a simple demonstration of calling rust from C with cbindgen

diff --git a/hpsdr_discovery.c b/hpsdr_discovery.c
new file mode 100644 (file)
index 0000000..cd87690
--- /dev/null
+++ b/hpsdr_discovery.c
@@ -0,0 +1,16 @@
+// main.c
+#include "hpsdr_discovery.h"
+#include <stdio.h>
+
+int main() {
+    struct CFfiDiscoveredDevice devices[16];
+    int count = discover_devices_ffi(devices, 16);
+    
+    for (int i = 0; i < count; i++) {
+        printf("Found device: %s\n", devices[i].name);
+    }
+
+    list_interfaces_ffi();
+
+    return 0;
+}

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new file mode 100644 (file)
index 0000000..3840937
--- /dev/null
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+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
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+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "memchr",
+]

diff --git a/rust/Cargo.toml b/rust/Cargo.toml
new file mode 100644 (file)
index 0000000..0958446
--- /dev/null
+++ b/rust/Cargo.toml
@@ -0,0 +1,3 @@
+[workspace]
+resolver = "2"
+members = [ "discovery" ]

diff --git a/rust/discovery/Cargo.toml b/rust/discovery/Cargo.toml
new file mode 100644 (file)
index 0000000..a62ef72
--- /dev/null
+++ b/rust/discovery/Cargo.toml
@@ -0,0 +1,17 @@
+[package]
+name = "hpsdr_discovery"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+name = "hpsdr_discovery"
+crate-type = ["cdylib", "rlib"]
+
+[dependencies]
+tokio = { version = "1.0", features = ["full"] }
+libc = "0.2"
+nix = { version = "0.29.0", features = ["net"] }
+
+[build-dependencies]
+cbindgen = "0.27.0"
+

diff --git a/rust/discovery/build.rs b/rust/discovery/build.rs
new file mode 100644 (file)
index 0000000..0afc1b6
--- /dev/null
+++ b/rust/discovery/build.rs
@@ -0,0 +1,14 @@
+use std::env;
+
+fn main() {
+    let crate_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
+    let mut config: cbindgen::Config = cbindgen::Config::from_file("cbindgen.toml").unwrap();
+    config.language = cbindgen::Language::C;
+
+    cbindgen::Builder::new()
+        .with_crate(crate_dir)
+        .with_config(config)
+        .generate()
+        .expect("unable to generate bindings")
+        .write_to_file("hpsdr_discovery.h");
+}

diff --git a/rust/discovery/cbindgen.toml b/rust/discovery/cbindgen.toml
new file mode 100644 (file)
index 0000000..6c87b68
--- /dev/null
+++ b/rust/discovery/cbindgen.toml
@@ -0,0 +1,8 @@
+language = "C"
+sys_includes = ["netinet/in.h"]
+
+
+# workaround for the bug: https://github.com/mozilla/cbindgen/issues/539
+[export.rename]
+"sockaddr_in" = "struct sockaddr_in"
+

diff --git a/rust/discovery/src/discovery.rs b/rust/discovery/src/discovery.rs
new file mode 100644 (file)
index 0000000..dd319ca
--- /dev/null
+++ b/rust/discovery/src/discovery.rs
@@ -0,0 +1,88 @@
+use std::net::*;
+use tokio::time::Duration;
+use crate::types::*;
+use nix::ifaddrs;
+
+const DISCOVERY_PORT: u16 = 1024;
+
+pub async fn discover_devices() -> Vec<DiscoveredDevice> {
+    let socket = UdpSocket::bind("0.0.0.0:0").expect("Failed to bind socket");
+    socket.set_broadcast(true).expect("Failed to set broadcast");
+    let addrs = ifaddrs::getifaddrs().unwrap();
+    /* TODO */
+
+    let mut discovery_packet = [0u8; 63];
+    discovery_packet[0] = 0xEF;
+    discovery_packet[1] = 0xFE;
+    discovery_packet[2] = 0x02;
+
+    let broadcast_addr = SocketAddr::new(IpAddr::V4(Ipv4Addr::BROADCAST), DISCOVERY_PORT);
+    socket.send_to(&discovery_packet, broadcast_addr).expect("Failed to send discovery packet");
+
+    let mut devices = Vec::new();
+    let mut buf = [0u8; 2048];
+    socket.set_read_timeout(Some(Duration::from_secs(2))).expect("Failed to set timeout");
+
+    while let Ok((len, addr)) = socket.recv_from(&mut buf) {
+        if len >= 3 && buf[0] == 0xEF && buf[1] == 0xFE {
+            if let Some(device) = parse_discovery_response(&buf[..len], addr) {
+                devices.push(device);
+            }
+        }
+    }
+
+    devices
+}
+
+pub fn list_interfaces() {
+    let addrs = ifaddrs::getifaddrs().unwrap();
+    for ifaddr in addrs {
+        match ifaddr.address {
+            Some(iface_address) => {
+                println!("interface: {} address: {}", ifaddr.interface_name, iface_address);
+            },
+            None => {
+                println!("interface {} with unsupported address family",
+                         ifaddr.interface_name);
+            }
+        }
+    }
+}
+
+fn parse_discovery_response(data: &[u8], addr: SocketAddr) -> Option<DiscoveredDevice> {
+    if data.len() < 11 {
+        return None;
+    }
+
+    let device_type = data[10];
+    let (name, freq_min, freq_max) = match device_type {
+        0x00 => ("Metis", 0.0, 61440000.0),
+        0x01 => ("Hermes", 0.0, 61440000.0),
+        0x06 => ("HesmesLite2", 0.0, 30720000.0),
+        // Add other device types
+        _ => ("Unknown", 0.0, 61440000.0),
+    };
+
+    let mut mac_addr = [0u8; 6];
+    mac_addr.copy_from_slice(&data[3..9]);
+
+    Some(DiscoveredDevice {
+        protocol: 1,
+        device: device_type,
+        name: name.to_string(),
+        software_version: data[9],
+        status: data[2] as u32,
+        supported_receivers: 2,
+        frequency_min: freq_min,
+        frequency_max: freq_max,
+        network: NetworkInfo {
+            mac_address: mac_addr,
+            address: addr,
+            interface_address: None,
+            interface_netmask: None,
+            interface_name: String::new(),
+        },
+        use_tcp: false,
+    })
+}
+

diff --git a/rust/discovery/src/ffi.rs b/rust/discovery/src/ffi.rs
new file mode 100644 (file)
index 0000000..41ba735
--- /dev/null
+++ b/rust/discovery/src/ffi.rs
@@ -0,0 +1,105 @@
+use std::ffi::CString;
+use libc::{c_char, c_int, sockaddr_in};
+use crate::{discover_devices, discovery::list_interfaces, DiscoveredDevice, NetworkInfo};
+use std::net::SocketAddr;
+
+#[repr(C)]
+pub struct CFfiNetworkInfo {
+    mac_address: [u8; 6],
+    address: sockaddr_in,
+    interface_address: sockaddr_in,
+    interface_netmask: sockaddr_in,
+    interface_name: [c_char; 64],
+}
+
+#[repr(C)]
+pub struct CFfiDiscoveredDevice {
+    protocol: u32,
+    device: u8,
+    name: [c_char; 32],
+    software_version: u8,
+    status: u32,
+    supported_receivers: u32,
+    frequency_min: f64,
+    frequency_max: f64,
+    network: CFfiNetworkInfo,
+    use_tcp: c_int,
+}
+
+#[no_mangle]
+pub extern "C" fn list_interfaces_ffi() {
+    list_interfaces();
+}
+
+#[no_mangle]
+pub extern "C" fn discover_devices_ffi(devices: *mut CFfiDiscoveredDevice, max_devices: c_int) -> c_int {
+    let rt = tokio::runtime::Runtime::new().unwrap();
+    
+    let rust_devices = rt.block_on(discover_devices());
+    let count = rust_devices.len().min(max_devices as usize);
+    
+    let devices_slice = unsafe { std::slice::from_raw_parts_mut(devices, count) };
+    
+    for (i, device) in rust_devices.iter().take(count).enumerate() {
+        devices_slice[i] = convert_to_c_device(device);
+    }
+    
+    count as c_int
+}
+
+fn convert_to_c_device(device: &DiscoveredDevice) -> CFfiDiscoveredDevice {
+    let name_c = CString::new(device.name.clone()).unwrap();
+    let mut name_arr = [0i8; 32];
+    for (i, &b) in name_c.as_bytes().iter().enumerate().take(31) {
+        name_arr[i] = b as i8;
+    }
+
+    CFfiDiscoveredDevice {
+        protocol: device.protocol,
+        device: device.device,
+        name: name_arr,
+        software_version: device.software_version,
+        status: device.status,
+        supported_receivers: device.supported_receivers,
+        frequency_min: device.frequency_min,
+        frequency_max: device.frequency_max,
+        network: convert_to_c_network(&device.network),
+        use_tcp: if device.use_tcp { 1 } else { 0 },
+    }
+}
+
+fn convert_to_c_network(network: &NetworkInfo) -> CFfiNetworkInfo {
+    let name_c = CString::new(network.interface_name.clone()).unwrap();
+    let mut name_arr = [0i8; 64];
+    for (i, &b) in name_c.as_bytes().iter().enumerate().take(63) {
+        name_arr[i] = b as i8;
+    }
+
+    CFfiNetworkInfo {
+        mac_address: network.mac_address,
+        address: socketaddr_to_sockaddr_in(&network.address),
+        interface_address: network.interface_address
+            .map(|addr| socketaddr_to_sockaddr_in(&addr))
+            .unwrap_or_else(|| unsafe { std::mem::zeroed() }),
+        interface_netmask: network.interface_netmask
+            .map(|addr| socketaddr_to_sockaddr_in(&addr))
+            .unwrap_or_else(|| unsafe { std::mem::zeroed() }),
+        interface_name: name_arr,
+    }
+}
+
+fn socketaddr_to_sockaddr_in(addr: &SocketAddr) -> sockaddr_in {
+    match addr {
+        SocketAddr::V4(addr) => unsafe {
+            let mut saddr: sockaddr_in = std::mem::zeroed();
+            saddr.sin_family = libc::AF_INET as u16;
+            saddr.sin_port = addr.port().to_be();
+            saddr.sin_addr = libc::in_addr {
+                s_addr: u32::from(*addr.ip()).to_be(),
+            };
+            saddr
+        },
+        _ => unsafe { std::mem::zeroed() },
+    }
+}
+

diff --git a/rust/discovery/src/lib.rs b/rust/discovery/src/lib.rs
new file mode 100644 (file)
index 0000000..64f5b2c
--- /dev/null
+++ b/rust/discovery/src/lib.rs
@@ -0,0 +1,7 @@
+mod discovery;
+mod ffi;
+mod types;
+
+pub use discovery::discover_devices;
+pub use types::*;
+

diff --git a/rust/discovery/src/types.rs b/rust/discovery/src/types.rs
new file mode 100644 (file)
index 0000000..ed08914
--- /dev/null
+++ b/rust/discovery/src/types.rs
@@ -0,0 +1,24 @@
+use std::net::SocketAddr;
+
+#[derive(Debug, Clone)]
+pub struct NetworkInfo {
+    pub mac_address: [u8; 6],
+    pub address: SocketAddr,
+    pub interface_address: Option<SocketAddr>,
+    pub interface_netmask: Option<SocketAddr>,
+    pub interface_name: String,
+}
+
+#[derive(Debug, Clone)]
+pub struct DiscoveredDevice {
+    pub protocol: u32,
+    pub device: u8,
+    pub name: String,
+    pub software_version: u8,
+    pub status: u32,
+    pub supported_receivers: u32,
+    pub frequency_min: f64,
+    pub frequency_max: f64,
+    pub network: NetworkInfo,
+    pub use_tcp: bool,
+}