LLDB  mainline
PlatformAndroidRemoteGDBServer.cpp
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1 //===-- PlatformAndroidRemoteGDBServer.cpp --------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
11 #include "lldb/Utility/Log.h"
12 #include "lldb/Utility/Status.h"
13 #include "lldb/Utility/UriParser.h"
14 
16 
17 #include <sstream>
18 
19 using namespace lldb;
20 using namespace lldb_private;
21 using namespace platform_android;
22 
24  0; // Alias for the process id of lldb-platform
25 
27  const uint16_t local_port, const uint16_t remote_port,
28  llvm::StringRef remote_socket_name,
29  const llvm::Optional<AdbClient::UnixSocketNamespace> &socket_namespace,
30  std::string &device_id) {
32 
33  AdbClient adb;
34  auto error = AdbClient::CreateByDeviceID(device_id, adb);
35  if (error.Fail())
36  return error;
37 
38  device_id = adb.GetDeviceID();
39  LLDB_LOGF(log, "Connected to Android device \"%s\"", device_id.c_str());
40 
41  if (remote_port != 0) {
42  LLDB_LOGF(log, "Forwarding remote TCP port %d to local TCP port %d",
43  remote_port, local_port);
44  return adb.SetPortForwarding(local_port, remote_port);
45  }
46 
47  LLDB_LOGF(log, "Forwarding remote socket \"%s\" to local TCP port %d",
48  remote_socket_name.str().c_str(), local_port);
49 
50  if (!socket_namespace)
51  return Status("Invalid socket namespace");
52 
53  return adb.SetPortForwarding(local_port, remote_socket_name,
54  *socket_namespace);
55 }
56 
58  const std::string &device_id) {
59  AdbClient adb(device_id);
60  return adb.DeletePortForwarding(local_port);
61 }
62 
64  Status error;
65  std::unique_ptr<TCPSocket> tcp_socket(new TCPSocket(true, false));
66  if (error.Fail())
67  return error;
68 
69  error = tcp_socket->Listen("127.0.0.1:0", 1);
70  if (error.Success())
71  port = tcp_socket->GetLocalPortNumber();
72 
73  return error;
74 }
75 
76 PlatformAndroidRemoteGDBServer::PlatformAndroidRemoteGDBServer() = default;
77 
78 PlatformAndroidRemoteGDBServer::~PlatformAndroidRemoteGDBServer() {
79  for (const auto &it : m_port_forwards)
80  DeleteForwardPortWithAdb(it.second, m_device_id);
81 }
82 
83 bool PlatformAndroidRemoteGDBServer::LaunchGDBServer(lldb::pid_t &pid,
84  std::string &connect_url) {
85  assert(IsConnected());
86  uint16_t remote_port = 0;
87  std::string socket_name;
88  if (!m_gdb_client_up->LaunchGDBServer("127.0.0.1", pid, remote_port,
89  socket_name))
90  return false;
91 
93 
94  auto error =
95  MakeConnectURL(pid, remote_port, socket_name.c_str(), connect_url);
96  if (error.Success() && log)
97  LLDB_LOGF(log, "gdbserver connect URL: %s", connect_url.c_str());
98 
99  return error.Success();
100 }
101 
102 bool PlatformAndroidRemoteGDBServer::KillSpawnedProcess(lldb::pid_t pid) {
103  assert(IsConnected());
104  DeleteForwardPort(pid);
105  return m_gdb_client_up->KillSpawnedProcess(pid);
106 }
107 
108 Status PlatformAndroidRemoteGDBServer::ConnectRemote(Args &args) {
109  m_device_id.clear();
110 
111  if (args.GetArgumentCount() != 1)
112  return Status(
113  "\"platform connect\" takes a single argument: <connect-url>");
114 
115  const char *url = args.GetArgumentAtIndex(0);
116  if (!url)
117  return Status("URL is null.");
118  llvm::Optional<URI> parsed_url = URI::Parse(url);
119  if (!parsed_url)
120  return Status("Invalid URL: %s", url);
121  if (parsed_url->hostname != "localhost")
122  m_device_id = parsed_url->hostname.str();
123 
124  m_socket_namespace.reset();
125  if (parsed_url->scheme == "unix-connect")
126  m_socket_namespace = AdbClient::UnixSocketNamespaceFileSystem;
127  else if (parsed_url->scheme == "unix-abstract-connect")
128  m_socket_namespace = AdbClient::UnixSocketNamespaceAbstract;
129 
130  std::string connect_url;
131  auto error =
132  MakeConnectURL(g_remote_platform_pid, parsed_url->port.getValueOr(0),
133  parsed_url->path, connect_url);
134 
135  if (error.Fail())
136  return error;
137 
138  args.ReplaceArgumentAtIndex(0, connect_url);
139 
141  LLDB_LOGF(log, "Rewritten platform connect URL: %s", connect_url.c_str());
142 
143  error = PlatformRemoteGDBServer::ConnectRemote(args);
144  if (error.Fail())
145  DeleteForwardPort(g_remote_platform_pid);
146 
147  return error;
148 }
149 
150 Status PlatformAndroidRemoteGDBServer::DisconnectRemote() {
151  DeleteForwardPort(g_remote_platform_pid);
152  return PlatformRemoteGDBServer::DisconnectRemote();
153 }
154 
155 void PlatformAndroidRemoteGDBServer::DeleteForwardPort(lldb::pid_t pid) {
157 
158  auto it = m_port_forwards.find(pid);
159  if (it == m_port_forwards.end())
160  return;
161 
162  const auto port = it->second;
163  const auto error = DeleteForwardPortWithAdb(port, m_device_id);
164  if (error.Fail()) {
165  LLDB_LOGF(log,
166  "Failed to delete port forwarding (pid=%" PRIu64
167  ", port=%d, device=%s): %s",
168  pid, port, m_device_id.c_str(), error.AsCString());
169  }
170  m_port_forwards.erase(it);
171 }
172 
173 Status PlatformAndroidRemoteGDBServer::MakeConnectURL(
174  const lldb::pid_t pid, const uint16_t remote_port,
175  llvm::StringRef remote_socket_name, std::string &connect_url) {
176  static const int kAttempsNum = 5;
177 
178  Status error;
179  // There is a race possibility that somebody will occupy a port while we're
180  // in between FindUnusedPort and ForwardPortWithAdb - adding the loop to
181  // mitigate such problem.
182  for (auto i = 0; i < kAttempsNum; ++i) {
183  uint16_t local_port = 0;
184  error = FindUnusedPort(local_port);
185  if (error.Fail())
186  return error;
187 
188  error = ForwardPortWithAdb(local_port, remote_port, remote_socket_name,
189  m_socket_namespace, m_device_id);
190  if (error.Success()) {
191  m_port_forwards[pid] = local_port;
192  std::ostringstream url_str;
193  url_str << "connect://127.0.0.1:" << local_port;
194  connect_url = url_str.str();
195  break;
196  }
197  }
198 
199  return error;
200 }
201 
202 lldb::ProcessSP PlatformAndroidRemoteGDBServer::ConnectProcess(
203  llvm::StringRef connect_url, llvm::StringRef plugin_name,
204  lldb_private::Debugger &debugger, lldb_private::Target *target,
206  // We don't have the pid of the remote gdbserver when it isn't started by us
207  // but we still want to store the list of port forwards we set up in our port
208  // forward map. Generate a fake pid for these cases what won't collide with
209  // any other valid pid on android.
210  static lldb::pid_t s_remote_gdbserver_fake_pid = 0xffffffffffffffffULL;
211 
212  llvm::Optional<URI> parsed_url = URI::Parse(connect_url);
213  if (!parsed_url) {
214  error.SetErrorStringWithFormat("Invalid URL: %s",
215  connect_url.str().c_str());
216  return nullptr;
217  }
218 
219  std::string new_connect_url;
220  error = MakeConnectURL(s_remote_gdbserver_fake_pid--,
221  parsed_url->port.getValueOr(0), parsed_url->path,
222  new_connect_url);
223  if (error.Fail())
224  return nullptr;
225 
226  return PlatformRemoteGDBServer::ConnectProcess(new_connect_url, plugin_name,
227  debugger, target, error);
228 }
lldb_private::Args::ReplaceArgumentAtIndex
void ReplaceArgumentAtIndex(size_t idx, llvm::StringRef arg_str, char quote_char='\0')
Replaces the argument value at index idx to arg_str if idx is a valid argument index.
Definition: Args.cpp:333
LLDB_LOGF
#define LLDB_LOGF(log,...)
Definition: Log.h:247
DeleteForwardPortWithAdb
static Status DeleteForwardPortWithAdb(uint16_t local_port, const std::string &device_id)
Definition: PlatformAndroidRemoteGDBServer.cpp:57
LIBLLDB_LOG_PLATFORM
#define LIBLLDB_LOG_PLATFORM
Definition: Logging.h:39
lldb_private::Args
Definition: Args.h:33
lldb_private::Target
Definition: Target.h:452
error
static llvm::raw_ostream & error(Stream &strm)
Definition: CommandReturnObject.cpp:17
Log.h
lldb_private::platform_android::AdbClient::GetDeviceID
const std::string & GetDeviceID() const
Definition: AdbClient.cpp:127
FindUnusedPort
static Status FindUnusedPort(uint16_t &port)
Definition: PlatformAndroidRemoteGDBServer.cpp:63
lldb_private::GetLogIfAllCategoriesSet
Log * GetLogIfAllCategoriesSet(uint32_t mask)
Definition: Logging.cpp:58
ConnectionFileDescriptor.h
lldb_private::Debugger
Definition: Debugger.h:70
string
string(SUBSTRING ${p} 10 -1 pStripped) if($
Definition: Plugins/CMakeLists.txt:40
lldb_private::Status
Definition: Status.h:44
lldb_private::Args::GetArgumentAtIndex
const char * GetArgumentAtIndex(size_t idx) const
Gets the NULL terminated C string argument pointer for the argument at index idx.
Definition: Args.cpp:259
lldb_private::platform_android::AdbClient
Definition: AdbClient.h:26
PlatformAndroidRemoteGDBServer.h
lldb::pid_t
uint64_t pid_t
Definition: lldb-types.h:85
lldb_private::platform_android::AdbClient::SetPortForwarding
Status SetPortForwarding(const uint16_t local_port, const uint16_t remote_port)
Definition: AdbClient.cpp:169
uint16_t
TCPSocket.h
g_remote_platform_pid
static const lldb::pid_t g_remote_platform_pid
Definition: PlatformAndroidRemoteGDBServer.cpp:23
Status.h
lldb_private::TCPSocket
Definition: TCPSocket.h:17
lldb_private
A class that represents a running process on the host machine.
Definition: SBCommandInterpreterRunOptions.h:16
lldb_private::platform_android::AdbClient::DeletePortForwarding
Status DeletePortForwarding(const uint16_t local_port)
Definition: AdbClient.cpp:201
lldb_private::Log
Definition: Log.h:49
UriParser.h
lldb_private::Args::GetArgumentCount
size_t GetArgumentCount() const
Gets the number of arguments left in this command object.
Definition: Args.h:118
lldb
Definition: SBAddress.h:15
ForwardPortWithAdb
static Status ForwardPortWithAdb(const uint16_t local_port, const uint16_t remote_port, llvm::StringRef remote_socket_name, const llvm::Optional< AdbClient::UnixSocketNamespace > &socket_namespace, std::string &device_id)
Definition: PlatformAndroidRemoteGDBServer.cpp:26