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/*

 *  linux/fs/binfmt_java.c

 *

 *  Copyright (C) 1996  Brian A. Lantz

 *  derived from binfmt_script.c

 */

#include <linux/module.h>

#include <linux/string.h>

#include <linux/stat.h>

#include <linux/malloc.h>

#include <linux/binfmts.h>

#define _PATH_JAVA      "/usr/bin/java"

#define _PATH_APPLET    "/usr/bin/appletviewer"

#define _PATH_SH        "/bin/bash"

char binfmt_java_interpreter[65] = _PATH_JAVA;

char binfmt_java_appletviewer[65] = _PATH_APPLET;

static int do_load_script(struct linux_binprm *bprm,struct pt_regs *regs)

{

        char *cp, *interp, *i_name;

        int retval;

        unsigned char *ucp = (unsigned char *) bprm->buf;

        if ((ucp[0] != 0xca) || (ucp[1] != 0xfe) || (ucp[2] != 0xba) || (ucp[3] != 0xbe))

                return -ENOEXEC;

        iput(bprm->inode);

        bprm->dont_iput=1;

        /*

         * OK, we've set the interpreter name

         * Splice in (1) the interpreter's name for argv[0] (_PATH_SH)

         *           (2) the name of the java wrapper for argv[1] (_PATH_JAVA)

         *           (3) filename of Java class (replace argv[0])

         *               without leading path or trailing '.class'

         *

         * This is done in reverse order, because of how the

         * user environment and arguments are stored.

         */

        remove_arg_zero(bprm);

        if ((cp = strstr (bprm->filename, ".class")) != NULL)

                *cp = 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++;

        strcpy (bprm->buf, binfmt_java_interpreter);

        cp = bprm->buf;

        bprm->p = copy_strings(1, &cp, bprm->page, bprm->p, 2);

        bprm->argc++;

        strcpy (bprm->buf, _PATH_SH);

        interp = bprm->buf;

        if ((i_name = strrchr (bprm->buf, '/')) != NULL)

                i_name++;

        else

                i_name = bprm->buf;

        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 inode.

         * Note that we use open_namei() as the name is now in kernel

         * space, and we don't need to copy it.

         */

        retval = open_namei(interp, 0, 0, &bprm->inode, NULL);

        if (retval)

                return retval;

        bprm->dont_iput=0;

        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 *cp, *interp, *i_name;

        int retval;

        if (strncmp (bprm->buf, "<!--applet", 10))

                return -ENOEXEC;

        iput(bprm->inode);

        bprm->dont_iput=1;

        /*

         * OK, we've set the interpreter name

         * Splice in (1) the interpreter's name for argv[0] (_PATH_SH)

         *           (2) the name of the appletviewer wrapper for argv[1] (_PATH_APPLET)

         *           (3) filename of html file (replace argv[0])

         *

         * 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++;

        strcpy (bprm->buf, binfmt_java_appletviewer);

        cp = bprm->buf;

        bprm->p = copy_strings(1, &cp, bprm->page, bprm->p, 2);

        bprm->argc++;

        strcpy (bprm->buf, _PATH_SH);

        interp = bprm->buf;

        if ((i_name = strrchr (bprm->buf, '/')) != NULL)

                i_name++;

        else

                i_name = bprm->buf;

        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 inode.

         * Note that we use open_namei() as the name is now in kernel

         * space, and we don't need to copy it.

         */

        retval = open_namei(interp, 0, 0, &bprm->inode, NULL);

        if (retval)

                return retval;

        bprm->dont_iput=0;

        retval=prepare_binprm(bprm);

        if(retval<0)

                return retval;

        return search_binary_handler(bprm,regs);

}

static int load_script(struct linux_binprm *bprm,struct pt_regs *regs)

{

        int retval;

        MOD_INC_USE_COUNT;

        retval = do_load_script(bprm,regs);

        MOD_DEC_USE_COUNT;

        return retval;

}

struct linux_binfmt java_format = {

#ifndef MODULE

        NULL, 0, load_script, NULL, NULL

#else

        NULL, &mod_use_count_, load_script, 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;

}

struct linux_binfmt applet_format = {

#ifndef MODULE

        NULL, 0, load_applet, NULL, NULL

#else

        NULL, &mod_use_count_, load_applet, NULL, NULL

#endif

};

int init_java_binfmt(void) {

        printk(KERN_INFO "JAVA Binary support v1.01 for Linux 1.3.98 (C)1996 Brian A. Lantz\n");

        register_binfmt(&java_format);

        return register_binfmt(&applet_format);

}

#ifdef MODULE

int init_module(void)

{

        return init_java_binfmt();

}

void cleanup_module( void) {

        printk(KERN_INFO "Removing JAVA Binary support...\n");

        unregister_binfmt(&java_format);

        unregister_binfmt(&applet_format);

}

#endif