Add IDN support - #986
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rsync can now connect to IDN (internationalized domain name) hosts, and IDN names are recognized in a daemon's hosts allow/deny.
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steadytao
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Jul 7, 2026
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Apologies, I have been attending to some personal matters recently. This needs careful review against IDNA/punycode behaviour and daemon allow/deny matching semantics before merge. I would want tests covering Unicode input, punycode input, mixed-case hostnames, invalid IDNs and allow/deny matching to make sure this does not widen host access unexpectedly.
The IDNA mapping folds some non-ASCII characters onto ASCII ones, so running a whole hosts allow/deny token through idn2_to_ascii_8z() could hand back a pattern the admin never wrote: a "＊" (U+FF0A FULLWIDTH ASTERISK) entry came back as "*" and let every host in. Convert label by label instead, keeping an ASCII label byte for byte and using a converted label only when it comes back as a bare A-label. An ASCII-only config now behaves as it did before there was IDN support, and a token that cannot be converted is left alone and so matches nothing. The client side shares the same helper, and neither side truncates a name at its 1024-byte buffer any more. strlower() folds only ASCII now, since its one caller is the hosts allow/deny list, which can hold UTF-8. Adds testsuite/daemon-access-idn and extends testsuite/idn to cover Unicode, punycode, mixed-case and invalid input on both sides.
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Tests added |
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rsync can now connect to IDN (internationalized domain name) hosts, and IDN names are recognized in a daemon's hosts allow/deny.
Closes #851.