362 lines
10 KiB
C
362 lines
10 KiB
C
/* tap-rpcstat.c
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* rpcstat 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 rpc call/reply RTT statistics to twireshark.
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* It is only used by twireshark and not wireshark
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*
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* It serves as an example on how to use the tap api.
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*/
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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/packet_info.h"
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#include <epan/tap.h>
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#include <epan/stat_cmd_args.h>
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#include <epan/dissectors/packet-rpc.h>
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#include "register.h"
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/* used to keep track of statistics for a specific procedure */
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typedef struct _rpc_procedure_t {
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const char *proc;
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int num;
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nstime_t min;
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nstime_t max;
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nstime_t tot;
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} rpc_procedure_t;
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/* used to keep track of the statistics for an entire program interface */
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typedef struct _rpcstat_t {
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const char *prog;
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char *filter;
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guint32 program;
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guint32 version;
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guint32 num_procedures;
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rpc_procedure_t *procedures;
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} rpcstat_t;
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/* This callback is never used by twireshark but it is here for completeness.
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* When registering below, we could just have left this function as NULL.
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*
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* When used by wireshark, this function will be called whenever we would need
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* to reset all state. Such as when wireshark opens a new file, when it
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* starts a new capture, when it rescans the packetlist after some prefs have
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* changed etc.
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* So if your aplication has some state it needs to clean up in those
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* situations, here is a good place to put that code.
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*/
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static void
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rpcstat_reset(void *prs)
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{
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rpcstat_t *rs=prs;
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guint32 i;
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for(i=0;i<rs->num_procedures;i++){
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rs->procedures[i].num=0;
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rs->procedures[i].min.secs=0;
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rs->procedures[i].min.nsecs=0;
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rs->procedures[i].max.secs=0;
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rs->procedures[i].max.nsecs=0;
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rs->procedures[i].tot.secs=0;
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rs->procedures[i].tot.nsecs=0;
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}
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}
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/* This callback is invoked whenever the tap system has seen a packet
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* we might be interested in.
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* The function is to be used to only update internal state information
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* in the *tapdata structure, and if there were state changes which requires
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* the window to be redrawn, return 1 and (*draw) will be called sometime
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* later.
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*
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* This function should be as lightweight as possible since it executes together
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* with the normal wireshark dissectors. Try to push as much processing as
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* possible into (*draw) instead since that function executes asynchronously
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* and does not affect the main threads performance.
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*
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* If it is possible, try to do all "filtering" explicitely as we do below in
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* this example since you will get MUCH better performance than applying
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* a similar display-filter in the register call.
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*
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* The third parameter is tap dependant. Since we register this one to the "rpc"
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* tap the third parameters type is rpc_call_info_value.
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*
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*
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* The filtering we do is just to check the rpc_call_info_value struct that
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* we were called for the proper program and version. We didnt apply a filter
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* when we registered so we will be called for ALL rpc packets and not just
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* the ones we are collecting stats for.
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*
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*
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* function returns :
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* 0: no updates, no need to call (*draw) later
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* !0: state has changed, call (*draw) sometime later
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*/
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static int
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rpcstat_packet(void *prs, packet_info *pinfo, epan_dissect_t *edt _U_, const void *pri)
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{
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rpcstat_t *rs=prs;
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const rpc_call_info_value *ri=pri;
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nstime_t delta;
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rpc_procedure_t *rp;
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if(ri->proc>=rs->num_procedures){
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/* dont handle this since its outside of known table */
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return 0;
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}
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/* we are only interested in reply packets */
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if(ri->request){
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return 0;
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}
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/* we are only interested in certain program/versions */
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if( (ri->prog!=rs->program) || (ri->vers!=rs->version) ){
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return 0;
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}
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rp=&(rs->procedures[ri->proc]);
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/* calculate time delta between request and reply */
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nstime_delta(&delta, &pinfo->fd->abs_ts, &ri->req_time);
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if(rp->num==0){
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rp->max.secs=delta.secs;
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rp->max.nsecs=delta.nsecs;
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}
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if(rp->num==0){
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rp->min.secs=delta.secs;
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rp->min.nsecs=delta.nsecs;
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}
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if( (delta.secs<rp->min.secs)
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||( (delta.secs==rp->min.secs)
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&&(delta.nsecs<rp->min.nsecs) ) ){
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rp->min.secs=delta.secs;
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rp->min.nsecs=delta.nsecs;
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}
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if( (delta.secs>rp->max.secs)
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||( (delta.secs==rp->max.secs)
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&&(delta.nsecs>rp->max.nsecs) ) ){
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rp->max.secs=delta.secs;
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rp->max.nsecs=delta.nsecs;
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}
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rp->tot.secs += delta.secs;
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rp->tot.nsecs += delta.nsecs;
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if(rp->tot.nsecs>1000000000){
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rp->tot.nsecs-=1000000000;
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rp->tot.secs++;
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}
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rp->num++;
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return 1;
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}
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/* This callback is used when twireshark wants us to draw/update our
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* data to the output device. Since this is twireshark only output is
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* stdout.
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* Twireshark will only call this callback once, which is when twireshark has
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* finished reading all packets and exists.
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* If used with wireshark this may be called any time, perhaps once every 3
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* seconds or so.
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* This function may even be called in parallell with (*reset) or (*draw)
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* so make sure there are no races. The data in the rpcstat_t can thus change
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* beneath us. Beware.
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*/
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static void
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rpcstat_draw(void *prs)
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{
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rpcstat_t *rs=prs;
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guint32 i;
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#ifdef G_HAVE_UINT64
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guint64 td;
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#else
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guint32 td;
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#endif
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printf("\n");
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printf("===================================================================\n");
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printf("%s Version %d RTT Statistics:\n", rs->prog, rs->version);
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printf("Filter: %s\n",rs->filter?rs->filter:"");
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printf("Procedure Calls Min RTT Max RTT Avg RTT\n");
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for(i=0;i<rs->num_procedures;i++){
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/* scale it to units of 10us.*/
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/* for long captures with a large tot time, this can overflow on 32bit */
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td=(int)rs->procedures[i].tot.secs;
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td=td*100000+(int)rs->procedures[i].tot.nsecs/10000;
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if(rs->procedures[i].num){
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td/=rs->procedures[i].num;
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} else {
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td=0;
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}
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printf("%-15s %6d %3d.%05d %3d.%05d %3d.%05d\n",
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rs->procedures[i].proc,
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rs->procedures[i].num,
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(int)rs->procedures[i].min.secs,rs->procedures[i].min.nsecs/10000,
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(int)rs->procedures[i].max.secs,rs->procedures[i].max.nsecs/10000,
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td/100000, td%100000
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);
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}
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printf("===================================================================\n");
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}
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static guint32 rpc_program=0;
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static guint32 rpc_version=0;
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static gint32 rpc_min_proc=-1;
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static gint32 rpc_max_proc=-1;
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static void *
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rpcstat_find_procs(gpointer *key, gpointer *value _U_, gpointer *user_data _U_)
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{
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rpc_proc_info_key *k=(rpc_proc_info_key *)key;
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if(k->prog!=rpc_program){
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return NULL;
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}
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if(k->vers!=rpc_version){
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return NULL;
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}
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if(rpc_min_proc==-1){
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rpc_min_proc=k->proc;
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rpc_max_proc=k->proc;
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}
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if((gint32)k->proc<rpc_min_proc){
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rpc_min_proc=k->proc;
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}
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if((gint32)k->proc>rpc_max_proc){
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rpc_max_proc=k->proc;
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}
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return NULL;
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}
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/* When called, this function will create a new instance of rpcstat.
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* program and version are whick onc-rpc program/version we want to
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* collect statistics for.
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* This function is called from twireshark when it parses the -z rpc, arguments
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* and it creates a new instance to store statistics in and registers this
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* new instance for the rpc tap.
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*/
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static void
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rpcstat_init(const char *optarg, void* userdata _U_)
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{
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rpcstat_t *rs;
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guint32 i;
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int program, version;
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int pos=0;
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const char *filter=NULL;
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GString *error_string;
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if(sscanf(optarg,"rpc,rtt,%d,%d,%n",&program,&version,&pos)==2){
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if(pos){
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filter=optarg+pos;
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} else {
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filter=NULL;
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}
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} else {
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fprintf(stderr, "twireshark: invalid \"-z rpc,rtt,<program>,<version>[,<filter>]\" argument\n");
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exit(1);
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}
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rs=g_malloc(sizeof(rpcstat_t));
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rs->prog=rpc_prog_name(program);
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rs->program=program;
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rs->version=version;
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if(filter){
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rs->filter=g_malloc(strlen(filter)+1);
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strcpy(rs->filter, filter);
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} else {
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rs->filter=NULL;
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}
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rpc_program=program;
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rpc_version=version;
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rpc_min_proc=-1;
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rpc_max_proc=-1;
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g_hash_table_foreach(rpc_procs, (GHFunc)rpcstat_find_procs, NULL);
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if(rpc_min_proc==-1){
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fprintf(stderr,"twireshark: Invalid -z rpc,rrt,%d,%d\n",rpc_program,rpc_version);
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fprintf(stderr," Program:%d version:%d isn't supported by twireshark.\n", rpc_program, rpc_version);
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exit(1);
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}
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rs->num_procedures=rpc_max_proc+1;
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rs->procedures=g_malloc(sizeof(rpc_procedure_t)*(rs->num_procedures+1));
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for(i=0;i<rs->num_procedures;i++){
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rs->procedures[i].proc=rpc_proc_name(program, version, i);
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rs->procedures[i].num=0;
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rs->procedures[i].min.secs=0;
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rs->procedures[i].min.nsecs=0;
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rs->procedures[i].max.secs=0;
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rs->procedures[i].max.nsecs=0;
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rs->procedures[i].tot.secs=0;
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rs->procedures[i].tot.nsecs=0;
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}
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/* It is possible to create a filter and attach it to the callbacks. Then the
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* callbacks would only be invoked if the filter matched.
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* Evaluating filters is expensive and if we can avoid it and not use them
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* we gain performance.
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* In this case we do the filtering for protocol and version inside the
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* callback itself but use whatever filter the user provided.
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* (Perhaps the user only want the stats for nis+ traffic for certain objects?)
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*
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*/
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error_string=register_tap_listener("rpc", rs, filter, rpcstat_reset, rpcstat_packet, rpcstat_draw);
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if(error_string){
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/* error, we failed to attach to the tap. clean up */
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g_free(rs->procedures);
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g_free(rs->filter);
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g_free(rs);
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fprintf(stderr, "twireshark: Couldn't register rpc,rtt tap: %s\n",
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error_string->str);
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g_string_free(error_string, TRUE);
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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_rpcstat(void)
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{
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register_stat_cmd_arg("rpc,rtt,", rpcstat_init,NULL);
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}
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