wip

Cargo.toml

@@ -1,56 +1,2 @@
-[package]
+[workspace]
-name = "protomask"
+members = ["libs/easy-tun"]
-version = "0.2.0"
-authors = ["Evan Pratten <ewpratten@gmail.com>"]
-edition = "2021"
-description = "A user space NAT64 implementation"
-readme = "README.md"
-homepage = "https://github.com/ewpratten/protomask"
-documentation = "https://docs.rs/protomask"
-repository = "https://github.com/ewpratten/protomask"
-license = "GPL-3.0"
-keywords = []
-categories = []
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-[dependencies]
-protomask-tun = { path = "protomask-tun", version = "0.1.0" }
-tokio = { version = "1.29.1", features = [
-    "macros",
-    "rt-multi-thread",
-    # "process",
-    "sync"
-] }
-clap = { version = "4.3.11", features = ["derive"] }
-serde = { version = "1.0.171", features = ["derive"] }
-ipnet = { version = "2.8.0", features = ["serde"] }
-hyper = { version = "0.14.27", features = ["server", "http1", "tcp"] }
-owo-colors = { version = "3.5.0", features = ["supports-colors"] }
-toml = "0.7.6"
-log = "0.4.19"
-fern = "0.6.2"
-serde_path_to_error = "0.1.13"
-thiserror = "1.0.43"
-tun-tap = "0.1.3"
-bimap = "0.6.3"
-pnet_packet = "0.34.0"
-rtnetlink = "0.13.0"
-futures = "0.3.28"
-prometheus = "0.13.3"
-lazy_static = "1.4.0"
-
-[[bin]]
-name = "protomask"
-path = "src/cli/main.rs"
-
-[package.metadata.deb]
-section = "network"
-assets = [
-    ["target/release/protomask", "/usr/local/bin/protomask", "755"],
-    ["./protomask.toml", "/etc/protomask.toml", "644"],
-    ["README.md", "usr/share/doc/protomask/README.md", "644"]
-]
-conf-files = ["/etc/protomask.toml"]
-depends = []
-maintainer-scripts = "./debian/"
-systemd-units = { enable = false }

libs/easy-tun/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "easy-tun"
+version = "0.1.0"
+authors = ["Evan Pratten <ewpratten@gmail.com>"]
+edition = "2021"
+description = "TUN interfaces made easy"
+readme = "README.md"
+homepage = "https://github.com/ewpratten/protomask/libs/easy-tun"
+documentation = "https://docs.rs/easy-tun"
+repository = "https://github.com/ewpratten/protomask"
+license = "GPL-3.0"
+keywords = []
+categories = []
+
+[dependencies]
+tokio = { version = "^1.29.1", features = ["sync", "rt"] }
+log = "^0.4"
+libc = "^0.2"
+ioctl-gen = "^0.1.1"
+rtnetlink = "^0.13.0"

libs/easy-tun/src/lib.rs

@@ -0,0 +1,110 @@
+use std::{
+    fs::{File, OpenOptions},
+    future::Future,
+    mem::size_of,
+    os::fd::{AsRawFd, IntoRawFd, RawFd},
+};
+
+use ioctl_gen::{ioc, iow};
+use libc::{__c_anonymous_ifr_ifru, ifreq, ioctl, IFF_NO_PI, IFF_TUN, IF_NAMESIZE};
+
+/// A TUN device
+pub struct Tun {
+    /// Internal file descriptor for the TUN device
+    fd: File,
+    /// Device name
+    name: String,
+    /// Handle on the RTNETLINK connection
+    rt_connection_future: Box<dyn Future<Output = ()>>,
+    /// Handle on the RTNETLINK socket
+    rt_handle: rtnetlink::Handle,
+    /// Link index of the TUN device
+    link_index: u32,
+}
+
+impl Tun {
+    /// Creates a new Tun device with the given name.
+    ///
+    /// The `name` argument must be less than the system's `IFNAMSIZ` constant,
+    /// and may contain a `%d` format specifier to allow for multiple devices with the same name.
+    pub fn new(dev: &str) -> Result<Self, std::io::Error> {
+        // Get a file descriptor for `/dev/net/tun`
+        log::trace!("Opening /dev/net/tun");
+        let fd = OpenOptions::new()
+            .read(true)
+            .write(true)
+            .open("/dev/net/tun")?;
+
+        // Copy the device name into a C string with padding
+        // NOTE: No zero padding is needed because we pre-init the array to all 0s
+        let mut dev_cstr = [0i8; IF_NAMESIZE];
+        let dev_bytes: Vec<i8> = dev.as_bytes().iter().map(|c| *c as i8).collect();
+        let dev_len = dev_bytes.len().min(IF_NAMESIZE);
+        log::trace!("Device name length after truncation: {}", dev_len);
+        dev_cstr[..dev_len].copy_from_slice(&dev_bytes[..dev_len]);
+
+        // Build an `ifreq` struct to send to the kernel
+        let mut ifr = ifreq {
+            ifr_name: dev_cstr,
+            ifr_ifru: __c_anonymous_ifr_ifru {
+                ifru_flags: (IFF_TUN | IFF_NO_PI) as i16,
+            },
+        };
+
+        // Make an ioctl call to create the TUN device
+        log::trace!("Calling ioctl to create TUN device");
+        let err = unsafe {
+            ioctl(
+                fd.as_raw_fd(),
+                iow!('T', 202, size_of::<usize>()) as u64,
+                &mut ifr,
+            )
+        };
+        log::trace!("ioctl returned: {}", err);
+
+        // Check for errors
+        if err < 0 {
+            log::error!("ioctl failed: {}", err);
+            return Err(std::io::Error::last_os_error());
+        }
+
+        // Get the name of the device
+        let name = unsafe { std::ffi::CStr::from_ptr(ifr.ifr_name.as_ptr()) }
+            .to_str()
+            .unwrap()
+            .to_string();
+
+        // Create an rtnetlink connection
+        let (rt_connection, rt_handle, _) = rtnetlink::new_connection().map_err(|err| {
+            log::error!("Failed to open rtnetlink connection");
+            log::error!("{}", err);
+            err
+        })?;
+
+        // Build the TUN struct
+        Ok(Self {
+            fd,
+            name,
+            rt_connection_future: Box::new(rt_connection),
+            rt_handle,
+            link_index: 0,
+        })
+    }
+
+    /// Get the name of the TUN device
+    pub fn name(&self) -> &str {
+        &self.name
+    }
+}
+
+impl AsRawFd for Tun {
+    fn as_raw_fd(&self) -> RawFd {
+        self.fd.as_raw_fd()
+    }
+}
+
+impl IntoRawFd for Tun {
+    fn into_raw_fd(self) -> RawFd {
+        self.fd.into_raw_fd()
+    }
+}

protomask/Cargo.toml

@@ -0,0 +1,56 @@
+[package]
+name = "protomask"
+version = "0.2.0"
+authors = ["Evan Pratten <ewpratten@gmail.com>"]
+edition = "2021"
+description = "A user space NAT64 implementation"
+readme = "README.md"
+homepage = "https://github.com/ewpratten/protomask"
+documentation = "https://docs.rs/protomask"
+repository = "https://github.com/ewpratten/protomask"
+license = "GPL-3.0"
+keywords = []
+categories = []
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[dependencies]
+protomask-tun = { path = "protomask-tun", version = "0.1.0" }
+tokio = { version = "1.29.1", features = [
+    "macros",
+    "rt-multi-thread",
+    # "process",
+    "sync"
+] }
+clap = { version = "4.3.11", features = ["derive"] }
+serde = { version = "1.0.171", features = ["derive"] }
+ipnet = { version = "2.8.0", features = ["serde"] }
+hyper = { version = "0.14.27", features = ["server", "http1", "tcp"] }
+owo-colors = { version = "3.5.0", features = ["supports-colors"] }
+toml = "0.7.6"
+log = "0.4.19"
+fern = "0.6.2"
+serde_path_to_error = "0.1.13"
+thiserror = "1.0.43"
+tun-tap = "0.1.3"
+bimap = "0.6.3"
+pnet_packet = "0.34.0"
+rtnetlink = "0.13.0"
+futures = "0.3.28"
+prometheus = "0.13.3"
+lazy_static = "1.4.0"
+
+[[bin]]
+name = "protomask"
+path = "src/cli/main.rs"
+
+[package.metadata.deb]
+section = "network"
+assets = [
+    ["target/release/protomask", "/usr/local/bin/protomask", "755"],
+    ["./protomask.toml", "/etc/protomask.toml", "644"],
+    ["README.md", "usr/share/doc/protomask/README.md", "644"]
+]
+conf-files = ["/etc/protomask.toml"]
+depends = []
+maintainer-scripts = "./debian/"
+systemd-units = { enable = false }