From 518e4dd38939e602cbfd19379d64b901cbcb96ce Mon Sep 17 00:00:00 2001 From: Thomas Karpiniec Date: Fri, 28 Jun 2024 11:54:35 +1000 Subject: [PATCH 1/1] Add top-level docs and update README --- README.md | 56 ++++++++++++++++++++++++++++++++++++++++++++++- examples/watch.rs | 4 ++-- src/lib.rs | 42 +++++++++++++++++++++++++++++++++++ 3 files changed, 99 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 93686b8..5390469 100644 --- a/README.md +++ b/README.md @@ -1,2 +1,56 @@ # netwatcher -Query network interfaces and watch for changes in Rust + +![Crates.io Version](https://img.shields.io/crates/v/netwatcher) +![docs.rs](https://img.shields.io/docsrs/netwatcher) + +`netwatcher` is a cross-platform Rust library for enumerating network interfaces and their IP addresses, featuring the ability to watch for changes to those interfaces _efficiently_. It uses platform-specific methods to detect when interface changes have occurred instead of polling, which means that you find out about changes more quickly and there is no CPU or wakeup overhead when nothing is happening. + +## Current platform suport + +| Platform | Min Version | List | Watch | Notes | +|----------|-------------|------|-------|---------------------------------------------------------------------------------------| +| Windows | - | ✅ | ✅ | | +| Mac | 10.14 | ✅ | ✅ | | +| Linux | - | ✅ | ✅ | Creates a background thread | +| iOS | 12.0 | ✅ | ✅ | | +| Android | - | ✅ | ❌ | Linux-style watch fails on Android 11+ due to privacy restrictions. Alternatives WIP. | + +## Usage + +### Listing interfaces + +```rust +/// Returns a HashMap from ifindex (a `u32`) to an `Interface` struct +let interfaces = netwatcher::list_interfaces().unwrap(); +for i in interfaces.values() { + println!("interface {} has {} IPs", i.name, i.ips.len()); +} +``` + +### Watching for changes to interfaces + +```rust +let handle = netwatcher::watch_interfaces(|update| { + // This callback will fire once immediately with the existing state + + // Update includes the latest snapshot of all interfaces + println!("Current interface map: {:#?}", update.interfaces); + + // The `UpdateDiff` describes changes since previous callback + // You can choose whether to use the snapshot, diff, or both + println!("ifindexes added: {:?}", update.diff.added); + println!("ifindexes removed: {:?}", update.diff.removed); + for (ifindex, if_diff) in update.diff.modified { + println!("Interface index {} has changed", ifindex); + println!("Added IPs: {:?}", if_diff.addrs_added); + println!("Removed IPs: {:?}", if_diff.addrs_removed); + } +}); +// keep `handle` alive as long as you want callbacks +// ... +drop(handle); +``` + +## Licence + +Apache License Version 2.0 - see `LICENSE`. \ No newline at end of file diff --git a/examples/watch.rs b/examples/watch.rs index 2f9539c..767fd19 100644 --- a/examples/watch.rs +++ b/examples/watch.rs @@ -5,8 +5,8 @@ fn main() { let handle = netwatcher::watch_interfaces(|update| { println!("Interface update!"); - println!("State: {:?}", update.interfaces); - println!("Diff: {:?}", update.diff); + println!("State: {:#?}", update.interfaces); + println!("Diff: {:#?}", update.diff); }); std::thread::sleep(Duration::from_secs(30)); diff --git a/src/lib.rs b/src/lib.rs index 495b9e6..dfc4395 100644 --- a/src/lib.rs +++ b/src/lib.rs @@ -1,3 +1,45 @@ +//! # netwatcher +//! +//! `netwatcher` is a cross-platform library for enumerating network interfaces and their +//! IP addresses, featuring the ability to watch for changes to those interfaces +//! _efficiently_. It uses platform-specific methods to detect when interface changes +//! have occurred instead of polling, which means that you find out about changes more +//! quickly and there is no CPU or wakeup overhead when nothing is happening. +//! +//! ## List example +//! +//! ``` +//! /// Returns a HashMap from ifindex (a `u32`) to an `Interface` struct +//! let interfaces = netwatcher::list_interfaces().unwrap(); +//! for i in interfaces.values() { +//! println!("interface {} has {} IPs", i.name, i.ips.len()); +//! } +//! ``` +//! +//! ## Watch example +//! +//! ``` +//! let handle = netwatcher::watch_interfaces(|update| { +//! // This callback will fire once immediately with the existing state +//! +//! // Update includes the latest snapshot of all interfaces +//! println!("Current interface map: {:#?}", update.interfaces); +//! +//! // The `UpdateDiff` describes changes since previous callback +//! // You can choose whether to use the snapshot, diff, or both +//! println!("ifindexes added: {:?}", update.diff.added); +//! println!("ifindexes removed: {:?}", update.diff.removed); +//! for (ifindex, if_diff) in update.diff.modified { +//! println!("Interface index {} has changed", ifindex); +//! println!("Added IPs: {:?}", if_diff.addrs_added); +//! println!("Removed IPs: {:?}", if_diff.addrs_removed); +//! } +//! }); +//! // keep `handle` alive as long as you want callbacks +//! // ... +//! drop(handle); +//! ``` + use std::{ collections::{HashMap, HashSet}, net::{IpAddr, Ipv4Addr, Ipv6Addr}, -- 2.39.5