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Switch the printing of open sockets from ugly KVM internals to use
kvm_getfiles. This allows to run netstat without any extra privileges
and removes another setgid program from base..
There is still kvm reader code in there which is used for debugging
purposes (crashdump). netstat should still behave mostly the same.
deraadt@ and sthen@ agree that it is time to get this puppy in.

/*	$OpenBSD: unix.c,v 1.26 2015/02/12 01:49:02 claudio Exp $	*/
/*	$NetBSD: unix.c,v 1.13 1995/10/03 21:42:48 thorpej 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.
 */

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

#include <netinet/in.h>

#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <kvm.h>
#include "netstat.h"

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

void
unixdomainpr(struct kinfo_file *kf)
{
	static int first = 1;

	/* XXX should fix kinfo_file instead but not now */
	if (kf->so_pcb == -1)
		kf->so_pcb = 0;

	if (first) {
		printf("Active UNIX domain sockets\n");
		printf("%-*.*s %-6.6s %-6.6s %-6.6s %*.*s %*.*s %*.*s %*.*s Addr\n",
		    PLEN, PLEN, "Address", "Type", "Recv-Q", "Send-Q",
		    PLEN, PLEN, "Inode", PLEN, PLEN, "Conn",
		    PLEN, PLEN, "Refs", PLEN, PLEN, "Nextref");
		first = 0;
	}

	printf("%#*llx%s %-6.6s %6llu %6llu %#*llx%s %#*llx%s %#*llx%s %#*llx%s",
	    FAKE_PTR(kf->so_pcb), socktype[kf->so_type],
	    kf->so_rcv_cc, kf->so_snd_cc,
	    FAKE_PTR(kf->v_un),
	    FAKE_PTR(kf->unp_conn),
	    FAKE_PTR(kf->unp_refs),
	    FAKE_PTR(kf->unp_nextref));
	if (kf->unp_path[0] != '\0')
		printf(" %.*s", KI_UNPPATHLEN, kf->unp_path);
	putchar('\n');
}

/*
 * Dump the contents of a UNIX PCB
 */
void
unpcb_dump(u_long off)
{
	struct unpcb unp;

	if (off == 0)
		return;
	kread(off, &unp, sizeof(unp));

	if (vflag)
		socket_dump((u_long)unp.unp_socket);

#define	p(fmt, v, sep) printf(#v " " fmt sep, unp.v);
#define	pll(fmt, v, sep) printf(#v " " fmt sep, (long long) unp.v);
#define	pull(fmt, v, sep) printf(#v " " fmt sep, (unsigned long long) unp.v);
#define	pp(fmt, v, sep) printf(#v " " fmt sep, unp.v);
	printf("unpcb %#lx\n ", off);
	pp("%p", unp_socket, "\n ");
	pp("%p", unp_vnode, ", ");
	pull("%llu", unp_ino, "\n ");
	pp("%p", unp_conn, ", ");
	pp("%p", unp_refs, ", ");
	pp("%p", unp_nextref, "\n ");
	pp("%p", unp_addr, "\n ");
	p("%#.8x", unp_flags, "\n ");
	p("%u", unp_connid.uid, ", ");
	p("%u", unp_connid.gid, ", ");
	p("%d", unp_connid.pid, "\n ");
	p("%d", unp_cc, ", ");
	p("%d", unp_mbcnt, "\n ");
	pll("%lld", unp_ctime.tv_sec, ", ");
	p("%ld", unp_ctime.tv_nsec, "\n");
#undef p
#undef pp
}