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/*
* Copyright (C) 2022 Tobias Nygren <tnn@NetBSD.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "common.h"
#include "machine.h"
#if defined(HASNCACHE) && defined(USE_LIB_RNMT)
# include <sys/rbtree.h>
# include <sys/vnode_impl.h>
# include <err.h>
/*
* rnmt.c - read NetBSD=>10-style red-black tree kernel name cache
*/
static int lnc_compare_nodes(void *, const void *, const void *);
static int lnc_compare_key(void *, const void *, const void *);
static rb_tree_t lnc_rbtree;
/* local name cache entry */
struct lnc {
struct rb_node lnc_tree; /* red-black tree */
KA_T lnc_vp; /* vnode address */
const struct lnc *lnc_plnc; /* parent lnc address */
int lnc_nlen; /* name length */
char lnc_name[NCHNAMLEN + 1]; /* name */
};
static const rb_tree_ops_t lnc_rbtree_ops = {
.rbto_compare_nodes = lnc_compare_nodes,
.rbto_compare_key = lnc_compare_key,
.rbto_node_offset = offsetof(struct lnc, lnc_tree),
.rbto_context = NULL};
static int lnc_compare_nodes(void *context, const void *node1,
const void *node2) {
const struct lnc *lnc1 = node1;
const struct lnc *lnc2 = node2;
if (lnc1->lnc_vp < lnc2->lnc_vp) {
return -1;
}
if (lnc1->lnc_vp > lnc2->lnc_vp) {
return 1;
}
return 0;
}
static int lnc_compare_key(void *context, const void *node, const void *key) {
const struct lnc *lnc = node;
const KA_T vp = (KA_T)key;
if (lnc->lnc_vp < vp) {
return -1;
}
if (lnc->lnc_vp > vp) {
return 1;
}
return 0;
}
static struct lnc *ncache_enter_local(KA_T vp, const struct lnc *plnc,
const struct namecache *nc) {
struct lnc *lnc;
lnc = malloc(sizeof(*lnc));
if (!lnc) {
errx(1, "can't allocate local name cache entry\n");
}
lnc->lnc_vp = vp;
lnc->lnc_plnc = plnc;
lnc->lnc_nlen = nc->nc_nlen;
memcpy(lnc->lnc_name, nc->nc_name, lnc->lnc_nlen);
lnc->lnc_name[lnc->lnc_nlen] = 0;
rb_tree_insert_node(&lnc_rbtree, lnc);
return lnc;
}
static int sanity_check_vnode_impl(const struct vnode_impl *vi) {
if (vi->vi_vnode.v_type >= VBAD)
return -1;
return 0;
}
static int sanity_check_namecache(const struct namecache *nc) {
if (nc->nc_vp == NULL)
return -1;
if (nc->nc_nlen > NCHNAMLEN)
return -1;
if (nc->nc_nlen == 1 && nc->nc_name[0] == '.')
return -1;
if (nc->nc_nlen == 2 && nc->nc_name[0] == '.' && nc->nc_name[1] == '.')
return -1;
return 0;
}
static void ncache_walk(struct lsof_context *ctx, KA_T ncp,
const struct lnc *plnc) {
struct l_nch *lc;
static struct vnode_impl vi;
static struct namecache nc;
struct lnc *lnc;
KA_T vp;
KA_T left, right;
if (kread(ctx, ncp, (char *)&nc, sizeof(nc))) {
return;
}
vp = (KA_T)nc.nc_vp;
if (kread(ctx, vp, (char *)&vi, sizeof(vi))) {
vi.vi_vnode.v_type = VBAD;
}
left = (KA_T)nc.nc_tree.rb_nodes[0];
right = (KA_T)nc.nc_tree.rb_nodes[1];
if (sanity_check_vnode_impl(&vi) == 0 && sanity_check_namecache(&nc) == 0) {
lnc = ncache_enter_local(vp, plnc, &nc);
if (vi.vi_vnode.v_type == VDIR && vi.vi_nc_tree.rbt_root != NULL) {
ncache_walk((KA_T)vi.vi_nc_tree.rbt_root, lnc);
}
}
if (left)
ncache_walk(left, plnc);
if (right)
ncache_walk(right, plnc);
}
void ncache_load(struct lsof_context *ctx) {
KA_T rootvnode_addr;
struct vnode_impl vi;
rootvnode_addr = (KA_T)0;
if (get_Nl_value("rootvnode", (struct drive_Nl *)NULL, &rootvnode_addr) <
0 ||
!rootvnode_addr ||
kread(ctx, (KA_T)rootvnode_addr, (char *)&rootvnode_addr,
sizeof(rootvnode_addr)) ||
kread(ctx, (KA_T)rootvnode_addr, (char *)&vi, sizeof(vi))) {
errx(1, "can't read rootvnode\n");
}
rb_tree_init(&lnc_rbtree, &lnc_rbtree_ops);
ncache_walk((KA_T)vi.vi_nc_tree.rbt_root, 0);
}
static void build_path(char **buf, size_t *remaining, const struct lnc *lnc) {
size_t len;
if (lnc == NULL)
return;
build_path(buf, remaining, lnc->lnc_plnc);
if (remaining == 0) {
return;
}
if (lnc->lnc_plnc != NULL) {
**buf = '/';
(*buf)++;
remaining--;
}
len = lnc->lnc_nlen;
if (*remaining < len)
len = *remaining;
memcpy(*buf, lnc->lnc_name, len);
*remaining -= len;
*buf += len;
}
char *ncache_lookup(char *buf, int blen, int *fp) {
const struct lnc *lnc;
char *p;
size_t remaining;
*fp = 0;
lnc = rb_tree_find_node(&lnc_rbtree, (void *)Lf->na);
if (lnc != NULL) {
p = buf;
remaining = blen;
build_path(&p, &remaining, lnc);
if (remaining == 0) {
buf[blen - 1] = 0;
} else {
*p = 0;
}
*fp = 1;
return buf;
}
return NULL;
}
#endif
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