C++判定终端ip和目标ip是否在同一局域网内

程序如下：用于判断给定的终端 IP、子网掩码和目标 IP 是否在同一局域网内。请注意，这个程序假设 IP 地址是用整数表示的。

cpp 复制代码

#include <iostream>
#include <sstream>
#include <vector>
#include <bitset>

// Function to check if two IPs are in the same network
bool checkSameNetwork(std::string terminalIP, std::string subnetMask, std::string targetIP) {
    // Split the IP strings into octets
    std::istringstream terminalStream(terminalIP), subnetStream(subnetMask), targetStream(targetIP);
    std::vector<int> terminalOctets, subnetOctets, targetOctets;
    std::string octet;

    while (std::getline(terminalStream, octet, '.')) {
        terminalOctets.push_back(std::stoi(octet));
    }

    while (std::getline(subnetStream, octet, '.')) {
        subnetOctets.push_back(std::stoi(octet));
    }

    while (std::getline(targetStream, octet, '.')) {
        targetOctets.push_back(std::stoi(octet));
    }

    // Perform bitwise AND operation on corresponding octets of IP and subnet mask
    for (size_t i = 0; i < 4; ++i) {
        if ((terminalOctets[i] & subnetOctets[i]) != (targetOctets[i] & subnetOctets[i])) {
            return false; // IPs are not in the same network
        }
    }

    return true; // IPs are in the same network
}

int main() {
    std::string terminalIP, subnetMask, targetIP;

    // Input terminal IP, subnet mask, and target IP
    std::cout << "Enter terminal IP: ";
    std::cin >> terminalIP;

    std::cout << "Enter subnet mask: ";
    std::cin >> subnetMask;

    std::cout << "Enter target IP: ";
    std::cin >> targetIP;

    // Check if terminal IP and target IP are in the same network
    bool sameNetwork = checkSameNetwork(terminalIP, subnetMask, targetIP);

    // Output the result
    if (sameNetwork) {
        std::cout << "true\n";
    } else {
        std::cout << "false\n";
    }

    return 0;
}

需要注意的是，此程序假定输入的 IP 地址是以点分十进制表示法给出的，并且子网掩码和 IP 地址都是有效的。此外，它假设 IPv4 地址，每个 IP 地址由四个十进制数构成。在实际生产环境中，还需要对输入进行更严格的验证和错误处理。