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#include <module.h> 
inherit "module"; 
inherit "roxenlib"; 
 
// Experimental Perl script and tag handler module. 
// by Leif Stensson. 
 
string cvs_version = 
       "$Id: perl.pike,v 2.9 2000/09/19 23:03:16 kuntri Exp $"; 
 
constant module_type = MODULE_EXPERIMENTAL | 
            MODULE_FILE_EXTENSION | MODULE_TAG; 
 
constant module_name = "Perl support"; 
constant module_doc = 
   "EXPERIMENTAL MODULE! This module provides a faster way of running " 
   "Perl scripts with Roxen. " 
   "The module also optionally provides a &lt;perl&gt;..&lt;/perl&gt; " 
   "container to run Perl code from inside RXML pages.";  
 
static string recent_error = 0; 
static int parsed_tags = 0, script_calls = 0, script_errors = 0; 
 
static mapping handler_settings = ([ ]); 
 
constant thread_safe = 1; 
 
#ifdef THREADS 
static object mutex = Thread.Mutex(); 
#endif 
 
void create() 
{ 
  defvar("extensions", ({ "pl", "perl" }), "Extensions", TYPE_STRING_LIST, 
    "List of URL extensions that should be taken to indicate that the " 
    "document is a Perl script."); 
 
#if 0 
  defvar("libdir", "./perl", "Roxen Perl Directory", TYPE_DIR, 
    "This is the name of a directory with Roxen-related Perl stuff. It " 
    "should normally point to `perl' in the Roxen server directory, " 
    "but you may want to point it elsewhere if you want to modify the " 
    "code."); 
#endif 
 
  defvar("showbacktrace", 0, "Show Backtraces", TYPE_FLAG, 
    "This setting decides whether to deliver a backtrace in the document " 
    "if an error is caught while a script runs."); 
 
  defvar("tagenable", 0, "Enable Perl Tag", TYPE_FLAG, 
    "This setting decides whether to enable parsing of Perl code in " 
    "RXML pages, in &lt;perl&gt;..&lt;/perl&gt; containers."); 
 
  defvar("scriptout", "HTML", "Script output", TYPE_MULTIPLE_STRING, 
    "How to treat script output. HTML means treat it as a plain HTML " 
    "document. RXML is similar, but passes it through the RXML parser " 
    "before returning it to the client. HTTP is the traditional CGI " 
    "output style, where the script is responsible for producing the " 
    "HTTP headers before the document, as well as the main document " 
    "data.", 
         ({ "HTML", "RXML", "HTTP" }) 
        ); 
 
  defvar("rxmltag", 0, "RXML-parse tag results", TYPE_FLAG, 
    "Allow RXML parsing of tag results."); 
 
  defvar("bindir", "perl/bin", "Perl Helper Binaries", TYPE_DIR, 
    "Perl helper binaries directory."); 
 
  defvar("parallel", 2, "Parallel scripts", TYPE_MULTIPLE_INT, 
    "Number of scripts/tags that may be evaluated in parallel. Don't set " 
    "this higher than necessary, since it may cause the server to block. " 
    "The default for this setting is 2.", 
         ({ 1, 2, 3, 4, 5 }) ); 
 
#if constant(getpwnam) 
  defvar("identity", "nobody:*", "Run Perl as...", TYPE_STRING, 
    "User and group to run Perl scripts and tags as. The default for " 
    "this option is `nobody:*'. Note that Roxen can't change user ID " 
    "unless it has sufficient permissions to do so. `*' means `use " 
    "same as Roxen'."); 
#endif 
} 
 
string status() 
{ string s = "<b>Script calls</b>: " + script_calls + " <br />\n" + 
             "<b>Script errors</b>: " + script_errors + " <br />\n" + 
             "<b>Parsed tags</b>: "  + parsed_tags + " <br />\n"; 
 
#if constant(getpwnam) 
  if (handler_settings->set_uid) 
        s += sprintf("<b>Subprocess UID</b>: set uid=%O <br />\n", 
                     handler_settings->set_uid); 
  else 
        s += "<b>Subprocess UID</b>: same as Roxen<br />\n"; 
#endif 
 
  s += "<b>Helper script</b>: "; 
  if (Stdio.File(QUERY(bindir)+"/perlrun", "r")) 
       s += "found: " + QUERY(bindir)+"/perlrun <br />\n"; 
  else 
       s += "not found.<br />\n"; 
 
  if (recent_error) 
       s += "<b>Most recent error</b>: " + recent_error + " <br />\n"; 
 
  return s; 
} 
 
static object gethandler() 
{ return ExtScript.getscripthandler(QUERY(bindir)+"/perlrun", 
                                    QUERY(parallel), handler_settings); 
} 
 
static void fix_settings() 
{ 
  string u, g; 
  mapping s = ([ ]); 
 
#if constant(getpwnam) 
  if (sscanf(QUERY(identity), "%s:%s", u, g) == 2) 
  { 
    array ua = getpwnam(u), ga = getgrnam(g); 
 
    if (!ua) ua = getpwuid((int) u); 
    if (!ga) ga = getgrgid((int) g); 
 
    if (ua) s->set_uid = ua[2]; 
    if (ga) s->set_gid = ga[2]; 
  } 
#endif 
 
  handler_settings = s; 
} 
 
static void periodic() 
{ 
  fix_settings(); 
  ExtScript.periodic_cleanup(); 
  call_out(periodic, 900); 
} 
 
void start() 
{ fix_settings(); 
  call_out(periodic, 900); 
} 
 
mixed handle_file_extension(Stdio.File file, string ext, object id) 
{ object h = gethandler(); 
 
  if (id->realfile && stringp(id->realfile)) 
  { array result; 
 
    NOCACHE(); 
 
    if (!h) return http_string_answer("<h1>Script support failed.</h1>"); 
 
    mixed bt = catch (result = h->run(id->realfile, id)); 
 
    ++script_calls; 
 
    if (bt) 
    { ++script_errors; 
      report_error("Perl script `" + id->realfile + "' failed.\n"); 
      if (QUERY(showbacktrace)) 
        return http_string_answer("<h1>Script Error!</h1>\n<pre>" + 
                       describe_backtrace(bt) + "\n</pre>"); 
      else 
        return http_string_answer("<h1>Script Error!</h1>"); 
    } 
    else if (sizeof(result) > 1) 
    { string r = result[1]; 
//      werror("Result: " + sprintf("%O", r) + "\n"); 
      if (r == "") r = " "; // Some browsers don't like null answers. 
      if (!stringp(r)) r = "(not a string)"; 
      switch (QUERY(scriptout)) 
      { case "RXML": 
          return http_rxml_answer(r, id); 
        case "HTML": 
          return http_string_answer(r); 
        case "HTTP": 
          id->connection()->write("HTTP/1.0 200 OK\r\n"); 
          id->connection()->write(r); 
          id->connection()->close(); 
          return http_pipe_in_progress(); 
        default: 
          return http_string_answer("SCRIPT ERROR: " 
                                    "bad output mode configured.\n"); 
      } 
    } 
    else 
    { return http_string_answer(sprintf("RESULT: %O", result)); 
    } 
  } 
 
  return http_string_answer("FOO!"); 
 
  return 0; 
} 
 
constant simpletag_perl_flags = 0; 
 
mixed simpletag_perl(string tag, mapping attr, string contents, object id, 
                     RXML.Frame frame) 
{ 
  if (!QUERY(tagenable)) 
       RXML.run_error("<perl>...</perl> tag not enabled in this server."); 
 
  object h = gethandler(); 
 
  if (!h) 
        RXML.run_error("Perl tag support unavailable."); 
 
  NOCACHE(); 
 
  array result; 
  mixed bt = catch (result = h->eval(contents, id)); 
  ++parsed_tags; 
 
  if (bt) 
  { 
    werror("Perl tag backtrace:\n" + describe_backtrace(bt) + "\n"); 
    RXML.run_error("Perl tag"); 
  } 
  else if (sizeof(result) > 1) 
  { if (result[0] < 0 || !stringp(result[1])) 
      return "SCRIPT ERROR: " + sprintf("%O", result[1]); 
    else if (QUERY(rxmltag)) 
    { 
      frame->result_type = frame->result_type(RXML.PXml); 
      return parse_rxml(result[1], id); 
    } 
    else 
      return result[1]; 
  } 
  else 
    return sprintf("SCRIPT ERROR: bad result: %O", result); 
 
  return "<b>(No perl tag support?)</b>"; 
} 
 
mixed simple_pi_tag_perl(string tag, mapping attr, string contents, object id, 
                     RXML.Frame frame) 
{ 
  return simpletag_perl(tag, attr, contents, id, frame); 
} 
 
array(string) query_file_extensions() 
{ 
  return QUERY(extensions); 
} 
 
TAGDOCUMENTATION; 
#ifdef manual 
constant tagdoc=([ 
"<?perl":#"<desc pi><short hide> 
 Perl processing instruction tag.</short>This processing intruction 
 tag allows for evaluating Pike code directly in the document.</p> 
 
 <p>Note: Read the installation and configuration documentation in the 
 Administration manual to set up the Perl support properly. If the 
 correct parameters are not set the Perl code might not work properly 
 or security issues might arise.</p> 
 
 <p>There is also a <ref 
 type=tag><tag>perl</tag></ref>...<tag>/perl</tag> container tag 
 available.</p> 
</desc>", 
 
  ]); 
#endif