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https://issues.apache.org/jira/browse/THRIFT-5880?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
James E. King III updated THRIFT-5880:
--------------------------------------
Description:
{{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.}}
was:
{{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]:}}
{{> 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. }}
{{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.}}
> 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
> Priority: Major
> 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.}}
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