java - Join multicast group using DatagramChannel without specifying network interface -


when using java's multicast socket can join multicast group without specifying networkinterface using code:

multicastsocket sock = new multicastsocket(port); sock.joingroup(addr);

if want use nio on other hand can do: 

datagramchannel dc = datagramchannel.open(standardprotocolfamily.inet)         .setoption(standardsocketoptions.so_reuseaddr, true)         .bind(new inetsocketaddress(port))         .setoption(standardsocketoptions.ip_multicast_if, ifc);  dc.join(addr, ifc);

where ifc networkinterface interested on. if dont know network interface in advance how can join group multicastsocket?

one solution found using code:

multicastsocket msock = new multicastsocket(); networkinterface ifc = msock.getnetworkinterface(); msock.close(); datagramchannel dc = datagramchannel.open(standardprotocolfamily.inet)         .setoption(standardsocketoptions.so_reuseaddr, true)         .bind(new inetsocketaddress(port))         .setoption(standardsocketoptions.ip_multicast_if, ifc);  dc.join(addr, ifc);

surprisingly code works , performed expected, when looking on networkinterface returned multicastsocket.getnetworkinterface() method saw returned interface named "0.0.0.0" of course not exists. there no way network interface of networkinterface.* factories

is solution reliable? can explain why works , if there better way achieve wants?

i using local address can find lan devices! can try it! e.g networkinterface ifc = networkinterface.getbyinetaddress(inetaddress.getlocalhost());


Comments

Post a Comment

Popular posts from this blog

angularjs - ADAL JS Angular- WebAPI add a new role claim to the token -

i have created angular spa webapi backend using adal js authentication.as there no roles in ad, need manually add role claims in order give users access different api controllers. the roles stored in database. expecting inject claim through call webapi after authentication ad. webapi code might this. identity.addclaim(new claim("role", "user")); var ticket = new authenticationticket(identity, props); var accesstoken = startup.oauthbeareroptions.accesstokenformat.protect(ticket); is possible replace adal idtoken new token? is viable solution or there other better way handle this? as initial token generated azuread, possible edit token add new claim? appreciated. graph api supporting group claims. see here: http://justazure.com/azure-active-directory-part-4-group-claims/ if @ examples on page, users assigned groups , app can check group in claims. in current version of portal, need app manifest , modify it.
Read more

php - CakePHP HttpSockets send array of paramms -

i problem when make request (i can request). $link = 'http://uri/path/?param1=1&sid=2&sid=3&sid=4' $http = $httpsocket = new httpsocket(); $res = $httpsocket->get($link); if check request pr($http); i see : [line] => /url/path/?param1=1&sid%5b0%5d=2&sid%5b1%5d=3&sid%5b2%5d=4 http/1.1 and i'm getting empty response because server doesn't know parameters sid%5b0%5d=2 when try send parameters array : $data = array('param1' => '1', 'sid' => array('2','3', '4')); i see same changes %5b0%5d - additional indexes. how fix it? unfortunately , can not change server side, if send request in browser, i'll normal response in json format. when make request, can parameters this: $param1 = $_get['param1']; $sid= $_get['sid']; tip: use diferente names parameters. have multiples sid. use sid1, sid2, sid3... update: can parameters this:
Read more

node.js - Using Node without global install -

i'm working on few node & electron (atom shell) projects , i'm curious how them work without user having install node globally. i've seen few applications including node directory in project contains node.exe binary. how go setting node project use binary? edit: thought should add, i've searched everywhere answer this, unrelated results.
Read more