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/*
* linux/fs/binfmt_java.c
*
* Copyright (C) 1996 Brian A. Lantz
* derived from binfmt_script.c
*
* Simplified and modified to support binary java interpreters
* by Tom May <ftom@netcom.com>.
*/
#include <linux/module.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/malloc.h>
#include <linux/binfmts.h>
#include <linux/init.h>
#define _PATH_JAVA "/usr/bin/java"
#define _PATH_APPLET "/usr/bin/appletviewer"
/* These paths can be modified with sysctl(). */
char binfmt_java_interpreter[65] = _PATH_JAVA;
char binfmt_java_appletviewer[65] = _PATH_APPLET;
static int do_load_java(struct linux_binprm *bprm,struct pt_regs *regs)
{
char *i_name;
int len;
int retval;
struct dentry * dentry;
unsigned char *ucp = (unsigned char *) bprm->buf;
if ((ucp[0] != 0xca) || (ucp[1] != 0xfe) || (ucp[2] != 0xba) || (ucp[3] != 0xbe))
return -ENOEXEC;
/*
* Fail if we're called recursively, e.g., the Java interpreter
* is a java binary.
*/
if (bprm->java)
return -ENOEXEC;
bprm->java = 1;
dput(bprm->dentry);
bprm->dentry = NULL;
/*
* Set args: [0] the name of the java interpreter
* [1] name of java class to execute, which is the
* filename without the path and without trailing
* ".class". Note that the interpreter will use
* its own way to found the class file (typically using
* environment variable CLASSPATH), and may in fact
* execute a different file from the one we want.
*
* This is done in reverse order, because of how the
* user environment and arguments are stored.
*/
remove_arg_zero(bprm);
len = strlen (bprm->filename);
if (len >= 6 && !strcmp (bprm->filename + len - 6, ".class"))
bprm->filename[len - 6] = 0;
if ((i_name = strrchr (bprm->filename, '/')) != NULL)
i_name++;
else
i_name = bprm->filename;
bprm->p = copy_strings(1, &i_name, bprm->page, bprm->p, 2);
bprm->argc++;
i_name = binfmt_java_interpreter;
bprm->p = copy_strings(1, &i_name, bprm->page, bprm->p, 2);
bprm->argc++;
if (!bprm->p)
return -E2BIG;
/*
* OK, now restart the process with the interpreter's dentry.
*/
bprm->filename = binfmt_java_interpreter;
dentry = open_namei(binfmt_java_interpreter, 0, 0);
retval = PTR_ERR(dentry);
if (IS_ERR(dentry))
return retval;
bprm->dentry = dentry;
retval = prepare_binprm(bprm);
if (retval < 0)
return retval;
return search_binary_handler(bprm,regs);
}
static int do_load_applet(struct linux_binprm *bprm,struct pt_regs *regs)
{
char *i_name;
struct dentry * dentry;
int retval;
if (strncmp (bprm->buf, "<!--applet", 10))
return -ENOEXEC;
dput(bprm->dentry);
bprm->dentry = NULL;
/*
* Set args: [0] the name of the appletviewer
* [1] filename of html file
*
* This is done in reverse order, because of how the
* user environment and arguments are stored.
*/
remove_arg_zero(bprm);
i_name = bprm->filename;
bprm->p = copy_strings(1, &i_name, bprm->page, bprm->p, 2);
bprm->argc++;
i_name = binfmt_java_appletviewer;
bprm->p = copy_strings(1, &i_name, bprm->page, bprm->p, 2);
bprm->argc++;
if (!bprm->p)
return -E2BIG;
/*
* OK, now restart the process with the interpreter's dentry.
*/
bprm->filename = binfmt_java_appletviewer;
dentry = open_namei(binfmt_java_appletviewer, 0, 0);
retval = PTR_ERR(dentry);
if (IS_ERR(dentry))
return retval;
bprm->dentry = dentry;
retval = prepare_binprm(bprm);
if (retval < 0)
return retval;
return search_binary_handler(bprm,regs);
}
static int load_java(struct linux_binprm *bprm,struct pt_regs *regs)
{
int retval;
MOD_INC_USE_COUNT;
retval = do_load_java(bprm,regs);
MOD_DEC_USE_COUNT;
return retval;
}
static struct linux_binfmt java_format = {
#ifndef MODULE
NULL, 0, load_java, NULL, NULL
#else
NULL, &__this_module, load_java, NULL, NULL
#endif
};
static int load_applet(struct linux_binprm *bprm,struct pt_regs *regs)
{
int retval;
MOD_INC_USE_COUNT;
retval = do_load_applet(bprm,regs);
MOD_DEC_USE_COUNT;
return retval;
}
static struct linux_binfmt applet_format = {
#ifndef MODULE
NULL, 0, load_applet, NULL, NULL
#else
NULL, &__this_module, load_applet, NULL, NULL
#endif
};
__initfunc(int init_java_binfmt(void))
{
register_binfmt(&java_format);
return register_binfmt(&applet_format);
}
#ifdef MODULE
int init_module(void)
{
return init_java_binfmt();
}
void cleanup_module( void) {
unregister_binfmt(&java_format);
unregister_binfmt(&applet_format);
}
#endif
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