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Initial kenv(1) hack for dumping the kernel environment. This can be

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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.
This commit is contained in:
Peter Wemm 2000-07-08 08:33:40 +00:00
parent 4c060eb855
commit c87a63c10f
7 changed files with 373 additions and 0 deletions
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5
bin/kenv/Makefile Normal file
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@ -0,0 +1,5 @@
# $FreeBSD$
PROG= kenv
.include <bsd.prog.mk>

50
bin/kenv/kenv.1 Normal file
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.\" 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.
.\"
.\" $FreeBSD$
.\"
.Dd June 6, 1993
.Dt KENV 1
.Os BSD 4
.Sh NAME
.Nm kenv
.Nd dump the kernel environment
.Sh SYNOPSIS
.Nm kenv
.Op Fl h
.Op variable
.Sh DESCRIPTION
.Nm kenv
will dump the kernel environment.
If the
.Fl h
flag is specified, it will limit the report to kernel probe hints.
If an optional variable name is specified,
.Nm
will only report that value.
.Sh SEE ALSO
.Xr loader 8
.Sh HISTORY
.Nm kenv
appeared in
.Fx 5.0 .

131
bin/kenv/kenv.c Normal file
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/*
* 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);
}

1
usr.bin/Makefile
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@ -65,6 +65,7 @@ SUBDIR= apply \
join \
jot \
kdump \
kenv \
key \
keyinfo \
keyinit \

5
usr.bin/kenv/Makefile Normal file
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# $FreeBSD$
PROG= kenv
.include <bsd.prog.mk>

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usr.bin/kenv/kenv.1 Normal file
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.\" 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.
.\"
.\" $FreeBSD$
.\"
.Dd June 6, 1993
.Dt KENV 1
.Os BSD 4
.Sh NAME
.Nm kenv
.Nd dump the kernel environment
.Sh SYNOPSIS
.Nm kenv
.Op Fl h
.Op variable
.Sh DESCRIPTION
.Nm kenv
will dump the kernel environment.
If the
.Fl h
flag is specified, it will limit the report to kernel probe hints.
If an optional variable name is specified,
.Nm
will only report that value.
.Sh SEE ALSO
.Xr loader 8
.Sh HISTORY
.Nm kenv
appeared in
.Fx 5.0 .

131
usr.bin/kenv/kenv.c Normal file
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/*
* 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);
}