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 #include <config.h>
  29
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <setjmp.h>
  33
  34 #include "netdissect-stdinc.h"
  35
  36 #include "netdissect.h"
  37 #include "addrtoname.h"
  38 #include "print.h"
  39 #include "netdissect-alloc.h"
  40
  41 #include "pcap-missing.h"
  42
  43 struct printer {
  44         if_printer f;
  45         int type;
  46 };
  47
  48 static const struct printer printers[] = {
  49 #ifdef DLT_APPLE_IP_OVER_IEEE1394
  50         { ap1394_if_print,      DLT_APPLE_IP_OVER_IEEE1394 },
  51 #endif
  52         { arcnet_if_print,      DLT_ARCNET },
  53 #ifdef DLT_ARCNET_LINUX
  54         { arcnet_linux_if_print, DLT_ARCNET_LINUX },
  55 #endif
  56         { atm_if_print,         DLT_ATM_RFC1483 },
  57 #ifdef DLT_DSA_TAG_BRCM
  58         { brcm_tag_if_print,    DLT_DSA_TAG_BRCM },
  59 #endif
  60 #ifdef DLT_DSA_TAG_BRCM_PREPEND
  61         { brcm_tag_prepend_if_print, DLT_DSA_TAG_BRCM_PREPEND },
  62 #endif
  63 #ifdef DLT_BLUETOOTH_HCI_H4_WITH_PHDR
  64         { bt_if_print,          DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
  65 #endif
  66 #ifdef DLT_C_HDLC
  67         { chdlc_if_print,       DLT_C_HDLC },
  68 #endif
  69 #ifdef DLT_HDLC
  70         { chdlc_if_print,       DLT_HDLC },
  71 #endif
  72 #ifdef DLT_ATM_CLIP
  73         { cip_if_print,         DLT_ATM_CLIP },
  74 #endif
  75 #ifdef DLT_CIP
  76         { cip_if_print,         DLT_CIP },
  77 #endif
  78 #ifdef DLT_DSA_TAG_DSA
  79         { dsa_if_print,         DLT_DSA_TAG_DSA },
  80 #endif
  81 #ifdef DLT_DSA_TAG_EDSA
  82         { edsa_if_print,        DLT_DSA_TAG_EDSA },
  83 #endif
  84 #ifdef DLT_ENC
  85         { enc_if_print,         DLT_ENC },
  86 #endif
  87         { ether_if_print,       DLT_EN10MB },
  88         { fddi_if_print,        DLT_FDDI },
  89 #ifdef DLT_FR
  90         { fr_if_print,          DLT_FR },
  91 #endif
  92 #ifdef DLT_FRELAY
  93         { fr_if_print,          DLT_FRELAY },
  94 #endif
  95 #ifdef DLT_IEEE802_11
  96         { ieee802_11_if_print,  DLT_IEEE802_11},
  97 #endif
  98 #ifdef DLT_IEEE802_11_RADIO_AVS
  99         { ieee802_11_radio_avs_if_print, DLT_IEEE802_11_RADIO_AVS },
 100 #endif
 101 #ifdef DLT_IEEE802_11_RADIO
 102         { ieee802_11_radio_if_print,    DLT_IEEE802_11_RADIO },
 103 #endif
 104 #ifdef DLT_IEEE802_15_4
 105         { ieee802_15_4_if_print, DLT_IEEE802_15_4 },
 106 #endif
 107 #ifdef DLT_IEEE802_15_4_NOFCS
 108         { ieee802_15_4_if_print, DLT_IEEE802_15_4_NOFCS },
 109 #endif
 110 #ifdef DLT_IEEE802_15_4_TAP
 111         { ieee802_15_4_tap_if_print, DLT_IEEE802_15_4_TAP },
 112 #endif
 113 #ifdef DLT_IP_OVER_FC
 114         { ipfc_if_print,        DLT_IP_OVER_FC },
 115 #endif
 116 #ifdef DLT_IPNET
 117         { ipnet_if_print,       DLT_IPNET },
 118 #endif
 119 #ifdef DLT_IPOIB
 120         { ipoib_if_print,       DLT_IPOIB },
 121 #endif
 122 #ifdef DLT_JUNIPER_ATM1
 123         { juniper_atm1_if_print, DLT_JUNIPER_ATM1 },
 124 #endif
 125 #ifdef DLT_JUNIPER_ATM2
 126         { juniper_atm2_if_print, DLT_JUNIPER_ATM2 },
 127 #endif
 128 #ifdef DLT_JUNIPER_CHDLC
 129         { juniper_chdlc_if_print,       DLT_JUNIPER_CHDLC },
 130 #endif
 131 #ifdef DLT_JUNIPER_ES
 132         { juniper_es_if_print,  DLT_JUNIPER_ES },
 133 #endif
 134 #ifdef DLT_JUNIPER_ETHER
 135         { juniper_ether_if_print,       DLT_JUNIPER_ETHER },
 136 #endif
 137 #ifdef DLT_JUNIPER_FRELAY
 138         { juniper_frelay_if_print,      DLT_JUNIPER_FRELAY },
 139 #endif
 140 #ifdef DLT_JUNIPER_GGSN
 141         { juniper_ggsn_if_print, DLT_JUNIPER_GGSN },
 142 #endif
 143 #ifdef DLT_JUNIPER_MFR
 144         { juniper_mfr_if_print, DLT_JUNIPER_MFR },
 145 #endif
 146 #ifdef DLT_JUNIPER_MLFR
 147         { juniper_mlfr_if_print, DLT_JUNIPER_MLFR },
 148 #endif
 149 #ifdef DLT_JUNIPER_MLPPP
 150         { juniper_mlppp_if_print, DLT_JUNIPER_MLPPP },
 151 #endif
 152 #ifdef DLT_JUNIPER_MONITOR
 153         { juniper_monitor_if_print, DLT_JUNIPER_MONITOR },
 154 #endif
 155 #ifdef DLT_JUNIPER_PPP
 156         { juniper_ppp_if_print, DLT_JUNIPER_PPP },
 157 #endif
 158 #ifdef DLT_JUNIPER_PPPOE_ATM
 159         { juniper_pppoe_atm_if_print, DLT_JUNIPER_PPPOE_ATM },
 160 #endif
 161 #ifdef DLT_JUNIPER_PPPOE
 162         { juniper_pppoe_if_print, DLT_JUNIPER_PPPOE },
 163 #endif
 164 #ifdef DLT_JUNIPER_SERVICES
 165         { juniper_services_if_print, DLT_JUNIPER_SERVICES },
 166 #endif
 167 #ifdef DLT_LTALK
 168         { ltalk_if_print,       DLT_LTALK },
 169 #endif
 170 #ifdef DLT_MFR
 171         { mfr_if_print,         DLT_MFR },
 172 #endif
 173 #ifdef DLT_NETANALYZER
 174         { netanalyzer_if_print, DLT_NETANALYZER },
 175 #endif
 176 #ifdef DLT_NETANALYZER_TRANSPARENT
 177         { netanalyzer_transparent_if_print, DLT_NETANALYZER_TRANSPARENT },
 178 #endif
 179 #ifdef DLT_NFLOG
 180         { nflog_if_print,       DLT_NFLOG},
 181 #endif
 182         { null_if_print,        DLT_NULL },
 183 #ifdef DLT_LOOP
 184         { null_if_print,        DLT_LOOP },
 185 #endif
 186 #ifdef DLT_PFLOG
 187         { pflog_if_print,       DLT_PFLOG },
 188 #endif
 189 #ifdef DLT_PKTAP
 190         { pktap_if_print,       DLT_PKTAP },
 191 #endif
 192 #ifdef DLT_PPI
 193         { ppi_if_print,         DLT_PPI },
 194 #endif
 195 #ifdef DLT_PPP_SERIAL
 196         { ppp_hdlc_if_print,    DLT_PPP_SERIAL },
 197 #endif
 198         { ppp_if_print,         DLT_PPP },
 199 #ifdef DLT_PPP_PPPD
 200         { ppp_if_print,         DLT_PPP_PPPD },
 201 #endif
 202 #ifdef DLT_PPP_ETHER
 203         { pppoe_if_print,       DLT_PPP_ETHER },
 204 #endif
 205 #ifdef DLT_PRISM_HEADER
 206         { prism_if_print,       DLT_PRISM_HEADER },
 207 #endif
 208         { raw_if_print,         DLT_RAW },
 209 #ifdef DLT_IPV4
 210         { raw_if_print,         DLT_IPV4 },
 211 #endif
 212 #ifdef DLT_IPV6
 213         { raw_if_print,         DLT_IPV6 },
 214 #endif
 215 #ifdef DLT_SLIP_BSDOS
 216         { sl_bsdos_if_print,    DLT_SLIP_BSDOS },
 217 #endif
 218         { sl_if_print,          DLT_SLIP },
 219 #ifdef DLT_LINUX_SLL
 220         { sll_if_print,         DLT_LINUX_SLL },
 221 #endif
 222 #ifdef DLT_LINUX_SLL2
 223         { sll2_if_print,        DLT_LINUX_SLL2 },
 224 #endif
 225 #ifdef DLT_SUNATM
 226         { sunatm_if_print,      DLT_SUNATM },
 227 #endif
 228 #ifdef DLT_SYMANTEC_FIREWALL
 229         { symantec_if_print,    DLT_SYMANTEC_FIREWALL },
 230 #endif
 231         { token_if_print,       DLT_IEEE802 },
 232 #ifdef DLT_USB_LINUX
 233         { usb_linux_48_byte_if_print, DLT_USB_LINUX},
 234 #endif /* DLT_USB_LINUX */
 235 #ifdef DLT_USB_LINUX_MMAPPED
 236         { usb_linux_64_byte_if_print, DLT_USB_LINUX_MMAPPED},
 237 #endif /* DLT_USB_LINUX_MMAPPED */
 238 #ifdef DLT_VSOCK
 239         { vsock_if_print,       DLT_VSOCK },
 240 #endif
 241         { NULL,                 0 },
 242 };
 243
 244 void
 245 init_print(netdissect_options *ndo, uint32_t localnet, uint32_t mask)
 246 {
 247         init_addrtoname(ndo, localnet, mask);
 248 }
 249
 250 if_printer
 251 lookup_printer(int type)
 252 {
 253         const struct printer *p;
 254
 255         for (p = printers; p->f; ++p)
 256                 if (type == p->type)
 257                         return p->f;
 258
 259 #if defined(DLT_USER2) && defined(DLT_PKTAP)
 260         /*
 261          * Apple incorrectly chose to use DLT_USER2 for their PKTAP
 262          * header.
 263          *
 264          * We map DLT_PKTAP, whether it's DLT_USER2 as it is on Darwin-
 265          * based OSes or the same value as LINKTYPE_PKTAP as it is on
 266          * other OSes, to LINKTYPE_PKTAP, so files written with
 267          * this version of libpcap for a DLT_PKTAP capture have a link-
 268          * layer header type of LINKTYPE_PKTAP.
 269          *
 270          * However, files written on OS X Mavericks for a DLT_PKTAP
 271          * capture have a link-layer header type of LINKTYPE_USER2.
 272          * If we don't have a printer for DLT_USER2, and type is
 273          * DLT_USER2, we look up the printer for DLT_PKTAP and use
 274          * that.
 275          */
 276         if (type == DLT_USER2) {
 277                 for (p = printers; p->f; ++p)
 278                         if (DLT_PKTAP == p->type)
 279                                 return p->f;
 280         }
 281 #endif
 282
 283         return NULL;
 284         /* NOTREACHED */
 285 }
 286
 287 int
 288 has_printer(int type)
 289 {
 290         return (lookup_printer(type) != NULL);
 291 }
 292
 293 if_printer
 294 get_if_printer(int type)
 295 {
 296         if_printer printer;
 297
 298         printer = lookup_printer(type);
 299         if (printer == NULL)
 300                 printer = unsupported_if_print;
 301         return printer;
 302 }
 303
 304 #ifdef ENABLE_INSTRUMENT_FUNCTIONS
 305 extern int profile_func_level;
 306 static int pretty_print_packet_level = -1;
 307 #endif
 308
 309 void
 310 pretty_print_packet(netdissect_options *ndo, const struct pcap_pkthdr *h,
 311                     const u_char *sp, u_int packets_captured)
 312 {
 313         u_int hdrlen = 0;
 314         int invalid_header = 0;
 315
 316         if (ndo->ndo_print_sampling && packets_captured % ndo->ndo_print_sampling != 0)
 317                 return;
 318
 319 #ifdef ENABLE_INSTRUMENT_FUNCTIONS
 320         if (pretty_print_packet_level == -1)
 321                 pretty_print_packet_level = profile_func_level;
 322 #endif
 323
 324         if (ndo->ndo_packet_number)
 325                 ND_PRINT("%5u  ", packets_captured);
 326
 327         if (ndo->ndo_lengths)
 328                 ND_PRINT("caplen %u len %u ", h->caplen, h->len);
 329
 330         /* Sanity checks on packet length / capture length */
 331         if (h->caplen == 0) {
 332                 invalid_header = 1;
 333                 ND_PRINT("[Invalid header: caplen==0");
 334         }
 335         if (h->len == 0) {
 336                 if (!invalid_header) {
 337                         invalid_header = 1;
 338                         ND_PRINT("[Invalid header:");
 339                 } else
 340                         ND_PRINT(",");
 341                 ND_PRINT(" len==0");
 342         } else if (h->len < h->caplen) {
 343                 if (!invalid_header) {
 344                         invalid_header = 1;
 345                         ND_PRINT("[Invalid header:");
 346                 } else
 347                         ND_PRINT(",");
 348                 ND_PRINT(" len(%u) < caplen(%u)", h->len, h->caplen);
 349         }
 350         if (h->caplen > MAXIMUM_SNAPLEN) {
 351                 if (!invalid_header) {
 352                         invalid_header = 1;
 353                         ND_PRINT("[Invalid header:");
 354                 } else
 355                         ND_PRINT(",");
 356                 ND_PRINT(" caplen(%u) > %u", h->caplen, MAXIMUM_SNAPLEN);
 357         }
 358         if (h->len > MAXIMUM_SNAPLEN) {
 359                 if (!invalid_header) {
 360                         invalid_header = 1;
 361                         ND_PRINT("[Invalid header:");
 362                 } else
 363                         ND_PRINT(",");
 364                 ND_PRINT(" len(%u) > %u", h->len, MAXIMUM_SNAPLEN);
 365         }
 366         if (invalid_header) {
 367                 ND_PRINT("]\n");
 368                 return;
 369         }
 370
 371         /*
 372          * At this point:
 373          *   capture length != 0,
 374          *   packet length != 0,
 375          *   capture length <= MAXIMUM_SNAPLEN,
 376          *   packet length <= MAXIMUM_SNAPLEN,
 377          *   packet length >= capture length.
 378          *
 379          * Currently, there is no D-Bus printer, thus no need for
 380          * bigger lengths.
 381          */
 382
 383         /*
 384          * The header /usr/include/pcap/pcap.h in OpenBSD declares h->ts as
 385          * struct bpf_timeval, not struct timeval. The former comes from
 386          * /usr/include/net/bpf.h and uses 32-bit unsigned types instead of
 387          * the types used in struct timeval.
 388          */
 389         struct timeval tvbuf;
 390         tvbuf.tv_sec = h->ts.tv_sec;
 391         tvbuf.tv_usec = h->ts.tv_usec;
 392         ts_print(ndo, &tvbuf);
 393
 394         /*
 395          * Printers must check that they're not walking off the end of
 396          * the packet.
 397          * Rather than pass it all the way down, we set this member
 398          * of the netdissect_options structure.
 399          */
 400         ndo->ndo_snapend = sp + h->caplen;
 401         ndo->ndo_packetp = sp;
 402
 403         ndo->ndo_protocol = "";
 404         ndo->ndo_ll_hdr_len = 0;
 405         switch (setjmp(ndo->ndo_early_end)) {
 406         case 0:
 407                 /* Print the packet. */
 408                 (ndo->ndo_if_printer)(ndo, h, sp);
 409                 break;
 410         case ND_TRUNCATED:
 411                 /* A printer quit because the packet was truncated; report it */
 412                 nd_print_trunc(ndo);
 413                 /* Print the full packet */
 414                 ndo->ndo_ll_hdr_len = 0;
 415 #ifdef ENABLE_INSTRUMENT_FUNCTIONS
 416                 /* truncation => reassignment */
 417                 profile_func_level = pretty_print_packet_level;
 418 #endif
 419                 break;
 420         }
 421         hdrlen = ndo->ndo_ll_hdr_len;
 422
 423         /*
 424          * Empty the stack of packet information, freeing all pushed buffers;
 425          * if we got here by a printer quitting, we need to release anything
 426          * that didn't get released because we longjmped out of the code
 427          * before it popped the packet information.
 428          */
 429         nd_pop_all_packet_info(ndo);
 430
 431         /*
 432          * Restore the originals snapend and packetp, as a printer
 433          * might have changed them.
 434          *
 435          * XXX - nd_pop_all_packet_info() should have restored the
 436          * original values, but, just in case....
 437          */
 438         ndo->ndo_snapend = sp + h->caplen;
 439         ndo->ndo_packetp = sp;
 440         if (ndo->ndo_Xflag) {
 441                 /*
 442                  * Print the raw packet data in hex and ASCII.
 443                  */
 444                 if (ndo->ndo_Xflag > 1) {
 445                         /*
 446                          * Include the link-layer header.
 447                          */
 448                         hex_and_ascii_print(ndo, "\n\t", 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                                 hex_and_ascii_print(ndo, "\n\t", sp + hdrlen,
 457                                                     h->caplen - hdrlen);
 458                 }
 459         } else if (ndo->ndo_xflag) {
 460                 /*
 461                  * Print the raw packet data in hex.
 462                  */
 463                 if (ndo->ndo_xflag > 1) {
 464                         /*
 465                          * Include the link-layer header.
 466                          */
 467                         hex_print(ndo, "\n\t", sp, h->caplen);
 468                 } else {
 469                         /*
 470                          * Don't include the link-layer header - and if
 471                          * we have nothing past the link-layer header,
 472                          * print nothing.
 473                          */
 474                         if (h->caplen > hdrlen)
 475                                 hex_print(ndo, "\n\t", sp + hdrlen,
 476                                           h->caplen - hdrlen);
 477                 }
 478         } else if (ndo->ndo_Aflag) {
 479                 /*
 480                  * Print the raw packet data in ASCII.
 481                  */
 482                 if (ndo->ndo_Aflag > 1) {
 483                         /*
 484                          * Include the link-layer header.
 485                          */
 486                         ascii_print(ndo, sp, h->caplen);
 487                 } else {
 488                         /*
 489                          * Don't include the link-layer header - and if
 490                          * we have nothing past the link-layer header,
 491                          * print nothing.
 492                          */
 493                         if (h->caplen > hdrlen)
 494                                 ascii_print(ndo, sp + hdrlen, h->caplen - hdrlen);
 495                 }
 496         }
 497
 498         ND_PRINT("\n");
 499         nd_free_all(ndo);
 500 }
 501
 502 /*
 503  * By default, print the specified data out in hex and ASCII.
 504  */
 505 static void
 506 ndo_default_print(netdissect_options *ndo, const u_char *bp, u_int length)
 507 {
 508         hex_and_ascii_print(ndo, "\n\t", bp, length); /* pass on lf and indentation string */
 509 }
 510
 511 /* VARARGS */
 512 static void NORETURN PRINTFLIKE(3, 4)
 513 ndo_error(netdissect_options *ndo, status_exit_codes_t status,
 514           FORMAT_STRING(const char *fmt), ...)
 515 {
 516         va_list ap;
 517
 518         if (ndo->program_name)
 519                 (void)fprintf(stderr, "%s: ", ndo->program_name);
 520         va_start(ap, fmt);
 521         (void)vfprintf(stderr, fmt, ap);
 522         va_end(ap);
 523         if (*fmt) {
 524                 fmt += strlen(fmt);
 525                 if (fmt[-1] != '\n')
 526                         (void)fputc('\n', stderr);
 527         }
 528         nd_cleanup();
 529         exit(status);
 530         /* NOTREACHED */
 531 }
 532
 533 /* VARARGS */
 534 static void PRINTFLIKE(2, 3)
 535 ndo_warning(netdissect_options *ndo, FORMAT_STRING(const char *fmt), ...)
 536 {
 537         va_list ap;
 538
 539         if (ndo->program_name)
 540                 (void)fprintf(stderr, "%s: ", ndo->program_name);
 541         (void)fprintf(stderr, "WARNING: ");
 542         va_start(ap, fmt);
 543         (void)vfprintf(stderr, fmt, ap);
 544         va_end(ap);
 545         if (*fmt) {
 546                 fmt += strlen(fmt);
 547                 if (fmt[-1] != '\n')
 548                         (void)fputc('\n', stderr);
 549         }
 550 }
 551
 552 /* VARARGS */
 553 static int PRINTFLIKE(2, 3)
 554 ndo_printf(netdissect_options *ndo, FORMAT_STRING(const char *fmt), ...)
 555 {
 556         va_list args;
 557         int ret;
 558
 559         va_start(args, fmt);
 560         ret = vfprintf(stdout, fmt, args);
 561         va_end(args);
 562
 563         if (ret < 0)
 564                 ndo_error(ndo, S_ERR_ND_WRITE_FILE,
 565                           "Unable to write output: %s", pcap_strerror(errno));
 566         return (ret);
 567 }
 568
 569 void
 570 ndo_set_function_pointers(netdissect_options *ndo)
 571 {
 572         ndo->ndo_default_print=ndo_default_print;
 573         ndo->ndo_printf=ndo_printf;
 574         ndo->ndo_error=ndo_error;
 575         ndo->ndo_warning=ndo_warning;
 576 }