| /* |
| * 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 |
| * |
| * 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 <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 { |
| public: |
| 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("libnetd_client.so", RTLD_NOW); |
| if (!netdClientHandle) { |
| ALOGE("Failed to open libnetd_client.so: %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); |
| } |