busybox/insmod.c

/* vi: set sw=4 ts=4: */
/*
 * Mini insmod implementation for busybox
 *
 * Copyright (C) 1999,2000 by Lineo, inc.
 * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */

#include "internal.h"
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/syscall.h>
#include <linux/module.h>

#define _PATH_MODULES	"/lib/modules"

#warning "Danger Will Robinson, Danger!!!"
#warning " "
#warning "insmod is still under construction.  Don't use it."
#warning " "
#warning "	You have been warned!"
#warning " "


/* Some firendly syscalls to cheer everyone's day...  */
_syscall2(int, init_module, const char *, name,
		  const struct module *, info)
#ifndef BB_RMMOD
_syscall1(int, delete_module, const char *, name)
#else
extern int delete_module(const char *);
#endif

#if defined(__i386__) || defined(__m68k__) || defined(__arm__)
/* Jump through hoops to fixup error return codes */
#define __NR__create_module  __NR_create_module
static inline _syscall2(long, _create_module, const char *, name, size_t,
						size)
unsigned long create_module(const char *name, size_t size)
{
	long ret = _create_module(name, size);

	if (ret == -1 && errno > 125) {
		ret = -errno;
		errno = 0;
	}
	return ret;
}
#else
_syscall2(unsigned long, create_module, const char *, name, size_t, size)
#endif
static char m_filename[PATH_MAX + 1] = "\0";
static char m_fullName[PATH_MAX + 1] = "\0";
static const char insmod_usage[] =
	"insmod [OPTION]... MODULE [symbol=value]...\n\n"
	"Loads the specified kernel modules into the kernel.\n\n"
	"Options:\n"

	"\t-f\tForce module to load into the wrong kernel version.\n"
	"\t-k\tMake module autoclean-able.\n";


static int findNamedModule(const char *fileName, struct stat *statbuf)
{
	if (m_fullName[0] == '\0')
		return (FALSE);
	else {
		char *tmp = strrchr(fileName, '/');

		if (tmp == NULL)
			tmp = (char *) fileName;
		else
			tmp++;
		if (check_wildcard_match(tmp, m_fullName) == TRUE) {
			/* Stop searching if we find a match */
			memcpy(m_filename, fileName, strlen(fileName));
			return (FALSE);
		}
	}
	return (TRUE);
}


extern int insmod_main(int argc, char **argv)
{
	int len;
	char *tmp;
	char m_name[PATH_MAX + 1] = "\0";
	FILE *fp;

	if (argc <= 1) {
		usage(insmod_usage);
	}

	/* Parse any options */
	while (--argc > 0 && **(++argv) == '-') {
		while (*(++(*argv))) {
			switch (**argv) {
			case 'f':
				break;
			case 'k':
				break;
			default:
				usage(insmod_usage);
			}
		}
	}

	if (argc <= 0)
		usage(insmod_usage);

	/* Grab the module name */
	if ((tmp = strrchr(*argv, '/')) != NULL)
		tmp++;
	else
		tmp = *argv;
	len = strlen(tmp);

	if (len > 2 && tmp[len - 2] == '.' && tmp[len - 1] == 'o')
		len -= 2;
	memcpy(m_name, tmp, len);
	strcpy(m_fullName, m_name);
	strcat(m_fullName, ".o");

	/* Get a filedesc for the module */
	if ((fp = fopen(*argv, "r")) == NULL) {
		/* Hmpf.  Could not open it. Search through _PATH_MODULES to find a module named m_name */
		if (recursiveAction(_PATH_MODULES, TRUE, FALSE, FALSE,
							findNamedModule, findNamedModule) == FALSE) {
			if (m_filename[0] == '\0'
				|| ((fp = fopen(m_filename, "r")) == NULL)) {
				perror("No module by that name found in " _PATH_MODULES
					   "\n");
				exit(FALSE);
			}
		}
	} else
		memcpy(m_filename, *argv, strlen(*argv));


	fprintf(stderr, "m_filename='%s'\n", m_filename);
	fprintf(stderr, "m_name='%s'\n", m_name);


	/* TODO: do something roughtly like this... */
#if 0

	if ((f = obj_load(fp)) == NULL) {
		perror("Could not load the module\n");
		exit(FALSE);
	}

	/* Let the module know about the kernel symbols.  */
	add_kernel_symbols(f);

	if (!create_this_module(f, m_name)) {
		perror("Could not create the module\n");
		exit(FALSE);
	}

	if (!obj_check_undefineds(f, quiet)) {
		perror("Undefined symbols in the module\n");
		exit(FALSE);
	}
	obj_allocate_commons(f);

	/* Perse the module's arguments */
	while (argc-- > 0 && *(argv++) != '\0') {
		if (!process_module_arguments(f, argc - optind, argv + optind)) {
			perror("Undefined symbols in the module\n");
			exit(FALSE);
		}
	}

	/* Find current size of the module */
	m_size = obj_load_size(f);


	errno = 0;
	m_addr = create_module(m_name, m_size);
	switch (errno) {
		/* yada yada */
	default:
		perror("create_module: %m");

	}

#endif

	fclose(fp);
	exit(TRUE);
}