Client Server Using a File that contains the credentials for clients to log-on.

Question

Client

Server

Using a File that contains the credentials for clients to log-on. Server should be able to listen to atleast 4 clients. Make modification to the source code to allow 5 attempt to log-on. File format contains (Passcode, User ID, Company Name, Department, Manager). With a successful log-on, they are greeted with "You have access " along with the users information. Code can be downloaded at box.com/dcc10e

Iinclude #include #include 4 include 6 void error (char *msg) perror(msg); exit (0) 10 11 int main (int argc, char rg) 12 I 13 int. sokd, port.no, ni 14 ruet ockaddr_in serv addr: 15 struct hostent *server; 16 har buffer[256 17 (argc

Explanation / Answer

//Server Program "Runnable Program" Accepts multiple Numbers Clients and validate client login on //server You should required Linux platform to run this program.

#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<fcntl.h>
#include<sys/socket.h>
#include<sys/un.h>
#include<sys/types.h>
//server program
//My program

#define BUFLEN 2048
#define PORT 7805
int Validate(char *buf)
{
FILE *fp=NULL;
fp=fopen("client_verify.txt","r");
if(fp==NULL)
   {printf("File Read Problem.");exit(0);}
char buffer[1024];
while(!feof(fp))
{
if(feof(fp))
   break;
fgets(buffer,1024,fp);
int flag=1,i=0;
for(;;)
{
   if(buffer[i]=='' && buf[i]=='')
    {return 1;}
   else if(buffer[i]=='' || buf[i]=='' || buffer[i]!=buf[i])
    {
           flag=0;fclose(fp);return 0;
    }
}//for loop end //each word and character end
}//while end
return 0;
}
int main()
{
   char buf[BUFLEN];
   int ser_sockfd,cli_sockfd;
   int ser_len,cli_len;
   int recv_len;
   struct sockaddr_in ser_address;
   struct sockaddr_in cli_address;
   cli_len=sizeof(cli_address);
   unlink("server_socket");

   ser_sockfd=socket(AF_INET,SOCK_DGRAM,0);
   if(ser_sockfd==-1)
   {
       printf("Socket not create");
   }
   //memset((char *)&ser_address,0,sizeof(ser_address));
   bzero(&ser_address,sizeof(ser_address));

   ser_address.sin_family=AF_INET;
   ser_address.sin_addr.s_addr=INADDR_ANY;
   ser_address.sin_port=htons(7805);
   //ser_len=sizeof(ser_address);
   //printf("Sizeod Ser_add-%d",ser_len);
  
   if((bind(ser_sockfd,(struct sockaddr *)&ser_address,sizeof(ser_address)))!=0)
       {
           printf("Bind Die");
           exit(0);
       }
   listen(ser_sockfd,55);
       printf(" Server Waiting ");
       fflush(stdout);  
   while(1)//Server allow to multiple clients log in request with given ip address "LOCAL"
   {
       if ((recv_len = recvfrom(ser_sockfd, buf, BUFLEN, 0, (struct sockaddr *) &cli_address, &cli_len)) == -1)
            {
                printf("recvfrom()");exit(1);
       }
       //Here will checking with passcode and all
       //Whose Sender Details
       printf("Received packet from %s:%d ", inet_ntoa(cli_address.sin_addr), ntohs(cli_address.sin_port));
       printf("FileNameRecv: %s " , buf);
       //Validation
       if(Validate(buf))
       {
           printf("You Are Success, %s ",buf);
       }
       else
           printf("Wrong Information ");
   }//while End
}

//SERVER PROGRAM END

//Client program Run on Linux same machine

#include<stdio.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<fcntl.h>
#include<stdlib.h>
#include<string.h>
//#include<sys/types.h>
//#include<sys/socket.h>
#include<unistd.h>
//#include<sys/un.h>

//IP- "+917387741823 Whats app.

int main()
{
   int sockfd;//Socket file discriptor
   int len;
   struct sockaddr_in cli_address,ser_address;
   int result;
   char buffer[2000];
       int broadcast=1;

   sockfd=socket(AF_INET,SOCK_DGRAM,0);
   if(sockfd==-1)
   {
       printf("client socket not create");
   }
  
   printf("Socket created ");

   bzero(&ser_address,sizeof(ser_address));
   ser_address.sin_family=AF_INET;
   ser_address.sin_addr.s_addr=INADDR_ANY;
   ser_address.sin_port=htons(7803);
  

//   sendto(sockfd,buffer,strlen(buffer),0,(struct sockaddr *)&ser_address,sizeof(struct sockaddr));
//   //file name send done
    //If u want to contact me then use IP ADDRESS INFORMATION No.
   char Buf[2048];
   int flag=0;
   while(1)
   {
       char passcode[100],userid[100],comp_name[100],dept[100],man[100];
           printf("Enter Passcode- ");
           scanf("%s",passcode);

           strcpy(Buf,passcode);
           strcat(Buf," ");

           printf("Enter User ID- ");
           scanf("%s",userid);

           strcat(Buf,userid);
           strcat(Buf," ");

           printf("Enter Company Name- ");
           scanf("%s",comp_name);

           strcat(Buf,comp_name);
           strcat(Buf," ");

           printf("Enter Department- ");
           scanf("%s",dept);

           strcat(Buf,dept);
           strcat(Buf," ");

           printf("Enter Manager- ");
           scanf("%s",man);

           strcat(Buf,man);
           strcat(Buf,"");
      
           sendto(sockfd,Buf,strlen(Buf),0,(struct sockaddr *)&ser_address,sizeof(struct sockaddr));
   }
   close(sockfd);
}

//Client program END

//IF You want to login from another machine that will also i provide code if u interested to get that code //with proper working code

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