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mdns: Fix parsing non-standard queries

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Fix for packets containing unexpected domains, such as openthread.thread.home.arpa.
If we find this packet we set the name entry as invalid, but continue with parsing as the packet might contain related queries for us.

Closes https://github.com/espressif/esp-idf/issues/7694
This commit is contained in:
David Cermak 2021-10-19 16:55:16 +02:00
parent 75e2705269
commit d16f9bade5
1 changed files with 3 additions and 1 deletions
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4
components/mdns/mdns.c
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@ -310,6 +310,7 @@ static const uint8_t * _mdns_read_fqdn(const uint8_t * packet, const uint8_t * s
buf[len] = '\0';
if (name->parts == 1 && buf[0] != '_'
&& (strcasecmp(buf, MDNS_DEFAULT_DOMAIN) != 0)
&& (strcasecmp(buf, "arpa") != 0)
&& (strcasecmp(buf, "ip6") != 0)
&& (strcasecmp(buf, "in-addr") != 0)) {
strlcat(name->host, ".", sizeof(name->host));
@ -2793,7 +2794,8 @@ static const uint8_t * _mdns_parse_fqdn(const uint8_t * packet, const uint8_t *
if (strcasecmp(name->domain, MDNS_DEFAULT_DOMAIN) == 0 || strcasecmp(name->domain, "arpa") == 0) {
return next_data;
}
return 0;
name->invalid = true; // mark the current name invalid, but continue with other question
return next_data;
}
/**