Data transferring between peers on the localhost doesn't work on macOS #59
Description
Hey team, first of all, I want to thank you for adding IPv6 support and other features to the original ENet—nicely done! However, I'm encountering an issue on my Mac
Minimum repro steps:
Server code
#include <iostream>
#define ENET_IMPLEMENTATION
#include <enet.h>
int main(int argc, const char * argv[])
{
if (enet_initialize() != 0)
{
return 1;
}
ENetAddress localAddress;
memset(&localAddress, 0, sizeof(ENetAddress));
enet_address_set_host (&localAddress, "127.0.0.1");
localAddress.port = 1234;
ENetHost* server = enet_host_create (&localAddress, 32, 2, 0, 0);
if (!server)
{
exit (1);
}
while (true)
{
ENetEvent event;
if (enet_host_service (server, &event, 1000) > 0)
{
printf("Got event %d\n", event.type);
}
}
enet_host_destroy(server);
enet_deinitialize();
return 0;
}Client code
#include <iostream>
#define ENET_IMPLEMENTATION
#include <enet.h>
int main(int argc, const char * argv[])
{
if (enet_initialize () != 0)
{
return 1;
}
ENetAddress localAddress;
memset(&localAddress, 0, sizeof(ENetAddress));
enet_address_set_host (&localAddress, "127.0.0.1");
localAddress.port = 8973;
ENetHost* client = enet_host_create (&localAddress, 1, 2, 0, 0);
if (client == NULL)
{
exit (1);
}
ENetAddress remoteAddress = localAddress;
remoteAddress.port = 1234;
ENetPeer* remoteServer = enet_host_connect (client, &remoteAddress, 2, 0);
if (remoteServer == NULL)
{
exit (1);
}
ENetEvent event;
/* Wait up to 5 seconds for the connection attempt to succeed. */
if (enet_host_service (client, & event, 5000) > 0 &&
event.type == ENET_EVENT_TYPE_CONNECT)
{
std::printf("Connection to server is succeeded.\n");
}
else
{
enet_peer_reset (remoteServer);
std::printf("Connection to server is failed. Either the 5 seconds are up or a disconnect event was received.\n");
}
enet_host_destroy(client);
enet_deinitialize();
return 0;
}Client output
Connection to server is failed. Either the 5 seconds are up or a disconnect event was received.
So, as you can see, the client never connects to the server.
Notes:
- It seems like the culprit is
enet_socket_receive- because after receiving the message viarecvmsgthesockaddr_in6 sinactually containssockaddr_in(the fieldsin6_familyis set toAF_INETinstead ofAF_INET6) ¯\_(ツ)_/¯ - Explicitly setting the IPv6
localAddressduring socket creation/binding, like this:
enet_address_set_host (&localAddress, "::ffff:127.0.0.1");doesn't help - Explicitly setting the
localAddressas "any" like this:
localAddress.host = ENET_HOST_ANY;
instead of
enet_address_set_host (&localAddress, "127.0.0.1");doesn't help.
Environment:
- macOS: Sequoia 15.2
- Xcode 16.2
- Apple M1 max