mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-12-04 23:45:23 +00:00
403 lines
9.6 KiB
C++
403 lines
9.6 KiB
C++
/* file.cpp - Contains all files related utilities
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*/
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <libgen.h>
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#include <sys/sendfile.h>
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#include <sys/mman.h>
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#include <linux/fs.h>
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#include <magisk.h>
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#include <utils.h>
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#include <selinux.h>
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using namespace std;
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ssize_t fd_path(int fd, char *path, size_t size) {
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snprintf(path, size, "/proc/self/fd/%d", fd);
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return xreadlink(path, path, size);
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}
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int fd_pathat(int dirfd, const char *name, char *path, size_t size) {
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ssize_t len = fd_path(dirfd, path, size);
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if (len < 0)
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return -1;
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path[len] = '/';
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strlcpy(&path[len + 1], name, size - len - 1);
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return 0;
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}
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int mkdirs(const char *pathname, mode_t mode) {
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char *path = strdup(pathname), *p;
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errno = 0;
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for (p = path + 1; *p; ++p) {
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if (*p == '/') {
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*p = '\0';
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if (mkdir(path, mode) == -1) {
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if (errno != EEXIST)
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return -1;
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}
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*p = '/';
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}
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}
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if (mkdir(path, mode) == -1) {
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if (errno != EEXIST)
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return -1;
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}
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free(path);
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return 0;
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}
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static bool is_excl(initializer_list<const char *> excl, const char *name) {
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for (auto item : excl)
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if (strcmp(item, name) == 0)
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return true;
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return false;
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}
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static void post_order_walk(int dirfd, initializer_list<const char *> excl,
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int (*fn)(int, struct dirent *)) {
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struct dirent *entry;
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int newfd;
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DIR *dir = fdopendir(dirfd);
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if (dir == nullptr) return;
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while ((entry = xreaddir(dir))) {
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if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0)
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continue;
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if (is_excl(excl, entry->d_name))
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continue;
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if (entry->d_type == DT_DIR) {
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newfd = xopenat(dirfd, entry->d_name, O_RDONLY | O_CLOEXEC);
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post_order_walk(newfd, excl, fn);
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close(newfd);
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}
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fn(dirfd, entry);
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}
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}
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static int remove_at(int dirfd, struct dirent *entry) {
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return unlinkat(dirfd, entry->d_name, entry->d_type == DT_DIR ? AT_REMOVEDIR : 0);
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}
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void rm_rf(const char *path) {
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struct stat st;
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if (lstat(path, &st) < 0)
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return;
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if (S_ISDIR(st.st_mode)) {
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int fd = open(path, O_RDONLY | O_CLOEXEC);
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frm_rf(fd);
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close(fd);
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}
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remove(path);
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}
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void frm_rf(int dirfd, initializer_list<const char *> excl) {
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post_order_walk(dirfd, excl, remove_at);
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}
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/* This will only on the same file system */
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void mv_f(const char *source, const char *destination) {
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struct stat st;
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xlstat(source, &st);
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int src, dest;
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struct file_attr a;
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if (S_ISDIR(st.st_mode)) {
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xmkdirs(destination, st.st_mode & 0777);
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src = xopen(source, O_RDONLY | O_CLOEXEC);
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dest = xopen(destination, O_RDONLY | O_CLOEXEC);
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fclone_attr(src, dest);
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mv_dir(src, dest);
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close(src);
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close(dest);
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} else{
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getattr(source, &a);
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xrename(source, destination);
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setattr(destination, &a);
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}
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rmdir(source);
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}
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/* This will only on the same file system */
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void mv_dir(int src, int dest) {
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struct dirent *entry;
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DIR *dir;
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int newsrc, newdest;
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struct file_attr a;
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dir = xfdopendir(src);
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while ((entry = xreaddir(dir))) {
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if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0)
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continue;
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getattrat(src, entry->d_name, &a);
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switch (entry->d_type) {
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case DT_DIR:
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xmkdirat(dest, entry->d_name, a.st.st_mode & 0777);
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newsrc = xopenat(src, entry->d_name, O_RDONLY | O_CLOEXEC);
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newdest = xopenat(dest, entry->d_name, O_RDONLY | O_CLOEXEC);
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fsetattr(newdest, &a);
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mv_dir(newsrc, newdest);
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close(newsrc);
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close(newdest);
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unlinkat(src, entry->d_name, AT_REMOVEDIR);
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break;
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case DT_LNK:
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case DT_REG:
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renameat(src, entry->d_name, dest, entry->d_name);
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setattrat(dest, entry->d_name, &a);
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break;
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}
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}
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}
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void cp_afc(const char *source, const char *destination) {
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int src, dest;
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struct file_attr a;
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getattr(source, &a);
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if (S_ISDIR(a.st.st_mode)) {
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xmkdirs(destination, a.st.st_mode & 0777);
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src = xopen(source, O_RDONLY | O_CLOEXEC);
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dest = xopen(destination, O_RDONLY | O_CLOEXEC);
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clone_dir(src, dest);
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close(src);
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close(dest);
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} else{
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unlink(destination);
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if (S_ISREG(a.st.st_mode)) {
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src = xopen(source, O_RDONLY);
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dest = xopen(destination, O_WRONLY | O_CREAT | O_TRUNC);
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xsendfile(dest, src, nullptr, a.st.st_size);
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close(src);
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close(dest);
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} else if (S_ISLNK(a.st.st_mode)) {
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char buf[PATH_MAX];
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xreadlink(source, buf, sizeof(buf));
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xsymlink(buf, destination);
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}
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}
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setattr(destination, &a);
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}
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void clone_dir(int src, int dest, bool overwrite) {
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struct dirent *entry;
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DIR *dir;
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int srcfd, destfd, newsrc, newdest;
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char buf[PATH_MAX];
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struct file_attr a;
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dir = xfdopendir(src);
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while ((entry = xreaddir(dir))) {
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if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0)
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continue;
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if (struct stat st; !overwrite &&
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fstatat(dest, entry->d_name, &st, AT_SYMLINK_NOFOLLOW) == 0)
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continue;
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getattrat(src, entry->d_name, &a);
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switch (entry->d_type) {
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case DT_DIR:
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xmkdirat(dest, entry->d_name, a.st.st_mode & 0777);
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setattrat(dest, entry->d_name, &a);
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newsrc = xopenat(src, entry->d_name, O_RDONLY | O_CLOEXEC);
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newdest = xopenat(dest, entry->d_name, O_RDONLY | O_CLOEXEC);
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clone_dir(newsrc, newdest, overwrite);
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close(newsrc);
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close(newdest);
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break;
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case DT_REG:
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destfd = xopenat(dest, entry->d_name, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC);
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srcfd = xopenat(src, entry->d_name, O_RDONLY | O_CLOEXEC);
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xsendfile(destfd, srcfd, nullptr, a.st.st_size);
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fsetattr(destfd, &a);
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close(destfd);
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close(srcfd);
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break;
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case DT_LNK:
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xreadlinkat(src, entry->d_name, buf, sizeof(buf));
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xsymlinkat(buf, dest, entry->d_name);
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setattrat(dest, entry->d_name, &a);
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break;
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}
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}
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}
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void link_dir(int src, int dest) {
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struct dirent *entry;
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DIR *dir;
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int newsrc, newdest;
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struct file_attr a;
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dir = xfdopendir(src);
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while ((entry = xreaddir(dir))) {
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if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0)
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continue;
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if (entry->d_type == DT_DIR) {
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getattrat(src, entry->d_name, &a);
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xmkdirat(dest, entry->d_name, a.st.st_mode & 0777);
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setattrat(dest, entry->d_name, &a);
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newsrc = xopenat(src, entry->d_name, O_RDONLY | O_CLOEXEC);
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newdest = xopenat(dest, entry->d_name, O_RDONLY | O_CLOEXEC);
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link_dir(newsrc, newdest);
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close(newsrc);
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close(newdest);
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} else {
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xlinkat(src, entry->d_name, dest, entry->d_name, 0);
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}
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}
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}
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int getattr(const char *path, struct file_attr *a) {
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if (xlstat(path, &a->st) == -1)
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return -1;
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char *con;
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if (lgetfilecon(path, &con) == -1)
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return -1;
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strcpy(a->con, con);
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freecon(con);
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return 0;
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}
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int getattrat(int dirfd, const char *name, struct file_attr *a) {
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char path[4096];
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fd_pathat(dirfd, name, path, sizeof(path));
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return getattr(path, a);
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}
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int fgetattr(int fd, struct file_attr *a) {
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if (xfstat(fd, &a->st) < 0)
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return -1;
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char *con;
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if (fgetfilecon(fd, &con) < 0)
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return -1;
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strcpy(a->con, con);
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freecon(con);
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return 0;
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}
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int setattr(const char *path, struct file_attr *a) {
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if (chmod(path, a->st.st_mode & 0777) < 0)
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return -1;
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if (chown(path, a->st.st_uid, a->st.st_gid) < 0)
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return -1;
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if (a->con[0] && lsetfilecon(path, a->con) < 0)
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return -1;
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return 0;
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}
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int setattrat(int dirfd, const char *name, struct file_attr *a) {
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char path[4096];
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fd_pathat(dirfd, name, path, sizeof(path));
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return setattr(path, a);
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}
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int fsetattr(int fd, struct file_attr *a) {
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if (fchmod(fd, a->st.st_mode & 0777) < 0)
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return -1;
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if (fchown(fd, a->st.st_uid, a->st.st_gid) < 0)
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return -1;
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if (a->con[0] && fsetfilecon(fd, a->con) < 0)
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return -1;
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return 0;
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}
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void clone_attr(const char *source, const char *target) {
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struct file_attr a;
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getattr(source, &a);
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setattr(target, &a);
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}
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void fclone_attr(int sourcefd, int targetfd) {
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struct file_attr a;
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fgetattr(sourcefd, &a);
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fsetattr(targetfd, &a);
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}
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void *__mmap(const char *filename, size_t *size, bool rw) {
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struct stat st;
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void *buf;
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int fd = xopen(filename, (rw ? O_RDWR : O_RDONLY) | O_CLOEXEC);
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fstat(fd, &st);
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if (S_ISBLK(st.st_mode))
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ioctl(fd, BLKGETSIZE64, size);
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else
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*size = st.st_size;
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buf = *size > 0 ? xmmap(nullptr, *size, PROT_READ | (rw ? PROT_WRITE : 0), MAP_SHARED, fd, 0) : nullptr;
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close(fd);
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return buf;
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}
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void mmap_ro(const char *filename, void **buf, size_t *size) {
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*buf = __mmap(filename, size, false);
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}
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void fd_full_read(int fd, void **buf, size_t *size) {
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*size = lseek(fd, 0, SEEK_END);
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lseek(fd, 0, SEEK_SET);
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*buf = xmalloc(*size + 1);
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xxread(fd, *buf, *size);
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((char *) *buf)[*size] = '\0';
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}
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void full_read(const char *filename, void **buf, size_t *size) {
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int fd = xopen(filename, O_RDONLY | O_CLOEXEC);
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if (fd < 0) {
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*buf = nullptr;
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*size = 0;
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return;
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}
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fd_full_read(fd, buf, size);
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close(fd);
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}
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void write_zero(int fd, size_t size) {
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char buf[4096] = {0};
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size_t len;
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while (size > 0) {
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len = sizeof(buf) > size ? size : sizeof(buf);
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write(fd, buf, len);
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size -= len;
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}
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}
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void file_readline(const char *file, const function<bool (string_view)> &fn, bool trim) {
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FILE *fp = xfopen(file, "re");
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if (fp == nullptr)
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return;
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size_t len = 1024;
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char *buf = (char *) malloc(len);
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char *start;
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ssize_t read;
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while ((read = getline(&buf, &len, fp)) >= 0) {
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start = buf;
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if (trim) {
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while (read && (buf[read - 1] == '\n' || buf[read - 1] == ' '))
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--read;
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buf[read] = '\0';
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while (*start == ' ')
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++start;
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}
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if (!fn(start))
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break;
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}
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fclose(fp);
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free(buf);
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}
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void parse_prop_file(const char *file, const function<bool (string_view, string_view)> &fn) {
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file_readline(file, [&](string_view line_view) -> bool {
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char *line = (char *) line_view.data();
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if (line[0] == '#')
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return true;
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char *eql = strchr(line, '=');
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if (eql == nullptr || eql == line)
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return true;
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*eql = '\0';
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return fn(line, eql + 1);
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}, true);
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}
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