Drastic, sweeping modifications to support iPhone 1.2.0/2.0.

1 files changed, 297 insertions, 0 deletions

diff --git a/ldid.cpp b/ldid.cpp
new file mode 100644
index 0000000..b1c114a
--- /dev/null
+++ b/ldid.cpp
@@ -0,0 +1,297 @@
+/* JocStrap - Java/Objective-C Bootstrap
+ * Copyright (C) 2007  Jay Freeman (saurik)
+*/
+
+/*
+ *        Redistribution and use in source and binary
+ * forms, with or without modification, are permitted
+ * provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the
+ *    above copyright notice, this list of conditions
+ *    and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the
+ *    above copyright notice, this list of conditions
+ *    and the following disclaimer in the documentation
+ *    and/or other materials provided with the
+ *    distribution.
+ * 3. The name of the author may not be used to endorse
+ *    or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#include "minimal/stdlib.h"
+#include "minimal/mapping.h"
+
+#include <cstring>
+#include <string>
+#include <vector>
+
+struct fat_header {
+    uint32_t magic;
+    uint32_t nfat_arch;
+};
+
+#define FAT_MAGIC 0xcafebabe
+#define FAT_CIGAM 0xbebafeca
+
+struct fat_arch {
+    uint32_t cputype;
+    uint32_t cpusubtype;
+    uint32_t offset;
+    uint32_t size;
+    uint32_t align;
+};
+
+struct mach_header {
+    uint32_t magic;
+    uint32_t cputype;
+    uint32_t cpusubtype;
+    uint32_t filetype;
+    uint32_t ncmds;
+    uint32_t sizeofcmds;
+    uint32_t flags;
+};
+
+#define	MH_MAGIC 0xfeedface
+#define MH_CIGAM 0xcefaedfe
+
+#define	MH_EXECUTE 0x2
+#define	MH_DYLIB   0x6
+#define	MH_BUNDLE  0x8
+
+struct load_command {
+    uint32_t cmd;
+    uint32_t cmdsize;
+};
+
+#define LC_REQ_DYLD  0x80000000
+
+#define	LC_LOAD_DYLIB	   0x0c
+#define	LC_ID_DYLIB	   0x0d
+#define LC_UUID		   0x1b
+#define LC_REEXPORT_DYLIB (0x1f | LC_REQ_DYLD)
+
+struct dylib {
+    uint32_t name;
+    uint32_t timestamp;
+    uint32_t current_version;
+    uint32_t compatibility_version;
+};
+
+struct dylib_command {
+    uint32_t cmd;
+    uint32_t cmdsize;
+    struct dylib dylib;
+};
+
+struct uuid_command {
+    uint32_t cmd;
+    uint32_t cmdsize;
+    uint8_t uuid[16];
+};
+
+class Framework {
+  private:
+    void *base_;
+    size_t size_;
+    mach_header *mach_header_;
+    bool swapped_;
+
+  public:
+    int16_t Swap(int16_t value) const {
+        return Swap(static_cast<uint16_t>(value));
+    }
+
+    int32_t Swap(int32_t value) const {
+        return Swap(static_cast<uint32_t>(value));
+    }
+
+    uint16_t Swap(uint16_t value) const {
+        return !swapped_ ? value :
+            ((value >>  8) & 0x00ff) |
+            ((value <<  8) & 0xff00);
+    }
+
+    uint32_t Swap(uint32_t value) const {
+        if (!swapped_)
+            return value;
+        else {
+            value = ((value >>  8) & 0x00ff00ff) |
+                    ((value <<  8) & 0xff00ff00);
+            value = ((value >> 16) & 0x0000ffff) |
+                    ((value << 16) & 0xffff0000);
+            return value;
+        }
+    }
+
+    Framework(const char *framework_path) :
+        swapped_(false)
+    {
+        base_ = map(framework_path, 0, _not(size_t), &size_, false);
+        fat_header *fat_header = reinterpret_cast<struct fat_header *>(base_);
+
+        if (Swap(fat_header->magic) == FAT_CIGAM) {
+            swapped_ = !swapped_;
+            goto fat;
+        } else if (Swap(fat_header->magic) != FAT_MAGIC)
+            mach_header_ = (mach_header *) base_;
+        else fat: {
+            size_t fat_narch = Swap(fat_header->nfat_arch);
+            fat_arch *fat_arch = reinterpret_cast<struct fat_arch *>(fat_header + 1);
+            size_t arch;
+            for (arch = 0; arch != fat_narch; ++arch) {
+                uint32_t arch_offset = Swap(fat_arch->offset);
+                mach_header_ = (mach_header *) ((uint8_t *) base_ + arch_offset);
+                goto found;
+                ++fat_arch;
+            }
+
+            _assert(false);
+        }
+
+      found:
+        if (Swap(mach_header_->magic) == MH_CIGAM)
+            swapped_ = !swapped_;
+        else _assert(Swap(mach_header_->magic) == MH_MAGIC);
+
+        _assert(
+            Swap(mach_header_->filetype) == MH_EXECUTE ||
+            Swap(mach_header_->filetype) == MH_DYLIB ||
+            Swap(mach_header_->filetype) == MH_BUNDLE
+        );
+    }
+
+    void *GetBase() {
+        return base_;
+    }
+
+    size_t GetSize() {
+        return size_;
+    }
+
+    std::vector<struct load_command *> GetLoadCommands() {
+        std::vector<struct load_command *> load_commands;
+
+        struct load_command *load_command = reinterpret_cast<struct load_command *>(mach_header_ + 1);
+        for (uint32_t cmd = 0; cmd != Swap(mach_header_->ncmds); ++cmd) {
+            load_commands.push_back(load_command);
+            load_command = (struct load_command *) ((uint8_t *) load_command + Swap(load_command->cmdsize));
+        }
+
+        return load_commands;
+    }
+};
+
+extern "C" uint32_t hash(uint8_t *k, uint32_t length, uint32_t initval);
+
+int main(int argc, const char *argv[]) {
+    bool flag_R(false);
+    bool flag_t(false);
+    bool flag_p(false);
+    bool flag_u(false);
+
+    bool flag_T(false);
+
+    bool timeh(false);
+    uint32_t timev(0);
+
+    std::vector<std::string> files;
+
+    _assert(argc != 0);
+    for (int argi(1); argi != argc; ++argi)
+        if (argv[argi][0] != '-')
+            files.push_back(argv[argi]);
+        else switch (argv[argi][1]) {
+            case 'R': flag_R = true; break;
+            case 't': flag_t = true; break;
+            case 'u': flag_u = true; break;
+            case 'p': flag_p = true; break;
+
+            case 'T': {
+                flag_T = true;
+                if (argv[argi][2] == '-')
+                    timeh = true;
+                else {
+                    char *arge;
+                    timev = strtoul(argv[argi] + 2, &arge, 0);
+                    _assert(arge == argv[argi] + strlen(argv[argi]));
+                }
+            } break;
+
+            default:
+                goto usage;
+            break;
+        }
+
+    if (files.empty()) usage: {
+        exit(0);
+    }
+
+    size_t filei(0), filee(0);
+    _foreach (file, files) try {
+        Framework framework(file->c_str());
+
+        if (flag_p)
+            printf("path%zu='%s'\n", filei, file->c_str());
+
+        _foreach (load_command, framework.GetLoadCommands()) {
+            uint32_t cmd(framework.Swap((*load_command)->cmd));
+
+            if (flag_R && cmd == LC_REEXPORT_DYLIB)
+                (*load_command)->cmd = framework.Swap(LC_LOAD_DYLIB);
+            else if (cmd == LC_UUID) {
+                volatile struct uuid_command *uuid_command(reinterpret_cast<struct uuid_command *>(*load_command));
+
+                if (flag_u) {
+                    printf("uuid%zu=%.2x%.2x%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x%.2x%.2x%.2x%.2x\n", filei,
+                        uuid_command->uuid[ 0], uuid_command->uuid[ 1], uuid_command->uuid[ 2], uuid_command->uuid[ 3],
+                        uuid_command->uuid[ 4], uuid_command->uuid[ 5], uuid_command->uuid[ 6], uuid_command->uuid[ 7],
+                        uuid_command->uuid[ 8], uuid_command->uuid[ 9], uuid_command->uuid[10], uuid_command->uuid[11],
+                        uuid_command->uuid[12], uuid_command->uuid[13], uuid_command->uuid[14], uuid_command->uuid[15]
+                    );
+                }
+            } else if (cmd == LC_ID_DYLIB) {
+                volatile struct dylib_command *dylib_command(reinterpret_cast<struct dylib_command *>(*load_command));
+
+                if (flag_t)
+                    printf("time%zu=0x%.8x\n", filei, framework.Swap(dylib_command->dylib.timestamp));
+
+                if (flag_T) {
+                    uint32_t timed;
+
+                    if (!timeh)
+                        timed = timev;
+                    else {
+                        dylib_command->dylib.timestamp = 0;
+                        timed = hash(reinterpret_cast<uint8_t *>(framework.GetBase()), framework.GetSize(), timev);
+                    }
+
+                    dylib_command->dylib.timestamp = framework.Swap(timed);
+                }
+            }
+        }
+
+        ++filei;
+    } catch (const char *) {
+        ++filee;
+        ++filei;
+    }
+
+    return filee;
+}