From 1565d76bd6ff2d1064c3d30e947dc70613417853 Mon Sep 17 00:00:00 2001
From: Steven Barth <steven@midlink.org>
Date: Tue, 3 Dec 2013 22:00:33 +0100
Subject: [PATCH] Fix prefix class logic

---
 CMakeLists.txt  |  5 +++++
 src/dhcpv6-ia.c |  6 ++++--
 src/odhcpd.c    |  7 +++----
 src/odhcpd.h    |  2 +-
 src/ubus.c      | 14 ++++++++------
 5 files changed, 21 insertions(+), 13 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 891dc41..09173e4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,6 +10,11 @@ set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -g -std=c99")
 
 add_definitions(-D_GNU_SOURCE -Wall -Werror -Wextra -DWITH_UBUS)
 
+if(${EXT_PREFIX_CLASS})
+	add_definitions(-DEXT_PREFIX_CLASS=${EXT_PREFIX_CLASS})
+endif(${EXT_PREFIX_CLASS})
+
+
 add_executable(odhcpd src/odhcpd.c src/config.c src/router.c src/dhcpv6.c src/ndp.c src/md5.c src/dhcpv6-ia.c src/dhcpv4.c src/ubus.c)
 target_link_libraries(odhcpd resolv ubus ubox uci)
 
diff --git a/src/dhcpv6-ia.c b/src/dhcpv6-ia.c
index 3d9fe83..b0a31a2 100644
--- a/src/dhcpv6-ia.c
+++ b/src/dhcpv6-ia.c
@@ -900,8 +900,10 @@ size_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
 				a->assigned = reqhint;
 				a->all_class = class_oro;
 				a->classes_cnt = classes_cnt;
-				a->classes = malloc(classes_cnt * sizeof(uint16_t));
-				memcpy(a->classes, classes, classes_cnt * sizeof(uint16_t));
+				if (classes_cnt) {
+					a->classes = malloc(classes_cnt * sizeof(uint16_t));
+					memcpy(a->classes, classes, classes_cnt * sizeof(uint16_t));
+				}
 
 				if (first)
 					memcpy(a->key, first->key, sizeof(a->key));
diff --git a/src/odhcpd.c b/src/odhcpd.c
index 5a800b7..d6ca298 100644
--- a/src/odhcpd.c
+++ b/src/odhcpd.c
@@ -244,10 +244,9 @@ ssize_t odhcpd_get_interface_addresses(int ifindex,
 		addrs[ret].class = 0;
 #ifdef WITH_UBUS
 		struct interface *iface = odhcpd_get_interface_by_index(ifindex);
-		if (iface) {
-			addrs[ret].has_class = true;
-			addrs[ret].class = ubus_get_class(iface->ifname, &addrs[ret].addr);
-		}
+		if (iface)
+			addrs[ret].has_class = ubus_get_class(iface->ifname,
+					&addrs[ret].addr, &addrs[ret].class);
 #endif
 		++ret;
 	}
diff --git a/src/odhcpd.h b/src/odhcpd.h
index 510dd6a..727c638 100644
--- a/src/odhcpd.h
+++ b/src/odhcpd.h
@@ -195,7 +195,7 @@ int init_ubus(void);
 const char* ubus_get_ifname(const char *name);
 void ubus_apply_network(void);
 bool ubus_has_prefix(const char *name, const char *ifname);
-uint16_t ubus_get_class(const char *ifname, const struct in6_addr *addr);
+bool ubus_get_class(const char *ifname, const struct in6_addr *addr, uint16_t *pclass);
 #endif
 
 
diff --git a/src/ubus.c b/src/ubus.c
index 317a9c1..dbb43a6 100644
--- a/src/ubus.c
+++ b/src/ubus.c
@@ -364,13 +364,13 @@ static const struct blobmsg_policy addr_attrs[ADDR_ATTR_MAX] = {
 	[ADDR_ATTR_CLASS] = { .name = "class", .type = BLOBMSG_TYPE_STRING },
 };
 
-uint16_t ubus_get_class(const char *ifname, const struct in6_addr *addr)
+bool ubus_get_class(const char *ifname, const struct in6_addr *addr, uint16_t *pclass)
 {
 	struct blob_attr *c, *cur;
 	unsigned rem;
 
 	if (!dump)
-		return 0;
+		return false;
 
 	blobmsg_for_each_attr(c, dump, rem) {
 		struct blob_attr *tb[IFACE_ATTR_MAX];
@@ -401,15 +401,17 @@ uint16_t ubus_get_class(const char *ifname, const struct in6_addr *addr)
 				struct in6_addr ip6addr;
 				inet_pton(AF_INET6, addrs, &ip6addr);
 
-				if (IN6_ARE_ADDR_EQUAL(&ip6addr, addr))
-					return atoi(class);
+				if (IN6_ARE_ADDR_EQUAL(&ip6addr, addr)) {
+					*pclass = atoi(class);
+					return true;
+				}
 			}
 		}
 
-		return 0;
+		return false;
 	}
 
-	return 0;
+	return false;
 }
 
 
-- 
2.11.0