Added support for Classless Static Routes

Cargo.lock

@@ -11,31 +11,11 @@ dependencies = [
  "memchr",
 ]
 
-[[package]]
-name = "autocfg"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
-
-[[package]]
-name = "bitflags"
-version = "1.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
-
-[[package]]
-name = "cfg-if"
-version = "1.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
-
 [[package]]
 name = "dhcprs"
-version = "0.1.0"
+version = "0.1.3"
 dependencies = [
  "eui48",
- "libc",
- "nix",
 ]
 
 [[package]]
@@ -48,47 +28,12 @@ dependencies = [
  "rustc-serialize",
 ]
 
-[[package]]
-name = "libc"
-version = "0.2.133"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c0f80d65747a3e43d1596c7c5492d95d5edddaabd45a7fcdb02b95f644164966"
-
 [[package]]
 name = "memchr"
 version = "2.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
 
-[[package]]
-name = "memoffset"
-version = "0.6.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5aa361d4faea93603064a027415f07bd8e1d5c88c9fbf68bf56a285428fd79ce"
-dependencies = [
- "autocfg",
-]
-
-[[package]]
-name = "nix"
-version = "0.25.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e322c04a9e3440c327fca7b6c8a63e6890a32fa2ad689db972425f07e0d22abb"
-dependencies = [
- "autocfg",
- "bitflags",
- "cfg-if",
- "libc",
- "memoffset",
- "pin-utils",
-]
-
-[[package]]
-name = "pin-utils"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
-
 [[package]]
 name = "regex"
 version = "1.6.0"

Cargo.toml

@@ -1,9 +1,10 @@
 [package]
 name = "dhcprs"
-version = "0.1.0"
+version = "0.1.3"
 edition = "2021"
 description = "A library for encoding and decoding DHCP/BOOTP packets"
 license-file = "LICENSE"
+repository = "https://github.com/xnoe/dhcprs"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
@@ -12,6 +13,4 @@ name = "dhcprs"
 path = "src/lib.rs"
 
 [dependencies]
-nix = "0.25.0"
-eui48 = "1.1.0"
-libc = "0.2.133"
+eui48 = "1.1.0"

src/bootp.rs

@@ -85,22 +85,22 @@ impl From<BOOTPPacket> for RawBOOTPPacket {
             secs: item.secs,
             flags: item.flags,
             ciaddr: if item.ciaddr.is_some() {
-                item.ciaddr.unwrap().into()
+                u32::to_be(item.ciaddr.unwrap().into())
             } else {
                 0
             },
             yiaddr: if item.yiaddr.is_some() {
-                item.yiaddr.unwrap().into()
+                u32::to_be(item.yiaddr.unwrap().into())
             } else {
                 0
             },
             siaddr: if item.siaddr.is_some() {
-                item.siaddr.unwrap().into()
+                u32::to_be(item.siaddr.unwrap().into())
             } else {
                 0
             },
             giaddr: if item.giaddr.is_some() {
-                item.giaddr.unwrap().into()
+                u32::to_be(item.giaddr.unwrap().into())
             } else {
                 0
             },
@@ -123,22 +123,22 @@ impl From<RawBOOTPPacket> for BOOTPPacket {
             ciaddr: if item.ciaddr == 0 {
                 None
             } else {
-                Some(std::net::Ipv4Addr::from(item.ciaddr))
+                Some(std::net::Ipv4Addr::from(u32::from_be(item.ciaddr)))
             },
             yiaddr: if item.yiaddr == 0 {
                 None
             } else {
-                Some(std::net::Ipv4Addr::from(item.yiaddr))
+                Some(std::net::Ipv4Addr::from(u32::from_be(item.yiaddr)))
             },
             siaddr: if item.siaddr == 0 {
                 None
             } else {
-                Some(std::net::Ipv4Addr::from(item.siaddr))
+                Some(std::net::Ipv4Addr::from(u32::from_be(item.siaddr)))
             },
             giaddr: if item.giaddr == 0 {
                 None
             } else {
-                Some(std::net::Ipv4Addr::from(item.giaddr))
+                Some(std::net::Ipv4Addr::from(u32::from_be(item.giaddr)))
             },
             chaddr: MacAddress::from_bytes(&item.chaddr[0..6]).unwrap(),
             sname: item.sname,

src/dhcp.rs

@@ -166,10 +166,10 @@ pub enum DHCPOption {
 
     /*// RFC4833
     TimezonePOSIX(String), // 100 N IEEE 1003.1 String
-    TimezoneDB(String),    // 101 N Reference to TZ Database
+    TimezoneDB(String),    // 101 N Reference to TZ Database*/
 
     // RFC3442
-    ClasslessStaticRoute(Vec<(Ipv4Addr, u32, Ipv4Addr)>), // 121 n d1 ... dN r1 r2 r3 r4 d1 ... dN r1 r2 r3 r4*/
+    ClasslessStaticRoute(Vec<(Ipv4Addr, u8, Ipv4Addr)>), // 121 n d1 ... dN r1 r2 r3 r4 d1 ... dN r1 r2 r3 r4
 
     // Catchall
     Option(u8, Vec<u8>),
@@ -184,6 +184,12 @@ macro_rules! break_unwrap {
     };
 }
 
+macro_rules! div_ceil {
+    ($lhs:expr, $rhs:expr) => {
+        $lhs / $rhs + if $lhs % $rhs != 0 { 1 } else { 0 }
+    }
+}
+
 impl DHCPOption {
     pub fn from_bytes(bytes: &[u8]) -> Vec<DHCPOption> {
         let mut options: Vec<DHCPOption> = Vec::new();
@@ -1230,6 +1236,28 @@ impl DHCPOption {
                     options.push(DHCPOption::STDAServer(addresses));
                 }
 
+                121 => {
+                    let mut length = break_unwrap!(iterator.next());
+                    let mut routes: Vec<(Ipv4Addr, u8, Ipv4Addr)> = Vec::new();
+
+                    while length > 0 {
+                        let prefix_length = break_unwrap!(iterator.next());
+                        let descriptor_length = div_ceil!(prefix_length, 8);
+
+                        let mut prefix_octets: [u8; 4] = [0;4];
+                        for count in 0..descriptor_length {
+                            prefix_octets[count as usize] = break_unwrap!(iterator.next());
+                        }
+
+                        let router = Ipv4Addr::new(break_unwrap!(iterator.next()),break_unwrap!(iterator.next()),break_unwrap!(iterator.next()),break_unwrap!(iterator.next()));
+
+                        routes.push((Ipv4Addr::from(prefix_octets), prefix_length, router));
+                        length -= 1 + descriptor_length + 4;
+                    }
+
+                    options.push(DHCPOption::ClasslessStaticRoute(routes));
+                }
+
                 // Catchall for if we cannot decode the option to a specific enum variant.
                 n => {
                     let count = break_unwrap!(iterator.next());
@@ -1801,6 +1829,17 @@ impl DHCPOption {
                     bytes.push(b.len() as u8);
                     bytes.extend_from_slice(&b);
                 }
+
+                DHCPOption::ClasslessStaticRoute(routes) => {
+                    bytes.push(121);
+                    bytes.push(routes.iter().fold(0, |acc, (_, prefix_length, _)| acc + 1 + div_ceil!(prefix_length, 8) + 4));
+                    for (prefix, prefix_length, router) in routes {
+                        let descriptor_length = div_ceil!(prefix_length, 8);
+                        bytes.push(prefix_length);
+                        bytes.extend_from_slice(&prefix.octets()[..descriptor_length as usize]);
+                        bytes.extend_from_slice(&router.octets());
+                    }
+                }
             }
         }