socketft.cpp

// socketft.cpp - written and placed in the public domain by Wei Dai

#include "pch.h"
#include "socketft.h"

#ifdef SOCKETS_AVAILABLE

#include "wait.h"

#ifdef USE_BERKELEY_STYLE_SOCKETS
#include <errno.h>
#include <netdb.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/ioctl.h>
#endif

NAMESPACE_BEGIN(CryptoPP)

#ifdef USE_WINDOWS_STYLE_SOCKETS
const int SOCKET_EINVAL = WSAEINVAL;
const int SOCKET_EWOULDBLOCK = WSAEWOULDBLOCK;
typedef int socklen_t;
#else
const int SOCKET_EINVAL = EINVAL;
const int SOCKET_EWOULDBLOCK = EWOULDBLOCK;
#endif

Socket::Err::Err(socket_t s, const std::string& operation, int error)
        : OS_Error(IO_ERROR, "Socket: " + operation + " operation failed with error " + IntToString(error), operation, error)
        , m_s(s)
{
}

Socket::~Socket()
{
        if (m_own)
        {
                try
                {
                        CloseSocket();
                }
                catch (...)
                {
                }
        }
}

void Socket::AttachSocket(socket_t s, bool own)
{
        if (m_own)
                CloseSocket();

        m_s = s;
        m_own = own;
        SocketChanged();
}

socket_t Socket::DetachSocket()
{
        socket_t s = m_s;
        m_s = INVALID_SOCKET;
        SocketChanged();
        return s;
}

void Socket::Create(int nType)
{
        assert(m_s == INVALID_SOCKET);
        m_s = socket(AF_INET, nType, 0);
        CheckAndHandleError("socket", m_s);
        m_own = true;
        SocketChanged();
}

void Socket::CloseSocket()
{
        if (m_s != INVALID_SOCKET)
        {
#ifdef USE_WINDOWS_STYLE_SOCKETS
                CancelIo((HANDLE) m_s);
                CheckAndHandleError_int("closesocket", closesocket(m_s));
#else
                CheckAndHandleError_int("close", close(m_s));
#endif
                m_s = INVALID_SOCKET;
                SocketChanged();
        }
}

void Socket::Bind(unsigned int port, const char *addr)
{
        sockaddr_in sa;
        memset(&sa, 0, sizeof(sa));
        sa.sin_family = AF_INET;

        if (addr == NULL)
                sa.sin_addr.s_addr = htonl(INADDR_ANY);
        else
        {
                unsigned long result = inet_addr(addr);
                if (result == -1)       // Solaris doesn't have INADDR_NONE
                {
                        SetLastError(SOCKET_EINVAL);
                        CheckAndHandleError_int("inet_addr", SOCKET_ERROR);
                }
                sa.sin_addr.s_addr = result;
        }

        sa.sin_port = htons((u_short)port);

        Bind((sockaddr *)&sa, sizeof(sa));
}

void Socket::Bind(const sockaddr *psa, socklen_t saLen)
{
        assert(m_s != INVALID_SOCKET);
        // cygwin workaround: needs const_cast
        CheckAndHandleError_int("bind", bind(m_s, const_cast<sockaddr *>(psa), saLen));
}

void Socket::Listen(int backlog)
{
        assert(m_s != INVALID_SOCKET);
        CheckAndHandleError_int("listen", listen(m_s, backlog));
}

bool Socket::Connect(const char *addr, unsigned int port)
{
        assert(addr != NULL);

        sockaddr_in sa;
        memset(&sa, 0, sizeof(sa));
        sa.sin_family = AF_INET;
        sa.sin_addr.s_addr = inet_addr(addr);

        if (sa.sin_addr.s_addr == -1)   // Solaris doesn't have INADDR_NONE
        {
                hostent *lphost = gethostbyname(addr);
                if (lphost == NULL)
                {
                        SetLastError(SOCKET_EINVAL);
                        CheckAndHandleError_int("gethostbyname", SOCKET_ERROR);
                }

                sa.sin_addr.s_addr = ((in_addr *)lphost->h_addr)->s_addr;
        }

        sa.sin_port = htons((u_short)port);

        return Connect((const sockaddr *)&sa, sizeof(sa));
}

bool Socket::Connect(const sockaddr* psa, socklen_t saLen)
{
        assert(m_s != INVALID_SOCKET);
        int result = connect(m_s, const_cast<sockaddr*>(psa), saLen);
        if (result == SOCKET_ERROR && GetLastError() == SOCKET_EWOULDBLOCK)
                return false;
        CheckAndHandleError_int("connect", result);
        return true;
}

bool Socket::Accept(Socket& target, sockaddr *psa, socklen_t *psaLen)
{
        assert(m_s != INVALID_SOCKET);
        socket_t s = accept(m_s, psa, psaLen);
        if (s == INVALID_SOCKET && GetLastError() == SOCKET_EWOULDBLOCK)
                return false;
        CheckAndHandleError("accept", s);
        target.AttachSocket(s, true);
        return true;
}

void Socket::GetSockName(sockaddr *psa, socklen_t *psaLen)
{
        assert(m_s != INVALID_SOCKET);
        CheckAndHandleError_int("getsockname", getsockname(m_s, psa, psaLen));
}

void Socket::GetPeerName(sockaddr *psa, socklen_t *psaLen)
{
        assert(m_s != INVALID_SOCKET);
        CheckAndHandleError_int("getpeername", getpeername(m_s, psa, psaLen));
}

unsigned int Socket::Send(const byte* buf, size_t bufLen, int flags)
{
        assert(m_s != INVALID_SOCKET);
        int result = send(m_s, (const char *)buf, UnsignedMin(INT_MAX, bufLen), flags);
        CheckAndHandleError_int("send", result);
        return result;
}

unsigned int Socket::Receive(byte* buf, size_t bufLen, int flags)
{
        assert(m_s != INVALID_SOCKET);
        int result = recv(m_s, (char *)buf, UnsignedMin(INT_MAX, bufLen), flags);
        CheckAndHandleError_int("recv", result);
        return result;
}

void Socket::ShutDown(int how)
{
        assert(m_s != INVALID_SOCKET);
        int result = shutdown(m_s, how);
        CheckAndHandleError_int("shutdown", result);
}

void Socket::IOCtl(long cmd, unsigned long *argp)
{
        assert(m_s != INVALID_SOCKET);
#ifdef USE_WINDOWS_STYLE_SOCKETS
        CheckAndHandleError_int("ioctlsocket", ioctlsocket(m_s, cmd, argp));
#else
        CheckAndHandleError_int("ioctl", ioctl(m_s, cmd, argp));
#endif
}

bool Socket::SendReady(const timeval *timeout)
{
        fd_set fds;
        FD_ZERO(&fds);
        FD_SET(m_s, &fds);
        int ready;
        if (timeout == NULL)
                ready = select((int)m_s+1, NULL, &fds, NULL, NULL);
        else
        {
                timeval timeoutCopy = *timeout; // select() modified timeout on Linux
                ready = select((int)m_s+1, NULL, &fds, NULL, &timeoutCopy);
        }
        CheckAndHandleError_int("select", ready);
        return ready > 0;
}

bool Socket::ReceiveReady(const timeval *timeout)
{
        fd_set fds;
        FD_ZERO(&fds);
        FD_SET(m_s, &fds);
        int ready;
        if (timeout == NULL)
                ready = select((int)m_s+1, &fds, NULL, NULL, NULL);
        else
        {
                timeval timeoutCopy = *timeout; // select() modified timeout on Linux
                ready = select((int)m_s+1, &fds, NULL, NULL, &timeoutCopy);
        }
        CheckAndHandleError_int("select", ready);
        return ready > 0;
}

unsigned int Socket::PortNameToNumber(const char *name, const char *protocol)
{
        int port = atoi(name);
        if (IntToString(port) == name)
                return port;

        servent *se = getservbyname(name, protocol);
        if (!se)
                throw Err(INVALID_SOCKET, "getservbyname", SOCKET_EINVAL);
        return ntohs(se->s_port);
}

void Socket::StartSockets()
{
#ifdef USE_WINDOWS_STYLE_SOCKETS
        WSADATA wsd;
        int result = WSAStartup(0x0202, &wsd);
        if (result != 0)
                throw Err(INVALID_SOCKET, "WSAStartup", result);
#endif
}

void Socket::ShutdownSockets()
{
#ifdef USE_WINDOWS_STYLE_SOCKETS
        int result = WSACleanup();
        if (result != 0)
                throw Err(INVALID_SOCKET, "WSACleanup", result);
#endif
}

int Socket::GetLastError()
{
#ifdef USE_WINDOWS_STYLE_SOCKETS
        return WSAGetLastError();
#else
        return errno;
#endif
}

void Socket::SetLastError(int errorCode)
{
#ifdef USE_WINDOWS_STYLE_SOCKETS
        WSASetLastError(errorCode);
#else
        errno = errorCode;
#endif
}

void Socket::HandleError(const char *operation) const
{
        int err = GetLastError();
        throw Err(m_s, operation, err);
}

#ifdef USE_WINDOWS_STYLE_SOCKETS

SocketReceiver::SocketReceiver(Socket &s)
        : m_s(s), m_resultPending(false), m_eofReceived(false)
{
        m_event.AttachHandle(CreateEvent(NULL, true, false, NULL), true);
        m_s.CheckAndHandleError("CreateEvent", m_event.HandleValid());
        memset(&m_overlapped, 0, sizeof(m_overlapped));
        m_overlapped.hEvent = m_event;
}

SocketReceiver::~SocketReceiver()
{
#ifdef USE_WINDOWS_STYLE_SOCKETS
        CancelIo((HANDLE) m_s.GetSocket());
#endif
}

bool SocketReceiver::Receive(byte* buf, size_t bufLen)
{
        assert(!m_resultPending && !m_eofReceived);

        DWORD flags = 0;
        // don't queue too much at once, or we might use up non-paged memory
        WSABUF wsabuf = {UnsignedMin((u_long)128*1024, bufLen), (char *)buf};
        if (WSARecv(m_s, &wsabuf, 1, &m_lastResult, &flags, &m_overlapped, NULL) == 0)
        {
                if (m_lastResult == 0)
                        m_eofReceived = true;
        }
        else
        {
                switch (WSAGetLastError())
                {
                default:
                        m_s.CheckAndHandleError_int("WSARecv", SOCKET_ERROR);
                case WSAEDISCON:
                        m_lastResult = 0;
                        m_eofReceived = true;
                        break;
                case WSA_IO_PENDING:
                        m_resultPending = true;
                }
        }
        return !m_resultPending;
}

void SocketReceiver::GetWaitObjects(WaitObjectContainer &container, CallStack const& callStack)
{
        if (m_resultPending)
                container.AddHandle(m_event, CallStack("SocketReceiver::GetWaitObjects() - result pending", &callStack));
        else if (!m_eofReceived)
                container.SetNoWait(CallStack("SocketReceiver::GetWaitObjects() - result ready", &callStack));
}

unsigned int SocketReceiver::GetReceiveResult()
{
        if (m_resultPending)
        {
                DWORD flags = 0;
                if (WSAGetOverlappedResult(m_s, &m_overlapped, &m_lastResult, false, &flags))
                {
                        if (m_lastResult == 0)
                                m_eofReceived = true;
                }
                else
                {
                        switch (WSAGetLastError())
                        {
                        default:
                                m_s.CheckAndHandleError("WSAGetOverlappedResult", FALSE);
                        case WSAEDISCON:
                                m_lastResult = 0;
                                m_eofReceived = true;
                        }
                }
                m_resultPending = false;
        }
        return m_lastResult;
}

// *************************************************************

SocketSender::SocketSender(Socket &s)
        : m_s(s), m_resultPending(false), m_lastResult(0)
{
        m_event.AttachHandle(CreateEvent(NULL, true, false, NULL), true);
        m_s.CheckAndHandleError("CreateEvent", m_event.HandleValid());
        memset(&m_overlapped, 0, sizeof(m_overlapped));
        m_overlapped.hEvent = m_event;
}


SocketSender::~SocketSender()
{
#ifdef USE_WINDOWS_STYLE_SOCKETS
        CancelIo((HANDLE) m_s.GetSocket());
#endif
}

void SocketSender::Send(const byte* buf, size_t bufLen)
{
        assert(!m_resultPending);
        DWORD written = 0;
        // don't queue too much at once, or we might use up non-paged memory
        WSABUF wsabuf = {UnsignedMin((u_long)128*1024, bufLen), (char *)buf};
        if (WSASend(m_s, &wsabuf, 1, &written, 0, &m_overlapped, NULL) == 0)
        {
                m_resultPending = false;
                m_lastResult = written;
        }
        else
        {
                if (WSAGetLastError() != WSA_IO_PENDING)
                        m_s.CheckAndHandleError_int("WSASend", SOCKET_ERROR);

                m_resultPending = true;
        }
}

void SocketSender::SendEof()
{
        assert(!m_resultPending);
        m_s.ShutDown(SD_SEND);
        m_s.CheckAndHandleError("ResetEvent", ResetEvent(m_event));
        m_s.CheckAndHandleError_int("WSAEventSelect", WSAEventSelect(m_s, m_event, FD_CLOSE));
        m_resultPending = true;
}

bool SocketSender::EofSent()
{
        if (m_resultPending)
        {
                WSANETWORKEVENTS events;
                m_s.CheckAndHandleError_int("WSAEnumNetworkEvents", WSAEnumNetworkEvents(m_s, m_event, &events));
                if ((events.lNetworkEvents & FD_CLOSE) != FD_CLOSE)
                        throw Socket::Err(m_s, "WSAEnumNetworkEvents (FD_CLOSE not present)", E_FAIL);
                if (events.iErrorCode[FD_CLOSE_BIT] != 0)
                        throw Socket::Err(m_s, "FD_CLOSE (via WSAEnumNetworkEvents)", events.iErrorCode[FD_CLOSE_BIT]);
                m_resultPending = false;
        }
        return m_lastResult != 0;
}

void SocketSender::GetWaitObjects(WaitObjectContainer &container, CallStack const& callStack)
{
        if (m_resultPending)
                container.AddHandle(m_event, CallStack("SocketSender::GetWaitObjects() - result pending", &callStack));
        else
                container.SetNoWait(CallStack("SocketSender::GetWaitObjects() - result ready", &callStack));
}

unsigned int SocketSender::GetSendResult()
{
        if (m_resultPending)
        {
                DWORD flags = 0;
                BOOL result = WSAGetOverlappedResult(m_s, &m_overlapped, &m_lastResult, false, &flags);
                m_s.CheckAndHandleError("WSAGetOverlappedResult", result);
                m_resultPending = false;
        }
        return m_lastResult;
}

#endif

#ifdef USE_BERKELEY_STYLE_SOCKETS

SocketReceiver::SocketReceiver(Socket &s)
        : m_s(s), m_lastResult(0), m_eofReceived(false)
{
}

void SocketReceiver::GetWaitObjects(WaitObjectContainer &container, CallStack const& callStack)
{
        if (!m_eofReceived)
                container.AddReadFd(m_s, CallStack("SocketReceiver::GetWaitObjects()", &callStack));
}

bool SocketReceiver::Receive(byte* buf, size_t bufLen)
{
        m_lastResult = m_s.Receive(buf, bufLen);
        if (bufLen > 0 && m_lastResult == 0)
                m_eofReceived = true;
        return true;
}

unsigned int SocketReceiver::GetReceiveResult()
{
        return m_lastResult;
}

SocketSender::SocketSender(Socket &s)
        : m_s(s), m_lastResult(0)
{
}

void SocketSender::Send(const byte* buf, size_t bufLen)
{
        m_lastResult = m_s.Send(buf, bufLen);
}

void SocketSender::SendEof()
{
        m_s.ShutDown(SD_SEND);
}

unsigned int SocketSender::GetSendResult()
{
        return m_lastResult;
}

void SocketSender::GetWaitObjects(WaitObjectContainer &container, CallStack const& callStack)
{
        container.AddWriteFd(m_s, CallStack("SocketSender::GetWaitObjects()", &callStack));
}

#endif

NAMESPACE_END

#endif  // #ifdef SOCKETS_AVAILABLE

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