83 lines
3.0 KiB
Go
83 lines
3.0 KiB
Go
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// BSD 3-Clause License
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//
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// Copyright (c) 2019, Guillaume Ballet
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice, this
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// list of conditions and the following disclaimer.
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//
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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//
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// * Neither the name of the copyright holder nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package pcsc
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import (
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"encoding/binary"
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"net"
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)
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/**
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* @brief Wrapper for the MessageSend() function.
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*
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* Called by clients to send messages to the server.
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* The parameters \p command and \p data are set in the \c sharedSegmentMsg
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* struct in order to be sent.
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*
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* @param[in] command Command to be sent.
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* @param[in] dwClientID Client socket handle.
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* @param[in] size Size of the message (\p data).
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* @param[in] data_void Data to be sent.
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*
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* @return Same error codes as MessageSend().
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*/
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func messageSendWithHeader(command uint32, conn net.Conn, data []byte) error {
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/* Translate header into bytes */
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msgData := make([]byte, 8+len(data))
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binary.LittleEndian.PutUint32(msgData[4:], command)
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binary.LittleEndian.PutUint32(msgData, uint32(len(data)))
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/* Copy payload */
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copy(msgData[8:], data)
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_, err := conn.Write(msgData)
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return err
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}
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// clientSetupSession prepares a communication channel for the client to talk to the server.
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// This is called by the application to create a socket for local IPC with the
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// server. The socket is associated to the file \c PCSCLITE_CSOCK_NAME.
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/*
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* @param[out] pdwClientID Client Connection ID.
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*
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* @retval 0 Success.
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* @retval -1 Can not create the socket.
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* @retval -1 The socket can not open a connection.
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* @retval -1 Can not set the socket to non-blocking.
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*/
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func clientSetupSession(daemonPath string) (net.Conn, error) {
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path := PCSCDSockName
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if len(daemonPath) > 0 {
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path = daemonPath
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}
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return net.Dial("unix", path)
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}
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