sys/arch/i386/stand/pxeboot/devopen.c

   1 /*      $NetBSD: devopen.c,v 1.8 2009/03/18 17:06:44 cegger Exp $       */
   2
   3 /*
   4  * Copyright 2001, 2002 Wasabi Systems, Inc.
   5  * All rights reserved.
   6  *
   7  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed for the NetBSD Project by
  20  *      Wasabi Systems, Inc.
  21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
  22  *    or promote products derived from this software without specific prior
  23  *    written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
  29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  35  * POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <sys/param.h>
  39 #include <lib/libsa/stand.h>
  40 #include <netinet/in.h>
  41 #include <netinet/in_systm.h>
  42 #include <net.h>
  43
  44 #include <libi386.h>
  45 #ifdef _STANDALONE
  46 #include <lib/libkern/libkern.h>
  47 #include <bootinfo.h>
  48 #else
  49 #include <string.h>
  50 #endif
  51
  52 #include "pxeboot.h"
  53
  54 #ifdef _STANDALONE
  55 struct btinfo_bootpath bibp;
  56 #endif
  57
  58 /*
  59  * Open the "device" named by the combined file system/file name
  60  * given as the fname arg.  Format is:
  61  *
  62  *      nfs:netbsd
  63  *      tftp:netbsd
  64  *      netbsd
  65  *
  66  * If no file system is specified, we default to the first in the
  67  * file system table (which ought to be NFS).
  68  *
  69  * We always open just one device (the PXE netif).
  70  */
  71 int
  72 devopen(struct open_file *f, const char *fname, char **file)
  73 {
  74         struct devsw *dp;
  75         char *filename;
  76         size_t fsnamelen;
  77         int i, error;
  78
  79         dp = &devsw[0];
  80
  81         /* Set the default boot file system. */
  82         memcpy(file_system, pxeboot_fstab[0].fst_ops, sizeof(struct fs_ops));
  83
  84         /* if we got passed a filename, pass it to the BOOTP server */
  85         if (fname)
  86                 strncpy(bootfile, fname, FNAME_SIZE);
  87
  88         /* Open the device; this might give us a boot file name. */
  89         error = (*dp->dv_open)(f, NULL);
  90         if (error)
  91                 return (error);
  92
  93         f->f_dev = dp;
  94
  95         /*
  96          * If the DHCP server provided a file name:
  97          * - If it contains a ":", assume it points to a NetBSD kernel.
  98          * - If not, assume that the DHCP server was not able to pass
  99          *   a separate filename for the kernel. (The name probably
 100          *   was the same as used to load "pxeboot".) Ignore it and
 101          *   use the default in this case.
 102          * So we cater to simple DHCP servers while being able to
 103          * use the power of conditional behaviour in modern ones.
 104          */
 105         if (strchr(bootfile, ':'))
 106                 fname = bootfile;
 107
 108         filename = (fname ? strchr(fname, ':') : NULL);
 109         if (filename != NULL) {
 110                 fsnamelen = (size_t)((const char *)filename - fname);
 111                 for (i = 0; i < npxeboot_fstab; i++) {
 112                         if (strncmp(fname, pxeboot_fstab[i].fst_name,
 113                             fsnamelen) == 0) {
 114                                 memcpy(file_system, pxeboot_fstab[i].fst_ops,
 115                                     sizeof(struct fs_ops));
 116                                 break;
 117                         }
 118                 }
 119                 if (i == npxeboot_fstab) {
 120                         printf("Invalid file system type specified in %s\n",
 121                             fname);
 122                         error = EINVAL;
 123                         goto bad;
 124                 }
 125                 filename++;
 126                 if (filename[0] == '\0') {
 127                         printf("No file specified in %s\n", fname);
 128                         error = EINVAL;
 129                         goto bad;
 130                 }
 131         } else
 132                 filename = (char *)fname;
 133
 134         *file = filename;
 135
 136 #ifdef _STANDALONE
 137         strncpy(bibp.bootpath, filename, sizeof(bibp.bootpath));
 138         BI_ADD(&bibp, BTINFO_BOOTPATH, sizeof(bibp));
 139 #endif
 140
 141         return (0);
 142  bad:
 143         (*dp->dv_close)(f);
 144         f->f_dev = NULL;
 145         return (error);
 146 }