#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
?
#define?PACKET_SIZE?4096
#define?MAX_WAIT_TIME???5
#define?MAX_NO_PACKETS??10000
#define?MAX_ARP_SIZE?100
?
?
char?*addr[2];
char?sendpacket[PACKET_SIZE];
char?recvpacket[PACKET_SIZE];
int?sockfddatalen?=?56;
int?nsend?=?0?nreceived?=?0;
double?temp_rtt[MAX_NO_PACKETS];
double?all_time?=?0;
double?min?=?0;
double?max?=?0;
double?avg?=?0;
double?mdev?=?0;
char?local_mac[18];

struct?sockaddr_ll?dest_addr;
struct?sockaddr_in?from;
struct?timeval?tvrecv;
struct?timeval?tval;
pid_t?pid;
?
struct?arp_table_item
{
	char?ip_addr[16];
	char?mac_addr[18];
}arp_table[MAX_ARP_SIZE];
int?arp_item_index=0;


void?statistics（int?sig）;
void?send_packet（char?*dest）;
void?recv_packet（char?*dest）;
void?computer_rtt（void）;
void?tv_sub（struct?timeval?*outstruct?timeval?*in）;
int?pack（char?*dest）;
int?unpack（char?*bufint?len）;
unsigned?short?cal_checksum（unsigned?short?*addrint?len）;
?
void?init_arp（）
{
	FILE?*fp=fopen（“arp_table““r“）;
	if（!fp）
	{
		printf（“can‘t?open?arp_table!\n“）;
		exit（0）;
	}
	fscanf（fp“%s“arp_table[0].ip_addr）;
	fscanf（fp“%s“arp_table[0].mac_addr）;
	++arp_item_index;
	while（!feof（fp））
	{
		fscanf（fp“%s“arp_table[arp_item_index].ip_addr）;
		fscanf（fp“%s“arp_table[arp_item_index].mac_addr）;
		++arp_item_index;
	}
}

init_device（）
{
	FILE?*fp=fopen（“device““r“）;
	if（!fp）
	{
		printf（“can‘t?open?the?device!\n“）;
		exit（0）;
	}
	fscanf（fp“%s“l(fā)ocal_mac）;
	fscanf（fp“%s“l(fā)ocal_mac）;
}

/*計(jì)算rtt最小、大值，平均值，算術(shù)平均數(shù)差*/
void?computer_rtt（）
{
????double?sum_avg?=?0;
????int?i;
????min?=?max?=?temp_rtt[0];
????avg?=?all_time/nreceived;
?
????for（i=0;?i????????if（temp_rtt[i]?????????????min?=?temp_rtt[i];
????????else?if（temp_rtt[i]?>?max）
????????????max?=?temp_rtt[i];
?
????????if（（temp_rtt[i]-avg）?????????????sum_avg?+=?avg?-?temp_rtt[i];
????????else
????????????sum_avg?+=?temp_rtt[i]?-?avg;?
????????}
????mdev?=?sum_avg/nreceived;
}
?
/****統(tǒng)計(jì)數(shù)據(jù)函數(shù)****/
void?statistics（int?sig）
{
????computer_rtt（）;?????//計(jì)算rtt
????printf（“\n------?%s?ping?statistics?------\n“addr[0]）;
????printf（“%d?packets?transmitted%d?received%d%%?packet?losstime?%.f?ms\n“
????????nsendnreceived（nsend-nreceived）/nsend*100all_time）;
????printf（“rtt?min/avg/max/mdev?=?%.3f/%.3f/%.3f/%.3f?ms\n“
????????minavgmaxmdev）;
????close（sockfd）;
????exit（1）;
}
?
/****檢驗(yàn)和算法****/
unsigned?short?cal_chksum（unsigned?short?*addrint?len）
{
????int?nleft?=?len;
????int?sum?=?0;
????unsigned?short?*w?=?addr;
????unsigned?sh

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2017-05-01?08:55??static-route-master\
?????文件?????????600??2017-05-01?08:55??static-route-master\README.md
?????目錄???????????0??2017-05-01?08:55??static-route-master\report\
?????文件??????580253??2017-05-01?08:55??static-route-master\report\lab4_151220055（李曉霖）.pdf
?????目錄???????????0??2017-05-01?08:55??static-route-master\source?code\
?????目錄???????????0??2017-05-01?08:55??static-route-master\source?code\configuration.file\
?????文件??????????30??2017-05-01?08:55??static-route-master\source?code\configuration.file\arp_table
?????文件??????????24??2017-05-01?08:55??static-route-master\source?code\configuration.file\device
?????文件??????????86??2017-05-01?08:55??static-route-master\source?code\configuration.file\route_info
?????目錄???????????0??2017-05-01?08:55??static-route-master\source?code\source.c\
?????文件???????11114??2017-05-01?08:55??static-route-master\source?code\source.c\p1.c
?????文件????????2488??2017-05-01?08:55??static-route-master\source?code\source.c\p2.c
?????文件????????7383??2017-05-01?08:55??static-route-master\source?code\source.c\r.c