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Better way of deducing mcast group bytes.

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This commit is contained in:
Guido van Rossum 1992-09-24 10:33:40 +00:00
parent c8833d4ad3
commit 7814c10233
1 changed files with 7 additions and 8 deletions
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15
Demo/sockets/mcast.py
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@ -6,14 +6,15 @@
# mcast (receivers) # mcast (receivers)
MYPORT = 8123 MYPORT = 8123
MYGROUP_BYTES = 225, 0, 0, 250 MYGROUP = '225.0.0.250'
import sys import sys
import time import time
import struct import struct
import regsub
from socket import * from socket import *
from SOCKET import * from SOCKET import *
from IN import * from IN import * # Local module, SGI specific!!!
sender = sys.argv[1:] sender = sys.argv[1:]
@ -24,10 +25,7 @@ if sender:
s.setsockopt(SOL_SOCKET, SO_BROADCAST, 1) s.setsockopt(SOL_SOCKET, SO_BROADCAST, 1)
mygroup = '<broadcast>' mygroup = '<broadcast>'
else: else:
# Ugly: construct decimal IP address string from MYGROUP_BYTES mygroup = MYGROUP
mygroup = ''
for byte in MYGROUP_BYTES: mygroup = mygroup + '.' + `byte`
mygroup = mygroup[1:]
ttl = struct.pack('b', 1) # Time-to-live ttl = struct.pack('b', 1) # Time-to-live
s.setsockopt(IPPROTO_IP, IP_MULTICAST_TTL, ttl) s.setsockopt(IPPROTO_IP, IP_MULTICAST_TTL, ttl)
while 1: while 1:
@ -42,9 +40,10 @@ else:
# Allow multiple copies of this program on one machine # Allow multiple copies of this program on one machine
s.setsockopt(SOL_SOCKET, SO_REUSEPORT, 1) # (Not strictly needed) s.setsockopt(SOL_SOCKET, SO_REUSEPORT, 1) # (Not strictly needed)
# Ugly: construct binary group address from MYGROUP_BYTES # Ugly: construct binary group address from MYGROUP converted to bytes
bytes = eval(regsub.gsub('\.', ',', MYGROUP))
grpaddr = 0 grpaddr = 0
for byte in MYGROUP_BYTES: grpaddr = (grpaddr << 8) | byte for byte in bytes: grpaddr = (grpaddr << 8) | byte
# Construct struct mreq from grpaddr and ifaddr # Construct struct mreq from grpaddr and ifaddr
ifaddr = INADDR_ANY ifaddr = INADDR_ANY