MobileSafety.mm

   1 /* Cydia Substrate - Powerful Code Insertion Platform
   2  * Copyright (C) 2008-2012  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 %apt Package: com.saurik.substrate.safemode
  23 %apt Author: Jay Freeman (saurik) <saurik@saurik.com>
  24
  25 %apt Name: Substrate Safe Mode
  26 %apt Description: safe mode safety extension (safe)
  27
  28 %apt Depends: mobilesubstrate (>= 0.9.3367+38)
  29
  30 %fflag 1
  31 %fflag 2
  32
  33 %bundle com.apple.springboard
  34
  35 %flag -framework Foundation
  36 %flag -framework UIKit
  37
  38 #import <CoreFoundation/CoreFoundation.h>
  39 #import <Foundation/Foundation.h>
  40 #import <CoreGraphics/CGGeometry.h>
  41 #import <UIKit/UIKit.h>
  42
  43 #include "CydiaSubstrate.h"
  44
  45 MSClassHook(UIStatusBar)
  46
  47 MSClassHook(UIImage)
  48 MSMetaClassHook(UIImage)
  49
  50 MSClassHook(AAAccountManager)
  51 MSMetaClassHook(AAAccountManager)
  52
  53 MSClassHook(BBSectionInfo)
  54 MSClassHook(BKSApplicationLaunchSettings)
  55
  56 MSClassHook(SBAlertItemsController)
  57 MSClassHook(SBButtonBar)
  58 MSClassHook(SBIconController)
  59 MSClassHook(SBStatusBar)
  60 MSClassHook(SBStatusBarDataManager)
  61 MSClassHook(SBStatusBarTimeView)
  62 MSClassHook(SBUIController)
  63
  64 Class $SafeModeAlertItem;
  65
  66 @interface SBAlertItem : NSObject {
  67 }
  68 - (UIAlertView *) alertSheet;
  69 - (void) dismiss;
  70 @end
  71
  72 @interface SBAlertItemsController : NSObject {
  73 }
  74 + (SBAlertItemsController *) sharedInstance;
  75 - (void) activateAlertItem:(SBAlertItem *)item;
  76 @end
  77
  78 @interface SBStatusBarTimeView : UIView {
  79 }
  80 - (id) textFont;
  81 @end
  82
  83 @interface UIApplication (CydiaSubstrate)
  84 - (void) applicationOpenURL:(id)url;
  85 @end
  86
  87 @interface UIAlertView (CydiaSubstrate)
  88 - (void) setForceHorizontalButtonsLayout:(BOOL)force;
  89 - (void) setBodyText:(NSString *)body;
  90 - (void) setNumberOfRows:(NSInteger)rows;
  91 @end
  92
  93 void SafeModeAlertItem$alertSheet$buttonClicked$(id self, SEL sel, id sheet, int button) {
  94     switch (button) {
  95         case 1:
  96         break;
  97
  98         case 2:
  99             if (kCFCoreFoundationVersionNumber >= 700)
 100                 system("killall backboardd");
 101             else
 102                 // XXX: there are better ways of restarting SpringBoard that would actually save state
 103                 exit(0);
 104         break;
 105
 106         case 3:
 107             [[UIApplication sharedApplication] applicationOpenURL:[NSURL URLWithString:@"http://cydia.saurik.com/safemode/"]];
 108         break;
 109     }
 110
 111     [self dismiss];
 112 }
 113
 114 void SafeModeAlertItem$configure$requirePasscodeForActions$(id self, SEL sel, BOOL configure, BOOL require) {
 115     UIAlertView *sheet([self alertSheet]);
 116
 117     [sheet setDelegate:self];
 118     [sheet setBodyText:@"We apologize for the inconvenience, but SpringBoard has just crashed.\n\nMobileSubstrate /did not/ cause this problem: it has protected you from it.\n\nYour device is now running in Safe Mode. All extensions that support this safety system are disabled.\n\nReboot (or restart SpringBoard) to return to the normal mode. To return to this dialog touch the status bar.\n\nTap \"Help\" below for more tips."];
 119     [sheet addButtonWithTitle:@"OK"];
 120     [sheet addButtonWithTitle:@"Restart"];
 121     [sheet addButtonWithTitle:@"Help"];
 122     [sheet setNumberOfRows:1];
 123
 124     if ([sheet respondsToSelector:@selector(setForceHorizontalButtonsLayout:)])
 125         [sheet setForceHorizontalButtonsLayout:YES];
 126 }
 127
 128 void SafeModeAlertItem$performUnlockAction(id self, SEL sel) {
 129     [[$SBAlertItemsController sharedInstance] activateAlertItem:self];
 130 }
 131
 132 static void MSAlert() {
 133     if ($SafeModeAlertItem == nil)
 134         $SafeModeAlertItem = objc_lookUpClass("SafeModeAlertItem");
 135     if ($SafeModeAlertItem == nil) {
 136         $SafeModeAlertItem = objc_allocateClassPair(objc_getClass("SBAlertItem"), "SafeModeAlertItem", 0);
 137         if ($SafeModeAlertItem == nil)
 138             return;
 139
 140         class_addMethod($SafeModeAlertItem, @selector(alertSheet:buttonClicked:), (IMP) &SafeModeAlertItem$alertSheet$buttonClicked$, "v@:@i");
 141         class_addMethod($SafeModeAlertItem, @selector(configure:requirePasscodeForActions:), (IMP) &SafeModeAlertItem$configure$requirePasscodeForActions$, "v@:cc");
 142         class_addMethod($SafeModeAlertItem, @selector(performUnlockAction), (IMP) SafeModeAlertItem$performUnlockAction, "v@:");
 143         objc_registerClassPair($SafeModeAlertItem);
 144     }
 145
 146     if ($SBAlertItemsController != nil)
 147         [[$SBAlertItemsController sharedInstance] activateAlertItem:[[[$SafeModeAlertItem alloc] init] autorelease]];
 148 }
 149
 150
 151 // XXX: on iOS 5.0, we really would prefer avoiding
 152
 153 MSInstanceMessageHook2(void, SBStatusBar, touchesEnded,withEvent, id, touches, id, event) {
 154     MSAlert();
 155     MSOldCall(touches, event);
 156 }
 157
 158 MSInstanceMessageHook1(void, SBStatusBar, mouseDown, void *, event) {
 159     MSAlert();
 160     MSOldCall(event);
 161 }
 162
 163 MSInstanceMessageHook2(void, UIStatusBar, touchesBegan,withEvent, void *, touches, void *, event) {
 164     MSAlert();
 165     MSOldCall(touches, event);
 166 }
 167
 168
 169 // this fairly complex code came from Grant, to solve the "it Safe Mode"-in-bar bug
 170
 171 MSInstanceMessageHook0(void, SBStatusBarDataManager, _updateTimeString) {
 172     char *_data(&MSHookIvar<char>(self, "_data"));
 173     if (_data == NULL)
 174         return;
 175
 176     Ivar _itemIsEnabled(object_getInstanceVariable(self, "_itemIsEnabled", NULL));
 177     if (_itemIsEnabled == NULL)
 178         return;
 179
 180     Ivar _itemIsCloaked(object_getInstanceVariable(self, "_itemIsCloaked", NULL));
 181     if (_itemIsCloaked == NULL)
 182         return;
 183
 184     size_t enabledOffset(ivar_getOffset(_itemIsEnabled));
 185     size_t cloakedOffset(ivar_getOffset(_itemIsCloaked));
 186     if (enabledOffset >= cloakedOffset)
 187         return;
 188
 189     size_t offset(cloakedOffset - enabledOffset);
 190     char *timeString(_data + offset);
 191     strcpy(timeString, "Exit Safe Mode");
 192 }
 193
 194
 195 static bool alerted_;
 196
 197 static void AlertIfNeeded() {
 198     if (alerted_)
 199         return;
 200     alerted_ = true;
 201     MSAlert();
 202 }
 203
 204
 205 // on iOS 4.3 and above we can use this advertisement, which seems to check every time the user unlocks
 206 // XXX: verify that this still works on iOS 5.0
 207
 208 MSClassMessageHook0(void, AAAccountManager, showMobileMeOfferIfNecessary) {
 209     AlertIfNeeded();
 210 }
 211
 212
 213 // -[SBIconController showInfoAlertIfNeeded] explains how to drag icons around the iPhone home screen
 214 // it used to be shown to users when they unlocked their screen for the first time, and happened every unlock
 215 // however, as of iOS 4.3, it got relegated to only appearing once the user installed an app or web clip
 216
 217 MSInstanceMessageHook0(void, SBIconController, showInfoAlertIfNeeded) {
 218     AlertIfNeeded();
 219 }
 220
 221
 222 // the icon state, including crazy configurations like Five Icon Dock, is stored in SpringBoard's defaults
 223 // unfortunately, SpringBoard on iOS 2.0 and 2.1 (maybe 2.2 as well) buffer overrun with more than 4 icons
 224 // there is a third party package called IconSupport that remedies this, but not everyone is using it yet
 225
 226 MSInstanceMessageHook0(int, SBButtonBar, maxIconColumns) {
 227     static int max;
 228     if (max == 0) {
 229         max = MSOldCall();
 230         if (NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults])
 231             if (NSDictionary *iconState = [defaults objectForKey:@"iconState"])
 232                 if (NSDictionary *buttonBar = [iconState objectForKey:@"buttonBar"])
 233                     if (NSArray *iconMatrix = [buttonBar objectForKey:@"iconMatrix"])
 234                         if ([iconMatrix count] != 0)
 235                             if (NSArray *row = [iconMatrix objectAtIndex:0]) {
 236                                 int count([row count]);
 237                                 if (max < count)
 238                                     max = count;
 239                             }
 240     } return max;
 241 }
 242
 243
 244 MSInstanceMessageHook0(id, SBUIController, init) {
 245     if ((self = MSOldCall()) != nil) {
 246         UIView *&_contentLayer(MSHookIvar<UIView *>(self, "_contentLayer"));
 247         UIView *&_contentView(MSHookIvar<UIView *>(self, "_contentView"));
 248
 249         UIView *layer;
 250         if (&_contentLayer != NULL)
 251             layer = _contentLayer;
 252         else if (&_contentView != NULL)
 253             layer = _contentView;
 254         else
 255             layer = nil;
 256
 257         if (layer != nil)
 258             [layer setBackgroundColor:[UIColor darkGrayColor]];
 259     } return self;
 260 }
 261
 262 #define Paper_ "/Library/MobileSubstrate/MobileSafety.png"
 263
 264 MSClassMessageHook0(UIImage *, UIImage, defaultDesktopImage) {
 265     return [UIImage imageWithContentsOfFile:@Paper_];
 266 }
 267
 268 MSInstanceMessageHook0(void, SBStatusBarTimeView, tile) {
 269     NSString *&_time(MSHookIvar<NSString *>(self, "_time"));
 270     CGRect &_textRect(MSHookIvar<CGRect>(self, "_textRect"));
 271     if (_time != nil)
 272         [_time release];
 273     _time = [@"Exit Safe Mode" retain];
 274     id font([self textFont]);
 275     CGSize size([_time sizeWithFont:font]);
 276     CGRect frame([self frame]);
 277     _textRect.size = size;
 278     _textRect.origin.x = (frame.size.width - size.width) / 2;
 279     _textRect.origin.y = (frame.size.height - size.height) / 2;
 280 }
 281
 282
 283 // notification widgets ("wee apps" or "bulletin board sections") are capable of crashing SpringBoard
 284 // unfortunately, which ones are in use are stored in SpringBoard's defaults, so we need to turn them off
 285
 286 MSInstanceMessageHook0(BOOL, BBSectionInfo, showsInNotificationCenter) {
 287     return NO;
 288 }
 289
 290
 291 // on iOS 6.0, Apple split parts of SpringBoard into a daemon called backboardd, including app launches
 292 // in order to allow safe mode to propogate into applications, we need to then tell backboardd here
 293 // XXX: (all of this should be replaced, however, with per-process launchd-mediated exception handling)
 294
 295 MSInstanceMessageHook1(void, BKSApplicationLaunchSettings, setEnvironment, NSDictionary *, original) {
 296     if (original == nil)
 297         return MSOldCall(nil);
 298
 299     NSMutableDictionary *modified([original mutableCopy]);
 300     [modified setObject:@"1" forKey:@"_MSSafeMode"];
 301     return MSOldCall(modified);
 302 }
 303
 304 MSInitialize {
 305     NSAutoreleasePool *pool([[NSAutoreleasePool alloc] init]);
 306
 307     // on iOS 6, backboardd is in charge of brightness, and freaks out when SpringBoard restarts :(
 308     // the result is that the device is super dark until we attempt to update the brightness here.
 309
 310     if (kCFCoreFoundationVersionNumber >= 700) {
 311         if (void (*GSEventSetBacklightLevel)(float) = reinterpret_cast<void (*)(float)>(dlsym(RTLD_DEFAULT, "GSEventSetBacklightLevel")))
 312             if (NSMutableDictionary *defaults = [NSMutableDictionary dictionaryWithContentsOfFile:[NSString stringWithFormat:@"%@/Library/Preferences/com.apple.springboard.plist", NSHomeDirectory()]])
 313                 if (NSNumber *level = [defaults objectForKey:@"SBBacklightLevel2"])
 314                     GSEventSetBacklightLevel([level floatValue]);
 315     }
 316
 317     [pool release];
 318 }