2018-11-03 08:06:01 +01:00
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/* file.cpp - Contains all files related utilities
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2017-10-11 20:57:18 +02:00
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*/
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2019-06-23 12:53:41 +02:00
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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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2017-10-11 20:57:18 +02:00
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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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2017-11-15 14:00:52 +01:00
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#include <errno.h>
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#include <string.h>
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2017-11-27 08:37:28 +01:00
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#include <libgen.h>
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2017-10-14 15:10:22 +02:00
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2019-02-10 09:57:51 +01:00
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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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2017-10-11 20:57:18 +02:00
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2019-01-20 05:59:37 +01:00
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using namespace std;
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2019-03-14 11:34:22 +01:00
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ssize_t fd_path(int fd, char *path, size_t size) {
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2017-10-14 15:10:22 +02:00
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snprintf(path, size, "/proc/self/fd/%d", fd);
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2019-03-14 11:34:22 +01:00
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return xreadlink(path, path, size);
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2018-07-12 23:41:29 +02:00
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}
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2019-03-14 11:34:22 +01:00
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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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2018-09-27 06:09:59 +02:00
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return 0;
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2017-10-14 15:10:22 +02:00
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}
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2018-01-10 20:06:20 +01:00
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int mkdirs(const char *pathname, mode_t mode) {
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2017-10-11 20:57:18 +02:00
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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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2019-03-31 12:32:33 +02:00
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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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2017-10-11 20:57:18 +02:00
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struct dirent *entry;
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int newfd;
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2017-12-15 19:02:17 +01:00
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DIR *dir = fdopendir(dirfd);
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2018-11-03 08:06:01 +01:00
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if (dir == nullptr) return;
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2017-10-11 20:57:18 +02:00
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2017-10-13 18:08:12 +02:00
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while ((entry = xreaddir(dir))) {
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2017-10-11 20:57:18 +02:00
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if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0)
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continue;
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2019-03-31 12:32:33 +02:00
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if (is_excl(excl, entry->d_name))
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2017-10-11 20:57:18 +02:00
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continue;
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2017-12-06 20:21:13 +01:00
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if (entry->d_type == DT_DIR) {
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2017-10-13 18:08:12 +02:00
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newfd = xopenat(dirfd, entry->d_name, O_RDONLY | O_CLOEXEC);
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2019-03-31 12:32:33 +02:00
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post_order_walk(newfd, excl, fn);
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2017-10-11 20:57:18 +02:00
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close(newfd);
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}
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2019-02-14 06:52:59 +01:00
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fn(dirfd, entry);
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2017-12-06 20:21:13 +01:00
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}
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}
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2019-03-31 12:32:33 +02:00
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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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2017-12-06 20:21:13 +01:00
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void rm_rf(const char *path) {
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2019-02-12 08:44:46 +01:00
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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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2019-03-14 11:34:22 +01:00
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int fd = open(path, O_RDONLY | O_CLOEXEC);
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2017-12-15 19:02:17 +01:00
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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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2017-12-06 20:21:13 +01:00
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}
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2019-03-31 12:32:33 +02:00
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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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2017-12-06 20:21:13 +01:00
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}
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2017-10-11 20:57:18 +02:00
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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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2018-01-10 20:06:20 +01:00
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xmkdirs(destination, st.st_mode & 0777);
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2017-10-11 20:57:18 +02:00
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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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2017-10-13 18:08:12 +02:00
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xrename(source, destination);
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2017-10-11 20:57:18 +02:00
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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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2017-10-13 18:08:12 +02:00
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dir = xfdopendir(src);
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while ((entry = xreaddir(dir))) {
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2017-10-11 20:57:18 +02:00
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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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2017-10-13 18:08:12 +02:00
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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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2017-10-11 20:57:18 +02:00
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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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2018-01-10 20:06:20 +01:00
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xmkdirs(destination, a.st.st_mode & 0777);
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2017-10-11 20:57:18 +02:00
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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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2018-11-03 08:06:01 +01:00
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xsendfile(dest, src, nullptr, a.st.st_size);
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2017-10-11 20:57:18 +02:00
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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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2018-06-16 19:25:27 +02:00
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setattr(destination, &a);
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2017-10-11 20:57:18 +02:00
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}
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2019-03-31 12:32:33 +02:00
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void clone_dir(int src, int dest, bool overwrite) {
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2017-10-11 20:57:18 +02:00
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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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2017-10-13 18:08:12 +02:00
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dir = xfdopendir(src);
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while ((entry = xreaddir(dir))) {
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2017-10-11 20:57:18 +02:00
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if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0)
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continue;
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2019-03-31 12:32:33 +02:00
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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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2017-10-11 20:57:18 +02:00
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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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2017-10-13 18:08:12 +02:00
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xmkdirat(dest, entry->d_name, a.st.st_mode & 0777);
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2017-10-11 20:57:18 +02:00
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setattrat(dest, entry->d_name, &a);
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2017-10-13 18:08:12 +02:00
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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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2019-03-31 12:32:33 +02:00
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clone_dir(newsrc, newdest, overwrite);
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2017-10-11 20:57:18 +02:00
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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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2017-10-13 18:08:12 +02:00
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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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2019-03-14 11:34:22 +01:00
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xsendfile(destfd, srcfd, nullptr, a.st.st_size);
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2017-10-11 20:57:18 +02:00
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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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2017-10-13 18:08:12 +02:00
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xreadlinkat(src, entry->d_name, buf, sizeof(buf));
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2018-07-12 23:41:29 +02:00
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xsymlinkat(buf, dest, entry->d_name);
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2017-10-11 20:57:18 +02:00
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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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2018-02-01 20:22:38 +01:00
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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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2018-07-12 23:41:29 +02:00
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xlinkat(src, entry->d_name, dest, entry->d_name, 0);
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2018-02-01 20:22:38 +01:00
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}
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}
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}
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2017-10-11 20:57:18 +02:00
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int getattr(const char *path, struct file_attr *a) {
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2017-10-14 15:10:22 +02:00
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if (xlstat(path, &a->st) == -1)
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2017-10-11 20:57:18 +02:00
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return -1;
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2018-09-27 06:09:59 +02:00
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char *con;
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2017-10-14 15:10:22 +02:00
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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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2017-10-11 20:57:18 +02:00
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}
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2019-03-14 11:34:22 +01:00
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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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2018-07-12 23:41:29 +02:00
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return getattr(path, a);
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2017-10-11 20:57:18 +02:00
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}
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int fgetattr(int fd, struct file_attr *a) {
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2019-03-14 11:34:22 +01:00
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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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2017-10-11 20:57:18 +02:00
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}
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int setattr(const char *path, struct file_attr *a) {
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2017-10-14 15:10:22 +02:00
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if (chmod(path, a->st.st_mode & 0777) < 0)
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2017-10-11 20:57:18 +02:00
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return -1;
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2017-10-14 15:10:22 +02:00
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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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2019-03-14 11:34:22 +01:00
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if (a->con[0] && lsetfilecon(path, a->con) < 0)
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2017-10-14 15:10:22 +02:00
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return -1;
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return 0;
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2017-10-11 20:57:18 +02:00
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}
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2019-03-14 11:34:22 +01:00
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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));
|
2018-07-12 23:41:29 +02:00
|
|
|
return setattr(path, a);
|
2017-10-11 20:57:18 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
int fsetattr(int fd, struct file_attr *a) {
|
2019-03-14 11:34:22 +01:00
|
|
|
if (fchmod(fd, a->st.st_mode & 0777) < 0)
|
|
|
|
return -1;
|
|
|
|
if (fchown(fd, a->st.st_uid, a->st.st_gid) < 0)
|
|
|
|
return -1;
|
|
|
|
if (a->con[0] && fsetfilecon(fd, a->con) < 0)
|
|
|
|
return -1;
|
|
|
|
return 0;
|
2017-10-11 20:57:18 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
void clone_attr(const char *source, const char *target) {
|
|
|
|
struct file_attr a;
|
|
|
|
getattr(source, &a);
|
|
|
|
setattr(target, &a);
|
|
|
|
}
|
|
|
|
|
2019-01-20 05:59:37 +01:00
|
|
|
void fclone_attr(int sourcefd, int targetfd) {
|
2017-10-11 20:57:18 +02:00
|
|
|
struct file_attr a;
|
|
|
|
fgetattr(sourcefd, &a);
|
|
|
|
fsetattr(targetfd, &a);
|
|
|
|
}
|
2017-10-11 21:39:39 +02:00
|
|
|
|
2019-02-25 05:09:34 +01:00
|
|
|
void *__mmap(const char *filename, size_t *size, bool rw) {
|
2017-11-19 20:40:37 +01:00
|
|
|
struct stat st;
|
2019-02-25 05:09:34 +01:00
|
|
|
void *buf;
|
2018-04-14 21:18:18 +02:00
|
|
|
int fd = xopen(filename, (rw ? O_RDWR : O_RDONLY) | O_CLOEXEC);
|
2017-12-06 05:51:16 +01:00
|
|
|
fstat(fd, &st);
|
2017-11-19 20:40:37 +01:00
|
|
|
if (S_ISBLK(st.st_mode))
|
|
|
|
ioctl(fd, BLKGETSIZE64, size);
|
|
|
|
else
|
|
|
|
*size = st.st_size;
|
2019-02-25 05:09:34 +01:00
|
|
|
buf = *size > 0 ? xmmap(nullptr, *size, PROT_READ | (rw ? PROT_WRITE : 0), MAP_SHARED, fd, 0) : nullptr;
|
2017-11-09 18:51:41 +01:00
|
|
|
close(fd);
|
2019-02-25 05:09:34 +01:00
|
|
|
return buf;
|
2017-11-09 18:51:41 +01:00
|
|
|
}
|
|
|
|
|
2017-12-06 20:21:13 +01:00
|
|
|
void fd_full_read(int fd, void **buf, size_t *size) {
|
|
|
|
*size = lseek(fd, 0, SEEK_END);
|
|
|
|
lseek(fd, 0, SEEK_SET);
|
2018-02-05 04:34:31 +01:00
|
|
|
*buf = xmalloc(*size + 1);
|
2017-12-06 20:21:13 +01:00
|
|
|
xxread(fd, *buf, *size);
|
2018-02-05 04:34:31 +01:00
|
|
|
((char *) *buf)[*size] = '\0';
|
2017-12-06 20:21:13 +01:00
|
|
|
}
|
|
|
|
|
2017-12-06 18:30:48 +01:00
|
|
|
void full_read(const char *filename, void **buf, size_t *size) {
|
2018-04-14 21:18:18 +02:00
|
|
|
int fd = xopen(filename, O_RDONLY | O_CLOEXEC);
|
2017-12-06 18:30:48 +01:00
|
|
|
if (fd < 0) {
|
2018-11-03 08:06:01 +01:00
|
|
|
*buf = nullptr;
|
2017-12-06 18:30:48 +01:00
|
|
|
*size = 0;
|
|
|
|
return;
|
|
|
|
}
|
2017-12-06 20:21:13 +01:00
|
|
|
fd_full_read(fd, buf, size);
|
|
|
|
close(fd);
|
|
|
|
}
|
|
|
|
|
2017-11-09 18:51:41 +01:00
|
|
|
void write_zero(int fd, size_t size) {
|
2019-03-02 11:45:55 +01:00
|
|
|
char buf[4096] = {0};
|
|
|
|
size_t len;
|
|
|
|
while (size > 0) {
|
|
|
|
len = sizeof(buf) > size ? size : sizeof(buf);
|
|
|
|
write(fd, buf, len);
|
|
|
|
size -= len;
|
|
|
|
}
|
2017-11-09 18:51:41 +01:00
|
|
|
}
|
2018-11-03 08:06:01 +01:00
|
|
|
|
2019-03-06 02:27:09 +01:00
|
|
|
void file_readline(const char *file, const function<bool (string_view)> &fn, bool trim) {
|
|
|
|
FILE *fp = xfopen(file, "re");
|
2018-11-03 08:06:01 +01:00
|
|
|
if (fp == nullptr)
|
2019-02-18 04:30:23 +01:00
|
|
|
return;
|
|
|
|
size_t len = 1024;
|
|
|
|
char *buf = (char *) malloc(len);
|
|
|
|
char *start;
|
|
|
|
ssize_t read;
|
|
|
|
while ((read = getline(&buf, &len, fp)) >= 0) {
|
|
|
|
start = buf;
|
|
|
|
if (trim) {
|
2019-03-09 10:27:04 +01:00
|
|
|
while (read && (buf[read - 1] == '\n' || buf[read - 1] == ' '))
|
|
|
|
--read;
|
|
|
|
buf[read] = '\0';
|
2019-02-18 04:30:23 +01:00
|
|
|
while (*start == ' ')
|
|
|
|
++start;
|
|
|
|
}
|
2019-03-06 02:27:09 +01:00
|
|
|
if (!fn(start))
|
2019-02-18 04:30:23 +01:00
|
|
|
break;
|
2018-11-03 08:06:01 +01:00
|
|
|
}
|
|
|
|
fclose(fp);
|
2019-02-18 04:30:23 +01:00
|
|
|
free(buf);
|
2018-11-03 08:06:01 +01:00
|
|
|
}
|
2019-03-06 02:27:09 +01:00
|
|
|
|
|
|
|
void parse_prop_file(const char *file, const function<bool (string_view, string_view)> &fn) {
|
|
|
|
file_readline(file, [&](string_view line_view) -> bool {
|
|
|
|
char *line = (char *) line_view.data();
|
|
|
|
if (line[0] == '#')
|
|
|
|
return true;
|
|
|
|
char *eql = strchr(line, '=');
|
|
|
|
if (eql == nullptr || eql == line)
|
|
|
|
return true;
|
|
|
|
*eql = '\0';
|
|
|
|
return fn(line, eql + 1);
|
|
|
|
}, true);
|
|
|
|
}
|
2019-06-23 12:53:41 +02:00
|
|
|
|
|
|
|
void parse_mnt(const char *file, const function<bool (mntent*)> &fn) {
|
|
|
|
unique_ptr<FILE, decltype(&fclose)> fp(xfopen(file, "rce"), &fclose);
|
|
|
|
if (fp) {
|
|
|
|
mntent *mentry;
|
|
|
|
while ((mentry = getmntent(fp.get())) != nullptr) {
|
|
|
|
if (!fn(mentry))
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|