// When a new named instance of a service is found, FoundInstance() is called.
// In this sample code we turn around and immediately issue a query to resolve that service name to
// find its address, port, and txtinfo, but a normal browing application would just display the name.
static void FoundInstance(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord)
{
#pragma unused (question)
SearcherServices *services = (SearcherServices *)question->QuestionContext;
linkedServiceInfo *info;
debugf("FoundInstance %##s PTR %##s", answer->name->c, answer->rdata->u.name.c);
if (answer->rrtype != kDNSType_PTR) return;
if (!services) { debugf("FoundInstance: services is NULL"); return; }
info = (linkedServiceInfo *)OTAllocMem(sizeof(linkedServiceInfo));
if (!info) { services->lostRecords = true; return; }
info->i.name = answer->rdata->u.name;
info->i.InterfaceID = answer->InterfaceID;
info->i.ip.type = mDNSAddrType_IPv4;
info->i.ip.ip.v4 = zerov4Addr;
info->i.port = zeroIPPort;
info->add = AddRecord;
info->dom = mDNSfalse;
if (!AddRecord) // If TTL == 0 we're deleting a service,
OTLIFOEnqueue(&services->serviceinfolist, &info->link);
else // else we're adding a new service
{
ServiceInfoQuery *q = (ServiceInfoQuery *)OTAllocMem(sizeof(ServiceInfoQuery));
if (!q) { OTFreeMem(info); services->lostRecords = true; return; }
mDNS_StartResolveService(m, q, &info->i, FoundInstanceInfo, services);
}
}
static void
foobar_manage_service(mDNS *m, const ResourceRecord *answer,
const domainlabel *name, bool add)
{
if (add) {
mStatus status;
service_info_query *siq =
calloc(1, sizeof(*siq));
assert(siq != NULL);
siq->next = service_info_query_list;
service_info_query_list = siq;
siq->info.name = answer->rdata->u.name;
siq->info.InterfaceID = answer->InterfaceID;
status = mDNS_StartResolveService(m, &siq->query, &siq->info,
foobar_service_info, NULL);
assert(status == mStatus_NoError);
} else {
service_info_query *cur = service_info_query_list;
service_info_query *prev = cur;
while (cur != NULL && !SameDomainLabel(&name->c[0],
&cur->info.name.c[0])) {
prev = cur;
cur = cur->next;
}
if (cur != NULL) {
if (prev != cur) {
prev->next = cur->next;
} else {
service_info_query_list = cur->next;
}
mDNS_StopResolveService(m, &cur->query);
free(cur);
}
}
}
