| File: | builds/wireshark/wireshark/wiretap/libpcap.c |
| Warning: | line 1438, column 3 Value stored to 'bytes_to_read' is never read |
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| 1 | /* libpcap.c |
| 2 | * |
| 3 | * Wiretap Library |
| 4 | * Copyright (c) 1998 by Gilbert Ramirez <[email protected]> |
| 5 | * |
| 6 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 7 | */ |
| 8 | |
| 9 | #include "config.h" |
| 10 | #include "libpcap.h" |
| 11 | |
| 12 | #include <stdlib.h> |
| 13 | #include <string.h> |
| 14 | #include "wtap-int.h" |
| 15 | #include "file_wrappers.h" |
| 16 | #include "required_file_handlers.h" |
| 17 | #include "pcap-common.h" |
| 18 | #include "pcap-encap.h" |
| 19 | #include "erf-common.h" |
| 20 | #include <wsutil/ws_assert.h> |
| 21 | |
| 22 | /* See source to the "libpcap" library for information on the "libpcap" |
| 23 | file format. */ |
| 24 | |
| 25 | /* |
| 26 | * Private per-wtap_t data needed to read a file. |
| 27 | */ |
| 28 | typedef enum { |
| 29 | NOT_SWAPPED, |
| 30 | SWAPPED, |
| 31 | MAYBE_SWAPPED |
| 32 | } swapped_type_t; |
| 33 | |
| 34 | /* |
| 35 | * Variants of pcap, some distinguished by the magic number and some, |
| 36 | * alas, not. |
| 37 | * |
| 38 | * (Don't do that. Srsly.) |
| 39 | */ |
| 40 | typedef enum { |
| 41 | PCAP, /* OG pcap */ |
| 42 | PCAP_NSEC, /* PCAP with nanosecond resolution */ |
| 43 | PCAP_AIX, /* AIX pcap */ |
| 44 | PCAP_SS990417, /* Modified, from 1999-04-17 patch */ |
| 45 | PCAP_SS990915, /* Modified, from 1999-09-15 patch */ |
| 46 | PCAP_SS991029, /* Modified, from 1999-10-29 patch */ |
| 47 | PCAP_NOKIA, /* Nokia pcap */ |
| 48 | PCAP_UNKNOWN /* Unknown as yet */ |
| 49 | } pcap_variant_t; |
| 50 | |
| 51 | typedef struct { |
| 52 | bool_Bool byte_swapped; |
| 53 | swapped_type_t lengths_swapped; |
| 54 | uint16_t version_major; |
| 55 | uint16_t version_minor; |
| 56 | pcap_variant_t variant; |
| 57 | int fcs_len; |
| 58 | void *encap_priv; |
| 59 | } libpcap_t; |
| 60 | |
| 61 | /* Try to read the first few records of the capture file. */ |
| 62 | static bool_Bool libpcap_try_variants(wtap *wth, const pcap_variant_t *variants, |
| 63 | size_t n_variants, int *err, char **err_info); |
| 64 | static int libpcap_try_variant(wtap *wth, pcap_variant_t variant, |
| 65 | int *err, char **err_info); |
| 66 | typedef enum { |
| 67 | TRY_REC_KEEP_READING, /* Keep reading records */ |
| 68 | TRY_REC_EOF, /* EOF - no ore records to read */ |
| 69 | TRY_REC_ERROR /* Error - give up */ |
| 70 | } try_record_ret_t; |
| 71 | static try_record_ret_t libpcap_try_record(wtap *wth, pcap_variant_t variant, |
| 72 | int *figure_of_meritp, int *err, char **err_info); |
| 73 | |
| 74 | static bool_Bool libpcap_read(wtap *wth, wtap_rec *rec, Buffer *buf, |
| 75 | int *err, char **err_info, int64_t *data_offset); |
| 76 | static bool_Bool libpcap_seek_read(wtap *wth, int64_t seek_off, |
| 77 | wtap_rec *rec, Buffer *buf, int *err, char **err_info); |
| 78 | static bool_Bool libpcap_read_packet(wtap *wth, FILE_T fh, |
| 79 | wtap_rec *rec, Buffer *buf, int *err, char **err_info); |
| 80 | static bool_Bool libpcap_read_header(wtap *wth, FILE_T fh, int *err, char **err_info, |
| 81 | struct pcaprec_ss990915_hdr *hdr); |
| 82 | static void libpcap_close(wtap *wth); |
| 83 | |
| 84 | static bool_Bool libpcap_dump_pcap(wtap_dumper *wdh, const wtap_rec *rec, |
| 85 | const uint8_t *pd, int *err, char **err_info); |
| 86 | static bool_Bool libpcap_dump_pcap_nsec(wtap_dumper *wdh, const wtap_rec *rec, |
| 87 | const uint8_t *pd, int *err, char **err_info); |
| 88 | static bool_Bool libpcap_dump_pcap_ss990417(wtap_dumper *wdh, |
| 89 | const wtap_rec *rec, const uint8_t *pd, int *err, char **err_info); |
| 90 | static bool_Bool libpcap_dump_pcap_ss990915(wtap_dumper *wdh, |
| 91 | const wtap_rec *rec, const uint8_t *pd, int *err, char **err_info); |
| 92 | static bool_Bool libpcap_dump_pcap_ss991029(wtap_dumper *wdh, |
| 93 | const wtap_rec *rec, const uint8_t *pd, int *err, char **err_info); |
| 94 | static bool_Bool libpcap_dump_pcap_nokia(wtap_dumper *wdh, const wtap_rec *rec, |
| 95 | const uint8_t *pd, int *err, char **err_info); |
| 96 | |
| 97 | /* |
| 98 | * Subfields of the field containing the link-layer header type. |
| 99 | * |
| 100 | * Link-layer header types are assigned for both pcap and |
| 101 | * pcapng, and the same value must work with both. In pcapng, |
| 102 | * the link-layer header type field in an Interface Description |
| 103 | * Block is 16 bits, so only the bottommost 16 bits of the |
| 104 | * link-layer header type in a pcap file can be used for the |
| 105 | * header type value. |
| 106 | * |
| 107 | * In libpcap, the upper 16 bits, from the top down, are divided into: |
| 108 | * |
| 109 | * A 4-bit "FCS length" field, to allow the FCS length to |
| 110 | * be specified, just as it can be specified in the if_fcslen |
| 111 | * field of the pcapng IDB. The field is in units of 16 bits, |
| 112 | * i.e. 1 means 16 bits of FCS, 2 means 32 bits of FCS, etc.. |
| 113 | * |
| 114 | * A reserved bit, which must be zero. |
| 115 | * |
| 116 | * An "FCS length present" flag; if 0, the "FCS length" field |
| 117 | * should be ignored, and if 1, the "FCS length" field should |
| 118 | * be used. |
| 119 | * |
| 120 | * 10 reserved bits, which must be zero. They were originally |
| 121 | * intended to be used as a "class" field, allowing additional |
| 122 | * classes of link-layer types to be defined, with a class value |
| 123 | * of 0 indicating that the link-layer type is a LINKTYPE_ value. |
| 124 | * A value of 0x224 was, at one point, used by NetBSD to define |
| 125 | * "raw" packet types, with the lower 16 bits containing a |
| 126 | * NetBSD AF_ value; see |
| 127 | * |
| 128 | * https://marc.info/?l=tcpdump-workers&m=98296750229149&w=2 |
| 129 | * |
| 130 | * It's unknown whether those were ever used in capture files, |
| 131 | * or if the intent was just to use it as a link-layer type |
| 132 | * for BPF programs; NetBSD's libpcap used to support them in |
| 133 | * the BPF code generator, but it no longer does so. If it |
| 134 | * was ever used in capture files, or if classes other than |
| 135 | * "LINKTYPE_ value" are ever useful in capture files, we could |
| 136 | * re-enable this, and use the reserved 16 bits following the |
| 137 | * link-layer type in pcapng files to hold the class information |
| 138 | * there. (Note, BTW, that LINKTYPE_RAW/DLT_RAW is now being |
| 139 | * interpreted by libpcap, tcpdump, and Wireshark as "raw IP", |
| 140 | * including both IPv4 and IPv6, with the version number in the |
| 141 | * header being checked to see which it is, not just "raw IPv4"; |
| 142 | * there are LINKTYPE_IPV4/DLT_IPV4 and LINKTYPE_IPV6/DLT_IPV6 |
| 143 | * values if "these are IPv{4,6} and only IPv{4,6} packets" |
| 144 | * types are needed.) |
| 145 | * |
| 146 | * Or we might be able to use it for other purposes. |
| 147 | */ |
| 148 | #define LT_LINKTYPE(x)((x) & 0x0000FFFF) ((x) & 0x0000FFFF) |
| 149 | #define LT_RESERVED1(x)((x) & 0x03FF0000) ((x) & 0x03FF0000) |
| 150 | #define LT_FCS_LENGTH_PRESENT(x)((x) & 0x04000000) ((x) & 0x04000000) |
| 151 | #define LT_FCS_LENGTH(x)(((x) & 0xF0000000) >> 28) (((x) & 0xF0000000) >> 28) |
| 152 | #define LT_FCS_DATALINK_EXT(x)(((x) & 0xF) << 28) | 0x04000000) (((x) & 0xF) << 28) | 0x04000000) |
| 153 | |
| 154 | /* |
| 155 | * Private file type/subtype values; pcap and nanosecond-resolution |
| 156 | * pcap are imported from wiretap/file_access.c. |
| 157 | */ |
| 158 | static int pcap_aix_file_type_subtype = -1; |
| 159 | static int pcap_ss990417_file_type_subtype = -1; |
| 160 | static int pcap_ss990915_file_type_subtype = -1; |
| 161 | static int pcap_ss991029_file_type_subtype = -1; |
| 162 | static int pcap_nokia_file_type_subtype = -1; |
| 163 | |
| 164 | /* |
| 165 | * pcap variants that use the standard magic number. |
| 166 | */ |
| 167 | static const pcap_variant_t variants_standard[] = { |
| 168 | PCAP, |
| 169 | PCAP_SS990417, |
| 170 | PCAP_NOKIA |
| 171 | }; |
| 172 | #define N_VARIANTS_STANDARD(sizeof (variants_standard) / sizeof ((variants_standard)[0]) ) G_N_ELEMENTS(variants_standard)(sizeof (variants_standard) / sizeof ((variants_standard)[0]) ) |
| 173 | |
| 174 | /* |
| 175 | * pcap variants that use the modified magic number. |
| 176 | */ |
| 177 | static const pcap_variant_t variants_modified[] = { |
| 178 | PCAP_SS991029, |
| 179 | PCAP_SS990915 |
| 180 | }; |
| 181 | #define N_VARIANTS_MODIFIED(sizeof (variants_modified) / sizeof ((variants_modified)[0]) ) G_N_ELEMENTS(variants_modified)(sizeof (variants_modified) / sizeof ((variants_modified)[0]) ) |
| 182 | |
| 183 | wtap_open_return_val libpcap_open(wtap *wth, int *err, char **err_info) |
| 184 | { |
| 185 | uint32_t magic; |
| 186 | struct pcap_hdr hdr; |
| 187 | bool_Bool byte_swapped; |
| 188 | pcap_variant_t variant; |
| 189 | libpcap_t *libpcap; |
| 190 | bool_Bool skip_ixia_extra = false0; |
| 191 | |
| 192 | /* Read in the number that should be at the start of a "libpcap" file */ |
| 193 | if (!wtap_read_bytes(wth->fh, &magic, sizeof magic, err, err_info)) { |
| 194 | if (*err != WTAP_ERR_SHORT_READ-12) |
| 195 | return WTAP_OPEN_ERROR; |
| 196 | return WTAP_OPEN_NOT_MINE; |
| 197 | } |
| 198 | |
| 199 | switch (magic) { |
| 200 | |
| 201 | case PCAP_MAGIC0xa1b2c3d4: |
| 202 | /* Host that wrote it has our byte order, and was running |
| 203 | a program using either standard or ss990417 libpcap, |
| 204 | or maybe it was written by AIX. That means we don't |
| 205 | yet know the variant. */ |
| 206 | byte_swapped = false0; |
| 207 | variant = PCAP_UNKNOWN; |
| 208 | break; |
| 209 | |
| 210 | case PCAP_SWAPPED_MAGIC0xd4c3b2a1: |
| 211 | /* Host that wrote it has a byte order opposite to ours, |
| 212 | and was running a program using either standard or |
| 213 | ss990417 libpcap, or maybe it was written by AIX. |
| 214 | That means we don't yet know the variant. */ |
| 215 | byte_swapped = true1; |
| 216 | variant = PCAP_UNKNOWN; |
| 217 | break; |
| 218 | |
| 219 | case PCAP_IXIAHW_MAGIC0x1c0001ac: |
| 220 | /* Ixia "lcap" hardware-capture variant, in our |
| 221 | byte order, in which there's an extra 4-byte |
| 222 | field at the end of the file header, containing |
| 223 | the total number of bytes of packet records in |
| 224 | the file, i.e. the file size minus the file header |
| 225 | size. It's otherwise like standard pcap, with |
| 226 | nanosecond time-stamp resolution. |
| 227 | |
| 228 | See issue #14073. */ |
| 229 | skip_ixia_extra = true1; |
| 230 | byte_swapped = false0; |
| 231 | variant = PCAP_NSEC; |
| 232 | break; |
| 233 | |
| 234 | case PCAP_SWAPPED_IXIAHW_MAGIC0xac01001c: |
| 235 | /* Ixia "lcap" hardware-capture variant, in a byte |
| 236 | order opposite to ours, in which there's an extra |
| 237 | 4-byte field at the end of the file header, |
| 238 | containing the total number of bytes of packet |
| 239 | records in the file, i.e. the file size minus |
| 240 | the file header size. It's otherwise like standard |
| 241 | pcap with nanosecond time-stamp resolution. |
| 242 | |
| 243 | See issue #14073. */ |
| 244 | skip_ixia_extra = true1; |
| 245 | byte_swapped = true1; |
| 246 | variant = PCAP_NSEC; |
| 247 | break; |
| 248 | |
| 249 | case PCAP_IXIASW_MAGIC0x1c0001ab: |
| 250 | /* Ixia "lcap" software-capture variant, in our |
| 251 | byte order, in which there's an extra 4-byte |
| 252 | field at the end of the file header, containing |
| 253 | the total number of bytes of packet records in |
| 254 | the file, i.e. the file size minus the file header |
| 255 | size. It's otherwise like standard pcap, with |
| 256 | microsecond time-stamp resolution. |
| 257 | |
| 258 | See issue #14073. */ |
| 259 | skip_ixia_extra = true1; |
| 260 | byte_swapped = false0; |
| 261 | variant = PCAP; |
| 262 | break; |
| 263 | |
| 264 | case PCAP_SWAPPED_IXIASW_MAGIC0xab01001c: |
| 265 | /* Ixia "lcap" software-capture variant, in a byte |
| 266 | order opposite to ours, in which there's an extra |
| 267 | 4-byte field at the end of the file header, |
| 268 | containing the total number of bytes of packet |
| 269 | records in the file, i.e. the file size minus |
| 270 | the file header size. It's otherwise like standard |
| 271 | pcap with microsecond time-stamp resolution. |
| 272 | |
| 273 | See issue #14073. */ |
| 274 | skip_ixia_extra = true1; |
| 275 | byte_swapped = true1; |
| 276 | variant = PCAP; |
| 277 | break; |
| 278 | |
| 279 | case PCAP_MODIFIED_MAGIC0xa1b2cd34: |
| 280 | /* Host that wrote it has our byte order, and was running |
| 281 | a program using either ss990915 or ss991029 libpcap. |
| 282 | That means we don't yet know the variant; there's |
| 283 | no obvious default, so default to "unknown". */ |
| 284 | byte_swapped = false0; |
| 285 | variant = PCAP_UNKNOWN; |
| 286 | break; |
| 287 | |
| 288 | case PCAP_SWAPPED_MODIFIED_MAGIC0x34cdb2a1: |
| 289 | /* Host that wrote it out has a byte order opposite to |
| 290 | ours, and was running a program using either ss990915 |
| 291 | or ss991029 libpcap. That means we don't yet know |
| 292 | the variant; there's no obvious default, so default |
| 293 | to "unknown". */ |
| 294 | byte_swapped = true1; |
| 295 | variant = PCAP_UNKNOWN; |
| 296 | break; |
| 297 | |
| 298 | case PCAP_NSEC_MAGIC0xa1b23c4d: |
| 299 | /* Host that wrote it has our byte order, and was writing |
| 300 | the file in a format similar to standard libpcap |
| 301 | except that the time stamps have nanosecond resolution. */ |
| 302 | byte_swapped = false0; |
| 303 | variant = PCAP_NSEC; |
| 304 | break; |
| 305 | |
| 306 | case PCAP_SWAPPED_NSEC_MAGIC0x4d3cb2a1: |
| 307 | /* Host that wrote it out has a byte order opposite to |
| 308 | ours, and was writing the file in a format similar to |
| 309 | standard libpcap except that the time stamps have |
| 310 | nanosecond resolution. */ |
| 311 | byte_swapped = true1; |
| 312 | variant = PCAP_NSEC; |
| 313 | break; |
| 314 | |
| 315 | default: |
| 316 | /* Not a "libpcap" type we know about. */ |
| 317 | return WTAP_OPEN_NOT_MINE; |
| 318 | } |
| 319 | |
| 320 | /* Read the rest of the header. */ |
| 321 | if (!wtap_read_bytes(wth->fh, &hdr, sizeof hdr, err, err_info)) |
| 322 | return WTAP_OPEN_ERROR; |
| 323 | if (skip_ixia_extra) { |
| 324 | /* |
| 325 | * Skip 4 bytes of size information in the file header. |
| 326 | */ |
| 327 | if (!wtap_read_bytes(wth->fh, NULL((void*)0), 4, err, err_info)) |
| 328 | return WTAP_OPEN_ERROR; |
| 329 | } |
| 330 | |
| 331 | if (byte_swapped) { |
| 332 | /* Byte-swap the header fields about which we care. */ |
| 333 | magic = GUINT32_SWAP_LE_BE(magic)(((guint32) ( (((guint32) (magic) & (guint32) 0x000000ffU ) << 24) | (((guint32) (magic) & (guint32) 0x0000ff00U ) << 8) | (((guint32) (magic) & (guint32) 0x00ff0000U ) >> 8) | (((guint32) (magic) & (guint32) 0xff000000U ) >> 24)))); |
| 334 | hdr.version_major = GUINT16_SWAP_LE_BE(hdr.version_major)(((guint16) ( (guint16) ((guint16) (hdr.version_major) >> 8) | (guint16) ((guint16) (hdr.version_major) << 8)))); |
| 335 | hdr.version_minor = GUINT16_SWAP_LE_BE(hdr.version_minor)(((guint16) ( (guint16) ((guint16) (hdr.version_minor) >> 8) | (guint16) ((guint16) (hdr.version_minor) << 8)))); |
| 336 | hdr.snaplen = GUINT32_SWAP_LE_BE(hdr.snaplen)(((guint32) ( (((guint32) (hdr.snaplen) & (guint32) 0x000000ffU ) << 24) | (((guint32) (hdr.snaplen) & (guint32) 0x0000ff00U ) << 8) | (((guint32) (hdr.snaplen) & (guint32) 0x00ff0000U ) >> 8) | (((guint32) (hdr.snaplen) & (guint32) 0xff000000U ) >> 24)))); |
| 337 | hdr.network = GUINT32_SWAP_LE_BE(hdr.network)(((guint32) ( (((guint32) (hdr.network) & (guint32) 0x000000ffU ) << 24) | (((guint32) (hdr.network) & (guint32) 0x0000ff00U ) << 8) | (((guint32) (hdr.network) & (guint32) 0x00ff0000U ) >> 8) | (((guint32) (hdr.network) & (guint32) 0xff000000U ) >> 24)))); |
| 338 | } |
| 339 | if (hdr.version_major < 2) { |
| 340 | /* We only support version 2.0 and later. */ |
| 341 | *err = WTAP_ERR_UNSUPPORTED-4; |
| 342 | *err_info = ws_strdup_printf("pcap: major version %u unsupported",wmem_strdup_printf(((void*)0), "pcap: major version %u unsupported" , hdr.version_major) |
| 343 | hdr.version_major)wmem_strdup_printf(((void*)0), "pcap: major version %u unsupported" , hdr.version_major); |
| 344 | return WTAP_OPEN_ERROR; |
| 345 | } |
| 346 | |
| 347 | /* This is a libpcap file */ |
| 348 | wth->subtype_read = libpcap_read; |
| 349 | wth->subtype_seek_read = libpcap_seek_read; |
| 350 | wth->subtype_close = libpcap_close; |
| 351 | wth->snapshot_length = hdr.snaplen; |
| 352 | libpcap = g_new0(libpcap_t, 1)((libpcap_t *) g_malloc0_n ((1), sizeof (libpcap_t))); |
| 353 | wth->priv = (void *)libpcap; |
| 354 | /* |
| 355 | * Fill in the information we already know or can determine |
| 356 | * at this point, so the private data is usable by the code |
| 357 | * that tries reading packets as a heuristic to guess the |
| 358 | * variant. |
| 359 | */ |
| 360 | libpcap->byte_swapped = byte_swapped; |
| 361 | /* In file format version 2.3, the order of the "incl_len" and |
| 362 | "orig_len" fields in the per-packet header was reversed, |
| 363 | in order to match the BPF header layout. |
| 364 | |
| 365 | Therefore, in files with versions prior to that, we must swap |
| 366 | those two fields. |
| 367 | |
| 368 | Unfortunately, some files were, according to a comment in the |
| 369 | "libpcap" source, written with version 2.3 in their headers |
| 370 | but without the interchanged fields, so if "incl_len" is |
| 371 | greater than "orig_len" - which would make no sense - we |
| 372 | assume that we need to swap them in version 2.3 files |
| 373 | as well. |
| 374 | |
| 375 | In addition, DG/UX's tcpdump uses version 543.0, and writes |
| 376 | the two fields in the pre-2.3 order. |
| 377 | |
| 378 | Furthermore, files that don't have a magic number of 2.4 |
| 379 | were not used by the variant forms of pcap that need |
| 380 | heuristic tests to detect. */ |
| 381 | switch (hdr.version_major) { |
| 382 | |
| 383 | case 2: |
| 384 | if (hdr.version_minor < 3) { |
| 385 | libpcap->lengths_swapped = SWAPPED; |
| 386 | variant = PCAP; |
| 387 | } else if (hdr.version_minor == 3) { |
| 388 | libpcap->lengths_swapped = MAYBE_SWAPPED; |
| 389 | variant = PCAP; |
| 390 | } else |
| 391 | libpcap->lengths_swapped = NOT_SWAPPED; |
| 392 | break; |
| 393 | |
| 394 | case 543: |
| 395 | libpcap->lengths_swapped = SWAPPED; |
| 396 | variant = PCAP; |
| 397 | break; |
| 398 | |
| 399 | default: |
| 400 | libpcap->lengths_swapped = NOT_SWAPPED; |
| 401 | break; |
| 402 | } |
| 403 | libpcap->version_major = hdr.version_major; |
| 404 | libpcap->version_minor = hdr.version_minor; |
| 405 | /* |
| 406 | * Check whether this is an AIX pcap before we convert the |
| 407 | * link-layer type in the header file to an encapsulation, |
| 408 | * because AIX pcaps use RFC 1573 ifType values in the header. |
| 409 | * |
| 410 | * AIX pcap files use the standard magic number, and have a |
| 411 | * major and minor version of 2. |
| 412 | * |
| 413 | * Unfortunately, that's also true of older versions of libpcap, |
| 414 | * so we need to do some heuristics to try to identify AIX pcap |
| 415 | * files. |
| 416 | */ |
| 417 | if (magic == PCAP_MAGIC0xa1b2c3d4 && hdr.version_major == 2 && |
| 418 | hdr.version_minor == 2) { |
| 419 | /* |
| 420 | * The AIX libpcap uses RFC 1573 ifType values rather |
| 421 | * than LINKTYPE_/DLT_ values in the header; the ifType |
| 422 | * values for LAN devices are: |
| 423 | * |
| 424 | * Ethernet 6 |
| 425 | * Token Ring 9 |
| 426 | * FDDI 15 |
| 427 | * |
| 428 | * which correspond to LINKTYPE_IEEE802_5/DLT_IEEE802 (used |
| 429 | * for Token Ring), LINKTYPE_PPP/DLT_PPP, and |
| 430 | * LINKTYPE_SLIP_BSDOS/DLT_SLIP_BSDOS, respectively, and |
| 431 | * the ifType value for a loopback interface is 24, which |
| 432 | * currently isn't used by any version of libpcap I know |
| 433 | * about (and, as tcpdump.org are assigning LINKTYPE_/DLT_ |
| 434 | * values above 100, and NetBSD started assigning values |
| 435 | * starting at 50, and the values chosen by other libpcaps |
| 436 | * appear to stop at 19, it's probably not going to be used |
| 437 | * by any libpcap in the future). |
| 438 | * |
| 439 | * So we shall assume that if the network type is 6, 9, 15, |
| 440 | * or 24 it's AIX libpcap. |
| 441 | * |
| 442 | * We also assume those older versions of libpcap didn't use |
| 443 | * LINKTYPE_IEEE802_5/DLT_IEEE802 for Token Ring, and didn't |
| 444 | * use LINKTYPE_SLIP_BSDOS/DLT_SLIP_BSDOS as that came later. |
| 445 | * It may have used LINKTYPE_PPP/DLT_PPP, however, in which |
| 446 | * case we're out of luck; we assume it's Token Ring in AIX |
| 447 | * libpcap rather than PPP in standard libpcap, as you're |
| 448 | * probably more likely to be handing an AIX libpcap token- |
| 449 | *ring capture than an old (pre-libpcap 0.4) PPP capture to |
| 450 | * Wireshark. |
| 451 | * |
| 452 | * AIX pcap files didn't use the upper 16 bits, so we don't |
| 453 | * need to ignore them here - they'll be 0. |
| 454 | */ |
| 455 | switch (hdr.network) { |
| 456 | |
| 457 | case 6: |
| 458 | hdr.network = 1; /* LINKTYPE_EN10MB, Ethernet */ |
| 459 | variant = PCAP_AIX; |
| 460 | break; |
| 461 | |
| 462 | case 9: |
| 463 | hdr.network = 6; /* LINKTYPE_IEEE802_5, Token Ring */ |
| 464 | variant = PCAP_AIX; |
| 465 | break; |
| 466 | |
| 467 | case 15: |
| 468 | hdr.network = 10; /* LINKTYPE_FDDI, FDDI */ |
| 469 | variant = PCAP_AIX; |
| 470 | break; |
| 471 | |
| 472 | case 24: |
| 473 | hdr.network = 0; /* LINKTYPE_NULL, loopback */ |
| 474 | variant = PCAP_AIX; |
| 475 | break; |
| 476 | } |
| 477 | } |
| 478 | |
| 479 | /* |
| 480 | * Check the main reserved field. |
| 481 | */ |
| 482 | if (LT_RESERVED1(hdr.network)((hdr.network) & 0x03FF0000) != 0) { |
| 483 | *err = WTAP_ERR_UNSUPPORTED-4; |
| 484 | *err_info = ws_strdup_printf("pcap: network type reserved field not zero (0x%08x)",wmem_strdup_printf(((void*)0), "pcap: network type reserved field not zero (0x%08x)" , ((hdr.network) & 0x03FF0000)) |
| 485 | LT_RESERVED1(hdr.network))wmem_strdup_printf(((void*)0), "pcap: network type reserved field not zero (0x%08x)" , ((hdr.network) & 0x03FF0000)); |
| 486 | return WTAP_OPEN_ERROR; |
| 487 | } |
| 488 | |
| 489 | /* |
| 490 | * Map the link-layer type from the "network" field in |
| 491 | * the header to a Wiretap encapsulation. |
| 492 | */ |
| 493 | wth->file_encap = wtap_pcap_encap_to_wtap_encap(LT_LINKTYPE(hdr.network)((hdr.network) & 0x0000FFFF)); |
| 494 | if (wth->file_encap == WTAP_ENCAP_UNKNOWN0) { |
| 495 | *err = WTAP_ERR_UNSUPPORTED-4; |
| 496 | *err_info = ws_strdup_printf("pcap: network type %u unknown or unsupported",wmem_strdup_printf(((void*)0), "pcap: network type %u unknown or unsupported" , hdr.network) |
| 497 | hdr.network)wmem_strdup_printf(((void*)0), "pcap: network type %u unknown or unsupported" , hdr.network); |
| 498 | return WTAP_OPEN_ERROR; |
| 499 | } |
| 500 | |
| 501 | /* |
| 502 | * Extract the FCS information, if present. |
| 503 | */ |
| 504 | libpcap->fcs_len = -1; |
| 505 | if (LT_FCS_LENGTH_PRESENT(hdr.network)((hdr.network) & 0x04000000)) { |
| 506 | /* |
| 507 | * We have an FCS length, in units of 16 bits. |
| 508 | * Convert it to bits. |
| 509 | */ |
| 510 | libpcap->fcs_len = LT_FCS_LENGTH(hdr.network)(((hdr.network) & 0xF0000000) >> 28) * 16; |
| 511 | } |
| 512 | |
| 513 | libpcap->encap_priv = NULL((void*)0); |
| 514 | |
| 515 | /* |
| 516 | * If this file has the standard magic number, it could be |
| 517 | * one of a number of variants, including regular pcap, the |
| 518 | * AIX variant, the ss990417 variant, and a Nokia variant. |
| 519 | * The ss990417 variant is used in, for example, Red Hat 6.1, |
| 520 | * so some versions of AIX, RH 6.1, and some Nokia devices |
| 521 | * write files that can't be read by any software that expects |
| 522 | * standard libpcap packet record headers if the magic number |
| 523 | * is the standard magic number (e.g., any program such as |
| 524 | * tcpdump that uses libpcap, when using the standard libpcap, |
| 525 | * and Wireshark if we don't do the heuristics below). |
| 526 | * |
| 527 | * If this file has the patched magic number, used by the |
| 528 | * ss990915 and ss991029 variants, then it could be either |
| 529 | * of those. The ss991029 variant uses the same packet |
| 530 | * record header as the ss990417 variant, but the ss990915 |
| 531 | * variant uses a packet record header with some additional |
| 532 | * fields and it is used in, for example, SuSE 6.3, so SuSE |
| 533 | * 6.3 writes files that can't be read by any software that |
| 534 | * expects ss990417 packet record headers if the magic number |
| 535 | * is the modified magic number. |
| 536 | * |
| 537 | * So, for the standard and modified magic number: |
| 538 | * |
| 539 | * For the standard magic number, we first do some heuristic |
| 540 | * checks of data from the file header to see if it looks like |
| 541 | * an AIX libpcap file. If so, we choose PCAP_AIX as the variant, |
| 542 | * and we don't have to do any more guessing. |
| 543 | * |
| 544 | * Otherwise, we determine the variant by, for each variant, |
| 545 | * trying to read the first few packets as if that file were |
| 546 | * in that variant's format, and seeing whether the packet |
| 547 | * record headers make sense. |
| 548 | * |
| 549 | * But don't do the latter if the input is a pipe; that would mean |
| 550 | * the open won't complete until two packets have been written to |
| 551 | * the pipe, unless the pipe is closed after one packet has been |
| 552 | * written, so a program reading from the file won't see the |
| 553 | * first packet until the second packet has been written. |
| 554 | */ |
| 555 | switch (magic) { |
| 556 | |
| 557 | case PCAP_MAGIC0xa1b2c3d4: |
| 558 | /* |
| 559 | * Original libpcap magic. |
| 560 | * |
| 561 | * If we still don't know the variant, look at the first |
| 562 | * few packets to see what type of per-packet header they |
| 563 | * have. |
| 564 | * |
| 565 | * Default to PCAP, as that's probably what this is; |
| 566 | * libpcap_try_variants() will just give up if we're |
| 567 | * reading from a pipe. |
| 568 | */ |
| 569 | if (variant == PCAP_UNKNOWN) { |
| 570 | if (wth->ispipe) { |
| 571 | /* |
| 572 | * We can't do the heuristics. |
| 573 | * Just go with standard libpcap. |
| 574 | */ |
| 575 | libpcap->variant = PCAP; |
| 576 | } else { |
| 577 | /* |
| 578 | * Try the variants that use the standard |
| 579 | * pcap magic number. |
| 580 | */ |
| 581 | if (!libpcap_try_variants(wth, variants_standard, |
| 582 | N_VARIANTS_STANDARD(sizeof (variants_standard) / sizeof ((variants_standard)[0]) ), err, err_info)) { |
| 583 | /* |
| 584 | * File read error. |
| 585 | */ |
| 586 | return WTAP_OPEN_ERROR; |
| 587 | } |
| 588 | } |
| 589 | } else { |
| 590 | /* |
| 591 | * Use the variant we found. |
| 592 | */ |
| 593 | libpcap->variant = variant; |
| 594 | } |
| 595 | break; |
| 596 | |
| 597 | case PCAP_MODIFIED_MAGIC0xa1b2cd34: |
| 598 | /* |
| 599 | * Modified libpcap magic, from Alexey's later two |
| 600 | * patches. |
| 601 | * |
| 602 | * This might be one of two different flavors of |
| 603 | * pcap file, with different modified per-packet |
| 604 | * headers. |
| 605 | * |
| 606 | * If we're reading from a pipe, we don't have an |
| 607 | * obvious choice to use as a default. |
| 608 | */ |
| 609 | if (wth->ispipe) { |
| 610 | /* |
| 611 | * We can't do the heuristics. |
| 612 | * There's no obvious choice to use as a |
| 613 | * default, so just report an error. |
| 614 | */ |
| 615 | *err = WTAP_ERR_UNSUPPORTED-4; |
| 616 | *err_info = g_strdup("pcap: that type of pcap file can't be read from a pipe")g_strdup_inline ("pcap: that type of pcap file can't be read from a pipe" ); |
| 617 | return WTAP_OPEN_ERROR; |
| 618 | } else { |
| 619 | /* |
| 620 | * Try the variants that use the modified |
| 621 | * pcap magic number. |
| 622 | */ |
| 623 | if (!libpcap_try_variants(wth, variants_modified, |
| 624 | N_VARIANTS_MODIFIED(sizeof (variants_modified) / sizeof ((variants_modified)[0]) ), err, err_info)) { |
| 625 | /* |
| 626 | * File read error. |
| 627 | */ |
| 628 | return WTAP_OPEN_ERROR; |
| 629 | } |
| 630 | } |
| 631 | break; |
| 632 | |
| 633 | default: |
| 634 | /* |
| 635 | * None of these require heuristics to guess the |
| 636 | * variant; just use the variant we found. |
| 637 | */ |
| 638 | libpcap->variant = variant; |
| 639 | break; |
| 640 | } |
| 641 | |
| 642 | /* |
| 643 | * Set the file type and subtype, and handle some variants |
| 644 | * specially. |
| 645 | */ |
| 646 | switch (libpcap->variant) { |
| 647 | |
| 648 | case PCAP: |
| 649 | wth->file_type_subtype = pcap_file_type_subtype; |
| 650 | wth->file_tsprec = WTAP_TSPREC_USEC6; |
| 651 | break; |
| 652 | |
| 653 | case PCAP_NSEC: |
| 654 | wth->file_type_subtype = pcap_nsec_file_type_subtype; |
| 655 | wth->file_tsprec = WTAP_TSPREC_NSEC9; |
| 656 | break; |
| 657 | |
| 658 | case PCAP_SS990417: |
| 659 | wth->file_type_subtype = pcap_ss990417_file_type_subtype; |
| 660 | wth->file_tsprec = WTAP_TSPREC_USEC6; |
| 661 | break; |
| 662 | |
| 663 | case PCAP_SS990915: |
| 664 | wth->file_type_subtype = pcap_ss990915_file_type_subtype; |
| 665 | wth->file_tsprec = WTAP_TSPREC_USEC6; |
| 666 | break; |
| 667 | |
| 668 | case PCAP_SS991029: |
| 669 | wth->file_type_subtype = pcap_ss991029_file_type_subtype; |
| 670 | wth->file_tsprec = WTAP_TSPREC_USEC6; |
| 671 | break; |
| 672 | |
| 673 | case PCAP_AIX: |
| 674 | wth->file_type_subtype = pcap_aix_file_type_subtype; |
| 675 | wth->file_tsprec = WTAP_TSPREC_NSEC9; |
| 676 | break; |
| 677 | |
| 678 | case PCAP_NOKIA: |
| 679 | wth->file_type_subtype = pcap_nokia_file_type_subtype; |
| 680 | wth->file_tsprec = WTAP_TSPREC_USEC6; |
| 681 | /* |
| 682 | * We treat a DLT_ value of 13 specially - it appears |
| 683 | * that in Nokia libpcap format, it's some form of ATM |
| 684 | * with what I suspect is a pseudo-header (even though |
| 685 | * Nokia's IPSO is based on FreeBSD, which #defines |
| 686 | * DLT_SLIP_BSDOS as 13). |
| 687 | * |
| 688 | * Treat 13 as WTAP_ENCAP_ATM_PDUS, rather than as what |
| 689 | * we normally treat it. |
| 690 | */ |
| 691 | switch (hdr.network) { |
| 692 | |
| 693 | case 13: |
| 694 | wth->file_encap = WTAP_ENCAP_ATM_PDUS13; |
| 695 | break; |
| 696 | } |
| 697 | break; |
| 698 | |
| 699 | default: |
| 700 | ws_assert_not_reached()ws_log_fatal_full("", LOG_LEVEL_ERROR, "wiretap/libpcap.c", 700 , __func__, "assertion \"not reached\" failed"); |
| 701 | } |
| 702 | |
| 703 | if (wth->file_encap == WTAP_ENCAP_ERF98) { |
| 704 | /* Reset the ERF interface lookup table */ |
| 705 | libpcap->encap_priv = erf_priv_create(); |
| 706 | } else { |
| 707 | /* |
| 708 | * Add an IDB; we don't know how many interfaces were |
| 709 | * involved, so we just say one interface, about which |
| 710 | * we only know the link-layer type, snapshot length, |
| 711 | * and time stamp resolution. |
| 712 | */ |
| 713 | wtap_add_generated_idb(wth); |
| 714 | } |
| 715 | |
| 716 | return WTAP_OPEN_MINE; |
| 717 | } |
| 718 | |
| 719 | static bool_Bool libpcap_try_variants(wtap *wth, const pcap_variant_t *variants, |
| 720 | size_t n_variants, int *err, char **err_info) |
| 721 | { |
| 722 | libpcap_t *libpcap = (libpcap_t *)wth->priv; |
| 723 | #define MAX_FIGURES_OF_MERIT((((sizeof (variants_modified) / sizeof ((variants_modified)[ 0]))) > ((sizeof (variants_standard) / sizeof ((variants_standard )[0])))) ? ((sizeof (variants_modified) / sizeof ((variants_modified )[0]))) : ((sizeof (variants_standard) / sizeof ((variants_standard )[0])))) \ |
| 724 | MAX(N_VARIANTS_MODIFIED, N_VARIANTS_STANDARD)((((sizeof (variants_modified) / sizeof ((variants_modified)[ 0]))) > ((sizeof (variants_standard) / sizeof ((variants_standard )[0])))) ? ((sizeof (variants_modified) / sizeof ((variants_modified )[0]))) : ((sizeof (variants_standard) / sizeof ((variants_standard )[0])))) |
| 725 | int figures_of_merit[MAX_FIGURES_OF_MERIT((((sizeof (variants_modified) / sizeof ((variants_modified)[ 0]))) > ((sizeof (variants_standard) / sizeof ((variants_standard )[0])))) ? ((sizeof (variants_modified) / sizeof ((variants_modified )[0]))) : ((sizeof (variants_standard) / sizeof ((variants_standard )[0]))))]; |
| 726 | int best_variant; |
| 727 | int64_t first_packet_offset; |
| 728 | |
| 729 | first_packet_offset = file_tell(wth->fh); |
| 730 | for (size_t i = 0; i < n_variants; i++) { |
| 731 | figures_of_merit[i] = libpcap_try_variant(wth, variants[i], |
| 732 | err, err_info); |
| 733 | if (figures_of_merit[i] == -1) { |
| 734 | /* |
| 735 | * Well, we couldn't even read it. Give up. |
| 736 | */ |
| 737 | return false0; |
| 738 | } |
| 739 | if (figures_of_merit[i] == 0) { |
| 740 | /* |
| 741 | * This format doesn't have any issues. |
| 742 | * Put the seek pointer back, and finish, |
| 743 | * using that format as the subtype. |
| 744 | */ |
| 745 | if (file_seek(wth->fh, first_packet_offset, SEEK_SET0, |
| 746 | err) == -1) { |
| 747 | return false0; |
| 748 | } |
| 749 | libpcap->variant = variants[i]; |
| 750 | return true1; |
| 751 | } |
| 752 | |
| 753 | /* |
| 754 | * OK, we've recorded the figure of merit for this |
| 755 | * one; go back to the first packet and try the |
| 756 | * next one. |
| 757 | */ |
| 758 | if (file_seek(wth->fh, first_packet_offset, SEEK_SET0, |
| 759 | err) == -1) { |
| 760 | return false0; |
| 761 | } |
| 762 | } |
| 763 | |
| 764 | /* |
| 765 | * OK, none are perfect; let's see which one is least bad. |
| 766 | */ |
| 767 | best_variant = INT_MAX2147483647; |
| 768 | for (size_t i = 0; i < n_variants; i++) { |
| 769 | /* |
| 770 | * Is this subtype better than the last one we saw? |
| 771 | */ |
| 772 | if (figures_of_merit[i] < best_variant) { |
| 773 | /* |
| 774 | * Yes. Choose it until we find a better one. |
| 775 | */ |
| 776 | libpcap->variant = variants[i]; |
| 777 | best_variant = figures_of_merit[i]; |
| 778 | } |
| 779 | } |
| 780 | return true1; |
| 781 | } |
| 782 | |
| 783 | /* |
| 784 | * Maximum number of records to try to read. Must be >= 2. |
| 785 | */ |
| 786 | #define MAX_RECORDS_TO_TRY3 3 |
| 787 | |
| 788 | /* Try to read the first MAX_RECORDS_TO_TRY records of the capture file. */ |
| 789 | static int libpcap_try_variant(wtap *wth, pcap_variant_t variant, |
| 790 | int *err, char **err_info) |
| 791 | { |
| 792 | int figure_of_merit; |
| 793 | |
| 794 | figure_of_merit = 0; |
| 795 | |
| 796 | /* |
| 797 | * Attempt to read the MAX_RECORDS_TO_TRY records. |
| 798 | */ |
| 799 | for (unsigned int i = 0; i < MAX_RECORDS_TO_TRY3; i++) { |
| 800 | /* |
| 801 | * Attempt to read this record. |
| 802 | */ |
| 803 | try_record_ret_t try_record_ret; |
| 804 | |
| 805 | try_record_ret = libpcap_try_record(wth, variant, |
| 806 | &figure_of_merit, err, err_info); |
| 807 | |
| 808 | if (try_record_ret == TRY_REC_ERROR) { |
| 809 | /* |
| 810 | * Error; return the error indication. |
| 811 | */ |
| 812 | return -1; |
| 813 | } |
| 814 | if (try_record_ret == TRY_REC_EOF) { |
| 815 | /* |
| 816 | * Nothing more to read from this file. |
| 817 | */ |
| 818 | break; |
| 819 | } |
| 820 | } |
| 821 | |
| 822 | return figure_of_merit; |
| 823 | } |
| 824 | |
| 825 | /* Read the header of the next packet and, if that succeeds, read the |
| 826 | data of the next packet. |
| 827 | |
| 828 | Return -1 on an I/O error, 0 on success, or a positive number if the |
| 829 | header looks corrupt. The higher the positive number, the more things |
| 830 | are wrong with the header; this is used by the heuristics that try to |
| 831 | guess what type of file it is, with the type with the fewest problems |
| 832 | being chosen. */ |
| 833 | static try_record_ret_t libpcap_try_record(wtap *wth, pcap_variant_t variant, |
| 834 | int *figure_of_meritp, int *err, char **err_info) |
| 835 | { |
| 836 | libpcap_t *libpcap = (libpcap_t *)wth->priv; |
| 837 | struct pcaprec_hdr hdr; |
| 838 | /* Fields from PCAP_SS* modified headers */ |
| 839 | uint32_t ifindex; |
| 840 | uint16_t protocol; |
| 841 | uint8_t pkt_type; |
| 842 | uint32_t nokia_stuff; |
| 843 | bool_Bool incl_len_ok = true1; |
| 844 | |
| 845 | /* |
| 846 | * Read the header, one field at a time. |
| 847 | * First, do the fields that all pcap formats have - the |
| 848 | * time stamp, the captured length, and the original |
| 849 | * length. |
| 850 | */ |
| 851 | if (!wtap_read_bytes_or_eof(wth->fh, &hdr.ts_sec, 4, err, err_info)) { |
| 852 | if (*err == 0) { |
| 853 | /* |
| 854 | * EOF - assume the file is in this format. |
| 855 | * This means it doesn't have all the |
| 856 | * records we're trying to read. |
| 857 | */ |
| 858 | return TRY_REC_EOF; |
| 859 | } |
| 860 | if (*err == WTAP_ERR_SHORT_READ-12) { |
| 861 | /* |
| 862 | * Short read; this might be a corrupt |
| 863 | * file in this format or might not be |
| 864 | * in this format. Return a figure of |
| 865 | * merit of 1 more than what we've |
| 866 | * accumulated so far, to note the |
| 867 | * short read in addition to any other |
| 868 | * issues we've found. |
| 869 | */ |
| 870 | *figure_of_meritp += 1; |
| 871 | return TRY_REC_EOF; |
| 872 | } |
| 873 | /* Hard error. */ |
| 874 | return TRY_REC_ERROR; |
| 875 | } |
| 876 | |
| 877 | if (libpcap->byte_swapped) { |
| 878 | /* Byte-swap the field. */ |
| 879 | hdr.ts_sec = GUINT32_SWAP_LE_BE(hdr.ts_sec)(((guint32) ( (((guint32) (hdr.ts_sec) & (guint32) 0x000000ffU ) << 24) | (((guint32) (hdr.ts_sec) & (guint32) 0x0000ff00U ) << 8) | (((guint32) (hdr.ts_sec) & (guint32) 0x00ff0000U ) >> 8) | (((guint32) (hdr.ts_sec) & (guint32) 0xff000000U ) >> 24)))); |
| 880 | } |
| 881 | |
| 882 | if (!wtap_read_bytes(wth->fh, &hdr.ts_usec, 4, err, err_info)) { |
| 883 | if (*err == WTAP_ERR_SHORT_READ-12) { |
| 884 | /* |
| 885 | * Short read; this might be a corrupt |
| 886 | * file in this format or might not be |
| 887 | * in this format. Return a figure of |
| 888 | * merit of 1 more than what we've |
| 889 | * accumulated so far, to note the |
| 890 | * short read in addition to any other |
| 891 | * issues we've found. |
| 892 | */ |
| 893 | *figure_of_meritp += 1; |
| 894 | return TRY_REC_EOF; |
| 895 | } |
| 896 | /* Hard error. */ |
| 897 | return TRY_REC_ERROR; |
| 898 | } |
| 899 | |
| 900 | if (libpcap->byte_swapped) { |
| 901 | /* Byte-swap the field. */ |
| 902 | hdr.ts_usec = GUINT32_SWAP_LE_BE(hdr.ts_usec)(((guint32) ( (((guint32) (hdr.ts_usec) & (guint32) 0x000000ffU ) << 24) | (((guint32) (hdr.ts_usec) & (guint32) 0x0000ff00U ) << 8) | (((guint32) (hdr.ts_usec) & (guint32) 0x00ff0000U ) >> 8) | (((guint32) (hdr.ts_usec) & (guint32) 0xff000000U ) >> 24)))); |
| 903 | } |
| 904 | |
| 905 | /* |
| 906 | * The only file types for which we have to do variant |
| 907 | * determination by looking at packets have microsecond |
| 908 | * resolution; treat fractions-of-a-second values >= 1 000 000 |
| 909 | * as an indication that the header format might not be |
| 910 | * what we think it is. |
| 911 | */ |
| 912 | if (hdr.ts_usec >= 1000000) |
| 913 | *figure_of_meritp += 1; |
| 914 | |
| 915 | if (!wtap_read_bytes(wth->fh, &hdr.incl_len, 4, err, err_info)) { |
| 916 | if (*err == WTAP_ERR_SHORT_READ-12) { |
| 917 | /* |
| 918 | * Short read; this might be a corrupt |
| 919 | * file in this format or might not be |
| 920 | * in this format. Return a figure of |
| 921 | * merit of 1 more than what we've |
| 922 | * accumulated so far, to note the |
| 923 | * short read in addition to any other |
| 924 | * issues we've found. |
| 925 | */ |
| 926 | *figure_of_meritp += 1; |
| 927 | return TRY_REC_EOF; |
| 928 | } |
| 929 | /* Hard error. */ |
| 930 | return TRY_REC_ERROR; |
| 931 | } |
| 932 | |
| 933 | if (libpcap->byte_swapped) { |
| 934 | /* Byte-swap the field. */ |
| 935 | hdr.incl_len = GUINT32_SWAP_LE_BE(hdr.incl_len)(((guint32) ( (((guint32) (hdr.incl_len) & (guint32) 0x000000ffU ) << 24) | (((guint32) (hdr.incl_len) & (guint32) 0x0000ff00U ) << 8) | (((guint32) (hdr.incl_len) & (guint32) 0x00ff0000U ) >> 8) | (((guint32) (hdr.incl_len) & (guint32) 0xff000000U ) >> 24)))); |
| 936 | } |
| 937 | |
| 938 | if (hdr.incl_len > wtap_max_snaplen_for_encap(wth->file_encap)) { |
| 939 | /* |
| 940 | * Probably either a corrupt capture file or a file |
| 941 | * of a type different from the one we're trying. |
| 942 | */ |
| 943 | incl_len_ok = false0; |
| 944 | *figure_of_meritp += 1; |
| 945 | } |
| 946 | |
| 947 | if (hdr.incl_len > wth->snapshot_length) { |
| 948 | /* |
| 949 | * This is not a fatal error, and packets that have one |
| 950 | * such packet probably have thousands. For discussion, |
| 951 | * see |
| 952 | * https://lists.wireshark.org/archives/wireshark-dev/201307/msg00076.html |
| 953 | * and related messages. |
| 954 | * |
| 955 | * The packet contents will be copied to a Buffer, which |
| 956 | * expands as necessary to hold the contents; we don't have |
| 957 | * to worry about fixed-length buffers allocated based on |
| 958 | * the original snapshot length. |
| 959 | * |
| 960 | * We just treat this as an indication that we might be |
| 961 | * trying the wrong file type here. |
| 962 | */ |
| 963 | *figure_of_meritp += 1; |
| 964 | } |
| 965 | |
| 966 | if (!wtap_read_bytes(wth->fh, &hdr.orig_len, 4, err, err_info)) { |
| 967 | if (*err == WTAP_ERR_SHORT_READ-12) { |
| 968 | /* |
| 969 | * Short read; this might be a corrupt |
| 970 | * file in this format or might not be |
| 971 | * in this format. Return a figure of |
| 972 | * merit of 1 more than what we've |
| 973 | * accumulated so far, to note the |
| 974 | * short read in addition to any other |
| 975 | * issues we've found. |
| 976 | */ |
| 977 | *figure_of_meritp += 1; |
| 978 | return TRY_REC_EOF; |
| 979 | } |
| 980 | /* Hard error. */ |
| 981 | return TRY_REC_ERROR; |
| 982 | } |
| 983 | |
| 984 | if (libpcap->byte_swapped) { |
| 985 | /* Byte-swap the field. */ |
| 986 | hdr.orig_len = GUINT32_SWAP_LE_BE(hdr.orig_len)(((guint32) ( (((guint32) (hdr.orig_len) & (guint32) 0x000000ffU ) << 24) | (((guint32) (hdr.orig_len) & (guint32) 0x0000ff00U ) << 8) | (((guint32) (hdr.orig_len) & (guint32) 0x00ff0000U ) >> 8) | (((guint32) (hdr.orig_len) & (guint32) 0xff000000U ) >> 24)))); |
| 987 | } |
| 988 | |
| 989 | if (hdr.orig_len > 128*1024*1024) { |
| 990 | /* |
| 991 | * In theory I guess the on-the-wire packet size can be |
| 992 | * arbitrarily large, and it can certainly be larger than the |
| 993 | * maximum snapshot length which bounds the snapshot size, |
| 994 | * but any file claiming 128MB in a single packet is *probably* |
| 995 | * corrupt, and treating them as such makes the heuristics |
| 996 | * much more reliable. See, for example, |
| 997 | * |
| 998 | * https://gitlab.com/wireshark/wireshark/-/issues/9634 |
| 999 | * |
| 1000 | * (128MB is an arbitrary size at this point, chosen to be |
| 1001 | * large enough for the largest D-Bus packet). |
| 1002 | */ |
| 1003 | *figure_of_meritp += 1; |
| 1004 | } |
| 1005 | |
| 1006 | if (hdr.incl_len > hdr.orig_len) { |
| 1007 | /* |
| 1008 | * Another hint that this might be the wrong file type. |
| 1009 | */ |
| 1010 | *figure_of_meritp += 1; |
| 1011 | } |
| 1012 | |
| 1013 | /* |
| 1014 | * Now check any additional fields that the variant we're |
| 1015 | * trying has. |
| 1016 | */ |
| 1017 | switch (variant) { |
| 1018 | |
| 1019 | case PCAP: |
| 1020 | case PCAP_AIX: |
| 1021 | case PCAP_NSEC: |
| 1022 | /* No more fields. */ |
| 1023 | break; |
| 1024 | |
| 1025 | case PCAP_SS990417: |
| 1026 | case PCAP_SS991029: |
| 1027 | case PCAP_SS990915: |
| 1028 | /* struct pcaprec_modified_hdr */ |
| 1029 | |
| 1030 | /* 32-bit interface index. */ |
| 1031 | if (!wtap_read_bytes(wth->fh, &ifindex, 4, err, err_info)) { |
| 1032 | if (*err == WTAP_ERR_SHORT_READ-12) { |
| 1033 | /* |
| 1034 | * Short read; this might be a corrupt |
| 1035 | * file in this format or might not be |
| 1036 | * in this format. Return a figure of |
| 1037 | * merit of 1 more than what we've |
| 1038 | * accumulated so far, to note the |
| 1039 | * short read in addition to any other |
| 1040 | * issues we've found. |
| 1041 | */ |
| 1042 | *figure_of_meritp += 1; |
| 1043 | return TRY_REC_EOF; |
| 1044 | } |
| 1045 | /* Hard error. */ |
| 1046 | return TRY_REC_ERROR; |
| 1047 | } |
| 1048 | |
| 1049 | if (libpcap->byte_swapped) { |
| 1050 | /* Byte-swap the field. */ |
| 1051 | ifindex = GUINT32_SWAP_LE_BE(ifindex)(((guint32) ( (((guint32) (ifindex) & (guint32) 0x000000ffU ) << 24) | (((guint32) (ifindex) & (guint32) 0x0000ff00U ) << 8) | (((guint32) (ifindex) & (guint32) 0x00ff0000U ) >> 8) | (((guint32) (ifindex) & (guint32) 0xff000000U ) >> 24)))); |
| 1052 | } |
| 1053 | |
| 1054 | /* |
| 1055 | * Make sure it's not too large; those files date |
| 1056 | * from an era when a Linux box probably didn't |
| 1057 | * have more than 10000 interfaces, so check for |
| 1058 | * a value >= 10000. |
| 1059 | */ |
| 1060 | if (ifindex > 10000) |
| 1061 | *figure_of_meritp += 1; |
| 1062 | |
| 1063 | /* |
| 1064 | * 16-bit "Ethernet packet type", which is either an |
| 1065 | * Ethertype or one of the internal Linux ETH_P_ |
| 1066 | * values from linux/if_ether.h. |
| 1067 | */ |
| 1068 | if (!wtap_read_bytes(wth->fh, &protocol, 2, err, err_info)) { |
| 1069 | if (*err == WTAP_ERR_SHORT_READ-12) { |
| 1070 | /* |
| 1071 | * Short read; this might be a corrupt |
| 1072 | * file in this format or might not be |
| 1073 | * in this format. Return a figure of |
| 1074 | * merit of 1 more than what we've |
| 1075 | * accumulated so far, to note the |
| 1076 | * short read in addition to any other |
| 1077 | * issues we've found. |
| 1078 | */ |
| 1079 | *figure_of_meritp += 1; |
| 1080 | return TRY_REC_EOF; |
| 1081 | } |
| 1082 | /* Hard error. */ |
| 1083 | return TRY_REC_ERROR; |
| 1084 | } |
| 1085 | |
| 1086 | if (libpcap->byte_swapped) { |
| 1087 | /* Byte-swap the field. */ |
| 1088 | protocol = GUINT16_SWAP_LE_BE(protocol)(((guint16) ( (guint16) ((guint16) (protocol) >> 8) | ( guint16) ((guint16) (protocol) << 8)))); |
| 1089 | } |
| 1090 | |
| 1091 | /* |
| 1092 | * Valid values are: |
| 1093 | * |
| 1094 | * anything >= 0x0600 (normal Ethertype range) |
| 1095 | * 0x0060 (ETH_P_LOOP) |
| 1096 | * 0x0200 (ETH_P_ECHO) |
| 1097 | * 0x0400 (ETH_P_PUP) |
| 1098 | * 0x0000 (see in some such captures) |
| 1099 | * 0x0001 to 0x0017 ("Non DIX types") |
| 1100 | */ |
| 1101 | if (!(protocol >= 0x0600 || |
| 1102 | protocol == 0x0060 || |
| 1103 | protocol == 0x0200 || |
| 1104 | protocol == 0x0400 || |
| 1105 | protocol == 0x0000 || |
| 1106 | (protocol >= 0x0001 && protocol <= 0x0017))) |
| 1107 | *figure_of_meritp += 1; |
| 1108 | |
| 1109 | /* |
| 1110 | * 8-bit packet type - one of the Linux PACKET_ |
| 1111 | * types from linux/if_packet.h. The ones that |
| 1112 | * would appear in files from the era in which |
| 1113 | * these formats existed (the patches that |
| 1114 | * introduced them from are from 1999) are in |
| 1115 | * the range 0 through 4; anything else is treated |
| 1116 | * as a sign that this is unlikely to be in that |
| 1117 | * format. |
| 1118 | */ |
| 1119 | if (!wtap_read_bytes(wth->fh, &pkt_type, 1, err, err_info)) { |
| 1120 | if (*err == WTAP_ERR_SHORT_READ-12) { |
| 1121 | /* |
| 1122 | * Short read; this might be a corrupt |
| 1123 | * file in this format or might not be |
| 1124 | * in this format. Return a figure of |
| 1125 | * merit of 1 more than what we've |
| 1126 | * accumulated so far, to note the |
| 1127 | * short read in addition to any other |
| 1128 | * issues we've found. |
| 1129 | */ |
| 1130 | *figure_of_meritp += 1; |
| 1131 | return TRY_REC_EOF; |
| 1132 | } |
| 1133 | /* Hard error. */ |
| 1134 | return TRY_REC_ERROR; |
| 1135 | } |
| 1136 | |
| 1137 | if (pkt_type > 4) |
| 1138 | *figure_of_meritp += 1; |
| 1139 | |
| 1140 | if (variant == PCAP_SS990915) { |
| 1141 | /* |
| 1142 | * 2 8-bit values that are filled in only |
| 1143 | * if libpcap is built with SMP debugging, |
| 1144 | * fllowed by 3 bytes of 8-bit padding, |
| 1145 | * not guaranteed to be zero. |
| 1146 | * |
| 1147 | * Just skip them. |
| 1148 | */ |
| 1149 | if (!wtap_read_bytes(wth->fh, NULL((void*)0), 5, err, err_info)) { |
| 1150 | if (*err == WTAP_ERR_SHORT_READ-12) { |
| 1151 | /* |
| 1152 | * Short read; this might be a corrupt |
| 1153 | * file in this format or might not be |
| 1154 | * in this format. Return a figure of |
| 1155 | * merit of 1 more than what we've |
| 1156 | * accumulated so far, to note the |
| 1157 | * short read in addition to any other |
| 1158 | * issues we've found. |
| 1159 | */ |
| 1160 | *figure_of_meritp += 1; |
| 1161 | return TRY_REC_EOF; |
| 1162 | } |
| 1163 | /* Hard error. */ |
| 1164 | return TRY_REC_ERROR; |
| 1165 | } |
| 1166 | } else { |
| 1167 | /* |
| 1168 | * 8-bit structure padding, not guaranteed to be |
| 1169 | * zero. |
| 1170 | */ |
| 1171 | if (!wtap_read_bytes(wth->fh, NULL((void*)0), 1, err, err_info)) { |
| 1172 | if (*err == WTAP_ERR_SHORT_READ-12) { |
| 1173 | /* |
| 1174 | * Short read; this might be a corrupt |
| 1175 | * file in this format or might not be |
| 1176 | * in this format. Return a figure of |
| 1177 | * merit of 1 more than what we've |
| 1178 | * accumulated so far, to note the |
| 1179 | * short read in addition to any other |
| 1180 | * issues we've found. |
| 1181 | */ |
| 1182 | *figure_of_meritp += 1; |
| 1183 | return TRY_REC_EOF; |
| 1184 | } |
| 1185 | /* Hard error. */ |
| 1186 | return TRY_REC_ERROR; |
| 1187 | } |
| 1188 | } |
| 1189 | break; |
| 1190 | |
| 1191 | case PCAP_NOKIA: |
| 1192 | /* |
| 1193 | * pcaprec_nokia_hdr. |
| 1194 | * |
| 1195 | * 4 bytes of unknown stuff. |
| 1196 | */ |
| 1197 | if (!wtap_read_bytes(wth->fh, &nokia_stuff, 4, err, err_info)) { |
| 1198 | if (*err == WTAP_ERR_SHORT_READ-12) { |
| 1199 | /* |
| 1200 | * Short read; this might be a corrupt |
| 1201 | * file in this format or might not be |
| 1202 | * in this format. Return a figure of |
| 1203 | * merit of 1 more than what we've |
| 1204 | * accumulated so far, to note the |
| 1205 | * short read in addition to any other |
| 1206 | * issues we've found. |
| 1207 | */ |
| 1208 | *figure_of_meritp += 1; |
| 1209 | return TRY_REC_EOF; |
| 1210 | } |
| 1211 | /* Hard error. */ |
| 1212 | return TRY_REC_ERROR; |
| 1213 | } |
| 1214 | |
| 1215 | /* |
| 1216 | * Values we've seen in this field are of the form |
| 1217 | * |
| 1218 | * 0xXfbfYZ0W |
| 1219 | * |
| 1220 | * where X is either 9/1001 or b/1011, Y is either b/1011 |
| 1221 | * or d/1101, Z is either 6/0110 or 9/1001, and W is either |
| 1222 | * 1/0001 or 2/0010. |
| 1223 | * |
| 1224 | * Check for those values. |
| 1225 | */ |
| 1226 | #define NOKIA_STUFF_CONSTANT(ns)((ns) & 0x0FFF00F0) ((ns) & 0x0FFF00F0) |
| 1227 | #define NOKIA_STUFF_PART_1(ns)((ns) & 0xF0000000) ((ns) & 0xF0000000) |
| 1228 | #define NOKIA_STUFF_PART_2(ns)((ns) & 0x0000F000) ((ns) & 0x0000F000) |
| 1229 | #define NOKIA_STUFF_PART_3(ns)((ns) & 0x00000F00) ((ns) & 0x00000F00) |
| 1230 | #define NOKIA_STUFF_PART_4(ns)((ns) & 0x0000000F) ((ns) & 0x0000000F) |
| 1231 | if (!(NOKIA_STUFF_CONSTANT(nokia_stuff)((nokia_stuff) & 0x0FFF00F0) == 0x0fbf0000 && |
| 1232 | (NOKIA_STUFF_PART_1(nokia_stuff)((nokia_stuff) & 0xF0000000) == 0x90000000 || |
| 1233 | NOKIA_STUFF_PART_1(nokia_stuff)((nokia_stuff) & 0xF0000000) == 0xb0000000) && |
| 1234 | (NOKIA_STUFF_PART_2(nokia_stuff)((nokia_stuff) & 0x0000F000) == 0x0000b000 || |
| 1235 | NOKIA_STUFF_PART_2(nokia_stuff)((nokia_stuff) & 0x0000F000) == 0x0000d000) && |
| 1236 | (NOKIA_STUFF_PART_3(nokia_stuff)((nokia_stuff) & 0x00000F00) == 0x00000600 || |
| 1237 | NOKIA_STUFF_PART_3(nokia_stuff)((nokia_stuff) & 0x00000F00) == 0x00000900) && |
| 1238 | (NOKIA_STUFF_PART_4(nokia_stuff)((nokia_stuff) & 0x0000000F) == 0x00000001 || |
| 1239 | NOKIA_STUFF_PART_4(nokia_stuff)((nokia_stuff) & 0x0000000F) == 0x00000002))) |
| 1240 | *figure_of_meritp += 1; |
| 1241 | break; |
| 1242 | |
| 1243 | default: |
| 1244 | ws_assert_not_reached()ws_log_fatal_full("", LOG_LEVEL_ERROR, "wiretap/libpcap.c", 1244 , __func__, "assertion \"not reached\" failed"); |
| 1245 | } |
| 1246 | |
| 1247 | if (!incl_len_ok) { |
| 1248 | /* |
| 1249 | * Might be the wrong file type; stop trying, and give |
| 1250 | * this as the figure of merit for this file type. |
| 1251 | */ |
| 1252 | return TRY_REC_EOF; |
| 1253 | } |
| 1254 | |
| 1255 | /* |
| 1256 | * Now skip over the record's data, under the assumption that |
| 1257 | * the header is sane. |
| 1258 | */ |
| 1259 | if (!wtap_read_bytes(wth->fh, NULL((void*)0), hdr.incl_len, err, err_info)) { |
| 1260 | if (*err == WTAP_ERR_SHORT_READ-12) { |
| 1261 | /* |
| 1262 | * Short read; this might be a corrupt |
| 1263 | * file in this format or might not be |
| 1264 | * in this format. Return a figure of |
| 1265 | * merit of 1 more than what we've |
| 1266 | * accumulated so far, to note the |
| 1267 | * short read in addition to any other |
| 1268 | * issues we've found. |
| 1269 | */ |
| 1270 | *figure_of_meritp += 1; |
| 1271 | return TRY_REC_EOF; |
| 1272 | } |
| 1273 | /* Hard error. */ |
| 1274 | return TRY_REC_ERROR; |
| 1275 | } |
| 1276 | |
| 1277 | return TRY_REC_KEEP_READING; |
| 1278 | } |
| 1279 | |
| 1280 | /* Read the next packet */ |
| 1281 | static bool_Bool libpcap_read(wtap *wth, wtap_rec *rec, Buffer *buf, |
| 1282 | int *err, char **err_info, int64_t *data_offset) |
| 1283 | { |
| 1284 | *data_offset = file_tell(wth->fh); |
| 1285 | |
| 1286 | return libpcap_read_packet(wth, wth->fh, rec, buf, err, err_info); |
| 1287 | } |
| 1288 | |
| 1289 | static bool_Bool |
| 1290 | libpcap_seek_read(wtap *wth, int64_t seek_off, wtap_rec *rec, |
| 1291 | Buffer *buf, int *err, char **err_info) |
| 1292 | { |
| 1293 | if (file_seek(wth->random_fh, seek_off, SEEK_SET0, err) == -1) |
| 1294 | return false0; |
| 1295 | |
| 1296 | if (!libpcap_read_packet(wth, wth->random_fh, rec, buf, err, |
| 1297 | err_info)) { |
| 1298 | if (*err == 0) |
| 1299 | *err = WTAP_ERR_SHORT_READ-12; |
| 1300 | return false0; |
| 1301 | } |
| 1302 | return true1; |
| 1303 | } |
| 1304 | |
| 1305 | static bool_Bool |
| 1306 | libpcap_read_packet(wtap *wth, FILE_T fh, wtap_rec *rec, |
| 1307 | Buffer *buf, int *err, char **err_info) |
| 1308 | { |
| 1309 | struct pcaprec_ss990915_hdr hdr; |
| 1310 | unsigned packet_size; |
| 1311 | unsigned orig_size; |
| 1312 | int phdr_len; |
| 1313 | libpcap_t *libpcap = (libpcap_t *)wth->priv; |
| 1314 | bool_Bool is_nokia; |
| 1315 | |
| 1316 | if (!libpcap_read_header(wth, fh, err, err_info, &hdr)) |
| 1317 | return false0; |
| 1318 | |
| 1319 | if (hdr.hdr.incl_len > wtap_max_snaplen_for_encap(wth->file_encap)) { |
| 1320 | /* |
| 1321 | * Probably a corrupt capture file; return an error, |
| 1322 | * so that our caller doesn't blow up trying to allocate |
| 1323 | * space for an immensely-large packet. |
| 1324 | */ |
| 1325 | *err = WTAP_ERR_BAD_FILE-13; |
| 1326 | if (err_info != NULL((void*)0)) { |
| 1327 | *err_info = ws_strdup_printf("pcap: File has %u-byte packet, bigger than maximum of %u",wmem_strdup_printf(((void*)0), "pcap: File has %u-byte packet, bigger than maximum of %u" , hdr.hdr.incl_len, wtap_max_snaplen_for_encap(wth->file_encap )) |
| 1328 | hdr.hdr.incl_len,wmem_strdup_printf(((void*)0), "pcap: File has %u-byte packet, bigger than maximum of %u" , hdr.hdr.incl_len, wtap_max_snaplen_for_encap(wth->file_encap )) |
| 1329 | wtap_max_snaplen_for_encap(wth->file_encap))wmem_strdup_printf(((void*)0), "pcap: File has %u-byte packet, bigger than maximum of %u" , hdr.hdr.incl_len, wtap_max_snaplen_for_encap(wth->file_encap )); |
| 1330 | } |
| 1331 | return false0; |
| 1332 | } |
| 1333 | |
| 1334 | packet_size = hdr.hdr.incl_len; |
| 1335 | orig_size = hdr.hdr.orig_len; |
| 1336 | |
| 1337 | /* |
| 1338 | * AIX appears to put 3 bytes of padding in front of FDDI |
| 1339 | * frames; strip that crap off. |
| 1340 | */ |
| 1341 | if (libpcap->variant == PCAP_AIX && |
| 1342 | (wth->file_encap == WTAP_ENCAP_FDDI5 || |
| 1343 | wth->file_encap == WTAP_ENCAP_FDDI_BITSWAPPED6)) { |
| 1344 | /* |
| 1345 | * The packet size is really a record size and includes |
| 1346 | * the padding. |
| 1347 | */ |
| 1348 | packet_size -= 3; |
| 1349 | orig_size -= 3; |
| 1350 | |
| 1351 | /* |
| 1352 | * Skip the padding. |
| 1353 | */ |
| 1354 | if (!wtap_read_bytes(fh, NULL((void*)0), 3, err, err_info)) |
| 1355 | return false0; |
| 1356 | } |
| 1357 | |
| 1358 | is_nokia = (libpcap->variant == PCAP_NOKIA); |
| 1359 | phdr_len = pcap_process_pseudo_header(fh, is_nokia, |
| 1360 | wth->file_encap, packet_size, rec, err, err_info); |
| 1361 | if (phdr_len < 0) |
| 1362 | return false0; /* error */ |
| 1363 | |
| 1364 | /* |
| 1365 | * Don't count any pseudo-header as part of the packet. |
| 1366 | */ |
| 1367 | orig_size -= phdr_len; |
| 1368 | packet_size -= phdr_len; |
| 1369 | |
| 1370 | rec->rec_type = REC_TYPE_PACKET0; |
| 1371 | rec->block = wtap_block_create(WTAP_BLOCK_PACKET); |
| 1372 | rec->presence_flags = WTAP_HAS_TS0x00000001|WTAP_HAS_CAP_LEN0x00000002; |
| 1373 | |
| 1374 | /* Update the timestamp, if not already done */ |
| 1375 | if (wth->file_encap != WTAP_ENCAP_ERF98) { |
| 1376 | rec->ts.secs = hdr.hdr.ts_sec; |
| 1377 | if (libpcap->variant == PCAP_NSEC || |
| 1378 | libpcap->variant == PCAP_AIX) |
| 1379 | rec->ts.nsecs = hdr.hdr.ts_usec; |
| 1380 | else |
| 1381 | rec->ts.nsecs = hdr.hdr.ts_usec * 1000; |
| 1382 | } else { |
| 1383 | int interface_id; |
| 1384 | /* Set interface ID for ERF format */ |
| 1385 | rec->presence_flags |= WTAP_HAS_INTERFACE_ID0x00000004; |
| 1386 | if ((interface_id = erf_populate_interface_from_header((erf_t*) libpcap->encap_priv, wth, &rec->rec_header.packet_header.pseudo_header, err, err_info)) < 0) |
| 1387 | return false0; |
| 1388 | |
| 1389 | rec->rec_header.packet_header.interface_id = (unsigned) interface_id; |
| 1390 | } |
| 1391 | rec->rec_header.packet_header.caplen = packet_size; |
| 1392 | rec->rec_header.packet_header.len = orig_size; |
| 1393 | |
| 1394 | /* |
| 1395 | * Read the packet data. |
| 1396 | */ |
| 1397 | if (!wtap_read_packet_bytes(fh, buf, packet_size, err, err_info)) |
| 1398 | return false0; /* failed */ |
| 1399 | |
| 1400 | pcap_read_post_process(is_nokia, wth->file_encap, rec, |
| 1401 | ws_buffer_start_ptr(buf)((buf)->data + (buf)->start), libpcap->byte_swapped, libpcap->fcs_len); |
| 1402 | return true1; |
| 1403 | } |
| 1404 | |
| 1405 | /* Read the header of the next packet. |
| 1406 | |
| 1407 | Return false on an error, true on success. */ |
| 1408 | static bool_Bool |
| 1409 | libpcap_read_header(wtap *wth, FILE_T fh, int *err, char **err_info, |
| 1410 | struct pcaprec_ss990915_hdr *hdr) |
| 1411 | { |
| 1412 | int bytes_to_read; |
| 1413 | uint32_t temp; |
| 1414 | libpcap_t *libpcap = (libpcap_t *)wth->priv; |
| 1415 | |
| 1416 | switch (libpcap->variant) { |
| 1417 | |
| 1418 | case PCAP: |
| 1419 | case PCAP_AIX: |
| 1420 | case PCAP_NSEC: |
| 1421 | bytes_to_read = sizeof (struct pcaprec_hdr); |
| 1422 | break; |
| 1423 | |
| 1424 | case PCAP_SS990417: |
| 1425 | case PCAP_SS991029: |
| 1426 | bytes_to_read = sizeof (struct pcaprec_modified_hdr); |
| 1427 | break; |
| 1428 | |
| 1429 | case PCAP_SS990915: |
| 1430 | bytes_to_read = sizeof (struct pcaprec_ss990915_hdr); |
| 1431 | break; |
| 1432 | |
| 1433 | case PCAP_NOKIA: |
| 1434 | bytes_to_read = sizeof (struct pcaprec_nokia_hdr); |
| 1435 | break; |
| 1436 | |
| 1437 | default: |
| 1438 | bytes_to_read = 0; |
Value stored to 'bytes_to_read' is never read | |
| 1439 | ws_assert_not_reached()ws_log_fatal_full("", LOG_LEVEL_ERROR, "wiretap/libpcap.c", 1439 , __func__, "assertion \"not reached\" failed"); |
| 1440 | } |
| 1441 | if (!wtap_read_bytes_or_eof(fh, hdr, bytes_to_read, err, err_info)) |
| 1442 | return false0; |
| 1443 | |
| 1444 | if (libpcap->byte_swapped) { |
| 1445 | /* Byte-swap the record header fields. */ |
| 1446 | hdr->hdr.ts_sec = GUINT32_SWAP_LE_BE(hdr->hdr.ts_sec)(((guint32) ( (((guint32) (hdr->hdr.ts_sec) & (guint32 ) 0x000000ffU) << 24) | (((guint32) (hdr->hdr.ts_sec ) & (guint32) 0x0000ff00U) << 8) | (((guint32) (hdr ->hdr.ts_sec) & (guint32) 0x00ff0000U) >> 8) | ( ((guint32) (hdr->hdr.ts_sec) & (guint32) 0xff000000U) >> 24)))); |
| 1447 | hdr->hdr.ts_usec = GUINT32_SWAP_LE_BE(hdr->hdr.ts_usec)(((guint32) ( (((guint32) (hdr->hdr.ts_usec) & (guint32 ) 0x000000ffU) << 24) | (((guint32) (hdr->hdr.ts_usec ) & (guint32) 0x0000ff00U) << 8) | (((guint32) (hdr ->hdr.ts_usec) & (guint32) 0x00ff0000U) >> 8) | ( ((guint32) (hdr->hdr.ts_usec) & (guint32) 0xff000000U) >> 24)))); |
| 1448 | hdr->hdr.incl_len = GUINT32_SWAP_LE_BE(hdr->hdr.incl_len)(((guint32) ( (((guint32) (hdr->hdr.incl_len) & (guint32 ) 0x000000ffU) << 24) | (((guint32) (hdr->hdr.incl_len ) & (guint32) 0x0000ff00U) << 8) | (((guint32) (hdr ->hdr.incl_len) & (guint32) 0x00ff0000U) >> 8) | (((guint32) (hdr->hdr.incl_len) & (guint32) 0xff000000U ) >> 24)))); |
| 1449 | hdr->hdr.orig_len = GUINT32_SWAP_LE_BE(hdr->hdr.orig_len)(((guint32) ( (((guint32) (hdr->hdr.orig_len) & (guint32 ) 0x000000ffU) << 24) | (((guint32) (hdr->hdr.orig_len ) & (guint32) 0x0000ff00U) << 8) | (((guint32) (hdr ->hdr.orig_len) & (guint32) 0x00ff0000U) >> 8) | (((guint32) (hdr->hdr.orig_len) & (guint32) 0xff000000U ) >> 24)))); |
| 1450 | } |
| 1451 | |
| 1452 | /* Swap the "incl_len" and "orig_len" fields, if necessary. */ |
| 1453 | switch (libpcap->lengths_swapped) { |
| 1454 | |
| 1455 | case NOT_SWAPPED: |
| 1456 | break; |
| 1457 | |
| 1458 | case MAYBE_SWAPPED: |
| 1459 | if (hdr->hdr.incl_len <= hdr->hdr.orig_len) { |
| 1460 | /* |
| 1461 | * The captured length is <= the actual length, |
| 1462 | * so presumably they weren't swapped. |
| 1463 | */ |
| 1464 | break; |
| 1465 | } |
| 1466 | /* FALLTHROUGH */ |
| 1467 | |
| 1468 | case SWAPPED: |
| 1469 | temp = hdr->hdr.orig_len; |
| 1470 | hdr->hdr.orig_len = hdr->hdr.incl_len; |
| 1471 | hdr->hdr.incl_len = temp; |
| 1472 | break; |
| 1473 | } |
| 1474 | |
| 1475 | return true1; |
| 1476 | } |
| 1477 | |
| 1478 | /* Returns 0 if we could write the specified encapsulation type, |
| 1479 | an error indication otherwise. */ |
| 1480 | static int libpcap_dump_can_write_encap(int encap) |
| 1481 | { |
| 1482 | /* Per-packet encapsulations aren't supported. */ |
| 1483 | if (encap == WTAP_ENCAP_PER_PACKET-1) |
| 1484 | return WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED-9; |
| 1485 | |
| 1486 | if (wtap_wtap_encap_to_pcap_encap(encap) == -1) |
| 1487 | return WTAP_ERR_UNWRITABLE_ENCAP-8; |
| 1488 | |
| 1489 | return 0; |
| 1490 | } |
| 1491 | |
| 1492 | static bool_Bool libpcap_dump_write_file_header(wtap_dumper *wdh, uint32_t magic, |
| 1493 | int *err) |
| 1494 | { |
| 1495 | struct pcap_hdr file_hdr; |
| 1496 | |
| 1497 | if (!wtap_dump_file_write(wdh, &magic, sizeof magic, err)) |
| 1498 | return false0; |
| 1499 | |
| 1500 | /* current "libpcap" format is 2.4 */ |
| 1501 | file_hdr.version_major = 2; |
| 1502 | file_hdr.version_minor = 4; |
| 1503 | file_hdr.thiszone = 0; /* XXX - current offset? */ |
| 1504 | file_hdr.sigfigs = 0; /* unknown, but also apparently unused */ |
| 1505 | /* |
| 1506 | * Tcpdump cannot handle capture files with a snapshot length of 0, |
| 1507 | * as BPF filters return either 0 if they fail or the snapshot length |
| 1508 | * if they succeed, and a snapshot length of 0 means success is |
| 1509 | * indistinguishable from failure and the filter expression would |
| 1510 | * reject all packets. |
| 1511 | * |
| 1512 | * A snapshot length of 0, inside Wiretap, means "snapshot length |
| 1513 | * unknown"; if the snapshot length supplied to us is 0, we make |
| 1514 | * the snapshot length in the header file the maximum for the |
| 1515 | * link-layer type we'll be writing. |
| 1516 | */ |
| 1517 | file_hdr.snaplen = (wdh->snaplen != 0) ? (unsigned)wdh->snaplen : |
| 1518 | wtap_max_snaplen_for_encap(wdh->file_encap); |
| 1519 | file_hdr.network = wtap_wtap_encap_to_pcap_encap(wdh->file_encap); |
| 1520 | if (!wtap_dump_file_write(wdh, &file_hdr, sizeof file_hdr, err)) |
| 1521 | return false0; |
| 1522 | |
| 1523 | return true1; |
| 1524 | } |
| 1525 | |
| 1526 | /* Good old fashioned pcap. |
| 1527 | Returns true on success, false on failure; sets "*err" to an error code on |
| 1528 | failure */ |
| 1529 | static bool_Bool |
| 1530 | libpcap_dump_open_pcap(wtap_dumper *wdh, int *err, char **err_info _U___attribute__((unused))) |
| 1531 | { |
| 1532 | /* This is a libpcap file */ |
| 1533 | wdh->subtype_write = libpcap_dump_pcap; |
| 1534 | |
| 1535 | /* Write the file header. */ |
| 1536 | return libpcap_dump_write_file_header(wdh, PCAP_MAGIC0xa1b2c3d4, err); |
| 1537 | } |
| 1538 | |
| 1539 | /* Like classic pcap, but with nanosecond resolution. |
| 1540 | Returns true on success, false on failure; sets "*err" to an error code on |
| 1541 | failure */ |
| 1542 | static bool_Bool |
| 1543 | libpcap_dump_open_pcap_nsec(wtap_dumper *wdh, int *err, char **err_info _U___attribute__((unused))) |
| 1544 | { |
| 1545 | /* This is a nanosecond-resolution libpcap file */ |
| 1546 | wdh->subtype_write = libpcap_dump_pcap_nsec; |
| 1547 | |
| 1548 | /* Write the file header. */ |
| 1549 | return libpcap_dump_write_file_header(wdh, PCAP_NSEC_MAGIC0xa1b23c4d, err); |
| 1550 | } |
| 1551 | |
| 1552 | /* Modified, but with the old magic, sigh. |
| 1553 | Returns true on success, false on failure; sets "*err" to an error code on |
| 1554 | failure */ |
| 1555 | static bool_Bool |
| 1556 | libpcap_dump_open_pcap_ss990417(wtap_dumper *wdh, int *err, |
| 1557 | char **err_info _U___attribute__((unused))) |
| 1558 | { |
| 1559 | /* This is a modified-by-patch-SS990417 libpcap file */ |
| 1560 | wdh->subtype_write = libpcap_dump_pcap_ss990417; |
| 1561 | |
| 1562 | /* Write the file header. */ |
| 1563 | return libpcap_dump_write_file_header(wdh, PCAP_MAGIC0xa1b2c3d4, err); |
| 1564 | } |
| 1565 | |
| 1566 | /* New magic, extra crap. |
| 1567 | Returns true on success, false on failure; sets "*err" to an error code on |
| 1568 | failure */ |
| 1569 | static bool_Bool |
| 1570 | libpcap_dump_open_pcap_ss990915(wtap_dumper *wdh, int *err, |
| 1571 | char **err_info _U___attribute__((unused))) |
| 1572 | { |
| 1573 | /* This is a modified-by-patch-SS990915 libpcap file */ |
| 1574 | wdh->subtype_write = libpcap_dump_pcap_ss990915; |
| 1575 | |
| 1576 | /* Write the file header. */ |
| 1577 | return libpcap_dump_write_file_header(wdh, PCAP_MODIFIED_MAGIC0xa1b2cd34, err); |
| 1578 | } |
| 1579 | |
| 1580 | /* Same magic as SS990915, *different* extra crap, sigh. |
| 1581 | Returns true on success, false on failure; sets "*err" to an error code on |
| 1582 | failure */ |
| 1583 | static bool_Bool |
| 1584 | libpcap_dump_open_pcap_ss991029(wtap_dumper *wdh, int *err, |
| 1585 | char **err_info _U___attribute__((unused))) |
| 1586 | { |
| 1587 | /* This is a modified-by-patch-SS991029 libpcap file */ |
| 1588 | wdh->subtype_write = libpcap_dump_pcap_ss991029; |
| 1589 | |
| 1590 | /* Write the file header. */ |
| 1591 | return libpcap_dump_write_file_header(wdh, PCAP_MODIFIED_MAGIC0xa1b2cd34, err); |
| 1592 | } |
| 1593 | |
| 1594 | static void libpcap_close(wtap *wth) |
| 1595 | { |
| 1596 | libpcap_t *libpcap = (libpcap_t *)wth->priv; |
| 1597 | |
| 1598 | if (libpcap->encap_priv) { |
| 1599 | switch (wth->file_encap) { |
| 1600 | |
| 1601 | case WTAP_ENCAP_ERF98: |
| 1602 | erf_priv_free((erf_t*) libpcap->encap_priv); |
| 1603 | break; |
| 1604 | |
| 1605 | default: |
| 1606 | g_free(libpcap->encap_priv); |
| 1607 | break; |
| 1608 | } |
| 1609 | } |
| 1610 | } |
| 1611 | |
| 1612 | /* Nokia libpcap of some sort. |
| 1613 | Returns true on success, false on failure; sets "*err" to an error code on |
| 1614 | failure */ |
| 1615 | static bool_Bool |
| 1616 | libpcap_dump_open_pcap_nokia(wtap_dumper *wdh, int *err, char **err_info _U___attribute__((unused))) |
| 1617 | { |
| 1618 | /* This is a Nokia libpcap file */ |
| 1619 | wdh->subtype_write = libpcap_dump_pcap_nokia; |
| 1620 | |
| 1621 | /* Write the file header. */ |
| 1622 | return libpcap_dump_write_file_header(wdh, PCAP_MAGIC0xa1b2c3d4, err); |
| 1623 | } |
| 1624 | |
| 1625 | static bool_Bool |
| 1626 | libpcap_dump_write_packet(wtap_dumper *wdh, const wtap_rec *rec, |
| 1627 | struct pcaprec_hdr *hdr, size_t hdr_size, const uint8_t *pd, int *err) |
| 1628 | { |
| 1629 | const union wtap_pseudo_header *pseudo_header = &rec->rec_header.packet_header.pseudo_header; |
| 1630 | int phdrsize; |
| 1631 | |
| 1632 | phdrsize = pcap_get_phdr_size(wdh->file_encap, pseudo_header); |
| 1633 | |
| 1634 | /* We can only write packet records. */ |
| 1635 | if (rec->rec_type != REC_TYPE_PACKET0) { |
| 1636 | *err = WTAP_ERR_UNWRITABLE_REC_TYPE-24; |
| 1637 | return false0; |
| 1638 | } |
| 1639 | |
| 1640 | /* |
| 1641 | * Make sure this packet doesn't have a link-layer type that |
| 1642 | * differs from the one for the file. |
| 1643 | */ |
| 1644 | if (wdh->file_encap != rec->rec_header.packet_header.pkt_encap) { |
| 1645 | *err = WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED-9; |
| 1646 | return false0; |
| 1647 | } |
| 1648 | |
| 1649 | /* |
| 1650 | * Don't write anything we're not willing to read. |
| 1651 | * (The cast is to prevent an overflow.) |
| 1652 | */ |
| 1653 | if ((uint64_t)rec->rec_header.packet_header.caplen + phdrsize > wtap_max_snaplen_for_encap(wdh->file_encap)) { |
| 1654 | *err = WTAP_ERR_PACKET_TOO_LARGE-22; |
| 1655 | return false0; |
| 1656 | } |
| 1657 | |
| 1658 | hdr->incl_len = rec->rec_header.packet_header.caplen + phdrsize; |
| 1659 | hdr->orig_len = rec->rec_header.packet_header.len + phdrsize; |
| 1660 | |
| 1661 | if (!wtap_dump_file_write(wdh, hdr, hdr_size, err)) |
| 1662 | return false0; |
| 1663 | |
| 1664 | if (!pcap_write_phdr(wdh, wdh->file_encap, pseudo_header, err)) |
| 1665 | return false0; |
| 1666 | |
| 1667 | if (!wtap_dump_file_write(wdh, pd, rec->rec_header.packet_header.caplen, err)) |
| 1668 | return false0; |
| 1669 | return true1; |
| 1670 | } |
| 1671 | |
| 1672 | /* Good old fashioned pcap. |
| 1673 | Write a record for a packet to a dump file. |
| 1674 | Returns true on success, false on failure. */ |
| 1675 | static bool_Bool |
| 1676 | libpcap_dump_pcap(wtap_dumper *wdh, const wtap_rec *rec, const uint8_t *pd, |
| 1677 | int *err, char **err_info _U___attribute__((unused))) |
| 1678 | { |
| 1679 | struct pcaprec_hdr rec_hdr; |
| 1680 | |
| 1681 | /* |
| 1682 | * Some code that reads libpcap files may handle time |
| 1683 | * stamps as unsigned, but most of it probably handles |
| 1684 | * them as signed. |
| 1685 | */ |
| 1686 | if (rec->ts.secs < 0 || rec->ts.secs > INT32_MAX(2147483647)) { |
| 1687 | *err = WTAP_ERR_TIME_STAMP_NOT_SUPPORTED-27; |
| 1688 | return false0; |
| 1689 | } |
| 1690 | rec_hdr.ts_sec = (uint32_t) rec->ts.secs; |
| 1691 | rec_hdr.ts_usec = rec->ts.nsecs / 1000; |
| 1692 | return libpcap_dump_write_packet(wdh, rec, &rec_hdr, sizeof rec_hdr, |
| 1693 | pd, err); |
| 1694 | } |
| 1695 | |
| 1696 | /* Like classic pcap, but with nanosecond resolution. |
| 1697 | Write a record for a packet to a dump file. |
| 1698 | Returns true on success, false on failure. */ |
| 1699 | static bool_Bool |
| 1700 | libpcap_dump_pcap_nsec(wtap_dumper *wdh, const wtap_rec *rec, const uint8_t *pd, |
| 1701 | int *err, char **err_info _U___attribute__((unused))) |
| 1702 | { |
| 1703 | struct pcaprec_hdr rec_hdr; |
| 1704 | |
| 1705 | /* |
| 1706 | * Some code that reads libpcap files may handle time |
| 1707 | * stamps as unsigned, but most of it probably handles |
| 1708 | * them as signed. |
| 1709 | */ |
| 1710 | if (rec->ts.secs < 0 || rec->ts.secs > INT32_MAX(2147483647)) { |
| 1711 | *err = WTAP_ERR_TIME_STAMP_NOT_SUPPORTED-27; |
| 1712 | return false0; |
| 1713 | } |
| 1714 | rec_hdr.ts_sec = (uint32_t) rec->ts.secs; |
| 1715 | rec_hdr.ts_usec = rec->ts.nsecs; |
| 1716 | return libpcap_dump_write_packet(wdh, rec, &rec_hdr, sizeof rec_hdr, |
| 1717 | pd, err); |
| 1718 | } |
| 1719 | |
| 1720 | /* Modified, but with the old magic, sigh. |
| 1721 | Write a record for a packet to a dump file. |
| 1722 | Returns true on success, false on failure. */ |
| 1723 | static bool_Bool |
| 1724 | libpcap_dump_pcap_ss990417(wtap_dumper *wdh, const wtap_rec *rec, |
| 1725 | const uint8_t *pd, int *err, char **err_info _U___attribute__((unused))) |
| 1726 | { |
| 1727 | struct pcaprec_modified_hdr rec_hdr; |
| 1728 | |
| 1729 | /* |
| 1730 | * Some code that reads libpcap files may handle time |
| 1731 | * stamps as unsigned, but most of it probably handles |
| 1732 | * them as signed. |
| 1733 | */ |
| 1734 | if (rec->ts.secs < 0 || rec->ts.secs > INT32_MAX(2147483647)) { |
| 1735 | *err = WTAP_ERR_TIME_STAMP_NOT_SUPPORTED-27; |
| 1736 | return false0; |
| 1737 | } |
| 1738 | rec_hdr.hdr.ts_sec = (uint32_t) rec->ts.secs; |
| 1739 | rec_hdr.hdr.ts_usec = rec->ts.nsecs / 1000; |
| 1740 | /* XXX - what should we supply here? |
| 1741 | |
| 1742 | Alexey's "libpcap" looks up the interface in the system's |
| 1743 | interface list if "ifindex" is non-zero, and prints |
| 1744 | the interface name. It ignores "protocol", and uses |
| 1745 | "pkt_type" to tag the packet as "host", "broadcast", |
| 1746 | "multicast", "other host", "outgoing", or "none of the |
| 1747 | above", but that's it. |
| 1748 | |
| 1749 | If the capture we're writing isn't a modified or |
| 1750 | RH 6.1 capture, we'd have to do some work to |
| 1751 | generate the packet type and interface index - and |
| 1752 | we can't generate the interface index unless we |
| 1753 | just did the capture ourselves in any case. |
| 1754 | |
| 1755 | I'm inclined to continue to punt; systems other than |
| 1756 | those with the older patch can read standard "libpcap" |
| 1757 | files, and systems with the older patch, e.g. RH 6.1, |
| 1758 | will just have to live with this. */ |
| 1759 | rec_hdr.ifindex = 0; |
| 1760 | rec_hdr.protocol = 0; |
| 1761 | rec_hdr.pkt_type = 0; |
| 1762 | return libpcap_dump_write_packet(wdh, rec, &rec_hdr.hdr, sizeof rec_hdr, |
| 1763 | pd, err); |
| 1764 | } |
| 1765 | |
| 1766 | /* New magic, extra crap. |
| 1767 | Write a record for a packet to a dump file. |
| 1768 | Returns true on success, false on failure. */ |
| 1769 | static bool_Bool |
| 1770 | libpcap_dump_pcap_ss990915(wtap_dumper *wdh, const wtap_rec *rec, |
| 1771 | const uint8_t *pd, int *err, char **err_info _U___attribute__((unused))) |
| 1772 | { |
| 1773 | struct pcaprec_ss990915_hdr rec_hdr; |
| 1774 | |
| 1775 | /* |
| 1776 | * Some code that reads libpcap files may handle time |
| 1777 | * stamps as unsigned, but most of it probably handles |
| 1778 | * them as signed. |
| 1779 | */ |
| 1780 | if (rec->ts.secs < 0 || rec->ts.secs > INT32_MAX(2147483647)) { |
| 1781 | *err = WTAP_ERR_TIME_STAMP_NOT_SUPPORTED-27; |
| 1782 | return false0; |
| 1783 | } |
| 1784 | rec_hdr.hdr.ts_sec = (uint32_t) rec->ts.secs; |
| 1785 | rec_hdr.hdr.ts_usec = rec->ts.nsecs / 1000; |
| 1786 | rec_hdr.ifindex = 0; |
| 1787 | rec_hdr.protocol = 0; |
| 1788 | rec_hdr.pkt_type = 0; |
| 1789 | rec_hdr.cpu1 = 0; |
| 1790 | rec_hdr.cpu2 = 0; |
| 1791 | return libpcap_dump_write_packet(wdh, rec, &rec_hdr.hdr, sizeof rec_hdr, |
| 1792 | pd, err); |
| 1793 | } |
| 1794 | |
| 1795 | /* Same magic as SS990915, *different* extra crap, sigh. |
| 1796 | Write a record for a packet to a dump file. |
| 1797 | Returns true on success, false on failure. */ |
| 1798 | static bool_Bool |
| 1799 | libpcap_dump_pcap_ss991029(wtap_dumper *wdh, const wtap_rec *rec, |
| 1800 | const uint8_t *pd, int *err, char **err_info _U___attribute__((unused))) |
| 1801 | { |
| 1802 | struct pcaprec_modified_hdr rec_hdr; |
| 1803 | |
| 1804 | /* |
| 1805 | * Some code that reads libpcap files may handle time |
| 1806 | * stamps as unsigned, but most of it probably handles |
| 1807 | * them as signed. |
| 1808 | */ |
| 1809 | if (rec->ts.secs < 0 || rec->ts.secs > INT32_MAX(2147483647)) { |
| 1810 | *err = WTAP_ERR_TIME_STAMP_NOT_SUPPORTED-27; |
| 1811 | return false0; |
| 1812 | } |
| 1813 | rec_hdr.hdr.ts_sec = (uint32_t) rec->ts.secs; |
| 1814 | rec_hdr.hdr.ts_usec = rec->ts.nsecs / 1000; |
| 1815 | /* XXX - what should we supply here? |
| 1816 | |
| 1817 | Alexey's "libpcap" looks up the interface in the system's |
| 1818 | interface list if "ifindex" is non-zero, and prints |
| 1819 | the interface name. It ignores "protocol", and uses |
| 1820 | "pkt_type" to tag the packet as "host", "broadcast", |
| 1821 | "multicast", "other host", "outgoing", or "none of the |
| 1822 | above", but that's it. |
| 1823 | |
| 1824 | If the capture we're writing isn't a modified or |
| 1825 | RH 6.1 capture, we'd have to do some work to |
| 1826 | generate the packet type and interface index - and |
| 1827 | we can't generate the interface index unless we |
| 1828 | just did the capture ourselves in any case. |
| 1829 | |
| 1830 | I'm inclined to continue to punt; systems other than |
| 1831 | those with the older patch can read standard "libpcap" |
| 1832 | files, and systems with the older patch, e.g. RH 6.1, |
| 1833 | will just have to live with this. */ |
| 1834 | rec_hdr.ifindex = 0; |
| 1835 | rec_hdr.protocol = 0; |
| 1836 | rec_hdr.pkt_type = 0; |
| 1837 | return libpcap_dump_write_packet(wdh, rec, &rec_hdr.hdr, sizeof rec_hdr, |
| 1838 | pd, err); |
| 1839 | } |
| 1840 | |
| 1841 | /* Nokia libpcap of some sort. |
| 1842 | Write a record for a packet to a dump file. |
| 1843 | Returns true on success, false on failure. */ |
| 1844 | static bool_Bool |
| 1845 | libpcap_dump_pcap_nokia(wtap_dumper *wdh, const wtap_rec *rec, |
| 1846 | const uint8_t *pd, int *err, char **err_info _U___attribute__((unused))) |
| 1847 | { |
| 1848 | struct pcaprec_nokia_hdr rec_hdr; |
| 1849 | const union wtap_pseudo_header *pseudo_header = &rec->rec_header.packet_header.pseudo_header; |
| 1850 | |
| 1851 | /* |
| 1852 | * Some code that reads libpcap files may handle time |
| 1853 | * stamps as unsigned, but most of it probably handles |
| 1854 | * them as signed. |
| 1855 | */ |
| 1856 | if (rec->ts.secs < 0 || rec->ts.secs > INT32_MAX(2147483647)) { |
| 1857 | *err = WTAP_ERR_TIME_STAMP_NOT_SUPPORTED-27; |
| 1858 | return false0; |
| 1859 | } |
| 1860 | rec_hdr.hdr.ts_sec = (uint32_t) rec->ts.secs; |
| 1861 | rec_hdr.hdr.ts_usec = rec->ts.nsecs / 1000; |
| 1862 | /* restore the "mysterious stuff" that came with the packet */ |
| 1863 | memcpy(rec_hdr.stuff, pseudo_header->nokia.stuff, 4); |
| 1864 | return libpcap_dump_write_packet(wdh, rec, &rec_hdr.hdr, sizeof rec_hdr, |
| 1865 | pd, err); |
| 1866 | } |
| 1867 | |
| 1868 | static const struct supported_block_type pcap_blocks_supported[] = { |
| 1869 | /* |
| 1870 | * We support packet blocks, with no comments or other options. |
| 1871 | */ |
| 1872 | { WTAP_BLOCK_PACKET, MULTIPLE_BLOCKS_SUPPORTED, NO_OPTIONS_SUPPORTED0, ((void*)0) } |
| 1873 | }; |
| 1874 | |
| 1875 | static const struct file_type_subtype_info pcap_info = { |
| 1876 | /* Gianluca Varenni suggests that we add "deprecated" to the description. */ |
| 1877 | "Wireshark/tcpdump/... - pcap", "pcap", "pcap", "cap;dmp", |
| 1878 | false0, BLOCKS_SUPPORTED(pcap_blocks_supported)(sizeof (pcap_blocks_supported) / sizeof (pcap_blocks_supported )[0]), pcap_blocks_supported, |
| 1879 | libpcap_dump_can_write_encap, libpcap_dump_open_pcap, NULL((void*)0) |
| 1880 | }; |
| 1881 | |
| 1882 | static const struct file_type_subtype_info pcap_nsec_info = { |
| 1883 | "Wireshark/tcpdump/... - nanosecond pcap", "nsecpcap", "pcap", "cap;dmp", |
| 1884 | false0, BLOCKS_SUPPORTED(pcap_blocks_supported)(sizeof (pcap_blocks_supported) / sizeof (pcap_blocks_supported )[0]), pcap_blocks_supported, |
| 1885 | libpcap_dump_can_write_encap, libpcap_dump_open_pcap_nsec, NULL((void*)0) |
| 1886 | }; |
| 1887 | |
| 1888 | static const struct file_type_subtype_info pcap_aix_info = { |
| 1889 | "AIX tcpdump - pcap", "aixpcap", "pcap", "cap;dmp", |
| 1890 | false0, BLOCKS_SUPPORTED(pcap_blocks_supported)(sizeof (pcap_blocks_supported) / sizeof (pcap_blocks_supported )[0]), pcap_blocks_supported, |
| 1891 | NULL((void*)0), NULL((void*)0), NULL((void*)0) |
| 1892 | }; |
| 1893 | |
| 1894 | static const struct file_type_subtype_info pcap_ss990417_info = { |
| 1895 | "RedHat 6.1 tcpdump - pcap", "rh6_1pcap", "pcap", "cap;dmp", |
| 1896 | false0, BLOCKS_SUPPORTED(pcap_blocks_supported)(sizeof (pcap_blocks_supported) / sizeof (pcap_blocks_supported )[0]), pcap_blocks_supported, |
| 1897 | libpcap_dump_can_write_encap, libpcap_dump_open_pcap_ss990417, NULL((void*)0) |
| 1898 | }; |
| 1899 | |
| 1900 | static const struct file_type_subtype_info pcap_ss990915_info = { |
| 1901 | "SuSE 6.3 tcpdump - pcap", "suse6_3pcap", "pcap", "cap;dmp", |
| 1902 | false0, BLOCKS_SUPPORTED(pcap_blocks_supported)(sizeof (pcap_blocks_supported) / sizeof (pcap_blocks_supported )[0]), pcap_blocks_supported, |
| 1903 | libpcap_dump_can_write_encap, libpcap_dump_open_pcap_ss990915, NULL((void*)0) |
| 1904 | }; |
| 1905 | |
| 1906 | static const struct file_type_subtype_info pcap_ss991029_info = { |
| 1907 | "Modified tcpdump - pcap", "modpcap", "pcap", "cap;dmp", |
| 1908 | false0, BLOCKS_SUPPORTED(pcap_blocks_supported)(sizeof (pcap_blocks_supported) / sizeof (pcap_blocks_supported )[0]), pcap_blocks_supported, |
| 1909 | libpcap_dump_can_write_encap, libpcap_dump_open_pcap_ss991029, NULL((void*)0) |
| 1910 | }; |
| 1911 | |
| 1912 | static const struct file_type_subtype_info pcap_nokia_info = { |
| 1913 | "Nokia tcpdump - pcap", "nokiapcap", "pcap", "cap;dmp", |
| 1914 | false0, BLOCKS_SUPPORTED(pcap_blocks_supported)(sizeof (pcap_blocks_supported) / sizeof (pcap_blocks_supported )[0]), pcap_blocks_supported, |
| 1915 | libpcap_dump_can_write_encap, libpcap_dump_open_pcap_nokia, NULL((void*)0) |
| 1916 | }; |
| 1917 | |
| 1918 | void register_pcap(void) |
| 1919 | { |
| 1920 | pcap_file_type_subtype = wtap_register_file_type_subtype(&pcap_info); |
| 1921 | pcap_nsec_file_type_subtype = wtap_register_file_type_subtype(&pcap_nsec_info); |
| 1922 | pcap_aix_file_type_subtype = wtap_register_file_type_subtype(&pcap_aix_info); |
| 1923 | pcap_ss990417_file_type_subtype = wtap_register_file_type_subtype(&pcap_ss990417_info); |
| 1924 | pcap_ss990915_file_type_subtype = wtap_register_file_type_subtype(&pcap_ss990915_info); |
| 1925 | pcap_ss991029_file_type_subtype = wtap_register_file_type_subtype(&pcap_ss991029_info); |
| 1926 | pcap_nokia_file_type_subtype = wtap_register_file_type_subtype(&pcap_nokia_info); |
| 1927 | |
| 1928 | /* |
| 1929 | * We now call the libpcap file format just pcap, but we allow |
| 1930 | * the various variants of it to be specified using names |
| 1931 | * containing "libpcap" as well as "pcap", for backwards |
| 1932 | * compatibility. |
| 1933 | * |
| 1934 | * Register names for that purpose. |
| 1935 | */ |
| 1936 | wtap_register_compatibility_file_subtype_name("libpcap", "pcap"); |
| 1937 | wtap_register_compatibility_file_subtype_name("nseclibpcap", "nsecpcap"); |
| 1938 | wtap_register_compatibility_file_subtype_name("aixlibpcap", "aixpcap"); |
| 1939 | wtap_register_compatibility_file_subtype_name("modlibpcap", "modpcap"); |
| 1940 | wtap_register_compatibility_file_subtype_name("nokialibpcap", "nokiapcap"); |
| 1941 | wtap_register_compatibility_file_subtype_name("rh6_1libpcap", "rh6_1pcap"); |
| 1942 | wtap_register_compatibility_file_subtype_name("suse6_3libpcap", "suse6_3pcap"); |
| 1943 | |
| 1944 | /* |
| 1945 | * Register names for backwards compatibility with the |
| 1946 | * wtap_filetypes table in Lua. |
| 1947 | */ |
| 1948 | wtap_register_backwards_compatibility_lua_name("PCAP", |
| 1949 | pcap_file_type_subtype); |
| 1950 | wtap_register_backwards_compatibility_lua_name("PCAP_NSEC", |
| 1951 | pcap_nsec_file_type_subtype); |
| 1952 | wtap_register_backwards_compatibility_lua_name("PCAP_AIX", |
| 1953 | pcap_aix_file_type_subtype); |
| 1954 | wtap_register_backwards_compatibility_lua_name("PCAP_SS990417", |
| 1955 | pcap_ss990417_file_type_subtype); |
| 1956 | wtap_register_backwards_compatibility_lua_name("PCAP_SS990915", |
| 1957 | pcap_ss990915_file_type_subtype); |
| 1958 | wtap_register_backwards_compatibility_lua_name("PCAP_SS991029", |
| 1959 | pcap_ss991029_file_type_subtype); |
| 1960 | wtap_register_backwards_compatibility_lua_name("PCAP_NOKIA", |
| 1961 | pcap_nokia_file_type_subtype); |
| 1962 | } |
| 1963 | |
| 1964 | /* |
| 1965 | * Editor modelines - https://www.wireshark.org/tools/modelines.html |
| 1966 | * |
| 1967 | * Local variables: |
| 1968 | * c-basic-offset: 8 |
| 1969 | * tab-width: 8 |
| 1970 | * indent-tabs-mode: t |
| 1971 | * End: |
| 1972 | * |
| 1973 | * vi: set shiftwidth=8 tabstop=8 noexpandtab: |
| 1974 | * :indentSize=8:tabSize=8:noTabs=false: |
| 1975 | */ |