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Create ICMP packets containing valid IP and UDP data

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The encapsulated IP packed was missing source/destination addresses and
the UDP datagram had size 0.
This commit is contained in:
Michele Guerini Rocco 2023-06-17 10:58:05 +02:00
parent e17b206b83
commit 8182ef4335
Signed by: rnhmjoj
GPG Key ID: BFBAF4C975F76450
7 changed files with 27 additions and 14 deletions
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4
src/ConnectionManager.cpp
View File

@ -55,10 +55,10 @@ class FakeroutePacket* ConnectionManager::getPacketFor(char* sourceAddress, char
if (isTransitHop((*entry).getTtl()/3)) {
spoofedPacket = new TimeToLiveExpiredFakeroutePacket(sourcePort, destinationPort,
sourceIp, destinationAddress);
sourceIp, destinationAddress, sourceAddress);
} else {
spoofedPacket = new DestHostUnreachableFakeroutePacket(sourcePort, destinationPort,
sourceIp, destinationAddress);
sourceIp, destinationAddress, sourceAddress);
}
(*entry).incrementTtl(routeCount * 3);

5
src/DestHostUnreachableFakeroutePacket.cpp
View File

@ -33,9 +33,10 @@
DestHostUnreachableFakeroutePacket::DestHostUnreachableFakeroutePacket(u_int16_t localReceivedSourcePort,
u_int16_t localReceivedDestinationPort,
char* localSpoofedSourceAddress,
char* localSpoofedDestinationAddress) :
char* localSpoofedDestinationAddress,
char* localReceivedSourceAddress) :
FakeroutePacket(localReceivedSourcePort, localReceivedDestinationPort,
localSpoofedSourceAddress, localSpoofedDestinationAddress)
localSpoofedSourceAddress, localSpoofedDestinationAddress, localReceivedSourceAddress)
{}
u_int16_t DestHostUnreachableFakeroutePacket::getIcmpType(void) {

2
src/DestHostUnreachableFakeroutePacket.h
View File

@ -41,7 +41,7 @@ class DestHostUnreachableFakeroutePacket : public FakeroutePacket {
public:
DestHostUnreachableFakeroutePacket(u_int16_t receivedSourcePort, u_int16_t receivedDestinationPort,
char* spoofedSourceAddress, char* spoofedDestinationAddress);
char* spoofedSourceAddress, char* spoofedDestinationAddress, char* receivedSourceAddress);
};
#endif

17
src/FakeroutePacket.cpp
View File

@ -46,17 +46,21 @@
FakeroutePacket::FakeroutePacket(u_int16_t localReceivedSourcePort,
u_int16_t localReceivedDestinationPort,
char* localSpoofedSourceAddress,
char* localSpoofedDestinationAddress) :
char* localSpoofedDestinationAddress,
char* localReceivedSourceAddress) :
ICMP_HDR_SIZE(sizeof(struct icmp)),
IP_HDR_SIZE(sizeof(struct iphdr)),
UDP_HDR_SIZE(sizeof(struct udphdr))
{
receivedSourcePort = localReceivedSourcePort;
receivedDestinationPort = localReceivedDestinationPort;
receivedSourceAddress = localReceivedSourceAddress;
spoofedSourceAddress = localSpoofedSourceAddress;
spoofedDestinationAddress = localSpoofedDestinationAddress;
}
FakeroutePacket::~FakeroutePacket() {}
void FakeroutePacket::sendOn(int fd) {
int sockfd;
@ -81,10 +85,10 @@ void FakeroutePacket::sendOn(int fd) {
packetTo.sin_family = AF_INET;
packetTo.sin_addr.s_addr = inet_addr(spoofedDestinationAddress);
buildIpHeader(spoofedSourceAddress, spoofedDestinationAddress, (char*)packet);
buildIcmpHeader((char*)(packet + IP_HDR_SIZE), IPPROTO_UDP);
buildUdpHeader((char*)(packet + IP_HDR_SIZE + ICMP_HDR_SIZE),
receivedSourcePort, receivedDestinationPort);
buildIcmpHeader((char*)(packet + IP_HDR_SIZE), IPPROTO_UDP);
buildIpHeader(spoofedSourceAddress, receivedSourceAddress, (char*)packet);
if (sendto(sockfd, packet, sizeof(packet), 0x0, (struct sockaddr*)&packetTo, sizeof(packetTo)) < 0) {
fprintf(stderr, "Packet Send Failed.");
@ -99,22 +103,25 @@ void FakeroutePacket::buildUdpHeader(char* packet, u_int16_t sourcePort,
udphdr->source = htons(sourcePort);
udphdr->dest = htons(destinationPort);
udphdr->len = htons(UDP_BODY_SIZE);
}
void FakeroutePacket::buildIcmpHeader(char* packet, int protocol) {
struct iphdr *fakeIpHdr;
struct icmp *icmpHeader = (struct icmp*)packet;
char fakePacket[IP_HDR_SIZE];
char fakePacket[IP_HDR_SIZE] = {0};
fakeIpHdr = (struct iphdr*)fakePacket;
fakeIpHdr->ihl = 5;
fakeIpHdr->version = 4;
fakeIpHdr->protocol = protocol;
fakeIpHdr->saddr = inet_addr(receivedSourceAddress);
fakeIpHdr->daddr = inet_addr(spoofedDestinationAddress);
icmpHeader->icmp_type = getIcmpType();
icmpHeader->icmp_code = getIcmpCode();
icmpHeader->icmp_ip = *(struct ip*)fakePacket;
icmpHeader->icmp_cksum = (int)in_cksum((unsigned short*)icmpHeader, ICMP_HDR_SIZE);
icmpHeader->icmp_cksum = (unsigned short)in_cksum((unsigned short*)packet, ICMP_HDR_SIZE + 8);
}
void FakeroutePacket::buildIpHeader(char* source, char* destination, char* packet) {

4
src/FakeroutePacket.h
View File

@ -38,11 +38,13 @@ class FakeroutePacket {
const int ICMP_HDR_SIZE;
const int IP_HDR_SIZE;
const int UDP_HDR_SIZE;
const int UDP_BODY_SIZE = 40;
u_int16_t receivedSourcePort;
u_int16_t receivedDestinationPort;
char* spoofedSourceAddress;
char* spoofedDestinationAddress;
char* receivedSourceAddress;
virtual void buildUdpHeader(char* packet, u_int16_t sourcePort, u_int16_t destinationPort);
virtual void buildIcmpHeader(char* packet, int protocol);
@ -54,7 +56,7 @@ class FakeroutePacket {
public:
FakeroutePacket(u_int16_t receivedSourcePort, u_int16_t receivedDestinationPort,
char* spoofedSourceAddress, char* spoofedDestinationAddress);
char* spoofedSourceAddress, char* spoofedDestinationAddress, char* receivedSourceAddress);
virtual ~FakeroutePacket();
virtual void sendOn(int fd);
};

5
src/TimeToLiveExpiredFakeroutePacket.cpp
View File

@ -34,9 +34,10 @@
TimeToLiveExpiredFakeroutePacket::TimeToLiveExpiredFakeroutePacket(u_int16_t localReceivedSourcePort,
u_int16_t localReceivedDestinationPort,
char* localSpoofedSourceAddress,
char* localSpoofedDestinationAddress) :
char* localSpoofedDestinationAddress,
char* localReceivedSourceAddress) :
FakeroutePacket(localReceivedSourcePort, localReceivedDestinationPort,
localSpoofedSourceAddress, localSpoofedDestinationAddress)
localSpoofedSourceAddress, localSpoofedDestinationAddress, localReceivedSourceAddress)
{}
u_int16_t TimeToLiveExpiredFakeroutePacket::getIcmpType(void) {

4
src/TimeToLiveExpiredFakeroutePacket.h
View File

@ -38,10 +38,12 @@ class TimeToLiveExpiredFakeroutePacket : public FakeroutePacket {
protected:
u_int16_t getIcmpType(void);
u_int16_t getIcmpCode(void);
char* receivedSourceAddress;
public:
TimeToLiveExpiredFakeroutePacket(u_int16_t receivedSourcePort, u_int16_t receivedDestinationPort,
char* spoofedSourceAddress, char* spoofedDestinationAddress);
char* spoofedSourceAddress, char* spoofedDestinationAddress, char* receivedSourceAddress);
};
#endif