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
  41 struct printer {
  42         if_printer f;
  43         int type;
  44 };
  45
  46 static const struct printer printers[] = {
  47         { ether_if_print,       DLT_EN10MB },
  48 #ifdef DLT_IPNET
  49         { ipnet_if_print,       DLT_IPNET },
  50 #endif
  51 #ifdef DLT_IEEE802_15_4
  52         { ieee802_15_4_if_print, DLT_IEEE802_15_4 },
  53 #endif
  54 #ifdef DLT_IEEE802_15_4_NOFCS
  55         { ieee802_15_4_if_print, DLT_IEEE802_15_4_NOFCS },
  56 #endif
  57 #ifdef DLT_PPI
  58         { ppi_if_print,         DLT_PPI },
  59 #endif
  60 #ifdef DLT_NETANALYZER
  61         { netanalyzer_if_print, DLT_NETANALYZER },
  62 #endif
  63 #ifdef DLT_NETANALYZER_TRANSPARENT
  64         { netanalyzer_transparent_if_print, DLT_NETANALYZER_TRANSPARENT },
  65 #endif
  66 #if defined(DLT_NFLOG) && defined(HAVE_PCAP_NFLOG_H)
  67         { nflog_if_print,       DLT_NFLOG},
  68 #endif
  69 #ifdef DLT_CIP
  70         { cip_if_print,         DLT_CIP },
  71 #endif
  72 #ifdef DLT_ATM_CLIP
  73         { cip_if_print,         DLT_ATM_CLIP },
  74 #endif
  75 #ifdef DLT_IP_OVER_FC
  76         { ipfc_if_print,        DLT_IP_OVER_FC },
  77 #endif
  78         { null_if_print,        DLT_NULL },
  79 #ifdef DLT_LOOP
  80         { null_if_print,        DLT_LOOP },
  81 #endif
  82 #ifdef DLT_APPLE_IP_OVER_IEEE1394
  83         { ap1394_if_print,      DLT_APPLE_IP_OVER_IEEE1394 },
  84 #endif
  85 #if defined(DLT_BLUETOOTH_HCI_H4_WITH_PHDR) && defined(HAVE_PCAP_BLUETOOTH_H)
  86         { bt_if_print,          DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
  87 #endif
  88 #ifdef DLT_LANE8023
  89         { lane_if_print,        DLT_LANE8023 },
  90 #endif
  91         { arcnet_if_print,      DLT_ARCNET },
  92 #ifdef DLT_ARCNET_LINUX
  93         { arcnet_linux_if_print, DLT_ARCNET_LINUX },
  94 #endif
  95         { raw_if_print,         DLT_RAW },
  96 #ifdef DLT_IPV4
  97         { raw_if_print,         DLT_IPV4 },
  98 #endif
  99 #ifdef DLT_IPV6
 100         { raw_if_print,         DLT_IPV6 },
 101 #endif
 102 #ifdef DLT_USB_LINUX
 103         { usb_linux_48_byte_if_print, DLT_USB_LINUX},
 104 #endif /* DLT_USB_LINUX */
 105 #ifdef DLT_USB_LINUX_MMAPPED
 106         { usb_linux_64_byte_if_print, DLT_USB_LINUX_MMAPPED},
 107 #endif /* DLT_USB_LINUX_MMAPPED */
 108 #ifdef DLT_SYMANTEC_FIREWALL
 109         { symantec_if_print,    DLT_SYMANTEC_FIREWALL },
 110 #endif
 111 #ifdef DLT_C_HDLC
 112         { chdlc_if_print,       DLT_C_HDLC },
 113 #endif
 114 #ifdef DLT_HDLC
 115         { chdlc_if_print,       DLT_HDLC },
 116 #endif
 117 #ifdef DLT_PPP_ETHER
 118         { pppoe_if_print,       DLT_PPP_ETHER },
 119 #endif
 120 #if defined(DLT_PFLOG) && defined(HAVE_NET_IF_PFLOG_H)
 121         { pflog_if_print,       DLT_PFLOG },
 122 #endif
 123         { token_if_print,       DLT_IEEE802 },
 124         { fddi_if_print,        DLT_FDDI },
 125 #ifdef DLT_LINUX_SLL
 126         { sll_if_print,         DLT_LINUX_SLL },
 127 #endif
 128 #ifdef DLT_FR
 129         { fr_if_print,          DLT_FR },
 130 #endif
 131 #ifdef DLT_FRELAY
 132         { fr_if_print,          DLT_FRELAY },
 133 #endif
 134 #ifdef DLT_MFR
 135         { mfr_if_print,         DLT_MFR },
 136 #endif
 137         { atm_if_print,         DLT_ATM_RFC1483 },
 138 #ifdef DLT_SUNATM
 139         { sunatm_if_print,      DLT_SUNATM },
 140 #endif
 141 #ifdef DLT_ENC
 142         { enc_if_print,         DLT_ENC },
 143 #endif
 144         { sl_if_print,          DLT_SLIP },
 145 #ifdef DLT_SLIP_BSDOS
 146         { sl_bsdos_if_print,    DLT_SLIP_BSDOS },
 147 #endif
 148 #ifdef DLT_LTALK
 149         { ltalk_if_print,       DLT_LTALK },
 150 #endif
 151 #ifdef DLT_JUNIPER_ATM1
 152         { juniper_atm1_if_print, DLT_JUNIPER_ATM1 },
 153 #endif
 154 #ifdef DLT_JUNIPER_ATM2
 155         { juniper_atm2_if_print, DLT_JUNIPER_ATM2 },
 156 #endif
 157 #ifdef DLT_JUNIPER_MFR
 158         { juniper_mfr_if_print, DLT_JUNIPER_MFR },
 159 #endif
 160 #ifdef DLT_JUNIPER_MLFR
 161         { juniper_mlfr_if_print, DLT_JUNIPER_MLFR },
 162 #endif
 163 #ifdef DLT_JUNIPER_MLPPP
 164         { juniper_mlppp_if_print, DLT_JUNIPER_MLPPP },
 165 #endif
 166 #ifdef DLT_JUNIPER_PPPOE
 167         { juniper_pppoe_if_print, DLT_JUNIPER_PPPOE },
 168 #endif
 169 #ifdef DLT_JUNIPER_PPPOE_ATM
 170         { juniper_pppoe_atm_if_print, DLT_JUNIPER_PPPOE_ATM },
 171 #endif
 172 #ifdef DLT_JUNIPER_GGSN
 173         { juniper_ggsn_if_print, DLT_JUNIPER_GGSN },
 174 #endif
 175 #ifdef DLT_JUNIPER_ES
 176         { juniper_es_if_print,  DLT_JUNIPER_ES },
 177 #endif
 178 #ifdef DLT_JUNIPER_MONITOR
 179         { juniper_monitor_if_print, DLT_JUNIPER_MONITOR },
 180 #endif
 181 #ifdef DLT_JUNIPER_SERVICES
 182         { juniper_services_if_print, DLT_JUNIPER_SERVICES },
 183 #endif
 184 #ifdef DLT_JUNIPER_ETHER
 185         { juniper_ether_if_print,       DLT_JUNIPER_ETHER },
 186 #endif
 187 #ifdef DLT_JUNIPER_PPP
 188         { juniper_ppp_if_print, DLT_JUNIPER_PPP },
 189 #endif
 190 #ifdef DLT_JUNIPER_FRELAY
 191         { juniper_frelay_if_print,      DLT_JUNIPER_FRELAY },
 192 #endif
 193 #ifdef DLT_JUNIPER_CHDLC
 194         { juniper_chdlc_if_print,       DLT_JUNIPER_CHDLC },
 195 #endif
 196 #ifdef DLT_PKTAP
 197         { pktap_if_print,       DLT_PKTAP },
 198 #endif
 199 #ifdef DLT_IEEE802_11_RADIO
 200         { ieee802_11_radio_if_print,    DLT_IEEE802_11_RADIO },
 201 #endif
 202 #ifdef DLT_IEEE802_11
 203         { ieee802_11_if_print,  DLT_IEEE802_11},
 204 #endif
 205 #ifdef DLT_IEEE802_11_RADIO_AVS
 206         { ieee802_11_radio_avs_if_print,        DLT_IEEE802_11_RADIO_AVS },
 207 #endif
 208 #ifdef DLT_PRISM_HEADER
 209         { prism_if_print,       DLT_PRISM_HEADER },
 210 #endif
 211         { ppp_if_print,         DLT_PPP },
 212 #ifdef DLT_PPP_WITHDIRECTION
 213         { ppp_if_print,         DLT_PPP_WITHDIRECTION },
 214 #endif
 215 #ifdef DLT_PPP_BSDOS
 216         { ppp_bsdos_if_print,   DLT_PPP_BSDOS },
 217 #endif
 218 #ifdef DLT_PPP_SERIAL
 219         { ppp_hdlc_if_print,    DLT_PPP_SERIAL },
 220 #endif
 221         { NULL,                 0 },
 222 };
 223
 224 static void     ndo_default_print(netdissect_options *ndo, const u_char *bp,
 225                     u_int length);
 226
 227 static void NORETURN ndo_error(netdissect_options *ndo,
 228                      FORMAT_STRING(const char *fmt), ...)
 229                      PRINTFLIKE(2, 3);
 230 static void     ndo_warning(netdissect_options *ndo,
 231                     FORMAT_STRING(const char *fmt), ...)
 232                     PRINTFLIKE(2, 3);
 233
 234 static int      ndo_printf(netdissect_options *ndo,
 235                      FORMAT_STRING(const char *fmt), ...)
 236                      PRINTFLIKE(2, 3);
 237
 238 void
 239 init_print(netdissect_options *ndo, uint32_t localnet, uint32_t mask,
 240            uint32_t timezone_offset)
 241 {
 242
 243         thiszone = timezone_offset;
 244         init_addrtoname(ndo, localnet, mask);
 245         init_checksum();
 246 }
 247
 248 if_printer
 249 lookup_printer(int type)
 250 {
 251         const struct printer *p;
 252
 253         for (p = printers; p->f; ++p)
 254                 if (type == p->type)
 255                         return p->f;
 256
 257 #if defined(DLT_USER2) && defined(DLT_PKTAP)
 258         /*
 259          * Apple incorrectly chose to use DLT_USER2 for their PKTAP
 260          * header.
 261          *
 262          * We map DLT_PKTAP, whether it's DLT_USER2 as it is on Darwin-
 263          * based OSes or the same value as LINKTYPE_PKTAP as it is on
 264          * other OSes, to LINKTYPE_PKTAP, so files written with
 265          * this version of libpcap for a DLT_PKTAP capture have a link-
 266          * layer header type of LINKTYPE_PKTAP.
 267          *
 268          * However, files written on OS X Mavericks for a DLT_PKTAP
 269          * capture have a link-layer header type of LINKTYPE_USER2.
 270          * If we don't have a printer for DLT_USER2, and type is
 271          * DLT_USER2, we look up the printer for DLT_PKTAP and use
 272          * that.
 273          */
 274         if (type == DLT_USER2) {
 275                 for (p = printers; p->f; ++p)
 276                         if (DLT_PKTAP == p->type)
 277                                 return p->f;
 278         }
 279 #endif
 280
 281         return NULL;
 282         /* NOTREACHED */
 283 }
 284
 285 int
 286 has_printer(int type)
 287 {
 288         return (lookup_printer(type) != NULL);
 289 }
 290
 291 if_printer
 292 get_if_printer(netdissect_options *ndo, int type)
 293 {
 294         const char *dltname;
 295         if_printer printer;
 296
 297         printer = lookup_printer(type);
 298         if (printer == NULL) {
 299                 dltname = pcap_datalink_val_to_name(type);
 300                 if (dltname != NULL)
 301                         (*ndo->ndo_error)(ndo,
 302                                           "packet printing is not supported for link type %s: use -w",
 303                                           dltname);
 304                 else
 305                         (*ndo->ndo_error)(ndo,
 306                                           "packet printing is not supported for link type %d: use -w", type);
 307         }
 308         return printer;
 309 }
 310
 311 void
 312 pretty_print_packet(netdissect_options *ndo, const struct pcap_pkthdr *h,
 313                     const u_char *sp, u_int packets_captured)
 314 {
 315         u_int hdrlen;
 316         int invalid_header = 0;
 317
 318         if(ndo->ndo_packet_number)
 319                 ND_PRINT("%5u  ", packets_captured);
 320
 321         /* Sanity checks on packet length / capture length */
 322         if(h->caplen == 0) {
 323                 invalid_header = 1;
 324                 ND_PRINT("[Invalid header: caplen==0");
 325         }
 326         if (h->len == 0) {
 327                 if (!invalid_header) {
 328                         invalid_header = 1;
 329                         ND_PRINT("[Invalid header:");
 330                 } else
 331                         ND_PRINT(",");
 332                 ND_PRINT(" len==0");
 333         } else if (h->len < h->caplen) {
 334                 if (!invalid_header) {
 335                         invalid_header = 1;
 336                         ND_PRINT("[Invalid header:");
 337                 } else
 338                         ND_PRINT(",");
 339                 ND_PRINT(" len(%u) < caplen(%u)", h->len, h->caplen);
 340         }
 341         if (h->caplen > MAXIMUM_SNAPLEN) {
 342                 if (!invalid_header) {
 343                         invalid_header = 1;
 344                         ND_PRINT("[Invalid header:");
 345                 } else
 346                         ND_PRINT(",");
 347                 ND_PRINT(" caplen(%u) > %u", h->caplen, MAXIMUM_SNAPLEN);
 348         }
 349         if (invalid_header) {
 350                 ND_PRINT("]\n");
 351                 return;
 352         }
 353
 354         /*
 355          * At this point:
 356          *   capture length != 0,
 357          *   packet length != 0,
 358          *   capture length <= MAXIMUM_SNAPLEN,
 359          *   packet length >= capture length.
 360          */
 361
 362         ts_print(ndo, &h->ts);
 363
 364         /*
 365          * Printers must check that they're not walking off the end of
 366          * the packet.
 367          * Rather than pass it all the way down, we set this member
 368          * of the netdissect_options structure.
 369          */
 370         ndo->ndo_snapend = sp + h->caplen;
 371
 372         hdrlen = (ndo->ndo_if_printer)(ndo, h, sp);
 373
 374         /*
 375          * Restore the original snapend, as a printer might have
 376          * changed it.
 377          */
 378         ndo->ndo_snapend = sp + h->caplen;
 379         if (ndo->ndo_Xflag) {
 380                 /*
 381                  * Print the raw packet data in hex and ASCII.
 382                  */
 383                 if (ndo->ndo_Xflag > 1) {
 384                         /*
 385                          * Include the link-layer header.
 386                          */
 387                         hex_and_ascii_print(ndo, "\n\t", sp, h->caplen);
 388                 } else {
 389                         /*
 390                          * Don't include the link-layer header - and if
 391                          * we have nothing past the link-layer header,
 392                          * print nothing.
 393                          */
 394                         if (h->caplen > hdrlen)
 395                                 hex_and_ascii_print(ndo, "\n\t", sp + hdrlen,
 396                                                     h->caplen - hdrlen);
 397                 }
 398         } else if (ndo->ndo_xflag) {
 399                 /*
 400                  * Print the raw packet data in hex.
 401                  */
 402                 if (ndo->ndo_xflag > 1) {
 403                         /*
 404                          * Include the link-layer header.
 405                          */
 406                         hex_print(ndo, "\n\t", sp, h->caplen);
 407                 } else {
 408                         /*
 409                          * Don't include the link-layer header - and if
 410                          * we have nothing past the link-layer header,
 411                          * print nothing.
 412                          */
 413                         if (h->caplen > hdrlen)
 414                                 hex_print(ndo, "\n\t", sp + hdrlen,
 415                                           h->caplen - hdrlen);
 416                 }
 417         } else if (ndo->ndo_Aflag) {
 418                 /*
 419                  * Print the raw packet data in ASCII.
 420                  */
 421                 if (ndo->ndo_Aflag > 1) {
 422                         /*
 423                          * Include the link-layer header.
 424                          */
 425                         ascii_print(ndo, sp, h->caplen);
 426                 } else {
 427                         /*
 428                          * Don't include the link-layer header - and if
 429                          * we have nothing past the link-layer header,
 430                          * print nothing.
 431                          */
 432                         if (h->caplen > hdrlen)
 433                                 ascii_print(ndo, sp + hdrlen, h->caplen - hdrlen);
 434                 }
 435         }
 436
 437         ND_PRINT("\n");
 438 }
 439
 440 /*
 441  * By default, print the specified data out in hex and ASCII.
 442  */
 443 static void
 444 ndo_default_print(netdissect_options *ndo, const u_char *bp, u_int length)
 445 {
 446         hex_and_ascii_print(ndo, "\n\t", bp, length); /* pass on lf and indentation string */
 447 }
 448
 449 /* VARARGS */
 450 static void
 451 ndo_error(netdissect_options *ndo, const char *fmt, ...)
 452 {
 453         va_list ap;
 454
 455         if(ndo->program_name)
 456                 (void)fprintf(stderr, "%s: ", ndo->program_name);
 457         va_start(ap, fmt);
 458         (void)vfprintf(stderr, fmt, ap);
 459         va_end(ap);
 460         if (*fmt) {
 461                 fmt += strlen(fmt);
 462                 if (fmt[-1] != '\n')
 463                         (void)fputc('\n', stderr);
 464         }
 465         nd_cleanup();
 466         exit(1);
 467         /* NOTREACHED */
 468 }
 469
 470 /* VARARGS */
 471 static void
 472 ndo_warning(netdissect_options *ndo, const char *fmt, ...)
 473 {
 474         va_list ap;
 475
 476         if(ndo->program_name)
 477                 (void)fprintf(stderr, "%s: ", ndo->program_name);
 478         (void)fprintf(stderr, "WARNING: ");
 479         va_start(ap, fmt);
 480         (void)vfprintf(stderr, fmt, ap);
 481         va_end(ap);
 482         if (*fmt) {
 483                 fmt += strlen(fmt);
 484                 if (fmt[-1] != '\n')
 485                         (void)fputc('\n', stderr);
 486         }
 487 }
 488
 489 static int
 490 ndo_printf(netdissect_options *ndo, const char *fmt, ...)
 491 {
 492         va_list args;
 493         int ret;
 494
 495         va_start(args, fmt);
 496         ret = vfprintf(stdout, fmt, args);
 497         va_end(args);
 498
 499         if (ret < 0)
 500                 ndo_error(ndo, "Unable to write output: %s", pcap_strerror(errno));
 501         return (ret);
 502 }
 503
 504 void
 505 ndo_set_function_pointers(netdissect_options *ndo)
 506 {
 507         ndo->ndo_default_print=ndo_default_print;
 508         ndo->ndo_printf=ndo_printf;
 509         ndo->ndo_error=ndo_error;
 510         ndo->ndo_warning=ndo_warning;
 511 }
 512 /*
 513  * Local Variables:
 514  * c-style: whitesmith
 515  * c-basic-offset: 8
 516  * End:
 517  */