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/* tap_export_pdu.c
* Routines for exporting PDUs to file
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "globals.h"
#include "wiretap/pcap-encap.h"
#include "wsutil/os_version_info.h"
#include "ws_version_info.h"
#include <epan/tap.h>
#include <epan/exported_pdu.h>
#include <epan/epan_dissect.h>
#include <wiretap/wtap.h>
#include <wiretap/wtap_opttypes.h>
#include <wiretap/pcapng.h>
#include "tap_export_pdu.h"
/* Main entry point to the tap */
static gboolean
export_pdu_packet(void *tapdata, packet_info *pinfo, epan_dissect_t *edt, const void *data)
{
const exp_pdu_data_t *exp_pdu_data = (const exp_pdu_data_t *)data;
exp_pdu_t *exp_pdu_tap_data = (exp_pdu_t *)tapdata;
struct wtap_pkthdr pkthdr;
int err;
gchar *err_info;
int buffer_len;
guint8 *packet_buf;
memset(&pkthdr, 0, sizeof(struct wtap_pkthdr));
buffer_len = exp_pdu_data->tvb_captured_length + exp_pdu_data->tlv_buffer_len;
packet_buf = (guint8 *)g_malloc(buffer_len);
if(exp_pdu_data->tlv_buffer_len > 0){
memcpy(packet_buf, exp_pdu_data->tlv_buffer, exp_pdu_data->tlv_buffer_len);
g_free(exp_pdu_data->tlv_buffer);
}
if(exp_pdu_data->tvb_captured_length > 0){
tvb_memcpy(exp_pdu_data->pdu_tvb, packet_buf+exp_pdu_data->tlv_buffer_len, 0, exp_pdu_data->tvb_captured_length);
}
pkthdr.rec_type = REC_TYPE_PACKET;
pkthdr.ts.secs = pinfo->abs_ts.secs;
pkthdr.ts.nsecs = pinfo->abs_ts.nsecs;
pkthdr.caplen = buffer_len;
pkthdr.len = exp_pdu_data->tvb_reported_length + exp_pdu_data->tlv_buffer_len;
pkthdr.pkt_encap = exp_pdu_tap_data->pkt_encap;
if (pinfo->fd->flags.has_user_comment)
pkthdr.opt_comment = g_strdup(epan_get_user_comment(edt->session, pinfo->fd));
else if (pinfo->fd->flags.has_phdr_comment)
pkthdr.opt_comment = g_strdup(pinfo->phdr->opt_comment);
pkthdr.presence_flags = WTAP_HAS_CAP_LEN|WTAP_HAS_INTERFACE_ID|WTAP_HAS_TS|WTAP_HAS_PACK_FLAGS;
/* XXX: should the pkthdr.pseudo_header be set to the pinfo's pseudo-header? */
/* XXX: report errors! */
if (!wtap_dump(exp_pdu_tap_data->wdh, &pkthdr, packet_buf, &err, &err_info)) {
switch (err) {
case WTAP_ERR_UNWRITABLE_REC_DATA:
g_free(err_info);
break;
default:
break;
}
}
g_free(packet_buf);
g_free(pkthdr.opt_comment);
return FALSE; /* Do not redraw */
}
int
exp_pdu_open(exp_pdu_t *exp_pdu_tap_data, int fd, char *comment)
{
int err;
/* pcapng defs */
wtap_block_t shb_hdr;
GArray *shb_hdrs = g_array_new(FALSE, FALSE, sizeof(wtap_block_t));
wtapng_iface_descriptions_t *idb_inf;
wtap_block_t int_data;
wtapng_if_descr_mandatory_t *int_data_mand;
GString *os_info_str;
gsize opt_len;
gchar *opt_str;
/* Create data for SHB */
os_info_str = g_string_new("");
get_os_version_info(os_info_str);
shb_hdr = wtap_block_create(WTAP_BLOCK_NG_SECTION);
/* options */
wtap_block_add_string_option(shb_hdr, OPT_COMMENT, comment, strlen(comment));
g_free(comment);
/*
* UTF-8 string containing the name of the operating system used to create
* this section.
*/
opt_len = os_info_str->len;
opt_str = g_string_free(os_info_str, FALSE);
if (opt_str) {
wtap_block_add_string_option(shb_hdr, OPT_SHB_OS, opt_str, opt_len);
g_free(opt_str);
}
/*
* UTF-8 string containing the name of the application used to create
* this section.
*/
wtap_block_add_string_option_format(shb_hdr, OPT_SHB_USERAPPL, "Wireshark %s", get_ws_vcs_version_info());
/* Create fake IDB info */
idb_inf = g_new(wtapng_iface_descriptions_t,1);
idb_inf->interface_data = g_array_new(FALSE, FALSE, sizeof(wtap_block_t));
/* create the fake interface data */
int_data = wtap_block_create(WTAP_BLOCK_IF_DESCR);
int_data_mand = (wtapng_if_descr_mandatory_t*)wtap_block_get_mandatory_data(int_data);
int_data_mand->wtap_encap = WTAP_ENCAP_WIRESHARK_UPPER_PDU;
int_data_mand->time_units_per_second = 1000000000; /* default nanosecond resolution */
int_data_mand->link_type = wtap_wtap_encap_to_pcap_encap(WTAP_ENCAP_WIRESHARK_UPPER_PDU);
int_data_mand->snap_len = WTAP_MAX_PACKET_SIZE;
wtap_block_add_string_option(int_data, OPT_IDB_NAME, "Fake IF, PDU->Export", strlen("Fake IF, PDU->Export"));
wtap_block_add_uint8_option(int_data, OPT_IDB_TSRESOL, 9);
g_array_append_val(idb_inf->interface_data, int_data);
g_array_append_val(shb_hdrs, shb_hdr);
/* Use a random name for the temporary import buffer */
exp_pdu_tap_data->wdh = wtap_dump_fdopen_ng(fd, WTAP_FILE_TYPE_SUBTYPE_PCAPNG, WTAP_ENCAP_WIRESHARK_UPPER_PDU, WTAP_MAX_PACKET_SIZE, FALSE,
shb_hdrs, idb_inf, NULL, &err);
if (exp_pdu_tap_data->wdh == NULL) {
g_assert(err != 0);
return err;
}
return 0;
}
int
exp_pdu_close(exp_pdu_t *exp_pdu_tap_data)
{
int err = 0;
if (!wtap_dump_close(exp_pdu_tap_data->wdh, &err))
g_assert(err != 0);
remove_tap_listener(exp_pdu_tap_data);
return err;
}
char *
exp_pdu_pre_open(const char *tap_name, const char *filter, exp_pdu_t *exp_pdu_tap_data)
{
GString *error_string;
/* XXX: can we always assume WTAP_ENCAP_WIRESHARK_UPPER_PDU? */
exp_pdu_tap_data->pkt_encap = wtap_wtap_encap_to_pcap_encap(WTAP_ENCAP_WIRESHARK_UPPER_PDU);
/* Register this tap listener now */
error_string = register_tap_listener(tap_name, /* The name of the tap we want to listen to */
exp_pdu_tap_data, /* instance identifier/pointer to a struct holding
* all state variables */
filter, /* pointer to a filter string */
TL_REQUIRES_PROTO_TREE, /* flags for the tap listener */
NULL,
export_pdu_packet,
NULL);
if (error_string != NULL)
return g_string_free(error_string, FALSE);
return NULL;
}
/*
* Editor modelines
*
* Local Variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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