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// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
#ifndef SRC_NODE_CRYPTO_BIO_H_
#define SRC_NODE_CRYPTO_BIO_H_
#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
#include "node_crypto.h"
#include "openssl/bio.h"
#include "env-inl.h"
#include "util-inl.h"
#include "v8.h"
namespace node {
namespace crypto {
// This class represents buffers for OpenSSL I/O, implemented as a singly-linked
// list of chunks. It can be used either for writing data from Node to OpenSSL,
// or for reading data back, but not both.
// The structure is only accessed, and owned by, the OpenSSL BIOPointer
// (a.k.a. std::unique_ptr<BIO>).
class NodeBIO : public MemoryRetainer {
public:
~NodeBIO();
static BIOPointer New(Environment* env = nullptr);
// NewFixed takes a copy of `len` bytes from `data` and returns a BIO that,
// when read from, returns those bytes followed by EOF.
static BIOPointer NewFixed(const char* data, size_t len,
Environment* env = nullptr);
// Move read head to next buffer if needed
void TryMoveReadHead();
// Allocate new buffer for write if needed
void TryAllocateForWrite(size_t hint);
// Read `len` bytes maximum into `out`, return actual number of read bytes
size_t Read(char* out, size_t size);
// Memory optimization:
// Deallocate children of write head's child if they're empty
void FreeEmpty();
// Return pointer to internal data and amount of
// contiguous data available to read
char* Peek(size_t* size);
// Return pointers and sizes of multiple internal data chunks available for
// reading
size_t PeekMultiple(char** out, size_t* size, size_t* count);
// Find first appearance of `delim` in buffer or `limit` if `delim`
// wasn't found.
size_t IndexOf(char delim, size_t limit);
// Discard all available data
void Reset();
// Put `len` bytes from `data` into buffer
void Write(const char* data, size_t size);
// Return pointer to contiguous block of reserved data and the size available
// for future writes. Call Commit() once the write is complete.
char* PeekWritable(size_t* size);
// Specify how much data was written into the block returned by
// PeekWritable().
void Commit(size_t size);
// Return size of buffer in bytes
inline size_t Length() const {
return length_;
}
inline void set_eof_return(int num) {
eof_return_ = num;
}
inline int eof_return() {
return eof_return_;
}
inline void set_initial(size_t initial) {
initial_ = initial;
}
static NodeBIO* FromBIO(BIO* bio);
void MemoryInfo(MemoryTracker* tracker) const override {
tracker->TrackFieldWithSize("buffer", length_, "NodeBIO::Buffer");
}
SET_MEMORY_INFO_NAME(NodeBIO)
SET_SELF_SIZE(NodeBIO)
private:
static int New(BIO* bio);
static int Free(BIO* bio);
static int Read(BIO* bio, char* out, int len);
static int Write(BIO* bio, const char* data, int len);
static int Puts(BIO* bio, const char* str);
static int Gets(BIO* bio, char* out, int size);
static long Ctrl(BIO* bio, int cmd, long num, // NOLINT(runtime/int)
void* ptr);
static const BIO_METHOD* GetMethod();
// Enough to handle the most of the client hellos
static const size_t kInitialBufferLength = 1024;
static const size_t kThroughputBufferLength = 16384;
class Buffer {
public:
Buffer(Environment* env, size_t len) : env_(env),
read_pos_(0),
write_pos_(0),
len_(len),
next_(nullptr) {
data_ = new char[len];
if (env_ != nullptr)
env_->isolate()->AdjustAmountOfExternalAllocatedMemory(len);
}
~Buffer() {
delete[] data_;
if (env_ != nullptr) {
const int64_t len = static_cast<int64_t>(len_);
env_->isolate()->AdjustAmountOfExternalAllocatedMemory(-len);
}
}
Environment* env_;
size_t read_pos_;
size_t write_pos_;
size_t len_;
Buffer* next_;
char* data_;
};
Environment* env_ = nullptr;
size_t initial_ = kInitialBufferLength;
size_t length_ = 0;
int eof_return_ = -1;
Buffer* read_head_ = nullptr;
Buffer* write_head_ = nullptr;
friend void node::crypto::InitCryptoOnce();
};
} // namespace crypto
} // namespace node
#endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
#endif // SRC_NODE_CRYPTO_BIO_H_
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