/*
 * Copyright (c) 1983, 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rick Macklem at The University of Guelph.
 *
 * 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.
 */

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1983, 1989, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
/*static char sccsid[] = "From: @(#)nfsstat.c	8.1 (Berkeley) 6/6/93";*/
static const char rcsid[] =
  "$FreeBSD: stable/2.1/usr.bin/nfsstat/nfsstat.c 50952 1999-09-05 11:54:50Z peter $";
#endif /* not lint */

#include <sys/param.h>
#include <sys/mount.h>
#include <sys/sysctl.h>
#include <nfs/nfsv2.h>
#include <nfs/nfs.h>
#include <signal.h>
#include <fcntl.h>
#include <ctype.h>
#include <errno.h>
#include <kvm.h>
#include <nlist.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <paths.h>
#include <err.h>

struct nlist nl[] = {
#define	N_NFSSTAT	0
	{ "_nfsstats" },
	"",
};
kvm_t *kd;

static int deadkernel = 0;

void intpr(void), printhdr(void), sidewaysintpr(u_int), usage(void);

main(argc, argv)
	int argc;
	char **argv;
{
	extern int optind;
	extern char *optarg;
	u_int interval;
	int ch;
	char *memf, *nlistf;
	char errbuf[80];

	interval = 0;
	memf = nlistf = NULL;
	while ((ch = getopt(argc, argv, "M:N:w:")) != EOF)
		switch(ch) {
		case 'M':
			memf = optarg;
			break;
		case 'N':
			nlistf = optarg;
			break;
		case 'w':
			interval = atoi(optarg);
			break;
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

#define	BACKWARD_COMPATIBILITY
#ifdef	BACKWARD_COMPATIBILITY
	if (*argv) {
		interval = atoi(*argv);
		if (*++argv) {
			nlistf = *argv;
			if (*++argv)
				memf = *argv;
		}
	}
#endif
	/*
	 * Discard setgid privileges if not the running kernel so that bad
	 * guys can't print interesting stuff from kernel memory.
	 */
	if (nlistf != NULL || memf != NULL) {
		setgid(getgid());
		deadkernel = 1;

		if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY,
					errbuf)) == 0) {
			errx(1, "kvm_openfiles: %s", errbuf);
		}
		if (kvm_nlist(kd, nl) != 0) {
			errx(1, "kvm_nlist: can't get names");
		}
	}

	if (interval)
		sidewaysintpr(interval);
	else
		intpr();
	exit(0);
}

/*
 * Read the nfs stats using sysctl(3) for live kernels, or kvm_read
 * for dead ones.
 */
void
readstats(struct nfsstats *stp)
{
	if(deadkernel) {
		if(kvm_read(kd, (u_long)nl[N_NFSSTAT].n_value, stp,
			    sizeof *stp) < 0) {
			err(1, "kvm_read");
		}
	} else {
		int name[3];
		size_t buflen = sizeof *stp;

		name[0] = CTL_FS;
		name[1] = MOUNT_NFS;
		name[2] = NFS_NFSSTATS;

		if(sysctl(name, 3, stp, &buflen, (void *)0, (size_t)0) < 0) {
			err(1, "sysctl");
		}
	}
}

/*
 * Print a description of the nfs stats.
 */
void
intpr(void)
{
	struct nfsstats nfsstats;

	readstats(&nfsstats);

	printf("Client Info:\n");
	printf("Rpc Counts:\n");
	printf("%9.9s %9.9s %9.9s %9.9s %9.9s %9.9s %9.9s %9.9s\n",
		"Getattr", "Setattr", "Lookup", "Readlink", "Read",
		"Write", "Create", "Remove");
	printf("%9d %9d %9d %9d %9d %9d %9d %9d\n",
		nfsstats.rpccnt[NFSPROC_GETATTR],
		nfsstats.rpccnt[NFSPROC_SETATTR],
		nfsstats.rpccnt[NFSPROC_LOOKUP],
		nfsstats.rpccnt[NFSPROC_READLINK],
		nfsstats.rpccnt[NFSPROC_READ],
		nfsstats.rpccnt[NFSPROC_WRITE],
		nfsstats.rpccnt[NFSPROC_CREATE],
		nfsstats.rpccnt[NFSPROC_REMOVE]);
	printf("%9.9s %9.9s %9.9s %9.9s %9.9s %9.9s %9.9s %9.9s\n",
		"Rename", "Link", "Symlink", "Mkdir", "Rmdir",
		"Readdir", "Statfs", "RdirLook");
	printf("%9d %9d %9d %9d %9d %9d %9d %9d\n",
		nfsstats.rpccnt[NFSPROC_RENAME],
		nfsstats.rpccnt[NFSPROC_LINK],
		nfsstats.rpccnt[NFSPROC_SYMLINK],
		nfsstats.rpccnt[NFSPROC_MKDIR],
		nfsstats.rpccnt[NFSPROC_RMDIR],
		nfsstats.rpccnt[NFSPROC_READDIR],
		nfsstats.rpccnt[NFSPROC_STATFS],
		nfsstats.rpccnt[NQNFSPROC_READDIRLOOK]);
	printf("%9.9s %9.9s %9.9s\n",
		"GLease", "Vacate", "Evict");
	printf("%9d %9d %9d\n",
		nfsstats.rpccnt[NQNFSPROC_GETLEASE],
		nfsstats.rpccnt[NQNFSPROC_VACATED],
		nfsstats.rpccnt[NQNFSPROC_EVICTED]);
	printf("Rpc Info:\n");
	printf("%9.9s %9.9s %9.9s %9.9s %9.9s\n",
		"TimedOut", "Invalid", "X Replies", "Retries", "Requests");
	printf("%9d %9d %9d %9d %9d\n",
		nfsstats.rpctimeouts,
		nfsstats.rpcinvalid,
		nfsstats.rpcunexpected,
		nfsstats.rpcretries,
		nfsstats.rpcrequests);
	printf("Cache Info:\n");
	printf("%9.9s %9.9s %9.9s %9.9s",
		"Attr Hits", "Misses", "Lkup Hits", "Misses");
	printf(" %9.9s %9.9s %9.9s %9.9s\n",
		"BioR Hits", "Misses", "BioW Hits", "Misses");
	printf("%9d %9d %9d %9d",
		nfsstats.attrcache_hits, nfsstats.attrcache_misses,
		nfsstats.lookupcache_hits, nfsstats.lookupcache_misses);
	printf(" %9d %9d %9d %9d\n",
		nfsstats.biocache_reads-nfsstats.read_bios,
		nfsstats.read_bios,
		nfsstats.biocache_writes-nfsstats.write_bios,
		nfsstats.write_bios);
	printf("%9.9s %9.9s %9.9s %9.9s",
		"BioRLHits", "Misses", "BioD Hits", "Misses");
	printf(" %9.9s %9.9s\n", "DirE Hits", "Misses");
	printf("%9d %9d %9d %9d",
		nfsstats.biocache_readlinks-nfsstats.readlink_bios,
		nfsstats.readlink_bios,
		nfsstats.biocache_readdirs-nfsstats.readdir_bios,
		nfsstats.readdir_bios);
	printf(" %9d %9d\n",
		nfsstats.direofcache_hits, nfsstats.direofcache_misses);
	printf("\nServer Info:\n");
	printf("%9.9s %9.9s %9.9s %9.9s %9.9s %9.9s %9.9s %9.9s\n",
		"Getattr", "Setattr", "Lookup", "Readlink", "Read",
		"Write", "Create", "Remove");
	printf("%9d %9d %9d %9d %9d %9d %9d %9d\n",
		nfsstats.srvrpccnt[NFSPROC_GETATTR],
		nfsstats.srvrpccnt[NFSPROC_SETATTR],
		nfsstats.srvrpccnt[NFSPROC_LOOKUP],
		nfsstats.srvrpccnt[NFSPROC_READLINK],
		nfsstats.srvrpccnt[NFSPROC_READ],
		nfsstats.srvrpccnt[NFSPROC_WRITE],
		nfsstats.srvrpccnt[NFSPROC_CREATE],
		nfsstats.srvrpccnt[NFSPROC_REMOVE]);
	printf("%9.9s %9.9s %9.9s %9.9s %9.9s %9.9s %9.9s %9.9s\n",
		"Rename", "Link", "Symlink", "Mkdir", "Rmdir",
		"Readdir", "Statfs", "RdirLook");
	printf("%9d %9d %9d %9d %9d %9d %9d %9d\n",
		nfsstats.srvrpccnt[NFSPROC_RENAME],
		nfsstats.srvrpccnt[NFSPROC_LINK],
		nfsstats.srvrpccnt[NFSPROC_SYMLINK],
		nfsstats.srvrpccnt[NFSPROC_MKDIR],
		nfsstats.srvrpccnt[NFSPROC_RMDIR],
		nfsstats.srvrpccnt[NFSPROC_READDIR],
		nfsstats.srvrpccnt[NFSPROC_STATFS],
		nfsstats.srvrpccnt[NQNFSPROC_READDIRLOOK]);
	printf("%9.9s %9.9s %9.9s\n",
		"GLease", "Vacate", "Evict");
	printf("%9d %9d %9d\n",
		nfsstats.srvrpccnt[NQNFSPROC_GETLEASE],
		nfsstats.srvrpccnt[NQNFSPROC_VACATED],
		nfsstats.srvrpccnt[NQNFSPROC_EVICTED]);
	printf("Server Ret-Failed\n");
	printf("%17d\n", nfsstats.srvrpc_errs);
	printf("Server Faults\n");
	printf("%13d\n", nfsstats.srv_errs);
	printf("Server Cache Stats:\n");
	printf("%9.9s %9.9s %9.9s %9.9s\n",
		"Inprog", "Idem", "Non-idem", "Misses");
	printf("%9d %9d %9d %9d\n",
		nfsstats.srvcache_inproghits,
		nfsstats.srvcache_idemdonehits,
		nfsstats.srvcache_nonidemdonehits,
		nfsstats.srvcache_misses);
	printf("Server Lease Stats:\n");
	printf("%9.9s %9.9s %9.9s\n",
		"Leases", "PeakL", "GLeases");
	printf("%9d %9d %9d\n",
		nfsstats.srvnqnfs_leases,
		nfsstats.srvnqnfs_maxleases,
		nfsstats.srvnqnfs_getleases);
}

u_char	signalled;			/* set if alarm goes off "early" */

/*
 * Print a running summary of nfs statistics.
 * Repeat display every interval seconds, showing statistics
 * collected over that interval.  Assumes that interval is non-zero.
 * First line printed at top of screen is always cumulative.
 */
void
sidewaysintpr(interval)
	u_int interval;
{
	struct nfsstats nfsstats, lastst;
	int hdrcnt, oldmask;
	void catchalarm();

	(void)signal(SIGALRM, catchalarm);
	signalled = 0;
	(void)alarm(interval);
	bzero((caddr_t)&lastst, sizeof(lastst));

	for (hdrcnt = 1;;) {
		if (!--hdrcnt) {
			printhdr();
			hdrcnt = 20;
		}
		readstats(&nfsstats);
		printf("Client: %8d %8d %8d %8d %8d %8d %8d %8d\n",
		    nfsstats.rpccnt[1]-lastst.rpccnt[1],
		    nfsstats.rpccnt[4]-lastst.rpccnt[4],
		    nfsstats.rpccnt[5]-lastst.rpccnt[5],
		    nfsstats.rpccnt[6]-lastst.rpccnt[6],
		    nfsstats.rpccnt[8]-lastst.rpccnt[8],
		    nfsstats.rpccnt[11]-lastst.rpccnt[11],
		    nfsstats.rpccnt[12]-lastst.rpccnt[12],
		    nfsstats.rpccnt[16]-lastst.rpccnt[16]);
		printf("Server: %8d %8d %8d %8d %8d %8d %8d %8d\n",
		    nfsstats.srvrpccnt[1]-lastst.srvrpccnt[1],
		    nfsstats.srvrpccnt[4]-lastst.srvrpccnt[4],
		    nfsstats.srvrpccnt[5]-lastst.srvrpccnt[5],
		    nfsstats.srvrpccnt[6]-lastst.srvrpccnt[6],
		    nfsstats.srvrpccnt[8]-lastst.srvrpccnt[8],
		    nfsstats.srvrpccnt[11]-lastst.srvrpccnt[11],
		    nfsstats.srvrpccnt[12]-lastst.srvrpccnt[12],
		    nfsstats.srvrpccnt[16]-lastst.srvrpccnt[16]);
		lastst = nfsstats;
		fflush(stdout);
		oldmask = sigblock(sigmask(SIGALRM));
		if (!signalled)
			sigpause(0);
		sigsetmask(oldmask);
		signalled = 0;
		(void)alarm(interval);
	}
	/*NOTREACHED*/
}

void
printhdr()
{
	printf("        %8.8s %8.8s %8.8s %8.8s %8.8s %8.8s %8.8s %8.8s\n",
	    "Getattr", "Lookup", "Readlink", "Read", "Write", "Rename",
	    "Link", "Readdir");
	fflush(stdout);
}

/*
 * Called if an interval expires before sidewaysintpr has completed a loop.
 * Sets a flag to not wait for the alarm.
 */
void
catchalarm()
{
	signalled = 1;
}

void
usage()
{
	(void)fprintf(stderr,
	    "usage: nfsstat [-M core] [-N system] [-w interval]\n");
	exit(1);
}
