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cpu: add -n flag for the remote site to allow "none" authentification method (inspired from sources cpu-noauth patch)

--- a/sys/man/1/cpu

+++ b/sys/man/1/cpu

@@ -30,6 +30,8 @@

 .PP

 .B cpu

 [

+.B -n

+] [

 .B -A

 .I address

 ] [

@@ -127,6 +129,11 @@

 This is used if the local host is in a different protection domain than

 the server or if the user wants to log into the server as a different

 user.

+.TP

+.B none

+This skips authentication. This requires the

+.IR -n

+flag to be specified on the remote side.

 .PD

 .PP

 The

@@ -181,6 +188,16 @@

 of the 

 .I cpu

 protocol.

+The

+.B -n

+option allows using the

+.B none

+authentication method for incoming connections and must be

+specified before the

+.B -R

+and

+.B -O

+flags.

 .PP

 The

 .B -p

--- a/sys/src/cmd/cpu.c

+++ b/sys/src/cmd/cpu.c

@@ -30,6 +30,7 @@

 int	exportpid;

 char	*system;

 int	cflag;

+int	nflag;

 int	dbg;

 char	*user;

 char	*patternfile;

@@ -59,7 +60,7 @@

 {

 	{ "p9",		p9auth,		srvp9auth,},

 	{ "netkey",	netkeyauth,	netkeysrvauth,},

-//	{ "none",	noauth,		srvnoauth,},

+	{ "none",	noauth,		srvnoauth,},

 	{ nil,	nil}

 };

 AuthMethod *am = authmethod;	/* default is p9 */

@@ -176,6 +177,10 @@

 	case 'f':

 		/* ignored but accepted for compatibility */

 		break;

+	case 'n':

+		/* must be specified before -R/-O */

+		nflag++;

+		break;

 	case 'A':

 		anstring = EARGF(usage());

 		break;

@@ -349,7 +354,7 @@

 		if(n < 0)

 			fatal("authenticating: %r");

 	}

-	if(setamalg(cmd) < 0){

+	if(setamalg(cmd) < 0 || (nflag == 0 && am->sf == srvnoauth)) {

 		writestr(fd, "unsupported auth method", nil, 0);

 		fatal("bad auth method %s", cmd);

 	} else