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netty5/transport-native-epoll
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wangyuwei dbee8c9b89 Avoid letting ipv6 addresses join ipv4 groups (#11015) 
Motivation:

#10995 

when `io.netty.channel.unix.Socket` is ipv6 and join a multicast group with ipv4 address will cause `io.netty.channel.ChannelException: setsockopt() failed: Invalid argument` (at least in `Linux centos.dev 4.18.0-240.10.1.el8_3.x86_64 #1 SMP Mon Jan 18 17:05:51 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux`)


Modification:

check if target group address is ipv6 before call  `io.netty.channel.epoll.LinuxSocket#joinGroup(java.net.InetAddress, java.net.NetworkInterface, java.net.InetAddress)` 

I'm not sure if this modification is currect, but i checked source code of java NIO

```
Java_sun_nio_ch_Net_canJoin6WithIPv4Group0(JNIEnv* env, jclass cl)
{
#if defined(__APPLE__)
    /* IPV6_ADD_MEMBERSHIP can be used to join IPv4 multicast groups */
    return JNI_TRUE;
#else
    /* IPV6_ADD_MEMBERSHIP cannot be used to join IPv4 multicast groups */
    return JNI_FALSE;
#endif
}
```
seems ipv6 address can't join ipv4 group except osx

Result:

test on `Linux 3.10.0-514.el7.x86_64 #1 SMP Tue Nov 22 16:42:41 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux` exception  ` setsockopt() failed: Invalid argument` has fixed

Fixes #10995
2021-02-16 14:22:02 +01:00
..
src Avoid letting ipv6 addresses join ipv4 groups (#11015) 2021-02-16 14:22:02 +01:00
pom.xml Use aarch_64 in a consistent way (#10845) 2020-12-08 14:55:54 +01:00
README.md Change the netty.io homepage scheme(http -> https) (#9344) 2019-07-09 21:10:14 +02:00

README.md

Native transport for Linux

See our wiki page.