實現PING功能

實現ping功能 具體細節可以看注釋

#include

#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define max_size 1024
char send_buf[max_size]
;char recv_buf[max_size]
;int nsend =
0, nrecv =0;
//計數器
int datalen =56;
//統計結果
void
statistics
(int signum)
//校驗和演算法
intcalc_chsum
(unsigned
short
*buf,
int len)
//處理資料大小是奇數,在最後乙個位元組後面補0
if(n ==1)
//將得到的sum值的高2位元組和低2位元組相加
sum =
(sum >>16)
+(sum &
0xffff);
//處理溢位的情況
sum +
= sum >>16;
answer =
~sum;
return answer;
}int
pack
(int pack_num)
packsize =
8+ datalen;
//icmp報頭8位元組
icmp-
>icmp_cksum =
calc_chsum((
unsigned
short
*)icmp, packsize)
;//計算校驗和
return packsize;
}int
send_packet
(int sockfd,
struct sockaddr *paddr)
return0;
}struct timeval time_sub
(struct timeval *tv_send,
struct timeval *tv_recv)
ts.tv_sec = tv_recv-
>tv_sec - tv_send-
>tv_sec;
ts.tv_usec = tv_recv-
>tv_usec - tv_send-
>tv_usec;
return ts;
}int
unpack
(int len,
struct timeval *tv_recv,
struct sockaddr *paddr,
char
*ipname)
//判斷是否全為傳送程序,回應icmp包if(
ntohs
(icmp-
>icmp_id)
==getpid()
&& icmp-
>icmp_type == icmp_echoreply)
return0;
}int
recv_packet
(int sockfd,
char
*ipname)
//ipname傳送方位址if(
gettimeofday
(&tv,
null
)<0)
unpack
(n,&tv,
&from_addr, ipname)
;return0;
}int
main
(int argc,
char
*ar**)
//獲取icmp資訊if(
(protocol =
getprotobyname
("icmp"))
==null
)//建立原始套接字if(
(sockfd =
socket
(af_inet, sock_raw, protocol-
>p_proto)
)<0)
//ip層原始套接字 ip包頭自動加封
//**root許可權,設定當前使用者許可權
setuid
(getuid()
);//擴大套接字接受緩衝區到50kb(見size),減少接受緩衝區溢位的可能性if(
setsockopt
(sockfd, sol_socket, so_rcvbuf,
&size,
sizeof
(size)
)<0)
//填充對方位址
bzero
(&peer_addr,
sizeof
(peer_addr));
peer_addr.sin_family = af_inet;
//判斷是主機名還是ip
//不是ipif(
(netaddr =
inet_addr
(ar**[1]
))== inaddr_none)
memcpy((
char*)
&peer_addr.sin_addr, host-
>h_addr, host-
>h_length);}
else
//註冊訊號處理函式
signal
(sigalrm, statistics)
;signal
(sigint, statistics)
;alarm(5
);//列印開始資訊
printf
("ping %s(%s) %d bytes of data.\n"
, ar**[1]
,inet_ntoa
(peer_addr.sin_addr)
, datalen)
;//傳送報文和接受報文
while(1
)exit
(exit_success)
;}

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