Add Joerg's user management screen for David Nugent's pw(8) program, something

which will also need to be brought in before this screen will work.

Add some commentary about how the slip startup code is bogus.

Steal Joerg's loop for more properly closing all files and graft it into
the EHS startup.  My loop was functional but more bogus.

1 files changed, 750 insertions, 0 deletions

diff --git a/usr.sbin/sysinstall/user.c b/usr.sbin/sysinstall/user.c
new file mode 100644
index 0000000..e87ac7c
--- /dev/null
+++ b/usr.sbin/sysinstall/user.c
@@ -0,0 +1,750 @@
+/*
+ * $Id$
+ *
+ * Copyright (c) 1996
+ *      Jörg Wunsch. All rights reserved.
+ *
+ * The basic structure has been taken from tcpip.c, which is:
+ *
+ * Copyright (c) 1995
+ *      Gary J Palmer. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer,
+ *    verbatim and that no modifications are made prior to this
+ *    point in the file.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, LIFE OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/param.h>
+#include <string.h>
+#include <dialog.h>
+#include "ui_objects.h"
+#include "dir.h"
+#include "dialog.priv.h"
+#include "colors.h"
+#include "sysinstall.h"
+
+/* The help file for the user mgmt screen */
+#define USER_HELPFILE		"usermgmt"
+
+/* XXX should they be moved out to sysinstall.h? */
+#define GNAME_FIELD_LEN 32
+#define GID_FIELD_LEN 10
+#define GMEMB_FIELD_LEN 64
+
+#define UNAME_FIELD_LEN 32
+#define UID_FIELD_LEN 10
+#define UGROUP_FIELD_LEN GNAME_FIELD_LEN
+#define GECOS_FIELD_LEN 64
+#define UMEMB_FIELD_LEN GMEMB_FIELD_LEN
+#define HOMEDIR_FIELD_LEN 48
+#define SHELL_FIELD_LEN 48
+
+/* These are nasty, but they make the layout structure a lot easier ... */
+
+static char gname[GNAME_FIELD_LEN],
+	gid[GID_FIELD_LEN],
+	gmemb[GMEMB_FIELD_LEN],
+	uname[UNAME_FIELD_LEN],
+	uid[UID_FIELD_LEN],
+	ugroup[UGROUP_FIELD_LEN],
+	gecos[GECOS_FIELD_LEN],
+	umemb[UMEMB_FIELD_LEN],
+	homedir[HOMEDIR_FIELD_LEN],
+	shell[SHELL_FIELD_LEN];
+#define CLEAR(v)	memset(v, 0, sizeof v)
+
+static int	okbutton, cancelbutton;
+
+
+/* What the screen size is meant to be */
+#define USER_DIALOG_Y		0
+#define USER_DIALOG_X		8
+#define USER_DIALOG_WIDTH	COLS - 16
+#define USER_DIALOG_HEIGHT	LINES - 2
+
+/* The screen layout structure */
+typedef struct _layout {
+    int		y;		/* x & Y co-ordinates */
+    int		x;
+    int		len;		/* The size of the dialog on the screen */
+    int		maxlen;		/* How much the user can type in ... */
+    char	*prompt;	/* The string for the prompt */
+    char	*help;		/* The display for the help line */
+    void	*var;		/* The var to set when this changes */
+    int		type;		/* The type of the dialog to create */
+    void	*obj;		/* The obj pointer returned by libdialog */
+} Layout;
+
+/* The group configuration menu. */
+static Layout groupLayout[] = {
+{ 4, 10, 20, GNAME_FIELD_LEN - 1,
+	"Group name:", "The alphanumeric name of the new group (mandatory)",
+	gname, STRINGOBJ, NULL },
+#define LAYOUT_GNAME		0
+{ 4, 38, 10, GID_FIELD_LEN - 1,
+	"GID:", "The numerical ID for this group (leave blank for automatic choice)",
+	gid, STRINGOBJ, NULL },
+#define LAYOUT_GID		1
+{ 11, 10, 40, GMEMB_FIELD_LEN - 1,
+	"Group members:", "Who belongs to this group (i.e., gets access rights for it)",
+	gmemb, STRINGOBJ, NULL },
+#define LAYOUT_GMEMB		2
+{ 18, 15, 0, 0,
+	"OK", "Select this if you are happy with these settings",
+	&okbutton, BUTTONOBJ, NULL },
+#define LAYOUT_OKBUTTON		3
+{ 18, 35, 0, 0,
+	"CANCEL", "Select this if you wish to cancel this screen",
+	&cancelbutton, BUTTONOBJ, NULL },
+#define LAYOUT_CANCELBUTTON	4
+
+{ NULL },
+};
+
+/* The user configuration menu. */
+static Layout userLayout[] = {
+{ 3, 6, 20, UNAME_FIELD_LEN - 1,
+	"Login ID:", "The login name of the new user (mandatory)",
+	uname, STRINGOBJ, NULL },
+#define LAYOUT_UNAME		0
+{ 3, 29, 10, UID_FIELD_LEN - 1,
+	"UID:", "The numerical ID for this user (leave blank for automatic choice)",
+	uid, STRINGOBJ, NULL },
+#define LAYOUT_UID		1
+{ 3, 43, 15, UGROUP_FIELD_LEN - 1,
+	"Group:", "The login group name for this user (mandatory)",
+	ugroup, STRINGOBJ, NULL },
+#define LAYOUT_UGROUP		2
+{ 8, 6, 33, GECOS_FIELD_LEN - 1,
+	"Full name:", "The user's full name (comment)",
+	gecos, STRINGOBJ, NULL },
+#define LAYOUT_GECOS		3
+{ 8, 43, 15, UMEMB_FIELD_LEN - 1,
+	"Member groups:", "The groups this user belongs to (i.e. gets access rights for)",
+	umemb, STRINGOBJ, NULL },
+#define LAYOUT_UMEMB		4
+{ 13, 6, 20, HOMEDIR_FIELD_LEN - 1,
+	"Home directory:", "The user's home directory (leave blank for default)",
+	homedir, STRINGOBJ, NULL },
+#define LAYOUT_HOMEDIR		5
+{ 13, 29, 29, SHELL_FIELD_LEN - 1,
+	"Login shell:", "The user's login shell (leave blank for default)",
+	shell, STRINGOBJ, NULL },
+#define LAYOUT_SHELL		6
+{ 18, 15, 0, 0,
+	"OK", "Select this if you are happy with these settings",
+	&okbutton, BUTTONOBJ, NULL },
+#define LAYOUT_U_OKBUTTON	7
+{ 18, 35, 0, 0,
+	"CANCEL", "Select this if you wish to cancel this screen",
+	&cancelbutton, BUTTONOBJ, NULL },
+#define LAYOUT_U_CANCELBUTTON	8
+
+{ NULL },
+};
+
+/* whine */
+static void
+feepout(char *msg)
+{
+    beep();
+    dialog_notify(msg);
+}
+
+/* Check for the settings on the screen. */
+
+static int
+verifyGroupSettings(void)
+{
+    char tmp[256], *cp;
+    long lgid;
+
+    if (strlen(gname) == 0) {
+	feepout("The group name field must not be empty!");
+	return 0;
+    }
+    snprintf(tmp, 256, "pw group show -q -n %s > /dev/null", gname);
+    if (vsystem(tmp) == 0) {
+	feepout("This group name is already in use.");
+	return 0;
+    }
+    if (strlen(gid) > 0) {
+	lgid = strtol(gid, &cp, 10);
+	if (lgid < 0 || lgid >= 65536 || (*cp != '\0' && !isspace(*cp))) {
+	    feepout("The GID must be a number between 1 and 65535.");
+	    return 0;
+	}
+    }
+    if (strlen(gmemb) > 0) {
+	if (strpbrk(gmemb, " \t") != NULL) {
+	    feepout("The group member list must not contain any whitespace;\n"
+		    "use commas to separate the names.");
+	    return 0;
+	}
+#ifndef notyet  /* XXX */
+	feepout("Sorry, this feature is currently not yet implemented.\n");
+	return 0;
+#endif
+    }
+
+    return 1;
+}
+
+static void
+addGroup(WINDOW *ds_win)
+{
+    char tmp[256];
+    int pfd[2], i;
+    ssize_t l;
+    size_t amnt;
+    pid_t pid;
+    char *vec[8] =
+    {
+	"pw", "group", "add", "-n", 0, "-g", 0, 0
+    };
+#define VEC_GNAME 4
+#define VEC_GID 6
+
+    msgNotify("Adding group \"%s\"...", gname);
+
+    pipe (pfd);
+    if ((pid = fork()) == 0)
+    {
+	/* The kiddy. */
+	dup2(pfd[1], 1);
+	dup2(pfd[1], 2);
+	for (i = getdtablesize(); i > 2; i--)
+	    close(i);
+
+	vec[VEC_GNAME] = gname;
+
+	if (strlen(gid) > 0)
+	    vec[VEC_GID] = gid;
+	else
+	    vec[VEC_GID - 1] = 0;
+
+	chroot(variable_get(VAR_INSTALL_ROOT));
+	execv("/usr/sbin/pw", vec);
+	msgDebug("Cannot execv() /usr/sbin/pw.\n");
+	_exit(99);
+    }
+    else
+    {
+	/* The oldie. */
+	close(pfd[1]);
+	amnt = sizeof tmp;
+	i = 0;
+	while((l = read(pfd[0], &tmp[i], amnt)) > 0)
+	{
+	    amnt -= l;
+	    i += l;
+	    if (amnt == 0)
+	    {
+		close(pfd[0]);
+		break;
+	    }
+	}
+	close(pfd[0]);
+	tmp[i] = '\0';
+	waitpid(pid, &i, 0);
+	if (WIFSIGNALED(i))
+	    msgDebug("pw(8) exited with signal %d.\n", WTERMSIG(i));
+	else if(WEXITSTATUS(i))
+	{
+	    i = 0;
+	    if(strncmp(tmp, "pw: ", 4) == 0)
+		i = 4;
+	    tmp[sizeof tmp - 1] = '\0';	/* sanity */
+	    msgConfirm("The `pw' command exited with an error status.\n"
+		       "Its error message was:\n\n%s",
+		       &tmp[i]);
+	}
+    }
+}
+
+int
+userAddGroup(dialogMenuItem *self)
+{
+    WINDOW              *ds_win, *save;
+    ComposeObj          *obj = NULL;
+    ComposeObj		*first, *last;
+    int                 n=0, quit=FALSE, cancel=FALSE, ret;
+    int			max;
+    char		help[FILENAME_MAX];
+
+    if (RunningAsInit && !strstr(variable_get(SYSTEM_STATE), "install")) {
+        msgConfirm("This option may only be used after the system is installed, sorry!");
+        return DITEM_FAILURE;
+    }
+
+    save = savescr();
+    dialog_clear_norefresh();
+    /* We need a curses window */
+    ds_win = newwin(LINES, COLS, 0, 0);
+    if (ds_win == 0)
+	msgFatal("Cannot open AddGroup dialog window!!");
+
+    /* Say where our help comes from */
+    use_helpfile(systemHelpFile(USER_HELPFILE, help));
+
+    /* Setup a nice screen for us to splat stuff onto */
+    draw_box(ds_win, USER_DIALOG_Y, USER_DIALOG_X, USER_DIALOG_HEIGHT, USER_DIALOG_WIDTH,
+	     dialog_attr, border_attr);
+    wattrset(ds_win, dialog_attr);
+    mvwaddstr(ds_win, USER_DIALOG_Y, USER_DIALOG_X + 18, " Users and Group Management ");
+    draw_box(ds_win, USER_DIALOG_Y + 2, USER_DIALOG_X + 8, USER_DIALOG_HEIGHT - 6,
+	     USER_DIALOG_WIDTH - 17, dialog_attr, border_attr);
+    wattrset(ds_win, dialog_attr);
+    mvwaddstr(ds_win, USER_DIALOG_Y + 2, USER_DIALOG_X + 22, " Add a new group ");
+
+    CLEAR(gname);
+    CLEAR(gid);
+    CLEAR(gmemb);
+
+    /* Loop over the layout list, create the objects, and add them
+       onto the chain of objects that dialog uses for traversal*/
+    n = 0;
+#define lt groupLayout[n]
+    while (lt.help != NULL) {
+	switch (lt.type) {
+	case STRINGOBJ:
+	    lt.obj = NewStringObj(ds_win, lt.prompt, lt.var,
+				  lt.y + USER_DIALOG_Y, lt.x + USER_DIALOG_X,
+				  lt.len, lt.maxlen);
+	    break;
+
+	case BUTTONOBJ:
+	    lt.obj = NewButtonObj(ds_win, lt.prompt, lt.var,
+				  lt.y + USER_DIALOG_Y, lt.x + USER_DIALOG_X);
+	    break;
+
+	default:
+	    msgFatal("Don't support this object yet!");
+	}
+	AddObj(&obj, lt.type, (void *) lt.obj);
+	n++;
+    }
+    max = n - 1;
+
+    /* Find the last object we can traverse to */
+    last = obj;
+    while (last->next)
+	last = last->next;
+
+    /* Find the first object in the list */
+    first = obj;
+    for (first = obj; first->prev; first = first->prev);
+
+    /* Some more initialisation before we go into the main input loop */
+    n = 0;
+    cancelbutton = okbutton = 0;
+
+    /* Incoming user data - DUCK! */
+    while (!quit) {
+	char help_line[80];
+	int i, len = strlen(lt.help);
+
+	/* Display the help line at the bottom of the screen */
+	for (i = 0; i < 79; i++)
+	    help_line[i] = (i < len) ? lt.help[i] : ' ';
+	help_line[i] = '\0';
+	use_helpline(help_line);
+	display_helpline(ds_win, LINES - 1, COLS - 1);
+
+	/* Ask for libdialog to do its stuff */
+	ret = PollObj(&obj);
+
+	/* Handle special case stuff that libdialog misses. Sigh */
+	switch (ret) {
+	    /* Bail out */
+	case SEL_ESC:
+	    quit = TRUE, cancel=TRUE;
+	    break;
+
+	    /* This doesn't work for list dialogs. Oh well. Perhaps
+	       should special case the move from the OK button ``up''
+	       to make it go to the interface list, but then it gets
+	       awkward for the user to go back and correct screw up's
+	       in the per-interface section */
+
+	case KEY_DOWN:
+	case SEL_TAB:
+	case SEL_CR:
+	    if (n < max)
+		++n;
+	    else
+		n = 0;
+	    break;
+
+	    /* The user has pressed enter over a button object */
+	case SEL_BUTTON:
+ 	    if (cancelbutton)
+		cancel = TRUE, quit = TRUE;
+	    else {
+		if (verifyGroupSettings())
+		    quit = TRUE;
+	    }
+	    break;
+
+	case KEY_UP:
+	case SEL_BACKTAB:
+	    if (n)
+		--n;
+	    else
+		n = max;
+	    break;
+
+	case KEY_F(1):
+	    display_helpfile();
+
+	    /* They tried some key combination we don't support - tell them! */
+	default:
+	    beep();
+	}
+    }
+#undef lt
+
+    /* Clear this crap off the screen */
+    dialog_clear_norefresh();
+    use_helpfile(NULL);
+
+    if (!cancel) {
+	addGroup(ds_win);
+	restorescr(save);
+	return DITEM_SUCCESS;
+    }
+    restorescr(save);
+    return DITEM_FAILURE;
+}
+
+/* Check for the settings on the screen. */
+
+static int
+verifyUserSettings(WINDOW *ds_win)
+{
+    char tmp[256], *cp;
+    long luid;
+    WINDOW *save;
+    int rv;
+
+    if (strlen(uname) == 0) {
+	feepout("The user name field must not be empty!");
+	return 0;
+    }
+    snprintf(tmp, 256, "pw user show -q -n %s > /dev/null", gname);
+    if (vsystem(tmp) == 0) {
+	feepout("This user name is already in use.");
+	return 0;
+    }
+    if (strlen(uid) > 0) {
+	luid = strtol(uid, &cp, 10);
+	if (luid < 0 || luid >= 65536 || (*cp != '\0' && !isspace(*cp))) {
+	    feepout("The UID must be a number between 1 and 65535.");
+	    return 0;
+	}
+    }
+    if (strlen(ugroup) == 0) {
+	feepout("The login group field must not be empty!");
+	return 0;
+    }
+    snprintf(tmp, 256, "pw group show -q -n %s > /dev/null", ugroup);
+    if (vsystem(tmp) != 0) {
+	feepout("This group name does not yet exist.");
+	return 0;
+    }
+    if (strlen(shell) > 0) {
+	while((cp = getusershell()) != NULL)
+	    if (strcmp(cp, shell) == 0)
+		break;
+	endusershell();
+	if (cp == NULL) {
+	    save = savescr();
+	    rv = msgYesNo("Warning:\n\n"
+			  "The requested shell \"%s\" is not\n"
+			  "a valid user shell.\n\n"
+			  "Use it anyway?\n", shell);
+	    restorescr(save);
+	    wrefresh(ds_win);
+	    if (rv != DITEM_SUCCESS)
+		return 0;
+	}
+	
+    }
+
+    if (strlen(umemb) > 0) {
+	if (strpbrk(umemb, " \t") != NULL) {
+	    feepout("The member groups list must not contain any whitespace;\n"
+		    "use commas to separate the names.");
+	    return 0;
+	}
+    }
+
+    return 1;
+}
+
+static void
+addUser(WINDOW *ds_win)
+{
+    char tmp[256];
+    int pfd[2], i;
+    ssize_t l;
+    size_t amnt;
+    pid_t pid;
+    /*
+     * Maximal list:
+     * pw user add -m -n uname -g grp -u uid -c comment -d homedir -s shell -G grplist
+     */
+    char *vec[18] =
+    {
+	"pw", "user", "add", "-m", "-n", /* ... */
+    };
+#define VEC_UNAME 5
+
+    msgNotify("Adding user \"%s\"...", uname);
+
+    pipe (pfd);
+    if ((pid = fork()) == 0)
+    {
+	/* The kiddy. */
+	dup2(pfd[1], 1);
+	dup2(pfd[1], 2);
+	for (i = getdtablesize(); i > 2; i--)
+	    close(i);
+
+	vec[i = VEC_UNAME] = uname;
+	i++;
+	vec[i++] = "-g";
+	vec[i++] = ugroup;
+#define ADDVEC(var, option) do { if (strlen(var) > 0) { vec[i++] = option; vec[i++] = var; } } while (0)
+	ADDVEC(uid, "-u");
+	ADDVEC(gecos, "-c");
+	ADDVEC(homedir, "-h");
+	ADDVEC(shell, "-s");
+	ADDVEC(umemb, "-G");
+	vec[i] = 0;
+
+	chroot(variable_get(VAR_INSTALL_ROOT));
+	execv("/usr/sbin/pw", vec);
+	msgDebug("Cannot execv() /usr/sbin/pw.\n");
+	_exit(99);
+    }
+    else
+    {
+	/* The oldie. */
+	close(pfd[1]);
+	amnt = sizeof tmp;
+	i = 0;
+	while((l = read(pfd[0], &tmp[i], amnt)) > 0)
+	{
+	    amnt -= l;
+	    i += l;
+	    if (amnt == 0)
+	    {
+		close(pfd[0]);
+		break;
+	    }
+	}
+	close(pfd[0]);
+	tmp[i] = '\0';
+	waitpid(pid, &i, 0);
+	if (WIFSIGNALED(i))
+	    msgDebug("pw(8) exited with signal %d.\n", WTERMSIG(i));
+	else if(WEXITSTATUS(i))
+	{
+	    i = 0;
+	    if(strncmp(tmp, "pw: ", 4) == 0)
+		i = 4;
+	    tmp[sizeof tmp - 1] = '\0';	/* sanity */
+	    msgConfirm("The `pw' command exited with an error status.\n"
+		       "Its error message was:\n\n%s",
+		       &tmp[i]);
+	}
+	else
+	    msgConfirm("You will need to enter a password for this user\n"
+		       "later, using the passwd(1) command from the shell.\n\n"
+		       "The account for `%s' is currently still disabled.",
+		       uname);
+    }
+}
+
+int
+userAddUser(dialogMenuItem *self)
+{
+    WINDOW              *ds_win, *save;
+    ComposeObj          *obj = NULL;
+    ComposeObj		*first, *last;
+    int                 n=0, quit=FALSE, cancel=FALSE, ret;
+    int			max;
+    char		help[FILENAME_MAX];
+
+    if (RunningAsInit && !strstr(variable_get(SYSTEM_STATE), "install")) {
+        msgConfirm("This option may only be used after the system is installed, sorry!");
+        return DITEM_FAILURE;
+    }
+
+    save = savescr();
+    dialog_clear_norefresh();
+    /* We need a curses window */
+    ds_win = newwin(LINES, COLS, 0, 0);
+    if (ds_win == 0)
+	msgFatal("Cannot open AddUser dialog window!!");
+
+    /* Say where our help comes from */
+    use_helpfile(systemHelpFile(USER_HELPFILE, help));
+
+    /* Setup a nice screen for us to splat stuff onto */
+    draw_box(ds_win, USER_DIALOG_Y, USER_DIALOG_X, USER_DIALOG_HEIGHT, USER_DIALOG_WIDTH,
+	     dialog_attr, border_attr);
+    wattrset(ds_win, dialog_attr);
+    mvwaddstr(ds_win, USER_DIALOG_Y, USER_DIALOG_X + 18, " Users and Group Management ");
+    draw_box(ds_win, USER_DIALOG_Y + 1, USER_DIALOG_X + 3, USER_DIALOG_HEIGHT - 5,
+	     USER_DIALOG_WIDTH - 6, dialog_attr, border_attr);
+    wattrset(ds_win, dialog_attr);
+    mvwaddstr(ds_win, USER_DIALOG_Y + 1, USER_DIALOG_X + 22, " Add a new user ");
+
+    CLEAR(uname);
+    CLEAR(uid);
+    CLEAR(ugroup);
+    CLEAR(gecos);
+    CLEAR(umemb);
+    CLEAR(homedir);
+    CLEAR(shell);
+    
+    /* Loop over the layout list, create the objects, and add them
+       onto the chain of objects that dialog uses for traversal*/
+    n = 0;
+#define lt userLayout[n]
+    while (lt.help != NULL) {
+	switch (lt.type) {
+	case STRINGOBJ:
+	    lt.obj = NewStringObj(ds_win, lt.prompt, lt.var,
+				  lt.y + USER_DIALOG_Y, lt.x + USER_DIALOG_X,
+				  lt.len, lt.maxlen);
+	    break;
+
+	case BUTTONOBJ:
+	    lt.obj = NewButtonObj(ds_win, lt.prompt, lt.var,
+				  lt.y + USER_DIALOG_Y, lt.x + USER_DIALOG_X);
+	    break;
+
+	default:
+	    msgFatal("Don't support this object yet!");
+	}
+	AddObj(&obj, lt.type, (void *) lt.obj);
+	n++;
+    }
+    max = n - 1;
+
+    /* Find the last object we can traverse to */
+    last = obj;
+    while (last->next)
+	last = last->next;
+
+    /* Find the first object in the list */
+    first = obj;
+    for (first = obj; first->prev; first = first->prev);
+
+    /* Some more initialisation before we go into the main input loop */
+    n = 0;
+    cancelbutton = okbutton = 0;
+
+    /* Incoming user data - DUCK! */
+    while (!quit) {
+	char help_line[80];
+	int i, len = strlen(lt.help);
+
+	/* Display the help line at the bottom of the screen */
+	for (i = 0; i < 79; i++)
+	    help_line[i] = (i < len) ? lt.help[i] : ' ';
+	help_line[i] = '\0';
+	use_helpline(help_line);
+	display_helpline(ds_win, LINES - 1, COLS - 1);
+
+	/* Ask for libdialog to do its stuff */
+	ret = PollObj(&obj);
+
+	/* Handle special case stuff that libdialog misses. Sigh */
+	switch (ret) {
+	    /* Bail out */
+	case SEL_ESC:
+	    quit = TRUE, cancel=TRUE;
+	    break;
+
+	    /* This doesn't work for list dialogs. Oh well. Perhaps
+	       should special case the move from the OK button ``up''
+	       to make it go to the interface list, but then it gets
+	       awkward for the user to go back and correct screw up's
+	       in the per-interface section */
+
+	case KEY_DOWN:
+	case SEL_TAB:
+	case SEL_CR:
+	    if (n < max)
+		++n;
+	    else
+		n = 0;
+	    break;
+
+	    /* The user has pressed enter over a button object */
+	case SEL_BUTTON:
+ 	    if (cancelbutton)
+		cancel = TRUE, quit = TRUE;
+	    else {
+		if (verifyUserSettings(ds_win))
+		    quit = TRUE;
+	    }
+	    break;
+
+	case KEY_UP:
+	case SEL_BACKTAB:
+	    if (n)
+		--n;
+	    else
+		n = max;
+	    break;
+
+	case KEY_F(1):
+	    display_helpfile();
+
+	    /* They tried some key combination we don't support - tell them! */
+	default:
+	    beep();
+	}
+    }
+#undef lt
+
+    /* Clear this crap off the screen */
+    dialog_clear_norefresh();
+    use_helpfile(NULL);
+
+    if (!cancel) {
+	addUser(ds_win);
+	restorescr(save);
+	return DITEM_SUCCESS;
+    }
+    restorescr(save);
+    return DITEM_FAILURE;
+}
+