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dmidecode.c
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dmidecode.c
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#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/mman.h>
#include "util.h"
#include "dmidecode.h"
struct dmi_data_t dmi_data;
struct dmi_header
{
u8 type;
u8 length;
u16 handle;
};
int myread(int fd, u8 *buf, size_t count, const char *prefix)
{
ssize_t r=1;
size_t r2=0;
while(r2!=count && r!=0)
{
r=read(fd, buf+r2, count-r2);
if(r==-1)
{
if(errno!=EINTR)
{
close(fd);
perror(prefix);
return -1;
}
}
else
r2+=r;
}
if(r2!=count)
{
close(fd);
fprintf(stderr, "%s: Unexpected end of file\n", prefix);
return -1;
}
return 0;
}
int checksum(const u8 *buf, size_t len)
{
u8 sum=0;
size_t a;
for(a=0; a<len; a++)
sum+=buf[a];
return (sum==0);
}
/*
* Copy a physical memory chunk into a memory buffer.
* This function allocates memory.
*/
void *mem_chunk(off_t base, off_t len, const char *devmem)
{
void *p;
int fd;
size_t mmoffset;
void *mmp;
if((fd=open(devmem, O_RDONLY))==-1)
{
perror(devmem);
return NULL;
}
if((p=malloc(len))==NULL)
return NULL;
mmoffset=base%getpagesize();
/*
* Please note that we don't use mmap() for performance reasons here,
* but to workaround problems many people encountered when trying
* to read from /dev/mem using regular read() calls.
*/
mmp=mmap(0, mmoffset+len, PROT_READ, MAP_SHARED, fd, base-mmoffset);
if(mmp==MAP_FAILED)
{
fprintf(stderr, "%s: ", devmem);
perror("mmap");
free(p);
return NULL;
}
memcpy(p, (u8 *)mmp+mmoffset, len);
if(munmap(mmp, mmoffset+0x20)==-1)
{
fprintf(stderr, "%s: ", devmem);
perror("munmap");
}
if(close(fd)==-1)
perror(devmem);
return p;
}
char *dmi_string(struct dmi_header *dm, u8 s)
{
char *bp=(char *)dm;
size_t i;
if(s==0)
return "Not Specified";
bp+=dm->length;
while(s>1 && *bp)
{
bp+=strlen(bp);
bp++;
s--;
}
if(!*bp)
return "<bad index>";
/* ASCII filtering */
for(i=0; i<strlen(bp); i++)
if(bp[i]<32 || bp[i]==127)
bp[i]='.';
return bp;
}
/*
* Main
*/
static void dmi_decode(u8 *data, u16 ver)
{
struct dmi_header *h=(struct dmi_header *)data;
/*
* Note: DMI types 31, 37, 38 and 39 are untested
*/
switch(h->type)
{
case 0: /* 3.3.1 BIOS Information */
if(h->length<0x12) break;
snprintf(dmi_data.bios_vendor, sizeof(dmi_data.bios_vendor), "%s", dmi_string(h, data[0x04]));
snprintf(dmi_data.bios_version, sizeof(dmi_data.bios_version), "%s", dmi_string(h, data[0x05]));
snprintf(dmi_data.bios_date, sizeof(dmi_data.bios_date), "%s", dmi_string(h, data[0x06]));
break;
case 1: /* 3.3.2 System Information */
if(h->length<0x08) break;
snprintf(dmi_data.sys_vendor, sizeof(dmi_data.bios_vendor), "%s", dmi_string(h, data[0x04]));
snprintf(dmi_data.sys_product, sizeof(dmi_data.bios_vendor), "%s", dmi_string(h, data[0x05]));
snprintf(dmi_data.sys_version, sizeof(dmi_data.bios_vendor), "%s", dmi_string(h, data[0x06]));
snprintf(dmi_data.sys_serial, sizeof(dmi_data.bios_vendor), "%s", dmi_string(h, data[0x07]));
if(h->length<0x19) break;
break;
case 2: /* 3.3.3 Base Board Information */
if(h->length<0x08) break;
snprintf(dmi_data.board_vendor, sizeof(dmi_data.bios_vendor), "%s", dmi_string(h, data[0x04]));
snprintf(dmi_data.board_product, sizeof(dmi_data.bios_vendor), "%s", dmi_string(h, data[0x05]));
snprintf(dmi_data.board_version, sizeof(dmi_data.bios_vendor), "%s", dmi_string(h, data[0x06]));
snprintf(dmi_data.board_serial, sizeof(dmi_data.bios_vendor), "%s", dmi_string(h, data[0x07]));
break;
default:
break;
}
trim(dmi_data.board_vendor);
trim(dmi_data.board_product);
trim(dmi_data.bios_version);
}
static void dmi_table(u32 base, u16 len, u16 num, u16 ver, const char *devmem)
{
u8 *buf;
u8 *data;
int i=0;
if((buf=mem_chunk(base, len, devmem))==NULL)
{
return;
}
data=buf;
while(i<num && data+sizeof(struct dmi_header)<=buf+len)
{
u8 *next;
struct dmi_header *h=(struct dmi_header *)data;
/* look for the next handle */
next=data+h->length;
while(next-buf+1<len && (next[0]!=0 || next[1]!=0))
next++;
next+=2;
if(next-buf<=len)
dmi_decode(data, ver);
else
printf("");
data=next;
i++;
}
free(buf);
}
static int smbios_decode(u8 *buf, const char *devmem)
{
if(checksum(buf, buf[0x05])
&& memcmp(buf+0x10, "_DMI_", 5)==0
&& checksum(buf+0x10, 0x0F))
{
dmi_table(DWORD(buf+0x18), WORD(buf+0x16), WORD(buf+0x1C),
(buf[0x06]<<8)+buf[0x07], devmem);
return 1;
}
return 0;
}
int do_dmi_decode() {
int found=0;
off_t fp;
const char *devmem="/dev/mem";
u8 *buf;
if((buf=mem_chunk(0xF0000, 0x10000, devmem))==NULL)
exit(1);
for(fp=0; fp<=0xFFF0; fp+=16)
{
if(memcmp(buf+fp, "_SM_", 4)==0 && fp<=0xFFE0)
{
if(smbios_decode(buf+fp, devmem))
found++;
fp+=16;
}
}
free(buf);
}