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/**
* @filename: udp_client.c
* @brief: udp communication
* @author: philia
* @date: 2026/4/18
* @version: ver1.0
* @note 客户端发送消息，后运行
* CopyRight (c) 2026 philia All Right Reseverd
*/
#include <stdio.h>
#include <sys/types.h> /* See NOTES */
#include <sys/socket.h>
#include <netinet/ip.h> /* superset of previous */
#include <arpa/inet.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
int main(int argc, const char *argv[])
{
if (argc != 2)
{
printf("用法：./<文件名> <目标ip地址>\n");
exit(-1);
}
struct sockaddr_in dest_addr;
int udp_socket = socket(AF_INET, SOCK_DGRAM, 0);
if (udp_socket == -1)
{
fprintf(stderr, "udp_socket error, errno:%d,%s", errno, strerror(errno));
exit(-1);
}
dest_addr.sin_family = AF_INET;
dest_addr.sin_port = htons(60001);
dest_addr.sin_addr.s_addr = inet_addr(argv[1]);
char buf[128] = {0};
while(1)
{
scanf(" %[^\n]", buf);
sendto(udp_socket, buf, strlen(buf), 0, (struct sockaddr *)&dest_addr, sizeof(dest_addr));
bzero(buf,sizeof(buf));
}
return 0;
}/**
* @filename: udp_server.c
* @brief: udp communication
* @author: philia
* @date: 2026/4/18
* @version: ver1.0
* @note 服务端接收消息，先运行
* CopyRight (c) 2026 philia All Right Reseverd
*/
#include <stdio.h>
#include <sys/types.h> /* See NOTES */
#include <sys/socket.h>
#include <netinet/ip.h> /* superset of previous */
#include <arpa/inet.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
int main(int argc, const char *argv[])
{
if (argc != 2)
{
printf("用法：./<文件名> <目标ip地址>\n");
exit(-1);
}
struct sockaddr_in host_addr;
struct sockaddr_in src_addr;
socklen_t addr_len = sizeof(src_addr);
int udp_socket = socket(AF_INET, SOCK_DGRAM, 0);
if (udp_socket == -1)
{
fprintf(stderr, "udp_socket error, errno:%d,%s", errno, strerror(errno));
exit(-1);
}
host_addr.sin_family = AF_INET;
host_addr.sin_port = htons(60001);
host_addr.sin_addr.s_addr = inet_addr(argv[1]);
bind(udp_socket,(struct sockaddr*)&host_addr,sizeof(host_addr));
char buf[128] = {0};
while(1)
{
recvfrom(udp_socket,buf,sizeof(buf),0,(struct sockaddr *)&src_addr, &addr_len);
printf("recv data is [%s]\n",buf);
printf("from IP: %s, port: %d\n",
inet_ntoa(src_addr.sin_addr),
ntohs(src_addr.sin_port));
bzero(buf,sizeof(buf));
}
return 0;
}
