92 lines
2.7 KiB
C++
92 lines
2.7 KiB
C++
#include <cstdlib>
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#include <sys/stat.h>
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#include <LIEF/ELF.hpp>
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#include <libreborn/libreborn.h>
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#include "patchelf.h"
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// Duplicate MCPI Executable Into /tmp
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static void duplicate_mcpi_executable(char *new_path) {
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// Ensure Temporary Directory
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{
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// Check If It Exists
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struct stat tmp_stat;
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int exists = stat(MCPI_PATCHED_DIR, &tmp_stat) != 0 ? 0 : S_ISDIR(tmp_stat.st_mode);
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if (!exists) {
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// Doesn't Exist
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if (mkdir(MCPI_PATCHED_DIR, S_IRUSR | S_IWUSR | S_IXUSR) != 0) {
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ERR("Unable To Create Temporary Folder: %s", strerror(errno));
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}
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}
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}
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// Generate New File
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int new_file_fd = mkstemp(new_path);
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if (new_file_fd == -1) {
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ERR("Unable To Create Temporary File: %s", strerror(errno));
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}
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close(new_file_fd);
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}
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// Fix MCPI Dependencies
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static const char *libraries_to_remove[] = {
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"libbcm_host.so",
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"libX11.so.6",
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"libEGL.so",
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"libGLESv2.so",
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"libSDL-1.2.so.0"
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};
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static const char *libraries_to_add[] = {
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"libmedia-layer-core.so"
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};
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void patch_mcpi_elf_dependencies(const char *original_path, char *new_path, const char *linker) {
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// Duplicate MCPI executable into /tmp so it can be modified.
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duplicate_mcpi_executable(new_path);
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// Patch File
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{
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std::unique_ptr<LIEF::ELF::Binary> binary = LIEF::ELF::Parser::parse(original_path);
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if (linker != NULL) {
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binary->interpreter(linker);
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}
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for (size_t i = 0; i < (sizeof (libraries_to_remove) / sizeof (const char *)); i++) {
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binary->remove_library(libraries_to_remove[i]);
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}
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for (size_t i = 0; i < (sizeof (libraries_to_add) / sizeof (const char *)); i++) {
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binary->add_library(libraries_to_add[i]);
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}
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LIEF::ELF::Builder builder{*binary};
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builder.build();
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builder.write(new_path);
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}
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// Fix Permissions
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if (chmod(new_path, S_IRUSR | S_IXUSR) != 0) {
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ERR("Unable To Set File Permissions: %s: %s", new_path, strerror(errno));
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}
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}
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// Get Interpreter
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static int dl_iterate_callback(struct dl_phdr_info *info, __attribute__((unused)) size_t size, void *data) {
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// Only Search Current Program
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if (strcmp(info->dlpi_name, "") == 0) {
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for (int i = 0; i < info->dlpi_phnum; i++) {
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if (info->dlpi_phdr[i].p_type == PT_INTERP) {
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// Callback
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*(char **) data = (char *) (info->dlpi_addr + info->dlpi_phdr[i].p_vaddr);
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}
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}
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}
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return 0;
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}
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char *patch_get_interpreter() {
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char *interpreter = NULL;
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dl_iterate_phdr(dl_iterate_callback, &interpreter);
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if (interpreter != NULL) {
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interpreter = strdup(interpreter);
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}
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return interpreter;
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}
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