/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* 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.
*/
#if 0
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1983, 1988, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)trpt.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#define PRUREQUESTS
#include <sys/protosw.h>
#include <sys/file.h>
#include <sys/time.h>
#include <net/route.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#ifdef INET6
#include <netinet/ip6.h>
#endif
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#define TCPSTATES
#include <netinet/tcp_fsm.h>
#include <netinet/tcp_seq.h>
#define TCPTIMERS
#include <netinet/tcp_timer.h>
#define _WANT_TCPCB
#include <netinet/tcp_var.h>
#include <netinet/tcpip.h>
#define TANAMES
#include <netinet/tcp_debug.h>
#include <arpa/inet.h>
#include <err.h>
#include <nlist.h>
#include <paths.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static struct nlist nl[3];
#define N_TCP_DEBUG 0
#define N_TCP_DEBX 1
static caddr_t tcp_pcbs[TCP_NDEBUG];
static n_time ntime;
static int aflag, kflag, memf, follow, sflag;
static void dotrace(caddr_t);
static void klseek(int, off_t, int);
static int numeric(const void *, const void *);
static void tcp_trace(short, short, struct tcpcb *, int, void *, struct tcphdr *, int);
static void usage(void);
int
main(int argc, char **argv)
{
int ch, i, jflag, npcbs;
const char *core, *syst;
nl[0].n_name = strdup("_tcp_debug");
nl[1].n_name = strdup("_tcp_debx");
jflag = npcbs = 0;
while ((ch = getopt(argc, argv, "afjp:s")) != -1)
switch (ch) {
case 'a':
++aflag;
break;
case 'f':
++follow;
setlinebuf(stdout);
break;
case 'j':
++jflag;
break;
case 'p':
if (npcbs >= TCP_NDEBUG)
errx(1, "too many pcb's specified");
(void)sscanf(optarg, "%x", (int *)&tcp_pcbs[npcbs++]);
break;
case 's':
++sflag;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
core = _PATH_KMEM;
if (argc > 0) {
syst = *argv;
argc--, argv++;
if (argc > 0) {
core = *argv;
argc--, argv++;
++kflag;
}
/*
* Discard setgid privileges if not the running kernel so that
* bad guys can't print interesting stuff from kernel memory.
*/
if (setgid(getgid()) != 0)
err(1, "setgid");
} else
syst = getbootfile();
if (nlist(syst, nl) < 0 || !nl[0].n_value)
errx(1, "%s: no namelist", syst);
if ((memf = open(core, O_RDONLY)) < 0)
err(2, "%s", core);
if (setgid(getgid()) != 0)
err(1, "setgid");
if (kflag)
errx(1, "can't do core files yet");
(void)klseek(memf, (off_t)nl[N_TCP_DEBX].n_value, L_SET);
if (read(memf, (char *)&tcp_debx, sizeof(tcp_debx)) !=
sizeof(tcp_debx))
err(3, "tcp_debx");
(void)klseek(memf, (off_t)nl[N_TCP_DEBUG].n_value, L_SET);
if (read(memf, (char *)tcp_debug, sizeof(tcp_debug)) !=
sizeof(tcp_debug))
err(3, "tcp_debug");
/*
* If no control blocks have been specified, figure
* out how many distinct one we have and summarize
* them in tcp_pcbs for sorting the trace records
* below.
*/
if (!npcbs) {
for (i = 0; i < TCP_NDEBUG; i++) {
struct tcp_debug *td = &tcp_debug[i];
int j;
if (td->td_tcb == 0)
continue;
for (j = 0; j < npcbs; j++)
if (tcp_pcbs[j] == td->td_tcb)
break;
if (j >= npcbs)
tcp_pcbs[npcbs++] = td->td_tcb;
}
if (!npcbs)
exit(0);
}
qsort(tcp_pcbs, npcbs, sizeof(caddr_t), numeric);
if (jflag) {
for (i = 0;;) {
printf("%p", (void *)tcp_pcbs[i]);
if (++i == npcbs)
break;
fputs(", ", stdout);
}
putchar('\n');
} else
for (i = 0; i < npcbs; i++) {
printf("\n%p:\n", tcp_pcbs[i]);
dotrace(tcp_pcbs[i]);
}
exit(0);
}
static void
usage(void)
{
(void)fprintf(stderr,
"usage: trpt [-afjs] [-p hex-address] [system [core]]\n");
exit(1);
}
static void
dotrace(caddr_t tcpcb)
{
struct tcp_debug *td;
int i;
int prev_debx = tcp_debx, family;
again:
if (--tcp_debx < 0)
tcp_debx = TCP_NDEBUG - 1;
for (i = prev_debx % TCP_NDEBUG; i < TCP_NDEBUG; i++) {
td = &tcp_debug[i];
if (tcpcb && td->td_tcb != tcpcb)
continue;
ntime = ntohl(td->td_time);
#ifdef INET6
family = td->td_family;
#else
family = AF_INET;
#endif
switch (family) {
case AF_INET:
tcp_trace(td->td_act, td->td_ostate, &td->td_cb,
td->td_family, &td->td_ti.ti_i, &td->td_ti.ti_t,
td->td_req);
break;
#ifdef INET6
case AF_INET6:
tcp_trace(td->td_act, td->td_ostate, &td->td_cb,
td->td_family, &td->td_ti6.ip6, &td->td_ti6.th,
td->td_req);
break;
#endif
}
if (i == tcp_debx)
goto done;
}
for (i = 0; i <= tcp_debx % TCP_NDEBUG; i++) {
td = &tcp_debug[i];
if (tcpcb && td->td_tcb != tcpcb)
continue;
ntime = ntohl(td->td_time);
#ifdef INET6
family = td->td_family;
#else
family = AF_INET;
#endif
switch (family) {
case AF_INET:
tcp_trace(td->td_act, td->td_ostate, &td->td_cb,
td->td_family, &td->td_ti.ti_i, &td->td_ti.ti_t,
td->td_req);
break;
#ifdef INET6
case AF_INET6:
tcp_trace(td->td_act, td->td_ostate, &td->td_cb,
td->td_family, &td->td_ti6.ip6, &td->td_ti6.th,
td->td_req);
break;
#endif
}
}
done:
if (follow) {
prev_debx = tcp_debx + 1;
if (prev_debx >= TCP_NDEBUG)
prev_debx = 0;
do {
sleep(1);
(void)klseek(memf, (off_t)nl[N_TCP_DEBX].n_value, L_SET);
if (read(memf, (char *)&tcp_debx, sizeof(tcp_debx)) !=
sizeof(tcp_debx))
err(3, "tcp_debx");
} while (tcp_debx == prev_debx);
(void)klseek(memf, (off_t)nl[N_TCP_DEBUG].n_value, L_SET);
if (read(memf, (char *)tcp_debug, sizeof(tcp_debug)) !=
sizeof(tcp_debug))
err(3, "tcp_debug");
goto again;
}
}
/*
* Tcp debug routines
*/
/*ARGSUSED*/
static void
tcp_trace(short act, short ostate, struct tcpcb *tp, int family __unused,
void *ip, struct tcphdr *th, int req)
{
tcp_seq seq, ack;
int flags, len, win, timer;
struct ip *ip4;
#ifdef INET6
bool isipv6, nopkt = true;
struct ip6_hdr *ip6;
char ntop_buf[INET6_ADDRSTRLEN];
#endif
#ifdef INET6
/* Appease GCC -Wmaybe-uninitialized */
ip4 = NULL;
ip6 = NULL;
isipv6 = false;
switch (family) {
case AF_INET:
nopkt = false;
isipv6 = false;
ip4 = (struct ip *)ip;
break;
case AF_INET6:
nopkt = false;
isipv6 = true;
ip6 = (struct ip6_hdr *)ip;
case 0:
default:
break;
}
#else
ip4 = (struct ip *)ip;
#endif
printf("%03ld %s:%s ", (long)((ntime / 10) % 1000), tcpstates[ostate],
tanames[act]);
switch (act) {
case TA_INPUT:
case TA_OUTPUT:
case TA_DROP:
#ifdef INET6
if (nopkt)
break;
#endif
if (aflag) {
printf("(src=%s,%u, ",
#ifdef INET6
isipv6 ? inet_ntop(AF_INET6, &ip6->ip6_src,
ntop_buf, sizeof(ntop_buf)) :
#endif
inet_ntoa(ip4->ip_src), ntohs(th->th_sport));
printf("dst=%s,%u)",
#ifdef INET6
isipv6 ? inet_ntop(AF_INET6, &ip6->ip6_dst,
ntop_buf, sizeof(ntop_buf)) :
#endif
inet_ntoa(ip4->ip_dst), ntohs(th->th_dport));
}
seq = th->th_seq;
ack = th->th_ack;
len =
#ifdef INET6
isipv6 ? ip6->ip6_plen :
#endif
ip4->ip_len;
win = th->th_win;
if (act == TA_OUTPUT) {
seq = ntohl(seq);
ack = ntohl(ack);
len = ntohs(len);
win = ntohs(win);
}
if (act == TA_OUTPUT)
len -= sizeof(struct tcphdr);
if (len)
printf("[%lx..%lx)", (u_long)seq, (u_long)(seq + len));
else
printf("%lx", (u_long)seq);
printf("@%lx", (u_long)ack);
if (win)
printf("(win=%x)", win);
flags = th->th_flags;
if (flags) {
const char *cp = "<";
#define pf(flag, string) { \
if (th->th_flags&flag) { \
(void)printf("%s%s", cp, string); \
cp = ","; \
} \
}
pf(TH_SYN, "SYN");
pf(TH_ACK, "ACK");
pf(TH_FIN, "FIN");
pf(TH_RST, "RST");
pf(TH_PUSH, "PUSH");
pf(TH_URG, "URG");
printf(">");
}
break;
case TA_USER:
timer = req >> 8;
req &= 0xff;
printf("%s", prurequests[req]);
if (req == PRU_SLOWTIMO || req == PRU_FASTTIMO)
printf("<%s>", tcptimers[timer]);
break;
}
printf(" -> %s", tcpstates[tp->t_state]);
/* print out internal state of tp !?! */
printf("\n");
if (sflag) {
printf("\trcv_nxt %lx rcv_wnd %lx snd_una %lx snd_nxt %lx snd_max %lx\n",
(u_long)tp->rcv_nxt, (u_long)tp->rcv_wnd,
(u_long)tp->snd_una, (u_long)tp->snd_nxt,
(u_long)tp->snd_max);
printf("\tsnd_wl1 %lx snd_wl2 %lx snd_wnd %lx\n",
(u_long)tp->snd_wl1, (u_long)tp->snd_wl2,
(u_long)tp->snd_wnd);
}
}
static int
numeric(const void *v1, const void *v2)
{
const caddr_t *c1 = v1, *c2 = v2;
return (*c1 - *c2);
}
static void
klseek(int fd, off_t base, int off)
{
(void)lseek(fd, base, off);
}
