如何用C++發(fā)送自定義ICMP請(qǐng)求

c++
小樊
89
2024-09-10 17:41:42
欄目: 編程語言

要使用C++發(fā)送自定義ICMP請(qǐng)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];

    // 創(chuàng)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;
    }

    // 設(shè)置目標(biāo)地址
    targetAddress.sin_family = AF_INET;
    targetAddress.sin_addr.s_addr = inet_addr("8.8.8.8"); // 更改為您想要發(fā)送ICMP請(qǐng)求的IP地址

    // 創(chuàng)建ICMP頭部
    icmphdr *icmpHeader = (icmphdr *)datagram;
    createIcmpHeader(*icmpHeader, ICMP_ECHO, 0);

    // 計(jì)算校驗(yàn)和
    icmpHeader->checksum = calculateChecksum(*icmpHeader);

    // 發(fā)送ICMP請(qǐng)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;
}

這個(gè)示例代碼創(chuàng)建了一個(gè)原始套接字，然后構(gòu)建并發(fā)送一個(gè)ICMP回顯請(qǐng)求（ping請(qǐng)求）。請(qǐng)注意，運(yùn)行此代碼可能需要root權(quán)限。在運(yùn)行之前，請(qǐng)確保將目標(biāo)IP地址更改為您想要發(fā)送ICMP請(qǐng)求的IP地址。

在Linux上編譯和運(yùn)行此代碼：

g++ -o icmp_request icmp_request.cpp
sudo ./icmp_request

此代碼僅作為示例，實(shí)際應(yīng)用中可能需要根據(jù)需求進(jìn)行修改。

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