commit message

.gitignore

@@ -4,15 +4,18 @@
 tmp/
 .ccls-cache/
 .deps/
+.directory
 
 autom4te.cache/
 build/
+build-aux/
 po/*.gmo
 po/Makefile
 po/Makefile.in
 po/POTFILES
 po/*.po~
 
+aclocal.m4
 config.h
 config.in
 config.status

README.md

@@ -3,3 +3,8 @@ A replacement for `/bin/login` which provides a friendly TUI greeter.
 
 *DISCLAIMER:* While I'm reasonably sure this program is secure, I can't
 guarantee that for certain. Use it at your own risk.
+
+## TODO
+- [ ] UTF-8 support
+- [ ] Respect `/etc/login.defs`
+- [ ] Appearance customization

hlogin.c

@@ -19,7 +19,6 @@
  */
 #include "config.h"
 
-#include <security/_pam_types.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdbool.h>
@@ -28,8 +27,12 @@
 #include "gettext.h"
 
 #include <unistd.h>
+#include <sys/types.h>
+#include <security/_pam_types.h>
 #include <security/pam_appl.h>
 #include <security/pam_misc.h>
+#include <syslog.h>
+#include <pwd.h>
 
 #include "ui.h"
 
@@ -88,16 +91,27 @@ FAILURE:
 	return PAM_CONV_ERR;
 }
 
+/** number of seconds to hang after a login failure or error **/
+unsigned int fail_delay = 3;
+
 int main(int argc, char* argv[])
 {
+	int result;
+
 	setlocale(LC_ALL, "");
 	bindtextdomain(PACKAGE, LOCALEDIR);
 	textdomain(PACKAGE);
 
+	openlog("hlogin", LOG_ODELAY, LOG_AUTHPRIV);
+
 	pam_handle_t *pam = NULL;
 	struct pam_conv conv = { .conv = pam_conv_handler, .appdata_ptr = NULL };
-	if (pam_start("login", NULL, &conv, &pam) != PAM_SUCCESS) {
-		// TODO log error & pause before exiting
+
+	result = pam_start("login", NULL, &conv, &pam);
+	if (result != PAM_SUCCESS) {
+		syslog(LOG_ERR, _("Couldn't initialize PAM: %s"), pam_strerror(pam, result));
+		fprintf(stderr, _("pam_start error: %s. Abort.\n"), pam_strerror(pam, result));
+		sleep(fail_delay);
 		return EXIT_FAILURE;
 	}
 
@@ -105,7 +119,7 @@ int main(int argc, char* argv[])
 
 	// prompt for username
 	ui_setup_dialog(_("Login name:"), false);
-	int result = ui_run();
+	result = ui_run();
 	char *login_name = ui_get_text();
 	if (result != 0)
 		goto END;

ui.c

@@ -20,7 +20,6 @@
 #include "config.h"
 #include "ui.h"
 
-#include <panel.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdbool.h>
@@ -47,6 +46,12 @@ PANEL  *login_p;
 WINDOW *login_shadow_w;
 PANEL  *login_shadow_p;
 
+WINDOW *error_w;
+PANEL  *error_p;
+
+WINDOW *error_shadow_w;
+PANEL  *error_shadow_p;
+
 const int login_rows = 8;
 const int login_cols = 48;
 
@@ -115,6 +120,7 @@ FAILURE:
 	return unknown_str;
 }
 
+/*
 char *xgetnisdomainname()
 {
 	size_t len = HOST_NAME_MAX;
@@ -136,6 +142,7 @@ char *xgetnisdomainname()
 	buf[len] = '\0';
 	return buf;
 }
+*/
 
 char erase_ch;
 
@@ -154,6 +161,16 @@ void ui_setup_dialog(char *prompt, bool password)
 	paint_login();
 }
 
+void ui_setup_message(char *text)
+{
+	msg = text;
+	// TODO insert word wrap logic here
+	int msg_len = strlen(text);
+
+
+
+}
+
 /** ui_init - initialize the UI subsystem
  */
 void ui_init()
@@ -250,9 +267,9 @@ void paint_login()
 	wmove(login_w, 3, 3);
 	whline(login_w, ' ', login_cols - 6);
 	if (!hide_input)
-		waddnstr(login_w, input_buf, login_cols - 6);
+		waddnstr(login_w, input_buf + input_scroll, login_cols - 6);
 	else {
-		int num_dots = strlen(input_buf);
+		int num_dots = strlen(input_buf) - input_scroll;
 		if (num_dots > login_cols - 6)
 			num_dots = login_cols - 6;
 		whline(login_w, '*', num_dots);
@@ -275,7 +292,7 @@ void paint_login()
 int ui_update()
 {
 	paint_back();
-	wmove(login_w, 3, 3 + input_pos);
+	wmove(login_w, 3, 3 + input_pos - input_scroll);
 
 	update_panels();
 	doupdate();
@@ -290,11 +307,15 @@ int ui_update()
 		input_backdel_char();
 	else if (ch == 0x7F || ch == KEY_DC)
 		input_del_char();
-	else if (ch == KEY_LEFT && input_pos > 0)
+	else if (ch == KEY_LEFT && input_pos > 0) {
 		input_pos--;
-	else if (ch == KEY_RIGHT && input_pos < strlen(input_buf))
+		if (input_pos < input_scroll)
+			input_scroll--;
+	} else if (ch == KEY_RIGHT && input_pos < strlen(input_buf)) {
 		input_pos++;
-	else if (ch == '\t')
+		if (input_pos >= (input_scroll + login_cols - 6))
+			input_scroll++;
+	} else if (ch == '\t')
 		btn_focus = (btn_focus + 1) % btn_count;
 	else if (ch == 0x1B) // escape
 		return -2;
@@ -336,6 +357,8 @@ void input_add_char(char ch)
 		if (input_buf[i] == '\0')
 			break;
 	}
+	if (input_pos >= (input_scroll + login_cols - 6))
+		input_scroll++;
 }
 
 void input_backdel_char()
@@ -351,11 +374,13 @@ void input_del_char()
 	if (input_buf[input_pos] == '\0')
 		return;
 
-	for (int i = input_pos; i < (input_buflen - 1); i++) {
+	for (int i = input_pos; i < input_buflen - 1; i++) {
 		input_buf[i] = input_buf[i + 1];
 		if (input_buf[i] == '\0')
 			break;
 	}
+	if ((input_scroll + login_cols - 6) > strlen(input_buf) && input_scroll > 0)
+		input_scroll--;
 }
 
 const attr_t light = A_BOLD | COLOR_PAIR(3);
@@ -383,3 +408,118 @@ void draw_outline(WINDOW *win, int height, int width, int y, int x, bool inset)
 
 	wattroff(win, A_ALTCHARSET);
 }
+
+/** output_word - used in word_wrap
+ */
+void output_word(char *word, size_t len,
+		 char **out, size_t *out_size, int *out_pos,
+		 int *line_pos, int *lines, int width)
+{
+	int i = 0;
+	while (i < len) {
+		int space = width - (*line_pos);
+		int remain = len - i;
+		if (space > remain) { // can fit on line
+			if ((*out_size) < (*out_pos) + remain) {
+				*out_size *= 2;
+				*out = realloc(*out, sizeof(char) * (*out_size));
+			}
+			// copy word
+			memcpy((*out) + (*out_pos), word + i, sizeof(char) * remain);
+			i += remain;
+			*out_pos += remain;
+			*line_pos += remain;
+		} else {
+			if ((*out_size) < (*out_pos) + space + 1) {
+				*out_size *= 2;
+				*out = realloc(*out, sizeof(char) * (*out_size));
+			}
+			// copy part of word
+			memcpy((*out) + (*out_pos), word + i, sizeof(char) * space);
+			i += space;
+			*out_pos += space;
+			// add newline
+			(*out)[(*out_pos)++] = '\n';
+			*line_pos = 0;
+			(*lines)++;
+		}
+	}
+}
+
+char *word_wrap(char *text, int width, int max_word, int *lines)
+{
+	// output buffer
+	size_t out_size = 256;
+	char *out = malloc(sizeof(char) * out_size);
+	int out_pos = 0;
+	// word buffer
+	char *word = malloc(sizeof(char) * max_word);
+	int word_len = 0;
+
+	int line_pos = 0;
+
+	char ch;
+	while ((ch = *text) != '\0') {
+		text++;
+
+		switch (ch) {
+			case '\n':
+			case ' ':
+				if (word[0] == '\0')
+					word_len = 0;
+				// ensure buffer is large enough
+				if (out_size < out_pos + word_len + 2) {
+					out_size *= 2;
+					out = realloc(out, sizeof(char) * out_size);
+				}
+				if (word_len > 0) {
+					// do we have to wrap to a new line?
+					if (line_pos + word_len > width) {
+						out[out_pos++] = '\n';
+						line_pos = 0;
+						(*lines)++;
+					}
+					memcpy(out + out_pos, word, sizeof(char) * word_len);
+					word_len = 0;
+					out_pos += word_len;
+					line_pos += word_len;
+				}
+				// output \n
+				if (ch == '\n' || line_pos >= width) {
+					out[out_pos++] = '\n';
+					line_pos = 0;
+					(*lines)++;
+				} else {
+					out[out_pos++] = ' ';
+					line_pos++;
+				}
+				break;
+			default:
+				// word longer than word buffer
+				if (word_len >= max_word) {
+					if (word[0] != '\0') {
+						// write what we have
+						output_word(word, word_len,
+							    &out, &out_size, &out_pos,
+							    &line_pos, lines, width);
+						word[0] = '\0';
+					}
+					// ensure buffer is large enough
+					if (out_size < out_pos + 2) {
+						out_size *= 2;
+						out = realloc(out, sizeof(char) * out_size);
+					}
+					// write char and maybe newline
+					out[out_pos++] = ch;
+					if ((++line_pos) >= width) {
+						out[out_pos++] = '\n';
+						line_pos = 0;
+						(*lines)++;
+					}
+				} else
+					word[word_len++] = ch;
+		}
+	}
+
+	free(word);
+}

ui.h

@@ -17,6 +17,8 @@
  * You should have received a copy of the GNU General Public License
  * along with hlogin. If not, see <https://www.gnu.org/licenses/>.
  */
+#define _XOPEN_SOURCE 600
+
 #ifndef __UI_H
 #define __UI_H
 
@@ -31,6 +33,7 @@ void paint_back();
 void paint_login();
 
 void ui_setup_dialog(char *prompt, bool password);
+void ui_setup_message(char *text);
 
 int ui_update();
 int ui_run();
@@ -42,4 +45,6 @@ void input_del_char();
 
 void draw_outline(WINDOW *win, int height, int width, int y, int x, bool inset);
 
+char *word_wrap(char *text, int width, int max_word, int *lines);
+
 #endif // __UI_H