文章內容

配置 Nginx 支持 CGI

發布時間: 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.";

文件需要有可執行權限：

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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