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