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Import libbsd readpassphrase (#1182)
Included from: https://gitlab.freedesktop.org/libbsd/libbsd At commit 04a24db27ad1572f766bad772cdd9c146e6d9cf0.
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GitHub
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2 changed files with 229 additions and 0 deletions
212
libc/stdio/readpassphrase.c
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212
libc/stdio/readpassphrase.c
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/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set noet ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ $OpenBSD: readpassphrase.c,v 1.26 2016/10/18 12:47:18 millert Exp $ │
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│ │
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│ Copyright (c) 2000-2002, 2007, 2010 │
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│ Todd C. Miller <Todd.Miller@courtesan.com> │
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│ │
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│ Permission to use, copy, modify, and distribute this software for any │
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│ purpose with or without fee is hereby granted, provided that the above │
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│ copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES │
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│ WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF │
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│ MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR │
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│ ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES │
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│ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN │
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│ ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF │
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│ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. │
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│ │
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│ Sponsored in part by the Defense Advanced Research Projects │
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│ Agency (DARPA) and Air Force Research Laboratory, Air Force │
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│ Materiel Command, USAF, under agreement number F39502-99-1-0512. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/stdio/readpassphrase.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/sigaction.h"
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#include "libc/calls/termios.h"
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#include "libc/errno.h"
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#include "libc/paths.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/fileno.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/sysv/consts/termios.h"
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#include "libc/unistd.h"
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__notice(readpassphrase_notice, "\
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libbsd readpassphrase (ISC)\n\
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Copyright (c) 2000-2002, 2007, 2010 Todd C. Miller <Todd.Miller@courtesan.com>");
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// clang-format off
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#ifndef TCSASOFT
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#define TCSASOFT 0
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#endif
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#ifndef _NSIG
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#if defined(NSIG)
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#define _NSIG NSIG
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#else
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/* The SIGRTMAX define might be set to a function such as sysconf(). */
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#define _NSIG (SIGRTMAX + 1)
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#endif
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#endif
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static volatile sig_atomic_t signo[_NSIG];
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static void handler(int);
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char *
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readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
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{
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ssize_t nr;
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int input, output, save_errno, i, need_restart;
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char ch, *p, *end;
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struct termios term, oterm;
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struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm;
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struct sigaction savetstp, savettin, savettou, savepipe;
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/* I suppose we could alloc on demand in this case (XXX). */
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if (bufsiz == 0) {
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errno = EINVAL;
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return(NULL);
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}
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restart:
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for (i = 0; i < _NSIG; i++)
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signo[i] = 0;
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nr = -1;
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save_errno = 0;
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need_restart = 0;
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/*
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* Read and write to /dev/tty if available. If not, read from
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* stdin and write to stderr unless a tty is required.
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*/
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if ((flags & RPP_STDIN) ||
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(input = output = open(_PATH_TTY, O_RDWR)) == -1) {
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if (flags & RPP_REQUIRE_TTY) {
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errno = ENOTTY;
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return(NULL);
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}
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input = STDIN_FILENO;
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output = STDERR_FILENO;
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}
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/*
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* Turn off echo if possible.
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* If we are using a tty but are not the foreground pgrp this will
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* generate SIGTTOU, so do it *before* installing the signal handlers.
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*/
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if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) {
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memcpy(&term, &oterm, sizeof(term));
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if (!(flags & RPP_ECHO_ON))
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term.c_lflag &= ~(ECHO | ECHONL);
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#ifdef VSTATUS
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if (term.c_cc[VSTATUS] != _POSIX_VDISABLE)
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term.c_cc[VSTATUS] = _POSIX_VDISABLE;
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#endif
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(void)tcsetattr(input, TCSAFLUSH|TCSASOFT, &term);
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} else {
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memset(&term, 0, sizeof(term));
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term.c_lflag |= ECHO;
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memset(&oterm, 0, sizeof(oterm));
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oterm.c_lflag |= ECHO;
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}
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/*
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* Catch signals that would otherwise cause the user to end
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* up with echo turned off in the shell. Don't worry about
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* things like SIGXCPU and SIGVTALRM for now.
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*/
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = 0; /* don't restart system calls */
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sa.sa_handler = handler;
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(void)sigaction(SIGALRM, &sa, &savealrm);
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(void)sigaction(SIGHUP, &sa, &savehup);
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(void)sigaction(SIGINT, &sa, &saveint);
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(void)sigaction(SIGPIPE, &sa, &savepipe);
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(void)sigaction(SIGQUIT, &sa, &savequit);
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(void)sigaction(SIGTERM, &sa, &saveterm);
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(void)sigaction(SIGTSTP, &sa, &savetstp);
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(void)sigaction(SIGTTIN, &sa, &savettin);
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(void)sigaction(SIGTTOU, &sa, &savettou);
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if (!(flags & RPP_STDIN))
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(void)write(output, prompt, strlen(prompt));
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end = buf + bufsiz - 1;
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p = buf;
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while ((nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r') {
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if (p < end) {
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if ((flags & RPP_SEVENBIT))
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ch &= 0x7f;
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if (isalpha((unsigned char)ch)) {
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if ((flags & RPP_FORCELOWER))
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ch = (char)tolower((unsigned char)ch);
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if ((flags & RPP_FORCEUPPER))
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ch = (char)toupper((unsigned char)ch);
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}
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*p++ = ch;
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}
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}
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*p = '\0';
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save_errno = errno;
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if (!(term.c_lflag & ECHO))
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(void)write(output, "\n", 1);
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/* Restore old terminal settings and signals. */
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if (memcmp(&term, &oterm, sizeof(term)) != 0) {
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const int sigttou = signo[SIGTTOU];
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/* Ignore SIGTTOU generated when we are not the fg pgrp. */
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while (tcsetattr(input, TCSAFLUSH|TCSASOFT, &oterm) == -1 &&
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errno == EINTR && !signo[SIGTTOU])
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continue;
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signo[SIGTTOU] = sigttou;
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}
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(void)sigaction(SIGALRM, &savealrm, NULL);
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(void)sigaction(SIGHUP, &savehup, NULL);
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(void)sigaction(SIGINT, &saveint, NULL);
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(void)sigaction(SIGQUIT, &savequit, NULL);
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(void)sigaction(SIGPIPE, &savepipe, NULL);
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(void)sigaction(SIGTERM, &saveterm, NULL);
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(void)sigaction(SIGTSTP, &savetstp, NULL);
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(void)sigaction(SIGTTIN, &savettin, NULL);
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(void)sigaction(SIGTTOU, &savettou, NULL);
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if (input != STDIN_FILENO)
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(void)close(input);
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/*
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* If we were interrupted by a signal, resend it to ourselves
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* now that we have restored the signal handlers.
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*/
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for (i = 0; i < _NSIG; i++) {
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if (signo[i]) {
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kill(getpid(), i);
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if (i == SIGTSTP || i == SIGTTIN || i == SIGTTOU) {
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need_restart = 1;
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}
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}
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}
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if (need_restart)
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goto restart;
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if (save_errno)
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errno = save_errno;
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return(nr == -1 ? NULL : buf);
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}
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#if 0
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char *
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getpass(const char *prompt)
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{
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static char buf[_PASSWORD_LEN + 1];
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return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF));
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}
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#endif
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static void handler(int s)
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{
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signo[s] = 1;
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}
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17
libc/stdio/readpassphrase.h
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17
libc/stdio/readpassphrase.h
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#ifndef COSMOPOLITAN_LIBC_STDIO_READPASSPHRASE_H_
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#define COSMOPOLITAN_LIBC_STDIO_READPASSPHRASE_H_
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#define RPP_ECHO_OFF 0x00
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#define RPP_ECHO_ON 0x01
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#define RPP_REQUIRE_TTY 0x02
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#define RPP_FORCELOWER 0x04
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#define RPP_FORCEUPPER 0x08
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#define RPP_SEVENBIT 0x10
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#define RPP_STDIN 0x20
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COSMOPOLITAN_C_START_
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char *readpassphrase(const char *, char *, size_t, int) libcesque;
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COSMOPOLITAN_C_END_
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#endif /* COSMOPOLITAN_LIBC_STDIO_READPASSPHRASE_H_ */
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