[source] ipip: Support fqdn as remote tunnel endpoint

[LEDE Commits]

jow pushed a commit to source.git, branch master:
https://git.lede-project.org/311682905edb56abd31c7ece3664910586070b91

commit 311682905edb56abd31c7ece3664910586070b91
Author: Hans Dedecker <dedeckeh at gmail.com>
AuthorDate: Tue Oct 25 22:50:04 2016 +0200

    ipip: Support fqdn as remote tunnel endpoint
    
    Signed-off-by: Hans Dedecker <dedeckeh at gmail.com>
---
 package/network/config/ipip/Makefile      |  4 ++--
 package/network/config/ipip/files/ipip.sh | 15 ++++++++++++++-
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/package/network/config/ipip/Makefile b/package/network/config/ipip/Makefile
index 5aa722d..9bdb13c 100644
--- a/package/network/config/ipip/Makefile
+++ b/package/network/config/ipip/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=ipip
 PKG_VERSION:=1
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_LICENSE:=GPL-2.0
 
 include $(INCLUDE_DIR)/package.mk
@@ -19,7 +19,7 @@ define Package/ipip
   CATEGORY:=Network
   MAINTAINER:=Hans Dedecker <dedeckeh at gmail.com>
   TITLE:=IP in IP Tunnel config support
-  DEPENDS:= +kmod-ipip
+  DEPENDS:= +kmod-ipip +resolveip
 endef
 
 define Package/ipip/description
diff --git a/package/network/config/ipip/files/ipip.sh b/package/network/config/ipip/files/ipip.sh
index 51c503f..f1c94d6 100755
--- a/package/network/config/ipip/files/ipip.sh
+++ b/package/network/config/ipip/files/ipip.sh
@@ -9,16 +9,29 @@
 
 proto_ipip_setup() {
 	local cfg="$1"
+	local remoteip
 
 	local df ipaddr peeraddr tunlink ttl tos zone mtu
 	json_get_vars df ipaddr peeraddr tunlink ttl tos zone mtu
 
 	[ -z "$peeraddr" ] && {
-		proto_notify_error "$cfg" "MISSING_ADDRESS"
+		proto_notify_error "$cfg" "MISSING_PEER_ADDRESS"
 		proto_block_restart "$cfg"
 		return
 	}
 
+	remoteip=$(resolveip -t 10 -4 "$peeraddr")
+
+	if [ -z "$remoteip" ]; then
+		proto_notify_error "$cfg" "PEER_RESOLVE_FAIL"
+		return
+	fi
+
+	for ip in $remoteip; do
+		peeraddr=$ip
+		break
+	done
+
 	( proto_add_host_dependency "$cfg" "$peeraddr" "$tunlink" )
 
 	[ -z "$ipaddr" ] && {