Top level directory reorg
Move src/po -> po Combine common and compat -> lib/util Move zlib -> lib/zlib
This commit is contained in:
Todd C. Miller
253
lib/util/term.c
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253
lib/util/term.c
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/*
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* Copyright (c) 2011-2014 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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#include <config.h>
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#include <sys/types.h>
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#include <stdio.h>
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#ifdef STDC_HEADERS
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# include <stdlib.h>
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# include <stddef.h>
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#else
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# ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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# endif
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#endif /* STDC_HEADERS */
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#ifdef HAVE_STRING_H
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# if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
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# include <memory.h>
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# endif
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# include <string.h>
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif /* HAVE_STRINGS_H */
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#include <errno.h>
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#include <signal.h>
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#include <termios.h>
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#include <unistd.h>
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#include "missing.h"
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#include "sudo_debug.h"
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#include "sudo_util.h"
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#ifndef TCSASOFT
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# define TCSASOFT 0
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#endif
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#ifndef ECHONL
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# define ECHONL 0
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#endif
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#ifndef IEXTEN
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# define IEXTEN 0
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#endif
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#ifndef IUCLC
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# define IUCLC 0
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#endif
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#ifndef _POSIX_VDISABLE
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# ifdef VDISABLE
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# define _POSIX_VDISABLE VDISABLE
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# else
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# define _POSIX_VDISABLE 0
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# endif
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#endif
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static struct termios term, oterm;
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static int changed;
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/* tgetpass() needs to know the erase and kill chars for cbreak mode. */
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int term_erase;
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int term_kill;
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static volatile sig_atomic_t got_sigttou;
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/*
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* SIGTTOU signal handler for term_restore that just sets a flag.
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*/
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static void sigttou(int signo)
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{
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got_sigttou = 1;
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}
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/*
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* Like tcsetattr() but restarts on EINTR _except_ for SIGTTOU.
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* Returns 0 on success or -1 on failure, setting errno.
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* Sets got_sigttou on failure if interrupted by SIGTTOU.
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*/
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static int
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tcsetattr_nobg(int fd, int flags, struct termios *tp)
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{
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sigaction_t sa, osa;
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int rc;
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/*
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* If we receive SIGTTOU from tcsetattr() it means we are
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* not in the foreground process group.
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* This should be less racy than using tcgetpgrp().
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*/
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memset(&sa, 0, sizeof(sa));
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sigemptyset(&sa.sa_mask);
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sa.sa_handler = sigttou;
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got_sigttou = 0;
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sigaction(SIGTTOU, &sa, &osa);
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do {
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rc = tcsetattr(fd, flags, tp);
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} while (rc != 0 && errno == EINTR && !got_sigttou);
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sigaction(SIGTTOU, &osa, NULL);
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return rc;
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}
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/*
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* Restore saved terminal settings if we are in the foreground process group.
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* Returns true on success or false on failure.
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*/
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bool
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term_restore(int fd, bool flush)
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{
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debug_decl(term_restore, SUDO_DEBUG_UTIL)
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if (changed) {
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const int flags = flush ? (TCSASOFT|TCSAFLUSH) : (TCSASOFT|TCSADRAIN);
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if (tcsetattr_nobg(fd, flags, &oterm) != 0)
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debug_return_bool(false);
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changed = 0;
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}
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debug_return_bool(true);
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}
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/*
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* Disable terminal echo.
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* Returns true on success or false on failure.
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*/
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bool
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term_noecho(int fd)
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{
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debug_decl(term_noecho, SUDO_DEBUG_UTIL)
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again:
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if (!changed && tcgetattr(fd, &oterm) != 0)
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debug_return_bool(false);
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(void) memcpy(&term, &oterm, sizeof(term));
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CLR(term.c_lflag, ECHO|ECHONL);
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#ifdef VSTATUS
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term.c_cc[VSTATUS] = _POSIX_VDISABLE;
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#endif
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if (tcsetattr_nobg(fd, TCSADRAIN|TCSASOFT, &term) == 0) {
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changed = 1;
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debug_return_bool(true);
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}
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if (got_sigttou) {
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/* We were in the background, so oterm is probably bogus. */
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kill(getpid(), SIGTTOU);
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goto again;
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}
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debug_return_bool(false);
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}
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/*
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* Set terminal to raw mode.
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* Returns true on success or false on failure.
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*/
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bool
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term_raw(int fd, int isig)
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{
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struct termios term;
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debug_decl(term_raw, SUDO_DEBUG_UTIL)
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again:
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if (!changed && tcgetattr(fd, &oterm) != 0)
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return 0;
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(void) memcpy(&term, &oterm, sizeof(term));
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/* Set terminal to raw mode */
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term.c_cc[VMIN] = 1;
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term.c_cc[VTIME] = 0;
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CLR(term.c_iflag, ICRNL | IGNCR | INLCR | IUCLC | IXON);
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CLR(term.c_oflag, OPOST);
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CLR(term.c_lflag, ECHO | ICANON | ISIG | IEXTEN);
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if (isig)
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SET(term.c_lflag, ISIG);
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if (tcsetattr_nobg(fd, TCSADRAIN|TCSASOFT, &term) == 0) {
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changed = 1;
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debug_return_bool(true);
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}
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if (got_sigttou) {
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/* We were in the background, so oterm is probably bogus. */
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kill(getpid(), SIGTTOU);
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goto again;
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}
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debug_return_bool(false);
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}
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/*
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* Set terminal to cbreak mode.
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* Returns true on success or false on failure.
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*/
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bool
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term_cbreak(int fd)
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{
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debug_decl(term_cbreak, SUDO_DEBUG_UTIL)
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again:
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if (!changed && tcgetattr(fd, &oterm) != 0)
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return 0;
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(void) memcpy(&term, &oterm, sizeof(term));
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/* Set terminal to half-cooked mode */
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term.c_cc[VMIN] = 1;
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term.c_cc[VTIME] = 0;
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/* cppcheck-suppress redundantAssignment */
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CLR(term.c_lflag, ECHO | ECHONL | ICANON | IEXTEN);
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/* cppcheck-suppress redundantAssignment */
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SET(term.c_lflag, ISIG);
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#ifdef VSTATUS
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term.c_cc[VSTATUS] = _POSIX_VDISABLE;
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#endif
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if (tcsetattr_nobg(fd, TCSADRAIN|TCSASOFT, &term) == 0) {
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term_erase = term.c_cc[VERASE];
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term_kill = term.c_cc[VKILL];
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changed = 1;
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debug_return_bool(true);
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}
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if (got_sigttou) {
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/* We were in the background, so oterm is probably bogus. */
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kill(getpid(), SIGTTOU);
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goto again;
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}
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debug_return_bool(false);
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}
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/*
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* Copy terminal settings from one descriptor to another.
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* Returns true on success or false on failure.
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*/
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bool
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term_copy(int src, int dst)
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{
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struct termios tt;
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debug_decl(term_copy, SUDO_DEBUG_UTIL)
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again:
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if (tcgetattr(src, &tt) != 0)
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debug_return_bool(false);
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if (tcsetattr_nobg(dst, TCSANOW|TCSASOFT, &tt) == 0)
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debug_return_bool(true);
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if (got_sigttou) {
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/* We were in the background, so oterm is probably bogus. */
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kill(getpid(), SIGTTOU);
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goto again;
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}
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debug_return_bool(false);
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}
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