I have a python script that receives the packets, but when I try and do the
same in go I get nothing back. Can someone please take a look?
func main() {
//udp := "10.239.59.108:14310"
//"224.0.31.1/24"
//"bond0.181"
c, err := net.ListenPacket("udp4", "10.239.59.108:14310")
if err != nil {
println(err)
}
en0, err := net.InterfaceByName("eno1")
if err != nil {
print(err)
// error handling
}
p := ipv4.NewPacketConn(c)
if err := p.JoinGroup(en0, &net.UDPAddr{IP: net.IPv4(224, 0, 31,
1)}); err != nil {
println(err)
}
b := make([]byte, 1500)
for {
n, cm, src, err := p.ReadFrom(b)
println(n, src)
if err != nil {
print(err)
// error handling
}
if cm.Dst.IsMulticast() {
print(100)
}
}
}
-----------------------------------------------
import sys
import socket
import struct
def help_and_exit(prog):
print('Usage: ' + prog + ' from_nic_by_host_ip mcast_group_ip
mcast_port')
sys.exit(1)
def mc_recv(fromnicip, mcgrpip, mcport):
bufsize = 1024
# This creates a UDP socket
receiver = socket.socket(family=socket.AF_INET, type=socket.SOCK_DGRAM,
\
proto=socket.IPPROTO_UDP, fileno=None)
bindaddr = (mcgrpip, mcport)
receiver.bind(bindaddr)
if fromnicip == '0.0.0.0':
mreq = struct.pack("=4sl", socket.inet_aton(mcgrpip),
socket.INADDR_ANY)
else:
mreq = struct.pack("=4s4s", \
socket.inet_aton(mcgrpip), socket.inet_aton(fromnicip))
receiver.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
# Receive the mssage
for i in range(100):
buf, senderaddr = receiver.recvfrom(1024)
print(i, len(buf))
# Release resources
receiver.close()
return msg
def main(argv):
if len(argv) < 4:
help_and_exit(argv[0])
fromnicip = argv[1]
mcgrpip = argv[2]
mcport = int(argv[3])
msg = mc_recv(fromnicip, mcgrpip, mcport)
print(msg)
if __name__=='__main__':
main(sys.argv)
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