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cmol@qui-gon:~$ ruby src/multicast.rb | |
Using local interface wlp4s0 with address fe80::71c0:aa40:6d16:7c59%wlp4s0 | |
========= Sending echo REQUEST from fe80::71c0:aa40:6d16:7c59%wlp4s0 | |
[REQUEST] Hello from fe80::ade4:80af:c170:6340%enp0s31f6 | |
========= Sending echo REPLY to fe80::ade4:80af:c170:6340%wlp4s0 | |
[REQUEST] Hello from fe80::a00:27ff:fe07:dea6%enp0s3 | |
========= Sending echo REPLY to fe80::a00:27ff:fe07:dea6%wlp4s0 | |
[REPLY] Hello from fe80::ade4:80af:c170:6340%enp0s31f6 |
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def send_request(socket, linklocal_addr, multicast_addr, multicast_port, | |
flags) | |
puts "========= Sending echo REQUEST from #{linklocal_addr}" | |
socket.send("[REQUEST] Hello from #{linklocal_addr}", | |
flags, multicast_addr, multicast_port) | |
end |
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def create_socket(multicast_addr, multicast_port, ifindex) | |
# Create, bind, and return a UDP multicast socket | |
UDPSocket.new(Socket::AF_INET6).tap do | s | | |
ip = IPAddr.new(multicast_addr).hton + [ifindex].pack('I') | |
s.setsockopt(Socket::IPPROTO_IPV6, Socket::IPV6_JOIN_GROUP, ip) | |
s.setsockopt(Socket::IPPROTO_IPV6, Socket::IPV6_MULTICAST_HOPS, [1].pack('I')) | |
s.setsockopt(Socket::IPPROTO_IPV6, Socket::IPV6_MULTICAST_IF, [ifindex].pack('I')) | |
s.bind("::", multicast_port) | |
end | |
end |
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cmol@second-host:~$ ruby src/multicast.rb | |
Using local interface enp0s31f6 with address fe80::ade4:80af:c170:6340%enp0s31f6 | |
[REPLY] Hello from fe80::71c0:aa40:6d16:7c59%wlp4s0 |
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cmol@qui-gon:~$ ruby src/multicast.rb | |
Using local interface wlp4s0 with address fe80::71c0:aa40:6d16:7c59%wlp4s0 | |
========= Sending echo REQUEST from fe80::71c0:aa40:6d16:7c59%wlp4s0 |
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cmol@third-host:~$ ruby src/multicast.rb | |
Using local interface enp0s3 with address fe80::a00:27ff:fe07:dea6%enp0s3 | |
========= Sending echo REQUEST from fe80::a00:27ff:fe07:dea6%enp0s3 | |
[REPLY] Hello from fe80::71c0:aa40:6d16:7c59%wlp4s0 | |
[REPLY] Hello from fe80::ade4:80af:c170:6340%enp0s31f6 |
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require 'socket' | |
require 'ipaddr' | |
def get_interface_info(name) | |
ifaddrs = Socket.getifaddrs.reject do |ifaddr| | |
!ifaddr.addr&.ipv6_linklocal? || (ifaddr.flags & Socket::IFF_MULTICAST == 0) | |
end | |
ifaddrs.select! {|ifaddr| ifaddr.name == name } if name | |
ifaddrs.map {|ifaddr| [ifaddr.name, ifaddr.ifindex, ifaddr.addr.ip_address] } | |
end |
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[["if_name", index, "ip_address"],[...]] |
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def echo_listener(socket, linklocal_addr, multicast_addr, multicast_port, | |
flags, msg_length) | |
loop do | |
# Listen for messages of up to specified length | |
message, client = socket.recvfrom(msg_length) | |
# Extract client information given as array and log connection | |
addr_info = Addrinfo.new(client) | |
# We are not interested in messages from our selves |
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def get_interface_info(name) | |
ifaddrs = Socket.getifaddrs.reject do |ifaddr| | |
!ifaddr.addr&.ipv6_linklocal? || (ifaddr.flags & Socket::IFF_MULTICAST == 0) | |
end | |
ifaddrs.select! {|ifaddr| ifaddr.name == name } if name | |
ifaddrs.map {|ifaddr| [ifaddr.name, ifaddr.ifindex, ifaddr.addr.ip_address] } | |
end |
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