1 //===-- ProcessLaunchInfo.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 
9 #include <climits>
10 
11 #include "lldb/Host/Config.h"
12 #include "lldb/Host/FileAction.h"
13 #include "lldb/Host/FileSystem.h"
14 #include "lldb/Host/HostInfo.h"
15 #include "lldb/Host/ProcessLaunchInfo.h"
16 #include "lldb/Utility/Log.h"
17 #include "lldb/Utility/StreamString.h"
18 
19 #include "llvm/Support/ConvertUTF.h"
20 #include "llvm/Support/FileSystem.h"
21 
22 #if !defined(_WIN32)
23 #include <limits.h>
24 #endif
25 
26 using namespace lldb;
27 using namespace lldb_private;
28 
29 // ProcessLaunchInfo member functions
30 
31 ProcessLaunchInfo::ProcessLaunchInfo()
32     : ProcessInfo(), m_working_dir(), m_plugin_name(), m_flags(0),
33       m_file_actions(), m_pty(new PseudoTerminal), m_resume_count(0),
34       m_monitor_callback(nullptr), m_monitor_callback_baton(nullptr),
35       m_monitor_signals(false), m_listener_sp(), m_hijack_listener_sp(),
36       m_scripted_process_class_name(), m_scripted_process_dictionary_sp() {}
37 
38 ProcessLaunchInfo::ProcessLaunchInfo(const FileSpec &stdin_file_spec,
39                                      const FileSpec &stdout_file_spec,
40                                      const FileSpec &stderr_file_spec,
41                                      const FileSpec &working_directory,
42                                      uint32_t launch_flags)
43     : ProcessInfo(), m_working_dir(), m_plugin_name(), m_flags(launch_flags),
44       m_file_actions(), m_pty(new PseudoTerminal), m_resume_count(0),
45       m_monitor_callback(nullptr), m_monitor_callback_baton(nullptr),
46       m_monitor_signals(false), m_listener_sp(), m_hijack_listener_sp(),
47       m_scripted_process_class_name(), m_scripted_process_dictionary_sp() {
48   if (stdin_file_spec) {
49     FileAction file_action;
50     const bool read = true;
51     const bool write = false;
52     if (file_action.Open(STDIN_FILENO, stdin_file_spec, read, write))
53       AppendFileAction(file_action);
54   }
55   if (stdout_file_spec) {
56     FileAction file_action;
57     const bool read = false;
58     const bool write = true;
59     if (file_action.Open(STDOUT_FILENO, stdout_file_spec, read, write))
60       AppendFileAction(file_action);
61   }
62   if (stderr_file_spec) {
63     FileAction file_action;
64     const bool read = false;
65     const bool write = true;
66     if (file_action.Open(STDERR_FILENO, stderr_file_spec, read, write))
67       AppendFileAction(file_action);
68   }
69   if (working_directory)
70     SetWorkingDirectory(working_directory);
71 }
72 
73 bool ProcessLaunchInfo::AppendCloseFileAction(int fd) {
74   FileAction file_action;
75   if (file_action.Close(fd)) {
76     AppendFileAction(file_action);
77     return true;
78   }
79   return false;
80 }
81 
82 bool ProcessLaunchInfo::AppendDuplicateFileAction(int fd, int dup_fd) {
83   FileAction file_action;
84   if (file_action.Duplicate(fd, dup_fd)) {
85     AppendFileAction(file_action);
86     return true;
87   }
88   return false;
89 }
90 
91 bool ProcessLaunchInfo::AppendOpenFileAction(int fd, const FileSpec &file_spec,
92                                              bool read, bool write) {
93   FileAction file_action;
94   if (file_action.Open(fd, file_spec, read, write)) {
95     AppendFileAction(file_action);
96     return true;
97   }
98   return false;
99 }
100 
101 bool ProcessLaunchInfo::AppendSuppressFileAction(int fd, bool read,
102                                                  bool write) {
103   FileAction file_action;
104   if (file_action.Open(fd, FileSpec(FileSystem::DEV_NULL), read, write)) {
105     AppendFileAction(file_action);
106     return true;
107   }
108   return false;
109 }
110 
111 const FileAction *ProcessLaunchInfo::GetFileActionAtIndex(size_t idx) const {
112   if (idx < m_file_actions.size())
113     return &m_file_actions[idx];
114   return nullptr;
115 }
116 
117 const FileAction *ProcessLaunchInfo::GetFileActionForFD(int fd) const {
118   for (size_t idx = 0, count = m_file_actions.size(); idx < count; ++idx) {
119     if (m_file_actions[idx].GetFD() == fd)
120       return &m_file_actions[idx];
121   }
122   return nullptr;
123 }
124 
125 const FileSpec &ProcessLaunchInfo::GetWorkingDirectory() const {
126   return m_working_dir;
127 }
128 
129 void ProcessLaunchInfo::SetWorkingDirectory(const FileSpec &working_dir) {
130   m_working_dir = working_dir;
131 }
132 
133 const char *ProcessLaunchInfo::GetProcessPluginName() const {
134   return (m_plugin_name.empty() ? nullptr : m_plugin_name.c_str());
135 }
136 
137 void ProcessLaunchInfo::SetProcessPluginName(llvm::StringRef plugin) {
138   m_plugin_name = std::string(plugin);
139 }
140 
141 const FileSpec &ProcessLaunchInfo::GetShell() const { return m_shell; }
142 
143 void ProcessLaunchInfo::SetShell(const FileSpec &shell) {
144   m_shell = shell;
145   if (m_shell) {
146     FileSystem::Instance().ResolveExecutableLocation(m_shell);
147     m_flags.Set(lldb::eLaunchFlagLaunchInShell);
148   } else
149     m_flags.Clear(lldb::eLaunchFlagLaunchInShell);
150 }
151 
152 void ProcessLaunchInfo::SetLaunchInSeparateProcessGroup(bool separate) {
153   if (separate)
154     m_flags.Set(lldb::eLaunchFlagLaunchInSeparateProcessGroup);
155   else
156     m_flags.Clear(lldb::eLaunchFlagLaunchInSeparateProcessGroup);
157 }
158 
159 void ProcessLaunchInfo::SetShellExpandArguments(bool expand) {
160   if (expand)
161     m_flags.Set(lldb::eLaunchFlagShellExpandArguments);
162   else
163     m_flags.Clear(lldb::eLaunchFlagShellExpandArguments);
164 }
165 
166 void ProcessLaunchInfo::Clear() {
167   ProcessInfo::Clear();
168   m_working_dir.Clear();
169   m_plugin_name.clear();
170   m_shell.Clear();
171   m_flags.Clear();
172   m_file_actions.clear();
173   m_resume_count = 0;
174   m_listener_sp.reset();
175   m_hijack_listener_sp.reset();
176   m_scripted_process_class_name.clear();
177   m_scripted_process_dictionary_sp.reset();
178 }
179 
180 void ProcessLaunchInfo::SetMonitorProcessCallback(
181     const Host::MonitorChildProcessCallback &callback, bool monitor_signals) {
182   m_monitor_callback = callback;
183   m_monitor_signals = monitor_signals;
184 }
185 
186 bool ProcessLaunchInfo::NoOpMonitorCallback(lldb::pid_t pid, bool exited, int signal, int status) {
187   Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS);
188   LLDB_LOG(log, "pid = {0}, exited = {1}, signal = {2}, status = {3}", pid,
189            exited, signal, status);
190   return true;
191 }
192 
193 bool ProcessLaunchInfo::MonitorProcess() const {
194   if (m_monitor_callback && ProcessIDIsValid()) {
195     llvm::Expected<HostThread> maybe_thread =
196     Host::StartMonitoringChildProcess(m_monitor_callback, GetProcessID(),
197                                       m_monitor_signals);
198     if (!maybe_thread)
199       LLDB_LOG(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_HOST),
200                "failed to launch host thread: {}",
201                llvm::toString(maybe_thread.takeError()));
202     return true;
203   }
204   return false;
205 }
206 
207 void ProcessLaunchInfo::SetDetachOnError(bool enable) {
208   if (enable)
209     m_flags.Set(lldb::eLaunchFlagDetachOnError);
210   else
211     m_flags.Clear(lldb::eLaunchFlagDetachOnError);
212 }
213 
214 llvm::Error ProcessLaunchInfo::SetUpPtyRedirection() {
215   Log *log = GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS);
216   LLDB_LOG(log, "Generating a pty to use for stdin/out/err");
217 
218   int open_flags = O_RDWR | O_NOCTTY;
219 #if !defined(_WIN32)
220   // We really shouldn't be specifying platform specific flags that are
221   // intended for a system call in generic code.  But this will have to
222   // do for now.
223   open_flags |= O_CLOEXEC;
224 #endif
225   if (llvm::Error Err = m_pty->OpenFirstAvailablePrimary(open_flags))
226     return Err;
227 
228   const FileSpec secondary_file_spec(m_pty->GetSecondaryName());
229 
230   // Only use the secondary tty if we don't have anything specified for
231   // input and don't have an action for stdin
232   if (GetFileActionForFD(STDIN_FILENO) == nullptr)
233     AppendOpenFileAction(STDIN_FILENO, secondary_file_spec, true, false);
234 
235   // Only use the secondary tty if we don't have anything specified for
236   // output and don't have an action for stdout
237   if (GetFileActionForFD(STDOUT_FILENO) == nullptr)
238     AppendOpenFileAction(STDOUT_FILENO, secondary_file_spec, false, true);
239 
240   // Only use the secondary tty if we don't have anything specified for
241   // error and don't have an action for stderr
242   if (GetFileActionForFD(STDERR_FILENO) == nullptr)
243     AppendOpenFileAction(STDERR_FILENO, secondary_file_spec, false, true);
244   return llvm::Error::success();
245 }
246 
247 bool ProcessLaunchInfo::ConvertArgumentsForLaunchingInShell(
248     Status &error, bool will_debug, bool first_arg_is_full_shell_command,
249     uint32_t num_resumes) {
250   error.Clear();
251 
252   if (GetFlags().Test(eLaunchFlagLaunchInShell)) {
253     if (m_shell) {
254       std::string shell_executable = m_shell.GetPath();
255 
256       const char **argv = GetArguments().GetConstArgumentVector();
257       if (argv == nullptr || argv[0] == nullptr)
258         return false;
259       Args shell_arguments;
260       shell_arguments.AppendArgument(shell_executable);
261       const llvm::Triple &triple = GetArchitecture().GetTriple();
262       if (triple.getOS() == llvm::Triple::Win32 &&
263           !triple.isWindowsCygwinEnvironment())
264         shell_arguments.AppendArgument(llvm::StringRef("/C"));
265       else
266         shell_arguments.AppendArgument(llvm::StringRef("-c"));
267 
268       StreamString shell_command;
269       if (will_debug) {
270         // Add a modified PATH environment variable in case argv[0] is a
271         // relative path.
272         const char *argv0 = argv[0];
273         FileSpec arg_spec(argv0);
274         if (arg_spec.IsRelative()) {
275           // We have a relative path to our executable which may not work if we
276           // just try to run "a.out" (without it being converted to "./a.out")
277           FileSpec working_dir = GetWorkingDirectory();
278           // Be sure to put quotes around PATH's value in case any paths have
279           // spaces...
280           std::string new_path("PATH=\"");
281           const size_t empty_path_len = new_path.size();
282 
283           if (working_dir) {
284             new_path += working_dir.GetPath();
285           } else {
286             llvm::SmallString<64> cwd;
287             if (! llvm::sys::fs::current_path(cwd))
288               new_path += cwd;
289           }
290           std::string curr_path;
291           if (HostInfo::GetEnvironmentVar("PATH", curr_path)) {
292             if (new_path.size() > empty_path_len)
293               new_path += ':';
294             new_path += curr_path;
295           }
296           new_path += "\" ";
297           shell_command.PutCString(new_path);
298         }
299 
300         if (triple.getOS() != llvm::Triple::Win32 ||
301             triple.isWindowsCygwinEnvironment())
302           shell_command.PutCString("exec");
303 
304         // Only Apple supports /usr/bin/arch being able to specify the
305         // architecture
306         if (GetArchitecture().IsValid() && // Valid architecture
307             GetArchitecture().GetTriple().getVendor() ==
308                 llvm::Triple::Apple && // Apple only
309             GetArchitecture().GetCore() !=
310                 ArchSpec::eCore_x86_64_x86_64h) // Don't do this for x86_64h
311         {
312           shell_command.Printf(" /usr/bin/arch -arch %s",
313                                GetArchitecture().GetArchitectureName());
314           // Set the resume count to 2:
315           // 1 - stop in shell
316           // 2 - stop in /usr/bin/arch
317           // 3 - then we will stop in our program
318           SetResumeCount(num_resumes + 1);
319         } else {
320           // Set the resume count to 1:
321           // 1 - stop in shell
322           // 2 - then we will stop in our program
323           SetResumeCount(num_resumes);
324         }
325       }
326 
327       if (first_arg_is_full_shell_command) {
328         // There should only be one argument that is the shell command itself
329         // to be used as is
330         if (argv[0] && !argv[1])
331           shell_command.Printf("%s", argv[0]);
332         else
333           return false;
334       } else {
335         for (size_t i = 0; argv[i] != nullptr; ++i) {
336           std::string safe_arg = Args::GetShellSafeArgument(m_shell, argv[i]);
337           // Add a space to separate this arg from the previous one.
338           shell_command.PutCString(" ");
339           shell_command.PutCString(safe_arg);
340         }
341       }
342       shell_arguments.AppendArgument(shell_command.GetString());
343       m_executable = m_shell;
344       m_arguments = shell_arguments;
345       return true;
346     } else {
347       error.SetErrorString("invalid shell path");
348     }
349   } else {
350     error.SetErrorString("not launching in shell");
351   }
352   return false;
353 }
354