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 printer {
  46         if_printer f;
  47         int type;
  48 };
  49
  50 static const struct printer printers[] = {
  51         { ether_if_print,       DLT_EN10MB },
  52 #ifdef DLT_IPNET
  53         { ipnet_if_print,       DLT_IPNET },
  54 #endif
  55 #ifdef DLT_IEEE802_15_4
  56         { ieee802_15_4_if_print, DLT_IEEE802_15_4 },
  57 #endif
  58 #ifdef DLT_IEEE802_15_4_NOFCS
  59         { ieee802_15_4_if_print, DLT_IEEE802_15_4_NOFCS },
  60 #endif
  61 #ifdef DLT_IEEE802_15_4_TAP
  62         { ieee802_15_4_tap_if_print, DLT_IEEE802_15_4_TAP },
  63 #endif
  64 #ifdef DLT_PPI
  65         { ppi_if_print,         DLT_PPI },
  66 #endif
  67 #ifdef DLT_NETANALYZER
  68         { netanalyzer_if_print, DLT_NETANALYZER },
  69 #endif
  70 #ifdef DLT_NETANALYZER_TRANSPARENT
  71         { netanalyzer_transparent_if_print, DLT_NETANALYZER_TRANSPARENT },
  72 #endif
  73 #ifdef DLT_NFLOG
  74         { nflog_if_print,       DLT_NFLOG},
  75 #endif
  76 #ifdef DLT_CIP
  77         { cip_if_print,         DLT_CIP },
  78 #endif
  79 #ifdef DLT_ATM_CLIP
  80         { cip_if_print,         DLT_ATM_CLIP },
  81 #endif
  82 #ifdef DLT_IP_OVER_FC
  83         { ipfc_if_print,        DLT_IP_OVER_FC },
  84 #endif
  85         { null_if_print,        DLT_NULL },
  86 #ifdef DLT_LOOP
  87         { null_if_print,        DLT_LOOP },
  88 #endif
  89 #ifdef DLT_APPLE_IP_OVER_IEEE1394
  90         { ap1394_if_print,      DLT_APPLE_IP_OVER_IEEE1394 },
  91 #endif
  92 #ifdef DLT_BLUETOOTH_HCI_H4_WITH_PHDR
  93         { bt_if_print,          DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
  94 #endif
  95 #ifdef DLT_LANE8023
  96         { lane_if_print,        DLT_LANE8023 },
  97 #endif
  98         { arcnet_if_print,      DLT_ARCNET },
  99 #ifdef DLT_ARCNET_LINUX
 100         { arcnet_linux_if_print, DLT_ARCNET_LINUX },
 101 #endif
 102         { raw_if_print,         DLT_RAW },
 103 #ifdef DLT_IPV4
 104         { raw_if_print,         DLT_IPV4 },
 105 #endif
 106 #ifdef DLT_IPV6
 107         { raw_if_print,         DLT_IPV6 },
 108 #endif
 109 #ifdef DLT_USB_LINUX
 110         { usb_linux_48_byte_if_print, DLT_USB_LINUX},
 111 #endif /* DLT_USB_LINUX */
 112 #ifdef DLT_USB_LINUX_MMAPPED
 113         { usb_linux_64_byte_if_print, DLT_USB_LINUX_MMAPPED},
 114 #endif /* DLT_USB_LINUX_MMAPPED */
 115 #ifdef DLT_SYMANTEC_FIREWALL
 116         { symantec_if_print,    DLT_SYMANTEC_FIREWALL },
 117 #endif
 118 #ifdef DLT_C_HDLC
 119         { chdlc_if_print,       DLT_C_HDLC },
 120 #endif
 121 #ifdef DLT_HDLC
 122         { chdlc_if_print,       DLT_HDLC },
 123 #endif
 124 #ifdef DLT_PPP_ETHER
 125         { pppoe_if_print,       DLT_PPP_ETHER },
 126 #endif
 127 #if defined(DLT_PFLOG) && defined(HAVE_NET_IF_PFLOG_H)
 128         { pflog_if_print,       DLT_PFLOG },
 129 #endif
 130         { token_if_print,       DLT_IEEE802 },
 131         { fddi_if_print,        DLT_FDDI },
 132 #ifdef DLT_LINUX_SLL
 133         { sll_if_print,         DLT_LINUX_SLL },
 134 #endif
 135 #ifdef DLT_LINUX_SLL2
 136         { sll2_if_print,        DLT_LINUX_SLL2 },
 137 #endif
 138 #ifdef DLT_FR
 139         { fr_if_print,          DLT_FR },
 140 #endif
 141 #ifdef DLT_FRELAY
 142         { fr_if_print,          DLT_FRELAY },
 143 #endif
 144 #ifdef DLT_MFR
 145         { mfr_if_print,         DLT_MFR },
 146 #endif
 147         { atm_if_print,         DLT_ATM_RFC1483 },
 148 #ifdef DLT_SUNATM
 149         { sunatm_if_print,      DLT_SUNATM },
 150 #endif
 151 #ifdef DLT_ENC
 152         { enc_if_print,         DLT_ENC },
 153 #endif
 154         { sl_if_print,          DLT_SLIP },
 155 #ifdef DLT_SLIP_BSDOS
 156         { sl_bsdos_if_print,    DLT_SLIP_BSDOS },
 157 #endif
 158 #ifdef DLT_LTALK
 159         { ltalk_if_print,       DLT_LTALK },
 160 #endif
 161 #ifdef DLT_JUNIPER_ATM1
 162         { juniper_atm1_if_print, DLT_JUNIPER_ATM1 },
 163 #endif
 164 #ifdef DLT_JUNIPER_ATM2
 165         { juniper_atm2_if_print, DLT_JUNIPER_ATM2 },
 166 #endif
 167 #ifdef DLT_JUNIPER_MFR
 168         { juniper_mfr_if_print, DLT_JUNIPER_MFR },
 169 #endif
 170 #ifdef DLT_JUNIPER_MLFR
 171         { juniper_mlfr_if_print, DLT_JUNIPER_MLFR },
 172 #endif
 173 #ifdef DLT_JUNIPER_MLPPP
 174         { juniper_mlppp_if_print, DLT_JUNIPER_MLPPP },
 175 #endif
 176 #ifdef DLT_JUNIPER_PPPOE
 177         { juniper_pppoe_if_print, DLT_JUNIPER_PPPOE },
 178 #endif
 179 #ifdef DLT_JUNIPER_PPPOE_ATM
 180         { juniper_pppoe_atm_if_print, DLT_JUNIPER_PPPOE_ATM },
 181 #endif
 182 #ifdef DLT_JUNIPER_GGSN
 183         { juniper_ggsn_if_print, DLT_JUNIPER_GGSN },
 184 #endif
 185 #ifdef DLT_JUNIPER_ES
 186         { juniper_es_if_print,  DLT_JUNIPER_ES },
 187 #endif
 188 #ifdef DLT_JUNIPER_MONITOR
 189         { juniper_monitor_if_print, DLT_JUNIPER_MONITOR },
 190 #endif
 191 #ifdef DLT_JUNIPER_SERVICES
 192         { juniper_services_if_print, DLT_JUNIPER_SERVICES },
 193 #endif
 194 #ifdef DLT_JUNIPER_ETHER
 195         { juniper_ether_if_print,       DLT_JUNIPER_ETHER },
 196 #endif
 197 #ifdef DLT_JUNIPER_PPP
 198         { juniper_ppp_if_print, DLT_JUNIPER_PPP },
 199 #endif
 200 #ifdef DLT_JUNIPER_FRELAY
 201         { juniper_frelay_if_print,      DLT_JUNIPER_FRELAY },
 202 #endif
 203 #ifdef DLT_JUNIPER_CHDLC
 204         { juniper_chdlc_if_print,       DLT_JUNIPER_CHDLC },
 205 #endif
 206 #ifdef DLT_PKTAP
 207         { pktap_if_print,       DLT_PKTAP },
 208 #endif
 209 #ifdef DLT_IEEE802_11_RADIO
 210         { ieee802_11_radio_if_print,    DLT_IEEE802_11_RADIO },
 211 #endif
 212 #ifdef DLT_IEEE802_11
 213         { ieee802_11_if_print,  DLT_IEEE802_11},
 214 #endif
 215 #ifdef DLT_IEEE802_11_RADIO_AVS
 216         { ieee802_11_radio_avs_if_print,        DLT_IEEE802_11_RADIO_AVS },
 217 #endif
 218 #ifdef DLT_PRISM_HEADER
 219         { prism_if_print,       DLT_PRISM_HEADER },
 220 #endif
 221         { ppp_if_print,         DLT_PPP },
 222 #ifdef DLT_PPP_WITHDIRECTION
 223         { ppp_if_print,         DLT_PPP_WITHDIRECTION },
 224 #endif
 225 #ifdef DLT_PPP_BSDOS
 226         { ppp_bsdos_if_print,   DLT_PPP_BSDOS },
 227 #endif
 228 #ifdef DLT_PPP_SERIAL
 229         { ppp_hdlc_if_print,    DLT_PPP_SERIAL },
 230 #endif
 231 #ifdef DLT_DSA_TAG_BRCM
 232         { brcm_tag_if_print,    DLT_DSA_TAG_BRCM },
 233 #endif
 234 #ifdef DLT_DSA_TAG_BRCM_PREPEND
 235         { brcm_tag_prepend_if_print, DLT_DSA_TAG_BRCM_PREPEND },
 236 #endif
 237         { NULL,                 0 },
 238 };
 239
 240 static void     ndo_default_print(netdissect_options *ndo, const u_char *bp,
 241                     u_int length);
 242
 243 static void NORETURN ndo_error(netdissect_options *ndo,
 244                      status_exit_codes_t status,
 245                      FORMAT_STRING(const char *fmt), ...)
 246                      PRINTFLIKE(3, 4);
 247 static void     ndo_warning(netdissect_options *ndo,
 248                     FORMAT_STRING(const char *fmt), ...)
 249                     PRINTFLIKE(2, 3);
 250
 251 static int      ndo_printf(netdissect_options *ndo,
 252                      FORMAT_STRING(const char *fmt), ...)
 253                      PRINTFLIKE(2, 3);
 254
 255 void
 256 init_print(netdissect_options *ndo, uint32_t localnet, uint32_t mask)
 257 {
 258
 259         init_addrtoname(ndo, localnet, mask);
 260         init_checksum();
 261 }
 262
 263 if_printer
 264 lookup_printer(int type)
 265 {
 266         const struct printer *p;
 267
 268         for (p = printers; p->f; ++p)
 269                 if (type == p->type)
 270                         return p->f;
 271
 272 #if defined(DLT_USER2) && defined(DLT_PKTAP)
 273         /*
 274          * Apple incorrectly chose to use DLT_USER2 for their PKTAP
 275          * header.
 276          *
 277          * We map DLT_PKTAP, whether it's DLT_USER2 as it is on Darwin-
 278          * based OSes or the same value as LINKTYPE_PKTAP as it is on
 279          * other OSes, to LINKTYPE_PKTAP, so files written with
 280          * this version of libpcap for a DLT_PKTAP capture have a link-
 281          * layer header type of LINKTYPE_PKTAP.
 282          *
 283          * However, files written on OS X Mavericks for a DLT_PKTAP
 284          * capture have a link-layer header type of LINKTYPE_USER2.
 285          * If we don't have a printer for DLT_USER2, and type is
 286          * DLT_USER2, we look up the printer for DLT_PKTAP and use
 287          * that.
 288          */
 289         if (type == DLT_USER2) {
 290                 for (p = printers; p->f; ++p)
 291                         if (DLT_PKTAP == p->type)
 292                                 return p->f;
 293         }
 294 #endif
 295
 296         return NULL;
 297         /* NOTREACHED */
 298 }
 299
 300 int
 301 has_printer(int type)
 302 {
 303         return (lookup_printer(type) != NULL);
 304 }
 305
 306 if_printer
 307 get_if_printer(netdissect_options *ndo, int type)
 308 {
 309         const char *dltname;
 310         if_printer printer;
 311
 312         printer = lookup_printer(type);
 313         if (printer == NULL) {
 314                 dltname = pcap_datalink_val_to_name(type);
 315                 if (dltname != NULL)
 316                         (*ndo->ndo_error)(ndo, S_ERR_ND_NO_PRINTER,
 317                                           "packet printing is not supported for link type %s: use -w",
 318                                           dltname);
 319                 else
 320                         (*ndo->ndo_error)(ndo, S_ERR_ND_NO_PRINTER,
 321                                           "packet printing is not supported for link type %d: use -w", type);
 322         }
 323         return printer;
 324 }
 325
 326 void
 327 pretty_print_packet(netdissect_options *ndo, const struct pcap_pkthdr *h,
 328                     const u_char *sp, u_int packets_captured)
 329 {
 330         u_int hdrlen = 0;
 331         int invalid_header = 0;
 332
 333         if (ndo->ndo_packet_number)
 334                 ND_PRINT("%5u  ", packets_captured);
 335
 336         /* Sanity checks on packet length / capture length */
 337         if (h->caplen == 0) {
 338                 invalid_header = 1;
 339                 ND_PRINT("[Invalid header: caplen==0");
 340         }
 341         if (h->len == 0) {
 342                 if (!invalid_header) {
 343                         invalid_header = 1;
 344                         ND_PRINT("[Invalid header:");
 345                 } else
 346                         ND_PRINT(",");
 347                 ND_PRINT(" len==0");
 348         } else if (h->len < h->caplen) {
 349                 if (!invalid_header) {
 350                         invalid_header = 1;
 351                         ND_PRINT("[Invalid header:");
 352                 } else
 353                         ND_PRINT(",");
 354                 ND_PRINT(" len(%u) < caplen(%u)", h->len, h->caplen);
 355         }
 356         if (h->caplen > MAXIMUM_SNAPLEN) {
 357                 if (!invalid_header) {
 358                         invalid_header = 1;
 359                         ND_PRINT("[Invalid header:");
 360                 } else
 361                         ND_PRINT(",");
 362                 ND_PRINT(" caplen(%u) > %u", h->caplen, MAXIMUM_SNAPLEN);
 363         }
 364         if (h->len > MAXIMUM_SNAPLEN) {
 365                 if (!invalid_header) {
 366                         invalid_header = 1;
 367                         ND_PRINT("[Invalid header:");
 368                 } else
 369                         ND_PRINT(",");
 370                 ND_PRINT(" len(%u) > %u", h->len, MAXIMUM_SNAPLEN);
 371         }
 372         if (invalid_header) {
 373                 ND_PRINT("]\n");
 374                 return;
 375         }
 376
 377         /*
 378          * At this point:
 379          *   capture length != 0,
 380          *   packet length != 0,
 381          *   capture length <= MAXIMUM_SNAPLEN,
 382          *   packet length <= MAXIMUM_SNAPLEN,
 383          *   packet length >= capture length.
 384          *
 385          * Currently, there is no D-Bus printer, thus no need for
 386          * bigger lengths.
 387          */
 388
 389         ts_print(ndo, &h->ts);
 390
 391         /*
 392          * Printers must check that they're not walking off the end of
 393          * the packet.
 394          * Rather than pass it all the way down, we set this member
 395          * of the netdissect_options structure.
 396          */
 397         ndo->ndo_snapend = sp + h->caplen;
 398
 399         ndo->ndo_protocol = "";
 400         if (setjmp(ndo->ndo_truncated) == 0) {
 401                 /* Print the packet. */
 402                 hdrlen = (ndo->ndo_if_printer)(ndo, h, sp);
 403         } else {
 404                 /* A printer quit because the packet was truncated; report it */
 405                 ND_PRINT(" [|%s]", ndo->ndo_protocol);
 406         }
 407
 408         /*
 409          * Free all pushed buffers; if we got here by a printer quitting,
 410          * we need to release anything that didn't get released because
 411          * we longjmped out of the code before it popped a buffer.
 412          */
 413         nd_pop_all_buffers(ndo);
 414
 415         /*
 416          * Restore the original snapend, as a printer might have
 417          * changed it.
 418          */
 419         ndo->ndo_snapend = sp + h->caplen;
 420         if (ndo->ndo_Xflag) {
 421                 /*
 422                  * Print the raw packet data in hex and ASCII.
 423                  */
 424                 if (ndo->ndo_Xflag > 1) {
 425                         /*
 426                          * Include the link-layer header.
 427                          */
 428                         hex_and_ascii_print(ndo, "\n\t", sp, h->caplen);
 429                 } else {
 430                         /*
 431                          * Don't include the link-layer header - and if
 432                          * we have nothing past the link-layer header,
 433                          * print nothing.
 434                          */
 435                         if (h->caplen > hdrlen)
 436                                 hex_and_ascii_print(ndo, "\n\t", sp + hdrlen,
 437                                                     h->caplen - hdrlen);
 438                 }
 439         } else if (ndo->ndo_xflag) {
 440                 /*
 441                  * Print the raw packet data in hex.
 442                  */
 443                 if (ndo->ndo_xflag > 1) {
 444                         /*
 445                          * Include the link-layer header.
 446                          */
 447                         hex_print(ndo, "\n\t", sp, h->caplen);
 448                 } else {
 449                         /*
 450                          * Don't include the link-layer header - and if
 451                          * we have nothing past the link-layer header,
 452                          * print nothing.
 453                          */
 454                         if (h->caplen > hdrlen)
 455                                 hex_print(ndo, "\n\t", sp + hdrlen,
 456                                           h->caplen - hdrlen);
 457                 }
 458         } else if (ndo->ndo_Aflag) {
 459                 /*
 460                  * Print the raw packet data in ASCII.
 461                  */
 462                 if (ndo->ndo_Aflag > 1) {
 463                         /*
 464                          * Include the link-layer header.
 465                          */
 466                         ascii_print(ndo, sp, h->caplen);
 467                 } else {
 468                         /*
 469                          * Don't include the link-layer header - and if
 470                          * we have nothing past the link-layer header,
 471                          * print nothing.
 472                          */
 473                         if (h->caplen > hdrlen)
 474                                 ascii_print(ndo, sp + hdrlen, h->caplen - hdrlen);
 475                 }
 476         }
 477
 478         ND_PRINT("\n");
 479         nd_free_all(ndo);
 480 }
 481
 482 /*
 483  * By default, print the specified data out in hex and ASCII.
 484  */
 485 static void
 486 ndo_default_print(netdissect_options *ndo, const u_char *bp, u_int length)
 487 {
 488         hex_and_ascii_print(ndo, "\n\t", bp, length); /* pass on lf and indentation string */
 489 }
 490
 491 /* VARARGS */
 492 static void
 493 ndo_error(netdissect_options *ndo, status_exit_codes_t status,
 494           const char *fmt, ...)
 495 {
 496         va_list ap;
 497
 498         if (ndo->program_name)
 499                 (void)fprintf(stderr, "%s: ", ndo->program_name);
 500         va_start(ap, fmt);
 501         (void)vfprintf(stderr, fmt, ap);
 502         va_end(ap);
 503         if (*fmt) {
 504                 fmt += strlen(fmt);
 505                 if (fmt[-1] != '\n')
 506                         (void)fputc('\n', stderr);
 507         }
 508         nd_cleanup();
 509         exit(status);
 510         /* NOTREACHED */
 511 }
 512
 513 /* VARARGS */
 514 static void
 515 ndo_warning(netdissect_options *ndo, const char *fmt, ...)
 516 {
 517         va_list ap;
 518
 519         if (ndo->program_name)
 520                 (void)fprintf(stderr, "%s: ", ndo->program_name);
 521         (void)fprintf(stderr, "WARNING: ");
 522         va_start(ap, fmt);
 523         (void)vfprintf(stderr, fmt, ap);
 524         va_end(ap);
 525         if (*fmt) {
 526                 fmt += strlen(fmt);
 527                 if (fmt[-1] != '\n')
 528                         (void)fputc('\n', stderr);
 529         }
 530 }
 531
 532 static int
 533 ndo_printf(netdissect_options *ndo, const char *fmt, ...)
 534 {
 535         va_list args;
 536         int ret;
 537
 538         va_start(args, fmt);
 539         ret = vfprintf(stdout, fmt, args);
 540         va_end(args);
 541
 542         if (ret < 0)
 543                 ndo_error(ndo, S_ERR_ND_WRITE_FILE,
 544                           "Unable to write output: %s", pcap_strerror(errno));
 545         return (ret);
 546 }
 547
 548 void
 549 ndo_set_function_pointers(netdissect_options *ndo)
 550 {
 551         ndo->ndo_default_print=ndo_default_print;
 552         ndo->ndo_printf=ndo_printf;
 553         ndo->ndo_error=ndo_error;
 554         ndo->ndo_warning=ndo_warning;
 555 }