WIP [CI SKIP]
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commit
fc494fe4c0
82
wg-event-gen/Cargo.lock
generated
82
wg-event-gen/Cargo.lock
generated
@ -48,6 +48,65 @@ dependencies = [
|
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"vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
|
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]
|
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|
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[[package]]
|
||||
name = "darling"
|
||||
version = "0.8.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
dependencies = [
|
||||
"darling_core 0.8.6 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"darling_macro 0.8.6 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
]
|
||||
|
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[[package]]
|
||||
name = "darling_core"
|
||||
version = "0.8.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
dependencies = [
|
||||
"fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"ident_case 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
|
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"syn 0.15.26 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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||||
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[[package]]
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name = "darling_macro"
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version = "0.8.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
|
||||
"darling_core 0.8.6 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"syn 0.15.26 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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|
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[[package]]
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name = "derive_builder"
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version = "0.7.1"
|
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
|
||||
"darling 0.8.6 (registry+https://github.com/rust-lang/crates.io-index)",
|
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"derive_builder_core 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
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"syn 0.15.26 (registry+https://github.com/rust-lang/crates.io-index)",
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||||
]
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||||
|
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[[package]]
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||||
name = "derive_builder_core"
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version = "0.4.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
|
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"darling 0.8.6 (registry+https://github.com/rust-lang/crates.io-index)",
|
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"proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
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"syn 0.15.26 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "fnv"
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version = "1.0.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "heck"
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version = "0.3.1"
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@ -61,6 +120,11 @@ name = "hex"
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version = "0.3.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "ident_case"
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version = "1.0.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "libc"
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version = "0.2.47"
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@ -68,7 +132,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "proc-macro2"
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version = "0.4.25"
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version = "0.4.27"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -79,7 +143,7 @@ name = "quote"
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version = "0.6.10"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"proc-macro2 0.4.25 (registry+https://github.com/rust-lang/crates.io-index)",
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"proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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@ -115,7 +179,7 @@ version = "0.2.14"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"heck 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
|
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"proc-macro2 0.4.25 (registry+https://github.com/rust-lang/crates.io-index)",
|
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"proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
|
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"quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
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"syn 0.15.26 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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@ -125,7 +189,7 @@ name = "syn"
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version = "0.15.26"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
|
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"proc-macro2 0.4.25 (registry+https://github.com/rust-lang/crates.io-index)",
|
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"proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
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"unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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@ -183,6 +247,7 @@ name = "wg-event-gen"
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version = "0.1.0"
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dependencies = [
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"base64 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
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"derive_builder 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
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"hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
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"structopt 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
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"structopt-derive 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -215,10 +280,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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"checksum bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "228047a76f468627ca71776ecdebd732a3423081fcf5125585bcd7c49886ce12"
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"checksum byteorder 1.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "94f88df23a25417badc922ab0f5716cc1330e87f71ddd9203b3a3ccd9cedf75d"
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"checksum clap 2.32.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b957d88f4b6a63b9d70d5f454ac8011819c6efa7727858f458ab71c756ce2d3e"
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"checksum darling 0.8.6 (registry+https://github.com/rust-lang/crates.io-index)" = "9158d690bc62a3a57c3e45b85e4d50de2008b39345592c64efd79345c7e24be0"
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"checksum darling_core 0.8.6 (registry+https://github.com/rust-lang/crates.io-index)" = "d2a368589465391e127e10c9e3a08efc8df66fd49b87dc8524c764bbe7f2ef82"
|
||||
"checksum darling_macro 0.8.6 (registry+https://github.com/rust-lang/crates.io-index)" = "244e8987bd4e174385240cde20a3657f607fb0797563c28255c353b5819a07b1"
|
||||
"checksum derive_builder 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)" = "a0ca533e6abb78f9108585535ce2ae0b14c8b4504e138a9a28eaf8ba2b270c1d"
|
||||
"checksum derive_builder_core 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "fb484fe06ba1dc5b82f88aff700191dfc127e02b06b35e302c169706168e2528"
|
||||
"checksum fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "2fad85553e09a6f881f739c29f0b00b0f01357c743266d478b68951ce23285f3"
|
||||
"checksum heck 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "20564e78d53d2bb135c343b3f47714a56af2061f1c928fdb541dc7b9fdd94205"
|
||||
"checksum hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "805026a5d0141ffc30abb3be3173848ad46a1b1664fe632428479619a3644d77"
|
||||
"checksum ident_case 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
|
||||
"checksum libc 0.2.47 (registry+https://github.com/rust-lang/crates.io-index)" = "48450664a984b25d5b479554c29cc04e3150c97aa4c01da5604a2d4ed9151476"
|
||||
"checksum proc-macro2 0.4.25 (registry+https://github.com/rust-lang/crates.io-index)" = "d3797b7142c9aa74954e351fc089bbee7958cebbff6bf2815e7ffff0b19f547d"
|
||||
"checksum proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)" = "4d317f9caece796be1980837fd5cb3dfec5613ebdb04ad0956deea83ce168915"
|
||||
"checksum quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)" = "53fa22a1994bd0f9372d7a816207d8a2677ad0325b073f5c5332760f0fb62b5c"
|
||||
"checksum redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)" = "52ee9a534dc1301776eff45b4fa92d2c39b1d8c3d3357e6eb593e0d795506fc2"
|
||||
"checksum redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7e891cfe48e9100a70a3b6eb652fef28920c117d366339687bd5576160db0f76"
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@ -10,6 +10,7 @@ base64 = "0.10.0"
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time = "0.1.42"
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structopt = "0.2.14"
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structopt-derive = "0.2.14"
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derive_builder = "0.7.1"
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[profile.release]
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lto = true
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68
wg-event-gen/src/controller.rs
Normal file
68
wg-event-gen/src/controller.rs
Normal file
@ -0,0 +1,68 @@
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use crate::model::WireguardController;
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use std::os::unix::net::UnixStream;
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use std::path::PathBuf;
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pub struct Userspace(PathBuf);
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impl Userspace {
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pub fn new<P: Into<PathBuf>>(path: P) -> Userspace {
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Userspace(path.into())
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}
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}
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impl WireguardController for Userspace {
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fn peers<'a>(&'a mut self) -> Box<Iterator<Item = Result<Peer>> + 'a> {
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let mut stream = UnixStream::connect(&self.0)?;
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stream.write_all(b"get=1\n")?;
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fn build_peer(builder: &mut PeerBuilder, line: String) -> Result<()> {
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let line = line?;
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let mut iter = line.chars();
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let key = iter.by_ref().take_while(|c| c != &'=').collect::<String>();
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let value = iter.collect::<String>();
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let mut allowed_ips: Vec<(IpAddr, u8)> = Vec::new();
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let mut last_handshake: Option<Duration> = None;
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let update_handshake = |d: Duration| {
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last_handshake = last_handshake.map(|c| c + d);
|
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};
|
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match key.as_ref() {
|
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"public_key" => builder.key(ECCKey::from_base64(value)?),
|
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"private_key" => builder.key(ECCKey::from_base64(value)?),
|
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"endpoint" => builder.endpoint(value::parse::<SocketAddr>()?),
|
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"last_handshake_time_sec" => {
|
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update_handshake(Duration::from_secs(value::parse::<usize>().into()))
|
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}
|
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"last_handshake_time_nsec" => {
|
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update_handshake(Duration::from_nsecs(value::parse::<usize>().into()))
|
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}
|
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"persistent_keepalive" => {
|
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builder.keepalive(Duration::from_secs(value::parse::<usize>().into()))
|
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}
|
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"allowed_ip" => {
|
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let mut parts = value.split("/").into_iter();
|
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let ip = match (
|
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parts.next().and_then(|addr| addr.parse::<IpAddr>().ok()),
|
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parts.next().and_then(|mask| mask.parse::<u8>().ok()),
|
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) {
|
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(Some(addr), Some(mask)) => Some((addr, mask)),
|
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(Some(addr), None) if addr.is_ipv6() => Some((addr, 128)),
|
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(Some(addr), None) => Some((addr, 32)),
|
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_ => None,
|
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};
|
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ips.push(ip);
|
||||
}
|
||||
}
|
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builder.allowed_ips(ips);
|
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builder.last_handshake(last_handshake);
|
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}
|
||||
|
||||
let peers = BufReader::new(stream)
|
||||
.lines()
|
||||
.scan(PeerBuilder::default(), build_peer);
|
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loop {}
|
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}
|
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|
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fn update_peer(&mut self, peer: &Peer) -> Result<()> {
|
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loop {}
|
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}
|
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}
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@ -1,258 +1,7 @@
|
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#[macro_use]
|
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extern crate structopt;
|
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mod controller;
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|
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mod gen;
|
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mod listener;
|
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mod opts;
|
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|
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use listener::*;
|
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|
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use base64;
|
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use hex;
|
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use opts::Opts;
|
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use std::collections::HashMap;
|
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use std::env;
|
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use std::fmt;
|
||||
use std::io::prelude::*;
|
||||
use std::io::{BufRead, BufReader, Error, ErrorKind, Result};
|
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use std::net::{IpAddr, SocketAddr};
|
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use std::os::unix::net::UnixStream;
|
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use std::path::PathBuf;
|
||||
use std::process::exit;
|
||||
use std::thread;
|
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use std::time::Duration;
|
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use structopt::StructOpt;
|
||||
|
||||
use time;
|
||||
|
||||
pub type KV = (String, String);
|
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|
||||
#[derive(Debug, PartialEq, Eq, Hash)]
|
||||
enum State {
|
||||
Interface(Vec<KV>),
|
||||
Peer(Vec<KV>),
|
||||
}
|
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|
||||
#[derive(Debug, PartialEq, Eq, Hash, Clone)]
|
||||
pub struct Peer {
|
||||
public_key: String,
|
||||
endpoint: Option<SocketAddr>,
|
||||
allowed_ips: Vec<(IpAddr, u8)>,
|
||||
last_handshake: Option<Duration>,
|
||||
persistent_keepalive: Option<Duration>,
|
||||
traffic: (u64, u64),
|
||||
parsed: time::Timespec,
|
||||
}
|
||||
|
||||
impl Peer {
|
||||
fn from_kv(entries: &Vec<KV>) -> Result<Peer> {
|
||||
let key = match entries
|
||||
.iter()
|
||||
.filter(|(key, _)| key == &"public_key")
|
||||
.map(|(_, value)| value)
|
||||
.next()
|
||||
{
|
||||
Some(key) => key,
|
||||
None => return Err(Error::new(ErrorKind::Other, "Peer is missing key")),
|
||||
};
|
||||
Ok(Peer {
|
||||
public_key: base64::encode(&hex::decode(key).unwrap()),
|
||||
endpoint: entries
|
||||
.iter()
|
||||
.filter(|(key, _)| key == &"endpoint")
|
||||
.map(|(_, value)| value.parse::<SocketAddr>().unwrap())
|
||||
.next(),
|
||||
allowed_ips: entries
|
||||
.iter()
|
||||
.filter(|(key, _)| key == &"allowed_ip")
|
||||
.map(|(_, value)| {
|
||||
let mut parts = value.split("/").into_iter();
|
||||
match (
|
||||
parts.next().and_then(|addr| addr.parse::<IpAddr>().ok()),
|
||||
parts.next().and_then(|mask| mask.parse::<u8>().ok()),
|
||||
) {
|
||||
(Some(addr), Some(mask)) => Some((addr, mask)),
|
||||
(Some(addr), None) if addr.is_ipv6() => Some((addr, 128)),
|
||||
(Some(addr), None) => Some((addr, 32)),
|
||||
_ => None,
|
||||
}
|
||||
})
|
||||
.filter_map(|net| net)
|
||||
.collect::<Vec<(IpAddr, u8)>>(),
|
||||
last_handshake: entries
|
||||
.iter()
|
||||
.filter_map(|(key, value)| {
|
||||
let value = || value.parse::<u64>().unwrap();
|
||||
match key.as_ref() {
|
||||
"last_handshake_time_sec" if value() != 0 => {
|
||||
Some(Duration::new(value(), 0))
|
||||
}
|
||||
"last_handshake_time_nsec" if value() != 0 => {
|
||||
Some(Duration::from_nanos(value()))
|
||||
}
|
||||
_ => None,
|
||||
}
|
||||
})
|
||||
.fold(None, |acc, add| {
|
||||
if let Some(dur) = acc {
|
||||
Some(dur + add)
|
||||
} else {
|
||||
Some(add)
|
||||
}
|
||||
}),
|
||||
persistent_keepalive: entries
|
||||
.iter()
|
||||
.filter(|(key, _)| key == &"persistent_keepalive")
|
||||
.map(|(_, value)| Duration::from_secs(value.parse::<u64>().unwrap()))
|
||||
.next(),
|
||||
traffic: (0, 0),
|
||||
parsed: time::get_time(),
|
||||
})
|
||||
}
|
||||
|
||||
pub fn last_handshake_rel(&self) -> Option<Duration> {
|
||||
let time = self.parsed;
|
||||
Some(Duration::new(time.sec as u64, time.nsec as u32) - self.last_handshake?)
|
||||
}
|
||||
}
|
||||
|
||||
impl State {
|
||||
pub fn kv(&self) -> &Vec<KV> {
|
||||
match self {
|
||||
State::Interface(kv) => kv,
|
||||
State::Peer(kv) => kv,
|
||||
}
|
||||
}
|
||||
|
||||
fn kv_mut(&mut self) -> &mut Vec<KV> {
|
||||
match self {
|
||||
State::Interface(kv) => kv,
|
||||
State::Peer(kv) => kv,
|
||||
}
|
||||
}
|
||||
|
||||
pub fn id<'a>(&'a self) -> Option<String> {
|
||||
self.kv()
|
||||
.iter()
|
||||
.filter(|(key, _)| key == &"private_key" || key == &"public_key")
|
||||
.map(|(_, value)| base64::encode(&hex::decode(&value).unwrap()))
|
||||
.next()
|
||||
}
|
||||
|
||||
pub fn push(&mut self, key: String, value: String) {
|
||||
self.kv_mut().push((key, value));
|
||||
}
|
||||
}
|
||||
|
||||
impl fmt::Display for State {
|
||||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
for (k, v) in self.kv() {
|
||||
write!(f, "({:10}= {})", k, v)?;
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
impl fmt::Display for Peer {
|
||||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
write!(f, "{:?}", self)
|
||||
// write!(f, "peer {}\nshake {} ago\naddr {}\nkeepalive {}\n", self.public_key, self.last_handshake.map(|d|d.to_string()).unwrap_or("-"), self.endpoint.map(|d|d.to_string()).unwrap_or("-"), self.persistent_keepalive.map(|d|d.to_string()).unwrap_or("-"))
|
||||
}
|
||||
}
|
||||
|
||||
struct Socket {
|
||||
pub path: PathBuf,
|
||||
}
|
||||
|
||||
impl Socket {
|
||||
pub fn get(&self) -> Result<Vec<State>> {
|
||||
let mut stream = UnixStream::connect(&self.path)?;
|
||||
stream.write_all(b"get=1\n")?;
|
||||
let mut state: Vec<State> = vec![];
|
||||
let mut cur = State::Interface(Vec::with_capacity(0));
|
||||
for line in BufReader::new(stream).lines() {
|
||||
let line = line?;
|
||||
let mut iter = line.chars();
|
||||
let key = iter.by_ref().take_while(|c| c != &'=').collect::<String>();
|
||||
let value = iter.collect::<String>();
|
||||
match key.as_ref() {
|
||||
"errno" if value != "0" => {
|
||||
Err(Error::new(
|
||||
ErrorKind::Other,
|
||||
format!("Socket said error: {}", value),
|
||||
))?;
|
||||
break;
|
||||
}
|
||||
"public_key" | "private_key" => {
|
||||
state.push(cur);
|
||||
cur = if key == "private_key" {
|
||||
State::Interface(Vec::with_capacity(3))
|
||||
} else {
|
||||
State::Peer(Vec::with_capacity(5))
|
||||
};
|
||||
cur.push(key, value);
|
||||
}
|
||||
_ => cur.push(key, value),
|
||||
}
|
||||
}
|
||||
Ok(state)
|
||||
}
|
||||
|
||||
pub fn get_by_id(&self) -> Result<HashMap<String, State>> {
|
||||
let state = self.get()?;
|
||||
let mut ided = HashMap::new();
|
||||
for s in state {
|
||||
if let Some(id) = s.id() {
|
||||
ided.insert(id.clone(), s);
|
||||
}
|
||||
}
|
||||
Ok(ided)
|
||||
}
|
||||
|
||||
pub fn get_peers(&self) -> Result<HashMap<String, Peer>> {
|
||||
let by_id = self.get_by_id()?;
|
||||
Ok(by_id
|
||||
.iter()
|
||||
.filter_map(|(id, state)| {
|
||||
Peer::from_kv(state.kv())
|
||||
.ok()
|
||||
.map(|peer| (id.to_owned(), peer))
|
||||
})
|
||||
.collect())
|
||||
}
|
||||
}
|
||||
use controller::Userspace;
|
||||
|
||||
fn main() {
|
||||
let opts = Opts::from_args();
|
||||
|
||||
let timeout = Duration::from_secs(opts.timeout);
|
||||
let interval = Duration::from_secs(opts.poll);
|
||||
let events = opts.events;
|
||||
let path = opts.socket;
|
||||
|
||||
let mut listeners: Vec<Box<EventListener>> = vec![Box::new(LogListener)];
|
||||
|
||||
if let Some(events) = events {
|
||||
listeners.push(Box::new(ScriptListener::new(events)))
|
||||
}
|
||||
|
||||
let sock = Socket { path };
|
||||
let mut prev_state: Option<HashMap<String, Peer>> = None;
|
||||
loop {
|
||||
let state = match sock.get_peers() {
|
||||
Ok(state) => state,
|
||||
Err(err) => {
|
||||
eprintln!("Failed to read from socket: {}", err);
|
||||
if !opts.ignore_socket_errors {
|
||||
exit(1);
|
||||
}
|
||||
continue;
|
||||
}
|
||||
};
|
||||
if let Some(prev_state) = prev_state {
|
||||
gen::gen_events(&state, &prev_state, &listeners, timeout, interval);
|
||||
}
|
||||
prev_state = Some(state);
|
||||
thread::sleep(interval);
|
||||
}
|
||||
let controller = Userspace::new("");
|
||||
}
|
||||
|
||||
47
wg-event-gen/src/model.rs
Normal file
47
wg-event-gen/src/model.rs
Normal file
@ -0,0 +1,47 @@
|
||||
#[macro_use]
|
||||
extern crate structopt;
|
||||
|
||||
|
||||
#[macro_use]
|
||||
extern crate derive_builder;
|
||||
|
||||
|
||||
use std::io::Result;
|
||||
use base64::{decode};
|
||||
|
||||
pub enum ECCKey{
|
||||
PublicKey([u8; 32]),
|
||||
PrivateKey([u8; 32])
|
||||
}
|
||||
|
||||
impl ECCKey {
|
||||
fn from_base64<I: AsRef<str>>(key: I) -> Result<ECCKey> {
|
||||
let key = decode(key.as_ref::<str>())?;
|
||||
let bytes = [0; 32];
|
||||
bytes.copy_from_slice(key);
|
||||
ECCKey::PublicKey(bytes)
|
||||
}
|
||||
}
|
||||
|
||||
struct SharedKey([u8; 32]);
|
||||
|
||||
#[derive(Debug,Builder, PartialEq, Eq, Hash, Clone)]
|
||||
pub struct Peer {
|
||||
key: ECCKey,
|
||||
shared_key: Option<SharedKey>,
|
||||
endpoint: Option<SocketAddr>,
|
||||
allowed_ips: Vec<(IpAddr, u8)>,
|
||||
last_handshake: Option<Duration>,
|
||||
persistent_keepalive: Option<Duration>,
|
||||
traffic: (u64, u64),
|
||||
parsed: time::Timespec,
|
||||
}
|
||||
|
||||
|
||||
trait WireguardController {
|
||||
|
||||
fn peers<'a>(&'a mut self) -> Box<Iterator<Item=Result<Peer>> + 'a>;
|
||||
|
||||
fn update_peer(&mut self, peer: &Peer) -> Result<()>;
|
||||
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user