Get args from manpages for auto-generated tracer

src/frida/tracer.py

@@ -5,6 +5,7 @@ import fnmatch
 import time
 import re
 import binascii
+import subprocess
 
 from frida.core import ModuleFunction
 
@@ -308,6 +309,30 @@ class Repository(object):
             self._on_update_callback(function, handler, source)
 
     def _create_stub_handler(self, function):
+        args = ""
+        argc = 0
+        varargs = False
+        try:
+            output = subprocess.check_output(["man", "-P", "col -b", "2", function.name], stderr=subprocess.DEVNULL)
+            match = re.search(r"^SYNOPSIS(?:.|\n)*?((?:^.+$\n)* {5}" + function.name + r"\(.*\n(^.+$\n)*)(?:.|\n)*^DESCRIPTION", output.decode(), re.MULTILINE)
+            if match:
+                decl = match.group(1)
+                for argm in re.finditer(r"([^* ]*)\s*(,|\))", decl):
+                    arg = argm.group(1)
+                    if arg == '...':
+                        args += '+ ", ..."'
+                        varargs = True
+                        continue
+
+                    args += '%(pre)s%(arg)s=" + args[%(argc)s]' % {"arg": arg, "argc": argc, "pre": '"' if argc == 0 else '+ ", '}
+                    argc += 1
+
+        except subprocess.CalledProcessError:
+            pass
+
+        if args == "":
+            args = '""'
+
         return """\
 /*
  * Auto-generated by Frida. Please modify to match the signature of %(name)s.
@@ -332,7 +357,7 @@ class Repository(object):
      * use "this" which is an object for keeping state local to an invocation.
      */
     onEnter: function onEnter(log, args, state) {
-        log("%(name)s()");
+        log("%(name)s(" + %(args)s + ")");
     },
 
     /**
@@ -348,7 +373,7 @@ class Repository(object):
     onLeave: function onLeave(log, retval, state) {
     }
 }
-""" % { 'name': function.name }
+""" % { "name": function.name, "args": args }
 
 class MemoryRepository(Repository):
     def __init__(self):