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 $SafeModeAlertItem;
  30
  31 @interface SBAlertItem : NSObject {
  32 }
  33 - (UIAlertView *) alertSheet;
  34 - (void) dismiss;
  35 @end
  36
  37 @interface SBAlertItemsController : NSObject {
  38 }
  39 + (SBAlertItemsController *) sharedInstance;
  40 - (void) activateAlertItem:(SBAlertItem *)item;
  41 @end
  42
  43 @interface SBStatusBarTimeView : UIView {
  44 }
  45 - (id) textFont;
  46 @end
  47
  48 @interface UIApplication (CydiaSubstrate)
  49 - (void) applicationOpenURL:(id)url;
  50 @end
  51
  52 @interface UIAlertView (CydiaSubstrate)
  53 - (void) setForceHorizontalButtonsLayout:(BOOL)force;
  54 - (void) setBodyText:(NSString *)body;
  55 - (void) setNumberOfRows:(NSInteger)rows;
  56 @end
  57
  58 void SafeModeAlertItem$alertSheet$buttonClicked$(id self, SEL sel, id sheet, 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     [self dismiss];
  77 }
  78
  79 void SafeModeAlertItem$configure$requirePasscodeForActions$(id self, SEL sel, BOOL configure, BOOL require) {
  80     UIAlertView *sheet([self alertSheet]);
  81
  82     [sheet setDelegate:self];
  83     [sheet setBodyText:@"We apologize for the inconvenience, but SpringBoard has just crashed.\n\nMobileSubstrate /did not/ cause this problem: it has protected you from it.\n\nYour device is now running in Safe Mode. All extensions that support this safety system are disabled.\n\nReboot (or restart SpringBoard) to return to the normal mode. To return to this dialog touch the status bar.\n\nTap \"Help\" below for more tips."];
  84     [sheet addButtonWithTitle:@"OK"];
  85     [sheet addButtonWithTitle:@"Restart"];
  86     [sheet addButtonWithTitle:@"Help"];
  87     [sheet setNumberOfRows:1];
  88
  89     if ([sheet respondsToSelector:@selector(setForceHorizontalButtonsLayout:)])
  90         [sheet setForceHorizontalButtonsLayout:YES];
  91 }
  92
  93 void SafeModeAlertItem$performUnlockAction(id self, SEL sel) {
  94     [[%c(SBAlertItemsController) sharedInstance] activateAlertItem:self];
  95 }
  96
  97 static void MSAlert() {
  98     if ($SafeModeAlertItem == nil)
  99         $SafeModeAlertItem = objc_lookUpClass("SafeModeAlertItem");
 100     if ($SafeModeAlertItem == nil) {
 101         $SafeModeAlertItem = objc_allocateClassPair(objc_getClass("SBAlertItem"), "SafeModeAlertItem", 0);
 102         if ($SafeModeAlertItem == nil)
 103             return;
 104
 105         class_addMethod($SafeModeAlertItem, @selector(alertSheet:buttonClicked:), (IMP) &SafeModeAlertItem$alertSheet$buttonClicked$, "v@:@i");
 106         class_addMethod($SafeModeAlertItem, @selector(configure:requirePasscodeForActions:), (IMP) &SafeModeAlertItem$configure$requirePasscodeForActions$, "v@:cc");
 107         class_addMethod($SafeModeAlertItem, @selector(performUnlockAction), (IMP) SafeModeAlertItem$performUnlockAction, "v@:");
 108         objc_registerClassPair($SafeModeAlertItem);
 109     }
 110
 111     if (%c(SBAlertItemsController) != nil)
 112         [[%c(SBAlertItemsController) sharedInstance] activateAlertItem:[[[$SafeModeAlertItem alloc] init] autorelease]];
 113 }
 114
 115
 116 // XXX: on iOS 5.0, we really would prefer avoiding
 117
 118 %hook SBStatusBar
 119 - (void) touchesEnded:(id)touches withEvent:(id)event {
 120     MSAlert();
 121     %orig(touches, event);
 122 } %end
 123
 124 %hook SBStatusBar
 125 - (void) mouseDown:(void *)event {
 126     MSAlert();
 127     %orig(event);
 128 } %end
 129
 130 %hook UIStatusBar
 131 - (void) touchesBegan:(void *)touches withEvent:(void *)event {
 132     MSAlert();
 133     %orig(touches, event);
 134 } %end
 135
 136
 137 // this fairly complex code came from Grant, to solve the "it Safe Mode"-in-bar bug
 138
 139 %hook SBStatusBarDataManager
 140 - (void) _updateTimeString {
 141     char *_data(&MSHookIvar<char>(self, "_data"));
 142     if (_data == NULL)
 143         return;
 144
 145     Ivar _itemIsEnabled(object_getInstanceVariable(self, "_itemIsEnabled", NULL));
 146     if (_itemIsEnabled == NULL)
 147         return;
 148
 149     Ivar _itemIsCloaked(object_getInstanceVariable(self, "_itemIsCloaked", NULL));
 150     if (_itemIsCloaked == NULL)
 151         return;
 152
 153     size_t enabledOffset(ivar_getOffset(_itemIsEnabled));
 154     size_t cloakedOffset(ivar_getOffset(_itemIsCloaked));
 155     if (enabledOffset >= cloakedOffset)
 156         return;
 157
 158     size_t offset(cloakedOffset - enabledOffset);
 159     char *timeString(_data + offset);
 160     strcpy(timeString, "Exit Safe Mode");
 161 } %end
 162
 163
 164 static bool alerted_;
 165
 166 static void AlertIfNeeded() {
 167     if (alerted_)
 168         return;
 169     alerted_ = true;
 170     MSAlert();
 171 }
 172
 173
 174 // on iOS 4.3 and above we can use this advertisement, which seems to check every time the user unlocks
 175 // XXX: verify that this still works on iOS 5.0
 176
 177 %hook AAAccountManager
 178 + (void) showMobileMeOfferIfNecessary {
 179     AlertIfNeeded();
 180 } %end
 181
 182
 183 // -[SBIconController showInfoAlertIfNeeded] explains how to drag icons around the iPhone home screen
 184 // it used to be shown to users when they unlocked their screen for the first time, and happened every unlock
 185 // however, as of iOS 4.3, it got relegated to only appearing once the user installed an app or web clip
 186
 187 %hook SBIconController
 188 - (void) showInfoAlertIfNeeded {
 189     AlertIfNeeded();
 190 } %end
 191
 192
 193 // the icon state, including crazy configurations like Five Icon Dock, is stored in SpringBoard's defaults
 194 // unfortunately, SpringBoard on iOS 2.0 and 2.1 (maybe 2.2 as well) buffer overrun with more than 4 icons
 195 // there is a third party package called IconSupport that remedies this, but not everyone is using it yet
 196
 197 %hook SBButtonBar
 198 - (int) maxIconColumns {
 199     static int max;
 200     if (max == 0) {
 201         max = %orig();
 202         if (NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults])
 203             if (NSDictionary *iconState = [defaults objectForKey:@"iconState"])
 204                 if (NSDictionary *buttonBar = [iconState objectForKey:@"buttonBar"])
 205                     if (NSArray *iconMatrix = [buttonBar objectForKey:@"iconMatrix"])
 206                         if ([iconMatrix count] != 0)
 207                             if (NSArray *row = [iconMatrix objectAtIndex:0]) {
 208                                 int count([row count]);
 209                                 if (max < count)
 210                                     max = count;
 211                             }
 212     } return max;
 213 } %end
 214
 215
 216 %hook SBUIController
 217 - (id) init {
 218     if ((self = %orig()) != nil) {
 219         UIView *&_contentLayer(MSHookIvar<UIView *>(self, "_contentLayer"));
 220         UIView *&_contentView(MSHookIvar<UIView *>(self, "_contentView"));
 221
 222         UIView *layer;
 223         if (&_contentLayer != NULL)
 224             layer = _contentLayer;
 225         else if (&_contentView != NULL)
 226             layer = _contentView;
 227         else
 228             layer = nil;
 229
 230         if (layer != nil)
 231             [layer setBackgroundColor:[UIColor darkGrayColor]];
 232     } return self;
 233 } %end
 234
 235 #define Paper_ "/Library/MobileSubstrate/MobileSafety.png"
 236
 237 %hook UIImage
 238 + (UIImage *) defaultDesktopImage {
 239     return [UIImage imageWithContentsOfFile:@Paper_];
 240 } %end
 241
 242 %hook SBStatusBarTimeView
 243 - (void) tile {
 244     NSString *&_time(MSHookIvar<NSString *>(self, "_time"));
 245     CGRect &_textRect(MSHookIvar<CGRect>(self, "_textRect"));
 246     if (_time != nil)
 247         [_time release];
 248     _time = [@"Exit Safe Mode" retain];
 249     id font([self textFont]);
 250     CGSize size([_time sizeWithFont:font]);
 251     CGRect frame([self frame]);
 252     _textRect.size = size;
 253     _textRect.origin.x = (frame.size.width - size.width) / 2;
 254     _textRect.origin.y = (frame.size.height - size.height) / 2;
 255 } %end
 256
 257
 258 // notification widgets ("wee apps" or "bulletin board sections") are capable of crashing SpringBoard
 259 // unfortunately, which ones are in use are stored in SpringBoard's defaults, so we need to turn them off
 260
 261 %hook BBSectionInfo
 262 - (BOOL) showsInNotificationCenter {
 263     return NO;
 264 } %end
 265
 266
 267 // on iOS 6.0, Apple split parts of SpringBoard into a daemon called backboardd, including app launches
 268 // in order to allow safe mode to propogate into applications, we need to then tell backboardd here
 269 // XXX: (all of this should be replaced, however, with per-process launchd-mediated exception handling)
 270
 271 %hook BKSApplicationLaunchSettings
 272 - (void) setEnvironment:(NSDictionary *)original {
 273     if (original == nil)
 274         return %orig(nil);
 275
 276     NSMutableDictionary *modified([original mutableCopy]);
 277     [modified setObject:@"1" forKey:@"_MSSafeMode"];
 278     return %orig(modified);
 279 } %end
 280
 281 %ctor {
 282     NSAutoreleasePool *pool([[NSAutoreleasePool alloc] init]);
 283
 284     // on iOS 6, backboardd is in charge of brightness, and freaks out when SpringBoard restarts :(
 285     // the result is that the device is super dark until we attempt to update the brightness here.
 286
 287     if (kCFCoreFoundationVersionNumber >= 700) {
 288         if (void (*GSEventSetBacklightLevel)(float) = reinterpret_cast<void (*)(float)>(dlsym(RTLD_DEFAULT, "GSEventSetBacklightLevel")))
 289             if (NSMutableDictionary *defaults = [NSMutableDictionary dictionaryWithContentsOfFile:[NSString stringWithFormat:@"%@/Library/Preferences/com.apple.springboard.plist", NSHomeDirectory()]])
 290                 if (NSNumber *level = [defaults objectForKey:@"SBBacklightLevel2"])
 291                     GSEventSetBacklightLevel([level floatValue]);
 292     }
 293
 294     [pool release];
 295 }