Add Ipv4Net and Ipv6Net struct (#2)

Fields: addr, prefix_len, and netmask

src/gateway/mod.rs

@@ -33,14 +33,14 @@ pub fn get_default_gateway() -> Result<Gateway, String> {
     for iface in interfaces {
         match local_ip {
             IpAddr::V4(local_ipv4) => {
-                if iface.ipv4.contains(&local_ipv4) {
+                if iface.ipv4.iter().any(|x| x.addr == local_ipv4) {
                     if let Some(gateway) = iface.gateway {
                         return Ok(gateway);
                     }
                 }
             },
             IpAddr::V6(local_ipv6) => {
-                if iface.ipv6.contains(&local_ipv6) {
+                if iface.ipv6.iter().any(|x| x.addr == local_ipv6) {
                     if let Some(gateway) = iface.gateway {
                         return Ok(gateway);
                     }

src/interface/mod.rs

@@ -11,7 +11,8 @@ mod windows;
 #[cfg(target_os = "windows")]
 use self::windows::*;
 
-use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+use std::net::IpAddr;
+use crate::ip::{Ipv4Net, Ipv6Net};
 use crate::gateway::{Gateway};
 
 /// Structure of MAC address
@@ -71,10 +72,10 @@ pub struct Interface {
     pub description: Option<String>,
     /// MAC address of network interface
     pub mac_addr: Option<MacAddr>,
-    /// List of IPv4 addresses for the network interface
-    pub ipv4: Vec<Ipv4Addr>,
-    /// List of IPv6 addresses for the network interface
-    pub ipv6: Vec<Ipv6Addr>,
+    /// List of Ipv4Net for the network interface
+    pub ipv4: Vec<Ipv4Net>,
+    /// List of Ipv6Net for the network interface
+    pub ipv6: Vec<Ipv6Net>,
     /// Default gateway for the network interface
     pub gateway: Option<Gateway>,
 }
@@ -89,12 +90,12 @@ pub fn get_default_interface() -> Result<Interface, String> {
     for iface in interfaces {
         match local_ip {
             IpAddr::V4(local_ipv4) => {
-                if iface.ipv4.contains(&local_ipv4) {
+                if iface.ipv4.iter().any(|x| x.addr == local_ipv4) {
                     return Ok(iface);
                 }
             },
             IpAddr::V6(local_ipv6) => {
-                if iface.ipv6.contains(&local_ipv6) {
+                if iface.ipv6.iter().any(|x| x.addr == local_ipv6) {
                     return Ok(iface);
                 }
             },
@@ -113,12 +114,12 @@ pub fn get_default_interface_index() -> Option<u32> {
     for iface in interfaces {
         match local_ip {
             IpAddr::V4(local_ipv4) => {
-                if iface.ipv4.contains(&local_ipv4) {
+                if iface.ipv4.iter().any(|x| x.addr == local_ipv4) {
                     return Some(iface.index);
                 }
             },
             IpAddr::V6(local_ipv6) => {
-                if iface.ipv6.contains(&local_ipv6) {
+                if iface.ipv6.iter().any(|x| x.addr == local_ipv6) {
                     return Some(iface.index);
                 }
             },
@@ -137,12 +138,12 @@ pub fn get_default_interface_name() -> Option<String> {
     for iface in interfaces {
         match local_ip {
             IpAddr::V4(local_ipv4) => {
-                if iface.ipv4.contains(&local_ipv4) {
+                if iface.ipv4.iter().any(|x| x.addr == local_ipv4) {
                     return Some(iface.name);
                 }
             },
             IpAddr::V6(local_ipv6) => {
-                if iface.ipv6.contains(&local_ipv6) {
+                if iface.ipv6.iter().any(|x| x.addr == local_ipv6) {
                     return Some(iface.name);
                 }
             },

src/interface/unix.rs

@@ -2,6 +2,7 @@ use super::Interface;
 use super::MacAddr;
 use crate::sys;
 use crate::gateway;
+use crate::ip::{Ipv4Net, Ipv6Net};
 
 use libc;
 use std::ffi::{CStr, CString};
@@ -20,7 +21,7 @@ pub fn interfaces() -> Vec<Interface> {
     for iface in &mut interfaces {
         match local_ip {
             IpAddr::V4(local_ipv4) => {
-                if iface.ipv4.contains(&local_ipv4) {
+                if iface.ipv4.iter().any(|x| x.addr == local_ipv4) {
                     match gateway::unix::get_default_gateway(iface.name.clone()) {
                         Ok(gateway) => {
                             iface.gateway = Some(gateway);
@@ -30,7 +31,7 @@ pub fn interfaces() -> Vec<Interface> {
                 }
             },
             IpAddr::V6(local_ipv6) => {
-                if iface.ipv6.contains(&local_ipv6) {
+                if iface.ipv6.iter().any(|x| x.addr == local_ipv6) {
                     match gateway::unix::get_default_gateway(iface.name.clone()) {
                         Ok(gateway) => {
                             iface.gateway = Some(gateway);
@@ -92,15 +93,36 @@ pub fn unix_interfaces() -> Vec<Interface> {
         let bytes = unsafe { CStr::from_ptr(c_str).to_bytes() };
         let name = unsafe {from_utf8_unchecked(bytes).to_owned() };
         let (mac, ip) = sockaddr_to_network_addr(addr_ref.ifa_addr as *const libc::sockaddr);
-        let mut ini_ipv4: Vec<Ipv4Addr> = vec![];
-        let mut ini_ipv6: Vec<Ipv6Addr> = vec![];
+        let (_, netmask) = sockaddr_to_network_addr(addr_ref.ifa_netmask as *const libc::sockaddr);
+        let mut ini_ipv4: Vec<Ipv4Net> = vec![];
+        let mut ini_ipv6: Vec<Ipv6Net> = vec![];
         if let Some(ip) = ip {
             match ip {
                 IpAddr::V4(ipv4) => {
-                    ini_ipv4.push(ipv4);
+                    let netmask: Ipv4Addr = match netmask {
+                        Some(netmask) => {
+                            match netmask {
+                                IpAddr::V4(netmask) => netmask,
+                                IpAddr::V6(_) => Ipv4Addr::UNSPECIFIED,
+                            }
+                        },
+                        None => Ipv4Addr::UNSPECIFIED,
+                    };
+                    let ipv4_net: Ipv4Net = Ipv4Net::new_with_netmask(ipv4, netmask);
+                    ini_ipv4.push(ipv4_net);
                 },
                 IpAddr::V6(ipv6) => {
-                    ini_ipv6.push(ipv6);
+                    let netmask: Ipv6Addr = match netmask {
+                        Some(netmask) => {
+                            match netmask {
+                                IpAddr::V4(_) => Ipv6Addr::UNSPECIFIED,
+                                IpAddr::V6(netmask) => netmask,
+                            }
+                        },
+                        None => Ipv6Addr::UNSPECIFIED,
+                    };
+                    let ipv6_net: Ipv6Net = Ipv6Net::new_with_netmask(ipv6, netmask);
+                    ini_ipv6.push(ipv6_net);
                 },
             }
         }
@@ -122,10 +144,30 @@ pub fn unix_interfaces() -> Vec<Interface> {
                 if let Some(ip) = ip {
                     match ip {
                         IpAddr::V4(ipv4) => {
-                            iface.ipv4.push(ipv4);
+                            let netmask: Ipv4Addr = match netmask {
+                                Some(netmask) => {
+                                    match netmask {
+                                        IpAddr::V4(netmask) => netmask,
+                                        IpAddr::V6(_) => Ipv4Addr::UNSPECIFIED,
+                                    }
+                                },
+                                None => Ipv4Addr::UNSPECIFIED,
+                            };
+                            let ipv4_net: Ipv4Net = Ipv4Net::new_with_netmask(ipv4, netmask);
+                            iface.ipv4.push(ipv4_net);
                         },
                         IpAddr::V6(ipv6) => {
-                            iface.ipv6.push(ipv6);
+                            let netmask: Ipv6Addr = match netmask {
+                                Some(netmask) => {
+                                    match netmask {
+                                        IpAddr::V4(_) => Ipv6Addr::UNSPECIFIED,
+                                        IpAddr::V6(netmask) => netmask,
+                                    }
+                                },
+                                None => Ipv6Addr::UNSPECIFIED,
+                            };
+                            let ipv6_net: Ipv6Net = Ipv6Net::new_with_netmask(ipv6, netmask);
+                            iface.ipv6.push(ipv6_net);
                         },
                     }
                 }

src/ip.rs

@@ -0,0 +1,95 @@
+use std::net::{Ipv4Addr, Ipv6Addr};
+
+#[derive(Clone, Debug)]
+pub struct Ipv4Net {
+    pub addr: Ipv4Addr,
+    pub prefix_len: u8,
+    pub netmask: Ipv4Addr,
+}
+
+impl Ipv4Net {
+    pub fn new(ipv4_addr: Ipv4Addr, prefix_len: u8) -> Ipv4Net {
+        Ipv4Net {
+            addr: ipv4_addr,
+            prefix_len: prefix_len,
+            netmask: prefix_to_ipv4_netmask(prefix_len),
+        }
+    }
+    pub fn new_with_netmask(ipv4_addr: Ipv4Addr, netmask: Ipv4Addr) -> Ipv4Net {
+        Ipv4Net {
+            addr: ipv4_addr,
+            prefix_len: ipv4_netmask_to_prefix(netmask),
+            netmask: netmask,
+        }
+    }
+}
+
+#[derive(Clone, Debug)]
+pub struct Ipv6Net {
+    pub addr: Ipv6Addr,
+    pub prefix_len: u8,
+    pub netmask: Ipv6Addr,
+}
+
+impl Ipv6Net {
+    pub fn new(ipv6_addr: Ipv6Addr, prefix_len: u8) -> Ipv6Net {
+        Ipv6Net {
+            addr: ipv6_addr,
+            prefix_len: prefix_len,
+            netmask: prefix_to_ipv6_netmask(prefix_len),
+        }
+    }
+    pub fn new_with_netmask(ipv6_addr: Ipv6Addr, netmask: Ipv6Addr) -> Ipv6Net {
+        Ipv6Net {
+            addr: ipv6_addr,
+            prefix_len: ipv6_netmask_to_prefix(netmask),
+            netmask: netmask,
+        }
+    }
+}
+
+fn ipv4_netmask_to_prefix(netmask: Ipv4Addr) -> u8 {
+    let netmask = u32::from(netmask);
+    let prefix = (!netmask).leading_zeros() as u8;
+    if (u64::from(netmask) << prefix) & 0xffff_ffff != 0 {
+        0
+    } else {
+        prefix
+    }
+}
+
+fn ipv6_netmask_to_prefix(netmask: Ipv6Addr) -> u8 {
+    let netmask = netmask.segments();
+    let mut mask_iter = netmask.iter();
+    let mut prefix = 0;
+    for &segment in &mut mask_iter {
+        if segment == 0xffff {
+            prefix += 16;
+        } else if segment == 0 {
+            break;
+        } else {
+            let prefix_bits = (!segment).leading_zeros() as u8;
+            if segment << prefix_bits != 0 {
+                return 0;
+            }
+            prefix += prefix_bits;
+            break;
+        }
+    }
+    for &segment in mask_iter {
+        if segment != 0 {
+            return 0;
+        }
+    }
+    prefix
+}
+
+fn prefix_to_ipv4_netmask(prefix_len: u8) -> Ipv4Addr {
+    let netmask_u32: u32 = u32::max_value().checked_shl(32 - prefix_len as u32).unwrap_or(0);
+    Ipv4Addr::from(netmask_u32)
+}
+
+fn prefix_to_ipv6_netmask(prefix_len: u8) -> Ipv6Addr {
+    let netmask_u128: u128 = u128::max_value().checked_shl((128 - prefix_len) as u32).unwrap_or(u128::min_value());
+    Ipv6Addr::from(netmask_u128)
+}

src/lib.rs

@@ -5,6 +5,7 @@ mod bpf;
 #[cfg(any(target_os = "macos", target_os = "openbsd", target_os = "freebsd", target_os = "netbsd", target_os = "ios"))]
 mod socket;
 
+pub mod ip;
 pub mod interface;
 pub mod gateway;