/*---------------------------------------------------
called when the window received WSOCK_GETHOST.
get IP address and send data.
---------------------------------------------------*/
void OnGetHost(HWND hwnd, WPARAM wParam, LPARAM lParam)
{
struct hostent *pHostEnt;
unsigned long serveraddr;
if(g_hGetHost == NULL) return;
// success ?
if(WSAGETASYNCERROR(lParam) != 0)
{
SocketClose(hwnd, "failed to get IP address");
return;
}
// valid handle ?
if(g_hGetHost != (HANDLE)wParam) return;
// get IP address
pHostEnt = (struct hostent *)g_pGetHost;
serveraddr = *((unsigned long *)((pHostEnt->h_addr_list)[0]));
free(g_pGetHost); g_pGetHost = NULL;
g_hGetHost = NULL;
// send data
SNTPSend(hwnd, serveraddr);
}
/*---------------------------------------------------
start SNTP session
---------------------------------------------------*/
BOOL SNTPStart(HWND hwndSNTP)
{
char servername[BUFSIZE_SERVER];
unsigned long serveraddr;
if(m_socket != INVALID_SOCKET || m_hGetHost != NULL) return FALSE;
// get server name and port
m_port = GetServerPort(m_servername, servername);
if(m_port == -1)
{
Log(hwndSNTP, "invalid server name"); return FALSE;
}
// make a socket
m_socket = socket(PF_INET, SOCK_DGRAM, 0);
if(m_socket == INVALID_SOCKET)
{
Log(hwndSNTP, "socket() failed");
return FALSE;
}
serveraddr = inet_addr(servername);
// if server name is not "XXX.XXX.XXX.XXX"
if(serveraddr == INADDR_NONE)
{
// request IP address
m_pGetHost = malloc(MAXGETHOSTSTRUCT);
m_hGetHost = WSAAsyncGetHostByName(hwndSNTP, WSOCK_GETHOST,
servername, m_pGetHost, MAXGETHOSTSTRUCT);
if(m_hGetHost == NULL)
{
free(m_pGetHost); m_pGetHost = NULL;
SocketClose(hwndSNTP, "WSAAsyncGetHostByName() failed");
return FALSE;
}
return TRUE;
}
// send data
SNTPSend(hwndSNTP, serveraddr);
return TRUE;
}
/*---------------------------------------------------
start SNTP session
---------------------------------------------------*/
void SNTPStart(HWND hwnd, char *buf)
{
char servername[256];
unsigned long serveraddr;
if(g_socket != -1 || g_hGetHost != NULL) return;
// get server name and port
g_port = GetServerPort(buf, servername);
if(g_port == -1)
{
Log("invalid server name"); return;
}
// make a socket
g_socket = socket(PF_INET, SOCK_DGRAM, 0);
if(g_socket == INVALID_SOCKET)
{
Log("socket() failed");
g_socket = (SOCKET)-1; return;
}
serveraddr = inet_addr((char*)servername);
// if server name is not "XXX.XXX.XXX.XXX"
if(serveraddr == -1)
{
// request IP address
g_pGetHost = malloc(MAXGETHOSTSTRUCT);
g_hGetHost = WSAAsyncGetHostByName(hwnd, WSOCK_GETHOST,
servername, g_pGetHost, MAXGETHOSTSTRUCT);
if(g_hGetHost == 0)
{
SocketClose(hwnd, "WSAAsyncGetHostByName() failed");
return;
}
dwTickCountOnGetHost = GetTickCount();
return;
}
// send data
SNTPSend(hwnd, serveraddr);
}
