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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <frameworks/base/core/proto/android/os/incident.pb.h>
#include <map>
#include <set>
#include <sstream>
#include <string>
#ifndef FALLTHROUGH_INTENDED
#define FALLTHROUGH_INTENDED [[fallthrough]]
#endif
using namespace android;
using namespace android::os;
using namespace google::protobuf;
using namespace google::protobuf::io;
using namespace google::protobuf::internal;
using namespace std;
/**
* Implementation details:
* This binary auto generates .cpp files for incident and incidentd.
*
* When argument "incident" is specified, it generates incident_section.cpp file.
*
* When argument "incidentd" is specified, it generates section_list.cpp file.
*
* In section_list.cpp file, it generates a SECTION_LIST array and a PRIVACY_POLICY_LIST array.
* For SECTION_LIST, it generates Section.h classes only for proto fields with section option enabled.
* For PRIVACY_POLICY_LIST, it generates Privacy.h classes only for proto fields with privacy option enabled.
*
* For Privacy struct, it is possible to have self recursion definitions since protobuf is defining "classes"
* So the logic to handle it becomes very complicated when Privacy tag of a message contains a list of Privacies
* of its sub-messages. The code also handles multiple depth of self recursion fields.
*
* For example here is a one level self recursion message WindowManager:
* message WindowState {
* string state = 1 [(privacy).dest = LOCAL];
* int32 display_id = 2;
* repeated WindowState child_windows = 3;
* }
*
* message WindowManager {
* WindowState my_window = 1;
* }
*
* When generating Privacy options for WindowManager, this tool will generate cpp syntax source code:
*
* #include "section_list.h"
* ...
* Privacy WindowState__state { 1, 9, NULL, LOCAL, NULL }; // first two integers are values for field id and proto type.
* Privacy WindowState__child_windows { 3, 11, NULL, UNSET, NULL }; // reserved for WindowState_LIST
* Privacy* WindowState__MSG__UNSET[] = {
* &WindowState_state,
* // display id is default, nothing is generated.
* &WindowState_child_windows,
* NULL // terminator of the array
* };
* Privacy WindowState__my_window { 1, 11, WindowState__MSG__UNSET, UNSET, NULL };
*
* createList() {
* ...
* WindowState_child_windows.children = WindowState__MSG_UNSET; // point to its own definition after the list is defined.
* ...
* }
*
* const Privacy** PRIVACY_POLICY_LIST = createList();
* const int PRIVACY_POLICY_COUNT = 1;
*
* Privacy Value Inheritance rules:
* 1. Both field and message can be tagged with DESTINATION: LOCAL(L), EXPLICIT(E), AUTOMATIC(A).
* 2. Primitives inherits containing message's tag unless defined explicitly.
* 3. Containing message's tag doesn't apply to message fields, even when unset (in this case, uses its default message tag).
* 4. Message field tag overrides its default message tag.
* 5. UNSET tag defaults to EXPLICIT.
*/
// The assignments will be called when constructs PRIVACY_POLICY_LIST, has to be global variable
vector<string> gSelfRecursionAssignments;
static inline void emptyline() {
printf("\n");
}
static void generateHead(const char* header) {
printf("// Auto generated file. Do not modify\n");
emptyline();
printf("#include \"%s.h\"\n", header);
emptyline();
}
// ======================== incident_sections =============================
static bool generateIncidentSectionsCpp(Descriptor const* descriptor)
{
generateHead("incident_sections");
map<string,FieldDescriptor const*> sections;
int N;
N = descriptor->field_count();
for (int i=0; i<N; i++) {
const FieldDescriptor* field = descriptor->field(i);
sections[field->name()] = field;
}
printf("IncidentSection const INCIDENT_SECTIONS[] = {\n");
N = sections.size();
int i = 0;
for (map<string,FieldDescriptor const*>::const_iterator it = sections.begin();
it != sections.end(); it++, i++) {
const FieldDescriptor* field = it->second;
printf(" { %d, \"%s\" }", field->number(), field->name().c_str());
if (i != N-1) {
printf(",\n");
} else {
printf("\n");
}
}
printf("};\n");
printf("const int INCIDENT_SECTION_COUNT = %d;\n", N);
return true;
}
// ========================= section_list ===================================
static void splitAndPrint(const string& args) {
size_t base = 0;
size_t found;
while (true) {
found = args.find_first_of(' ', base);
if (found != base) {
string arg = args.substr(base, found - base);
printf(" \"%s\",", arg.c_str());
}
if (found == args.npos) break;
base = found + 1;
}
}
static string replaceAll(const string& fieldName, const char oldC, const string& newS) {
if (fieldName.find_first_of(oldC) == fieldName.npos) return fieldName.c_str();
size_t pos = 0, idx = 0;
char* res = new char[fieldName.size() * newS.size() + 1]; // assign a larger buffer
while (pos != fieldName.size()) {
char cur = fieldName[pos++];
if (cur != oldC) {
res[idx++] = cur;
continue;
}
for (size_t i=0; i<newS.size(); i++) {
res[idx++] = newS[i];
}
}
res[idx] = '\0';
string result(res);
delete [] res;
return result;
}
static inline void printPrivacy(const string& name, const FieldDescriptor* field, const string& children,
const Destination dest, const string& patterns, const string& comments = "") {
printf("Privacy %s = { %d, %d, %s, %d, %s };%s\n", name.c_str(), field->number(), field->type(),
children.c_str(), dest, patterns.c_str(), comments.c_str());
}
// Get Custom Options ================================================================================
static inline SectionFlags getSectionFlags(const FieldDescriptor* field) {
return field->options().GetExtension(section);
}
static inline PrivacyFlags getPrivacyFlags(const FieldDescriptor* field) {
return field->options().GetExtension(privacy);
}
static inline PrivacyFlags getPrivacyFlags(const Descriptor* descriptor) {
return descriptor->options().GetExtension(msg_privacy);
}
// Get Destinations ===================================================================================
static inline Destination getMessageDest(const Descriptor* descriptor, const Destination overridden) {
return overridden != DEST_UNSET ? overridden : getPrivacyFlags(descriptor).dest();
}
// Returns field's own dest, when it is a message field, uses its message default tag if unset.
static inline Destination getFieldDest(const FieldDescriptor* field) {
Destination fieldDest = getPrivacyFlags(field).dest();
return field->type() != FieldDescriptor::TYPE_MESSAGE ? fieldDest :
getMessageDest(field->message_type(), fieldDest);
}
// Converts Destination to a string.
static inline string getDestString(const Destination dest) {
switch (dest) {
case DEST_AUTOMATIC: return "AUTOMATIC";
case DEST_LOCAL: return "LOCAL";
case DEST_EXPLICIT: return "EXPLICIT";
// UNSET is considered EXPLICIT by default.
case DEST_UNSET: return "EXPLICIT";
default: return "UNKNOWN";
}
}
// Get Names ===========================================================================================
static inline string getFieldName(const FieldDescriptor* field) {
// replace . with double underscores to avoid name conflicts since fields use snake naming convention
return replaceAll(field->full_name(), '.', "__");
}
static inline string getMessageName(const Descriptor* descriptor, const Destination overridden) {
// replace . with one underscore since messages use camel naming convention
return replaceAll(descriptor->full_name(), '.', "_") + "__MSG__" +
to_string(getMessageDest(descriptor, overridden));
}
// IsDefault ============================================================================================
// Returns true if a field is default. Default is defined as this field has same dest as its containing message.
// For message fields, it only looks at its field tag and own default message tag, doesn't recursively go deeper.
static inline bool isDefaultField(const FieldDescriptor* field, const Destination containerDest) {
Destination fieldDest = getFieldDest(field);
if (field->type() != FieldDescriptor::TYPE_MESSAGE) {
return fieldDest == containerDest || (fieldDest == DEST_UNSET);
} else {
return fieldDest == containerDest ||
(containerDest == DEST_UNSET && fieldDest == DEST_EXPLICIT) ||
(containerDest == DEST_EXPLICIT && fieldDest == DEST_UNSET);
}
}
static bool isDefaultMessageImpl(const Descriptor* descriptor, const Destination dest, set<string>* parents) {
const int N = descriptor->field_count();
const Destination messageDest = getMessageDest(descriptor, dest);
parents->insert(descriptor->full_name());
for (int i=0; i<N; ++i) {
const FieldDescriptor* field = descriptor->field(i);
const Destination fieldDest = getFieldDest(field);
// If current field is not default, return false immediately
if (!isDefaultField(field, messageDest)) return false;
switch (field->type()) {
case FieldDescriptor::TYPE_MESSAGE:
// if self recursion, don't go deep.
if (parents->find(field->message_type()->full_name()) != parents->end()) break;
// if is a default message, just continue
if (isDefaultMessageImpl(field->message_type(), fieldDest, parents)) break;
// sub message is not default, so this message is always not default
return false;
case FieldDescriptor::TYPE_STRING:
if (getPrivacyFlags(field).patterns_size() != 0) return false;
break;
default:
break;
}
}
parents->erase(descriptor->full_name());
return true;
}
// Recursively look at if this message is default, meaning all its fields and sub-messages
// can be described by the same dest.
static bool isDefaultMessage(const Descriptor* descriptor, const Destination dest) {
set<string> parents;
return isDefaultMessageImpl(descriptor, dest, &parents);
}
// ===============================================================================================================
static bool numberInOrder(const FieldDescriptor* f1, const FieldDescriptor* f2) {
return f1->number() < f2->number();
}
// field numbers are possibly out of order, sort them here.
static vector<const FieldDescriptor*> sortFields(const Descriptor* descriptor) {
vector<const FieldDescriptor*> fields;
fields.reserve(descriptor->field_count());
for (int i=0; i<descriptor->field_count(); i++) {
fields.push_back(descriptor->field(i));
}
std::sort(fields.begin(), fields.end(), numberInOrder);
return fields;
}
// This function looks for privacy tags of a message type and recursively its sub-messages.
// It generates Privacy objects for each non-default fields including non-default sub-messages.
// And if the message has Privacy objects generated, it returns a list of them.
// Returns false if the descriptor doesn't have any non default privacy flags set, including its submessages
static bool generatePrivacyFlags(const Descriptor* descriptor, const Destination overridden,
map<string, bool> &variableNames, set<string>* parents) {
const string messageName = getMessageName(descriptor, overridden);
const Destination messageDest = getMessageDest(descriptor, overridden);
if (variableNames.find(messageName) != variableNames.end()) {
bool hasDefault = variableNames[messageName];
return !hasDefault; // if has default, then don't generate privacy flags.
}
// insert the message type name so sub-message will figure out if self-recursion occurs
parents->insert(messageName);
// sort fields based on number, iterate though them and generate sub flags first
vector<const FieldDescriptor*> fieldsInOrder = sortFields(descriptor);
bool hasDefaultFlags[fieldsInOrder.size()];
for (size_t i=0; i<fieldsInOrder.size(); i++) {
const FieldDescriptor* field = fieldsInOrder[i];
const string fieldName = getFieldName(field);
const Destination fieldDest = getFieldDest(field);
if (variableNames.find(fieldName) != variableNames.end()) {
hasDefaultFlags[i] = variableNames[fieldName];
continue;
}
hasDefaultFlags[i] = isDefaultField(field, messageDest);
string fieldMessageName;
PrivacyFlags p = getPrivacyFlags(field);
switch (field->type()) {
case FieldDescriptor::TYPE_MESSAGE:
fieldMessageName = getMessageName(field->message_type(), fieldDest);
if (parents->find(fieldMessageName) != parents->end()) { // Self-Recursion proto definition
if (hasDefaultFlags[i]) {
hasDefaultFlags[i] = isDefaultMessage(field->message_type(), fieldDest);
}
if (!hasDefaultFlags[i]) {
printPrivacy(fieldName, field, "NULL", fieldDest, "NULL",
" // self recursion field of " + fieldMessageName);
// generate the assignment and used to construct createList function later on.
gSelfRecursionAssignments.push_back(fieldName + ".children = " + fieldMessageName);
}
} else if (generatePrivacyFlags(field->message_type(), p.dest(), variableNames, parents)) {
if (variableNames.find(fieldName) == variableNames.end()) {
printPrivacy(fieldName, field, fieldMessageName, fieldDest, "NULL");
}
hasDefaultFlags[i] = false;
} else if (!hasDefaultFlags[i]) {
printPrivacy(fieldName, field, "NULL", fieldDest, "NULL");
}
break;
case FieldDescriptor::TYPE_STRING:
if (p.patterns_size() != 0) { // if patterns are specified
if (hasDefaultFlags[i]) break;
printf("const char* %s_patterns[] = {\n", fieldName.c_str());
for (int j=0; j<p.patterns_size(); j++) {
// generated string needs to escape backslash too, duplicate it to allow escape again.
printf(" \"%s\",\n", replaceAll(p.patterns(j), '\\', "\\\\").c_str());
}
printf(" NULL };\n");
printPrivacy(fieldName, field, "NULL", fieldDest, fieldName + "_patterns");
break;
}
FALLTHROUGH_INTENDED;
// else treat string field as primitive field and goes to default
default:
if (!hasDefaultFlags[i]) printPrivacy(fieldName, field, "NULL", fieldDest, "NULL");
}
// Don't generate a variable twice
if (!hasDefaultFlags[i]) variableNames[fieldName] = false;
}
bool allDefaults = true;
for (size_t i=0; i<fieldsInOrder.size(); i++) {
allDefaults &= hasDefaultFlags[i];
}
parents->erase(messageName); // erase the message type name when exit the message.
variableNames[messageName] = allDefaults; // store the privacy tags of the message here to avoid overhead.
if (allDefaults) return false;
emptyline();
int policyCount = 0;
printf("Privacy* %s[] = {\n", messageName.c_str());
for (size_t i=0; i<fieldsInOrder.size(); i++) {
const FieldDescriptor* field = fieldsInOrder[i];
if (hasDefaultFlags[i]) continue;
printf(" &%s,\n", getFieldName(field).c_str());
policyCount++;
}
printf(" NULL };\n");
emptyline();
return true;
}
static bool generateSectionListCpp(Descriptor const* descriptor) {
generateHead("section_list");
// generate namespaces
printf("namespace android {\n");
printf("namespace os {\n");
printf("namespace incidentd {\n");
// generates SECTION_LIST
printf("// Generate SECTION_LIST.\n\n");
printf("const Section* SECTION_LIST[] = {\n");
for (int i=0; i<descriptor->field_count(); i++) {
const FieldDescriptor* field = descriptor->field(i);
if (field->type() != FieldDescriptor::TYPE_MESSAGE &&
field->type() != FieldDescriptor::TYPE_STRING &&
field->type() != FieldDescriptor::TYPE_BYTES) {
continue;
}
const SectionFlags s = getSectionFlags(field);
if (s.userdebug_and_eng_only()) {
printf("#if ALLOW_RESTRICTED_SECTIONS\n");
}
switch (s.type()) {
case SECTION_NONE:
continue;
case SECTION_FILE:
printf(" new FileSection(%d, \"%s\"),\n", field->number(), s.args().c_str());
break;
case SECTION_COMMAND:
printf(" new CommandSection(%d,", field->number());
splitAndPrint(s.args());
printf(" NULL),\n");
break;
case SECTION_DUMPSYS:
printf(" new DumpsysSection(%d, ", field->number());
splitAndPrint(s.args());
printf(" NULL),\n");
break;
case SECTION_LOG:
printf(" new LogSection(%d, ", field->number());
splitAndPrint(s.args());
printf(" NULL),\n");
break;
case SECTION_GZIP:
printf(" new GZipSection(%d,", field->number());
splitAndPrint(s.args());
printf(" NULL),\n");
break;
case SECTION_TOMBSTONE:
printf(" new TombstoneSection(%d, \"%s\"),\n", field->number(),
s.args().c_str());
break;
}
if (s.userdebug_and_eng_only()) {
printf("#endif\n");
}
}
printf(" NULL };\n");
emptyline();
printf("// =============================================================================\n");
emptyline();
// generates PRIVACY_POLICY_LIST
printf("// Generate PRIVACY_POLICY_LIST.\n\n");
map<string, bool> variableNames;
set<string> parents;
vector<const FieldDescriptor*> fieldsInOrder = sortFields(descriptor);
vector<bool> skip(fieldsInOrder.size());
const Destination incidentDest = getPrivacyFlags(descriptor).dest();
for (size_t i=0; i<fieldsInOrder.size(); i++) {
const FieldDescriptor* field = fieldsInOrder[i];
const string fieldName = getFieldName(field);
const Destination fieldDest = getFieldDest(field);
printf("\n// Incident Report Section: %s (%d)\n", field->name().c_str(), field->number());
if (field->type() != FieldDescriptor::TYPE_MESSAGE) {
printPrivacy(fieldName, field, "NULL", fieldDest, "NULL");
continue;
}
skip[i] = true;
const string fieldMessageName = getMessageName(field->message_type(), fieldDest);
// generate privacy flags for each section.
if (generatePrivacyFlags(field->message_type(), incidentDest, variableNames, &parents)) {
printPrivacy(fieldName, field, fieldMessageName, fieldDest, "NULL");
} else if (fieldDest == incidentDest) {
printf("// default %s: fieldDest=%d incidentDest=%d\n", fieldName.c_str(),
getFieldDest(field), incidentDest);
continue; // don't create a new privacy if the value is default.
} else {
printPrivacy(fieldName, field, "NULL", fieldDest, "NULL");
}
skip[i] = false;
}
// generate final PRIVACY_POLICY_LIST
emptyline();
int policyCount = 0;
if (gSelfRecursionAssignments.empty()) {
printf("Privacy* privacyArray[] = {\n");
for (size_t i=0; i<fieldsInOrder.size(); i++) {
if (skip[i]) continue;
printf(" &%s,\n", getFieldName(fieldsInOrder[i]).c_str());
policyCount++;
}
printf("};\n\n");
printf("const Privacy** PRIVACY_POLICY_LIST = const_cast<const Privacy**>(privacyArray);\n\n");
printf("const int PRIVACY_POLICY_COUNT = %d;\n", policyCount);
} else {
for (size_t i=0; i<fieldsInOrder.size(); i++) {
if (!skip[i]) policyCount++;
}
printf("static const Privacy** createList() {\n");
for (size_t i=0; i<gSelfRecursionAssignments.size(); ++i) {
printf(" %s;\n", gSelfRecursionAssignments[i].c_str());
}
printf(" Privacy** privacyArray = (Privacy**)malloc(%d * sizeof(Privacy**));\n", policyCount);
policyCount = 0; // reset
for (size_t i=0; i<fieldsInOrder.size(); i++) {
if (skip[i]) continue;
printf(" privacyArray[%d] = &%s;\n", policyCount++, getFieldName(fieldsInOrder[i]).c_str());
}
printf(" return const_cast<const Privacy**>(privacyArray);\n");
printf("}\n\n");
printf("const Privacy** PRIVACY_POLICY_LIST = createList();\n\n");
printf("const int PRIVACY_POLICY_COUNT = %d;\n", policyCount);
}
printf("} // incidentd\n");
printf("} // os\n");
printf("} // android\n");
return true;
}
// ================================================================================
static string replace_string(const string& str, const char replace, const char with)
{
string result(str);
const int N = result.size();
for (int i=0; i<N; i++) {
if (result[i] == replace) {
result[i] = with;
}
}
return result;
}
static void generateCsv(Descriptor const* descriptor, const string& indent, set<string>* parents, const Destination containerDest = DEST_UNSET) {
DebugStringOptions options;
options.include_comments = true;
for (int i=0; i<descriptor->field_count(); i++) {
const FieldDescriptor* field = descriptor->field(i);
const Destination fieldDest = getFieldDest(field);
stringstream text;
if (field->type() == FieldDescriptor::TYPE_MESSAGE) {
text << field->message_type()->name();
} else {
text << field->type_name();
}
text << " " << field->name();
text << " (PRIVACY=";
if (isDefaultField(field, containerDest)) {
text << getDestString(containerDest);
} else {
text << getDestString(fieldDest);
}
text << ")";
printf("%s%s,\n", indent.c_str(), replace_string(text.str(), '\n', ' ').c_str());
if (field->type() == FieldDescriptor::TYPE_MESSAGE &&
parents->find(field->message_type()->full_name()) == parents->end()) {
parents->insert(field->message_type()->full_name());
generateCsv(field->message_type(), indent + ",", parents, fieldDest);
parents->erase(field->message_type()->full_name());
}
}
}
// ================================================================================
int main(int argc, char const *argv[])
{
if (argc < 2) return 1;
const char* module = argv[1];
Descriptor const* descriptor = IncidentProto::descriptor();
if (strcmp(module, "incident") == 0) {
return !generateIncidentSectionsCpp(descriptor);
}
if (strcmp(module, "incidentd") == 0 ) {
return !generateSectionListCpp(descriptor);
}
// Generates Csv Format of proto definition for each section.
if (strcmp(module, "csv") == 0 && argc > 2) {
int sectionId = atoi(argv[2]);
for (int i=0; i<descriptor->field_count(); i++) {
const FieldDescriptor* field = descriptor->field(i);
if (strcmp(field->name().c_str(), argv[2]) == 0
|| field->number() == sectionId) {
set<string> parents;
printf("%s\n", field->name().c_str());
generateCsv(field->message_type(), "", &parents, getFieldDest(field));
break;
}
}
// Returns failure if csv is enabled to prevent Android building with it.
// It doesn't matter if this command runs manually.
return 1;
}
// Returns failure if not called by the whitelisted modules
return 1;
}