/*      $NetBSD: misc.c,v 1.27 2023/07/29 08:46:47 riastradh Exp $      */

/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas
*
* 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.
*/

#include <sys/cdefs.h>
__RCSID("$NetBSD: misc.c,v 1.27 2023/07/29 08:46:47 riastradh Exp $");

#include <stdbool.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/condvar.h>
#include <sys/selinfo.h>
#include <sys/filedesc.h>
#define _KERNEL
#include <sys/mqueue.h>
#include <sys/eventvar.h>
#undef _KERNEL
#include <sys/proc.h>
#define _KERNEL
#include <sys/file.h>
#define copyin_t int
#define copyout_t int
#include <sys/ksem.h>
#define _LIB_LIBKERN_LIBKERN_H_
#define mutex_enter(a)
#define mutex_exit(a)
#undef _KERNEL
#include <sys/cprng.h>
#include <sys/vnode.h>
#include <sys/memfd.h>
#include <sys/mount.h>

#include <net/bpfdesc.h>

#include <dev/audio/audiodef.h>
#include <dev/audio/audio_if.h>

#include <err.h>
#include <util.h>
#include <string.h>
#include <kvm.h>
#include "fstat.h"

static struct nlist nl[] = {
#define NL_BPF          0
   { .n_name = "bpf_fileops", },
#define NL_CRYPTO       1
   { .n_name = "cryptofops" },
#define NL_DMIO         2
   { .n_name = "dmio_fileops", },
#define NL_DRVCTL       3
   { .n_name = "drvctl_fileops", },
#define NL_DTV_DEMUX    4
   { .n_name = "dtv_demux_fileops", },
#define NL_FILEMON      5
   { .n_name = "filemon_fileops", },
#define NL_KQUEUE       6
   { .n_name = "kqueueops" },
#define NL_MQUEUE       7
   { .n_name = "mqops" },
#define NL_PIPE         8
   { .n_name = "pipeops" },
#define NL_PUTTER       9
   { .n_name = "putter_fileops", },
#define NL_RND          10
   { .n_name = "rnd_fileops", },
#define NL_SEM          11
   { .n_name = "semops", },
#define NL_SOCKET       12
   { .n_name = "socketops" },
#define NL_SVR4_NET     13
   { .n_name = "svr4_netops" },
#define NL_SVR4_32_NET  14
   { .n_name = "svr4_32_netops" },
#define NL_TAP          15
   { .n_name = "tap_fileops", },
#define NL_VNOPS        16
   { .n_name = "vnops" },
#define NL_XENEVT       17
   { .n_name = "xenevt_fileops" },
#define NL_AUDIO        18
   { .n_name = "audio_fileops" },
#define NL_PAD          19
   { .n_name = "pad_fileops" },
#define NL_MEMFD        20
   { .n_name = "memfd_fileops" },
#define NL_MAX          21
   { .n_name = NULL }
};

extern int vflg;


static int
p_bpf(struct file *f)
{
       struct bpf_d bpf;
       struct bpf_if bi;
       struct ifnet ifn;

       strlcpy(ifn.if_xname, "???", sizeof(ifn.if_xname));

       if (!KVM_READ(f->f_data, &bpf, sizeof(bpf))) {
               dprintf("can't read bpf at %p for pid %d", f->f_data, Pid);
               return 0;
       }
       if (bpf.bd_bif != NULL) {
               if (!KVM_READ(bpf.bd_bif, &bi, sizeof(bi)))
                       dprintf("can't read bpf interface at %p for pid %d",
                           bpf.bd_bif, Pid);
               if (bi.bif_ifp != NULL)
                       if (!KVM_READ(bi.bif_ifp, &ifn, sizeof(ifn)))
                               dprintf("can't read net interfsace"
                                   " at %p for pid %d", bi.bif_ifp, Pid);
       }
       (void)printf("* bpf@%s rec=%lu, dr=%lu, cap=%lu, pid=%lu", ifn.if_xname,
           bpf.bd_rcount, bpf.bd_dcount, bpf.bd_ccount,
           (unsigned long)bpf.bd_pid);
       if (bpf.bd_promisc)
               (void)printf(", promisc");
       if (bpf.bd_immediate)
               (void)printf(", immed");
       if (bpf.bd_direction == BPF_D_IN)
               (void)printf(", in");
       else if (bpf.bd_direction == BPF_D_INOUT)
               (void)printf(", inout");
       else if (bpf.bd_direction == BPF_D_OUT)
               (void)printf(", out");
       if (bpf.bd_jitcode != NULL)
               (void)printf(", jit");
       if (bpf.bd_async)
               (void)printf(", asyncgrp=%lu", (unsigned long)bpf.bd_pgid);
       if (bpf.bd_state == BPF_IDLE)
               (void)printf(", idle");
       else if (bpf.bd_state == BPF_WAITING)
               (void)printf(", waiting");
       else if (bpf.bd_state == BPF_TIMED_OUT)
               (void)printf(", timeout");
       oprint(f, "\n");
       return 0;
}

static int
p_sem(struct file *f)
{
       ksem_t ks;
       if (!KVM_READ(f->f_data, &ks, sizeof(ks))) {
               dprintf("can't read sem at %p for pid %d", f->f_data, Pid);
               return 0;
       }
       (void)printf("* ksem ref=%u, value=%u, waiters=%u, flags=0x%x, "
           "mode=%o, uid=%u, gid=%u", ks.ks_ref, ks.ks_value, ks.ks_waiters,
           ks.ks_flags, ks.ks_mode, ks.ks_uid, ks.ks_gid);
       if (ks.ks_name && ks.ks_namelen) {
               char buf[64];
               if (ks.ks_namelen >= sizeof(buf))
                       ks.ks_namelen = sizeof(buf) - 1;
               if (!KVM_READ(ks.ks_name, buf, ks.ks_namelen)) {
                       dprintf("can't read sem name at %p for pid %d",
                           ks.ks_name, Pid);
               } else {
                       buf[ks.ks_namelen] = '\0';
                       (void)printf(", name=%s", buf);
                       oprint(f, "\n");
                       return 0;
               }
       }
       oprint(f, "\n");
       return 0;
}

static int
p_mqueue(struct file *f)
{
       struct mqueue mq;

       if (!KVM_READ(f->f_data, &mq, sizeof(mq))) {
               dprintf("can't read mqueue at %p for pid %d", f->f_data, Pid);
               return 0;
       }
       (void)printf("* mqueue \"%s\"", mq.mq_name);
       oprint(f, "\n");
       return 0;
}

static int
p_kqueue(struct file *f)
{
       struct kqueue kq;

       if (!KVM_READ(f->f_data, &kq, sizeof(kq))) {
               dprintf("can't read kqueue at %p for pid %d", f->f_data, Pid);
               return 0;
       }
       (void)printf("* kqueue pending %d", kq.kq_count);
       oprint(f, "\n");
       return 0;
}

static int
p_audio(struct file *f)
{
       struct audio_file af;
       const char *devname;
       const char *modename;

       if (!KVM_READ(f->f_data, &af, sizeof(af))) {
               dprintf("can't read audio_file at %p for pid %d",
                   f->f_data, Pid);
               return 0;
       }

       if (ISDEVAUDIO(af.dev)) {
               devname = "audio";
       } else if (ISDEVSOUND(af.dev)) {
               devname = "sound";
       } else if (ISDEVAUDIOCTL(af.dev)) {
               devname = "audioctl";
       } else if (ISDEVMIXER(af.dev)) {
               devname = "mixer";
       } else {
               devname = "???";
       }

       if (af.ptrack && af.rtrack) {
               modename = "playback, record";
       } else if (af.ptrack) {
               modename = "playback";
       } else if (af.rtrack) {
               modename = "record";
       } else {
               modename = "-";
       }

       (void)printf("* audio@%s%d %s", devname, AUDIOUNIT(af.dev), modename);
       oprint(f, "\n");
       return 0;
}

static int
p_memfd_seal(int seen, int all, int target, const char *name)
{
       if (all & target)
               (void)printf("%s%s", (seen ? "|" : ""), name);

       return seen || (all & target);
}

static int
p_memfd(struct file *f)
{
       int seal_yet = 0;
       struct memfd mfd;

       if (!KVM_READ(f->f_data, &mfd, sizeof(mfd))) {
               dprintf("can't read memfd at %p for pid %d", f->f_data, Pid);
               return 0;
       }
       (void)printf("* %s, seals=", mfd.mfd_name);
       if (mfd.mfd_seals == 0)
               (void)printf("0");
       else {
               seal_yet = p_memfd_seal(seal_yet, mfd.mfd_seals, F_SEAL_SEAL, "F_SEAL_SEAL");
               seal_yet = p_memfd_seal(seal_yet, mfd.mfd_seals, F_SEAL_SHRINK, "F_SEAL_SHRINK");
               seal_yet = p_memfd_seal(seal_yet, mfd.mfd_seals, F_SEAL_GROW, "F_SEAL_GROW");
               seal_yet = p_memfd_seal(seal_yet, mfd.mfd_seals, F_SEAL_WRITE, "F_SEAL_WRITE");
               seal_yet = p_memfd_seal(seal_yet, mfd.mfd_seals, F_SEAL_FUTURE_WRITE, "F_SEAL_FUTURE_WRITE");
       }

       oprint(f, "\n");
       return 0;
}

int
pmisc(struct file *f, const char *name)
{
       size_t i;
       if (nl[0].n_value == 0) {
               int n;
               if ((n = KVM_NLIST(nl)) == -1)
                       errx(1, "Cannot list kernel symbols (%s)",
                           KVM_GETERR());
               else if (n != 0 && vflg) {
                       char buf[1024];
                       buf[0] = '\0';
                       for (struct nlist *l = nl; l->n_name != NULL; l++) {
                               if (l->n_value != 0)
                                       continue;
                               strlcat(buf, ", ", sizeof(buf));
                               strlcat(buf, l->n_name, sizeof(buf));
                       }
                       warnx("Could not find %d symbols: %s", n, buf + 2);
               }
       }
       for (i = 0; i < NL_MAX; i++)
               if ((uintptr_t)f->f_ops == nl[i].n_value)
                       break;
       switch (i) {
       case NL_BPF:
               return p_bpf(f);
       case NL_MQUEUE:
               return p_mqueue(f);
       case NL_KQUEUE:
               return p_kqueue(f);
       case NL_RND:
               printf("* random %p", f->f_data);
               break;
       case NL_SEM:
               return p_sem(f);
       case NL_TAP:
               printf("* tap %lu", (unsigned long)(intptr_t)f->f_data);
               break;
       case NL_CRYPTO:
               printf("* crypto %p", f->f_data);
               break;
       case NL_AUDIO:
               return p_audio(f);
       case NL_PAD:
               printf("* pad %p", f->f_data);
               break;
       case NL_MEMFD:
               return p_memfd(f);
       case NL_MAX:
               printf("* %s ops=%p %p", name, f->f_ops, f->f_data);
               break;
       default:
               printf("* %s %p", nl[i].n_name, f->f_data);
               break;
       }
       oprint(f, "\n");
       return 0;
}

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