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mdns: Update to drop our own packet if bounced back

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* Original commit: espressif/esp-idf@b5149e3ee7
This commit is contained in:
David Cermak
2022-02-04 18:18:49 +01:00
committed by suren-gabrielyan-espressif
parent e5a3a3df1d
commit 94ae672041
1 changed files with 22 additions and 4 deletions
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26
components/mdns/mdns.c
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@ -3237,6 +3237,28 @@ void mdns_parse_packet(mdns_rx_packet_t * packet)
mdns_debug_packet(data, len);
#endif
// Check if the packet wasn't sent by us
if (packet->ip_protocol == MDNS_IP_PROTOCOL_V4) {
esp_netif_ip_info_t if_ip_info;
if (esp_netif_get_ip_info(_mdns_get_esp_netif(packet->tcpip_if), &if_ip_info) == ESP_OK &&
memcmp(&if_ip_info.ip.addr, &packet->src.u_addr.ip4.addr, sizeof(esp_ip4_addr_t)) == 0) {
return;
}
#if CONFIG_LWIP_IPV6
} else {
struct esp_ip6_addr if_ip6;
if (esp_netif_get_ip6_linklocal(_mdns_get_esp_netif(packet->tcpip_if), &if_ip6) == ESP_OK &&
memcmp(&if_ip6, &packet->src.u_addr.ip6, sizeof(esp_ip6_addr_t)) == 0) {
return;
}
#endif
}
// Check for the minimum size of mdns packet
if (len <= MDNS_HEAD_ADDITIONAL_OFFSET) {
return;
}
mdns_parsed_packet_t * parsed_packet = (mdns_parsed_packet_t *)malloc(sizeof(mdns_parsed_packet_t));
if (!parsed_packet) {
HOOK_MALLOC_FAILED;
@ -3247,10 +3269,6 @@ void mdns_parse_packet(mdns_rx_packet_t * packet)
mdns_name_t * name = &n;
memset(name, 0, sizeof(mdns_name_t));
if (len <= MDNS_HEAD_ADDITIONAL_OFFSET) {
free(parsed_packet);
return;
}
header.id = _mdns_read_u16(data, MDNS_HEAD_ID_OFFSET);
header.flags.value = _mdns_read_u16(data, MDNS_HEAD_FLAGS_OFFSET);
header.questions = _mdns_read_u16(data, MDNS_HEAD_QUESTIONS_OFFSET);