244 lines
5.4 KiB
C
244 lines
5.4 KiB
C
/* wtap.c
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*
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* $Id: wtap.c,v 1.40 2000/05/12 05:06:33 gram Exp $
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*
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* Wiretap Library
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* Copyright (c) 1998 by Gilbert Ramirez <gram@xiexie.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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#include <string.h>
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#include <errno.h>
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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 "wtap.h"
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#include "file_wrappers.h"
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#include "buffer.h"
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#include "ascend.h"
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#include "toshiba.h"
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FILE* wtap_file(wtap *wth)
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{
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return wth->fh;
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}
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int wtap_fd(wtap *wth)
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{
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return wth->fd;
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}
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int wtap_file_type(wtap *wth)
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{
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return wth->file_type;
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}
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int wtap_snapshot_length(wtap *wth)
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{
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return wth->snapshot_length;
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}
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int wtap_file_encap(wtap *wth)
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{
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return wth->file_encap;
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}
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/* Table of the encapsulation types we know about. */
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const static struct encap_type_info {
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const char *name;
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const char *short_name;
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} encap_table[WTAP_NUM_ENCAP_TYPES] = {
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/* WTAP_ENCAP_UNKNOWN */
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{ "Unknown", NULL },
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/* WTAP_ENCAP_ETHERNET */
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{ "Ethernet", "ether" },
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/* WTAP_ENCAP_TR */
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{ "Token Ring", "tr" },
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/* WTAP_ENCAP_SLIP */
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{ "SLIP", "slip" },
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/* WTAP_ENCAP_PPP */
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{ "PPP", "ppp" },
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/* WTAP_ENCAP_FDDI */
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{ "FDDI", "fddi" },
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/* WTAP_ENCAP_FDDI_BITSWAPPED */
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{ "FDDI with bit-swapped MAC addresses", "fddi-swapped" },
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/* WTAP_ENCAP_RAW_IP */
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{ "Raw IP", "rawip" },
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/* WTAP_ENCAP_ARCNET */
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{ "ARCNET", "arcnet" },
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/* WTAP_ENCAP_ATM_RFC1483 */
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{ "RFC 1483 ATM", "atm-rfc1483" },
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/* WTAP_ENCAP_LINUX_ATM_CLIP */
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{ "Linux ATM CLIP", "linux-atm-clip" },
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/* WTAP_ENCAP_LAPB */
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{ "LAPB", "lapb" },
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/* WTAP_ENCAP_ATM_SNIFFER */
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{ "ATM Sniffer", "atm-sniffer" },
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/* WTAP_ENCAP_NULL */
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{ "NULL", "null" },
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/* WTAP_ENCAP_ASCEND */
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{ "Lucent/Ascend access equipment", "ascend" },
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/* WTAP_ENCAP_LAPD */
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{ "LAPD", "lapd" },
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/* WTAP_ENCAP_V120 */
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{ "V.120", "v120" },
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};
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/* Name that should be somewhat descriptive. */
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const char *wtap_encap_string(int encap)
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{
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if (encap < 0 || encap >= WTAP_NUM_ENCAP_TYPES)
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return NULL;
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else
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return encap_table[encap].name;
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}
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/* Name to use in, say, a command-line flag specifying the type. */
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const char *wtap_encap_short_string(int encap)
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{
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if (encap < 0 || encap >= WTAP_NUM_ENCAP_TYPES)
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return NULL;
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else
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return encap_table[encap].short_name;
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}
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/* Translate a short name to a capture file type. */
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int wtap_short_string_to_encap(const char *short_name)
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{
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int encap;
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for (encap = 0; encap < WTAP_NUM_ENCAP_TYPES; encap++) {
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if (encap_table[encap].short_name != NULL &&
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strcmp(short_name, encap_table[encap].short_name) == 0)
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return encap;
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}
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return -1; /* no such encapsulation type */
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}
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static const char *wtap_errlist[] = {
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"The file isn't a plain file",
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"The file isn't a capture file in a known format",
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"File contains record data we don't support",
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NULL,
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"Files can't be saved in that format",
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"Files from that network type can't be saved in that format",
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"That format doesn't support per-packet encapsulations",
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NULL,
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NULL,
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"Less data was read than was expected",
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"File contains a record that's not valid",
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"Less data was written than was requested"
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};
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#define WTAP_ERRLIST_SIZE (sizeof wtap_errlist / sizeof wtap_errlist[0])
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const char *wtap_strerror(int err)
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{
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static char errbuf[6+11+1]; /* "Error %d" */
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int wtap_errlist_index;
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if (err < 0) {
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#ifdef HAVE_LIBZ
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if (err >= WTAP_ERR_ZLIB_MIN && err <= WTAP_ERR_ZLIB_MAX) {
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/* Assume it's a zlib error. */
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sprintf(errbuf, "Uncompression error: %s",
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zError(err - WTAP_ERR_ZLIB));
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return errbuf;
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}
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#endif
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wtap_errlist_index = -1 - err;
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if (wtap_errlist_index >= WTAP_ERRLIST_SIZE) {
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sprintf(errbuf, "Error %d", err);
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return errbuf;
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}
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if (wtap_errlist[wtap_errlist_index] == NULL)
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return "Unknown reason";
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return wtap_errlist[wtap_errlist_index];
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} else
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return strerror(err);
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}
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void wtap_close(wtap *wth)
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{
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if (wth->subtype_close != NULL)
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(*wth->subtype_close)(wth);
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file_close(wth->fh);
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if (wth->frame_buffer) {
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buffer_free(wth->frame_buffer);
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g_free(wth->frame_buffer);
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}
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g_free(wth);
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}
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int wtap_read(wtap *wth, int *err)
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{
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return wth -> subtype_read(wth, err);
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}
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int wtap_loop(wtap *wth, int count, wtap_handler callback, u_char* user,
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int *err)
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{
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int data_offset, loop = 0;
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/* Start be clearing error flag */
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*err = 0;
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while ((data_offset = wth->subtype_read(wth, err)) > 0) {
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callback(user, &wth->phdr, data_offset,
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buffer_start_ptr(wth->frame_buffer));
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if (count > 0 && ++loop >= count)
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break;
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}
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if (data_offset < 0)
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return FALSE; /* failure */
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else
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return TRUE; /* success */
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}
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int wtap_seek_read(int file_type, FILE *fh, int seek_off, guint8 *pd, int len)
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{
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switch (file_type) {
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case WTAP_FILE_ASCEND:
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return ascend_seek_read(fh, seek_off, pd, len);
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case WTAP_FILE_TOSHIBA:
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return toshiba_seek_read(fh, seek_off, pd, len);
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default:
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return wtap_def_seek_read(fh, seek_off, pd, len);
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}
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}
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