47 lines
1.4 KiB
Python
47 lines
1.4 KiB
Python
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#!/usr/bin/env python3
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"""TCP dport 8001 round trip — connect to a Solana entrypoint (ip_echo path).
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The mangle rule matches -p tcp --dport 8001, so connecting TO port 8001
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on any host triggers SNAT to the relay IP. The entrypoint responds with
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ip_echo (4 bytes: our IP in network order).
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"""
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import socket
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import sys
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PORT = int(sys.argv[1]) if len(sys.argv) > 1 else 8001
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HOST = sys.argv[2] if len(sys.argv) > 2 else "34.83.231.102" # entrypoint.mainnet-beta.solana.com
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# Resolve hostname
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try:
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addr = socket.getaddrinfo(HOST, PORT, socket.AF_INET)[0][4][0]
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except socket.gaierror:
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addr = HOST
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s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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s.settimeout(5)
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try:
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s.connect((addr, PORT))
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print(f"OK TCP handshake to {addr}:{PORT}")
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# ip_echo: peer sends our IP back as 4 bytes
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s.settimeout(2)
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try:
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data = s.recv(64)
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if len(data) >= 4:
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ip = socket.inet_ntoa(data[:4])
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print(f"OK ip_echo says we are {ip}")
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else:
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print(f"OK got {len(data)} bytes: {data.hex()}")
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except socket.timeout:
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print("NOTE: no ip_echo response (handshake succeeded)")
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except socket.timeout:
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print("TIMEOUT")
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sys.exit(1)
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except ConnectionRefusedError:
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print(f"OK connection refused by {addr}:{PORT} (host reachable)")
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except Exception as e:
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print(f"ERROR {e}")
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sys.exit(1)
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finally:
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s.close()
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