nick/nick.c

   1 /* nick.c */
   2
   3 #include "nick.h"
   4 #include "../lib/flags.h"
   5 #include "../lib/irc_string.h"
   6 #include "../lib/base64.h"
   7 #include "../irc/irc.h"
   8 #include "../irc/irc_config.h"
   9 #include "../core/error.h"
  10 #include "../core/hooks.h"
  11 #include "../lib/sstring.h"
  12 #include "../server/server.h"
  13 #include "../parser/parser.h"
  14 #include "../lib/version.h"
  15 #include "../core/nsmalloc.h"
  16
  17 #include <stdlib.h>
  18 #include <string.h>
  19 #include <stdio.h>
  20
  21 MODULE_VERSION("");
  22
  23 const flag umodeflags[] = {
  24    { 'i', UMODE_INV },
  25    { 'w', UMODE_WALLOPS },
  26    { 'g', UMODE_DEBUG },
  27    { 'o', UMODE_OPER },
  28    { 'k', UMODE_SERVICE },
  29    { 'X', UMODE_XOPER },
  30    { 'd', UMODE_DEAF },
  31    { 'r', UMODE_ACCOUNT },
  32    { 'n', UMODE_HIDECHAN },
  33    { 'x', UMODE_HIDEHOST },
  34    { 'h', UMODE_SETHOST },
  35    { 'R', UMODE_REGPRIV },
  36    { 'I', UMODE_HIDEIDLE },
  37    { 'P', UMODE_PARANOID },
  38    { '\0', 0 } };
  39
  40 const flag accountflags[] = {
  41    { 'q', AFLAG_STAFF },
  42    { 'h', AFLAG_SUPPORT },
  43    { 'o', AFLAG_OPER },
  44    { 'a', AFLAG_ADMIN },
  45    { 'd', AFLAG_DEVELOPER },
  46    { '\0', 0 } };
  47
  48 #define nickhash(x)       ((crc32i(x))%NICKHASHSIZE)
  49
  50 nick *nicktable[NICKHASHSIZE];
  51 nick **servernicks[MAXSERVERS];
  52
  53 sstring *nickextnames[MAXNICKEXTS];
  54
  55 void nickstats(int hooknum, void *arg);
  56
  57 char *NULLAUTHNAME = "";
  58
  59 void _init() {
  60   unsigned int i;
  61   authname *anp;
  62
  63   /* Clear up the nicks in authext */
  64   for (i=0;i<AUTHNAMEHASHSIZE;i++)
  65     for (anp=authnametable[i];anp;anp=anp->next)
  66       anp->nicks=NULL;
  67
  68   initnickalloc();
  69   initnickhelpers();
  70   memset(nicktable,0,sizeof(nicktable));
  71   memset(servernicks,0,sizeof(servernicks));
  72
  73   /* If we're connected to IRC, force a disconnect.  This needs to be done
  74    * before we register all our hooks which would otherwise get called
  75    * during the disconnect. */
  76   if (connected) {
  77     irc_send("%s SQ %s 0 :Resync [adding nick support]",mynumeric->content,myserver->content); irc_disconnected();
  78   }
  79
  80   /* Register our hooks */
  81   registerhook(HOOK_SERVER_NEWSERVER,&handleserverchange);
  82   registerhook(HOOK_SERVER_LOSTSERVER,&handleserverchange);
  83   registerhook(HOOK_CORE_STATSREQUEST,&nickstats);
  84
  85   /* And our server handlers */
  86   registerserverhandler("N",&handlenickmsg,10);
  87   registerserverhandler("D",&handlekillmsg,2);
  88   registerserverhandler("Q",&handlequitmsg,1);
  89   registerserverhandler("M",&handleusermodemsg,3);
  90   registerserverhandler("W",&handlewhoismsg,2);
  91   registerserverhandler("AC",&handleaccountmsg,4);
  92   registerserverhandler("R",&handlestatsmsg,2);
  93   registerserverhandler("P",&handleprivmsg,2);
  94   registerserverhandler("A",&handleawaymsg,1);
  95
  96   /* Fake the addition of our own server */
  97   handleserverchange(HOOK_SERVER_NEWSERVER,(void *)numerictolong(mynumeric->content,2));
  98 }
  99
 100 void _fini() {
 101   nick *np;
 102   int i;
 103
 104   fininickhelpers();
 105
 106   for (i=0;i<NICKHASHSIZE;i++) {
 107     for (np=nicktable[i];np;np=np->next) {
 108       freesstring(np->shident);
 109       freesstring(np->sethost);
 110       freesstring(np->opername);
 111       if(!np->auth && np->authname && (np->authname != NULLAUTHNAME))
 112         free(np->authname);
 113     }
 114   }
 115
 116   nsfreeall(POOL_NICK);
 117
 118   /* Free the hooks */
 119   deregisterhook(HOOK_SERVER_NEWSERVER,&handleserverchange);
 120   deregisterhook(HOOK_SERVER_LOSTSERVER,&handleserverchange);
 121   deregisterhook(HOOK_CORE_STATSREQUEST,&nickstats);
 122
 123   /* And our server handlers */
 124   deregisterserverhandler("N",&handlenickmsg);
 125   deregisterserverhandler("D",&handlekillmsg);
 126   deregisterserverhandler("Q",&handlequitmsg);
 127   deregisterserverhandler("M",&handleusermodemsg);
 128   deregisterserverhandler("W",&handlewhoismsg);
 129   deregisterserverhandler("AC",&handleaccountmsg);
 130   deregisterserverhandler("R",&handlestatsmsg);
 131   deregisterserverhandler("P",&handleprivmsg);
 132   deregisterserverhandler("A",&handleawaymsg);
 133 }
 134
 135 /*
 136  * This function handles servers appearing and disappearing.
 137  *  For a new server, the client table is allocated.
 138  *  For a disappearing server, all it's clients are killed and the client table is freed.
 139  */
 140
 141 void handleserverchange(int hooknum, void *arg) {
 142   long servernum;
 143   int i;
 144
 145   servernum=(long)arg;
 146
 147   switch(hooknum) {
 148     case HOOK_SERVER_NEWSERVER:
 149       servernicks[servernum]=(nick **)nsmalloc(POOL_NICK,(serverlist[servernum].maxusernum+1)*sizeof(nick **));
 150       memset(servernicks[servernum],0,(serverlist[servernum].maxusernum+1)*sizeof(nick **));
 151       break;
 152
 153     case HOOK_SERVER_LOSTSERVER:
 154       for (i=0;i<=serverlist[servernum].maxusernum;i++) {
 155         if (servernicks[servernum][i]!=NULL) {
 156           deletenick(servernicks[servernum][i]);
 157         }
 158       }
 159       nsfree(POOL_NICK,servernicks[servernum]);
 160       break;
 161   }
 162 }
 163
 164 /*
 165  * deletenick:
 166  *
 167  * This function handles the removal of a nick from the network
 168  */
 169
 170 void deletenick(nick *np) {
 171   nick **nh;
 172
 173   /* Fire the hook.  This will deal with removal from channels etc. */
 174   triggerhook(HOOK_NICK_LOSTNICK, np);
 175
 176   /* Release the realname and hostname parts */
 177
 178   for (nh=&(np->realname->nicks);*nh;nh=&((*nh)->nextbyrealname)) {
 179     if (*nh==np) {
 180       *nh=np->nextbyrealname;
 181       break;
 182     }
 183   }
 184
 185   for (nh=&(np->host->nicks);*nh;nh=&((*nh)->nextbyhost)) {
 186     if (*nh==np) {
 187       *nh=np->nextbyhost;
 188       break;
 189     }
 190   }
 191
 192   releaserealname(np->realname);
 193   releasehost(np->host);
 194
 195   if(IsAccount(np)) {
 196     if(!np->auth) {
 197       if(np->authname && (np->authname != NULLAUTHNAME))
 198         free(np->authname);
 199     } else {
 200       np->auth->usercount--;
 201
 202       for (nh=&(np->auth->nicks);*nh;nh=&((*nh)->nextbyauthname)) {
 203         if (*nh==np) {
 204           *nh=np->nextbyauthname;
 205           break;
 206         }
 207       }
 208
 209       releaseauthname(np->auth);
 210     }
 211   }
 212
 213   freesstring(np->shident); /* freesstring(NULL) is OK */
 214   freesstring(np->sethost);
 215   freesstring(np->opername);
 216
 217   node_decrement_usercount(np->ipnode);
 218   derefnode(iptree, np->ipnode);
 219
 220   /* TODO: figure out how to cleanly remove nodes without affecting other modules */
 221
 222   /* Delete the nick from the servernick table */
 223   *(gethandlebynumericunsafe(np->numeric))=NULL;
 224
 225   /* Remove the nick from the hash table */
 226   removenickfromhash(np);
 227
 228   freenick(np);
 229 }
 230
 231 void addnicktohash(nick *np) {
 232   np->next=nicktable[nickhash(np->nick)];
 233   nicktable[nickhash(np->nick)]=np;
 234 }
 235
 236 void removenickfromhash(nick *np) {
 237   nick **nh;
 238
 239   for (nh=&(nicktable[nickhash(np->nick)]);*nh;nh=&((*nh)->next)) {
 240     if ((*nh)==np) {
 241       (*nh)=np->next;
 242       break;
 243     }
 244   }
 245 }
 246
 247 nick *getnickbynick(const char *name) {
 248   nick *np;
 249
 250   for (np=nicktable[nickhash(name)];np;np=np->next) {
 251     if (!ircd_strcmp(np->nick,name))
 252       return np;
 253   }
 254
 255   return NULL;
 256 }
 257
 258 void nickstats(int hooknum, void *arg) {
 259   int total,maxchain,curchain,i,buckets;
 260   nick *np;
 261   char buf[200];
 262
 263   /* Get nick stats */
 264   buckets=total=maxchain=curchain=0;
 265   for (i=0;i<NICKHASHSIZE;i++,curchain=0) {
 266     np=nicktable[i];
 267     if (np!=NULL) {
 268       buckets++;
 269       for (;np;np=np->next) {
 270         total++;
 271         curchain++;
 272       }
 273     }
 274     if (curchain>maxchain) {
 275       maxchain=curchain;
 276     }
 277   }
 278
 279   if ((long)arg>5) {
 280     /* Full stats */
 281     sprintf(buf,"Nick    : %6d nicks    (HASH: %6d/%6d, chain %3d)",total,buckets,NICKHASHSIZE,maxchain);
 282   } else if ((long)arg>2) {
 283     sprintf(buf,"Nick    : %6d users on network.",total);
 284   }
 285
 286   if ((long)arg>2) {
 287     triggerhook(HOOK_CORE_STATSREPLY,buf);
 288   }
 289 }
 290
 291 int registernickext(const char *name) {
 292   int i;
 293
 294   if (findnickext(name)!=-1) {
 295     Error("nick",ERR_WARNING,"Tried to register duplicate nick extension %s",name);
 296     return -1;
 297   }
 298
 299   for (i=0;i<MAXNICKEXTS;i++) {
 300     if (nickextnames[i]==NULL) {
 301       nickextnames[i]=getsstring(name,100);
 302       return i;
 303     }
 304   }
 305
 306   Error("nick",ERR_WARNING,"Tried to register too many nick extensions: %s",name);
 307   return -1;
 308 }
 309
 310 int findnickext(const char *name) {
 311   int i;
 312
 313   for (i=0;i<MAXNICKEXTS;i++) {
 314     if (nickextnames[i]!=NULL && !ircd_strcmp(name,nickextnames[i]->content)) {
 315       return i;
 316     }
 317   }
 318
 319   return -1;
 320 }
 321
 322 void releasenickext(int index) {
 323   int i;
 324   nick *np;
 325
 326   freesstring(nickextnames[index]);
 327   nickextnames[index]=NULL;
 328
 329   for (i=0;i<NICKHASHSIZE;i++) {
 330     for (np=nicktable[i];np;np=np->next) {
 331       np->exts[index]=NULL;
 332     }
 333   }
 334 }
 335
 336 /* visiblehostmask
 337  *  Produces the "apparent" hostmask as seen by network users.
 338  */
 339
 340 char *visiblehostmask(nick *np, char *buf) {
 341   char uhbuf[USERLEN+HOSTLEN+2];
 342
 343   visibleuserhost(np, uhbuf);
 344   sprintf(buf,"%s!%s",np->nick,uhbuf);
 345
 346   return buf;
 347 }
 348
 349 /* visibleuserhost
 350  *  As above without nick
 351  */
 352
 353 char *visibleuserhost(nick *np, char *buf) {
 354   char hostbuf[HOSTLEN+1];
 355   char *ident, *host;
 356
 357   ident=np->ident;
 358   host=np->host->name->content;
 359
 360   if (IsSetHost(np)) {
 361     if (np->shident) {
 362       ident=np->shident->content;
 363     }
 364     if (np->sethost) {
 365       host=np->sethost->content;
 366     }
 367   } else if (IsAccount(np) && IsHideHost(np)) {
 368     sprintf(hostbuf,"%s.%s", np->authname, HIS_HIDDENHOST);
 369     host=hostbuf;
 370   }
 371
 372   sprintf(buf,"%s@%s",ident,host);
 373
 374   return buf;
 375 }
 376
 377 #if 0
 378
 379 /*
 380  * gethandlebynumeric:
 381  *  Given a numeric, gives the location in the servernicks table
 382  *  where it should be.  Does not check that the nick currently found
 383  *  there (if any) has the correct numeric; this is left to the
 384  *  calling function to figure out.
 385  */
 386
 387 nick **gethandlebynumeric(long numeric) {
 388   int servernum;
 389   int maskednum;
 390   server *serv;
 391
 392   /* Shift off the client identifier part of the numeric to get the server ID */
 393   servernum=(numeric>>18);
 394
 395   if ((serv=getserverdata(servernum))==NULL) {
 396     Error("nick",ERR_WARNING,"Numeric %ld refers to non-existent server %d",numeric,servernum);
 397     return NULL;
 398   }
 399
 400   /* Compute the masked numeric */
 401   maskednum=numeric&(serv->maxusernum);
 402
 403   return (servernicks[servernum])+maskednum;
 404 }
 405
 406 /*
 407  * getnickbynumeric[str]()
 408  *  These functions retrieve a nick based on it's numeric on the network
 409  *  Use the approriate function depending on how your numeric is expressed..
 410  */
 411
 412 nick *getnickbynumeric(long numeric) {
 413   nick **nh;
 414
 415   nh=gethandlebynumeric(numeric);
 416
 417   if ((*nh) && ((*nh)->numeric!=numeric)) {
 418     /* We found a masked numeric match, but the actual numeric
 419      * is different.  This counts as a miss. */
 420     return NULL;
 421   }
 422
 423   return (*nh);
 424 }
 425
 426 nick *getnickbynumericstr(char *numericstr) {
 427   return getnickbynumeric(numerictolong(numericstr,5));
 428 }
 429
 430 #endif
 431