basil00
aea3a3a858
Most NIC cards support checksum offloading, meaning that it is not necessary to calculate the full IP/TCP/UDP checksums for injected packets. WINDIVERT_ADDRESS has been extended to include 3 extra flags that indicate if the packet has full or pseudo checksums. This is a WIP.
261 lines
9.2 KiB
C
261 lines
9.2 KiB
C
/*
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* netdump.c
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* (C) 2017, all rights reserved,
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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 Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* DESCRIPTION:
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* This is a simple traffic monitor. It uses a WinDivert handle in SNIFF mode.
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* The SNIFF mode copies packets and does not block the original.
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*
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* usage: netdump.exe windivert-filter [priority]
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*
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*/
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#include <winsock2.h>
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#include <windows.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "windivert.h"
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#define MAXBUF 0xFFFF
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/*
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* Entry.
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*/
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int __cdecl main(int argc, char **argv)
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{
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HANDLE handle, console;
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UINT i;
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INT16 priority = 0;
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unsigned char packet[MAXBUF];
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UINT packet_len;
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WINDIVERT_ADDRESS addr;
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PWINDIVERT_IPHDR ip_header;
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PWINDIVERT_IPV6HDR ipv6_header;
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PWINDIVERT_ICMPHDR icmp_header;
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PWINDIVERT_ICMPV6HDR icmpv6_header;
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PWINDIVERT_TCPHDR tcp_header;
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PWINDIVERT_UDPHDR udp_header;
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const char *err_str;
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LARGE_INTEGER base, freq;
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double time_passed;
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// Check arguments.
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switch (argc)
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{
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case 2:
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break;
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case 3:
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priority = (INT16)atoi(argv[2]);
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break;
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default:
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fprintf(stderr, "usage: %s windivert-filter [priority]\n",
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argv[0]);
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fprintf(stderr, "examples:\n");
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fprintf(stderr, "\t%s true\n", argv[0]);
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fprintf(stderr, "\t%s \"outbound and tcp.DstPort == 80\" 1000\n",
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argv[0]);
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fprintf(stderr, "\t%s \"inbound and tcp.Syn\" -400\n", argv[0]);
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exit(EXIT_FAILURE);
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}
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// Get console for pretty colors.
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console = GetStdHandle(STD_OUTPUT_HANDLE);
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// Divert traffic matching the filter:
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handle = WinDivertOpen(argv[1], WINDIVERT_LAYER_NETWORK, priority,
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WINDIVERT_FLAG_SNIFF);
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if (handle == INVALID_HANDLE_VALUE)
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{
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if (GetLastError() == ERROR_INVALID_PARAMETER &&
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!WinDivertHelperCheckFilter(argv[1], WINDIVERT_LAYER_NETWORK,
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&err_str, NULL))
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{
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fprintf(stderr, "error: invalid filter \"%s\"\n", err_str);
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exit(EXIT_FAILURE);
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}
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fprintf(stderr, "error: failed to open the WinDivert device (%d)\n",
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GetLastError());
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exit(EXIT_FAILURE);
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}
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// Max-out the packet queue:
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if (!WinDivertSetParam(handle, WINDIVERT_PARAM_QUEUE_LEN, 8192))
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{
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fprintf(stderr, "error: failed to set packet queue length (%d)\n",
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GetLastError());
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exit(EXIT_FAILURE);
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}
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if (!WinDivertSetParam(handle, WINDIVERT_PARAM_QUEUE_TIME, 2048))
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{
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fprintf(stderr, "error: failed to set packet queue time (%d)\n",
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GetLastError());
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exit(EXIT_FAILURE);
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}
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// Set up timing:
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QueryPerformanceFrequency(&freq);
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QueryPerformanceCounter(&base);
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// Main loop:
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while (TRUE)
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{
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// Read a matching packet.
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if (!WinDivertRecv(handle, packet, sizeof(packet), &addr, &packet_len))
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{
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fprintf(stderr, "warning: failed to read packet (%d)\n",
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GetLastError());
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continue;
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}
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// Print info about the matching packet.
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WinDivertHelperParsePacket(packet, packet_len, &ip_header,
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&ipv6_header, &icmp_header, &icmpv6_header, &tcp_header,
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&udp_header, NULL, NULL);
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if (ip_header == NULL && ipv6_header == NULL)
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{
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fprintf(stderr, "warning: junk packet\n");
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}
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// Dump packet info:
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putchar('\n');
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SetConsoleTextAttribute(console, FOREGROUND_RED);
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time_passed = (double)(addr.Timestamp - base.QuadPart) /
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(double)freq.QuadPart;
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printf("Packet [Timestamp=%.8g, Direction=%s IfIdx=%u SubIfIdx=%u "
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"Loopback=%u]\n",
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time_passed, (addr.Direction == WINDIVERT_DIRECTION_OUTBOUND?
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"outbound": "inbound"), addr.IfIdx, addr.SubIfIdx,
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addr.Loopback);
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if (ip_header != NULL)
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{
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UINT8 *src_addr = (UINT8 *)&ip_header->SrcAddr;
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UINT8 *dst_addr = (UINT8 *)&ip_header->DstAddr;
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SetConsoleTextAttribute(console,
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FOREGROUND_GREEN | FOREGROUND_RED);
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printf("IPv4 [Version=%u HdrLength=%u TOS=%u Length=%u Id=0x%.4X "
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"Reserved=%u DF=%u MF=%u FragOff=%u TTL=%u Protocol=%u "
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"Checksum=0x%.4X SrcAddr=%u.%u.%u.%u DstAddr=%u.%u.%u.%u]\n",
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ip_header->Version, ip_header->HdrLength,
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ntohs(ip_header->TOS), ntohs(ip_header->Length),
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ntohs(ip_header->Id), WINDIVERT_IPHDR_GET_RESERVED(ip_header),
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WINDIVERT_IPHDR_GET_DF(ip_header),
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WINDIVERT_IPHDR_GET_MF(ip_header),
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ntohs(WINDIVERT_IPHDR_GET_FRAGOFF(ip_header)), ip_header->TTL,
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ip_header->Protocol, ntohs(ip_header->Checksum),
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src_addr[0], src_addr[1], src_addr[2], src_addr[3],
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dst_addr[0], dst_addr[1], dst_addr[2], dst_addr[3]);
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}
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if (ipv6_header != NULL)
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{
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UINT16 *src_addr = (UINT16 *)&ipv6_header->SrcAddr;
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UINT16 *dst_addr = (UINT16 *)&ipv6_header->DstAddr;
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SetConsoleTextAttribute(console,
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FOREGROUND_GREEN | FOREGROUND_RED);
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printf("IPv6 [Version=%u TrafficClass=%u FlowLabel=%u Length=%u "
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"NextHdr=%u HopLimit=%u SrcAddr=",
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ipv6_header->Version,
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WINDIVERT_IPV6HDR_GET_TRAFFICCLASS(ipv6_header),
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ntohl(WINDIVERT_IPV6HDR_GET_FLOWLABEL(ipv6_header)),
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ntohs(ipv6_header->Length), ipv6_header->NextHdr,
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ipv6_header->HopLimit);
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for (i = 0; i < 8; i++)
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{
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printf("%x%c", ntohs(src_addr[i]), (i == 7? ' ': ':'));
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}
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fputs("DstAddr=", stdout);
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for (i = 0; i < 8; i++)
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{
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printf("%x", ntohs(dst_addr[i]));
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if (i != 7)
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{
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putchar(':');
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}
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}
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fputs("]\n", stdout);
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}
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if (icmp_header != NULL)
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{
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SetConsoleTextAttribute(console, FOREGROUND_RED);
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printf("ICMP [Type=%u Code=%u Checksum=0x%.4X Body=0x%.8X]\n",
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icmp_header->Type, icmp_header->Code,
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ntohs(icmp_header->Checksum), ntohl(icmp_header->Body));
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}
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if (icmpv6_header != NULL)
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{
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SetConsoleTextAttribute(console, FOREGROUND_RED);
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printf("ICMPV6 [Type=%u Code=%u Checksum=0x%.4X Body=0x%.8X]\n",
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icmpv6_header->Type, icmpv6_header->Code,
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ntohs(icmpv6_header->Checksum), ntohl(icmpv6_header->Body));
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}
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if (tcp_header != NULL)
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{
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SetConsoleTextAttribute(console, FOREGROUND_GREEN);
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printf("TCP [SrcPort=%u DstPort=%u SeqNum=%u AckNum=%u "
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"HdrLength=%u Reserved1=%u Reserved2=%u Urg=%u Ack=%u "
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"Psh=%u Rst=%u Syn=%u Fin=%u Window=%u Checksum=0x%.4X "
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"UrgPtr=%u]\n",
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ntohs(tcp_header->SrcPort), ntohs(tcp_header->DstPort),
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ntohl(tcp_header->SeqNum), ntohl(tcp_header->AckNum),
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tcp_header->HdrLength, tcp_header->Reserved1,
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tcp_header->Reserved2, tcp_header->Urg, tcp_header->Ack,
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tcp_header->Psh, tcp_header->Rst, tcp_header->Syn,
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tcp_header->Fin, ntohs(tcp_header->Window),
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ntohs(tcp_header->Checksum), ntohs(tcp_header->UrgPtr));
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}
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if (udp_header != NULL)
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{
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SetConsoleTextAttribute(console, FOREGROUND_GREEN);
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printf("UDP [SrcPort=%u DstPort=%u Length=%u "
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"Checksum=0x%.4X]\n",
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ntohs(udp_header->SrcPort), ntohs(udp_header->DstPort),
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ntohs(udp_header->Length), ntohs(udp_header->Checksum));
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}
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SetConsoleTextAttribute(console, FOREGROUND_GREEN | FOREGROUND_BLUE);
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for (i = 0; i < packet_len; i++)
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{
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if (i % 20 == 0)
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{
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printf("\n\t");
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}
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printf("%.2X", (UINT8)packet[i]);
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}
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SetConsoleTextAttribute(console, FOREGROUND_RED | FOREGROUND_BLUE);
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for (i = 0; i < packet_len; i++)
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{
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if (i % 40 == 0)
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{
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printf("\n\t");
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}
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if (isprint(packet[i]))
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{
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putchar(packet[i]);
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}
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else
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{
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putchar('.');
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}
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}
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putchar('\n');
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SetConsoleTextAttribute(console,
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FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE);
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}
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}
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