/* vi: set sw=4 ts=4: */ /* * Ask for a password * I use a static buffer in this function. Plan accordingly. * * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> * * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. */ #include "libbb.h" /* do nothing signal handler */ static void askpass_timeout(int UNUSED_PARAM ignore) { } char* FAST_FUNC bb_ask_stdin(const char *prompt) { return bb_ask(STDIN_FILENO, 0, prompt); } char* FAST_FUNC bb_ask(const int fd, int timeout, const char *prompt) { /* Was static char[BIGNUM] */ enum { sizeof_passwd = 128 }; static char *passwd; char *ret; int i; struct sigaction sa, oldsa; struct termios tio, oldtio; tcgetattr(fd, &oldtio); tcflush(fd, TCIFLUSH); tio = oldtio; #ifndef IUCLC # define IUCLC 0 #endif tio.c_iflag &= ~(IUCLC|IXON|IXOFF|IXANY); tio.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL|TOSTOP); tcsetattr(fd, TCSANOW, &tio); memset(&sa, 0, sizeof(sa)); /* sa.sa_flags = 0; - no SA_RESTART! */ /* SIGINT and SIGALRM will interrupt reads below */ sa.sa_handler = askpass_timeout; sigaction(SIGINT, &sa, &oldsa); if (timeout) { sigaction_set(SIGALRM, &sa); alarm(timeout); } fputs(prompt, stdout); fflush_all(); if (!passwd) passwd = xmalloc(sizeof_passwd); ret = passwd; i = 0; while (1) { int r = read(fd, &ret[i], 1); if (r < 0) { /* read is interrupted by timeout or ^C */ ret = NULL; break; } if (r == 0 /* EOF */ || ret[i] == '\r' || ret[i] == '\n' /* EOL */ || ++i == sizeof_passwd-1 /* line limit */ ) { ret[i] = '\0'; break; } } if (timeout) { alarm(0); } sigaction_set(SIGINT, &oldsa); tcsetattr(fd, TCSANOW, &oldtio); bb_putchar('\n'); fflush_all(); return ret; }