nonnacl_util/linux/sel_ldr_launcher_linux.cc

   1 /*
   2  * Copyright 2008, Google Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met:
   8  *
   9  *     * Redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer.
  11  *     * Redistributions in binary form must reproduce the above
  12  * copyright notice, this list of conditions and the following disclaimer
  13  * in the documentation and/or other materials provided with the
  14  * distribution.
  15  *     * Neither the name of Google Inc. nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32
  33 #include <sys/types.h>
  34 #include <sys/wait.h>
  35
  36 #include <fcntl.h>
  37 #include <libgen.h>
  38 #include <signal.h>
  39 #include <stdio.h>
  40 #include <string.h>
  41 #include <sys/param.h>
  42 #include <unistd.h>
  43
  44 #include "native_client/nonnacl_util/sel_ldr_launcher.h"
  45
  46 namespace nacl {
  47
  48 SelLdrLauncher::~SelLdrLauncher() {
  49
  50     // When used with the browser's invalidate functionality this
  51     // causes occasional deadlocks in nacl modules that have threads that have
  52     // not terminated when the main thread is being terminated.
  53     // TODO: Implement a whole-module shutdown RPC.
  54 #if 0
  55   if (child_ != kInvalidHandle) {
  56     int status;
  57     waitpid(child_, &status, 0);
  58   }
  59 #endif
  60 }
  61
  62 bool SelLdrLauncher::Start(const char* application_name,
  63                            int imc_fd,
  64                            int sel_ldr_argc,
  65                            const char* sel_ldr_argv[],
  66                            int application_argc,
  67                            const char* application_argv[]) {
  68   Handle pair[2];
  69   const char* const kNaclSelLdrBasename = "sel_ldr";
  70   const char* plugin_dirname = GetPluginDirname();
  71   char sel_ldr_path[MAXPATHLEN + 1];
  72
  73   application_name_ = application_name;
  74
  75   if (NULL == plugin_dirname) {
  76     printf("GetPluginDirname returned NULL -- load failed\n");
  77     return false;
  78   }
  79   // Uncomment to turn on the sandbox, or set this in your environment
  80   // TODO:  Turn this on by default.
  81   //
  82   // setenv("NACL_ENABLE_OUTER_SANDBOX");
  83   snprintf(sel_ldr_path,
  84            sizeof(sel_ldr_path),
  85            "%s/%s",
  86            plugin_dirname,
  87            kNaclSelLdrBasename);
  88   printf("starting: %s %s\n", sel_ldr_path, application_name);
  89
  90   if (SocketPair(pair) == -1) {
  91     return false;
  92   }
  93
  94   // Set environment variable to keep the Mac sel_ldr from stealing the focus.
  95   // TODO: change this to use a command line parameter rather than env.
  96   setenv("NACL_LAUNCHED_FROM_BROWSER", "1", 0);
  97   // Fork the sel_ldr process.
  98   child_ = fork();
  99   if (child_ == -1) {
 100     printf("fork failed\n");
 101     Close(pair[0]);
 102     Close(pair[1]);
 103     return false;
 104   }
 105
 106   if (child_ == 0) {
 107     Close(pair[0]);
 108     BuildArgv(sel_ldr_path,
 109               application_name,
 110               imc_fd,
 111               pair[1],
 112               sel_ldr_argc,
 113               sel_ldr_argv,
 114               application_argc,
 115               application_argv);
 116     execv(sel_ldr_path, const_cast<char **>(argv_));
 117     perror("exec");
 118     printf("exec failed\n");
 119     _exit(EXIT_FAILURE);
 120   }
 121   Close(pair[1]);
 122   channel_ = pair[0];
 123
 124   int flags = fcntl(channel_, F_GETFD);
 125   if (flags != -1) {
 126     flags |= FD_CLOEXEC;
 127     fcntl(channel_, F_SETFD, flags);
 128   }
 129   return true;
 130 }
 131
 132 }  // namespace nacl