ldid.cpp

   1 /* ldid - (Mach-O) Link-Loader Identity Editor
   2  * Copyright (C) 2007-2012  Jay Freeman (saurik)
   3 */
   4
   5 /* GNU Affero General Public License, Version 3 {{{ */
   6 /*
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 **/
  20 /* }}} */
  21
  22 #include "minimal/stdlib.h"
  23 #include "minimal/string.h"
  24 #include "minimal/mapping.h"
  25
  26 extern "C" {
  27 #include "sha1.h"
  28 }
  29
  30 #include <cstring>
  31 #include <string>
  32 #include <vector>
  33
  34 #include <plist/plist.h>
  35
  36 struct fat_header {
  37     uint32_t magic;
  38     uint32_t nfat_arch;
  39 } _packed;
  40
  41 #define FAT_MAGIC 0xcafebabe
  42 #define FAT_CIGAM 0xbebafeca
  43
  44 struct fat_arch {
  45     uint32_t cputype;
  46     uint32_t cpusubtype;
  47     uint32_t offset;
  48     uint32_t size;
  49     uint32_t align;
  50 } _packed;
  51
  52 struct mach_header {
  53     uint32_t magic;
  54     uint32_t cputype;
  55     uint32_t cpusubtype;
  56     uint32_t filetype;
  57     uint32_t ncmds;
  58     uint32_t sizeofcmds;
  59     uint32_t flags;
  60 } _packed;
  61
  62 #define MH_MAGIC 0xfeedface
  63 #define MH_CIGAM 0xcefaedfe
  64
  65 #define MH_MAGIC_64 0xfeedfacf
  66 #define MH_CIGAM_64 0xcffaedfe
  67
  68 #define MH_DYLDLINK   0x4
  69
  70 #define MH_OBJECT     0x1
  71 #define MH_EXECUTE    0x2
  72 #define MH_DYLIB      0x6
  73 #define MH_BUNDLE     0x8
  74 #define MH_DYLIB_STUB 0x9
  75
  76 struct load_command {
  77     uint32_t cmd;
  78     uint32_t cmdsize;
  79 } _packed;
  80
  81 #define LC_REQ_DYLD           uint32_t(0x80000000)
  82
  83 #define LC_SEGMENT            uint32_t(0x01)
  84 #define LC_SYMTAB             uint32_t(0x02)
  85 #define LC_DYSYMTAB           uint32_t(0x0b)
  86 #define LC_LOAD_DYLIB         uint32_t(0x0c)
  87 #define LC_ID_DYLIB           uint32_t(0x0d)
  88 #define LC_SEGMENT_64         uint32_t(0x19)
  89 #define LC_UUID               uint32_t(0x1b)
  90 #define LC_CODE_SIGNATURE     uint32_t(0x1d)
  91 #define LC_SEGMENT_SPLIT_INFO uint32_t(0x1e)
  92 #define LC_REEXPORT_DYLIB     uint32_t(0x1f | LC_REQ_DYLD)
  93 #define LC_ENCRYPTION_INFO    uint32_t(0x21)
  94 #define LC_DYLD_INFO          uint32_t(0x22)
  95 #define LC_DYLD_INFO_ONLY     uint32_t(0x22 | LC_REQ_DYLD)
  96
  97 struct dylib {
  98     uint32_t name;
  99     uint32_t timestamp;
 100     uint32_t current_version;
 101     uint32_t compatibility_version;
 102 } _packed;
 103
 104 struct dylib_command {
 105     uint32_t cmd;
 106     uint32_t cmdsize;
 107     struct dylib dylib;
 108 } _packed;
 109
 110 struct uuid_command {
 111     uint32_t cmd;
 112     uint32_t cmdsize;
 113     uint8_t uuid[16];
 114 } _packed;
 115
 116 struct symtab_command {
 117     uint32_t cmd;
 118     uint32_t cmdsize;
 119     uint32_t symoff;
 120     uint32_t nsyms;
 121     uint32_t stroff;
 122     uint32_t strsize;
 123 } _packed;
 124
 125 struct dyld_info_command {
 126     uint32_t cmd;
 127     uint32_t cmdsize;
 128     uint32_t rebase_off;
 129     uint32_t rebase_size;
 130     uint32_t bind_off;
 131     uint32_t bind_size;
 132     uint32_t weak_bind_off;
 133     uint32_t weak_bind_size;
 134     uint32_t lazy_bind_off;
 135     uint32_t lazy_bind_size;
 136     uint32_t export_off;
 137     uint32_t export_size;
 138 } _packed;
 139
 140 struct dysymtab_command {
 141     uint32_t cmd;
 142     uint32_t cmdsize;
 143     uint32_t ilocalsym;
 144     uint32_t nlocalsym;
 145     uint32_t iextdefsym;
 146     uint32_t nextdefsym;
 147     uint32_t iundefsym;
 148     uint32_t nundefsym;
 149     uint32_t tocoff;
 150     uint32_t ntoc;
 151     uint32_t modtaboff;
 152     uint32_t nmodtab;
 153     uint32_t extrefsymoff;
 154     uint32_t nextrefsyms;
 155     uint32_t indirectsymoff;
 156     uint32_t nindirectsyms;
 157     uint32_t extreloff;
 158     uint32_t nextrel;
 159     uint32_t locreloff;
 160     uint32_t nlocrel;
 161 } _packed;
 162
 163 struct dylib_table_of_contents {
 164     uint32_t symbol_index;
 165     uint32_t module_index;
 166 } _packed;
 167
 168 struct dylib_module {
 169     uint32_t module_name;
 170     uint32_t iextdefsym;
 171     uint32_t nextdefsym;
 172     uint32_t irefsym;
 173     uint32_t nrefsym;
 174     uint32_t ilocalsym;
 175     uint32_t nlocalsym;
 176     uint32_t iextrel;
 177     uint32_t nextrel;
 178     uint32_t iinit_iterm;
 179     uint32_t ninit_nterm;
 180     uint32_t objc_module_info_addr;
 181     uint32_t objc_module_info_size;
 182 } _packed;
 183
 184 struct dylib_reference {
 185     uint32_t isym:24;
 186     uint32_t flags:8;
 187 } _packed;
 188
 189 struct relocation_info {
 190     int32_t r_address;
 191     uint32_t r_symbolnum:24;
 192     uint32_t r_pcrel:1;
 193     uint32_t r_length:2;
 194     uint32_t r_extern:1;
 195     uint32_t r_type:4;
 196 } _packed;
 197
 198 struct nlist {
 199     union {
 200         char *n_name;
 201         int32_t n_strx;
 202     } n_un;
 203
 204     uint8_t n_type;
 205     uint8_t n_sect;
 206     uint8_t n_desc;
 207     uint32_t n_value;
 208 } _packed;
 209
 210 struct segment_command {
 211     uint32_t cmd;
 212     uint32_t cmdsize;
 213     char segname[16];
 214     uint32_t vmaddr;
 215     uint32_t vmsize;
 216     uint32_t fileoff;
 217     uint32_t filesize;
 218     uint32_t maxprot;
 219     uint32_t initprot;
 220     uint32_t nsects;
 221     uint32_t flags;
 222 } _packed;
 223
 224 struct segment_command_64 {
 225     uint32_t cmd;
 226     uint32_t cmdsize;
 227     char segname[16];
 228     uint64_t vmaddr;
 229     uint64_t vmsize;
 230     uint64_t fileoff;
 231     uint64_t filesize;
 232     uint32_t maxprot;
 233     uint32_t initprot;
 234     uint32_t nsects;
 235     uint32_t flags;
 236 } _packed;
 237
 238 struct section {
 239     char sectname[16];
 240     char segname[16];
 241     uint32_t addr;
 242     uint32_t size;
 243     uint32_t offset;
 244     uint32_t align;
 245     uint32_t reloff;
 246     uint32_t nreloc;
 247     uint32_t flags;
 248     uint32_t reserved1;
 249     uint32_t reserved2;
 250 } _packed;
 251
 252 struct section_64 {
 253     char sectname[16];
 254     char segname[16];
 255     uint64_t addr;
 256     uint64_t size;
 257     uint32_t offset;
 258     uint32_t align;
 259     uint32_t reloff;
 260     uint32_t nreloc;
 261     uint32_t flags;
 262     uint32_t reserved1;
 263     uint32_t reserved2;
 264 } _packed;
 265
 266 struct linkedit_data_command {
 267     uint32_t cmd;
 268     uint32_t cmdsize;
 269     uint32_t dataoff;
 270     uint32_t datasize;
 271 } _packed;
 272
 273 struct encryption_info_command {
 274     uint32_t cmd;
 275     uint32_t cmdsize;
 276     uint32_t cryptoff;
 277     uint32_t cryptsize;
 278     uint32_t cryptid;
 279 } _packed;
 280
 281 #define BIND_OPCODE_MASK                             0xf0
 282 #define BIND_IMMEDIATE_MASK                          0x0f
 283 #define BIND_OPCODE_DONE                             0x00
 284 #define BIND_OPCODE_SET_DYLIB_ORDINAL_IMM            0x10
 285 #define BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB           0x20
 286 #define BIND_OPCODE_SET_DYLIB_SPECIAL_IMM            0x30
 287 #define BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM    0x40
 288 #define BIND_OPCODE_SET_TYPE_IMM                     0x50
 289 #define BIND_OPCODE_SET_ADDEND_SLEB                  0x60
 290 #define BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB      0x70
 291 #define BIND_OPCODE_ADD_ADDR_ULEB                    0x80
 292 #define BIND_OPCODE_DO_BIND                          0x90
 293 #define BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB            0xa0
 294 #define BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED      0xb0
 295 #define BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB 0xc0
 296
 297 template <typename Type_>
 298 Type_ Align(Type_ value, size_t align) {
 299     value += align - 1;
 300     value /= align;
 301     value *= align;
 302     return value;
 303 }
 304
 305 uint16_t Swap_(uint16_t value) {
 306     return
 307         ((value >>  8) & 0x00ff) |
 308         ((value <<  8) & 0xff00);
 309 }
 310
 311 uint32_t Swap_(uint32_t value) {
 312     value = ((value >>  8) & 0x00ff00ff) |
 313             ((value <<  8) & 0xff00ff00);
 314     value = ((value >> 16) & 0x0000ffff) |
 315             ((value << 16) & 0xffff0000);
 316     return value;
 317 }
 318
 319 uint64_t Swap_(uint64_t value) {
 320     value = (value & 0x00000000ffffffff) << 32 | (value & 0xffffffff00000000) >> 32;
 321     value = (value & 0x0000ffff0000ffff) << 16 | (value & 0xffff0000ffff0000) >> 16;
 322     value = (value & 0x00ff00ff00ff00ff) << 8  | (value & 0xff00ff00ff00ff00) >> 8;
 323     return value;
 324 }
 325
 326 int16_t Swap_(int16_t value) {
 327     return Swap_(static_cast<uint16_t>(value));
 328 }
 329
 330 int32_t Swap_(int32_t value) {
 331     return Swap_(static_cast<uint32_t>(value));
 332 }
 333
 334 int64_t Swap_(int64_t value) {
 335     return Swap_(static_cast<uint64_t>(value));
 336 }
 337
 338 bool little_(true);
 339
 340 uint16_t Swap(uint16_t value) {
 341     return little_ ? Swap_(value) : value;
 342 }
 343
 344 uint32_t Swap(uint32_t value) {
 345     return little_ ? Swap_(value) : value;
 346 }
 347
 348 uint64_t Swap(uint64_t value) {
 349     return little_ ? Swap_(value) : value;
 350 }
 351
 352 int16_t Swap(int16_t value) {
 353     return Swap(static_cast<uint16_t>(value));
 354 }
 355
 356 int32_t Swap(int32_t value) {
 357     return Swap(static_cast<uint32_t>(value));
 358 }
 359
 360 int64_t Swap(int64_t value) {
 361     return Swap(static_cast<uint64_t>(value));
 362 }
 363
 364 template <typename Target_>
 365 class Pointer;
 366
 367 class Data {
 368   private:
 369     void *base_;
 370     size_t size_;
 371
 372   protected:
 373     bool swapped_;
 374
 375   public:
 376     Data(void *base, size_t size) :
 377         base_(base),
 378         size_(size),
 379         swapped_(false)
 380     {
 381     }
 382
 383     uint16_t Swap(uint16_t value) const {
 384         return swapped_ ? Swap_(value) : value;
 385     }
 386
 387     uint32_t Swap(uint32_t value) const {
 388         return swapped_ ? Swap_(value) : value;
 389     }
 390
 391     uint64_t Swap(uint64_t value) const {
 392         return swapped_ ? Swap_(value) : value;
 393     }
 394
 395     int16_t Swap(int16_t value) const {
 396         return Swap(static_cast<uint16_t>(value));
 397     }
 398
 399     int32_t Swap(int32_t value) const {
 400         return Swap(static_cast<uint32_t>(value));
 401     }
 402
 403     int64_t Swap(int64_t value) const {
 404         return Swap(static_cast<uint64_t>(value));
 405     }
 406
 407     void *GetBase() const {
 408         return base_;
 409     }
 410
 411     size_t GetSize() const {
 412         return size_;
 413     }
 414 };
 415
 416 class MachHeader :
 417     public Data
 418 {
 419   private:
 420     bool bits64_;
 421
 422     struct mach_header *mach_header_;
 423     struct load_command *load_command_;
 424
 425   public:
 426     MachHeader(void *base, size_t size) :
 427         Data(base, size)
 428     {
 429         mach_header_ = (mach_header *) base;
 430
 431         switch (Swap(mach_header_->magic)) {
 432             case MH_CIGAM:
 433                 swapped_ = !swapped_;
 434             case MH_MAGIC:
 435                 bits64_ = false;
 436             break;
 437
 438             case MH_CIGAM_64:
 439                 swapped_ = !swapped_;
 440             case MH_MAGIC_64:
 441                 bits64_ = true;
 442             break;
 443
 444             default:
 445                 _assert(false);
 446         }
 447
 448         void *post = mach_header_ + 1;
 449         if (bits64_)
 450             post = (uint32_t *) post + 1;
 451         load_command_ = (struct load_command *) post;
 452
 453         _assert(
 454             Swap(mach_header_->filetype) == MH_EXECUTE ||
 455             Swap(mach_header_->filetype) == MH_DYLIB ||
 456             Swap(mach_header_->filetype) == MH_BUNDLE
 457         );
 458     }
 459
 460     struct mach_header *operator ->() const {
 461         return mach_header_;
 462     }
 463
 464     operator struct mach_header *() const {
 465         return mach_header_;
 466     }
 467
 468     uint32_t GetCPUType() const {
 469         return Swap(mach_header_->cputype);
 470     }
 471
 472     uint32_t GetCPUSubtype() const {
 473         return Swap(mach_header_->cpusubtype) & 0xff;
 474     }
 475
 476     struct load_command *GetLoadCommand() const {
 477         return load_command_;
 478     }
 479
 480     std::vector<struct load_command *> GetLoadCommands() const {
 481         std::vector<struct load_command *> load_commands;
 482
 483         struct load_command *load_command = load_command_;
 484         for (uint32_t cmd = 0; cmd != Swap(mach_header_->ncmds); ++cmd) {
 485             load_commands.push_back(load_command);
 486             load_command = (struct load_command *) ((uint8_t *) load_command + Swap(load_command->cmdsize));
 487         }
 488
 489         return load_commands;
 490     }
 491
 492     std::vector<segment_command *> GetSegments(const char *segment_name) const {
 493         std::vector<struct segment_command *> segment_commands;
 494
 495         _foreach (load_command, GetLoadCommands()) {
 496             if (Swap(load_command->cmd) == LC_SEGMENT) {
 497                 segment_command *segment_command = reinterpret_cast<struct segment_command *>(load_command);
 498                 if (strncmp(segment_command->segname, segment_name, 16) == 0)
 499                     segment_commands.push_back(segment_command);
 500             }
 501         }
 502
 503         return segment_commands;
 504     }
 505
 506     std::vector<segment_command_64 *> GetSegments64(const char *segment_name) const {
 507         std::vector<struct segment_command_64 *> segment_commands;
 508
 509         _foreach (load_command, GetLoadCommands()) {
 510             if (Swap(load_command->cmd) == LC_SEGMENT_64) {
 511                 segment_command_64 *segment_command = reinterpret_cast<struct segment_command_64 *>(load_command);
 512                 if (strncmp(segment_command->segname, segment_name, 16) == 0)
 513                     segment_commands.push_back(segment_command);
 514             }
 515         }
 516
 517         return segment_commands;
 518     }
 519
 520     std::vector<section *> GetSections(const char *segment_name, const char *section_name) const {
 521         std::vector<section *> sections;
 522
 523         _foreach (segment, GetSegments(segment_name)) {
 524             section *section = (struct section *) (segment + 1);
 525
 526             uint32_t sect;
 527             for (sect = 0; sect != Swap(segment->nsects); ++sect) {
 528                 if (strncmp(section->sectname, section_name, 16) == 0)
 529                     sections.push_back(section);
 530                 ++section;
 531             }
 532         }
 533
 534         return sections;
 535     }
 536
 537     template <typename Target_>
 538     Pointer<Target_> GetPointer(uint32_t address, const char *segment_name = NULL) const {
 539         load_command *load_command = (struct load_command *) (mach_header_ + 1);
 540         uint32_t cmd;
 541
 542         for (cmd = 0; cmd != Swap(mach_header_->ncmds); ++cmd) {
 543             if (Swap(load_command->cmd) == LC_SEGMENT) {
 544                 segment_command *segment_command = (struct segment_command *) load_command;
 545                 if (segment_name != NULL && strncmp(segment_command->segname, segment_name, 16) != 0)
 546                     goto next_command;
 547
 548                 section *sections = (struct section *) (segment_command + 1);
 549
 550                 uint32_t sect;
 551                 for (sect = 0; sect != Swap(segment_command->nsects); ++sect) {
 552                     section *section = &sections[sect];
 553                     //printf("%s %u %p %p %u\n", segment_command->segname, sect, address, section->addr, section->size);
 554                     if (address >= Swap(section->addr) && address < Swap(section->addr) + Swap(section->size)) {
 555                         //printf("0x%.8x %s\n", address, segment_command->segname);
 556                         return Pointer<Target_>(this, reinterpret_cast<Target_ *>(address - Swap(section->addr) + Swap(section->offset) + (char *) mach_header_));
 557                     }
 558                 }
 559             }
 560
 561           next_command:
 562             load_command = (struct load_command *) ((char *) load_command + Swap(load_command->cmdsize));
 563         }
 564
 565         return Pointer<Target_>(this);
 566     }
 567
 568     template <typename Target_>
 569     Pointer<Target_> GetOffset(uint32_t offset) {
 570         return Pointer<Target_>(this, reinterpret_cast<Target_ *>(offset + (uint8_t *) mach_header_));
 571     }
 572 };
 573
 574 class FatMachHeader :
 575     public MachHeader
 576 {
 577   private:
 578     fat_arch *fat_arch_;
 579
 580   public:
 581     FatMachHeader(void *base, size_t size, fat_arch *fat_arch) :
 582         MachHeader(base, size),
 583         fat_arch_(fat_arch)
 584     {
 585     }
 586
 587     fat_arch *GetFatArch() const {
 588         return fat_arch_;
 589     }
 590 };
 591
 592 class FatHeader :
 593     public Data
 594 {
 595   private:
 596     fat_header *fat_header_;
 597     std::vector<FatMachHeader> mach_headers_;
 598
 599   public:
 600     FatHeader(void *base, size_t size) :
 601         Data(base, size)
 602     {
 603         fat_header_ = reinterpret_cast<struct fat_header *>(base);
 604
 605         if (Swap(fat_header_->magic) == FAT_CIGAM) {
 606             swapped_ = !swapped_;
 607             goto fat;
 608         } else if (Swap(fat_header_->magic) != FAT_MAGIC) {
 609             fat_header_ = NULL;
 610             mach_headers_.push_back(FatMachHeader(base, size, NULL));
 611         } else fat: {
 612             size_t fat_narch = Swap(fat_header_->nfat_arch);
 613             fat_arch *fat_arch = reinterpret_cast<struct fat_arch *>(fat_header_ + 1);
 614             size_t arch;
 615             for (arch = 0; arch != fat_narch; ++arch) {
 616                 uint32_t arch_offset = Swap(fat_arch->offset);
 617                 uint32_t arch_size = Swap(fat_arch->size);
 618                 mach_headers_.push_back(FatMachHeader((uint8_t *) base + arch_offset, arch_size, fat_arch));
 619                 ++fat_arch;
 620             }
 621         }
 622     }
 623
 624     std::vector<FatMachHeader> &GetMachHeaders() {
 625         return mach_headers_;
 626     }
 627
 628     bool IsFat() const {
 629         return fat_header_ != NULL;
 630     }
 631
 632     struct fat_header *operator ->() const {
 633         return fat_header_;
 634     }
 635
 636     operator struct fat_header *() const {
 637         return fat_header_;
 638     }
 639 };
 640
 641 FatHeader Map(const char *path, bool ro = false) {
 642     size_t size;
 643     void *base(map(path, 0, _not(size_t), &size, ro));
 644     return FatHeader(base, size);
 645 }
 646
 647 template <typename Target_>
 648 class Pointer {
 649   private:
 650     const MachHeader *framework_;
 651     const Target_ *pointer_;
 652
 653   public:
 654     Pointer(const MachHeader *framework = NULL, const Target_ *pointer = NULL) :
 655         framework_(framework),
 656         pointer_(pointer)
 657     {
 658     }
 659
 660     operator const Target_ *() const {
 661         return pointer_;
 662     }
 663
 664     const Target_ *operator ->() const {
 665         return pointer_;
 666     }
 667
 668     Pointer<Target_> &operator ++() {
 669         ++pointer_;
 670         return *this;
 671     }
 672
 673     template <typename Value_>
 674     Value_ Swap(Value_ value) {
 675         return framework_->Swap(value);
 676     }
 677 };
 678
 679 #define CSMAGIC_CODEDIRECTORY      uint32_t(0xfade0c02)
 680 #define CSMAGIC_EMBEDDED_SIGNATURE uint32_t(0xfade0cc0)
 681 #define CSMAGIC_ENTITLEMENTS       uint32_t(0xfade7171)
 682
 683 #define CSSLOT_CODEDIRECTORY uint32_t(0)
 684 #define CSSLOT_REQUIREMENTS  uint32_t(2)
 685 #define CSSLOT_ENTITLEMENTS  uint32_t(5)
 686
 687 struct BlobIndex {
 688     uint32_t type;
 689     uint32_t offset;
 690 } _packed;
 691
 692 struct Blob {
 693     uint32_t magic;
 694     uint32_t length;
 695 } _packed;
 696
 697 struct SuperBlob {
 698     struct Blob blob;
 699     uint32_t count;
 700     struct BlobIndex index[];
 701 } _packed;
 702
 703 struct CodeDirectory {
 704     struct Blob blob;
 705     uint32_t version;
 706     uint32_t flags;
 707     uint32_t hashOffset;
 708     uint32_t identOffset;
 709     uint32_t nSpecialSlots;
 710     uint32_t nCodeSlots;
 711     uint32_t codeLimit;
 712     uint8_t hashSize;
 713     uint8_t hashType;
 714     uint8_t spare1;
 715     uint8_t pageSize;
 716     uint32_t spare2;
 717 } _packed;
 718
 719 extern "C" uint32_t hash(uint8_t *k, uint32_t length, uint32_t initval);
 720
 721 void sha1(uint8_t *hash, uint8_t *data, size_t size) {
 722     SHA1Context context;
 723     SHA1Reset(&context);
 724     SHA1Input(&context, data, size);
 725     SHA1Result(&context, hash);
 726 }
 727
 728 struct CodesignAllocation {
 729     FatMachHeader mach_header_;
 730     uint32_t offset_;
 731     uint32_t size_;
 732     uint32_t alloc_;
 733     uint32_t align_;
 734
 735     CodesignAllocation(FatMachHeader mach_header, size_t offset, size_t size, size_t alloc, size_t align) :
 736         mach_header_(mach_header),
 737         offset_(offset),
 738         size_(size),
 739         alloc_(alloc),
 740         align_(align)
 741     {
 742     }
 743 };
 744
 745 int main(int argc, const char *argv[]) {
 746     union {
 747         uint16_t word;
 748         uint8_t byte[2];
 749     } endian = {1};
 750
 751     little_ = endian.byte[0];
 752
 753     bool flag_R(false);
 754     bool flag_r(false);
 755
 756     bool flag_t(false);
 757     bool flag_p(false);
 758     bool flag_u(false);
 759     bool flag_e(false);
 760
 761     bool flag_T(false);
 762
 763     bool flag_S(false);
 764     bool flag_s(false);
 765
 766     bool flag_O(false);
 767
 768     bool flag_D(false);
 769     bool flag_d(false);
 770
 771     bool flag_A(false);
 772     bool flag_a(false);
 773
 774     uint32_t flag_CPUType(_not(uint32_t));
 775     uint32_t flag_CPUSubtype(_not(uint32_t));
 776
 777     const char *flag_I(NULL);
 778
 779     bool timeh(false);
 780     uint32_t timev(0);
 781
 782     const void *xmld(NULL);
 783     size_t xmls(0);
 784
 785     uintptr_t noffset(_not(uintptr_t));
 786     uintptr_t woffset(_not(uintptr_t));
 787
 788     std::vector<std::string> files;
 789
 790     if (argc == 1) {
 791         fprintf(stderr, "usage: %s -S[entitlements.xml] <binary>\n", argv[0]);
 792         fprintf(stderr, "   %s -e MobileSafari\n", argv[0]);
 793         fprintf(stderr, "   %s -S cat\n", argv[0]);
 794         fprintf(stderr, "   %s -Stfp.xml gdb\n", argv[0]);
 795         exit(0);
 796     }
 797
 798     for (int argi(1); argi != argc; ++argi)
 799         if (argv[argi][0] != '-')
 800             files.push_back(argv[argi]);
 801         else switch (argv[argi][1]) {
 802             case 'R': flag_R = true; break;
 803             case 'r': flag_r = true; break;
 804
 805             case 't': flag_t = true; break;
 806             case 'u': flag_u = true; break;
 807             case 'p': flag_p = true; break;
 808             case 'e': flag_e = true; break;
 809             case 'O': flag_O = true; break;
 810
 811             case 'D': flag_D = true; break;
 812             case 'd': flag_d = true; break;
 813
 814             case 'a': flag_a = true; break;
 815
 816             case 'A':
 817                 flag_A = true;
 818                 if (argv[argi][2] != '\0') {
 819                     const char *cpu = argv[argi] + 2;
 820                     const char *colon = strchr(cpu, ':');
 821                     _assert(colon != NULL);
 822                     char *arge;
 823                     flag_CPUType = strtoul(cpu, &arge, 0);
 824                     _assert(arge == colon);
 825                     flag_CPUSubtype = strtoul(colon + 1, &arge, 0);
 826                     _assert(arge == argv[argi] + strlen(argv[argi]));
 827                 }
 828             break;
 829
 830             case 's':
 831                 _assert(!flag_S);
 832                 flag_s = true;
 833             break;
 834
 835             case 'S':
 836                 _assert(!flag_s);
 837                 flag_S = true;
 838                 if (argv[argi][2] != '\0') {
 839                     const char *xml = argv[argi] + 2;
 840                     xmld = map(xml, 0, _not(size_t), &xmls, true);
 841                 }
 842             break;
 843
 844             case 'T': {
 845                 flag_T = true;
 846                 if (argv[argi][2] == '-')
 847                     timeh = true;
 848                 else {
 849                     char *arge;
 850                     timev = strtoul(argv[argi] + 2, &arge, 0);
 851                     _assert(arge == argv[argi] + strlen(argv[argi]));
 852                 }
 853             } break;
 854
 855             case 'I': {
 856                 flag_I = argv[argi] + 2;
 857             } break;
 858
 859             case 'n': {
 860                 char *arge;
 861                 noffset = strtoul(argv[argi] + 2, &arge, 0);
 862                 _assert(arge == argv[argi] + strlen(argv[argi]));
 863             } break;
 864
 865             case 'w': {
 866                 char *arge;
 867                 woffset = strtoul(argv[argi] + 2, &arge, 0);
 868                 _assert(arge == argv[argi] + strlen(argv[argi]));
 869             } break;
 870
 871             default:
 872                 goto usage;
 873             break;
 874         }
 875
 876     if (files.empty()) usage: {
 877         exit(0);
 878     }
 879
 880     size_t filei(0), filee(0);
 881     _foreach (file, files) try {
 882         const char *path(file.c_str());
 883         const char *base = strrchr(path, '/');
 884         char *temp(NULL), *dir;
 885
 886         if (base != NULL)
 887             dir = strndup_(path, base++ - path + 1);
 888         else {
 889             dir = strdup("");
 890             base = path;
 891         }
 892
 893         const char *name(flag_I ?: base);
 894
 895         if (flag_r) {
 896             uint32_t clip(0); {
 897                 FatHeader fat_header(Map(path));
 898                 _foreach (mach_header, fat_header.GetMachHeaders()) {
 899                     if (flag_A) {
 900                         if (mach_header.GetCPUType() != flag_CPUType)
 901                             continue;
 902                         if (mach_header.GetCPUSubtype() != flag_CPUSubtype)
 903                             continue;
 904                     }
 905
 906                     mach_header->flags = mach_header.Swap(mach_header.Swap(mach_header->flags) | MH_DYLDLINK);
 907
 908                     uint32_t size(_not(uint32_t)); {
 909                         _foreach (load_command, mach_header.GetLoadCommands()) {
 910                             switch (mach_header.Swap(load_command->cmd)) {
 911                                 case LC_CODE_SIGNATURE: {
 912                                     struct linkedit_data_command *signature = reinterpret_cast<struct linkedit_data_command *>(load_command);
 913                                     memset(reinterpret_cast<uint8_t *>(mach_header.GetBase()) + mach_header.Swap(signature->dataoff), 0, mach_header.Swap(signature->datasize));
 914                                     memset(signature, 0, sizeof(struct linkedit_data_command));
 915
 916                                     mach_header->ncmds = mach_header.Swap(mach_header.Swap(mach_header->ncmds) - 1);
 917                                     mach_header->sizeofcmds = mach_header.Swap(uint32_t(mach_header.Swap(mach_header->sizeofcmds) - sizeof(struct linkedit_data_command)));
 918                                 } break;
 919
 920                                 case LC_SYMTAB: {
 921                                     struct symtab_command *symtab = reinterpret_cast<struct symtab_command *>(load_command);
 922                                     size = mach_header.Swap(symtab->stroff) + mach_header.Swap(symtab->strsize);
 923                                 } break;
 924                             }
 925                         }
 926                     }
 927
 928                     _assert(size != _not(uint32_t));
 929
 930                     _foreach (segment, mach_header.GetSegments("__LINKEDIT")) {
 931                         segment->filesize -= mach_header.GetSize() - size;
 932
 933                         if (fat_arch *fat_arch = mach_header.GetFatArch()) {
 934                             fat_arch->size = fat_header.Swap(size);
 935                             clip = std::max(clip, fat_header.Swap(fat_arch->offset) + size);
 936                         } else
 937                             clip = std::max(clip, size);
 938                     }
 939
 940                     _foreach (segment, mach_header.GetSegments64("__LINKEDIT")) {
 941                         segment->filesize -= mach_header.GetSize() - size;
 942
 943                         if (fat_arch *fat_arch = mach_header.GetFatArch()) {
 944                             fat_arch->size = fat_header.Swap(size);
 945                             clip = std::max(clip, fat_header.Swap(fat_arch->offset) + size);
 946                         } else
 947                             clip = std::max(clip, size);
 948                     }
 949                 }
 950             }
 951
 952             if (clip != 0)
 953                 _syscall(truncate(path, clip));
 954         }
 955
 956         if (flag_S) {
 957             FatHeader source(Map(path));
 958
 959             size_t offset(0);
 960
 961             if (source.IsFat())
 962                 offset += sizeof(fat_header) + sizeof(fat_arch) * source.Swap(source->nfat_arch);
 963
 964             std::vector<CodesignAllocation> allocations; {
 965                 _foreach (mach_header, source.GetMachHeaders()) {
 966                     if (flag_A) {
 967                         if (mach_header.GetCPUType() != flag_CPUType)
 968                             continue;
 969                         if (mach_header.GetCPUSubtype() != flag_CPUSubtype)
 970                             continue;
 971                     }
 972
 973                     mach_header->flags = mach_header.Swap(mach_header.Swap(mach_header->flags) | MH_DYLDLINK);
 974
 975                     size_t size(_not(size_t)); {
 976                         _foreach (load_command, mach_header.GetLoadCommands()) {
 977                             uint32_t cmd(mach_header.Swap(load_command->cmd));
 978                             if (cmd == LC_CODE_SIGNATURE) {
 979                                 struct linkedit_data_command *signature = reinterpret_cast<struct linkedit_data_command *>(load_command);
 980                                 size = mach_header.Swap(signature->dataoff);
 981                                 _assert(size < mach_header.GetSize());
 982                                 break;
 983                             }
 984                         }
 985
 986                         if (size == _not(size_t))
 987                             size = mach_header.GetSize();
 988                     }
 989
 990                     size_t alloc(0);
 991                     alloc += sizeof(struct SuperBlob);
 992                     uint32_t special(0);
 993
 994                     special = std::max(special, CSSLOT_CODEDIRECTORY);
 995                     alloc += sizeof(struct BlobIndex);
 996                     alloc += sizeof(struct CodeDirectory);
 997                     alloc += strlen(name) + 1;
 998
 999                     special = std::max(special, CSSLOT_REQUIREMENTS);
1000                     alloc += sizeof(struct BlobIndex);
1001                     alloc += 0xc;
1002
1003                     if (xmld != NULL) {
1004                         special = std::max(special, CSSLOT_ENTITLEMENTS);
1005                         alloc += sizeof(struct BlobIndex);
1006                         alloc += sizeof(struct Blob);
1007                         alloc += xmls;
1008                     }
1009
1010                     size_t normal((size + 0x1000 - 1) / 0x1000);
1011                     alloc = Align(alloc + (special + normal) * 0x14, 16);
1012
1013                     auto *fat_arch(mach_header.GetFatArch());
1014                     uint32_t align(fat_arch == NULL ? 0 : source.Swap(fat_arch->align));
1015                     offset = Align(offset, 1 << align);
1016
1017                     allocations.push_back(CodesignAllocation(mach_header, offset, size, alloc, align));
1018                     offset += size + alloc;
1019                     offset = Align(offset, 16);
1020                 }
1021             }
1022
1023             asprintf(&temp, "%s.%s.cs", dir, base);
1024             fclose(fopen(temp, "w+"));
1025             _syscall(truncate(temp, offset));
1026
1027             void *file(map(temp, 0, offset, NULL, false));
1028             memset(file, 0, offset);
1029
1030             fat_arch *fat_arch;
1031             if (!source.IsFat())
1032                 fat_arch = NULL;
1033             else {
1034                 auto *fat_header(reinterpret_cast<struct fat_header *>(file));
1035                 fat_header->magic = Swap(FAT_MAGIC);
1036                 fat_header->nfat_arch = Swap(source.Swap(source->nfat_arch));
1037                 fat_arch = reinterpret_cast<struct fat_arch *>(fat_header + 1);
1038             }
1039
1040             _foreach (allocation, allocations) {
1041                 auto &source(allocation.mach_header_);
1042
1043                 uint32_t align(allocation.size_);
1044                 align = Align(align, 0x10);
1045
1046                 if (fat_arch != NULL) {
1047                     fat_arch->cputype = Swap(source->cputype);
1048                     fat_arch->cpusubtype = Swap(source->cpusubtype);
1049                     fat_arch->offset = Swap(allocation.offset_);
1050                     fat_arch->size = Swap(align + allocation.alloc_);
1051                     fat_arch->align = Swap(allocation.align_);
1052                     ++fat_arch;
1053                 }
1054
1055                 void *target(reinterpret_cast<uint8_t *>(file) + allocation.offset_);
1056                 memcpy(target, source, allocation.size_);
1057                 MachHeader mach_header(target, align + allocation.alloc_);
1058
1059                 struct linkedit_data_command *signature(NULL);
1060                 _foreach (load_command, mach_header.GetLoadCommands()) {
1061                     uint32_t cmd(mach_header.Swap(load_command->cmd));
1062                     if (cmd != LC_CODE_SIGNATURE)
1063                         continue;
1064                     signature = reinterpret_cast<struct linkedit_data_command *>(load_command);
1065                     break;
1066                 }
1067
1068                 if (signature == NULL) {
1069                     mach_header->ncmds = mach_header.Swap(mach_header.Swap(mach_header->ncmds) + 1);
1070                     signature = reinterpret_cast<struct linkedit_data_command *>(reinterpret_cast<uint8_t *>(mach_header.GetLoadCommand()) + mach_header.Swap(mach_header->sizeofcmds));
1071                     mach_header->sizeofcmds = mach_header.Swap(mach_header.Swap(mach_header->sizeofcmds) + uint32_t(sizeof(*signature)));
1072                     signature->cmd = mach_header.Swap(LC_CODE_SIGNATURE);
1073                     signature->cmdsize = mach_header.Swap(uint32_t(sizeof(*signature)));
1074                 }
1075
1076                 signature->dataoff = mach_header.Swap(align);
1077                 signature->datasize = mach_header.Swap(allocation.alloc_);
1078
1079                 _foreach (segment, mach_header.GetSegments("__LINKEDIT")) {
1080                     size_t size(mach_header.Swap(align + allocation.alloc_ - mach_header.Swap(segment->fileoff)));
1081                     segment->filesize = size;
1082                     segment->vmsize = Align(size, 0x1000);
1083                 }
1084
1085                 _foreach (segment, mach_header.GetSegments64("__LINKEDIT")) {
1086                     size_t size(mach_header.Swap(align + allocation.alloc_ - mach_header.Swap(segment->fileoff)));
1087                     segment->filesize = size;
1088                     segment->vmsize = Align(size, 0x1000);
1089                 }
1090             }
1091         }
1092
1093         if (flag_p)
1094             printf("path%zu='%s'\n", filei, file.c_str());
1095
1096         FatHeader fat_header(Map(temp == NULL ? path : temp, !(flag_R || flag_T || flag_s || flag_S || flag_O || flag_D)));
1097
1098         _foreach (mach_header, fat_header.GetMachHeaders()) {
1099             struct linkedit_data_command *signature(NULL);
1100             struct encryption_info_command *encryption(NULL);
1101
1102             if (flag_A) {
1103                 if (mach_header.GetCPUType() != flag_CPUType)
1104                     continue;
1105                 if (mach_header.GetCPUSubtype() != flag_CPUSubtype)
1106                     continue;
1107             }
1108
1109             if (flag_a)
1110                 printf("cpu=0x%x:0x%x\n", mach_header.GetCPUType(), mach_header.GetCPUSubtype());
1111
1112             if (flag_d) {
1113                 if (struct fat_arch *fat_arch = mach_header.GetFatArch())
1114                     printf("offset=0x%x\n", Swap(fat_arch->offset));
1115                 else
1116                     printf("offset=0x0\n");
1117             }
1118
1119             if (woffset != _not(uintptr_t)) {
1120                 Pointer<uint32_t> wvalue(mach_header.GetPointer<uint32_t>(woffset));
1121                 if (wvalue == NULL)
1122                     printf("(null) %p\n", reinterpret_cast<void *>(woffset));
1123                 else
1124                     printf("0x%.08x\n", *wvalue);
1125             }
1126
1127             if (noffset != _not(uintptr_t))
1128                 printf("%s\n", &*mach_header.GetPointer<char>(noffset));
1129
1130             if (flag_d)
1131                 _foreach(segment, mach_header.GetSegments("__TEXT")) {
1132                     printf("vmaddr=0x%x\n", mach_header.Swap(segment->vmaddr));
1133                     printf("fileoff=0x%x\n", mach_header.Swap(segment->fileoff));
1134                 }
1135
1136             if (flag_O) {
1137                 _foreach(section, mach_header.GetSections("__TEXT", "__text"))
1138                     section->addr = mach_header.Swap(0);
1139             }
1140
1141             _foreach (load_command, mach_header.GetLoadCommands()) {
1142                 uint32_t cmd(mach_header.Swap(load_command->cmd));
1143
1144                 if (flag_R && cmd == LC_REEXPORT_DYLIB)
1145                     load_command->cmd = mach_header.Swap(LC_LOAD_DYLIB);
1146                 else if (cmd == LC_CODE_SIGNATURE)
1147                     signature = reinterpret_cast<struct linkedit_data_command *>(load_command);
1148                 else if (cmd == LC_ENCRYPTION_INFO)
1149                     encryption = reinterpret_cast<struct encryption_info_command *>(load_command);
1150                 else if (cmd == LC_UUID) {
1151                     volatile struct uuid_command *uuid_command(reinterpret_cast<struct uuid_command *>(load_command));
1152
1153                     if (flag_u) {
1154                         printf("uuid%zu=%.2x%.2x%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x%.2x%.2x%.2x%.2x\n", filei,
1155                             uuid_command->uuid[ 0], uuid_command->uuid[ 1], uuid_command->uuid[ 2], uuid_command->uuid[ 3],
1156                             uuid_command->uuid[ 4], uuid_command->uuid[ 5], uuid_command->uuid[ 6], uuid_command->uuid[ 7],
1157                             uuid_command->uuid[ 8], uuid_command->uuid[ 9], uuid_command->uuid[10], uuid_command->uuid[11],
1158                             uuid_command->uuid[12], uuid_command->uuid[13], uuid_command->uuid[14], uuid_command->uuid[15]
1159                         );
1160                     }
1161                 } else if (cmd == LC_ID_DYLIB) {
1162                     volatile struct dylib_command *dylib_command(reinterpret_cast<struct dylib_command *>(load_command));
1163
1164                     if (flag_t)
1165                         printf("time%zu=0x%.8x\n", filei, mach_header.Swap(dylib_command->dylib.timestamp));
1166
1167                     if (flag_T) {
1168                         uint32_t timed;
1169
1170                         if (!timeh)
1171                             timed = timev;
1172                         else {
1173                             dylib_command->dylib.timestamp = 0;
1174                             timed = hash(reinterpret_cast<uint8_t *>(mach_header.GetBase()), mach_header.GetSize(), timev);
1175                         }
1176
1177                         dylib_command->dylib.timestamp = mach_header.Swap(timed);
1178                     }
1179                 }
1180             }
1181
1182             if (flag_d) {
1183                 _assert(encryption != NULL);
1184
1185                 printf("cryptoff=0x%x\n", mach_header.Swap(encryption->cryptoff));
1186                 printf("cryptsize=0x%x\n", mach_header.Swap(encryption->cryptsize));
1187                 printf("cryptid=0x%x\n", mach_header.Swap(encryption->cryptid));
1188             }
1189
1190             if (flag_D) {
1191                 _assert(encryption != NULL);
1192                 encryption->cryptid = mach_header.Swap(0);
1193             }
1194
1195             if (flag_e) {
1196                 _assert(signature != NULL);
1197
1198                 uint32_t data = mach_header.Swap(signature->dataoff);
1199
1200                 uint8_t *top = reinterpret_cast<uint8_t *>(mach_header.GetBase());
1201                 uint8_t *blob = top + data;
1202                 struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
1203
1204                 for (size_t index(0); index != Swap(super->count); ++index)
1205                     if (Swap(super->index[index].type) == CSSLOT_ENTITLEMENTS) {
1206                         uint32_t begin = Swap(super->index[index].offset);
1207                         struct Blob *entitlements = reinterpret_cast<struct Blob *>(blob + begin);
1208                         fwrite(entitlements + 1, 1, Swap(entitlements->length) - sizeof(struct Blob), stdout);
1209                     }
1210             }
1211
1212             if (flag_s) {
1213                 _assert(signature != NULL);
1214
1215                 uint32_t data = mach_header.Swap(signature->dataoff);
1216
1217                 uint8_t *top = reinterpret_cast<uint8_t *>(mach_header.GetBase());
1218                 uint8_t *blob = top + data;
1219                 struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
1220
1221                 for (size_t index(0); index != Swap(super->count); ++index)
1222                     if (Swap(super->index[index].type) == CSSLOT_CODEDIRECTORY) {
1223                         uint32_t begin = Swap(super->index[index].offset);
1224                         struct CodeDirectory *directory = reinterpret_cast<struct CodeDirectory *>(blob + begin);
1225
1226                         uint8_t (*hashes)[20] = reinterpret_cast<uint8_t (*)[20]>(blob + begin + Swap(directory->hashOffset));
1227                         uint32_t pages = Swap(directory->nCodeSlots);
1228
1229                         if (pages != 1)
1230                             for (size_t i = 0; i != pages - 1; ++i)
1231                                 sha1(hashes[i], top + 0x1000 * i, 0x1000);
1232                         if (pages != 0)
1233                             sha1(hashes[pages - 1], top + 0x1000 * (pages - 1), ((data - 1) % 0x1000) + 1);
1234                     }
1235             }
1236
1237             if (flag_S) {
1238                 _assert(signature != NULL);
1239
1240                 uint32_t data = mach_header.Swap(signature->dataoff);
1241                 uint32_t size = mach_header.Swap(signature->datasize);
1242
1243                 uint8_t *top = reinterpret_cast<uint8_t *>(mach_header.GetBase());
1244                 uint8_t *blob = top + data;
1245                 struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
1246                 super->blob.magic = Swap(CSMAGIC_EMBEDDED_SIGNATURE);
1247
1248                 uint32_t count = xmld == NULL ? 2 : 3;
1249                 uint32_t offset = sizeof(struct SuperBlob) + count * sizeof(struct BlobIndex);
1250
1251                 super->index[0].type = Swap(CSSLOT_CODEDIRECTORY);
1252                 super->index[0].offset = Swap(offset);
1253
1254                 uint32_t begin = offset;
1255                 struct CodeDirectory *directory = reinterpret_cast<struct CodeDirectory *>(blob + begin);
1256                 offset += sizeof(struct CodeDirectory);
1257
1258                 directory->blob.magic = Swap(CSMAGIC_CODEDIRECTORY);
1259                 directory->version = Swap(uint32_t(0x00020001));
1260                 directory->flags = Swap(uint32_t(0));
1261                 directory->codeLimit = Swap(data);
1262                 directory->hashSize = 0x14;
1263                 directory->hashType = 0x01;
1264                 directory->spare1 = 0x00;
1265                 directory->pageSize = 0x0c;
1266                 directory->spare2 = Swap(uint32_t(0));
1267
1268                 directory->identOffset = Swap(offset - begin);
1269                 strcpy(reinterpret_cast<char *>(blob + offset), name);
1270                 offset += strlen(name) + 1;
1271
1272                 uint32_t special = xmld == NULL ? CSSLOT_REQUIREMENTS : CSSLOT_ENTITLEMENTS;
1273                 directory->nSpecialSlots = Swap(special);
1274
1275                 uint8_t (*hashes)[20] = reinterpret_cast<uint8_t (*)[20]>(blob + offset);
1276                 memset(hashes, 0, sizeof(*hashes) * special);
1277
1278                 offset += sizeof(*hashes) * special;
1279                 hashes += special;
1280
1281                 uint32_t pages = (data + 0x1000 - 1) / 0x1000;
1282                 directory->nCodeSlots = Swap(pages);
1283
1284                 if (pages != 1)
1285                     for (size_t i = 0; i != pages - 1; ++i)
1286                         sha1(hashes[i], top + 0x1000 * i, 0x1000);
1287                 if (pages != 0)
1288                     sha1(hashes[pages - 1], top + 0x1000 * (pages - 1), ((data - 1) % 0x1000) + 1);
1289
1290                 directory->hashOffset = Swap(offset - begin);
1291                 offset += sizeof(*hashes) * pages;
1292                 directory->blob.length = Swap(offset - begin);
1293
1294                 super->index[1].type = Swap(CSSLOT_REQUIREMENTS);
1295                 super->index[1].offset = Swap(offset);
1296
1297                 memcpy(blob + offset, "\xfa\xde\x0c\x01\x00\x00\x00\x0c\x00\x00\x00\x00", 0xc);
1298                 offset += 0xc;
1299
1300                 if (xmld != NULL) {
1301                     super->index[2].type = Swap(CSSLOT_ENTITLEMENTS);
1302                     super->index[2].offset = Swap(offset);
1303
1304                     uint32_t begin = offset;
1305                     struct Blob *entitlements = reinterpret_cast<struct Blob *>(blob + begin);
1306                     offset += sizeof(struct Blob);
1307
1308                     memcpy(blob + offset, xmld, xmls);
1309                     offset += xmls;
1310
1311                     entitlements->magic = Swap(CSMAGIC_ENTITLEMENTS);
1312                     entitlements->length = Swap(offset - begin);
1313                 }
1314
1315                 for (size_t index(0); index != count; ++index) {
1316                     uint32_t type = Swap(super->index[index].type);
1317                     if (type != 0 && type <= special) {
1318                         uint32_t offset = Swap(super->index[index].offset);
1319                         struct Blob *local = (struct Blob *) (blob + offset);
1320                         sha1((uint8_t *) (hashes - type), (uint8_t *) local, Swap(local->length));
1321                     }
1322                 }
1323
1324                 super->count = Swap(count);
1325                 super->blob.length = Swap(offset);
1326
1327                 if (offset > size) {
1328                     fprintf(stderr, "offset (%u) > size (%u)\n", offset, size);
1329                     _assert(false);
1330                 } //else fprintf(stderr, "offset (%zu) <= size (%zu)\n", offset, size);
1331
1332                 memset(blob + offset, 0, size - offset);
1333             }
1334         }
1335
1336         if (flag_S) {
1337             uint8_t *top = reinterpret_cast<uint8_t *>(fat_header.GetBase());
1338             size_t size = fat_header.GetSize();
1339
1340             char *copy;
1341             asprintf(&copy, "%s.%s.cp", dir, base);
1342             FILE *file = fopen(copy, "w+");
1343             size_t writ = fwrite(top, 1, size, file);
1344             _assert(writ == size);
1345             fclose(file);
1346
1347             _syscall(unlink(temp));
1348             free(temp);
1349             temp = copy;
1350         }
1351
1352         if (temp != NULL) {
1353             struct stat info;
1354             _syscall(stat(path, &info));
1355             _syscall(chown(temp, info.st_uid, info.st_gid));
1356             _syscall(chmod(temp, info.st_mode));
1357             _syscall(unlink(path));
1358             _syscall(rename(temp, path));
1359             free(temp);
1360         }
1361
1362         free(dir);
1363         ++filei;
1364     } catch (const char *) {
1365         ++filee;
1366         ++filei;
1367     }
1368
1369     return filee;
1370 }