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