Magisk/native/jni/resetprop/resetprop.cpp

408 lines
10 KiB
C++
Raw Normal View History

2017-04-14 00:06:41 +02:00
/* resetprop.cpp - Manipulate any system props
2017-08-14 19:25:54 +02:00
*
2017-02-28 09:52:27 +01:00
* Copyright 2016 nkk71 <nkk71x@gmail.com>
* Copyright 2016 topjohnwu <topjohnwu@gmail.com>
2017-08-14 19:25:54 +02:00
*
2017-04-14 00:06:41 +02:00
* Info:
2017-08-14 19:25:54 +02:00
*
2017-02-28 09:52:27 +01:00
* all changes are in
*
* bionic/libc/bionic/system_properties.cpp
*
* Functions that need to be patched/added in system_properties.cpp
*
* int __system_properties_init2()
2017-02-28 09:52:27 +01:00
* on android 7, first tear down the everything then let it initialize again:
* if (initialized) {
* //list_foreach(contexts, [](context_node* l) { l->reset_access(); });
* //return 0;
* free_and_unmap_contexts();
* initialized = false;
* }
*
*
* static prop_area* map_prop_area(const char* filename, bool is_legacy)
* we dont want this read only so change: 'O_RDONLY' to 'O_RDWR'
*
* static prop_area* map_fd_ro(const int fd)
* we dont want this read only so change: 'PROT_READ' to 'PROT_READ | PROT_WRITE'
2017-08-14 19:25:54 +02:00
*
2017-02-28 09:52:27 +01:00
*
* Copy the code of prop_info *prop_area::find_property, and modify to delete props
* const prop_info *prop_area::find_property_and_del(prop_bt *const trie, const char *name)
* {
2017-08-14 19:25:54 +02:00
* ...
2017-02-28 09:52:27 +01:00
* ... Do not alloc a new prop_bt here, remove all code involve alloc_if_needed
* ...
2017-08-14 19:25:54 +02:00
*
2017-02-28 09:52:27 +01:00
* if (prop_offset != 0) {
* atomic_store_explicit(&current->prop, 0, memory_order_release); // Add this line to nullify the prop entry
* return to_prop_info(&current->prop);
* } else {
2017-08-14 19:25:54 +02:00
*
2017-02-28 09:52:27 +01:00
* ....
* }
2017-08-14 19:25:54 +02:00
*
2017-02-28 09:52:27 +01:00
*
* by patching just those functions directly, all other functions should be ok
* as is.
*
*
*/
2017-04-14 00:06:41 +02:00
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
2017-10-09 20:04:50 +02:00
#include <dirent.h>
2017-04-14 00:06:41 +02:00
#include <sys/types.h>
#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
#include "_system_properties.h"
2017-07-13 17:42:01 +02:00
#include "system_properties.h"
2017-10-09 20:04:50 +02:00
2017-04-14 00:06:41 +02:00
#include "magisk.h"
2017-07-13 17:42:01 +02:00
#include "resetprop.h"
2017-10-09 20:04:50 +02:00
extern "C" {
#include "vector.h"
}
2017-04-27 19:45:57 +02:00
2017-10-09 20:04:50 +02:00
#define PRINT_D(...) { LOGD(__VA_ARGS__); if (verbose) fprintf(stderr, __VA_ARGS__); }
2017-04-27 19:45:57 +02:00
#define PRINT_E(...) { LOGE(__VA_ARGS__); fprintf(stderr, __VA_ARGS__); }
2017-07-18 05:56:57 +02:00
#define PERSISTENT_PROPERTY_DIR "/data/property"
2017-04-27 19:45:57 +02:00
2017-04-14 00:06:41 +02:00
static int verbose = 0;
2017-10-09 20:04:50 +02:00
static int 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 0;
illegal:
PRINT_E("Illegal property name: [%s]\n", name);
return 1;
2017-02-28 09:52:27 +01:00
}
2017-04-14 00:06:41 +02:00
static int usage(char* arg0) {
2017-10-09 20:04:50 +02:00
fprintf(stderr,
"resetprop v" xstr(MAGISK_VERSION) "(" xstr(MAGISK_VER_CODE) ") (by topjohnwu & nkk71) - System Props Modification Tool\n\n"
"Usage: %s [flags] [options...]\n"
"\n"
"Options:\n"
" -h, --help show this message\n"
" (no arguments) print all properties\n"
" NAME get property\n"
" NAME VALUE set property entry NAME with VALUE\n"
" --file FILE load props from FILE\n"
" --delete NAME delete property\n"
"\n"
"Flags:\n"
" -v print verbose output to stderr\n"
" -n set properties without init triggers\n"
" only affects setprop\n"
" -p access actual persist storage\n"
" only affects getprop and deleteprop\n"
"\n"
, arg0);
return 1;
2017-04-14 00:06:41 +02:00
}
2017-02-28 09:52:27 +01:00
2017-06-11 14:22:10 +02:00
static int init_resetprop() {
2017-10-09 20:04:50 +02:00
if (__system_properties_init2()) {
PRINT_E("resetprop: Initialize error\n");
return -1;
}
return 0;
2017-04-14 00:06:41 +02:00
}
2017-02-28 09:52:27 +01:00
2017-06-11 14:22:10 +02:00
int prop_exist(const char *name) {
2017-10-09 20:04:50 +02:00
if (init_resetprop()) return 0;
return __system_property_find2(name) != NULL;
2017-06-11 14:22:10 +02:00
}
2017-04-16 18:35:34 +02:00
static void read_prop_info(void* cookie, const char *name, const char *value, uint32_t serial) {
2017-10-09 20:04:50 +02:00
strcpy((char *) cookie, value);
2017-04-16 18:35:34 +02:00
}
2017-10-09 20:04:50 +02:00
2017-04-14 00:06:41 +02:00
char *getprop(const char *name) {
2017-10-09 20:04:50 +02:00
return getprop2(name, 0);
2017-04-14 00:06:41 +02:00
}
2017-02-28 09:52:27 +01:00
2017-10-09 20:04:50 +02:00
// Get prop by name, return string (should free manually!)
char *getprop2(const char *name, int persist) {
if (check_legal_property_name(name))
return NULL;
char value[PROP_VALUE_MAX];
if (init_resetprop()) return NULL;
const prop_info *pi = __system_property_find2(name);
if (pi == NULL) {
if (persist && strncmp(name, "persist.", 8) == 0) {
// Try to read from file
char path[PATH_MAX];
snprintf(path, sizeof(path), PERSISTENT_PROPERTY_DIR "/%s", name);
int fd = open(path, O_RDONLY | O_CLOEXEC);
if (fd < 0) goto no_prop;
PRINT_D("resetprop: read prop from [%s]\n", path);
size_t len = read(fd, value, sizeof(value));
value[len] = '\0'; // Null terminate the read value
} else {
no_prop:
PRINT_D("resetprop: prop [%s] does not exist\n", name);
return NULL;
}
} else {
__system_property_read_callback2(pi, read_prop_info, value);
}
PRINT_D("resetprop: getprop [%s]: [%s]\n", name, value);
return strdup(value);
}
2017-07-18 05:56:57 +02:00
2017-10-09 20:04:50 +02:00
struct wrapper {
void (*func)(const char *, const char *);
};
static void cb_wrapper(void* cookie, const char *name, const char *value, uint32_t serial) {
((wrapper *) cookie)->func(name, value);
2017-07-18 05:56:57 +02:00
}
static void prop_foreach_cb(const prop_info* pi, void* cookie) {
2017-10-09 20:04:50 +02:00
__system_property_read_callback2(pi, cb_wrapper, cookie);
}
class property {
public:
property(const char *n, const char *v) {
name = strdup(n);
value = strdup(v);
}
~property() {
free((void *)name);
free((void *)value);
}
const char *name;
const char *value;
};
vector prop_list;
static int prop_cmp(const void *p1, const void *p2) {
2017-12-20 20:36:18 +01:00
return strcmp(((property *) p1)->name, ((property *) p2)->name);
2017-10-09 20:04:50 +02:00
}
static void print_all_props_cb(const char *name, const char *value) {
vec_push_back(&prop_list, new property(name, value));
}
static void print_all_props(int persist) {
void *p;
vec_init(&prop_list);
getprop_all(print_all_props_cb);
if (persist) {
// Check all persist props in data
DIR *dir = opendir(PERSISTENT_PROPERTY_DIR);
struct dirent *entry;
while ((entry = readdir(dir))) {
if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0 )
continue;
int found = 0;
vec_for_each(&prop_list, p) {
if (strcmp(((property *) p)->name, entry->d_name) == 0) {
found = 1;
break;
}
}
if (!found)
vec_push_back(&prop_list, new property(entry->d_name, getprop2(entry->d_name, 1)));
}
}
vec_sort(&prop_list, prop_cmp);
vec_for_each(&prop_list, p) {
printf("[%s]: [%s]\n", ((property *) p)->name, ((property *) p)->value);
delete((property *) p);
}
vec_destroy(&prop_list);
2017-07-18 05:56:57 +02:00
}
2017-10-09 20:04:50 +02:00
void getprop_all(void (*callback)(const char*, const char*)) {
if (init_resetprop()) return;
struct wrapper wrap = {
.func = callback
};
__system_property_foreach2(prop_foreach_cb, &wrap);
2017-07-18 05:56:57 +02:00
}
2017-04-14 00:06:41 +02:00
int setprop(const char *name, const char *value) {
2017-10-09 20:04:50 +02:00
return setprop2(name, value, 1);
2017-04-14 00:06:41 +02:00
}
2017-02-28 09:52:27 +01:00
2017-04-30 19:58:52 +02:00
int setprop2(const char *name, const char *value, const int trigger) {
2017-10-09 20:04:50 +02:00
if (check_legal_property_name(name))
return 1;
if (init_resetprop()) return -1;
int ret;
prop_info *pi = (prop_info*) __system_property_find2(name);
if (pi != NULL) {
if (trigger) {
if (strncmp(name, "ro.", 3) == 0) deleteprop(name);
ret = __system_property_set2(name, value);
} else {
ret = __system_property_update2(pi, value, strlen(value));
}
} else {
PRINT_D("resetprop: New prop [%s]\n", name);
if (trigger) {
ret = __system_property_set2(name, value);
} else {
ret = __system_property_add2(name, strlen(name), value, strlen(value));
}
}
PRINT_D("resetprop: setprop [%s]: [%s] by %s\n", name, value,
trigger ? "property_service" : "modifing prop data structure");
if (ret)
PRINT_E("resetprop: setprop error\n");
return ret;
}
int deleteprop(const char *name) {
return deleteprop2(name, 1);
2017-04-14 00:06:41 +02:00
}
2017-10-09 20:04:50 +02:00
int deleteprop2(const char *name, const int persist) {
if (check_legal_property_name(name))
return 1;
if (init_resetprop()) return -1;
char path[PATH_MAX];
path[0] = '\0';
PRINT_D("resetprop: deleteprop [%s]\n", name);
if (persist && strncmp(name, "persist.", 8) == 0)
snprintf(path, sizeof(path), PERSISTENT_PROPERTY_DIR "/%s", name);
return __system_property_del(name) && unlink(path);
2017-02-28 09:52:27 +01:00
}
2017-04-30 19:58:52 +02:00
int read_prop_file(const char* filename, const int trigger) {
2017-10-09 20:04:50 +02:00
if (init_resetprop()) return -1;
PRINT_D("resetprop: Load prop file [%s]\n", filename);
FILE *fp = fopen(filename, "r");
if (fp == NULL) {
PRINT_E("Cannot open [%s]\n", filename);
return 1;
}
char *line = NULL, *pch;
size_t len;
ssize_t read;
int comment = 0, i;
while ((read = getline(&line, &len, fp)) != -1) {
// Remove the trailing newline
if (line[read - 1] == '\n') {
line[read - 1] = '\0';
--read;
}
comment = 0;
for (i = 0; i < read; ++i) {
// Ignore starting spaces
if (line[i] == ' ') continue;
else {
// A line starting with # is ignored
if (line[i] == '#') comment = 1;
break;
}
}
if (comment) continue;
pch = strchr(line, '=');
// Ignore ivalid formats
if ( ((pch == NULL) || (i >= (pch - line))) || (pch >= line + read - 1) ) continue;
// Separate the string
*pch = '\0';
setprop2(line + i, pch + 1, trigger);
}
free(line);
fclose(fp);
return 0;
2017-02-28 09:52:27 +01:00
}
int resetprop_main(int argc, char *argv[]) {
2017-10-09 20:04:50 +02:00
int trigger = 1, persist = 0;
char *argv0 = argv[0], *prop;
--argc;
++argv;
// Parse flags and -- options
while (argc && argv[0][0] == '-') {
for (int idx = 1; 1; ++idx) {
switch (argv[0][idx]) {
case '-':
if (strcmp(argv[0], "--file") == 0 && argc == 2) {
return read_prop_file(argv[1], trigger);
} else if (strcmp(argv[0], "--delete") == 0 && argc == 2) {
return deleteprop2(argv[1], persist);
} else if (strcmp(argv[0], "--help") == 0) {
goto usage;
}
case 'v':
verbose = 1;
continue;
case 'p':
persist = 1;
continue;
case 'n':
trigger = 0;
continue;
case '\0':
break;
case 'h':
default:
usage:
return usage(argv0);
}
break;
}
--argc;
++argv;
}
switch (argc) {
case 0:
print_all_props(persist);
return 0;
case 1:
prop = getprop2(argv[0], persist);
if (prop == NULL) return 1;
printf("%s\n", prop);
free(prop);
return 0;
case 2:
return setprop2(argv[0], argv[1], trigger);
default:
usage(argv0);
return 1;
}
2017-02-28 09:52:27 +01:00
}