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dynapstalker.py
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dynapstalker.py
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#!/usr/bin/env python
# Read the ASCII log file output from DynamoRIO's drcov utility, converting
# the matched blocks to an IDC script to colorize the blocks in IDA Pro.
#
# Uses code from Pedram Amini's Paimei tool https://github.com/OpenRCE/paimei
# GPLv2 licensed, not by choice but because that's what Pedram used for Paimei
#
# Joshua Wright, josh@wr1ght.net, @joswr1ght
import sys
import re
import pdb
if len(sys.argv) < 4:
print("Usage: %s drcov-log-file process-name output-idc-script [0xrrggbb color]\n" % sys.argv[0])
sys.exit(1)
if len(sys.argv) == 5:
if (len(sys.argv[4]) == 8) and (sys.argv[4][0:2].lower() == "0x"):
color = sys.argv[4]
else:
print("Color code must be RGB formatted, starting with 0x.")
sys.exit(-1)
else:
color = "0x00ffff"
idc = r"""
//
// AUTO-GENERATED BY PAIMEI
// http://www.openrce.org
//
#include <idc.idc>
// convenience wrapper around assign_color_to() that will automatically resolve the 'start' and 'end' arguments with
// the start and end address of the block containing ea.
static assign_block_color_to (ea, color)
{
auto block_start, block_end;
block_start = find_block_start(ea);
block_end = find_block_end(ea);
if (block_start == BADADDR || block_end == BADADDR)
return BADADDR;
assign_color_to(block_start, block_end, color);
}
// the core color assignment routine.
static assign_color_to (start, end, color)
{
auto ea;
if (start != end)
{
for (ea = start; ea < end; ea = NextNotTail(ea))
SetColor(ea, CIC_ITEM, color);
}
else
{
SetColor(start, CIC_ITEM, color);
}
}
// returns address of start of block if found, BADADDR on error.
static find_block_start (current_ea)
{
auto ea, prev_ea;
auto xref_type;
// walk up from current ea.
for (ea = current_ea; ea != BADADDR; ea = PrevNotTail(ea))
{
prev_ea = PrevNotTail(ea);
// if prev_ea is the start of the function, we've found the start of the block.
if (GetFunctionAttr(ea, FUNCATTR_START) == prev_ea)
return prev_ea;
// if there is a code reference *from* prev_ea or *to* ea.
if (Rfirst0(prev_ea) != BADADDR || RfirstB0(ea) != BADADDR)
{
xref_type = XrefType();
// block start found if the code reference was a JMP near or JMP far.
if (xref_type == fl_JN || xref_type == fl_JF)
return ea;
}
}
return BADADDR;
}
// returns address of end of block if found, BADADDR on error.
static find_block_end (current_ea)
{
auto ea, next_ea;
auto xref_type;
// walk down from current ea.
for (ea = current_ea; ea != BADADDR; ea = NextNotTail(ea))
{
next_ea = NextNotTail(ea);
// if next_ea is the start of the function, we've found the end of the block.
if (GetFunctionAttr(ea, FUNCATTR_END) == next_ea)
return next_ea;
// if there is a code reference *from* ea or *to* next_ea.
if (Rfirst0(ea) != BADADDR || RfirstB0(next_ea) != BADADDR)
{
xref_type = XrefType();
// block end found if the code reference was a JMP near or JMP far.
if (xref_type == fl_JN || xref_type == fl_JF)
return next_ea;
}
}
return BADADDR;
}
// return the lower case version of 'str'.
static tolower (str)
{
auto i, c, newstr;
newstr = "";
for (i = 0; i < strlen(str); i++)
{
c = substr(str, i, i + 1);
if (ord(c) >= 0x41 && ord(c) <= 0x5a)
c = form("%s", ord(c) + 32);
newstr = newstr + c;
}
return newstr;
}
// return the blended color between 'oldcolor' and 'newcolor'.
static blend_color (oldcolor, newcolor)
{
auto r, g, b, boldcolor, goldcolor, roldcolor, bnewcolor, gnewcolor, rnewcolor;
boldcolor = (oldcolor & 0xFF0000) >> 16;
goldcolor = (oldcolor & 0x00FF00) >> 8;
roldcolor = (oldcolor & 0x0000FF);
bnewcolor = (newcolor & 0xFF0000) >> 16;
gnewcolor = (newcolor & 0x00FF00) >> 8;
rnewcolor = (newcolor & 0x0000FF);
b = (boldcolor + (bnewcolor - boldcolor) / 2) & 0xFF;
g = (goldcolor + (gnewcolor - goldcolor) / 2) & 0xFF;
r = (roldcolor + (rnewcolor - roldcolor) / 2) & 0xFF;
return (b << 16) + (g << 8) + r;
}
// return the next empty Mark slot
static get_marked_next()
{
auto slot;
slot = 1;
// loop until we find an empty slot
while(GetMarkedPos(slot) != -1)
slot++;
return slot;
}
// executed on script load.
static main()
{
auto color, this_module, next_mark;
this_module = GetInputFile();
next_mark = get_marked_next();
"""
idc += " if (tolower(this_module) == \"%s\") {\n" % sys.argv[2].lower()
idc += "\n color = %s;\n" % color
id = None
i=0
f=open(sys.argv[1])
for line in f:
i+=1
if id == None:
if sys.argv[2].lower() in line.lower():
id, base = line.split(", ")[0:2]
id = int(id)
base = int(base, 16)
else:
continue
# We've already found the block id, skip all other process identifiers
if line[0:7] != "module[":
continue
# If this module id matches, grab the base address and add the IDC script
# line
try:
moduleid = int(re.match("module\[\s+(\d+)\]: ", line).groups()[0])
if moduleid == id:
blockstart = int(re.match("module\[.*\]: (0x[0-9a-f]+),", line).groups()[0], 16)
idc += " " * 8 + "if (GetColor(%s, CIC_ITEM) == DEFCOLOR) assign_block_color_to(%s, color);\n" % (hex(base + blockstart), hex(base + blockstart))
except AttributeError:
print("%d: %s"%(i,line))
f.close()
idc += r"""
}
}
"""
f=open(sys.argv[3], "w")
f.write(idc)
f.close()