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authorPeter Wemm <peter@FreeBSD.org>2000-07-08 08:33:40 +0000
committerPeter Wemm <peter@FreeBSD.org>2000-07-08 08:33:40 +0000
commitc87a63c10f22774db603ed6530e2e309a0372128 (patch)
treea2101e5c3f3c1359e1b64daa924cdb74a9fa5787 /bin/kenv
parent4c060eb855eae7bf331ff28dbbea46a778345765 (diff)
downloadsrc-c87a63c10f22774db603ed6530e2e309a0372128.tar.gz
src-c87a63c10f22774db603ed6530e2e309a0372128.zip
Initial kenv(1) hack for dumping the kernel environment. This can be
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.
Notes
Notes: svn path=/head/; revision=62813
Diffstat (limited to 'bin/kenv')
-rw-r--r--bin/kenv/Makefile5
-rw-r--r--bin/kenv/kenv.150
-rw-r--r--bin/kenv/kenv.c131
3 files changed, 186 insertions, 0 deletions
diff --git a/bin/kenv/Makefile b/bin/kenv/Makefile
new file mode 100644
index 000000000000..33a6dfc3bff5
--- /dev/null
+++ b/bin/kenv/Makefile
@@ -0,0 +1,5 @@
+# $FreeBSD$
+
+PROG= kenv
+
+.include <bsd.prog.mk>
diff --git a/bin/kenv/kenv.1 b/bin/kenv/kenv.1
new file mode 100644
index 000000000000..e80b9443270a
--- /dev/null
+++ b/bin/kenv/kenv.1
@@ -0,0 +1,50 @@
+.\" 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 .
diff --git a/bin/kenv/kenv.c b/bin/kenv/kenv.c
new file mode 100644
index 000000000000..4e5970a2c8ab
--- /dev/null
+++ b/bin/kenv/kenv.c
@@ -0,0 +1,131 @@
+/*
+ * 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);
+}