udp服务端和客户端程序示例

最新推荐文章于 2024-05-21 22:19:40 发布

vgxpm

最新推荐文章于 2024-05-21 22:19:40 发布

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分类专栏： linux 网络编程 unix 文章标签： udp 服务端程序客户端程序网络编程

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本文详细介绍了UDP协议在客户端和服务端的实现过程，包括socket的创建、绑定、接收和发送数据的操作。

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UDP 服务端：

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

#define BUFFERSIZE 1024

int main( int argc, char* argv[] )
{
    if( argc <= 2 )
    {
        printf( "usage: %s ip_address port_number \n", basename( argv[0] ) );
        return 1;
    }
    const char* ip = argv[1];
    int port = atoi( argv[2] );

	int sockfd;
	struct sockaddr_in server_addr;
	
	sockfd = socket( AF_INET, SOCK_DGRAM, 0 );
	if( sockfd == -1 )
	{
		printf("create sock failed\n");
		return -1;
	}
	
	bzero( &server_addr, sizeof(server_addr) );
	server_addr.sin_family=AF_INET;
	server_addr.sin_port=htons(port);
	//server_addr.sin_addr.s_addr=htonl(INADDR_ANY);
    inet_pton( AF_INET, ip, &server_addr.sin_addr );
	
	if( bind( sockfd, (struct sockaddr *)(&server_addr), sizeof( struct sockaddr_in ) ) == -1 )
	{
		printf( "bind failed\n" );
		return -1;
	}
		
    struct sockaddr_in client_addr;
    socklen_t client_addrlen;
    int nbytes;
	char buf[BUFFERSIZE];
    client_addrlen = sizeof( struct sockaddr );

	while(1)
	{
		bzero( buf, BUFFERSIZE );
		nbytes = recvfrom( sockfd, buf, BUFFERSIZE , 0, ( struct sockaddr* )( &client_addr ), &client_addrlen );
		buf[nbytes]= '\0';
		printf( "Server received:%s\n", buf );
	}

	close(sockfd);
	
	return 0;
}

UDP客户端：

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

#define BUFFERSIZE 1024

int main( int argc,char *argv[] )
{
	int sockfd;
	struct sockaddr_in server_addr;
	
	if( argc <= 2 )
	{
		printf("Arguments error usage: %s ip_address port_number\n", basename( argv[0] ) );
		return -1;
	}
	int port = atoi( argv[2] );

	sockfd = socket( AF_INET, SOCK_DGRAM, 0 );
	if( sockfd == -1 )
	{
		printf("create sock failed\n");
		return -1;
	}
	
	bzero( &server_addr, sizeof( server_addr ) );
	server_addr.sin_family=AF_INET;
	server_addr.sin_port=htons( port );
	
	if( inet_aton( argv[1], &(server_addr.sin_addr)) < 0 )
	{
		printf("transmit error\n");
		return -1;
	}
		
	char buf[BUFFERSIZE];
    socklen_t addrlen = sizeof(struct sockaddr);
	while( 1 )
	{
		printf("please input what you want to say:\n");
		fgets( buf, BUFFERSIZE, stdin );
		sendto( sockfd, buf, BUFFERSIZE, 0, (struct sockaddr *)&server_addr, addrlen );
		bzero( buf, BUFFERSIZE );
	}

	close(sockfd);
	return 0;
}