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From "Jens Geyer (Jira)" <j...@apache.org>
Subject [jira] [Resolved] (THRIFT-5186) AI_ADDRCONFIG: Thrift libraries crash with localhost-only network.
Date Tue, 09 Jun 2020 21:12:00 GMT

     [ https://issues.apache.org/jira/browse/THRIFT-5186?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jens Geyer resolved THRIFT-5186.
--------------------------------
    Resolution: Fixed

> AI_ADDRCONFIG: Thrift libraries crash with localhost-only network.
> ------------------------------------------------------------------
>
>                 Key: THRIFT-5186
>                 URL: https://issues.apache.org/jira/browse/THRIFT-5186
>             Project: Thrift
>          Issue Type: Bug
>          Components: C++ - Library, Delphi - Library, Python - Library
>    Affects Versions: 0.13.0
>         Environment: Red Hat Enterprise Linux 8.0
>            Reporter: Max
>            Assignee: Max
>            Priority: Major
>              Labels: getaddrinfo, localhost, sockets
>             Fix For: 0.14.0
>
>         Attachments: 0001-THRIFT-5186-Dont-pass-AI_ADDRCONFIG-to-getaddrinfo.patch
>
>          Time Spent: 6h 20m
>  Remaining Estimate: 0h
>
> THRIFT-2539 has been reported, and fixed — but for win32 only, for no apparent reason.
The exact same problem reproduces on POSIX.
> Namely, when no network interfaces besides {{lo}} (the 127.0.0.1 loopback interface)
are up, C++ and Python apps linked with Thrift-generated code, both clients and servers —
*crash by throwing an exception*. Even when the intention is exactly to run them on localhost
only.
> This happens because Thrift library code for TSocket, TServerSocket, TNonblockingServerSocket
calls [{{getaddrinfo()}}|http://man7.org/linux/man-pages/man3/getaddrinfo.3.html] to resolve
target hostname to connect to/listen on, into concrete IP address (v4 or v6, whichever the
system is configured for). To that call, it *passes the {{AI_ADDRCONFIG}} hint* which effectively
turns a localhost-only situation into:
> {quote}{{Could not resolve host for client socket.}}
> {quote}
> and into this (server-side):
> {code:java}
> гру 23 13:52:13 localhost.localdomain systemd[1]: db_cache.service: Main process exited,
code=dumped, status=6/ABRT
> гру 23 13:52:13 localhost.localdomain systemd[1]: db_cache.service: Failed with result
'core-dump'.
> гру 23 13:52:17 localhost.localdomain db_cache[12912]: Thrift: Mon Dec 23 13:52:15
2019 TSocket::open() getaddrinfo() <Host: 127.0.0.1 Port: 1302>Address family for hostname
not supported
> гру 23 13:52:17 localhost.localdomain db_cache[12912]: Thrift: Mon Dec 23 13:52:15
2019 TSocket::open() getaddrinfo() <Host: 127.0.0.1 Port: 8345>Address family for hostname
not supported
> гру 23 13:52:17 localhost.localdomain db_cache[12912]: Thrift: Mon Dec 23 13:52:15
2019 TNonblocking: using dedicated listener thread, io threads: 16
> гру 23 13:52:17 localhost.localdomain db_cache[12912]: Thrift: Mon Dec 23 13:52:15
2019 getaddrinfo -9: Address family for hostname not supported
> гру 23 13:52:17 localhost.localdomain db_cache[12912]: terminate called after throwing
an instance of 'apache::thrift::transport::TTransportException'
> гру 23 13:52:17 localhost.localdomain db_cache[12912]:   what():  Could not resolve
host for server socket.
> {code}
> I fail to understand the original reason to pass that {{AI_ADDRCONFIG}} hint. It shouldn't
be there as I see it.
> Further, since Thrift 0.9.2, windows builds of thrift apps don't pass that hint anymore
(see THRIFT-2539), and it seems to be okay.
> For comprehension, I'm attaching a sample patch to remove {{AI_ADDRCONFIG}} from {{lib/cpp}}
and {{lib/py}}. The main change will be landing via GitHub, per Thrift's contribution process,
so please follow there too.



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