/**
* tcp server program, it is a ****** example only.
* when client connect to server, send a welcome message and timestamp in server.
*/#include #include #include #include #include #include #include #define server_port 20000 // define the defualt connect port id
#define length_of_listen_queue 10 // length of listen queue in server
#define buffer_size 255
#define welcome_message "welcome to connect the server. "
int main(int argc, char** argv)
bzero( & servaddr, sizeof (servaddr));
servaddr.sin_family = af_inet;
servaddr.sin_port = htons(server_port);
servaddr.sin_addr.s_addr = htons(inaddr_any);
if (bind(servfd,( struct sockaddr * ) & servaddr, sizeof (servaddr)) < 0 )
if (listen(servfd,length_of_listen_queue) < 0 )
while(1)
strcpy(buf,welcome_message);
// inet_ntop(inet_addrstrlen,cliaddr.sin_addr,buf,buffer_size);
printf( " from client,ip:%s,port:%d\n " ,
inet_ntoa(cliaddr.sin_addr),ntohs(cliaddr.sin_port));
timestamp = time(null);
strcat(buf, " timestamp in server: " );
strcat(buf,ctime( & timestamp));
send(clifd,buf,buffer_size, 0 );
close(clifd);
} close(servfd);
return 0;
}
/**
* tcp client program, it is a ****** example only.
* connect to server, and echo a message from server.
*/#include #include #include #include #include #include #define server_port 20000 // define the defualt connect port id
#define client_port ((20001+rand())%65536) // define the defualt client port as a random port
#define buffer_size 255
#define reuqest_message "welcome to connect the server.\n"
void usage(char* name)
int main(int argc, char** argv)
if ((clifd = socket(af_inet,sock_stream, 0 )) < 0)
srand(time(null)); // initialize random generator
bzero(&cliaddr, sizeof (cliaddr));
cliaddr.sin_family = af_inet;
cliaddr.sin_port = htons(client_port);
cliaddr.sin_addr.s_addr = htons(inaddr_any);
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = af_inet;
inet_aton(argv[ 1 ], & servaddr.sin_addr);
servaddr.sin_port = htons(server_port);
// servaddr.sin_addr.s_addr = htons(inaddr_any);
if (bind(clifd, (struct sockaddr* ) &cliaddr, sizeof (cliaddr)) < 0)
if (connect(clifd,( struct sockaddr * ) & servaddr, socklen) < 0)
length = recv(clifd, buf, buffer_size, 0);
if (length < 0)
printf("from server %s :\n\t%s", argv[1], buf);
close(clifd);
return 0;
}
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