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. 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 #define _WANT_TCPCB
  70 #include <netinet/tcp_var.h>
  71 #include <netinet/tcpip.h>
  72 #define TANAMES
  73 #include <netinet/tcp_debug.h>
  74
  75 #include <arpa/inet.h>
  76
  77 #include <err.h>
  78 #include <nlist.h>
  79 #include <paths.h>
  80 #include <stdio.h>
  81 #include <stdlib.h>
  82 #include <string.h>
  83 #include <unistd.h>
  84
  85 struct nlist nl[3];
  86 #define N_TCP_DEBUG     0
  87 #define N_TCP_DEBX      1
  88
  89 static caddr_t tcp_pcbs[TCP_NDEBUG];
  90 static n_time ntime;
  91 static int aflag, kflag, memf, follow, sflag, tflag;
  92
  93 void dotrace(caddr_t);
  94 void klseek(int, off_t, int);
  95 int numeric(const void *, const void *);
  96 void tcp_trace(short, short, struct tcpcb *, int, void *, struct tcphdr *, int);
  97 static void usage(void);
  98
  99 int
 100 main(int argc, char **argv)
 101 {
 102         int ch, i, jflag, npcbs;
 103         const char *core, *syst;
 104
 105         nl[0].n_name = strdup("_tcp_debug");
 106         nl[1].n_name = strdup("_tcp_debx");
 107
 108         jflag = npcbs = 0;
 109         while ((ch = getopt(argc, argv, "afjp:st")) != -1)
 110                 switch (ch) {
 111                 case 'a':
 112                         ++aflag;
 113                         break;
 114                 case 'f':
 115                         ++follow;
 116                         setlinebuf(stdout);
 117                         break;
 118                 case 'j':
 119                         ++jflag;
 120                         break;
 121                 case 'p':
 122                         if (npcbs >= TCP_NDEBUG)
 123                                 errx(1, "too many pcb's specified");
 124                         (void)sscanf(optarg, "%x", (int *)&tcp_pcbs[npcbs++]);
 125                         break;
 126                 case 's':
 127                         ++sflag;
 128                         break;
 129                 case 't':
 130                         ++tflag;
 131                         break;
 132                 case '?':
 133                 default:
 134                         usage();
 135                 }
 136         argc -= optind;
 137         argv += optind;
 138
 139         core = _PATH_KMEM;
 140         if (argc > 0) {
 141                 syst = *argv;
 142                 argc--, argv++;
 143                 if (argc > 0) {
 144                         core = *argv;
 145                         argc--, argv++;
 146                         ++kflag;
 147                 }
 148                 /*
 149                  * Discard setgid privileges if not the running kernel so that
 150                  * bad guys can't print interesting stuff from kernel memory.
 151                  */
 152                 if (setgid(getgid()) != 0)
 153                         err(1, "setgid");
 154         }
 155         else
 156                 syst = getbootfile();
 157
 158         if (nlist(syst, nl) < 0 || !nl[0].n_value)
 159                 errx(1, "%s: no namelist", syst);
 160         if ((memf = open(core, O_RDONLY)) < 0)
 161                 err(2, "%s", core);
 162         if (setgid(getgid()) != 0)
 163                 err(1, "setgid");
 164         if (kflag)
 165                 errx(1, "can't do core files yet");
 166         (void)klseek(memf, (off_t)nl[N_TCP_DEBX].n_value, L_SET);
 167         if (read(memf, (char *)&tcp_debx, sizeof(tcp_debx)) !=
 168             sizeof(tcp_debx))
 169                 err(3, "tcp_debx");
 170         (void)klseek(memf, (off_t)nl[N_TCP_DEBUG].n_value, L_SET);
 171         if (read(memf, (char *)tcp_debug, sizeof(tcp_debug)) !=
 172             sizeof(tcp_debug))
 173                 err(3, "tcp_debug");
 174         /*
 175          * If no control blocks have been specified, figure
 176          * out how many distinct one we have and summarize
 177          * them in tcp_pcbs for sorting the trace records
 178          * below.
 179          */
 180         if (!npcbs) {
 181                 for (i = 0; i < TCP_NDEBUG; i++) {
 182                         register struct tcp_debug *td = &tcp_debug[i];
 183                         register int j;
 184
 185                         if (td->td_tcb == 0)
 186                                 continue;
 187                         for (j = 0; j < npcbs; j++)
 188                                 if (tcp_pcbs[j] == td->td_tcb)
 189                                         break;
 190                         if (j >= npcbs)
 191                                 tcp_pcbs[npcbs++] = td->td_tcb;
 192                 }
 193                 if (!npcbs)
 194                         exit(0);
 195         }
 196         qsort(tcp_pcbs, npcbs, sizeof(caddr_t), numeric);
 197         if (jflag) {
 198                 for (i = 0;;) {
 199                         printf("%p", (void *)tcp_pcbs[i]);
 200                         if (++i == npcbs)
 201                                 break;
 202                         fputs(", ", stdout);
 203                 }
 204                 putchar('\n');
 205         }
 206         else for (i = 0; i < npcbs; i++) {
 207                 printf("\n%p:\n", tcp_pcbs[i]);
 208                 dotrace(tcp_pcbs[i]);
 209         }
 210         exit(0);
 211 }
 212
 213 static void
 214 usage()
 215 {
 216         (void)fprintf(stderr,
 217                 "usage: trpt [-afjst] [-p hex-address] [system [core]]\n");
 218         exit(1);
 219 }
 220
 221 void
 222 dotrace(tcpcb)
 223         register caddr_t tcpcb;
 224 {
 225         register struct tcp_debug *td;
 226         register int i;
 227         int prev_debx = tcp_debx, family;
 228
 229 again:  if (--tcp_debx < 0)
 230                 tcp_debx = TCP_NDEBUG - 1;
 231         for (i = prev_debx % TCP_NDEBUG; i < TCP_NDEBUG; i++) {
 232                 td = &tcp_debug[i];
 233                 if (tcpcb && td->td_tcb != tcpcb)
 234                         continue;
 235                 ntime = ntohl(td->td_time);
 236 #ifdef INET6
 237                 family = td->td_family;
 238 #else
 239                 family = AF_INET;
 240 #endif
 241                 switch(family) {
 242                 case AF_INET:
 243                         tcp_trace(td->td_act, td->td_ostate,
 244                                   &td->td_cb, td->td_family, &td->td_ti.ti_i,
 245                                   &td->td_ti.ti_t, td->td_req);
 246                         break;
 247 #ifdef INET6
 248                 case AF_INET6:
 249                         tcp_trace(td->td_act, td->td_ostate,
 250                                   &td->td_cb, td->td_family, &td->td_ti6.ip6,
 251                                   &td->td_ti6.th, td->td_req);
 252                         break;
 253 #endif
 254                 }
 255                 if (i == tcp_debx)
 256                         goto done;
 257         }
 258         for (i = 0; i <= tcp_debx % TCP_NDEBUG; i++) {
 259                 td = &tcp_debug[i];
 260                 if (tcpcb && td->td_tcb != tcpcb)
 261                         continue;
 262                 ntime = ntohl(td->td_time);
 263 #ifdef INET6
 264                 family = td->td_family;
 265 #else
 266                 family = AF_INET;
 267 #endif
 268                 switch(family) {
 269                 case AF_INET:
 270                         tcp_trace(td->td_act, td->td_ostate,
 271                                   &td->td_cb, td->td_family, &td->td_ti.ti_i,
 272                                   &td->td_ti.ti_t, td->td_req);
 273                         break;
 274 #ifdef INET6
 275                 case AF_INET6:
 276                         tcp_trace(td->td_act, td->td_ostate,
 277                                   &td->td_cb, td->td_family, &td->td_ti6.ip6,
 278                                   &td->td_ti6.th, td->td_req);
 279                         break;
 280 #endif
 281                 }
 282         }
 283 done:   if (follow) {
 284                 prev_debx = tcp_debx + 1;
 285                 if (prev_debx >= TCP_NDEBUG)
 286                         prev_debx = 0;
 287                 do {
 288                         sleep(1);
 289                         (void)klseek(memf, (off_t)nl[N_TCP_DEBX].n_value, L_SET);
 290                         if (read(memf, (char *)&tcp_debx, sizeof(tcp_debx)) !=
 291                             sizeof(tcp_debx))
 292                                 err(3, "tcp_debx");
 293                 } while (tcp_debx == prev_debx);
 294                 (void)klseek(memf, (off_t)nl[N_TCP_DEBUG].n_value, L_SET);
 295                 if (read(memf, (char *)tcp_debug, sizeof(tcp_debug)) !=
 296                     sizeof(tcp_debug))
 297                         err(3, "tcp_debug");
 298                 goto again;
 299         }
 300 }
 301
 302 /*
 303  * Tcp debug routines
 304  */
 305 /*ARGSUSED*/
 306 void
 307 tcp_trace(short act, short ostate, struct tcpcb *tp, int family __unused,
 308     void *ip, struct tcphdr *th, int req)
 309 {
 310         tcp_seq seq, ack;
 311         int flags, len, win, timer;
 312         struct ip *ip4;
 313 #ifdef INET6
 314         int isipv6, nopkt = 1;
 315         struct ip6_hdr *ip6;
 316         char ntop_buf[INET6_ADDRSTRLEN];
 317 #endif
 318
 319 #ifdef INET6
 320         switch (family) {
 321         case AF_INET:
 322                 nopkt = 0;
 323                 isipv6 = 0;
 324                 ip4 = (struct ip *)ip;
 325                 break;
 326         case AF_INET6:
 327                 nopkt = 0;
 328                 isipv6 = 1;
 329                 ip6 = (struct ip6_hdr *)ip;
 330         case 0:
 331         default:
 332                 break;
 333         }
 334 #else
 335         ip4 = (struct ip *)ip;
 336 #endif
 337         printf("%03ld %s:%s ", (long)((ntime/10) % 1000), tcpstates[ostate],
 338             tanames[act]);
 339         switch (act) {
 340         case TA_INPUT:
 341         case TA_OUTPUT:
 342         case TA_DROP:
 343 #ifdef INET6
 344                 if (nopkt != 0)
 345                         break;
 346 #endif
 347                 if (aflag) {
 348                         printf("(src=%s,%u, ",
 349
 350 #ifdef INET6
 351                                isipv6
 352                                ? inet_ntop(AF_INET6, &ip6->ip6_src, ntop_buf,
 353                                            sizeof(ntop_buf)) :
 354 #endif
 355                                inet_ntoa(ip4->ip_src),
 356                                ntohs(th->th_sport));
 357                         printf("dst=%s,%u)",
 358 #ifdef INET6
 359                                isipv6
 360                                ? inet_ntop(AF_INET6, &ip6->ip6_dst, ntop_buf,
 361                                            sizeof(ntop_buf)) :
 362 #endif
 363                                inet_ntoa(ip4->ip_dst),
 364                                ntohs(th->th_dport));
 365                 }
 366                 seq = th->th_seq;
 367                 ack = th->th_ack;
 368
 369                 len =
 370 #ifdef INET6
 371                         isipv6 ? ip6->ip6_plen :
 372 #endif
 373                         ip4->ip_len;
 374                 win = th->th_win;
 375                 if (act == TA_OUTPUT) {
 376                         seq = ntohl(seq);
 377                         ack = ntohl(ack);
 378                         len = ntohs(len);
 379                         win = ntohs(win);
 380                 }
 381                 if (act == TA_OUTPUT)
 382                         len -= sizeof(struct tcphdr);
 383                 if (len)
 384                         printf("[%lx..%lx)", (u_long)seq, (u_long)(seq + len));
 385                 else
 386                         printf("%lx", (u_long)seq);
 387                 printf("@%lx", (u_long)ack);
 388                 if (win)
 389                         printf("(win=%x)", win);
 390                 flags = th->th_flags;
 391                 if (flags) {
 392                         const char *cp = "<";
 393 #define pf(flag, string) { \
 394         if (th->th_flags&flag) { \
 395                 (void)printf("%s%s", cp, string); \
 396                 cp = ","; \
 397         } \
 398 }
 399                         pf(TH_SYN, "SYN");
 400                         pf(TH_ACK, "ACK");
 401                         pf(TH_FIN, "FIN");
 402                         pf(TH_RST, "RST");
 403                         pf(TH_PUSH, "PUSH");
 404                         pf(TH_URG, "URG");
 405                         printf(">");
 406                 }
 407                 break;
 408         case TA_USER:
 409                 timer = req >> 8;
 410                 req &= 0xff;
 411                 printf("%s", prurequests[req]);
 412                 if (req == PRU_SLOWTIMO || req == PRU_FASTTIMO)
 413                         printf("<%s>", tcptimers[timer]);
 414                 break;
 415         }
 416         printf(" -> %s", tcpstates[tp->t_state]);
 417         /* print out internal state of tp !?! */
 418         printf("\n");
 419         if (sflag) {
 420                 printf("\trcv_nxt %lx rcv_wnd %lx snd_una %lx snd_nxt %lx snd_max %lx\n",
 421                     (u_long)tp->rcv_nxt, (u_long)tp->rcv_wnd,
 422                     (u_long)tp->snd_una, (u_long)tp->snd_nxt,
 423                     (u_long)tp->snd_max);
 424                 printf("\tsnd_wl1 %lx snd_wl2 %lx snd_wnd %lx\n",
 425                     (u_long)tp->snd_wl1,
 426                     (u_long)tp->snd_wl2, (u_long)tp->snd_wnd);
 427         }
 428         /* print out timers? */
 429 #if 0
 430         /*
 431          * XXX
 432          * kernel now uses callouts, not integer time values.
 433          */
 434         if (tflag) {
 435                 register char *cp = "\t";
 436                 register int i;
 437
 438                 for (i = 0; i < TCPT_NTIMERS; i++) {
 439                         if (tp->t_timer[i] == 0)
 440                                 continue;
 441                         printf("%s%s=%d", cp, tcptimers[i], tp->t_timer[i]);
 442                         if (i == TCPT_REXMT)
 443                                 printf(" (t_rxtshft=%d)", tp->t_rxtshift);
 444                         cp = ", ";
 445                 }
 446                 if (*cp != '\t')
 447                         putchar('\n');
 448         }
 449 #endif
 450 }
 451
 452 int
 453 numeric(v1, v2)
 454         const void *v1, *v2;
 455 {
 456         const caddr_t *c1 = v1, *c2 = v2;
 457         return(*c1 - *c2);
 458 }
 459
 460 void
 461 klseek(fd, base, off)
 462         int fd, off;
 463         off_t base;
 464 {
 465         (void)lseek(fd, base, off);
 466 }