C + + Implementation Ping Program instance _c language

This article illustrates the method of implementing Ping Program in C + +. Share to everyone for your reference. The implementation methods are as follows:

This instance involves sending and echoing ICMP packets, and the ping code is as follows:

Copy Code code as follows:

DWORD WINAPI ThreadProc (LPVOID lParam)
{
Cinitsock Initsock;

HWND hwnd = (HWND) LParam; Get handle from argument
Char szip[64] ={0};
:: Getdlgitemtexta (HWnd, idc_ip, Szip, sizeof (Szip)); To get an IP address from a control
1. To create an original socket with a protocol type of IPPROTO_ICMP, set socket properties
Socket Sraw =:: Socket (af_inet, Sock_raw, ipproto_icmp);
SetTimeout (Sraw, 1000, TRUE);

2. Create and initialize ICMP packets
Char buff[sizeof (ICMP_HDR) +32] = {0};
icmp_hdr* picmp = (icmp_hdr*) buff;
Picmp->icmp_type = 8;
Picmp->icmp_code = 0;
picmp->icmp_checksum = 0;
picmp->icmp_id = (USHORT):: GetCurrentProcessId ();
picmp->icmp_sequence = 0;
Picmp->icmp_timestamp = 0;
Populating data
memset (&buff[sizeof (ICMP_HDR)], ' E ', 32);

Start sending and receiving packets
USHORT nseq = 0;
Sockaddr_in dest;
dest.sin_family = af_inet;
Dest.sin_port = htons (0);
Dest.sin_addr. S_un. S_ADDR = inet_addr (Szip); Inet_addr ("192.168.19.63"); INET_ADDR (szip); 220.181.111.147
CString strtoshow= "";
char* pszrevbuf = new char[1024]; [1024] = {0};
memset (pszrevbuf, 0, 1024);
Sockaddr_in from;
int nfromlen= sizeof (from);
while (TRUE)
{
3. Calling SendTo to send an ICMP request
static int ncount=0;
if (ncount++==4)
{
Break
}
Picmp->icmp_checksum = checksum (ushort*) buff, sizeof (ICMP_HDR) +32);
Picmp->icmp_sequence = ++nseq;
Picmp->icmp_timestamp =:: GetTickCount ();
int nret;
Nret =:: SendTo (Sraw, Buff, sizeof (ICMP_HDR) +32, 0, (sockaddr*) &dest, sizeof (dest));
if (nret = = socket_error)
{
int nerror =:: WSAGetLastError ();
Strtoshow + = "SendTo error\r\n";
return-1;
}

4. Call Recvfrom Accept ICMP response
Nret =:: Recvfrom (Sraw, PSZREVBUF, 1024, 0, (sockaddr*) &from, &nfromlen);
if (nret = = socket_error)
{
if (:: WSAGetLastError () = wsaetimedout)
{
Strtoshow + = "timeout\r\n";
Continue
}
Strtoshow + = "Recvfrom error\r\n";
return-1;
}
Parsing received ICMP packets
int Ntick =:: GetTickCount ();
if (Nret < sizeof (ICMP_HDR) +sizeof (Ipheader))
{
Strtoshow + = "less byte recved." \ r \ n ";
}
icmp_hdr* precvicmp = (icmp_hdr*) (pszrevbuf + sizeof (ipheader));//Skip IP header
if (precvicmp->icmp_type!= 0)
{
Strtoshow + = "not echo type";
return-1;
}
if (precvicmp->icmp_id!=:: GetCurrentProcessId ())
{
Strtoshow + + "is not the echo of this process \ r \ n";
return-1;
}
CString strtemp;
Strtemp.format ("Received from [%s]ip%04d bytes \ r \ n", Inet_ntoa (FROM.SIN_ADDR), nret);
Strtoshow + = strtemp;

strtemp = "";
Strtemp.format ("Serial Number:%d\r\n", precvicmp->icmp_sequence);
Strtoshow + = strtemp;

strtemp = "";
Strtemp.format ("Spend time:%d\r\n", Ntick-precvicmp->icmp_timestamp);
}
Strtoshow + = "**********************************";
:: Setdlgitemtexta (HWnd, Idc_data, strtoshow);
return 0;
}

The IP header and ICMP header code are as follows:

Copy Code code as follows:

USHORT Checksum (ushort* buff, int nsize)//222.89.166.13
{
unsigned long cksum=0;
Add the data to the cksum in Word units
while (Nsize > 1)
{
Cksum + = *buff++;
Nsize-= sizeof (USHORT);
}

If it is odd, extend the last word to two words, then add
if (nsize)
{
Cksum + = * (uchar*) buff;
}
Add the high 16 bits of the cksum to the lower 16 bits, and get the checksum after the inverse
Cksum = (cksum>>16) + (Cksum & 0xFFFF);
Cksum + = (cksum>>16);
Return (USHORT) (~cksum);
}
BOOL SetTimeout (SOCKET s, int ntime, BOOL brecv)
{
int ret =:: setsockopt (S, Sol_socket, brecv?) So_rcvtimeo:so_sndtimeo, (char*) &ntime, sizeof (ntime));
return ret!=socket_error;
}
typedef struct ICMP_HDR
{
unsigned char icmp_type;
unsigned char icmp_code;
unsigned short icmp_checksum;
The following is the Echo header
unsigned short icmp_id;
unsigned short icmp_sequence;
unsigned long icmp_timestamp;
}ICMP_HDR, *PICMP_HDR;

typedef struct _IPHEADER
{
Uchar Iphverlen;
Uchar Iptos;
USHORT iplength;
USHORT IpID;
USHORT Ipflag;
Uchar Ipttl;
Uchar Ipprotocol;
USHORT ipchecksum;
ULONG Ipsource;
ULONG ipdestination;
}ipheader, *pipheader;

I hope this article will help you with the C + + program design.