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129 lines
4.1 KiB
129 lines
4.1 KiB
/*
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* Copyright (C) 2019 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 "adbconnection/server.h"
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#include <sys/epoll.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <unistd.h>
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#include <algorithm>
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#include <array>
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#include <vector>
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#include <android-base/logging.h>
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#include <android-base/unique_fd.h>
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#include "adbconnection/process_info.h"
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using android::base::unique_fd;
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#define JDWP_CONTROL_NAME "\0jdwp-control"
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#define JDWP_CONTROL_NAME_LEN (sizeof(JDWP_CONTROL_NAME) - 1)
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static_assert(JDWP_CONTROL_NAME_LEN <= sizeof(reinterpret_cast<sockaddr_un*>(0)->sun_path));
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// Listen for incoming jdwp clients forever.
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void adbconnection_listen(void (*callback)(int fd, ProcessInfo process)) {
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sockaddr_un addr = {};
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socklen_t addrlen = JDWP_CONTROL_NAME_LEN + sizeof(addr.sun_family);
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addr.sun_family = AF_UNIX;
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memcpy(addr.sun_path, JDWP_CONTROL_NAME, JDWP_CONTROL_NAME_LEN);
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unique_fd s(socket(AF_UNIX, SOCK_SEQPACKET | SOCK_NONBLOCK | SOCK_CLOEXEC, 0));
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if (s < 0) {
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PLOG(ERROR) << "failed to create JDWP control socket";
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return;
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}
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if (bind(s.get(), reinterpret_cast<sockaddr*>(&addr), addrlen) < 0) {
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PLOG(ERROR) << "failed to bind JDWP control socket";
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return;
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}
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if (listen(s.get(), 4) < 0) {
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PLOG(ERROR) << "failed to listen on JDWP control socket";
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return;
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}
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std::vector<unique_fd> pending_connections;
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unique_fd epfd(epoll_create1(EPOLL_CLOEXEC));
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std::array<epoll_event, 16> events;
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events[0].events = EPOLLIN;
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events[0].data.fd = -1;
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if (epoll_ctl(epfd.get(), EPOLL_CTL_ADD, s.get(), &events[0]) != 0) {
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LOG(FATAL) << "failed to register event with epoll fd";
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}
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while (true) {
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int epoll_rc = TEMP_FAILURE_RETRY(epoll_wait(epfd.get(), events.data(), events.size(), -1));
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if (epoll_rc == -1) {
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PLOG(FATAL) << "epoll_wait failed";
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}
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for (int i = 0; i < epoll_rc; ++i) {
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const epoll_event& event = events[i];
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if (event.data.fd == -1) {
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unique_fd client(
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TEMP_FAILURE_RETRY(accept4(s.get(), nullptr, nullptr, SOCK_NONBLOCK | SOCK_CLOEXEC)));
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if (client == -1) {
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PLOG(WARNING) << "failed to accept client on JDWP control socket";
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continue;
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}
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epoll_event register_event;
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register_event.events = EPOLLIN;
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register_event.data.fd = client.get();
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if (epoll_ctl(epfd.get(), EPOLL_CTL_ADD, client.get(), ®ister_event) != 0) {
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PLOG(FATAL) << "failed to register JDWP client with epoll";
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}
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pending_connections.emplace_back(std::move(client));
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} else {
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// n^2, but the backlog should be short.
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auto it = std::find_if(pending_connections.begin(), pending_connections.end(),
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[&](const unique_fd& fd) { return fd.get() == event.data.fd; });
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if (it == pending_connections.end()) {
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LOG(FATAL) << "failed to find JDWP client (" << event.data.fd
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<< ") in pending connections";
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}
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ProcessInfo process;
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int rc = TEMP_FAILURE_RETRY(recv(it->get(), &process, sizeof(process), MSG_DONTWAIT));
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if (rc != sizeof(process)) {
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LOG(ERROR) << "received data of incorrect size from JDWP client: read " << rc
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<< ", expected " << sizeof(process);
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} else {
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callback(it->release(), process);
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}
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if (epoll_ctl(epfd.get(), EPOLL_CTL_DEL, event.data.fd, nullptr) != 0) {
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LOG(FATAL) << "failed to delete fd from JDWP epoll fd";
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}
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pending_connections.erase(it);
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}
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}
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}
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}
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