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>>>>> davelasker writes:

davelasker> My company uses a very simple http browser implemenation written in
davelasker> gnu C++ to asynchronously post data to customers. We use
davelasker> gethostbyname_r to convert FQDN to IP address, then set up a socket,
davelasker> set the headers, send the data, etc.

davelasker> One of our customers has a host name with a trailing hypen,i.e their
davelasker> FQDN is like

davelasker> foo-.bar.com

davelasker> The various glibc library DNS lookup functions fail when looking up
davelasker> this FQDN. I tried gethostbyname_r and getaddrinfo. gethostbyname_r
davelasker> returns NO_RECOVERY. getaddrinfo returns EAI_NONAME. I've tried this
davelasker> on RH 6.2, and on RHEL 3 and 4.

davelasker> nslookup, host, and dig all find this name with no problem.

davelasker> AFAIKT from looking at IETF specs, the trailing hyphen is illegal.
davelasker> But
davelasker> I don't want to have to tell my customer to change his hostname.

davelasker> What are the nslookup, host, and dig commands doing differently to
davelasker> lookup the name than what is done in the glibc
davelasker> functions?

They're doing DNS queries without using glibc get...() routines. To fix
this issue at your end, you've to patch /lib{64,}/libnss_dns.so* which
is provided by glibc.

davelasker> Thanks for the help!

HTH
- --
Ashish Shukla आशीष शुक्ल http://wahjava.wordpress.com/
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