cdfab0d6e9
A few of them just needed scratch memory, so allocate and free it manually after doing any exception-raising checks. A few others were returning memory, and needed conversion to accept a wmem scope argument.
344 lines
9.6 KiB
C
344 lines
9.6 KiB
C
/* packet-kismet.c
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* Routines for kismet packet dissection
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* Copyright 2006, Krzysztof Burghardt <krzysztof@burghardt.pl>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* Copied from packet-pop.c
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <epan/packet.h>
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#include <epan/to_str.h>
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#include <epan/strutil.h>
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#include <epan/expert.h>
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#include <wsutil/strtoi.h>
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static int proto_kismet = -1;
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static int hf_kismet_response = -1;
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static int hf_kismet_request = -1;
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static int hf_kismet_version = -1;
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static int hf_kismet_start_time = -1;
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static int hf_kismet_server_name = -1;
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static int hf_kismet_build_revision = -1;
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static int hf_kismet_unknown_field = -1;
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static int hf_kismet_extended_version_string = -1;
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static int hf_kismet_time = -1;
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static gint ett_kismet = -1;
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static gint ett_kismet_reqresp = -1;
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static expert_field ei_time_invalid = EI_INIT;
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#define TCP_PORT_KISMET 2501 /* Not IANA registered */
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static gboolean response_is_continuation(const guchar * data);
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void proto_reg_handoff_kismet(void);
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void proto_register_kismet(void);
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static int
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dissect_kismet(tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, void * data _U_)
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{
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gboolean is_request;
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gboolean is_continuation;
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proto_tree *kismet_tree=NULL, *reqresp_tree=NULL;
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proto_item *ti;
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proto_item *tmp_item;
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gint offset = 0;
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const guchar *line;
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gint next_offset;
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int linelen;
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int tokenlen;
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int i;
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const guchar *next_token;
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/*
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* Find the end of the first line.
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*
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* Note that "tvb_find_line_end()" will return a value that is
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* not longer than what's in the buffer, so the "tvb_get_ptr()"
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* call won't throw an exception.
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*/
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linelen = tvb_find_line_end(tvb, offset, -1, &next_offset, FALSE);
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line = tvb_get_ptr(tvb, offset, linelen);
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/*
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* Check if it is an ASCII based protocol with reasonable length
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* packets, if not return, and try another dissector.
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*/
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if (linelen < 8) {
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/*
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* Packet is too short
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*/
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return 0;
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} else {
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for (i = 0; i < 8; ++i) {
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/*
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* Packet contains non-ASCII data
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*/
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if (line[i] < 32 || line[i] > 128)
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return 0;
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}
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}
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/*
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* If it is Kismet traffic set COL_PROTOCOL.
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*/
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "kismet");
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/*
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* Check if it is request, reply or continuation.
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*/
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if (pinfo->match_uint == pinfo->destport) {
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is_request = TRUE;
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is_continuation = FALSE;
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} else {
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is_request = FALSE;
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is_continuation = response_is_continuation (line);
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}
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/*
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* Put the first line from the buffer into the summary
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* if it's a kismet request or reply (but leave out the
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* line terminator).
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* Otherwise, just call it a continuation.
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*/
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if (is_continuation)
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col_set_str(pinfo->cinfo, COL_INFO, "Continuation");
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else
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s: %s",
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is_request ? "Request" : "Response",
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format_text(pinfo->pool, line, linelen));
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if (tree) {
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ti = proto_tree_add_item(tree, proto_kismet, tvb, offset, -1, ENC_NA);
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kismet_tree = proto_item_add_subtree(ti, ett_kismet);
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}
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if (is_continuation) {
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/*
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* Put the whole packet into the tree as data.
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*/
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call_data_dissector(tvb, pinfo, kismet_tree);
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return tvb_captured_length(tvb);
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}
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if (is_request) {
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tmp_item = proto_tree_add_boolean(kismet_tree,
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hf_kismet_request, tvb, 0, 0, TRUE);
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} else {
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tmp_item = proto_tree_add_boolean(kismet_tree,
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hf_kismet_response, tvb, 0, 0, TRUE);
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}
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proto_item_set_generated (tmp_item);
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while (tvb_offset_exists(tvb, offset)) {
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/*
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* Find the end of the line.
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*/
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linelen = tvb_find_line_end(tvb, offset, -1, &next_offset, FALSE);
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if (linelen) {
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/*
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* Put this line.
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*/
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reqresp_tree = proto_tree_add_subtree(kismet_tree, tvb, offset,
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next_offset - offset, ett_kismet_reqresp, NULL,
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tvb_format_text(pinfo->pool, tvb, offset,
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next_offset - offset - 1));
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tokenlen = get_token_len(line, line + linelen, &next_token);
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if (tokenlen != 0) {
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guint8 *reqresp;
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reqresp = tvb_get_string_enc(pinfo->pool, tvb, offset, tokenlen, ENC_ASCII);
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if (is_request) {
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/*
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* No request dissection
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*/
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} else {
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/*
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* *KISMET: {Version} {Start time} \001{Server name}\001 {Build Revision}
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* two fields left undocumented: {???} {?ExtendedVersion?}
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*/
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if (!strncmp(reqresp, "*KISMET", 7)) {
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offset += (gint) (next_token - line);
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linelen -= (int) (next_token - line);
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line = next_token;
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tokenlen = get_token_len(line, line + linelen, &next_token);
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proto_tree_add_string(reqresp_tree, hf_kismet_version, tvb, offset,
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tokenlen, format_text(pinfo->pool, line, tokenlen));
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offset += (gint) (next_token - line);
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linelen -= (int) (next_token - line);
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line = next_token;
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tokenlen = get_token_len(line, line + linelen, &next_token);
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proto_tree_add_string(reqresp_tree, hf_kismet_start_time, tvb, offset,
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tokenlen, format_text(pinfo->pool, line, tokenlen));
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offset += (gint) (next_token - line);
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linelen -= (int) (next_token - line);
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line = next_token;
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tokenlen = get_token_len(line, line + linelen, &next_token);
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proto_tree_add_string(reqresp_tree, hf_kismet_server_name, tvb, offset,
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tokenlen, format_text(pinfo->pool, line + 1, tokenlen - 2));
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offset += (gint) (next_token - line);
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linelen -= (int) (next_token - line);
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line = next_token;
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tokenlen = get_token_len(line, line + linelen, &next_token);
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proto_tree_add_string(reqresp_tree, hf_kismet_build_revision, tvb, offset,
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tokenlen, format_text(pinfo->pool, line, tokenlen));
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offset += (gint) (next_token - line);
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linelen -= (int) (next_token - line);
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line = next_token;
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tokenlen = get_token_len(line, line + linelen, &next_token);
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proto_tree_add_string(reqresp_tree, hf_kismet_unknown_field, tvb, offset,
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tokenlen, format_text(pinfo->pool, line, tokenlen));
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offset += (gint) (next_token - line);
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linelen -= (int) (next_token - line);
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line = next_token;
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tokenlen = get_token_len(line, line + linelen, &next_token);
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proto_tree_add_string(reqresp_tree, hf_kismet_extended_version_string, tvb, offset,
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tokenlen, format_text(pinfo->pool, line, tokenlen));
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}
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/*
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* *TIME: {Time}
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*/
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if (!strncmp(reqresp, "*TIME", 5)) {
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nstime_t t;
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char *ptr = NULL;
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proto_tree* time_item;
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t.nsecs = 0;
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offset += (gint) (next_token - line);
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linelen -= (int) (next_token - line);
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line = next_token;
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tokenlen = get_token_len(line, line + linelen, &next_token);
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/* Convert form ascii to nstime */
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if (ws_strtou64(format_text(pinfo->pool, line, tokenlen), NULL, (guint64*)&t.secs)) {
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/*
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* Format ascii representation of time
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*/
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ptr = abs_time_secs_to_str(pinfo->pool, t.secs, ABSOLUTE_TIME_LOCAL, TRUE);
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}
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time_item = proto_tree_add_time_format_value(reqresp_tree, hf_kismet_time, tvb, offset,
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tokenlen, &t, "%s", ptr ? ptr : "");
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if (!ptr)
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expert_add_info(pinfo, time_item, &ei_time_invalid);
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}
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}
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/*offset += (gint) (next_token - line);
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linelen -= (int) (next_token - line);*/
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line = next_token;
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}
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}
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offset = next_offset;
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}
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return tvb_captured_length(tvb);
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}
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static gboolean
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response_is_continuation(const guchar * data)
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{
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if (!strncmp(data, "*", 1))
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return FALSE;
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if (!strncmp(data, "!", 1))
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return FALSE;
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return TRUE;
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}
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void
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proto_register_kismet(void)
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{
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static hf_register_info hf[] = {
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{&hf_kismet_response,
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{"Response", "kismet.response", FT_BOOLEAN, BASE_NONE,
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NULL, 0x0, "TRUE if kismet response", HFILL}},
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{&hf_kismet_request,
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{"Request", "kismet.request", FT_BOOLEAN, BASE_NONE,
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NULL, 0x0, "TRUE if kismet request", HFILL}},
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{&hf_kismet_version,
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{"Version", "kismet.version", FT_STRING, BASE_NONE,
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NULL, 0x0, NULL, HFILL}},
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{&hf_kismet_start_time,
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{"Start time", "kismet.start_time", FT_STRING, BASE_NONE,
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NULL, 0x0, NULL, HFILL}},
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{&hf_kismet_server_name,
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{"Server name", "kismet.server_name", FT_STRING, BASE_NONE,
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NULL, 0x0, NULL, HFILL}},
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{&hf_kismet_build_revision,
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{"Build revision", "kismet.build_revision", FT_STRING, BASE_NONE,
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NULL, 0x0, NULL, HFILL}},
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{&hf_kismet_unknown_field,
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{"Unknown field", "kismet.unknown_field", FT_STRING, BASE_NONE,
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NULL, 0x0, NULL, HFILL}},
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{&hf_kismet_extended_version_string,
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{"Extended version string", "kismet.extended_version_string", FT_STRING, BASE_NONE,
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NULL, 0x0, NULL, HFILL}},
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{&hf_kismet_time,
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{"Time", "kismet.time", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL,
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NULL, 0x0, NULL, HFILL}},
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};
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static ei_register_info ei[] = {
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{ &ei_time_invalid, { "kismet.time.invalid", PI_PROTOCOL, PI_WARN, "Invalid time", EXPFILL }}
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};
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static gint *ett[] = {
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&ett_kismet,
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&ett_kismet_reqresp,
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};
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expert_module_t* expert_kismet;
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proto_kismet = proto_register_protocol("Kismet Client/Server Protocol", "Kismet", "kismet");
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proto_register_field_array(proto_kismet, hf, array_length (hf));
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proto_register_subtree_array(ett, array_length (ett));
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expert_kismet = expert_register_protocol(proto_kismet);
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expert_register_field_array(expert_kismet, ei, array_length(ei));
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}
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void
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proto_reg_handoff_kismet(void)
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{
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dissector_handle_t kismet_handle;
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kismet_handle = create_dissector_handle(dissect_kismet, proto_kismet);
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dissector_add_uint_with_preference("tcp.port", TCP_PORT_KISMET, kismet_handle);
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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