forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
reading the capture file. Have callers of "wtap_snapshot_length()" treat a value of 0 as "unknown", and default to WTAP_MAX_PACKET_SIZE (so that, when writing a capture file in a format that *does* store the snapshot length, we can at least put *something* in the file). If we don't know the snapshot length of the current capture file, don't display a value in the summary window. Don't use "cfile.snap" as the snapshot length option when capturing - doing so causes Ethereal to default, when capturing, to the snapshot length of the last capture file that you read in, rather than to the snapshot length of the last capture you did (or the initial default of "no snapshot length"). Redo the "Capture Options" dialog box to group options into sections with frames around them, and add units to the snapshot length, maximum file size, and capture duration options, as per a suggestion by Ulf Lamping. Also add units to the capture count option. Make the snapshot length, capture count, maximum file size, and capture duration options into a combination of a check box and a spin button. If the check box is not checked, the limit in question is inactive (snapshot length of 65535, no max packet count, no max file size, no max capture duration); if it's checked, the spinbox specifies the limit. Default all of the check boxes to "not checked" and all of the spin boxes to small values. Use "gtk_toggle_button_get_active()" rather than directly fetching the state of a check box. svn path=/trunk/; revision=4709
335 lines
8.1 KiB
C
335 lines
8.1 KiB
C
/* i4btrace.c
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*
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* $Id: i4btrace.c,v 1.16 2002/02/08 10:07:40 guy Exp $
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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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 "buffer.h"
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#include "i4b_trace.h"
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static gboolean i4btrace_read(wtap *wth, int *err, long *data_offset);
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static int i4btrace_seek_read(wtap *wth, long seek_off,
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union wtap_pseudo_header *pseudo_header, u_char *pd, int length);
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static int i4b_read_rec_header(FILE_T fh, i4b_trace_hdr_t *hdr, int *err);
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static void i4b_byte_swap_header(wtap *wth, i4b_trace_hdr_t *hdr);
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static int i4b_read_rec_data(FILE_T fh, u_char *pd, int length, int *err);
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static void i4b_set_pseudo_header(wtap *wth, i4b_trace_hdr_t *hdr,
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union wtap_pseudo_header *pseudo_header);
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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)hdr.length < 3 || (unsigned)hdr.unit > 4 || \
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(unsigned)hdr.type > 4 || (unsigned)hdr.dir > 2 || \
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(unsigned)hdr.trunc > 2048))
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int i4btrace_open(wtap *wth, int *err)
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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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/* 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, 1, sizeof(hdr), wth->fh);
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if (bytes_read != sizeof(hdr)) {
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*err = file_error(wth->fh);
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if (*err != 0)
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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 = BSWAP32(hdr.length);
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hdr.unit = BSWAP32(hdr.unit);
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hdr.type = BSWAP32(hdr.type);
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hdr.dir = BSWAP32(hdr.dir);
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hdr.trunc = BSWAP32(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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file_seek(wth->fh, 0, SEEK_SET);
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wth->data_offset = 0;
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/* Get capture start time */
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wth->file_type = WTAP_FILE_I4BTRACE;
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wth->capture.i4btrace = g_malloc(sizeof(i4btrace_t));
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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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wth->capture.i4btrace->bchannel_prot[0] = -1;
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wth->capture.i4btrace->bchannel_prot[1] = -1;
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wth->capture.i4btrace->byte_swapped = byte_swapped;
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wth->file_encap = WTAP_ENCAP_PER_PACKET;
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return 1;
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}
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#define V120SABME "\010\001\177"
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/* Read the next packet */
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static gboolean i4btrace_read(wtap *wth, int *err, long *data_offset)
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{
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int ret;
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i4b_trace_hdr_t hdr;
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guint16 length;
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void *bufp;
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int channel;
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/* Read record header. */
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*data_offset = wth->data_offset;
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ret = i4b_read_rec_header(wth->fh, &hdr, err);
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if (ret <= 0) {
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/* Read error or EOF */
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return FALSE;
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}
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wth->data_offset += sizeof hdr;
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i4b_byte_swap_header(wth, &hdr);
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if (hdr.length < sizeof(hdr)) {
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*err = WTAP_ERR_BAD_RECORD; /* record length < header! */
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return FALSE;
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}
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length = hdr.length - sizeof(hdr);
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wth->phdr.len = length;
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wth->phdr.caplen = length;
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wth->phdr.ts.tv_sec = hdr.time.tv_sec;
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wth->phdr.ts.tv_usec = hdr.time.tv_usec;
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/*
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* Read the packet data.
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*/
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buffer_assure_space(wth->frame_buffer, length);
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bufp = buffer_start_ptr(wth->frame_buffer);
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if (i4b_read_rec_data(wth->fh, bufp, length, err) < 0)
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return FALSE; /* Read error */
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wth->data_offset += length;
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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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wth->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.
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*/
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wth->phdr.pkt_encap = WTAP_ENCAP_LAPD;
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break;
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case TRC_CH_B1:
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case TRC_CH_B2:
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/*
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* B channel, so it could be any of a number of things.
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*/
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channel = hdr.type - TRC_CH_B1;
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if (wth->capture.i4btrace->bchannel_prot[channel] == -1) {
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/*
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* We don't know yet whether the datastream is
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* V.120 or not; this heuristic tries to figure
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* that out.
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*
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* We cannot glean this from the Q.931 SETUP message,
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* because no commercial V.120 implementation I've
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* seen actually sets the V.120 protocol discriminator
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* (that, or I'm misreading the spec badly).
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*
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* TODO: reset the flag to -1 (unknown) after a close
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* on the B channel is detected.
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*/
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if (memcmp(bufp, V120SABME, 3) == 0)
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wth->capture.i4btrace->bchannel_prot[channel] = 1;
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else
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wth->capture.i4btrace->bchannel_prot[channel] = 0;
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}
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if (wth->capture.i4btrace->bchannel_prot[channel] == 1) {
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/*
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* V.120.
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*/
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wth->phdr.pkt_encap = WTAP_ENCAP_V120;
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} else {
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/*
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* Not V.120.
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*
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* XXX - what is it? It's probably not
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* WTAP_ENCAP_NULL, as that means it has a
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* 4-byte AF_ type as the encapsulation header.
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* If it's PPP, we should use WTAP_ENCAP_PPP here.
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*/
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wth->phdr.pkt_encap = WTAP_ENCAP_NULL;
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}
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break;
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}
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i4b_set_pseudo_header(wth, &hdr, &wth->pseudo_header);
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return TRUE;
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}
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static int
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i4btrace_seek_read(wtap *wth, long seek_off,
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union wtap_pseudo_header *pseudo_header, u_char *pd, int length)
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{
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int ret;
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int err; /* XXX - return this */
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i4b_trace_hdr_t hdr;
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file_seek(wth->random_fh, seek_off, SEEK_SET);
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/* Read record header. */
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ret = i4b_read_rec_header(wth->random_fh, &hdr, &err);
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if (ret <= 0) {
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/* Read error or EOF */
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return ret;
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}
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i4b_byte_swap_header(wth, &hdr);
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i4b_set_pseudo_header(wth, &hdr, pseudo_header);
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/*
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* Read the packet data.
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*/
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return i4b_read_rec_data(wth->random_fh, pd, length, &err);
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}
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static int
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i4b_read_rec_header(FILE_T fh, i4b_trace_hdr_t *hdr, int *err)
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{
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int bytes_read;
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(hdr, 1, sizeof *hdr, fh);
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if (bytes_read != sizeof *hdr) {
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*err = file_error(fh);
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if (*err != 0)
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return -1;
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if (bytes_read != 0) {
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*err = WTAP_ERR_SHORT_READ;
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return -1;
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}
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return 0;
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}
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return 1;
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}
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static void
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i4b_byte_swap_header(wtap *wth, i4b_trace_hdr_t *hdr)
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{
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if (wth->capture.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 = BSWAP32(hdr->length);
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hdr->unit = BSWAP32(hdr->unit);
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hdr->type = BSWAP32(hdr->type);
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hdr->dir = BSWAP32(hdr->dir);
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hdr->trunc = BSWAP32(hdr->trunc);
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hdr->count = BSWAP32(hdr->count);
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hdr->time.tv_sec = BSWAP32(hdr->time.tv_sec);
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hdr->time.tv_usec = BSWAP32(hdr->time.tv_usec);
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}
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}
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static int
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i4b_read_rec_data(FILE_T fh, u_char *pd, int length, int *err)
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{
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int bytes_read;
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(pd, 1, length, fh);
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if (bytes_read != length) {
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*err = file_error(fh);
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if (*err == 0)
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*err = WTAP_ERR_SHORT_READ;
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return -1;
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}
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return 0;
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}
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static void
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i4b_set_pseudo_header(wtap *wth, i4b_trace_hdr_t *hdr,
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union wtap_pseudo_header *pseudo_header)
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{
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int channel;
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switch (hdr->type) {
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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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pseudo_header->p2p.sent = (hdr->dir == FROM_TE) ? TRUE : FALSE;
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break;
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case TRC_CH_B1:
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case TRC_CH_B2:
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/*
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* B channel, so it could be any of a number of things;
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* if it's V.120, set "x25.flags".
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*/
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channel = hdr->type - TRC_CH_B1;
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if (wth->capture.i4btrace->bchannel_prot[channel] == 1) {
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/*
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* V.120.
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*/
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pseudo_header->x25.flags =
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(hdr->dir == FROM_TE) ? 0x00 : 0x80;
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}
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break;
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}
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}
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