From 08396c87d0058d5091ba6d4002b6559f1d41ae5b Mon Sep 17 00:00:00 2001
From: Baptiste Assmann <bedis9@gmail.com>
Date: Sun, 31 Jan 2016 00:27:17 +0100
Subject: [PATCH] MINOR: standard.c: ipcpy() function to copy an IP address
 from a struct sockaddr_storage into an other one

The function ipcpy() simply duplicates the IP address found in one
struct sockaddr_storage into an other struct sockaddr_storage.
It also update the family on the destination structure.

Memory of destination structure must be allocated and cleared by the
caller.
---
 include/common/standard.h |  6 ++++++
 src/standard.c            | 21 +++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/include/common/standard.h b/include/common/standard.h
index bc1ab403d..d4f2448ef 100644
--- a/include/common/standard.h
+++ b/include/common/standard.h
@@ -886,6 +886,12 @@ extern int v6tov4(struct in_addr *sin_addr, struct in6_addr *sin6_addr);
  */
 int ipcmp(struct sockaddr_storage *ss1, struct sockaddr_storage *ss2);
 
+/* copy ip from <source> into <dest>
+ * the caller must clear <dest> before calling.
+ * Returns a pointer to the destination
+ */
+struct sockaddr_storage *ipcpy(struct sockaddr_storage *source, struct sockaddr_storage *dest);
+
 char *human_time(int t, short hz_div);
 
 extern const char *monthname[];
diff --git a/src/standard.c b/src/standard.c
index d85c72020..5937b482f 100644
--- a/src/standard.c
+++ b/src/standard.c
@@ -2588,6 +2588,27 @@ int ipcmp(struct sockaddr_storage *ss1, struct sockaddr_storage *ss2)
 	return 1;
 }
 
+/* copy IP address from <source> into <dest>
+ * the caller must allocate and clear <dest> before calling.
+ * Returns a pointer to the destination.
+ */
+struct sockaddr_storage *ipcpy(struct sockaddr_storage *source, struct sockaddr_storage *dest)
+{
+	dest->ss_family = source->ss_family;
+
+	/* copy new addr and apply it */
+	switch (source->ss_family) {
+		case AF_INET:
+			((struct sockaddr_in *)dest)->sin_addr.s_addr = ((struct sockaddr_in *)source)->sin_addr.s_addr;
+			break;
+		case AF_INET6:
+			memcpy(((struct sockaddr_in6 *)dest)->sin6_addr.s6_addr, ((struct sockaddr_in6 *)source)->sin6_addr.s6_addr, sizeof(struct in6_addr));
+			break;
+	}
+
+	return dest;
+}
+
 char *human_time(int t, short hz_div) {
 	static char rv[sizeof("24855d23h")+1];	// longest of "23h59m" and "59m59s"
 	char *p = rv;