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 3466 2007-05-19 23:36:51Z 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: 3466 $");
  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 *, struct ConfItem *);
  87 static int flush_write(struct Client *, FILE *, const char *, const char *);
  88 static int remove_temp_kline(struct ConfItem *);
  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->servptr->name,
 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         struct ConfItem *aconf;
 357
 358         if(!IsOperUnkline(source_p))
 359         {
 360                 sendto_one(source_p, form_str(ERR_NOPRIVS),
 361                            me.name, source_p->name, "unkline");
 362                 return 0;
 363         }
 364
 365         if((host = strchr(h, '@')) || *h == '*' || strchr(h, '.') || strchr(h, ':'))
 366         {
 367                 /* Explicit user@host mask given */
 368
 369                 if(host)        /* Found user@host */
 370                 {
 371                         *host++ = '\0';
 372
 373                         /* check for @host */
 374                         if(*h)
 375                                 user = h;
 376                         else
 377                                 user = splat;
 378
 379                         /* check for user@ */
 380                         if(!*host)
 381                                 host = splat;
 382                 }
 383                 else
 384                 {
 385                         user = splat;   /* no @ found, assume its *@somehost */
 386                         host = h;
 387                 }
 388         }
 389         else
 390         {
 391                 sendto_one_notice(source_p, ":Invalid parameters");
 392                 return 0;
 393         }
 394
 395         /* possible remote kline.. */
 396         if((parc > 3) && (irccmp(parv[2], "ON") == 0))
 397         {
 398                 if(!IsOperRemoteBan(source_p))
 399                 {
 400                         sendto_one(source_p, form_str(ERR_NOPRIVS),
 401                                 me.name, source_p->name, "remoteban");
 402                         return 0;
 403                 }
 404
 405                 propagate_generic(source_p, "UNKLINE", parv[3], CAP_UNKLN,
 406                                 "%s %s", user, host);
 407
 408                 if(match(parv[3], me.name) == 0)
 409                         return 0;
 410         }
 411         else if(dlink_list_length(&cluster_conf_list) > 0)
 412                 cluster_generic(source_p, "UNKLINE", SHARED_UNKLINE, CAP_UNKLN,
 413                                 "%s %s", user, host);
 414
 415         aconf = find_exact_conf_by_address(host, CONF_KILL, user);
 416         if(aconf == NULL)
 417         {
 418                 sendto_one_notice(source_p, ":No K-Line for %s@%s", user, host);
 419                 return 0;
 420         }
 421
 422         if(remove_temp_kline(aconf))
 423         {
 424                 sendto_one_notice(source_p, ":Un-klined [%s@%s] from temporary k-lines", user, host);
 425                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 426                                      "%s has removed the temporary K-Line for: [%s@%s]",
 427                                      get_oper_name(source_p), user, host);
 428                 ilog(L_KLINE, "UK %s %s %s",
 429                         get_oper_name(source_p), user, host);
 430                 return 0;
 431         }
 432
 433         remove_permkline_match(source_p, aconf);
 434
 435         return 0;
 436 }
 437
 438 /* ms_unkline()
 439  *
 440  *   parv[1] - target server
 441  *   parv[2] - user to unkline
 442  *   parv[3] - host to unkline
 443  */
 444 static int
 445 ms_unkline(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
 446 {
 447         /* parv[0]  parv[1]        parv[2]  parv[3]
 448          * oper     target server  user     host    */
 449         propagate_generic(source_p, "UNKLINE", parv[1], CAP_UNKLN,
 450                         "%s %s", parv[2], parv[3]);
 451
 452         if(!match(parv[1], me.name))
 453                 return 0;
 454
 455         if(!IsPerson(source_p))
 456                 return 0;
 457
 458         handle_remote_unkline(source_p, parv[2], parv[3]);
 459         return 0;
 460 }
 461
 462 static int
 463 me_unkline(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
 464 {
 465         /* user host */
 466         if(!IsPerson(source_p))
 467                 return 0;
 468
 469         handle_remote_unkline(source_p, parv[1], parv[2]);
 470         return 0;
 471 }
 472
 473 static void
 474 handle_remote_unkline(struct Client *source_p, const char *user, const char *host)
 475 {
 476         struct ConfItem *aconf;
 477
 478         if(!find_shared_conf(source_p->username, source_p->host,
 479                                 source_p->servptr->name, SHARED_UNKLINE))
 480                 return;
 481
 482         aconf = find_exact_conf_by_address(host, CONF_KILL, user);
 483         if(aconf == NULL)
 484         {
 485                 sendto_one_notice(source_p, ":No K-Line for %s@%s", user, host);
 486                 return;
 487         }
 488
 489         if(remove_temp_kline(aconf))
 490         {
 491                 sendto_one_notice(source_p,
 492                                 ":Un-klined [%s@%s] from temporary k-lines",
 493                                 user, host);
 494
 495                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 496                                 "%s has removed the temporary K-Line for: [%s@%s]",
 497                                 get_oper_name(source_p), user, host);
 498
 499                 ilog(L_KLINE, "UK %s %s %s",
 500                         get_oper_name(source_p), user, host);
 501                 return;
 502         }
 503
 504         remove_permkline_match(source_p, aconf);
 505 }
 506
 507 /* apply_kline()
 508  *
 509  * inputs       -
 510  * output       - NONE
 511  * side effects - kline as given, is added to the hashtable
 512  *                and conf file
 513  */
 514 static void
 515 apply_kline(struct Client *source_p, struct ConfItem *aconf,
 516             const char *reason, const char *oper_reason, const char *current_date)
 517 {
 518         add_conf_by_address(aconf->host, CONF_KILL, aconf->user, aconf);
 519         write_confitem(KLINE_TYPE, source_p, aconf->user, aconf->host,
 520                        reason, oper_reason, current_date, 0);
 521 }
 522
 523 /* apply_tkline()
 524  *
 525  * inputs       -
 526  * output       - NONE
 527  * side effects - tkline as given is placed
 528  */
 529 static void
 530 apply_tkline(struct Client *source_p, struct ConfItem *aconf,
 531              const char *reason, const char *oper_reason, const char *current_date, int tkline_time)
 532 {
 533         aconf->hold = CurrentTime + tkline_time;
 534         add_temp_kline(aconf);
 535
 536         /* no oper reason.. */
 537         if(EmptyString(oper_reason))
 538         {
 539                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 540                                      "%s added temporary %d min. K-Line for [%s@%s] [%s]",
 541                                      get_oper_name(source_p), tkline_time / 60,
 542                                      aconf->user, aconf->host, reason);
 543                 ilog(L_KLINE, "K %s %d %s %s %s",
 544                         get_oper_name(source_p), tkline_time / 60,
 545                         aconf->user, aconf->host, reason);
 546         }
 547         else
 548         {
 549                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 550                                      "%s added temporary %d min. K-Line for [%s@%s] [%s|%s]",
 551                                      get_oper_name(source_p), tkline_time / 60,
 552                                      aconf->user, aconf->host, reason, oper_reason);
 553                 ilog(L_KLINE, "K %s %d %s %s %s|%s",
 554                         get_oper_name(source_p), tkline_time / 60,
 555                         aconf->user, aconf->host, reason, oper_reason);
 556         }
 557
 558         sendto_one_notice(source_p, ":Added temporary %d min. K-Line [%s@%s]",
 559                           tkline_time / 60, aconf->user, aconf->host);
 560 }
 561
 562 /* find_user_host()
 563  *
 564  * inputs       - client placing kline, user@host, user buffer, host buffer
 565  * output       - 0 if not ok to kline, 1 to kline i.e. if valid user host
 566  * side effects -
 567  */
 568 static int
 569 find_user_host(struct Client *source_p, const char *userhost, char *luser, char *lhost)
 570 {
 571         char *hostp;
 572
 573         hostp = strchr(userhost, '@');
 574
 575         if(hostp != NULL)       /* I'm a little user@host */
 576         {
 577                 *(hostp++) = '\0';      /* short and squat */
 578                 if(*userhost)
 579                         strlcpy(luser, userhost, USERLEN + 1);  /* here is my user */
 580                 else
 581                         strcpy(luser, "*");
 582                 if(*hostp)
 583                         strlcpy(lhost, hostp, HOSTLEN + 1);     /* here is my host */
 584                 else
 585                         strcpy(lhost, "*");
 586                 }
 587         else
 588         {
 589                 /* no '@', no '.', so its not a user@host or host, therefore
 590                  * its a nick, which support was removed for.
 591                  */
 592                 if(strchr(userhost, '.') == NULL && strchr(userhost, ':') == NULL)
 593                         return 0;
 594
 595                 luser[0] = '*'; /* no @ found, assume its *@somehost */
 596                 luser[1] = '\0';
 597                 strlcpy(lhost, userhost, HOSTLEN + 1);
 598         }
 599
 600         return 1;
 601 }
 602
 603 /* valid_user_host()
 604  *
 605  * inputs       - user buffer, host buffer
 606  * output       - 0 if invalid, 1 if valid
 607  * side effects -
 608  */
 609 static int
 610 valid_user_host(struct Client *source_p, const char *luser, const char *lhost)
 611 {
 612         /* # is invalid, as is '!' (n!u@h kline) */
 613         if(strchr(lhost, '#') || strchr(luser, '#') || strchr(luser, '!'))
 614         {
 615                 sendto_one_notice(source_p, ":Invalid K-Line");
 616                 return 0;
 617         }
 618
 619         return 1;
 620 }
 621
 622 /* valid_wild_card()
 623  *
 624  * input        - user buffer, host buffer
 625  * output       - 0 if invalid, 1 if valid
 626  * side effects -
 627  */
 628 static int
 629 valid_wild_card(struct Client *source_p, const char *luser, const char *lhost)
 630 {
 631         const char *p;
 632         char tmpch;
 633         int nonwild = 0;
 634         int bitlen;
 635
 636         /* user has no wildcards, always accept -- jilles */
 637         if (!strchr(luser, '?') && !strchr(luser, '*'))
 638                 return 1;
 639
 640         /* check there are enough non wildcard chars */
 641         p = luser;
 642         while ((tmpch = *p++))
 643         {
 644                 if(!IsKWildChar(tmpch))
 645                 {
 646                         /* found enough chars, return */
 647                         if(++nonwild >= ConfigFileEntry.min_nonwildcard)
 648                                 return 1;
 649                 }
 650         }
 651
 652         /* try host, as user didnt contain enough */
 653         /* special case for cidr masks -- jilles */
 654         if ((p = strrchr(lhost, '/')) != NULL && IsDigit(p[1]))
 655         {
 656                 bitlen = atoi(p + 1);
 657                 /* much like non-cidr for ipv6, rather arbitrary for ipv4 */
 658                 if (bitlen > 0 && bitlen >= (strchr(lhost, ':') ? 4 * (ConfigFileEntry.min_nonwildcard - nonwild) : 6 - 2 * nonwild))
 659                         return 1;
 660         }
 661         else
 662         {
 663                 p = lhost;
 664                 while ((tmpch = *p++))
 665                 {
 666                         if(!IsKWildChar(tmpch))
 667                                 if(++nonwild >= ConfigFileEntry.min_nonwildcard)
 668                                         return 1;
 669                 }
 670         }
 671
 672         sendto_one_notice(source_p,
 673                           ":Please include at least %d non-wildcard "
 674                           "characters with the user@host",
 675                           ConfigFileEntry.min_nonwildcard);
 676         return 0;
 677 }
 678
 679 /*
 680  * valid_comment
 681  * inputs       - pointer to client
 682  *              - pointer to comment
 683  * output       - 0 if no valid comment, 1 if valid
 684  * side effects - NONE
 685  */
 686 static int
 687 valid_comment(struct Client *source_p, char *comment)
 688 {
 689         if(strchr(comment, '"'))
 690         {
 691                 sendto_one_notice(source_p, ":Invalid character '\"' in comment");
 692                 return 0;
 693         }
 694
 695         if(strlen(comment) > BANREASONLEN)
 696                 comment[BANREASONLEN] = '\0';
 697
 698         return 1;
 699 }
 700
 701 /* already_placed_kline()
 702  *
 703  * inputs       - source to notify, user@host to check, tkline time
 704  * outputs      - 1 if a perm kline or a tkline when a tkline is being
 705  *                set exists, else 0
 706  * side effects - notifies source_p kline exists
 707  */
 708 /* Note: This currently works if the new K-line is a special case of an
 709  *       existing K-line, but not the other way round. To do that we would
 710  *       have to walk the hash and check every existing K-line. -A1kmm.
 711  */
 712 static int
 713 already_placed_kline(struct Client *source_p, const char *luser, const char *lhost, int tkline)
 714 {
 715         const char *reason;
 716         struct irc_sockaddr_storage iphost, *piphost;
 717         struct ConfItem *aconf;
 718         int t;
 719         if(ConfigFileEntry.non_redundant_klines)
 720         {
 721                 if((t = parse_netmask(lhost, (struct sockaddr *)&iphost, NULL)) != HM_HOST)
 722                 {
 723 #ifdef IPV6
 724                         if(t == HM_IPV6)
 725                                 t = AF_INET6;
 726                         else
 727 #endif
 728                                 t = AF_INET;
 729
 730                         piphost = &iphost;
 731                 }
 732                 else
 733                         piphost = NULL;
 734
 735                 if((aconf = find_conf_by_address(lhost, NULL, NULL, (struct sockaddr *)piphost, CONF_KILL, t, luser)))
 736                 {
 737                         /* setting a tkline, or existing one is perm */
 738                         if(tkline || ((aconf->flags & CONF_FLAGS_TEMPORARY) == 0))
 739                         {
 740                                 reason = aconf->passwd ? aconf->passwd : "<No Reason>";
 741
 742                                 sendto_one_notice(source_p,
 743                                                   ":[%s@%s] already K-Lined by [%s@%s] - %s",
 744                                                   luser, lhost, aconf->user,
 745                                                   aconf->host, reason);
 746                                 return 1;
 747                         }
 748                 }
 749         }
 750
 751         return 0;
 752 }
 753
 754 /* remove_permkline_match()
 755  *
 756  * hunts for a permanent kline, and removes it.
 757  */
 758 static void
 759 remove_permkline_match(struct Client *source_p, struct ConfItem *aconf)
 760 {
 761         FILE *in, *out;
 762         int pairme = 0;
 763         int error_on_write = NO;
 764         char buf[BUFSIZE];
 765         char matchbuf[BUFSIZE];
 766         char temppath[BUFSIZE];
 767         const char *filename;
 768         const char *host, *user;
 769         mode_t oldumask;
 770         int matchlen;
 771
 772         host = aconf->host;
 773         user = aconf->user;
 774
 775         ircsnprintf(temppath, sizeof(temppath),
 776                  "%s.tmp", ConfigFileEntry.klinefile);
 777
 778         filename = get_conf_name(KLINE_TYPE);
 779
 780         if((in = fopen(filename, "r")) == 0)
 781         {
 782                 sendto_one_notice(source_p, ":Cannot open %s", filename);
 783                 return;
 784         }
 785
 786         oldumask = umask(0);
 787         if((out = fopen(temppath, "w")) == 0)
 788         {
 789                 sendto_one_notice(source_p, ":Cannot open %s", temppath);
 790                 fclose(in);
 791                 umask(oldumask);
 792                 return;
 793         }
 794
 795         umask(oldumask);
 796
 797         snprintf(matchbuf, sizeof(matchbuf), "\"%s\",\"%s\"", user, host);
 798         matchlen = strlen(matchbuf);
 799
 800         while (fgets(buf, sizeof(buf), in))
 801         {
 802                 if(error_on_write)
 803                         break;
 804
 805                 if(!strncasecmp(buf, matchbuf, matchlen))
 806                 {
 807                         pairme++;
 808                         break;
 809                 }
 810                 else
 811                         error_on_write = flush_write(source_p, out, buf, temppath);
 812         }
 813
 814         /* we dropped out of the loop early because we found a match,
 815          * to drop into this somewhat faster loop as we presume we'll never
 816          * have two matching klines --anfl
 817          */
 818         if(pairme && !error_on_write)
 819         {
 820                 while(fgets(buf, sizeof(buf), in))
 821                 {
 822                         if(error_on_write)
 823                                 break;
 824
 825                         error_on_write = flush_write(source_p, out, buf, temppath);
 826                 }
 827         }
 828
 829         fclose(in);
 830         if (fclose(out))
 831                 error_on_write = YES;
 832
 833         /* The result of the rename should be checked too... oh well */
 834         /* If there was an error on a write above, then its been reported
 835          * and I am not going to trash the original kline /conf file
 836          */
 837         if(error_on_write)
 838         {
 839                 sendto_one_notice(source_p, ":Couldn't write temp kline file, aborted");
 840                 return;
 841         }
 842         else if(!pairme)
 843         {
 844                 sendto_one_notice(source_p, ":Cannot find K-Line for %s@%s in file",
 845                                   user, host);
 846
 847                 if(temppath != NULL)
 848                         (void) unlink(temppath);
 849
 850                 return;
 851         }
 852
 853         if (rename(temppath, filename))
 854         {
 855                 sendto_one_notice(source_p, ":Couldn't rename temp file, aborted");
 856                 return;
 857         }
 858
 859         sendto_one_notice(source_p, ":K-Line for [%s@%s] is removed",
 860                           user, host);
 861
 862         sendto_realops_snomask(SNO_GENERAL, L_ALL,
 863                              "%s has removed the K-Line for: [%s@%s]",
 864                              get_oper_name(source_p), user, host);
 865
 866         ilog(L_KLINE, "UK %s %s %s",
 867                 get_oper_name(source_p), user, host);
 868
 869         delete_one_address_conf(aconf->host, aconf);
 870
 871         return;
 872 }
 873
 874 /*
 875  * flush_write()
 876  *
 877  * inputs       - pointer to client structure of oper requesting unkline
 878  *              - out is the file descriptor
 879  *              - buf is the buffer to write
 880  *              - ntowrite is the expected number of character to be written
 881  *              - temppath is the temporary file name to be written
 882  * output       - YES for error on write
 883  *              - NO for success
 884  * side effects - if successful, the buf is written to output file
 885  *                if a write failure happesn, and the file pointed to
 886  *                by temppath, if its non NULL, is removed.
 887  *
 888  * The idea here is, to be as robust as possible when writing to the
 889  * kline file.
 890  *
 891  * -Dianora
 892  */
 893
 894 static int
 895 flush_write(struct Client *source_p, FILE * out, const char *buf, const char *temppath)
 896 {
 897         int error_on_write = (fputs(buf, out) < 0) ? YES : NO;
 898
 899         if(error_on_write)
 900         {
 901                 sendto_one_notice(source_p, ":Unable to write to %s",
 902                                   temppath);
 903                 if(temppath != NULL)
 904                         (void) unlink(temppath);
 905         }
 906         return (error_on_write);
 907 }
 908
 909 /* remove_temp_kline()
 910  *
 911  * inputs       - username, hostname to unkline
 912  * outputs      -
 913  * side effects - tries to unkline anything that matches
 914  */
 915 static int
 916 remove_temp_kline(struct ConfItem *aconf)
 917 {
 918         dlink_node *ptr;
 919         int i;
 920
 921         for (i = 0; i < LAST_TEMP_TYPE; i++)
 922         {
 923                 DLINK_FOREACH(ptr, temp_klines[i].head)
 924                 {
 925                         if (aconf == ptr->data)
 926                         {
 927                                 dlinkDestroy(ptr, &temp_klines[i]);
 928                                 delete_one_address_conf(aconf->host, aconf);
 929                                 return YES;
 930                         }
 931                 }
 932         }
 933
 934         return NO;
 935 }