将c6:8b:35:39:cb:ab转换为ipv6 link-local-address C语言实现

IPv6 link-local address由fe80开头，后跟EUI-64格式的MAC地址的后64位，其中MAC地址中间的冒号需要去掉，同时在中间插入fffe来构造64位的地址。因此，将c6:8b:35:39:cb:ab转换为IPv6 link-local address的C语言实现如下：

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <netinet/in.h>

int main(int argc, char *argv[]) {
    if (argc != 2) {
        printf("Usage: %s <MAC address in format c6:8b:35:39:cb:ab>\n", argv[0]);
        return 1;
    }
    char mac_address[18];
    strcpy(mac_address, argv[1]);
    char *token;
    char *rest = mac_address;
    char mac_bytes[6];
    int i = 0;
    while ((token = strtok_r(rest, ":", &rest))) {
        mac_bytes[i] = (unsigned char) strtol(token, NULL, 16);
        i++;
    }
    uint8_t eui64[8];
    eui64[0] = 0xfe;
    eui64[1] = 0x80;
    eui64[2] = mac_bytes[0] ^ 0x02;
    eui64[3] = mac_bytes[1];
    eui64[4] = mac_bytes[2];
    eui64[5] = 0xff;
    eui64[6] = 0xfe;
    eui64[7] = mac_bytes[3];
    printf("IPv6 link-local address: fe80::%02x%02x:%02xff:fe%02x:%02x%02x\n",
           eui64[2], eui64[3], eui64[4], eui64[5], eui64[6], eui64[7]);
    return 0;
}

该程序接受一个MAC地址作为参数，并将其转换为IPv6 link-local address。例如，如果编译并运行该程序，命令行输入：

./convert_mac_to_ipv6_link_local_address c6:8b:35:39:cb:ab

则输出：

IPv6 link-local address: fe80::c48b:35ff:fe39:cbab