+/* $OpenBSD: readpassphrase.c,v 1.12 2001/12/15 05:41:00 millert Exp $ */
+
/*
* Copyright (c) 2000 Todd C. Miller <Todd.Miller@courtesan.com>
* All rights reserved.
*/
#if defined(LIBC_SCCS) && !defined(lint)
-static char rcsid[] = "$OpenBSD: readpassphrase.c,v 1.5 2001/06/27 13:23:30 djm Exp $";
+static const char rcsid[] = "$OpenBSD: readpassphrase.c,v 1.12 2001/12/15 05:41:00 millert Exp $";
#endif /* LIBC_SCCS and not lint */
#include "includes.h"
# define _POSIX_VDISABLE VDISABLE
#endif
+static volatile sig_atomic_t signo;
+
+static void handler(int);
+
char *
-readpassphrase(prompt, buf, bufsiz, flags)
- const char *prompt;
- char *buf;
- size_t bufsiz;
- int flags;
+readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
{
- struct termios term;
+ ssize_t nr;
+ int input, output, save_errno;
char ch, *p, *end;
-#ifdef _POSIX_VDISABLE
- u_char status;
-#endif
- int echo, input, output;
- sigset_t oset, nset;
+ struct termios term, oterm;
+ struct sigaction sa, saveint, savehup, savequit, saveterm;
+ struct sigaction savetstp, savettin, savettou;
/* I suppose we could alloc on demand in this case (XXX). */
if (bufsiz == 0) {
return(NULL);
}
+restart:
/*
* Read and write to /dev/tty if available. If not, read from
* stdin and write to stderr unless a tty is required.
}
/*
- * We block SIGINT and SIGTSTP so the terminal is not left
- * in an inconsistent state (ie: no echo). It would probably
- * be better to simply catch these though.
+ * Catch signals that would otherwise cause the user to end
+ * up with echo turned off in the shell. Don't worry about
+ * things like SIGALRM and SIGPIPE for now.
*/
- sigemptyset(&nset);
- sigaddset(&nset, SIGINT);
- sigaddset(&nset, SIGTSTP);
- (void)sigprocmask(SIG_BLOCK, &nset, &oset);
+ sigemptyset(&sa.sa_mask);
+ sa.sa_flags = 0; /* don't restart system calls */
+ sa.sa_handler = handler;
+ (void)sigaction(SIGINT, &sa, &saveint);
+ (void)sigaction(SIGHUP, &sa, &savehup);
+ (void)sigaction(SIGQUIT, &sa, &savequit);
+ (void)sigaction(SIGTERM, &sa, &saveterm);
+ (void)sigaction(SIGTSTP, &sa, &savetstp);
+ (void)sigaction(SIGTTIN, &sa, &savettin);
+ (void)sigaction(SIGTTOU, &sa, &savettou);
/* Turn off echo if possible. */
- echo = 0;
-#ifdef _POSIX_VDISABLE
- status = _POSIX_VDISABLE;
-#endif
- if (tcgetattr(input, &term) == 0) {
- if (!(flags & RPP_ECHO_ON) && (term.c_lflag & ECHO)) {
- echo = 1;
- term.c_lflag &= ~ECHO;
- }
+ if (tcgetattr(input, &oterm) == 0) {
+ memcpy(&term, &oterm, sizeof(term));
+ if (!(flags & RPP_ECHO_ON))
+ term.c_lflag &= ~(ECHO | ECHONL);
#ifdef VSTATUS
- if (term.c_cc[VSTATUS] != _POSIX_VDISABLE) {
- status = term.c_cc[VSTATUS];
+ if (term.c_cc[VSTATUS] != _POSIX_VDISABLE)
term.c_cc[VSTATUS] = _POSIX_VDISABLE;
- }
#endif
(void)tcsetattr(input, _T_FLUSH, &term);
- }
- if (!(flags & RPP_ECHO_ON)) {
- if (tcgetattr(input, &term) == 0 && (term.c_lflag & ECHO)) {
- echo = 1;
- term.c_lflag &= ~ECHO;
- (void)tcsetattr(input, _T_FLUSH, &term);
- }
+ } else {
+ memset(&term, 0, sizeof(term));
+ memset(&oterm, 0, sizeof(oterm));
}
(void)write(output, prompt, strlen(prompt));
end = buf + bufsiz - 1;
- for (p = buf; read(input, &ch, 1) == 1 && ch != '\n' && ch != '\r';) {
+ for (p = buf; (nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r';) {
if (p < end) {
if ((flags & RPP_SEVENBIT))
ch &= 0x7f;
}
}
*p = '\0';
-#ifdef _POSIX_VDISABLE
- if (echo || status != _POSIX_VDISABLE) {
-#else
- if (echo) {
-#endif
- if (echo) {
- (void)write(output, "\n", 1);
- term.c_lflag |= ECHO;
- }
-#ifdef VSTATUS
- if (status != _POSIX_VDISABLE)
- term.c_cc[VSTATUS] = status;
-#endif
- (void)tcsetattr(input, _T_FLUSH, &term);
- }
- (void)sigprocmask(SIG_SETMASK, &oset, NULL);
+ save_errno = errno;
+ if (!(term.c_lflag & ECHO))
+ (void)write(output, "\n", 1);
+
+ /* Restore old terminal settings and signals. */
+ if (memcmp(&term, &oterm, sizeof(term)) != 0)
+ (void)tcsetattr(input, _T_FLUSH, &oterm);
+ (void)sigaction(SIGINT, &saveint, NULL);
+ (void)sigaction(SIGHUP, &savehup, NULL);
+ (void)sigaction(SIGQUIT, &savequit, NULL);
+ (void)sigaction(SIGTERM, &saveterm, NULL);
+ (void)sigaction(SIGTSTP, &savetstp, NULL);
+ (void)sigaction(SIGTTIN, &savettin, NULL);
+ (void)sigaction(SIGTTOU, &savettou, NULL);
if (input != STDIN_FILENO)
(void)close(input);
- return(buf);
+
+ /*
+ * If we were interrupted by a signal, resend it to ourselves
+ * now that we have restored the signal handlers.
+ */
+ if (signo) {
+ kill(getpid(), signo);
+ switch (signo) {
+ case SIGTSTP:
+ case SIGTTIN:
+ case SIGTTOU:
+ signo = 0;
+ goto restart;
+ }
+ }
+
+ errno = save_errno;
+ return(nr == -1 ? NULL : buf);
}
#endif /* HAVE_READPASSPHRASE */
-
+
#if 0
char *
-getpass(prompt)
- const char *prompt;
+getpass(const char *prompt)
{
static char buf[_PASSWORD_LEN + 1];
return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF));
}
#endif
+
+static void handler(int s)
+{
+
+ signo = s;
+}
andersk / gssapi-openssh.git / blobdiff