Add the openssh 6.8p1 readpassphrase implementation

This way glibc users don't have to fall back to getpass.

Windows users are still out of luck

configure.ac

@@ -423,6 +423,8 @@ if test "$bwin32" != true; then
   AC_CHECK_FUNCS(pthread_create)
 fi
 
+AM_CONDITIONAL(BUILD_READPASSPHRASE_C, test x$ac_cv_func_readpassphrase = xno && test $bwin32 = false)
+
 dnl ------------------------------------------------------
 dnl Where do you live, libevent?  And how do we call you?
 

src/common/compat.c

@@ -69,6 +69,8 @@
 #endif
 #ifdef HAVE_READPASSPHRASE_H
 #include <readpassphrase.h>
+#elif !defined(_WIN32)
+#include "readpassphrase.h"
 #endif
 
 #ifndef HAVE_GETTIMEOFDAY

src/common/include.am

@@ -51,6 +51,12 @@ if THREADS_WIN32
 threads_impl_source=src/common/compat_winthreads.c
 endif
 
+if BUILD_READPASSPHRASE_C
+readpassphrase_source=src/ext/readpassphrase.c
+else
+readpassphrase_source=
+endif
+
 LIBOR_A_SOURCES = \
   src/common/address.c					\
   src/common/backtrace.c				\
@@ -67,7 +73,8 @@ LIBOR_A_SOURCES = \
   src/ext/csiphash.c					\
   src/ext/trunnel/trunnel.c				\
   $(libor_extra_source)					\
-  $(threads_impl_source)
+  $(threads_impl_source)				\
+  $(readpassphrase_source)
 
 src/common/log.o: micro-revision.i
 

src/ext/readpassphrase.c

@@ -22,7 +22,7 @@
 
 /* OPENBSD ORIGINAL: lib/libc/gen/readpassphrase.c */
 
-#include "includes.h"
+#include "orconfig.h"
 
 #ifndef HAVE_READPASSPHRASE
 
@@ -35,6 +35,10 @@
 #include <string.h>
 #include <unistd.h>
 
+#ifndef _PATH_TTY
+# define _PATH_TTY "/dev/tty"
+#endif
+
 #ifdef TCSASOFT
 # define _T_FLUSH	(TCSAFLUSH|TCSASOFT)
 #else
@@ -61,6 +65,7 @@ static void handler(int);
 char *
 readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
 {
+	ssize_t bytes_written = 0;
 	ssize_t nr;
 	int input, output, save_errno, i, need_restart;
 	char ch, *p, *end;
@@ -132,7 +137,7 @@ restart:
 	/* 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));
+			bytes_written = write(output, prompt, strlen(prompt));
 		end = buf + bufsiz - 1;
 		p = buf;
 		while ((nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r') {
@@ -151,9 +156,11 @@ restart:
 		*p = '\0';
 		save_errno = errno;
 		if (!(term.c_lflag & ECHO))
-			(void)write(output, "\n", 1);
+			bytes_written = write(output, "\n", 1);
 	}
 
+	(void) bytes_written;
+
 	/* Restore old terminal settings and signals. */
 	if (memcmp(&term, &oterm, sizeof(term)) != 0) {
 		while (tcsetattr(input, _T_FLUSH, &oterm) == -1 &&

src/ext/readpassphrase.h

@@ -25,7 +25,7 @@
 #ifndef _READPASSPHRASE_H_
 #define _READPASSPHRASE_H_
 
-#include "includes.h"
+#include "orconfig.h"
 
 #ifndef HAVE_READPASSPHRASE
 
@@ -39,6 +39,8 @@
 
 char * readpassphrase(const char *, char *, size_t, int);
 
+#define HAVE_READPASSPHRASE
+
 #endif /* HAVE_READPASSPHRASE */
 
 #endif /* !_READPASSPHRASE_H_ */