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pcapio.c
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/* pcapio.c
* Our own private code for writing libpcap files when capturing.
*
* We have these because we want a way to open a stream for output given
* only a file descriptor. libpcap 0.9[.x] has "pcap_dump_fopen()", which
* provides that, but
*
* 1) earlier versions of libpcap doesn't have it
*
* and
*
* 2) WinPcap/Npcap don't have it, because a file descriptor opened
* by code built for one version of the MSVC++ C library
* can't be used by library routines built for another version
* (e.g., threaded vs. unthreaded).
*
* Libpcap's pcap_dump() also doesn't return any error indications.
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <[email protected]>
* Copyright 1998 Gerald Combs
*
* Derived from code in the Wiretap Library
* Copyright (c) 1998 by Gilbert Ramirez <[email protected]>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <config.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef _WIN32
#include <windows.h>
#endif
#include <glib.h>
#include <wsutil/epochs.h>
#include <wsutil/file_util.h>
#include "pcapio.h"
#include <wiretap/file_wrappers.h>
typedef void* WFILE_T;
struct pcapio_writer {
WFILE_T fh;
char* io_buffer;
wtap_compression_type ctype;
};
/* Magic numbers in "libpcap" files.
"libpcap" file records are written in the byte order of the host that
writes them, and the reader is expected to fix this up.
PCAP_MAGIC is the magic number, in host byte order; PCAP_SWAPPED_MAGIC
is a byte-swapped version of that.
PCAP_NSEC_MAGIC is for Ulf Lamping's modified "libpcap" format,
which uses the same common file format as PCAP_MAGIC, but the
timestamps are saved in nanosecond resolution instead of microseconds.
PCAP_SWAPPED_NSEC_MAGIC is a byte-swapped version of that. */
#define PCAP_MAGIC 0xa1b2c3d4
#define PCAP_SWAPPED_MAGIC 0xd4c3b2a1
#define PCAP_NSEC_MAGIC 0xa1b23c4d
#define PCAP_SWAPPED_NSEC_MAGIC 0x4d3cb2a1
/* "libpcap" file header. */
struct pcap_hdr {
uint32_t magic; /* magic number */
uint16_t version_major; /* major version number */
uint16_t version_minor; /* minor version number */
int32_t thiszone; /* GMT to local correction */
uint32_t sigfigs; /* accuracy of timestamps */
uint32_t snaplen; /* max length of captured packets, in octets */
uint32_t network; /* data link type */
};
/* "libpcap" record header. */
struct pcaprec_hdr {
uint32_t ts_sec; /* timestamp seconds */
uint32_t ts_usec; /* timestamp microseconds (nsecs for PCAP_NSEC_MAGIC) */
uint32_t incl_len; /* number of octets of packet saved in file */
uint32_t orig_len; /* actual length of packet */
};
/* Magic numbers in ".pcapng" files.
*
* .pcapng file records are written in the byte order of the host that
* writes them, and the reader is expected to fix this up.
* PCAPNG_MAGIC is the magic number, in host byte order;
* PCAPNG_SWAPPED_MAGIC is a byte-swapped version of that.
*/
#define PCAPNG_MAGIC 0x1A2B3C4D
#define PCAPNG_SWAPPED_MAGIC 0x4D3C2B1A
/* Currently we are only supporting the initial version of
the file format. */
#define PCAPNG_MAJOR_VERSION 1
#define PCAPNG_MINOR_VERSION 0
/* Section Header Block without options and trailing Block Total Length */
struct shb {
uint32_t block_type;
uint32_t block_total_length;
uint32_t byte_order_magic;
uint16_t major_version;
uint16_t minor_version;
uint64_t section_length;
};
#define SECTION_HEADER_BLOCK_TYPE 0x0A0D0D0A
/* Interface Description Block without options and trailing Block Total Length */
struct idb {
uint32_t block_type;
uint32_t block_total_length;
uint16_t link_type;
uint16_t reserved;
uint32_t snap_len;
};
#define INTERFACE_DESCRIPTION_BLOCK_TYPE 0x00000001
/* Interface Statistics Block without actual packet, options, and trailing
Block Total Length */
struct isb {
uint32_t block_type;
uint32_t block_total_length;
uint32_t interface_id;
uint32_t timestamp_high;
uint32_t timestamp_low;
};
#define INTERFACE_STATISTICS_BLOCK_TYPE 0x00000005
/* Enhanced Packet Block without actual packet, options, and trailing
Block Total Length */
struct epb {
uint32_t block_type;
uint32_t block_total_length;
uint32_t interface_id;
uint32_t timestamp_high;
uint32_t timestamp_low;
uint32_t captured_len;
uint32_t packet_len;
};
#define ENHANCED_PACKET_BLOCK_TYPE 0x00000006
struct ws_option {
uint16_t type;
uint16_t value_length;
};
#define OPT_ENDOFOPT 0
#define OPT_COMMENT 1
#define EPB_FLAGS 2
#define SHB_HARDWARE 2 /* currently not used */
#define SHB_OS 3
#define SHB_USERAPPL 4
#define IDB_NAME 2
#define IDB_DESCRIPTION 3
#define IDB_IF_SPEED 8
#define IDB_TSRESOL 9
#define IDB_FILTER 11
#define IDB_OS 12
#define IDB_HARDWARE 15
#define ISB_STARTTIME 2
#define ISB_ENDTIME 3
#define ISB_IFRECV 4
#define ISB_IFDROP 5
#define ISB_FILTERACCEPT 6
#define ISB_OSDROP 7
#define ISB_USRDELIV 8
#define ADD_PADDING(x) ((((x) + 3) >> 2) << 2)
static WFILE_T
writecap_file_open(pcapio_writer* pfile, const char *filename)
{
WFILE_T fh;
switch (pfile->ctype) {
#if defined (HAVE_ZLIB) || defined (HAVE_ZLIBNG)
case WTAP_GZIP_COMPRESSED:
return gzwfile_open(filename);
#endif /* defined (HAVE_ZLIB) || defined (HAVE_ZLIBNG) */
#ifdef HAVE_LZ4FRAME_H
case WTAP_LZ4_COMPRESSED:
return lz4wfile_open(filename);
#endif /* HAVE_LZ4FRAME_H */
default:
fh = ws_fopen(filename, "wb");
/* Increase the size of the IO buffer if uncompressed.
* Compression has its own buffer that reduces writes.
*/
if (fh != NULL) {
size_t buffsize = IO_BUF_SIZE;
#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
ws_statb64 statb;
if (ws_stat64(filename, &statb) == 0) {
if (statb.st_blksize > IO_BUF_SIZE) {
buffsize = statb.st_blksize;
}
}
#endif
pfile->io_buffer = (char *)g_malloc(buffsize);
setvbuf(fh, pfile->io_buffer, _IOFBF, buffsize);
//ws_debug("buffsize %zu", buffsize);
}
return fh;
}
}
static WFILE_T
writecap_file_fdopen(pcapio_writer* pfile, int fd)
{
WFILE_T fh;
switch (pfile->ctype) {
#if defined (HAVE_ZLIB) || defined (HAVE_ZLIBNG)
case WTAP_GZIP_COMPRESSED:
return gzwfile_fdopen(fd);
#endif /* defined (HAVE_ZLIB) || defined (HAVE_ZLIBNG) */
#ifdef HAVE_LZ4FRAME_H
case WTAP_LZ4_COMPRESSED:
return lz4wfile_fdopen(fd);
#endif /* HAVE_LZ4FRAME_H */
default:
fh = ws_fdopen(fd, "wb");
/* Increase the size of the IO buffer if uncompressed.
* Compression has its own buffer that reduces writes.
*/
if (fh != NULL) {
size_t buffsize = IO_BUF_SIZE;
#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
ws_statb64 statb;
if (ws_fstat64(fd, &statb) == 0) {
if (statb.st_blksize > IO_BUF_SIZE) {
buffsize = statb.st_blksize;
}
}
#endif
pfile->io_buffer = (char *)g_malloc(buffsize);
setvbuf(fh, pfile->io_buffer, _IOFBF, buffsize);
//ws_debug("buffsize %zu", buffsize);
}
return fh;
}
}
pcapio_writer*
writecap_fopen(const char *filename, wtap_compression_type ctype, int *err)
{
pcapio_writer* pfile;
*err = 0;
pfile = g_new0(struct pcapio_writer, 1);
if (pfile == NULL) {
*err = errno;
return NULL;
}
pfile->ctype = ctype;
errno = WTAP_ERR_CANT_OPEN;
void* fh = writecap_file_open(pfile, filename);
if (fh == NULL) {
*err = errno;
g_free(pfile);
return NULL;
}
pfile->fh = fh;
return pfile;
}
pcapio_writer*
writecap_fdopen(int fd, wtap_compression_type ctype, int *err)
{
pcapio_writer* pfile;
*err = 0;
pfile = g_new0(struct pcapio_writer, 1);
if (pfile == NULL) {
*err = errno;
return NULL;
}
pfile->ctype = ctype;
errno = WTAP_ERR_CANT_OPEN;
WFILE_T fh = writecap_file_fdopen(pfile, fd);
if (fh == NULL) {
*err = errno;
g_free(pfile);
return NULL;
}
pfile->fh = fh;
return pfile;
}
pcapio_writer*
writecap_open_stdout(wtap_compression_type ctype, int *err)
{
int new_fd;
pcapio_writer* pfile;
new_fd = ws_dup(1);
if (new_fd == -1) {
*err = errno;
return NULL;
}
#ifdef _WIN32
/*
* Put the new descriptor into binary mode.
*
* XXX - even if the file format we're writing is a text
* format?
*/
if (_setmode(new_fd, O_BINARY) == -1) {
/* "Should not happen" */
*err = errno;
ws_close(new_fd);
return NULL;
}
#endif
pfile = writecap_fdopen(new_fd, ctype, err);
if (pfile == NULL) {
/* Failed; close the new fd */
ws_close(new_fd);
return NULL;
}
return pfile;
}
bool
writecap_flush(pcapio_writer* pfile, int *err)
{
switch (pfile->ctype) {
#if defined (HAVE_ZLIB) || defined (HAVE_ZLIBNG)
case WTAP_GZIP_COMPRESSED:
if (gzwfile_flush((GZWFILE_T)pfile->fh) == -1) {
if (err) {
*err = gzwfile_geterr((GZWFILE_T)pfile->fh);
}
return false;
}
break;
#endif
#ifdef HAVE_LZ4FRAME_H
case WTAP_LZ4_COMPRESSED:
if (lz4wfile_flush((LZ4WFILE_T)pfile->fh) == -1) {
if (err) {
*err = lz4wfile_geterr((LZ4WFILE_T)pfile->fh);
}
return false;
}
break;
#endif /* HAVE_LZ4FRAME_H */
default:
if (fflush((FILE*)pfile->fh) == EOF) {
if (err) {
*err = errno;
}
return false;
}
}
return true;
}
bool
writecap_close(pcapio_writer* pfile, int *errp)
{
int err = 0;
errno = WTAP_ERR_CANT_CLOSE;
switch (pfile->ctype) {
#if defined (HAVE_ZLIB) || defined (HAVE_ZLIBNG)
case WTAP_GZIP_COMPRESSED:
err = gzwfile_close(pfile->fh);
break;
#endif
#ifdef HAVE_LZ4FRAME_H
case WTAP_LZ4_COMPRESSED:
err = lz4wfile_close(pfile->fh);
break;
#endif /* HAVE_LZ4FRAME_H */
default:
if (fclose(pfile->fh) == EOF) {
err = errno;
}
}
g_free(pfile->io_buffer);
g_free(pfile);
if (errp) {
*errp = err;
}
return err == 0;
}
/* Write to capture file */
static bool
write_to_file(pcapio_writer* pfile, const uint8_t* data, size_t data_length,
uint64_t *bytes_written, int *err)
{
size_t nwritten;
switch (pfile->ctype) {
#if defined (HAVE_ZLIB) || defined (HAVE_ZLIBNG)
case WTAP_GZIP_COMPRESSED:
nwritten = gzwfile_write(pfile->fh, data, (unsigned)data_length);
/*
* gzwfile_write() returns 0 on error.
*/
if (nwritten == 0) {
*err = gzwfile_geterr(pfile->fh);
return false;
}
break;
#endif
#ifdef HAVE_LZ4FRAME_H
case WTAP_LZ4_COMPRESSED:
nwritten = lz4wfile_write(pfile->fh, data, data_length);
/*
* lz4wfile_write() returns 0 on error.
*/
if (nwritten == 0) {
*err = lz4wfile_geterr(pfile->fh);
return false;
}
break;
#endif /* HAVE_LZ4FRAME_H */
default:
nwritten = fwrite(data, data_length, 1, pfile->fh);
if (nwritten != 1) {
if (ferror(pfile->fh)) {
*err = errno;
} else {
*err = WTAP_ERR_SHORT_WRITE;
}
return false;
}
break;
}
(*bytes_written) += data_length;
return true;
}
/* Writing pcap files */
/* Write the file header to a dump file.
Returns true on success, false on failure.
Sets "*err" to an error code, or 0 for a short write, on failure*/
bool
libpcap_write_file_header(pcapio_writer* pfile, int linktype, int snaplen, bool ts_nsecs, uint64_t *bytes_written, int *err)
{
struct pcap_hdr file_hdr;
file_hdr.magic = ts_nsecs ? PCAP_NSEC_MAGIC : PCAP_MAGIC;
/* current "libpcap" format is 2.4 */
file_hdr.version_major = 2;
file_hdr.version_minor = 4;
file_hdr.thiszone = 0; /* XXX - current offset? */
file_hdr.sigfigs = 0; /* unknown, but also apparently unused */
file_hdr.snaplen = snaplen;
file_hdr.network = linktype;
return write_to_file(pfile, (const uint8_t*)&file_hdr, sizeof(file_hdr), bytes_written, err);
}
/* Write a record for a packet to a dump file.
Returns true on success, false on failure. */
bool
libpcap_write_packet(pcapio_writer* pfile,
time_t sec, uint32_t usec,
uint32_t caplen, uint32_t len,
const uint8_t *pd,
uint64_t *bytes_written, int *err)
{
struct pcaprec_hdr rec_hdr;
rec_hdr.ts_sec = (uint32_t)sec; /* Y2.038K issue in pcap format.... */
rec_hdr.ts_usec = usec;
rec_hdr.incl_len = caplen;
rec_hdr.orig_len = len;
if (!write_to_file(pfile, (const uint8_t*)&rec_hdr, sizeof(rec_hdr), bytes_written, err))
return false;
return write_to_file(pfile, pd, caplen, bytes_written, err);
}
/* Writing pcapng files */
static uint32_t
pcapng_count_string_option(const char *option_value)
{
if ((option_value != NULL) && (strlen(option_value) > 0) && (strlen(option_value) < UINT16_MAX)) {
/* There's a value to write; get its length */
return (uint32_t)(sizeof(struct ws_option) +
(uint16_t)ADD_PADDING(strlen(option_value)));
}
return 0; /* nothing to write */
}
static bool
pcapng_write_string_option(pcapio_writer* pfile,
uint16_t option_type, const char *option_value,
uint64_t *bytes_written, int *err)
{
size_t option_value_length;
struct ws_option option;
const uint32_t padding = 0;
if (option_value == NULL)
return true; /* nothing to write */
option_value_length = strlen(option_value);
if ((option_value_length > 0) && (option_value_length < UINT16_MAX)) {
/* something to write */
option.type = option_type;
option.value_length = (uint16_t)option_value_length;
if (!write_to_file(pfile, (const uint8_t*)&option, sizeof(struct ws_option), bytes_written, err))
return false;
if (!write_to_file(pfile, (const uint8_t*)option_value, (int) option_value_length, bytes_written, err))
return false;
if (option_value_length % 4) {
if (!write_to_file(pfile, (const uint8_t*)&padding, 4 - option_value_length % 4, bytes_written, err))
return false;
}
}
return true;
}
/* Write a pre-formatted pcapng block directly to the output file */
bool
pcapng_write_block(pcapio_writer* pfile,
const uint8_t *data,
uint32_t length,
uint64_t *bytes_written,
int *err)
{
uint32_t block_length, end_length;
/* Check
* - length and data are aligned to 4 bytes
* - block_total_length field is the same at the start and end of the block
*
* The block_total_length is not checked against the provided length but
* getting the trailing block_total_length from the length argument gives
* us an implicit check of correctness without needing to do an endian swap
*/
if (((length & 3) != 0) || (((intptr_t)data & 3) != 0)) {
*err = EINVAL;
return false;
}
block_length = *(const uint32_t *) (data+sizeof(uint32_t));
end_length = *(const uint32_t *) (data+length-sizeof(uint32_t));
if (block_length != end_length) {
*err = EBADMSG;
return false;
}
return write_to_file(pfile, data, length, bytes_written, err);
}
bool
pcapng_write_section_header_block(pcapio_writer* pfile,
GPtrArray *comments,
const char *hw,
const char *os,
const char *appname,
uint64_t section_length,
uint64_t *bytes_written,
int *err)
{
struct shb shb;
struct ws_option option;
uint32_t block_total_length;
uint32_t options_length;
/* Size of base header */
block_total_length = sizeof(struct shb) + sizeof(uint32_t);
options_length = 0;
if (comments != NULL) {
for (unsigned i = 0; i < comments->len; i++) {
options_length += pcapng_count_string_option((char *)g_ptr_array_index(comments, i));
}
}
options_length += pcapng_count_string_option(hw);
options_length += pcapng_count_string_option(os);
options_length += pcapng_count_string_option(appname);
/* If we have options add size of end-of-options */
if (options_length != 0) {
options_length += (uint32_t)sizeof(struct ws_option);
}
block_total_length += options_length;
/* write shb header */
shb.block_type = SECTION_HEADER_BLOCK_TYPE;
shb.block_total_length = block_total_length;
shb.byte_order_magic = PCAPNG_MAGIC;
shb.major_version = PCAPNG_MAJOR_VERSION;
shb.minor_version = PCAPNG_MINOR_VERSION;
shb.section_length = section_length;
if (!write_to_file(pfile, (const uint8_t*)&shb, sizeof(struct shb), bytes_written, err))
return false;
if (comments != NULL) {
for (unsigned i = 0; i < comments->len; i++) {
if (!pcapng_write_string_option(pfile, OPT_COMMENT,
(char *)g_ptr_array_index(comments, i),
bytes_written, err))
return false;
}
}
if (!pcapng_write_string_option(pfile, SHB_HARDWARE, hw,
bytes_written, err))
return false;
if (!pcapng_write_string_option(pfile, SHB_OS, os,
bytes_written, err))
return false;
if (!pcapng_write_string_option(pfile, SHB_USERAPPL, appname,
bytes_written, err))
return false;
if (options_length != 0) {
/* write end of options */
option.type = OPT_ENDOFOPT;
option.value_length = 0;
if (!write_to_file(pfile, (const uint8_t*)&option, sizeof(struct ws_option), bytes_written, err))
return false;
}
/* write the trailing block total length */
return write_to_file(pfile, (const uint8_t*)&block_total_length, sizeof(uint32_t), bytes_written, err);
}
bool
pcapng_write_interface_description_block(pcapio_writer* pfile,
const char *comment, /* OPT_COMMENT 1 */
const char *name, /* IDB_NAME 2 */
const char *descr, /* IDB_DESCRIPTION 3 */
const char *filter, /* IDB_FILTER 11 */
const char *os, /* IDB_OS 12 */
const char *hardware, /* IDB_HARDWARE 15 */
int link_type,
int snap_len,
uint64_t *bytes_written,
uint64_t if_speed, /* IDB_IF_SPEED 8 */
uint8_t tsresol, /* IDB_TSRESOL 9 */
int *err)
{
struct idb idb;
struct ws_option option;
uint32_t block_total_length;
uint32_t options_length;
const uint32_t padding = 0;
block_total_length = (uint32_t)(sizeof(struct idb) + sizeof(uint32_t));
options_length = 0;
/* 01 - OPT_COMMENT */
options_length += pcapng_count_string_option(comment);
/* 02 - IDB_NAME */
options_length += pcapng_count_string_option(name);
/* 03 - IDB_DESCRIPTION */
options_length += pcapng_count_string_option(descr);
/* 08 - IDB_IF_SPEED */
if (if_speed != 0) {
options_length += (uint32_t)(sizeof(struct ws_option) +
sizeof(uint64_t));
}
/* 09 - IDB_TSRESOL */
if (tsresol != 0) {
options_length += (uint32_t)(sizeof(struct ws_option) +
sizeof(struct ws_option));
}
/* 11 - IDB_FILTER */
if ((filter != NULL) && (strlen(filter) > 0) && (strlen(filter) < UINT16_MAX - 1)) {
/* No, this isn't a string, it has an extra type byte */
options_length += (uint32_t)(sizeof(struct ws_option) +
(uint16_t)(ADD_PADDING(strlen(filter)+ 1)));
}
/* 12 - IDB_OS */
options_length += pcapng_count_string_option(os);
/* 15 - IDB_HARDWARE */
options_length += pcapng_count_string_option(hardware);
/* If we have options add size of end-of-options */
if (options_length != 0) {
options_length += (uint32_t)sizeof(struct ws_option);
}
block_total_length += options_length;
/* write block header */
idb.block_type = INTERFACE_DESCRIPTION_BLOCK_TYPE;
idb.block_total_length = block_total_length;
idb.link_type = link_type;
idb.reserved = 0;
idb.snap_len = snap_len;
if (!write_to_file(pfile, (const uint8_t*)&idb, sizeof(struct idb), bytes_written, err))
return false;
/* 01 - OPT_COMMENT - write comment string if applicable */
if (!pcapng_write_string_option(pfile, OPT_COMMENT, comment,
bytes_written, err))
return false;
/* 02 - IDB_NAME - write interface name string if applicable */
if (!pcapng_write_string_option(pfile, IDB_NAME, name,
bytes_written, err))
return false;
/* 03 - IDB_DESCRIPTION */
/* write interface description string if applicable */
if (!pcapng_write_string_option(pfile, IDB_DESCRIPTION, descr,
bytes_written, err))
return false;
/* 08 - IDB_IF_SPEED */
if (if_speed != 0) {
option.type = IDB_IF_SPEED;
option.value_length = sizeof(uint64_t);
if (!write_to_file(pfile, (const uint8_t*)&option, sizeof(struct ws_option), bytes_written, err))
return false;
if (!write_to_file(pfile, (const uint8_t*)&if_speed, sizeof(uint64_t), bytes_written, err))
return false;
}
/* 09 - IDB_TSRESOL */
if (tsresol != 0) {
option.type = IDB_TSRESOL;
option.value_length = sizeof(uint8_t);
if (!write_to_file(pfile, (const uint8_t*)&option, sizeof(struct ws_option), bytes_written, err))
return false;
if (!write_to_file(pfile, (const uint8_t*)&tsresol, sizeof(uint8_t), bytes_written, err))
return false;
if (!write_to_file(pfile, (const uint8_t*)&padding, 3, bytes_written, err))
return false;
}
/* 11 - IDB_FILTER - write filter string if applicable
* We write out the libpcap filter expression, not the
* generated BPF code.
*/
if ((filter != NULL) && (strlen(filter) > 0) && (strlen(filter) < UINT16_MAX - 1)) {
option.type = IDB_FILTER;
option.value_length = (uint16_t)(strlen(filter) + 1 );
if (!write_to_file(pfile, (const uint8_t*)&option, sizeof(struct ws_option), bytes_written, err))
return false;
/* The first byte of the Option Data keeps a code of the filter used, 0 = lipbpcap filter string */
if (!write_to_file(pfile, (const uint8_t*)&padding, 1, bytes_written, err))
return false;
if (!write_to_file(pfile, (const uint8_t*)filter, (int) strlen(filter), bytes_written, err))
return false;
if ((strlen(filter) + 1) % 4) {
if (!write_to_file(pfile, (const uint8_t*)&padding, 4 - (strlen(filter) + 1) % 4, bytes_written, err))
return false;
}
}
/* 12 - IDB_OS - write os string if applicable */
if (!pcapng_write_string_option(pfile, IDB_OS, os,
bytes_written, err))
return false;
/* 15 - IDB_HARDWARE - write hardware string if applicable */
if (!pcapng_write_string_option(pfile, IDB_HARDWARE, hardware,
bytes_written, err))
return false;
if (options_length != 0) {
/* write end of options */
option.type = OPT_ENDOFOPT;
option.value_length = 0;
if (!write_to_file(pfile, (const uint8_t*)&option, sizeof(struct ws_option), bytes_written, err))
return false;
}
/* write the trailing Block Total Length */
return write_to_file(pfile, (const uint8_t*)&block_total_length, sizeof(uint32_t), bytes_written, err);
}
/* Write a record for a packet to a dump file.
Returns true on success, false on failure. */
bool
pcapng_write_enhanced_packet_block(pcapio_writer* pfile,
const char *comment,
time_t sec, uint32_t usec,
uint32_t caplen, uint32_t len,
uint32_t interface_id,
unsigned ts_mul,
const uint8_t *pd,
uint32_t flags,
uint64_t *bytes_written,
int *err)
{
struct epb epb;
struct ws_option option;
uint32_t block_total_length;
uint64_t timestamp;
uint32_t options_length;
const uint32_t padding = 0;
uint8_t buff[8];
uint8_t i;
uint8_t pad_len = 0;
block_total_length = (uint32_t)(sizeof(struct epb) +
ADD_PADDING(caplen) +
sizeof(uint32_t));
options_length = 0;
options_length += pcapng_count_string_option(comment);
if (flags != 0) {
options_length += (uint32_t)(sizeof(struct ws_option) +
sizeof(uint32_t));
}
/* If we have options add size of end-of-options */
if (options_length != 0) {
options_length += (uint32_t)sizeof(struct ws_option);
}
block_total_length += options_length;
timestamp = (uint64_t)sec * ts_mul + (uint64_t)usec;
epb.block_type = ENHANCED_PACKET_BLOCK_TYPE;
epb.block_total_length = block_total_length;
epb.interface_id = interface_id;
epb.timestamp_high = (uint32_t)((timestamp>>32) & 0xffffffff);
epb.timestamp_low = (uint32_t)(timestamp & 0xffffffff);
epb.captured_len = caplen;
epb.packet_len = len;
if (!write_to_file(pfile, (const uint8_t*)&epb, sizeof(struct epb), bytes_written, err))
return false;
if (!write_to_file(pfile, pd, caplen, bytes_written, err))
return false;
/* Use more efficient write in case of no "extras" */
if(caplen % 4) {
pad_len = 4 - (caplen % 4);
}
/*
* If we have no options to write, just write out the padding and
* the block total length with one fwrite() call.
*/
if(!comment && flags == 0 && options_length==0){
/* Put padding in the buffer */
for (i = 0; i < pad_len; i++) {
buff[i] = 0;
}
/* Write the total length */
memcpy(&buff[i], &block_total_length, sizeof(uint32_t));
i += sizeof(uint32_t);
return write_to_file(pfile, (const uint8_t*)&buff, i, bytes_written, err);
}
if (pad_len) {
if (!write_to_file(pfile, (const uint8_t*)&padding, pad_len, bytes_written, err))
return false;
}
if (!pcapng_write_string_option(pfile, OPT_COMMENT, comment,
bytes_written, err))
return false;
if (flags != 0) {
option.type = EPB_FLAGS;
option.value_length = sizeof(uint32_t);
if (!write_to_file(pfile, (const uint8_t*)&option, sizeof(struct ws_option), bytes_written, err))
return false;
if (!write_to_file(pfile, (const uint8_t*)&flags, sizeof(uint32_t), bytes_written, err))
return false;
}
if (options_length != 0) {
/* write end of options */
option.type = OPT_ENDOFOPT;
option.value_length = 0;
if (!write_to_file(pfile, (const uint8_t*)&option, sizeof(struct ws_option), bytes_written, err))
return false;
}
return write_to_file(pfile, (const uint8_t*)&block_total_length, sizeof(uint32_t), bytes_written, err);
}
bool
pcapng_write_interface_statistics_block(pcapio_writer* pfile,
uint32_t interface_id,
uint64_t *bytes_written,
const char *comment, /* OPT_COMMENT 1 */
uint64_t isb_starttime, /* ISB_STARTTIME 2 */
uint64_t isb_endtime, /* ISB_ENDTIME 3 */
uint64_t isb_ifrecv, /* ISB_IFRECV 4 */
uint64_t isb_ifdrop, /* ISB_IFDROP 5 */
int *err)
{
struct isb isb;
#ifdef _WIN32
FILETIME now;
#else
struct timeval now;
#endif
struct ws_option option;
uint32_t block_total_length;
uint32_t options_length;
uint64_t timestamp;
#ifdef _WIN32
/*
* Current time, represented as 100-nanosecond intervals since
* January 1, 1601, 00:00:00 UTC.
*
* I think DWORD might be signed, so cast both parts of "now"
* to uint32_t so that the sign bit doesn't get treated specially.
*
* Windows 8 provides GetSystemTimePreciseAsFileTime which we
* might want to use instead.
*/
GetSystemTimeAsFileTime(&now);
timestamp = (((uint64_t)(uint32_t)now.dwHighDateTime) << 32) +
(uint32_t)now.dwLowDateTime;
/*
* Convert to same thing but as 1-microsecond, i.e. 1000-nanosecond,
* intervals.
*/
timestamp /= 10;
/*
* Subtract difference, in microseconds, between January 1, 1601
* 00:00:00 UTC and January 1, 1970, 00:00:00 UTC.
*/
timestamp -= EPOCH_DELTA_1601_01_01_00_00_00_UTC*1000000;
#else
/*
* Current time, represented as seconds and microseconds since
* January 1, 1970, 00:00:00 UTC.
*/
gettimeofday(&now, NULL);
/*
* Convert to delta in microseconds.
*/
timestamp = (uint64_t)(now.tv_sec) * 1000000 +
(uint64_t)(now.tv_usec);
#endif
block_total_length = (uint32_t)(sizeof(struct isb) + sizeof(uint32_t));
options_length = 0;
if (isb_ifrecv != UINT64_MAX) {
options_length += (uint32_t)(sizeof(struct ws_option) +
sizeof(uint64_t));
}
if (isb_ifdrop != UINT64_MAX) {
options_length += (uint32_t)(sizeof(struct ws_option) +
sizeof(uint64_t));
}
/* OPT_COMMENT */
options_length += pcapng_count_string_option(comment);
if (isb_starttime !=0) {
options_length += (uint32_t)(sizeof(struct ws_option) +
sizeof(uint64_t)); /* ISB_STARTTIME */
}
if (isb_endtime !=0) {
options_length += (uint32_t)(sizeof(struct ws_option) +
sizeof(uint64_t)); /* ISB_ENDTIME */
}
/* If we have options add size of end-of-options */
if (options_length != 0) {
options_length += (uint32_t)sizeof(struct ws_option);
}
block_total_length += options_length;
isb.block_type = INTERFACE_STATISTICS_BLOCK_TYPE;
isb.block_total_length = block_total_length;
isb.interface_id = interface_id;
isb.timestamp_high = (uint32_t)((timestamp>>32) & 0xffffffff);
isb.timestamp_low = (uint32_t)(timestamp & 0xffffffff);
if (!write_to_file(pfile, (const uint8_t*)&isb, sizeof(struct isb), bytes_written, err))
return false;
/* write comment string if applicable */
if (!pcapng_write_string_option(pfile, OPT_COMMENT, comment,
bytes_written, err))
return false;
if (isb_starttime !=0) {
uint32_t high, low;
option.type = ISB_STARTTIME;
option.value_length = sizeof(uint64_t);
high = (uint32_t)((isb_starttime>>32) & 0xffffffff);