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Annotation of embedaddon/sudo/common/term.c, revision 1.1.1.2

1.1       misho       1: /*
                      2:  * Copyright (c) 2011 Todd C. Miller <Todd.Miller@courtesan.com>
                      3:  *
                      4:  * Permission to use, copy, modify, and distribute this software for any
                      5:  * purpose with or without fee is hereby granted, provided that the above
                      6:  * copyright notice and this permission notice appear in all copies.
                      7:  *
                      8:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                      9:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     10:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     11:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     12:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     13:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     14:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     15:  */
                     16: 
                     17: #include <config.h>
                     18: 
                     19: #include <sys/types.h>
                     20: #include <sys/param.h>
                     21: #include <stdio.h>
                     22: #ifdef STDC_HEADERS
                     23: # include <stdlib.h>
                     24: # include <stddef.h>
                     25: #else
                     26: # ifdef HAVE_STDLIB_H
                     27: #  include <stdlib.h>
                     28: # endif
                     29: #endif /* STDC_HEADERS */
                     30: #ifdef HAVE_STRING_H
                     31: # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
                     32: #  include <memory.h>
                     33: # endif
                     34: # include <string.h>
                     35: #endif /* HAVE_STRING_H */
                     36: #ifdef HAVE_STRINGS_H
                     37: # include <strings.h>
                     38: #endif /* HAVE_STRINGS_H */
                     39: #include <termios.h>
                     40: 
                     41: #include "missing.h"
1.1.1.2 ! misho      42: #include "sudo_debug.h"
1.1       misho      43: 
                     44: #ifndef TCSASOFT
                     45: # define TCSASOFT      0
                     46: #endif
                     47: #ifndef ECHONL
                     48: # define ECHONL                0
                     49: #endif
                     50: #ifndef IEXTEN
                     51: # define IEXTEN                0
                     52: #endif
                     53: #ifndef IUCLC
                     54: # define IUCLC         0
                     55: #endif
                     56: 
                     57: #ifndef _POSIX_VDISABLE
                     58: # ifdef VDISABLE
                     59: #  define _POSIX_VDISABLE      VDISABLE
                     60: # else
                     61: #  define _POSIX_VDISABLE      0
                     62: # endif
                     63: #endif
                     64: 
                     65: static struct termios term, oterm;
                     66: static int changed;
                     67: int term_erase;
                     68: int term_kill;
                     69: 
                     70: int
                     71: term_restore(int fd, int flush)
                     72: {
1.1.1.2 ! misho      73:     debug_decl(term_restore, SUDO_DEBUG_UTIL)
        !            74: 
1.1       misho      75:     if (changed) {
                     76:        int flags = TCSASOFT;
                     77:        flags |= flush ? TCSAFLUSH : TCSADRAIN;
                     78:        if (tcsetattr(fd, flags, &oterm) != 0)
1.1.1.2 ! misho      79:            debug_return_int(0);
1.1       misho      80:        changed = 0;
                     81:     }
1.1.1.2 ! misho      82:     debug_return_int(1);
1.1       misho      83: }
                     84: 
                     85: int
                     86: term_noecho(int fd)
                     87: {
1.1.1.2 ! misho      88:     debug_decl(term_noecho, SUDO_DEBUG_UTIL)
        !            89: 
1.1       misho      90:     if (!changed && tcgetattr(fd, &oterm) != 0)
1.1.1.2 ! misho      91:        debug_return_int(0);
1.1       misho      92:     (void) memcpy(&term, &oterm, sizeof(term));
                     93:     CLR(term.c_lflag, ECHO|ECHONL);
                     94: #ifdef VSTATUS
                     95:     term.c_cc[VSTATUS] = _POSIX_VDISABLE;
                     96: #endif
                     97:     if (tcsetattr(fd, TCSADRAIN|TCSASOFT, &term) == 0) {
                     98:        changed = 1;
1.1.1.2 ! misho      99:        debug_return_int(1);
1.1       misho     100:     }
1.1.1.2 ! misho     101:     debug_return_int(0);
1.1       misho     102: }
                    103: 
                    104: int
                    105: term_raw(int fd, int isig)
                    106: {
                    107:     struct termios term;
1.1.1.2 ! misho     108:     debug_decl(term_raw, SUDO_DEBUG_UTIL)
1.1       misho     109: 
                    110:     if (!changed && tcgetattr(fd, &oterm) != 0)
                    111:        return 0;
                    112:     (void) memcpy(&term, &oterm, sizeof(term));
                    113:     /* Set terminal to raw mode */
                    114:     term.c_cc[VMIN] = 1;
                    115:     term.c_cc[VTIME] = 0;
                    116:     CLR(term.c_iflag, ICRNL | IGNCR | INLCR | IUCLC | IXON);
                    117:     CLR(term.c_oflag, OPOST);
                    118:     CLR(term.c_lflag, ECHO | ICANON | ISIG | IEXTEN);
                    119:     if (isig)
                    120:        SET(term.c_lflag, ISIG);
                    121:     if (tcsetattr(fd, TCSADRAIN|TCSASOFT, &term) == 0) {
                    122:        changed = 1;
1.1.1.2 ! misho     123:        debug_return_int(1);
1.1       misho     124:     }
1.1.1.2 ! misho     125:     debug_return_int(0);
1.1       misho     126: }
                    127: 
                    128: int
                    129: term_cbreak(int fd)
                    130: {
1.1.1.2 ! misho     131:     debug_decl(term_cbreak, SUDO_DEBUG_UTIL)
        !           132: 
1.1       misho     133:     if (!changed && tcgetattr(fd, &oterm) != 0)
                    134:        return 0;
                    135:     (void) memcpy(&term, &oterm, sizeof(term));
                    136:     /* Set terminal to half-cooked mode */
                    137:     term.c_cc[VMIN] = 1;
                    138:     term.c_cc[VTIME] = 0;
                    139:     CLR(term.c_lflag, ECHO | ECHONL | ICANON | IEXTEN);
                    140:     SET(term.c_lflag, ISIG);
                    141: #ifdef VSTATUS
                    142:     term.c_cc[VSTATUS] = _POSIX_VDISABLE;
                    143: #endif
                    144:     if (tcsetattr(fd, TCSADRAIN|TCSASOFT, &term) == 0) {
                    145:        term_erase = term.c_cc[VERASE];
                    146:        term_kill = term.c_cc[VKILL];
                    147:        changed = 1;
1.1.1.2 ! misho     148:        debug_return_int(1);
1.1       misho     149:     }
1.1.1.2 ! misho     150:     debug_return_int(0);
1.1       misho     151: }
                    152: 
                    153: int
                    154: term_copy(int src, int dst)
                    155: {
                    156:     struct termios tt;
1.1.1.2 ! misho     157:     debug_decl(term_copy, SUDO_DEBUG_UTIL)
1.1       misho     158: 
                    159:     if (tcgetattr(src, &tt) != 0)
1.1.1.2 ! misho     160:        debug_return_int(0);
1.1       misho     161:     if (tcsetattr(dst, TCSANOW|TCSASOFT, &tt) != 0)
1.1.1.2 ! misho     162:        debug_return_int(0);
        !           163:     debug_return_int(1);
1.1       misho     164: }