ping的源程序

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ping的源程序 ~h85BF5
// Module Name: Ping.c K&70{r
// 0ANZAX5
// Description: X4E%2-m@'
// This sample illustrates how an ICMP ping app can be written #( jw!d&
// using the SOCK_RAW socket type and IPPROTO_ICMP protocol. 87P>IO
// By creating a raw socket, the underlying layer does not change L=8<B=QT$
// the protocol header so that when we submit the ICMP header ]0)|7TV*
// nothing is changed so that the receiving end will see an m~u5kbHOi=
// ICMP packet. Additionally, we use the record route IP option
)Es\"LP]
// to get a round trip path to the endpoint. Note that the size X+}1
// of the IP option header that records the route is limited to 5nO% Ke=
// nine IP addresses. SNE#0L&#39; }
// T{Uc:Z
// Compile: YY!6/5*/]
// cl -o Ping Ping.c ws2_32.lib /Zp1 O1*NzY0Y%-
// wG< (F}VX
// Command Line Options/Parameters: !0C^TCuG
// Ping [host] [packet-size] E7)= `kSl
// HcV\"X,7S
// host String name of host to ping K/=_b<
// packet-size Integer size of packet to send 1, ~SS
// (smaller than 1024 bytes) `o?Ph&p}
// zyg  }F
//#pragma pack(1) GS Q/NYK
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#define WIN32_LEAN_AND_MEAN }sFm9j7yR
#include \"y<?Q
}1
#include OOz[-j>&#39;Y+
#include y tf b$;|
#include |s)?cpb
wB{;bB{
#define IP_RECORD_ROUTE 0x7 oejfU;+$
// )I-fU4?
// IP header structure x/ :4 {
// `j9$T:`
typedef struct _iphdr m%8q Zzqk
{ Jj^GWZRu
unsigned int h_len:4; // Length of the header RP`2)/sMT
unsigned int version:4; // Version of IP )2E%b+\"
unsigned char tos; // Type of service -6
Mm#sX
unsigned short total_len; // Total length of the packet ]> Y/r-!
unsigned short ident; // Unique identifier 5H:@ 8,B
unsigned short frag_and_flags; // Flags R& =f:sEi
unsigned char ttl; // Time to live ELh3 ^
unsigned char proto; // Protocol (TCP, UDP etc) K.SeK3(
unsigned short checksum; // IP checksum *N/hc
H\"+c)FGi
unsigned int sourceIP; p`+VrcCBOd
unsigned int destIP; w
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} IpHeader; amB@N6*
#define ICMP_ECHO 8 nJVp.*S
#define ICMP_ECHOREPLY 0 SQKt}kDbM
#define ICMP_MIN 8 // Minimum 8-byte ICMP packet (header) Gm&2R4)EP
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// zeTszT)
// ICMP header structure <\"I
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// &\"j@79Ym1~
typedef struct _icmphdr ^W[&#39;A]l
{ ZW* fOaj
BYTE i_type; \\G=bj;&eF
BYTE i_code; // Type sub code mCrU//G
USHORT i_cksum; dM gbW<uAu
USHORT i_id; a^*B5G1(&
USHORT i_seq; r &c_4%y
// This is not the standard header, but we reserve space for time rUvwpP\"k
ULONG timestamp; T/5nu?v
} IcmpHeader; z}mvX .j7
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// kEx8+2s=M
// IP option header - use with socket option IP_OPTIONS @#1cx
// NywB 3
typedef struct _ipoptionhdr _RgxKp/d
{ -uO%[/h;N
unsigned char code; // Option type kA1f[ AL
unsigned char len; // Length of option hdr rrW! X q
unsigned char ptr; // Offset into options x0y% \\
unsigned long addr[9]; // List of IP addrs nm<L&11
} IpOptionHeader; @+[Y0_
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#define DEF_PACKET_SIZE 32 // Default packet size ~oEXM ?M
#define MAX_PACKET 1024 // Max ICMP packet size V6A5(-%`y
#define MAX_IP_HDR_SIZE 60 // Max IP header size w/options >\\N$>\"~a
:7zI3Ml@7
BOOL bRecordRoute; (!^N~ =e;
int datasize; NB~*sP-l&
char *lpdest; W$x K^}
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// RXCygPT 
// Function: usage 7KYF16A4
// OV0cr
// Description: r&#39; 97\\|
// Print usage information *o2_EqXL*
// &#39;h+4zvI\"8
void usage(char *progname) )Uoe ~\\
{ 07E\".T%Ts
printf(\"usage: ping -r [data size]\\n\"); @b(gjOE
printf(\" -r record route\\n\"); b~N|DKj
printf(\" host remote machine to ping\\n\"); .(.G`aKnF
printf(\" datasize can be up to 1KB\\n\"); Yc( )&#39;6
ExitProcess(-1); ,L;c{[*
rh
#)c;i<Q3S
// {:q9:
// Function: FillICMPData E*#60z7F
// gB&#39;Ah-@,P
// Description: MyS7AL 
// Helper function to fill in various fields for our ICMP request X0J]6|du.
// ~$`YzK^*X
void FillICMPData(char *icmp_data, int datasize) qSs^}eN
{ UyfIAC$S
IcmpHeader *icmp_hdr = NULL; |
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char *datapart = NULL; #]hkQo
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icmp_hdr = (IcmpHeader*)icmp_data; ,,-3p#P bw
icmp_hdr->i_type = ICMP_ECHO; // Request an ICMP echo @g5]w&o_
icmp_hdr->i_code = 0; ^mb*w)-p?
icmp_hdr->i_id = (USHORT)GetCurrentProcessId(); AxQ/
icmp_hdr->i_cksum = 0; O&RHCR-
\\
icmp_hdr->i_seq = 0; #FM &#39;S|
(G;*B<|A
datapart = icmp_data + sizeof(IcmpHeader); Vp94mi#L }
// :CHd\\.\"%+1
// Place some junk in the buffer eT?LMBn\\
// <C xet~x
memset(datapart,&#39;E&#39;, datasize - sizeof(IcmpHeader)); 4 ETVyK|
} `Nr7N#g+u
C I0^eaFs
// f{oWd]eAhb
// Function: checksum >kT~X ,o
// @YELqUb*
// Description: biD7(AK
// This function calculates the 16-bit one&#39;s complement sum |Rc#Q<Vh|
// of the supplied buffer (ICMP) header DFMWgBL
// oxZ(qfjS
USHORT checksum(USHORT *buffer, int size) fz*6 B NJ
{ ececN{U/
unsigned long cksum=0; ;N|6C+y
eJ&#39;ojc3
while (size > 1) JT+P>\\\\];&#39;
{ eM}Xn^}
cksum += *buffer++; JG `QJ%
size -= sizeof(USHORT); )u$A!+fo
} H5n\" !!
if (size) +J2=\\YO
{ B*{CcQ<5
cksum += *(UCHAR*)buffer; I<$lpU_H
} vR-/c
cksum = (cksum >> 16) + (cksum & 0xffff); B!:(*lF
cksum += (cksum >>16); m2_B(-
return (USHORT)(~cksum); SkY|.w. 
// J &c}z4
// Function: DecodeIPOptions \"B.l j)
// >8ePx,+!
// Description: >J4_/p>Qs
// If the IP option header is present, find the IP options (HY|0Bgr
// within the IP header and print the record route option hF6EOCY6D
// values $AoN,B>
// ++xEMP)
void DecodeIPOptions(char *buf, int bytes) 1h|JKu0
{ Uc \\\\..Cf
IpOptionHeader *ipopt = NULL; |FH/Q-7[
IN_ADDR inaddr; }56\"4/  Z
int i;  s(F^P
HOSTENT *host = NULL; s>^*GQw
cvi+AZ=
ipopt = (IpOptionHeader *)(buf + 20); {V,rWg
+ ,0RrD )
printf(\"RR: \"); xqX~nV#TB
for(i = 0; i < (ipopt->ptr / 4) - 1; i++) qbpvTTF
{ j&#39;I$F1>Te
inaddr.S_un.S_addr = ipopt->addr; ^3F[^#\"
if (i != 0) RV.*_FG
printf(\" \"); ;N6L`|
host = gethostbyaddr((char *)&inaddr.S_un.S_addr, `[2nxP>w`
sizeof(inaddr.S_un.S_addr), AF_INET); ubjuuha\"
if (host) 2X&~!%-
printf(\"(%-15s) %s\\n\", inet_ntoa(inaddr), host->h_name); u I}S9
else qH: ` O%,
printf(\"(%-15s)\\n\", inet_ntoa(inaddr)); y{0`+/\\`
} #I&#39;W[\\l~+
return; 3k` \"%R.H
} s^TF+d?B
<W2}^q7F^
// z9}rT<hy
// Function: DecodeICMPHeader nud,ag
// /6B!& b2f
// Description: ;ob-&#39;
// The response is an IP packet. We must decode the IP header to -BfZ P5
// locate the ICMP data. e.hHpjWi?Z
// FKY|xG9
void DecodeICMPHeader(char *buf, int bytes, 28JWQ%-
struct sockaddr_in *from) dy N`9
{ ,+<NP}Yg#G
IpHeader *iphdr = NULL; = q9>~E{}
IcmpHeader *icmphdr = NULL; D@*<p h=
unsigned short iphdrlen; = zW}vm }
DWORD tick; ]f#ZU{A&#39;mt
static int icmpcount = 0; u!?cKZw
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iphdr = (IpHeader *)buf; W- 5Z\"m1I
// Number of 32-bit words * 4 = bytes F B-?{78~
iphdrlen = iphdr->h_len * 4; Lb;:<
tick = GetTickCount();
*-\"DZ
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if ((iphdrlen == MAX_IP_HDR_SIZE) && (!icmpcount)) |2
w,Np-
DecodeIPOptions(buf, bytes); 6cH.s+
+
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if (bytes < iphdrlen + ICMP_MIN) {\"hX_t
{ /NRdBN
printf(\"Too few bytes from %s\\n\", iV<4#aBg
inet_ntoa(from->sin_addr)); sk* AlSlM
} $OEhdz&Fi
icmphdr = (IcmpHeader*)(buf + iphdrlen); XIQfgrGZ
\"Z xM,kI
if (icmphdr->i_type != ICMP_ECHOREPLY) tx0`#x
{ HCj
/x<*F
printf(\"nonecho type %d recvd\\n\", icmphdr->i_type); ~+ _|J\"\\
return; lJZ-*\"9V
} [+7 Nu
// Make sure this is an ICMP reply to something we sent! @C\\>P49
// X MkyX&y
if (icmphdr->i_id != (USHORT)GetCurrentProcessId()) Z?XgY\\(a(Q
{ &#39;VH%cz*
printf(\"someone else&#39;s packet!\\n\"); M mihWD02
return ; NhP&sQO
} C
uS\"Wj
printf(\"%d bytes from %s:\", bytes, inet_ntoa(from->sin_addr)); +i %,+3#6
printf(\" icmp_seq = %d. \", icmphdr->i_seq); (YOp
printf(\" time: %d ms\", tick - icmphdr->timestamp); f;Cu@z{b
printf(\"\\n\"); ;&#39;\\#+GZ9p
h[Hn*g
icmpcount++; d&!ZCq#_e
return; :yLSLN
} 5)}3C_pmW
L `7~~
void ValidateArgs(int argc, char **argv) 9}\\{0;9
{ K1vm [Ne
int i; w]BZgF.
~ jR:oN
bRecordRoute = FALSE; ddf# c,SQ
lpdest = NULL; c<&#39;Pt4LY
datasize = DEF_PACKET_SIZE; (c{<JYEC
w(sD}YA)
for(i = 1; i < argc; i++) ERql^Yr
{ -Qs4 s
if ((argv[0] == &#39;-&#39;) || (argv[0] == &#39;/&#39;)) $oefG}h2
{ 8s,B,s.
switch (tolower(argv[1])) l8\"
{ ~w<u!
case &#39;r&#39;: // Record route option B&l5yI b
bRecordRoute = TRUE; %p5%Fs`sd
break; (lDbArq
y
default: ,tdV-9N[O
usage(argv[0]); gbP]!d:I
break; `0@onDQVc=
} Ap&Bwo 8b
} qpo3b7(N
else if (isdigit(argv[0])) WJefg
datasize = atoi(argv); #0K122oY
else _K(w &Kr
lpdest = argv; D%L}vugxK
} E$B7E@(U
} ~p9nAACU
// -6wjc rTD
// Function: main tOn 6
// }$6;g-|HX
// Description: -0Ws3
// Setup the ICMP raw socket, and create the ICMP header. Add <1r#hFUUL
// the appropriate IP option header, and start sending ICMP \"eqNd\"~
// echo requests to the endpoint. For each send and receive, p6UPP|-S
// we set a timeout value so that we don&#39;t wait forever for a $K_G|Wyi
// response in case the endpoint is not responding. When we N*Is_V\\R
// receive a packet decode it. d7g3V
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// h-0#h/u>M
int main(int argc, char **argv) u 2)#Ml
{ |.asg
pn5A6 #
WSADATA wsaData; Cob<N&#39;.
SOCKET sockRaw = INVALID_SOCKET; P#gY-k&Nr
struct sockaddr_in dest, PO$ OXw
from; @Czj] t`
int bread, E#5$O2b#
fromlen = sizeof(from), lZ\\Si
timeout = 1000, ;z>?
- j
ret; {}Q A#:V
char *icmp_data = NULL, S4&#39;\\=w #
*recvbuf = NULL; h 8ND=(
unsigned int addr = 0; i&%/]Nq
USHORT seq_no = 0; Dej2-Y
struct hostent *hp = NULL; =Nc
}XFq
IpOptionHeader ipopt; 1=9M@r~ ^
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aYmC LLj
if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) [1 ?
{
T&/ ]|4
printf(\"WSAStartup() failed: %d\\n\", GetLastError()); Pd~{XM,yfW
return -1; z-Ndv;:
} p
c=f,
ValidateArgs(argc, argv); +im>|
Pr!H>dH8o
// o~(/Twxam
// WSA_FLAG_OVERLAPPED flag is required for SO_RCVTIMEO, saj%[Gsy
// SO_SNDTIMEO option. If NULL is used as last param for
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// WSASocket, all I/O on the socket is synchronous, the iz0GL&<
// internal user mode wait code never gets a chance to CBVL/pxy
// execute, and therefore kernel-mode I/O blocks forever. ^qro0]\"LD
// A socket created via the socket function has the over- ZITic&>W
// lapped I/O attribute set internally. But here we need eL`}j9
// to use WSASocket to specify a raw socket. z87_/(nu
// *wd@YMOP
// If you want to use timeout with a synchronous ?e. Ge0&
// nonoverlapped socket created by WSASocket with last #j?SdQ
// param set to NULL, you can set the timeout by using w9W0j
// the select function, or you can use WSAEventSelect and RaBq@r*(

// set the timeout in the WSAWaitForMultipleEvents O7x&#39;q<PFU
// function. DJGq=*
// M#U#I :z%
sockRaw = WSASocket (AF_INET, SOCK_RAW, IPPROTO_ICMP, NULL, 0, O*:8gu&#39;Y2
WSA_FLAG_OVERLAPPED); ;#>,eD2u
if (sockRaw == INVALID_SOCKET) l|Z<p
D
{ O6Gg?j
printf(\"WSASocket() failed: %d\\n\", WSAGetLastError()); )HFl 0[vT
return -1; 3H&#39;+7
[~qH
} Q~L\"Mr8>V
if (bRecordRoute) )iiwxpdw
{ qDPpGI-Y2e
// Setup the IP option header to go out on every ICMP packet pR VL}^Rk
// 5nhc|E)C
ZeroMemory(&ipopt, sizeof(ipopt)); KT5\"/fv
ipopt.code = IP_RECORD_ROUTE; // Record route option z [qO5z~I
ipopt.ptr = 4; // Point to the first addr offset @+S5\"W
ipopt.len = 39; // Length of option header bN#)F  
& q(D90w.
ret = setsockopt(sockRaw, IPPROTO_IP, IP_OPTIONS, -6+&?f
(char *)&ipopt, sizeof(ipopt)); fRTQ5V
if (ret == SOCKET_ERROR) D [#1~M
{ Ef;OrE\"\"
printf(\"setsockopt(IP_OPTIONS) failed: %d\\n\", >F zu]G4]
WSAGetLastError()); FS%Xq-c
} ~CQYF,[Th
} +G3&{#D ?
// Set the send/recv timeout values Z[baQO
// 7W[}7Y 
bread = setsockopt(sockRaw, SOL_SOCKET, SO_RCVTIMEO, HR55|`]
(char*)&timeout, sizeof(timeout)); _5vAn t*
if(bread == SOCKET_ERROR) ZM/*cA!\"
{ \">}l8MA
printf(\"setsockopt(SO_RCVTIMEO) failed: %d\\n\", )W!8,e+%
WSAGetLastError()); 12*&#39;rU;*
return -1; F#KO!\\iA+
} 2]n\"7Z8(v8
timeout = 1000; `y; s1nL
bread = setsockopt(sockRaw, SOL_SOCKET, SO_SNDTIMEO, 6R V]9
(char*)&timeout, sizeof(timeout)); hM\")DmvB4
if (bread == SOCKET_ERROR) +U9Gj#
{ ZcgSVMqEX
printf(\"setsockopt(SO_SNDTIMEO) failed: %d\\n\", jZu\">Eh,
WSAGetLastError()); j?D=Ij\"o
return -1; elCDPZTf
} 6%Ap/zvCZ>
memset(&dest, 0, sizeof(dest)); _7
>$&#39;V{
// qy=4zOOD#
// Resolve the endpoint&#39;s name if necessary 8qL*Nf
// @mBZu!,
dest.sin_family = AF_INET; _#xS
1sD
if ((dest.sin_addr.s_addr = inet_addr(lpdest)) == INADDR_NONE) ~F?s\\kp6
{ ^c3~CD5H 3
if ((hp = gethostbyname(lpdest)) != NULL) ,R/HT@
{ WGFp<R
memcpy(&(dest.sin_addr), hp->h_addr, hp->h_length); fH? e9E4l
dest.sin_family = hp->h_addrtype; S 4uX utd
printf(\"dest.sin_addr = %s\\n\", inet_ntoa(dest.sin_addr)); W1S7%6y_1
} % LeG.~?
else GJN\"43
{ N>##} i
printf(\"gethostbyname() failed: %d\\n\", .lnyn|MVb
WSAGetLastError()); Z.6M~
return -1; uFQ;}k;}
}  h>\\T1PM
} ?WPuTPw{

// qv\\n]M_&
// Create the ICMP packet ~ 8L]!OQ9=
// #1fT\\aP
datasize += sizeof(IcmpHeader); FW* k O
*IBT!@*Q&
icmp_data = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, 7A:k
MAX_PACKET); @yc/1u $r
recvbuf = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, : :;YS9e
MAX_PACKET); !O|d,)$q
if (!icmp_data) gbvM2
{ %[3?vX
printf(\"HeapAlloc() failed: %d\\n\", GetLastError()); w3,DsEXu
return -1; [[vu#&#39;bc
} m .:2G
memset(icmp_data,0,MAX_PACKET); C1V:_-
FillICMPData(icmp_data,datasize); sGBm[lplz
// ;dC>$_P?
// Start sending/receiving ICMP packets [nSlkl 
// !UzMuGj
while(1) J&hzr t
{ CIt%7 \\c
static int nCount = 0; {zck Y
int bwrote; ;nSOe AF)Q
vk1E!T9X
if (nCount++ == 4) pzcl@
break; /
19ZyQw9
h>:eu#
((IcmpHeader*)icmp_data)->i_cksum = 0; /\\wm/Yx?S
((IcmpHeader*)icmp_data)->timestamp = GetTickCount(); DGJt$o=&@
((IcmpHeader*)icmp_data)->i_seq = seq_no++; Hs#q 7
((IcmpHeader*)icmp_data)->i_cksum = @s % !R
checksum((USHORT*)icmp_data, datasize); XIRvIwO
zf.&E3Sn
bwrote = sendto(sockRaw, icmp_data, datasize, 0, 0ME.O +
(struct sockaddr*)&dest, sizeof(dest)); g&?RQ
if (bwrote == SOCKET_ERROR) 2
e9lk$
{ 
V6a+VfH
if (WSAGetLastError() == WSAETIMEDOUT) bPMkBm
{ #7BX,jvn>
printf(\"timed out\\n\"); H^J waF
continue; P0O=veCf
} 5hg ^K^ZZ
printf(\"sendto() failed: %d\\n\", WSAGetLastError()); o?((FW5.;
return -1; _d*QA{
} Tp&7C
Nl|
if (bwrote < datasize) NKRI|&#39;Y,
{ %P HYJc
printf(\"Wrote %d bytes\\n\", bwrote); ;T\\&#39;|[bY 
} gkMyo`
bread = recvfrom(sockRaw, recvbuf, MAX_PACKET, 0, s%Irh;Bs
(struct sockaddr*)&from, &fromlen); #J|DW C!#d
if (bread == SOCKET_ERROR) `R@b`3*%v
{ 2Wp)CI<\\D
if (WSAGetLastError() == WSAETIMEDOUT) $4u8\"ne)
{ iiD }2y b
printf(\"timed out\\n\");  j*#k%;c
continue; y vo4 .u
} (bD&#39;SWE
printf(\"recvfrom() failed: %d\\n\", WSAGetLastError()); O~&j}WN
return -1; y7/=-~ 
} {mmQv~|5q
DecodeICMPHeader(recvbuf, bread, &from); E0aJ~A(Hv
;b;Bl:%?
Sleep(1000); hhcO ]*
} <jIuVX
// Cleanup #Z1 <lAy
// 7Kn}KO!Y8
if (sockRaw != INVALID_SOCKET) Bf8[(oc~
closesocket(sockRaw); `*w!S8}m;
HeapFree(GetProcessHeap(), 0, recvbuf); ).8NZ Aj

HeapFree(GetProcessHeap(), 0, icmp_data); &#39;l6SL- <
s>ohXISB[
WSACleanup(); dr^MW?{a\\
return 0; >\\&#39;gIIs
}