ldid.cpp

   1 /* JocStrap - Java/Objective-C Bootstrap
   2  * Copyright (C) 2007  Jay Freeman (saurik)
   3 */
   4
   5 /*
   6  *        Redistribution and use in source and binary
   7  * forms, with or without modification, are permitted
   8  * provided that the following conditions are met:
   9  *
  10  * 1. Redistributions of source code must retain the
  11  *    above copyright notice, this list of conditions
  12  *    and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the
  14  *    above copyright notice, this list of conditions
  15  *    and the following disclaimer in the documentation
  16  *    and/or other materials provided with the
  17  *    distribution.
  18  * 3. The name of the author may not be used to endorse
  19  *    or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
  23  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
  24  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
  27  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  28  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  29  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  30  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  32  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  33  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  34  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  35  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36 */
  37
  38 #include "minimal/stdlib.h"
  39 #include "minimal/string.h"
  40 #include "minimal/mapping.h"
  41
  42 #include "sha1.h"
  43
  44 #include <cstring>
  45 #include <string>
  46 #include <vector>
  47
  48 #include <sys/wait.h>
  49 #include <sys/types.h>
  50 #include <sys/stat.h>
  51
  52 struct fat_header {
  53     uint32_t magic;
  54     uint32_t nfat_arch;
  55 } _packed;
  56
  57 #define FAT_MAGIC 0xcafebabe
  58 #define FAT_CIGAM 0xbebafeca
  59
  60 struct fat_arch {
  61     uint32_t cputype;
  62     uint32_t cpusubtype;
  63     uint32_t offset;
  64     uint32_t size;
  65     uint32_t align;
  66 } _packed;
  67
  68 struct mach_header {
  69     uint32_t magic;
  70     uint32_t cputype;
  71     uint32_t cpusubtype;
  72     uint32_t filetype;
  73     uint32_t ncmds;
  74     uint32_t sizeofcmds;
  75     uint32_t flags;
  76 } _packed;
  77
  78 #define MH_MAGIC 0xfeedface
  79 #define MH_CIGAM 0xcefaedfe
  80
  81 #define MH_MAGIC_64 0xfeedfacf
  82 #define MH_CIGAM_64 0xcffaedfe
  83
  84 #define MH_DYLDLINK   0x4
  85
  86 #define MH_EXECUTE    0x2
  87 #define MH_DYLIB      0x6
  88 #define MH_BUNDLE     0x8
  89 #define MH_DYLIB_STUB 0x9
  90
  91 struct load_command {
  92     uint32_t cmd;
  93     uint32_t cmdsize;
  94 } _packed;
  95
  96 #define LC_REQ_DYLD  uint32_t(0x80000000)
  97
  98 #define LC_SEGMENT         uint32_t(0x01)
  99 #define LC_LOAD_DYLIB      uint32_t(0x0c)
 100 #define LC_ID_DYLIB        uint32_t(0x0d)
 101 #define LC_UUID            uint32_t(0x1b)
 102 #define LC_CODE_SIGNATURE  uint32_t(0x1d)
 103 #define LC_REEXPORT_DYLIB  uint32_t(0x1f | LC_REQ_DYLD)
 104
 105 struct dylib {
 106     uint32_t name;
 107     uint32_t timestamp;
 108     uint32_t current_version;
 109     uint32_t compatibility_version;
 110 } _packed;
 111
 112 struct dylib_command {
 113     uint32_t cmd;
 114     uint32_t cmdsize;
 115     struct dylib dylib;
 116 } _packed;
 117
 118 struct uuid_command {
 119     uint32_t cmd;
 120     uint32_t cmdsize;
 121     uint8_t uuid[16];
 122 } _packed;
 123
 124 struct segment_command {
 125     uint32_t cmd;
 126     uint32_t cmdsize;
 127     char segname[16];
 128     uint32_t vmaddr;
 129     uint32_t vmsize;
 130     uint32_t fileoff;
 131     uint32_t filesize;
 132     uint32_t maxprot;
 133     uint32_t initprot;
 134     uint32_t nsects;
 135     uint32_t flags;
 136 };
 137
 138 struct section {
 139     char sectname[16];
 140     char segname[16];
 141     uint32_t addr;
 142     uint32_t size;
 143     uint32_t offset;
 144     uint32_t align;
 145     uint32_t reloff;
 146     uint32_t nreloc;
 147     uint32_t flags;
 148     uint32_t reserved1;
 149     uint32_t reserved2;
 150 };
 151
 152 struct linkedit_data_command {
 153     uint32_t cmd;
 154     uint32_t cmdsize;
 155     uint32_t dataoff;
 156     uint32_t datasize;
 157 } _packed;
 158
 159 uint16_t Swap_(uint16_t value) {
 160     return
 161         ((value >>  8) & 0x00ff) |
 162         ((value <<  8) & 0xff00);
 163 }
 164
 165 uint32_t Swap_(uint32_t value) {
 166     value = ((value >>  8) & 0x00ff00ff) |
 167             ((value <<  8) & 0xff00ff00);
 168     value = ((value >> 16) & 0x0000ffff) |
 169             ((value << 16) & 0xffff0000);
 170     return value;
 171 }
 172
 173 int16_t Swap_(int16_t value) {
 174     return Swap_(static_cast<uint16_t>(value));
 175 }
 176
 177 int32_t Swap_(int32_t value) {
 178     return Swap_(static_cast<uint32_t>(value));
 179 }
 180
 181 uint16_t Swap(uint16_t value) {
 182     return true ? Swap_(value) : value;
 183 }
 184
 185 uint32_t Swap(uint32_t value) {
 186     return true ? Swap_(value) : value;
 187 }
 188
 189 int16_t Swap(int16_t value) {
 190     return Swap(static_cast<uint16_t>(value));
 191 }
 192
 193 int32_t Swap(int32_t value) {
 194     return Swap(static_cast<uint32_t>(value));
 195 }
 196
 197 template <typename Target_>
 198 class Pointer;
 199
 200 class Framework {
 201   private:
 202     void *base_;
 203     size_t size_;
 204
 205     struct mach_header *mach_header_;
 206     struct load_command *load_command_;
 207
 208     bool swapped_;
 209     bool bits64_;
 210
 211   public:
 212     uint16_t Swap(uint16_t value) const {
 213         return swapped_ ? Swap_(value) : value;
 214     }
 215
 216     uint32_t Swap(uint32_t value) const {
 217         return swapped_ ? Swap_(value) : value;
 218     }
 219
 220     int16_t Swap(int16_t value) const {
 221         return Swap(static_cast<uint16_t>(value));
 222     }
 223
 224     int32_t Swap(int32_t value) const {
 225         return Swap(static_cast<uint32_t>(value));
 226     }
 227
 228     Framework(const char *framework_path) :
 229         swapped_(false)
 230     {
 231         base_ = map(framework_path, 0, _not(size_t), &size_, false);
 232         fat_header *fat_header = reinterpret_cast<struct fat_header *>(base_);
 233
 234         if (Swap(fat_header->magic) == FAT_CIGAM) {
 235             swapped_ = !swapped_;
 236             goto fat;
 237         } else if (Swap(fat_header->magic) != FAT_MAGIC)
 238             mach_header_ = (mach_header *) base_;
 239         else fat: {
 240             size_t fat_narch = Swap(fat_header->nfat_arch);
 241             fat_arch *fat_arch = reinterpret_cast<struct fat_arch *>(fat_header + 1);
 242             size_t arch;
 243             for (arch = 0; arch != fat_narch; ++arch) {
 244                 uint32_t arch_offset = Swap(fat_arch->offset);
 245                 mach_header_ = (mach_header *) ((uint8_t *) base_ + arch_offset);
 246                 goto found;
 247                 ++fat_arch;
 248             }
 249
 250             _assert(false);
 251         }
 252
 253       found:
 254         switch (Swap(mach_header_->magic)) {
 255             case MH_CIGAM:
 256                 swapped_ = !swapped_;
 257             case MH_MAGIC:
 258                 bits64_ = false;
 259             break;
 260
 261             case MH_CIGAM_64:
 262                 swapped_ = !swapped_;
 263             case MH_MAGIC_64:
 264                 bits64_ = true;
 265             break;
 266
 267             default:
 268                 _assert(false);
 269         }
 270
 271         void *post = mach_header_ + 1;
 272         if (bits64_)
 273             post = (uint32_t *) post + 1;
 274         load_command_ = (struct load_command *) post;
 275
 276         _assert(
 277             Swap(mach_header_->filetype) == MH_EXECUTE ||
 278             Swap(mach_header_->filetype) == MH_DYLIB ||
 279             Swap(mach_header_->filetype) == MH_BUNDLE
 280         );
 281     }
 282
 283     struct mach_header *operator ->() const {
 284         return mach_header_;
 285     }
 286
 287     void *GetBase() {
 288         return base_;
 289     }
 290
 291     size_t GetSize() const {
 292         return size_;
 293     }
 294
 295     uint32_t GetCPUType() const {
 296         return Swap(mach_header_->cputype);
 297     }
 298
 299     uint16_t GetCPUSubtype() const {
 300         return Swap(mach_header_->cpusubtype) & 0xff;
 301     }
 302
 303     std::vector<struct load_command *> GetLoadCommands() {
 304         std::vector<struct load_command *> load_commands;
 305
 306         struct load_command *load_command = load_command_;
 307         for (uint32_t cmd = 0; cmd != Swap(mach_header_->ncmds); ++cmd) {
 308             load_commands.push_back(load_command);
 309             load_command = (struct load_command *) ((uint8_t *) load_command + Swap(load_command->cmdsize));
 310         }
 311
 312         return load_commands;
 313     }
 314
 315     std::vector<segment_command *> GetSegments(const char *segment_name) {
 316         std::vector<struct segment_command *> segment_commands;
 317
 318         _foreach (load_command, GetLoadCommands())
 319             if (Swap((*load_command)->cmd) == LC_SEGMENT) {
 320                 segment_command *segment_command = reinterpret_cast<struct segment_command *>(*load_command);
 321                 if (strncmp(segment_command->segname, segment_name, 16) == 0)
 322                     segment_commands.push_back(segment_command);
 323             }
 324
 325         return segment_commands;
 326     }
 327
 328     std::vector<section *> GetSections(const char *segment_name, const char *section_name) {
 329         std::vector<section *> sections;
 330
 331         _foreach (segment, GetSegments(segment_name)) {
 332             section *section = (struct section *) (*segment + 1);
 333
 334             uint32_t sect;
 335             for (sect = 0; sect != Swap((*segment)->nsects); ++sect) {
 336                 if (strncmp(section->sectname, section_name, 16) == 0)
 337                     sections.push_back(section);
 338                 ++section;
 339             }
 340         }
 341
 342         return sections;
 343     }
 344
 345     template <typename Target_>
 346     Pointer<Target_> GetPointer(uint32_t address, const char *segment_name = NULL) {
 347         load_command *load_command = (struct load_command *) (mach_header_ + 1);
 348         uint32_t cmd;
 349
 350         for (cmd = 0; cmd != Swap(mach_header_->ncmds); ++cmd) {
 351             if (Swap(load_command->cmd) == LC_SEGMENT) {
 352                 segment_command *segment_command = (struct segment_command *) load_command;
 353                 if (segment_name != NULL && strncmp(segment_command->segname, segment_name, 16) != 0)
 354                     goto next_command;
 355
 356                 section *sections = (struct section *) (segment_command + 1);
 357
 358                 uint32_t sect;
 359                 for (sect = 0; sect != Swap(segment_command->nsects); ++sect) {
 360                     section *section = &sections[sect];
 361                     //printf("%s %u %p %p %u\n", segment_command->segname, sect, address, section->addr, section->size);
 362                     if (address >= Swap(section->addr) && address < Swap(section->addr) + Swap(section->size)) {
 363                         //printf("0x%.8x %s\n", address, segment_command->segname);
 364                         return Pointer<Target_>(this, reinterpret_cast<Target_ *>(address - Swap(section->addr) + Swap(section->offset) + (char *) mach_header_));
 365                     }
 366                 }
 367             }
 368
 369           next_command:
 370             load_command = (struct load_command *) ((char *) load_command + Swap(load_command->cmdsize));
 371         }
 372
 373         return Pointer<Target_>(this);
 374     }
 375
 376     template <typename Target_>
 377     Pointer<Target_> GetOffset(uint32_t offset) {
 378         return Pointer<Target_>(this, reinterpret_cast<Target_ *>(offset + (uint8_t *) mach_header_));
 379     }
 380 };
 381
 382 template <typename Target_>
 383 class Pointer {
 384   private:
 385     const Framework *framework_;
 386     const Target_ *pointer_;
 387
 388   public:
 389     Pointer(const Framework *framework = NULL, const Target_ *pointer = NULL) :
 390         framework_(framework),
 391         pointer_(pointer)
 392     {
 393     }
 394
 395     operator const Target_ *() const {
 396         return pointer_;
 397     }
 398
 399     const Target_ *operator ->() const {
 400         return pointer_;
 401     }
 402
 403     Pointer<Target_> &operator ++() {
 404         ++pointer_;
 405         return *this;
 406     }
 407
 408     template <typename Value_>
 409     Value_ Swap(Value_ value) {
 410         return framework_->Swap(value);
 411     }
 412 };
 413
 414 #define CSMAGIC_CODEDIRECTORY      uint32_t(0xfade0c02)
 415 #define CSMAGIC_EMBEDDED_SIGNATURE uint32_t(0xfade0cc0)
 416 #define CSMAGIC_ENTITLEMENTS       uint32_t(0xfade7171)
 417
 418 #define CSSLOT_CODEDIRECTORY uint32_t(0)
 419 #define CSSLOT_REQUIREMENTS  uint32_t(2)
 420 #define CSSLOT_ENTITLEMENTS  uint32_t(5)
 421
 422 struct BlobIndex {
 423     uint32_t type;
 424     uint32_t offset;
 425 } _packed;
 426
 427 struct Blob {
 428     uint32_t magic;
 429     uint32_t length;
 430 } _packed;
 431
 432 struct SuperBlob {
 433     struct Blob blob;
 434     uint32_t count;
 435     struct BlobIndex index[];
 436 } _packed;
 437
 438 struct CodeDirectory {
 439     struct Blob blob;
 440     uint32_t version;
 441     uint32_t flags;
 442     uint32_t hashOffset;
 443     uint32_t identOffset;
 444     uint32_t nSpecialSlots;
 445     uint32_t nCodeSlots;
 446     uint32_t codeLimit;
 447     uint8_t hashSize;
 448     uint8_t hashType;
 449     uint8_t spare1;
 450     uint8_t pageSize;
 451     uint32_t spare2;
 452 } _packed;
 453
 454 extern "C" uint32_t hash(uint8_t *k, uint32_t length, uint32_t initval);
 455
 456 #define CODESIGN_ALLOCATE "arm-apple-darwin9-codesign_allocate"
 457
 458 void sha1(uint8_t *hash, uint8_t *data, size_t size) {
 459     SHA1Context context;
 460     SHA1Reset(&context);
 461     SHA1Input(&context, data, size);
 462     SHA1Result(&context, hash);
 463 }
 464
 465 int main(int argc, const char *argv[]) {
 466     bool flag_R(false);
 467     bool flag_t(false);
 468     bool flag_p(false);
 469     bool flag_u(false);
 470     bool flag_e(false);
 471
 472     bool flag_T(false);
 473
 474     bool flag_S(false);
 475     bool flag_s(false);
 476
 477     bool timeh(false);
 478     uint32_t timev(0);
 479
 480     const void *xmld(NULL);
 481     size_t xmls(0);
 482
 483     uintptr_t noffset(_not(uintptr_t));
 484     uintptr_t woffset(_not(uintptr_t));
 485
 486     std::vector<std::string> files;
 487
 488     if (argc == 1) {
 489         fprintf(stderr, "usage: %s -S[entitlements.xml] <binary>\n", argv[0]);
 490         fprintf(stderr, "   %s -e MobileSafari\n", argv[0]);
 491         fprintf(stderr, "   %s -S cat\n", argv[0]);
 492         fprintf(stderr, "   %s -Stfp.xml gdb\n", argv[0]);
 493         exit(0);
 494     }
 495
 496     for (int argi(1); argi != argc; ++argi)
 497         if (argv[argi][0] != '-')
 498             files.push_back(argv[argi]);
 499         else switch (argv[argi][1]) {
 500             case 'R': flag_R = true; break;
 501             case 't': flag_t = true; break;
 502             case 'u': flag_u = true; break;
 503             case 'p': flag_p = true; break;
 504             case 'e': flag_e = true; break;
 505
 506             case 's':
 507                 _assert(!flag_S);
 508                 flag_s = true;
 509             break;
 510
 511             case 'S':
 512                 _assert(!flag_s);
 513                 flag_S = true;
 514                 if (argv[argi][2] != '\0') {
 515                     const char *xml = argv[argi] + 2;
 516                     xmld = map(xml, 0, _not(size_t), &xmls, true);
 517                 }
 518             break;
 519
 520             case 'T': {
 521                 flag_T = true;
 522                 if (argv[argi][2] == '-')
 523                     timeh = true;
 524                 else {
 525                     char *arge;
 526                     timev = strtoul(argv[argi] + 2, &arge, 0);
 527                     _assert(arge == argv[argi] + strlen(argv[argi]));
 528                 }
 529             } break;
 530
 531             case 'n': {
 532                 char *arge;
 533                 noffset = strtoul(argv[argi] + 2, &arge, 0);
 534                 _assert(arge == argv[argi] + strlen(argv[argi]));
 535             } break;
 536
 537             case 'w': {
 538                 char *arge;
 539                 woffset = strtoul(argv[argi] + 2, &arge, 0);
 540                 _assert(arge == argv[argi] + strlen(argv[argi]));
 541             } break;
 542
 543             default:
 544                 goto usage;
 545             break;
 546         }
 547
 548     if (files.empty()) usage: {
 549         exit(0);
 550     }
 551
 552     size_t filei(0), filee(0);
 553     _foreach (file, files) try {
 554         const char *path(file->c_str());
 555         const char *base = strrchr(path, '/');
 556         char *temp(NULL), *dir;
 557
 558         if (base != NULL)
 559             dir = strndup_(path, base++ - path + 1);
 560         else {
 561             dir = strdup("");
 562             base = path;
 563         }
 564
 565         if (flag_S) {
 566             asprintf(&temp, "%s.%s.cs", dir, base);
 567             const char *allocate = getenv("CODESIGN_ALLOCATE");
 568             if (allocate == NULL)
 569                 allocate = "codesign_allocate";
 570
 571             size_t size = _not(size_t);
 572             const char *arch; {
 573                 Framework framework(path);
 574                 framework->flags |= MH_DYLDLINK;
 575
 576                 _foreach (load_command, framework.GetLoadCommands()) {
 577                     uint32_t cmd(framework.Swap((*load_command)->cmd));
 578                     if (cmd == LC_CODE_SIGNATURE) {
 579                         struct linkedit_data_command *signature = reinterpret_cast<struct linkedit_data_command *>(*load_command);
 580                         size = framework.Swap(signature->dataoff);
 581                         _assert(size < framework.GetSize());
 582                         break;
 583                     }
 584                 }
 585
 586                 if (size == _not(size_t))
 587                     size = framework.GetSize();
 588
 589                 switch (framework.GetCPUType()) {
 590                     case 7: switch (framework.GetCPUSubtype()) {
 591                         case 3: arch = "i386"; break;
 592                         default: arch = NULL; break;
 593                     } break;
 594
 595                     case 12: switch (framework.GetCPUSubtype()) {
 596                         case 0: arch = "arm"; break;
 597                         case 6: arch = "armv6"; break;
 598                         case 9: arch = "armv7"; break;
 599                         default: arch = NULL; break;
 600                     } break;
 601
 602                     case 18: switch (framework.GetCPUSubtype()) {
 603                         case 10: arch = "ppc7400"; break;
 604                         default: arch = NULL; break;
 605                     } break;
 606
 607                     case 16777223: switch (framework.GetCPUSubtype()) {
 608                         case 3: arch = "x86_64"; break;
 609                         default: arch = NULL; break;
 610                     } break;
 611
 612                     case 16777234: switch (framework.GetCPUSubtype()) {
 613                         case 0: arch = "ppc64"; break;
 614                         default: arch = NULL; break;
 615                     } break;
 616
 617                     default: arch = NULL; break;
 618                 }
 619             }
 620
 621             _assert(arch != NULL);
 622
 623             pid_t pid = fork();
 624             _syscall(pid);
 625             if (pid == 0) {
 626                 char *ssize;
 627                 asprintf(&ssize, "%u", (sizeof(struct SuperBlob) + 2 * sizeof(struct BlobIndex) + sizeof(struct CodeDirectory) + strlen(base) + 1 + ((xmld == NULL ? CSSLOT_REQUIREMENTS : CSSLOT_ENTITLEMENTS) + (size + 0x1000 - 1) / 0x1000) * 0x14 + 0xc + (xmld == NULL ? 0 : 0x10 + xmls) + 15) / 16 * 16);
 628                 //printf("%s -i %s -a %s %s -o %s\n", allocate, path, arch, ssize, temp);
 629                 execlp(allocate, allocate, "-i", path, "-a", arch, ssize, "-o", temp, NULL);
 630                 _assert(false);
 631             }
 632
 633             int status;
 634             _syscall(waitpid(pid, &status, 0));
 635             _assert(WIFEXITED(status));
 636             _assert(WEXITSTATUS(status) == 0);
 637         }
 638
 639         Framework framework(temp == NULL ? path : temp);
 640         struct linkedit_data_command *signature(NULL);
 641
 642         if (flag_p)
 643             printf("path%zu='%s'\n", filei, file->c_str());
 644
 645         if (woffset != _not(uintptr_t)) {
 646             Pointer<uint32_t> wvalue(framework.GetPointer<uint32_t>(woffset));
 647             if (wvalue == NULL)
 648                 printf("(null) %p\n", reinterpret_cast<void *>(woffset));
 649             else
 650                 printf("0x%.08x\n", *wvalue);
 651         }
 652
 653         if (noffset != _not(uintptr_t))
 654             printf("%s\n", &*framework.GetPointer<char>(noffset));
 655
 656         _foreach (load_command, framework.GetLoadCommands()) {
 657             uint32_t cmd(framework.Swap((*load_command)->cmd));
 658
 659             if (flag_R && cmd == LC_REEXPORT_DYLIB)
 660                 (*load_command)->cmd = framework.Swap(LC_LOAD_DYLIB);
 661             else if (cmd == LC_CODE_SIGNATURE)
 662                 signature = reinterpret_cast<struct linkedit_data_command *>(*load_command);
 663             else if (cmd == LC_UUID) {
 664                 volatile struct uuid_command *uuid_command(reinterpret_cast<struct uuid_command *>(*load_command));
 665
 666                 if (flag_u) {
 667                     printf("uuid%zu=%.2x%.2x%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x%.2x%.2x%.2x%.2x\n", filei,
 668                         uuid_command->uuid[ 0], uuid_command->uuid[ 1], uuid_command->uuid[ 2], uuid_command->uuid[ 3],
 669                         uuid_command->uuid[ 4], uuid_command->uuid[ 5], uuid_command->uuid[ 6], uuid_command->uuid[ 7],
 670                         uuid_command->uuid[ 8], uuid_command->uuid[ 9], uuid_command->uuid[10], uuid_command->uuid[11],
 671                         uuid_command->uuid[12], uuid_command->uuid[13], uuid_command->uuid[14], uuid_command->uuid[15]
 672                     );
 673                 }
 674             } else if (cmd == LC_ID_DYLIB) {
 675                 volatile struct dylib_command *dylib_command(reinterpret_cast<struct dylib_command *>(*load_command));
 676
 677                 if (flag_t)
 678                     printf("time%zu=0x%.8x\n", filei, framework.Swap(dylib_command->dylib.timestamp));
 679
 680                 if (flag_T) {
 681                     uint32_t timed;
 682
 683                     if (!timeh)
 684                         timed = timev;
 685                     else {
 686                         dylib_command->dylib.timestamp = 0;
 687                         timed = hash(reinterpret_cast<uint8_t *>(framework.GetBase()), framework.GetSize(), timev);
 688                     }
 689
 690                     dylib_command->dylib.timestamp = framework.Swap(timed);
 691                 }
 692             }
 693         }
 694
 695         if (flag_e) {
 696             _assert(signature != NULL);
 697
 698             uint32_t data = framework.Swap(signature->dataoff);
 699             uint32_t size = framework.Swap(signature->datasize);
 700
 701             uint8_t *top = reinterpret_cast<uint8_t *>(framework.GetBase());
 702             uint8_t *blob = top + data;
 703             struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
 704
 705             for (size_t index(0); index != Swap(super->count); ++index)
 706                 if (Swap(super->index[index].type) == CSSLOT_ENTITLEMENTS) {
 707                     uint32_t begin = Swap(super->index[index].offset);
 708                     struct Blob *entitlements = reinterpret_cast<struct Blob *>(blob + begin);
 709                     fwrite(entitlements + 1, 1, Swap(entitlements->length) - sizeof(struct Blob), stdout);
 710                 }
 711         }
 712
 713         if (flag_s) {
 714             _assert(signature != NULL);
 715
 716             uint32_t data = framework.Swap(signature->dataoff);
 717             uint32_t size = framework.Swap(signature->datasize);
 718
 719             uint8_t *top = reinterpret_cast<uint8_t *>(framework.GetBase());
 720             uint8_t *blob = top + data;
 721             struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
 722
 723             for (size_t index(0); index != Swap(super->count); ++index)
 724                 if (Swap(super->index[index].type) == CSSLOT_CODEDIRECTORY) {
 725                     uint32_t begin = Swap(super->index[index].offset);
 726                     struct CodeDirectory *directory = reinterpret_cast<struct CodeDirectory *>(blob + begin);
 727
 728                     uint8_t (*hashes)[20] = reinterpret_cast<uint8_t (*)[20]>(blob + begin + Swap(directory->hashOffset));
 729                     uint32_t pages = Swap(directory->nCodeSlots);
 730
 731                     if (pages != 1)
 732                         for (size_t i = 0; i != pages - 1; ++i)
 733                             sha1(hashes[i], top + 0x1000 * i, 0x1000);
 734                     if (pages != 0)
 735                         sha1(hashes[pages - 1], top + 0x1000 * (pages - 1), ((data - 1) % 0x1000) + 1);
 736                 }
 737         }
 738
 739         if (flag_S) {
 740             _assert(signature != NULL);
 741
 742             uint32_t data = framework.Swap(signature->dataoff);
 743             uint32_t size = framework.Swap(signature->datasize);
 744
 745             uint8_t *top = reinterpret_cast<uint8_t *>(framework.GetBase());
 746             uint8_t *blob = top + data;
 747             struct SuperBlob *super = reinterpret_cast<struct SuperBlob *>(blob);
 748             super->blob.magic = Swap(CSMAGIC_EMBEDDED_SIGNATURE);
 749
 750             uint32_t count = xmld == NULL ? 2 : 3;
 751             uint32_t offset = sizeof(struct SuperBlob) + count * sizeof(struct BlobIndex);
 752
 753             super->index[0].type = Swap(CSSLOT_CODEDIRECTORY);
 754             super->index[0].offset = Swap(offset);
 755
 756             uint32_t begin = offset;
 757             struct CodeDirectory *directory = reinterpret_cast<struct CodeDirectory *>(blob + begin);
 758             offset += sizeof(struct CodeDirectory);
 759
 760             directory->blob.magic = Swap(CSMAGIC_CODEDIRECTORY);
 761             directory->version = Swap(uint32_t(0x00020001));
 762             directory->flags = Swap(uint32_t(0));
 763             directory->codeLimit = Swap(data);
 764             directory->hashSize = 0x14;
 765             directory->hashType = 0x01;
 766             directory->spare1 = 0x00;
 767             directory->pageSize = 0x0c;
 768             directory->spare2 = Swap(uint32_t(0));
 769
 770             directory->identOffset = Swap(offset - begin);
 771             strcpy(reinterpret_cast<char *>(blob + offset), base);
 772             offset += strlen(base) + 1;
 773
 774             uint32_t special = xmld == NULL ? CSSLOT_REQUIREMENTS : CSSLOT_ENTITLEMENTS;
 775             directory->nSpecialSlots = Swap(special);
 776
 777             uint8_t (*hashes)[20] = reinterpret_cast<uint8_t (*)[20]>(blob + offset);
 778             memset(hashes, 0, sizeof(*hashes) * special);
 779
 780             offset += sizeof(*hashes) * special;
 781             hashes += special;
 782
 783             uint32_t pages = (data + 0x1000 - 1) / 0x1000;
 784             directory->nCodeSlots = Swap(pages);
 785
 786             if (pages != 1)
 787                 for (size_t i = 0; i != pages - 1; ++i)
 788                     sha1(hashes[i], top + 0x1000 * i, 0x1000);
 789             if (pages != 0)
 790                 sha1(hashes[pages - 1], top + 0x1000 * (pages - 1), ((data - 1) % 0x1000) + 1);
 791
 792             directory->hashOffset = Swap(offset - begin);
 793             offset += sizeof(*hashes) * pages;
 794             directory->blob.length = Swap(offset - begin);
 795
 796             super->index[1].type = Swap(CSSLOT_REQUIREMENTS);
 797             super->index[1].offset = Swap(offset);
 798
 799             memcpy(blob + offset, "\xfa\xde\x0c\x01\x00\x00\x00\x0c\x00\x00\x00\x00", 0xc);
 800             offset += 0xc;
 801
 802             if (xmld != NULL) {
 803                 super->index[2].type = Swap(CSSLOT_ENTITLEMENTS);
 804                 super->index[2].offset = Swap(offset);
 805
 806                 uint32_t begin = offset;
 807                 struct Blob *entitlements = reinterpret_cast<struct Blob *>(blob + begin);
 808                 offset += sizeof(struct Blob);
 809
 810                 memcpy(blob + offset, xmld, xmls);
 811                 offset += xmls;
 812
 813                 entitlements->magic = Swap(CSMAGIC_ENTITLEMENTS);
 814                 entitlements->length = Swap(offset - begin);
 815             }
 816
 817             for (size_t index(0); index != count; ++index) {
 818                 uint32_t type = Swap(super->index[index].type);
 819                 if (type != 0 && type <= special) {
 820                     uint32_t offset = Swap(super->index[index].offset);
 821                     struct Blob *local = (struct Blob *) (blob + offset);
 822                     sha1((uint8_t *) (hashes - type), (uint8_t *) local, Swap(local->length));
 823                 }
 824             }
 825
 826             super->count = Swap(count);
 827             super->blob.length = Swap(offset);
 828
 829             if (offset > size) {
 830                 fprintf(stderr, "offset (%u) > size (%u)\n", offset, size);
 831                 _assert(false);
 832             } //else fprintf(stderr, "offset (%zu) <= size (%zu)\n", offset, size);
 833
 834             memset(blob + offset, 0, size - offset);
 835         }
 836
 837         if (flag_S) {
 838             uint8_t *top = reinterpret_cast<uint8_t *>(framework.GetBase());
 839             size_t size = framework.GetSize();
 840
 841             char *copy;
 842             asprintf(&copy, "%s.%s.cp", dir, base);
 843             FILE *file = fopen(copy, "w+");
 844             size_t writ = fwrite(top, 1, size, file);
 845             _assert(writ == size);
 846             fclose(file);
 847
 848             _syscall(unlink(temp));
 849             free(temp);
 850             temp = copy;
 851         }
 852
 853         if (temp) {
 854             struct stat info;
 855             _syscall(stat(path, &info));
 856             _syscall(chown(temp, info.st_uid, info.st_gid));
 857             _syscall(chmod(temp, info.st_mode));
 858             _syscall(unlink(path));
 859             _syscall(rename(temp, path));
 860             free(temp);
 861         }
 862
 863         free(dir);
 864         ++filei;
 865     } catch (const char *) {
 866         ++filee;
 867         ++filei;
 868     }
 869
 870     return filee;
 871 }