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mdns: fix bit order issue in DNS header flags

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The bit field in the header flags does not match its intended order on
little endian machines. The PR removes the bit field and uses bit
operations instead.
This commit is contained in:
Jiacheng Guo
2022-07-26 15:01:49 +08:00
committed by David Cermak
parent 85ba60e405
commit c4e85bd099
2 changed files with 15 additions and 27 deletions
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22
components/mdns/mdns.c
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@ -1686,7 +1686,7 @@ static void _mdns_create_answer_from_parsed_packet(mdns_parsed_packet_t *parsed_
if (!packet) {
return;
}
packet->flags = MDNS_FLAGS_AUTHORITATIVE;
packet->flags = MDNS_FLAGS_QR_AUTHORITATIVE;
packet->distributed = parsed_packet->distributed;
packet->id = parsed_packet->id;
@ -1935,7 +1935,7 @@ static mdns_tx_packet_t * _mdns_create_announce_packet(mdns_if_t tcpip_if, mdns_
if (!packet) {
return NULL;
}
packet->flags = MDNS_FLAGS_AUTHORITATIVE;
packet->flags = MDNS_FLAGS_QR_AUTHORITATIVE;
uint8_t i;
for (i=0; i<len; i++) {
@ -1965,7 +1965,7 @@ static mdns_tx_packet_t * _mdns_create_announce_from_probe(mdns_tx_packet_t * pr
if (!packet) {
return NULL;
}
packet->flags = MDNS_FLAGS_AUTHORITATIVE;
packet->flags = MDNS_FLAGS_QR_AUTHORITATIVE;
mdns_out_answer_t * s = probe->servers;
while (s) {
@ -2005,7 +2005,7 @@ static void _mdns_pcb_send_bye(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protoco
if (!packet) {
return;
}
packet->flags = MDNS_FLAGS_AUTHORITATIVE;
packet->flags = MDNS_FLAGS_QR_AUTHORITATIVE;
size_t i;
for (i=0; i<len; i++) {
if (!_mdns_alloc_answer(&packet->answers, MDNS_TYPE_PTR, services[i]->service, NULL, true, true)) {
@ -3342,13 +3342,13 @@ void mdns_parse_packet(mdns_rx_packet_t * packet)
memset(name, 0, sizeof(mdns_name_t));
header.id = _mdns_read_u16(data, MDNS_HEAD_ID_OFFSET);
header.flags.value = _mdns_read_u16(data, MDNS_HEAD_FLAGS_OFFSET);
header.flags = _mdns_read_u16(data, MDNS_HEAD_FLAGS_OFFSET);
header.questions = _mdns_read_u16(data, MDNS_HEAD_QUESTIONS_OFFSET);
header.answers = _mdns_read_u16(data, MDNS_HEAD_ANSWERS_OFFSET);
header.servers = _mdns_read_u16(data, MDNS_HEAD_SERVERS_OFFSET);
header.additional = _mdns_read_u16(data, MDNS_HEAD_ADDITIONAL_OFFSET);
if (header.flags.value == MDNS_FLAGS_AUTHORITATIVE && packet->src_port != MDNS_SERVICE_PORT) {
if (header.flags == MDNS_FLAGS_QR_AUTHORITATIVE && packet->src_port != MDNS_SERVICE_PORT) {
free(parsed_packet);
return;
}
@ -3362,8 +3362,8 @@ void mdns_parse_packet(mdns_rx_packet_t * packet)
parsed_packet->tcpip_if = packet->tcpip_if;
parsed_packet->ip_protocol = packet->ip_protocol;
parsed_packet->multicast = packet->multicast;
parsed_packet->authoritative = header.flags.value == MDNS_FLAGS_AUTHORITATIVE;
parsed_packet->distributed = header.flags.value == MDNS_FLAGS_DISTRIBUTED;
parsed_packet->authoritative = (header.flags == MDNS_FLAGS_QR_AUTHORITATIVE);
parsed_packet->distributed = header.flags == MDNS_FLAGS_DISTRIBUTED;
parsed_packet->id = header.id;
esp_netif_ip_addr_copy(&parsed_packet->src, &packet->src);
parsed_packet->src_port = packet->src_port;
@ -3499,7 +3499,7 @@ void mdns_parse_packet(mdns_rx_packet_t * packet)
service = _mdns_get_service_item(name->service, name->proto, NULL);
}
} else {
if (!header.flags.qr || record_type == MDNS_NS) {
if ((header.flags & MDNS_FLAGS_QUERY_REPSONSE) == 0 || record_type == MDNS_NS) {
//skip this record
continue;
}
@ -6075,11 +6075,11 @@ void mdns_debug_packet(const uint8_t * data, size_t len)
header.additional = _mdns_read_u16(data, MDNS_HEAD_ADDITIONAL_OFFSET);
_mdns_dbg_printf("%s",
(header.flags.value == MDNS_FLAGS_AUTHORITATIVE)?"AUTHORITATIVE\n":
(header.flags.value == MDNS_FLAGS_QR_AUTHORITATIVE)?"AUTHORITATIVE\n":
(header.flags.value == MDNS_FLAGS_DISTRIBUTED)?"DISTRIBUTED\n":
(header.flags.value == 0)?"\n":" "
);
if (header.flags.value && header.flags.value != MDNS_FLAGS_AUTHORITATIVE) {
if (header.flags.value && header.flags.value != MDNS_FLAGS_QR_AUTHORITATIVE) {
_mdns_dbg_printf("0x%04X\n", header.flags.value);
}