This patch change djbdns's dnscache program so that it will ignore the
IP address given in the ignoreip file. I wrote this patch because of
Verisign's oh-so helpful wildcard A record for *.COM and *.NET.
If you have djbdns-1.05-ignoreip.patch installed, back it out like this:
cd /usr/local/src/djbdns-1.05
patch -R <djbdns-1.05-ignoreip.patch
Install the patch like this:
cd /usr/local/src/djbdns-1.05
patch <djbdns-1.05-ignoreip2.patch
svc -d /service/dnscache
make setup check
svc -u /service/dnscache
Configure it to ignore Verisign's wildcard record like this:
echo 64.94.110.11 >/service/dnscache/root/ignoreip
svc -t /service/dnscache
Configure it to ignore all the cretins like this:
awk '{print $2}' <<EOF >/service/dnscache/root/ignoreip
*.ac 194.205.62.122
*.cc 206.253.214.102
*.com 64.94.110.11
*.cx 219.88.106.80
*.museum 195.7.77.20
*.net 64.94.110.11
*.nu 64.55.105.9
and 212.181.91.6
*.ph 203.119.4.6
*.sh 194.205.62.62
*.tm 194.205.62.62
*.ws 216.35.187.246
EOF
svc -t /service/dnscache
J.P. Larocque contributes a script which updates root/ignoreip:
http://ely.ath.cx/~piranha/software/ignoreip-update/ignoreip-update-0.1
If root/ignoreip is not present, no addresses will be ignored.
--
--My blog is at angry-economist.russnelson.com | Free markets express in the
Crynwr sells support for free software | PGPok | practical world our belief
521 Pleasant Valley Rd. | +1 315 268 1925 voice | that there is that of God
Potsdam, NY 13676-3213 | +1 315 268 9201 FAX | in all people. -Chris V.
--- a/dnscache.c
+++ b/dnscache.c
@@ -24,6 +24,8 @@
#include "okclient.h"
#include "droproot.h"
+stralloc ignoreip = {0};
+
static int packetquery(char *buf,unsigned int len,char **q,char qtype[2],char qclass[2],char id[2])
{
unsigned int pos;
@@ -390,6 +392,7 @@ char seed[128];
int main()
{
char *x;
+ unsigned int i, j, k;
unsigned long cachesize;
signal(SIGPIPE, SIG_IGN);
@@ -433,6 +436,20 @@ int main()
if (!cache_init(cachesize))
strerr_die3x(111,FATAL,"not enough memory for cache of size ",x);
+ if (openreadclose("ignoreip",&ignoreip,64) < 0)
+ strerr_die2x(111,FATAL,"trouble reading ignoreip");
+ for(j = k = i = 0; i < ignoreip.len; i++)
+ if (ignoreip.s[i] == '\n') {
+ ignoreip.s[i] = '\0';
+ if (j + 4 > i)
+ strerr_die3x(111,FATAL,"badly malformed ip4 address ",ignoreip.s+k);
+ if (!ip4_scan(ignoreip.s+k,ignoreip.s+j))
+ strerr_die3x(111,FATAL,"unable to parse address in ignoreip ",ignoreip.s+k);
+ j += 4;
+ k = i + 1;
+ }
+ ignoreip.len = j;
+
if (env_get("HIDETTL"))
response_hidettl();
if (env_get("FORWARDONLY"))
--- a/query.c
+++ b/query.c
@@ -13,6 +13,8 @@
#include "response.h"
#include "query.h"
+extern stralloc ignoreip;
+
static int flagforwardonly = 0;
void query_forwardonly(void)
@@ -173,6 +175,7 @@ static int smaller(char *buf,unsigned in
static int doit(struct query *z,int state)
{
+ unsigned int ii;
char key[257];
char *cached;
unsigned int cachedlen;
@@ -662,6 +665,9 @@ static int doit(struct query *z,int stat
pos = dns_packet_copy(buf,len,pos,header,10); if (!pos) goto DIE;
if (byte_equal(header + 8,2,"\0\4")) {
pos = dns_packet_copy(buf,len,pos,header,4); if (!pos) goto DIE;
+ if (ignoreip.len)
+ for(ii = 0; ii < ignoreip.len; ii+= 4)
+ if (byte_equal(header,4,ignoreip.s+ii)) goto NXDOMAIN;
save_data(header,4);
log_rr(whichserver,t1,DNS_T_A,header,4,ttl);
}