mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-11-28 12:35:26 +00:00
425 lines
10 KiB
C++
425 lines
10 KiB
C++
#include <sys/sendfile.h>
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#include <linux/fs.h>
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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 <utils.hpp>
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#include <selinux.hpp>
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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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if (fd_path(dirfd, path, size) < 0)
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return -1;
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auto len = strlen(path);
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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(string path, mode_t mode) {
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errno = 0;
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for (char *p = path.data() + 1; *p; ++p) {
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if (*p == '/') {
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*p = '\0';
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if (mkdir(path.data(), 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.data(), mode) == -1) {
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if (errno != EEXIST)
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return -1;
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}
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return 0;
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}
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template <typename Func>
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static void post_order_walk(int dirfd, const Func &fn) {
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auto dir = xopen_dir(dirfd);
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if (!dir) return;
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for (dirent *entry; (entry = xreaddir(dir.get()));) {
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if (entry->d_type == DT_DIR)
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post_order_walk(xopenat(dirfd, entry->d_name, O_RDONLY | O_CLOEXEC), fn);
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fn(dirfd, entry);
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}
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}
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template <typename Func>
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static void pre_order_walk(int dirfd, const Func &fn) {
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auto dir = xopen_dir(dirfd);
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if (!dir) return;
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for (dirent *entry; (entry = xreaddir(dir.get()));) {
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if (!fn(dirfd, entry))
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continue;
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if (entry->d_type == DT_DIR)
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pre_order_walk(xopenat(dirfd, entry->d_name, O_RDONLY | O_CLOEXEC), fn);
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}
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}
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static void remove_at(int dirfd, struct dirent *entry) {
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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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frm_rf(xopen(path, O_RDONLY | O_CLOEXEC));
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remove(path);
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}
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void frm_rf(int dirfd) {
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post_order_walk(dirfd, remove_at);
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}
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void mv_path(const char *src, const char *dest) {
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file_attr attr;
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getattr(src, &attr);
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if (S_ISDIR(attr.st.st_mode)) {
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if (access(dest, F_OK) != 0) {
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xmkdirs(dest, 0);
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setattr(dest, &attr);
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}
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mv_dir(xopen(src, O_RDONLY | O_CLOEXEC), xopen(dest, O_RDONLY | O_CLOEXEC));
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} else{
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xrename(src, dest);
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}
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rmdir(src);
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}
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void mv_dir(int src, int dest) {
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auto dir = xopen_dir(src);
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run_finally f([=]{ close(dest); });
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for (dirent *entry; (entry = xreaddir(dir.get()));) {
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switch (entry->d_type) {
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case DT_DIR:
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if (faccessat(dest, entry->d_name, F_OK, 0) == 0) {
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// Destination folder exists, needs recursive move
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int newsrc = xopenat(src, entry->d_name, O_RDONLY | O_CLOEXEC);
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int newdest = xopenat(dest, entry->d_name, O_RDONLY | O_CLOEXEC);
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mv_dir(newsrc, newdest);
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unlinkat(src, entry->d_name, AT_REMOVEDIR);
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break;
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}
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// Else fall through
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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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break;
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}
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}
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}
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void cp_afc(const char *src, const char *dest) {
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file_attr a;
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getattr(src, &a);
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if (S_ISDIR(a.st.st_mode)) {
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xmkdirs(dest, 0);
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clone_dir(xopen(src, O_RDONLY | O_CLOEXEC), xopen(dest, O_RDONLY | O_CLOEXEC));
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} else{
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unlink(dest);
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if (S_ISREG(a.st.st_mode)) {
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int sfd = xopen(src, O_RDONLY | O_CLOEXEC);
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int dfd = xopen(dest, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, 0);
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xsendfile(dfd, sfd, nullptr, a.st.st_size);
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close(sfd);
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close(dfd);
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} else if (S_ISLNK(a.st.st_mode)) {
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char buf[4096];
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xreadlink(src, buf, sizeof(buf));
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xsymlink(buf, dest);
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}
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}
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setattr(dest, &a);
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}
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void clone_dir(int src, int dest) {
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auto dir = xopen_dir(src);
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run_finally f([&]{ close(dest); });
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for (dirent *entry; (entry = xreaddir(dir.get()));) {
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file_attr a;
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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, 0);
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setattrat(dest, entry->d_name, &a);
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int sfd = xopenat(src, entry->d_name, O_RDONLY | O_CLOEXEC);
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int dst = xopenat(dest, entry->d_name, O_RDONLY | O_CLOEXEC);
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clone_dir(sfd, dst);
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break;
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}
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case DT_REG: {
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int sfd = xopenat(src, entry->d_name, O_RDONLY | O_CLOEXEC);
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int dfd = xopenat(dest, entry->d_name, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, 0);
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xsendfile(dfd, sfd, nullptr, a.st.st_size);
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fsetattr(dfd, &a);
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close(dfd);
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close(sfd);
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break;
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}
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case DT_LNK: {
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char buf[4096];
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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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}
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void link_path(const char *src, const char *dest) {
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link_dir(xopen(src, O_RDONLY | O_CLOEXEC), xopen(dest, O_RDONLY | O_CLOEXEC));
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}
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void link_dir(int src, int dest) {
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auto dir = xopen_dir(src);
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run_finally f([&]{ close(dest); });
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for (dirent *entry; (entry = xreaddir(dir.get()));) {
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if (entry->d_type == DT_DIR) {
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file_attr a;
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getattrat(src, entry->d_name, &a);
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xmkdirat(dest, entry->d_name, 0);
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setattrat(dest, entry->d_name, &a);
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int sfd = xopenat(src, entry->d_name, O_RDONLY | O_CLOEXEC);
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int dfd = xopenat(dest, entry->d_name, O_RDONLY | O_CLOEXEC);
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link_dir(sfd, dfd);
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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, 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, 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, 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, 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, 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, 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 *src, const char *dest) {
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file_attr a;
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getattr(src, &a);
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setattr(dest, &a);
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}
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void fclone_attr(int src, int dest) {
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file_attr a;
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fgetattr(src, &a);
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fsetattr(dest, &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 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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string fd_full_read(int fd) {
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char buf[4096];
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string str;
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for (ssize_t len; (len = xread(fd, buf, sizeof(buf))) > 0;)
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str.insert(str.end(), buf, buf + len);
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return str;
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}
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string full_read(const char *filename) {
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int fd = xopen(filename, O_RDONLY | O_CLOEXEC);
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run_finally f([=]{ close(fd); });
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return fd < 0 ? "" : fd_full_read(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(bool trim, const char *file, const function<bool(string_view)> &fn) {
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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 && "\n\r "sv.find(buf[read - 1]) != string::npos)
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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(true, 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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});
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}
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void parse_mnt(const char *file, const function<bool(mntent*)> &fn) {
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auto fp = sFILE(setmntent(file, "re"), endmntent);
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if (fp) {
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mntent mentry{};
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char buf[4096];
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while (getmntent_r(fp.get(), &mentry, buf, sizeof(buf))) {
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if (!fn(&mentry))
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break;
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}
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}
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}
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void backup_folder(const char *dir, vector<raw_file> &files) {
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char path[4096];
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xrealpath(dir, path);
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int len = strlen(path);
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pre_order_walk(xopen(dir, O_RDONLY), [&](int dfd, dirent *entry) -> bool {
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int fd = xopenat(dfd, entry->d_name, O_RDONLY);
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if (fd < 0)
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return false;
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run_finally f([&]{ close(fd); });
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if (fd_path(fd, path, sizeof(path)) < 0)
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return false;
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raw_file file;
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file.path = path + len + 1;
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if (fgetattr(fd, &file.attr) < 0)
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return false;
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if (entry->d_type == DT_REG) {
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fd_full_read(fd, file.buf, file.sz);
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} else if (entry->d_type == DT_LNK) {
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xreadlinkat(dfd, entry->d_name, path, sizeof(path));
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file.sz = strlen(path) + 1;
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file.buf = (uint8_t *) xmalloc(file.sz);
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memcpy(file.buf, path, file.sz);
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}
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files.emplace_back(std::move(file));
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return true;
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});
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}
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void restore_folder(const char *dir, vector<raw_file> &files) {
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string base(dir);
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// Pre-order means folders will always be first
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for (raw_file &file : files) {
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string path = base + "/" + file.path;
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if (S_ISDIR(file.attr.st.st_mode)) {
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mkdirs(path.data(), 0);
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} else if (S_ISREG(file.attr.st.st_mode)) {
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auto fp = xopen_file(path.data(), "we");
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fwrite(file.buf, 1, file.sz, fp.get());
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} else if (S_ISLNK(file.attr.st.st_mode)) {
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symlink((char *)file.buf, path.data());
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}
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setattr(path.data(), &file.attr);
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}
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}
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