This file is indexed.

/usr/share/perl5/Net/Server/HTTP.pm is in libnet-server-perl 2.009-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
# -*- perl -*-
#
#  Net::Server::HTTP - Extensible Perl HTTP base server
#
#  Copyright (C) 2010-2017
#
#    Paul Seamons <paul@seamons.com>
#
#  This package may be distributed under the terms of either the
#  GNU General Public License
#    or the
#  Perl Artistic License
#
################################################################

package Net::Server::HTTP;

use strict;
use base qw(Net::Server::MultiType);
use Scalar::Util qw(weaken blessed);
use IO::Handle ();
use re 'taint'; # most of our regular expressions setting ENV should not be clearing taint
use POSIX ();
use Time::HiRes qw(time);
my $has_xs_parser;
BEGIN {$has_xs_parser = $ENV{'USE_XS_PARSER'} && eval { require HTTP::Parser::XS } };

sub net_server_type { __PACKAGE__ }

sub options {
    my $self = shift;
    my $ref  = $self->SUPER::options(@_);
    my $prop = $self->{'server'};
    $ref->{$_} = \$prop->{$_} for qw(timeout_header timeout_idle server_revision max_header_size
                                     access_log_format access_log_file enable_dispatch);
    return $ref;
}

sub timeout_header  { shift->{'server'}->{'timeout_header'}  }
sub timeout_idle    { shift->{'server'}->{'timeout_idle'}    }
sub server_revision { shift->{'server'}->{'server_revision'} }
sub max_header_size { shift->{'server'}->{'max_header_size'} }

sub default_port { 80 }

sub default_server_type { 'PreFork' }

sub post_configure {
    my $self = shift;
    $self->SUPER::post_configure(@_);
    my $prop = $self->{'server'};

    # set other defaults
    my $d = {
        timeout_header  => 15,
        timeout_idle    => 60,
        server_revision => __PACKAGE__."/$Net::Server::VERSION",
        max_header_size => 100_000,
        access_log_format => '%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"',
    };
    $prop->{$_} = $d->{$_} foreach grep {!defined($prop->{$_})} keys %$d;

    $self->_init_access_log;

    $self->_tie_client_stdout;
}

sub post_bind {
    my $self = shift;
    $self->SUPER::post_bind(@_);

    $self->_check_dispatch;
}

sub _init_access_log {
    my $self = shift;
    my $prop = $self->{'server'};
    my $log = $prop->{'access_log_file'};
    return if ! $log || $log eq '/dev/null';
    return if ! $prop->{'access_log_format'};
    $prop->{'access_log_format'} =~ s/\\([\\\"nt])/$1 eq 'n' ? "\n" : $1 eq 't' ? "\t" : $1/eg;
    if ($log eq 'STDERR') {
        $prop->{'access_log_function'} = sub { print STDERR @_,"\n" };
    } else {
        open my $fh, '>>', $log or die "Could not open access_log_file \"$log\": $!";
        $fh->autoflush(1);
        push @{ $prop->{'chown_files'} }, $log;
        $prop->{'access_log_function'} = sub { print $fh @_,"\n" };
    }
}

sub _tie_client_stdout {
    my $self = shift;
    my $prop = $self->{'server'};

    # install a callback that will handle our outbound header negotiation for the clients similar to what apache does for us
    my $copy = $self;
    $prop->{'tie_client_stdout'} = 1;
    $prop->{'tied_stdout_callback'} = sub {
        my $client = shift;
        my $method = shift;
        alarm($copy->timeout_idle); # reset timeout

        my $request_info = $copy->{'request_info'};
        if ($request_info->{'headers_sent'}) { # keep track of how much has been printed
            my ($resp, $len);
            if ($method eq 'print') {
                $resp = $client->print(my $str = join '', @_);
                $len = length $str;
            } elsif ($method eq 'printf') {
                $resp = $client->print(my $str = sprintf(shift, @_));
                $len = length $str;
            } elsif ($method eq 'say') {
                $resp = $client->print(my $str = join '', @_, "\n");
                $len = length $str;
            } elsif ($method eq 'write') {
                my $buf = shift;
                $buf = substr($buf, $_[1] || 0, $_[0]) if @_;
                $resp = $client->print($buf);
                $len = length $buf;
            } elsif ($method eq 'syswrite') {
                $len = $resp = $client->syswrite(@_);
            } else {
                return $client->$method(@_);
            }
            $request_info->{'response_size'} = ($request_info->{'response_size'} || 0) + $len if defined $len;
            return $resp;
        }

        die "All headers must only be sent via print ($method)\n" if $method ne 'print';

        my $headers = ${*$client}{'headers'} ||= {unparsed => '', parsed => ''};
        $headers->{'unparsed'} .= join('', @_);
        while ($headers->{'unparsed'} =~ s/^(.*?)\015?\012//) {
            my $line = $1;

            if (!$headers->{'parsed'} && $line =~ m{^HTTP/(1.[01]) \s+ (\d+) (?: | \s+ .+)$ }x) {
                $headers->{'status'} = [];
                $headers->{'parsed'} .= "$line\015\012";
                $prop->{'request_info'}->{'http_version'} = $1;
                $prop->{'request_info'}->{'response_status'} = $2;
            }
            elsif (! length $line) {
                my $s = $headers->{'status'} || die "Premature end of script headers\n";
                delete ${*$client}{'headers'};
                $copy->send_status(@$s) if @$s;
                $client->print($headers->{'parsed'}."\015\012");
                $request_info->{'headers_sent'} = 1;
                $request_info->{'response_header_size'} += length($headers->{'parsed'})+2;
                $request_info->{'response_size'} = length($headers->{'unparsed'});
                return $client->print($headers->{'unparsed'});
            } elsif ($line !~ s/^(\w+(?:-(?:\w+))*):\s*//) {
                my $invalid = ($line =~ /(.{0,120})/) ? "$1..." : '';
                $invalid =~ s/</&lt;/g;
                die "Premature end of script headers: $invalid<br>\n";
            } else {
                my $key = "\u\L$1";
                $key =~ y/_/-/;
                push @{ $request_info->{'response_headers'} }, [$key, $line];
                if ($key eq 'Status' && $line =~ /^(\d+) (?:|\s+(.+?))$/ix) {
                    $headers->{'status'} = [$1, $2 || '-'];
                }
                elsif ($key eq 'Location') {
                    $headers->{'status'} = [302, 'bouncing'];
                }
                elsif ($key eq 'Content-type') {
                    $headers->{'status'} ||= [200, 'OK'];
                }
                $headers->{'parsed'} .= "$key: $line\015\012";
            }
        }
    };
    weaken $copy;
}

sub _check_dispatch {
    my $self = shift;
    if (! $self->{'server'}->{'enable_dispatch'}) {
        return if __PACKAGE__->can('process_request') ne $self->can('process_request');
        return if __PACKAGE__->can('process_http_request') ne $self->can('process_http_request');
    }

    my $app = $self->{'server'}->{'app'};
    if (! $app || (ref($app) eq 'ARRAY' && !@$app)) {
        $app = [];
        $self->configure({app => $app});
    }

    my %dispatch;
    my $first;
    my @dispatch;
    foreach my $a (ref($app) eq 'ARRAY' ? @$app : $app) {
        next if ! $a;
        my @pairs = ref($a) eq 'ARRAY' ? @$a
                  : ref($a) eq 'HASH'  ? %$a
                  : ref($a) eq 'CODE'  ? ('/', $a)
                  : $a =~ m{^(.+?)\s+(.+)$} ? ($1, $2)
                  : $a =~ m{^(.+?)=(.+)$}   ? ($1, $2)
                  : ($a, $a);
        for (my $i = 0; $i < @pairs; $i+=2) {
            my ($key, $val) = ("/$pairs[$i]", $pairs[$i+1]);
            $key =~ s{/\./}{/}g;
            $key =~ s{(?:/[^/]+|)/\../}{/}g;
            $key =~ s{//+}{/}g;
            if ($dispatch{$key}) {
                $self->log(2, "Already found a path matching \"$key\" - skipping.");
                next;
            }
            $dispatch{$key} = $val;
            push @dispatch, $key;
            $first ||= $key;
            $self->log(2, "  Dispatch: $key => $val");
        }
    }
    if (@dispatch) {
        if (! $dispatch{'/'} && $first) {
            $dispatch{'/'} = $dispatch{$first};
            push @dispatch, '/';
            $self->log(2, "  Dispatch: / => $dispatch{$first} (default)");
        }
        $self->{'dispatch_qr'} = join "|", map {"\Q$_\E"} @dispatch;
        $self->{'dispatch'} = \%dispatch;
    }
}

sub http_base_headers {
    my $self = shift;
    return [
        [Date => gmtime()." GMT"],
        [Connection => 'close'],
        [Server => $self->server_revision],
    ];
}

sub send_status {
    my ($self, $status, $msg, $body) = @_;
    $msg ||= ($status == 200) ? 'OK' : '-';
    my $request_info = $self->{'request_info'};

    my $out = "HTTP/1.0 $status $msg\015\012";
    foreach my $row (@{ $self->http_base_headers }) {
        $out .= "$row->[0]: $row->[1]\015\012";
        push @{ $request_info->{'response_headers'} }, $row;
    }
    $self->{'server'}->{'client'}->print($out);
    $request_info->{'http_version'} = '1.0';
    $request_info->{'response_status'} = $status;
    $request_info->{'response_header_size'} += length $out;

    if ($body) {
        push @{ $request_info->{'response_headers'} }, ['Content-type', 'text/html'];
        $out = "Content-type: text/html\015\012\015\012";
        $request_info->{'response_header_size'} += length $out;
        $self->{'server'}->{'client'}->print($out);
        $request_info->{'headers_sent'} = 1;
        $self->{'server'}->{'client'}->print($body);
        $request_info->{'response_size'} += length $body;
    }
}

sub send_500 {
    my ($self, $err) = @_;
    $self->send_status(500, 'Internal Server Error',
                       "<h1>Internal Server Error</h1><p>$err</p>");
}

###----------------------------------------------------------------###

sub run_client_connection {
    my $self = shift;
    local $self->{'request_info'} = {};
    return $self->SUPER::run_client_connection(@_);
}

sub get_client_info {
    my $self = shift;
    $self->SUPER::get_client_info(@_);
    $self->clear_http_env;
}

sub clear_http_env {
    my $self = shift;
    %ENV = ();
}

sub process_request {
    my $self = shift;
    my $client = shift || $self->{'server'}->{'client'};

    my $ok = eval {
        local $SIG{'ALRM'} = sub { die "Server Timeout on headers\n" };
        alarm($self->timeout_header);
        $self->process_headers($client);

        $SIG{'ALRM'} = sub { die "Server Timeout on process\n" };
        alarm($self->timeout_idle);
        $self->process_http_request($client);

        alarm(0);
        1;
    };
    alarm(0);

    if (! $ok) {
        my $err = "$@" || "Something happened";
        $self->log(1, $err);
        $self->send_500($err);
    }
}

sub script_name { shift->{'script_name'} || '' }

sub process_headers {
    my $self = shift;
    my $client = shift || $self->{'server'}->{'client'};

    $ENV{'REMOTE_PORT'} = $self->{'server'}->{'peerport'};
    $ENV{'REMOTE_ADDR'} = $self->{'server'}->{'peeraddr'};
    $ENV{'SERVER_PORT'} = $self->{'server'}->{'sockport'};
    $ENV{'SERVER_ADDR'} = $self->{'server'}->{'sockaddr'};
    $ENV{'HTTPS'} = 'on' if $self->{'server'}->{'client'}->NS_proto =~ /SSL/;

    my ($ok, $headers) = $client->read_until($self->max_header_size, qr{\n\r?\n});
    my ($req, $len, @parsed);
    die "Could not parse http headers successfully\n" if $ok != 1;
    if ($has_xs_parser) {
        $len = HTTP::Parser::XS::parse_http_request($headers, \%ENV);
        die "Corrupt request" if $len == -1;
        die "Incomplete request" if $len == -2;
        $req = "$ENV{'REQUEST_METHOD'} $ENV{'REQUEST_URI'} $ENV{'SERVER_PROTOCOL'}";
    } else {
        ($req, my @lines) = split /\r?\n/, $headers;
        die "Missing request\n" if ! defined $req;

        if (!defined($req) || $req !~ m{ ^\s*(GET|POST|PUT|DELETE|PUSH|HEAD|OPTIONS)\s+(.+)\s+(HTTP/1\.[01])\s*$ }ix) {
            die "Invalid request\n";
        }
        $ENV{'REQUEST_METHOD'}  = uc $1;
        $ENV{'REQUEST_URI'}     = $2;
        $ENV{'SERVER_PROTOCOL'} = $3;
        $ENV{'QUERY_STRING'}    = $1 if $ENV{'REQUEST_URI'} =~ m{ \?(.*)$ }x;
        $ENV{'PATH_INFO'}       = $1 if $ENV{'REQUEST_URI'} =~ m{^([^\?]+)};

        foreach my $l (@lines) {
            my ($key, $val) = split /\s*:\s*/, $l, 2;
            push @parsed, [$key, $val];
            $key = uc($key);
            $key = 'COOKIE' if $key eq 'COOKIES';
            $key =~ y/-/_/;
            $key =~ s/^\s+//;
            $key = "HTTP_$key" if $key !~ /^CONTENT_(?:LENGTH|TYPE)$/;
            $val =~ s/\s+$//;
            if (exists $ENV{$key}) {
                $ENV{$key} .= ", $val";
            } else {
                $ENV{$key} = $val;
            }
        }
        $len = length $headers;
    }
    $ENV{'SCRIPT_NAME'} = $self->script_name($ENV{'PATH_INFO'}) || '';

    my $type = $Net::Server::HTTP::ISA[0];
    $type = $Net::Server::MultiType::ISA[0] if $type eq 'Net::Server::MultiType';
    $ENV{'NET_SERVER_TYPE'} = $type;
    $ENV{'NET_SERVER_SOFTWARE'} = $self->server_revision;

    $self->_init_http_request_info($req, \@parsed, $len);
}

sub http_request_info { shift->{'request_info'} }

sub _init_http_request_info {
    my ($self, $req, $parsed, $len) = @_;
    my $prop = $self->{'server'};
    my $info = $self->{'request_info'};
    @$info{qw(sockaddr sockport peeraddr peerport)} = @$prop{qw(sockaddr sockport peeraddr peerport)};
    $info->{'peerhost'} = $prop->{'peerhost'} || $info->{'peeraddr'};
    $info->{'begin'} = time;
    $info->{'request'} = $req;
    $info->{'request_headers'} = $parsed;
    $info->{'query_string'} = "?$ENV{'QUERY_STRING'}" if defined $ENV{'QUERY_STRING'};
    $info->{'request_protocol'} = $ENV{'HTTPS'} ? 'https' : 'http';
    $info->{'request_method'} = $ENV{'REQUEST_METHOD'};
    $info->{'request_path'} = $ENV{'PATH_INFO'};
    $info->{'request_header_size'} = $len;
    $info->{'request_size'} = $ENV{'CONTENT_LENGTH'} || 0; # we might not actually read entire request
    $info->{'remote_user'} = '-';
}

sub http_note {
    my ($self, $key, $val) = @_;
    return $self->{'request_info'}->{'notes'}->{$key} = $val if @_ >= 3;
    return $self->{'request_info'}->{'notes'}->{$key};
}

sub http_dispatch {
    my ($self, $dispatch_qr, $dispatch_table) = @_;

    $ENV{'PATH_INFO'} =~ s{^($dispatch_qr)(?=/|$|(?<=/))}{} or die "Dispatch not found\n";
    $ENV{'SCRIPT_NAME'} = $1;
    if ($ENV{'PATH_INFO'}) {
        $ENV{'PATH_INFO'} = "/$ENV{'PATH_INFO'}" if $ENV{'PATH_INFO'} !~ m{^/};
        $ENV{'PATH_INFO'} =~ s/%([a-fA-F0-9]{2})/chr(hex $1)/eg;
    }
    my $code = $self->{'dispatch'}->{$1};
    return $self->$code() if ref $code;
    $self->exec_cgi($code);
}

sub process_http_request {
    my ($self, $client) = @_;

    if (my $table = $self->{'dispatch'}) {
        my $qr = $self->{'dispatch_qr'} or die "Dispatch was not correctly setup\n";
        return $self->http_dispatch($qr, $table)
    }

    return $self->http_echo;
}

sub http_echo {
    my $self = shift;
    print "Content-type: text/html\n\n";
    print "<form method=post action=/bam><input type=text name=foo><input type=submit></form>\n";
    if (eval { require Data::Dumper }) {
        local $Data::Dumper::Sortkeys = 1;
        my $form = {};
        if (eval { require CGI }) {  my $q = CGI->new; $form->{$_} = $q->param($_) for $q->param;  }
        print "<pre>".Data::Dumper->Dump([\%ENV, $form], ['*ENV', 'form'])."</pre>";
    }
}

sub post_process_request {
    my $self = shift;
    my $info = $self->{'request_info'};
    $info->{'begin'} = time unless defined $info->{'begin'};
    $info->{'elapsed'} = time - $info->{'begin'};
    $self->SUPER::post_process_request(@_);
    $self->log_http_request($info);
}

###----------------------------------------------------------------###

sub log_http_request {
    my ($self, $info) = @_;
    my $prop = $self->{'server'};
    my $fmt  = $prop->{'access_log_format'} || return;
    my $log  = $prop->{'access_log_function'} || return;
    $log->($self->http_log_format($fmt, $info));
}

my %fmt_map = qw(
    a peeraddr
    A sockaddr
    B response_size
    f filename
    h peerhost
    H request_protocol
    l remote_logname
    m request_method
    p sockport
    q query_string
    r request
    s response_status
    u remote_user
    U request_path
    );
my %fmt_code = qw(
    C http_log_cookie
    e http_log_env
    i http_log_header_in
    n http_log_note
    o http_log_header_out
    P http_log_pid
    t http_log_time
    v http_log_vhost
    V http_log_vhost
    X http_log_constat
);

sub http_log_format {
    my ($self, $fmt, $info, $orig) = @_;
    $fmt =~ s{ % ([<>])?                      # 1
                 (!? \d\d\d (?:,\d\d\d)* )?   # 2
                 (?: \{ ([^\}]+) \} )?        # 3
                 ([aABDfhHmpqrsTuUvVhblPtIOCeinoPtX%])  # 4
    }{
        $info = $orig if $1 && $orig && $1 eq '<';
        my $v = $2 && (substr($2,0,1) eq '!' ? index($2, $info->{'response_status'})!=-1 : index($2, $info->{'response_status'})==-1) ? '-'
              : $fmt_map{$4}  ? $info->{$fmt_map{$4}}
              : $fmt_code{$4} ? do { my $m = $fmt_code{$4}; $self->$m($info, $3, $1, $4) }
              : $4 eq 'b'     ? $info->{'response_size'} || '-' # B can be 0, b cannot
              : $4 eq 'I'     ? $info->{'request_size'} + $info->{'request_header_size'}
              : $4 eq 'O'     ? $info->{'response_size'} + $info->{'response_header_size'}
              : $4 eq 'T'     ? sprintf('%d', $info->{'elapsed'})
              : $4 eq 'D'     ? sprintf('%d', $info->{'elapsed'}/.000_001)
              : $4 eq '%'     ? '%'
              : '-';
        $v = '-' if !defined($v) || !length($v);
        $v =~ s/([^\ -\!\#-\[\]-\~])/$1 eq "\n" ? '\n' : $1 eq "\t" ? '\t' : sprintf('\x%02X', ord($1))/eg; # escape non-printable or " or \
        $v;
    }gxe;
    return $fmt;
}
sub http_log_time {
    my ($self, $info, $fmt) = @_;
    return '['.POSIX::strftime($fmt || '%d/%b/%Y:%T %z', localtime($info->{'begin'})).']';
}
sub http_log_env { $ENV{$_[2]} }
sub http_log_cookie {
    my ($self, $info, $var) = @_;
    my @c;
    for my $cookie (map {$_->[1]} grep {$_->[0] eq 'Cookie' } @{ $info->{'request_headers'} || [] }) {
        push @c, $1 if $cookie =~ /^\Q$var\E=(.*)/;
    }
    return join ', ', @c;
}
sub http_log_header_in {
    my ($self, $info, $var) = @_;
    return join ', ', map {$_->[1]} grep {$_->[0] eq $var} @{ $info->{'request_headers'} || [] };
}
sub http_log_note {
    my ($self, $info, $var) = @_;
    return $self->http_note($var);
}
sub http_log_header_out {
    my ($self, $info, $var) = @_;
    return join ', ', map {$_->[1]} grep {$_->[0] eq $var} @{ $info->{'response_headers'} || [] };
}
sub http_log_pid { $_[1]->{'pid'} || $$ } # we do not support tid yet
sub http_log_vhost {
    my ($self, $info, $fmt, $f_l, $type) = @_;
    return $self->http_log_header_in($info, 'Host') || $self->{'server'}->{'client'}->NS_host || $self->{'server'}->{'sockaddr'};
}
sub http_log_constat {
    my ($self, $info) = @_;
    return $info->{'headers_sent'} ? '-' : 'X';
}

###----------------------------------------------------------------###

sub exec_fork_hook {}

sub exec_trusted_perl {
    my ($self, $file) = @_;
    die "File $file is not executable\n" if ! -x $file;
    local $!;
    my $pid = fork;
    die "Could not spawn child process: $!\n" if ! defined $pid;
    $self->exec_fork_hook($pid, $file, 1);
    if (!$pid) {
        if (!eval { require $file }) {
            my $err = "$@" || "Error while running trusted perl script\n";
            $err =~ s{\s*Compilation failed in require at lib/Net/Server/HTTP\.pm line \d+\.\s*\z}{\n};
            die $err if !$self->{'request_info'}->{'headers_sent'};
            warn $err;
        }
        exit;
    } else {
        waitpid $pid, 0;
        return;
    }
}

sub exec_cgi {
    my ($self, $file) = @_;

    my $done = 0;
    my $pid;
    Net::Server::SIG::register_sig(CHLD => sub {
        while (defined(my $chld = waitpid(-1, POSIX::WNOHANG()))) {
            $done = ($? >> 8) || -1 if $pid == $chld;
            last unless $chld > 0;
        }
    });

    require IPC::Open3;
    require Symbol;
    my $in;
    my $out;
    my $err = Symbol::gensym();
    local $!;
    $pid = eval { IPC::Open3::open3($in, $out, $err, $file) } or die "Could not run external script $file: $!\n";
    $self->exec_fork_hook($pid, $file); # won't occur for the child
    my $len = $ENV{'CONTENT_LENGTH'} || 0;
    my $s_in  = $len ? IO::Select->new($in) : undef;
    my $s_out = IO::Select->new($out, $err);
    my $printed;
    while (!$done) {
        my ($o, $i, $e) = IO::Select->select($s_out, $s_in, undef);
        Net::Server::SIG::check_sigs();
        for my $fh (@$o) {
            read($fh, my $buf, 4096) || next;
            if ($fh == $out) {
                print $buf;
                $printed ||= 1;
            } else {
                print STDERR $buf;
            }
        }
        if (@$i) {
            my $bytes = read(STDIN, my $buf, $len);
            print $in $buf if $bytes;
            $len -= $bytes;
            $s_in = undef if $len <= 0;
        }
    }
    if (!$self->{'request_info'}->{'headers_sent'}) {
        if (!$printed) {
            $self->send_500("Premature end of script headers");
        } elsif ($done > 0) {
            $self->send_500("Script exited unsuccessfully");
        }
    }

    Net::Server::SIG::unregister_sig('CHLD');
}

1;

__END__

=head1 NAME

Net::Server::HTTP - very basic Net::Server based HTTP server class

=head1 TEST ONE LINER

    perl -e 'use base qw(Net::Server::HTTP); main->run(port => 8080)'
    # will start up an echo server

=head1 SYNOPSIS

    use base qw(Net::Server::HTTP);
    __PACKAGE__->run;

    sub process_http_request {
        my $self = shift;

        print "Content-type: text/html\n\n";
        print "<form method=post action=/bam><input type=text name=foo><input type=submit></form>\n";

        require Data::Dumper;
        local $Data::Dumper::Sortkeys = 1;

        require CGI;
        my $form = {};
        my $q = CGI->new; $form->{$_} = $q->param($_) for $q->param;

        print "<pre>".Data::Dumper->Dump([\%ENV, $form], ['*ENV', 'form'])."</pre>";
    }

=head1 DESCRIPTION

Even though Net::Server::HTTP doesn't fall into the normal parallel of
the other Net::Server flavors, handling HTTP requests is an often
requested feature and is a standard and simple protocol.

Net::Server::HTTP begins with base type MultiType defaulting to
Net::Server::Fork.  It is easy to change it to any of the other
Net::Server flavors by passing server_type => $other_flavor in the
server configuration.  The port has also been defaulted to port 80 -
but could easily be changed to another through the server
configuration.  You can also very easily add ssl by including,
proto=>"ssl" and provide a SSL_cert_file and SSL_key_file.

For example, here is a basic server that will bind to all interfaces,
will speak both HTTP on port 8080 as well as HTTPS on 8443, and will
speak both IPv4, as well as IPv6 if it is available.

    use base qw(Net::Server::HTTP);

    __PACKAGE__->run(
        port  => [8080, "8443/ssl"],
        ipv   => '*', # IPv6 if available
        SSL_key_file  => '/my/key',
        SSL_cert_file => '/my/cert',
    );

=head1 METHODS

=over 4

=item C<_init_access_log>

Used to open and initialize any requested access_log (see access_log_file
and access_log_format).

=item C<_tie_client_stdout>

Used to initialize automatic response header parsing.

=item C<process_http_request>

Will be passed the client handle, and will have STDOUT and STDIN tied
to the client.

During this method, the %ENV will have been set to a standard CGI
style environment.  You will need to be sure to print the Content-type
header.  This is one change from the other standard Net::Server base
classes.

During this method you can read from %ENV and STDIN just like a normal
HTTP request in other web servers.  You can print to STDOUT and
Net::Server will handle the header negotiation for you.

Note: Net::Server::HTTP has no concept of document root or script
aliases or default handling of static content.  That is up to the
consumer of Net::Server::HTTP to work out.

Net::Server::HTTP comes with a basic %ENV display installed as the
default process_http_request method.

=item C<process_request>

This method has been overridden in Net::Server::HTTP - you should not
use it while using Net::Server::HTTP.  This overridden method parses
the environment and sets up request alarms and handles dying failures.
It calls process_http_request once the request is ready and headers
have been parsed.

=item C<process_headers>

Used to read in the incoming headers and set the ENV.

=item C<_init_http_request_info>

Called at the end of process_headers.  Initializes the contents of
http_request_info.

=item C<http_request_info>

Returns a hashref of information specific to the current request.
This information will be used for logging later on.

=item C<send_status>

Takes an HTTP status and a message.  Sends out the correct headers.

=item C<send_500>

Calls send_status with 500 and the argument passed to send_500.

=item c<log_http_request>

Called at the end of post_process_request.  The default method looks
for the default access_log_format and checks if logging was initialized
during _init_access_log.  If both of these exist, the http_request_info
is formatted using http_log_format and the result is logged.

=item C<http_log_format>

Takes a format string, and request_info and returns a formatted string.
The format should follow the apache mod_log_config specification.  As in
the mod_log_config specification, backslashes, quotes should be escaped
with backslashes and you may also include \n and \t characters as well.

The following is a listing of the available parameters as well as sample
output based on a very basic HTTP server.

    %%                %                 # a percent
    %a                ::1               # remote ip
    %A                ::1               # local ip
    %b                83                # response size (- if 0) Common Log Format
    %B                83                # response size
    %{bar}C           baz               # value of cookie by that name
    %D                916               # elapsed in microseconds
    %{HTTP_COOKIE}e   bar=baz           # value of %ENV by that name
    %f                -                 # filename - unused
    %h                ::1               # remote host if lookups are on, remote ip otherwise
    %H                http              # request protocol
    %{Host}i          localhost:8080    # request header by that name
    %I                336               # bytes received including headers
    %l                -                 # remote logname - unsused
    %m                GET               # request method
    %n                Just a note       # http_note by that name
    %{Content-type}o  text/html         # output header by that name
    %O                189               # response size including headers
    %p                8080              # server port
    %P                22999             # pid - does not support %{tid}P
    q                 ?hello=there      # query_string including ? (- otherwise)
    r                 GET /bam?hello=there HTTP/1.1      # the first line of the request
    %s                200               # response status
    %u                -                 # remote user - unused
    %U                /bam              # request path (no query string)
    %t                [06/Jun/2012:12:14:21 -0600]       # http_log_time standard format
    %t{%F %T %z}t     [2012-06-06 12:14:21 -0600]        # http_log_time with format
    %T                0                 # elapsed time in seconds
    %v                localhost:8080    # http_log_vhost - partial implementation
    %V                localhost:8080    # http_log_vhost - partial implementation
    %X                -                 # Connection completed and is 'close' (-)

Additionally, the log parsing allows for the following formats.

    %>s               200               # status of last request
    %<s               200               # status of original request
    %400a             -                 # remote ip if status is 400
    %!400a            ::1               # remote ip if status is not 400
    %!200a            -                 # remote ip if status is not 200

There are few bits not completely implemented:

    > and <    # There is no internal redirection
    %I         # The answer to this is based on header size and Content-length
                 instead of the more correct actual number of bytes read though
                 in common cases those would be the same.
    %X         # There is no Connection keepalive in the default server.
    %v and %V  # There are no virtual hosts in the default HTTP server.
    %{tid}P    # The default servers are not threaded.

See the C<access_log_format> option for how to set a different format as
well as to see the default string.

=item C<exec_cgi>

Allow for calling an external script as a CGI.  This will use IPC::Open3 to
fork a new process and read/write from it.

    use base qw(Net::Server::HTTP);
    __PACKAGE__->run;

    sub process_http_request {
        my $self = shift;

        if ($ENV{'PATH_INFO'} && $ENV{'PATH_INFO'} =~ s{^ (/foo) (?= $ | /) }{}x) {
           $ENV{'SCRIPT_NAME'} = $1;
           my $file = "/var/www/cgi-bin/foo"; # assuming this exists
           return $self->exec_cgi($file);
        }

        print "Content-type: text/html\n\n";
        print "<a href=/foo>Foo</a>";
    }

At this first release, the parent server is not tracking the child
script which may cause issues if the script is running when a HUP is
received.

=item C<http_log_time>

Used to implement the %t format.

=item C<http_log_env>

Used to implement the %e format.

=item C<http_log_cookie>

Used to implement the %C format.

=item C<http_log_header_in>

used to implement the %i format.

=item C<http_log_note>

Used to implement the %n format.

=item C<http_note>

Takes a key and an optional value.  If passed a key and value, sets
the note for that key.  Always returns the value.  These notes
currently only are used for %{key}n output format.

=item C<http_log_header_out>

Used to implement the %o format.

=item C<http_log_pid>

Used to implement the %P format.

=item C<http_log_vhost>

Used to implement the %v and %V formats.

=item C<http_log_constat>

Used to implement the %X format.

=item C<exec_trusted_perl>

Allow for calling an external perl script.  This method will still
fork, but instead of using IPC::Open3, it simply requires the perl
script.  That means that the running script will be able to make use
of any shared memory.  It also means that the STDIN/STDOUT/STDERR
handles the script is using are those directly bound by the server
process.

    use base qw(Net::Server::HTTP);
    __PACKAGE__->run;

    sub process_http_request {
        my $self = shift;

        if ($ENV{'PATH_INFO'} && $ENV{'PATH_INFO'} =~ s{^ (/foo) (?= $ | /) }{}x) {
           $ENV{'SCRIPT_NAME'} = $1;
           my $file = "/var/www/cgi-bin/foo"; # assuming this exists
           return $self->exec_trusted_perl($file);
        }

        print "Content-type: text/html\n\n";
        print "<a href=/foo>Foo</a>";
    }

At this first release, the parent server is not tracking the child
script which may cause issues if the script is running when a HUP is
received.

=item C<exec_fork_hook>

This method is called after the fork of exec_trusted_perl and exec_cgi
hooks.  It is passed the pid (0 if the child) and the file being ran.
Note, that the hook will not be called from the child during exec_cgi.

=item C<http_dispatch>

Called if the default process_http_request and process_request methods
have not been overridden and C<app> configuration parameters have been
passed.  In this case this replaces the default echo server.  You can
also enable this subsystem for your own direct use by setting
enable_dispatch to true during configuration.  See the C<app>
configuration item.  It will be passed a dispatch qr (regular
expression) generated during _check_dispatch, and a dispatch table.
The qr will be applied to path_info.  This mechanism could be used to
augment Net::Server::HTTP with document root and virtual host
capabilities.

=back

=head1 OPTIONS

In addition to the command line arguments of the Net::Server base
classes you can also set the following options.

=over 4

=item max_header_size

Defaults to 100_000.  Maximum number of bytes to read while parsing
headers.

=item server_revision

Defaults to Net::Server::HTTP/$Net::Server::VERSION.

=item timeout_header

Defaults to 15 - number of seconds to wait for parsing headers.

=item timeout_idle

Defaults to 60 - number of seconds a request can be idle before the
request is closed.

=item access_log_file

Defaults to undef.  If true, this represents the location of where
the access log should be written to.  If a special value of STDERR
is passed, the access log entry will be writing to the same location
as the ERROR log.

=item access_log_format

Should be a valid apache log format that will be passed to http_log_format.  See
the http_log_format method for more information.

The default value is the NCSA extended/combined log format:

    '%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"'

=item app

Takes one or more items and registers them for dispatch.  Arguments
may be supplied as an arrayref containing a location/target pairs, a
hashref containing a location/target pairs, a bare code ref that will
use "/" as the location and the codref as the target, a string with a space
indicating "location target", a string containing "location=target", or
finally a string that will be used as both location and target.  For items
passed as an arrayref or hashref, the target may be a coderef which
will be called and should handle the request.  In all other cases the
target should be a valid executable suitable for passing to exec_cgi.

The locations will be added in the order that they are configured.
They will be added to a regular expression which will be applied to
the incoming PATH_INFO string.  If the match is successful, the
$ENV{'SCRIPT_NAME'} will be set to the matched portion and the matched
portion will be removed from $ENV{'PATH_INFO'}.

Once an app has been passed, it is necessary for the server to listen
on /.  Therefore if "/" has not been specifically configured for
dispatch, the first found dispatch target will also be used to handle
"/".

For convenience, if the log_level is 2 or greater, the dispatch table
is output to the log.

This mechanism is left as a generic mechanism suitable for overriding
by servers meant to handle more complex dispatch.  At the moment there
is no handling of virtual hosts.  At some point we will add in the
default ability to play static content and likely for the ability to
configure virtual hosts - or that may have to wait for a third party
module.

    app => "/home/paul/foo.cgi",
      # Dispatch: /home/paul/foo.cgi => home/paul/foo.cgi
      # Dispatch: / => home/paul/foo.cgi (default)


    app => "../../foo.cgi",
    app => "./bar.cgi",
    app => "baz ./bar.cgi",
    app => "bim=./bar.cgi",
      # Dispatch: /foo.cgi => ../../foo.cgi
      # Dispatch: /bar.cgi => ./bar.cgi
      # Dispatch: /baz => ./bar.cgi
      # Dispatch: /bim => ./bar.cgi
      # Dispatch: / => ../../foo.cgi (default)


    app => "../../foo.cgi",
    app => "/=./bar.cgi",
      # Dispatch: /foo.cgi => ../../foo.cgi
      # Dispatch: / => ./bar.cgi

    # you could also do this on the commandline
    net-server HTTP app ../../foo.cgi app /=./bar.cgi

    # extended options when configured from code

    Net::Server::HTTP->run(app => { # loses order of matching
      '/' => sub { ... },
      '/foo' => sub { ... },
      '/bar' => '/path/to/some.cgi',
    });

    Net::Server::HTTP->run(app => [
      '/' => sub { ... },
      '/foo' => sub { ... },
      '/bar' => '/path/to/some.cgi',
    ]);

=back

=head1 TODO

Add support for writing out HTTP/1.1.

=head1 AUTHOR

Paul T. Seamons paul@seamons.com

=head1 THANKS

See L<Net::Server>

=head1 SEE ALSO

Please see also
L<Net::Server::Fork>,
L<Net::Server::INET>,
L<Net::Server::PreFork>,
L<Net::Server::PreForkSimple>,
L<Net::Server::MultiType>,
L<Net::Server::Single>
L<Net::Server::SIG>
L<Net::Server::Daemonize>
L<Net::Server::Proto>

=cut