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utils.cy
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(function(utils) {
// Load C functions declared in utils.loadFuncs
var shouldLoadCFuncs = true;
// Expose the C functions to cycript's global scope
var shouldExposeCFuncs = true;
// Expose C constants to cycript's global scope
var shouldExposeConsts = true;
// Expose functions defined here to cycript's global scope
var shouldExposeFuncs = true;
// Which functions to expose
var funcsToExpose = ["exec", "include", "sizeof", "logify", "apply", "str2voidPtr", "voidPtr2str", "double2voidPtr", "voidPtr2double", "isMemoryReadable", "isObject", "makeStruct"];
// C functions that utils.loadFuncs loads
var CFuncsDeclarations = [
// <stdlib.h>
"void *calloc(size_t num, size_t size)",
// <string.h>
"char *strcpy(char *restrict dst, const char *restrict src)",
"char *strdup(const char *s1)",
"void* memset(void* dest, int ch, size_t count)",
// <stdio.h>
"FILE *fopen(const char *, const char *)",
"int fclose(FILE *)",
"size_t fread(void *restrict, size_t, size_t, FILE *restrict)",
"size_t fwrite(const void *restrict, size_t, size_t, FILE *restrict)",
// <mach.h>
"mach_port_t mach_task_self()",
"kern_return_t task_for_pid(mach_port_name_t target_tport, int pid, mach_port_name_t *tn)",
"kern_return_t mach_vm_protect(vm_map_t target_task, mach_vm_address_t address, mach_vm_size_t size, boolean_t set_maximum, vm_prot_t new_protection)",
"kern_return_t mach_vm_write(vm_map_t target_task, mach_vm_address_t address, vm_offset_t data, mach_msg_type_number_t dataCnt)",
"kern_return_t mach_vm_read(vm_map_t target_task, mach_vm_address_t address, mach_vm_size_t size, vm_offset_t *data, mach_msg_type_number_t *dataCnt)",
];
/*
Replacement for eval that can handle @encode etc.
Usage:
cy# utils.exec("@encode(void *(int, char))")
@encode(void*(int,char))
*/
utils.exec = function(str) {
var mkdir = @encode(int (const char *, int))(dlsym(RTLD_DEFAULT, "mkdir"));
var tempnam = @encode(char *(const char *, const char *))(dlsym(RTLD_DEFAULT, "tempnam"));
var fopen = @encode(void *(const char *, const char *))(dlsym(RTLD_DEFAULT, "fopen"));
var fclose = @encode(int (void *))(dlsym(RTLD_DEFAULT, "fclose"));
var fwrite = @encode(int (const char *, int, int, void *))(dlsym(RTLD_DEFAULT, "fwrite"));
var symlink = @encode(int (const char *, const char *))(dlsym(RTLD_DEFAULT, "symlink"));
var unlink = @encode(int (const char *))(dlsym(RTLD_DEFAULT, "unlink"));
var getenv = @encode(const char *(const char *))(dlsym(RTLD_DEFAULT, "getenv"));
var setenv = @encode(int (const char *, const char *, int))(dlsym(RTLD_DEFAULT, "setenv"));
var libdir = "/usr/lib/cycript0.9";
var dir = libdir + "/tmp";
mkdir(dir, 0777);
// This is needed because tempnam seems to ignore the first argument on i386
var old_tmpdir = getenv("TMPDIR");
setenv("TMPDIR", dir, 1);
// No freeing :(
var f = tempnam(dir, "exec-");
setenv("TMPDIR", old_tmpdir, 1);
if(!f) {
return false;
}
symlink(f, f + ".cy");
str = "exports.result = " + str;
var handle = fopen(f, "w");
fwrite(str, str.length, 1, handle);
fclose(handle);
var r;
var except = null;
try {
r = require(f.replace(libdir + "/", ""));
} catch(e) {
except = e;
}
unlink(f + ".cy");
unlink(f);
if(except !== null) {
throw except;
}
return r.result;
};
/*
Applies known typedefs
Used in utils.include and utils.makeStruct
Usage:
cy# utils.applyTypedefs("mach_vm_address_t")
"uint64_t"
*/
utils.applyTypedefs = function(str) {
var typedefs = {
"struct": "",
"restrict": "",
"FILE": "void",
"size_t": "uint64_t",
"uintptr_t": "unsigned long",
"kern_return_t": "int",
"mach_port_t": "unsigned int",
"mach_port_name_t": "unsigned int",
"vm_offset_t": "unsigned long",
"vm_size_t": "unsigned long",
"mach_vm_address_t": "uint64_t",
"mach_vm_offset_t": "uint64_t",
"mach_vm_size_t": "uint64_t",
"vm_map_offset_t": "uint64_t",
"vm_map_address_t": "uint64_t",
"vm_map_size_t": "uint64_t",
"mach_port_context_t": "uint64_t",
"vm_map_t": "unsigned int",
"boolean_t": "unsigned int",
"vm_prot_t": "int",
"mach_msg_type_number_t": "unsigned int",
"cpu_type_t": "int",
"cpu_subtype_t": "int",
"cpu_threadtype_t": "int",
};
for(var k in typedefs) {
str = str.replace(new RegExp("(\\s|\\*|,|\\(|^)" + k + "(\\s|\\*|,|\\)|$)", "g"), "$1" + typedefs[k] + "$2");
}
return str;
};
/*
Parses a C function declaration and returns the function name and cycript type
If load is true, tries to load it into cycript using utils.exec
Usage:
cy# var str = "void *calloc(size_t num, size_t size)";
"void *calloc(size_t num, size_t size)"
cy# utils.include(str)
["calloc","@encode(void *(uint64_t num, uint64_t size))(140735674376857)"]
cy# var ret = utils.include(str, true)
["calloc",0x7fff93e0e299]
cy# ret[1].type
@encode(void*(unsigned long long int,unsigned long long int))
cy# ret[1](100, 1)
0x100444100
*/
utils.include = function(str, load) {
var re = /^\s*([^(]*(?:\s+|\*))(\w*)\s*\(([^)]*)\)\s*;?\s*$/;
var match = re.exec(str);
if(!match) {
return -1;
}
var rType = utils.applyTypedefs(match[1]);
var name = match[2];
var args = match[3];
var argsRe = /([^,]+)(?:,|$)/g;
var argsTypes = [];
while((match = argsRe.exec(args)) !== null) {
var type = utils.applyTypedefs(match[1]);
argsTypes.push(type);
}
var encodeString = "@encode(";
encodeString += rType + "(";
encodeString += argsTypes.join(", ") + "))";
var fun = dlsym(RTLD_DEFAULT, name);
if(fun !== null) {
encodeString += "(" + fun + ")";
if(load) {
return [name, utils.exec(encodeString)];
}
} else if(load) {
throw "Function couldn't be found with dlsym!";
}
return [name, encodeString];
};
/*
Loads the function declaration in the defs array using utils.exec and exposes to cycript's global scope
Is automatically called if shouldLoadCFuncs is true
*/
utils.funcs = {};
utils.loadfuncs = function(expose) {
for(var i = 0; i < CFuncsDeclarations.length; i++) {
try {
var o = utils.include(CFuncsDeclarations[i], true);
utils.funcs[o[0]] = o[1];
if(expose) {
Cycript.all[o[0]] = o[1];
}
} catch(e) {
system.print("Failed to load function: " + i);
try {
system.print(utils.include(CFuncsDeclarations[i]));
} catch(e2) {
}
}
}
};
/*
Calculates the size of a type like the C operator sizeof
Usage:
cy# utils.sizeof(int)
4
cy# utils.sizeof(@encode(void *))
8
cy# utils.sizeof("mach_vm_address_t")
8
*/
utils.sizeof = function(type) {
if(typeof type === "string") {
type = utils.applyTypedefs(type);
type = utils.exec("@encode(" + type + ")");
}
// (const) char * has "infinite" preceision
if(type.toString().slice(-1) === "*") {
return utils.sizeof(@encode(void *));
}
// float and double
if(type.toString() === @encode(float).toString()) {
return 4;
} else if (type.toString() === @encode(double).toString()) {
return 8;
}
var typeInstance = type(0);
if(typeInstance instanceof Object) {
// Arrays
if("length" in typeInstance) {
return typeInstance.length * utils.sizeof(typeInstance.type);
}
// Structs
if(typeInstance.toString() === "[object Struct]") {
var typeStr = type.toString();
var arrayTypeStr = "[2" + typeStr + "]";
var arrayType = new Type(arrayTypeStr);
var arrayInstance = new arrayType;
return @encode(void *)(&(arrayInstance[1])) - @encode(void *)(&(arrayInstance[0]));
}
}
for(var i = 0; i < 5; i++) {
var maxSigned = Math.pow(2, 8 * Math.pow(2, i) - 1) - 1;
if(i === 3) {
// Floating point fix ;^)
maxSigned /= 1000;
}
// can't use !== or sizeof(void *) === 0.5
if(type(maxSigned) != maxSigned) {
return Math.pow(2, i - 1);
}
}
};
/*
Logs a specific message sent to an instance of a class like logify.pl in theos
Requires Cydia Substrate (com.saurik.substrate.MS) and NSLog (org.cycript.NSLog) modules
Returns the old message returned by MS.hookMessage (Note: this is not just the old message!)
Usage:
cy# var oldm = utils.logify(objc_getMetaClass(NSNumber), @selector(numberWithDouble:))
...
cy# var n = [NSNumber numberWithDouble:1.5]
2014-07-28 02:26:39.805 cycript[71213:507] +[<NSNumber: 0x10032d0c4> numberWithDouble:1.5]
2014-07-28 02:26:39.806 cycript[71213:507] = 1.5
@1.5
*/
utils.logify = function(cls, sel) {
@import com.saurik.substrate.MS;
@import org.cycript.NSLog;
var oldm = {};
MS.hookMessage(cls, sel, function() {
var args = [].slice.call(arguments);
var selFormat = sel.toString().replace(/:/g, ":%@ ").trim();
var logFormat = "%@[<%@: 0x%@> " + selFormat + "]";
var standardArgs = [logFormat, class_isMetaClass(cls)? "+": "-", cls.toString(), (&this).valueOf().toString(16)];
var logArgs = standardArgs.concat(args);
NSLog.apply(null, logArgs);
var r = oldm->apply(this, arguments);
if(r !== undefined) {
NSLog(" = %@", r);
}
return r;
}, oldm);
return oldm;
};
/*
Calls a C function by providing its name and arguments
Doesn't support structs
Return value is always a void pointer
Usage:
cy# utils.apply("printf", ["%s %.3s, %d -> %c, float: %f\n", "foo", "barrrr", 97, 97, 1.5])
foo bar, 97 -> a, float: 1.500000
0x22
*/
utils.apply = function(fun, args) {
if(!(args instanceof Array)) {
throw "Args needs to be an array!";
}
var argc = args.length;
var voidPtr = @encode(void *);
var argTypes = [];
for(var i = 0; i < argc; i++) {
var argType = voidPtr;
var arg = args[i];
if(typeof arg === "string") {
argType = @encode(char *);
}
if(typeof arg === "number" && arg % 1 !== 0) {
argType = @encode(double);
}
argTypes.push(argType);
}
var type = voidPtr.functionWith.apply(voidPtr, argTypes);
if(typeof fun === "string") {
fun = dlsym(RTLD_DEFAULT, fun);
}
if(!fun) {
throw "Function not found!";
}
return type(fun).apply(null, args);
};
/*
Converts a string (char *) to a void pointer (void *)
You can't cast to strings to void pointers and vice versa in cycript. Blame saurik.
Usage:
cy# var voidPtr = utils.str2voidPtr("foobar")
0x100331590
cy# utils.voidPtr2str(voidPtr)
"foobar"
*/
utils.str2voidPtr = function(str) {
var strdup = @encode(void *(char *))(dlsym(RTLD_DEFAULT, "strdup"));
return strdup(str);
};
/*
The inverse function of str2voidPtr
*/
utils.voidPtr2str = function(voidPtr) {
var strdup = @encode(char *(void *))(dlsym(RTLD_DEFAULT, "strdup"));
return strdup(voidPtr);
};
/*
Converts a double into a void pointer
This can be used to view the binary representation of a floating point number
Usage:
cy# var n = utils.double2voidPtr(-1.5)
0xbff8000000000000
cy# utils.voidPtr2double(n)
-1.5
*/
utils.double2voidPtr = function(n) {
var doublePtr = new double;
*doublePtr = n;
var voidPtrPtr = @encode(void **)(doublePtr);
return *voidPtrPtr;
};
/*
The inverse function of double2voidPtr
*/
utils.voidPtr2double = function(voidPtr) {
var voidPtrPtr = new @encode(void **);
*voidPtrPtr = voidPtr;
var doublePtr = @encode(double *)(voidPtrPtr);
return *doublePtr;
};
/*
Determines in a safe way if a memory location is readable
Usage:
cy# utils.isMemoryReadable(0)
false
cy# utils.isMemoryReadable(0x1337)
false
cy# utils.isMemoryReadable(NSObject)
true
cy# var a = malloc(100); utils.isMemoryReadable(a)
true
*/
utils.isMemoryReadable = function(ptr) {
if(typeof ptr === "string") {
return true;
}
var fds = new @encode(int [2]);
utils.apply("pipe", [fds]);
var result = utils.apply("write", [fds[1], ptr, 1]) == 1;
utils.apply("close", [fds[0]]);
utils.apply("close", [fds[1]]);
return result;
};
/*
Determines in a safe way if the memory location contains an Objective-C object
Usage:
cy# utils.isObject(0)
false
cy# utils.isObject(0x1337)
false
cy# utils.isObject(NSObject)
true
cy# utils.isObject(objc_getMetaClass(NSObject))
true
cy# utils.isObject([new NSObject init])
true
cy# var a = malloc(100); utils.isObject(a)
false
cy# *@encode(void **)(a) = NSObject; utils.isObject(a)
true
*/
utils.isObject = function(obj) {
obj = @encode(void *)(obj);
var lastObj = -1;
function objc_isa_ptr(obj) {
// See http://www.sealiesoftware.com/blog/archive/2013/09/24/objc_explain_Non-pointer_isa.html
var objc_debug_isa_class_mask = 0x00000001fffffffa;
obj = (obj & 1)? (obj & objc_debug_isa_class_mask): obj;
if((obj & (utils.sizeof(@encode(void *)) - 1)) != 0) {
return null;
} else {
return obj;
}
}
function ptrValue(obj) {
return obj? obj.valueOf(): null;
}
var foundMetaClass = false;
for(obj = objc_isa_ptr(obj); utils.isMemoryReadable(obj); ) {
obj = *@encode(void **)(obj);
if(ptrValue(obj) == ptrValue(lastObj)) {
foundMetaClass = true;
break;
}
lastObj = obj;
}
if(!foundMetaClass) {
return false;
}
if(lastObj === -1 || lastObj === null) {
return false;
}
var obj_class = objc_isa_ptr(@encode(void **)(obj)[1]);
if(!utils.isMemoryReadable(obj_class)) {
return false;
}
var metaclass = objc_isa_ptr(@encode(void **)(obj_class)[0]);
var superclass = objc_isa_ptr(@encode(void **)(obj_class)[1]);
return ptrValue(obj) == ptrValue(metaclass) && superclass == null;
};
/*
Creates a cycript struct type from a C struct definition
Usage:
cy# var foo = makeStruct("int a; short b; char c; uint64_t d; double e;", "foo");
@encode(foo)
cy# var f = new foo
&{a:0,b:0,c:0,d:0,e:0}
cy# f->a = 100; f
&{a:100,b:0,c:0,d:0,e:0}
cy# *@encode(int *)(f)
100
*/
utils.makeStruct = function(str, name) {
var fieldRe = /(?:\s|\n)*([^;]+\s*(?:\s|\*))([^;]+)\s*;/g;
if(!name) {
name = "struct" + Math.floor(Math.random() * 100000);
}
var typeStr = "{" + name + "=";
while((match = fieldRe.exec(str)) !== null) {
var fieldType = utils.applyTypedefs(match[1]);
var fieldName = match[2];
var encodedType = utils.exec("@encode(" + fieldType + ")").toString();
typeStr += '"' + fieldName + '"' + encodedType;
}
typeStr += "}";
return new Type(typeStr);
};
// Various constants
utils.constants = {
VM_PROT_NONE: 0x0,
VM_PROT_READ: 0x1,
VM_PROT_WRITE: 0x2,
VM_PROT_EXECUTE: 0x4,
VM_PROT_NO_CHANGE: 0x8,
VM_PROT_COPY: 0x10,
VM_PROT_WANTS_COPY: 0x10,
VM_PROT_IS_MASK: 0x40,
};
var c = utils.constants;
c.VM_PROT_DEFAULT = c.VM_PROT_READ | c.VM_PROT_WRITE;
c.VM_PROT_ALL = c.VM_PROT_READ | c.VM_PROT_WRITE | c.VM_PROT_EXECUTE;
if(shouldExposeConsts) {
for(var k in c) {
Cycript.all[k] = c[k];
}
}
if(shouldExposeFuncs) {
for(var i = 0; i < funcsToExpose.length; i++) {
var name = funcsToExpose[i];
Cycript.all[name] = utils[name];
}
}
if(shouldLoadCFuncs) {
utils.loadfuncs(shouldExposeCFuncs);
}
})(exports);