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v1.9.13p3
lib/util/term.c
315 строк
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Todd C. Miller
Add debug tracing to tcsetattr_nobg().
02 фев 2023, 19:31
02 фев 2023, 19:31
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/* * SPDX-License-Identifier: ISC * * Copyright (c) 2011-2015, 2017-2020 Todd C. Miller <Todd.Miller@sudo.ws> * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ /* * This is an open source non-commercial project. Dear PVS-Studio, please check it. * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com */ #include <config.h> #include <sys/ioctl.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <errno.h> #include <signal.h> #include <termios.h> #include <unistd.h> #include "sudo_compat.h" #include "sudo_debug.h" #include "sudo_util.h" /* TCSASOFT is a BSD extension that ignores control flags and speed. */ #ifndef TCSASOFT # define TCSASOFT 0 #endif /* Non-standard termios input flags */ #ifndef IUCLC # define IUCLC 0 #endif #ifndef IMAXBEL # define IMAXBEL 0 #endif #ifndef IUTF8 # define IUTF8 0 #endif /* Non-standard termios output flags */ #ifndef OLCUC # define OLCUC 0 #endif #ifndef ONLCR # define ONLCR 0 #endif #ifndef OCRNL # define OCRNL 0 #endif #ifndef ONOCR # define ONOCR 0 #endif #ifndef ONLRET # define ONLRET 0 #endif /* Non-standard termios local flags */ #ifndef XCASE # define XCASE 0 #endif #ifndef IEXTEN # define IEXTEN 0 #endif #ifndef ECHOCTL # define ECHOCTL 0 #endif #ifndef ECHOKE # define ECHOKE 0 #endif #ifndef PENDIN # define PENDIN 0 #endif static struct termios oterm; static int changed; /* tgetpass() needs to know the erase and kill chars for cbreak mode. */ sudo_dso_public int sudo_term_eof; sudo_dso_public int sudo_term_erase; sudo_dso_public int sudo_term_kill; static volatile sig_atomic_t got_sigttou; /* * SIGTTOU signal handler for term_restore that just sets a flag. */ static void sigttou(int signo) { got_sigttou = 1; } /* * Like tcsetattr() but restarts on EINTR _except_ for SIGTTOU. * Returns 0 on success or -1 on failure, setting errno. * Sets got_sigttou on failure if interrupted by SIGTTOU. */ static int tcsetattr_nobg(int fd, int flags, struct termios *tp) { struct sigaction sa, osa; int rc; debug_decl(tcsetattr_nobg, SUDO_DEBUG_UTIL); /* * If we receive SIGTTOU from tcsetattr() it means we are * not in the foreground process group. * This should be less racy than using tcgetpgrp(). */ memset(&sa, 0, sizeof(sa)); sigemptyset(&sa.sa_mask); sa.sa_handler = sigttou; got_sigttou = 0; sigaction(SIGTTOU, &sa, &osa); do { rc = tcsetattr(fd, flags, tp); } while (rc != 0 && errno == EINTR && !got_sigttou); sigaction(SIGTTOU, &osa, NULL); debug_return_int(rc); } /* * Restore saved terminal settings if we are in the foreground process group. * Returns true on success or false on failure. */ bool sudo_term_restore_v1(int fd, bool flush) { debug_decl(sudo_term_restore, SUDO_DEBUG_UTIL); if (changed) { const int flags = flush ? (TCSASOFT|TCSAFLUSH) : (TCSASOFT|TCSADRAIN); if (tcsetattr_nobg(fd, flags, &oterm) != 0) debug_return_bool(false); changed = 0; } debug_return_bool(true); } /* * Disable terminal echo. * Returns true on success or false on failure. */ bool sudo_term_noecho_v1(int fd) { struct termios term; debug_decl(sudo_term_noecho, SUDO_DEBUG_UTIL); if (!changed && tcgetattr(fd, &oterm) != 0) debug_return_bool(false); (void) memcpy(&term, &oterm, sizeof(term)); CLR(term.c_lflag, ECHO|ECHONL); #ifdef VSTATUS term.c_cc[VSTATUS] = _POSIX_VDISABLE; #endif if (tcsetattr_nobg(fd, TCSASOFT|TCSADRAIN, &term) == 0) { changed = 1; debug_return_bool(true); } debug_return_bool(false); } /* * Set terminal to raw mode with optional terminal signals. * Returns true on success or false on failure. */ bool sudo_term_raw_v1(int fd, int isig) { struct termios term; debug_decl(sudo_term_raw, SUDO_DEBUG_UTIL); if (!changed && tcgetattr(fd, &oterm) != 0) debug_return_bool(false); (void) memcpy(&term, &oterm, sizeof(term)); /* Set terminal to raw mode but optionally enable terminal signals. */ cfmakeraw(&term); if (isig) SET(term.c_lflag, ISIG); if (tcsetattr_nobg(fd, TCSASOFT|TCSADRAIN, &term) == 0) { changed = 1; debug_return_bool(true); } debug_return_bool(false); } /* * Set terminal to cbreak mode. * Returns true on success or false on failure. */ bool sudo_term_cbreak_v1(int fd) { struct termios term; debug_decl(sudo_term_cbreak, SUDO_DEBUG_UTIL); if (!changed && tcgetattr(fd, &oterm) != 0) debug_return_bool(false); (void) memcpy(&term, &oterm, sizeof(term)); /* Set terminal to half-cooked mode */ term.c_cc[VMIN] = 1; term.c_cc[VTIME] = 0; /* cppcheck-suppress redundantAssignment */ CLR(term.c_lflag, ECHO | ECHONL | ICANON | IEXTEN); /* cppcheck-suppress redundantAssignment */ SET(term.c_lflag, ISIG); #ifdef VSTATUS term.c_cc[VSTATUS] = _POSIX_VDISABLE; #endif if (tcsetattr_nobg(fd, TCSASOFT|TCSADRAIN, &term) == 0) { sudo_term_eof = term.c_cc[VEOF]; sudo_term_erase = term.c_cc[VERASE]; sudo_term_kill = term.c_cc[VKILL]; changed = 1; debug_return_bool(true); } debug_return_bool(false); } /* Termios flags to copy between terminals. */ #define INPUT_FLAGS (IGNPAR|PARMRK|INPCK|ISTRIP|INLCR|IGNCR|ICRNL|IUCLC|IXON|IXANY|IXOFF|IMAXBEL|IUTF8) #define OUTPUT_FLAGS (OPOST|OLCUC|ONLCR|OCRNL|ONOCR|ONLRET) #define CONTROL_FLAGS (CS7|CS8|PARENB|PARODD) #define LOCAL_FLAGS (ISIG|ICANON|XCASE|ECHO|ECHOE|ECHOK|ECHONL|NOFLSH|TOSTOP|IEXTEN|ECHOCTL|ECHOKE|PENDIN) /* * Copy terminal settings from one descriptor to another. * We cannot simply copy the struct termios as src and dst may be * different terminal types (pseudo-tty vs. console or glass tty). * Returns true on success or false on failure. */ bool sudo_term_copy_v1(int src, int dst) { struct termios tt_src, tt_dst; struct winsize wsize; speed_t speed; int i; debug_decl(sudo_term_copy, SUDO_DEBUG_UTIL); if (tcgetattr(src, &tt_src) != 0 || tcgetattr(dst, &tt_dst) != 0) debug_return_bool(false); /* Clear select input, output, control and local flags. */ CLR(tt_dst.c_iflag, INPUT_FLAGS); CLR(tt_dst.c_oflag, OUTPUT_FLAGS); CLR(tt_dst.c_cflag, CONTROL_FLAGS); CLR(tt_dst.c_lflag, LOCAL_FLAGS); /* Copy select input, output, control and local flags. */ SET(tt_dst.c_iflag, (tt_src.c_iflag & INPUT_FLAGS)); SET(tt_dst.c_oflag, (tt_src.c_oflag & OUTPUT_FLAGS)); SET(tt_dst.c_cflag, (tt_src.c_cflag & CONTROL_FLAGS)); SET(tt_dst.c_lflag, (tt_src.c_lflag & LOCAL_FLAGS)); /* Copy special chars from src verbatim. */ for (i = 0; i < NCCS; i++) tt_dst.c_cc[i] = tt_src.c_cc[i]; /* Copy speed from src (zero output speed closes the connection). */ if ((speed = cfgetospeed(&tt_src)) == B0) speed = B38400; cfsetospeed(&tt_dst, speed); speed = cfgetispeed(&tt_src); cfsetispeed(&tt_dst, speed); if (tcsetattr_nobg(dst, TCSASOFT|TCSAFLUSH, &tt_dst) == -1) debug_return_bool(false); if (ioctl(src, TIOCGWINSZ, &wsize) == 0) (void)ioctl(dst, TIOCSWINSZ, &wsize); debug_return_bool(true); } /* * Returns true if fd refers to a tty in raw mode, else false. */ bool sudo_term_is_raw_v1(int fd) { struct termios term; debug_decl(sudo_term_is_raw, SUDO_DEBUG_UTIL); if (tcgetattr(fd, &term) != 0) debug_return_bool(false); if (term.c_cc[VMIN] != 1 || term.c_cc[VTIME] != 0) debug_return_bool(false); if (ISSET(term.c_oflag, OPOST)) debug_return_bool(false); if (ISSET(term.c_oflag, ECHO|ECHONL|ICANON)) debug_return_bool(false); debug_return_bool(true); }