57 lines
2 KiB
Text
57 lines
2 KiB
Text
# punch.ludic - the host sends a few packets to each new guest's outside address, so its router
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# expects the guest, while the guest's hello goes the other way: both routers have seen traffic
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# go out, so the replies come in
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var net__seen: []string = null # guests already punched for
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var net__punch_ip: words = null
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var net__punch_port: words = null
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var net__punch_left: words = null
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var net__punch_t: float = 0.0
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var net__punch_b: []byte = null # the punch itself, "MP" and two zeros, made once
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function net__new_guest(pub: string, local: string) -> void {
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let key = `{pub}|{local}`
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if net__seen == null { net__seen = new []string }
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for i in 0 .. len(net__seen) { if net__seen[i] == key { return } }
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push(net__seen, key)
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net__log(`room {net__room}: a guest at {pub} / {local}`)
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if len(pub) > 0 and net_parse_code(pub) { net__punch_add(net__code_ip, net__code_port) }
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if net_parse_code(local) { net__punch_add(net__code_ip, net__code_port) }
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}
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function net__punch_add(ip: int, port: int) -> void {
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if net__punch_ip == null {
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net__punch_ip = words(16)
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net__punch_port = words(16)
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net__punch_left = words(16)
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for k in 0 .. 16 { net__punch_left[k] = 0 }
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}
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for k in 0 .. 16 {
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if net__punch_left[k] > 0 { continue }
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net__punch_ip[k] = ip
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net__punch_port[k] = port
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net__punch_left[k] = 10
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return
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}
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}
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# twice a second while a guest is new: a packet the guest's side ignores, which is the point
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function net__punch_tick(dt: float) -> void {
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if net__punch_ip == null { return }
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net__punch_t = net__punch_t - dt
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if net__punch_t > 0.0 { return }
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net__punch_t = 0.5
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if net__punch_b == null {
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net__punch_b = buffer(4)
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nb_put8(net__punch_b, 0, 'M')
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nb_put8(net__punch_b, 1, 'P')
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}
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for k in 0 .. 16 {
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if net__punch_left[k] <= 0 { continue }
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NetSocket.send(net__sock, net__punch_ip[k], net__punch_port[k], net__punch_b, 4)
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net__punch_left[k] -= 1
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}
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}
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function net__punch_clear() -> void {
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if net__punch_left != null { for k in 0 .. 16 { net__punch_left[k] = 0 } }
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}
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