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         struct config *config = talloc_zero(screen, struct config);
 154         enum net_conf_type net_conf_type;
 155         struct interface_config *iface;
 156         char *str, *end;
 157         int rc;
 158
 159         config_set_defaults(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                         return -1;
 216                 }
 217
 218                 iface->method = CONFIG_METHOD_STATIC;
 219                 iface->static_config.address = talloc_asprintf(iface, "%s/%s",
 220                                 ip, mask);
 221                 iface->static_config.gateway = talloc_strdup(iface, gateway);
 222         }
 223
 224         str = widget_textbox_get_value(screen->widgets.dns_f);
 225         if (str && strlen(str)) {
 226                 char *dns, *tmp;
 227                 int i;
 228
 229                 for (;;) {
 230                         dns = strtok_r(str, " \t", &tmp);
 231
 232                         if (!dns)
 233                                 break;
 234
 235                         i = config->network.n_dns_servers++;
 236                         config->network.dns_servers = talloc_realloc(config,
 237                                         config->network.dns_servers,
 238                                         const char *,
 239                                         config->network.n_dns_servers);
 240                         config->network.dns_servers[i] =
 241                                 talloc_strdup(config, dns);
 242
 243                         str = NULL;
 244                 }
 245         }
 246
 247         rc = cui_send_config(screen->cui, config);
 248         talloc_free(config);
 249
 250         if (rc)
 251                 pb_log("cui_send_config failed!\n");
 252         else
 253                 pb_debug("config sent!\n");
 254
 255         return 0;
 256 }
 257
 258 static void ok_click(void *arg)
 259 {
 260         struct config_screen *screen = arg;
 261         if (screen_process_form(screen))
 262                 /* errors are written to the status line, so we'll need
 263                  * to refresh */
 264                 wrefresh(screen->scr.main_ncw);
 265         else
 266                 screen->exit = true;
 267 }
 268
 269 static void cancel_click(void *arg)
 270 {
 271         struct config_screen *screen = arg;
 272         screen->exit = true;
 273 }
 274
 275 static int layout_pair(struct config_screen *screen, int y,
 276                 struct nc_widget_label *label,
 277                 struct nc_widget *field)
 278 {
 279         struct nc_widget *label_w = widget_label_base(label);
 280         widget_move(label_w, y, screen->label_x);
 281         widget_move(field, y, screen->field_x);
 282         return max(widget_height(label_w), widget_height(field));
 283 }
 284
 285 static void config_screen_layout_widgets(struct config_screen *screen,
 286                 enum net_conf_type net_conf)
 287 {
 288         struct nc_widget *wl, *wf, *wh;
 289         int y, x, help_x;
 290         bool show;
 291
 292         y = 1;
 293         help_x = screen->field_x + 2 +
 294                 widget_width(widget_textbox_base(screen->widgets.dns_f));
 295
 296         y += layout_pair(screen, y, screen->widgets.autoboot_l,
 297                         widget_checkbox_base(screen->widgets.autoboot_f));
 298
 299         wf = widget_textbox_base(screen->widgets.timeout_f);
 300         widget_move(widget_label_base(screen->widgets.timeout_l),
 301                         y, screen->label_x);
 302         widget_move(wf, y, screen->field_x);
 303         widget_move(widget_label_base(screen->widgets.timeout_help_l),
 304                         y, screen->field_x + widget_width(wf) + 1);
 305
 306         y += 2;
 307
 308         y += layout_pair(screen, y, screen->widgets.network_l,
 309                         widget_select_base(screen->widgets.network_f));
 310
 311         y += 1;
 312
 313         /* conditionally show iface select */
 314         wl = widget_label_base(screen->widgets.iface_l);
 315         wf = widget_select_base(screen->widgets.iface_f);
 316
 317         show = net_conf == NET_CONF_TYPE_DHCP_ONE ||
 318                 net_conf == NET_CONF_TYPE_STATIC;
 319
 320         widget_set_visible(wl, show);
 321         widget_set_visible(wf, show);
 322
 323         if (show)
 324                 y += layout_pair(screen, y, screen->widgets.iface_l, wf) + 1;
 325
 326         /* conditionally show static IP params */
 327         show = net_conf == NET_CONF_TYPE_STATIC;
 328
 329         wl = widget_label_base(screen->widgets.ip_addr_l);
 330         wf = widget_textbox_base(screen->widgets.ip_addr_f);
 331         widget_set_visible(wl, show);
 332         widget_set_visible(wf, show);
 333         x = screen->field_x + widget_width(wf) + 1;
 334
 335         if (show)
 336                 layout_pair(screen, y, screen->widgets.ip_addr_l, wf);
 337
 338         wl = widget_label_base(screen->widgets.ip_mask_l);
 339         wf = widget_textbox_base(screen->widgets.ip_mask_f);
 340         widget_set_visible(wl, show);
 341         widget_set_visible(wf, show);
 342
 343         if (show) {
 344                 widget_move(wl, y, x);
 345                 widget_move(wf, y, x + 2);
 346         }
 347
 348         /* help for IP/mask */
 349         wh = widget_label_base(screen->widgets.ip_addr_mask_help_l);
 350         widget_set_visible(wh, show);
 351         if (show) {
 352                 widget_move(wh, y, help_x);
 353                 y++;
 354         }
 355
 356         wl = widget_label_base(screen->widgets.gateway_l);
 357         wf = widget_textbox_base(screen->widgets.gateway_f);
 358         wh = widget_label_base(screen->widgets.gateway_help_l);
 359         widget_set_visible(wl, show);
 360         widget_set_visible(wf, show);
 361         widget_set_visible(wh, show);
 362
 363         if (show) {
 364                 layout_pair(screen, y, screen->widgets.gateway_l, wf);
 365                 widget_move(wh, y, help_x);
 366                 y++;
 367         }
 368
 369         wh = widget_label_base(screen->widgets.dns_help_l);
 370         layout_pair(screen, y, screen->widgets.dns_l,
 371                         widget_textbox_base(screen->widgets.dns_f));
 372         widget_move(wh, y, help_x);
 373         y++;
 374
 375         /* we show the DNS/DHCP help if we're configuring DHCP */
 376         show = net_conf != NET_CONF_TYPE_STATIC;
 377         wl = widget_label_base(screen->widgets.dns_dhcp_help_l);
 378         widget_set_visible(wl, show);
 379         if (show) {
 380                 widget_move(wl, y, screen->field_x);
 381                 y += 1;
 382         }
 383
 384         y += 1;
 385
 386         widget_move(widget_button_base(screen->widgets.ok_b),
 387                         y, screen->field_x);
 388         widget_move(widget_button_base(screen->widgets.cancel_b),
 389                         y, screen->field_x + 10);
 390 }
 391
 392 static void config_screen_network_change(void *arg, int value)
 393 {
 394         struct config_screen *screen = arg;
 395         screen->net_conf_type = value;
 396         widgetset_unpost(screen->widgetset);
 397         config_screen_layout_widgets(screen, value);
 398         widgetset_post(screen->widgetset);
 399 }
 400
 401 static struct interface_config *first_active_interface(
 402                 const struct config *config)
 403 {
 404         unsigned int i;
 405
 406         for (i = 0; i < config->network.n_interfaces; i++) {
 407                 if (config->network.interfaces[i]->ignore)
 408                         continue;
 409                 return config->network.interfaces[i];
 410         }
 411         return NULL;
 412 }
 413
 414 static enum net_conf_type find_net_conf_type(const struct config *config)
 415 {
 416         struct interface_config *ifcfg;
 417
 418         ifcfg = first_active_interface(config);
 419
 420         if (!ifcfg)
 421                 return NET_CONF_TYPE_DHCP_ALL;
 422
 423         else if (ifcfg->method == CONFIG_METHOD_DHCP)
 424                 return NET_CONF_TYPE_DHCP_ONE;
 425
 426         else if (ifcfg->method == CONFIG_METHOD_STATIC)
 427                 return NET_CONF_TYPE_STATIC;
 428
 429         assert(0);
 430         return NET_CONF_TYPE_DHCP_ALL;
 431 }
 432
 433 static void config_screen_setup_empty(struct config_screen *screen)
 434 {
 435         widget_new_label(screen->widgetset, 2, screen->field_x,
 436                         "Waiting for configuration data...");
 437         screen->widgets.cancel_b = widget_new_button(screen->widgetset,
 438                         4, screen->field_x, 6, "Cancel", cancel_click, screen);
 439 }
 440
 441
 442 static void config_screen_setup_widgets(struct config_screen *screen,
 443                 const struct config *config,
 444                 const struct system_info *sysinfo)
 445 {
 446         struct nc_widgetset *set = screen->widgetset;
 447         struct interface_config *ifcfg;
 448         char *str, *ip, *mask, *gw;
 449         enum net_conf_type type;
 450         unsigned int i;
 451
 452         build_assert(sizeof(screen->widgets) / sizeof(struct widget *)
 453                         == N_FIELDS);
 454
 455         type = screen->net_conf_type;
 456         ifcfg = first_active_interface(config);
 457
 458         screen->widgets.autoboot_l = widget_new_label(set, 0, 0, "Autoboot:");
 459         screen->widgets.autoboot_f = widget_new_checkbox(set, 0, 0,
 460                                         config->autoboot_enabled);
 461
 462         str = talloc_asprintf(screen, "%d", config->autoboot_timeout_sec);
 463         screen->widgets.timeout_l = widget_new_label(set, 0, 0, "Timeout:");
 464         screen->widgets.timeout_f = widget_new_textbox(set, 0, 0, 5, str);
 465         screen->widgets.timeout_help_l = widget_new_label(set, 0, 0, "seconds");
 466
 467         widget_textbox_set_validator_integer(screen->widgets.timeout_f, 0, 999);
 468
 469         screen->widgets.network_l = widget_new_label(set, 0, 0, "Network");
 470         screen->widgets.network_f = widget_new_select(set, 0, 0, 50);
 471
 472         widget_select_add_option(screen->widgets.network_f,
 473                                         NET_CONF_TYPE_DHCP_ALL,
 474                                         "DHCP on all active interfaces",
 475                                         type == NET_CONF_TYPE_DHCP_ALL);
 476         widget_select_add_option(screen->widgets.network_f,
 477                                         NET_CONF_TYPE_DHCP_ONE,
 478                                         "DHCP on a specific interface",
 479                                         type == NET_CONF_TYPE_DHCP_ONE);
 480         widget_select_add_option(screen->widgets.network_f,
 481                                         NET_CONF_TYPE_STATIC,
 482                                         "Static IP configuration",
 483                                         type == NET_CONF_TYPE_STATIC);
 484
 485         widget_select_on_change(screen->widgets.network_f,
 486                         config_screen_network_change, screen);
 487
 488         screen->widgets.iface_l = widget_new_label(set, 0, 0, "Device:");
 489         screen->widgets.iface_f = widget_new_select(set, 0, 0, 50);
 490
 491         for (i = 0; i < sysinfo->n_interfaces; i++) {
 492                 struct interface_info *info = sysinfo->interfaces[i];
 493                 char str[50], mac[20];
 494                 bool is_default;
 495
 496                 is_default = ifcfg && !memcmp(ifcfg->hwaddr, info->hwaddr,
 497                                         sizeof(ifcfg->hwaddr));
 498
 499                 mac_str(info->hwaddr, info->hwaddr_size, mac, sizeof(mac));
 500                 snprintf(str, sizeof(str), "%s [%s, %s]", info->name, mac,
 501                                 info->link ? "link up" : "link down");
 502
 503                 widget_select_add_option(screen->widgets.iface_f,
 504                                                 i, str, is_default);
 505         }
 506
 507         gw = ip = mask = NULL;
 508         if (ifcfg && ifcfg->method == CONFIG_METHOD_STATIC) {
 509                 char *sep;
 510
 511                 str = talloc_strdup(screen, ifcfg->static_config.address);
 512                 sep = strchr(str, '/');
 513                 ip = str;
 514
 515                 if (sep) {
 516                         *sep = '\0';
 517                         mask = sep + 1;
 518                 }
 519                 gw = ifcfg->static_config.gateway;
 520         }
 521
 522         screen->widgets.ip_addr_l = widget_new_label(set, 0, 0, "IP/mask:");
 523         screen->widgets.ip_addr_f = widget_new_textbox(set, 0, 0, 16, ip);
 524         screen->widgets.ip_mask_l = widget_new_label(set, 0, 0, "/");
 525         screen->widgets.ip_mask_f = widget_new_textbox(set, 0, 0, 4, mask);
 526         screen->widgets.ip_addr_mask_help_l =
 527                 widget_new_label(set, 0, 0, "(eg. 192.168.0.10 / 24)");
 528
 529         widget_textbox_set_validator_ipv4(screen->widgets.ip_addr_f);
 530         widget_textbox_set_validator_integer(screen->widgets.ip_mask_f, 1, 31);
 531
 532         screen->widgets.gateway_l = widget_new_label(set, 0, 0, "Gateway:");
 533         screen->widgets.gateway_f = widget_new_textbox(set, 0, 0, 16, gw);
 534         screen->widgets.gateway_help_l =
 535                 widget_new_label(set, 0, 0, "(eg. 192.168.0.1)");
 536
 537         widget_textbox_set_validator_ipv4(screen->widgets.gateway_f);
 538
 539         str = talloc_strdup(screen, "");
 540         for (i = 0; i < config->network.n_dns_servers; i++) {
 541                 str = talloc_asprintf_append(str, "%s%s",
 542                                 (i == 0) ? "" : " ",
 543                                 config->network.dns_servers[i]);
 544         }
 545
 546         screen->widgets.dns_l = widget_new_label(set, 0, 0, "DNS Server(s):");
 547         screen->widgets.dns_f = widget_new_textbox(set, 0, 0, 32, str);
 548         screen->widgets.dns_help_l =
 549                 widget_new_label(set, 0, 0, "(eg. 192.168.0.2)");
 550
 551         widget_textbox_set_validator_ipv4_multi(screen->widgets.dns_f);
 552
 553         screen->widgets.dns_dhcp_help_l = widget_new_label(set, 0, 0,
 554                         "(if not provided by DHCP server)");
 555
 556         screen->widgets.ok_b = widget_new_button(set, 0, 0, 6, "OK",
 557                         ok_click, screen);
 558         screen->widgets.cancel_b = widget_new_button(set, 0, 0, 6, "Cancel",
 559                         cancel_click, screen);
 560 }
 561
 562 static void config_screen_widget_focus(struct nc_widget *widget, void *arg)
 563 {
 564         struct config_screen *screen = arg;
 565         int w_y, s_max;
 566
 567         w_y = widget_y(widget) + widget_focus_y(widget);
 568         s_max = getmaxy(screen->scr.sub_ncw) - 1;
 569
 570         if (w_y < screen->scroll_y)
 571                 screen->scroll_y = w_y;
 572
 573         else if (w_y + screen->scroll_y + 1 > s_max)
 574                 screen->scroll_y = 1 + w_y - s_max;
 575
 576         else
 577                 return;
 578
 579         pad_refresh(screen);
 580 }
 581
 582
 583 void config_screen_update(struct config_screen *screen,
 584                 const struct config *config,
 585                 const struct system_info *sysinfo)
 586 {
 587         bool repost = false;
 588         int height;
 589
 590         /* The size of the pad we'll need depends on the number of interfaces.
 591          *
 592          * We use N_FIELDS (which is quite conservative, as some fields share
 593          * a line) as a base, then add 3 (as the network select field is
 594          * takes 3 lines), and n_interfaces (as the network interface field
 595          * has n_interfaces lines).
 596          */
 597         height = N_FIELDS + 3;
 598         if (sysinfo)
 599                 height += sysinfo->n_interfaces;
 600         if (!screen->pad || getmaxy(screen->pad) < height) {
 601                 if (screen->pad)
 602                         delwin(screen->pad);
 603                 screen->pad = newpad(height, COLS);
 604         }
 605
 606         if (screen->widgetset) {
 607                 widgetset_unpost(screen->widgetset);
 608                 talloc_free(screen->widgetset);
 609                 repost = true;
 610         }
 611
 612         screen->widgetset = widgetset_create(screen, screen->scr.main_ncw,
 613                         screen->pad);
 614         widgetset_set_widget_focus(screen->widgetset,
 615                         config_screen_widget_focus, screen);
 616
 617         if (!config || !sysinfo) {
 618                 config_screen_setup_empty(screen);
 619         } else {
 620                 screen->net_conf_type = find_net_conf_type(config);
 621
 622                 config_screen_setup_widgets(screen, config, sysinfo);
 623                 config_screen_layout_widgets(screen, screen->net_conf_type);
 624         }
 625
 626         if (repost)
 627                 widgetset_post(screen->widgetset);
 628
 629         pad_refresh(screen);
 630 }
 631
 632 static int config_screen_destroy(void *arg)
 633 {
 634         struct config_screen *screen = arg;
 635         if (screen->pad)
 636                 delwin(screen->pad);
 637         return 0;
 638 }
 639
 640 struct config_screen *config_screen_init(struct cui *cui,
 641                 const struct config *config,
 642                 const struct system_info *sysinfo,
 643                 void (*on_exit)(struct cui *))
 644 {
 645         struct config_screen *screen;
 646
 647         screen = talloc_zero(cui, struct config_screen);
 648         talloc_set_destructor(screen, config_screen_destroy);
 649         nc_scr_init(&screen->scr, pb_config_screen_sig, 0,
 650                         cui, config_screen_process_key,
 651                         config_screen_post, config_screen_unpost,
 652                         config_screen_resize);
 653
 654         screen->cui = cui;
 655         screen->on_exit = on_exit;
 656         screen->label_x = 2;
 657         screen->field_x = 17;
 658
 659         screen->scr.frame.ltitle = talloc_strdup(screen,
 660                         "Petitboot System Configuration");
 661         screen->scr.frame.rtitle = NULL;
 662         screen->scr.frame.help = talloc_strdup(screen,
 663                         "tab=next, shift+tab=previous");
 664         nc_scr_frame_draw(&screen->scr);
 665
 666         scrollok(screen->scr.sub_ncw, true);
 667
 668         config_screen_update(screen, config, sysinfo);
 669
 670         wrefresh(screen->scr.main_ncw);
 671
 672         return screen;
 673 }