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3
0
forked from pool/aaa_base
aaa_base/get_kernel_version.c

189 lines
4.4 KiB
C
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/* Copyright (C) 2000-2002 SuSE Linux AG, Nuremberg.
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, 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. */
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
static inline int my_is_alnum_punct(char c)
{
return isdigit(c) || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')
|| c == '.' || c == ',' || c == '-' || c == '_';
}
int
main (int argc, char *argv[])
{
FILE *fp;
#define MAX_VERSION_LENGTH 80
char buffer[4096 + MAX_VERSION_LENGTH]; /* buffer + sizeof ("Linux version .....") */
char command[512] = "";
int found = 0;
if (argc != 2)
{
char msg[] = "usage: get_kernel_version <kernel_image>\n";
write (2, msg, sizeof (msg));
return 1;
}
/* check if file exist and is compressed */
{
unsigned char buf [2];
int fd = open (argv[1], O_RDONLY);
if (fd == -1)
{
fprintf (stderr, "Cannot open kernel image \"%s\"\n", argv[1]);
return 1;
}
if (read (fd, buf, 2) != 2)
{
fprintf (stderr, "Short read\n");
close (fd);
return 1;
}
if (buf [0] == 037 && (buf [1] == 0213 || buf [1] == 0236))
{
snprintf (command, sizeof (command), "/bin/gzip -dc %s 2>/dev/null", argv[1]);
fp = popen (command, "r");
if (fp == NULL)
{
fprintf (stderr, "%s: faild\n", command);
return 1;
}
}
else
{
fp = fopen (argv[1],"r");
}
close (fd);
}
memset (buffer, 0, sizeof (buffer));
while (!found)
{
ssize_t in;
int i;
in = fread (&buffer[MAX_VERSION_LENGTH],
1, sizeof (buffer) - MAX_VERSION_LENGTH, fp);
if (in <= 0)
break;
for (i = 0; i < in; i++)
if (buffer[i] == 'L' && buffer[i+1] == 'i' &&
buffer[i+2] == 'n' && buffer[i+3] == 'u' &&
buffer[i+4] == 'x' && buffer[i+5] == ' ' &&
buffer[i+6] == 'v' && buffer[i+7] == 'e' &&
buffer[i+8] == 'r' && buffer[i+9] == 's' &&
buffer[i+10] == 'i' && buffer[i+11] == 'o' &&
buffer[i+12] == 'n' && buffer[i+13] == ' ')
{
int j = i+14;
int invalid_char = 0;
int in_number_range = 1;
/* check if we really found a version */
for (j = j+1; buffer[j] != ' '; j++)
{
char c = buffer[j];
if (c == '-')
in_number_range = 0;
if ((in_number_range && !isdigit(c) && c != '.') ||
(!in_number_range && !my_is_alnum_punct(c)))
{
invalid_char = 1;
break;
}
}
if (!invalid_char)
{
found = 1;
break;
}
}
if (found)
{
int j;
for (j = i+14; buffer[j] != ' '; j++);
buffer[j] = '\0';
printf ("%s\n", &buffer[i+14]);
}
else
{
if (in < (ssize_t)(sizeof (buffer) - MAX_VERSION_LENGTH))
break;
memcpy (&buffer[0], &buffer[sizeof (buffer) - MAX_VERSION_LENGTH],
MAX_VERSION_LENGTH);
memset (&buffer[MAX_VERSION_LENGTH], 0,
sizeof (buffer) - MAX_VERSION_LENGTH);
}
}
if(!found) {
/* ia32 kernel */
if(
!fseek(fp, 0x202, SEEK_SET) &&
fread(buffer, 1, 4, fp) == 4 &&
buffer[0] == 0x48 && buffer[1] == 0x64 &&
buffer[2] == 0x72 && buffer[3] == 0x53 &&
!fseek(fp, 0x20e, SEEK_SET) &&
fread(buffer, 1, 2, fp) == 2
) {
unsigned ofs = 0x200 + ((unsigned char *) buffer)[0] + (((unsigned char *) buffer)[1] << 8);
if(
!fseek(fp, ofs, SEEK_SET) &&
fread(buffer, 1, MAX_VERSION_LENGTH, fp) == MAX_VERSION_LENGTH
) {
char *s = buffer;
for(s[MAX_VERSION_LENGTH] = 0; *s; s++) if(*s == ' ') { *s = 0; break; }
if(*buffer) {
found = 1;
printf("%s\n", buffer);
}
}
}
}
if (command[0] != '\0')
pclose (fp);
else
fclose (fp);
if (found)
return 0;
else
return 1;
return 0;
}
/* vim: set sw=4 ts=8 sts=4 noet: */