/*      $NetBSD: devopen.c,v 1.9 2009/10/26 19:16:56 cegger Exp $       */

/*
 * Copyright 2001, 2002 Wasabi Systems, Inc.
 * All rights reserved.
 *
 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed for the NetBSD Project by
 *      Wasabi Systems, Inc.
 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/param.h>
#include <lib/libsa/stand.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <net.h>

#include <libi386.h>
#ifdef _STANDALONE
#include <lib/libkern/libkern.h>
#include <bootinfo.h>
#else
#include <string.h>
#endif

#include "pxeboot.h"

#ifdef _STANDALONE
struct btinfo_bootpath bibp;
#endif

/*
 * Open the "device" named by the combined file system/file name
 * given as the fname arg.  Format is:
 *
 *      nfs:netbsd
 *      tftp:netbsd
 *      netbsd
 *
 * If no file system is specified, we default to the first in the
 * file system table (which ought to be NFS).
 *
 * We always open just one device (the PXE netif).
 */
int
devopen(struct open_file *f, const char *fname, char **file)
{
        struct devsw *dp;
        char *filename;
        size_t fsnamelen;
        int i, error;

        dp = &devsw[0];

        /* Set the default boot file system. */
        memcpy(file_system, pxeboot_fstab[0].fst_ops, sizeof(struct fs_ops));

        /* if we got passed a filename, pass it to the BOOTP server */
        if (fname)
                strncpy(bootfile, fname, FNAME_SIZE);

        /* Open the device; this might give us a boot file name. */
        error = (*dp->dv_open)(f, NULL);
        if (error)
                return (error);

        f->f_dev = dp;

        /*
         * If the DHCP server provided a file name:
         * - If it contains a ":", assume it points to a NetBSD kernel.
         * - If not, assume that the DHCP server was not able to pass
         *   a separate filename for the kernel. (The name probably
         *   was the same as used to load "pxeboot".) Ignore it and
         *   use the default in this case.
         * So we cater to simple DHCP servers while being able to
         * use the power of conditional behaviour in modern ones.
         */
        if (strchr(bootfile, ':'))
                fname = bootfile;

        filename = (fname ? strchr(fname, ':') : NULL);
        if (filename != NULL) {
                fsnamelen = (size_t)((const char *)filename - fname);
                for (i = 0; i < npxeboot_fstab; i++) {
                        if (strncmp(fname, pxeboot_fstab[i].fst_name,
                            fsnamelen) == 0) {
                                memcpy(file_system, pxeboot_fstab[i].fst_ops,
                                    sizeof(struct fs_ops));
                                break;
                        }
                }
                if (i == npxeboot_fstab) {
                        printf("Invalid file system type specified in %s\n",
                            fname);
                        error = EINVAL;
                        goto bad;
                }
                filename++;
                if (filename[0] == '\0') {
                        printf("No file specified in %s\n", fname);
                        error = EINVAL;
                        goto bad;
                }
        } else
                filename = (char *)fname;

        *file = filename;

#ifdef _STANDALONE
        strncpy(bibp.bootpath, filename, sizeof(bibp.bootpath));
        BI_ADD(&bibp, BTINFO_BOOTPATH, sizeof(bibp));
#endif

        return (0);
 bad:
        (*dp->dv_close)(f);
        f->f_dev = NULL;
        return (error);
}