forked from osmocom/wireshark
539 lines
12 KiB
C
539 lines
12 KiB
C
/* wtap.c
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*
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* $Id$
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*
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* Wiretap Library
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* Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
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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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include <errno.h>
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_IO_H
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#include <io.h>
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#endif
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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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/*
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* Return the size of the file, as reported by the OS.
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* (gint64, in case that's 64 bits.)
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*/
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gint64
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wtap_file_size(wtap *wth, int *err)
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{
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struct stat statb;
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if (fstat(wth->fd, &statb) == -1) {
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if (err != NULL)
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*err = errno;
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return -1;
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}
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return statb.st_size;
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}
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int
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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
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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
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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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static const 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_TOKEN_RING */
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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_ARCNET_LINUX */
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{ "Linux ARCNET", "arcnet_linux" },
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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_PDUS */
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{ "ATM PDUs", "atm-pdus" },
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/* WTAP_ENCAP_ATM_PDUS_UNTRUNCATED */
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{ "ATM PDUs - untruncated", "atm-pdus-untruncated" },
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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_ISDN */
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{ "ISDN", "isdn" },
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/* WTAP_ENCAP_IP_OVER_FC */
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{ "RFC 2625 IP-over-Fibre Channel", "ip-over-fc" },
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/* WTAP_ENCAP_PPP_WITH_PHDR */
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{ "PPP with Directional Info", "ppp-with-direction" },
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/* WTAP_ENCAP_IEEE_802_11 */
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{ "IEEE 802.11 Wireless LAN", "ieee-802-11" },
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/* WTAP_ENCAP_PRISM_HEADER */
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{ "IEEE 802.11 plus Prism II monitor mode header", "prism" },
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/* WTAP_ENCAP_IEEE_802_11_WITH_RADIO */
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{ "IEEE 802.11 Wireless LAN with radio information", "ieee-802-11-radio" },
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/* WTAP_ENCAP_IEEE_802_11_WLAN_RADIOTAP */
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{ "IEEE 802.11 plus radiotap WLAN header", "ieee-802-11-radiotap" },
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/* WTAP_ENCAP_IEEE_802_11_WLAN_AVS */
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{ "IEEE 802.11 plus AVS WLAN header", "ieee-802-11-avs" },
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/* WTAP_ENCAP_SLL */
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{ "Linux cooked-mode capture", "linux-sll" },
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/* WTAP_ENCAP_FRELAY */
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{ "Frame Relay", "frelay" },
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/* WTAP_ENCAP_FRELAY_WITH_PHDR */
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{ "Frame Relay with Directional Info", "frelay-with-direction" },
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/* WTAP_ENCAP_CHDLC */
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{ "Cisco HDLC", "chdlc" },
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/* WTAP_ENCAP_CISCO_IOS */
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{ "Cisco IOS internal", "ios" },
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/* WTAP_ENCAP_LOCALTALK */
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{ "Localtalk", "ltalk" },
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/* WTAP_ENCAP_OLD_PFLOG */
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{ "OpenBSD PF Firewall logs, pre-3.4", "pflog-old" },
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/* WTAP_ENCAP_HHDLC */
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{ "HiPath HDLC", "hhdlc" },
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/* WTAP_ENCAP_DOCSIS */
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{ "Data Over Cable Service Interface Specification", "docsis" },
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/* WTAP_ENCAP_COSINE */
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{ "CoSine L2 debug log", "cosine" },
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/* WTAP_ENCAP_WFLEET_HDLC */
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{ "Wellfleet HDLC", "whdlc" },
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/* WTAP_ENCAP_SDLC */
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{ "SDLC", "sdlc" },
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/* WTAP_ENCAP_TZSP */
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{ "Tazmen sniffer protocol", "tzsp" },
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/* WTAP_ENCAP_ENC */
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{ "OpenBSD enc(4) encapsulating interface", "enc" },
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/* WTAP_ENCAP_PFLOG */
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{ "OpenBSD PF Firewall logs", "pflog" },
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/* WTAP_ENCAP_CHDLC_WITH_PHDR */
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{ "Cisco HDLC with Directional Info", "chdlc-with-direction" },
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/* WTAP_ENCAP_BLUETOOTH_H4 */
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{ "Bluetooth H4", "bluetooth-h4" },
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/* WTAP_ENCAP_MTP2 */
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{ "SS7 MTP2", "mtp2" },
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/* WTAP_ENCAP_MTP3 */
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{ "SS7 MTP3", "mtp3" },
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/* WTAP_ENCAP_IRDA */
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{ "IrDA", "irda" },
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/* WTAP_ENCAP_USER0 */
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{ "USER 0", "user0" },
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/* WTAP_ENCAP_USER1 */
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{ "USER 1", "user1" },
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/* WTAP_ENCAP_USER2 */
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{ "USER 2", "user2" },
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/* WTAP_ENCAP_USER3 */
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{ "USER 3", "user3" },
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/* WTAP_ENCAP_USER4 */
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{ "USER 4", "user4" },
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/* WTAP_ENCAP_USER5 */
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{ "USER 5", "user5" },
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/* WTAP_ENCAP_USER6 */
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{ "USER 6", "user6" },
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/* WTAP_ENCAP_USER7 */
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{ "USER 7", "user7" },
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/* WTAP_ENCAP_USER8 */
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{ "USER 8", "user8" },
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/* WTAP_ENCAP_USER9 */
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{ "USER 9", "user9" },
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/* WTAP_ENCAP_USER10 */
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{ "USER 10", "user10" },
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/* WTAP_ENCAP_USER11 */
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{ "USER 11", "user11" },
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/* WTAP_ENCAP_USER12 */
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{ "USER 12", "user12" },
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/* WTAP_ENCAP_USER13 */
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{ "USER 13", "user13" },
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/* WTAP_ENCAP_USER14 */
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{ "USER 14", "user14" },
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/* WTAP_ENCAP_USER15 */
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{ "USER 15", "user15" },
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/* WTAP_ENCAP_SYMANTEC */
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{ "Symantec Enterprise Firewall", "symantec" },
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/* WTAP_ENCAP_APPLE_IP_OVER_IEEE1394 */
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{ "Apple IP-over-IEEE 1394", "ap1394" },
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/* WTAP_ENCAP_BACNET_MS_TP */
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{ "BACnet MS/TP", "bacnet-ms-tp" },
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/* WTAP_ENCAP_NETTL_RAW_ICMP */
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{ "Raw ICMP with nettl headers", "raw-icmp-nettl" },
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/* WTAP_ENCAP_NETTL_RAW_ICMPV6 */
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{ "Raw ICMPv6 with nettl headers", "raw-icmpv6-nettl" },
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/* WTAP_ENCAP_GPRS_LLC */
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{ "GPRS LLC", "gprs-llc" },
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/* WTAP_ENCAP_JUNIPER_ATM1 */
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{ "Juniper ATM1", "juniper-atm1" },
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/* WTAP_ENCAP_JUNIPER_ATM2 */
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{ "Juniper ATM2", "juniper-atm2" },
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/* WTAP_ENCAP_REDBACK */
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{ "Redback SmartEdge", "redback" },
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/* WTAP_ENCAP_NETTL_RAW_IP */
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{ "Raw IP with nettl headers", "rawip-nettl" },
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/* WTAP_ENCAP_NETTL_ETHERNET */
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{ "Ethernet with nettl headers", "ether-nettl" },
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/* WTAP_ENCAP_NETTL_TOKEN_RING */
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{ "Token Ring with nettl headers", "tr-nettl" },
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/* WTAP_ENCAP_NETTL_FDDI */
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{ "FDDI with nettl headers", "fddi-nettl" },
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/* WTAP_ENCAP_NETTL_UNKNOWN */
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{ "Unknown link-layer type with nettl headers", "unknown-nettl" },
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/* WTAP_ENCAP_MTP2_WITH_PHDR */
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{ "MTP2 with pseudoheader", "mtp2-with-phdr" },
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/* WTAP_ENCAP_JUNIPER_PPPOE */
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{ "Juniper PPPoE", "juniper-pppoe" },
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/* WTAP_ENCAP_GCOM_TIE1 */
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{ "GCOM TIE1", "gcom-tie1" },
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/* WTAP_ENCAP_GCOM_SERIAL */
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{ "GCOM Serial", "gcom-serial" },
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/* WTAP_ENCAP_NETTL_X25 */
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{ "X25 with nettl headers", "x25-nettl" },
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/* WTAP_ENCAP_JUNIPER_MLPPP */
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{ "Juniper MLPPP", "juniper-mlppp" },
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/* WTAP_ENCAP_JUNIPER_MLFR */
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{ "Juniper MLFR", "juniper-mlfr" },
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};
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/* Name that should be somewhat descriptive. */
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const char
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*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
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*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
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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 or pipe",
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"The file is being opened for random access but is a pipe",
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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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"That file format cannot be written to a pipe",
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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 file 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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"Uncompression error: data oddly truncated",
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"Uncompression error: data would overflow buffer",
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"Uncompression error: bad LZ77 offset",
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"The standard input cannot be opened for random access",
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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
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*wtap_strerror(int err)
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{
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static char errbuf[128];
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unsigned 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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/* Close only the sequential side, freeing up memory it uses.
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Note that we do *not* want to call the subtype's close function,
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as it would free any per-subtype data, and that data may be
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needed by the random-access side.
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Instead, if the subtype has a "sequential close" function, we call it,
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to free up stuff used only by the sequential side. */
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void
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wtap_sequential_close(wtap *wth)
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{
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if (wth->subtype_sequential_close != NULL)
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(*wth->subtype_sequential_close)(wth);
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if (wth->fh != NULL) {
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file_close(wth->fh);
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wth->fh = NULL;
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}
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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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wth->frame_buffer = NULL;
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}
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}
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void
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wtap_close(wtap *wth)
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{
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wtap_sequential_close(wth);
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if (wth->subtype_close != NULL)
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(*wth->subtype_close)(wth);
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if (wth->random_fh != NULL)
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file_close(wth->random_fh);
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g_free(wth);
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}
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gboolean
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wtap_read(wtap *wth, int *err, gchar **err_info, long *data_offset)
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{
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/*
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* Set the packet encapsulation to the file's encapsulation
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* value; if that's not WTAP_ENCAP_PER_PACKET, it's the
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* right answer (and means that the read routine for this
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* capture file type doesn't have to set it), and if it
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* *is* WTAP_ENCAP_PER_PACKET, the caller needs to set it
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* anyway.
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*/
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wth->phdr.pkt_encap = wth->file_encap;
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if (!wth->subtype_read(wth, err, err_info, data_offset))
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return FALSE; /* failure */
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/*
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* It makes no sense for the captured data length to be bigger
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* than the actual data length.
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*/
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if (wth->phdr.caplen > wth->phdr.len)
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wth->phdr.caplen = wth->phdr.len;
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/*
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* Make sure that it's not WTAP_ENCAP_PER_PACKET, as that
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* probably means the file has that encapsulation type
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* but the read routine didn't set this packet's
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* encapsulation type.
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*/
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g_assert(wth->phdr.pkt_encap != WTAP_ENCAP_PER_PACKET);
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return TRUE; /* success */
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}
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/*
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* Return an approximation of the amount of data we've read sequentially
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* from the file so far. (gint64, in case that's 64 bits.)
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*/
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gint64
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wtap_read_so_far(wtap *wth, int *err)
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{
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off_t file_pos;
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file_pos = lseek(wth->fd, 0, SEEK_CUR);
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if (file_pos == -1) {
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if (err != NULL)
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*err = errno;
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return -1;
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}
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return file_pos;
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}
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struct wtap_pkthdr*
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wtap_phdr(wtap *wth)
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{
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return &wth->phdr;
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}
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union wtap_pseudo_header*
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wtap_pseudoheader(wtap *wth)
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{
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return &wth->pseudo_header;
|
|
}
|
|
|
|
guint8*
|
|
wtap_buf_ptr(wtap *wth)
|
|
{
|
|
return buffer_start_ptr(wth->frame_buffer);
|
|
}
|
|
|
|
gboolean
|
|
wtap_seek_read(wtap *wth, long seek_off,
|
|
union wtap_pseudo_header *pseudo_header, guint8 *pd, int len,
|
|
int *err, gchar **err_info)
|
|
{
|
|
return wth->subtype_seek_read(wth, seek_off, pseudo_header, pd, len,
|
|
err, err_info);
|
|
}
|