/* Derived from source code of TrueCrypt 7.1a, which is Copyright (c) 2008-2012 TrueCrypt Developers Association and which is governed by the TrueCrypt License 3.0. Modifications and additions to the original source code (contained in this file) and all other portions of this file are Copyright (c) 2013-2017 IDRIX and are governed by the Apache License 2.0 the full text of which is contained in the file License.txt included in VeraCrypt 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 VeraCrypt { 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()); for (list<string>::const_iterator it = arguments.begin(); it != arguments.end(); it++) { args[argIndex++] = const_cast <char*> (it->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; } }