/* -*-Mode: c-*- */
/* Copyright (C) 1997 Red Hat Software, Inc.
 * Copyright 2001 Ximian, Inc.
 *
 * This 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <config.h>

#include <unistd.h>

#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>

#include <gdk/gdkx.h>
#include <gnome.h>

#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gdk-pixbuf/gnome-canvas-pixbuf.h>

#include "root-manager-wrap.h"

#define MAXLINE 512

int childout[2];
int childin[2];
int childout_tag;

void
userhelper_runv(char *path, int new_fd)
{
	pid_t pid;
	int retval;
	int i;
	int stdin_save = STDIN_FILENO;
	int stdout_save = STDOUT_FILENO;
	int stderr_save = STDERR_FILENO;
	char *nargs[256]; /* only used internally, we know this will not overflow */

	if((pipe(childout) == -1) || (pipe(childin) == -1))
	{
		fprintf(stderr, _("Pipe error.\n"));
		exit(1);
	}

	if((pid = fork()) < 0)
	{
		fprintf(stderr, _("Cannot fork().\n"));
	}
	else if(pid > 0)		/* parent */
	{
		close(childout[1]);
		close(childin[0]);
		close (new_fd);

		childout_tag = gdk_input_add(childout[0], GDK_INPUT_READ, (GdkInputFunction) userhelper_read_childout, NULL);

	}
	else				/* child */
	{
		close(childout[0]);
		close(childin[1]);

		if(childout[1] != STDOUT_FILENO)
		{
			if(((stdout_save = dup(STDOUT_FILENO)) == -1) ||
			   (dup2(childout[1], STDOUT_FILENO) != STDOUT_FILENO))
			{
				fprintf(stderr, _("dup2() error.\n"));
				exit(2);
			}
			close(childout[1]);
		}
		if(childin[0] != STDIN_FILENO)
		{
			if(((stdin_save = dup(STDIN_FILENO)) == -1) ||
			   (dup2(childin[0], STDIN_FILENO) != STDIN_FILENO))
			{
				fprintf(stderr, _("dup2() error.\n"));
				exit(2);
			}
		}

		memset(&nargs, 0, sizeof(nargs));
		nargs[0] = UH_PATH;
		nargs[1] = g_strdup_printf ("%d", new_fd);
#if 0
		nargs[1] = "-d";
		nargs[2] = g_strdup_printf("%d,%d,%d", stdin_save, stdout_save,
					   stderr_save);
		for(i = 3; i < sizeof(nargs) / sizeof(nargs[0]); i++) {
			nargs[i] = args[i - 2];
			if(nargs[i] == NULL) {
				break;
			}
		}
#endif
#ifdef DEBUG_USERHELPER
		for(i = 0; i < sizeof(nargs) / sizeof(nargs[0]); i++) {
			if(nargs[i] == NULL) {
				break;
			}
			fprintf(stderr, "Exec arg = \"%s\".\n", nargs[i]);
		}
#endif
		retval = execv(path, nargs);

		if(retval < 0) {
			fprintf(stderr, _("execl() error, errno=%d\n"), errno);
		}

		_exit(0);

	}
}
void
userhelper_run(char *path, ...)
{
	va_list ap;
	char *args[256]; /* only used internally, we know this will not overflow */
	int i = 0;

	va_start(ap, path);
	while((i < 255) && ((args[i++] = va_arg(ap, char *)) != NULL));
	va_end(ap);

	userhelper_runv(path, args);
}

void
userhelper_parse_exitstatus(int exitstatus)
{
	GtkWidget* message_box;

	switch(exitstatus)
	{
	case 0:
		message_box = gnome_ok_dialog (_("Information updated."));
		break;
	case ERR_PASSWD_INVALID:
		message_box = gnome_error_dialog(_("The password you typed is invalid.\nPlease try again."));
		break;
	case ERR_FIELDS_INVALID:
		message_box = gnome_error_dialog(_("One or more of the changed fields is invalid.\nThis is probably due to either colons or commas in one of the fields.\nPlease remove those and try again."));
		break;
	case ERR_SET_PASSWORD:
		message_box = gnome_error_dialog(_("Password resetting error."));
		break;
	case ERR_LOCKS:
		message_box = gnome_error_dialog(_("Some systems files are locked.\nPlease try again in a few moments."));
		break;
	case ERR_NO_USER:
		message_box = gnome_error_dialog(_("Unknown user."));
		break;
	case ERR_NO_RIGHTS:
		message_box = gnome_error_dialog(_("Insufficient rights."));
		break;
	case ERR_INVALID_CALL:
		message_box = gnome_error_dialog(_("Invalid call to sub process."));
		break;
	case ERR_SHELL_INVALID:
		message_box = gnome_error_dialog(_("Your current shell is not listed in /etc/shells.\nYou are not allowed to change your shell.\nConsult your system administrator."));
		break;
	case ERR_NO_MEMORY:
		/* well, this is unlikely to work either, but at least we tried... */
		message_box = gnome_error_dialog(_("Out of memory."));
		break;
	case ERR_EXEC_FAILED:
		message_box = gnome_error_dialog(_("The exec() call failed."));
		break;
	case ERR_NO_PROGRAM:
		message_box = gnome_error_dialog(_("Failed to find selected program."));
		break;
	case ERR_UNK_ERROR:
		message_box = gnome_error_dialog(_("Unknown error."));
		break;
	default:
		message_box = gnome_error_dialog(_("Unknown exit code."));
		break;
	}

	gnome_dialog_run_and_close (GNOME_DIALOG (message_box));
}

static void
userhelper_grab_focus(GtkWidget *widget, GdkEvent *map_event, gpointer data)
{
	int ret;
	GtkWidget *toplevel;
	/* grab focus for the toplevel of this widget, so that peers can
	 * get events too */
	toplevel = gtk_widget_get_toplevel(widget);
	ret = gdk_keyboard_grab(toplevel->window, TRUE, GDK_CURRENT_TIME);
}

static void
mark_void(GtkWidget *widget, gpointer target)
{
	if(target != NULL) {
		*(gpointer*)target = NULL;
	}
}

GtkWidget *
make_pixmap (const char *filename)
{
	GdkPixbuf *pb;
	GtkWidget *canvas;
	GtkWidget *frame;
	int width, height;

	pb = gdk_pixbuf_new_from_file (filename);
	if (!pb)
		return NULL;

	width  = gdk_pixbuf_get_width  (pb);
	height = gdk_pixbuf_get_height (pb);

	frame = gtk_frame_new (NULL);
	gtk_widget_set_usize (frame, width, height);

	gtk_widget_push_colormap (gdk_rgb_get_cmap ());
	
	canvas = gnome_canvas_new_aa ();
	
	gtk_widget_pop_colormap ();

	gnome_canvas_set_scroll_region (GNOME_CANVAS (canvas), 0, 0, width, height);
	gnome_canvas_item_new (GNOME_CANVAS_GROUP (GNOME_CANVAS (canvas)->root),
			       GNOME_TYPE_CANVAS_PIXBUF, "pixbuf", pb, NULL);
	
	gtk_container_add (GTK_CONTAINER (frame), canvas);
	gtk_widget_show_all (frame);
	return frame;
}

void
userhelper_parse_childout(char* outline)
{
	char *prompt;
	char *rest = NULL;
	char *title;
	int prompt_type;
	static response *resp = NULL;
	GtkWidget *pixmap;
	int ret;

	if (resp != NULL) {
		if(!GTK_IS_WINDOW(resp->top)) {
			g_free(resp->user);
			g_free(resp);
			resp = NULL;
		}
	}

	if (resp == NULL) {
		GtkWidget *hbox;

		resp = g_malloc0(sizeof(response));

		resp->user = g_strdup(getlogin());


		resp->top = gnome_dialog_new (_("Input"),
						GNOME_STOCK_BUTTON_OK,
						GNOME_STOCK_BUTTON_CANCEL,
						NULL);

		gnome_dialog_close_hides (GNOME_DIALOG (resp->top), TRUE);
		gnome_dialog_set_default (GNOME_DIALOG (resp->top), 0);
		
		gtk_window_position(GTK_WINDOW(resp->top), GTK_WIN_POS_CENTER);

		gtk_signal_connect(GTK_OBJECT(resp->top), "map",
				   GTK_SIGNAL_FUNC(userhelper_grab_focus), NULL);

		hbox = gtk_hbox_new (FALSE, GNOME_PAD_BIG);
		gtk_box_pack_start (GTK_BOX (GNOME_DIALOG (resp->top)->vbox), hbox, FALSE, FALSE, 0);
		
		pixmap = make_pixmap (UH_KEY_PIXMAP_PATH);
		if(pixmap != NULL) {
			gtk_box_pack_start (GTK_BOX (hbox), pixmap, FALSE, FALSE, 0);
		}

		resp->table = gtk_table_new (1, 2, FALSE);
		resp->rows = 1;

		gtk_object_set_data(GTK_OBJECT(resp->top), UH_ACTION_AREA, hbox);
		gtk_box_pack_start(GTK_BOX(hbox), resp->table, TRUE, TRUE, GNOME_PAD);

#if 0
		resp->ok = gtk_button_new_with_label(_(UD_OK_TEXT));
		gtk_misc_set_padding(GTK_MISC(GTK_BIN(resp->ok)->child), 4, 0);
		gtk_box_pack_start(GTK_BOX(hbox), resp->ok, FALSE, FALSE, 0);

		resp->cancel = gtk_button_new_with_label(_(UD_CANCEL_TEXT));
		gtk_misc_set_padding(GTK_MISC(GTK_BIN(resp->cancel)->child), 4, 0);
		gtk_box_pack_start(GTK_BOX(hbox), resp->cancel, FALSE, FALSE, 0);

		gtk_signal_connect(GTK_OBJECT(resp->top), "delete_event", 
				   (GtkSignalFunc) userhelper_fatal_error, NULL);
		gtk_signal_connect(GTK_OBJECT(resp->cancel), "clicked", 
				   (GtkSignalFunc) userhelper_fatal_error, NULL);

		gtk_signal_connect(GTK_OBJECT(resp->ok), "clicked", 
				   (GtkSignalFunc) userhelper_write_childin, resp);
#endif

		gtk_object_set_user_data(GTK_OBJECT(resp->top), resp);
		gtk_widget_show_all (hbox);
	}

	if(isdigit(outline[0])) {
		gboolean echo = TRUE;
		message *msg = g_malloc(sizeof(message));

		prompt_type = strtol(outline, &prompt, 10);
		if((prompt != NULL) && (strlen(prompt) > 0)) {
			while((isspace(prompt[0]) && (prompt[0] != '\0') && (prompt[0] != '\n'))){
				prompt++;
			}
		}

		/* snip off terminating newlines in the prompt string and save a pointer to
		 * interate the parser along */
		rest = strchr(prompt, '\n');
		if(rest != NULL) {
			*rest = '\0';
			rest++;
			if (rest[0] == '\0') {
				rest = NULL;
			}
		}
#ifdef DEBUG_USERHELPER
		fprintf (stderr, "(%d) \"%s\"\n", prompt_type, prompt);
#endif

		msg->type = prompt_type;
		msg->message = prompt;
		msg->data = NULL;
		msg->entry = NULL;

		echo = TRUE;
		switch(prompt_type) {
		case UH_ECHO_OFF_PROMPT:
			echo = FALSE;
			/* fall through */
		case UH_ECHO_ON_PROMPT:
			msg->label = gtk_label_new(prompt);
			gtk_label_set_line_wrap(GTK_LABEL(msg->label), FALSE);
			gtk_misc_set_alignment(GTK_MISC(msg->label), 1.0, 1.0);

			msg->entry = gtk_entry_new();
			gtk_entry_set_visibility(GTK_ENTRY(msg->entry), echo);

			if(resp->head == NULL) resp->head = msg->entry;
			resp->tail = msg->entry;

			gtk_table_attach(GTK_TABLE(resp->table), msg->label,
					 resp->left + 0, resp->left + 1, resp->rows, resp->rows + 1,
					 GTK_EXPAND | GTK_FILL, 0, 2, 2);
			gtk_table_attach(GTK_TABLE(resp->table), msg->entry,
					 resp->left + 1, resp->left + 2, resp->rows, resp->rows + 1,
					 GTK_EXPAND | GTK_FILL, 0, 2, 2);

			resp->message_list = g_slist_append(resp->message_list, msg);
			resp->responses++;
			resp->rows++;
#ifdef DEBUG_USERHELPER
			fprintf (stderr, _("Need %d responses.\n"), resp->responses);
#endif
			break;

		case UH_FALLBACK:
#if 0
			msg->label = gtk_label_new(prompt);
			gtk_label_set_line_wrap(GTK_LABEL(msg->label), FALSE);
			gtk_table_attach(GTK_TABLE(resp->table), msg->label,
					 resp->left + 0, resp->left + 2, resp->rows, resp->rows + 1,
					 0, 0, 2, 2);
			resp->message_list = g_slist_append(resp->message_list, msg);
#else
			resp->fallback = atoi(prompt) != 0;
#endif
			break;

		case UH_USER:
			if(strstr(prompt, "<user>") == NULL) {
				g_free(resp->user);
				resp->user = g_strdup(prompt);
			}
			break;

		case UH_SERVICE_NAME:
			title = _("In order to make changes to your system, you\n"
				  "must enter the administrator (root) password.");

			msg->label = gtk_label_new(title);
			gtk_misc_set_alignment (GTK_MISC (msg->label), 0.5, 0.0);
			gtk_label_set_line_wrap(GTK_LABEL(msg->label), FALSE);
			gtk_table_attach(GTK_TABLE(resp->table), msg->label,
					 0, resp->left + 2, 0, 1,
					 GTK_EXPAND | GTK_FILL, 
					 GTK_EXPAND | GTK_FILL, 2, 2);
			resp->message_list = g_slist_append(resp->message_list, msg);
			break;

		case UH_ERROR_MSG:
			gtk_window_set_title(GTK_WINDOW(resp->top), _("Error"));
			/* fall through */
		case UH_INFO_MSG:
			msg->label = gtk_label_new(prompt);
			gtk_label_set_line_wrap(GTK_LABEL(msg->label), FALSE);
			gtk_table_attach(GTK_TABLE(resp->table), msg->label,
					 resp->left + 0, resp->left + 2, resp->rows, resp->rows + 1, 0, 0, 2, 2);
			resp->message_list = g_slist_append(resp->message_list, msg);
			resp->rows++;
			break;

		case UH_EXPECT_RESP:
			g_free(msg); /* useless */
			if (resp->responses != atoi(prompt)) {
				fprintf (stderr, _("You want %d response(s) from %d entry fields!?!?!\n"),
					atoi(prompt), resp->responses);
				exit (1);
			}

			if (resp->fallback) {
				gnome_dialog_append_button (GNOME_DIALOG (resp->top), _("Run Unprivileged"));
#if 0
				gpointer a = GTK_WIDGET(gtk_object_get_data(GTK_OBJECT(resp->top),
									    UH_ACTION_AREA));
				GtkWidget *hbox = GTK_WIDGET(a);
				resp->unprivileged = gtk_button_new_with_label(_(UD_FALLBACK_TEXT));
				gtk_misc_set_padding(GTK_MISC(GTK_BIN(resp->unprivileged)->child),
						     4, 0);
				gtk_box_pack_start(GTK_BOX(hbox), resp->unprivileged,
						   FALSE, FALSE, 0);
				if(resp->unprivileged != NULL) {
					gtk_signal_connect(GTK_OBJECT(resp->unprivileged), "clicked", 
							   GTK_SIGNAL_FUNC(userhelper_write_childin), resp);
				}
#endif
			}

			/* here is where we do the thingie */
			gtk_widget_show_all (resp->table);

			if(GTK_IS_ENTRY(resp->head)) {
				gtk_widget_grab_focus(resp->head);
			}
			if(GTK_IS_ENTRY(resp->tail)) {
				gnome_dialog_editable_enters (GNOME_DIALOG (resp->top),
							      GTK_EDITABLE (resp->tail));
			}
			ret = gnome_dialog_run_and_close (GNOME_DIALOG (resp->top));
			userhelper_write_childin (ret, resp);

			break;
		default:
			/* ignore, I guess... */
			break;
		}
	}

	if(rest != NULL) userhelper_parse_childout(rest);
}

void
userhelper_read_childout(gpointer data, int source, GdkInputCondition cond)
{
	char* output;
	int count;

	if(cond != GDK_INPUT_READ)
	{
		/* Serious error, this is.  Panic. */
		exit (1);
	}

	output = g_malloc(MAXLINE + 1);

	count = read(source, output, MAXLINE);
	if (count == -1)
	{
		exit (0);
	}
	if (count == 0)
	{
		gdk_input_remove(childout_tag);
		childout_tag = -1;
	}
	output[count] = '\0';

	userhelper_parse_childout(output);
	g_free(output);
}

void
userhelper_write_childin(int button, response *resp)
{
	char* input;
	int len;
	guchar byte;
	GSList *message_list = resp->message_list;

	switch (button) {
	case 2: 
		byte = UH_ABORT;
		for (message_list = resp->message_list;
		     (message_list != NULL) && (message_list->data != NULL);
		     message_list = g_slist_next(message_list)) {
			message *m = (message*)message_list->data;
#ifdef DEBUG_USERHELPER
			fprintf(stderr, "message %d, \"%s\"\n", m->type, m->message);
#endif
			if(GTK_IS_ENTRY(m->entry)) {
				write(childin[1], &byte, 1);
				write(childin[1], "\n", 1);
			}
		}
		break;
	case 0:
		byte = UH_TEXT;
		for (message_list = resp->message_list;
		     (message_list != NULL) && (message_list->data != NULL);
		     message_list = g_slist_next(message_list)) {
			message *m = (message*)message_list->data;
#ifdef DEBUG_USERHELPER
			fprintf(stderr, "message %d, \"%s\"\n", m->type, m->message);
#endif
			if(GTK_IS_ENTRY(m->entry)) {
				input = gtk_entry_get_text(GTK_ENTRY(m->entry));
				len = strlen(input);
				write(childin[1], &byte, 1);
				write(childin[1], input, len);
				write(childin[1], "\n", 1);
			}
		}
		break;
	default:
		gtk_main_quit ();
		break;
	}
	gtk_widget_destroy(resp->top);
}

void
userhelper_sigchld()
{
	pid_t pid;
	int status;

	signal(SIGCHLD, userhelper_sigchld);
  
	pid = waitpid(0, &status, WNOHANG);
  
	if(WIFEXITED(status))
	{
		userhelper_parse_exitstatus(WEXITSTATUS(status));
	}
}