2 * Copyright (c) 1996, 1998-2005 Todd C. Miller <Todd.Miller@courtesan.com>
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.
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.
16 * Sponsored in part by the Defense Advanced Research Projects
17 * Agency (DARPA) and Air Force Research Laboratory, Air Force
18 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
27 #include <sys/types.h>
28 #include <sys/param.h>
29 #ifdef HAVE_SYS_BSDTYPES_H
30 # include <sys/bsdtypes.h>
31 #endif /* HAVE_SYS_BSDTYPES_H */
41 #endif /* STDC_HEADERS */
43 # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
48 # ifdef HAVE_STRINGS_H
51 #endif /* HAVE_STRING_H */
54 #endif /* HAVE_UNISTD_H */
66 # include <sys/ioctl.h>
67 # endif /* HAVE_TERMIO_H */
68 #endif /* HAVE_TERMIOS_H */
73 __unused static const char rcsid[] = "$Sudo: tgetpass.c,v 1.111.2.5 2007/10/17 15:39:43 millert Exp $";
83 #ifndef _POSIX_VDISABLE
85 # define _POSIX_VDISABLE VDISABLE
87 # define _POSIX_VDISABLE 0
92 * QNX 6 (at least) has issues with TCSAFLUSH.
96 #define TCSAFLUSH TCSADRAIN
100 * Compat macros for non-termios systems.
102 #ifndef HAVE_TERMIOS_H
103 # ifdef HAVE_TERMIO_H
105 # define termios termio
106 # define tcgetattr(f, t) ioctl(f, TCGETA, t)
107 # define tcsetattr(f, a, t) ioctl(f, a, t)
109 # define TCSAFLUSH TCSETAF
111 # define TCSANOW TCSETA
114 # define termios sgttyb
115 # define c_lflag sg_flags
116 # define tcgetattr(f, t) ioctl(f, TIOCGETP, t)
117 # define tcsetattr(f, a, t) ioctl(f, a, t)
119 # define TCSAFLUSH TIOCSETP
121 # define TCSANOW TIOCSETN
122 # endif /* HAVE_TERMIO_H */
123 #endif /* HAVE_TERMIOS_H */
125 static volatile sig_atomic_t signo;
127 static void handler __P((int));
128 static char *getln __P((int, char *, size_t));
131 * Like getpass(3) but with timeout and echo flags.
134 tgetpass(prompt, timeout, flags)
139 sigaction_t sa, savealrm, saveint, savehup, savequit, saveterm;
140 sigaction_t savetstp, savettin, savettou;
141 struct termios term, oterm;
143 static char buf[SUDO_PASS_MAX + 1];
144 int input, output, save_errno;
146 (void) fflush(stdout);
151 /* Open /dev/tty for reading/writing if possible else use stdin/stderr. */
152 if (ISSET(flags, TGP_STDIN) ||
153 (input = output = open(_PATH_TTY, O_RDWR|O_NOCTTY)) == -1) {
154 input = STDIN_FILENO;
155 output = STDERR_FILENO;
159 * Catch signals that would otherwise cause the user to end
160 * up with echo turned off in the shell.
162 sigemptyset(&sa.sa_mask);
163 sa.sa_flags = SA_INTERRUPT; /* don't restart system calls */
164 sa.sa_handler = handler;
165 (void) sigaction(SIGALRM, &sa, &savealrm);
166 (void) sigaction(SIGINT, &sa, &saveint);
167 (void) sigaction(SIGHUP, &sa, &savehup);
168 (void) sigaction(SIGQUIT, &sa, &savequit);
169 (void) sigaction(SIGTERM, &sa, &saveterm);
170 (void) sigaction(SIGTSTP, &sa, &savetstp);
171 (void) sigaction(SIGTTIN, &sa, &savettin);
172 (void) sigaction(SIGTTOU, &sa, &savettou);
174 /* Turn echo off/on as specified by flags. */
175 if (tcgetattr(input, &oterm) == 0) {
176 (void) memcpy(&term, &oterm, sizeof(term));
177 if (!ISSET(flags, TGP_ECHO))
178 CLR(term.c_lflag, ECHO|ECHONL);
180 term.c_cc[VSTATUS] = _POSIX_VDISABLE;
182 (void) tcsetattr(input, TCSAFLUSH|TCSASOFT, &term);
184 memset(&term, 0, sizeof(term));
185 memset(&oterm, 0, sizeof(oterm));
188 /* No output if we are already backgrounded. */
189 if (signo != SIGTTOU && signo != SIGTTIN) {
191 (void) write(output, prompt, strlen(prompt));
195 pass = getln(input, buf, sizeof(buf));
199 if (!ISSET(term.c_lflag, ECHO))
200 (void) write(output, "\n", 1);
203 /* Restore old tty settings and signals. */
204 if (memcmp(&term, &oterm, sizeof(term)) != 0) {
205 while (tcsetattr(input, TCSANOW|TCSASOFT, &oterm) == -1 &&
209 (void) sigaction(SIGALRM, &savealrm, NULL);
210 (void) sigaction(SIGINT, &saveint, NULL);
211 (void) sigaction(SIGHUP, &savehup, NULL);
212 (void) sigaction(SIGQUIT, &savequit, NULL);
213 (void) sigaction(SIGTERM, &saveterm, NULL);
214 (void) sigaction(SIGTSTP, &savetstp, NULL);
215 (void) sigaction(SIGTTIN, &savettin, NULL);
216 (void) sigaction(SIGTTOU, &savettou, NULL);
217 if (input != STDIN_FILENO)
221 * If we were interrupted by a signal, resend it to ourselves
222 * now that we have restored the signal handlers.
225 kill(getpid(), signo);
240 getln(fd, buf, bufsiz)
250 return(NULL); /* sanity */
255 while (--bufsiz && (nr = read(fd, &c, 1)) == 1 && c != '\n' && c != '\r')
258 return(nr == -1 ? NULL : buf);