1 files changed, 187 insertions, 0 deletions
diff --git a/security/nss/gtests/ssl_gtest/test_io.h b/security/nss/gtests/ssl_gtest/test_io.h
new file mode 100644
index 0000000000..e262fb123e
--- /dev/null
+++ b/security/nss/gtests/ssl_gtest/test_io.h
@@ -0,0 +1,187 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef test_io_h_
+#define test_io_h_
+
+#include <string.h>
+#include <map>
+#include <memory>
+#include <ostream>
+#include <queue>
+#include <string>
+
+#include "databuffer.h"
+#include "dummy_io.h"
+#include "prio.h"
+#include "nss_scoped_ptrs.h"
+#include "sslt.h"
+
+namespace nss_test {
+
+class DataBuffer;
+class DummyPrSocket;  // Fwd decl.
+
+// Allow us to inspect a packet before it is written.
+class PacketFilter {
+ public:
+  enum Action {
+    KEEP,    // keep the original packet unmodified
+    CHANGE,  // change the packet to a different value
+    DROP     // drop the packet
+  };
+  explicit PacketFilter(bool on = true) : enabled_(on) {}
+  virtual ~PacketFilter() {}
+
+  bool enabled() const { return enabled_; }
+
+  virtual Action Process(const DataBuffer& input, DataBuffer* output) {
+    if (!enabled_) {
+      return KEEP;
+    }
+    return Filter(input, output);
+  }
+  void Enable() { enabled_ = true; }
+  void Disable() { enabled_ = false; }
+
+  // The packet filter takes input and has the option of mutating it.
+  //
+  // A filter that modifies the data places the modified data in *output and
+  // returns CHANGE.  A filter that does not modify data returns LEAVE, in which
+  // case the value in *output is ignored.  A Filter can return DROP, in which
+  // case the packet is dropped (and *output is ignored).
+  virtual Action Filter(const DataBuffer& input, DataBuffer* output) = 0;
+
+ private:
+  bool enabled_;
+};
+
+class DummyPrSocket : public DummyIOLayerMethods {
+ public:
+  DummyPrSocket(const std::string& name, SSLProtocolVariant var)
+      : name_(name),
+        variant_(var),
+        peer_(),
+        input_(),
+        filter_(nullptr),
+        write_error_(0) {}
+  virtual ~DummyPrSocket() {}
+
+  static PRDescIdentity LayerId();
+
+  // Create a file descriptor that will reference this object.  The fd must not
+  // live longer than this adapter; call PR_Close() before.
+  ScopedPRFileDesc CreateFD();
+
+  std::weak_ptr<DummyPrSocket>& peer() { return peer_; }
+  void SetPeer(const std::shared_ptr<DummyPrSocket>& p) { peer_ = p; }
+  void SetPacketFilter(const std::shared_ptr<PacketFilter>& filter) {
+    filter_ = filter;
+  }
+  // Drops peer, packet filter and any outstanding packets.
+  void Reset();
+
+  void PacketReceived(const DataBuffer& data);
+  int32_t Read(PRFileDesc* f, void* data, int32_t len) override;
+  int32_t Recv(PRFileDesc* f, void* buf, int32_t buflen, int32_t flags,
+               PRIntervalTime to) override;
+  int32_t Write(PRFileDesc* f, const void* buf, int32_t length) override;
+  void SetWriteError(PRErrorCode code) { write_error_ = code; }
+
+  SSLProtocolVariant variant() const { return variant_; }
+  bool readable() const { return !input_.empty(); }
+
+ private:
+  class Packet : public DataBuffer {
+   public:
+    Packet(const DataBuffer& buf) : DataBuffer(buf), offset_(0) {}
+
+    void Advance(size_t delta) {
+      PR_ASSERT(offset_ + delta <= len());
+      offset_ = std::min(len(), offset_ + delta);
+    }
+
+    size_t offset() const { return offset_; }
+    size_t remaining() const { return len() - offset_; }
+
+   private:
+    size_t offset_;
+  };
+
+  const std::string name_;
+  SSLProtocolVariant variant_;
+  std::weak_ptr<DummyPrSocket> peer_;
+  std::queue<Packet> input_;
+  std::shared_ptr<PacketFilter> filter_;
+  PRErrorCode write_error_;
+};
+
+// Marker interface.
+class PollTarget {};
+
+enum Event { READABLE_EVENT, TIMER_EVENT /* Must be last */ };
+
+typedef void (*PollCallback)(PollTarget*, Event);
+
+class Poller {
+ public:
+  static Poller* Instance();  // Get a singleton.
+  static void Shutdown();     // Shut it down.
+
+  class Timer {
+   public:
+    Timer(PRTime deadline, PollTarget* target, PollCallback callback)
+        : deadline_(deadline), target_(target), callback_(callback) {}
+    void Cancel() { callback_ = nullptr; }
+
+    PRTime deadline_;
+    PollTarget* target_;
+    PollCallback callback_;
+  };
+
+  void Wait(Event event, std::shared_ptr<DummyPrSocket>& adapter,
+            PollTarget* target, PollCallback cb);
+  void Cancel(Event event, std::shared_ptr<DummyPrSocket>& adapter);
+  void SetTimer(uint32_t timer_ms, PollTarget* target, PollCallback cb,
+                std::shared_ptr<Timer>* handle);
+  bool Poll();
+
+ private:
+  Poller() : waiters_(), timers_() {}
+  ~Poller() {}
+
+  class Waiter {
+   public:
+    Waiter(std::shared_ptr<DummyPrSocket> io) : io_(io) {
+      memset(&targets_[0], 0, sizeof(targets_));
+      memset(&callbacks_[0], 0, sizeof(callbacks_));
+    }
+
+    void WaitFor(Event event, PollCallback callback);
+
+    std::shared_ptr<DummyPrSocket> io_;
+    PollTarget* targets_[TIMER_EVENT];
+    PollCallback callbacks_[TIMER_EVENT];
+  };
+
+  class TimerComparator {
+   public:
+    bool operator()(const std::shared_ptr<Timer> lhs,
+                    const std::shared_ptr<Timer> rhs) {
+      return lhs->deadline_ > rhs->deadline_;
+    }
+  };
+
+  static Poller* instance;
+  std::map<std::shared_ptr<DummyPrSocket>, std::unique_ptr<Waiter>> waiters_;
+  std::priority_queue<std::shared_ptr<Timer>,
+                      std::vector<std::shared_ptr<Timer>>, TimerComparator>
+      timers_;
+};
+
+}  // namespace nss_test
+
+#endif