initial commit taken from gitlab.lrz.de

node_modules/react-native/Libraries/fishhook/LICENSE

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+// Copyright (c) 2013, Facebook, Inc.
+// All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//   * Redistributions of source code must retain the above copyright notice,
+//     this list of conditions and the following disclaimer.
+//   * 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.
+//   * Neither the name Facebook nor the names of its contributors may be used to
+//     endorse or promote products derived from this software without specific
+//     prior written permission.
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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.

node_modules/react-native/Libraries/fishhook/README.md

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+# fishhook
+
+__fishhook__ is a very simple library that enables dynamically rebinding symbols in Mach-O binaries running on iOS in the simulator and on device. This provides functionality that is similar to using [`DYLD_INTERPOSE`][interpose] on OS X. At Facebook, we've found it useful as a way to hook calls in libSystem for debugging/tracing purposes (for example, auditing for double-close issues with file descriptors).
+
+[interpose]: http://opensource.apple.com/source/dyld/dyld-210.2.3/include/mach-o/dyld-interposing.h "<mach-o/dyld-interposing.h>"
+
+## Usage
+
+Once you add `fishhook.h`/`fishhook.c` to your project, you can rebind symbols as follows:
+```Objective-C
+#import <dlfcn.h>
+
+#import <UIKit/UIKit.h>
+
+#import "AppDelegate.h"
+#import "fishhook.h"
+ 
+static int (*orig_close)(int);
+static int (*orig_open)(const char *, int, ...);
+ 
+int my_close(int fd) {
+  printf("Calling real close(%d)\n", fd);
+  return orig_close(fd);
+}
+ 
+int my_open(const char *path, int oflag, ...) {
+  va_list ap = {0};
+  mode_t mode = 0;
+ 
+  if ((oflag & O_CREAT) != 0) {
+    // mode only applies to O_CREAT
+    va_start(ap, oflag);
+    mode = va_arg(ap, int);
+    va_end(ap);
+    printf("Calling real open('%s', %d, %d)\n", path, oflag, mode);
+    return orig_open(path, oflag, mode);
+  } else {
+    printf("Calling real open('%s', %d)\n", path, oflag);
+    return orig_open(path, oflag, mode);
+  }
+}
+ 
+int main(int argc, char * argv[])
+{
+  @autoreleasepool {
+    rebind_symbols((struct rebinding[2]){{"close", my_close, (void *)&orig_close}, {"open", my_open, (void *)&orig_open}}, 2);
+ 
+    // Open our own binary and print out first 4 bytes (which is the same
+    // for all Mach-O binaries on a given architecture)
+    int fd = open(argv[0], O_RDONLY);
+    uint32_t magic_number = 0;
+    read(fd, &magic_number, 4);
+    printf("Mach-O Magic Number: %x \n", magic_number);
+    close(fd);
+ 
+    return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
+  }
+}
+```
+### Sample output
+```
+Calling real open('/var/mobile/Applications/161DA598-5B83-41F5-8A44-675491AF6A2C/Test.app/Test', 0)
+Mach-O Magic Number: feedface 
+Calling real close(3)
+...
+```
+
+## How it works
+
+`dyld` binds lazy and non-lazy symbols by updating pointers in particular sections of the `__DATA` segment of a Mach-O binary. __fishhook__ re-binds these symbols by determining the locations to update for each of the symbol names passed to `rebind_symbols` and then writing out the corresponding replacements.
+
+For a given image, the `__DATA` segment may contain two sections that are relevant for dynamic symbol bindings: `__nl_symbol_ptr` and `__la_symbol_ptr`. `__nl_symbol_ptr` is an array of pointers to non-lazily bound data (these are bound at the time a library is loaded) and `__la_symbol_ptr` is an array of pointers to imported functions that is generally filled by a routine called `dyld_stub_binder` during the first call to that symbol (it's also possible to tell `dyld` to bind these at launch). In order to find the name of the symbol that corresponds to a particular location in one of these sections, we have to jump through several layers of indirection. For the two relevant sections, the section headers (`struct section`s from `<mach-o/loader.h>`) provide an offset (in the `reserved1` field) into what is known as the indirect symbol table. The indirect symbol table, which is located in the `__LINKEDIT` segment of the binary, is just an array of indexes into the symbol table (also in `__LINKEDIT`) whose order is identical to that of the pointers in the non-lazy and lazy symbol sections. So, given `struct section nl_symbol_ptr`, the corresponding index in the symbol table of the first address in that section is `indirect_symbol_table[nl_symbol_ptr->reserved1]`. The symbol table itself is an array of `struct nlist`s (see `<mach-o/nlist.h>`), and each `nlist` contains an index into the string table in `__LINKEDIT` which where the actual symbol names are stored. So, for each pointer `__nl_symbol_ptr` and `__la_symbol_ptr`, we are able to find the corresponding symbol and then the corresponding string to compare against the requested symbol names, and if there is a match, we replace the pointer in the section with the replacement.
+
+The process of looking up the name of a given entry in the lazy or non-lazy pointer tables looks like this:
+![Visual explanation](http://i.imgur.com/HVXqHCz.png)

node_modules/react-native/Libraries/fishhook/fishhook.c

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+// Copyright (c) 2013, Facebook, Inc.
+// All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//   * Redistributions of source code must retain the above copyright notice,
+//     this list of conditions and the following disclaimer.
+//   * 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.
+//   * Neither the name Facebook nor the names of its contributors may be used to
+//     endorse or promote products derived from this software without specific
+//     prior written permission.
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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.
+
+#import "fishhook.h"
+
+#import <dlfcn.h>
+#import <stdlib.h>
+#import <string.h>
+#import <sys/types.h>
+#import <mach-o/dyld.h>
+#import <mach-o/loader.h>
+#import <mach-o/nlist.h>
+
+#ifdef __LP64__
+typedef struct mach_header_64 mach_header_t;
+typedef struct segment_command_64 segment_command_t;
+typedef struct section_64 section_t;
+typedef struct nlist_64 nlist_t;
+#define LC_SEGMENT_ARCH_DEPENDENT LC_SEGMENT_64
+#else
+typedef struct mach_header mach_header_t;
+typedef struct segment_command segment_command_t;
+typedef struct section section_t;
+typedef struct nlist nlist_t;
+#define LC_SEGMENT_ARCH_DEPENDENT LC_SEGMENT
+#endif
+
+#ifndef SEG_DATA_CONST
+#define SEG_DATA_CONST  "__DATA_CONST"
+#endif
+
+struct rebindings_entry {
+  struct rebinding *rebindings;
+  size_t rebindings_nel;
+  struct rebindings_entry *next;
+};
+
+static struct rebindings_entry *_rebindings_head;
+
+static int prepend_rebindings(struct rebindings_entry **rebindings_head,
+                              struct rebinding rebindings[],
+                              size_t nel) {
+  struct rebindings_entry *new_entry = (struct rebindings_entry *) malloc(sizeof(struct rebindings_entry));
+  if (!new_entry) {
+    return -1;
+  }
+  new_entry->rebindings = (struct rebinding *) malloc(sizeof(struct rebinding) * nel);
+  if (!new_entry->rebindings) {
+    free(new_entry);
+    return -1;
+  }
+  memcpy(new_entry->rebindings, rebindings, sizeof(struct rebinding) * nel);
+  new_entry->rebindings_nel = nel;
+  new_entry->next = *rebindings_head;
+  *rebindings_head = new_entry;
+  return 0;
+}
+
+static void perform_rebinding_with_section(struct rebindings_entry *rebindings,
+                                           section_t *section,
+                                           intptr_t slide,
+                                           nlist_t *symtab,
+                                           char *strtab,
+                                           uint32_t *indirect_symtab) {
+  uint32_t *indirect_symbol_indices = indirect_symtab + section->reserved1;
+  void **indirect_symbol_bindings = (void **)((uintptr_t)slide + section->addr);
+  for (uint i = 0; i < section->size / sizeof(void *); i++) {
+    uint32_t symtab_index = indirect_symbol_indices[i];
+    if (symtab_index == INDIRECT_SYMBOL_ABS || symtab_index == INDIRECT_SYMBOL_LOCAL ||
+        symtab_index == (INDIRECT_SYMBOL_LOCAL   | INDIRECT_SYMBOL_ABS)) {
+      continue;
+    }
+    uint32_t strtab_offset = symtab[symtab_index].n_un.n_strx;
+    char *symbol_name = strtab + strtab_offset;
+    if (strnlen(symbol_name, 2) < 2) {
+      continue;
+    }
+    struct rebindings_entry *cur = rebindings;
+    while (cur) {
+      for (uint j = 0; j < cur->rebindings_nel; j++) {
+        if (strcmp(&symbol_name[1], cur->rebindings[j].name) == 0) {
+          if (cur->rebindings[j].replaced != NULL &&
+              indirect_symbol_bindings[i] != cur->rebindings[j].replacement) {
+            *(cur->rebindings[j].replaced) = indirect_symbol_bindings[i];
+          }
+          indirect_symbol_bindings[i] = cur->rebindings[j].replacement;
+          goto symbol_loop;
+        }
+      }
+      cur = cur->next;
+    }
+  symbol_loop:;
+  }
+}
+
+static void rebind_symbols_for_image(struct rebindings_entry *rebindings,
+                                     const struct mach_header *header,
+                                     intptr_t slide) {
+  Dl_info info;
+  if (dladdr(header, &info) == 0) {
+    return;
+  }
+
+  segment_command_t *cur_seg_cmd;
+  segment_command_t *linkedit_segment = NULL;
+  struct symtab_command* symtab_cmd = NULL;
+  struct dysymtab_command* dysymtab_cmd = NULL;
+
+  uintptr_t cur = (uintptr_t)header + sizeof(mach_header_t);
+  for (uint i = 0; i < header->ncmds; i++, cur += cur_seg_cmd->cmdsize) {
+    cur_seg_cmd = (segment_command_t *)cur;
+    if (cur_seg_cmd->cmd == LC_SEGMENT_ARCH_DEPENDENT) {
+      if (strcmp(cur_seg_cmd->segname, SEG_LINKEDIT) == 0) {
+        linkedit_segment = cur_seg_cmd;
+      }
+    } else if (cur_seg_cmd->cmd == LC_SYMTAB) {
+      symtab_cmd = (struct symtab_command*)cur_seg_cmd;
+    } else if (cur_seg_cmd->cmd == LC_DYSYMTAB) {
+      dysymtab_cmd = (struct dysymtab_command*)cur_seg_cmd;
+    }
+  }
+
+  if (!symtab_cmd || !dysymtab_cmd || !linkedit_segment ||
+      !dysymtab_cmd->nindirectsyms) {
+    return;
+  }
+
+  // Find base symbol/string table addresses
+  uintptr_t linkedit_base = (uintptr_t)slide + linkedit_segment->vmaddr - linkedit_segment->fileoff;
+  nlist_t *symtab = (nlist_t *)(linkedit_base + symtab_cmd->symoff);
+  char *strtab = (char *)(linkedit_base + symtab_cmd->stroff);
+
+  // Get indirect symbol table (array of uint32_t indices into symbol table)
+  uint32_t *indirect_symtab = (uint32_t *)(linkedit_base + dysymtab_cmd->indirectsymoff);
+
+  cur = (uintptr_t)header + sizeof(mach_header_t);
+  for (uint i = 0; i < header->ncmds; i++, cur += cur_seg_cmd->cmdsize) {
+    cur_seg_cmd = (segment_command_t *)cur;
+    if (cur_seg_cmd->cmd == LC_SEGMENT_ARCH_DEPENDENT) {
+      if (strcmp(cur_seg_cmd->segname, SEG_DATA) != 0 &&
+          strcmp(cur_seg_cmd->segname, SEG_DATA_CONST) != 0) {
+        continue;
+      }
+      for (uint j = 0; j < cur_seg_cmd->nsects; j++) {
+        section_t *sect =
+          (section_t *)(cur + sizeof(segment_command_t)) + j;
+        if ((sect->flags & SECTION_TYPE) == S_LAZY_SYMBOL_POINTERS) {
+          perform_rebinding_with_section(rebindings, sect, slide, symtab, strtab, indirect_symtab);
+        }
+        if ((sect->flags & SECTION_TYPE) == S_NON_LAZY_SYMBOL_POINTERS) {
+          perform_rebinding_with_section(rebindings, sect, slide, symtab, strtab, indirect_symtab);
+        }
+      }
+    }
+  }
+}
+
+static void _rebind_symbols_for_image(const struct mach_header *header,
+                                      intptr_t slide) {
+    rebind_symbols_for_image(_rebindings_head, header, slide);
+}
+
+int rebind_symbols_image(void *header,
+                         intptr_t slide,
+                         struct rebinding rebindings[],
+                         size_t rebindings_nel) {
+    struct rebindings_entry *rebindings_head = NULL;
+    int retval = prepend_rebindings(&rebindings_head, rebindings, rebindings_nel);
+    rebind_symbols_for_image(rebindings_head, (const struct mach_header *) header, slide);
+    free(rebindings_head);
+    return retval;
+}
+
+int rebind_symbols(struct rebinding rebindings[], size_t rebindings_nel) {
+  int retval = prepend_rebindings(&_rebindings_head, rebindings, rebindings_nel);
+  if (retval < 0) {
+    return retval;
+  }
+  // If this was the first call, register callback for image additions (which is also invoked for
+  // existing images, otherwise, just run on existing images
+  if (!_rebindings_head->next) {
+    _dyld_register_func_for_add_image(_rebind_symbols_for_image);
+  } else {
+    uint32_t c = _dyld_image_count();
+    for (uint32_t i = 0; i < c; i++) {
+      _rebind_symbols_for_image(_dyld_get_image_header(i), _dyld_get_image_vmaddr_slide(i));
+    }
+  }
+  return retval;
+}

node_modules/react-native/Libraries/fishhook/fishhook.h

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+// Copyright (c) 2013, Facebook, Inc.
+// All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//   * Redistributions of source code must retain the above copyright notice,
+//     this list of conditions and the following disclaimer.
+//   * 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.
+//   * Neither the name Facebook nor the names of its contributors may be used to
+//     endorse or promote products derived from this software without specific
+//     prior written permission.
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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.
+
+#ifndef fishhook_h
+#define fishhook_h
+
+#include <stddef.h>
+#include <stdint.h>
+
+#if !defined(FISHHOOK_EXPORT)
+#define FISHHOOK_VISIBILITY __attribute__((visibility("hidden")))
+#else
+#define FISHHOOK_VISIBILITY __attribute__((visibility("default")))
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif //__cplusplus
+
+/*
+ * A structure representing a particular intended rebinding from a symbol
+ * name to its replacement
+ */
+struct rebinding {
+  const char *name;
+  void *replacement;
+  void **replaced;
+};
+
+/*
+ * For each rebinding in rebindings, rebinds references to external, indirect
+ * symbols with the specified name to instead point at replacement for each
+ * image in the calling process as well as for all future images that are loaded
+ * by the process. If rebind_functions is called more than once, the symbols to
+ * rebind are added to the existing list of rebindings, and if a given symbol
+ * is rebound more than once, the later rebinding will take precedence.
+ */
+FISHHOOK_VISIBILITY
+int rebind_symbols(struct rebinding rebindings[], size_t rebindings_nel);
+
+/*
+ * Rebinds as above, but only in the specified image. The header should point
+ * to the mach-o header, the slide should be the slide offset. Others as above.
+ */
+FISHHOOK_VISIBILITY
+int rebind_symbols_image(void *header,
+                         intptr_t slide,
+                         struct rebinding rebindings[],
+                         size_t rebindings_nel);
+
+#ifdef __cplusplus
+}
+#endif //__cplusplus
+
+#endif //fishhook_h
+