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1 /*       +------------------------------------+
2  *       | Inspire Internet Relay Chat Daemon |
3  *       +------------------------------------+
4  *
5  *  Inspire is copyright (C) 2002-2005 ChatSpike-Dev.
6  *                       E-mail:
7  *                <brain@chatspike.net>
8  *                <Craig@chatspike.net>
9  *
10  * Written by Craig Edwards, Craig McLure, and others.
11  * This program is free but copyrighted software; see
12  *            the file COPYING for details.
13  *
14  * ---------------------------------------------------
15  */
16
17 using namespace std;
18
19 #include "inspircd_config.h"
20 #include "inspircd.h"
21 #include "inspircd_io.h"
22 #include <unistd.h>
23 #include <fcntl.h>
24 #include <sys/errno.h>
25 #include <sys/ioctl.h>
26 #include <sys/utsname.h>
27 #include <time.h>
28 #include <string>
29 #ifdef GCC3
30 #include <ext/hash_map>
31 #else
32 #include <hash_map>
33 #endif
34 #include <map>
35 #include <sstream>
36 #include <vector>
37 #include <deque>
38 #include <sched.h>
39 #ifdef THREADED_DNS
40 #include <pthread.h>
41 #endif
42 #include "users.h"
43 #include "globals.h"
44 #include "modules.h"
45 #include "dynamic.h"
46 #include "wildcard.h"
47 #include "message.h"
48 #include "mode.h"
49 #include "commands.h"
50 #include "xline.h"
51 #include "inspstring.h"
52 #include "dnsqueue.h"
53 #include "helperfuncs.h"
54 #include "hashcomp.h"
55 #include "socketengine.h"
56 #include "userprocess.h"
57 #include "socket.h"
58 #include "dns.h"
59 #include "typedefs.h"
60 #include "command_parse.h"
61 #include "ctables.h"
62
63 extern InspIRCd* ServerInstance;
64
65 extern std::vector<Module*> modules;
66 extern std::vector<ircd_module*> factory;
67 extern std::vector<InspSocket*> module_sockets;
68 extern std::vector<userrec*> local_users;
69
70 extern int MODCOUNT;
71 extern InspSocket* socket_ref[65535];
72 extern time_t TIME;
73
74 extern SocketEngine* SE;
75
76 // This table references users by file descriptor.
77 // its an array to make it VERY fast, as all lookups are referenced
78 // by an integer, meaning there is no need for a scan/search operation.
79 extern userrec* fd_ref_table[65536];
80
81 extern Server* MyServer;
82 extern ServerConfig *Config;
83
84 extern user_hash clientlist;
85 extern chan_hash chanlist;
86
87 /* This function pokes and hacks at a parameter list like the following:
88  *
89  * PART #winbot,#darkgalaxy :m00!
90  *
91  * to turn it into a series of individual calls like this:
92  *
93  * PART #winbot :m00!
94  * PART #darkgalaxy :m00!
95  *
96  * The seperate calls are sent to a callback function provided by the caller
97  * (the caller will usually call itself recursively). The callback function
98  * must be a command handler. Calling this function on a line with no list causes
99  * no action to be taken. You must provide a starting and ending parameter number
100  * where the range of the list can be found, useful if you have a terminating
101  * parameter as above which is actually not part of the list, or parameters
102  * before the actual list as well. This code is used by many functions which
103  * can function as "one to list" (see the RFC) */
104
105 int CommandParser::LoopCall(command_t* fn, char **parameters, int pcnt, userrec *u, int start, int end, int joins)
106 {
107         char plist[MAXBUF];
108         char *param;
109         char *pars[32];
110         char blog[32][MAXBUF];
111         char blog2[32][MAXBUF];
112         int j = 0, q = 0, total = 0, t = 0, t2 = 0, total2 = 0;
113         char keystr[MAXBUF];
114         char moo[MAXBUF];
115
116         for (int i = 0; i <32; i++)
117                 *blog[i] = 0;
118
119         for (int i = 0; i <32; i++)
120                 *blog2[i] = 0;
121
122         *moo = 0;
123         for (int i = 0; i <10; i++)
124         {
125                 if (!parameters[i])
126                 {
127                         parameters[i] = moo;
128                 }
129         }
130         if (joins)
131         {
132                 if (pcnt > 1) /* we have a key to copy */
133                 {
134                         strlcpy(keystr,parameters[1],MAXBUF);
135                 }
136         }
137
138         if (!parameters[start])
139         {
140                 return 0;
141         }
142         if (!strchr(parameters[start],','))
143         {
144                 return 0;
145         }
146         *plist = 0;
147         for (int i = start; i <= end; i++)
148         {
149                 if (parameters[i])
150                 {
151                         strlcat(plist,parameters[i],MAXBUF);
152                 }
153         }
154
155         j = 0;
156         param = plist;
157
158         t = strlen(plist);
159         for (int i = 0; i < t; i++)
160         {
161                 if (plist[i] == ',')
162                 {
163                         plist[i] = '\0';
164                         strlcpy(blog[j++],param,MAXBUF);
165                         param = plist+i+1;
166                         if (j>20)
167                         {
168                                 WriteServ(u->fd,"407 %s %s :Too many targets in list, message not delivered.",u->nick,blog[j-1]);
169                                 return 1;
170                         }
171                 }
172         }
173         strlcpy(blog[j++],param,MAXBUF);
174         total = j;
175
176         if ((joins) && (keystr) && (total>0)) // more than one channel and is joining
177         {
178                 strcat(keystr,",");
179         }
180
181         if ((joins) && (keystr))
182         {
183                 if (strchr(keystr,','))
184                 {
185                         j = 0;
186                         param = keystr;
187                         t2 = strlen(keystr);
188                         for (int i = 0; i < t2; i++)
189                         {
190                                 if (keystr[i] == ',')
191                                 {
192                                         keystr[i] = '\0';
193                                         strlcpy(blog2[j++],param,MAXBUF);
194                                         param = keystr+i+1;
195                                 }
196                         }
197                         strlcpy(blog2[j++],param,MAXBUF);
198                         total2 = j;
199                 }
200         }
201
202         for (j = 0; j < total; j++)
203         {
204                 if (blog[j])
205                 {
206                         pars[0] = blog[j];
207                 }
208                 for (q = end; q < pcnt-1; q++)
209                 {
210                         if (parameters[q+1])
211                         {
212                                 pars[q-end+1] = parameters[q+1];
213                         }
214                 }
215                 if ((joins) && (parameters[1]))
216                 {
217                         if (pcnt > 1)
218                         {
219                                 pars[1] = blog2[j];
220                         }
221                         else
222                         {
223                                 pars[1] = NULL;
224                         }
225                 }
226                 /* repeatedly call the function with the hacked parameter list */
227                 if ((joins) && (pcnt > 1))
228                 {
229                         if (pars[1])
230                         {
231                                 // pars[1] already set up and containing key from blog2[j]
232                                 fn->Handle(pars,2,u);
233                         }
234                         else
235                         {
236                                 pars[1] = parameters[1];
237                                 fn->Handle(pars,2,u);
238                         }
239                 }
240                 else
241                 {
242                         fn->Handle(pars,pcnt-(end-start),u);
243                 }
244         }
245
246         return 1;
247 }
248
249 bool CommandParser::IsValidCommand(std::string &commandname, int pcnt, userrec * user)
250 {
251         for (unsigned int i = 0; i < cmdlist.size(); i++)
252         {
253                 if (cmdlist[i]->command == commandname)
254                 {
255                         if ((pcnt>=cmdlist[i]->min_params) && (cmdlist[i]->source != "<core>"))
256                         {
257                                 if ((strchr(user->modes,cmdlist[i]->flags_needed)) || (!cmdlist[i]->flags_needed))
258                                 {
259                                         if (cmdlist[i]->flags_needed)
260                                         {
261                                                 if ((user->HasPermission(commandname)) || (is_uline(user->server)))
262                                                 {
263                                                         return true;
264                                                 }
265                                                 else
266                                                 {
267                                                         return false;
268                                                 }
269                                         }
270                                         return true;
271                                 }
272                         }
273                 }
274         }
275         return false;
276 }
277
278 // calls a handler function for a command
279
280 void CommandParser::CallHandler(std::string &commandname,char **parameters, int pcnt, userrec *user)
281 {
282         for (unsigned int i = 0; i < cmdlist.size(); i++)
283         {
284                 if (cmdlist[i]->command == commandname)
285                 {
286                         if (pcnt>=cmdlist[i]->min_params)
287                         {
288                                 if ((strchr(user->modes,cmdlist[i]->flags_needed)) || (!cmdlist[i]->flags_needed))
289                                 {
290                                         if (cmdlist[i]->flags_needed)
291                                         {
292                                                 if ((user->HasPermission(commandname)) || (is_uline(user->server)))
293                                                 {
294                                                         cmdlist[i]->Handle(parameters,pcnt,user);
295                                                 }
296                                         }
297                                         else
298                                         {
299                                                 cmdlist[i]->Handle(parameters,pcnt,user);
300                                         }
301                                 }
302                         }
303                 }
304         }
305 }
306
307 int CommandParser::ProcessParameters(char **command_p,char *parameters)
308 {
309         int j = 0;
310         int q = strlen(parameters);
311         if (!q)
312         {
313                 /* no parameters, command_p invalid! */
314                 return 0;
315         }
316         if (parameters[0] == ':')
317         {
318                 command_p[0] = parameters+1;
319                 return 1;
320         }
321         if (q)
322         {
323                 if ((strchr(parameters,' ')==NULL) || (parameters[0] == ':'))
324                 {
325                         /* only one parameter */
326                         command_p[0] = parameters;
327                         if (parameters[0] == ':')
328                         {
329                                 if (strchr(parameters,' ') != NULL)
330                                 {
331                                         command_p[0]++;
332                                 }
333                         }
334                         return 1;
335                 }
336         }
337         command_p[j++] = parameters;
338         for (int i = 0; i <= q; i++)
339         {
340                 if (parameters[i] == ' ')
341                 {
342                         command_p[j++] = parameters+i+1;
343                         parameters[i] = '\0';
344                         if (command_p[j-1][0] == ':')
345                         {
346                                 *command_p[j-1]++; /* remove dodgy ":" */
347                                 break;
348                                 /* parameter like this marks end of the sequence */
349                         }
350                 }
351         }
352         return j; /* returns total number of items in the list */
353 }
354
355 void CommandParser::ProcessCommand(userrec *user, char* cmd)
356 {
357         char *parameters;
358         char *command;
359         char *command_p[127];
360         char p[MAXBUF], temp[MAXBUF];
361         int j, items, cmd_found;
362
363         for (int i = 0; i < 127; i++)
364                 command_p[i] = NULL;
365
366         if (!user)
367         {
368                 return;
369         }
370         if (!cmd)
371         {
372                 return;
373         }
374         if (!cmd[0])
375         {
376                 return;
377         }
378
379         int total_params = 0;
380         unsigned int xl = strlen(cmd);
381         if (xl > 2)
382         {
383                 for (unsigned int q = 0; q < xl - 1; q++)
384                 {
385                         if ((cmd[q] == ' ') && (cmd[q+1] == ':'))
386                         {
387                                 total_params++;
388                                 // found a 'trailing', we dont count them after this.
389                                 break;
390                         }
391                         if (cmd[q] == ' ')
392                                 total_params++;
393                 }
394         }
395
396         // another phidjit bug...
397         if (total_params > 126)
398         {
399                 *(strchr(cmd,' ')) = '\0';
400                 WriteServ(user->fd,"421 %s %s :Too many parameters given",user->nick,cmd);
401                 return;
402         }
403
404         strlcpy(temp,cmd,MAXBUF);
405
406         std::string tmp = cmd;
407         for (int i = 0; i <= MODCOUNT; i++)
408         {
409                 std::string oldtmp = tmp;
410                 modules[i]->OnServerRaw(tmp,true,user);
411                 if (oldtmp != tmp)
412                 {
413                         log(DEBUG,"A Module changed the input string!");
414                         log(DEBUG,"New string: %s",tmp.c_str());
415                         log(DEBUG,"Old string: %s",oldtmp.c_str());
416                         break;
417                 }
418         }
419         strlcpy(cmd,tmp.c_str(),MAXBUF);
420         strlcpy(temp,cmd,MAXBUF);
421
422         if (!strchr(cmd,' '))
423         {
424                 /* no parameters, lets skip the formalities and not chop up
425                  * the string */
426                 log(DEBUG,"About to preprocess command with no params");
427                 items = 0;
428                 command_p[0] = NULL;
429                 parameters = NULL;
430                 unsigned int tl = strlen(cmd);
431                 for (unsigned int i = 0; i <= tl; i++)
432                 {
433                         cmd[i] = toupper(cmd[i]);
434                 }
435                 command = cmd;
436         }
437         else
438         {
439                 *cmd = 0;
440                 j = 0;
441
442                 unsigned int vl = strlen(temp);
443                 /* strip out extraneous linefeeds through mirc's crappy pasting (thanks Craig) */
444                 for (unsigned int i = 0; i < vl; i++)
445                 {
446                         if ((temp[i] != 10) && (temp[i] != 13) && (temp[i] != 0) && (temp[i] != 7))
447                         {
448                                 cmd[j++] = temp[i];
449                                 cmd[j] = 0;
450                         }
451                 }
452                 /* split the full string into a command plus parameters */
453                 parameters = p;
454                 p[0] = ' ';
455                 p[1] = 0;
456                 
457                 command = cmd;
458                 if (strchr(cmd,' '))
459                 {
460                         unsigned int cl = strlen(cmd);
461                         for (unsigned int i = 0; i <= cl; i++)
462                         {
463                                 /* capitalise the command ONLY, leave params intact */
464                                 cmd[i] = toupper(cmd[i]);
465                                 /* are we nearly there yet?! :P */
466                                 if (cmd[i] == ' ')
467                                 {
468                                         command = cmd;
469                                         parameters = cmd+i+1;
470                                         cmd[i] = '\0';
471                                         break;
472                                 }
473                         }
474                 }
475                 else
476                 {
477                         for (unsigned int i = 0; i <= strlen(cmd); i++)
478                         {
479                                 cmd[i] = toupper(cmd[i]);
480                         }
481                 }
482
483         }
484         cmd_found = 0;
485
486         if (strlen(command)>MAXCOMMAND)
487         {
488                 WriteServ(user->fd,"421 %s %s :Command too long",user->nick,command);
489                 return;
490         }
491
492         for (char* x = command; *x; x++)
493         {
494                 if (((*x < 'A') || (*x > 'Z')) && (*x != '.'))
495                 {
496                         if (((*x < '0') || (*x> '9')) && (*x != '-'))
497                         {
498                                 if (strchr("@!\"$%^&*(){}[]_=+;:'#~,<>/?\\|`",*x))
499                                 {
500                                         ServerInstance->stats->statsUnknown++;
501                                         WriteServ(user->fd,"421 %s %s :Unknown command",user->nick,command);
502                                         return;
503                                 }
504                         }
505                 }
506         }
507
508         std::string xcommand = command;
509         
510         /* Tweak by brain - why was this INSIDE the mainloop? */
511         if (parameters)
512         {
513                  if (parameters[0])
514                  {
515                          items = this->ProcessParameters(command_p,parameters);
516                  }
517                  else
518                  {
519                          items = 0;
520                          command_p[0] = NULL;
521                  }
522         }
523         else
524         {
525                 items = 0;
526                 command_p[0] = NULL;
527         }
528
529         int MOD_RESULT = 0;
530         FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,false));
531         if (MOD_RESULT == 1) {
532                 return;
533         }
534         
535         for (unsigned int i = 0; i != cmdlist.size(); i++)
536         {
537                         if ((xcommand.length() >= cmdlist[i]->command.length()) && (xcommand == cmdlist[i]->command))
538                         {
539                                 if (user)
540                                 {
541                                         /* activity resets the ping pending timer */
542                                         user->nping = TIME + user->pingmax;
543                                         if ((items) < cmdlist[i]->min_params)
544                                         {
545                                                 log(DEBUG,"not enough parameters: %s %s",user->nick,command);
546                                                 WriteServ(user->fd,"461 %s %s :Not enough parameters",user->nick,command);
547                                                 return;
548                                         }
549                                         if ((!strchr(user->modes,cmdlist[i]->flags_needed)) && (cmdlist[i]->flags_needed))
550                                         {
551                                                 log(DEBUG,"permission denied: %s %s",user->nick,command);
552                                                 WriteServ(user->fd,"481 %s :Permission Denied- You do not have the required operator privilages",user->nick);
553                                                 cmd_found = 1;
554                                                 return;
555                                         }
556                                         if ((cmdlist[i]->flags_needed) && (!user->HasPermission(xcommand)))
557                                         {
558                                                 log(DEBUG,"permission denied: %s %s",user->nick,command);
559                                                 WriteServ(user->fd,"481 %s :Permission Denied- Oper type %s does not have access to command %s",user->nick,user->oper,command);
560                                                 cmd_found = 1;
561                                                 return;
562                                         }
563                                         /* if the command isnt USER, PASS, or NICK, and nick is empty,
564                                          * deny command! */
565                                         if ((strncmp(command,"USER",4)) && (strncmp(command,"NICK",4)) && (strncmp(command,"PASS",4)))
566                                         {
567                                                 if ((!isnick(user->nick)) || (user->registered != 7))
568                                                 {
569                                                         log(DEBUG,"not registered: %s %s",user->nick,command);
570                                                         WriteServ(user->fd,"451 %s :You have not registered",command);
571                                                         return;
572                                                 }
573                                         }
574                                         if ((user->registered == 7) && (!strchr(user->modes,'o')))
575                                         {
576                                                 std::stringstream dcmds(Config->DisabledCommands);
577                                                 while (!dcmds.eof())
578                                                 {
579                                                         std::string thiscmd;
580                                                         dcmds >> thiscmd;
581                                                         if (!strcasecmp(thiscmd.c_str(),command))
582                                                         {
583                                                                 // command is disabled!
584                                                                 WriteServ(user->fd,"421 %s %s :This command has been disabled.",user->nick,command);
585                                                                 return;
586                                                         }
587                                                 }
588                                         }
589                                         if ((user->registered == 7) || (!strncmp(command,"USER",4)) || (!strncmp(command,"NICK",4)) || (!strncmp(command,"PASS",4)))
590                                         {
591                                                         /* ikky /stats counters */
592                                                         if (temp)
593                                                         {
594                                                                 cmdlist[i]->use_count++;
595                                                                 cmdlist[i]->total_bytes+=strlen(temp);
596                                                         }
597
598                                                         int MOD_RESULT = 0;
599                                                         FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,true));
600                                                         if (MOD_RESULT == 1) {
601                                                                 return;
602                                                         }
603
604                                                         /* WARNING: nothing may come after the
605                                                          * command handler call, as the handler
606                                                          * may free the user structure! */
607
608                                                         cmdlist[i]->Handle(command_p,items,user);
609                                                 return;
610                                         }
611                                         else
612                                         {
613                                                 WriteServ(user->fd,"451 %s :You have not registered",command);
614                                                 return;
615                                         }
616                                 }
617                                 cmd_found = 1;
618                         }
619         }
620         if ((!cmd_found) && (user))
621         {
622                 ServerInstance->stats->statsUnknown++;
623                 WriteServ(user->fd,"421 %s %s :Unknown command",user->nick,command);
624         }
625 }
626
627 bool CommandParser::RemoveCommands(const char* source)
628 {
629         bool go_again = true;
630         while (go_again)
631         {
632                 go_again = false;
633                 for (std::deque<command_t*>::iterator i = cmdlist.begin(); i != cmdlist.end(); i++)
634                 {
635                         command_t* x = (command_t*)*i;
636                         if (x->source == std::string(source))
637                         {
638                                 log(DEBUG,"removecommands(%s) Removing dependent command: %s",x->source.c_str(),x->command.c_str());
639                                 cmdlist.erase(i);
640                                 go_again = true;
641                                 break;
642                         }
643                 }
644         }
645         return true;
646 }
647
648 void CommandParser::ProcessBuffer(const char* cmdbuf,userrec *user)
649 {
650         if (!user)
651         {
652                 log(DEFAULT,"*** BUG *** process_buffer was given an invalid parameter");
653                 return;
654         }
655         char cmd[MAXBUF];
656         if (!cmdbuf)
657         {
658                 log(DEFAULT,"*** BUG *** process_buffer was given an invalid parameter");
659                 return;
660         }
661         if (!cmdbuf[0])
662         {
663                 return;
664         }
665         while (*cmdbuf == ' ') cmdbuf++; // strip leading spaces
666
667         strlcpy(cmd,cmdbuf,MAXBUF);
668         if (!cmd[0])
669         {
670                 return;
671         }
672         int sl = strlen(cmd)-1;
673         if ((cmd[sl] == 13) || (cmd[sl] == 10))
674         {
675                 cmd[sl] = '\0';
676         }
677         sl = strlen(cmd)-1;
678         if ((cmd[sl] == 13) || (cmd[sl] == 10))
679         {
680                 cmd[sl] = '\0';
681         }
682         sl = strlen(cmd)-1;
683         while (cmd[sl] == ' ') // strip trailing spaces
684         {
685                 cmd[sl] = '\0';
686                 sl = strlen(cmd)-1;
687         }
688
689         if (!cmd[0])
690         {
691                 return;
692         }
693         log(DEBUG,"CMDIN: %s %s",user->nick,cmd);
694         tidystring(cmd);
695         if ((user) && (cmd))
696         {
697                 this->ProcessCommand(user,cmd);
698         }
699 }
700
701 bool CommandParser::CreateCommand(command_t *f)
702 {
703         /* create the command and push it onto the table */
704         cmdlist.push_back(f);
705         log(DEBUG,"Added command %s (%lu parameters)",f->command.c_str(),(unsigned long)f->min_params);
706         return true;
707 }
708
709 CommandParser::CommandParser()
710 {
711         this->SetupCommandTable();
712 }
713
714 void CommandParser::SetupCommandTable()
715 {
716         this->CreateCommand(new cmd_user);
717         this->CreateCommand(new cmd_nick);
718         this->CreateCommand(new cmd_quit);
719         this->CreateCommand(new cmd_version);
720         this->CreateCommand(new cmd_ping);
721         this->CreateCommand(new cmd_pong);
722         this->CreateCommand(new cmd_admin);
723         this->CreateCommand(new cmd_privmsg);
724         this->CreateCommand(new cmd_info);
725         this->CreateCommand(new cmd_time);
726         this->CreateCommand(new cmd_whois);
727         this->CreateCommand(new cmd_wallops);
728         this->CreateCommand(new cmd_notice);
729         this->CreateCommand(new cmd_join);
730         this->CreateCommand(new cmd_names);
731         this->CreateCommand(new cmd_part);
732         this->CreateCommand(new cmd_kick);
733         this->CreateCommand(new cmd_mode);
734         this->CreateCommand(new cmd_topic);
735         this->CreateCommand(new cmd_who);
736         this->CreateCommand(new cmd_motd);
737         this->CreateCommand(new cmd_rules);
738         this->CreateCommand(new cmd_oper);
739         this->CreateCommand(new cmd_list);
740         this->CreateCommand(new cmd_die);
741         this->CreateCommand(new cmd_restart);
742         this->CreateCommand(new cmd_kill);
743         this->CreateCommand(new cmd_rehash);
744         this->CreateCommand(new cmd_lusers);
745         this->CreateCommand(new cmd_stats);
746         this->CreateCommand(new cmd_userhost);
747         this->CreateCommand(new cmd_away);
748         this->CreateCommand(new cmd_ison);
749         this->CreateCommand(new cmd_summon);
750         this->CreateCommand(new cmd_users);
751         this->CreateCommand(new cmd_invite);
752         this->CreateCommand(new cmd_pass);
753         this->CreateCommand(new cmd_trace);
754         this->CreateCommand(new cmd_whowas);
755         this->CreateCommand(new cmd_connect);
756         this->CreateCommand(new cmd_squit);
757         this->CreateCommand(new cmd_modules);
758         this->CreateCommand(new cmd_links);
759         this->CreateCommand(new cmd_map);
760         this->CreateCommand(new cmd_kline);
761         this->CreateCommand(new cmd_gline);
762         this->CreateCommand(new cmd_zline);
763         this->CreateCommand(new cmd_qline);
764         this->CreateCommand(new cmd_eline);
765         this->CreateCommand(new cmd_loadmodule);
766         this->CreateCommand(new cmd_unloadmodule);
767         this->CreateCommand(new cmd_server);
768         this->CreateCommand(new cmd_commands);
769 }
770