From 5d006c389c29bdb33eb16ced3989d30b81a97bc5 Mon Sep 17 00:00:00 2001
From: Dennis Schwerdel <schwerdel@informatik.uni-kl.de>
Date: Tue, 24 Nov 2015 11:19:27 +0100
Subject: [PATCH] --version

---
 src/main.rs       | 11 ++++++++++-
 src/udpmessage.rs |  2 +-
 src/usage.txt     |  1 +
 vpncloud.md       |  4 ++++
 4 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 4ee58b1..9b9945e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -27,6 +27,7 @@ use ethernet::SwitchTable;
 use ip::RoutingTable;
 use types::{Error, Mode, Type, Range, Table};
 use cloud::{TapCloud, TunCloud};
+use udpmessage::VERSION;
 #[cfg(feature = "crypto")] pub use crypto::Crypto;
 #[cfg(not(feature = "crypto"))] pub use no_crypto::Crypto;
 
@@ -65,7 +66,8 @@ struct Args {
     flag_verbose: bool,
     flag_quiet: bool,
     flag_ifup: Option<String>,
-    flag_ifdown: Option<String>
+    flag_ifdown: Option<String>,
+    flag_version: bool
 }
 
 fn run_script(script: String, ifname: &str) {
@@ -83,6 +85,13 @@ fn run_script(script: String, ifname: &str) {
 
 fn main() {
     let args: Args = Docopt::new(USAGE).and_then(|d| d.decode()).unwrap_or_else(|e| e.exit());
+    if args.flag_version {
+        println!("VpnCloud v{} ({}, protocol version {})", env!("CARGO_PKG_VERSION"),
+            if cfg!(feature = "crypto") { "with crypto support" } else { "without crypto support" },
+            VERSION
+        );
+        return;
+    }
     log::set_logger(|max_log_level| {
         assert!(!args.flag_verbose || !args.flag_quiet);
         if args.flag_verbose {
diff --git a/src/udpmessage.rs b/src/udpmessage.rs
index 0c65a40..1598304 100644
--- a/src/udpmessage.rs
+++ b/src/udpmessage.rs
@@ -7,7 +7,7 @@ use super::util::{as_obj, as_bytes, to_vec};
 use super::Crypto;
 
 const MAGIC: [u8; 3] = [0x76, 0x70, 0x6e];
-const VERSION: u8 = 1;
+pub const VERSION: u8 = 1;
 
 #[repr(packed)]
 struct TopHeader {
diff --git a/src/usage.txt b/src/usage.txt
index 870ccfb..115eb34 100644
--- a/src/usage.txt
+++ b/src/usage.txt
@@ -23,3 +23,4 @@ Options:
     -v, --verbose                   Print debug information.
     -q, --quiet                     Only print errors and warnings.
     -h, --help                      Display the help.
+    -V, --version                   Print the version and exit.
diff --git a/vpncloud.md b/vpncloud.md
index 3964e4c..3051f82 100644
--- a/vpncloud.md
+++ b/vpncloud.md
@@ -92,6 +92,10 @@ vpncloud(1) -- Peer-to-peer VPN
 
     Display the help.
 
+  * `-V`, `--version`:
+
+    Print the version and exit.
+
 
 ## DESCRIPTION