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