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 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."];
  92     [sheet addButtonWithTitle:@"OK"];
  93     [sheet addButtonWithTitle:@"Restart"];
  94     [sheet addButtonWithTitle:@"Help"];
  95     [sheet setNumberOfRows:1];
  96
  97     if ([sheet respondsToSelector:@selector(setForceHorizontalButtonsLayout:)])
  98         [sheet setForceHorizontalButtonsLayout:YES];
  99 }
 100
 101 void SafeModeAlertItem$performUnlockAction(id self, SEL sel) {
 102     [[%c(SBAlertItemsController) sharedInstance] activateAlertItem:self];
 103 }
 104
 105 static void MSAlert() {
 106     if ($SafeModeAlertItem == nil)
 107         $SafeModeAlertItem = objc_lookUpClass("SafeModeAlertItem");
 108     if ($SafeModeAlertItem == nil) {
 109         $SafeModeAlertItem = objc_allocateClassPair(objc_getClass("SBAlertItem"), "SafeModeAlertItem", 0);
 110         if ($SafeModeAlertItem == nil)
 111             return;
 112
 113         class_addMethod($SafeModeAlertItem, @selector(alertSheet:buttonClicked:), (IMP) &SafeModeAlertItem$alertSheet$buttonClicked$, "v@:@i");
 114         class_addMethod($SafeModeAlertItem, @selector(alertView:clickedButtonAtIndex:), (IMP) &SafeModeAlertItem$alertView$clickedButtonAtIndex$, "v@:@i");
 115         class_addMethod($SafeModeAlertItem, @selector(configure:requirePasscodeForActions:), (IMP) &SafeModeAlertItem$configure$requirePasscodeForActions$, "v@:cc");
 116         class_addMethod($SafeModeAlertItem, @selector(performUnlockAction), (IMP) SafeModeAlertItem$performUnlockAction, "v@:");
 117         objc_registerClassPair($SafeModeAlertItem);
 118     }
 119
 120     if (%c(SBAlertItemsController) != nil)
 121         [[%c(SBAlertItemsController) sharedInstance] activateAlertItem:[[[$SafeModeAlertItem alloc] init] autorelease]];
 122 }
 123
 124
 125 // XXX: on iOS 5.0, we really would prefer avoiding
 126
 127 %hook SBStatusBar
 128 - (void) touchesEnded:(id)touches withEvent:(id)event {
 129     MSAlert();
 130     %orig(touches, event);
 131 } %end
 132
 133 %hook SBStatusBar
 134 - (void) mouseDown:(void *)event {
 135     MSAlert();
 136     %orig(event);
 137 } %end
 138
 139 %hook UIStatusBar
 140 - (void) touchesBegan:(void *)touches withEvent:(void *)event {
 141     MSAlert();
 142     %orig(touches, event);
 143 } %end
 144
 145
 146 // this fairly complex code came from Grant, to solve the "it Safe Mode"-in-bar bug
 147
 148 %hook SBStatusBarDataManager
 149 - (void) _updateTimeString {
 150     char *_data(&MSHookIvar<char>(self, "_data"));
 151     if (_data == NULL)
 152         return;
 153
 154     Ivar _itemIsEnabled(object_getInstanceVariable(self, "_itemIsEnabled", NULL));
 155     if (_itemIsEnabled == NULL)
 156         return;
 157
 158     Ivar _itemIsCloaked(object_getInstanceVariable(self, "_itemIsCloaked", NULL));
 159     if (_itemIsCloaked == NULL)
 160         return;
 161
 162     size_t enabledOffset(ivar_getOffset(_itemIsEnabled));
 163     size_t cloakedOffset(ivar_getOffset(_itemIsCloaked));
 164     if (enabledOffset >= cloakedOffset)
 165         return;
 166
 167     size_t offset(cloakedOffset - enabledOffset);
 168     char *timeString(_data + offset);
 169     strcpy(timeString, "Exit Safe Mode");
 170 } %end
 171
 172
 173 // this /insanely/ complex code came from that parrot guy... omg this is getting bad
 174
 175 @interface SBStatusBarStateAggregator : NSObject
 176 - (void) _stopTimeItemTimer;
 177 @end
 178
 179 %hook SBStatusBarStateAggregator
 180
 181 - (void) _updateTimeItems {
 182     if ([self respondsToSelector:@selector(_stopTimeItemTimer)])
 183         [self _stopTimeItemTimer];
 184     %orig;
 185 }
 186
 187 - (void) _restartTimeItemTimer {
 188 }
 189
 190 - (void) _resetTimeItemFormatter {
 191     %orig;
 192     if (NSDateFormatter *df = MSHookIvar<NSDateFormatter *>(self, "_timeItemDateFormatter"))
 193         [df setDateFormat:@"'Exit' 'Safe' 'Mode'"];
 194 }
 195
 196 %end
 197
 198
 199 static bool alerted_;
 200
 201 static void AlertIfNeeded() {
 202     if (alerted_)
 203         return;
 204     alerted_ = true;
 205     MSAlert();
 206 }
 207
 208 // on iOS 7 (maybe also iOS 6) we should really just hook the unlock mechanism
 209 // XXX: deterine where this works and maybe unify this code
 210
 211 %hook SBLockScreenManager
 212 - (void) _finishUIUnlockFromSource:(int)source withOptions:(id)options {
 213     %orig;
 214     AlertIfNeeded();
 215 } %end
 216
 217
 218 // on iOS 4.3 and above we can use this advertisement, which seems to check every time the user unlocks
 219 // XXX: verify that this still works on iOS 5.0
 220
 221 %hook AAAccountManager
 222 + (void) showMobileMeOfferIfNecessary {
 223     AlertIfNeeded();
 224 } %end
 225
 226
 227 // -[SBIconController showInfoAlertIfNeeded] explains how to drag icons around the iPhone home screen
 228 // it used to be shown to users when they unlocked their screen for the first time, and happened every unlock
 229 // however, as of iOS 4.3, it got relegated to only appearing once the user installed an app or web clip
 230
 231 %hook SBIconController
 232 - (void) showInfoAlertIfNeeded {
 233     AlertIfNeeded();
 234 } %end
 235
 236
 237 // the icon state, including crazy configurations like Five Icon Dock, is stored in SpringBoard's defaults
 238 // unfortunately, SpringBoard on iOS 2.0 and 2.1 (maybe 2.2 as well) buffer overrun with more than 4 icons
 239 // there is a third party package called IconSupport that remedies this, but not everyone is using it yet
 240
 241 %hook SBButtonBar
 242 - (int) maxIconColumns {
 243     static int max;
 244     if (max == 0) {
 245         max = %orig();
 246         if (NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults])
 247             if (NSDictionary *iconState = [defaults objectForKey:@"iconState"])
 248                 if (NSDictionary *buttonBar = [iconState objectForKey:@"buttonBar"])
 249                     if (NSArray *iconMatrix = [buttonBar objectForKey:@"iconMatrix"])
 250                         if ([iconMatrix count] != 0)
 251                             if (NSArray *row = [iconMatrix objectAtIndex:0]) {
 252                                 int count([row count]);
 253                                 if (max < count)
 254                                     max = count;
 255                             }
 256     } return max;
 257 } %end
 258
 259
 260 %hook SBUIController
 261 - (id) init {
 262     if ((self = %orig()) != nil) {
 263         UIView *&_contentLayer(MSHookIvar<UIView *>(self, "_contentLayer"));
 264         UIView *&_contentView(MSHookIvar<UIView *>(self, "_contentView"));
 265
 266         UIView *layer;
 267         if (&_contentLayer != NULL)
 268             layer = _contentLayer;
 269         else if (&_contentView != NULL)
 270             layer = _contentView;
 271         else
 272             layer = nil;
 273
 274         if (layer != nil)
 275             [layer setBackgroundColor:[UIColor darkGrayColor]];
 276     } return self;
 277 } %end
 278
 279 #define Paper_ "/Library/MobileSubstrate/MobileSafety.png"
 280
 281 %hook SBWallpaperImage
 282 + (id) alloc {
 283     return nil;
 284 } %end
 285
 286 %hook UIImage
 287 + (UIImage *) defaultDesktopImage {
 288     return [UIImage imageWithContentsOfFile:@Paper_];
 289 } %end
 290
 291 %hook SBStatusBarTimeView
 292 - (void) tile {
 293     NSString *&_time(MSHookIvar<NSString *>(self, "_time"));
 294     CGRect &_textRect(MSHookIvar<CGRect>(self, "_textRect"));
 295     if (_time != nil)
 296         [_time release];
 297     _time = [@"Exit Safe Mode" retain];
 298     id font([self textFont]);
 299     CGSize size([_time sizeWithFont:font]);
 300     CGRect frame([self frame]);
 301     _textRect.size = size;
 302     _textRect.origin.x = (frame.size.width - size.width) / 2;
 303     _textRect.origin.y = (frame.size.height - size.height) / 2;
 304 } %end
 305
 306
 307 // notification widgets ("wee apps" or "bulletin board sections") are capable of crashing SpringBoard
 308 // unfortunately, which ones are in use are stored in SpringBoard's defaults, so we need to turn them off
 309
 310 %hook BBSectionInfo
 311 - (BOOL) showsInNotificationCenter {
 312     return NO;
 313 } %end
 314
 315
 316 // we don't want this state persisted back to disk, however: that is just really really irritating
 317
 318 %hook BBServer
 319 - (void) _writeBehaviorOverrides {}
 320 - (void) _writeSectionOrder {}
 321 - (void) _writeClearedSections {}
 322 - (void) _writeSectionInfo {}
 323 %end
 324
 325
 326 // on iOS 6.0, Apple split parts of SpringBoard into a daemon called backboardd, including app launches
 327 // in order to allow safe mode to propogate into applications, we need to then tell backboardd here
 328 // XXX: (all of this should be replaced, however, with per-process launchd-mediated exception handling)
 329
 330 %hook BKSApplicationLaunchSettings
 331 - (void) setEnvironment:(NSDictionary *)original {
 332     if (original == nil)
 333         return %orig(nil);
 334
 335     NSMutableDictionary *modified([original mutableCopy]);
 336     [modified setObject:@"1" forKey:@"_MSSafeMode"];
 337     return %orig(modified);
 338 } %end
 339
 340 %ctor {
 341     NSAutoreleasePool *pool([[NSAutoreleasePool alloc] init]);
 342
 343     // on iOS 6, backboardd is in charge of brightness, and freaks out when SpringBoard restarts :(
 344     // the result is that the device is super dark until we attempt to update the brightness here.
 345
 346     if (kCFCoreFoundationVersionNumber >= 700) {
 347         if (void (*GSEventSetBacklightLevel)(float) = reinterpret_cast<void (*)(float)>(dlsym(RTLD_DEFAULT, "GSEventSetBacklightLevel")))
 348             if (NSMutableDictionary *defaults = [NSMutableDictionary dictionaryWithContentsOfFile:[NSString stringWithFormat:@"%@/Library/Preferences/com.apple.springboard.plist", NSHomeDirectory()]])
 349                 if (NSNumber *level = [defaults objectForKey:@"SBBacklightLevel2"])
 350                     GSEventSetBacklightLevel([level floatValue]);
 351     }
 352
 353     [pool release];
 354 }