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Make brandelf test for known brands, and introduce a '-f' option to

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bypass the testing.

Partially submitted by:  Brian Feldman <green@feldman.dyn.ml.org>
This commit is contained in:
Eivind Eklund 1998-04-21 02:31:09 +00:00
parent ff1f112b1a
commit e3e9c8eed9
2 changed files with 40 additions and 8 deletions
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9
usr.bin/brandelf/brandelf.1
View File

@ -34,6 +34,7 @@
.Nd mark an ELF binary for a specific ABI
.Sh SYNOPSIS
.Nm brandelf
.Op Fl f
.Op Fl v
.Op Fl t Ar string
.Ar file ...
@ -43,6 +44,9 @@ This command marks an ELF binary to be run under a certain ABI for
.Pp
The options are as follows:
.Bl -tag -width Fl
.It Fl f
forces branding even if the brand requested is unknown, and disables
warnings for unknown brands.
.It Fl v
turns on verbose reporting
.It Fl t Ar string
@ -72,7 +76,10 @@ command:
.Dl % brandelf -t Linux file
.Sh DIAGNOSTICS
Exit status is 0 on success, and 1 if the command
fails if a file doesn't exist, is too short, or fails to brand properly.
fails if a file doesn't exist, is too short, fails to brand properly,
or the brand requested is not 'Linux' or 'FreeBSD' and the
.Fl f
option is not set.
.Sh HISTORY
The
.Nm

39
usr.bin/brandelf/brandelf.c
View File

@ -25,7 +25,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: brandelf.c,v 1.7 1997/06/23 06:47:12 charnier Exp $
* $Id: brandelf.c,v 1.8 1997/08/23 15:51:14 joerg Exp $
*/
#include <elf.h>
@ -36,6 +36,7 @@
#include <unistd.h>
#include <err.h>
static int iselftype(const char *);
static void usage __P((void));
int
@ -44,10 +45,13 @@ main(int argc, char **argv)
const char *type = "FreeBSD";
int retval = 0;
int ch, change = 0, verbose = 0;
int ch, change = 0, verbose = 0, force = 0;
while ((ch = getopt(argc, argv, "t:v")) != -1)
while ((ch = getopt(argc, argv, "ft:v")) != -1)
switch (ch) {
case 'f':
force = 1;
break;
case 'v':
verbose = 1;
break;
@ -62,6 +66,10 @@ main(int argc, char **argv)
argv += optind;
if (!argc)
errx(1, "no file(s) specified");
if (!force && !iselftype(type))
errx(1, "invalid ELF type '%s'", type);
while (argc) {
int fd;
char buffer[EI_NIDENT];
@ -71,7 +79,6 @@ main(int argc, char **argv)
warn("error opening file %s", argv[0]);
retval = 1;
goto fail;
}
if (read(fd, buffer, EI_NIDENT) < EI_NIDENT) {
warnx("file '%s' too short", argv[0]);
@ -83,13 +90,17 @@ main(int argc, char **argv)
warnx("file '%s' is not ELF format", argv[0]);
retval = 1;
goto fail;
}
}
if (!change) {
bzero(string, sizeof(string));
strncpy(string, &buffer[EI_BRAND], EI_NIDENT-EI_BRAND);
if (strlen(string)) {
fprintf(stdout, "File '%s' is of brand '%s'.\n",
fprintf(stdout,
"File '%s' is of brand '%s'.\n",
argv[0], string);
if (!force && !iselftype(string))
warnx("Brand '%s' is unknown",
string);
}
else
fprintf(stdout, "File '%s' has no branding.\n",
@ -115,6 +126,20 @@ main(int argc, char **argv)
static void
usage()
{
fprintf(stderr, "usage: brandelf [-t string] file ...\n");
fprintf(stderr, "usage: brandelf [-f] [-v] [-t string] file ...\n");
exit(1);
}
int
iselftype(const char *elftype) {
/* XXX - any more types? */
const char *elftypes[] = { "FreeBSD", "Linux" };
int elfwalk;
for (elfwalk = 0;
elfwalk < sizeof(elftypes)/sizeof(elftypes[0]);
elfwalk++)
if (strcmp(elftype, elftypes[elfwalk]) == 0)
return 1;
return 0;
}