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mdns : Add mdns_add_service_subtype_ptr_answer() function that write answer of the subtype service PTR RR to outpacket

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Abdellatif IDIRY 2021-10-25 10:57:25 +02:00
parent 2355f4bb24
commit 5886ff8c95
1 changed files with 38 additions and 1 deletions
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39
src/apps/mdns/mdns_out.c
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@ -54,7 +54,7 @@
/* Function prototypes */
static void mdns_clear_outmsg(struct mdns_outmsg *outmsg);
mdns_add_service_subtype_ptr_answer(struct mdns_outpacket *reply, struct mdns_outmsg *msg, struct mdns_service *service);
/**
* Call user supplied function to setup TXT data
* @param service The service to build TXT record for
@ -660,6 +660,8 @@ mdns_create_outpacket(struct netif *netif, struct mdns_outmsg *msg,
if (msg->serv_replies[i] & REPLY_SERVICE_NAME_PTR) {
res = mdns_add_servicename_ptr_answer(outpkt, msg, service);
/*if a subtype is used, that following function write answer of the subtype service PTR RR to outpacket*/
res = mdns_add_service_subtype_ptr_answer(outpkt, msg, service);
if (res != ERR_OK) {
return res;
}
@ -1160,4 +1162,39 @@ mdns_send_request(struct mdns_request *req, struct netif *netif, const ip_addr_t
}
#endif
/** Write an all subtype services -> PTR RR to outpacket */
static err_t
mdns_add_service_subtype_ptr_answer(struct mdns_outpacket *reply, struct mdns_outmsg *msg,
struct mdns_service *service)
{
err_t res = ERR_OK;
u8_t subtyes_index;
u32_t ttl = MDNS_TTL_4500;
struct mdns_domain service_type, sub_service;
for(subtyes_index=0;subtyes_index < LWIP_MIN(service->subtypes_nbr,MDNS_MAX_SERVICES_SUBTYPES); subtyes_index++)
{
res =mdns_build_subtype_service_domain(&sub_service, service,subtyes_index);
res =mdns_build_service_domain(&service_type, service, 1);
/* When answering to a legacy querier, we need to repeat the question and
* limit the ttl to the short legacy ttl */
if(msg->legacy_query) {
/* Repeating the question only needs to be done for the question asked
* (max one question), not for the additional records. */
if(reply->questions < 1) {
LWIP_DEBUGF(MDNS_DEBUG, ("MDNS: Add question for legacy query\n"));
res = mdns_add_question(reply, &sub_service, DNS_RRTYPE_PTR, DNS_RRCLASS_IN, 0);
if (res != ERR_OK) {
return res;
}
reply->questions = 1;
}
/* ttl of legacy answer may not be greater then 10 seconds */
ttl = MDNS_TTL_10;
}
LWIP_DEBUGF(MDNS_DEBUG, ("MDNS: Responding with service type PTR record\n"));
res =mdns_add_answer(reply, &sub_service, DNS_RRTYPE_PTR, DNS_RRCLASS_IN,
0, ttl, NULL, 0, &service_type);
}
return res;
}
#endif /* LWIP_MDNS_RESPONDER */