//! STUN Coder
//!
//! STUN Coder is a STUN protocol encoder and decoder for Rust.
//! The implementation is done according to [Session Traversal Utilities for NAT (STUN)](https://tools.ietf.org/html/rfc5389).
//! STUN extensions specified by the [Interactive Connectivity Establishment (ICE) protocol](https://tools.ietf.org/html/rfc8445#section-7.1) are also supported.
//!
//! An example of creating and encoding a STUN binding request:
//!```
//! // Create a request message
//! let message = stun_coder::StunMessage::create_request()
//!             .add_attribute(stun_coder::StunAttribute::Software {
//!                 description: String::from("rust-stun-coder"),
//!             })
//!             .add_message_integrity()
//!             .add_fingerprint();
//!
//! // Encode it into bytes
//! let encoded_message = message.encode(Some("TEST_PASS")).unwrap();
//!
//! println!("{:#X?}", encoded_message);
//!
//!```
//!
//! An example that decodes a sample request with Long-Term Authentication
//! ```
//! // Encoded message
//! let msg_bytes: Vec<u8> = vec![
//!     0x01, 0x01, 0x00, 0x48, 0x21, 0x12, 0xa4, 0x42, 0xb7, 0xe7, 0xa7, 0x01, 0xbc, 0x34,
//!     0xd6, 0x86, 0xfa, 0x87, 0xdf, 0xae, 0x80, 0x22, 0x00, 0x0b, 0x74, 0x65, 0x73, 0x74,
//!     0x20, 0x76, 0x65, 0x63, 0x74, 0x6f, 0x72, 0x00, 0x00, 0x20, 0x00, 0x14, 0x00, 0x02,
//!     0xa1, 0x47, 0x01, 0x13, 0xa9, 0xfa, 0xa5, 0xd3, 0xf1, 0x79, 0xbc, 0x25, 0xf4, 0xb5,
//!     0xbe, 0xd2, 0xb9, 0xd9, 0x00, 0x08, 0x00, 0x14, 0xBD, 0x3, 0x6D, 0x6A, 0x33, 0x17,
//!     0x50, 0xDF, 0xE2, 0xED, 0xC5, 0x8E, 0x64, 0x34, 0x55, 0xCF, 0xF5, 0xC8, 0xE2, 0x64,
//!     0x80, 0x28, 0x00, 0x04, 0x4F, 0x26, 0x02, 0x93,
//! ];
//!
//! // Integrity key used for verification
//! let integrity_key = Some("VOkJxbRl1RmTxUk/WvJxBt");
//!
//! // Decode the message
//! let decoded_msg = stun_coder::StunMessage::decode(&msg_bytes, integrity_key).unwrap();
//!
//! println!("{:?}", decoded_msg);
//!```
//!
//!
//! Example function that fetches the server reflexive address of all the local interfaces:
//!
//! ```
//! use std::io::{Error, ErrorKind};
//! use std::net::{SocketAddr, UdpSocket};
//!
//! // Fetches mapped address of a local Socket
//! fn get_mapped_addr(binding_addr: SocketAddr) -> Result<SocketAddr, std::io::Error> {
//!     // Use Google's public STUN server
//!     let stun_server = "stun.l.google.com:19302";
//!
//!     // Create a binding message
//!     let binding_msg = stun_coder::StunMessage::create_request()
//!         .add_attribute(stun_coder::StunAttribute::Software {
//!             description: String::from("rust-stun-coder"),
//!         }) // Add software attribute
//!         .add_message_integrity() // Add message integrity attribute
//!         .add_fingerprint(); // Add fingerprint attribute
//!
//!     let integrity_pass = "STUN_CODER_PASS"; // Integrity password to use
//!
//!     // Encode the binding_msg
//!     let bytes = binding_msg.encode(Some(integrity_pass)).unwrap();
//!
//!     // Open a UDP socket
//!     let udp_socket = UdpSocket::bind(binding_addr)?;
//!
//!     // Connect to the STUN server
//!     udp_socket.connect(stun_server.clone())?;
//!
//!     // Send the binding request message
//!     udp_socket.send(&bytes)?;
//!
//!     // Wait for a response
//!     let mut response_buf = [0; 32];
//!     udp_socket.recv(&mut response_buf)?;
//!
//!     // Decode the response
//!     let stun_response =
//!         stun_coder::StunMessage::decode(&response_buf, Some(integrity_pass)).unwrap();
//!
//!     // Find the XorMappedAddress attribute in the response
//!     // It will contain our reflexive transport address
//!     for attr in stun_response.get_attributes() {
//!         if let stun_coder::StunAttribute::XorMappedAddress { socket_addr } = attr {
//!             return Ok(*socket_addr);
//!         }
//!     }
//!
//!     Err(Error::new(
//!         ErrorKind::InvalidData,
//!         "No XorMappedAddress has been set in response.",
//!     ))
//! }
//!
//! // Fetches server reflexive addresses of local interfaces
//! fn get_mapped_addresses() {
//!     // Gather local interfaces
//!     let local_interfaces = get_if_addrs::get_if_addrs().unwrap();
//!
//!     // Attempt to get a mapped address for each one of them
//!     for interface in local_interfaces.iter() {
//!         // Exclude loopback interfaces
//!         if interface.is_loopback() {
//!             continue;
//!         }
//!
//!         // Form a local socket for the interface on port 2000
//!         let host_addr = interface.ip();
//!         let binding_addr = SocketAddr::new(host_addr, 2000);
//!
//!         match get_mapped_addr(binding_addr) {
//!             Ok(mapped_socket_addr) => {
//!                 println!(
//!                     "Mapped host address {} to remote {}.",
//!                     binding_addr, mapped_socket_addr
//!                 );
//!             }
//!             Err(err) => {
//!                 println!(
//!                     "Failed to map host address {}. Error: {}.",
//!                     binding_addr, err
//!                 );
//!             }
//!         }
//!     }
//! }
//! ```

#![warn(missing_docs)]
#![warn(rustdoc::missing_doc_code_examples)]
#![allow(clippy::module_inception)]

#[macro_use]
extern crate num_derive;

mod attribute;
mod definitions;
mod header;
mod message;
mod utils;

#[cfg(test)]
mod tests;

pub use attribute::{AttributeDecodeError, AttributeEncodeError, StunAttribute};
pub use header::{
    HeaderDecodeError, HeaderEncodeError, StunHeader, StunMessageClass, StunMessageMethod,
};
pub use message::{MessageDecodeError, MessageEncodeError, StunMessage};
pub use utils::{check_for_stun_message_header, generate_transaction_id};