#56 Cntlm -H should use /dev/tty for password prompting

[Konrad Schwarz]

cntlm -H prompts for the password on stdout. This makes it unnecessarily difficult to use cntlm -H in a pipeline. E.g., the most natural way to update hashes in
the cntlm.conf file in vi is the command
:r !cntlm -H -uuser -ddomain
which reads the output of the cntlm -H into the file being edited.

As currently implemented, cntlm -H seems to hang, as it's Password: prompt to stdout
is directed into the pipeline and does not appear on the screen. After entering the
password, the resulting output interpolated into the file includes the Password: prompt;
this line must be deleted.

These problems are avoided by writing prompts to /dev/tty.

For example, the block starting at main.c:1200 could be changed to

if (interactivehash || magic_detect || (interactivepwd && !ntlmbasic)) {
            FILE *tty_file;

            if (!(tty_file = fopen ("/dev/tty", "rw"))
                    tty_file = stdin;
            fprintf(tty_file, "Password: ");
            fflush(tty_file);
            tcgetattr(0, &termold);
            termnew = termold;
            termnew.c_lflag &= ~(ISIG | ECHO);
            tcsetattr(0, TCSADRAIN, &termnew);
            tmp = fgets(cpassword, MINIBUF_SIZE, stdin);
            tcsetattr(0, TCSADRAIN, &termold);
            i = strlen(cpassword) - 1;
            if (cpassword[i] == '\n') {
                    cpassword[i] = 0;
                    if (cpassword[i - 1] == '\r')
                            cpassword[i - 1] = 0;
            }
            fprintf(tty_file, "\n");
            if (stdin != tty_file)
                    fclose (tty_file);
    }

(I may have reported this issue already, but without code.)