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client.c
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client.c
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#include "header.h"
void error(char *msg)
{
perror(msg);
exit(0);
}
int main(int argc, char *argv[])
{
int sockfd, portno, n;
struct sockaddr_in serv_addr;
struct hostent *server;
char buffer[256];
//We have to use 3 args while running client code.
if (argc < 3)
{
fprintf(stderr,"usage %s hostname port\n", argv[0]);
exit(0);
}
//Gets the portno form the argument
portno = atoi(argv[2]);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if(sockfd<0)
{
error("Error opening socket");
}
// if (sockfd h_addr,(char *)&serv_addr.sin_addr.s_addr,server->h_length);
//gets the hostname
server = gethostbyname(argv[1]);
if(server==NULL)
{
fprintf(stderr,"Error,no such host\n");
exit(0);
}
bzero((char *) &serv_addr, sizeof(serv_addr));
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);
if (connect(sockfd,&serv_addr,sizeof(serv_addr)) < 0)
{
error("ERROR connecting");
}
printf("Please enter the linux command: ");
bzero(buffer,256); //clears the buffer content
fgets(buffer,255,stdin);
//For iterating the execution of the code loope needs to be here.
n = write(sockfd,buffer,strlen(buffer)); //returns -1 if the write on the buffer was sucessful.
if (n < 0)
{
error("ERROR writing to socket");
}
bzero(buffer,256);
n = read(sockfd,buffer,255);
if (n < 0)
{
error("ERROR reading from socket");
}
printf("\n%s\n",buffer);
return 0;
}