ircd/gline.c

   1 /*
   2  * IRC - Internet Relay Chat, ircd/gline.c
   3  * Copyright (C) 1990 Jarkko Oikarinen and
   4  *                    University of Oulu, Finland
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2, or (at your option)
   9  * any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20 /** @file
  21  * @brief Implementation of Gline manipulation functions.
  22  * @version $Id: gline.c,v 1.61 2005/09/22 20:42:21 entrope Exp $
  23  */
  24 #include "config.h"
  25
  26 #include "gline.h"
  27 #include "channel.h"
  28 #include "client.h"
  29 #include "ircd.h"
  30 #include "ircd_alloc.h"
  31 #include "ircd_features.h"
  32 #include "ircd_log.h"
  33 #include "ircd_reply.h"
  34 #include "ircd_snprintf.h"
  35 #include "ircd_string.h"
  36 #include "match.h"
  37 #include "numeric.h"
  38 #include "s_bsd.h"
  39 #include "s_debug.h"
  40 #include "s_misc.h"
  41 #include "s_stats.h"
  42 #include "send.h"
  43 #include "struct.h"
  44 #include "msg.h"
  45 #include "numnicks.h"
  46 #include "numeric.h"
  47 #include "whocmds.h"
  48 #include "hash.h"
  49
  50 /* #include <assert.h> -- Now using assert in ircd_log.h */
  51 #include <string.h>
  52 #include <stdio.h>
  53 #include <stdlib.h>
  54
  55 #define CHECK_APPROVED     0    /**< Mask is acceptable */
  56 #define CHECK_OVERRIDABLE  1    /**< Mask is acceptable, but not by default */
  57 #define CHECK_REJECTED     2    /**< Mask is totally unacceptable */
  58
  59 #define MASK_WILD_0     0x01    /**< Wildcards in the last position */
  60 #define MASK_WILD_1     0x02    /**< Wildcards in the next-to-last position */
  61
  62 #define MASK_WILD_MASK  0x03    /**< Mask out the positional wildcards */
  63
  64 #define MASK_WILDS      0x10    /**< Mask contains wildcards */
  65 #define MASK_IP         0x20    /**< Mask is an IP address */
  66 #define MASK_HALT       0x40    /**< Finished processing mask */
  67
  68 /** List of user G-lines. */
  69 struct Gline* GlobalGlineList  = 0;
  70 /** List of BadChan G-lines. */
  71 struct Gline* BadChanGlineList = 0;
  72
  73 /** Find canonical user and host for a string.
  74  * If \a userhost starts with '$', assign \a userhost to *user_p and NULL to *host_p.
  75  * Otherwise, if \a userhost contains '@', assign the earlier part of it to *user_p and the rest to *host_p.
  76  * Otherwise, assign \a def_user to *user_p and \a userhost to *host_p.
  77  *
  78  * @param[in] userhost Input string from user.
  79  * @param[out] nick_p Gets pointer to nick part of hostmask.
  80  * @param[out] user_p Gets pointer to user (or channel/realname) part of hostmask.
  81  * @param[out] host_p Gets point to host part of hostmask (may be assigned NULL).
  82  * @param[in] def_user Default value for user part.
  83  */
  84 static void
  85 canon_userhost(char *userhost, char **nick_p, char **user_p, char **host_p, char *def_user)
  86 {
  87   char *tmp, *s;
  88
  89   if (*userhost == '$') {
  90     *user_p = userhost;
  91     *host_p = NULL;
  92     *nick_p = NULL;
  93     return;
  94   }
  95
  96   if ((tmp = strchr(userhost, '!'))) {
  97     *nick_p = userhost;
  98     *(tmp++) = '\0';
  99   } else {
 100     *nick_p = def_user;
 101     tmp = userhost;
 102   }
 103
 104   if (!(s = strchr(tmp, '@'))) {
 105     *user_p = def_user;
 106     *host_p = tmp;
 107   } else {
 108     *user_p = tmp;
 109     *(s++) = '\0';
 110     *host_p = s;
 111   }
 112 }
 113
 114 /** Create a Gline structure.
 115  * @param[in] nick Nick part of mask.
 116  * @param[in] user User part of mask.
 117  * @param[in] host Host part of mask (NULL if not applicable).
 118  * @param[in] reason Reason for G-line.
 119  * @param[in] expire Expiration timestamp.
 120  * @param[in] lastmod Last modification timestamp.
 121  * @param[in] flags Bitwise combination of GLINE_* bits.
 122  * @return Newly allocated G-line.
 123  */
 124 static struct Gline *
 125 make_gline(char *nick, char *user, char *host, char *reason, time_t expire, time_t lastmod,
 126            unsigned int flags)
 127 {
 128   struct Gline *gline, *sgline, *after = 0;
 129
 130   if (!(flags & (GLINE_BADCHAN|GLINE_REALNAME))) { /* search for overlapping glines first */
 131
 132     for (gline = GlobalGlineList; gline; gline = sgline) {
 133       sgline = gline->gl_next;
 134
 135       if (gline->gl_expire <= CurrentTime)
 136         gline_free(gline);
 137       else if (((gline->gl_flags & GLINE_LOCAL) != (flags & GLINE_LOCAL)) ||
 138                (gline->gl_host && !host) || (!gline->gl_host && host))
 139         continue;
 140       else if (!mmatch(gline->gl_nick, nick) && /* gline contains new mask */
 141                !mmatch(gline->gl_user, user)
 142                && (gline->gl_host == NULL || !mmatch(gline->gl_host, host))) {
 143         if (expire <= gline->gl_expire) /* will expire before wider gline */
 144           return 0;
 145         else
 146           after = gline; /* stick new gline after this one */
 147       } else if (!mmatch(nick, gline->gl_nick) && /* new mask contains gline */
 148                  !mmatch(user, gline->gl_user)
 149                  && (gline->gl_host==NULL || !mmatch(host, gline->gl_host))
 150                  && gline->gl_expire <= expire) /* old expires before new */
 151         gline_free(gline); /* save some memory */
 152     }
 153   }
 154
 155   gline = (struct Gline *)MyMalloc(sizeof(struct Gline)); /* alloc memory */
 156   assert(0 != gline);
 157
 158   DupString(gline->gl_reason, reason); /* initialize gline... */
 159   gline->gl_expire = expire;
 160   gline->gl_lastmod = lastmod;
 161   gline->gl_flags = flags & GLINE_MASK;
 162
 163   if (flags & GLINE_BADCHAN) { /* set a BADCHAN gline */
 164     DupString(gline->gl_user, user); /* first, remember channel */
 165     gline->gl_host = 0;
 166
 167     gline->gl_next = BadChanGlineList; /* then link it into list */
 168     gline->gl_prev_p = &BadChanGlineList;
 169     if (BadChanGlineList)
 170       BadChanGlineList->gl_prev_p = &gline->gl_next;
 171     BadChanGlineList = gline;
 172   } else {
 173     if (*user!='$')
 174       DupString(gline->gl_nick, nick); /* remember them... */
 175     else
 176       gline->gl_nick = 0;
 177     DupString(gline->gl_user, user);
 178     if (*user != '$')
 179       DupString(gline->gl_host, host);
 180     else
 181       gline->gl_host = NULL;
 182
 183     if (*user != '$' && ipmask_parse(host, &gline->gl_addr, &gline->gl_bits))
 184       gline->gl_flags |= GLINE_IPMASK;
 185
 186     if (after) {
 187       gline->gl_next = after->gl_next;
 188       gline->gl_prev_p = &after->gl_next;
 189       if (after->gl_next)
 190         after->gl_next->gl_prev_p = &gline->gl_next;
 191       after->gl_next = gline;
 192     } else {
 193       gline->gl_next = GlobalGlineList; /* then link it into list */
 194       gline->gl_prev_p = &GlobalGlineList;
 195       if (GlobalGlineList)
 196         GlobalGlineList->gl_prev_p = &gline->gl_next;
 197       GlobalGlineList = gline;
 198     }
 199   }
 200
 201   return gline;
 202 }
 203
 204 /** Check local clients against a new G-line.
 205  * If the G-line is inactive, return immediately.
 206  * Otherwise, if any users match it, disconnect them or kick them if the G-line is a BADCHAN.
 207  * @param[in] cptr Peer connect that sent the G-line.
 208  * @param[in] sptr Client that originated the G-line.
 209  * @param[in] gline New G-line to check.
 210  * @return Zero, unless \a sptr G-lined himself, in which case CPTR_KILLED.
 211  */
 212 static int
 213 do_gline(struct Client *cptr, struct Client *sptr, struct Gline *gline)
 214 {
 215   struct Client *acptr;
 216   int fd, retval = 0, tval;
 217
 218   if (!GlineIsActive(gline)) /* no action taken on inactive glines */
 219     return 0;
 220
 221   if (GlineIsBadChan(gline)) {
 222     /* Handle BADCHAN gline */
 223     struct Channel *chptr,*nchptr;
 224     struct Membership *member,*nmember;
 225
 226     if (string_has_wildcards(gline->gl_user)) {
 227       for(chptr=GlobalChannelList;chptr;chptr=nchptr) {
 228         nchptr=chptr->next;
 229         if (match(gline->gl_user, chptr->chname))
 230            continue;
 231         for (member=chptr->members;member;member=nmember) {
 232           nmember=member->next_member;
 233           if (!MyUser(member->user) || IsZombie(member) || IsAnOper(member->user))
 234             continue;
 235           sendcmdto_serv_butone(&me, CMD_KICK, NULL, "%H %C :Badchanneled (%s)", chptr, member->user, gline->gl_reason);
 236           sendcmdto_channel_butserv_butone(&me, CMD_KICK, chptr, NULL, 0, "%H %C :Badchanneled (%s)", chptr, member->user, gline->gl_reason);
 237           make_zombie(member, member->user, &me, &me, chptr);
 238           retval=1;
 239         }
 240       }
 241     } else {
 242       if ((chptr=FindChannel(gline->gl_user))) {
 243         for (member=chptr->members;member;member=nmember) {
 244           nmember=member->next_member;
 245           if (!MyUser(member->user) || IsZombie(member) || IsAnOper(member->user))
 246             continue;
 247           sendcmdto_serv_butone(&me, CMD_KICK, NULL, "%H %C :Badchanneled (%s)", chptr, member->user, gline->gl_reason);
 248           sendcmdto_channel_butserv_butone(&me, CMD_KICK, chptr, NULL, 0, "%H %C :Badchanneled (%s)", chptr, member->user, gline->gl_reason);
 249           make_zombie(member, member->user, &me, &me, chptr);
 250           retval=1;
 251         }
 252       }
 253     }
 254   } else {
 255     for (fd = HighestFd; fd >= 0; --fd) {
 256       /*
 257        * get the users!
 258        */
 259       if ((acptr = LocalClientArray[fd])) {
 260         if (!cli_user(acptr))
 261           continue;
 262
 263         if (GlineIsRealName(gline)) { /* Realname Gline */
 264           Debug((DEBUG_DEBUG,"Realname Gline: %s %s",(cli_info(acptr)),
 265                                           gline->gl_user+2));
 266           if (match(gline->gl_user+2, cli_info(acptr)) != 0)
 267               continue;
 268           Debug((DEBUG_DEBUG,"Matched!"));
 269         } else { /* Host/IP gline */
 270           if (cli_name(acptr) &&
 271               match(gline->gl_nick, cli_name(acptr)) !=0)
 272             continue;
 273
 274           if (cli_user(acptr)->username &&
 275               match(gline->gl_user, (cli_user(acptr))->realusername) != 0)
 276             continue;
 277
 278           if (GlineIsIpMask(gline)) {
 279             if (!ipmask_check(&cli_ip(acptr), &gline->gl_addr, gline->gl_bits))
 280               continue;
 281           }
 282           else {
 283             if (match(gline->gl_host, cli_sockhost(acptr)) != 0)
 284               continue;
 285           }
 286         }
 287
 288         /* ok, here's one that got G-lined */
 289         send_reply(acptr, SND_EXPLICIT | ERR_YOUREBANNEDCREEP, ":%s",
 290                    gline->gl_reason);
 291
 292         /* let the ops know about it */
 293         sendto_opmask_butone(0, SNO_GLINE, "G-line active for %s",
 294                              get_client_name(acptr, SHOW_IP));
 295
 296         /* and get rid of him */
 297         /* Asuka - Reimplement HEAD_IN_SAND_GLINE from Lain */
 298         if ((tval = exit_client_msg(cptr, acptr, &me,
 299             feature_bool(FEAT_HIS_GLINE) ? "G-lined" : "G-lined (%s)", gline->gl_reason)))
 300         retval = tval; /* retain killed status */
 301       }
 302     }
 303   }
 304   return retval;
 305 }
 306
 307 /**
 308  * Implements the mask checking applied to local G-lines.
 309  * Basically, host masks must have a minimum of two non-wild domain
 310  * fields, and IP masks must have a minimum of 16 bits.  If the mask
 311  * has even one wild-card, OVERRIDABLE is returned, assuming the other
 312  * check doesn't fail.
 313  * @param[in] mask G-line mask to check.
 314  * @return One of CHECK_REJECTED, CHECK_OVERRIDABLE, or CHECK_APPROVED.
 315  */
 316 static int
 317 gline_checkmask(char *mask)
 318 {
 319   unsigned int flags = MASK_IP;
 320   unsigned int dots = 0;
 321   unsigned int ipmask = 0;
 322
 323   for (; *mask; mask++) { /* go through given mask */
 324     if (*mask == '.') { /* it's a separator; advance positional wilds */
 325       flags = (flags & ~MASK_WILD_MASK) | ((flags << 1) & MASK_WILD_MASK);
 326       dots++;
 327
 328       if ((flags & (MASK_IP | MASK_WILDS)) == MASK_IP)
 329         ipmask += 8; /* It's an IP with no wilds, count bits */
 330     } else if (*mask == '*' || *mask == '?')
 331       flags |= MASK_WILD_0 | MASK_WILDS; /* found a wildcard */
 332     else if (*mask == '/') { /* n.n.n.n/n notation; parse bit specifier */
 333       ++mask;
 334       ipmask = strtoul(mask, &mask, 10);
 335
 336       /* sanity-check to date */
 337       if (*mask || (flags & (MASK_WILDS | MASK_IP)) != MASK_IP)
 338         return CHECK_REJECTED;
 339       if (!dots) {
 340         if (ipmask > 128)
 341           return CHECK_REJECTED;
 342         if (ipmask < 128)
 343           flags |= MASK_WILDS;
 344       } else {
 345         if (dots != 3 || ipmask > 32)
 346           return CHECK_REJECTED;
 347         if (ipmask < 32)
 348           flags |= MASK_WILDS;
 349       }
 350
 351       flags |= MASK_HALT; /* Halt the ipmask calculation */
 352       break; /* get out of the loop */
 353     } else if (!IsIP6Char(*mask)) {
 354       flags &= ~MASK_IP; /* not an IP anymore! */
 355       ipmask = 0;
 356     }
 357   }
 358
 359   /* Sanity-check quads */
 360   if (dots > 3 || (!(flags & MASK_WILDS) && dots < 3)) {
 361     flags &= ~MASK_IP;
 362     ipmask = 0;
 363   }
 364
 365   /* update bit count if necessary */
 366   if ((flags & (MASK_IP | MASK_WILDS | MASK_HALT)) == MASK_IP)
 367     ipmask += 8;
 368
 369   /* Check to see that it's not too wide of a mask */
 370   if (flags & MASK_WILDS &&
 371       ((!(flags & MASK_IP) && (dots < 2 || flags & MASK_WILD_MASK)) ||
 372        (flags & MASK_IP && ipmask < 16)))
 373     return CHECK_REJECTED; /* to wide, reject */
 374
 375   /* Ok, it's approved; require override if it has wildcards, though */
 376   return flags & MASK_WILDS ? CHECK_OVERRIDABLE : CHECK_APPROVED;
 377 }
 378
 379 /** Forward a G-line to other servers.
 380  * @param[in] cptr Client that sent us the G-line.
 381  * @param[in] sptr Client that originated the G-line.
 382  * @param[in] gline G-line to forward.
 383  * @return Zero.
 384  */
 385 int
 386 gline_propagate(struct Client *cptr, struct Client *sptr, struct Gline *gline)
 387 {
 388   if (GlineIsLocal(gline) || (IsUser(sptr) && !gline->gl_lastmod))
 389     return 0;
 390
 391   if (gline->gl_lastmod)
 392     sendcmdto_serv_butone(sptr, CMD_GLINE, cptr, "* %c%s%s%s%s%s %Tu %Tu :%s",
 393                           GlineIsRemActive(gline) ? '+' : '-',
 394                           GlineIsBadChan(gline)|GlineIsRealName(gline) ? "" : gline->gl_nick,
 395                           GlineIsBadChan(gline)|GlineIsRealName(gline) ? "" : "!",
 396                           gline->gl_user,
 397                           gline->gl_host ? "@" : "",
 398                           gline->gl_host ? gline->gl_host : "",
 399                           gline->gl_expire - CurrentTime, gline->gl_lastmod,
 400                           gline->gl_reason);
 401   else
 402     sendcmdto_serv_butone(sptr, CMD_GLINE, cptr,
 403                           (GlineIsRemActive(gline) ?
 404                           "* +%s%s%s%s%s %Tu :%s" : "* -%s%s%s%s%s"),
 405                           GlineIsBadChan(gline)|GlineIsRealName(gline) ? "" : gline->gl_nick,
 406                           GlineIsBadChan(gline)|GlineIsRealName(gline) ? "" : "!",
 407                           gline->gl_user,
 408                           gline->gl_host ? "@" : "",
 409                           gline->gl_host ? gline->gl_host : "",
 410                           gline->gl_expire - CurrentTime, gline->gl_reason);
 411
 412   return 0;
 413 }
 414
 415 /** Create a new G-line and add it to global lists.
 416  * \a userhost may be in one of four forms:
 417  * \li A channel name, to add a BadChan.
 418  * \li A string starting with $R and followed by a mask to match against their realname.
 419  * \li A user\@IP mask (user\@ part optional) to create an IP-based ban.
 420  * \li A user\@host mask (user\@ part optional) to create a hostname ban.
 421  *
 422  * @param[in] cptr Client that sent us the G-line.
 423  * @param[in] sptr Client that originated the G-line.
 424  * @param[in] userhost Text mask for the G-line.
 425  * @param[in] reason Reason for G-line.
 426  * @param[in] expire Duration of G-line in seconds.
 427  * @param[in] lastmod Last modification time of G-line.
 428  * @param[in] flags Bitwise combination of GLINE_* flags.
 429  * @return Zero or CPTR_KILLED, depending on whether \a sptr is suicidal.
 430  */
 431 int
 432 gline_add(struct Client *cptr, struct Client *sptr, char *userhost,
 433           char *reason, time_t expire, time_t lastmod, unsigned int flags)
 434 {
 435   struct Gline *agline;
 436   char uhmask[NICKLEN + USERLEN + HOSTLEN + 3];
 437   char *nick, *user, *host;
 438   int tmp;
 439
 440   assert(0 != userhost);
 441   assert(0 != reason);
 442
 443   if (*userhost == '#' || *userhost == '&') {
 444     if ((flags & GLINE_LOCAL) && !HasPriv(sptr, PRIV_LOCAL_BADCHAN))
 445       return send_reply(sptr, ERR_NOPRIVILEGES);
 446
 447     flags |= GLINE_BADCHAN;
 448     user = userhost;
 449     host = 0;
 450   } else if (*userhost == '$') {
 451     switch (*userhost == '$' ? userhost[1] : userhost[3]) {
 452       case 'R': flags |= GLINE_REALNAME; break;
 453       default:
 454         /* uh, what to do here? */
 455         /* The answer, my dear Watson, is we throw a protocol_violation()
 456            -- hikari */
 457         if (IsServer(cptr))
 458           return protocol_violation(sptr,"%s has been smoking the sweet leaf and sent me a whacky gline",cli_name(sptr));
 459         else {
 460          sendto_opmask_butone(NULL, SNO_GLINE, "%s has been smoking the sweet leaf and sent me a whacky gline", cli_name(sptr));
 461          return 0;
 462         }
 463         break;
 464     }
 465      user = (*userhost =='$' ? userhost : userhost+2);
 466      host = 0;
 467   } else {
 468     canon_userhost(userhost, &nick, &user, &host, "*");
 469     if (sizeof(uhmask) <
 470         ircd_snprintf(0, uhmask, sizeof(uhmask), "%s@%s", user, host))
 471       return send_reply(sptr, ERR_LONGMASK);
 472     else if (MyUser(sptr) || (IsUser(sptr) && flags & GLINE_LOCAL)) {
 473       switch (gline_checkmask(host)) {
 474       case CHECK_OVERRIDABLE: /* oper overrided restriction */
 475         if (flags & GLINE_OPERFORCE)
 476           break;
 477         /*FALLTHROUGH*/
 478       case CHECK_REJECTED:
 479         return send_reply(sptr, ERR_MASKTOOWIDE, uhmask);
 480         break;
 481       }
 482
 483       if ((tmp = count_users(uhmask)) >=
 484           feature_int(FEAT_GLINEMAXUSERCOUNT) && !(flags & GLINE_OPERFORCE))
 485         return send_reply(sptr, ERR_TOOMANYUSERS, tmp);
 486     }
 487   }
 488
 489   /*
 490    * You cannot set a negative (or zero) expire time, nor can you set an
 491    * expiration time for greater than GLINE_MAX_EXPIRE.
 492    */
 493   if (!(flags & GLINE_FORCE) && (expire <= 0 || expire > GLINE_MAX_EXPIRE)) {
 494     if (!IsServer(sptr) && MyConnect(sptr))
 495       send_reply(sptr, ERR_BADEXPIRE, expire);
 496     return 0;
 497   }
 498
 499   expire += CurrentTime; /* convert from lifetime to timestamp */
 500
 501   /* Inform ops... */
 502   sendto_opmask_butone(0, ircd_strncmp(reason, "AUTO", 4) ? SNO_GLINE :
 503                        SNO_AUTO, "%s adding %s %s for %s%s%s%s%s, expiring at "
 504                        "%Tu: %s",
 505                        (feature_bool(FEAT_HIS_SNOTICES) || IsServer(sptr)) ?
 506                          cli_name(sptr) :
 507                          cli_name((cli_user(sptr))->server),
 508                        (flags & GLINE_LOCAL) ? "local" : "global",
 509                        (flags & GLINE_BADCHAN) ? "BADCHAN" : "GLINE",
 510                        (flags & (GLINE_BADCHAN|GLINE_REALNAME)) ? "" : nick,
 511                        (flags & (GLINE_BADCHAN|GLINE_REALNAME)) ? "" : "!",
 512                        user,
 513                        (flags & (GLINE_BADCHAN|GLINE_REALNAME)) ? "" : "@",
 514                        (flags & (GLINE_BADCHAN|GLINE_REALNAME)) ? "" : host,
 515                        expire + TSoffset, reason);
 516
 517   /* and log it */
 518   log_write(LS_GLINE, L_INFO, LOG_NOSNOTICE,
 519             "%#C adding %s %s for %s%s%s%s%s, expiring at %Tu: %s", sptr,
 520             flags & GLINE_LOCAL ? "local" : "global",
 521             flags & GLINE_BADCHAN ? "BADCHAN" : "GLINE",
 522             flags & (GLINE_BADCHAN|GLINE_REALNAME) ? "" : nick,
 523             flags & (GLINE_BADCHAN|GLINE_REALNAME) ? "" : "!",
 524             user,
 525             flags & (GLINE_BADCHAN|GLINE_REALNAME) ? "" : "@",
 526             flags & (GLINE_BADCHAN|GLINE_REALNAME) ? "" : host,
 527             expire + TSoffset, reason);
 528
 529   /* make the gline */
 530   agline = make_gline(nick, user, host, reason, expire, lastmod, flags);
 531
 532   if (!agline) /* if it overlapped, silently return */
 533     return 0;
 534
 535   gline_propagate(cptr, sptr, agline);
 536
 537   return do_gline(cptr, sptr, agline); /* knock off users if necessary */
 538 }
 539
 540 /** Activate a currently inactive G-line.
 541  * @param[in] cptr Peer that told us to activate the G-line.
 542  * @param[in] sptr Client that originally thought it was a good idea.
 543  * @param[in] gline G-line to activate.
 544  * @param[in] lastmod New value for last modification timestamp.
 545  * @param[in] flags 0 if the activation should be propagated, GLINE_LOCAL if not.
 546  * @return Zero, unless \a sptr had a death wish (in which case CPTR_KILLED).
 547  */
 548 int
 549 gline_activate(struct Client *cptr, struct Client *sptr, struct Gline *gline,
 550                time_t lastmod, unsigned int flags)
 551 {
 552   unsigned int saveflags = 0;
 553
 554   assert(0 != gline);
 555
 556   saveflags = gline->gl_flags;
 557
 558   if (flags & GLINE_LOCAL)
 559     gline->gl_flags &= ~GLINE_LDEACT;
 560   else {
 561     gline->gl_flags |= GLINE_ACTIVE;
 562
 563     if (gline->gl_lastmod) {
 564       if (gline->gl_lastmod >= lastmod) /* force lastmod to increase */
 565         gline->gl_lastmod++;
 566       else
 567         gline->gl_lastmod = lastmod;
 568     }
 569   }
 570
 571   if ((saveflags & GLINE_ACTMASK) == GLINE_ACTIVE)
 572     return 0; /* was active to begin with */
 573
 574   /* Inform ops and log it */
 575   sendto_opmask_butone(0, SNO_GLINE, "%s activating global %s for %s%s%s%s%s, "
 576                        "expiring at %Tu: %s",
 577                        (feature_bool(FEAT_HIS_SNOTICES) || IsServer(sptr)) ?
 578                          cli_name(sptr) :
 579                          cli_name((cli_user(sptr))->server),
 580                        GlineIsBadChan(gline) ? "BADCHAN" : "GLINE",
 581                        GlineIsBadChan(gline)|GlineIsRealName(gline) ? "" : gline->gl_nick,
 582                        GlineIsBadChan(gline)|GlineIsRealName(gline) ? "" : "!",
 583                        gline->gl_user, gline->gl_host ? "@" : "",
 584                        gline->gl_host ? gline->gl_host : "",
 585                        gline->gl_expire + TSoffset, gline->gl_reason);
 586
 587   log_write(LS_GLINE, L_INFO, LOG_NOSNOTICE,
 588             "%#C activating global %s for %s%s%s%s%s, expiring at %Tu: %s", sptr,
 589             GlineIsBadChan(gline) ? "BADCHAN" : "GLINE",
 590             GlineIsBadChan(gline)|GlineIsRealName(gline) ? "" : gline->gl_nick,
 591             GlineIsBadChan(gline)|GlineIsRealName(gline) ? "" : "!",
 592             gline->gl_user,
 593             gline->gl_host ? "@" : "",
 594             gline->gl_host ? gline->gl_host : "",
 595             gline->gl_expire + TSoffset, gline->gl_reason);
 596
 597   if (!(flags & GLINE_LOCAL)) /* don't propagate local changes */
 598     gline_propagate(cptr, sptr, gline);
 599
 600   return do_gline(cptr, sptr, gline);
 601 }
 602
 603 /** Deactivate a G-line.
 604  * @param[in] cptr Peer that gave us the message.
 605  * @param[in] sptr Client that initiated the deactivation.
 606  * @param[in] gline G-line to deactivate.
 607  * @param[in] lastmod New value for G-line last modification timestamp.
 608  * @param[in] flags GLINE_LOCAL to only deactivate locally, 0 to propagate.
 609  * @return Zero.
 610  */
 611 int
 612 gline_deactivate(struct Client *cptr, struct Client *sptr, struct Gline *gline,
 613                  time_t lastmod, unsigned int flags)
 614 {
 615   unsigned int saveflags = 0;
 616   char *msg;
 617
 618   assert(0 != gline);
 619
 620   saveflags = gline->gl_flags;
 621
 622   if (GlineIsLocal(gline))
 623     msg = "removing local";
 624   else if (!gline->gl_lastmod && !(flags & GLINE_LOCAL)) {
 625     msg = "removing global";
 626     gline->gl_flags &= ~GLINE_ACTIVE; /* propagate a -<mask> */
 627   } else {
 628     msg = "deactivating global";
 629
 630     if (flags & GLINE_LOCAL)
 631       gline->gl_flags |= GLINE_LDEACT;
 632     else {
 633       gline->gl_flags &= ~GLINE_ACTIVE;
 634
 635       if (gline->gl_lastmod) {
 636         if (gline->gl_lastmod >= lastmod)
 637           gline->gl_lastmod++;
 638         else
 639           gline->gl_lastmod = lastmod;
 640       }
 641     }
 642
 643     if ((saveflags & GLINE_ACTMASK) != GLINE_ACTIVE)
 644       return 0; /* was inactive to begin with */
 645   }
 646
 647   /* Inform ops and log it */
 648   sendto_opmask_butone(0, SNO_GLINE, "%s %s %s for %s%s%s%s%s, expiring at %Tu: "
 649                        "%s",
 650                        (feature_bool(FEAT_HIS_SNOTICES) || IsServer(sptr)) ?
 651                          cli_name(sptr) :
 652                          cli_name((cli_user(sptr))->server),
 653                        msg, GlineIsBadChan(gline) ? "BADCHAN" : "GLINE",
 654                        GlineIsBadChan(gline)|GlineIsRealName(gline) ? "" : gline->gl_nick,
 655                        GlineIsBadChan(gline)|GlineIsRealName(gline) ? "" : "!",
 656                        gline->gl_user, gline->gl_host ? "@" : "",
 657                        gline->gl_host ? gline->gl_host : "",
 658                        gline->gl_expire + TSoffset, gline->gl_reason);
 659
 660   log_write(LS_GLINE, L_INFO, LOG_NOSNOTICE,
 661             "%#C %s %s for %s%s%s%s%s, expiring at %Tu: %s", sptr, msg,
 662             GlineIsBadChan(gline) ? "BADCHAN" : "GLINE",
 663             GlineIsBadChan(gline)|GlineIsRealName(gline) ? "" : gline->gl_nick,
 664             GlineIsBadChan(gline)|GlineIsRealName(gline) ? "" : "!",
 665             gline->gl_user,
 666             gline->gl_host ? "@" : "",
 667             gline->gl_host ? gline->gl_host : "",
 668             gline->gl_expire + TSoffset, gline->gl_reason);
 669
 670   if (!(flags & GLINE_LOCAL)) /* don't propagate local changes */
 671     gline_propagate(cptr, sptr, gline);
 672
 673   /* if it's a local gline or a Uworld gline (and not locally deactivated).. */
 674   if (GlineIsLocal(gline) || (!gline->gl_lastmod && !(flags & GLINE_LOCAL)))
 675     gline_free(gline); /* get rid of it */
 676
 677   return 0;
 678 }
 679
 680 /** Find a G-line for a particular mask, guided by certain flags.
 681  * Certain bits in \a flags are interpreted specially:
 682  * <dl>
 683  * <dt>GLINE_ANY</dt><dd>Search both BadChans and user G-lines.</dd>
 684  * <dt>GLINE_BADCHAN</dt><dd>Search BadChans.</dd>
 685  * <dt>GLINE_GLOBAL</dt><dd>Only match global G-lines.</dd>
 686  * <dt>GLINE_LASTMOD</dt><dd>Only match G-lines with a last modification time.</dd>
 687  * <dt>GLINE_EXACT</dt><dd>Require an exact match of G-line mask.</dd>
 688  * <dt>anything else</dt><dd>Search user G-lines.</dd>
 689  * </dl>
 690  * @param[in] userhost Mask to search for.
 691  * @param[in] flags Bitwise combination of GLINE_* flags.
 692  * @return First matching G-line, or NULL if none are found.
 693  */
 694 struct Gline *
 695 gline_find(char *userhost, unsigned int flags)
 696 {
 697   struct Gline *gline;
 698   struct Gline *sgline;
 699   char *nick, *user, *host, *t_uh;
 700
 701   if (flags & (GLINE_BADCHAN | GLINE_ANY)) {
 702     for (gline = BadChanGlineList; gline; gline = sgline) {
 703       sgline = gline->gl_next;
 704
 705       if (gline->gl_expire <= CurrentTime)
 706         gline_free(gline);
 707       else if ((flags & GLINE_GLOBAL && gline->gl_flags & GLINE_LOCAL) ||
 708                (flags & GLINE_LASTMOD && !gline->gl_lastmod))
 709         continue;
 710       else if ((flags & GLINE_EXACT ? ircd_strcmp(gline->gl_user, userhost) :
 711                 match(gline->gl_user, userhost)) == 0)
 712         return gline;
 713     }
 714   }
 715
 716   if ((flags & (GLINE_BADCHAN | GLINE_ANY)) == GLINE_BADCHAN ||
 717       *userhost == '#' || *userhost == '&')
 718     return 0;
 719
 720   DupString(t_uh, userhost);
 721   canon_userhost(t_uh, &nick, &user, &host, "*");
 722
 723   for (gline = GlobalGlineList; gline; gline = sgline) {
 724     sgline = gline->gl_next;
 725
 726     if (gline->gl_expire <= CurrentTime)
 727       gline_free(gline);
 728     else if ((flags & GLINE_GLOBAL && gline->gl_flags & GLINE_LOCAL) ||
 729              (flags & GLINE_LASTMOD && !gline->gl_lastmod))
 730       continue;
 731     else if (flags & GLINE_EXACT) {
 732       if (((gline->gl_host && host && ircd_strcmp(gline->gl_host, host) == 0)
 733            || (!gline->gl_host && !host)) &&
 734             ((!user && ircd_strcmp(gline->gl_user, "*") == 0) ||
 735             (user && ircd_strcmp(gline->gl_user, user) == 0)) &&
 736             ((!nick && gline->gl_nick && ircd_strcmp(gline->gl_nick, "*") == 0) ||
 737             (nick && gline->gl_nick && ircd_strcmp(gline->gl_nick, nick) == 0) || (!gline->gl_nick && !nick)))
 738         break;
 739     } else {
 740       if (((gline->gl_host && host && match(gline->gl_host, host) == 0)
 741            || (!gline->gl_host && !host)) &&
 742             ((!user && ircd_strcmp(gline->gl_user, "*") == 0) ||
 743             (user && match(gline->gl_user, user) == 0)) &&
 744             ((!nick && gline->gl_nick && ircd_strcmp(gline->gl_nick, "*") == 0) ||
 745             (nick && gline->gl_nick && (match(gline->gl_nick, nick) == 0)) || (!gline->gl_nick && !nick)))
 746       break;
 747     }
 748   }
 749
 750   MyFree(t_uh);
 751
 752   return gline;
 753 }
 754
 755 /** Find a matching G-line for a user.
 756  * @param[in] cptr Client to compare against.
 757  * @param[in] flags Bitwise combination of GLINE_GLOBAL and/or
 758  * GLINE_LASTMOD to limit matches.
 759  * @return Matching G-line, or NULL if none are found.
 760  */
 761 struct Gline *
 762 gline_lookup(struct Client *cptr, unsigned int flags)
 763 {
 764   struct Gline *gline;
 765   struct Gline *sgline;
 766
 767   for (gline = GlobalGlineList; gline; gline = sgline) {
 768     sgline = gline->gl_next;
 769
 770     if (gline->gl_expire <= CurrentTime) {
 771       gline_free(gline);
 772       continue;
 773     }
 774
 775     if ((flags & GLINE_GLOBAL && gline->gl_flags & GLINE_LOCAL) ||
 776         (flags & GLINE_LASTMOD && !gline->gl_lastmod))
 777       continue;
 778
 779     if (GlineIsRealName(gline)) {
 780       Debug((DEBUG_DEBUG,"realname gline: '%s' '%s'",gline->gl_user,cli_info(cptr)));
 781       if (match(gline->gl_user+2, cli_info(cptr)) != 0)
 782         continue;
 783     }
 784     else {
 785       if (match(gline->gl_nick, cli_name(cptr)) != 0)
 786         continue;
 787       if (match(gline->gl_user, (cli_user(cptr))->realusername) != 0)
 788         continue;
 789
 790       if (GlineIsIpMask(gline)) {
 791         if (!ipmask_check(&cli_ip(cptr), &gline->gl_addr, gline->gl_bits))
 792           continue;
 793       }
 794       else {
 795         if (match(gline->gl_host, (cli_user(cptr))->realhost) != 0)
 796           continue;
 797       }
 798     }
 799     if (GlineIsActive(gline))
 800       return gline;
 801   }
 802   /*
 803    * No Glines matched
 804    */
 805   return 0;
 806 }
 807
 808 /** Delink and free a G-line.
 809  * @param[in] gline G-line to free.
 810  */
 811 void
 812 gline_free(struct Gline *gline)
 813 {
 814   assert(0 != gline);
 815
 816   *gline->gl_prev_p = gline->gl_next; /* squeeze this gline out */
 817   if (gline->gl_next)
 818     gline->gl_next->gl_prev_p = gline->gl_prev_p;
 819
 820   MyFree(gline->gl_user); /* free up the memory */
 821   if (gline->gl_host)
 822     MyFree(gline->gl_host);
 823   MyFree(gline->gl_reason);
 824   MyFree(gline);
 825 }
 826
 827 /** Burst all known global G-lines to another server.
 828  * @param[in] cptr Destination of burst.
 829  */
 830 void
 831 gline_burst(struct Client *cptr)
 832 {
 833   struct Gline *gline;
 834   struct Gline *sgline;
 835
 836   for (gline = GlobalGlineList; gline; gline = sgline) { /* all glines */
 837     sgline = gline->gl_next;
 838
 839     if (gline->gl_expire <= CurrentTime) /* expire any that need expiring */
 840       gline_free(gline);
 841     else if (!GlineIsLocal(gline) && gline->gl_lastmod)
 842       sendcmdto_one(&me, CMD_GLINE, cptr, "* %c%s%s%s%s%s %Tu %Tu :%s",
 843                     GlineIsRemActive(gline) ? '+' : '-',
 844                     gline->gl_nick ? gline->gl_nick : "",
 845                     gline->gl_nick ? "!" : "",
 846                     gline->gl_user,
 847
 848                     gline->gl_host ? "@" : "",
 849                     gline->gl_host ? gline->gl_host : "",
 850                     gline->gl_expire - CurrentTime, gline->gl_lastmod,
 851                     gline->gl_reason);
 852   }
 853
 854   for (gline = BadChanGlineList; gline; gline = sgline) { /* all glines */
 855     sgline = gline->gl_next;
 856
 857     if (gline->gl_expire <= CurrentTime) /* expire any that need expiring */
 858       gline_free(gline);
 859     else if (!GlineIsLocal(gline) && gline->gl_lastmod)
 860       sendcmdto_one(&me, CMD_GLINE, cptr, "* %c%s %Tu %Tu :%s",
 861                     GlineIsRemActive(gline) ? '+' : '-', gline->gl_user,
 862                     gline->gl_expire - CurrentTime, gline->gl_lastmod,
 863                     gline->gl_reason);
 864   }
 865 }
 866
 867 /** Send a G-line to another server.
 868  * @param[in] cptr Who to inform of the G-line.
 869  * @param[in] gline G-line to send.
 870  * @return Zero.
 871  */
 872 int
 873 gline_resend(struct Client *cptr, struct Gline *gline)
 874 {
 875   if (GlineIsLocal(gline) || !gline->gl_lastmod)
 876     return 0;
 877
 878   sendcmdto_one(&me, CMD_GLINE, cptr, "* %c%s%s%s %Tu %Tu :%s",
 879                 GlineIsRemActive(gline) ? '+' : '-', gline->gl_user,
 880                 gline->gl_host ? "@" : "",
 881                 gline->gl_host ? gline->gl_host : "",
 882                 gline->gl_expire - CurrentTime, gline->gl_lastmod,
 883                 gline->gl_reason);
 884
 885   return 0;
 886 }
 887
 888 /** Display one or all G-lines to a user.
 889  * If \a userhost is not NULL, only send the first matching G-line.
 890  * Otherwise send the whole list.
 891  * @param[in] sptr User asking for G-line list.
 892  * @param[in] userhost G-line mask to search for (or NULL).
 893  * @return Zero.
 894  */
 895 int
 896 gline_list(struct Client *sptr, char *userhost)
 897 {
 898   struct Gline *gline;
 899   struct Gline *sgline;
 900
 901   if (userhost) {
 902     if (!(gline = gline_find(userhost, GLINE_ANY))) /* no such gline */
 903       return send_reply(sptr, ERR_NOSUCHGLINE, userhost);
 904
 905     /* send gline information along */
 906     send_reply(sptr, RPL_GLIST,
 907                GlineIsBadChan(gline) | GlineIsRealName(gline) ? "" : gline->gl_nick,
 908                GlineIsBadChan(gline) | GlineIsRealName(gline) ? "" : "!",
 909                gline->gl_user, GlineIsBadChan(gline) || GlineIsRealName(gline) ? "" : "@",
 910                gline->gl_host ? "@" : "",
 911                gline->gl_host ? gline->gl_host : "",
 912                gline->gl_expire + TSoffset,
 913                GlineIsLocal(gline) ? cli_name(&me) : "*",
 914                GlineIsActive(gline) ? '+' : '-', gline->gl_reason);
 915   } else {
 916     for (gline = GlobalGlineList; gline; gline = sgline) {
 917       sgline = gline->gl_next;
 918
 919       if (gline->gl_expire <= CurrentTime)
 920         gline_free(gline);
 921       else
 922        send_reply(sptr, RPL_GLIST,
 923                    gline->gl_nick ? gline->gl_nick : "",
 924                    gline->gl_nick ? "!" : "",
 925                    gline->gl_user,
 926                    gline->gl_host ? "@" : "",
 927                    gline->gl_host ? gline->gl_host : "",
 928                    gline->gl_expire + TSoffset,
 929                    GlineIsLocal(gline) ? cli_name(&me) : "*",
 930                    GlineIsActive(gline) ? '+' : '-', gline->gl_reason);
 931     }
 932
 933     for (gline = BadChanGlineList; gline; gline = sgline) {
 934       sgline = gline->gl_next;
 935
 936       if (gline->gl_expire <= CurrentTime)
 937         gline_free(gline);
 938       else
 939        send_reply(sptr, RPL_GLIST, gline->gl_user, "", "", "", "",
 940                    gline->gl_expire + TSoffset,
 941                    GlineIsLocal(gline) ? cli_name(&me) : "*",
 942                    GlineIsActive(gline) ? '+' : '-', gline->gl_reason);
 943     }
 944   }
 945
 946   /* end of gline information */
 947   return send_reply(sptr, RPL_ENDOFGLIST);
 948 }
 949
 950 /** Statistics callback to list G-lines.
 951  * @param[in] sptr Client requesting statistics.
 952  * @param[in] sd Stats descriptor for request (ignored).
 953  * @param[in] param Extra parameter from user (ignored).
 954  */
 955 void
 956 gline_stats(struct Client *sptr, const struct StatDesc *sd,
 957             char *param)
 958 {
 959   struct Gline *gline;
 960   struct Gline *sgline;
 961
 962   for (gline = GlobalGlineList; gline; gline = sgline) {
 963     sgline = gline->gl_next;
 964
 965     if (gline->gl_expire <= CurrentTime)
 966       gline_free(gline);
 967     else
 968       send_reply(sptr, RPL_STATSGLINE, 'G',
 969                  gline->gl_nick ? gline->gl_nick : "",
 970                  gline->gl_nick ? "!" : "",
 971                  gline->gl_user,
 972                  gline->gl_host ? "@" : "",
 973                  gline->gl_host ? gline->gl_host : "",
 974                  gline->gl_expire + TSoffset, gline->gl_reason);
 975   }
 976 }
 977
 978 /** Calculate memory used by G-lines.
 979  * @param[out] gl_size Number of bytes used by G-lines.
 980  * @return Number of G-lines in use.
 981  */
 982 int
 983 gline_memory_count(size_t *gl_size)
 984 {
 985   struct Gline *gline;
 986   unsigned int gl = 0;
 987
 988   for (gline = GlobalGlineList; gline; gline = gline->gl_next)
 989   {
 990     gl++;
 991     *gl_size += sizeof(struct Gline);
 992     *gl_size += gline->gl_nick ? (strlen(gline->gl_nick) +1) : 0;
 993     *gl_size += gline->gl_user ? (strlen(gline->gl_user) + 1) : 0;
 994     *gl_size += gline->gl_host ? (strlen(gline->gl_host) + 1) : 0;
 995     *gl_size += gline->gl_reason ? (strlen(gline->gl_reason) + 1) : 0;
 996   }
 997   return gl;
 998 }
 999
1000 struct Gline *
1001 IsNickGlined(struct Client *cptr, char *nick)
1002 {
1003   struct Gline *gline;
1004   struct Gline *sgline;
1005
1006   for (gline = GlobalGlineList; gline; gline = sgline) {
1007     sgline = gline->gl_next;
1008
1009     if (gline->gl_expire <= CurrentTime) {
1010       gline_free(gline);
1011       continue;
1012     }
1013
1014     if (GlineIsRealName(gline)) /* skip realname glines */
1015       continue;
1016
1017     if (!ircd_strcmp(gline->gl_nick, "*"))     /* skip glines w. wildcarded nick */
1018       continue;
1019
1020     if (match(gline->gl_nick, nick) != 0)
1021       continue;
1022
1023     if (match(gline->gl_user, (cli_user(cptr))->username) != 0)
1024       continue;
1025
1026     if (GlineIsIpMask(gline)) {
1027       if (!ipmask_check(&(cli_ip(cptr)), &gline->gl_addr, gline->gl_bits))
1028         continue;
1029     }
1030     else {
1031       if (match(gline->gl_host, (cli_user(cptr))->realhost) != 0)
1032         continue;
1033     }
1034     return gline;
1035   }
1036   /*
1037    * No Glines matched
1038    */
1039   return 0;
1040 }
1041