mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-25 11:37:56 +00:00
c87a63c10f
used to extract modified boot hints to make loader(8)-time changes "sticky". It tries to use \ style quoting so that it can be used directly with foo.conf files. It can also extract specific variables.
132 lines
3.3 KiB
C
132 lines
3.3 KiB
C
/*
|
|
* Copyright (c) 2000 Peter Wemm <peter@freebsd.org>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
#include <sys/types.h>
|
|
#include <sys/sysctl.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <err.h>
|
|
#include <unistd.h>
|
|
|
|
static char sbuf[1024];
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
errx(1, "usage: [-h] [variable]");
|
|
}
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
int name2oid_oid[2];
|
|
int real_oid[CTL_MAXNAME+4];
|
|
size_t oidlen;
|
|
int ch, error, hflag, i, slen;
|
|
char *env, *eq, *name, *var, *val;
|
|
|
|
hflag = 0;
|
|
env = NULL;
|
|
while ((ch = getopt(argc, argv, "h")) != -1) {
|
|
switch (ch) {
|
|
case 'h':
|
|
hflag++;
|
|
break;
|
|
default:
|
|
usage();
|
|
}
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
if (argc > 0) {
|
|
env = argv[0];
|
|
argv++;
|
|
argc--;
|
|
}
|
|
if (argc > 0)
|
|
usage();
|
|
name2oid_oid[0] = 0; /* This is magic & undocumented! */
|
|
name2oid_oid[1] = 3;
|
|
oidlen = sizeof(real_oid);
|
|
name = "kern.environment";
|
|
error = sysctl(name2oid_oid, 2, real_oid, &oidlen, name, strlen(name));
|
|
if (error < 0)
|
|
err(1, "cannot find kern.environment base sysctl OID");
|
|
oidlen /= sizeof (int);
|
|
if (oidlen >= CTL_MAXNAME)
|
|
errx(1, "kern.environment OID is too large!");
|
|
real_oid[oidlen] = 0;
|
|
for (i = 0; ; i++) {
|
|
real_oid[oidlen + 1] = i;
|
|
slen = sizeof(sbuf) - 1;
|
|
error = sysctl(real_oid, oidlen + 2, sbuf, &slen, NULL, 0);
|
|
if (error < 0) {
|
|
if (errno != ENOENT)
|
|
err(1, "sysctl kern.environment.%d\n", i);
|
|
break;
|
|
}
|
|
sbuf[sizeof(sbuf) - 1] = '\0';
|
|
eq = strchr(sbuf, '=');
|
|
if (eq == NULL)
|
|
err(1, "malformed environment string: %s\n", sbuf);
|
|
var = sbuf;
|
|
*eq = '\0';
|
|
val = eq + 1;
|
|
if (env) {
|
|
if (strcmp(var, env) != 0)
|
|
continue;
|
|
printf("%s\n", val);
|
|
break;
|
|
}
|
|
if (hflag) {
|
|
if (strncmp(var, "hint.", 5) != 0)
|
|
continue;
|
|
/* FALLTHROUGH */
|
|
}
|
|
printf("%s=\"", var);
|
|
while (*val) {
|
|
switch (*val) {
|
|
case '"':
|
|
putchar('\\');
|
|
putchar('"');
|
|
break;
|
|
case '\\':
|
|
putchar('\\');
|
|
putchar('\\');
|
|
break;
|
|
default:
|
|
putchar(*val);
|
|
break;
|
|
}
|
|
val++;
|
|
}
|
|
printf("\"\n");
|
|
}
|
|
exit(0);
|
|
}
|