Date: Tue, 28 May 2013 14:01:24 +0200 From: Matthias Apitz <guru@unixarea.de> To: freebsd-java@freebsd.org Subject: java && IPv6 Message-ID: <20130528120123.GA1687@tiny.Sisis.de>
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Hello, I'm a C-programmer and want to do something in Java now; I want to write an IPv6 server in java which should do what my C written IPv6-server does: - create the two sockets for IPv4 and IPv6 - bind, listen - monitor the sockets with "poll" and accept the connection on the socket which is ready to be accepted; see the C-source at http://www.unixarea.de/ipv6-server.c.txt it can be compiled and run and creates LISTEN on the two sockets, see netstat output: ~/c]$ gcc ipv6-server.c ~/c]$ ./a.out family: 28 (PF_INET6) sin6_addr: [::] LISTEN: IPv6 ... family: 2 (PF_INET) sin_addr: [0.0.0.0] LISTEN: IPv4 ... ~/c]$ netstat -an | fgrep 39999 tcp4 0 0 *.39999 *.* LISTEN tcp6 0 0 *.39999 *.* LISTEN when I do something similar on the same FreeBSD host in Java, I can't manage to create the IPv6 LISTEN on the IP addr "::"; IPv4 works fine, when I use as addr 'null'; the source is here: http://www.unixarea.de/ipv6.java.txt ~/java]$ javac ipv6.java ~/java]$ java -version java version "1.6.0_03-p4" Java(TM) SE Runtime Environment (build 1.6.0_03-p4-guru_22_apr_2011_14_10-b00) Java HotSpot(TM) Client VM (build 1.6.0_03-p4-guru_22_apr_2011_14_10-b00, mixed mode) ~/java]$ java -Djava.net.preferIPv6Stack=true ipv6 java.net.SocketException: Protocol family unavailable at java.net.PlainSocketImpl.socketBind(Native Method) at java.net.PlainSocketImpl.bind(PlainSocketImpl.java:359) at java.net.ServerSocket.bind(ServerSocket.java:319) at java.net.ServerSocket.<init>(ServerSocket.java:185) at ipv6$1.run(ipv6.java:18) at java.lang.Thread.run(Thread.java:619) Any Java guru out here? Any comments on my Java class? Thanks matthias -- Sent from my FreeBSD netbook Matthias Apitz | - No system with backdoors like Apple/Android E-mail: guru@unixarea.de | - Never being an iSlave WWW: http://www.unixarea.de/ | - No proprietary attachments, no HTML/RTF in E-mail phone: +49-170-4527211 | - Respect for open standards
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