C/C++ 获得公网ip地址和内网ip

2015-4-23 13:25 3436 0

摘要: 获得公网ip： view plaincopy在CODE上查看代码片派生到我的代码片bool getPublicIp(string ip) { int sock; char **pptr = NULL; struct sockaddr_in destAddr; struct hostent *ptr = NULL; char destIP; so ...

关键词： nbsp struct ifconf return ifreq destAddr destIP 代码 sockfd pptr

获得公网ip：
[cpp] view plaincopy在CODE上查看代码片派生到我的代码片
bool getPublicIp(string& ip)
{
    int    sock;
    char **pptr = NULL;
    struct sockaddr_in    destAddr;
    struct hostent    *ptr = NULL;
    char destIP[128];

    sock = socket(AF_INET,SOCK_STREAM,0);
    if( -1 == sock ){
        perror("creat socket failed");
        return false;
    }
    bzero((void *)&destAddr,sizeof(destAddr));
    destAddr.sin_family = AF_INET;
    destAddr.sin_port = htons(80);
    ptr = gethostbyname("www.ip138.com");
    if(NULL == ptr){
        perror("gethostbyname error");
        return false;
    }
    for(pptr=ptr->h_addr_list ; NULL != *pptr ; ++pptr){
        inet_ntop(ptr->h_addrtype,*pptr,destIP,sizeof(destIP));
        printf("addr:%s\n",destIP);
        ip = destIP;
        return true;
    }
    return true;
}
获得内网ip：
[cpp] view plaincopy在CODE上查看代码片派生到我的代码片
int getlocalip(char* outip)
{
#ifndef WIN32
    int i=0;
    int sockfd;
    struct ifconf ifconf;
    char buf[512];
    struct ifreq *ifreq;
    char* ip;
    //初始化ifconf
    ifconf.ifc_len = 512;
    ifconf.ifc_buf = buf;
    strcpy(outip,"127.0.0.1");
    if((sockfd = socket(AF_INET, SOCK_DGRAM, 0))<0)
    {
        return -1;
    }
    ioctl(sockfd, SIOCGIFCONF, &ifconf);    //获取所有接口信息
    close(sockfd);
    //接下来一个一个的获取IP地址
    ifreq = (struct ifreq*)buf;
    for(i=(ifconf.ifc_len/sizeof(struct ifreq)); i>0; i--)
    {
        ip = inet_ntoa(((struct sockaddr_in*)&(ifreq->ifr_addr))->sin_addr);

        if(strcmp(ip,"127.0.0.1")==0) //排除127.0.0.1，继续下一个
        {
            ifreq++;
            continue;
        }
    }
    strcpy(outip,ip);
    return 0;
#else
    return 0;
#endif

}

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