res_hep: Adds hostname resolution support for capture_address

Previously, only an IP address would be accepted for the capture_address config
setting in hep.conf.  This change allows capture_address to be a resolvable
hostname or an IP address.

ASTERISK-27796 #close
Reported-By: Sebastian Gutierrez

Change-Id: I33e1a37a8b86e20505dadeda760b861a9ef51f6f

res/res_hep.c

@@ -367,6 +367,27 @@ static void hepv3_data_dtor(void *obj)
 	}
 }
 
+/*! \brief Pulls first resolved address and returns it */
+static int ast_sockaddr_resolve_first_af(struct ast_sockaddr *addr,
+				      const char* name, int flag, int family)
+{
+	struct ast_sockaddr *addrs;
+	int addrs_cnt;
+
+	addrs_cnt = ast_sockaddr_resolve(&addrs, name, flag, family);
+	if (addrs_cnt <= 0) {
+		return 1;
+	}
+	if (addrs_cnt > 1) {
+		ast_debug(1, "Multiple addresses resolving %s, using the first one only\n", name);
+	}
+
+	ast_sockaddr_copy(addr, &addrs[0]);
+
+	ast_free(addrs);
+	return 0;
+}
+
 /*! \brief Allocate the HEPv3 run-time data */
 static struct hepv3_runtime_data *hepv3_data_alloc(struct hepv3_global_config *config)
 {
@@ -379,10 +400,11 @@ static struct hepv3_runtime_data *hepv3_data_alloc(struct hepv3_global_config *c
 
 	data->sockfd = -1;
 
-	if (!ast_sockaddr_parse(&data->remote_addr, config->capture_address, PARSE_PORT_REQUIRE)) {
+	if (ast_sockaddr_resolve_first_af(&data->remote_addr, config->capture_address, PARSE_PORT_REQUIRE, AST_AF_UNSPEC)) {
 		ast_log(AST_LOG_WARNING, "Failed to create address from %s\n", config->capture_address);
 		ao2_ref(data, -1);
 		return NULL;
+
 	}
 
 	data->sockfd = socket(ast_sockaddr_is_ipv6(&data->remote_addr) ? AF_INET6 : AF_INET, SOCK_DGRAM, 0);