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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* Launch Java executables via exec(2).
*
* Java executables are platform-independent executable files
* based on the JAR file format. Executable JAR files contain a
* special 'extra field' header in the first file of the archive
* that marks the file as a true executable. The data in that field
* is used to pass additional run-time information to the Java VM.
*
* This handler looks for the appropriate magic number on the
* front of the file, checks that the JAR file is executable, then
* invokes the Java runtime environment to do the rest of the work.
*/
#include <sys/types.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/exec.h>
#include <sys/modctl.h>
#include <sys/cmn_err.h>
#include <sys/pathname.h>
/*
* These variables can be tweaked via /etc/system to allow prototyping
* and debugging. See PSARC/1997/123.
*
* Modified by PSARC/1999/012 to be Contract Private between Solaris and
* the Java Technology Group. It is expected that any future change to
* these variables be coordinated between the consolidations.
*/
#if defined(__sparc)
char *jexec = "/usr/java/jre/lib/sparc/jexec";
#elif defined(__i386) || defined(__i386_COMPAT)
char *jexec = "/usr/java/jre/lib/i386/jexec";
#else
#error "Unknown ISA"
#endif
char *jexec_arg = "-jar";
/*
* ZIP/JAR file header information
*/
#define SIGSIZ 4
#define LOCSIG "PK\003\004"
#define LOCHDRSIZ 30
#define CH(b, n) (((unsigned char *)(b))[n])
#define SH(b, n) (CH(b, n) | (CH(b, n+1) << 8))
#define LG(b, n) (SH(b, n) | (SH(b, n+2) << 16))
#define LOCNAM(b) (SH(b, 26)) /* filename size */
#define LOCEXT(b) (SH(b, 28)) /* extra field size */
#define XFHSIZ 4 /* header id, data size */
#define XFHID(b) (SH(b, 0)) /* extract field header id */
#define XFDATASIZ(b) (SH(b, 2)) /* extract field data size */
#define XFJAVASIG 0xcafe /* java executables */
/*ARGSUSED3*/
static int
javaexec(vnode_t *vp, struct execa *uap, struct uarg *args,
struct intpdata *idatap, int level, long *execsz, int setid,
caddr_t execfile, cred_t *cred)
{
struct intpdata idata;
int error;
ssize_t resid;
vnode_t *nvp;
off_t xoff, xoff_end;
char lochdr[LOCHDRSIZ];
struct pathname lookpn;
struct pathname resolvepn;
char *opath;
if (level)
return (ENOEXEC); /* no recursion */
/*
* Read in the full local file header, and validate
* the initial signature.
*/
if ((error = vn_rdwr(UIO_READ, vp, lochdr, sizeof (lochdr),
0, UIO_SYSSPACE, 0, (rlim64_t)0, cred, &resid)) != 0)
return (error);
if (resid != 0 || strncmp(lochdr, LOCSIG, SIGSIZ) != 0)
return (ENOEXEC);
/*
* Ok, so this -is- a ZIP file, and might even be a JAR file.
* Is it a Java executable?
*/
xoff = sizeof (lochdr) + LOCNAM(lochdr);
xoff_end = xoff + LOCEXT(lochdr);
while (xoff < xoff_end) {
char xfhdr[XFHSIZ];
if ((error = vn_rdwr(UIO_READ, vp, xfhdr, sizeof (xfhdr),
xoff, UIO_SYSSPACE, 0, (rlim64_t)0, cred, &resid)) != 0)
return (error);
if (resid != 0)
return (ENOEXEC);
if (XFHID(xfhdr) == XFJAVASIG)
break;
xoff += sizeof (xfhdr) + XFDATASIZ(xfhdr);
}
if (xoff >= xoff_end)
return (ENOEXEC);
/*
* Note: If we ever make setid execution work, we need to ensure
* that we use /dev/fd to avoid the classic setuid shell script
* security hole.
*/
if (setid)
return (EACCES);
/*
* Find and invoke the Java runtime environment on the file
*/
idata.intp = NULL;
idata.intp_name = jexec;
idata.intp_arg = jexec_arg;
if (error = pn_get(idata.intp_name, UIO_SYSSPACE, &lookpn))
return (error);
pn_alloc(&resolvepn);
if (error = lookuppn(&lookpn, &resolvepn, FOLLOW, NULLVPP, &nvp)) {
pn_free(&resolvepn);
pn_free(&lookpn);
return (ENOEXEC);
}
opath = args->pathname;
args->pathname = resolvepn.pn_path;
/* don't free resolvepn until we are done with args */
pn_free(&lookpn);
error = gexec(&nvp,
uap, args, &idata, level + 1, execsz, execfile, cred);
VN_RELE(nvp);
args->pathname = opath;
pn_free(&resolvepn);
return (error);
}
static struct execsw jexecsw = {
javamagicstr,
0,
4,
javaexec,
NULL
};
static struct modlexec jmodlexec = {
&mod_execops, "exec for Java", &jexecsw
};
static struct modlinkage jmodlinkage = {
MODREV_1, &jmodlexec, NULL
};
int
_init(void)
{
return (mod_install(&jmodlinkage));
}
int
_fini(void)
{
return (mod_remove(&jmodlinkage));
}
int
_info(struct modinfo *modinfop)
{
return (mod_info(&jmodlinkage, modinfop));
}
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