如何用C++发送自定义ICMP请求

要使用C++发送自定义ICMP请求，您需要使用原始套接字（raw sockets）

#include<iostream>#include <cstring>#include <sys/socket.h>#include <netinet/ip.h>#include <netinet/ip_icmp.h>#include <arpa/inet.h>#include <unistd.h>const int ICMP_PACKET_SIZE = 64;void createIcmpHeader(icmphdr &icmpHeader, int type, int code) {    icmpHeader.type = type;    icmpHeader.code = code;    icmpHeader.checksum = 0;}uint16_t calculateChecksum(icmphdr &icmpHeader) {    uint32_t sum = 0;    uint16_t *buf = (uint16_t *)&icmpHeader;    uint16_t size = sizeof(icmpHeader);    while (size > 1) {        sum += *(buf++);        size -= 2;    }    if (size) {        sum += *(uint8_t *)buf;    }    while (sum >> 16) {        sum = (sum & 0xffff) + (sum >> 16);    }    return (uint16_t)(~sum);}int main() {    int rawSocket;    struct sockaddr_in targetAddress;    char datagram[ICMP_PACKET_SIZE];    // 创建原始套接字    if ((rawSocket = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP)) == -1) {        std::cerr << "Failed to create raw socket"<< std::endl;        return 1;    }    // 设置目标地址    targetAddress.sin_family = AF_INET;    targetAddress.sin_addr.s_addr = inet_addr("8.8.8.8"); // 更改为您想要发送ICMP请求的IP地址    // 创建ICMP头部    icmphdr *icmpHeader = (icmphdr *)datagram;    createIcmpHeader(*icmpHeader, ICMP_ECHO, 0);    // 计算校验和    icmpHeader->checksum = calculateChecksum(*icmpHeader);    // 发送ICMP请求    if (sendto(rawSocket, datagram, ICMP_PACKET_SIZE, 0, (struct sockaddr *)&targetAddress, sizeof(targetAddress)) <= 0) {        std::cerr << "Failed to send ICMP request"<< std::endl;        return 1;    }    std::cout << "ICMP request sent successfully!"<< std::endl;    close(rawSocket);    return 0;}

这个示例代码创建了一个原始套接字，然后构建并发送一个ICMP回显请求（ping请求）。请注意，运行此代码可能需要root权限。在运行之前，请确保将目标IP地址更改为您想要发送ICMP请求的IP地址。

在Linux上编译和运行此代码：

g++ -o icmp_request icmp_request.cppsudo ./icmp_request

此代码仅作为示例，实际应用中可能需要根据需求进行修改。