From 88e7c1199c1b9260bf7bf017363093e1b04e0e10 Mon Sep 17 00:00:00 2001
From: sin <sin@2f30.org>
Date: Mon, 22 Sep 2014 11:36:12 +0100
Subject: Use portable readpassphrase() from OpenSSH

---
 readpassphrase.c | 104 ++++++++++++++++++++++++++++++-------------------------
 1 file changed, 57 insertions(+), 47 deletions(-)

(limited to 'readpassphrase.c')

diff --git a/readpassphrase.c b/readpassphrase.c
index 552e390..4b0e7eb 100644
--- a/readpassphrase.c
+++ b/readpassphrase.c
@@ -1,8 +1,7 @@
-/*	$OpenBSD: readpassphrase.c,v 1.24 2013/11/24 23:51:29 deraadt Exp $	*/
+/*	$OpenBSD: readpassphrase.c,v 1.22 2010/01/13 10:20:54 dtucker Exp $	*/
 
 /*
- * Copyright (c) 2000-2002, 2007, 2010
- *	Todd C. Miller <Todd.Miller@courtesan.com>
+ * Copyright (c) 2000-2002, 2007 Todd C. Miller <Todd.Miller@courtesan.com>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -21,18 +20,28 @@
  * Materiel Command, USAF, under agreement number F39502-99-1-0512.
  */
 
+#include <termios.h>
+#include <signal.h>
 #include <ctype.h>
-#include <errno.h>
 #include <fcntl.h>
-#include <paths.h>
-#include <pwd.h>
-#include <signal.h>
+#include <errno.h>
 #include <string.h>
-#include <termios.h>
 #include <unistd.h>
+#include <paths.h>
 
 #include "readpassphrase.h"
 
+#ifdef TCSASOFT
+# define _T_FLUSH	(TCSAFLUSH|TCSASOFT)
+#else
+# define _T_FLUSH	(TCSAFLUSH)
+#endif
+
+/* SunOS 4.x which lacks _POSIX_VDISABLE, but has VDISABLE */
+#if !defined(_POSIX_VDISABLE) && defined(VDISABLE)
+#  define _POSIX_VDISABLE       VDISABLE
+#endif
+
 static volatile sig_atomic_t signo[_NSIG];
 
 static void handler(int);
@@ -73,25 +82,6 @@ restart:
 		output = STDERR_FILENO;
 	}
 
-	/*
-	 * Turn off echo if possible.
-	 * If we are using a tty but are not the foreground pgrp this will
-	 * generate SIGTTOU, so do it *before* installing the signal handlers.
-	 */
-	if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) {
-		memcpy(&term, &oterm, sizeof(term));
-		if (!(flags & RPP_ECHO_ON))
-			term.c_lflag &= ~(ECHO | ECHONL);
-		if (term.c_cc[VSTATUS] != _POSIX_VDISABLE)
-			term.c_cc[VSTATUS] = _POSIX_VDISABLE;
-		(void)tcsetattr(input, TCSAFLUSH|TCSASOFT, &term);
-	} else {
-		memset(&term, 0, sizeof(term));
-		term.c_lflag |= ECHO;
-		memset(&oterm, 0, sizeof(oterm));
-		oterm.c_lflag |= ECHO;
-	}
-
 	/*
 	 * Catch signals that would otherwise cause the user to end
 	 * up with echo turned off in the shell.  Don't worry about
@@ -110,32 +100,52 @@ restart:
 	(void)sigaction(SIGTTIN, &sa, &savettin);
 	(void)sigaction(SIGTTOU, &sa, &savettou);
 
-	if (!(flags & RPP_STDIN))
-		(void)write(output, prompt, strlen(prompt));
-	end = buf + bufsiz - 1;
-	p = buf;
-	while ((nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r') {
-		if (p < end) {
-			if ((flags & RPP_SEVENBIT))
-				ch &= 0x7f;
-			if (isalpha((unsigned char)ch)) {
-				if ((flags & RPP_FORCELOWER))
-					ch = (char)tolower((unsigned char)ch);
-				if ((flags & RPP_FORCEUPPER))
-					ch = (char)toupper((unsigned char)ch);
+	/* Turn off echo if possible. */
+	if (input != STDIN_FILENO && 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)
+			term.c_cc[VSTATUS] = _POSIX_VDISABLE;
+#endif
+		(void)tcsetattr(input, _T_FLUSH, &term);
+	} else {
+		memset(&term, 0, sizeof(term));
+		term.c_lflag |= ECHO;
+		memset(&oterm, 0, sizeof(oterm));
+		oterm.c_lflag |= ECHO;
+	}
+
+	/* No I/O if we are already backgrounded. */
+	if (signo[SIGTTOU] != 1 && signo[SIGTTIN] != 1) {
+		if (!(flags & RPP_STDIN))
+			(void)write(output, prompt, strlen(prompt));
+		end = buf + bufsiz - 1;
+		p = buf;
+		while ((nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r') {
+			if (p < end) {
+				if ((flags & RPP_SEVENBIT))
+					ch &= 0x7f;
+				if (isalpha(ch)) {
+					if ((flags & RPP_FORCELOWER))
+						ch = (char)tolower(ch);
+					if ((flags & RPP_FORCEUPPER))
+						ch = (char)toupper(ch);
+				}
+				*p++ = ch;
 			}
-			*p++ = ch;
 		}
+		*p = '\0';
+		save_errno = errno;
+		if (!(term.c_lflag & ECHO))
+			(void)write(output, "\n", 1);
 	}
-	*p = '\0';
-	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) {
-		while (tcsetattr(input, TCSAFLUSH|TCSASOFT, &oterm) == -1 &&
-		    errno == EINTR && !signo[SIGTTOU])
+		while (tcsetattr(input, _T_FLUSH, &oterm) == -1 &&
+		    errno == EINTR)
 			continue;
 	}
 	(void)sigaction(SIGALRM, &savealrm, NULL);
-- 
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