trpt.c revision 100165
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 35static 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 42static char sccsid[] = "@(#)trpt.c 8.1 (Berkeley) 6/6/93"; 43#endif 44static const char rcsid[] = 45 "$FreeBSD: head/usr.sbin/trpt/trpt.c 100165 2002-07-16 09:58:36Z des $"; 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 <string.h> 86#include <unistd.h> 87 88struct nlist nl[3]; 89#define N_TCP_DEBUG 0 90#define N_TCP_DEBX 1 91 92static caddr_t tcp_pcbs[TCP_NDEBUG]; 93static n_time ntime; 94static int aflag, kflag, memf, follow, sflag, tflag; 95 96void dotrace(caddr_t); 97void klseek(int, off_t, int); 98int numeric(const void *, const void *); 99void tcp_trace(short, short, struct tcpcb *, int, void *, struct tcphdr *, int); 100static void usage(void); 101 102int 103main(int argc, char **argv) 104{ 105 int ch, i, jflag, npcbs; 106 const char *core, *syst; 107 108 nl[0].n_name = strdup("_tcp_debug"); 109 nl[1].n_name = strdup("_tcp_debx"); 110 111 jflag = npcbs = 0; 112 while ((ch = getopt(argc, argv, "afjp:st")) != -1) 113 switch (ch) { 114 case 'a': 115 ++aflag; 116 break; 117 case 'f': 118 ++follow; 119 setlinebuf(stdout); 120 break; 121 case 'j': 122 ++jflag; 123 break; 124 case 'p': 125 if (npcbs >= TCP_NDEBUG) 126 errx(1, "too many pcb's specified"); 127 (void)sscanf(optarg, "%x", (int *)&tcp_pcbs[npcbs++]); 128 break; 129 case 's': 130 ++sflag; 131 break; 132 case 't': 133 ++tflag; 134 break; 135 case '?': 136 default: 137 usage(); 138 } 139 argc -= optind; 140 argv += optind; 141 142 core = _PATH_KMEM; 143 if (argc > 0) { 144 syst = *argv; 145 argc--, argv++; 146 if (argc > 0) { 147 core = *argv; 148 argc--, argv++; 149 ++kflag; 150 } 151 /* 152 * Discard setgid privileges if not the running kernel so that 153 * bad guys can't print interesting stuff from kernel memory. 154 */ 155 setgid(getgid()); 156 } 157 else 158 syst = getbootfile(); 159 160 if (nlist(syst, nl) < 0 || !nl[0].n_value) 161 errx(1, "%s: no namelist", syst); 162 if ((memf = open(core, O_RDONLY)) < 0) 163 err(2, "%s", core); 164 setgid(getgid()); 165 if (kflag) 166 errx(1, "can't do core files yet"); 167 (void)klseek(memf, (off_t)nl[N_TCP_DEBX].n_value, L_SET); 168 if (read(memf, (char *)&tcp_debx, sizeof(tcp_debx)) != 169 sizeof(tcp_debx)) 170 err(3, "tcp_debx"); 171 (void)klseek(memf, (off_t)nl[N_TCP_DEBUG].n_value, L_SET); 172 if (read(memf, (char *)tcp_debug, sizeof(tcp_debug)) != 173 sizeof(tcp_debug)) 174 err(3, "tcp_debug"); 175 /* 176 * If no control blocks have been specified, figure 177 * out how many distinct one we have and summarize 178 * them in tcp_pcbs for sorting the trace records 179 * below. 180 */ 181 if (!npcbs) { 182 for (i = 0; i < TCP_NDEBUG; i++) { 183 register struct tcp_debug *td = &tcp_debug[i]; 184 register int j; 185 186 if (td->td_tcb == 0) 187 continue; 188 for (j = 0; j < npcbs; j++) 189 if (tcp_pcbs[j] == td->td_tcb) 190 break; 191 if (j >= npcbs) 192 tcp_pcbs[npcbs++] = td->td_tcb; 193 } 194 if (!npcbs) 195 exit(0); 196 } 197 qsort(tcp_pcbs, npcbs, sizeof(caddr_t), numeric); 198 if (jflag) { 199 for (i = 0;;) { 200 printf("%p", (void *)tcp_pcbs[i]); 201 if (++i == npcbs) 202 break; 203 fputs(", ", stdout); 204 } 205 putchar('\n'); 206 } 207 else for (i = 0; i < npcbs; i++) { 208 printf("\n%p:\n", tcp_pcbs[i]); 209 dotrace(tcp_pcbs[i]); 210 } 211 exit(0); 212} 213 214static void 215usage() 216{ 217 (void)fprintf(stderr, 218 "usage: trpt [-afjst] [-p hex-address] [system [core]]\n"); 219 exit(1); 220} 221 222void 223dotrace(tcpcb) 224 register caddr_t tcpcb; 225{ 226 register struct tcp_debug *td; 227 register int i; 228 int prev_debx = tcp_debx, family; 229 230again: if (--tcp_debx < 0) 231 tcp_debx = TCP_NDEBUG - 1; 232 for (i = prev_debx % TCP_NDEBUG; i < TCP_NDEBUG; i++) { 233 td = &tcp_debug[i]; 234 if (tcpcb && td->td_tcb != tcpcb) 235 continue; 236 ntime = ntohl(td->td_time); 237#ifdef INET6 238 family = td->td_family; 239#else 240 family = AF_INET; 241#endif 242 switch(family) { 243 case AF_INET: 244 tcp_trace(td->td_act, td->td_ostate, 245 &td->td_cb, td->td_family, &td->td_ti.ti_i, 246 &td->td_ti.ti_t, td->td_req); 247 break; 248#ifdef INET6 249 case AF_INET6: 250 tcp_trace(td->td_act, td->td_ostate, 251 &td->td_cb, td->td_family, &td->td_ti6.ip6, 252 &td->td_ti6.th, td->td_req); 253 break; 254#endif 255 } 256 if (i == tcp_debx) 257 goto done; 258 } 259 for (i = 0; i <= tcp_debx % TCP_NDEBUG; i++) { 260 td = &tcp_debug[i]; 261 if (tcpcb && td->td_tcb != tcpcb) 262 continue; 263 ntime = ntohl(td->td_time); 264#ifdef INET6 265 family = td->td_family; 266#else 267 family = AF_INET; 268#endif 269 switch(family) { 270 case AF_INET: 271 tcp_trace(td->td_act, td->td_ostate, 272 &td->td_cb, td->td_family, &td->td_ti.ti_i, 273 &td->td_ti.ti_t, td->td_req); 274 break; 275#ifdef INET6 276 case AF_INET6: 277 tcp_trace(td->td_act, td->td_ostate, 278 &td->td_cb, td->td_family, &td->td_ti6.ip6, 279 &td->td_ti6.th, td->td_req); 280 break; 281#endif 282 } 283 } 284done: if (follow) { 285 prev_debx = tcp_debx + 1; 286 if (prev_debx >= TCP_NDEBUG) 287 prev_debx = 0; 288 do { 289 sleep(1); 290 (void)klseek(memf, (off_t)nl[N_TCP_DEBX].n_value, L_SET); 291 if (read(memf, (char *)&tcp_debx, sizeof(tcp_debx)) != 292 sizeof(tcp_debx)) 293 err(3, "tcp_debx"); 294 } while (tcp_debx == prev_debx); 295 (void)klseek(memf, (off_t)nl[N_TCP_DEBUG].n_value, L_SET); 296 if (read(memf, (char *)tcp_debug, sizeof(tcp_debug)) != 297 sizeof(tcp_debug)) 298 err(3, "tcp_debug"); 299 goto again; 300 } 301} 302 303/* 304 * Tcp debug routines 305 */ 306/*ARGSUSED*/ 307void 308tcp_trace(act, ostate, tp, family, ip, th, req) 309 short act, ostate; 310 struct tcpcb *tp; 311 int family; 312 void *ip; 313 struct tcphdr *th; 314 int req; 315{ 316 tcp_seq seq, ack; 317 int flags, len, win, timer; 318 struct ip *ip4; 319#ifdef INET6 320 int isipv6, nopkt = 1; 321 struct ip6_hdr *ip6; 322 char ntop_buf[INET6_ADDRSTRLEN]; 323#endif 324 325#ifdef INET6 326 switch (family) { 327 case AF_INET: 328 nopkt = 0; 329 isipv6 = 0; 330 ip4 = (struct ip *)ip; 331 break; 332 case AF_INET6: 333 nopkt = 0; 334 isipv6 = 1; 335 ip6 = (struct ip6_hdr *)ip; 336 case 0: 337 default: 338 break; 339 } 340#else 341 ip4 = (struct ip *)ip; 342#endif 343 printf("%03ld %s:%s ", (long)((ntime/10) % 1000), tcpstates[ostate], 344 tanames[act]); 345 switch (act) { 346 case TA_INPUT: 347 case TA_OUTPUT: 348 case TA_DROP: 349#ifdef INET6 350 if (nopkt != 0) 351 break; 352#endif 353 if (aflag) { 354 printf("(src=%s,%u, ", 355 356#ifdef INET6 357 isipv6 358 ? inet_ntop(AF_INET6, &ip6->ip6_src, ntop_buf, 359 sizeof(ntop_buf)) : 360#endif 361 inet_ntoa(ip4->ip_src), 362 ntohs(th->th_sport)); 363 printf("dst=%s,%u)", 364#ifdef INET6 365 isipv6 366 ? inet_ntop(AF_INET6, &ip6->ip6_dst, ntop_buf, 367 sizeof(ntop_buf)) : 368#endif 369 inet_ntoa(ip4->ip_dst), 370 ntohs(th->th_dport)); 371 } 372 seq = th->th_seq; 373 ack = th->th_ack; 374 375 len = 376#ifdef INET6 377 isipv6 ? ip6->ip6_plen : 378#endif 379 ip4->ip_len; 380 win = th->th_win; 381 if (act == TA_OUTPUT) { 382 seq = ntohl(seq); 383 ack = ntohl(ack); 384 len = ntohs(len); 385 win = ntohs(win); 386 } 387 if (act == TA_OUTPUT) 388 len -= sizeof(struct tcphdr); 389 if (len) 390 printf("[%lx..%lx)", (u_long)seq, (u_long)(seq + len)); 391 else 392 printf("%lx", (u_long)seq); 393 printf("@%lx", (u_long)ack); 394 if (win) 395 printf("(win=%x)", win); 396 flags = th->th_flags; 397 if (flags) { 398 const char *cp = "<"; 399#define pf(flag, string) { \ 400 if (th->th_flags&flag) { \ 401 (void)printf("%s%s", cp, string); \ 402 cp = ","; \ 403 } \ 404} 405 pf(TH_SYN, "SYN"); 406 pf(TH_ACK, "ACK"); 407 pf(TH_FIN, "FIN"); 408 pf(TH_RST, "RST"); 409 pf(TH_PUSH, "PUSH"); 410 pf(TH_URG, "URG"); 411 printf(">"); 412 } 413 break; 414 case TA_USER: 415 timer = req >> 8; 416 req &= 0xff; 417 printf("%s", prurequests[req]); 418 if (req == PRU_SLOWTIMO || req == PRU_FASTTIMO) 419 printf("<%s>", tcptimers[timer]); 420 break; 421 } 422 printf(" -> %s", tcpstates[tp->t_state]); 423 /* print out internal state of tp !?! */ 424 printf("\n"); 425 if (sflag) { 426 printf("\trcv_nxt %lx rcv_wnd %lx snd_una %lx snd_nxt %lx snd_max %lx\n", 427 (u_long)tp->rcv_nxt, tp->rcv_wnd, 428 (u_long)tp->snd_una, (u_long)tp->snd_nxt, 429 (u_long)tp->snd_max); 430 printf("\tsnd_wl1 %lx snd_wl2 %lx snd_wnd %lx\n", 431 (u_long)tp->snd_wl1, 432 (u_long)tp->snd_wl2, tp->snd_wnd); 433 } 434 /* print out timers? */ 435#if 0 436 /* 437 * XXX 438 * kernel now uses callouts, not integer time values. 439 */ 440 if (tflag) { 441 register char *cp = "\t"; 442 register int i; 443 444 for (i = 0; i < TCPT_NTIMERS; i++) { 445 if (tp->t_timer[i] == 0) 446 continue; 447 printf("%s%s=%d", cp, tcptimers[i], tp->t_timer[i]); 448 if (i == TCPT_REXMT) 449 printf(" (t_rxtshft=%d)", tp->t_rxtshift); 450 cp = ", "; 451 } 452 if (*cp != '\t') 453 putchar('\n'); 454 } 455#endif 456} 457 458int 459numeric(v1, v2) 460 const void *v1, *v2; 461{ 462 const caddr_t *c1 = v1, *c2 = v2; 463 return(*c1 - *c2); 464} 465 466void 467klseek(fd, base, off) 468 int fd, off; 469 off_t base; 470{ 471 (void)lseek(fd, base, off); 472} 473