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Send both A and AAAA queries if all probes fail. 

AI_ADDRCONFIG is currently implemented by trying to connect
to well-known addresses in order to see if IPv4 and/or IPv6
connectivity is available.

In some cases (e.g., walled gardens with no global
connectivity) both probes can fail. If this happens,
query for both IPv4 and IPv6 addresses instead of doing
nothing and failing the query.

Bug: 5284168
Change-Id: I4e3a69ea86fb6d839a6bd31236b98da81e5cbf45
This commit is contained in:
Lorenzo Colitti 2011-09-28 19:47:38 -07:00
parent b82532d11a
commit f432de2de7
1 changed files with 7 additions and 0 deletions
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7
libc/netbsd/net/getaddrinfo.c
View File

@ -1911,6 +1911,13 @@ _dns_getaddrinfo(void *rv, void *cb_data, va_list ap)
if (pai->ai_flags & AI_ADDRCONFIG) {
query_ipv6 = _have_ipv6();
query_ipv4 = _have_ipv4();
if (query_ipv6 == 0 && query_ipv4 == 0) {
// Both our IPv4 and IPv6 connectivity probes failed, which indicates
// that we have neither an IPv4 or an IPv6 default route (and thus no
// global IPv4 or IPv6 connectivity). We might be in a walled garden.
// Throw up our arms and ask for both A and AAAA.
query_ipv6 = query_ipv4 = 1;
}
}
if (query_ipv6) {
q.qtype = T_AAAA;