From d90e699ca2566289cddc68cd0862d05780b54551 Mon Sep 17 00:00:00 2001
From: Apple <opensource@apple.com>
Date: Thu, 12 Oct 2017 18:02:04 +0000
Subject: [PATCH] Libinfo-517.30.1.tar.gz

---
 lookup.subproj/getaddrinfo.3 | 36 +++++++++++++++++++++++++++++++++++-
 lookup.subproj/libinfo.c     |  4 ++++
 lookup.subproj/netdb.h       |  4 ++++
 3 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/lookup.subproj/getaddrinfo.3 b/lookup.subproj/getaddrinfo.3
index 333fb40..be60d3e 100644
--- a/lookup.subproj/getaddrinfo.3
+++ b/lookup.subproj/getaddrinfo.3
@@ -252,9 +252,38 @@ is defined as (
 |
 .Dv AI_ADDRCONFIG
 ).
+.It Dv AI_UNUSABLE
+To override the automatic
+.Dv AI_DEFAULT
+behavior that occurs when
+.Fa ai_flags
+is zero pass
+.Dv AI_UNUSABLE
+instead of zero.
+This suppresses the implicit setting of
+.Dv AI_V4MAPPED_CFG
+and
+.Dv AI_ADDRCONFIG ,
+thereby causing unusable addresses to be included in the results.
 .El
 .El
 .Pp
+If
+.Fa ai_flags
+is zero,
+.Fn getaddrinfo
+gives the
+.Dv AI_DEFAULT
+behavior (
+.Dv AI_V4MAPPED_CFG
+|
+.Dv AI_ADDRCONFIG
+). To override this default behavior, pass any nonzero value for
+.Fa ai_flags ,
+by setting any desired flag values, or setting
+.Dv AI_UNUSABLE
+if no other flags are desired.
+.Pp
 All other elements of the
 .Li addrinfo
 structure passed via
@@ -272,7 +301,12 @@ with
 set to
 .Dv PF_UNSPEC
 and all other elements set to zero or
-.Dv NULL .
+.Dv NULL
+(which includes treating the
+.Fa ai_flags
+field as effectively zero, giving the automatic default
+.Dv AI_DEFAULT
+behavior).
 .Pp
 After a successful call to
 .Fn getaddrinfo ,
diff --git a/lookup.subproj/libinfo.c b/lookup.subproj/libinfo.c
index 93921cc..e263f03 100755
--- a/lookup.subproj/libinfo.c
+++ b/lookup.subproj/libinfo.c
@@ -2354,6 +2354,8 @@ _getaddrinfo_internal(const char *nodename, const char *servname, const struct a
 		flags = hints->ai_flags;
 	}
 
+	if (flags == 0) flags = AI_DEFAULT;
+
 #ifdef CALL_TRACE
 	fprintf(stderr, "-> %s %s %s %u %u %u 0x%08x %s\n", __func__, nodename, servname, family, socktype, protocol, flags, (interface == NULL) ? "" : interface);
 #endif
@@ -2631,6 +2633,8 @@ _getaddrinfo_interface_async_call(const char *nodename, const char *servname, co
 		flags = hints->ai_flags;
 	}
 
+	if (flags == 0) flags = AI_DEFAULT;
+
 #ifdef CALL_TRACE
 	fprintf(stderr, ">> %s %s %s %u %u %u 0x%08x\n", __func__, nodename, servname, family, socktype, protocol, flags);
 #endif
diff --git a/lookup.subproj/netdb.h b/lookup.subproj/netdb.h
index 762d465..ea30449 100644
--- a/lookup.subproj/netdb.h
+++ b/lookup.subproj/netdb.h
@@ -228,6 +228,10 @@ struct rpcent {
 /* special recommended flags for getipnodebyname */
 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 #define	AI_DEFAULT	(AI_V4MAPPED_CFG | AI_ADDRCONFIG)
+/* If the hints pointer is null or ai_flags is zero, getaddrinfo() automatically defaults to the AI_DEFAULT behavior.
+ * To override this default behavior, thereby causing unusable addresses to be included in the results, pass any nonzero
+ * value for ai_flags, by setting any desired flag values, or by setting AI_UNUSABLE if no other flags are desired. */
+#define	AI_UNUSABLE	0x10000000 /* return addresses even if unusable (i.e. opposite of AI_DEFAULT) */
 #endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
 
 /*
-- 
2.7.4