diff options
| -rw-r--r-- | networking/dnsd.c | 27 |
1 files changed, 10 insertions, 17 deletions
diff --git a/networking/dnsd.c b/networking/dnsd.c index 5dbaec1eb..56ede3fca 100644 --- a/networking/dnsd.c +++ b/networking/dnsd.c @@ -24,15 +24,10 @@ #define DEBUG 0 enum { - /* Can tweak this */ + /* can tweak this */ DEFAULT_TTL = 120, -/* Cannot get bigger packets than 512 per RFC1035. - * In practice this can be set considerably smaller: - * Length of response packet is header (12B) + 2*type(4B) + 2*class(4B) + - * ttl(4B) + rlen(2B) + r (MAX_NAME_LEN = 21B) + - * 2*querystring (2 MAX_NAME_LEN = 42B), all together 90 Bytes - */ + /* cannot get bigger packets than 512 per RFC1035. */ MAX_PACK_LEN = 512, IP_STRING_LEN = sizeof(".xxx.xxx.xxx.xxx"), MAX_NAME_LEN = IP_STRING_LEN - 1 + sizeof(".in-addr.arpa"), @@ -225,9 +220,9 @@ OPCODE 0 standard query (QUERY) 2 server status request (STATUS) AA Authoritative Answer - this bit is valid in responses. Responding name server is an authority for the domain name - in question section. Answer section may have multiple owner names - because of aliases. The AA bit corresponds to the name which matches - the query name, or the first owner name in the answer section. + in question section. Answer section may have multiple owner names + because of aliases. The AA bit corresponds to the name which matches + the query name, or the first owner name in the answer section. TC TrunCation - this message was truncated. RD Recursion Desired - this bit may be set in a query and is copied into the response. If RD is set, it directs @@ -240,10 +235,10 @@ RCODE Response code. 0 No error condition 1 Format error 2 Server failure - server was unable to process the query - due to a problem with the name server. + due to a problem with the name server. 3 Name Error - meaningful only for responses from - an authoritative name server. The referenced domain name - does not exist. + an authoritative name server. The referenced domain name + does not exist. 4 Not Implemented. 5 Refused. QDCOUNT number of entries in the question section. @@ -293,7 +288,7 @@ QTYPE a two octet type of the query. 255 a request for all records QCLASS a two octet code that specifies the class of the query. 1 the Internet - (others are historic only) + (others are historic only) 255 any class 4.1.3. Resource record format @@ -464,9 +459,7 @@ int dnsd_main(int argc UNUSED_PARAM, char **argv) unsigned lsa_size; int udps, opts; uint16_t port = 53; - /* Paranoid sizing: querystring x2 + ttl + outr_rlen + answstr */ - /* I'd rather see process_packet() fixed instead... */ - uint8_t buf[MAX_PACK_LEN * 2 + 4 + 2 + (MAX_NAME_LEN+1)]; + uint8_t buf[MAX_PACK_LEN + 1]; opts = getopt32(argv, "vi:c:t:p:d", &listen_interface, &fileconf, &sttl, &sport); //if (opts & 0x1) // -v |