1 /* $OpenBSD: trpt.c,v 1.28 2011/07/04 07:06:49 guenther Exp $ */ 2 3 /*- 4 * Copyright (c) 1997 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1983, 1988, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 */ 61 62 #include <sys/param.h> 63 #include <sys/queue.h> 64 #include <sys/socket.h> 65 #define PRUREQUESTS 66 #include <sys/protosw.h> 67 #define _KERNEL 68 #include <sys/timeout.h> /* to get timeout_pending() and such */ 69 #undef _KERNEL 70 #include <sys/file.h> 71 72 #include <net/route.h> 73 #include <net/if.h> 74 75 #include <netinet/in.h> 76 #include <netinet/in_systm.h> 77 #include <netinet/ip.h> 78 #include <netinet/in_pcb.h> 79 #include <netinet/ip_var.h> 80 #include <netinet/tcp.h> 81 #define TCPSTATES 82 #include <netinet/tcp_fsm.h> 83 #include <netinet/tcp_seq.h> 84 #define TCPTIMERS 85 #include <netinet/tcp_timer.h> 86 #include <netinet/tcp_var.h> 87 #include <netinet/tcpip.h> 88 #define TANAMES 89 #include <netinet/tcp_debug.h> 90 91 #include <arpa/inet.h> 92 93 #include <err.h> 94 #include <stdio.h> 95 #include <errno.h> 96 #include <kvm.h> 97 #include <nlist.h> 98 #include <paths.h> 99 #include <limits.h> 100 #include <stdlib.h> 101 #include <unistd.h> 102 103 struct nlist nl[] = { 104 #define N_TCP_DEBUG 0 /* no sysctl */ 105 { "_tcp_debug" }, 106 #define N_TCP_DEBX 1 /* no sysctl */ 107 { "_tcp_debx" }, 108 { NULL }, 109 }; 110 111 int tcp_debx; 112 struct tcp_debug tcp_debug[TCP_NDEBUG]; 113 114 static caddr_t tcp_pcbs[TCP_NDEBUG]; 115 static n_time ntime; 116 static int aflag, follow, sflag, tflag; 117 118 extern char *__progname; 119 120 void dotrace(caddr_t); 121 void tcp_trace(short, short, struct tcpcb *, struct tcpiphdr *, 122 struct tcpipv6hdr *, int); 123 int numeric(const void *, const void *); 124 void usage(void); 125 126 kvm_t *kd; 127 128 int 129 main(int argc, char *argv[]) 130 { 131 char *sys = NULL, *core = NULL, *cp, errbuf[_POSIX2_LINE_MAX]; 132 int ch, i, jflag = 0, npcbs = 0; 133 unsigned long l; 134 gid_t gid; 135 136 while ((ch = getopt(argc, argv, "afjM:N:p:st")) != -1) { 137 switch (ch) { 138 case 'a': 139 ++aflag; 140 break; 141 case 'f': 142 ++follow; 143 setlinebuf(stdout); 144 break; 145 case 'j': 146 ++jflag; 147 break; 148 case 'p': 149 if (npcbs >= TCP_NDEBUG) 150 errx(1, "too many pcbs specified"); 151 errno = 0; 152 l = strtoul(optarg, &cp, 16); 153 tcp_pcbs[npcbs] = (caddr_t)l; 154 if (*optarg == '\0' || *cp != '\0' || errno || 155 (unsigned long)tcp_pcbs[npcbs] != l) 156 errx(1, "invalid address: %s", optarg); 157 npcbs++; 158 break; 159 case 's': 160 ++sflag; 161 break; 162 case 't': 163 ++tflag; 164 break; 165 case 'N': 166 sys = optarg; 167 break; 168 case 'M': 169 core = optarg; 170 break; 171 default: 172 usage(); 173 /* NOTREACHED */ 174 } 175 } 176 argc -= optind; 177 argv += optind; 178 179 if (argc) 180 usage(); 181 182 /* 183 * Discard setgid privileged if not the running kernel so that bad 184 * guys can't print interesting stuff from kernel memory. 185 */ 186 gid = getgid(); 187 if (core != NULL || sys != NULL) 188 if (setresgid(gid, gid, gid) == -1) 189 err(1, "setresgid"); 190 191 kd = kvm_openfiles(sys, core, NULL, O_RDONLY, errbuf); 192 if (kd == NULL) 193 errx(1, "can't open kmem: %s", errbuf); 194 195 if (core == NULL && sys == NULL) 196 if (setresgid(gid, gid, gid) == -1) 197 err(1, "setresgid"); 198 199 if (kvm_nlist(kd, nl)) 200 errx(2, "%s: no namelist", sys ? sys : _PATH_UNIX); 201 202 if (kvm_read(kd, nl[N_TCP_DEBX].n_value, (char *)&tcp_debx, 203 sizeof(tcp_debx)) != sizeof(tcp_debx)) 204 errx(3, "tcp_debx: %s", kvm_geterr(kd)); 205 206 if (kvm_read(kd, nl[N_TCP_DEBUG].n_value, (char *)tcp_debug, 207 sizeof(tcp_debug)) != sizeof(tcp_debug)) 208 errx(3, "tcp_debug: %s", kvm_geterr(kd)); 209 210 /* 211 * If no control blocks have been specified, figure 212 * out how many distinct one we have and summarize 213 * them in tcp_pcbs for sorting the trace records 214 * below. 215 */ 216 if (npcbs == 0) { 217 for (i = 0; i < TCP_NDEBUG; i++) { 218 struct tcp_debug *td = &tcp_debug[i]; 219 int j; 220 221 if (td->td_tcb == 0) 222 continue; 223 for (j = 0; j < npcbs; j++) 224 if (tcp_pcbs[j] == td->td_tcb) 225 break; 226 if (j >= npcbs) 227 tcp_pcbs[npcbs++] = td->td_tcb; 228 } 229 if (npcbs == 0) 230 exit(0); 231 } 232 qsort(tcp_pcbs, npcbs, sizeof(caddr_t), numeric); 233 if (jflag) { 234 for (i = 0;;) { 235 printf("%lx", (long)tcp_pcbs[i]); 236 if (++i == npcbs) 237 break; 238 fputs(", ", stdout); 239 } 240 putchar('\n'); 241 } else { 242 for (i = 0; i < npcbs; i++) { 243 printf("\n%lx:\n", (long)tcp_pcbs[i]); 244 dotrace(tcp_pcbs[i]); 245 } 246 } 247 exit(0); 248 } 249 250 void 251 dotrace(caddr_t tcpcb) 252 { 253 struct tcp_debug *td; 254 int prev_debx = tcp_debx; 255 int i; 256 257 again: 258 if (--tcp_debx < 0) 259 tcp_debx = TCP_NDEBUG - 1; 260 for (i = prev_debx % TCP_NDEBUG; i < TCP_NDEBUG; i++) { 261 td = &tcp_debug[i]; 262 if (tcpcb && td->td_tcb != tcpcb) 263 continue; 264 ntime = ntohl(td->td_time); 265 tcp_trace(td->td_act, td->td_ostate, 266 &td->td_cb, &td->td_ti, 267 &td->td_ti6, td->td_req); 268 if (i == tcp_debx) 269 goto done; 270 } 271 for (i = 0; i <= tcp_debx % TCP_NDEBUG; i++) { 272 td = &tcp_debug[i]; 273 if (tcpcb && td->td_tcb != tcpcb) 274 continue; 275 ntime = ntohl(td->td_time); 276 tcp_trace(td->td_act, td->td_ostate, 277 &td->td_cb, &td->td_ti, 278 &td->td_ti6, td->td_req); 279 } 280 done: 281 if (follow) { 282 prev_debx = tcp_debx + 1; 283 if (prev_debx >= TCP_NDEBUG) 284 prev_debx = 0; 285 do { 286 sleep(1); 287 if (kvm_read(kd, nl[N_TCP_DEBX].n_value, 288 (char *)&tcp_debx, sizeof(tcp_debx)) != 289 sizeof(tcp_debx)) 290 errx(3, "tcp_debx: %s", kvm_geterr(kd)); 291 } while (tcp_debx == prev_debx); 292 293 if (kvm_read(kd, nl[N_TCP_DEBUG].n_value, (char *)tcp_debug, 294 sizeof(tcp_debug)) != sizeof(tcp_debug)) 295 errx(3, "tcp_debug: %s", kvm_geterr(kd)); 296 297 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, 307 struct tcpiphdr *ti, struct tcpipv6hdr *ti6, int req) 308 { 309 tcp_seq seq, ack; 310 int flags, len, win, timer; 311 struct tcphdr *th; 312 char hbuf[INET6_ADDRSTRLEN]; 313 314 if (ti->ti_src.s_addr) 315 th = &ti->ti_t; 316 else 317 th = &ti6->ti6_t; 318 319 printf("%03d %s:%s ", (ntime/10) % 1000, tcpstates[ostate], 320 tanames[act]); 321 switch (act) { 322 case TA_INPUT: 323 case TA_OUTPUT: 324 case TA_DROP: 325 if (aflag) { 326 if (ti->ti_src.s_addr) { 327 printf("(src=%s,%u, ", 328 inet_ntoa(ti->ti_src), ntohs(ti->ti_sport)); 329 printf("dst=%s,%u)", 330 inet_ntoa(ti->ti_dst), ntohs(ti->ti_dport)); 331 } else { 332 printf("(src=%s,%u, ", 333 inet_ntop(AF_INET6, &ti6->ti6_src, 334 hbuf, sizeof(hbuf)), ntohs(ti->ti_sport)); 335 printf("dst=%s,%u)", 336 inet_ntop(AF_INET6, &ti6->ti6_dst, 337 hbuf, sizeof(hbuf)), ntohs(ti->ti_dport)); 338 } 339 } 340 seq = th->th_seq; 341 ack = th->th_ack; 342 if (ti->ti_src.s_addr) 343 len = ti->ti_len; 344 else 345 len = ti6->ti6_plen; /*XXX intermediate header*/ 346 win = th->th_win; 347 if (act == TA_OUTPUT) { 348 NTOHL(seq); 349 NTOHL(ack); 350 NTOHS(win); 351 } 352 if (len) 353 printf("[%x..%x)", seq, seq + len); 354 else 355 printf("%x", seq); 356 printf("@%x", ack); 357 if (win) 358 printf("(win=%x)", win); 359 flags = th->th_flags; 360 if (flags) { 361 char *cp = "<"; 362 #define pf(flag, string) { \ 363 if (th->th_flags & flag) { \ 364 (void)printf("%s%s", cp, string); \ 365 cp = ","; \ 366 } \ 367 } 368 pf(TH_SYN, "SYN"); 369 pf(TH_ACK, "ACK"); 370 pf(TH_FIN, "FIN"); 371 pf(TH_RST, "RST"); 372 pf(TH_PUSH, "PUSH"); 373 pf(TH_URG, "URG"); 374 printf(">"); 375 } 376 break; 377 case TA_USER: 378 timer = req >> 8; 379 req &= 0xff; 380 printf("%s", prurequests[req]); 381 if (req == PRU_SLOWTIMO || req == PRU_FASTTIMO) 382 printf("<%s>", tcptimers[timer]); 383 break; 384 } 385 printf(" -> %s", tcpstates[tp->t_state]); 386 /* print out internal state of tp !?! */ 387 printf("\n"); 388 if (sflag) { 389 printf("\trcv_nxt %x rcv_wnd %lx snd_una %x snd_nxt %x snd_max %x\n", 390 tp->rcv_nxt, tp->rcv_wnd, tp->snd_una, tp->snd_nxt, 391 tp->snd_max); 392 printf("\tsnd_wl1 %x snd_wl2 %x snd_wnd %lx\n", tp->snd_wl1, 393 tp->snd_wl2, tp->snd_wnd); 394 } 395 /* print out timers? */ 396 if (tflag) { 397 char *cp = "\t"; 398 int i; 399 400 for (i = 0; i < TCPT_NTIMERS; i++) { 401 if (timeout_pending(&tp->t_timer[i])) 402 continue; 403 printf("%s%s=%d", cp, tcptimers[i], 404 tp->t_timer[i].to_time); 405 if (i == TCPT_REXMT) 406 printf(" (t_rxtshft=%d)", tp->t_rxtshift); 407 cp = ", "; 408 } 409 if (*cp != '\t') 410 putchar('\n'); 411 } 412 } 413 414 int 415 numeric(const void *v1, const void *v2) 416 { 417 const caddr_t *c1 = v1; 418 const caddr_t *c2 = v2; 419 int rv; 420 421 if (*c1 < *c2) 422 rv = -1; 423 else if (*c1 > *c2) 424 rv = 1; 425 else 426 rv = 0; 427 428 return (rv); 429 } 430 431 void 432 usage(void) 433 { 434 435 (void) fprintf(stderr, "usage: %s [-afjst] [-M core]" 436 " [-N system] [-p hex-address]\n", __progname); 437 exit(1); 438 } 439