做这个项目是首先用到了socket网路编程，然后在这个网络编程框架的基础上添加一些内容。
内容：
0.登录用户，客户端才可访问服务器
1.客户端展示服务器有那些文件
2.客户端展示服务器当前路径
3.客户端进入服务器的某个文件
4.客户端获取服务器的文件
5.客户端上传文件到服务器
其中用到了这些函数：
strstr（） 查字串
strcmp（） 比较
strcpy（） 拷贝
strtok（） 分割
popen（） 启动另外一个进程去执行一个shell命令行
fread（） 读取popen的结果
chdir（） 改变当前工作目录
access（） 判断指定的文件或目录是否存在
open（） 打开或创建文件
read（） 读取数据
write（） 写数据
close（） 关闭文件
例子：
服务端:
#include#include #include #include #include #include"config.h" #include #include #include #include char* strtok_cmd(char* cmd) { char* p; p=strtok(cmd," "); p=strtok(NULL," "); return p; } void get_read(struct Msg msg,int c_fd) { int fp; char* file; file=strtok_cmd(msg.date); fp=open(file,O_RDWR|O_CREAT,0600); write(fp,msg.readbuf,strlen(msg.readbuf)); close(fp); } int server_msg(char* cmd) { if(!strcmp("ls",cmd)) return LS; if(!strcmp("pwd",cmd)) return PWD; if(!strcmp("quit",cmd)) return QUIT; if(strstr(cmd,"cd")!=NULL) return CD; if(strstr(cmd,"get")!=NULL) return GET; if(strstr(cmd,"put")!=NULL) return PUT; } void write_handler(struct Msg msg,int c_fd) { FILE *fp; char* p; char* file; int filefp; char readbuf[1024]; printf("cmd:%sn",msg.date); printf("put:%sn",msg.readbuf); printf("type:%sn",msg.type); int ret=server_msg(msg.date); switch(ret){ case LS: case PWD: fp=popen(msg.date,"r"); memset(msg.date,0,sizeof(msg.date)); fread(msg.date,sizeof(msg.date),1,fp); write(c_fd,&msg,sizeof(msg)); printf("%sn",msg.date); break; case CD: p=strtok_cmd(msg.date); printf("dir:%sn",msg.date); chdir(p); break; case GET: file=strtok_cmd(msg.date); if(access(file,F_OK)==-1){ strcmp(msg.date,"no filen"); write(c_fd,&msg,sizeof(msg)); } else{ filefp=open(file,O_RDWR); read(filefp,readbuf,sizeof(readbuf)); close(filefp); write(c_fd,readbuf,strlen(readbuf)); } break; case PUT: get_read(msg,c_fd); break; case QUIT: printf("quit outn"); exit(-1); } } int main(int argc,char** argv) { int s_fd; int c_fd; struct sockaddr_in s_addr; struct sockaddr_in c_addr; struct Msg msg; if(argc!=3){ printf("argc no 3n"); } s_fd=socket(AF_INET,SOCK_STREAM ,0); s_addr.sin_family=AF_INET; s_addr.sin_port=htons(atoi(argv[2])); inet_aton(argv[1],&s_addr.sin_addr); bind(s_fd,(struct sockaddr *)&s_addr,sizeof(struct sockaddr_in)); listen(s_fd,10); int len=sizeof(struct sockaddr_in); while(1){ c_fd=accept(s_fd,(struct sockaddr *)&c_addr,&len); if(c_fd==-1){ perror("accept"); exit(-1); } printf("connect:%sn",inet_ntoa(s_addr.sin_addr)); if(fork()==0){ while(1){ memset(msg.date,0,sizeof(msg.date)); int n_read=read(c_fd,&msg,sizeof(msg)); if(n_read==-1){ perror("read"); exit(-1); } else{ write_handler(msg,c_fd); } } } } close(c_fd); close(s_fd); return 0; }
客户端：
#include#include #include #include #include #include #include #include"config1.h" #include #include int get_lock() { char name[128]; char lock[128]; while(1){ printf("Username:n"); scanf("%s",name); printf("Password:n"); scanf("%s",lock); if(!strcmp("CLC",name) && !strcmp("1",lock)){ return 1; }else{ printf("Username or Password errorn"); } } } char* strtok_cmd(char* cmd) { char* p; p=strtok(cmd," "); p=strtok(NULL," "); return p; } void get_read(struct Msg msg,int c_fd) { int fp; int n_read; char* file; char msgget[1024]={0}; n_read=read(c_fd,msgget,sizeof(msgget)); if(n_read==0){ printf("server in outn"); exit(-1); } else{ file=strtok_cmd(msg.date); fp=open(file,O_RDWR|O_CREAT,0600); write(fp,msgget,strlen(msgget)); close(fp); } } void read_handler(struct Msg msg,int c_fd) { int n_read; struct Msg msgget; n_read=read(c_fd,&msgget,sizeof(msgget)); if(n_read==0){ printf("server in outn"); exit(-1); } else{ printf("-----------------------n"); printf("n%sn",msgget.date); printf("-----------------------n"); } } int get_cmd_type(char *cmd) { if(strstr(cmd,"lcd")!=NULL) return LCD; if(!strcmp("ls",cmd)) return LS; 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,"lls")!=NULL) return LLS; if(strstr(cmd,"put")!=NULL) return PUT; return -1; } int write_handler(struct Msg msg,int c_fd) { int fp; char* file; char* dir; printf("cmd: %sn",msg.date); int ret=get_cmd_type(msg.date); switch(ret){ case LS: case CD: case PWD: write(c_fd,&msg,sizeof(msg)); break; case LLS: system("ls"); break; case LCD: dir=strtok_cmd(msg.date); chdir(dir); break; case GET: write(c_fd,&msg,sizeof(msg)); get_read(msg,c_fd); break; case PUT: strcpy(msg.type,msg.date); file=strtok_cmd(msg.type); if(access(file,F_OK)==-1){ strcpy(msg.date,"no filen"); write(c_fd,&msg,sizeof(msg)); } else{ memset(msg.readbuf,0,sizeof(msg.readbuf)); fp=open(file,O_RDWR); read(fp,msg.readbuf,sizeof(msg.readbuf)); close(fp); write(c_fd,&msg,sizeof(msg)); } break; case QUIT: strcpy(msg.date,"quit"); write(c_fd,&msg,sizeof(msg)); close(c_fd); exit(-1); } return ret; } int main(int argc,char** argv) { int c_fd; int n_read; int n=0; struct sockaddr_in c_addr; struct Msg msg; if(argc!=3){ printf("argv no 3n"); } c_fd=socket(AF_INET,SOCK_STREAM,0); if(c_fd==-1){ perror("socket"); } c_addr.sin_family=AF_INET; c_addr.sin_port=htons(atoi(argv[2])); inet_aton(argv[1],&c_addr.sin_addr); if(connect(c_fd,(struct sockaddr *)&c_addr,sizeof(struct sockaddr_in))==-1){ perror("connecut"); exit(-1); } printf("connect ..n"); n=get_lock(); getchar(); while(n){ gets(msg.date); int ret=write_handler(msg,c_fd); if(ret>IFGO){ continue; } if(ret==-1){ printf("conmand notn"); fflush(stdout); continue; } read_handler(msg,c_fd); } return 0; }
