forked from osmocom/wireshark
161 lines
4.0 KiB
C
161 lines
4.0 KiB
C
/* tap-protocolinfo.c
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* protohierstat 2002 Ronnie Sahlberg
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/* This module provides Protocol Column Info tap for tshark */
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "epan/epan_dissect.h"
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#include "epan/column-utils.h"
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#include "epan/proto.h"
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#include <epan/tap.h>
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#include <epan/stat_tap_ui.h>
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#include <epan/strutil.h>
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void register_tap_listener_protocolinfo(void);
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typedef struct _pci_t {
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char *filter;
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int hf_index;
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} pci_t;
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static int
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protocolinfo_packet(void *prs, packet_info *pinfo, epan_dissect_t *edt, const void *dummy _U_)
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{
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pci_t *rs = (pci_t *)prs;
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GPtrArray *gp;
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guint i;
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char *str;
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/*
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* XXX - there needs to be a way for "protocolinfo_init()" to
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* find out whether the columns are being generated and, if not,
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* to report an error and exit, as the whole point of this tap
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* is to modify the columns, and if the columns aren't being
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* displayed, that makes this tap somewhat pointless.
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*
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* To prevent a crash, we check whether INFO column is writable
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* and, if not, we report that error and exit.
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*/
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if (!col_get_writable(pinfo->cinfo)) {
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fprintf(stderr, "tshark: the proto,colinfo tap doesn't work if the INFO column isn't being printed.\n");
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exit(1);
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}
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gp = proto_get_finfo_ptr_array(edt->tree, rs->hf_index);
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if (!gp) {
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return 0;
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}
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for (i=0; i<gp->len; i++) {
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str = (char *)proto_construct_match_selected_string((field_info *)gp->pdata[i], NULL);
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if (str) {
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col_append_fstr(pinfo->cinfo, COL_INFO, " %s", str);
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}
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}
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return 0;
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}
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static void
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protocolinfo_init(const char *opt_arg, void *userdata _U_)
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{
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pci_t *rs;
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const char *field = NULL;
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const char *filter = NULL;
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header_field_info *hfi;
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GString *error_string;
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if (!strncmp("proto,colinfo,", opt_arg, 14)) {
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filter = opt_arg+14;
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field = strchr(filter, ',');
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if (field) {
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field += 1; /* skip the ',' */
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}
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}
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if (!field) {
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fprintf(stderr, "tshark: invalid \"-z proto,colinfo,<filter>,<field>\" argument\n");
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exit(1);
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}
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hfi = proto_registrar_get_byname(field);
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if (!hfi) {
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fprintf(stderr, "tshark: Field \"%s\" doesn't exist.\n", field);
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exit(1);
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}
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rs = g_new(pci_t, 1);
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rs->hf_index = hfi->id;
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if ((field-filter) > 1) {
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rs->filter = (char *)g_malloc(field-filter);
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g_strlcpy(rs->filter, filter, (field-filter));
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} else {
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rs->filter = NULL;
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}
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error_string = register_tap_listener("frame", rs, rs->filter, TL_REQUIRES_PROTO_TREE, NULL, protocolinfo_packet, NULL);
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if (error_string) {
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/* error, we failed to attach to the tap. complain and clean up */
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fprintf(stderr, "tshark: Couldn't register proto,colinfo tap: %s\n",
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error_string->str);
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g_string_free(error_string, TRUE);
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g_free(rs->filter);
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g_free(rs);
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exit(1);
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}
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}
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static stat_tap_ui protocolinfo_ui = {
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REGISTER_STAT_GROUP_GENERIC,
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NULL,
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"proto,colinfo,",
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protocolinfo_init,
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-1,
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0,
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NULL
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};
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void
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register_tap_listener_protocolinfo(void)
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{
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register_stat_tap_ui(&protocolinfo_ui, NULL);
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}
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/*
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* Editor modelines - http://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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