Building proxy server using TFTP protocol

📄 Proxy Server Assignment Requirements (TFTP-over-TCP)

✅ Components

• Client connects to proxy and sends a URL.
• Proxy fetches file/page via HTTP and caches the most recent request.
• Proxy relays file to client.
• Only image files (e.g., .jpg) are required to be supported.

---

⚙️ Protocol Specifications

• Use TCP instead of UDP (not traditional TFTP).
• Extend TFTP (RFC 1350) where possible.
• Use TFTP Option Extension (RFC 2347) if applicable.
• Custom packet headers must be designed.
• Support binary (octet) mode only.

---

🔐 Security and Session

• Begin each session with:
  • Sender ID
  • Random number
• Use both values to derive a shared session key.
• Encrypt data using XOR or a better scheme.

---

📤 Transmission Protocol

• Use TCP-style sliding windows
• Implement TCP-style Retransmission Timeout (RTO) scheme.
• Add command-line option to simulate 1% packet drop.

---

🧪 File Handling and Validation

• Received files should be stored in a temporary directory (e.g., /tmp).
• Validate file content with cmp or byte comparison.

---

📊 Throughput Report

Create a web page showing throughput under:

• At least 2 different host pairs
• Window sizes: 1, 8, 64
• With and without 1% simulated drop