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prephandlers.c revision 1.1
      1 /*	$NetBSD: prephandlers.c,v 1.1 2007/03/01 16:49:48 garbled Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2006 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Tim Rightnour.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/types.h>
     40 #include <sys/ioctl.h>
     41 #include <err.h>
     42 #include <errno.h>
     43 #include <fcntl.h>
     44 #include <string.h>
     45 #include <stdio.h>
     46 #include <string.h>
     47 #include <unistd.h>
     48 
     49 #include <machine/nvram.h>
     50 
     51 #include "defs.h"
     52 
     53 extern char *path_prepnvram;
     54 extern int eval;
     55 extern int verbose;
     56 
     57 static char err_str[BUFSIZE];
     58 
     59 static void prep_notsupp(struct extabent *, struct pnviocdesc *, char *);
     60 
     61 /*
     62  * XXX
     63  * This file needs a recalc checksum routine, and a routine to call a
     64  * write back to nvram.  The prep NVRAM is stored in RAM after boot, to
     65  * prevent horrific bitbanging on the NVRAM chip, we read and write into RAM
     66  * until a save operation is called.  At that time we write the ram-based
     67  * NVRAM back to the physical NVRAM.  This is a fairly expensive operation.
     68  */
     69 
     70 
     71 /*
     72  * There are several known fields that I either don't know how to
     73  * deal with or require special treatment.
     74  */
     75 static struct extabent prepextab[] = {
     76 	{NULL, prep_notsupp},
     77 };
     78 #define BARF(str1, str2) {						\
     79 	snprintf(err_str, sizeof err_str, "%s: %s", (str1), (str2));	\
     80 	++eval;								\
     81 	return (err_str);						\
     82 };
     83 
     84 void
     85 prep_action(char *keyword, char *arg)
     86 {
     87 	char *cp;
     88 
     89 	if ((cp = prep_handler(keyword, arg)) != NULL)
     90 		warnx("%s", cp);
     91 	return;
     92 }
     93 
     94 char *
     95 prep_handler(char *keyword, char *arg)
     96 {
     97 	struct pnviocdesc nvio;
     98 	struct extabent *ex;
     99 	char nvio_buf[BUFSIZE];
    100 	int fd;
    101 
    102 	if ((fd = open(path_prepnvram, arg ? O_RDWR : O_RDONLY, 0640)) < 0)
    103 		BARF(path_prepnvram, strerror(errno));
    104 
    105 	/* Check to see if it's a special-case keyword. */
    106 	for (ex = prepextab; ex->ex_keyword != NULL; ++ex)
    107 		if (strcmp(ex->ex_keyword, keyword) == 0)
    108 			break;
    109 
    110 	memset(&nvio_buf[0], 0, sizeof(nvio_buf));
    111 	memset(&nvio, 0, sizeof(nvio));
    112 	nvio.pnv_name = keyword;
    113 	nvio.pnv_namelen = strlen(nvio.pnv_name);
    114 
    115 	if (arg) {
    116 		if (verbose) {
    117 			printf("old: ");
    118 
    119 			nvio.pnv_buf = &nvio_buf[0];
    120 			nvio.pnv_buflen = sizeof(nvio_buf);
    121 			if (ioctl(fd, PNVIOCGET, (char *) &nvio) < 0)
    122 				BARF("PNVIOCGET", strerror(errno));
    123 
    124 			if (nvio.pnv_buflen <= 0) {
    125 				printf("nothing available for %s\n", keyword);
    126 				goto out;
    127 			}
    128 			if (ex->ex_keyword != NULL)
    129 				(*ex->ex_handler) (ex, &nvio, NULL);
    130 			else
    131 				printf("%s\n", nvio.pnv_buf);
    132 		}
    133 out:
    134 		if (ex->ex_keyword != NULL)
    135 			(*ex->ex_handler) (ex, &nvio, arg);
    136 		else {
    137 			nvio.pnv_buf = arg;
    138 			nvio.pnv_buflen = strlen(arg);
    139 		}
    140 
    141 		if (ioctl(fd, PNVIOCSET, (char *) &nvio) < 0)
    142 			BARF("invalid keyword", keyword);
    143 
    144 		if (verbose) {
    145 			printf("new: ");
    146 			if (ex->ex_keyword != NULL)
    147 				(*ex->ex_handler) (ex, &nvio, NULL);
    148 			else
    149 				printf("%s\n", nvio.pnv_buf);
    150 		}
    151 	} else {
    152 		nvio.pnv_buf = &nvio_buf[0];
    153 		nvio.pnv_buflen = sizeof(nvio_buf);
    154 		if (ioctl(fd, PNVIOCGET, (char *) &nvio) < 0)
    155 			BARF("PNVIOCGET", strerror(errno));
    156 
    157 		if (nvio.pnv_buflen <= 0) {
    158 			(void) snprintf(err_str, sizeof err_str,
    159 			    "nothing available for %s", keyword);
    160 			return (err_str);
    161 		}
    162 		if (ex->ex_keyword != NULL)
    163 			(*ex->ex_handler) (ex, &nvio, NULL);
    164 		else
    165 			printf("%s=%s\n", keyword, nvio.pnv_buf);
    166 	}
    167 
    168 	(void) close(fd);
    169 	return (NULL);
    170 }
    171 /* ARGSUSED */
    172 static void
    173 prep_notsupp(struct extabent * exent, struct pnviocdesc * nviop, char *arg)
    174 {
    175 
    176 	warnx("property `%s' not yet supported", exent->ex_keyword);
    177 }
    178 /*
    179  * Derrived from op_dump().  This should dump the contents of the PReP
    180  * NVRAM chip.
    181  */
    182 
    183 void
    184 prep_dump()
    185 {
    186 	struct pnviocdesc nvio1, nvio2;
    187 	char buf1[BUFSIZE], buf2[BUFSIZE], buf3[BUFSIZE], buf4[BUFSIZE];
    188 	int fd, optnode, nrofvars;
    189 
    190 	if ((fd = open(path_prepnvram, O_RDONLY, 0640)) < 0)
    191 		err(1, "open: %s", path_prepnvram);
    192 
    193 	memset(&nvio1, 0, sizeof(nvio1));
    194 
    195 	if (ioctl(fd, PNVIOCGETNUMGE, (char *) &nvio1) < 0)
    196 		err(1, "PNVIOCGETNUMGE");
    197 
    198 	nrofvars = nvio1.pnv_num;
    199 	if (nrofvars < 1)
    200 		err(1, "PNVIOCGETNUMGE");
    201 
    202 	memset(&nvio1, 0, sizeof(nvio1));
    203 	memset(buf1, 0, sizeof(buf1));
    204 	memset(buf2, 0, sizeof(buf2));
    205 	memset(buf3, 0, sizeof(buf3));
    206 	memset(buf4, 0, sizeof(buf4));
    207 	nvio1.pnv_name = NULL;
    208 	nvio1.pnv_buf = buf2;
    209 	nvio2.pnv_name = buf3;
    210 	nvio2.pnv_buf = buf4;
    211 	for (optnode = 0; optnode < nrofvars; optnode++) {
    212 		nvio1.pnv_buflen = sizeof(buf2);
    213 
    214 		if (ioctl(fd, PNVIOCGETNEXTNAME, (char *) &nvio1) < 0)
    215 			err(1, "PNVIOCGETNEXTNAME");
    216 
    217 		if (optnode == 0)
    218 			nvio1.pnv_name = buf1;
    219 
    220 		/* the property name is now stored in nvio1.pnv_buf */
    221 		strcpy(nvio2.pnv_name, nvio1.pnv_buf);	/* safe */
    222 		nvio2.pnv_namelen = strlen(nvio2.pnv_name);
    223 
    224 		if (nvio2.pnv_namelen == 0) {
    225 			(void) close(fd);
    226 			return;
    227 		}
    228 		memset(nvio2.pnv_buf, 0, sizeof(buf4));
    229 		nvio2.pnv_buflen = sizeof(buf4);
    230 
    231 		if (ioctl(fd, PNVIOCGET, (char *) &nvio2) < 0)
    232 			err(1, "PNVIOCGET");
    233 
    234 		printf("%s=%s\n", nvio1.pnv_buf, nvio2.pnv_buf);
    235 
    236 		/* now clean out the buffers for the next loop */
    237 
    238 		memset(nvio1.pnv_name, 0, sizeof(buf1));
    239 		memset(nvio1.pnv_buf, 0, sizeof(buf2));
    240 		strcpy(nvio1.pnv_name, nvio2.pnv_name);	/* safe */
    241 		nvio1.pnv_namelen = strlen(nvio1.pnv_name);
    242 	}
    243 	close(fd);
    244 }
    245