socketadapters.cc

本人收集整理的一份c/c++跨平台网络库

#if defined(_MSC_VER) && _MSC_VER < 1300
#pragma warning(disable:4786)
#endif

#include <time.h>
#include <errno.h>

#ifdef WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#define _WINSOCKAPI_
#include <windows.h>
#define SECURITY_WIN32
#include <security.h>
#endif

#include "basicdefs.h"
#include "bytebuffer.h"
#include "common.h"
#include "httpcommon.h"
#include "logging.h"
#include "socketadapters.h"
#include "stringencode.h"
#include "stringutils.h"

#ifdef WIN32
#include "sec_buffer.h"
#endif // WIN32

namespace utils_base {

BufferedReadAdapter::BufferedReadAdapter(AsyncSocket* socket, size_t buffer_size)
  : AsyncSocketAdapter(socket), buffer_size_(buffer_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
    socket_->SetError(EWOULDBLOCK);
    return -1;
  }
  return AsyncSocketAdapter::Send(pv, cb);
}

int BufferedReadAdapter::Recv(void *pv, size_t cb) {
  if (buffering_) {
    socket_->SetError(EWOULDBLOCK);
    return -1;
  }

  size_t read = 0;

  if (data_len_) {
    read = _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);
  if (res < 0)
    return res;

  return res + static_cast<int>(read);
}

void BufferedReadAdapter::BufferInput(bool on) {
  buffering_ = on;
}

void BufferedReadAdapter::OnReadEvent(AsyncSocket * socket) {
  ASSERT(socket == socket_);

  if (!buffering_) {
    AsyncSocketAdapter::OnReadEvent(socket);
    return;
  }

  if (data_len_ >= buffer_size_) {
    LOG(INFO) << "Input buffer overflow";
    ASSERT(false);
    data_len_ = 0;
  }

  int len = socket_->Recv(buffer_ + data_len_, buffer_size_ - data_len_);
  if (len < 0) {
    // TODO: Do something better like forwarding the error to the user.
    LOG(INFO) << "Recv: " << errno << " " <<  std::strerror(errno);
    return;
  }

  data_len_ += len;

  ProcessInput(buffer_, data_len_);
}

///////////////////////////////////////////////////////////////////////////////

const uint8 SSL_SERVER_HELLO[] = {
  22,3,1,0,74,2,0,0,70,3,1,66,133,69,167,39,169,93,160,
  179,197,231,83,218,72,43,63,198,90,202,137,193,88,82,
  161,120,60,91,23,70,0,133,63,32,14,211,6,114,91,91,
  27,95,21,172,19,249,136,83,157,155,232,61,123,12,48,
  50,110,56,77,162,117,87,65,108,52,92,0,4,0
};

const char SSL_CLIENT_HELLO[] = {
  -128,70,1,3,1,0,45,0,0,0,16,1,0,-128,3,0,-128,7,0,-64,6,0,64,2,0,
  -128,4,0,-128,0,0,4,0,-2,-1,0,0,10,0,-2,-2,0,0,9,0,0,100,0,0,98,0,
  0,3,0,0,6,31,23,12,-90,47,0,120,-4,70,85,46,-79,-125,57,-15,-22
};

AsyncSSLSocket::AsyncSSLSocket(AsyncSocket* 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(AsyncSocket * socket) {
  ASSERT(socket == socket_);

  // TODO: we could buffer output too...
  int res = DirectSend(SSL_CLIENT_HELLO, sizeof(SSL_CLIENT_HELLO));
  ASSERT(res == sizeof(SSL_CLIENT_HELLO));
}

void AsyncSSLSocket::ProcessInput(char * data, size_t& len) {
  if (len < sizeof(SSL_SERVER_HELLO))
    return;

  if (memcmp(SSL_SERVER_HELLO, data, sizeof(SSL_SERVER_HELLO)) != 0) {
    Close();
    SignalCloseEvent(this, 0); // TODO: error code?
    return;
  }

  len -= sizeof(SSL_SERVER_HELLO);
  if (len > 0) {
    memmove(data, data + sizeof(SSL_SERVER_HELLO), 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);
}

///////////////////////////////////////////////////////////////////////////////

AsyncHttpsProxySocket::AsyncHttpsProxySocket(AsyncSocket* socket,
                                             const std::string& user_agent,
                                             const SocketAddress& proxy,
                                             const std::string& username,
                                             const CryptString& password)
  : BufferedReadAdapter(socket, 1024), proxy_(proxy), agent_(user_agent), 
    user_(username), pass_(password), state_(PS_ERROR), context_(0) {
}

AsyncHttpsProxySocket::~AsyncHttpsProxySocket() {
  delete context_;
}

int AsyncHttpsProxySocket::Connect(const SocketAddress& addr) {
  LOG(LS_VERBOSE) << "AsyncHttpsProxySocket::Connect("
                  << proxy_.ToString() << ")";
  dest_ = addr;
  if (dest_.port() != 80) {
    BufferInput(true);
  }
  return BufferedReadAdapter::Connect(proxy_);
}

SocketAddress AsyncHttpsProxySocket::GetRemoteAddress() const {
  return dest_;
}

int AsyncHttpsProxySocket::Close() {
  headers_.clear();
  state_ = PS_ERROR;
  delete context_;
  context_ = 0;
  return BufferedReadAdapter::Close();
}

void AsyncHttpsProxySocket::OnConnectEvent(AsyncSocket * socket) {
  LOG(LS_VERBOSE) << "AsyncHttpsProxySocket::OnConnectEvent";
  // TODO: Decide whether tunneling or not should be explicitly set,
  // or indicated by destination port (as below)
  if (dest_.port() == 80) {
    state_ = PS_TUNNEL;
    BufferedReadAdapter::OnConnectEvent(socket);
    return;
  }
  SendRequest();
}

void AsyncHttpsProxySocket::OnCloseEvent(AsyncSocket * socket, int err) {
  LOG(LS_VERBOSE) << "AsyncHttpsProxySocket::OnCloseEvent(" << err << ")";
  if ((state_ == PS_WAIT_CLOSE) && (err == 0)) {
    state_ = PS_ERROR;
    Connect(dest_);
  } else {
    BufferedReadAdapter::OnCloseEvent(socket, err);
  }
}

void AsyncHttpsProxySocket::ProcessInput(char * data, size_t& len) {
  size_t start = 0;
  for (size_t pos = start; (state_ < PS_TUNNEL) && (pos < len); ) {
    if (state_ == PS_SKIP_BODY) {
      size_t consume = _min(len - pos, content_length_);
      pos += consume;
      start = pos;
      content_length_ -= consume;
      if (content_length_ == 0) {
        EndResponse();
      }
      continue;
    }

    if (data[pos++] != '\n')
      continue;

    size_t len = pos - start - 1;
    if ((len > 0) && (data[start + len - 1] == '\r'))
      --len;

    data[start + len] = 0;
    ProcessLine(data + start, len);
    start = pos;
  }

  len -= start;
  if (len > 0) {
    memmove(data, data + start, len);
  }

  if (state_ != PS_TUNNEL)
    return;

  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); // TODO: signal this??
}

void AsyncHttpsProxySocket::SendRequest() {
  std::stringstream ss;
  ss << "CONNECT " << dest_.ToString() << " HTTP/1.0\r\n";
  ss << "User-Agent: " << agent_ << "\r\n";
  ss << "Host: " << dest_.IPAsString() << "\r\n";
  ss << "Content-Length: 0\r\n";
  ss << "Proxy-Connection: Keep-Alive\r\n";
  ss << headers_;
  ss << "\r\n";
  std::string str = ss.str();
  DirectSend(str.c_str(), str.size());
  state_ = PS_LEADER;
  expect_close_ = true;
  content_length_ = 0;
  headers_.clear();

  LOG(LS_VERBOSE) << "AsyncHttpsProxySocket >> " << str;
}

void AsyncHttpsProxySocket::ProcessLine(char * data, size_t len) {
  LOG(LS_VERBOSE) << "AsyncHttpsProxySocket << " << data;

  if (len == 0) {
    if (state_ == PS_TUNNEL_HEADERS) {
      state_ = PS_TUNNEL;
    } else if (state_ == PS_ERROR_HEADERS) {
      Error(defer_error_);
      return;
    } else if (state_ == PS_SKIP_HEADERS) {
      if (content_length_) {
        state_ = PS_SKIP_BODY;
      } else {
        EndResponse();
        return;
      }
    } else {
      static bool report = false;
      if (!unknown_mechanisms_.empty() && !report) {
        report = true;
        std::string msg(
          "Unable to connect to the Google Talk service due to an incompatibility "
          "with your proxy.\r\nPlease help us resolve this issue by submitting the "
          "following information to us using our technical issue submission form "
          "at:\r\n\r\n"
          "http://www.google.com/support/talk/bin/request.py\r\n\r\n"
          "We apologize for the inconvenience.\r\n\r\n"
          "Information to submit to Google: "
          );
        //std::string msg("Please report the following information to [e-mail]:\r\nUnknown methods: ");
        msg.append(unknown_mechanisms_);
#ifdef WIN32
        MessageBoxA(0, msg.c_str(), "Oops!", MB_OK);
#endif
#ifdef POSIX
        //TODO: Raise a signal or something so the UI can be separated.
        LOG(LS_ERROR) << "Oops!\n\n" << msg;
#endif
      }
      // Unexpected end of headers