NetBSD/usr.sbin/slstats/slstats.c

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/* $NetBSD: slstats.c,v 1.14 2002/06/18 22:32:16 itojun Exp $ */
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/*
* print serial line IP statistics:
* slstats [-i interval] [-v] [interface] [system [core]]
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*
* Contributed by Van Jacobson (van@ee.lbl.gov), Dec 31, 1989.
*
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* Copyright (c) 1989, 1990, 1991, 1992 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.
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*
* 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.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
__RCSID("$NetBSD: slstats.c,v 1.14 2002/06/18 22:32:16 itojun Exp $");
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#endif
#define INET
#include <sys/param.h>
#include <sys/mbuf.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/file.h>
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#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <net/slcompress.h>
#include <net/if_slvar.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <kvm.h>
#include <limits.h>
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#include <nlist.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
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#include <string.h>
#include <unistd.h>
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struct nlist nl[] = {
#define N_SOFTC 0
{ "_sl_softc" },
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{ "" },
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};
char *kernel; /* kernel for namelist */
char *kmemf; /* memory file */
kvm_t *kd;
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int vflag;
unsigned interval = 5;
int unit;
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void catchalarm __P((int));
void intpr __P((void));
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int main __P((int, char **));
void usage __P((void));
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int
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main(argc, argv)
int argc;
char *argv[];
{
char errbuf[_POSIX2_LINE_MAX];
gid_t egid = getegid();
int ch;
setegid(getgid());
while ((ch = getopt(argc, argv, "i:M:N:v")) != -1) {
switch (ch) {
case 'i':
interval = atoi(optarg);
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if (interval <= 0)
usage();
break;
case 'M':
kmemf = optarg;
break;
case 'N':
kernel = optarg;
break;
case 'v':
++vflag;
break;
default:
usage();
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}
}
argc -= optind;
argv += optind;
if (argc > 1)
usage();
while (argc--) {
if (isdigit(*argv[0])) {
unit = atoi(*argv);
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if (unit < 0)
usage();
continue;
}
/* Fall to here, we have bogus arguments. */
usage();
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}
/*
* Discard setgid privileges. If not the running kernel, we toss
* them away totally so that bad guys can't print interesting stuff
* from kernel memory, otherwise switch back to kmem for the
* duration of the kvm_openfiles() call.
*/
if (kmemf != NULL || kernel != NULL)
(void)setgid(getgid());
else
(void)setegid(egid);
memset(errbuf, 0, sizeof(errbuf));
if ((kd = kvm_openfiles(kernel, kmemf, NULL, O_RDONLY, errbuf)) == NULL)
errx(1, "can't open kvm: %s", errbuf);
/* get rid of it now anyway */
if (kmemf == NULL && kernel == NULL)
setgid(getgid());
if (kvm_nlist(kd, nl) < 0 || nl[0].n_type == 0)
errx(1, "%s: SLIP symbols not in namelist",
kernel == NULL ? _PATH_UNIX : kernel);
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intpr();
exit(0);
}
#define V(offset) ((line % 20)? sc->offset - osc->offset : sc->offset)
#define AMT (sizeof(*sc) - 2 * sizeof(sc->sc_comp.tstate))
void
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usage()
{
(void)fprintf(stderr, "usage: %s [-M core] [-N system] [-i interval] %s",
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getprogname(), "[-v] [unit]\n");
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exit(1);
}
u_char signalled; /* set if alarm goes off "early" */
/*
* Print a running summary of interface 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
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intpr()
{
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int line = 0;
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int oldmask;
struct sl_softc *sc, *osc;
u_long addr;
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addr = nl[N_SOFTC].n_value + unit * sizeof(struct sl_softc);
sc = (struct sl_softc *)malloc(AMT);
osc = (struct sl_softc *)malloc(AMT);
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memset((char *)osc, 0, AMT);
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while (1) {
if (kvm_read(kd, addr, (char *)sc, AMT) != AMT)
errx(1, "kvm_read: %s", kvm_geterr(kd));
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(void)signal(SIGALRM, catchalarm);
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signalled = 0;
(void)alarm(interval);
if ((line % 20) == 0) {
(void)printf("%8.8s %6.6s %6.6s %6.6s %6.6s",
"IN", "PACK", "COMP", "UNCOMP", "ERR");
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if (vflag)
printf(" %6.6s %6.6s", "TOSS", "IP");
(void)printf(" | %8.8s %6.6s %6.6s %6.6s %6.6s",
"OUT", "PACK", "COMP", "UNCOMP", "IP");
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if (vflag)
(void)printf(" %6.6s %6.6s", "SEARCH", "MISS");
(void)putchar('\n');
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}
(void)printf("%8llu %6ld %6u %6u %6u",
(unsigned long long)V(sc_if.if_ibytes),
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(long)V(sc_if.if_ipackets),
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V(sc_comp.sls_compressedin),
V(sc_comp.sls_uncompressedin),
V(sc_comp.sls_errorin));
if (vflag)
(void)printf(" %6u %6llu",
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V(sc_comp.sls_tossed),
(unsigned long long)(V(sc_if.if_ipackets) -
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V(sc_comp.sls_compressedin) -
V(sc_comp.sls_uncompressedin) -
V(sc_comp.sls_errorin)));
(void)printf(" | %8llu %6llu %6u %6u %6llu",
(unsigned long long)V(sc_if.if_obytes),
(unsigned long long)V(sc_if.if_opackets),
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V(sc_comp.sls_compressed),
V(sc_comp.sls_packets) - V(sc_comp.sls_compressed),
(unsigned long long)(V(sc_if.if_opackets) -
V(sc_comp.sls_packets)));
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if (vflag)
(void)printf(" %6u %6u",
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V(sc_comp.sls_searches),
V(sc_comp.sls_misses));
(void)putchar('\n');
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fflush(stdout);
line++;
oldmask = sigblock(sigmask(SIGALRM));
if (!signalled)
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sigpause(0);
sigsetmask(oldmask);
signalled = 0;
(void)alarm(interval);
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memmove((char *)osc, (char *)sc, AMT);
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}
}
/*
* Called if an interval expires before sidewaysintpr has completed a loop.
* Sets a flag to not wait for the alarm.
*/
void
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catchalarm(dummy)
int dummy;
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{
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signalled = 1;
}