linux往网卡发原始数据

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

#define PACKET_SIZE 64

int main(int argc, char *argv[]) {
    if (argc != 2) {
        fprintf(stderr, "Usage: %s <IP address>\n", argv[0]);
        return 1;
    }

    int sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
    if (sockfd < 0) {
        perror("socket");
        return 1;
    }

    struct sockaddr_in dest_addr;
    memset(&dest_addr, 0, sizeof(dest_addr));
    dest_addr.sin_family = AF_INET;
    inet_pton(AF_INET, argv[1], &dest_addr.sin_addr);

    char packet[PACKET_SIZE];
    memset(packet, 0, PACKET_SIZE);
    // 构造ICMP Echo请求头部...

    if (sendto(sockfd, packet, PACKET_SIZE, 0, (struct sockaddr *)&dest_addr, sizeof(dest_addr)) < 0) {
        perror("sendto");
        close(sockfd);
        return 1;
    }

    printf("ICMP Echo request sent to %s\n", argv[1]);
    close(sockfd);
    return 0;
}