rnhmjoj
f5bff09ffe
Returning a pointer to a static buffer in an object that is later deleted results in an empty IP header, depending on the compiler and optimisation level. Instead we can write directly inside the packet buffer.
140 lines
4.9 KiB
C++
140 lines
4.9 KiB
C++
/*-
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* Copyright (c) 2002, Matt Rosenfeld
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of this program nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "FakeroutePacket.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/ip.h>
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#include <netinet/ip_icmp.h>
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#include <netinet/udp.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "in_cksum.h"
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FakeroutePacket::FakeroutePacket(u_int16_t localReceivedSourcePort,
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u_int16_t localReceivedDestinationPort,
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char* localSpoofedSourceAddress,
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char* localSpoofedDestinationAddress,
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char* localReceivedSourceAddress) :
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ICMP_HDR_SIZE(sizeof(struct icmp)),
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IP_HDR_SIZE(sizeof(struct iphdr)),
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UDP_HDR_SIZE(sizeof(struct udphdr))
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{
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receivedSourcePort = localReceivedSourcePort;
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receivedDestinationPort = localReceivedDestinationPort;
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receivedSourceAddress = localReceivedSourceAddress;
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spoofedSourceAddress = localSpoofedSourceAddress;
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spoofedDestinationAddress = localSpoofedDestinationAddress;
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}
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FakeroutePacket::~FakeroutePacket() {}
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void FakeroutePacket::sendOn(int fd) {
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int sockfd;
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int one = 1;
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struct sockaddr_in packetTo;
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unsigned char packet[IP_HDR_SIZE + ICMP_HDR_SIZE + UDP_HDR_SIZE];
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memset((void*)packet, 0, sizeof(packet));
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memset((void*)&packetTo, 0, sizeof(packetTo));
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if ((sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0) {
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fprintf(stderr, "Error Creating Raw Socket.");
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exit(1);
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}
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if (setsockopt(sockfd, IPPROTO_IP, IP_HDRINCL, (char*)&one, sizeof(one)) < 0) {
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fprintf(stderr, "Error Setting Raw Socket Socket Option.");
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exit(1);
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}
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packetTo.sin_family = AF_INET;
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packetTo.sin_addr.s_addr = inet_addr(spoofedDestinationAddress);
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buildUdpHeader((char*)(packet + IP_HDR_SIZE + ICMP_HDR_SIZE),
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receivedSourcePort, receivedDestinationPort);
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buildIcmpHeader((char*)(packet + IP_HDR_SIZE), IPPROTO_UDP);
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buildIpHeader(spoofedSourceAddress, receivedSourceAddress, (char*)packet);
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if (sendto(sockfd, packet, sizeof(packet), 0x0, (struct sockaddr*)&packetTo, sizeof(packetTo)) < 0) {
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fprintf(stderr, "Packet Send Failed.");
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exit(1);
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}
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}
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void FakeroutePacket::buildUdpHeader(char* packet, u_int16_t sourcePort,
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u_int16_t destinationPort)
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{
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struct udphdr* udphdr = (struct udphdr*)packet;
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udphdr->source = htons(sourcePort);
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udphdr->dest = htons(destinationPort);
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udphdr->len = htons(UDP_BODY_SIZE);
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}
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void FakeroutePacket::buildIcmpHeader(char* packet, int protocol) {
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struct iphdr *fakeIpHdr;
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struct icmp *icmpHeader = (struct icmp*)packet;
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icmpHeader->icmp_type = getIcmpType();
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icmpHeader->icmp_code = getIcmpCode();
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fakeIpHdr = (struct iphdr*) &icmpHeader->icmp_ip;
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fakeIpHdr->ihl = 5;
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fakeIpHdr->version = 4;
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fakeIpHdr->protocol = protocol;
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fakeIpHdr->saddr = inet_addr(receivedSourceAddress);
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fakeIpHdr->daddr = inet_addr(spoofedDestinationAddress);
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icmpHeader->icmp_cksum = (unsigned short)in_cksum((unsigned short*)packet, ICMP_HDR_SIZE + 8);
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}
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void FakeroutePacket::buildIpHeader(char* source, char* destination, char* packet) {
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struct iphdr *ipHeader;
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ipHeader = (struct iphdr*)packet;
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ipHeader->ihl = 5;
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ipHeader->version = 4;
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ipHeader->tot_len = htons(IP_HDR_SIZE + ICMP_HDR_SIZE);
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ipHeader->id = 31337;
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ipHeader->ttl = 60;
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ipHeader->protocol = IPPROTO_ICMP;
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ipHeader->saddr = inet_addr(source);
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ipHeader->daddr = inet_addr(destination);
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ipHeader->check = (unsigned short)in_cksum((unsigned short*)ipHeader, IP_HDR_SIZE);
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}
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