From 75cf5706b536fbb401a7127fea1ef925eff3d24b Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Thu, 23 Aug 2001 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 2001-08-23

---
 ip/il.c       | 13 +++++++---
 port/chan.c   |  4 ++-
 port/devssl.c | 69 +++++++++++++++------------------------------------
 3 files changed, 32 insertions(+), 54 deletions(-)

diff --git a/ip/il.c b/ip/il.c
index 129bd60d7f31447d50b8cfd922e993b5720af380..192976fde4a30632f42e01400f29e1a7269242c8 100644
--- a/ip/il.c
+++ b/ip/il.c
@@ -537,7 +537,7 @@ iliput(Proto *il, Ipifc*, Block *bp)
 	uchar laddr[IPaddrlen];
 	ushort sp, dp, csum;
 	int plen, illen;
-	Conv *s;
+	Conv *new, *s;
 	Ilpriv *ipriv;
 
 	ipriv = il->priv;
@@ -596,14 +596,15 @@ iliput(Proto *il, Ipifc*, Block *bp)
 			goto raise;
 		}
 
-		s = Fsnewcall(s, raddr, dp, laddr, sp);
-		if(s == nil){
+		new = Fsnewcall(s, raddr, dp, laddr, sp);
+		if(new == nil){
 			qunlock(il);
 			netlog(il->f, Logil, "il: bad newcall %I/%ud->%ud\n", raddr, sp, dp);
 			ilsendctl(s, ih, Ilclose, 0, nhgetl(ih->ilid), 0);
 			goto raise;
 		}
-	
+		s = new;
+
 		ic = (Ilcb*)s->ptcl;
 	
 		ic->conv = s;
@@ -1014,6 +1015,10 @@ ilsendctl(Conv *ipc, Ilhdr *inih, int type, ulong id, ulong ack, int ilspec)
 
 	if(ilcksum)
 		hnputs(ih->ilsum, ptclcsum(bp, IL_IPSIZE, IL_HDRSIZE));
+if(ipc==nil)
+	panic("ipc is nil caller is %.8lux", getcallerpc(&ipc));
+if(ipc->p==nil)
+	panic("ipc->p is nil");
 
 	netlog(ipc->p->f, Logilmsg, "ctl(%s id %d ack %d %d->%d)\n",
 		iltype[ih->iltype], nhgetl(ih->ilid), nhgetl(ih->ilack), 
diff --git a/port/chan.c b/port/chan.c
index 4e975a3b61a5d869051373d934a881ad698a6799..494dcea91509614d5b4f15d02b65c9f36648b598 100644
--- a/port/chan.c
+++ b/port/chan.c
@@ -1099,7 +1099,9 @@ if(c->umh != nil){
 	print("cunique umh\n");
 	putmhead(c->umh);
 }
-			if(c->qid.type&QTDIR)
+
+			/* only save the mount head if it's a multiple element union */
+			if(m && m->mount && m->mount->next)
 				c->umh = m;
 			else
 				putmhead(m);
diff --git a/port/devssl.c b/port/devssl.c
index 598355ea0f7504dd79f850d5ada21cafd3421fd3..aa301f0cc841f0cb624ef6b93704676988eeef13 100644
--- a/port/devssl.c
+++ b/port/devssl.c
@@ -70,20 +70,19 @@ struct Dstate
 	int	perm;
 };
 
-Lock	dslock;
-int	dshiwat;
-int	maxdstate = 128;
-char	**dsname;
-Dstate	**dstate;
-char	*encalgs;
-char	*hashalgs;
-
 enum
 {
 	Maxdmsg=	1<<16,
-	Maxdstate=	64
+	Maxdstate=	128,	/* must be a power of 2 */
 };
 
+Lock	dslock;
+int	dshiwat;
+char	*dsname[Maxdstate];
+Dstate	*dstate[Maxdstate];
+char	*encalgs;
+char	*hashalgs;
+
 enum{
 	Qtopdir		= 1,	/* top level directory */
 	Qprotodir,
@@ -1173,12 +1172,6 @@ sslinit(void)
 	int n;
 	char *cp;
 
-	if((dstate = smalloc(sizeof(Dstate*) * maxdstate)) == 0)
-		panic("sslinit");
-
-	if((dsname = smalloc(sizeof(char*) * maxdstate)) == 0)
-		panic("sslinit");
-
 	n = 1;
 	for(e = encrypttab; e->name != nil; e++)
 		n += strlen(e->name) + 1;
@@ -1397,6 +1390,10 @@ buftochan(char *p)
 	if(fd < 0)
 		error(Ebadarg);
 	c = fdtochan(fd, -1, 0, 1);	/* error check and inc ref */
+	if(devtab[c->type] == &ssldevtab){
+		cclose(c);
+		error("cannot ssl encrypt devssl files");
+	}
 	return c;
 }
 
@@ -1422,51 +1419,25 @@ sslhangup(Dstate *s)
 static Dstate*
 dsclone(Chan *ch)
 {
-	Dstate **pp, **ep, **np;
-	char **names;
-	int newmax;
+	int i;
+	Dstate *ret;
 
 	if(waserror()) {
 		unlock(&dslock);
 		nexterror();
 	}
 	lock(&dslock);
-	ep = &dstate[maxdstate];
-	for(pp = dstate; pp < ep; pp++) {
-		if(*pp == 0) {
-			dsnew(ch, pp);
+	ret = nil;
+	for(i=0; i<Maxdstate; i++){
+		if(dstate[i] == nil){
+			dsnew(ch, &dstate[i]);
+			ret = dstate[i];
 			break;
 		}
 	}
-	if(pp >= ep) {
-		if(maxdstate >= Maxdstate) {
-			unlock(&dslock);
-			poperror();
-			return 0;
-		}
-		newmax = 2 * maxdstate;
-		if(newmax > Maxdstate)
-			newmax = Maxdstate;
-
-		np = smalloc(sizeof(Dstate*) * newmax);
-		if(np == 0)
-			error(Enomem);
-		memmove(np, dstate, sizeof(Dstate*) * maxdstate);
-		dstate = np;
-		pp = &dstate[maxdstate];
-
-		names = smalloc(sizeof(char*) * newmax);
-		if(names == 0)
-			error(Enomem);
-		memmove(names, dsname, sizeof(char*) * maxdstate);
-		dsname = names;
-
-		maxdstate = newmax;
-		dsnew(ch, pp);
-	}
 	unlock(&dslock);
 	poperror();
-	return *pp;
+	return ret;
 }
 
 static void