parser.c

自己写的一个ftp client

#include"global.h"
#include"parser.h"
#include"controlmodule.h"
//////////////////////define some usercmd's number//////////////////////////
#define ERROR 0
#define OPEN 1
#define LS 2
#define CD 3
#define GET 4
#define PUT 5
#define quit 100

/////////////////////////////////////divide///////////////////////////////////////////////////////
void getcmdandarg(char *str,char *cmd,char *arg){
	int tag=0;
//	printf("enterring getcmdandarg()\n");
	while( *(str+tag)!=' ' && *(str+tag)!='\0' ){
		tag++;
	}
//	printf("tag:%d\n",tag);
	int tmp=0;
	while(tmp<tag){
		*cmd++=*str++;
		tmp++;
	}
	*(cmd)='\0';
	if( *str=='\0' ){
		*arg='\0';
		return;
		printf("arg empty!\n");
	}
	str++;
//	printf("before get arg\n");
	while(*str!='\0'){
		*arg++=*str++;
	}
	*(arg)='\0';
}

//////////////////////////mapping//////////////////////////////////////////////////////////////
int cmdmappingnum(char *cmd){
	if( strcmp(cmd,"open")==0 )
		return OPEN;
	else if( strcmp(cmd,"quit")==0 )
		return quit;
	else if( strcmp(cmd,"ls")==0 )
		return LS;
	else if( strcmp(cmd,"cd")==0 )
		return CD;
	else if( strcmp(cmd,"get")==0 )
		return GET;
	else if( strcmp(cmd,"put")==0 )
		return PUT;
	else
		return ERROR;
}

/////////////////the following function do paser()'s detail parse/////////////////////////
void doquit(char * arg){
	if(status==DISCONNECTED){
		exit(0);
	}
	int firstrc=ftpcmd("QUIT",NULL);
	if(firstrc!=2){
		printf( "quit failed, you can try again!\n");
	}
	printf("quit\n");
	exit(0);
}

void doopen(char *arg){
	printf("open\n%s\n ",arg);
	strcpy(remoteaddr,arg);
//	char *recbuf= malloc( sizeof(char)*4096 );
	struct linebuf* recbuf=inilinebuf(1024);
	int firstrc;
	//do things for connet to remote
	struct sockaddr_in remote;
	bzero( &remote , sizeof(remote) );
	remote.sin_family=AF_INET;
	remote.sin_port=htons(21);
	inet_pton( AF_INET , remoteaddr , &remote.sin_addr.s_addr );
	if( ( controlfd=socket(AF_INET,SOCK_STREAM,0) ) ==-1 ){
		perror("socket()\n");
	}
	if( connect( controlfd , (struct sockaddr*)&remote , sizeof(remote) )== -1 ){
		perror("connect()\n");
	}
	status=CONNECTED;
	readline( controlfd , recbuf );
	printf("%s",recbuf);
	/////then enter the username//////////////
	printf("USER: ");
	getline(username);
	printf("%s\n",username);
	firstrc = ftpcmd("USER",username);
	switch(firstrc){
		case 1:
			printf("get a unexpected reply, open failed!\n");
			status=LOGINERROR;
			return;
		case 2:
			status=LOGINED;
			goto S;
		case 3:
			printf("PASSWORD: ");
			char *pass=malloc( sizeof(char)*20 );
			if(pass==NULL){
				perror("malloc failed!\n");
			}
			getline(pass);
			firstrc=ftpcmd("PASS",pass);
			printf("%d\n",firstrc);
			break;
		default:
			printf("get a bad reply, open failed!\n");
			status=LOGINERROR;
			return;
	}
	switch(firstrc){
		case 1:
			printf("get a unexpected reply, open failed!\n");
			status=LOGINERROR;
			return;
		case 2:
			status=LOGINED;
			goto S;
		case 3:
		//ACCT function need!
			printf("ACCOUNT: ");
			char *account=malloc( sizeof(char)*30 );
			if( account==NULL ){
				perror("malloc failed!\n");
			}
			getline(account);
			firstrc=ftpcmd("ACCT",account);
			break;
		default:
			printf("get a bad reply, open failed!\n");
			status=LOGINERROR;
			return;
	}
	switch(firstrc){
		case 1:
			printf("get a unexpected reply, open failed!\n");
			status=LOGINERROR;
			return;
		case 2:
			status=LOGINED;
			goto S;
		case 3:
			printf("get a unexpected reply, open failed!\n");
			status=LOGINERROR;
			return;
		default:
			printf("get a bad reply, open failed!\n");
			status=LOGINERROR;
			return;
	}
S:	firstrc=ftpcmd("SYST",NULL);
	ftpcmd("FEAT",NULL);//many things hasn't finished in this func!
	ftpcmd("PWD",NULL);
	firstrc=ftpcmd("TYPE","A");
	if( firstrc!=2 ){
		printf( "negotiation for the transmition failed!\n" );
		exit(0);
	}
}

void dolist(char *arg){
	int firstrc=ftpcmd("PASV",NULL);
	if( firstrc!=2 ){
		printf( "request for passive mode failed! list maybe wrong\n");
	}
	ftpcmd("LIST",arg);
}

void docd(char *arg){
	ftpcmd("CWD",arg);
}

void doget(char *arg){
	ftpcmd("TYPE","I");
	ftpcmd("PASV",NULL);
	printf("%s\n",arg);
	ftpcmd("RETR",arg);
}

void doput(char * arg){
	ftpcmd("TYPE","I");
	ftpcmd("PASV",NULL);
	printf("%s\n",arg);
	ftpcmd("STOR",arg);
}
	
void doerror(char *arg){
	printf("the user command you have inputted doesn't exit!\n");
}

///////////////////////////////////////////main paser////////////////////////////////////////////////
void parser(char *str){
	char *cmd=malloc( sizeof(char)*10 );
	char *arg=malloc( sizeof(char)*100 );
	if( cmd==NULL || arg==NULL ){
		perror("malloc failed!");
	}
	getcmdandarg( str , cmd , arg );
	printf( "cmd:%s,arg:%s\n" , cmd , arg );
	int num=cmdmappingnum(cmd);
	printf("num:%d\n",num);
	switch(num){
		case OPEN:
			doopen(arg);
			break;
		case quit:
			doquit(arg);
			break;
		case LS:
			dolist(arg);
			break;
		case CD:
			docd(arg);
			break;
		case GET:
			doget(arg);
			break;
		case PUT:
			doput(arg);
			break;
		default:
			doerror(arg);
	}
	printf("before free(cmd)\n");
	free(cmd);
	printf("after free(cmd)\n");
	free(arg);
	printf("after free(arg)\n");
}