Tweak.xm

   1 /* Cydia Substrate - Powerful Code Insertion Platform
   2  * Copyright (C) 2008-2013  Jay Freeman (saurik)
   3 */
   4
   5 /* GNU Lesser General Public License, Version 3 {{{ */
   6 /*
   7  * Substrate is free software: you can redistribute it and/or modify it under
   8  * the terms of the GNU Lesser General Public License as published by the
   9  * Free Software Foundation, either version 3 of the License, or (at your
  10  * option) any later version.
  11  *
  12  * Substrate is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  15  * License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public License
  18  * along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
  19 **/
  20 /* }}} */
  21
  22 #import <CoreFoundation/CoreFoundation.h>
  23 #import <Foundation/Foundation.h>
  24 #import <CoreGraphics/CGGeometry.h>
  25 #import <UIKit/UIKit.h>
  26
  27 #include <substrate.h>
  28
  29 Class $SafeModeAlertItem;
  30
  31 @interface SBAlertItem : NSObject {
  32 }
  33 - (UIAlertView *) alertSheet;
  34 - (void) dismiss;
  35 @end
  36
  37 @interface SBAlertItemsController : NSObject {
  38 }
  39 + (SBAlertItemsController *) sharedInstance;
  40 - (void) activateAlertItem:(SBAlertItem *)item;
  41 @end
  42
  43 @interface SBStatusBarTimeView : UIView {
  44 }
  45 - (id) textFont;
  46 @end
  47
  48 @interface UIApplication (CydiaSubstrate)
  49 - (void) applicationOpenURL:(id)url;
  50 @end
  51
  52 @interface UIAlertView (CydiaSubstrate)
  53 - (void) setForceHorizontalButtonsLayout:(BOOL)force;
  54 - (void) setBodyText:(NSString *)body;
  55 - (void) setNumberOfRows:(NSInteger)rows;
  56 @end
  57
  58 void SafeModeButtonClicked(int button) {
  59     switch (button) {
  60         case 1:
  61         break;
  62
  63         case 2:
  64             if (kCFCoreFoundationVersionNumber >= 700)
  65                 system("killall backboardd");
  66             else
  67                 // XXX: there are better ways of restarting SpringBoard that would actually save state
  68                 exit(0);
  69         break;
  70
  71         case 3:
  72             [[UIApplication sharedApplication] applicationOpenURL:[NSURL URLWithString:@"http://cydia.saurik.com/safemode/"]];
  73         break;
  74     }
  75 }
  76
  77 void SafeModeAlertItem$alertSheet$buttonClicked$(id self, SEL sel, id sheet, int button) {
  78     SafeModeButtonClicked(button);
  79     [self dismiss];
  80 }
  81
  82 void SafeModeAlertItem$alertView$clickedButtonAtIndex$(id self, SEL sel, id sheet, NSInteger button) {
  83     SafeModeButtonClicked(button + 1);
  84     [self dismiss];
  85 }
  86
  87 void SafeModeAlertItem$configure$requirePasscodeForActions$(id self, SEL sel, BOOL configure, BOOL require) {
  88     UIAlertView *sheet([self alertSheet]);
  89
  90     [sheet setDelegate:self];
  91     [sheet setTitle:@""];
  92     [sheet setBodyText:@"We apologize for the inconvenience, but SpringBoard has just crashed.\n\nMobileSubstrate /did not/ cause this problem: it has protected you from it.\n\nYour device is now running in Safe Mode. All extensions that support this safety system are disabled.\n\nReboot (or restart SpringBoard) to return to the normal mode. To return to this dialog touch the status bar.\n\nTap \"Help\" below for more tips."];
  93     [sheet addButtonWithTitle:@"OK"];
  94     [sheet addButtonWithTitle:@"Restart"];
  95     [sheet addButtonWithTitle:@"Help"];
  96     [sheet setNumberOfRows:1];
  97
  98     if ([sheet respondsToSelector:@selector(setForceHorizontalButtonsLayout:)])
  99         [sheet setForceHorizontalButtonsLayout:YES];
 100 }
 101
 102 void SafeModeAlertItem$performUnlockAction(id self, SEL sel) {
 103     [[%c(SBAlertItemsController) sharedInstance] activateAlertItem:self];
 104 }
 105
 106 static void MSAlert() {
 107     if ($SafeModeAlertItem == nil)
 108         $SafeModeAlertItem = objc_lookUpClass("SafeModeAlertItem");
 109     if ($SafeModeAlertItem == nil) {
 110         $SafeModeAlertItem = objc_allocateClassPair(objc_getClass("SBAlertItem"), "SafeModeAlertItem", 0);
 111         if ($SafeModeAlertItem == nil)
 112             return;
 113
 114         class_addMethod($SafeModeAlertItem, @selector(alertSheet:buttonClicked:), (IMP) &SafeModeAlertItem$alertSheet$buttonClicked$, "v@:@i");
 115         class_addMethod($SafeModeAlertItem, @selector(alertView:clickedButtonAtIndex:), (IMP) &SafeModeAlertItem$alertView$clickedButtonAtIndex$, "v@:@i");
 116         class_addMethod($SafeModeAlertItem, @selector(configure:requirePasscodeForActions:), (IMP) &SafeModeAlertItem$configure$requirePasscodeForActions$, "v@:cc");
 117         class_addMethod($SafeModeAlertItem, @selector(performUnlockAction), (IMP) SafeModeAlertItem$performUnlockAction, "v@:");
 118         objc_registerClassPair($SafeModeAlertItem);
 119     }
 120
 121     if (%c(SBAlertItemsController) != nil)
 122         [[%c(SBAlertItemsController) sharedInstance] activateAlertItem:[[[$SafeModeAlertItem alloc] init] autorelease]];
 123 }
 124
 125
 126 // XXX: on iOS 5.0, we really would prefer avoiding
 127
 128 %hook SBStatusBar
 129 - (void) touchesEnded:(id)touches withEvent:(id)event {
 130     MSAlert();
 131     %orig(touches, event);
 132 } %end
 133
 134 %hook SBStatusBar
 135 - (void) mouseDown:(void *)event {
 136     MSAlert();
 137     %orig(event);
 138 } %end
 139
 140 %hook UIStatusBar
 141 - (void) touchesBegan:(void *)touches withEvent:(void *)event {
 142     MSAlert();
 143     %orig(touches, event);
 144 } %end
 145
 146
 147 // this fairly complex code came from Grant, to solve the "it Safe Mode"-in-bar bug
 148
 149 %hook SBStatusBarDataManager
 150 - (void) _updateTimeString {
 151     char *_data(&MSHookIvar<char>(self, "_data"));
 152     if (_data == NULL)
 153         return;
 154
 155     Ivar _itemIsEnabled(object_getInstanceVariable(self, "_itemIsEnabled", NULL));
 156     if (_itemIsEnabled == NULL)
 157         return;
 158
 159     Ivar _itemIsCloaked(object_getInstanceVariable(self, "_itemIsCloaked", NULL));
 160     if (_itemIsCloaked == NULL)
 161         return;
 162
 163     size_t enabledOffset(ivar_getOffset(_itemIsEnabled));
 164     size_t cloakedOffset(ivar_getOffset(_itemIsCloaked));
 165     if (enabledOffset >= cloakedOffset)
 166         return;
 167
 168     size_t offset(cloakedOffset - enabledOffset);
 169     char *timeString(_data + offset);
 170     strcpy(timeString, "Exit Safe Mode");
 171 } %end
 172
 173
 174 // this /insanely/ complex code came from that parrot guy... omg this is getting bad
 175
 176 @interface SBStatusBarStateAggregator : NSObject
 177 - (void) _stopTimeItemTimer;
 178 @end
 179
 180 %hook SBStatusBarStateAggregator
 181
 182 - (void) _updateTimeItems {
 183     if ([self respondsToSelector:@selector(_stopTimeItemTimer)])
 184         [self _stopTimeItemTimer];
 185     %orig;
 186 }
 187
 188 - (void) _restartTimeItemTimer {
 189 }
 190
 191 - (void) _resetTimeItemFormatter {
 192     %orig;
 193     if (NSDateFormatter *df = MSHookIvar<NSDateFormatter *>(self, "_timeItemDateFormatter"))
 194         [df setDateFormat:@"'Exit' 'Safe' 'Mode'"];
 195 }
 196
 197 %end
 198
 199
 200 static bool alerted_;
 201
 202 static void AlertIfNeeded() {
 203     if (alerted_)
 204         return;
 205     alerted_ = true;
 206     MSAlert();
 207 }
 208
 209 // iOS 7
 210 %hook SBLockScreenManager
 211 - (void) _finishUIUnlockFromSource:(int)source withOptions:(id)options {
 212     %orig;
 213     AlertIfNeeded();
 214 } %end
 215
 216 // iOS 6
 217 %hook SBAwayController
 218 - (void) _finishUnlockWithSound:(BOOL)sound unlockSource:(int)source isAutoUnlock:(BOOL)is {
 219     %orig;
 220     AlertIfNeeded();
 221 } %end
 222
 223 // iOS 5
 224 %hook SBAwayController
 225 - (void) _unlockWithSound:(BOOL)sound isAutoUnlock:(BOOL)is unlockSource:(int)source {
 226     %orig;
 227     AlertIfNeeded();
 228 } %end
 229
 230 // iOS 4.3 XXX: check lower versions
 231 %hook SBAwayController
 232 - (void) _unlockWithSound:(BOOL)sound isAutoUnlock:(BOOL)is unlockType:(int)type {
 233     %orig;
 234     AlertIfNeeded();
 235 } %end
 236
 237 // -[SBIconController showInfoAlertIfNeeded] explains how to drag icons around the iPhone home screen
 238 // it used to be shown to users when they unlocked their screen for the first time, and happened every unlock
 239 // however, as of iOS 4.3, it got relegated to only appearing once the user installed an app or web clip
 240
 241 %hook SBIconController
 242 - (void) showInfoAlertIfNeeded {
 243     AlertIfNeeded();
 244 } %end
 245
 246
 247 // the icon state, including crazy configurations like Five Icon Dock, is stored in SpringBoard's defaults
 248 // unfortunately, SpringBoard on iOS 2.0 and 2.1 (maybe 2.2 as well) buffer overrun with more than 4 icons
 249 // there is a third party package called IconSupport that remedies this, but not everyone is using it yet
 250
 251 %hook SBButtonBar
 252 - (int) maxIconColumns {
 253     static int max;
 254     if (max == 0) {
 255         max = %orig();
 256         if (NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults])
 257             if (NSDictionary *iconState = [defaults objectForKey:@"iconState"])
 258                 if (NSDictionary *buttonBar = [iconState objectForKey:@"buttonBar"])
 259                     if (NSArray *iconMatrix = [buttonBar objectForKey:@"iconMatrix"])
 260                         if ([iconMatrix count] != 0)
 261                             if (NSArray *row = [iconMatrix objectAtIndex:0]) {
 262                                 int count([row count]);
 263                                 if (max < count)
 264                                     max = count;
 265                             }
 266     } return max;
 267 } %end
 268
 269
 270 %hook SBUIController
 271 - (id) init {
 272     if ((self = %orig()) != nil) {
 273         UIView *&_contentLayer(MSHookIvar<UIView *>(self, "_contentLayer"));
 274         UIView *&_contentView(MSHookIvar<UIView *>(self, "_contentView"));
 275
 276         UIView *layer;
 277         if (&_contentLayer != NULL)
 278             layer = _contentLayer;
 279         else if (&_contentView != NULL)
 280             layer = _contentView;
 281         else
 282             layer = nil;
 283
 284         if (layer != nil)
 285             [layer setBackgroundColor:[UIColor darkGrayColor]];
 286     } return self;
 287 } %end
 288
 289 #define Paper_ "/Library/MobileSubstrate/MobileSafety.png"
 290
 291 %hook SBWallpaperImage
 292 + (id) alloc {
 293     return nil;
 294 } %end
 295
 296 %hook UIImage
 297 + (UIImage *) defaultDesktopImage {
 298     return [UIImage imageWithContentsOfFile:@Paper_];
 299 } %end
 300
 301 %hook SBStatusBarTimeView
 302 - (void) tile {
 303     NSString *&_time(MSHookIvar<NSString *>(self, "_time"));
 304     CGRect &_textRect(MSHookIvar<CGRect>(self, "_textRect"));
 305     if (_time != nil)
 306         [_time release];
 307     _time = [@"Exit Safe Mode" retain];
 308     id font([self textFont]);
 309     CGSize size([_time sizeWithFont:font]);
 310     CGRect frame([self frame]);
 311     _textRect.size = size;
 312     _textRect.origin.x = (frame.size.width - size.width) / 2;
 313     _textRect.origin.y = (frame.size.height - size.height) / 2;
 314 } %end
 315
 316
 317 // notification widgets ("wee apps" or "bulletin board sections") are capable of crashing SpringBoard
 318 // unfortunately, which ones are in use are stored in SpringBoard's defaults, so we need to turn them off
 319
 320 %hook BBSectionInfo
 321 - (BOOL) showsInNotificationCenter {
 322     return NO;
 323 } %end
 324
 325
 326 // we don't want this state persisted back to disk, however: that is just really really irritating
 327
 328 %hook BBServer
 329 - (void) _writeBehaviorOverrides {}
 330 - (void) _writeSectionOrder {}
 331 - (void) _writeClearedSections {}
 332 - (void) _writeSectionInfo {}
 333 %end
 334
 335
 336 // on iOS 6.0, Apple split parts of SpringBoard into a daemon called backboardd, including app launches
 337 // in order to allow safe mode to propogate into applications, we need to then tell backboardd here
 338 // XXX: (all of this should be replaced, however, with per-process launchd-mediated exception handling)
 339
 340 %hook BKSApplicationLaunchSettings
 341 - (void) setEnvironment:(NSDictionary *)original {
 342     if (original == nil)
 343         return %orig(nil);
 344
 345     NSMutableDictionary *modified([original mutableCopy]);
 346     [modified setObject:@"1" forKey:@"_MSSafeMode"];
 347     return %orig(modified);
 348 } %end
 349
 350 %ctor {
 351     NSAutoreleasePool *pool([[NSAutoreleasePool alloc] init]);
 352
 353     // on iOS 6, backboardd is in charge of brightness, and freaks out when SpringBoard restarts :(
 354     // the result is that the device is super dark until we attempt to update the brightness here.
 355
 356     if (kCFCoreFoundationVersionNumber >= 700) {
 357         if (void (*GSEventSetBacklightLevel)(float) = reinterpret_cast<void (*)(float)>(dlsym(RTLD_DEFAULT, "GSEventSetBacklightLevel")))
 358             if (NSMutableDictionary *defaults = [NSMutableDictionary dictionaryWithContentsOfFile:[NSString stringWithFormat:@"%@/Library/Preferences/com.apple.springboard.plist", NSHomeDirectory()]])
 359                 if (NSNumber *level = [defaults objectForKey:@"SBBacklightLevel2"])
 360                     GSEventSetBacklightLevel([level floatValue]);
 361     }
 362
 363     [pool release];
 364 }