#include?
#include?
#include?
#include?
#include?“getmask.h“

#define?ICMP_MASK_REQ	17
#define?ICMP_MASK_REP	18
#define?ICMP_MASK_SIZE	12

int?nsend?=?0;

/*
?*?Function:	cal_cksum?
?*?Purpose:		calculate?checksum?of?icmp?header
?*?Parameters:	addr?-?start?address?of?icmp?header
?*				len?-?icmp?length
?*?Return:		calculated?checksum
?*/
uint16_t?cal_cksum（uint16_t?*addr?int?len）
{
	int?nleft?=?len;
	uint32_t?sum?=?0;
	uint16_t?*w?=?addr;
	uint16_t?answer?=?0;

	while?（nleft?>?1）?{
		sum?+=?*w++;
		nleft?-=?2;
	}

	if?（nleft?==?1）?{
		*（unsigned?char?*）（&answer）?=?*（unsigned?char?*）w?;
		sum?+=?answer;
	}

	sum?=?（sum?>>?16）?+?（sum?&?0xffff）;
	sum?+=?（sum?>>?16）;
	answer?=?~sum;
	return（answer）;
}

?屬性????????????大小?????日期????時(shí)間???名稱
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?????文件????????217??2010-04-18?13:37??icmpmask\makefile

?????文件???????2586??2010-04-18?13:05??icmpmask\getmask.c

?????文件???????1123??2010-03-22?14:42??icmpmask\getmask.h

?????文件???????1352??2010-04-18?13:38??icmpmask\icmpmask.c

?????目錄??????????0??2010-03-29?20:34??icmpmask

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?????????????????5278????????????????????5