ping的源程序

来源： 作者：网络收集 出处：巧巧读书 2005-11-06 进入讨论组

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//
// Function: FillICMPData
//
// Description:
// Helper function to fill in various fields for our ICMP request
//
void FillICMPData(char *icmp_data, int datasize)
{
IcmpHeader *icmp_hdr = NULL;

char *datapart = NULL;

icmp_hdr = (IcmpHeader*)icmp_data;
icmp_hdr->i_type = ICMP_ECHO; // Request an 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));
}

//
// Function: checksum
//
// Description:
// This function calculates the 16-bit one's complement sum
// of the supplied buffer (ICMP) header
//
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);
}
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