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mdns: guard against there being no ip4 address.

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* Avoid announcing to an interface with no ip4addr.

* Avoid emitting A answers if there is no ip4 address.
This commit is contained in:
Our Air Quality 2017-12-30 13:06:53 +11:00 committed by Dirk Ziegelmeier
parent a98d3a4efb
commit 1b57284bb4
1 changed files with 8 additions and 3 deletions
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11
src/apps/mdns/mdns.c
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@ -1421,7 +1421,8 @@ mdns_send_outpacket(struct mdns_outpacket *outpkt)
}
#endif
#if LWIP_IPV4
if (!(outpkt->host_replies & REPLY_HOST_A)) {
if (!(outpkt->host_replies & REPLY_HOST_A) &&
!ip4_addr_isany_val(*netif_ip4_addr(outpkt->netif))) {
res = mdns_add_a_answer(outpkt, outpkt->cache_flush, outpkt->netif);
if (res != ERR_OK) {
goto cleanup;
@ -1858,7 +1859,9 @@ mdns_resp_netif_settings_changed(struct netif *netif)
mdns_announce(netif, IP6_ADDR_ANY);
#endif
#if LWIP_IPV4
mdns_announce(netif, IP4_ADDR_ANY);
if (!ip4_addr_isany_val(*netif_ip4_addr(netif))) {
mdns_announce(netif, IP4_ADDR_ANY);
}
#endif
}
@ -2044,7 +2047,9 @@ mdns_resp_add_service(struct netif *netif, const char *name, const char *service
mdns_announce(netif, IP6_ADDR_ANY);
#endif
#if LWIP_IPV4
mdns_announce(netif, IP4_ADDR_ANY);
if (!ip4_addr_isany_val(*netif_ip4_addr(netif))) {
mdns_announce(netif, IP4_ADDR_ANY);
}
#endif
return slot;
}