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-rwxr-xr-xtap-win32/error.c378
1 files changed, 378 insertions, 0 deletions
diff --git a/tap-win32/error.c b/tap-win32/error.c
new file mode 100755
index 0000000..5b25f48
--- /dev/null
+++ b/tap-win32/error.c
@@ -0,0 +1,378 @@
+/*
+ * TAP-Win32/TAP-Win64 -- A kernel driver to provide virtual tap
+ * device functionality on Windows.
+ *
+ * This code was inspired by the CIPE-Win32 driver by Damion K. Wilson.
+ *
+ * This source code is Copyright (C) 2002-2010 OpenVPN Technologies, Inc.,
+ * and is released under the GPL version 2 (see below).
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * 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 (see the file COPYING included with this
+ * distribution); if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+//-----------------
+// DEBUGGING OUTPUT
+//-----------------
+
+const char *g_LastErrorFilename;
+int g_LastErrorLineNumber;
+
+#if DBG
+
+DebugOutput g_Debug;
+
+BOOLEAN
+NewlineExists (const char *str, int len)
+{
+ while (len-- > 0)
+ {
+ const char c = *str++;
+ if (c == '\n')
+ return TRUE;
+ else if (c == '\0')
+ break;
+ }
+ return FALSE;
+}
+
+VOID
+MyDebugInit (unsigned int bufsiz)
+{
+ NdisZeroMemory (&g_Debug, sizeof (g_Debug));
+ g_Debug.text = (char *) MemAlloc (bufsiz, FALSE);
+ if (g_Debug.text)
+ g_Debug.capacity = bufsiz;
+}
+
+VOID
+MyDebugFree ()
+{
+ if (g_Debug.text)
+ MemFree (g_Debug.text, g_Debug.capacity);
+ NdisZeroMemory (&g_Debug, sizeof (g_Debug));
+}
+
+VOID
+MyDebugPrint (const unsigned char* format, ...)
+{
+ if (g_Debug.text && g_Debug.capacity > 0 && CAN_WE_PRINT)
+ {
+ BOOLEAN owned;
+ ACQUIRE_MUTEX_ADAPTIVE (&g_Debug.lock, owned);
+ if (owned)
+ {
+ const int remaining = (int)g_Debug.capacity - (int)g_Debug.out;
+
+ if (remaining > 0)
+ {
+ va_list args;
+ NTSTATUS status;
+ char *end;
+
+ va_start (args, format);
+ status = RtlStringCchVPrintfExA (g_Debug.text + g_Debug.out,
+ remaining,
+ &end,
+ NULL,
+ STRSAFE_NO_TRUNCATION | STRSAFE_IGNORE_NULLS,
+ format,
+ args);
+ va_end (args);
+
+ if (status == STATUS_SUCCESS)
+ g_Debug.out = (unsigned int) (end - g_Debug.text);
+ else
+ g_Debug.error = TRUE;
+ }
+ else
+ g_Debug.error = TRUE;
+
+ RELEASE_MUTEX (&g_Debug.lock);
+ }
+ else
+ g_Debug.error = TRUE;
+ }
+}
+
+BOOLEAN
+GetDebugLine (char *buf, const int len)
+{
+ static const char *truncated = "[OUTPUT TRUNCATED]\n";
+ BOOLEAN ret = FALSE;
+
+ NdisZeroMemory (buf, len);
+
+ if (g_Debug.text && g_Debug.capacity > 0)
+ {
+ BOOLEAN owned;
+ ACQUIRE_MUTEX_ADAPTIVE (&g_Debug.lock, owned);
+ if (owned)
+ {
+ int i = 0;
+
+ if (g_Debug.error || NewlineExists (g_Debug.text + g_Debug.in, (int)g_Debug.out - (int)g_Debug.in))
+ {
+ while (i < (len - 1) && g_Debug.in < g_Debug.out)
+ {
+ const char c = g_Debug.text[g_Debug.in++];
+ if (c == '\n')
+ break;
+ buf[i++] = c;
+ }
+ if (i < len)
+ buf[i] = '\0';
+ }
+
+ if (!i)
+ {
+ if (g_Debug.in == g_Debug.out)
+ {
+ g_Debug.in = g_Debug.out = 0;
+ if (g_Debug.error)
+ {
+ const unsigned int tlen = strlen (truncated);
+ if (tlen < g_Debug.capacity)
+ {
+ NdisMoveMemory (g_Debug.text, truncated, tlen+1);
+ g_Debug.out = tlen;
+ }
+ g_Debug.error = FALSE;
+ }
+ }
+ }
+ else
+ ret = TRUE;
+
+ RELEASE_MUTEX (&g_Debug.lock);
+ }
+ }
+ return ret;
+}
+
+VOID
+MyAssert (const unsigned char *file, int line)
+{
+ DEBUGP (("MYASSERT failed %s/%d\n", file, line));
+ KeBugCheckEx (0x0F00BABA,
+ (ULONG_PTR) line,
+ (ULONG_PTR) 0,
+ (ULONG_PTR) 0,
+ (ULONG_PTR) 0);
+}
+
+VOID
+PrMac (const MACADDR mac)
+{
+ DEBUGP (("%x:%x:%x:%x:%x:%x",
+ mac[0], mac[1], mac[2],
+ mac[3], mac[4], mac[5]));
+}
+
+VOID
+PrIP (IPADDR ip_addr)
+{
+ const unsigned char *ip = (const unsigned char *) &ip_addr;
+
+ DEBUGP (("%d.%d.%d.%d",
+ ip[0], ip[1], ip[2], ip[3]));
+}
+
+const char *
+PrIPProto (int proto)
+{
+ switch (proto)
+ {
+ case IPPROTO_UDP:
+ return "UDP";
+ case IPPROTO_TCP:
+ return "TCP";
+ case IPPROTO_ICMP:
+ return "ICMP";
+ case IPPROTO_IGMP:
+ return "IGMP";
+ default:
+ return "???";
+ }
+}
+
+VOID
+DumpARP (const char *prefix, const ARP_PACKET *arp)
+{
+ DEBUGP (("%s ARP src=", prefix));
+ PrMac (arp->m_MAC_Source);
+ DEBUGP ((" dest="));
+ PrMac (arp->m_MAC_Destination);
+ DEBUGP ((" OP=0x%04x",
+ (int)ntohs(arp->m_ARP_Operation)));
+ DEBUGP ((" M=0x%04x(%d)",
+ (int)ntohs(arp->m_MAC_AddressType),
+ (int)arp->m_MAC_AddressSize));
+ DEBUGP ((" P=0x%04x(%d)",
+ (int)ntohs(arp->m_PROTO_AddressType),
+ (int)arp->m_PROTO_AddressSize));
+
+ DEBUGP ((" MacSrc="));
+ PrMac (arp->m_ARP_MAC_Source);
+ DEBUGP ((" MacDest="));
+ PrMac (arp->m_ARP_MAC_Destination);
+
+ DEBUGP ((" IPSrc="));
+ PrIP (arp->m_ARP_IP_Source);
+ DEBUGP ((" IPDest="));
+ PrIP (arp->m_ARP_IP_Destination);
+
+ DEBUGP (("\n"));
+}
+
+struct ethpayload {
+ ETH_HEADER eth;
+ UCHAR payload[DEFAULT_PACKET_LOOKAHEAD];
+};
+
+VOID
+DumpPacket2 (const char *prefix,
+ const ETH_HEADER *eth,
+ const unsigned char *data,
+ unsigned int len)
+{
+ struct ethpayload *ep = (struct ethpayload *) MemAlloc (sizeof (struct ethpayload), TRUE);
+ if (ep)
+ {
+ if (len > DEFAULT_PACKET_LOOKAHEAD)
+ len = DEFAULT_PACKET_LOOKAHEAD;
+ ep->eth = *eth;
+ NdisMoveMemory (ep->payload, data, len);
+ DumpPacket (prefix, (unsigned char *) ep, sizeof (ETH_HEADER) + len);
+ MemFree (ep, sizeof (struct ethpayload));
+ }
+}
+
+VOID
+DumpPacket (const char *prefix,
+ const unsigned char *data,
+ unsigned int len)
+{
+ const ETH_HEADER *eth = (const ETH_HEADER *) data;
+ const IPHDR *ip = (const IPHDR *) (data + sizeof (ETH_HEADER));
+
+ if (len < sizeof (ETH_HEADER))
+ {
+ DEBUGP (("%s TRUNCATED PACKET LEN=%d\n", prefix, len));
+ return;
+ }
+
+ // ARP Packet?
+ if (len >= sizeof (ARP_PACKET) && eth->proto == htons (ETH_P_ARP))
+ {
+ DumpARP (prefix, (const ARP_PACKET *) data);
+ return;
+ }
+
+ // IPv4 packet?
+ if (len >= (sizeof (IPHDR) + sizeof (ETH_HEADER))
+ && eth->proto == htons (ETH_P_IP)
+ && IPH_GET_VER (ip->version_len) == 4)
+ {
+ const int hlen = IPH_GET_LEN (ip->version_len);
+ const int blen = len - sizeof (ETH_HEADER);
+ BOOLEAN did = FALSE;
+
+ DEBUGP (("%s IPv4 %s[%d]", prefix, PrIPProto (ip->protocol), len));
+
+ if (!(ntohs (ip->tot_len) == blen && hlen <= blen))
+ {
+ DEBUGP ((" XXX"));
+ return;
+ }
+
+ // TCP packet?
+ if (ip->protocol == IPPROTO_TCP
+ && blen - hlen >= (sizeof (TCPHDR)))
+ {
+ const TCPHDR *tcp = (TCPHDR *) (data + sizeof (ETH_HEADER) + hlen);
+ DEBUGP ((" "));
+ PrIP (ip->saddr);
+ DEBUGP ((":%d", ntohs (tcp->source)));
+ DEBUGP ((" -> "));
+ PrIP (ip->daddr);
+ DEBUGP ((":%d", ntohs (tcp->dest)));
+ did = TRUE;
+ }
+
+ // UDP packet?
+ else if ((ntohs (ip->frag_off) & IP_OFFMASK) == 0
+ && ip->protocol == IPPROTO_UDP
+ && blen - hlen >= (sizeof (UDPHDR)))
+ {
+ const UDPHDR *udp = (UDPHDR *) (data + sizeof (ETH_HEADER) + hlen);
+
+ // DHCP packet?
+ if ((udp->dest == htons (BOOTPC_PORT) || udp->dest == htons (BOOTPS_PORT))
+ && blen - hlen >= (sizeof (UDPHDR) + sizeof (DHCP)))
+ {
+ const DHCP *dhcp = (DHCP *) (data
+ + hlen
+ + sizeof (ETH_HEADER)
+ + sizeof (UDPHDR));
+
+ int optlen = len
+ - sizeof (ETH_HEADER)
+ - hlen
+ - sizeof (UDPHDR)
+ - sizeof (DHCP);
+
+ if (optlen < 0)
+ optlen = 0;
+
+ DumpDHCP (eth, ip, udp, dhcp, optlen);
+ did = TRUE;
+ }
+
+ if (!did)
+ {
+ DEBUGP ((" "));
+ PrIP (ip->saddr);
+ DEBUGP ((":%d", ntohs (udp->source)));
+ DEBUGP ((" -> "));
+ PrIP (ip->daddr);
+ DEBUGP ((":%d", ntohs (udp->dest)));
+ did = TRUE;
+ }
+ }
+
+ if (!did)
+ {
+ DEBUGP ((" ipproto=%d ", ip->protocol));
+ PrIP (ip->saddr);
+ DEBUGP ((" -> "));
+ PrIP (ip->daddr);
+ }
+
+ DEBUGP (("\n"));
+ return;
+ }
+
+ {
+ DEBUGP (("%s ??? src=", prefix));
+ PrMac (eth->src);
+ DEBUGP ((" dest="));
+ PrMac (eth->dest);
+ DEBUGP ((" proto=0x%04x len=%d\n",
+ (int) ntohs(eth->proto),
+ len));
+ }
+}
+
+#endif
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