commit 9b25329723e3284db7b060bbb301a139b8f2ace1
from: Russ Cox <rsc@swtch.com>
date: Fri Oct 12 16:55:19 2007 UTC

9pserve: add -n flag to reject auth by clients

commit - 4ff69507837bb2501cba25dfa219c252333cc185
commit + 9b25329723e3284db7b060bbb301a139b8f2ace1
blob - 9e319e60bd334c189a081f7d113eac50844fba28
blob + 388f24b6611ab2b7bb20dfbf4043f99bfda9778f
--- man/man4/9pserve.4
+++ man/man4/9pserve.4
@@ -4,7 +4,7 @@
 .SH SYNOPSIS
 .B 9pserve
 [
-.B -lv
+.B -lnv
 ]
 [
 .B -A
@@ -55,6 +55,11 @@ The options are:
 logging; write a debugging log to
 .IB addr .log \fR.
 .TP
+.B -n
+no authentication; respond to Tauth
+messages with an error (see 
+.IR attach (9P)).
+.TP
 .B -v
 verbose; more verbose when repeated
 .TP
blob - 1868808e5c313c5aee4a5fd2b25559d5d4deb22e
blob + 88e0f6fbfbbe4baa5aa4785e869b1657293b3dd0
--- src/cmd/9pserve.c
+++ src/cmd/9pserve.c
@@ -92,6 +92,7 @@ u32int xafid = NOFID;
 int attached;
 int versioned;
 int dotu;
+int noauth;
 
 void *gethash(Hash**, uint);
 int puthash(Hash**, uint, void*);
@@ -135,7 +136,7 @@ int cvtustat(Fcall*, uchar**, int);
 void
 usage(void)
 {
-	fprint(2, "usage: 9pserve [-lv] [-A aname afid] [-M msize] address\n");
+	fprint(2, "usage: 9pserve [-lnv] [-A aname afid] [-M msize] address\n");
 	fprint(2, "\treads/writes 9P messages on stdin/stdout\n");
 	threadexitsall("usage");
 }
@@ -164,6 +165,9 @@ threadmain(int argc, char **argv)
 	case 'M':
 		versioned = 1;
 		msize = atoi(EARGF(usage()));
+		break;
+	case 'n':
+		noauth = 1;
 		break;
 	case 'v':
 		verbose++;
@@ -448,6 +452,10 @@ connthread(void *arg)
 		case Tauth:
 			if(attached){
 				err(m, "authentication not required");
+				continue;
+			}
+			if(noauth){
+				err(m, "authentication rejected");
 				continue;
 			}
 			m->afid = fidnew(m->tx.afid);