配置nginx支持cgi

配置nginx支持cgi 2010-06-28 17:39:01

标签：nginx cgi

Nginx 不能直接执行外部可执行程序，如果要让 Nginx 支持 CGI，可以考虑安装
nginx-fcgi：
http://www./nginx-fcgi.html
当前版本为 nginx-fcgi-0.4.3，需要用到以下 perl 库：
perl-FCGI
perl-Getopt
perl-IO
perl-Socket
安装 perl-FCGI 、perl-FCGI-ProcManager 和 perl-IO-ALL：
wget http://www./modules/by-module/FCGI/FCGI-0.67.tar.gz
tar -zxf FCGI-0.67.tar.gz
cd FCGI-0.67
perl Makefile.PL
make && make install
cd ..
wget
http://search./CPAN/authors/id/G/GB/GBJK/FCGI-ProcManager-0.18.tar.gz
tar -zxf FCGI-ProcManager-0.18.tar.gz
cd FCGI-ProcManager-0.18
perl Makefile.PL
make && make install
cd ..
wget http://search./CPAN/authors/id/I/IN/INGY/IO-All-0.39.tar.gz
tar zxf IO-All-0.39.tar.gz
cd IO-All-0.39
perl Makefile.PL
make && make install
用 perl 写一个 daemon 程序来处理 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);
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( "127.0.0.1:8999", 10 );
$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();
$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;
}
}
if (
( -x $req_params{SCRIPT_FILENAME} ) &&
( -s $req_params{SCRIPT_FILENAME} ) &&
( -r $req_params{SCRIPT_FILENAME} )
)
{
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};
}
if ( $req_params{SCRIPT_FILENAME} =~
/^(.*)\/[^\/]+$/ ) {
chdir $1;
}
close(PARENT_WR);
close(STDIN);
close(STDERR);
syscall( &SYS_dup2, fileno(CHILD_RD), 0 );
syscall( &SYS_dup2, fileno(CHILD_ERR), 2 );
exec( $req_params{SCRIPT_FILENAME} );
die("exec failed");
}
} else {
print("Content-type: text/plain\r\n\r\n");
print
"Error: No such CGI app - $req_params{SCRIPT_FILENAME} may
not exist or is not executable by this process.\n";
}
}
}
注意文件中的这两行：
#$socket = FCGI::OpenSocket( "127.0.0.1:8999", 10 );
#$socket = FCGI::OpenSocket( "/var/run/nginx/perl_cgi-dispatch.sock",
10 );
这两行都表示监听来自 perl CGI 的请求。
其中 perl_cgi-dispatch.sock 表示使用 unix socket 响应 CGI 请求。
127.0.0.1:8999 表示使用 TCP/IP 协议响应请求。
需要使用哪种方式就在下面的 FCGI::OpenSocket 中填入相对应的内容。
启动：
chmod +x /usr/local/bin/cgiwrap-fcgi.pl
/usr/local/bin/cgiwrap-fcgi.pl > /dev/null 2>&1 &
配置 Nginx 的 location 处理 cgi 文件：
location ~ .*\.cgi$ {
fastcgi_pass 127.0.0.1:8999;
fastcgi_param SCRIPT_FILENAME $document_root$fastc
gi_script_name;
include fastcgi_params;
}
测试：
在 web 的根目录下创建一个 cgi 文件：
vi test.cgi
#!/usr/bin/perl
print "Content-type: text/html\n\n";
print "Hello, world.";
文件需要有可执行权限：
chmod +x test.cgi
访问 http://www./test.cgi 看看有没有输出。
添加进/etc/rc.local，随系统启动而启动：
/usr/local/bin/cgiwrap-fcgi.pl > /dev/null 2>&1