modules/com/saurik/substrate/MS.cy

   1 /* Cydia Substrate - Powerful Code Insertion Platform
   2  * Copyright (C) 2008-2015  Jay Freeman (saurik)
   3 */
   4
   5 (function(exports) {
   6
   7 var libcycript = dlopen("/usr/lib/libcycript.dylib", RTLD_NOLOAD);
   8 if (libcycript == null) {
   9     exports.error = dlerror();
  10     return;
  11 }
  12
  13 var CYHandleServer = dlsym(libcycript, "CYHandleServer");
  14 if (CYHandleServer == null) {
  15     exports.error = dlerror();
  16     return;
  17 }
  18
  19 var info = new Dl_info;
  20 if (dladdr(CYHandleServer, info) == 0) {
  21     exports.error = dlerror();
  22     return;
  23 }
  24
  25 var path = info->dli_fname;
  26 var slash = path.lastIndexOf('/');
  27 if (slash == -1)
  28     return;
  29
  30 var libsubstrate = dlopen(path.substr(0, slash) + "/libsubstrate.dylib", RTLD_GLOBAL | RTLD_LAZY);
  31 if (libsubstrate == null) {
  32     exports.error = dlerror();
  33     return;
  34 }
  35
  36 MSGetImageByName = @encode(void *(const char *))(dlsym(libsubstrate, "MSGetImageByName"));
  37 MSFindSymbol = @encode(void *(void *, const char *))(dlsym(libsubstrate, "MSFindSymbol"));
  38 MSHookFunction = @encode(void(void *, void *, void **))(dlsym(libsubstrate, "MSHookFunction"));
  39 MSHookMessageEx = @encode(void(Class, SEL, void *, void **))(dlsym(libsubstrate, "MSHookMessageEx"));
  40
  41 var slice = [].slice;
  42
  43 exports.getImageByName = MSGetImageByName;
  44 exports.findSymbol = MSFindSymbol;
  45
  46 exports.hookFunction = function(func, hook, old) {
  47     var type = typeid(func);
  48
  49     var pointer;
  50     if (old == null || typeof old === "undefined")
  51         pointer = null;
  52     else {
  53         pointer = new @encode(void **);
  54         *old = function() { return type(*pointer).apply(null, arguments); };
  55     }
  56
  57     MSHookFunction(func.valueOf(), type(hook), pointer);
  58 };
  59
  60 exports.hookMessage = function(isa, sel, imp, old) {
  61     var type = sel.type(isa);
  62
  63     var pointer;
  64     if (old == null || typeof old === "undefined")
  65         pointer = null;
  66     else {
  67         pointer = new @encode(void **);
  68         *old = function() { return type(*pointer).apply(null, [this, sel].concat(slice.call(arguments))); };
  69     }
  70
  71     MSHookMessageEx(isa, sel, type(function(self, sel) { return imp.apply(self, slice.call(arguments, 2)); }), pointer);
  72 };
  73
  74 })(exports);