92 lines
3.3 KiB
C
92 lines
3.3 KiB
C
#define _GNU_SOURCE
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <dlfcn.h>
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#include <fcntl.h>
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#include <stdint.h>
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#include <spawn.h>
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static int is_x86_64_elf(const char *path) {
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if (!path) return 0;
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int fd = open(path, O_RDONLY);
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if (fd < 0) return 0;
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unsigned char header[20];
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ssize_t n = read(fd, header, sizeof(header));
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close(fd);
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if (n < 20) return 0;
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if (header[0] != 0x7f || header[1] != 'E' || header[2] != 'L' || header[3] != 'F') return 0;
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if (header[4] != 2 || header[5] != 1) return 0;
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uint16_t machine = (uint16_t)(header[18] | (header[19] << 8));
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return machine == 62;
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}
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static char **build_qemu_argv(const char *pathname, char *const argv[]) {
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int argc = 0;
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while (argv && argv[argc]) argc++;
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char **new_argv = (char **)malloc((argc + 4) * sizeof(char *));
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if (!new_argv) return NULL;
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new_argv[0] = /usr/bin/qemu-x86_64-static;
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new_argv[1] = -L;
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new_argv[2] = /usr/x86_64-linux-gnu;
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new_argv[3] = (char *)pathname;
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for (int i = 1; i < argc; i++) {
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new_argv[i + 3] = argv[i];
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}
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new_argv[argc + 3] = NULL;
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return new_argv;
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}
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int execve(const char *pathname, char *const argv[], char *const envp[]) {
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static int (*real_execve)(const char *, char *const [], char *const []) = NULL;
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if (!real_execve) real_execve = (int (*)(const char *, char *const [], char *const []))dlsym(RTLD_NEXT, execve);
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if (pathname && is_x86_64_elf(pathname)) {
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char **new_argv = build_qemu_argv(pathname, argv);
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if (new_argv) {
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return real_execve(/usr/bin/qemu-x86_64-static, new_argv, envp);
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}
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}
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return real_execve(pathname, argv, envp);
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}
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int execv(const char *pathname, char *const argv[]) {
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extern char **environ;
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return execve(pathname, argv, environ);
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}
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int execvp(const char *file, char *const argv[]) {
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extern char **environ;
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return execve(file, argv, environ);
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}
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int execvpe(const char *file, char *const argv[], char *const envp[]) {
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return execve(file, argv, envp);
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}
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int posix_spawn(pid_t *pid, const char *path,
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const posix_spawn_file_actions_t *file_actions,
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const posix_spawnattr_t *attrp,
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char *const argv[], char *const envp[]) {
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static int (*real_posix_spawn)(pid_t *, const char *, const posix_spawn_file_actions_t *,
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const posix_spawnattr_t *, char *const [], char *const []) = NULL;
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if (!real_posix_spawn) {
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real_posix_spawn = (int (*)(pid_t *, const char *, const posix_spawn_file_actions_t *,
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const posix_spawnattr_t *, char *const [], char *const []))dlsym(RTLD_NEXT, posix_spawn);
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}
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if (path && is_x86_64_elf(path)) {
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char **new_argv = build_qemu_argv(path, argv);
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if (new_argv) {
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return real_posix_spawn(pid, /usr/bin/qemu-x86_64-static, file_actions, attrp, new_argv, envp);
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}
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}
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return real_posix_spawn(pid, path, file_actions, attrp, argv, envp);
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}
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int posix_spawnp(pid_t *pid, const char *file,
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const posix_spawn_file_actions_t *file_actions,
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const posix_spawnattr_t *attrp,
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char *const argv[], char *const envp[]) {
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return posix_spawn(pid, file, file_actions, attrp, argv, envp);
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}
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