linux下怎样发送报文

ping www.example.com

traceroute www.example.com
# 或者
tracepath www.example.com

echo "Hello, World!" | nc -u www.example.com 12345

echo "Hello, World!" | nc www.example.com 12345

echo "Hello, World!" | socat - UDP:www.example.com:12345

echo "Hello, World!" | socat - TCP:www.example.com:12345

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

int main() {
    int sockfd;
    struct sockaddr_in servaddr;
    char *message = "Hello, World!";

    // 创建UDP套接字
    if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
        perror("socket creation failed");
        exit(EXIT_FAILURE);
    }

    memset(&servaddr, 0, sizeof(servaddr));

    // 配置服务器地址
    servaddr.sin_family = AF_INET;
    servaddr.sin_port = htons(12345);
    servaddr.sin_addr.s_addr = inet_addr("93.184.216.34"); // www.example.com的IP地址

    // 发送报文
    sendto(sockfd, (const char *)message, strlen(message), MSG_CONFIRM, (const struct sockaddr *) &servaddr, sizeof(servaddr));

    close(sockfd);
    return 0;
}

curl -X POST -d "Hello, World!" http://www.example.com/api