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         { ether_if_print,       DLT_EN10MB },
  57 #ifdef DLT_IEEE802_15_4
  58         { ieee802_15_4_if_print, DLT_IEEE802_15_4 },
  59 #endif
  60 #ifdef DLT_IEEE802_15_4_NOFCS
  61         { ieee802_15_4_if_print, DLT_IEEE802_15_4_NOFCS },
  62 #endif
  63 #ifdef DLT_IEEE802_15_4_TAP
  64         { ieee802_15_4_tap_if_print, DLT_IEEE802_15_4_TAP },
  65 #endif
  66 #ifdef DLT_NETANALYZER
  67         { netanalyzer_if_print, DLT_NETANALYZER },
  68 #endif
  69 #ifdef DLT_NETANALYZER_TRANSPARENT
  70         { netanalyzer_transparent_if_print, DLT_NETANALYZER_TRANSPARENT },
  71 #endif
  72 #ifdef DLT_NFLOG
  73         { nflog_if_print,       DLT_NFLOG},
  74 #endif
  75 #ifdef DLT_CIP
  76         { cip_if_print,         DLT_CIP },
  77 #endif
  78 #ifdef DLT_ATM_CLIP
  79         { cip_if_print,         DLT_ATM_CLIP },
  80 #endif
  81 #ifdef DLT_IP_OVER_FC
  82         { ipfc_if_print,        DLT_IP_OVER_FC },
  83 #endif
  84 #ifdef DLT_LANE8023
  85         { lane_if_print,        DLT_LANE8023 },
  86 #endif
  87 #ifdef DLT_IPOIB
  88         { ipoib_if_print,       DLT_IPOIB },
  89 #endif
  90 #ifdef DLT_C_HDLC
  91         { chdlc_if_print,       DLT_C_HDLC },
  92 #endif
  93 #ifdef DLT_HDLC
  94         { chdlc_if_print,       DLT_HDLC },
  95 #endif
  96 #ifdef DLT_PPP_ETHER
  97         { pppoe_if_print,       DLT_PPP_ETHER },
  98 #endif
  99 #if defined(DLT_PFLOG) && defined(HAVE_NET_IF_PFLOG_H)
 100         { pflog_if_print,       DLT_PFLOG },
 101 #endif
 102         { token_if_print,       DLT_IEEE802 },
 103         { fddi_if_print,        DLT_FDDI },
 104 #ifdef DLT_LINUX_SLL
 105         { sll_if_print,         DLT_LINUX_SLL },
 106 #endif
 107 #ifdef DLT_LINUX_SLL2
 108         { sll2_if_print,        DLT_LINUX_SLL2 },
 109 #endif
 110 #ifdef DLT_FR
 111         { fr_if_print,          DLT_FR },
 112 #endif
 113 #ifdef DLT_FRELAY
 114         { fr_if_print,          DLT_FRELAY },
 115 #endif
 116 #ifdef DLT_MFR
 117         { mfr_if_print,         DLT_MFR },
 118 #endif
 119         { atm_if_print,         DLT_ATM_RFC1483 },
 120         { sl_if_print,          DLT_SLIP },
 121 #ifdef DLT_SLIP_BSDOS
 122         { sl_bsdos_if_print,    DLT_SLIP_BSDOS },
 123 #endif
 124 #ifdef DLT_LTALK
 125         { ltalk_if_print,       DLT_LTALK },
 126 #endif
 127 #ifdef DLT_JUNIPER_ATM1
 128         { juniper_atm1_if_print, DLT_JUNIPER_ATM1 },
 129 #endif
 130 #ifdef DLT_JUNIPER_ATM2
 131         { juniper_atm2_if_print, DLT_JUNIPER_ATM2 },
 132 #endif
 133 #ifdef DLT_JUNIPER_MFR
 134         { juniper_mfr_if_print, DLT_JUNIPER_MFR },
 135 #endif
 136 #ifdef DLT_JUNIPER_MLFR
 137         { juniper_mlfr_if_print, DLT_JUNIPER_MLFR },
 138 #endif
 139 #ifdef DLT_JUNIPER_MLPPP
 140         { juniper_mlppp_if_print, DLT_JUNIPER_MLPPP },
 141 #endif
 142 #ifdef DLT_JUNIPER_PPPOE
 143         { juniper_pppoe_if_print, DLT_JUNIPER_PPPOE },
 144 #endif
 145 #ifdef DLT_JUNIPER_PPPOE_ATM
 146         { juniper_pppoe_atm_if_print, DLT_JUNIPER_PPPOE_ATM },
 147 #endif
 148 #ifdef DLT_JUNIPER_GGSN
 149         { juniper_ggsn_if_print, DLT_JUNIPER_GGSN },
 150 #endif
 151 #ifdef DLT_JUNIPER_ES
 152         { juniper_es_if_print,  DLT_JUNIPER_ES },
 153 #endif
 154 #ifdef DLT_JUNIPER_MONITOR
 155         { juniper_monitor_if_print, DLT_JUNIPER_MONITOR },
 156 #endif
 157 #ifdef DLT_JUNIPER_SERVICES
 158         { juniper_services_if_print, DLT_JUNIPER_SERVICES },
 159 #endif
 160 #ifdef DLT_JUNIPER_ETHER
 161         { juniper_ether_if_print,       DLT_JUNIPER_ETHER },
 162 #endif
 163 #ifdef DLT_JUNIPER_PPP
 164         { juniper_ppp_if_print, DLT_JUNIPER_PPP },
 165 #endif
 166 #ifdef DLT_JUNIPER_FRELAY
 167         { juniper_frelay_if_print,      DLT_JUNIPER_FRELAY },
 168 #endif
 169 #ifdef DLT_JUNIPER_CHDLC
 170         { juniper_chdlc_if_print,       DLT_JUNIPER_CHDLC },
 171 #endif
 172 #ifdef DLT_IEEE802_11_RADIO
 173         { ieee802_11_radio_if_print,    DLT_IEEE802_11_RADIO },
 174 #endif
 175 #ifdef DLT_IEEE802_11
 176         { ieee802_11_if_print,  DLT_IEEE802_11},
 177 #endif
 178 #ifdef DLT_IEEE802_11_RADIO_AVS
 179         { ieee802_11_radio_avs_if_print,        DLT_IEEE802_11_RADIO_AVS },
 180 #endif
 181 #ifdef DLT_PRISM_HEADER
 182         { prism_if_print,       DLT_PRISM_HEADER },
 183 #endif
 184         { ppp_if_print,         DLT_PPP },
 185 #ifdef DLT_PPP_WITHDIRECTION
 186         { ppp_if_print,         DLT_PPP_WITHDIRECTION },
 187 #endif
 188 #ifdef DLT_PPP_BSDOS
 189         { ppp_bsdos_if_print,   DLT_PPP_BSDOS },
 190 #endif
 191 #ifdef DLT_PPP_SERIAL
 192         { ppp_hdlc_if_print,    DLT_PPP_SERIAL },
 193 #endif
 194 #ifdef DLT_DSA_TAG_BRCM
 195         { brcm_tag_if_print,    DLT_DSA_TAG_BRCM },
 196 #endif
 197 #ifdef DLT_DSA_TAG_BRCM_PREPEND
 198         { brcm_tag_prepend_if_print, DLT_DSA_TAG_BRCM_PREPEND },
 199 #endif
 200 #ifdef DLT_VSOCK
 201         { vsock_if_print,       DLT_VSOCK },
 202 #endif
 203 #ifdef DLT_DSA_TAG_DSA
 204         { dsa_if_print, DLT_DSA_TAG_DSA },
 205 #endif
 206 #ifdef DLT_DSA_TAG_EDSA
 207         { edsa_if_print,        DLT_DSA_TAG_EDSA },
 208 #endif
 209         { NULL,                 0 },
 210 };
 211
 212 static const struct void_printer void_printers[] = {
 213 #ifdef DLT_APPLE_IP_OVER_IEEE1394
 214         { ap1394_if_print,      DLT_APPLE_IP_OVER_IEEE1394 },
 215 #endif
 216         { arcnet_if_print,      DLT_ARCNET },
 217 #ifdef DLT_ARCNET_LINUX
 218         { arcnet_linux_if_print, DLT_ARCNET_LINUX },
 219 #endif
 220 #ifdef DLT_BLUETOOTH_HCI_H4_WITH_PHDR
 221         { bt_if_print,          DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
 222 #endif
 223 #ifdef DLT_ENC
 224         { enc_if_print,         DLT_ENC },
 225 #endif
 226 #ifdef DLT_IPNET
 227         { ipnet_if_print,       DLT_IPNET },
 228 #endif
 229         { null_if_print,        DLT_NULL },
 230 #ifdef DLT_LOOP
 231         { null_if_print,        DLT_LOOP },
 232 #endif
 233 #ifdef DLT_PKTAP
 234         { pktap_if_print,       DLT_PKTAP },
 235 #endif
 236 #ifdef DLT_PPI
 237         { ppi_if_print,         DLT_PPI },
 238 #endif
 239         { raw_if_print,         DLT_RAW },
 240 #ifdef DLT_IPV4
 241         { raw_if_print,         DLT_IPV4 },
 242 #endif
 243 #ifdef DLT_IPV6
 244         { raw_if_print,         DLT_IPV6 },
 245 #endif
 246 #ifdef DLT_SUNATM
 247         { sunatm_if_print,      DLT_SUNATM },
 248 #endif
 249 #ifdef DLT_SYMANTEC_FIREWALL
 250         { symantec_if_print,    DLT_SYMANTEC_FIREWALL },
 251 #endif
 252 #ifdef DLT_USB_LINUX
 253         { usb_linux_48_byte_if_print, DLT_USB_LINUX},
 254 #endif /* DLT_USB_LINUX */
 255 #ifdef DLT_USB_LINUX_MMAPPED
 256         { usb_linux_64_byte_if_print, DLT_USB_LINUX_MMAPPED},
 257 #endif /* DLT_USB_LINUX_MMAPPED */
 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         const char *dltname;
 383         if_printer_t printer;
 384
 385         printer = lookup_printer(ndo, type);
 386         if (printer.printer == NULL) {
 387                 dltname = pcap_datalink_val_to_name(type);
 388                 if (dltname != NULL)
 389                         (*ndo->ndo_error)(ndo, S_ERR_ND_NO_PRINTER,
 390                                           "packet printing is not supported for link type %s: use -w",
 391                                           dltname);
 392                 else
 393                         (*ndo->ndo_error)(ndo, S_ERR_ND_NO_PRINTER,
 394                                           "packet printing is not supported for link type %d: use -w", type);
 395         }
 396         return printer;
 397 }
 398
 399 void
 400 pretty_print_packet(netdissect_options *ndo, const struct pcap_pkthdr *h,
 401                     const u_char *sp, u_int packets_captured)
 402 {
 403         u_int hdrlen;
 404         int invalid_header = 0;
 405
 406         if (ndo->ndo_packet_number)
 407                 ND_PRINT("%5u  ", packets_captured);
 408
 409         /* Sanity checks on packet length / capture length */
 410         if (h->caplen == 0) {
 411                 invalid_header = 1;
 412                 ND_PRINT("[Invalid header: caplen==0");
 413         }
 414         if (h->len == 0) {
 415                 if (!invalid_header) {
 416                         invalid_header = 1;
 417                         ND_PRINT("[Invalid header:");
 418                 } else
 419                         ND_PRINT(",");
 420                 ND_PRINT(" len==0");
 421         } else if (h->len < h->caplen) {
 422                 if (!invalid_header) {
 423                         invalid_header = 1;
 424                         ND_PRINT("[Invalid header:");
 425                 } else
 426                         ND_PRINT(",");
 427                 ND_PRINT(" len(%u) < caplen(%u)", h->len, h->caplen);
 428         }
 429         if (h->caplen > MAXIMUM_SNAPLEN) {
 430                 if (!invalid_header) {
 431                         invalid_header = 1;
 432                         ND_PRINT("[Invalid header:");
 433                 } else
 434                         ND_PRINT(",");
 435                 ND_PRINT(" caplen(%u) > %u", h->caplen, MAXIMUM_SNAPLEN);
 436         }
 437         if (h->len > MAXIMUM_SNAPLEN) {
 438                 if (!invalid_header) {
 439                         invalid_header = 1;
 440                         ND_PRINT("[Invalid header:");
 441                 } else
 442                         ND_PRINT(",");
 443                 ND_PRINT(" len(%u) > %u", h->len, MAXIMUM_SNAPLEN);
 444         }
 445         if (invalid_header) {
 446                 ND_PRINT("]\n");
 447                 return;
 448         }
 449
 450         /*
 451          * At this point:
 452          *   capture length != 0,
 453          *   packet length != 0,
 454          *   capture length <= MAXIMUM_SNAPLEN,
 455          *   packet length <= MAXIMUM_SNAPLEN,
 456          *   packet length >= capture length.
 457          *
 458          * Currently, there is no D-Bus printer, thus no need for
 459          * bigger lengths.
 460          */
 461
 462         ts_print(ndo, &h->ts);
 463
 464         /*
 465          * Printers must check that they're not walking off the end of
 466          * the packet.
 467          * Rather than pass it all the way down, we set this member
 468          * of the netdissect_options structure.
 469          */
 470         ndo->ndo_snapend = sp + h->caplen;
 471
 472         ndo->ndo_protocol = "";
 473         ndo->ndo_ll_header_length = 0;
 474         if (setjmp(ndo->ndo_truncated) == 0) {
 475                 /* Print the packet. */
 476                 if (ndo->ndo_void_printer == TRUE) {
 477                         (ndo->ndo_if_printer.void_printer)(ndo, h, sp);
 478                         hdrlen = ndo->ndo_ll_header_length;
 479                 } else
 480                         hdrlen = (ndo->ndo_if_printer.uint_printer)(ndo, h, sp);
 481         } else {
 482                 /* A printer quit because the packet was truncated; report it */
 483                 ND_PRINT(" [|%s]", ndo->ndo_protocol);
 484                 hdrlen = ndo->ndo_ll_header_length;
 485         }
 486
 487         /*
 488          * Empty the stack of packet information, freeing all pushed buffers;
 489          * if we got here by a printer quitting, we need to release anything
 490          * that didn't get released because we longjmped out of the code
 491          * before it popped the packet information.
 492          */
 493         nd_pop_all_packet_info(ndo);
 494
 495         /*
 496          * Restore the original snapend, as a printer might have
 497          * changed it.
 498          */
 499         ndo->ndo_snapend = sp + h->caplen;
 500         if (ndo->ndo_Xflag) {
 501                 /*
 502                  * Print the raw packet data in hex and ASCII.
 503                  */
 504                 if (ndo->ndo_Xflag > 1) {
 505                         /*
 506                          * Include the link-layer header.
 507                          */
 508                         hex_and_ascii_print(ndo, "\n\t", sp, h->caplen);
 509                 } else {
 510                         /*
 511                          * Don't include the link-layer header - and if
 512                          * we have nothing past the link-layer header,
 513                          * print nothing.
 514                          */
 515                         if (h->caplen > hdrlen)
 516                                 hex_and_ascii_print(ndo, "\n\t", sp + hdrlen,
 517                                                     h->caplen - hdrlen);
 518                 }
 519         } else if (ndo->ndo_xflag) {
 520                 /*
 521                  * Print the raw packet data in hex.
 522                  */
 523                 if (ndo->ndo_xflag > 1) {
 524                         /*
 525                          * Include the link-layer header.
 526                          */
 527                         hex_print(ndo, "\n\t", sp, h->caplen);
 528                 } else {
 529                         /*
 530                          * Don't include the link-layer header - and if
 531                          * we have nothing past the link-layer header,
 532                          * print nothing.
 533                          */
 534                         if (h->caplen > hdrlen)
 535                                 hex_print(ndo, "\n\t", sp + hdrlen,
 536                                           h->caplen - hdrlen);
 537                 }
 538         } else if (ndo->ndo_Aflag) {
 539                 /*
 540                  * Print the raw packet data in ASCII.
 541                  */
 542                 if (ndo->ndo_Aflag > 1) {
 543                         /*
 544                          * Include the link-layer header.
 545                          */
 546                         ascii_print(ndo, sp, h->caplen);
 547                 } else {
 548                         /*
 549                          * Don't include the link-layer header - and if
 550                          * we have nothing past the link-layer header,
 551                          * print nothing.
 552                          */
 553                         if (h->caplen > hdrlen)
 554                                 ascii_print(ndo, sp + hdrlen, h->caplen - hdrlen);
 555                 }
 556         }
 557
 558         ND_PRINT("\n");
 559         nd_free_all(ndo);
 560 }
 561
 562 /*
 563  * By default, print the specified data out in hex and ASCII.
 564  */
 565 static void
 566 ndo_default_print(netdissect_options *ndo, const u_char *bp, u_int length)
 567 {
 568         hex_and_ascii_print(ndo, "\n\t", bp, length); /* pass on lf and indentation string */
 569 }
 570
 571 /* VARARGS */
 572 static void
 573 ndo_error(netdissect_options *ndo, status_exit_codes_t status,
 574           const char *fmt, ...)
 575 {
 576         va_list ap;
 577
 578         if (ndo->program_name)
 579                 (void)fprintf(stderr, "%s: ", ndo->program_name);
 580         va_start(ap, fmt);
 581         (void)vfprintf(stderr, fmt, ap);
 582         va_end(ap);
 583         if (*fmt) {
 584                 fmt += strlen(fmt);
 585                 if (fmt[-1] != '\n')
 586                         (void)fputc('\n', stderr);
 587         }
 588         nd_cleanup();
 589         exit(status);
 590         /* NOTREACHED */
 591 }
 592
 593 /* VARARGS */
 594 static void
 595 ndo_warning(netdissect_options *ndo, const char *fmt, ...)
 596 {
 597         va_list ap;
 598
 599         if (ndo->program_name)
 600                 (void)fprintf(stderr, "%s: ", ndo->program_name);
 601         (void)fprintf(stderr, "WARNING: ");
 602         va_start(ap, fmt);
 603         (void)vfprintf(stderr, fmt, ap);
 604         va_end(ap);
 605         if (*fmt) {
 606                 fmt += strlen(fmt);
 607                 if (fmt[-1] != '\n')
 608                         (void)fputc('\n', stderr);
 609         }
 610 }
 611
 612 static int
 613 ndo_printf(netdissect_options *ndo, const char *fmt, ...)
 614 {
 615         va_list args;
 616         int ret;
 617
 618         va_start(args, fmt);
 619         ret = vfprintf(stdout, fmt, args);
 620         va_end(args);
 621
 622         if (ret < 0)
 623                 ndo_error(ndo, S_ERR_ND_WRITE_FILE,
 624                           "Unable to write output: %s", pcap_strerror(errno));
 625         return (ret);
 626 }
 627
 628 void
 629 ndo_set_function_pointers(netdissect_options *ndo)
 630 {
 631         ndo->ndo_default_print=ndo_default_print;
 632         ndo->ndo_printf=ndo_printf;
 633         ndo->ndo_error=ndo_error;
 634         ndo->ndo_warning=ndo_warning;
 635 }