/**********************************************************
Date:?		NOV?28th?2006
Project?:	TFTP?Client
Programers:	
Jonathan?Felske
Andrew?Fullard?
Craig?Holmes
Reza?Rahmanian?
Adam?Tomalty?
File:		TFTP?Client?（main）
Purpose:	A?TFTP?client?that?will?request?a?connections?from
		the?server?and?transefet?files.
Notes:		Here?we?are?using?the?sendto?and?recvfrom
		functions?so?the?server?and?client?can?exchange?data.
***********************************************************/

#include?“tftp.h“

/*a?function?to?print?the?Help?menu*/
void?help?（char?*）;
/*a?function?to?create?the?request?packet?read?or?write*/
int?req_packet?（int?opcode?char?*filename?char?*mode?char?buf[]）;
/*a?function?to?creat?an?ACK?packet*/
int?ack_packet?（int?block?char?buf[]）;
/*a?function?to?create?the?Error?packets*/
int?err_packet?（int?err_code?char?*err_msg?char?buf[]）;
/*a?function?that?will?print?the?ip:port?pair?of?the?server?or?client?plus?data?sent?or?recieved*/
void?ip_port?（struct?sockaddr_in?host）;
/*a?function?to?send?a?file?to?the?server*/
void?tsend?（char?*pFilename?struct?sockaddr_in?server?char?*pMode
	????int?sock）;
/*a?function?to?get?a?file?from?the?server*/
void?tget?（char?*pFilename?struct?sockaddr_in?server?char?*pMode?int?sock）;


/*?default?values?which?can?be?controlled?by?command?line?*/
char?path[64]?=?“/tmp/“;
int?port?=?69;
unsigned?short?int?ackfreq?=?1;
int?datasize?=?512;
int?debug?=?0?w_size?=?1?p_length?=?512;


int
main?（int?argc?char?**argv）
{
??/*local?variables?*/
??extern?char?*optarg;
??int?sock?server_len?len?opt;	//n;
??char?opcode?filename[196]?mode[12]?=?“octet“;
??struct?hostent?*host;		/*for?host?information?*/
??struct?sockaddr_in?server;	//?client;?/*the?address?structure?for?both?the?server?and?client?*/
??FILE?*fp;			/*a?pointer?to?a?file?that?the?client?will?send?or?get?from?the?server?*/

??if?（argc?????{
??????help?（argv[0]）;
??????return?0;
????}
??if?（!（host?=?gethostbyname?（argv[1]）））
????{
??????perror?（“Client?could?not?get?host?address?information“）;
??????exit?（2）;
????}

/*?All?of?the?following?deals?with?command?line?switches?*/
??while?（（opt?=?getopt?（argc?argv?“dnoh:P:p:g:l:w:“））?!=?-1）	/*?this?function?is?handy?*/
????{
??????switch?（opt）
	{
	case?‘d‘:		/*?debug?mode?（no?opts）?*/
	??debug?=?1;
	??break;
	case?‘P‘:		/*?Port?（opt?required）?*/
	??port?=?atoi?（optarg）;
	??if?（debug）
	????{
	??????printf?（“Client:?The?port?number?is:?%d\n“?port）;
	????}
	??break;
	case?‘p‘:		/*?put?a?file?on?the?server?*/
	??strncpy?（filename?optarg?sizeof?（filename）?-?1）;
	??opcode?=?WRQ;
	??fp?=?fopen?（filename?“r“）;	/*opened?the?file?for?reading?*/
	??if?（fp?==?NULL）
	????{
	??????printf?（“Client:?file?could?not?be?opened\n“）;
	??????return?0;
	????}
	??if?（debug）
	????{
	??????printf?（“Client:?The?file?name?is:?%s?and?can?be?read“
		??????filename）;
	????}
	??fclose?（fp）;
	??break;
	case?‘g‘:		/*get?a?file?from?the?server?*/
	??strncpy?（filename?optarg?sizeof?（filename）?-?1）;
	??opcode?=?RR