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