Ifup & ifdown scripts

src/cloud.rs

@@ -131,6 +131,10 @@ impl<P: Protocol> GenericCloud<P> {
         }
     }
 
+    pub fn ifname(&self) -> &str {
+        self.device.ifname()
+    }
+
     fn send_msg<Addr: ToSocketAddrs+fmt::Display>(&mut self, addr: Addr, msg: &Message) -> Result<(), Error> {
         debug!("Sending {:?} to {}", msg, addr);
         let size = encode(&mut self.options, msg, &mut self.buffer_out, &mut self.crypto);

src/main.rs

@@ -20,6 +20,7 @@ use docopt::Docopt;
 
 use std::hash::{Hash, SipHasher, Hasher};
 use std::str::FromStr;
+use std::process::Command;
 
 use device::Device;
 use ethernet::SwitchTable;
@@ -62,7 +63,22 @@ struct Args {
     flag_peer_timeout: usize,
     flag_dst_timeout: usize,
     flag_verbose: bool,
-    flag_quiet: bool
+    flag_quiet: bool,
+    flag_ifup: Option<String>,
+    flag_ifdown: Option<String>
+}
+
+fn run_script(script: String, ifname: &str) {
+    let mut cmd = Command::new("sh");
+    cmd.arg("-c").arg(&script).env("IFNAME", ifname);
+    debug!("Running script: {:?}", cmd);
+    match cmd.status() {
+        Ok(status) => match status.success() {
+            true => (),
+            false => error!("Script returned with error: {:?}", status.code())
+        },
+        Err(e) => error!("Failed to execute script {:?}: {}", script, e)
+    }
 }
 
 fn main() {
@@ -108,16 +124,28 @@ fn main() {
     match args.flag_type {
         Type::Tap => {
             let mut cloud = TapCloud::new(device, args.flag_listen, network_id, table, peer_timeout, learning, broadcasting, ranges, crypto);
+            if let Some(script) = args.flag_ifup {
+                run_script(script, cloud.ifname());
+            }
             for addr in &args.flag_connect {
                 cloud.connect(&addr as &str, true).expect("Failed to send");
             }
-            cloud.run()
+            cloud.run();
+            if let Some(script) = args.flag_ifdown {
+                run_script(script, cloud.ifname());
+            }
         },
         Type::Tun => {
             let mut cloud = TunCloud::new(device, args.flag_listen, network_id, table, peer_timeout, learning, broadcasting, ranges, crypto);
+            if let Some(script) = args.flag_ifup {
+                run_script(script, cloud.ifname());
+            }
             for addr in &args.flag_connect {
                 cloud.connect(&addr as &str, true).expect("Failed to send");
             }
+            if let Some(script) = args.flag_ifdown {
+                run_script(script, cloud.ifname());
+            }
             cloud.run()
         }
     };

src/usage.txt

@@ -17,6 +17,9 @@ Options:
     --peer-timeout <timeout>        Peer timeout in seconds. [default: 1800]
     --dst-timeout <timeout>         Switch table entry timeout in seconds.
                                     [default: 300]
+    --ifup <command>                A command to setup the network interface.
+    --ifdown <command>              A command to bring down the network
+                                    interface.
     -v, --verbose                   Print debug information.
     -q, --quiet                     Only print errors and warnings.
     -h, --help                      Display the help.

vpncloud.md

@@ -65,6 +65,20 @@ vpncloud(1) -- Peer-to-peer VPN
     mode. Addresses that have not been seen for the given period of time  will
     be forgot. [default: 300]
 
+  * `--ifup <command>`:
+
+    A command to setup the network interface. The command will be run (as
+    parameter to `sh -c`) when the device has been created to configure it.
+    The name of the allocated device will be available via the environment
+    variable `IFNAME`.
+
+  * `--ifdown <command>`:
+
+    A command to bring down the network interface. The command will be run (as
+    parameter to `sh -c`) to remove any configuration from the device.
+    The name of the allocated device will be available via the environment
+    variable `IFNAME`.
+
   * `-v`, `--verbose`:
 
     Print debug information, including information for data being received and
@@ -138,15 +152,10 @@ In the example scenario, a simple layer 2 network tunnel is established. Most
 likely those commands need to be run as **root** using `sudo`.
 
 First, VpnCloud need to be started on both nodes (the address after `-c` is the
-address of the remote node):
+address of the remote node and the the `X` in the interface address must be
+unique among all nodes, e.g. 0, 1, 2, ...):
 ```
-vpncloud -c remote_node:3210
+vpncloud -c remote_node:3210 --ifup 'ifconfig $IFNAME 10.0.0.X/24 mtu 1400 up'
-```
-
-Then, the interfaces have to configured and activated (the `X` in the address
-must be unique among all nodes, e.g. 0, 1, 2, ...):
-```
-ifconfig vpncloud0 10.0.0.X/24 mtu 1400 up
 ```
 
 Afterwards, the interface can be used to communicate.
@@ -157,12 +166,9 @@ Afterwards, the interface can be used to communicate.
 In this example, 4 nodes should communicate using IP. First, VpnCloud need to
 be started on both nodes:
 ```
-vpncloud -t tun -c remote_node:3210 --subnet 10.0.0.1/32
+vpncloud -t tun -c remote_node:3210 --subnet 10.0.0.X/32 --ifup 'ifconfig $IFNAME 10.0.0.0/24 mtu 1400 up'
 ```
 
-Then, the interfaces can be configured and activated like in the previous
-example.
-
 
 ### Important notes