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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include "logger.h"
#include "pldstr.h"
#include "bytedecoders.h"
#include "olestream-unwrap.h"
#ifdef WIN32
#include "../os_specific/win_mem_alloc.h" /* MALLOC */
#else
#include "../os_specific/sci_mem_alloc.h" /* MALLOC */
#endif
struct OLE10_header{
unsigned char data[6];
char *attach_name;
unsigned char data2[8];
char *fname_1;
char *fname_2;
size_t attach_size;
size_t attach_size_1;
size_t attach_start_offset;
};
/*-----------------------------------------------------------------\
Function Name : OLEUNWRAP_init
Returns Type : int
----Parameter List
1. struct OLEUNWRAP_object *oleuw ,
------------------
Exit Codes :
Side Effects :
--------------------------------------------------------------------
Comments:
--------------------------------------------------------------------
Changes:
\------------------------------------------------------------------*/
int OLEUNWRAP_init( struct OLEUNWRAP_object *oleuw )
{
oleuw->debug = 0;
oleuw->verbose = 0;
oleuw->filename_report_fn = NULL;
return OLEUW_OK;
}
/*-----------------------------------------------------------------\
Function Name : OLEUNWRAP_set_debug
Returns Type : int
----Parameter List
1. struct OLEUNWRAP_object *oleuw,
2. int level ,
------------------
Exit Codes :
Side Effects :
--------------------------------------------------------------------
Comments:
--------------------------------------------------------------------
Changes:
\------------------------------------------------------------------*/
int OLEUNWRAP_set_debug( struct OLEUNWRAP_object *oleuw, int level )
{
oleuw->debug = level;
return OLEUW_OK;
}
/*-----------------------------------------------------------------\
Function Name : OLEUNWRAP_set_verbose
Returns Type : int
----Parameter List
1. struct OLEUNWRAP_object *oleuw,
2. int level ,
------------------
Exit Codes :
Side Effects :
--------------------------------------------------------------------
Comments:
--------------------------------------------------------------------
Changes:
\------------------------------------------------------------------*/
int OLEUNWRAP_set_verbose( struct OLEUNWRAP_object *oleuw, int level )
{
oleuw->verbose = level;
return OLEUW_OK;
}
/*-----------------------------------------------------------------\
Function Name : OLEUNWRAP_set_save_unknown_streams
Returns Type : int
----Parameter List
1. struct OLEUNWRAP_object *oleuw,
2. int level ,
------------------
Exit Codes :
Side Effects :
--------------------------------------------------------------------
Comments:
--------------------------------------------------------------------
Changes:
\------------------------------------------------------------------*/
int OLEUNWRAP_set_save_unknown_streams( struct OLEUNWRAP_object *oleuw, int level )
{
oleuw->save_unknown_streams = level;
return OLEUW_OK;
}
/*-----------------------------------------------------------------\
Function Name : OLEUNWRAP_save_stream
Returns Type : int
----Parameter List
1. char *fname,
2. char *stream,
3. size_t bytes ,
------------------
Exit Codes :
Side Effects :
--------------------------------------------------------------------
Comments:
--------------------------------------------------------------------
Changes:
\------------------------------------------------------------------*/
int OLEUNWRAP_save_stream( struct OLEUNWRAP_object *oleuw, char *fname, char *decode_path, char *stream, size_t bytes )
{
char *full_name;
FILE *f;
int result = 0;
full_name = PLD_dprintf("%s/%s", decode_path, fname );
if (full_name == NULL)
{
LOGGER_log("%s:%d:OLEUNWRAP_save_stream:ERROR: Unable to create filename string from '%s' and '%s'",FL,fname,decode_path);
return -1;
}
f = fopen(full_name,"wb");
if (f != NULL)
{
size_t write_count;
write_count = fwrite( stream, 1, bytes, f );
if (write_count != bytes)
{
LOGGER_log("%s:%d:OLEUNWRAP_save_stream:WARNING: Only wrote %d of %d bytes to file %s\n",FL, write_count, bytes, full_name );
/* Complaining seems to get us segfaulted*/
}
fclose(f);
} else {
LOGGER_log("%s:%d:OLEUNWRAP_save_stream:ERROR: Unable to open %s for writing (%s)\n",FL,full_name, strerror(errno));
result = -1;
}
if (full_name) FREE(full_name);
return result;
}
/*-----------------------------------------------------------------\
Function Name : OLEUNWRAP_decode_attachment
Returns Type : int
----Parameter List
1. char *stream ,
------------------
Exit Codes :
Side Effects :
--------------------------------------------------------------------
Comments:
--------------------------------------------------------------------
Changes:
\------------------------------------------------------------------*/
int OLEUNWRAP_decode_attachment( struct OLEUNWRAP_object *oleuw, char *stream, size_t stream_size, char *decode_path )
{
struct OLE10_header oh;
char *sp = stream;
char *data_start_point = stream;
int result = OLEUW_OK;
/* Get the data size*/
oh.attach_size_1 = (size_t)get_4byte_value( sp );
sp += 4;
/* fprintf(stdout,"%s:%d:DEBUG:attachsize = %d, stream length = %d\n", FL, oh.attach_size_1, stream_size );*/
oh.attach_start_offset = (stream_size -oh.attach_size_1);
data_start_point = stream +oh.attach_start_offset;
/*if (oh.attach_start_offset == 4)*/
if (oh.attach_start_offset < 4)
{
/* If we only had the stream byte-lenght in our header*/
/* then we know we don't have a complex header.*/
oh.attach_name = PLD_dprintf("unknown-%ld",oh.attach_size_1);
oh.attach_size = oh.attach_size_1;
} else {
/* Unknown memory segment*/
memcpy( oh.data, sp, 2 );
sp += 2;
/* Full attachment string*/
oh.attach_name = strdup( sp );
sp = sp + strlen(oh.attach_name) +1;
/* Attachment full path*/
oh.fname_1 = strdup( sp );
sp += strlen(oh.fname_1) +1;
/* Unknown memory segment*/
memcpy( oh.data2, sp, 8 );
sp = sp +8;
/* Attachment full path*/
oh.fname_2 = strdup( sp );
sp += strlen(oh.fname_2) +1;
oh.attach_size = (size_t)get_4byte_value( sp );
sp += 4;
if (oh.attach_size > stream_size) oh.attach_size = stream_size;
}
if (oleuw->debug > 0) LOGGER_log("%s:%d:OLEUNWRAP_decode_attachment:DEBUG: Attachment %s:%s:%s size = %d\n",FL, oh.attach_name, oh.fname_1, oh.fname_2, oh.attach_size );
result = OLEUNWRAP_save_stream( oleuw, oh.attach_name, decode_path, data_start_point, oh.attach_size );
if (result == OLEUW_OK)
{
if (oleuw->debug > 0) LOGGER_log("%s:%d:OLEUNWRAP_decode_attachment:DEBUG: Calling reporter for the filename",FL);
if ((oleuw->verbose > 0)&&(oleuw->filename_report_fn != NULL))
{
oleuw->filename_report_fn(oh.attach_name);
}
/* Do call back to reporting function*/
}
/* Clean up our previously allocated data*/
if (oh.fname_1 != NULL) FREE(oh.fname_1);
if (oh.attach_name != NULL) FREE(oh.attach_name);
if (oh.fname_2 != NULL) FREE(oh.fname_2);
return OLEUW_OK;
}
/*-----------------------------------------------------------------\
Function Name : OLEUNWRAP_decodestream
Returns Type : int
----Parameter List
1. char *element_string,
2. char *stream ,
------------------
Exit Codes :
Side Effects :
--------------------------------------------------------------------
Comments:
--------------------------------------------------------------------
Changes:
\------------------------------------------------------------------*/
int OLEUNWRAP_decodestream( struct OLEUNWRAP_object *oleuw, char *element_string, char *stream, size_t stream_size, char *decode_path )
{
int result = OLEUW_OK;
if (strstr(element_string, OLEUW_ELEMENT_10NATIVE_STRING) != NULL)
{
OLEUNWRAP_decode_attachment( oleuw, stream, stream_size, decode_path );
} else {
if (oleuw->debug) LOGGER_log("Unable to decode stream with element string '%s'\n", element_string);
result = OLEUW_STREAM_NOT_DECODED;
}
return result;
}
/*-----------------------------------------------------------------\
Function Name : OLEUNWRAP_set_filename_report_fn
Returns Type : int
----Parameter List
1. struct OLEUNWRAP_object *oleuw,
2. int (*ptr_to_fn)(char *) ,
------------------
Exit Codes :
Side Effects :
--------------------------------------------------------------------
Comments:
--------------------------------------------------------------------
Changes:
\------------------------------------------------------------------*/
int OLEUNWRAP_set_filename_report_fn( struct OLEUNWRAP_object *oleuw, int (*ptr_to_fn)(char *) )
{
oleuw->filename_report_fn = ptr_to_fn;
return 0;
}
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