Merge pull request 'woodpecker CI' (#23) from woodpecker-ci into main

Reviewed-on: Deuxfleurs/diplonat#23

.drone.yml

@@ -1,24 +0,0 @@
----
-kind: pipeline
-name: default
-
-workspace:
-  base: /drone/diplonat
-
-steps: 
-- name: code style
-  image: rust:1.47
-  commands:
-  - rustup component add rustfmt
-  - cargo fmt --all -- --check
-# - name: code quality
-#   image: rust:1.47
-#   commands:
-#   - cargo clippy -- --deny warnings
-# - name: test
-#   image: rust:1.47
-#   commands:
-#   - cargo build --verbose --all
-#   - cargo test --verbose --all
-
-  

.gitignore

@@ -1,3 +1,5 @@
-target/
+target
+result
+result-bin
 *.swp
 .env

.rustfmt.toml

@@ -1,2 +0,0 @@
-hard_tabs = false
-tab_spaces = 2

.woodpecker.yml

@@ -0,0 +1,26 @@
+when:
+  event:
+  - push
+  - pull_request
+  - tag
+  - cron
+  - manual
+
+steps:
+  - name: check formatting
+    image: nixpkgs/nix:nixos-22.05
+    environment:
+      NIX_PATH: 'nixpkgs=channel:nixos-22.05'
+    commands:
+      - nix-shell -p cargo -p rustfmt --run 'cargo fmt -- --check'
+
+  - name: build
+    image: nixpkgs/nix:nixos-22.05
+    commands:
+      - nix build --extra-experimental-features nix-command --extra-experimental-features flakes .#debug.x86_64-linux.diplonat
+
+  - name: test
+    image: nixpkgs/nix:nixos-22.05
+    commands:
+      - nix build --extra-experimental-features nix-command --extra-experimental-features flakes .#test.x86_64-linux.diplonat
+      - ./result-bin/bin/diplonat-*

CONTRIBUTING.md

@@ -8,12 +8,13 @@
 
 #### Installing rustfmt
 
-You can run `rustfmt` with Rust 1.24 and above.
+You must install a very recent version of `rustfmt` through rust nightly
 
 To install: 
 
 ```
-rustup component add rustfmt
+rustup toolchain install nightly-x86_64-unknown-linux-gnu
+rustup component add rustfmt --toolchain nightly
 ```
 
 #### Usage 
@@ -21,14 +22,24 @@ rustup component add rustfmt
 To run on Diplonat, launch the following in the root directory:
 
 ```
-cargo fmt --all
+cargo +nightly fmt
 ``` 
 
-This will format the whole repository using the settigs defined in [`.rustfmt.toml`](./.rustfmt.toml): soft tabs of 2 spaces.
+This will format the whole repository using the settigs defined in [`.rustfmt.toml`](./.rustfmt.toml).
 
 #### Auto-format code
 
 You can automate formatting in a number of ways:
 
-* [Setup your IDE to use `rustfmt`](https://github.com/rust-lang/rustfmt#running-rustfmt-from-your-editor).
-* Setup a git hook to run `rustfmt` before each commit.
+[Setup your IDE to use `rustfmt`](https://github.com/rust-lang/rustfmt#running-rustfmt-from-your-editor).
+
+Setup a git hook to run `rustfmt` before each commit:
+
+```bash
+cat <<EOF > .git/hooks/pre-commit
+#!/bin/bash
+
+cargo +nightly fmt
+EOF
+chmod +x .git/hooks/pre-commit
+```

Cargo.toml

@@ -10,13 +10,15 @@ edition = "2018"
 anyhow = "1.0.28"
 envy = "0.4"
 futures = "0.3.5"
-igd = { version = "0.10.0", features = ["aio"] }
+get_if_addrs = "0.5"
+igd = { version = "0.12.0", features = ["aio"] }
 iptables = "0.2.2"
 log = "0.4"
 pretty_env_logger = "0.4"
 regex = "1"
-reqwest = { version = "0.10", features = ["json"] }
+reqwest = { version = "0.11", default-features = false, features = ["json", "rustls-tls-manual-roots" ] }
 serde = { version = "1.0.107", features = ["derive"] }
 serde-lexpr = "0.1.1"
 serde_json = "1.0.53"
-tokio = "0.2"
+tokio = { version = "1", features = ["sync", "rt-multi-thread", "net", "macros"] }
+stun-client = "0.1.2"

Dockerfile

@@ -1,7 +1,7 @@
-FROM debian:bullseye-slim as builder
+FROM rust:1.69-bullseye as builder
 
 RUN apt-get update && \
-    apt-get install -y rustc cargo libssl-dev pkg-config
+    apt-get install -y libssl-dev pkg-config
 
 WORKDIR /srv
 

LICENSE

@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
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+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
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+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
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+receiving the covered work authorizing them to use, propagate, modify
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+you grant is automatically extended to all recipients of the covered
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+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
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+in the business of distributing software, under which you make payment
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+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Remote Network Interaction; Use with the GNU General Public License.
+
+  Notwithstanding any other provision of this License, if you modify the
+Program, your modified version must prominently offer all users
+interacting with it remotely through a computer network (if your version
+supports such interaction) an opportunity to receive the Corresponding
+Source of your version by providing access to the Corresponding Source
+from a network server at no charge, through some standard or customary
+means of facilitating copying of software.  This Corresponding Source
+shall include the Corresponding Source for any work covered by version 3
+of the GNU General Public License that is incorporated pursuant to the
+following paragraph.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the work with which it is combined will remain governed by version
+3 of the GNU General Public License.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU Affero General Public License from time to time.  Such new versions
+will be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU Affero General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU Affero General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU Affero General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
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+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
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+  16. Limitation of Liability.
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+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
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+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
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+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.

README.md

@@ -1,6 +1,8 @@
 Diplonat
 ========
 
+[![status-badge](https://woodpecker.deuxfleurs.fr/api/badges/40/status.svg)](https://woodpecker.deuxfleurs.fr/repos/40)
+
 ## Feature set
 
  * [X] (Re)Configure NAT via UPNP/IGD (prio: high)  
@@ -86,3 +88,7 @@ consul services register -name=fake_dns  -tag="(diplonat (udp_port 53) (tcp_port
 consul services register -name=fake_irc  -tag="(diplonat (udp_port 6667 6666))"
 consul services -id=example
 ```
+
+## License
+
+This software is published under the AGPLv3 license.

flake.lock

@@ -0,0 +1,108 @@
+{
+  "nodes": {
+    "cargo2nix": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "flake-utils": "flake-utils",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "rust-overlay": "rust-overlay"
+      },
+      "locked": {
+        "lastModified": 1666087781,
+        "narHash": "sha256-trKVdjMZ8mNkGfLcY5LsJJGtdV3xJDZnMVrkFjErlcs=",
+        "owner": "Alexis211",
+        "repo": "cargo2nix",
+        "rev": "a7a61179b66054904ef6a195d8da736eaaa06c36",
+        "type": "github"
+      },
+      "original": {
+        "owner": "Alexis211",
+        "repo": "cargo2nix",
+        "rev": "a7a61179b66054904ef6a195d8da736eaaa06c36",
+        "type": "github"
+      }
+    },
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1650374568,
+        "narHash": "sha256-Z+s0J8/r907g149rllvwhb4pKi8Wam5ij0st8PwAh+E=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "b4a34015c698c7793d592d66adbab377907a2be8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1659877975,
+        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1665657542,
+        "narHash": "sha256-mojxNyzbvmp8NtVtxqiHGhRfjCALLfk9i/Uup68Y5q8=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "a3073c49bc0163fea6a121c276f526837672b555",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "a3073c49bc0163fea6a121c276f526837672b555",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "cargo2nix": "cargo2nix",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "flake-utils": [
+          "cargo2nix",
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "cargo2nix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1664247556,
+        "narHash": "sha256-J4vazHU3609ekn7dr+3wfqPo5WGlZVAgV7jfux352L0=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "524db9c9ea7bc7743bb74cdd45b6d46ea3fcc2ab",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,36 @@
+{
+  description = "A very basic flake";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/a3073c49bc0163fea6a121c276f526837672b555";
+  inputs.cargo2nix = {
+    # As of 2022-10-18: two small patches over unstable branch, one for clippy and one to fix feature detection
+    url = "github:Alexis211/cargo2nix/a7a61179b66054904ef6a195d8da736eaaa06c36";
+    inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = { self, nixpkgs, cargo2nix }:
+  let
+    pkgs = import nixpkgs {
+      system = "x86_64-linux";
+      overlays = [ cargo2nix.overlays.default ];
+    };
+    packageFun = import ./Cargo.nix;
+    rustVersion = "1.63.0";
+
+    compile = args: compileMode:
+      let
+        packageSet = pkgs.rustBuilder.makePackageSet ({
+          inherit packageFun rustVersion;
+        } // args);
+      in
+        packageSet.workspace.diplonat {
+          inherit compileMode;
+        };
+  in
+  {
+    test.x86_64-linux.diplonat = compile { release = false; } "test";
+    debug.x86_64-linux.diplonat = compile { release = false; } "build";
+    packages.x86_64-linux.diplonat = compile { release = true; } "build";
+    packages.x86_64-linux.default = self.packages.x86_64-linux.diplonat;
+  };
+}

src/config/mod.rs

@@ -3,11 +3,12 @@ mod options;
 mod options_test;
 mod runtime;
 
-pub use options::{ConfigOpts, ConfigOptsAcme, ConfigOptsBase, ConfigOptsConsul};
+pub use options::{ConfigOpts, ConfigOptsBase, ConfigOptsConsul};
 pub use runtime::{
-  RuntimeConfig, RuntimeConfigAcme, RuntimeConfigConsul, RuntimeConfigFirewall, RuntimeConfigIgd,
+    RuntimeConfig, RuntimeConfigConsul, RuntimeConfigFirewall, RuntimeConfigIgd, RuntimeConfigStun,
 };
 
 pub const EXPIRATION_TIME: u16 = 300;
 pub const REFRESH_TIME: u16 = 60;
 pub const CONSUL_URL: &str = "http://127.0.0.1:8500";
+pub const STUN_SERVER: &str = "stun.nextcloud.com:443";

src/config/options.rs

@@ -11,68 +11,67 @@ use crate::config::RuntimeConfig;
 /// Base configuration options
 #[derive(Clone, Default, Deserialize)]
 pub struct ConfigOptsBase {
-  /// This node's private IP address [default: None]
-  pub private_ip: Option<String>,
-  /// Expiration time for IGD rules [default: 60]
-  pub expiration_time: Option<u16>,
-  /// Refresh time for IGD and Firewall rules [default: 300]
-  pub refresh_time: Option<u16>,
-}
-
-/// ACME configuration options
-#[derive(Clone, Default, Deserialize)]
-pub struct ConfigOptsAcme {
-  /// Whether ACME is enabled [default: false]
-  #[serde(default)]
-  pub enable: bool,
-
-  /// The default domain holder's e-mail [default: None]
-  pub email: Option<String>,
+    /// This node's private IP address [default: None]
+    pub private_ip: Option<String>,
+    /// Expiration time for IGD rules [default: 60]
+    pub expiration_time: Option<u16>,
+    /// Refresh time for IGD and Firewall rules [default: 300]
+    pub refresh_time: Option<u16>,
+    /// STUN server [default: stun.nextcloud.com:443]
+    pub stun_server: Option<String>,
+    /// IPv6-only mode (disables IGD, IPv4 firewall and IPv4 address autodiscovery) [default: false]
+    #[serde(default)]
+    pub ipv6_only: bool,
 }
 
 /// Consul configuration options
 #[derive(Clone, Default, Deserialize)]
 pub struct ConfigOptsConsul {
-  /// Consul's node name [default: None]
-  pub node_name: Option<String>,
-  /// Consul's REST URL [default: "http://127.0.0.1:8500"]
-  pub url: Option<String>,
+    /// Consul's node name [default: None]
+    pub node_name: Option<String>,
+    /// Consul's REST URL [default: "http://127.0.0.1:8500"]
+    pub url: Option<String>,
+    /// Consul's CA certificate [default: None]
+    pub ca_cert: Option<String>,
+    /// Skip TLS verification for Consul server [default: false]
+    #[serde(default)]
+    pub tls_skip_verify: bool,
+    /// Consul's client certificate [default: None]
+    pub client_cert: Option<String>,
+    /// Consul's client key [default: None]
+    pub client_key: Option<String>,
 }
 
 /// Model of all potential configuration options
 pub struct ConfigOpts {
-  pub base: ConfigOptsBase,
-  pub acme: ConfigOptsAcme,
-  pub consul: ConfigOptsConsul,
+    pub base: ConfigOptsBase,
+    pub consul: ConfigOptsConsul,
 }
 
 impl ConfigOpts {
-  pub fn from_env() -> Result<RuntimeConfig> {
-    let base: ConfigOptsBase = envy::prefixed("DIPLONAT_").from_env()?;
-    let consul: ConfigOptsConsul = envy::prefixed("DIPLONAT_CONSUL_").from_env()?;
-    let acme: ConfigOptsAcme = envy::prefixed("DIPLONAT_ACME_").from_env()?;
+    pub fn from_env() -> Result<RuntimeConfig> {
+        let base: ConfigOptsBase = envy::prefixed("DIPLONAT_").from_env()?;
+        let consul: ConfigOptsConsul = envy::prefixed("DIPLONAT_CONSUL_").from_env()?;
 
-    RuntimeConfig::new(Self {
-      base: base,
-      consul: consul,
-      acme: acme,
-    })
-  }
+        RuntimeConfig::new(Self {
+            base: base,
+            consul: consul,
+        })
+    }
 
-  // Currently only used in tests
-  #[allow(dead_code)]
-  pub fn from_iter<Iter: Clone>(iter: Iter) -> Result<RuntimeConfig>
-  where
-    Iter: IntoIterator<Item = (String, String)>,
-  {
-    let base: ConfigOptsBase = envy::prefixed("DIPLONAT_").from_iter(iter.clone())?;
-    let consul: ConfigOptsConsul = envy::prefixed("DIPLONAT_CONSUL_").from_iter(iter.clone())?;
-    let acme: ConfigOptsAcme = envy::prefixed("DIPLONAT_ACME_").from_iter(iter.clone())?;
+    // Currently only used in tests
+    #[cfg(test)]
+    pub fn from_iter<Iter: Clone>(iter: Iter) -> Result<RuntimeConfig>
+    where
+        Iter: IntoIterator<Item = (String, String)>,
+    {
+        let base: ConfigOptsBase = envy::prefixed("DIPLONAT_").from_iter(iter.clone())?;
+        let consul: ConfigOptsConsul =
+            envy::prefixed("DIPLONAT_CONSUL_").from_iter(iter.clone())?;
 
-    RuntimeConfig::new(Self {
-      base: base,
-      consul: consul,
-      acme: acme,
-    })
-  }
+        RuntimeConfig::new(Self {
+            base: base,
+            consul: consul,
+        })
+    }
 }

src/config/options_test.rs

@@ -1,5 +1,4 @@
-use std::collections::HashMap;
-use std::time::Duration;
+use std::{collections::HashMap, time::Duration};
 
 use crate::config::*;
 
@@ -10,120 +9,111 @@ use crate::config::*;
 // This is why we only test ConfigOpts::from_iter(iter).
 
 fn minimal_valid_options() -> HashMap<String, String> {
-  let mut opts = HashMap::new();
-  opts.insert(
-    "DIPLONAT_PRIVATE_IP".to_string(),
-    "172.123.43.555".to_string(),
-  );
-  opts.insert(
-    "DIPLONAT_CONSUL_NODE_NAME".to_string(),
-    "consul_node".to_string(),
-  );
-  opts
+    let mut opts = HashMap::new();
+    opts.insert(
+        "DIPLONAT_CONSUL_NODE_NAME".to_string(),
+        "consul_node".to_string(),
+    );
+    opts
 }
 
 fn all_valid_options() -> HashMap<String, String> {
-  let mut opts = minimal_valid_options();
-  opts.insert("DIPLONAT_EXPIRATION_TIME".to_string(), "30".to_string());
-  opts.insert("DIPLONAT_REFRESH_TIME".to_string(), "10".to_string());
-  opts.insert(
-    "DIPLONAT_CONSUL_URL".to_string(),
-    "http://127.0.0.1:9999".to_string(),
-  );
-  opts.insert("DIPLONAT_ACME_ENABLE".to_string(), "true".to_string());
-  opts.insert(
-    "DIPLONAT_ACME_EMAIL".to_string(),
-    "bozo@bozo.net".to_string(),
-  );
-  opts
+    let mut opts = minimal_valid_options();
+    opts.insert("DIPLONAT_EXPIRATION_TIME".to_string(), "30".to_string());
+    opts.insert(
+        "DIPLONAT_STUN_SERVER".to_string(),
+        "stun.nextcloud.com:443".to_string(),
+    );
+    opts.insert(
+        "DIPLONAT_PRIVATE_IP".to_string(),
+        "172.123.43.55".to_string(),
+    );
+    opts.insert("DIPLONAT_REFRESH_TIME".to_string(), "10".to_string());
+    opts.insert(
+        "DIPLONAT_CONSUL_URL".to_string(),
+        "http://127.0.0.1:9999".to_string(),
+    );
+    opts.insert("DIPLONAT_ACME_ENABLE".to_string(), "true".to_string());
+    opts.insert(
+        "DIPLONAT_ACME_EMAIL".to_string(),
+        "bozo@bozo.net".to_string(),
+    );
+    opts
 }
 
 #[test]
 #[should_panic]
 fn err_empty_env() {
-  std::env::remove_var("DIPLONAT_PRIVATE_IP");
-  std::env::remove_var("DIPLONAT_CONSUL_NODE_NAME");
-  ConfigOpts::from_env().unwrap();
+    std::env::remove_var("DIPLONAT_CONSUL_NODE_NAME");
+    ConfigOpts::from_env().unwrap();
 }
 
 #[test]
 fn ok_from_iter_minimal_valid_options() {
-  let opts = minimal_valid_options();
-  let rt_config = ConfigOpts::from_iter(opts.clone()).unwrap();
+    let opts = minimal_valid_options();
+    let rt_config = ConfigOpts::from_iter(opts.clone()).unwrap();
 
-  assert!(rt_config.acme.is_none());
-  assert_eq!(
-    &rt_config.consul.node_name,
-    opts.get(&"DIPLONAT_CONSUL_NODE_NAME".to_string()).unwrap()
-  );
-  assert_eq!(rt_config.consul.url, CONSUL_URL.to_string());
-  assert_eq!(
-    rt_config.firewall.refresh_time,
-    Duration::from_secs(REFRESH_TIME.into())
-  );
-  assert_eq!(
-    &rt_config.igd.private_ip,
-    opts.get(&"DIPLONAT_PRIVATE_IP".to_string()).unwrap()
-  );
-  assert_eq!(
-    rt_config.igd.expiration_time,
-    Duration::from_secs(EXPIRATION_TIME.into())
-  );
-  assert_eq!(
-    rt_config.igd.refresh_time,
-    Duration::from_secs(REFRESH_TIME.into())
-  );
+    assert_eq!(
+        &rt_config.consul.node_name,
+        opts.get(&"DIPLONAT_CONSUL_NODE_NAME".to_string()).unwrap()
+    );
+    assert_eq!(rt_config.consul.url, CONSUL_URL.to_string());
+    assert_eq!(
+        rt_config.firewall.refresh_time,
+        Duration::from_secs(REFRESH_TIME.into())
+    );
+    let igd = rt_config.igd.unwrap();
+    assert!(igd.private_ip.is_none());
+    assert_eq!(
+        igd.expiration_time,
+        Duration::from_secs(EXPIRATION_TIME.into())
+    );
+    assert_eq!(igd.refresh_time, Duration::from_secs(REFRESH_TIME.into()));
 }
 
 #[test]
 #[should_panic]
 fn err_from_iter_invalid_refresh_time() {
-  let mut opts = minimal_valid_options();
-  opts.insert("DIPLONAT_EXPIRATION_TIME".to_string(), "60".to_string());
-  opts.insert("DIPLONAT_REFRESH_TIME".to_string(), "60".to_string());
-  ConfigOpts::from_iter(opts).unwrap();
+    let mut opts = minimal_valid_options();
+    opts.insert("DIPLONAT_EXPIRATION_TIME".to_string(), "60".to_string());
+    opts.insert("DIPLONAT_REFRESH_TIME".to_string(), "60".to_string());
+    ConfigOpts::from_iter(opts).unwrap();
 }
 
 #[test]
 fn ok_from_iter_all_valid_options() {
-  let opts = all_valid_options();
-  let rt_config = ConfigOpts::from_iter(opts.clone()).unwrap();
+    let opts = all_valid_options();
+    let rt_config = ConfigOpts::from_iter(opts.clone()).unwrap();
 
-  let expiration_time = Duration::from_secs(
-    opts
-      .get(&"DIPLONAT_EXPIRATION_TIME".to_string())
-      .unwrap()
-      .parse::<u64>()
-      .unwrap()
-      .into(),
-  );
-  let refresh_time = Duration::from_secs(
-    opts
-      .get(&"DIPLONAT_REFRESH_TIME".to_string())
-      .unwrap()
-      .parse::<u64>()
-      .unwrap()
-      .into(),
-  );
+    let expiration_time = Duration::from_secs(
+        opts.get(&"DIPLONAT_EXPIRATION_TIME".to_string())
+            .unwrap()
+            .parse::<u64>()
+            .unwrap()
+            .into(),
+    );
+    let refresh_time = Duration::from_secs(
+        opts.get(&"DIPLONAT_REFRESH_TIME".to_string())
+            .unwrap()
+            .parse::<u64>()
+            .unwrap()
+            .into(),
+    );
 
-  assert!(rt_config.acme.is_some());
-  assert_eq!(
-    &rt_config.acme.unwrap().email,
-    opts.get(&"DIPLONAT_ACME_EMAIL".to_string()).unwrap()
-  );
-  assert_eq!(
-    &rt_config.consul.node_name,
-    opts.get(&"DIPLONAT_CONSUL_NODE_NAME".to_string()).unwrap()
-  );
-  assert_eq!(
-    &rt_config.consul.url,
-    opts.get(&"DIPLONAT_CONSUL_URL".to_string()).unwrap()
-  );
-  assert_eq!(rt_config.firewall.refresh_time, refresh_time);
-  assert_eq!(
-    &rt_config.igd.private_ip,
-    opts.get(&"DIPLONAT_PRIVATE_IP".to_string()).unwrap()
-  );
-  assert_eq!(rt_config.igd.expiration_time, expiration_time);
-  assert_eq!(rt_config.igd.refresh_time, refresh_time);
+    assert_eq!(
+        &rt_config.consul.node_name,
+        opts.get(&"DIPLONAT_CONSUL_NODE_NAME".to_string()).unwrap()
+    );
+    assert_eq!(
+        &rt_config.consul.url,
+        opts.get(&"DIPLONAT_CONSUL_URL".to_string()).unwrap()
+    );
+    assert_eq!(rt_config.firewall.refresh_time, refresh_time);
+    let igd = rt_config.igd.unwrap();
+    assert_eq!(
+        &igd.private_ip.unwrap().to_string(),
+        opts.get(&"DIPLONAT_PRIVATE_IP".to_string()).unwrap()
+    );
+    assert_eq!(igd.expiration_time, expiration_time);
+    assert_eq!(igd.refresh_time, refresh_time);
 }

src/config/runtime.rs

@@ -1,119 +1,191 @@
+use std::fs::File;
+use std::io::Read;
+use std::net::{Ipv4Addr, SocketAddr, ToSocketAddrs};
 use std::time::Duration;
 
-use anyhow::{anyhow, Result};
+use anyhow::{anyhow, bail, Context, Result};
 
-use crate::config::{ConfigOpts, ConfigOptsAcme, ConfigOptsBase, ConfigOptsConsul};
+use crate::config::{ConfigOpts, ConfigOptsBase, ConfigOptsConsul};
 
 // This code is inspired by the Trunk crate (https://github.com/thedodd/trunk)
 
-// In this file, we take ConfigOpts and transform them into ready-to-use RuntimeConfig.
-// We apply default values and business logic.
-
-#[derive(Debug)]
-pub struct RuntimeConfigAcme {
-  pub email: String,
-}
+// In this file, we take ConfigOpts and transform them into ready-to-use
+// RuntimeConfig. We apply default values and business logic.
 
 #[derive(Debug)]
 pub struct RuntimeConfigConsul {
-  pub node_name: String,
-  pub url: String,
+    pub node_name: String,
+    pub url: String,
+    pub tls: Option<(Option<reqwest::Certificate>, bool, reqwest::Identity)>,
 }
 
 #[derive(Debug)]
 pub struct RuntimeConfigFirewall {
-  pub refresh_time: Duration,
+    pub ipv6_only: bool,
+    pub refresh_time: Duration,
 }
 
 #[derive(Debug)]
 pub struct RuntimeConfigIgd {
-  pub private_ip: String,
-  pub expiration_time: Duration,
-  pub refresh_time: Duration,
+    pub private_ip: Option<Ipv4Addr>,
+    pub expiration_time: Duration,
+    pub refresh_time: Duration,
+}
+
+#[derive(Debug)]
+pub struct RuntimeConfigStun {
+    pub stun_server_v4: Option<SocketAddr>,
+    pub stun_server_v6: SocketAddr,
+    pub refresh_time: Duration,
 }
 
 #[derive(Debug)]
 pub struct RuntimeConfig {
-  pub acme: Option<RuntimeConfigAcme>,
-  pub consul: RuntimeConfigConsul,
-  pub firewall: RuntimeConfigFirewall,
-  pub igd: RuntimeConfigIgd,
+    pub consul: RuntimeConfigConsul,
+    pub firewall: RuntimeConfigFirewall,
+    pub igd: Option<RuntimeConfigIgd>,
+    pub stun: RuntimeConfigStun,
 }
 
 impl RuntimeConfig {
-  pub fn new(opts: ConfigOpts) -> Result<Self> {
-    let acme = RuntimeConfigAcme::new(opts.acme.clone())?;
-    let consul = RuntimeConfigConsul::new(opts.consul.clone())?;
-    let firewall = RuntimeConfigFirewall::new(opts.base.clone())?;
-    let igd = RuntimeConfigIgd::new(opts.base.clone())?;
+    pub fn new(opts: ConfigOpts) -> Result<Self> {
+        let consul = RuntimeConfigConsul::new(opts.consul)?;
+        let firewall = RuntimeConfigFirewall::new(&opts.base)?;
+        let igd = match opts.base.ipv6_only {
+            false => Some(RuntimeConfigIgd::new(&opts.base)?),
+            true => None,
+        };
+        let stun = RuntimeConfigStun::new(&opts.base)?;
 
-    Ok(Self {
-      acme,
-      consul,
-      firewall,
-      igd,
-    })
-  }
-}
-
-impl RuntimeConfigAcme {
-  pub fn new(opts: ConfigOptsAcme) -> Result<Option<Self>> {
-    if !opts.enable {
-      return Ok(None);
+        Ok(Self {
+            consul,
+            firewall,
+            igd,
+            stun,
+        })
     }
-
-    let email = opts.email.expect(
-      "'DIPLONAT_ACME_EMAIL' environment variable is required \
-			if 'DIPLONAT_ACME_ENABLE' == 'true'",
-    );
-
-    Ok(Some(Self { email }))
-  }
 }
 
 impl RuntimeConfigConsul {
-  pub(super) fn new(opts: ConfigOptsConsul) -> Result<Self> {
-    let node_name = opts
-      .node_name
-      .expect("'DIPLONAT_CONSUL_NODE_NAME' environment variable is required");
-    let url = opts.url.unwrap_or(super::CONSUL_URL.to_string());
+    pub(super) fn new(opts: ConfigOptsConsul) -> Result<Self> {
+        let node_name = opts
+            .node_name
+            .expect("'DIPLONAT_CONSUL_NODE_NAME' environment variable is required");
+        let url = opts.url.unwrap_or(super::CONSUL_URL.to_string());
 
-    Ok(Self { node_name, url })
-  }
+        let tls = match (&opts.client_cert, &opts.client_key) {
+            (Some(client_cert), Some(client_key)) => {
+                let cert = match &opts.ca_cert {
+                    Some(ca_cert) => {
+                        let mut ca_cert_buf = vec![];
+                        File::open(ca_cert)?.read_to_end(&mut ca_cert_buf)?;
+                        Some(reqwest::Certificate::from_pem(&ca_cert_buf[..])?)
+                    }
+                    None => None,
+                };
+
+                let mut client_cert_buf = vec![];
+                File::open(client_cert)?.read_to_end(&mut client_cert_buf)?;
+
+                let mut client_key_buf = vec![];
+                File::open(client_key)?.read_to_end(&mut client_key_buf)?;
+
+                let ident = reqwest::Identity::from_pem(
+                    &[&client_cert_buf[..], &client_key_buf[..]].concat()[..],
+                )?;
+
+                Some((cert, opts.tls_skip_verify, ident))
+            }
+            (None, None) => None,
+            _ => bail!("Incomplete TLS configuration parameters"),
+        };
+
+        Ok(Self {
+            node_name,
+            url,
+            tls,
+        })
+    }
 }
 
 impl RuntimeConfigFirewall {
-  pub(super) fn new(opts: ConfigOptsBase) -> Result<Self> {
-    let refresh_time = Duration::from_secs(opts.refresh_time.unwrap_or(super::REFRESH_TIME).into());
+    pub(super) fn new(opts: &ConfigOptsBase) -> Result<Self> {
+        let refresh_time =
+            Duration::from_secs(opts.refresh_time.unwrap_or(super::REFRESH_TIME).into());
 
-    Ok(Self { refresh_time })
-  }
+        Ok(Self {
+            refresh_time,
+            ipv6_only: opts.ipv6_only,
+        })
+    }
 }
 
 impl RuntimeConfigIgd {
-  pub(super) fn new(opts: ConfigOptsBase) -> Result<Self> {
-    let private_ip = opts
-      .private_ip
-      .expect("'DIPLONAT_PRIVATE_IP' environment variable is required");
-    let expiration_time = Duration::from_secs(
-      opts
-        .expiration_time
-        .unwrap_or(super::EXPIRATION_TIME)
-        .into(),
-    );
-    let refresh_time = Duration::from_secs(opts.refresh_time.unwrap_or(super::REFRESH_TIME).into());
+    pub(super) fn new(opts: &ConfigOptsBase) -> Result<Self> {
+        let private_ip = opts
+            .private_ip
+            .as_ref()
+            .map(|x| x.parse())
+            .transpose()
+            .context("parse private_ip")?;
+        let expiration_time = Duration::from_secs(
+            opts.expiration_time
+                .unwrap_or(super::EXPIRATION_TIME)
+                .into(),
+        );
+        let refresh_time =
+            Duration::from_secs(opts.refresh_time.unwrap_or(super::REFRESH_TIME).into());
 
-    if refresh_time.as_secs() * 2 > expiration_time.as_secs() {
-      return Err(anyhow!(
-	        "IGD expiration time (currently: {}s) must be at least twice bigger than refresh time (currently: {}s)", 
-	        expiration_time.as_secs(),
-	        refresh_time.as_secs()));
+        if refresh_time.as_secs() * 2 > expiration_time.as_secs() {
+            return Err(anyhow!(
+        "IGD expiration time (currently: {}s) must be at least twice bigger than refresh time \
+         (currently: {}s)",
+        expiration_time.as_secs(),
+        refresh_time.as_secs()
+      ));
+        }
+
+        Ok(Self {
+            private_ip,
+            expiration_time,
+            refresh_time,
+        })
+    }
+}
+
+impl RuntimeConfigStun {
+    pub(super) fn new(opts: &ConfigOptsBase) -> Result<Self> {
+        let mut stun_server_v4 = None;
+        let mut stun_server_v6 = None;
+        for addr in opts
+            .stun_server
+            .as_deref()
+            .unwrap_or(super::STUN_SERVER)
+            .to_socket_addrs()?
+        {
+            if addr.is_ipv4() {
+                stun_server_v4 = Some(addr);
+            }
+            if addr.is_ipv6() {
+                stun_server_v6 = Some(addr);
+            }
+        }
+
+        let refresh_time =
+            Duration::from_secs(opts.refresh_time.unwrap_or(super::REFRESH_TIME).into());
+
+        let stun_server_v4 = match opts.ipv6_only {
+            false => Some(
+                stun_server_v4.ok_or(anyhow!("Unable to resolve STUN server's IPv4 address"))?,
+            ),
+            true => None,
+        };
+
+        Ok(Self {
+            stun_server_v4,
+            stun_server_v6: stun_server_v6
+                .ok_or(anyhow!("Unable to resolve STUN server's IPv6 address"))?,
+            refresh_time,
+        })
     }
-
-    Ok(Self {
-      private_ip,
-      expiration_time,
-      refresh_time,
-    })
-  }
 }

src/consul.rs

@@ -1,49 +1,86 @@
+use std::collections::HashMap;
+
 use anyhow::{anyhow, Result};
 use serde::{Deserialize, Serialize};
-use std::collections::HashMap;
+
+use crate::config::RuntimeConfigConsul;
 
 #[derive(Serialize, Deserialize, Debug)]
 pub struct ServiceEntry {
-  pub Tags: Vec<String>,
+    #[serde(rename = "Tags")]
+    pub tags: Vec<String>,
 }
 
-#[derive(Serialize, Deserialize, Debug)]
+#[derive(Serialize, Deserialize, Debug, Default)]
 pub struct CatalogNode {
-  pub Services: HashMap<String, ServiceEntry>,
+    #[serde(rename = "Services")]
+    pub services: HashMap<String, ServiceEntry>,
 }
 
 pub struct Consul {
-  client: reqwest::Client,
-  url: String,
-  idx: Option<u64>,
+    client: reqwest::Client,
+    url: String,
+    idx: Option<u64>,
 }
 
 impl Consul {
-  pub fn new(url: &str) -> Self {
-    return Self {
-      client: reqwest::Client::new(),
-      url: url.to_string(),
-      idx: None,
-    };
-  }
+    pub fn new(config: &RuntimeConfigConsul) -> Self {
+        let client = if let Some((ca, skip_verify, ident)) = config.tls.clone() {
+            if skip_verify {
+                reqwest::Client::builder()
+                    .use_rustls_tls()
+                    .danger_accept_invalid_certs(true)
+                    .identity(ident)
+                    .build()
+                    .expect("Unable to build reqwest client")
+            } else if let Some(ca) = ca {
+                reqwest::Client::builder()
+                    .use_rustls_tls()
+                    .add_root_certificate(ca)
+                    .identity(ident)
+                    .build()
+                    .expect("Unable to build reqwest client")
+            } else {
+                reqwest::Client::builder()
+                    .use_rustls_tls()
+                    .identity(ident)
+                    .build()
+                    .expect("Unable to build reqwest client")
+            }
+        } else {
+            reqwest::Client::new()
+        };
+        return Self {
+            client,
+            url: config.url.clone(),
+            idx: None,
+        };
+    }
 
-  pub fn watch_node_reset(&mut self) -> () {
-    self.idx = None;
-  }
+    pub fn watch_node_reset(&mut self) -> () {
+        self.idx = None;
+    }
 
-  pub async fn watch_node(&mut self, host: &str) -> Result<CatalogNode> {
-    let url = match self.idx {
-      Some(i) => format!("{}/v1/catalog/node/{}?index={}", self.url, host, i),
-      None => format!("{}/v1/catalog/node/{}", self.url, host),
-    };
+    pub async fn watch_node(&mut self, host: &str) -> Result<CatalogNode> {
+        let url = match self.idx {
+            Some(i) => format!("{}/v1/catalog/node/{}?index={}", self.url, host, i),
+            None => format!("{}/v1/catalog/node/{}", self.url, host),
+        };
 
-    let http = self.client.get(&url).send().await?;
-    self.idx = match http.headers().get("X-Consul-Index") {
-      Some(v) => Some(v.to_str()?.parse::<u64>()?),
-      None => return Err(anyhow!("X-Consul-Index header not found")),
-    };
+        let http = self.client.get(&url).send().await?;
+        self.idx = match http.headers().get("X-Consul-Index") {
+            Some(v) => Some(v.to_str()?.parse::<u64>()?),
+            None => return Err(anyhow!("X-Consul-Index header not found")),
+        };
 
-    let resp: CatalogNode = http.json().await?;
-    return Ok(resp);
-  }
+        let resp: Option<CatalogNode> = http.json().await?;
+        return Ok(resp.unwrap_or_default());
+    }
+
+    pub async fn kv_put(&self, key: &str, bytes: Vec<u8>) -> Result<()> {
+        let url = format!("{}/v1/kv/{}", self.url, key);
+        let http = self.client.put(&url).body(bytes).send().await?;
+        http.error_for_status()?;
+        Ok(())
+    }
 }

src/consul_actor.rs

@@ -1,117 +1,120 @@
-use crate::consul;
-use crate::messages;
+use std::{cmp, collections::HashSet, time::Duration};
+
 use anyhow::Result;
 use log::*;
 use serde::{Deserialize, Serialize};
 use serde_lexpr::{error, from_str};
-use std::cmp;
-use std::collections::HashSet;
-use std::time::Duration;
-use tokio::sync::watch;
-use tokio::time::delay_for;
+use tokio::{sync::watch, time::sleep};
+
+use crate::config::RuntimeConfigConsul;
+use crate::{consul, messages};
 
 #[derive(Serialize, Deserialize, Debug)]
 pub enum DiplonatParameter {
-  tcp_port(HashSet<u16>),
-  udp_port(HashSet<u16>),
+    #[serde(rename = "tcp_port")]
+    TcpPort(HashSet<u16>),
+    #[serde(rename = "udp_port")]
+    UdpPort(HashSet<u16>),
 }
 
 #[derive(Serialize, Deserialize, Debug)]
 pub enum DiplonatConsul {
-  diplonat(Vec<DiplonatParameter>),
+    #[serde(rename = "diplonat")]
+    Diplonat(Vec<DiplonatParameter>),
 }
 
 pub struct ConsulActor {
-  pub rx_open_ports: watch::Receiver<messages::PublicExposedPorts>,
+    pub rx_open_ports: watch::Receiver<messages::PublicExposedPorts>,
 
-  consul: consul::Consul,
-  node: String,
-  retries: u32,
-  tx_open_ports: watch::Sender<messages::PublicExposedPorts>,
+    consul: consul::Consul,
+    node: String,
+    retries: u32,
+    tx_open_ports: watch::Sender<messages::PublicExposedPorts>,
 }
 
 fn retry_to_time(retries: u32, max_time: Duration) -> Duration {
-  // 1.2^x seems to be a good value to exponentially increase time at a good pace
-  // eg. 1.2^32 = 341 seconds ~= 5 minutes - ie. after 32 retries we wait 5 minutes
-  return Duration::from_secs(cmp::min(
-    max_time.as_secs(),
-    1.2f64.powf(retries as f64) as u64,
-  ));
+    // 1.2^x seems to be a good value to exponentially increase time at a good pace
+    // eg. 1.2^32 = 341 seconds ~= 5 minutes - ie. after 32 retries we wait 5
+    // minutes
+    return Duration::from_secs(cmp::min(
+        max_time.as_secs(),
+        1.2f64.powf(retries as f64) as u64,
+    ));
 }
 
 fn to_parameters(catalog: &consul::CatalogNode) -> Vec<DiplonatConsul> {
-  let mut r = Vec::new();
+    let mut r = Vec::new();
 
-  for (_, service_info) in &catalog.Services {
-    for tag in &service_info.Tags {
-      let diplo_conf: error::Result<DiplonatConsul> = from_str(tag);
-      match diplo_conf {
-        Ok(conf) => r.push(conf),
-        Err(e) => debug!("Failed to parse entry {}. {}", tag, e),
-      };
+    for (_, service_info) in &catalog.services {
+        for tag in &service_info.tags {
+            let diplo_conf: error::Result<DiplonatConsul> = from_str(tag);
+            match diplo_conf {
+                Ok(conf) => r.push(conf),
+                Err(e) => debug!("Failed to parse entry {}. {}", tag, e),
+            };
+        }
     }
-  }
 
-  return r;
+    return r;
 }
 
 fn to_open_ports(params: &Vec<DiplonatConsul>) -> messages::PublicExposedPorts {
-  let mut op = messages::PublicExposedPorts {
-    tcp_ports: HashSet::new(),
-    udp_ports: HashSet::new(),
-  };
+    let mut op = messages::PublicExposedPorts {
+        tcp_ports: HashSet::new(),
+        udp_ports: HashSet::new(),
+    };
 
-  for conf in params {
-    let DiplonatConsul::diplonat(c) = conf;
-    for parameter in c {
-      match parameter {
-        DiplonatParameter::tcp_port(p) => op.tcp_ports.extend(p),
-        DiplonatParameter::udp_port(p) => op.udp_ports.extend(p),
-      };
+    for conf in params {
+        let DiplonatConsul::Diplonat(c) = conf;
+        for parameter in c {
+            match parameter {
+                DiplonatParameter::TcpPort(p) => op.tcp_ports.extend(p),
+                DiplonatParameter::UdpPort(p) => op.udp_ports.extend(p),
+            };
+        }
     }
-  }
 
-  return op;
+    return op;
 }
 
 impl ConsulActor {
-  pub fn new(url: &str, node: &str) -> Self {
-    let (tx, rx) = watch::channel(messages::PublicExposedPorts {
-      tcp_ports: HashSet::new(),
-      udp_ports: HashSet::new(),
-    });
+    pub fn new(config: &RuntimeConfigConsul, node: &str) -> Self {
+        let (tx, rx) = watch::channel(messages::PublicExposedPorts {
+            tcp_ports: HashSet::new(),
+            udp_ports: HashSet::new(),
+        });
 
-    return Self {
-      consul: consul::Consul::new(url),
-      rx_open_ports: rx,
-      tx_open_ports: tx,
-      node: node.to_string(),
-      retries: 0,
-    };
-  }
-
-  pub async fn listen(&mut self) -> Result<()> {
-    loop {
-      let catalog = match self.consul.watch_node(&self.node).await {
-        Ok(c) => c,
-        Err(e) => {
-          self.consul.watch_node_reset();
-          self.retries = cmp::min(std::u32::MAX - 1, self.retries) + 1;
-          let will_retry_in = retry_to_time(self.retries, Duration::from_secs(600));
-          error!(
-            "Failed to query consul. Will retry in {}s. {}",
-            will_retry_in.as_secs(),
-            e
-          );
-          delay_for(will_retry_in).await;
-          continue;
-        }
-      };
-      self.retries = 0;
-      let msg = to_open_ports(&to_parameters(&catalog));
-      debug!("Extracted configuration: {:#?}", msg);
-
-      self.tx_open_ports.broadcast(msg)?;
+        return Self {
+            consul: consul::Consul::new(config),
+            rx_open_ports: rx,
+            tx_open_ports: tx,
+            node: node.to_string(),
+            retries: 0,
+        };
+    }
+
+    pub async fn listen(&mut self) -> Result<()> {
+        loop {
+            let catalog = match self.consul.watch_node(&self.node).await {
+                Ok(c) => c,
+                Err(e) => {
+                    self.consul.watch_node_reset();
+                    self.retries = cmp::min(std::u32::MAX - 1, self.retries) + 1;
+                    let will_retry_in = retry_to_time(self.retries, Duration::from_secs(600));
+                    error!(
+                        "Failed to query consul. Will retry in {}s. {}",
+                        will_retry_in.as_secs(),
+                        e
+                    );
+                    sleep(will_retry_in).await;
+                    continue;
+                }
+            };
+            self.retries = 0;
+            let msg = to_open_ports(&to_parameters(&catalog));
+            debug!("Extracted configuration: {:#?}", msg);
+
+            self.tx_open_ports.send(msg)?;
+        }
     }
-  }
 }

src/diplonat.rs

@@ -1,50 +1,78 @@
-use anyhow::Result;
+use anyhow::{Context, Result};
+use futures::future::FutureExt;
 use tokio::try_join;
 
-use crate::config::ConfigOpts;
-use crate::consul_actor::ConsulActor;
-use crate::fw_actor::FirewallActor;
-use crate::igd_actor::IgdActor;
+use crate::{
+    config::ConfigOpts, consul_actor::ConsulActor, fw_actor::FirewallActor, igd_actor::IgdActor,
+    stun_actor::StunActor,
+};
 
 pub struct Diplonat {
-  consul: ConsulActor,
-  firewall: FirewallActor,
-  igd: IgdActor,
+    consul: ConsulActor,
+    firewall: FirewallActor,
+    igd: Option<IgdActor>,
+    stun: StunActor,
 }
 
 impl Diplonat {
-  pub async fn new() -> Result<Self> {
-    let rt_cfg = ConfigOpts::from_env()?;
-    println!("{:#?}", rt_cfg);
+    pub async fn new() -> Result<Self> {
+        let rt_cfg = ConfigOpts::from_env().context("Parse configuration")?;
+        println!("{:#?}", rt_cfg);
 
-    let ca = ConsulActor::new(&rt_cfg.consul.url, &rt_cfg.consul.node_name);
+        let ca = ConsulActor::new(&rt_cfg.consul, &rt_cfg.consul.node_name);
 
-    let fw = FirewallActor::new(rt_cfg.firewall.refresh_time, &ca.rx_open_ports).await?;
+        let fw = FirewallActor::new(
+            rt_cfg.firewall.ipv6_only,
+            rt_cfg.firewall.refresh_time,
+            &ca.rx_open_ports,
+        )
+        .await
+        .context("Setup fireall actor")?;
 
-    let ia = IgdActor::new(
-      &rt_cfg.igd.private_ip,
-      rt_cfg.igd.refresh_time,
-      rt_cfg.igd.expiration_time,
-      &ca.rx_open_ports,
-    )
-    .await?;
+        let ia = match rt_cfg.igd {
+            Some(igdc) => Some(
+                IgdActor::new(
+                    igdc.private_ip,
+                    igdc.refresh_time,
+                    igdc.expiration_time,
+                    &ca.rx_open_ports,
+                )
+                .await
+                .context("Setup IGD actor")?,
+            ),
+            None => None,
+        };
 
-    let ctx = Self {
-      consul: ca,
-      igd: ia,
-      firewall: fw,
-    };
+        let sa = StunActor::new(&rt_cfg.consul, &rt_cfg.stun, &rt_cfg.consul.node_name);
 
-    return Ok(ctx);
-  }
+        let ctx = Self {
+            consul: ca,
+            igd: ia,
+            firewall: fw,
+            stun: sa,
+        };
 
-  pub async fn listen(&mut self) -> Result<()> {
-    try_join!(
-      self.consul.listen(),
-      self.igd.listen(),
-      self.firewall.listen()
-    )?;
+        Ok(ctx)
+    }
 
-    return Ok(());
-  }
+    pub async fn listen(&mut self) -> Result<()> {
+        let igd_opt = &mut self.igd;
+
+        try_join!(
+            self.consul.listen().map(|x| x.context("Run consul actor")),
+            async {
+                if let Some(igd) = igd_opt {
+                    igd.listen().await.context("Run IGD actor")
+                } else {
+                    Ok(())
+                }
+            },
+            self.firewall
+                .listen()
+                .map(|x| x.context("Run firewall actor")),
+            self.stun.listen().map(|x| x.context("Run STUN actor")),
+        )?;
+
+        Ok(())
+    }
 }

src/fw.rs

@@ -1,97 +1,103 @@
-use crate::messages;
+use std::collections::HashSet;
+
 use anyhow::{Context, Result};
 use iptables;
 use log::*;
 use regex::Regex;
-use std::collections::HashSet;
+
+use crate::messages;
 
 pub fn setup(ipt: &iptables::IPTables) -> Result<()> {
-  // ensure we start from a clean state without any rule already set
-  cleanup(ipt)?;
+    // ensure we start from a clean state without any rule already set
+    cleanup(ipt)?;
 
-  ipt
-    .new_chain("filter", "DIPLONAT")
-    .context("Failed to create new chain")?;
-  ipt
-    .insert_unique("filter", "INPUT", "-j DIPLONAT", 1)
-    .context("Failed to insert jump rule")?;
+    info!("{}: creating DIPLONAT chain", ipt.cmd);
+    ipt.new_chain("filter", "DIPLONAT")
+        .context("Failed to create new chain")?;
+    ipt.insert_unique("filter", "INPUT", "-j DIPLONAT", 1)
+        .context("Failed to insert jump rule")?;
 
-  Ok(())
+    Ok(())
 }
 
 pub fn open_ports(ipt: &iptables::IPTables, ports: messages::PublicExposedPorts) -> Result<()> {
-  for p in ports.tcp_ports {
-    ipt
-      .append(
-        "filter",
-        "DIPLONAT",
-        &format!("-p tcp --dport {} -j ACCEPT", p),
-      )
-      .context("Failed to insert port rule")?;
-  }
+    for p in ports.tcp_ports {
+        info!("{}: opening TCP port {}", ipt.cmd, p);
+        ipt.append(
+            "filter",
+            "DIPLONAT",
+            &format!("-p tcp --dport {} -j ACCEPT", p),
+        )
+        .context("Failed to insert port rule")?;
+    }
 
-  for p in ports.udp_ports {
-    ipt
-      .append(
-        "filter",
-        "DIPLONAT",
-        &format!("-p udp --dport {} -j ACCEPT", p),
-      )
-      .context("Failed to insert port rule")?;
-  }
+    for p in ports.udp_ports {
+        info!("{}: opening UDP port {}", ipt.cmd, p);
+        ipt.append(
+            "filter",
+            "DIPLONAT",
+            &format!("-p udp --dport {} -j ACCEPT", p),
+        )
+        .context("Failed to insert port rule")?;
+    }
 
-  Ok(())
+    Ok(())
 }
 
 pub fn get_opened_ports(ipt: &iptables::IPTables) -> Result<messages::PublicExposedPorts> {
-  let mut ports = messages::PublicExposedPorts {
-    tcp_ports: HashSet::new(),
-    udp_ports: HashSet::new(),
-  };
+    let mut ports = messages::PublicExposedPorts {
+        tcp_ports: HashSet::new(),
+        udp_ports: HashSet::new(),
+    };
 
-  let list = ipt.list("filter", "DIPLONAT")?;
-  let re = Regex::new(r"\-A.*? \-p (\w+).*\-\-dport (\d+).*?\-j ACCEPT")
-    .context("Regex matching open ports encountered an unexpected rule")?;
-  for i in list {
-    let caps = re.captures(&i);
-    match caps {
-      Some(c) => {
-        if let (Some(raw_proto), Some(raw_port)) = (c.get(1), c.get(2)) {
-          let proto = String::from(raw_proto.as_str());
-          let number = String::from(raw_port.as_str()).parse::<u16>()?;
+    let list = ipt.list("filter", "DIPLONAT")?;
+    let re = Regex::new(r"\-A.*? \-p (\w+).*\-\-dport (\d+).*?\-j ACCEPT")
+        .context("Regex matching open ports encountered an unexpected rule")?;
+    for i in list {
+        debug!("{} list DIPLONAT: got {}", ipt.cmd, i);
+        let caps = re.captures(&i);
+        match caps {
+            Some(c) => {
+                if let (Some(raw_proto), Some(raw_port)) = (c.get(1), c.get(2)) {
+                    let proto = String::from(raw_proto.as_str());
+                    let number = String::from(raw_port.as_str()).parse::<u16>()?;
 
-          if proto == "tcp" {
-            ports.tcp_ports.insert(number);
-          } else {
-            ports.udp_ports.insert(number);
-          }
-        } else {
-          error!("Unexpected rule found in DIPLONAT chain")
+                    if proto == "tcp" || proto == "6" {
+                        ports.tcp_ports.insert(number);
+                    } else if proto == "udp" || proto == "17" {
+                        ports.udp_ports.insert(number);
+                    } else {
+                        error!("Unexpected protocol in iptables rule: {}", proto);
+                    }
+                } else {
+                    error!("Unexpected rule found in DIPLONAT chain")
+                }
+            }
+            _ => {
+                debug!("{} rule not parsed: {}", ipt.cmd, i);
+            }
         }
-      }
-      _ => {}
     }
-  }
 
-  Ok(ports)
+    debug!("{} ports already openned: {:?}", ipt.cmd, ports);
+
+    Ok(ports)
 }
 
 pub fn cleanup(ipt: &iptables::IPTables) -> Result<()> {
-  if ipt.chain_exists("filter", "DIPLONAT")? {
-    ipt
-      .flush_chain("filter", "DIPLONAT")
-      .context("Failed to flush the DIPLONAT chain")?;
+    if ipt.chain_exists("filter", "DIPLONAT")? {
+        info!("{}: removing old DIPLONAT chain", ipt.cmd);
+        ipt.flush_chain("filter", "DIPLONAT")
+            .context("Failed to flush the DIPLONAT chain")?;
 
-    if ipt.exists("filter", "INPUT", "-j DIPLONAT")? {
-      ipt
-        .delete("filter", "INPUT", "-j DIPLONAT")
-        .context("Failed to delete jump rule")?;
+        if ipt.exists("filter", "INPUT", "-j DIPLONAT")? {
+            ipt.delete("filter", "INPUT", "-j DIPLONAT")
+                .context("Failed to delete jump rule")?;
+        }
+
+        ipt.delete_chain("filter", "DIPLONAT")
+            .context("Failed to delete chain")?;
     }
 
-    ipt
-      .delete_chain("filter", "DIPLONAT")
-      .context("Failed to delete chain")?;
-  }
-
-  Ok(())
+    Ok(())
 }

src/fw_actor.rs

@@ -1,86 +1,103 @@
-use anyhow::Result;
-use log::*;
-use tokio::{
-  select,
-  sync::watch,
-  time::{self, Duration},
-};
-
-use crate::fw;
-use crate::messages;
-use iptables;
 use std::collections::HashSet;
 
+use anyhow::Result;
+use iptables;
+use log::*;
+use tokio::{
+    select,
+    sync::watch,
+    time::{self, Duration},
+};
+
+use crate::{fw, messages};
+
 pub struct FirewallActor {
-  pub ipt: iptables::IPTables,
-  rx_ports: watch::Receiver<messages::PublicExposedPorts>,
-  last_ports: messages::PublicExposedPorts,
-  refresh: Duration,
+    pub ipt_v4: Option<iptables::IPTables>,
+    pub ipt_v6: iptables::IPTables,
+    rx_ports: watch::Receiver<messages::PublicExposedPorts>,
+    last_ports: messages::PublicExposedPorts,
+    refresh: Duration,
 }
 
 impl FirewallActor {
-  pub async fn new(
-    _refresh: Duration,
-    rxp: &watch::Receiver<messages::PublicExposedPorts>,
-  ) -> Result<Self> {
-    let ctx = Self {
-      ipt: iptables::new(false)?,
-      rx_ports: rxp.clone(),
-      last_ports: messages::PublicExposedPorts::new(),
-      refresh: _refresh,
-    };
+    pub async fn new(
+        ipv6_only: bool,
+        refresh: Duration,
+        rxp: &watch::Receiver<messages::PublicExposedPorts>,
+    ) -> Result<Self> {
+        let ctx = Self {
+            ipt_v4: match ipv6_only {
+                false => Some(iptables::new(false)?),
+                true => None,
+            },
+            ipt_v6: iptables::new(true)?,
+            rx_ports: rxp.clone(),
+            last_ports: messages::PublicExposedPorts::new(),
+            refresh,
+        };
 
-    fw::setup(&ctx.ipt)?;
+        if let Some(ipt_v4) = &ctx.ipt_v4 {
+            fw::setup(ipt_v4)?;
+        }
+        fw::setup(&ctx.ipt_v6)?;
 
-    return Ok(ctx);
-  }
-
-  pub async fn listen(&mut self) -> Result<()> {
-    let mut interval = time::interval(self.refresh);
-    loop {
-      // 1. Wait for an event
-      let new_ports = select! {
-        Some(ports) = self.rx_ports.recv() => Some(ports),
-        _ = interval.tick() => None,
-        else => return Ok(()) // Sender dropped, terminate loop.
-      };
-
-      // 2. Update last ports if needed
-      if let Some(p) = new_ports {
-        self.last_ports = p;
-      }
-
-      // 3. Update firewall rules
-      match self.do_fw_update().await {
-        Ok(()) => debug!("Successfully updated firewall rules"),
-        Err(e) => error!("An error occured while updating firewall rules. {}", e),
-      }
+        return Ok(ctx);
     }
-  }
 
-  pub async fn do_fw_update(&self) -> Result<()> {
-    let curr_opened_ports = fw::get_opened_ports(&self.ipt)?;
+    pub async fn listen(&mut self) -> Result<()> {
+        let mut interval = time::interval(self.refresh);
+        loop {
+            // 1. Wait for an event
+            let new_ports = select! {
+              _ = self.rx_ports.changed() => Some(self.rx_ports.borrow().clone()),
+              _ = interval.tick() => None,
+              else => return Ok(()) // Sender dropped, terminate loop.
+            };
 
-    let diff_tcp = self
-      .last_ports
-      .tcp_ports
-      .difference(&curr_opened_ports.tcp_ports)
-      .copied()
-      .collect::<HashSet<u16>>();
-    let diff_udp = self
-      .last_ports
-      .udp_ports
-      .difference(&curr_opened_ports.udp_ports)
-      .copied()
-      .collect::<HashSet<u16>>();
+            // 2. Update last ports if needed
+            if let Some(p) = new_ports {
+                self.last_ports = p;
+            }
 
-    let ports_to_open = messages::PublicExposedPorts {
-      tcp_ports: diff_tcp,
-      udp_ports: diff_udp,
-    };
+            // 3. Update firewall rules
+            match self.do_fw_update().await {
+                Ok(()) => debug!("Successfully updated firewall rules"),
+                Err(e) => error!("An error occured while updating firewall rules. {}", e),
+            }
+        }
+    }
 
-    fw::open_ports(&self.ipt, ports_to_open)?;
+    pub async fn do_fw_update(&self) -> Result<()> {
+        if let Some(ipt_v4) = &self.ipt_v4 {
+            self.do_fw_update_on(ipt_v4).await?;
+        }
+        self.do_fw_update_on(&self.ipt_v6).await?;
+        Ok(())
+    }
 
-    return Ok(());
-  }
+    pub async fn do_fw_update_on(&self, ipt: &iptables::IPTables) -> Result<()> {
+        let curr_opened_ports = fw::get_opened_ports(ipt)?;
+
+        let diff_tcp = self
+            .last_ports
+            .tcp_ports
+            .difference(&curr_opened_ports.tcp_ports)
+            .copied()
+            .collect::<HashSet<u16>>();
+        let diff_udp = self
+            .last_ports
+            .udp_ports
+            .difference(&curr_opened_ports.udp_ports)
+            .copied()
+            .collect::<HashSet<u16>>();
+
+        let ports_to_open = messages::PublicExposedPorts {
+            tcp_ports: diff_tcp,
+            udp_ports: diff_udp,
+        };
+
+        fw::open_ports(ipt, ports_to_open)?;
+
+        return Ok(());
+    }
 }

src/igd_actor.rs

@@ -1,97 +1,122 @@
-use crate::messages;
+use std::net::{Ipv4Addr, SocketAddrV4};
+
 use anyhow::{Context, Result};
-use igd::aio::*;
-use igd::PortMappingProtocol;
+use igd::{aio::*, PortMappingProtocol};
 use log::*;
-use std::net::SocketAddrV4;
 use tokio::{
-  select,
-  sync::watch,
-  time::{self, Duration},
+    select,
+    sync::watch,
+    time::{self, Duration},
 };
 
+use crate::messages;
+
 pub struct IgdActor {
-  last_ports: messages::PublicExposedPorts,
-  rx_ports: watch::Receiver<messages::PublicExposedPorts>,
-  gateway: Gateway,
-  refresh: Duration,
-  expire: Duration,
-  private_ip: String,
+    last_ports: messages::PublicExposedPorts,
+    rx_ports: watch::Receiver<messages::PublicExposedPorts>,
+    gateway: Gateway,
+    refresh: Duration,
+    expire: Duration,
+    private_ip: Ipv4Addr,
 }
 
 impl IgdActor {
-  pub async fn new(
-    priv_ip: &str,
-    refresh: Duration,
-    expire: Duration,
-    rxp: &watch::Receiver<messages::PublicExposedPorts>,
-  ) -> Result<Self> {
-    let gw = search_gateway(Default::default())
-      .await
-      .context("Failed to find IGD gateway")?;
-    info!("IGD gateway: {}", gw);
+    pub async fn new(
+        priv_ip: Option<Ipv4Addr>,
+        refresh: Duration,
+        expire: Duration,
+        rxp: &watch::Receiver<messages::PublicExposedPorts>,
+    ) -> Result<Self> {
+        let gw = search_gateway(Default::default())
+            .await
+            .context("Failed to find IGD gateway")?;
+        info!("IGD gateway: {}", gw);
 
-    let ctx = Self {
-      gateway: gw,
-      rx_ports: rxp.clone(),
-      private_ip: priv_ip.to_string(),
-      refresh: refresh,
-      expire: expire,
-      last_ports: messages::PublicExposedPorts::new(),
-    };
+        let private_ip = if let Some(ip) = priv_ip {
+            info!("Using private IP from config: {}", ip);
+            ip
+        } else {
+            info!("Trying to automatically detect private IP");
+            let gwa = gw.addr.ip().octets();
+            let cmplen = match gwa {
+                [192, 168, _, _] => 3,
+                [10, _, _, _] => 2,
+                _ => panic!(
+                    "Gateway IP does not appear to be in a local network ({})",
+                    gw.addr.ip()
+                ),
+            };
+            #[allow(unused_parens)]
+            let private_ip = get_if_addrs::get_if_addrs()?
+                .into_iter()
+                .map(|i| i.addr.ip())
+                .filter_map(|a| match a {
+                    std::net::IpAddr::V4(a4) if a4.octets()[..cmplen] == gwa[..cmplen] => Some(a4),
+                    _ => None,
+                })
+                .next()
+                .expect("No interface has an IP on same subnet as gateway");
+            info!("Autodetected private IP: {}", private_ip);
+            private_ip
+        };
 
-    return Ok(ctx);
-  }
+        let ctx = Self {
+            gateway: gw,
+            rx_ports: rxp.clone(),
+            private_ip,
+            refresh: refresh,
+            expire: expire,
+            last_ports: messages::PublicExposedPorts::new(),
+        };
 
-  pub async fn listen(&mut self) -> Result<()> {
-    let mut interval = time::interval(self.refresh);
-    loop {
-      // 1. Wait for an event
-      let new_ports = select! {
-        Some(ports) = self.rx_ports.recv() => Some(ports),
-        _ = interval.tick() => None,
-        else => return Ok(()) // Sender dropped, terminate loop.
-      };
-
-      // 2. Update last ports if needed
-      if let Some(p) = new_ports {
-        self.last_ports = p;
-      }
-
-      // 3. Flush IGD requests
-      match self.do_igd().await {
-        Ok(()) => debug!("Successfully updated IGD"),
-        Err(e) => error!("An error occured while updating IGD. {}", e),
-      }
-    }
-  }
-
-  pub async fn do_igd(&self) -> Result<()> {
-    let actions = [
-      (PortMappingProtocol::TCP, &self.last_ports.tcp_ports),
-      (PortMappingProtocol::UDP, &self.last_ports.udp_ports),
-    ];
-
-    for (proto, list) in actions.iter() {
-      for port in *list {
-        let service_str = format!("{}:{}", self.private_ip, port);
-        let service = service_str
-          .parse::<SocketAddrV4>()
-          .context("Invalid socket address")?;
-        self
-          .gateway
-          .add_port(
-            *proto,
-            *port,
-            service,
-            self.expire.as_secs() as u32,
-            "diplonat",
-          )
-          .await?;
-        debug!("IGD request successful for {:#?} {}", proto, service);
-      }
+        return Ok(ctx);
     }
 
-    return Ok(());
-  }
+    pub async fn listen(&mut self) -> Result<()> {
+        let mut interval = time::interval(self.refresh);
+        loop {
+            // 1. Wait for an event
+            let new_ports = select! {
+              _ = self.rx_ports.changed() => Some(self.rx_ports.borrow().clone()),
+              _ = interval.tick() => None,
+              else => return Ok(()) // Sender dropped, terminate loop.
+            };
+
+            // 2. Update last ports if needed
+            if let Some(p) = new_ports {
+                self.last_ports = p;
+            }
+
+            // 3. Flush IGD requests
+            match self.do_igd().await {
+                Ok(()) => debug!("Successfully updated IGD"),
+                Err(e) => error!("An error occured while updating IGD. {}", e),
+            }
+        }
+    }
+
+    pub async fn do_igd(&self) -> Result<()> {
+        let actions = [
+            (PortMappingProtocol::TCP, &self.last_ports.tcp_ports),
+            (PortMappingProtocol::UDP, &self.last_ports.udp_ports),
+        ];
+
+        for (proto, list) in actions.iter() {
+            for port in *list {
+                let service = SocketAddrV4::new(self.private_ip, *port);
+                self.gateway
+                    .add_port(
+                        *proto,
+                        *port,
+                        service,
+                        self.expire.as_secs() as u32,
+                        "diplonat",
+                    )
+                    .await?;
+                debug!("IGD request successful for {:#?} {}", proto, service);
+            }
+        }
+
+        return Ok(());
+    }
 }

src/main.rs

@@ -6,15 +6,20 @@ mod fw;
 mod fw_actor;
 mod igd_actor;
 mod messages;
+mod stun_actor;
 
 use diplonat::Diplonat;
 use log::*;
 
 #[tokio::main]
 async fn main() {
-  pretty_env_logger::init();
-  info!("Starting Diplonat");
+    pretty_env_logger::init();
+    info!("Starting Diplonat");
 
-  let mut diplo = Diplonat::new().await.expect("Setup failed");
-  diplo.listen().await.expect("A runtime error occured");
+    Diplonat::new()
+        .await
+        .expect("Setup failed")
+        .listen()
+        .await
+        .expect("A runtime error occured");
 }

src/messages.rs

@@ -2,15 +2,15 @@ use std::collections::HashSet;
 
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct PublicExposedPorts {
-  pub tcp_ports: HashSet<u16>,
-  pub udp_ports: HashSet<u16>,
+    pub tcp_ports: HashSet<u16>,
+    pub udp_ports: HashSet<u16>,
 }
 
 impl PublicExposedPorts {
-  pub fn new() -> Self {
-    return Self {
-      tcp_ports: HashSet::new(),
-      udp_ports: HashSet::new(),
-    };
-  }
+    pub fn new() -> Self {
+        return Self {
+            tcp_ports: HashSet::new(),
+            udp_ports: HashSet::new(),
+        };
+    }
 }

src/stun_actor.rs

@@ -0,0 +1,176 @@
+use std::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr};
+use std::time::{Duration, SystemTime};
+
+use anyhow::{anyhow, bail, Result};
+use log::*;
+use serde::{Deserialize, Serialize};
+
+use crate::config::{RuntimeConfigConsul, RuntimeConfigStun};
+use crate::consul;
+
+/// If autodiscovery returns None but an address was obtained less than
+/// this number of seconds ago (here 15 minutes), we keep that address
+/// in the Consul db instead of insterting a None.
+const PERSIST_SOME_RESULT_DURATION_SECS: u64 = 900;
+
+pub struct StunActor {
+    consul: consul::Consul,
+    refresh_time: Duration,
+
+    autodiscovery_v4: StunAutodiscovery,
+    autodiscovery_v6: StunAutodiscovery,
+}
+
+pub struct StunAutodiscovery {
+    consul_key: String,
+    is_ipv4: bool,
+    stun_server: Option<SocketAddr>,
+    last_result: Option<AutodiscoverResult>,
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+pub struct AutodiscoverResult {
+    pub timestamp: u64,
+    pub address: Option<IpAddr>,
+}
+
+impl StunActor {
+    pub fn new(
+        consul_config: &RuntimeConfigConsul,
+        stun_config: &RuntimeConfigStun,
+        node: &str,
+    ) -> Self {
+        assert!(stun_config
+            .stun_server_v4
+            .map(|x| x.is_ipv4())
+            .unwrap_or(true));
+        assert!(stun_config.stun_server_v6.is_ipv6());
+
+        let autodiscovery_v4 = StunAutodiscovery {
+            consul_key: format!("diplonat/autodiscovery/ipv4/{}", node),
+            is_ipv4: true,
+            stun_server: stun_config.stun_server_v4,
+            last_result: None,
+        };
+
+        let autodiscovery_v6 = StunAutodiscovery {
+            consul_key: format!("diplonat/autodiscovery/ipv6/{}", node),
+            is_ipv4: false,
+            stun_server: Some(stun_config.stun_server_v6),
+            last_result: None,
+        };
+
+        Self {
+            consul: consul::Consul::new(consul_config),
+            autodiscovery_v4,
+            autodiscovery_v6,
+            refresh_time: stun_config.refresh_time,
+        }
+    }
+
+    pub async fn listen(&mut self) -> Result<()> {
+        loop {
+            if let Err(e) = self.autodiscovery_v4.do_iteration(&self.consul).await {
+                error!("Unable to autodiscover IPv4 address: {}", e);
+            }
+
+            if let Err(e) = self.autodiscovery_v6.do_iteration(&self.consul).await {
+                error!("Unable to autodiscover IPv6 address: {}", e);
+            }
+            tokio::time::sleep(self.refresh_time).await;
+        }
+    }
+}
+
+impl StunAutodiscovery {
+    async fn do_iteration(&mut self, consul: &consul::Consul) -> Result<()> {
+        let binding_ip = match self.is_ipv4 {
+            true => IpAddr::V4(Ipv4Addr::UNSPECIFIED),  // 0.0.0.0
+            false => IpAddr::V6(Ipv6Addr::UNSPECIFIED), // [::]
+        };
+        let binding_addr = SocketAddr::new(binding_ip, 0);
+
+        let discovered_addr = match self.stun_server {
+            Some(stun_server) => {
+                assert_eq!(self.is_ipv4, stun_server.is_ipv4());
+
+                get_mapped_addr(stun_server, binding_addr)
+                    .await?
+                    .map(|x| x.ip())
+            }
+            None => None,
+        };
+
+        let now = timestamp();
+
+        if discovered_addr.is_none() {
+            if let Some(last_result) = &self.last_result {
+                if last_result.address.is_some()
+                    && now - last_result.timestamp <= PERSIST_SOME_RESULT_DURATION_SECS
+                {
+                    // Keep non-None result that was obtained before by not
+                    // writing/taking into account None result.
+                    return Ok(());
+                }
+            }
+        }
+
+        let current_result = AutodiscoverResult {
+            timestamp: now,
+            address: discovered_addr,
+        };
+
+        let msg = format!(
+            "STUN autodiscovery result: {} -> {:?}",
+            self.consul_key, discovered_addr
+        );
+        if self.last_result.as_ref().and_then(|x| x.address) != discovered_addr {
+            info!("{}", msg);
+        } else {
+            debug!("{}", msg);
+        }
+
+        consul
+            .kv_put(&self.consul_key, serde_json::to_vec(&current_result)?)
+            .await?;
+
+        self.last_result = Some(current_result);
+
+        Ok(())
+    }
+}
+
+async fn get_mapped_addr(
+    stun_server: SocketAddr,
+    binding_addr: SocketAddr,
+) -> Result<Option<SocketAddr>> {
+    use stun_client::*;
+
+    let mut client = Client::new(binding_addr, None).await?;
+    let res = match client.binding_request(stun_server, None).await {
+        Err(e) => {
+            info!(
+                "STUN binding request to {} failed, assuming no address (error: {})",
+                binding_addr, e
+            );
+            return Ok(None);
+        }
+        Ok(r) => r,
+    };
+
+    if res.get_class() != Class::SuccessResponse {
+        bail!("STUN server did not responde with a success response");
+    }
+
+    let xor_mapped_addr = Attribute::get_xor_mapped_address(&res)
+        .ok_or(anyhow!("no XorMappedAddress found in STUN response"))?;
+
+    Ok(Some(xor_mapped_addr))
+}
+
+fn timestamp() -> u64 {
+    SystemTime::now()
+        .duration_since(SystemTime::UNIX_EPOCH)
+        .expect("clock error")
+        .as_secs()
+}