From 32dda672d0d2013f8bc4e0730296e8a9ddaa2401 Mon Sep 17 00:00:00 2001
From: Vsevolod Stakhov <vsevolod@highsecure.ru>
Date: Sun, 3 Jan 2016 11:35:45 +0000
Subject: [PATCH] Add method to check if IP is local

---
 src/libutil/addr.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 src/libutil/addr.h |  5 +++++
 2 files changed, 48 insertions(+)

diff --git a/src/libutil/addr.c b/src/libutil/addr.c
index e87fa5261..747ac869e 100644
--- a/src/libutil/addr.c
+++ b/src/libutil/addr.c
@@ -1314,3 +1314,46 @@ rspamd_inet_address_equal (gconstpointer a, gconstpointer b)
 
 	return rspamd_inet_address_compare (a1, a2) == 0;
 }
+
+#ifndef IN6_IS_ADDR_LOOPBACK
+#define	IN6_IS_ADDR_LOOPBACK(a)		\
+	((*(const __uint32_t *)(const void *)(&(a)->s6_addr[0]) == 0) && \
+	(*(const __uint32_t *)(const void *)(&(a)->s6_addr[4]) == 0) && \
+	(*(const __uint32_t *)(const void *)(&(a)->s6_addr[8]) == 0) && \
+	(*(const __uint32_t *)(const void *)(&(a)->s6_addr[12]) == ntohl(1)))
+#endif
+#ifndef IN6_IS_ADDR_LINKLOCAL
+#define IN6_IS_ADDR_LINKLOCAL(a)	\
+	(((a)->s6_addr[0] == 0xfe) && (((a)->s6_addr[1] & 0xc0) == 0x80))
+#endif
+#ifndef IN6_IS_ADDR_SITELOCAL
+#define IN6_IS_ADDR_SITELOCAL(a)	\
+	(((a)->s6_addr[0] == 0xfe) && (((a)->s6_addr[1] & 0xc0) == 0xc0))
+#endif
+
+gboolean
+rspamd_inet_address_is_local (const rspamd_inet_addr_t *addr)
+{
+	g_assert (addr != NULL);
+
+	if (addr->af == AF_UNIX) {
+		/* Always true for unix sockets */
+		return TRUE;
+	}
+	else {
+		if (addr->af == AF_INET) {
+			if (addr->u.in.addr.s4.sin_addr.s_addr == INADDR_LOOPBACK) {
+				return TRUE;
+			}
+		}
+		else if (addr->af == AF_INET6) {
+			if (IN6_IS_ADDR_LOOPBACK (&addr->u.in.addr.s6.sin6_addr) ||
+						IN6_IS_ADDR_LINKLOCAL (&addr->u.in.addr.s6.sin6_addr) ||
+						IN6_IS_ADDR_SITELOCAL (&addr->u.in.addr.s6.sin6_addr)) {
+				return TRUE;
+			}
+		}
+	}
+
+	return FALSE;
+}
diff --git a/src/libutil/addr.h b/src/libutil/addr.h
index fa2e4e65b..36f9910fd 100644
--- a/src/libutil/addr.h
+++ b/src/libutil/addr.h
@@ -260,4 +260,9 @@ guint rspamd_inet_address_hash (gconstpointer a);
  */
 gboolean rspamd_inet_address_equal (gconstpointer a, gconstpointer b);
 
+/**
+ * Returns TRUE if an address belongs to some local address
+ */
+gboolean rspamd_inet_address_is_local (const rspamd_inet_addr_t *addr);
+
 #endif /* ADDR_H_ */
-- 
2.39.5