feat(dgw): emit syslogs and Windows events for important events

Issue: DGW-63
Security: yes

Author: CBenoit

.cargo/mutants.toml

@@ -0,0 +1,2 @@
+skip_calls = ["emit_to_syslog", "emit_to_event_log"]
+exclude_re = ["impl Debug"]

Cargo.lock

@@ -6,6 +6,7 @@ members = [
     "devolutions-gateway",
     "devolutions-session",
     "jetsocat",
+    "testsuite",
     "tools/generate-openapi",
 ]
 default-members = [
@@ -36,6 +37,10 @@ strip = "symbols"
 tracing-appender = { git = "https://github.com/CBenoit/tracing.git", rev = "42097daf92e683cf18da7639ddccb056721a796c" }
 
 [workspace.lints.rust]
+# Declare the custom cfgs.
+unexpected_cfgs = { level = "warn", check-cfg = [
+  'cfg(build_profile, values("dev","release","production"))',
+]}
 
 # == Safer unsafe == #
 unsafe_op_in_unsafe_fn = "warn"
@@ -55,6 +60,9 @@ noop_method_call = "warn"
 unused_crate_dependencies = "warn"
 unused_macro_rules = "warn"
 
+[workspace.dependencies]
+proptest = "1.0"
+
 [workspace.lints.clippy]
 
 # == Safer unsafe == #

Cargo.toml

@@ -276,10 +276,8 @@ impl From<io::ErrorKind> for Socks5FailureCode {
         match kind {
             io::ErrorKind::ConnectionRefused => Socks5FailureCode::ConnectionRefused,
             io::ErrorKind::TimedOut => Socks5FailureCode::TtlExpired,
-            #[cfg(feature = "nightly")] // https://github.com/rust-lang/rust/issues/86442
-            std::io::ErrorKind::HostUnreachable => Socks5FailureCode::HostUnreachable,
-            #[cfg(feature = "nightly")] // https://github.com/rust-lang/rust/issues/86442
-            std::io::ErrorKind::NetworkUnreachable => Socks5FailureCode::NetworkUnreachable,
+            io::ErrorKind::HostUnreachable => Socks5FailureCode::HostUnreachable,
+            io::ErrorKind::NetworkUnreachable => Socks5FailureCode::NetworkUnreachable,
             _ => Socks5FailureCode::GeneralSocksServerFailure,
         }
     }

crates/proxy-socks/src/socks5.rs

@@ -0,0 +1,13 @@
+[package]
+name = "sysevent-codes"
+version = "0.0.0"
+edition = "2024"
+authors = ["Devolutions Inc. <infos@devolutions.net>"]
+license = "MIT OR Apache-2.0"
+publish = false
+
+[lints]
+workspace = true
+
+[dependencies]
+sysevent.path = "../sysevent"