/*
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* Copyright 2017, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <cutils/qtaguid.h>
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// #define LOG_NDEBUG 0
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#define LOG_TAG "qtaguid"
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#include <dlfcn.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <log/log.h>
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class netdHandler {
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public:
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int (*netdTagSocket)(int, uint32_t, uid_t);
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int (*netdUntagSocket)(int);
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int (*netdSetCounterSet)(uint32_t, uid_t);
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int (*netdDeleteTagData)(uint32_t, uid_t);
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};
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int dummyTagSocket(int, uint32_t, uid_t) {
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return -EREMOTEIO;
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}
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int dummyUntagSocket(int) {
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return -EREMOTEIO;
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}
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int dummySetCounterSet(uint32_t, uid_t) {
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return -EREMOTEIO;
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}
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int dummyDeleteTagData(uint32_t, uid_t) {
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return -EREMOTEIO;
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}
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netdHandler initHandler(void) {
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netdHandler handler = {dummyTagSocket, dummyUntagSocket, dummySetCounterSet, dummyDeleteTagData};
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void* netdClientHandle = dlopen("libnetd_client.so", RTLD_NOW);
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if (!netdClientHandle) {
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ALOGE("Failed to open libnetd_client.so: %s", dlerror());
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return handler;
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}
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handler.netdTagSocket = (int (*)(int, uint32_t, uid_t))dlsym(netdClientHandle, "tagSocket");
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if (!handler.netdTagSocket) {
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ALOGE("load netdTagSocket handler failed: %s", dlerror());
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}
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handler.netdUntagSocket = (int (*)(int))dlsym(netdClientHandle, "untagSocket");
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if (!handler.netdUntagSocket) {
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ALOGE("load netdUntagSocket handler failed: %s", dlerror());
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}
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handler.netdSetCounterSet = (int (*)(uint32_t, uid_t))dlsym(netdClientHandle, "setCounterSet");
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if (!handler.netdSetCounterSet) {
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ALOGE("load netdSetCounterSet handler failed: %s", dlerror());
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}
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handler.netdDeleteTagData = (int (*)(uint32_t, uid_t))dlsym(netdClientHandle, "deleteTagData");
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if (!handler.netdDeleteTagData) {
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ALOGE("load netdDeleteTagData handler failed: %s", dlerror());
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}
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return handler;
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}
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// The language guarantees that this object will be initialized in a thread-safe way.
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static netdHandler& getHandler() {
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static netdHandler instance = initHandler();
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return instance;
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}
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int qtaguid_tagSocket(int sockfd, int tag, uid_t uid) {
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// Check the socket fd passed to us is still valid before we load the netd
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// client. Pass a already closed socket fd to netd client may let netd open
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// the unix socket with the same fd number and pass it to server for
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// tagging.
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// TODO: move the check into netdTagSocket.
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int res = fcntl(sockfd, F_GETFD);
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if (res < 0) return res;
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ALOGV("Tagging socket %d with tag %u for uid %d", sockfd, tag, uid);
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return getHandler().netdTagSocket(sockfd, tag, uid);
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}
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int qtaguid_untagSocket(int sockfd) {
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// Similiar to tag socket. We need a check before untag to make sure untag a closed socket fail
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// as expected.
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// TODO: move the check into netdTagSocket.
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int res = fcntl(sockfd, F_GETFD);
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if (res < 0) return res;
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ALOGV("Untagging socket %d", sockfd);
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return getHandler().netdUntagSocket(sockfd);
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}
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int qtaguid_setCounterSet(int counterSetNum, uid_t uid) {
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ALOGV("Setting counters to set %d for uid %d", counterSetNum, uid);
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return getHandler().netdSetCounterSet(counterSetNum, uid);
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}
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int qtaguid_deleteTagData(int tag, uid_t uid) {
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ALOGV("Deleting tag data with tag %u for uid %d", tag, uid);
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return getHandler().netdDeleteTagData(tag, uid);
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}
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