一个子进程负责一条连接通道
客户端支持的指令:
远程控制:
1、获取服务器当前路径的文件:get xxx
2、 展示服务器有哪些文件:ls
3、进入服务器某文件夹 :cd xxx
4、上传文件到服务器: put xxx
本地控制:
1、查看本地客户端文件 :lls
2、查看进入客户端文件夹 :lcd
服务器:解析指令(创建子进程、对接客户端)
1、创建套接字socket
2、绑定bind ip+端口号
3、listen监听
while(1)调用accept
4、accept接受客户端请求,返回值小于0报错
①、有客户端接入调用fork创建子进程,返回值小于 0 报错;等于 0 对客户端进行交互。
②、对(buf)读取出来的数据做判断(ls、get、cd、pwd)
①)get:open打开文件,read文件,send文件到客户端
②)ls:popen文件,fread读取文件,send发送文件到客户端
// system()调用副服务器:
在子进程中:
1、接收指令
2、把指令写入共享内存 + get pid
3、读取结果共享内存
4、读到的结果返回客户端
在副服务器中:
1、读取共享内存(指令共享内存)
2、发现两次指令不一样,执行结果存入结果共享内存
客户端:发指令
1、socket创建套接字
2、connect连接服务器
3、连接上以后获取用户的输入,对输入的信息进行处理
客户端client代码
#include
#include
#include
//#include
#include
#include
#include
#include
#include
#include
#include
char * getdir(char *cmd)
{
char *p;
p = strtok(cmsg," ");//分割字符串,用空格分隔
p = strtok(NULL," ");
return p;
}
int get_cmd_type(char *cmd)
{
if(strstr(cmd,"lcd")!=NULL) return LCD;
if(!strcmp("lls",cmd)) return LLS;
if(!strcmp("ls",cmd)) return LS; //宏定义
if(!strcmp("quit",cmd)) return QUIT;
if(!strcmp("pwd",cmd)) return PWD;
if(strstr(cmd,"cd")!=NULL) return CD;
if(strstr(cmd,"get")!=NULL) return GET;
if(strstr(cmd,"put")!=NULL) return PUT;
return -1;
}
int cmd_handler(struct Msg msg,int fd)
{
char *dir = NULL;
char buf[32];
int ret;
int filefd;
ret = get_cmd_type(msg.data);
switch(ret){
case LS:
case CD:
case PWD:
msg.type = 0;
write(fd,&msg,sizeof(msg));
break;
case GET:
msg.type = 2;
write(fd,&msg,sizeof(msg));
break;
case PUT:
strcpy(buf,msg.data);
dir = getdir(buf);
if(access(dir,F_OK == -1)){
printf("%s No exsit !",dir);
}else{
fdfile = open(dir,O_RDWR);
read(filefd,msg.secondBuf,sizeof(msg.secondBuf));
close(filefd);
write(fd,&msg,sizeof(msg));
}
break;
case LLS:
system("ls");
break;
case LCD:
dir = getdir(msg.data);
chdir(dir);
break;
case QUIT:
strcpy(msg.data,"quit");
write(fd,&msg,sizeof(msg));
close(fd);
exit(-1);
}
return ret;
}
void handler_server_message(int c_fd,struct Msg msg)
{
int n_read;
struct Msg msg;
int newfilefd;
n_read = read(c_fd,&msgget,sizeof(msgget));
if(n_read == 0){
printf("server is out,quit \n");
exit(-1);
}else if(msgget.type == DOFILE){
char *p = getdir(msg.data);
newfilefd = open(p,O_RDWR|O_CREAT,0666);
write(newfilefd,msgget,strlen(msgget));
putchar(">");
fflush(stdout);
}else{
printf("......................\n");
printf("\n %s \n",msgget.data);
printf("......................\n");
putchar(">");
fflush(stdout);
}
}
int main(int argc,char **argv)
{
int c_fd;
//定义结构体
struct sockaddr_in c_addr;
struct Msg msg;
//数据清空
memset(&c_addr,0,sizeof(struct sockaddr_in));
if(argc != 3){
printf("param is not good"); //参数不好
exit(-1);
}
//1、创建套接字 socket
c_fd = socket(AF_INET,SOCK_STREAM,0);//用到IPV4,TCP协议,0自动配合起来
if(c_fd == -1){ //返回-1,错误
perror("socket");
exit(-1);
}
c_addr.sin_family = AF_INET; //协议族
c_addr.sin_port = htons(atoi(argv[2])); //端口号,一般为5000--9000
//电脑为x86是小端字节序,网络字节序为大端字节序。所以要进行转换用htons
inet_aton(argv[1],&c_addr.sin_addr);
//把字符串形式的127.0.0.1转换成网络能识别的格式。用 到inet_aton
//2、connect 连接客户端的listen
if(connect(c_fd,(struct sockaddr *)&c_addr,sizeof(struct sockaddr)) == -1){
perror("connect");
exit(-1);
}
printf("connect ....\n");
//printf("get connect : %s\n",inet_ntoa(c_addr.sin_addr));//把网络格式的IP转换为字符格式
int mark = 0;
while(1){
memset(msg.data,0,sizeof(msg.data));//初始化
if(mark == 0) printf(">");
gets(msg.data);
if(strlen(msg.data) == 0){
if(mark == 1){
printf(">");
}
continue;
}
mark = 1;
int ret = cmd_handler(msg,c_fd);
if(ret > IFGO){
putchar(">");
fflush(stdout);
continue;
}
if(ret == -1){
printf("command not \n");
printf(">");
fflush(stdout);
continue;
}
handler_server_message(c_fd,msg);
}
return 0;
}
服务器代码server
#include
#include
#include
//#include
#include
#include
#include
#include
#include
#include
#include
int get_cmd_type(char *cmd)
{
if(!strcmp("ls",cmd)) return LS; //宏定义
if(!strcmp("quit",cmd)) return QUIT;
if(!strcmp("pwd",cmd)) return PWD;
if(strstr(cmd,"cd")!=NULL) return CD;
if(strstr(cmd,"get")!=NULL) return GET;
if(strstr(cmd,"put")!=NULL) return PUT;
return 100;
}
char *getDesDir(char *cmsg)
{
char *p;
p = strtok(cmsg," ");//分割字符串,用空格分隔
p = strtok(NULL," ");
return p;
}
void msg_handler(struct Msg msg,int fd)
{
char dataBuf[1024] = {0};
char *file = NULL;
int fdfile;
//解析指令,把指令转换成想要的整型数
printf("cmd : %s\n",msg.data);
int ret = get_cmd_type(msg.data);
switch(ret){
case LS:
case PWD:
msg.type = 0;
FILE *r = popen(msg.data,"r");
fread(msg.data,sizeof(msg.data),1,r);
write(fd,&msg,sizeof(msg));
break;
case CD:
msg.type = 0;
char *dir = getDesDir(msg.data);//分割字符串
printf("dir : %s\n",dir);
chdir(dir);
break;
case GET:
file = getDesDir(msg.data);
if(access(file,F_OK == -1)){
strcpy(msg.data,"No this file !");
write(fd,&msg,sizeof(msg));
}else{
msg.type = DOFILE;
fdfile = open(file,O_RDWR);
read(fdfile,dataBuf,sizeof(dataBuf));
close(fdfile);
strcpy(msg.data,dataBuf);
write(fd,&msg,sizeof(msg));
}
break;
case PUT:
fdfile = open(getDesDir(msg.data),O_RDWR|O_CREAT,0666);
write(fdfile,msg.secondBuf,strlen(msg.secondBuf));//buf放内容,msg.data放指令
close(fdfile);
break;
case QUIT:
printf("client quit ! \n");
exit(-1);
}
}
int main(int argc,char **argv)//配置端口
{
int s_fd;
int c_fd;
int n_read;
char redBuf[128];
struct sockaddr_in s_addr; //定义结构体
struct sockaddr_in c_addr;
struct Msg msg;
if(argc != 3){
printf("param is not good\n"); //参数不好
exit(-1);
}
//数据清空
memset(&s_addr,0,sizeof(struct sockaddr_in));
memset(&c_addr,0,sizeof(struct sockaddr_in));
//1、创建套接字 socket
s_fd = socket(AF_INET,SOCK_STREAM,0);//用到IPV4,TCP协议,0自动配合起来
if(s_fd == -1){ //返回-1,错误
perror("socket");
exit(-1);
}
//2、添加地址 bind
s_addr.sin_family = AF_INET; //协议族
s_addr.sin_port = htons(atoi(argv[2])); //端口号,一般为5000--9000
//电脑为x86是小端字节序,网络字节序为大端字节序。所以要进行转换用htons
inet_aton(argv[1],&s_addr.sin_addr);
//把字符串形式的127.0.0.1转换成网络能识别的格式。用到inet_aton
bind(s_fd,(struct sockaddr *)&s_addr,sizeof(struct socket_in));
//3、监听listen
listen(s_fd,10);//监听10个
//4、连接 accept
int clen = sizeof(struct socket_in);
while(1){
c_fd = accept(s_fd,(struct sockaddr *)&c_addr ,&clen);
//连接到客户端之后,后续的操作用返回值c_fd来操作
if(c_fd == -1){
perror("accept");
}
printf("get connect : %s\n",inet_ntoa(c_addr.sin_addr));//把网络格式的IP转换为字符格式
//新的客户端接入,创建子进程,一个子进程负责一条连接通道
if(fork() == 0){ //fock返回值=0进入子进程,>0进入父进程
while(1){
memset(retmessage,0,sizeof(retmessage));//初始化
//5、read
n_read = read(c_fd,&msg,sizeof(msg));
if(n_read == 0){
printf("client out !\n");
break;
}else if(n_read > 0){
msg_handler(msg,c_fd);
}
//6、write
}
}
}
close(c_fd);
close(s_fd);
return 0;
}
定义
//msg结构体
#define LS 0
#define GET 1
#define PWD 2
#define IFGO 3
#define LCD 4
#define LLS 5
#define CD 6
#define PUT 7
#define QUIT 8
#define DOFILE 9
struct Msg
{
int type;
char data[1024];
char secondBuf[128];
};