Virgin import of ntpd 4.2.6p5.

When the series of commits is complete, things like
https://cert.litnet.lt/en/docs/ntp-distributed-reflection-dos-attacks
should be fixed.

PR:		bin/148836 (except that we import a newer version)
Asked by:	Too many
MFC after:	2 weeks

1 files changed, 51 insertions, 9 deletions

diff --git a/include/ntp_malloc.h b/include/ntp_malloc.h
index 099c83e..4cde62e 100644
--- a/include/ntp_malloc.h
+++ b/include/ntp_malloc.h
@@ -1,19 +1,61 @@
 /*
  * Define malloc and friends.
  */
-#ifndef  _ntp_malloc_h
-#define  _ntp_malloc_h
-
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+#ifndef NTP_MALLOC_H
+#define NTP_MALLOC_H
 
 #ifdef HAVE_STDLIB_H
 # include <stdlib.h>
-#else /* HAVE_STDLIB_H */
+#else
 # ifdef HAVE_MALLOC_H
 #  include <malloc.h>
 # endif
-#endif /* HAVE_STDLIB_H */
+#endif
+
+/*
+ * Deal with platform differences declaring alloca()
+ * This comes nearly verbatim from:
+ *
+ * http://www.gnu.org/software/autoconf/manual/autoconf.html#Particular-Functions
+ *
+ * The only modifications were to remove C++ support and guard against
+ * redefining alloca.
+ */
+#ifdef HAVE_ALLOCA_H
+# include <alloca.h>
+#elif defined __GNUC__
+# ifndef alloca
+#  define alloca __builtin_alloca
+# endif
+#elif defined _AIX
+# ifndef alloca
+#  define alloca __alloca
+# endif
+#elif defined _MSC_VER
+# include <malloc.h>
+# ifndef alloca
+#  define alloca _alloca
+# endif
+#else
+# include <stddef.h>
+void * alloca(size_t);
+#endif
+
+#ifdef EREALLOC_IMPL
+# define EREALLOC_CALLSITE	/* preserve __FILE__ and __LINE__ */
+#else
+# define EREALLOC_IMPL(ptr, newsz, filenm, loc) \
+	 realloc(ptr, (newsz))
+#endif
+
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+# define zero_mem(p, s)		bzero(p, s)
+#endif
+
+#ifndef zero_mem
+# define zero_mem(p, s)		memset(p, 0, s)
+#endif
+#define ZERO(var)		zero_mem(&(var), sizeof(var))
 
-#endif /* _ntp_malloc_h */
+#endif	/* NTP_MALLOC_H */