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client.c
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#include <errno.h>
#include <stdio.h>
#include <fcntl.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
int check(char* read_buffer) // checks whether the read_buffer contains 0 or not (if it does not contain 0, that means server is indicating an error)
{
if((int)read_buffer[0] == 49 && (int)read_buffer[1] == 0)
{
return -1;
}
return 0;
}
int main()
{
write(1, "This is the client program!\n", strlen("This is the client program!\n"));
int sd = socket(AF_INET, SOCK_STREAM, 0); // RAW Socket Descriptor
if(sd == -1)
{
write(2, "Error: Failed To Initialize a Socket!\n", strlen("Error: Failed To Initialize a Socket!\n"));
exit(1);
}
struct in_addr inadr;
struct sockaddr_in serv, cli;
serv.sin_family = AF_INET;
inadr.s_addr = INADDR_ANY;
serv.sin_addr = (inadr);
serv.sin_port = htons(6000); // setting the port no. as 5000
printf("The port is: %d\n", serv.sin_port);
int val = connect(sd, (void*)&serv, sizeof(serv));
if(val == -1) // connection failed
{
write(2, "Erro: Failed To Connect!\n", strlen("Erro: Failed To Connect!\n"));
exit(1);
}
write(1, "Client is connected to the server...\n", strlen("Client is connected to the server...\n"));
int i = 0;
int id = 0;
while(1)
{
char write_buffer[1024] = {0};
char read_buffer[1024] = {0};
if(i != 3) recv(sd, read_buffer, sizeof(read_buffer), 0); // we are still in the phase of logging in
if(i == 0) // iteration 1 - login
{
write(1, read_buffer, sizeof(read_buffer));
read(0, write_buffer, sizeof(write_buffer));
send(sd, write_buffer, sizeof(write_buffer), MSG_CONFIRM);
id = atoi(write_buffer);
i = i + 1;
}
else if(i == 1) // output having sent the login id
{
if(strcmp(read_buffer, "1") == 0)
{
write(1, "Incorrect Id!\n", strlen("Incorrect Id!\n"));
write(1, "Closing the connection...\n", strlen("Closing the connection...\n"));
exit(1);
}
else if(strcmp(read_buffer, "2") == 0)
{
write(1, "Account Already Open!\n", strlen("Account Already Open!\n"));
write(1, "Closing the connection...\n", strlen("Closing the connection...\n"));
exit(1);
}
else // ID has been accepted
{
write(1, read_buffer, sizeof(read_buffer));
read(0, write_buffer, sizeof(write_buffer));
send(sd, write_buffer, sizeof(write_buffer), MSG_CONFIRM);
i = i + 1;
}
}
else if(i == 2) // output having sent the password
{
if(strcmp(read_buffer, "1") == 0)
{
write(1, "Incorrect Password!\n", strlen("Incorrect Password!\n"));
write(1, "Closing the connection...\n", strlen("Closing the connection...\n"));
exit(1);
}
else if(strcmp(read_buffer, "2") == 0)
{
write(1, "Account Already Open!\n", strlen("Account Already Open!\n"));
write(1, "Closing the connection...\n", strlen("Closing the connection...\n"));
exit(1);
}
else // password has been accepted
{
write(1, read_buffer, sizeof(read_buffer));
i = i + 1;
}
}
else // main loop (login process was successful)
{
if(id != 1) // this is the user account
{
while(1)
{
memset(read_buffer, 0, sizeof(read_buffer));
memset(write_buffer, 0, sizeof(write_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
if(check(read_buffer) == -1)
{
write(1, "Invalid Input, Try Again!\n", strlen("Invalid Input, Try Again!\n"));
continue;
}
write(1, read_buffer, sizeof(read_buffer));
read(0, write_buffer, sizeof(write_buffer));
send(sd, write_buffer, sizeof(write_buffer), MSG_CONFIRM);
if((int)write_buffer[0] == 54 && (int)write_buffer[1] == 10) // the user wants to logout
{
printf("Closing the connection...\n");
exit(1);
}
else if((int)write_buffer[0] == 51 && (int)write_buffer[1] == 10) // the user wants to know their balance
{
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
if(check(read_buffer) == -1)
{
write(1, "Invalid Input, Try Again!\n", strlen("Invalid Input, Try Again!\n"));
continue;
}
write(1, "Your balance is: ", strlen("Your balance is: "));
write(1, read_buffer, sizeof(read_buffer));
write(1, "\n", strlen("\n"));
}
else if((int)write_buffer[0] == 53 && (int)write_buffer[1] == 10) // the user wants to know their account details
{
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
if(check(read_buffer) == -1)
{
write(1, "Invalid Input, Try Again!\n", strlen("Invalid Input, Try Again!\n"));
continue;
}
write(1, "++++++++++++++\n", strlen("++++++++++++++\n"));
write(1, "Your Id is: ", strlen("Your Id is: "));
write(1, read_buffer, sizeof(read_buffer));
write(1, "\n", strlen("\n"));
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
write(1, read_buffer, sizeof(read_buffer));
write(1, "\n", strlen("\n"));
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
write(1, "Your Password is: ", strlen("Your Password is: "));
write(1, read_buffer, sizeof(read_buffer));
write(1, "\n", strlen("\n"));
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
write(1, "Your Balance is: ", strlen("Your Balance is: "));
write(1, read_buffer, sizeof(read_buffer));
write(1, "\n", strlen("\n"));
write(1, "++++++++++++++\n", strlen("++++++++++++++\n"));
}
else if((int)write_buffer[0] == 49 && (int)write_buffer[1] == 10) // the user wants to deposit into their account
{
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
if(check(read_buffer) == -1)
{
write(1, "Invalid Input, Try Again!\n", strlen("Invalid Input, Try Again!\n"));
continue;
}
write(1, read_buffer, sizeof(read_buffer));
memset(write_buffer, 0, sizeof(write_buffer));
read(0, write_buffer, sizeof(write_buffer));
send(sd, write_buffer, sizeof(write_buffer), MSG_CONFIRM);
}
else if((int)write_buffer[0] == 50 && (int)write_buffer[1] == 10) // the user wants to withdraw from their account
{
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
if(check(read_buffer) == -1)
{
write(1, "Invalid Input, Try Again!\n", strlen("Invalid Input, Try Again!\n"));
continue;
}
write(1, read_buffer, sizeof(read_buffer));
memset(write_buffer, 0, sizeof(write_buffer));
read(0, write_buffer, sizeof(write_buffer));
send(sd, write_buffer, sizeof(write_buffer), MSG_CONFIRM);
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
if(check(read_buffer) == -1) write(1, "Insufficient Balance\n", strlen("Insufficient Balance\n"));
}
else if((int)write_buffer[0] == 52 && (int)write_buffer[1] == 10) // the user wants to change their password
{
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
if(check(read_buffer) == -1)
{
write(1, "Invalid Input, Try Again!\n", strlen("Invalid Input, Try Again!\n"));
continue;
}
write(1, read_buffer, sizeof(read_buffer));
memset(write_buffer, 0, sizeof(write_buffer));
read(0, write_buffer, sizeof(write_buffer));
send(sd, write_buffer, sizeof(write_buffer), MSG_CONFIRM);
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
if(check(read_buffer) == -1) write(1, "Failed To Change Password\n", strlen("Failed To Change Password\n"));
}
}
}
else // this is the admin's account
{
while(1)
{
memset(read_buffer, 0, sizeof(read_buffer));
memset(write_buffer, 0, sizeof(write_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
if(check(read_buffer) == -1)
{
write(1, "Invalid Input, Try Again!\n", strlen("Invalid Input, Try Again!\n"));
continue;
}
write(1, read_buffer, sizeof(read_buffer));
read(0, write_buffer, sizeof(write_buffer));
send(sd, write_buffer, sizeof(write_buffer), MSG_CONFIRM);
if(((int)write_buffer[0] == 53) && (int)write_buffer[1] == 10) // the admin wants to logout
{
printf("Closing the connection...\n");
exit(1);
}
else if((int)write_buffer[0] == 54 && (int)write_buffer[1] == 10) // the admin wants to close the server
{
send(sd, write_buffer, sizeof(write_buffer), MSG_CONFIRM);
printf("Closing the connection...\n");
exit(1);
}
else if((int)write_buffer[0] == 51 && (int)write_buffer[1] == 10)
{
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
if(check(read_buffer) == -1)
{
write(1, "Invalid Input, Try Again!\n", strlen("Invalid Input, Try Again!\n"));
continue;
}
write(1, read_buffer, sizeof(read_buffer));
memset(write_buffer, 0, sizeof(write_buffer));
read(0, write_buffer, sizeof(write_buffer));
int aux_id = atoi(write_buffer);
send(sd, write_buffer, sizeof(write_buffer), MSG_CONFIRM);
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
if(check(read_buffer) == -1)
{
write(1, "Account ID Invalid!\n", strlen("Account ID Invalid!\n"));
continue;
}
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
write(1, "++++++++++++++\n", strlen("++++++++++++++\n"));
write(1, "Account Id is: ", strlen("Account Id is: "));
write(1, read_buffer, sizeof(read_buffer));
write(1, "\n", strlen("\n"));
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
write(1, read_buffer, sizeof(read_buffer));
write(1, "\n", strlen("\n"));
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
write(1, "Account Password is: ", strlen("Account Password is: "));
write(1, read_buffer, sizeof(read_buffer));
write(1, "\n", strlen("\n"));
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
if(aux_id != 1)
{
write(1, "Account Balance is: ", strlen("Account Balance is: "));
}
else
{
write(1, "Number of account data-structures in the database are: ", strlen("Number of account data-structures in the database are: "));
}
write(1, read_buffer, sizeof(read_buffer));
write(1, "\n", strlen("\n"));
write(1, "++++++++++++++\n", strlen("++++++++++++++\n"));
}
else if((int)write_buffer[0] == 50 && (int)write_buffer[1] == 10) // admin wants to delete an account
{
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
if(check(read_buffer) == -1)
{
write(1, "Invalid Input, Try Again!\n", strlen("Invalid Input, Try Again!\n"));
continue;
}
write(1, read_buffer, sizeof(read_buffer));
memset(write_buffer, 0, sizeof(write_buffer));
read(0, write_buffer, sizeof(write_buffer));
send(sd, write_buffer, sizeof(write_buffer), MSG_CONFIRM);
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
if(check(read_buffer) == -1)
{
write(1, "Account ID Invalid!\n", strlen("Account ID Invalid!\n"));
continue;
}
else
{
write(1, "Account Deleted!\n", strlen("Account Deleted!\n"));
continue;
}
}
else if((int)write_buffer[0] == 52 && (int)write_buffer[1] == 10) // admin wants to modify the account password
{
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
if(check(read_buffer) == -1)
{
write(1, "Invalid Input, Try Again!\n", strlen("Invalid Input, Try Again!\n"));
continue;
}
write(1, read_buffer, sizeof(read_buffer));
memset(write_buffer, 0, sizeof(write_buffer));
read(0, write_buffer, sizeof(write_buffer));
send(sd, write_buffer, sizeof(write_buffer), MSG_CONFIRM);
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
if(check(read_buffer) == -1)
{
write(1, "Account ID Invalid!\n", strlen("Account ID Invalid!\n"));
continue;
}
write(1, read_buffer, sizeof(read_buffer));
memset(write_buffer, 0, sizeof(write_buffer));
read(0, write_buffer, sizeof(write_buffer));
send(sd, write_buffer, sizeof(write_buffer), MSG_CONFIRM);
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
if(check(read_buffer) == -1)
{
write(1, "Failed to change password!\n", strlen("Failed to change password!\n"));
continue;
}
}
else if((int)write_buffer[0] == 49 && (int)write_buffer[1] == 10) // admin wants to add an account
{
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
write(1, read_buffer, sizeof(read_buffer));
memset(write_buffer, 0, sizeof(write_buffer));
read(0, write_buffer, sizeof(write_buffer));
send(sd, write_buffer, sizeof(write_buffer), MSG_CONFIRM);
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
if(read_buffer[0] == (int)'-')
{
write(1, "Invalid Number Of Accounts!\n", strlen("Invalid Number Of Accounts!\n"));
continue;
}
int num_of_accounts = atoi(read_buffer);
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
write(1, read_buffer, sizeof(read_buffer));
int tag = 0;
for(int i = 0; i < num_of_accounts; i++)
{
memset(read_buffer, 0, sizeof(read_buffer));
memset(write_buffer, 0, sizeof(write_buffer));
read(0, write_buffer, sizeof(write_buffer));
send(sd, write_buffer, sizeof(write_buffer), MSG_CONFIRM);
recv(sd, read_buffer, sizeof(read_buffer), 0);
if(check(read_buffer) == -1)
{
write(1, "Invalid Account Id\n", strlen("Invalid Account Id\n"));
tag = 1;
break;
}
}
if(tag == 1)
continue;
memset(read_buffer, 0, sizeof(read_buffer));
recv(sd, read_buffer, sizeof(read_buffer), 0);
if(atoi(read_buffer) == 1)
{
write(1, "Invalid Account Id\n", strlen("Invalid Account Id\n"));
continue;
}
write(1, read_buffer, sizeof(read_buffer));
memset(write_buffer, 0, sizeof(write_buffer));
read(0, write_buffer, sizeof(write_buffer));
send(sd, write_buffer, sizeof(write_buffer), MSG_CONFIRM);
}
}
}
}
}
return 0;
}