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
55struct 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 */
71int
72devopen(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}
147