inet: Create helper function for IP address checking

Create a helper function that checks if a given hostname is an IPv4
or IPv6 address. If it is, AF_INET or AF_INET6 is returned. On
error the negative error value from getaddrinfo is returned.

2 files changed, 21 insertions, 0 deletions

diff --git a/include/inet.h b/include/inet.h
index aa675737..8b9b390a 100644
--- a/include/inet.h
+++ b/include/inet.h
@@ -80,6 +80,7 @@ int connman_inet_setup_tunnel(char *tunnel, int mtu);
 int connman_inet_create_tunnel(char **iface);
 int connman_inet_get_dest_addr(int index, char **dest);
 int connman_inet_ipv6_get_dest_addr(int index, char **dest);
+int connman_inet_check_ipaddress(const char *host);
 connman_bool_t connman_inet_check_hostname(const char *ptr, size_t len);
 
 #ifdef __cplusplus
diff --git a/src/inet.c b/src/inet.c
index effa68c0..17d58d5c 100644
--- a/src/inet.c
+++ b/src/inet.c
@@ -2174,6 +2174,26 @@ int __connman_inet_rtnl_addattr32(struct nlmsghdr *n, size_t maxlen, int type,
 	return 0;
 }
 
+int connman_inet_check_ipaddress(const char *host)
+{
+	struct addrinfo hints;
+	struct addrinfo *addr;
+	int result;
+
+	memset(&hints, 0, sizeof(struct addrinfo));
+	hints.ai_flags = AI_NUMERICHOST;
+	addr = NULL;
+
+	result = getaddrinfo(host, NULL, &hints, &addr);
+	if (result == 0)
+		result = addr->ai_family;
+	else
+		result = -result;
+	freeaddrinfo(addr);
+
+	return result;
+}
+
 /* Check routine modified from ics-dhcp 4.2.3-P2 */
 connman_bool_t connman_inet_check_hostname(const char *ptr, size_t len)
 {