#include #include #include #include char* readpassphrase(const char* prompt, char* buf, size_t bufsz) { int n; int ttyfd = -1; struct termios term; for (int i = 0; i < 3; i++) { if (tcgetattr(i, &term) == 0) { ttyfd = i; break; } } if (ttyfd < 0) return NULL; term.c_lflag &= ~ECHO; tcsetattr(ttyfd, 0, &term); term.c_lflag |= ECHO; if (write(ttyfd, prompt, strlen(prompt)) < 0) { tcsetattr(ttyfd, 0, &term); return NULL; } n = read(ttyfd, buf, bufsz); if (n < 0) { tcsetattr(ttyfd, 0, &term); n = write(ttyfd, "\n", 1); return NULL; } buf[n-1] = '\0'; // NOTE: As we disabled echo, the enter sent by the user isn't displayed, so we resend it. n = write(ttyfd, "\n", 1); tcsetattr(ttyfd, 0, &term); return buf; }