/*      $NetBSD: unix.c,v 1.37 2022/09/02 06:25:43 msaitoh Exp $        */

/*-
 * Copyright (c) 1983, 1988, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * 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.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "from: @(#)unix.c        8.1 (Berkeley) 6/6/93";
#else
__RCSID("$NetBSD: unix.c,v 1.37 2022/09/02 06:25:43 msaitoh Exp $");
#endif
#endif /* not lint */

/*
 * Display protocol blocks in the unix domain.
 */
#define _KERNEL
#include <sys/types.h>
#undef _KERNEL
#include <sys/param.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/mbuf.h>
#include <sys/sysctl.h>
#include <sys/un.h>
#include <sys/unpcb.h>
#define _KMEMUSER
#include <sys/file.h>
#undef _KMEMUSER

#include <netinet/in.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <kvm.h>
#include <err.h>
#include "netstat.h"
#include "prog_ops.h"

static  void unixdomainprhdr(void);
static  void unixdomainpr0(u_long, u_long, u_long, u_long, u_long, u_long,
                           u_long, u_long, u_long, struct sockaddr_un *, int);
static  void unixdomainpr(struct socket *, void *);

static struct   file *file, *fileNFILE;
static int      ns_nfiles;

static void
unixdomainprhdr(void)
{
        printf("Active UNIX domain sockets\n");
        printf("%-8.8s %-6.6s %-6.6s %-6.6s %8.8s %8.8s %8.8s %8.8s Addr\n",
            "Address", "Type", "Recv-Q", "Send-Q", "Inode", "Conn", "Refs",
            "Nextref");
}

static  const char * const socktype[] =
    { "#0", "stream", "dgram", "raw", "rdm", "seqpacket" };

static void
unixdomainpr0(u_long so_pcb, u_long so_type, u_long rcvq, u_long sndq,
              u_long inode, u_long conn, u_long refs, u_long nextref,
              u_long addr, struct sockaddr_un *sun, int remote)
{
        printf("%8lx %-6.6s %6ld %6ld %8lx %8lx %8lx %8lx",
            so_pcb, socktype[so_type], rcvq, sndq, inode, conn, refs,
            nextref);
        if (addr || remote)
                printf((remote ? " -> %.*s" : " %.*s"),
                    (int)(sun->sun_len - (sizeof(*sun) - sizeof(sun->sun_path))),
                    sun->sun_path);
        putchar('\n');
}

static void
unixdomainpr(struct socket *so, void *soaddr)
{
        struct unpcb unp, runp;
        struct sockaddr_un sun, rsun;
        static int first = 1;
        int remote = 0;

        if (kread((u_long)so->so_pcb, (char *)&unp, sizeof (unp)))
                return;
        if (unp.unp_addr)
                if (kread((u_long)unp.unp_addr, (char *)&sun, sizeof (sun)))
                        unp.unp_addr = 0;

        if (!unp.unp_addr) {
                memset(&rsun, 0, sizeof(rsun));
                if (unp.unp_conn &&
                    kread((u_long)unp.unp_conn, (char *)&runp, sizeof (runp)) == 0 &&
                    runp.unp_addr &&
                    kread((u_long)runp.unp_addr, (char *)&rsun, sizeof (rsun)) == 0 &&
                    rsun.sun_path[0] != '\0')
                        remote = 1;
        }

        if (first) {
                unixdomainprhdr();
                first = 0;
        }

        unixdomainpr0((u_long)so->so_pcb, so->so_type, so->so_rcv.sb_cc,
                      so->so_snd.sb_cc, (u_long)unp.unp_vnode,
                      (u_long)unp.unp_conn, (u_long)unp.unp_refs,
                      (u_long)unp.unp_nextref, (u_long)unp.unp_addr,
                      remote ? &rsun : &sun, remote);
}

void
unixpr(u_long off)
{
        struct file *fp;
        struct socket sock, *so = &sock;
        char *filebuf;
        struct protosw *unixsw = (struct protosw *)off;

        if (use_sysctl) {
                struct kinfo_pcb *pcblist;
                int mib[8];
                size_t namelen = 0, size = 0, i;
                const char *mibnames[] = {
                        "net.local.stream.pcblist",
                        "net.local.dgram.pcblist",
                        "net.local.seqpacket.pcblist",
                        NULL,
                };
                const char **mibname;
                static int first = 1;

                for (mibname = mibnames; *mibname; mibname++) {
                        memset(mib, 0, sizeof(mib));

                        if (sysctlnametomib(*mibname, mib, &namelen) == -1)
                                err(1, "sysctlnametomib: %s", *mibname);

                        if (prog_sysctl(mib, sizeof(mib) / sizeof(*mib),
                            NULL, &size, NULL, 0) == -1)
                                err(1, "sysctl (query)");

                        if ((pcblist = malloc(size)) == NULL)
                                err(1, "malloc");
                        memset(pcblist, 0, size);

                        mib[6] = sizeof(*pcblist);
                        mib[7] = size / sizeof(*pcblist);

                        if (prog_sysctl(mib, sizeof(mib) / sizeof(*mib),
                                        pcblist, &size, NULL, 0) == -1)
                                err(1, "sysctl (copy)");

                        for (i = 0; i < size / sizeof(*pcblist); i++) {
                                struct kinfo_pcb *ki = &pcblist[i];
                                struct sockaddr_un *sun;
                                int remote = 0;

                                if (first) {
                                        unixdomainprhdr();
                                        first = 0;
                                }

                                sun = (struct sockaddr_un *)&ki->ki_dst;
                                if (sun->sun_path[0] != '\0') {
                                        remote = 1;
                                } else {
                                        sun = (struct sockaddr_un *)&ki->ki_src;
                                }

                                unixdomainpr0(ki->ki_pcbaddr, ki->ki_type,
                                              ki->ki_rcvq, ki->ki_sndq,
                                              ki->ki_vnode, ki->ki_conn,
                                              ki->ki_refs, ki->ki_nextref,
                                              ki->ki_sockaddr, sun, remote);
                        }

                        free(pcblist);
                }

        } else {
                filebuf = (char *)kvm_getfiles(get_kvmd(), KERN_FILE,
                                               0, &ns_nfiles);
                if (filebuf == 0) {
                        printf("file table read error: %s",
                            kvm_geterr(get_kvmd()));
                        return;
                }
                file = (struct file *)(filebuf + sizeof(fp));
                fileNFILE = file + ns_nfiles;
                for (fp = file; fp < fileNFILE; fp++) {
                        if (fp->f_count == 0 || fp->f_type != DTYPE_SOCKET)
                                continue;
                        if (kread((u_long)fp->f_data, (char *)so, sizeof (*so)))
                                continue;
                        /* kludge */
                        if (so->so_proto >= unixsw &&
                            so->so_proto <= unixsw + 2)
                                if (so->so_pcb)
                                        unixdomainpr(so, fp->f_data);
                }
        }
}