微软ping程序源代码完整版(下)

文章作者 100test 发表时间 2007:03:13 21:44:51
来源 100Test.Com百考试题网

if (argc >3)

{

datasize = atoi(argv[3]).

if (datasize == 0)

datasize = DEF_PACKET_SIZE.

if (datasize >1024) /* 用户给出的数据包大小太大 */

{

fprintf(stderr,"WARNING : data_size is too large !\n").

datasize = DEF_PACKET_SIZE.

}

}

else

datasize = DEF_PACKET_SIZE.

datasize = sizeof(IcmpHeader).

icmp_data = (char*)xmalloc(MAX_PACKET).

recvbuf = (char*)xmalloc(MAX_PACKET).

if (!icmp_data) {

fprintf(stderr,"HeapAlloc failed %d\n",GetLastError()).

ExitProcess(STATUS_FAILED).

}

memset(icmp_data,0,MAX_PACKET).

fill_icmp_data(icmp_data,datasize).

//

//显示提示信息

//

fprintf(stdout,"\nPinging %s ....\n\n",dest_ip).

for(int i=0.i{

int bwrote.

((IcmpHeader*)icmp_data)->i_cksum = 0.

((IcmpHeader*)icmp_data)->timestamp = GetTickCount().

((IcmpHeader*)icmp_data)->i_seq = seq_no .

((IcmpHeader*)icmp_data)->i_cksum = checksum((USHORT*)icmp_data,datasize).

bwrote = sendto(sockRaw,icmp_data,datasize,0,(struct sockaddr*)&.dest,sizeof(dest)).

if (bwrote == SOCKET_ERROR){

if (WSAGetLastError() == WSAETIMEDOUT) {

printf("Request timed out.\n").

continue.

}

fprintf(stderr,"sendto failed: %d\n",WSAGetLastError()).

ExitProcess(STATUS_FAILED).

}

if (bwrote < datasize ) {

fprintf(stdout,"Wrote %d bytes\n",bwrote).

}

bread = recvfrom(sockRaw,recvbuf,MAX_PACKET,0,(struct sockaddr*)&.from,&.fromlen).

if (bread == SOCKET_ERROR){

if (WSAGetLastError() == WSAETIMEDOUT) {

printf("Request timed out.\n").

continue.

}

fprintf(stderr,"recvfrom failed: %d\n",WSAGetLastError()).

ExitProcess(STATUS_FAILED).

}

if(!decode_resp(recvbuf,bread,&.from))

statistic . /* 成功接收的数目 */

Sleep(1000).

}

/*

Display the statistic result

*/

fprintf(stdout,"\nPing statistics for %s \n",dest_ip).

fprintf(stdout," Packets: Sent = %d,Received = %d, Lost = %d (%2.0f%% loss)\n",times,

statistic,(times-statistic),(float)(times-statistic)/times*100).

WSACleanup().

return 0.

}

/*

The response is an IP packet. We must decode the IP header to locate

the ICMP data

*/

int decode_resp(char *buf, int bytes,struct sockaddr_in *from) {

IpHeader *iphdr.

IcmpHeader *icmphdr.

unsigned short iphdrlen.

iphdr = (IpHeader *)buf.

iphdrlen = (iphdr->h_len) * 4 . // number of 32-bit words *4 = bytes

if (bytes < iphdrlen ICMP_MIN) {

printf("Too few bytes from %s\n",inet_ntoa(from->sin_addr)).

}

icmphdr = (IcmpHeader*)(buf iphdrlen).

if (icmphdr->i_type != ICMP_ECHOREPLY) {

fprintf(stderr,"non-echo type %d recvd\n",icmphdr->i_type).

return 1.

}

if (icmphdr->i_id != (USHORT)GetCurrentProcessId()) {

fprintf(stderr,"someone elses packet!\n").

return 1.

}

printf("%d bytes from %s:",bytes, inet_ntoa(from->sin_addr)).

printf(" icmp_seq = %d. ",icmphdr->i_seq).

printf(" time: %d ms ",GetTickCount()-icmphdr->timestamp).

printf("\n").

return 0.

}

USHORT checksum(USHORT *buffer, int size) {

unsigned long cksum=0.

while(size >1) {

cksum =*buffer .

size -=sizeof(USHORT).

}

if(size) {

cksum = *(UCHAR*)buffer.

}

cksum = (cksum >> 16) (cksum &. 0xffff).

cksum = (cksum >>16).

return (USHORT)(~cksum).

}

/*

Helper function to fill in various stuff in our ICMP request.

*/

void fill_icmp_data(char * icmp_data, int datasize){

IcmpHeader *icmp_hdr.

char *datapart.

icmp_hdr = (IcmpHeader*)icmp_data.

icmp_hdr->i_type = ICMP_ECHO.

icmp_hdr->i_code = 0.

icmp_hdr->i_id = (USHORT)GetCurrentProcessId().

icmp_hdr->i_cksum = 0.

icmp_hdr->i_seq = 0.

datapart = icmp_data sizeof(IcmpHeader).

//

// Place some junk in the buffer.

//

memset(datapart,E, datasize - sizeof(IcmpHeader)).

}

/******************* 附: ping命令执行时显示的画面 ***************\

* C:\Documents and Settings\houzhijiang>ping 236.56.54.12 *

* *

* Pinging 236.56.54.12 with 32 bytes of data: *

* *

* Request timed out. *

* Request timed out. *

* Request timed out. *

* Request timed out. *

* *

* Ping statistics for 236.56.54.12: *

* Packets: Sent = 4, Received = 0, Lost = 4 (100% loss), *

* *

\*********************************************************/

/*********************************************************\

* C:\Documents and Settings\houzhijiang>ping 127.0.0.1 *

* *

* Pinging 127.0.0.1 with 32 bytes of data: *

* *

* Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 *

* Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 *

* Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 *

* Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 *

* *

* Ping statistics for 127.0.0.1: *

* Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), *

* Approximate round trip times in milli-seconds: *

* Minimum = 0ms, Maximum = 0ms, Average = 0ms *

* *