/* Copyright (C) 1998 Joshua Sled
This file is part of LibGTop 1.0.
Contributed by Joshua Sled <jsled@xcf.berkeley.edu>, July 1998.
LibGTop is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
LibGTop is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with LibGTop; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include <config.h>
#include <glibtop.h>
#include <glibtop/error.h>
#include <glibtop/procmap.h>
#include <glibtop_suid.h>
#include <kvm.h>
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/resource.h>
#include <vm/vm_object.h>
#include <vm/vm_map.h>
#include <vm/vm.h>
#define _KVM_VNODE
#include <sys/vnode.h>
#undef _KVM_VNODE
#include <sys/conf.h>
#if (__FreeBSD_version >= 800038) || (__FreeBSD_kernel_version >= 800038)
#define _WANT_FILE
#include <sys/file.h>
#undef _WANT_FILE
#else
#define _KERNEL
#include <sys/file.h>
#undef _KERNEL
#endif
#define _KERNEL
#include <sys/mount.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <fs/devfs/devfs.h>
#if (__FreeBSD_version >= 600006) || defined(__FreeBSD_kernel__)
#include <fs/devfs/devfs_int.h>
#endif
#undef _KERNEL
#if (__FreeBSD_version >= 1101001)
#define _KERNEL
#include <ufs/ufs/extattr.h>
#include <ufs/ufs/ufsmount.h>
#undef _KERNEL
#endif
#include <sys/ucred.h>
#include <sys/sysctl.h>
static const unsigned long _glibtop_sysdeps_proc_map =
(1L << GLIBTOP_PROC_MAP_TOTAL) + (1L << GLIBTOP_PROC_MAP_NUMBER) +
(1L << GLIBTOP_PROC_MAP_SIZE);
static const unsigned long _glibtop_sysdeps_map_entry =
(1L << GLIBTOP_MAP_ENTRY_START) + (1L << GLIBTOP_MAP_ENTRY_END) +
(1L << GLIBTOP_MAP_ENTRY_OFFSET) + (1L << GLIBTOP_MAP_ENTRY_PERM) +
(1L << GLIBTOP_MAP_ENTRY_INODE) + (1L << GLIBTOP_MAP_ENTRY_DEVICE);
#if (__FreeBSD_version >= 600006) || defined(__FreeBSD_kernel__)
void _glibtop_sysdeps_freebsd_dev_inode (glibtop *server, struct vnode *vnode, struct vnode *vn, guint64 *inum, guint64 *dev);
void
_glibtop_sysdeps_freebsd_dev_inode (glibtop *server, struct vnode *vnode,
struct vnode *vn, guint64 *inum,
guint64 *dev)
{
char *tagptr;
char tagstr[12];
enum FS_TYPE { UNKNOWN, IS_UFS, IS_ZFS };
int fs_type = UNKNOWN;
struct inode inode;
struct cdev_priv priv;
#if __FreeBSD_version < 800039
struct cdev si;
#endif
*inum = 0;
*dev = 0;
if (kvm_read (server->machine->kd, (gulong) &vnode->v_tag,
(char *) &tagptr, sizeof (tagptr)) != sizeof (tagptr) ||
kvm_read (server->machine->kd, (gulong) tagptr,
(char *) tagstr, sizeof (tagstr)) != sizeof (tagstr))
{
glibtop_warn_io_r (server, "kvm_read (tagptr)");
return;
}
tagstr[sizeof(tagstr) - 1] = '\0';
if (!strcmp(tagstr, "ufs")) {
fs_type = IS_UFS;
} else if (!strcmp(tagstr, "zfs")) {
fs_type = IS_ZFS;
} else {
glibtop_warn_io_r (server, "ignoring fstype %s", tagstr);
return;
}
if (kvm_read (server->machine->kd, (gulong) VTOI(vn), (char *) &inode,
sizeof (inode)) != sizeof (inode))
{
glibtop_warn_io_r (server, "kvm_read (inode)");
return;
}
if (fs_type == IS_ZFS) {
/* FIXME: I have no idea about what is the actual layout of what we've read
but the inode number is definitely at offset 16, 8 bytes of amd64.
*inum = *(guint64*) ((unsigned char*)&inode + 16);
So this is really hugly, but I don't have anything better for now.
Actually, this looks like a znode_t as described in kernel's zfs_znode.h.
I don't have that header file, so let's just mimic that.
*/
struct my_zfsvfs {
/* vfs_t */ void *z_vfs;
/* zfsvfs_t */ void *z_parent;
/* objset_t */ void *z_os;
uint64_t z_root;
/* ... */
};
typedef struct my_znode {
struct my_zfsvfs *z_zfsvfs;
/* vnode_t */ void *z_vnode;
uint64_t z_id;
/* ... */
} my_znode_t;
G_STATIC_ASSERT(sizeof(my_znode_t) <= sizeof(struct inode));
my_znode_t* znode = (my_znode_t*)&inode;
*inum = znode->z_id;
struct my_zfsvfs zvfs;
if (kvm_read(server->machine->kd,
(unsigned long)(znode->z_zfsvfs),
&zvfs, sizeof zvfs) != sizeof zvfs) {
glibtop_warn_io_r(server, "kvm_read (z_zfsvfs)");
return;
}
*dev = zvfs.z_root;
}
else if (fs_type == IS_UFS) {
/* Set inum as soon as possible, so that if the next kvm_reads fail
we still have something */
*inum = inode.i_number;
#if (__FreeBSD_version >= 1101001)
/*
The ufs struct inode changed between 11.0 and 11.1.
commit 20f1e8ac63b58708989267ea34a6aefa90b46577
Author: kib <kib@FreeBSD.org>
Date: Sat Sep 17 16:47:34 2016 +0000
Reduce size of ufs inode.
[...]
*/
struct ufsmount um;
if (kvm_read(server->machine->kd, (gulong)inode.i_ump, &um, sizeof um) != sizeof um) {
glibtop_warn_io_r (server, "kvm_read (ufsmount)");
return;
}
if (kvm_read(server->machine->kd, (gulong)cdev2priv(um.um_dev), &priv, sizeof priv) != sizeof priv) {
glibtop_warn_io_r (server, "kvm_read (priv)");
return;
}
*dev = priv.cdp_inode;
#else /* older versions */
#if (__FreeBSD_version >= 800039) || (__FreeBSD_kernel_version >= 800039)
if (kvm_read (server->machine->kd, (gulong) cdev2priv(inode.i_dev), (char *) &priv,
sizeof (priv))
#else
if (kvm_read (server->machine->kd, (gulong) inode.i_dev, (char *) &si,
sizeof (si)) != sizeof (si) ||
kvm_read (server->machine->kd, (gulong) si.si_priv, (char *) &priv,
sizeof (priv))
#endif
!= sizeof (priv))
{
glibtop_warn_io_r (server, "kvm_read (priv)");
return;
}
*dev = (guint64) priv.cdp_inode;
#endif /* older versions */
} /* end-if IS_UFS */
}
#endif
/* Init function. */
void
_glibtop_init_proc_map_p (glibtop *server)
{
server->sysdeps.proc_map = _glibtop_sysdeps_proc_map;
}
/* Provides detailed information about a process. */
glibtop_map_entry *
glibtop_get_proc_map_p (glibtop *server, glibtop_proc_map *buf,
pid_t pid)
{
struct kinfo_proc *pinfo;
struct vm_map_entry entry, *first;
struct vmspace vmspace;
struct vm_object object;
GArray *maps;
struct vnode vnode;
int count;
int update = 0;
memset (buf, 0, sizeof (glibtop_proc_map));
/* It does not work for the swapper task. */
if (pid == 0) return NULL;
/*return (glibtop_map_entry*) g_array_free(maps, TRUE);*/
glibtop_suid_enter (server);
/* Get the process data */
pinfo = kvm_getprocs (server->machine->kd, KERN_PROC_PID, pid, &count);
if ((pinfo == NULL) || (count < 1)) {
glibtop_warn_io_r (server, "kvm_getprocs (%d)", pid);
glibtop_suid_leave (server);
return NULL;
}
/* Now we get the memory maps. */
if (kvm_read (server->machine->kd,
(gulong) pinfo [0].ki_vmspace,
(char *) &vmspace, sizeof (vmspace)) != sizeof (vmspace)) {
glibtop_warn_io_r (server, "kvm_read (vmspace)");
glibtop_suid_leave (server);
return NULL;
}
first = vmspace.vm_map.header.next;
if (kvm_read (server->machine->kd,
(gulong) vmspace.vm_map.header.next,
(char *) &entry, sizeof (entry)) != sizeof (entry)) {
glibtop_warn_io_r (server, "kvm_read (entry)");
glibtop_suid_leave (server);
return NULL;
}
/* Walk through the `vm_map_entry' list ... */
/* I tested this a few times with `mmap'; as soon as you write
* to the mmap'ed area, the object type changes from OBJT_VNODE
* to OBJT_DEFAULT so if seems this really works. */
maps = g_array_sized_new(FALSE, FALSE, sizeof(glibtop_map_entry),
vmspace.vm_map.nentries);
do {
glibtop_map_entry *mentry;
guint64 inum, dev;
guint len;
if (update) {
if (kvm_read (server->machine->kd,
(gulong) entry.next,
(char *) &entry, sizeof (entry)) != sizeof (entry)) {
glibtop_warn_io_r (server, "kvm_read (entry)");
continue;
}
} else {
update = 1;
}
if (entry.eflags & (MAP_ENTRY_IS_SUB_MAP))
continue;
if (!entry.object.vm_object)
continue;
/* We're only interested in `vm_object's */
if (kvm_read (server->machine->kd,
(gulong) entry.object.vm_object,
(char *) &object, sizeof (object)) != sizeof (object)) {
glibtop_warn_io_r (server, "kvm_read (object)");
continue;
}
/* If the object is of type vnode, add its size */
if (object.type != OBJT_VNODE)
continue;
if (!object.handle)
continue;
if (kvm_read (server->machine->kd,
(gulong) object.handle,
(char *) &vnode, sizeof (vnode)) != sizeof (vnode)) {
glibtop_warn_io_r (server, "kvm_read (vnode)");
continue;
}
switch (vnode.v_type) {
case VNON:
case VBAD:
continue;
default:
#if (__FreeBSD_version < 600006) && !defined(__FreeBSD_kernel__)
inum = vnode.v_cachedid;
dev = vnode.v_cachedfs;
#else
_glibtop_sysdeps_freebsd_dev_inode (server,
(struct vnode *) object.handle,
&vnode, &inum, &dev);
#endif
break;
}
len = maps->len;
g_array_set_size(maps, len + 1);
mentry = &g_array_index(maps, glibtop_map_entry, len);
memset (mentry, 0, sizeof (glibtop_map_entry));
mentry->flags = _glibtop_sysdeps_map_entry;
mentry->start = (guint64) entry.start;
mentry->end = (guint64) entry.end;
mentry->offset = (guint64) entry.offset;
mentry->device = (guint64) dev;
mentry->inode = (guint64) inum;
mentry->perm = (guint64) 0;
if (entry.protection & VM_PROT_READ)
mentry->perm |= GLIBTOP_MAP_PERM_READ;
if (entry.protection & VM_PROT_WRITE)
mentry->perm |= GLIBTOP_MAP_PERM_WRITE;
if (entry.protection & VM_PROT_EXECUTE)
mentry->perm |= GLIBTOP_MAP_PERM_EXECUTE;
} while (entry.next != first);
glibtop_suid_leave (server);
buf->flags = _glibtop_sysdeps_proc_map;
buf->number = (guint64) maps->len;
buf->size = (guint64) sizeof (glibtop_map_entry);
buf->total = (guint64) (buf->number * buf->size);
return (glibtop_map_entry*) g_array_free(maps, FALSE);
}