/*

Miranda NG: the free IM client for Microsoft* Windows*

Copyright (ñ) 2012-15 Miranda NG project (http://miranda-ng.org),
Copyright (c) 2000-12 Miranda IM project,
all portions of this codebase are copyrighted to the people
listed in contributors.txt.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

#include "..\..\core\commonheaders.h"
#include "netlib.h"

extern HANDLE hConnectionHeaderMutex, hSendEvent, hRecvEvent;

INT_PTR NetlibSend(WPARAM wParam, LPARAM lParam)
{
	NetlibConnection *nlc = (NetlibConnection*)wParam;
	NETLIBBUFFER *nlb = (NETLIBBUFFER*)lParam;
	INT_PTR result;

	if (nlb == NULL) {
		SetLastError(ERROR_INVALID_PARAMETER);
		return SOCKET_ERROR;
	}

	if (!NetlibEnterNestedCS(nlc, NLNCS_SEND))
		return SOCKET_ERROR;

	if (nlc->usingHttpGateway && !(nlb->flags & MSG_RAW)) {
		if (!(nlb->flags & MSG_NOHTTPGATEWAYWRAP) && nlc->nlu->user.pfnHttpGatewayWrapSend) {
			NetlibDumpData(nlc, (PBYTE)nlb->buf, nlb->len, 1, nlb->flags);
			result = nlc->nlu->user.pfnHttpGatewayWrapSend((HANDLE)nlc, (PBYTE)nlb->buf, nlb->len, nlb->flags | MSG_NOHTTPGATEWAYWRAP, NetlibSend);
		}
		else result = NetlibHttpGatewayPost(nlc, nlb->buf, nlb->len, nlb->flags);
	}
	else {
		NetlibDumpData(nlc, (PBYTE)nlb->buf, nlb->len, 1, nlb->flags);
		if (nlc->hSsl)
			result = si.write(nlc->hSsl, nlb->buf, nlb->len);
		else
			result = send(nlc->s, nlb->buf, nlb->len, nlb->flags & 0xFFFF);
	}
	NetlibLeaveNestedCS(&nlc->ncsSend);

	NETLIBNOTIFY nln = { nlb, result };
	NotifyFastHook(hSendEvent, (WPARAM)&nln, (LPARAM)&nlc->nlu->user);

	return result;
}

INT_PTR NetlibRecv(WPARAM wParam, LPARAM lParam)
{
	NetlibConnection *nlc = (NetlibConnection*)wParam;
	NETLIBBUFFER* nlb = (NETLIBBUFFER*)lParam;
	int recvResult;

	if (nlb == NULL) {
		SetLastError(ERROR_INVALID_PARAMETER);
		return SOCKET_ERROR;
	}

	if (!NetlibEnterNestedCS(nlc, NLNCS_RECV))
		return SOCKET_ERROR;

	if (nlc->usingHttpGateway && !(nlb->flags & MSG_RAW))
		recvResult = NetlibHttpGatewayRecv(nlc, nlb->buf, nlb->len, nlb->flags);
	else {
		if (nlc->hSsl)
			recvResult = si.read(nlc->hSsl, nlb->buf, nlb->len, (nlb->flags & MSG_PEEK) != 0);
		else
			recvResult = recv(nlc->s, nlb->buf, nlb->len, nlb->flags & 0xFFFF);
	}
	NetlibLeaveNestedCS(&nlc->ncsRecv);
	if (recvResult <= 0)
		return recvResult;

	NetlibDumpData(nlc, (PBYTE)nlb->buf, recvResult, 0, nlb->flags);

	if ((nlb->flags & MSG_PEEK) == 0) {
		NETLIBNOTIFY nln = { nlb, recvResult };
		NotifyFastHook(hRecvEvent, (WPARAM)&nln, (LPARAM)&nlc->nlu->user);
	}
	return recvResult;
}

static int ConnectionListToSocketList(HANDLE *hConns, fd_set *fd, int& pending)
{
	FD_ZERO(fd);
	for (int i = 0; hConns[i] && hConns[i] != INVALID_HANDLE_VALUE && i < FD_SETSIZE; i++) {
		NetlibConnection *nlcCheck = (NetlibConnection*)hConns[i];
		if (nlcCheck->handleType != NLH_CONNECTION && nlcCheck->handleType != NLH_BOUNDPORT) {
			SetLastError(ERROR_INVALID_DATA);
			return 0;
		}
		FD_SET(nlcCheck->s, fd);
		if (si.pending(nlcCheck->hSsl))
			pending++;
	}
	return 1;
}

INT_PTR NetlibSelect(WPARAM, LPARAM lParam)
{
	NETLIBSELECT *nls = (NETLIBSELECT*)lParam;
	if (nls == NULL || nls->cbSize != sizeof(NETLIBSELECT)) {
		SetLastError(ERROR_INVALID_PARAMETER);
		return SOCKET_ERROR;
	}

	TIMEVAL tv;
	tv.tv_sec = nls->dwTimeout/1000;
	tv.tv_usec = (nls->dwTimeout%1000)*1000;

	int pending = 0;
	fd_set readfd, writefd, exceptfd;
	WaitForSingleObject(hConnectionHeaderMutex, INFINITE);
	if (!ConnectionListToSocketList(nls->hReadConns, &readfd, pending)
		 || !ConnectionListToSocketList(nls->hWriteConns, &writefd, pending)
		 || !ConnectionListToSocketList(nls->hExceptConns, &exceptfd, pending))
	{
		ReleaseMutex(hConnectionHeaderMutex);
		return SOCKET_ERROR;
	}
	ReleaseMutex(hConnectionHeaderMutex);
	if (pending)
		return 1;

	return select(0, &readfd, &writefd, &exceptfd, nls->dwTimeout == INFINITE ? NULL : &tv);
}

INT_PTR NetlibSelectEx(WPARAM, LPARAM lParam)
{
	NETLIBSELECTEX *nls = (NETLIBSELECTEX*)lParam;
	if (nls == NULL || nls->cbSize != sizeof(NETLIBSELECTEX)) {
		SetLastError(ERROR_INVALID_PARAMETER);
		return SOCKET_ERROR;
	}

	TIMEVAL tv;
	tv.tv_sec = nls->dwTimeout / 1000;
	tv.tv_usec = (nls->dwTimeout % 1000) * 1000;
	WaitForSingleObject(hConnectionHeaderMutex, INFINITE);

	int pending = 0;
	fd_set readfd, writefd, exceptfd;
	if (!ConnectionListToSocketList(nls->hReadConns, &readfd, pending)
		|| !ConnectionListToSocketList(nls->hWriteConns, &writefd, pending)
		|| !ConnectionListToSocketList(nls->hExceptConns, &exceptfd, pending))
	{
		ReleaseMutex(hConnectionHeaderMutex);
		return SOCKET_ERROR;
	}
	ReleaseMutex(hConnectionHeaderMutex);

	int rc = (pending) ? pending : select(0, &readfd, &writefd, &exceptfd, nls->dwTimeout == INFINITE ? NULL : &tv);

	WaitForSingleObject(hConnectionHeaderMutex, INFINITE);
	/* go thru each passed HCONN array and grab its socket handle, then give it to FD_ISSET()
	to see if an event happened for that socket, if it has it will be returned as TRUE (otherwise not)
	This happens for read/write/except */
	NetlibConnection *conn = NULL;
	int j;
	for (j = 0; j < FD_SETSIZE; j++) {
		conn = (NetlibConnection*)nls->hReadConns[j];
		if (conn == NULL || conn == INVALID_HANDLE_VALUE) break;

		if (si.pending(conn->hSsl))
			nls->hReadStatus[j] = TRUE;
		if (conn->usingHttpGateway && conn->nlhpi.szHttpGetUrl == NULL && conn->dataBuffer == NULL)
			nls->hReadStatus[j] = (conn->pHttpProxyPacketQueue != NULL);
		else
			nls->hReadStatus[j] = FD_ISSET(conn->s, &readfd);
	}
	for (j = 0; j < FD_SETSIZE; j++) {
		conn = (NetlibConnection*)nls->hWriteConns[j];
		if (conn == NULL || conn == INVALID_HANDLE_VALUE) break;
		nls->hWriteStatus[j] = FD_ISSET(conn->s, &writefd);
	}
	for (j = 0; j < FD_SETSIZE; j++) {
		conn = (NetlibConnection*)nls->hExceptConns[j];
		if (conn == NULL || conn == INVALID_HANDLE_VALUE) break;
		nls->hExceptStatus[j] = FD_ISSET(conn->s, &exceptfd);
	}
	ReleaseMutex(hConnectionHeaderMutex);
	return rc;
}

bool NetlibStringToAddress(const char* str, SOCKADDR_INET_M* addr)
{
	if (!str) return false;

	int len = sizeof(SOCKADDR_INET_M);
	return !WSAStringToAddressA((char*)str, AF_INET6, NULL, (PSOCKADDR)addr, &len);
}

char* NetlibAddressToString(SOCKADDR_INET_M* addr)
{
	char saddr[128];
	DWORD len = sizeof(saddr);
	if (!WSAAddressToStringA((PSOCKADDR)addr, sizeof(*addr), NULL, saddr, &len))
		return mir_strdup(saddr);

	if (addr->si_family == AF_INET) {
		char *szIp = inet_ntoa(addr->Ipv4.sin_addr);
		if (addr->Ipv4.sin_port != 0) {
			mir_snprintf(saddr, SIZEOF(saddr), "%s:%d", szIp, htons(addr->Ipv4.sin_port));
			return mir_strdup(saddr);
		}
		return mir_strdup(szIp);
	}
	return NULL;
}

void NetlibGetConnectionInfo(NetlibConnection* nlc, NETLIBCONNINFO *connInfo)
{
	if (!nlc || !connInfo || connInfo->cbSize < sizeof(NETLIBCONNINFO)) return;

	SOCKADDR_INET_M sin = { 0 };
	int len = sizeof(sin);
	if (!getsockname(nlc->s, (PSOCKADDR)&sin, &len)) {
		connInfo->wPort = ntohs(sin.Ipv4.sin_port);
		connInfo->dwIpv4 = sin.si_family == AF_INET ? htonl(sin.Ipv4.sin_addr.s_addr) : 0;

		char *szTmp = NetlibAddressToString(&sin);
		mir_strncpy(connInfo->szIpPort, szTmp, sizeof(connInfo->szIpPort));
		connInfo->szIpPort[sizeof(connInfo->szIpPort) - 1] = 0;
		mir_free(szTmp);
	}
}

inline bool IsAddrGlobal(const IN6_ADDR *a)
{
	unsigned char High = a->s6_bytes[0] & 0xf0;
	return High != 0 && High != 0xf0;
}

static NETLIBIPLIST* GetMyIpv6(unsigned flags)
{
	addrinfo *air = NULL, *ai, hints = { 0 };
	const char *szMyHost = "";

	hints.ai_family = AF_UNSPEC;
	hints.ai_flags = AI_PASSIVE;

	if (GetAddrInfoA(szMyHost, NULL, &hints, &air))
		return NULL;

	unsigned n = 0;
	for (ai = air; ai; ai = ai->ai_next) {
		SOCKADDR_INET_M *iaddr = (SOCKADDR_INET_M*)ai->ai_addr;
		if (ai->ai_family == AF_INET || (ai->ai_family == AF_INET6 && (!(flags & 1) || IsAddrGlobal(&iaddr->Ipv6.sin6_addr))))
			++n;
	}

	NETLIBIPLIST *addr = (NETLIBIPLIST*)mir_calloc(n * 64 + 4);
	addr->cbNum = n;

	unsigned i = 0;
	for (ai = air; ai; ai = ai->ai_next) {
		SOCKADDR_INET_M *iaddr = (SOCKADDR_INET_M*)ai->ai_addr;
		if (ai->ai_family == AF_INET ||
			(ai->ai_family == AF_INET6 &&
			(!(flags & 1) || IsAddrGlobal(&iaddr->Ipv6.sin6_addr))))
		{
			char *szIp = NetlibAddressToString(iaddr);
			if (szIp)
				strncpy_s(addr->szIp[i++], szIp, _TRUNCATE);
			mir_free(szIp);
		}
	}
	FreeAddrInfoA(air);
	return addr;
}

static NETLIBIPLIST* GetMyIpv4(void)
{
	char hostname[256] = "";

	gethostname(hostname, sizeof(hostname));
	PHOSTENT he = gethostbyname(hostname);

	unsigned n;
	for (n = 0; he->h_addr_list[n]; ++n)
		;

	NETLIBIPLIST *addr = (NETLIBIPLIST*)mir_calloc(n * 64 + 4);
	addr->cbNum = n;

	for (unsigned i = 0; i < n; i++)
		strncpy_s(addr->szIp[i], inet_ntoa(*(PIN_ADDR)he->h_addr_list[i]), _TRUNCATE);

	return addr;
}

NETLIBIPLIST* GetMyIp(unsigned flags)
{
	return GetMyIpv6(flags);
}