static CFDataRef IPCCallback(__unused CFMessagePortRef port, SInt32 messageID, __unused CFDataRef data, __unused void *info)
{
switch(messageID)
{
case ServerCommandGetIP:
{
if(publicIPState == IPStateInvalid)
{
SCNetworkReachabilityFlags flags;
SCNetworkReachabilityGetFlags(reachability, &flags);
ReachabilityCallback(reachability, flags, NULL);
}
if(publicIPData)
return publicIPData;
return CFStringCreateExternalRepresentation(kCFAllocatorDefault, CFSTR(""), kCFStringEncodingUTF8, 0);
}
case ServerCommandStop:
{
CFRunLoopStop(CFRunLoopGetMain());
return NULL;
}
case ServerCommandReload:
{
FetchIPAddress();
return NULL;
}
default:
return NULL;
}
}
static void ReachabilityCallback(__unused SCNetworkReachabilityRef target, SCNetworkReachabilityFlags flags, __unused void *info)
{
if(flags & kSCNetworkReachabilityFlagsReachable)
{
FetchIPAddress();
}
else
{
CFRelease(publicIPData);
publicIPData = NULL;
publicIPState = IPStateInvalid;
}
}
int CheckForNewIPAddress(unsigned int *LocalAddr) {
IPECHO_MESSAGE Msg ;
int Socket ;
fd_set SocketArray ;
int Result, ResponseLength ;
struct sockaddr_in sin;
int Tries = 10 ;
unsigned int EchoServerIPAddress ;
struct timeval tv = {0,0} ;
int BytesSent ;
//if ((EchoServerIPAddress = FetchIPAddress(ECHO_SERVER_TO_USE)) == 0) {
if ((EchoServerIPAddress = FetchIPAddress(TZO_ECHO_SERVER)) == 0) {
printf("115 EchoServerIPAddress = %d \n",EchoServerIPAddress);
printf("Unable to contact TZO Echo Servers\n") ;
return(-1) ;
}
printf("119 EchoServerIPAddress = %d \n",EchoServerIPAddress);
if ((Socket = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
printf("Unable to create a socket\n") ;
return(-1) ;
}
// test
// EchoServerIPAddress = 0x401BA664;--->"No resonce from server\n"
// EchoServerIPAddress = 0x64A61B40 ;
sin.sin_family = AF_INET ;
sin.sin_addr.s_addr = EchoServerIPAddress ;
sin.sin_port = htons(IPECHO_PORT) ;
Msg.ID = IPECHO_ID_CLIENT ;
Msg.Request = IPECHO_REQUEST_ECHO ;
Msg.IPAddress = *LocalAddr ;
Msg.Signature = CalcIPEchoSignature(&Msg) ;
ResponseLength = 0 ;
printf("LocalAddr =%d \n",Msg.IPAddress);
if ((BytesSent = sendto(Socket, (unsigned char *)&Msg, sizeof(Msg), 0, (const struct sockaddr *)&sin, sizeof(sin))) < 0) {
//sin.sin_addr.s_addr =0x64A61B40 ;//0x401BA664;
//if ((BytesSent = sendto(Socket, (unsigned char *)&Msg, sizeof(Msg), 0, (const struct sockaddr *)&sin, sizeof(sin))) < 0) {
printf("Unable to sendto socket\n") ;
close(Socket) ;
return(-1) ;
}
while (Tries--) {
tv.tv_sec = 0 ;
tv.tv_usec = 0 ;
FD_ZERO(&SocketArray) ;
FD_SET(Socket, &SocketArray) ;
tv.tv_sec = 1 ;
tv.tv_usec = 0 ;
Result = select(Socket+1, &SocketArray, NULL, NULL, &tv) ;
if (Result)
break ;
sleep(1) ;
}
if (!Result) {
printf("No resonce from server\n") ;
close(Socket) ;
return(-1) ;
}
if ((ResponseLength = recvfrom(Socket, (unsigned char *)&Msg, 16, 0, 0, 0)) <= 0) {
printf("Bad responce from server\n") ;
close(Socket) ;
return(-1) ;
}
close(Socket) ;
if (ResponseLength == sizeof(IPECHO_MESSAGE)) {
*LocalAddr = FlipByteOrder(Msg.IPAddress) ;
return 1 ;
}
printf("strange server response, are you connecting to the right server?\n") ;
return(-1) ;
}