xref: /titanic_41/usr/src/lib/libgrubmgmt/common/libgrub_impl.h (revision ab15e531679da9ab75e52c1c16011e74e3664a23)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 /*
22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
23  * Use is subject to license terms.
24  */
25 /*
26  * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
27  */
28 
29 #ifndef	_GRBMIMPL_H
30 #define	_GRBMIMPL_H
31 
32 #ifdef	__cplusplus
33 extern "C" {
34 #endif
35 
36 #include <sys/types.h>
37 #include <sys/param.h>
38 #include <sys/mntent.h>
39 #include <sys/uadmin.h>
40 #include <sys/dktp/fdisk.h>
41 #include <libzfs.h>
42 #include <libdevinfo.h>
43 #include "libgrubmgmt.h"
44 #include "libgrub_errno.h"
45 
46 /*
47  * Macros for processing the GRUB menu.
48  */
49 #define	GRUB_MENU	"/boot/grub/menu.lst"
50 #define	BOOTSIGN_DIR	"/boot/grub/bootsign"
51 #define	BOOTSIGN_LEN	(2 * MAXNAMELEN)
52 #define	ZFS_BOOT_VAR	"$ZFS-BOOTFS"	/* ZFS boot option */
53 #define	ISADIR_VAR	"$ISADIR"	/* ISADIR option */
54 
55 #define	PRTNUM_INVALID	-1	/* Partition number invlaid */
56 #define	SLCNUM_INVALID	-1	/* Slice number invalid */
57 
58 #define	SLCNUM_FIRST		'a'
59 #define	SLCNUM_WHOLE_DISK	'q'
60 
61 #define	IS_SLCNUM_VALID(x)	((x) >= SLCNUM_FIRST && (x) < SLCNUM_WHOLE_DISK)
62 #define	IS_PRTNUM_VALID(x)	((uint_t)(x) < FD_NUMPART + MAX_EXT_PARTS)
63 
64 #define	GRBM_VALID_FLAG		((uint_t)1 << 31)
65 #define	GRBM_MAXLINE		8192
66 #define	IS_ENTRY_VALID(ent)	((ent) && ((ent)->ge_flags & GRBM_VALID_FLAG))
67 #define	IS_BARG_VALID(barg)	((barg)->gb_flags & GRBM_VALID_FLAG)
68 #define	IS_ENTRY_BARG_VALID(ent) \
69 	(IS_ENTRY_VALID(ent) && IS_BARG_VALID(&(ent)->ge_barg))
70 #define	IS_LINE2BIG(buf, bfsz, len) \
71 	((len = strlen(buf)) == (bfsz) - 1 && (buf)[len - 1] != '\n')
72 #define	IS_STR_NULL(x)	((x) == NULL ? "NULL" : (x))
73 #define	GRUB_ENTRY_IS_XVM(fbarg) \
74 	(strstr(fbarg.gba_kernel, "xen.gz") != NULL)
75 
76 enum {
77 #define	menu_cmd(cmd, num, flags, parsef)	num,
78 #define	menu_cmd_end(num)			num
79 #include "libgrub_cmd.def"
80 };
81 
82 typedef struct _grub_fs {
83 	di_node_t		gf_diroot;
84 	di_devlink_handle_t	gf_dvlh;
85 	libzfs_handle_t		*gf_lzfh;
86 } grub_fs_t;
87 
88 
89 typedef struct _grub_cmd_desc {
90 	const char	*gcd_cmd;
91 	uint_t		gcd_num;
92 	int		gcd_flags;
93 } grub_cmd_desc_t;
94 
95 
96 enum {
97 	GRBM_UFS = 0,
98 	GRBM_ZFS_TOPFS = 0,
99 	GRBM_FS_TOP = 0,
100 	GRBM_ZFS_BOOTFS,
101 	GRBM_FS_MAX
102 };
103 
104 typedef struct _grub_root {
105 	char		gr_fstyp[MNTMAXSTR];
106 	char		gr_physpath[MAXPATHLEN];
107 	grub_fsdesc_t	gr_fs[GRBM_FS_MAX];
108 } grub_root_t;
109 
110 /*
111  * Data struct for the boot argument constructed from a GRUB menu entry
112  */
113 typedef struct _grub_barg {
114 	grub_entry_t	*gb_entry;
115 	grub_line_t	*gb_errline;
116 	int		gb_walkret;	/* set to 0 when match found */
117 	uint_t		gb_flags;
118 	uint_t		gb_prtnum;
119 	uint_t		gb_slcnum;
120 	grub_root_t	gb_root;
121 	char		gb_bootsign[BOOTSIGN_LEN];
122 	char		gb_kernel[BOOTARGS_MAX];
123 	char		gb_module[BOOTARGS_MAX];
124 } grub_barg_t;
125 
126 
127 /* GRUB menu per-line classification */
128 enum {
129 	GRUB_LINE_INVALID = 0,
130 	GRUB_LINE_EMPTY,
131 	GRUB_LINE_COMMENT,
132 	GRUB_LINE_GLOBAL,
133 	GRUB_LINE_ENTRY,
134 	GRUB_LINE_TITLE
135 };
136 
137 /*
138  * Data structures for menu.lst contents
139  */
140 struct grub_line {
141 	grub_line_t	*gl_next;
142 	grub_line_t	*gl_prev;
143 	int		gl_line_num;	/* Line number in menu.lst */
144 	int		gl_entry_num;	/* menu boot entry #. */
145 					/* GRUB_ENTRY_DEFAULT if none */
146 	int		gl_flags;
147 	uint_t		gl_cmdtp;	/* recognized command type */
148 	char		*gl_cmd;
149 	char		*gl_sep;
150 	char		*gl_arg;
151 	char		*gl_line;
152 };
153 
154 struct grub_entry {
155 	grub_menu_t	*ge_menu;	/* grub_menu_t it belongs to */
156 	grub_entry_t	*ge_next;
157 	grub_entry_t	*ge_prev;
158 	grub_line_t	*ge_start;
159 	grub_line_t	*ge_end;
160 	int		ge_entry_num;
161 	uint_t		ge_flags;
162 	uint_t		ge_emask;	/* invalid lines mask */
163 	grub_barg_t	ge_barg;
164 };
165 
166 struct grub_menu {
167 	grub_line_t	*gm_start;
168 	grub_line_t	*gm_end;
169 	grub_line_t	*gm_curdefault;	/* line containing default */
170 	grub_entry_t	*gm_ent_start;	/* os entries */
171 	grub_entry_t	*gm_ent_end;
172 	grub_entry_t	*gm_ent_default;	/* default entry */
173 	uint_t		gm_line_num;	/* number of lines processed */
174 	uint_t		gm_entry_num;	/* number of entries processed */
175 	char		gm_path[MAXPATHLEN];
176 	grub_fs_t	gm_fs;
177 	grub_root_t	gm_root;
178 };
179 
180 /* File system helper functions */
181 int grub_current_root(grub_fs_t *, grub_root_t *);
182 grub_fsdesc_t *grub_get_rootfsd(const grub_root_t *);
183 int grub_fsd_mount_tmp(grub_fsdesc_t *, const char *);
184 void grub_fsd_umount_tmp(grub_fsdesc_t *);
185 int grub_fsd_get_mountp(grub_fsdesc_t *fsd, char *fstyp);
186 int grub_find_bootsign(grub_barg_t *barg);
187 
188 
189 /* GRUB menu parse functions */
190 int skip_line(const grub_line_t *lp, grub_barg_t *barg);
191 int error_line(const grub_line_t *lp, grub_barg_t *barg);
192 int kernel(const grub_line_t *lp, grub_barg_t *barg);
193 int module(const grub_line_t *lp, grub_barg_t *barg);
194 int dollar_kernel(const grub_line_t *lp, grub_barg_t *barg);
195 int dollar_module(const grub_line_t *lp, grub_barg_t *barg);
196 int findroot(const grub_line_t *lp, grub_barg_t *barg);
197 int bootfs(const grub_line_t *lp, grub_barg_t *barg);
198 size_t clean_path(char *path);
199 
200 
201 /* GRUB entry functions */
202 int grub_entry_construct_barg(grub_entry_t *ent);
203 const char *grub_entry_get_fstyp(const grub_entry_t *ent);
204 const char *grub_entry_get_kernel(const grub_entry_t *ent);
205 const char *grub_entry_get_module(const grub_entry_t *ent);
206 const grub_fsdesc_t *grub_entry_get_rootfs(const grub_entry_t *ent);
207 size_t grub_entry_get_cmdline(grub_entry_t *ent, char *cmdline, size_t size);
208 
209 /*
210  * GRUB menu parse/access funcions.
211  *
212  * Callers must call grub_menu_init() to to obtain a handle to the menu before
213  * calling any of the other functions, and call grub_menu_fini() to close.
214  *
215  * grub_menu_init:
216  *	Reads and parses GRUB menu file into a grub_menu_t data structure.
217  *	If grub_menu_path file path is NULL, will use 'currently active'
218  *	GRUB menu file.
219  * grub_menu_fini:
220  *	Frees all resources allocated by grub_menu_init().
221  *
222  * grub_menu_get_entry:
223  *	Returns a particular entry from the menu.
224  * grub_menu_next_entry:
225  * grub_menu_prev_entry:
226  *      Returns next or previous entry in the menu.
227  *      If current entry is NULL, return first or last entry.
228  *
229  * grub_menu_next_line:
230  * grub_menu_prev_line:
231  *      Returns next/prev (to the current) line in the menu.
232  *      If current line is NULL, returns first or last line.
233  * grub_menu_get_line:
234  *      Returns the specified line in the menu (line counter starts from one).
235  */
236 int grub_menu_init(const char *grub_menu_path, grub_menu_t **menup);
237 void grub_menu_fini(grub_menu_t *);
238 grub_entry_t *grub_menu_get_entry(const grub_menu_t *menu, int num);
239 grub_entry_t *grub_menu_next_entry(const grub_menu_t *menu,
240     const grub_entry_t *current);
241 grub_entry_t *grub_menu_prev_entry(const grub_menu_t *menu,
242     const grub_entry_t *current);
243 grub_line_t *grub_menu_next_line(const grub_menu_t *menu,
244     const grub_line_t *current);
245 grub_line_t *grub_menu_prev_line(const grub_menu_t *menu,
246     const grub_line_t *current);
247 
248 #ifdef __cplusplus
249 }
250 #endif
251 
252 #endif	/* _GRBMIMPL_H */
253