<?php
    function interact($msgsock, $use_crypto=false)
    {
	global $CONFIG,$logdir,$lockdir,$logfile,$installed_path,$config_path,$config_dir,$groupconfig,$workpath,$path, $spooldir,$nntp_group,$nntp_article,$auth_ok,$user,$pass;

	$workpath=$spooldir."/";
	$path=$workpath."articles/";
	$groupconfig=$spooldir."/spoolnews/groups.txt";

    $logfile=$logdir.'/nntp.log'; 
    $nntp_group="";
    $nntp_article="";
/* CRYPTO */
    stream_set_blocking($msgsock, true);
    if($use_crypto) {
        $cryptoSetup = stream_socket_enable_crypto($msgsock, TRUE, STREAM_CRYPTO_METHOD_TLSv1_0_SERVER | STREAM_CRYPTO_METHOD_TLSv1_1_SERVER | STREAM_CRYPTO_METHOD_TLSv1_2_SERVER);
    }
    stream_set_timeout($msgsock, 300);
    $client = stream_socket_get_name($msgsock, 1);
    $client_ip = explode(':', $client);
    if(strpos($CONFIG['open_clients'], $client_ip[0]) !== false) {
	$auth_ok = 1;
    }
    /* Send instructions. */
    $msg = "200 Rocksolid Light NNTP Server ready (no posting)\r\n";
    fwrite($msgsock, $msg, strlen($msg)); 
    do {   
	$msg="";	
set_time_limit(30);
	$buf = fgets($msgsock, 2048);
        if(file_exists($config_dir."/nntp.disable")) {
           $parent_pid = file_get_contents($lockdir.'/rslight-nntp.lock', IGNORE_NEW_LINES);
           posix_kill($parent_pid, SIGTERM);
           exit;
        }
        if ($buf === false) {
//            file_put_contents($logfile, "\n".format_log_date()." socket read failed: reason: " . socket_strerror(socket_last_error($msgsock)), FILE_APPEND); 
	    break;
        }
set_time_limit(0);
        $buf = trim($buf); 
	if (strlen($buf) < 1) {
            continue;
        }
	if(stripos($buf, 'AUTHINFO PASS') !== false) {
	  file_put_contents($logfile, "\n".format_log_date()." ".$client." AUTHINFO PASS (hidden)", FILE_APPEND);
	} else {
	  file_put_contents($logfile, "\n".format_log_date()." ".$client." ".$buf, FILE_APPEND);
	}
	$command = explode(' ', $buf);
	$command[0] = strtolower($command[0]);
	if(isset($command[1])) {
  	  $command[1] = strtolower($command[1]);
	}
	if ($command[0] == 'date') {
          $msg = '111 '.date('YmdHis')."\r\n";
          fwrite($msgsock, $msg, strlen($msg));
          continue;
        }
	if ($command[0] == 'list') {
	    if(isset($command[1])) {
	        $msg = get_list($command[1], $msgsock);
            } else {
		$msg = get_list("active", $msgsock);
            } 
            fwrite($msgsock, $msg, strlen($msg));
	    continue;
	}
	if ($command[0] == 'post') {
	    if($auth_ok == 0) {
	        $msg = "480 Posting not permitted\r\n";	
		fwrite($msgsock, $msg, strlen($msg));
                continue;
	    }
	    $msg = "340 Send article to be posted\r\n";
	    $tempfilename = tempnam(sys_get_temp_dir(), '');
	    $tempfilehandle = fopen($tempfilename, 'wb');
	    fwrite($msgsock, $msg, strlen($msg));
	    $buf = fgets($msgsock, 2048);
	    while (trim($buf) !== '.') {
		fwrite($tempfilehandle, $buf);
		$buf = fgets($msgsock, 2048);
	    }
	    fclose($tempfilehandle);
	    $msg = prepare_post($tempfilename);
	    fwrite($msgsock, $msg, strlen($msg));     
	    continue;
	}
		if ($command[0] == 'capabilities') {
		  $msg = "101 Capability list:\r\n";
		  $msg.= "VERSION 2\r\n";
		  $msg.= "AUTHINFO USER\r\n";
		  $msg.= "HDR\r\n";
		  $msg.= "LIST ACTIVE HEADERS NEWSGROUPS OVERVIEW.FMT\r\n";
	      if($auth_ok == '1') {
			$msg.= "POST\r\n";
		  }
          $msg.= "OVER\r\n";
          $msg.= "READER\r\n";
          $msg.= ".\r\n";
          fwrite($msgsock, $msg, strlen($msg));
          continue;
        }
	
	if ($command[0] == 'newgroups') {
            $msg = get_newgroups($command);
            fwrite($msgsock, $msg, strlen($msg));
            continue;
        }
	if ($command[0] == 'next') {
	    $msg = get_next($nntp_group);
	    fwrite($msgsock, $msg, strlen($msg));
	    continue;
	}
        if ($command[0] == 'last') {
            $msg = get_last($nntp_group);
            fwrite($msgsock, $msg, strlen($msg));
            continue;
        }
	if ($command[0] == 'authinfo') {
	  if(!isset($command[2])) {
	    $command[2] = fgets($msgsock, 2048);
	  } 
          if($command[1] == 'user') {
            $user = $command[2];
	    if(isset($command[3])) {
		$user = $user." ".$command[3];
	    }
            $msg="381 Enter password\r\n";
	    fwrite($msgsock, $msg, strlen($msg));
            continue;
          } 
	  if ($command[1] == 'pass') {
            if($user == "") {
              $msg="482 Authentication commands issued out of sequence\r\n";
            } else {
              $pass = $command[2];
	      if (check_bbs_auth($user,$pass)) {
	        $auth_ok = 1;
                $msg="281 Authentication succeeded\r\n";
	      } else {
	        $auth_ok = 0;
	        $msg="481 Authentication failed\r\n";
	      }
            }
	    fwrite($msgsock, $msg, strlen($msg));
            continue;
	  }
	  $msg="501 Syntax error\r\n";
          fwrite($msgsock, $msg, strlen($msg));
          continue;
        }
	if ($command[0] == 'mode') {
	    $msg = "200 Rocksolid Light NNRP Server ready (no posting)\r\n";
	    fwrite($msgsock, $msg, strlen($msg));
	    continue;
	}
	if ($command[0] == 'stat') {
            $msg = get_stat($command[1]);
            fwrite($msgsock, $msg, strlen($msg));
            continue;
        }
	if ($command[0] == 'article') {
	    $msg = get_article($command[1], $nntp_group);
	    fwrite($msgsock, $msg, strlen($msg));
	    continue;
	}
	if ($command[0] == 'head') {
            $msg = get_header($command[1], $nntp_group);
            fwrite($msgsock, $msg, strlen($msg));
            continue;
        }
	if ($command[0] == 'body') {
            $msg = get_body($command[1], $nntp_group);
            fwrite($msgsock, $msg, strlen($msg));
            continue;
        }
        if ($command[0] == 'listgroup') {
	    if(isset($command[1])) {            
		$nntp_group=$command[1];
	    }
            $msg = get_listgroup($nntp_group, $msgsock);
            fwrite($msgsock, $msg, strlen($msg));
            continue;
        }
	if ($command[0] == 'group') {
	    $change_group=$command[1];
	    $msg = get_group($change_group);
	    fwrite($msgsock, $msg, strlen($msg));
	    continue;
	}
	if ($command[0] == 'xgtitle') {
            if(isset($command[1])) {
                $msg = get_title($command[1]);
            } else {
                $msg = get_title("active");
            }
            fwrite($msgsock, $msg, strlen($msg));
            continue;
        }	
	if (($command[0] == 'xover') || ($command[0] == 'over')) {
	    $msg = get_xover($command[1], $msgsock);
	    fwrite($msgsock, $msg, strlen($msg));
	    continue;
	}
	if (($command[0] == 'xhdr') || ($command[0] == 'hdr')) {
            $msg = get_xhdr($command[1], $command[2]);
            fwrite($msgsock, $msg, strlen($msg));
            continue;
        }
	if ($command[0] == 'help') {
	    $msg = "100 Sorry, can't help\r\n";
	    fwrite($msgsock, $msg, strlen($msg));
            continue;
        }
	if ($command[0] == 'quit') {
	    $msg = "205 closing connection - goodbye!\r\n";
	    fwrite($msgsock, $msg, strlen($msg));
	    socket_close($msgsock);
            exit(0);
        }
        file_put_contents($logfile, "\n".format_log_date()." Syntax error: ".$buf, FILE_APPEND);
        $talkback = "500 Syntax error or unknown command\r\n";
        fwrite($msgsock, $talkback, strlen($talkback));
      } while (true);    
      exit(0);   
    }

    /**
      * Become a daemon by forking and closing the parent
      */
    function become_daemon()
    {
        $pid = pcntl_fork();
       
        if ($pid == -1)
        {
            /* fork failed */
            echo "fork failure!\n";
            exit();
        }elseif ($pid)
        {
            /* close the parent */
            exit();
        }else
        {
            /* child becomes our daemon */
            posix_setsid();
            chdir('/');
            umask(0);
            return posix_getpid();

        }
    }

function prepare_post($filename) {
    global $logdir;
    $logfile = $logdir.'/nntp.log';
    $message = file($filename, FILE_IGNORE_NEW_LINES);
    $lines = 0;
    $is_header = 1;
    foreach($message as $line) {
      if(trim($line) == "" || $lines > 0) {
        $is_header=0;
        $lines++;
      }
      if($lines > 0 && $is_header = 0) {
        $break;
      }
      if(stripos($line, "Newsgroups: ") === 0) {
        $ngroups=explode(': ', $line);
        $newsgroups=$ngroups[1];
      }
    }
    $ngroups = preg_split("/(\ |\,)/", trim($newsgroups));
// DEBUG
    file_put_contents($logfile, "\n".format_log_date(). " DEBUG process_post: ".$newsgroups. " ".$ngroups[0], FILE_APPEND);
    $ok = 0;
    foreach($ngroups as $group) {
      $result = process_post($message, $group);
      if (substr($result,0,3) == "240") {
        $ok = 1;
      }
    }
    if($ok == 1) {
      $response="240 Article received OK\r\n";
    } else {
      $response="441 Posting failed\r\n";
    }
    return $response;
}

function process_post($message, $group) {
    global $logfile,$spooldir,$config_dir,$CONFIG,$nntp_group;
//    $message = file($filename, FILE_IGNORE_NEW_LINES);
    $no_mid=1;
    $no_date=1;
    $no_org=1;
    $is_header=1;
    $body="";
    $ref=0;
    $response="";
    $bytes=0;
    $lines=0;
/* Process post */
    foreach($message as $line) {
	$bytes = $bytes + mb_strlen($line, '8bit');
	if(trim($line) == "" || $lines > 0) {
          $is_header=0;
	  $lines++;
        }
        if($is_header == 0) {
          $body.=$line."\n";
        } else {
	  if(stripos($line, "Date: ") === 0) {
            $finddate=explode(': ', $line);
            $article_date = strtotime($finddate[1]);
	    $no_date=0;
          }
	  if(stripos($line, "Organization: ") !== false) {
	    $no_org=0;
          }
	  if(stripos($line, "Subject: ") !== false) {
            $subject=explode('Subject: ', $line, 2);
	    $ref=0;
          }
	  if(stripos($line, "From: ") === 0) {
            $from=explode(': ', $line);
	    $ref=0;
          }
          if(stripos($line, "Xref: ") === 0) {
            $xref=$line;
            $ref=0;
          }
	  if(stripos($line, "Newsgroups: ") === 0) {
            $ngroups=explode(': ', $line);
	    $newsgroups=$ngroups[1];
	    $ref=0;
          }
	  if(stripos($line, "References: ") === 0) {
            $references_line=explode(': ', $line);
	    $references=$references_line[1];
	    $ref=1;
          }
          if((stripos($line, ':') === false) && (strpos($line, '>'))) {
            if($ref == 1) {
              $references=$references." ".trim($line);
            }
          }
	  if(stripos($line, "Message-ID: ") !== false) {
            $mid=explode(': ', $line);
	    $no_mid=0;
          }
	}
    }
  rewind($message);
/*
 * SPAM CHECK
 */         
  if (isset($CONFIG['spamassassin']) && ($CONFIG['spamassassin'] == true)) {
          $spam_result_array = check_spam($subject[1],$from[1],$newsgroups,$references,$body,$msgid);
          $res = $spam_result_array['res'];
          $spamresult = $spam_result_array['spamresult'];
          $spamcheckerversion = $spam_result_array['spamcheckerversion'];
          $spamlevel = $spam_result_array['spamlevel'];
  }
  if($res === 1) {
    $orig_newsgroups = $newsgroups;
    $newsgroups=$CONFIG['spamgroup'];
    $group = $newsgroups;
  }
/* Find section for posting */
    $menulist = file($config_dir."menu.conf", FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
    foreach($menulist as $menu) {
      if($menu[0] == '#') {
        continue;
      }
      $menuitem=explode(':', $menu);
      $glfp=fopen($config_dir.$menuitem[0]."/groups.txt", 'r');
      $section="";
      while($gl=fgets($glfp)) {
	$group_name = preg_split("/( |\t)/", $gl, 2);
	if(strcasecmp($group, trim($group_name[0])) == 0) {
          $section=$menuitem[0];
	  break 2;
        }
      } 
    }
    fclose($glfp);
    @mkdir($spooldir."/".$section."/outgoing",0755,'recursive');
    $postfilename = tempnam($spooldir.'/'.$section.'/outgoing', '');
    $postfilehandle = fopen($postfilename, 'wb');
    if($no_date == 1) {
      $article_date=time();
      $date_rep = date('D, j M Y H:i:s O', $article_date); 
      fputs($postfilehandle, "Date: ".$date_rep."\r\n");
    } else {
      $date_rep = $finddate[1];
    }
    if($no_mid == 1) {
      $identity = $subject[1].",".$from[1].",".$ngroups[1].",".$references.",".$body;
      $msgid='<'.md5($identity).'$1@'.trim($CONFIG['email_tail'],'@').'>';
      fputs($postfilehandle, "Message-ID: ".$msgid."\r\n");
    } else {
      $msgid = $mid[1];
    }
    if($no_org == 1) {
      fputs($postfilehandle, "Organization: ".$CONFIG['organization']."\r\n");
    }
    if($res === 1) {
      if($orig_newsgroups !== $CONFIG['spamgroup']) {
        fputs($postfilehandle,"X-Rslight-Original-Group: ".$orig_newsgroups."\r\n");
      }
    }
    foreach($message as $line) {
      if(stripos($line, "Newsgroups: ") === 0) {
	fputs($postfilehandle, "Newsgroups: ".$newsgroups."\r\n");
      } else {
	fputs($postfilehandle, $line."\r\n");
      }
    }
    fclose($postfilehandle);
    unlink($filename);
    if($section == "") {
      $response="441 Posting failed (group not found)\r\n";
    } else {
      if($response == "") {
//        $post_group=explode(' ', str_replace(',', ' ', $newsgroups));
        
//        foreach($post_group as $onegroup) {
// Check for duplicate msgid
           $duplicate=0;
           $group_overviewfp=fopen($spooldir."/".$group."-overview", 'r');
           while($group_overview=fgets($group_overviewfp, 2048)) {
             $overview_msgid = explode("\t", $group_overview);
             if(strpos($overview_msgid[4], $msgid) !== false) {
	       unlink($postfilename);
               file_put_contents($logfile, "\n".format_log_date()." ".$section." Duplicate Message-ID for: ".$msgid, FILE_APPEND);
	       $duplicate=1;
	       break;
             } 
	   }
	   fclose($group_overviewfp);
//      }
      if($duplicate == 0) {
	insert_article($section,$group,$postfilename,$subject[1],$from[1],$article_date,$date_rep,$msgid,$references,$bytes,$lines,$xref,$body);	
        $response="240 Article received OK\r\n";
      } else {
	$response="441 Posting failed\r\n";
      }
     }
    }
    return $response;
}

function get_next($nntp_group) {
  global $spooldir,$nntp_article;
  if($nntp_group == "") {
    $response = "412 Not in a newsgroup\r\n";
    return $response;
  }
  $ok_article = get_article_list($nntp_group);
  sort($ok_article);
  $last = $ok_article[key(array_slice($ok_article, -1, 1, true))];
  if(($nntp_article + 1) > $last) { 
    $response = "421 No next article to retrieve\r\n";
  } else {
    $nntp_article++;
      $database = $spooldir.'/articles-overview.db3';
      $table = 'overview';
      $dbh = rslight_db_open($database, $table);
      $stmt = $dbh->prepare("SELECT * FROM $table WHERE newsgroup=:newsgroup AND number=:number");
      $stmt->bindParam(':newsgroup', $nntp_group);
      $stmt->bindParam(':number', $nntp_article);
      $stmt->execute();
      while($found = $stmt->fetch()) {
        $msgid = $found['msgid'];
        break;
      }
      $dbh = null;
    $response = "223 ".$nntp_article." ".$msgid." Article retrieved; request text separately\r\n"; 
  }
  return $response;
}

function get_last($nntp_group) {
  global $spooldir,$nntp_article;
  if($nntp_group == "") {
    $response = "412 Not in a newsgroup\r\n";
    return $response;
  }
  $ok_article = get_article_list($nntp_group);
  rsort($ok_article);
  $first = $ok_article[key(array_slice($ok_article, -1, 1, true))];
  if(($nntp_article - 1) < $first || !isset($nntp_article)) {
    $response = "422 No previous article to retrieve\r\n";
  } else {
    $nntp_article--;
      $database = $spooldir.'/articles-overview.db3';
      $table = 'overview';
      $dbh = rslight_db_open($database, $table);
      $stmt = $dbh->prepare("SELECT * FROM $table WHERE newsgroup=:newsgroup AND number=:number");
      $stmt->bindParam(':newsgroup', $nntp_group);
      $stmt->bindParam(':number', $nntp_article);
      $stmt->execute();
      while($found = $stmt->fetch()) {
        $msgid = $found['msgid'];
        break;
      }
      $dbh = null;
    $response = "223 ".$nntp_article." ".$msgid." Article retrieved; request text separately\r\n";
  }
  return $response;
}

function get_xhdr($header, $articles) {
    global $config_dir,$spooldir,$nntp_group,$nntp_article,$workpath,$path;
    $tmpgroup=$nntp_group;
    $mid=false;
// Use article pointer
    if(!isset($articles) && is_numeric($nntp_article)) {
      $articles = $nntp_article;
    }    
// By Message-ID
    if(!is_numeric($articles)) {
      $found = find_article_by_msgid($articles);
      $tmpgroup = $found['newsgroup'];
      $articles = $found['number'];
      if($tmpgroup == '') {
        $msg="430 No article with that message-id\r\n";
        return $msg;
      }
    }
    if(!isset($tmpgroup)) {
        $msg="412 no newsgroup selected\r\n";
        return $msg;
    }
    $thisgroup = $path."/".preg_replace('/\./', '/', $tmpgroup);
    $article_num = explode('-', $articles);
    $first = $article_num[0];
    if(isset($article_num[1]) && is_numeric($article_num[1])) {
      $last = $article_num[1];
    } else {
      if(strpos($articles, "-")) {
	$ok_article = get_article_list($nntp_group);
        fclose($group_overviewfp);
        sort($ok_article);
        $last = $ok_article[key(array_slice($ok_article, -1, 1, true))];
        if(!is_numeric($last))
          $last = 0;
      } else {
        $last = $first;
      }
    }
    $msg="221 Header information for ".$header." follows (from articles)\r\n";
    for($i=$first; $i<=$last; $i++) {
      $article_full_path=$thisgroup.'/'.strval($i);
      $data=extract_header_line($article_full_path, $header, $tmpgroup, $i);
      if($data !== false) {
        if($mid !== false) {
          $msg.=$mid." ".$data;
        } else {
           $msg.=strval($i)." ".$data;
        }
      }
    }
    $msg.=".\r\n";
    return $msg;
}

function extract_header_line($article_full_path, $header, $thisgroup, $article) {
  global $CONFIG;
  if($CONFIG['article_database'] == '1') {
    $thisarticle=np_get_db_article($article, $thisgroup);
  } else {
    $thisarticle=file($article_full_path, FILE_IGNORE_NEW_LINES);
  }
  foreach($thisarticle as $thisline) {
    if($thisline == "") {
      $msg2.=".\r\n";
      break;
    }
    if(stripos($thisline, $header) === 0) {
        $content=preg_split("/$header: /i", $thisline);
        return($content[1]."\r\n");
    }
  }
  return(false);
}

function get_title($mode) {
    global $nntp_group,$workpath,$spooldir,$path;
    $mode = strtolower($mode);
    if($mode == "active") {
	$msg="481 descriptions unavailable\r\n";
        return $msg;
    }
    if(!file_exists($spooldir."/".$mode."-title")) {
        $msg="481 descriptions unavailable\r\n";
        return $msg;
    }
    $title = file_get_contents($spooldir."/".$mode."-title", IGNORE_NEW_LINES);
    $msg="282 list of group and description follows\r\n";
    $msg.=$title;

    $msg.=".\r\n";
    return $msg;
}

function get_xover($articles, $msgsock) {
    global $nntp_group,$nntp_article,$workpath,$path;
// Use article pointer
    if(!isset($articles) && is_numeric($nntp_article)) {
      $articles = $nntp_article;
    }
// By Message-ID
    if(strpos($articles, "@") !== false) {
      $found = find_article_by_msgid($articles);
      $nntp_group = $found['newsgroup'];
      $first = $found['number'];
      $last = $first;
      $this_id = $found['msgid'];
      $articles = $found['number'];
      if(!isset($articles)) {
        $output="430 No article with that message-id\r\n";
        return $output;
      }
      $output="224 Overview information follows for ".$this_id."\r\n";
    }
    if($nntp_group == '') {
        $msg="412 no newsgroup selected\r\n";
        return $msg;
    }
    if(!isset($articles)) {
	$msg="420 no article(s) selected\r\n";
	return $msg;
    }
    $overviewfile=$workpath.$nntp_group."-overview";
  if(!isset($this_id)) {
    $article_num = explode('-', $articles);
    $first = $article_num[0];
    if(isset($article_num[1]) && is_numeric($article_num[1])) {
        $last = $article_num[1];
        $output="224 Overview information follows for articles ".$first." through ".$last."\r\n";
    } else {
      if(strpos($articles, "-")) {
        $ok_article = get_article_list($nntp_group);
        sort($ok_article);
        $last = $ok_article[key(array_slice($ok_article, -1, 1, true))];
        if(!is_numeric($last)) {
            $last = 0;
        }
        $output="224 Overview information follows for articles ".$first." through ".$last."\r\n";    
      } else {
        $last = $first;
        $output="224 Overview information follows for ".$first."\r\n";
      }
   }
  }
    fwrite($msgsock, $output, strlen($output));
    $overviewfp=fopen($overviewfile, 'r');
    while($overviewline=fgets($overviewfp)) {
      $article=preg_split("/[\s,]+/", $overviewline);
      for($i=$first; $i<=$last; $i++) {
        if($article[0] === strval($i)) {
	  $overviewline = trim($overviewline)."\r\n";
          fwrite($msgsock, $overviewline, strlen($overviewline));
        }
      }
    }
    fclose($overviewfp); 
    $msg.=".\r\n";
    return $msg;
}

function get_stat($article) {
    global $nntp_group,$nntp_article,$workpath,$path;
    if($nntp_group == '') {
        $msg="412 Not in a newsgroup\r\n";
        return $msg;
    }
// Use article pointer
    if(!isset($article) && is_numeric($nntp_article)) {
      $article = $nntp_article;
    }
    if(!is_numeric($article)) {
	$msg="423 No article number selected\r\n";
	return $msg;
    }
    $overviewfile=$workpath.$nntp_group."-overview";
    $overviewfp=fopen($overviewfile, 'r');
    while($overviewline=fgets($overviewfp)) {
      $over=explode("\t", $overviewline);
      if(trim($over[0]) == trim($article)) { 
	$msg="223 ".$article." ".$over[4]." status\r\n";
	fclose(overviewfp);
	return $msg;
      }
    }
    fclose($overviewfp);
    $msg="423 No such article number ".$article."\r\n";
    return $msg;
}

function get_article($article, $nntp_group) {
    global $CONFIG,$config_dir,$path,$groupconfig,$config_name,$spooldir,$nntp_article;
    $msg2="";
// Use article pointer
    if(!isset($article) && is_numeric($nntp_article)) {
      $article = $nntp_article;
    }
// By Message-ID
    if(!is_numeric($article)) {
      $found = find_article_by_msgid($article);
      $nntp_group = $found['newsgroup'];
      $article = $found['number'];
      $this_id = $found['msgid'];
    } else {
// By article number
      if($nntp_group === "") {
        $msg.="412 no newsgroup has been selected\r\n";
        return $msg;
      }
      if(!is_numeric($article)) {
        $msg.="420 no article has been selected\r\n";
        return $msg;
      }
    } 
  if($CONFIG['article_database'] == '1') {
      $thisarticle=np_get_db_article($article, $nntp_group);
      if($thisarticle === FALSE) {
	$msg.="430 no such article found\r\n";
        return $msg;
      }
      $thisarticle[] = ".";
  } else {
    $thisgroup = $path."/".preg_replace('/\./', '/', $nntp_group);
    if(!file_exists($thisgroup."/".$article)) {
        $msg.="430 no such article found\r\n";
        return $msg;
    }
    $thisarticle=file($thisgroup."/".$article, FILE_IGNORE_NEW_LINES);
  }
  foreach($thisarticle as $thisline) {
        if((strpos($thisline, "Message-ID: ") === 0) && !isset($mid[1])) {
          $mid=explode(': ', $thisline);
        }
	$msg2.=$thisline."\r\n";
    }
    $msg="220 ".$article." ".$mid[1]." article retrieved - head and body follow\r\n";
    $nntp_article = $article;
    return $msg.$msg2;
}

function get_header($article, $nntp_group) {
    global $CONFIG,$nntp_article,$config_dir,$path,$groupconfig,$config_name,$spooldir;
    $msg2="";
// Use article pointer
    if(!isset($article) && is_numeric($nntp_article)) {
      $article = $nntp_article;
    }
// By Message-ID
    if(!is_numeric($article)) {
      $found = find_article_by_msgid($article);
      $nntp_group = $found['newsgroup'];
      $article = $found['number'];
      $this_id = $found['msgid'];
    } else {
// By article number
      if($nntp_group === "") {
        $msg.="412 no newsgroup has been selected\r\n";
        return $msg;
      }
      if(!is_numeric($article)) {
        $msg.="420 no article has been selected\r\n";
        return $msg;
      }
    }
  if($CONFIG['article_database'] == '1') {
      $thisarticle=np_get_db_article($article, $nntp_group);
      if($thisarticle === FALSE) {
        $msg.="430 no such article found\r\n";
        return $msg;
      }
 } else {
    $thisgroup = $path."/".preg_replace('/\./', '/', $nntp_group);
    if(!file_exists($thisgroup."/".$article)) {
        $msg.="430 no such article found\r\n";
        return $msg;
    }
    $thisarticle=file($thisgroup."/".$article, FILE_IGNORE_NEW_LINES);
  }
     foreach($thisarticle as $thisline) {
	if($thisline == "") {
	  $msg2.=".\r\n";
	  break;
	}
        if((strpos($thisline, "Message-ID: ") === 0) && !isset($mid[1])) {
            $mid=explode(': ', $thisline);
        }
        $msg2.=$thisline."\r\n";
    }
    $msg="221 ".$article." ".$mid[1]." article retrieved - header follows\r\n";
    return $msg.$msg2;
}

function get_body($article, $nntp_group) {
    global $CONFIG,$nntp_article,$config_dir,$path,$groupconfig,$config_name,$spooldir;
    $msg2="";
// Use article pointer
    if(!isset($article) && is_numeric($nntp_article)) {
      $article = $nntp_article;
    }
// By Message-ID
    if(!is_numeric($article)) {
      $found = find_article_by_msgid($article);
      $nntp_group = $found['newsgroup'];
      $article = $found['number'];
      $this_id = $found['msgid'];
    } else {
// By article number
      if($nntp_group === "") {
        $msg.="412 no newsgroup has been selected\r\n";
        return $msg;
      }
      if(!is_numeric($article)) {
        $msg.="420 no article has been selected\r\n";
        return $msg;
      }
    }
  if($CONFIG['article_database'] == '1') {
      $thisarticle=np_get_db_article($article, $nntp_group);
      if($thisarticle === FALSE) {
        $msg.="430 no such article found\r\n";
        return $msg;
      }
      $thisarticle[] = ".";
 } else {
    $thisgroup = $path."/".preg_replace('/\./', '/', $nntp_group);
    if(!file_exists($thisgroup."/".$article)) {
        $msg.="430 no such article found\r\n";
        return $msg;
    }
    $thisarticle=file($thisgroup."/".$article, FILE_IGNORE_NEW_LINES);
  }
    foreach($thisarticle as $thisline) {
        if(($thisline == "") && ($body == 0)) {
	  $body=1;
          continue;
        }
        if((strpos($thisline, "Message-ID: ") === 0) && !isset($mid[1])) {
            $mid=explode(': ', $thisline);
        }
	if($body == 1) {
          $msg2.=$thisline."\r\n";
	}
    }
    $msg="222 ".$article." ".$mid[1]." article retrieved - body follows\r\n";
    return $msg.$msg2;
}

function get_listgroup($nntp_group, $msgsock) {
    global $spooldir,$path,$nntp_group,$groupconfig;
    $grouplist = file($groupconfig, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
    if($nntp_group == '') {
      $msg="412 no newsgroup selected\r\n";
      return $msg;
    }
    $ok_group=false;
    $count=0;
    foreach($grouplist as $findgroup) {
        $name = preg_split("/( |\t)/", $findgroup, 2);
        $name[0]=strtolower($name[0]);
        $nntp_group=strtolower($nntp_group);
        if(!strcmp($name[0], $nntp_group)) {
            $ok_group=true;
            break;
        }
    }
    $ok_article = get_article_list($nntp_group);
    fclose($group_overviewfp);
    $count = count($ok_article);
    sort($ok_article);
    $last = $ok_article[key(array_slice($ok_article, -1, 1, true))];
    $first = $ok_article[0];
    if(!is_numeric($last))
        $last = 0;
    if(!is_numeric($first))
        $first = 0;
    $output="211 ".$count." ".$first." ".$last." ".$nntp_group."\r\n";
    fwrite($msgsock, $output, strlen($output));
    foreach($ok_article as $art) {
	$output=$art."\r\n";
	fwrite($msgsock, $output, strlen($output));
    }
    $msg=".\r\n";
    return $msg;
}

function get_group($change_group) {
    global $spooldir,$path,$nntp_group,$nntp_article,$groupconfig;
    $grouplist = file($groupconfig, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
    $ok_group=false;
    $count=0;
    foreach($grouplist as $findgroup) {
	$name = preg_split("/( |\t)/", $findgroup, 2);
	$name[0]=strtolower($name[0]);
	$change_group=strtolower($change_group);
	if(!strcmp($name[0], $change_group)) {
	    $ok_group=true;
	    break;
	}
    }
    if($ok_group == false) {
      $response = "411 No such group ".$change_group."\r\n";
      return $response;
    }
    $nntp_group = $change_group;
    $ok_article = get_article_list($nntp_group);
    $count = count($ok_article);
    sort($ok_article);
    $last = $ok_article[key(array_slice($ok_article, -1, 1, true))];
    $first = $ok_article[0];
    if(!is_numeric($last))
        $last = 0;
    if(!is_numeric($first))
        $first = 0;
    $nntp_article = $first;
    $msg="211 ".$count." ".$first." ".$last." ".$nntp_group."\r\n";
    return $msg;    
}

function get_newgroups($mode) {
    global $path,$groupconfig;
    $grouplist = file($groupconfig, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
    $mode = strtolower($mode);
  $mode = "active";
  if($mode == "active") {
    $msg = '231 list of newsgroups follows'."\r\n";
    foreach($grouplist as $findgroup) {
	$name = preg_split("/( |\t)/", $findgroup, 2);
        if($name[0][0] === ':')
            continue;
	$ok_article = get_article_list($nntp_group);
        sort($ok_article);
        $last = $ok_article[key(array_slice($ok_article, -1, 1, true))];
        $first = $ok_article[0];
        if(!is_numeric($last))
            $last = 0;
        if(!is_numeric($first))
            $first = 0;
        $msg.=$name[0]." ".$last." ".$first." n\r\n";
    }
  }
  if($mode == "newsgroups") {
    $msg = '215 list of newsgroups and descriptions follows'."\r\n";
    foreach($grouplist as $findgroup) {
      if($findgroup[0] === ':')
        continue;
      $msg.=$findgroup."\r\n";
    }
  }
  if($mode == "overview.fmt") {
    $msg="215 Order of fields in overview database.\r\n";
    $msg.="Subject:\r\n";
    $msg.="From:\r\n";
    $msg.="Date:\r\n";
    $msg.="Message-ID:\r\n";
    $msg.="References:\r\n";
    $msg.="Bytes:\r\n";
    $msg.="Lines:\r\n";
    $msg.="Xref:full\r\n";
  }
  if(isset($msg)) {
    return $msg.".\r\n";
  } else {
    $msg="501 Syntax error or unknown command\r\n";
    return $msg.".\r\n";
  }
}

function get_list($mode, $msgsock) {
    global $path,$spooldir,$groupconfig;
    $grouplist = file($groupconfig, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
  $mode = strtolower($mode);
  if($mode == "headers") {
    $msg = "215 metadata items supported:\r\n";
    $msg.= ":\r\n";
    $msg.= ":lines\r\n";
    $msg.= ":bytes\r\n";
  }
  if($mode == "active") {  
    $msg = '215 list of newsgroups follows'."\r\n";
    fwrite($msgsock, $msg, strlen($msg));
    foreach($grouplist as $findgroup) {
	  $name = preg_split("/( |\t)/", $findgroup, 2);
	  if($name[0][0] === ':')
	    continue;
	  $ok_article = get_article_list($findgroup);
	  sort($ok_article);
	  $last = $ok_article[key(array_slice($ok_article, -1, 1, true))];
	  $first = $ok_article[0];
	  if(!is_numeric($last)) {
	    $last = 0;
	  }
	  if(!is_numeric($first)) {
	    $first = 0;
	  }
      $output=$name[0]." ".$last." ".$first." y\r\n";
      fwrite($msgsock, $output, strlen($output));
      }
    return ".\r\n";
  }
  if($mode == "newsgroups") {
    $msg = '215 list of newsgroups and descriptions follows'."\r\n";
    foreach($grouplist as $findgroup) {
      if($findgroup[0] === ':')
        continue;
      $name = preg_split("/( |\t)/", $findgroup, 2);
      if(trim($name[1]) !== "") {
        $msg.=$findgroup."\r\n";
      } elseif(file_exists($spooldir."/".$name[0]."-title")) {
        $msg.=file_get_contents($spooldir."/".$name[0]."-title", IGNORE_NEW_LINES);
      } else {
        $msg.=$findgroup."\r\n";
      }
    }
  }
  if($mode == "overview.fmt") {
    $msg="215 Order of fields in overview database.\r\n";
    $msg.="Subject:\r\n";
    $msg.="From:\r\n";
    $msg.="Date:\r\n";
    $msg.="Message-ID:\r\n";
    $msg.="References:\r\n";
    $msg.="Bytes:\r\n";
    $msg.="Lines:\r\n";
    $msg.="Xref:full\r\n";
  }
  if(isset($msg)) {
    return $msg.".\r\n";
  } else {
    $msg="501 Syntax error or unknown command\r\n";
    return $msg.".\r\n";
  }
}
/*
function encode_subject($line) {
        $newstring=mb_encode_mimeheader(quoted_printable_decode($line));
        return $newstring;
}
*/

function insert_article($section,$nntp_group,$filename,$subject_i,$from_i,$article_date,
$date_i,$mid_i,$references_i,$bytes_i,$lines_i,$xref_i,$body) {
  global $enable_rslight,$spooldir,$CONFIG,$logdir,$lockdir,$logfile;

 if($CONFIG['remote_server'] !== '') {
  $sn_lockfile = $lockdir . '/'.$section.'-spoolnews.lock';
  $sn_pid = file_get_contents($sn_lockfile);
  if (posix_getsid($sn_pid) === false || !is_file($sn_lockfile)) {
    file_put_contents($sn_lockfile, getmypid()); // create lockfile
  } else {
    file_put_contents($logfile, "\n".format_log_date()." ".$section." Queuing local post: ".$nntp_group, FILE_APPEND); 
    return(1);
  }
 }
  $local_groupfile=$spooldir."/".$section."/local_groups.txt";
  $path=$spooldir."/articles/";
  $grouppath = $path.preg_replace('/\./', '/', $nntp_group);
  if(!is_dir($grouppath)) {
    mkdir($grouppath, 0755, true);
  }
  $nocem_check="@@NCM";
  $article_date=strtotime($date_i); 
  # Check if group exists. Open it if it does
  fputs($ns, "group ".$nntp_group."\r\n");
  $response = line_read($ns);
  if (strcmp(substr($response,0,3),"411") == 0) {
    unlink($sn_lockfile);
    return(1);
  }
  $grouplist = file($local_groupfile, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
  foreach($grouplist as $findgroup) {
    $name = explode(':', $findgroup);
    if (strcmp($name[0], $nntp_group) == 0) {
      if (is_numeric($name[1]))
        $local = $name[1];
      else {
	$ok_article = get_article_list($nntp_group);
        sort($ok_article);
        $local = $ok_article[key(array_slice($ok_article, -1, 1, true))];
	if(!is_numeric($local))
          $local = 0;
	$local = $local + 1;
      }
      break;
    }
  }
  if($local < 1)
    $local = 1;
      if($article_date > time())
        $article_date = time();
      $in_file=fopen($filename, 'r');
      while(is_file($grouppath."/".$local)) {
        $local++;
      }
      $out_file=fopen($grouppath."/".$local, 'w+');
      $header=1;
      while($buf=fgets($in_file)) {
	if((trim($buf) == "") && ($header == 1)) {
	  $buf="Xref: ".$CONFIG['pathhost']." ".$nntp_group.":".$local;
	  fputs($out_file, rtrim($buf, "\n\r").PHP_EOL);
	  $xref_i=$buf;
	  $buf="";
	  $header=0;
	}
	fputs($out_file, rtrim($buf, "\n\r").PHP_EOL);
      }
      fputs($out_file, "\n.\n");
      fclose($out_file);
      fclose($in_file);
      touch($grouppath."/".$local, $article_date);
      file_put_contents($logfile, "\n".format_log_date()." ".$section." Inserting local post: ".$nntp_group.":".$local, FILE_APPEND);
// Overview
      $overviewHandle = fopen($spooldir."/".$nntp_group."-overview", 'a');
  # Prepare overview database
  $database = $spooldir.'/articles-overview.db3';
  $table = 'overview';
  $dbh = rslight_db_open($database, $table);
  if(!$dbh) {
    file_put_contents($logfile, "\n".format_log_date()." ".$section." Failed to connect to database: ".$database, FILE_APPEND);
  } else {
    file_put_contents($logfile, "\n".format_log_date()." ".$section." Connected to database: ".$database, FILE_APPEND);
    $sql = 'INSERT INTO '.$table.'(newsgroup, number, msgid, date, name, subject) VALUES(?,?,?,?,?,?)';
    $stmt = $dbh->prepare($sql);
    $stmt->execute([$nntp_group, $local, $mid_i, $article_date, $from_i, $subject_i]);
    $dbh = null;
  }
  if($CONFIG['article_database'] == '1') {
    foreach($body as $line) {
      if(trim($line) == "") {
	break;
      }
      if(stripos($line, "Content-Type: ") === 0) {
        preg_match('/.*charset=.*/', $line, $te);
        $content_type = explode("Content-Type: text/plain; charset=", $te[0]);
      }
    }
    if(isset($content_type[1])) {
	$this_snippet = get_search_snippet($body, $content_type[1]);
    } else {
        $this_snippet = get_search_snippet($body);
    }
    $article_dbh = article_db_open($spooldir.'/'.$nntp_group.'-articles.db3');
    $article_sql = 'INSERT INTO articles(newsgroup, number, msgid, date, name, subject, article, search_snippet) VALUES(?,?,?,?,?,?,?,?)';
    $article_stmt = $article_dbh->prepare($article_sql);
    $this_article = file_get_contents($grouppath."/".$local);
    $article_stmt->execute([$nntp_group, $local, $mid_i, $article_date, $from_i, $subject_i, trim($this_article), $this_snippet]);
    unlink($grouppath."/".$local);
    $article_dbh = null;
  }
      fputs($overviewHandle, $local."\t".$subject_i."\t".$from_i."\t".$date_i."\t".$mid_i."\t".$references_i."\t".$bytes_i."\t".$lines_i."\t".$xref_i."\n");
      fclose($overviewHandle);
      $references="";
// End Overview
  reset($grouplist);
  $saveconfig = fopen($local_groupfile, 'w+');
  $local++;
  foreach($grouplist as $savegroup) {
    $name = explode(':', $savegroup);
    if (strcmp($name[0], $nntp_group) == 0) {
      fwrite($saveconfig, $nntp_group.":".$local."\n");
    } else {
      fwrite($saveconfig, $savegroup."\n");
    }
  }
  fclose($saveconfig);
  unlink($sn_lockfile);
}

function find_article_by_msgid($msgid) {
  global $spooldir;
      $database = $spooldir.'/articles-overview.db3';
      $table = 'overview';
      $dbh = rslight_db_open($database, $table);
      $stmt = $dbh->prepare("SELECT * FROM $table WHERE msgid like :terms");
      $stmt->bindParam(':terms', $msgid);
      $stmt->execute();
      while($found = $stmt->fetch()) {
        $return['newsgroup'] = $found['newsgroup'];
        $return['number'] = $found['number'];
        $return['msgid'] = $found['msgid'];
        break;
      }
      $dbh = null;
  return $return;
}

function get_article_list($thisgroup) {
  global $spooldir;
  $database = $spooldir."/articles-overview.db3";
  $table = 'overview';
  $dbh = rslight_db_open($database, $table);
  $stmt = $dbh->prepare("SELECT * FROM $table WHERE newsgroup=:thisgroup ORDER BY number");
  $stmt->execute(['thisgroup' => $thisgroup]);
  $ok_article=array();
  while($found = $stmt->fetch()) {
    $ok_article[] = $found['number'];
  }
  $dbh = null;
  return(array_unique($ok_article));
}

function create_node_ssl_cert($pemfile) {
    global $CONFIG, $ssldir, $webtmp, $config_dir;
    include $config_dir.'/letsencrypt.inc.php';
    $uinfo=posix_getpwnam($CONFIG['webserver_user']);
    $pubkeyfile = $ssldir.'/pubkey.pem';
    $pubkeytxtfile = $webtmp.'/pubkey.txt';
	$ssltime = filectime($letsencrypt['path'])."fullchain.pem";
    if(isset($letsencrypt['path'])) {
        if($ssltime > filectime($pemfile)) {
            touch($config_dir.'/ssl.reload');
        }
        
    }
    if(!file_exists($config_dir.'/ssl.reload')) {
      if((is_file($pemfile)) && (is_file($pubkeyfile)) && (is_file($pubkeytxtfile))) {
          if(md5_file($pubkeyfile) == md5_file($pubkeytxtfile)) {
            return;
          }
      }
    }
    @unlink($config_dir.'/ssl.reload');
    unlink($pemfile);
    unlink($pubkeyfile);
    unlink($pubkeytxtfile);
/* Use letsencrypt */    
    if((isset($letsencrypt['server.pem'])) && (isset($letsencrypt['pubkey.pem']))) {
        file_put_contents($pemfile, $letsencrypt['server.pem'].$letsencrypt['privkey']);
        file_put_contents($pubkeyfile, $letsencrypt['pubkey.pem']);
        file_put_contents($pubkeytxtfile, $letsencrypt['pubkey.pem']);
        touch($pemfile, $ssltime);  
		touch($pubkeyfile, $ssltime);
		touch($pubkeytxtfile, $ssltime);
    } else {
/* Create self signed cert */
      $certificateData = array(
        "countryName" => "US",
        "stateOrProvinceName" => "New York",
        "localityName" => "New York City",
        "organizationName" => "Rocksolid",
        "organizationalUnitName" => "Rocksolid Light",
        "commonName" => $CONFIG['organization'],
        "emailAddress" => "rocksolid@example.com"
      );
    
    // Generate certificate
      $privateKey = openssl_pkey_new();
      $certificate = openssl_csr_new($certificateData, $privateKey);
      $certificate = openssl_csr_sign($certificate, null, $privateKey, 365);
    
      // Generate PEM file
      $pem_passphrase = null; // empty for no passphrase
      $pem = array();
      openssl_x509_export($certificate, $pem[0]);
      openssl_pkey_export($privateKey, $pem[1], $pem_passphrase);
      $pem = implode($pem);
      $pubkey=openssl_pkey_get_details($privateKey);
    
      // Save PEM file
      file_put_contents($pemfile, $pem);
      file_put_contents($pubkeyfile, $pubkey['key']);
      file_put_contents($pubkeytxtfile, $pubkey['key']);
    }
    chown($pemfile, $uinfo["uid"]);
    chown($pubkeyfile, $uinfo["uid"]);
    chown($pubkeytxtfile, $uinfo["uid"]);
    chmod($pemfile,0660);
    chmod($pubkeyfile,0660);
    chmod($pubkeytxtfile,0660);
}
?>