binfmt_java.c /* * 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> #include <paths.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_BSHELL) * (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