/*
* Copyright 2004 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#if defined(_MSC_VER) && _MSC_VER < 1300
#pragma warning(disable : 4786)
#endif
#include "rtc_base/socket_adapters.h"
#include <algorithm>
#include "absl/strings/match.h"
#include "absl/strings/string_view.h"
#include "rtc_base/buffer.h"
#include "rtc_base/byte_buffer.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/strings/string_builder.h"
#include "rtc_base/zero_memory.h"
namespace rtc {
BufferedReadAdapter::BufferedReadAdapter(Socket* socket, size_t size)
: AsyncSocketAdapter(socket),
buffer_size_(size),
data_len_(0),
buffering_(false) {
buffer_ = new char[buffer_size_];
}
BufferedReadAdapter::~BufferedReadAdapter() {
delete[] buffer_;
}
int BufferedReadAdapter::Send(const void* pv, size_t cb) {
if (buffering_) {
// TODO: Spoof error better; Signal Writeable
SetError(EWOULDBLOCK);
return -1;
}
return AsyncSocketAdapter::Send(pv, cb);
}
int BufferedReadAdapter::Recv(void* pv, size_t cb, int64_t* timestamp) {
if (buffering_) {
SetError(EWOULDBLOCK);
return -1;
}
size_t read = 0;
if (data_len_) {
read = std::min(cb, data_len_);
memcpy(pv, buffer_, read);
data_len_ -= read;
if (data_len_ > 0) {
memmove(buffer_, buffer_ + read, data_len_);
}
pv = static_cast<char*>(pv) + read;
cb -= read;
}
// FIX: If cb == 0, we won't generate another read event
int res = AsyncSocketAdapter::Recv(pv, cb, timestamp);
if (res >= 0) {
// Read from socket and possibly buffer; return combined length
return res + static_cast<int>(read);
}
if (read > 0) {
// Failed to read from socket, but still read something from buffer
return static_cast<int>(read);
}
// Didn't read anything; return error from socket
return res;
}
void BufferedReadAdapter::BufferInput(bool on) {
buffering_ = on;
}
void BufferedReadAdapter::OnReadEvent(Socket* socket) {
RTC_DCHECK(socket == GetSocket());
if (!buffering_) {
AsyncSocketAdapter::OnReadEvent(socket);
return;
}
if (data_len_ >= buffer_size_) {
RTC_LOG(LS_ERROR) << "Input buffer overflow";
RTC_DCHECK_NOTREACHED();
data_len_ = 0;
}
int len = AsyncSocketAdapter::Recv(buffer_ + data_len_,
buffer_size_ - data_len_, nullptr);
if (len < 0) {
// TODO: Do something better like forwarding the error to the user.
RTC_LOG_ERR(LS_INFO) << "Recv";
return;
}
data_len_ += len;
ProcessInput(buffer_, &data_len_);
}
///////////////////////////////////////////////////////////////////////////////
// This is a SSL v2 CLIENT_HELLO message.
// TODO: Should this have a session id? The response doesn't have a
// certificate, so the hello should have a session id.
static const uint8_t kSslClientHello[] = {
0x80, 0x46, // msg len
0x01, // CLIENT_HELLO
0x03, 0x01, // SSL 3.1
0x00, 0x2d, // ciphersuite len
0x00, 0x00, // session id len
0x00, 0x10, // challenge len
0x01, 0x00, 0x80, 0x03, 0x00, 0x80, 0x07, 0x00, 0xc0, // ciphersuites
0x06, 0x00, 0x40, 0x02, 0x00, 0x80, 0x04, 0x00, 0x80, //
0x00, 0x00, 0x04, 0x00, 0xfe, 0xff, 0x00, 0x00, 0x0a, //
0x00, 0xfe, 0xfe, 0x00, 0x00, 0x09, 0x00, 0x00, 0x64, //
0x00, 0x00, 0x62, 0x00, 0x00, 0x03, 0x00, 0x00, 0x06, //
0x1f, 0x17, 0x0c, 0xa6, 0x2f, 0x00, 0x78, 0xfc, // challenge
0x46, 0x55, 0x2e, 0xb1, 0x83, 0x39, 0xf1, 0xea //
};
// static
ArrayView<const uint8_t> AsyncSSLSocket::SslClientHello() {
// Implicit conversion directly from kSslClientHello to ArrayView fails when
// built with gcc.
return {kSslClientHello, sizeof(kSslClientHello)};
}
// This is a TLSv1 SERVER_HELLO message.
static const uint8_t kSslServerHello[] = {
0x16, // handshake message
0x03, 0x01, // SSL 3.1
0x00, 0x4a, // message len
0x02, // SERVER_HELLO
0x00, 0x00, 0x46, // handshake len
0x03, 0x01, // SSL 3.1
0x42, 0x85, 0x45, 0xa7, 0x27, 0xa9, 0x5d, 0xa0, // server random
0xb3, 0xc5, 0xe7, 0x53, 0xda, 0x48, 0x2b, 0x3f, //
0xc6, 0x5a, 0xca, 0x89, 0xc1, 0x58, 0x52, 0xa1, //
0x78, 0x3c, 0x5b, 0x17, 0x46, 0x00, 0x85, 0x3f, //
0x20, // session id len
0x0e, 0xd3, 0x06, 0x72, 0x5b, 0x5b, 0x1b, 0x5f, // session id
0x15, 0xac, 0x13, 0xf9, 0x88, 0x53, 0x9d, 0x9b, //
0xe8, 0x3d, 0x7b, 0x0c, 0x30, 0x32, 0x6e, 0x38, //
0x4d, 0xa2, 0x75, 0x57, 0x41, 0x6c, 0x34, 0x5c, //
0x00, 0x04, // RSA/RC4-128/MD5
0x00 // null compression
};
// static
ArrayView<const uint8_t> AsyncSSLSocket::SslServerHello() {
return {kSslServerHello, sizeof(kSslServerHello)};
}
AsyncSSLSocket::AsyncSSLSocket(Socket* socket)
: BufferedReadAdapter(socket, 1024) {}
int AsyncSSLSocket::Connect(const SocketAddress& addr) {
// Begin buffering before we connect, so that there isn't a race condition
// between potential senders and receiving the OnConnectEvent signal
BufferInput(true);
return BufferedReadAdapter::Connect(addr);
}
void AsyncSSLSocket::OnConnectEvent(Socket* socket) {
RTC_DCHECK(socket == GetSocket());
// TODO: we could buffer output too...
const int res = DirectSend(kSslClientHello, sizeof(kSslClientHello));
if (res != sizeof(kSslClientHello)) {
RTC_LOG(LS_ERROR) << "Sending fake SSL ClientHello message failed.";
Close();
SignalCloseEvent(this, 0);
}
}
void AsyncSSLSocket::ProcessInput(char* data, size_t* len) {
if (*len < sizeof(kSslServerHello))
return;
if (memcmp(kSslServerHello, data, sizeof(kSslServerHello)) != 0) {
RTC_LOG(LS_ERROR) << "Received non-matching fake SSL ServerHello message.";
Close();
SignalCloseEvent(this, 0); // TODO: error code?
return;
}
*len -= sizeof(kSslServerHello);
if (*len > 0) {
memmove(data, data + sizeof(kSslServerHello), *len);
}
bool remainder = (*len > 0);
BufferInput(false);
SignalConnectEvent(this);
// FIX: if SignalConnect causes the socket to be destroyed, we are in trouble
if (remainder)
SignalReadEvent(this);
}
} // namespace rtc