/* tap_export_pdu.c * Routines for exporting PDUs to file * * Wireshark - Network traffic analyzer * By Gerald Combs * 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 #include #include #include #include #include #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_optionblock_t shb_hdr; wtapng_iface_descriptions_t *idb_inf; wtap_optionblock_t int_data; wtapng_if_descr_mandatory_t *int_data_mand; GString *os_info_str; gsize opt_len; /* Create data for SHB */ os_info_str = g_string_new(""); get_os_version_info(os_info_str); shb_hdr = wtap_optionblock_create(WTAP_OPTION_BLOCK_NG_SECTION); /* options */ wtap_optionblock_set_option_string(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; wtap_optionblock_set_option_string(shb_hdr, OPT_SHB_OS, g_string_free(os_info_str, TRUE), opt_len); /* * UTF-8 string containing the name of the application used to create * this section. */ wtap_optionblock_set_option_string_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_optionblock_t)); /* create the fake interface data */ int_data = wtap_optionblock_create(WTAP_OPTION_BLOCK_IF_DESCR); int_data_mand = (wtapng_if_descr_mandatory_t*)wtap_optionblock_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_optionblock_set_option_string(int_data, OPT_IDB_NAME, "Fake IF, PDU->Export", strlen("Fake IF, PDU->Export")); wtap_optionblock_set_option_uint8(int_data, OPT_IDB_TSRESOL, 9); g_array_append_val(idb_inf->interface_data, int_data); /* 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_hdr, 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: */