xref: /netbsd-src/sys/arch/i386/stand/pxeboot/devopen.c (revision 62cf489d8e50741c34bd70b1b71691c2aceec801)
1 /*	$NetBSD: devopen.c,v 1.9 2009/10/26 19:16:56 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
devopen(struct open_file * f,const char * fname,char ** file)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 }
147