mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-30 01:38:53 +00:00
399 lines
9.9 KiB
C
399 lines
9.9 KiB
C
/*
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* TAP-Windows -- A kernel driver to provide virtual tap
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* device functionality on Windows.
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*
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* This code was inspired by the CIPE-Win32 driver by Damion K. Wilson.
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*
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* This source code is Copyright (C) 2002-2014 OpenVPN Technologies, Inc.,
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* and is released under the GPL version 2 (see below).
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (see the file COPYING included with this
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* distribution); if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "tap.h"
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//-----------------
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// DEBUGGING OUTPUT
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//-----------------
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const char *g_LastErrorFilename;
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int g_LastErrorLineNumber;
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#if DBG
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DebugOutput g_Debug;
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BOOLEAN
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NewlineExists (const char *str, int len)
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{
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while (len-- > 0)
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{
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const char c = *str++;
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if (c == '\n')
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return TRUE;
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else if (c == '\0')
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break;
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}
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return FALSE;
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}
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VOID
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MyDebugInit (unsigned int bufsiz)
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{
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NdisZeroMemory (&g_Debug, sizeof (g_Debug));
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g_Debug.text = (char *) MemAlloc (bufsiz, FALSE);
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if (g_Debug.text)
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{
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g_Debug.capacity = bufsiz;
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}
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}
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VOID
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MyDebugFree ()
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{
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if (g_Debug.text)
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{
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MemFree (g_Debug.text, g_Debug.capacity);
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}
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NdisZeroMemory (&g_Debug, sizeof (g_Debug));
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}
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VOID
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MyDebugPrint (const unsigned char* format, ...)
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{
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if (g_Debug.text && g_Debug.capacity > 0 && CAN_WE_PRINT)
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{
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BOOLEAN owned;
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ACQUIRE_MUTEX_ADAPTIVE (&g_Debug.lock, owned);
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if (owned)
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{
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const int remaining = (int)g_Debug.capacity - (int)g_Debug.out;
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if (remaining > 0)
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{
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va_list args;
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NTSTATUS status;
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char *end;
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#ifdef DBG_PRINT
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va_start (args, format);
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vDbgPrintEx (DPFLTR_IHVNETWORK_ID, DPFLTR_INFO_LEVEL, format, args);
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va_end (args);
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#endif
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va_start (args, format);
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status = RtlStringCchVPrintfExA (g_Debug.text + g_Debug.out,
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remaining,
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&end,
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NULL,
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STRSAFE_NO_TRUNCATION | STRSAFE_IGNORE_NULLS,
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format,
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args);
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va_end (args);
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va_start (args, format);
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vDbgPrintEx(DPFLTR_IHVDRIVER_ID , 1, format, args);
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va_end (args);
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if (status == STATUS_SUCCESS)
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g_Debug.out = (unsigned int) (end - g_Debug.text);
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else
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g_Debug.error = TRUE;
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}
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else
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g_Debug.error = TRUE;
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RELEASE_MUTEX (&g_Debug.lock);
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}
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else
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g_Debug.error = TRUE;
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}
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}
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BOOLEAN
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GetDebugLine (
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__in char *buf,
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__in const int len
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)
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{
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static const char *truncated = "[OUTPUT TRUNCATED]\n";
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BOOLEAN ret = FALSE;
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NdisZeroMemory (buf, len);
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if (g_Debug.text && g_Debug.capacity > 0)
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{
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BOOLEAN owned;
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ACQUIRE_MUTEX_ADAPTIVE (&g_Debug.lock, owned);
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if (owned)
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{
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int i = 0;
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if (g_Debug.error || NewlineExists (g_Debug.text + g_Debug.in, (int)g_Debug.out - (int)g_Debug.in))
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{
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while (i < (len - 1) && g_Debug.in < g_Debug.out)
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{
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const char c = g_Debug.text[g_Debug.in++];
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if (c == '\n')
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break;
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buf[i++] = c;
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}
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if (i < len)
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buf[i] = '\0';
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}
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if (!i)
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{
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if (g_Debug.in == g_Debug.out)
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{
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g_Debug.in = g_Debug.out = 0;
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if (g_Debug.error)
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{
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const unsigned int tlen = strlen (truncated);
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if (tlen < g_Debug.capacity)
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{
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NdisMoveMemory (g_Debug.text, truncated, tlen+1);
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g_Debug.out = tlen;
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}
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g_Debug.error = FALSE;
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}
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}
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}
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else
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ret = TRUE;
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RELEASE_MUTEX (&g_Debug.lock);
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}
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}
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return ret;
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}
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VOID
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PrMac (const MACADDR mac)
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{
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DEBUGP (("%x:%x:%x:%x:%x:%x",
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mac[0], mac[1], mac[2],
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mac[3], mac[4], mac[5]));
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}
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VOID
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PrIP (IPADDR ip_addr)
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{
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const unsigned char *ip = (const unsigned char *) &ip_addr;
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DEBUGP (("%d.%d.%d.%d",
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ip[0], ip[1], ip[2], ip[3]));
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}
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const char *
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PrIPProto (int proto)
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{
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switch (proto)
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{
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case IPPROTO_UDP:
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return "UDP";
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case IPPROTO_TCP:
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return "TCP";
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case IPPROTO_ICMP:
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return "ICMP";
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case IPPROTO_IGMP:
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return "IGMP";
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default:
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return "???";
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}
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}
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VOID
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DumpARP (const char *prefix, const ARP_PACKET *arp)
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{
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DEBUGP (("%s ARP src=", prefix));
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PrMac (arp->m_MAC_Source);
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DEBUGP ((" dest="));
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PrMac (arp->m_MAC_Destination);
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DEBUGP ((" OP=0x%04x",
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(int)ntohs(arp->m_ARP_Operation)));
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DEBUGP ((" M=0x%04x(%d)",
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(int)ntohs(arp->m_MAC_AddressType),
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(int)arp->m_MAC_AddressSize));
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DEBUGP ((" P=0x%04x(%d)",
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(int)ntohs(arp->m_PROTO_AddressType),
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(int)arp->m_PROTO_AddressSize));
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DEBUGP ((" MacSrc="));
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PrMac (arp->m_ARP_MAC_Source);
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DEBUGP ((" MacDest="));
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PrMac (arp->m_ARP_MAC_Destination);
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DEBUGP ((" IPSrc="));
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PrIP (arp->m_ARP_IP_Source);
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DEBUGP ((" IPDest="));
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PrIP (arp->m_ARP_IP_Destination);
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DEBUGP (("\n"));
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}
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struct ethpayload
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{
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ETH_HEADER eth;
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UCHAR payload[DEFAULT_PACKET_LOOKAHEAD];
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};
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#ifdef ALLOW_PACKET_DUMP
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VOID
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DumpPacket2(
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__in const char *prefix,
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__in const ETH_HEADER *eth,
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__in const unsigned char *data,
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__in unsigned int len
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)
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{
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struct ethpayload *ep = (struct ethpayload *) MemAlloc (sizeof (struct ethpayload), TRUE);
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if (ep)
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{
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if (len > DEFAULT_PACKET_LOOKAHEAD)
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len = DEFAULT_PACKET_LOOKAHEAD;
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ep->eth = *eth;
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NdisMoveMemory (ep->payload, data, len);
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DumpPacket (prefix, (unsigned char *) ep, sizeof (ETH_HEADER) + len);
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MemFree (ep, sizeof (struct ethpayload));
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}
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}
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VOID
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DumpPacket(
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__in const char *prefix,
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__in const unsigned char *data,
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__in unsigned int len
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)
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{
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const ETH_HEADER *eth = (const ETH_HEADER *) data;
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const IPHDR *ip = (const IPHDR *) (data + sizeof (ETH_HEADER));
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if (len < sizeof (ETH_HEADER))
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{
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DEBUGP (("%s TRUNCATED PACKET LEN=%d\n", prefix, len));
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return;
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}
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// ARP Packet?
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if (len >= sizeof (ARP_PACKET) && eth->proto == htons (ETH_P_ARP))
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{
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DumpARP (prefix, (const ARP_PACKET *) data);
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return;
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}
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// IPv4 packet?
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if (len >= (sizeof (IPHDR) + sizeof (ETH_HEADER))
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&& eth->proto == htons (ETH_P_IP)
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&& IPH_GET_VER (ip->version_len) == 4)
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{
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const int hlen = IPH_GET_LEN (ip->version_len);
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const int blen = len - sizeof (ETH_HEADER);
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BOOLEAN did = FALSE;
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DEBUGP (("%s IPv4 %s[%d]", prefix, PrIPProto (ip->protocol), len));
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if (!(ntohs (ip->tot_len) == blen && hlen <= blen))
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{
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DEBUGP ((" XXX"));
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return;
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}
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// TCP packet?
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if (ip->protocol == IPPROTO_TCP
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&& blen - hlen >= (sizeof (TCPHDR)))
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{
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const TCPHDR *tcp = (TCPHDR *) (data + sizeof (ETH_HEADER) + hlen);
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DEBUGP ((" "));
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PrIP (ip->saddr);
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DEBUGP ((":%d", ntohs (tcp->source)));
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DEBUGP ((" -> "));
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PrIP (ip->daddr);
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DEBUGP ((":%d", ntohs (tcp->dest)));
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did = TRUE;
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}
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// UDP packet?
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else if ((ntohs (ip->frag_off) & IP_OFFMASK) == 0
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&& ip->protocol == IPPROTO_UDP
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&& blen - hlen >= (sizeof (UDPHDR)))
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{
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const UDPHDR *udp = (UDPHDR *) (data + sizeof (ETH_HEADER) + hlen);
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// DHCP packet?
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if ((udp->dest == htons (BOOTPC_PORT) || udp->dest == htons (BOOTPS_PORT))
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&& blen - hlen >= (sizeof (UDPHDR) + sizeof (DHCP)))
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{
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const DHCP *dhcp = (DHCP *) (data
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+ hlen
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+ sizeof (ETH_HEADER)
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+ sizeof (UDPHDR));
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int optlen = len
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- sizeof (ETH_HEADER)
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- hlen
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- sizeof (UDPHDR)
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- sizeof (DHCP);
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if (optlen < 0)
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optlen = 0;
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DumpDHCP (eth, ip, udp, dhcp, optlen);
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did = TRUE;
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}
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if (!did)
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{
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DEBUGP ((" "));
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PrIP (ip->saddr);
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DEBUGP ((":%d", ntohs (udp->source)));
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DEBUGP ((" -> "));
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PrIP (ip->daddr);
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DEBUGP ((":%d", ntohs (udp->dest)));
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did = TRUE;
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}
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}
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if (!did)
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{
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DEBUGP ((" ipproto=%d ", ip->protocol));
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PrIP (ip->saddr);
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DEBUGP ((" -> "));
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PrIP (ip->daddr);
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}
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DEBUGP (("\n"));
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return;
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}
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{
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DEBUGP (("%s ??? src=", prefix));
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PrMac (eth->src);
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DEBUGP ((" dest="));
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PrMac (eth->dest);
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DEBUGP ((" proto=0x%04x len=%d\n",
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(int) ntohs(eth->proto),
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len));
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}
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}
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#endif // ALLOW_PACKET_DUMP
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#endif
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