採用UDP協議實現客戶端與服務端的通訊

實驗要求

實驗環境

red hat 9

**udpclient.c

#include

#include
#include
#include
#include
#include
#include
#include
#define port 8900
void
print_usage
(char
* cmd)
intmain
(int argc,
char
** ar**)if(
3==argc)if(
-1==(sockfd=
socket
(af_inet,sock_dgram,0)
))//change
memset
(&server,0,
sizeof
(struct sockaddr_in));
server.sin_family = af_inet;
server.sin_addr.s_addr =
inet_addr
(ar**[1]
);server.sin_port =
htons
(port);if
(0>
(ret=
connect
(sockfd,
(struct sockaddr*
)&server,
sizeof
(struct sockaddr)))
)//memset(send_buf,0,2048);
//memset(recv_buf,0,2048);
while(1
)if(0
>
(len=
recvfrom
(sockfd,recv_buf,
sizeof
(recv_buf),0
,(struct sockaddr *
)&server,
&addr_len)))
recv_buf[len]
='\0'
;printf
("the message from the server is:%s\n"
,recv_buf);}
close
(sockfd)
;}

#include

#include
#include
#include
#include
#include
#include
#include
//#define port 8900
void
print_usage
(char
* cmd)
intmain
(int argc,
char
** ar**)if(
2==argc)
//port= port;
memset
(send_buf,0,
2048);
memset
(recv_buf,0,
2048);
opt = so_reuseaddr;if(
-1==(sockfd=
socket
(af_inet,sock_dgram,0)
))//change
/* setsockopt(listend,sol_socket,so_reuseaddr,&opt,sizeof(opt));
#ifdef debug
printf("the listen id is %d\n",listend);
#endif
*/memset
(&server,0,
sizeof
(struct sockaddr_in));
server.sin_family = af_inet;
server.sin_addr.s_addr =
htonl
(inaddr_any)
; server.sin_port =
htons
(port);if
(-1==
bind
(sockfd,
(struct sockaddr *
)&server,
sizeof
(struct sockaddr)))
/* int addr_len = sizeof(struct sockaddr_in);
recvnum = recvfrom(listend, recv_buf, sizeof(recv_buf), 0, (struct sockaddr *)&client, &addr_len);
recv_buf[recvnum]="\0";
printf("client %s : %s\n", inet_ntoa(client.sin_addr), recv_buf);
if (-1==listen(listend,5))
while (1)
#ifdef debug
printf("the connect id is %d",connect);
printf("the client ip addr is %s",inet_ntoa(client.sin_addr));
#endif
sendnum = sprintf(send_buf,"hello,the guest from %s\n",inet_ntoa(client.sin_addr));
if ( 0 >send(connectd,send_buf,sendnum,0)) 
#ifdef debug
printf("the send num is %d",sendnum);
printf("the client ip addr is %s",inet_ntoa(client.sin_addr));
#endif
*/while(1
)//many messages
recv_buf[recvnum]
='\0'
; printf (
"the message from the client is: %s\n"
,recv_buf);if
(0==strcmp
(recv_buf,
"quit"))
sendnum =
sprintf
(send_buf,
"the message from client is %s\n"
,recv_buf)
;//send(connectd,send_buf,sendnum,0);
sendto
(sockfd, send_buf,
sizeof
(send_buf),0
,(struct sockaddr *
)&client,
sizeof
(client));
//close(connectd);
continue;}
close
(sockfd)
;return0;
}

先將服務端的程式執行起來，注意在執行時要指定埠，實驗中將埠設定為2222；再開兩個終端執行兩個客戶端程式，表示不同的使用者，執行客戶端程式時需指定程式所在計算機的ip位址以及服務端設定的埠。

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