nexmon – Rev 1
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/* pcapng.c
*
* Wiretap Library
* Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
*
* File format support for pcap-ng file format
* Copyright (c) 2007 by Ulf Lamping <ulf.lamping@web.de>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/* File format specification:
* https://github.com/pcapng/pcapng
* Related Wiki page:
* https://wiki.wireshark.org/Development/PcapNg
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "wtap-int.h"
#include "file_wrappers.h"
#include "pcap-common.h"
#include "pcap-encap.h"
#include "pcapng.h"
#include "pcapng_module.h"
#if 0
#define pcapng_debug(...) g_warning(__VA_ARGS__)
#else
#define pcapng_debug(...)
#endif
static gboolean
pcapng_read(wtap *wth, int *err, gchar **err_info,
gint64 *data_offset);
static gboolean
pcapng_seek_read(wtap *wth, gint64 seek_off,
struct wtap_pkthdr *phdr, Buffer *buf, int *err, gchar **err_info);
static void
pcapng_close(wtap *wth);
/*
* Minimum block size = size of block header + size of block trailer.
*/
#define MIN_BLOCK_SIZE ((guint32)(sizeof(pcapng_block_header_t) + sizeof(guint32)))
/*
* In order to keep from trying to allocate large chunks of memory,
* which could either fail or, even if it succeeds, chew up so much
* address space or memory+backing store as not to leave room for
* anything else, we impose an upper limit on the size of blocks
* we're willing to handle.
*
* For now, we pick an arbitrary limit of 16MB (OK, fine, 16MiB, but
* don't try saying that on Wikipedia :-) :-) :-)).
*/
#define MAX_BLOCK_SIZE (16*1024*1024)
/*
* Minimum SHB size = minimum block size + size of fixed length portion of SHB.
*/
#define MIN_SHB_SIZE ((guint32)(MIN_BLOCK_SIZE + sizeof(pcapng_section_header_block_t)))
/* pcapng: packet block file encoding (obsolete) */
typedef struct pcapng_packet_block_s {
guint16 interface_id;
guint16 drops_count;
guint32 timestamp_high;
guint32 timestamp_low;
guint32 captured_len;
guint32 packet_len;
/* ... Packet Data ... */
/* ... Padding ... */
/* ... Options ... */
} pcapng_packet_block_t;
/*
* Minimum PB size = minimum block size + size of fixed length portion of PB.
*/
#define MIN_PB_SIZE ((guint32)(MIN_BLOCK_SIZE + sizeof(pcapng_packet_block_t)))
/* pcapng: enhanced packet block file encoding */
typedef struct pcapng_enhanced_packet_block_s {
guint32 interface_id;
guint32 timestamp_high;
guint32 timestamp_low;
guint32 captured_len;
guint32 packet_len;
/* ... Packet Data ... */
/* ... Padding ... */
/* ... Options ... */
} pcapng_enhanced_packet_block_t;
/*
* Minimum EPB size = minimum block size + size of fixed length portion of EPB.
*/
#define MIN_EPB_SIZE ((guint32)(MIN_BLOCK_SIZE + sizeof(pcapng_enhanced_packet_block_t)))
/* pcapng: simple packet block file encoding */
typedef struct pcapng_simple_packet_block_s {
guint32 packet_len;
/* ... Packet Data ... */
/* ... Padding ... */
} pcapng_simple_packet_block_t;
/*
* Minimum SPB size = minimum block size + size of fixed length portion of SPB.
*/
#define MIN_SPB_SIZE ((guint32)(MIN_BLOCK_SIZE + sizeof(pcapng_simple_packet_block_t)))
/* pcapng: name resolution block file encoding */
typedef struct pcapng_name_resolution_block_s {
guint16 record_type;
guint16 record_len;
/* ... Record ... */
} pcapng_name_resolution_block_t;
/*
* Minimum NRB size = minimum block size + size of smallest NRB record
* (there must at least be an "end of records" record).
*/
#define MIN_NRB_SIZE ((guint32)(MIN_BLOCK_SIZE + sizeof(pcapng_name_resolution_block_t)))
/*
* Minimum ISB size = minimum block size + size of fixed length portion of ISB.
*/
#define MIN_ISB_SIZE ((guint32)(MIN_BLOCK_SIZE + sizeof(pcapng_interface_statistics_block_t)))
/*
* Minimum Sysdig size = minimum block size + packed size of sysdig_event_phdr.
*/
#define SYSDIG_EVENT_HEADER_SIZE ((16 + 64 + 64 + 32 + 16)/8) /* CPU ID + TS + TID + Event len + Event type */
#define MIN_SYSDIG_EVENT_SIZE ((guint32)(MIN_BLOCK_SIZE + SYSDIG_EVENT_HEADER_SIZE))
/* pcapng: common option header file encoding for every option type */
typedef struct pcapng_option_header_s {
guint16 option_code;
guint16 option_length;
/* ... x bytes Option Body ... */
/* ... Padding ... */
} pcapng_option_header_t;
struct option {
guint16 type;
guint16 value_length;
};
/* Option codes: 16-bit field */
#define OPT_EPB_FLAGS 0x0002
#define OPT_EPB_HASH 0x0003
#define OPT_EPB_DROPCOUNT 0x0004
#define OPT_NRB_DNSNAME 0x0002
#define OPT_NRB_DNSV4ADDR 0x0003
#define OPT_NRB_DNSV6ADDR 0x0004
/* MSBit of option code means "local type" */
#define OPT_LOCAL_FLAG 0x8000
/* Note: many of the defined structures for block data are defined in wtap.h */
/* Packet data - used for both Enhanced Packet Block and the obsolete Packet Block data */
typedef struct wtapng_packet_s {
/* mandatory */
guint32 ts_high; /* seconds since 1.1.1970 */
guint32 ts_low; /* fraction of seconds, depends on if_tsresol */
guint32 cap_len; /* data length in the file */
guint32 packet_len; /* data length on the wire */
guint32 interface_id; /* identifier of the interface. */
guint16 drops_count; /* drops count, only valid for packet block */
/* 0xffff if information no available */
/* pack_hash */
/* XXX - put the packet data / pseudo_header here as well? */
} wtapng_packet_t;
/* Simple Packet data */
typedef struct wtapng_simple_packet_s {
/* mandatory */
guint32 cap_len; /* data length in the file */
guint32 packet_len; /* data length on the wire */
/* XXX - put the packet data / pseudo_header here as well? */
} wtapng_simple_packet_t;
/* Block data to be passed between functions during reading */
typedef struct wtapng_block_s {
guint32 type; /* block_type as defined by pcapng */
wtap_block_t block;
/*
* XXX - currently don't know how to handle these!
*
* For one thing, when we're reading a block, they must be
* writable, i.e. not const, so that we can read into them,
* but, when we're writing a block, they can be const, and,
* in fact, they sometimes point to const values.
*/
struct wtap_pkthdr *packet_header;
Buffer *frame_buffer;
} wtapng_block_t;
/* Interface data in private struct */
typedef struct interface_info_s {
int wtap_encap;
guint32 snap_len;
guint64 time_units_per_second;
int tsprecision;
} interface_info_t;
typedef struct {
gboolean shb_read; /**< Set when first SHB read */
gboolean byte_swapped;
guint16 version_major;
guint16 version_minor;
GArray *interfaces; /**< Interfaces found in the capture file. */
gint8 if_fcslen;
wtap_new_ipv4_callback_t add_new_ipv4;
wtap_new_ipv6_callback_t add_new_ipv6;
} pcapng_t;
#ifdef HAVE_PLUGINS
/*
* Table for plugins to handle particular block types.
*
* A handler has a "read" routine and a "write" routine.
*
* A "read" routine returns a block as a libwiretap record, filling
* in the wtap_pkthdr structure with the appropriate record type and
* other information, and filling in the supplied Buffer with
* data for which there's no place in the wtap_pkthdr structure.
*
* A "write" routine takes a libwiretap record and Buffer and writes
* out a block.
*/
typedef struct {
block_reader reader;
block_writer writer;
} block_handler;
static GHashTable *block_handlers;
void
register_pcapng_block_type_handler(guint block_type, block_reader reader,
block_writer writer)
{
block_handler *handler;
if (block_handlers == NULL) {
/*
* Create the table of block handlers.
*
* XXX - there's no "g_uint_hash()" or "g_uint_equal()",
* so we use "g_direct_hash()" and "g_direct_equal()".
*/
block_handlers = g_hash_table_new_full(g_direct_hash,
g_direct_equal,
NULL, g_free);
}
handler = g_new(block_handler, 1);
handler->reader = reader;
handler->writer = writer;
g_hash_table_insert(block_handlers, GUINT_TO_POINTER(block_type),
handler);
}
/*
* Tables for plugins to handle particular options for particular block
* types.
*
* An option has a handler routine, which is passed an indication of
* whether this section of the file is byte-swapped, the length of the
* option, the data of the option, a pointer to an error code, and a
* pointer to a pointer variable for an error string.
*
* It checks whether the length and option are valid, and, if they aren't,
* returns FALSE, setting the error code to the appropriate error (normally
* WTAP_ERR_BAD_FILE) and the error string to an appropriate string
* indicating the problem.
*
* Otherwise, if this section of the file is byte-swapped, it byte-swaps
* multi-byte numerical values, so that it's in the host byte order.
*/
/*
* Block types indices in the table of tables of option handlers.
*
* Block types are not guaranteed to be sequential, so we map the
* block types we support to a sequential set. Furthermore, all
* packet block types have the same set of options.
*/
#define BT_INDEX_SHB 0
#define BT_INDEX_IDB 1
#define BT_INDEX_PBS 2 /* all packet blocks */
#define BT_INDEX_NRB 3
#define BT_INDEX_ISB 4
#define BT_INDEX_EVT 5
#define NUM_BT_INDICES 6
typedef struct {
option_handler_fn hfunc;
} option_handler;
static GHashTable *option_handlers[NUM_BT_INDICES];
static gboolean
get_block_type_index(guint block_type, guint *bt_index)
{
g_assert(bt_index);
switch (block_type) {
case BLOCK_TYPE_SHB:
*bt_index = BT_INDEX_SHB;
break;
case BLOCK_TYPE_IDB:
*bt_index = BT_INDEX_IDB;
break;
case BLOCK_TYPE_PB:
case BLOCK_TYPE_EPB:
case BLOCK_TYPE_SPB:
*bt_index = BT_INDEX_PBS;
break;
case BLOCK_TYPE_NRB:
*bt_index = BT_INDEX_NRB;
break;
case BLOCK_TYPE_ISB:
*bt_index = BT_INDEX_ISB;
break;
case BLOCK_TYPE_SYSDIG_EVENT:
/* case BLOCK_TYPE_SYSDIG_EVF: */
*bt_index = BT_INDEX_EVT;
break;
default:
/*
* This is a block type we don't process; either we ignore it,
* in which case the options don't get processed, or there's
* a plugin routine to handle it, in which case that routine
* will do the option processing itself.
*
* XXX - report an error?
*/
return FALSE;
}
return TRUE;
}
void
register_pcapng_option_handler(guint block_type, guint option_code,
option_handler_fn hfunc)
{
guint bt_index;
option_handler *handler;
if (!get_block_type_index(block_type, &bt_index))
return;
if (option_handlers[bt_index] == NULL) {
/*
* Create the table of option handlers for this block type.
*
* XXX - there's no "g_uint_hash()" or "g_uint_equal()",
* so we use "g_direct_hash()" and "g_direct_equal()".
*/
option_handlers[bt_index] = g_hash_table_new_full(g_direct_hash,
g_direct_equal,
NULL, g_free);
}
handler = g_new(option_handler, 1);
handler->hfunc = hfunc;
g_hash_table_insert(option_handlers[bt_index],
GUINT_TO_POINTER(option_code), handler);
}
#endif /* HAVE_PLUGINS */
static int
pcapng_read_option(FILE_T fh, pcapng_t *pn, pcapng_option_header_t *oh,
guint8 *content, guint len, guint to_read,
int *err, gchar **err_info, gchar* block_name)
{
int block_read;
/* sanity check: don't run past the end of the block */
if (to_read < sizeof (*oh)) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_option: Not enough data to read header of the %s block",
block_name);
return -1;
}
/* read option header */
if (!wtap_read_bytes(fh, oh, sizeof (*oh), err, err_info)) {
pcapng_debug("pcapng_read_option: failed to read option");
return -1;
}
block_read = sizeof (*oh);
if (pn->byte_swapped) {
oh->option_code = GUINT16_SWAP_LE_BE(oh->option_code);
oh->option_length = GUINT16_SWAP_LE_BE(oh->option_length);
}
/* sanity check: don't run past the end of the block */
if (to_read < sizeof (*oh) + oh->option_length) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_option: Not enough data to handle option length (%d) of the %s block",
oh->option_length, block_name);
return -1;
}
/* sanity check: option length */
if (len < oh->option_length) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_option: option length (%d) to long for %s block",
len, block_name);
return -1;
}
/* read option content */
if (!wtap_read_bytes(fh, content, oh->option_length, err, err_info)) {
pcapng_debug("pcapng_read_option: failed to read content of option %u", oh->option_code);
return -1;
}
block_read += oh->option_length;
/* jump over potential padding bytes at end of option */
if ( (oh->option_length % 4) != 0) {
if (!file_skip(fh, 4 - (oh->option_length % 4), err))
return -1;
block_read += 4 - (oh->option_length % 4);
}
return block_read;
}
typedef enum {
PCAPNG_BLOCK_OK,
PCAPNG_BLOCK_NOT_SHB,
PCAPNG_BLOCK_ERROR
} block_return_val;
static block_return_val
pcapng_read_section_header_block(FILE_T fh, pcapng_block_header_t *bh,
pcapng_t *pn, wtapng_block_t *wblock,
int *err, gchar **err_info)
{
int bytes_read;
gboolean byte_swapped;
guint16 version_major;
guint16 version_minor;
guint to_read, opt_cont_buf_len;
pcapng_section_header_block_t shb;
pcapng_option_header_t oh;
wtapng_mandatory_section_t* section_data;
gchar* tmp_content;
guint8 *option_content = NULL; /* Allocate as large as the options block */
/* read fixed-length part of the block */
if (!wtap_read_bytes(fh, &shb, sizeof shb, err, err_info)) {
if (*err == WTAP_ERR_SHORT_READ) {
/*
* This block is too short to be an SHB.
*
* If we're reading this as part of an open,
* the file is too short to be a pcap-ng file.
*
* If we're not, we treat PCAPNG_BLOCK_NOT_SHB and
* PCAPNG_BLOCK_ERROR the same, so we can just return
* PCAPNG_BLOCK_NOT_SHB in both cases.
*/
return PCAPNG_BLOCK_NOT_SHB;
}
return PCAPNG_BLOCK_ERROR;
}
/* is the magic number one we expect? */
switch (shb.magic) {
case(0x1A2B3C4D):
/* this seems pcapng with correct byte order */
byte_swapped = FALSE;
version_major = shb.version_major;
version_minor = shb.version_minor;
pcapng_debug("pcapng_read_section_header_block: SHB (our byte order) V%u.%u, len %u",
version_major, version_minor, bh->block_total_length);
break;
case(0x4D3C2B1A):
/* this seems pcapng with swapped byte order */
byte_swapped = TRUE;
version_major = GUINT16_SWAP_LE_BE(shb.version_major);
version_minor = GUINT16_SWAP_LE_BE(shb.version_minor);
/* tweak the block length to meet current swapping that we know now */
bh->block_total_length = GUINT32_SWAP_LE_BE(bh->block_total_length);
pcapng_debug("pcapng_read_section_header_block: SHB (byte-swapped) V%u.%u, len %u",
version_major, version_minor, bh->block_total_length);
break;
default:
/* Not a "pcapng" magic number we know about. */
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_section_header_block: unknown byte-order magic number 0x%08x", shb.magic);
/*
* See above comment about PCAPNG_BLOCK_NOT_SHB.
*/
return PCAPNG_BLOCK_NOT_SHB;
}
/*
* Is this block long enough to be an SHB?
*/
if (bh->block_total_length < MIN_SHB_SIZE) {
/*
* No.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_section_header_block: total block length %u of an SHB is less than the minimum SHB size %u",
bh->block_total_length, MIN_SHB_SIZE);
return PCAPNG_BLOCK_ERROR;
}
/* OK, at this point we assume it's a pcap-ng file.
Don't try to allocate memory for a huge number of options, as
that might fail and, even if it succeeds, it might not leave
any address space or memory+backing store for anything else.
We do that by imposing a maximum block size of MAX_BLOCK_SIZE.
We check for this *after* checking the SHB for its byte
order magic number, so that non-pcap-ng files are less
likely to be treated as bad pcap-ng files. */
if (bh->block_total_length > MAX_BLOCK_SIZE) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_section_header_block: total block length %u is too large (> %u)",
bh->block_total_length, MAX_BLOCK_SIZE);
return PCAPNG_BLOCK_ERROR;
}
/* we currently only understand SHB V1.0 */
if (version_major != 1 || version_minor > 0) {
*err = WTAP_ERR_UNSUPPORTED;
*err_info = g_strdup_printf("pcapng_read_section_header_block: unknown SHB version %u.%u",
pn->version_major, pn->version_minor);
return PCAPNG_BLOCK_ERROR;
}
pn->byte_swapped = byte_swapped;
pn->version_major = version_major;
pn->version_minor = version_minor;
wblock->block = wtap_block_create(WTAP_BLOCK_NG_SECTION);
section_data = (wtapng_mandatory_section_t*)wtap_block_get_mandatory_data(wblock->block);
/* 64bit section_length (currently unused) */
if (pn->byte_swapped) {
section_data->section_length = GUINT64_SWAP_LE_BE(shb.section_length);
} else {
section_data->section_length = shb.section_length;
}
/* Options */
to_read = bh->block_total_length - MIN_SHB_SIZE;
/* Allocate enough memory to hold all options */
opt_cont_buf_len = to_read;
option_content = (guint8 *)g_try_malloc(opt_cont_buf_len);
if (opt_cont_buf_len != 0 && option_content == NULL) {
*err = ENOMEM; /* we assume we're out of memory */
return PCAPNG_BLOCK_ERROR;
}
pcapng_debug("pcapng_read_section_header_block: Options %u bytes", to_read);
while (to_read != 0) {
/* read option */
pcapng_debug("pcapng_read_section_header_block: Options %u bytes remaining", to_read);
bytes_read = pcapng_read_option(fh, pn, &oh, option_content, opt_cont_buf_len, to_read, err, err_info, "section_header");
if (bytes_read <= 0) {
pcapng_debug("pcapng_read_section_header_block: failed to read option");
return PCAPNG_BLOCK_ERROR;
}
to_read -= bytes_read;
/* handle option content */
switch (oh.option_code) {
case(OPT_EOFOPT):
if (to_read != 0) {
pcapng_debug("pcapng_read_section_header_block: %u bytes after opt_endofopt", to_read);
}
/* padding should be ok here, just get out of this */
to_read = 0;
break;
case(OPT_COMMENT):
if (oh.option_length > 0 && oh.option_length < opt_cont_buf_len) {
tmp_content = g_strndup((char *)option_content, oh.option_length);
wtap_block_add_string_option(wblock->block, OPT_COMMENT, option_content, oh.option_length);
pcapng_debug("pcapng_read_section_header_block: opt_comment %s", tmp_content);
g_free(tmp_content);
} else {
pcapng_debug("pcapng_read_section_header_block: opt_comment length %u seems strange", oh.option_length);
}
break;
case(OPT_SHB_HARDWARE):
if (oh.option_length > 0 && oh.option_length < opt_cont_buf_len) {
tmp_content = g_strndup((char *)option_content, oh.option_length);
/* Fails with multiple options; we silently ignore the failure */
wtap_block_add_string_option(wblock->block, OPT_SHB_HARDWARE, option_content, oh.option_length);
pcapng_debug("pcapng_read_section_header_block: shb_hardware %s", tmp_content);
g_free(tmp_content);
} else {
pcapng_debug("pcapng_read_section_header_block: shb_hardware length %u seems strange", oh.option_length);
}
break;
case(OPT_SHB_OS):
if (oh.option_length > 0 && oh.option_length < opt_cont_buf_len) {
tmp_content = g_strndup((char *)option_content, oh.option_length);
/* Fails with multiple options; we silently ignore the failure */
wtap_block_add_string_option(wblock->block, OPT_SHB_OS, option_content, oh.option_length);
pcapng_debug("pcapng_read_section_header_block: shb_os %s", tmp_content);
g_free(tmp_content);
} else {
pcapng_debug("pcapng_read_section_header_block: shb_os length %u seems strange, opt buffsize %u", oh.option_length,to_read);
}
break;
case(OPT_SHB_USERAPPL):
if (oh.option_length > 0 && oh.option_length < opt_cont_buf_len) {
tmp_content = g_strndup((char *)option_content, oh.option_length);
/* Fails with multiple options; we silently ignore the failure */
wtap_block_add_string_option(wblock->block, OPT_SHB_USERAPPL, option_content, oh.option_length);
pcapng_debug("pcapng_read_section_header_block: shb_user_appl %s", tmp_content);
g_free(tmp_content);
} else {
pcapng_debug("pcapng_read_section_header_block: shb_user_appl length %u seems strange", oh.option_length);
}
break;
default:
pcapng_debug("pcapng_read_section_header_block: unknown option %u - ignoring %u bytes",
oh.option_code, oh.option_length);
}
}
g_free(option_content);
return PCAPNG_BLOCK_OK;
}
/* "Interface Description Block" */
static gboolean
pcapng_read_if_descr_block(wtap *wth, FILE_T fh, pcapng_block_header_t *bh,
pcapng_t *pn, wtapng_block_t *wblock, int *err,
gchar **err_info)
{
guint64 time_units_per_second = 1000000; /* default = 10^6 */
int tsprecision = WTAP_TSPREC_USEC;
int bytes_read;
guint to_read, opt_cont_buf_len;
pcapng_interface_description_block_t idb;
wtapng_if_descr_mandatory_t* if_descr_mand;
pcapng_option_header_t oh;
guint8 *option_content = NULL; /* Allocate as large as the options block */
gchar* tmp_content;
guint64 tmp64;
/*
* Is this block long enough to be an IDB?
*/
if (bh->block_total_length < MIN_IDB_SIZE) {
/*
* No.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_if_descr_block: total block length %u of an IDB is less than the minimum IDB size %u",
bh->block_total_length, MIN_IDB_SIZE);
return FALSE;
}
/* Don't try to allocate memory for a huge number of options, as
that might fail and, even if it succeeds, it might not leave
any address space or memory+backing store for anything else.
We do that by imposing a maximum block size of MAX_BLOCK_SIZE.
We check for this *after* checking the SHB for its byte
order magic number, so that non-pcap-ng files are less
likely to be treated as bad pcap-ng files. */
if (bh->block_total_length > MAX_BLOCK_SIZE) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_if_descr_block: total block length %u is too large (> %u)",
bh->block_total_length, MAX_BLOCK_SIZE);
return FALSE;
}
/* read block content */
if (!wtap_read_bytes(fh, &idb, sizeof idb, err, err_info)) {
pcapng_debug("pcapng_read_if_descr_block: failed to read IDB");
return FALSE;
}
/* mandatory values */
wblock->block = wtap_block_create(WTAP_BLOCK_IF_DESCR);
if_descr_mand = (wtapng_if_descr_mandatory_t*)wtap_block_get_mandatory_data(wblock->block);
if (pn->byte_swapped) {
if_descr_mand->link_type = GUINT16_SWAP_LE_BE(idb.linktype);
if_descr_mand->snap_len = GUINT32_SWAP_LE_BE(idb.snaplen);
} else {
if_descr_mand->link_type = idb.linktype;
if_descr_mand->snap_len = idb.snaplen;
}
if_descr_mand->wtap_encap = wtap_pcap_encap_to_wtap_encap(if_descr_mand->link_type);
if_descr_mand->time_units_per_second = time_units_per_second;
if_descr_mand->tsprecision = tsprecision;
pcapng_debug("pcapng_read_if_descr_block: IDB link_type %u (%s), snap %u",
if_descr_mand->link_type,
wtap_encap_string(if_descr_mand->wtap_encap),
if_descr_mand->snap_len);
if (if_descr_mand->snap_len > WTAP_MAX_PACKET_SIZE) {
/* This is unrealistic, but text2pcap currently uses 102400.
* We do not use this value, maybe we should check the
* snap_len of the packets against it. For now, only warn.
*/
pcapng_debug("pcapng_read_if_descr_block: snapshot length %u unrealistic.",
if_descr_mand->snap_len);
/*if_descr_mand->snap_len = WTAP_MAX_PACKET_SIZE;*/
}
/* Options */
to_read = bh->block_total_length - MIN_IDB_SIZE;
/* Allocate enough memory to hold all options */
opt_cont_buf_len = to_read;
option_content = (guint8 *)g_try_malloc(opt_cont_buf_len);
if (opt_cont_buf_len != 0 && option_content == NULL) {
*err = ENOMEM; /* we assume we're out of memory */
return FALSE;
}
while (to_read != 0) {
/* read option */
bytes_read = pcapng_read_option(fh, pn, &oh, option_content, opt_cont_buf_len, to_read, err, err_info, "if_descr");
if (bytes_read <= 0) {
pcapng_debug("pcapng_read_if_descr_block: failed to read option");
return FALSE;
}
to_read -= bytes_read;
/* handle option content */
switch (oh.option_code) {
case(OPT_EOFOPT): /* opt_endofopt */
if (to_read != 0) {
pcapng_debug("pcapng_read_if_descr_block: %u bytes after opt_endofopt", to_read);
}
/* padding should be ok here, just get out of this */
to_read = 0;
break;
case(OPT_COMMENT): /* opt_comment */
if (oh.option_length > 0 && oh.option_length < opt_cont_buf_len) {
tmp_content = g_strndup((char *)option_content, oh.option_length);
wtap_block_add_string_option(wblock->block, OPT_COMMENT, option_content, oh.option_length);
pcapng_debug("pcapng_read_if_descr_block: opt_comment %s", tmp_content);
g_free(tmp_content);
} else {
pcapng_debug("pcapng_read_if_descr_block: opt_comment length %u seems strange", oh.option_length);
}
break;
case(OPT_IDB_NAME): /* if_name */
if (oh.option_length > 0 && oh.option_length < opt_cont_buf_len) {
tmp_content = g_strndup((char *)option_content, oh.option_length);
/* Fails with multiple options; we silently ignore the failure */
wtap_block_add_string_option(wblock->block, OPT_IDB_NAME, option_content, oh.option_length);
pcapng_debug("pcapng_read_if_descr_block: if_name %s", tmp_content);
g_free(tmp_content);
} else {
pcapng_debug("pcapng_read_if_descr_block: if_name length %u seems strange", oh.option_length);
}
break;
case(OPT_IDB_DESCR): /* if_description */
if (oh.option_length > 0 && oh.option_length < opt_cont_buf_len) {
tmp_content = g_strndup((char *)option_content, oh.option_length);
/* Fails with multiple options; we silently ignore the failure */
wtap_block_add_string_option(wblock->block, OPT_IDB_DESCR, option_content, oh.option_length);
pcapng_debug("pcapng_read_if_descr_block: if_description %s", tmp_content);
g_free(tmp_content);
} else {
pcapng_debug("pcapng_read_if_descr_block: if_description length %u seems strange", oh.option_length);
}
break;
case(OPT_IDB_SPEED): /* if_speed */
if (oh.option_length == 8) {
/* Don't cast a guint8 * into a guint64 *--the
* guint8 * may not point to something that's
* aligned correctly.
*/
memcpy(&tmp64, option_content, sizeof(guint64));
if (pn->byte_swapped)
tmp64 = GUINT64_SWAP_LE_BE(tmp64);
/* Fails with multiple options; we silently ignore the failure */
wtap_block_add_uint64_option(wblock->block, OPT_IDB_SPEED, tmp64);
pcapng_debug("pcapng_read_if_descr_block: if_speed %" G_GINT64_MODIFIER "u (bps)", tmp64);
} else {
pcapng_debug("pcapng_read_if_descr_block: if_speed length %u not 8 as expected", oh.option_length);
}
break;
case(OPT_IDB_TSRESOL): /* if_tsresol */
if (oh.option_length == 1) {
guint64 base;
guint64 result;
guint8 i, exponent, if_tsresol;
if_tsresol = option_content[0];
if (if_tsresol & 0x80) {
base = 2;
} else {
base = 10;
}
exponent = (guint8)(if_tsresol & 0x7f);
if (((base == 2) && (exponent < 64)) || ((base == 10) && (exponent < 20))) {
result = 1;
for (i = 0; i < exponent; i++) {
result *= base;
}
time_units_per_second = result;
} else {
time_units_per_second = G_MAXUINT64;
}
if (time_units_per_second > (((guint64)1) << 32)) {
pcapng_debug("pcapng_open: time conversion might be inaccurate");
}
if_descr_mand->time_units_per_second = time_units_per_second;
/* Fails with multiple options; we silently ignore the failure */
wtap_block_add_uint8_option(wblock->block, OPT_IDB_TSRESOL, if_tsresol);
if (time_units_per_second >= 1000000000)
tsprecision = WTAP_TSPREC_NSEC;
else if (time_units_per_second >= 1000000)
tsprecision = WTAP_TSPREC_USEC;
else if (time_units_per_second >= 1000)
tsprecision = WTAP_TSPREC_MSEC;
else if (time_units_per_second >= 100)
tsprecision = WTAP_TSPREC_CSEC;
else if (time_units_per_second >= 10)
tsprecision = WTAP_TSPREC_DSEC;
else
tsprecision = WTAP_TSPREC_SEC;
if_descr_mand->tsprecision = tsprecision;
pcapng_debug("pcapng_read_if_descr_block: if_tsresol %u, units/s %" G_GINT64_MODIFIER "u, tsprecision %d", if_tsresol, if_descr_mand->time_units_per_second, tsprecision);
} else {
pcapng_debug("pcapng_read_if_descr_block: if_tsresol length %u not 1 as expected", oh.option_length);
}
break;
/*
* if_tzone 10 Time zone for GMT support (TODO: specify better). TODO: give a good example
*/
case(OPT_IDB_FILTER): /* if_filter */
if (oh.option_length > 0 && oh.option_length < opt_cont_buf_len) {
wtapng_if_descr_filter_t if_filter;
memset(&if_filter, 0, sizeof(if_filter));
/* The first byte of the Option Data keeps a code of the filter used (e.g. if this is a libpcap string,
* or BPF bytecode.
*/
if (option_content[0] == 0) {
if_filter.if_filter_str = g_strndup((char *)option_content+1, oh.option_length-1);
pcapng_debug("pcapng_read_if_descr_block: if_filter_str %s oh.option_length %u", if_filter.if_filter_str, oh.option_length);
} else if (option_content[0] == 1) {
if_filter.bpf_filter_len = oh.option_length-1;
if_filter.if_filter_bpf_bytes = (guint8 *)option_content+1;
}
/* Fails with multiple options; we silently ignore the failure */
wtap_block_add_custom_option(wblock->block, OPT_IDB_FILTER, &if_filter, sizeof if_filter);
g_free(if_filter.if_filter_str);
} else {
pcapng_debug("pcapng_read_if_descr_block: if_filter length %u seems strange", oh.option_length);
}
break;
case(OPT_IDB_OS): /* if_os */
/*
* if_os 12 A UTF-8 string containing the name of the operating system of the machine in which this interface is installed.
* This can be different from the same information that can be contained by the Section Header Block (Section 3.1 (Section Header Block (mandatory)))
* because the capture can have been done on a remote machine. "Windows XP SP2" / "openSUSE 10.2" / ...
*/
if (oh.option_length > 0 && oh.option_length < opt_cont_buf_len) {
tmp_content = g_strndup((char *)option_content, oh.option_length);
/* Fails with multiple options; we silently ignore the failure */
wtap_block_add_string_option(wblock->block, OPT_IDB_OS, option_content, oh.option_length);
pcapng_debug("pcapng_read_if_descr_block: if_os %s", tmp_content);
g_free(tmp_content);
} else {
pcapng_debug("pcapng_read_if_descr_block: if_os length %u seems strange", oh.option_length);
}
break;
case(OPT_IDB_FCSLEN): /* if_fcslen */
if (oh.option_length == 1) {
/* Fails with multiple options; we silently ignore the failure */
wtap_block_add_uint8_option(wblock->block, OPT_IDB_TSRESOL, option_content[0]);
pn->if_fcslen = option_content[0];
pcapng_debug("pcapng_read_if_descr_block: if_fcslen %u", pn->if_fcslen);
/* XXX - add sanity check */
} else {
pcapng_debug("pcapng_read_if_descr_block: if_fcslen length %u not 1 as expected", oh.option_length);
}
break;
/* TODO: process these! */
case(OPT_IDB_IP4ADDR):
/*
* Interface network address and netmask. This option can be
* repeated multiple times within the same Interface
* Description Block when multiple IPv4 addresses are assigned
* to the interface. 192 168 1 1 255 255 255 0
*/
case(OPT_IDB_IP6ADDR):
/*
* Interface network address and prefix length (stored in the
* last byte). This option can be repeated multiple times
* within the same Interface Description Block when multiple
* IPv6 addresses are assigned to the interface.
* 2001:0db8:85a3:08d3:1319:8a2e:0370:7344/64 is written (in
* hex) as "20 01 0d b8 85 a3 08 d3 13 19 8a 2e 03 70 73 44
* 40"
*/
case(OPT_IDB_MACADDR):
/*
* Interface Hardware MAC address (48 bits). 00 01 02 03 04 05
*/
case(OPT_IDB_EUIADDR):
/*
* Interface Hardware EUI address (64 bits), if available.
* TODO: give a good example
*/
case(OPT_IDB_TZONE):
/*
* Time zone for GMT support. TODO: specify better.
* TODO: give a good example.
*/
case(OPT_IDB_TSOFFSET):
/*
* A 64 bits integer value that specifies an offset (in
* seconds) that must be added to the timestamp of each packet
* to obtain the absolute timestamp of a packet. If the option
* is missing, the timestamps stored in the packet must be
* considered absolute timestamps. The time zone of the offset
* can be specified with the option if_tzone.
*
* TODO: won't a if_tsoffset_low for fractional second offsets
* be useful for highly synchronized capture systems? 1234
*/
default:
pcapng_debug("pcapng_read_if_descr_block: unknown option %u - ignoring %u bytes",
oh.option_code, oh.option_length);
}
}
g_free(option_content);
/*
* If the per-file encapsulation isn't known, set it to this
* interface's encapsulation.
*
* If it *is* known, and it isn't this interface's encapsulation,
* set it to WTAP_ENCAP_PER_PACKET, as this file doesn't
* have a single encapsulation for all interfaces in the file,
* so it probably doesn't have a single encapsulation for all
* packets in the file.
*/
if (wth->file_encap == WTAP_ENCAP_UNKNOWN) {
wth->file_encap = if_descr_mand->wtap_encap;
} else {
if (wth->file_encap != if_descr_mand->wtap_encap) {
wth->file_encap = WTAP_ENCAP_PER_PACKET;
}
}
/*
* The same applies to the per-file time stamp resolution.
*/
if (wth->file_tsprec == WTAP_TSPREC_UNKNOWN) {
wth->file_tsprec = if_descr_mand->tsprecision;
} else {
if (wth->file_tsprec != if_descr_mand->tsprecision) {
wth->file_tsprec = WTAP_TSPREC_PER_PACKET;
}
}
return TRUE;
}
static gboolean
pcapng_read_packet_block(FILE_T fh, pcapng_block_header_t *bh, pcapng_t *pn, wtapng_block_t *wblock, int *err, gchar **err_info, gboolean enhanced)
{
int bytes_read;
guint block_read;
guint to_read, opt_cont_buf_len;
pcapng_enhanced_packet_block_t epb;
pcapng_packet_block_t pb;
wtapng_packet_t packet;
guint32 block_total_length;
guint32 padding;
interface_info_t iface_info;
guint64 ts;
guint8 *opt_ptr;
pcapng_option_header_t *oh;
guint8 *option_content;
int pseudo_header_len;
int fcslen;
#ifdef HAVE_PLUGINS
option_handler *handler;
#endif
/* Don't try to allocate memory for a huge number of options, as
that might fail and, even if it succeeds, it might not leave
any address space or memory+backing store for anything else.
We do that by imposing a maximum block size of MAX_BLOCK_SIZE.
We check for this *after* checking the SHB for its byte
order magic number, so that non-pcap-ng files are less
likely to be treated as bad pcap-ng files. */
if (bh->block_total_length > MAX_BLOCK_SIZE) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_packet_block: total block length %u is too large (> %u)",
bh->block_total_length, MAX_BLOCK_SIZE);
return FALSE;
}
/* "(Enhanced) Packet Block" read fixed part */
if (enhanced) {
/*
* Is this block long enough to be an EPB?
*/
if (bh->block_total_length < MIN_EPB_SIZE) {
/*
* No.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_packet_block: total block length %u of an EPB is less than the minimum EPB size %u",
bh->block_total_length, MIN_EPB_SIZE);
return FALSE;
}
if (!wtap_read_bytes(fh, &epb, sizeof epb, err, err_info)) {
pcapng_debug("pcapng_read_packet_block: failed to read packet data");
return FALSE;
}
block_read = (guint)sizeof epb;
if (pn->byte_swapped) {
packet.interface_id = GUINT32_SWAP_LE_BE(epb.interface_id);
packet.drops_count = -1; /* invalid */
packet.ts_high = GUINT32_SWAP_LE_BE(epb.timestamp_high);
packet.ts_low = GUINT32_SWAP_LE_BE(epb.timestamp_low);
packet.cap_len = GUINT32_SWAP_LE_BE(epb.captured_len);
packet.packet_len = GUINT32_SWAP_LE_BE(epb.packet_len);
} else {
packet.interface_id = epb.interface_id;
packet.drops_count = -1; /* invalid */
packet.ts_high = epb.timestamp_high;
packet.ts_low = epb.timestamp_low;
packet.cap_len = epb.captured_len;
packet.packet_len = epb.packet_len;
}
pcapng_debug("pcapng_read_packet_block: EPB on interface_id %d, cap_len %d, packet_len %d",
packet.interface_id, packet.cap_len, packet.packet_len);
} else {
/*
* Is this block long enough to be a PB?
*/
if (bh->block_total_length < MIN_PB_SIZE) {
/*
* No.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_packet_block: total block length %u of a PB is less than the minimum PB size %u",
bh->block_total_length, MIN_PB_SIZE);
return FALSE;
}
if (!wtap_read_bytes(fh, &pb, sizeof pb, err, err_info)) {
pcapng_debug("pcapng_read_packet_block: failed to read packet data");
return FALSE;
}
block_read = (guint)sizeof pb;
if (pn->byte_swapped) {
packet.interface_id = GUINT16_SWAP_LE_BE(pb.interface_id);
packet.drops_count = GUINT16_SWAP_LE_BE(pb.drops_count);
packet.ts_high = GUINT32_SWAP_LE_BE(pb.timestamp_high);
packet.ts_low = GUINT32_SWAP_LE_BE(pb.timestamp_low);
packet.cap_len = GUINT32_SWAP_LE_BE(pb.captured_len);
packet.packet_len = GUINT32_SWAP_LE_BE(pb.packet_len);
} else {
packet.interface_id = pb.interface_id;
packet.drops_count = pb.drops_count;
packet.ts_high = pb.timestamp_high;
packet.ts_low = pb.timestamp_low;
packet.cap_len = pb.captured_len;
packet.packet_len = pb.packet_len;
}
pcapng_debug("pcapng_read_packet_block: PB on interface_id %d, cap_len %d, packet_len %d",
packet.interface_id, packet.cap_len, packet.packet_len);
}
/*
* How much padding is there at the end of the packet data?
*/
if ((packet.cap_len % 4) != 0)
padding = 4 - (packet.cap_len % 4);
else
padding = 0;
/* add padding bytes to "block total length" */
/* (the "block total length" of some example files don't contain the packet data padding bytes!) */
if (bh->block_total_length % 4) {
block_total_length = bh->block_total_length + 4 - (bh->block_total_length % 4);
} else {
block_total_length = bh->block_total_length;
}
pcapng_debug("pcapng_read_packet_block: block_total_length %d", block_total_length);
/*
* Is this block long enough to hold the packet data?
*/
if (enhanced) {
if (block_total_length <
MIN_EPB_SIZE + packet.cap_len + padding) {
/*
* No.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_packet_block: total block length %u of EPB is too small for %u bytes of packet data",
block_total_length, packet.cap_len);
return FALSE;
}
} else {
if (block_total_length <
MIN_PB_SIZE + packet.cap_len + padding) {
/*
* No.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_packet_block: total block length %u of PB is too small for %u bytes of packet data",
block_total_length, packet.cap_len);
return FALSE;
}
}
if (packet.cap_len > WTAP_MAX_PACKET_SIZE) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_packet_block: cap_len %u is larger than WTAP_MAX_PACKET_SIZE %u",
packet.cap_len, WTAP_MAX_PACKET_SIZE);
return FALSE;
}
pcapng_debug("pcapng_read_packet_block: packet data: packet_len %u captured_len %u interface_id %u",
packet.packet_len,
packet.cap_len,
packet.interface_id);
if (packet.interface_id >= pn->interfaces->len) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_packet_block: interface index %u is not less than interface count %u",
packet.interface_id, pn->interfaces->len);
return FALSE;
}
iface_info = g_array_index(pn->interfaces, interface_info_t,
packet.interface_id);
wblock->packet_header->rec_type = REC_TYPE_PACKET;
wblock->packet_header->presence_flags = WTAP_HAS_TS|WTAP_HAS_CAP_LEN|WTAP_HAS_INTERFACE_ID;
pcapng_debug("pcapng_read_packet_block: encapsulation = %d (%s), pseudo header size = %d.",
iface_info.wtap_encap,
wtap_encap_string(iface_info.wtap_encap),
pcap_get_phdr_size(iface_info.wtap_encap, &wblock->packet_header->pseudo_header));
wblock->packet_header->interface_id = packet.interface_id;
wblock->packet_header->pkt_encap = iface_info.wtap_encap;
wblock->packet_header->pkt_tsprec = iface_info.tsprecision;
memset((void *)&wblock->packet_header->pseudo_header, 0, sizeof(union wtap_pseudo_header));
pseudo_header_len = pcap_process_pseudo_header(fh,
WTAP_FILE_TYPE_SUBTYPE_PCAPNG,
iface_info.wtap_encap,
packet.cap_len,
TRUE,
wblock->packet_header,
err,
err_info);
if (pseudo_header_len < 0) {
return FALSE;
}
block_read += pseudo_header_len;
if (pseudo_header_len != pcap_get_phdr_size(iface_info.wtap_encap, &wblock->packet_header->pseudo_header)) {
pcapng_debug("pcapng_read_packet_block: Could only read %d bytes for pseudo header.",
pseudo_header_len);
}
wblock->packet_header->caplen = packet.cap_len - pseudo_header_len;
wblock->packet_header->len = packet.packet_len - pseudo_header_len;
/* Combine the two 32-bit pieces of the timestamp into one 64-bit value */
ts = (((guint64)packet.ts_high) << 32) | ((guint64)packet.ts_low);
wblock->packet_header->ts.secs = (time_t)(ts / iface_info.time_units_per_second);
wblock->packet_header->ts.nsecs = (int)(((ts % iface_info.time_units_per_second) * 1000000000) / iface_info.time_units_per_second);
/* "(Enhanced) Packet Block" read capture data */
if (!wtap_read_packet_bytes(fh, wblock->frame_buffer,
packet.cap_len - pseudo_header_len, err, err_info))
return FALSE;
block_read += packet.cap_len - pseudo_header_len;
/* jump over potential padding bytes at end of the packet data */
if (padding != 0) {
if (!file_skip(fh, padding, err))
return FALSE;
block_read += padding;
}
/* Option defaults */
wblock->packet_header->opt_comment = NULL;
wblock->packet_header->drop_count = -1;
wblock->packet_header->pack_flags = 0;
/* FCS length default */
fcslen = pn->if_fcslen;
/* Options
* opt_comment 1
* epb_flags 2
* epb_hash 3
* epb_dropcount 4
*/
to_read = block_total_length -
(int)sizeof(pcapng_block_header_t) -
block_read - /* fixed and variable part, including padding */
(int)sizeof(bh->block_total_length);
/* Allocate enough memory to hold all options */
opt_cont_buf_len = to_read;
ws_buffer_assure_space(&wblock->packet_header->ft_specific_data, opt_cont_buf_len);
opt_ptr = ws_buffer_start_ptr(&wblock->packet_header->ft_specific_data);
while (to_read != 0) {
/* read option */
oh = (pcapng_option_header_t *)(void *)opt_ptr;
option_content = opt_ptr + sizeof (pcapng_option_header_t);
bytes_read = pcapng_read_option(fh, pn, oh, option_content, opt_cont_buf_len, to_read, err, err_info, "packet");
if (bytes_read <= 0) {
pcapng_debug("pcapng_read_packet_block: failed to read option");
/* XXX - free anything? */
return FALSE;
}
block_read += bytes_read;
to_read -= bytes_read;
/* handle option content */
switch (oh->option_code) {
case(OPT_EOFOPT):
if (to_read != 0) {
pcapng_debug("pcapng_read_packet_block: %u bytes after opt_endofopt", to_read);
}
/* padding should be ok here, just get out of this */
to_read = 0;
break;
case(OPT_COMMENT):
if (oh->option_length > 0 && oh->option_length < opt_cont_buf_len) {
wblock->packet_header->presence_flags |= WTAP_HAS_COMMENTS;
wblock->packet_header->opt_comment = g_strndup((char *)option_content, oh->option_length);
pcapng_debug("pcapng_read_packet_block: length %u opt_comment '%s'", oh->option_length, wblock->packet_header->opt_comment);
} else {
pcapng_debug("pcapng_read_packet_block: opt_comment length %u seems strange", oh->option_length);
}
break;
case(OPT_EPB_FLAGS):
if (oh->option_length != 4) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_packet_block: packet block flags option length %u is not 4",
oh->option_length);
/* XXX - free anything? */
return FALSE;
}
/* Don't cast a guint8 * into a guint32 *--the
* guint8 * may not point to something that's
* aligned correctly.
*/
wblock->packet_header->presence_flags |= WTAP_HAS_PACK_FLAGS;
memcpy(&wblock->packet_header->pack_flags, option_content, sizeof(guint32));
if (pn->byte_swapped) {
wblock->packet_header->pack_flags = GUINT32_SWAP_LE_BE(wblock->packet_header->pack_flags);
memcpy(option_content, &wblock->packet_header->pack_flags, sizeof(guint32));
}
if (wblock->packet_header->pack_flags & 0x000001E0) {
/* The FCS length is present */
fcslen = (wblock->packet_header->pack_flags & 0x000001E0) >> 5;
}
pcapng_debug("pcapng_read_packet_block: pack_flags %u (ignored)", wblock->packet_header->pack_flags);
break;
case(OPT_EPB_HASH):
pcapng_debug("pcapng_read_packet_block: epb_hash %u currently not handled - ignoring %u bytes",
oh->option_code, oh->option_length);
break;
case(OPT_EPB_DROPCOUNT):
if (oh->option_length != 8) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_packet_block: packet block drop count option length %u is not 8",
oh->option_length);
/* XXX - free anything? */
return FALSE;
}
/* Don't cast a guint8 * into a guint64 *--the
* guint8 * may not point to something that's
* aligned correctly.
*/
wblock->packet_header->presence_flags |= WTAP_HAS_DROP_COUNT;
memcpy(&wblock->packet_header->drop_count, option_content, sizeof(guint64));
if (pn->byte_swapped) {
wblock->packet_header->drop_count = GUINT64_SWAP_LE_BE(wblock->packet_header->drop_count);
memcpy(option_content, &wblock->packet_header->drop_count, sizeof(guint64));
}
pcapng_debug("pcapng_read_packet_block: drop_count %" G_GINT64_MODIFIER "u", wblock->packet_header->drop_count);
break;
default:
#ifdef HAVE_PLUGINS
/*
* Do we have a handler for this packet block option code?
*/
if (option_handlers[BT_INDEX_PBS] != NULL &&
(handler = (option_handler *)g_hash_table_lookup(option_handlers[BT_INDEX_PBS],
GUINT_TO_POINTER((guint)oh->option_code))) != NULL) {
/* Yes - call the handler. */
if (!handler->hfunc(pn->byte_swapped, oh->option_length,
option_content, err, err_info))
/* XXX - free anything? */
return FALSE;
} else
#endif
{
pcapng_debug("pcapng_read_packet_block: unknown option %u - ignoring %u bytes",
oh->option_code, oh->option_length);
}
}
}
pcap_read_post_process(WTAP_FILE_TYPE_SUBTYPE_PCAPNG, iface_info.wtap_encap,
wblock->packet_header, ws_buffer_start_ptr(wblock->frame_buffer),
pn->byte_swapped, fcslen);
return TRUE;
}
static gboolean
pcapng_read_simple_packet_block(FILE_T fh, pcapng_block_header_t *bh, pcapng_t *pn, wtapng_block_t *wblock, int *err, gchar **err_info)
{
interface_info_t iface_info;
pcapng_simple_packet_block_t spb;
wtapng_simple_packet_t simple_packet;
guint32 block_total_length;
guint32 padding;
int pseudo_header_len;
/*
* Is this block long enough to be an SPB?
*/
if (bh->block_total_length < MIN_SPB_SIZE) {
/*
* No.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_simple_packet_block: total block length %u of an SPB is less than the minimum SPB size %u",
bh->block_total_length, MIN_SPB_SIZE);
return FALSE;
}
/* Don't try to allocate memory for a huge number of options, as
that might fail and, even if it succeeds, it might not leave
any address space or memory+backing store for anything else.
We do that by imposing a maximum block size of MAX_BLOCK_SIZE.
We check for this *after* checking the SHB for its byte
order magic number, so that non-pcap-ng files are less
likely to be treated as bad pcap-ng files. */
if (bh->block_total_length > MAX_BLOCK_SIZE) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_simple_packet_block: total block length %u is too large (> %u)",
bh->block_total_length, MAX_BLOCK_SIZE);
return FALSE;
}
/* "Simple Packet Block" read fixed part */
if (!wtap_read_bytes(fh, &spb, sizeof spb, err, err_info)) {
pcapng_debug("pcapng_read_simple_packet_block: failed to read packet data");
return FALSE;
}
if (0 >= pn->interfaces->len) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup("pcapng_read_simple_packet_block: SPB appeared before any IDBs");
return FALSE;
}
iface_info = g_array_index(pn->interfaces, interface_info_t, 0);
if (pn->byte_swapped) {
simple_packet.packet_len = GUINT32_SWAP_LE_BE(spb.packet_len);
} else {
simple_packet.packet_len = spb.packet_len;
}
/*
* The captured length is not a field in the SPB; it can be
* calculated as the minimum of the snapshot length from the
* IDB and the packet length, as per the pcap-ng spec. An IDB
* snapshot length of 0 means no limit.
*/
simple_packet.cap_len = simple_packet.packet_len;
if (simple_packet.cap_len > iface_info.snap_len && iface_info.snap_len != 0)
simple_packet.cap_len = iface_info.snap_len;
/*
* How much padding is there at the end of the packet data?
*/
if ((simple_packet.cap_len % 4) != 0)
padding = 4 - (simple_packet.cap_len % 4);
else
padding = 0;
/* add padding bytes to "block total length" */
/* (the "block total length" of some example files don't contain the packet data padding bytes!) */
if (bh->block_total_length % 4) {
block_total_length = bh->block_total_length + 4 - (bh->block_total_length % 4);
} else {
block_total_length = bh->block_total_length;
}
pcapng_debug("pcapng_read_simple_packet_block: block_total_length %d", block_total_length);
/*
* Is this block long enough to hold the packet data?
*/
if (block_total_length < MIN_SPB_SIZE + simple_packet.cap_len + padding) {
/*
* No. That means that the problem is with the packet
* length; the snapshot length can be bigger than the amount
* of packet data in the block, as it's a *maximum* length,
* not a *minimum* length.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_simple_packet_block: total block length %u of PB is too small for %u bytes of packet data",
block_total_length, simple_packet.packet_len);
return FALSE;
}
if (simple_packet.cap_len > WTAP_MAX_PACKET_SIZE) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_simple_packet_block: cap_len %u is larger than WTAP_MAX_PACKET_SIZE %u",
simple_packet.cap_len, WTAP_MAX_PACKET_SIZE);
return FALSE;
}
pcapng_debug("pcapng_read_simple_packet_block: packet data: packet_len %u",
simple_packet.packet_len);
pcapng_debug("pcapng_read_simple_packet_block: Need to read pseudo header of size %d",
pcap_get_phdr_size(iface_info.wtap_encap, &wblock->packet_header->pseudo_header));
/* No time stamp in a simple packet block; no options, either */
wblock->packet_header->rec_type = REC_TYPE_PACKET;
wblock->packet_header->presence_flags = WTAP_HAS_CAP_LEN|WTAP_HAS_INTERFACE_ID;
wblock->packet_header->interface_id = 0;
wblock->packet_header->pkt_encap = iface_info.wtap_encap;
wblock->packet_header->pkt_tsprec = iface_info.tsprecision;
wblock->packet_header->ts.secs = 0;
wblock->packet_header->ts.nsecs = 0;
wblock->packet_header->interface_id = 0;
wblock->packet_header->opt_comment = NULL;
wblock->packet_header->drop_count = 0;
wblock->packet_header->pack_flags = 0;
memset((void *)&wblock->packet_header->pseudo_header, 0, sizeof(union wtap_pseudo_header));
pseudo_header_len = pcap_process_pseudo_header(fh,
WTAP_FILE_TYPE_SUBTYPE_PCAPNG,
iface_info.wtap_encap,
simple_packet.cap_len,
TRUE,
wblock->packet_header,
err,
err_info);
if (pseudo_header_len < 0) {
return FALSE;
}
wblock->packet_header->caplen = simple_packet.cap_len - pseudo_header_len;
wblock->packet_header->len = simple_packet.packet_len - pseudo_header_len;
if (pseudo_header_len != pcap_get_phdr_size(iface_info.wtap_encap, &wblock->packet_header->pseudo_header)) {
pcapng_debug("pcapng_read_simple_packet_block: Could only read %d bytes for pseudo header.",
pseudo_header_len);
}
memset((void *)&wblock->packet_header->pseudo_header, 0, sizeof(union wtap_pseudo_header));
/* "Simple Packet Block" read capture data */
if (!wtap_read_packet_bytes(fh, wblock->frame_buffer,
simple_packet.cap_len, err, err_info))
return FALSE;
/* jump over potential padding bytes at end of the packet data */
if ((simple_packet.cap_len % 4) != 0) {
if (!file_skip(fh, 4 - (simple_packet.cap_len % 4), err))
return FALSE;
}
pcap_read_post_process(WTAP_FILE_TYPE_SUBTYPE_PCAPNG, iface_info.wtap_encap,
wblock->packet_header, ws_buffer_start_ptr(wblock->frame_buffer),
pn->byte_swapped, pn->if_fcslen);
return TRUE;
}
#define NRES_ENDOFRECORD 0
#define NRES_IP4RECORD 1
#define NRES_IP6RECORD 2
#define PADDING4(x) ((((x + 3) >> 2) << 2) - x)
/* IPv6 + MAXNAMELEN */
#define INITIAL_NRB_REC_SIZE (16 + 64)
/*
* Find the end of the NUL-terminated name the beginning of which is pointed
* to by p; record_len is the number of bytes remaining in the record.
*
* Return the length of the name, including the terminating NUL.
*
* If we don't find a terminating NUL, return -1 and set *err and
* *err_info appropriately.
*/
static int
name_resolution_block_find_name_end(const char *p, guint record_len, int *err,
gchar **err_info)
{
int namelen;
namelen = 0;
for (;;) {
if (record_len == 0) {
/*
* We ran out of bytes in the record without
* finding a NUL.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup("pcapng_read_name_resolution_block: NRB record has non-null-terminated host name");
return -1;
}
if (*p == '\0')
break; /* that's the terminating NUL */
p++;
record_len--;
namelen++; /* count this byte */
}
/* Include the NUL in the name length. */
return namelen + 1;
}
static gboolean
pcapng_read_name_resolution_block(FILE_T fh, pcapng_block_header_t *bh, pcapng_t *pn, wtapng_block_t *wblock, int *err, gchar **err_info)
{
int block_read;
int to_read;
pcapng_name_resolution_block_t nrb;
Buffer nrb_rec;
guint32 v4_addr;
guint record_len, opt_cont_buf_len;
char *namep;
int namelen;
int bytes_read;
pcapng_option_header_t oh;
guint8 *option_content;
#ifdef HAVE_PLUGINS
option_handler *handler;
#endif
gchar* tmp_content;
/*
* Is this block long enough to be an NRB?
*/
if (bh->block_total_length < MIN_NRB_SIZE) {
/*
* No.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_name_resolution_block: total block length %u of an NRB is less than the minimum NRB size %u",
bh->block_total_length, MIN_NRB_SIZE);
return FALSE;
}
/* Don't try to allocate memory for a huge number of options, as
that might fail and, even if it succeeds, it might not leave
any address space or memory+backing store for anything else.
We do that by imposing a maximum block size of MAX_BLOCK_SIZE.
We check for this *after* checking the SHB for its byte
order magic number, so that non-pcap-ng files are less
likely to be treated as bad pcap-ng files. */
if (bh->block_total_length > MAX_BLOCK_SIZE) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_name_resolution_block: total block length %u is too large (> %u)",
bh->block_total_length, MAX_BLOCK_SIZE);
return FALSE;
}
to_read = bh->block_total_length - 8 - 4; /* We have read the header and should not read the final block_total_length */
pcapng_debug("pcapng_read_name_resolution_block, total %d bytes", bh->block_total_length);
/* Ensure we have a name resolution block */
if (wblock->block == NULL) {
wblock->block = wtap_block_create(WTAP_BLOCK_NG_NRB);
}
/*
* Start out with a buffer big enough for an IPv6 address and one
* 64-byte name; we'll make the buffer bigger if necessary.
*/
ws_buffer_init(&nrb_rec, INITIAL_NRB_REC_SIZE);
block_read = 0;
while (block_read < to_read) {
/*
* There must be at least one record's worth of data
* here.
*/
if ((size_t)(to_read - block_read) < sizeof nrb) {
ws_buffer_free(&nrb_rec);
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_name_resolution_block: %d bytes left in the block < NRB record header size %u",
to_read - block_read,
(guint)sizeof nrb);
return FALSE;
}
if (!wtap_read_bytes(fh, &nrb, sizeof nrb, err, err_info)) {
ws_buffer_free(&nrb_rec);
pcapng_debug("pcapng_read_name_resolution_block: failed to read record header");
return FALSE;
}
block_read += (int)sizeof nrb;
if (pn->byte_swapped) {
nrb.record_type = GUINT16_SWAP_LE_BE(nrb.record_type);
nrb.record_len = GUINT16_SWAP_LE_BE(nrb.record_len);
}
if (to_read - block_read < nrb.record_len + PADDING4(nrb.record_len)) {
ws_buffer_free(&nrb_rec);
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_name_resolution_block: %d bytes left in the block < NRB record length + padding %u",
to_read - block_read,
nrb.record_len + PADDING4(nrb.record_len));
return FALSE;
}
switch (nrb.record_type) {
case NRES_ENDOFRECORD:
/* There shouldn't be any more data - but there MAY be options */
goto read_options;
break;
case NRES_IP4RECORD:
/*
* The smallest possible record must have
* a 4-byte IPv4 address, hence a minimum
* of 4 bytes.
*
* (The pcap-NG spec really indicates
* that it must be at least 5 bytes,
* as there must be at least one name,
* and it really must be at least 6
* bytes, as the name mustn't be null,
* but there's no need to fail if there
* aren't any names at all, and we
* should report a null name as such.)
*/
if (nrb.record_len < 4) {
ws_buffer_free(&nrb_rec);
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_name_resolution_block: NRB record length for IPv4 record %u < minimum length 4",
nrb.record_len);
return FALSE;
}
ws_buffer_assure_space(&nrb_rec, nrb.record_len);
if (!wtap_read_bytes(fh, ws_buffer_start_ptr(&nrb_rec),
nrb.record_len, err, err_info)) {
ws_buffer_free(&nrb_rec);
pcapng_debug("pcapng_read_name_resolution_block: failed to read IPv4 record data");
return FALSE;
}
block_read += nrb.record_len;
if (pn->add_new_ipv4) {
/*
* Scan through all the names in
* the record and add them.
*/
memcpy(&v4_addr,
ws_buffer_start_ptr(&nrb_rec), 4);
/* IPv4 address is in big-endian order in the file always, which is how we store
it internally as well, so don't byte-swap it */
for (namep = (char *)ws_buffer_start_ptr(&nrb_rec) + 4, record_len = nrb.record_len - 4;
record_len != 0;
namep += namelen, record_len -= namelen) {
/*
* Scan forward for a null
* byte.
*/
namelen = name_resolution_block_find_name_end(namep, record_len, err, err_info);
if (namelen == -1) {
ws_buffer_free(&nrb_rec);
return FALSE; /* fail */
}
pn->add_new_ipv4(v4_addr, namep);
}
}
if (!file_skip(fh, PADDING4(nrb.record_len), err)) {
ws_buffer_free(&nrb_rec);
return FALSE;
}
block_read += PADDING4(nrb.record_len);
break;
case NRES_IP6RECORD:
/*
* The smallest possible record must have
* a 16-byte IPv6 address, hence a minimum
* of 16 bytes.
*
* (The pcap-NG spec really indicates
* that it must be at least 17 bytes,
* as there must be at least one name,
* and it really must be at least 18
* bytes, as the name mustn't be null,
* but there's no need to fail if there
* aren't any names at all, and we
* should report a null name as such.)
*/
if (nrb.record_len < 16) {
ws_buffer_free(&nrb_rec);
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_name_resolution_block: NRB record length for IPv6 record %u < minimum length 16",
nrb.record_len);
return FALSE;
}
if (to_read < nrb.record_len) {
ws_buffer_free(&nrb_rec);
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_name_resolution_block: NRB record length for IPv6 record %u > remaining data in NRB",
nrb.record_len);
return FALSE;
}
ws_buffer_assure_space(&nrb_rec, nrb.record_len);
if (!wtap_read_bytes(fh, ws_buffer_start_ptr(&nrb_rec),
nrb.record_len, err, err_info)) {
ws_buffer_free(&nrb_rec);
return FALSE;
}
block_read += nrb.record_len;
if (pn->add_new_ipv6) {
for (namep = (char *)ws_buffer_start_ptr(&nrb_rec) + 16, record_len = nrb.record_len - 16;
record_len != 0;
namep += namelen, record_len -= namelen) {
/*
* Scan forward for a null
* byte.
*/
namelen = name_resolution_block_find_name_end(namep, record_len, err, err_info);
if (namelen == -1) {
ws_buffer_free(&nrb_rec);
return FALSE; /* fail */
}
pn->add_new_ipv6(ws_buffer_start_ptr(&nrb_rec),
namep);
}
}
if (!file_skip(fh, PADDING4(nrb.record_len), err)) {
ws_buffer_free(&nrb_rec);
return FALSE;
}
block_read += PADDING4(nrb.record_len);
break;
default:
pcapng_debug("pcapng_read_name_resolution_block: unknown record type 0x%x", nrb.record_type);
if (!file_skip(fh, nrb.record_len + PADDING4(nrb.record_len), err)) {
ws_buffer_free(&nrb_rec);
return FALSE;
}
block_read += nrb.record_len + PADDING4(nrb.record_len);
break;
}
}
read_options:
to_read -= block_read;
/* Options
* opt_comment 1
*
* TODO:
* ns_dnsname 2
* ns_dnsIP4addr 3
* ns_dnsIP6addr 4
*/
/* Allocate enough memory to hold all options */
opt_cont_buf_len = to_read;
option_content = (guint8 *)g_try_malloc(opt_cont_buf_len);
if (opt_cont_buf_len != 0 && option_content == NULL) {
*err = ENOMEM; /* we assume we're out of memory */
ws_buffer_free(&nrb_rec);
return FALSE;
}
while (to_read != 0) {
/* read option */
bytes_read = pcapng_read_option(fh, pn, &oh, option_content, opt_cont_buf_len, to_read, err, err_info, "name_resolution");
if (bytes_read <= 0) {
pcapng_debug("pcapng_read_name_resolution_block: failed to read option");
g_free(option_content);
ws_buffer_free(&nrb_rec);
return FALSE;
}
to_read -= bytes_read;
/* handle option content */
switch (oh.option_code) {
case(OPT_EOFOPT):
if (to_read != 0) {
pcapng_debug("pcapng_read_name_resolution_block: %u bytes after opt_endofopt", to_read);
}
/* padding should be ok here, just get out of this */
to_read = 0;
break;
case(OPT_COMMENT):
if (oh.option_length > 0 && oh.option_length < opt_cont_buf_len) {
tmp_content = g_strndup((char *)option_content, oh.option_length);
wtap_block_add_string_option(wblock->block, OPT_COMMENT, option_content, oh.option_length);
pcapng_debug("pcapng_read_name_resolution_block: length %u opt_comment '%s'", oh.option_length, tmp_content);
g_free(tmp_content);
} else {
pcapng_debug("pcapng_read_name_resolution_block: opt_comment length %u seems strange", oh.option_length);
}
break;
default:
#ifdef HAVE_PLUGINS
/*
* Do we have a handler for this network resolution block option code?
*/
if (option_handlers[BT_INDEX_NRB] != NULL &&
(handler = (option_handler *)g_hash_table_lookup(option_handlers[BT_INDEX_NRB],
GUINT_TO_POINTER((guint)oh.option_code))) != NULL) {
/* Yes - call the handler. */
if (!handler->hfunc(pn->byte_swapped, oh.option_length,
option_content, err, err_info)) {
g_free(option_content);
ws_buffer_free(&nrb_rec);
return FALSE;
}
} else
#endif
{
pcapng_debug("pcapng_read_name_resolution_block: unknown option %u - ignoring %u bytes",
oh.option_code, oh.option_length);
}
}
}
g_free(option_content);
ws_buffer_free(&nrb_rec);
return TRUE;
}
static gboolean
pcapng_read_interface_statistics_block(FILE_T fh, pcapng_block_header_t *bh, pcapng_t *pn, wtapng_block_t *wblock,int *err, gchar **err_info)
{
int bytes_read;
guint to_read, opt_cont_buf_len;
pcapng_interface_statistics_block_t isb;
pcapng_option_header_t oh;
guint8 *option_content = NULL; /* Allocate as large as the options block */
wtapng_if_stats_mandatory_t* if_stats_mand;
char* tmp_content;
/*
* Is this block long enough to be an ISB?
*/
if (bh->block_total_length < MIN_ISB_SIZE) {
/*
* No.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_interface_statistics_block: total block length %u is too small (< %u)",
bh->block_total_length, MIN_ISB_SIZE);
return FALSE;
}
/* Don't try to allocate memory for a huge number of options, as
that might fail and, even if it succeeds, it might not leave
any address space or memory+backing store for anything else.
We do that by imposing a maximum block size of MAX_BLOCK_SIZE.
We check for this *after* checking the SHB for its byte
order magic number, so that non-pcap-ng files are less
likely to be treated as bad pcap-ng files. */
if (bh->block_total_length > MAX_BLOCK_SIZE) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_interface_statistics_block: total block length %u is too large (> %u)",
bh->block_total_length, MAX_BLOCK_SIZE);
return FALSE;
}
/* "Interface Statistics Block" read fixed part */
if (!wtap_read_bytes(fh, &isb, sizeof isb, err, err_info)) {
pcapng_debug("pcapng_read_interface_statistics_block: failed to read packet data");
return FALSE;
}
wblock->block = wtap_block_create(WTAP_BLOCK_IF_STATS);
if_stats_mand = (wtapng_if_stats_mandatory_t*)wtap_block_get_mandatory_data(wblock->block);
if (pn->byte_swapped) {
if_stats_mand->interface_id = GUINT32_SWAP_LE_BE(isb.interface_id);
if_stats_mand->ts_high = GUINT32_SWAP_LE_BE(isb.timestamp_high);
if_stats_mand->ts_low = GUINT32_SWAP_LE_BE(isb.timestamp_low);
} else {
if_stats_mand->interface_id = isb.interface_id;
if_stats_mand->ts_high = isb.timestamp_high;
if_stats_mand->ts_low = isb.timestamp_low;
}
pcapng_debug("pcapng_read_interface_statistics_block: interface_id %u", if_stats_mand->interface_id);
/* Options */
to_read = bh->block_total_length -
(MIN_BLOCK_SIZE + (guint)sizeof isb); /* fixed and variable part, including padding */
/* Allocate enough memory to hold all options */
opt_cont_buf_len = to_read;
option_content = (guint8 *)g_try_malloc(opt_cont_buf_len);
if (opt_cont_buf_len != 0 && option_content == NULL) {
*err = ENOMEM; /* we assume we're out of memory */
return FALSE;
}
while (to_read != 0) {
/* read option */
bytes_read = pcapng_read_option(fh, pn, &oh, option_content, opt_cont_buf_len, to_read, err, err_info, "interface_statistics");
if (bytes_read <= 0) {
pcapng_debug("pcapng_read_interface_statistics_block: failed to read option");
return FALSE;
}
to_read -= bytes_read;
/* handle option content */
switch (oh.option_code) {
case(OPT_EOFOPT): /* opt_endofopt */
if (to_read != 0) {
pcapng_debug("pcapng_read_interface_statistics_block: %u bytes after opt_endofopt", to_read);
}
/* padding should be ok here, just get out of this */
to_read = 0;
break;
case(OPT_COMMENT): /* opt_comment */
if (oh.option_length > 0 && oh.option_length < opt_cont_buf_len) {
tmp_content = g_strndup((char *)option_content, oh.option_length);
wtap_block_add_string_option(wblock->block, OPT_COMMENT, option_content, oh.option_length);
pcapng_debug("pcapng_read_interface_statistics_block: opt_comment %s", tmp_content);
g_free(tmp_content);
} else {
pcapng_debug("pcapng_read_interface_statistics_block: opt_comment length %u seems strange", oh.option_length);
}
break;
case(OPT_ISB_STARTTIME): /* isb_starttime */
if (oh.option_length == 8) {
guint32 high, low;
guint64 starttime;
/* Don't cast a guint8 * into a guint32 *--the
* guint8 * may not point to something that's
* aligned correctly.
*/
memcpy(&high, option_content, sizeof(guint32));
memcpy(&low, option_content + sizeof(guint32), sizeof(guint32));
if (pn->byte_swapped) {
high = GUINT32_SWAP_LE_BE(high);
low = GUINT32_SWAP_LE_BE(low);
}
starttime = (guint64)high;
starttime <<= 32;
starttime += (guint64)low;
/* Fails with multiple options; we silently ignore the failure */
wtap_block_add_uint64_option(wblock->block, OPT_ISB_STARTTIME, starttime);
pcapng_debug("pcapng_read_interface_statistics_block: isb_starttime %" G_GINT64_MODIFIER "u", starttime);
} else {
pcapng_debug("pcapng_read_interface_statistics_block: isb_starttime length %u not 8 as expected", oh.option_length);
}
break;
case(OPT_ISB_ENDTIME): /* isb_endtime */
if (oh.option_length == 8) {
guint32 high, low;
guint64 endtime;
/* Don't cast a guint8 * into a guint32 *--the
* guint8 * may not point to something that's
* aligned correctly.
*/
memcpy(&high, option_content, sizeof(guint32));
memcpy(&low, option_content + sizeof(guint32), sizeof(guint32));
if (pn->byte_swapped) {
high = GUINT32_SWAP_LE_BE(high);
low = GUINT32_SWAP_LE_BE(low);
}
endtime = (guint64)high;
endtime <<= 32;
endtime += (guint64)low;
/* Fails with multiple options; we silently ignore the failure */
wtap_block_add_uint64_option(wblock->block, OPT_ISB_ENDTIME, endtime);
pcapng_debug("pcapng_read_interface_statistics_block: isb_endtime %" G_GINT64_MODIFIER "u", endtime);
} else {
pcapng_debug("pcapng_read_interface_statistics_block: isb_starttime length %u not 8 as expected", oh.option_length);
}
break;
case(OPT_ISB_IFRECV): /* isb_ifrecv */
if (oh.option_length == 8) {
guint64 ifrecv;
/* Don't cast a guint8 * into a guint64 *--the
* guint8 * may not point to something that's
* aligned correctly.
*/
memcpy(&ifrecv, option_content, sizeof(guint64));
if (pn->byte_swapped)
ifrecv = GUINT64_SWAP_LE_BE(ifrecv);
/* Fails with multiple options; we silently ignore the failure */
wtap_block_add_uint64_option(wblock->block, OPT_ISB_IFRECV, ifrecv);
pcapng_debug("pcapng_read_interface_statistics_block: isb_ifrecv %" G_GINT64_MODIFIER "u", ifrecv);
} else {
pcapng_debug("pcapng_read_interface_statistics_block: isb_ifrecv length %u not 8 as expected", oh.option_length);
}
break;
case(OPT_ISB_IFDROP): /* isb_ifdrop */
if (oh.option_length == 8) {
guint64 ifdrop;
/* Don't cast a guint8 * into a guint64 *--the
* guint8 * may not point to something that's
* aligned correctly.
*/
memcpy(&ifdrop, option_content, sizeof(guint64));
if (pn->byte_swapped)
ifdrop = GUINT64_SWAP_LE_BE(ifdrop);
/* Fails with multiple options; we silently ignore the failure */
wtap_block_add_uint64_option(wblock->block, OPT_ISB_IFDROP, ifdrop);
pcapng_debug("pcapng_read_interface_statistics_block: isb_ifdrop %" G_GINT64_MODIFIER "u", ifdrop);
} else {
pcapng_debug("pcapng_read_interface_statistics_block: isb_ifdrop length %u not 8 as expected", oh.option_length);
}
break;
case(OPT_ISB_FILTERACCEPT): /* isb_filteraccept 6 */
if (oh.option_length == 8) {
guint64 filteraccept;
/* Don't cast a guint8 * into a guint64 *--the
* guint8 * may not point to something that's
* aligned correctly.
*/
memcpy(&filteraccept, option_content, sizeof(guint64));
if (pn->byte_swapped)
filteraccept = GUINT64_SWAP_LE_BE(filteraccept);
/* Fails with multiple options; we silently ignore the failure */
wtap_block_add_uint64_option(wblock->block, OPT_ISB_FILTERACCEPT, filteraccept);
pcapng_debug("pcapng_read_interface_statistics_block: isb_filteraccept %" G_GINT64_MODIFIER "u", filteraccept);
} else {
pcapng_debug("pcapng_read_interface_statistics_block: isb_filteraccept length %u not 8 as expected", oh.option_length);
}
break;
case(OPT_ISB_OSDROP): /* isb_osdrop 7 */
if (oh.option_length == 8) {
guint64 osdrop;
/* Don't cast a guint8 * into a guint64 *--the
* guint8 * may not point to something that's
* aligned correctly.
*/
memcpy(&osdrop, option_content, sizeof(guint64));
if (pn->byte_swapped)
osdrop = GUINT64_SWAP_LE_BE(osdrop);
/* Fails with multiple options; we silently ignore the failure */
wtap_block_add_uint64_option(wblock->block, OPT_ISB_OSDROP, osdrop);
pcapng_debug("pcapng_read_interface_statistics_block: isb_osdrop %" G_GINT64_MODIFIER "u", osdrop);
} else {
pcapng_debug("pcapng_read_interface_statistics_block: isb_osdrop length %u not 8 as expected", oh.option_length);
}
break;
case(OPT_ISB_USRDELIV): /* isb_usrdeliv 8 */
if (oh.option_length == 8) {
guint64 usrdeliv;
/* Don't cast a guint8 * into a guint64 *--the
* guint8 * may not point to something that's
* aligned correctly.
*/
memcpy(&usrdeliv, option_content, sizeof(guint64));
if (pn->byte_swapped)
usrdeliv = GUINT64_SWAP_LE_BE(usrdeliv);
/* Fails with multiple options; we silently ignore the failure */
wtap_block_add_uint64_option(wblock->block, OPT_ISB_USRDELIV, usrdeliv);
pcapng_debug("pcapng_read_interface_statistics_block: isb_usrdeliv %" G_GINT64_MODIFIER "u", usrdeliv);
} else {
pcapng_debug("pcapng_read_interface_statistics_block: isb_usrdeliv length %u not 8 as expected", oh.option_length);
}
break;
default:
pcapng_debug("pcapng_read_interface_statistics_block: unknown option %u - ignoring %u bytes",
oh.option_code, oh.option_length);
}
}
g_free(option_content);
return TRUE;
}
static gboolean
pcapng_read_sysdig_event_block(FILE_T fh, pcapng_block_header_t *bh, pcapng_t *pn, wtapng_block_t *wblock, int *err, gchar **err_info)
{
unsigned block_read;
guint32 block_total_length;
guint16 cpu_id;
guint64 wire_ts;
guint64 ts;
guint64 thread_id;
guint32 event_len;
guint16 event_type;
if (bh->block_total_length < MIN_SYSDIG_EVENT_SIZE) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("%s: total block length %u is too small (< %u)", G_STRFUNC,
bh->block_total_length, MIN_SYSDIG_EVENT_SIZE);
return FALSE;
}
/* add padding bytes to "block total length" */
/* (the "block total length" of some example files don't contain any padding bytes!) */
if (bh->block_total_length % 4) {
block_total_length = bh->block_total_length + 4 - (bh->block_total_length % 4);
} else {
block_total_length = bh->block_total_length;
}
pcapng_debug("pcapng_read_sysdig_event_block: block_total_length %u",
bh->block_total_length);
wblock->packet_header->rec_type = REC_TYPE_SYSCALL;
wblock->packet_header->pseudo_header.sysdig_event.record_type = BLOCK_TYPE_SYSDIG_EVENT;
wblock->packet_header->presence_flags = WTAP_HAS_TS|WTAP_HAS_CAP_LEN /*|WTAP_HAS_INTERFACE_ID */;
wblock->packet_header->pkt_tsprec = WTAP_TSPREC_NSEC;
block_read = block_total_length;
if (!wtap_read_bytes(fh, &cpu_id, sizeof cpu_id, err, err_info)) {
pcapng_debug("pcapng_read_packet_block: failed to read sysdig event cpu id");
return FALSE;
}
if (!wtap_read_bytes(fh, &wire_ts, sizeof wire_ts, err, err_info)) {
pcapng_debug("pcapng_read_packet_block: failed to read sysdig event timestamp");
return FALSE;
}
if (!wtap_read_bytes(fh, &thread_id, sizeof thread_id, err, err_info)) {
pcapng_debug("pcapng_read_packet_block: failed to read sysdig event thread id");
return FALSE;
}
if (!wtap_read_bytes(fh, &event_len, sizeof event_len, err, err_info)) {
pcapng_debug("pcapng_read_packet_block: failed to read sysdig event length");
return FALSE;
}
if (!wtap_read_bytes(fh, &event_type, sizeof event_type, err, err_info)) {
pcapng_debug("pcapng_read_packet_block: failed to read sysdig event type");
return FALSE;
}
block_read -= MIN_SYSDIG_EVENT_SIZE;
wblock->packet_header->pseudo_header.sysdig_event.byte_order = G_BYTE_ORDER;
/* XXX Use Gxxx_FROM_LE macros instead? */
if (pn->byte_swapped) {
wblock->packet_header->pseudo_header.sysdig_event.byte_order =
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
G_BIG_ENDIAN;
#else
G_LITTLE_ENDIAN;
#endif
wblock->packet_header->pseudo_header.sysdig_event.cpu_id = GUINT16_SWAP_LE_BE(cpu_id);
ts = GUINT64_SWAP_LE_BE(wire_ts);
wblock->packet_header->pseudo_header.sysdig_event.thread_id = GUINT64_SWAP_LE_BE(thread_id);
wblock->packet_header->pseudo_header.sysdig_event.event_len = GUINT32_SWAP_LE_BE(event_len);
wblock->packet_header->pseudo_header.sysdig_event.event_type = GUINT16_SWAP_LE_BE(event_type);
} else {
wblock->packet_header->pseudo_header.sysdig_event.cpu_id = cpu_id;
ts = wire_ts;
wblock->packet_header->pseudo_header.sysdig_event.thread_id = thread_id;
wblock->packet_header->pseudo_header.sysdig_event.event_len = event_len;
wblock->packet_header->pseudo_header.sysdig_event.event_type = event_type;
}
wblock->packet_header->ts.secs = (time_t) (ts / 1000000000);
wblock->packet_header->ts.nsecs = (int) (ts % 1000000000);
wblock->packet_header->caplen = block_read;
wblock->packet_header->len = wblock->packet_header->pseudo_header.sysdig_event.event_len;
/* "Sysdig Event Block" read event data */
if (!wtap_read_packet_bytes(fh, wblock->frame_buffer,
block_read, err, err_info))
return FALSE;
/* XXX Read comment? */
return TRUE;
}
static gboolean
pcapng_read_unknown_block(FILE_T fh, pcapng_block_header_t *bh,
#
#ifdef HAVE_PLUGINS
pcapng_t *pn,
wtapng_block_t *wblock,
#else
pcapng_t *pn _U_,
wtapng_block_t *wblock _U_,
#endif
int *err, gchar **err_info)
{
guint32 block_read;
guint32 block_total_length;
#ifdef HAVE_PLUGINS
block_handler *handler;
#endif
if (bh->block_total_length < MIN_BLOCK_SIZE) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_read_unknown_block: total block length %u of an unknown block type is less than the minimum block size %u",
bh->block_total_length, MIN_BLOCK_SIZE);
return FALSE;
}
/* add padding bytes to "block total length" */
/* (the "block total length" of some example files don't contain any padding bytes!) */
if (bh->block_total_length % 4) {
block_total_length = bh->block_total_length + 4 - (bh->block_total_length % 4);
} else {
block_total_length = bh->block_total_length;
}
block_read = block_total_length - MIN_BLOCK_SIZE;
#ifdef HAVE_PLUGINS
/*
* Do we have a handler for this block type?
*/
if (block_handlers != NULL &&
(handler = (block_handler *)g_hash_table_lookup(block_handlers,
GUINT_TO_POINTER(bh->block_type))) != NULL) {
/* Yes - call it to read this block type. */
if (!handler->reader(fh, block_read, pn->byte_swapped,
wblock->packet_header, wblock->frame_buffer,
err, err_info))
return FALSE;
} else
#endif
{
/* No. Skip over this unknown block. */
if (!file_skip(fh, block_read, err)) {
return FALSE;
}
}
return TRUE;
}
static block_return_val
pcapng_read_block(wtap *wth, FILE_T fh, pcapng_t *pn, wtapng_block_t *wblock, int *err, gchar **err_info)
{
block_return_val ret;
pcapng_block_header_t bh;
guint32 block_total_length;
wblock->block = NULL;
/* Try to read the (next) block header */
if (!wtap_read_bytes_or_eof(fh, &bh, sizeof bh, err, err_info)) {
pcapng_debug("pcapng_read_block: wtap_read_bytes_or_eof() failed, err = %d.", *err);
if (*err == 0 || *err == WTAP_ERR_SHORT_READ) {
/*
* Short read or EOF.
*
* If we're reading this as part of an open,
* the file is too short to be a pcap-ng file.
*
* If we're not, we treat PCAPNG_BLOCK_NOT_SHB and
* PCAPNG_BLOCK_ERROR the same, so we can just return
* PCAPNG_BLOCK_NOT_SHB in both cases.
*/
return PCAPNG_BLOCK_NOT_SHB;
}
return PCAPNG_BLOCK_ERROR;
}
/*
* SHBs have to be treated differently from other blocks, as we
* might be doing an open and attempting to read a block at the
* beginning of the file to see if it's a pcap-ng file or not,
* and as they do not necessarily have the same byte order as
* previous blocks.
*/
if (bh.block_type == BLOCK_TYPE_SHB) {
/*
* BLOCK_TYPE_SHB has the same value regardless of byte order,
* so we don't need to byte-swap it.
*/
wblock->type = bh.block_type;
pcapng_debug("pcapng_read_block: block_type 0x%x", bh.block_type);
ret = pcapng_read_section_header_block(fh, &bh, pn, wblock, err, err_info);
if (ret != PCAPNG_BLOCK_OK) {
return ret;
}
} else {
if (pn->byte_swapped) {
bh.block_type = GUINT32_SWAP_LE_BE(bh.block_type);
bh.block_total_length = GUINT32_SWAP_LE_BE(bh.block_total_length);
}
wblock->type = bh.block_type;
pcapng_debug("pcapng_read_block: block_type 0x%x", bh.block_type);
if (!pn->shb_read) {
/*
* No SHB seen yet, so we're trying to read the first block
* during an open, to see whether it's an SHB; if what we
* read doesn't look like an SHB, this isn't a pcap-ng file.
*/
*err = 0;
*err_info = NULL;
return PCAPNG_BLOCK_NOT_SHB;
}
switch (bh.block_type) {
case(BLOCK_TYPE_IDB):
if (!pcapng_read_if_descr_block(wth, fh, &bh, pn, wblock, err, err_info))
return PCAPNG_BLOCK_ERROR;
break;
case(BLOCK_TYPE_PB):
if (!pcapng_read_packet_block(fh, &bh, pn, wblock, err, err_info, FALSE))
return PCAPNG_BLOCK_ERROR;
break;
case(BLOCK_TYPE_SPB):
if (!pcapng_read_simple_packet_block(fh, &bh, pn, wblock, err, err_info))
return PCAPNG_BLOCK_ERROR;
break;
case(BLOCK_TYPE_EPB):
if (!pcapng_read_packet_block(fh, &bh, pn, wblock, err, err_info, TRUE))
return PCAPNG_BLOCK_ERROR;
break;
case(BLOCK_TYPE_NRB):
if (!pcapng_read_name_resolution_block(fh, &bh, pn, wblock, err, err_info))
return PCAPNG_BLOCK_ERROR;
break;
case(BLOCK_TYPE_ISB):
if (!pcapng_read_interface_statistics_block(fh, &bh, pn, wblock, err, err_info))
return PCAPNG_BLOCK_ERROR;
break;
case(BLOCK_TYPE_SYSDIG_EVENT):
/* case(BLOCK_TYPE_SYSDIG_EVF): */
if (!pcapng_read_sysdig_event_block(fh, &bh, pn, wblock, err, err_info))
return PCAPNG_BLOCK_ERROR;
break;
default:
pcapng_debug("pcapng_read_block: Unknown block_type: 0x%x (block ignored), block total length %d", bh.block_type, bh.block_total_length);
if (!pcapng_read_unknown_block(fh, &bh, pn, wblock, err, err_info))
return PCAPNG_BLOCK_ERROR;
break;
}
}
/* sanity check: first and second block lengths must match */
if (!wtap_read_bytes(fh, &block_total_length, sizeof block_total_length,
err, err_info)) {
pcapng_debug("pcapng_check_block_trailer: couldn't read second block length");
return PCAPNG_BLOCK_ERROR;
}
if (pn->byte_swapped)
block_total_length = GUINT32_SWAP_LE_BE(block_total_length);
if (block_total_length != bh.block_total_length) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("pcapng_check_block_trailer: total block lengths (first %u and second %u) don't match",
bh.block_total_length, block_total_length);
return PCAPNG_BLOCK_ERROR;
}
return PCAPNG_BLOCK_OK;
}
/* Process an IDB that we've just read. The contents of wblock are copied as needed. */
static void
pcapng_process_idb(wtap *wth, pcapng_t *pcapng, wtapng_block_t *wblock)
{
wtap_block_t int_data = wtap_block_create(WTAP_BLOCK_IF_DESCR);
interface_info_t iface_info;
wtapng_if_descr_mandatory_t *if_descr_mand = (wtapng_if_descr_mandatory_t*)wtap_block_get_mandatory_data(int_data),
*wblock_if_descr_mand = (wtapng_if_descr_mandatory_t*)wtap_block_get_mandatory_data(wblock->block);
wtap_block_copy(int_data, wblock->block);
/* XXX if_tsoffset; opt 14 A 64 bits integer value that specifies an offset (in seconds)...*/
/* Interface statistics */
if_descr_mand->num_stat_entries = 0;
if_descr_mand->interface_statistics = NULL;
g_array_append_val(wth->interface_data, int_data);
iface_info.wtap_encap = wblock_if_descr_mand->wtap_encap;
iface_info.snap_len = wblock_if_descr_mand->snap_len;
iface_info.time_units_per_second = wblock_if_descr_mand->time_units_per_second;
iface_info.tsprecision = wblock_if_descr_mand->tsprecision;
g_array_append_val(pcapng->interfaces, iface_info);
}
/* classic wtap: open capture file */
wtap_open_return_val
pcapng_open(wtap *wth, int *err, gchar **err_info)
{
pcapng_t pn;
wtapng_block_t wblock;
pcapng_t *pcapng;
pcapng_block_header_t bh;
gint64 saved_offset;
pn.shb_read = FALSE;
/* we don't know the byte swapping of the file yet */
pn.byte_swapped = FALSE;
pn.if_fcslen = -1;
pn.version_major = -1;
pn.version_minor = -1;
pn.interfaces = NULL;
/* we don't expect any packet blocks yet */
wblock.frame_buffer = NULL;
wblock.packet_header = NULL;
pcapng_debug("pcapng_open: opening file");
/* read first block */
switch (pcapng_read_block(wth, wth->fh, &pn, &wblock, err, err_info)) {
case PCAPNG_BLOCK_OK:
/* No problem */
break;
case PCAPNG_BLOCK_NOT_SHB:
/* An error indicating that this isn't a pcap-ng file. */
wtap_block_free(wblock.block);
*err = 0;
*err_info = NULL;
return WTAP_OPEN_NOT_MINE;
case PCAPNG_BLOCK_ERROR:
/* An I/O error, or this probably *is* a pcap-ng file but not a valid one. */
wtap_block_free(wblock.block);
return WTAP_OPEN_ERROR;
}
/* first block must be a "Section Header Block" */
if (wblock.type != BLOCK_TYPE_SHB) {
/*
* XXX - check for damage from transferring a file
* between Windows and UN*X as text rather than
* binary data?
*/
pcapng_debug("pcapng_open: first block type %u not SHB", wblock.type);
wtap_block_free(wblock.block);
return WTAP_OPEN_NOT_MINE;
}
pn.shb_read = TRUE;
/*
* At this point, we've decided this is a pcap-NG file, not
* some other type of file, so we can't return WTAP_OPEN_NOT_MINE
* past this point.
*/
wtap_block_copy(g_array_index(wth->shb_hdrs, wtap_block_t, 0), wblock.block);
wtap_block_free(wblock.block);
wblock.block = NULL;
wth->file_encap = WTAP_ENCAP_UNKNOWN;
wth->snapshot_length = 0;
wth->file_tsprec = WTAP_TSPREC_UNKNOWN;
pcapng = (pcapng_t *)g_malloc(sizeof(pcapng_t));
wth->priv = (void *)pcapng;
*pcapng = pn;
pcapng->interfaces = g_array_new(FALSE, FALSE, sizeof(interface_info_t));
wth->subtype_read = pcapng_read;
wth->subtype_seek_read = pcapng_seek_read;
wth->subtype_close = pcapng_close;
wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_PCAPNG;
/* Loop over all IDB:s that appear before any packets */
while (1) {
/* peek at next block */
/* Try to read the (next) block header */
saved_offset = file_tell(wth->fh);
if (!wtap_read_bytes_or_eof(wth->fh, &bh, sizeof bh, err, err_info)) {
if (*err == 0) {
/* EOF */
pcapng_debug("No more IDBs available...");
break;
}
pcapng_debug("pcapng_open: Check for more IDB:s, wtap_read_bytes_or_eof() failed, err = %d.", *err);
return WTAP_OPEN_ERROR;
}
/* go back to where we were */
file_seek(wth->fh, saved_offset, SEEK_SET, err);
if (pn.byte_swapped) {
bh.block_type = GUINT32_SWAP_LE_BE(bh.block_type);
}
pcapng_debug("pcapng_open: Check for more IDB:s block_type 0x%x", bh.block_type);
if (bh.block_type != BLOCK_TYPE_IDB) {
break; /* No more IDB:s */
}
if (pcapng_read_block(wth, wth->fh, &pn, &wblock, err, err_info) != PCAPNG_BLOCK_OK) {
wtap_block_free(wblock.block);
if (*err == 0) {
pcapng_debug("No more IDBs available...");
break;
} else {
pcapng_debug("pcapng_open: couldn't read IDB");
return WTAP_OPEN_ERROR;
}
}
pcapng_process_idb(wth, pcapng, &wblock);
wtap_block_free(wblock.block);
pcapng_debug("pcapng_open: Read IDB number_of_interfaces %u, wtap_encap %i",
wth->interface_data->len, wth->file_encap);
}
return WTAP_OPEN_MINE;
}
/* classic wtap: read packet */
static gboolean
pcapng_read(wtap *wth, int *err, gchar **err_info, gint64 *data_offset)
{
pcapng_t *pcapng = (pcapng_t *)wth->priv;
wtapng_block_t wblock;
wtap_block_t wtapng_if_descr;
wtap_block_t if_stats;
wtapng_if_stats_mandatory_t *if_stats_mand_block, *if_stats_mand;
wtapng_if_descr_mandatory_t *wtapng_if_descr_mand;
wblock.frame_buffer = wth->frame_buffer;
wblock.packet_header = &wth->phdr;
pcapng->add_new_ipv4 = wth->add_new_ipv4;
pcapng->add_new_ipv6 = wth->add_new_ipv6;
/* read next block */
while (1) {
*data_offset = file_tell(wth->fh);
pcapng_debug("pcapng_read: data_offset is %" G_GINT64_MODIFIER "d", *data_offset);
if (pcapng_read_block(wth, wth->fh, pcapng, &wblock, err, err_info) != PCAPNG_BLOCK_OK) {
pcapng_debug("pcapng_read: data_offset is finally %" G_GINT64_MODIFIER "d", *data_offset);
pcapng_debug("pcapng_read: couldn't read packet block");
wtap_block_free(wblock.block);
return FALSE;
}
switch (wblock.type) {
case(BLOCK_TYPE_SHB):
pcapng_debug("pcapng_read: another section header block");
g_array_append_val(wth->shb_hdrs, wblock.block);
break;
case(BLOCK_TYPE_PB):
case(BLOCK_TYPE_SPB):
case(BLOCK_TYPE_EPB):
case(BLOCK_TYPE_SYSDIG_EVENT):
case(BLOCK_TYPE_SYSDIG_EVF):
/* packet block - we've found a packet */
goto got_packet;
case(BLOCK_TYPE_IDB):
/* A new interface */
pcapng_debug("pcapng_read: block type BLOCK_TYPE_IDB");
pcapng_process_idb(wth, pcapng, &wblock);
wtap_block_free(wblock.block);
break;
case(BLOCK_TYPE_NRB):
/* More name resolution entries */
pcapng_debug("pcapng_read: block type BLOCK_TYPE_NRB");
if (wth->nrb_hdrs == NULL) {
wth->nrb_hdrs = g_array_new(FALSE, FALSE, sizeof(wtap_block_t));
}
g_array_append_val(wth->nrb_hdrs, wblock.block);
break;
case(BLOCK_TYPE_ISB):
/* Another interface statistics report */
pcapng_debug("pcapng_read: block type BLOCK_TYPE_ISB");
if_stats_mand_block = (wtapng_if_stats_mandatory_t*)wtap_block_get_mandatory_data(wblock.block);
if (wth->interface_data->len <= if_stats_mand_block->interface_id) {
pcapng_debug("pcapng_read: BLOCK_TYPE_ISB wblock.if_stats.interface_id %u >= number_of_interfaces", if_stats_mand_block->interface_id);
} else {
/* Get the interface description */
wtapng_if_descr = g_array_index(wth->interface_data, wtap_block_t, if_stats_mand_block->interface_id);
wtapng_if_descr_mand = (wtapng_if_descr_mandatory_t*)wtap_block_get_mandatory_data(wtapng_if_descr);
if (wtapng_if_descr_mand->num_stat_entries == 0) {
/* First ISB found, no previous entry */
pcapng_debug("pcapng_read: block type BLOCK_TYPE_ISB. First ISB found, no previous entry");
wtapng_if_descr_mand->interface_statistics = g_array_new(FALSE, FALSE, sizeof(wtap_block_t));
}
if_stats = wtap_block_create(WTAP_BLOCK_IF_STATS);
if_stats_mand = (wtapng_if_stats_mandatory_t*)wtap_block_get_mandatory_data(if_stats);
if_stats_mand->interface_id = if_stats_mand_block->interface_id;
if_stats_mand->ts_high = if_stats_mand_block->ts_high;
if_stats_mand->ts_low = if_stats_mand_block->ts_low;
wtap_block_copy(if_stats, wblock.block);
g_array_append_val(wtapng_if_descr_mand->interface_statistics, if_stats);
wtapng_if_descr_mand->num_stat_entries++;
}
wtap_block_free(wblock.block);
break;
default:
/* XXX - improve handling of "unknown" blocks */
pcapng_debug("pcapng_read: Unknown block type 0x%08x", wblock.type);
break;
}
}
got_packet:
/*pcapng_debug("Read length: %u Packet length: %u", bytes_read, wth->phdr.caplen);*/
pcapng_debug("pcapng_read: data_offset is finally %" G_GINT64_MODIFIER "d", *data_offset);
return TRUE;
}
/* classic wtap: seek to file position and read packet */
static gboolean
pcapng_seek_read(wtap *wth, gint64 seek_off,
struct wtap_pkthdr *phdr, Buffer *buf,
int *err, gchar **err_info)
{
pcapng_t *pcapng = (pcapng_t *)wth->priv;
block_return_val ret;
wtapng_block_t wblock;
/* seek to the right file position */
if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) < 0) {
return FALSE; /* Seek error */
}
pcapng_debug("pcapng_seek_read: reading at offset %" G_GINT64_MODIFIER "u", seek_off);
wblock.frame_buffer = buf;
wblock.packet_header = phdr;
/* read the block */
ret = pcapng_read_block(wth, wth->random_fh, pcapng, &wblock, err, err_info);
wtap_block_free(wblock.block);
if (ret != PCAPNG_BLOCK_OK) {
pcapng_debug("pcapng_seek_read: couldn't read packet block (err=%d).",
*err);
return FALSE;
}
/* block must be a "Packet Block", an "Enhanced Packet Block",
a "Simple Packet Block", or an event */
if (wblock.type != BLOCK_TYPE_PB && wblock.type != BLOCK_TYPE_EPB &&
wblock.type != BLOCK_TYPE_SPB &&
wblock.type != BLOCK_TYPE_SYSDIG_EVENT && wblock.type != BLOCK_TYPE_SYSDIG_EVF) {
pcapng_debug("pcapng_seek_read: block type %u not PB/EPB/SPB", wblock.type);
return FALSE;
}
return TRUE;
}
/* classic wtap: close capture file */
static void
pcapng_close(wtap *wth)
{
pcapng_t *pcapng = (pcapng_t *)wth->priv;
pcapng_debug("pcapng_close: closing file");
g_array_free(pcapng->interfaces, TRUE);
}
typedef struct pcapng_block_size_t
{
guint32 size;
} pcapng_block_size_t;
static guint32 pcapng_compute_option_string_size(char *str)
{
guint32 size = 0, pad;
size = (guint32)strlen(str) & 0xffff;
if ((size % 4)) {
pad = 4 - (size % 4);
} else {
pad = 0;
}
size += pad;
return size;
}
static void compute_shb_option_size(wtap_block_t block _U_, guint option_id, wtap_opttype_e option_type _U_, wtap_optval_t* optval, void* user_data)
{
pcapng_block_size_t* block_size = (pcapng_block_size_t*)user_data;
guint32 size = 0;
switch(option_id)
{
case OPT_COMMENT:
case OPT_SHB_HARDWARE:
case OPT_SHB_OS:
case OPT_SHB_USERAPPL:
size = pcapng_compute_option_string_size(optval->stringval);
break;
default:
/* Unknown options - size by datatype? */
break;
}
block_size->size += size;
/* Add bytes for option header if option should be written */
if (size > 0) {
/* Add optional padding to 32 bits */
if ((block_size->size & 0x03) != 0)
{
block_size->size += 4 - (block_size->size & 0x03);
}
block_size->size += 4;
}
}
typedef struct pcapng_write_block_t
{
wtap_dumper *wdh;
int *err;
gboolean success;
}
pcapng_write_block_t;
static gboolean pcapng_write_option_string(wtap_dumper *wdh, guint option_id, char *str, int *err)
{
struct pcapng_option_header option_hdr;
guint32 size = (guint32)strlen(str) & 0xffff;
const guint32 zero_pad = 0;
guint32 pad;
if (size == 0)
return TRUE;
/* String options don't consider pad bytes part of the length */
option_hdr.type = (guint16)option_id;
option_hdr.value_length = (guint16)size;
if (!wtap_dump_file_write(wdh, &option_hdr, 4, err))
return FALSE;
wdh->bytes_dumped += 4;
if (!wtap_dump_file_write(wdh, str, size, err))
return FALSE;
wdh->bytes_dumped += size;
if ((size % 4)) {
pad = 4 - (size % 4);
} else {
pad = 0;
}
/* write padding (if any) */
if (pad != 0) {
if (!wtap_dump_file_write(wdh, &zero_pad, pad, err))
return FALSE;
wdh->bytes_dumped += pad;
}
return TRUE;
}
static void write_wtap_shb_option(wtap_block_t block _U_, guint option_id, wtap_opttype_e option_type _U_, wtap_optval_t *optval, void* user_data)
{
pcapng_write_block_t* write_block = (pcapng_write_block_t*)user_data;
/* Don't continue if there has been an error */
if (!write_block->success)
return;
switch(option_id)
{
case OPT_COMMENT:
case OPT_SHB_HARDWARE:
case OPT_SHB_OS:
case OPT_SHB_USERAPPL:
if (!pcapng_write_option_string(write_block->wdh, option_id, optval->stringval, write_block->err)) {
write_block->success = FALSE;
return;
}
break;
default:
/* Unknown options - write by datatype? */
break;
}
}
/* Write a section header block.
* If we don't have a section block header already, create a default
* one with no options.
*/
static gboolean
pcapng_write_section_header_block(wtap_dumper *wdh, int *err)
{
pcapng_block_header_t bh;
pcapng_section_header_block_t shb;
pcapng_block_size_t block_size;
struct pcapng_option_header option_hdr;
wtap_block_t wdh_shb = NULL;
if (wdh->shb_hdrs && (wdh->shb_hdrs->len > 0)) {
wdh_shb = g_array_index(wdh->shb_hdrs, wtap_block_t, 0);
}
block_size.size = 0;
bh.block_total_length = (guint32)(sizeof(bh) + sizeof(shb) + 4);
if (wdh_shb) {
pcapng_debug("pcapng_write_section_header_block: Have shb_hdr");
/* Compute block size */
wtap_block_foreach_option(wdh_shb, compute_shb_option_size, &block_size);
if (block_size.size > 0) {
/* End-of-options tag */
block_size.size += 4;
}
bh.block_total_length += block_size.size;
}
pcapng_debug("pcapng_write_section_header_block: Total len %u", bh.block_total_length);
/* write block header */
bh.block_type = BLOCK_TYPE_SHB;
if (!wtap_dump_file_write(wdh, &bh, sizeof bh, err))
return FALSE;
wdh->bytes_dumped += sizeof bh;
/* write block fixed content */
shb.magic = 0x1A2B3C4D;
shb.version_major = 1;
shb.version_minor = 0;
if (wdh_shb) {
wtapng_mandatory_section_t* section_data = (wtapng_mandatory_section_t*)wtap_block_get_mandatory_data(wdh_shb);
shb.section_length = section_data->section_length;
} else {
shb.section_length = -1;
}
if (!wtap_dump_file_write(wdh, &shb, sizeof shb, err))
return FALSE;
wdh->bytes_dumped += sizeof shb;
if (wdh_shb) {
pcapng_write_block_t block_data;
if (block_size.size > 0) {
/* Write options */
block_data.wdh = wdh;
block_data.err = err;
block_data.success = TRUE;
wtap_block_foreach_option(wdh_shb, write_wtap_shb_option, &block_data);
if (!block_data.success)
return FALSE;
/* Write end of options */
option_hdr.type = OPT_EOFOPT;
option_hdr.value_length = 0;
if (!wtap_dump_file_write(wdh, &option_hdr, 4, err))
return FALSE;
wdh->bytes_dumped += 4;
}
}
/* write block footer */
if (!wtap_dump_file_write(wdh, &bh.block_total_length,
sizeof bh.block_total_length, err))
return FALSE;
wdh->bytes_dumped += sizeof bh.block_total_length;
return TRUE;
}
static gboolean
pcapng_write_enhanced_packet_block(wtap_dumper *wdh,
const struct wtap_pkthdr *phdr,
const union wtap_pseudo_header *pseudo_header, const guint8 *pd, int *err)
{
pcapng_block_header_t bh;
pcapng_enhanced_packet_block_t epb;
guint64 ts;
const guint32 zero_pad = 0;
guint32 pad_len;
guint32 phdr_len;
gboolean have_options = FALSE;
guint32 options_total_length = 0;
struct option option_hdr;
guint32 comment_len = 0, comment_pad_len = 0;
wtap_block_t int_data;
wtapng_if_descr_mandatory_t *int_data_mand;
/* Don't write anything we're not willing to read. */
if (phdr->caplen > WTAP_MAX_PACKET_SIZE) {
*err = WTAP_ERR_PACKET_TOO_LARGE;
return FALSE;
}
phdr_len = (guint32)pcap_get_phdr_size(phdr->pkt_encap, pseudo_header);
if ((phdr_len + phdr->caplen) % 4) {
pad_len = 4 - ((phdr_len + phdr->caplen) % 4);
} else {
pad_len = 0;
}
/* Check if we should write comment option */
if (phdr->opt_comment) {
have_options = TRUE;
comment_len = (guint32)strlen(phdr->opt_comment) & 0xffff;
if ((comment_len % 4)) {
comment_pad_len = 4 - (comment_len % 4);
} else {
comment_pad_len = 0;
}
options_total_length = options_total_length + comment_len + comment_pad_len + 4 /* comment options tag */ ;
}
if (phdr->presence_flags & WTAP_HAS_PACK_FLAGS) {
have_options = TRUE;
options_total_length = options_total_length + 8;
}
if (have_options) {
/* End-of options tag */
options_total_length += 4;
}
/* write (enhanced) packet block header */
bh.block_type = BLOCK_TYPE_EPB;
bh.block_total_length = (guint32)sizeof(bh) + (guint32)sizeof(epb) + phdr_len + phdr->caplen + pad_len + options_total_length + 4;
if (!wtap_dump_file_write(wdh, &bh, sizeof bh, err))
return FALSE;
wdh->bytes_dumped += sizeof bh;
/* write block fixed content */
if (phdr->presence_flags & WTAP_HAS_INTERFACE_ID)
epb.interface_id = phdr->interface_id;
else {
/*
* XXX - we should support writing WTAP_ENCAP_PER_PACKET
* data to pcap-NG files even if we *don't* have interface
* IDs.
*/
epb.interface_id = 0;
}
/*
* Split the 64-bit timestamp into two 32-bit pieces, using
* the time stamp resolution for the interface.
*/
if (epb.interface_id >= wdh->interface_data->len) {
/*
* Our caller is doing something bad.
*/
*err = WTAP_ERR_INTERNAL;
return FALSE;
}
int_data = g_array_index(wdh->interface_data, wtap_block_t,
epb.interface_id);
int_data_mand = (wtapng_if_descr_mandatory_t*)wtap_block_get_mandatory_data(int_data);
ts = ((guint64)phdr->ts.secs) * int_data_mand->time_units_per_second +
(((guint64)phdr->ts.nsecs) * int_data_mand->time_units_per_second) / 1000000000;
epb.timestamp_high = (guint32)(ts >> 32);
epb.timestamp_low = (guint32)ts;
epb.captured_len = phdr->caplen + phdr_len;
epb.packet_len = phdr->len + phdr_len;
if (!wtap_dump_file_write(wdh, &epb, sizeof epb, err))
return FALSE;
wdh->bytes_dumped += sizeof epb;
/* write pseudo header */
if (!pcap_write_phdr(wdh, phdr->pkt_encap, pseudo_header, err)) {
return FALSE;
}
wdh->bytes_dumped += phdr_len;
/* write packet data */
if (!wtap_dump_file_write(wdh, pd, phdr->caplen, err))
return FALSE;
wdh->bytes_dumped += phdr->caplen;
/* write padding (if any) */
if (pad_len != 0) {
if (!wtap_dump_file_write(wdh, &zero_pad, pad_len, err))
return FALSE;
wdh->bytes_dumped += pad_len;
}
/* XXX - write (optional) block options */
/* options defined in Section 2.5 (Options)
* Name Code Length Description
* opt_comment 1 variable A UTF-8 string containing a comment that is associated to the current block.
*
* Enhanced Packet Block options
* epb_flags 2 4 A flags word containing link-layer information. A complete specification of
* the allowed flags can be found in Appendix A (Packet Block Flags Word).
* epb_hash 3 variable This option contains a hash of the packet. The first byte specifies the hashing algorithm,
* while the following bytes contain the actual hash, whose size depends on the hashing algorithm,
* and hence from the value in the first bit. The hashing algorithm can be: 2s complement
* (algorithm byte = 0, size=XXX), XOR (algorithm byte = 1, size=XXX), CRC32 (algorithm byte = 2, size = 4),
* MD-5 (algorithm byte = 3, size=XXX), SHA-1 (algorithm byte = 4, size=XXX).
* The hash covers only the packet, not the header added by the capture driver:
* this gives the possibility to calculate it inside the network card.
* The hash allows easier comparison/merging of different capture files, and reliable data transfer between the
* data acquisition system and the capture library.
* epb_dropcount 4 8 A 64bit integer value specifying the number of packets lost (by the interface and the operating system)
* between this packet and the preceding one.
* opt_endofopt 0 0 It delimits the end of the optional fields. This block cannot be repeated within a given list of options.
*/
if (phdr->opt_comment) {
option_hdr.type = OPT_COMMENT;
option_hdr.value_length = comment_len;
if (!wtap_dump_file_write(wdh, &option_hdr, 4, err))
return FALSE;
wdh->bytes_dumped += 4;
/* Write the comments string */
pcapng_debug("pcapng_write_enhanced_packet_block, comment:'%s' comment_len %u comment_pad_len %u" , phdr->opt_comment, comment_len, comment_pad_len);
if (!wtap_dump_file_write(wdh, phdr->opt_comment, comment_len, err))
return FALSE;
wdh->bytes_dumped += comment_len;
/* write padding (if any) */
if (comment_pad_len != 0) {
if (!wtap_dump_file_write(wdh, &zero_pad, comment_pad_len, err))
return FALSE;
wdh->bytes_dumped += comment_pad_len;
}
pcapng_debug("pcapng_write_enhanced_packet_block: Wrote Options comments: comment_len %u, comment_pad_len %u",
comment_len,
comment_pad_len);
}
if (phdr->presence_flags & WTAP_HAS_PACK_FLAGS) {
option_hdr.type = OPT_EPB_FLAGS;
option_hdr.value_length = 4;
if (!wtap_dump_file_write(wdh, &option_hdr, 4, err))
return FALSE;
wdh->bytes_dumped += 4;
if (!wtap_dump_file_write(wdh, &phdr->pack_flags, 4, err))
return FALSE;
wdh->bytes_dumped += 4;
pcapng_debug("pcapng_write_enhanced_packet_block: Wrote Options packet flags: %x", phdr->pack_flags);
}
/* Write end of options if we have options */
if (have_options) {
if (!wtap_dump_file_write(wdh, &zero_pad, 4, err))
return FALSE;
wdh->bytes_dumped += 4;
}
/* write block footer */
if (!wtap_dump_file_write(wdh, &bh.block_total_length,
sizeof bh.block_total_length, err))
return FALSE;
wdh->bytes_dumped += sizeof bh.block_total_length;
return TRUE;
}
static gboolean
pcapng_write_sysdig_event_block(wtap_dumper *wdh,
const struct wtap_pkthdr *phdr,
const union wtap_pseudo_header *pseudo_header, const guint8 *pd, int *err)
{
pcapng_block_header_t bh;
const guint32 zero_pad = 0;
guint32 pad_len;
guint32 phdr_len;
#if 0
gboolean have_options = FALSE;
struct option option_hdr;
guint32 comment_len = 0, comment_pad_len = 0;
#endif
guint32 options_total_length = 0;
guint16 cpu_id;
guint64 hdr_ts;
guint64 ts;
guint64 thread_id;
guint32 event_len;
guint16 event_type;
/* Don't write anything we're not willing to read. */
if (phdr->caplen > WTAP_MAX_PACKET_SIZE) {
*err = WTAP_ERR_PACKET_TOO_LARGE;
return FALSE;
}
phdr_len = (guint32)pcap_get_phdr_size(phdr->pkt_encap, pseudo_header);
if ((phdr_len + phdr->caplen) % 4) {
pad_len = 4 - ((phdr_len + phdr->caplen) % 4);
} else {
pad_len = 0;
}
#if 0
/* Check if we should write comment option */
if (phdr->opt_comment) {
have_options = TRUE;
comment_len = (guint32)strlen(phdr->opt_comment) & 0xffff;
if ((comment_len % 4)) {
comment_pad_len = 4 - (comment_len % 4);
} else {
comment_pad_len = 0;
}
options_total_length = options_total_length + comment_len + comment_pad_len + 4 /* comment options tag */ ;
}
if (have_options) {
/* End-of options tag */
options_total_length += 4;
}
#endif
/* write sysdig event block header */
bh.block_type = BLOCK_TYPE_SYSDIG_EVENT;
bh.block_total_length = (guint32)sizeof(bh) + SYSDIG_EVENT_HEADER_SIZE + phdr_len + phdr->caplen + pad_len + options_total_length + 4;
if (!wtap_dump_file_write(wdh, &bh, sizeof bh, err))
return FALSE;
wdh->bytes_dumped += sizeof bh;
/* Sysdig is always LE? */
cpu_id = GUINT16_TO_LE(pseudo_header->sysdig_event.cpu_id);
hdr_ts = (((guint64)phdr->ts.secs) * 1000000000) + phdr->ts.nsecs;
ts = GUINT64_TO_LE(hdr_ts);
thread_id = GUINT64_TO_LE(pseudo_header->sysdig_event.thread_id);
event_len = GUINT32_TO_LE(pseudo_header->sysdig_event.event_len);
event_type = GUINT16_TO_LE(pseudo_header->sysdig_event.event_type);
if (!wtap_dump_file_write(wdh, &cpu_id, sizeof cpu_id, err))
return FALSE;
wdh->bytes_dumped += sizeof cpu_id;
if (!wtap_dump_file_write(wdh, &ts, sizeof ts, err))
return FALSE;
wdh->bytes_dumped += sizeof ts;
if (!wtap_dump_file_write(wdh, &thread_id, sizeof thread_id, err))
return FALSE;
wdh->bytes_dumped += sizeof thread_id;
if (!wtap_dump_file_write(wdh, &event_len, sizeof event_len, err))
return FALSE;
wdh->bytes_dumped += sizeof event_len;
if (!wtap_dump_file_write(wdh, &event_type, sizeof event_type, err))
return FALSE;
wdh->bytes_dumped += sizeof event_type;
/* write event data */
if (!wtap_dump_file_write(wdh, pd, phdr->caplen, err))
return FALSE;
wdh->bytes_dumped += phdr->caplen;
/* write padding (if any) */
if (pad_len != 0) {
if (!wtap_dump_file_write(wdh, &zero_pad, pad_len, err))
return FALSE;
wdh->bytes_dumped += pad_len;
}
/* XXX Write comment? */
/* write block footer */
if (!wtap_dump_file_write(wdh, &bh.block_total_length,
sizeof bh.block_total_length, err))
return FALSE;
return TRUE;
}
/*
* libpcap's maximum pcapng block size is currently 16MB.
*
* The maximum pcapng block size in OS X's private pcapng reading code
* is 1MB. (Yes, this means that a program using the standard pcap
* code to read pcapng files can handle bigger blocks than can programs
* using the private code, such as Apple's tcpdump, can handle.)
*
* The pcapng reading code here can handle NRBs of arbitrary size (less
* than 4GB, obviously), as they read each NRB record independently,
* rather than reading the entire block into memory.
*
* So, for now, we set the maximum NRB block size we write as 1 MB.
*
* (Yes, for the benefit of the fussy, "MB" is really "MiB".)
*/
#define NRES_BLOCK_MAX_SIZE (1024*1024)
static void
compute_nrb_option_size(wtap_block_t block _U_, guint option_id, wtap_opttype_e option_type _U_, wtap_optval_t* optval, void* user_data)
{
pcapng_block_size_t* block_size = (pcapng_block_size_t*)user_data;
guint32 size = 0;
switch(option_id)
{
case OPT_COMMENT:
case OPT_NS_DNSNAME:
size = pcapng_compute_option_string_size(optval->stringval);
break;
case OPT_NS_DNSIP4ADDR:
size = 4;
break;
case OPT_NS_DNSIP6ADDR:
size = 16;
break;
default:
/* Unknown options - size by datatype? */
break;
}
block_size->size += size;
/* Add bytes for option header if option should be written */
if (size > 0) {
/* Add optional padding to 32 bits */
if ((block_size->size & 0x03) != 0)
{
block_size->size += 4 - (block_size->size & 0x03);
}
block_size->size += 4;
}
}
static void
put_nrb_option(wtap_block_t block _U_, guint option_id, wtap_opttype_e option_type _U_, wtap_optval_t* optval, void* user_data)
{
guint8 **opt_ptrp = (guint8 **)user_data;
guint32 size = 0;
struct pcapng_option_header option_hdr;
guint32 pad;
switch(option_id)
{
case OPT_COMMENT:
case OPT_NS_DNSNAME:
/* String options don't consider pad bytes part of the length */
size = (guint32)strlen(optval->stringval) & 0xffff;
option_hdr.type = (guint16)option_id;
option_hdr.value_length = (guint16)size;
memcpy(*opt_ptrp, &option_hdr, 4);
*opt_ptrp += 4;
memcpy(*opt_ptrp, optval->stringval, size);
*opt_ptrp += size;
if ((size % 4)) {
pad = 4 - (size % 4);
} else {
pad = 0;
}
/* put padding (if any) */
if (pad != 0) {
memset(*opt_ptrp, 0, pad);
*opt_ptrp += pad;
}
break;
case OPT_NS_DNSIP4ADDR:
option_hdr.type = (guint16)option_id;
option_hdr.value_length = 4;
memcpy(*opt_ptrp, &option_hdr, 4);
*opt_ptrp += 4;
memcpy(*opt_ptrp, &optval->ipv4val, 4);
*opt_ptrp += 4;
break;
case OPT_NS_DNSIP6ADDR:
option_hdr.type = (guint16)option_id;
option_hdr.value_length = 16;
memcpy(*opt_ptrp, &option_hdr, 4);
*opt_ptrp += 4;
memcpy(*opt_ptrp, &optval->ipv6val, 16);
*opt_ptrp += 16;
break;
default:
/* Unknown options - size by datatype? */
break;
}
}
static void
put_nrb_options(wtap_dumper *wdh, guint8 *opt_ptr)
{
if (wdh->nrb_hdrs && wdh->nrb_hdrs->len > 0) {
wtap_block_t nrb_hdr = g_array_index(wdh->nrb_hdrs, wtap_block_t, 0);
struct option option_hdr;
wtap_block_foreach_option(nrb_hdr, put_nrb_option, &opt_ptr);
/* Put end of options */
option_hdr.type = OPT_EOFOPT;
option_hdr.value_length = 0;
memcpy(opt_ptr, &option_hdr, 4);
}
}
static gboolean
pcapng_write_name_resolution_block(wtap_dumper *wdh, int *err)
{
pcapng_block_header_t bh;
pcapng_name_resolution_block_t nrb;
pcapng_block_size_t opts_size;
size_t max_rec_data_size;
guint8 *block_data;
guint32 block_off;
size_t hostnamelen;
guint16 namelen;
guint32 tot_rec_len;
hashipv4_t *ipv4_hash_list_entry;
hashipv6_t *ipv6_hash_list_entry;
int i;
if ((!wdh->addrinfo_lists) || ((!wdh->addrinfo_lists->ipv4_addr_list)&&(!wdh->addrinfo_lists->ipv6_addr_list))) {
/*
* No name/address pairs to write.
* XXX - what if we have options?
*/
return TRUE;
}
/* Calculate the space needed for options. */
opts_size.size = 0;
if (wdh->nrb_hdrs && wdh->nrb_hdrs->len > 0) {
wtap_block_t nrb_hdr = g_array_index(wdh->nrb_hdrs, wtap_block_t, 0);
wtap_block_foreach_option(nrb_hdr, compute_nrb_option_size, &opts_size);
if (opts_size.size > 0) {
/* End-of options tag */
opts_size.size += 4;
}
}
/*
* Make sure we can fit at least one maximum-sized record, plus
* an end-of-records record, plus the options, into a maximum-sized
* block.
*
* That requires that there be enough space for the block header
* (8 bytes), a maximum-sized record (2 bytes of record type, 2
* bytes of record value length, 65535 bytes of record value,
* and 1 byte of padding), an end-of-records record (4 bytes),
* the options (opts_size.size bytes), and the block trailer (4
* bytes).
*/
if (8 + 2 + 2 + 65535 + 1 + 4 + opts_size.size + 4 > NRES_BLOCK_MAX_SIZE) {
/*
* XXX - we can't even fit the options in the largest NRB size
* we're willing to write and still have room enough for a
* maximum-sized record. Just discard the information for now.
*/
return TRUE;
}
/*
* Allocate a buffer for the largest block we'll write.
*/
block_data = (guint8 *)g_malloc(NRES_BLOCK_MAX_SIZE);
/*
* Calculate the maximum amount of record data we'll be able to
* fit into such a block, after taking into account the block header
* (8 bytes), the end-of-records record (4 bytes), the options
* (opts_size.size bytes), and the block trailer (4 bytes).
*/
max_rec_data_size = NRES_BLOCK_MAX_SIZE - (8 + 4 + opts_size.size + 4);
block_off = 8; /* block type + block total length */
bh.block_type = BLOCK_TYPE_NRB;
bh.block_total_length = 12; /* block header + block trailer */
/*
* Write out the IPv4 resolved addresses, if any.
*/
if (wdh->addrinfo_lists->ipv4_addr_list){
i = 0;
ipv4_hash_list_entry = (hashipv4_t *)g_list_nth_data(wdh->addrinfo_lists->ipv4_addr_list, i);
while(ipv4_hash_list_entry != NULL){
nrb.record_type = NRES_IP4RECORD;
hostnamelen = strlen(ipv4_hash_list_entry->name);
if (hostnamelen > (G_MAXUINT16 - 4) - 1) {
/*
* This won't fit in the largest possible NRB record;
* discard it.
*/
i++;
ipv4_hash_list_entry = (hashipv4_t *)g_list_nth_data(wdh->addrinfo_lists->ipv4_addr_list, i);
continue;
}
namelen = (guint16)(hostnamelen + 1);
nrb.record_len = 4 + namelen; /* 4 bytes IPv4 address length */
/* 2 bytes record type, 2 bytes length field */
tot_rec_len = 4 + nrb.record_len + PADDING4(nrb.record_len);
if (block_off + tot_rec_len > max_rec_data_size) {
/*
* This record would overflow our maximum size for Name
* Resolution Blocks; write out all the records we created
* before it, and start a new NRB.
*/
/* Append the end-of-records record */
memset(block_data + block_off, 0, 4);
block_off += 4;
bh.block_total_length += 4;
/*
* Put the options into the block.
*
* XXX - this puts the same options in all NRBs.
*/
put_nrb_options(wdh, block_data + block_off);
block_off += opts_size.size;
bh.block_total_length += opts_size.size;
/* Copy the block header. */
memcpy(block_data, &bh, sizeof(bh));
/* Copy the block trailer. */
memcpy(block_data + block_off, &bh.block_total_length, sizeof(bh.block_total_length));
pcapng_debug("pcapng_write_name_resolution_block: Write bh.block_total_length bytes %d, block_off %u", bh.block_total_length, block_off);
if (!wtap_dump_file_write(wdh, block_data, bh.block_total_length, err)) {
g_free(block_data);
return FALSE;
}
wdh->bytes_dumped += bh.block_total_length;
/*Start a new NRB */
block_off = 8; /* block type + block total length */
bh.block_type = BLOCK_TYPE_NRB;
bh.block_total_length = 12; /* block header + block trailer */
}
bh.block_total_length += tot_rec_len;
memcpy(block_data + block_off, &nrb, sizeof(nrb));
block_off += 4;
memcpy(block_data + block_off, &(ipv4_hash_list_entry->addr), 4);
block_off += 4;
memcpy(block_data + block_off, ipv4_hash_list_entry->name, namelen);
block_off += namelen;
memset(block_data + block_off, 0, PADDING4(namelen));
block_off += PADDING4(namelen);
pcapng_debug("NRB: added IPv4 record for %s", ipv4_hash_list_entry->name);
i++;
ipv4_hash_list_entry = (hashipv4_t *)g_list_nth_data(wdh->addrinfo_lists->ipv4_addr_list, i);
}
g_list_free(wdh->addrinfo_lists->ipv4_addr_list);
wdh->addrinfo_lists->ipv4_addr_list = NULL;
}
if (wdh->addrinfo_lists->ipv6_addr_list){
i = 0;
ipv6_hash_list_entry = (hashipv6_t *)g_list_nth_data(wdh->addrinfo_lists->ipv6_addr_list, i);
while(ipv6_hash_list_entry != NULL){
nrb.record_type = NRES_IP6RECORD;
hostnamelen = strlen(ipv6_hash_list_entry->name);
if (hostnamelen > (G_MAXUINT16 - 16) - 1) {
/*
* This won't fit in the largest possible NRB record;
* discard it.
*/
i++;
ipv6_hash_list_entry = (hashipv6_t *)g_list_nth_data(wdh->addrinfo_lists->ipv6_addr_list, i);
continue;
}
namelen = (guint16)(hostnamelen + 1);
nrb.record_len = 16 + namelen; /* 16 bytes IPv6 address length */
/* 2 bytes record type, 2 bytes length field */
tot_rec_len = 4 + nrb.record_len + PADDING4(nrb.record_len);
if (block_off + tot_rec_len > max_rec_data_size) {
/*
* This record would overflow our maximum size for Name
* Resolution Blocks; write out all the records we created
* before it, and start a new NRB.
*/
/* Append the end-of-records record */
memset(block_data + block_off, 0, 4);
block_off += 4;
bh.block_total_length += 4;
/*
* Put the options into the block.
*
* XXX - this puts the same options in all NRBs.
*/
put_nrb_options(wdh, block_data + block_off);
block_off += opts_size.size;
bh.block_total_length += opts_size.size;
/* Copy the block header. */
memcpy(block_data, &bh, sizeof(bh));
/* Copy the block trailer. */
memcpy(block_data + block_off, &bh.block_total_length, sizeof(bh.block_total_length));
pcapng_debug("pcapng_write_name_resolution_block: Write bh.block_total_length bytes %d, block_off %u", bh.block_total_length, block_off);
if (!wtap_dump_file_write(wdh, block_data, bh.block_total_length, err)) {
g_free(block_data);
return FALSE;
}
wdh->bytes_dumped += bh.block_total_length;
/*Start a new NRB */
block_off = 8; /* block type + block total length */
bh.block_type = BLOCK_TYPE_NRB;
bh.block_total_length = 12; /* block header + block trailer */
}
bh.block_total_length += tot_rec_len;
memcpy(block_data + block_off, &nrb, sizeof(nrb));
block_off += 4;
memcpy(block_data + block_off, &(ipv6_hash_list_entry->addr), 16);
block_off += 16;
memcpy(block_data + block_off, ipv6_hash_list_entry->name, namelen);
block_off += namelen;
memset(block_data + block_off, 0, PADDING4(namelen));
block_off += PADDING4(namelen);
pcapng_debug("NRB: added IPv6 record for %s", ipv6_hash_list_entry->name);
i++;
ipv6_hash_list_entry = (hashipv6_t *)g_list_nth_data(wdh->addrinfo_lists->ipv6_addr_list, i);
}
g_list_free(wdh->addrinfo_lists->ipv6_addr_list);
wdh->addrinfo_lists->ipv6_addr_list = NULL;
}
/* Append the end-of-records record */
memset(block_data + block_off, 0, 4);
block_off += 4;
bh.block_total_length += 4;
/*
* Put the options into the block.
*/
put_nrb_options(wdh, block_data + block_off);
block_off += opts_size.size;
bh.block_total_length += opts_size.size;
/* Copy the block header. */
memcpy(block_data, &bh, sizeof(bh));
/* Copy the block trailer. */
memcpy(block_data + block_off, &bh.block_total_length, sizeof(bh.block_total_length));
pcapng_debug("pcapng_write_name_resolution_block: Write bh.block_total_length bytes %d, block_off %u", bh.block_total_length, block_off);
if (!wtap_dump_file_write(wdh, block_data, bh.block_total_length, err)) {
g_free(block_data);
return FALSE;
}
wdh->bytes_dumped += bh.block_total_length;
g_free(block_data);
return TRUE;
}
static void compute_isb_option_size(wtap_block_t block _U_, guint option_id, wtap_opttype_e option_type _U_, wtap_optval_t *optval, void* user_data)
{
pcapng_block_size_t* block_size = (pcapng_block_size_t*)user_data;
guint32 size = 0;
switch(option_id)
{
case OPT_COMMENT:
size = pcapng_compute_option_string_size(optval->stringval);
break;
case OPT_ISB_STARTTIME:
case OPT_ISB_ENDTIME:
size = 8;
break;
case OPT_ISB_IFRECV:
case OPT_ISB_IFDROP:
case OPT_ISB_FILTERACCEPT:
case OPT_ISB_OSDROP:
case OPT_ISB_USRDELIV:
size = 8;
break;
default:
/* Unknown options - size by datatype? */
break;
}
block_size->size += size;
/* Add bytes for option header if option should be written */
if (size > 0) {
/* Add optional padding to 32 bits */
if ((block_size->size & 0x03) != 0)
{
block_size->size += 4 - (block_size->size & 0x03);
}
block_size->size += 4;
}
}
static void write_wtap_isb_option(wtap_block_t block _U_, guint option_id, wtap_opttype_e option_type _U_, wtap_optval_t *optval, void* user_data)
{
pcapng_write_block_t* write_block = (pcapng_write_block_t*)user_data;
struct pcapng_option_header option_hdr;
/* Don't continue if there has been an error */
if (!write_block->success)
return;
switch(option_id)
{
case OPT_COMMENT:
if (!pcapng_write_option_string(write_block->wdh, option_id, optval->stringval, write_block->err)) {
write_block->success = FALSE;
return;
}
break;
case OPT_ISB_STARTTIME:
case OPT_ISB_ENDTIME:
{
guint32 high, low;
option_hdr.type = option_id;
option_hdr.value_length = 8;
if (!wtap_dump_file_write(write_block->wdh, &option_hdr, 4, write_block->err)) {
write_block->success = FALSE;
return;
}
write_block->wdh->bytes_dumped += 4;
high = (guint32)(optval->uint64val >> 32);
low = (guint32)(optval->uint64val >> 0);
if (!wtap_dump_file_write(write_block->wdh, &high, sizeof(guint32), write_block->err)) {
write_block->success = FALSE;
return;
}
write_block->wdh->bytes_dumped += 4;
if (!wtap_dump_file_write(write_block->wdh, &low, sizeof(guint32), write_block->err)) {
write_block->success = FALSE;
return;
}
write_block->wdh->bytes_dumped += 4;
}
break;
case OPT_ISB_IFRECV:
case OPT_ISB_IFDROP:
case OPT_ISB_FILTERACCEPT:
case OPT_ISB_OSDROP:
case OPT_ISB_USRDELIV:
{
option_hdr.type = option_id;
option_hdr.value_length = 8;
if (!wtap_dump_file_write(write_block->wdh, &option_hdr, 4, write_block->err)) {
write_block->success = FALSE;
return;
}
write_block->wdh->bytes_dumped += 4;
if (!wtap_dump_file_write(write_block->wdh, &optval->uint64val, sizeof(guint64), write_block->err)) {
write_block->success = FALSE;
return;
}
write_block->wdh->bytes_dumped += 8;
}
break;
default:
/* Unknown options - write by datatype? */
break;
}
}
static gboolean
pcapng_write_interface_statistics_block(wtap_dumper *wdh, wtap_block_t if_stats, int *err)
{
pcapng_block_header_t bh;
pcapng_interface_statistics_block_t isb;
pcapng_block_size_t block_size;
pcapng_write_block_t block_data;
struct pcapng_option_header option_hdr;
wtapng_if_stats_mandatory_t* mand_data = (wtapng_if_stats_mandatory_t*)wtap_block_get_mandatory_data(if_stats);
pcapng_debug("pcapng_write_interface_statistics_block");
/* Compute block size */
block_size.size = 0;
wtap_block_foreach_option(if_stats, compute_isb_option_size, &block_size);
if (block_size.size > 0) {
/* End-of-options tag */
block_size.size += 4;
}
/* write block header */
bh.block_type = BLOCK_TYPE_ISB;
bh.block_total_length = (guint32)(sizeof(bh) + sizeof(isb) + block_size.size + 4);
pcapng_debug("pcapng_write_interface_statistics_block: Total len %u", bh.block_total_length);
if (!wtap_dump_file_write(wdh, &bh, sizeof bh, err))
return FALSE;
wdh->bytes_dumped += sizeof bh;
/* write block fixed content */
isb.interface_id = mand_data->interface_id;
isb.timestamp_high = mand_data->ts_high;
isb.timestamp_low = mand_data->ts_low;
if (!wtap_dump_file_write(wdh, &isb, sizeof isb, err))
return FALSE;
wdh->bytes_dumped += sizeof isb;
/* Write options */
if (block_size.size > 0) {
block_data.wdh = wdh;
block_data.err = err;
block_data.success = TRUE;
wtap_block_foreach_option(if_stats, write_wtap_isb_option, &block_data);
if (!block_data.success)
return FALSE;
/* Write end of options */
option_hdr.type = OPT_EOFOPT;
option_hdr.value_length = 0;
if (!wtap_dump_file_write(wdh, &option_hdr, 4, err))
return FALSE;
wdh->bytes_dumped += 4;
}
/* write block footer */
if (!wtap_dump_file_write(wdh, &bh.block_total_length,
sizeof bh.block_total_length, err))
return FALSE;
wdh->bytes_dumped += sizeof bh.block_total_length;
return TRUE;
}
static void compute_idb_option_size(wtap_block_t block _U_, guint option_id, wtap_opttype_e option_type _U_, wtap_optval_t *optval, void* user_data)
{
pcapng_block_size_t* block_size = (pcapng_block_size_t*)user_data;
guint32 size = 0;
switch(option_id)
{
case OPT_COMMENT:
case OPT_IDB_NAME:
case OPT_IDB_DESCR:
case OPT_IDB_OS:
size = pcapng_compute_option_string_size(optval->stringval);
break;
case OPT_IDB_SPEED:
size = 8;
break;
case OPT_IDB_TSRESOL:
size = 1;
break;
case OPT_IDB_FILTER:
{
wtapng_if_descr_filter_t* filter = (wtapng_if_descr_filter_t*)optval->customval.data;
guint32 pad;
if (filter->if_filter_str != NULL) {
size = (guint32)(strlen(filter->if_filter_str) + 1) & 0xffff;
if ((size % 4)) {
pad = 4 - (size % 4);
} else {
pad = 0;
}
size += pad;
}
}
break;
case OPT_IDB_FCSLEN:
/* XXX - Not currently writing value */
break;
default:
/* Unknown options - size by datatype? */
break;
}
block_size->size += size;
/* Add bytes for option header if option should be written */
if (size > 0) {
/* Add optional padding to 32 bits */
if ((block_size->size & 0x03) != 0)
{
block_size->size += 4 - (block_size->size & 0x03);
}
block_size->size += 4;
}
}
static void write_wtap_idb_option(wtap_block_t block _U_, guint option_id, wtap_opttype_e option_type _U_, wtap_optval_t *optval, void* user_data)
{
pcapng_write_block_t* write_block = (pcapng_write_block_t*)user_data;
struct pcapng_option_header option_hdr;
const guint32 zero_pad = 0;
switch(option_id)
{
case OPT_COMMENT:
case OPT_IDB_NAME:
case OPT_IDB_DESCR:
case OPT_IDB_OS:
if (!pcapng_write_option_string(write_block->wdh, option_id, optval->stringval, write_block->err)) {
write_block->success = FALSE;
return;
}
break;
case OPT_IDB_SPEED:
option_hdr.type = option_id;
option_hdr.value_length = 8;
if (!wtap_dump_file_write(write_block->wdh, &option_hdr, 4, write_block->err)) {
write_block->success = FALSE;
return;
}
write_block->wdh->bytes_dumped += 4;
if (!wtap_dump_file_write(write_block->wdh, &optval->uint64val, sizeof(guint64), write_block->err)) {
write_block->success = FALSE;
return;
}
write_block->wdh->bytes_dumped += 8;
break;
case OPT_IDB_TSRESOL:
option_hdr.type = option_id;
option_hdr.value_length = 1;
if (!wtap_dump_file_write(write_block->wdh, &option_hdr, 4, write_block->err)) {
write_block->success = FALSE;
return;
}
write_block->wdh->bytes_dumped += 4;
if (!wtap_dump_file_write(write_block->wdh, &optval->uint8val, 1, write_block->err)) {
write_block->success = FALSE;
return;
}
write_block->wdh->bytes_dumped += 1;
if (!wtap_dump_file_write(write_block->wdh, &zero_pad, 3, write_block->err)) {
write_block->success = FALSE;
return;
}
write_block->wdh->bytes_dumped += 3;
break;
case OPT_IDB_FILTER:
{
wtapng_if_descr_filter_t* filter = (wtapng_if_descr_filter_t*)optval->customval.data;
guint32 size, pad;
if (filter->if_filter_str != NULL) {
size = (guint32)(strlen(filter->if_filter_str) + 1) & 0xffff;
if ((size % 4)) {
pad = 4 - (size % 4);
} else {
pad = 0;
}
option_hdr.type = option_id;
option_hdr.value_length = size;
if (!wtap_dump_file_write(write_block->wdh, &option_hdr, 4, write_block->err)) {
write_block->success = FALSE;
return;
}
write_block->wdh->bytes_dumped += 4;
/* Write the zero indicating libpcap filter variant */
if (!wtap_dump_file_write(write_block->wdh, &zero_pad, 1, write_block->err)) {
write_block->success = FALSE;
return;
}
write_block->wdh->bytes_dumped += 1;
/* if_filter_str_len includes the leading byte indicating filter type (libpcap str or BPF code) */
if (!wtap_dump_file_write(write_block->wdh, filter->if_filter_str, size-1, write_block->err)) {
write_block->success = FALSE;
return;
}
write_block->wdh->bytes_dumped += size - 1;
/* write padding (if any) */
if (pad != 0) {
if (!wtap_dump_file_write(write_block->wdh, &zero_pad, pad, write_block->err)) {
write_block->success = FALSE;
return;
}
write_block->wdh->bytes_dumped += pad;
}
}
}
break;
case OPT_IDB_FCSLEN:
/* XXX - Not currently writing value */
break;
default:
/* Unknown options - size by datatype? */
break;
}
}
static gboolean
pcapng_write_if_descr_block(wtap_dumper *wdh, wtap_block_t int_data, int *err)
{
pcapng_block_header_t bh;
pcapng_interface_description_block_t idb;
pcapng_block_size_t block_size;
pcapng_write_block_t block_data;
struct pcapng_option_header option_hdr;
wtapng_if_descr_mandatory_t* mand_data = (wtapng_if_descr_mandatory_t*)wtap_block_get_mandatory_data(int_data);
pcapng_debug("pcapng_write_if_descr_block: encap = %d (%s), snaplen = %d",
mand_data->link_type,
wtap_encap_string(wtap_pcap_encap_to_wtap_encap(mand_data->link_type)),
mand_data->snap_len);
if (mand_data->link_type == (guint16)-1) {
*err = WTAP_ERR_UNWRITABLE_ENCAP;
return FALSE;
}
/* Compute block size */
block_size.size = 0;
wtap_block_foreach_option(int_data, compute_idb_option_size, &block_size);
if (block_size.size > 0) {
/* End-of-options tag */
block_size.size += 4;
}
/* write block header */
bh.block_type = BLOCK_TYPE_IDB;
bh.block_total_length = (guint32)(sizeof(bh) + sizeof(idb) + block_size.size + 4);
pcapng_debug("pcapng_write_if_descr_block: Total len %u", bh.block_total_length);
if (!wtap_dump_file_write(wdh, &bh, sizeof bh, err))
return FALSE;
wdh->bytes_dumped += sizeof bh;
/* write block fixed content */
idb.linktype = mand_data->link_type;
idb.reserved = 0;
idb.snaplen = mand_data->snap_len;
if (!wtap_dump_file_write(wdh, &idb, sizeof idb, err))
return FALSE;
wdh->bytes_dumped += sizeof idb;
if (block_size.size > 0) {
/* Write options */
block_data.wdh = wdh;
block_data.err = err;
block_data.success = TRUE;
wtap_block_foreach_option(int_data, write_wtap_idb_option, &block_data);
if (!block_data.success)
return FALSE;
/* Write end of options */
option_hdr.type = OPT_EOFOPT;
option_hdr.value_length = 0;
if (!wtap_dump_file_write(wdh, &option_hdr, 4, err))
return FALSE;
wdh->bytes_dumped += 4;
}
/* write block footer */
if (!wtap_dump_file_write(wdh, &bh.block_total_length,
sizeof bh.block_total_length, err))
return FALSE;
wdh->bytes_dumped += sizeof bh.block_total_length;
return TRUE;
}
static gboolean pcapng_dump(wtap_dumper *wdh,
const struct wtap_pkthdr *phdr,
const guint8 *pd, int *err, gchar **err_info _U_)
{
const union wtap_pseudo_header *pseudo_header = &phdr->pseudo_header;
#ifdef HAVE_PLUGINS
block_handler *handler;
#endif
pcapng_debug("pcapng_dump: encap = %d (%s)",
phdr->pkt_encap,
wtap_encap_string(phdr->pkt_encap));
switch (phdr->rec_type) {
case REC_TYPE_PACKET:
if (!pcapng_write_enhanced_packet_block(wdh, phdr, pseudo_header, pd, err)) {
return FALSE;
}
break;
case REC_TYPE_FT_SPECIFIC_EVENT:
case REC_TYPE_FT_SPECIFIC_REPORT:
#ifdef HAVE_PLUGINS
/*
* Do we have a handler for this block type?
*/
if (block_handlers != NULL &&
(handler = (block_handler *)g_hash_table_lookup(block_handlers,
GUINT_TO_POINTER(pseudo_header->ftsrec.record_type))) != NULL) {
/* Yes. Call it to write out this record. */
if (!handler->writer(wdh, phdr, pd, err))
return FALSE;
} else
#endif
{
/* No. */
*err = WTAP_ERR_UNWRITABLE_REC_TYPE;
return FALSE;
}
break;
case REC_TYPE_SYSCALL:
if (!pcapng_write_sysdig_event_block(wdh, phdr, pseudo_header, pd, err)) {
return FALSE;
}
break;
default:
/* We don't support writing this record type. */
*err = WTAP_ERR_UNWRITABLE_REC_TYPE;
return FALSE;
}
return TRUE;
}
/* Finish writing to a dump file.
Returns TRUE on success, FALSE on failure. */
static gboolean pcapng_dump_finish(wtap_dumper *wdh, int *err)
{
guint i, j;
/* Flush any hostname resolution info we may have */
pcapng_write_name_resolution_block(wdh, err);
for (i = 0; i < wdh->interface_data->len; i++) {
/* Get the interface description */
wtap_block_t int_data;
wtapng_if_descr_mandatory_t *int_data_mand;
int_data = g_array_index(wdh->interface_data, wtap_block_t, i);
int_data_mand = (wtapng_if_descr_mandatory_t*)wtap_block_get_mandatory_data(int_data);
for (j = 0; j < int_data_mand->num_stat_entries; j++) {
wtap_block_t if_stats;
if_stats = g_array_index(int_data_mand->interface_statistics, wtap_block_t, j);
pcapng_debug("pcapng_dump_finish: write ISB for interface %u", ((wtapng_if_stats_mandatory_t*)wtap_block_get_mandatory_data(if_stats))->interface_id);
if (!pcapng_write_interface_statistics_block(wdh, if_stats, err)) {
return FALSE;
}
}
}
pcapng_debug("pcapng_dump_finish");
return TRUE;
}
/* Returns TRUE on success, FALSE on failure; sets "*err" to an error code on
failure */
gboolean
pcapng_dump_open(wtap_dumper *wdh, int *err)
{
guint i;
pcapng_debug("pcapng_dump_open");
/* This is a pcapng file */
wdh->subtype_write = pcapng_dump;
wdh->subtype_finish = pcapng_dump_finish;
if (wdh->interface_data->len == 0) {
pcapng_debug("There are no interfaces. Can't handle that...");
*err = WTAP_ERR_INTERNAL;
return FALSE;
}
/* write the section header block */
if (!pcapng_write_section_header_block(wdh, err)) {
return FALSE;
}
pcapng_debug("pcapng_dump_open: wrote section header block.");
/* Write the Interface description blocks */
pcapng_debug("pcapng_dump_open: Number of IDB:s to write (number of interfaces) %u",
wdh->interface_data->len);
for (i = 0; i < wdh->interface_data->len; i++) {
/* Get the interface description */
wtap_block_t idb;
idb = g_array_index(wdh->interface_data, wtap_block_t, i);
if (!pcapng_write_if_descr_block(wdh, idb, err)) {
return FALSE;
}
}
return TRUE;
}
/* Returns 0 if we could write the specified encapsulation type,
an error indication otherwise. */
int pcapng_dump_can_write_encap(int wtap_encap)
{
pcapng_debug("pcapng_dump_can_write_encap: encap = %d (%s)",
wtap_encap,
wtap_encap_string(wtap_encap));
/* Per-packet encapsulation is supported. */
if (wtap_encap == WTAP_ENCAP_PER_PACKET)
return 0;
/* Make sure we can figure out this DLT type */
if (wtap_wtap_encap_to_pcap_encap(wtap_encap) == -1)
return WTAP_ERR_UNWRITABLE_ENCAP;
return 0;
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/