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        配置 Nginx 支持 CGI

        發(fā)布時間:  2012/9/11 13:01:30
        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(yīng) CGI 請求。

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

        需要使用哪種方式就在下面的 FCGI::OpenSocket 中填入相對應(yīng)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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