mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-12-18 22:17:40 +00:00
3da318b48e
faccessat() should return 0 when success, but it returns random number with errno == 0 in x86 platform. It’s a side effect of commit bf80b08b5febd3f311108ff1c6e6a6bf2d1113b7 when magisk binaries ‘corretly’ linked with library of API16 .. lol Co-authored-by: John Wu <topjohnwu@gmail.com>
454 lines
12 KiB
C++
454 lines
12 KiB
C++
#include <sys/sendfile.h>
|
|
#include <linux/fs.h>
|
|
#include <stdlib.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <libgen.h>
|
|
|
|
#include <utils.hpp>
|
|
#include <selinux.hpp>
|
|
|
|
using namespace std;
|
|
|
|
ssize_t fd_path(int fd, char *path, size_t size) {
|
|
snprintf(path, size, "/proc/self/fd/%d", fd);
|
|
return xreadlink(path, path, size);
|
|
}
|
|
|
|
int fd_pathat(int dirfd, const char *name, char *path, size_t size) {
|
|
if (fd_path(dirfd, path, size) < 0)
|
|
return -1;
|
|
auto len = strlen(path);
|
|
path[len] = '/';
|
|
strlcpy(path + len + 1, name, size - len - 1);
|
|
return 0;
|
|
}
|
|
|
|
int mkdirs(string path, mode_t mode) {
|
|
errno = 0;
|
|
for (char *p = path.data() + 1; *p; ++p) {
|
|
if (*p == '/') {
|
|
*p = '\0';
|
|
if (mkdir(path.data(), mode) == -1) {
|
|
if (errno != EEXIST)
|
|
return -1;
|
|
}
|
|
*p = '/';
|
|
}
|
|
}
|
|
if (mkdir(path.data(), mode) == -1) {
|
|
if (errno != EEXIST)
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
template <typename Func>
|
|
static void post_order_walk(int dirfd, const Func &fn) {
|
|
auto dir = xopen_dir(dirfd);
|
|
if (!dir) return;
|
|
|
|
for (dirent *entry; (entry = xreaddir(dir.get()));) {
|
|
if (entry->d_type == DT_DIR)
|
|
post_order_walk(xopenat(dirfd, entry->d_name, O_RDONLY | O_CLOEXEC), fn);
|
|
fn(dirfd, entry);
|
|
}
|
|
}
|
|
|
|
template <typename Func>
|
|
static void pre_order_walk(int dirfd, const Func &fn) {
|
|
auto dir = xopen_dir(dirfd);
|
|
if (!dir) return;
|
|
|
|
for (dirent *entry; (entry = xreaddir(dir.get()));) {
|
|
if (!fn(dirfd, entry))
|
|
continue;
|
|
if (entry->d_type == DT_DIR)
|
|
pre_order_walk(xopenat(dirfd, entry->d_name, O_RDONLY | O_CLOEXEC), fn);
|
|
}
|
|
}
|
|
|
|
static void remove_at(int dirfd, struct dirent *entry) {
|
|
unlinkat(dirfd, entry->d_name, entry->d_type == DT_DIR ? AT_REMOVEDIR : 0);
|
|
}
|
|
|
|
void rm_rf(const char *path) {
|
|
struct stat st;
|
|
if (lstat(path, &st) < 0)
|
|
return;
|
|
if (S_ISDIR(st.st_mode))
|
|
frm_rf(xopen(path, O_RDONLY | O_CLOEXEC));
|
|
remove(path);
|
|
}
|
|
|
|
void frm_rf(int dirfd) {
|
|
post_order_walk(dirfd, remove_at);
|
|
}
|
|
|
|
void mv_path(const char *src, const char *dest) {
|
|
file_attr attr;
|
|
getattr(src, &attr);
|
|
if (S_ISDIR(attr.st.st_mode)) {
|
|
if (access(dest, F_OK) != 0) {
|
|
xmkdirs(dest, 0);
|
|
setattr(dest, &attr);
|
|
}
|
|
mv_dir(xopen(src, O_RDONLY | O_CLOEXEC), xopen(dest, O_RDONLY | O_CLOEXEC));
|
|
} else{
|
|
xrename(src, dest);
|
|
}
|
|
rmdir(src);
|
|
}
|
|
|
|
void mv_dir(int src, int dest) {
|
|
auto dir = xopen_dir(src);
|
|
run_finally f([=]{ close(dest); });
|
|
for (dirent *entry; (entry = xreaddir(dir.get()));) {
|
|
switch (entry->d_type) {
|
|
case DT_DIR:
|
|
if (xfaccessat(dest, entry->d_name) == 0) {
|
|
// Destination folder exists, needs recursive move
|
|
int newsrc = xopenat(src, entry->d_name, O_RDONLY | O_CLOEXEC);
|
|
int newdest = xopenat(dest, entry->d_name, O_RDONLY | O_CLOEXEC);
|
|
mv_dir(newsrc, newdest);
|
|
unlinkat(src, entry->d_name, AT_REMOVEDIR);
|
|
break;
|
|
}
|
|
// Else fall through
|
|
case DT_LNK:
|
|
case DT_REG:
|
|
renameat(src, entry->d_name, dest, entry->d_name);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void cp_afc(const char *src, const char *dest) {
|
|
file_attr a;
|
|
getattr(src, &a);
|
|
|
|
if (S_ISDIR(a.st.st_mode)) {
|
|
xmkdirs(dest, 0);
|
|
clone_dir(xopen(src, O_RDONLY | O_CLOEXEC), xopen(dest, O_RDONLY | O_CLOEXEC));
|
|
} else{
|
|
unlink(dest);
|
|
if (S_ISREG(a.st.st_mode)) {
|
|
int sfd = xopen(src, O_RDONLY | O_CLOEXEC);
|
|
int dfd = xopen(dest, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, 0);
|
|
xsendfile(dfd, sfd, nullptr, a.st.st_size);
|
|
close(sfd);
|
|
close(dfd);
|
|
} else if (S_ISLNK(a.st.st_mode)) {
|
|
char buf[4096];
|
|
xreadlink(src, buf, sizeof(buf));
|
|
xsymlink(buf, dest);
|
|
}
|
|
}
|
|
setattr(dest, &a);
|
|
}
|
|
|
|
void clone_dir(int src, int dest) {
|
|
auto dir = xopen_dir(src);
|
|
run_finally f([&]{ close(dest); });
|
|
for (dirent *entry; (entry = xreaddir(dir.get()));) {
|
|
file_attr a;
|
|
getattrat(src, entry->d_name, &a);
|
|
switch (entry->d_type) {
|
|
case DT_DIR: {
|
|
xmkdirat(dest, entry->d_name, 0);
|
|
setattrat(dest, entry->d_name, &a);
|
|
int sfd = xopenat(src, entry->d_name, O_RDONLY | O_CLOEXEC);
|
|
int dst = xopenat(dest, entry->d_name, O_RDONLY | O_CLOEXEC);
|
|
clone_dir(sfd, dst);
|
|
break;
|
|
}
|
|
case DT_REG: {
|
|
int sfd = xopenat(src, entry->d_name, O_RDONLY | O_CLOEXEC);
|
|
int dfd = xopenat(dest, entry->d_name, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, 0);
|
|
xsendfile(dfd, sfd, nullptr, a.st.st_size);
|
|
fsetattr(dfd, &a);
|
|
close(dfd);
|
|
close(sfd);
|
|
break;
|
|
}
|
|
case DT_LNK: {
|
|
char buf[4096];
|
|
xreadlinkat(src, entry->d_name, buf, sizeof(buf));
|
|
xsymlinkat(buf, dest, entry->d_name);
|
|
setattrat(dest, entry->d_name, &a);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void link_path(const char *src, const char *dest) {
|
|
link_dir(xopen(src, O_RDONLY | O_CLOEXEC), xopen(dest, O_RDONLY | O_CLOEXEC));
|
|
}
|
|
|
|
void link_dir(int src, int dest) {
|
|
auto dir = xopen_dir(src);
|
|
run_finally f([&]{ close(dest); });
|
|
for (dirent *entry; (entry = xreaddir(dir.get()));) {
|
|
if (entry->d_type == DT_DIR) {
|
|
file_attr a;
|
|
getattrat(src, entry->d_name, &a);
|
|
xmkdirat(dest, entry->d_name, 0);
|
|
setattrat(dest, entry->d_name, &a);
|
|
int sfd = xopenat(src, entry->d_name, O_RDONLY | O_CLOEXEC);
|
|
int dfd = xopenat(dest, entry->d_name, O_RDONLY | O_CLOEXEC);
|
|
link_dir(sfd, dfd);
|
|
} else {
|
|
xlinkat(src, entry->d_name, dest, entry->d_name, 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
int getattr(const char *path, file_attr *a) {
|
|
if (xlstat(path, &a->st) == -1)
|
|
return -1;
|
|
char *con;
|
|
if (lgetfilecon(path, &con) == -1)
|
|
return -1;
|
|
strcpy(a->con, con);
|
|
freecon(con);
|
|
return 0;
|
|
}
|
|
|
|
int getattrat(int dirfd, const char *name, file_attr *a) {
|
|
char path[4096];
|
|
fd_pathat(dirfd, name, path, sizeof(path));
|
|
return getattr(path, a);
|
|
}
|
|
|
|
int fgetattr(int fd, file_attr *a) {
|
|
if (xfstat(fd, &a->st) < 0)
|
|
return -1;
|
|
char *con;
|
|
if (fgetfilecon(fd, &con) < 0)
|
|
return -1;
|
|
strcpy(a->con, con);
|
|
freecon(con);
|
|
return 0;
|
|
}
|
|
|
|
int setattr(const char *path, file_attr *a) {
|
|
if (chmod(path, a->st.st_mode & 0777) < 0)
|
|
return -1;
|
|
if (chown(path, a->st.st_uid, a->st.st_gid) < 0)
|
|
return -1;
|
|
if (a->con[0] && lsetfilecon(path, a->con) < 0)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
int setattrat(int dirfd, const char *name, file_attr *a) {
|
|
char path[4096];
|
|
fd_pathat(dirfd, name, path, sizeof(path));
|
|
return setattr(path, a);
|
|
}
|
|
|
|
int fsetattr(int fd, file_attr *a) {
|
|
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;
|
|
}
|
|
|
|
void clone_attr(const char *src, const char *dest) {
|
|
file_attr a;
|
|
getattr(src, &a);
|
|
setattr(dest, &a);
|
|
}
|
|
|
|
void fclone_attr(int src, int dest) {
|
|
file_attr a;
|
|
fgetattr(src, &a);
|
|
fsetattr(dest, &a);
|
|
}
|
|
|
|
void *__mmap(const char *filename, size_t *size, bool rw) {
|
|
int fd = xopen(filename, (rw ? O_RDWR : O_RDONLY) | O_CLOEXEC);
|
|
if (fd < 0) {
|
|
*size = 0;
|
|
return nullptr;
|
|
}
|
|
struct stat st;
|
|
if (fstat(fd, &st)) {
|
|
*size = 0;
|
|
return nullptr;
|
|
}
|
|
if (S_ISBLK(st.st_mode))
|
|
ioctl(fd, BLKGETSIZE64, size);
|
|
else
|
|
*size = st.st_size;
|
|
void *buf = *size > 0 ?
|
|
xmmap(nullptr, *size, PROT_READ | PROT_WRITE, rw ? MAP_SHARED : MAP_PRIVATE, fd, 0) :
|
|
nullptr;
|
|
close(fd);
|
|
return buf;
|
|
}
|
|
|
|
void fd_full_read(int fd, void **buf, size_t *size) {
|
|
*size = lseek(fd, 0, SEEK_END);
|
|
lseek(fd, 0, SEEK_SET);
|
|
*buf = xmalloc(*size + 1);
|
|
xxread(fd, *buf, *size);
|
|
((char *) *buf)[*size] = '\0';
|
|
}
|
|
|
|
void full_read(const char *filename, void **buf, size_t *size) {
|
|
int fd = xopen(filename, O_RDONLY | O_CLOEXEC);
|
|
if (fd < 0) {
|
|
*buf = nullptr;
|
|
*size = 0;
|
|
return;
|
|
}
|
|
fd_full_read(fd, buf, size);
|
|
close(fd);
|
|
}
|
|
|
|
string fd_full_read(int fd) {
|
|
char buf[4096];
|
|
string str;
|
|
for (ssize_t len; (len = xread(fd, buf, sizeof(buf))) > 0;)
|
|
str.insert(str.end(), buf, buf + len);
|
|
return str;
|
|
}
|
|
|
|
string full_read(const char *filename) {
|
|
int fd = xopen(filename, O_RDONLY | O_CLOEXEC);
|
|
run_finally f([=]{ close(fd); });
|
|
return fd < 0 ? "" : fd_full_read(fd);
|
|
}
|
|
|
|
void write_zero(int fd, size_t size) {
|
|
char buf[4096] = {0};
|
|
size_t len;
|
|
while (size > 0) {
|
|
len = sizeof(buf) > size ? size : sizeof(buf);
|
|
write(fd, buf, len);
|
|
size -= len;
|
|
}
|
|
}
|
|
|
|
void file_readline(bool trim, const char *file, const function<bool(string_view)> &fn) {
|
|
FILE *fp = xfopen(file, "re");
|
|
if (fp == nullptr)
|
|
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) {
|
|
while (read && "\n\r "sv.find(buf[read - 1]) != string::npos)
|
|
--read;
|
|
buf[read] = '\0';
|
|
while (*start == ' ')
|
|
++start;
|
|
}
|
|
if (!fn(start))
|
|
break;
|
|
}
|
|
fclose(fp);
|
|
free(buf);
|
|
}
|
|
|
|
void parse_prop_file(const char *file, const function<bool(string_view, string_view)> &fn) {
|
|
file_readline(true, 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);
|
|
});
|
|
}
|
|
|
|
void parse_mnt(const char *file, const function<bool(mntent*)> &fn) {
|
|
auto fp = sFILE(setmntent(file, "re"), endmntent);
|
|
if (fp) {
|
|
mntent mentry{};
|
|
char buf[4096];
|
|
while (getmntent_r(fp.get(), &mentry, buf, sizeof(buf))) {
|
|
if (!fn(&mentry))
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void backup_folder(const char *dir, vector<raw_file> &files) {
|
|
char path[4096];
|
|
xrealpath(dir, path);
|
|
int len = strlen(path);
|
|
pre_order_walk(xopen(dir, O_RDONLY), [&](int dfd, dirent *entry) -> bool {
|
|
int fd = xopenat(dfd, entry->d_name, O_RDONLY);
|
|
if (fd < 0)
|
|
return false;
|
|
run_finally f([&]{ close(fd); });
|
|
if (fd_path(fd, path, sizeof(path)) < 0)
|
|
return false;
|
|
raw_file file;
|
|
file.path = path + len + 1;
|
|
if (fgetattr(fd, &file.attr) < 0)
|
|
return false;
|
|
if (entry->d_type == DT_REG) {
|
|
fd_full_read(fd, file.buf, file.sz);
|
|
} else if (entry->d_type == DT_LNK) {
|
|
xreadlinkat(dfd, entry->d_name, path, sizeof(path));
|
|
file.sz = strlen(path) + 1;
|
|
file.buf = (uint8_t *) xmalloc(file.sz);
|
|
memcpy(file.buf, path, file.sz);
|
|
}
|
|
files.emplace_back(std::move(file));
|
|
return true;
|
|
});
|
|
}
|
|
|
|
void restore_folder(const char *dir, vector<raw_file> &files) {
|
|
string base(dir);
|
|
// Pre-order means folders will always be first
|
|
for (raw_file &file : files) {
|
|
string path = base + "/" + file.path;
|
|
if (S_ISDIR(file.attr.st.st_mode)) {
|
|
mkdirs(path.data(), 0);
|
|
} else if (S_ISREG(file.attr.st.st_mode)) {
|
|
auto fp = xopen_file(path.data(), "we");
|
|
fwrite(file.buf, 1, file.sz, fp.get());
|
|
} else if (S_ISLNK(file.attr.st.st_mode)) {
|
|
symlink((char *)file.buf, path.data());
|
|
}
|
|
setattr(path.data(), &file.attr);
|
|
}
|
|
}
|
|
|
|
sDIR make_dir(DIR *dp) {
|
|
return sDIR(dp, [](DIR *dp){ return dp ? closedir(dp) : 1; });
|
|
}
|
|
|
|
sFILE make_file(FILE *fp) {
|
|
return sFILE(fp, [](FILE *fp){ return fp ? fclose(fp) : 1; });
|
|
}
|
|
|
|
raw_file::raw_file(raw_file &&o) {
|
|
path.swap(o.path);
|
|
attr = o.attr;
|
|
buf = o.buf;
|
|
sz = o.sz;
|
|
o.buf = nullptr;
|
|
o.sz = 0;
|
|
}
|
|
|
|
raw_file::~raw_file() {
|
|
free(buf);
|
|
}
|