src/tools/dcpomatic_disk_writer.cc

   1 /*
   2     Copyright (C) 2019-2021 Carl Hetherington <cth@carlh.net>
   3
   4     This file is part of DCP-o-matic.
   5
   6     DCP-o-matic is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     DCP-o-matic is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 */
  20
  21
  22 #include "lib/compose.hpp"
  23 #include "lib/cross.h"
  24 #include "lib/dcpomatic_log.h"
  25 #include "lib/digester.h"
  26 #include "lib/disk_writer_messages.h"
  27 #include "lib/exceptions.h"
  28 #include "lib/ext.h"
  29 #include "lib/file_log.h"
  30 #include "lib/state.h"
  31 #include "lib/nanomsg.h"
  32 #include "lib/util.h"
  33 #include "lib/version.h"
  34 #include <dcp/warnings.h>
  35
  36 #ifdef DCPOMATIC_POSIX
  37 #include <sys/ioctl.h>
  38 #include <sys/types.h>
  39 #include <sys/stat.h>
  40 #endif
  41
  42 #ifdef DCPOMATIC_OSX
  43 #include "lib/stdout_log.h"
  44 #undef nil
  45 extern "C" {
  46 #include <lwext4/file_dev.h>
  47 }
  48 #include <unistd.h>
  49 #include <xpc/xpc.h>
  50 #endif
  51
  52 #ifdef DCPOMATIC_LINUX
  53 #include <polkit/polkit.h>
  54 #include <poll.h>
  55 #endif
  56
  57 #ifdef DCPOMATIC_WINDOWS
  58 extern "C" {
  59 #include <lwext4/file_windows.h>
  60 }
  61 #endif
  62
  63 LIBDCP_DISABLE_WARNINGS
  64 #include <glibmm.h>
  65 LIBDCP_ENABLE_WARNINGS
  66
  67 #include <unistd.h>
  68 #include <sys/types.h>
  69 #include <boost/filesystem.hpp>
  70 #include <boost/algorithm/string.hpp>
  71 #include <iostream>
  72
  73
  74 using std::cin;
  75 using std::min;
  76 using std::string;
  77 using std::runtime_error;
  78 using std::exception;
  79 using std::vector;
  80 using boost::optional;
  81
  82
  83 #define SHORT_TIMEOUT 100
  84 #define LONG_TIMEOUT 2000
  85
  86
  87 #ifdef DCPOMATIC_LINUX
  88 static PolkitAuthority* polkit_authority = nullptr;
  89 #endif
  90 static Nanomsg* nanomsg = nullptr;
  91
  92
  93 #ifdef DCPOMATIC_LINUX
  94 void
  95 polkit_callback (GObject *, GAsyncResult* res, gpointer data)
  96 {
  97         auto parameters = reinterpret_cast<std::pair<std::function<void ()>, std::function<void ()>>*> (data);
  98         GError* error = nullptr;
  99         auto result = polkit_authority_check_authorization_finish (polkit_authority, res, &error);
 100         bool failed = false;
 101
 102         if (error) {
 103                 LOG_DISK("polkit authority check failed (check_authorization_finish failed with %1)", error->message);
 104                 failed = true;
 105         } else {
 106                 if (polkit_authorization_result_get_is_authorized(result)) {
 107                         parameters->first();
 108                 } else {
 109                         failed = true;
 110                         if (polkit_authorization_result_get_is_challenge(result)) {
 111                                 LOG_DISK_NC("polkit authority check failed (challenge)");
 112                         } else {
 113                                 LOG_DISK_NC("polkit authority check failed (not authorized)");
 114                         }
 115                 }
 116         }
 117
 118         if (failed) {
 119                 parameters->second();
 120         }
 121
 122         delete parameters;
 123
 124         if (result) {
 125                 g_object_unref (result);
 126         }
 127 }
 128 #endif
 129
 130
 131 #ifdef DCPOMATIC_LINUX
 132 void request_privileges (string action, std::function<void ()> granted, std::function<void ()> denied)
 133 #else
 134 void request_privileges (string, std::function<void ()> granted, std::function<void ()>)
 135 #endif
 136 {
 137 #ifdef DCPOMATIC_LINUX
 138         polkit_authority = polkit_authority_get_sync (0, 0);
 139         auto subject = polkit_unix_process_new_for_owner (getppid(), 0, -1);
 140
 141         auto parameters = new std::pair<std::function<void ()>, std::function<void ()>>(granted, denied);
 142         polkit_authority_check_authorization (
 143                 polkit_authority, subject, action.c_str(), 0, POLKIT_CHECK_AUTHORIZATION_FLAGS_ALLOW_USER_INTERACTION, 0, polkit_callback, parameters
 144                 );
 145 #else
 146         granted ();
 147 #endif
 148 }
 149
 150
 151 bool
 152 idle ()
 153 try
 154 {
 155         using namespace boost::algorithm;
 156
 157         auto s = nanomsg->receive (0);
 158         if (!s) {
 159                 return true;
 160         }
 161
 162         LOG_DISK("Writer receives command: %1", *s);
 163
 164         if (*s == DISK_WRITER_QUIT) {
 165                 exit (EXIT_SUCCESS);
 166         } else if (*s == DISK_WRITER_PING) {
 167                 nanomsg->send(DISK_WRITER_PONG "\n", LONG_TIMEOUT);
 168         } else if (*s == DISK_WRITER_UNMOUNT) {
 169                 auto xml_head = nanomsg->receive (LONG_TIMEOUT);
 170                 auto xml_body = nanomsg->receive (LONG_TIMEOUT);
 171                 if (!xml_head || !xml_body) {
 172                         LOG_DISK_NC("Failed to receive unmount request");
 173                         throw CommunicationFailedError ();
 174                 }
 175                 auto xml = *xml_head + *xml_body;
 176                 request_privileges (
 177                         "com.dcpomatic.write-drive",
 178                         [xml]() {
 179                                 bool const success = Drive(xml).unmount();
 180                                 if (!nanomsg->send(success ? (DISK_WRITER_OK "\n") : (DISK_WRITER_ERROR "\n"), LONG_TIMEOUT)) {
 181                                         LOG_DISK_NC("CommunicationFailedError in unmount_finished");
 182                                         throw CommunicationFailedError ();
 183                                 }
 184                         },
 185                         []() {
 186                                 if (!nanomsg->send(DISK_WRITER_ERROR "\n", LONG_TIMEOUT)) {
 187                                         LOG_DISK_NC("CommunicationFailedError in unmount_finished");
 188                                         throw CommunicationFailedError ();
 189                                 }
 190                         });
 191         } else if (*s == DISK_WRITER_WRITE) {
 192                 auto dcp_path_opt = nanomsg->receive (LONG_TIMEOUT);
 193                 auto device_opt = nanomsg->receive (LONG_TIMEOUT);
 194                 if (!dcp_path_opt || !device_opt) {
 195                         LOG_DISK_NC("Failed to receive write request");
 196                         throw CommunicationFailedError();
 197                 }
 198
 199                 auto dcp_path = *dcp_path_opt;
 200                 auto device = *device_opt;
 201
 202                 /* Do some basic sanity checks; this is a bit belt-and-braces but it can't hurt... */
 203
 204 #ifdef DCPOMATIC_OSX
 205                 if (!starts_with(device, "/dev/disk")) {
 206                         LOG_DISK ("Will not write to %1", device);
 207                         nanomsg->send(DISK_WRITER_ERROR "\nRefusing to write to this drive\n1\n", LONG_TIMEOUT);
 208                         return true;
 209                 }
 210 #endif
 211 #ifdef DCPOMATIC_LINUX
 212                 if (!starts_with(device, "/dev/sd") && !starts_with(device, "/dev/hd")) {
 213                         LOG_DISK ("Will not write to %1", device);
 214                         nanomsg->send(DISK_WRITER_ERROR "\nRefusing to write to this drive\n1\n", LONG_TIMEOUT);
 215                         return true;
 216                 }
 217 #endif
 218 #ifdef DCPOMATIC_WINDOWS
 219                 if (!starts_with(device, "\\\\.\\PHYSICALDRIVE")) {
 220                         LOG_DISK ("Will not write to %1", device);
 221                         nanomsg->send(DISK_WRITER_ERROR "\nRefusing to write to this drive\n1\n", LONG_TIMEOUT);
 222                         return true;
 223                 }
 224 #endif
 225
 226                 bool on_drive_list = false;
 227                 bool mounted = false;
 228                 for (auto const& i: Drive::get()) {
 229                         if (i.device() == device) {
 230                                 on_drive_list = true;
 231                                 mounted = i.mounted();
 232                         }
 233                 }
 234
 235                 if (!on_drive_list) {
 236                         LOG_DISK ("Will not write to %1 as it's not recognised as a drive", device);
 237                         nanomsg->send(DISK_WRITER_ERROR "\nRefusing to write to this drive\n1\n", LONG_TIMEOUT);
 238                         return true;
 239                 }
 240                 if (mounted) {
 241                         LOG_DISK ("Will not write to %1 as it's mounted", device);
 242                         nanomsg->send(DISK_WRITER_ERROR "\nRefusing to write to this drive\n1\n", LONG_TIMEOUT);
 243                         return true;
 244                 }
 245
 246                 LOG_DISK ("Here we go writing %1 to %2", dcp_path, device);
 247
 248                 request_privileges (
 249                         "com.dcpomatic.write-drive",
 250                         [dcp_path, device]() {
 251 #if defined(DCPOMATIC_LINUX)
 252                                 auto posix_partition = device;
 253                                 /* XXX: don't know if this logic is sensible */
 254                                 if (posix_partition.size() > 0 && isdigit(posix_partition[posix_partition.length() - 1])) {
 255                                         posix_partition += "p1";
 256                                 } else {
 257                                         posix_partition += "1";
 258                                 }
 259                                 dcpomatic::write (dcp_path, device, posix_partition, nanomsg);
 260 #elif defined(DCPOMATIC_OSX)
 261                                 auto fast_device = boost::algorithm::replace_first_copy (device, "/dev/disk", "/dev/rdisk");
 262                                 dcpomatic::write (dcp_path, fast_device, fast_device + "s1", nanomsg);
 263 #elif defined(DCPOMATIC_WINDOWS)
 264                                 dcpomatic::write (dcp_path, device, "", nanomsg);
 265 #endif
 266                         },
 267                         []() {
 268                                 if (nanomsg) {
 269                                         nanomsg->send(DISK_WRITER_ERROR "\nCould not obtain authorization to write to the drive\n", LONG_TIMEOUT);
 270                                 }
 271                         });
 272         }
 273
 274         return true;
 275 } catch (exception& e) {
 276         LOG_DISK("Exception (from idle): %1", e.what());
 277         return true;
 278 }
 279
 280 int
 281 main ()
 282 {
 283 #ifdef DCPOMATIC_OSX
 284         /* On macOS this is running as root, so config_path() will be somewhere in root's
 285          * home.  Instead, just write to stdout as the macOS process control stuff will
 286          * redirect this to a file in /var/log
 287          */
 288         dcpomatic_log.reset(new StdoutLog(LogEntry::TYPE_DISK));
 289         LOG_DISK("dcpomatic_disk_writer %1 started uid=%2 euid=%3", dcpomatic_git_commit, getuid(), geteuid());
 290 #else
 291         /* XXX: this is a hack, but I expect we'll need logs and I'm not sure if there's
 292          * a better place to put them.
 293          */
 294         dcpomatic_log.reset(new FileLog(State::write_path("disk_writer.log"), LogEntry::TYPE_DISK));
 295         LOG_DISK_NC("dcpomatic_disk_writer started");
 296 #endif
 297
 298 #ifdef DCPOMATIC_OSX
 299         /* I *think* this consumes the notifyd event that we used to start the process, so we only
 300          * get started once per notification.
 301          */
 302         xpc_set_event_stream_handler("com.apple.notifyd.matching", DISPATCH_TARGET_QUEUE_DEFAULT, ^(xpc_object_t) {});
 303 #endif
 304
 305         try {
 306                 nanomsg = new Nanomsg (false);
 307         } catch (runtime_error& e) {
 308                 LOG_DISK_NC("Could not set up nanomsg socket");
 309                 exit (EXIT_FAILURE);
 310         }
 311
 312         LOG_DISK_NC("Entering main loop");
 313         auto ml = Glib::MainLoop::create ();
 314         Glib::signal_timeout().connect(sigc::ptr_fun(&idle), 500);
 315         ml->run ();
 316 }