/*      $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);
       }
}

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