Change the type for port to u16 in config.

lib/src/config/config.rs

@@ -15,7 +15,7 @@ pub struct Config {
     /// The address to serve on.
     pub address: String,
     /// The port to serve on.
-    pub port: usize,
+    pub port: u16,
     /// How much information to log.
     pub log_level: LoggingLevel,
     /// The environment that this configuration corresponds to.
@@ -99,7 +99,7 @@ impl Config {
     /// returned:
     ///
     ///   * **address**: String
-    ///   * **port**: Integer
+    ///   * **port**: Integer (16-bit unsigned)
     ///   * **session_key**: String (192-bit base64)
     ///   * **log**: String
     ///
@@ -119,7 +119,11 @@ impl Config {
                 return Err(self.bad_type(name, val, "an unsigned integer"));
             }
 
-            self.port = port as usize;
+            if port > (u16::max_value() as i64) {
+                return Err(self.bad_type(name, val, "a 16-bit unsigned integer"))
+            }
+
+            self.port = port as u16;
         } else if name == "session_key" {
             let key = parse!(self, name, val, as_str, "a string")?;
             if key.len() != 32 {
@@ -231,7 +235,7 @@ impl Config {
 
     /// Sets the `port` in `self` to `var` and returns the structure.
     #[inline(always)]
-    pub fn port(mut self, var: usize) -> Self {
+    pub fn port(mut self, var: u16) -> Self {
         self.port = var;
         self
     }
@@ -284,4 +288,3 @@ impl PartialEq for Config {
             && self.filepath == other.filepath
     }
 }
-

lib/src/config/mod.rs

@@ -567,6 +567,13 @@ mod test {
                       "#.to_string(), TEST_CONFIG_FILENAME), {
                           default_config(Staging).port(6000)
                       });
+
+        check_config!(RocketConfig::parse(r#"
+                          [stage]
+                          port = 65535
+                      "#.to_string(), TEST_CONFIG_FILENAME), {
+                          default_config(Staging).port(65535)
+                      });
     }
 
     #[test]
@@ -589,6 +596,16 @@ mod test {
             [staging]
             port = -1
         "#.to_string(), TEST_CONFIG_FILENAME).is_err());
+
+        assert!(RocketConfig::parse(r#"
+            [staging]
+            port = 65536
+        "#.to_string(), TEST_CONFIG_FILENAME).is_err());
+
+        assert!(RocketConfig::parse(r#"
+            [staging]
+            port = 105836
+        "#.to_string(), TEST_CONFIG_FILENAME).is_err());
     }
 
     #[test]

lib/src/rocket.rs

@@ -25,7 +25,7 @@ use http::uri::URI;
 /// application.
 pub struct Rocket {
     address: String,
-    port: usize,
+    port: u16,
     router: Router,
     default_catchers: HashMap<u16, Catcher>,
     catchers: HashMap<u16, Catcher>,