ci: add workflow for rust bench crate (#4210)

The bench crate contains interop testing that would be useful to have in
our ci runs. This commit adds a github workflow to run that. It also
adds an options to generate the bindings without running the tests,
since the tests take several minutes to run.

.github/workflows/ci_rust.yml

@@ -59,6 +59,29 @@ jobs:
           ./generate.sh
           ldd target/debug/integration | grep libs2n.so
 
+  # our benchmark testing includes interop tests between s2n-tls, rustls, and
+  # openssl
+  harness-interop-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: actions-rs/toolchain@v1
+        id: toolchain
+        with:
+          toolchain: stable
+          override: true
+
+      - name: generate bindings
+        run: ${{env.ROOT_PATH}}/generate.sh --skip-tests
+
+      - name: generate test certs
+        run: ${{env.ROOT_PATH}}/bench/scripts/generate-certs.sh
+
+      - name: bench tests
+        working-directory: ${{env.ROOT_PATH}}/bench
+        run: cargo test
+
   generate-openssl-102:
     runs-on: ubuntu-latest
     steps:

bindings/rust/bench/scripts/generate-certs.sh

@@ -11,6 +11,7 @@
 set -e
 
 # go to directory certs are located
+mkdir -p "$(dirname "$0")"/../certs
 pushd "$(dirname "$0")"/../certs > /dev/null
 
 # Generates certs with given algorithms and bits in $1$2/, ex. ec384/

bindings/rust/bench/src/s2n_tls.rs

@@ -29,10 +29,10 @@ use std::{
 
 /// Custom callback for verifying hostnames. Rustls requires checking hostnames,
 /// so this is to make a fair comparison
-struct HostNameHandler<'a> {
-    expected_server_name: &'a str,
+struct HostNameHandler {
+    expected_server_name: &'static str,
 }
-impl VerifyHostNameCallback for HostNameHandler<'_> {
+impl VerifyHostNameCallback for HostNameHandler {
     fn verify_host_name(&self, hostname: &str) -> bool {
         self.expected_server_name == hostname
     }

bindings/rust/generate.sh

@@ -38,6 +38,11 @@ pushd generate
 cargo run -- ../s2n-tls-sys
 popd
 
+if [ "$1" == "--skip-tests" ]; then
+    echo "skipping tests"
+    exit;
+fi;
+
 # make sure everything builds and passes sanity checks
 pushd s2n-tls-sys
 cargo test