/* packet-frame.c * * Top-most dissector. Decides dissector based on Wiretap Encapsulation Type. * * $Id: packet-frame.c,v 1.8 2001/06/18 02:17:46 guy Exp $ * * Ethereal - Network traffic analyzer * By Gerald Combs * Copyright 2000 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include "packet.h" #include "timestamp.h" #include "tvbuff.h" #include "packet-frame.h" static int proto_frame = -1; static int hf_frame_arrival_time = -1; static int hf_frame_time_delta = -1; static int hf_frame_time_relative = -1; static int hf_frame_number = -1; static int hf_frame_packet_len = -1; static int hf_frame_capture_len = -1; static int hf_frame_p2p_dir = -1; static int proto_short = -1; int proto_malformed = -1; static gint ett_frame = -1; static const value_string p2p_dirs[] = { { P2P_DIR_SENT, "Sent" }, { P2P_DIR_RECV, "Received" }, { 0, NULL } }; static dissector_table_t wtap_encap_dissector_table; void dissect_frame(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { proto_tree *fh_tree; proto_item *ti; struct timeval tv; int cap_len, pkt_len; pinfo->current_proto = "Frame"; if (pinfo->fd->lnk_t == WTAP_ENCAP_LAPD || pinfo->fd->lnk_t == WTAP_ENCAP_PPP_WITH_PHDR) { pinfo->p2p_dir = pinfo->pseudo_header->p2p.sent ? P2P_DIR_SENT : P2P_DIR_RECV; } /* Put in frame header information. */ if (tree) { cap_len = tvb_length(tvb); pkt_len = tvb_reported_length(tvb); ti = proto_tree_add_protocol_format(tree, proto_frame, tvb, 0, tvb_length(tvb), "Frame %u (%u on wire, %u captured)", pinfo->fd->num, pkt_len, cap_len); fh_tree = proto_item_add_subtree(ti, ett_frame); tv.tv_sec = pinfo->fd->abs_secs; tv.tv_usec = pinfo->fd->abs_usecs; proto_tree_add_time(fh_tree, hf_frame_arrival_time, tvb, 0, 0, &tv); tv.tv_sec = pinfo->fd->del_secs; tv.tv_usec = pinfo->fd->del_usecs; proto_tree_add_time(fh_tree, hf_frame_time_delta, tvb, 0, 0, &tv); tv.tv_sec = pinfo->fd->rel_secs; tv.tv_usec = pinfo->fd->rel_usecs; proto_tree_add_time(fh_tree, hf_frame_time_relative, tvb, 0, 0, &tv); proto_tree_add_uint(fh_tree, hf_frame_number, tvb, 0, 0, pinfo->fd->num); proto_tree_add_uint_format(fh_tree, hf_frame_packet_len, tvb, 0, 0, pkt_len, "Packet Length: %d byte%s", pkt_len, plurality(pkt_len, "", "s")); proto_tree_add_uint_format(fh_tree, hf_frame_capture_len, tvb, 0, 0, cap_len, "Capture Length: %d byte%s", cap_len, plurality(cap_len, "", "s")); /* Check for existences of P2P pseudo header */ if (pinfo->p2p_dir != P2P_DIR_UNKNOWN) { proto_tree_add_uint(fh_tree, hf_frame_p2p_dir, tvb, 0, 0, pinfo->p2p_dir); } } TRY { if (!dissector_try_port(wtap_encap_dissector_table, pinfo->fd->lnk_t, tvb, pinfo, tree)) { if (check_col(pinfo->fd, COL_PROTOCOL)) col_set_str(pinfo->fd, COL_PROTOCOL, "UNKNOWN"); if (check_col(pinfo->fd, COL_INFO)) col_add_fstr(pinfo->fd, COL_INFO, "WTAP_ENCAP = 0x%x", pinfo->fd->lnk_t); dissect_data(tvb, 0, pinfo, tree); } } CATCH(BoundsError) { if (check_col(pinfo->fd, COL_INFO)) col_append_str(pinfo->fd, COL_INFO, "[Short Frame]"); proto_tree_add_protocol_format(tree, proto_short, tvb, 0, 0, "[Short Frame: %s]", pinfo->current_proto ); } CATCH(ReportedBoundsError) { if (check_col(pinfo->fd, COL_INFO)) col_append_str(pinfo->fd, COL_INFO, "[Malformed Frame]"); proto_tree_add_protocol_format(tree, proto_malformed, tvb, 0, 0, "[Malformed Frame: %s]", pinfo->current_proto ); } ENDTRY; } void proto_register_frame(void) { static hf_register_info hf[] = { { &hf_frame_arrival_time, { "Arrival Time", "frame.time", FT_ABSOLUTE_TIME, BASE_NONE, NULL, 0x0, "", HFILL }}, { &hf_frame_time_delta, { "Time delta from previous packet", "frame.time_delta", FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0, "", HFILL }}, { &hf_frame_time_relative, { "Time relative to first packet", "frame.time_relative", FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0, "", HFILL }}, { &hf_frame_number, { "Frame Number", "frame.number", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }}, { &hf_frame_packet_len, { "Total Frame Length", "frame.pkt_len", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }}, { &hf_frame_capture_len, { "Capture Frame Length", "frame.cap_len", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }}, { &hf_frame_p2p_dir, { "Point-to-Point Direction", "frame.p2p_dir", FT_UINT8, BASE_DEC, VALS(p2p_dirs), 0x0, "", HFILL }}, }; static gint *ett[] = { &ett_frame, }; wtap_encap_dissector_table = register_dissector_table("wtap_encap"); proto_frame = proto_register_protocol("Frame", "Frame", "frame"); proto_register_field_array(proto_frame, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); register_dissector("frame",dissect_frame,proto_frame); /* You can't disable dissection of "Frame", as that would be tantamount to not doing any dissection whatsoever. */ proto_set_cant_disable(proto_frame); proto_short = proto_register_protocol("Short Frame", "Short frame", "short"); proto_malformed = proto_register_protocol("Malformed Frame", "Malformed frame", "malformed"); /* "Short Frame" and "Malformed Frame" aren't really protocols, they're error indications; disabling them makes no sense. */ proto_set_cant_disable(proto_short); proto_set_cant_disable(proto_malformed); }