Add osmo_sockaddr_size() to return the size of the variant used
Change-Id: I952b6bb752441fe019fc18f89bce4bbfbe58994a
diff --git a/include/osmocom/core/socket.h b/include/osmocom/core/socket.h
index 3ed9cc6..6bac87d 100644
--- a/include/osmocom/core/socket.h
+++ b/include/osmocom/core/socket.h
@@ -33,6 +33,29 @@
int osmo_sockaddr_is_local(struct sockaddr *addr, unsigned int addrlen);
int osmo_sockaddr_is_any(const struct osmo_sockaddr *addr);
+/*! Return the size of the variant used in the address
+ * NOTE: This does not return the size of the in{,6}_addr, but rather the size of the
+ * surrounding sockaddr_in{,6}.
+ * \param[in] addr the osmo_sockaddr to get the size of
+ * \return the size of the struct variant being used. If the value in sa_family is unsupported it will return
+ * the size of struct osmo_sockaddr. Returns 0 if addr is NULL. This way it can simply be a wrapper for sendto()
+ * which can be called with NULL/0 for dest_addr / addrlen (and then behaves like a send() call).
+ */
+static inline socklen_t osmo_sockaddr_size(const struct osmo_sockaddr *addr)
+{
+ if (!addr)
+ return 0;
+
+ switch (addr->u.sa.sa_family) {
+ case AF_INET:
+ return sizeof(struct sockaddr_in);
+ case AF_INET6:
+ return sizeof(struct sockaddr_in6);
+ default:
+ return sizeof(struct osmo_sockaddr);
+ }
+}
+
unsigned int osmo_sockaddr_to_str_and_uint(char *addr, unsigned int addr_len, uint16_t *port,
const struct sockaddr *sa);
size_t osmo_sockaddr_in_to_str_and_uint(char *addr, unsigned int addr_len, uint16_t *port,