net/djbdns/patches/080-dnscache-cache-negatives.patch

   1 --- a/query.c
   2 +++ b/query.c
   3 @@ -193,6 +193,7 @@ static int doit(struct query *z,int stat
   4    int k;
   5    int p;
   6    int q;
   7 +  uint32 cachettl;
   8
   9    errno = error_io;
  10    if (state == 1) goto HAVEPACKET;
  11 @@ -470,6 +471,7 @@ static int doit(struct query *z,int stat
  12    rcode = header[3] & 15;
  13    if (rcode && (rcode != 3)) goto DIE; /* impossible; see irrelevant() */
  14
  15 +  cachettl = 0;
  16    flagout = 0;
  17    flagcname = 0;
  18    flagreferral = 0;
  19 @@ -512,6 +514,11 @@ static int doit(struct query *z,int stat
  20
  21      uint16_unpack_big(header + 8,&datalen);
  22      pos += datalen;
  23 +
  24 +    if (flagsoa && (pos <= len)) {
  25 +      cachettl = ttlget(buf + pos - 4);
  26 +      if (soattl < cachettl) cachettl = soattl;
  27 +    }
  28    }
  29    posglue = pos;
  30
  31 @@ -689,8 +696,8 @@ static int doit(struct query *z,int stat
  32    }
  33
  34    if (rcode == 3) {
  35 -    log_nxdomain(whichserver,d,soattl);
  36 -    cachegeneric(DNS_T_ANY,d,"",0,soattl);
  37 +    log_nxdomain(whichserver,d,cachettl);
  38 +    cachegeneric(DNS_T_ANY,d,"",0,cachettl);
  39
  40      NXDOMAIN:
  41      if (z->level) goto LOWERLEVEL;