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If reading values from a live system use sysctls net.tcp.inet.(debug|debx)

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and kern.hardclock_ticks. Also, remove the set*gid() calls.
This commit is contained in:
rpaulo 2005-09-06 03:04:15 +00:00
parent a55d13d962
commit 7c18197a2e
1 changed files with 75 additions and 49 deletions
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124
usr.sbin/trpt/trpt.c
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@ -1,4 +1,4 @@
/* $NetBSD: trpt.c,v 1.20 2005/06/02 09:44:41 lukem Exp $ */
/* $NetBSD: trpt.c,v 1.21 2005/09/06 03:04:15 rpaulo Exp $ */
/*-
* Copyright (c) 1997 The NetBSD Foundation, Inc.
@ -77,7 +77,7 @@ __COPYRIGHT(
#if 0
static char sccsid[] = "@(#)trpt.c 8.1 (Berkeley) 6/6/93";
#else
__RCSID("$NetBSD: trpt.c,v 1.20 2005/06/02 09:44:41 lukem Exp $");
__RCSID("$NetBSD: trpt.c,v 1.21 2005/09/06 03:04:15 rpaulo Exp $");
#endif
#endif /* not lint */
@ -85,6 +85,7 @@ __RCSID("$NetBSD: trpt.c,v 1.20 2005/06/02 09:44:41 lukem Exp $");
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#define PRUREQUESTS
#include <sys/protosw.h>
#include <sys/file.h>
@ -154,19 +155,18 @@ int numeric(const void *, const void *);
void usage(void);
kvm_t *kd;
int use_sysctl;
int
main(int argc, char *argv[])
{
int ch, i, jflag, npcbs;
char *system, *core, *cp, errbuf[_POSIX2_LINE_MAX];
gid_t egid = getegid();
unsigned long l;
(void)setegid(getgid());
jflag = npcbs = 0;
system = core = NULL;
jflag = npcbs = 0;
while ((ch = getopt(argc, argv, "afjp:stN:M:")) != -1) {
switch (ch) {
case 'a':
@ -214,35 +214,34 @@ main(int argc, char *argv[])
if (argc)
usage();
/*
* 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 (core != NULL || system != NULL)
setgid(getgid());
else
setegid(egid);
use_sysctl = (system == NULL && core == NULL);
kd = kvm_openfiles(system, core, NULL, O_RDONLY, errbuf);
if (kd == NULL)
errx(1, "can't open kmem: %s", errbuf);
if (use_sysctl) {
size_t lenx = sizeof(tcp_debx);
size_t lend = sizeof(tcp_debug);
/* get rid of it now anyway */
if (core == NULL && system == NULL)
setgid(getgid());
if (sysctlbyname("net.inet.tcp.debx", &tcp_debx, &lenx,
NULL, 0) == -1)
err(1, "net.inet.tcp.debx");
if (sysctlbyname("net.inet.tcp.debug", &tcp_debug, &lend,
NULL, 0) == -1)
err(1, "net.inet.tcp.debug");
} else {
kd = kvm_openfiles(system, core, NULL, 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_TCP_DEBX].n_value, (char *)&tcp_debx,
sizeof(tcp_debx)) != sizeof(tcp_debx))
errx(3, "tcp_debx: %s", kvm_geterr(kd));
if (kvm_read(kd, nl[N_TCP_DEBX].n_value, (char *)&tcp_debx,
sizeof(tcp_debx)) != sizeof(tcp_debx))
errx(3, "tcp_debx: %s", kvm_geterr(kd));
if (kvm_read(kd, nl[N_TCP_DEBUG].n_value, (char *)tcp_debug,
sizeof(tcp_debug)) != sizeof(tcp_debug))
errx(3, "tcp_debug: %s", kvm_geterr(kd));
if (kvm_read(kd, nl[N_TCP_DEBUG].n_value, (char *)tcp_debug,
sizeof(tcp_debug)) != sizeof(tcp_debug))
errx(3, "tcp_debug: %s", kvm_geterr(kd));
}
/*
* If no control blocks have been specified, figure
@ -353,15 +352,31 @@ dotrace(caddr_t tcpcb)
prev_debx = 0;
do {
sleep(1);
if (kvm_read(kd, nl[N_TCP_DEBX].n_value,
(char *)&tcp_debx, sizeof(tcp_debx)) !=
sizeof(tcp_debx))
errx(3, "tcp_debx: %s", kvm_geterr(kd));
if (use_sysctl) {
size_t len = sizeof(tcp_debx);
if (sysctlbyname("net.inet.tcp.debx",
&tcp_debx, &len, NULL, 0) == -1)
err(1, "net.inet.tcp.debx");
} else
if (kvm_read(kd, nl[N_TCP_DEBX].n_value,
(char *)&tcp_debx, sizeof(tcp_debx)) !=
sizeof(tcp_debx))
errx(3, "tcp_debx: %s",
kvm_geterr(kd));
} while (tcp_debx == prev_debx);
if (kvm_read(kd, nl[N_TCP_DEBUG].n_value, (char *)tcp_debug,
sizeof(tcp_debug)) != sizeof(tcp_debug))
errx(3, "tcp_debug: %s", kvm_geterr(kd));
if (use_sysctl) {
size_t len = sizeof(tcp_debug);
if (sysctlbyname("net.inet.tcp.debug", &tcp_debug,
&len, NULL, 0) == -1)
err(1, "net.inet.tcp.debug");
} else
if (kvm_read(kd, nl[N_TCP_DEBUG].n_value,
(char *)tcp_debug,
sizeof(tcp_debug)) != sizeof(tcp_debug))
errx(3, "tcp_debug: %s", kvm_geterr(kd));
goto again;
}
@ -509,21 +524,32 @@ skipact:
int i;
int hardticks;
if (kvm_read(kd, nl[N_HARDCLOCK_TICKS].n_value,
(char *)&hardticks, sizeof(hardticks)) != sizeof(hardticks))
errx(3, "hardclock_ticks: %s", kvm_geterr(kd));
if (use_sysctl) {
size_t len = sizeof(hardticks);
for (i = 0; i < TCPT_NTIMERS; i++) {
if ((tp->t_timer[i].c_flags & CALLOUT_PENDING) == 0)
continue;
printf("%s%s=%d", cp, tcptimers[i],
tp->t_timer[i].c_time - hardticks);
if (i == TCPT_REXMT)
printf(" (t_rxtshft=%d)", tp->t_rxtshift);
cp = ", ";
if (sysctlbyname("kern.hardclock_ticks", &hardticks,
&len, NULL, 0) == -1)
err(1, "kern.hardclock_ticks");
} else {
if (kvm_read(kd, nl[N_HARDCLOCK_TICKS].n_value,
(char *)&hardticks,
sizeof(hardticks)) != sizeof(hardticks))
errx(3, "hardclock_ticks: %s", kvm_geterr(kd));
for (i = 0; i < TCPT_NTIMERS; i++) {
if ((tp->t_timer[i].c_flags
& CALLOUT_PENDING) == 0)
continue;
printf("%s%s=%d", cp, tcptimers[i],
tp->t_timer[i].c_time - hardticks);
if (i == TCPT_REXMT)
printf(" (t_rxtshft=%d)",
tp->t_rxtshift);
cp = ", ";
}
if (*cp != '\t')
putchar('\n');
}
if (*cp != '\t')
putchar('\n');
}
}