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-rw-r--r--src/lib/askpass.c72
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);
+}