git.ozlabs.org Git - petitboot/blob - ui/ncurses/nc-config.c

   1 /*
   2  *  Copyright (C) 2013 IBM Corporation
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; version 2 of the License.
   7  *
   8  *  This program is distributed in the hope that it will be useful,
   9  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  *  GNU General Public License for more details.
  12  *
  13  *  You should have received a copy of the GNU General Public License
  14  *  along with this program; if not, write to the Free Software
  15  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  16  */
  17
  18 #if defined(HAVE_CONFIG_H)
  19 #include "config.h"
  20 #endif
  21
  22 #include <errno.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25
  26 #include <pb-config/pb-config.h>
  27 #include <talloc/talloc.h>
  28 #include <types/types.h>
  29 #include <log/log.h>
  30
  31 #include "nc-cui.h"
  32 #include "nc-config.h"
  33 #include "nc-widgets.h"
  34
  35 #define N_FIELDS        24
  36
  37 extern const char *config_help_text;
  38
  39 enum net_conf_type {
  40         NET_CONF_TYPE_DHCP_ALL,
  41         NET_CONF_TYPE_DHCP_ONE,
  42         NET_CONF_TYPE_STATIC,
  43 };
  44
  45 struct config_screen {
  46         struct nc_scr           scr;
  47         struct cui              *cui;
  48         struct nc_widgetset     *widgetset;
  49         WINDOW                  *pad;
  50
  51         bool                    exit;
  52         bool                    show_help;
  53         void                    (*on_exit)(struct cui *);
  54
  55         int                     scroll_y;
  56
  57         int                     label_x;
  58         int                     field_x;
  59         int                     network_config_y;
  60
  61         enum net_conf_type      net_conf_type;
  62
  63         struct {
  64                 struct nc_widget_checkbox       *autoboot_f;
  65                 struct nc_widget_label          *autoboot_l;
  66                 struct nc_widget_textbox        *timeout_f;
  67                 struct nc_widget_label          *timeout_l;
  68                 struct nc_widget_label          *timeout_help_l;
  69
  70                 struct nc_widget_label          *network_l;
  71                 struct nc_widget_select         *network_f;
  72
  73                 struct nc_widget_label          *iface_l;
  74                 struct nc_widget_select         *iface_f;
  75                 struct nc_widget_label          *ip_addr_l;
  76                 struct nc_widget_textbox        *ip_addr_f;
  77                 struct nc_widget_label          *ip_mask_l;
  78                 struct nc_widget_textbox        *ip_mask_f;
  79                 struct nc_widget_label          *ip_addr_mask_help_l;
  80                 struct nc_widget_label          *gateway_l;
  81                 struct nc_widget_textbox        *gateway_f;
  82                 struct nc_widget_label          *gateway_help_l;
  83                 struct nc_widget_label          *dns_l;
  84                 struct nc_widget_textbox        *dns_f;
  85                 struct nc_widget_label          *dns_dhcp_help_l;
  86                 struct nc_widget_label          *dns_help_l;
  87
  88                 struct nc_widget_button         *ok_b;
  89                 struct nc_widget_button         *help_b;
  90                 struct nc_widget_button         *cancel_b;
  91         } widgets;
  92 };
  93
  94 static struct config_screen *config_screen_from_scr(struct nc_scr *scr)
  95 {
  96         struct config_screen *config_screen;
  97
  98         assert(scr->sig == pb_config_screen_sig);
  99         config_screen = (struct config_screen *)
 100                 ((char *)scr - (size_t)&((struct config_screen *)0)->scr);
 101         assert(config_screen->scr.sig == pb_config_screen_sig);
 102         return config_screen;
 103 }
 104
 105 static void pad_refresh(struct config_screen *screen)
 106 {
 107         int y, x, rows, cols;
 108
 109         getmaxyx(screen->scr.sub_ncw, rows, cols);
 110         getbegyx(screen->scr.sub_ncw, y, x);
 111
 112         prefresh(screen->pad, screen->scroll_y, 0, y, x, rows, cols);
 113 }
 114
 115 static void config_screen_process_key(struct nc_scr *scr, int key)
 116 {
 117         struct config_screen *screen = config_screen_from_scr(scr);
 118         bool handled;
 119
 120         handled = widgetset_process_key(screen->widgetset, key);
 121         if (screen->exit) {
 122                 screen->on_exit(screen->cui);
 123
 124         } else if (screen->show_help || (!handled && key == 'h')) {
 125                 screen->show_help = false;
 126                 cui_show_help(screen->cui, "System Configuration",
 127                                 config_help_text);
 128
 129         } else if (handled) {
 130                 pad_refresh(screen);
 131         }
 132 }
 133
 134 static void config_screen_resize(struct nc_scr *scr)
 135 {
 136         struct config_screen *screen = config_screen_from_scr(scr);
 137         (void)screen;
 138 }
 139
 140 static int config_screen_post(struct nc_scr *scr)
 141 {
 142         struct config_screen *screen = config_screen_from_scr(scr);
 143         widgetset_post(screen->widgetset);
 144         nc_scr_frame_draw(scr);
 145         redrawwin(scr->main_ncw);
 146         wrefresh(screen->scr.main_ncw);
 147         pad_refresh(screen);
 148         return 0;
 149 }
 150
 151 static int config_screen_unpost(struct nc_scr *scr)
 152 {
 153         struct config_screen *screen = config_screen_from_scr(scr);
 154         widgetset_unpost(screen->widgetset);
 155         return 0;
 156 }
 157
 158 struct nc_scr *config_screen_scr(struct config_screen *screen)
 159 {
 160         return &screen->scr;
 161 }
 162
 163 static int screen_process_form(struct config_screen *screen)
 164 {
 165         const struct system_info *sysinfo = screen->cui->sysinfo;
 166         enum net_conf_type net_conf_type;
 167         struct interface_config *iface;
 168         struct config *config;
 169         char *str, *end;
 170         int rc;
 171
 172         config = config_copy(screen, screen->cui->config);
 173
 174         config->autoboot_enabled =
 175                 widget_checkbox_get_value(screen->widgets.autoboot_f);
 176
 177
 178         str = widget_textbox_get_value(screen->widgets.timeout_f);
 179         if (str) {
 180                 unsigned long x;
 181                 errno = 0;
 182                 x = strtoul(str, &end, 10);
 183                 if (!errno && end != str)
 184                         config->autoboot_timeout_sec = x;
 185         }
 186
 187         net_conf_type = widget_select_get_value(screen->widgets.network_f);
 188
 189         /* if we don't have any network interfaces, prevent per-interface
 190          * configuration */
 191         if (sysinfo->n_interfaces == 0)
 192                 net_conf_type = NET_CONF_TYPE_DHCP_ALL;
 193
 194         if (net_conf_type == NET_CONF_TYPE_DHCP_ALL) {
 195                 config->network.n_interfaces = 0;
 196
 197         } else {
 198                 int idx;
 199
 200                 iface = talloc_zero(config, struct interface_config);
 201                 config->network.n_interfaces = 1;
 202                 config->network.interfaces = talloc_array(config,
 203                                 struct interface_config *, 1);
 204                 config->network.interfaces[0] = iface;
 205
 206                 /* copy hwaddr (from the sysinfo interface data) to
 207                  * the configuration */
 208                 idx = widget_select_get_value(screen->widgets.iface_f);
 209                 memcpy(iface->hwaddr, sysinfo->interfaces[idx]->hwaddr,
 210                                 sizeof(iface->hwaddr));
 211         }
 212
 213         if (net_conf_type == NET_CONF_TYPE_DHCP_ONE) {
 214                 iface->method = CONFIG_METHOD_DHCP;
 215         }
 216
 217         if (net_conf_type == NET_CONF_TYPE_STATIC) {
 218                 char *ip, *mask, *gateway;
 219
 220                 ip = widget_textbox_get_value(screen->widgets.ip_addr_f);
 221                 mask = widget_textbox_get_value(screen->widgets.ip_mask_f);
 222                 gateway = widget_textbox_get_value(screen->widgets.gateway_f);
 223
 224                 if (!ip || !*ip || !mask || !*mask) {
 225                         screen->scr.frame.status =
 226                                 "No IP / mask values are set";
 227                         nc_scr_frame_draw(&screen->scr);
 228                         talloc_free(config);
 229                         return -1;
 230                 }
 231
 232                 iface->method = CONFIG_METHOD_STATIC;
 233                 iface->static_config.address = talloc_asprintf(iface, "%s/%s",
 234                                 ip, mask);
 235                 iface->static_config.gateway = talloc_strdup(iface, gateway);
 236         }
 237
 238         str = widget_textbox_get_value(screen->widgets.dns_f);
 239         if (str && strlen(str)) {
 240                 char *dns, *tmp;
 241                 int i;
 242
 243                 for (;;) {
 244                         dns = strtok_r(str, " \t", &tmp);
 245
 246                         if (!dns)
 247                                 break;
 248
 249                         i = config->network.n_dns_servers++;
 250                         config->network.dns_servers = talloc_realloc(config,
 251                                         config->network.dns_servers,
 252                                         const char *,
 253                                         config->network.n_dns_servers);
 254                         config->network.dns_servers[i] =
 255                                 talloc_strdup(config, dns);
 256
 257                         str = NULL;
 258                 }
 259         }
 260
 261         rc = cui_send_config(screen->cui, config);
 262         talloc_free(config);
 263
 264         if (rc)
 265                 pb_log("cui_send_config failed!\n");
 266         else
 267                 pb_debug("config sent!\n");
 268
 269         return 0;
 270 }
 271
 272 static void ok_click(void *arg)
 273 {
 274         struct config_screen *screen = arg;
 275         if (screen_process_form(screen))
 276                 /* errors are written to the status line, so we'll need
 277                  * to refresh */
 278                 wrefresh(screen->scr.main_ncw);
 279         else
 280                 screen->exit = true;
 281 }
 282
 283 static void help_click(void *arg)
 284 {
 285         struct config_screen *screen = arg;
 286         screen->show_help = true;
 287 }
 288
 289 static void cancel_click(void *arg)
 290 {
 291         struct config_screen *screen = arg;
 292         screen->exit = true;
 293 }
 294
 295 static int layout_pair(struct config_screen *screen, int y,
 296                 struct nc_widget_label *label,
 297                 struct nc_widget *field)
 298 {
 299         struct nc_widget *label_w = widget_label_base(label);
 300         widget_move(label_w, y, screen->label_x);
 301         widget_move(field, y, screen->field_x);
 302         return max(widget_height(label_w), widget_height(field));
 303 }
 304
 305 static void config_screen_layout_widgets(struct config_screen *screen,
 306                 enum net_conf_type net_conf)
 307 {
 308         struct nc_widget *wl, *wf, *wh;
 309         int y, x, help_x;
 310         bool show;
 311
 312         y = 1;
 313         help_x = screen->field_x + 2 +
 314                 widget_width(widget_textbox_base(screen->widgets.dns_f));
 315
 316         y += layout_pair(screen, y, screen->widgets.autoboot_l,
 317                         widget_checkbox_base(screen->widgets.autoboot_f));
 318
 319         wf = widget_textbox_base(screen->widgets.timeout_f);
 320         widget_move(widget_label_base(screen->widgets.timeout_l),
 321                         y, screen->label_x);
 322         widget_move(wf, y, screen->field_x);
 323         widget_move(widget_label_base(screen->widgets.timeout_help_l),
 324                         y, screen->field_x + widget_width(wf) + 1);
 325
 326         y += 2;
 327
 328         y += layout_pair(screen, y, screen->widgets.network_l,
 329                         widget_select_base(screen->widgets.network_f));
 330
 331         y += 1;
 332
 333         /* conditionally show iface select */
 334         wl = widget_label_base(screen->widgets.iface_l);
 335         wf = widget_select_base(screen->widgets.iface_f);
 336
 337         show = net_conf == NET_CONF_TYPE_DHCP_ONE ||
 338                 net_conf == NET_CONF_TYPE_STATIC;
 339
 340         widget_set_visible(wl, show);
 341         widget_set_visible(wf, show);
 342
 343         if (show)
 344                 y += layout_pair(screen, y, screen->widgets.iface_l, wf) + 1;
 345
 346         /* conditionally show static IP params */
 347         show = net_conf == NET_CONF_TYPE_STATIC;
 348
 349         wl = widget_label_base(screen->widgets.ip_addr_l);
 350         wf = widget_textbox_base(screen->widgets.ip_addr_f);
 351         widget_set_visible(wl, show);
 352         widget_set_visible(wf, show);
 353         x = screen->field_x + widget_width(wf) + 1;
 354
 355         if (show)
 356                 layout_pair(screen, y, screen->widgets.ip_addr_l, wf);
 357
 358         wl = widget_label_base(screen->widgets.ip_mask_l);
 359         wf = widget_textbox_base(screen->widgets.ip_mask_f);
 360         widget_set_visible(wl, show);
 361         widget_set_visible(wf, show);
 362
 363         if (show) {
 364                 widget_move(wl, y, x);
 365                 widget_move(wf, y, x + 2);
 366         }
 367
 368         /* help for IP/mask */
 369         wh = widget_label_base(screen->widgets.ip_addr_mask_help_l);
 370         widget_set_visible(wh, show);
 371         if (show) {
 372                 widget_move(wh, y, help_x);
 373                 y++;
 374         }
 375
 376         wl = widget_label_base(screen->widgets.gateway_l);
 377         wf = widget_textbox_base(screen->widgets.gateway_f);
 378         wh = widget_label_base(screen->widgets.gateway_help_l);
 379         widget_set_visible(wl, show);
 380         widget_set_visible(wf, show);
 381         widget_set_visible(wh, show);
 382
 383         if (show) {
 384                 layout_pair(screen, y, screen->widgets.gateway_l, wf);
 385                 widget_move(wh, y, help_x);
 386                 y++;
 387         }
 388
 389         wh = widget_label_base(screen->widgets.dns_help_l);
 390         layout_pair(screen, y, screen->widgets.dns_l,
 391                         widget_textbox_base(screen->widgets.dns_f));
 392         widget_move(wh, y, help_x);
 393         y++;
 394
 395         /* we show the DNS/DHCP help if we're configuring DHCP */
 396         show = net_conf != NET_CONF_TYPE_STATIC;
 397         wl = widget_label_base(screen->widgets.dns_dhcp_help_l);
 398         widget_set_visible(wl, show);
 399         if (show) {
 400                 widget_move(wl, y, screen->field_x);
 401                 y += 1;
 402         }
 403
 404         y += 1;
 405
 406         widget_move(widget_button_base(screen->widgets.ok_b),
 407                         y, screen->field_x);
 408         widget_move(widget_button_base(screen->widgets.help_b),
 409                         y, screen->field_x + 10);
 410         widget_move(widget_button_base(screen->widgets.cancel_b),
 411                         y, screen->field_x + 20);
 412 }
 413
 414 static void config_screen_network_change(void *arg, int value)
 415 {
 416         struct config_screen *screen = arg;
 417         screen->net_conf_type = value;
 418         widgetset_unpost(screen->widgetset);
 419         config_screen_layout_widgets(screen, value);
 420         widgetset_post(screen->widgetset);
 421 }
 422
 423 static struct interface_config *first_active_interface(
 424                 const struct config *config)
 425 {
 426         unsigned int i;
 427
 428         for (i = 0; i < config->network.n_interfaces; i++) {
 429                 if (config->network.interfaces[i]->ignore)
 430                         continue;
 431                 return config->network.interfaces[i];
 432         }
 433         return NULL;
 434 }
 435
 436 static enum net_conf_type find_net_conf_type(const struct config *config)
 437 {
 438         struct interface_config *ifcfg;
 439
 440         ifcfg = first_active_interface(config);
 441
 442         if (!ifcfg)
 443                 return NET_CONF_TYPE_DHCP_ALL;
 444
 445         else if (ifcfg->method == CONFIG_METHOD_DHCP)
 446                 return NET_CONF_TYPE_DHCP_ONE;
 447
 448         else if (ifcfg->method == CONFIG_METHOD_STATIC)
 449                 return NET_CONF_TYPE_STATIC;
 450
 451         assert(0);
 452         return NET_CONF_TYPE_DHCP_ALL;
 453 }
 454
 455 static void config_screen_setup_empty(struct config_screen *screen)
 456 {
 457         widget_new_label(screen->widgetset, 2, screen->field_x,
 458                         "Waiting for configuration data...");
 459         screen->widgets.cancel_b = widget_new_button(screen->widgetset,
 460                         4, screen->field_x, 6, "Cancel", cancel_click, screen);
 461 }
 462
 463
 464 static void config_screen_setup_widgets(struct config_screen *screen,
 465                 const struct config *config,
 466                 const struct system_info *sysinfo)
 467 {
 468         struct nc_widgetset *set = screen->widgetset;
 469         struct interface_config *ifcfg;
 470         char *str, *ip, *mask, *gw;
 471         enum net_conf_type type;
 472         unsigned int i;
 473
 474         build_assert(sizeof(screen->widgets) / sizeof(struct widget *)
 475                         == N_FIELDS);
 476
 477         type = screen->net_conf_type;
 478         ifcfg = first_active_interface(config);
 479
 480         screen->widgets.autoboot_l = widget_new_label(set, 0, 0, "Autoboot:");
 481         screen->widgets.autoboot_f = widget_new_checkbox(set, 0, 0,
 482                                         config->autoboot_enabled);
 483
 484         str = talloc_asprintf(screen, "%d", config->autoboot_timeout_sec);
 485         screen->widgets.timeout_l = widget_new_label(set, 0, 0, "Timeout:");
 486         screen->widgets.timeout_f = widget_new_textbox(set, 0, 0, 5, str);
 487         screen->widgets.timeout_help_l = widget_new_label(set, 0, 0, "seconds");
 488
 489         widget_textbox_set_validator_integer(screen->widgets.timeout_f, 0, 999);
 490
 491         screen->widgets.network_l = widget_new_label(set, 0, 0, "Network");
 492         screen->widgets.network_f = widget_new_select(set, 0, 0, 50);
 493
 494         widget_select_add_option(screen->widgets.network_f,
 495                                         NET_CONF_TYPE_DHCP_ALL,
 496                                         "DHCP on all active interfaces",
 497                                         type == NET_CONF_TYPE_DHCP_ALL);
 498         widget_select_add_option(screen->widgets.network_f,
 499                                         NET_CONF_TYPE_DHCP_ONE,
 500                                         "DHCP on a specific interface",
 501                                         type == NET_CONF_TYPE_DHCP_ONE);
 502         widget_select_add_option(screen->widgets.network_f,
 503                                         NET_CONF_TYPE_STATIC,
 504                                         "Static IP configuration",
 505                                         type == NET_CONF_TYPE_STATIC);
 506
 507         widget_select_on_change(screen->widgets.network_f,
 508                         config_screen_network_change, screen);
 509
 510         screen->widgets.iface_l = widget_new_label(set, 0, 0, "Device:");
 511         screen->widgets.iface_f = widget_new_select(set, 0, 0, 50);
 512
 513         for (i = 0; i < sysinfo->n_interfaces; i++) {
 514                 struct interface_info *info = sysinfo->interfaces[i];
 515                 char str[50], mac[20];
 516                 bool is_default;
 517
 518                 is_default = ifcfg && !memcmp(ifcfg->hwaddr, info->hwaddr,
 519                                         sizeof(ifcfg->hwaddr));
 520
 521                 mac_str(info->hwaddr, info->hwaddr_size, mac, sizeof(mac));
 522                 snprintf(str, sizeof(str), "%s [%s, %s]", info->name, mac,
 523                                 info->link ? "link up" : "link down");
 524
 525                 widget_select_add_option(screen->widgets.iface_f,
 526                                                 i, str, is_default);
 527         }
 528
 529         gw = ip = mask = NULL;
 530         if (ifcfg && ifcfg->method == CONFIG_METHOD_STATIC) {
 531                 char *sep;
 532
 533                 str = talloc_strdup(screen, ifcfg->static_config.address);
 534                 sep = strchr(str, '/');
 535                 ip = str;
 536
 537                 if (sep) {
 538                         *sep = '\0';
 539                         mask = sep + 1;
 540                 }
 541                 gw = ifcfg->static_config.gateway;
 542         }
 543
 544         screen->widgets.ip_addr_l = widget_new_label(set, 0, 0, "IP/mask:");
 545         screen->widgets.ip_addr_f = widget_new_textbox(set, 0, 0, 16, ip);
 546         screen->widgets.ip_mask_l = widget_new_label(set, 0, 0, "/");
 547         screen->widgets.ip_mask_f = widget_new_textbox(set, 0, 0, 4, mask);
 548         screen->widgets.ip_addr_mask_help_l =
 549                 widget_new_label(set, 0, 0, "(eg. 192.168.0.10 / 24)");
 550
 551         widget_textbox_set_validator_ipv4(screen->widgets.ip_addr_f);
 552         widget_textbox_set_validator_integer(screen->widgets.ip_mask_f, 1, 31);
 553
 554         screen->widgets.gateway_l = widget_new_label(set, 0, 0, "Gateway:");
 555         screen->widgets.gateway_f = widget_new_textbox(set, 0, 0, 16, gw);
 556         screen->widgets.gateway_help_l =
 557                 widget_new_label(set, 0, 0, "(eg. 192.168.0.1)");
 558
 559         widget_textbox_set_validator_ipv4(screen->widgets.gateway_f);
 560
 561         str = talloc_strdup(screen, "");
 562         for (i = 0; i < config->network.n_dns_servers; i++) {
 563                 str = talloc_asprintf_append(str, "%s%s",
 564                                 (i == 0) ? "" : " ",
 565                                 config->network.dns_servers[i]);
 566         }
 567
 568         screen->widgets.dns_l = widget_new_label(set, 0, 0, "DNS Server(s):");
 569         screen->widgets.dns_f = widget_new_textbox(set, 0, 0, 32, str);
 570         screen->widgets.dns_help_l =
 571                 widget_new_label(set, 0, 0, "(eg. 192.168.0.2)");
 572
 573         widget_textbox_set_validator_ipv4_multi(screen->widgets.dns_f);
 574
 575         screen->widgets.dns_dhcp_help_l = widget_new_label(set, 0, 0,
 576                         "(if not provided by DHCP server)");
 577
 578         screen->widgets.ok_b = widget_new_button(set, 0, 0, 6, "OK",
 579                         ok_click, screen);
 580         screen->widgets.help_b = widget_new_button(set, 0, 0, 6, "Help",
 581                         help_click, screen);
 582         screen->widgets.cancel_b = widget_new_button(set, 0, 0, 6, "Cancel",
 583                         cancel_click, screen);
 584 }
 585
 586 static void config_screen_widget_focus(struct nc_widget *widget, void *arg)
 587 {
 588         struct config_screen *screen = arg;
 589         int w_y, s_max;
 590
 591         w_y = widget_y(widget) + widget_focus_y(widget);
 592         s_max = getmaxy(screen->scr.sub_ncw) - 1;
 593
 594         if (w_y < screen->scroll_y)
 595                 screen->scroll_y = w_y;
 596
 597         else if (w_y + screen->scroll_y + 1 > s_max)
 598                 screen->scroll_y = 1 + w_y - s_max;
 599
 600         else
 601                 return;
 602
 603         pad_refresh(screen);
 604 }
 605
 606 static void config_screen_draw(struct config_screen *screen,
 607                 const struct config *config,
 608                 const struct system_info *sysinfo)
 609 {
 610         bool repost = false;
 611         int height;
 612
 613         /* The size of the pad we'll need depends on the number of interfaces.
 614          *
 615          * We use N_FIELDS (which is quite conservative, as some fields share
 616          * a line) as a base, then add 3 (as the network select field is
 617          * takes 3 lines), and n_interfaces (as the network interface field
 618          * has n_interfaces lines).
 619          */
 620         height = N_FIELDS + 3;
 621         if (sysinfo)
 622                 height += sysinfo->n_interfaces;
 623         if (!screen->pad || getmaxy(screen->pad) < height) {
 624                 if (screen->pad)
 625                         delwin(screen->pad);
 626                 screen->pad = newpad(height, COLS);
 627         }
 628
 629         if (screen->widgetset) {
 630                 widgetset_unpost(screen->widgetset);
 631                 talloc_free(screen->widgetset);
 632                 repost = true;
 633         }
 634
 635         screen->widgetset = widgetset_create(screen, screen->scr.main_ncw,
 636                         screen->pad);
 637         widgetset_set_widget_focus(screen->widgetset,
 638                         config_screen_widget_focus, screen);
 639
 640         if (!config || !sysinfo) {
 641                 config_screen_setup_empty(screen);
 642         } else {
 643                 screen->net_conf_type = find_net_conf_type(config);
 644
 645                 config_screen_setup_widgets(screen, config, sysinfo);
 646                 config_screen_layout_widgets(screen, screen->net_conf_type);
 647         }
 648
 649         if (repost)
 650                 widgetset_post(screen->widgetset);
 651 }
 652
 653 void config_screen_update(struct config_screen *screen,
 654                 const struct config *config,
 655                 const struct system_info *sysinfo)
 656 {
 657         config_screen_draw(screen, config, sysinfo);
 658         pad_refresh(screen);
 659 }
 660
 661 static int config_screen_destroy(void *arg)
 662 {
 663         struct config_screen *screen = arg;
 664         if (screen->pad)
 665                 delwin(screen->pad);
 666         return 0;
 667 }
 668
 669 struct config_screen *config_screen_init(struct cui *cui,
 670                 const struct config *config,
 671                 const struct system_info *sysinfo,
 672                 void (*on_exit)(struct cui *))
 673 {
 674         struct config_screen *screen;
 675
 676         screen = talloc_zero(cui, struct config_screen);
 677         talloc_set_destructor(screen, config_screen_destroy);
 678         nc_scr_init(&screen->scr, pb_config_screen_sig, 0,
 679                         cui, config_screen_process_key,
 680                         config_screen_post, config_screen_unpost,
 681                         config_screen_resize);
 682
 683         screen->cui = cui;
 684         screen->on_exit = on_exit;
 685         screen->label_x = 2;
 686         screen->field_x = 17;
 687
 688         screen->scr.frame.ltitle = talloc_strdup(screen,
 689                         "Petitboot System Configuration");
 690         screen->scr.frame.rtitle = NULL;
 691         screen->scr.frame.help = talloc_strdup(screen,
 692                         "tab=next, shift+tab=previous");
 693         nc_scr_frame_draw(&screen->scr);
 694
 695         scrollok(screen->scr.sub_ncw, true);
 696
 697         config_screen_draw(screen, config, sysinfo);
 698
 699         return screen;
 700 }