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snoopy: dns: add caa record type, fix rrtypestr()

--- a/sys/src/cmd/ip/snoopy/dns.c

+++ b/sys/src/cmd/ip/snoopy/dns.c

@@ -68,12 +68,13 @@

 [Tmailb]	"mailb",

 [Tmaila]	"maila",

 [Tall]		"all",

+[Tcaa]		"caa",

 		0,

 };

 static char*

 rrtypestr(int t)

 {

-	char buf[20];

+	static char buf[20];

 	if(t >= 0 && t < nelem(rrtname) && rrtname[t])

 		return rrtname[t];

@@ -140,7 +141,8 @@

 		break;

 	case Ttxt:

 		for(t=rr->txt; t; t=t->next)

-			m->p = seprint(m->p, m->e, " txt=\"%.*s\"", t->dlen, (char*)t->data);

+			m->p = seprint(m->p, m->e, " txt=\"%.*s\"",

+				t->dlen, (char*)t->data);

 		break;

 	case Tnull:

 		m->p = seprint(m->p, m->e, " null=%.*H",

@@ -167,6 +169,10 @@

 			rr->cert->type, rr->cert->tag, rr->cert->alg,

 			rr->cert->dlen, rr->cert->data);

 		break;

+	case Tcaa:

+		m->p = seprint(m->p, m->e, " flags=%d tag=%s caa=\"%.*s\"",

+			rr->caa->flags, rr->caa->tag->name,

+			rr->caa->dlen, (char*)rr->caa->data);

 	}

 	rrfree(rr);

 }