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#import <Foundation/Foundation.h>
#import <CoreFoundation/CoreFoundation.h>
#include <dlfcn.h>
extern char ***_NSGetArgv(void);
#define PREFIX "Substitute bundle loader: "
enum test_filters_ret {
PASSED,
FAILED,
INVALID
};
static double id_to_double(id o) {
if ([o isKindOfClass:[NSString class]]) {
NSScanner *scan = [NSScanner scannerWithString:o];
double d;
if (![scan scanDouble:&d] || !scan.atEnd)
return NAN;
return d;
} else if ([o isKindOfClass:[NSNumber class]]) {
return [o doubleValue];
} else {
return NAN;
}
}
static enum test_filters_ret test_filters(NSDictionary *plist_dict) {
NSDictionary *filter = [plist_dict objectForKey:@"Filter"];
if (!filter)
return PASSED;
if (![filter isKindOfClass:[NSDictionary class]])
return INVALID;
for (NSString *key in [filter allKeys]) {
if (!([key isEqualToString:@"CoreFoundationVersion"] ||
[key isEqualToString:@"Classes"] ||
[key isEqualToString:@"Bundles"] ||
[key isEqualToString:@"Executables"])) {
return INVALID;
}
}
NSArray *cfv = [filter objectForKey:@"CoreFoundationVersion"];
if (cfv) {
if (![cfv isKindOfClass:[NSArray class]] ||
[cfv count] == 0 ||
[cfv count] > 2)
return INVALID;
double version = kCFCoreFoundationVersionNumber;
double minimum = id_to_double([cfv objectAtIndex:0]);
if (minimum != minimum)
return INVALID;
if (version < minimum)
return FAILED;
id supremum_o = [cfv objectAtIndex:1];
if (supremum_o) {
double supremum = id_to_double(supremum_o);
if (supremum != supremum)
return INVALID;
if (version >= supremum)
return FAILED;
}
}
NSArray *classes = [filter objectForKey:@"Classes"];
if (classes) {
if (![classes isKindOfClass:[NSArray class]])
return INVALID;
for (NSString *name in classes) {
if (![name isKindOfClass:[NSString class]])
return INVALID;
if (NSClassFromString(name))
goto ok1;
}
return FAILED;
ok1:;
}
NSArray *bundles = [filter objectForKey:@"Bundles"];
if (bundles) {
if (![bundles isKindOfClass:[NSArray class]])
return INVALID;
for (NSString *identifier in bundles) {
if (![identifier isKindOfClass:[NSString class]])
return INVALID;
if ([NSBundle bundleWithIdentifier:identifier])
goto ok2;
}
return FAILED;
ok2:;
}
NSArray *executables = [filter objectForKey:@"Executables"];
if (executables) {
const char *argv0 = (*_NSGetArgv())[0];
NSString *exe = nil;
if (argv0) {
NSString *nsargv0 = [NSString stringWithCString:argv0
encoding:NSUTF8StringEncoding];
exe = [[nsargv0 pathComponents] lastObject];
}
if (!exe)
exe = @"";
if (![executables isKindOfClass:[NSArray class]])
return INVALID;
for (NSString *name in executables) {
if (![name isKindOfClass:[NSString class]])
return INVALID;
if ([name isEqualToString:exe])
goto ok3;
}
return FAILED;
ok3:;
}
return PASSED;
}
/* this is DYLD_INSERT_LIBRARIES'd, not injected. */
__attribute__((constructor))
static void init() {
NSError *err;
NSString *base = @"/Library/Substitute/DynamicLibraries";
NSArray *list = [[NSFileManager defaultManager]
contentsOfDirectoryAtPath:base
error:&err];
if (!list)
return;
for (NSString *dylib in list) {
if (![[dylib pathExtension] isEqualToString:@"dylib"])
continue;
NSString *plist = [[dylib stringByDeletingPathExtension]
stringByAppendingPathExtension:@"plist"];
NSString *full_plist = [base stringByAppendingPathComponent:plist];
NSDictionary *plist_dict = [NSDictionary dictionaryWithContentsOfFile:
full_plist];
if (!plist_dict) {
NSLog(@PREFIX "missing, unreadable, or invalid plist '%@' for dylib '%@'; unlike Substrate, we require plists", full_plist, dylib);
continue;
}
enum test_filters_ret ret = test_filters(plist_dict);
if (ret == FAILED) {
continue;
} else if (ret == INVALID) {
NSLog(@PREFIX "bad data in plist '%@' for dylib '%@'", full_plist, dylib);
continue;
}
NSString *full_dylib = [base stringByAppendingPathComponent:dylib];
const char *c_dylib = [full_dylib cStringUsingEncoding:NSUTF8StringEncoding];
if (!c_dylib) {
NSLog(@PREFIX "Not loading weird dylib path %@", full_dylib);
continue;
}
NSLog(@"Substitute loading %@", full_dylib);
if (!dlopen(c_dylib, RTLD_LAZY)) {
NSLog(@PREFIX "Failed to load %@: %s", full_dylib, dlerror());
}
}
}
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