Method handleDHCP

src/network.js:692–734

(data)

    }
    
    handleDHCP(data) {
        if (data.length < 240) return; // Minimum DHCP packet size
        
        const op = data[0];
        if (op !== 1) return; // Only handle BOOTREQUEST (1)
        
        const htype = data[1];
        const hlen = data[2];
        const xid = data.readUInt32BE(4); // Transaction ID
        const flags = data.readUInt16BE(10);
        const chaddr = data.subarray(28, 28 + 16); // Client hardware address
        
        // Check magic cookie at offset 236
        const magic = data.readUInt32BE(236);
        if (magic !== DHCP_MAGIC_COOKIE) return;
        
        // Parse options starting at offset 240
        let msgType = 0;
        let requestedIP = null;
        let i = 240;
        while (i < data.length) {
            const opt = data[i];
            if (opt === DHCP_OPT_END) break;
            if (opt === 0) { i++; continue; } // Pad
            
            const len = data[i + 1];
            const optData = data.subarray(i + 2, i + 2 + len);
            
            if (opt === DHCP_OPT_MSG_TYPE && len >= 1) {
                msgType = optData[0];
            } else if (opt === DHCP_OPT_REQUESTED_IP && len >= 4) {
                requestedIP = optData.subarray(0, 4);
            }
            
            i += 2 + len;
        }
        
        if (msgType === DHCP_DISCOVER) {
            this.sendDHCPOffer(xid, chaddr, flags);
        } else if (msgType === DHCP_REQUEST) {
            this.sendDHCPAck(xid, chaddr, flags);
        }
    }
    
    sendDHCPOffer(xid, chaddr, flags) {
        this.sendDHCPReply(DHCP_OFFER, xid, chaddr, flags);