xref: /src/sys/miscfs/procfs/procfs_status.c

/*	$NetBSD: procfs_status.c,v 1.40 2020/05/23 23:42:43 ad Exp $	*/

/*
 * Copyright (c) 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Jan-Simon Pendry.
 *
 * 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.
 *
 *	@(#)procfs_status.c	8.4 (Berkeley) 6/15/94
 */

/*
 * Copyright (c) 1993 Jan-Simon Pendry
 *
 * This code is derived from software contributed to Berkeley by
 * Jan-Simon Pendry.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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.
 *
 *	@(#)procfs_status.c	8.4 (Berkeley) 6/15/94
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: procfs_status.c,v 1.40 2020/05/23 23:42:43 ad Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/resource.h>
#include <sys/resourcevar.h>
#include <sys/kauth.h>

#include <miscfs/procfs/procfs.h>

static int
procfs_status_netbsd(struct lwp *l, struct uio *uio)
{
	struct session *sess;
	struct tty *tp;
	kauth_cred_t cr;
	struct proc *p = l->l_proc;
	char *ps;
	const char *sep;
	const char *emulname = curlwp->l_proc->p_emul->e_name;
	int pid, ppid, pgid, sid;
	u_int i;
	char psbuf[256+MAXHOSTNAMELEN];		/* XXX - conservative */
	uint16_t ngroups;


	mutex_enter(&proc_lock);
	mutex_enter(p->p_lock);

	pid = p->p_pid;
	ppid = p->p_ppid;
	pgid = p->p_pgrp->pg_id;
	sess = p->p_pgrp->pg_session;
	sid = sess->s_sid;

	ps = psbuf;
	if (strncmp(emulname, "linux", 5) == 0) {
		ps += snprintf(ps, sizeof(psbuf), "Name:\t%s\n", p->p_comm);
		ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf), "Pid:\t%d\n", pid);
		ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf), "PPid:\t%d\n", ppid);
		ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf), "TracerPid:\t%d\n", 0);

		cr = p->p_cred;
		ngroups = kauth_cred_ngroups(cr);
		ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf), "Groups:\t");
		for (i = 0; i < ngroups; i++)
			ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf), "%d ",
			    kauth_cred_group(cr, i));
		ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf), "\n");

		ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf),
		    "VmPeak:\t%8ju kB\n", (intmax_t)p->p_rlimit[RLIMIT_DATA].rlim_cur / 1024);
		ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf),
		    "VmSize:\t%8ju kB\n", (intmax_t)p->p_rlimit[RLIMIT_DATA].rlim_cur / 1024);
		ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf),
		    "VmRSS:\t%8ju kB\n", (intmax_t)p->p_rlimit[RLIMIT_RSS].rlim_cur / 1024);

	} else {
/* comm pid ppid pgid sid maj,min ctty,sldr start ut st wmsg uid gid groups ... */

		memcpy(ps, p->p_comm, MAXCOMLEN);
		ps[MAXCOMLEN] = '\0';
		ps += strlen(ps);
		ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf), " %d %d %d %d ",
		    pid, ppid, pgid, sid);

		if ((p->p_lflag & PL_CONTROLT) && (tp = sess->s_ttyp))
			ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf), "%llu,%llu ",
			    (unsigned long long)major(tp->t_dev),
			    (unsigned long long)minor(tp->t_dev));
		else
			ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf), "%d,%d ",
			    -1, -1);

		sep = "";
		if (sess->s_ttyvp) {
			ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf), "%sctty", sep);
			sep = ",";
		}
		if (SESS_LEADER(p)) {
			ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf), "%ssldr", sep);
			sep = ",";
		}
		if (*sep != ',')
			ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf), "noflags");

		ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf), " %lld,%ld",
		    (long long)p->p_stats->p_start.tv_sec,
		    (long)p->p_stats->p_start.tv_usec);

		{
			struct timeval ut, st;

			calcru(p, &ut, &st, (void *) 0, NULL);
			ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf),
			    " %lld,%ld %lld,%ld", (long long)ut.tv_sec,
			    (long)ut.tv_usec, (long long)st.tv_sec, (long)st.tv_usec);
		}

		lwp_lock(l);
		ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf), " %s",
		    (l->l_wchan && l->l_wmesg) ? l->l_wmesg : "nochan");
		lwp_unlock(l);

		cr = p->p_cred;

		ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf), " %d",
		    kauth_cred_geteuid(cr));
		ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf), " %d",
		    kauth_cred_getegid(cr));
		ngroups = kauth_cred_ngroups(cr);
		for (i = 0; i < ngroups; i++)
			ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf), ",%d",
			    kauth_cred_group(cr, i));
		ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf), "\n");
	}
	mutex_exit(p->p_lock);
	mutex_exit(&proc_lock);

	return (uiomove_frombuf(psbuf, ps - psbuf, uio));
}

static int
procfs_status_linux(struct lwp *l, struct uio *uio)
{
	kauth_cred_t cr;
	struct proc *p = l->l_proc;
	char *ps;
	int pid, ppid;
	u_int i;
	char psbuf[256+MAXHOSTNAMELEN];		/* XXX - conservative */
	uint16_t ngroups;

	mutex_enter(&proc_lock);
	mutex_enter(p->p_lock);

	pid = p->p_pid;
	ppid = p->p_ppid;

	ps = psbuf;
	ps += snprintf(ps, sizeof(psbuf), "Name:\t%s\n", p->p_comm);
	ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf), "Pid:\t%d\n", pid);
	ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf), "PPid:\t%d\n", ppid);
	ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf), "TracerPid:\t%d\n", 0);

	cr = p->p_cred;
	ngroups = kauth_cred_ngroups(cr);
	ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf), "Groups:\t");
	for (i = 0; i < ngroups; i++)
		ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf), "%d ",
		    kauth_cred_group(cr, i));
	ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf), "\n");

	ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf),
	    "VmPeak:\t%8" PRIu64 " kB\n", p->p_rlimit[RLIMIT_DATA].rlim_cur / 1024);
	ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf),
	    "VmSize:\t%8" PRIu64 " kB\n", p->p_rlimit[RLIMIT_DATA].rlim_cur / 1024);
	ps += snprintf(ps, sizeof(psbuf) - (ps - psbuf),
	    "VmRSS:\t%8" PRIu64 " kB\n", p->p_rlimit[RLIMIT_RSS].rlim_cur / 1024);

	mutex_exit(p->p_lock);
	mutex_exit(&proc_lock);

	return (uiomove_frombuf(psbuf, ps - psbuf, uio));
}

int
procfs_dostatus(struct lwp *curl, struct lwp *l, struct pfsnode *pfs,
    struct uio *uio)
{
	const char *emulname = curlwp->l_proc->p_emul->e_name;

	if (uio->uio_rw != UIO_READ)
		return (EOPNOTSUPP);

	if (strncmp(emulname, "linux", 5) == 0) {
		return procfs_status_linux(l, uio);
	} else {
		return procfs_status_netbsd(l, uio);
	}
}