[WIP] Add initial implementation for netcat

Cargo.toml

@@ -30,8 +30,10 @@ lsb = [
 ]
 
 ping = ["libmesabox/ping"]
+nc = ["libmesabox/nc"]
 networking = [
-    "ping"
+    "ping",
+    "nc"
 ]
 
 cat = ["libmesabox/cat"]

libmesabox/Cargo.toml

@@ -28,8 +28,10 @@ lsb = [
 ]
 
 ping = ["chrono", "crossbeam", "libc", "pnet", "byteorder", "trust-dns-resolver", "mio", "socket2"]
+nc = ["tempfile", "socket2", "regex"]
 networking = [
-    "ping"
+    "ping",
+    "nc"
 ]
 
 cat = []
@@ -112,9 +114,11 @@ pnet = { version = "0.21.0", optional = true }
 byteorder = { version = "1.2.3", optional = true }
 trust-dns-resolver = { version = "0.9.0", optional = true }
 mio = { version = "0.6.14", optional = true }
-socket2 = { version = "0.3.5", optional = true }
+socket2 = { version = "0.3.5", optional = true, features = ["unix"] }
 walkdir = { version = "2.1.4", optional = true }
 fnv = { version = "1.0.6", optional = true }
 # use the git version until an update is finally published to crates.io
 rustyline = { git = "https://github.com/kkawakam/rustyline", optional = true }
 log = { version = "0.4.3", optional = true }
+tempfile = { version = "3.0.3", optional = true }
+regex = { version = "1.0.2", optional = true }

libmesabox/src/lib.rs

@@ -55,6 +55,10 @@ extern crate rustyline;
 #[cfg(feature = "log")]
 #[macro_use]
 extern crate log;
+#[cfg(feature = "tempfile")]
+extern crate tempfile;
+#[cfg(feature = "regex")]
+extern crate regex;
 
 use clap::{App, SubCommand};
 use std::env::{self, VarsOs};