diff --git a/src/cloud.rs b/src/cloud.rs
index 9640ec9..53a967c 100644
--- a/src/cloud.rs
+++ b/src/cloud.rs
@@ -445,7 +445,7 @@ impl<D: Device, P: Protocol, T: Table, S: Socket, TS: TimeSource> GenericCloud<D
         debug!("Connecting to {:?}", addr);
         let subnets = self.addresses.clone();
         let node_id = self.node_id;
-        let mut msg = Message::Init(0, node_id, subnets.clone(), self.peer_timeout_publish);
+        let mut msg = Message::Init(0, node_id, subnets, self.peer_timeout_publish);
         self.send_msg(addr, &mut msg)
     }
 
diff --git a/src/config.rs b/src/config.rs
index e847fbb..81d4cf7 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -447,7 +447,6 @@ fn config_merge() {
         group: Some("root".to_string()),
         pid_file: Some("/run/vpncloud-mynet.run".to_string()),
         stats_file: Some("/var/log/vpncloud-mynet.stats".to_string()),
-        daemonize: true,
-        ..Default::default()
+        daemonize: true
     });
 }
diff --git a/src/crypto.rs b/src/crypto.rs
index 8589af6..10efabe 100644
--- a/src/crypto.rs
+++ b/src/crypto.rs
@@ -171,9 +171,7 @@ fn encrypt_decrypt_chacha20poly1305() {
     let msg_bytes = msg.as_bytes();
     let mut buffer = [0u8; 1024];
     let header = [0u8; 8];
-    for i in 0..msg_bytes.len() {
-        buffer[i] = msg_bytes[i];
-    }
+    buffer[..msg_bytes.len()].clone_from_slice(&msg_bytes);
     let mut nonce1 = [0u8; 12];
     let size = sender.encrypt(&mut buffer, msg_bytes.len(), &mut nonce1, &header);
     assert_eq!(size, msg_bytes.len() + sender.additional_bytes());
@@ -195,9 +193,7 @@ fn encrypt_decrypt_aes256() {
     let msg_bytes = msg.as_bytes();
     let mut buffer = [0u8; 1024];
     let header = [0u8; 8];
-    for i in 0..msg_bytes.len() {
-        buffer[i] = msg_bytes[i];
-    }
+    buffer[..msg_bytes.len()].clone_from_slice(&msg_bytes);
     let mut nonce1 = [0u8; 12];
     let size = sender.encrypt(&mut buffer, msg_bytes.len(), &mut nonce1, &header);
     assert_eq!(size, msg_bytes.len() + sender.additional_bytes());
diff --git a/src/main.rs b/src/main.rs
index e619933..c919cbc 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -59,7 +59,7 @@ use crate::{
 const VERSION: u8 = 1;
 const MAGIC: HeaderMagic = *b"vpn\x01";
 
-static USAGE: &'static str = include_str!("usage.txt");
+static USAGE: &str = include_str!("usage.txt");
 
 
 #[derive(Deserialize, Debug, Default)]
@@ -240,6 +240,7 @@ impl<P: Protocol> AnyCloud<P> {
 }
 
 
+#[allow(clippy::cognitive_complexity)]
 fn run<P: Protocol>(config: Config) {
     let device = try_fail!(
         TunTapDevice::new(&config.device_name, config.device_type, config.device_path.as_ref().map(|s| s as &str)),
diff --git a/src/tests/nat.rs b/src/tests/nat.rs
index 2387adf..9b60fa6 100644
--- a/src/tests/nat.rs
+++ b/src/tests/nat.rs
@@ -60,6 +60,7 @@ fn connect_nat_3_peers() {
 }
 
 #[test]
+#[allow(clippy::cognitive_complexity)]
 fn nat_keepalive() {
     init_debug_logger();
     MockTimeSource::set_time(0);
diff --git a/src/tests/peers.rs b/src/tests/peers.rs
index 3bfc2a9..77431c2 100644
--- a/src/tests/peers.rs
+++ b/src/tests/peers.rs
@@ -5,6 +5,7 @@
 use super::*;
 
 #[test]
+#[allow(clippy::cognitive_complexity)]
 fn connect_v4() {
     let mut node1 = create_tap_node(false);
     let node1_addr = addr!("1.2.3.4:5678");
@@ -56,6 +57,7 @@ fn connect_v6() {
 }
 
 #[test]
+#[allow(clippy::cognitive_complexity)]
 fn cross_connect() {
     let mut node1 = create_tap_node(false);
     let node1_addr = addr!("1.1.1.1:1111");
diff --git a/src/udpmessage.rs b/src/udpmessage.rs
index d1f5da1..02fa6b1 100644
--- a/src/udpmessage.rs
+++ b/src/udpmessage.rs
@@ -190,11 +190,7 @@ pub fn decode<'a>(data: &'a mut [u8], magic: HeaderMagic, crypto: &Crypto) -> Re
                 pos += read;
                 addrs.push(range);
             }
-            let mut peer_timeout = 1800;
-            if data.len() >= pos + 2 {
-                peer_timeout = Encoder::read_u16(&data[pos..]);
-                // pos += 2; never read
-            }
+            let peer_timeout = if data.len() >= pos + 2 { Encoder::read_u16(&data[pos..]) } else { 1800 };
             Message::Init(stage, node_id, addrs, peer_timeout)
         }
         3 => Message::Close,
@@ -353,12 +349,10 @@ fn udpmessage_packet() {
         let res = encode(&mut msg, &mut [], MAGIC, &mut crypto);
         assert_eq!(res.len(), 13);
         assert_eq!(&res[..8], &[118, 112, 110, 1, 0, 0, 0, 0]);
-        for i in 0..res.len() {
-            buf[i] = res[i];
-        }
+        buf[..res.len()].clone_from_slice(&res);
         len = res.len();
     }
-    let msg2 = decode(&mut buf[..len], MAGIC, &mut crypto).unwrap();
+    let msg2 = decode(&mut buf[..len], MAGIC, &crypto).unwrap();
     assert_eq!(msg, msg2);
 }
 
@@ -373,9 +367,7 @@ fn udpmessage_encrypted() {
         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
     ];
     let mut orig_payload = [0; 133];
-    for i in 0..payload.len() {
-        orig_payload[i] = payload[i];
-    }
+    orig_payload[..payload.len()].clone_from_slice(&payload);
     let orig_msg = Message::Data(&mut orig_payload, 64, 69);
     let mut msg = Message::Data(&mut payload, 64, 69);
     let mut buf = [0; 1024];
@@ -384,12 +376,10 @@ fn udpmessage_encrypted() {
         let res = encode(&mut msg, &mut [], MAGIC, &mut crypto);
         assert_eq!(res.len(), 41);
         assert_eq!(&res[..8], &[118, 112, 110, 1, 1, 0, 0, 0]);
-        for i in 0..res.len() {
-            buf[i] = res[i];
-        }
+        buf[..res.len()].clone_from_slice(&res);
         len = res.len();
     }
-    let msg2 = decode(&mut buf[..len], MAGIC, &mut crypto).unwrap();
+    let msg2 = decode(&mut buf[..len], MAGIC, &crypto).unwrap();
     assert_eq!(orig_msg, msg2);
 }
 
@@ -414,16 +404,16 @@ fn udpmessage_peers() {
             assert_eq!(res[i], should[i]);
         }
     }
-    let msg2 = decode(&mut should, MAGIC, &mut crypto).unwrap();
+    let msg2 = decode(&mut should, MAGIC, &crypto).unwrap();
     assert_eq!(msg, msg2);
     // Missing IPv4 count
-    assert!(decode(&mut [118, 112, 110, 1, 0, 0, 0, 1], MAGIC, &mut crypto).is_err());
+    assert!(decode(&mut [118, 112, 110, 1, 0, 0, 0, 1], MAGIC, &crypto).is_err());
     // Truncated IPv4
-    assert!(decode(&mut [118, 112, 110, 1, 0, 0, 0, 1, 1], MAGIC, &mut crypto).is_err());
+    assert!(decode(&mut [118, 112, 110, 1, 0, 0, 0, 1, 1], MAGIC, &crypto).is_err());
     // Missing IPv6 count
-    assert!(decode(&mut [118, 112, 110, 1, 0, 0, 0, 1, 1, 1, 2, 3, 4, 0, 0], MAGIC, &mut crypto).is_err());
+    assert!(decode(&mut [118, 112, 110, 1, 0, 0, 0, 1, 1, 1, 2, 3, 4, 0, 0], MAGIC, &crypto).is_err());
     // Truncated IPv6
-    assert!(decode(&mut [118, 112, 110, 1, 0, 0, 0, 1, 1, 1, 2, 3, 4, 0, 0, 1], MAGIC, &mut crypto).is_err());
+    assert!(decode(&mut [118, 112, 110, 1, 0, 0, 0, 1, 1, 1, 2, 3, 4, 0, 0, 1], MAGIC, &crypto).is_err());
 }
 
 #[test]
@@ -448,7 +438,7 @@ fn udpmessage_init() {
             assert_eq!(res[i], should[i]);
         }
     }
-    let msg2 = decode(&mut should, MAGIC, &mut crypto).unwrap();
+    let msg2 = decode(&mut should, MAGIC, &crypto).unwrap();
     assert_eq!(msg, msg2);
 }
 
@@ -463,31 +453,31 @@ fn udpmessage_close() {
         assert_eq!(res.len(), 8);
         assert_eq!(&res, &should);
     }
-    let msg2 = decode(&mut should, MAGIC, &mut crypto).unwrap();
+    let msg2 = decode(&mut should, MAGIC, &crypto).unwrap();
     assert_eq!(msg, msg2);
 }
 
 #[test]
 fn udpmessage_invalid() {
-    let mut crypto = Crypto::None;
-    assert!(decode(&mut [0x76, 0x70, 0x6e, 1, 0, 0, 0, 0], MAGIC, &mut crypto).is_ok());
+    let crypto = Crypto::None;
+    assert!(decode(&mut [0x76, 0x70, 0x6e, 1, 0, 0, 0, 0], MAGIC, &crypto).is_ok());
     // too short
-    assert!(decode(&mut [], MAGIC, &mut crypto).is_err());
+    assert!(decode(&mut [], MAGIC, &crypto).is_err());
     // invalid protocol
-    assert!(decode(&mut [0, 1, 2, 0, 0, 0, 0, 0], MAGIC, &mut crypto).is_err());
+    assert!(decode(&mut [0, 1, 2, 0, 0, 0, 0, 0], MAGIC, &crypto).is_err());
     // invalid version
-    assert!(decode(&mut [0x76, 0x70, 0x6e, 0xaa, 0, 0, 0, 0], MAGIC, &mut crypto).is_err());
+    assert!(decode(&mut [0x76, 0x70, 0x6e, 0xaa, 0, 0, 0, 0], MAGIC, &crypto).is_err());
     // invalid crypto
-    assert!(decode(&mut [0x76, 0x70, 0x6e, 1, 0xaa, 0, 0, 0], MAGIC, &mut crypto).is_err());
+    assert!(decode(&mut [0x76, 0x70, 0x6e, 1, 0xaa, 0, 0, 0], MAGIC, &crypto).is_err());
     // invalid msg type
-    assert!(decode(&mut [0x76, 0x70, 0x6e, 1, 0, 0, 0, 0xaa], MAGIC, &mut crypto).is_err());
+    assert!(decode(&mut [0x76, 0x70, 0x6e, 1, 0, 0, 0, 0xaa], MAGIC, &crypto).is_err());
 }
 
 #[test]
 fn udpmessage_invalid_crypto() {
-    let mut crypto = Crypto::from_shared_key(CryptoMethod::ChaCha20, "test");
+    let crypto = Crypto::from_shared_key(CryptoMethod::ChaCha20, "test");
     // truncated crypto
-    assert!(decode(&mut [0x76, 0x70, 0x6e, 1, 1, 0, 0, 0], MAGIC, &mut crypto).is_err());
+    assert!(decode(&mut [0x76, 0x70, 0x6e, 1, 1, 0, 0, 0], MAGIC, &crypto).is_err());
 }
 
 #[test]
diff --git a/src/util.rs b/src/util.rs
index 6dd7ee7..54a7c45 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -254,9 +254,9 @@ impl TimeSource for MockTimeSource {
 /// Helper function that multiplies the base62 data in buf[0..buflen] by 16 and adds m to it
 fn base62_add_mult_16(buf: &mut [u8], mut buflen: usize, m: u8) -> usize {
     let mut d: usize = m as usize;
-    for i in 0..buflen {
-        d += buf[i] as usize * 16;
-        buf[i] = (d % 62) as u8;
+    for item in buf.iter_mut().take(buflen) {
+        d += *item as usize * 16;
+        *item = (d % 62) as u8;
         d /= 62;
     }
     assert!(d < 62);
@@ -298,9 +298,9 @@ pub fn from_base62(data: &str) -> Result<Vec<u8>, char> {
             'a'..='z' => ((c as usize) % ('a' as usize)) + 36,
             _ => return Err(c)
         };
-        for i in 0..buf.len() {
-            val += buf[i] as usize * 62;
-            buf[i] = (val % 256) as u8;
+        for item in &mut buf {
+            val += *item as usize * 62;
+            *item = (val % 256) as u8;
             val /= 256;
         }
         if val > 0 {