Fixed a PuTTYtel startup assertion failure introduced in r8305.

[u/mdw/putty] / config.c

/*
 * config.c - the platform-independent parts of the PuTTY
 * configuration box.
 */

#include <assert.h>
#include <stdlib.h>

#include "putty.h"
#include "dialog.h"
#include "storage.h"

#define PRINTER_DISABLED_STRING "None (printing disabled)"

#define HOST_BOX_TITLE "Host Name (or IP address)"
#define PORT_BOX_TITLE "Port"

static void config_host_handler(union control *ctrl, void *dlg,
                                void *data, int event)
{
    Config *cfg = (Config *)data;

    /*
     * This function works just like the standard edit box handler,
     * only it has to choose the control's label and text from two
     * different places depending on the protocol.
     */
    if (event == EVENT_REFRESH) {
        if (cfg->protocol == PROT_SERIAL) {
            /*
             * This label text is carefully chosen to contain an n,
             * since that's the shortcut for the host name control.
             */
            dlg_label_change(ctrl, dlg, "Serial line");
            dlg_editbox_set(ctrl, dlg, cfg->serline);
        } else {
            dlg_label_change(ctrl, dlg, HOST_BOX_TITLE);
            dlg_editbox_set(ctrl, dlg, cfg->host);
        }
    } else if (event == EVENT_VALCHANGE) {
        if (cfg->protocol == PROT_SERIAL)
            dlg_editbox_get(ctrl, dlg, cfg->serline, lenof(cfg->serline));
        else
            dlg_editbox_get(ctrl, dlg, cfg->host, lenof(cfg->host));
    }
}

static void config_port_handler(union control *ctrl, void *dlg,
                                void *data, int event)
{
    Config *cfg = (Config *)data;
    char buf[80];

    /*
     * This function works just like the standard edit box handler,
     * only it has to choose the control's label and text from two
     * different places depending on the protocol.
     */
    if (event == EVENT_REFRESH) {
        if (cfg->protocol == PROT_SERIAL) {
            /*
             * This label text is carefully chosen to contain a p,
             * since that's the shortcut for the port control.
             */
            dlg_label_change(ctrl, dlg, "Speed");
            sprintf(buf, "%d", cfg->serspeed);
        } else {
            dlg_label_change(ctrl, dlg, PORT_BOX_TITLE);
            sprintf(buf, "%d", cfg->port);
        }
        dlg_editbox_set(ctrl, dlg, buf);
    } else if (event == EVENT_VALCHANGE) {
        dlg_editbox_get(ctrl, dlg, buf, lenof(buf));
        if (cfg->protocol == PROT_SERIAL)
            cfg->serspeed = atoi(buf);
        else
            cfg->port = atoi(buf);
    }
}

struct hostport {
    union control *host, *port;
};

/*
 * We export this function so that platform-specific config
 * routines can use it to conveniently identify the protocol radio
 * buttons in order to add to them.
 */
void config_protocolbuttons_handler(union control *ctrl, void *dlg,
                                    void *data, int event)
{
    int button;
    Config *cfg = (Config *)data;
    struct hostport *hp = (struct hostport *)ctrl->radio.context.p;

    /*
     * This function works just like the standard radio-button
     * handler, except that it also has to change the setting of
     * the port box, and refresh both host and port boxes when. We
     * expect the context parameter to point at a hostport
     * structure giving the `union control's for both.
     */
    if (event == EVENT_REFRESH) {
        for (button = 0; button < ctrl->radio.nbuttons; button++)
            if (cfg->protocol == ctrl->radio.buttondata[button].i)
                break;
        /* We expected that `break' to happen, in all circumstances. */
        assert(button < ctrl->radio.nbuttons);
        dlg_radiobutton_set(ctrl, dlg, button);
    } else if (event == EVENT_VALCHANGE) {
        int oldproto = cfg->protocol;
        button = dlg_radiobutton_get(ctrl, dlg);
        assert(button >= 0 && button < ctrl->radio.nbuttons);
        cfg->protocol = ctrl->radio.buttondata[button].i;
        if (oldproto != cfg->protocol) {
            Backend *ob = backend_from_proto(oldproto);
            Backend *nb = backend_from_proto(cfg->protocol);
            assert(ob);
            assert(nb);
            /* Iff the user hasn't changed the port from the protocol
             * default (if any), update it with the new protocol's
             * default.
             * (XXX: this isn't perfect; a default can become permanent
             * by going via the serial backend. However, it helps with
             * the common case of tabbing through the controls in order
             * and setting a non-default port.) */
            if (cfg->port == ob->default_port &&
                cfg->port > 0 && nb->default_port > 0)
                cfg->port = nb->default_port;
        }
        dlg_refresh(hp->host, dlg);
        dlg_refresh(hp->port, dlg);
    }
}

static void loggingbuttons_handler(union control *ctrl, void *dlg,
                                   void *data, int event)
{
    int button;
    Config *cfg = (Config *)data;
    /* This function works just like the standard radio-button handler,
     * but it has to fall back to "no logging" in situations where the
     * configured logging type isn't applicable.
     */
    if (event == EVENT_REFRESH) {
        for (button = 0; button < ctrl->radio.nbuttons; button++)
            if (cfg->logtype == ctrl->radio.buttondata[button].i)
                break;
    
    /* We fell off the end, so we lack the configured logging type */
    if (button == ctrl->radio.nbuttons) {
        button=0;
        cfg->logtype=LGTYP_NONE;
    }
    dlg_radiobutton_set(ctrl, dlg, button);
    } else if (event == EVENT_VALCHANGE) {
        button = dlg_radiobutton_get(ctrl, dlg);
        assert(button >= 0 && button < ctrl->radio.nbuttons);
        cfg->logtype = ctrl->radio.buttondata[button].i;
    }
}

static void numeric_keypad_handler(union control *ctrl, void *dlg,
                                   void *data, int event)
{
    int button;
    Config *cfg = (Config *)data;
    /*
     * This function works much like the standard radio button
     * handler, but it has to handle two fields in Config.
     */
    if (event == EVENT_REFRESH) {
        if (cfg->nethack_keypad)
            button = 2;
        else if (cfg->app_keypad)
            button = 1;
        else
            button = 0;
        assert(button < ctrl->radio.nbuttons);
        dlg_radiobutton_set(ctrl, dlg, button);
    } else if (event == EVENT_VALCHANGE) {
        button = dlg_radiobutton_get(ctrl, dlg);
        assert(button >= 0 && button < ctrl->radio.nbuttons);
        if (button == 2) {
            cfg->app_keypad = FALSE;
            cfg->nethack_keypad = TRUE;
        } else {
            cfg->app_keypad = (button != 0);
            cfg->nethack_keypad = FALSE;
        }
    }
}

static void cipherlist_handler(union control *ctrl, void *dlg,
                               void *data, int event)
{
    Config *cfg = (Config *)data;
    if (event == EVENT_REFRESH) {
        int i;

        static const struct { char *s; int c; } ciphers[] = {
            { "3DES",                   CIPHER_3DES },
            { "Blowfish",               CIPHER_BLOWFISH },
            { "DES",                    CIPHER_DES },
            { "AES (SSH-2 only)",       CIPHER_AES },
            { "Arcfour (SSH-2 only)",   CIPHER_ARCFOUR },
            { "-- warn below here --",  CIPHER_WARN }
        };

        /* Set up the "selected ciphers" box. */
        /* (cipherlist assumed to contain all ciphers) */
        dlg_update_start(ctrl, dlg);
        dlg_listbox_clear(ctrl, dlg);
        for (i = 0; i < CIPHER_MAX; i++) {
            int c = cfg->ssh_cipherlist[i];
            int j;
            char *cstr = NULL;
            for (j = 0; j < (sizeof ciphers) / (sizeof ciphers[0]); j++) {
                if (ciphers[j].c == c) {
                    cstr = ciphers[j].s;
                    break;
                }
            }
            dlg_listbox_addwithid(ctrl, dlg, cstr, c);
        }
        dlg_update_done(ctrl, dlg);

    } else if (event == EVENT_VALCHANGE) {
        int i;

        /* Update array to match the list box. */
        for (i=0; i < CIPHER_MAX; i++)
            cfg->ssh_cipherlist[i] = dlg_listbox_getid(ctrl, dlg, i);

    }
}

static void kexlist_handler(union control *ctrl, void *dlg,
                            void *data, int event)
{
    Config *cfg = (Config *)data;
    if (event == EVENT_REFRESH) {
        int i;

        static const struct { char *s; int k; } kexes[] = {
            { "Diffie-Hellman group 1",         KEX_DHGROUP1 },
            { "Diffie-Hellman group 14",        KEX_DHGROUP14 },
            { "Diffie-Hellman group exchange",  KEX_DHGEX },
            { "RSA-based key exchange",         KEX_RSA },
            { "-- warn below here --",          KEX_WARN }
        };

        /* Set up the "kex preference" box. */
        /* (kexlist assumed to contain all algorithms) */
        dlg_update_start(ctrl, dlg);
        dlg_listbox_clear(ctrl, dlg);
        for (i = 0; i < KEX_MAX; i++) {
            int k = cfg->ssh_kexlist[i];
            int j;
            char *kstr = NULL;
            for (j = 0; j < (sizeof kexes) / (sizeof kexes[0]); j++) {
                if (kexes[j].k == k) {
                    kstr = kexes[j].s;
                    break;
                }
            }
            dlg_listbox_addwithid(ctrl, dlg, kstr, k);
        }
        dlg_update_done(ctrl, dlg);

    } else if (event == EVENT_VALCHANGE) {
        int i;

        /* Update array to match the list box. */
        for (i=0; i < KEX_MAX; i++)
            cfg->ssh_kexlist[i] = dlg_listbox_getid(ctrl, dlg, i);

    }
}

static void printerbox_handler(union control *ctrl, void *dlg,
                               void *data, int event)
{
    Config *cfg = (Config *)data;
    if (event == EVENT_REFRESH) {
        int nprinters, i;
        printer_enum *pe;

        dlg_update_start(ctrl, dlg);
        /*
         * Some backends may wish to disable the drop-down list on
         * this edit box. Be prepared for this.
         */
        if (ctrl->editbox.has_list) {
            dlg_listbox_clear(ctrl, dlg);
            dlg_listbox_add(ctrl, dlg, PRINTER_DISABLED_STRING);
            pe = printer_start_enum(&nprinters);
            for (i = 0; i < nprinters; i++)
                dlg_listbox_add(ctrl, dlg, printer_get_name(pe, i));
            printer_finish_enum(pe);
        }
        dlg_editbox_set(ctrl, dlg,
                        (*cfg->printer ? cfg->printer :
                         PRINTER_DISABLED_STRING));
        dlg_update_done(ctrl, dlg);
    } else if (event == EVENT_VALCHANGE) {
        dlg_editbox_get(ctrl, dlg, cfg->printer, sizeof(cfg->printer));
        if (!strcmp(cfg->printer, PRINTER_DISABLED_STRING))
            *cfg->printer = '\0';
    }
}

static void codepage_handler(union control *ctrl, void *dlg,
                             void *data, int event)
{
    Config *cfg = (Config *)data;
    if (event == EVENT_REFRESH) {
        int i;
        const char *cp;
        dlg_update_start(ctrl, dlg);
        strcpy(cfg->line_codepage,
               cp_name(decode_codepage(cfg->line_codepage)));
        dlg_listbox_clear(ctrl, dlg);
        for (i = 0; (cp = cp_enumerate(i)) != NULL; i++)
            dlg_listbox_add(ctrl, dlg, cp);
        dlg_editbox_set(ctrl, dlg, cfg->line_codepage);
        dlg_update_done(ctrl, dlg);
    } else if (event == EVENT_VALCHANGE) {
        dlg_editbox_get(ctrl, dlg, cfg->line_codepage,
                        sizeof(cfg->line_codepage));
        strcpy(cfg->line_codepage,
               cp_name(decode_codepage(cfg->line_codepage)));
    }
}

static void sshbug_handler(union control *ctrl, void *dlg,
                           void *data, int event)
{
    if (event == EVENT_REFRESH) {
        dlg_update_start(ctrl, dlg);
        dlg_listbox_clear(ctrl, dlg);
        dlg_listbox_addwithid(ctrl, dlg, "Auto", AUTO);
        dlg_listbox_addwithid(ctrl, dlg, "Off", FORCE_OFF);
        dlg_listbox_addwithid(ctrl, dlg, "On", FORCE_ON);
        switch (*(int *)ATOFFSET(data, ctrl->listbox.context.i)) {
          case AUTO:      dlg_listbox_select(ctrl, dlg, 0); break;
          case FORCE_OFF: dlg_listbox_select(ctrl, dlg, 1); break;
          case FORCE_ON:  dlg_listbox_select(ctrl, dlg, 2); break;
        }
        dlg_update_done(ctrl, dlg);
    } else if (event == EVENT_SELCHANGE) {
        int i = dlg_listbox_index(ctrl, dlg);
        if (i < 0)
            i = AUTO;
        else
            i = dlg_listbox_getid(ctrl, dlg, i);
        *(int *)ATOFFSET(data, ctrl->listbox.context.i) = i;
    }
}

#define SAVEDSESSION_LEN 2048

struct sessionsaver_data {
    union control *editbox, *listbox, *loadbutton, *savebutton, *delbutton;
    union control *okbutton, *cancelbutton;
    struct sesslist sesslist;
    int midsession;
};

/* 
 * Helper function to load the session selected in the list box, if
 * any, as this is done in more than one place below. Returns 0 for
 * failure.
 */
static int load_selected_session(struct sessionsaver_data *ssd,
                                 char *savedsession,
                                 void *dlg, Config *cfg, int *maybe_launch)
{
    int i = dlg_listbox_index(ssd->listbox, dlg);
    int isdef;
    if (i < 0) {
        dlg_beep(dlg);
        return 0;
    }
    isdef = !strcmp(ssd->sesslist.sessions[i], "Default Settings");
    load_settings(ssd->sesslist.sessions[i], cfg);
    if (!isdef) {
        strncpy(savedsession, ssd->sesslist.sessions[i],
                SAVEDSESSION_LEN);
        savedsession[SAVEDSESSION_LEN-1] = '\0';
        if (maybe_launch)
            *maybe_launch = TRUE;
    } else {
        savedsession[0] = '\0';
        if (maybe_launch)
            *maybe_launch = FALSE;
    }
    dlg_refresh(NULL, dlg);
    /* Restore the selection, which might have been clobbered by
     * changing the value of the edit box. */
    dlg_listbox_select(ssd->listbox, dlg, i);
    return 1;
}

static void sessionsaver_handler(union control *ctrl, void *dlg,
                                 void *data, int event)
{
    Config *cfg = (Config *)data;
    struct sessionsaver_data *ssd =
        (struct sessionsaver_data *)ctrl->generic.context.p;
    char *savedsession;

    /*
     * The first time we're called in a new dialog, we must
     * allocate space to store the current contents of the saved
     * session edit box (since it must persist even when we switch
     * panels, but is not part of the Config).
     */
    if (!ssd->editbox) {
        savedsession = NULL;
    } else if (!dlg_get_privdata(ssd->editbox, dlg)) {
        savedsession = (char *)
            dlg_alloc_privdata(ssd->editbox, dlg, SAVEDSESSION_LEN);
        savedsession[0] = '\0';
    } else {
        savedsession = dlg_get_privdata(ssd->editbox, dlg);
    }

    if (event == EVENT_REFRESH) {
        if (ctrl == ssd->editbox) {
            dlg_editbox_set(ctrl, dlg, savedsession);
        } else if (ctrl == ssd->listbox) {
            int i;
            dlg_update_start(ctrl, dlg);
            dlg_listbox_clear(ctrl, dlg);
            for (i = 0; i < ssd->sesslist.nsessions; i++)
                dlg_listbox_add(ctrl, dlg, ssd->sesslist.sessions[i]);
            dlg_update_done(ctrl, dlg);
        }
    } else if (event == EVENT_VALCHANGE) {
        int top, bottom, halfway, i;
        if (ctrl == ssd->editbox) {
            dlg_editbox_get(ctrl, dlg, savedsession,
                            SAVEDSESSION_LEN);
            top = ssd->sesslist.nsessions;
            bottom = -1;
            while (top-bottom > 1) {
                halfway = (top+bottom)/2;
                i = strcmp(savedsession, ssd->sesslist.sessions[halfway]);
                if (i <= 0 ) {
                    top = halfway;
                } else {
                    bottom = halfway;
                }
            }
            if (top == ssd->sesslist.nsessions) {
                top -= 1;
            }
            dlg_listbox_select(ssd->listbox, dlg, top);
        }
    } else if (event == EVENT_ACTION) {
        int mbl = FALSE;
        if (!ssd->midsession &&
            (ctrl == ssd->listbox ||
             (ssd->loadbutton && ctrl == ssd->loadbutton))) {
            /*
             * The user has double-clicked a session, or hit Load.
             * We must load the selected session, and then
             * terminate the configuration dialog _if_ there was a
             * double-click on the list box _and_ that session
             * contains a hostname.
             */
            if (load_selected_session(ssd, savedsession, dlg, cfg, &mbl) &&
                (mbl && ctrl == ssd->listbox && cfg_launchable(cfg))) {
                dlg_end(dlg, 1);       /* it's all over, and succeeded */
            }
        } else if (ctrl == ssd->savebutton) {
            int isdef = !strcmp(savedsession, "Default Settings");
            if (!savedsession[0]) {
                int i = dlg_listbox_index(ssd->listbox, dlg);
                if (i < 0) {
                    dlg_beep(dlg);
                    return;
                }
                isdef = !strcmp(ssd->sesslist.sessions[i], "Default Settings");
                if (!isdef) {
                    strncpy(savedsession, ssd->sesslist.sessions[i],
                            SAVEDSESSION_LEN);
                    savedsession[SAVEDSESSION_LEN-1] = '\0';
                } else {
                    savedsession[0] = '\0';
                }
            }
            {
                char *errmsg = save_settings(savedsession, cfg);
                if (errmsg) {
                    dlg_error_msg(dlg, errmsg);
                    sfree(errmsg);
                }
            }
            get_sesslist(&ssd->sesslist, FALSE);
            get_sesslist(&ssd->sesslist, TRUE);
            dlg_refresh(ssd->editbox, dlg);
            dlg_refresh(ssd->listbox, dlg);
        } else if (!ssd->midsession &&
                   ssd->delbutton && ctrl == ssd->delbutton) {
            int i = dlg_listbox_index(ssd->listbox, dlg);
            if (i <= 0) {
                dlg_beep(dlg);
            } else {
                del_settings(ssd->sesslist.sessions[i]);
                get_sesslist(&ssd->sesslist, FALSE);
                get_sesslist(&ssd->sesslist, TRUE);
                dlg_refresh(ssd->listbox, dlg);
            }
        } else if (ctrl == ssd->okbutton) {
            if (ssd->midsession) {
                /* In a mid-session Change Settings, Apply is always OK. */
                dlg_end(dlg, 1);
                return;
            }
            /*
             * Annoying special case. If the `Open' button is
             * pressed while no host name is currently set, _and_
             * the session list previously had the focus, _and_
             * there was a session selected in that which had a
             * valid host name in it, then load it and go.
             */
            if (dlg_last_focused(ctrl, dlg) == ssd->listbox &&
                !cfg_launchable(cfg)) {
                Config cfg2;
                int mbl = FALSE;
                if (!load_selected_session(ssd, savedsession, dlg,
                                           &cfg2, &mbl)) {
                    dlg_beep(dlg);
                    return;
                }
                /* If at this point we have a valid session, go! */
                if (mbl && cfg_launchable(&cfg2)) {
                    *cfg = cfg2;       /* structure copy */
                    cfg->remote_cmd_ptr = NULL;
                    dlg_end(dlg, 1);
                } else
                    dlg_beep(dlg);
                return;
            }

            /*
             * Otherwise, do the normal thing: if we have a valid
             * session, get going.
             */
            if (cfg_launchable(cfg)) {
                dlg_end(dlg, 1);
            } else
                dlg_beep(dlg);
        } else if (ctrl == ssd->cancelbutton) {
            dlg_end(dlg, 0);
        }
    }
}

struct charclass_data {
    union control *listbox, *editbox, *button;
};

static void charclass_handler(union control *ctrl, void *dlg,
                              void *data, int event)
{
    Config *cfg = (Config *)data;
    struct charclass_data *ccd =
        (struct charclass_data *)ctrl->generic.context.p;

    if (event == EVENT_REFRESH) {
        if (ctrl == ccd->listbox) {
            int i;
            dlg_update_start(ctrl, dlg);
            dlg_listbox_clear(ctrl, dlg);
            for (i = 0; i < 128; i++) {
                char str[100];
                sprintf(str, "%d\t(0x%02X)\t%c\t%d", i, i,
                        (i >= 0x21 && i != 0x7F) ? i : ' ', cfg->wordness[i]);
                dlg_listbox_add(ctrl, dlg, str);
            }
            dlg_update_done(ctrl, dlg);
        }
    } else if (event == EVENT_ACTION) {
        if (ctrl == ccd->button) {
            char str[100];
            int i, n;
            dlg_editbox_get(ccd->editbox, dlg, str, sizeof(str));
            n = atoi(str);
            for (i = 0; i < 128; i++) {
                if (dlg_listbox_issel(ccd->listbox, dlg, i))
                    cfg->wordness[i] = n;
            }
            dlg_refresh(ccd->listbox, dlg);
        }
    }
}

struct colour_data {
    union control *listbox, *redit, *gedit, *bedit, *button;
};

static const char *const colours[] = {
    "Default Foreground", "Default Bold Foreground",
    "Default Background", "Default Bold Background",
    "Cursor Text", "Cursor Colour",
    "ANSI Black", "ANSI Black Bold",
    "ANSI Red", "ANSI Red Bold",
    "ANSI Green", "ANSI Green Bold",
    "ANSI Yellow", "ANSI Yellow Bold",
    "ANSI Blue", "ANSI Blue Bold",
    "ANSI Magenta", "ANSI Magenta Bold",
    "ANSI Cyan", "ANSI Cyan Bold",
    "ANSI White", "ANSI White Bold"
};

static void colour_handler(union control *ctrl, void *dlg,
                            void *data, int event)
{
    Config *cfg = (Config *)data;
    struct colour_data *cd =
        (struct colour_data *)ctrl->generic.context.p;
    int update = FALSE, clear = FALSE, r, g, b;

    if (event == EVENT_REFRESH) {
        if (ctrl == cd->listbox) {
            int i;
            dlg_update_start(ctrl, dlg);
            dlg_listbox_clear(ctrl, dlg);
            for (i = 0; i < lenof(colours); i++)
                dlg_listbox_add(ctrl, dlg, colours[i]);
            dlg_update_done(ctrl, dlg);
            clear = TRUE;
            update = TRUE;
        }
    } else if (event == EVENT_SELCHANGE) {
        if (ctrl == cd->listbox) {
            /* The user has selected a colour. Update the RGB text. */
            int i = dlg_listbox_index(ctrl, dlg);
            if (i < 0) {
                clear = TRUE;
            } else {
                clear = FALSE;
                r = cfg->colours[i][0];
                g = cfg->colours[i][1];
                b = cfg->colours[i][2];
            }
            update = TRUE;
        }
    } else if (event == EVENT_VALCHANGE) {
        if (ctrl == cd->redit || ctrl == cd->gedit || ctrl == cd->bedit) {
            /* The user has changed the colour using the edit boxes. */
            char buf[80];
            int i, cval;

            dlg_editbox_get(ctrl, dlg, buf, lenof(buf));
            cval = atoi(buf);
            if (cval > 255) cval = 255;
            if (cval < 0)   cval = 0;

            i = dlg_listbox_index(cd->listbox, dlg);
            if (i >= 0) {
                if (ctrl == cd->redit)
                    cfg->colours[i][0] = cval;
                else if (ctrl == cd->gedit)
                    cfg->colours[i][1] = cval;
                else if (ctrl == cd->bedit)
                    cfg->colours[i][2] = cval;
            }
        }
    } else if (event == EVENT_ACTION) {
        if (ctrl == cd->button) {
            int i = dlg_listbox_index(cd->listbox, dlg);
            if (i < 0) {
                dlg_beep(dlg);
                return;
            }
            /*
             * Start a colour selector, which will send us an
             * EVENT_CALLBACK when it's finished and allow us to
             * pick up the results.
             */
            dlg_coloursel_start(ctrl, dlg,
                                cfg->colours[i][0],
                                cfg->colours[i][1],
                                cfg->colours[i][2]);
        }
    } else if (event == EVENT_CALLBACK) {
        if (ctrl == cd->button) {
            int i = dlg_listbox_index(cd->listbox, dlg);
            /*
             * Collect the results of the colour selector. Will
             * return nonzero on success, or zero if the colour
             * selector did nothing (user hit Cancel, for example).
             */
            if (dlg_coloursel_results(ctrl, dlg, &r, &g, &b)) {
                cfg->colours[i][0] = r;
                cfg->colours[i][1] = g;
                cfg->colours[i][2] = b;
                clear = FALSE;
                update = TRUE;
            }
        }
    }

    if (update) {
        if (clear) {
            dlg_editbox_set(cd->redit, dlg, "");
            dlg_editbox_set(cd->gedit, dlg, "");
            dlg_editbox_set(cd->bedit, dlg, "");
        } else {
            char buf[40];
            sprintf(buf, "%d", r); dlg_editbox_set(cd->redit, dlg, buf);
            sprintf(buf, "%d", g); dlg_editbox_set(cd->gedit, dlg, buf);
            sprintf(buf, "%d", b); dlg_editbox_set(cd->bedit, dlg, buf);
        }
    }
}

struct ttymodes_data {
    union control *modelist, *valradio, *valbox;
    union control *addbutton, *rembutton, *listbox;
};

static void ttymodes_handler(union control *ctrl, void *dlg,
                             void *data, int event)
{
    Config *cfg = (Config *)data;
    struct ttymodes_data *td =
        (struct ttymodes_data *)ctrl->generic.context.p;

    if (event == EVENT_REFRESH) {
        if (ctrl == td->listbox) {
            char *p = cfg->ttymodes;
            dlg_update_start(ctrl, dlg);
            dlg_listbox_clear(ctrl, dlg);
            while (*p) {
                int tabpos = strchr(p, '\t') - p;
                char *disp = dupprintf("%.*s\t%s", tabpos, p,
                                       (p[tabpos+1] == 'A') ? "(auto)" :
                                       p+tabpos+2);
                dlg_listbox_add(ctrl, dlg, disp);
                p += strlen(p) + 1;
                sfree(disp);
            }
            dlg_update_done(ctrl, dlg);
        } else if (ctrl == td->modelist) {
            int i;
            dlg_update_start(ctrl, dlg);
            dlg_listbox_clear(ctrl, dlg);
            for (i = 0; ttymodes[i]; i++)
                dlg_listbox_add(ctrl, dlg, ttymodes[i]);
            dlg_listbox_select(ctrl, dlg, 0); /* *shrug* */
            dlg_update_done(ctrl, dlg);
        } else if (ctrl == td->valradio) {
            dlg_radiobutton_set(ctrl, dlg, 0);
        }
    } else if (event == EVENT_ACTION) {
        if (ctrl == td->addbutton) {
            int ind = dlg_listbox_index(td->modelist, dlg);
            if (ind >= 0) {
                char type = dlg_radiobutton_get(td->valradio, dlg) ? 'V' : 'A';
                int slen, left;
                char *p, str[lenof(cfg->ttymodes)];
                /* Construct new entry */
                memset(str, 0, lenof(str));
                strncpy(str, ttymodes[ind], lenof(str)-3);
                slen = strlen(str);
                str[slen] = '\t';
                str[slen+1] = type;
                slen += 2;
                if (type == 'V') {
                    dlg_editbox_get(td->valbox, dlg, str+slen, lenof(str)-slen);
                }
                /* Find end of list, deleting any existing instance */
                p = cfg->ttymodes;
                left = lenof(cfg->ttymodes);
                while (*p) {
                    int t = strchr(p, '\t') - p;
                    if (t == strlen(ttymodes[ind]) &&
                        strncmp(p, ttymodes[ind], t) == 0) {
                        memmove(p, p+strlen(p)+1, left - (strlen(p)+1));
                        continue;
                    }
                    left -= strlen(p) + 1;
                    p    += strlen(p) + 1;
                }
                /* Append new entry */
                memset(p, 0, left);
                strncpy(p, str, left - 2);
                dlg_refresh(td->listbox, dlg);
            } else
                dlg_beep(dlg);
        } else if (ctrl == td->rembutton) {
            char *p = cfg->ttymodes;
            int i = 0, len = lenof(cfg->ttymodes);
            while (*p) {
                int multisel = dlg_listbox_index(td->listbox, dlg) < 0;
                if (dlg_listbox_issel(td->listbox, dlg, i)) {
                    if (!multisel) {
                        /* Populate controls with entry we're about to
                         * delete, for ease of editing.
                         * (If multiple entries were selected, don't
                         * touch the controls.) */
                        char *val = strchr(p, '\t');
                        if (val) {
                            int ind = 0;
                            val++;
                            while (ttymodes[ind]) {
                                if (strlen(ttymodes[ind]) == val-p-1 &&
                                    !strncmp(ttymodes[ind], p, val-p-1))
                                    break;
                                ind++;
                            }
                            dlg_listbox_select(td->modelist, dlg, ind);
                            dlg_radiobutton_set(td->valradio, dlg,
                                                (*val == 'V'));
                            dlg_editbox_set(td->valbox, dlg, val+1);
                        }
                    }
                    memmove(p, p+strlen(p)+1, len - (strlen(p)+1));
                    i++;
                    continue;
                }
                len -= strlen(p) + 1;
                p   += strlen(p) + 1;
                i++;
            }
            memset(p, 0, lenof(cfg->ttymodes) - len);
            dlg_refresh(td->listbox, dlg);
        }
    }
}

struct environ_data {
    union control *varbox, *valbox, *addbutton, *rembutton, *listbox;
};

static void environ_handler(union control *ctrl, void *dlg,
                            void *data, int event)
{
    Config *cfg = (Config *)data;
    struct environ_data *ed =
        (struct environ_data *)ctrl->generic.context.p;

    if (event == EVENT_REFRESH) {
        if (ctrl == ed->listbox) {
            char *p = cfg->environmt;
            dlg_update_start(ctrl, dlg);
            dlg_listbox_clear(ctrl, dlg);
            while (*p) {
                dlg_listbox_add(ctrl, dlg, p);
                p += strlen(p) + 1;
            }
            dlg_update_done(ctrl, dlg);
        }
    } else if (event == EVENT_ACTION) {
        if (ctrl == ed->addbutton) {
            char str[sizeof(cfg->environmt)];
            char *p;
            dlg_editbox_get(ed->varbox, dlg, str, sizeof(str)-1);
            if (!*str) {
                dlg_beep(dlg);
                return;
            }
            p = str + strlen(str);
            *p++ = '\t';
            dlg_editbox_get(ed->valbox, dlg, p, sizeof(str)-1 - (p - str));
            if (!*p) {
                dlg_beep(dlg);
                return;
            }
            p = cfg->environmt;
            while (*p) {
                while (*p)
                    p++;
                p++;
            }
            if ((p - cfg->environmt) + strlen(str) + 2 <
                sizeof(cfg->environmt)) {
                strcpy(p, str);
                p[strlen(str) + 1] = '\0';
                dlg_listbox_add(ed->listbox, dlg, str);
                dlg_editbox_set(ed->varbox, dlg, "");
                dlg_editbox_set(ed->valbox, dlg, "");
            } else {
                dlg_error_msg(dlg, "Environment too big");
            }
        } else if (ctrl == ed->rembutton) {
            int i = dlg_listbox_index(ed->listbox, dlg);
            if (i < 0) {
                dlg_beep(dlg);
            } else {
                char *p, *q, *str;

                dlg_listbox_del(ed->listbox, dlg, i);
                p = cfg->environmt;
                while (i > 0) {
                    if (!*p)
                        goto disaster;
                    while (*p)
                        p++;
                    p++;
                    i--;
                }
                q = p;
                if (!*p)
                    goto disaster;
                /* Populate controls with the entry we're about to delete
                 * for ease of editing */
                str = p;
                p = strchr(p, '\t');
                if (!p)
                    goto disaster;
                *p = '\0';
                dlg_editbox_set(ed->varbox, dlg, str);
                p++;
                str = p;
                dlg_editbox_set(ed->valbox, dlg, str);
                p = strchr(p, '\0');
                if (!p)
                    goto disaster;
                p++;
                while (*p) {
                    while (*p)
                        *q++ = *p++;
                    *q++ = *p++;
                }
                *q = '\0';
                disaster:;
            }
        }
    }
}

struct portfwd_data {
    union control *addbutton, *rembutton, *listbox;
    union control *sourcebox, *destbox, *direction;
#ifndef NO_IPV6
    union control *addressfamily;
#endif
};

static void portfwd_handler(union control *ctrl, void *dlg,
                            void *data, int event)
{
    Config *cfg = (Config *)data;
    struct portfwd_data *pfd =
        (struct portfwd_data *)ctrl->generic.context.p;

    if (event == EVENT_REFRESH) {
        if (ctrl == pfd->listbox) {
            char *p = cfg->portfwd;
            dlg_update_start(ctrl, dlg);
            dlg_listbox_clear(ctrl, dlg);
            while (*p) {
                dlg_listbox_add(ctrl, dlg, p);
                p += strlen(p) + 1;
            }
            dlg_update_done(ctrl, dlg);
        } else if (ctrl == pfd->direction) {
            /*
             * Default is Local.
             */
            dlg_radiobutton_set(ctrl, dlg, 0);
#ifndef NO_IPV6
        } else if (ctrl == pfd->addressfamily) {
            dlg_radiobutton_set(ctrl, dlg, 0);
#endif
        }
    } else if (event == EVENT_ACTION) {
        if (ctrl == pfd->addbutton) {
            char str[sizeof(cfg->portfwd)];
            char *p;
            int i, type;
            int whichbutton;

            i = 0;
#ifndef NO_IPV6
            whichbutton = dlg_radiobutton_get(pfd->addressfamily, dlg);
            if (whichbutton == 1)
                str[i++] = '4';
            else if (whichbutton == 2)
                str[i++] = '6';
#endif

            whichbutton = dlg_radiobutton_get(pfd->direction, dlg);
            if (whichbutton == 0)
                type = 'L';
            else if (whichbutton == 1)
                type = 'R';
            else
                type = 'D';
            str[i++] = type;

            dlg_editbox_get(pfd->sourcebox, dlg, str+i, sizeof(str) - i);
            if (!str[i]) {
                dlg_error_msg(dlg, "You need to specify a source port number");
                return;
            }
            p = str + strlen(str);
            if (type != 'D') {
                *p++ = '\t';
                dlg_editbox_get(pfd->destbox, dlg, p,
                                sizeof(str) - (p - str));
                if (!*p || !strchr(p, ':')) {
                    dlg_error_msg(dlg,
                                  "You need to specify a destination address\n"
                                  "in the form \"host.name:port\"");
                    return;
                }
            } else
                *p = '\0';
            p = cfg->portfwd;
            while (*p) {
                while (*p)
                    p++;
                p++;
            }
            if ((p - cfg->portfwd) + strlen(str) + 2 <=
                sizeof(cfg->portfwd)) {
                strcpy(p, str);
                p[strlen(str) + 1] = '\0';
                dlg_listbox_add(pfd->listbox, dlg, str);
                dlg_editbox_set(pfd->sourcebox, dlg, "");
                dlg_editbox_set(pfd->destbox, dlg, "");
            } else {
                dlg_error_msg(dlg, "Too many forwardings");
            }
        } else if (ctrl == pfd->rembutton) {
            int i = dlg_listbox_index(pfd->listbox, dlg);
            if (i < 0)
                dlg_beep(dlg);
            else {
                char *p, *q, *src, *dst;
                char dir;

                dlg_listbox_del(pfd->listbox, dlg, i);
                p = cfg->portfwd;
                while (i > 0) {
                    if (!*p)
                        goto disaster2;
                    while (*p)
                        p++;
                    p++;
                    i--;
                }
                q = p;
                if (!*p)
                    goto disaster2;
                /* Populate the controls with the entry we're about to
                 * delete, for ease of editing. */
                {
                    static const char *const afs = "A46";
                    char *afp = strchr(afs, *p);
#ifndef NO_IPV6
                    int idx = afp ? afp-afs : 0;
#endif
                    if (afp)
                        p++;
#ifndef NO_IPV6
                    dlg_radiobutton_set(pfd->addressfamily, dlg, idx);
#endif
                }
                {
                    static const char *const dirs = "LRD";
                    dir = *p;
                    dlg_radiobutton_set(pfd->direction, dlg,
                                        strchr(dirs, dir) - dirs);
                }
                p++;
                if (dir != 'D') {
                    src = p;
                    p = strchr(p, '\t');
                    if (!p)
                        goto disaster2;
                    *p = '\0';
                    p++;
                    dst = p;
                } else {
                    src = p;
                    dst = "";
                }
                p = strchr(p, '\0');
                if (!p)
                    goto disaster2;
                dlg_editbox_set(pfd->sourcebox, dlg, src);
                dlg_editbox_set(pfd->destbox, dlg, dst);
                p++;
                while (*p) {
                    while (*p)
                        *q++ = *p++;
                    *q++ = *p++;
                }
                *q = '\0';
                disaster2:;
            }
        }
    }
}

void setup_config_box(struct controlbox *b, int midsession,
                      int protocol, int protcfginfo)
{
    struct controlset *s;
    struct sessionsaver_data *ssd;
    struct charclass_data *ccd;
    struct colour_data *cd;
    struct ttymodes_data *td;
    struct environ_data *ed;
    struct portfwd_data *pfd;
    union control *c;
    char *str;

    ssd = (struct sessionsaver_data *)
        ctrl_alloc(b, sizeof(struct sessionsaver_data));
    memset(ssd, 0, sizeof(*ssd));
    ssd->midsession = midsession;

    /*
     * The standard panel that appears at the bottom of all panels:
     * Open, Cancel, Apply etc.
     */
    s = ctrl_getset(b, "", "", "");
    ctrl_columns(s, 5, 20, 20, 20, 20, 20);
    ssd->okbutton = ctrl_pushbutton(s,
                                    (midsession ? "Apply" : "Open"),
                                    (char)(midsession ? 'a' : 'o'),
                                    HELPCTX(no_help),
                                    sessionsaver_handler, P(ssd));
    ssd->okbutton->button.isdefault = TRUE;
    ssd->okbutton->generic.column = 3;
    ssd->cancelbutton = ctrl_pushbutton(s, "Cancel", 'c', HELPCTX(no_help),
                                        sessionsaver_handler, P(ssd));
    ssd->cancelbutton->button.iscancel = TRUE;
    ssd->cancelbutton->generic.column = 4;
    /* We carefully don't close the 5-column part, so that platform-
     * specific add-ons can put extra buttons alongside Open and Cancel. */

    /*
     * The Session panel.
     */
    str = dupprintf("Basic options for your %s session", appname);
    ctrl_settitle(b, "Session", str);
    sfree(str);

    if (!midsession) {
        struct hostport *hp = (struct hostport *)
            ctrl_alloc(b, sizeof(struct hostport));

        s = ctrl_getset(b, "Session", "hostport",
                        "Specify the destination you want to connect to");
        ctrl_columns(s, 2, 75, 25);
        c = ctrl_editbox(s, HOST_BOX_TITLE, 'n', 100,
                         HELPCTX(session_hostname),
                         config_host_handler, I(0), I(0));
        c->generic.column = 0;
        hp->host = c;
        c = ctrl_editbox(s, PORT_BOX_TITLE, 'p', 100,
                         HELPCTX(session_hostname),
                         config_port_handler, I(0), I(0));
        c->generic.column = 1;
        hp->port = c;
        ctrl_columns(s, 1, 100);

        if (!backend_from_proto(PROT_SSH)) {
            ctrl_radiobuttons(s, "Connection type:", NO_SHORTCUT, 3,
                              HELPCTX(session_hostname),
                              config_protocolbuttons_handler, P(hp),
                              "Raw", 'r', I(PROT_RAW),
                              "Telnet", 't', I(PROT_TELNET),
                              "Rlogin", 'i', I(PROT_RLOGIN),
                              NULL);
        } else {
            ctrl_radiobuttons(s, "Connection type:", NO_SHORTCUT, 4,
                              HELPCTX(session_hostname),
                              config_protocolbuttons_handler, P(hp),
                              "Raw", 'r', I(PROT_RAW),
                              "Telnet", 't', I(PROT_TELNET),
                              "Rlogin", 'i', I(PROT_RLOGIN),
                              "SSH", 's', I(PROT_SSH),
                              NULL);
        }
    }

    /*
     * The Load/Save panel is available even in mid-session.
     */
    s = ctrl_getset(b, "Session", "savedsessions",
                    midsession ? "Save the current session settings" :
                    "Load, save or delete a stored session");
    ctrl_columns(s, 2, 75, 25);
    get_sesslist(&ssd->sesslist, TRUE);
    ssd->editbox = ctrl_editbox(s, "Saved Sessions", 'e', 100,
                                HELPCTX(session_saved),
                                sessionsaver_handler, P(ssd), P(NULL));
    ssd->editbox->generic.column = 0;
    /* Reset columns so that the buttons are alongside the list, rather
     * than alongside that edit box. */
    ctrl_columns(s, 1, 100);
    ctrl_columns(s, 2, 75, 25);
    ssd->listbox = ctrl_listbox(s, NULL, NO_SHORTCUT,
                                HELPCTX(session_saved),
                                sessionsaver_handler, P(ssd));
    ssd->listbox->generic.column = 0;
    ssd->listbox->listbox.height = 7;
    if (!midsession) {
        ssd->loadbutton = ctrl_pushbutton(s, "Load", 'l',
                                          HELPCTX(session_saved),
                                          sessionsaver_handler, P(ssd));
        ssd->loadbutton->generic.column = 1;
    } else {
        /* We can't offer the Load button mid-session, as it would allow the
         * user to load and subsequently save settings they can't see. (And
         * also change otherwise immutable settings underfoot; that probably
         * shouldn't be a problem, but.) */
        ssd->loadbutton = NULL;
    }
    /* "Save" button is permitted mid-session. */
    ssd->savebutton = ctrl_pushbutton(s, "Save", 'v',
                                      HELPCTX(session_saved),
                                      sessionsaver_handler, P(ssd));
    ssd->savebutton->generic.column = 1;
    if (!midsession) {
        ssd->delbutton = ctrl_pushbutton(s, "Delete", 'd',
                                         HELPCTX(session_saved),
                                         sessionsaver_handler, P(ssd));
        ssd->delbutton->generic.column = 1;
    } else {
        /* Disable the Delete button mid-session too, for UI consistency. */
        ssd->delbutton = NULL;
    }
    ctrl_columns(s, 1, 100);

    s = ctrl_getset(b, "Session", "otheropts", NULL);
    c = ctrl_radiobuttons(s, "Close window on exit:", 'w', 4,
                          HELPCTX(session_coe),
                          dlg_stdradiobutton_handler,
                          I(offsetof(Config, close_on_exit)),
                          "Always", I(FORCE_ON),
                          "Never", I(FORCE_OFF),
                          "Only on clean exit", I(AUTO), NULL);

    /*
     * The Session/Logging panel.
     */
    ctrl_settitle(b, "Session/Logging", "Options controlling session logging");

    s = ctrl_getset(b, "Session/Logging", "main", NULL);
    /*
     * The logging buttons change depending on whether SSH packet
     * logging can sensibly be available.
     */
    {
        char *sshlogname, *sshrawlogname;
        if ((midsession && protocol == PROT_SSH) ||
            (!midsession && backend_from_proto(PROT_SSH))) {
            sshlogname = "SSH packets";
            sshrawlogname = "SSH packets and raw data";
        } else {
            sshlogname = NULL;         /* this will disable both buttons */
            sshrawlogname = NULL;      /* this will just placate optimisers */
        }
        ctrl_radiobuttons(s, "Session logging:", NO_SHORTCUT, 2,
                          HELPCTX(logging_main),
                          loggingbuttons_handler,
                          I(offsetof(Config, logtype)),
                          "None", 't', I(LGTYP_NONE),
                          "Printable output", 'p', I(LGTYP_ASCII),
                          "All session output", 'l', I(LGTYP_DEBUG),
                          sshlogname, 's', I(LGTYP_PACKETS),
                          sshrawlogname, 'r', I(LGTYP_SSHRAW),
                          NULL);
    }
    ctrl_filesel(s, "Log file name:", 'f',
                 NULL, TRUE, "Select session log file name",
                 HELPCTX(logging_filename),
                 dlg_stdfilesel_handler, I(offsetof(Config, logfilename)));
    ctrl_text(s, "(Log file name can contain &Y, &M, &D for date,"
              " &T for time, and &H for host name)",
              HELPCTX(logging_filename));
    ctrl_radiobuttons(s, "What to do if the log file already exists:", 'e', 1,
                      HELPCTX(logging_exists),
                      dlg_stdradiobutton_handler, I(offsetof(Config,logxfovr)),
                      "Always overwrite it", I(LGXF_OVR),
                      "Always append to the end of it", I(LGXF_APN),
                      "Ask the user every time", I(LGXF_ASK), NULL);
    ctrl_checkbox(s, "Flush log file frequently", 'u',
                 HELPCTX(logging_flush),
                 dlg_stdcheckbox_handler, I(offsetof(Config,logflush)));

    if ((midsession && protocol == PROT_SSH) ||
        (!midsession && backend_from_proto(PROT_SSH))) {
        s = ctrl_getset(b, "Session/Logging", "ssh",
                        "Options specific to SSH packet logging");
        ctrl_checkbox(s, "Omit known password fields", 'k',
                      HELPCTX(logging_ssh_omit_password),
                      dlg_stdcheckbox_handler, I(offsetof(Config,logomitpass)));
        ctrl_checkbox(s, "Omit session data", 'd',
                      HELPCTX(logging_ssh_omit_data),
                      dlg_stdcheckbox_handler, I(offsetof(Config,logomitdata)));
    }

    /*
     * The Terminal panel.
     */
    ctrl_settitle(b, "Terminal", "Options controlling the terminal emulation");

    s = ctrl_getset(b, "Terminal", "general", "Set various terminal options");
    ctrl_checkbox(s, "Auto wrap mode initially on", 'w',
                  HELPCTX(terminal_autowrap),
                  dlg_stdcheckbox_handler, I(offsetof(Config,wrap_mode)));
    ctrl_checkbox(s, "DEC Origin Mode initially on", 'd',
                  HELPCTX(terminal_decom),
                  dlg_stdcheckbox_handler, I(offsetof(Config,dec_om)));
    ctrl_checkbox(s, "Implicit CR in every LF", 'r',
                  HELPCTX(terminal_lfhascr),
                  dlg_stdcheckbox_handler, I(offsetof(Config,lfhascr)));
    ctrl_checkbox(s, "Implicit LF in every CR", 'f',
                  HELPCTX(terminal_crhaslf),
                  dlg_stdcheckbox_handler, I(offsetof(Config,crhaslf)));
    ctrl_checkbox(s, "Use background colour to erase screen", 'e',
                  HELPCTX(terminal_bce),
                  dlg_stdcheckbox_handler, I(offsetof(Config,bce)));
    ctrl_checkbox(s, "Enable blinking text", 'n',
                  HELPCTX(terminal_blink),
                  dlg_stdcheckbox_handler, I(offsetof(Config,blinktext)));
    ctrl_editbox(s, "Answerback to ^E:", 's', 100,
                 HELPCTX(terminal_answerback),
                 dlg_stdeditbox_handler, I(offsetof(Config,answerback)),
                 I(sizeof(((Config *)0)->answerback)));

    s = ctrl_getset(b, "Terminal", "ldisc", "Line discipline options");
    ctrl_radiobuttons(s, "Local echo:", 'l', 3,
                      HELPCTX(terminal_localecho),
                      dlg_stdradiobutton_handler,I(offsetof(Config,localecho)),
                      "Auto", I(AUTO),
                      "Force on", I(FORCE_ON),
                      "Force off", I(FORCE_OFF), NULL);
    ctrl_radiobuttons(s, "Local line editing:", 't', 3,
                      HELPCTX(terminal_localedit),
                      dlg_stdradiobutton_handler,I(offsetof(Config,localedit)),
                      "Auto", I(AUTO),
                      "Force on", I(FORCE_ON),
                      "Force off", I(FORCE_OFF), NULL);

    s = ctrl_getset(b, "Terminal", "printing", "Remote-controlled printing");
    ctrl_combobox(s, "Printer to send ANSI printer output to:", 'p', 100,
                  HELPCTX(terminal_printing),
                  printerbox_handler, P(NULL), P(NULL));

    /*
     * The Terminal/Keyboard panel.
     */
    ctrl_settitle(b, "Terminal/Keyboard",
                  "Options controlling the effects of keys");

    s = ctrl_getset(b, "Terminal/Keyboard", "mappings",
                    "Change the sequences sent by:");
    ctrl_radiobuttons(s, "The Backspace key", 'b', 2,
                      HELPCTX(keyboard_backspace),
                      dlg_stdradiobutton_handler,
                      I(offsetof(Config, bksp_is_delete)),
                      "Control-H", I(0), "Control-? (127)", I(1), NULL);
    ctrl_radiobuttons(s, "The Home and End keys", 'e', 2,
                      HELPCTX(keyboard_homeend),
                      dlg_stdradiobutton_handler,
                      I(offsetof(Config, rxvt_homeend)),
                      "Standard", I(0), "rxvt", I(1), NULL);
    ctrl_radiobuttons(s, "The Function keys and keypad", 'f', 3,
                      HELPCTX(keyboard_funkeys),
                      dlg_stdradiobutton_handler,
                      I(offsetof(Config, funky_type)),
                      "ESC[n~", I(0), "Linux", I(1), "Xterm R6", I(2),
                      "VT400", I(3), "VT100+", I(4), "SCO", I(5), NULL);

    s = ctrl_getset(b, "Terminal/Keyboard", "appkeypad",
                    "Application keypad settings:");
    ctrl_radiobuttons(s, "Initial state of cursor keys:", 'r', 3,
                      HELPCTX(keyboard_appcursor),
                      dlg_stdradiobutton_handler,
                      I(offsetof(Config, app_cursor)),
                      "Normal", I(0), "Application", I(1), NULL);
    ctrl_radiobuttons(s, "Initial state of numeric keypad:", 'n', 3,
                      HELPCTX(keyboard_appkeypad),
                      numeric_keypad_handler, P(NULL),
                      "Normal", I(0), "Application", I(1), "NetHack", I(2),
                      NULL);

    /*
     * The Terminal/Bell panel.
     */
    ctrl_settitle(b, "Terminal/Bell",
                  "Options controlling the terminal bell");

    s = ctrl_getset(b, "Terminal/Bell", "style", "Set the style of bell");
    ctrl_radiobuttons(s, "Action to happen when a bell occurs:", 'b', 1,
                      HELPCTX(bell_style),
                      dlg_stdradiobutton_handler, I(offsetof(Config, beep)),
                      "None (bell disabled)", I(BELL_DISABLED),
                      "Make default system alert sound", I(BELL_DEFAULT),
                      "Visual bell (flash window)", I(BELL_VISUAL), NULL);

    s = ctrl_getset(b, "Terminal/Bell", "overload",
                    "Control the bell overload behaviour");
    ctrl_checkbox(s, "Bell is temporarily disabled when over-used", 'd',
                  HELPCTX(bell_overload),
                  dlg_stdcheckbox_handler, I(offsetof(Config,bellovl)));
    ctrl_editbox(s, "Over-use means this many bells...", 'm', 20,
                 HELPCTX(bell_overload),
                 dlg_stdeditbox_handler, I(offsetof(Config,bellovl_n)), I(-1));
    ctrl_editbox(s, "... in this many seconds", 't', 20,
                 HELPCTX(bell_overload),
                 dlg_stdeditbox_handler, I(offsetof(Config,bellovl_t)),
                 I(-TICKSPERSEC));
    ctrl_text(s, "The bell is re-enabled after a few seconds of silence.",
              HELPCTX(bell_overload));
    ctrl_editbox(s, "Seconds of silence required", 's', 20,
                 HELPCTX(bell_overload),
                 dlg_stdeditbox_handler, I(offsetof(Config,bellovl_s)),
                 I(-TICKSPERSEC));

    /*
     * The Terminal/Features panel.
     */
    ctrl_settitle(b, "Terminal/Features",
                  "Enabling and disabling advanced terminal features");

    s = ctrl_getset(b, "Terminal/Features", "main", NULL);
    ctrl_checkbox(s, "Disable application cursor keys mode", 'u',
                  HELPCTX(features_application),
                  dlg_stdcheckbox_handler, I(offsetof(Config,no_applic_c)));
    ctrl_checkbox(s, "Disable application keypad mode", 'k',
                  HELPCTX(features_application),
                  dlg_stdcheckbox_handler, I(offsetof(Config,no_applic_k)));
    ctrl_checkbox(s, "Disable xterm-style mouse reporting", 'x',
                  HELPCTX(features_mouse),
                  dlg_stdcheckbox_handler, I(offsetof(Config,no_mouse_rep)));
    ctrl_checkbox(s, "Disable remote-controlled terminal resizing", 's',
                  HELPCTX(features_resize),
                  dlg_stdcheckbox_handler,
                  I(offsetof(Config,no_remote_resize)));
    ctrl_checkbox(s, "Disable switching to alternate terminal screen", 'w',
                  HELPCTX(features_altscreen),
                  dlg_stdcheckbox_handler, I(offsetof(Config,no_alt_screen)));
    ctrl_checkbox(s, "Disable remote-controlled window title changing", 't',
                  HELPCTX(features_retitle),
                  dlg_stdcheckbox_handler,
                  I(offsetof(Config,no_remote_wintitle)));
    ctrl_radiobuttons(s, "Response to remote title query (SECURITY):", 'q', 3,
                      HELPCTX(features_qtitle),
                      dlg_stdradiobutton_handler,
                      I(offsetof(Config,remote_qtitle_action)),
                      "None", I(TITLE_NONE),
                      "Empty string", I(TITLE_EMPTY),
                      "Window title", I(TITLE_REAL), NULL);
    ctrl_checkbox(s, "Disable destructive backspace on server sending ^?",'b',
                  HELPCTX(features_dbackspace),
                  dlg_stdcheckbox_handler, I(offsetof(Config,no_dbackspace)));
    ctrl_checkbox(s, "Disable remote-controlled character set configuration",
                  'r', HELPCTX(features_charset), dlg_stdcheckbox_handler,
                  I(offsetof(Config,no_remote_charset)));
    ctrl_checkbox(s, "Disable Arabic text shaping",
                  'l', HELPCTX(features_arabicshaping), dlg_stdcheckbox_handler,
                  I(offsetof(Config, arabicshaping)));
    ctrl_checkbox(s, "Disable bidirectional text display",
                  'd', HELPCTX(features_bidi), dlg_stdcheckbox_handler,
                  I(offsetof(Config, bidi)));

    /*
     * The Window panel.
     */
    str = dupprintf("Options controlling %s's window", appname);
    ctrl_settitle(b, "Window", str);
    sfree(str);

    s = ctrl_getset(b, "Window", "size", "Set the size of the window");
    ctrl_columns(s, 2, 50, 50);
    c = ctrl_editbox(s, "Columns", 'm', 100,
                     HELPCTX(window_size),
                     dlg_stdeditbox_handler, I(offsetof(Config,width)), I(-1));
    c->generic.column = 0;
    c = ctrl_editbox(s, "Rows", 'r', 100,
                     HELPCTX(window_size),
                     dlg_stdeditbox_handler, I(offsetof(Config,height)),I(-1));
    c->generic.column = 1;
    ctrl_columns(s, 1, 100);

    s = ctrl_getset(b, "Window", "scrollback",
                    "Control the scrollback in the window");
    ctrl_editbox(s, "Lines of scrollback", 's', 50,
                 HELPCTX(window_scrollback),
                 dlg_stdeditbox_handler, I(offsetof(Config,savelines)), I(-1));
    ctrl_checkbox(s, "Display scrollbar", 'd',
                  HELPCTX(window_scrollback),
                  dlg_stdcheckbox_handler, I(offsetof(Config,scrollbar)));
    ctrl_checkbox(s, "Reset scrollback on keypress", 'k',
                  HELPCTX(window_scrollback),
                  dlg_stdcheckbox_handler, I(offsetof(Config,scroll_on_key)));
    ctrl_checkbox(s, "Reset scrollback on display activity", 'p',
                  HELPCTX(window_scrollback),
                  dlg_stdcheckbox_handler, I(offsetof(Config,scroll_on_disp)));
    ctrl_checkbox(s, "Push erased text into scrollback", 'e',
                  HELPCTX(window_erased),
                  dlg_stdcheckbox_handler,
                  I(offsetof(Config,erase_to_scrollback)));

    /*
     * The Window/Appearance panel.
     */
    str = dupprintf("Configure the appearance of %s's window", appname);
    ctrl_settitle(b, "Window/Appearance", str);
    sfree(str);

    s = ctrl_getset(b, "Window/Appearance", "cursor",
                    "Adjust the use of the cursor");
    ctrl_radiobuttons(s, "Cursor appearance:", NO_SHORTCUT, 3,
                      HELPCTX(appearance_cursor),
                      dlg_stdradiobutton_handler,
                      I(offsetof(Config, cursor_type)),
                      "Block", 'l', I(0),
                      "Underline", 'u', I(1),
                      "Vertical line", 'v', I(2), NULL);
    ctrl_checkbox(s, "Cursor blinks", 'b',
                  HELPCTX(appearance_cursor),
                  dlg_stdcheckbox_handler, I(offsetof(Config,blink_cur)));

    s = ctrl_getset(b, "Window/Appearance", "font",
                    "Font settings");
    ctrl_fontsel(s, "Font used in the terminal window", 'n',
                 HELPCTX(appearance_font),
                 dlg_stdfontsel_handler, I(offsetof(Config, font)));

    s = ctrl_getset(b, "Window/Appearance", "mouse",
                    "Adjust the use of the mouse pointer");
    ctrl_checkbox(s, "Hide mouse pointer when typing in window", 'p',
                  HELPCTX(appearance_hidemouse),
                  dlg_stdcheckbox_handler, I(offsetof(Config,hide_mouseptr)));

    s = ctrl_getset(b, "Window/Appearance", "border",
                    "Adjust the window border");
    ctrl_editbox(s, "Gap between text and window edge:", 'e', 20,
                 HELPCTX(appearance_border),
                 dlg_stdeditbox_handler,
                 I(offsetof(Config,window_border)), I(-1));

    /*
     * The Window/Behaviour panel.
     */
    str = dupprintf("Configure the behaviour of %s's window", appname);
    ctrl_settitle(b, "Window/Behaviour", str);
    sfree(str);

    s = ctrl_getset(b, "Window/Behaviour", "title",
                    "Adjust the behaviour of the window title");
    ctrl_editbox(s, "Window title:", 't', 100,
                 HELPCTX(appearance_title),
                 dlg_stdeditbox_handler, I(offsetof(Config,wintitle)),
                 I(sizeof(((Config *)0)->wintitle)));
    ctrl_checkbox(s, "Separate window and icon titles", 'i',
                  HELPCTX(appearance_title),
                  dlg_stdcheckbox_handler,
                  I(CHECKBOX_INVERT | offsetof(Config,win_name_always)));

    s = ctrl_getset(b, "Window/Behaviour", "main", NULL);
    ctrl_checkbox(s, "Warn before closing window", 'w',
                  HELPCTX(behaviour_closewarn),
                  dlg_stdcheckbox_handler, I(offsetof(Config,warn_on_close)));

    /*
     * The Window/Translation panel.
     */
    ctrl_settitle(b, "Window/Translation",
                  "Options controlling character set translation");

    s = ctrl_getset(b, "Window/Translation", "trans",
                    "Character set translation");
    ctrl_combobox(s, "Remote character set:",
                  'r', 100, HELPCTX(translation_codepage),
                  codepage_handler, P(NULL), P(NULL));

    s = ctrl_getset(b, "Window/Translation", "tweaks", NULL);
    ctrl_checkbox(s, "Treat CJK ambiguous characters as wide", 'w',
                  HELPCTX(translation_cjk_ambig_wide),
                  dlg_stdcheckbox_handler, I(offsetof(Config,cjk_ambig_wide)));

    str = dupprintf("Adjust how %s handles line drawing characters", appname);
    s = ctrl_getset(b, "Window/Translation", "linedraw", str);
    sfree(str);
    ctrl_radiobuttons(s, "Handling of line drawing characters:", NO_SHORTCUT,1,
                      HELPCTX(translation_linedraw),
                      dlg_stdradiobutton_handler,
                      I(offsetof(Config, vtmode)),
                      "Use Unicode line drawing code points",'u',I(VT_UNICODE),
                      "Poor man's line drawing (+, - and |)",'p',I(VT_POORMAN),
                      NULL);
    ctrl_checkbox(s, "Copy and paste line drawing characters as lqqqk",'d',
                  HELPCTX(selection_linedraw),
                  dlg_stdcheckbox_handler, I(offsetof(Config,rawcnp)));

    /*
     * The Window/Selection panel.
     */
    ctrl_settitle(b, "Window/Selection", "Options controlling copy and paste");
        
    s = ctrl_getset(b, "Window/Selection", "mouse",
                    "Control use of mouse");
    ctrl_checkbox(s, "Shift overrides application's use of mouse", 'p',
                  HELPCTX(selection_shiftdrag),
                  dlg_stdcheckbox_handler, I(offsetof(Config,mouse_override)));
    ctrl_radiobuttons(s,
                      "Default selection mode (Alt+drag does the other one):",
                      NO_SHORTCUT, 2,
                      HELPCTX(selection_rect),
                      dlg_stdradiobutton_handler,
                      I(offsetof(Config, rect_select)),
                      "Normal", 'n', I(0),
                      "Rectangular block", 'r', I(1), NULL);

    s = ctrl_getset(b, "Window/Selection", "charclass",
                    "Control the select-one-word-at-a-time mode");
    ccd = (struct charclass_data *)
        ctrl_alloc(b, sizeof(struct charclass_data));
    ccd->listbox = ctrl_listbox(s, "Character classes:", 'e',
                                HELPCTX(selection_charclasses),
                                charclass_handler, P(ccd));
    ccd->listbox->listbox.multisel = 1;
    ccd->listbox->listbox.ncols = 4;
    ccd->listbox->listbox.percentages = snewn(4, int);
    ccd->listbox->listbox.percentages[0] = 15;
    ccd->listbox->listbox.percentages[1] = 25;
    ccd->listbox->listbox.percentages[2] = 20;
    ccd->listbox->listbox.percentages[3] = 40;
    ctrl_columns(s, 2, 67, 33);
    ccd->editbox = ctrl_editbox(s, "Set to class", 't', 50,
                                HELPCTX(selection_charclasses),
                                charclass_handler, P(ccd), P(NULL));
    ccd->editbox->generic.column = 0;
    ccd->button = ctrl_pushbutton(s, "Set", 's',
                                  HELPCTX(selection_charclasses),
                                  charclass_handler, P(ccd));
    ccd->button->generic.column = 1;
    ctrl_columns(s, 1, 100);

    /*
     * The Window/Colours panel.
     */
    ctrl_settitle(b, "Window/Colours", "Options controlling use of colours");

    s = ctrl_getset(b, "Window/Colours", "general",
                    "General options for colour usage");
    ctrl_checkbox(s, "Allow terminal to specify ANSI colours", 'i',
                  HELPCTX(colours_ansi),
                  dlg_stdcheckbox_handler, I(offsetof(Config,ansi_colour)));
    ctrl_checkbox(s, "Allow terminal to use xterm 256-colour mode", '2',
                  HELPCTX(colours_xterm256), dlg_stdcheckbox_handler,
                  I(offsetof(Config,xterm_256_colour)));
    ctrl_checkbox(s, "Bolded text is a different colour", 'b',
                  HELPCTX(colours_bold),
                  dlg_stdcheckbox_handler, I(offsetof(Config,bold_colour)));

    str = dupprintf("Adjust the precise colours %s displays", appname);
    s = ctrl_getset(b, "Window/Colours", "adjust", str);
    sfree(str);
    ctrl_text(s, "Select a colour from the list, and then click the"
              " Modify button to change its appearance.",
              HELPCTX(colours_config));
    ctrl_columns(s, 2, 67, 33);
    cd = (struct colour_data *)ctrl_alloc(b, sizeof(struct colour_data));
    cd->listbox = ctrl_listbox(s, "Select a colour to adjust:", 'u',
                               HELPCTX(colours_config), colour_handler, P(cd));
    cd->listbox->generic.column = 0;
    cd->listbox->listbox.height = 7;
    c = ctrl_text(s, "RGB value:", HELPCTX(colours_config));
    c->generic.column = 1;
    cd->redit = ctrl_editbox(s, "Red", 'r', 50, HELPCTX(colours_config),
                             colour_handler, P(cd), P(NULL));
    cd->redit->generic.column = 1;
    cd->gedit = ctrl_editbox(s, "Green", 'n', 50, HELPCTX(colours_config),
                             colour_handler, P(cd), P(NULL));
    cd->gedit->generic.column = 1;
    cd->bedit = ctrl_editbox(s, "Blue", 'e', 50, HELPCTX(colours_config),
                             colour_handler, P(cd), P(NULL));
    cd->bedit->generic.column = 1;
    cd->button = ctrl_pushbutton(s, "Modify", 'm', HELPCTX(colours_config),
                                 colour_handler, P(cd));
    cd->button->generic.column = 1;
    ctrl_columns(s, 1, 100);

    /*
     * The Connection panel. This doesn't show up if we're in a
     * non-network utility such as pterm. We tell this by being
     * passed a protocol < 0.
     */
    if (protocol >= 0) {
        ctrl_settitle(b, "Connection", "Options controlling the connection");

        s = ctrl_getset(b, "Connection", "keepalive",
                        "Sending of null packets to keep session active");
        ctrl_editbox(s, "Seconds between keepalives (0 to turn off)", 'k', 20,
                     HELPCTX(connection_keepalive),
                     dlg_stdeditbox_handler, I(offsetof(Config,ping_interval)),
                     I(-1));

        if (!midsession) {
            s = ctrl_getset(b, "Connection", "tcp",
                            "Low-level TCP connection options");
            ctrl_checkbox(s, "Disable Nagle's algorithm (TCP_NODELAY option)",
                          'n', HELPCTX(connection_nodelay),
                          dlg_stdcheckbox_handler,
                          I(offsetof(Config,tcp_nodelay)));
            ctrl_checkbox(s, "Enable TCP keepalives (SO_KEEPALIVE option)",
                          'p', HELPCTX(connection_tcpkeepalive),
                          dlg_stdcheckbox_handler,
                          I(offsetof(Config,tcp_keepalives)));
#ifndef NO_IPV6
            s = ctrl_getset(b, "Connection", "ipversion",
                          "Internet protocol version");
            ctrl_radiobuttons(s, NULL, NO_SHORTCUT, 3,
                          HELPCTX(connection_ipversion),
                          dlg_stdradiobutton_handler,
                          I(offsetof(Config, addressfamily)),
                          "Auto", 'u', I(ADDRTYPE_UNSPEC),
                          "IPv4", '4', I(ADDRTYPE_IPV4),
                          "IPv6", '6', I(ADDRTYPE_IPV6),
                          NULL);
#endif

            {
                char *label = backend_from_proto(PROT_SSH) ?
                    "Logical name of remote host (e.g. for SSH key lookup):" :
                    "Logical name of remote host:";
                s = ctrl_getset(b, "Connection", "identity",
                                "Logical name of remote host");
                ctrl_editbox(s, label, 'm', 100,
                             HELPCTX(connection_loghost),
                             dlg_stdeditbox_handler, I(offsetof(Config,loghost)),
                             I(sizeof(((Config *)0)->loghost)));
            }
        }

        /*
         * A sub-panel Connection/Data, containing options that
         * decide on data to send to the server.
         */
        if (!midsession) {
            ctrl_settitle(b, "Connection/Data", "Data to send to the server");

            s = ctrl_getset(b, "Connection/Data", "login",
                            "Login details");
            ctrl_editbox(s, "Auto-login username", 'u', 50,
                         HELPCTX(connection_username),
                         dlg_stdeditbox_handler, I(offsetof(Config,username)),
                         I(sizeof(((Config *)0)->username)));
            {
                /* We assume the local username is sufficiently stable
                 * to include on the dialog box. */
                char *user = get_username();
                char *userlabel = dupprintf("Use system username (%s)", user);
                sfree(user);
                ctrl_radiobuttons(s, "When username is not specified:", 'n', 4,
                                  HELPCTX(connection_username_from_env),
                                  dlg_stdradiobutton_handler,
                                  I(offsetof(Config, username_from_env)),
                                  "Prompt", I(FALSE),
                                  userlabel, I(TRUE),
                                  NULL);
                sfree(userlabel);
            }

            s = ctrl_getset(b, "Connection/Data", "term",
                            "Terminal details");
            ctrl_editbox(s, "Terminal-type string", 't', 50,
                         HELPCTX(connection_termtype),
                         dlg_stdeditbox_handler, I(offsetof(Config,termtype)),
                         I(sizeof(((Config *)0)->termtype)));
            ctrl_editbox(s, "Terminal speeds", 's', 50,
                         HELPCTX(connection_termspeed),
                         dlg_stdeditbox_handler, I(offsetof(Config,termspeed)),
                         I(sizeof(((Config *)0)->termspeed)));

            s = ctrl_getset(b, "Connection/Data", "env",
                            "Environment variables");
            ctrl_columns(s, 2, 80, 20);
            ed = (struct environ_data *)
                ctrl_alloc(b, sizeof(struct environ_data));
            ed->varbox = ctrl_editbox(s, "Variable", 'v', 60,
                                      HELPCTX(telnet_environ),
                                      environ_handler, P(ed), P(NULL));
            ed->varbox->generic.column = 0;
            ed->valbox = ctrl_editbox(s, "Value", 'l', 60,
                                      HELPCTX(telnet_environ),
                                      environ_handler, P(ed), P(NULL));
            ed->valbox->generic.column = 0;
            ed->addbutton = ctrl_pushbutton(s, "Add", 'd',
                                            HELPCTX(telnet_environ),
                                            environ_handler, P(ed));
            ed->addbutton->generic.column = 1;
            ed->rembutton = ctrl_pushbutton(s, "Remove", 'r',
                                            HELPCTX(telnet_environ),
                                            environ_handler, P(ed));
            ed->rembutton->generic.column = 1;
            ctrl_columns(s, 1, 100);
            ed->listbox = ctrl_listbox(s, NULL, NO_SHORTCUT,
                                       HELPCTX(telnet_environ),
                                       environ_handler, P(ed));
            ed->listbox->listbox.height = 3;
            ed->listbox->listbox.ncols = 2;
            ed->listbox->listbox.percentages = snewn(2, int);
            ed->listbox->listbox.percentages[0] = 30;
            ed->listbox->listbox.percentages[1] = 70;
        }

    }

    if (!midsession) {
        /*
         * The Connection/Proxy panel.
         */
        ctrl_settitle(b, "Connection/Proxy",
                      "Options controlling proxy usage");

        s = ctrl_getset(b, "Connection/Proxy", "basics", NULL);
        ctrl_radiobuttons(s, "Proxy type:", 't', 3,
                          HELPCTX(proxy_type),
                          dlg_stdradiobutton_handler,
                          I(offsetof(Config, proxy_type)),
                          "None", I(PROXY_NONE),
                          "SOCKS 4", I(PROXY_SOCKS4),
                          "SOCKS 5", I(PROXY_SOCKS5),
                          "HTTP", I(PROXY_HTTP),
                          "Telnet", I(PROXY_TELNET),
                          NULL);
        ctrl_columns(s, 2, 80, 20);
        c = ctrl_editbox(s, "Proxy hostname", 'y', 100,
                         HELPCTX(proxy_main),
                         dlg_stdeditbox_handler,
                         I(offsetof(Config,proxy_host)),
                         I(sizeof(((Config *)0)->proxy_host)));
        c->generic.column = 0;
        c = ctrl_editbox(s, "Port", 'p', 100,
                         HELPCTX(proxy_main),
                         dlg_stdeditbox_handler,
                         I(offsetof(Config,proxy_port)),
                         I(-1));
        c->generic.column = 1;
        ctrl_columns(s, 1, 100);
        ctrl_editbox(s, "Exclude Hosts/IPs", 'e', 100,
                     HELPCTX(proxy_exclude),
                     dlg_stdeditbox_handler,
                     I(offsetof(Config,proxy_exclude_list)),
                     I(sizeof(((Config *)0)->proxy_exclude_list)));
        ctrl_checkbox(s, "Consider proxying local host connections", 'x',
                      HELPCTX(proxy_exclude),
                      dlg_stdcheckbox_handler,
                      I(offsetof(Config,even_proxy_localhost)));
        ctrl_radiobuttons(s, "Do DNS name lookup at proxy end:", 'd', 3,
                          HELPCTX(proxy_dns),
                          dlg_stdradiobutton_handler,
                          I(offsetof(Config, proxy_dns)),
                          "No", I(FORCE_OFF),
                          "Auto", I(AUTO),
                          "Yes", I(FORCE_ON), NULL);
        ctrl_editbox(s, "Username", 'u', 60,
                     HELPCTX(proxy_auth),
                     dlg_stdeditbox_handler,
                     I(offsetof(Config,proxy_username)),
                     I(sizeof(((Config *)0)->proxy_username)));
        c = ctrl_editbox(s, "Password", 'w', 60,
                         HELPCTX(proxy_auth),
                         dlg_stdeditbox_handler,
                         I(offsetof(Config,proxy_password)),
                         I(sizeof(((Config *)0)->proxy_password)));
        c->editbox.password = 1;
        ctrl_editbox(s, "Telnet command", 'm', 100,
                     HELPCTX(proxy_command),
                     dlg_stdeditbox_handler,
                     I(offsetof(Config,proxy_telnet_command)),
                     I(sizeof(((Config *)0)->proxy_telnet_command)));
    }

    /*
     * The Telnet panel exists in the base config box, and in a
     * mid-session reconfig box _if_ we're using Telnet.
     */
    if (!midsession || protocol == PROT_TELNET) {
        /*
         * The Connection/Telnet panel.
         */
        ctrl_settitle(b, "Connection/Telnet",
                      "Options controlling Telnet connections");

        s = ctrl_getset(b, "Connection/Telnet", "protocol",
                        "Telnet protocol adjustments");

        if (!midsession) {
            ctrl_radiobuttons(s, "Handling of OLD_ENVIRON ambiguity:",
                              NO_SHORTCUT, 2,
                              HELPCTX(telnet_oldenviron),
                              dlg_stdradiobutton_handler,
                              I(offsetof(Config, rfc_environ)),
                              "BSD (commonplace)", 'b', I(0),
                              "RFC 1408 (unusual)", 'f', I(1), NULL);
            ctrl_radiobuttons(s, "Telnet negotiation mode:", 't', 2,
                              HELPCTX(telnet_passive),
                              dlg_stdradiobutton_handler,
                              I(offsetof(Config, passive_telnet)),
                              "Passive", I(1), "Active", I(0), NULL);
        }
        ctrl_checkbox(s, "Keyboard sends Telnet special commands", 'k',
                      HELPCTX(telnet_specialkeys),
                      dlg_stdcheckbox_handler,
                      I(offsetof(Config,telnet_keyboard)));
        ctrl_checkbox(s, "Return key sends Telnet New Line instead of ^M",
                      'm', HELPCTX(telnet_newline),
                      dlg_stdcheckbox_handler,
                      I(offsetof(Config,telnet_newline)));
    }

    if (!midsession) {

        /*
         * The Connection/Rlogin panel.
         */
        ctrl_settitle(b, "Connection/Rlogin",
                      "Options controlling Rlogin connections");

        s = ctrl_getset(b, "Connection/Rlogin", "data",
                        "Data to send to the server");
        ctrl_editbox(s, "Local username:", 'l', 50,
                     HELPCTX(rlogin_localuser),
                     dlg_stdeditbox_handler, I(offsetof(Config,localusername)),
                     I(sizeof(((Config *)0)->localusername)));

    }

    /*
     * All the SSH stuff is omitted in PuTTYtel, or in a reconfig
     * when we're not doing SSH.
     */

    if (backend_from_proto(PROT_SSH) && (!midsession || protocol == PROT_SSH)) {

        /*
         * The Connection/SSH panel.
         */
        ctrl_settitle(b, "Connection/SSH",
                      "Options controlling SSH connections");

        if (midsession && protcfginfo == 1) {
            s = ctrl_getset(b, "Connection/SSH", "disclaimer", NULL);
            ctrl_text(s, "Nothing on this panel may be reconfigured in mid-"
                      "session; it is only here so that sub-panels of it can "
                      "exist without looking strange.", HELPCTX(no_help));
        }

        if (!midsession) {

            s = ctrl_getset(b, "Connection/SSH", "data",
                            "Data to send to the server");
            ctrl_editbox(s, "Remote command:", 'r', 100,
                         HELPCTX(ssh_command),
                         dlg_stdeditbox_handler, I(offsetof(Config,remote_cmd)),
                         I(sizeof(((Config *)0)->remote_cmd)));

            s = ctrl_getset(b, "Connection/SSH", "protocol", "Protocol options");
            ctrl_checkbox(s, "Don't start a shell or command at all", 'n',
                          HELPCTX(ssh_noshell),
                          dlg_stdcheckbox_handler,
                          I(offsetof(Config,ssh_no_shell)));
        }

        if (!midsession || protcfginfo != 1) {
            s = ctrl_getset(b, "Connection/SSH", "protocol", "Protocol options");

            ctrl_checkbox(s, "Enable compression", 'e',
                          HELPCTX(ssh_compress),
                          dlg_stdcheckbox_handler,
                          I(offsetof(Config,compression)));
        }

        if (!midsession) {
            s = ctrl_getset(b, "Connection/SSH", "protocol", "Protocol options");

            ctrl_radiobuttons(s, "Preferred SSH protocol version:", NO_SHORTCUT, 4,
                              HELPCTX(ssh_protocol),
                              dlg_stdradiobutton_handler,
                              I(offsetof(Config, sshprot)),
                              "1 only", 'l', I(0),
                              "1", '1', I(1),
                              "2", '2', I(2),
                              "2 only", 'y', I(3), NULL);
        }

        if (!midsession || protcfginfo != 1) {
            s = ctrl_getset(b, "Connection/SSH", "encryption", "Encryption options");
            c = ctrl_draglist(s, "Encryption cipher selection policy:", 's',
                              HELPCTX(ssh_ciphers),
                              cipherlist_handler, P(NULL));
            c->listbox.height = 6;

            ctrl_checkbox(s, "Enable legacy use of single-DES in SSH-2", 'i',
                          HELPCTX(ssh_ciphers),
                          dlg_stdcheckbox_handler,
                          I(offsetof(Config,ssh2_des_cbc)));
        }

        /*
         * The Connection/SSH/Kex panel. (Owing to repeat key
         * exchange, this is all meaningful in mid-session _if_
         * we're using SSH-2 or haven't decided yet.)
         */
        if (protcfginfo != 1) {
            ctrl_settitle(b, "Connection/SSH/Kex",
                          "Options controlling SSH key exchange");

            s = ctrl_getset(b, "Connection/SSH/Kex", "main",
                            "Key exchange algorithm options");
            c = ctrl_draglist(s, "Algorithm selection policy:", 's',
                              HELPCTX(ssh_kexlist),
                              kexlist_handler, P(NULL));
            c->listbox.height = 5;

            s = ctrl_getset(b, "Connection/SSH/Kex", "repeat",
                            "Options controlling key re-exchange");

            ctrl_editbox(s, "Max minutes before rekey (0 for no limit)", 't', 20,
                         HELPCTX(ssh_kex_repeat),
                         dlg_stdeditbox_handler,
                         I(offsetof(Config,ssh_rekey_time)),
                         I(-1));
            ctrl_editbox(s, "Max data before rekey (0 for no limit)", 'x', 20,
                         HELPCTX(ssh_kex_repeat),
                         dlg_stdeditbox_handler,
                         I(offsetof(Config,ssh_rekey_data)),
                         I(16));
            ctrl_text(s, "(Use 1M for 1 megabyte, 1G for 1 gigabyte etc)",
                      HELPCTX(ssh_kex_repeat));
        }

        if (!midsession) {

            /*
             * The Connection/SSH/Auth panel.
             */
            ctrl_settitle(b, "Connection/SSH/Auth",
                          "Options controlling SSH authentication");

            s = ctrl_getset(b, "Connection/SSH/Auth", "main", NULL);
            ctrl_checkbox(s, "Bypass authentication entirely (SSH-2 only)", 'b',
                          HELPCTX(ssh_auth_bypass),
                          dlg_stdcheckbox_handler,
                          I(offsetof(Config,ssh_no_userauth)));

            s = ctrl_getset(b, "Connection/SSH/Auth", "methods",
                            "Authentication methods");
            ctrl_checkbox(s, "Attempt authentication using Pageant", 'p',
                          HELPCTX(ssh_auth_pageant),
                          dlg_stdcheckbox_handler,
                          I(offsetof(Config,tryagent)));
            ctrl_checkbox(s, "Attempt TIS or CryptoCard auth (SSH-1)", 'm',
                          HELPCTX(ssh_auth_tis),
                          dlg_stdcheckbox_handler,
                          I(offsetof(Config,try_tis_auth)));
            ctrl_checkbox(s, "Attempt \"keyboard-interactive\" auth (SSH-2)",
                          'i', HELPCTX(ssh_auth_ki),
                          dlg_stdcheckbox_handler,
                          I(offsetof(Config,try_ki_auth)));

#ifndef NO_GSSAPI
            ctrl_checkbox(s, "Attempt GSSAPI auth (SSH-2)",
                          NO_SHORTCUT, HELPCTX(no_help),
                          dlg_stdcheckbox_handler,
                          I(offsetof(Config,try_gssapi_auth)));
#endif

            s = ctrl_getset(b, "Connection/SSH/Auth", "params",
                            "Authentication parameters");
            ctrl_checkbox(s, "Allow agent forwarding", 'f',
                          HELPCTX(ssh_auth_agentfwd),
                          dlg_stdcheckbox_handler, I(offsetof(Config,agentfwd)));
            ctrl_checkbox(s, "Allow attempted changes of username in SSH-2", 'u',
                          HELPCTX(ssh_auth_changeuser),
                          dlg_stdcheckbox_handler,
                          I(offsetof(Config,change_username)));
#ifndef NO_GSSAPI
            ctrl_checkbox(s, "Allow GSSAPI credential delegation in SSH-2", NO_SHORTCUT,
                          HELPCTX(no_help),
                          dlg_stdcheckbox_handler,
                          I(offsetof(Config,gssapifwd)));
#endif
            ctrl_filesel(s, "Private key file for authentication:", 'k',
                         FILTER_KEY_FILES, FALSE, "Select private key file",
                         HELPCTX(ssh_auth_privkey),
                         dlg_stdfilesel_handler, I(offsetof(Config, keyfile)));
        }

        if (!midsession) {
            /*
             * The Connection/SSH/TTY panel.
             */
            ctrl_settitle(b, "Connection/SSH/TTY", "Remote terminal settings");

            s = ctrl_getset(b, "Connection/SSH/TTY", "sshtty", NULL);
            ctrl_checkbox(s, "Don't allocate a pseudo-terminal", 'p',
                          HELPCTX(ssh_nopty),
                          dlg_stdcheckbox_handler,
                          I(offsetof(Config,nopty)));

            s = ctrl_getset(b, "Connection/SSH/TTY", "ttymodes",
                            "Terminal modes");
            td = (struct ttymodes_data *)
                ctrl_alloc(b, sizeof(struct ttymodes_data));
            ctrl_columns(s, 2, 75, 25);
            c = ctrl_text(s, "Terminal modes to send:", HELPCTX(ssh_ttymodes));
            c->generic.column = 0;
            td->rembutton = ctrl_pushbutton(s, "Remove", 'r',
                                            HELPCTX(ssh_ttymodes),
                                            ttymodes_handler, P(td));
            td->rembutton->generic.column = 1;
            td->rembutton->generic.tabdelay = 1;
            ctrl_columns(s, 1, 100);
            td->listbox = ctrl_listbox(s, NULL, NO_SHORTCUT,
                                       HELPCTX(ssh_ttymodes),
                                       ttymodes_handler, P(td));
            td->listbox->listbox.multisel = 1;
            td->listbox->listbox.height = 4;
            td->listbox->listbox.ncols = 2;
            td->listbox->listbox.percentages = snewn(2, int);
            td->listbox->listbox.percentages[0] = 40;
            td->listbox->listbox.percentages[1] = 60;
            ctrl_tabdelay(s, td->rembutton);
            ctrl_columns(s, 2, 75, 25);
            td->modelist = ctrl_droplist(s, "Mode:", 'm', 67,
                                         HELPCTX(ssh_ttymodes),
                                         ttymodes_handler, P(td));
            td->modelist->generic.column = 0;
            td->addbutton = ctrl_pushbutton(s, "Add", 'd',
                                            HELPCTX(ssh_ttymodes),
                                            ttymodes_handler, P(td));
            td->addbutton->generic.column = 1;
            td->addbutton->generic.tabdelay = 1;
            ctrl_columns(s, 1, 100);        /* column break */
            /* Bit of a hack to get the value radio buttons and
             * edit-box on the same row. */
            ctrl_columns(s, 3, 25, 50, 25);
            c = ctrl_text(s, "Value:", HELPCTX(ssh_ttymodes));
            c->generic.column = 0;
            td->valradio = ctrl_radiobuttons(s, NULL, NO_SHORTCUT, 2,
                                             HELPCTX(ssh_ttymodes),
                                             ttymodes_handler, P(td),
                                             "Auto", NO_SHORTCUT, P(NULL),
                                             "This:", NO_SHORTCUT, P(NULL),
                                             NULL);
            td->valradio->generic.column = 1;
            td->valbox = ctrl_editbox(s, NULL, NO_SHORTCUT, 100,
                                      HELPCTX(ssh_ttymodes),
                                      ttymodes_handler, P(td), P(NULL));
            td->valbox->generic.column = 2;
            ctrl_tabdelay(s, td->addbutton);

        }

        if (!midsession) {
            /*
             * The Connection/SSH/X11 panel.
             */
            ctrl_settitle(b, "Connection/SSH/X11",
                          "Options controlling SSH X11 forwarding");

            s = ctrl_getset(b, "Connection/SSH/X11", "x11", "X11 forwarding");
            ctrl_checkbox(s, "Enable X11 forwarding", 'e',
                          HELPCTX(ssh_tunnels_x11),
                          dlg_stdcheckbox_handler,I(offsetof(Config,x11_forward)));
            ctrl_editbox(s, "X display location", 'x', 50,
                         HELPCTX(ssh_tunnels_x11),
                         dlg_stdeditbox_handler, I(offsetof(Config,x11_display)),
                         I(sizeof(((Config *)0)->x11_display)));
            ctrl_radiobuttons(s, "Remote X11 authentication protocol", 'u', 2,
                              HELPCTX(ssh_tunnels_x11auth),
                              dlg_stdradiobutton_handler,
                              I(offsetof(Config, x11_auth)),
                              "MIT-Magic-Cookie-1", I(X11_MIT),
                              "XDM-Authorization-1", I(X11_XDM), NULL);
        }

        /*
         * The Tunnels panel _is_ still available in mid-session.
         */
        ctrl_settitle(b, "Connection/SSH/Tunnels",
                      "Options controlling SSH port forwarding");

        s = ctrl_getset(b, "Connection/SSH/Tunnels", "portfwd",
                        "Port forwarding");
        ctrl_checkbox(s, "Local ports accept connections from other hosts",'t',
                      HELPCTX(ssh_tunnels_portfwd_localhost),
                      dlg_stdcheckbox_handler,
                      I(offsetof(Config,lport_acceptall)));
        ctrl_checkbox(s, "Remote ports do the same (SSH-2 only)", 'p',
                      HELPCTX(ssh_tunnels_portfwd_localhost),
                      dlg_stdcheckbox_handler,
                      I(offsetof(Config,rport_acceptall)));

        ctrl_columns(s, 3, 55, 20, 25);
        c = ctrl_text(s, "Forwarded ports:", HELPCTX(ssh_tunnels_portfwd));
        c->generic.column = COLUMN_FIELD(0,2);
        /* You want to select from the list, _then_ hit Remove. So tab order
         * should be that way round. */
        pfd = (struct portfwd_data *)ctrl_alloc(b,sizeof(struct portfwd_data));
        pfd->rembutton = ctrl_pushbutton(s, "Remove", 'r',
                                         HELPCTX(ssh_tunnels_portfwd),
                                         portfwd_handler, P(pfd));
        pfd->rembutton->generic.column = 2;
        pfd->rembutton->generic.tabdelay = 1;
        pfd->listbox = ctrl_listbox(s, NULL, NO_SHORTCUT,
                                    HELPCTX(ssh_tunnels_portfwd),
                                    portfwd_handler, P(pfd));
        pfd->listbox->listbox.height = 3;
        pfd->listbox->listbox.ncols = 2;
        pfd->listbox->listbox.percentages = snewn(2, int);
        pfd->listbox->listbox.percentages[0] = 20;
        pfd->listbox->listbox.percentages[1] = 80;
        ctrl_tabdelay(s, pfd->rembutton);
        ctrl_text(s, "Add new forwarded port:", HELPCTX(ssh_tunnels_portfwd));
        /* You want to enter source, destination and type, _then_ hit Add.
         * Again, we adjust the tab order to reflect this. */
        pfd->addbutton = ctrl_pushbutton(s, "Add", 'd',
                                         HELPCTX(ssh_tunnels_portfwd),
                                         portfwd_handler, P(pfd));
        pfd->addbutton->generic.column = 2;
        pfd->addbutton->generic.tabdelay = 1;
        pfd->sourcebox = ctrl_editbox(s, "Source port", 's', 40,
                                      HELPCTX(ssh_tunnels_portfwd),
                                      portfwd_handler, P(pfd), P(NULL));
        pfd->sourcebox->generic.column = 0;
        pfd->destbox = ctrl_editbox(s, "Destination", 'i', 67,
                                    HELPCTX(ssh_tunnels_portfwd),
                                    portfwd_handler, P(pfd), P(NULL));
        pfd->direction = ctrl_radiobuttons(s, NULL, NO_SHORTCUT, 3,
                                           HELPCTX(ssh_tunnels_portfwd),
                                           portfwd_handler, P(pfd),
                                           "Local", 'l', P(NULL),
                                           "Remote", 'm', P(NULL),
                                           "Dynamic", 'y', P(NULL),
                                           NULL);
#ifndef NO_IPV6
        pfd->addressfamily =
            ctrl_radiobuttons(s, NULL, NO_SHORTCUT, 3,
                              HELPCTX(ssh_tunnels_portfwd_ipversion),
                              portfwd_handler, P(pfd),
                              "Auto", 'u', I(ADDRTYPE_UNSPEC),
                              "IPv4", '4', I(ADDRTYPE_IPV4),
                              "IPv6", '6', I(ADDRTYPE_IPV6),
                              NULL);
#endif
        ctrl_tabdelay(s, pfd->addbutton);
        ctrl_columns(s, 1, 100);

        if (!midsession) {
            /*
             * The Connection/SSH/Bugs panel.
             */
            ctrl_settitle(b, "Connection/SSH/Bugs",
                          "Workarounds for SSH server bugs");

            s = ctrl_getset(b, "Connection/SSH/Bugs", "main",
                            "Detection of known bugs in SSH servers");
            ctrl_droplist(s, "Chokes on SSH-1 ignore messages", 'i', 20,
                          HELPCTX(ssh_bugs_ignore1),
                          sshbug_handler, I(offsetof(Config,sshbug_ignore1)));
            ctrl_droplist(s, "Refuses all SSH-1 password camouflage", 's', 20,
                          HELPCTX(ssh_bugs_plainpw1),
                          sshbug_handler, I(offsetof(Config,sshbug_plainpw1)));
            ctrl_droplist(s, "Chokes on SSH-1 RSA authentication", 'r', 20,
                          HELPCTX(ssh_bugs_rsa1),
                          sshbug_handler, I(offsetof(Config,sshbug_rsa1)));
            ctrl_droplist(s, "Miscomputes SSH-2 HMAC keys", 'm', 20,
                          HELPCTX(ssh_bugs_hmac2),
                          sshbug_handler, I(offsetof(Config,sshbug_hmac2)));
            ctrl_droplist(s, "Miscomputes SSH-2 encryption keys", 'e', 20,
                          HELPCTX(ssh_bugs_derivekey2),
                          sshbug_handler, I(offsetof(Config,sshbug_derivekey2)));
            ctrl_droplist(s, "Requires padding on SSH-2 RSA signatures", 'p', 20,
                          HELPCTX(ssh_bugs_rsapad2),
                          sshbug_handler, I(offsetof(Config,sshbug_rsapad2)));
            ctrl_droplist(s, "Misuses the session ID in SSH-2 PK auth", 'n', 20,
                          HELPCTX(ssh_bugs_pksessid2),
                          sshbug_handler, I(offsetof(Config,sshbug_pksessid2)));
            ctrl_droplist(s, "Handles SSH-2 key re-exchange badly", 'k', 20,
                          HELPCTX(ssh_bugs_rekey2),
                          sshbug_handler, I(offsetof(Config,sshbug_rekey2)));
            ctrl_droplist(s, "Ignores SSH-2 maximum packet size", 'x', 20,
                          HELPCTX(ssh_bugs_maxpkt2),
                          sshbug_handler, I(offsetof(Config,sshbug_maxpkt2)));
        }
    }
}