perl.c

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/*
 * purple
 *
 * Copyright (C) 2003 Christian Hammond <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#ifdef HAVE_CONFIG_H
#include <config.h>
# ifdef HAVE_LIMITS_H
#  include <limits.h>
#  ifndef NAME_MAX
#   define NAME_MAX _POSIX_NAME_MAX
#  endif
# endif
#endif

#ifdef DEBUG
# undef DEBUG
#endif

#undef PACKAGE

#define group perl_group

#ifdef _WIN32
/* This took me an age to figure out.. without this __declspec(dllimport)
 * will be ignored.
 */
# define HASATTRIBUTE
#endif

#include <EXTERN.h>

#ifndef _SEM_SEMUN_UNDEFINED
# define HAS_UNION_SEMUN
#endif

#include <perl.h>
#include <XSUB.h>

#ifndef _WIN32
# include <sys/mman.h>
#endif

#undef PACKAGE

#ifndef _WIN32
# include <dirent.h>
#else
 /* We're using perl's win32 port of this */
# define dirent direct
#endif

#undef group

/* perl module support */
#ifdef OLD_PERL
extern void boot_DynaLoader _((CV * cv));
#else
extern void boot_DynaLoader _((pTHX_ CV * cv)); /* perl is so wacky */
#endif

#undef _
#ifdef DEBUG
# undef DEBUG
#endif
#ifdef _WIN32
# undef pipe
#endif

#ifdef _WIN32
#define _WIN32DEP_H_
#endif
#include "internal.h"
#include "debug.h"
#include "plugin.h"
#include "signals.h"
#include "version.h"

#include "perl-common.h"
#include "perl-handlers.h"

#include <gmodule.h>

#define PERL_PLUGIN_ID "core-perl"

PerlInterpreter *my_perl = NULL;

static PurplePluginUiInfo ui_info =
{
	purple_perl_get_plugin_frame,
	0,   /* page_num (Reserved) */
	NULL, /* frame (Reserved)    */
	/* Padding */
	NULL,
	NULL,
	NULL,
	NULL
};

#ifdef PURPLE_GTKPERL
static PurpleGtkPluginUiInfo gtk_ui_info =
{
	purple_perl_gtk_get_plugin_frame,
	0 /* page_num (Reserved) */
};
#endif

static void
#ifdef OLD_PERL
xs_init()
#else
xs_init(pTHX)
#endif
{
	char *file = __FILE__;

	/* This one allows dynamic loading of perl modules in perl scripts by
	 * the 'use perlmod;' construction */
	newXS("DynaLoader::boot_DynaLoader", boot_DynaLoader, file);
}

static void
perl_init(void)
{
	/* changed the name of the variable from load_file to perl_definitions
	 * since now it does much more than defining the load_file sub.
	 * Moreover, deplaced the initialisation to the xs_init function.
	 * (TheHobbit) */
	char *perl_args[] = { "", "-e", "0", "-w" };
	char perl_definitions[] =
	{
		/* We use to function one to load a file the other to execute
		 * the string obtained from the first and holding the file
		 * contents. This allows to have a really local $/ without
		 * introducing temp variables to hold the old value. Just a
		 * question of style:) */
		"package Purple::PerlLoader;"
		"use Symbol;"

		"sub load_file {"
		  "my $f_name=shift;"
		  "local $/=undef;"
		  "open FH,$f_name or return \"__FAILED__\";"
		  "$_=<FH>;"
		  "close FH;"
		  "return $_;"
		"}"

		"sub destroy_package {"
		  "eval { $_[0]->UNLOAD() if $_[0]->can('UNLOAD'); };"
		  "Symbol::delete_package($_[0]);"
		"}"

		"sub load_n_eval {"
		  "my ($f_name, $package) = @_;"
		  "destroy_package($package);"
		  "my $strin=load_file($f_name);"
		  "return 2 if($strin eq \"__FAILED__\");"
		  "my $eval = qq{package $package; $strin;};"

		  "{"
		  "  eval $eval;"
		  "}"

		  "if($@) {"
		    /*"  #something went wrong\n"*/
		    "die(\"Errors loading file $f_name: $@\");"
		  "}"

		  "return 0;"
		"}"
	};

	my_perl = perl_alloc();
	PERL_SET_CONTEXT(my_perl);
	PL_perl_destruct_level = 1;
	perl_construct(my_perl);
#ifdef DEBUG
	perl_parse(my_perl, xs_init, 4, perl_args, NULL);
#else
	perl_parse(my_perl, xs_init, 3, perl_args, NULL);
#endif
#ifdef HAVE_PERL_EVAL_PV
	eval_pv(perl_definitions, TRUE);
#else
	perl_eval_pv(perl_definitions, TRUE); /* deprecated */
#endif
	perl_run(my_perl);
}

static void
perl_end(void)
{
	if (my_perl == NULL)
		return;

	PL_perl_destruct_level = 1;
	PERL_SET_CONTEXT(my_perl);
	perl_eval_pv(
		"foreach my $lib (@DynaLoader::dl_modules) {"
		  "if ($lib =~ /^Purple\\b/) {"
		    "$lib .= '::deinit();';"
		    "eval $lib;"
		  "}"
		"}",
		TRUE);

	PL_perl_destruct_level = 1;
	PERL_SET_CONTEXT(my_perl);
	perl_destruct(my_perl);
	perl_free(my_perl);
	my_perl = NULL;
}

void
purple_perl_callXS(void (*subaddr)(pTHX_ CV *cv), CV *cv, SV **mark)
{
	dSP;

	PUSHMARK(mark);
	(*subaddr)(aTHX_ cv);

	PUTBACK;
}

static gboolean
probe_perl_plugin(PurplePlugin *plugin)
{
	/* XXX This would be much faster if I didn't create a new
	 *     PerlInterpreter every time I probed a plugin */

	PerlInterpreter *prober = perl_alloc();
	char *argv[] = {"", plugin->path };
	gboolean status = TRUE;
	HV *plugin_info;
	PERL_SET_CONTEXT(prober);
	PL_perl_destruct_level = 1;
	perl_construct(prober);

	perl_parse(prober, xs_init, 2, argv, NULL);

	perl_run(prober);

	plugin_info = perl_get_hv("PLUGIN_INFO", FALSE);

	if (plugin_info == NULL)
		status = FALSE;
	else if (!hv_exists(plugin_info, "perl_api_version",
	                    strlen("perl_api_version")) ||
	         !hv_exists(plugin_info, "name", strlen("name")) ||
	         !hv_exists(plugin_info, "load", strlen("load"))) {
		/* Not a valid plugin. */

		status = FALSE;
	} else {
		SV **key;
		int perl_api_ver;

		key = hv_fetch(plugin_info, "perl_api_version",
		               strlen("perl_api_version"), 0);

		perl_api_ver = SvIV(*key);

		if (perl_api_ver != 2)
			status = FALSE;
		else {
			PurplePluginInfo *info;
			PurplePerlScript *gps;
			char *basename;
			STRLEN len;

			info = g_new0(PurplePluginInfo, 1);
			gps  = g_new0(PurplePerlScript, 1);

			info->magic = PURPLE_PLUGIN_MAGIC;
			info->major_version = PURPLE_MAJOR_VERSION;
			info->minor_version = PURPLE_MINOR_VERSION;
			info->type = PURPLE_PLUGIN_STANDARD;

			info->dependencies = g_list_append(info->dependencies,
			                                   PERL_PLUGIN_ID);

			gps->plugin = plugin;

			basename = g_path_get_basename(plugin->path);
			purple_perl_normalize_script_name(basename);
			gps->package = g_strdup_printf("Purple::Script::%s",
			                               basename);
			g_free(basename);

			/* We know this one exists. */
			key = hv_fetch(plugin_info, "name", strlen("name"), 0);
			info->name = g_strdup(SvPV(*key, len));
			/* Set id here in case we don't find one later. */
			info->id = g_strdup(SvPV(*key, len));

#ifdef PURPLE_GTKPERL
			if ((key = hv_fetch(plugin_info, "GTK_UI",
			                    strlen("GTK_UI"), 0)))
				info->ui_requirement = PURPLE_GTK_PLUGIN_TYPE;
#endif

			if ((key = hv_fetch(plugin_info, "url",
			                    strlen("url"), 0)))
				info->homepage = g_strdup(SvPV(*key, len));

			if ((key = hv_fetch(plugin_info, "author",
			                    strlen("author"), 0)))
				info->author = g_strdup(SvPV(*key, len));

			if ((key = hv_fetch(plugin_info, "summary",