From NetBSD:

Add remote tape capabilities.
Since we're setuid, let's be paranoid.
Picked up a little lint in the dryer.

3 files changed, 54 insertions, 12 deletions

diff --git a/bin/mt/Makefile b/bin/mt/Makefile
index 303b40e9f60..bcab624163c 100644
--- a/bin/mt/Makefile
+++ b/bin/mt/Makefile
@@ -1,6 +1,9 @@
-#	$NetBSD: Makefile,v 1.3 1995/03/21 06:57:43 cgd Exp $
+#	$NetBSD: Makefile,v 1.5 1996/03/06 06:22:04 scottr Exp $
 #	@(#)Makefile	8.1 (Berkeley) 6/6/93
 
 PROG=	mt
+SRCS=	mt.c mtrmt.c
+BINOWN=	root
+BINMODE=4555
 
 .include <bsd.prog.mk>
diff --git a/bin/mt/mt.1 b/bin/mt/mt.1
index e134616b776..0f23ed44d04 100644
--- a/bin/mt/mt.1
+++ b/bin/mt/mt.1
@@ -1,4 +1,4 @@
-.\"	$NetBSD: mt.1,v 1.6 1995/08/22 19:36:00 jtc Exp $
+.\"	$NetBSD: mt.1,v 1.7 1996/03/05 20:39:42 scottr Exp $
 .\"
 .\" Copyright (c) 1981, 1990, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -56,6 +56,15 @@ Note
 that
 .Ar tapename
 must reference a raw (not block) tape device.
+If
+.Ar tapename
+is of the form
+.Dq host:tapename ,
+or
+.Dq user@host:tapename ,
+.Nm mt
+writes to the named tape device on the remote host using
+.Xr rmt 8 .
 .Pp
 The available commands are listed below.  Only as many
 characters as are required to uniquely identify a command
diff --git a/bin/mt/mt.c b/bin/mt/mt.c
index aa82d1a3546..7db658ac81e 100644
--- a/bin/mt/mt.c
+++ b/bin/mt/mt.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: mt.c,v 1.8 1995/09/28 07:18:20 tls Exp $	*/
+/*	$NetBSD: mt.c,v 1.11 1996/03/06 06:34:20 scottr Exp $	*/
 
 /*
  * Copyright (c) 1980, 1993
@@ -43,7 +43,7 @@ static char copyright[] =
 #if 0
 static char sccsid[] = "@(#)mt.c	8.2 (Berkeley) 6/6/93";
 #else
-static char rcsid[] = "$NetBSD: mt.c,v 1.8 1995/09/28 07:18:20 tls Exp $";
+static char rcsid[] = "$NetBSD: mt.c,v 1.11 1996/03/06 06:34:20 scottr Exp $";
 #endif
 #endif /* not lint */
 
@@ -60,6 +60,9 @@ static char rcsid[] = "$NetBSD: mt.c,v 1.8 1995/09/28 07:18:20 tls Exp $";
 #include <stdio.h>
 #include <ctype.h>
 #include <string.h>
+#include <unistd.h>
+
+#include "mt.h"
 
 struct commands {
 	char *c_name;
@@ -86,6 +89,10 @@ void printreg __P((char *, u_int, char *));
 void status __P((struct mtget *));
 void usage __P((void));
 
+char	*host = NULL;	/* remote host (if any) */
+uid_t	uid;		/* read uid */
+uid_t	euid;		/* effective uid */
+
 int
 main(argc, argv)
 	int argc;
@@ -97,6 +104,10 @@ main(argc, argv)
 	int ch, len, mtfd;
 	char *p, *tape;
 
+	uid = getuid();
+	euid = geteuid();
+	(void) seteuid(uid);
+
 	if ((tape = getenv("TAPE")) == NULL)
 		tape = DEFTAPE;
 
@@ -116,6 +127,15 @@ main(argc, argv)
 	if (argc < 1 || argc > 2)
 		usage();
 
+	if (strchr(tape, ':')) {
+		host = tape;
+		tape = strchr(host, ':');
+		*tape++ = '\0';
+		if (rmthost(host) == 0)
+			exit(X_ABORT);
+	}
+	(void) setuid(uid); /* rmthost() is the only reason to be setuid */
+
 	len = strlen(p = *argv++);
 	for (comp = com;; comp++) {
 		if (comp->c_name == NULL)
@@ -123,7 +143,8 @@ main(argc, argv)
 		if (strncmp(p, comp->c_name, len) == 0)
 			break;
 	}
-	if ((mtfd = open(tape, comp->c_ronly ? O_RDONLY : O_RDWR)) < 0)
+	if ((mtfd = host ? rmtopen(tape, 2) :
+	    open(tape, O_WRONLY|O_CREAT, 0666)) < 0)
 		err(2, "%s", tape);
 	if (comp->c_code != MTNOP) {
 		mt_com.mt_op = comp->c_code;
@@ -134,14 +155,23 @@ main(argc, argv)
 		}
 		else
 			mt_com.mt_count = 1;
-		if (ioctl(mtfd, MTIOCTOP, &mt_com) < 0)
+		if ((host ? rmtioctl(mt_com.mt_op, mt_com.mt_count) :
+		    ioctl(mtfd, MTIOCTOP, &mt_com)) < 0)
 			err(2, "%s: %s", tape, comp->c_name);
 	} else {
-		if (ioctl(mtfd, MTIOCGET, &mt_status) < 0)
-			err(2, "ioctl MTIOCGET");
-		status(&mt_status);
+		if (host) {
+			status(rmtstatus());
+		} else {
+			if (ioctl(mtfd, MTIOCGET, &mt_status) < 0)
+				err(2, "ioctl MTIOCGET");
+			status(&mt_status);
+		}
 	}
-	exit (0);
+
+	if (host)
+		rmtclose();
+
+	exit(X_FINOK);
 	/* NOTREACHED */
 }
 
@@ -213,7 +243,7 @@ printreg(s, v, bits)
 	bits++;
 	if (v && bits) {
 		putchar('<');
-		while (i = *bits++) {
+		while ((i = *bits++)) {
 			if (v & (1 << (i-1))) {
 				if (any)
 					putchar(',');
@@ -232,5 +262,5 @@ void
 usage()
 {
 	(void)fprintf(stderr, "usage: mt [-f device] command [ count ]\n");
-	exit(1);
+	exit(X_USAGE);
 }