usr.sbin/trpt/trpt.c

   1 /*
   2  * Copyright (c) 1983, 1988, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifndef lint
  35 static const char copyright[] =
  36 "@(#) Copyright (c) 1983, 1988, 1993\n\
  37         The Regents of the University of California.  All rights reserved.\n";
  38 #endif /* not lint */
  39
  40 #ifndef lint
  41 #if 0
  42 static char sccsid[] = "@(#)trpt.c      8.1 (Berkeley) 6/6/93";
  43 #endif
  44 static const char rcsid[] =
  45   "$FreeBSD$";
  46 #endif /* not lint */
  47
  48 #include <sys/param.h>
  49 #include <sys/queue.h>
  50 #include <sys/socket.h>
  51 #include <sys/socketvar.h>
  52 #define PRUREQUESTS
  53 #include <sys/protosw.h>
  54 #include <sys/file.h>
  55 #include <sys/time.h>
  56
  57 #include <net/route.h>
  58 #include <net/if.h>
  59
  60 #include <netinet/in.h>
  61 #include <netinet/in_systm.h>
  62 #include <netinet/ip.h>
  63 #ifdef INET6
  64 #include <netinet/ip6.h>
  65 #endif
  66 #include <netinet/ip_var.h>
  67 #include <netinet/tcp.h>
  68 #define TCPSTATES
  69 #include <netinet/tcp_fsm.h>
  70 #include <netinet/tcp_seq.h>
  71 #define TCPTIMERS
  72 #include <netinet/tcp_timer.h>
  73 #include <netinet/tcp_var.h>
  74 #include <netinet/tcpip.h>
  75 #define TANAMES
  76 #include <netinet/tcp_debug.h>
  77
  78 #include <arpa/inet.h>
  79
  80 #include <err.h>
  81 #include <nlist.h>
  82 #include <paths.h>
  83 #include <stdio.h>
  84 #include <stdlib.h>
  85 #include <unistd.h>
  86
  87 struct nlist nl[] = {
  88 #define N_TCP_DEBUG     0
  89         { "_tcp_debug" },
  90 #define N_TCP_DEBX      1
  91         { "_tcp_debx" },
  92         { "" },
  93 };
  94
  95 static caddr_t tcp_pcbs[TCP_NDEBUG];
  96 static n_time ntime;
  97 static int aflag, kflag, memf, follow, sflag, tflag;
  98
  99 void dotrace __P((caddr_t));
 100 void klseek __P((int, off_t, int));
 101 int numeric __P((const void *, const void *));
 102 void tcp_trace __P((short, short, struct tcpcb *, struct tcpcb *,
 103                         int, void *, struct tcphdr *, int));
 104 static void usage __P((void));
 105
 106 int
 107 main(argc, argv)
 108         int argc;
 109         char **argv;
 110 {
 111         int ch, i, jflag, npcbs;
 112         char *system, *core;
 113
 114         jflag = npcbs = 0;
 115         while ((ch = getopt(argc, argv, "afjp:st")) != -1)
 116                 switch (ch) {
 117                 case 'a':
 118                         ++aflag;
 119                         break;
 120                 case 'f':
 121                         ++follow;
 122                         setlinebuf(stdout);
 123                         break;
 124                 case 'j':
 125                         ++jflag;
 126                         break;
 127                 case 'p':
 128                         if (npcbs >= TCP_NDEBUG)
 129                                 errx(1, "too many pcb's specified");
 130                         (void)sscanf(optarg, "%x", (int *)&tcp_pcbs[npcbs++]);
 131                         break;
 132                 case 's':
 133                         ++sflag;
 134                         break;
 135                 case 't':
 136                         ++tflag;
 137                         break;
 138                 case '?':
 139                 default:
 140                         usage();
 141                 }
 142         argc -= optind;
 143         argv += optind;
 144
 145         core = _PATH_KMEM;
 146         if (argc > 0) {
 147                 system = *argv;
 148                 argc--, argv++;
 149                 if (argc > 0) {
 150                         core = *argv;
 151                         argc--, argv++;
 152                         ++kflag;
 153                 }
 154                 /*
 155                  * Discard setgid privileges if not the running kernel so that
 156                  * bad guys can't print interesting stuff from kernel memory.
 157                  */
 158                 setgid(getgid());
 159         }
 160         else
 161                 system = (char *)getbootfile();
 162
 163         if (nlist(system, nl) < 0 || !nl[0].n_value)
 164                 errx(1, "%s: no namelist", system);
 165         if ((memf = open(core, O_RDONLY)) < 0)
 166                 err(2, "%s", core);
 167         setgid(getgid());
 168         if (kflag)
 169                 errx(1, "can't do core files yet");
 170         (void)klseek(memf, (off_t)nl[N_TCP_DEBX].n_value, L_SET);
 171         if (read(memf, (char *)&tcp_debx, sizeof(tcp_debx)) !=
 172             sizeof(tcp_debx))
 173                 err(3, "tcp_debx");
 174         (void)klseek(memf, (off_t)nl[N_TCP_DEBUG].n_value, L_SET);
 175         if (read(memf, (char *)tcp_debug, sizeof(tcp_debug)) !=
 176             sizeof(tcp_debug))
 177                 err(3, "tcp_debug");
 178         /*
 179          * If no control blocks have been specified, figure
 180          * out how many distinct one we have and summarize
 181          * them in tcp_pcbs for sorting the trace records
 182          * below.
 183          */
 184         if (!npcbs) {
 185                 for (i = 0; i < TCP_NDEBUG; i++) {
 186                         register struct tcp_debug *td = &tcp_debug[i];
 187                         register int j;
 188
 189                         if (td->td_tcb == 0)
 190                                 continue;
 191                         for (j = 0; j < npcbs; j++)
 192                                 if (tcp_pcbs[j] == td->td_tcb)
 193                                         break;
 194                         if (j >= npcbs)
 195                                 tcp_pcbs[npcbs++] = td->td_tcb;
 196                 }
 197                 if (!npcbs)
 198                         exit(0);
 199         }
 200         qsort(tcp_pcbs, npcbs, sizeof(caddr_t), numeric);
 201         if (jflag) {
 202                 for (i = 0;;) {
 203                         printf("%x", (int)tcp_pcbs[i]);
 204                         if (++i == npcbs)
 205                                 break;
 206                         fputs(", ", stdout);
 207                 }
 208                 putchar('\n');
 209         }
 210         else for (i = 0; i < npcbs; i++) {
 211                 printf("\n%x:\n", (int)tcp_pcbs[i]);
 212                 dotrace(tcp_pcbs[i]);
 213         }
 214         exit(0);
 215 }
 216
 217 static void
 218 usage()
 219 {
 220         (void)fprintf(stderr,
 221                 "usage: trpt [-afjst] [-p hex-address] [system [core]]\n");
 222         exit(1);
 223 }
 224
 225 void
 226 dotrace(tcpcb)
 227         register caddr_t tcpcb;
 228 {
 229         register struct tcp_debug *td;
 230         register int i;
 231         int prev_debx = tcp_debx, family;
 232
 233 again:  if (--tcp_debx < 0)
 234                 tcp_debx = TCP_NDEBUG - 1;
 235         for (i = prev_debx % TCP_NDEBUG; i < TCP_NDEBUG; i++) {
 236                 td = &tcp_debug[i];
 237                 if (tcpcb && td->td_tcb != tcpcb)
 238                         continue;
 239                 ntime = ntohl(td->td_time);
 240 #ifdef INET6
 241                 family = td->td_family;
 242 #else
 243                 family = AF_INET;
 244 #endif
 245                 switch(family) {
 246                 case AF_INET:
 247                         tcp_trace(td->td_act, td->td_ostate,
 248                                   (struct tcpcb *)td->td_tcb,
 249                                   &td->td_cb, td->td_family, &td->td_ti.ti_i,
 250                                   &td->td_ti.ti_t, td->td_req);
 251                         break;
 252 #ifdef INET6
 253                 case AF_INET6:
 254                         tcp_trace(td->td_act, td->td_ostate,
 255                                   (struct tcpcb *)td->td_tcb,
 256                                   &td->td_cb, td->td_family, &td->td_ti6.ip6,
 257                                   &td->td_ti6.th, td->td_req);
 258                         break;
 259 #endif
 260                 }
 261                 if (i == tcp_debx)
 262                         goto done;
 263         }
 264         for (i = 0; i <= tcp_debx % TCP_NDEBUG; i++) {
 265                 td = &tcp_debug[i];
 266                 if (tcpcb && td->td_tcb != tcpcb)
 267                         continue;
 268                 ntime = ntohl(td->td_time);
 269 #ifdef INET6
 270                 family = td->td_family;
 271 #else
 272                 family = AF_INET;
 273 #endif
 274                 switch(family) {
 275                 case AF_INET:
 276                         tcp_trace(td->td_act, td->td_ostate,
 277                                   (struct tcpcb *)td->td_tcb,
 278                                   &td->td_cb, td->td_family, &td->td_ti.ti_i,
 279                                   &td->td_ti.ti_t, td->td_req);
 280                         break;
 281 #ifdef INET6
 282                 case AF_INET6:
 283                         tcp_trace(td->td_act, td->td_ostate,
 284                                   (struct tcpcb *)td->td_tcb,
 285                                   &td->td_cb, td->td_family, &td->td_ti6.ip6,
 286                                   &td->td_ti6.th, td->td_req);
 287                         break;
 288 #endif
 289                 }
 290         }
 291 done:   if (follow) {
 292                 prev_debx = tcp_debx + 1;
 293                 if (prev_debx >= TCP_NDEBUG)
 294                         prev_debx = 0;
 295                 do {
 296                         sleep(1);
 297                         (void)klseek(memf, (off_t)nl[N_TCP_DEBX].n_value, L_SET);
 298                         if (read(memf, (char *)&tcp_debx, sizeof(tcp_debx)) !=
 299                             sizeof(tcp_debx))
 300                                 err(3, "tcp_debx");
 301                 } while (tcp_debx == prev_debx);
 302                 (void)klseek(memf, (off_t)nl[N_TCP_DEBUG].n_value, L_SET);
 303                 if (read(memf, (char *)tcp_debug, sizeof(tcp_debug)) !=
 304                     sizeof(tcp_debug))
 305                         err(3, "tcp_debug");
 306                 goto again;
 307         }
 308 }
 309
 310 /*
 311  * Tcp debug routines
 312  */
 313 /*ARGSUSED*/
 314 void
 315 tcp_trace(act, ostate, atp, tp, family, ip, th, req)
 316         short act, ostate;
 317         struct tcpcb *atp, *tp;
 318         int family;
 319         void *ip;
 320         struct tcphdr *th;
 321         int req;
 322 {
 323         tcp_seq seq, ack;
 324         int flags, len, win, timer;
 325         struct ip *ip4;
 326 #ifdef INET6
 327         int isipv6, nopkt = 1;
 328         struct ip6_hdr *ip6;
 329         char ntop_buf[INET6_ADDRSTRLEN];
 330 #endif
 331
 332 #ifdef INET6
 333         switch (family) {
 334         case AF_INET:
 335                 nopkt = 0;
 336                 isipv6 = 0;
 337                 ip4 = (struct ip *)ip;
 338                 break;
 339         case AF_INET6:
 340                 nopkt = 0;
 341                 isipv6 = 1;
 342                 ip6 = (struct ip6_hdr *)ip;
 343         case 0:
 344         default:
 345                 break;
 346         }
 347 #else
 348         ip4 = (struct ip *)ip;
 349 #endif
 350         printf("%03ld %s:%s ",(ntime/10) % 1000, tcpstates[ostate],
 351             tanames[act]);
 352         switch (act) {
 353         case TA_INPUT:
 354         case TA_OUTPUT:
 355         case TA_DROP:
 356 #ifdef INET6
 357                 if (nopkt != 0)
 358                         break;
 359 #endif
 360                 if (aflag) {
 361                         printf("(src=%s,%u, ",
 362
 363 #ifdef INET6
 364                                isipv6
 365                                ? inet_ntop(AF_INET6, &ip6->ip6_src, ntop_buf,
 366                                            sizeof(ntop_buf)) :
 367 #endif
 368                                inet_ntoa(ip4->ip_src),
 369                                ntohs(th->th_sport));
 370                         printf("dst=%s,%u)",
 371 #ifdef INET6
 372                                isipv6
 373                                ? inet_ntop(AF_INET6, &ip6->ip6_dst, ntop_buf,
 374                                            sizeof(ntop_buf)) :
 375 #endif
 376                                inet_ntoa(ip4->ip_dst),
 377                                ntohs(th->th_dport));
 378                 }
 379                 seq = th->th_seq;
 380                 ack = th->th_ack;
 381
 382                 len =
 383 #ifdef INET6
 384                         isipv6 ? ip6->ip6_plen :
 385 #endif
 386                         ip4->ip_len;
 387                 win = th->th_win;
 388                 if (act == TA_OUTPUT) {
 389                         seq = ntohl(seq);
 390                         ack = ntohl(ack);
 391                         len = ntohs(len);
 392                         win = ntohs(win);
 393                 }
 394                 if (act == TA_OUTPUT)
 395                         len -= sizeof(struct tcphdr);
 396                 if (len)
 397                         printf("[%lx..%lx)", seq, seq + len);
 398                 else
 399                         printf("%lx", seq);
 400                 printf("@%lx", ack);
 401                 if (win)
 402                         printf("(win=%x)", win);
 403                 flags = th->th_flags;
 404                 if (flags) {
 405                         register char *cp = "<";
 406 #define pf(flag, string) { \
 407         if (th->th_flags&flag) { \
 408                 (void)printf("%s%s", cp, string); \
 409                 cp = ","; \
 410         } \
 411 }
 412                         pf(TH_SYN, "SYN");
 413                         pf(TH_ACK, "ACK");
 414                         pf(TH_FIN, "FIN");
 415                         pf(TH_RST, "RST");
 416                         pf(TH_PUSH, "PUSH");
 417                         pf(TH_URG, "URG");
 418                         printf(">");
 419                 }
 420                 break;
 421         case TA_USER:
 422                 timer = req >> 8;
 423                 req &= 0xff;
 424                 printf("%s", prurequests[req]);
 425                 if (req == PRU_SLOWTIMO || req == PRU_FASTTIMO)
 426                         printf("<%s>", tcptimers[timer]);
 427                 break;
 428         }
 429         printf(" -> %s", tcpstates[tp->t_state]);
 430         /* print out internal state of tp !?! */
 431         printf("\n");
 432         if (sflag) {
 433                 printf("\trcv_nxt %lx rcv_wnd %x snd_una %lx snd_nxt %lx snd_max %lx\n",
 434                     tp->rcv_nxt, tp->rcv_wnd, tp->snd_una, tp->snd_nxt,
 435                     tp->snd_max);
 436                 printf("\tsnd_wl1 %lx snd_wl2 %lx snd_wnd %x\n", tp->snd_wl1,
 437                     tp->snd_wl2, tp->snd_wnd);
 438         }
 439         /* print out timers? */
 440 #if 0
 441         /*
 442          * XXX
 443          * kernel now uses callouts, not integer time values.
 444          */
 445         if (tflag) {
 446                 register char *cp = "\t";
 447                 register int i;
 448
 449                 for (i = 0; i < TCPT_NTIMERS; i++) {
 450                         if (tp->t_timer[i] == 0)
 451                                 continue;
 452                         printf("%s%s=%d", cp, tcptimers[i], tp->t_timer[i]);
 453                         if (i == TCPT_REXMT)
 454                                 printf(" (t_rxtshft=%d)", tp->t_rxtshift);
 455                         cp = ", ";
 456                 }
 457                 if (*cp != '\t')
 458                         putchar('\n');
 459         }
 460 #endif
 461 }
 462
 463 int
 464 numeric(v1, v2)
 465         const void *v1, *v2;
 466 {
 467         const caddr_t *c1 = v1, *c2 = v2;
 468         return(*c1 - *c2);
 469 }
 470
 471 void
 472 klseek(fd, base, off)
 473         int fd, off;
 474         off_t base;
 475 {
 476         (void)lseek(fd, base, off);
 477 }