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/*
* Copyright (C) 2015 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "socket.h"
#ifndef _WIN32
#include <sys/select.h>
#endif
#include <android-base/errors.h>
#include <android-base/stringprintf.h>
Socket::Socket(cutils_socket_t sock) : sock_(sock) {}
Socket::~Socket() {
Close();
}
int Socket::Close() {
int ret = 0;
if (sock_ != INVALID_SOCKET) {
ret = socket_close(sock_);
sock_ = INVALID_SOCKET;
}
return ret;
}
ssize_t Socket::ReceiveAll(void* data, size_t length, int timeout_ms) {
size_t total = 0;
while (total < length) {
ssize_t bytes = Receive(reinterpret_cast<char*>(data) + total, length - total, timeout_ms);
// Returns 0 only when the peer has disconnected because our requested length is not 0. So
// we return immediately to avoid dead loop here.
if (bytes <= 0) {
if (total == 0) {
return -1;
}
break;
}
total += bytes;
}
return total;
}
int Socket::GetLocalPort() {
return socket_get_local_port(sock_);
}
// According to Windows setsockopt() documentation, if a Windows socket times out during send() or
// recv() the state is indeterminate and should not be used. Our UDP protocol relies on being able
// to re-send after a timeout, so we must use select() rather than SO_RCVTIMEO.
// See https://msdn.microsoft.com/en-us/library/windows/desktop/ms740476(v=vs.85).aspx.
bool Socket::WaitForRecv(int timeout_ms) {
receive_timed_out_ = false;
// In our usage |timeout_ms| <= 0 means block forever, so just return true immediately and let
// the subsequent recv() do the blocking.
if (timeout_ms <= 0) {
return true;
}
// select() doesn't always check this case and will block for |timeout_ms| if we let it.
if (sock_ == INVALID_SOCKET) {
return false;
}
fd_set read_set;
FD_ZERO(&read_set);
FD_SET(sock_, &read_set);
timeval timeout;
timeout.tv_sec = timeout_ms / 1000;
timeout.tv_usec = (timeout_ms % 1000) * 1000;
int result = TEMP_FAILURE_RETRY(select(sock_ + 1, &read_set, nullptr, nullptr, &timeout));
if (result == 0) {
receive_timed_out_ = true;
}
return result == 1;
}
// Implements the Socket interface for UDP.
class UdpSocket : public Socket {
public:
enum class Type { kClient, kServer };
UdpSocket(Type type, cutils_socket_t sock);
bool Send(const void* data, size_t length) override;
bool Send(std::vector<cutils_socket_buffer_t> buffers) override;
ssize_t Receive(void* data, size_t length, int timeout_ms) override;
private:
std::unique_ptr<sockaddr_storage> addr_;
socklen_t addr_size_ = 0;
DISALLOW_COPY_AND_ASSIGN(UdpSocket);
};
UdpSocket::UdpSocket(Type type, cutils_socket_t sock) : Socket(sock) {
// Only servers need to remember addresses; clients are connected to a server in NewClient()
// so will send to that server without needing to specify the address again.
if (type == Type::kServer) {
addr_.reset(new sockaddr_storage);
addr_size_ = sizeof(*addr_);
memset(addr_.get(), 0, addr_size_);
}
}
bool UdpSocket::Send(const void* data, size_t length) {
return TEMP_FAILURE_RETRY(sendto(sock_, reinterpret_cast<const char*>(data), length, 0,
reinterpret_cast<sockaddr*>(addr_.get()), addr_size_)) ==
static_cast<ssize_t>(length);
}
bool UdpSocket::Send(std::vector<cutils_socket_buffer_t> buffers) {
size_t total_length = 0;
for (const auto& buffer : buffers) {
total_length += buffer.length;
}
return TEMP_FAILURE_RETRY(socket_send_buffers_function_(
sock_, buffers.data(), buffers.size())) == static_cast<ssize_t>(total_length);
}
ssize_t UdpSocket::Receive(void* data, size_t length, int timeout_ms) {
if (!WaitForRecv(timeout_ms)) {
return -1;
}
socklen_t* addr_size_ptr = nullptr;
if (addr_ != nullptr) {
// Reset addr_size as it may have been modified by previous recvfrom() calls.
addr_size_ = sizeof(*addr_);
addr_size_ptr = &addr_size_;
}
return TEMP_FAILURE_RETRY(recvfrom(sock_, reinterpret_cast<char*>(data), length, 0,
reinterpret_cast<sockaddr*>(addr_.get()), addr_size_ptr));
}
// Implements the Socket interface for TCP.
class TcpSocket : public Socket {
public:
explicit TcpSocket(cutils_socket_t sock) : Socket(sock) {}
bool Send(const void* data, size_t length) override;
bool Send(std::vector<cutils_socket_buffer_t> buffers) override;
ssize_t Receive(void* data, size_t length, int timeout_ms) override;
std::unique_ptr<Socket> Accept() override;
private:
DISALLOW_COPY_AND_ASSIGN(TcpSocket);
};
bool TcpSocket::Send(const void* data, size_t length) {
while (length > 0) {
ssize_t sent =
TEMP_FAILURE_RETRY(send(sock_, reinterpret_cast<const char*>(data), length, 0));
if (sent == -1) {
return false;
}
length -= sent;
}
return true;
}
bool TcpSocket::Send(std::vector<cutils_socket_buffer_t> buffers) {
while (!buffers.empty()) {
ssize_t sent = TEMP_FAILURE_RETRY(
socket_send_buffers_function_(sock_, buffers.data(), buffers.size()));
if (sent == -1) {
return false;
}
// Adjust the buffers to skip past the bytes we've just sent.
auto iter = buffers.begin();
while (sent > 0) {
if (iter->length > static_cast<size_t>(sent)) {
// Incomplete buffer write; adjust the buffer to point to the next byte to send.
iter->length -= sent;
iter->data = reinterpret_cast<const char*>(iter->data) + sent;
break;
}
// Complete buffer write; move on to the next buffer.
sent -= iter->length;
++iter;
}
// Shortcut the common case: we've written everything remaining.
if (iter == buffers.end()) {
break;
}
buffers.erase(buffers.begin(), iter);
}
return true;
}
ssize_t TcpSocket::Receive(void* data, size_t length, int timeout_ms) {
if (!WaitForRecv(timeout_ms)) {
return -1;
}
return TEMP_FAILURE_RETRY(recv(sock_, reinterpret_cast<char*>(data), length, 0));
}
std::unique_ptr<Socket> TcpSocket::Accept() {
cutils_socket_t handler = accept(sock_, nullptr, nullptr);
if (handler == INVALID_SOCKET) {
return nullptr;
}
return std::unique_ptr<TcpSocket>(new TcpSocket(handler));
}
std::unique_ptr<Socket> Socket::NewClient(Protocol protocol, const std::string& host, int port,
std::string* error) {
if (protocol == Protocol::kUdp) {
cutils_socket_t sock = socket_network_client(host.c_str(), port, SOCK_DGRAM);
if (sock != INVALID_SOCKET) {
return std::unique_ptr<UdpSocket>(new UdpSocket(UdpSocket::Type::kClient, sock));
}
} else {
cutils_socket_t sock = socket_network_client(host.c_str(), port, SOCK_STREAM);
if (sock != INVALID_SOCKET) {
return std::unique_ptr<TcpSocket>(new TcpSocket(sock));
}
}
if (error) {
*error = android::base::StringPrintf("Failed to connect to %s:%d", host.c_str(), port);
}
return nullptr;
}
// This functionality is currently only used by tests so we don't need any error messages.
std::unique_ptr<Socket> Socket::NewServer(Protocol protocol, int port) {
if (protocol == Protocol::kUdp) {
cutils_socket_t sock = socket_inaddr_any_server(port, SOCK_DGRAM);
if (sock != INVALID_SOCKET) {
return std::unique_ptr<UdpSocket>(new UdpSocket(UdpSocket::Type::kServer, sock));
}
} else {
cutils_socket_t sock = socket_inaddr_any_server(port, SOCK_STREAM);
if (sock != INVALID_SOCKET) {
return std::unique_ptr<TcpSocket>(new TcpSocket(sock));
}
}
return nullptr;
}
std::string Socket::GetErrorMessage() {
#if defined(_WIN32)
DWORD error_code = WSAGetLastError();
#else
int error_code = errno;
#endif
return android::base::SystemErrorCodeToString(error_code);
}