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#include "common.h"
USHORT ip_checksum(USHORT* buffer, int size)
{
unsigned long cksum = 0;
// Sum all the words together, adding the final byte if size is odd
while (size > 1) {
cksum += *buffer++;
size -= sizeof(USHORT);
}
if (size) {
cksum += *(UCHAR*)buffer;
}
// Do a little shuffling
cksum = (cksum >> 16) + (cksum & 0xffff);
cksum += (cksum >> 16);
// Return the bitwise complement of the resulting mishmash
return (USHORT)(~cksum);
}
SOCKET sd = -1;
char packet[1024];
char recv_buff[1024];
USHORT seq_no = 0;
bool inited = false;
extern int init_raw_ping()
{
WSAData wsaData;
if (WSAStartup(MAKEWORD(1, 1), &wsaData) != 0) {
WSACleanup();
return 1;
}
if(sd != -1)
closesocket(sd);
// Create the socket
//sd = WSASocket(AF_INET, SOCK_RAW, IPPROTO_ICMP, 0, 0, 0);
sd = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
if (sd == INVALID_SOCKET) {
return 2;
}
int ttl = 255;
if (setsockopt(sd, IPPROTO_IP, IP_TTL, (const char*)&ttl, sizeof(ttl)) == SOCKET_ERROR) {
return 3;
}
int our_recv_timeout = 100; // so we ca do multiple recv calls
if(setsockopt(sd, SOL_SOCKET, SO_RCVTIMEO, (const char *)&our_recv_timeout, sizeof(int)) == SOCKET_ERROR) {
return 4;
}
ICMPHeader *header = (ICMPHeader *)packet;
header->type = PT_ICMP_ECHO_REQUEST;
header->code = 0;
header->id = (USHORT)GetCurrentProcessId();
inited = true;
if(raw_ping("127.0.0.1", 500) >= 0) {
return 0;
}
inited = false;
return 5;
}
extern int raw_ping(char *host, int timeout)
{
if(!inited) return -1;
// Initialize the destination host info block
sockaddr_in dest;
memset(&dest, 0, sizeof(dest));
// Turn first passed parameter into an IP address to ping
unsigned int addr = inet_addr(host);
if (addr != INADDR_NONE) {
// It was a dotted quad number, so save result
dest.sin_addr.s_addr = addr;
dest.sin_family = AF_INET;
}
else {
// Not in dotted quad form, so try and look it up
hostent* hp = gethostbyname(host);
if (hp != 0) {
// Found an address for that host, so save it
memcpy(&(dest.sin_addr), hp->h_addr, hp->h_length);
//dest.sin_family = hp->h_addrtype;
dest.sin_family = AF_INET;
}
else {
// Not a recognized hostname either!
if(options.logging) CallService(PLUG "/Log", (WPARAM)"rawping error: unrecognised host", 0);
return -1;
}
}
ICMPHeader *header = (ICMPHeader *)packet;
header->seq = ++seq_no;
header->checksum = 0;
header->checksum = ip_checksum((USHORT*)header, sizeof(ICMPHeader));
bool use_hi_res = false;
LARGE_INTEGER hr_freq, hr_send_time;
DWORD send_time;
if(QueryPerformanceFrequency(&hr_freq)) {
use_hi_res = true;
QueryPerformanceCounter(&hr_send_time);
} else
send_time = GetTickCount();
// send packet
int bwrote = sendto(sd, (char*)packet, sizeof(ICMPHeader), 0, (sockaddr*)&dest, sizeof(dest));
if (bwrote == SOCKET_ERROR) {
if(options.logging) CallService(PLUG "/Log", (WPARAM)"rawping error: unable to send", 0);
return -1;
}
// Wait for the ping reply
sockaddr_in source;
int fromlen = sizeof(source);
IPHeader *reply_header = (IPHeader *)recv_buff;
ICMPHeader *reply;
DWORD start, current_time;
LARGE_INTEGER hr_start, hr_current_time, hr_timeout;
if(use_hi_res) {
hr_timeout.QuadPart = (timeout * hr_freq.QuadPart / 1000);
QueryPerformanceCounter(&hr_start);
hr_current_time = hr_start;
} else {
start = GetTickCount();
current_time = start;
}
while(((use_hi_res && (hr_current_time.QuadPart < hr_start.QuadPart + hr_timeout.QuadPart))
|| (!use_hi_res && current_time < start + timeout)))
{
int bread = recvfrom(sd, recv_buff, 1024, 0, (sockaddr*)&source, &fromlen);
if(use_hi_res)
QueryPerformanceCounter(&hr_current_time);
else
current_time = GetTickCount();
if (bread == SOCKET_ERROR) {
if(WSAGetLastError() != WSAETIMEDOUT) {
if(options.logging) CallService(PLUG "/Log", (WPARAM)"rawping error: socket error...cycling", 0);
}
continue;
}
if(reply_header->proto != ICMP_PROTO)
if(options.logging) CallService(PLUG "/Log", (WPARAM)"rawping error: packet not ICMP...cycling", 0);
continue;
if(reply_header->tos != 0)
if(options.logging) CallService(PLUG "/Log", (WPARAM)"rawping error: TOS not 0...cycling", 0);
continue;
reply = (ICMPHeader *)(recv_buff + reply_header->h_len * 4);
if((unsigned)bread < reply_header->h_len * 4 + sizeof(ICMPHeader)) {
if(options.logging) CallService(PLUG "/Log", (WPARAM)"rawping error: short header", 0);
continue;
}
if(reply->id != (USHORT)GetCurrentProcessId())
if(options.logging) CallService(PLUG "/Log", (WPARAM)"rawping error: wrong ID...cycling", 0);
continue;
if(reply->type != PT_ICMP_ECHO_REPLY && reply->type != PT_ICMP_SOURCE_QUENCH) {
if(options.logging) CallService(PLUG "/Log", (WPARAM)"rawping error: wrong type...cycling", 0);
continue;
}
//if(reply->seq < seq_no) continue;
//if(reply->seq > seq_no) return -1;
if(reply->seq != seq_no) {
if(options.logging) CallService(PLUG "/Log", (WPARAM)"rawping error: wrong sequence number...cycling", 0);
continue;
}
if(reply->type == PT_ICMP_SOURCE_QUENCH) {
char buff[1024];
sprintf(buff, Translate("Host %s requests that you reduce the amount of traffic you are sending."), host);
MessageBox(0, buff, Translate(PLUG " Warning"), MB_OK | MB_ICONWARNING);
}
if(use_hi_res) {
LARGE_INTEGER ticks;
ticks.QuadPart = hr_current_time.QuadPart - hr_send_time.QuadPart;
return (int)(ticks.QuadPart * 1000 / hr_freq.QuadPart);
} else
return current_time - send_time;
}
if(options.logging) CallService(PLUG "/Log", (WPARAM)"rawping error: timeout", 0);
return -1;
}
extern int cleanup_raw_ping()
{
if(inited) {
closesocket(sd);
sd = -1;
WSACleanup();
}
return 0;
}
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