/* What follows is code that ran before I added somecomments and should run
 * after....This is student code and I am posting it because my code is
 * somewhere in the disk cloud of my stuff.  I will more fully comment later.
*/

/*important note: run client on wilkes with ./client 39394 134.173.42.100 stringtopass, and run server on knuth sa ./server 39394*/
/*Thus one more parameter, and not exactly the CS125 Class Project */
/*Majority of socket code was adapted from code a group member wrote in summer research with Prof. Breeden, which also involved some socket tests*/


/* These are the libraries that numerous 'man' commands will show as necessary
 * for Sockets
*/


/*this is client*/

#include <stdio.h>
/*#include <csapp.h>  This is the stupid library from cs105 and shown in
class example */
#include <sys/socket.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>

/* main function */
int main (int argc, char *argv[]) {
    /* to me, add dnsaccess as a function, and pass in the input parameter */
	system("gcc -o dnsaccess dnsaccess.c"); //compile dnsaccess
	char namebuffer[1000]; //create buffer for running dnsaccess
	snprintf(namebuffer, sizeof(namebuffer), "./dnsaccess %s > file.txt", argv[2]); //print to namebuffer dnsaccess run command
        system(namebuffer); //run line in namebuffer
        char filebuffer[100]; 
        char* filename = "file.txt";
        FILE *file;  //create file pointer
        file = fopen(filename, "r");  //open file.txt
	/*read file to find IPv4 address */
        while(fgets(filebuffer, 100, file)){
                int dots = 0;
                int j = 0;
                for(j=0;j<100; j++){
                        if(filebuffer[j] == 46){
                                dots++;
                        }
                }
                if(dots == 3){
                        //printf("Found IPv4!\n");
                        //printf("%s\n", filebuffer);
                        break;
                }
        }       
        fclose(file); //close file
    /* need a place for the port id from the input string */    
	int port; //port number to send to
	port = atoi(argv[1]); //get port from input 

    /* The following code reflects the first slides of the Socket lecture
     * You need to get a socket and set it up with appropriate parameters
     * A Socket is a file descriptor describing how the interface is to work
     */
	int socketLoc = socket(AF_INET, SOCK_STREAM, 0); //initialize socket
	struct sockaddr_in address;    //Socket address
	address.sin_family = AF_INET;  //Using IPv4
	address.sin_port = htons(port); //link port to socket address
	address.sin_addr.s_addr = inet_addr(filebuffer);//argv[2]); //getting IP address from input

    /* got the Socket set up.  Now try to connect.  This code reflects code in
     * the Client Example Code of the Socket Lecture
     */
	int err = connect(socketLoc, (struct sockaddr*)&address, sizeof(address)); //Establish connection
	if(err < 0){
                printf("Error with connect\n");
                exit(EXIT_FAILURE);
        }
    /* The conection is up, So now send a message
     */
	err = send(socketLoc, argv[3], strlen(argv[3]), 0);  //send message
	if(err < 0){
                printf("Error with send\n");
                exit(EXIT_FAILURE);
        }
	printf("client: sent %lu bytes, \"%s\"\n", strlen(argv[3]), argv[3]);  //print bytes sent
    /* The print about just says how many bytes were sent */

    /* Now get ready to receive the return message from the server */
	char buffer[10000000] = {0};  /*initialize buffer - Mike cannot hold key
    this long */
	err = recv(socketLoc, buffer, 10000000, 0);  //receive message from socket
	if(err < 0){
                printf("Error with recv\n");
                exit(EXIT_FAILURE);
        }

	/*find actual number of characters read */
	long unsigned int i;
        for(i=0;i<10000000;i++){
                if(buffer[i] == 0){
                        break;
                }
        }

	/* print bytes received*/
	printf("client: received %lu bytes, \"%s\"\n", i, buffer);
	exit(0);

}
/*important note: run client on wilkes with ./client 39394 134.173.42.100 stringtopass, and run server on knuth sa ./server 39394*/
/*Majority of socket code was adapted from code a group member wrote in summer research with Prof. Breeden, which also involved some socket tests*/