From 3b3955b203f6408bf20eef47b445eb1df5e099af Mon Sep 17 00:00:00 2001
From: Pau Espin Pedrol <pespin@sysmocom.de>
Date: Tue, 4 Oct 2022 12:38:49 +0200
Subject: [PATCH] socket: Introduce API osmo_sockaddr_is_any

Change-Id: I2810a889fc14052d0e0be6a2b500ad4e5088ffa9
---
 TODO-RELEASE                  |  1 +
 include/osmocom/core/socket.h |  1 +
 src/socket.c                  | 20 ++++++++++++++++++++
 3 files changed, 22 insertions(+)

diff --git a/TODO-RELEASE b/TODO-RELEASE
index 8ccfa491e..436d417cb 100644
--- a/TODO-RELEASE
+++ b/TODO-RELEASE
@@ -7,3 +7,4 @@
 # If any interfaces have been added since the last public release: c:r:a + 1.
 # If any interfaces have been removed or changed since the last public release: c:r:0.
 #library	what			description / commit summary line
+libosmocore new API osmo_sockaddr_is_any()
\ No newline at end of file
diff --git a/include/osmocom/core/socket.h b/include/osmocom/core/socket.h
index 79de6c5a7..06db5d0ed 100644
--- a/include/osmocom/core/socket.h
+++ b/include/osmocom/core/socket.h
@@ -31,6 +31,7 @@ struct osmo_sockaddr {
 };
 
 int osmo_sockaddr_is_local(struct sockaddr *addr, unsigned int addrlen);
+int osmo_sockaddr_is_any(const struct osmo_sockaddr *addr);
 
 unsigned int osmo_sockaddr_to_str_and_uint(char *addr, unsigned int addr_len, uint16_t *port,
 					   const struct sockaddr *sa);
diff --git a/src/socket.c b/src/socket.c
index 4605db4c0..3d945e75b 100644
--- a/src/socket.c
+++ b/src/socket.c
@@ -1175,6 +1175,26 @@ int osmo_sockaddr_is_local(struct sockaddr *addr, unsigned int addrlen)
 	return 0;
 }
 
+/*! Determine if the given address is an ANY address ("0.0.0.0", "::"). Port is not checked.
+ *  \param[in] addr Socket Address
+ *  \param[in] addrlen Length of socket address in bytes
+ *  \returns 1 if address is ANY, 0 otherwise. -1 is address family not supported/detected.
+ */
+int osmo_sockaddr_is_any(const struct osmo_sockaddr *addr)
+{
+	switch (addr->u.sa.sa_family) {
+	case AF_INET6: {
+		struct in6_addr ip6_any = IN6ADDR_ANY_INIT;
+		return memcmp(&addr->u.sin6.sin6_addr,
+			      &ip6_any, sizeof(ip6_any)) == 0;
+		}
+	case AF_INET:
+		return addr->u.sin.sin_addr.s_addr == INADDR_ANY;
+	default:
+		return -1;
+	}
+}
+
 /*! Convert sockaddr_in to IP address as char string and port as uint16_t.
  *  \param[out] addr  String buffer to write IP address to, or NULL.
  *  \param[out] addr_len  Size of \a addr.