flow: add accessors for flow addresses

Expose source and destination addresses as raw byte pointers, so FFI
callers do not need the internal FlowAddress layout.

rust/sys/src/sys.rs

@@ -1850,6 +1850,14 @@ extern "C" {
 extern "C" {
     pub fn SCFlowGetDestinationPort(flow: *const Flow) -> u16;
 }
+extern "C" {
+    #[doc = " \\brief Returns a borrowed raw pointer to the flow source address.\n\n The address is in network byte order. Use SCFlowIsIPv4 and SCFlowIsIPV6 to\n properly determine the size and family of the address."]
+    pub fn SCFlowGetSourceAddressAsRawPtr(flow: *const Flow) -> *const u8;
+}
+extern "C" {
+    #[doc = " \\brief Returns a borrowed raw pointer to the flow destination address.\n\n The address is in network byte order. Use SCFlowIsIPv4 and SCFlowIsIPV6 to\n properly determine the size and family of the address."]
+    pub fn SCFlowGetDestinationAddressAsRawPtr(flow: *const Flow) -> *const u8;
+}
 extern "C" {
     pub fn SCFlowGetToServerPacketCount(flow: *const Flow) -> u32;
 }

src/flow-bindgen.h

@@ -28,6 +28,22 @@ bool SCFlowIsIPv6(const Flow *flow);
 uint8_t SCFlowGetIPProtocol(const Flow *flow);
 uint16_t SCFlowGetSourcePort(const Flow *flow);
 uint16_t SCFlowGetDestinationPort(const Flow *flow);
+
+/**
+ * \brief Returns a borrowed raw pointer to the flow source address.
+ *
+ * The address is in network byte order. Use SCFlowIsIPv4 and SCFlowIsIPV6 to
+ * properly determine the size and family of the address.
+ */
+const uint8_t *SCFlowGetSourceAddressAsRawPtr(const Flow *flow);
+
+/**
+ * \brief Returns a borrowed raw pointer to the flow destination address.
+ *
+ * The address is in network byte order. Use SCFlowIsIPv4 and SCFlowIsIPV6 to
+ * properly determine the size and family of the address.
+ */
+const uint8_t *SCFlowGetDestinationAddressAsRawPtr(const Flow *flow);
 uint32_t SCFlowGetToServerPacketCount(const Flow *flow);
 uint32_t SCFlowGetToClientPacketCount(const Flow *flow);
 AppProto SCFlowGetAppProtocol(const Flow *f);

src/flow.c

@@ -1241,6 +1241,16 @@ uint16_t SCFlowGetSourcePort(const Flow *flow)
     return flow->sp;
 }
 
+const uint8_t *SCFlowGetSourceAddressAsRawPtr(const Flow *flow)
+{
+    return flow->src.address.address_un_data8;
+}
+
+const uint8_t *SCFlowGetDestinationAddressAsRawPtr(const Flow *flow)
+{
+    return flow->dst.address.address_un_data8;
+}
+
 /**
  * \brief Return true if the flow is IPv4.
  */