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/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
#include <WinSock2.h>
#include <Ws2ipdef.h>
#include <Ws2tcpip.h>
#include <cassert>
#include <aws/core/net/SimpleUDP.h>
#include <aws/core/utils/logging/LogMacros.h>
namespace Aws
{
namespace Net
{
static const char ALLOC_TAG[] = "SimpleUDP";
static const char IPV4_LOOP_BACK_ADDRESS[] = "127.0.0.1";
static const char IPV6_LOOP_BACK_ADDRESS[] = "::1";
static inline bool IsValidIPAddress(const char* ip, int addressFamily/*AF_INET or AF_INET6*/)
{
char buffer[128];
return inet_pton(addressFamily, ip, (void*)buffer) == 1 ?true :false;
}
static bool GetASockAddrFromHostName(const char* hostName, void* sockAddrBuffer, size_t& addrLength, int& addressFamily)
{
struct addrinfo hints, *res;
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
if (getaddrinfo(hostName, nullptr, &hints, &res))
{
return false;
}
memcpy(sockAddrBuffer, res->ai_addr, res->ai_addrlen);
addrLength = res->ai_addrlen;
addressFamily = res->ai_family;
freeaddrinfo(res);
return true;
}
static sockaddr_in BuildAddrInfoIPV4(const char* hostIP, short port)
{
sockaddr_in addrinfo {};
addrinfo.sin_family = AF_INET;
addrinfo.sin_port = htons(port);
inet_pton(AF_INET, hostIP, &addrinfo.sin_addr);
return addrinfo;
}
static sockaddr_in6 BuildAddrInfoIPV6(const char* hostIP, short port)
{
sockaddr_in6 addrinfo {};
addrinfo.sin6_family = AF_INET6;
addrinfo.sin6_port = htons(port);
inet_pton(AF_INET6, hostIP, &addrinfo.sin6_addr);
return addrinfo;
}
SimpleUDP::SimpleUDP(int addressFamily, size_t sendBufSize, size_t receiveBufSize, bool nonBlocking):
m_addressFamily(addressFamily), m_connected(false), m_socket(-1), m_port(0)
{
CreateSocket(addressFamily, sendBufSize, receiveBufSize, nonBlocking);
}
SimpleUDP::SimpleUDP(bool IPV4, size_t sendBufSize, size_t receiveBufSize, bool nonBlocking) :
m_addressFamily(IPV4 ? AF_INET : AF_INET6), m_connected(false), m_socket(-1), m_port(0)
{
CreateSocket(m_addressFamily, sendBufSize, receiveBufSize, nonBlocking);
}
SimpleUDP::SimpleUDP(const char* host, unsigned short port, size_t sendBufSize, size_t receiveBufSize, bool nonBlocking) :
m_addressFamily(AF_INET), m_connected(false), m_socket(-1), m_port(port)
{
if (IsValidIPAddress(host, AF_INET))
{
m_addressFamily = AF_INET;
m_hostIP = Aws::String(host);
}
else if (IsValidIPAddress(host, AF_INET6))
{
m_addressFamily = AF_INET6;
m_hostIP = Aws::String(host);
}
else
{
char sockAddrBuffer[100];
char hostBuffer[100];
size_t addrLength = 0;
if (GetASockAddrFromHostName(host, (void*)sockAddrBuffer, addrLength, m_addressFamily))
{
if (m_addressFamily == AF_INET)
{
struct sockaddr_in* sockaddr = reinterpret_cast<struct sockaddr_in*>(sockAddrBuffer);
inet_ntop(m_addressFamily, &(sockaddr->sin_addr), hostBuffer, sizeof(hostBuffer));
}
else
{
struct sockaddr_in6* sockaddr = reinterpret_cast<struct sockaddr_in6*>(sockAddrBuffer);
inet_ntop(m_addressFamily, &(sockaddr->sin6_addr), hostBuffer, sizeof(hostBuffer));
}
m_hostIP = Aws::String(hostBuffer);
}
else
{
AWS_LOGSTREAM_ERROR(ALLOC_TAG, "Can't retrieve a valid ip address based on provided host: " << host);
}
}
CreateSocket(m_addressFamily, sendBufSize, receiveBufSize, nonBlocking);
}
SimpleUDP::~SimpleUDP()
{
closesocket(GetUnderlyingSocket());
}
void SimpleUDP::CreateSocket(int addressFamily, size_t sendBufSize, size_t receiveBufSize, bool nonBlocking)
{
SOCKET sock = socket(addressFamily, SOCK_DGRAM, IPPROTO_UDP);
assert(sock != INVALID_SOCKET);
// Try to set sock to nonblocking mode.
if (nonBlocking)
{
u_long enable = 1;
ioctlsocket(sock, FIONBIO, &enable);
}
// if sendBufSize is not zero, try to set send buffer size
if (sendBufSize)
{
int ret = setsockopt(sock, SOL_SOCKET, SO_SNDBUF, reinterpret_cast<const char*>(&sendBufSize), sizeof(sendBufSize));
if (ret)
{
AWS_LOGSTREAM_WARN(ALLOC_TAG, "Failed to set UDP send buffer size to " << sendBufSize << " for socket " << sock << " error code: " << WSAGetLastError());
}
assert(ret == 0);
}
// if receiveBufSize is not zero, try to set receive buffer size
if (receiveBufSize)
{
int ret = setsockopt(sock, SOL_SOCKET, SO_RCVBUF, reinterpret_cast<const char*>(&receiveBufSize), sizeof(receiveBufSize));
if (ret)
{
AWS_LOGSTREAM_WARN(ALLOC_TAG, "Failed to set UDP receive buffer size to " << receiveBufSize << " for socket " << sock << " error code: " << WSAGetLastError());
}
assert(ret == 0);
}
SetUnderlyingSocket(static_cast<int>(sock));
}
int SimpleUDP::Connect(const sockaddr* address, size_t addressLength)
{
int ret = connect(GetUnderlyingSocket(), address, static_cast<socklen_t>(addressLength));
m_connected = ret ? false : true;
return ret;
}
int SimpleUDP::ConnectToHost(const char* hostIP, unsigned short port) const
{
int ret;
if (m_addressFamily == AF_INET6)
{
sockaddr_in6 addrinfo = BuildAddrInfoIPV6(hostIP, port);
ret = connect(GetUnderlyingSocket(), reinterpret_cast<sockaddr*>(&addrinfo), sizeof(sockaddr_in6));
}
else
{
sockaddr_in addrinfo = BuildAddrInfoIPV4(hostIP, port);
ret = connect(GetUnderlyingSocket(), reinterpret_cast<sockaddr*>(&addrinfo), sizeof(sockaddr_in));
}
m_connected = ret ? false : true;
return ret;
}
int SimpleUDP::ConnectToLocalHost(unsigned short port) const
{
if (m_addressFamily == AF_INET6)
{
return ConnectToHost(IPV6_LOOP_BACK_ADDRESS, port);
}
else
{
return ConnectToHost(IPV4_LOOP_BACK_ADDRESS, port);
}
}
int SimpleUDP::Bind(const sockaddr* address, size_t addressLength) const
{
return bind(GetUnderlyingSocket(), address, static_cast<socklen_t>(addressLength));
}
int SimpleUDP::BindToLocalHost(unsigned short port) const
{
if (m_addressFamily == AF_INET6)
{
sockaddr_in6 addrinfo = BuildAddrInfoIPV6(IPV6_LOOP_BACK_ADDRESS, port);
return bind(GetUnderlyingSocket(), reinterpret_cast<sockaddr*>(&addrinfo), sizeof(sockaddr_in6));
}
else
{
sockaddr_in addrinfo = BuildAddrInfoIPV4(IPV4_LOOP_BACK_ADDRESS, port);
return bind(GetUnderlyingSocket(), reinterpret_cast<sockaddr*>(&addrinfo), sizeof(sockaddr_in));
}
}
int SimpleUDP::SendData(const uint8_t* data, size_t dataLen) const
{
if (!m_connected)
{
ConnectToHost(m_hostIP.c_str(), m_port);
}
return send(GetUnderlyingSocket(), reinterpret_cast<const char*>(data), static_cast<int>(dataLen), 0);
}
int SimpleUDP::SendDataTo(const sockaddr* address, size_t addressLength, const uint8_t* data, size_t dataLen) const
{
if (m_connected)
{
return send(GetUnderlyingSocket(), reinterpret_cast<const char*>(data), static_cast<int>(dataLen), 0);
}
else
{
return sendto(GetUnderlyingSocket(), reinterpret_cast<const char*>(data), static_cast<int>(dataLen), 0, address, static_cast<socklen_t>(addressLength));
}
}
int SimpleUDP::SendDataToLocalHost(const uint8_t* data, size_t dataLen, unsigned short port) const
{
if (m_connected)
{
return send(GetUnderlyingSocket(), reinterpret_cast<const char*>(data), static_cast<int>(dataLen), 0);
}
else if (m_addressFamily == AF_INET6)
{
sockaddr_in6 addrinfo = BuildAddrInfoIPV6(IPV6_LOOP_BACK_ADDRESS, port);
return sendto(GetUnderlyingSocket(), reinterpret_cast<const char*>(data), static_cast<int>(dataLen), 0, reinterpret_cast<sockaddr*>(&addrinfo), sizeof(sockaddr_in6));
}
else
{
sockaddr_in addrinfo = BuildAddrInfoIPV4(IPV4_LOOP_BACK_ADDRESS, port);
return sendto(GetUnderlyingSocket(), reinterpret_cast<const char*>(data), static_cast<int>(dataLen), 0, reinterpret_cast<sockaddr*>(&addrinfo), sizeof(sockaddr_in));
}
}
int SimpleUDP::ReceiveData(uint8_t* buffer, size_t bufferLen) const
{
return recv(GetUnderlyingSocket(), reinterpret_cast<char*>(buffer), static_cast<int>(bufferLen), 0);
}
int SimpleUDP::ReceiveDataFrom(sockaddr* address, size_t* addressLength, uint8_t* buffer, size_t bufferLen) const
{
return recvfrom(GetUnderlyingSocket(), reinterpret_cast<char*>(buffer), static_cast<int>(bufferLen), 0, address, reinterpret_cast<socklen_t*>(addressLength));
}
}
}
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