在c++中创建数据包嗅探器

#include <iostream>
#include <pcap.h>

void packetHandler(unsigned char* userData, const struct pcap_pkthdr* pkthdr, const unsigned char* packetData) {
    // 处理数据包
    // 可以在这里进行数据包解析、提取信息等操作
}

int main() {
    char errbuf[PCAP_ERRBUF_SIZE];
    pcap_t* handle;

    // 打开网络接口
    handle = pcap_open_live("eth0", BUFSIZ, 1, 1000, errbuf);
    if (handle == nullptr) {
        std::cout << "Error opening interface: " << errbuf << std::endl;
        return 1;
    }

    // 设置过滤规则（可选）
    struct bpf_program fp;
    std::string filter = "tcp port 80";
    if (pcap_compile(handle, &fp, filter.c_str(), 0, PCAP_NETMASK_UNKNOWN) == -1) {
        std::cout << "Error compiling filter: " << pcap_geterr(handle) << std::endl;
        return 1;
    }
    if (pcap_setfilter(handle, &fp) == -1) {
        std::cout << "Error setting filter: " << pcap_geterr(handle) << std::endl;
        return 1;
    }

    // 开始捕获数据包
    pcap_loop(handle, 0, packetHandler, nullptr);

    // 关闭嗅探器
    pcap_close(handle);

    return 0;
}