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/*
* cdebconf gtk plugin to get random data
*
* Copyright © 2008 Jérémy Bobbio <lunar@debian.org>
* See debian/copyright for license.
*
*/
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <cdebconf/frontend.h>
#include <cdebconf/cdebconf_gtk.h>
#include <gtk/gtk.h>
#define MODULE "entropy"
#define FIFO "/var/run/random.fifo"
#define DEFAULT_KEYSIZE 2925
/* Here's the plugin! */
int cdebconf_gtk_handler_entropy(struct frontend * fe,
struct question * question,
GtkWidget * question_box);
struct entropy {
struct frontend * fe;
GtkWidget * progress_bar;
GtkWidget * continue_button;
GtkWidget * entry;
guint64 keysize;
const char * fifo;
const char * success_template;
guint64 bytes_read;
int random_fd;
GIOChannel * random_channel;
guint random_source_id;
int fifo_fd;
guint8 random_byte;
};
static void destroy_entropy(struct entropy * entropy_data)
{
if (0 < entropy_data->fifo_fd) {
(void) close(entropy_data->fifo_fd);
}
if (NULL != entropy_data->fifo) {
(void) unlink(entropy_data->fifo);
}
if (NULL == entropy_data->random_channel) {
g_io_channel_unref(entropy_data->random_channel);
}
if (0 < entropy_data->random_fd) {
(void) close(entropy_data->random_fd);
}
(void) munlock(&entropy_data->random_byte, sizeof (guint8));
if (NULL != entropy_data->progress_bar) {
g_object_unref(G_OBJECT(entropy_data->progress_bar));
}
if (NULL != entropy_data->entry) {
g_object_unref(G_OBJECT(entropy_data->entry));
}
if (NULL != entropy_data->continue_button) {
g_object_unref(G_OBJECT(entropy_data->continue_button));
}
g_free(entropy_data);
}
static struct entropy * init_entropy(struct frontend * fe,
struct question * question)
{
struct entropy * entropy_data;
if (NULL == (entropy_data = g_malloc0(sizeof (struct entropy)))) {
g_critical("g_malloc0 failed.");
return NULL;
}
entropy_data->fe = fe;
if (-1 == mlock(&entropy_data->random_byte, sizeof (guint8))) {
g_critical("mlock failed: %s", strerror(errno));
goto failed;
}
entropy_data->success_template = question_get_variable(
question, "SUCCESS");
if (NULL == entropy_data->success_template) {
entropy_data->success_template = "debconf/entropy/success";
}
entropy_data->random_fd = open("/dev/random", O_RDONLY | O_NONBLOCK);
if (-1 == entropy_data->random_fd) {
g_critical("open random_fd failed: %s", strerror(errno));
goto failed;
}
entropy_data->random_channel = g_io_channel_unix_new(entropy_data->random_fd);
if (NULL == entropy_data->random_channel) {
g_critical("g_io_channel_unix_new failed.");
goto failed;
}
entropy_data->fifo = question_get_variable(question, "FIFO");
if (NULL == entropy_data->fifo) {
entropy_data->fifo = FIFO;
}
if (-1 == mkfifo(entropy_data->fifo, 0600)) {
g_critical("mkfifo failed: %s", strerror(errno));
goto failed;
}
entropy_data->fifo_fd = open(entropy_data->fifo, O_WRONLY);
if (-1 == entropy_data->fifo_fd) {
g_critical("open fifo_fd failed: %s", strerror(errno));
goto failed;
}
return entropy_data;
failed:
destroy_entropy(entropy_data);
return NULL;
}
static void cleanup(GtkWidget * widget, struct entropy * entropy_data)
{
if (0 != entropy_data->random_source_id) {
g_source_remove(entropy_data->random_source_id);
}
destroy_entropy(entropy_data);
}
static void handle_continue(GtkWidget * button, struct entropy * entropy_data)
{
cdebconf_gtk_set_answer_ok(entropy_data->fe);
}
static gboolean add_help_text(struct entropy * entropy_data,
GtkWidget * container)
{
GtkWidget * view;
GtkTextBuffer * buffer;
GtkTextIter start;
GtkTextIter end;
GtkStyle * style;
char * help_text;
help_text = cdebconf_gtk_get_text(
entropy_data->fe, "debconf/entropy/gtk/help",
"You can help speed up the process by entering random characters on "
"the keyboard or by moving the mouse randomly, or just wait until "
"enough key data has been collected (which can take a long time).");
/* XXX: check NULL! */
view = gtk_text_view_new();
/* XXX: check NULL! */
buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(view));
gtk_text_buffer_set_text(buffer, help_text, -1 /* until '\0' */);
g_free(help_text);
gtk_text_view_set_editable(GTK_TEXT_VIEW(view), FALSE);
gtk_text_view_set_cursor_visible(GTK_TEXT_VIEW(view), FALSE);
gtk_text_view_set_wrap_mode(GTK_TEXT_VIEW(view), GTK_WRAP_WORD_CHAR);
gtk_text_view_set_left_margin(GTK_TEXT_VIEW(view), DEFAULT_PADDING);
gtk_text_view_set_right_margin(GTK_TEXT_VIEW(view), DEFAULT_PADDING);
gtk_text_buffer_create_tag(buffer, "italic", "style",
PANGO_STYLE_ITALIC, NULL);
gtk_text_buffer_get_start_iter(buffer, &start);
gtk_text_buffer_get_end_iter(buffer, &end);
gtk_text_buffer_apply_tag_by_name(buffer, "italic", &start, &end);
style = gtk_widget_get_style(
gtk_widget_get_toplevel(entropy_data->continue_button));
gtk_widget_modify_base(view, GTK_STATE_NORMAL, style->bg);
gtk_box_pack_start(GTK_BOX(container), view,
FALSE /* don't expand */, FALSE /* don't fill */,
DEFAULT_PADDING);
return TRUE;
}
static gboolean add_action_text(struct entropy * entropy_data,
GtkWidget * container)
{
GtkWidget * label;
char * action_text;
action_text = cdebconf_gtk_get_text(
entropy_data->fe, "debconf/entropy/gtk/action",
"Enter random characters or move mouse randomly");
label = gtk_label_new(action_text);
g_free(action_text);
gtk_label_set_line_wrap(GTK_LABEL(label), TRUE);
gtk_misc_set_alignment(GTK_MISC(label), 0 /* left */, 0 /* top */);
gtk_box_pack_start(GTK_BOX(container), label, FALSE /* no expand */,
TRUE /* fill */, DEFAULT_PADDING);
return TRUE;
}
static GtkWidget * create_entropy_widget(struct entropy * entropy_data)
{
GtkWidget * vbox;
GtkWidget * continue_button;
GtkWidget * progress_bar;
GtkWidget * entry;
continue_button = cdebconf_gtk_create_continue_button(entropy_data->fe);
if (NULL == continue_button) {
g_critical("cdebconf_gtk_create_continue_button failed.");
return NULL;
}
GTK_WIDGET_UNSET_FLAGS(continue_button, GTK_CAN_FOCUS);
gtk_widget_set_sensitive(continue_button, FALSE);
g_signal_connect(continue_button, "clicked", G_CALLBACK(handle_continue),
entropy_data);
g_object_ref(G_OBJECT(continue_button));
entropy_data->continue_button = continue_button;
vbox = gtk_vbox_new(FALSE /* not homogenous */, DEFAULT_PADDING);
if (NULL == vbox) {
g_critical("gtk_vbox_new failed.");
return NULL;
}
if (!add_help_text(entropy_data, vbox)) {
g_critical("add_help_text failed.");
return NULL;
}
if (NULL == (progress_bar = gtk_progress_bar_new())) {
g_critical("gtk_progress_bar_new failed.");
return NULL;
}
/* write a space to prepare progress bar height to receive the success
* confirmation at the end. */
gtk_progress_bar_set_text(GTK_PROGRESS_BAR(progress_bar), " ");
gtk_box_pack_start(GTK_BOX(vbox), progress_bar, FALSE /* no expand */,
FALSE /* no fill */, DEFAULT_PADDING);
g_object_ref(G_OBJECT(progress_bar));
entropy_data->progress_bar = progress_bar;
if (!add_action_text(entropy_data, vbox)) {
g_critical("add_action_text failed.");
return NULL;
}
entry = gtk_entry_new();
if (NULL == entry) {
g_critical("gtk_entry_new failed.");
return NULL;
}
GTK_WIDGET_SET_FLAGS(entry, GTK_CAN_DEFAULT);
gtk_entry_set_visibility(GTK_ENTRY(entry), FALSE /* password style */);
gtk_entry_set_activates_default(GTK_ENTRY(entry),
TRUE /* activate on Enter */);
gtk_box_pack_start(GTK_BOX(vbox), entry, FALSE /* no expand */,
FALSE /* no fill */, DEFAULT_PADDING);
g_object_ref(G_OBJECT(entry));
entropy_data->entry = entry;
g_signal_connect(vbox, "destroy", G_CALLBACK(cleanup), entropy_data);
return vbox;
}
static void refresh_progress_bar(struct entropy * entropy_data)
{
gdouble fraction;
gchar * label;
fraction = (gdouble) entropy_data->bytes_read /
(gdouble) entropy_data->keysize;
if (1.0 <= fraction) {
label = cdebconf_gtk_get_text(
entropy_data->fe, entropy_data->success_template,
"Key data has been created successfully.");
} else {
label = g_strdup_printf("%2.0f%%", fraction * 100.0);
}
gdk_threads_enter();
gtk_progress_bar_set_fraction(
GTK_PROGRESS_BAR(entropy_data->progress_bar),
fraction);
gtk_progress_bar_set_text(GTK_PROGRESS_BAR(entropy_data->progress_bar),
label);
gdk_threads_leave();
g_free(label);
}
static gboolean move_bytes(struct entropy * entropy_data)
{
gssize n;
while (entropy_data->bytes_read < entropy_data->keysize) {
n = read(entropy_data->random_fd, &entropy_data->random_byte,
sizeof (guint8));
if (1 > n) {
if (EAGAIN == errno) {
break;
}
g_critical("read failed: %s", strerror(errno));
return FALSE;
}
n = write(entropy_data->fifo_fd, &entropy_data->random_byte,
sizeof (guint8));
if (1 > n) {
g_critical("write failed: %s", strerror(errno));
return FALSE;
}
entropy_data->random_byte = 0;
entropy_data->bytes_read++;
}
return TRUE;
}
static void allow_continue(struct entropy * entropy_data)
{
gdk_threads_enter();
gtk_widget_set_sensitive(entropy_data->entry, FALSE);
gtk_widget_set_sensitive(entropy_data->continue_button, TRUE);
GTK_WIDGET_SET_FLAGS(entropy_data->continue_button, GTK_CAN_FOCUS);
gtk_widget_grab_default(entropy_data->continue_button);
gdk_threads_leave();
}
static gboolean gather_entropy(GIOChannel *source, GIOCondition condition,
struct entropy * entropy_data)
{
if (DC_NO_ANSWER != cdebconf_gtk_get_answer(entropy_data->fe)) {
return FALSE;
}
if (G_IO_ERR == (condition & G_IO_ERR)) {
return FALSE;
}
if (G_IO_IN != (condition & G_IO_IN)) {
/* Wait for some data. */
return TRUE;
}
if (!move_bytes(entropy_data)) {
cdebconf_gtk_set_answer_notok(entropy_data->fe);
return FALSE;
}
refresh_progress_bar(entropy_data);
/* Reset text entry to prevent overflow. */
gtk_entry_set_text(GTK_ENTRY(entropy_data->entry), "");
if (entropy_data->bytes_read < entropy_data->keysize) {
return TRUE;
}
allow_continue(entropy_data);
return FALSE;
}
static gboolean set_keysize(struct entropy * entropy_data,
struct question * question) {
const char * keysize_string;
keysize_string = question_get_variable(question, "KEYSIZE");
if (NULL == keysize_string) {
entropy_data->keysize = DEFAULT_KEYSIZE;
return TRUE;
}
entropy_data->keysize = g_ascii_strtoull(
keysize_string, NULL /* don't get last parsed byte */,
0 /* default base */);
if (G_MAXUINT64 == entropy_data->keysize) {
g_critical("keysize out of range");
return FALSE;
}
if (0 == entropy_data->keysize) {
g_critical("can't parse KEYSIZE");
return FALSE;
}
return TRUE;
}
static void set_nothing(struct question * question, void * dummy)
{
/* entropy questions do not put anything in the database */
return;
}
int cdebconf_gtk_handler_entropy(struct frontend * fe,
struct question * question,
GtkWidget * question_box)
{
struct entropy * entropy_data;
GtkWidget * widget;
if (!IS_QUESTION_SINGLE(question)) {
g_critical("entropy plugin does not work alongside other questions.");
return DC_NOTOK;
}
if (NULL == (entropy_data = init_entropy(fe, question))) {
g_critical("init_entropy failed.");
return DC_NOTOK;
}
if (!set_keysize(entropy_data, question)) {
g_critical("set_keysize failed.");
goto failed;
}
if (NULL == (widget = create_entropy_widget(entropy_data))) {
g_critical("create_widget failed.");
goto failed;
}
entropy_data->random_source_id = g_io_add_watch(
entropy_data->random_channel, G_IO_IN | G_IO_ERR,
(GIOFunc) gather_entropy, entropy_data);
cdebconf_gtk_add_common_layout(fe, question, question_box, widget);
gtk_widget_grab_focus(entropy_data->entry);
gtk_widget_grab_default(entropy_data->entry);
cdebconf_gtk_register_setter(fe, SETTER_FUNCTION(set_nothing), question,
NULL);
return DC_OK;
failed:
destroy_entropy(entropy_data);
return DC_NOTOK;
}
/* vim: et sw=4 si
*/
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