Updated chan_sip to place calls on hold if SDP address in INVITE is ANY

This patch fixes the case where an INVITE is received with c=0.0.0.0 or ::.
In this case, the call should be placed on hold.  Previously, we checked for
the address being null; this patch keeps that behavior but also checks for
the ANY IP addresses.

Review: https://reviewboard.asterisk.org/r/1504/

(closes issue ASTERISK-18086)
Reported by: James Bottomley
Tested by: Matt Jordan


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@340164 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -8494,6 +8494,17 @@ static int get_ip_and_port_from_sdp(struct sip_request *req, const enum media_ty
 	return 0;
 }
 
+/*! \internal
+ * \brief Returns whether or not the address is null or ANY / unspecified (0.0.0.0 or ::)
+ * \retval TRUE if the address is null or any
+ * \retval FALSE if the address it not null or any
+ * \note In some circumstances, calls should be placed on hold if either of these conditions exist.
+ */
+static int sockaddr_is_null_or_any(const struct ast_sockaddr *addr)
+{
+	return ast_sockaddr_isnull(addr) || ast_sockaddr_is_any(addr);
+}
+
 /*! \brief Process SIP SDP offer, select formats and activate RTP channels
 	If offer is rejected, we will not change any properties of the call
  	Return 0 on success, a negative value on errors.
@@ -9075,7 +9086,7 @@ static int process_sdp(struct sip_pvt *p, struct sip_request *req, int t38action
 		/* Activate a re-invite */
 		ast_queue_frame(p->owner, &ast_null_frame);
 		change_hold_state(p, req, FALSE, sendonly);
-	} else if ((ast_sockaddr_isnull(sa) && ast_sockaddr_isnull(vsa) && ast_sockaddr_isnull(tsa) && ast_sockaddr_isnull(isa)) || (sendonly && sendonly != -1)) {
+	} else if ((sockaddr_is_null_or_any(sa) && sockaddr_is_null_or_any(vsa) && sockaddr_is_null_or_any(tsa) && sockaddr_is_null_or_any(isa)) || (sendonly && sendonly != -1)) {
 		ast_queue_control_data(p->owner, AST_CONTROL_HOLD,
 				       S_OR(p->mohsuggest, NULL),
 				       !ast_strlen_zero(p->mohsuggest) ? strlen(p->mohsuggest) + 1 : 0);