Add cfmakeraw() for systems without it.

MANIFEST

@@ -109,6 +109,7 @@ lib/util/aix.c
 lib/util/arc4random.c
 lib/util/arc4random.h
 lib/util/arc4random_uniform.c
+lib/util/cfmakeraw.c
 lib/util/chacha_private.h
 lib/util/closefrom.c
 lib/util/digest.c

config.h.in

@@ -82,6 +82,9 @@
 /* Define to 1 to enable BSM audit support. */
 #undef HAVE_BSM_AUDIT
 
+/* Define to 1 if you have the `cfmakeraw' function. */
+#undef HAVE_CFMAKERAW
+
 /* Define to 1 if you have the `clock_gettime' function. */
 #undef HAVE_CLOCK_GETTIME
 

configure

@@ -19638,6 +19638,32 @@ done
 	fi
 	;;
 esac
+for ac_func in cfmakeraw
+do :
+  ac_fn_c_check_func "$LINENO" "cfmakeraw" "ac_cv_func_cfmakeraw"
+if test "x$ac_cv_func_cfmakeraw" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_CFMAKERAW 1
+_ACEOF
+
+else
+
+    case " $LIBOBJS " in
+  *" cfmakeraw.$ac_objext "* ) ;;
+  *) LIBOBJS="$LIBOBJS cfmakeraw.$ac_objext"
+ ;;
+esac
+
+
+    for _sym in sudo_cfmakeraw; do
+	COMPAT_EXP="${COMPAT_EXP}${_sym}
+"
+    done
+
+
+fi
+done
+
 for ac_func in getgrouplist
 do :
   ac_fn_c_check_func "$LINENO" "getgrouplist" "ac_cv_func_getgrouplist"

configure.ac

@@ -2574,6 +2574,10 @@ case "$host_os" in
 	fi
 	;;
 esac
+AC_CHECK_FUNCS([cfmakeraw], [], [
+    AC_LIBOBJ(cfmakeraw)
+    SUDO_APPEND_COMPAT_EXP(sudo_cfmakeraw)
+])
 AC_CHECK_FUNCS([getgrouplist], [], [
     case "$host_os" in
     aix*)

include/sudo_compat.h

@@ -392,7 +392,13 @@ int getdomainname(char *, size_t);
 struct passwd;
 struct stat;
 struct timespec;
+struct termios;
 
+#ifndef HAVE_CFMAKERAW
+__dso_public void sudo_cfmakeraw(struct termios *term);
+# undef cfmakeraw
+# define cfmakeraw(_a) sudo_cfmakeraw((_a))
+#endif /* HAVE_CFMAKERAW */
 #ifndef HAVE_CLOSEFROM
 __dso_public void sudo_closefrom(int);
 # undef closefrom

lib/util/cfmakeraw.c

@@ -0,0 +1,59 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2019 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/types.h>
+#include <termios.h>
+
+#include "sudo_compat.h"
+
+/* Non-standard termios input flags */
+#ifndef IUCLC
+# define IUCLC		0
+#endif
+#ifndef IMAXBEL
+# define IMAXBEL	0
+#endif
+
+/* Non-standard termios local flags */
+#ifndef IEXTEN
+# define IEXTEN		0
+#endif
+
+/*
+ * Set termios to raw mode (BSD extension).
+ */
+void
+sudo_cfmakeraw(struct termios *term)
+{
+    /* Set terminal to raw mode */
+    CLR(term->c_iflag,
+	IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON|IMAXBEL|IUCLC);
+    CLR(term->c_oflag, OPOST);
+    CLR(term->c_lflag, ECHO|ECHONL|ICANON|ISIG|IEXTEN);
+    CLR(term->c_cflag, CSIZE|PARENB);
+    SET(term->c_cflag, CS8);
+    term->c_cc[VMIN] = 1;
+    term->c_cc[VTIME] = 0;
+}