/*
　　Author　　:decwang@2014.09.01
　　Mail　　  :deworks@sina.com
*/
#define PRINTLOG printf
//返回0表示成功,其他为失败.

int getIpAddressByGetAddrInfo(const char* address,char* realIP,int maxLen)

{

    if (NULL == address || NULL == realIP)

    {

        PRINTLOG("param address wrong\n");

        return -;

    }

    struct addrinfo *answer = NULL, hint, *curr = NULL;

    bzero(&hint, sizeof(hint));

    hint.ai_family = AF_INET;

    hint.ai_socktype = SOCK_STREAM;

    int ret = getaddrinfo(address, NULL, &hint, &answer);

    if (ret != )

    {

        PRINTLOG("error on getaddrinfo: ret: %s\n",gai_strerror(ret));

        return -;

    }

    for (curr = answer; curr != NULL; curr = curr->ai_next)

    {

        inet_ntop(AF_INET,&(((struct sockaddr_in *)(curr->ai_addr))->sin_addr),realIP, maxLen);

        PRINTLOG("realIP is %s\n", realIP);

        break;

    }

    freeaddrinfo(answer);

    return ;

}
//返回1表示网络可达,返回其他为失败

int isReachable(const char* address,int port,int timeout)

{

    if (NULL == address)

    {

        PRINTLOG("param address wrong\n");

        return -;

    }

    if (timeout <= )

    {

        PRINTLOG("param timeout wrong\n");

        return -;

    }

    struct sockaddr_in    server_addr;

    char realIP[];

    memset(realIP,,sizeof(realIP));

    int nRet = getIpAddressByGetAddrInfo(address, realIP, -);

    if (nRet != )

    {

        PRINTLOG("get real ip address failed\n");

        return -;

    }

    if (port >=  || port <= )

    {

        PRINTLOG("port invalid\n");

        return -;

    }

    int sockfd = socket(AF_INET, SOCK_STREAM, );

    if(sockfd < )

    {

        PRINTLOG("create socket failed\n");

        return -;

    }

    memset(&server_addr, , sizeof(server_addr));

    server_addr.sin_family = AF_INET;

    server_addr.sin_port = htons(port);

    server_addr.sin_addr.s_addr = inet_addr(realIP);

    int error=-, len;

    len = sizeof(int);

    struct timeval tm;

    fd_set set;

    fcntl(sockfd, F_SETFL, O_NONBLOCK);

if( connect(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr)) ==-)

    {

        tm.tv_sec = timeout;

        tm.tv_usec = ;

        FD_ZERO(&set);

        FD_SET(sockfd, &set);

        if( select(sockfd+, NULL, &set, NULL, &tm) > )

        {

            getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &error, (socklen_t *)&len);

            if(error == )

                nRet = ;

            else

                nRet = ;

        }

        else

            nRet = ;

    }

    else

        nRet = ;

    close( sockfd );

    return nRet;

}