From 24c1598929ac4cfd2c0a1e3c34b46a35ed1775bd Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Mon, 11 Nov 2024 21:14:14 -0500
Subject: kernel: sysctl: Add initial sysctl implementation
Signed-off-by: Ian Moffett <ian@osmora.org>
---
sys/include/sys/sysctl.h | 77 +++++++++++++++++++++++++++++++++++++
sys/kern/kern_sysctl.c | 98 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 175 insertions(+)
create mode 100644 sys/include/sys/sysctl.h
create mode 100644 sys/kern/kern_sysctl.c
(limited to 'sys')
diff --git a/sys/include/sys/sysctl.h b/sys/include/sys/sysctl.h
new file mode 100644
index 0000000..364d8e5
--- /dev/null
+++ b/sys/include/sys/sysctl.h
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * 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.
+ * 3. Neither the name of Hyra nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
+ */
+
+#ifndef _SYS_SYSCTL_H_
+#define _SYS_SYSCTL_H_
+
+#include <sys/types.h>
+#include <sys/param.h>
+
+#define KERN_OSTYPE 0
+#define KERN_OSRELEASE 1
+#define KERN_VERSION 2
+
+/*
+ * Option types (i.e., int, string, etc) for
+ * sysctl entries.
+ *
+ * TODO: Add SYSCTL_OPTYPE_NODE to define sysctl nodes in
+ * the hierarchy.
+ */
+#define SYSCTL_OPTYPE_INT_RO 0
+#define SYSCTL_OPTYPE_STR_RO 1
+#define SYSCTL_OPTYPE_INT 2
+#define SYSCTL_OPTYPE_STR 3
+
+#if defined(_KERNEL)
+struct sysctl_entry {
+ int enttype;
+ int optype;
+ void *data;
+};
+#endif /* _KERNEL */
+
+/*
+ * The sysctl entries use an MIB (Management Information Base) style
+ * naming scheme and follow a hierarchical naming structure. This is
+ * similar to the structure described in RFC 3418 for the Simple
+ * Network Management Protocol (SNMP).
+ */
+struct sysctl_args {
+ int *name;
+ int nlen;
+ void *oldp;
+ size_t *oldlenp;
+ void *newp;
+ size_t newlen;
+};
+
+int sysctl(struct sysctl_args *args);
+
+#endif /* !_SYS_SYSCTL_H_ */
diff --git a/sys/kern/kern_sysctl.c b/sys/kern/kern_sysctl.c
new file mode 100644
index 0000000..970bc70
--- /dev/null
+++ b/sys/kern/kern_sysctl.c
@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * 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.
+ * 3. Neither the name of Hyra nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
+ */
+
+#include <sys/sysctl.h>
+#include <sys/errno.h>
+#include <vm/dynalloc.h>
+#include <string.h>
+
+#define HYRA_RELEASE "Hyra/" HYRA_ARCH " " \
+ HYRA_VERSION " " \
+ HYRA_BUILDDATE
+
+static const char *hyra = "Hyra";
+static const char *hyra_version = HYRA_VERSION;
+static const char *osrelease = HYRA_RELEASE;
+
+static struct sysctl_entry common_kerntab[] = {
+ [KERN_OSTYPE] = { KERN_OSTYPE, SYSCTL_OPTYPE_STR_RO, &hyra },
+ [KERN_OSRELEASE] = { KERN_OSRELEASE, SYSCTL_OPTYPE_STR, &osrelease },
+ [KERN_VERSION] = { KERN_VERSION, SYSCTL_OPTYPE_STR, &hyra_version },
+};
+
+int
+sysctl(struct sysctl_args *args)
+{
+ struct sysctl_entry *tmp;
+ char *tmp_str;
+ size_t oldlen, len;
+
+ if (args->name == NULL) {
+ return -EINVAL;
+ }
+
+ if (args->oldlenp == NULL) {
+ return -EINVAL;
+ }
+
+ /* TODO: Support writable values */
+ if (args->newp != NULL) {
+ return -ENOTSUP;
+ }
+
+ /*
+ * TODO: We only support toplevel names as of now and should
+ * expand this in the future. As of now, users will only
+ * be able to access kern.* entries.
+ */
+ switch (*args->name) {
+ case KERN_OSTYPE:
+ tmp = &common_kerntab[KERN_OSTYPE];
+ tmp_str = *((char **)tmp->data);
+ len = strlen(tmp_str);
+ break;
+ case KERN_OSRELEASE:
+ tmp = &common_kerntab[KERN_OSRELEASE];
+ tmp_str = *((char **)tmp->data);
+ len = strlen(tmp_str);
+ break;
+ case KERN_VERSION:
+ tmp = &common_kerntab[KERN_VERSION];
+ tmp_str = *((char **)tmp->data);
+ len = strlen(tmp_str);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* Copy new data */
+ oldlen = *args->oldlenp;
+ memcpy(args->oldp, tmp_str, oldlen);
+ return (len > oldlen) ? -ENOMEM : 0;
+}
--
cgit v1.2.3