forked from MarcoBuster/Magisk
292 lines
8.3 KiB
C++
292 lines
8.3 KiB
C++
/* 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 <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 <sys/system_properties.h>
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#ifdef INDEP_BINARY
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int resetprop_main(int argc, char *argv[]);
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int main(int argc, char *argv[]) {
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return resetprop_main(argc, argv);
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}
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#define PRINT_D(...) if (verbose) printf(__VA_ARGS__)
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#define PRINT_E(...) fprintf(stderr, __VA_ARGS__)
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#else
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#include "magisk.h"
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#define PRINT_D(...) { LOGD(__VA_ARGS__); if (verbose) printf(__VA_ARGS__); }
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#define PRINT_E(...) { LOGE(__VA_ARGS__); fprintf(stderr, __VA_ARGS__); }
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#endif
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#include "resetprop.h"
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static int verbose = 0;
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static bool is_legal_property_name(const char* name, size_t namelen) {
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if (namelen < 1) return false;
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if (name[0] == '.') return false;
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if (name[namelen - 1] == '.') return false;
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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] == '.') return false;
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continue;
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}
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if (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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return false;
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}
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return true;
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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) " (by topjohnwu & nkk71) - System Props Modification Tool\n\n"
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"Usage: %s [options] [args...]\n"
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"%s <name> <value>: Set property entry <name> with <value>\n"
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"%s --file <prop file>: Load props from <prop file>\n"
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"%s --delete <name>: Remove prop entry <name>\n"
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"\n"
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"Options:\n"
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" -v verbose output\n"
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" -n don't trigger events when changing props\n"
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, arg0, arg0, arg0, arg0);
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return 1;
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}
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int init_resetprop() {
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PRINT_D("resetprop: Initializing...\n");
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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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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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// Get prop by name, return string (should free manually!)
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char *getprop(const char *name) {
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const prop_info *pi = __system_property_find2(name);
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if (pi == NULL) {
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PRINT_D("resetprop: failed to get [%s]\n", name);
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return NULL;
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}
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char value[PROP_VALUE_MAX];
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__system_property_read_callback2(pi, read_prop_info, value);
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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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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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int ret;
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char *check = getprop(name);
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if (check) {
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free(check);
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if (trigger) {
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if (!strncmp(name, "ro.", 3)) 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((prop_info*) __system_property_find2(name), 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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PRINT_D("resetprop: deleteprop [%s]\n", name);
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if (__system_property_del(name)) {
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PRINT_E("resetprop: delete prop: [%s] error\n", name);
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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 read_prop_file(const char* filename, const int trigger) {
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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 del = 0, file = 0, trigger = 1;
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int exp_arg = 2;
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char *name, *value, *filename;
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if (argc < 3) {
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return usage(argv[0]);
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}
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for (int i = 1; i < argc; ++i) {
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if (!strcmp("-v", argv[i])) {
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verbose = 1;
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} else if (!strcmp("-n", argv[i])) {
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trigger = 0;
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} else if (!strcmp("--file", argv[i])) {
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file = 1;
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exp_arg = 1;
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} else if (!strcmp("--delete", argv[i])) {
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del = 1;
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exp_arg = 1;
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} else {
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if (i + exp_arg > argc) {
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return usage(argv[0]);
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}
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if (file) {
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filename = argv[i];
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break;
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} else {
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if(!is_legal_property_name(argv[i], strlen(argv[i]))) {
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PRINT_E("Illegal property name: [%s]\n", argv[i]);
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return 1;
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}
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name = argv[i];
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if (exp_arg > 1) {
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if (strlen(argv[i + 1]) >= PROP_VALUE_MAX) {
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PRINT_E("Value too long: [%s]\n", argv[i + 1]);
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return 1;
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}
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value = argv[i + 1];
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}
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break;
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}
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}
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}
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init_resetprop();
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if (file) {
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return read_prop_file(filename, trigger);
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} else if (del) {
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return deleteprop(name);
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} else {
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return setprop2(name, value, trigger);
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}
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return 0;
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}
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