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linbpq/PortMapper.c

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/*
Copyright 2001-2022 John Wiseman G8BPQ
This file is part of LinBPQ/BPQ32.
LinBPQ/BPQ32 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 3 of the License, or
(at your option) any later version.
LinBPQ/BPQ32 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 LinBPQ/BPQ32. If not, see http://www.gnu.org/licenses
*/
// Module to provide a basic Gateway between IP over AX.25 and the Internet.
// Uses WinPcap on Windows, TAP Driver on Linux
// Basically operates as a mac level bridge, with headers converted between ax.25 and Ethernet.
// ARP frames are also reformatted, and monitored to build a simple routing table.
// Apps may not use ARP (MSYS is configured with an ax.25 default route, rather than an IP one),
// so the default route must be configured.
// Intended as a gateway for legacy apps, rather than a full function ip over ax.25 router.
// Suggested config is to use the Internet Ethernet Adapter, behind a NAT/PAT Router.
// The ax.25 applications will appear as single addresses on the Ethernet LAN
// The code can also switch packets between ax.25 interfaces
// First Version, July 2008
// Version 1.2.1 January 2009
// Add IP Address Mapping option
// June 2014. Convert to Router instead of MAC Bridge, and include a RIP44 decoder
// so packets can be routed from RF to/from encapsulated 44 net subnets.
// Routes may also be learned from received RF packets, or added from config file
/*
TODo ?Multiple Adapters
*/
// ip tuntap add dev bpqtap mode tap
// ifconfig bpqtap 44.131.4.19 mtu 256 up
#pragma data_seg("_BPQDATA")
#define _CRT_SECURE_NO_DEPRECATE
#include <stdio.h>
#include <time.h>
#include "CHeaders.h"
#include "ipcode.h"
#ifdef WIN32
#include "pcap.h"
#endif
#ifndef LINBPQ
#include "kernelresource.h"
LRESULT CALLBACK ResWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
#endif
//#define s_addr S_un.S_addr
extern BPQVECSTRUC * IPHOSTVECTORPTR;
BOOL APIENTRY Send_AX(PMESSAGE Block, DWORD Len, UCHAR Port);
VOID SENDSABM(struct _LINKTABLE * LINK);
BOOL FindLink(UCHAR * LinkCall, UCHAR * OurCall, int Port, struct _LINKTABLE ** REQLINK);
BOOL ProcessConfig();
VOID RemoveARP(PARPDATA Arp);
VOID ProcessTunnelMsg(PIPMSG IPptr);
VOID ProcessRIP44Message(PIPMSG IPptr);
PROUTEENTRY LookupRoute(uint32_t IPADDR, uint32_t Mask, BOOL Add, BOOL * Found);
BOOL ProcessROUTELine(char * buf, BOOL Locked);
VOID DoRouteTimer();
PROUTEENTRY FindRoute(uint32_t IPADDR);
VOID SendIPtoEncap(PIPMSG IPptr, uint32_t Encap);
USHORT Generate_CHECKSUM(VOID * ptr1, int Len);
static VOID MapRouteIPMsg(PIPMSG IPptr);
BOOL Check_Checksum(VOID * ptr1, int Len);
static BOOL Send_ETH(VOID * Block, DWORD len);
VOID ProcessEthARPMsg(PETHARP arpptr);
static VOID SendARPMsg(PARPDATA Arp);
VOID SendICMPTimeExceeded(PIPMSG IPptr);
#define ARPTIMEOUT 3600
// ARP REQUEST/REPLY (Eth)
static ETHARP ETHARPREQMSG = {0};
static ARPDATA ** ARPRecords = NULL; // ARP Table - malloc'ed as needed
static int NumberofARPEntries = 0;
static ROUTEENTRY ** RouteRecords = NULL;
static int NumberofRoutes = 0;
//HANDLE hBPQNET = INVALID_HANDLE_VALUE;
static uint32_t OurIPAddr = 0;
static uint32_t OurIPBroadcast = 0;
static uint32_t OurNetMask = 0xffffffff;
static BOOL WantTAP = FALSE;
static BOOL WantEncap = 0; // Run RIP44 and Net44 Encap
static int IPTTL = 128;
static int FramesForwarded = 0;
static int FramesDropped = 0;
static int ARPTimeouts = 0;
static int SecTimer = 10;
static BOOL NeedResolver = FALSE;
static HMENU hMenu;
extern HMENU hWndMenu;
static HMENU hPopMenu;
extern HKEY REGTREE;
extern int OffsetH, OffsetW;
extern HMENU hMainFrameMenu, hBaseMenu;
extern HWND ClientWnd, FrameWnd;
static int map_table_len = 0;
//int index=0; // pointer for table search
static int ResolveIndex=-1; // pointer to entry being resolved
static struct map_table_entry map_table[MAX_ENTRIES];
static int Windowlength, WindowParam;
static time_t ltime,lasttime;
static char ConfigClassName[]="CONFIG";
HWND hIPResWnd = 0;
BOOL IPMinimized;
extern char * PortConfig[];
static int baseline=0;
static unsigned char hostaddr[64];
// Following two fields used by stats to get round shared memmory problem
static ARPDATA Arp={0};
static int ARPFlag = -1;
// Following Buffer is used for msgs from WinPcap. Put the Enet message part way down the buffer,
// so there is room for ax.25 header instead of Enet header when we route the frame to ax.25
// Enet Header ia 14 bytes, AX.25 UI is 16
// Also used to reassemble NOS Fragmented ax.25 packets
static UCHAR Buffer[4096] = {0};
#define EthOffset 30 // Should be plenty
static DWORD IPLen = 0;
#ifdef WIN32
static UCHAR ourMACAddr[6] = {02,'B','P','Q',3,48};
#else
UCHAR ourMACAddr[6] = {02,'B','P','Q',0,1};
#endif
static LONG DefaultIPAddr = 0;
static IPSTATS IPStats = {0};
static UCHAR BPQDirectory[260];
static char ARPFN[MAX_PATH];
static HANDLE handle;
#ifdef WIN32
static pcap_t *adhandle = 0;
static pcap_t * (FAR * pcap_open_livex)(const char *, int, int, int, char *);
static int pcap_reopen_delay;
#endif
static char Adapter[256];
static int Promiscuous = 1; // Default to Promiscuous
#ifdef WIN32
static HINSTANCE PcapDriver=0;
typedef int (FAR *FARPROCX)();
static int (FAR * pcap_sendpacketx)();
static FARPROCX pcap_compilex;
static FARPROCX pcap_setfilterx;
static FARPROCX pcap_datalinkx;
static FARPROCX pcap_next_exx;
static FARPROCX pcap_geterrx;
static char Dllname[6]="wpcap";
FARPROCX GetAddress(char * Proc);
#else
#define pcap_compilex pcap_compile
#define pcap_open_livex pcap_open_live
#define pcap_setfilterx pcap_setfilter
#define pcap_datalinkx pcap_datalink
#define pcap_next_exx pcap_next_ex
#define pcap_geterrx pcap_geterr
#define pcap_sendpacketx pcap_sendpacket
#endif
VOID __cdecl Debugprintf(const char * format, ...);
static HANDLE hInstance;
void OpenTAP();
Dll BOOL APIENTRY Init_PM()
{
ARPDATA * ARPptr;
if (hIPResWnd)
{
PostMessage(hIPResWnd, WM_CLOSE,0,0);
// DestroyWindow(hIPResWnd);
Debugprintf("IP Init Destroying IP Resolver");
}
hIPResWnd= NULL;
ARPRecords = NULL; // ARP Table - malloc'ed as needed
NumberofARPEntries=0;
RouteRecords = NULL;
NumberofRoutes = 0;
ReadConfigFile();
// Clear old packets
memset(ETHARPREQMSG.MSGHDDR.DEST, 255, 6);
memcpy(ETHARPREQMSG.MSGHDDR.SOURCE, ourMACAddr, 6);
ETHARPREQMSG.MSGHDDR.ETYPE = 0x0608; // ARP
ETHARPREQMSG.HWTYPE=0x0100; // Eth
ETHARPREQMSG.PID=0x0008;
ETHARPREQMSG.HWADDRLEN = 6;
ETHARPREQMSG.IPADDRLEN = 4;
#ifdef WIN32
//
// Open PCAP Driver
if (Adapter[0]) // Don't have to have ethernet, if used just as ip over ax.25 switch
{
char buf[80];
if (OpenPCAP())
sprintf(buf,"Portmapper Using %s\n", Adapter);
else
sprintf(buf," Portmapper Unable to open %s\n", Adapter);
WritetoConsoleLocal(buf);
if (adhandle == NULL)
{
WritetoConsoleLocal("Failed to open pcap device - Portmapper Disabled\n");
return FALSE;
}
// Allocate ARP Entry for Default Gateway, and send ARP for it
if (DefaultIPAddr)
{
ARPptr = AllocARPEntry();
if (ARPptr != NULL)
{
ARPptr->ARPINTERFACE = 255;
ARPptr->ARPTYPE = 'E';
ARPptr->IPADDR = DefaultIPAddr;
ARPptr->LOCKED = TRUE;
SendARPMsg(ARPptr);
}
}
}
#else
// Linux - if TAP requested, open it
#ifndef MACBPQ
if (WantTAP)
OpenTAP();
#endif
#endif
#ifndef LINBPQ
if (NeedResolver)
{
WNDCLASS wc;
int i;
char WindowTitle[100];
int retCode, Type, Vallen;
HKEY hKey;
char Size[80];
RECT Rect = {0,0,0,0};
retCode = RegOpenKeyEx (REGTREE, "SOFTWARE\\G8BPQ\\BPQ32", 0, KEY_QUERY_VALUE, &hKey);
if (retCode == ERROR_SUCCESS)
{
Vallen=80;
retCode = RegQueryValueEx(hKey,"IPResSize",0,
(uint32_t *)&Type,(UCHAR *)&Size,(uint32_t *)&Vallen);
if (retCode == ERROR_SUCCESS)
sscanf(Size,"%d,%d,%d,%d,%d",&Rect.left,&Rect.right,&Rect.top,&Rect.bottom, &IPMinimized);
if (Rect.top < - 500 || Rect.left < - 500)
{
Rect.left = 0;
Rect.top = 0;
Rect.right = 600;
Rect.bottom = 400;
}
RegCloseKey(hKey);
}
// Fill in window class structure with parameters that describe
// the main window.
wc.style = CS_HREDRAW | CS_VREDRAW | CS_NOCLOSE;
wc.lpfnWndProc = (WNDPROC)ResWndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon (hInstance, MAKEINTRESOURCE(BPQICON));
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wc.lpszMenuName = NULL ;
wc.lpszClassName = "IPAppName";
// Register the window classes
RegisterClass(&wc);
i=GetLastError();
Windowlength=(map_table_len)*14+100;
WindowParam=WS_OVERLAPPEDWINDOW | WS_VSCROLL;
sprintf(WindowTitle,"PortM Resolver");
hIPResWnd = CreateMDIWindow("IPAppName", WindowTitle, WindowParam,
Rect.left - (OffsetW /2), Rect.top - OffsetH, Rect.right - Rect.left, Rect.bottom - Rect.top,
ClientWnd, hInstance, 1234);
hPopMenu = CreatePopupMenu();
AppendMenu(hPopMenu, MF_STRING, BPQREREAD, "ReRead Config");
SetScrollRange(hIPResWnd,SB_VERT,0, map_table_len,TRUE);
if (IPMinimized)
ShowWindow(hIPResWnd, SW_SHOWMINIMIZED);
else
ShowWindow(hIPResWnd, SW_RESTORE);
_beginthread(IPResolveNames, 0, NULL );
}
#endif
WritetoConsoleLocal("Portmapper Enabled\n");
return TRUE;
}
VOID PMClose()
{
}
union
{
struct sockaddr_in rxaddr;
struct sockaddr_in6 rxaddr6;
} RXaddr;
Dll BOOL APIENTRY Poll_PM()
{
int res;
struct pcap_pkthdr *header;
const u_char *pkt_data;
// Entered every 100 mS
// if ARPFlag set, copy requested ARP record (For BPQStatus GUI)
if (ARPFlag != -1)
{
memcpy(&Arp, ARPRecords[ARPFlag], sizeof (ARPDATA));
ARPFlag = -1;
}
SecTimer--;
if (SecTimer == 0)
{
SecTimer = 10;
DoARPTimer();
DoRouteTimer();
}
Pollloop:
#ifdef WIN32
if (adhandle)
{
res = pcap_next_exx(adhandle, &header, &pkt_data);
if (res > 0)
{
PETHMSG ethptr = (PETHMSG)&Buffer[EthOffset];
if (header->len > 1514)
{
// Debugprintf("Ether Packet Len = %d", header->len);
goto Pollloop;
}
memcpy(&Buffer[EthOffset],pkt_data, header->len);
if (ethptr->ETYPE == 0x0008)
{
ProcessEthIPMsg((PETHMSG)&Buffer[EthOffset]);
// PIPMSG ipptr = (PIPMSG)&Buffer[EthOffset+14];
// ProcessIPMsg(ipptr, ethptr->SOURCE, 'E', 255);
goto Pollloop;
}
if (ethptr->ETYPE == 0x0608)
{
ProcessEthARPMsg((PETHARP)ethptr);
goto Pollloop;
}
// Ignore anything else
goto Pollloop;
}
else
{
if (res < 0)
{
char * error = (char *)pcap_geterrx(adhandle) ;
Debugprintf(error);
if (OpenPCAP() == FALSE)
pcap_reopen_delay = 300;
}
}
}
else
{
// No handle.
if (Adapter[0]) // Don't have to have ethernet, if used just as ip over ax.25 switch
{
// Try reopening periodically
pcap_reopen_delay --;
if (pcap_reopen_delay < 0)
if (OpenPCAP() == FALSE)
pcap_reopen_delay = 300; // Retry every 30 seconds
}
}
#endif
return TRUE;
}
static BOOL Send_ETH(VOID * Block, DWORD len)
{
#ifdef WIN32
if (adhandle)
{
// if (len < 60) len = 60;
// Send down the packet
pcap_sendpacketx(adhandle, // Adapter
Block, // buffer with the packet
len); // size
}
#endif
return TRUE;
}
static VOID SendIPtoBPQDEV(PIPMSG IPptr, UCHAR * HWADDR)
{
// AX.25 headers are bigger, so there will always be room in buffer for enet header
PETHMSG Ethptr = (PETHMSG)IPptr;
int Len;
(UCHAR *)Ethptr--;
Len = ntohs(IPptr->IPLENGTH);
Len+=14; // Add eth Header
memcpy(Ethptr->DEST, HWADDR, 6);
memcpy(Ethptr->SOURCE, ourMACAddr, 6);
Ethptr->ETYPE= 0x0008;
Send_ETH(Ethptr,Len);
return;
}
static VOID ProcessEthIPMsg(PETHMSG Buffer)
{
PIPMSG ipptr = (PIPMSG)&Buffer[1];
if (memcmp(Buffer, ourMACAddr,6 ) != 0)
return; // Not for us
if (memcmp(&Buffer[6], ourMACAddr,6 ) == 0)
return; // Discard our sends
// if Checkum offload is active we get the packet before the NIC sees it (from PCAP)
if (ipptr->IPCHECKSUM == 0) // Windows seems to do this
{
// Generate IP and TCP/UDP checksums
int Len = ntohs(ipptr->IPLENGTH);
Len-=20;
ipptr->IPCHECKSUM = Generate_CHECKSUM(ipptr, 20);
if (ipptr->IPPROTOCOL == 6) // TCP
{
PTCPMSG TCP = (PTCPMSG)&ipptr->Data;
PHEADER PH = {0};
PH.IPPROTOCOL = 6;
PH.LENGTH = htons(Len);
memcpy(&PH.IPSOURCE, &ipptr->IPSOURCE, 4);
memcpy(&PH.IPDEST, &ipptr->IPDEST, 4);
TCP->CHECKSUM = ~Generate_CHECKSUM(&PH, 12);
TCP->CHECKSUM = Generate_CHECKSUM(TCP, Len);
}
}
ProcessIPMsg(ipptr, Buffer->SOURCE, 'E', 255);
}
static VOID ProcessEthARPMsg(PETHARP arpptr)
{
int i=0;
PARPDATA Arp;
BOOL Found;
if (memcmp(&arpptr->MSGHDDR.SOURCE, ourMACAddr,6 ) == 0 )
return; // Discard our sends
switch (arpptr->ARPOPCODE)
{
case 0x0100:
// We should only accept requests from our subnet - we might have more than one net on iterface
if ((arpptr->SENDIPADDR & OurNetMask) != (OurIPAddr & OurNetMask))
return;
if (arpptr->TARGETIPADDR == 0) // Request for 0.0.0.0
return;
// Add to our table, as we will almost certainly want to send back to it
Arp = LookupARP(arpptr->SENDIPADDR, TRUE, &Found);
if (Found)
goto AlreadyThere; // Already there
if (Arp == NULL) return; // No point of table full
Arp->IPADDR = arpptr->SENDIPADDR;
Arp->ARPTYPE = 'E';
Arp->ARPINTERFACE = 255;
Arp->ARPTIMER = ARPTIMEOUT;
SaveARP();
AlreadyThere:
memcpy(Arp->HWADDR, arpptr->SENDHWADDR ,6);
Arp->ARPVALID = TRUE;
if (arpptr->TARGETIPADDR == OurIPAddr)
{
uint32_t Save = arpptr->TARGETIPADDR;
arpptr->ARPOPCODE = 0x0200;
memcpy(arpptr->TARGETHWADDR, arpptr->SENDHWADDR ,6);
memcpy(arpptr->SENDHWADDR, ourMACAddr ,6);
arpptr->TARGETIPADDR = arpptr->SENDIPADDR;
arpptr->SENDIPADDR = Save;
memcpy(arpptr->MSGHDDR.DEST, arpptr->MSGHDDR.SOURCE ,6);
memcpy(arpptr->MSGHDDR.SOURCE, ourMACAddr ,6);
Send_ETH(arpptr,42);
return;
}
break;
case 0x0200:
if (memcmp(&arpptr->MSGHDDR.DEST, ourMACAddr,6 ) != 0 )
return; // Not for us
// Update ARP Cache
Arp = LookupARP(arpptr->SENDIPADDR, TRUE, &Found);
if (Found)
goto Update;
if (Arp == NULL)
goto SendBack;
Update:
Arp->IPADDR = arpptr->SENDIPADDR;
memcpy(Arp->HWADDR, arpptr->SENDHWADDR ,6);
Arp->ARPTYPE = 'E';
Arp->ARPINTERFACE = 255;
Arp->ARPVALID = TRUE;
Arp->ARPTIMER = ARPTIMEOUT;
SaveARP();
SendBack:
// Send Back to Originator of ARP Request
if (arpptr->TARGETIPADDR == OurIPAddr) // Reply to our request?
break;
default:
break;
}
return;
}
static int CheckSumAndSend(PIPMSG IPptr, PTCPMSG TCPmsg, USHORT Len)
{
struct _IPMSG PH = {0};
IPptr->IPCHECKSUM = 0;
PH.IPPROTOCOL = 6;
PH.IPLENGTH = htons(Len);
memcpy(&PH.IPSOURCE, &IPptr->IPSOURCE, 4);
memcpy(&PH.IPDEST, &IPptr->IPDEST, 4);
TCPmsg->CHECKSUM = ~Generate_CHECKSUM(&PH, 20);
TCPmsg->CHECKSUM = Generate_CHECKSUM(TCPmsg, Len);
// No need to do IP checksum as RouteIPMessage doesit
// CHECKSUM IT
// IPptr->IPCHECKSUM = Generate_CHECKSUM(IPptr, 20);
MapRouteIPMsg(IPptr);
return 0;
}
static VOID ProcessIPMsg(PIPMSG IPptr, UCHAR * MACADDR, char Type, UCHAR Port)
{
uint32_t Dest;
PARPDATA Arp;
BOOL Found;
int index, Len;
PTCPMSG TCPptr;
PUDPMSG UDPptr;
if (IPptr->VERLEN != 0x45) return; // Only support Type = 4, Len = 20
if (!CheckIPChecksum(IPptr)) return;
// Make sure origin ia in ARP Table
Arp = LookupARP(IPptr->IPSOURCE.addr, TRUE, &Found);
if (!Found)
{
// Add if possible
if (Arp != NULL)
{
Arp->IPADDR = IPptr->IPSOURCE.addr;
if (Type == 'E')
{
memcpy(Arp->HWADDR, MACADDR, 6);
}
else
{
memcpy(Arp->HWADDR, MACADDR, 7);
Arp->HWADDR[6] &= 0x7e;
}
Arp->ARPTYPE = Type;
Arp->ARPINTERFACE = Port;
Arp->ARPVALID = TRUE;
Arp->ARPTIMER = ARPTIMEOUT;
SaveARP();
}
}
else
Arp->ARPTIMER = ARPTIMEOUT; // Refresh
// See if for us - if not pass to router
Dest = IPptr->IPDEST.addr;
if (Dest == OurIPAddr || Dest == 0xffffffff || Dest == OurIPBroadcast)
goto ForUs;
return;
ForUs:
// if (IPptr->IPPROTOCOL == 4) // AMPRNET Tunnelled Packet
// {
// ProcessTunnelMsg(IPptr);
// return;
// }
if (IPptr->IPPROTOCOL == 1) // ICMP
{
ProcessICMPMsg(IPptr);
return;
}
// Support UDP for SNMP
if (IPptr->IPPROTOCOL == 17) // UDP
{
UDPptr = (PUDPMSG)&IPptr->Data;
if (UDPptr->DESTPORT == htons(161))
{
ProcessSNMPMessage(IPptr);
return;
}
}
// See if for a mapped Address
if (IPptr->IPPROTOCOL != 6) return; // Only TCP
TCPptr = (PTCPMSG)&IPptr->Data;
Len = ntohs(IPptr->IPLENGTH);
Len-=20;
for (index=0; index < map_table_len; index++)
{
if ((map_table[index].sourceport == TCPptr->DESTPORT) &&
map_table[index].sourceipaddr == IPptr->IPSOURCE.addr)
{
// Outgoing Message - replace Dest IP address and Port. Source Port remains unchanged
IPptr->IPSOURCE.addr = OurIPAddr;
IPptr->IPDEST.addr = map_table[index].mappedipaddr;
TCPptr->DESTPORT = map_table[index].mappedport;
CheckSumAndSend(IPptr, TCPptr, Len);
return;
}
if ((map_table[index].mappedport == TCPptr->SOURCEPORT) &&
map_table[index].mappedipaddr == IPptr->IPSOURCE.addr)
{
// Incomming Message - replace Dest IP address and Source Port
IPptr->IPSOURCE.addr = OurIPAddr;
IPptr->IPDEST.addr = map_table[index].sourceipaddr;
TCPptr->SOURCEPORT = map_table[index].sourceport;
CheckSumAndSend(IPptr, TCPptr, Len);
return;
}
}
}
static VOID ProcessICMPMsg(PIPMSG IPptr)
{
int Len;
PICMPMSG ICMPptr = (PICMPMSG)&IPptr->Data;
Len = ntohs(IPptr->IPLENGTH);
Len-=20;
Check_Checksum(ICMPptr, Len);
if (ICMPptr->ICMPTYPE == 8)
{
// ICMP_ECHO
ICMPptr->ICMPTYPE = 0; // Convert to Reply
// CHECKSUM IT
ICMPptr->ICMPCHECKSUM = 0;
ICMPptr->ICMPCHECKSUM = Generate_CHECKSUM(ICMPptr, Len);
// Swap Dest to Origin
IPptr->IPDEST = IPptr->IPSOURCE;
IPptr->IPSOURCE.addr = OurIPAddr;
IPptr->IPTTL = IPTTL;
// IPptr->IPCHECKSUM = 0;
// IPptr->IPCHECKSUM = Generate_CHECKSUM(IPptr, 20); // RouteIPMsg redoes checksum
MapRouteIPMsg(IPptr); // Send Back
}
if (ICMPptr->ICMPTYPE == 0)
{
// ICMP_REPLY:
// I don't see how Portmapper should be getting ping responses
/*
UCHAR * BUFFER = GetBuff();
UCHAR * ptr1;
struct _MESSAGE * Msg;
TRANSPORTENTRY * Session = L4TABLE;
char IP[20];
unsigned char work[4];
Session += ICMPptr->ICMPID;
if (BUFFER == NULL)
return;
ptr1 = &BUFFER[7];
memcpy(work, &IPptr->IPSOURCE, 4);
sprintf(IP, "%d.%d.%d.%d", work[0], work[1], work[2], work[3]);
*ptr1++ = 0xf0; // PID
ptr1 += sprintf(ptr1, "Ping Response from %s", IP);
*ptr1++ = 0x0d; // CR
Len = ptr1 - BUFFER;
Msg = (struct _MESSAGE *)BUFFER;
Msg->LENGTH = Len;
Msg->CHAIN = NULL;
C_Q_ADD(&Session->L4TX_Q, (UINT *)BUFFER);
PostDataAvailable(Session);
*/
return;
}
}
static VOID SendICMPMessage(PIPMSG IPptr, int Type, int Code, int P2)
{
PICMPMSG ICMPptr = (PICMPMSG)&IPptr->Data;
UCHAR * ptr;
if (OurIPAddr == 0)
return; // Can't do much without one
if (IPptr->IPPROTOCOL == ICMP && ICMPptr->ICMPTYPE == 11)
return; // Don't send Time Exceeded for TimeExceded
// Copy the Original IP Header and first 8 bytes of packet down the buffer
ptr = (UCHAR *) ICMPptr;
memmove(ptr + 8, IPptr, 28); // IP header plus 8 data
// We swap Souce to Dest, Convert to ICMP 11 and send back first 8 bytes of packet after header
IPptr->IPDEST = IPptr->IPSOURCE;
IPptr->IPSOURCE.addr = OurIPAddr;
IPptr->IPPROTOCOL = ICMP;
IPptr->IPTTL = IPTTL;
IPptr->FRAGWORD = 0;
IPptr->IPLENGTH = htons(56); // IP Header ICMP Header IP Header 8 Data
memset (ICMPptr, 0, 8);
ICMPptr->ICMPTYPE = Type;
ICMPptr->ICMPCODE = Code;
ICMPptr->ICMPSEQUENCE = htons(P2);
ICMPptr->ICMPCHECKSUM = Generate_CHECKSUM(ICMPptr, 36);
MapRouteIPMsg(IPptr);
}
static VOID MapRouteIPMsg(PIPMSG IPptr)
{
PARPDATA Arp;
BOOL Found;
// We rely on the ARP messages generated by either end to route frames.
// If address is not in ARP cache (say call originated by MSYS), send to our default route
// Decremnent TTL and Recalculate header checksum
IPptr->IPTTL--;
if (IPptr->IPTTL == 0)
{
SendICMPTimeExceeded(IPptr);
return; // Should we send time exceeded????
}
IPptr->IPCHECKSUM = 0;
IPptr->IPCHECKSUM = Generate_CHECKSUM(IPptr, 20);
// Look up ARP
Arp = LookupARP(IPptr->IPDEST.addr, FALSE, &Found);
// If enabled, look in Net44 Encap Routes
if (!Found && DefaultIPAddr)
Arp = LookupARP(DefaultIPAddr, FALSE, &Found);
if (!Found)
return; // No route or default
if (Arp == NULL)
return; // Should we try to ARP it?
if (Arp->ARPVALID)
{
SendIPtoBPQDEV(IPptr, Arp->HWADDR);
}
return;
}
static PROUTEENTRY AllocRouteEntry()
{
PROUTEENTRY Routeptr;
if (NumberofRoutes == 0)
RouteRecords = malloc(sizeof(void *));
else
RouteRecords = realloc(RouteRecords,(NumberofRoutes + 1) * sizeof(void *));
Routeptr = zalloc(sizeof(ROUTEENTRY));
if (Routeptr == NULL) return NULL;
RouteRecords[NumberofRoutes++] = Routeptr;
return Routeptr;
}
static PARPDATA AllocARPEntry()
{
ARPDATA * ARPptr;
if (NumberofARPEntries == 0)
ARPRecords = malloc(sizeof(void *));
else
ARPRecords = realloc(ARPRecords, (NumberofARPEntries+1)*sizeof(void *));
ARPptr = malloc(sizeof(ARPDATA));
if (ARPptr == NULL) return NULL;
memset(ARPptr, 0, sizeof(ARPDATA));
ARPRecords[NumberofARPEntries++] = ARPptr;
return ARPptr;
}
static VOID SendARPMsg(PARPDATA Arp)
{
// Send ARP. Initially used only to find default gateway
Arp->ARPTIMER = 5; // Retry periodically
ETHARPREQMSG.ARPOPCODE = 0x0100; // ; REQUEST
ETHARPREQMSG.TARGETIPADDR = Arp->IPADDR;
memset(ETHARPREQMSG.TARGETHWADDR, 0, 6);
ETHARPREQMSG.SENDIPADDR = OurIPAddr;
memcpy(ETHARPREQMSG.SENDHWADDR,ourMACAddr, 6);
memcpy(ETHARPREQMSG.MSGHDDR.SOURCE, ourMACAddr, 6);
memset(ETHARPREQMSG.MSGHDDR.DEST, 255, 6);
Send_ETH(&ETHARPREQMSG, 42);
return;
}
static PROUTEENTRY FindRoute(uint32_t IPADDR)
{
PROUTEENTRY Route = NULL;
int i;
for (i = 0; i < NumberofRoutes; i++)
{
Route = RouteRecords[i];
if ((IPADDR & Route->SUBNET) == Route->NETWORK)
return Route;
}
return NULL;
}
static PROUTEENTRY LookupRoute(uint32_t IPADDR, uint32_t Mask, BOOL Add, BOOL * Found)
{
PROUTEENTRY Route = NULL;
int i;
for (i = 0; i < NumberofRoutes; i++)
{
Route = RouteRecords[i];
if (Route->NETWORK == IPADDR && Route->SUBNET == Mask)
{
*Found = TRUE;
return Route;
}
}
// Not Found
*Found = FALSE;
if (Add)
{
Route = AllocRouteEntry();
return Route;
}
else
return NULL;
}
static PARPDATA LookupARP(uint32_t IPADDR, BOOL Add, BOOL * Found)
{
PARPDATA Arp = NULL;
int i;
for (i=0; i < NumberofARPEntries; i++)
{
Arp = ARPRecords[i];
if (Arp->IPADDR == IPADDR)
{
*Found = TRUE;
return Arp;
}
}
// Not Found
*Found = FALSE;
if (Add)
{
Arp = AllocARPEntry();
return Arp;
}
else
return NULL;
}
static VOID RemoveARP(PARPDATA Arp);
static VOID RemoveRoute(PROUTEENTRY Route)
{
int i;
for (i=0; i < NumberofRoutes; i++)
{
if (Route == RouteRecords[i])
{
while (i < NumberofRoutes)
{
RouteRecords[i] = RouteRecords[i+1];
i++;
}
if (Route->ARP)
{
PARPDATA Arp = Route->ARP;
Route->ARP->ARPROUTE = NULL; // Avoid recursion
RemoveARP(Arp);
}
free(Route);
NumberofRoutes--;
return;
}
}
}
static VOID RemoveARP(PARPDATA Arp)
{
int i;
if (Arp->IPADDR == DefaultIPAddr)
{
// Dont remove Default Gateway. Set to re-resolve
Arp->ARPVALID = FALSE;
Arp->ARPTIMER = 5;
return;
}
for (i=0; i < NumberofARPEntries; i++)
{
if (Arp == ARPRecords[i])
{
while (i < NumberofARPEntries)
{
ARPRecords[i] = ARPRecords[i+1];
i++;
}
// Remove linked route
if (Arp->ARPROUTE)
{
PROUTEENTRY Route = Arp->ARPROUTE;
Arp->ARPROUTE->ARP = NULL; // Avoid recursion
RemoveRoute(Route);
}
free(Arp);
NumberofARPEntries--;
return;
}
}
}
static BOOL ReadConfigFile()
{
// IPAddr 192.168.0.129
// IPBroadcast 192.168.0.255
// IPGateway 192.168.0.1
// IPPorts 1,4
// MAP 192.168.0.100 1001 n9pmo.dyndns.org 1000
char * Config;
char * ptr1, * ptr2;
char buf[256],errbuf[256];
map_table_len = 0; // For reread
Config = PortConfig[35]; // Config fnom bpq32.cfg
if (Config)
{
// Using config from bpq32.cfg
ptr1 = Config;
ptr2 = strchr(ptr1, 13);
while(ptr2)
{
memcpy(buf, ptr1, ptr2 - ptr1);
buf[ptr2 - ptr1] = 0;
ptr1 = ptr2 + 2;
ptr2 = strchr(ptr1, 13);
strcpy(errbuf,buf); // save in case of error
if (!ProcessLine(buf))
{
WritetoConsoleLocal("PortMapper bad config record ");
strcat(errbuf, "\n");
WritetoConsoleLocal(errbuf);
}
}
}
return (TRUE);
}
static int ProcessLine(char * buf)
{
char * ptr, * p_value, * p_origport, * p_host, * p_port;
int port, mappedport, ipad;
ptr = strtok(buf, " \t\n\r");
p_value = strtok(NULL, " \t\n\r");
if(ptr == NULL) return (TRUE);
if(*ptr =='#') return (TRUE); // comment
if(*ptr ==';') return (TRUE); // comment
if(_stricmp(ptr,"ADAPTER") == 0)
{
#ifndef WIN32
WritetoConsoleLocal("IPGating to Ethernet is not supported in this build\n");
return TRUE;
#endif
strcpy(Adapter,p_value);
return (TRUE);
}
if(_stricmp(ptr,"promiscuous") == 0)
{
Promiscuous = atoi(p_value);
return (TRUE);
}
if (_stricmp(ptr,"IPAddr") == 0)
{
OurIPAddr = inet_addr(p_value);
if (OurIPAddr == INADDR_NONE) return (FALSE);
return (TRUE);
}
if (_stricmp(ptr,"IPBroadcast") == 0)
{
OurIPBroadcast = inet_addr(p_value);
if (OurIPBroadcast == INADDR_NONE) return (FALSE);
return (TRUE);
}
if (_stricmp(ptr,"IPNetMask") == 0)
{
OurNetMask = inet_addr(p_value);
if (OurNetMask == INADDR_NONE) return (FALSE);
return (TRUE);
}
if (_stricmp(ptr,"IPGateway") == 0)
{
DefaultIPAddr = inet_addr(p_value);
if (DefaultIPAddr == INADDR_NONE) return (FALSE);
return (TRUE);
}
// ARP 44.131.4.18 GM8BPQ-7 1 D
if (_stricmp(ptr,"MAP") == 0)
{
#ifdef LINBPQ
WritetoConsoleLocal("MAP not supported in LinBPQ IP Gateway\n");
return TRUE;
#endif
if (!p_value) return FALSE;
p_origport = strtok(NULL, " ,\t\n\r");
if (!p_origport) return FALSE;
p_host = strtok(NULL, " ,\t\n\r");
if (!p_host) return FALSE;
p_port = strtok(NULL, " ,\t\n\r");
if (!p_port) return FALSE;
port=atoi(p_origport);
if (port == 0) return FALSE;
mappedport=atoi(p_port);
if (mappedport == 0) return FALSE;
ipad = inet_addr(p_value);
map_table[map_table_len].sourceipaddr = ipad;
strcpy(map_table[map_table_len].hostname, p_host);
map_table[map_table_len].sourceport = ntohs(port);
map_table[map_table_len++].mappedport = ntohs(mappedport);
NeedResolver = TRUE;
return (TRUE);
}
//
// Bad line
//
return (FALSE);
}
static VOID DoARPTimer()
{
PARPDATA Arp = NULL;
int i;
for (i=0; i < NumberofARPEntries; i++)
{
Arp = ARPRecords[i];
if (!Arp->ARPVALID)
{
Arp->ARPTIMER--;
if (Arp->ARPTIMER == 0)
{
// Retry Request
SendARPMsg(Arp);
}
continue;
}
// Time out active entries
if (Arp->LOCKED == 0)
{
Arp->ARPTIMER--;
if (Arp->ARPTIMER == 0)
{
// Remove Entry
RemoveARP(Arp);
SaveARP();
}
}
}
}
static VOID DoRouteTimer()
{
int i;
PROUTEENTRY Route;
for (i=0; i < NumberofRoutes; i++)
{
Route = RouteRecords[i];
if (Route->RIPTIMOUT)
Route->RIPTIMOUT--;
}
}
// PCAP Support Code
#ifdef WIN32
static FARPROCX GetAddress(char * Proc)
{
FARPROCX ProcAddr;
int err=0;
char buf[256];
int n;
ProcAddr=(FARPROCX) GetProcAddress(PcapDriver,Proc);
if (ProcAddr == 0)
{
err=GetLastError();
n=sprintf(buf,"Error finding %s - %d", Proc,err);
WritetoConsoleLocal(buf);
return(0);
}
return ProcAddr;
}
static void packet_handler(u_char *param, const struct pcap_pkthdr *header, const u_char *pkt_data);
static int OpenPCAP()
{
u_long param=1;
BOOL bcopt=TRUE;
int i=0;
char errbuf[PCAP_ERRBUF_SIZE];
u_int netmask;
char packet_filter[64];
struct bpf_program fcode;
char buf[256];
int n;
PcapDriver=LoadLibrary(Dllname);
if (PcapDriver == NULL) return(FALSE);
if ((pcap_sendpacketx=GetAddress("pcap_sendpacket")) == 0 ) return FALSE;
if ((pcap_datalinkx=GetAddress("pcap_datalink")) == 0 ) return FALSE;
if ((pcap_compilex=GetAddress("pcap_compile")) == 0 ) return FALSE;
if ((pcap_setfilterx=GetAddress("pcap_setfilter")) == 0 ) return FALSE;
pcap_open_livex = (pcap_t * (__cdecl *)(const char *, int, int, int, char *)) GetProcAddress(PcapDriver,"pcap_open_live");
if (pcap_open_livex == NULL) return FALSE;
if ((pcap_geterrx=GetAddress("pcap_geterr")) == 0 ) return FALSE;
if ((pcap_next_exx=GetAddress("pcap_next_ex")) == 0 ) return FALSE;
/* Open the adapter */
adhandle = pcap_open_livex(Adapter, // name of the device
65536, // portion of the packet to capture.
// 65536 grants that the whole packet will be captured on all the MACs.
Promiscuous, // promiscuous mode (nonzero means promiscuous)
1, // read timeout
errbuf // error buffer
);
if (adhandle == NULL)
return FALSE;
/* Check the link layer. We support only Ethernet for simplicity. */
if(pcap_datalinkx(adhandle) != DLT_EN10MB)
{
n=sprintf(buf,"\nThis program works only on Ethernet networks.\n");
WritetoConsoleLocal(buf);
adhandle = 0;
return FALSE;
}
netmask=0xffffff;
// sprintf(packet_filter,"ether[12:2]=0x0800 or ether[12:2]=0x0806");
sprintf(packet_filter,"ether broadcast or ether dst %02x:%02x:%02x:%02x:%02x:%02x",
ourMACAddr[0], ourMACAddr[1], ourMACAddr[2],
ourMACAddr[3], ourMACAddr[4], ourMACAddr[5]);
//compile the filter
if (pcap_compilex(adhandle, &fcode, packet_filter, 1, netmask) <0 )
{
n=sprintf(buf,"\nUnable to compile the packet filter. Check the syntax.\n");
WritetoConsoleLocal(buf);
adhandle = 0;
return FALSE;
}
//set the filter
if (pcap_setfilterx(adhandle, &fcode)<0)
{
n=sprintf(buf,"\nError setting the filter.\n");
WritetoConsoleLocal(buf);
adhandle = 0;
return FALSE;
}
return TRUE;
}
#endif
int CompareMasks (const VOID * a, const VOID * b);
#ifndef LINBPQ
extern HFONT hFont;
struct tagMSG Msg;
char buf[1024];
static LRESULT CALLBACK ResWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;
HFONT hOldFont ;
struct hostent * hostptr;
struct in_addr ipad;
char line[100];
int index,displayline;
MINMAXINFO * mmi;
int i=1;
int nScrollCode,nPos;
switch (message)
{
case WM_GETMINMAXINFO:
mmi = (MINMAXINFO *)lParam;
mmi->ptMaxSize.x = 400;
mmi->ptMaxSize.y = Windowlength;
mmi->ptMaxTrackSize.x = 400;
mmi->ptMaxTrackSize.y = Windowlength;
break;
case WM_USER+199:
i=WSAGETASYNCERROR(lParam);
map_table[ResolveIndex].error=i;
if (i ==0)
{
// resolved ok
hostptr=(struct hostent *)&buf;
memcpy(&map_table[ResolveIndex].mappedipaddr,hostptr->h_addr,4);
}
InvalidateRect(hWnd,NULL,FALSE);
while (ResolveIndex < map_table_len)
{
ResolveIndex++;
WSAAsyncGetHostByName (hWnd,WM_USER+199,
map_table[ResolveIndex].hostname,
buf,MAXGETHOSTSTRUCT);
break;
}
break;
case WM_MDIACTIVATE:
{
// Set the system info menu when getting activated
if (lParam == (LPARAM) hWnd)
{
// Activate
RemoveMenu(hBaseMenu, 1, MF_BYPOSITION);
AppendMenu(hBaseMenu, MF_STRING + MF_POPUP, (WPARAM)hPopMenu, "Actions");
SendMessage(ClientWnd, WM_MDISETMENU, (WPARAM) hBaseMenu, (LPARAM)hWndMenu);
}
else
SendMessage(ClientWnd, WM_MDISETMENU, (WPARAM)hMainFrameMenu, (LPARAM)NULL);
DrawMenuBar(FrameWnd);
return DefMDIChildProc(hWnd, message, wParam, lParam);
}
case WM_COMMAND:
wmId = LOWORD(wParam); // Remember, these are...
wmEvent = HIWORD(wParam); // ...different for Win32!
if (wmId == BPQREREAD)
{
if (ProcessConfig())
{
FreeConfig();
ReadConfigFile();
PostMessage(hIPResWnd, WM_TIMER,0,0);
InvalidateRect(hWnd,NULL,TRUE);
}
else
Consoleprintf("Failed to reread config file - leaving config unchanged");
return 0;
}
/*
if (wmId == BPQADDARP)
{
if (ConfigWnd == 0)
{
ConfigWnd=CreateDialog(hInstance,ConfigClassName,0,NULL);
if (!ConfigWnd)
{
i=GetLastError();
return (FALSE);
}
ShowWindow(ConfigWnd, SW_SHOW);
UpdateWindow(ConfigWnd);
}
SetForegroundWindow(ConfigWnd);
return(0);
}
return 0;
*/
case WM_SYSCOMMAND:
wmId = LOWORD(wParam);
wmEvent = HIWORD(wParam);
switch (wmId)
{
case SC_RESTORE:
IPMinimized = FALSE;
SendMessage(ClientWnd, WM_MDIRESTORE, (WPARAM)hWnd, 0);
break;
case SC_MINIMIZE:
IPMinimized = TRUE;
break;
}
return DefMDIChildProc(hWnd, message, wParam, lParam);
case WM_VSCROLL:
nScrollCode = (int) LOWORD(wParam); // scroll bar value
nPos = (short int) HIWORD(wParam); // scroll box position
//hwndScrollBar = (HWND) lParam; // handle of scroll bar
if (nScrollCode == SB_LINEUP || nScrollCode == SB_PAGEUP)
{
baseline--;
if (baseline <0)
baseline=0;
}
if (nScrollCode == SB_LINEDOWN || nScrollCode == SB_PAGEDOWN)
{
baseline++;
if (baseline > map_table_len)
baseline = map_table_len;
}
if (nScrollCode == SB_THUMBTRACK)
{
baseline=nPos;
}
SetScrollPos(hWnd,SB_VERT,baseline,TRUE);
InvalidateRect(hWnd,NULL,TRUE);
break;
case WM_PAINT:
hdc = BeginPaint (hWnd, &ps);
hOldFont = SelectObject( hdc, hFont) ;
index = baseline;
displayline=0;
while (index < map_table_len)
{
if (map_table[index].ResolveFlag && map_table[index].error != 0)
{
// resolver error - Display Error Code
sprintf(hostaddr,"Error %d",map_table[index].error);
}
else
{
memcpy(&ipad,&map_table[index].mappedipaddr,4);
strncpy(hostaddr,inet_ntoa(ipad),16);
}
memcpy(&ipad,&map_table[index].mappedipaddr,4);
i=sprintf(line,"%.64s = %-.30s",
map_table[index].hostname,
hostaddr);
TextOut(hdc,0,(displayline++)*14+2,line,i);
index++;
}
SelectObject( hdc, hOldFont ) ;
EndPaint (hWnd, &ps);
break;
case WM_DESTROY:
// PostQuitMessage(0);
break;
case WM_TIMER:
for (ResolveIndex=0; ResolveIndex < map_table_len; ResolveIndex++)
{
WSAAsyncGetHostByName (hWnd,WM_USER+199,
map_table[ResolveIndex].hostname,
buf,MAXGETHOSTSTRUCT);
break;
}
default:
break;
}
return DefMDIChildProc(hWnd, message, wParam, lParam);
}
static void IPResolveNames( void *dummy )
{
SetTimer(hIPResWnd,1,15*60*1000,0);
PostMessage(hIPResWnd, WM_TIMER,0,0);
while (GetMessage(&Msg, hIPResWnd, 0, 0))
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
}
#endif
/*
; DO PSEUDO HEADER FIRST
;
MOV DX,600H ; PROTOCOL (REVERSED)
MOV AX,TCPLENGTH ; TCP LENGTH
XCHG AH,AL
ADD DX,AX
MOV AX,WORD PTR LOCALADDR[BX]
ADC DX,AX
MOV AX,WORD PTR LOCALADDR+2[BX]
ADC DX,AX
MOV AX,WORD PTR REMOTEADDR[BX]
ADC DX,AX
MOV AX,WORD PTR REMOTEADDR+2[BX]
ADC DX,AX
ADC DX,0
MOV PHSUM,DX
PUSH BX
MOV BX,TXBUFFER ; HEADER
MOV CX,TCPLENGTH ; PUT LENGTH INTO HEADER
MOV BUFFLEN[BX],CX
;
MOV SI,BUFFPTR[BX]
INC CX ; ROUND UP
SHR CX,1 ; WORD COUNT
CALL DO_CHECKSUM
ADD DX,PHSUM
ADC DX,0
NOT DX
MOV SI,BUFFPTR[BX]
MOV CHECKSUM[SI],DX
*/
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