Date: Mon, 09 Jun 2014 09:17:38 +0000 From: bz-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 190824] New: [patch] [libc] getaddrinfo: addrconfig doesn't ignore loopback addresses Message-ID: <bug-190824-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=190824 Bug ID: 190824 Summary: [patch] [libc] getaddrinfo: addrconfig doesn't ignore loopback addresses Product: Base System Version: 11.0-CURRENT Hardware: Any OS: Any Status: Needs Triage Severity: Affects Many People Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: justin.mcomie@gmail.com The AI_ADDRCONFIG option of getaddrinfo is intended to reduce latency by excluding queries for address families not configured on the system. However loopback addresses are currently treated as "configured" addresses, effectively breaking this functionality. This patch addresses this by retooling addrconfig() to exclude addresses on loopback interfaces when looking for configured addresses. The code is based on getifaddrs.c. - This patch does not address link-local addresses with respect to AI_ADDRCONFIG. - This patch does not affect the ability to resolve numeric hosts such as '127.0.0.1', '::1', and 'ffff::%eth0', since getaddrinfo bypasses the call to addrconfig when such an address is requested. Testing: - Host info: $ ifconfig em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM> ether 00:0c:29:0d:a3:78 inet 172.16.69.133 netmask 0xffffff00 broadcast 172.16.69.255 nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> media: Ethernet autoselect (1000baseT <full-duplex>) status: active lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384 options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6> inet6 ::1 prefixlen 128 inet6 fe80::1%lo0 prefixlen 64 scopeid 0x2 inet 127.0.0.1 netmask 0xff000000 nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> - Using a test program like http://www.logix.cz/michal/devel/various/getaddrinfo.c.xp and filtering to just show the address families: - With AI_ADDRCONFIG NOT set: $ ./gai google.com | egrep -o IPv. | uniq IPv4 IPv6 $ ./gai 127.0.0.1 | egrep -o IPv. | uniq IPv4 $ ./gai fe80::1%lo0 | egrep -o IPv. | uniq IPv6 - With AI_ADDRCONFIG set: $ ./gai google.com | egrep -o IPv. | uniq IPv4 $ ./gai 127.0.0.1 | egrep -o IPv. | uniq IPv4 $ ./gai fe80::1%lo0 | egrep -o IPv. | uniq IPv6 -- You are receiving this mail because: You are the assignee for the bug.help
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