C/C++ 获得公网ip地址和内网ip

来源：互联网发布：mallat小波分解算法编辑：程序博客网时间：2024/04/30 03:11
获得公网ip：
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：
int getlocalip(char* outip){#ifndef WIN32int i=0;int sockfd;struct ifconf ifconf;char buf[512];struct ifreq *ifreq;char* ip;//初始化ifconfifconf.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;#elsereturn 0;#endif}
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