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122 lines
4.0 KiB
122 lines
4.0 KiB
/*
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* Copyright (C) 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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/* Utility that uses an adb connection as the login shell. */
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#include <array>
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#include <cassert>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include <string>
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#include <vector>
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#include <errno.h>
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#include <unistd.h>
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#include "common/libs/utils/environment.h"
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#include "host/libs/config/cuttlefish_config.h"
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// Many of our users interact with CVDs via ssh. They expect to be able to
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// get an Android shell (as opposed to the host shell) with a single command.
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//
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// Our goals are to:
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//
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// * Allow the user to select which CVD to connect to
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//
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// * Avoid modifications to the host-side sshd and the protocol
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//
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// We accomplish this by using specialized accounts: vsoc-## and cvd-## and
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// specific Android serial numbers:
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//
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// The vsoc-01 account provides a host-side shell that controls the first CVD
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// The cvd-01 account is connected to the Andorid shell of the first CVD
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// The first CVD has a serial number of CUTTLEFISHCVD01
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//
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// The code in the commands/launch directory also follows these conventions by
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// default.
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//
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namespace {
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std::string VsocUser() {
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std::string user = cuttlefish::StringFromEnv("USER", "");
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assert(!user_cstring.empty());
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std::string cvd_prefix = "cvd-";
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if (user.find(cvd_prefix) == 0) {
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user.replace(0, cvd_prefix.size(), cuttlefish::kVsocUserPrefix);
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}
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return user;
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}
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std::string CuttlefishConfigLocation() {
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return std::string("/home/") + VsocUser() +
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"/cuttlefish_runtime/cuttlefish_config.json";
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}
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std::string CuttlefishFindAdb() {
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std::string rval = std::string("/home/") + VsocUser() + "/bin/adb";
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if (TEMP_FAILURE_RETRY(access(rval.c_str(), X_OK)) == -1) {
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return "/usr/bin/adb";
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}
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return rval;
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}
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void SetCuttlefishConfigEnv() {
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setenv(cuttlefish::kCuttlefishConfigEnvVarName, CuttlefishConfigLocation().c_str(),
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true);
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}
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} // namespace
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int main(int argc, char* argv[]) {
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SetCuttlefishConfigEnv();
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auto instance = cuttlefish::CuttlefishConfig::Get()
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->ForDefaultInstance().adb_device_name();
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std::string adb_path = CuttlefishFindAdb();
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std::vector<char*> new_argv = {
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const_cast<char*>(adb_path.c_str()), const_cast<char*>("-s"),
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const_cast<char*>(instance.c_str()), const_cast<char*>("shell"),
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const_cast<char*>("/system/bin/sh")};
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// Some important data is lost before this point, and there are
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// no great recovery options:
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// * ssh with no arguments comes in with 1 arg of -adbshell. The command
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// given above does the right thing if we don't invoke the shell.
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if (argc == 1) {
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new_argv.back() = nullptr;
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}
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// * simple shell commands come in with a -c and a single string. The
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// problem here is that adb doesn't preserve spaces, so we need
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// to do additional escaping. The best compromise seems to be to
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// throw double quotes around each string.
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for (int i = 1; i < argc; ++i) {
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size_t buf_size = std::strlen(argv[i]) + 4;
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new_argv.push_back(new char[buf_size]);
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std::snprintf(new_argv.back(), buf_size, "\"%s\"", argv[i]);
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}
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//
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// * scp seems to be pathologically broken when paths contain spaces.
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// spaces aren't properly escaped by gcloud, so scp will fail with
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// "scp: with ambiguous target." We might be able to fix this with
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// some creative parsing of the arguments, but that seems like
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// overkill.
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new_argv.push_back(nullptr);
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execv(new_argv[0], new_argv.data());
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// This never should happen
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return 2;
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}
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