/*      $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);
        }
}