| /* |
| * Copyright (C) 2015 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 "adb_listeners.h" |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| |
| #include <android-base/stringprintf.h> |
| #include <android-base/strings.h> |
| #include <cutils/sockets.h> |
| |
| #include "socket_spec.h" |
| #include "sysdeps.h" |
| #include "transport.h" |
| |
| // A listener is an entity which binds to a local port and, upon receiving a connection on that |
| // port, creates an asocket to connect the new local connection to a specific remote service. |
| // |
| // TODO: some listeners read from the new connection to determine what exact service to connect to |
| // on the far side. |
| class alistener { |
| public: |
| alistener(const std::string& _local_name, const std::string& _connect_to); |
| ~alistener(); |
| |
| fdevent fde; |
| int fd = -1; |
| |
| std::string local_name; |
| std::string connect_to; |
| atransport* transport = nullptr; |
| adisconnect disconnect; |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(alistener); |
| }; |
| |
| alistener::alistener(const std::string& _local_name, const std::string& _connect_to) |
| : local_name(_local_name), connect_to(_connect_to) { |
| } |
| |
| alistener::~alistener() { |
| // Closes the corresponding fd. |
| fdevent_remove(&fde); |
| |
| if (transport) { |
| transport->RemoveDisconnect(&disconnect); |
| } |
| } |
| |
| // listener_list retains ownership of all created alistener objects. Removing an alistener from |
| // this list will cause it to be deleted. |
| typedef std::list<std::unique_ptr<alistener>> ListenerList; |
| static ListenerList& listener_list = *new ListenerList(); |
| |
| static void ss_listener_event_func(int _fd, unsigned ev, void *_l) { |
| if (ev & FDE_READ) { |
| int fd = adb_socket_accept(_fd, nullptr, nullptr); |
| if (fd < 0) return; |
| |
| int rcv_buf_size = CHUNK_SIZE; |
| adb_setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &rcv_buf_size, sizeof(rcv_buf_size)); |
| |
| asocket* s = create_local_socket(fd); |
| if (s) { |
| connect_to_smartsocket(s); |
| return; |
| } |
| |
| adb_close(fd); |
| } |
| } |
| |
| static void listener_event_func(int _fd, unsigned ev, void* _l) |
| { |
| alistener* listener = reinterpret_cast<alistener*>(_l); |
| asocket *s; |
| |
| if (ev & FDE_READ) { |
| int fd = adb_socket_accept(_fd, nullptr, nullptr); |
| if (fd < 0) { |
| return; |
| } |
| |
| s = create_local_socket(fd); |
| if (s) { |
| s->transport = listener->transport; |
| connect_to_remote(s, listener->connect_to.c_str()); |
| return; |
| } |
| |
| adb_close(fd); |
| } |
| } |
| |
| // Called as a transport disconnect function. |arg| is the raw alistener*. |
| static void listener_disconnect(void* arg, atransport*) { |
| for (auto iter = listener_list.begin(); iter != listener_list.end(); ++iter) { |
| if (iter->get() == arg) { |
| (*iter)->transport = nullptr; |
| listener_list.erase(iter); |
| return; |
| } |
| } |
| } |
| |
| // Write the list of current listeners (network redirections) into a string. |
| std::string format_listeners() { |
| std::string result; |
| for (auto& l : listener_list) { |
| // Ignore special listeners like those for *smartsocket* |
| if (l->connect_to[0] == '*') { |
| continue; |
| } |
| // <device-serial> " " <local-name> " " <remote-name> "\n" |
| // Entries from "adb reverse" have no serial. |
| android::base::StringAppendF(&result, "%s %s %s\n", |
| l->transport->serial ? l->transport->serial : "(reverse)", |
| l->local_name.c_str(), l->connect_to.c_str()); |
| } |
| return result; |
| } |
| |
| InstallStatus remove_listener(const char* local_name, atransport* transport) { |
| for (auto iter = listener_list.begin(); iter != listener_list.end(); ++iter) { |
| if (local_name == (*iter)->local_name) { |
| listener_list.erase(iter); |
| return INSTALL_STATUS_OK; |
| } |
| } |
| return INSTALL_STATUS_LISTENER_NOT_FOUND; |
| } |
| |
| void remove_all_listeners() { |
| auto iter = listener_list.begin(); |
| while (iter != listener_list.end()) { |
| // Never remove smart sockets. |
| if ((*iter)->connect_to[0] == '*') { |
| ++iter; |
| } else { |
| iter = listener_list.erase(iter); |
| } |
| } |
| } |
| |
| InstallStatus install_listener(const std::string& local_name, const char* connect_to, |
| atransport* transport, int no_rebind, int* resolved_tcp_port, |
| std::string* error) { |
| for (auto& l : listener_list) { |
| if (local_name == l->local_name) { |
| // Can't repurpose a smartsocket. |
| if(l->connect_to[0] == '*') { |
| *error = "cannot repurpose smartsocket"; |
| return INSTALL_STATUS_INTERNAL_ERROR; |
| } |
| |
| // Can't repurpose a listener if 'no_rebind' is true. |
| if (no_rebind) { |
| *error = "cannot rebind"; |
| return INSTALL_STATUS_CANNOT_REBIND; |
| } |
| |
| l->connect_to = connect_to; |
| if (l->transport != transport) { |
| l->transport->RemoveDisconnect(&l->disconnect); |
| l->transport = transport; |
| l->transport->AddDisconnect(&l->disconnect); |
| } |
| return INSTALL_STATUS_OK; |
| } |
| } |
| |
| std::unique_ptr<alistener> listener(new alistener(local_name, connect_to)); |
| |
| int resolved = 0; |
| listener->fd = socket_spec_listen(listener->local_name, error, &resolved); |
| if (listener->fd < 0) { |
| return INSTALL_STATUS_CANNOT_BIND; |
| } |
| |
| // If the caller requested port 0, update the listener name with the resolved port. |
| if (resolved != 0) { |
| listener->local_name = android::base::StringPrintf("tcp:%d", resolved); |
| if (resolved_tcp_port) { |
| *resolved_tcp_port = resolved; |
| } |
| } |
| |
| close_on_exec(listener->fd); |
| if (listener->connect_to == "*smartsocket*") { |
| fdevent_install(&listener->fde, listener->fd, ss_listener_event_func, listener.get()); |
| } else { |
| fdevent_install(&listener->fde, listener->fd, listener_event_func, listener.get()); |
| } |
| fdevent_set(&listener->fde, FDE_READ); |
| |
| listener->transport = transport; |
| |
| if (transport) { |
| listener->disconnect.opaque = listener.get(); |
| listener->disconnect.func = listener_disconnect; |
| transport->AddDisconnect(&listener->disconnect); |
| } |
| |
| listener_list.push_back(std::move(listener)); |
| return INSTALL_STATUS_OK; |
| } |