美文网首页
解析域名-笔记

解析域名-笔记

作者: I_YoYo | 来源:发表于2018-03-16 11:06 被阅读6次

    根据域名解析对应IP

    #include <stdio.h>
    #include <string.h>
    #include <stdlib.h>
    #include <netdb.h>
    #include <sys/types.h>
    #include <sys/socket.h>
    #include <arpa/inet.h>
    
    int lookup_host (const char *host)
    {
        struct addrinfo hints, *res;
        int errcode;
        char addrstr[100];
        void *ptr;
        
        memset (&hints, 0, sizeof (hints));
        hints.ai_family = PF_UNSPEC;
        hints.ai_socktype = SOCK_STREAM;
        hints.ai_flags |= AI_CANONNAME;
        
        errcode = getaddrinfo (host, NULL, &hints, &res);
        if (errcode != 0)
        {
            perror ("getaddrinfo");
            return -1;
        }
        
        printf ("Host: %s\n", host);
        while (res)
        {
            inet_ntop (res->ai_family, res->ai_addr->sa_data, addrstr, 100);
            //先判断IPV4 再IPV6
            switch (res->ai_family)
            {
                case AF_INET:
                    ptr = &((struct sockaddr_in *) res->ai_addr)->sin_addr;
                    break;
                case AF_INET6:
                    ptr = &((struct sockaddr_in6 *) res->ai_addr)->sin6_addr;
                    break;
            }
            inet_ntop (res->ai_family, ptr, addrstr, 100);
            printf ("IPv%d address: %s (%s)\n", res->ai_family == PF_INET6 ? 6 : 4,
                    addrstr, res->ai_canonname);
            res = res->ai_next;
        }
        
        return 0;
    }
    
    
    NSDate *startDate =[NSDate date];
       int re= lookup_host("www.baidu.com");
    //查看下解析时间
        NSDate *endDate =[NSDate date];
        NSTimeInterval time = [endDate timeIntervalSinceDate:startDate];
        NSLog(@"-->%lf",time);
    
    测试结果.png

    相关文章

      网友评论

          本文标题:解析域名-笔记

          本文链接:https://www.haomeiwen.com/subject/epylqftx.html