/*
?*?Issue?an?ICMP?address?mask?request?and?print?the?reply.
?*
?*?This?program?originated?from?the?public?domain?ping?program?written
?*?by?Mike?Muuss.
?*
?*?You?must?be?superuser?to?run?this?program?（or?it?must?be?suid?to?root）
?*?since?it?requires?a?raw?socket.
?*/

#include?
#include?
#include?
#include?
#include?
#include?

#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?

#define	DEFDATALEN	（12）	/*?default?data?length?*/
#define	MAXIPLEN	60
#define	MAXICMPLEN	76
#define	MAXPACKET	（65536?-?60?-?8）/*?max?packet?size?*/

struct?sockaddr	whereto;	/*?who?to?send?request?to?*/
int		datalen?=?DEFDATALEN;
int		s;
u_char		outpack[MAXPACKET];
char		*hostname;
u_long		inet_addr（）;
char		*inet_ntoa（）;
void		sig_alrm（int）;
int		response?=?0;

main（argc?argv）
int	argc;
char	**argv;
{
	int			i?ch?fdmask?hold?packlen?preload;
	extern?int		errno;
	struct?hostent		*hp;
	struct?sockaddr_in	*to;
	struct?protoent		*proto;
	u_char			*packet;
	char			*target?hnamebuf[MAXHOSTNAMELEN]?*malloc（）;

	if?（argc?!=?2）
		exit（1）;

	target?=?argv[1];

	bzero（（char?*）&whereto?sizeof（struct?sockaddr））;
	to?=?（struct?sockaddr_in?*）&whereto;
	to->sin_family?=?AF_INET;

		/*?try?to?convert?as?dotted?decimal?address
		???else?if?that?fails?assume?it‘s?a?hostname?*/
	to->sin_addr.s_addr?=?inet_addr（target）;
	if?（to->sin_addr.s_addr?!=?（u_int）-1）
		hostname?=?target;
	else?{
		hp?=?gethostbyname（target）;
		if?（!hp）?{
			fprintf（stderr?“unknown?host?%s\n“?target）;
			exit（1）;
		}
		to->sin_family?=?hp->h_addrtype;
		bcopy（hp->h_addr?（caddr_t）&to->sin_addr?hp->h_length）;
		strncpy（hnamebuf?hp->h_name?sizeof（hnamebuf）?-?1）;
		hostname?=?hnamebuf;
	}

	packlen?=?datalen?+?MAXIPLEN?+?MAXICMPLEN;
	if?（?（packet?=?（u_char?*）malloc（（u_int）packlen））?==?NULL）?{
		fprintf（stderr?“malloc?error\n“）;
		exit（1）;
	}

	if?（?（proto?=?getprotobyname（“icmp“））?==?NULL）?{
		fprintf（stderr?“unknown?protocol?icmp\n“）;
		exit（1）;
	}

	if?（?（s?=?socket（AF_INET?SOCK_RAW?proto->p_proto））?		perror（“socket“）;	/*?probably?not?running?as?superuser?*/
		exit（1）;
	}

	/*
	?*?We?send?one?request?then?wait?5?seconds?printing?any
	?*?replies?that?come?back.??This?lets?us?send?a?request?to
	?*?a?broadcast?address?and?print?multiple?replies.
	?*/

	signal（SIGALRM?sig_alrm）;
	alarm（5）;	/*?5?second?time?limit?*/

	sender（）;	/*?send?the?request?*/

	for?（;;）?{
		struct?sockaddr_in	from;
		int			cc?fromlen;

		fromlen?=?sizeof（from）;
		if?（?（cc?=?recvfrom（s?（char?*）packet?packlen?0
		????		????（struct?sockaddr?*）&from?&fromlen））?			if?（errno?==?EINTR）
				continue;
			perror（“recvfrom?error“）;
			continue;
		}
		procpack（（char?*）packet?cc?&from）;
	}
}

/*
?*?Send?the?ICMP?address?mask?request.
?*/

sende