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author | Rich Felker <dalias@aerifal.cx> | 2013-11-30 13:33:29 -0500 |
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committer | Rich Felker <dalias@aerifal.cx> | 2013-11-30 13:33:29 -0500 |
commit | 7603c5f127316e5ee4c5b161d87742d2ac824567 (patch) | |
tree | 517f51c517959d8987fd08e0bc8a1226d5d0fdca /tools/install.sh | |
parent | 8c8cf4bbd269d0535cad48f4088083b5a466803f (diff) | |
download | musl-7603c5f127316e5ee4c5b161d87742d2ac824567.tar.gz musl-7603c5f127316e5ee4c5b161d87742d2ac824567.tar.xz musl-7603c5f127316e5ee4c5b161d87742d2ac824567.zip |
support mix of IPv4 and v6 nameservers in resolv.conf
a v6 socket will only be used if there is at least one v6 nameserver address. if the kernel lacks v6 support, the code will fall back to using a v4 socket and requests to v6 servers will silently fail. when using a v6 socket, v4 addresses are converted to v4-mapped form and setsockopt is used to ensure that the v6 socket can accept both v4 and v6 traffic (this is on-by-default on Linux but the default is configurable in /proc and so it needs to be set explicitly on the socket level). this scheme avoids increasing resource usage during lookups and allows the existing network io loop to be used without modification. previously, nameservers whose address family did not match the address family of the first-listed nameserver were simply ignored. prior to recent __ipparse fixes, they were not ignored but erroneously parsed.
Diffstat (limited to 'tools/install.sh')
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