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