SocketHelper.cpp

Go to the documentation of this file.

/*
 * SocketHelper.cpp
 *
 *  Created on: May 28, 2020
 *      Author: tcanham
 */
 
#include <Fw/Types/BasicTypes.hpp>
#include <Fw/Types/Assert.hpp>
#include <Drv/SocketIpDriver/SocketHelper.hpp>
#include <Fw/Logger/Logger.hpp>
 
// This implementation has primarily implemented to isolate
// the socket interface from the F' Fw::Buffer class.
// There is a macro in VxWorks (m_data) that collides with
// the m_data member in Fw::Buffer.
 
 
#ifdef TGT_OS_TYPE_VXWORKS
    #include <socket.h>
    #include <inetLib.h>
    #include <fioLib.h>
    #include <hostLib.h>
    #include <ioLib.h>
    #include <vxWorks.h>
    #include <sockLib.h>
    #include <fioLib.h>
    #include <taskLib.h>
    #include <sysLib.h>
    #include <errnoLib.h>
    #include <string.h>
#elif defined TGT_OS_TYPE_LINUX || TGT_OS_TYPE_DARWIN
    #include <sys/socket.h>
    #include <netdb.h>
    #include <unistd.h>
    #include <errno.h>
    #include <arpa/inet.h>
#else
    #error OS not supported for IP Socket Communications
#endif
 
#include <stdio.h>
#include <string.h>
 
 
namespace Drv {
 
    // put network specific state we need to isolate here
 
    struct SocketState {
        struct sockaddr_in m_udpAddr;  
    };
 
    SocketHelper::SocketHelper() : m_state(new SocketState)
        ,m_socketInFd(-1)
        ,m_socketOutFd(-1)
        ,m_sendUdp(false)
        ,m_timeoutSeconds(0)
        ,m_timeoutMicroseconds(0)
        ,m_port(0)
    {
    }
 
    SocketHelper::~SocketHelper() {
        delete this->m_state;
    }
 
    SocketIpStatus SocketHelper::configure(
            const char* hostname,
            const U16 port,
            const bool send_udp,
            const U32 timeout_seconds,
            const U32 timeout_microseconds
            ) {
        this->m_sendUdp = send_udp;
        this->m_timeoutSeconds = timeout_seconds;
        this->m_timeoutSeconds = timeout_seconds;
        this->m_port = port;
        // copy hostname to local copy
        (void)strncpy(this->m_hostname,hostname,MAX_HOSTNAME_SIZE);
        // null terminate
        this->m_hostname[MAX_HOSTNAME_SIZE-1] = 0;
        return SOCK_SUCCESS;
    }
 
    bool SocketHelper::isOpened(void) {
        return (-1 != this->m_socketInFd);
    }
 
    void SocketHelper::close(void) {
        if (this->m_socketInFd != -1) {
            (void) ::close(this->m_socketInFd);
        }
        this->m_socketInFd = -1;
        this->m_socketOutFd = -1;
    }
 
    SocketIpStatus SocketHelper::open(void) {
 
        SocketIpStatus status = SOCK_SUCCESS;
        // Only the input (TCP) socket needs closing
        if (this->m_socketInFd != -1) {
            (void) ::close(this->m_socketInFd); // Close open sockets, to force a re-open
        }
        this->m_socketInFd = -1;
        // Open a TCP socket for incoming commands, and outgoing data if not using UDP
        status = this->openProtocol(SOCK_STREAM);
        if (status != SOCK_SUCCESS) {
            return status;
        }
        // If we need UDP sending, attempt to open UDP
        if (this->m_sendUdp && this->m_socketOutFd == -1 && (status = this->openProtocol(SOCK_DGRAM, false)) != SOCK_SUCCESS) {
            (void) ::close(this->m_socketInFd);
            return status;
        }
        // Not sending UDP, reuse our input TCP socket
        else if (!this->m_sendUdp) {
            this->m_socketOutFd = this->m_socketInFd;
        }
        // Coding error, if not successful here
        FW_ASSERT(status == SOCK_SUCCESS);
 
        return status;
 
    }
 
    SocketIpStatus SocketHelper::openProtocol(NATIVE_INT_TYPE protocol, bool isInput) {
 
        NATIVE_INT_TYPE socketFd = -1;
        struct sockaddr_in address;
 
        // Clear existing file descriptors
        if (isInput and this->m_socketInFd != -1) {
            (void) ::close(this->m_socketInFd);
            this->m_socketInFd = -1;
        } else if (not isInput and this->m_socketOutFd != -1) {
            (void) ::close(this->m_socketOutFd);
            this->m_socketOutFd = -1;
        }
        // Acquire a socket, or return error
        if ((socketFd = ::socket(AF_INET, protocol, 0)) == -1) {
            return SOCK_FAILED_TO_GET_SOCKET;
        }
        // Set up the address port and name
        address.sin_family = AF_INET;
        address.sin_port = htons(this->m_port);
  #if defined TGT_OS_TYPE_VXWORKS || TGT_OS_TYPE_DARWIN
        address.sin_len = static_cast<U8>(sizeof(struct sockaddr_in));
  #endif
  // Get the IP address from host
  #ifdef TGT_OS_TYPE_VXWORKS
        address.sin_addr.s_addr = inet_addr(this->m_hostname);
  #else
        // Set timeout socket option
        struct timeval timeout;
        timeout.tv_sec = this->m_timeoutSeconds;
        timeout.tv_usec = this->m_timeoutMicroseconds;
        // set socket write to timeout after 1 sec
        if (setsockopt(socketFd, SOL_SOCKET, SO_SNDTIMEO, (char *)&timeout, sizeof(timeout)) < 0) {
            (void) ::close(socketFd);
            return SOCK_FAILED_TO_SET_SOCKET_OPTIONS;
        }
        // Get possible IP addresses
        struct hostent *host_entry;
        if ((host_entry = gethostbyname(this->m_hostname)) == NULL || host_entry->h_addr_list[0] == NULL) {
            ::close(socketFd);
            return SOCK_FAILED_TO_GET_HOST_IP;
        }
        // First IP address to socket sin_addr
        if (inet_pton(address.sin_family, m_hostname, &(address.sin_addr)) < 0) {
            ::close(socketFd);
            return SOCK_INVALID_IP_ADDRESS;
        };
  #endif
        // If TCP, connect to the socket to allow for communication
        if (protocol != SOCK_DGRAM && connect(socketFd, reinterpret_cast<struct sockaddr *>(&address),
                sizeof(address)) < 0) {
            ::close(socketFd);
            return SOCK_FAILED_TO_CONNECT;
        }
        // Store the UDP address for later
        else if (protocol == SOCK_DGRAM) {
            FW_ASSERT(sizeof(this->m_state->m_udpAddr) == sizeof(address), sizeof(this->m_state->m_udpAddr), sizeof(address));
            memcpy(&this->m_state->m_udpAddr, &address, sizeof(this->m_state->m_udpAddr));
        }
 
        // Set the member socket variable
        if (isInput) {
            this->m_socketInFd = socketFd;
        } else {
            this->m_socketOutFd = socketFd;
        }
        Fw::Logger::logMsg("Connected to %s:%hu for %s using %s\n", reinterpret_cast<POINTER_CAST>(m_hostname), m_port,
                           reinterpret_cast<POINTER_CAST>(isInput ? "uplink" : "downlink"),
                           reinterpret_cast<POINTER_CAST>((protocol == SOCK_DGRAM) ? "udp" : "tcp"));
        return SOCK_SUCCESS;
 
    }
 
    void SocketHelper::send(U8* data, const U32 size) {
 
        U32 total = 0;
        // Prevent transmission before connection, or after a disconnect
        if (this->m_socketOutFd == -1) {
            return;
        }
        // Attempt to send out data
        for (U32 i = 0; i < MAX_SEND_ITERATIONS && total < size; i++) {
            I32 sent = 0;
            // Output to send UDP
            if (this->m_sendUdp) {
                sent = ::sendto(this->m_socketOutFd, data + total, size - total, SOCKET_SEND_FLAGS,
                              reinterpret_cast<struct sockaddr *>(&this->m_state->m_udpAddr), sizeof(this->m_state->m_udpAddr));
            }
            // Output to send TCP
            else {
                sent = ::send(this->m_socketOutFd, data + total, size - total, SOCKET_SEND_FLAGS);
            }
            // Error is EINTR, just try again
            if (sent == -1 && errno == EINTR) {
                continue;
            }
            // Error bad file descriptor is a close
            else if (sent == -1 && errno == EBADF) {
                Fw::Logger::logMsg("[ERROR] Server disconnected\n");
                this->close();
                this->m_socketOutFd = -1;
                break;
            }
            // Error returned, and it wasn't an interrupt
            else if (sent == -1 && errno != EINTR) {
                Fw::Logger::logMsg("[ERROR] IP send failed ERRNO: %d UDP: %d\n", errno, m_sendUdp);
                break;
            }
            // Successful write
            else {
                total += sent;
            }
        }
 
    }
 
    SocketIpStatus SocketHelper::recv(U8* data, I32 &size) {
 
        SocketIpStatus status = SOCK_SUCCESS;
        // Attempt to recv out data
        size = ::recv(m_socketInFd, data, MAX_RECV_BUFFER_SIZE, SOCKET_RECV_FLAGS);
        // Error returned, and it wasn't an interrupt, nor a reset
        if (size == -1 && errno != EINTR && errno != ECONNRESET) {
            Fw::Logger::logMsg("[ERROR] IP recv failed ERRNO: %d\n", errno);
            status = SOCK_READ_ERROR; // Stop recv task on error
        }
        // Error is EINTR, just try again
        else if (size == -1 && errno == EINTR) {
            status = SOCK_INTERRUPTED_TRY_AGAIN;
        }
        // Zero bytes read means a closed socket
        else if (size == 0 || errno == ECONNRESET) {
            status = SOCK_READ_DISCONNECTED;
        }
 
        return status;
 
    }
 
}