360 lines
11 KiB
C++
360 lines
11 KiB
C++
#include <dlfcn.h>
|
|
#include <sys/types.h>
|
|
#include <vector>
|
|
#include <map>
|
|
|
|
#include <resetprop.hpp>
|
|
#include <utils.hpp>
|
|
|
|
#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
|
|
#include <_system_properties.h>
|
|
|
|
#include "_resetprop.hpp"
|
|
|
|
using namespace std;
|
|
|
|
static bool verbose = false;
|
|
|
|
#ifdef APPLET_STUB_MAIN
|
|
#define system_property_set __system_property_set
|
|
#define system_property_find __system_property_find
|
|
#define system_property_read_callback __system_property_read_callback
|
|
#define system_property_foreach __system_property_foreach
|
|
#define system_property_read(...)
|
|
extern "C" int fsetxattr(int fd, const char* name, const void* value, size_t size, int flags) {
|
|
return syscall(__NR_fsetxattr, fd, name, value, size, flags);
|
|
}
|
|
#else
|
|
static int (*system_property_set)(const char*, const char*);
|
|
static int (*system_property_read)(const prop_info*, char*, char*);
|
|
static const prop_info *(*system_property_find)(const char*);
|
|
static void (*system_property_read_callback)(
|
|
const prop_info*, void (*)(void*, const char*, const char*, uint32_t), void*);
|
|
static int (*system_property_foreach)(void (*)(const prop_info*, void*), void*);
|
|
|
|
#define DLOAD(name) \
|
|
*(void **) &name = dlsym(RTLD_DEFAULT, "__" #name)
|
|
|
|
static void load_functions() {
|
|
DLOAD(system_property_set);
|
|
DLOAD(system_property_read);
|
|
DLOAD(system_property_find);
|
|
DLOAD(system_property_read_callback);
|
|
DLOAD(system_property_foreach);
|
|
}
|
|
#undef DLOAD
|
|
#endif
|
|
|
|
[[noreturn]] static void usage(char* arg0) {
|
|
fprintf(stderr,
|
|
R"EOF(resetprop - System Property Manipulation Tool
|
|
|
|
Usage: %s [flags] [options...]
|
|
|
|
Options:
|
|
-h, --help show this message
|
|
(no arguments) print all properties
|
|
NAME get property
|
|
NAME VALUE set property entry NAME with VALUE
|
|
--file FILE load props from FILE
|
|
--delete NAME delete property
|
|
|
|
Flags:
|
|
-v print verbose output to stderr
|
|
-n set props without going through property_service
|
|
(this flag only affects setprop)
|
|
-p read/write props from/to persistent storage
|
|
(this flag only affects getprop and delprop)
|
|
|
|
)EOF", arg0);
|
|
exit(1);
|
|
}
|
|
|
|
static bool check_legal_property_name(const char *name) {
|
|
int namelen = strlen(name);
|
|
|
|
if (namelen < 1) goto illegal;
|
|
if (name[0] == '.') goto illegal;
|
|
if (name[namelen - 1] == '.') goto illegal;
|
|
|
|
/* Only allow alphanumeric, plus '.', '-', '@', ':', or '_' */
|
|
/* Don't allow ".." to appear in a property name */
|
|
for (size_t i = 0; i < namelen; i++) {
|
|
if (name[i] == '.') {
|
|
// i=0 is guaranteed to never have a dot. See above.
|
|
if (name[i-1] == '.') goto illegal;
|
|
continue;
|
|
}
|
|
if (name[i] == '_' || name[i] == '-' || name[i] == '@' || name[i] == ':') continue;
|
|
if (name[i] >= 'a' && name[i] <= 'z') continue;
|
|
if (name[i] >= 'A' && name[i] <= 'Z') continue;
|
|
if (name[i] >= '0' && name[i] <= '9') continue;
|
|
goto illegal;
|
|
}
|
|
|
|
return true;
|
|
|
|
illegal:
|
|
LOGE("Illegal property name: [%s]\n", name);
|
|
return false;
|
|
}
|
|
|
|
static void read_prop(const prop_info *pi, void *cb) {
|
|
if (system_property_read_callback) {
|
|
auto callback = [](void *cb, const char *name, const char *value, uint32_t) {
|
|
static_cast<prop_cb*>(cb)->exec(name, value);
|
|
};
|
|
system_property_read_callback(pi, callback, cb);
|
|
} else {
|
|
char name[PROP_NAME_MAX];
|
|
char value[PROP_VALUE_MAX];
|
|
name[0] = '\0';
|
|
value[0] = '\0';
|
|
system_property_read(pi, name, value);
|
|
static_cast<prop_cb*>(cb)->exec(name, value);
|
|
}
|
|
}
|
|
|
|
struct sysprop_stub {
|
|
virtual int setprop(const char *name, const char *value, bool trigger) { return 1; }
|
|
virtual string getprop(const char *name, bool persist) { return string(); }
|
|
virtual void getprops(void (*callback)(const char *, const char *, void *),
|
|
void *cookie, bool persist) {}
|
|
virtual int delprop(const char *name, bool persist) { return 1; }
|
|
};
|
|
|
|
struct sysprop : public sysprop_stub {
|
|
|
|
int setprop(const char *name, const char *value, bool) override {
|
|
if (!check_legal_property_name(name))
|
|
return 1;
|
|
return system_property_set(name, value);
|
|
}
|
|
|
|
struct prop_to_string : prop_cb {
|
|
explicit prop_to_string(string &s) : val(s) {}
|
|
void exec(const char *, const char *value) override {
|
|
val = value;
|
|
}
|
|
private:
|
|
string &val;
|
|
};
|
|
|
|
string getprop(const char *name, bool) override {
|
|
string val;
|
|
if (!check_legal_property_name(name))
|
|
return val;
|
|
auto pi = system_property_find(name);
|
|
if (pi == nullptr)
|
|
return val;
|
|
auto prop = prop_to_string(val);
|
|
read_prop(pi, &prop);
|
|
LOGD("resetprop: getprop [%s]: [%s]\n", name, val.data());
|
|
return val;
|
|
}
|
|
|
|
void getprops(void (*callback)(const char*, const char*, void*), void *cookie, bool) override {
|
|
prop_list list;
|
|
prop_collector collector(list);
|
|
system_property_foreach(read_prop, &collector);
|
|
for (auto &[key, val] : list)
|
|
callback(key.data(), val.data(), cookie);
|
|
}
|
|
};
|
|
|
|
struct resetprop : public sysprop {
|
|
|
|
int setprop(const char *name, const char *value, bool prop_svc) override {
|
|
if (!check_legal_property_name(name))
|
|
return 1;
|
|
|
|
const char *msg = prop_svc ? "property_service" : "modifying prop data structure";
|
|
|
|
int ret;
|
|
auto pi = const_cast<prop_info *>(__system_property_find(name));
|
|
|
|
// Always delete existing read-only properties, because they could be
|
|
// long properties and cannot directly go through __system_property_update
|
|
if (pi != nullptr && str_starts(name, "ro.")) {
|
|
delprop(name, false);
|
|
pi = nullptr;
|
|
}
|
|
|
|
if (pi != nullptr) {
|
|
if (prop_svc) {
|
|
ret = system_property_set(name, value);
|
|
} else {
|
|
ret = __system_property_update(pi, value, strlen(value));
|
|
}
|
|
LOGD("resetprop: update prop [%s]: [%s] by %s\n", name, value, msg);
|
|
} else {
|
|
if (prop_svc) {
|
|
ret = system_property_set(name, value);
|
|
} else {
|
|
ret = __system_property_add(name, strlen(name), value, strlen(value));
|
|
}
|
|
LOGD("resetprop: create prop [%s]: [%s] by %s\n", name, value, msg);
|
|
}
|
|
|
|
if (ret)
|
|
LOGW("resetprop: setprop error\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
string getprop(const char *name, bool persist) override {
|
|
string val = sysprop::getprop(name, persist);
|
|
if (val.empty() && persist && strncmp(name, "persist.", 8) == 0)
|
|
val = persist_getprop(name);
|
|
if (val.empty())
|
|
LOGD("resetprop: prop [%s] does not exist\n", name);
|
|
return val;
|
|
}
|
|
|
|
void getprops(void (*callback)(const char *, const char *, void *),
|
|
void *cookie, bool persist) override {
|
|
prop_list list;
|
|
prop_collector collector(list);
|
|
system_property_foreach(read_prop, &collector);
|
|
if (persist)
|
|
persist_getprops(&collector);
|
|
for (auto &[key, val] : list)
|
|
callback(key.data(), val.data(), cookie);
|
|
}
|
|
|
|
// Not an error when something is deleted
|
|
int delprop(const char *name, bool persist) override {
|
|
if (!check_legal_property_name(name))
|
|
return 1;
|
|
LOGD("resetprop: delete prop [%s]\n", name);
|
|
|
|
int ret = __system_property_delete(name);
|
|
if (persist && str_starts(name, "persist.")) {
|
|
if (persist_deleteprop(name))
|
|
ret = 0;
|
|
}
|
|
return ret;
|
|
}
|
|
};
|
|
|
|
static sysprop_stub *get_impl() {
|
|
static sysprop_stub *impl = nullptr;
|
|
if (impl == nullptr) {
|
|
use_pb = access(PERSISTENT_PROPERTY_DIR "/persistent_properties", R_OK) == 0;
|
|
#ifdef APPLET_STUB_MAIN
|
|
if (__system_properties_init()) {
|
|
LOGE("resetprop: __system_properties_init error\n");
|
|
exit(1);
|
|
}
|
|
impl = new resetprop();
|
|
#else
|
|
// Load platform implementations
|
|
load_functions();
|
|
if (__system_properties_init()) {
|
|
LOGW("resetprop: __system_properties_init error\n");
|
|
impl = new sysprop();
|
|
} else {
|
|
impl = new resetprop();
|
|
}
|
|
#endif
|
|
}
|
|
return impl;
|
|
}
|
|
|
|
/***********************************
|
|
* Implementation of top-level APIs
|
|
***********************************/
|
|
|
|
static void print_props(bool persist) {
|
|
getprops([](const char *name, const char *value, auto) {
|
|
printf("[%s]: [%s]\n", name, value);
|
|
}, nullptr, persist);
|
|
}
|
|
|
|
string getprop(const char *name, bool persist) {
|
|
return get_impl()->getprop(name, persist);
|
|
}
|
|
|
|
void getprops(void (*callback)(const char *, const char *, void *), void *cookie, bool persist) {
|
|
get_impl()->getprops(callback, cookie, persist);
|
|
}
|
|
|
|
int setprop(const char *name, const char *value, bool prop_svc) {
|
|
return get_impl()->setprop(name, value, prop_svc);
|
|
}
|
|
|
|
int delprop(const char *name, bool persist) {
|
|
return get_impl()->delprop(name, persist);
|
|
}
|
|
|
|
void load_prop_file(const char *filename, bool prop_svc) {
|
|
auto impl = get_impl();
|
|
LOGD("resetprop: Parse prop file [%s]\n", filename);
|
|
parse_prop_file(filename, [=](auto key, auto val) -> bool {
|
|
impl->setprop(key.data(), val.data(), prop_svc);
|
|
return true;
|
|
});
|
|
}
|
|
|
|
int resetprop_main(int argc, char *argv[]) {
|
|
log_cb.d = [](auto fmt, auto ap) -> int { return verbose ? vfprintf(stderr, fmt, ap) : 0; };
|
|
|
|
bool prop_svc = true;
|
|
bool persist = false;
|
|
char *argv0 = argv[0];
|
|
|
|
--argc;
|
|
++argv;
|
|
|
|
// Parse flags and -- options
|
|
while (argc && argv[0][0] == '-') {
|
|
for (int idx = 1; true; ++idx) {
|
|
switch (argv[0][idx]) {
|
|
case '-':
|
|
if (strcmp(argv[0], "--file") == 0 && argc == 2) {
|
|
load_prop_file(argv[1], prop_svc);
|
|
return 0;
|
|
} else if (strcmp(argv[0], "--delete") == 0 && argc == 2) {
|
|
return delprop(argv[1], persist);
|
|
} else if (strcmp(argv[0], "--help") == 0) {
|
|
usage(argv0);
|
|
}
|
|
case 'v':
|
|
verbose = true;
|
|
continue;
|
|
case 'p':
|
|
persist = true;
|
|
continue;
|
|
case 'n':
|
|
prop_svc = false;
|
|
continue;
|
|
case '\0':
|
|
break;
|
|
case 'h':
|
|
default:
|
|
usage(argv0);
|
|
}
|
|
break;
|
|
}
|
|
--argc;
|
|
++argv;
|
|
}
|
|
|
|
switch (argc) {
|
|
case 0:
|
|
print_props(persist);
|
|
return 0;
|
|
case 1: {
|
|
string prop = getprop(argv[0], persist);
|
|
if (prop.empty())
|
|
return 1;
|
|
printf("%s\n", prop.data());
|
|
return 0;
|
|
}
|
|
case 2:
|
|
return setprop(argv[0], argv[1], prop_svc);
|
|
default:
|
|
usage(argv0);
|
|
}
|
|
}
|