oem/ibm/libpldmresponder/utils.cpp

#include "utils.hpp"

#include <libpldm/base.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#include <unistd.h>

#include <phosphor-logging/lg2.hpp>

PHOSPHOR_LOG2_USING;

namespace pldm
{
namespace responder
{
namespace utils
{
int setupUnixSocket(const std::string& socketInterface)
{
    int sock;
    struct sockaddr_un addr;
    memset(&addr, 0, sizeof(addr));
    addr.sun_family = AF_UNIX;
    if (strnlen(socketInterface.c_str(), sizeof(addr.sun_path)) ==
        sizeof(addr.sun_path))
    {
        error("setupUnixSocket: UNIX socket path too long");
        return -1;
    }

    strncpy(addr.sun_path, socketInterface.c_str(), sizeof(addr.sun_path) - 1);

    if ((sock = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK, 0)) == -1)
    {
        error("setupUnixSocket: socket() call failed");
        return -1;
    }

    if (bind(sock, (struct sockaddr*)&addr, sizeof(addr)) == -1)
    {
        error("setupUnixSocket: bind() call failed  with errno {ERR}", "ERR",
              errno);
        close(sock);
        return -1;
    }

    if (listen(sock, 1) == -1)
    {
        error("setupUnixSocket: listen() call failed");
        close(sock);
        return -1;
    }

    fd_set rfd;
    struct timeval tv;
    tv.tv_sec = 1;
    tv.tv_usec = 0;

    FD_ZERO(&rfd);
    FD_SET(sock, &rfd);
    int nfd = sock + 1;
    int fd = -1;

    int retval = select(nfd, &rfd, NULL, NULL, &tv);
    if (retval < 0)
    {
        error("setupUnixSocket: select call failed {ERR}", "ERR", errno);
        close(sock);
        return -1;
    }

    if ((retval > 0) && (FD_ISSET(sock, &rfd)))
    {
        fd = accept(sock, NULL, NULL);
        if (fd < 0)
        {
            error("setupUnixSocket: accept() call failed {ERR}", "ERR", errno);
            close(sock);
            return -1;
        }
        close(sock);
    }
    return fd;
}

int writeToUnixSocket(const int sock, const char* buf, const uint64_t blockSize)
{
    uint64_t i;
    int nwrite = 0;

    for (i = 0; i < blockSize; i = i + nwrite)
    {
        fd_set wfd;
        struct timeval tv;
        tv.tv_sec = 1;
        tv.tv_usec = 0;

        FD_ZERO(&wfd);
        FD_SET(sock, &wfd);
        int nfd = sock + 1;

        int retval = select(nfd, NULL, &wfd, NULL, &tv);
        if (retval < 0)
        {
            error("writeToUnixSocket: select call failed {ERR}", "ERR", errno);
            close(sock);
            return -1;
        }
        if (retval == 0)
        {
            nwrite = 0;
            continue;
        }
        if ((retval > 0) && (FD_ISSET(sock, &wfd)))
        {
            nwrite = write(sock, buf + i, blockSize - i);
            if (nwrite < 0)
            {
                if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR)
                {
                    error(
                        "writeToUnixSocket: Write call failed with EAGAIN or EWOULDBLOCK or EINTR");
                    nwrite = 0;
                    continue;
                }
                error("writeToUnixSocket: Failed to write {ERR}", "ERR", errno);
                close(sock);
                return -1;
            }
        }
        else
        {
            nwrite = 0;
        }
    }
    return 0;
}

} // namespace utils
} // namespace responder
} // namespace pldm