forked from osmocom/wireshark
151 lines
3.4 KiB
C
151 lines
3.4 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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* SPDX-License-Identifier: GPL-2.0-or-later
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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/tap.h>
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#include <epan/stat_tap_ui.h>
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#include <wsutil/cmdarg_err.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 tap_packet_status
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protocolinfo_packet(void *prs, packet_info *pinfo, epan_dissect_t *edt, const void *dummy _U_, tap_flags_t flags _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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* XXX - report the error and just return TAP_PACKET_FAILED?
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*/
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if (!col_get_writable(pinfo->cinfo, COL_INFO)) {
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cmdarg_err("the proto,colinfo tap doesn't work if the INFO column isn't being printed.");
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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 TAP_PACKET_DONT_REDRAW;
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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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wmem_free(NULL, str);
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}
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}
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return TAP_PACKET_DONT_REDRAW;
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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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cmdarg_err("invalid \"-z proto,colinfo,<filter>,<field>\" argument");
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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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cmdarg_err("Field \"%s\" doesn't exist.", 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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(void) 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, 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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cmdarg_err("Couldn't register proto,colinfo tap: %s",
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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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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 - 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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