Problem - Kevin Tafuro

et[ctr] = ch;
if (ctr && !(ctr & BUF_STEP)) {
if (!(tmp = (unsigned char *)realloc(ret, ctr + BUF_STEP + 1))) {
free(ret);
return 0;
}
ret = tmp;
}
ctr++;
}
}
unsigned char *spc_read_password(unsigned char *prompt, FILE *term) {
int close = 0, termfd;
sigset_t saved_signals, set_signals;
unsigned char *retval;
struct termios saved_term, set_term;
if (!term) {
if (!(term = fopen(_PATH_TTY, "r+"))) return 0;
close = 1;
}
termfd = fileno(term);
fprintf(term, "%s", prompt);
fflush(term);
/* Defer interruption when echo is turned off */
sigemptyset(&set_signals);
sigaddset(&set_signals, SIGINT);
sigaddset(&set_signals, SIGTSTP);
sigprocmask(SIG_BLOCK, &set_signals, &saved_signals);
/*Save the current state and set the terminal to not echo */
tcgetattr(termfd, &saved_term);
set_term = saved_term;
set_term.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL);
tcsetattr(termfd, TCSAFLUSH, &set_term);
retval = read_password(termfd);
fprintf(term, "\n");
tcsetattr(termfd, TCSAFLUSH, &saved_term);
sigprocmask(SIG_SETMASK, &saved_signals, 0);
if (close) fclose(term);
return retval;
}
Prompting for a password on Windows
On Windows, prompting for a password is as simple as setting the ES_PASSWORD style
flag for an EDIT control. When this flag is set, Windows will not display the charac-
396 | Chapter 8: Authentication and Key Exchange
This is the Title of the Book, eMatter Edition
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