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 #ifdef DLT_PFLOG
 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_SERIAL
 198         { ppp_hdlc_if_print,    DLT_PPP_SERIAL },
 199 #endif
 200         { ppp_if_print,         DLT_PPP },
 201 #ifdef DLT_PPP_PPPD
 202         { ppp_if_print,         DLT_PPP_PPPD },
 203 #endif
 204 #ifdef DLT_PPP_ETHER
 205         { pppoe_if_print,       DLT_PPP_ETHER },
 206 #endif
 207 #ifdef DLT_PRISM_HEADER
 208         { prism_if_print,       DLT_PRISM_HEADER },
 209 #endif
 210         { raw_if_print,         DLT_RAW },
 211 #ifdef DLT_IPV4
 212         { raw_if_print,         DLT_IPV4 },
 213 #endif
 214 #ifdef DLT_IPV6
 215         { raw_if_print,         DLT_IPV6 },
 216 #endif
 217 #ifdef DLT_SLIP_BSDOS
 218         { sl_bsdos_if_print,    DLT_SLIP_BSDOS },
 219 #endif
 220         { sl_if_print,          DLT_SLIP },
 221 #ifdef DLT_LINUX_SLL
 222         { sll_if_print,         DLT_LINUX_SLL },
 223 #endif
 224 #ifdef DLT_LINUX_SLL2
 225         { sll2_if_print,        DLT_LINUX_SLL2 },
 226 #endif
 227 #ifdef DLT_SUNATM
 228         { sunatm_if_print,      DLT_SUNATM },
 229 #endif
 230 #ifdef DLT_SYMANTEC_FIREWALL
 231         { symantec_if_print,    DLT_SYMANTEC_FIREWALL },
 232 #endif
 233         { token_if_print,       DLT_IEEE802 },
 234 #ifdef DLT_USB_LINUX
 235         { usb_linux_48_byte_if_print, DLT_USB_LINUX},
 236 #endif /* DLT_USB_LINUX */
 237 #ifdef DLT_USB_LINUX_MMAPPED
 238         { usb_linux_64_byte_if_print, DLT_USB_LINUX_MMAPPED},
 239 #endif /* DLT_USB_LINUX_MMAPPED */
 240 #ifdef DLT_VSOCK
 241         { vsock_if_print,       DLT_VSOCK },
 242 #endif
 243         { NULL,                 0 },
 244 };
 245
 246 void
 247 init_print(netdissect_options *ndo, uint32_t localnet, uint32_t mask)
 248 {
 249         init_addrtoname(ndo, localnet, mask);
 250 }
 251
 252 if_printer
 253 lookup_printer(int type)
 254 {
 255         const struct printer *p;
 256
 257         for (p = printers; p->f; ++p)
 258                 if (type == p->type)
 259                         return p->f;
 260
 261 #if defined(DLT_USER2) && defined(DLT_PKTAP)
 262         /*
 263          * Apple incorrectly chose to use DLT_USER2 for their PKTAP
 264          * header.
 265          *
 266          * We map DLT_PKTAP, whether it's DLT_USER2 as it is on Darwin-
 267          * based OSes or the same value as LINKTYPE_PKTAP as it is on
 268          * other OSes, to LINKTYPE_PKTAP, so files written with
 269          * this version of libpcap for a DLT_PKTAP capture have a link-
 270          * layer header type of LINKTYPE_PKTAP.
 271          *
 272          * However, files written on OS X Mavericks for a DLT_PKTAP
 273          * capture have a link-layer header type of LINKTYPE_USER2.
 274          * If we don't have a printer for DLT_USER2, and type is
 275          * DLT_USER2, we look up the printer for DLT_PKTAP and use
 276          * that.
 277          */
 278         if (type == DLT_USER2) {
 279                 for (p = printers; p->f; ++p)
 280                         if (DLT_PKTAP == p->type)
 281                                 return p->f;
 282         }
 283 #endif
 284
 285         return NULL;
 286         /* NOTREACHED */
 287 }
 288
 289 int
 290 has_printer(int type)
 291 {
 292         return (lookup_printer(type) != NULL);
 293 }
 294
 295 if_printer
 296 get_if_printer(int type)
 297 {
 298         if_printer printer;
 299
 300         printer = lookup_printer(type);
 301         if (printer == NULL)
 302                 printer = unsupported_if_print;
 303         return printer;
 304 }
 305
 306 #ifdef ENABLE_INSTRUMENT_FUNCTIONS
 307 extern int profile_func_level;
 308 static int pretty_print_packet_level = -1;
 309 #endif
 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_print_sampling && packets_captured % ndo->ndo_print_sampling != 0)
 319                 return;
 320
 321 #ifdef ENABLE_INSTRUMENT_FUNCTIONS
 322         if (pretty_print_packet_level == -1)
 323                 pretty_print_packet_level = profile_func_level;
 324 #endif
 325
 326         if (ndo->ndo_packet_number)
 327                 ND_PRINT("%5u  ", packets_captured);
 328
 329         if (ndo->ndo_lengths)
 330                 ND_PRINT("caplen %u len %u ", h->caplen, h->len);
 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         /*
 386          * The header /usr/include/pcap/pcap.h in OpenBSD declares h->ts as
 387          * struct bpf_timeval, not struct timeval. The former comes from
 388          * /usr/include/net/bpf.h and uses 32-bit unsigned types instead of
 389          * the types used in struct timeval.
 390          */
 391         struct timeval tvbuf;
 392         tvbuf.tv_sec = h->ts.tv_sec;
 393         tvbuf.tv_usec = h->ts.tv_usec;
 394         ts_print(ndo, &tvbuf);
 395
 396         /*
 397          * Printers must check that they're not walking off the end of
 398          * the packet.
 399          * Rather than pass it all the way down, we set this member
 400          * of the netdissect_options structure.
 401          */
 402         ndo->ndo_snapend = sp + h->caplen;
 403         ndo->ndo_packetp = sp;
 404
 405         ndo->ndo_protocol = "";
 406         ndo->ndo_ll_hdr_len = 0;
 407         switch (setjmp(ndo->ndo_early_end)) {
 408         case 0:
 409                 /* Print the packet. */
 410                 (ndo->ndo_if_printer)(ndo, h, sp);
 411                 break;
 412         case ND_TRUNCATED:
 413                 /* A printer quit because the packet was truncated; report it */
 414                 nd_print_trunc(ndo);
 415                 /* Print the full packet */
 416                 ndo->ndo_ll_hdr_len = 0;
 417 #ifdef ENABLE_INSTRUMENT_FUNCTIONS
 418                 /* truncation => reassignment */
 419                 profile_func_level = pretty_print_packet_level;
 420 #endif
 421                 break;
 422         }
 423         hdrlen = ndo->ndo_ll_hdr_len;
 424
 425         /*
 426          * Empty the stack of packet information, freeing all pushed buffers;
 427          * if we got here by a printer quitting, we need to release anything
 428          * that didn't get released because we longjmped out of the code
 429          * before it popped the packet information.
 430          */
 431         nd_pop_all_packet_info(ndo);
 432
 433         /*
 434          * Restore the original snapend, as a printer might have
 435          * changed it.
 436          */
 437         ndo->ndo_snapend = sp + h->caplen;
 438         if (ndo->ndo_Xflag) {
 439                 /*
 440                  * Print the raw packet data in hex and ASCII.
 441                  */
 442                 if (ndo->ndo_Xflag > 1) {
 443                         /*
 444                          * Include the link-layer header.
 445                          */
 446                         hex_and_ascii_print(ndo, "\n\t", sp, h->caplen);
 447                 } else {
 448                         /*
 449                          * Don't include the link-layer header - and if
 450                          * we have nothing past the link-layer header,
 451                          * print nothing.
 452                          */
 453                         if (h->caplen > hdrlen)
 454                                 hex_and_ascii_print(ndo, "\n\t", sp + hdrlen,
 455                                                     h->caplen - hdrlen);
 456                 }
 457         } else if (ndo->ndo_xflag) {
 458                 /*
 459                  * Print the raw packet data in hex.
 460                  */
 461                 if (ndo->ndo_xflag > 1) {
 462                         /*
 463                          * Include the link-layer header.
 464                          */
 465                         hex_print(ndo, "\n\t", sp, h->caplen);
 466                 } else {
 467                         /*
 468                          * Don't include the link-layer header - and if
 469                          * we have nothing past the link-layer header,
 470                          * print nothing.
 471                          */
 472                         if (h->caplen > hdrlen)
 473                                 hex_print(ndo, "\n\t", sp + hdrlen,
 474                                           h->caplen - hdrlen);
 475                 }
 476         } else if (ndo->ndo_Aflag) {
 477                 /*
 478                  * Print the raw packet data in ASCII.
 479                  */
 480                 if (ndo->ndo_Aflag > 1) {
 481                         /*
 482                          * Include the link-layer header.
 483                          */
 484                         ascii_print(ndo, sp, h->caplen);
 485                 } else {
 486                         /*
 487                          * Don't include the link-layer header - and if
 488                          * we have nothing past the link-layer header,
 489                          * print nothing.
 490                          */
 491                         if (h->caplen > hdrlen)
 492                                 ascii_print(ndo, sp + hdrlen, h->caplen - hdrlen);
 493                 }
 494         }
 495
 496         ND_PRINT("\n");
 497         nd_free_all(ndo);
 498 }
 499
 500 /*
 501  * By default, print the specified data out in hex and ASCII.
 502  */
 503 static void
 504 ndo_default_print(netdissect_options *ndo, const u_char *bp, u_int length)
 505 {
 506         hex_and_ascii_print(ndo, "\n\t", bp, length); /* pass on lf and indentation string */
 507 }
 508
 509 /* VARARGS */
 510 static void NORETURN PRINTFLIKE(3, 4)
 511 ndo_error(netdissect_options *ndo, status_exit_codes_t status,
 512           FORMAT_STRING(const char *fmt), ...)
 513 {
 514         va_list ap;
 515
 516         if (ndo->program_name)
 517                 (void)fprintf(stderr, "%s: ", ndo->program_name);
 518         va_start(ap, fmt);
 519         (void)vfprintf(stderr, fmt, ap);
 520         va_end(ap);
 521         if (*fmt) {
 522                 fmt += strlen(fmt);
 523                 if (fmt[-1] != '\n')
 524                         (void)fputc('\n', stderr);
 525         }
 526         nd_cleanup();
 527         exit(status);
 528         /* NOTREACHED */
 529 }
 530
 531 /* VARARGS */
 532 static void PRINTFLIKE(2, 3)
 533 ndo_warning(netdissect_options *ndo, FORMAT_STRING(const char *fmt), ...)
 534 {
 535         va_list ap;
 536
 537         if (ndo->program_name)
 538                 (void)fprintf(stderr, "%s: ", ndo->program_name);
 539         (void)fprintf(stderr, "WARNING: ");
 540         va_start(ap, fmt);
 541         (void)vfprintf(stderr, fmt, ap);
 542         va_end(ap);
 543         if (*fmt) {
 544                 fmt += strlen(fmt);
 545                 if (fmt[-1] != '\n')
 546                         (void)fputc('\n', stderr);
 547         }
 548 }
 549
 550 /* VARARGS */
 551 static int PRINTFLIKE(2, 3)
 552 ndo_printf(netdissect_options *ndo, FORMAT_STRING(const char *fmt), ...)
 553 {
 554         va_list args;
 555         int ret;
 556
 557         va_start(args, fmt);
 558         ret = vfprintf(stdout, fmt, args);
 559         va_end(args);
 560
 561         if (ret < 0)
 562                 ndo_error(ndo, S_ERR_ND_WRITE_FILE,
 563                           "Unable to write output: %s", pcap_strerror(errno));
 564         return (ret);
 565 }
 566
 567 void
 568 ndo_set_function_pointers(netdissect_options *ndo)
 569 {
 570         ndo->ndo_default_print=ndo_default_print;
 571         ndo->ndo_printf=ndo_printf;
 572         ndo->ndo_error=ndo_error;
 573         ndo->ndo_warning=ndo_warning;
 574 }