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devopen.c revision 1.2 
      1 /*	$NetBSD: devopen.c,v 1.2 2002/02/17 20:14:08 thorpej 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 <stand.h>
     40 
     41 #include <libi386.h>
     42 #ifdef _STANDALONE
     43 #include <lib/libkern/libkern.h>
     44 #include <bootinfo.h>
     45 #else
     46 #include <string.h>
     47 #endif
     48 
     49 #include "pxeboot.h"
     50 
     51 #ifdef _STANDALONE
     52 struct btinfo_bootpath bibp;
     53 extern char bootfile[];
     54 #endif
     55 
     56 /*
     57  * Open the "device" named by the combined file system/file name
     58  * given as the fname arg.  Format is:
     59  *
     60  *	nfs:netbsd
     61  *	tftp:netbsd
     62  *	netbsd
     63  *
     64  * If no file system is specified, we default to the first in the
     65  * file system table (which ought to be NFS).
     66  *
     67  * We always open just one device (the PXE netif).
     68  */
     69 int
     70 devopen(struct open_file *f, const char *fname, char **file)
     71 {
     72 	struct devsw *dp;
     73 	char *filename;
     74 	size_t fsnamelen;
     75 	int i, error;
     76 
     77 	dp = &devsw[0];
     78 
     79 	/* Set the default boot file system. */
     80 	bcopy(pxeboot_fstab[0].fst_ops, file_system, sizeof(struct fs_ops));
     81 
     82 	/* Open the device; this might give us a boot file name. */
     83 	error = (*dp->dv_open)(f, NULL);
     84 	if (error)
     85 		return (error);
     86 
     87 	f->f_dev = dp;
     88 
     89 	/* If the DHCP server provided a file name, use it. */
     90 	if (bootfile[0] != '\0')
     91 		fname = bootfile;
     92 
     93 	filename = strchr(fname, ':');
     94 	if (filename != NULL) {
     95 		fsnamelen = (size_t)((const char *)filename - fname);
     96 		for (i = 0; i < npxeboot_fstab; i++) {
     97 			if (strncmp(fname, pxeboot_fstab[i].fst_name,
     98 			    fsnamelen) == 0) {
     99 				bcopy(pxeboot_fstab[i].fst_ops, file_system,
    100 				    sizeof(struct fs_ops));
    101 				break;
    102 			}
    103 		}
    104 		if (i == npxeboot_fstab) {
    105 			printf("Invalid file system type specified in %s\n",
    106 			    fname);
    107 			error = EINVAL;
    108 			goto bad;
    109 		}
    110 		filename++;
    111 		if (filename[0] == '\0') {
    112 			printf("No file specified in %s\n", fname);
    113 			error = EINVAL;
    114 			goto bad;
    115 		}
    116 	} else
    117 		filename = (char *)fname;
    118 
    119 	*file = filename;
    120 
    121 #ifdef _STANDALONE
    122 	strncpy(bibp.bootpath, filename, sizeof(bibp.bootpath));
    123 	BI_ADD(&bibp, BTINFO_BOOTPATH, sizeof(bibp));
    124 #endif
    125 
    126 	return (0);
    127  bad:
    128 	(*dp->dv_close)(f);
    129 	f->f_dev = NULL;
    130 	return (error);
    131 }
    132