getting plain cgi scripts working with nginx setup

.gitignore

@@ -1,5 +1,7 @@
 */*.log
 */*.pid
+*/*.sock
 
 web/nginx.conf
+web/cgiwrap-fcgi.pl
 web/*_temp/*

web/Makefile

@@ -1,16 +1,29 @@
 
 ROOT ?= $(PWD)
 HTTP_PORT ?= 49228
+NGINX_CONF_IN := nginx.conf.in
+ALL_NGINX_CONF_INPUTS := \
+	$(NGINX_CONF_IN) \
+	$(wildcard perl_requirements.d/*) \
+	$(wildcard perl_locations.d/*)
 
 
 serve: nginx.conf
 	nginx -p $(ROOT)/ -c $(ROOT)/$<
 
 
-nginx.conf: nginx.conf.in
+nginx.conf: $(ALL_NGINX_CONF_INPUTS)
 	cat $< |  \
 	sed -e 's@__ROOT__@$(ROOT)@g' \
 	    -e 's@__HTTP_PORT__@$(HTTP_PORT)@g' > $@
 
 
-.PHONY: serve
+serve-cgiwrap: cgiwrap-fcgi.pl
+	perl $<
+
+
+cgiwrap-fcgi.pl: cgiwrap-fcgi.pl.in
+	cat $< | sed -e 's@__ROOT__@$(ROOT)@g' > $@
+
+
+.PHONY: serve serve-cgiwrap

web/cgiwrap-fcgi.pl.in

@@ -0,0 +1,155 @@
+#!/usr/bin/env 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("__ROOT__/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";
+    }
+  }
+}

web/html/cgi-bin/test.cgi

@@ -0,0 +1,7 @@
+#!/usr/bin/env perl
+
+printf("Content-Type: text/plain\n\n");
+printf("Hello Test\n");
+
+1;
+__END__

web/lib/perl/base.pm

@@ -1,17 +1,35 @@
 package base;
+
+use strict;
+use warnings;
 use nginx;
 
 
 sub handler {
-    my $r = shift;
-    $r->send_http_header("text/plain");
-    return OK if $r->header_only;
+    my $r = shift();
 
-    $r->print("hello!\n");
-    $r->rflush;
+    $r->send_http_header("text/plain");
+    return OK if $r->header_only();
+
+    $r->print("Hello There!\n");
+    $r->rflush();
 
     if (-f $r->filename or -d _) {
         $r->print($r->uri, " exists!\n");
+    } else {
+        $r->print($r->uri, " does not exist!\n");
+    }
+
+    my $directory = '/home/me/tmp';
+    # '/home/me/src/LearningPerl/src/web';
+
+    my $didopen = opendir(DIR, $directory);
+    if ($didopen) {
+        while (my $file = readdir(DIR)) {
+            $r->print("$file\n");
+        }
+
+        closedir(DIR);
     }
 }
 

web/nginx.conf.in

@@ -24,14 +24,40 @@ http {
     autoindex on;
 
     server {
+        root __ROOT__/html;
+        index index.html;
+
         listen __HTTP_PORT__;
         server_name localhost;
         access_log __ROOT__/access.log main;
-        root __ROOT__/html;
 
         include __ROOT__/perl_locations.d/*;
+
+        location ~ ^/cgi-bin/.*\.cgi$ {
+            gzip off;
+            fastcgi_pass  unix:__ROOT__/nginx-cgiwrap-dispatch.sock;
+            fastcgi_index index.cgi;
+            fastcgi_param SCRIPT_FILENAME __ROOT__/html$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;
         }
     }
 
+}
+
 
 # vim:filetype=nginx

web/perl_locations.d/base.conf

@@ -1,4 +1,4 @@
-location / {
+location /embedded {
     perl base::handler;
 }