Add documentation

test/core/bad_ssl/server.c

@@ -38,6 +38,11 @@
 #include "test/core/bad_ssl/server.h"
 #include "test/core/util/test_config.h"
 
+/* Common server implementation details for all servers in servers/.
+ * There's nothing *wrong* with these servers per-se, but they are
+ * configured to cause some failure case in the SSL connection path.
+ */
+
 static int got_sigint = 0;
 
 static void sigint_handler(int x) { got_sigint = 1; }

test/core/bad_ssl/servers/alpn.c

@@ -38,9 +38,14 @@
 #include <grpc/support/log.h>
 #include <grpc/support/useful.h>
 
+#include "src/core/transport/chttp2/alpn.h"
 #include "test/core/bad_ssl/server.h"
 #include "test/core/end2end/data/ssl_test_data.h"
 
+/* This test starts a server that is configured to advertise (via alpn and npn)
+ * a protocol that the connecting client does not support. It does this by
+ * overriding the functions declared in alpn.c from the core library. */
+
 static const char *const fake_versions[] = {"not-h2"};
 
 int grpc_chttp2_is_alpn_version_supported(const char *version, size_t size) {

test/core/bad_ssl/servers/cert.c

@@ -43,6 +43,9 @@
 #include "test/core/bad_ssl/server.h"
 #include "test/core/end2end/data/ssl_test_data.h"
 
+/* This server will present an untrusted cert to the connecting client,
+ * causing the SSL handshake to fail */
+
 int main(int argc, char **argv) {
   const char *addr = bad_ssl_addr(argc, argv);
   grpc_ssl_pem_key_cert_pair pem_key_cert_pair;