modules/m_trace.c

   1 /*
   2  *  ircd-ratbox: A slightly useful ircd.
   3  *  m_trace.c: Traces a path to a client/server.
   4  *
   5  *  Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
   6  *  Copyright (C) 1996-2002 Hybrid Development Team
   7  *  Copyright (C) 2002-2005 ircd-ratbox development team
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  22  *  USA
  23  *
  24  */
  25
  26 #include "stdinc.h"
  27 #include "class.h"
  28 #include "hook.h"
  29 #include "client.h"
  30 #include "hash.h"
  31 #include "common.h"
  32 #include "hash.h"
  33 #include "match.h"
  34 #include "ircd.h"
  35 #include "numeric.h"
  36 #include "s_serv.h"
  37 #include "s_conf.h"
  38 #include "s_newconf.h"
  39 #include "send.h"
  40 #include "msg.h"
  41 #include "parse.h"
  42 #include "modules.h"
  43
  44 static int m_trace(struct Client *, struct Client *, int, const char **);
  45
  46 static void trace_spy(struct Client *, struct Client *);
  47
  48 struct Message trace_msgtab = {
  49         "TRACE", 0, 0, 0, MFLG_SLOW,
  50         {mg_unreg, {m_trace, 0}, {m_trace, 0}, mg_ignore, mg_ignore, {m_trace, 0}}
  51 };
  52
  53 int doing_trace_hook;
  54
  55 mapi_clist_av1 trace_clist[] = { &trace_msgtab, NULL };
  56 mapi_hlist_av1 trace_hlist[] = {
  57         { "doing_trace",        &doing_trace_hook },
  58         { NULL, NULL }
  59 };
  60 DECLARE_MODULE_AV1(trace, NULL, NULL, trace_clist, trace_hlist, NULL, "$Revision: 3183 $");
  61
  62 static void count_downlinks(struct Client *server_p, int *pservcount, int *pusercount);
  63 static int report_this_status(struct Client *source_p, struct Client *target_p);
  64
  65 static const char *empty_sockhost = "255.255.255.255";
  66
  67 /*
  68  * m_trace
  69  *      parv[1] = servername
  70  */
  71 static int
  72 m_trace(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  73 {
  74         struct Client *target_p = NULL;
  75         struct Class *cltmp;
  76         const char *tname;
  77         int doall = 0;
  78         int cnt = 0, wilds, dow;
  79         rb_dlink_node *ptr;
  80
  81         if(parc > 1)
  82         {
  83                 tname = parv[1];
  84
  85                 if(parc > 2)
  86                 {
  87                         if(hunt_server(client_p, source_p, ":%s TRACE %s :%s", 2, parc, parv) !=
  88                                         HUNTED_ISME)
  89                                 return 0;
  90                 }
  91         }
  92         else
  93                 tname = me.name;
  94
  95         /* if we have 3 parameters, then the command is directed at us.  So
  96          * we shouldnt be forwarding it anywhere.
  97          */
  98         if(parc < 3)
  99         {
 100                 switch (hunt_server(client_p, source_p, ":%s TRACE :%s", 1, parc, parv))
 101                 {
 102                 case HUNTED_PASS:       /* note: gets here only if parv[1] exists */
 103                 {
 104                         struct Client *ac2ptr;
 105
 106                         if(MyClient(source_p))
 107                                 ac2ptr = find_named_client(tname);
 108                         else
 109                                 ac2ptr = find_client(tname);
 110
 111                         if(ac2ptr == NULL)
 112                         {
 113                                 RB_DLINK_FOREACH(ptr, global_client_list.head)
 114                                 {
 115                                         ac2ptr = ptr->data;
 116
 117                                         if(match(tname, ac2ptr->name))
 118                                                 break;
 119                                         else
 120                                                 ac2ptr = NULL;
 121                                 }
 122                         }
 123
 124                         /* giving this out with flattened links defeats the
 125                          * object --fl
 126                          */
 127                         if(IsOper(source_p) || IsExemptShide(source_p) ||
 128                            !ConfigServerHide.flatten_links)
 129                                 sendto_one_numeric(source_p, RPL_TRACELINK,
 130                                                    form_str(RPL_TRACELINK),
 131                                                    ircd_version,
 132                                                    ac2ptr ? ac2ptr->name : tname,
 133                                                    ac2ptr ? ac2ptr->from->name : "EEK!");
 134
 135                         return 0;
 136                 }
 137
 138                 case HUNTED_ISME:
 139                         break;
 140
 141                 default:
 142                         return 0;
 143                 }
 144         }
 145
 146         if(match(tname, me.name))
 147         {
 148                 doall = 1;
 149         }
 150         /* if theyre tracing our SID, we need to move tname to our name so
 151          * we dont give the sid in ENDOFTRACE
 152          */
 153         else if(!MyClient(source_p) && !strcmp(tname, me.id))
 154         {
 155                 doall = 1;
 156                 tname = me.name;
 157         }
 158
 159         wilds = strchr(tname, '*') || strchr(tname, '?');
 160         dow = wilds || doall;
 161
 162         /* specific trace */
 163         if(dow == 0)
 164         {
 165                 if(MyClient(source_p) || parc > 2)
 166                         target_p = find_named_person(tname);
 167                 else
 168                         target_p = find_person(tname);
 169
 170                 /* tname could be pointing to an ID at this point, so reset
 171                  * it to target_p->name if we have a target --fl
 172                  */
 173                 if(target_p != NULL)
 174                 {
 175                         report_this_status(source_p, target_p);
 176                         tname = target_p->name;
 177                 }
 178
 179                 trace_spy(source_p, target_p);
 180
 181                 sendto_one_numeric(source_p, RPL_ENDOFTRACE,
 182                                    form_str(RPL_ENDOFTRACE), tname);
 183                 return 0;
 184         }
 185
 186         trace_spy(source_p, NULL);
 187
 188         /* give non-opers a limited trace output of themselves (if local),
 189          * opers and servers (if no shide) --fl
 190          */
 191         if(!IsOper(source_p))
 192         {
 193                 if(MyClient(source_p))
 194                 {
 195                         if(doall || (wilds && match(tname, source_p->name)))
 196                                 report_this_status(source_p, source_p);
 197                 }
 198
 199                 RB_DLINK_FOREACH(ptr, local_oper_list.head)
 200                 {
 201                         target_p = ptr->data;
 202
 203                         if(!doall && wilds && (match(tname, target_p->name) == 0))
 204                                 continue;
 205
 206                         report_this_status(source_p, target_p);
 207                 }
 208
 209                 if (IsExemptShide(source_p) || !ConfigServerHide.flatten_links)
 210                 {
 211                         RB_DLINK_FOREACH(ptr, serv_list.head)
 212                         {
 213                                 target_p = ptr->data;
 214
 215                                 if(!doall && wilds && !match(tname, target_p->name))
 216                                         continue;
 217
 218                                 report_this_status(source_p, target_p);
 219                         }
 220                 }
 221
 222                 sendto_one_numeric(source_p, RPL_ENDOFTRACE,
 223                                    form_str(RPL_ENDOFTRACE), tname);
 224                 return 0;
 225         }
 226
 227         /* source_p is opered */
 228
 229         /* report all direct connections */
 230         RB_DLINK_FOREACH(ptr, lclient_list.head)
 231         {
 232                 target_p = ptr->data;
 233
 234                 /* dont show invisible users to remote opers */
 235                 if(IsInvisible(target_p) && dow && !MyConnect(source_p) && !IsOper(target_p))
 236                         continue;
 237
 238                 if(!doall && wilds && !match(tname, target_p->name))
 239                         continue;
 240
 241                 /* remote opers may not see invisible normal users */
 242                 if(dow && !MyConnect(source_p) && !IsOper(target_p) &&
 243                                 IsInvisible(target_p))
 244                         continue;
 245
 246                 cnt = report_this_status(source_p, target_p);
 247         }
 248
 249         RB_DLINK_FOREACH(ptr, serv_list.head)
 250         {
 251                 target_p = ptr->data;
 252
 253                 if(!doall && wilds && !match(tname, target_p->name))
 254                         continue;
 255
 256                 cnt = report_this_status(source_p, target_p);
 257         }
 258
 259         if(MyConnect(source_p))
 260         {
 261                 RB_DLINK_FOREACH(ptr, unknown_list.head)
 262                 {
 263                         target_p = ptr->data;
 264
 265                         if(!doall && wilds && !match(tname, target_p->name))
 266                                 continue;
 267
 268                         cnt = report_this_status(source_p, target_p);
 269                 }
 270         }
 271
 272         if(!cnt)
 273         {
 274                 sendto_one_numeric(source_p, ERR_NOSUCHSERVER, form_str(ERR_NOSUCHSERVER),
 275                                         tname);
 276
 277                 /* let the user have some idea that its at the end of the
 278                  * trace
 279                  */
 280                 sendto_one_numeric(source_p, RPL_ENDOFTRACE,
 281                                    form_str(RPL_ENDOFTRACE), tname);
 282                 return 0;
 283         }
 284
 285         if(doall)
 286         {
 287                 RB_DLINK_FOREACH(ptr, class_list.head)
 288                 {
 289                         cltmp = ptr->data;
 290
 291                         if(CurrUsers(cltmp) > 0)
 292                                 sendto_one_numeric(source_p, RPL_TRACECLASS,
 293                                                    form_str(RPL_TRACECLASS),
 294                                                    ClassName(cltmp), CurrUsers(cltmp));
 295                 }
 296         }
 297
 298         sendto_one_numeric(source_p, RPL_ENDOFTRACE, form_str(RPL_ENDOFTRACE), tname);
 299
 300         return 0;
 301 }
 302
 303 /*
 304  * count_downlinks
 305  *
 306  * inputs       - pointer to server to count
 307  *              - pointers to server and user count
 308  * output       - NONE
 309  * side effects - server and user counts are added to given values
 310  */
 311 static void
 312 count_downlinks(struct Client *server_p, int *pservcount, int *pusercount)
 313 {
 314         rb_dlink_node *ptr;
 315
 316         (*pservcount)++;
 317         *pusercount += rb_dlink_list_length(&server_p->serv->users);
 318         RB_DLINK_FOREACH(ptr, server_p->serv->servers.head)
 319         {
 320                 count_downlinks(ptr->data, pservcount, pusercount);
 321         }
 322 }
 323
 324 /*
 325  * report_this_status
 326  *
 327  * inputs       - pointer to client to report to
 328  *              - pointer to client to report about
 329  * output       - counter of number of hits
 330  * side effects - NONE
 331  */
 332 static int
 333 report_this_status(struct Client *source_p, struct Client *target_p)
 334 {
 335         const char *name;
 336         const char *class_name;
 337         char ip[HOSTIPLEN];
 338         int cnt = 0;
 339
 340         /* sanity check - should never happen */
 341         if(!MyConnect(target_p))
 342                 return 0;
 343
 344         rb_inet_ntop_sock((struct sockaddr *)&target_p->localClient->ip, ip, sizeof(ip));
 345         class_name = get_client_class(target_p);
 346
 347         if(IsAnyServer(target_p))
 348                 name = target_p->name;
 349         else
 350                 name = get_client_name(target_p, HIDE_IP);
 351
 352         switch (target_p->status)
 353         {
 354         case STAT_CONNECTING:
 355                 sendto_one_numeric(source_p, RPL_TRACECONNECTING,
 356                                 form_str(RPL_TRACECONNECTING),
 357                                 class_name, name);
 358                 cnt++;
 359                 break;
 360
 361         case STAT_HANDSHAKE:
 362                 sendto_one_numeric(source_p, RPL_TRACEHANDSHAKE,
 363                                 form_str(RPL_TRACEHANDSHAKE),
 364                                 class_name, name);
 365                 cnt++;
 366                 break;
 367
 368         case STAT_ME:
 369                 break;
 370
 371         case STAT_UNKNOWN:
 372                 /* added time -Taner */
 373                 sendto_one_numeric(source_p, RPL_TRACEUNKNOWN,
 374                                    form_str(RPL_TRACEUNKNOWN),
 375                                    class_name, name, ip,
 376                                    rb_current_time() - target_p->localClient->firsttime);
 377                 cnt++;
 378                 break;
 379
 380         case STAT_CLIENT:
 381                 {
 382                         int tnumeric;
 383
 384                         tnumeric = IsOper(target_p) ? RPL_TRACEOPERATOR : RPL_TRACEUSER;
 385                         sendto_one_numeric(source_p, tnumeric, form_str(tnumeric),
 386                                         class_name, name,
 387                                         show_ip(source_p, target_p) ? ip : empty_sockhost,
 388                                         rb_current_time() - target_p->localClient->lasttime,
 389                                         rb_current_time() - target_p->localClient->last);
 390
 391                         cnt++;
 392                 }
 393                 break;
 394
 395         case STAT_SERVER:
 396                 {
 397                         int usercount = 0;
 398                         int servcount = 0;
 399
 400                         count_downlinks(target_p, &servcount, &usercount);
 401
 402                         sendto_one_numeric(source_p, RPL_TRACESERVER, form_str(RPL_TRACESERVER),
 403                                    class_name, servcount, usercount, name,
 404                                    *(target_p->serv->by) ? target_p->serv->by : "*", "*",
 405                                    me.name, rb_current_time() - target_p->localClient->lasttime);
 406                         cnt++;
 407
 408                 }
 409                 break;
 410
 411         default:                /* ...we actually shouldn't come here... --msa */
 412                 sendto_one_numeric(source_p, RPL_TRACENEWTYPE,
 413                                    form_str(RPL_TRACENEWTYPE),
 414                                    me.name, source_p->name, name);
 415                 cnt++;
 416                 break;
 417         }
 418
 419         return (cnt);
 420 }
 421
 422 /* trace_spy()
 423  *
 424  * input        - pointer to client
 425  * output       - none
 426  * side effects - hook event doing_trace is called
 427  */
 428 static void
 429 trace_spy(struct Client *source_p, struct Client *target_p)
 430 {
 431         hook_data_client hdata;
 432
 433         hdata.client = source_p;
 434         hdata.target = target_p;
 435
 436         call_hook(doing_trace_hook, &hdata);
 437 }