Interop test against PuTTY snapshot and releases.

.github/configs

@@ -164,6 +164,11 @@ case "$config" in
     libressl-*)
 	LIBCRYPTOFLAGS="--with-ssl-dir=/opt/libressl --with-rpath=-Wl,-rpath,"
 	;;
+    putty-*)
+	CONFIGFLAGS="--with-plink=/usr/local/bin/plink --with-puttygen=/usr/local/bin/puttygen"
+	# We don't need to rerun the regular tests, just the interop ones.
+	TEST_TARGET=interop-tests
+	;;
     openssl-*)
 	LIBCRYPTOFLAGS="--with-ssl-dir=/opt/openssl --with-rpath=-Wl,-rpath,"
 	# OpenSSL 1.1.1 specifically has a bug in its RNG that breaks reexec

.github/setup_ci.sh

@@ -142,6 +142,10 @@ for TARGET in $TARGETS; do
         INSTALL_BORINGSSL=1
         PACKAGES="${PACKAGES} cmake ninja-build"
        ;;
+    putty-*)
+	INSTALL_PUTTY=$(echo "${TARGET}" | cut -f2 -d-)
+	PACKAGES="${PACKAGES} cmake"
+	;;
     valgrind*)
        PACKAGES="$PACKAGES valgrind"
        ;;
@@ -241,3 +245,25 @@ if [ ! -z "${INSTALL_ZLIB}" ]; then
      cd ${HOME}/zlib && ./configure && make &&
      sudo make install prefix=/opt/zlib)
 fi
+
+if [ ! -z "${INSTALL_PUTTY}" ]; then
+    ver="${INSTALL_PUTTY}"
+    case "${INSTALL_PUTTY}" in
+    snapshot)
+	tarball=putty.tar.gz
+	(cd /tmp && wget https://tartarus.org/~simon/putty-snapshots/${tarball})
+	;;
+    *)
+	tarball=putty-${ver}.tar.gz
+	(cd /tmp && wget https://the.earth.li/~sgtatham/putty/${ver}/${tarball})
+	;;
+    esac
+    (cd ${HOME} && tar xfz /tmp/${tarball} && cd putty-*
+     if [ -f CMakeLists.txt ]; then
+	cmake . && cmake --build . && sudo cmake --build . --target install
+     else
+	./configure && make && sudo make install
+     fi
+    )
+    /usr/local/bin/plink -V
+fi

.github/workflows/c-cpp.yml

@@ -76,6 +76,17 @@ jobs:
           - { target: ubuntu-latest, config: openssl-1.1.1_stable }
           - { target: ubuntu-latest, config: openssl-3.0 }  # stable branch
           - { target: ubuntu-latest, config: openssl-3.2 }  # stable branch
+          - { target: ubuntu-latest, config: putty-0.71 }
+          - { target: ubuntu-latest, config: putty-0.72 }
+          - { target: ubuntu-latest, config: putty-0.73 }
+          - { target: ubuntu-latest, config: putty-0.74 }
+          - { target: ubuntu-latest, config: putty-0.75 }
+          - { target: ubuntu-latest, config: putty-0.76 }
+          - { target: ubuntu-latest, config: putty-0.77 }
+          - { target: ubuntu-latest, config: putty-0.78 }
+          - { target: ubuntu-latest, config: putty-0.79 }
+          - { target: ubuntu-latest, config: putty-0.80 }
+          - { target: ubuntu-latest, config: putty-snapshot }
           - { target: ubuntu-latest, config: zlib-develop }
           - { target: ubuntu-22.04, config: pam }
           - { target: ubuntu-22.04, config: krb5 }