situation which would block forever:
$ sudo ./busybox ntpd -dn -p foobar -p pool.ntp.org
ntpd: bad address 'foobar'
ntpd: bad address 'foobar'
ntpd: bad address 'foobar'
...
New behavior:
ntpd: bad address 'foobar'
ntpd: sending query to 137.190.2.4
ntpd: reply from 137.190.2.4: offset:-1.009775 delay:0.175550 status:0x24 strat:1 refid:0x00535047 rootdelay:0.000000 reach:0x01
ntpd: sending query to 137.190.2.4
ntpd: reply from 137.190.2.4: offset:-1.009605 delay:0.175461 status:0x24 strat:1 refid:0x00535047 rootdelay:0.000000 reach:0x03
ntpd: sending query to 137.190.2.4
ntpd: reply from 137.190.2.4: offset:-1.005327 delay:0.167027 status:0x24 strat:1 refid:0x00535047 rootdelay:0.000000 reach:0x07
ntpd: sending query to 137.190.2.4
ntpd: bad address 'foobar'
ntpd: reply from 137.190.2.4: offset:-1.046349 delay:0.248705 status:0x24 strat:1 refid:0x00535047 rootdelay:0.000000 reach:0x0f
This patch is based on Kaarle Ritvanens work.
http://lists.busybox.net/pipermail/busybox/2016-May/084197.html
function old new delta
ntpd_main 1061 1079 +18
ntp_init 556 560 +4
resolve_peer_hostname 81 75 -6
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/1 up/down: 22/-6) Total: 16 bytes
Signed-off-by: Kaarle Ritvanen <kaarle.ritvanen@datakunkku.fi>
Signed-off-by: Natanael Copa <ncopa@alpinelinux.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
1 file changed