mirror of
https://github.com/topjohnwu/Magisk.git
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281 lines
8.3 KiB
C++
281 lines
8.3 KiB
C++
/*
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*
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* resetprop.cpp
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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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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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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 <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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/* 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_init()
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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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int verbose = 0, del = 0, file = 0, trigger = 1;
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static bool is_legal_property_name(const char* name, size_t namelen)
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{
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size_t i;
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if (namelen >= PROP_NAME_MAX) return false;
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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 (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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int x_property_set(const char *name, const char *value)
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{
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int ret;
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char value_read[PROP_VALUE_MAX];
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size_t namelen = strlen(name);
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size_t valuelen = strlen(value);
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if (trigger) {
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printf("Set with property_service: '%s'='%s'\n", name, value);
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} else {
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printf("Modify data structure: '%s'='%s'\n", name, value);
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}
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__system_property_get(name, value_read);
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if(strlen(value_read)) {
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printf("Existing property: '%s'='%s'\n", name, value_read);
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if (trigger) {
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if (!strncmp(name, "ro.", 3)) __system_property_del(name); // Only delete ro props
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ret = __system_property_set(name, value);
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} else {
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ret = __system_property_update((prop_info*) __system_property_find(name), value, valuelen);
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}
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} else {
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if (trigger) {
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ret = __system_property_set(name, value);
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} else {
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ret = __system_property_add(name, namelen, value, valuelen);
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}
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}
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if (ret != 0) {
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fprintf(stderr, "Failed to set '%s'='%s'\n", name, value);
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return ret;
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}
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__system_property_get(name, value_read);
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printf("Recheck property: '%s'='%s'\n", name, value_read);
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return 0;
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}
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int read_prop_file(const char* filename) {
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printf(" Attempting to read props from \'%s\'\n", filename);
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FILE *fp = fopen(filename, "r");
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if (fp == NULL) {
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fprintf(stderr, "Cannot open \'%s\'\n", filename);
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return 1;
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}
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char *line = NULL, *pch, name[PROP_NAME_MAX], value[PROP_VALUE_MAX];
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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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x_property_set(line + i, pch + 1);
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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 usage(char* name) {
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fprintf(stderr, "usage: %s [-v] [-n] [--file propfile] [--delete name] [ name value ] \n", name);
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fprintf(stderr, " -v :\n");
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fprintf(stderr, " verbose output (Default: Disabled)\n");
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fprintf(stderr, " -n :\n");
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fprintf(stderr, " no event triggers when changing props (Default: Will trigger events)\n");
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fprintf(stderr, " --file propfile :\n");
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fprintf(stderr, " Read props from prop files (e.g. build.prop)\n");
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fprintf(stderr, " --delete name :\n");
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fprintf(stderr, " Remove a prop entry\n\n");
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return 1;
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}
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int main(int argc, char *argv[])
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{
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int exp_arg = 2, stdout_bak, null;
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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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fprintf(stderr, "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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fprintf(stderr, "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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if (!verbose) {
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fflush(stdout);
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stdout_bak = dup(1);
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null = open("/dev/null", O_WRONLY);
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dup2(null, 1);
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}
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printf("resetprop by nkk71 & topjohnwu\n");
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printf("Initializing...\n");
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if (__system_properties_init()) {
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fprintf(stderr, "Error during init\n");
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return 1;
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}
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if (file) {
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if (read_prop_file(filename)) return 1;
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} else if (del) {
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printf("Attempting to delete '%s'\n", name);
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if (__system_property_del(name)) return 1;
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} else {
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if(x_property_set(name, value)) return 1;
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}
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printf("Done!\n\n");
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return 0;
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}
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