nginx 下的cgi

参考这篇文章 : Simple CGI 这个算是nginx的官方文档了。

要让nginx支持cgi必须添加一个守护接口来接受来自nginx的请求,就像php中的php5-fpm。这个守护接口是通过perl来实现的。

那个页面有具体的代码,同时需要安装几个perl的库。安全起见,还是把这个源码贴过来。由源码知,需要安装FCGI , FCGI-ProcManager
[code=’perl’]
#!perl
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);

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 {
$proc_manager = FCGI::ProcManager->new( {n_processes => 5} );
$socket = FCGI::OpenSocket( “/var/run/nginx/cgiwrap-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,
&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”; } } }

这个程序启动以后,会监听unix socket at /var/run/nginx/cgiwrap-dispatch.sock 。 只要在nginx中把请求转发到这里来即可。 下面是nginx的配置: [code=‘bash’] http { root /var/www/htdocs; index index.html; location ~ ^/cgi-bin/.*\.cgi$ { gzip off; #gzip makes scripts feel slower since they have to complete before getting gzipped fastcgi_pass unix:/var/run/nginx/cgiwrap-dispatch.sock; fastcgi_index index.cgi; fastcgi_param SCRIPT_FILENAME /var/www/cgi-bin$fastcgi_script_name; fastcgi_param QUERY_STRING $query_string; fastcgi_param REQUEST_METHOD $request_method; fastcgi_param CONTENT_TYPE $content_type; fastcgi_param CONTENT_LENGTH $content_length; fastcgi_param GATEWAY_INTERFACE CGI/1.1; fastcgi_param SERVER_SOFTWARE nginx; fastcgi_param SCRIPT_NAME $fastcgi_script_name; fastcgi_param REQUEST_URI $request_uri; fastcgi_param DOCUMENT_URI $document_uri; fastcgi_param DOCUMENT_ROOT $document_root; fastcgi_param SERVER_PROTOCOL $server_protocol; fastcgi_param REMOTE_ADDR $remote_addr; fastcgi_param REMOTE_PORT $remote_port; fastcgi_param SERVER_ADDR $server_addr; fastcgi_param SERVER_PORT $server_port; fastcgi_param SERVER_NAME $server_name; } }



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