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more progress on LANMAGIC

This commit is contained in:
Arisotura 2019-02-24 13:24:42 +01:00
parent 60391a8a1b
commit 7a0c1af30b
1 changed files with 120 additions and 3 deletions
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123
src/libui_sdl/LAN.cpp
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@ -85,6 +85,20 @@ volatile int PCapRXNum;
u16 IPv4ID;
typedef struct
{
u8 DestIP[4];
u16 DestPort;
// 0: unused
// 1: connected
u8 Status;
} TCPSocket;
TCPSocket TCPSocketList[64];
#define LOAD_PCAP_FUNC(sym) \
ptr_##sym = (type_##sym)SDL_LoadFunction(lib, #sym); \
if (!ptr_##sym) return false;
@ -115,6 +129,8 @@ bool Init()
IPv4ID = 1;
memset(TCPSocketList, 0, sizeof(TCPSocketList));
for (int i = 0; PCapLibNames[i]; i++)
{
void* lib = SDL_LoadObject(PCapLibNames[i]);
@ -371,13 +387,13 @@ void DeInit()
}
}
void HandleIncomingIPFrame(u8* data, int len)
bool HandleIncomingIPFrame(u8* data, int len)
{
const u32 serverip = 0x0A404001;
const u32 clientip = 0x0A404010;
if (memcmp(&data[0x1E], PCapAdapterData->IP_v4, 4))
return;
return false;
u8 protocol = data[0x17];
@ -428,6 +444,27 @@ void HandleIncomingIPFrame(u8* data, int len)
{
u32 tcplen = ntohs(*(u16*)&ipheader[2]) - 0x14;
u16 srcport = ntohs(*(u16*)&protoheader[0]);
u16 dstport = ntohs(*(u16*)&protoheader[2]);
u16 flags = ntohs(*(u16*)&protoheader[12]);
// TODO: check if they send a FIN, I guess
int sockid = -1;
for (int i = 0; i < (sizeof(TCPSocketList)/sizeof(TCPSocket)); i++)
{
TCPSocket* sock = &TCPSocketList[i];
if (sock->Status == 1 && !memcmp(&sock->DestIP, &ipheader[12], 4) && sock->DestPort == srcport)
{
sockid = i;
break;
}
}
if (sockid == -1)
{
return true;
}
// TCP checksum
tmp = 0;
*(u16*)&protoheader[16] = 0;
@ -445,6 +482,8 @@ void HandleIncomingIPFrame(u8* data, int len)
tmp ^= 0xFFFF;
*(u16*)&protoheader[16] = htons(tmp);
}
return false;
}
void RXCallback(u_char* blarg, const struct pcap_pkthdr* header, const u_char* data)
@ -463,7 +502,8 @@ void RXCallback(u_char* blarg, const struct pcap_pkthdr* header, const u_char* d
if (ethertype == 0x0800) // IPv4
{
HandleIncomingIPFrame(PCapPacketBuffer, header->len);
if (HandleIncomingIPFrame(PCapPacketBuffer, header->len))
PCapRXNum = 0;
}
}
}
@ -705,6 +745,83 @@ bool HandleIPFrame(u8* data, int len)
{
u32 tcplen = ntohs(*(u16*)&ipheader[2]) - 0x14;
u16 srcport = ntohs(*(u16*)&protoheader[0]);
u16 dstport = ntohs(*(u16*)&protoheader[2]);
u16 flags = ntohs(*(u16*)&protoheader[12]);
if (flags & 0x002) // SYN
{
int sockid = -1;
for (int i = 0; i < (sizeof(TCPSocketList)/sizeof(TCPSocket)); i++)
{
TCPSocket* sock = &TCPSocketList[i];
if (sock->Status == 1 && !memcmp(&sock->DestIP, &ipheader[16], 4) && sock->DestPort == dstport)
{
printf("LANMAGIC: duplicate TCP socket\n");
sockid = i;
break;
}
}
if (sockid == -1)
{
for (int i = 0; i < (sizeof(TCPSocketList)/sizeof(TCPSocket)); i++)
{
TCPSocket* sock = &TCPSocketList[i];
if (sock->Status == 0)
{
sockid = i;
break;
}
}
}
if (sockid == -1)
{
printf("LANMAGIC: !! TCP SOCKET LIST FULL\n");
return true;
}
printf("LANMAGIC: opening TCP socket #%d to %d.%d.%d.%d:%d\n",
sockid,
ipheader[16], ipheader[17], ipheader[18], ipheader[19],
dstport);
// keep track of it
// (TODO: also keep track of source port?)
TCPSocket* sock = &TCPSocketList[sockid];
sock->Status = 1;
memcpy(sock->DestIP, &ipheader[16], 4);
sock->DestPort = dstport;
}
else
{
int sockid = -1;
for (int i = 0; i < (sizeof(TCPSocketList)/sizeof(TCPSocket)); i++)
{
TCPSocket* sock = &TCPSocketList[i];
if (sock->Status == 1 && !memcmp(&sock->DestIP, &ipheader[16], 4) && sock->DestPort == dstport)
{
sockid = i;
break;
}
}
if (sockid == -1)
{
printf("LANMAGIC: bad TCP packet\n");
return true;
}
if (flags & 0x001) // FIN
{
// TODO: cleverer termination?
// also timeout etc
TCPSocketList[sockid].Status = 0;
}
}
// TCP checksum
tmp = 0;
*(u16*)&protoheader[16] = 0;