Fix IPv6 address parsing and validation.

lib/src/config/config.rs

@@ -1,5 +1,5 @@
 use std::collections::HashMap;
-use std::net::ToSocketAddrs;
+use std::net::{IpAddr, lookup_host};
 use std::path::{Path, PathBuf};
 use std::sync::RwLock;
 use std::convert::AsRef;
@@ -268,19 +268,18 @@ impl Config {
     /// # fn config_test() -> Result<(), ConfigError> {
     /// let mut config = Config::new(Environment::Staging)?;
     /// assert!(config.set_address("localhost").is_ok());
+    /// assert!(config.set_address("::").is_ok());
     /// assert!(config.set_address("?").is_err());
     /// # Ok(())
     /// # }
     /// ```
     pub fn set_address<A: Into<String>>(&mut self, address: A) -> config::Result<()> {
         let address = address.into();
-        if address.contains(':') {
-            return Err(self.bad_type("address", "string", "a hostname or IP with no port"));
-        } else if format!("{}:{}", address, 80).to_socket_addrs().is_err() {
+        if address.parse::<IpAddr>().is_err() && lookup_host(&address).is_err() {
             return Err(self.bad_type("address", "string", "a valid hostname or IP"));
         }
 
-        self.address = address.into();
+        self.address = address;
         Ok(())
     }
 

lib/src/config/mod.rs

@@ -638,11 +638,19 @@ mod test {
                           default_config(Development).address("localhost")
                       });
 
+
+        check_config!(RocketConfig::parse(r#"
+                          [development]
+                          address = "::"
+                      "#.to_string(), TEST_CONFIG_FILENAME), {
+                          default_config(Development).address("::")
+                      });
+
         check_config!(RocketConfig::parse(r#"
                           [dev]
-                          address = "127.0.0.1"
+                          address = "2001:db8::370:7334"
                       "#.to_string(), TEST_CONFIG_FILENAME), {
-                          default_config(Development).address("127.0.0.1")
+                          default_config(Development).address("2001:db8::370:7334")
                       });
 
         check_config!(RocketConfig::parse(r#"
@@ -930,9 +938,9 @@ mod test {
 
             check_config!(RocketConfig::parse(format!(r#"
                               [{}]
-                              address = "7.6.5.4"
+                              address = "::1"
                           "#, GLOBAL_ENV_NAME), TEST_CONFIG_FILENAME), {
-                              default_config(*env).address("7.6.5.4")
+                              default_config(*env).address("::1")
                           });
 
             check_config!(RocketConfig::parse(format!(r#"

lib/src/lib.rs

@@ -5,6 +5,7 @@
 #![feature(const_fn)]
 #![feature(type_ascription)]
 #![feature(pub_restricted)]
+#![feature(lookup_host)]
 
 //! # Rocket - Core API Documentation
 //!