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https://issues.apache.org/jira/browse/THRIFT-5880?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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James E. King III updated THRIFT-5880:
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Fix Version/s: 0.23.0
> C++ TSocket on an IPv6-only system fails if you use a hostname of 127.0.0.1
> ---------------------------------------------------------------------------
>
> Key: THRIFT-5880
> URL: https://issues.apache.org/jira/browse/THRIFT-5880
> Project: Thrift
> Issue Type: Bug
> Components: C++ - Library
> Affects Versions: 0.20.0
> Reporter: James E. King III
> Assignee: James E. King III
> Priority: Minor
> Fix For: 0.23.0
>
> Attachments: resolvtest.c
>
>
> {{The TSocket code uses AI_ADDRCONFIG to resolve the hostname and retrieve A
> and AAAA records for IPv6 compatibility. There's a nasty corner case
> documented in the [getaddrinfo()
> documentation|https://linux.die.net/man/3/getaddrinfo]:}}
> {quote}{{If _hints.ai_flags_ includes the *AI_ADDRCONFIG* flag, then IPv4
> addresses are returned in the list pointed to by _res_ only if the local
> system has at least one IPv4 address configured, and IPv6 addresses are only
> returned if the local system has at least one IPv6 address configured. The
> loopback address is not considered for this case as valid as a configured
> address. }}
> {quote}
> {{Therefore on a system that has only IPv6 interfaces with the exception of
> loopback, using AI_ADDRINFO results in an EAI_ADDRFAMILY error:}}
> {{# ifconfig}}
> {{eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500}}
> {{ inet6 ffff:ffff:ffff:ffff::ffff prefixlen 128 scopeid
> 0x0<global>}}
> {{ inet6 ffff::ffff:ff:ffff:ffff prefixlen 64 scopeid 0x20<link>}}
> {{ ether ff:ff:ff:ff:ff:ff txqueuelen 10000 (Ethernet)}}
> {{ RX packets 118419 bytes 352689119 (336.3 MiB)}}
> {{ RX errors 0 dropped 4 overruns 0 frame 0}}
> {{ TX packets 101312 bytes 43358432 (41.3 MiB)}}
> {{ TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0}}
> {{lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536}}
> {{ inet 127.0.0.1 netmask 255.0.0.0}}
> {{ inet6 ::1 prefixlen 128 scopeid 0x10<host>}}
> {{ loop txqueuelen 1000 (Local Loopback)}}
> {{ RX packets 2343 bytes 277200 (270.7 KiB)}}
> {{ RX errors 0 dropped 0 overruns 0 frame 0}}
> {{ TX packets 2343 bytes 277200 (270.7 KiB)}}
> {{ TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0}}
> Calling getaddrinfo() on "127.0.0.1" causes this error. I generated a test
> program to validate the behavior:
> {{# ## without AI_ADDRCONFIG - it works}}
> {{# ./resolvtest 127.0.0.1}}
> {{Resolving hostname: 127.0.0.1}}
> {{Resolution successful. Results:}}
> {{ 1: IPv4: 127.0.0.1}}
> {{ Family: 2, Socket type: 1, Protocol: 6}}
> {{# ./resolvtest -c 127.0.0.1}}
> {{Using AI_ADDRCONFIG flag}}
> {{Resolving hostname: 127.0.0.1}}
> {{getaddrinfo error: Address family for hostname not supported}}
> {{I attached the test program as well.}}
> {{The fix is simple: in TSocket.cpp around line 466 where we check for an
> EAI_NODATA response, we should also check for EAI_ADDRFAMILY.}}
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