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/* $OpenBSD: kvm_proc2.c,v 1.24 2014/07/08 23:31:22 deraadt Exp $ */
/* $NetBSD: kvm_proc.c,v 1.30 1999/03/24 05:50:50 mrg Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum.
*
* 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 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.
*/
/*-
* Copyright (c) 1994, 1995 Charles M. Hannum. All rights reserved.
* Copyright (c) 1989, 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software developed by the Computer Systems
* Engineering group at Lawrence Berkeley Laboratory under DARPA contract
* BG 91-66 and contributed to Berkeley.
*
* 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 University 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 REGENTS 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 REGENTS 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.
*/
/*
* Proc traversal interface for kvm. ps and w are (probably) the exclusive
* users of this code, so we've factored it out into a separate module.
* Thus, we keep this grunge out of the other kvm applications (i.e.,
* most other applications are interested only in open/close/read/nlist).
*/
#define __need_process
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/exec.h>
#include <sys/stat.h>
#include <sys/ucred.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/resource.h>
#include <sys/resourcevar.h>
#include <sys/signalvar.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <nlist.h>
#include <kvm.h>
#include <uvm/uvm_extern.h>
#include <uvm/uvm_amap.h>
#include <machine/vmparam.h>
#include <machine/pmap.h>
#include <sys/sysctl.h>
#include <limits.h>
#include <db.h>
#include <paths.h>
#include "kvm_private.h"
/*
* Read proc's from memory file into buffer bp, which has space to hold
* at most maxcnt procs.
*/
static int
kvm_proclist(kvm_t *kd, int op, int arg, struct process *pr,
char *bp, int maxcnt, size_t esize)
{
struct kinfo_proc kp;
struct session sess;
struct ucred ucred;
struct proc proc, proc2, *p;
struct process process, process2;
struct pgrp pgrp;
struct tty tty;
struct sigacts sa, *sap;
struct vmspace vm, *vmp;
struct plimit limits, *limp;
pid_t process_pid, parent_pid, leader_pid;
int cnt = 0;
int dothreads = 0;
dothreads = op & KERN_PROC_SHOW_THREADS;
op &= ~KERN_PROC_SHOW_THREADS;
/*
* Modelled on sysctl_doproc() in sys/kern/kern_sysctl.c
*/
for (; cnt < maxcnt && pr != NULL; pr = LIST_NEXT(&process, ps_list)) {
if (KREAD(kd, (u_long)pr, &process)) {
_kvm_err(kd, kd->program, "can't read process at %lx",
(u_long)pr);
return (-1);
}
if (process.ps_pgrp == NULL)
continue;
if (process.ps_flags & PS_EMBRYO)
continue;
if (KREAD(kd, (u_long)process.ps_mainproc, &proc)) {
_kvm_err(kd, kd->program, "can't read proc at %lx",
(u_long)process.ps_mainproc);
return (-1);
}
process_pid = proc.p_pid;
if (KREAD(kd, (u_long)process.ps_ucred, &ucred)) {
_kvm_err(kd, kd->program, "can't read ucred at %lx",
(u_long)process.ps_ucred);
return (-1);
}
if (KREAD(kd, (u_long)process.ps_pgrp, &pgrp)) {
_kvm_err(kd, kd->program, "can't read pgrp at %lx",
(u_long)process.ps_pgrp);
return (-1);
}
if (KREAD(kd, (u_long)pgrp.pg_session, &sess)) {
_kvm_err(kd, kd->program, "can't read session at %lx",
(u_long)pgrp.pg_session);
return (-1);
}
if ((process.ps_flags & PS_CONTROLT) && sess.s_ttyp != NULL &&
KREAD(kd, (u_long)sess.s_ttyp, &tty)) {
_kvm_err(kd, kd->program, "can't read tty at %lx",
(u_long)sess.s_ttyp);
return (-1);
}
if (process.ps_pptr) {
if (KREAD(kd, (u_long)process.ps_pptr, &process2)) {
_kvm_err(kd, kd->program,
"can't read process at %lx",
(u_long)process.ps_pptr);
return (-1);
}
if (KREAD(kd, (u_long)process2.ps_mainproc, &proc2)) {
_kvm_err(kd, kd->program,
"can't read proc at %lx",
(u_long)process2.ps_mainproc);
return (-1);
}
parent_pid = proc2.p_pid;
}
else
parent_pid = 0;
if (sess.s_leader) {
if (KREAD(kd, (u_long)sess.s_leader, &process2)) {
_kvm_err(kd, kd->program,
"can't read proc at %lx",
(u_long)sess.s_leader);
return (-1);
}
if (KREAD(kd, (u_long)process2.ps_mainproc, &proc2)) {
_kvm_err(kd, kd->program,
"can't read proc at %lx",
(u_long)process2.ps_mainproc);
return (-1);
}
leader_pid = proc2.p_pid;
}
else
leader_pid = 0;
if (process.ps_sigacts) {
if (KREAD(kd, (u_long)process.ps_sigacts, &sa)) {
_kvm_err(kd, kd->program,
"can't read sigacts at %lx",
(u_long)process.ps_sigacts);
return (-1);
}
sap = &sa;
}
else
sap = NULL;
switch (op) {
case KERN_PROC_PID:
if (parent_pid != (pid_t)arg)
continue;
break;
case KERN_PROC_PGRP:
if (pgrp.pg_id != (pid_t)arg)
continue;
break;
case KERN_PROC_SESSION:
if (sess.s_leader == NULL ||
leader_pid != (pid_t)arg)
continue;
break;
case KERN_PROC_TTY:
if ((process.ps_flags & PS_CONTROLT) == 0 ||
sess.s_ttyp == NULL ||
tty.t_dev != (dev_t)arg)
continue;
break;
case KERN_PROC_UID:
if (ucred.cr_uid != (uid_t)arg)
continue;
break;
case KERN_PROC_RUID:
if (ucred.cr_ruid != (uid_t)arg)
continue;
break;
case KERN_PROC_ALL:
if (proc.p_flag & P_SYSTEM)
continue;
break;
case KERN_PROC_KTHREAD:
/* no filtering */
break;
default:
_kvm_err(kd, kd->program, "invalid filter");
return (-1);
}
/*
* We're going to add another proc to the set. If this
* will overflow the buffer, assume the reason is because
* nthreads (or the proc list) is corrupt and declare an error.
*/
if (cnt >= maxcnt) {
_kvm_err(kd, kd->program, "nthreads corrupt");
return (-1);
}
/* set up stuff that might not always be there */
limp = &limits;
if (!process.ps_limit ||
KREAD(kd, (u_long)process.ps_limit, &limits))
limp = NULL;
vmp = NULL;
if ((process.ps_flags & PS_ZOMBIE) == 0 &&
!KREAD(kd, (u_long)process.ps_vmspace, &vm))
vmp = &vm;
#define do_copy_str(_d, _s, _l) kvm_read(kd, (u_long)(_s), (_d), (_l)-1)
FILL_KPROC(&kp, do_copy_str, &proc, &process,
&ucred, &pgrp, process.ps_mainproc, proc.p_p, &sess,
vmp, limp, sap, 0, 1);
/* stuff that's too painful to generalize */
kp.p_pid = process_pid;
kp.p_ppid = parent_pid;
kp.p_sid = leader_pid;
if ((process.ps_flags & PS_CONTROLT) && sess.s_ttyp != NULL) {
kp.p_tdev = tty.t_dev;
if (tty.t_pgrp != NULL &&
tty.t_pgrp != process.ps_pgrp &&
KREAD(kd, (u_long)tty.t_pgrp, &pgrp)) {
_kvm_err(kd, kd->program,
"can't read tpgrp at %lx",
(u_long)tty.t_pgrp);
return (-1);
}
kp.p_tpgid = tty.t_pgrp ? pgrp.pg_id : -1;
kp.p_tsess = PTRTOINT64(tty.t_session);
} else {
kp.p_tpgid = -1;
kp.p_tdev = NODEV;
}
/* update %cpu for all threads */
if (dothreads) {
kp.p_pctcpu = proc.p_pctcpu;
kp.p_stat = proc.p_stat;
} else {
kp.p_pctcpu = 0;
kp.p_stat = (process.ps_flags & PS_ZOMBIE) ? SDEAD :
SIDL;
for (p = TAILQ_FIRST(&process.ps_threads); p != NULL;
p = TAILQ_NEXT(&proc, p_thr_link)) {
if (KREAD(kd, (u_long)p, &proc)) {
_kvm_err(kd, kd->program,
"can't read proc at %lx",
(u_long)p);
return (-1);
}
kp.p_pctcpu += proc.p_pctcpu;
/*
* find best state:
* ONPROC > RUN > STOP > SLEEP > ...
*/
if (proc.p_stat == SONPROC ||
kp.p_stat == SONPROC)
kp.p_stat = SONPROC;
else if (proc.p_stat == SRUN ||
kp.p_stat == SRUN)
kp.p_stat = SRUN;
else if (proc.p_stat == SSTOP ||
kp.p_stat == SSTOP)
kp.p_stat = SSTOP;
else if (proc.p_stat == SSLEEP)
kp.p_stat = SSLEEP;
}
}
memcpy(bp, &kp, esize);
bp += esize;
++cnt;
/* Skip per-thread entries if not required by op */
if (!dothreads)
continue;
for (p = TAILQ_FIRST(&process.ps_threads); p != NULL;
p = TAILQ_NEXT(&proc, p_thr_link)) {
if (KREAD(kd, (u_long)p, &proc)) {
_kvm_err(kd, kd->program,
"can't read proc at %lx",
(u_long)p);
return (-1);
}
FILL_KPROC(&kp, do_copy_str, &proc, &process,
&ucred, &pgrp, p, proc.p_p, &sess, vmp, limp, sap,
1, 1);
/* see above */
kp.p_pid = process_pid;
kp.p_ppid = parent_pid;
kp.p_sid = leader_pid;
if ((process.ps_flags & PS_CONTROLT) &&
sess.s_ttyp != NULL) {
kp.p_tdev = tty.t_dev;
if (tty.t_pgrp != NULL &&
tty.t_pgrp != process.ps_pgrp &&
KREAD(kd, (u_long)tty.t_pgrp, &pgrp)) {
_kvm_err(kd, kd->program,
"can't read tpgrp at %lx",
(u_long)tty.t_pgrp);
return (-1);
}
kp.p_tpgid = tty.t_pgrp ? pgrp.pg_id : -1;
kp.p_tsess = PTRTOINT64(tty.t_session);
} else {
kp.p_tpgid = -1;
kp.p_tdev = NODEV;
}
}
memcpy(bp, &kp, esize);
bp += esize;
++cnt;
#undef do_copy_str
}
return (cnt);
}
struct kinfo_proc *
kvm_getprocs(kvm_t *kd, int op, int arg, size_t esize, int *cnt)
{
int mib[6], st, nthreads;
size_t size;
if ((ssize_t)esize < 0)
return (NULL);
if (kd->procbase != NULL) {
free(kd->procbase);
/*
* Clear this pointer in case this call fails. Otherwise,
* kvm_close() will free it again.
*/
kd->procbase = 0;
}
if (ISALIVE(kd)) {
size = 0;
mib[0] = CTL_KERN;
mib[1] = KERN_PROC;
mib[2] = op;
mib[3] = arg;
mib[4] = esize;
mib[5] = 0;
st = sysctl(mib, 6, NULL, &size, NULL, 0);
if (st == -1) {
_kvm_syserr(kd, kd->program, "kvm_getprocs");
return (NULL);
}
mib[5] = size / esize;
kd->procbase = _kvm_malloc(kd, size);
if (kd->procbase == 0)
return (NULL);
st = sysctl(mib, 6, kd->procbase, &size, NULL, 0);
if (st == -1) {
_kvm_syserr(kd, kd->program, "kvm_getprocs");
return (NULL);
}
nthreads = size / esize;
} else {
struct nlist nl[5];
int i, maxthread, maxprocess;
struct process *pr;
char *bp;
if (esize > sizeof(struct kinfo_proc)) {
_kvm_syserr(kd, kd->program,
"kvm_getprocs: unknown fields requested: libkvm out of date?");
return (NULL);
}
memset(nl, 0, sizeof(nl));
nl[0].n_name = "_nthreads";
nl[1].n_name = "_nprocesses";
nl[2].n_name = "_allprocess";
nl[3].n_name = "_zombprocess";
nl[4].n_name = NULL;
if (kvm_nlist(kd, nl) != 0) {
for (i = 0; nl[i].n_type != 0; ++i)
;
_kvm_err(kd, kd->program,
"%s: no such symbol", nl[i].n_name);
return (NULL);
}
if (KREAD(kd, nl[0].n_value, &maxthread)) {
_kvm_err(kd, kd->program, "can't read nthreads");
return (NULL);
}
if (KREAD(kd, nl[1].n_value, &maxprocess)) {
_kvm_err(kd, kd->program, "can't read nprocesses");
return (NULL);
}
maxthread += maxprocess;
kd->procbase = _kvm_malloc(kd, maxthread * esize);
if (kd->procbase == 0)
return (NULL);
bp = (char *)kd->procbase;
/* allprocess */
if (KREAD(kd, nl[2].n_value, &pr)) {
_kvm_err(kd, kd->program, "cannot read allprocess");
return (NULL);
}
nthreads = kvm_proclist(kd, op, arg, pr, bp, maxthread, esize);
if (nthreads < 0)
return (NULL);
/* zombprocess */
if (KREAD(kd, nl[3].n_value, &pr)) {
_kvm_err(kd, kd->program, "cannot read zombprocess");
return (NULL);
}
i = kvm_proclist(kd, op, arg, pr, bp + (esize * nthreads),
maxthread - nthreads, esize);
if (i > 0)
nthreads += i;
}
if (kd->procbase != NULL)
*cnt = nthreads;
return (kd->procbase);
}
|