code: drawterm

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Add -9 flag for 9p-mode (just exportfs on standard input/output)

With the -9 flag, we can run drawterm on a remote system
over ssh, and have it export the remotes namespace.

Thru the /cmd interface (see os(1)), one can launch native
programs on the remote host and access the remote file system.

--- a/cpu.c

+++ b/cpu.c

@@ -27,6 +27,7 @@

 static int	norcpu;

 static int	nokbd;

 static int	nogfx;

+static int	nineflag;

 static char	*ealgs = "rc4_256 sha1";

@@ -176,7 +177,7 @@

 	atexit(rcpuexit);

 	/* Begin serving the namespace */

-	exportfs(fd);

+	exportfs(fd, fd);

 }

 void

@@ -236,13 +237,13 @@

 	write(fd, "OK", 2);

 	/* Begin serving the gnot namespace */

-	exportfs(fd);

+	exportfs(fd, fd);

 }

 void

 usage(void)

 {

-	fprint(2, "usage: %s [-GBO] "

+	fprint(2, "usage: %s [-9GBO] "

 		"[-h host] [-u user] [-a authserver] [-s secstore] "

 		"[-e 'crypt hash'] [-k keypattern] "

 		"[-p] [-t timeout] "

@@ -262,12 +263,13 @@

 	char *s;

 	user = getenv("USER");

-	if((pass = getenv("PASS")) != nil)

-		remove("/env/PASS");

 	host = getenv("cpu");

 	authserver = getenv("auth");

 	ARGBEGIN{

+	case '9':

+		nineflag = 1;

+		/* wet floor */

 	case 'G':

 		nogfx = 1;

 		/* wet floor */

@@ -320,8 +322,8 @@

 		break;

 	case 'g':

 		/* X11 geometry string

-			[=][<width>{xX}<height>][{+-}<xoffset>{+-}<yoffset>]

-			*/

+		 *	[=][<width>{xX}<height>][{+-}<xoffset>{+-}<yoffset>]

+		 */

 		geometry = EARGF(usage());

 		break;

 	default:

@@ -330,6 +332,14 @@

 	if(argc != 0)

 		usage();

+

+	if(nineflag){

+		exportfs(lfdfd(0), lfdfd(1));

+		return;

+	}

+

+	if((pass = getenv("PASS")) != nil)

+		remove("/env/PASS");

 	if(!nogfx)

 		guimain();

--- a/drawterm.1

+++ b/drawterm.1

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

 .SH SYNOPSIS

 .B drawterm

 [

-.B -GBO

+.B -9GBO

 ] [

 .B -h

 .I host

@@ -49,6 +49,12 @@

 .PP

 The options are:

 .PD

+

+.TP

+.B -9

+Start drawterm in 9P mode;

+exporting the namespace over 9P on standard input and output.

+Graphics and keyboard input are disabled.

 .TP

 .B -G

--- a/drawterm.h

+++ b/drawterm.h

@@ -2,7 +2,7 @@

 extern char *secstore;

 extern char *secstorefetch(char *addr, char *owner, char *passwd);

 extern char *authserver;

-extern int exportfs(int);

+extern int exportfs(int, int);

 extern int dialfactotum(void);

 extern char *getuser(void);

 extern void cpumain(int, char**);

--- a/exportfs/exportfs.c

+++ b/exportfs/exportfs.c

@@ -9,7 +9,6 @@

 #define Extern

 #include "exportfs.h"

-/* #define QIDPATH	((1LL<<48)-1) */

 #define QIDPATH	((((vlong)1)<<48)-1)

 vlong newqid = 0;

@@ -21,15 +20,16 @@

 int	qidcnt;

 int	qfreecnt;

 int	ncollision;

-int	netfd;

+int	netfd[2];

 int

-exportfs(int fd)

+exportfs(int rfd, int wfd)

 {

 	char buf[ERRMAX], ebuf[ERRMAX];

 	Fsrpc *r;

 	int i, n;

+

 	fcalls[Tversion] = Xversion;

 	fcalls[Tauth] = Xauth;

 	fcalls[Tflush] = Xflush;

@@ -45,22 +45,18 @@

 	fcalls[Twstat] = Xwstat;

 	srvfd = -1;

-	netfd = fd;

-	//dbg = 1;

+	netfd[0] = rfd;

+	netfd[1] = wfd;

 	strcpy(buf, "this is buf");

 	strcpy(ebuf, "this is ebuf");

 	DEBUG(DFD, "exportfs: started\n");

-//	rfork(RFNOTEG);

-

-	messagesize = iounit(netfd);

+	messagesize = iounit(rfd);

 	if(messagesize == 0)

 		messagesize = IOUNIT+IOHDRSZ;

 	Workq = emallocz(sizeof(Fsrpc)*Nr_workbufs);

-//	for(i=0; i<Nr_workbufs; i++)

-//		Workq[i].buf = emallocz(messagesize);

 	fhash = emallocz(sizeof(Fid*)*FHASHSIZE);

 	fmtinstall('F', fcallfmt);

@@ -78,7 +74,7 @@

 			fatal("Out of service buffers");

 		DEBUG(DFD, "read9p...");

-		n = read9pmsg(netfd, r->buf, messagesize);

+		n = read9pmsg(netfd[0], r->buf, messagesize);

 		if(n <= 0)

 			fatal(nil);

@@ -122,7 +118,7 @@

 	if(data == nil)

 		fatal(Enomem);

 	n = convS2M(t, data, messagesize);

-	if((m=write(netfd, data, n))!=n){

+	if((m=write(netfd[1], data, n))!=n){

 		iprint("wrote %d got %d (%r)\n", n, m);

 		fatal("write");

 	}

--- a/exportfs/exportsrv.c

+++ b/exportfs/exportsrv.c

@@ -15,7 +15,7 @@

 char Eversion[] = "Bad 9P2000 version";

 void*

-emallocz(ulong n)

+emallocz(uint n)

 {

 	void *v;

--- a/kern/devlfd-win32.c

+++ b/kern/devlfd-win32.c

@@ -23,6 +23,26 @@

 	return c;

 }

+/*

+ * only good for stdin/stdout/stderr

+ */

+int

+lfdfd(int fd)

+{

+	HANDLE h;

+

+	switch(fd){

+	case 0: h = GetStdHandle(STD_INPUT_HANDLE); break;

+	case 1: h = GetStdHandle(STD_OUTPUT_HANDLE); break;

+	case 2: h = GetStdHandle(STD_ERROR_HANDLE); break;

+	default:

+		return -1;

+	}

+	if(h == INVALID_HANDLE_VALUE)

+		return -1;

+	return newfd(lfdchan((void*)h));

+}

+

 static Chan*

 lfdattach(char *x)

 {