forked from osmocom/wireshark
148 lines
3.6 KiB
C
148 lines
3.6 KiB
C
/* tap-protocolinfo.c
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* protohierstat 2002 Ronnie Sahlberg
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*
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* $Id$
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/* This module provides Protocol Column Info tap for twireshark */
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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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_cmd_args.h>
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#include "register.h"
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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=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 pinfo->cinfo is null
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* and, if so, we report that error and exit.
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*/
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if (pinfo->cinfo == NULL) {
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fprintf(stderr, "twireshark: the proto,colinfo tap doesn't work if the columns aren'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=proto_construct_dfilter_string(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 *optarg, 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,",optarg,14)){
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filter=optarg+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, "twireshark: 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, "twireshark: Field \"%s\" doesn't exist.\n", field);
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exit(1);
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}
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rs=g_malloc(sizeof(pci_t));
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rs->hf_index=hfi->id;
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if((field-filter)>1){
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rs->filter=g_malloc(field-filter);
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strncpy(rs->filter,filter,(field-filter)-1);
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rs->filter[(field-filter)-1]=0;
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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, 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, "twireshark: 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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if(rs->filter){
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g_free(rs->filter);
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}
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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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void
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register_tap_listener_protocolinfo(void)
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{
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register_stat_cmd_arg("proto,colinfo,", protocolinfo_init,NULL);
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}
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