Up deps

CHANGELOG.md

@@ -5,8 +5,9 @@ This project follows [semantic versioning](http://semver.org).
 ### UNRELEASED
 
 - [added] Support for creating shell completions
+- [added] Support for hook scripts to handle certain situations
 - [removed] Removed dummy device type
-- [changed] Updated depdendencies
+- [changed] Updated dependencies
 - [changed] Changed Rust version to 1.49.0
 - [fixed] Added missing peer address propagation
 

Cargo.lock

@@ -52,9 +52,9 @@ checksum = "5988cb1d626264ac94100be357308f29ff7cbdd3b36bda27f450a4ee3f713426"
 
 [[package]]
 name = "bumpalo"
-version = "3.4.0"
+version = "3.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2e8c087f005730276d1096a652e92a8bacee2e2472bcc9715a74d2bec38b5820"
+checksum = "f07aa6688c702439a1be0307b6a94dffe1168569e45b9500c1372bc580740d59"
 
 [[package]]
 name = "byteorder"
@@ -147,9 +147,9 @@ dependencies = [
 
 [[package]]
 name = "getrandom"
-version = "0.2.1"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4060f4657be78b8e766215b02b18a2e862d83745545de804638e2b545e81aee6"
+checksum = "c9495705279e7140bf035dde1f6e750c162df8b625267cd52cc44e0b156732c8"
 dependencies = [
  "cfg-if 1.0.0",
  "libc",
@@ -167,9 +167,9 @@ dependencies = [
 
 [[package]]
 name = "hermit-abi"
-version = "0.1.17"
+version = "0.1.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5aca5565f760fb5b220e499d72710ed156fdb74e631659e99377d9ebfbd13ae8"
+checksum = "322f4de77956e22ed0e5032c359a0f1273f1f7f0d79bfa3b8ffbc730d7fbcc5c"
 dependencies = [
  "libc",
 ]
@@ -463,15 +463,15 @@ checksum = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
 
 [[package]]
 name = "serde"
-version = "1.0.120"
+version = "1.0.121"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "166b2349061381baf54a58e4b13c89369feb0ef2eaa57198899e2312aac30aab"
+checksum = "6159e3c76cab06f6bc466244d43b35e77e9500cd685da87620addadc2a4c40b1"
 
 [[package]]
 name = "serde_derive"
-version = "1.0.120"
+version = "1.0.121"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0ca2a8cb5805ce9e3b95435e3765b7b553cecc762d938d409434338386cb5775"
+checksum = "f3fcab8778dc651bc65cfab2e4eb64996f3c912b74002fb379c94517e1f27c46"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -619,9 +619,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "1.0.58"
+version = "1.0.59"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cc60a3d73ea6594cd712d830cc1f0390fd71542d8c8cd24e70cc54cdfd5e05d5"
+checksum = "07cb8b1b4ebf86a89ee88cbd201b022b94138c623644d035185c84d3f41b7e66"
 dependencies = [
  "proc-macro2",
  "quote",

src/cloud.rs

@@ -26,7 +26,8 @@ use crate::{
     device::{Device, Type},
     error::Error,
     messages::{
-        AddrList, NodeInfo, PeerInfo, MESSAGE_TYPE_CLOSE, MESSAGE_TYPE_DATA, MESSAGE_TYPE_KEEPALIVE, MESSAGE_TYPE_NODE_INFO
+        AddrList, NodeInfo, PeerInfo, MESSAGE_TYPE_CLOSE, MESSAGE_TYPE_DATA, MESSAGE_TYPE_KEEPALIVE,
+        MESSAGE_TYPE_NODE_INFO
     },
     net::{mapped_addr, Socket},
     payload::Protocol,
@@ -35,7 +36,7 @@ use crate::{
     table::ClaimTable,
     traffic::TrafficStats,
     types::{Address, Mode, NodeId, Range, RangeList},
-    util::{addr_nice, resolve, CtrlC, Duration, MsgBuffer, StatsdMsg, Time, TimeSource}
+    util::{addr_nice, bytes_to_hex, resolve, CtrlC, Duration, MsgBuffer, StatsdMsg, Time, TimeSource}
 };
 
 pub type Hash = BuildHasherDefault<FnvHasher>;
@@ -125,6 +126,9 @@ impl<D: Device, P: Protocol, S: Socket, TS: TimeSource> GenericCloud<D, P, S, TS
                     info!("Auto-claiming {} due to interface address", range);
                     claims.push(range);
                 }
+                Err(Error::DeviceIo(_, e)) if e.kind() == io::ErrorKind::AddrNotAvailable => {
+                    info!("No address set on interface.")
+                }
                 Err(e) => error!("{}", e)
             }
         }
@@ -225,6 +229,7 @@ impl<D: Device, P: Protocol, S: Socket, TS: TimeSource> GenericCloud<D, P, S, TS
             self.own_addresses.push(pfw.get_internal_ip().into());
             self.own_addresses.push(pfw.get_external_ip().into());
         }
+        // TODO: detect address changes and call event
         Ok(())
     }
 
@@ -279,6 +284,13 @@ impl<D: Device, P: Protocol, S: Socket, TS: TimeSource> GenericCloud<D, P, S, TS
                 return Ok(())
             }
         }
+        if !addrs.is_empty() {
+            self.config.call_hook(
+                "peer_connecting",
+                vec![("PEER", format!("{:?}", addr_nice(addrs[0]))), ("IFNAME", self.device.ifname().to_owned())],
+                true
+            );
+        }
         // Send a message to each resolved address
         for a in addrs {
             // Ignore error this time
@@ -454,6 +466,7 @@ impl<D: Device, P: Protocol, S: Socket, TS: TimeSource> GenericCloud<D, P, S, TS
             self.next_stats_out = now + STATS_INTERVAL;
             self.traffic.period(Some(5));
         }
+        // TODO: every 5 minutes: EVENT periodic
         if let Some(peers) = self.beacon_serializer.get_cmd_results() {
             debug!("Loaded beacon with peers: {:?}", peers);
             for peer in peers {
@@ -628,6 +641,16 @@ impl<D: Device, P: Protocol, S: Socket, TS: TimeSource> GenericCloud<D, P, S, TS
 
     fn add_new_peer(&mut self, addr: SocketAddr, info: NodeInfo) -> Result<(), Error> {
         info!("Added peer {}", addr_nice(addr));
+        self.config.call_hook(
+            "peer_connected",
+            vec![
+                ("PEER", format!("{:?}", addr_nice(addr))),
+                ("IFNAME", self.device.ifname().to_owned()),
+                ("CLAIMS", info.claims.iter().map(|r| format!("{:?}", r)).collect::<Vec<String>>().join(" ")),
+                ("NODE_ID", bytes_to_hex(&info.node_id)),
+            ],
+            true
+        );
         if let Some(init) = self.pending_inits.remove(&addr) {
             self.peers.insert(addr, PeerData {
                 addrs: info.addrs.clone(),
@@ -645,9 +668,18 @@ impl<D: Device, P: Protocol, S: Socket, TS: TimeSource> GenericCloud<D, P, S, TS
     }
 
     fn remove_peer(&mut self, addr: SocketAddr) {
-        if let Some(_peer) = self.peers.remove(&addr) {
+        if let Some(peer) = self.peers.remove(&addr) {
             info!("Closing connection to {}", addr_nice(addr));
             self.table.remove_claims(addr);
+            self.config.call_hook(
+                "peer_disconnected",
+                vec![
+                    ("PEER", format!("{:?}", addr)),
+                    ("IFNAME", self.device.ifname().to_owned()),
+                    ("NODE_ID", bytes_to_hex(&peer.node_id)),
+                ],
+                true
+            );
         }
     }
 
@@ -761,6 +793,14 @@ impl<D: Device, P: Protocol, S: Socket, TS: TimeSource> GenericCloud<D, P, S, TS
                 let msg_result = init.handle_message(data);
                 match msg_result {
                     Ok(res) => {
+                        self.config.call_hook(
+                            "peer_connecting",
+                            vec![
+                                ("PEER", format!("{:?}", addr_nice(src))),
+                                ("IFNAME", self.device.ifname().to_owned()),
+                            ],
+                            true
+                        );
                         self.pending_inits.insert(src, init);
                         Ok(res)
                     }
@@ -800,6 +840,11 @@ impl<D: Device, P: Protocol, S: Socket, TS: TimeSource> GenericCloud<D, P, S, TS
                 debug!("Fatal crypto init error from {}: {}", src, e);
                 info!("Closing pending connection to {} due to error in crypto init", addr_nice(src));
                 self.pending_inits.remove(&src);
+                self.config.call_hook(
+                    "peer_disconnected",
+                    vec![("PEER", format!("{:?}", addr_nice(src))), ("IFNAME", self.device.ifname().to_owned())],
+                    true
+                );
             }
             Err(e @ Error::CryptoInit(_)) => {
                 debug!("Recoverable init error from {}: {}", src, e);
@@ -831,6 +876,7 @@ impl<D: Device, P: Protocol, S: Socket, TS: TimeSource> GenericCloud<D, P, S, TS
         let waiter = try_fail!(WaitImpl::new(&self.socket, &self.device, 1000), "Failed to setup poll: {}");
         let mut buffer = MsgBuffer::new(SPACE_BEFORE);
         let mut poll_error = false;
+        self.config.call_hook("vpn_started", vec![("IFNAME", self.device.ifname())], true);
         for evt in waiter {
             match evt {
                 WaitResult::Error(err) => {
@@ -856,6 +902,7 @@ impl<D: Device, P: Protocol, S: Socket, TS: TimeSource> GenericCloud<D, P, S, TS
             }
         }
         info!("Shutting down...");
+        self.config.call_hook("vpn_shutdown", vec![("IFNAME", self.device.ifname())], true);
         buffer.clear();
         self.broadcast_msg(MESSAGE_TYPE_CLOSE, &mut buffer).ok();
         if let Some(ref path) = self.config.beacon_store {

src/config.rs

@@ -4,19 +4,20 @@
 
 use super::{device::Type, types::Mode, util::Duration};
 pub use crate::crypto::Config as CryptoConfig;
-
+use crate::util::run_cmd;
 use std::{
     cmp::max,
-    net::{IpAddr, Ipv6Addr, SocketAddr}
+    collections::HashMap,
+    ffi::OsStr,
+    net::{IpAddr, Ipv6Addr, SocketAddr},
+    process::Command,
+    thread
 };
-use structopt::StructOpt;
+use structopt::{clap::Shell, StructOpt};
-use structopt::clap::Shell;
-
 
 pub const DEFAULT_PEER_TIMEOUT: u16 = 300;
 pub const DEFAULT_PORT: u16 = 3210;
 
-
 fn parse_listen(addr: &str) -> SocketAddr {
     if let Some(addr) = addr.strip_prefix("*:") {
         let port = try_fail!(addr.parse::<u16>(), "Invalid port: {}");
@@ -61,7 +62,9 @@ pub struct Config {
     pub statsd_server: Option<String>,
     pub statsd_prefix: Option<String>,
     pub user: Option<String>,
-    pub group: Option<String>
+    pub group: Option<String>,
+    pub hook: Option<String>,
+    pub hooks: HashMap<String, String>
 }
 
 impl Default for Config {
@@ -94,7 +97,9 @@ impl Default for Config {
             statsd_server: None,
             statsd_prefix: None,
             user: None,
-            group: None
+            group: None,
+            hook: None,
+            hooks: HashMap::new()
         }
     }
 }
@@ -199,6 +204,12 @@ impl Config {
         if !file.crypto.algorithms.is_empty() {
             self.crypto.algorithms = file.crypto.algorithms.clone();
         }
+        if let Some(val) = file.hook {
+            self.hook = Some(val)
+        }
+        for (k, v) in file.hooks {
+            self.hooks.insert(k, v);
+        }
     }
 
     pub fn merge_args(&mut self, mut args: Args) {
@@ -292,6 +303,16 @@ impl Config {
         if !args.algorithms.is_empty() {
             self.crypto.algorithms = args.algorithms.clone();
         }
+        for s in args.hook {
+            if s.contains(':') {
+                let pos = s.find(':').unwrap();
+                let name = &s[..pos];
+                let hook = &s[pos+1..];
+                self.hooks.insert(name.to_string(), hook.to_string());
+            } else {
+                self.hook = Some(s);
+            }
+        }
     }
 
     pub fn get_keepalive(&self) -> Duration {
@@ -300,8 +321,31 @@ impl Config {
             None => max(self.peer_timeout / 2 - 60, 1)
         }
     }
-}
 
+    pub fn call_hook(
+        &self, event: &'static str, envs: impl IntoIterator<Item = (&'static str, impl AsRef<OsStr>)>, detach: bool
+    ) {
+        let mut script = None;
+        if let Some(ref s) = self.hook {
+            script = Some(s);
+        }
+        if let Some(ref s) = self.hooks.get(event) {
+            script = Some(s);
+        }
+        if script.is_none() {
+            return
+        }
+        let script = script.unwrap();
+        let mut cmd = Command::new("sh");
+        cmd.arg("-c").arg(script).envs(envs).env("EVENT", event);
+        debug!("Running event script: {:?}", cmd);
+        if detach {
+            thread::spawn(move || run_cmd(cmd));
+        } else {
+            run_cmd(cmd)
+        }
+    }
+}
 
 #[derive(StructOpt, Debug, Default)]
 pub struct Args {
@@ -463,7 +507,11 @@ pub struct Args {
 
     /// Generate shell completions
     #[structopt(long)]
-    pub completion: Option<Shell>
+    pub completion: Option<Shell>,
+
+    /// Call script on event
+    #[structopt(long)]
+    pub hook: Vec<String>
 }
 
 #[derive(Serialize, Deserialize, Debug, PartialEq, Default)]
@@ -517,10 +565,11 @@ pub struct ConfigFile {
     pub stats_file: Option<String>,
     pub statsd: Option<ConfigFileStatsd>,
     pub user: Option<String>,
-    pub group: Option<String>
+    pub group: Option<String>,
+    pub hook: Option<String>,
+    pub hooks: HashMap<String, String>
 }
 
-
 #[test]
 fn config_file() {
     let config_file = "
@@ -587,7 +636,9 @@ statsd:
         statsd: Some(ConfigFileStatsd {
             server: Some("example.com:1234".to_string()),
             prefix: Some("prefix".to_string())
-        })
+        }),
+        hook: None,
+        hooks: HashMap::new()
     })
 }
 
@@ -621,9 +672,12 @@ fn default_config_as_default() {
         statsd_server: None,
         statsd_prefix: None,
         user: None,
-        group: None
+        group: None,
+        hook: None,
+        hooks: HashMap::new()
     };
-    let default_config_file = serde_yaml::from_str::<ConfigFile>(include_str!("../assets/example.net.disabled")).unwrap();
+    let default_config_file =
+        serde_yaml::from_str::<ConfigFile>(include_str!("../assets/example.net.disabled")).unwrap();
     default_config.merge_file(default_config_file);
     assert_eq!(default_config, Config::default());
 }
@@ -664,7 +718,9 @@ fn config_merge() {
         statsd: Some(ConfigFileStatsd {
             server: Some("example.com:1234".to_string()),
             prefix: Some("prefix".to_string())
-        })
+        }),
+        hook: None,
+        hooks: HashMap::new()
     });
     assert_eq!(config, Config {
         device_type: Type::Tun,
@@ -753,6 +809,8 @@ fn config_merge() {
         stats_file: Some("/var/log/vpncloud-mynet.stats".to_string()),
         statsd_server: Some("example.com:2345".to_string()),
         statsd_prefix: Some("prefix2".to_string()),
-        daemonize: true
+        daemonize: true,
+        hook: None,
+        hooks: HashMap::new()
     });
 }

src/device.rs

@@ -5,12 +5,12 @@
 use std::{
     cmp,
     collections::VecDeque,
+    convert::TryInto,
     fmt,
     fs::{self, File},
     io::{self, BufRead, BufReader, Cursor, Error as IoError, Read, Write},
     net::{Ipv4Addr, UdpSocket},
     os::unix::io::{AsRawFd, RawFd},
-    convert::TryInto,
     str,
     str::FromStr
 };
@@ -36,7 +36,7 @@ struct IfReq {
 impl IfReq {
     fn new(name: &str) -> Self {
         assert!(name.len() < libc::IF_NAMESIZE);
-        let mut ifr_name = [0 as u8; libc::IF_NAMESIZE];
+        let mut ifr_name = [0; libc::IF_NAMESIZE];
         ifr_name[..name.len()].clone_from_slice(name.as_bytes());
         Self { ifr_name, data: IfReqData { _dummy: [0; 24] } }
     }
@@ -329,7 +329,7 @@ impl Device for MockDevice {
     }
 
     fn ifname(&self) -> &str {
-        unimplemented!()
+        "mock0"
     }
 
     fn read(&mut self, buffer: &mut MsgBuffer) -> Result<(), Error> {

src/main.rs

@@ -140,6 +140,7 @@ fn setup_device(config: &Config) -> TunTapDevice {
         config.device_name
     );
     info!("Opened device {}", device.ifname());
+    config.call_hook("device_setup", vec![("IFNAME", device.ifname())], true);
     if let Err(err) = device.set_mtu(None) {
         error!("Error setting optimal MTU on {}: {}", device.ifname(), err);
     }
@@ -159,6 +160,7 @@ fn setup_device(config: &Config) -> TunTapDevice {
             warn!("Your networking configuration might be affected by a vulnerability (https://vpncloud.ddswd.de/docs/security/cve-2019-14899/), please change your rp_filter setting to 1 (currently {}).", val);
         }
     }
+    config.call_hook("device_configured", vec![("IFNAME", device.ifname())], true);
     device
 }
 

src/oldconfig.rs

@@ -1,5 +1,6 @@
 use super::{device::Type, types::Mode, util::Duration};
 use crate::config::{ConfigFile, ConfigFileBeacon, ConfigFileDevice, ConfigFileStatsd, CryptoConfig};
+use std::collections::HashMap;
 
 #[derive(Serialize, Deserialize, Debug, PartialEq, Clone, Copy)]
 pub enum OldCryptoMethod {
@@ -112,12 +113,11 @@ impl OldConfigFile {
             pid_file: self.pid_file,
             port_forwarding: self.port_forwarding,
             stats_file: self.stats_file,
-            statsd: Some(ConfigFileStatsd {
+            statsd: Some(ConfigFileStatsd { prefix: self.statsd_prefix, server: self.statsd_server }),
-                prefix: self.statsd_prefix,
-                server: self.statsd_server
-            }),
             switch_timeout: self.dst_timeout,
-            user: self.user
+            user: self.user,
+            hook: None,
+            hooks: HashMap::new()
         }
     }
-}
+}

src/util.rs

@@ -2,31 +2,31 @@
 // Copyright (C) 2015-2020  Dennis Schwerdel
 // This software is licensed under GPL-3 or newer (see LICENSE.md)
 
+use std::process::Command;
 use std::{
     fmt,
     net::{Ipv4Addr, SocketAddr, ToSocketAddrs, UdpSocket},
-    sync::atomic::{AtomicIsize, Ordering}
+    sync::atomic::{AtomicIsize, Ordering},
 };
 
 use crate::error::Error;
 
-#[cfg(not(target_os = "linux"))] use time;
+#[cfg(not(target_os = "linux"))]
+use time;
 
 use signal::{trap::Trap, Signal};
 use smallvec::SmallVec;
 use std::time::Instant;
 
-
 pub type Duration = u32;
 pub type Time = i64;
 
-
 #[derive(Clone)]
 pub struct MsgBuffer {
     space_before: usize,
     buffer: [u8; 65535],
     start: usize,
-    end: usize
+    end: usize,
 }
 
 impl MsgBuffer {
@@ -98,7 +98,6 @@ impl MsgBuffer {
     }
 }
 
-
 const HEX_CHARS: &[u8] = b"0123456789abcdef";
 
 pub fn bytes_to_hex(bytes: &[u8]) -> String {
@@ -113,13 +112,12 @@ pub fn bytes_to_hex(bytes: &[u8]) -> String {
 pub fn addr_nice(addr: SocketAddr) -> SocketAddr {
     if let SocketAddr::V6(v6addr) = addr {
         if let Some(ip) = v6addr.ip().to_ipv4() {
-            return (ip, addr.port()).into()
+            return (ip, addr.port()).into();
         }
     }
     addr
 }
 
-
 pub struct Encoder;
 
 impl Encoder {
@@ -172,7 +170,6 @@ impl Encoder {
     }
 }
 
-
 macro_rules! fail {
     ($format:expr) => ( {
         use std::process;
@@ -215,17 +212,14 @@ pub fn get_internal_ip() -> Ipv4Addr {
     }
 }
 
-
 #[allow(unknown_lints, clippy::needless_pass_by_value)]
 pub fn resolve<Addr: ToSocketAddrs + fmt::Debug>(addr: Addr) -> Result<SmallVec<[SocketAddr; 4]>, Error> {
     let mut addrs =
         addr.to_socket_addrs().map_err(|_| Error::NameUnresolvable(format!("{:?}", addr)))?.collect::<SmallVec<_>>();
     // Try IPv4 first as it usually is faster
-    addrs.sort_by_key(|addr| {
+    addrs.sort_by_key(|addr| match *addr {
-        match *addr {
+        SocketAddr::V4(_) => 4,
-            SocketAddr::V4(_) => 4,
+        SocketAddr::V6(_) => 6,
-            SocketAddr::V6(_) => 6
-        }
     });
     // Remove duplicates in addrs (why are there duplicates???)
     addrs.dedup();
@@ -239,7 +233,6 @@ macro_rules! addr {
     }};
 }
 
-
 pub struct Bytes(pub u64);
 
 impl fmt::Display for Bytes {
@@ -248,31 +241,30 @@ impl fmt::Display for Bytes {
         if size >= 512.0 {
             size /= 1024.0;
         } else {
-            return write!(formatter, "{:.0} B", size)
+            return write!(formatter, "{:.0} B", size);
         }
         if size >= 512.0 {
             size /= 1024.0;
         } else {
-            return write!(formatter, "{:.1} KiB", size)
+            return write!(formatter, "{:.1} KiB", size);
         }
         if size >= 512.0 {
             size /= 1024.0;
         } else {
-            return write!(formatter, "{:.1} MiB", size)
+            return write!(formatter, "{:.1} MiB", size);
         }
         if size >= 512.0 {
             size /= 1024.0;
         } else {
-            return write!(formatter, "{:.1} GiB", size)
+            return write!(formatter, "{:.1} GiB", size);
         }
         write!(formatter, "{:.1} TiB", size)
     }
 }
 
-
 pub struct CtrlC {
     dummy_time: Instant,
-    trap: Trap
+    trap: Trap,
 }
 
 impl CtrlC {
@@ -293,7 +285,6 @@ impl Default for CtrlC {
     }
 }
 
-
 pub trait TimeSource: Sync + Copy + Send + 'static {
     fn now() -> Time;
 }
@@ -336,7 +327,6 @@ 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;
@@ -356,7 +346,7 @@ fn base62_add_mult_16(buf: &mut [u8], mut buflen: usize, m: u8) -> usize {
 const BASE62: [char; 62] = [
     '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
     'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
-    'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'
+    'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
 ];
 
 pub fn to_base62(data: &[u8]) -> String {
@@ -382,7 +372,7 @@ pub fn from_base62(data: &str) -> Result<Vec<u8>, char> {
             '0'..='9' => ((c as usize) % ('0' as usize)),
             'A'..='Z' => ((c as usize) % ('A' as usize)) + 10,
             'a'..='z' => ((c as usize) % ('a' as usize)) + 36,
-            _ => return Err(c)
+            _ => return Err(c),
         };
         for item in &mut buf {
             val += *item as usize * 62;
@@ -397,11 +387,10 @@ pub fn from_base62(data: &str) -> Result<Vec<u8>, char> {
     Ok(buf)
 }
 
-
 #[derive(Default)]
 pub struct StatsdMsg {
     entries: Vec<String>,
-    key: Vec<String>
+    key: Vec<String>,
 }
 
 impl StatsdMsg {
@@ -426,6 +415,16 @@ impl StatsdMsg {
     }
 }
 
+pub fn run_cmd(mut cmd: Command) {
+    match cmd.status() {
+        Ok(status) => {
+            if !status.success() {
+                error!("Command returned error: {:?}", status.code())
+            }
+        }
+        Err(e) => error!("Failed to execute command {:?}: {}", cmd, e),
+    }
+}
 
 #[test]
 fn base62() {