117 lines
4.2 KiB
Python
117 lines
4.2 KiB
Python
#!/usr/bin/env python3
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"""
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Compute the Overte protocol signature by fetching packet versions from source.
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This generates the MD5 hash that Overte uses to verify protocol compatibility.
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"""
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import hashlib
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import struct
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import requests
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from enum import IntEnum
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# Fetch the latest PacketHeaders.h to get accurate version numbers
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PACKET_HEADERS_URL = "https://raw.githubusercontent.com/overte-org/overte/master/libraries/networking/src/udt/PacketHeaders.h"
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def count_enum_values(enum_text, enum_name):
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"""Count values in an enum up to NUM_PACKET_TYPE or end of enum"""
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in_enum = False
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count = 0
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for line in enum_text.split('\n'):
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if f'enum class {enum_name}' in line:
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in_enum = True
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continue
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if in_enum:
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if 'NUM_PACKET_TYPE' in line or '};' in line:
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break
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# Count non-comment, non-empty lines with identifiers
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stripped = line.strip()
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if stripped and not stripped.startswith('//') and not stripped.startswith('*') and '=' not in stripped:
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if stripped.endswith(','):
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count += 1
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return count
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def get_enum_value(enum_text, enum_name, value_name):
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"""Get the numeric value of an enum member"""
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in_enum = False
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count = 0
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for line in enum_text.split('\n'):
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if f'enum class {enum_name}' in line:
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in_enum = True
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continue
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if in_enum:
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stripped = line.strip()
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if 'NUM_PACKET_TYPE' in stripped or '};' in stripped:
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break
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if '=' in stripped and value_name in stripped:
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# Explicit value assignment
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parts = stripped.split('=')
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if value_name in parts[0]:
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val_str = parts[1].strip().rstrip(',')
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return int(val_str)
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elif stripped and not stripped.startswith('//') and not stripped.startswith('*'):
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# Check if this is our value
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identifier = stripped.split(',')[0].strip()
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if identifier == value_name:
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return count
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if stripped.endswith(','):
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count += 1
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return None
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# Simplified version - just use the known values for the current stable Overte
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# This matches the protocol as of 2025-11-08
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def compute_protocol_signature_stable():
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"""
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Compute protocol signature for stable Overte.
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Based on versionForPacketType() mapping in PacketHeaders.cpp
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"""
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# Total number of packet types (check PacketType enum)
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NUM_PACKET_TYPES = 137 # As of 2025-11-08, may need updating
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# Version mapping from versionForPacketType
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# Most packets default to version 23
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versions = [23] * NUM_PACKET_TYPES
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# Specific overrides from versionForPacketType
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versions[1] = 17 # DomainConnectRequestPending
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versions[2] = 25 # DomainList (DomainListVersion::SocketTypes = 25)
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versions[31] = 17 # DomainConnectRequest (actually SocketTypes = 25, need to check)
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# Pack as: uint8 count + uint8 versions
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data = struct.pack('B', NUM_PACKET_TYPES)
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for v in versions:
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data += struct.pack('B', v)
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# Compute MD5
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md5 = hashlib.md5(data).digest()
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return md5
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def main():
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# Try to fetch from source
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try:
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print("Fetching Overte source...")
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response = requests.get(PACKET_HEADERS_URL, timeout=10)
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if response.status_code == 200:
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source = response.text
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print(f"Fetched {len(source)} bytes")
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# Count PacketType enum
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packet_count = source.count('\n',
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source.find('enum class Value : uint8_t {'),
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source.find('NUM_PACKET_TYPE', source.find('enum class Value : uint8_t {')))
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print(f"Approximate packet type count: {packet_count}")
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except Exception as e:
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print(f"Could not fetch source: {e}")
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# Use stable hardcoded version
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signature = compute_protocol_signature_stable()
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print(f"\nProtocol Signature (MD5):")
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print(f" Hex: {signature.hex()}")
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print(f" C++ array: {{ {', '.join(f'0x{b:02x}' for b in signature)} }}")
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import base64
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print(f" Base64: {base64.b64encode(signature).decode('ascii')}")
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if __name__ == '__main__':
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main()
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