tcpserver.c
01 /**
02 * Tcp Server program, It is a simple example only.
03 * zhengsh 200520602061 2
04 * when client connect to server, send a welcome message and timestamp in server.
05 */
06
07 #include
08 #include
09 #include
10 #include
11 #include in.h>
12 #include
13 #include
14
15 #define SERVER_PORT 20000 // define the defualt connect port id
16 #define LENGTH_OF_LISTEN_QUEUE 10 // length of listen queue in server
17 #define BUFFER_SIZE 255
18 #define WELCOME_MESSAGE "welcome to connect the server. "
19
20 int main(int argc, char** argv)
21 {
22 int servfd,clifd;
23 struct sockaddr_in servaddr,cliaddr;
24
25 if ((servfd = socket(AF_INET,SOCK_STREAM, 0 )) < 0 )
26 {
27 printf( " create socket error!\n " );
28 exit( 1 );
29 }
30
31 bzero( & servaddr, sizeof (servaddr));
32
33 servaddr.sin_family = AF_INET;
34 servaddr.sin_port = htons(SERVER_PORT);
35 servaddr.sin_addr.s_addr = htons(INADDR_ANY);
36
37 if (bind(servfd,( struct sockaddr * ) & servaddr, sizeof (servaddr)) < 0 )
38 {
39 printf( " bind to port %d failure!\n " ,SERVER_PORT);
40 exit( 1 );
41 }
42
43 if (listen(servfd,LENGTH_OF_LISTEN_QUEUE) < 0 )
44 {
45 printf( " call listen failure!\n " );
46 exit( 1 );
47 }
48
49 while ( 1 )
50 { // server loop will nerver exit unless any body kill the process
51
52 char buf[BUFFER_SIZE];
53 long timestamp;
54 socklen_t length = sizeof (cliaddr);
55 clifd = accept(servfd,( struct sockaddr * ) & cliaddr, & length);
56
57 if (clifd < 0 )
58 {
59 printf( " error comes when call accept!\n " );
60 break ;
61 }
62
63 strcpy(buf,WELCOME_MESSAGE);
64
65 // inet_ntop(INET_ADDRSTRLEN,cliaddr.sin_addr,buf,BUFFER_SIZE);
66
67 printf( " from client,IP:%s,Port:%d\n " ,
68 inet_ntoa(cliaddr.sin_addr),ntohs(cliaddr.sin_port));
69
70 timestamp = time(NULL);
71
72 strcat(buf, " timestamp in server: " );
73 strcat(buf,ctime( & timestamp));
74
75 send(clifd,buf,BUFFER_SIZE, 0 );
76
77 close(clifd);
78
79 } // exit
80
81 close(servfd);
82
83 return 0 ;
84 }
[代码] tcpclient.c
01 /**
02 * Tcp client program, It is a simple example only.
03 * zhengsh 200520602061 2
04 * connect to server, and echo a message from server.
05 */
06
07
08 #include
09 #include
10 #include
11 #include
12 #include in.h>
13 #include
14
15
16 #define SERVER_PORT 20000 // define the defualt connect port id
17 #define CLIENT_PORT ((20001+rand())%65536) // define the defualt client port as a random port
18 #define BUFFER_SIZE 255
19 #define REUQEST_MESSAGE "welcome to connect the server.\n"
20
21
22 void usage(char* name)
23 {
24 printf( " usage: %s IpAddr\n " ,name);
25 }
26
27
28 int main(int argc, char** argv)
29 {
30 int servfd,clifd,length = 0;
31 struct sockaddr_in servaddr,cliaddr;
32 socklen_t socklen = sizeof (servaddr);
33 char buf[BUFFER_SIZE];
34
35 if (argc < 2 )
36 {
37 usage(argv[ 0 ]);
38 exit( 1 );
39 }
40
41 if ((clifd = socket(AF_INET,SOCK_STREAM, 0 )) < 0 )
42 {
43 printf( " create socket error!\n " );
44 exit( 1 );
45 }
46
47 srand(time(NULL)); // initialize random generator
48
49 bzero( & cliaddr, sizeof (cliaddr));
50 cliaddr.sin_family = AF_INET;
51 cliaddr.sin_port = htons(CLIENT_PORT);
52 cliaddr.sin_addr.s_addr = htons(INADDR_ANY);
53
54 bzero( & servaddr, sizeof (servaddr));
55 servaddr.sin_family = AF_INET;
56 inet_aton(argv[ 1 ], & servaddr.sin_addr);
57 servaddr.sin_port = htons(SERVER_PORT);
58 // servaddr.sin_addr.s_addr = htons(INADDR_ANY);
59
60 if (bind(clifd, (struct sockaddr* ) &cliaddr, sizeof (cliaddr)) < 0 )
61 {
62 printf( " bind to port %d failure!\n " ,CLIENT_PORT);
63 exit( 1 );
64 }
65
66 if (connect(clifd,( struct sockaddr * ) & servaddr, socklen) < 0 )
67 {
68 printf( " can't connect to %s!\n ", argv[ 1 ]);
69 exit( 1 );
70 }
71
72 length = recv(clifd, buf, BUFFER_SIZE, 0);
73 if (length < 0)
74 {
75 printf( " error comes when recieve data from server %s! ", argv[1] );
76 exit( 1 );
77 }
78
79 printf( " from server %s :\n\t%s", argv[1], buf);
80
81 close(clifd);
82 return 0;
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