本文介绍了扩大IPv6地址,所以我可以将其打印到标准输出的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我使用getifaddrs()和inet_ntop()来获取系统中的IP地址。当系统被设置到IPv6的地址返回在缩短的版本(使用::为零)。有没有什么办法,以该地址扩展为一个完整的吗?

这是code我使用的:

 结构ifaddrs * myaddrs,* IFA;
无效* in_addr等;
焦炭BUF [64];如果(getifaddrs(安培;!myaddrs)= 0)
{
    PERROR(getifaddrs);
    出口(1);
}对于(IFA = myaddrs;!IFA = NULL; IFA = IFA-GT&; ifa_next)
{
    如果(IFA-GT&; ifa_addr == NULL)
        继续;
    如果((IFA-GT&;!ifa_flags&安培; IFF_UP))
        继续;    开关(IFA-GT&;&ifa_addr- GT;上sa_family)
    {
        案例AF_INET:
        {
            结构SOCKADDR_IN * S4 =(结构SOCKADDR_IN *)IFA-GT&; ifa_addr;
            in_addr结构=安培; S4-> sin_addr;
            打破;
        }        案例AF_INET6:
        {
            结构* sockaddr_in6的S6 =(结构* sockaddr_in6的)IFA-GT&; ifa_addr;
            in_addr结构=安培; s6-> sin6_addr;
            打破;
        }        默认:
            继续;
    }    (!inet_ntop(IFA-GT&;&ifa_addr- GT;上sa_family,in_addr结构,BUF,sizeof的(BUF)))如果
    {
        的printf(%S:inet_ntop失败\\ n,IFA-GT&; ifa_name);
    }
    其他
    {
        的printf(IP地址:%S \\ n,BUF);
    }
}freeifaddrs(myaddrs);

code是大大AP preciated。

编辑:结果
由于这显然是很难COM prehend我会给你一个例子:

如果我得到ABCD:12:3我需要把它扩大到ABCD:0012:0000:0000:0000:0000:0000:0003结果
原因?因为它的需求的一部分。就这么简单。


解决方案

 无效ipv6_to_str_unexpanded(的char * str中,常量结构in6_addr *地址){
   sprintf的(STR,%02X%02X:%02X%02X:%02X%02X:%02X%02X:%02X%02X:%02X%02X:%02X%02X:%02X%02X
                 (INT)addr-> s6_addr [0],(int)的addr-> s6_addr [1],
                 (INT)addr-> s6_addr [2],(int)的addr-> s6_addr [3],
                 (INT)addr-> s6_addr [4],(int)的addr-> s6_addr [5],
                 (INT)addr-> s6_addr [6],(int)的addr-> s6_addr [7],
                 (INT)addr-> s6_addr [8],(int)的addr-> s6_addr [9],
                 (INT)addr-> s6_addr [10],(int)的addr-> s6_addr [11],
                 (INT)addr-> s6_addr [12],(int)的addr-> s6_addr [13],
                 (INT)addr-> s6_addr [14],(int)的addr-> s6_addr [15]);
}

I am using getifaddrs() and inet_ntop() to get the ip addresses on the system. When the system is set to IPv6 the address returned is in the shortened version (using :: for zeros). Is there any way to expand that address to a full one?

This is the code I am using:

struct ifaddrs *myaddrs, *ifa;
void *in_addr;
char buf[64];

if(getifaddrs(&myaddrs) != 0)
{
    perror("getifaddrs");
    exit(1);
}

for (ifa = myaddrs; ifa != NULL; ifa = ifa->ifa_next)
{
    if (ifa->ifa_addr == NULL)
        continue;
    if (!(ifa->ifa_flags & IFF_UP))
        continue;

    switch (ifa->ifa_addr->sa_family)
    {
        case AF_INET:
        {
            struct sockaddr_in *s4 = (struct sockaddr_in *)ifa->ifa_addr;
            in_addr = &s4->sin_addr;
            break;
        }

        case AF_INET6:
        {
            struct sockaddr_in6 *s6 = (struct sockaddr_in6 *)ifa->ifa_addr;
            in_addr = &s6->sin6_addr;
            break;
        }

        default:
            continue;
    }

    if (!inet_ntop(ifa->ifa_addr->sa_family, in_addr, buf, sizeof(buf)))
    {
        printf("%s: inet_ntop failed!\n", ifa->ifa_name);
    }
    else
    {
        printf("IP address: %s\n", buf);
    }
}

freeifaddrs(myaddrs);

Code is greatly appreciated.

EDIT:
Since this is apparently very hard to comprehend I will give you an example:

If I get abcd:12::3 I need to expand it to abcd:0012:0000:0000:0000:0000:0000:0003
The reason? because it's part of the requirements. Simple as that.

解决方案
void ipv6_to_str_unexpanded(char * str, const struct in6_addr * addr) {
   sprintf(str, "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x",
                 (int)addr->s6_addr[0], (int)addr->s6_addr[1],
                 (int)addr->s6_addr[2], (int)addr->s6_addr[3],
                 (int)addr->s6_addr[4], (int)addr->s6_addr[5],
                 (int)addr->s6_addr[6], (int)addr->s6_addr[7],
                 (int)addr->s6_addr[8], (int)addr->s6_addr[9],
                 (int)addr->s6_addr[10], (int)addr->s6_addr[11],
                 (int)addr->s6_addr[12], (int)addr->s6_addr[13],
                 (int)addr->s6_addr[14], (int)addr->s6_addr[15]);
}

这篇关于扩大IPv6地址,所以我可以将其打印到标准输出的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

10-30 05:22