[lwip-devel] [bug #65581] UDP Socket Bind Should Bind To Device

[Matt Grochowalski]

Follow-up Comment #2, bug #65581 (group lwip):

Linux behaves the same way.

Example setup:
Shell:
sudo ip link add veth1 type veth peer name veth2
sudo ip addr add 192.168.7.1/24 dev veth1
sudo ip link set veth1 up
sudo ip link set veth2 up

Start Wireshark capture on interface veth2

Run in Python:
import socket
sock = socket.socket( socket.AF_INET, socket.SOCK_DGRAM )
sock.bind( ( '192.168.7.1', 1234 ) )
sock.sendto( b'1234', ( '224.0.0.1', 1234 ) )

Result:
Send succeeds and packet from 192.168.7.1 to 224.0.0.1 is shown in Wireshark

I see now there is a fairly trivial way to get this working by defining a
LWIP_HOOK_IP4_ROUTE_SRC hook that returns the adapter with IP matching src.
But it would be nice to have an option to make this work like other socket
implementations.


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