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/* Simple program for dumping DMI/SMBIOS data
* Based on code from python-dmidecode/dmidecode.c
*
* Copyright 2009 David Sommerseth <davids@redhat.com>
* Copyright 2002-2008 Jean Delvare <khali@linux-fr.org>
* Copyright 2000-2002 Alan Cox <alan@redhat.com>
*
*
* 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "types.h"
#include "util.h"
#include "dmidump.h"
#include "efi.h"
/*
* Build a crafted entry point with table address hard-coded to 32,
* as this is where we will put it in the output file. We adjust the
* DMI checksum appropriately. The SMBIOS checksum needs no adjustment.
*/
static void overwrite_dmi_address(u8 * buf)
{
buf[0x05] += buf[0x08] + buf[0x09] + buf[0x0A] + buf[0x0B] - 32;
buf[0x08] = 32;
buf[0x09] = 0;
buf[0x0A] = 0;
buf[0x0B] = 0;
}
int write_dump(size_t base, size_t len, const void *data, const char *dumpfile, int add)
{
FILE *f;
f = fopen(dumpfile, add ? "r+b" : "wb");
if(!f) {
fprintf(stderr, "%s: ", dumpfile);
perror("fopen");
return -1;
}
if(fseek(f, base, SEEK_SET) != 0) {
fprintf(stderr, "%s: ", dumpfile);
perror("fseek");
goto err_close;
}
if(fwrite(data, len, 1, f) != 1) {
fprintf(stderr, "%s: ", dumpfile);
perror("fwrite");
goto err_close;
}
if(fclose(f)) {
fprintf(stderr, "%s: ", dumpfile);
perror("fclose");
return -1;
}
return 0;
err_close:
fclose(f);
return -1;
}
int dumpling(u8 * buf, const char *dumpfile, u8 mode)
{
u32 base;
u16 len;
if(mode == NON_LEGACY) {
if(!checksum(buf, buf[0x05]) || !memcmp(buf + 0x10, "_DMI_", 5) == 0 ||
!checksum(buf + 0x10, 0x0F))
return 0;
base = DWORD(buf + 0x18);
len = WORD(buf + 0x16);
} else {
if(!checksum(buf, 0x0F))
return 0;
base = DWORD(buf + 0x08);
len = WORD(buf + 0x06);
}
u8 *buff;
if((buff = mem_chunk(NULL, base, len, DEFAULT_MEM_DEV)) != NULL) {
//. Part 1.
#ifdef NDEBUG
printf("# Writing %d bytes to %s.\n", len, dumpfile);
#endif
write_dump(32, len, buff, dumpfile, 0);
free(buff);
//. Part 2.
if(mode != LEGACY) {
u8 crafted[32];
memcpy(crafted, buf, 32);
overwrite_dmi_address(crafted + 0x10);
#ifdef NDEBUG
printf("# Writing %d bytes to %s.\n", crafted[0x05], dumpfile);
#endif
write_dump(0, crafted[0x05], crafted, dumpfile, 1);
} else {
u8 crafted[16];
memcpy(crafted, buf, 16);
overwrite_dmi_address(crafted);
#ifdef NDEBUG
printf("# Writing %d bytes to %s.\n", 0x0F, dumpfile);
#endif
write_dump(0, 0x0F, crafted, dumpfile, 1);
}
} else {
fprintf(stderr, "Failed to read table, sorry.\n");
}
//. TODO: Cleanup
return 1;
}
int dump(const char *memdev, const char *dumpfile)
{
/* On success, return found, otherwise return -1 */
int ret = 0;
int found = 0;
size_t fp;
int efi;
u8 *buf;
/* First try EFI (ia64, Intel-based Mac) */
efi = address_from_efi(NULL, &fp);
if(efi == EFI_NOT_FOUND) {
/* Fallback to memory scan (x86, x86_64) */
if((buf = mem_chunk(NULL, 0xF0000, 0x10000, memdev)) != NULL) {
for(fp = 0; fp <= 0xFFF0; fp += 16) {
if(memcmp(buf + fp, "_SM_", 4) == 0 && fp <= 0xFFE0) {
if(dumpling(buf + fp, dumpfile, NON_LEGACY))
found++;
fp += 16;
} else if(memcmp(buf + fp, "_DMI_", 5) == 0) {
if(dumpling(buf + fp, dumpfile, LEGACY))
found++;
}
}
} else
ret = -1;
} else if(efi == EFI_NO_SMBIOS) {
ret = -1;
} else {
if((buf = mem_chunk(NULL, fp, 0x20, memdev)) == NULL)
ret = -1;
else if(dumpling(buf, dumpfile, NON_LEGACY))
found++;
}
if(ret == 0) {
free(buf);
if(!found) {
ret = -1;
}
}
return ret == 0 ? found : ret;
}
#ifdef _DMIDUMP_MAIN_
int main(int argc, char **argv)
{
if( argc != 3 ) {
fprintf(stderr, "Usage: %s </dev/mem device> <destfile>\n", argv[0]);
return 1;
}
dump(argv[1], argv[2]);
return 0;
}
#endif
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