/* 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 #include #include #include #include #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 &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; /* Workaround for gcc 5.X issue related to the use of STL (string and list) with muliple fork calls. * * The char* pointers retrieved from the elements of parameter "arguments" are no longer valid after * a second fork is called. "arguments" was created in the parent of the current child process. * * The only solution is to copy the elements of "arguments" parameter in a local string array on this * child process and then use char* pointers retrieved from this local copies before calling fork. * * gcc 4.x doesn't suffer from this issue. * */ string argsCopy[array_capacity (args)]; if (!execFunctor) { argsCopy[argIndex++] = processName; } foreach (const string &arg, arguments) { argsCopy[argIndex++] = arg; } for (int i = 0; i < argIndex; i++) { args[i] = const_cast (argsCopy[i].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 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 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 deserializedObject; Exception *deserializedException = nullptr; try { shared_ptr stream (new MemoryStream (ConstBufferPtr ((byte *) &exOutput[0], exOutput.size()))); deserializedObject.reset (Serializable::DeserializeNew (stream)); deserializedException = dynamic_cast (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; } } a> 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291