mirror of
https://github.com/topjohnwu/Magisk.git
synced 2025-06-12 13:17:39 +02:00
Rename module core to native
This commit is contained in:
topjohnwu
407
native/jni/resetprop/resetprop.cpp
Normal file
407
native/jni/resetprop/resetprop.cpp
Normal file
@ -0,0 +1,407 @@
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/* resetprop.cpp - Manipulate any system props
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*
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* Copyright 2016 nkk71 <nkk71x@gmail.com>
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* Copyright 2016 topjohnwu <topjohnwu@gmail.com>
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*
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* Info:
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*
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* all changes are in
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*
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* bionic/libc/bionic/system_properties.cpp
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*
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* Functions that need to be patched/added in system_properties.cpp
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*
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* int __system_properties_init2()
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* on android 7, first tear down the everything then let it initialize again:
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* if (initialized) {
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* //list_foreach(contexts, [](context_node* l) { l->reset_access(); });
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* //return 0;
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* free_and_unmap_contexts();
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* initialized = false;
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* }
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*
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*
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* static prop_area* map_prop_area(const char* filename, bool is_legacy)
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* we dont want this read only so change: 'O_RDONLY' to 'O_RDWR'
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*
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* static prop_area* map_fd_ro(const int fd)
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* we dont want this read only so change: 'PROT_READ' to 'PROT_READ | PROT_WRITE'
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*
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*
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* Copy the code of prop_info *prop_area::find_property, and modify to delete props
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* const prop_info *prop_area::find_property_and_del(prop_bt *const trie, const char *name)
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* {
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* ...
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* ... Do not alloc a new prop_bt here, remove all code involve alloc_if_needed
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* ...
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*
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* if (prop_offset != 0) {
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* atomic_store_explicit(¤t->prop, 0, memory_order_release); // Add this line to nullify the prop entry
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* return to_prop_info(¤t->prop);
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* } else {
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*
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* ....
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* }
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*
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*
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* by patching just those functions directly, all other functions should be ok
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* as is.
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*
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*
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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#include <dirent.h>
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#include <sys/types.h>
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#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
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#include "_system_properties.h"
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#include "system_properties.h"
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#include "magisk.h"
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#include "resetprop.h"
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extern "C" {
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#include "vector.h"
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}
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#define PRINT_D(...) { LOGD(__VA_ARGS__); if (verbose) fprintf(stderr, __VA_ARGS__); }
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#define PRINT_E(...) { LOGE(__VA_ARGS__); fprintf(stderr, __VA_ARGS__); }
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#define PERSISTENT_PROPERTY_DIR "/data/property"
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static int verbose = 0;
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static int check_legal_property_name(const char *name) {
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int namelen = strlen(name);
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if (namelen < 1) goto illegal;
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if (name[0] == '.') goto illegal;
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if (name[namelen - 1] == '.') goto illegal;
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/* Only allow alphanumeric, plus '.', '-', '@', ':', or '_' */
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/* Don't allow ".." to appear in a property name */
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for (size_t i = 0; i < namelen; i++) {
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if (name[i] == '.') {
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// i=0 is guaranteed to never have a dot. See above.
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if (name[i-1] == '.') goto illegal;
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continue;
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}
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if (name[i] == '_' || name[i] == '-' || name[i] == '@' || name[i] == ':') continue;
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if (name[i] >= 'a' && name[i] <= 'z') continue;
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if (name[i] >= 'A' && name[i] <= 'Z') continue;
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if (name[i] >= '0' && name[i] <= '9') continue;
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goto illegal;
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}
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return 0;
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illegal:
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PRINT_E("Illegal property name: [%s]\n", name);
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return 1;
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}
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static int usage(char* arg0) {
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fprintf(stderr,
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"resetprop v" xstr(MAGISK_VERSION) "(" xstr(MAGISK_VER_CODE) ") (by topjohnwu & nkk71) - System Props Modification Tool\n\n"
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"Usage: %s [flags] [options...]\n"
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"\n"
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"Options:\n"
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" -h, --help show this message\n"
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" (no arguments) print all properties\n"
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" NAME get property\n"
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" NAME VALUE set property entry NAME with VALUE\n"
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" --file FILE load props from FILE\n"
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" --delete NAME delete property\n"
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"\n"
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"Flags:\n"
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" -v print verbose output to stderr\n"
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" -n set properties without init triggers\n"
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" only affects setprop\n"
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" -p access actual persist storage\n"
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" only affects getprop and deleteprop\n"
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"\n"
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, arg0);
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return 1;
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}
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static int init_resetprop() {
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if (__system_properties_init2()) {
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PRINT_E("resetprop: Initialize error\n");
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return -1;
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}
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return 0;
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}
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int prop_exist(const char *name) {
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if (init_resetprop()) return 0;
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return __system_property_find2(name) != NULL;
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}
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static void read_prop_info(void* cookie, const char *name, const char *value, uint32_t serial) {
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strcpy((char *) cookie, value);
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}
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char *getprop(const char *name) {
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return getprop2(name, 0);
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}
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// Get prop by name, return string (should free manually!)
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char *getprop2(const char *name, int persist) {
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if (check_legal_property_name(name))
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return NULL;
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char value[PROP_VALUE_MAX];
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if (init_resetprop()) return NULL;
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const prop_info *pi = __system_property_find2(name);
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if (pi == NULL) {
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if (persist && strncmp(name, "persist.", 8) == 0) {
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// Try to read from file
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char path[PATH_MAX];
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snprintf(path, sizeof(path), PERSISTENT_PROPERTY_DIR "/%s", name);
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int fd = open(path, O_RDONLY | O_CLOEXEC);
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if (fd < 0) goto no_prop;
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PRINT_D("resetprop: read prop from [%s]\n", path);
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size_t len = read(fd, value, sizeof(value));
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value[len] = '\0'; // Null terminate the read value
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} else {
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no_prop:
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PRINT_D("resetprop: prop [%s] does not exist\n", name);
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return NULL;
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}
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} else {
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__system_property_read_callback2(pi, read_prop_info, value);
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}
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PRINT_D("resetprop: getprop [%s]: [%s]\n", name, value);
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return strdup(value);
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}
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struct wrapper {
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void (*func)(const char *, const char *);
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};
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static void cb_wrapper(void* cookie, const char *name, const char *value, uint32_t serial) {
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((wrapper *) cookie)->func(name, value);
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}
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static void prop_foreach_cb(const prop_info* pi, void* cookie) {
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__system_property_read_callback2(pi, cb_wrapper, cookie);
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}
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class property {
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public:
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property(const char *n, const char *v) {
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name = strdup(n);
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value = strdup(v);
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}
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~property() {
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free((void *)name);
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free((void *)value);
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}
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const char *name;
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const char *value;
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};
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vector prop_list;
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static int prop_cmp(const void *p1, const void *p2) {
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return strcmp(((property *) p1)->name, ((property *) p2)->name);
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}
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static void print_all_props_cb(const char *name, const char *value) {
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vec_push_back(&prop_list, new property(name, value));
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}
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static void print_all_props(int persist) {
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void *p;
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vec_init(&prop_list);
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getprop_all(print_all_props_cb);
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if (persist) {
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// Check all persist props in data
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DIR *dir = opendir(PERSISTENT_PROPERTY_DIR);
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struct dirent *entry;
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while ((entry = readdir(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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int found = 0;
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vec_for_each(&prop_list, p) {
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if (strcmp(((property *) p)->name, entry->d_name) == 0) {
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found = 1;
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break;
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}
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}
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if (!found)
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vec_push_back(&prop_list, new property(entry->d_name, getprop2(entry->d_name, 1)));
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}
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}
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vec_sort(&prop_list, prop_cmp);
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vec_for_each(&prop_list, p) {
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printf("[%s]: [%s]\n", ((property *) p)->name, ((property *) p)->value);
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delete((property *) p);
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}
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vec_destroy(&prop_list);
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}
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void getprop_all(void (*callback)(const char*, const char*)) {
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if (init_resetprop()) return;
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struct wrapper wrap = {
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.func = callback
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};
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__system_property_foreach2(prop_foreach_cb, &wrap);
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}
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int setprop(const char *name, const char *value) {
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return setprop2(name, value, 1);
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}
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int setprop2(const char *name, const char *value, const int trigger) {
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if (check_legal_property_name(name))
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return 1;
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if (init_resetprop()) return -1;
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int ret;
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prop_info *pi = (prop_info*) __system_property_find2(name);
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if (pi != NULL) {
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if (trigger) {
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if (strncmp(name, "ro.", 3) == 0) deleteprop(name);
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ret = __system_property_set2(name, value);
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} else {
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ret = __system_property_update2(pi, value, strlen(value));
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}
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} else {
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PRINT_D("resetprop: New prop [%s]\n", name);
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if (trigger) {
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ret = __system_property_set2(name, value);
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} else {
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ret = __system_property_add2(name, strlen(name), value, strlen(value));
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}
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}
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PRINT_D("resetprop: setprop [%s]: [%s] by %s\n", name, value,
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trigger ? "property_service" : "modifing prop data structure");
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if (ret)
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PRINT_E("resetprop: setprop error\n");
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return ret;
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}
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int deleteprop(const char *name) {
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return deleteprop2(name, 1);
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}
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int deleteprop2(const char *name, const int persist) {
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if (check_legal_property_name(name))
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return 1;
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if (init_resetprop()) return -1;
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char path[PATH_MAX];
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path[0] = '\0';
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PRINT_D("resetprop: deleteprop [%s]\n", name);
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if (persist && strncmp(name, "persist.", 8) == 0)
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snprintf(path, sizeof(path), PERSISTENT_PROPERTY_DIR "/%s", name);
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return __system_property_del(name) && unlink(path);
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}
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int read_prop_file(const char* filename, const int trigger) {
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if (init_resetprop()) return -1;
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PRINT_D("resetprop: Load prop file [%s]\n", filename);
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FILE *fp = fopen(filename, "r");
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if (fp == NULL) {
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PRINT_E("Cannot open [%s]\n", filename);
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return 1;
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}
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char *line = NULL, *pch;
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size_t len;
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ssize_t read;
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int comment = 0, i;
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while ((read = getline(&line, &len, fp)) != -1) {
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// Remove the trailing newline
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if (line[read - 1] == '\n') {
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line[read - 1] = '\0';
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--read;
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}
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comment = 0;
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for (i = 0; i < read; ++i) {
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// Ignore starting spaces
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if (line[i] == ' ') continue;
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else {
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// A line starting with # is ignored
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if (line[i] == '#') comment = 1;
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break;
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}
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}
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if (comment) continue;
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pch = strchr(line, '=');
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// Ignore ivalid formats
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if ( ((pch == NULL) || (i >= (pch - line))) || (pch >= line + read - 1) ) continue;
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// Separate the string
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*pch = '\0';
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setprop2(line + i, pch + 1, trigger);
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}
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free(line);
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fclose(fp);
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return 0;
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}
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int resetprop_main(int argc, char *argv[]) {
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int trigger = 1, persist = 0;
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char *argv0 = argv[0], *prop;
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--argc;
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++argv;
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// Parse flags and -- options
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while (argc && argv[0][0] == '-') {
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for (int idx = 1; 1; ++idx) {
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switch (argv[0][idx]) {
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case '-':
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if (strcmp(argv[0], "--file") == 0 && argc == 2) {
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return read_prop_file(argv[1], trigger);
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} else if (strcmp(argv[0], "--delete") == 0 && argc == 2) {
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return deleteprop2(argv[1], persist);
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} else if (strcmp(argv[0], "--help") == 0) {
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goto usage;
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}
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case 'v':
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verbose = 1;
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continue;
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case 'p':
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persist = 1;
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continue;
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case 'n':
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trigger = 0;
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continue;
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case '\0':
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break;
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case 'h':
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default:
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usage:
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return usage(argv0);
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}
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break;
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}
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--argc;
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++argv;
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}
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switch (argc) {
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case 0:
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print_all_props(persist);
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return 0;
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case 1:
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prop = getprop2(argv[0], persist);
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if (prop == NULL) return 1;
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printf("%s\n", prop);
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free(prop);
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return 0;
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case 2:
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return setprop2(argv[0], argv[1], trigger);
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default:
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usage(argv0);
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return 1;
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}
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}
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Block a user