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ndb/dnsdebug: add -c flag to debug caching dns server behaviour

--- a/sys/man/8/ndb

+++ b/sys/man/8/ndb

@@ -97,7 +97,7 @@

 .br

 .B ndb/dnsdebug

 [

-.B -rx

+.B -rxc

 ] [

 .B -f

 .I dbfile

@@ -758,6 +758,9 @@

 interface and

 .B /lib/ndb/external

 database file.

+The

+.B -c

+option enables caching which is handy for debugging the dns code.

 .PP

 .I Ndb/dnsgetip

 resolves and prints A and AAAA records without consulting

--- a/sys/src/cmd/ndb/dnsdebug.c

+++ b/sys/src/cmd/ndb/dnsdebug.c

@@ -56,9 +56,16 @@

 	case 'f':

 		dbfile = EARGF(usage());

 		break;

+	case 'c':

+		cfg.cachedb = 1;

+		break;

 	case 'r':

 		cfg.resolver = 1;

 		break;

+	case 'd':

+		debug = 1;

+		traceactivity = 1;

+		break;

 	case 'x':

 		dbfile = "/lib/ndb/external";

 		strcpy(mntpt, "/net.alt");

@@ -73,6 +80,7 @@

 	fmtinstall('R', prettyrrfmt);

 	opendatabase();

 	srand(truerand());

+	db2cache(1);

 	if(cfg.resolver)

 		squirrelserveraddrs();

@@ -89,7 +97,6 @@

 		p[Blinelen(&in)-1] = 0;

 		n = tokenize(p, f, 3);

 		if(n>=1) {

-			dnpurge();		/* flush the cache */

 			docmd(n, f);

 		}

 	}

@@ -457,6 +464,12 @@

 	name = type = nil;

 	tmpsrv = 0;

+	if(strcmp(f[0], "refresh") == 0){

+		db2cache(1);

+		dnageall(0);

+		return;

+	}

+

 	if(*f[0] == '@') {

 		if(setserver(f[0]+1) < 0)

 			return;

@@ -483,6 +496,7 @@

 	if(name == nil)

 		return;

+	if(!cfg.cachedb) dnpurge();		/* flush the cache */

 	doquery(name, type);

 	if(tmpsrv)