The Tcpdump Group git mirrors - tcpdump/blob - print.c

   1 /*
   2  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
   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: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  *
  21  * Support for splitting captures into multiple files with a maximum
  22  * file size:
  23  *
  24  * Copyright (c) 2001
  25  *      Seth Webster <swebster@sst.ll.mit.edu>
  26  */
  27
  28 #ifdef HAVE_CONFIG_H
  29 #include <config.h>
  30 #endif
  31
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include <setjmp.h>
  35
  36 #include "netdissect-stdinc.h"
  37
  38 #include "netdissect.h"
  39 #include "addrtoname.h"
  40 #include "print.h"
  41 #include "netdissect-alloc.h"
  42
  43 #include "pcap-missing.h"
  44
  45 struct uint_printer {
  46         uint_if_printer f;
  47         int type;
  48 };
  49
  50 struct void_printer {
  51         void_if_printer f;
  52         int type;
  53 };
  54
  55 static const struct uint_printer uint_printers[] = {
  56 #ifdef DLT_IEEE802_15_4
  57         { ieee802_15_4_if_print, DLT_IEEE802_15_4 },
  58 #endif
  59 #ifdef DLT_IEEE802_15_4_NOFCS
  60         { ieee802_15_4_if_print, DLT_IEEE802_15_4_NOFCS },
  61 #endif
  62 #ifdef DLT_IEEE802_15_4_TAP
  63         { ieee802_15_4_tap_if_print, DLT_IEEE802_15_4_TAP },
  64 #endif
  65 #ifdef DLT_CIP
  66         { cip_if_print,         DLT_CIP },
  67 #endif
  68 #ifdef DLT_ATM_CLIP
  69         { cip_if_print,         DLT_ATM_CLIP },
  70 #endif
  71 #ifdef DLT_IP_OVER_FC
  72         { ipfc_if_print,        DLT_IP_OVER_FC },
  73 #endif
  74 #ifdef DLT_LANE8023
  75         { lane_if_print,        DLT_LANE8023 },
  76 #endif
  77 #ifdef DLT_C_HDLC
  78         { chdlc_if_print,       DLT_C_HDLC },
  79 #endif
  80 #ifdef DLT_HDLC
  81         { chdlc_if_print,       DLT_HDLC },
  82 #endif
  83 #if defined(DLT_PFLOG) && defined(HAVE_NET_IF_PFLOG_H)
  84         { pflog_if_print,       DLT_PFLOG },
  85 #endif
  86         { token_if_print,       DLT_IEEE802 },
  87         { fddi_if_print,        DLT_FDDI },
  88 #ifdef DLT_LINUX_SLL
  89         { sll_if_print,         DLT_LINUX_SLL },
  90 #endif
  91 #ifdef DLT_LINUX_SLL2
  92         { sll2_if_print,        DLT_LINUX_SLL2 },
  93 #endif
  94 #ifdef DLT_FR
  95         { fr_if_print,          DLT_FR },
  96 #endif
  97 #ifdef DLT_FRELAY
  98         { fr_if_print,          DLT_FRELAY },
  99 #endif
 100 #ifdef DLT_MFR
 101         { mfr_if_print,         DLT_MFR },
 102 #endif
 103         { atm_if_print,         DLT_ATM_RFC1483 },
 104 #ifdef DLT_LTALK
 105         { ltalk_if_print,       DLT_LTALK },
 106 #endif
 107 #ifdef DLT_IEEE802_11_RADIO
 108         { ieee802_11_radio_if_print,    DLT_IEEE802_11_RADIO },
 109 #endif
 110 #ifdef DLT_IEEE802_11
 111         { ieee802_11_if_print,  DLT_IEEE802_11},
 112 #endif
 113 #ifdef DLT_IEEE802_11_RADIO_AVS
 114         { ieee802_11_radio_avs_if_print,        DLT_IEEE802_11_RADIO_AVS },
 115 #endif
 116 #ifdef DLT_PRISM_HEADER
 117         { prism_if_print,       DLT_PRISM_HEADER },
 118 #endif
 119         { ppp_if_print,         DLT_PPP },
 120 #ifdef DLT_PPP_WITHDIRECTION
 121         { ppp_if_print,         DLT_PPP_WITHDIRECTION },
 122 #endif
 123 #ifdef DLT_PPP_BSDOS
 124         { ppp_bsdos_if_print,   DLT_PPP_BSDOS },
 125 #endif
 126 #ifdef DLT_PPP_SERIAL
 127         { ppp_hdlc_if_print,    DLT_PPP_SERIAL },
 128 #endif
 129         { NULL,                 0 },
 130 };
 131
 132 static const struct void_printer void_printers[] = {
 133 #ifdef DLT_APPLE_IP_OVER_IEEE1394
 134         { ap1394_if_print,      DLT_APPLE_IP_OVER_IEEE1394 },
 135 #endif
 136         { arcnet_if_print,      DLT_ARCNET },
 137 #ifdef DLT_ARCNET_LINUX
 138         { arcnet_linux_if_print, DLT_ARCNET_LINUX },
 139 #endif
 140 #ifdef DLT_DSA_TAG_BRCM
 141         { brcm_tag_if_print,    DLT_DSA_TAG_BRCM },
 142 #endif
 143 #ifdef DLT_DSA_TAG_BRCM_PREPEND
 144         { brcm_tag_prepend_if_print, DLT_DSA_TAG_BRCM_PREPEND },
 145 #endif
 146 #ifdef DLT_BLUETOOTH_HCI_H4_WITH_PHDR
 147         { bt_if_print,          DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
 148 #endif
 149 #ifdef DLT_DSA_TAG_DSA
 150         { dsa_if_print,         DLT_DSA_TAG_DSA },
 151 #endif
 152 #ifdef DLT_DSA_TAG_EDSA
 153         { edsa_if_print,        DLT_DSA_TAG_EDSA },
 154 #endif
 155 #ifdef DLT_ENC
 156         { enc_if_print,         DLT_ENC },
 157 #endif
 158         { ether_if_print,       DLT_EN10MB },
 159 #ifdef DLT_IPNET
 160         { ipnet_if_print,       DLT_IPNET },
 161 #endif
 162 #ifdef DLT_IPOIB
 163         { ipoib_if_print,       DLT_IPOIB },
 164 #endif
 165 #ifdef DLT_JUNIPER_ATM1
 166         { juniper_atm1_if_print, DLT_JUNIPER_ATM1 },
 167 #endif
 168 #ifdef DLT_JUNIPER_ATM2
 169         { juniper_atm2_if_print, DLT_JUNIPER_ATM2 },
 170 #endif
 171 #ifdef DLT_JUNIPER_CHDLC
 172         { juniper_chdlc_if_print,       DLT_JUNIPER_CHDLC },
 173 #endif
 174 #ifdef DLT_JUNIPER_ES
 175         { juniper_es_if_print,  DLT_JUNIPER_ES },
 176 #endif
 177 #ifdef DLT_JUNIPER_ETHER
 178         { juniper_ether_if_print,       DLT_JUNIPER_ETHER },
 179 #endif
 180 #ifdef DLT_JUNIPER_FRELAY
 181         { juniper_frelay_if_print,      DLT_JUNIPER_FRELAY },
 182 #endif
 183 #ifdef DLT_JUNIPER_GGSN
 184         { juniper_ggsn_if_print, DLT_JUNIPER_GGSN },
 185 #endif
 186 #ifdef DLT_JUNIPER_MFR
 187         { juniper_mfr_if_print, DLT_JUNIPER_MFR },
 188 #endif
 189 #ifdef DLT_JUNIPER_MLFR
 190         { juniper_mlfr_if_print, DLT_JUNIPER_MLFR },
 191 #endif
 192 #ifdef DLT_JUNIPER_MLPPP
 193         { juniper_mlppp_if_print, DLT_JUNIPER_MLPPP },
 194 #endif
 195 #ifdef DLT_JUNIPER_MONITOR
 196         { juniper_monitor_if_print, DLT_JUNIPER_MONITOR },
 197 #endif
 198 #ifdef DLT_JUNIPER_PPP
 199         { juniper_ppp_if_print, DLT_JUNIPER_PPP },
 200 #endif
 201 #ifdef DLT_JUNIPER_PPPOE_ATM
 202         { juniper_pppoe_atm_if_print, DLT_JUNIPER_PPPOE_ATM },
 203 #endif
 204 #ifdef DLT_JUNIPER_PPPOE
 205         { juniper_pppoe_if_print, DLT_JUNIPER_PPPOE },
 206 #endif
 207 #ifdef DLT_JUNIPER_SERVICES
 208         { juniper_services_if_print, DLT_JUNIPER_SERVICES },
 209 #endif
 210 #ifdef DLT_NETANALYZER
 211         { netanalyzer_if_print, DLT_NETANALYZER },
 212 #endif
 213 #ifdef DLT_NETANALYZER_TRANSPARENT
 214         { netanalyzer_transparent_if_print, DLT_NETANALYZER_TRANSPARENT },
 215 #endif
 216 #ifdef DLT_NFLOG
 217         { nflog_if_print,       DLT_NFLOG},
 218 #endif
 219         { null_if_print,        DLT_NULL },
 220 #ifdef DLT_LOOP
 221         { null_if_print,        DLT_LOOP },
 222 #endif
 223 #ifdef DLT_PKTAP
 224         { pktap_if_print,       DLT_PKTAP },
 225 #endif
 226 #ifdef DLT_PPI
 227         { ppi_if_print,         DLT_PPI },
 228 #endif
 229 #ifdef DLT_PPP_ETHER
 230         { pppoe_if_print,       DLT_PPP_ETHER },
 231 #endif
 232         { raw_if_print,         DLT_RAW },
 233 #ifdef DLT_IPV4
 234         { raw_if_print,         DLT_IPV4 },
 235 #endif
 236 #ifdef DLT_IPV6
 237         { raw_if_print,         DLT_IPV6 },
 238 #endif
 239 #ifdef DLT_SLIP_BSDOS
 240         { sl_bsdos_if_print,    DLT_SLIP_BSDOS },
 241 #endif
 242         { sl_if_print,          DLT_SLIP },
 243 #ifdef DLT_SUNATM
 244         { sunatm_if_print,      DLT_SUNATM },
 245 #endif
 246 #ifdef DLT_SYMANTEC_FIREWALL
 247         { symantec_if_print,    DLT_SYMANTEC_FIREWALL },
 248 #endif
 249 #ifdef DLT_USB_LINUX
 250         { usb_linux_48_byte_if_print, DLT_USB_LINUX},
 251 #endif /* DLT_USB_LINUX */
 252 #ifdef DLT_USB_LINUX_MMAPPED
 253         { usb_linux_64_byte_if_print, DLT_USB_LINUX_MMAPPED},
 254 #endif /* DLT_USB_LINUX_MMAPPED */
 255 #ifdef DLT_VSOCK
 256         { vsock_if_print,       DLT_VSOCK },
 257 #endif
 258         { NULL,                 0 },
 259 };
 260
 261 static void     ndo_default_print(netdissect_options *ndo, const u_char *bp,
 262                     u_int length);
 263
 264 static void NORETURN ndo_error(netdissect_options *ndo,
 265                      status_exit_codes_t status,
 266                      FORMAT_STRING(const char *fmt), ...)
 267                      PRINTFLIKE(3, 4);
 268 static void     ndo_warning(netdissect_options *ndo,
 269                     FORMAT_STRING(const char *fmt), ...)
 270                     PRINTFLIKE(2, 3);
 271
 272 static int      ndo_printf(netdissect_options *ndo,
 273                      FORMAT_STRING(const char *fmt), ...)
 274                      PRINTFLIKE(2, 3);
 275
 276 void
 277 init_print(netdissect_options *ndo, uint32_t localnet, uint32_t mask)
 278 {
 279
 280         init_addrtoname(ndo, localnet, mask);
 281         init_checksum();
 282 }
 283
 284 uint_if_printer
 285 lookup_uint_printer(int type)
 286 {
 287         const struct uint_printer *p;
 288
 289         for (p = uint_printers; p->f; ++p)
 290                 if (type == p->type)
 291                         return p->f;
 292
 293 #if defined(DLT_USER2) && defined(DLT_PKTAP)
 294         /*
 295          * Apple incorrectly chose to use DLT_USER2 for their PKTAP
 296          * header.
 297          *
 298          * We map DLT_PKTAP, whether it's DLT_USER2 as it is on Darwin-
 299          * based OSes or the same value as LINKTYPE_PKTAP as it is on
 300          * other OSes, to LINKTYPE_PKTAP, so files written with
 301          * this version of libpcap for a DLT_PKTAP capture have a link-
 302          * layer header type of LINKTYPE_PKTAP.
 303          *
 304          * However, files written on OS X Mavericks for a DLT_PKTAP
 305          * capture have a link-layer header type of LINKTYPE_USER2.
 306          * If we don't have a printer for DLT_USER2, and type is
 307          * DLT_USER2, we look up the printer for DLT_PKTAP and use
 308          * that.
 309          */
 310         if (type == DLT_USER2) {
 311                 for (p = uint_printers; p->f; ++p)
 312                         if (DLT_PKTAP == p->type)
 313                                 return p->f;
 314         }
 315 #endif
 316
 317         return NULL;
 318         /* NOTREACHED */
 319 }
 320
 321 void_if_printer
 322 lookup_void_printer(int type)
 323 {
 324         const struct void_printer *p;
 325
 326         for (p = void_printers; p->f; ++p)
 327                 if (type == p->type)
 328                         return p->f;
 329
 330 #if defined(DLT_USER2) && defined(DLT_PKTAP)
 331         /*
 332          * Apple incorrectly chose to use DLT_USER2 for their PKTAP
 333          * header.
 334          *
 335          * We map DLT_PKTAP, whether it's DLT_USER2 as it is on Darwin-
 336          * based OSes or the same value as LINKTYPE_PKTAP as it is on
 337          * other OSes, to LINKTYPE_PKTAP, so files written with
 338          * this version of libpcap for a DLT_PKTAP capture have a link-
 339          * layer header type of LINKTYPE_PKTAP.
 340          *
 341          * However, files written on OS X Mavericks for a DLT_PKTAP
 342          * capture have a link-layer header type of LINKTYPE_USER2.
 343          * If we don't have a printer for DLT_USER2, and type is
 344          * DLT_USER2, we look up the printer for DLT_PKTAP and use
 345          * that.
 346          */
 347         if (type == DLT_USER2) {
 348                 for (p = void_printers; p->f; ++p)
 349                         if (DLT_PKTAP == p->type)
 350                                 return p->f;
 351         }
 352 #endif
 353
 354         return NULL;
 355         /* NOTREACHED */
 356 }
 357
 358 if_printer_t
 359 lookup_printer(netdissect_options *ndo, int type)
 360 {
 361         if_printer_t printer;
 362
 363         printer.void_printer = lookup_void_printer(type);
 364         ndo->ndo_void_printer = TRUE;
 365         if (printer.void_printer == NULL) {
 366                 printer.uint_printer = lookup_uint_printer(type);
 367                 ndo->ndo_void_printer = FALSE;
 368         }
 369         return printer;
 370 }
 371
 372 int
 373 has_printer(int type)
 374 {
 375         return (lookup_void_printer(type) != NULL ||
 376                 lookup_uint_printer(type) != NULL);
 377 }
 378
 379 if_printer_t
 380 get_if_printer(netdissect_options *ndo, int type)
 381 {
 382         if_printer_t printer;
 383
 384         printer = lookup_printer(ndo, type);
 385         if (printer.printer == NULL)
 386                 printer.void_printer = unsupported_if_print;
 387         return printer;
 388 }
 389
 390 void
 391 pretty_print_packet(netdissect_options *ndo, const struct pcap_pkthdr *h,
 392                     const u_char *sp, u_int packets_captured)
 393 {
 394         u_int hdrlen;
 395         int invalid_header = 0;
 396
 397         if (ndo->ndo_packet_number)
 398                 ND_PRINT("%5u  ", packets_captured);
 399
 400         /* Sanity checks on packet length / capture length */
 401         if (h->caplen == 0) {
 402                 invalid_header = 1;
 403                 ND_PRINT("[Invalid header: caplen==0");
 404         }
 405         if (h->len == 0) {
 406                 if (!invalid_header) {
 407                         invalid_header = 1;
 408                         ND_PRINT("[Invalid header:");
 409                 } else
 410                         ND_PRINT(",");
 411                 ND_PRINT(" len==0");
 412         } else if (h->len < h->caplen) {
 413                 if (!invalid_header) {
 414                         invalid_header = 1;
 415                         ND_PRINT("[Invalid header:");
 416                 } else
 417                         ND_PRINT(",");
 418                 ND_PRINT(" len(%u) < caplen(%u)", h->len, h->caplen);
 419         }
 420         if (h->caplen > MAXIMUM_SNAPLEN) {
 421                 if (!invalid_header) {
 422                         invalid_header = 1;
 423                         ND_PRINT("[Invalid header:");
 424                 } else
 425                         ND_PRINT(",");
 426                 ND_PRINT(" caplen(%u) > %u", h->caplen, MAXIMUM_SNAPLEN);
 427         }
 428         if (h->len > MAXIMUM_SNAPLEN) {
 429                 if (!invalid_header) {
 430                         invalid_header = 1;
 431                         ND_PRINT("[Invalid header:");
 432                 } else
 433                         ND_PRINT(",");
 434                 ND_PRINT(" len(%u) > %u", h->len, MAXIMUM_SNAPLEN);
 435         }
 436         if (invalid_header) {
 437                 ND_PRINT("]\n");
 438                 return;
 439         }
 440
 441         /*
 442          * At this point:
 443          *   capture length != 0,
 444          *   packet length != 0,
 445          *   capture length <= MAXIMUM_SNAPLEN,
 446          *   packet length <= MAXIMUM_SNAPLEN,
 447          *   packet length >= capture length.
 448          *
 449          * Currently, there is no D-Bus printer, thus no need for
 450          * bigger lengths.
 451          */
 452
 453         ts_print(ndo, &h->ts);
 454
 455         /*
 456          * Printers must check that they're not walking off the end of
 457          * the packet.
 458          * Rather than pass it all the way down, we set this member
 459          * of the netdissect_options structure.
 460          */
 461         ndo->ndo_snapend = sp + h->caplen;
 462
 463         ndo->ndo_protocol = "";
 464         ndo->ndo_ll_hdr_len = 0;
 465         if (setjmp(ndo->ndo_truncated) == 0) {
 466                 /* Print the packet. */
 467                 if (ndo->ndo_void_printer == TRUE) {
 468                         (ndo->ndo_if_printer.void_printer)(ndo, h, sp);
 469                         hdrlen = ndo->ndo_ll_hdr_len;
 470                 } else
 471                         hdrlen = (ndo->ndo_if_printer.uint_printer)(ndo, h, sp);
 472         } else {
 473                 /* A printer quit because the packet was truncated; report it */
 474                 ND_PRINT(" [|%s]", ndo->ndo_protocol);
 475                 hdrlen = ndo->ndo_ll_hdr_len;
 476         }
 477
 478         /*
 479          * Empty the stack of packet information, freeing all pushed buffers;
 480          * if we got here by a printer quitting, we need to release anything
 481          * that didn't get released because we longjmped out of the code
 482          * before it popped the packet information.
 483          */
 484         nd_pop_all_packet_info(ndo);
 485
 486         /*
 487          * Restore the original snapend, as a printer might have
 488          * changed it.
 489          */
 490         ndo->ndo_snapend = sp + h->caplen;
 491         if (ndo->ndo_Xflag) {
 492                 /*
 493                  * Print the raw packet data in hex and ASCII.
 494                  */
 495                 if (ndo->ndo_Xflag > 1) {
 496                         /*
 497                          * Include the link-layer header.
 498                          */
 499                         hex_and_ascii_print(ndo, "\n\t", sp, h->caplen);
 500                 } else {
 501                         /*
 502                          * Don't include the link-layer header - and if
 503                          * we have nothing past the link-layer header,
 504                          * print nothing.
 505                          */
 506                         if (h->caplen > hdrlen)
 507                                 hex_and_ascii_print(ndo, "\n\t", sp + hdrlen,
 508                                                     h->caplen - hdrlen);
 509                 }
 510         } else if (ndo->ndo_xflag) {
 511                 /*
 512                  * Print the raw packet data in hex.
 513                  */
 514                 if (ndo->ndo_xflag > 1) {
 515                         /*
 516                          * Include the link-layer header.
 517                          */
 518                         hex_print(ndo, "\n\t", sp, h->caplen);
 519                 } else {
 520                         /*
 521                          * Don't include the link-layer header - and if
 522                          * we have nothing past the link-layer header,
 523                          * print nothing.
 524                          */
 525                         if (h->caplen > hdrlen)
 526                                 hex_print(ndo, "\n\t", sp + hdrlen,
 527                                           h->caplen - hdrlen);
 528                 }
 529         } else if (ndo->ndo_Aflag) {
 530                 /*
 531                  * Print the raw packet data in ASCII.
 532                  */
 533                 if (ndo->ndo_Aflag > 1) {
 534                         /*
 535                          * Include the link-layer header.
 536                          */
 537                         ascii_print(ndo, sp, h->caplen);
 538                 } else {
 539                         /*
 540                          * Don't include the link-layer header - and if
 541                          * we have nothing past the link-layer header,
 542                          * print nothing.
 543                          */
 544                         if (h->caplen > hdrlen)
 545                                 ascii_print(ndo, sp + hdrlen, h->caplen - hdrlen);
 546                 }
 547         }
 548
 549         ND_PRINT("\n");
 550         nd_free_all(ndo);
 551 }
 552
 553 /*
 554  * By default, print the specified data out in hex and ASCII.
 555  */
 556 static void
 557 ndo_default_print(netdissect_options *ndo, const u_char *bp, u_int length)
 558 {
 559         hex_and_ascii_print(ndo, "\n\t", bp, length); /* pass on lf and indentation string */
 560 }
 561
 562 /* VARARGS */
 563 static void
 564 ndo_error(netdissect_options *ndo, status_exit_codes_t status,
 565           const char *fmt, ...)
 566 {
 567         va_list ap;
 568
 569         if (ndo->program_name)
 570                 (void)fprintf(stderr, "%s: ", ndo->program_name);
 571         va_start(ap, fmt);
 572         (void)vfprintf(stderr, fmt, ap);
 573         va_end(ap);
 574         if (*fmt) {
 575                 fmt += strlen(fmt);
 576                 if (fmt[-1] != '\n')
 577                         (void)fputc('\n', stderr);
 578         }
 579         nd_cleanup();
 580         exit(status);
 581         /* NOTREACHED */
 582 }
 583
 584 /* VARARGS */
 585 static void
 586 ndo_warning(netdissect_options *ndo, const char *fmt, ...)
 587 {
 588         va_list ap;
 589
 590         if (ndo->program_name)
 591                 (void)fprintf(stderr, "%s: ", ndo->program_name);
 592         (void)fprintf(stderr, "WARNING: ");
 593         va_start(ap, fmt);
 594         (void)vfprintf(stderr, fmt, ap);
 595         va_end(ap);
 596         if (*fmt) {
 597                 fmt += strlen(fmt);
 598                 if (fmt[-1] != '\n')
 599                         (void)fputc('\n', stderr);
 600         }
 601 }
 602
 603 static int
 604 ndo_printf(netdissect_options *ndo, const char *fmt, ...)
 605 {
 606         va_list args;
 607         int ret;
 608
 609         va_start(args, fmt);
 610         ret = vfprintf(stdout, fmt, args);
 611         va_end(args);
 612
 613         if (ret < 0)
 614                 ndo_error(ndo, S_ERR_ND_WRITE_FILE,
 615                           "Unable to write output: %s", pcap_strerror(errno));
 616         return (ret);
 617 }
 618
 619 void
 620 ndo_set_function_pointers(netdissect_options *ndo)
 621 {
 622         ndo->ndo_default_print=ndo_default_print;
 623         ndo->ndo_printf=ndo_printf;
 624         ndo->ndo_error=ndo_error;
 625         ndo->ndo_warning=ndo_warning;
 626 }