服務器端:
#include<sys/types.h>
#include<sys/socket.h>
#include<stdio.h>
#include<stdlib.h>
#include<errno.h>
#include<string.h>
#include<unistd.h>
#include<netinet/in.h>
#define PORT 4321 //端口號
#define BUFFER_SIZE 1024 //緩衝區大小
#define MAX_QUE_CONN_NM 5
int main()
{
struct sockaddr_in server_sockaddr,client_sockaddr;//保存Socket信息的結構
int sin_size,recvbytes;
int sockfd,client_fd;
char buf[BUFFER_SIZE];
//建立Socket連接
if((sockfd = socket(AF_INET,SOCK_STREAM,0)) == -1)
{
perror("socket");
exit(1);
}
printf("Socket id = %d/n",sockfd);
//設置sockaddr_in結構體中相關參數
server_sockaddr.sin_family = AF_INET;//IPv4協議
server_sockaddr.sin_port = htons(PORT);//主機字節轉化爲網絡字節(端口號)
server_sockaddr.sin_addr.s_addr = INADDR_ANY;//IP地址
bzero(&(server_sockaddr.sin_zero),8);//置前8個字節爲0
int i = 1;
setsockopt(sockfd,SOL_SOCKET,SO_REUSEADDR,&i,sizeof(i));//設置套接字選項
if(bind(sockfd,(struct sockaddr *)&server_sockaddr,sizeof(struct sockaddr)) == -1)//綁定套接字
{
perror("bind");
exit(1);
}
if(listen(sockfd,MAX_QUE_CONN_NM) == -1)//調用listen()函數,創建未處理請求的隊列
{
perror("listen");
exit(1);
}
printf("Listening....../n");
sin_size = sizeof(client_sockaddr);//調用accept()函數,等待客戶端的連接
if((client_fd = accept(sockfd,(struct sockaddr *)&client_sockaddr,&sin_size)) == -1)
{
perror("accpet");
exit(1);
}
memset(buf,0,sizeof(buf));
if((recvbytes = recv(client_fd,buf,BUFFER_SIZE,0)) == -1)//調用recv()函數接收客戶端的請求
{
perror("recv");
exit(1);
}
printf("Received a message: %s/n",buf);
close(sockfd);
exit(0);
}
客戶端:
#include<sys/types.h>
#include<sys/socket.h>
#include<stdio.h>
#include<stdlib.h>
#include<errno.h>
#include<string.h>
#include<unistd.h>
#include<netinet/in.h>
#define PORT 4321
#define BUFFER_SIZE 1024
int main(int argc,char *argv[])
{
int sockfd,sendbytes;
char buf[BUFFER_SIZE];
struct hostent *host;
struct sockaddr_in serv_addr;
if(argc < 3)
{
fprintf(stderr,"USAGE:./client Hostname(or ip address)Text/n");
exit(1);
}
if((host = gethostbyname(argv[1])) == NULL)//地址解析函數
{
perror("gethostbyname");
exit(1);
}
memset(buf,0,sizeof(buf));
sprintf(buf,"%s",argv[2]);
if((sockfd = socket(AF_INET,SOCK_STREAM,0)) == -1)//創建Socket
{
perror("socket");
exit(1);
}
//設置sockaddr_in結構體相關參數
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(PORT);
serv_addr.sin_addr = *((struct in_addr *)host->h_addr);
bzero(&(serv_addr.sin_zero),8);
//調用connect()函數主動發起對服務器端的連接
if(connect(sockfd,(struct sockaddr *)&serv_addr,sizeof(struct sockaddr)) == -1)
{
perror("connect");
exit(1);
}
if((sendbytes = send(sockfd,buf,strlen(buf),0)) == -1)//發送消息給服務器端
{
perror("send");
exit(1);
}
close(sockfd);
exit(0);
}