2 * Routines for BEEP packet disassembly
4 * $Id: packet-beep.c,v 1.13 2003/07/25 04:17:36 gram Exp $
6 * Copyright (c) 2000 by Richard Sharpe <rsharpe@ns.aus.com>
7 * Modified 2001 Darren New <dnew@invisible.net> for BEEP.
9 * Original BXXP dissector developed with funding from InvisibleWorlds
10 * (www.invisibleworlds.com) via Collab.Net.
12 * Ethereal - Network traffic analyzer
14 * Copyright 1999 Gerald Combs
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License
18 * as published by the Free Software Foundation; either version 2
19 * of the License, or (at your option) any later version.
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
41 #include <epan/packet.h>
42 #include <epan/resolv.h>
44 #include <epan/conversation.h>
46 #define TCP_PORT_BEEP 10288
47 void proto_reg_handoff_beep(void);
50 static int global_beep_tcp_port = TCP_PORT_BEEP;
51 static int global_beep_strict_term = TRUE;
53 static int proto_beep = -1;
55 static int hf_beep_req = -1;
56 static int hf_beep_req_chan = -1;
57 static int hf_beep_rsp_chan = -1;
58 static int hf_beep_seq_chan = -1;
59 static int hf_beep_rsp = -1;
60 static int hf_beep_seq = -1;
61 static int hf_beep_end = -1;
62 static int hf_beep_proto_viol = -1;
63 static int hf_beep_complete = -1; /* No More data follows */
64 static int hf_beep_intermediate = -1; /* More data follows */
65 static int hf_beep_msgno = -1;
66 static int hf_beep_ansno = -1;
67 static int hf_beep_seqno = -1;
68 static int hf_beep_size = -1;
69 static int hf_beep_channel = -1;
70 static int hf_beep_positive = -1;
71 static int hf_beep_negative = -1;
72 static int hf_beep_ackno = -1;
73 static int hf_beep_window = -1;
75 /* Arrays of hf entry pointers for some routines to use. If you want more
76 * hidden items added for a field, add them to the list before the NULL,
77 * and the various routines that these are passed to will add them.
80 static int *req_msgno_hfa[] = { &hf_beep_msgno, NULL };
81 static int *req_ansno_hfa[] = { &hf_beep_ansno, NULL };
82 static int *req_seqno_hfa[] = { &hf_beep_seqno, NULL };
83 static int *req_size_hfa[] = { &hf_beep_size, NULL };
84 static int *req_chan_hfa[] = { &hf_beep_channel, &hf_beep_req_chan, NULL };
86 static int *rsp_msgno_hfa[] = { &hf_beep_msgno, NULL };
87 static int *rsp_seqno_hfa[] = { &hf_beep_seqno, NULL };
88 static int *rsp_size_hfa[] = { &hf_beep_size, NULL };
90 static int *seq_chan_hfa[] = { &hf_beep_channel, &hf_beep_seq_chan, NULL };
91 static int *seq_ackno_hfa[] = { &hf_beep_ackno, NULL };
92 static int *seq_window_hfa[] = { &hf_beep_window, NULL };
94 static int ett_beep = -1;
95 static int ett_mime_header = -1;
96 static int ett_header = -1;
97 static int ett_trailer = -1;
99 static unsigned int tcp_port = 0;
101 /* Get the state of the more flag ... */
104 #define BEEP_INTERMEDIATE 1
105 #define BEEP_COMPLETE 2
110 * pl_left is the amount of data in this packet that belongs to another
113 * It relies on TCP segments not being re-ordered too much ...
115 struct beep_proto_data {
116 int pl_left; /* Payload at beginning of frame */
117 int pl_size; /* Payload in current message ...*/
118 int mime_hdr; /* Whether we expect a mime header. 1 on first, 0 on rest
126 static int beep_packet_init_count = 100;
128 struct beep_request_key {
129 guint32 conversation;
132 struct beep_request_val {
133 guint16 processed; /* Have we processed this conversation? */
134 int size; /* Size of the message */
135 /* We need an indication in each dirn of
136 * whether on not a mime header is expected
138 int c_mime_hdr, s_mime_hdr;
141 static GHashTable *beep_request_hash = NULL;
142 static GMemChunk *beep_request_keys = NULL;
143 static GMemChunk *beep_request_vals = NULL;
144 static GMemChunk *beep_packet_infos = NULL;
148 beep_equal(gconstpointer v, gconstpointer w)
150 const struct beep_request_key *v1 = (const struct beep_request_key *)v;
151 const struct beep_request_key *v2 = (const struct beep_request_key *)w;
153 #if defined(DEBUG_BEEP_HASH)
154 printf("Comparing %08X\n and %08X\n",
155 v1->conversation, v2->conversation);
158 if (v1->conversation == v2->conversation)
166 beep_hash(gconstpointer v)
168 const struct beep_request_key *key = (const struct beep_request_key *)v;
171 val = key->conversation;
173 #if defined(DEBUG_BEEP_HASH)
174 printf("BEEP Hash calculated as %u\n", val);
182 beep_init_protocol(void)
184 #if defined(DEBUG_BEEP_HASH)
185 fprintf(stderr, "Initializing BEEP hashtable area\n");
188 if (beep_request_hash)
189 g_hash_table_destroy(beep_request_hash);
190 if (beep_request_keys)
191 g_mem_chunk_destroy(beep_request_keys);
192 if (beep_request_vals)
193 g_mem_chunk_destroy(beep_request_vals);
194 if (beep_packet_infos)
195 g_mem_chunk_destroy(beep_packet_infos);
197 beep_request_hash = g_hash_table_new(beep_hash, beep_equal);
198 beep_request_keys = g_mem_chunk_new("beep_request_keys",
199 sizeof(struct beep_request_key),
200 beep_packet_init_count * sizeof(struct beep_request_key), G_ALLOC_AND_FREE);
201 beep_request_vals = g_mem_chunk_new("beep_request_vals",
202 sizeof(struct beep_request_val),
203 beep_packet_init_count * sizeof(struct beep_request_val), G_ALLOC_AND_FREE);
204 beep_packet_infos = g_mem_chunk_new("beep_packet_infos",
205 sizeof(struct beep_proto_data),
206 beep_packet_init_count * sizeof(struct beep_proto_data), G_ALLOC_AND_FREE);
213 static int beep_get_more(char more)
217 return BEEP_COMPLETE;
218 else if (more == '*')
219 return BEEP_INTERMEDIATE;
224 /* dissect the more flag, and return a value of:
227 * -1 -> Proto violation
231 dissect_beep_more(tvbuff_t *tvb, int offset,
236 switch (beep_get_more(tvb_get_guint8(tvb, offset))) {
241 proto_tree_add_boolean_hidden(tree, hf_beep_complete, tvb, offset, 1, TRUE);
242 proto_tree_add_text(tree, tvb, offset, 1, "More: Complete");
249 case BEEP_INTERMEDIATE:
252 proto_tree_add_boolean_hidden(tree, hf_beep_intermediate, tvb, offset, 1, TRUE);
253 proto_tree_add_text(tree, tvb, offset, 1, "More: Intermediate");
263 proto_tree_add_boolean_hidden(tree, hf_beep_proto_viol, tvb, offset, 1, TRUE);
264 proto_tree_add_text(tree, tvb, offset, 1, "PROTOCOL VIOLATION: Expected More Flag (* or .)");
275 static void dissect_beep_status(tvbuff_t *tvb, int offset,
279 /* FIXME: We should return a value to indicate all OK. */
281 switch(tvb_get_guint8(tvb, offset)) {
286 proto_tree_add_boolean_hidden(tree, hf_beep_positive, tvb, offset, 1, TRUE);
287 proto_tree_add_text(tree, tvb, offset, 1, "Status: Positive");
295 proto_tree_add_boolean_hidden(tree, hf_beep_negative, tvb, offset, 1, TRUE);
296 proto_tree_add_text(tree, tvb, offset, 1, "Status: Negative");
301 default: /* Proto violation: FIXME */
310 static int num_len(tvbuff_t *tvb, int offset)
314 while (isdigit(tvb_get_guint8(tvb, offset + i))) i++;
321 * We check for a terminator. This can be CRLF, which will be recorded
322 * as a terminator, or CR or LF by itself, which will be redorded as
323 * an incorrect terminator ... We build the tree at this point
324 * However, we depend on the variable beep_strict_term
328 check_term(tvbuff_t *tvb, int offset, proto_tree *tree)
331 /* First, check for CRLF, or, if global_beep_strict_term is false,
332 * one of CR or LF ... If neither of these hold, we add an element
333 * that complains of a protocol violation, and return -1, else
334 * we add a terminator to the tree (possibly non-standard) and return
335 * the count of characters we saw ... This may throw off the rest of the
336 * dissection ... so-be-it!
339 if ((tvb_get_guint8(tvb, offset) == 0x0d &&
340 tvb_get_guint8(tvb, offset + 1) == 0x0a)){ /* Correct terminator */
343 proto_tree_add_text(tree, tvb, offset, 2, "Terminator: CRLF");
348 else if ((tvb_get_guint8(tvb, offset) == 0x0d) && !global_beep_strict_term) {
351 proto_tree_add_text(tree, tvb, offset, 1, "Nonstandard Terminator: CR");
352 proto_tree_add_boolean_hidden(tree, hf_beep_proto_viol, tvb, offset, 1, TRUE);
357 else if ((tvb_get_guint8(tvb, offset) == 0x0a) && !global_beep_strict_term) {
360 proto_tree_add_text(tree, tvb, offset, 1, "Nonstandard Terminator: LF");
361 proto_tree_add_boolean_hidden(tree, hf_beep_proto_viol, tvb, offset, 1, TRUE);
369 proto_tree_add_text(tree, tvb, offset, 2, "PROTOCOL VIOLATION, Invalid Terminator: %s", tvb_format_text(tvb, offset, 2));
370 proto_tree_add_boolean_hidden(tree, hf_beep_proto_viol, tvb, offset, 2, TRUE);
378 /* Get the header length, up to CRLF or CR or LF */
379 static int header_len(tvbuff_t *tvb, int offset)
384 /* FIXME: Have to make sure we stop looking at the end of the tvb ... */
386 /* We look for CRLF, or CR or LF if global_beep_strict_term is
392 if (tvb_ensure_length_remaining(tvb, offset + i) < 1)
393 return i; /* Not enough characters left ... */
395 if ((sc = tvb_get_guint8(tvb, offset + i)) == 0x0d
396 && tvb_get_guint8(tvb, offset + i + 1) == 0x0a)
397 return i; /* Done here ... */
399 if (!global_beep_strict_term && (sc == 0x0d || sc == 0x0a))
400 return i; /* Done here also ... */
408 dissect_beep_mime_header(tvbuff_t *tvb, int offset,
409 struct beep_proto_data *frame_data,
412 proto_tree *ti = NULL, *mime_tree = NULL;
413 int mime_length = header_len(tvb, offset), cc = 0;
415 if (frame_data && !frame_data->mime_hdr) return 0;
419 /* FIXME: Should calculate the whole length of the mime headers */
421 ti = proto_tree_add_text(tree, tvb, offset, mime_length, "Mime header: %s", tvb_format_text(tvb, offset, mime_length));
422 mime_tree = proto_item_add_subtree(ti, ett_mime_header);
425 if (mime_length == 0) { /* Default header */
428 proto_tree_add_text(mime_tree, tvb, offset, 0, "Default values");
431 if ((cc = check_term(tvb, offset, mime_tree)) <= 0) {
433 /* Ignore it, it will cause funnies in the rest of the dissect */
438 else { /* FIXME: Process the headers */
441 proto_tree_add_text(mime_tree, tvb, offset, mime_length, "Header: %s",
442 tvb_format_text(tvb, offset, mime_length));
445 if ((cc = check_term(tvb, offset + mime_length, mime_tree)) <= 0) {
447 /* Ignore it, it will cause funnies in the rest of the dissect */
453 return mime_length + cc; /* FIXME: Check that the CRLF is there */
458 dissect_beep_int(tvbuff_t *tvb, int offset,
459 proto_tree *tree, int hf, int *val, int *hfa[])
462 unsigned int i = num_len(tvb, offset);
463 guint8 int_buff[100];
465 memset(int_buff, '\0', sizeof(int_buff));
467 tvb_memcpy(tvb, int_buff, offset, MIN(sizeof(int_buff) - 1, i));
469 /* XXX - is this still "Dangerous" now that we don't copy to the
470 last byte of "int_buff[]"? */
471 sscanf(int_buff, "%d", &ival);
474 proto_tree_add_uint(tree, hf, tvb, offset, i, ival);
479 proto_tree_add_uint_hidden(tree, *hfa[ind], tvb, offset, i, ival);
484 *val = ival; /* Return the value */
491 set_mime_hdr_flags(int more, struct beep_request_val *request_val,
492 struct beep_proto_data *frame_data, packet_info *pinfo)
495 if (!request_val) return; /* Nothing to do ??? */
497 if (pinfo->destport == tcp_port) { /* Going to the server ... client */
499 if (request_val->c_mime_hdr) {
501 frame_data->mime_hdr = 0;
503 if (!more) request_val->c_mime_hdr = 0;
508 frame_data->mime_hdr = 1;
510 if (more) request_val->c_mime_hdr = 1;
517 if (request_val->s_mime_hdr) {
519 frame_data->mime_hdr = 0;
521 if (!more) request_val->s_mime_hdr = 0;
526 frame_data->mime_hdr = 1;
528 if (more) request_val->s_mime_hdr = 1;
538 * A return value of <= 0 says we bailed out, skip the rest of this message,
541 * A return value > 0 is the count of bytes we consumed ...
545 dissect_beep_tree(tvbuff_t *tvb, int offset, packet_info *pinfo,
546 proto_tree *tree, struct beep_request_val *request_val,
547 struct beep_proto_data *frame_data)
549 proto_tree *ti = NULL, *hdr = NULL;
550 int st_offset, msgno, ansno, seqno, size, channel, ackno, window, cc,
553 char * cmd_temp = NULL;
557 if (tvb_strneql(tvb, offset, "MSG ", 4) == 0)
558 cmd_temp = "Command: MSG";
559 if (tvb_strneql(tvb, offset, "RPY ", 4) == 0)
560 cmd_temp = "Command: RPY";
561 if (tvb_strneql(tvb, offset, "ERR ", 4) == 0)
562 cmd_temp = "Command: ERR";
563 if (tvb_strneql(tvb, offset, "NUL ", 4) == 0)
564 cmd_temp = "Command: NUL";
565 if (tvb_strneql(tvb, offset, "ANS ", 4) == 0) {
566 cmd_temp = "Command: ANS";
570 if (cmd_temp != NULL) {
573 ti = proto_tree_add_text(tree, tvb, offset, header_len(tvb, offset) + 2, "Header");
575 hdr = proto_item_add_subtree(ti, ett_header);
577 proto_tree_add_boolean_hidden(hdr, hf_beep_req, tvb, offset, 3, TRUE);
578 proto_tree_add_text(hdr, tvb, offset, 3, cmd_temp);
583 /* Get the channel */
584 offset += dissect_beep_int(tvb, offset, hdr, hf_beep_channel, &channel, req_chan_hfa);
585 offset += 1; /* Skip the space */
587 /* Dissect the message number */
588 offset += dissect_beep_int(tvb, offset, hdr, hf_beep_msgno, &msgno, req_msgno_hfa);
589 offset += 1; /* skip the space */
591 /* Insert the more elements ... */
592 if ((more = dissect_beep_more(tvb, offset, hdr)) >= 0) {
593 /* Figure out which direction this is in and what mime_hdr flag to
594 * add to the frame_data. If there are missing segments, this code
597 set_mime_hdr_flags(more, request_val, frame_data, pinfo);
599 else { /* Protocol violation, so dissect rest as undisectable */
601 proto_tree_add_text(hdr, tvb, offset,
602 tvb_length_remaining(tvb, offset),
603 "Undissected Payload: %s",
604 tvb_format_text(tvb, offset,
605 tvb_length_remaining(tvb, offset)
613 offset += 2; /* Skip the flag and the space ... */
615 /* now for the seqno */
616 offset += dissect_beep_int(tvb, offset, hdr, hf_beep_seqno, &seqno, req_seqno_hfa);
617 offset += 1; /* skip the space */
619 offset += dissect_beep_int(tvb, offset, hdr, hf_beep_size, &size, req_size_hfa);
620 if (request_val) /* FIXME, is this the right order ... */
621 request_val -> size = size; /* Stash this away */
623 frame_data->pl_size = size;
624 if (frame_data->pl_size < 0) frame_data->pl_size = 0; /* FIXME: OK? */
626 /* offset += 1; skip the space */
628 if (is_ANS) { /* We need to put in the ansno */
629 offset += 1; /* skip the space */
630 /* Dissect the message number */
631 offset += dissect_beep_int(tvb, offset, hdr, hf_beep_ansno, &ansno, req_ansno_hfa);
634 if ((cc = check_term(tvb, offset, hdr)) <= 0) {
636 /* We dissect the rest as data and bail ... */
639 proto_tree_add_text(hdr, tvb, offset,
640 tvb_length_remaining(tvb, offset),
641 "Undissected Payload: %s",
642 tvb_format_text(tvb, offset,
643 tvb_length_remaining(tvb, offset)
654 /* Insert MIME header ... */
656 if (frame_data && frame_data->mime_hdr)
657 offset += dissect_beep_mime_header(tvb, offset, frame_data, hdr);
659 /* Now for the payload, if any */
661 if (tvb_length_remaining(tvb, offset) > 0) { /* Dissect what is left as payload */
663 int pl_size = MIN(size, tvb_length_remaining(tvb, offset));
665 /* Except, check the payload length, and only dissect that much */
667 /* We need to keep track, in the conversation, of how much is left
668 * so in the next packet, we can figure out what is part of the payload
669 * and what is the next message
673 proto_tree_add_text(tree, tvb, offset, pl_size, "Payload: %s", tvb_format_text(tvb, offset, pl_size));
680 request_val->size -= pl_size;
681 if (request_val->size < 0) request_val->size = 0;
684 frame_data->pl_size -= pl_size;
685 if (frame_data->pl_size < 0) frame_data->pl_size = 0;
689 /* If anything else left, dissect it ... */
691 if (tvb_length_remaining(tvb, offset) > 0)
692 offset += dissect_beep_tree(tvb, offset, pinfo, tree, request_val, frame_data);
694 } else if (tvb_strneql(tvb, offset, "SEQ ", 4) == 0) {
697 proto_tree_add_boolean_hidden(tree, hf_beep_seq, tvb, offset, 3, TRUE);
698 proto_tree_add_text(tree, tvb, offset, 3, "Command: SEQ");
703 /* Now check the space: FIXME */
707 offset += dissect_beep_int(tvb, offset, tree, hf_beep_channel, &channel, seq_chan_hfa);
709 /* Check the space: FIXME */
713 offset += dissect_beep_int(tvb, offset, tree, hf_beep_ackno, &ackno, seq_ackno_hfa);
715 /* Check the space: FIXME */
719 offset += dissect_beep_int(tvb, offset, tree, hf_beep_window, &window, seq_window_hfa);
721 if ((cc = check_term(tvb, offset, tree)) <= 0) {
723 /* We dissect the rest as data and bail ... */
726 proto_tree_add_text(tree, tvb, offset,
727 tvb_length_remaining(tvb, offset),
728 "Undissected Payload: %s",
729 tvb_format_text(tvb, offset,
730 tvb_length_remaining(tvb, offset)
741 } else if (tvb_strneql(tvb, offset, "END", 3) == 0) {
743 proto_tree *tr = NULL;
746 ti = proto_tree_add_text(tree, tvb, offset, MIN(5, tvb_length_remaining(tvb, offset)), "Trailer");
748 tr = proto_item_add_subtree(ti, ett_trailer);
750 proto_tree_add_boolean_hidden(tr, hf_beep_end, tvb, offset, 3, TRUE);
751 proto_tree_add_text(tr, tvb, offset, 3, "Command: END");
757 if ((cc = check_term(tvb, offset, tr)) <= 0) {
759 /* We dissect the rest as data and bail ... */
762 proto_tree_add_text(tr, tvb, offset, tvb_length_remaining(tvb, offset),
763 "Undissected Payload: %s",
764 tvb_format_text(tvb, offset,
765 tvb_length_remaining(tvb, offset)
778 if (tvb_length_remaining(tvb, offset) > 0) { /* Dissect anything left over */
784 pl_size = MIN(request_val->size, tvb_length_remaining(tvb, offset));
786 if (pl_size == 0) { /* The whole of the rest must be payload */
788 pl_size = tvb_length_remaining(tvb, offset); /* Right place ? */
792 } else if (frame_data) {
793 pl_size = MIN(frame_data->pl_size, tvb_length_remaining(tvb, offset));
794 } else { /* Just in case */
795 pl_size = tvb_length_remaining(tvb, offset);
798 /* Take care here to handle the payload correctly, and if there is
799 * another message here, then handle it correctly as well.
802 /* If the pl_size == 0 and the offset == 0?, then we have not processed
803 * anything in this frame above, so we better treat all this data as
804 * payload to avoid recursion loops
807 if (pl_size == 0 && offset == st_offset)
808 pl_size = tvb_length_remaining(tvb, offset);
813 proto_tree_add_text(tree, tvb, offset, pl_size, "Payload: %s",
814 tvb_format_text(tvb, offset, pl_size));
817 offset += pl_size; /* Advance past the payload */
820 request_val->size -= pl_size; /* Reduce payload by what we added */
821 if (request_val->size < 0) request_val->size = 0;
824 frame_data->pl_size -= pl_size;
825 if (frame_data->pl_size < 0) frame_data->pl_size = 0;
829 if (tvb_length_remaining(tvb, offset) > 0) {
830 offset += dissect_beep_tree(tvb, offset, pinfo, tree, request_val, frame_data);
834 return offset - st_offset;
839 dissect_beep(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
842 struct beep_proto_data *frame_data = NULL;
843 proto_tree *beep_tree = NULL, *ti = NULL;
844 conversation_t *conversation = NULL;
845 struct beep_request_key request_key, *new_request_key;
846 struct beep_request_val *request_val = NULL;
850 /* If we have per frame data, use that, else, we must have lost the per-
851 * frame data, and we have to do a full dissect pass again.
853 * The per-frame data tells us how much of this frame is left over from a
854 * previous frame, so we dissect it as payload and then try to dissect the
857 * We use the conversation to build up info on the first pass over the
858 * packets of type BEEP, and record anything that is needed if the user
859 * does random dissects of packets in per packet data.
861 * Once we have per-packet data, we don't need the conversation stuff
862 * anymore, but if per-packet data and conversation stuff gets deleted, as
863 * it does under some circumstances when a rescan is done, it all gets
867 /* Find out what conversation this packet is part of ... but only
868 * if we have no information on this packet, so find the per-frame
872 frame_data = p_get_proto_data(pinfo->fd, proto_beep);
876 conversation = find_conversation(&pinfo->src, &pinfo->dst, pinfo->ptype,
877 pinfo->srcport, pinfo->destport, 0);
878 if (conversation == NULL) { /* No conversation, create one */
879 conversation = conversation_new(&pinfo->src, &pinfo->dst, pinfo->ptype,
880 pinfo->srcport, pinfo->destport, 0);
885 * Check for and insert an entry in the request table if does not exist
887 request_key.conversation = conversation->index;
889 request_val = (struct beep_request_val *)g_hash_table_lookup(beep_request_hash, &request_key);
891 if (!request_val) { /* Create one */
893 new_request_key = g_mem_chunk_alloc(beep_request_keys);
894 new_request_key->conversation = conversation->index;
896 request_val = g_mem_chunk_alloc(beep_request_vals);
897 request_val->processed = 0;
898 request_val->size = 0;
900 g_hash_table_insert(beep_request_hash, new_request_key, request_val);
905 if (check_col(pinfo->cinfo, COL_PROTOCOL))
906 col_set_str(pinfo->cinfo, COL_PROTOCOL, "BEEP");
908 if (check_col(pinfo->cinfo, COL_INFO)) { /* Check the type ... */
910 /* "tvb_format_text()" is passed a value that won't go past the end
911 * of the packet, so it won't throw an exception. */
912 col_add_str(pinfo->cinfo, COL_INFO, tvb_format_text(tvb, offset, tvb_length_remaining(tvb, offset)));
916 /* Here, we parse the message so we can retrieve the info we need, which
917 * is that there is some payload left from a previous segment on the
918 * front of this segment ... This all depends on TCP segments not getting
921 * As a huge kludge, we push the checking for the tree down into the code
922 * and process as if we were given a tree but not call the routines that
923 * adorn the protocol tree if they were NULL.
926 if (tree) { /* Build the tree info ... */
928 ti = proto_tree_add_item(tree, proto_beep, tvb, offset, -1, FALSE);
930 beep_tree = proto_item_add_subtree(ti, ett_beep);
934 /* Check the per-frame data and the conversation for any left-over
935 * payload from the previous frame
937 * We check that per-frame data exists first, and if so, use it,
938 * else we use the conversation data.
940 * We create per-frame data here as well, but we must ensure we create it
941 * after we have done the check for per-frame or conversation data.
943 * We also depend on the first frame in a group having a pl_size of 0.
946 if (frame_data && frame_data->pl_left > 0) {
948 int pl_left = frame_data->pl_left;
950 pl_left = MIN(pl_left, tvb_length_remaining(tvb, offset));
952 /* Add the payload bit, only if we have a tree */
954 proto_tree_add_text(beep_tree, tvb, offset, pl_left, "Payload: %s",
955 tvb_format_text(tvb, offset, pl_left));
959 else if (request_val && request_val->size > 0) {
961 int pl_left = request_val->size;
963 request_val->size = 0;
965 /* We create the frame data here for this case, and
966 * elsewhere for other frames
969 frame_data = g_mem_chunk_alloc(beep_packet_infos);
971 frame_data->pl_left = pl_left;
972 frame_data->pl_size = 0;
973 frame_data->mime_hdr = 0;
975 p_add_proto_data(pinfo->fd, proto_beep, frame_data);
979 /* Set up the per-frame data here if not already done so
980 * This _must_ come after the checks above ...
983 if (frame_data == NULL) {
985 frame_data = g_mem_chunk_alloc(beep_packet_infos);
987 frame_data->pl_left = 0;
988 frame_data->pl_size = 0;
989 frame_data->mime_hdr = 0;
991 p_add_proto_data(pinfo->fd, proto_beep, frame_data);
995 if (tvb_length_remaining(tvb, offset) > 0) {
997 offset += dissect_beep_tree(tvb, offset, pinfo, beep_tree, request_val, frame_data);
1003 /* Register all the bits needed with the filtering engine */
1006 proto_register_beep(void)
1008 static hf_register_info hf[] = {
1009 { &hf_beep_proto_viol,
1010 { "Protocol Violation", "beep.violation", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }},
1013 { "Request", "beep.req", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }},
1015 { &hf_beep_req_chan,
1016 { "Request Channel Number", "beep.req.channel", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }},
1019 { "Response", "beep.rsp", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }},
1021 { &hf_beep_rsp_chan,
1022 { "Response Channel Number", "beep.rsp.channel", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }},
1025 { "Sequence", "beep.seq", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }},
1027 { &hf_beep_seq_chan,
1028 { "Sequence Channel Number", "beep.seq.channel", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }},
1031 { "End", "beep.end", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }},
1033 { &hf_beep_complete,
1034 { "Complete", "beep.more.complete", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }},
1036 { &hf_beep_intermediate,
1037 { "Intermediate", "beep.more.intermediate", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }},
1040 { "Msgno", "beep.msgno", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }},
1043 { "Ansno", "beep.ansno", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }},
1046 { "Seqno", "beep.seqno", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }},
1049 { "Size", "beep.size", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }},
1052 { "Channel", "beep.channel", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }},
1054 { &hf_beep_negative,
1055 { "Negative", "beep.status.negative", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }},
1057 { &hf_beep_positive,
1058 { "Positive", "beep.status.positive", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }},
1061 { "Ackno", "beep.seq.ackno", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }},
1064 { "Window", "beep.seq.window", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }},
1067 static gint *ett[] = {
1073 module_t *beep_module;
1075 proto_beep = proto_register_protocol("Blocks Extensible Exchange Protocol",
1078 proto_register_field_array(proto_beep, hf, array_length(hf));
1079 proto_register_subtree_array(ett, array_length(ett));
1080 register_init_routine(&beep_init_protocol);
1082 /* Register our configuration options for BEEP, particularly our port */
1084 beep_module = prefs_register_protocol(proto_beep, proto_reg_handoff_beep);
1086 prefs_register_uint_preference(beep_module, "tcp.port", "BEEP TCP Port",
1087 "Set the port for BEEP messages (if other"
1088 " than the default of 10288)",
1089 10, &global_beep_tcp_port);
1091 prefs_register_bool_preference(beep_module, "strict_header_terminator",
1092 "BEEP Header Requires CRLF",
1093 "Specifies that BEEP requires CRLF as a "
1094 "terminator, and not just CR or LF",
1095 &global_beep_strict_term);
1098 /* The registration hand-off routine */
1100 proto_reg_handoff_beep(void)
1102 static int beep_prefs_initialized = FALSE;
1103 static dissector_handle_t beep_handle;
1105 if (!beep_prefs_initialized) {
1107 beep_handle = create_dissector_handle(dissect_beep, proto_beep);
1109 beep_prefs_initialized = TRUE;
1114 dissector_delete("tcp.port", tcp_port, beep_handle);
1118 /* Set our port number for future use */
1120 tcp_port = global_beep_tcp_port;
1122 dissector_add("tcp.port", global_beep_tcp_port, beep_handle);