dist/dhcp/omapip/mrtrace.c

   1 /* mrtrace.c
   2
   3    Subroutines that support minires tracing... */
   4
   5 /*
   6  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
   7  * Copyright (c) 2001-2003 by Internet Software Consortium
   8  *
   9  * Permission to use, copy, modify, and distribute this software for any
  10  * purpose with or without fee is hereby granted, provided that the above
  11  * copyright notice and this permission notice appear in all copies.
  12  *
  13  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  14  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  15  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  16  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  17  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  18  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  19  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  20  *
  21  *   Internet Systems Consortium, Inc.
  22  *   950 Charter Street
  23  *   Redwood City, CA 94063
  24  *   <info@isc.org>
  25  *   http://www.isc.org/
  26  *
  27  * This software has been written for Internet Systems Consortium
  28  * by Ted Lemon, as part of a project for Nominum, Inc.   To learn more
  29  * about Internet Systems Consortium, see http://www.isc.org/.  To
  30  * learn more about Nominum, Inc., see ``http://www.nominum.com''.
  31  */
  32
  33 #include <omapip/omapip_p.h>
  34
  35 #include "minires/minires.h"
  36 #include "arpa/nameser.h"
  37
  38 static void trace_mr_output_input (trace_type_t *, unsigned, char *);
  39 static void trace_mr_output_stop (trace_type_t *);
  40 static void trace_mr_input_input (trace_type_t *, unsigned, char *);
  41 static void trace_mr_input_stop (trace_type_t *);
  42 static void trace_mr_statp_input (trace_type_t *, unsigned, char *);
  43 static void trace_mr_statp_stop (trace_type_t *);
  44 static void trace_mr_randomid_input (trace_type_t *, unsigned, char *);
  45 static void trace_mr_randomid_stop (trace_type_t *);
  46 trace_type_t *trace_mr_output;
  47 trace_type_t *trace_mr_input;
  48 trace_type_t *trace_mr_statp;
  49 trace_type_t *trace_mr_randomid;
  50 ssize_t trace_mr_send (int, void *, size_t, int);
  51 ssize_t trace_mr_read_playback (struct sockaddr_in *, void *, size_t);
  52 void trace_mr_read_record (struct sockaddr_in *, void *, ssize_t);
  53 ssize_t trace_mr_recvfrom (int s, void *, size_t, int,
  54                            struct sockaddr *, SOCKLEN_T *);
  55 ssize_t trace_mr_read (int, void *, size_t);
  56 int trace_mr_connect (int s, struct sockaddr *, SOCKLEN_T);
  57 int trace_mr_socket (int, int, int);
  58 int trace_mr_bind (int, struct sockaddr *, SOCKLEN_T);
  59 int trace_mr_close (int);
  60 time_t trace_mr_time (time_t *);
  61 int trace_mr_select (int, fd_set *, fd_set *, fd_set *, struct timeval *);
  62 unsigned int trace_mr_res_randomid (unsigned int);
  63
  64 extern TIME cur_time;
  65
  66 #if defined (TRACING)
  67 void trace_mr_init ()
  68 {
  69         trace_mr_output = trace_type_register ("mr-output", (void *)0,
  70                                                trace_mr_output_input,
  71                                                trace_mr_output_stop, MDL);
  72         trace_mr_input = trace_type_register ("mr-input", (void *)0,
  73                                               trace_mr_input_input,
  74                                               trace_mr_input_stop, MDL);
  75         trace_mr_statp = trace_type_register ("mr-statp", (void *)0,
  76                                               trace_mr_statp_input,
  77                                               trace_mr_statp_stop, MDL);
  78         trace_mr_randomid = trace_type_register ("mr-randomid", (void *)0,
  79                                                  trace_mr_randomid_input,
  80                                                  trace_mr_randomid_stop, MDL);
  81 }
  82
  83 void trace_mr_statp_setup (res_state statp)
  84 {
  85         unsigned buflen = 0;
  86         char *buf = (char *)0;
  87         isc_result_t status;
  88         int i;
  89
  90         if (trace_playback ()) {
  91                 int nscount;
  92                 status = trace_get_packet (&trace_mr_statp, &buflen, &buf);
  93                 if (status != ISC_R_SUCCESS) {
  94                         log_error ("trace_mr_statp: no statp packet found.");
  95                         return;
  96                 }
  97                 nscount = buflen / sizeof (struct in_addr);
  98                 if (nscount * (sizeof (struct in_addr)) != buflen ||
  99                     nscount < 1) {
 100                         log_error ("trace_mr_statp: bogus length: %d",
 101                                    buflen);
 102                         return;
 103                 }
 104                 if (nscount > MAXNS)
 105                         nscount = MAXNS;
 106                 for (i = 0; i < nscount; i++) {
 107 #if defined (HAVE_SA_LEN)
 108                         statp -> nsaddr_list [i].sin_len =
 109                                 sizeof (struct sockaddr_in);
 110 #endif
 111                         memset (&statp -> nsaddr_list [i], 0,
 112                                 sizeof statp -> nsaddr_list [i]);
 113                         statp -> nsaddr_list [i].sin_port = htons (53); /*XXX*/
 114                         statp -> nsaddr_list [i].sin_family = AF_INET;
 115                         memcpy (&statp -> nsaddr_list [i].sin_addr,
 116                                 (buf + i * (sizeof (struct in_addr))),
 117                                 sizeof (struct in_addr));
 118                 }
 119                 statp -> nscount = nscount;
 120                 dfree (buf, MDL);
 121                 buf = (char *)0;
 122         }
 123         if (trace_record ()) {
 124                 trace_iov_t *iov;
 125                 iov = dmalloc ((statp -> nscount *
 126                                 sizeof (trace_iov_t)), MDL);
 127                 if (!iov) {
 128                         trace_stop ();
 129                         log_error ("No memory for statp iov.");
 130                         return;
 131                 }
 132                 for (i = 0; i < statp -> nscount; i++) {
 133                         iov [i].buf =
 134                                 (char *)&statp -> nsaddr_list [i].sin_addr;
 135                         iov [i].len = sizeof (struct in_addr);
 136                 }
 137                 trace_write_packet_iov (trace_mr_statp, i, iov, MDL);
 138                 dfree (iov, MDL);
 139         }
 140 }
 141 #endif
 142
 143 ssize_t trace_mr_send (int fd, void *msg, size_t len, int flags)
 144 {
 145         ssize_t rv;
 146 #if defined (TRACING)
 147         isc_result_t status;
 148         unsigned buflen = 0;
 149         char *inbuf = (char *)0;
 150         u_int32_t result;
 151         u_int32_t sflags;
 152
 153         if (trace_playback()) {
 154                 status = trace_get_packet (&trace_mr_output, &buflen, &inbuf);
 155                 if (status != ISC_R_SUCCESS) {
 156                         log_error ("trace_mr_recvfrom: no input found.");
 157                         errno = ECONNREFUSED;
 158                         return -1;
 159                 }
 160                 if (buflen < sizeof result) {
 161                         log_error ("trace_mr_recvfrom: data too short.");
 162                         errno = ECONNREFUSED;
 163                         dfree (inbuf, MDL);
 164                         return -1;
 165                 }
 166                 memcpy (&result, inbuf, sizeof result);
 167                 rv = ntohl (result);
 168                 dfree (inbuf, MDL);
 169         } else
 170 #endif
 171                 rv = send (fd, msg, len, flags);
 172 #if defined (TRACING)
 173         if (trace_record ()) {
 174                 trace_iov_t iov [3];
 175                 result = htonl (rv);
 176                 sflags = htonl (flags);
 177                 iov [0].len = sizeof result;
 178                 iov [0].buf = (char *)&result;
 179                 iov [1].len = sizeof sflags;
 180                 iov [1].buf = (char *)&flags;
 181                 iov [2].len = len;
 182                 iov [2].buf = msg;
 183                 trace_write_packet_iov (trace_mr_output, 3, iov, MDL);
 184         }
 185 #endif
 186         return rv;
 187 }
 188
 189 #if defined (TRACING)
 190 ssize_t trace_mr_read_playback (struct sockaddr_in *from,
 191                                 void *buf, size_t nbytes)
 192 {
 193         isc_result_t status;
 194         unsigned buflen = 0, left;
 195         char *inbuf = (char *)0;
 196         char *bufp;
 197         u_int32_t result;
 198
 199         status = trace_get_packet (&trace_mr_input, &buflen, &inbuf);
 200         if (status != ISC_R_SUCCESS) {
 201                 log_error ("trace_mr_recvfrom: no input found.");
 202                 errno = ECONNREFUSED;
 203                 return -1;
 204         }
 205         if (buflen < sizeof result) {
 206                 log_error ("trace_mr_recvfrom: data too short.");
 207                 errno = ECONNREFUSED;
 208                 dfree (inbuf, MDL);
 209                 return -1;
 210         }
 211         bufp = inbuf;
 212         left = buflen;
 213         memcpy (&result, bufp, sizeof result);
 214         result = ntohl (result);
 215         bufp += sizeof result;
 216         left -= sizeof result;
 217         if (result == 0) {
 218                 if (left < ((sizeof from -> sin_port) +
 219                             sizeof (from -> sin_addr))) {
 220                         log_error ("trace_mr_recvfrom: data too short.");
 221                         errno = ECONNREFUSED;
 222                         dfree (inbuf, MDL);
 223                         return -1;
 224                 }
 225                 if (from)
 226                         memset (from, 0, sizeof *from);
 227                 if (from)
 228                         memcpy (&from -> sin_addr, bufp,
 229                                 sizeof from -> sin_addr);
 230                 bufp += sizeof from -> sin_addr;
 231                 left -= sizeof from -> sin_addr;
 232                 if (from)
 233                         memcpy (&from -> sin_port, bufp,
 234                                 sizeof from -> sin_port);
 235                 bufp += sizeof from -> sin_port;
 236                 left -= sizeof from -> sin_port;
 237                 if (from) {
 238                         from -> sin_family = AF_INET;
 239 #if defined(HAVE_SA_LEN)
 240                         from -> sin_len = sizeof (struct sockaddr_in);
 241 #endif
 242                 }
 243                 if (left > nbytes) {
 244                         log_error ("trace_mr_recvfrom: too much%s",
 245                                    " data.");
 246                         errno = ECONNREFUSED;
 247                         dfree (inbuf, MDL);
 248                         return -1;
 249                 }
 250                 memcpy (buf, bufp, left);
 251                 dfree (inbuf, MDL);
 252                 return left;
 253         }
 254         errno = ECONNREFUSED;
 255         return -1;
 256 }
 257
 258 void trace_mr_read_record (struct sockaddr_in *from, void *buf, ssize_t rv)
 259 {
 260         trace_iov_t iov [4];
 261         u_int32_t result;
 262         int iolen = 0;
 263         static char zero [4] = { 0, 0, 0, 0 };
 264
 265         if (rv < 0)
 266                 result = htonl (errno);         /* XXX */
 267         else
 268                 result = 0;
 269         iov [iolen].buf = (char *)&result;
 270         iov [iolen++].len = sizeof result;
 271         if (rv > 0) {
 272                 if (from) {
 273                         iov [iolen].buf = (char *)&from -> sin_addr;
 274                         iov [iolen++].len = sizeof from -> sin_addr;
 275                         iov [iolen].buf = (char *)&from -> sin_port;
 276                         iov [iolen++].len = sizeof from -> sin_port;
 277                 } else {
 278                         iov [iolen].buf = zero;
 279                         iov [iolen++].len = sizeof from -> sin_addr;
 280                         iov [iolen].buf = zero;
 281                         iov [iolen++].len = sizeof from -> sin_port;
 282                 }
 283
 284                 iov [iolen].buf = buf;
 285                 iov [iolen++].len = rv;
 286         }
 287         trace_write_packet_iov (trace_mr_input, iolen, iov, MDL);
 288 }
 289 #endif
 290
 291 ssize_t trace_mr_recvfrom (int s, void *buf, size_t len, int flags,
 292                            struct sockaddr *from, SOCKLEN_T *fromlen)
 293 {
 294         ssize_t rv;
 295
 296 #if defined (TRACING)
 297         if (trace_playback ())
 298                 rv = trace_mr_read_playback ((struct sockaddr_in *)from,
 299                                              buf, len);
 300         else
 301 #endif
 302                 rv = recvfrom (s, buf, len, flags, from, fromlen);
 303 #if defined (TRACING)
 304         if (trace_record ()) {
 305                 trace_mr_read_record ((struct sockaddr_in *)from, buf, rv);
 306         }
 307 #endif
 308         return rv;
 309 }
 310
 311 ssize_t trace_mr_read (int d, void *buf, size_t nbytes)
 312 {
 313         ssize_t rv;
 314
 315 #if defined (TRACING)
 316         if (trace_playback ())
 317                 rv = trace_mr_read_playback ((struct sockaddr_in *)0,
 318                                              buf, nbytes);
 319         else
 320 #endif
 321                 rv = read (d, buf, nbytes);
 322 #if defined (TRACING)
 323         if (trace_record ()) {
 324                 trace_mr_read_record ((struct sockaddr_in *)0, buf, rv);
 325         }
 326 #endif
 327         return rv;
 328 }
 329
 330 int trace_mr_connect (int s, struct sockaddr *name, SOCKLEN_T namelen)
 331 {
 332 #if defined (TRACING)
 333         if (!trace_playback ())
 334 #endif
 335                 return connect (s, name, namelen);
 336 #if defined (TRACING)
 337         return 0;
 338 #endif
 339 }
 340
 341 int trace_mr_socket (int domain, int type, int protocol)
 342 {
 343 #if defined (TRACING)
 344         if (!trace_playback ())
 345 #endif
 346                 return socket (domain, type, protocol);
 347 #if defined (TRACING)
 348         return 100;
 349 #endif
 350 }
 351
 352 int trace_mr_bind (int s, struct sockaddr *name, SOCKLEN_T namelen)
 353 {
 354 #if defined (TRACING)
 355         if (!trace_playback ())
 356 #endif
 357                 return bind (s, name, namelen);
 358 #if defined (TRACING)
 359         return 0;
 360 #endif
 361 }
 362
 363 int trace_mr_close (int s)
 364 {
 365 #if defined (TRACING)
 366         if (!trace_playback ())
 367 #endif
 368                 return close (s);
 369 #if defined (TRACING)
 370         return 0;
 371 #endif
 372 }
 373
 374 time_t trace_mr_time (time_t *tp)
 375 {
 376 #if defined (TRACING)
 377         if (trace_playback ()) {
 378                 if (tp)
 379                         *tp = cur_time;
 380                 return cur_time;
 381         }
 382 #endif
 383         return time (tp);
 384 }
 385
 386 int trace_mr_select (int s, fd_set *r, fd_set *w, fd_set *x, struct timeval *t)
 387 {
 388 #if defined (TRACING)
 389         trace_type_t *ttp = (trace_type_t *)0;
 390
 391         if (trace_playback ()) {
 392                 time_t nct = trace_snoop_time (&ttp);
 393                 time_t secr = t -> tv_sec;
 394                 t -> tv_sec = nct - cur_time;
 395                 if (t -> tv_sec > secr)
 396                         return 0;
 397                 if (ttp == trace_mr_input)
 398                         return 1;
 399                 return 0;
 400         }
 401 #endif
 402         return select (s, r, w, x, t);
 403 }
 404
 405 unsigned int trace_mr_res_randomid (unsigned int oldid)
 406 {
 407         u_int32_t id;
 408         int rid = oldid;
 409 #if defined (TRACING)
 410         unsigned buflen = 0;
 411         char *buf = (char *)0;
 412         isc_result_t status;
 413
 414         if (trace_playback ()) {
 415                 status = trace_get_packet (&trace_mr_randomid, &buflen, &buf);
 416                 if (status != ISC_R_SUCCESS) {
 417                         log_error ("trace_mr_statp: no statp packet found.");
 418                         return oldid;
 419                 }
 420                 if (buflen != sizeof id) {
 421                         log_error ("trace_mr_randomid: bogus length: %d",
 422                                    buflen);
 423                         return oldid;
 424                 }
 425                 memcpy (&id, buf, sizeof id);
 426                 dfree (buf, MDL);
 427                 buf = (char *)0;
 428                 rid = ntohl (id);
 429         }
 430         if (trace_record ()) {
 431                 id = htonl (rid);
 432                 trace_write_packet (trace_mr_randomid,
 433                                     sizeof id, (char *)&id, MDL);
 434         }
 435 #endif
 436         return rid;
 437 }
 438
 439 #if defined (TRACING)
 440 static void trace_mr_output_input (trace_type_t *ttype,
 441                                    unsigned length, char *buf)
 442 {
 443 }
 444
 445 static void trace_mr_output_stop (trace_type_t *ttype)
 446 {
 447 }
 448
 449 static void trace_mr_input_input (trace_type_t *ttype,
 450                                   unsigned length, char *buf)
 451 {
 452         log_error ("unaccounted-for minires input.");
 453 }
 454
 455 static void trace_mr_input_stop (trace_type_t *ttype)
 456 {
 457 }
 458
 459 static void trace_mr_statp_input (trace_type_t *ttype,
 460                                   unsigned length, char *buf)
 461 {
 462         log_error ("unaccounted-for minires statp input.");
 463 }
 464
 465 static void trace_mr_statp_stop (trace_type_t *ttype)
 466 {
 467 }
 468
 469 static void trace_mr_randomid_input (trace_type_t *ttype,
 470                                      unsigned length, char *buf)
 471 {
 472         log_error ("unaccounted-for minires randomid input.");
 473 }
 474
 475 static void trace_mr_randomid_stop (trace_type_t *ttype)
 476 {
 477 }
 478 #endif