Public bug reported:
getaddrinfo(3) refuses to resolve IPv6 addresses if hint flag
AI_ADDRCONFIG is specified and when there are no IPv6 addresses other
than link-local are configured. Unfortunately that happens even with
AI_NUMERICHOST. This makes it impossible to use nc6 with IPv6 loopback
or link-local addresses on such systems, e.g.
$ nc6 -n fe80::a00:27ff:fefd:3b2a%eth0 12345
nc6: forward host lookup failed for remote endpoint
fe80::a00:27ff:fefd:3b2a%eth0: Address family for hostname not supported
The code to resolve addresses in network.c does
#ifdef HAVE_GETADDRINFO_AI_ADDRCONFIG
hints.ai_flags |= AI_ADDRCONFIG;
#endif
if (ca_is_flag_set(attrs, CA_NUMERIC_MODE))
hints.ai_flags |= AI_NUMERICHOST;
this should be perhaps changed to the (untested):
if (ca_is_flag_set(attrs, CA_NUMERIC_MODE))
hints.ai_flags |= AI_NUMERICHOST;
#ifdef HAVE_GETADDRINFO_AI_ADDRCONFIG
else
hints.ai_flags |= AI_ADDRCONFIG;
#endif
so that AI_ADDRCONFIG is not specified when numeric host address is
used.
** Affects: nc6 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1534215
Title:
link-local IPv6 addresses are rejected
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