实验内容：
编写程序，实现Linux下的socket编程
代码:
#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <errno.h>
#include <string.h>
#include <arpa/inet.h>
#include <unistd.h>
#define MAXLINE 1024
int main(int argc,char **argv)
{
char *servInetAddr = "127.0.0.1";
int socketfd;
struct sockaddr_in sockaddr;
char recvline[MAXLINE], sendline[MAXLINE];
int n;
printf(“inpute the message\n");
if(argc != 2)
{
printf("client connect success \n");
exit(0);
}
socketfd = socket(AF_INET,SOCK_STREAM,0);
memset(&sockaddr,0,sizeof(sockaddr));
sockaddr.sin_family = AF_INET;
sockaddr.sin_port = htons(10004);
inet_pton(AF_INET,servInetAddr,&sockaddr.sin_addr)
if((connect(socketfd,(struct sockaddr*)&sockaddr,sizeof(sockaddr))) < 0 )
{
printf("connect error %s errno: %d\n",strerror(errno),errno);
exit(0);
}
printf("send message to server\n");
fgets(sendline,1024,stdin);
if((send(socketfd,sendline,strlen(sendline),0)) < 0)
{
printf("send mes error: %s errno : %d",strerror(errno),errno);
exit(0);
}
close(socketfd);
printf("exit\n");
exit(0);
}
#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <string.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <arpa/inet.h>
#define MAXLINE 1024
int main(int argc,char **argv)
{
int listenfd,connfd;
struct sockaddr_in sockaddr;
char buff[MAXLINE];
int n;
memset(&sockaddr,0,sizeof(sockaddr));
sockaddr.sin_family = AF_INET;
sockaddr.sin_addr.s_addr = htonl(INADDR_ANY);
sockaddr.sin_port = htons(10004);
listenfd = socket(AF_INET,SOCK_STREAM,0);
bind(listenfd,(struct sockaddr *) &sockaddr,sizeof(sockaddr));
listen(listenfd,1024);
for(;;)
{
if((connfd = accept(listenfd,(struct sockaddr*)NULL,NULL))==-1)
{
printf("accpet socket error: %s errno :%d\n",strerror(errno),errno);
continue;
}
n = recv(connfd,buff,MAXLINE,0);
buff[n] = '\0';
printf("recv msg from client:%s",buff);
close(connfd);
}
close(listenfd);
}
实现截图：
二 多线程实现
实现代码：
#include <netinet/in.h> // for sockaddr_in
#include <sys/types.h> // for socket
#include <sys/socket.h> // for socket
#include <stdio.h> // for printf
#include <stdlib.h> // for exit
#include <string.h> // for bzero
#include <unistd.h>
/*
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
*/
#define HELLO_WORLD_SERVER_PORT 6666
#define LENGTH_OF_LISTEN_QUEUE 20
#define BUFFER_SIZE 1024
#define FILE_NAME_MAX_SIZE 512
#define FILE_WORDS_NUMBER 32
int wc_func(char *file_name);
int main(int argc, char **argv)
{
//设置一个socket地址结构server_addr,代表服务器internet地址, 端口
struct sockaddr_in server_addr;
bzero(&server_addr,sizeof(server_addr)); //把一段内存区的内容全部设置为0
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htons(INADDR_ANY);
server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
//创建用于internet的流协议(TCP)socket,用server_socket代表服务器socket
int server_socket = socket(PF_INET,SOCK_STREAM,0);
if( server_socket < 0)
{
printf("Create Socket Failed!");
exit(1);
}
//把socket和socket地址结构联系起来
if( bind(server_socket,(struct sockaddr*)&server_addr,sizeof(server_addr)))
{
printf("Server Bind Port : %d Failed!", HELLO_WORLD_SERVER_PORT);
exit(1);
}
//server_socket用于监听
if ( listen(server_socket, LENGTH_OF_LISTEN_QUEUE) )
{
printf("Server Listen Failed!");
exit(1);
}
while (1) //服务器端要一直运行
{
//定义客户端的socket地址结构client_addr
struct sockaddr_in client_addr;
socklen_t length = sizeof(client_addr);
//接受一个到server_socket代表的socket的一个连接
//如果没有连接请求,就等待到有连接请求--这是accept函数的特性
//accept函数返回一个新的socket,这个socket(new_server_socket)用于同连接到的客户的通信
//new_server_socket代表了服务器和客户端之间的一个通信通道
//accept函数把连接到的客户端信息填写到客户端的socket地址结构client_addr中
int new_server_socket = accept(server_socket,(struct sockaddr*)&client_addr,&length);
if ( new_server_socket < 0)
{
printf("Server Accept Failed!\n");
break;
}
char file_name[FILE_NAME_MAX_SIZE+1];
bzero(file_name, FILE_NAME_MAX_SIZE+1);
char buffer[BUFFER_SIZE];
bzero(buffer,BUFFER_SIZE);
recv(new_server_socket,file_name,BUFFER_SIZE,0);
FILE * fp = fopen(file_name,"w");
if(NULL == fp )
{
printf("File:\t%s Can Not Open To Write\n", file_name);
exit(1);
}
//从客户端接收数据到buffer中
bzero(buffer,BUFFER_SIZE);
int len = 0;
while( len = recv(new_server_socket,buffer,BUFFER_SIZE,0))
{
if(len < 0)
{
printf("Recieve Data From Client %s Failed!\n", argv[1]);
break;
}
int write_length = fwrite(buffer,sizeof(char),len,fp);
if (write_length<len)
{
printf("File:\t%s Write Failed\n", file_name);
break;
}
bzero(buffer,BUFFER_SIZE);
}
printf("File:\t%s Transfer Finished!\n",file_name);
fclose(fp);
//关闭与客户端的连接
close(new_server_socket);
}
//关闭监听用的socket
close(server_socket);
return 0;
}
#include <netinet/in.h> // for sockaddr_in
#include <sys/types.h> // for socket
#include <sys/socket.h> // for socket
#include <stdio.h> // for printf
#include <stdlib.h> // for exit
#include <string.h> // for bzero
#include <unistd.h>
/*
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
*/
#define HELLO_WORLD_SERVER_PORT 6666
#define BUFFER_SIZE 1024
#define FILE_NAME_MAX_SIZE 512
#define FILE_WORDS_NUMBER 32
int main(int argc, char **argv)
{
if (argc != 2)
{
printf("Usage: ./%s ServerIPAddress\n",argv[0]);
exit(1);
}
//设置一个socket地址结构client_addr,代表客户机internet地址, 端口
struct sockaddr_in client_addr;
bzero(&client_addr,sizeof(client_addr)); //把一段内存区的内容全部设置为0
client_addr.sin_family = AF_INET; //internet协议族
client_addr.sin_addr.s_addr = htons(INADDR_ANY);//INADDR_ANY表示自动获取本机地址
client_addr.sin_port = htons(0); //0表示让系统自动分配一个空闲端口
//创建用于internet的流协议(TCP)socket,用client_socket代表客户机socket
int client_socket = socket(AF_INET,SOCK_STREAM,0);
if( client_socket < 0)
{
printf("Create Socket Failed!\n");
exit(1);
}
//把客户机的socket和客户机的socket地址结构联系起来
if( bind(client_socket,(struct sockaddr*)&client_addr,sizeof(client_addr)))
{
printf("Client Bind Port Failed!\n");
exit(1);
}
//设置一个socket地址结构server_addr,代表服务器的internet地址, 端口
struct sockaddr_in server_addr;
bzero(&server_addr,sizeof(server_addr));
server_addr.sin_family = AF_INET;
if(inet_aton(argv[1],&server_addr.sin_addr) == 0) //服务器的IP地址来自程序的参数
{
printf("Server IP Address Error!\n");
exit(1);
}
server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
socklen_t server_addr_length = sizeof(server_addr);
//向服务器发起连接,连接成功后client_socket代表了客户机和服务器的一个socket连接
if(connect(client_socket,(struct sockaddr*)&server_addr, server_addr_length) < 0)
{
printf("Can Not Connect To %s!\n",argv[1]);
exit(1);
}
char file_name[FILE_NAME_MAX_SIZE+1];
bzero(file_name, FILE_NAME_MAX_SIZE+1);
printf("Please Input File Name On Server:\t");
scanf("%s", file_name);
char buffer[BUFFER_SIZE];
bzero(buffer,BUFFER_SIZE);
strncpy(buffer, file_name, strlen(file_name)>BUFFER_SIZE?BUFFER_SIZE:strlen(file_name));
//向服务器发送buffer中的数据
send(client_socket,buffer,BUFFER_SIZE,0);
FILE * fp = fopen(file_name,"r");
if(NULL == fp )
{
printf("File:\t%s Not Found\n", file_name);
exit(1);
}
else
{
bzero(buffer, BUFFER_SIZE);
int file_block_length = 0;
while( (file_block_length = fread(buffer,sizeof(char),BUFFER_SIZE, fp))>0)
{
//printf("file_block_length = %d\n",file_block_length);
//发送buffer中的字符串到服务器
if(send(client_socket,buffer,file_block_length,0)<0)
{
printf("Send File:\t%s Failed\n", file_name);
break;
}
bzero(buffer, BUFFER_SIZE);
}
}
printf("Send File:\t %s To Server[%s] Finished\n",file_name, argv[1]);
printf("The File has %d words.\n", wc_func(file_name));
fclose(fp);
//关闭socket
close(client_socket);
return 0;
}
int wc_func(char *file_name)
{
int t;
int w = 0;
int state = 0;
FILE *in;
if((in = fopen(file_name,"r"))==NULL)
{
printf("wc %s:no this file or dir\n",file_name);
return;
}
while((t=fgetc(in))!=EOF)
{
if(t=='\n'||t==' '||t=='\r') {
state = 0;
continue;
} else {
if(state == 0) {
state = 1;
w++;
}
continue;
}
}
return w;
}
运行结果：
