ClickHouse

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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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/* OPENBSD ORIGINAL: lib/libc/gen/readpassphrase.c */
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#ifndef _PATH_TTY
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#define _PATH_TTY "/dev/tty"
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#endif
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#pragma clang diagnostic ignored "-Wreserved-identifier"
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#include <termios.h>
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#include <signal.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include "readpassphrase.h"
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#ifndef TCSASOFT
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/* If we don't have TCSASOFT define it so that ORing it it below is a no-op. */
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# define TCSASOFT 0
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#endif
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/* SunOS 4.x which lacks _POSIX_VDISABLE, but has VDISABLE */
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#if !defined(_POSIX_VDISABLE) && defined(VDISABLE)
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#  define _POSIX_VDISABLE       VDISABLE
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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 &= ~((unsigned int) (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 = (int)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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            switch (i) {
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            case SIGTSTP:
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            case SIGTTIN:
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            case 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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//DEF_WEAK(readpassphrase);
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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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