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If reading values from a live system, use sysctls net.ns.spp.(debug|debx).

This commit is contained in:
rpaulo 2005-09-06 02:58:48 +00:00
parent 67a0c36218
commit 1f649eba90
1 changed files with 46 additions and 36 deletions
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82
usr.sbin/trsp/trsp.c
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@ -1,4 +1,4 @@
/* $NetBSD: trsp.c,v 1.10 2005/09/05 23:17:08 rpaulo Exp $ */
/* $NetBSD: trsp.c,v 1.11 2005/09/06 02:58:48 rpaulo Exp $ */
/*-
* Copyright (c) 1997 The NetBSD Foundation, Inc.
@ -77,7 +77,7 @@ __COPYRIGHT(
#if 0
static char sccsid[] = "@(#)trsp.c 8.1 (Berkeley) 6/6/93";
#else
__RCSID("$NetBSD: trsp.c,v 1.10 2005/09/05 23:17:08 rpaulo Exp $");
__RCSID("$NetBSD: trsp.c,v 1.11 2005/09/06 02:58:48 rpaulo Exp $");
#endif
#endif /* not lint */
@ -85,6 +85,7 @@ __RCSID("$NetBSD: trsp.c,v 1.10 2005/09/05 23:17:08 rpaulo Exp $");
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#define PRUREQUESTS
#include <sys/protosw.h>
@ -149,12 +150,10 @@ void usage(void);
int
main(int argc, char *argv[])
{
int ch, i, npcbs = 0;
int ch, i, npcbs = 0, use_sysctl;
char *system, *core, *cp, errbuf[_POSIX2_LINE_MAX];
gid_t egid = getegid();
unsigned long l;
(void)setegid(getgid());
system = core = NULL;
while ((ch = getopt(argc, argv, "azstjp:N:M:")) != -1) {
@ -202,36 +201,39 @@ main(int argc, char *argv[])
if (argc)
usage();
/*
* Discard setgid privileges if not the running kernel so that bad
* guys can't print interesting stuff from kernel memory.
*/
if (core != NULL || system != NULL)
setgid(getgid());
else
setegid(egid);
use_sysctl = (system == NULL && core == NULL);
kd = kvm_openfiles(system, core, NULL, zflag ? O_RDWR : O_RDONLY,
errbuf);
if (kd == NULL)
errx(1, "can't open kmem: %s", errbuf);
if (use_sysctl) {
size_t lenx = sizeof(spp_debx);
size_t lend = sizeof(spp_debug);
/* get rid of it now anyway */
if (core == NULL && system == NULL)
setgid(getgid());
if (sysctlbyname("net.ns.spp.debx", &spp_debx, &lenx, NULL,
0) == -1)
err(1, "net.ns.spp.debx");
if (sysctlbyname("net.ns.spp.debug", &spp_debug, &lend, NULL,
0) == -1)
err(1, "net.ns.spp.debug");
} else {
kd = kvm_openfiles(system, core, NULL,
zflag ? O_RDWR : O_RDONLY, errbuf);
if (kd == NULL)
errx(1, "can't open kmem: %s", errbuf);
if (kvm_nlist(kd, nl))
errx(2, "%s: no namelist", system ? system : _PATH_UNIX);
if (kvm_nlist(kd, nl))
errx(2, "%s: no namelist", system);
if (kvm_read(kd, nl[N_SPP_DEBX].n_value, &spp_debx,
sizeof(spp_debx)) != sizeof(spp_debx))
errx(3, "spp_debx: %s", kvm_geterr(kd));
if (kvm_read(kd, nl[N_SPP_DEBUG].n_value, spp_debug,
sizeof(spp_debug)) != sizeof(spp_debug))
errx(3, "spp_debug: %s", kvm_geterr(kd));
}
if (kvm_read(kd, nl[N_SPP_DEBX].n_value, &spp_debx,
sizeof(spp_debx)) != sizeof(spp_debx))
errx(3, "spp_debx: %s", kvm_geterr(kd));
printf("spp_debx=%d\n", spp_debx);
if (kvm_read(kd, nl[N_SPP_DEBUG].n_value, spp_debug,
sizeof(spp_debug)) != sizeof(spp_debug))
errx(3, "spp_debug: %s", kvm_geterr(kd));
/*
* Here, we just want to clear out the old trace data and start over.
*/
@ -239,14 +241,22 @@ main(int argc, char *argv[])
spp_debx = 0;
(void) memset(spp_debug, 0, sizeof(spp_debug));
if (kvm_write(kd, nl[N_SPP_DEBX].n_value, &spp_debx,
sizeof(spp_debx)) != sizeof(spp_debx))
errx(4, "write spp_debx: %s", kvm_geterr(kd));
if (use_sysctl) {
if (sysctlbyname("net.ns.spp.debx", NULL, 0,
&spp_debx, sizeof(spp_debx)) == -1)
err(1, "write spp_debx");
if (sysctlbyname("net.ns.spp.debug", NULL, 0,
&spp_debug, sizeof(spp_debug)) == -1)
err(1, "write spp_debug");
} else {
if (kvm_write(kd, nl[N_SPP_DEBX].n_value, &spp_debx,
sizeof(spp_debx)) != sizeof(spp_debx))
errx(4, "write spp_debx: %s", kvm_geterr(kd));
if (kvm_write(kd, nl[N_SPP_DEBUG].n_value, spp_debug,
sizeof(spp_debug)) != sizeof(spp_debug))
errx(4, "write spp_debug: %s", kvm_geterr(kd));
if (kvm_write(kd, nl[N_SPP_DEBUG].n_value, spp_debug,
sizeof(spp_debug)) != sizeof(spp_debug))
errx(4, "write spp_debug: %s", kvm_geterr(kd));
}
exit(0);
}