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
  95   /* Fake the addition of our own server */
  96   handleserverchange(HOOK_SERVER_NEWSERVER,(void *)numerictolong(mynumeric->content,2));
  97 }
  98
  99 void _fini() {
 100   nick *np;
 101   int i;
 102
 103   fininickhelpers();
 104
 105   for (i=0;i<NICKHASHSIZE;i++) {
 106     for (np=nicktable[i];np;np=np->next) {
 107       freesstring(np->shident);
 108       freesstring(np->sethost);
 109       freesstring(np->opername);
 110       if(!np->auth && np->authname && (np->authname != NULLAUTHNAME))
 111         free(np->authname);
 112     }
 113   }
 114
 115   nsfreeall(POOL_NICK);
 116
 117   /* Free the hooks */
 118   deregisterhook(HOOK_SERVER_NEWSERVER,&handleserverchange);
 119   deregisterhook(HOOK_SERVER_LOSTSERVER,&handleserverchange);
 120   deregisterhook(HOOK_CORE_STATSREQUEST,&nickstats);
 121
 122   /* And our server handlers */
 123   deregisterserverhandler("N",&handlenickmsg);
 124   deregisterserverhandler("D",&handlekillmsg);
 125   deregisterserverhandler("Q",&handlequitmsg);
 126   deregisterserverhandler("M",&handleusermodemsg);
 127   deregisterserverhandler("W",&handlewhoismsg);
 128   deregisterserverhandler("AC",&handleaccountmsg);
 129   deregisterserverhandler("R",&handlestatsmsg);
 130   deregisterserverhandler("P",&handleprivmsg);
 131 }
 132
 133 /*
 134  * This function handles servers appearing and disappearing.
 135  *  For a new server, the client table is allocated.
 136  *  For a disappearing server, all it's clients are killed and the client table is freed.
 137  */
 138
 139 void handleserverchange(int hooknum, void *arg) {
 140   long servernum;
 141   int i;
 142
 143   servernum=(long)arg;
 144
 145   switch(hooknum) {
 146     case HOOK_SERVER_NEWSERVER:
 147       servernicks[servernum]=(nick **)nsmalloc(POOL_NICK,(serverlist[servernum].maxusernum+1)*sizeof(nick **));
 148       memset(servernicks[servernum],0,(serverlist[servernum].maxusernum+1)*sizeof(nick **));
 149       break;
 150
 151     case HOOK_SERVER_LOSTSERVER:
 152       for (i=0;i<=serverlist[servernum].maxusernum;i++) {
 153         if (servernicks[servernum][i]!=NULL) {
 154           deletenick(servernicks[servernum][i]);
 155         }
 156       }
 157       nsfree(POOL_NICK,servernicks[servernum]);
 158       break;
 159   }
 160 }
 161
 162 /*
 163  * deletenick:
 164  *
 165  * This function handles the removal of a nick from the network
 166  */
 167
 168 void deletenick(nick *np) {
 169   nick **nh;
 170
 171   /* Fire the hook.  This will deal with removal from channels etc. */
 172   triggerhook(HOOK_NICK_LOSTNICK, np);
 173
 174   /* Release the realname and hostname parts */
 175
 176   for (nh=&(np->realname->nicks);*nh;nh=&((*nh)->nextbyrealname)) {
 177     if (*nh==np) {
 178       *nh=np->nextbyrealname;
 179       break;
 180     }
 181   }
 182
 183   for (nh=&(np->host->nicks);*nh;nh=&((*nh)->nextbyhost)) {
 184     if (*nh==np) {
 185       *nh=np->nextbyhost;
 186       break;
 187     }
 188   }
 189
 190   releaserealname(np->realname);
 191   releasehost(np->host);
 192
 193   if(IsAccount(np)) {
 194     if(!np->auth) {
 195       if(np->authname && (np->authname != NULLAUTHNAME))
 196         free(np->authname);
 197     } else {
 198       np->auth->usercount--;
 199
 200       for (nh=&(np->auth->nicks);*nh;nh=&((*nh)->nextbyauthname)) {
 201         if (*nh==np) {
 202           *nh=np->nextbyauthname;
 203           break;
 204         }
 205       }
 206
 207       releaseauthname(np->auth);
 208     }
 209   }
 210
 211   freesstring(np->shident); /* freesstring(NULL) is OK */
 212   freesstring(np->sethost);
 213   freesstring(np->opername);
 214
 215   node_decrement_usercount(np->ipnode);
 216   derefnode(iptree, np->ipnode);
 217
 218   /* TODO: figure out how to cleanly remove nodes without affecting other modules */
 219
 220   /* Delete the nick from the servernick table */
 221   *(gethandlebynumericunsafe(np->numeric))=NULL;
 222
 223   /* Remove the nick from the hash table */
 224   removenickfromhash(np);
 225
 226   freenick(np);
 227 }
 228
 229 void addnicktohash(nick *np) {
 230   np->next=nicktable[nickhash(np->nick)];
 231   nicktable[nickhash(np->nick)]=np;
 232 }
 233
 234 void removenickfromhash(nick *np) {
 235   nick **nh;
 236
 237   for (nh=&(nicktable[nickhash(np->nick)]);*nh;nh=&((*nh)->next)) {
 238     if ((*nh)==np) {
 239       (*nh)=np->next;
 240       break;
 241     }
 242   }
 243 }
 244
 245 nick *getnickbynick(const char *name) {
 246   nick *np;
 247
 248   for (np=nicktable[nickhash(name)];np;np=np->next) {
 249     if (!ircd_strcmp(np->nick,name))
 250       return np;
 251   }
 252
 253   return NULL;
 254 }
 255
 256 void nickstats(int hooknum, void *arg) {
 257   int total,maxchain,curchain,i,buckets;
 258   nick *np;
 259   char buf[200];
 260
 261   /* Get nick stats */
 262   buckets=total=maxchain=curchain=0;
 263   for (i=0;i<NICKHASHSIZE;i++,curchain=0) {
 264     np=nicktable[i];
 265     if (np!=NULL) {
 266       buckets++;
 267       for (;np;np=np->next) {
 268         total++;
 269         curchain++;
 270       }
 271     }
 272     if (curchain>maxchain) {
 273       maxchain=curchain;
 274     }
 275   }
 276
 277   if ((long)arg>5) {
 278     /* Full stats */
 279     sprintf(buf,"Nick    : %6d nicks    (HASH: %6d/%6d, chain %3d)",total,buckets,NICKHASHSIZE,maxchain);
 280   } else if ((long)arg>2) {
 281     sprintf(buf,"Nick    : %6d users on network.",total);
 282   }
 283
 284   if ((long)arg>2) {
 285     triggerhook(HOOK_CORE_STATSREPLY,buf);
 286   }
 287 }
 288
 289 int registernickext(const char *name) {
 290   int i;
 291
 292   if (findnickext(name)!=-1) {
 293     Error("nick",ERR_WARNING,"Tried to register duplicate nick extension %s",name);
 294     return -1;
 295   }
 296
 297   for (i=0;i<MAXNICKEXTS;i++) {
 298     if (nickextnames[i]==NULL) {
 299       nickextnames[i]=getsstring(name,100);
 300       return i;
 301     }
 302   }
 303
 304   Error("nick",ERR_WARNING,"Tried to register too many nick extensions: %s",name);
 305   return -1;
 306 }
 307
 308 int findnickext(const char *name) {
 309   int i;
 310
 311   for (i=0;i<MAXNICKEXTS;i++) {
 312     if (nickextnames[i]!=NULL && !ircd_strcmp(name,nickextnames[i]->content)) {
 313       return i;
 314     }
 315   }
 316
 317   return -1;
 318 }
 319
 320 void releasenickext(int index) {
 321   int i;
 322   nick *np;
 323
 324   freesstring(nickextnames[index]);
 325   nickextnames[index]=NULL;
 326
 327   for (i=0;i<NICKHASHSIZE;i++) {
 328     for (np=nicktable[i];np;np=np->next) {
 329       np->exts[index]=NULL;
 330     }
 331   }
 332 }
 333
 334 /* visiblehostmask
 335  *  Produces the "apparent" hostmask as seen by network users.
 336  */
 337
 338 char *visiblehostmask(nick *np, char *buf) {
 339   char uhbuf[USERLEN+HOSTLEN+2];
 340
 341   visibleuserhost(np, uhbuf);
 342   sprintf(buf,"%s!%s",np->nick,uhbuf);
 343
 344   return buf;
 345 }
 346
 347 /* visibleuserhost
 348  *  As above without nick
 349  */
 350
 351 char *visibleuserhost(nick *np, char *buf) {
 352   char hostbuf[HOSTLEN+1];
 353   char *ident, *host;
 354
 355   ident=np->ident;
 356   host=np->host->name->content;
 357
 358   if (IsSetHost(np)) {
 359     if (np->shident) {
 360       ident=np->shident->content;
 361     }
 362     if (np->sethost) {
 363       host=np->sethost->content;
 364     }
 365   } else if (IsAccount(np) && IsHideHost(np)) {
 366     sprintf(hostbuf,"%s.%s", np->authname, HIS_HIDDENHOST);
 367     host=hostbuf;
 368   }
 369
 370   sprintf(buf,"%s@%s",ident,host);
 371
 372   return buf;
 373 }
 374
 375 #if 0
 376
 377 /*
 378  * gethandlebynumeric:
 379  *  Given a numeric, gives the location in the servernicks table
 380  *  where it should be.  Does not check that the nick currently found
 381  *  there (if any) has the correct numeric; this is left to the
 382  *  calling function to figure out.
 383  */
 384
 385 nick **gethandlebynumeric(long numeric) {
 386   int servernum;
 387   int maskednum;
 388   server *serv;
 389
 390   /* Shift off the client identifier part of the numeric to get the server ID */
 391   servernum=(numeric>>18);
 392
 393   if ((serv=getserverdata(servernum))==NULL) {
 394     Error("nick",ERR_WARNING,"Numeric %ld refers to non-existent server %d",numeric,servernum);
 395     return NULL;
 396   }
 397
 398   /* Compute the masked numeric */
 399   maskednum=numeric&(serv->maxusernum);
 400
 401   return (servernicks[servernum])+maskednum;
 402 }
 403
 404 /*
 405  * getnickbynumeric[str]()
 406  *  These functions retrieve a nick based on it's numeric on the network
 407  *  Use the approriate function depending on how your numeric is expressed..
 408  */
 409
 410 nick *getnickbynumeric(long numeric) {
 411   nick **nh;
 412
 413   nh=gethandlebynumeric(numeric);
 414
 415   if ((*nh) && ((*nh)->numeric!=numeric)) {
 416     /* We found a masked numeric match, but the actual numeric
 417      * is different.  This counts as a miss. */
 418     return NULL;
 419   }
 420
 421   return (*nh);
 422 }
 423
 424 nick *getnickbynumericstr(char *numericstr) {
 425   return getnickbynumeric(numerictolong(numericstr,5));
 426 }
 427
 428 #endif
 429