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client.c
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client.c
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#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<netdb.h>
#include<string.h>
#include<stdio.h>
#include<signal.h>
#include<stdlib.h>
#include<unistd.h>
#include<ctype.h>
#include <math.h>
#define MAXLINE 100
void commandHandler(int); //client places request with this command
int sockfd; //client socket descriptor
void signalHandler(int sig)
{
char sendBuffer[MAXLINE];
sprintf(sendBuffer,"----||||----");
send(sockfd,sendBuffer,MAXLINE,0);
close(sockfd);
exit(0);
}
void commandHandler(int sockfd)
{
printf("Command Format: 1$domainname (or) 2$ipaddr\n" );
char sendBuffer[MAXLINE],recvBuffer[MAXLINE];
memset(sendBuffer,0,MAXLINE);
memset(recvBuffer,0,MAXLINE);
gets(sendBuffer);
send(sockfd,sendBuffer,MAXLINE,0);
recv(sockfd,recvBuffer,MAXLINE,0);
puts(recvBuffer);
signalHandler(1);
}
int main(int argc, char *argv[])
{
int check;
int SERVER_PORT = atoi(argv[2]);
struct sockaddr_in ServAddr;
//Creating the socket
sockfd=socket(AF_INET,SOCK_STREAM,0); //socket(internet_family,socket_type,protocol_value) retruns socket descriptor
if(sockfd<0)
{
perror("Cannot create socket!");
return 0;
}
//initializing the server socket
ServAddr.sin_family=AF_INET;
ServAddr.sin_addr.s_addr = inet_addr(argv[1]); //using the imput IP
ServAddr.sin_port = htons(SERVER_PORT); //self defined server port
if((connect(sockfd,(struct sockaddr *) &ServAddr,sizeof(ServAddr)))<0)
{
perror("Server is down!");
return 0;
}
signal(SIGINT,signalHandler);
//printf("\n Connection established :\n ");
{commandHandler(sockfd);}
return 0;
}