在网上找了好长时间关于获取CPUID的代码,都不是完全版本,回去还得改,自己写好了,是借鉴dmidecode中的代码成完的,希望多多提意见,谢谢。
这样做的缺点是必须得有root权限才可以,其它用户的权限是不能进行访问/dev/mem这个文件。
types.h
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#ifndef TYPES_H
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#define TYPES_H
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-
-
typedef unsigned char u8;
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typedef unsigned short u16;
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typedef signed short i16;
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typedef unsigned int u32;
-
-
#ifdef BIGENDIAN
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typedef struct {
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u32 h;
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u32 l;
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} u64;
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#else
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typedef struct {
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u32 l;
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u32 h;
-
} u64;
-
#endif
-
-
#ifdef ALIGNMENT_WORKAROUND
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static inline u64 U64(u32 low, u32 high)
-
{
-
u64 self;
-
-
self.l = low;
-
self.h = high;
-
-
return self;
-
}
-
#endif
-
-
#ifdef ALIGNMENT_WORKAROUND
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# ifdef BIGENDIAN
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# define WORD(x) (u16)((x)[1] + ((x)[0] << 8))
-
# define DWORD(x) (u32)((x)[3] + ((x)[2] << 8) + ((x)[1] << 16) + ((x)[0] << 24))
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# define QWORD(x) (U64(DWORD(x + 4), DWORD(x)))
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# else /* BIGENDIAN */
-
# define WORD(x) (u16)((x)[0] + ((x)[1] << 8))
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# define DWORD(x) (u32)((x)[0] + ((x)[1] << 8) + ((x)[2] << 16) + ((x)[3] << 24))
-
# define QWORD(x) (U64(DWORD(x), DWORD(x + 4)))
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# endif /* BIGENDIAN */
-
#else /* ALIGNMENT_WORKAROUND */
-
#define WORD(x) (u16)(*(const u16 *)(x))
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#define DWORD(x) (u32)(*(const u32 *)(x))
-
#define QWORD(x) (*(const u64 *)(x))
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#endif /* ALIGNMENT_WORKAROUND */
-
-
#endif
util.h
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <net/if.h>
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#include <string.h>
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-
#include "types.h"
-
-
struct dmi_header
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{
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u8 type;
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u8 length;
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u16 handle;
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u8 *data;
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};
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-
int checksum(const u8 *buf, size_t len);
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void *mem_chunk(size_t base, size_t len, const char *devmem);
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u64 u64_range(u64 start, u64 end);
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void to_dmi_header(struct dmi_header *h, u8 *data);
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int get_cpuid(char *cpuid);
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int get_mac(char* mac);
util.c
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#include <sys/types.h>
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#include <sys/stat.h>
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-
#ifdef USE_MMAP
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#include <sys/mman.h>
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#ifndef MAP_FAILED
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#define MAP_FAILED ((void *) -1)
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#endif /* !MAP_FAILED */
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#endif /* USE MMAP */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <errno.h>
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-
#include "types.h"
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#include "util.h"
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static int myread(int fd, u8 *buf, size_t count, const char *prefix)
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{
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ssize_t r = 1;
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size_t r2 = 0;
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while (r2 != count && r != 0)
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{
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r = read(fd, buf + r2, count - r2);
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if (r == -1)
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{
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if (errno != EINTR)
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{
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close(fd);
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perror(prefix);
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return -1;
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}
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}
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else
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r2 += r;
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}
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if (r2 != count)
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{
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close(fd);
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fprintf(stderr, "%s: Unexpected end of file\n", prefix);
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return -1;
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}
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return 0;
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}
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int checksum(const u8 *buf, size_t len)
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{
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u8 sum = 0;
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size_t a;
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for (a = 0; a < len; a++)
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sum += buf[a];
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return (sum == 0);
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}
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/*
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* Copy a physical memory chunk into a memory buffer.
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* This function allocates memory.
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*/
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void *mem_chunk(size_t base, size_t len, const char *devmem)
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{
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void *p;
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int fd;
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#ifdef USE_MMAP
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size_t mmoffset;
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void *mmp;
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#endif
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if ((fd = open(devmem, O_RDONLY)) == -1)
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{
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perror(devmem);
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return NULL;
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}
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if ((p = malloc(len)) == NULL)
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{
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perror("malloc");
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return NULL;
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}
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#ifdef USE_MMAP
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#ifdef _SC_PAGESIZE
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mmoffset = base % sysconf(_SC_PAGESIZE);
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#else
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mmoffset = base % getpagesize();
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#endif /* _SC_PAGESIZE */
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/*
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* Please note that we don't use mmap() for performance reasons here,
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* but to workaround problems many people encountered when trying
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* to read from /dev/mem using regular read() calls.
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*/
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mmp = mmap(0, mmoffset + len, PROT_READ, MAP_SHARED, fd, base - mmoffset);
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if (mmp == MAP_FAILED)
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goto try_read;
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-
memcpy(p, (u8 *)mmp + mmoffset, len);
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-
if (munmap(mmp, mmoffset + len) == -1)
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{
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fprintf(stderr, "%s: ", devmem);
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perror("munmap");
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}
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-
goto out;
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-
#endif /* USE_MMAP */
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try_read:
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if (lseek(fd, base, SEEK_SET) == -1)
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{
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fprintf(stderr, "%s: ", devmem);
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perror("lseek");
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free(p);
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return NULL;
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}
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-
if (myread(fd, p, len, devmem) == -1)
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{
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free(p);
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return NULL;
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}
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-
out:
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if (close(fd) == -1)
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perror(devmem);
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return p;
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}
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void to_dmi_header(struct dmi_header *h, u8 *data)
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{
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h->type = data[0];
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h->length = data[1];
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h->handle = WORD(data + 2);
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h->data = data;
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}
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int get_cpuid(char *cpuid)
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{
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char devmem[10] = "/dev/mem";
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u16 len;
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u16 num;
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size_t fp;
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u8 *buf=NULL, *nbuf=NULL, *data, *p;
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int i = 0;
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if ((buf = mem_chunk(0xF0000, 0x10000, devmem)) == NULL)
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{
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free(buf);
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return 0;
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}
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for (fp = 0; fp <= 0xFFF0; fp += 16)
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{
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if(memcmp(buf + fp, "_SM_", 4) == 0 && fp <= 0xFFE0)
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{
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len = WORD(buf + fp + 0x16);
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num = WORD(buf + fp + 0x1C);
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if (!checksum(buf + fp, (buf + fp)[0x05]) || memcmp(buf + fp + 0x10, "_DMI_", 5) != 0 || !checksum(buf + fp + 0x10, 0x0F))
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{
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free(buf);
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return 0;
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}
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if ((nbuf = mem_chunk(DWORD(buf + fp + 0x18), len, devmem)) == NULL)
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{
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fprintf(stderr, "Table is unreachable, sorry.\n");
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free(buf);
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free(nbuf);
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return 0;
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}
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data = nbuf;
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while (i < num && data+4 <= nbuf + len)
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{
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u8 *next;
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struct dmi_header h;
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to_dmi_header(&h, data);
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-
if (h.length < 4)
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{
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printf("Invalid entry length (%u). DMI table is "
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"broken! Stop.\n\n", (unsigned int)h.length);
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free(buf);
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free(nbuf);
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return 0;
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}
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next = data + h.length;
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while (next - nbuf + 1 < len && (next[0] != 0 || next[1] != 0))
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next++;
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next += 2;
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if (h.type ==4)
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{
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p = h.data + 0x08;
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//printf("CPUID:%02X%02X%02X%02X%02X%02X%02X%02X\n", p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
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sprintf(cpuid, "%02X%02X%02X%02X%02X%02X%02X%02X", p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
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free(buf);
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free(nbuf);
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return 1;
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}
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data = next;
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i++;
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}
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fp += 16;
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}
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}
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free(buf);
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free(nbuf);
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return 0;
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}
-
-
int get_mac(char* mac)
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{
-
int sockfd;
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struct ifreq tmp;
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char mac_addr[30];
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-
sockfd = socket(AF_INET, SOCK_STREAM, 0);
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if( sockfd < 0)
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{
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perror("create socket fail\n");
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return -1;
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}
-
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memset(&tmp,0,sizeof(struct ifreq));
-
strncpy(tmp.ifr_name,"eth0",sizeof(tmp.ifr_name)-1);
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if( (ioctl(sockfd,SIOCGIFHWADDR,&tmp)) < 0 )
-
{
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printf("mac ioctl error\n");
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return -1;
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}
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sprintf(mac_addr, "%02x%02x%02x%02x%02x%02x",
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(unsigned char)tmp.ifr_hwaddr.sa_data[0],
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(unsigned char)tmp.ifr_hwaddr.sa_data[1],
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(unsigned char)tmp.ifr_hwaddr.sa_data[2],
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(unsigned char)tmp.ifr_hwaddr.sa_data[3],
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(unsigned char)tmp.ifr_hwaddr.sa_data[4],
-
(unsigned char)tmp.ifr_hwaddr.sa_data[5]
-
);
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close(sockfd);
-
memcpy(mac,mac_addr,strlen(mac_addr));
-
-
return 0;
-
}
getsysinfo.c
-
#include <stdio.h>
-
#include "util.h"
-
-
int main()
-
{
-
char cpuid[20], mac[20];
-
get_cpuid(cpuid);
-
printf("CPUID:%s\n", cpuid);
-
get_mac(mac);
-
printf("MAC:%s\n", mac);
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return 0;
-
}
Makefile
-
# Copyright (C) Zhou Zhongbai 46784314@qq.com
-
-
CC = gcc
-
CFLAGS = -W -Wall -Wshadow -Wstrict-prototypes -Wpointer-arith -Wcast-qual \
-
-Wcast-align -Wwrite-strings -Wmissing-prototypes -Winline -Wundef
-
#CFLAGS += -DBIGENDIAN
-
#CFLAGS += -DALIGNMENT_WORKAROUND
-
-
# When debugging, disable -O2 and enable -g.
-
CFLAGS += -O2
-
#CFLAGS += -g
-
-
# Pass linker flags here
-
LDFLAGS =
-
-
DESTDIR =
-
prefix = /usr/local
-
sbindir = $(prefix)/sbin
-
mandir = $(prefix)/share/man
-
man8dir = $(mandir)/man8
-
docdir = $(prefix)/share/doc/getcpuid
-
-
INSTALL := install
-
INSTALL_DATA := $(INSTALL) -m 644
-
INSTALL_DIR := $(INSTALL) -m 755 -d
-
INSTALL_PROGRAM := $(INSTALL) -m 755
-
RM := rm -f
-
-
# BSD make provides $MACHINE, but GNU make doesn't
-
MACHINE ?= $(shell uname -m 2>/dev/null)
-
-
PROGRAMS = getsysinfo
-
-
all : $(PROGRAMS)
-
-
#
-
# Programs
-
#
-
-
getsysinfo : getsysinfo.o util.o
-
$(CC) $(LDFLAGS) getsysinfo.o util.o -o $@
-
-
#
-
# Objects
-
#
-
-
getsysinfo.o : getsysinfo.c util.h
-
$(CC) $(CFLAGS) -c $< -o $@
-
util.o : util.c util.h
-
$(CC) $(CFLAGS) -c $< -o $@
-
-
#
-
# Commands
-
#
-
-
strip : $(PROGRAMS)
-
strip $(PROGRAMS)
-
-
install : install-bin install-man install-doc
-
-
uninstall : uninstall-bin uninstall-man uninstall-doc
-
-
install-bin : $(PROGRAMS)
-
$(INSTALL_DIR) $(DESTDIR)$(sbindir)
-
for program in $(PROGRAMS) ; do \
-
$(INSTALL_PROGRAM) $$program $(DESTDIR)$(sbindir) ; done
-
-
uninstall-bin :
-
for program in $(PROGRAMS) ; do \
-
$(RM) $(DESTDIR)$(sbindir)/$$program ; done
-
-
install-man :
-
$(INSTALL_DIR) $(DESTDIR)$(man8dir)
-
for program in $(PROGRAMS) ; do \
-
$(INSTALL_DATA) man/$$program.8 $(DESTDIR)$(man8dir) ; done
-
-
uninstall-man :
-
for program in $(PROGRAMS) ; do \
-
$(RM) $(DESTDIR)$(man8dir)/$$program.8 ; done
-
-
install-doc :
-
$(INSTALL_DIR) $(DESTDIR)$(docdir)
-
$(INSTALL_DATA) README $(DESTDIR)$(docdir)
-
$(INSTALL_DATA) CHANGELOG $(DESTDIR)$(docdir)
-
$(INSTALL_DATA) AUTHORS $(DESTDIR)$(docdir)
-
-
uninstall-doc :
-
$(RM) -r $(DESTDIR)$(docdir)
-
-
clean :
-
$(RM) *.o $(PROGRAMS)
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