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First commit of the Windows Divert project

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basil00
2011-08-19 20:11:17 +08:00
commit 019f9d509b
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examples/netfilter/Makefile
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!INCLUDE $(NTMAKEENV)\makefile.def
examples/netfilter/netfilter.c
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/*
* netfilter.c
* (C) 2011, all rights reserved,
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
/*
* DESCRIPTION:
* This is a simple traffic filter
*
* usage: netfilter.exe divert-filter
*
* Any traffic that matches the divert-filter will be blocked using one of
* the following methods:
* - TCP: send a TCP RST to the packet's source.
* - UDP: send a ICMP(v6) "destination unreachable" to the packet's source.
* - ICMP/ICMPv6: Drop the packet.
*
* This program is similar to Linux's iptables with the "-j REJECT" target.
*/
#include <winsock2.h>
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "divert.h"
#define MAXBUF 2048
/*
* Pre-fabricated packets.
*/
typedef struct
{
DIVERT_PACKET divert;
DIVERT_IPHDR ip;
} PACKET, *PPACKET;
typedef struct
{
DIVERT_PACKET divert;
DIVERT_IPV6HDR ipv6;
} PACKETV6, *PPACKETV6;
typedef struct
{
PACKET header;
DIVERT_TCPHDR tcp;
} TCPPACKET, *PTCPPACKET;
typedef struct
{
PACKETV6 header;
DIVERT_TCPHDR tcp;
} TCPV6PACKET, *PTCPV6PACKET;
typedef struct
{
PACKET header;
DIVERT_ICMPHDR icmp;
UINT8 data[];
} ICMPPACKET, *PICMPPACKET;
typedef struct
{
PACKETV6 header;
DIVERT_ICMPV6HDR icmpv6;
UINT8 data[];
} ICMPV6PACKET, *PICMPV6PACKET;
/*
* Prototypes.
*/
static void PacketIpInit(PPACKET packet);
static void PacketIpTcpInit(PTCPPACKET packet);
static void PacketIpIcmpInit(PICMPPACKET packet);
static void PacketIpv6Init(PPACKETV6 packet);
static void PacketIpv6TcpInit(PTCPV6PACKET packet);
static void PacketIpv6Icmpv6Init(PICMPV6PACKET packet);
/*
* Entry.
*/
int main(int argc, char **argv)
{
HANDLE handle, console;
size_t slen, flen;
UINT i;
char filter[MAXBUF];
char packet[MAXBUF];
PDIVERT_PACKET ppacket = (PDIVERT_PACKET)packet;
UINT ppacket_len;
PDIVERT_IPHDR ip_header;
PDIVERT_IPV6HDR ipv6_header;
PDIVERT_ICMPHDR icmp_header;
PDIVERT_ICMPV6HDR icmpv6_header;
PDIVERT_TCPHDR tcp_header;
PDIVERT_UDPHDR udp_header;
UINT payload_len;
TCPPACKET reset0;
PTCPPACKET reset = &reset0;
UINT8 dnr0[sizeof(ICMPPACKET) + 0x0F*sizeof(UINT32) + 8 + 1];
PICMPPACKET dnr = (PICMPPACKET)dnr0;
TCPV6PACKET resetv6_0;
PTCPV6PACKET resetv6 = &resetv6_0;
UINT8 dnrv6_0[sizeof(ICMPV6PACKET) + sizeof(DIVERT_IPV6HDR) +
sizeof(DIVERT_TCPHDR)];
PICMPV6PACKET dnrv6 = (PICMPV6PACKET)dnrv6_0;
// Concat all command line args into a filter string.
flen = 0;
for (i = 1; (int)i < argc; i++)
{
slen = strlen(argv[i]);
if (flen + slen + 1 >= MAXBUF)
{
fprintf(stderr, "error: filter too long\n");
exit(EXIT_FAILURE);
}
strcpy(filter+flen, argv[i]);
flen += slen;
filter[flen] = ' ';
flen++;
}
filter[flen] = '\0';
// Initialize all packets.
PacketIpTcpInit(reset);
reset->tcp.Rst = 1;
reset->tcp.Ack = 1;
PacketIpIcmpInit(dnr);
dnr->icmp.Type = 3; // Destination not reachable.
dnr->icmp.Code = 3; // Port not reachable.
PacketIpv6TcpInit(resetv6);
resetv6->tcp.Rst = 1;
resetv6->tcp.Ack = 1;
PacketIpv6Icmpv6Init(dnrv6);
dnrv6->header.ipv6.Length = htons(sizeof(DIVERT_ICMPV6HDR) + 4 +
sizeof(DIVERT_IPV6HDR) + sizeof(DIVERT_TCPHDR));
dnrv6->icmpv6.Type = 1; // Destination not reachable.
dnrv6->icmpv6.Code = 4; // Port not reachable.
// Get console for pretty colors.
console = GetStdHandle(STD_OUTPUT_HANDLE);
// Divert traffic matching the filter:
handle = DivertOpen(filter);
if (handle == INVALID_HANDLE_VALUE)
{
if (GetLastError() == ERROR_INVALID_PARAMETER)
{
fprintf(stderr, "error: filter syntax error\n");
exit(EXIT_FAILURE);
}
fprintf(stderr, "error: failed to open Divert device (%d)\n",
GetLastError());
exit(EXIT_FAILURE);
}
// Main loop:
while (TRUE)
{
// Read a matching packet.
if (!DivertRecv(handle, ppacket, sizeof(packet), &ppacket_len))
{
fprintf(stderr, "warning: failed to read packet\n");
continue;
}
// Print info about the matching packet.
DivertHelperParse(ppacket, ppacket_len, &ip_header, &ipv6_header,
&icmp_header, &icmpv6_header, &tcp_header, &udp_header, NULL,
&payload_len);
if (ip_header == NULL && ipv6_header == NULL)
{
continue;
}
// Dump packet info:
SetConsoleTextAttribute(console, FOREGROUND_RED);
fputs("BLOCK ", stdout);
SetConsoleTextAttribute(console,
FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE);
if (ip_header != NULL)
{
UINT8 *src_addr = (UINT8 *)&ip_header->SrcAddr;
UINT8 *dst_addr = (UINT8 *)&ip_header->DstAddr;
printf("ip.SrcAddr=%u.%u.%u.%u ip.DstAddr=%u.%u.%u.%u ",
src_addr[0], src_addr[1], src_addr[2], src_addr[3],
dst_addr[0], dst_addr[1], dst_addr[2], dst_addr[3]);
}
if (ipv6_header != NULL)
{
UINT16 *src_addr = (UINT16 *)&ipv6_header->SrcAddr;
UINT16 *dst_addr = (UINT16 *)&ipv6_header->DstAddr;
fputs("ipv6.SrcAddr=", stdout);
for (i = 0; i < 8; i++)
{
printf("%x%c", ntohs(src_addr[i]), (i == 7? ' ': ':'));
}
fputs(" ipv6.DstAddr=", stdout);
for (i = 0; i < 8; i++)
{
printf("%x%c", ntohs(dst_addr[i]), (i == 7? ' ': ':'));
}
putchar(' ');
}
if (icmp_header != NULL)
{
printf("icmp.Type=%u icmp.Code=%u ",
icmp_header->Type, icmp_header->Code);
// Simply drop ICMP
}
if (icmpv6_header != NULL)
{
printf("icmpv6.Type=%u icmpv6.Code=%u ",
icmpv6_header->Type, icmpv6_header->Code);
// Simply drop ICMPv6
}
if (tcp_header != NULL)
{
printf("tcp.SrcPort=%u tcp.DstPort=%u tcp.Flags=",
ntohs(tcp_header->SrcPort), ntohs(tcp_header->DstPort));
if (tcp_header->Fin)
{
fputs("[FIN]", stdout);
}
if (tcp_header->Rst)
{
fputs("[RST]", stdout);
}
if (tcp_header->Urg)
{
fputs("[URG]", stdout);
}
if (tcp_header->Syn)
{
fputs("[SYN]", stdout);
}
if (tcp_header->Psh)
{
fputs("[PSH]", stdout);
}
if (tcp_header->Ack)
{
fputs("[ACK]", stdout);
}
putchar(' ');
if (ip_header != NULL)
{
reset->header.divert.IfIdx = ppacket->IfIdx;
reset->header.divert.SubIfIdx = ppacket->SubIfIdx;
reset->header.divert.Direction = !ppacket->Direction;
reset->header.ip.SrcAddr = ip_header->DstAddr;
reset->header.ip.DstAddr = ip_header->SrcAddr;
reset->tcp.SrcPort = tcp_header->DstPort;
reset->tcp.DstPort = tcp_header->SrcPort;
reset->tcp.SeqNum =
(tcp_header->Ack? tcp_header->AckNum: 0);
reset->tcp.AckNum =
(tcp_header->Syn?
htonl(ntohl(tcp_header->SeqNum) + 1):
htonl(ntohl(tcp_header->SeqNum) + payload_len));
DivertHelperCalcChecksums((PDIVERT_PACKET)reset,
sizeof(TCPPACKET), 0);
if (!DivertSend(handle, (PDIVERT_PACKET)reset,
sizeof(TCPPACKET), NULL))
{
fprintf(stderr, "warning: failed to send TCP reset (%d)\n",
GetLastError());
}
}
if (ipv6_header != NULL)
{
resetv6->header.divert.IfIdx = ppacket->IfIdx;
resetv6->header.divert.SubIfIdx = ppacket->SubIfIdx;
resetv6->header.divert.Direction = !ppacket->Direction;
memcpy(resetv6->header.ipv6.SrcAddr, ipv6_header->DstAddr,
sizeof(resetv6->header.ipv6.SrcAddr));
memcpy(resetv6->header.ipv6.DstAddr, ipv6_header->SrcAddr,
sizeof(resetv6->header.ipv6.DstAddr));
resetv6->tcp.SrcPort = tcp_header->DstPort;
resetv6->tcp.DstPort = tcp_header->SrcPort;
resetv6->tcp.SeqNum =
(tcp_header->Ack? tcp_header->AckNum: 0);
resetv6->tcp.AckNum =
(tcp_header->Syn?
htonl(ntohl(tcp_header->SeqNum) + 1):
htonl(ntohl(tcp_header->SeqNum) + payload_len));
DivertHelperCalcChecksums((PDIVERT_PACKET)resetv6,
sizeof(TCPV6PACKET), 0);
if (!DivertSend(handle, (PDIVERT_PACKET)resetv6,
sizeof(TCPV6PACKET), NULL))
{
fprintf(stderr, "warning: failed to send TCP (IPV6) "
"reset (%d)\n", GetLastError());
}
}
}
if (udp_header != NULL)
{
printf("udp.SrcPort=%u udp.DstPort=%u ",
ntohs(udp_header->SrcPort), ntohs(udp_header->DstPort));
if (ip_header != NULL)
{
// NOTE: For some ICMP error messages, WFP does not seem to
// support INBOUND injection. As a work-around, we
// always inject OUTBOUND.
UINT icmp_length = ip_header->HdrLength*sizeof(UINT32) + 8;
memcpy(dnr->data, ip_header, icmp_length);
icmp_length += sizeof(ICMPPACKET);
dnr->header.divert.IfIdx = ppacket->IfIdx;
dnr->header.divert.SubIfIdx = ppacket->SubIfIdx;
dnr->header.divert.Direction =
DIVERT_PACKET_DIRECTION_OUTBOUND;
dnr->header.ip.Length =
htons(icmp_length - sizeof(DIVERT_PACKET));
dnr->header.ip.SrcAddr = ip_header->DstAddr;
dnr->header.ip.DstAddr = ip_header->SrcAddr;
DivertHelperCalcChecksums((PDIVERT_PACKET)dnr, icmp_length, 0);
if (!DivertSend(handle, (PDIVERT_PACKET)dnr, icmp_length,
NULL))
{
fprintf(stderr, "warning: failed to send ICMP message "
"(%d)\n", GetLastError());
}
}
if (ipv6_header != NULL)
{
UINT icmpv6_length = sizeof(DIVERT_IPV6HDR) +
sizeof(DIVERT_TCPHDR);
memcpy(dnrv6->data, ipv6_header, icmpv6_length);
icmpv6_length += sizeof(ICMPV6PACKET);
dnrv6->header.divert.IfIdx = ppacket->IfIdx;
dnrv6->header.divert.SubIfIdx = ppacket->SubIfIdx;
dnrv6->header.divert.Direction =
DIVERT_PACKET_DIRECTION_OUTBOUND;
memcpy(dnrv6->header.ipv6.SrcAddr, ipv6_header->DstAddr,
sizeof(dnrv6->header.ipv6.SrcAddr));
memcpy(dnrv6->header.ipv6.DstAddr, ipv6_header->SrcAddr,
sizeof(dnrv6->header.ipv6.DstAddr));
DivertHelperCalcChecksums((PDIVERT_PACKET)dnrv6, icmpv6_length,
0);
if (!DivertSend(handle, (PDIVERT_PACKET)dnrv6, icmpv6_length,
NULL))
{
fprintf(stderr, "warning: failed to send ICMPv6 message "
"(%d)\n", GetLastError());
}
}
}
putchar('\n');
}
}
/*
* Initialize a PACKET.
*/
static void PacketIpInit(PPACKET packet)
{
memset(packet, 0, sizeof(PACKET));
packet->ip.Version = 4;
packet->ip.HdrLength = sizeof(DIVERT_IPHDR) / sizeof(UINT32);
packet->ip.Id = ntohs(0xDEAD);
packet->ip.TTL = 64;
}
/*
* Initialize a TCPPACKET.
*/
static void PacketIpTcpInit(PTCPPACKET packet)
{
memset(packet, 0, sizeof(TCPPACKET));
PacketIpInit(&packet->header);
packet->header.ip.Length = htons(sizeof(TCPPACKET) -
sizeof(DIVERT_PACKET));
packet->header.ip.Protocol = IPPROTO_TCP;
packet->tcp.HdrLength = sizeof(DIVERT_TCPHDR) / sizeof(UINT32);
}
/*
* Initialize an ICMPPACKET.
*/
static void PacketIpIcmpInit(PICMPPACKET packet)
{
memset(packet, 0, sizeof(ICMPPACKET));
PacketIpInit(&packet->header);
packet->header.ip.Protocol = IPPROTO_ICMP;
}
/*
* Initialize a PACKETV6.
*/
static void PacketIpv6Init(PPACKETV6 packet)
{
memset(packet, 0, sizeof(PACKETV6));
packet->ipv6.Version = 6;
packet->ipv6.HopLimit = 64;
}
/*
* Initialize a TCPV6PACKET.
*/
static void PacketIpv6TcpInit(PTCPV6PACKET packet)
{
memset(packet, 0, sizeof(TCPV6PACKET));
PacketIpv6Init(&packet->header);
packet->header.ipv6.Length = htons(sizeof(DIVERT_TCPHDR));
packet->header.ipv6.NextHdr = IPPROTO_TCP;
packet->tcp.HdrLength = sizeof(DIVERT_TCPHDR) / sizeof(UINT32);
}
/*
* Initialize an ICMP PACKET.
*/
static void PacketIpv6Icmpv6Init(PICMPV6PACKET packet)
{
memset(packet, 0, sizeof(ICMPV6PACKET));
PacketIpv6Init(&packet->header);
packet->header.ipv6.NextHdr = IPPROTO_ICMPV6;
}
examples/netfilter/sources
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# sources
# (C) 2011, all rights reserved,
#
# 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 3 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, see <http://www.gnu.org/licenses/>.
TARGETNAME=netfilter
TARGETTYPE=PROGRAM
TARGETPATH=..\..\install
TARGETLIBS=\
$(SDK_LIB_PATH)\setupapi.lib \
$(SDK_LIB_PATH)\user32.lib \
$(SDK_LIB_PATH)\ws2_32.lib \
$(TARGETPATH)\$(_BUILDARCH)\divert.lib
UMTYPE=console
UMENTRY=main
USE_MSVCRT=1
INCLUDES=$(DDK_INC_PATH);$(KMDF_INC_PATH)\$(KMDF_VER_PATH);..\..\include
SOURCES=netfilter.c