usr/src/usr.sbin/trpt/trpt.c

/*
 * 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. 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, 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 */

#include <sys/param.h>
#if BSD >= 199103
#define NEWVM
#endif
#ifndef NEWVM
#include <machine/pte.h>
#include <sys/vmmac.h>
#endif
#include <sys/socket.h>
#include <sys/socketvar.h>
#define PRUREQUESTS
#include <sys/protosw.h>
#include <sys/file.h>

#include <net/route.h>
#include <net/if.h>

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#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>
#include <netinet/tcp_var.h>
#include <netinet/tcpip.h>
#define TANAMES
#include <netinet/tcp_debug.h>

#include <arpa/inet.h>

#include <stdio.h>
#include <errno.h>
#include <nlist.h>
#include <paths.h>

struct nlist nl[] = {
#define N_TCP_DEBUG     0
        { "_tcp_debug" },
#define N_TCP_DEBX      1
        { "_tcp_debx" },
#ifndef NEWVM
#define N_SYSMAP        2
        { "_Sysmap" },
#define N_SYSSIZE       3
        { "_Syssize" },
#endif
        { "" },
};

#ifndef NEWVM
static struct pte *Sysmap;
#endif
static caddr_t tcp_pcbs[TCP_NDEBUG];
static n_time ntime;
static int aflag, kflag, memf, follow, sflag, tflag;

main(argc, argv)
        int argc;
        char **argv;
{
        extern char *optarg;
        extern int optind;
        int ch, i, jflag, npcbs, numeric();
        char *system, *core, *malloc();
        off_t lseek();

        jflag = npcbs = 0;
        while ((ch = getopt(argc, argv, "afjp:st")) != EOF)
                switch (ch) {
                case 'a':
                        ++aflag;
                        break;
                case 'f':
                        ++follow;
                        setlinebuf(stdout);
                        break;
                case 'j':
                        ++jflag;
                        break;
                case 'p':
                        if (npcbs >= TCP_NDEBUG) {
                                fputs("trpt: too many pcb's specified\n",
                                    stderr);
                                exit(1);
                        }
                        (void)sscanf(optarg, "%x", (int *)&tcp_pcbs[npcbs++]);
                        break;
                case 's':
                        ++sflag;
                        break;
                case 't':
                        ++tflag;
                        break;
                case '?':
                default:
                        (void)fprintf(stderr,
"usage: trpt [-afjst] [-p hex-address] [system [core]]\n");
                        exit(1);
                }
        argc -= optind;
        argv += optind;

        core = _PATH_KMEM;
        if (argc > 0) {
                system = *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.
                 */
                setgid(getgid());
        }
        else
                system = _PATH_UNIX;

        if (nlist(system, nl) < 0 || !nl[0].n_value) {
                fprintf(stderr, "trpt: %s: no namelist\n", system);
                exit(1);
        }
        if ((memf = open(core, O_RDONLY)) < 0) {
                perror(core);
                exit(2);
        }
        if (kflag) {
#ifdef NEWVM
                fputs("trpt: can't do core files yet\n", stderr);
                exit(1);
#else
                off_t off;

                Sysmap = (struct pte *)
                   malloc((u_int)(nl[N_SYSSIZE].n_value * sizeof(struct pte)));
                if (!Sysmap) {
                        fputs("trpt: can't get memory for Sysmap.\n", stderr);
                        exit(1);
                }
                off = nl[N_SYSMAP].n_value & ~KERNBASE;
                (void)lseek(memf, off, L_SET);
                (void)read(memf, (char *)Sysmap,
                    (int)(nl[N_SYSSIZE].n_value * sizeof(struct pte)));
#endif
        }
        (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)) {
                perror("trpt: tcp_debx");
                exit(3);
        }
        (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)) {
                perror("trpt: tcp_debug");
                exit(3);
        }
        /*
         * 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++) {
                        register struct tcp_debug *td = &tcp_debug[i];
                        register 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("%x", (int)tcp_pcbs[i]);
                        if (++i == npcbs)
                                break;
                        fputs(", ", stdout);
                }
                putchar('\n');
        }
        else for (i = 0; i < npcbs; i++) {
                printf("\n%x:\n", (int)tcp_pcbs[i]);
                dotrace(tcp_pcbs[i]);
        }
        exit(0);
}

dotrace(tcpcb)
        register caddr_t tcpcb;
{
        register struct tcp_debug *td;
        register int i;
        int prev_debx = tcp_debx;

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);
                tcp_trace(td->td_act, td->td_ostate, td->td_tcb, &td->td_cb,
                    &td->td_ti, td->td_req);
                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);
                tcp_trace(td->td_act, td->td_ostate, td->td_tcb, &td->td_cb,
                    &td->td_ti, td->td_req);
        }
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)) {
                                perror("trpt: tcp_debx");
                                exit(3);
                        }
                } 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)) {
                        perror("trpt: tcp_debug");
                        exit(3);
                }
                goto again;
        }
}

/*
 * Tcp debug routines
 */
/*ARGSUSED*/
tcp_trace(act, ostate, atp, tp, ti, req)
        short act, ostate;
        struct tcpcb *atp, *tp;
        struct tcpiphdr *ti;
        int req;
{
        tcp_seq seq, ack;
        int flags, len, win, timer;

        printf("%03ld %s:%s ",(ntime/10) % 1000, tcpstates[ostate],
            tanames[act]);
        switch (act) {
        case TA_INPUT:
        case TA_OUTPUT:
        case TA_DROP:
                if (aflag) {
                        printf("(src=%s,%u, ",
                            inet_ntoa(ti->ti_src), ntohs(ti->ti_sport));
                        printf("dst=%s,%u)",
                            inet_ntoa(ti->ti_dst), ntohs(ti->ti_dport));
                }
                seq = ti->ti_seq;
                ack = ti->ti_ack;
                len = ti->ti_len;
                win = ti->ti_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)", seq, seq + len);
                else
                        printf("%lx", seq);
                printf("@%lx", ack);
                if (win)
                        printf("(win=%x)", win);
                flags = ti->ti_flags;
                if (flags) {
                        register char *cp = "<";
#define pf(flag, string) { \
        if (ti->ti_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 %x snd_una %lx snd_nxt %lx snd_max %lx\n",
                    tp->rcv_nxt, tp->rcv_wnd, tp->snd_una, tp->snd_nxt,
                    tp->snd_max);
                printf("\tsnd_wl1 %lx snd_wl2 %lx snd_wnd %x\n", tp->snd_wl1,
                    tp->snd_wl2, tp->snd_wnd);
        }
        /* print out timers? */
        if (tflag) {
                register char *cp = "\t";
                register int i;

                for (i = 0; i < TCPT_NTIMERS; i++) {
                        if (tp->t_timer[i] == 0)
                                continue;
                        printf("%s%s=%d", cp, tcptimers[i], tp->t_timer[i]);
                        if (i == TCPT_REXMT)
                                printf(" (t_rxtshft=%d)", tp->t_rxtshift);
                        cp = ", ";
                }
                if (*cp != '\t')
                        putchar('\n');
        }
}

numeric(c1, c2)
        caddr_t *c1, *c2;
{
        return(*c1 - *c2);
}

klseek(fd, base, off)
        int fd, off;
        off_t base;
{
        off_t lseek();

#ifndef NEWVM
        if (kflag) {    /* get kernel pte */
                base &= ~KERNBASE;
                base = ctob(Sysmap[btop(base)].pg_pfnum) + (base & PGOFSET);
        }
#endif
        (void)lseek(fd, base, off);
}