<
stdio.h
>
#include
<
signal.h
>
#include
<
arpa
/inet.h
>
#include
<
sys/
types.h
>
#include
<
sys/
socket.h
>
#include
<
unistd.h
>
#include
<
netinet/in
.h>
#include
<
netinet
/ip.h
>
#include
<
netinet
/ip_icmp.h
>
#include
<
netdb.h
>
#include
<
setjmp.h
>
#include
<
errno.h
>
#define
packet_size 4096
#define
max_wait_time 5
#define
max_no_packets 3
char
sendpacket[packet_size];
char
recvpacket[packet_size];
intsockfd,datalen=56
;int
nsend=0
,nreceived=0
;struct
sockaddr_in dest_addr;
pid_t pid;
struct
sockaddr_in from;
struct
timeval tvrecv;
void
statistics(
intsigno);
unsigned
short
cal_chksum(unsigned
short
*addr,
intlen);
intpack(
intpack_no);
void
send_packet(
void
);void
recv_packet(
void
);int
unpack(
char
*buf,
intlen);
void
tv_sub(
struct
timeval
*out
,struct
timeval *in
);void
statistics(
intsigno)
/*校驗和演算法
*/unsigned
short
cal_chksum(unsigned
short
*addr,
intlen)
/*若icmp報頭為奇數個位元組，會剩下最後一位元組。把最後乙個位元組視為乙個2位元組資料的高位元組，這個2位元組資料的低位元組為0，繼續累加
*/if
( nleft==1
)sum
=(sum
>>16)
+(sum
&0xffff
);sum
+=(sum
>>
16);
answer
=~sum;
return
answer;}/*
設定icmp報頭
*/int
pack(
intpack_no)
/*傳送三個icmp報文
*/void
send_packet()
sleep(
1);
/*每隔一秒傳送乙個icmp報文*/}
}/*接收所有icmp報文
*/void
recv_packet()
gettimeofday(
&tvrecv,null);
/*記錄接收時間
*/if
(unpack(recvpacket,n)
==-1
)continue
;nreceived++;
}}/*剝去icmp報頭
*/int
unpack(
char
*buf,
intlen)
/*確保所接收的是我所發的的icmp的回應
*/if
( (icmp
->
icmp_type
==icmp_echoreply)
&&(icmp
->
icmp_id
==pid) )
else
return-1
;}main(
intargc,
char
*argv)
if( (protocol
=getprotobyname(
"icmp
") )
==null)
/*生成使用icmp的原始套接字,這種套接字只有root才能生成
*/if
( (sockfd
=socket(af_inet,sock_raw,protocol
->
p_proto) )
<0)
/***root許可權,設定當前使用者許可權
*/setuid(getuid());
/*擴大套接字接收緩衝區到50k這樣做主要為了減小接收緩衝區溢位的
的可能性,若無意中ping乙個廣播位址或多播位址,將會引來大量應答
*/setsockopt(sockfd,sol_socket,so_rcvbuf,
&size,
sizeof
(size) );
bzero(
&dest_addr,
sizeof
(dest_addr));
dest_addr.sin_family
=af_inet;
/*判斷是主機名還是ip位址
*/if
( inaddr
=inet_addr(argv[1])
==inaddr_none)
memcpy( (
char*)
&dest_addr.sin_addr,host
->
h_addr,host
->
h_length);
}else
/*是ip位址
*/memcpy( (
char*)
&dest_addr,(
char*)
&inaddr,host
->
h_length);
/*獲取main的程序id,用於設定icmp的標誌符
*/pid
=getpid();
printf(
"ping %s(%s): %d bytes data in icmp packets.\n
",argv[1],
inet_ntoa(dest_addr.sin_addr),datalen);
send_packet();
/*傳送所有icmp報文
*/recv_packet();
/*接收所有icmp報文
*/statistics(sigalrm);
/*進行統計
*/return0;
}/*兩個timeval結構相減
*/void
tv_sub(
struct
timeval
*out
,struct
timeval *in
)out
->
tv_sec
-=in
->
tv_sec;}/*
------------- the end -----------*/
仍然需要注意許可權的問題，按照如下方式編譯：
sudo gcc myping.c -o myping
sudo chmod u+s myping
./myping www.163.com
執行顯示結果：
ping www.cn.ibm.com(121.195.178.238): 56 bytes data in icmp packets.
64 byte from 121.195.178.238: icmp_seq=1 ttl=242 rtt=3029.000 ms
64 byte from 121.195.178.238: icmp_seq=2 ttl=242 rtt=2020.000 ms
64 byte from 121.195.178.238: icmp_seq=3 ttl=242 rtt=1010.000 ms
--------------------ping statistics-------------------
3 packets transmitted, 3 received , %0 lost
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