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