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feat(packages): ludic.net - a party over UDP: peers, reliable ordered delivery, the hello's frame and the host's pids, join codes, room codes through a matchmaker with STUN, punching and a relay, the MTU cap and the wire codec; messages in on an inbox, the session's end and a silent guest as facts

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Orkun ÇAKILKAYA 2026-09-25 07:45:26 +03:00
parent 411206e45a
commit 12172d7b75
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packages/ludic.net/stun.ludic Normal file
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# stun.ludic - from the party's own socket, ask a public STUN server what this machine looks like
# from outside: the router's address and the port it mapped
var net__stun_ip: int = 0
var net__stun_port: int = 0
var net__txn: words = null
var net__dice: Rng = null
function net__stun_send() -> void {
if net__txn == null { net__txn = words(3) }
if net__dice == null { net__dice = rng_new(net__conf().seed) }
if net__stun_ip == 0 {
let c = net__conf()
if len(c.stun_at) > 0 and net_parse_code(c.stun_at) {
net__stun_ip = net__code_ip
net__stun_port = net__code_port
} else if len(c.stun_host) > 0 {
let host: pointer = c.stun_host
net__stun_ip = Udp.resolve(host)
net__stun_port = c.stun_port
}
if net__stun_ip == 0 { return }
}
let b = buffer(20)
nb_put8(b, 0, 0) # a binding request, no attributes
nb_put8(b, 1, 1)
nb_put8(b, 2, 0)
nb_put8(b, 3, 0)
nb_put8(b, 4, 0x21) # the magic cookie
nb_put8(b, 5, 0x12)
nb_put8(b, 6, 0xA4)
nb_put8(b, 7, 0x42)
for k in 0 .. 3 { net__txn[k] = rng_between(net__dice, 0, 2000000000) }
for k in 0 .. 12 { nb_put8(b, 8 + k, (net__txn[k / 4] >> ((k % 4) * 8)) & 255) }
NetSocket.send(net__sock, net__stun_ip, net__stun_port, b, 20)
}
function net__be16(p: []byte, o: int) -> int { return (nb_get8(p, o) << 8) | nb_get8(p, o + 1) }
function net__be32(p: []byte, o: int) -> int { return (net__be16(p, o) << 16) | net__be16(p, o + 2) }
# a STUN reply: true when it was one (whatever it said)
function net__stun_packet(n: int) -> bool {
if n < 20 or nb_get8(net__in, 0) != 1 or nb_get8(net__in, 1) != 1 { return false }
if net__be32(net__in, 4) != 0x2112A442 { return false }
let len = net__be16(net__in, 2)
var o = 20
while o + 4 <= 20 + len and o + 4 <= n {
let t = net__be16(net__in, o)
let l = net__be16(net__in, o + 2)
if (t == 0x0020 or t == 0x0001) and l >= 8 and o + 12 <= n and nb_get8(net__in, o + 5) == 1 {
var port = net__be16(net__in, o + 6)
var ip = net__be32(net__in, o + 8)
if t == 0x0020 {
port = port ^ 0x2112
ip = ip ^ 0x2112A442
}
net__pub_ip = ip
net__pub_port = port
net__log(`outside we are {net__addr_text(ip, port)}`)
}
o += 4 + ((l + 3) / 4) * 4
}
return true
}
# what this machine looks like from outside, once STUN has said (0 until then)
export function net_outside_ip() -> int { return net__pub_ip }
export function net_outside_port() -> int { return net__pub_port }