src/PVE/ProcFSTools.pm

   1 package PVE::ProcFSTools;
   2
   3 use strict;
   4 use warnings;
   5 use POSIX;
   6 use Time::HiRes qw (gettimeofday);
   7 use IO::File;
   8 use PVE::Tools;
   9 use Cwd qw();
  10
  11 use Socket qw(PF_INET PF_INET6 SOCK_DGRAM IPPROTO_IP);
  12
  13 use constant IFF_UP => 1;
  14 use constant IFNAMSIZ => 16;
  15 use constant SIOCGIFFLAGS => 0x8913;
  16
  17 my $clock_ticks = POSIX::sysconf(&POSIX::_SC_CLK_TCK);
  18
  19 my $cpuinfo;
  20
  21 sub read_cpuinfo {
  22     my $fn = '/proc/cpuinfo';
  23
  24     return $cpuinfo if $cpuinfo;
  25
  26     my $res = {
  27         user_hz => $clock_ticks,
  28         model => 'unknown',
  29         mhz => 0,
  30         cpus => 1,
  31         sockets => 1,
  32         flags => '',
  33     };
  34
  35     my $fh = IO::File->new ($fn, "r");
  36     return $res if !$fh;
  37
  38     my $idhash = {};
  39     my $count = 0;
  40     while (defined(my $line = <$fh>)) {
  41         if ($line =~ m/^processor\s*:\s*\d+\s*$/i) {
  42             $count++;
  43         } elsif ($line =~ m/^model\s+name\s*:\s*(.*)\s*$/i) {
  44             $res->{model} = $1 if $res->{model} eq 'unknown';
  45         } elsif ($line =~ m/^cpu\s+MHz\s*:\s*(\d+\.\d+)\s*$/i) {
  46             $res->{mhz} = $1 if !$res->{mhz};
  47         } elsif ($line =~ m/^flags\s*:\s*(.*)$/) {
  48             $res->{flags} = $1 if !length $res->{flags};
  49         } elsif ($line =~ m/^physical id\s*:\s*(\d+)\s*$/i) {
  50             $idhash->{$1} = 1;
  51         }
  52     }
  53
  54     # Hardware Virtual Machine (Intel VT / AMD-V)
  55     $res->{hvm} = $res->{flags} =~ m/\s(vmx|svm)\s/;
  56
  57     $res->{sockets} = scalar(keys %$idhash) || 1;
  58
  59     $res->{cpus} = $count;
  60
  61     $fh->close;
  62
  63     $cpuinfo = $res;
  64
  65     return $res;
  66 }
  67
  68 sub read_proc_uptime {
  69     my $ticks = shift;
  70
  71     my $line = PVE::Tools::file_read_firstline("/proc/uptime");
  72     if ($line && $line =~ m|^(\d+\.\d+)\s+(\d+\.\d+)\s*$|) {
  73         if ($ticks) {
  74             return (int($1*$clock_ticks), int($2*$clock_ticks));
  75         } else {
  76             return (int($1), int($2));
  77         }
  78     }
  79
  80     return (0, 0);
  81 }
  82
  83 sub read_loadavg {
  84
  85     my $line = PVE::Tools::file_read_firstline('/proc/loadavg');
  86
  87     if ($line =~ m|^(\d+\.\d+)\s+(\d+\.\d+)\s+(\d+\.\d+)\s+\d+/\d+\s+\d+\s*$|) {
  88         return wantarray ? ($1, $2, $3) : $1;
  89     }
  90
  91     return wantarray ? (0, 0, 0) : 0;
  92 }
  93
  94 my $last_proc_stat;
  95
  96 sub read_proc_stat {
  97     my $res = { user => 0, nice => 0, system => 0, idle => 0 , sum => 0};
  98
  99     my $cpucount = 0;
 100
 101     if (my $fh = IO::File->new ("/proc/stat", "r")) {
 102         while (defined (my $line = <$fh>)) {
 103             if ($line =~ m|^cpu\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)\s|) {
 104                 $res->{user} = $1;
 105                 $res->{nice} = $2;
 106                 $res->{system} = $3;
 107                 $res->{idle} = $4;
 108                 $res->{used} = $1+$2+$3;
 109                 $res->{iowait} = $5;
 110             } elsif ($line =~ m|^cpu\d+\s|) {
 111                 $cpucount++;
 112             }
 113         }
 114         $fh->close;
 115     }
 116
 117     $cpucount = 1 if !$cpucount;
 118
 119     my $ctime = gettimeofday; # floating point time in seconds
 120
 121     $res->{ctime} = $ctime;
 122     $res->{cpu} = 0;
 123     $res->{wait} = 0;
 124
 125     $last_proc_stat = $res if !$last_proc_stat;
 126
 127     my $diff = ($ctime - $last_proc_stat->{ctime}) * $clock_ticks * $cpucount;
 128
 129     if ($diff > 1000) { # don't update too often
 130         my $useddiff =  $res->{used} - $last_proc_stat->{used};
 131         $useddiff = $diff if $useddiff > $diff;
 132         $res->{cpu} = $useddiff/$diff;
 133         my $waitdiff =  $res->{iowait} - $last_proc_stat->{iowait};
 134         $waitdiff = $diff if $waitdiff > $diff;
 135         $res->{wait} = $waitdiff/$diff;
 136         $last_proc_stat = $res;
 137     } else {
 138         $res->{cpu} = $last_proc_stat->{cpu};
 139         $res->{wait} = $last_proc_stat->{wait};
 140     }
 141
 142     return $res;
 143 }
 144
 145 sub read_proc_pid_stat {
 146     my $pid = shift;
 147
 148     my $statstr = PVE::Tools::file_read_firstline("/proc/$pid/stat");
 149
 150     if ($statstr && $statstr =~ m/^$pid \(.*\) (\S) (-?\d+) -?\d+ -?\d+ -?\d+ -?\d+ \d+ \d+ \d+ \d+ \d+ (\d+) (\d+) (-?\d+) (-?\d+) -?\d+ -?\d+ -?\d+ 0 (\d+) (\d+) (-?\d+) \d+ \d+ \d+ \d+ \d+ \d+ \d+ \d+ \d+ \d+ \d+ \d+ \d+ -?\d+ -?\d+ \d+ \d+ \d+/) {
 151         return {
 152             status => $1,
 153             utime => $3,
 154             stime => $4,
 155             starttime => $7,
 156             vsize => $8,
 157             rss => $9 * 4096,
 158         };
 159     }
 160
 161     return undef;
 162 }
 163
 164 sub check_process_running {
 165     my ($pid, $pstart) = @_;
 166
 167     # note: waitpid only work for child processes, but not
 168     # for processes spanned by other processes.
 169     # kill(0, pid) return succes for zombies.
 170     # So we read the status form /proc/$pid/stat instead
 171
 172     my $info = read_proc_pid_stat($pid);
 173
 174     return $info && (!$pstart || ($info->{starttime} eq $pstart)) && ($info->{status} ne 'Z') ? $info : undef;
 175 }
 176
 177 sub read_proc_starttime {
 178     my $pid = shift;
 179
 180     my $info = read_proc_pid_stat($pid);
 181     return $info ? $info->{starttime} : 0;
 182 }
 183
 184 sub read_meminfo {
 185
 186     my $res = {
 187         memtotal => 0,
 188         memfree => 0,
 189         memused => 0,
 190         memshared => 0,
 191         swaptotal => 0,
 192         swapfree => 0,
 193         swapused => 0,
 194     };
 195
 196     my $fh = IO::File->new ("/proc/meminfo", "r");
 197     return $res if !$fh;
 198
 199     my $d = {};
 200     while (my $line = <$fh>) {
 201         if ($line =~ m/^(\S+):\s+(\d+)\s*kB/i) {
 202             $d->{lc ($1)} = $2 * 1024;
 203         }
 204     }
 205     close($fh);
 206
 207     $res->{memtotal} = $d->{memtotal};
 208     $res->{memfree} =  $d->{memfree} + $d->{buffers} + $d->{cached};
 209     $res->{memused} = $res->{memtotal} - $res->{memfree};
 210
 211     $res->{swaptotal} = $d->{swaptotal};
 212     $res->{swapfree} = $d->{swapfree};
 213     $res->{swapused} = $res->{swaptotal} - $res->{swapfree};
 214
 215     my $spages = PVE::Tools::file_read_firstline("/sys/kernel/mm/ksm/pages_sharing");
 216     $res->{memshared} = int($spages) * 4096;
 217
 218     return $res;
 219 }
 220
 221 # memory usage of current process
 222 sub read_memory_usage {
 223
 224     my $res = { size => 0, resident => 0, shared => 0 };
 225
 226     my $ps = 4096;
 227
 228     my $line = PVE::Tools::file_read_firstline("/proc/$$/statm");
 229
 230     if ($line =~ m/^(\d+)\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)\s*/) {
 231         $res->{size} = $1*$ps;
 232         $res->{resident} = $2*$ps;
 233         $res->{shared} = $3*$ps;
 234     }
 235
 236     return $res;
 237 }
 238
 239 sub read_proc_net_dev {
 240
 241     my $res = {};
 242
 243     my $fh = IO::File->new ("/proc/net/dev", "r");
 244     return $res if !$fh;
 245
 246     while (defined (my $line = <$fh>)) {
 247         if ($line =~ m/^\s*(.*):\s*(\d+)\s+\d+\s+\d+\s+\d+\s+\d+\s+\d+\s+\d+\s+\d+\s+(\d+)\s+/) {
 248             $res->{$1} = {
 249                 receive => $2,
 250                 transmit => $3,
 251             };
 252         }
 253     }
 254
 255     close($fh);
 256
 257     return $res;
 258 }
 259
 260 sub write_proc_entry {
 261     my ($filename, $data) = @_;#
 262
 263     my $fh = IO::File->new($filename,  O_WRONLY);
 264     die "unable to open file '$filename' - $!\n" if !$fh;
 265     die "unable to write '$filename' - $!\n" unless print $fh $data;
 266     die "closing file '$filename' failed - $!\n" unless close $fh;
 267     $fh->close();
 268 }
 269
 270 sub read_proc_net_route {
 271     my $filename = "/proc/net/route";
 272
 273     my $res = [];
 274
 275     my $fh = IO::File->new ($filename, "r");
 276     return $res if !$fh;
 277
 278     my $int_to_quad = sub {
 279        return join '.' => map { ($_[0] >> 8*(3-$_)) % 256 } (3, 2, 1, 0);
 280     };
 281
 282     while (defined(my $line = <$fh>)) {
 283        next if $line =~/^Iface\s+Destination/; # skip head
 284        my ($iface, $dest, $gateway, $metric, $mask, $mtu) = (split(/\s+/, $line))[0,1,2,6,7,8];
 285        push @$res, {
 286            dest => &$int_to_quad(hex($dest)),
 287            gateway => &$int_to_quad(hex($gateway)),
 288            mask => &$int_to_quad(hex($mask)),
 289            metric => $metric,
 290            mtu => $mtu,
 291            iface => $iface,
 292        };
 293     }
 294
 295     return $res;
 296 }
 297
 298 sub read_proc_mounts {
 299     return PVE::Tools::file_get_contents("/proc/mounts", 512*1024);
 300 }
 301
 302 # mounts encode spaces (\040), tabs (\011), newlines (\012), backslashes (\\ or \134)
 303 sub decode_mount {
 304     my ($str) = @_;
 305     return $str =~ s/\\(?:040|01[12]|134|\\)/"\"$&\""/geer;
 306 }
 307
 308 sub parse_mounts {
 309     my ($mounts) = @_;
 310     my $mntent = [];
 311     while ($mounts =~ /^\s*([^#].*)$/gm) {
 312         # lines from the file are encoded so we can just split at spaces
 313         my ($what, $dir, $fstype, $opts) = split(/[ \t]/, $1, 4);
 314         my ($freq, $passno) = (0, 0);
 315         # in glibc's parser frequency and pass seem to be optional
 316         $freq = $1 if $opts =~ s/\s+(\d+)$//;
 317         $passno = $1 if $opts =~ s/\s+(\d+)$//;
 318         push @$mntent, [decode_mount($what),
 319                         decode_mount($dir),
 320                         decode_mount($fstype),
 321                         decode_mount($opts),
 322                         $freq, $passno];
 323     }
 324     return $mntent;
 325 }
 326
 327 sub parse_proc_mounts {
 328     return parse_mounts(read_proc_mounts());
 329 }
 330
 331 sub is_mounted {
 332     my ($mountpoint) = @_;
 333
 334     $mountpoint = Cwd::realpath($mountpoint);
 335
 336     return 0 if !defined($mountpoint); # path does not exist
 337
 338     my $mounts = parse_proc_mounts();
 339     return (grep { $_->[1] eq $mountpoint } @$mounts) ? 1 : 0;
 340 }
 341
 342 sub read_proc_net_ipv6_route {
 343     my $filename = "/proc/net/ipv6_route";
 344
 345     my $res = [];
 346
 347     my $fh = IO::File->new ($filename, "r");
 348     return $res if !$fh;
 349
 350     my $read_v6addr = sub { $_[0] =~ s/....(?!$)/$&:/gr };
 351
 352     # ipv6_route has no header
 353     while (defined(my $line = <$fh>)) {
 354         my ($dest, $prefix, $nexthop, $metric, $iface) = (split(/\s+/, $line))[0,1,4,5,9];
 355         push @$res, {
 356             dest => &$read_v6addr($dest),
 357             prefix => hex("$prefix"),
 358             gateway => &$read_v6addr($nexthop),
 359             metric => hex("$metric"),
 360             iface => $iface
 361         };
 362     }
 363
 364     return $res;
 365 }
 366
 367 sub upid_wait {
 368     my ($upid, $waitfunc, $sleep_intervall) = @_;
 369
 370     my $task = PVE::Tools::upid_decode($upid);
 371
 372     $sleep_intervall = $sleep_intervall ? $sleep_intervall : 1;
 373
 374     my $next_time = time + $sleep_intervall;
 375
 376     while (check_process_running($task->{pid}, $task->{pstart})) {
 377
 378         if (time >= $next_time && $waitfunc && ref($waitfunc) eq 'CODE'){
 379             &$waitfunc($task);
 380             $next_time = time + $sleep_intervall;
 381         }
 382
 383         CORE::sleep(1);
 384     }
 385 }
 386
 387 # struct ifreq { // FOR SIOCGIFFLAGS:
 388 #   char ifrn_name[IFNAMSIZ]
 389 #   short ifru_flags
 390 # };
 391 my $STRUCT_IFREQ_SIOCGIFFLAGS = 'Z' . IFNAMSIZ . 's1';
 392 sub get_active_network_interfaces {
 393     # Use the interface name list from /proc/net/dev
 394     open my $fh, '<', '/proc/net/dev'
 395         or die "failed to open /proc/net/dev: $!\n";
 396     # And filter by IFF_UP flag fetched via a PF_INET6 socket ioctl:
 397     my $sock;
 398     socket($sock, PF_INET6, SOCK_DGRAM, &IPPROTO_IP)
 399     or socket($sock, PF_INET, SOCK_DGRAM, &IPPROTO_IP)
 400     or return [];
 401
 402     my $ifaces = [];
 403     while(defined(my $line = <$fh>)) {
 404         next if $line !~ /^\s*([^:\s]+):/;
 405         my $ifname = $1;
 406         my $ifreq = pack($STRUCT_IFREQ_SIOCGIFFLAGS, $ifname, 0);
 407         if (!defined(ioctl($sock, SIOCGIFFLAGS, $ifreq))) {
 408             warn "failed to get interface flags for: $ifname\n";
 409             next;
 410         }
 411         my ($name, $flags) = unpack($STRUCT_IFREQ_SIOCGIFFLAGS, $ifreq);
 412         push @$ifaces, $ifname if ($flags & IFF_UP);
 413     }
 414     close $fh;
 415     close $sock;
 416     return $ifaces;
 417 }
 418
 419 1;