Linux and C[2]: What is the function of inet_aton or inet ntoa ?

John_NewBee

于 2017-02-25 22:41:26 发布

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本文链接：https://blog.youkuaiyun.com/weixin_37222141/article/details/57138605

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本文介绍了inet_aton函数的工作原理，该函数用于将IPv4地址从点分十进制字符串形式转换为网络字节序的32位整数。通过示例演示了如何使用此函数，并解释了从大端到小端格式的转换过程。

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What ever :inet_aton function translate ip address presentation such as “192.168.0.1” to numeric number in host.That is to say ,this function will transfer a string like ip address into a numeric ip address.

Test :

int main(){
int sockfd = socket(AF_INET,SOCK_RAW,0);
    struct sockaddr_in server_sock_in;
    bzero(&server_sock_in,sizeof(struct sockaddr_in));
    server_sock_in.sin_family=AF_INET;

    inet_aton("14.17.42.40",&(server_sock_in.sin_addr));
    printf("\nThe host 14.17.42.40 after aton function:\n%X\n",server_sock_in.sin_addr.s_addr);
    }

and the test result is like that:

The host 14.17.42.40 after aton function:
282A110E

According to the test above ,we can see how the function inet_aton works:
1. first , this function translate ‘14.17.42.40’ to big-endian like 0x0E 11 2A 28
2. then , this function will transfer big-endian to little endian if your system is little endian.0x 0E 11 2A 28–>0x 28 2A 11 0E