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 #ifdef DLT_DSA_TAG_BRCM
 228         { brcm_tag_if_print,    DLT_DSA_TAG_BRCM },
 229 #endif
 230 #ifdef DLT_DSA_TAG_BRCM_PREPEND
 231         { brcm_tag_prepend_if_print, DLT_DSA_TAG_BRCM_PREPEND },
 232 #endif
 233         { NULL,                 0 },
 234 };
 235
 236 static void     ndo_default_print(netdissect_options *ndo, const u_char *bp,
 237                     u_int length);
 238
 239 static void NORETURN ndo_error(netdissect_options *ndo,
 240                      status_exit_codes_t status,
 241                      FORMAT_STRING(const char *fmt), ...)
 242                      PRINTFLIKE(3, 4);
 243 static void     ndo_warning(netdissect_options *ndo,
 244                     FORMAT_STRING(const char *fmt), ...)
 245                     PRINTFLIKE(2, 3);
 246
 247 static int      ndo_printf(netdissect_options *ndo,
 248                      FORMAT_STRING(const char *fmt), ...)
 249                      PRINTFLIKE(2, 3);
 250
 251 void
 252 init_print(netdissect_options *ndo, uint32_t localnet, uint32_t mask)
 253 {
 254
 255         init_addrtoname(ndo, localnet, mask);
 256         init_checksum();
 257 }
 258
 259 if_printer
 260 lookup_printer(int type)
 261 {
 262         const struct printer *p;
 263
 264         for (p = printers; p->f; ++p)
 265                 if (type == p->type)
 266                         return p->f;
 267
 268 #if defined(DLT_USER2) && defined(DLT_PKTAP)
 269         /*
 270          * Apple incorrectly chose to use DLT_USER2 for their PKTAP
 271          * header.
 272          *
 273          * We map DLT_PKTAP, whether it's DLT_USER2 as it is on Darwin-
 274          * based OSes or the same value as LINKTYPE_PKTAP as it is on
 275          * other OSes, to LINKTYPE_PKTAP, so files written with
 276          * this version of libpcap for a DLT_PKTAP capture have a link-
 277          * layer header type of LINKTYPE_PKTAP.
 278          *
 279          * However, files written on OS X Mavericks for a DLT_PKTAP
 280          * capture have a link-layer header type of LINKTYPE_USER2.
 281          * If we don't have a printer for DLT_USER2, and type is
 282          * DLT_USER2, we look up the printer for DLT_PKTAP and use
 283          * that.
 284          */
 285         if (type == DLT_USER2) {
 286                 for (p = printers; p->f; ++p)
 287                         if (DLT_PKTAP == p->type)
 288                                 return p->f;
 289         }
 290 #endif
 291
 292         return NULL;
 293         /* NOTREACHED */
 294 }
 295
 296 int
 297 has_printer(int type)
 298 {
 299         return (lookup_printer(type) != NULL);
 300 }
 301
 302 if_printer
 303 get_if_printer(netdissect_options *ndo, int type)
 304 {
 305         const char *dltname;
 306         if_printer printer;
 307
 308         printer = lookup_printer(type);
 309         if (printer == NULL) {
 310                 dltname = pcap_datalink_val_to_name(type);
 311                 if (dltname != NULL)
 312                         (*ndo->ndo_error)(ndo, S_ERR_ND_NO_PRINTER,
 313                                           "packet printing is not supported for link type %s: use -w",
 314                                           dltname);
 315                 else
 316                         (*ndo->ndo_error)(ndo, S_ERR_ND_NO_PRINTER,
 317                                           "packet printing is not supported for link type %d: use -w", type);
 318         }
 319         return printer;
 320 }
 321
 322 void
 323 pretty_print_packet(netdissect_options *ndo, const struct pcap_pkthdr *h,
 324                     const u_char *sp, u_int packets_captured)
 325 {
 326         u_int hdrlen;
 327         int invalid_header = 0;
 328
 329         if (ndo->ndo_packet_number)
 330                 ND_PRINT("%5u  ", packets_captured);
 331
 332         /* Sanity checks on packet length / capture length */
 333         if (h->caplen == 0) {
 334                 invalid_header = 1;
 335                 ND_PRINT("[Invalid header: caplen==0");
 336         }
 337         if (h->len == 0) {
 338                 if (!invalid_header) {
 339                         invalid_header = 1;
 340                         ND_PRINT("[Invalid header:");
 341                 } else
 342                         ND_PRINT(",");
 343                 ND_PRINT(" len==0");
 344         } else if (h->len < h->caplen) {
 345                 if (!invalid_header) {
 346                         invalid_header = 1;
 347                         ND_PRINT("[Invalid header:");
 348                 } else
 349                         ND_PRINT(",");
 350                 ND_PRINT(" len(%u) < caplen(%u)", h->len, h->caplen);
 351         }
 352         if (h->caplen > MAXIMUM_SNAPLEN) {
 353                 if (!invalid_header) {
 354                         invalid_header = 1;
 355                         ND_PRINT("[Invalid header:");
 356                 } else
 357                         ND_PRINT(",");
 358                 ND_PRINT(" caplen(%u) > %u", h->caplen, MAXIMUM_SNAPLEN);
 359         }
 360         if (h->len > MAXIMUM_SNAPLEN) {
 361                 if (!invalid_header) {
 362                         invalid_header = 1;
 363                         ND_PRINT("[Invalid header:");
 364                 } else
 365                         ND_PRINT(",");
 366                 ND_PRINT(" len(%u) > %u", h->len, MAXIMUM_SNAPLEN);
 367         }
 368         if (invalid_header) {
 369                 ND_PRINT("]\n");
 370                 return;
 371         }
 372
 373         /*
 374          * At this point:
 375          *   capture length != 0,
 376          *   packet length != 0,
 377          *   capture length <= MAXIMUM_SNAPLEN,
 378          *   packet length <= MAXIMUM_SNAPLEN,
 379          *   packet length >= capture length.
 380          *
 381          * Currently, there is no D-Bus printer, thus no need for
 382          * bigger lengths.
 383          */
 384
 385         ts_print(ndo, &h->ts);
 386
 387         /*
 388          * Printers must check that they're not walking off the end of
 389          * the packet.
 390          * Rather than pass it all the way down, we set this member
 391          * of the netdissect_options structure.
 392          */
 393         ndo->ndo_snapend = sp + h->caplen;
 394
 395         hdrlen = (ndo->ndo_if_printer)(ndo, h, sp);
 396
 397         /*
 398          * Restore the original snapend, as a printer might have
 399          * changed it.
 400          */
 401         ndo->ndo_snapend = sp + h->caplen;
 402         if (ndo->ndo_Xflag) {
 403                 /*
 404                  * Print the raw packet data in hex and ASCII.
 405                  */
 406                 if (ndo->ndo_Xflag > 1) {
 407                         /*
 408                          * Include the link-layer header.
 409                          */
 410                         hex_and_ascii_print(ndo, "\n\t", sp, h->caplen);
 411                 } else {
 412                         /*
 413                          * Don't include the link-layer header - and if
 414                          * we have nothing past the link-layer header,
 415                          * print nothing.
 416                          */
 417                         if (h->caplen > hdrlen)
 418                                 hex_and_ascii_print(ndo, "\n\t", sp + hdrlen,
 419                                                     h->caplen - hdrlen);
 420                 }
 421         } else if (ndo->ndo_xflag) {
 422                 /*
 423                  * Print the raw packet data in hex.
 424                  */
 425                 if (ndo->ndo_xflag > 1) {
 426                         /*
 427                          * Include the link-layer header.
 428                          */
 429                         hex_print(ndo, "\n\t", sp, h->caplen);
 430                 } else {
 431                         /*
 432                          * Don't include the link-layer header - and if
 433                          * we have nothing past the link-layer header,
 434                          * print nothing.
 435                          */
 436                         if (h->caplen > hdrlen)
 437                                 hex_print(ndo, "\n\t", sp + hdrlen,
 438                                           h->caplen - hdrlen);
 439                 }
 440         } else if (ndo->ndo_Aflag) {
 441                 /*
 442                  * Print the raw packet data in ASCII.
 443                  */
 444                 if (ndo->ndo_Aflag > 1) {
 445                         /*
 446                          * Include the link-layer header.
 447                          */
 448                         ascii_print(ndo, sp, h->caplen);
 449                 } else {
 450                         /*
 451                          * Don't include the link-layer header - and if
 452                          * we have nothing past the link-layer header,
 453                          * print nothing.
 454                          */
 455                         if (h->caplen > hdrlen)
 456                                 ascii_print(ndo, sp + hdrlen, h->caplen - hdrlen);
 457                 }
 458         }
 459
 460         ND_PRINT("\n");
 461         nd_free_all(ndo);
 462 }
 463
 464 /*
 465  * By default, print the specified data out in hex and ASCII.
 466  */
 467 static void
 468 ndo_default_print(netdissect_options *ndo, const u_char *bp, u_int length)
 469 {
 470         hex_and_ascii_print(ndo, "\n\t", bp, length); /* pass on lf and indentation string */
 471 }
 472
 473 /* VARARGS */
 474 static void
 475 ndo_error(netdissect_options *ndo, status_exit_codes_t status,
 476           const char *fmt, ...)
 477 {
 478         va_list ap;
 479
 480         if (ndo->program_name)
 481                 (void)fprintf(stderr, "%s: ", ndo->program_name);
 482         va_start(ap, fmt);
 483         (void)vfprintf(stderr, fmt, ap);
 484         va_end(ap);
 485         if (*fmt) {
 486                 fmt += strlen(fmt);
 487                 if (fmt[-1] != '\n')
 488                         (void)fputc('\n', stderr);
 489         }
 490         nd_cleanup();
 491         exit(status);
 492         /* NOTREACHED */
 493 }
 494
 495 /* VARARGS */
 496 static void
 497 ndo_warning(netdissect_options *ndo, const char *fmt, ...)
 498 {
 499         va_list ap;
 500
 501         if (ndo->program_name)
 502                 (void)fprintf(stderr, "%s: ", ndo->program_name);
 503         (void)fprintf(stderr, "WARNING: ");
 504         va_start(ap, fmt);
 505         (void)vfprintf(stderr, fmt, ap);
 506         va_end(ap);
 507         if (*fmt) {
 508                 fmt += strlen(fmt);
 509                 if (fmt[-1] != '\n')
 510                         (void)fputc('\n', stderr);
 511         }
 512 }
 513
 514 static int
 515 ndo_printf(netdissect_options *ndo, const char *fmt, ...)
 516 {
 517         va_list args;
 518         int ret;
 519
 520         va_start(args, fmt);
 521         ret = vfprintf(stdout, fmt, args);
 522         va_end(args);
 523
 524         if (ret < 0)
 525                 ndo_error(ndo, S_ERR_ND_WRITE_FILE,
 526                           "Unable to write output: %s", pcap_strerror(errno));
 527         return (ret);
 528 }
 529
 530 void
 531 ndo_set_function_pointers(netdissect_options *ndo)
 532 {
 533         ndo->ndo_default_print=ndo_default_print;
 534         ndo->ndo_printf=ndo_printf;
 535         ndo->ndo_error=ndo_error;
 536         ndo->ndo_warning=ndo_warning;
 537 }