604 lines
15 KiB
C
604 lines
15 KiB
C
/* $NetBSD: sysctlgetmibinfo.c,v 1.5 2005/06/12 05:21:27 lukem Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2003,2004 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Andrew Brown.
|
|
*
|
|
* 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 The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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/cdefs.h>
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
__RCSID("$NetBSD: sysctlgetmibinfo.c,v 1.5 2005/06/12 05:21:27 lukem Exp $");
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
#include "namespace.h"
|
|
#ifdef _REENTRANT
|
|
#include "reentrant.h"
|
|
#endif /* _REENTRANT */
|
|
#include <sys/param.h>
|
|
#include <sys/sysctl.h>
|
|
|
|
#include <errno.h>
|
|
#include <inttypes.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#ifdef __weak_alias
|
|
__weak_alias(__learn_tree,___learn_tree)
|
|
__weak_alias(sysctlgetmibinfo,_sysctlgetmibinfo)
|
|
#endif
|
|
|
|
/*
|
|
* the place where we attach stuff we learn on the fly, not
|
|
* necessarily used.
|
|
*/
|
|
static struct sysctlnode sysctl_mibroot = {
|
|
#if defined(lint)
|
|
/*
|
|
* lint doesn't like my initializers
|
|
*/
|
|
0
|
|
#else /* !lint */
|
|
.sysctl_flags = SYSCTL_VERSION|CTLFLAG_ROOT|CTLTYPE_NODE,
|
|
sysc_init_field(_sysctl_size, sizeof(struct sysctlnode)),
|
|
.sysctl_name = "(root)",
|
|
#endif /* !lint */
|
|
};
|
|
|
|
/*
|
|
* routines to handle learning and cleanup
|
|
*/
|
|
static int compar(const void *, const void *);
|
|
static void free_children(struct sysctlnode *);
|
|
static void relearnhead(void);
|
|
|
|
/*
|
|
* specifically not static since sysctl(8) "borrows" it.
|
|
*/
|
|
int __learn_tree(int *, u_int, struct sysctlnode *);
|
|
|
|
/*
|
|
* for ordering nodes -- a query may or may not be given them in
|
|
* numeric order
|
|
*/
|
|
static int
|
|
compar(const void *a, const void *b)
|
|
{
|
|
|
|
return (((const struct sysctlnode *)a)->sysctl_num -
|
|
((const struct sysctlnode *)b)->sysctl_num);
|
|
}
|
|
|
|
/*
|
|
* recursively nukes a branch or an entire tree from the given node
|
|
*/
|
|
static void
|
|
free_children(struct sysctlnode *rnode)
|
|
{
|
|
struct sysctlnode *node;
|
|
|
|
if (rnode == NULL ||
|
|
SYSCTL_TYPE(rnode->sysctl_flags) != CTLTYPE_NODE ||
|
|
rnode->sysctl_child == NULL)
|
|
return;
|
|
|
|
for (node = rnode->sysctl_child;
|
|
node < &rnode->sysctl_child[rnode->sysctl_clen];
|
|
node++) {
|
|
free_children(node);
|
|
}
|
|
free(rnode->sysctl_child);
|
|
rnode->sysctl_child = NULL;
|
|
}
|
|
|
|
/*
|
|
* verifies that the head of the tree in the kernel is the same as the
|
|
* head of the tree we already got, integrating new stuff and removing
|
|
* old stuff, if it's not.
|
|
*/
|
|
static void
|
|
relearnhead(void)
|
|
{
|
|
struct sysctlnode *h, *i, *o, qnode;
|
|
size_t si, so;
|
|
int rc, name, nlen, olen, ni, oi, t;
|
|
|
|
/*
|
|
* if there's nothing there, there's no need to expend any
|
|
* effort
|
|
*/
|
|
if (sysctl_mibroot.sysctl_child == NULL)
|
|
return;
|
|
|
|
/*
|
|
* attempt to pull out the head of the tree, starting with the
|
|
* size we have now, and looping if we need more (or less)
|
|
* space
|
|
*/
|
|
si = 0;
|
|
so = sysctl_mibroot.sysctl_clen * sizeof(struct sysctlnode);
|
|
name = CTL_QUERY;
|
|
memset(&qnode, 0, sizeof(qnode));
|
|
qnode.sysctl_flags = SYSCTL_VERSION;
|
|
do {
|
|
si = so;
|
|
h = malloc(si);
|
|
rc = sysctl(&name, 1, h, &so, &qnode, sizeof(qnode));
|
|
if (rc == -1 && errno != ENOMEM)
|
|
return;
|
|
if (si < so)
|
|
free(h);
|
|
} while (si < so);
|
|
|
|
/*
|
|
* order the new copy of the head
|
|
*/
|
|
nlen = so / sizeof(struct sysctlnode);
|
|
qsort(h, (size_t)nlen, sizeof(struct sysctlnode), compar);
|
|
|
|
/*
|
|
* verify that everything is the same. if it is, we don't
|
|
* need to do any more work here.
|
|
*/
|
|
olen = sysctl_mibroot.sysctl_clen;
|
|
rc = (nlen == olen) ? 0 : 1;
|
|
o = sysctl_mibroot.sysctl_child;
|
|
for (ni = 0; rc == 0 && ni < nlen; ni++) {
|
|
if (h[ni].sysctl_num != o[ni].sysctl_num ||
|
|
h[ni].sysctl_ver != o[ni].sysctl_ver)
|
|
rc = 1;
|
|
}
|
|
if (rc == 0) {
|
|
free(h);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* something changed. h will become the new head, and we need
|
|
* pull over any subtrees we already have if they're the same
|
|
* version.
|
|
*/
|
|
i = h;
|
|
ni = oi = 0;
|
|
while (ni < nlen && oi < olen) {
|
|
/*
|
|
* something was inserted or deleted
|
|
*/
|
|
if (SYSCTL_TYPE(i[ni].sysctl_flags) == CTLTYPE_NODE)
|
|
i[ni].sysctl_child = NULL;
|
|
if (i[ni].sysctl_num != o[oi].sysctl_num) {
|
|
if (i[ni].sysctl_num < o[oi].sysctl_num) {
|
|
ni++;
|
|
}
|
|
else {
|
|
free_children(&o[oi]);
|
|
oi++;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* same number, but different version, so throw away
|
|
* any accumulated children
|
|
*/
|
|
if (i[ni].sysctl_ver != o[oi].sysctl_ver)
|
|
free_children(&o[oi]);
|
|
|
|
/*
|
|
* this node is the same, but we only need to
|
|
* move subtrees.
|
|
*/
|
|
else if (SYSCTL_TYPE(i[ni].sysctl_flags) == CTLTYPE_NODE) {
|
|
/*
|
|
* move subtree to new parent
|
|
*/
|
|
i[ni].sysctl_clen = o[oi].sysctl_clen;
|
|
i[ni].sysctl_csize = o[oi].sysctl_csize;
|
|
i[ni].sysctl_child = o[oi].sysctl_child;
|
|
/*
|
|
* reparent inherited subtree
|
|
*/
|
|
for (t = 0;
|
|
i[ni].sysctl_child != NULL &&
|
|
t < i[ni].sysctl_clen;
|
|
t++)
|
|
i[ni].sysctl_child[t].sysctl_parent = &i[ni];
|
|
}
|
|
ni++;
|
|
oi++;
|
|
}
|
|
|
|
/*
|
|
* left over new nodes need to have empty subtrees cleared
|
|
*/
|
|
while (ni < nlen) {
|
|
if (SYSCTL_TYPE(i[ni].sysctl_flags) == CTLTYPE_NODE)
|
|
i[ni].sysctl_child = NULL;
|
|
ni++;
|
|
}
|
|
|
|
/*
|
|
* left over old nodes need to be cleaned out
|
|
*/
|
|
while (oi < olen) {
|
|
free_children(&o[oi]);
|
|
oi++;
|
|
}
|
|
|
|
/*
|
|
* pop new head in
|
|
*/
|
|
sysctl_mibroot.sysctl_clen = nlen;
|
|
sysctl_mibroot.sysctl_csize = nlen;
|
|
sysctl_mibroot.sysctl_child = h;
|
|
free(o);
|
|
}
|
|
|
|
/*
|
|
* sucks in the children at a given level and attaches it to the tree.
|
|
*/
|
|
int
|
|
__learn_tree(int *name, u_int namelen, struct sysctlnode *pnode)
|
|
{
|
|
struct sysctlnode qnode;
|
|
int rc;
|
|
size_t sz;
|
|
|
|
if (pnode == NULL)
|
|
pnode = &sysctl_mibroot;
|
|
if (SYSCTL_TYPE(pnode->sysctl_flags) != CTLTYPE_NODE) {
|
|
errno = EINVAL;
|
|
return (-1);
|
|
}
|
|
if (pnode->sysctl_child != NULL)
|
|
return (0);
|
|
|
|
if (pnode->sysctl_clen == 0)
|
|
sz = SYSCTL_DEFSIZE * sizeof(struct sysctlnode);
|
|
else
|
|
sz = pnode->sysctl_clen * sizeof(struct sysctlnode);
|
|
pnode->sysctl_child = malloc(sz);
|
|
if (pnode->sysctl_child == NULL)
|
|
return (-1);
|
|
|
|
name[namelen] = CTL_QUERY;
|
|
pnode->sysctl_clen = 0;
|
|
pnode->sysctl_csize = 0;
|
|
memset(&qnode, 0, sizeof(qnode));
|
|
qnode.sysctl_flags = SYSCTL_VERSION;
|
|
rc = sysctl(name, namelen + 1, pnode->sysctl_child, &sz,
|
|
&qnode, sizeof(qnode));
|
|
if (sz == 0) {
|
|
free(pnode->sysctl_child);
|
|
pnode->sysctl_child = NULL;
|
|
return (rc);
|
|
}
|
|
if (rc) {
|
|
free(pnode->sysctl_child);
|
|
pnode->sysctl_child = NULL;
|
|
if ((sz % sizeof(struct sysctlnode)) != 0)
|
|
errno = EINVAL;
|
|
if (errno != ENOMEM)
|
|
return (rc);
|
|
}
|
|
|
|
if (pnode->sysctl_child == NULL) {
|
|
pnode->sysctl_child = malloc(sz);
|
|
if (pnode->sysctl_child == NULL)
|
|
return (-1);
|
|
|
|
rc = sysctl(name, namelen + 1, pnode->sysctl_child, &sz,
|
|
&qnode, sizeof(qnode));
|
|
if (rc) {
|
|
free(pnode->sysctl_child);
|
|
pnode->sysctl_child = NULL;
|
|
return (rc);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* how many did we get?
|
|
*/
|
|
pnode->sysctl_clen = sz / sizeof(struct sysctlnode);
|
|
pnode->sysctl_csize = sz / sizeof(struct sysctlnode);
|
|
if (pnode->sysctl_clen * sizeof(struct sysctlnode) != sz) {
|
|
free(pnode->sysctl_child);
|
|
pnode->sysctl_child = NULL;
|
|
errno = EINVAL;
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* you know, the kernel doesn't really keep them in any
|
|
* particular order...just like entries in a directory
|
|
*/
|
|
qsort(pnode->sysctl_child, pnode->sysctl_clen,
|
|
sizeof(struct sysctlnode), compar);
|
|
|
|
/*
|
|
* rearrange parent<->child linkage
|
|
*/
|
|
for (rc = 0; rc < pnode->sysctl_clen; rc++) {
|
|
pnode->sysctl_child[rc].sysctl_parent = pnode;
|
|
if (SYSCTL_TYPE(pnode->sysctl_child[rc].sysctl_flags) ==
|
|
CTLTYPE_NODE) {
|
|
/*
|
|
* these nodes may have children, but we
|
|
* haven't discovered that yet.
|
|
*/
|
|
pnode->sysctl_child[rc].sysctl_child = NULL;
|
|
}
|
|
pnode->sysctl_child[rc].sysctl_desc = NULL;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* that's "given name" as a string, the integer form of the name fit
|
|
* to be passed to sysctl(), "canonicalized name" (optional), and a
|
|
* pointer to the length of the integer form. oh, and then a pointer
|
|
* to the node, in case you (the caller) care. you can leave them all
|
|
* NULL except for gname, though that might be rather pointless,
|
|
* unless all you wanna do is verify that a given name is acceptable.
|
|
*
|
|
* returns either 0 (everything was fine) or -1 and sets errno
|
|
* accordingly. if errno is set to EAGAIN, we detected a change to
|
|
* the mib while parsing, and you should try again. in the case of an
|
|
* invalid node name, cname will be set to contain the offending name.
|
|
*/
|
|
#ifdef _REENTRANT
|
|
static mutex_t sysctl_mutex = MUTEX_INITIALIZER;
|
|
static int sysctlgetmibinfo_unlocked(const char *, int *, u_int *, char *,
|
|
size_t *, struct sysctlnode **, int);
|
|
#endif /* __REENTRANT */
|
|
|
|
int
|
|
sysctlgetmibinfo(const char *gname, int *iname, u_int *namelenp,
|
|
char *cname, size_t *csz, struct sysctlnode **rnode, int v)
|
|
#ifdef _REENTRANT
|
|
{
|
|
int rc;
|
|
|
|
mutex_lock(&sysctl_mutex);
|
|
rc = sysctlgetmibinfo_unlocked(gname, iname, namelenp, cname, csz,
|
|
rnode, v);
|
|
mutex_unlock(&sysctl_mutex);
|
|
|
|
return (rc);
|
|
}
|
|
|
|
static int
|
|
sysctlgetmibinfo_unlocked(const char *gname, int *iname, u_int *namelenp,
|
|
char *cname, size_t *csz, struct sysctlnode **rnode,
|
|
int v)
|
|
#endif /* _REENTRANT */
|
|
{
|
|
struct sysctlnode *pnode, *node;
|
|
int name[CTL_MAXNAME], ni, n, haven;
|
|
u_int nl;
|
|
intmax_t q;
|
|
char sep[2], token[SYSCTL_NAMELEN],
|
|
pname[SYSCTL_NAMELEN * CTL_MAXNAME + CTL_MAXNAME];
|
|
const char *piece, *dot;
|
|
char *t;
|
|
size_t l;
|
|
|
|
if (rnode != NULL) {
|
|
if (*rnode == NULL) {
|
|
/* XXX later deal with dealing back a sub version */
|
|
if (v != SYSCTL_VERSION)
|
|
return (EINVAL);
|
|
|
|
pnode = &sysctl_mibroot;
|
|
}
|
|
else {
|
|
/* this is just someone being silly */
|
|
if (SYSCTL_VERS((*rnode)->sysctl_flags) != v)
|
|
return (EINVAL);
|
|
|
|
/* XXX later deal with other people's trees */
|
|
if (SYSCTL_VERS((*rnode)->sysctl_flags) !=
|
|
SYSCTL_VERSION)
|
|
return (EINVAL);
|
|
|
|
pnode = *rnode;
|
|
}
|
|
}
|
|
else
|
|
pnode = &sysctl_mibroot;
|
|
|
|
if (pnode == &sysctl_mibroot)
|
|
relearnhead();
|
|
|
|
nl = ni = 0;
|
|
token[0] = '\0';
|
|
pname[0] = '\0';
|
|
node = NULL;
|
|
|
|
/*
|
|
* default to using '.' as the separator, but allow '/' as
|
|
* well, and then allow a leading separator
|
|
*/
|
|
if ((dot = strpbrk(gname, "./")) == NULL)
|
|
sep[0] = '.';
|
|
else
|
|
sep[0] = dot[0];
|
|
sep[1] = '\0';
|
|
if (gname[0] == sep[0]) {
|
|
strlcat(pname, sep, sizeof(pname));
|
|
gname++;
|
|
}
|
|
|
|
#define COPY_OUT_DATA(t, c, cs, nlp, l) do { \
|
|
if ((c) != NULL && (cs) != NULL) \
|
|
*(cs) = strlcpy((c), (t), *(cs)); \
|
|
else if ((cs) != NULL) \
|
|
*(cs) = strlen(t) + 1; \
|
|
if ((nlp) != NULL) \
|
|
*(nlp) = (l); \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
piece = gname;
|
|
while (piece != NULL && *piece != '\0') {
|
|
/*
|
|
* what was i looking for?
|
|
*/
|
|
dot = strchr(piece, sep[0]);
|
|
if (dot == NULL) {
|
|
l = strlcpy(token, piece, sizeof(token));
|
|
if (l > sizeof(token)) {
|
|
COPY_OUT_DATA(piece, cname, csz, namelenp, nl);
|
|
errno = ENAMETOOLONG;
|
|
return (-1);
|
|
}
|
|
}
|
|
else if (dot - piece > sizeof(token) - 1) {
|
|
COPY_OUT_DATA(token, cname, csz, namelenp, nl);
|
|
errno = ENAMETOOLONG;
|
|
return (-1);
|
|
}
|
|
else {
|
|
strncpy(token, piece, (size_t)(dot - piece));
|
|
token[dot - piece] = '\0';
|
|
}
|
|
|
|
/*
|
|
* i wonder if this "token" is an integer?
|
|
*/
|
|
errno = 0;
|
|
q = strtoimax(token, &t, 0);
|
|
n = (int)q;
|
|
if (errno != 0 || *t != '\0')
|
|
haven = 0;
|
|
else if (q < INT_MIN || q > UINT_MAX)
|
|
haven = 0;
|
|
else
|
|
haven = 1;
|
|
|
|
/*
|
|
* make sure i have something to look at
|
|
*/
|
|
if (SYSCTL_TYPE(pnode->sysctl_flags) != CTLTYPE_NODE) {
|
|
if (haven && nl > 0) {
|
|
strlcat(pname, sep, sizeof(pname));
|
|
goto just_numbers;
|
|
}
|
|
COPY_OUT_DATA(token, cname, csz, namelenp, nl);
|
|
errno = ENOTDIR;
|
|
return (-1);
|
|
}
|
|
if (pnode->sysctl_child == NULL) {
|
|
if (__learn_tree(name, nl, pnode) == -1) {
|
|
COPY_OUT_DATA(token, cname, csz, namelenp, nl);
|
|
return (-1);
|
|
}
|
|
}
|
|
node = pnode->sysctl_child;
|
|
if (node == NULL) {
|
|
COPY_OUT_DATA(token, cname, csz, namelenp, nl);
|
|
errno = ENOENT;
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* now...is it there?
|
|
*/
|
|
for (ni = 0; ni < pnode->sysctl_clen; ni++)
|
|
if ((haven && ((n == node[ni].sysctl_num) ||
|
|
(node[ni].sysctl_flags & CTLFLAG_ANYNUMBER))) ||
|
|
strcmp(token, node[ni].sysctl_name) == 0)
|
|
break;
|
|
if (ni >= pnode->sysctl_clen) {
|
|
COPY_OUT_DATA(token, cname, csz, namelenp, nl);
|
|
errno = ENOENT;
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* ah...it is.
|
|
*/
|
|
pnode = &node[ni];
|
|
if (nl > 0)
|
|
strlcat(pname, sep, sizeof(pname));
|
|
if (haven && n != pnode->sysctl_num) {
|
|
just_numbers:
|
|
strlcat(pname, token, sizeof(pname));
|
|
name[nl] = n;
|
|
}
|
|
else {
|
|
strlcat(pname, pnode->sysctl_name, sizeof(pname));
|
|
name[nl] = pnode->sysctl_num;
|
|
}
|
|
piece = (dot != NULL) ? dot + 1 : NULL;
|
|
nl++;
|
|
if (nl == CTL_MAXNAME) {
|
|
COPY_OUT_DATA(token, cname, csz, namelenp, nl);
|
|
errno = ERANGE;
|
|
return (-1);
|
|
}
|
|
}
|
|
|
|
if (nl == 0) {
|
|
if (namelenp != NULL)
|
|
*namelenp = 0;
|
|
errno = EINVAL;
|
|
return (-1);
|
|
}
|
|
|
|
COPY_OUT_DATA(pname, cname, csz, namelenp, nl);
|
|
if (iname != NULL && namelenp != NULL)
|
|
memcpy(iname, &name[0], MIN(nl, *namelenp) * sizeof(int));
|
|
if (namelenp != NULL)
|
|
*namelenp = nl;
|
|
if (rnode != NULL) {
|
|
if (*rnode != NULL)
|
|
/*
|
|
* they gave us a private tree to work in, so
|
|
* we give back a pointer into that private
|
|
* tree
|
|
*/
|
|
*rnode = pnode;
|
|
else {
|
|
/*
|
|
* they gave us a place to put the node data,
|
|
* so give them a copy
|
|
*/
|
|
*rnode = malloc(sizeof(struct sysctlnode));
|
|
if (*rnode != NULL) {
|
|
**rnode = *pnode;
|
|
(*rnode)->sysctl_child = NULL;
|
|
(*rnode)->sysctl_parent = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|