/* packet-frame.c * * Top-most dissector. Decides dissector based on Wiretap Encapsulation Type. * * Wireshark - 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "config.h" #ifdef _MSC_VER #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "packet-frame.h" #include "packet-icmp.h" #include "log.h" #include #include void proto_register_frame(void); void proto_reg_handoff_frame(void); static int proto_frame = -1; static int proto_pkt_comment = -1; static int proto_syscall = -1; static int hf_frame_arrival_time = -1; static int hf_frame_shift_offset = -1; static int hf_frame_arrival_time_epoch = -1; static int hf_frame_time_delta = -1; static int hf_frame_time_delta_displayed = -1; static int hf_frame_time_relative = -1; static int hf_frame_time_reference = -1; static int hf_frame_number = -1; static int hf_frame_len = -1; static int hf_frame_capture_len = -1; static int hf_frame_p2p_dir = -1; static int hf_frame_file_off = -1; static int hf_frame_md5_hash = -1; static int hf_frame_marked = -1; static int hf_frame_ignored = -1; static int hf_link_number = -1; static int hf_frame_protocols = -1; static int hf_frame_color_filter_name = -1; static int hf_frame_color_filter_text = -1; static int hf_frame_interface_id = -1; static int hf_frame_interface_name = -1; static int hf_frame_interface_description = -1; static int hf_frame_pack_flags = -1; static int hf_frame_pack_direction = -1; static int hf_frame_pack_reception_type = -1; static int hf_frame_pack_fcs_length = -1; static int hf_frame_pack_reserved = -1; static int hf_frame_pack_crc_error = -1; static int hf_frame_pack_wrong_packet_too_long_error = -1; static int hf_frame_pack_wrong_packet_too_short_error = -1; static int hf_frame_pack_wrong_inter_frame_gap_error = -1; static int hf_frame_pack_unaligned_frame_error = -1; static int hf_frame_pack_start_frame_delimiter_error = -1; static int hf_frame_pack_preamble_error = -1; static int hf_frame_pack_symbol_error = -1; static int hf_frame_wtap_encap = -1; static int hf_comments_text = -1; static gint ett_frame = -1; static gint ett_ifname = -1; static gint ett_flags = -1; static gint ett_comments = -1; static expert_field ei_comments_text = EI_INIT; static expert_field ei_arrive_time_out_of_range = EI_INIT; static expert_field ei_incomplete = EI_INIT; static int frame_tap = -1; static dissector_handle_t docsis_handle; static dissector_handle_t sysdig_handle; /* Preferences */ static gboolean show_file_off = FALSE; static gboolean force_docsis_encap = FALSE; static gboolean generate_md5_hash = FALSE; static gboolean generate_epoch_time = TRUE; static gboolean generate_bits_field = TRUE; static gboolean disable_packet_size_limited_in_summary = FALSE; static const value_string p2p_dirs[] = { { P2P_DIR_UNKNOWN, "Unknown" }, { P2P_DIR_SENT, "Sent" }, { P2P_DIR_RECV, "Received" }, { 0, NULL } }; #define PACKET_WORD_DIRECTION_MASK 0x00000003 #define PACKET_WORD_RECEPTION_TYPE_MASK 0x0000001C #define PACKET_WORD_FCS_LENGTH_MASK 0x000001E0 #define PACKET_WORD_RESERVED_MASK 0x0000FE00 #define PACKET_WORD_CRC_ERR_MASK 0x01000000 #define PACKET_WORD_PACKET_TOO_LONG_ERR_MASK 0x02000000 #define PACKET_WORD_PACKET_TOO_SHORT_ERR_MASK 0x04000000 #define PACKET_WORD_WRONG_INTER_FRAME_GAP_ERR_MASK 0x08000000 #define PACKET_WORD_UNALIGNED_FRAME_ERR_MASK 0x10000000 #define PACKET_WORD_START_FRAME_DELIMITER_ERR_MASK 0x20000000 #define PACKET_WORD_PREAMBLE_ERR_MASK 0x40000000 #define PACKET_WORD_SYMBOL_ERR_MASK 0x80000000 static const value_string packet_word_directions[] = { { 0x00, "Not available" }, { 0x01, "Inbound" }, { 0x02, "Outbound" }, { 0x03, "Undefined" }, { 0, NULL } }; static const value_string packet_word_reception_types[] = { { 0x00, "Not specified" }, { 0x01, "Unicast" }, { 0x02, "Multicast" }, { 0x03, "Broadcast" }, { 0x04, "Promiscuous" }, { 0x05, "Undefined" }, { 0x06, "Undefined" }, { 0x07, "Undefined" }, { 0, NULL } }; static dissector_table_t wtap_encap_dissector_table; static dissector_table_t wtap_fts_rec_dissector_table; /****************************************************************************/ /* whenever a frame packet is seen by the tap listener */ /* Add a new frame into the graph */ static gboolean frame_seq_analysis_packet( void *ptr, packet_info *pinfo, epan_dissect_t *edt _U_, const void *dummy _U_) { seq_analysis_info_t *sainfo = (seq_analysis_info_t *) ptr; seq_analysis_item_t *sai = sequence_analysis_create_sai_with_addresses(pinfo, sainfo); if (!sai) return FALSE; sai->frame_number = pinfo->num; sequence_analysis_use_color_filter(pinfo, sai); sai->port_src=pinfo->srcport; sai->port_dst=pinfo->destport; sequence_analysis_use_col_info_as_label_comment(pinfo, sai); sai->line_style = 1; sai->conv_num = 0; sai->display = TRUE; g_queue_push_tail(sainfo->items, sai); return TRUE; } /* * Routine used to register frame end routine. The routine should only * be registered when the dissector is used in the frame, not in the * proto_register_XXX function. */ void register_frame_end_routine(packet_info *pinfo, void (*func)(void)) { pinfo->frame_end_routines = g_slist_append(pinfo->frame_end_routines, (gpointer)func); } typedef void (*void_func_t)(void); static void call_frame_end_routine(gpointer routine, gpointer dummy _U_) { void_func_t func = (void_func_t)routine; (*func)(); } static int dissect_frame(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void* data) { proto_item *volatile ti = NULL, *comment_item; guint cap_len = 0, frame_len = 0; proto_tree *volatile tree; proto_tree *comments_tree; proto_tree *volatile fh_tree = NULL; proto_item *item; const gchar *cap_plurality, *frame_plurality; frame_data_t *fr_data = (frame_data_t*)data; const color_filter_t *color_filter; tree=parent_tree; DISSECTOR_ASSERT(fr_data); switch (pinfo->phdr->rec_type) { case REC_TYPE_PACKET: pinfo->current_proto = "Frame"; if (pinfo->phdr->presence_flags & WTAP_HAS_PACK_FLAGS) { if (pinfo->phdr->pack_flags & 0x00000001) pinfo->p2p_dir = P2P_DIR_RECV; if (pinfo->phdr->pack_flags & 0x00000002) pinfo->p2p_dir = P2P_DIR_SENT; } /* * If the pseudo-header *and* the packet record both * have direction information, the pseudo-header * overrides the packet record. */ if (pinfo->pseudo_header != NULL) { switch (pinfo->pkt_encap) { case WTAP_ENCAP_WFLEET_HDLC: case WTAP_ENCAP_CHDLC_WITH_PHDR: case WTAP_ENCAP_PPP_WITH_PHDR: case WTAP_ENCAP_SDLC: case WTAP_ENCAP_BLUETOOTH_H4_WITH_PHDR: pinfo->p2p_dir = pinfo->pseudo_header->p2p.sent ? P2P_DIR_SENT : P2P_DIR_RECV; break; case WTAP_ENCAP_BLUETOOTH_HCI: pinfo->p2p_dir = pinfo->pseudo_header->bthci.sent; break; case WTAP_ENCAP_LAPB: case WTAP_ENCAP_FRELAY_WITH_PHDR: pinfo->p2p_dir = (pinfo->pseudo_header->x25.flags & FROM_DCE) ? P2P_DIR_RECV : P2P_DIR_SENT; break; case WTAP_ENCAP_ISDN: case WTAP_ENCAP_V5_EF: case WTAP_ENCAP_DPNSS: case WTAP_ENCAP_BACNET_MS_TP_WITH_PHDR: pinfo->p2p_dir = pinfo->pseudo_header->isdn.uton ? P2P_DIR_SENT : P2P_DIR_RECV; break; case WTAP_ENCAP_LINUX_LAPD: pinfo->p2p_dir = (pinfo->pseudo_header->lapd.pkttype == 3 || pinfo->pseudo_header->lapd.pkttype == 4) ? P2P_DIR_SENT : P2P_DIR_RECV; break; case WTAP_ENCAP_MTP2_WITH_PHDR: pinfo->p2p_dir = pinfo->pseudo_header->mtp2.sent ? P2P_DIR_SENT : P2P_DIR_RECV; pinfo->link_number = pinfo->pseudo_header->mtp2.link_number; break; case WTAP_ENCAP_GSM_UM: pinfo->p2p_dir = pinfo->pseudo_header->gsm_um.uplink ? P2P_DIR_SENT : P2P_DIR_RECV; break; } } break; case REC_TYPE_FT_SPECIFIC_EVENT: pinfo->current_proto = "Event"; break; case REC_TYPE_FT_SPECIFIC_REPORT: pinfo->current_proto = "Report"; break; case REC_TYPE_SYSCALL: pinfo->current_proto = "System Call"; break; default: g_assert_not_reached(); break; } if (fr_data->pkt_comment) { item = proto_tree_add_item(tree, proto_pkt_comment, tvb, 0, 0, ENC_NA); comments_tree = proto_item_add_subtree(item, ett_comments); comment_item = proto_tree_add_string_format(comments_tree, hf_comments_text, tvb, 0, 0, fr_data->pkt_comment, "%s", fr_data->pkt_comment); expert_add_info_format(pinfo, comment_item, &ei_comments_text, "%s", fr_data->pkt_comment); } /* if FRAME is not referenced from any filters we don't need to worry about generating any tree items. */ if (!proto_field_is_referenced(tree, proto_frame)) { tree=NULL; if (pinfo->presence_flags & PINFO_HAS_TS) { if (pinfo->abs_ts.nsecs < 0 || pinfo->abs_ts.nsecs >= 1000000000) expert_add_info(pinfo, NULL, &ei_arrive_time_out_of_range); } } else { /* Put in frame header information. */ cap_len = tvb_captured_length(tvb); frame_len = tvb_reported_length(tvb); cap_plurality = plurality(cap_len, "", "s"); frame_plurality = plurality(frame_len, "", "s"); switch (pinfo->phdr->rec_type) { case REC_TYPE_PACKET: case REC_TYPE_FT_SPECIFIC_EVENT: case REC_TYPE_FT_SPECIFIC_REPORT: ti = proto_tree_add_protocol_format(tree, proto_frame, tvb, 0, tvb_captured_length(tvb), "Frame %u: %u byte%s on wire", pinfo->num, frame_len, frame_plurality); if (generate_bits_field) proto_item_append_text(ti, " (%u bits)", frame_len * 8); proto_item_append_text(ti, ", %u byte%s captured", cap_len, cap_plurality); if (generate_bits_field) { proto_item_append_text(ti, " (%u bits)", cap_len * 8); } break; case REC_TYPE_SYSCALL: /* * This gives us a top-of-tree "syscall" protocol * with "frame" fields underneath. Should we create * corresponding syscall.time, .time_epoch, etc * fields and use them instead or would frame.* * be preferred? */ ti = proto_tree_add_protocol_format(tree, proto_syscall, tvb, 0, tvb_captured_length(tvb), "System Call %u: %u byte%s", pinfo->num, frame_len, frame_plurality); break; } if (pinfo->phdr->presence_flags & WTAP_HAS_INTERFACE_ID) { proto_item_append_text(ti, " on interface %u", pinfo->phdr->interface_id); } if (pinfo->phdr->presence_flags & WTAP_HAS_PACK_FLAGS) { if (pinfo->phdr->pack_flags & 0x00000001) proto_item_append_text(ti, " (inbound)"); if (pinfo->phdr->pack_flags & 0x00000002) proto_item_append_text(ti, " (outbound)"); } fh_tree = proto_item_add_subtree(ti, ett_frame); if (pinfo->phdr->presence_flags & WTAP_HAS_INTERFACE_ID && (proto_field_is_referenced(tree, hf_frame_interface_id) || proto_field_is_referenced(tree, hf_frame_interface_name) || proto_field_is_referenced(tree, hf_frame_interface_description))) { const char *interface_name = epan_get_interface_name(pinfo->epan, pinfo->phdr->interface_id); const char *interface_description = epan_get_interface_description(pinfo->epan, pinfo->phdr->interface_id); proto_tree *if_tree; proto_item *if_item; if (interface_name) { if_item = proto_tree_add_uint_format_value(fh_tree, hf_frame_interface_id, tvb, 0, 0, pinfo->phdr->interface_id, "%u (%s)", pinfo->phdr->interface_id, interface_name); if_tree = proto_item_add_subtree(if_item, ett_ifname); proto_tree_add_string(if_tree, hf_frame_interface_name, tvb, 0, 0, interface_name); } else { if_item = proto_tree_add_uint(fh_tree, hf_frame_interface_id, tvb, 0, 0, pinfo->phdr->interface_id); } if (interface_description) { if_tree = proto_item_add_subtree(if_item, ett_ifname); proto_tree_add_string(if_tree, hf_frame_interface_description, tvb, 0, 0, interface_description); } } if (pinfo->phdr->presence_flags & WTAP_HAS_PACK_FLAGS) { proto_tree *flags_tree; proto_item *flags_item; static const int * flags[] = { &hf_frame_pack_direction, &hf_frame_pack_reception_type, &hf_frame_pack_fcs_length, &hf_frame_pack_reserved, &hf_frame_pack_crc_error, &hf_frame_pack_wrong_packet_too_long_error, &hf_frame_pack_wrong_packet_too_short_error, &hf_frame_pack_wrong_inter_frame_gap_error, &hf_frame_pack_unaligned_frame_error, &hf_frame_pack_start_frame_delimiter_error, &hf_frame_pack_preamble_error, &hf_frame_pack_symbol_error, NULL }; flags_item = proto_tree_add_uint(fh_tree, hf_frame_pack_flags, tvb, 0, 0, pinfo->phdr->pack_flags); flags_tree = proto_item_add_subtree(flags_item, ett_flags); proto_tree_add_bitmask_list_value(flags_tree, tvb, 0, 0, flags, pinfo->phdr->pack_flags); } if (pinfo->phdr->rec_type == REC_TYPE_PACKET) proto_tree_add_int(fh_tree, hf_frame_wtap_encap, tvb, 0, 0, pinfo->pkt_encap); if (pinfo->presence_flags & PINFO_HAS_TS) { proto_tree_add_time(fh_tree, hf_frame_arrival_time, tvb, 0, 0, &(pinfo->abs_ts)); if (pinfo->abs_ts.nsecs < 0 || pinfo->abs_ts.nsecs >= 1000000000) { expert_add_info_format(pinfo, ti, &ei_arrive_time_out_of_range, "Arrival Time: Fractional second %09ld is invalid," " the valid range is 0-1000000000", (long) pinfo->abs_ts.nsecs); } item = proto_tree_add_time(fh_tree, hf_frame_shift_offset, tvb, 0, 0, &(pinfo->fd->shift_offset)); PROTO_ITEM_SET_GENERATED(item); if (generate_epoch_time) { proto_tree_add_time(fh_tree, hf_frame_arrival_time_epoch, tvb, 0, 0, &(pinfo->abs_ts)); } if (proto_field_is_referenced(tree, hf_frame_time_delta)) { nstime_t del_cap_ts; frame_delta_abs_time(pinfo->epan, pinfo->fd, pinfo->num - 1, &del_cap_ts); item = proto_tree_add_time(fh_tree, hf_frame_time_delta, tvb, 0, 0, &(del_cap_ts)); PROTO_ITEM_SET_GENERATED(item); } if (proto_field_is_referenced(tree, hf_frame_time_delta_displayed)) { nstime_t del_dis_ts; frame_delta_abs_time(pinfo->epan, pinfo->fd, pinfo->fd->prev_dis_num, &del_dis_ts); item = proto_tree_add_time(fh_tree, hf_frame_time_delta_displayed, tvb, 0, 0, &(del_dis_ts)); PROTO_ITEM_SET_GENERATED(item); } item = proto_tree_add_time(fh_tree, hf_frame_time_relative, tvb, 0, 0, &(pinfo->rel_ts)); PROTO_ITEM_SET_GENERATED(item); if (pinfo->fd->flags.ref_time) { ti = proto_tree_add_item(fh_tree, hf_frame_time_reference, tvb, 0, 0, ENC_NA); PROTO_ITEM_SET_GENERATED(ti); } } proto_tree_add_uint(fh_tree, hf_frame_number, tvb, 0, 0, pinfo->num); proto_tree_add_uint_format(fh_tree, hf_frame_len, tvb, 0, 0, frame_len, "Frame Length: %u byte%s (%u bits)", frame_len, frame_plurality, frame_len * 8); proto_tree_add_uint_format(fh_tree, hf_frame_capture_len, tvb, 0, 0, cap_len, "Capture Length: %u byte%s (%u bits)", cap_len, cap_plurality, cap_len * 8); if (generate_md5_hash) { const guint8 *cp; guint8 digest[HASH_MD5_LENGTH]; const gchar *digest_string; cp = tvb_get_ptr(tvb, 0, cap_len); gcry_md_hash_buffer(GCRY_MD_MD5, digest, cp, cap_len); digest_string = bytestring_to_str(wmem_packet_scope(), digest, HASH_MD5_LENGTH, '\0'); ti = proto_tree_add_string(fh_tree, hf_frame_md5_hash, tvb, 0, 0, digest_string); PROTO_ITEM_SET_GENERATED(ti); } ti = proto_tree_add_boolean(fh_tree, hf_frame_marked, tvb, 0, 0,pinfo->fd->flags.marked); PROTO_ITEM_SET_GENERATED(ti); ti = proto_tree_add_boolean(fh_tree, hf_frame_ignored, tvb, 0, 0,pinfo->fd->flags.ignored); PROTO_ITEM_SET_GENERATED(ti); /* Check for existences of P2P pseudo header */ if (pinfo->p2p_dir != P2P_DIR_UNKNOWN) { proto_tree_add_int(fh_tree, hf_frame_p2p_dir, tvb, 0, 0, pinfo->p2p_dir); } /* Check for existences of MTP2 link number */ if ((pinfo->pseudo_header != NULL ) && (pinfo->pkt_encap == WTAP_ENCAP_MTP2_WITH_PHDR)) { proto_tree_add_uint(fh_tree, hf_link_number, tvb, 0, 0, pinfo->link_number); } if (show_file_off) { proto_tree_add_int64_format_value(fh_tree, hf_frame_file_off, tvb, 0, 0, pinfo->fd->file_off, "%" G_GINT64_MODIFIER "d (0x%" G_GINT64_MODIFIER "x)", pinfo->fd->file_off, pinfo->fd->file_off); } } if (pinfo->fd->flags.ignored) { /* Ignored package, stop handling here */ col_set_str(pinfo->cinfo, COL_INFO, ""); proto_tree_add_boolean_format(tree, hf_frame_ignored, tvb, 0, 0, TRUE, "This frame is marked as ignored"); return tvb_captured_length(tvb); } /* Portable Exception Handling to trap Wireshark specific exceptions like BoundsError exceptions */ TRY { #ifdef _MSC_VER /* Win32: Visual-C Structured Exception Handling (SEH) to trap hardware exceptions like memory access violations. (a running debugger will be called before the except part below) */ /* Note: A Windows "exceptional exception" may leave the kazlib's (Portable Exception Handling) stack in an inconsistent state thus causing a crash at some point in the handling of the exception. See: https://www.wireshark.org/lists/wireshark-dev/200704/msg00243.html */ __try { #endif switch (pinfo->phdr->rec_type) { case REC_TYPE_PACKET: if ((force_docsis_encap) && (docsis_handle)) { call_dissector_with_data(docsis_handle, tvb, pinfo, parent_tree, (void *)pinfo->pseudo_header); } else { if (!dissector_try_uint_new(wtap_encap_dissector_table, pinfo->pkt_encap, tvb, pinfo, parent_tree, TRUE, (void *)pinfo->pseudo_header)) { col_set_str(pinfo->cinfo, COL_PROTOCOL, "UNKNOWN"); col_add_fstr(pinfo->cinfo, COL_INFO, "WTAP_ENCAP = %d", pinfo->pkt_encap); call_data_dissector(tvb, pinfo, parent_tree); } } break; case REC_TYPE_FT_SPECIFIC_EVENT: case REC_TYPE_FT_SPECIFIC_REPORT: { int file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_UNKNOWN; file_type_subtype = fr_data->file_type_subtype; if (!dissector_try_uint(wtap_fts_rec_dissector_table, file_type_subtype, tvb, pinfo, parent_tree)) { col_set_str(pinfo->cinfo, COL_PROTOCOL, "UNKNOWN"); col_add_fstr(pinfo->cinfo, COL_INFO, "WTAP_ENCAP = %d", file_type_subtype); call_data_dissector(tvb, pinfo, parent_tree); } } break; case REC_TYPE_SYSCALL: /* Sysdig is the only type we currently handle. */ if (sysdig_handle) { call_dissector_with_data(sysdig_handle, tvb, pinfo, parent_tree, (void *)pinfo->pseudo_header); } break; } #ifdef _MSC_VER } __except(EXCEPTION_EXECUTE_HANDLER /* handle all exceptions */) { switch (GetExceptionCode()) { case(STATUS_ACCESS_VIOLATION): show_exception(tvb, pinfo, parent_tree, DissectorError, "STATUS_ACCESS_VIOLATION: dissector accessed an invalid memory address"); break; case(STATUS_INTEGER_DIVIDE_BY_ZERO): show_exception(tvb, pinfo, parent_tree, DissectorError, "STATUS_INTEGER_DIVIDE_BY_ZERO: dissector tried an integer division by zero"); break; case(STATUS_STACK_OVERFLOW): show_exception(tvb, pinfo, parent_tree, DissectorError, "STATUS_STACK_OVERFLOW: dissector overflowed the stack (e.g. endless loop)"); /* XXX - this will have probably corrupted the stack, which makes problems later in the exception code */ break; /* XXX - add other hardware exception codes as required */ default: show_exception(tvb, pinfo, parent_tree, DissectorError, g_strdup_printf("dissector caused an unknown exception: 0x%x", GetExceptionCode())); } } #endif } CATCH_BOUNDS_AND_DISSECTOR_ERRORS { show_exception(tvb, pinfo, parent_tree, EXCEPT_CODE, GET_MESSAGE); } ENDTRY; if (proto_field_is_referenced(tree, hf_frame_protocols)) { wmem_strbuf_t *val = wmem_strbuf_sized_new(wmem_packet_scope(), 128, 0); wmem_list_frame_t *frame; /* skip the first entry, it's always the "frame" protocol */ frame = wmem_list_frame_next(wmem_list_head(pinfo->layers)); if (frame) { wmem_strbuf_append(val, proto_get_protocol_filter_name(GPOINTER_TO_UINT(wmem_list_frame_data(frame)))); frame = wmem_list_frame_next(frame); } while (frame) { wmem_strbuf_append_c(val, ':'); wmem_strbuf_append(val, proto_get_protocol_filter_name(GPOINTER_TO_UINT(wmem_list_frame_data(frame)))); frame = wmem_list_frame_next(frame); } ti = proto_tree_add_string(fh_tree, hf_frame_protocols, tvb, 0, 0, wmem_strbuf_get_str(val)); PROTO_ITEM_SET_GENERATED(ti); } /* Call postdissectors if we have any (while trying to avoid another * TRY/CATCH) */ if (have_postdissector()) { TRY { #ifdef _MSC_VER /* Win32: Visual-C Structured Exception Handling (SEH) to trap hardware exceptions like memory access violations */ /* (a running debugger will be called before the except part below) */ /* Note: A Windows "exceptional exception" may leave the kazlib's (Portable Exception Handling) stack in an inconsistent state thus causing a crash at some point in the handling of the exception. See: https://www.wireshark.org/lists/wireshark-dev/200704/msg00243.html */ __try { #endif call_all_postdissectors(tvb, pinfo, parent_tree); #ifdef _MSC_VER } __except(EXCEPTION_EXECUTE_HANDLER /* handle all exceptions */) { switch (GetExceptionCode()) { case(STATUS_ACCESS_VIOLATION): show_exception(tvb, pinfo, parent_tree, DissectorError, "STATUS_ACCESS_VIOLATION: dissector accessed an invalid memory address"); break; case(STATUS_INTEGER_DIVIDE_BY_ZERO): show_exception(tvb, pinfo, parent_tree, DissectorError, "STATUS_INTEGER_DIVIDE_BY_ZERO: dissector tried an integer division by zero"); break; case(STATUS_STACK_OVERFLOW): show_exception(tvb, pinfo, parent_tree, DissectorError, "STATUS_STACK_OVERFLOW: dissector overflowed the stack (e.g. endless loop)"); /* XXX - this will have probably corrupted the stack, which makes problems later in the exception code */ break; /* XXX - add other hardware exception codes as required */ default: show_exception(tvb, pinfo, parent_tree, DissectorError, g_strdup_printf("dissector caused an unknown exception: 0x%x", GetExceptionCode())); } } #endif } CATCH_BOUNDS_AND_DISSECTOR_ERRORS { show_exception(tvb, pinfo, parent_tree, EXCEPT_CODE, GET_MESSAGE); } ENDTRY; } /* Attempt to (re-)calculate color filters (if any). */ if (pinfo->fd->flags.need_colorize) { color_filter = color_filters_colorize_packet(fr_data->color_edt); pinfo->fd->color_filter = color_filter; pinfo->fd->flags.need_colorize = 0; } else { color_filter = pinfo->fd->color_filter; } if (color_filter) { item = proto_tree_add_string(fh_tree, hf_frame_color_filter_name, tvb, 0, 0, color_filter->filter_name); PROTO_ITEM_SET_GENERATED(item); item = proto_tree_add_string(fh_tree, hf_frame_color_filter_text, tvb, 0, 0, color_filter->filter_text); PROTO_ITEM_SET_GENERATED(item); } tap_queue_packet(frame_tap, pinfo, NULL); if (pinfo->frame_end_routines) { g_slist_foreach(pinfo->frame_end_routines, &call_frame_end_routine, NULL); g_slist_free(pinfo->frame_end_routines); pinfo->frame_end_routines = NULL; } if (prefs.enable_incomplete_dissectors_check && tree && tree->tree_data->visible) { gchar* decoded; guint length; guint i; guint byte; guint bit; length = tvb_captured_length(tvb); decoded = proto_find_undecoded_data(tree, length); for (i = 0; i < length; i++) { byte = i / 8; bit = i % 8; if (!(decoded[byte] & (1 << bit))) { field_info* fi = proto_find_field_from_offset(tree, i, tvb); if (fi && fi->hfinfo->id != proto_frame) { if (prefs.incomplete_dissectors_check_debug) g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_WARNING, "Dissector %s incomplete in frame %u: undecoded byte number %u " "(0x%.4X+%u)", (fi ? fi->hfinfo->abbrev : "[unknown]"), pinfo->num, i, i - i % 16, i % 16); proto_tree_add_expert_format(tree, pinfo, &ei_incomplete, tvb, i, 1, "Undecoded byte number: %u (0x%.4X+%u)", i, i - i % 16, i % 16); } } } } return tvb_captured_length(tvb); } void proto_register_frame(void) { static hf_register_info hf[] = { { &hf_frame_arrival_time, { "Arrival Time", "frame.time", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x0, "Absolute time when this frame was captured", HFILL }}, { &hf_frame_shift_offset, { "Time shift for this packet", "frame.offset_shift", FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0, "Time shift applied to this packet", HFILL }}, { &hf_frame_arrival_time_epoch, { "Epoch Time", "frame.time_epoch", FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0, "Epoch time when this frame was captured", HFILL }}, { &hf_frame_time_delta, { "Time delta from previous captured frame", "frame.time_delta", FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_frame_time_delta_displayed, { "Time delta from previous displayed frame", "frame.time_delta_displayed", FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_frame_time_relative, { "Time since reference or first frame", "frame.time_relative", FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0, "Time relative to time reference or first frame", HFILL }}, { &hf_frame_time_reference, { "This is a Time Reference frame", "frame.ref_time", FT_NONE, BASE_NONE, NULL, 0x0, "This frame is a Time Reference frame", HFILL }}, { &hf_frame_number, { "Frame Number", "frame.number", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }}, { &hf_frame_len, { "Frame length on the wire", "frame.len", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }}, { &hf_frame_capture_len, { "Frame length stored into the capture file", "frame.cap_len", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }}, { &hf_frame_md5_hash, { "Frame MD5 Hash", "frame.md5_hash", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_frame_p2p_dir, { "Point-to-Point Direction", "frame.p2p_dir", FT_INT8, BASE_DEC, VALS(p2p_dirs), 0x0, NULL, HFILL }}, { &hf_link_number, { "Link Number", "frame.link_nr", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }}, { &hf_frame_file_off, { "File Offset", "frame.file_off", FT_INT64, BASE_DEC, NULL, 0x0, NULL, HFILL }}, { &hf_frame_marked, { "Frame is marked", "frame.marked", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Frame is marked in the GUI", HFILL }}, { &hf_frame_ignored, { "Frame is ignored", "frame.ignored", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Frame is ignored by the dissectors", HFILL }}, { &hf_frame_protocols, { "Protocols in frame", "frame.protocols", FT_STRING, BASE_NONE, NULL, 0x0, "Protocols carried by this frame", HFILL }}, { &hf_frame_color_filter_name, { "Coloring Rule Name", "frame.coloring_rule.name", FT_STRING, BASE_NONE, NULL, 0x0, "The frame matched the coloring rule with this name", HFILL }}, { &hf_frame_color_filter_text, { "Coloring Rule String", "frame.coloring_rule.string", FT_STRING, BASE_NONE, NULL, 0x0, "The frame matched this coloring rule string", HFILL }}, { &hf_frame_interface_id, { "Interface id", "frame.interface_id", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }}, { &hf_frame_interface_name, { "Interface name", "frame.interface_name", FT_STRING, BASE_NONE, NULL, 0x0, "The friendly name for this interface", HFILL }}, { &hf_frame_interface_description, { "Interface description", "frame.interface_description", FT_STRING, BASE_NONE, NULL, 0x0, "The descriptionfor this interface", HFILL }}, { &hf_frame_pack_flags, { "Packet flags", "frame.packet_flags", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL }}, { &hf_frame_pack_direction, { "Direction", "frame.packet_flags_direction", FT_UINT32, BASE_HEX, VALS(packet_word_directions), PACKET_WORD_DIRECTION_MASK, NULL, HFILL }}, { &hf_frame_pack_reception_type, { "Reception type", "frame.packet_flags_reception_type", FT_UINT32, BASE_DEC, VALS(packet_word_reception_types), PACKET_WORD_RECEPTION_TYPE_MASK, NULL, HFILL }}, { &hf_frame_pack_fcs_length, { "FCS length", "frame.packet_flags_fcs_length", FT_UINT32, BASE_DEC, NULL, PACKET_WORD_FCS_LENGTH_MASK, NULL, HFILL }}, { &hf_frame_pack_reserved, { "Reserved", "frame.packet_flags_reserved", FT_UINT32, BASE_DEC, NULL, PACKET_WORD_RESERVED_MASK, NULL, HFILL }}, { &hf_frame_pack_crc_error, { "CRC error", "frame.packet_flags_crc_error", FT_BOOLEAN, 32, TFS(&tfs_set_notset), PACKET_WORD_CRC_ERR_MASK, NULL, HFILL }}, { &hf_frame_pack_wrong_packet_too_long_error, { "Packet too long error", "frame.packet_flags_packet_too_error", FT_BOOLEAN, 32, TFS(&tfs_set_notset), PACKET_WORD_PACKET_TOO_LONG_ERR_MASK, NULL, HFILL }}, { &hf_frame_pack_wrong_packet_too_short_error, { "Packet too short error", "frame.packet_flags_packet_too_short_error", FT_BOOLEAN, 32, TFS(&tfs_set_notset), PACKET_WORD_PACKET_TOO_SHORT_ERR_MASK, NULL, HFILL }}, { &hf_frame_pack_wrong_inter_frame_gap_error, { "Wrong interframe gap error", "frame.packet_flags_wrong_inter_frame_gap_error", FT_BOOLEAN, 32, TFS(&tfs_set_notset), PACKET_WORD_WRONG_INTER_FRAME_GAP_ERR_MASK, NULL, HFILL }}, { &hf_frame_pack_unaligned_frame_error, { "Unaligned frame error", "frame.packet_flags_unaligned_frame_error", FT_BOOLEAN, 32, TFS(&tfs_set_notset), PACKET_WORD_UNALIGNED_FRAME_ERR_MASK, NULL, HFILL }}, { &hf_frame_pack_start_frame_delimiter_error, { "Start frame delimiter error", "frame.packet_flags_start_frame_delimiter_error", FT_BOOLEAN, 32, TFS(&tfs_set_notset), PACKET_WORD_START_FRAME_DELIMITER_ERR_MASK, NULL, HFILL }}, { &hf_frame_pack_preamble_error, { "Preamble error", "frame.packet_flags_preamble_error", FT_BOOLEAN, 32, TFS(&tfs_set_notset), PACKET_WORD_PREAMBLE_ERR_MASK, NULL, HFILL }}, { &hf_frame_pack_symbol_error, { "Symbol error", "frame.packet_flags_symbol_error", FT_BOOLEAN, 32, TFS(&tfs_set_notset), PACKET_WORD_SYMBOL_ERR_MASK, NULL, HFILL }}, { &hf_comments_text, { "Comment", "frame.comment", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }}, }; static hf_register_info hf_encap = { &hf_frame_wtap_encap, { "Encapsulation type", "frame.encap_type", FT_INT16, BASE_DEC, NULL, 0x0, NULL, HFILL }}; static gint *ett[] = { &ett_frame, &ett_ifname, &ett_flags, &ett_comments }; static ei_register_info ei[] = { { &ei_comments_text, { "frame.comment.expert", PI_COMMENTS_GROUP, PI_COMMENT, "Formatted comment", EXPFILL }}, { &ei_arrive_time_out_of_range, { "frame.time_invalid", PI_SEQUENCE, PI_NOTE, "Arrival Time: Fractional second out of range (0-1000000000)", EXPFILL }}, { &ei_incomplete, { "frame.incomplete", PI_UNDECODED, PI_NOTE, "Incomplete dissector", EXPFILL }} }; module_t *frame_module; expert_module_t* expert_frame; if (hf_encap.hfinfo.strings == NULL) { int encap_count = wtap_get_num_encap_types(); value_string *arr; int i; hf_encap.hfinfo.strings = arr = wmem_alloc_array(wmem_epan_scope(), value_string, encap_count+1); for (i = 0; i < encap_count; i++) { arr[i].value = i; arr[i].strptr = wtap_encap_string(i); } arr[encap_count].value = 0; arr[encap_count].strptr = NULL; } proto_frame = proto_register_protocol("Frame", "Frame", "frame"); proto_pkt_comment = proto_register_protocol_in_name_only("Packet comments", "Pkt_Comment", "pkt_comment", proto_frame, FT_PROTOCOL); proto_syscall = proto_register_protocol("System Call", "Syscall", "syscall"); proto_register_field_array(proto_frame, hf, array_length(hf)); proto_register_field_array(proto_frame, &hf_encap, 1); proto_register_subtree_array(ett, array_length(ett)); expert_frame = expert_register_protocol(proto_frame); expert_register_field_array(expert_frame, ei, array_length(ei)); register_dissector("frame",dissect_frame,proto_frame); wtap_encap_dissector_table = register_dissector_table("wtap_encap", "Wiretap encapsulation type", proto_frame, FT_UINT32, BASE_DEC); wtap_fts_rec_dissector_table = register_dissector_table("wtap_fts_rec", "Wiretap file type for file-type-specific records", proto_frame, FT_UINT32, BASE_DEC); register_capture_dissector_table("wtap_encap", "Wiretap encapsulation type"); /* You can't disable dissection of "Frame", as that would be tantamount to not doing any dissection whatsoever. */ proto_set_cant_toggle(proto_frame); register_seq_analysis("any", "All Flows", proto_frame, NULL, TL_REQUIRES_COLUMNS, frame_seq_analysis_packet); /* Our preferences */ frame_module = prefs_register_protocol(proto_frame, NULL); prefs_register_bool_preference(frame_module, "show_file_off", "Show File Offset", "Show offset of frame in capture file", &show_file_off); prefs_register_bool_preference(frame_module, "force_docsis_encap", "Treat all frames as DOCSIS frames", "Treat all frames as DOCSIS Frames", &force_docsis_encap); prefs_register_bool_preference(frame_module, "generate_md5_hash", "Generate an MD5 hash of each frame", "Whether or not MD5 hashes should be generated for each frame, useful for finding duplicate frames.", &generate_md5_hash); prefs_register_bool_preference(frame_module, "generate_epoch_time", "Generate an epoch time entry for each frame", "Whether or not an Epoch time entry should be generated for each frame.", &generate_epoch_time); prefs_register_bool_preference(frame_module, "generate_bits_field", "Show the number of bits in the frame", "Whether or not the number of bits in the frame should be shown.", &generate_bits_field); prefs_register_bool_preference(frame_module, "disable_packet_size_limited_in_summary", "Disable 'packet size limited during capture' message in summary", "Whether or not 'packet size limited during capture' message in shown in Info column.", &disable_packet_size_limited_in_summary); frame_tap=register_tap("frame"); } void proto_reg_handoff_frame(void) { docsis_handle = find_dissector_add_dependency("docsis", proto_frame); sysdig_handle = find_dissector_add_dependency("sysdig", proto_frame); } /* * Editor modelines - http://www.wireshark.org/tools/modelines.html * * Local variables: * c-basic-offset: 8 * tab-width: 8 * indent-tabs-mode: t * End: * * vi: set shiftwidth=8 tabstop=8 noexpandtab: * :indentSize=8:tabSize=8:noTabs=false: */