modules/m_kline.c

   1 /*
   2  *  ircd-ratbox: A slightly useful ircd.
   3  *  m_kline.c: Bans/unbans a user.
   4  *
   5  *  Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
   6  *  Copyright (C) 1996-2002 Hybrid Development Team
   7  *  Copyright (C) 2002-2005 ircd-ratbox development team
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  22  *  USA
  23  *
  24  *  $Id: m_kline.c 3063 2006-12-27 00:47:45Z jilles $
  25  */
  26
  27 #include "stdinc.h"
  28 #include "tools.h"
  29 #include "channel.h"
  30 #include "class.h"
  31 #include "client.h"
  32 #include "common.h"
  33 #include "irc_string.h"
  34 #include "sprintf_irc.h"
  35 #include "ircd.h"
  36 #include "hostmask.h"
  37 #include "numeric.h"
  38 #include "commio.h"
  39 #include "s_conf.h"
  40 #include "s_newconf.h"
  41 #include "s_log.h"
  42 #include "send.h"
  43 #include "hash.h"
  44 #include "s_serv.h"
  45 #include "msg.h"
  46 #include "parse.h"
  47 #include "modules.h"
  48 #include "event.h"
  49
  50 static int mo_kline(struct Client *, struct Client *, int, const char **);
  51 static int ms_kline(struct Client *, struct Client *, int, const char **);
  52 static int me_kline(struct Client *, struct Client *, int, const char **);
  53 static int mo_unkline(struct Client *, struct Client *, int, const char **);
  54 static int ms_unkline(struct Client *, struct Client *, int, const char **);
  55 static int me_unkline(struct Client *, struct Client *, int, const char **);
  56
  57 struct Message kline_msgtab = {
  58         "KLINE", 0, 0, 0, MFLG_SLOW,
  59         {mg_unreg, mg_not_oper, {ms_kline, 5}, {ms_kline, 5}, {me_kline, 5}, {mo_kline, 3}}
  60 };
  61
  62 struct Message unkline_msgtab = {
  63         "UNKLINE", 0, 0, 0, MFLG_SLOW,
  64         {mg_unreg, mg_not_oper, {ms_unkline, 4}, {ms_unkline, 4}, {me_unkline, 3}, {mo_unkline, 2}}
  65 };
  66
  67 mapi_clist_av1 kline_clist[] = { &kline_msgtab, &unkline_msgtab, NULL };
  68 DECLARE_MODULE_AV1(kline, NULL, NULL, kline_clist, NULL, NULL, "$Revision: 3063 $");
  69
  70 /* Local function prototypes */
  71 static int find_user_host(struct Client *source_p, const char *userhost, char *user, char *host);
  72 static int valid_comment(struct Client *source_p, char *comment);
  73 static int valid_user_host(struct Client *source_p, const char *user, const char *host);
  74 static int valid_wild_card(struct Client *source_p, const char *user, const char *host);
  75
  76 static void handle_remote_kline(struct Client *source_p, int tkline_time,
  77                 const char *user, const char *host, const char *reason);
  78 static void apply_kline(struct Client *source_p, struct ConfItem *aconf,
  79                         const char *reason, const char *oper_reason, const char *current_date);
  80 static void apply_tkline(struct Client *source_p, struct ConfItem *aconf,
  81                          const char *, const char *, const char *, int);
  82 static int already_placed_kline(struct Client *, const char *, const char *, int);
  83
  84 static void handle_remote_unkline(struct Client *source_p,
  85                         const char *user, const char *host);
  86 static void remove_permkline_match(struct Client *, const char *, const char *);
  87 static int flush_write(struct Client *, FILE *, const char *, const char *);
  88 static int remove_temp_kline(const char *, const char *);
  89
  90 /* mo_kline()
  91  *
  92  *   parv[1] - temp time or user@host
  93  *   parv[2] - user@host, "ON", or reason
  94  *   parv[3] - "ON", reason, or server to target
  95  *   parv[4] - server to target, or reason
  96  *   parv[5] - reason
  97  */
  98 static int
  99 mo_kline(struct Client *client_p, struct Client *source_p,
 100          int parc, const char **parv)
 101 {
 102         char def[] = "No Reason";
 103         char user[USERLEN + 2];
 104         char host[HOSTLEN + 2];
 105         char buffer[IRCD_BUFSIZE];
 106         char *reason = def;
 107         char *oper_reason;
 108         const char *current_date;
 109         const char *target_server = NULL;
 110         struct ConfItem *aconf;
 111         int tkline_time = 0;
 112         int loc = 1;
 113
 114         if(!IsOperK(source_p))
 115         {
 116                 sendto_one(source_p, form_str(ERR_NOPRIVS),
 117                            me.name, source_p->name, "kline");
 118                 return 0;
 119         }
 120
 121         if((tkline_time = valid_temp_time(parv[loc])) >= 0)
 122                 loc++;
 123         /* we just set tkline_time to -1! */
 124         else
 125                 tkline_time = 0;
 126
 127         if(find_user_host(source_p, parv[loc], user, host) == 0)
 128                 return 0;
 129
 130         loc++;
 131
 132         if(parc >= loc+2 && !irccmp(parv[loc], "ON"))
 133         {
 134                 if(!IsOperRemoteBan(source_p))
 135                 {
 136                         sendto_one(source_p, form_str(ERR_NOPRIVS),
 137                                 me.name, source_p->name, "remoteban");
 138                         return 0;
 139                 }
 140
 141                 target_server = parv[loc+1];
 142                 loc += 2;
 143         }
 144
 145         if(parc <= loc || EmptyString(parv[loc]))
 146         {
 147                 sendto_one(source_p, form_str(ERR_NEEDMOREPARAMS),
 148                            me.name, source_p->name, "KLINE");
 149                 return 0;
 150         }
 151
 152         reason = LOCAL_COPY(parv[loc]);
 153
 154         if(target_server != NULL)
 155         {
 156                 propagate_generic(source_p, "KLINE", target_server, CAP_KLN,
 157                                 "%d %s %s :%s",
 158                                 tkline_time, user, host, reason);
 159
 160                 /* If we are sending it somewhere that doesnt include us, stop */
 161                 if(!match(target_server, me.name))
 162                         return 0;
 163         }
 164         /* if we have cluster servers, send it to them.. */
 165         else if(dlink_list_length(&cluster_conf_list) > 0)
 166                 cluster_generic(source_p, "KLINE",
 167                                 (tkline_time > 0) ? SHARED_TKLINE : SHARED_PKLINE, CAP_KLN,
 168                                 "%lu %s %s :%s",
 169                                 tkline_time, user, host, reason);
 170
 171         if(!valid_user_host(source_p, user, host) ||
 172            !valid_wild_card(source_p, user, host) ||
 173            !valid_comment(source_p, reason))
 174                 return 0;
 175
 176         if(already_placed_kline(source_p, user, host, tkline_time))
 177                 return 0;
 178
 179         set_time();
 180         current_date = smalldate();
 181         aconf = make_conf();
 182         aconf->status = CONF_KILL;
 183         DupString(aconf->host, host);
 184         DupString(aconf->user, user);
 185         aconf->port = 0;
 186
 187         /* Look for an oper reason */
 188         if((oper_reason = strchr(reason, '|')) != NULL)
 189         {
 190                 *oper_reason = '\0';
 191                 oper_reason++;
 192
 193                 if(!EmptyString(oper_reason))
 194                         DupString(aconf->spasswd, oper_reason);
 195         }
 196
 197         if(tkline_time > 0)
 198         {
 199                 ircsnprintf(buffer, sizeof(buffer),
 200                            "Temporary K-line %d min. - %s (%s)",
 201                            (int) (tkline_time / 60), reason, current_date);
 202                 DupString(aconf->passwd, buffer);
 203                 apply_tkline(source_p, aconf, reason, oper_reason, current_date, tkline_time);
 204         }
 205         else
 206         {
 207                 ircsnprintf(buffer, sizeof(buffer), "%s (%s)", reason, current_date);
 208                 DupString(aconf->passwd, buffer);
 209                 apply_kline(source_p, aconf, reason, oper_reason, current_date);
 210         }
 211
 212         if(ConfigFileEntry.kline_delay)
 213         {
 214                 if(kline_queued == 0)
 215                 {
 216                         eventAddOnce("check_klines", check_klines_event, NULL,
 217                                      ConfigFileEntry.kline_delay);
 218                         kline_queued = 1;
 219                 }
 220         }
 221         else
 222                 check_klines();
 223
 224         return 0;
 225 }
 226
 227 /* ms_kline()
 228  *
 229  *   parv[1] - server targeted at
 230  *   parv[2] - tkline time (0 if perm)
 231  *   parv[3] - user
 232  *   parv[4] - host
 233  *   parv[5] - reason
 234  */
 235 static int
 236 ms_kline(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
 237 {
 238         int tkline_time = atoi(parv[2]);
 239
 240         /* 1.5-3 and earlier contains a bug that allows remote klines to be
 241          * sent with an empty reason field.  This is a protocol violation,
 242          * but its not worth dropping the link over.. --anfl
 243          */
 244         if(parc < 6 || EmptyString(parv[5]))
 245                 return 0;
 246
 247         propagate_generic(source_p, "KLINE", parv[1], CAP_KLN,
 248                         "%d %s %s :%s",
 249                         tkline_time, parv[3], parv[4], parv[5]);
 250
 251         if(!match(parv[1], me.name))
 252                 return 0;
 253
 254         if(!IsPerson(source_p))
 255                 return 0;
 256
 257         handle_remote_kline(source_p, tkline_time, parv[3], parv[4], parv[5]);
 258         return 0;
 259 }
 260
 261 static int
 262 me_kline(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
 263 {
 264         /* <tkline_time> <user> <host> :<reason> */
 265         if(!IsPerson(source_p))
 266                 return 0;
 267
 268         handle_remote_kline(source_p, atoi(parv[1]), parv[2], parv[3], parv[4]);
 269         return 0;
 270 }
 271
 272 static void
 273 handle_remote_kline(struct Client *source_p, int tkline_time,
 274                 const char *user, const char *host, const char *kreason)
 275 {
 276         char buffer[BUFSIZE];
 277         const char *current_date;
 278         char *reason = LOCAL_COPY(kreason);
 279         struct ConfItem *aconf = NULL;
 280         char *oper_reason;
 281
 282         if(!find_shared_conf(source_p->username, source_p->host,
 283                                 source_p->user->server,
 284                                 (tkline_time > 0) ? SHARED_TKLINE : SHARED_PKLINE))
 285                 return;
 286
 287         if(!valid_user_host(source_p, user, host) ||
 288            !valid_wild_card(source_p, user, host) ||
 289            !valid_comment(source_p, reason))
 290                 return;
 291
 292         if(already_placed_kline(source_p, user, host, tkline_time))
 293                 return;
 294
 295         aconf = make_conf();
 296
 297         aconf->status = CONF_KILL;
 298         DupString(aconf->user, user);
 299         DupString(aconf->host, host);
 300
 301         /* Look for an oper reason */
 302         if((oper_reason = strchr(reason, '|')) != NULL)
 303         {
 304                 *oper_reason = '\0';
 305                 oper_reason++;
 306
 307                 if(!EmptyString(oper_reason))
 308                         DupString(aconf->spasswd, oper_reason);
 309         }
 310
 311         current_date = smalldate();
 312
 313         if(tkline_time > 0)
 314         {
 315                 ircsnprintf(buffer, sizeof(buffer),
 316                            "Temporary K-line %d min. - %s (%s)",
 317                            (int) (tkline_time / 60), reason, current_date);
 318                 DupString(aconf->passwd, buffer);
 319                 apply_tkline(source_p, aconf, reason, oper_reason, current_date, tkline_time);
 320         }
 321         else
 322         {
 323                 ircsnprintf(buffer, sizeof(buffer), "%s (%s)", reason, current_date);
 324                 DupString(aconf->passwd, buffer);
 325                 apply_kline(source_p, aconf, reason, oper_reason, current_date);
 326         }
 327
 328         if(ConfigFileEntry.kline_delay)
 329         {
 330                 if(kline_queued == 0)
 331                 {
 332                         eventAddOnce("check_klines", check_klines_event, NULL,
 333                                      ConfigFileEntry.kline_delay);
 334                         kline_queued = 1;
 335                 }
 336         }
 337         else
 338                 check_klines();
 339
 340         return;
 341 }
 342
 343 /* mo_unkline()
 344  *
 345  *   parv[1] - kline to remove
 346  *   parv[2] - optional "ON"
 347  *   parv[3] - optional target server
 348  */
 349 static int
 350 mo_unkline(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
 351 {
 352         const char *user;
 353         char *host;
 354         char splat[] = "*";
 355         char *h = LOCAL_COPY(parv[1]);
 356
 357         if(!IsOperUnkline(source_p))
 358         {
 359                 sendto_one(source_p, form_str(ERR_NOPRIVS),
 360                            me.name, source_p->name, "unkline");
 361                 return 0;
 362         }
 363
 364         if((host = strchr(h, '@')) || *h == '*' || strchr(h, '.') || strchr(h, ':'))
 365         {
 366                 /* Explicit user@host mask given */
 367
 368                 if(host)        /* Found user@host */
 369                 {
 370                         *host++ = '\0';
 371
 372                         /* check for @host */
 373                         if(*h)
 374                                 user = h;
 375                         else
 376                                 user = splat;
 377
 378                         /* check for user@ */
 379                         if(!*host)
 380                                 host = splat;
 381                 }
 382                 else
 383                 {
 384                         user = splat;   /* no @ found, assume its *@somehost */
 385                         host = h;
 386                 }
 387         }
 388         else
 389         {
 390                 sendto_one(source_p, ":%s NOTICE %s :Invalid parameters", me.name, source_p->name);
 391                 return 0;
 392         }
 393
 394         /* possible remote kline.. */
 395         if((parc > 3) && (irccmp(parv[2], "ON") == 0))
 396         {
 397                 if(!IsOperRemoteBan(source_p))
 398                 {
 399                         sendto_one(source_p, form_str(ERR_NOPRIVS),
 400                                 me.name, source_p->name, "remoteban");
 401                         return 0;
 402                 }
 403
 404                 propagate_generic(source_p, "UNKLINE", parv[3], CAP_UNKLN,
 405                                 "%s %s", user, host);
 406
 407                 if(match(parv[3], me.name) == 0)
 408                         return 0;
 409         }
 410         else if(dlink_list_length(&cluster_conf_list) > 0)
 411                 cluster_generic(source_p, "UNKLINE", SHARED_UNKLINE, CAP_UNKLN,
 412                                 "%s %s", user, host);
 413
 414         if(remove_temp_kline(user, host))
 415         {
 416                 sendto_one(source_p,
 417                            ":%s NOTICE %s :Un-klined [%s@%s] from temporary k-lines",
 418                            me.name, parv[0], user, host);
 419                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 420                                      "%s has removed the temporary K-Line for: [%s@%s]",
 421                                      get_oper_name(source_p), user, host);
 422                 ilog(L_KLINE, "UK %s %s %s",
 423                         get_oper_name(source_p), user, host);
 424                 return 0;
 425         }
 426
 427         remove_permkline_match(source_p, host, user);
 428
 429         return 0;
 430 }
 431
 432 /* ms_unkline()
 433  *
 434  *   parv[1] - target server
 435  *   parv[2] - user to unkline
 436  *   parv[3] - host to unkline
 437  */
 438 static int
 439 ms_unkline(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
 440 {
 441         /* parv[0]  parv[1]        parv[2]  parv[3]
 442          * oper     target server  user     host    */
 443         propagate_generic(source_p, "UNKLINE", parv[1], CAP_UNKLN,
 444                         "%s %s", parv[2], parv[3]);
 445
 446         if(!match(parv[1], me.name))
 447                 return 0;
 448
 449         if(!IsPerson(source_p))
 450                 return 0;
 451
 452         handle_remote_unkline(source_p, parv[2], parv[3]);
 453         return 0;
 454 }
 455
 456 static int
 457 me_unkline(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
 458 {
 459         /* user host */
 460         if(!IsPerson(source_p))
 461                 return 0;
 462
 463         handle_remote_unkline(source_p, parv[1], parv[2]);
 464         return 0;
 465 }
 466
 467 static void
 468 handle_remote_unkline(struct Client *source_p, const char *user, const char *host)
 469 {
 470         if(!find_shared_conf(source_p->username, source_p->host,
 471                                 source_p->user->server, SHARED_UNKLINE))
 472                 return;
 473
 474         if(remove_temp_kline(user, host))
 475         {
 476                 sendto_one_notice(source_p,
 477                                 ":Un-klined [%s@%s] from temporary k-lines",
 478                                 user, host);
 479
 480                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 481                                 "%s has removed the temporary K-Line for: [%s@%s]",
 482                                 get_oper_name(source_p), user, host);
 483
 484                 ilog(L_KLINE, "UK %s %s %s",
 485                         get_oper_name(source_p), user, host);
 486                 return;
 487         }
 488
 489         remove_permkline_match(source_p, host, user);
 490 }
 491
 492 /* apply_kline()
 493  *
 494  * inputs       -
 495  * output       - NONE
 496  * side effects - kline as given, is added to the hashtable
 497  *                and conf file
 498  */
 499 static void
 500 apply_kline(struct Client *source_p, struct ConfItem *aconf,
 501             const char *reason, const char *oper_reason, const char *current_date)
 502 {
 503         add_conf_by_address(aconf->host, CONF_KILL, aconf->user, aconf);
 504         write_confitem(KLINE_TYPE, source_p, aconf->user, aconf->host,
 505                        reason, oper_reason, current_date, 0);
 506 }
 507
 508 /* apply_tkline()
 509  *
 510  * inputs       -
 511  * output       - NONE
 512  * side effects - tkline as given is placed
 513  */
 514 static void
 515 apply_tkline(struct Client *source_p, struct ConfItem *aconf,
 516              const char *reason, const char *oper_reason, const char *current_date, int tkline_time)
 517 {
 518         aconf->hold = CurrentTime + tkline_time;
 519         add_temp_kline(aconf);
 520
 521         /* no oper reason.. */
 522         if(EmptyString(oper_reason))
 523         {
 524                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 525                                      "%s added temporary %d min. K-Line for [%s@%s] [%s]",
 526                                      get_oper_name(source_p), tkline_time / 60,
 527                                      aconf->user, aconf->host, reason);
 528                 ilog(L_KLINE, "K %s %d %s %s %s",
 529                         get_oper_name(source_p), tkline_time / 60,
 530                         aconf->user, aconf->host, reason);
 531         }
 532         else
 533         {
 534                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 535                                      "%s added temporary %d min. K-Line for [%s@%s] [%s|%s]",
 536                                      get_oper_name(source_p), tkline_time / 60,
 537                                      aconf->user, aconf->host, reason, oper_reason);
 538                 ilog(L_KLINE, "K %s %d %s %s %s|%s",
 539                         get_oper_name(source_p), tkline_time / 60,
 540                         aconf->user, aconf->host, reason, oper_reason);
 541         }
 542
 543         sendto_one_notice(source_p, ":Added temporary %d min. K-Line [%s@%s]",
 544                           tkline_time / 60, aconf->user, aconf->host);
 545 }
 546
 547 /* find_user_host()
 548  *
 549  * inputs       - client placing kline, user@host, user buffer, host buffer
 550  * output       - 0 if not ok to kline, 1 to kline i.e. if valid user host
 551  * side effects -
 552  */
 553 static int
 554 find_user_host(struct Client *source_p, const char *userhost, char *luser, char *lhost)
 555 {
 556         char *hostp;
 557
 558         hostp = strchr(userhost, '@');
 559
 560         if(hostp != NULL)       /* I'm a little user@host */
 561         {
 562                 *(hostp++) = '\0';      /* short and squat */
 563                 if(*userhost)
 564                         strlcpy(luser, userhost, USERLEN + 1);  /* here is my user */
 565                 else
 566                         strcpy(luser, "*");
 567                 if(*hostp)
 568                         strlcpy(lhost, hostp, HOSTLEN + 1);     /* here is my host */
 569                 else
 570                         strcpy(lhost, "*");
 571                 }
 572         else
 573         {
 574                 /* no '@', no '.', so its not a user@host or host, therefore
 575                  * its a nick, which support was removed for.
 576                  */
 577                 if(strchr(userhost, '.') == NULL && strchr(userhost, ':') == NULL)
 578                         return 0;
 579
 580                 luser[0] = '*'; /* no @ found, assume its *@somehost */
 581                 luser[1] = '\0';
 582                 strlcpy(lhost, userhost, HOSTLEN + 1);
 583         }
 584
 585         return 1;
 586 }
 587
 588 /* valid_user_host()
 589  *
 590  * inputs       - user buffer, host buffer
 591  * output       - 0 if invalid, 1 if valid
 592  * side effects -
 593  */
 594 static int
 595 valid_user_host(struct Client *source_p, const char *luser, const char *lhost)
 596 {
 597         /* # is invalid, as is '!' (n!u@h kline) */
 598         if(strchr(lhost, '#') || strchr(luser, '#') || strchr(luser, '!'))
 599         {
 600                 sendto_one_notice(source_p, ":Invalid K-Line");
 601                 return 0;
 602         }
 603
 604         return 1;
 605 }
 606
 607 /* valid_wild_card()
 608  *
 609  * input        - user buffer, host buffer
 610  * output       - 0 if invalid, 1 if valid
 611  * side effects -
 612  */
 613 static int
 614 valid_wild_card(struct Client *source_p, const char *luser, const char *lhost)
 615 {
 616         const char *p;
 617         char tmpch;
 618         int nonwild = 0;
 619
 620         /* check there are enough non wildcard chars */
 621         p = luser;
 622         while ((tmpch = *p++))
 623         {
 624                 if(!IsKWildChar(tmpch))
 625                 {
 626                         /* found enough chars, return */
 627                         if(++nonwild >= ConfigFileEntry.min_nonwildcard)
 628                                 return 1;
 629                 }
 630         }
 631
 632         /* try host, as user didnt contain enough */
 633         p = lhost;
 634         while ((tmpch = *p++))
 635         {
 636                 if(!IsKWildChar(tmpch))
 637                         if(++nonwild >= ConfigFileEntry.min_nonwildcard)
 638                                 return 1;
 639         }
 640
 641         sendto_one_notice(source_p,
 642                           ":Please include at least %d non-wildcard "
 643                           "characters with the user@host",
 644                           ConfigFileEntry.min_nonwildcard);
 645         return 0;
 646 }
 647
 648 /*
 649  * valid_comment
 650  * inputs       - pointer to client
 651  *              - pointer to comment
 652  * output       - 0 if no valid comment, 1 if valid
 653  * side effects - NONE
 654  */
 655 static int
 656 valid_comment(struct Client *source_p, char *comment)
 657 {
 658         if(strchr(comment, '"'))
 659         {
 660                 sendto_one_notice(source_p, ":Invalid character '\"' in comment");
 661                 return 0;
 662         }
 663
 664         if(strlen(comment) > REASONLEN)
 665                 comment[REASONLEN] = '\0';
 666
 667         return 1;
 668 }
 669
 670 /* already_placed_kline()
 671  *
 672  * inputs       - source to notify, user@host to check, tkline time
 673  * outputs      - 1 if a perm kline or a tkline when a tkline is being
 674  *                set exists, else 0
 675  * side effects - notifies source_p kline exists
 676  */
 677 /* Note: This currently works if the new K-line is a special case of an
 678  *       existing K-line, but not the other way round. To do that we would
 679  *       have to walk the hash and check every existing K-line. -A1kmm.
 680  */
 681 static int
 682 already_placed_kline(struct Client *source_p, const char *luser, const char *lhost, int tkline)
 683 {
 684         const char *reason;
 685         struct irc_sockaddr_storage iphost, *piphost;
 686         struct ConfItem *aconf;
 687         int t;
 688         if(ConfigFileEntry.non_redundant_klines)
 689         {
 690                 if((t = parse_netmask(lhost, (struct sockaddr *)&iphost, NULL)) != HM_HOST)
 691                 {
 692 #ifdef IPV6
 693                         if(t == HM_IPV6)
 694                                 t = AF_INET6;
 695                         else
 696 #endif
 697                                 t = AF_INET;
 698
 699                         piphost = &iphost;
 700                 }
 701                 else
 702                         piphost = NULL;
 703
 704                 if((aconf = find_conf_by_address(lhost, NULL, NULL, (struct sockaddr *)piphost, CONF_KILL, t, luser)))
 705                 {
 706                         /* setting a tkline, or existing one is perm */
 707                         if(tkline || ((aconf->flags & CONF_FLAGS_TEMPORARY) == 0))
 708                         {
 709                                 reason = aconf->passwd ? aconf->passwd : "<No Reason>";
 710
 711                                 sendto_one_notice(source_p,
 712                                                   ":[%s@%s] already K-Lined by [%s@%s] - %s",
 713                                                   luser, lhost, aconf->user,
 714                                                   aconf->host, reason);
 715                                 return 1;
 716                         }
 717                 }
 718         }
 719
 720         return 0;
 721 }
 722
 723 /* remove_permkline_match()
 724  *
 725  * hunts for a permanent kline, and removes it.
 726  */
 727 static void
 728 remove_permkline_match(struct Client *source_p, const char *host, const char *user)
 729 {
 730         FILE *in, *out;
 731         int pairme = 0;
 732         int error_on_write = NO;
 733         char buf[BUFSIZE];
 734         char matchbuf[BUFSIZE];
 735         char temppath[BUFSIZE];
 736         const char *filename;
 737         mode_t oldumask;
 738         int matchlen;
 739
 740         ircsnprintf(temppath, sizeof(temppath),
 741                  "%s.tmp", ConfigFileEntry.klinefile);
 742
 743         filename = get_conf_name(KLINE_TYPE);
 744
 745         if((in = fopen(filename, "r")) == 0)
 746         {
 747                 sendto_one_notice(source_p, ":Cannot open %s", filename);
 748                 return;
 749         }
 750
 751         oldumask = umask(0);
 752         if((out = fopen(temppath, "w")) == 0)
 753         {
 754                 sendto_one_notice(source_p, ":Cannot open %s", temppath);
 755                 fclose(in);
 756                 umask(oldumask);
 757                 return;
 758         }
 759
 760         umask(oldumask);
 761
 762         snprintf(matchbuf, sizeof(matchbuf), "\"%s\",\"%s\"", user, host);
 763         matchlen = strlen(matchbuf);
 764
 765         while (fgets(buf, sizeof(buf), in))
 766         {
 767                 if(error_on_write)
 768                         break;
 769
 770                 if(!strncasecmp(buf, matchbuf, matchlen))
 771                 {
 772                         pairme++;
 773                         break;
 774                 }
 775                 else
 776                         error_on_write = flush_write(source_p, out, buf, temppath);
 777         }
 778
 779         /* we dropped out of the loop early because we found a match,
 780          * to drop into this somewhat faster loop as we presume we'll never
 781          * have two matching klines --anfl
 782          */
 783         if(pairme && !error_on_write)
 784         {
 785                 while(fgets(buf, sizeof(buf), in))
 786                 {
 787                         if(error_on_write)
 788                                 break;
 789
 790                         error_on_write = flush_write(source_p, out, buf, temppath);
 791                 }
 792         }
 793
 794         fclose(in);
 795         if (fclose(out))
 796                 error_on_write = YES;
 797
 798         /* The result of the rename should be checked too... oh well */
 799         /* If there was an error on a write above, then its been reported
 800          * and I am not going to trash the original kline /conf file
 801          */
 802         if(error_on_write)
 803         {
 804                 sendto_one_notice(source_p, ":Couldn't write temp kline file, aborted");
 805                 return;
 806         }
 807         else if(!pairme)
 808         {
 809                 sendto_one_notice(source_p, ":No K-Line for %s@%s",
 810                                   user, host);
 811
 812                 if(temppath != NULL)
 813                         (void) unlink(temppath);
 814
 815                 return;
 816         }
 817
 818         if (rename(temppath, filename))
 819         {
 820                 sendto_one_notice(source_p, ":Couldn't rename temp file, aborted");
 821                 return;
 822         }
 823         rehash_bans(0);
 824
 825         sendto_one_notice(source_p, ":K-Line for [%s@%s] is removed",
 826                           user, host);
 827
 828         sendto_realops_snomask(SNO_GENERAL, L_ALL,
 829                              "%s has removed the K-Line for: [%s@%s]",
 830                              get_oper_name(source_p), user, host);
 831
 832         ilog(L_KLINE, "UK %s %s %s",
 833                 get_oper_name(source_p), user, host);
 834         return;
 835 }
 836
 837 /*
 838  * flush_write()
 839  *
 840  * inputs       - pointer to client structure of oper requesting unkline
 841  *              - out is the file descriptor
 842  *              - buf is the buffer to write
 843  *              - ntowrite is the expected number of character to be written
 844  *              - temppath is the temporary file name to be written
 845  * output       - YES for error on write
 846  *              - NO for success
 847  * side effects - if successful, the buf is written to output file
 848  *                if a write failure happesn, and the file pointed to
 849  *                by temppath, if its non NULL, is removed.
 850  *
 851  * The idea here is, to be as robust as possible when writing to the
 852  * kline file.
 853  *
 854  * -Dianora
 855  */
 856
 857 static int
 858 flush_write(struct Client *source_p, FILE * out, const char *buf, const char *temppath)
 859 {
 860         int error_on_write = (fputs(buf, out) < 0) ? YES : NO;
 861
 862         if(error_on_write)
 863         {
 864                 sendto_one_notice(source_p, ":Unable to write to %s",
 865                                   temppath);
 866                 if(temppath != NULL)
 867                         (void) unlink(temppath);
 868         }
 869         return (error_on_write);
 870 }
 871
 872 /* remove_temp_kline()
 873  *
 874  * inputs       - username, hostname to unkline
 875  * outputs      -
 876  * side effects - tries to unkline anything that matches
 877  */
 878 static int
 879 remove_temp_kline(const char *user, const char *host)
 880 {
 881         struct ConfItem *aconf;
 882         dlink_node *ptr;
 883         struct irc_sockaddr_storage addr, caddr;
 884         int bits, cbits;
 885         int mtype, ktype;
 886         int i;
 887
 888         mtype = parse_netmask(host, (struct sockaddr *)&addr, &bits);
 889
 890         for (i = 0; i < LAST_TEMP_TYPE; i++)
 891         {
 892                 DLINK_FOREACH(ptr, temp_klines[i].head)
 893                 {
 894                         aconf = ptr->data;
 895
 896                         ktype = parse_netmask(aconf->host, (struct sockaddr *)&caddr, &cbits);
 897
 898                         if(ktype != mtype || (user && irccmp(user, aconf->user)))
 899                                 continue;
 900
 901                         if(ktype == HM_HOST)
 902                         {
 903                                 if(irccmp(aconf->host, host))
 904                                         continue;
 905                         }
 906                         else if(bits != cbits ||
 907                                 !comp_with_mask_sock((struct sockaddr *)&addr,
 908                                                 (struct sockaddr *)&caddr, bits))
 909                                 continue;
 910
 911                         dlinkDestroy(ptr, &temp_klines[i]);
 912                         delete_one_address_conf(aconf->host, aconf);
 913                         return YES;
 914                 }
 915         }
 916
 917         return NO;
 918 }