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.cpp sudo ./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。