modules/spawn-process.js

   1 /**
   2  * (C) Copyright 2007-2008 Jeremy Maitin-Shepard
   3  *
   4  * Use, modification, and distribution are subject to the terms specified in the
   5  * COPYING file.
   6 **/
   7
   8 require("interactive.js");
   9 require("io.js");
  10
  11 const WINDOWS = (get_os() == "WINNT");
  12 const POSIX = !WINDOWS;
  13 const PATH = getenv("PATH").split(POSIX ? ":" : ";");
  14
  15 const path_component_regexp = POSIX ? /^[^\/]+$/ : /^[^\/\\]+$/;
  16
  17 function get_file_in_path(name) {
  18     if (name instanceof Ci.nsIFile) {
  19         if (name.exists())
  20             return name;
  21         return null;
  22     }
  23     var file = Cc["@mozilla.org/file/local;1"].createInstance(Ci.nsILocalFile);
  24     if (!path_component_regexp.test(name)) {
  25         // Absolute path
  26         try {
  27             file.initWithPath(name);
  28             if (file.exists())
  29                 return file;
  30         } catch (e) {}
  31         return null;
  32     } else {
  33         // Relative path
  34         for (var i = 0; i < PATH.length; ++i) {
  35             try {
  36                 file.initWithPath(PATH[i]);
  37                 file.appendRelativePath(name);
  38                 if (file.exists())
  39                     return file;
  40             } catch(e) {}
  41         }
  42     }
  43     return null;
  44 }
  45
  46 function spawn_process_internal(program, args, blocking) {
  47     var process = Cc["@mozilla.org/process/util;1"].createInstance(Ci.nsIProcess);
  48     process.init(get_file_in_path(program));
  49     return process.run(!!blocking, args, args.length);
  50 }
  51
  52 var PATH_programs = null;
  53 function get_shell_command_completer() {
  54     if (PATH_programs == null) {
  55         PATH_programs = [];
  56         var file = Cc["@mozilla.org/file/local;1"].createInstance(Ci.nsILocalFile);
  57         for (var i = 0; i < PATH.length; ++i) {
  58             try {
  59                 file.initWithPath(PATH[i]);
  60                 var entries = file.directoryEntries;
  61                 while (entries.hasMoreElements()) {
  62                     var entry = entries.getNext().QueryInterface(Ci.nsIFile);
  63                     PATH_programs.push(entry.leafName);
  64                 }
  65             } catch (e) {}
  66         }
  67         PATH_programs.sort();
  68     }
  69
  70     return prefix_completer($completions = PATH_programs,
  71                             $get_string = function (x) { return x; });
  72 }
  73
  74 // use default
  75 minibuffer_auto_complete_preferences["shell-command"] = null;
  76
  77 /* FIXME: support a relative or full path as well as PATH commands */
  78 define_keywords("$cwd");
  79 minibuffer.prototype.read_shell_command = function () {
  80     keywords(arguments, $history = "shell-command");
  81     var prompt = arguments.$prompt || "Shell command [" + arguments.$cwd + "]:";
  82     var result = yield this.read(
  83         $prompt = prompt,
  84         $history = "shell-command",
  85         $auto_complete = "shell-command",
  86         $select,
  87         $validator = function (x, m) {
  88             var s = x.replace(/^\s+|\s+$/g, '');
  89             if (s.length == 0) {
  90                 m.message("A blank shell command is not allowed.");
  91                 return false;
  92             }
  93             return true;
  94         },
  95         forward_keywords(arguments),
  96         $completer = get_shell_command_completer());
  97     yield co_return(result);
  98 }
  99
 100 const STDIN_FILENO = 0;
 101 const STDOUT_FILENO = 1;
 102 const STDERR_FILENO = 2;
 103
 104 var spawn_process_helper_default_fd_wait_timeout = 1000;
 105 var spawn_process_helper_setup_timeout = 2000;
 106 var spawn_process_helper_program = file_locator.get("CurProcD", Ci.nsIFile);
 107 spawn_process_helper_program.append("conkeror-spawn-helper");
 108
 109 /**
 110  * @param program_name
 111  *                 Specifies the full path to the program.
 112  * @param args
 113  *                 An array of strings to pass as the arguments to the program.
 114  *                 The first argument should be the program name.  These strings must not have
 115  *                 any NUL bytes in them.
 116  * @param working_dir
 117  *                 If non-null, switch to the specified path before running the program.
 118  * @param finished_callback
 119  *                 Called with a single argument, the exit code of the process, as returned by the wait system call.
 120  * @param failure_callback
 121  *                 Called with a single argument, an exception, if one occurs.
 122  * @param fds
 123  *                 If non-null, must be an object with only non-negative integer properties set.  Each such property
 124  *                 specifies that the corresponding file descriptor in the spaned process should be redirected.  Note that
 125  *                 0 corresponds to STDIN, 1 corresponds to STDOUT, and 2 corresponds to STDERR.  Note that every redirected
 126  *                 file descriptor can be used for both input and output, although STDIN, STDOUT, and STDERR are typically
 127  *                 used only unidirectionally.  Each property must be an object itself, with an input and/or output property
 128  *                 specifying callback functions that are called with an nsIAsyncInputStream or nsIAsyncOutputStream when the
 129  *                 stream for that file descriptor is available.
 130  * @param fd_wait_timeout
 131  *                 Specifies the number of milliseconds to wait for the file descriptor redirection sockets to be closed after
 132  *                 the control socket indicates the process has exited before they are closed forcefully.  A negative value
 133  *                 means to wait indefinitely.  If fd_wait_timeout is null, spawn_process_helper_default_fd_wait_timeout
 134  *                 is used instead.
 135  *
 136  *
 137  * @returns
 138  *                 A function that can be called to prematurely terminate the spawned process.
 139  */
 140 function spawn_process(program_name, args, working_dir,
 141                        success_callback, failure_callback, fds,
 142                        fd_wait_timeout) {
 143
 144     args = args.slice();
 145     if (args[0] == null)
 146         args[0] = (program_name instanceof Ci.nsIFile) ? program_name.path : program_name;
 147
 148     program_name = get_file_in_path(program_name).path;
 149
 150     const key_length = 100;
 151     const fd_spec_size = 15;
 152
 153     if (fds == null)
 154         fds = {};
 155
 156     if (fd_wait_timeout === undefined)
 157         fd_wait_timeout = spawn_process_helper_default_fd_wait_timeout;
 158
 159     var unregistered_transports = [];
 160     var registered_transports = [];
 161
 162     var server = null;
 163     var setup_timer = null;
 164
 165     const CONTROL_CONNECTED = 0;
 166     const CONTROL_SENDING_KEY = 1;
 167     const CONTROL_SENT_KEY = 2;
 168
 169     var control_state = CONTROL_CONNECTED;
 170     var terminate_pending = false;
 171
 172     var control_transport = null;
 173
 174     var control_binary_input_stream = null;
 175     var control_output_stream = null, control_input_stream = null;
 176     var exit_status = null;
 177
 178     var client_key = "";
 179     var server_key = "";
 180     // Make sure key does not have any 0 bytes in it.
 181     for (let i = 0; i < key_length; ++i) client_key += String.fromCharCode(Math.floor(Math.random() * 255) + 1);
 182
 183     // Make sure key does not have any 0 bytes in it.
 184     for (let i = 0; i < key_length; ++i) server_key += String.fromCharCode(Math.floor(Math.random() * 255) + 1);
 185
 186     var key_file_fd_data = "";
 187
 188     // This is the total number of redirected file descriptors.
 189     var total_client_fds = 0;
 190
 191     // This is the total number of redirected file descriptors that will use a socket connection.
 192     var total_fds = 0;
 193
 194     for (let i in fds) {
 195         if (fds.hasOwnProperty(i)) {
 196             key_file_fd_data += i + "\0";
 197             let fd = fds[i];
 198             if ('file' in fd) {
 199                 if (fd.perms == null)
 200                     fd.perms = 0666;
 201                 key_file_fd_data += fd.file + "\0" + fd.mode + "\0" + fd.perms + "\0";
 202                 delete fds[i]; // Remove it from fds, as we won't need to work with it anymore
 203             } else
 204                 ++total_fds;
 205             ++total_client_fds;
 206         }
 207     }
 208     var key_file_data = client_key + "\0" + server_key + "\0" + program_name + "\0" +
 209         (working_dir != null ? working_dir : "") + "\0" +
 210         args.length + "\0" +
 211         args.join("\0") + "\0" +
 212         total_client_fds + "\0" + key_file_fd_data;
 213
 214     function fail(e) {
 215         if (!terminate_pending) {
 216             terminate();
 217             if (failure_callback)
 218                 failure_callback(e);
 219         }
 220     }
 221
 222     function cleanup_server() {
 223         if (server) {
 224             server.close();
 225             server = null;
 226         }
 227         for (let i in unregistered_transports) {
 228             unregistered_transports[i].close(0);
 229             delete unregistered_transports[i];
 230         }
 231     }
 232
 233     function cleanup_fd_sockets() {
 234         for (let i in registered_transports) {
 235             registered_transports[i].transport.close(0);
 236             delete registered_transports[i];
 237         }
 238     }
 239
 240     function cleanup_control() {
 241         if (control_transport) {
 242             control_binary_input_stream.close();
 243             control_binary_input_stream = null;
 244             control_transport.close(0);
 245             control_transport = null;
 246             control_input_stream = null;
 247             control_output_stream = null;
 248         }
 249     }
 250
 251     function control_send_terminate() {
 252         control_input_stream = null;
 253         control_binary_input_stream.close();
 254         control_binary_input_stream = null;
 255         async_binary_write(control_output_stream, "\0", function () {
 256             control_output_stream = null;
 257             control_transport.close(0);
 258             control_transport = null;
 259         });
 260     }
 261
 262     function terminate() {
 263         if (terminate_pending)
 264             return exit_status;
 265         terminate_pending = true;
 266         if (setup_timer) {
 267             setup_timer.cancel();
 268             setup_timer = null;
 269         }
 270         cleanup_server();
 271         cleanup_fd_sockets();
 272         if (control_transport) {
 273             switch (control_state) {
 274             case CONTROL_SENT_KEY:
 275                 control_send_terminate();
 276                 break;
 277             case CONTROL_CONNECTED:
 278                 cleanup_control();
 279                 break;
 280                 /**
 281                  * case CONTROL_SENDING_KEY: in this case once the key
 282                  * is sent, the terminate_pending flag will be noticed
 283                  * and control_send_terminate will be called, so nothing
 284                  * more needs to be done here.
 285                  */
 286             }
 287         }
 288         return exit_status;
 289     }
 290
 291     function finished() {
 292         // Only call success_callback if terminate was not already called
 293         if (!terminate_pending) {
 294             terminate();
 295             if (success_callback)
 296                 success_callback(exit_status);
 297         }
 298     }
 299
 300     // Create server socket to listen for connections from the external helper program
 301     try {
 302         server = Cc['@mozilla.org/network/server-socket;1'].createInstance(Ci.nsIServerSocket);
 303
 304         var key_file = get_temporary_file("spawn_process_key.dat");
 305
 306         write_binary_file(key_file, key_file_data);
 307         server.init(-1 /* choose a port automatically */,
 308                     true /* bind to localhost only */,
 309                     -1 /* select backlog size automatically */);
 310
 311         setup_timer = call_after_timeout(function () {
 312             setup_timer = null;
 313             if (control_state != CONTROL_SENT_KEY)
 314                 fail("setup timeout");
 315         }, spawn_process_helper_setup_timeout);
 316
 317
 318         function wait_for_fd_sockets() {
 319             var remaining_streams = total_fds * 2;
 320             var timer = null;
 321             function handler() {
 322                 if (remaining_streams != null) {
 323                     --remaining_streams;
 324                     if (remaining_streams == 0) {
 325                         if (timer)
 326                             timer.cancel();
 327                         finished();
 328                     }
 329                 }
 330             }
 331             for each (let f in registered_transports) {
 332                 input_stream_async_wait(f.input, handler, false /* wait for closure */);
 333                 output_stream_async_wait(f.output, handler, false /* wait for closure */);
 334             }
 335             if (fd_wait_timeout != null) {
 336                 timer = call_after_timeout(function() {
 337                     remaining_streams = null;
 338                     finished();
 339                 }, fd_wait_timeout);
 340             }
 341         }
 342
 343         var control_data = "";
 344
 345         function handle_control_input() {
 346             if (terminate_pending)
 347                 return;
 348             try {
 349                 let avail = control_input_stream.available();
 350                 if (avail > 0) {
 351                     control_data += control_binary_input_stream.readBytes(avail);
 352                     var off = control_data.indexOf("\0");
 353                     if (off >= 0) {
 354                         let message = control_data.substring(0,off);
 355                         exit_status = parseInt(message);
 356                         cleanup_control();
 357                         /* wait for all fd sockets to close? */
 358                         if (total_fds > 0)
 359                             wait_for_fd_sockets();
 360                         else
 361                             finished();
 362                         return;
 363                     }
 364                 }
 365                 input_stream_async_wait(control_input_stream, handle_control_input);
 366             } catch (e) {
 367                 // Control socket closed: terminate
 368                 cleanup_control();
 369                 fail(e);
 370             }
 371         }
 372
 373         var registered_fds = 0;
 374
 375         server.asyncListen(
 376             {
 377                 onSocketAccepted: function (server, transport) {
 378                     unregistered_transports.push(transport);
 379                     function remove_from_unregistered() {
 380                         var i;
 381                         i = unregistered_transports.indexOf(transport);
 382                         if (i >= 0) {
 383                             unregistered_transports.splice(i, 1);
 384                             return true;
 385                         }
 386                         return false;
 387                     }
 388                     function close() {
 389                         transport.close(0);
 390                         remove_from_unregistered();
 391                     }
 392                     var received_data = "";
 393                     var header_size = key_length + fd_spec_size;
 394
 395                     var in_stream, bin_stream, out_stream;
 396
 397                     function handle_input() {
 398                         if (terminate_pending)
 399                             return;
 400                         try {
 401                             let remaining = header_size - received_data.length;
 402                             let avail = in_stream.available();
 403                             if (avail > 0) {
 404                                 if (avail > remaining)
 405                                     avail = remaining;
 406                                 received_data += bin_stream.readBytes(avail);
 407                             }
 408                             if (received_data.length < header_size) {
 409                                 input_stream_async_wait(in_stream, handle_input);
 410                                 return;
 411                             } else {
 412                                 if (received_data.substring(0, key_length) != client_key)
 413                                     throw "Invalid key";
 414                             }
 415                         } catch (e) {
 416                             close();
 417                         }
 418                         try {
 419                             var fdspec = received_data.substring(key_length);
 420                             if (fdspec.charCodeAt(0) == 0) {
 421
 422                                 // This is the control connection
 423                                 if (control_transport)
 424                                     throw "Control transport already exists";
 425                                 control_transport = transport;
 426                                 control_output_stream = out_stream;
 427                                 control_input_stream = in_stream;
 428                                 control_binary_input_stream = bin_stream;
 429                                 remove_from_unregistered();
 430                             } else {
 431                                 var fd = parseInt(fdspec);
 432                                 if (!fds.hasOwnProperty(fd) || (fd in registered_transports))
 433                                     throw "Invalid fd";
 434                                 bin_stream.close();
 435                                 bin_stream = null;
 436                                 registered_transports[fd] = {transport: transport,
 437                                                              input: in_stream,
 438                                                              output: out_stream};
 439                                 ++registered_fds;
 440                             }
 441                             if (control_transport && registered_fds == total_fds) {
 442                                 cleanup_server();
 443                                 control_state = CONTROL_SENDING_KEY;
 444                                 async_binary_write(control_output_stream, server_key,
 445                                                    function () {
 446                                                        control_state = CONTROL_SENT_KEY;
 447                                                        if (setup_timer) {
 448                                                            setup_timer.cancel();
 449                                                            setup_timer = null;
 450                                                        }
 451                                                        if (terminate_pending) {
 452                                                            control_send_terminate();
 453                                                        } else {
 454                                                            for (let i in fds) {
 455                                                                let f = fds[i];
 456                                                                let t = registered_transports[i];
 457                                                                if ('input' in f)
 458                                                                    f.input(t.input);
 459                                                                if ('output' in f)
 460                                                                    f.output(t.output);
 461                                                            }
 462                                                        }
 463                                                    });
 464                                 input_stream_async_wait(control_input_stream, handle_control_input);
 465                             }
 466                         } catch (e) {
 467                             fail(e);
 468                         }
 469                     }
 470
 471                     try {
 472                         in_stream = transport.openInputStream(Ci.nsITransport.OPEN_NON_BLOCKING, 0, 0);
 473                         out_stream = transport.openOutputStream(Ci.nsITransport.OPEN_NON_BLOCKING, 0, 0);
 474                         bin_stream = binary_input_stream(in_stream);
 475                         input_stream_async_wait(in_stream, handle_input);
 476                     } catch (e) {
 477                         close();
 478                     }
 479                 },
 480                 onStopListening: function (s, status) {
 481                 }
 482             });
 483
 484         spawn_process_internal(spawn_process_helper_program, [key_file.path, server.port], false);
 485         return terminate;
 486     } catch (e) {
 487         terminate();
 488
 489         if ((e instanceof Ci.nsIException) && e.result == Cr.NS_ERROR_INVALID_POINTER) {
 490             if (WINDOWS)
 491                 throw new Error("Error spawning process: not yet supported on MS Windows");
 492             else
 493                 throw new Error("Error spawning process: conkeror-spawn-helper not found; try running \"make\"");
 494         }
 495         // Allow the exception to propagate to the caller
 496         throw e;
 497     }
 498 }
 499
 500 /**
 501  * spawn_process_blind: spawn a process and forget about it
 502  */
 503 define_keywords("$cwd", "$fds");
 504 function spawn_process_blind(program_name, args) {
 505     keywords(arguments);
 506     /* Check if we can use spawn_process_internal */
 507     var cwd = arguments.$cwd;
 508     var fds = arguments.$fds;
 509     if (cwd == null && fds == null && args[0] == null)
 510         spawn_process_internal(program_name, args.slice(1));
 511     else {
 512         spawn_process(program_name, args, cwd,
 513                       null /* success callback */,
 514                       null /* failure callback */,
 515                       fds);
 516     }
 517 }
 518
 519
 520 //  Keyword arguments: $cwd, $fds
 521 function spawn_and_wait_for_process(program_name, args) {
 522     keywords(arguments);
 523     var cc = yield CONTINUATION;
 524     spawn_process(program_name, args, arguments.$cwd,
 525                   cc, cc.throw,
 526                   arguments.$fds);
 527     var result = yield SUSPEND;
 528     yield co_return(result);
 529 }
 530
 531 // Keyword arguments: $cwd, $fds
 532 function shell_command_blind(cmd) {
 533     keywords(arguments);
 534     /* Check if we can use spawn_process_internal */
 535     var cwd = arguments.$cwd;
 536     var fds = arguments.$fds;
 537
 538     var program_name;
 539     var args;
 540
 541     if (POSIX) {
 542         var full_cmd;
 543         if (cwd)
 544             full_cmd = "cd \"" + shell_quote(cwd) + "\"; " + cmd;
 545         else
 546             full_cmd = cmd;
 547         program_name = getenv("SHELL") || "/bin/sh";
 548         args = [null, "-c", full_cmd];
 549     } else {
 550         var full_cmd;
 551         if (cwd) {
 552             full_cmd = "";
 553             if (cwd.match(/[a-z]:/i)) {
 554                 full_cmd += cwd.substring(0,2) + " && ";
 555             }
 556             full_cmd += "cd \"" + shell_quote(cwd) + "\" && " + cmd;
 557         } else
 558             full_cmd = cmd;
 559
 560         /* Need to convert the single command-line into a list of
 561             * arguments that will then get converted back into a *
 562             command-line by Mozilla. */
 563         var out = [null, "/C"];
 564         var cur_arg = "";
 565         var quoting = false;
 566         for (var i = 0; i < full_cmd.length; ++i) {
 567             var ch = full_cmd[i];
 568             if (ch == " ") {
 569                 if (quoting) {
 570                     cur_arg += ch;
 571                 } else {
 572                     out.push(cur_arg);
 573                     cur_arg = "";
 574                 }
 575                 continue;
 576             }
 577             if (ch == "\"") {
 578                 quoting = !quoting;
 579                 continue;
 580             }
 581             cur_arg += ch;
 582         }
 583         if (cur_arg.length > 0)
 584             out.push(cur_arg);
 585         program_name = "cmd.exe";
 586         args = out;
 587     }
 588     spawn_process_blind(program_name, args, $fds = arguments.$fds);
 589 }
 590
 591 function substitute_shell_command_argument(cmdline, argument) {
 592     if (!cmdline.match("{}"))
 593         return cmdline + " \"" + shell_quote(argument) + "\"";
 594     else
 595         return cmdline.replace("{}", "\"" + shell_quote(argument) + "\"");
 596 }
 597
 598 function shell_command_with_argument_blind(command, arg) {
 599     shell_command_blind(substitute_shell_command_argument(command, arg), forward_keywords(arguments));
 600 }
 601
 602 // Keyword arguments: $cwd, $fds
 603 function shell_command(command) {
 604     if (!POSIX)
 605         throw new Error("shell_command: Your OS is not yet supported");
 606     var result = yield spawn_and_wait_for_process(getenv("SHELL") || "/bin/sh",
 607                                                   [null, "-c", command],
 608                                                   forward_keywords(arguments));
 609     yield co_return(result);
 610 }
 611
 612 function shell_command_with_argument(command, arg) {
 613     yield co_return((yield shell_command(substitute_shell_command_argument(command, arg), forward_keywords(arguments))));
 614 }