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
  35 #include "netdissect-stdinc.h"
  36
  37 #include "netdissect.h"
  38 #include "addrtoname.h"
  39 #include "print.h"
  40 #include "netdissect-alloc.h"
  41
  42 #include "pcap-missing.h"
  43
  44 struct printer {
  45         if_printer f;
  46         int type;
  47 };
  48
  49 static const struct printer printers[] = {
  50         { ether_if_print,       DLT_EN10MB },
  51 #ifdef DLT_IPNET
  52         { ipnet_if_print,       DLT_IPNET },
  53 #endif
  54 #ifdef DLT_IEEE802_15_4
  55         { ieee802_15_4_if_print, DLT_IEEE802_15_4 },
  56 #endif
  57 #ifdef DLT_IEEE802_15_4_NOFCS
  58         { ieee802_15_4_if_print, DLT_IEEE802_15_4_NOFCS },
  59 #endif
  60 #ifdef DLT_PPI
  61         { ppi_if_print,         DLT_PPI },
  62 #endif
  63 #ifdef DLT_NETANALYZER
  64         { netanalyzer_if_print, DLT_NETANALYZER },
  65 #endif
  66 #ifdef DLT_NETANALYZER_TRANSPARENT
  67         { netanalyzer_transparent_if_print, DLT_NETANALYZER_TRANSPARENT },
  68 #endif
  69 #ifdef DLT_NFLOG
  70         { nflog_if_print,       DLT_NFLOG},
  71 #endif
  72 #ifdef DLT_CIP
  73         { cip_if_print,         DLT_CIP },
  74 #endif
  75 #ifdef DLT_ATM_CLIP
  76         { cip_if_print,         DLT_ATM_CLIP },
  77 #endif
  78 #ifdef DLT_IP_OVER_FC
  79         { ipfc_if_print,        DLT_IP_OVER_FC },
  80 #endif
  81         { null_if_print,        DLT_NULL },
  82 #ifdef DLT_LOOP
  83         { null_if_print,        DLT_LOOP },
  84 #endif
  85 #ifdef DLT_APPLE_IP_OVER_IEEE1394
  86         { ap1394_if_print,      DLT_APPLE_IP_OVER_IEEE1394 },
  87 #endif
  88 #ifdef DLT_BLUETOOTH_HCI_H4_WITH_PHDR
  89         { bt_if_print,          DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
  90 #endif
  91 #ifdef DLT_LANE8023
  92         { lane_if_print,        DLT_LANE8023 },
  93 #endif
  94         { arcnet_if_print,      DLT_ARCNET },
  95 #ifdef DLT_ARCNET_LINUX
  96         { arcnet_linux_if_print, DLT_ARCNET_LINUX },
  97 #endif
  98         { raw_if_print,         DLT_RAW },
  99 #ifdef DLT_IPV4
 100         { raw_if_print,         DLT_IPV4 },
 101 #endif
 102 #ifdef DLT_IPV6
 103         { raw_if_print,         DLT_IPV6 },
 104 #endif
 105 #ifdef DLT_USB_LINUX
 106         { usb_linux_48_byte_if_print, DLT_USB_LINUX},
 107 #endif /* DLT_USB_LINUX */
 108 #ifdef DLT_USB_LINUX_MMAPPED
 109         { usb_linux_64_byte_if_print, DLT_USB_LINUX_MMAPPED},
 110 #endif /* DLT_USB_LINUX_MMAPPED */
 111 #ifdef DLT_SYMANTEC_FIREWALL
 112         { symantec_if_print,    DLT_SYMANTEC_FIREWALL },
 113 #endif
 114 #ifdef DLT_C_HDLC
 115         { chdlc_if_print,       DLT_C_HDLC },
 116 #endif
 117 #ifdef DLT_HDLC
 118         { chdlc_if_print,       DLT_HDLC },
 119 #endif
 120 #ifdef DLT_PPP_ETHER
 121         { pppoe_if_print,       DLT_PPP_ETHER },
 122 #endif
 123 #if defined(DLT_PFLOG) && defined(HAVE_NET_IF_PFLOG_H)
 124         { pflog_if_print,       DLT_PFLOG },
 125 #endif
 126         { token_if_print,       DLT_IEEE802 },
 127         { fddi_if_print,        DLT_FDDI },
 128 #ifdef DLT_LINUX_SLL
 129         { sll_if_print,         DLT_LINUX_SLL },
 130 #endif
 131 #ifdef DLT_LINUX_SLL2
 132         { sll2_if_print,        DLT_LINUX_SLL2 },
 133 #endif
 134 #ifdef DLT_FR
 135         { fr_if_print,          DLT_FR },
 136 #endif
 137 #ifdef DLT_FRELAY
 138         { fr_if_print,          DLT_FRELAY },
 139 #endif
 140 #ifdef DLT_MFR
 141         { mfr_if_print,         DLT_MFR },
 142 #endif
 143         { atm_if_print,         DLT_ATM_RFC1483 },
 144 #ifdef DLT_SUNATM
 145         { sunatm_if_print,      DLT_SUNATM },
 146 #endif
 147 #ifdef DLT_ENC
 148         { enc_if_print,         DLT_ENC },
 149 #endif
 150         { sl_if_print,          DLT_SLIP },
 151 #ifdef DLT_SLIP_BSDOS
 152         { sl_bsdos_if_print,    DLT_SLIP_BSDOS },
 153 #endif
 154 #ifdef DLT_LTALK
 155         { ltalk_if_print,       DLT_LTALK },
 156 #endif
 157 #ifdef DLT_JUNIPER_ATM1
 158         { juniper_atm1_if_print, DLT_JUNIPER_ATM1 },
 159 #endif
 160 #ifdef DLT_JUNIPER_ATM2
 161         { juniper_atm2_if_print, DLT_JUNIPER_ATM2 },
 162 #endif
 163 #ifdef DLT_JUNIPER_MFR
 164         { juniper_mfr_if_print, DLT_JUNIPER_MFR },
 165 #endif
 166 #ifdef DLT_JUNIPER_MLFR
 167         { juniper_mlfr_if_print, DLT_JUNIPER_MLFR },
 168 #endif
 169 #ifdef DLT_JUNIPER_MLPPP
 170         { juniper_mlppp_if_print, DLT_JUNIPER_MLPPP },
 171 #endif
 172 #ifdef DLT_JUNIPER_PPPOE
 173         { juniper_pppoe_if_print, DLT_JUNIPER_PPPOE },
 174 #endif
 175 #ifdef DLT_JUNIPER_PPPOE_ATM
 176         { juniper_pppoe_atm_if_print, DLT_JUNIPER_PPPOE_ATM },
 177 #endif
 178 #ifdef DLT_JUNIPER_GGSN
 179         { juniper_ggsn_if_print, DLT_JUNIPER_GGSN },
 180 #endif
 181 #ifdef DLT_JUNIPER_ES
 182         { juniper_es_if_print,  DLT_JUNIPER_ES },
 183 #endif
 184 #ifdef DLT_JUNIPER_MONITOR
 185         { juniper_monitor_if_print, DLT_JUNIPER_MONITOR },
 186 #endif
 187 #ifdef DLT_JUNIPER_SERVICES
 188         { juniper_services_if_print, DLT_JUNIPER_SERVICES },
 189 #endif
 190 #ifdef DLT_JUNIPER_ETHER
 191         { juniper_ether_if_print,       DLT_JUNIPER_ETHER },
 192 #endif
 193 #ifdef DLT_JUNIPER_PPP
 194         { juniper_ppp_if_print, DLT_JUNIPER_PPP },
 195 #endif
 196 #ifdef DLT_JUNIPER_FRELAY
 197         { juniper_frelay_if_print,      DLT_JUNIPER_FRELAY },
 198 #endif
 199 #ifdef DLT_JUNIPER_CHDLC
 200         { juniper_chdlc_if_print,       DLT_JUNIPER_CHDLC },
 201 #endif
 202 #ifdef DLT_PKTAP
 203         { pktap_if_print,       DLT_PKTAP },
 204 #endif
 205 #ifdef DLT_IEEE802_11_RADIO
 206         { ieee802_11_radio_if_print,    DLT_IEEE802_11_RADIO },
 207 #endif
 208 #ifdef DLT_IEEE802_11
 209         { ieee802_11_if_print,  DLT_IEEE802_11},
 210 #endif
 211 #ifdef DLT_IEEE802_11_RADIO_AVS
 212         { ieee802_11_radio_avs_if_print,        DLT_IEEE802_11_RADIO_AVS },
 213 #endif
 214 #ifdef DLT_PRISM_HEADER
 215         { prism_if_print,       DLT_PRISM_HEADER },
 216 #endif
 217         { ppp_if_print,         DLT_PPP },
 218 #ifdef DLT_PPP_WITHDIRECTION
 219         { ppp_if_print,         DLT_PPP_WITHDIRECTION },
 220 #endif
 221 #ifdef DLT_PPP_BSDOS
 222         { ppp_bsdos_if_print,   DLT_PPP_BSDOS },
 223 #endif
 224 #ifdef DLT_PPP_SERIAL
 225         { ppp_hdlc_if_print,    DLT_PPP_SERIAL },
 226 #endif
 227         { NULL,                 0 },
 228 };
 229
 230 static void     ndo_default_print(netdissect_options *ndo, const u_char *bp,
 231                     u_int length);
 232
 233 static void NORETURN ndo_error(netdissect_options *ndo,
 234                      status_exit_codes_t status,
 235                      FORMAT_STRING(const char *fmt), ...)
 236                      PRINTFLIKE(3, 4);
 237 static void     ndo_warning(netdissect_options *ndo,
 238                     FORMAT_STRING(const char *fmt), ...)
 239                     PRINTFLIKE(2, 3);
 240
 241 static int      ndo_printf(netdissect_options *ndo,
 242                      FORMAT_STRING(const char *fmt), ...)
 243                      PRINTFLIKE(2, 3);
 244
 245 void
 246 init_print(netdissect_options *ndo, uint32_t localnet, uint32_t mask)
 247 {
 248
 249         init_addrtoname(ndo, localnet, mask);
 250         init_checksum();
 251 }
 252
 253 if_printer
 254 lookup_printer(int type)
 255 {
 256         const struct printer *p;
 257
 258         for (p = printers; p->f; ++p)
 259                 if (type == p->type)
 260                         return p->f;
 261
 262 #if defined(DLT_USER2) && defined(DLT_PKTAP)
 263         /*
 264          * Apple incorrectly chose to use DLT_USER2 for their PKTAP
 265          * header.
 266          *
 267          * We map DLT_PKTAP, whether it's DLT_USER2 as it is on Darwin-
 268          * based OSes or the same value as LINKTYPE_PKTAP as it is on
 269          * other OSes, to LINKTYPE_PKTAP, so files written with
 270          * this version of libpcap for a DLT_PKTAP capture have a link-
 271          * layer header type of LINKTYPE_PKTAP.
 272          *
 273          * However, files written on OS X Mavericks for a DLT_PKTAP
 274          * capture have a link-layer header type of LINKTYPE_USER2.
 275          * If we don't have a printer for DLT_USER2, and type is
 276          * DLT_USER2, we look up the printer for DLT_PKTAP and use
 277          * that.
 278          */
 279         if (type == DLT_USER2) {
 280                 for (p = printers; p->f; ++p)
 281                         if (DLT_PKTAP == p->type)
 282                                 return p->f;
 283         }
 284 #endif
 285
 286         return NULL;
 287         /* NOTREACHED */
 288 }
 289
 290 int
 291 has_printer(int type)
 292 {
 293         return (lookup_printer(type) != NULL);
 294 }
 295
 296 if_printer
 297 get_if_printer(netdissect_options *ndo, int type)
 298 {
 299         const char *dltname;
 300         if_printer printer;
 301
 302         printer = lookup_printer(type);
 303         if (printer == NULL) {
 304                 dltname = pcap_datalink_val_to_name(type);
 305                 if (dltname != NULL)
 306                         (*ndo->ndo_error)(ndo, S_ERR_ND_NO_PRINTER,
 307                                           "packet printing is not supported for link type %s: use -w",
 308                                           dltname);
 309                 else
 310                         (*ndo->ndo_error)(ndo, S_ERR_ND_NO_PRINTER,
 311                                           "packet printing is not supported for link type %d: use -w", type);
 312         }
 313         return printer;
 314 }
 315
 316 void
 317 pretty_print_packet(netdissect_options *ndo, const struct pcap_pkthdr *h,
 318                     const u_char *sp, u_int packets_captured)
 319 {
 320         u_int hdrlen;
 321         int invalid_header = 0;
 322
 323         if (ndo->ndo_packet_number)
 324                 ND_PRINT("%5u  ", packets_captured);
 325
 326         /* Sanity checks on packet length / capture length */
 327         if (h->caplen == 0) {
 328                 invalid_header = 1;
 329                 ND_PRINT("[Invalid header: caplen==0");
 330         }
 331         if (h->len == 0) {
 332                 if (!invalid_header) {
 333                         invalid_header = 1;
 334                         ND_PRINT("[Invalid header:");
 335                 } else
 336                         ND_PRINT(",");
 337                 ND_PRINT(" len==0");
 338         } else if (h->len < h->caplen) {
 339                 if (!invalid_header) {
 340                         invalid_header = 1;
 341                         ND_PRINT("[Invalid header:");
 342                 } else
 343                         ND_PRINT(",");
 344                 ND_PRINT(" len(%u) < caplen(%u)", h->len, h->caplen);
 345         }
 346         if (h->caplen > MAXIMUM_SNAPLEN) {
 347                 if (!invalid_header) {
 348                         invalid_header = 1;
 349                         ND_PRINT("[Invalid header:");
 350                 } else
 351                         ND_PRINT(",");
 352                 ND_PRINT(" caplen(%u) > %u", h->caplen, MAXIMUM_SNAPLEN);
 353         }
 354         if (h->len > MAXIMUM_SNAPLEN) {
 355                 if (!invalid_header) {
 356                         invalid_header = 1;
 357                         ND_PRINT("[Invalid header:");
 358                 } else
 359                         ND_PRINT(",");
 360                 ND_PRINT(" len(%u) > %u", h->len, MAXIMUM_SNAPLEN);
 361         }
 362         if (invalid_header) {
 363                 ND_PRINT("]\n");
 364                 return;
 365         }
 366
 367         /*
 368          * At this point:
 369          *   capture length != 0,
 370          *   packet length != 0,
 371          *   capture length <= MAXIMUM_SNAPLEN,
 372          *   packet length <= MAXIMUM_SNAPLEN,
 373          *   packet length >= capture length.
 374          *
 375          * Currently, there is no D-Bus printer, thus no need for
 376          * bigger lengths.
 377          */
 378
 379         ts_print(ndo, &h->ts);
 380
 381         /*
 382          * Printers must check that they're not walking off the end of
 383          * the packet.
 384          * Rather than pass it all the way down, we set this member
 385          * of the netdissect_options structure.
 386          */
 387         ndo->ndo_snapend = sp + h->caplen;
 388
 389         hdrlen = (ndo->ndo_if_printer)(ndo, h, sp);
 390
 391         /*
 392          * Restore the original snapend, as a printer might have
 393          * changed it.
 394          */
 395         ndo->ndo_snapend = sp + h->caplen;
 396         if (ndo->ndo_Xflag) {
 397                 /*
 398                  * Print the raw packet data in hex and ASCII.
 399                  */
 400                 if (ndo->ndo_Xflag > 1) {
 401                         /*
 402                          * Include the link-layer header.
 403                          */
 404                         hex_and_ascii_print(ndo, "\n\t", sp, h->caplen);
 405                 } else {
 406                         /*
 407                          * Don't include the link-layer header - and if
 408                          * we have nothing past the link-layer header,
 409                          * print nothing.
 410                          */
 411                         if (h->caplen > hdrlen)
 412                                 hex_and_ascii_print(ndo, "\n\t", sp + hdrlen,
 413                                                     h->caplen - hdrlen);
 414                 }
 415         } else if (ndo->ndo_xflag) {
 416                 /*
 417                  * Print the raw packet data in hex.
 418                  */
 419                 if (ndo->ndo_xflag > 1) {
 420                         /*
 421                          * Include the link-layer header.
 422                          */
 423                         hex_print(ndo, "\n\t", sp, h->caplen);
 424                 } else {
 425                         /*
 426                          * Don't include the link-layer header - and if
 427                          * we have nothing past the link-layer header,
 428                          * print nothing.
 429                          */
 430                         if (h->caplen > hdrlen)
 431                                 hex_print(ndo, "\n\t", sp + hdrlen,
 432                                           h->caplen - hdrlen);
 433                 }
 434         } else if (ndo->ndo_Aflag) {
 435                 /*
 436                  * Print the raw packet data in ASCII.
 437                  */
 438                 if (ndo->ndo_Aflag > 1) {
 439                         /*
 440                          * Include the link-layer header.
 441                          */
 442                         ascii_print(ndo, sp, h->caplen);
 443                 } else {
 444                         /*
 445                          * Don't include the link-layer header - and if
 446                          * we have nothing past the link-layer header,
 447                          * print nothing.
 448                          */
 449                         if (h->caplen > hdrlen)
 450                                 ascii_print(ndo, sp + hdrlen, h->caplen - hdrlen);
 451                 }
 452         }
 453
 454         ND_PRINT("\n");
 455         nd_free_all(ndo);
 456 }
 457
 458 /*
 459  * By default, print the specified data out in hex and ASCII.
 460  */
 461 static void
 462 ndo_default_print(netdissect_options *ndo, const u_char *bp, u_int length)
 463 {
 464         hex_and_ascii_print(ndo, "\n\t", bp, length); /* pass on lf and indentation string */
 465 }
 466
 467 /* VARARGS */
 468 static void
 469 ndo_error(netdissect_options *ndo, status_exit_codes_t status,
 470           const char *fmt, ...)
 471 {
 472         va_list ap;
 473
 474         if (ndo->program_name)
 475                 (void)fprintf(stderr, "%s: ", ndo->program_name);
 476         va_start(ap, fmt);
 477         (void)vfprintf(stderr, fmt, ap);
 478         va_end(ap);
 479         if (*fmt) {
 480                 fmt += strlen(fmt);
 481                 if (fmt[-1] != '\n')
 482                         (void)fputc('\n', stderr);
 483         }
 484         nd_cleanup();
 485         exit(status);
 486         /* NOTREACHED */
 487 }
 488
 489 /* VARARGS */
 490 static void
 491 ndo_warning(netdissect_options *ndo, const char *fmt, ...)
 492 {
 493         va_list ap;
 494
 495         if (ndo->program_name)
 496                 (void)fprintf(stderr, "%s: ", ndo->program_name);
 497         (void)fprintf(stderr, "WARNING: ");
 498         va_start(ap, fmt);
 499         (void)vfprintf(stderr, fmt, ap);
 500         va_end(ap);
 501         if (*fmt) {
 502                 fmt += strlen(fmt);
 503                 if (fmt[-1] != '\n')
 504                         (void)fputc('\n', stderr);
 505         }
 506 }
 507
 508 static int
 509 ndo_printf(netdissect_options *ndo, const char *fmt, ...)
 510 {
 511         va_list args;
 512         int ret;
 513
 514         va_start(args, fmt);
 515         ret = vfprintf(stdout, fmt, args);
 516         va_end(args);
 517
 518         if (ret < 0)
 519                 ndo_error(ndo, S_ERR_ND_WRITE_FILE,
 520                           "Unable to write output: %s", pcap_strerror(errno));
 521         return (ret);
 522 }
 523
 524 void
 525 ndo_set_function_pointers(netdissect_options *ndo)
 526 {
 527         ndo->ndo_default_print=ndo_default_print;
 528         ndo->ndo_printf=ndo_printf;
 529         ndo->ndo_error=ndo_error;
 530         ndo->ndo_warning=ndo_warning;
 531 }