从C语言的任意特定CIDR范围中选择随机IP

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main() {
    srand(time(NULL));

    // 定义CIDR范围
    char cidr[] = "192.168.0.0/24";

    // 提取IP地址和网络前缀长度
    char *ip = strtok(cidr, "/");
    int prefixLength = atoi(strtok(NULL, "/"));

    // 解析IP地址的每个部分
    int ipPart1, ipPart2, ipPart3, ipPart4;
    sscanf(ip, "%d.%d.%d.%d", &ipPart1, &ipPart2, &ipPart3, &ipPart4);

    // 计算起始IP地址和结束IP地址
    int startIP = (ipPart1 << 24) | (ipPart2 << 16) | (ipPart3 << 8) | ipPart4;
    int endIP = startIP + (1 << (32 - prefixLength)) - 1;

    // 生成随机IP地址
    int randomIP = startIP + rand() % (endIP - startIP + 1);

    // 将随机IP地址转换为IP地址格式
    ipPart1 = (randomIP >> 24) & 255;
    ipPart2 = (randomIP >> 16) & 255;
    ipPart3 = (randomIP >> 8) & 255;
    ipPart4 = randomIP & 255;

    // 打印随机IP地址
    printf("Random IP: %d.%d.%d.%d\n", ipPart1, ipPart2, ipPart3, ipPart4);

    return 0;
}