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 #ifdef DLT_APPLE_IP_OVER_IEEE1394
  52         { ap1394_if_print,      DLT_APPLE_IP_OVER_IEEE1394 },
  53 #endif
  54         { arcnet_if_print,      DLT_ARCNET },
  55 #ifdef DLT_ARCNET_LINUX
  56         { arcnet_linux_if_print, DLT_ARCNET_LINUX },
  57 #endif
  58         { atm_if_print,         DLT_ATM_RFC1483 },
  59 #ifdef DLT_DSA_TAG_BRCM
  60         { brcm_tag_if_print,    DLT_DSA_TAG_BRCM },
  61 #endif
  62 #ifdef DLT_DSA_TAG_BRCM_PREPEND
  63         { brcm_tag_prepend_if_print, DLT_DSA_TAG_BRCM_PREPEND },
  64 #endif
  65 #ifdef DLT_BLUETOOTH_HCI_H4_WITH_PHDR
  66         { bt_if_print,          DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
  67 #endif
  68 #ifdef DLT_C_HDLC
  69         { chdlc_if_print,       DLT_C_HDLC },
  70 #endif
  71 #ifdef DLT_HDLC
  72         { chdlc_if_print,       DLT_HDLC },
  73 #endif
  74 #ifdef DLT_ATM_CLIP
  75         { cip_if_print,         DLT_ATM_CLIP },
  76 #endif
  77 #ifdef DLT_CIP
  78         { cip_if_print,         DLT_CIP },
  79 #endif
  80 #ifdef DLT_DSA_TAG_DSA
  81         { dsa_if_print,         DLT_DSA_TAG_DSA },
  82 #endif
  83 #ifdef DLT_DSA_TAG_EDSA
  84         { edsa_if_print,        DLT_DSA_TAG_EDSA },
  85 #endif
  86 #ifdef DLT_ENC
  87         { enc_if_print,         DLT_ENC },
  88 #endif
  89         { ether_if_print,       DLT_EN10MB },
  90         { fddi_if_print,        DLT_FDDI },
  91 #ifdef DLT_FR
  92         { fr_if_print,          DLT_FR },
  93 #endif
  94 #ifdef DLT_FRELAY
  95         { fr_if_print,          DLT_FRELAY },
  96 #endif
  97 #ifdef DLT_IEEE802_11
  98         { ieee802_11_if_print,  DLT_IEEE802_11},
  99 #endif
 100 #ifdef DLT_IEEE802_11_RADIO_AVS
 101         { ieee802_11_radio_avs_if_print, DLT_IEEE802_11_RADIO_AVS },
 102 #endif
 103 #ifdef DLT_IEEE802_11_RADIO
 104         { ieee802_11_radio_if_print,    DLT_IEEE802_11_RADIO },
 105 #endif
 106 #ifdef DLT_IEEE802_15_4
 107         { ieee802_15_4_if_print, DLT_IEEE802_15_4 },
 108 #endif
 109 #ifdef DLT_IEEE802_15_4_NOFCS
 110         { ieee802_15_4_if_print, DLT_IEEE802_15_4_NOFCS },
 111 #endif
 112 #ifdef DLT_IEEE802_15_4_TAP
 113         { ieee802_15_4_tap_if_print, DLT_IEEE802_15_4_TAP },
 114 #endif
 115 #ifdef DLT_IP_OVER_FC
 116         { ipfc_if_print,        DLT_IP_OVER_FC },
 117 #endif
 118 #ifdef DLT_IPNET
 119         { ipnet_if_print,       DLT_IPNET },
 120 #endif
 121 #ifdef DLT_IPOIB
 122         { ipoib_if_print,       DLT_IPOIB },
 123 #endif
 124 #ifdef DLT_JUNIPER_ATM1
 125         { juniper_atm1_if_print, DLT_JUNIPER_ATM1 },
 126 #endif
 127 #ifdef DLT_JUNIPER_ATM2
 128         { juniper_atm2_if_print, DLT_JUNIPER_ATM2 },
 129 #endif
 130 #ifdef DLT_JUNIPER_CHDLC
 131         { juniper_chdlc_if_print,       DLT_JUNIPER_CHDLC },
 132 #endif
 133 #ifdef DLT_JUNIPER_ES
 134         { juniper_es_if_print,  DLT_JUNIPER_ES },
 135 #endif
 136 #ifdef DLT_JUNIPER_ETHER
 137         { juniper_ether_if_print,       DLT_JUNIPER_ETHER },
 138 #endif
 139 #ifdef DLT_JUNIPER_FRELAY
 140         { juniper_frelay_if_print,      DLT_JUNIPER_FRELAY },
 141 #endif
 142 #ifdef DLT_JUNIPER_GGSN
 143         { juniper_ggsn_if_print, DLT_JUNIPER_GGSN },
 144 #endif
 145 #ifdef DLT_JUNIPER_MFR
 146         { juniper_mfr_if_print, DLT_JUNIPER_MFR },
 147 #endif
 148 #ifdef DLT_JUNIPER_MLFR
 149         { juniper_mlfr_if_print, DLT_JUNIPER_MLFR },
 150 #endif
 151 #ifdef DLT_JUNIPER_MLPPP
 152         { juniper_mlppp_if_print, DLT_JUNIPER_MLPPP },
 153 #endif
 154 #ifdef DLT_JUNIPER_MONITOR
 155         { juniper_monitor_if_print, DLT_JUNIPER_MONITOR },
 156 #endif
 157 #ifdef DLT_JUNIPER_PPP
 158         { juniper_ppp_if_print, DLT_JUNIPER_PPP },
 159 #endif
 160 #ifdef DLT_JUNIPER_PPPOE_ATM
 161         { juniper_pppoe_atm_if_print, DLT_JUNIPER_PPPOE_ATM },
 162 #endif
 163 #ifdef DLT_JUNIPER_PPPOE
 164         { juniper_pppoe_if_print, DLT_JUNIPER_PPPOE },
 165 #endif
 166 #ifdef DLT_JUNIPER_SERVICES
 167         { juniper_services_if_print, DLT_JUNIPER_SERVICES },
 168 #endif
 169 #ifdef DLT_LTALK
 170         { ltalk_if_print,       DLT_LTALK },
 171 #endif
 172 #ifdef DLT_MFR
 173         { mfr_if_print,         DLT_MFR },
 174 #endif
 175 #ifdef DLT_NETANALYZER
 176         { netanalyzer_if_print, DLT_NETANALYZER },
 177 #endif
 178 #ifdef DLT_NETANALYZER_TRANSPARENT
 179         { netanalyzer_transparent_if_print, DLT_NETANALYZER_TRANSPARENT },
 180 #endif
 181 #ifdef DLT_NFLOG
 182         { nflog_if_print,       DLT_NFLOG},
 183 #endif
 184         { null_if_print,        DLT_NULL },
 185 #ifdef DLT_LOOP
 186         { null_if_print,        DLT_LOOP },
 187 #endif
 188 #if defined(DLT_PFLOG) && defined(HAVE_NET_IF_PFLOG_H)
 189         { pflog_if_print,       DLT_PFLOG },
 190 #endif
 191 #ifdef DLT_PKTAP
 192         { pktap_if_print,       DLT_PKTAP },
 193 #endif
 194 #ifdef DLT_PPI
 195         { ppi_if_print,         DLT_PPI },
 196 #endif
 197 #ifdef DLT_PPP_BSDOS
 198         { ppp_bsdos_if_print,   DLT_PPP_BSDOS },
 199 #endif
 200 #ifdef DLT_PPP_SERIAL
 201         { ppp_hdlc_if_print,    DLT_PPP_SERIAL },
 202 #endif
 203         { ppp_if_print,         DLT_PPP },
 204 #ifdef DLT_PPP_PPPD
 205         { ppp_if_print,         DLT_PPP_PPPD },
 206 #endif
 207 #ifdef DLT_PPP_ETHER
 208         { pppoe_if_print,       DLT_PPP_ETHER },
 209 #endif
 210 #ifdef DLT_PRISM_HEADER
 211         { prism_if_print,       DLT_PRISM_HEADER },
 212 #endif
 213         { raw_if_print,         DLT_RAW },
 214 #ifdef DLT_IPV4
 215         { raw_if_print,         DLT_IPV4 },
 216 #endif
 217 #ifdef DLT_IPV6
 218         { raw_if_print,         DLT_IPV6 },
 219 #endif
 220 #ifdef DLT_SLIP_BSDOS
 221         { sl_bsdos_if_print,    DLT_SLIP_BSDOS },
 222 #endif
 223         { sl_if_print,          DLT_SLIP },
 224 #ifdef DLT_LINUX_SLL
 225         { sll_if_print,         DLT_LINUX_SLL },
 226 #endif
 227 #ifdef DLT_LINUX_SLL2
 228         { sll2_if_print,        DLT_LINUX_SLL2 },
 229 #endif
 230 #ifdef DLT_SUNATM
 231         { sunatm_if_print,      DLT_SUNATM },
 232 #endif
 233 #ifdef DLT_SYMANTEC_FIREWALL
 234         { symantec_if_print,    DLT_SYMANTEC_FIREWALL },
 235 #endif
 236         { token_if_print,       DLT_IEEE802 },
 237 #ifdef DLT_USB_LINUX
 238         { usb_linux_48_byte_if_print, DLT_USB_LINUX},
 239 #endif /* DLT_USB_LINUX */
 240 #ifdef DLT_USB_LINUX_MMAPPED
 241         { usb_linux_64_byte_if_print, DLT_USB_LINUX_MMAPPED},
 242 #endif /* DLT_USB_LINUX_MMAPPED */
 243 #ifdef DLT_VSOCK
 244         { vsock_if_print,       DLT_VSOCK },
 245 #endif
 246         { NULL,                 0 },
 247 };
 248
 249 void
 250 init_print(netdissect_options *ndo, uint32_t localnet, uint32_t mask)
 251 {
 252
 253         init_addrtoname(ndo, localnet, mask);
 254         init_checksum();
 255 }
 256
 257 if_printer
 258 lookup_printer(int type)
 259 {
 260         const struct printer *p;
 261
 262         for (p = printers; p->f; ++p)
 263                 if (type == p->type)
 264                         return p->f;
 265
 266 #if defined(DLT_USER2) && defined(DLT_PKTAP)
 267         /*
 268          * Apple incorrectly chose to use DLT_USER2 for their PKTAP
 269          * header.
 270          *
 271          * We map DLT_PKTAP, whether it's DLT_USER2 as it is on Darwin-
 272          * based OSes or the same value as LINKTYPE_PKTAP as it is on
 273          * other OSes, to LINKTYPE_PKTAP, so files written with
 274          * this version of libpcap for a DLT_PKTAP capture have a link-
 275          * layer header type of LINKTYPE_PKTAP.
 276          *
 277          * However, files written on OS X Mavericks for a DLT_PKTAP
 278          * capture have a link-layer header type of LINKTYPE_USER2.
 279          * If we don't have a printer for DLT_USER2, and type is
 280          * DLT_USER2, we look up the printer for DLT_PKTAP and use
 281          * that.
 282          */
 283         if (type == DLT_USER2) {
 284                 for (p = printers; p->f; ++p)
 285                         if (DLT_PKTAP == p->type)
 286                                 return p->f;
 287         }
 288 #endif
 289
 290         return NULL;
 291         /* NOTREACHED */
 292 }
 293
 294 int
 295 has_printer(int type)
 296 {
 297         return (lookup_printer(type) != NULL);
 298 }
 299
 300 if_printer
 301 get_if_printer(int type)
 302 {
 303         if_printer printer;
 304
 305         printer = lookup_printer(type);
 306         if (printer == NULL)
 307                 printer = unsupported_if_print;
 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 = 0;
 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 (h->len > MAXIMUM_SNAPLEN) {
 350                 if (!invalid_header) {
 351                         invalid_header = 1;
 352                         ND_PRINT("[Invalid header:");
 353                 } else
 354                         ND_PRINT(",");
 355                 ND_PRINT(" len(%u) > %u", h->len, MAXIMUM_SNAPLEN);
 356         }
 357         if (invalid_header) {
 358                 ND_PRINT("]\n");
 359                 return;
 360         }
 361
 362         /*
 363          * At this point:
 364          *   capture length != 0,
 365          *   packet length != 0,
 366          *   capture length <= MAXIMUM_SNAPLEN,
 367          *   packet length <= MAXIMUM_SNAPLEN,
 368          *   packet length >= capture length.
 369          *
 370          * Currently, there is no D-Bus printer, thus no need for
 371          * bigger lengths.
 372          */
 373
 374         /*
 375          * The header /usr/include/pcap/pcap.h in OpenBSD declares h->ts as
 376          * struct bpf_timeval, not struct timeval. The former comes from
 377          * /usr/include/net/bpf.h and uses 32-bit unsigned types instead of
 378          * the types used in struct timeval.
 379          */
 380         struct timeval tvbuf;
 381         tvbuf.tv_sec = h->ts.tv_sec;
 382         tvbuf.tv_usec = h->ts.tv_usec;
 383         ts_print(ndo, &tvbuf);
 384
 385         /*
 386          * Printers must check that they're not walking off the end of
 387          * the packet.
 388          * Rather than pass it all the way down, we set this member
 389          * of the netdissect_options structure.
 390          */
 391         ndo->ndo_snapend = sp + h->caplen;
 392
 393         ndo->ndo_protocol = "";
 394         ndo->ndo_ll_hdr_len = 0;
 395         switch (setjmp(ndo->ndo_early_end)) {
 396         case 0:
 397                 /* Print the packet. */
 398                 (ndo->ndo_if_printer)(ndo, h, sp);
 399                 break;
 400         case ND_TRUNCATED:
 401                 /* A printer quit because the packet was truncated; report it */
 402                 nd_print_trunc(ndo);
 403                 /* Print the full packet */
 404                 ndo->ndo_ll_hdr_len = 0;
 405                 break;
 406         }
 407         hdrlen = ndo->ndo_ll_hdr_len;
 408
 409         /*
 410          * Empty the stack of packet information, freeing all pushed buffers;
 411          * if we got here by a printer quitting, we need to release anything
 412          * that didn't get released because we longjmped out of the code
 413          * before it popped the packet information.
 414          */
 415         nd_pop_all_packet_info(ndo);
 416
 417         /*
 418          * Restore the original snapend, as a printer might have
 419          * changed it.
 420          */
 421         ndo->ndo_snapend = sp + h->caplen;
 422         if (ndo->ndo_Xflag) {
 423                 /*
 424                  * Print the raw packet data in hex and ASCII.
 425                  */
 426                 if (ndo->ndo_Xflag > 1) {
 427                         /*
 428                          * Include the link-layer header.
 429                          */
 430                         hex_and_ascii_print(ndo, "\n\t", sp, h->caplen);
 431                 } else {
 432                         /*
 433                          * Don't include the link-layer header - and if
 434                          * we have nothing past the link-layer header,
 435                          * print nothing.
 436                          */
 437                         if (h->caplen > hdrlen)
 438                                 hex_and_ascii_print(ndo, "\n\t", sp + hdrlen,
 439                                                     h->caplen - hdrlen);
 440                 }
 441         } else if (ndo->ndo_xflag) {
 442                 /*
 443                  * Print the raw packet data in hex.
 444                  */
 445                 if (ndo->ndo_xflag > 1) {
 446                         /*
 447                          * Include the link-layer header.
 448                          */
 449                         hex_print(ndo, "\n\t", sp, h->caplen);
 450                 } else {
 451                         /*
 452                          * Don't include the link-layer header - and if
 453                          * we have nothing past the link-layer header,
 454                          * print nothing.
 455                          */
 456                         if (h->caplen > hdrlen)
 457                                 hex_print(ndo, "\n\t", sp + hdrlen,
 458                                           h->caplen - hdrlen);
 459                 }
 460         } else if (ndo->ndo_Aflag) {
 461                 /*
 462                  * Print the raw packet data in ASCII.
 463                  */
 464                 if (ndo->ndo_Aflag > 1) {
 465                         /*
 466                          * Include the link-layer header.
 467                          */
 468                         ascii_print(ndo, sp, h->caplen);
 469                 } else {
 470                         /*
 471                          * Don't include the link-layer header - and if
 472                          * we have nothing past the link-layer header,
 473                          * print nothing.
 474                          */
 475                         if (h->caplen > hdrlen)
 476                                 ascii_print(ndo, sp + hdrlen, h->caplen - hdrlen);
 477                 }
 478         }
 479
 480         ND_PRINT("\n");
 481         nd_free_all(ndo);
 482 }
 483
 484 /*
 485  * By default, print the specified data out in hex and ASCII.
 486  */
 487 static void
 488 ndo_default_print(netdissect_options *ndo, const u_char *bp, u_int length)
 489 {
 490         hex_and_ascii_print(ndo, "\n\t", bp, length); /* pass on lf and indentation string */
 491 }
 492
 493 /* VARARGS */
 494 static void NORETURN PRINTFLIKE(3, 4)
 495 ndo_error(netdissect_options *ndo, status_exit_codes_t status,
 496           FORMAT_STRING(const char *fmt), ...)
 497 {
 498         va_list ap;
 499
 500         if (ndo->program_name)
 501                 (void)fprintf(stderr, "%s: ", ndo->program_name);
 502         va_start(ap, fmt);
 503         (void)vfprintf(stderr, fmt, ap);
 504         va_end(ap);
 505         if (*fmt) {
 506                 fmt += strlen(fmt);
 507                 if (fmt[-1] != '\n')
 508                         (void)fputc('\n', stderr);
 509         }
 510         nd_cleanup();
 511         exit(status);
 512         /* NOTREACHED */
 513 }
 514
 515 /* VARARGS */
 516 static void PRINTFLIKE(2, 3)
 517 ndo_warning(netdissect_options *ndo, FORMAT_STRING(const char *fmt), ...)
 518 {
 519         va_list ap;
 520
 521         if (ndo->program_name)
 522                 (void)fprintf(stderr, "%s: ", ndo->program_name);
 523         (void)fprintf(stderr, "WARNING: ");
 524         va_start(ap, fmt);
 525         (void)vfprintf(stderr, fmt, ap);
 526         va_end(ap);
 527         if (*fmt) {
 528                 fmt += strlen(fmt);
 529                 if (fmt[-1] != '\n')
 530                         (void)fputc('\n', stderr);
 531         }
 532 }
 533
 534 /* VARARGS */
 535 static int PRINTFLIKE(2, 3)
 536 ndo_printf(netdissect_options *ndo, FORMAT_STRING(const char *fmt), ...)
 537 {
 538         va_list args;
 539         int ret;
 540
 541         va_start(args, fmt);
 542         ret = vfprintf(stdout, fmt, args);
 543         va_end(args);
 544
 545         if (ret < 0)
 546                 ndo_error(ndo, S_ERR_ND_WRITE_FILE,
 547                           "Unable to write output: %s", pcap_strerror(errno));
 548         return (ret);
 549 }
 550
 551 void
 552 ndo_set_function_pointers(netdissect_options *ndo)
 553 {
 554         ndo->ndo_default_print=ndo_default_print;
 555         ndo->ndo_printf=ndo_printf;
 556         ndo->ndo_error=ndo_error;
 557         ndo->ndo_warning=ndo_warning;
 558 }