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client.cpp
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client.cpp
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//essential headers
#include <stdio.h>
#include<iostream>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include<sys/wait.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include<fcntl.h>
using namespace std;
void nexit()
{//normal exit
exit(0);
}
int main(int argc, char *argv[])
{
struct hostent *server;
struct sockaddr_in serv_addr;
int sockfd, portno, n;
//checking if enough input is notentered as command for client
if (argc < 3)
{
fprintf(stderr,"usage %s hostname port\n", argv[0]);
nexit();
}
//converting arg2 from string to integer
portno = atoi(argv[2]);
//creating an endpoint for communication
sockfd = socket(AF_INET, SOCK_STREAM, 0);
//negative value returned means error as sockets are always positive
if (sockfd < 0)
{
perror("Error!! While opening socket");
nexit();
}
server = gethostbyname(argv[1]);
if (server == NULL)
{
fprintf(stderr,"ERROR, no such host\n");
nexit();
}
bzero((char *) &serv_addr, sizeof(serv_addr));
//setting address family as ipv4
serv_addr.sin_family = AF_INET;
bcopy((char *)server->h_addr,(char *)&serv_addr.sin_addr.s_addr,server->h_length);
serv_addr.sin_port = htons(portno);
//initiating a connection on a socket
if (connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0)
{
perror("Error!! While connecting");
nexit();
}
//display screen
cout<<"\e[1;1H\e[2J";
cout<<"-----------------------------Welcome to Client Window-----------------------------";
cout<<endl;
cout<<"Enter either of the following commands:"<<endl;
cout<<"1.ls 2.cd 3.chmod 4.lls 5.lcd 6.lchmod 7.put 8.get 9.close"<<endl;
//creating buffer for saving entered input
char buffer[8192];
bzero(buffer,8192);
//until client runs endlessly untilclose command is entered
while(1)
{
cout<<endl<<">> ";
fgets(buffer,255,stdin);
int i=0,argc=0,k=0;
char** parameter = new char * [20];
char var[256];
int a;
while(i<strlen(buffer))
{//breaking input string into different parameters
a=(int)buffer[i];
//checking ascii for space and newline
if(a==32 || a==10)
{
parameter[argc] = new char [20];
strcpy(parameter[argc], var);
bzero(var,256);
k=0;
argc++;
}
else
{
var[k]=buffer[i];
k++;
}
i++;
}
//put command for uploading file to server
if(!strncmp("put",parameter[0],3))
{
int fd1,n1;
write(sockfd,buffer,strlen(buffer));
//opening a file from clientwhich we wish to send
fd1=open(parameter[1],O_RDONLY);
if(fd1 == -1)
perror("error with the input file");
while(1)
{
bzero(buffer,8192);
//reading from file descriptor to buffer
n=read(fd1, buffer, 8192);
//writing from buffer to socket for server
if(write(sockfd, buffer, n)!=n)
{
perror("problem in writing to buffer");
break;
}
if(n==-1)
{
perror("problem in reading from file");
break;
}
else if(n<8192)
{
cout<<"put executed successfully";
break;
}
}
close(fd1);
}
//get command for downloading file from server
else if(!strncmp("get",parameter[0],3))
{
int fd2,bytescount,n1;
//sending complete input command strings to server
write(sockfd,buffer,strlen(buffer));
//creataing new file
fd2=open(parameter[1], O_CREAT | O_WRONLY | O_EXCL , 0700);
//cout<<"after fd2"<<endl;
while(1)
{
bzero(buffer,8192);
bytescount = read(sockfd, buffer, sizeof(buffer));
n1=write(fd2, buffer,bytescount);
if(bytescount==-1)
perror("problem in reading from server socket");
else if(bytescount<8192)
{
cout<<"File received successfully";
break;
}
}
}
//listing of files on client
else if(!strcmp("lls" , parameter[0]))
{
pid_t pid =fork();
if (pid < 0)
{
perror("Error!! fork failed");
nexit();
}
else if(pid==0)
{
execlp("/bin/ls","ls",NULL);
}
else
wait(NULL);
}
//changing directory of client
else if(!strncmp("lcd" , parameter[0], 3))
{
char* path = new char[1000];
int k = chdir(parameter[1]);
if (k!=0)
cout<<"Error!! while changing the directory"<<endl;
else
{
path = getcwd(path,1000);
cout<<"Current working dir: "<<path<<"\n";
}
}
//changing access of files of client
else if(!strncmp("lchmod" , parameter[0], 6))
{
if(fork()==0)
{
int e=0;
for(i=1;i<argc;i++)
{
argv[i]=parameter[i];
}
argv[i]=NULL;
argv[0]=(char*)"/bin/chmod";
e=execvp(argv[0],argv);
if(e==-1)
{
cout<<"Error!! while changing mod"<<endl;
nexit();
}
}
else wait(NULL);
}
//closing the client socket
else if(!strncmp("close",parameter[0],5))
break;
//server side commands sent from here
else
{
n = write(sockfd,buffer,strlen(buffer));
//cout<<n<<endl;
if (n < 0)
{
perror("Error!! While writing to socket");nexit();
}
bzero(buffer,8192);
n = read(sockfd,buffer,8191);
if (n < 0)
{
perror("Error!! While reading from socket");nexit();
}
printf("%s\n",buffer);
bzero(buffer,8192);
}
}
close(sockfd);
return 0;
}