On Thursday, January 26, 2017 2:07:39 PM CET Nikos Mavrogiannopoulos wrote: > I certainly do. Note that there few failures in the libidn testsuite, > which I have put them in ifdef XXX. These are in tst_idna2.c, and > tst_idna4.c. The tst_idna4.c failure has to do with ascii_to_8z in > libidn2 allowing multiple dots, while the tst_idn2.c failures are > beyond my knowledge.
As you say, libidn/idn does not allow empty labels, e.g. looking up "search..." would result in IDNA_INVALID_LENGTH. Libidn2/idn2 currently does allow empty labels, there is no equivalent to IDNA_INVALID_LENGTH. https://tools.ietf.org/html/rfc1034#section-3.5 defines a label having at least one character ("must start with a letter"). <label> ::= <letter> [ [ <ldh-str> ] <let-dig> ] Some more constraints regarding A/U-labels are described at https://tools.ietf.org/html/rfc5890#section-2.3.2 IMO, libidn2 should check these limits We would need IDN2_LABEL_TOO_SHORT and a few tests. Regards, Tim
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