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More lenient IDNA processing in dig

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If there are any problems with IDN processing, DiG will now quietly
handle the name as if IDN were disabled. This means that international
query names are rendered verbatim on the wire, and ACE names are
printed raw without conversion to UTF8.

If you want to check the syntax of international domain names,
use the `idn2` utility.
This commit is contained in:
Tony Finch
2022-09-05 15:49:49 +01:00
parent 8b9dba53dd
commit f820ef49bf
5 changed files with 141 additions and 288 deletions
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35
doc/man/dig.1in
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@@ -502,29 +502,19 @@ address and port number of the server that provided the answer.
.UNINDENT
.INDENT 0.0
.TP
.B +idnin, +noidnin
This option processes [or does not process] IDN domain names on input. This requires
\fBIDN SUPPORT\fP to have been enabled at compile time.
.B +idn, +noidn
Enable or disable IDN processing. By default IDN is enabled for
input query names, and for display when the output is a terminal.
.sp
The default is to process IDN input when standard output is a tty.
The IDN processing on input is disabled when \fBdig\fP output is redirected
to files, pipes, and other non\-tty file descriptors.
.UNINDENT
.INDENT 0.0
.TP
.B +idnout, +noidnout
This option converts [or does not convert] puny code on output. This requires
\fBIDN SUPPORT\fP to have been enabled at compile time.
.sp
The default is to process puny code on output when standard output is
a tty. The puny code processing on output is disabled when \fBdig\fP output
is redirected to files, pipes, and other non\-tty file descriptors.
You can also turn off \fBdig\fP\(aqs IDN processing by setting
the \fBIDN_DISABLE\fP environment variable.
.UNINDENT
.INDENT 0.0
.TP
.B +ignore, +noignore
This option ignores [or does not ignore] truncation in UDP responses instead of retrying with TCP. By
default, TCP retries are performed.
This option ignores [or does not ignore] truncation in UDP
responses instead of retrying with TCP. By default, TCP retries are
performed.
.UNINDENT
.INDENT 0.0
.TP
@@ -867,15 +857,6 @@ and a query for the NS records of \fBisc.org\fP\&. A global query option of
each lookup. The final query has a local query option of \fI\%+qr\fP which
means that \fBdig\fP does not print the initial query when it looks up the
NS records for \fBisc.org\fP\&.
.SH IDN SUPPORT
.sp
If \fBdig\fP has been built with IDN (internationalized domain name)
support, it can accept and display non\-ASCII domain names. \fBdig\fP
appropriately converts character encoding of a domain name before sending
a request to a DNS server or displaying a reply from the server.
To turn off IDN support, use the parameters
\fI\%+idnin\fP and \fI\%+idnout\fP, or define the \fBIDN_DISABLE\fP environment
variable.
.SH RETURN CODES
.sp
\fBdig\fP return codes are: