vpddecode.c

DMIdecode,在Linux下運行,可以將系統的DMI信息讀寫出來.

/*
 * IBM Vital Product Data decoder
 *
 *   (C) 2003-2005 Jean Delvare <[e-mail]>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 *   For the avoidance of doubt the "preferred form" of this code is one which
 *   is in an open unpatent encumbered format. Where cryptographic key signing
 *   forms part of the process of creating an executable the information
 *   including keys needed to generate an equivalently functional executable
 *   are deemed to be part of the source code.
 *
 * References:
 *  - IBM "Using the BIOS Build ID to identify Thinkpad systems"
 *    Revision 2006-01-31
 *    http://www-307.ibm.com/pc/support/site.wss/MIGR-45120.html
 *
 * Notes:
 *  - Main part of the code is taken directly from biosdecode, with an
 *    additional command line interface and a few experimental features.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "version.h"
#include "config.h"
#include "types.h"
#include "util.h"
#include "vpdopt.h"

static void print_entry(const char *name, const u8 *p, size_t len)
{
	size_t i;
	
	if(name!=NULL)
		printf("%s: ", name);
	for(i=0; i<len; i++)
	{
		/* ASCII filtering */
		if(p[i]>=32 && p[i]<127)
			printf("%c", p[i]);
		else if(p[i]!=0)
			printf(".");
	}
	printf("\n");
}

static void dump(const u8 *p, u8 len)
{
	int done, i, min;

	for(done=0; done<len; done+=16)
	{
		printf("%02X:", done);
		min=(len-done<16)?len-done:16;

		/* As hexadecimal first */
		for(i=0; i<min; i++)
			printf(" %02X", p[done+i]);
		for(; i<16; i++) /* Complete line if needed */
			printf("   ");
		printf("     ");

		/* And now as text, with ASCII filtering */
		for(i=0; i<min; i++)
			printf("%c", (p[done+i]>=32 && p[done+i]<127)?
				p[done+i]:'.');
		printf("\n");
	}
}

static int decode(const u8 *p)
{
	if(p[5]<0x30)
		return 0;
	
	/* XSeries have longer records, exact length seems to vary. */
	if(!(p[5]>=0x45 && checksum(p, p[5]))
	/* Some Netvista seem to work with this. */
	&& !(checksum(p, 0x30))
	/* The Thinkpad/Thinkcentre checksum does *not* include the first
	   13 bytes. */
	&& !(checksum(p+0x0D, 0x30-0x0D)))
	{
		/* A few systems have a bad checksum (xSeries 325, 330, 335
		   and 345 with early BIOS) but the record is otherwise
		   valid. */
		if(!(opt.flags & FLAG_QUIET))
			printf("Bad checksum! Please report.\n");
	}
	
	if(opt.string!=NULL)
	{
		if(opt.string->offset+opt.string->len<p[5])
			print_entry(NULL, p+opt.string->offset,
			            opt.string->len);
		return 1;
	}

	print_entry("BIOS Build ID", p+0x0D, 9);
	print_entry("Box Serial Number", p+0x16, 7);
	print_entry("Motherboard Serial Number", p+0x1D, 11);
	print_entry("Machine Type/Model", p+0x28, 7);
	
	if(p[5]<0x44)
		return 1;
	
	print_entry("BIOS Release Date", p+0x30, 8);
	print_entry("Default Flash Image File Name", p+0x38, 12);

	if(p[5]>=0x46 && p[0x44]!=0x00)
	{
		printf("%s: %u (Please report!)\n", "BIOS Revision",
		       p[0x44]);
	}
	
	return 1;
}

int main(int argc, char * const argv[])
{
	u8 *buf;
	int found=0;
	unsigned int fp;
	
	if(sizeof(u8)!=1)
	{
		fprintf(stderr, "%s: compiler incompatibility\n", argv[0]);
		exit(255);
	}
	
	/* Set default option values */
	opt.devmem=DEFAULT_MEM_DEV;
	opt.flags=0;

	if(parse_command_line(argc, argv)<0)
		exit(2);

	if(opt.flags & FLAG_HELP)
	{
		print_help();
		return 0;
	}

	if(opt.flags & FLAG_VERSION)
	{
		printf("%s\n", VERSION);
		return 0;
	}

	if(!(opt.flags & FLAG_QUIET))
		printf("# vpddecode %s\n", VERSION);

	if((buf=mem_chunk(0xF0000, 0x10000, opt.devmem))==NULL)
		exit(1);

	for(fp=0; fp<=0xFFF0; fp+=4)
	{
		u8 *p=buf+fp;

		if(memcmp((char *)p, "\252\125VPD", 5)==0
		&& fp+p[5]-1<=0xFFFF)
		{
			if(fp%16 && !(opt.flags & FLAG_QUIET))
				printf("Unaligned address (%#x), please report!\n",
				       0xf0000+fp);
			if(opt.flags & FLAG_DUMP)
			{
				dump(p, p[5]);
				found++;
			}
			else
			{
				if(decode(p))
					found++;
			}
		}
	}

	free(buf);
	
	if(!found && !(opt.flags && FLAG_QUIET))
		printf("# No VPD structure found, sorry.\n");
	
	return 0;
}