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online_banking_client.c
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online_banking_client.c
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#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ipc.h>
#include <sys/wait.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/msg.h>
#include <sys/sem.h>
#include <sys/shm.h>
#include <time.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define SEND_USERBUFFER_SIZE 1024
#define RECV_USERBUFFER_SIZE 1024
// #include <netinet/ip.h>
//SIGINT handler.
void signal_handler()
{
printf("\n\nClient Shut Down.\n");
exit(1);
}
void send_to_server(int sockfd, char *message)
{
int size_header = (strlen(message) - 1) / SEND_USERBUFFER_SIZE + 1;
int send_status = write(sockfd, &size_header, sizeof(int));
char *send_message = (char *)malloc(size_header * SEND_USERBUFFER_SIZE);
strcpy(send_message, message);
for (int i = 0; i < size_header; i++)
{
int send_status = write(sockfd, send_message, SEND_USERBUFFER_SIZE);
send_message += SEND_USERBUFFER_SIZE;
}
}
char* receive_from_server(int sockfd)
{
int size_header = 0;
// printf("%d\n", sockfd);
int receive_status = read(sockfd, &size_header, sizeof(int));
// printf("%d\n", receive_status);
if (receive_status <= 0)
{
shutdown(sockfd, SHUT_WR);
return NULL;
}
char *message = (char *)malloc(size_header * RECV_USERBUFFER_SIZE);
memset(message, 0, size_header * RECV_USERBUFFER_SIZE);
char *receive_message = message;
for (int i = 0; i < size_header; i++)
{
int receive_status = read(sockfd, message, RECV_USERBUFFER_SIZE);
message += RECV_USERBUFFER_SIZE;
}
return receive_message;
}
int main(int argc, char **argv)
{
if (signal(SIGINT, signal_handler) == SIG_ERR)
{
printf("Error in catching SIGINT\n");
}
while(1) {
if (argc < 2)
{
printf("Insufficient Number of arguments\nPlease enter a port number!\n");
exit(0);
}
int port_number = atoi(argv[1]);
printf("CLIENT...\n");
int sockfd = socket(AF_INET, SOCK_STREAM,0);
if(sockfd == -1)
{
perror("Socket Error\n");
exit(0);
}
struct sockaddr_in sock_name;
sock_name.sin_family = AF_INET;
sock_name.sin_port = htons(port_number);
sock_name.sin_addr.s_addr = inet_addr("127.0.0.1");
int c = connect(sockfd, (struct sockaddr*)(&sock_name), sizeof(sock_name));
if(c == -1)
{
perror("Connect Error\n");
exit(0);
}
char *server_response;
char message[140];
while(1)
{
server_response = receive_from_server(sockfd);
if(server_response == NULL)
{
printf("You have been disconnected from the server.\n");
break;
}
printf("%s\n", server_response);
free(server_response);
memset(message,0,sizeof(message));
// printf("WTF\n");
printf("Enter response to server: \n");
scanf(" %[^\n]", message);
// printf("%s\n", message);
send_to_server(sockfd, message);
}
exit(1);
}
return 0;
}