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mdns: Revert support for queries in responses, mDNS non-strict mode

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This reverts backporting commits to v4.1 related to mDNS non-strict mode
and the related fix for resolving the non-strict mode:
* Revert "mdns: Allow resolve its own non-strict answers"
  This reverts commit 0182a84c2b.
* Revert "mdns: Support queries in responses in mDNS non-strict mode"
  This reverts commit 12e86a7c1b.
This commit is contained in:
David Cermak 2021-01-15 12:26:41 +01:00
parent 22c82a4e28
commit 31ecdcd3f6
2 changed files with 7 additions and 35 deletions
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26
components/mdns/mdns.c
View File

@ -1313,17 +1313,6 @@ static void _mdns_create_answer_from_parsed_packet(mdns_parsed_packet_t * parsed
_mdns_free_tx_packet(packet);
return;
}
#ifdef MDNS_REPEAT_QUERY_IN_RESPONSE
mdns_out_question_t * out_question = malloc(sizeof(mdns_out_question_t));
if (out_question == NULL) {
HOOK_MALLOC_FAILED;
_mdns_free_tx_packet(packet);
return;
}
memcpy(out_question, q, sizeof(mdns_out_question_t));
out_question->next = NULL;
queueToEnd(mdns_out_question_t, packet->questions, out_question);
#endif // MDNS_REPEAT_QUERY_IN_RESPONSE
} else if (!_mdns_alloc_answer(&packet->answers, q->type, NULL, send_flush, false)) {
_mdns_free_tx_packet(packet);
return;
@ -2753,7 +2742,7 @@ void mdns_parse_packet(mdns_rx_packet_t * packet)
}
}
if (header.questions && !parsed_packet->questions && !parsed_packet->discovery && !header.answers) {
if (header.questions && !parsed_packet->questions && !parsed_packet->discovery) {
goto clear_rx_packet;
} else if (header.answers || header.servers || header.additional) {
uint16_t recordIndex = 0;
@ -2796,14 +2785,13 @@ void mdns_parse_packet(mdns_rx_packet_t * packet)
if (parsed_packet->discovery && _mdns_name_is_discovery(name, type)) {
discovery = true;
} else {
if (!name->sub && _mdns_name_is_ours(name)) {
ours = true;
if (name->service && name->service[0] && name->proto && name->proto[0]) {
service = _mdns_get_service_item(name->service, name->proto);
}
} else if (!name->sub && _mdns_name_is_ours(name)) {
ours = true;
if (name->service && name->service[0] && name->proto && name->proto[0]) {
service = _mdns_get_service_item(name->service, name->proto);
}
if (!parsed_packet->authoritative || record_type == MDNS_NS) {
} else {
if (header.questions || !parsed_packet->authoritative || record_type == MDNS_NS) {
//skip this record
continue;
}

16
components/mdns/private_include/mdns_private.h
View File

@ -23,22 +23,6 @@
#define _mdns_dbg_printf(...) printf(__VA_ARGS__)
#endif
/** mDNS strict mode: Set this to 1 for the mDNS library to strictly follow the RFC6762:
* Strict features:
* - to do not set original questions in response packets per RFC6762, sec 6
*
* The actual configuration is 0, i.e. non-strict mode, since some implementations,
* such as lwIP mdns resolver (used by standard POSIX API like getaddrinfo, gethostbyname)
* could not correctly resolve advertised names.
*/
#define MDNS_STRICT_MODE 0
#if !MDNS_STRICT_MODE
/* mDNS responders sometimes repeat queries in responses
* but according to RFC6762, sec 6: Responses MUST NOT contain
* any item in question field */
#define MDNS_REPEAT_QUERY_IN_RESPONSE 1
#endif
/** The maximum number of services */
#define MDNS_MAX_SERVICES CONFIG_MDNS_MAX_SERVICES