From e4277d2dfe5dc53cac218af98c96e7c5cdd6c0df Mon Sep 17 00:00:00 2001
From: Karl Trygve Kalleberg <karltk@boblycat.org>
Date: Sat, 14 Dec 2013 22:33:34 +0100
Subject: [PATCH] Add initial function call tracer implementation

---
 src/tracer.py | 120 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 src/tracer.py

diff --git a/src/tracer.py b/src/tracer.py
new file mode 100644
index 0000000..184b740
--- /dev/null
+++ b/src/tracer.py
@@ -0,0 +1,120 @@
+import fnmatch
+import sys
+
+class TracerProfileBuilder(object):
+    def __init__(self):
+        self._spec = []
+
+    def include_modules(self, *module_name_globs):
+        for m in module_name_globs:
+            self._spec.append(("include", "module", m))
+        return self
+
+    def exclude_modules(self, *module_name_globs):
+        for m in module_name_globs:
+            self._spec.append(("exclude", "module", m))
+        return self
+
+    def include(self, *function_name_globs):
+        for f in function_name_globs:
+            self._spec.append(("include", "function", f))
+        return self
+
+    def exclude(self, *function_name_globs):
+        for f in function_name_globs:
+            self._spec.append(("exclude", "function", f))
+        return self
+
+    def build(self):
+        return TracerProfile(self._spec)
+
+class TracerProfile(object):
+    def __init__(self, spec):
+        self._spec = spec
+
+    def resolve(self, process):
+        all_modules = process.enumerate_modules()
+        working_set = set() # (module, export)
+        for (operation, scope, glob) in self._spec:
+            if scope == "module":
+                if operation == "include":
+                    working_set = working_set.union(self._include_module(glob, all_modules))
+                elif operation == "exclude":
+                    working_set = self._exclude_module(glob, working_set)
+            elif scope == "function":
+                if operation == "include":
+                    working_set = working_set.union(self._include_function(glob, all_modules))
+                elif operation == "exclude":
+                    working_set = self._exclude_function(glob, working_set)
+        return working_set
+
+    def _include_module(self, glob, all_modules):
+        r = []
+        for m in all_modules:
+            if fnmatch.fnmatchcase(m.name, glob):
+                for f in m.enumerate_exports():
+                    r.append((m, f))
+        return r
+
+    def _exclude_module(self, glob, working_set):
+        r = []
+        for module, export in working_set:
+            if not fnmatch.fnmatchcase(module.name, glob):
+                r.append((module, export))
+        return set(r)
+
+    def _include_function(self, glob, all_modules):
+        r = []
+        for m in all_modules:
+            for f in m.enumerate_exports():
+                if fnmatch.fnmatchcase(f.name, glob):
+                    r.append((m, f))
+        return r
+
+    def _exclude_function(self, glob, working_set):
+        r = []
+        for module, export in working_set:
+            if not fnmatch.fnmatchcase(export.name, glob):
+                r.append((module, export))
+        return set(r)
+
+
+class Tracer(object):
+    def __init__(self, profile):
+        self._profile = profile
+        self._script = None
+
+    def start_trace(self, process, sink):
+        def on_message(message, data):
+            sink.on_update([ message['payload'] ])
+
+        working_set = self._profile.resolve(process)
+        source = self._create_trace_script(working_set)
+        self._script = process._session.create_script(source)
+        self._script.on("message", on_message)
+        self._script.load()
+
+    def _create_trace_script(self, working_set):
+        r = []
+        for module, export in working_set:
+            r.append("""
+Interceptor.attach(ptr("0x%x"), {
+    onEnter: function onEnter(args) {
+        send("%s");
+    }
+});""" % (export.address, export.name))
+        return "\n".join(r)
+
+    def end_trace(self):
+        pass
+
+class IOSink(object):
+    def __init__(self, stream):
+        self._stream = stream
+
+    def on_update(self, invocation_events):
+        for ev in invocation_events:
+            self._stream.write(repr(ev) + "\n")
+
+STDOUT_SINK = IOSink(sys.stdout)
+STDERR_SINK = IOSink(sys.stderr)