mirror of
https://github.com/markqvist/Reticulum.git
synced 2024-11-07 06:40:15 +00:00
391 lines
12 KiB
Python
Executable File
391 lines
12 KiB
Python
Executable File
import struct
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import math
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import time
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import RNS
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class Packet:
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# Packet types
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DATA = 0x00 # Data packets
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ANNOUNCE = 0x01 # Announces
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LINKREQUEST = 0x02 # Link requests
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PROOF = 0x03 # Proofs
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types = [DATA, ANNOUNCE, LINKREQUEST, PROOF]
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# Header types
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HEADER_1 = 0x00 # Normal header format
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HEADER_2 = 0x01 # Header format used for packets in transport
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HEADER_3 = 0x02 # Reserved
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HEADER_4 = 0x03 # Reserved
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header_types = [HEADER_1, HEADER_2, HEADER_3, HEADER_4]
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# Data packet context types
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NONE = 0x00 # Generic data packet
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RESOURCE = 0x01 # Packet is part of a resource
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RESOURCE_ADV = 0x02 # Packet is a resource advertisement
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RESOURCE_REQ = 0x03 # Packet is a resource part request
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RESOURCE_HMU = 0x04 # Packet is a resource hashmap update
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RESOURCE_PRF = 0x05 # Packet is a resource proof
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RESOURCE_ICL = 0x06 # Packet is a resource initiator cancel message
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RESOURCE_RCL = 0x07 # Packet is a resource receiver cancel message
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CACHE_REQUEST = 0x08 # Packet is a cache request
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REQUEST = 0x09 # Packet is a request
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RESPONSE = 0x0A # Packet is a response to a request
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PATH_RESPONSE = 0x0B # Packet is a response to a path request
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COMMAND = 0x0C # Packet is a command
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COMMAND_STATUS = 0x0D # Packet is a status of an executed command
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KEEPALIVE = 0xFB # Packet is a keepalive packet
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LINKCLOSE = 0xFC # Packet is a link close message
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LINKPROOF = 0xFD # Packet is a link packet proof
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LRRTT = 0xFE # Packet is a link request round-trip time measurement
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LRPROOF = 0xFF # Packet is a link request proof
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# This is used to calculate allowable
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# payload sizes
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HEADER_MAXSIZE = 23
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MDU = RNS.Reticulum.MDU
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# With an MTU of 500, the maximum RSA-encrypted
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# amount of data we can send in a single packet
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# is given by the below calculation; 258 bytes.
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RSA_MDU = math.floor(MDU/RNS.Identity.DECRYPT_CHUNKSIZE)*RNS.Identity.ENCRYPT_CHUNKSIZE
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PLAIN_MDU = MDU
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# TODO: This should be calculated
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# more intelligently
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# Default packet timeout
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TIMEOUT = 60
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def __init__(self, destination, data, packet_type = DATA, context = NONE, transport_type = RNS.Transport.BROADCAST, header_type = HEADER_1, transport_id = None, attached_interface = None):
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if destination != None:
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if transport_type == None:
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transport_type = RNS.Transport.BROADCAST
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self.header_type = header_type
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self.packet_type = packet_type
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self.transport_type = transport_type
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self.context = context
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self.hops = 0;
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self.destination = destination
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self.transport_id = transport_id
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self.data = data
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self.flags = self.getPackedFlags()
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self.raw = None
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self.packed = False
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self.sent = False
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self.receipt = None
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self.fromPacked = False
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else:
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self.raw = data
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self.packed = True
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self.fromPacked = True
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self.MTU = RNS.Reticulum.MTU
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self.sent_at = None
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self.packet_hash = None
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self.attached_interface = attached_interface
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def getPackedFlags(self):
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if self.context == Packet.LRPROOF:
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packed_flags = (self.header_type << 6) | (self.transport_type << 4) | RNS.Destination.LINK | self.packet_type
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else:
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packed_flags = (self.header_type << 6) | (self.transport_type << 4) | (self.destination.type << 2) | self.packet_type
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return packed_flags
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def pack(self):
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self.destination_hash = self.destination.hash
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self.header = b""
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self.header += struct.pack("!B", self.flags)
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self.header += struct.pack("!B", self.hops)
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if self.context == Packet.LRPROOF:
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self.header += self.destination.link_id
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self.ciphertext = self.data
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else:
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if self.header_type == Packet.HEADER_1:
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self.header += self.destination.hash
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if self.packet_type == Packet.ANNOUNCE:
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# Announce packets are not encrypted
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self.ciphertext = self.data
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elif self.packet_type == Packet.PROOF and self.context == Packet.RESOURCE_PRF:
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# Resource proofs are not encrypted
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self.ciphertext = self.data
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elif self.packet_type == Packet.PROOF and self.destination.type == RNS.Destination.LINK:
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# Packet proofs over links are not encrypted
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self.ciphertext = self.data
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elif self.context == Packet.RESOURCE:
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# A resource takes care of symmetric
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# encryption by itself
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self.ciphertext = self.data
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elif self.context == Packet.KEEPALIVE:
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# Keepalive packets contain no actual
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# data
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self.ciphertext = self.data
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else:
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# In all other cases, we encrypt the packet
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# with the destination's public key
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self.ciphertext = self.destination.encrypt(self.data)
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if self.header_type == Packet.HEADER_2:
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if self.transport_id != None:
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self.header += self.transport_id
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self.header += self.destination.hash
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if self.packet_type == Packet.ANNOUNCE:
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# Announce packets are not encrypted
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self.ciphertext = self.data
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else:
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raise IOError("Packet with header type 2 must have a transport ID")
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self.header += bytes([self.context])
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self.raw = self.header + self.ciphertext
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if len(self.raw) > self.MTU:
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raise IOError("Packet size of "+str(len(self.raw))+" exceeds MTU of "+str(self.MTU)+" bytes")
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self.packed = True
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self.updateHash()
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def unpack(self):
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self.flags = self.raw[0]
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self.hops = self.raw[1]
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self.header_type = (self.flags & 0b11000000) >> 6
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self.transport_type = (self.flags & 0b00110000) >> 4
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self.destination_type = (self.flags & 0b00001100) >> 2
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self.packet_type = (self.flags & 0b00000011)
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if self.header_type == Packet.HEADER_2:
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self.transport_id = self.raw[2:12]
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self.destination_hash = self.raw[12:22]
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self.context = ord(self.raw[22:23])
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self.data = self.raw[23:]
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else:
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self.transport_id = None
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self.destination_hash = self.raw[2:12]
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self.context = ord(self.raw[12:13])
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self.data = self.raw[13:]
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self.packed = False
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self.updateHash()
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def send(self):
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if not self.sent:
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if self.destination.type == RNS.Destination.LINK:
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if self.destination.status == RNS.Link.CLOSED:
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raise IOError("Attempt to transmit over a closed link")
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else:
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self.destination.last_outbound = time.time()
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self.destination.tx += 1
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self.destination.txbytes += len(self.data)
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if not self.packed:
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self.pack()
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if RNS.Transport.outbound(self):
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return self.receipt
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else:
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# TODO: Don't raise error here, handle gracefully
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raise IOError("Packet could not be sent! Do you have any outbound interfaces configured?")
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else:
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raise IOError("Packet was already sent")
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def resend(self):
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if self.sent:
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if RNS.Transport.outbound(self):
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return self.receipt
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else:
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# TODO: Don't raise error here, handle gracefully
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raise IOError("Packet could not be sent! Do you have any outbound interfaces configured?")
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else:
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raise IOError("Packet was not sent yet")
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def prove(self, destination=None):
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if self.fromPacked and hasattr(self, "destination") and self.destination:
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if self.destination.identity and self.destination.identity.prv:
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self.destination.identity.prove(self, destination)
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elif self.fromPacked and hasattr(self, "link") and self.link:
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self.link.prove_packet(self)
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else:
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RNS.log("Could not prove packet associated with neither a destination nor a link", RNS.LOG_ERROR)
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# Generates a special destination that allows Reticulum
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# to direct the proof back to the proved packet's sender
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def generateProofDestination(self):
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return ProofDestination(self)
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def validateProofPacket(self, proof_packet):
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return self.receipt.validateProofPacket(proof_packet)
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def validateProof(self, proof):
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return self.receipt.validateProof(proof)
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def updateHash(self):
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self.packet_hash = self.getHash()
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def getHash(self):
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return RNS.Identity.fullHash(self.getHashablePart())
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def getTruncatedHash(self):
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return RNS.Identity.truncatedHash(self.getHashablePart())
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def getHashablePart(self):
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hashable_part = bytes([self.raw[0] & 0b00001111])
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if self.header_type == Packet.HEADER_2:
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hashable_part += self.raw[12:]
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else:
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hashable_part += self.raw[2:]
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return hashable_part
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class ProofDestination:
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def __init__(self, packet):
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self.hash = packet.getHash()[:10];
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self.type = RNS.Destination.SINGLE
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def encrypt(self, plaintext):
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return plaintext
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class PacketReceipt:
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# Receipt status constants
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FAILED = 0x00
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SENT = 0x01
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DELIVERED = 0x02
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EXPL_LENGTH = RNS.Identity.HASHLENGTH//8+RNS.Identity.SIGLENGTH//8
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IMPL_LENGTH = RNS.Identity.SIGLENGTH//8
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# Creates a new packet receipt from a sent packet
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def __init__(self, packet):
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self.hash = packet.getHash()
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self.sent = True
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self.sent_at = time.time()
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self.timeout = Packet.TIMEOUT
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self.proved = False
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self.status = PacketReceipt.SENT
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self.destination = packet.destination
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self.callbacks = PacketReceiptCallbacks()
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self.concluded_at = None
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# Validate a proof packet
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def validateProofPacket(self, proof_packet):
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if hasattr(proof_packet, "link") and proof_packet.link:
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return self.validate_link_proof(proof_packet.data, proof_packet.link)
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else:
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return self.validateProof(proof_packet.data)
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# Validate a raw proof for a link
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def validate_link_proof(self, proof, link):
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# TODO: Hardcoded as explicit proofs for now
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if True or len(proof) == PacketReceipt.EXPL_LENGTH:
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# This is an explicit proof
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proof_hash = proof[:RNS.Identity.HASHLENGTH//8]
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signature = proof[RNS.Identity.HASHLENGTH//8:RNS.Identity.HASHLENGTH//8+RNS.Identity.SIGLENGTH//8]
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if proof_hash == self.hash:
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proof_valid = link.validate(signature, self.hash)
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if proof_valid:
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self.status = PacketReceipt.DELIVERED
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self.proved = True
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self.concluded_at = time.time()
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if self.callbacks.delivery != None:
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self.callbacks.delivery(self)
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return True
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else:
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return False
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else:
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return False
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elif len(proof) == PacketReceipt.IMPL_LENGTH:
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pass
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# TODO: Why is this disabled?
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# signature = proof[:RNS.Identity.SIGLENGTH//8]
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# proof_valid = self.link.validate(signature, self.hash)
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# if proof_valid:
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# self.status = PacketReceipt.DELIVERED
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# self.proved = True
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# self.concluded_at = time.time()
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# if self.callbacks.delivery != None:
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# self.callbacks.delivery(self)
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# RNS.log("valid")
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# return True
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# else:
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# RNS.log("invalid")
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# return False
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else:
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return False
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# Validate a raw proof
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def validateProof(self, proof):
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if len(proof) == PacketReceipt.EXPL_LENGTH:
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# This is an explicit proof
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proof_hash = proof[:RNS.Identity.HASHLENGTH//8]
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signature = proof[RNS.Identity.HASHLENGTH//8:RNS.Identity.HASHLENGTH//8+RNS.Identity.SIGLENGTH//8]
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if proof_hash == self.hash:
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proof_valid = self.destination.identity.validate(signature, self.hash)
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if proof_valid:
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self.status = PacketReceipt.DELIVERED
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self.proved = True
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self.concluded_at = time.time()
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if self.callbacks.delivery != None:
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self.callbacks.delivery(self)
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return True
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else:
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return False
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else:
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return False
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elif len(proof) == PacketReceipt.IMPL_LENGTH:
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# This is an implicit proof
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if self.destination.identity == None:
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return False
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signature = proof[:RNS.Identity.SIGLENGTH//8]
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proof_valid = self.destination.identity.validate(signature, self.hash)
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if proof_valid:
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self.status = PacketReceipt.DELIVERED
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self.proved = True
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self.concluded_at = time.time()
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if self.callbacks.delivery != None:
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self.callbacks.delivery(self)
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return True
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else:
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return False
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else:
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return False
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def rtt(self):
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return self.concluded_at - self.sent_at
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def is_timed_out(self):
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return (self.sent_at+self.timeout < time.time())
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def check_timeout(self):
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if self.is_timed_out():
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self.status = PacketReceipt.FAILED
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self.concluded_at = time.time()
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if self.callbacks.timeout:
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self.callbacks.timeout(self)
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# Set the timeout in seconds
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def set_timeout(self, timeout):
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self.timeout = float(timeout)
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# Set a function that gets called when
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# a successfull delivery has been proved
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def delivery_callback(self, callback):
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self.callbacks.delivery = callback
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# Set a function that gets called if the
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# delivery times out
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def timeout_callback(self, callback):
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self.callbacks.timeout = callback
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class PacketReceiptCallbacks:
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def __init__(self):
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self.delivery = None
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self.timeout = None |