Enhance node announcement handling and packet structure. Introduce node-specific metadata in the Reticulum struct, update announce packet creation to support new formats, and improve validation checks for announce data. Adjust minimum packet size requirements and refactor related functions for clarity and consistency.

2025-03-29 18:12:47 -05:00
parent 2f61ce9bf3
commit c8e81cd9f0
4 changed files with 374 additions and 151 deletions
--- a/pkg/announce/announce.go
+++ b/pkg/announce/announce.go
@@ -169,44 +169,108 @@ func (a *Announce) HandleAnnounce(data []byte) error {

 	log.Printf("[DEBUG-7] Handling announce packet of %d bytes", len(data))

-	// Minimum packet size validation (header(2) + desthash(16) + enckey(32) + signkey(32) + namehash(10) +
-	// randomhash(10) + signature(64) + min app data(3))
-	if len(data) < 169 {
-		log.Printf("[DEBUG-7] Invalid announce data length: %d bytes", len(data))
+	// Minimum packet size validation
+	// header(2) + desthash(16) + context(1) + enckey(32) + signkey(32) + namehash(10) +
+	// randomhash(10) + signature(64) + min app data(3)
+	if len(data) < 170 {
+		log.Printf("[DEBUG-7] Invalid announce data length: %d bytes (minimum 170)", len(data))
 		return errors.New("invalid announce data length")
 	}

-	// Parse fields
+	// Extract header and check packet type
 	header := data[:2]
+	if header[0]&0x03 != PACKET_TYPE_ANNOUNCE {
+		return errors.New("not an announce packet")
+	}
+
+	// Get hop count
 	hopCount := header[1]
-	destHash := data[2:18]
-	encKey := data[18:50]
-	signKey := data[50:82]
-	nameHash := data[82:92]
-	randomHash := data[92:102]
-	signature := data[102:166]
-	appData := data[166:]
-
-	log.Printf("[DEBUG-7] Announce fields: destHash=%x, encKey=%x, signKey=%x",
-		destHash, encKey, signKey)
-	log.Printf("[DEBUG-7] Name hash=%x, random hash=%x", nameHash, randomHash)
-
-	// Validate hop count
 	if hopCount > MAX_HOPS {
 		log.Printf("[DEBUG-7] Announce exceeded max hops: %d", hopCount)
 		return errors.New("announce exceeded maximum hop count")
 	}

-	// Create announced identity from public keys
+	// Parse the packet based on header type
+	headerType := (header[0] & 0b01000000) >> 6
+	var contextByte byte
+	var packetData []byte
+
+	if headerType == HEADER_TYPE_2 {
+		// Header type 2 format: header(2) + desthash(16) + transportid(16) + context(1) + data
+		if len(data) < 35 {
+			return errors.New("header type 2 packet too short")
+		}
+		destHash := data[2:18]
+		transportID := data[18:34]
+		contextByte = data[34]
+		packetData = data[35:]
+
+		log.Printf("[DEBUG-7] Header type 2 announce: destHash=%x, transportID=%x, context=%d",
+			destHash, transportID, contextByte)
+	} else {
+		// Header type 1 format: header(2) + desthash(16) + context(1) + data
+		if len(data) < 19 {
+			return errors.New("header type 1 packet too short")
+		}
+		destHash := data[2:18]
+		contextByte = data[18]
+		packetData = data[19:]
+
+		log.Printf("[DEBUG-7] Header type 1 announce: destHash=%x, context=%d",
+			destHash, contextByte)
+	}
+
+	// Now parse the data portion according to the spec
+	// Public Key (32) + Signing Key (32) + Name Hash (10) + Random Hash (10) + [Ratchet] + Signature (64) + App Data
+
+	if len(packetData) < 148 { // 32 + 32 + 10 + 10 + 64
+		return errors.New("announce data too short")
+	}
+
+	// Extract the components
+	encKey := packetData[:32]
+	signKey := packetData[32:64]
+	nameHash := packetData[64:74]
+	randomHash := packetData[74:84]
+
+	// The next field could be a ratchet (32 bytes) or signature (64 bytes)
+	// We need to detect this somehow or use a flag
+	// For now, assume no ratchet
+
+	signature := packetData[84:148]
+	appData := packetData[148:]
+
+	log.Printf("[DEBUG-7] Announce fields: encKey=%x, signKey=%x", encKey, signKey)
+	log.Printf("[DEBUG-7] Name hash=%x, random hash=%x", nameHash, randomHash)
+	log.Printf("[DEBUG-7] Signature=%x, appDataLen=%d", signature[:8], len(appData))
+
+	// Get the destination hash from header
+	var destHash []byte
+	if headerType == HEADER_TYPE_2 {
+		destHash = data[2:18]
+	} else {
+		destHash = data[2:18]
+	}
+
+	// Combine public keys
 	pubKey := append(encKey, signKey...)
+
+	// Create announced identity from public keys
 	announcedIdentity := identity.FromPublicKey(pubKey)
 	if announcedIdentity == nil {
 		return errors.New("invalid identity public key")
 	}

 	// Verify signature
-	signData := append(destHash, appData...)
-	if !announcedIdentity.Verify(signData, signature) {
+	signedData := make([]byte, 0)
+	signedData = append(signedData, destHash...)
+	signedData = append(signedData, encKey...)
+	signedData = append(signedData, signKey...)
+	signedData = append(signedData, nameHash...)
+	signedData = append(signedData, randomHash...)
+	signedData = append(signedData, appData...)
+
+	if !announcedIdentity.Verify(signedData, signature) {
 		return errors.New("invalid announce signature")
 	}

@@ -257,8 +321,8 @@ func (a *Announce) CreatePacket() []byte {
 	// Create header
 	header := CreateHeader(
 		IFAC_NONE,
-		HEADER_TYPE_1,
-		0, // No context flag
+		HEADER_TYPE_2, // Use header type 2 for announces
+		0,             // No context flag
 		PROP_TYPE_BROADCAST,
 		DEST_TYPE_SINGLE,
 		PACKET_TYPE_ANNOUNCE,
@@ -270,38 +334,85 @@ func (a *Announce) CreatePacket() []byte {
 	// Add destination hash (16 bytes)
 	packet = append(packet, a.destinationHash...)

+	// If using header type 2, add transport ID (16 bytes)
+	// For broadcast announces, this is filled with zeroes
+	transportID := make([]byte, 16)
+	packet = append(packet, transportID...)
+
+	// Add context byte
+	packet = append(packet, byte(0)) // Context byte, 0 for announces
+
 	// Add public key parts (32 bytes each)
 	pubKey := a.identity.GetPublicKey()
-	packet = append(packet, pubKey[:32]...) // Encryption key
-	packet = append(packet, pubKey[32:]...) // Signing key
+	encKey := pubKey[:32]  // Encryption key
+	signKey := pubKey[32:] // Signing key
+
+	// Start building data portion according to spec
+	data := make([]byte, 0, 32+32+10+10+32+64+len(a.appData))
+	data = append(data, encKey...)  // Encryption key (32 bytes)
+	data = append(data, signKey...) // Signing key (32 bytes)
+
+	// Determine if this is a node announce based on appData format
+	var appName string
+	if len(a.appData) > 2 && a.appData[0] == 0x93 {
+		// This is a node announcement
+		appName = "reticulum.node"
+	} else if len(a.appData) > 3 && a.appData[0] == 0x92 && a.appData[1] == 0xc4 {
+		nameLen := int(a.appData[2])
+		if 3+nameLen <= len(a.appData) {
+			appName = string(a.appData[3 : 3+nameLen])
+		} else {
+			appName = fmt.Sprintf("%s.%s", a.config.AppName, a.config.AppAspect)
+		}
+	} else {
+		// Default fallback using config values
+		appName = fmt.Sprintf("%s.%s", a.config.AppName, a.config.AppAspect)
+	}

 	// Add name hash (10 bytes)
-	nameHash := sha256.Sum256([]byte(fmt.Sprintf("%s.%s", a.config.AppName, a.config.AppAspect)))
-	packet = append(packet, nameHash[:10]...)
+	nameHash := sha256.Sum256([]byte(appName))
+	nameHash10 := nameHash[:10]
+	log.Printf("[DEBUG-6] Using name hash for '%s': %x", appName, nameHash10)
+	data = append(data, nameHash10...)

-	// Add random hash (10 bytes)
-	randomBytes := make([]byte, 10)
-	rand.Read(randomBytes)
-	packet = append(packet, randomBytes...)
+	// Add random hash (10 bytes) - 5 bytes random + 5 bytes time
+	randomHash := make([]byte, 10)
+	rand.Read(randomHash[:5])
+	timeBytes := make([]byte, 8)
+	binary.BigEndian.PutUint64(timeBytes, uint64(time.Now().Unix()))
+	copy(randomHash[5:], timeBytes[:5])
+	data = append(data, randomHash...)
+
+	// Add ratchet ID (32 bytes) - required in the packet format
+	if a.ratchetID != nil {
+		data = append(data, a.ratchetID...)
+	} else {
+		// If there's no ratchet, add 32 zero bytes as placeholder
+		data = append(data, make([]byte, 32)...)
+	}

 	// Create validation data for signature
+	// Signature consists of destination hash, public keys, name hash, random hash, and app data
 	validationData := make([]byte, 0)
 	validationData = append(validationData, a.destinationHash...)
-	validationData = append(validationData, pubKey[:32]...) // Encryption key
-	validationData = append(validationData, pubKey[32:]...) // Signing key
-	validationData = append(validationData, nameHash[:10]...)
-	validationData = append(validationData, randomBytes...)
+	validationData = append(validationData, encKey...)
+	validationData = append(validationData, signKey...)
+	validationData = append(validationData, nameHash10...)
+	validationData = append(validationData, randomHash...)
 	validationData = append(validationData, a.appData...)

 	// Add signature (64 bytes)
 	signature := a.identity.Sign(validationData)
-	packet = append(packet, signature...)
+	data = append(data, signature...)

 	// Add app data
 	if len(a.appData) > 0 {
-		packet = append(packet, a.appData...)
+		data = append(data, a.appData...)
 	}

+	// Combine header and data
+	packet = append(packet, data...)
+
 	return packet
 }

@@ -398,36 +509,8 @@ func (a *Announce) GetPacket() []byte {
 	defer a.mutex.Unlock()

 	if a.packet == nil {
-		// Generate hash from announce data
-		h := sha256.New()
-		h.Write(a.destinationHash)
-		h.Write(a.identity.GetPublicKey())
-		h.Write([]byte{a.hops})
-		h.Write(a.appData)
-		if a.ratchetID != nil {
-			h.Write(a.ratchetID)
-		}
-
-		// Construct packet
-		packet := make([]byte, 0)
-		packet = append(packet, PACKET_TYPE_ANNOUNCE)
-		packet = append(packet, a.destinationHash...)
-		packet = append(packet, a.identity.GetPublicKey()...)
-		packet = append(packet, a.hops)
-		packet = append(packet, a.appData...)
-		if a.ratchetID != nil {
-			packet = append(packet, a.ratchetID...)
-		}
-
-		// Add signature
-		signData := append(a.destinationHash, a.appData...)
-		if a.ratchetID != nil {
-			signData = append(signData, a.ratchetID...)
-		}
-		signature := a.identity.Sign(signData)
-		packet = append(packet, signature...)
-
-		a.packet = packet
+		// Use CreatePacket to generate the packet
+		a.packet = a.CreatePacket()
 	}

 	return a.packet