1 files changed, 72 insertions, 0 deletions
diff --git a/src/lib/askpass.c b/src/lib/askpass.c
new file mode 100644
index 0000000..bb9c128
--- /dev/null
+++ b/src/lib/askpass.c
@@ -0,0 +1,72 @@
+/* Copyright (c) 2006-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "buffer.h"
+#include "str.h"
+#include "askpass.h"
+
+#include <stdio.h>
+#include <termios.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+static void askpass_str(const char *prompt, buffer_t *pass)
+{
+        struct termios old_tio, tio;
+	bool tty, restore_tio = FALSE;
+	char ch;
+	int fd;
+
+	tty = isatty(STDIN_FILENO) != 0;
+	if (tty) {
+		fputs(prompt, stderr);
+		fflush(stderr);
+
+		fd = open("/dev/tty", O_RDONLY);
+		if (fd < 0)
+			i_fatal("open(/dev/tty) failed: %m");
+
+		/* turn off echo */
+		if (tcgetattr(fd, &old_tio) == 0) {
+			restore_tio = TRUE;
+			tio = old_tio;
+			tio.c_lflag &= ENUM_NEGATE(ECHO | ECHONL);
+			(void)tcsetattr(fd, TCSAFLUSH, &tio);
+		}
+	} else {
+		/* read it from stdin without showing a prompt */
+		fd = STDIN_FILENO;
+	}
+
+	/* read the password */
+	while (read(fd, &ch, 1) > 0) {
+		if (ch == '\n' || ch == '\r')
+			break;
+		buffer_append_c(pass, ch);
+	}
+
+	if (tty) {
+		if (restore_tio)
+			(void)tcsetattr(fd, TCSAFLUSH, &old_tio);
+
+		fputs("\n", stderr); fflush(stderr);
+		i_close_fd(&fd);
+	}
+}
+
+void askpass(const char *prompt, char *buf, size_t buf_size)
+{
+	buffer_t str;
+
+	buffer_create_from_data(&str, buf, buf_size);
+	askpass_str(prompt, &str);
+	buffer_append_c(&str, '\0');
+}
+
+const char *t_askpass(const char *prompt)
+{
+	string_t *str = t_str_new(32);
+
+	askpass_str(prompt, str);
+	return str_c(str);
+}