eandres at google
Mar 25, 2009, 8:36 AM
Post #1 of 1
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[Bug 831] New: hosts_find_bydns does not support trailing '.' on DNS names
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http://bugs.exim.org/show_bug.cgi?id=831
Summary: hosts_find_bydns does not support trailing '.' on DNS
names
Product: Exim
Version: 4.69
Platform: All
OS/Version: All
Status: NEW
Severity: bug
Priority: medium
Component: Lookups
AssignedTo: nigel[at]exim.org
ReportedBy: eandres[at]google.com
CC: exim-dev[at]exim.org, eandres[at]google.com
The 'bydns' host resolution method rejects names in the form of:
foohost1.domain.com.
That is, containing a trailing '.'. This is used to indicate that no search
paths should be applied, and is still a valid DNS name. However, the regex
rejects these:
uschar *check_dns_names_pattern=
US"(?i)^(?>(?(1)\\.|())[^\\W_](?>[a-z0-9/-]*[^\\W_])?)+$";
With the error message:
finding IP address for foohost1.domain.com.:15600
host=foohost1.domain.com. port=15600
doing DNS lookup
DNS name syntax check failed: foohost1.domain.com. (A)
smarthost router: defer for quux[at]google.com
message: lookup of host "foohost1.domain.com." failed in smarthost router:
syntax error in name
It is not known to me if the code beyond this regex similarly has difficulty
with the trailing '.'.
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