#include?//
#include?//
#include?//
#include?//
#include?
#include?//
#include?
#include?
#include?
#include?
#include?//
#include?//
#include?

int?main（int?argc?char?const?*argv[]）
{
	int?socketfd?=?0;
	int?fd?=?0;
	socklen_t?addr_len?=?0;
	socklen_t?len?=?0;?
	unsigned?short?server_port?=?69;
	struct?sockaddr_in?s_addr;
	//struct?sockaddr_in?c_addr;
	char?sendbuf[516];
	char?recvbuf[516];
	char?ack[5];
	char?*filename?=?argv[3];
	if?（（socketfd?=?socket（AF_INETSOCK_DGRAM0））?	{
		perror（“socket“）;
		exit（EXIT_FAILURE）;
	}
	else
	{
		printf（“creat?socket.\n“）;
	}
	memset（&s_addr0?sizeof（struct?sockaddr_in））;
	s_addr.sin_family?=?AF_INET;
	s_addr.sin_port?=?htons（server_port）;
	//s_addr.sin_addr.s_addr?=?INADDR_ANY;//ip
	
	/*if?（（bind（socketfd（struct?sockaddr?*）?&s_addr?sizeof（s_addr）））==-1）
	{
		perror（“bind“）;
		exit（EXIT_FAILURE）;
	}
	printf（“bind?to?socket\n“）;
	addr_len?=?sizeof（c_addr）;
	*/
	if?（inet_aton?（argv[1]&s_addr.sin_addr）?==?0）
	{
		perror（“argv[1]“）;
		exit（EXIT_FAILURE）;
	}
	memset（sendbuf0?sizeof（sendbuf））;
	if?（strcmp?（argv[2]“get“）?==?0）//發(fā)送讀請(qǐng)求
	{
		len?=?sprintf?（sendbuf?“%c%c%s%cnetascii%c“?0?1?filename?0?0）;//操作碼01/文件名/0/netascii/0
		if?（（sendto（socketfd?sendbuf?len?0?（struct?sockaddr?*）?&s_addrsizeof?（s_addr）））?		{
			printf?（“send?error\n“）;
			exit?（EXIT_FAILURE）;
		}
		printf（“send\n“?）;
		memset（recvbuf0?sizeof（recvbuf））;
		addr_len?=?sizeof?（s_addr）;
		umask（0000）;
		while（1）
		{
			len?=recvfrom?（socketfd?recvbuf?516?0（struct?sockaddr?*）?&s_addr?&addr_len）;//接收數(shù)據(jù)?數(shù)據(jù)緩沖/數(shù)據(jù)緩沖區(qū)長(zhǎng)度/0/目的網(wǎng)絡(luò)地址/地址長(zhǎng)度
		
			if?（len?	????	{
	??????		perror?（“recvfrom“）;//
	??????		break;
	????	}
	????	if?（fd?==?0）
	????	{
	????		if?（（fd?=?open（filename?O_RDWR|O_CREAT?0777））<0）
	????		{
	????			perror（“open“）;
	????			break;
	????		}
	????	}
	????	write（fdrecvbuf+4len-4）;
	????	if?（len?	????	{
	????		printf（“read?success\n“）;
	????		sendto（socketfdack40（struct?sockaddr*）?&s_addr?sizeof（s_addr））;
	????		break;
	????	}
	????	bzero?（ack?sizeof?（ack））;
	????	memcpy（ackrecvbuf4）;
	????	ack[1]++;
		??	if?（（sendto?（socketfd?ack?4?0?（struct?sockaddr?*）?&s_addrsizeof?（s_addr）））?	????	{
	??????		perror?（“sendto“）;
	??????		break;
	????	}
	????	bzero?（recvbuf?sizeof?（recvbuf））;
		}
	????close（socketfd）;
	????close（fd）;		

	}
	else?if?（strcmp?（argv[2]“put“）?==?0）
	{
		addr_len?=?sizeof（struct?sockaddr_in）;
		sprintf?（sendbuf?“%c%c%s%cnetascii%c“?0?2?filename?0?0）;
		sendto（socketfd?sendbuf?12+strlen（filename）?0?（struct?sockaddr*）&s_addrsizeof（s_addr））;
		char?block_num?=?0;
		while（1）
		{
			memset（recvbuf0sizeof（recvbuf））;
			memset（&s_addr‘\0‘sizeof（struct?sockaddr_in））;
			recvfrom（socketfdrecvbuf5160（struct?sockaddr?*）?&s_addr&addr_len）;//傳送
			if?（fd?==?0）
			{
				if?（（fd?=?open（filenam

?屬性????????????大小?????日期????時(shí)間???名稱(chēng)
-----------?---------??----------?-----??----
?????文件????????3745??2013-07-08?04:40??file_client.c