![Guy Harris](/assets/img/avatar_default.png)
Otherwise, if you link with both libwiretap and libfiletap, it's anybody's guess which one you get. That means you're wasting memory with two copies of its routines if they're identical, and means surprising behavior if they're not (which showed up when I was debugging a double-free crash - fixing libwiretap's buffer_free() didn't fix the problem, because Wireshark happened to be calling libfiletap' unfixed buffer_free()). There's nothing *tap-specific about Buffers, anyway, so it really belongs in wsutil. Change-Id: I91537e46917e91277981f8f3365a2c0873152870 Reviewed-on: https://code.wireshark.org/review/3066 Reviewed-by: Guy Harris <guy@alum.mit.edu>
244 lines
6.4 KiB
C
244 lines
6.4 KiB
C
/* i4btrace.c
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*
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* Wiretap Library
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* Copyright (c) 1999 by Bert Driehuis <driehuis@playbeing.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include "wtap-int.h"
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#include "file_wrappers.h"
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#include <wsutil/buffer.h>
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#include "i4b_trace.h"
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#include "i4btrace.h"
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typedef struct {
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gboolean byte_swapped;
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} i4btrace_t;
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static gboolean i4btrace_read(wtap *wth, int *err, gchar **err_info,
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gint64 *data_offset);
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static gboolean i4btrace_seek_read(wtap *wth, gint64 seek_off,
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struct wtap_pkthdr *phdr, Buffer *buf, int *err, gchar **err_info);
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static int i4b_read_rec(wtap *wth, FILE_T fh, struct wtap_pkthdr *phdr,
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Buffer *buf, int *err, gchar **err_info);
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/*
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* Test some fields in the header to see if they make sense.
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*/
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#define I4B_HDR_IS_OK(hdr) \
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(!((unsigned int)hdr.length < 3 || (unsigned int)hdr.length > 16384 || \
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(unsigned int)hdr.unit > 4 || (unsigned int)hdr.type > 4 || \
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(unsigned int)hdr.dir > 2 || (unsigned int)hdr.trunc > 2048))
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int i4btrace_open(wtap *wth, int *err, gchar **err_info)
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{
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int bytes_read;
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i4b_trace_hdr_t hdr;
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gboolean byte_swapped = FALSE;
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i4btrace_t *i4btrace;
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/* I4B trace files have no magic in the header... Sigh */
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(&hdr, sizeof(hdr), wth->fh);
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if (bytes_read != sizeof(hdr)) {
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*err = file_error(wth->fh, err_info);
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if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
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return -1;
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return 0;
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}
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/* Silly heuristic... */
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if (!I4B_HDR_IS_OK(hdr)) {
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/*
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* OK, try byte-swapping the header fields.
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*/
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hdr.length = GUINT32_SWAP_LE_BE(hdr.length);
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hdr.unit = GUINT32_SWAP_LE_BE(hdr.unit);
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hdr.type = GUINT32_SWAP_LE_BE(hdr.type);
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hdr.dir = GUINT32_SWAP_LE_BE(hdr.dir);
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hdr.trunc = GUINT32_SWAP_LE_BE(hdr.trunc);
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if (!I4B_HDR_IS_OK(hdr)) {
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/*
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* It doesn't look valid in either byte order.
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*/
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return 0;
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}
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/*
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* It looks valid byte-swapped, so assume it's a
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* trace written in the opposite byte order.
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*/
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byte_swapped = TRUE;
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}
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if (file_seek(wth->fh, 0, SEEK_SET, err) == -1)
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return -1;
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/* Get capture start time */
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wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_I4BTRACE;
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i4btrace = (i4btrace_t *)g_malloc(sizeof(i4btrace_t));
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wth->priv = (void *)i4btrace;
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wth->subtype_read = i4btrace_read;
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wth->subtype_seek_read = i4btrace_seek_read;
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wth->snapshot_length = 0; /* not known */
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i4btrace->byte_swapped = byte_swapped;
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wth->file_encap = WTAP_ENCAP_ISDN;
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wth->tsprecision = WTAP_FILE_TSPREC_USEC;
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return 1;
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}
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/* Read the next packet */
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static gboolean i4btrace_read(wtap *wth, int *err, gchar **err_info,
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gint64 *data_offset)
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{
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*data_offset = file_tell(wth->fh);
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return i4b_read_rec(wth, wth->fh, &wth->phdr, wth->frame_buffer,
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err, err_info);
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}
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static gboolean
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i4btrace_seek_read(wtap *wth, gint64 seek_off, struct wtap_pkthdr *phdr,
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Buffer *buf, int *err, gchar **err_info)
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{
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if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
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return FALSE;
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if (!i4b_read_rec(wth, wth->random_fh, phdr, buf, err, err_info)) {
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/* Read error or EOF */
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if (*err == 0) {
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/* EOF means "short read" in random-access mode */
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*err = WTAP_ERR_SHORT_READ;
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}
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return FALSE;
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}
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return TRUE;
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}
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static gboolean
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i4b_read_rec(wtap *wth, FILE_T fh, struct wtap_pkthdr *phdr, Buffer *buf,
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int *err, gchar **err_info)
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{
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i4btrace_t *i4btrace = (i4btrace_t *)wth->priv;
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i4b_trace_hdr_t hdr;
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int bytes_read;
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guint32 length;
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(&hdr, sizeof hdr, fh);
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if (bytes_read != sizeof hdr) {
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*err = file_error(fh, err_info);
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if (*err == 0 && bytes_read != 0) {
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/* Read something, but not enough */
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*err = WTAP_ERR_SHORT_READ;
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}
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return FALSE;
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}
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if (i4btrace->byte_swapped) {
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/*
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* Byte-swap the header.
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*/
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hdr.length = GUINT32_SWAP_LE_BE(hdr.length);
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hdr.unit = GUINT32_SWAP_LE_BE(hdr.unit);
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hdr.type = GUINT32_SWAP_LE_BE(hdr.type);
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hdr.dir = GUINT32_SWAP_LE_BE(hdr.dir);
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hdr.trunc = GUINT32_SWAP_LE_BE(hdr.trunc);
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hdr.count = GUINT32_SWAP_LE_BE(hdr.count);
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hdr.ts_sec = GUINT32_SWAP_LE_BE(hdr.ts_sec);
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hdr.ts_usec = GUINT32_SWAP_LE_BE(hdr.ts_usec);
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}
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if (hdr.length < sizeof(hdr)) {
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*err = WTAP_ERR_BAD_FILE; /* record length < header! */
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*err_info = g_strdup_printf("i4btrace: record length %u < header length %lu",
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hdr.length, (unsigned long)sizeof(hdr));
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return FALSE;
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}
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length = hdr.length - (guint32)sizeof(hdr);
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if (length > WTAP_MAX_PACKET_SIZE) {
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/*
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* Probably a corrupt capture file; don't blow up trying
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* to allocate space for an immensely-large packet.
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*/
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf("i4btrace: File has %u-byte packet, bigger than maximum of %u",
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length, WTAP_MAX_PACKET_SIZE);
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return FALSE;
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}
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phdr->rec_type = REC_TYPE_PACKET;
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phdr->presence_flags = WTAP_HAS_TS;
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phdr->len = length;
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phdr->caplen = length;
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phdr->ts.secs = hdr.ts_sec;
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phdr->ts.nsecs = hdr.ts_usec * 1000;
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switch (hdr.type) {
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case TRC_CH_I:
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/*
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* XXX - what is it? It's probably not WTAP_ENCAP_NULL,
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* as that means it has a 4-byte AF_ type as the
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* encapsulation header.
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*/
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phdr->pkt_encap = WTAP_ENCAP_NULL;
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break;
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case TRC_CH_D:
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/*
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* D channel, so it's LAPD; set "p2p.sent".
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*/
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phdr->pkt_encap = WTAP_ENCAP_ISDN;
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phdr->pseudo_header.isdn.channel = 0;
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break;
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case TRC_CH_B1:
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/*
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* B channel 1.
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*/
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phdr->pkt_encap = WTAP_ENCAP_ISDN;
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phdr->pseudo_header.isdn.channel = 1;
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break;
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case TRC_CH_B2:
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/*
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* B channel 2.
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*/
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phdr->pkt_encap = WTAP_ENCAP_ISDN;
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phdr->pseudo_header.isdn.channel = 2;
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break;
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}
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phdr->pseudo_header.isdn.uton = (hdr.dir == FROM_TE);
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/*
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* Read the packet data.
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*/
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return wtap_read_packet_bytes(fh, buf, length, err, err_info);
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}
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