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import { randomUUIDv7 } from "bun"
if (process.argv.length < 4) {
console.log(`more args.\n${process.argv[0]} <ip> <port>`)
}
const ip = process.argv[2] ?? '0.0.0.0'
const port = Number(process.argv[3])
if (!Number.isInteger(port) || port < 1 || port > 65535) {
console.log("bad port")
process.exit(1)
}
type tcpsocket = {
mode: 'tcp'
socket?: Bun.Socket
}
type udpsocket = {
mode: 'udp'
handler: (buf: Buffer) => void
die: () => void
heartbeat?: Timer
}
type socket = tcpsocket | udpsocket
type connection = {
ip: string
port: number
queue: Buffer[]
remoteId?: string
lastSeen: number
} & socket
const udp = await Bun.udpSocket({
socket: {
data(socket, data, port, ip) {
const id = Object.values(sessions).findIndex(s =>
s.mode === 'udp' &&
s.ip === ip &&
s.port === port
)
if (id === -1) return
// send to handler
if (sessions[id] && sessions[id].mode === 'udp') {
sessions[id].handler(data)
}
},
error(socket, error) {
// dead.
for (const sess of Object.values(sessions).filter(e => e.mode === 'udp')) {
sess.die()
}
}
}
})
const connectionsPerIp = new Map<string, number>()
const sessions: Record<string, connection> = {}
async function establishTCP(ip: string, port: number): Promise<string | false> {
const id = randomUUIDv7()
const conn: connection = {
port,
ip,
mode: 'tcp',
socket: undefined,
queue: [],
lastSeen: Date.now()
}
const sockPromise = Bun.connect({
port,
hostname: ip,
reusePort: true,
tls: false,
socket: {
data(socket, data) { conn.queue.push(data) },
close(socket, error) { delete sessions[id] },
end(socket) { delete sessions[id] },
error(socket, error) { delete sessions[id] }
}
})
const timeoutPromise: Promise<0> = new Promise((r) => setTimeout(() => r(0), 5000))
const sock: Bun.Socket | 0 = await Promise.race([sockPromise, timeoutPromise]).catch(err => {
console.log(err)
return 0
})
if (sock === 0) return false
conn.socket = sock
sessions[id] = conn
return id
}
async function establishUDP(ip: string, port: number): Promise<string> {
const id = randomUUIDv7()
const conn: connection = {
port,
ip,
mode: 'udp',
handler: undefined as any,
die: undefined as any,
heartbeat: undefined,
queue: [],
lastSeen: Date.now()
}
conn.handler = (data) => {
if (!conn.heartbeat) {
const str = data.toString()
const bnI = str.indexOf('\n')
if (str.startsWith('T') && bnI !== -1) {
const tm = Number(str.substring(1, bnI))
if (!isNaN(tm)) {
conn.heartbeat = setInterval(() => {
udp.send('N\n', conn.port, conn.ip)
}, tm * 1000)
}
const temp_len = bnI + 1
if (str.length > temp_len) {
data = Buffer.from(str.substring(temp_len))
} else {
return
}
}
}
conn.queue.push(data)
}
conn.die = () => {
clearInterval(conn.heartbeat)
conn.heartbeat = undefined
}
sessions[id] = conn
udp.send("N\n", port, ip) // handshake
return id
}
const eviction_timeout = 60_000
setInterval(() => {
for (const key of Object.keys(sessions)) {
const sess = sessions[key]!
if (sess.lastSeen > Date.now() - eviction_timeout) continue
// evict
if (sess.mode === 'tcp') sess.socket?.close()
else sess.die()
delete sessions[key]
}
}, eviction_timeout)
Bun.serve({
port,
hostname: ip,
routes: {
'/': new Response('this is a broadlayer server.'),
'/tcp/connect/:ip/:port': async req => {
const port = parseInt(req.params.port)
if (isNaN(port)) return new Response('err_badport')
if (port > 65535 || port < 0) return new Response('err_badport')
const clientIp = req.headers.get('x-forwarded-for')?.split(',')[0]?.trim() || 'unknown'
let count = connectionsPerIp.get(clientIp) || 0
if (count >= 4) {
return new Response('err_toomany', { status: 429 })
}
connectionsPerIp.set(clientIp, count + 1)
const res = await establishTCP(req.params.ip, port)
if (res === false) return new Response('err_timeout')
return new Response('ok_' + res)
},
'/udp/connect/:ip/:port': async req => {
const port = parseInt(req.params.port)
if (isNaN(port)) return new Response('err_badport')
if (port > 65535 || port < 0) return new Response('err_badport')
const clientIp = req.headers.get('x-forwarded-for')?.split(',')[0]?.trim() || 'unknown'
let count = connectionsPerIp.get(clientIp) || 0
if (count >= 4) {
return new Response('err_toomany', { status: 429 })
}
connectionsPerIp.set(clientIp, count + 1)
return new Response('ok_' + await establishUDP(req.params.ip, port))
},
'/poll/:id': async req => { // read and consume queue
const sess = sessions[req.params.id]
if (!sess) return new Response('err_badid')
const resp = JSON.stringify(sess.queue)
sess.queue = []
sess.lastSeen = Date.now()
return new Response(resp)
},
'/peek/:id': async req => { // read queue without consuming
const sess = sessions[req.params.id]
if (!sess) return new Response('err_badid')
const resp = JSON.stringify(sess.queue)
sess.lastSeen = Date.now()
return new Response(resp)
},
'/close/:id': async req => { // closes a connection
const sess = sessions[req.params.id]
if (!sess) return new Response('err_badid')
if (sess.mode === 'tcp') sess.socket?.close()
delete sessions[req.params.id]
const clientIp = req.headers.get('x-forwarded-for')?.split(',')[0]?.trim() || 'unknown'
let count = connectionsPerIp.get(clientIp) || 0
if (count > 0) connectionsPerIp.set(clientIp, count - 1)
if (count <= 1) connectionsPerIp.delete(clientIp)
return new Response('ok')
},
'/send/:id': {
POST: async req => {
const sess = sessions[req.params.id]
if (!sess) return new Response('err_badid')
if (!req.body) return new Response('err_empty')
const buf = await (await req.body.blob())!.arrayBuffer()
if (sess.mode === 'tcp') sess.socket?.write(buf)
else udp.send(buf, sess.port, sess.ip)
return new Response('ok')
}
}
}
})
|
