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/*
* Copyright (c) 2006 Dell, Inc.
* by Matt Domsch <Matt_Domsch@dell.com>
* Licensed under the GNU General Public license, version 2.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <unistd.h>
#include <sys/types.h>
#include "libbiosdevname.h"
#include "bios_dev_name.h"
static struct bios_dev_name_opts opts;
int nopirq;
int smver_mjr;
int smver_mnr;
static void usage(void)
{
fprintf(stderr, "Usage: biosdevname [options] [args]...\n");
fprintf(stderr, " Options:\n");
fprintf(stderr, " -i or --interface treat [args] as ethernet devs\n");
fprintf(stderr, " -d or --debug enable debugging\n");
fprintf(stderr, " --policy [physical | all_ethN ]\n");
fprintf(stderr, " --prefix [string] string use for embedded NICs (default='em')\n");
fprintf(stderr, " --smbios [x.y] Require SMBIOS x.y or greater\n");
fprintf(stderr, " --nopirq Don't use $PIR table for slot numbers\n");
fprintf(stderr, " Example: biosdevname -i eth0\n");
fprintf(stderr, " returns: em1\n");
fprintf(stderr, " when eth0 is an embedded NIC with label '1' on the chassis.\n");
fprintf(stderr, " You must be root to run this, as it must read from /dev/mem.\n");
}
static int
set_policy(const char *arg)
{
int rc = physical;
if (!strncmp("physical", arg, sizeof("physical")))
rc = physical;
else if (!strncmp("all_ethN", arg, sizeof("all_ethN")))
rc = all_ethN;
return rc;
}
static void
parse_opts(int argc, char **argv)
{
int c;
int option_index = 0;
while (1) {
static struct option long_options[] =
/* name, has_arg, flag, val */
{
{"debug", no_argument, 0, 'd'},
{"interface", no_argument, 0, 'i'},
{"policy", required_argument, 0, 'p'},
{"prefix", required_argument, 0, 'P'},
{"nopirq", no_argument, 0, 'x'},
{"smbios", required_argument, 0, 's'},
{0, 0, 0, 0}
};
c = getopt_long(argc, argv,
"dinp:",
long_options, &option_index);
if (c == -1)
break;
switch(c) {
case 'd':
opts.debug = 1;
break;
case 'i':
opts.interface = 1;
break;
case 'p':
opts.namingpolicy = set_policy(optarg);
break;
case 'P':
opts.prefix = optarg;
break;
case 's':
sscanf(optarg, "%u.%u", &smver_mjr, &smver_mnr);
break;
case 'x':
nopirq = 1;
break;
default:
usage();
exit(1);
}
}
if (optind < argc) {
opts.argc = argc-optind;
opts.argv = &argv[optind];
opts.optind = optind;
}
if (opts.prefix == NULL)
opts.prefix = "em";
}
static u_int32_t
cpuid (u_int32_t eax, u_int32_t ecx)
{
asm volatile (
"xor %%ebx, %%ebx; cpuid"
: "=a" (eax), "=c" (ecx)
: "a" (eax)
: "%ebx", "%edx");
return ecx;
}
/*
Algorithm suggested by:
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458
*/
static int
running_in_virtual_machine (void)
{
u_int32_t eax=1U, ecx=0U;
ecx = cpuid (eax, ecx);
if (ecx & 0x80000000U)
return 1;
return 0;
}
static int
running_as_root(void)
{
uid_t uid = geteuid();
if (uid != 0) {
fprintf(stderr, "This program must be run as root.\n");
return 0;
}
return 1;
}
int main(int argc, char *argv[])
{
int i, rc=0;
char *name;
void *cookie = NULL;
parse_opts(argc, argv);
if (!running_as_root())
exit(3);
if (running_in_virtual_machine())
exit(4);
cookie = setup_bios_devices(opts.namingpolicy, opts.prefix);
if (!cookie) {
rc = 1;
goto out;
}
if (opts.debug) {
unparse_bios_devices(cookie);
rc = 0;
goto out_cleanup;
}
if (!opts.interface) {
fprintf(stderr, "Unknown device type, try passing an option like -i\n");
rc = 1;
goto out_usage;
}
for (i=0; i<opts.argc; i++) {
name = kern_to_bios(cookie, opts.argv[i]);
if (name) {
printf("%s\n", name);
}
else
rc |= 2; /* one or more given devices weren't found */
}
goto out_cleanup;
out_usage:
usage();
out_cleanup:
cleanup_bios_devices(cookie);
out:
return rc;
}
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