Fix the dnsbug, this time right.

Reference: /n/patches.lsub.org/patch/dnsfix
Date: Fri Oct 26 11:06:54 CES 2012
Signed-off-by: paurea@lsub.org

--- /sys/src/cmd/ndb/dnresolve.c	Thu Apr 26 19:11:12 2012
+++ /sys/src/cmd/ndb/dnresolve.c	Fri Oct 26 11:05:25 2012
@@ -832,7 +832,7 @@
 	Dest *cur;
 
 	if(nd >= Maxdest)		/* dest array is full? */
-		return Maxdest - 1;
+		return Maxdest;
 
 	/*
 	 *  look for a server whose address we already know.
@@ -978,7 +978,7 @@
 {
 	int rv = -1, nfd;
 	char *domain;
-	char conndir[40], net[40];
+	char conndir[NETPATHLEN], net[NETPATHLEN];
 	uchar belen[2];
 	NetConnInfo *nci;
 
@@ -1080,13 +1080,12 @@
 	 */
 	if (qp->ndest > qp->curdest - p) {
 		j = serveraddrs(qp, qp->curdest - p, depth);
-		if (j < 0 || j >= Maxdest) {
+		if (j < 0 || j > Maxdest) {
 			dnslog("serveraddrs() result %d out of range", j);
 			abort();
 		}
 		qp->curdest = &qp->dest[j];
 	}
-	destck(qp->curdest);
 
 	/* no servers, punt */
 	if (qp->ndest == 0)
@@ -1441,7 +1440,7 @@
 			/* remove all addrs of responding server from list */
 			for(np = qp->dest; np < qp->curdest; np++)
 				if(np->s == p->s)
-					p->nx = Maxtrans;
+					np->nx = Maxtrans;
 
 			/* free or incorporate RRs in m */
 			rv = procansw(qp, &m, srcip, depth, p);
--- /sys/src/libc/9sys/dial.c	Thu Jul  5 10:19:03 2012
+++ /sys/src/libc/9sys/dial.c	Fri Oct 26 10:50:33 2012
@@ -45,7 +45,7 @@
 
 	int	dfd;
 	int	cfd;
-	char	dir[NETPATHLEN+1];
+	char	dir[NETPATHLEN];
 	char	err[ERRMAX];
 };
 struct Dest {
@@ -227,7 +227,7 @@
 		*ds->cfdp = conn->cfd;
 	if (ds->dir) {
 		strncpy(ds->dir, conn->dir, NETPATHLEN);
-		ds->dir[NETPATHLEN] = '\0';
+		ds->dir[NETPATHLEN-1] = '\0';
 	}
 	return conn->dfd;
 }