added getpass implementation for non windows

modifies terminal attributes to emulate _getch

src/common/compat_getpass.c

@@ -7,6 +7,34 @@
 
 #ifdef _WIN32
 #include <conio.h>
+#else
+#include <stdio.h>
+#include <termios.h>
+#include <unistd.h>
+
+int _getch(void)
+{
+	struct termios old, mute;
+	int c;
+
+	tcgetattr(STDIN_FILENO, &old);
+	mute = old;
+	mute.c_lflag &= ~(ICANON|ECHO);
+
+	if (0 != tcsetattr(STDIN_FILENO, TCSANOW, &mute)) {
+		/* XXX an error happened */
+		/* We prefer to print the password, i.e. ignore the error,
+		 * rather than to deny the service, i.e. return something like '\0' */
+	}
+
+	c = getchar();
+
+	tcsetattr(STDIN_FILENO, TCSANOW, &old);
+
+	return c;
+}
+#endif
+
 char *getpass(const char *prompt)
 {
 	static char buf[128];
@@ -23,7 +51,4 @@ char *getpass(const char *prompt)
 	fputs("\n", stderr);
 	return buf;
 }
-#else
-#error Need getpass implementation
-#endif
 #endif	/* HAVE_GETPASS */