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/*
* Skype Login
*
* Based on:
* FakeSkype : Skype reverse engineering proof-of-concept client
* Ouanilo MEDEGAN (c) 2006 http://www.oklabs.net
* pyskype : Skype login Python script by uunicorn
*
* Written by: leecher@dose.0wnz.at (c) 2015
*
* Module: Object management functions
*
*/
#include "common.h"
#include "objects.h"
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winsock.h>
#endif
void WriteValue(uchar **BufferAddr, uint Value)
{
uint a;
for (a = Value; a > 0x7F; a >>= 7, (*BufferAddr)++) **BufferAddr = (uchar)a | 0x80;
**BufferAddr = (uchar) a;
(*BufferAddr)++;
}
void ReadValue(uchar **BufferAddr, uint *Value)
{
uint a=0;
uchar c;
for (*Value=0, c=**BufferAddr; a==0 || (c & 0x80); a+=7, (*BufferAddr)++) *Value|=((c=**BufferAddr) & 0x7F) << a;
}
void WriteObject(uchar **Buffer, ObjectDesc Object)
{
int IdxDown, IdxUp;
Object.ObjListInfos.Id = -1;
Object.ObjListInfos.Rank = 0;
WriteValue(Buffer, Object.Family);
WriteValue(Buffer, Object.Id);
switch(Object.Family)
{
case OBJ_FAMILY_NBR:
WriteValue(Buffer, Object.Value.Nbr);
break;
case OBJ_FAMILY_TABLE:
IdxUp = 0;
IdxDown = sizeof(Object.Value.Table) - 1;
while (IdxDown >= 0)
(*Buffer)[IdxDown--] = Object.Value.Table[IdxUp++];
*Buffer += sizeof(Object.Value.Table);
break;
case OBJ_FAMILY_NETADDR:
*(unsigned int *)(*Buffer) = inet_addr(Object.Value.Addr.ip);
*Buffer += 4;
*(unsigned short *)(*Buffer) = htons((u_short)Object.Value.Addr.port);
*Buffer += 2;
break;
case OBJ_FAMILY_BLOB:
WriteValue(Buffer, Object.Value.Memory.MsZ);
memcpy(*Buffer, Object.Value.Memory.Memory, Object.Value.Memory.MsZ);
*Buffer += Object.Value.Memory.MsZ;
break;
case OBJ_FAMILY_STRING:
memcpy(*Buffer, Object.Value.Memory.Memory, Object.Value.Memory.MsZ);
*Buffer += Object.Value.Memory.MsZ;
*(*Buffer) = 0x00;
*Buffer += 1;
break;
case OBJ_FAMILY_INTLIST:
{
uint *IntList;
IdxUp = 0;
IntList = (uint *)Object.Value.Memory.Memory;
WriteValue(Buffer, Object.Value.Memory.MsZ);
while (IdxUp < Object.Value.Memory.MsZ)
{
WriteValue(Buffer, IntList[IdxUp]);
IdxUp++;
}
break;
}
default:
DBGPRINT("WriteObject : Unmanaged Object Family\n");
break;
}
}
int DecodeRawObjects(uchar **Buffer, uint Size, SResponse *Response, ObjectDesc **Objs, int Suffix)
{
int NbObjs, lIdx, IdxUp, IdxDown;
uint Family, Id;
uchar *Str, *Mark;
struct in_addr IP;
ObjectDesc *Object;
static int Idx = 0;
static int Level = 0;
static int CurObjListId = -1;
static uint CurObjListRank = 0;
uint LocalObjListRank;
LocalObjListRank = CurObjListRank;
NbObjs = Family = Id = lIdx = 0;
Mark = *Buffer;
ReadValue(Buffer, &NbObjs);
Level += 1;
if (Level == 1)
Idx += Suffix;
while (lIdx < NbObjs)
{
Family = **Buffer;
*Buffer += 1;
ReadValue(Buffer, &Id);
*Objs = (ObjectDesc *)realloc(*Objs, sizeof(ObjectDesc) * (Idx + 1));
Object = &((*Objs)[Idx]);
Object->Family = Family;
Object->Id = Id;
Object->ObjListInfos.Id = CurObjListId;
Object->ObjListInfos.Rank = LocalObjListRank;
switch (Family)
{
case OBJ_FAMILY_NBR:
ReadValue(Buffer, &(Object->Value.Nbr));
break;
case OBJ_FAMILY_TABLE:
IdxUp = 0;
IdxDown = sizeof(Object->Value.Table) - 1;
while (IdxDown >= 0)
Object->Value.Table[IdxUp++] = (*Buffer)[IdxDown--];
*Buffer += sizeof(Object->Value.Table);
break;
case OBJ_FAMILY_NETADDR:
#ifdef _WIN32
IP.S_un.S_addr = *(unsigned int *)*Buffer;
#else
IP.s_addr = *(unsigned int *)*Buffer;
#endif
memset(Object->Value.Addr.ip, 0, MAX_IP_LEN + 1);
strncpy(Object->Value.Addr.ip, inet_ntoa(IP), MAX_IP_LEN + 1);
*Buffer += 4;
Object->Value.Addr.port = htons(*(unsigned short *)(*Buffer));
*Buffer += 2;
break;
case OBJ_FAMILY_BLOB:
ReadValue(Buffer, &(Object->Value.Memory.MsZ));
Object->Value.Memory.Memory = (uchar *)malloc(Object->Value.Memory.MsZ);
memcpy(Object->Value.Memory.Memory, *Buffer, Object->Value.Memory.MsZ);
*Buffer += Object->Value.Memory.MsZ;
break;
case OBJ_FAMILY_STRING:
Str = *Buffer;
Object->Value.Memory.MsZ = 1;
while (*Str++ != 0)
Object->Value.Memory.MsZ += 1;
Object->Value.Memory.Memory = (uchar *)malloc(Object->Value.Memory.MsZ);
memcpy(Object->Value.Memory.Memory, *Buffer, Object->Value.Memory.MsZ);
*Buffer += Object->Value.Memory.MsZ;
break;
case OBJ_FAMILY_INTLIST:
ReadValue(Buffer, &(Object->Value.Memory.MsZ));
Object->Value.Memory.Memory = (uchar *)malloc(Object->Value.Memory.MsZ * sizeof(uint));
for (IdxUp = 0; IdxUp < Object->Value.Memory.MsZ; IdxUp++)
ReadValue(Buffer, (uint*)(Object->Value.Memory.Memory + (IdxUp * sizeof(uint))));
break;
case OBJ_FAMILY_OBJLIST:
{
uint OldNbObj;
int OldCurObjListId;
OldCurObjListId = CurObjListId;
CurObjListId = (int)Id;
CurObjListRank += 1;
OldNbObj = Response->NbObj;
ManageObjects(Buffer, Size - (*Buffer - Mark), Response);
CurObjListId = OldCurObjListId;
//Suffix += Response->NbObj - OldNbObj;
NbObjs -= 1;
//Idx += (Response->NbObj - OldNbObj);
goto ContinueDecode;
break;
}
default :
break;
}
Idx += 1;
lIdx += 1;
ContinueDecode:
continue ;
}
Level -= 1;
if (Level == 0)
{
Idx = 0;
CurObjListId = -1;
CurObjListRank = 0;
}
return (NbObjs);
}
int ManageObjects(uchar **Buffer, uint Size, SResponse *Response)
{
uchar Mode;
Mode = **Buffer;
*Buffer += 1;
switch (Mode)
{
case RAW_PARAMS:
Response->NbObj += DecodeRawObjects(Buffer, Size - 1, Response, &(Response->Objs), Response->NbObj);
return 0;
case EXT_PARAMS:
// Not supported as not needed by plain login
//Response->NbObj += DecodeExtObjects(Buffer, Size - 1, Response, &(Response->Objs), Response->NbObj);
break;
default:
break;
}
return -1;
}
void FreeResponse(SResponse *Response)
{
uint Idx;
for (Idx=0; Idx<Response->NbObj; Idx++)
{
switch (Response->Objs[Idx].Family)
{
case OBJ_FAMILY_BLOB:
case OBJ_FAMILY_STRING:
case OBJ_FAMILY_INTLIST:
if (Response->Objs[Idx].Value.Memory.Memory) free (Response->Objs[Idx].Value.Memory.Memory);
break;
}
}
free (Response->Objs);
memset(Response, 0, sizeof(SResponse));
}
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