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    配置 Nginx 支持 CGI

    發(fā)布時間:  2012/9/9 23:23:26
     安裝所需的 perl fcgi 模塊:

    apt-get install libfcgi-perl libfcgi-procmanager-perl

    用 perl 寫一個 daemon 程序來處理 cgi 文件:

    vi /usr/local/bin/cgiwrap-fcgi.pl

    #!/usr/bin/perl -w

    use FCGI;

    use Socket;

    use FCGI::ProcManager;

    sub shutdown { FCGI::CloseSocket($socket); exit; }

    sub restart { FCGI::CloseSocket($socket); &main; }

    use sigtrap 'handler', \&shutdown, 'normal-signals';

    use sigtrap 'handler', \&restart, 'HUP';

    require 'syscall.ph';

    use POSIX qw(setsid);

    #&daemonize; we don't daemonize when running under runsv

    #this keeps the program alive or something after exec'ing perl scripts

    END() { }

    BEGIN() { }

    {

    no warnings;

    *CORE::GLOBAL::exit = sub { die "fakeexit\nrc=" . shift() . "\n"; };

    };

    eval q{exit};

    if ($@) {

    exit unless $@ =~ /^fakeexit/;

    }

    &main;

    sub daemonize() {

    chdir '/' or die "Can't chdir to /: $!";

    defined( my $pid = fork ) or die "Can't fork: $!";

    exit if $pid;

    setsid() or die "Can't start a new session: $!";

    umask 0;

    }

    sub main {

    #$socket = FCGI::OpenSocket( "127.0.0.1:8999", 10 ); #use IP sockets

    #$socket = FCGI::OpenSocket( "/var/run/nginx/perl_cgi-dispatch.sock", 10 ); #use UNIX sockets - user running this script. must have w access to the 'nginx' folder!!

    #foreach $item (keys %ENV) { delete $ENV{$item}; }

    $proc_manager = FCGI::ProcManager->new( {n_processes => 5} );

    $socket = FCGI::OpenSocket( "127.0.0.1:8999", 10 )

    ; #use UNIX sockets - user running this script. must have w access to the 'nginx' folder!!

    $request =

    FCGI::Request( \*STDIN, \*STDOUT, \*STDERR, \%req_params, $socket,

    &FCGI::FAIL_ACCEPT_ON_INTR );

    $proc_manager->pm_manage();

    if ($request) { request_loop() }

    FCGI::CloseSocket($socket);

    }

    sub request_loop {

    while ( $request->Accept() >= 0 ) {

    $proc_manager->pm_pre_dispatch();

    #processing any STDIN input from WebServer (for CGI-POST actions)

    $stdin_passthrough = '';

    { no warnings; $req_len = 0 + $req_params{'CONTENT_LENGTH'}; };

    if ( ( $req_params{'REQUEST_METHOD'} eq 'POST' ) && ( $req_len != 0 ) )

    {

    my $bytes_read = 0;

    while ( $bytes_read < $req_len ) {

    my $data = '';

    my $bytes = read( STDIN, $data, ( $req_len - $bytes_read ) );

    last if ( $bytes == 0 || !defined($bytes) );

    $stdin_passthrough .= $data;

    $bytes_read += $bytes;

    }

    }

    #running the cgi app

    if (

    ( -x $req_params{SCRIPT_FILENAME} ) && #can I execute this?

    ( -s $req_params{SCRIPT_FILENAME} ) && #Is this file empty?

    ( -r $req_params{SCRIPT_FILENAME} ) #can I read this file?

    )

    {

    pipe( CHILD_RD, PARENT_WR );

    pipe( PARENT_ERR, CHILD_ERR );

    my $pid = open( CHILD_O, "-|" );

    unless ( defined($pid) ) {

    print("Content-type: text/plain\r\n\r\n");

    print

    "Error: CGI app returned no output - Executing $req_params{SCRIPT_FILENAME} failed !\n";

    next;

    }

    $oldfh = select(PARENT_ERR);

    $| = 1;

    select(CHILD_O);

    $| = 1;

    select($oldfh);

    if ( $pid > 0 ) {

    close(CHILD_RD);

    close(CHILD_ERR);

    print PARENT_WR $stdin_passthrough;

    close(PARENT_WR);

    $rin = $rout = $ein = $eout = '';

    vec( $rin, fileno(CHILD_O), 1 ) = 1;

    vec( $rin, fileno(PARENT_ERR), 1 ) = 1;

    $ein = $rin;

    $nfound = 0;

    while ( $nfound =

    select( $rout = $rin, undef, $ein = $eout, 10 ) )

    {

    die "$!" unless $nfound != -1;

    $r1 = vec( $rout, fileno(PARENT_ERR), 1 ) == 1;

    $r2 = vec( $rout, fileno(CHILD_O), 1 ) == 1;

    $e1 = vec( $eout, fileno(PARENT_ERR), 1 ) == 1;

    $e2 = vec( $eout, fileno(CHILD_O), 1 ) == 1;

    if ($r1) {

    while ( $bytes = read( PARENT_ERR, $errbytes, 4096 ) ) {

    print STDERR $errbytes;

    }

    if ($!) {

    $err = $!;

    die $!;

    vec( $rin, fileno(PARENT_ERR), 1 ) = 0

    unless ( $err == EINTR or $err == EAGAIN );

    }

    }

    if ($r2) {

    while ( $bytes = read( CHILD_O, $s, 4096 ) ) {

    print $s;

    }

    if ( !defined($bytes) ) {

    $err = $!;

    die $!;

    vec( $rin, fileno(CHILD_O), 1 ) = 0

    unless ( $err == EINTR or $err == EAGAIN );

    }

    }

    last if ( $e1 || $e2 );

    }

    close CHILD_RD;

    close PARENT_ERR;

    waitpid( $pid, 0 );

    } else {

    foreach $key ( keys %req_params ) {

    $ENV{$key} = $req_params{$key};

    }

    # cd to the script's local directory

    if ( $req_params{SCRIPT_FILENAME} =~ /^(.*)\/[^\/]+$/ ) {

    chdir $1;

    }

    close(PARENT_WR);

    #close(PARENT_ERR);

    close(STDIN);

    close(STDERR);

    #fcntl(CHILD_RD, F_DUPFD, 0);

    syscall( &SYS_dup2, fileno(CHILD_RD), 0 );

    syscall( &SYS_dup2, fileno(CHILD_ERR), 2 );

    #open(STDIN, "<&CHILD_RD");

    exec( $req_params{SCRIPT_FILENAME} );

    die("exec failed");

    }

    } else {

    print("Content-type: text/plain\r\n\r\n");

    print

    "Error: No such CGI app - $req_params{SCRIPT_FILENAME} may not exist or is not executable by this process.\n";

    }

    }

    }
    注意文件中的這兩行:

    #$socket = FCGI::OpenSocket( "127.0.0.1:8999", 10 );

    #$socket = FCGI::OpenSocket( "/var/run/nginx/perl_cgi-dispatch.sock", 10 );

    這兩行都表示監(jiān)聽來自 perl CGI 的請求。

    其中 perl_cgi-dispatch.sock 表示使用 unix socket 響應 CGI 請求。

    127.0.0.1:8999 表示使用 TCP/IP 協(xié)議響應請求。

    需要使用哪種方式就在下面的 FCGI::OpenSocket 中填入相對應的內(nèi)容。

    啟動:

    chmod +x /usr/local/bin/cgiwrap-fcgi.pl

    /usr/local/bin/cgiwrap-fcgi.pl > /dev/null 2>&1 &

    配置 Nginx 的 location 處理 cgi 文件:

    location ~ .*\.cgi$ {

    fastcgi_pass 127.0.0.1:8999;

    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;

    include fastcgi_params;

    }

    測試:

    在 web 的根目錄下創(chuàng)建一個 cgi 文件:

    vi test.cgi

    #!/usr/bin/perl

    print "Content-type: text/html\n\n";

    print "Hello, world.";

    文件需要有可執(zhí)行權(quán)限:

    chmod +x test.cgi

    訪問 http://www.domain.com/test.cgi 看看有沒有輸出。

    cgiwrap-fcgi.pl 隨 nginx 一起啟動/關(guān)閉:

    修改 nginx 啟動腳本:

    在 start 段加入:

    /usr/local/bin/cgiwrap-fcgi.pl > /dev/null 2>&1 &

    在 stop 段加入:

    PID=`/bin/netstat -npl | grep "127.0.0.1:8999" | awk '{print $7}' | cut -d "/" -f 1`

    while [ -n "$PID" ]

    do

    kill -9 "$PID"

    PID=`/bin/netstat -npl | grep "127.0.0.1:8999" | awk '{print $7}' | cut -d "/" -f 1`

    done

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