Hi, I recently upgraded two servers at work from OpenBSD 5.2 to 5.4 and got problems on both of the machines that are related to the new asynchronous resolver in libc.
1. this machnie is SMTP server for a subpart of our domains, running sendmail. It receives the mail from the outside (and runs spamd) and delivers the messages to internal mail box servers, according to the alias map which has entries in the form joe: joe@servera This setup has worked perfectly for years under various OSs and also worked under 5.2. Under 5.4 I get errors like this one from sendmail: Jan 13 13:00:02 smtp sm-mta[12261]: s0DC02FV014174: to=joe@servera, delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=32928, relay=servera, dsn=5.1.2, stat=Host unknown (Name server: servera: host not found) And looking at DNS requests I see that sendmail is only emitting MX queries for 'servera' and 'servera.mydomain.fr' but no AAAA or A queries. 2. the second issue is with the dhcpd server. We assign static IPv4 addresses to about 2000 machines based on their MAC address. For historical reasons the dhcpd.conf file has host names, not IP addresses, so dhcpd has to resolve all names before starting. Again in 5.2 this was working. (dhcpd startup is a bit slow but that's ok). Now in 5.4 in only starts once over 2 or 3 attempts, and the other cases fail because it randomly can't resolve one of the names. Jan 13 15:39:35 dhcp dhcpd[9242]: /etc/dhcpd.conf line 4553: fr (265): could not resolve hostname Jan 13 15:39:35 dhcp dhcpd[9242]: fixed-address foo.mydomain.fr; Jan 13 15:51:19 nairobi dhcpd[15375]: ^ Jan 13 15:51:26 nairobi dhcpd[15375]: Configuration file errors encountered Jan 13 15:51:26 nairobi dhcpd[15375]: exiting. I guess a timeout in the new ASR code is shorter than in the old code or something, causing those random failures. I know I can "fix" both issues by changing the way things are handled, but in both cases what I do is legal (even if not optimal) and I'd rather see those issues fixed in OpenBSD. I'm willing to test patches... -- Matthieu Herrb
