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* Copyright 2017, 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include <cutils/qtaguid.h>
// #define LOG_NDEBUG 0
#define LOG_TAG "qtaguid"
#include <dlfcn.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <log/log.h>
class netdHandler {
int (*netdTagSocket)(int, uint32_t, uid_t);
int (*netdUntagSocket)(int);
int (*netdSetCounterSet)(uint32_t, uid_t);
int (*netdDeleteTagData)(uint32_t, uid_t);
int dummyTagSocket(int, uint32_t, uid_t) {
return -EREMOTEIO;
int dummyUntagSocket(int) {
return -EREMOTEIO;
int dummySetCounterSet(uint32_t, uid_t) {
return -EREMOTEIO;
int dummyDeleteTagData(uint32_t, uid_t) {
return -EREMOTEIO;
netdHandler initHandler(void) {
netdHandler handler = {dummyTagSocket, dummyUntagSocket, dummySetCounterSet, dummyDeleteTagData};
void* netdClientHandle = dlopen("", RTLD_NOW);
if (!netdClientHandle) {
ALOGE("Failed to open %s", dlerror());
return handler;
handler.netdTagSocket = (int (*)(int, uint32_t, uid_t))dlsym(netdClientHandle, "tagSocket");
if (!handler.netdTagSocket) {
ALOGE("load netdTagSocket handler failed: %s", dlerror());
handler.netdUntagSocket = (int (*)(int))dlsym(netdClientHandle, "untagSocket");
if (!handler.netdUntagSocket) {
ALOGE("load netdUntagSocket handler failed: %s", dlerror());
handler.netdSetCounterSet = (int (*)(uint32_t, uid_t))dlsym(netdClientHandle, "setCounterSet");
if (!handler.netdSetCounterSet) {
ALOGE("load netdSetCounterSet handler failed: %s", dlerror());
handler.netdDeleteTagData = (int (*)(uint32_t, uid_t))dlsym(netdClientHandle, "deleteTagData");
if (!handler.netdDeleteTagData) {
ALOGE("load netdDeleteTagData handler failed: %s", dlerror());
return handler;
// The language guarantees that this object will be initialized in a thread-safe way.
static netdHandler& getHandler() {
static netdHandler instance = initHandler();
return instance;
int qtaguid_tagSocket(int sockfd, int tag, uid_t uid) {
// Check the socket fd passed to us is still valid before we load the netd
// client. Pass a already closed socket fd to netd client may let netd open
// the unix socket with the same fd number and pass it to server for
// tagging.
// TODO: move the check into netdTagSocket.
int res = fcntl(sockfd, F_GETFD);
if (res < 0) return res;
ALOGV("Tagging socket %d with tag %u for uid %d", sockfd, tag, uid);
return getHandler().netdTagSocket(sockfd, tag, uid);
int qtaguid_untagSocket(int sockfd) {
// Similiar to tag socket. We need a check before untag to make sure untag a closed socket fail
// as expected.
// TODO: move the check into netdTagSocket.
int res = fcntl(sockfd, F_GETFD);
if (res < 0) return res;
ALOGV("Untagging socket %d", sockfd);
return getHandler().netdUntagSocket(sockfd);
int qtaguid_setCounterSet(int counterSetNum, uid_t uid) {
ALOGV("Setting counters to set %d for uid %d", counterSetNum, uid);
return getHandler().netdSetCounterSet(counterSetNum, uid);
int qtaguid_deleteTagData(int tag, uid_t uid) {
ALOGV("Deleting tag data with tag %u for uid %d", tag, uid);
return getHandler().netdDeleteTagData(tag, uid);