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devopen.c revision 1.5 
      1 /*	$NetBSD: devopen.c,v 1.5 2003/11/12 18:44:08 drochner 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 #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 	bcopy(pxeboot_fstab[0].fst_ops, file_system, 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 				bcopy(pxeboot_fstab[i].fst_ops, file_system,
    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 }
    147