From 3cb7fdea950dd2d0377f0d9ad8a88fcb7c48b842 Mon Sep 17 00:00:00 2001
From: Jedidiah Barber <contact@jedbarber.id.au>
Date: Wed, 14 Jul 2021 11:27:03 +1200
Subject: Initial mirror commit

---
 Platform/Unix/Process.cpp | 202 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 202 insertions(+)
 create mode 100644 Platform/Unix/Process.cpp

(limited to 'Platform/Unix/Process.cpp')

diff --git a/Platform/Unix/Process.cpp b/Platform/Unix/Process.cpp
new file mode 100644
index 0000000..d99dff8
--- /dev/null
+++ b/Platform/Unix/Process.cpp
@@ -0,0 +1,202 @@
+/*
+ Copyright (c) 2008 TrueCrypt Developers Association. All rights reserved.
+
+ Governed by the TrueCrypt License 3.0 the full text of which is contained in
+ the file License.txt included in TrueCrypt binary and source code distribution
+ packages.
+*/
+
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include "Process.h"
+#include "Platform/Exception.h"
+#include "Platform/FileStream.h"
+#include "Platform/ForEach.h"
+#include "Platform/MemoryStream.h"
+#include "Platform/SystemException.h"
+#include "Platform/StringConverter.h"
+#include "Platform/Unix/Pipe.h"
+#include "Platform/Unix/Poller.h"
+
+namespace TrueCrypt
+{
+	string Process::Execute (const string &processName, const list <string> &arguments, int timeOut, ProcessExecFunctor *execFunctor, const Buffer *inputData)
+	{
+		char *args[32];
+		if (array_capacity (args) <= arguments.size())
+			throw ParameterTooLarge (SRC_POS);
+
+#if 0
+		stringstream dbg;
+		dbg << "exec " << processName;
+		foreach (const string &at, arguments)
+			dbg << " " << at;
+		trace_msg (dbg.str());
+#endif
+
+		Pipe inPipe, outPipe, errPipe, exceptionPipe;
+
+		int forkedPid = fork();
+		throw_sys_if (forkedPid == -1);
+
+		if (forkedPid == 0)
+		{
+			try
+			{
+				try
+				{
+					int argIndex = 0;
+					if (!execFunctor)
+						args[argIndex++] = const_cast <char*> (processName.c_str());
+
+					foreach (const string &arg, arguments)
+					{
+						args[argIndex++] = const_cast <char*> (arg.c_str());
+					}
+					args[argIndex] = nullptr;
+
+					if (inputData)
+					{
+						throw_sys_if (dup2 (inPipe.GetReadFD(), STDIN_FILENO) == -1);
+					}
+					else
+					{
+						inPipe.Close();
+						int nullDev = open ("/dev/null", 0);
+						throw_sys_sub_if (nullDev == -1, "/dev/null");
+						throw_sys_if (dup2 (nullDev, STDIN_FILENO) == -1);
+					}
+
+					throw_sys_if (dup2 (outPipe.GetWriteFD(), STDOUT_FILENO) == -1);
+					throw_sys_if (dup2 (errPipe.GetWriteFD(), STDERR_FILENO) == -1);
+					exceptionPipe.GetWriteFD();
+
+					if (execFunctor)
+					{
+						(*execFunctor)(argIndex, args);
+					}
+					else
+					{
+						execvp (args[0], args);
+						throw SystemException (SRC_POS, args[0]);
+					}
+				}
+				catch (Exception &)
+				{
+					throw;
+				}
+				catch (exception &e)
+				{
+					throw ExternalException (SRC_POS, StringConverter::ToExceptionString (e));
+				}
+				catch (...)
+				{
+					throw UnknownException (SRC_POS);
+				}
+			}
+			catch (Exception &e)
+			{
+				try
+				{
+					shared_ptr <Stream> outputStream (new FileStream (exceptionPipe.GetWriteFD()));
+					e.Serialize (outputStream);
+				}
+				catch (...) { }
+			}
+
+			_exit (1);
+		}
+
+		throw_sys_if (fcntl (outPipe.GetReadFD(), F_SETFL, O_NONBLOCK) == -1);
+		throw_sys_if (fcntl (errPipe.GetReadFD(), F_SETFL, O_NONBLOCK) == -1);
+		throw_sys_if (fcntl (exceptionPipe.GetReadFD(), F_SETFL, O_NONBLOCK) == -1);
+
+		vector <char> buffer (4096), stdOutput (4096), errOutput (4096), exOutput (4096);
+		buffer.clear ();
+		stdOutput.clear ();
+		errOutput.clear ();
+		exOutput.clear ();
+
+		Poller poller (outPipe.GetReadFD(), errPipe.GetReadFD(), exceptionPipe.GetReadFD());
+		int status, waitRes;
+
+		if (inputData)
+			throw_sys_if (write (inPipe.GetWriteFD(), inputData->Ptr(), inputData->Size()) == -1 && errno != EPIPE);
+
+		inPipe.Close();
+
+		int timeTaken = 0;
+		do
+		{
+			const int pollTimeout = 200;
+			try
+			{
+				ssize_t bytesRead = 0;
+				foreach (int fd, poller.WaitForData (pollTimeout))
+				{
+					bytesRead = read (fd, &buffer[0], buffer.capacity());
+					if (bytesRead > 0)
+					{
+						if (fd == outPipe.GetReadFD())
+							stdOutput.insert (stdOutput.end(), buffer.begin(), buffer.begin() + bytesRead);
+						else if (fd == errPipe.GetReadFD())
+							errOutput.insert (errOutput.end(), buffer.begin(), buffer.begin() + bytesRead);
+						else if (fd == exceptionPipe.GetReadFD())
+							exOutput.insert (exOutput.end(), buffer.begin(), buffer.begin() + bytesRead);
+					}
+				}
+
+				if (bytesRead == 0)
+				{
+					waitRes = waitpid (forkedPid, &status, 0);
+					break;
+				}
+			}
+			catch (TimeOut&)
+			{
+				timeTaken += pollTimeout;
+				if (timeOut >= 0 && timeTaken >= timeOut)
+					throw;
+			}
+		} while ((waitRes = waitpid (forkedPid, &status, WNOHANG)) == 0);
+		throw_sys_if (waitRes == -1);
+
+		if (!exOutput.empty())
+		{
+			auto_ptr <Serializable> deserializedObject;
+			Exception *deserializedException = nullptr;
+
+			try
+			{
+				shared_ptr <Stream> stream (new MemoryStream (ConstBufferPtr ((byte *) &exOutput[0], exOutput.size())));
+				deserializedObject.reset (Serializable::DeserializeNew (stream));
+				deserializedException = dynamic_cast <Exception*> (deserializedObject.get());
+			}
+			catch (...)	{ }
+
+			if (deserializedException)
+				deserializedException->Throw();
+		}
+
+		int exitCode = (WIFEXITED (status) ? WEXITSTATUS (status) : 1);
+		if (exitCode != 0)
+		{
+			string strErrOutput;
+
+			if (!errOutput.empty())
+				strErrOutput.insert (strErrOutput.begin(), errOutput.begin(), errOutput.end());
+
+			throw ExecutedProcessFailed (SRC_POS, processName, exitCode, strErrOutput);
+		}
+
+		string strOutput;
+
+		if (!stdOutput.empty())
+			strOutput.insert (strOutput.begin(), stdOutput.begin(), stdOutput.end());
+
+		return strOutput;
+	}
+}
-- 
cgit