Magisk/native/jni/resetprop/persist_properties.cpp

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#include <stdbool.h>
#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>
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#include <vector>
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#include <pb.h>
#include <pb_decode.h>
#include <pb_encode.h>
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#include <utils.h>
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#include "private/resetprop.h"
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using namespace std;
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/* ***********************************************************************
* Auto generated header and constant definitions compiled from
* android/platform/system/core/master/init/persistent_properties.proto
* using Nanopb's protoc
* Nanopb: https://github.com/nanopb/nanopb
* ***********************************************************************/
/* Automatically generated nanopb header */
/* Generated by nanopb-0.3.9.1 at Sun Apr 22 14:36:22 2018. */
/* @@protoc_insertion_point(includes) */
#if PB_PROTO_HEADER_VERSION != 30
#error Regenerate this file with the current version of nanopb generator.
#endif
/* Struct definitions */
typedef struct _PersistentProperties {
pb_callback_t properties;
/* @@protoc_insertion_point(struct:PersistentProperties) */
} PersistentProperties;
typedef struct _PersistentProperties_PersistentPropertyRecord {
pb_callback_t name;
bool has_value;
char value[92];
/* @@protoc_insertion_point(struct:PersistentProperties_PersistentPropertyRecord) */
} PersistentProperties_PersistentPropertyRecord;
/* Default values for struct fields */
/* Initializer values for message structs */
#define PersistentProperties_init_default {{{NULL}, NULL}}
#define PersistentProperties_PersistentPropertyRecord_init_default {{{NULL}, NULL}, false, ""}
#define PersistentProperties_init_zero {{{NULL}, NULL}}
#define PersistentProperties_PersistentPropertyRecord_init_zero {{{NULL}, NULL}, false, ""}
/* Field tags (for use in manual encoding/decoding) */
#define PersistentProperties_properties_tag 1
#define PersistentProperties_PersistentPropertyRecord_name_tag 1
#define PersistentProperties_PersistentPropertyRecord_value_tag 2
/* Automatically generated nanopb constant definitions */
/* Generated by nanopb-0.3.9.1 at Sun Apr 22 14:36:22 2018. */
/* Struct field encoding specification for nanopb */
const pb_field_t PersistentProperties_PersistentPropertyRecord_fields[3] = {
PB_FIELD( 1, STRING , OPTIONAL, CALLBACK, FIRST, PersistentProperties_PersistentPropertyRecord, name, name, 0),
PB_FIELD( 2, STRING , OPTIONAL, STATIC , OTHER, PersistentProperties_PersistentPropertyRecord, value, name, 0),
PB_LAST_FIELD
};
const pb_field_t PersistentProperties_fields[2] = {
PB_FIELD( 1, MESSAGE , REPEATED, CALLBACK, FIRST, PersistentProperties, properties, properties, &PersistentProperties_PersistentPropertyRecord_fields),
PB_LAST_FIELD
};
/* Maximum encoded size of messages (where known) */
/* PersistentProperties_size depends on runtime parameters */
/* PersistentProperties_PersistentPropertyRecord_size depends on runtime parameters */
/* Message IDs (where set with "msgid" option) */
#ifdef PB_MSGID
#define PROPS_MESSAGES \
#endif
/* @@protoc_insertion_point(eof) */
/* ***************************
* End of auto generated code
* ***************************/
static bool name_decode(pb_istream_t *stream, const pb_field_t *field, void **arg) {
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auto name = new pb_byte_t[stream->bytes_left + 1];
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name[stream->bytes_left] = '\0';
if (!pb_read(stream, name, stream->bytes_left))
return false;
*arg = name;
return true;
}
static bool name_encode(pb_ostream_t *stream, const pb_field_t *field, void * const *arg) {
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return pb_encode_tag_for_field(stream, field) &&
pb_encode_string(stream, (const pb_byte_t *) *arg, strlen((const char *) *arg));
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}
static bool prop_decode(pb_istream_t *stream, const pb_field_t *field, void **arg) {
PersistentProperties_PersistentPropertyRecord prop = {};
prop.name.funcs.decode = name_decode;
if (!pb_decode(stream, PersistentProperties_PersistentPropertyRecord_fields, &prop))
return false;
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((read_cb_t *) *arg)->exec((const char *) prop.name.arg, prop.value);
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delete[] (pb_byte_t *) prop.name.arg;
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return true;
}
static bool prop_encode(pb_ostream_t *stream, const pb_field_t *field, void * const *arg) {
PersistentProperties_PersistentPropertyRecord prop = {};
prop.name.funcs.encode = name_encode;
prop.has_value = true;
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auto &prop_list = *(vector<prop_t> *) *arg;
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for (auto &p : prop_list) {
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if (!pb_encode_tag_for_field(stream, field))
return false;
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prop.name.arg = p.name;
strcpy(prop.value, p.value);
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if (!pb_encode_submessage(stream, PersistentProperties_PersistentPropertyRecord_fields, &prop))
return false;
}
return true;
}
static bool write_callback(pb_ostream_t *stream, const uint8_t *buf, size_t count) {
int fd = (intptr_t)stream->state;
return xwrite(fd, buf, count) == count;
}
static pb_ostream_t create_ostream(const char *filename) {
int fd = creat(filename, 0644);
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pb_ostream_t o = {
.callback = write_callback,
.state = (void*)(intptr_t)fd,
.max_size = SIZE_MAX,
.bytes_written = 0,
};
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return o;
}
static void pb_getprop_cb(const char *name, const char *value, void *v) {
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struct prop_t *prop = static_cast<prop_t *>(v);
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if (prop->name && strcmp(name, prop->name) == 0)
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strcpy(prop->value, value);
}
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static void pb_getprop(read_cb_t *read_cb) {
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LOGD("resetprop: decode with protobuf [" PERSISTENT_PROPERTY_DIR "/persistent_properties]\n");
PersistentProperties props = {};
props.properties.funcs.decode = prop_decode;
props.properties.arg = read_cb;
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pb_byte_t *buf;
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size_t size;
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mmap_ro(PERSISTENT_PROPERTY_DIR "/persistent_properties", buf, size);
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pb_istream_t stream = pb_istream_from_buffer(buf, size);
pb_decode(&stream, PersistentProperties_fields, &props);
munmap(buf, size);
}
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static bool file_getprop(const char *name, char *value) {
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char path[PATH_MAX];
snprintf(path, sizeof(path), PERSISTENT_PROPERTY_DIR "/%s", name);
int fd = open(path, O_RDONLY | O_CLOEXEC);
if (fd < 0)
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return false;
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LOGD("resetprop: read prop from [%s]\n", path);
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value[read(fd, value, PROP_VALUE_MAX)] = '\0'; // Null terminate the read value
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close(fd);
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return value[0] != '\0';
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}
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void persist_getprop(read_cb_t *read_cb) {
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if (use_pb) {
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pb_getprop(read_cb);
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} else {
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;
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char value[PROP_VALUE_MAX];
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if (file_getprop(entry->d_name, value))
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read_cb->exec(entry->d_name, value);
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}
}
}
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string persist_getprop(const char *name) {
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prop_t prop(name);
if (use_pb) {
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read_cb_t read_cb(pb_getprop_cb, &prop);
pb_getprop(&read_cb);
if (prop.value[0])
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return prop.value;
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} else {
// Try to read from file
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char value[PROP_VALUE_MAX];
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if (file_getprop(name, value))
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return value;
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}
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return string();
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}
bool persist_deleteprop(const char *name) {
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if (use_pb) {
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vector<prop_t> prop_list;
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read_cb_t read_cb(collect_props, &prop_list);
persist_getprop(&read_cb);
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for (auto it = prop_list.begin(); it != prop_list.end(); ++it) {
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if (strcmp(it->name, name) == 0) {
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prop_list.erase(it);
// Dump the props back
PersistentProperties props = PersistentProperties_init_zero;
pb_ostream_t ostream = create_ostream(PERSISTENT_PROPERTY_DIR
"/persistent_properties.tmp");
props.properties.funcs.encode = prop_encode;
props.properties.arg = &prop_list;
LOGD("resetprop: encode with protobuf [" PERSISTENT_PROPERTY_DIR
"/persistent_properties.tmp]\n");
if (!pb_encode(&ostream, PersistentProperties_fields, &props))
return false;
clone_attr(PERSISTENT_PROPERTY_DIR "/persistent_properties",
PERSISTENT_PROPERTY_DIR "/persistent_properties.tmp");
rename(PERSISTENT_PROPERTY_DIR "/persistent_properties.tmp",
PERSISTENT_PROPERTY_DIR "/persistent_properties");
return true;
}
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}
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return false;
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} else {
char path[PATH_MAX];
snprintf(path, sizeof(path), PERSISTENT_PROPERTY_DIR "/%s", name);
if (unlink(path) == 0) {
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LOGD("resetprop: unlink [%s]\n", path);
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return true;
}
}
return false;
}