src/PVE/LXC.pm

   1 package PVE::LXC;
   2
   3 use strict;
   4 use warnings;
   5
   6 use POSIX qw(EINTR);
   7
   8 use Socket;
   9
  10 use File::Path;
  11 use File::Spec;
  12 use Cwd qw();
  13 use Fcntl qw(O_RDONLY O_NOFOLLOW O_DIRECTORY);
  14 use Errno qw(ELOOP ENOTDIR EROFS);
  15
  16 use PVE::Exception qw(raise_perm_exc);
  17 use PVE::Storage;
  18 use PVE::SafeSyslog;
  19 use PVE::INotify;
  20 use PVE::Tools qw($IPV6RE $IPV4RE dir_glob_foreach lock_file lock_file_full O_PATH);
  21 use PVE::CpuSet;
  22 use PVE::Network;
  23 use PVE::AccessControl;
  24 use PVE::ProcFSTools;
  25 use PVE::Syscall;
  26 use PVE::LXC::Config;
  27 use Time::HiRes qw (gettimeofday);
  28
  29 my $nodename = PVE::INotify::nodename();
  30
  31 my $cpuinfo= PVE::ProcFSTools::read_cpuinfo();
  32
  33 sub config_list {
  34     my $vmlist = PVE::Cluster::get_vmlist();
  35     my $res = {};
  36     return $res if !$vmlist || !$vmlist->{ids};
  37     my $ids = $vmlist->{ids};
  38
  39     foreach my $vmid (keys %$ids) {
  40         next if !$vmid; # skip CT0
  41         my $d = $ids->{$vmid};
  42         next if !$d->{node} || $d->{node} ne $nodename;
  43         next if !$d->{type} || $d->{type} ne 'lxc';
  44         $res->{$vmid}->{type} = 'lxc';
  45     }
  46     return $res;
  47 }
  48
  49 sub destroy_config {
  50     my ($vmid) = @_;
  51
  52     unlink PVE::LXC::Config->config_file($vmid, $nodename);
  53 }
  54
  55 # container status helpers
  56
  57 sub list_active_containers {
  58
  59     my $filename = "/proc/net/unix";
  60
  61     # similar test is used by lcxcontainers.c: list_active_containers
  62     my $res = {};
  63
  64     my $fh = IO::File->new ($filename, "r");
  65     return $res if !$fh;
  66
  67     while (defined(my $line = <$fh>)) {
  68         if ($line =~ m/^[a-f0-9]+:\s+\S+\s+\S+\s+\S+\s+\S+\s+\S+\s+\d+\s+(\S+)$/) {
  69             my $path = $1;
  70             if ($path =~ m!^@/var/lib/lxc/(\d+)/command$!) {
  71                 $res->{$1} = 1;
  72             }
  73         }
  74     }
  75
  76     close($fh);
  77
  78     return $res;
  79 }
  80
  81 # warning: this is slow
  82 sub check_running {
  83     my ($vmid) = @_;
  84
  85     my $active_hash = list_active_containers();
  86
  87     return 1 if defined($active_hash->{$vmid});
  88
  89     return undef;
  90 }
  91
  92 sub get_container_disk_usage {
  93     my ($vmid, $pid) = @_;
  94
  95     return PVE::Tools::df("/proc/$pid/root/", 1);
  96 }
  97
  98 my $last_proc_vmid_stat;
  99
 100 my $parse_cpuacct_stat = sub {
 101     my ($vmid) = @_;
 102
 103     my $raw = read_cgroup_value('cpuacct', $vmid, 'cpuacct.stat', 1);
 104
 105     my $stat = {};
 106
 107     if ($raw =~ m/^user (\d+)\nsystem (\d+)\n/) {
 108
 109         $stat->{utime} = $1;
 110         $stat->{stime} = $2;
 111
 112     }
 113
 114     return $stat;
 115 };
 116
 117 sub vmstatus {
 118     my ($opt_vmid) = @_;
 119
 120     my $list = $opt_vmid ? { $opt_vmid => { type => 'lxc' }} : config_list();
 121
 122     my $active_hash = list_active_containers();
 123
 124     my $cpucount = $cpuinfo->{cpus} || 1;
 125
 126     my $cdtime = gettimeofday;
 127
 128     my $uptime = (PVE::ProcFSTools::read_proc_uptime(1))[0];
 129
 130     foreach my $vmid (keys %$list) {
 131         my $d = $list->{$vmid};
 132
 133         eval { $d->{pid} = find_lxc_pid($vmid) if defined($active_hash->{$vmid}); };
 134         warn $@ if $@; # ignore errors (consider them stopped)
 135
 136         $d->{status} = $d->{pid} ? 'running' : 'stopped';
 137
 138         my $cfspath = PVE::LXC::Config->cfs_config_path($vmid);
 139         my $conf = PVE::Cluster::cfs_read_file($cfspath) || {};
 140
 141         $d->{name} = $conf->{'hostname'} || "CT$vmid";
 142         $d->{name} =~ s/[\s]//g;
 143
 144         $d->{cpus} = $conf->{cores} || $conf->{cpulimit};
 145         $d->{cpus} = $cpucount if !$d->{cpus};
 146
 147         $d->{lock} = $conf->{lock} || '';
 148
 149         if ($d->{pid}) {
 150             my $res = get_container_disk_usage($vmid, $d->{pid});
 151             $d->{disk} = $res->{used};
 152             $d->{maxdisk} = $res->{total};
 153         } else {
 154             $d->{disk} = 0;
 155             # use 4GB by default ??
 156             if (my $rootfs = $conf->{rootfs}) {
 157                 my $rootinfo = PVE::LXC::Config->parse_ct_rootfs($rootfs);
 158                 $d->{maxdisk} = $rootinfo->{size} || (4*1024*1024*1024);
 159             } else {
 160                 $d->{maxdisk} = 4*1024*1024*1024;
 161             }
 162         }
 163
 164         $d->{mem} = 0;
 165         $d->{swap} = 0;
 166         $d->{maxmem} = ($conf->{memory}||512)*1024*1024;
 167         $d->{maxswap} = ($conf->{swap}//0)*1024*1024;
 168
 169         $d->{uptime} = 0;
 170         $d->{cpu} = 0;
 171
 172         $d->{netout} = 0;
 173         $d->{netin} = 0;
 174
 175         $d->{diskread} = 0;
 176         $d->{diskwrite} = 0;
 177
 178         $d->{template} = PVE::LXC::Config->is_template($conf);
 179     }
 180
 181     foreach my $vmid (keys %$list) {
 182         my $d = $list->{$vmid};
 183         my $pid = $d->{pid};
 184
 185         next if !$pid; # skip stopped CTs
 186
 187         my $ctime = (stat("/proc/$pid"))[10]; # 10 = ctime
 188         $d->{uptime} = time - $ctime; # the method lxcfs uses
 189
 190         my $memory_stat = read_cgroup_list('memory', $vmid, 'memory.stat');
 191         my $mem_usage_in_bytes = read_cgroup_value('memory', $vmid, 'memory.usage_in_bytes');
 192
 193         $d->{mem} = $mem_usage_in_bytes - $memory_stat->{total_cache};
 194         $d->{swap} = read_cgroup_value('memory', $vmid, 'memory.memsw.usage_in_bytes') - $mem_usage_in_bytes;
 195
 196         my $blkio_bytes = read_cgroup_value('blkio', $vmid, 'blkio.throttle.io_service_bytes', 1);
 197         my @bytes = split(/\n/, $blkio_bytes);
 198         foreach my $byte (@bytes) {
 199             if (my ($key, $value) = $byte =~ /(Read|Write)\s+(\d+)/) {
 200                 $d->{diskread} = $2 if $key eq 'Read';
 201                 $d->{diskwrite} = $2 if $key eq 'Write';
 202             }
 203         }
 204
 205         my $pstat = &$parse_cpuacct_stat($vmid);
 206
 207         my $used = $pstat->{utime} + $pstat->{stime};
 208
 209         my $old = $last_proc_vmid_stat->{$vmid};
 210         if (!$old) {
 211             $last_proc_vmid_stat->{$vmid} = {
 212                 time => $cdtime,
 213                 used => $used,
 214                 cpu => 0,
 215             };
 216             next;
 217         }
 218
 219         my $dtime = ($cdtime -  $old->{time}) * $cpucount * $cpuinfo->{user_hz};
 220
 221         if ($dtime > 1000) {
 222             my $dutime = $used -  $old->{used};
 223
 224             $d->{cpu} = (($dutime/$dtime)* $cpucount) / $d->{cpus};
 225             $last_proc_vmid_stat->{$vmid} = {
 226                 time => $cdtime,
 227                 used => $used,
 228                 cpu => $d->{cpu},
 229             };
 230         } else {
 231             $d->{cpu} = $old->{cpu};
 232         }
 233     }
 234
 235     my $netdev = PVE::ProcFSTools::read_proc_net_dev();
 236
 237     foreach my $dev (keys %$netdev) {
 238         next if $dev !~ m/^veth([1-9]\d*)i/;
 239         my $vmid = $1;
 240         my $d = $list->{$vmid};
 241
 242         next if !$d;
 243
 244         $d->{netout} += $netdev->{$dev}->{receive};
 245         $d->{netin} += $netdev->{$dev}->{transmit};
 246
 247     }
 248
 249     return $list;
 250 }
 251
 252 sub read_cgroup_list {
 253     my ($group, $vmid, $name) = @_;
 254
 255     my $content = read_cgroup_value($group, $vmid, $name, 1);
 256
 257     return { split(/\s+/, $content) };
 258 }
 259
 260 sub read_cgroup_value {
 261     my ($group, $vmid, $name, $full) = @_;
 262
 263     my $path = "/sys/fs/cgroup/$group/lxc/$vmid/$name";
 264
 265     return PVE::Tools::file_get_contents($path) if $full;
 266
 267     return PVE::Tools::file_read_firstline($path);
 268 }
 269
 270 sub write_cgroup_value {
 271    my ($group, $vmid, $name, $value) = @_;
 272
 273    my $path = "/sys/fs/cgroup/$group/lxc/$vmid/$name";
 274    PVE::ProcFSTools::write_proc_entry($path, $value) if -e $path;
 275
 276 }
 277
 278 sub find_lxc_console_pids {
 279
 280     my $res = {};
 281
 282     PVE::Tools::dir_glob_foreach('/proc', '\d+', sub {
 283         my ($pid) = @_;
 284
 285         my $cmdline = PVE::Tools::file_read_firstline("/proc/$pid/cmdline");
 286         return if !$cmdline;
 287
 288         my @args = split(/\0/, $cmdline);
 289
 290         # search for lxc-console -n <vmid>
 291         return if scalar(@args) != 3;
 292         return if $args[1] ne '-n';
 293         return if $args[2] !~ m/^\d+$/;
 294         return if $args[0] !~ m|^(/usr/bin/)?lxc-console$|;
 295
 296         my $vmid = $args[2];
 297
 298         push @{$res->{$vmid}}, $pid;
 299     });
 300
 301     return $res;
 302 }
 303
 304 sub find_lxc_pid {
 305     my ($vmid) = @_;
 306
 307     my $pid = undef;
 308     my $parser = sub {
 309         my $line = shift;
 310         $pid = $1 if $line =~ m/^PID:\s+(\d+)$/;
 311     };
 312     PVE::Tools::run_command(['lxc-info', '-n', $vmid, '-p'], outfunc => $parser);
 313
 314     die "unable to get PID for CT $vmid (not running?)\n" if !$pid;
 315
 316     return $pid;
 317 }
 318
 319 # Note: we cannot use Net:IP, because that only allows strict
 320 # CIDR networks
 321 sub parse_ipv4_cidr {
 322     my ($cidr, $noerr) = @_;
 323
 324     if ($cidr =~ m!^($IPV4RE)(?:/(\d+))$! && ($2 > 7) &&  ($2 <= 32)) {
 325         return { address => $1, netmask => $PVE::Network::ipv4_reverse_mask->[$2] };
 326     }
 327
 328     return undef if $noerr;
 329
 330     die "unable to parse ipv4 address/mask\n";
 331 }
 332
 333
 334 sub update_lxc_config {
 335     my ($vmid, $conf) = @_;
 336
 337     my $dir = "/var/lib/lxc/$vmid";
 338
 339     if ($conf->{template}) {
 340
 341         unlink "$dir/config";
 342
 343         return;
 344     }
 345
 346     my $raw = '';
 347
 348     die "missing 'arch' - internal error" if !$conf->{arch};
 349     $raw .= "lxc.arch = $conf->{arch}\n";
 350
 351     my $unprivileged = $conf->{unprivileged};
 352     my $custom_idmap = grep { $_->[0] eq 'lxc.idmap' } @{$conf->{lxc}};
 353
 354     my $ostype = $conf->{ostype} || die "missing 'ostype' - internal error";
 355
 356     my $inc ="/usr/share/lxc/config/$ostype.common.conf";
 357     $inc ="/usr/share/lxc/config/common.conf" if !-f $inc;
 358     $raw .= "lxc.include = $inc\n";
 359     if ($unprivileged || $custom_idmap) {
 360         $inc = "/usr/share/lxc/config/$ostype.userns.conf";
 361         $inc = "/usr/share/lxc/config/userns.conf" if !-f $inc;
 362         $raw .= "lxc.include = $inc\n"
 363     }
 364
 365     # WARNING: DO NOT REMOVE this without making sure that loop device nodes
 366     # cannot be exposed to the container with r/w access (cgroup perms).
 367     # When this is enabled mounts will still remain in the monitor's namespace
 368     # after the container unmounted them and thus will not detach from their
 369     # files while the container is running!
 370     $raw .= "lxc.monitor.unshare = 1\n";
 371
 372     # Should we read them from /etc/subuid?
 373     if ($unprivileged && !$custom_idmap) {
 374         $raw .= "lxc.idmap = u 0 100000 65536\n";
 375         $raw .= "lxc.idmap = g 0 100000 65536\n";
 376     }
 377
 378     if (!PVE::LXC::Config->has_dev_console($conf)) {
 379         $raw .= "lxc.console.path = none\n";
 380         $raw .= "lxc.cgroup.devices.deny = c 5:1 rwm\n";
 381     }
 382
 383     my $ttycount = PVE::LXC::Config->get_tty_count($conf);
 384     $raw .= "lxc.tty.max = $ttycount\n";
 385
 386     # some init scripts expect a linux terminal (turnkey).
 387     $raw .= "lxc.environment = TERM=linux\n";
 388
 389     my $utsname = $conf->{hostname} || "CT$vmid";
 390     $raw .= "lxc.uts.name = $utsname\n";
 391
 392     my $memory = $conf->{memory} || 512;
 393     my $swap = $conf->{swap} // 0;
 394
 395     my $lxcmem = int($memory*1024*1024);
 396     $raw .= "lxc.cgroup.memory.limit_in_bytes = $lxcmem\n";
 397
 398     my $lxcswap = int(($memory + $swap)*1024*1024);
 399     $raw .= "lxc.cgroup.memory.memsw.limit_in_bytes = $lxcswap\n";
 400
 401     if (my $cpulimit = $conf->{cpulimit}) {
 402         $raw .= "lxc.cgroup.cpu.cfs_period_us = 100000\n";
 403         my $value = int(100000*$cpulimit);
 404         $raw .= "lxc.cgroup.cpu.cfs_quota_us = $value\n";
 405     }
 406
 407     my $shares = $conf->{cpuunits} || 1024;
 408     $raw .= "lxc.cgroup.cpu.shares = $shares\n";
 409
 410     die "missing 'rootfs' configuration\n"
 411         if !defined($conf->{rootfs});
 412
 413     my $mountpoint = PVE::LXC::Config->parse_ct_rootfs($conf->{rootfs});
 414
 415     $raw .= "lxc.rootfs.path = $dir/rootfs\n";
 416
 417     foreach my $k (sort keys %$conf) {
 418         next if $k !~ m/^net(\d+)$/;
 419         my $ind = $1;
 420         my $d = PVE::LXC::Config->parse_lxc_network($conf->{$k});
 421         $raw .= "lxc.net.$ind.type = veth\n";
 422         $raw .= "lxc.net.$ind.veth.pair = veth${vmid}i${ind}\n";
 423         $raw .= "lxc.net.$ind.hwaddr = $d->{hwaddr}\n" if defined($d->{hwaddr});
 424         $raw .= "lxc.net.$ind.name = $d->{name}\n" if defined($d->{name});
 425         $raw .= "lxc.net.$ind.mtu = $d->{mtu}\n" if defined($d->{mtu});
 426     }
 427
 428     my $had_cpuset = 0;
 429     if (my $lxcconf = $conf->{lxc}) {
 430         foreach my $entry (@$lxcconf) {
 431             my ($k, $v) = @$entry;
 432             $had_cpuset = 1 if $k eq 'lxc.cgroup.cpuset.cpus';
 433             $raw .= "$k = $v\n";
 434         }
 435     }
 436
 437     my $cores = $conf->{cores};
 438     if (!$had_cpuset && $cores) {
 439         my $cpuset = eval { PVE::CpuSet->new_from_cgroup('lxc', 'effective_cpus') };
 440         $cpuset = PVE::CpuSet->new_from_cgroup('', 'effective_cpus') if !$cpuset;
 441         my @members = $cpuset->members();
 442         while (scalar(@members) > $cores) {
 443             my $randidx = int(rand(scalar(@members)));
 444             $cpuset->delete($members[$randidx]);
 445             splice(@members, $randidx, 1); # keep track of the changes
 446         }
 447         $raw .= "lxc.cgroup.cpuset.cpus = ".$cpuset->short_string()."\n";
 448     }
 449
 450     File::Path::mkpath("$dir/rootfs");
 451
 452     PVE::Tools::file_set_contents("$dir/config", $raw);
 453 }
 454
 455 # verify and cleanup nameserver list (replace \0 with ' ')
 456 sub verify_nameserver_list {
 457     my ($nameserver_list) = @_;
 458
 459     my @list = ();
 460     foreach my $server (PVE::Tools::split_list($nameserver_list)) {
 461         PVE::JSONSchema::pve_verify_ip($server);
 462         push @list, $server;
 463     }
 464
 465     return join(' ', @list);
 466 }
 467
 468 sub verify_searchdomain_list {
 469     my ($searchdomain_list) = @_;
 470
 471     my @list = ();
 472     foreach my $server (PVE::Tools::split_list($searchdomain_list)) {
 473         # todo: should we add checks for valid dns domains?
 474         push @list, $server;
 475     }
 476
 477     return join(' ', @list);
 478 }
 479
 480 sub get_console_command {
 481     my ($vmid, $conf) = @_;
 482
 483     my $cmode = PVE::LXC::Config->get_cmode($conf);
 484
 485     if ($cmode eq 'console') {
 486         return ['lxc-console', '-n',  $vmid, '-t', 0];
 487     } elsif ($cmode eq 'tty') {
 488         return ['lxc-console', '-n',  $vmid];
 489     } elsif ($cmode eq 'shell') {
 490         return ['lxc-attach', '--clear-env', '-n', $vmid];
 491     } else {
 492         die "internal error";
 493     }
 494 }
 495
 496 sub get_primary_ips {
 497     my ($conf) = @_;
 498
 499     # return data from net0
 500
 501     return undef if !defined($conf->{net0});
 502     my $net = PVE::LXC::Config->parse_lxc_network($conf->{net0});
 503
 504     my $ipv4 = $net->{ip};
 505     if ($ipv4) {
 506         if ($ipv4 =~ /^(dhcp|manual)$/) {
 507             $ipv4 = undef
 508         } else {
 509             $ipv4 =~ s!/\d+$!!;
 510         }
 511     }
 512     my $ipv6 = $net->{ip6};
 513     if ($ipv6) {
 514         if ($ipv6 =~ /^(auto|dhcp|manual)$/) {
 515             $ipv6 = undef;
 516         } else {
 517             $ipv6 =~ s!/\d+$!!;
 518         }
 519     }
 520
 521     return ($ipv4, $ipv6);
 522 }
 523
 524 sub delete_mountpoint_volume {
 525     my ($storage_cfg, $vmid, $volume) = @_;
 526
 527     return if PVE::LXC::Config->classify_mountpoint($volume) ne 'volume';
 528
 529     my ($vtype, $name, $owner) = PVE::Storage::parse_volname($storage_cfg, $volume);
 530     PVE::Storage::vdisk_free($storage_cfg, $volume) if $vmid == $owner;
 531 }
 532
 533 sub destroy_lxc_container {
 534     my ($storage_cfg, $vmid, $conf, $replacement_conf) = @_;
 535
 536     PVE::LXC::Config->foreach_mountpoint($conf, sub {
 537         my ($ms, $mountpoint) = @_;
 538         delete_mountpoint_volume($storage_cfg, $vmid, $mountpoint->{volume});
 539     });
 540
 541     rmdir "/var/lib/lxc/$vmid/rootfs";
 542     unlink "/var/lib/lxc/$vmid/config";
 543     rmdir "/var/lib/lxc/$vmid";
 544     if (defined $replacement_conf) {
 545         PVE::LXC::Config->write_config($vmid, $replacement_conf);
 546     } else {
 547         destroy_config($vmid);
 548     }
 549
 550     #my $cmd = ['lxc-destroy', '-n', $vmid ];
 551     #PVE::Tools::run_command($cmd);
 552 }
 553
 554 sub vm_stop_cleanup {
 555     my ($storage_cfg, $vmid, $conf, $keepActive) = @_;
 556
 557     eval {
 558         if (!$keepActive) {
 559
 560             my $vollist = PVE::LXC::Config->get_vm_volumes($conf);
 561             PVE::Storage::deactivate_volumes($storage_cfg, $vollist);
 562         }
 563     };
 564     warn $@ if $@; # avoid errors - just warn
 565 }
 566
 567 my $safe_num_ne = sub {
 568     my ($a, $b) = @_;
 569
 570     return 0 if !defined($a) && !defined($b);
 571     return 1 if !defined($a);
 572     return 1 if !defined($b);
 573
 574     return $a != $b;
 575 };
 576
 577 my $safe_string_ne = sub {
 578     my ($a, $b) = @_;
 579
 580     return 0 if !defined($a) && !defined($b);
 581     return 1 if !defined($a);
 582     return 1 if !defined($b);
 583
 584     return $a ne $b;
 585 };
 586
 587 sub update_net {
 588     my ($vmid, $conf, $opt, $newnet, $netid, $rootdir) = @_;
 589
 590     if ($newnet->{type} ne 'veth') {
 591         # for when there are physical interfaces
 592         die "cannot update interface of type $newnet->{type}";
 593     }
 594
 595     my $veth = "veth${vmid}i${netid}";
 596     my $eth = $newnet->{name};
 597
 598     if (my $oldnetcfg = $conf->{$opt}) {
 599         my $oldnet = PVE::LXC::Config->parse_lxc_network($oldnetcfg);
 600
 601         if (&$safe_string_ne($oldnet->{hwaddr}, $newnet->{hwaddr}) ||
 602             &$safe_string_ne($oldnet->{name}, $newnet->{name})) {
 603
 604             PVE::Network::veth_delete($veth);
 605             delete $conf->{$opt};
 606             PVE::LXC::Config->write_config($vmid, $conf);
 607
 608             hotplug_net($vmid, $conf, $opt, $newnet, $netid);
 609
 610         } else {
 611             if (&$safe_string_ne($oldnet->{bridge}, $newnet->{bridge}) ||
 612                 &$safe_num_ne($oldnet->{tag}, $newnet->{tag}) ||
 613                 &$safe_num_ne($oldnet->{firewall}, $newnet->{firewall})) {
 614
 615                 if ($oldnet->{bridge}) {
 616                     PVE::Network::tap_unplug($veth);
 617                     foreach (qw(bridge tag firewall)) {
 618                         delete $oldnet->{$_};
 619                     }
 620                     $conf->{$opt} = PVE::LXC::Config->print_lxc_network($oldnet);
 621                     PVE::LXC::Config->write_config($vmid, $conf);
 622                 }
 623
 624                 PVE::Network::tap_plug($veth, $newnet->{bridge}, $newnet->{tag}, $newnet->{firewall}, $newnet->{trunks}, $newnet->{rate});
 625                 # This includes the rate:
 626                 foreach (qw(bridge tag firewall rate)) {
 627                     $oldnet->{$_} = $newnet->{$_} if $newnet->{$_};
 628                 }
 629             } elsif (&$safe_string_ne($oldnet->{rate}, $newnet->{rate})) {
 630                 # Rate can be applied on its own but any change above needs to
 631                 # include the rate in tap_plug since OVS resets everything.
 632                 PVE::Network::tap_rate_limit($veth, $newnet->{rate});
 633                 $oldnet->{rate} = $newnet->{rate}
 634             }
 635             $conf->{$opt} = PVE::LXC::Config->print_lxc_network($oldnet);
 636             PVE::LXC::Config->write_config($vmid, $conf);
 637         }
 638     } else {
 639         hotplug_net($vmid, $conf, $opt, $newnet, $netid);
 640     }
 641
 642     update_ipconfig($vmid, $conf, $opt, $eth, $newnet, $rootdir);
 643 }
 644
 645 sub hotplug_net {
 646     my ($vmid, $conf, $opt, $newnet, $netid) = @_;
 647
 648     my $veth = "veth${vmid}i${netid}";
 649     my $vethpeer = $veth . "p";
 650     my $eth = $newnet->{name};
 651
 652     PVE::Network::veth_create($veth, $vethpeer, $newnet->{bridge}, $newnet->{hwaddr});
 653     PVE::Network::tap_plug($veth, $newnet->{bridge}, $newnet->{tag}, $newnet->{firewall}, $newnet->{trunks}, $newnet->{rate});
 654
 655     # attach peer in container
 656     my $cmd = ['lxc-device', '-n', $vmid, 'add', $vethpeer, "$eth" ];
 657     PVE::Tools::run_command($cmd);
 658
 659     # link up peer in container
 660     $cmd = ['lxc-attach', '-n', $vmid, '-s', 'NETWORK', '--', '/sbin/ip', 'link', 'set', $eth ,'up'  ];
 661     PVE::Tools::run_command($cmd);
 662
 663     my $done = { type => 'veth' };
 664     foreach (qw(bridge tag firewall hwaddr name)) {
 665         $done->{$_} = $newnet->{$_} if $newnet->{$_};
 666     }
 667     $conf->{$opt} = PVE::LXC::Config->print_lxc_network($done);
 668
 669     PVE::LXC::Config->write_config($vmid, $conf);
 670 }
 671
 672 sub update_ipconfig {
 673     my ($vmid, $conf, $opt, $eth, $newnet, $rootdir) = @_;
 674
 675     my $lxc_setup = PVE::LXC::Setup->new($conf, $rootdir);
 676
 677     my $optdata = PVE::LXC::Config->parse_lxc_network($conf->{$opt});
 678     my $deleted = [];
 679     my $added = [];
 680     my $nscmd = sub {
 681         my $cmdargs = shift;
 682         PVE::Tools::run_command(['lxc-attach', '-n', $vmid, '-s', 'NETWORK', '--', @_], %$cmdargs);
 683     };
 684     my $ipcmd = sub { &$nscmd({}, '/sbin/ip', @_) };
 685
 686     my $change_ip_config = sub {
 687         my ($ipversion) = @_;
 688
 689         my $family_opt = "-$ipversion";
 690         my $suffix = $ipversion == 4 ? '' : $ipversion;
 691         my $gw= "gw$suffix";
 692         my $ip= "ip$suffix";
 693
 694         my $newip = $newnet->{$ip};
 695         my $newgw = $newnet->{$gw};
 696         my $oldip = $optdata->{$ip};
 697
 698         my $change_ip = &$safe_string_ne($oldip, $newip);
 699         my $change_gw = &$safe_string_ne($optdata->{$gw}, $newgw);
 700
 701         return if !$change_ip && !$change_gw;
 702
 703         # step 1: add new IP, if this fails we cancel
 704         my $is_real_ip = ($newip && $newip !~ /^(?:auto|dhcp|manual)$/);
 705         if ($change_ip && $is_real_ip) {
 706             eval { &$ipcmd($family_opt, 'addr', 'add', $newip, 'dev', $eth); };
 707             if (my $err = $@) {
 708                 warn $err;
 709                 return;
 710             }
 711         }
 712
 713         # step 2: replace gateway
 714         #   If this fails we delete the added IP and cancel.
 715         #   If it succeeds we save the config and delete the old IP, ignoring
 716         #   errors. The config is then saved.
 717         # Note: 'ip route replace' can add
 718         if ($change_gw) {
 719             if ($newgw) {
 720                 eval {
 721                     if ($is_real_ip && !PVE::Network::is_ip_in_cidr($newgw, $newip, $ipversion)) {
 722                         &$ipcmd($family_opt, 'route', 'add', $newgw, 'dev', $eth);
 723                     }
 724                     &$ipcmd($family_opt, 'route', 'replace', 'default', 'via', $newgw);
 725                 };
 726                 if (my $err = $@) {
 727                     warn $err;
 728                     # the route was not replaced, the old IP is still available
 729                     # rollback (delete new IP) and cancel
 730                     if ($change_ip) {
 731                         eval { &$ipcmd($family_opt, 'addr', 'del', $newip, 'dev', $eth); };
 732                         warn $@ if $@; # no need to die here
 733                     }
 734                     return;
 735                 }
 736             } else {
 737                 eval { &$ipcmd($family_opt, 'route', 'del', 'default'); };
 738                 # if the route was not deleted, the guest might have deleted it manually
 739                 # warn and continue
 740                 warn $@ if $@;
 741             }
 742         }
 743
 744         # from this point on we save the configuration
 745         # step 3: delete old IP ignoring errors
 746         if ($change_ip && $oldip && $oldip !~ /^(?:auto|dhcp)$/) {
 747             # We need to enable promote_secondaries, otherwise our newly added
 748             # address will be removed along with the old one.
 749             my $promote = 0;
 750             eval {
 751                 if ($ipversion == 4) {
 752                     &$nscmd({ outfunc => sub { $promote = int(shift) } },
 753                             'cat', "/proc/sys/net/ipv4/conf/$eth/promote_secondaries");
 754                     &$nscmd({}, 'sysctl', "net.ipv4.conf.$eth.promote_secondaries=1");
 755                 }
 756                 &$ipcmd($family_opt, 'addr', 'del', $oldip, 'dev', $eth);
 757             };
 758             warn $@ if $@; # no need to die here
 759
 760             if ($ipversion == 4) {
 761                 &$nscmd({}, 'sysctl', "net.ipv4.conf.$eth.promote_secondaries=$promote");
 762             }
 763         }
 764
 765         foreach my $property ($ip, $gw) {
 766             if ($newnet->{$property}) {
 767                 $optdata->{$property} = $newnet->{$property};
 768             } else {
 769                 delete $optdata->{$property};
 770             }
 771         }
 772         $conf->{$opt} = PVE::LXC::Config->print_lxc_network($optdata);
 773         PVE::LXC::Config->write_config($vmid, $conf);
 774         $lxc_setup->setup_network($conf);
 775     };
 776
 777     &$change_ip_config(4);
 778     &$change_ip_config(6);
 779
 780 }
 781
 782 my $enter_namespace = sub {
 783     my ($vmid, $pid, $which, $type) = @_;
 784     sysopen my $fd, "/proc/$pid/ns/$which", O_RDONLY
 785         or die "failed to open $which namespace of container $vmid: $!\n";
 786     PVE::Tools::setns(fileno($fd), $type)
 787         or die "failed to enter $which namespace of container $vmid: $!\n";
 788     close $fd;
 789 };
 790
 791 my $do_syncfs = sub {
 792     my ($vmid, $pid, $socket) = @_;
 793
 794     &$enter_namespace($vmid, $pid, 'mnt', PVE::Tools::CLONE_NEWNS);
 795
 796     # Tell the parent process to start reading our /proc/mounts
 797     print {$socket} "go\n";
 798     $socket->flush();
 799
 800     # Receive /proc/self/mounts
 801     my $mountdata = do { local $/ = undef; <$socket> };
 802     close $socket;
 803
 804     # Now sync all mountpoints...
 805     my $mounts = PVE::ProcFSTools::parse_mounts($mountdata);
 806     foreach my $mp (@$mounts) {
 807         my ($what, $dir, $fs) = @$mp;
 808         next if $fs eq 'fuse.lxcfs';
 809         eval { PVE::Tools::sync_mountpoint($dir); };
 810         warn $@ if $@;
 811     }
 812 };
 813
 814 sub sync_container_namespace {
 815     my ($vmid) = @_;
 816     my $pid = find_lxc_pid($vmid);
 817
 818     # SOCK_DGRAM is nicer for barriers but cannot be slurped
 819     socketpair my $pfd, my $cfd, AF_UNIX, SOCK_STREAM, PF_UNSPEC
 820         or die "failed to create socketpair: $!\n";
 821
 822     my $child = fork();
 823     die "fork failed: $!\n" if !defined($child);
 824
 825     if (!$child) {
 826         eval {
 827             close $pfd;
 828             &$do_syncfs($vmid, $pid, $cfd);
 829         };
 830         if (my $err = $@) {
 831             warn $err;
 832             POSIX::_exit(1);
 833         }
 834         POSIX::_exit(0);
 835     }
 836     close $cfd;
 837     my $go = <$pfd>;
 838     die "failed to enter container namespace\n" if $go ne "go\n";
 839
 840     open my $mounts, '<', "/proc/$child/mounts"
 841         or die "failed to open container's /proc/mounts: $!\n";
 842     my $mountdata = do { local $/ = undef; <$mounts> };
 843     close $mounts;
 844     print {$pfd} $mountdata;
 845     close $pfd;
 846
 847     while (waitpid($child, 0) != $child) {}
 848     die "failed to sync container namespace\n" if $? != 0;
 849 }
 850
 851 sub template_create {
 852     my ($vmid, $conf) = @_;
 853
 854     my $storecfg = PVE::Storage::config();
 855
 856     my $rootinfo = PVE::LXC::Config->parse_ct_rootfs($conf->{rootfs});
 857     my $volid = $rootinfo->{volume};
 858
 859     die "Template feature is not available for '$volid'\n"
 860         if !PVE::Storage::volume_has_feature($storecfg, 'template', $volid);
 861
 862     PVE::Storage::activate_volumes($storecfg, [$volid]);
 863
 864     my $template_volid = PVE::Storage::vdisk_create_base($storecfg, $volid);
 865     $rootinfo->{volume} = $template_volid;
 866     $conf->{rootfs} = PVE::LXC::Config->print_ct_mountpoint($rootinfo, 1);
 867
 868     PVE::LXC::Config->write_config($vmid, $conf);
 869 }
 870
 871 sub check_ct_modify_config_perm {
 872     my ($rpcenv, $authuser, $vmid, $pool, $newconf, $delete) = @_;
 873
 874     return 1 if $authuser eq 'root@pam';
 875
 876     my $check = sub {
 877         my ($opt, $delete) = @_;
 878         if ($opt eq 'cores' || $opt eq 'cpuunits' || $opt eq 'cpulimit') {
 879             $rpcenv->check_vm_perm($authuser, $vmid, $pool, ['VM.Config.CPU']);
 880         } elsif ($opt eq 'rootfs' || $opt =~ /^mp\d+$/) {
 881             $rpcenv->check_vm_perm($authuser, $vmid, $pool, ['VM.Config.Disk']);
 882             return if $delete;
 883             my $data = $opt eq 'rootfs' ? PVE::LXC::Config->parse_ct_rootfs($newconf->{$opt})
 884                                         : PVE::LXC::Config->parse_ct_mountpoint($newconf->{$opt});
 885             raise_perm_exc("mount point type $data->{type} is only allowed for root\@pam")
 886                 if $data->{type} ne 'volume';
 887         } elsif ($opt eq 'memory' || $opt eq 'swap') {
 888             $rpcenv->check_vm_perm($authuser, $vmid, $pool, ['VM.Config.Memory']);
 889         } elsif ($opt =~ m/^net\d+$/ || $opt eq 'nameserver' ||
 890                  $opt eq 'searchdomain' || $opt eq 'hostname') {
 891             $rpcenv->check_vm_perm($authuser, $vmid, $pool, ['VM.Config.Network']);
 892         } else {
 893             $rpcenv->check_vm_perm($authuser, $vmid, $pool, ['VM.Config.Options']);
 894         }
 895     };
 896
 897     foreach my $opt (keys %$newconf) {
 898         &$check($opt, 0);
 899     }
 900     foreach my $opt (@$delete) {
 901         &$check($opt, 1);
 902     }
 903
 904     return 1;
 905 }
 906
 907 sub umount_all {
 908     my ($vmid, $storage_cfg, $conf, $noerr) = @_;
 909
 910     my $rootdir = "/var/lib/lxc/$vmid/rootfs";
 911     my $volid_list = PVE::LXC::Config->get_vm_volumes($conf);
 912
 913     PVE::LXC::Config->foreach_mountpoint_reverse($conf, sub {
 914         my ($ms, $mountpoint) = @_;
 915
 916         my $volid = $mountpoint->{volume};
 917         my $mount = $mountpoint->{mp};
 918
 919         return if !$volid || !$mount;
 920
 921         my $mount_path = "$rootdir/$mount";
 922         $mount_path =~ s!/+!/!g;
 923
 924         return if !PVE::ProcFSTools::is_mounted($mount_path);
 925
 926         eval {
 927             PVE::Tools::run_command(['umount', '-d', $mount_path]);
 928         };
 929         if (my $err = $@) {
 930             if ($noerr) {
 931                 warn $err;
 932             } else {
 933                 die $err;
 934             }
 935         }
 936     });
 937 }
 938
 939 sub mount_all {
 940     my ($vmid, $storage_cfg, $conf, $ignore_ro) = @_;
 941
 942     my $rootdir = "/var/lib/lxc/$vmid/rootfs";
 943     File::Path::make_path($rootdir);
 944
 945     my $volid_list = PVE::LXC::Config->get_vm_volumes($conf);
 946     PVE::Storage::activate_volumes($storage_cfg, $volid_list);
 947
 948     eval {
 949         PVE::LXC::Config->foreach_mountpoint($conf, sub {
 950             my ($ms, $mountpoint) = @_;
 951
 952             $mountpoint->{ro} = 0 if $ignore_ro;
 953
 954             mountpoint_mount($mountpoint, $rootdir, $storage_cfg);
 955         });
 956     };
 957     if (my $err = $@) {
 958         warn "mounting container failed\n";
 959         umount_all($vmid, $storage_cfg, $conf, 1);
 960         die $err;
 961     }
 962
 963     return $rootdir;
 964 }
 965
 966
 967 sub mountpoint_mount_path {
 968     my ($mountpoint, $storage_cfg, $snapname) = @_;
 969
 970     return mountpoint_mount($mountpoint, undef, $storage_cfg, $snapname);
 971 }
 972
 973 sub query_loopdev {
 974     my ($path) = @_;
 975     my $found;
 976     my $parser = sub {
 977         my $line = shift;
 978         if ($line =~ m@^(/dev/loop\d+):@) {
 979             $found = $1;
 980         }
 981     };
 982     my $cmd = ['losetup', '--associated', $path];
 983     PVE::Tools::run_command($cmd, outfunc => $parser);
 984     return $found;
 985 }
 986
 987 # Run a function with a file attached to a loop device.
 988 # The loop device is always detached afterwards (or set to autoclear).
 989 # Returns the loop device.
 990 sub run_with_loopdev {
 991     my ($func, $file) = @_;
 992     my $device = query_loopdev($file);
 993     # Try to reuse an existing device
 994     if ($device) {
 995         # We assume that whoever setup the loop device is responsible for
 996         # detaching it.
 997         &$func($device);
 998         return $device;
 999     }
1000
1001     my $parser = sub {
1002         my $line = shift;
1003         if ($line =~ m@^(/dev/loop\d+)$@) {
1004             $device = $1;
1005         }
1006     };
1007     PVE::Tools::run_command(['losetup', '--show', '-f', $file], outfunc => $parser);
1008     die "failed to setup loop device for $file\n" if !$device;
1009     eval { &$func($device); };
1010     my $err = $@;
1011     PVE::Tools::run_command(['losetup', '-d', $device]);
1012     die $err if $err;
1013     return $device;
1014 }
1015
1016 # In scalar mode: returns a file handle to the deepest directory node.
1017 # In list context: returns a list of:
1018 #   * the deepest directory node
1019 #   * the 2nd deepest directory (parent of the above)
1020 #   * directory name of the last directory
1021 # So that the path $2/$3 should lead to $1 afterwards.
1022 sub walk_tree_nofollow($$$) {
1023     my ($start, $subdir, $mkdir) = @_;
1024
1025     # splitdir() returns '' for empty components including the leading /
1026     my @comps = grep { length($_)>0 } File::Spec->splitdir($subdir);
1027
1028     sysopen(my $fd, $start, O_PATH | O_DIRECTORY)
1029         or die "failed to open start directory $start: $!\n";
1030
1031     my $dir = $start;
1032     my $last_component = undef;
1033     my $second = $fd;
1034     foreach my $component (@comps) {
1035         $dir .= "/$component";
1036         my $next = PVE::Tools::openat(fileno($fd), $component, O_NOFOLLOW | O_DIRECTORY);
1037
1038         if (!$next) {
1039             # failed, check for symlinks and try to create the path
1040             die "symlink encountered at: $dir\n" if $! == ELOOP || $! == ENOTDIR;
1041             die "cannot open directory $dir: $!\n" if !$mkdir;
1042
1043             # We don't check for errors on mkdirat() here and just try to
1044             # openat() again, since at least one error (EEXIST) is an
1045             # expected possibility if multiple containers start
1046             # simultaneously. If someone else injects a symlink now then
1047             # the subsequent openat() will fail due to O_NOFOLLOW anyway.
1048             PVE::Tools::mkdirat(fileno($fd), $component, 0755);
1049
1050             $next = PVE::Tools::openat(fileno($fd), $component, O_NOFOLLOW | O_DIRECTORY);
1051             die "failed to create path: $dir: $!\n" if !$next;
1052         }
1053
1054         close $second if defined($last_component);
1055         $last_component = $component;
1056         $second = $fd;
1057         $fd = $next;
1058     }
1059
1060     return ($fd, defined($last_component) && $second, $last_component) if wantarray;
1061     close $second if defined($last_component);
1062     return $fd;
1063 }
1064
1065 # To guard against symlink attack races against other currently running
1066 # containers with shared recursive bind mount hierarchies we prepare a
1067 # directory handle for the directory we're mounting over to verify the
1068 # mountpoint afterwards.
1069 sub __bindmount_prepare {
1070     my ($hostroot, $dir) = @_;
1071     my $srcdh = walk_tree_nofollow($hostroot, $dir, 0);
1072     return $srcdh;
1073 }
1074
1075 # Assuming we mount to rootfs/a/b/c, verify with the directory handle to 'b'
1076 # ($parentfd) that 'b/c' (openat($parentfd, 'c')) really leads to the directory
1077 # we intended to bind mount.
1078 sub __bindmount_verify {
1079     my ($srcdh, $parentfd, $last_dir, $ro) = @_;
1080     my $destdh;
1081     if ($parentfd) {
1082         # Open the mount point path coming from the parent directory since the
1083         # filehandle we would have gotten as first result of walk_tree_nofollow
1084         # earlier is still a handle to the underlying directory instead of the
1085         # mounted path.
1086         $destdh = PVE::Tools::openat(fileno($parentfd), $last_dir, PVE::Tools::O_PATH | O_NOFOLLOW | O_DIRECTORY);
1087         die "failed to open mount point: $!\n" if !$destdh;
1088         if ($ro) {
1089             my $dot = '.';
1090             # no separate function because 99% of the time it's the wrong thing to use.
1091             if (syscall(PVE::Syscall::faccessat, fileno($destdh), $dot, &POSIX::W_OK, 0) != -1) {
1092                 die "failed to mark bind mount read only\n";
1093             }
1094             die "read-only check failed: $!\n" if $! != EROFS;
1095         }
1096     } else {
1097         # For the rootfs we don't have a parentfd so we open the path directly.
1098         # Note that this means bindmounting any prefix of the host's
1099         # /var/lib/lxc/$vmid path into another container is considered a grave
1100         # security error.
1101         sysopen $destdh, $last_dir, O_PATH | O_DIRECTORY;
1102         die "failed to open mount point: $!\n" if !$destdh;
1103     }
1104
1105     my ($srcdev, $srcinode) = stat($srcdh);
1106     my ($dstdev, $dstinode) = stat($destdh);
1107     close $srcdh;
1108     close $destdh;
1109
1110     return ($srcdev == $dstdev && $srcinode == $dstinode);
1111 }
1112
1113 # Perform the actual bind mounting:
1114 sub __bindmount_do {
1115     my ($dir, $dest, $ro, @extra_opts) = @_;
1116     PVE::Tools::run_command(['mount', '-o', 'bind', @extra_opts, $dir, $dest]);
1117     if ($ro) {
1118         eval { PVE::Tools::run_command(['mount', '-o', 'bind,remount,ro', $dest]); };
1119         if (my $err = $@) {
1120             warn "bindmount error\n";
1121             # don't leave writable bind-mounts behind...
1122             PVE::Tools::run_command(['umount', $dest]);
1123             die $err;
1124         }
1125     }
1126 }
1127
1128 sub bindmount {
1129     my ($dir, $parentfd, $last_dir, $dest, $ro, @extra_opts) = @_;
1130
1131     my $srcdh = __bindmount_prepare('/', $dir);
1132
1133     __bindmount_do($dir, $dest, $ro, @extra_opts);
1134
1135     if (!__bindmount_verify($srcdh, $parentfd, $last_dir, $ro)) {
1136         PVE::Tools::run_command(['umount', $dest]);
1137         die "detected mount path change at: $dir\n";
1138     }
1139 }
1140
1141 # Cleanup $rootdir a bit (double and trailing slashes), build the mount path
1142 # from $rootdir and $mount and walk the path from $rootdir to the final
1143 # directory to check for symlinks.
1144 sub __mount_prepare_rootdir {
1145     my ($rootdir, $mount) = @_;
1146     $rootdir =~ s!/+!/!g;
1147     $rootdir =~ s!/+$!!;
1148     my $mount_path = "$rootdir/$mount";
1149     my ($mpfd, $parentfd, $last_dir) = walk_tree_nofollow($rootdir, $mount, 1);
1150     return ($rootdir, $mount_path, $mpfd, $parentfd, $last_dir);
1151 }
1152
1153 # use $rootdir = undef to just return the corresponding mount path
1154 sub mountpoint_mount {
1155     my ($mountpoint, $rootdir, $storage_cfg, $snapname) = @_;
1156
1157     my $volid = $mountpoint->{volume};
1158     my $mount = $mountpoint->{mp};
1159     my $type = $mountpoint->{type};
1160     my $quota = !$snapname && !$mountpoint->{ro} && $mountpoint->{quota};
1161     my $mounted_dev;
1162
1163     return if !$volid || !$mount;
1164
1165     $mount =~ s!/+!/!g;
1166
1167     my $mount_path;
1168     my ($mpfd, $parentfd, $last_dir);
1169
1170     if (defined($rootdir)) {
1171         ($rootdir, $mount_path, $mpfd, $parentfd, $last_dir) =
1172             __mount_prepare_rootdir($rootdir, $mount);
1173     }
1174
1175     my ($storage, $volname) = PVE::Storage::parse_volume_id($volid, 1);
1176
1177     die "unknown snapshot path for '$volid'" if !$storage && defined($snapname);
1178
1179     my $optstring = '';
1180     my $acl = $mountpoint->{acl};
1181     if (defined($acl)) {
1182         $optstring .= ($acl ? 'acl' : 'noacl');
1183     }
1184     my $readonly = $mountpoint->{ro};
1185
1186     my @extra_opts = ('-o', $optstring) if $optstring;
1187
1188     if ($storage) {
1189
1190         my $scfg = PVE::Storage::storage_config($storage_cfg, $storage);
1191
1192         # early sanity checks:
1193         # we otherwise call realpath on the rbd url
1194         die "containers on rbd storage without krbd are not supported\n"
1195             if $scfg->{type} eq 'rbd' && !$scfg->{krbd};
1196
1197         my $path = PVE::Storage::path($storage_cfg, $volid, $snapname);
1198
1199         my ($vtype, undef, undef, undef, undef, $isBase, $format) =
1200             PVE::Storage::parse_volname($storage_cfg, $volid);
1201
1202         $format = 'iso' if $vtype eq 'iso'; # allow to handle iso files
1203
1204         if ($format eq 'subvol') {
1205             if ($mount_path) {
1206                 if ($snapname) {
1207                     if ($scfg->{type} eq 'zfspool') {
1208                         my $path_arg = $path;
1209                         $path_arg =~ s!^/+!!;
1210                         PVE::Tools::run_command(['mount', '-o', 'ro', @extra_opts, '-t', 'zfs', $path_arg, $mount_path]);
1211                     } else {
1212                         die "cannot mount subvol snapshots for storage type '$scfg->{type}'\n";
1213                     }
1214                 } else {
1215                     if (defined($acl) && $scfg->{type} eq 'zfspool') {
1216                         my $acltype = ($acl ? 'acltype=posixacl' : 'acltype=noacl');
1217                         my (undef, $name) = PVE::Storage::parse_volname($storage_cfg, $volid);
1218                         $name .= "\@$snapname" if defined($snapname);
1219                         PVE::Tools::run_command(['zfs', 'set', $acltype, "$scfg->{pool}/$name"]);
1220                     }
1221                     bindmount($path, $parentfd, $last_dir//$rootdir, $mount_path, $readonly, @extra_opts);
1222                     warn "cannot enable quota control for bind mounted subvolumes\n" if $quota;
1223                 }
1224             }
1225             return wantarray ? ($path, 0, undef) : $path;
1226         } elsif ($format eq 'raw' || $format eq 'iso') {
1227             # NOTE: 'mount' performs canonicalization without the '-c' switch, which for
1228             # device-mapper devices is special-cased to use the /dev/mapper symlinks.
1229             # Our autodev hook expects the /dev/dm-* device currently
1230             # and will create the /dev/mapper symlink accordingly
1231             $path = Cwd::realpath($path);
1232             die "failed to get device path\n" if !$path;
1233             ($path) = ($path =~ /^(.*)$/s); #untaint
1234             my $domount = sub {
1235                 my ($path) = @_;
1236                 if ($mount_path) {
1237                     if ($format eq 'iso') {
1238                         PVE::Tools::run_command(['mount', '-o', 'ro', @extra_opts, $path, $mount_path]);
1239                     } elsif ($isBase || defined($snapname)) {
1240                         PVE::Tools::run_command(['mount', '-o', 'ro,noload', @extra_opts, $path, $mount_path]);
1241                     } else {
1242                         if ($quota) {
1243                             push @extra_opts, '-o', 'usrjquota=aquota.user,grpjquota=aquota.group,jqfmt=vfsv0';
1244                         }
1245                         push @extra_opts, '-o', 'ro' if $readonly;
1246                         PVE::Tools::run_command(['mount', @extra_opts, $path, $mount_path]);
1247                     }
1248                 }
1249             };
1250             my $use_loopdev = 0;
1251             if ($scfg->{path}) {
1252                 $mounted_dev = run_with_loopdev($domount, $path);
1253                 $use_loopdev = 1;
1254             } elsif ($scfg->{type} eq 'drbd' || $scfg->{type} eq 'lvm' ||
1255                      $scfg->{type} eq 'rbd' || $scfg->{type} eq 'lvmthin') {
1256                 $mounted_dev = $path;
1257                 &$domount($path);
1258             } else {
1259                 die "unsupported storage type '$scfg->{type}'\n";
1260             }
1261             return wantarray ? ($path, $use_loopdev, $mounted_dev) : $path;
1262         } else {
1263             die "unsupported image format '$format'\n";
1264         }
1265     } elsif ($type eq 'device') {
1266         push @extra_opts, '-o', 'ro' if $readonly;
1267         push @extra_opts, '-o', 'usrjquota=aquota.user,grpjquota=aquota.group,jqfmt=vfsv0' if $quota;
1268         # See the NOTE above about devicemapper canonicalization
1269         my ($devpath) = (Cwd::realpath($volid) =~ /^(.*)$/s); # realpath() taints
1270         PVE::Tools::run_command(['mount', @extra_opts, $volid, $mount_path]) if $mount_path;
1271         return wantarray ? ($volid, 0, $devpath) : $volid;
1272     } elsif ($type eq 'bind') {
1273         die "directory '$volid' does not exist\n" if ! -d $volid;
1274         bindmount($volid, $parentfd, $last_dir//$rootdir, $mount_path, $readonly, @extra_opts) if $mount_path;
1275         warn "cannot enable quota control for bind mounts\n" if $quota;
1276         return wantarray ? ($volid, 0, undef) : $volid;
1277     }
1278
1279     die "unsupported storage";
1280 }
1281
1282 sub mkfs {
1283     my ($dev, $rootuid, $rootgid) = @_;
1284
1285     PVE::Tools::run_command(['mkfs.ext4', '-O', 'mmp',
1286                              '-E', "root_owner=$rootuid:$rootgid",
1287                              $dev]);
1288 }
1289
1290 sub format_disk {
1291     my ($storage_cfg, $volid, $rootuid, $rootgid) = @_;
1292
1293     if ($volid =~ m!^/dev/.+!) {
1294         mkfs($volid);
1295         return;
1296     }
1297
1298     my ($storage, $volname) = PVE::Storage::parse_volume_id($volid, 1);
1299
1300     die "cannot format volume '$volid' with no storage\n" if !$storage;
1301
1302     PVE::Storage::activate_volumes($storage_cfg, [$volid]);
1303
1304     my $path = PVE::Storage::path($storage_cfg, $volid);
1305
1306     my ($vtype, undef, undef, undef, undef, $isBase, $format) =
1307         PVE::Storage::parse_volname($storage_cfg, $volid);
1308
1309     die "cannot format volume '$volid' (format == $format)\n"
1310         if $format ne 'raw';
1311
1312     mkfs($path, $rootuid, $rootgid);
1313 }
1314
1315 sub destroy_disks {
1316     my ($storecfg, $vollist) = @_;
1317
1318     foreach my $volid (@$vollist) {
1319         eval { PVE::Storage::vdisk_free($storecfg, $volid); };
1320         warn $@ if $@;
1321     }
1322 }
1323
1324 our $NEW_DISK_RE = qr/^([^:\s]+):(\d+(\.\d+)?)$/;
1325 sub create_disks {
1326     my ($storecfg, $vmid, $settings, $conf) = @_;
1327
1328     my $vollist = [];
1329
1330     eval {
1331         my (undef, $rootuid, $rootgid) = PVE::LXC::parse_id_maps($conf);
1332         my $chown_vollist = [];
1333
1334         PVE::LXC::Config->foreach_mountpoint($settings, sub {
1335             my ($ms, $mountpoint) = @_;
1336
1337             my $volid = $mountpoint->{volume};
1338             my $mp = $mountpoint->{mp};
1339
1340             my ($storage, $volname) = PVE::Storage::parse_volume_id($volid, 1);
1341
1342             if ($storage && ($volid =~ $NEW_DISK_RE)) {
1343                 my ($storeid, $size_gb) = ($1, $2);
1344
1345                 my $size_kb = int(${size_gb}*1024) * 1024;
1346
1347                 my $scfg = PVE::Storage::storage_config($storecfg, $storage);
1348                 # fixme: use better naming ct-$vmid-disk-X.raw?
1349
1350                 if ($scfg->{type} eq 'dir' || $scfg->{type} eq 'nfs') {
1351                     if ($size_kb > 0) {
1352                         $volid = PVE::Storage::vdisk_alloc($storecfg, $storage, $vmid, 'raw',
1353                                                            undef, $size_kb);
1354                         format_disk($storecfg, $volid, $rootuid, $rootgid);
1355                     } else {
1356                         $volid = PVE::Storage::vdisk_alloc($storecfg, $storage, $vmid, 'subvol',
1357                                                            undef, 0);
1358                         push @$chown_vollist, $volid;
1359                     }
1360                 } elsif ($scfg->{type} eq 'zfspool') {
1361
1362                     $volid = PVE::Storage::vdisk_alloc($storecfg, $storage, $vmid, 'subvol',
1363                                                        undef, $size_kb);
1364                     push @$chown_vollist, $volid;
1365                 } elsif ($scfg->{type} eq 'drbd' || $scfg->{type} eq 'lvm' || $scfg->{type} eq 'lvmthin') {
1366
1367                     $volid = PVE::Storage::vdisk_alloc($storecfg, $storage, $vmid, 'raw', undef, $size_kb);
1368                     format_disk($storecfg, $volid, $rootuid, $rootgid);
1369
1370                 } elsif ($scfg->{type} eq 'rbd') {
1371
1372                     die "krbd option must be enabled on storage type '$scfg->{type}'\n" if !$scfg->{krbd};
1373                     $volid = PVE::Storage::vdisk_alloc($storecfg, $storage, $vmid, 'raw', undef, $size_kb);
1374                     format_disk($storecfg, $volid, $rootuid, $rootgid);
1375                 } else {
1376                     die "unable to create containers on storage type '$scfg->{type}'\n";
1377                 }
1378                 push @$vollist, $volid;
1379                 $mountpoint->{volume} = $volid;
1380                 $mountpoint->{size} = $size_kb * 1024;
1381                 $conf->{$ms} = PVE::LXC::Config->print_ct_mountpoint($mountpoint, $ms eq 'rootfs');
1382             } else {
1383                 # use specified/existing volid/dir/device
1384                 $conf->{$ms} = PVE::LXC::Config->print_ct_mountpoint($mountpoint, $ms eq 'rootfs');
1385             }
1386         });
1387
1388         PVE::Storage::activate_volumes($storecfg, $chown_vollist, undef);
1389         foreach my $volid (@$chown_vollist) {
1390             my $path = PVE::Storage::path($storecfg, $volid, undef);
1391             chown($rootuid, $rootgid, $path);
1392         }
1393         PVE::Storage::deactivate_volumes($storecfg, $chown_vollist, undef);
1394     };
1395     # free allocated images on error
1396     if (my $err = $@) {
1397         destroy_disks($storecfg, $vollist);
1398         die $err;
1399     }
1400     return $vollist;
1401 }
1402
1403 # bash completion helper
1404
1405 sub complete_os_templates {
1406     my ($cmdname, $pname, $cvalue) = @_;
1407
1408     my $cfg = PVE::Storage::config();
1409
1410     my $storeid;
1411
1412     if ($cvalue =~ m/^([^:]+):/) {
1413         $storeid = $1;
1414     }
1415
1416     my $vtype = $cmdname eq 'restore' ? 'backup' : 'vztmpl';
1417     my $data = PVE::Storage::template_list($cfg, $storeid, $vtype);
1418
1419     my $res = [];
1420     foreach my $id (keys %$data) {
1421         foreach my $item (@{$data->{$id}}) {
1422             push @$res, $item->{volid} if defined($item->{volid});
1423         }
1424     }
1425
1426     return $res;
1427 }
1428
1429 my $complete_ctid_full = sub {
1430     my ($running) = @_;
1431
1432     my $idlist = vmstatus();
1433
1434     my $active_hash = list_active_containers();
1435
1436     my $res = [];
1437
1438     foreach my $id (keys %$idlist) {
1439         my $d = $idlist->{$id};
1440         if (defined($running)) {
1441             next if $d->{template};
1442             next if $running && !$active_hash->{$id};
1443             next if !$running && $active_hash->{$id};
1444         }
1445         push @$res, $id;
1446
1447     }
1448     return $res;
1449 };
1450
1451 sub complete_ctid {
1452     return &$complete_ctid_full();
1453 }
1454
1455 sub complete_ctid_stopped {
1456     return &$complete_ctid_full(0);
1457 }
1458
1459 sub complete_ctid_running {
1460     return &$complete_ctid_full(1);
1461 }
1462
1463 sub parse_id_maps {
1464     my ($conf) = @_;
1465
1466     my $id_map = [];
1467     my $rootuid = 0;
1468     my $rootgid = 0;
1469
1470     my $lxc = $conf->{lxc};
1471     foreach my $entry (@$lxc) {
1472         my ($key, $value) = @$entry;
1473         # FIXME: remove the 'id_map' variant when lxc-3.0 arrives
1474         next if $key ne 'lxc.idmap' && $key ne 'lxc.id_map';
1475         if ($value =~ /^([ug])\s+(\d+)\s+(\d+)\s+(\d+)\s*$/) {
1476             my ($type, $ct, $host, $length) = ($1, $2, $3, $4);
1477             push @$id_map, [$type, $ct, $host, $length];
1478             if ($ct == 0) {
1479                 $rootuid = $host if $type eq 'u';
1480                 $rootgid = $host if $type eq 'g';
1481             }
1482         } else {
1483             die "failed to parse idmap: $value\n";
1484         }
1485     }
1486
1487     if (!@$id_map && $conf->{unprivileged}) {
1488         # Should we read them from /etc/subuid?
1489         $id_map = [ ['u', '0', '100000', '65536'],
1490                     ['g', '0', '100000', '65536'] ];
1491         $rootuid = $rootgid = 100000;
1492     }
1493
1494     return ($id_map, $rootuid, $rootgid);
1495 }
1496
1497 sub userns_command {
1498     my ($id_map) = @_;
1499     if (@$id_map) {
1500         return ['lxc-usernsexec', (map { ('-m', join(':', @$_)) } @$id_map), '--'];
1501     }
1502     return [];
1503 }
1504
1505
1506 1;