Port SSLClientSocket to Linux

net/base/nss_memio.h

+// Copyright (c) 2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+// Written in NSPR style to also be suitable for adding to the NSS demo suite
+
+#ifndef __MEMIO_H
+#define __MEMIO_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif 
+
+#include "prio.h"
+
+/* Opaque structure.  Really just a more typesafe alias for PRFilePrivate. */
+struct memio_Private;
+typedef struct memio_Private memio_Private;
+
+/*----------------------------------------------------------------------
+ NSPR I/O layer that terminates in a pair of circular buffers
+ rather than talking to the real network.
+ To use this with NSS:
+ 1) call memio_CreateIOLayer to create a fake NSPR socket
+ 2) call SSL_ImportFD to ssl-ify the socket
+ 3) Do your own networking calls to set up a TCP connection
+ 4) call memio_SetPeerName to tell NSS about the other end of the connection
+ 5) While at the same time doing plaintext nonblocking NSPR I/O as
+    usual to the nspr file descriptor returned by SSL_ImportFD,
+    your app must shuttle encrypted data between
+    the real network and memio's network buffers.  
+    memio_GetReadParams/memio_PutReadResult
+    are the hooks you need to pump data into memio's input buffer,
+    and memio_GetWriteParams/memio_PutWriteResult
+    are the hooks you need to pump data out of memio's output buffer.
+----------------------------------------------------------------------*/
+
+/* Create the I/O layer and its two circular buffers. */
+PRFileDesc *memio_CreateIOLayer(int bufsize);
+
+/* Must call before trying to make an ssl connection */
+void memio_SetPeerName(PRFileDesc *fd, const PRNetAddr *peername);
+
+/* Return a private pointer needed by the following
+ * four functions.  (We could have passed a PRFileDesc to
+ * them, but that would be slower.  Better for the caller
+ * to grab the pointer once and cache it.
+ * This may be a premature optimization.)
+ */
+memio_Private *memio_GetSecret(PRFileDesc *fd);
+
+/* Ask memio where to put bytes from the network, and how many it can handle.
+ * Returns bytes available to write, or 0 if none available.
+ * Puts current buffer position into *buf.
+ */
+int memio_GetReadParams(memio_Private *secret, char **buf);
+
+/* Tell memio how many bytes were read from the network.
+ * If bytes_read is 0, causes EOF to be reported to 
+ * NSS after it reads the last byte from the circular buffer.
+ * If bytes_read is < 0, it is treated as an NSPR error code.
+ * See nspr/pr/src/md/unix/unix_errors.c for how to
+ * map from Unix errors to NSPR error codes.
+ * On EWOULDBLOCK or the equivalent, don't call this function.
+ */
+void memio_PutReadResult(memio_Private *secret, int bytes_read);
+
+/* Ask memio what data it has to send to the network.
+ * Returns buffer space available to read into, or 0 if none available.
+ * Puts current buffer position into *buf.
+ */
+int memio_GetWriteParams(memio_Private *secret, const char **buf);
+
+/* Tell memio how many bytes were sent to the network.
+ * If bytes_written is < 0, it is treated as an NSPR error code.
+ * See nspr/pr/src/md/unix/unix_errors.c for how to
+ * map from Unix errors to NSPR error codes.
+ * On EWOULDBLOCK or the equivalent, don't call this function.
+ */
+void memio_PutWriteResult(memio_Private *secret, int bytes_written);
+
+
+#ifdef __cplusplus
+}
+#endif 
+
+#endif