Messages in this thread | | | From | Paul Flinders <> | Date | 03 Nov 2000 18:11:15 +0000 |
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Rob Landley <telomerase@yahoo.com> writes: > 3) Java sucks in many ways. Today's way is that it > never occurred to Sun that a machine might have more > than one IP address assigned to it, so > InetAddress.getLocalHost() returns exactly one > address. Unfortunately, just about EVERY machine has > two interfaces defined, the other one being loopback > on 127.0.0.1, and natrually the loopback is the one > that getLocalHost() returns. (Since it's the one that > we pretty much already know the address of anyway, and > querying it is therefore useless, that's the one it > queries. Thank you Sun.) There is no way to query > the current machine's interfaces without resorting to > native code.
I faced this problem a while ago - in the end I cheated and put this bit of code in a shell script used to start the application
NET_ADDRESSES=`/sbin/ifconfig | \ awk '/^[^ ].*HWaddr/ { HWaddr=$5; next;} /^[^ ]/ { HWaddr=0; } /^[ ].*addr:/ { if (HWaddr != 0) { printf("-Dethaddr.%s=%s -Dnetmask.%s=%s ",substr($2,6),HWaddr,substr($2,6),substr($4,6)); } } END {print;}'`
including ${NET_ADDRESSES} in the java command line sets up a set of defines, one per interface. For example
-Dethaddr.172.16.1.1=00:00:0A:BC:CD:78 -Dnetmask.172.16.1.1=255.255.0.0
which you can use via System.getProperty() and System.getProperties()
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