在Nginx下运行perl-cgi脚本

On 2010年08月9日, in linux, by netoearth

Nginx不能像其他Web Server(例如Apache)那样直接运行perl-cgi的脚本。

试用几个不同的方法后,发现确实有方法可以比较简单的实现perl-cgi的功能:

首先下载一个Perl Wrapper,我把它另存为~/perl-fastcgi.pl。

修改perl-fastcgi.pl的属性,添加可执行权限。运行该文件,该脚本会创建一个/var/run/nginx/perl_cgi-dispatch.sock文件。

修改nginx的配置文件,在server section中添加:

1 location ~ \.cgi$ {
2 root           /srv/www/domain.tld/public_html;
3 fastcgi_pass    unix:/var/run/nginx/perl_cgi-dispatch.sock;
4 fastcgi_index   index.cgi;
5 fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
6 include         fastcgi_params;
7 }

配置工作就此完成,重新启动nginx即可。

perl-fastcgi.pl

#!/usr/bin/perl

use FCGI;
#perl -MCPAN -e ‘install FCGI’
use Socket;
use POSIX qw(setsid);
#use Fcntl;

require ‘syscall.ph’;

&daemonize;

#this keeps the program alive or something after exec’ing perl scripts
END() { } BEGIN() { }
*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!!
$request = FCGI::Request( \*STDIN, \*STDOUT, \*STDERR, \%req_params, $socket );
if ($request) { request_loop()};
FCGI::CloseSocket( $socket );
}

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

#processing any STDIN input from WebServer (for CGI-POST actions)
$stdin_passthrough =”;
$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);
my $pid = open(KID_TO_READ, “-|”);
unless(defined($pid)) {
print(“Content-type: text/plain\r\n\r\n”);
print “Error: CGI app returned no output – Executing $req_params{SCRIPT_FILENAME} failed !\n”;
next;
}
if ($pid > 0) {
close(CHILD_RD);
print PARENT_WR $stdin_passthrough;
close(PARENT_WR);

while(my $s = <KID_TO_READ>) { print $s; }
close KID_TO_READ;
waitpid($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(STDIN);
#fcntl(CHILD_RD, F_DUPFD, 0);
syscall(&SYS_dup2, fileno(CHILD_RD), 0);
#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”;
}

}
}

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